1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2024 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * In /etc/resolv.conf and the RES_OPTIONS, option flags can now be
13 prefixed with “-” to clear previously set flags. For example, if
14 /etc/resolv.conf contains “options no-aaaa”, a process running with
15 the RES_OPTIONS=-no-aaaa environment variable performs AAAA DNS
16 queries when the glibc DNS stub resolver is used.
18 * The DNS stub resolver now supports the strict-error option. If
19 activated, getaddrinfo for the AF_UNSPEC address family (with dual
20 A/AAAA DNS lookups) attemps to obtain an A/AAAA response pair from
21 another DNS server if one of the responses indicates failure. Without
22 the strict-error option, getaddrinfo returns the A record data it has
23 obtained even if the AAAA query failed. The new strict error mode is
24 incompatible with some DNS environments which do not follow the RFCs,
25 which is why this mode is not enabled by default. A future version
26 of the library may turn it on by default, however.
28 * On Linux, the sched_setattr and sched_getattr have been added, for
29 supporting parameterized scheduling policies such as SCHED_DEADLINE.
31 Deprecated and removed features, and other changes affecting compatibility:
33 [Add deprecations, removals and changes affecting compatibility here]
35 Changes to build and runtime requirements:
37 [Add changes to build and runtime requirements here]
39 Security related changes:
41 The following CVEs were fixed in this release, details of which can be
42 found in the advisories directory of the release tarball:
44 [The release manager will add the list generated by
45 scripts/process-advisories.sh just before the release.]
47 The following bugs were resolved with this release:
49 [The release manager will add the list generated by
50 scripts/list-fixed-bugs.py just before the release.]
56 * The <stdbit.h> header type-generic macros have been changed when using
57 GCC 14.1 or later to use __builtin_stdc_bit_ceil etc. built-in functions
58 in order to support unsigned __int128 and/or unsigned _BitInt(N) operands
59 with arbitrary precisions when supported by the target.
61 * The GNU C Library now supports a feature test macro _ISOC23_SOURCE to
62 enable features from the ISO C23 standard. Only some features from
63 this standard are supported by the GNU C Library. The older name
64 _ISOC2X_SOURCE is still supported. Features from C23 are also enabled
65 by _GNU_SOURCE, or by compiling with the GCC options -std=c23,
66 -std=gnu23, -std=c2x or -std=gnu2x.
68 * The following ISO C23 function families (introduced in TS
69 18661-4:2015) are now supported in <math.h>. Each family includes
70 functions for float, double, long double, _FloatN and _FloatNx, and a
71 type-generic macro in <tgmath.h>.
73 - Exponential functions: exp2m1, exp10m1.
75 - Logarithmic functions: log2p1, log10p1, logp1.
77 * A new tunable, glibc.rtld.enable_secure, can be used to run a program
78 as if it were a setuid process. This is currently a testing tool to allow
79 more extensive verification tests for AT_SECURE programs and not meant to
80 be a security feature.
82 * On Linux, the epoll header was updated to include epoll ioctl definitions
83 and the related structure added in Linux kernel 6.9.
85 * The fortify functionality has been significantly enhanced for building
86 programs with clang against the GNU C Library.
88 * Many functions have been added to the vector library for aarch64:
89 acosh, asinh, atanh, cbrt, cosh, erf, erfc, hypot, pow, sinh, tanh
91 * On x86, memset can now use non-temporal stores to improve the performance
92 of large writes. This behaviour is controlled by a new tunable
93 x86_memset_non_temporal_threshold.
95 Deprecated and removed features, and other changes affecting compatibility:
97 * Architectures which use a 32-bit seconds-since-epoch field in struct
98 lastlog, struct utmp, struct utmpx (such as i386, powerpc64le, rv32,
99 rv64, x86-64) switched from a signed to an unsigned type for that
100 field. This allows these fields to store timestamps beyond the year
101 2038, until the year 2106. Please note that applications are still
102 expected to migrate off the interfaces declared in <utmp.h> and
103 <utmpx.h> (except for login_tty) due to locking and session management
106 * __rseq_size now denotes the size of the active rseq area (20 bytes
107 initially), not the size of struct rseq (32 bytes initially).
109 Security related changes:
111 The following CVEs were fixed in this release, details of which can be
112 found in the advisories directory of the release tarball:
115 ISO-2022-CN-EXT: fix out-of-bound writes when writing escape
116 sequence (CVE-2024-2961)
119 nscd: Stack-based buffer overflow in netgroup cache (CVE-2024-33599)
122 nscd: Null pointer crash after notfound response (CVE-2024-33600)
125 nscd: netgroup cache may terminate daemon on memory allocation
126 failure (CVE-2024-33601)
129 nscd: netgroup cache assumes NSS callback uses in-buffer strings
132 The following bugs are resolved with this release:
134 [19622] network: Support aliasing with struct sockaddr
135 [21271] localedata: cv_RU: update translations
136 [23774] localedata: lv_LV collates Y/y incorrectly
137 [23865] string: wcsstr is quadratic-time
138 [25119] localedata: Change Czech weekday names to lowercase
139 [27777] stdio: fclose does a linear search, takes ages when many FILE*
141 [29770] libc: prctl does not match manual page ABI on powerpc64le-
143 [29845] localedata: Update hr_HR locale currency to €
144 [30701] time: getutxent misbehaves on 32-bit x86 when _TIME_BITS=64
145 [31316] build: Fails test misc/tst-dirname "Didn't expect signal from
146 child: got `Illegal instruction'" on non SSE CPUs
147 [31317] dynamic-link: [RISCV] static PIE crashes during self
149 [31325] libc: mips: clone3 is wrong for o32
150 [31335] math: Compile glibc with -march=x86-64-v3 should disable FMA4
152 [31339] libc: arm32 loader crash after cleanup in 2.36
153 [31340] manual: A bad sentence in section 22.3.5 (resource.texi)
154 [31357] dynamic-link: $(objpfx)tst-rtld-list-diagnostics.out rule
155 doesn't work with test wrapper
156 [31370] localedata: wcwidth() does not treat
157 DEFAULT_IGNORABLE_CODE_POINTs as zero-width
158 [31371] dynamic-link: x86-64: APX and Tile registers aren't preserved
160 [31372] dynamic-link: _dl_tlsdesc_dynamic doesn't preserve all caller-
162 [31383] libc: _FORTIFY_SOURCE=3 and __fortified_attr_access vs size of
163 0 and zero size types
164 [31385] build: sort-makefile-lines.py doesn't check variable with _
165 nor with "^# variable"
166 [31402] libc: clone (NULL, NULL, ...) clobbers %r7 register on
168 [31405] libc: Improve dl_iterate_phdr using _dl_find_object
169 [31411] localedata: Add Latgalian locale
170 [31412] build: GCC 6 failed to build i386 glibc on Fedora 39
171 [31429] build: Glibc failed to build with -march=x86-64-v3
172 [31468] libc: sigisemptyset returns true when the set contains signals
174 [31476] network: Automatic activation of single-request options break
175 resolv.conf reloading
176 [31479] libc: Missing #include <sys/rseq.h> in sched_getcpu.c may
177 result in a loss of rseq acceleration
178 [31501] dynamic-link: _dl_tlsdesc_dynamic_xsavec may clobber %rbx
179 [31518] manual: documentation: FLT_MAX_10_EXP questionable text, evtl.
181 [31530] localedata: Locale file for Moksha - mdf_RU
182 [31553] malloc: elf/tst-decorate-maps fails on ppc64el
183 [31596] libc: On the llvm-arm32 platform, dlopen("not_exist.so", -1)
184 triggers segmentation fault
185 [31600] math: math: x86 ceill traps when FE_INEXACT is enabled
186 [31601] math: math: x86 floor traps when FE_INEXACT is enabled
187 [31603] math: math: x86 trunc traps when FE_INEXACT is enabled
188 [31612] libc: arc4random fails to fallback to /dev/urandom if
189 getrandom is not present
190 [31629] build: powerpc64: Configuring with "--with-cpu=power10" and
191 'CFLAGS=-O2 -mcpu=power9' fails to build glibc
192 [31640] dynamic-link: POWER10 ld.so crashes in
193 elf_machine_load_address with GCC 14
194 [31661] libc: NPROCESSORS_CONF and NPROCESSORS_ONLN not available in
196 [31676] dynamic-link: Configuring with CC="gcc -march=x86-64-v3"
197 --with-rtld-early-cflags=-march=x86-64 results in linker failure
198 [31677] nscd: nscd: netgroup cache: invalid memcpy under low
199 memory/storage conditions
200 [31678] nscd: nscd: Null pointer dereferences after failed netgroup
202 [31679] nscd: nscd: netgroup cache may terminate daemon on memory
204 [31680] nscd: nscd: netgroup cache assumes NSS callback uses in-buffer
206 [31682] math: [PowerPC] Floating point exception error for math test
207 test-ceil-except-2 test-floor-except-2 test-trunc-except-2
208 [31686] dynamic-link: Stack-based buffer overflow in
209 parse_tunables_string
210 [31695] libc: pidfd_spawn/pidfd_spawnp leak an fd if clone3 succeeds
212 [31719] dynamic-link: --enable-hardcoded-path-in-tests doesn't work
213 with -Wl,--enable-new-dtags
214 [31730] libc: backtrace_symbols_fd prints different strings than
215 backtrace_symbols returns
216 [31753] build: FAIL: link-static-libc with GCC 6/7/8
217 [31755] libc: procutils_read_file doesn't start with a leading
219 [31756] libc: write_profiling is only in libc.a
220 [31757] build: Should XXXf128_do_not_use functions be excluded?
221 [31759] math: Extra nearbyint symbols in libm.a
222 [31760] math: Missing math functions
223 [31764] build: _res_opcodes should be a compat symbol only
224 [31765] dynamic-link: _dl_mcount_wrapper is exported without prototype
225 [31766] stdio: _IO_stderr_ _IO_stdin_ _IO_stdout should be compat
227 [31768] string: Extra stpncpy symbol in libc.a
228 [31770] libc: clone3 is in libc.a
229 [31774] libc: Missing __isnanf128 in libc.a
230 [31775] math: Missing exp10 exp10f32x exp10f64 fmod fmodf fmodf32
231 fmodf32x fmodf64 in libm.a
232 [31777] string: Extra memchr strlen symbols in libc.a
233 [31781] math: Missing math functions in libm.a
234 [31782] build: Test build failure with recent GCC trunk (x86/tst-cpu-
235 features-supports.c:69:3: error: parameter to builtin not valid:
237 [31785] string: loongarch: Extra strnlen symbols in libc.a
238 [31786] string: powerpc: Extra strchrnul and strncasecmp_l symbols in
240 [31787] math: powerpc: Extra llrintf, llrintf, llrintf32, and
241 llrintf32 symbols in libc.a
242 [31788] libc: microblaze: Extra cacheflush symbol in libc.a
243 [31789] libc: powerpc: Extra versionsort symbol in libc.a
244 [31790] libc: s390: Extra getutent32, getutent32_r, getutid32,
245 getutid32_r, getutline32, getutline32_r, getutmp32, getutmpx32,
246 getutxent32, getutxid32, getutxline32, pututline32, pututxline32,
247 updwtmp32, updwtmpx32 in libc.a
248 [31797] build: g++ -static requirement should be able to opt-out
249 [31798] libc: pidfd_getpid.c is miscompiled by GCC 6.4
250 [31802] time: difftime is pure not const
251 [31808] time: The supported time_t range is not documented.
252 [31840] stdio: Memory leak in _IO_new_fdopen (fdopen) on seek failure
253 [31867] build: "CPU ISA level is lower than required" on SSE2-free
255 [31876] time: "Date and time" documentation fixes for POSIX.1-2024 etc
256 [31883] build: ISA level support configure check relies on bashism /
257 is otherwise broken for arithmetic
258 [31892] build: Always install mtrace.
259 [31917] libc: clang mq_open fortify wrapper does not handle 4 argument
261 [31927] libc: clang open fortify wrapper does not handle argument
263 [31931] time: tzset may fault on very short TZ string
264 [31934] string: wcsncmp crash on s390x on vlbb instruction
265 [31963] stdio: Crash in _IO_link_in within __gcov_exit
266 [31965] dynamic-link: rseq extension mechanism does not work as
268 [31980] build: elf/tst-tunables-enable_secure-env fails on ppc
274 * A new tunable, glibc.cpu.plt_rewrite, can be used to enable PLT
275 rewrite on x86-64. When enabled with non-lazy binding, the dynamic
276 linker will rewrite indirect branches in PLT with direct branches.
278 * Sync with Linux kernel 6.6 shadow stack interface. The --enable-cet
279 configure option is only supported on x86-64.
281 * struct statvfs now has an f_type member, equal to the f_type statfs member;
282 on the Hurd this was always available under a reserved name,
283 and under Linux a spare has been allocated: it was always zero
284 in previous versions of glibc, and zero is not a valid result.
286 * On Linux, the functions posix_spawnattr_getcgroup_np and
287 posix_spawnattr_setcgroup_np have been added, along with the
288 POSIX_SPAWN_SETCGROUP flag. They allow posix_spawn and posix_spawnp
289 to set the cgroupv2 in the new process in a race-free manner. These
290 functions are GNU extensions and require a kernel with clone3 support.
292 * On Linux, the pidfd_spawn and pidfd_spawp functions have been added.
293 They have a similar prototype and semantic as posix_spawn, but instead of
294 returning a process ID, they return a file descriptor that can be used
295 along other pidfd functions (like pidfd_send_signal, poll, or waitid).
296 The pidfd functionality avoids the issue of PID reuse with the traditional
297 posix_spawn interface.
299 * On Linux, the pidfd_getpid function has been added. It allows retrieving
300 the process ID associated with the process file descriptor created by
301 pid_spawn, fork_np, or pidfd_open.
303 * scanf-family functions now support the wN format length modifiers for
304 arguments pointing to types intN_t, int_leastN_t, uintN_t or
305 uint_leastN_t (for example, %w32d to read int32_t or int_least32_t in
306 decimal, or %w32x to read uint32_t or uint_least32_t in hexadecimal)
307 and the wfN format length modifiers for arguments pointing to types
308 int_fastN_t or uint_fastN_t, as specified in draft ISO C2X.
310 * A new tunable, glibc.mem.decorate_maps, can be used to add additional
311 information on underlying memory allocated by the glibc (for instance,
312 on thread stack created by pthread_create or memory allocated by
315 * The <stdbit.h> header has been added from ISO C2X, with
316 stdc_leading_zeros, stdc_leading_ones, stdc_trailing_zeros,
317 stdc_trailing_ones, stdc_first_leading_zero, stdc_first_leading_one,
318 stdc_first_trailing_zero, stdc_first_trailing_one, stdc_count_zeros,
319 stdc_count_ones, stdc_has_single_bit, stdc_bit_width, stdc_bit_floor
320 and stdc_bit_ceil function families, each having functions for
321 unsigned char, unsigned short, unsigned int, unsigned long int and
322 unsigned long long int, and a type-generic macro.
324 * On AArch64 new symbols were added to libmvec and now math.h has
325 annotations to allow GCC 9 or newer to auto-vectorize calls to the
326 following scalar math functions when -ffast-math is specified:
327 acos, acosf, asin, asinf, atan, atanf, atan2, atan2f, cos, cosf,
328 exp, expf, exp10, exp10f, exp2, exp2f, expm1, expm1f, log, logf,
329 log10, log10f, log1p, log1pf, log2, log2f, sin, sinf, tan, tanf.
331 Deprecated and removed features, and other changes affecting compatibility:
333 * The ldconfig program now skips file names containing ';' or ending in
334 ".dpkg.tmp" or ".dpkg.new", to avoid examining temporary files created
335 by the RPM and dpkg package managers.
337 * libcrypt has been removed from the GNU C Library. The configure
338 options "--enable-crypt" and "--enable-nss-crypt" are no longer
339 available. <crypt.h>, libcrypt.a, and libcrypt.so.1 will not be
340 installed. For now <unistd.h> continues to declare the crypt
341 function by default, to avoid introducing vulnerabilities into
342 existing applications due to a missing prototype. This declaration
343 is deprecated and may be removed in a future glibc release.
345 The replacement for libcrypt is libxcrypt, maintained separately from
346 GNU libc, but available under compatible licensing terms, and providing
347 binary backward compatibility with the former libcrypt. It is currently
348 distributed from <https://github.com/besser82/libxcrypt/>.
350 As a consequence of this removal, GNU libc no longer makes any use of
351 the NSS cryptography library (Network Security Services; not to be
352 confused with Name Service Switch). Distributors of binary packages
353 of GNU libc are advised to check whether their build processes can be
356 * The dynamic linker calls the malloc and free functions in more cases
357 during TLS access if a shared object with dynamic TLS is loaded and
358 unloaded. This can result in an infinite recursion if a malloc
359 replacement library or its dependencies use dynamic TLS instead of
362 * The ia64*-*-linux-gnu configurations are no longer supported.
364 Changes to build and runtime requirements:
366 * Building on LoongArch requires at a minimum binutils 2.41 for vector
369 Security related changes:
371 The following CVEs were fixed in this release, details of which can be
372 found in the advisories directory of the release tarball:
375 getaddrinfo: Stack read overflow in no-aaaa mode (CVE-2023-4527)
378 getaddrinfo: Potential use-after-free (CVE-2023-4806)
381 tunables: local privilege escalation through buffer overflow
385 syslog: Heap buffer overflow in __vsyslog_internal (CVE-2023-6246)
388 syslog: Heap buffer overflow in __vsyslog_internal (CVE-2023-6779)
391 syslog: Integer overflow in __vsyslog_internal (CVE-2023-6780)
394 ISO-2022-CN-EXT: fix out-of-bound writes when writing escape
395 sequence (CVE-2024-2961)
398 nscd: Stack-based buffer overflow in netgroup cache (CVE-2024-33599)
401 nscd: Null pointer crashes after notfound response
405 nscd: netgroup cache may terminate daemon on memory allocation
406 failure (CVE-2024-33601)
409 nscd: netgroup cache assumes NSS callback uses in-buffer strings
412 The following bugs are resolved with this release:
414 [14522] localedata: fy_DE: LC_IDENTIFICATION data looks weird
415 [19305] libc: qsort() should return early if (nmemb <= 1)
416 [19479] localedata: gbm_IN: new Garhwali Locale
417 [19924] dynamic-link: TLS performance degradation after dlopen
418 [19956] localedata: ssy_ER: rename from aa_ER@saaho
419 [21719] libc: stdlib/msort : optimizing merge sort
420 [22526] localedata: th_TH LC_COLLATE does not use copy "iso14651_t1"
421 [23012] localedata: el_GR: Greece now uses the 24h format for time
422 [23172] localedata: miq_NI: Provide actually abbreviated month names
423 [24006] localedata: Cyclic dependencies via copy in locales
424 [24013] localedata: am_pm definitions for es_ES
425 [24386] localedata: crh_RU: new locale
426 [24877] localedata: [Redundant Data] Remove redundant data between
428 [25868] localedata: Incorrect trailing spaces in weekday names for
430 [26752] localedata: Please add the new locale zgh_MA
431 [27069] dynamic-link: Need a way to tell if a tunable is set by user
432 [27163] localedata: Error on test glk_IR with localedef
433 [27312] localedata: su_ID: new Sundanese locale
434 [27547] manual: "Summary of malloc-Related Functions" shows wrong
435 argument order for `aligned_alloc` and `memalign`
436 [27574] libc: glibc should probably not define __WORDSIZE=64 for
438 [27601] localedata: License information update in
439 localedata/locales/ast_ES
440 [28558] localedata: it_IT LC_MONETARY outdated p_cs_precedes and
442 [28787] localedata: Add information for Occitan
443 [29039] dynamic-link: Corrupt DTV after reuse of a TLS module ID
444 following dlclose with unused TLS
445 [29486] localedata: New Zealand locales (en_NZ & mi_NZ) first day of
446 week should be Monday
447 [29504] localedata: Incorrect/misleading Time Format For ms_MY (AM/PM)
448 [29506] localedata: UTF-8 HANGUL SYLLABLE bugs
449 [30349] libc: Support returning a pidfd from posix_spawn()
450 [30412] localedata: d_t_fmt in id_ID uses %r placeholder but am_pm and
451 t_fmt_ampm are undefined
452 [30605] localedata: New locale for Komi language
453 [30649] localedata: [PATCH] Add transliteration of common emojis to
455 [30694] locale: The iconv program no longer tells the user which given
456 encoding name was wrong
457 [30709] nscd: nscd fails to build with cleanup handler if built with
459 [30737] libc: fdopendir() is not robust - returns bogus DIR* instead
461 [30740] build: [m68k] undefined reference to
462 `_wordcopy_fwd_dest_aligned'
463 [30745] libc: Slight bug in cache info codes for x86
464 [30750] network: Unaligned accesses in resolver
465 [30773] math: [m68k] busybox awk is broken (lshift.S related)
466 [30789] libc: [2.38 Regression] sem_open will fail on multithreaded
467 scenarios when semaphore file doesn't exist (O_CREAT)
468 [30800] nscd: Improper assert in prune_cache triggers if clock jumps
470 [30804] libc: F_GETLK, F_SETLK, and F_SETLKW value change for
471 powerpc64 with -D_FILE_OFFSET_BITS=64
472 [30842] network: Stack read overflow in getaddrinfo in no-aaaa mode
474 [30843] network: potential use-after-free in getcanonname
476 [30854] localedata: Update locale data to Unicode 15.1.0
477 [30884] network: Memory leak in getaddrinfo after fix for bug 30843
479 [30932] libc: Fortify Source has false-positives when too many files
481 [30945] malloc: Core affinity setting incurs lock contentions between
483 [30960] math: signed integer overflow in
484 glibc/sysdeps/s390/fpu/feenablxcpt.c
485 [30964] locale: Number grouping check mishandles multibyte thousands
487 [30981] dynamic-link: dlclose does not properly implement force-first
489 [30988] math: fesetexcept raises floating-point exception traps on
491 [30989] math: fesetexcept raises floating-point exception traps on
493 [30990] libc: fesetexceptflag raises floating-point exception traps on
495 [30998] math: fesetexceptflag clears too many floating-point exception
497 [31019] manual: The documentation of feenableexcept is incomplete
498 [31022] math: feupdateenv (FE_DFL_ENV) crashes on riscv
499 [31035] libc: Library search path terminates on relative non-directory
501 [31042] libc: [s390x] .init and .fini padding
502 [31068] libc: sysdeps: sparc: invalid data access in memset due to
504 [31078] manual: Code example in "Noncanonical Mode Example" has unused
506 [31086] localedata: Errors in Tibetan, Dzongkha data
507 [31113] string: Wrong unwind information for rawmemchr on aarch64
508 [31151] libc: [RISC-V] missing support for profile/audit PLT setup
509 [31163] nss: getaddrinfo returns EAI_NONAME in oom situation
510 [31183] stdio: Wide stream buffer size reduced MB_LEN_MAX bytes after
512 [31184] dynamic-link: FAIL: elf/tst-tlsgap
513 [31185] dynamic-link: Incorrect thread point access in
514 _dl_tlsdesc_undefweak and _dl_tlsdesc_dynamic
515 [31187] dynamic-link: Some CET tests fail with GCC 14
516 [31204] localedata: Fix decimal point and thousands separator for
518 [31205] localedata: Inconsistent (mon_)grouping formats
519 [31218] dynamic-link: PLT rewrite overflows large displacement on x32
520 [31221] localedata: Add localedata for ISO code "tok" (Toki Pona)
521 [31230] dynamic-link: PLT rewrite failed without SELinux
522 [31239] localedata: anp_IN locale: abbreviated month names are the
523 same as the full month names
524 [31244] nptl: pthread_cancel hangs on sparc32
525 [31257] localedata: Sync with CLDR: “Turkey” -> “Türkiye”
526 [31266] string: sparc: string/tst-memmove-overflow fails on 32-bit
528 [31276] libc: Wrong condition for heap allocation in qsort_r
534 * When C2X features are enabled and the base argument is 0 or 2, the
535 following functions support binary integers prefixed by 0b or 0B as
536 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
537 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
538 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
539 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
540 following functions support binary integers prefixed by 0b or 0B as
541 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
542 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
543 functions also support the %b format for binary integers, with or
544 without such a prefix and independent of standards mode.
546 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
549 * printf-family functions now support the wN format length modifiers for
550 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
551 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
552 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
553 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
554 specified in draft ISO C2X.
556 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
557 Transparent Huge Pages (THP) in stack allocation at pthread_create.
559 * Support for x86_64 running on Hurd has been added. This port requires
560 as least binutils 2.40 and GCC 13:
564 * Vector math library libmvec support has been added to AArch64. It
565 requires GCC version >= 10.1.0. It can be disabled via
566 "--disable-mathvec", however that is not a supported configuration as
567 it changes the ABI. The symbol names follow the AArch64 vector ABI,
568 they are declared in math.h and have to be called manually at this point.
570 * The strlcpy and strlcat functions have been added. They are derived
571 from OpenBSD, and are expected to be added to a future POSIX version.
573 * A new configure option, "--enable-fortify-source", can be used to build the
574 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
575 provided, or is set to the highest value supported by the compiler. If not
576 explicitly enabled, then fortify source is forcibly disabled so to keep
577 original behavior unchanged.
579 Deprecated and removed features, and other changes affecting compatibility:
581 * libcrypt is no longer built by default; one may use the "--enable-crypt"
582 option to build libcrypt. libcrypt is likely to be removed from the
583 GNU C Library in a future release, so it is recommended that
584 applications port away from it to an alternative such as libxcrypt.
586 * In the Linux kernel for the hppa/parisc architecture some of the
587 MADV_XXX constants were changed to have the same values as the other
588 architectures. New programs compiled with this glibc version and which
589 use the madvise call will require at least Linux kernel version 6.2,
590 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
591 5.4.228, 4.19.270 or 4.14.303.
593 * The "--disable-experimental-malloc" option is no longer available. The
594 per-thread cache can still be disabled per-application using tunables
595 (glibc.malloc.tcache_count set to zero).
597 * The configure option "--enable-tunables" has been removed. The tunable
598 feature is now always enabled.
600 Changes to build and runtime requirements:
602 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
605 Security related changes:
607 CVE-2023-25139: When the printf family of functions is called with a
608 format specifier that uses an <apostrophe> (enable grouping) and a
609 minimum width specifier, the resulting output could be larger than
610 reasonably expected by a caller that computed a tight bound on the
611 buffer size. The resulting larger than expected output could result
612 in a buffer overflow in the printf family of functions.
614 The following bugs are resolved with this release:
616 [178] string: Please add strlcpy and strlcat (attached)
617 [14697] nptl: Behavior of exit is nonconformant with respect to
619 [15142] stdio: Missing locking in _IO_cleanup
620 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
621 [18906] stdio: fopen: ccs value may affect open mode
622 [24466] stdio: Feature request: provide special printf formats for
624 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
625 [28519] libc: system and popen should pass "--" between /bin/sh and
627 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
628 [29591] string: wcsnlen length can overflow in page cross case.
629 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
630 [30068] stdio: incorrect printf output for integers with thousands
631 separator and width field (CVE-2023-25139)
632 [30111] time: support_descriptors_list fails after 2038 on 32 bits
634 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
635 symlink for libraries without soname
636 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
638 [30156] time: Potential ntp_gettime abi break
639 [30235] libc: Missing fallback in getlogin if loginuid is unset
640 [30258] dynamic-link: sprof cannot read and display shared object
641 profiling data correctly
642 [30263] libc: Add test coverage for abs(), labs(), and llabs().
643 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
644 [30402] libc: FAIL: elf/tst-glibcelf
645 [30425] dynamic-link: Symbol lookup during dlclose may fail
647 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
648 [30477] libc: [RISCV]: time64 does not work on riscv32
649 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
651 [30527] network: resolv_conf lock not unlocked on allocation failure
652 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
654 [30555] string: strerror can incorrectly return NULL
655 [30579] malloc: trim_threshold in realloc lead to high memory usage
656 [30662] nscd: Group and password cache use errno in place of errval
662 * The getent tool now supports the --no-addrconfig option. The output of
663 getent with --no-addrconfig may contain addresses of families not
664 configured on the current host i.e. as-if you had not passed
665 AI_ADDRCONFIG to getaddrinfo calls.
667 Deprecated and removed features, and other changes affecting compatibility:
669 * The dynamic linker no longer loads shared objects from the "tls"
670 subdirectories on the library search path or the subdirectory that
671 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
672 search mechanism, which was deprecated in version 2.33.
674 Security related changes:
676 CVE-2022-39046: When the syslog function is passed a crafted input
677 string larger than 1024 bytes, it reads uninitialized memory from the
678 heap and prints it to the target log file, potentially revealing a
679 portion of the contents of the heap.
681 The following bugs are resolved with this release:
683 [12154] network: Cannot resolve hosts which have wildcard aliases
684 [12165] libc: readdir: Do not skip entries with zero d_ino values
685 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
686 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
687 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
688 AF_INET6 address (ie docker)
689 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
691 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
692 [28937] dynamic-link: New DSO dependency sorter does not put new map
694 [29249] libc: csu/libc-tls.c:202: undefined reference to
695 `_startup_fatal_not_constant'
696 [29305] network: Inefficient buffer space usage in nss_dns for
697 gethostbyname and other functions
698 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
699 [29402] nscd: nscd: No such file or directory
700 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
702 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
703 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
705 [29463] math: math/test-float128-y1 fails on x86_64
706 [29485] build: Make hangs when the test misc/tst-pidfile returns
708 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
710 [29499] build: Check failed on misc/tst-glibcsyscalls while building
711 for RISCV64 on a unmatched hardware
712 [29501] build: Check failed on stdlib/tst-strfrom while building for
713 RISCV64 on a unmatched hardware
714 [29502] libc: alpha sys/acct.h out of date
715 [29514] build: Need to use -fPIE not -fpie
716 [29528] dynamic-link: __libc_early_init not called after dlmopen that
718 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
719 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
721 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
723 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
725 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
726 [29576] build: librtld.os: in function `_dl_start_profile':
727 (.text+0x9444): undefined reference to `strcpy'
728 [29578] libc: Definition of SUN_LEN() is wrong
729 [29583] build: iconv failures on 32bit platform due to missing large
731 [29600] dynamic-link: dlmopen hangs after loading certain libraries
732 [29604] localedata: Update locale data to Unicode 15.0.0
733 [29605] nscd: Regression in NSCD backend of getaddrinfo
734 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
736 [29611] string: Optimized AVX2 string functions unconditionally use
738 [29624] malloc: errno is not cleared when entering main
739 [29638] libc: stdlib: arc4random fallback is never used
740 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
742 [29698] build: Configuring for AArch32 on ARMv8+ disables
744 [29727] locale: __strtol_internal out-of-bounds read when parsing
746 [29730] libc: broken y2038 support in fstatat on MIPS N64
747 [29746] libc: ppoll() does not switch to __ppoll64 when
748 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
749 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
750 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
751 aux.S: No such file or directory)
752 [29864] libc: __libc_start_main() should obtain program headers
753 address (_dl_phdr) from the auxv, not the ELF header.
754 [29951] time: daylight variable not set correctly if last DST change
755 coincides with offset change
756 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
757 length in fortify mode
763 * Support for DT_RELR relative relocation format has been added to
764 glibc. This is a new ELF dynamic tag that improves the size of
765 relative relocations in shared object files and position independent
766 executables (PIE). DT_RELR generation requires linker support for
767 -z pack-relative-relocs option, which is supported for some targets
768 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
770 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
771 have been added. The pidfd functionality provides access to a process
772 while avoiding the issue of PID reuse on traditional Unix systems.
774 * On Linux, the process_madvise function has been added. It has the
775 same functionality as madvise but alters the target process identified
778 * On Linux, the process_mrelease function has been added. It allows a
779 caller to release the memory of a dying process. The release of the
780 memory is carried out in the context of the caller, using the caller's
781 CPU affinity, and priority with CPU usage accounted to the caller.
783 * The “no-aaaa” DNS stub resolver option has been added. System
784 administrators can use it to suppress AAAA queries made by the stub
785 resolver, including AAAA lookups triggered by NSS-based interfaces
786 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
787 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
788 produce IPv6 addresses, and configured IPv6 name servers are still
789 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
790 are translated to A queries. The new resolver option is intended
791 primarily for diagnostic purposes, to rule out that AAAA DNS queries
792 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
793 validation by applications.
795 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
796 and mount_setattr have been added. They are part of the new Linux kernel
797 mount APIs that allow applications to more flexibly configure and operate
798 on filesystem mounts. The new mount APIs are specifically designed to work
801 * localedef now accepts locale definition files encoded in UTF-8.
802 Previously, input bytes not within the ASCII range resulted in
803 unpredictable output.
805 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
806 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
807 Support for the char8_t typedef has been added per the ISO C2X N2653
808 proposal. The functions are declared in uchar.h in C2X mode or when the
809 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
810 The char8_t typedef is declared in uchar.h in C2X mode or when the
811 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
812 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
814 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
815 added. The functions wrap getrandom and/or /dev/urandom to return high-
816 quality randomness from the kernel.
818 * Support for LoongArch running on Linux has been added. This port requires
819 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
822 - loongarch64-linux-gnu
824 The LoongArch ABI is 64-bit little-endian.
826 Deprecated and removed features, and other changes affecting compatibility:
828 * Support for prelink will be removed in the next release; this includes
829 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
830 variables and their functionality in the dynamic loader.
832 * The Linux kernel version check has been removed along with the
833 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
834 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
835 when libc.so is issued directly.
837 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
839 The following bugs are resolved with this release:
841 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
842 return different result with versioned "foo"
843 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
845 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
846 ./exe and ld.so adjusts argv on the stack
847 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
849 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
850 consuming the second byte of certain double byte characters
851 [25812] stdio: Libio vtable protection is sometimes only partially
853 [27054] libc: pthread_atfork handlers that call pthread_atfork
855 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
857 [28128] build: declare_symbol_alias doesn't work for assembly codes
858 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
859 [28752] nss: Segfault in getpwuid when stat fails
860 [28815] libc: realpath should not copy to resolved buffer on error
861 [28828] stdio: fputwc crashes
862 [28838] libc: FAIL: elf/tst-p_align3
863 [28845] locale: ld-monetary.c should be updated to match ISO C and
865 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
867 [28852] libc: getaddrinfo leaks memory with AI_ALL
868 [28853] libc: tst-spawn6 changes current foreground process group
869 (breaks test isolation)
870 [28857] libc: FAIL: elf/tst-audit24a
871 [28860] build: --enable-kernel=5.1.0 build fails because of missing
872 __convert_scm_timestamps
873 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
874 inaccurate without /sys and /proc
875 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
877 [28880] libc: Program crashes if date beyond 2038
878 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
879 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
880 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
881 rtm variants when avoiding overflow
882 [28922] build: The .d dependency files aren't always generated
883 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
885 [28936] build: nm: No such file
886 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
887 [28953] nss: NSS lookup result can be incorrect if function lookup
889 [28970] math: benchtest: libmvec benchmark doesn't build with make
891 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
892 /sys/devices/system/cpu/possible
893 [28993] libc: closefrom() iterates until max int if no access to
895 [28996] libc: realpath fails to copy partial result to resolved buffer
897 [29027] math: [ia64] fabs fails with sNAN input
898 [29029] nptl: poll() spuriously returns EINTR during thread
899 cancellation and with cancellation disabled
900 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
901 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
902 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
903 is promoted to global scope
904 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
905 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
906 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
908 [29097] time: fchmodat does not handle 64 bit time_t for
910 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
912 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
913 [29162] string: [PATCH] string.h syntactic error:
914 include/bits/string_fortified.h:110: error: expected ',' or ';'
915 before '__fortified_attr_access'
916 [29165] libc: [Regression] broken argv adjustment
917 [29187] dynamic-link: [regression] broken argv adjustment for nios2
918 [29193] math: sincos produces a different output than sin/cos
919 [29197] string: __strncpy_power9() uses uninitialised register vs18
920 value for filling after \0
921 [29203] libc: daemon is not y2038 aware
922 [29204] libc: getusershell is not 2038 aware
923 [29207] libc: posix_fallocate fallback implementation is not y2038
925 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
926 [29209] libc: isfdtype is not y2038 aware
927 [29210] network: ruserpass is not y2038 aware
928 [29211] libc: __open_catalog is not y2038 aware
929 [29213] libc: gconv_parseconfdir is not y2038 aware
930 [29214] nptl: pthread_setcanceltype fails to set type
931 [29225] network: Mistyped define statement in socket/sys/socket.h in
933 [29274] nptl: __read_chk is not a cancellation point
934 [29279] libc: undefined reference to `mbstowcs_chk' after
935 464d189b9622932a75302290625de84931656ec0
936 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
937 correct for !__ASSUME_TIME64_SYSCALLS
938 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
939 missing on microblaze with largefile
945 * Unicode 14.0.0 Support: Character encoding, character type info, and
946 transliteration tables are all updated to Unicode 14.0.0, using
947 generator scripts contributed by Mike FABIAN (Red Hat).
949 * Bump r_version in the debugger interface to 2 and add a new field,
950 r_next, support multiple namespaces.
952 * Support for the C.UTF-8 locale has been added to glibc. The locale
953 supports full code-point sorting for all valid Unicode code points. A
954 limitation in the framework for fnmatch, regexec, and regcomp requires
955 a compromise to save space and only ASCII-based range expressions are
956 supported for now (see bug 28255). The full size of the locale is
957 only ~400KiB, with 346KiB coming from LC_CTYPE information for
958 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
959 in various downstream distributions. The locale is not built into
960 glibc, and must be installed.
962 * <math.h> functions that round their results to a narrower type, and
963 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
964 18661-3:2015 and draft ISO C2X:
966 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
967 fMxsqrtfN and fMxsqrtfNx functions.
969 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
972 * <math.h> functions for floating-point maximum and minimum,
973 corresponding to new operations in IEEE 754-2019, and corresponding
974 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
975 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
976 fminimum_mag, fminimum_mag_num and corresponding functions for float,
977 long double, _FloatN and _FloatNx.
979 * <math.h> macros for single-precision float constants are added as a
980 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
981 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
984 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
985 predefined as specified in TS 18661-1:2014.
987 * The exp10 functions in <math.h> now have a corresponding type-generic
990 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
992 * printf-family functions now support the %b format for output of
993 integers in binary, as specified in draft ISO C2X, and the %B variant
994 of that format recommended by draft ISO C2X.
996 * A new DSO sorting algorithm has been added in the dynamic linker that uses
997 topological sorting by depth-first search (DFS), solving performance issues
998 of the existing sorting algorithm when encountering particular circular
999 object dependency cases.
1001 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
1002 the two DSO sorting algorithms. The default setting of '2' uses the
1003 new DFS-based algorithm. The setting '1' switches to the old
1004 algorithm used in glibc 2.33 and earlier.
1006 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
1007 to be used by compilers for optimizing usage of 'memcmp' when its
1008 return value is only used for its boolean status.
1010 * Support for automatically registering threads with the Linux rseq
1011 system call has been added. This system call is implemented starting
1012 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
1013 operations on per-cpu data. It allows user-space to perform updates
1014 on per-cpu data without requiring heavy-weight atomic operations.
1015 Automatically registering threads allows all libraries, including
1016 libc, to make immediate use of the rseq support by using the
1017 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
1018 variables. The GNU C Library manual has details on integration of
1019 Restartable Sequences.
1021 * A symbolic link to the dynamic linker is now installed under
1022 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
1024 * All programs and the testsuite in glibc are now built as position independent
1025 executables (PIE) by default on toolchains and architectures that support it.
1026 Further, if the toolchain and architecture supports it, even static programs
1027 are built as PIE and the resultant glibc can be used to build static PIE
1028 executables. A new option --disable-default-pie has been added to disable
1029 this behavior and get a non-PIE build. This option replaces
1030 --enable-static-pie, which no longer has any effect on the build
1033 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
1034 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
1035 or to use huge pages directly with mmap calls with the MAP_HUGETLB
1036 flags). The former can improve performance when Transparent Huge Pages
1037 is set to 'madvise' mode while the latter uses the system reserved
1040 * The printf family of functions now handles the flagged %#m conversion
1041 specifier, printing errno as an error constant (similar to strerrorname_np).
1043 * The function _dl_find_object has been added. In-process unwinders
1044 can use it to efficiently locate unwinding information for a code
1047 * Support for OpenRISC running on Linux has been added. This port requires
1048 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
1053 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
1054 64-bit file offsets (LFS default).
1056 * A new configure option, --with-rtld-early-cflags, can be used to
1057 specify additional compiler flags for building the early startup code
1058 of the dynamic linker. On targets which have CPU compatibility
1059 checks, this can help to ensure that proper diagnostics are printed if
1060 the dynamic loader runs on an incompatible CPU.
1062 * On Linux, the epoll_pwait2 function has been added. It is similar to
1063 epoll_wait with the difference the timeout has nanoseconds resolution.
1065 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
1066 enabling posix_spawn and posix_spawnp to set the controlling terminal in
1067 the new process in a race free manner. This function is a GNU extension.
1069 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
1070 applications compiling with glibc and gcc 12 and later. Level 3 leverages
1071 the __builtin_dynamic_object_size function to deliver additional
1072 fortification balanced against additional runtime cost (checking non-constant
1075 * The audit libraries will avoid unnecessary slowdown if it is not required
1076 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
1078 Deprecated and removed features, and other changes affecting compatibility:
1080 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
1081 has been removed since the first PT_LOAD segment is no longer executable
1082 due to defaulting to -z separate-code.
1084 * The r_version update in the debugger interface makes the glibc binary
1085 incompatible with GDB binaries built without the following commits:
1087 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
1088 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
1090 when audit modules or dlmopen are used.
1092 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
1094 * The --enable-static-pie option is no longer available. The glibc build
1095 configuration script now automatically detects static-pie support in the
1096 toolchain and architecture and enables it if available.
1098 * The catchsegv script and associated libSegFault.so shared object have
1099 been removed. There are widely-deployed out-of-process alternatives for
1100 catching coredumps and backtraces.
1102 * Support for prelink will be removed in the next release; this includes
1103 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
1104 variables and their functionality in the dynamic loader.
1106 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
1107 functionality to obtain the program mapping address can be achieved by
1108 using LD_TRACE_LOADED_OBJECTS to value of 2.
1110 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
1111 support prelink PIE binaries.
1113 Changes to build and runtime requirements:
1115 * The audit module interface version LAV_CURRENT is increased to enable
1116 proper bind-now support. The loader now advertises via the la_symbind
1117 flags that PLT trace is not possible. New audit modules require the
1118 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
1119 modules are still loaded for all targets except aarch64.
1121 * The audit interface on aarch64 is extended to support both the indirect
1122 result location register (x8) and NEON Q register. Old audit modules are
1123 rejected by the loader. Audit modules must be rebuilt to use the newer
1124 structure sizes and the latest module interface version for LAV_CURRENT.
1126 Security related changes:
1128 CVE-2022-23219: Passing an overlong file name to the clnt_create
1129 legacy function could result in a stack-based buffer overflow when
1130 using the "unix" protocol. Reported by Martin Sebor.
1132 CVE-2022-23218: Passing an overlong file name to the svcunix_create
1133 legacy function could result in a stack-based buffer overflow.
1135 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
1136 function could result in a memory leak and potential access of
1137 uninitialized memory. Reported by Qualys.
1139 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
1140 function may result in an off-by-one buffer underflow and overflow
1141 when the current working directory is longer than PATH_MAX and also
1142 corresponds to the / directory through an unprivileged mount
1143 namespace. Reported by Qualys.
1145 The following bugs are resolved with this release:
1147 [12889] nptl: Race condition in pthread_kill
1148 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
1149 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
1150 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
1152 [15333] libc: Use 64-bit stat functions in installed programs
1153 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
1155 [15971] dynamic-link: No interface for debugger access to libraries
1157 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
1158 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
1159 deeply nested DSO dependencies.
1160 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
1161 ID whose lifetime has not ended
1162 [22542] network: buffer overflow in sunrpc clnt_create
1164 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
1165 TRACE_LOADED_OBJECTS
1166 [25947] malloc: memory leak in muntrace
1167 [26045] math: fmaxf(inf, nan) does not always work
1168 [26108] math: exp10() has problems with <tgmath.h>
1169 [26779] build: benign use after realloc at localealias.c:329
1170 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
1171 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
1172 [27945] build: build-many-glibcs.py doesn't configure GCC with
1173 --enable-initfini-array
1174 [27991] build: x86: sysdeps/x86/configure.ac breaks when
1175 libc_cv_include_x86_isa_level is loaded from cache
1176 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
1177 in __REDIRECT_NTH macro
1178 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
1179 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
1181 [28126] libc: nftw aborts for paths longer than PATH_MAX
1182 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
1183 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
1185 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
1186 [28185] math: Inaccurate j0f function (again)
1187 [28199] locale: iconvconfig prefix flag behaves differently in glibc
1189 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
1190 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
1192 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
1193 [28223] libc: mips: clone does not align stack
1194 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
1196 [28256] malloc: Conditional jump or move depends on uninitialised
1197 value(s) in __GI___tunables_init
1198 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
1199 spawn5 fail if stray fds are open
1200 [28310] libc: Do not use affinity mask for sysconf
1201 (_SC_NPROCESSORS_CONF)
1202 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
1204 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
1205 only dynamic section
1206 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
1207 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
1209 [28353] network: Race condition on __opensock
1210 [28357] dynamic-link: deadlock between pthread_create and ctors
1211 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
1212 [28361] nptl: Fix for bug 12889 causes setxid deadlock
1213 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
1214 [28390] localedata: Update locale data to Unicode 14.0.0
1215 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
1217 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
1218 locale "en_US.UTF-8"
1219 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
1220 to tgkill (getpid (), gettid())
1221 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
1222 [28457] dynamic-link: Missing reldepmod4.so dependency for
1224 [28469] time: linux: struct timex is not correctly set for 32-bit
1225 systems with TIMESIZE=64
1226 [28470] regex: Buffer read overrun in regular expression searching
1227 [28475] string: Incorrect access attribute on memfrob
1228 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
1229 spurious NUL character on state reset
1230 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
1232 [28550] dynamic-link: FAIL: tst-dso-
1233 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
1235 [28554] build: Undefined generate-md5
1236 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
1238 [28607] nptl: Masked signals are delivered on thread exit
1239 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
1240 lack of cpu counting /proc fallback with glibc 2.34
1241 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
1242 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
1243 [28648] dynamic-link: Running ld.so on statically linked binaries
1245 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
1247 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
1248 [28678] nptl: nptl/tst-create1 hangs sporadically
1249 [28688] dynamic-link: PT_LOAD p_align check is too strict
1250 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
1252 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
1253 timezones generated by tzcode-2021d and later
1254 [28713] math: GCC 12 miscompiles libm
1255 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
1256 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
1257 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
1258 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
1259 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
1260 Assertion `GL(dl_rtld_map).l_libname' failed!
1261 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
1262 [28757] nptl: GDB printer tests failed with new GDB
1263 [28765] math: x86_64 libmvec atan2 accuracy
1264 [28766] manual: Document libmvec accuracy
1265 [28768] network: Buffer overflow in svcunix_create with long pathnames
1267 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
1269 [28770] libc: Unexpected return value from realpath() for too long
1270 results (CVE-2021-3998)
1271 [28771] libc: %ebx optimization macros are incompatible with .altmacro
1273 [28780] build: --disable-default-pie doesn't work on static programs
1274 [28782] libc: x86-64 ISA level for glibc itself is always
1276 [28792] glob: possible wrong behaviour with patterns with double [
1278 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
1279 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
1280 empty mon_decimal_point_wc
1287 * In order to support smoother in-place-upgrades and to simplify
1288 the implementation of the runtime all functionality formerly
1289 implemented in the libraries libpthread, libdl, libutil, libanl has
1290 been integrated into libc. New applications do not need to link with
1291 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
1292 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
1293 provided, so that the linker options keep working. Applications which
1294 have been linked against glibc 2.33 or earlier continue to load the
1295 corresponding shared objects (which are now empty). The integration
1296 of those libraries into libc means that additional symbols become
1297 available by default. This can cause applications that contain weak
1298 references to take unexpected code paths that would only have been
1299 used in previous glibc versions when e.g. preloading libpthread.so.0,
1300 potentially exposing application bugs.
1302 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
1303 PTHREAD_STACK_MIN is no longer constant and is redefined to
1304 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
1305 sets for modern architectural features like Arm SVE.
1307 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
1308 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
1309 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
1310 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
1311 dynamic sized register sets for modern architectural features like
1314 * The dynamic linker implements the --list-diagnostics option, printing
1315 a dump of information related to IFUNC resolver operation and
1316 glibc-hwcaps subdirectory selection.
1318 * On Linux, the function execveat has been added. It operates similar to
1319 execve and it is is already used to implement fexecve without requiring
1320 /proc to be mounted. However, different than fexecve, if the syscall is not
1321 supported by the kernel an error is returned instead of trying a fallback.
1323 * The ISO C2X function timespec_getres has been added.
1325 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
1326 C2X, is supported to enable declarations of functions defined in Annex F
1327 of C2X. Those declarations are also enabled when
1328 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
1329 defined, and when _GNU_SOURCE is defined.
1331 * On powerpc64*, glibc can now be compiled without scv support using the
1332 --disable-scv configure option.
1334 * Add support for 64-bit time_t on configurations like x86 where time_t
1335 is traditionally 32-bit. Although time_t still defaults to 32-bit on
1336 these configurations, this default may change in future versions.
1337 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
1338 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
1339 only enabled for Linux and the full support requires a minimum kernel
1342 * The main gconv-modules file in glibc now contains only a small set of
1343 essential converter modules and the rest have been moved into a supplementary
1344 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
1345 in the same GCONV_PATH. Similarly, external converter modules directories
1346 may have supplementary configuration files in a gconv-modules.d directory
1347 with names ending with .conf to logically classify the converter modules in
1350 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
1351 to configure the size of the thread stack cache.
1353 * The function _Fork has been added as an async-signal-safe fork replacement
1354 since Austin Group issue 62 dropped the async-signal-safe requirement for
1355 fork (and it will be included in the future POSIX standard). The new _Fork
1356 function does not run any atfork function neither resets any internal state
1357 or lock (such as the malloc one), and only sets up a minimal state required
1358 to call async-signal-safe functions (such as raise or execve). This function
1359 is currently a GNU extension.
1361 * On Linux, the close_range function has been added. It allows efficiently
1362 closing a range of file descriptors on recent kernels (version 5.9).
1364 * The function closefrom has been added. It closes all file descriptors
1365 greater than or equal to a given integer. This function is a GNU extension,
1366 although it is also present in other systems.
1368 * The posix_spawn_file_actions_addclosefrom_np function has been added,
1369 enabling posix_spawn and posix_spawnp to close all file descriptors greater
1370 than or equal to a given integer. This function is a GNU extension,
1371 although Solaris also provides a similar function.
1373 * When invoked explicitly, the dynamic linker now uses the kernel to
1374 execute programs that do not have any dynamic dependency (that is,
1375 they are statically linked). This feature is Linux-specific.
1377 Deprecated and removed features, and other changes affecting compatibility:
1379 * The function pthread_mutex_consistent_np has been deprecated; programs
1380 should use the equivalent standard function pthread_mutex_consistent
1383 * The function pthread_mutexattr_getrobust_np has been deprecated;
1384 programs should use the equivalent standard function
1385 pthread_mutexattr_getrobust instead.
1387 * The function pthread_mutexattr_setrobust_np has been deprecated;
1388 programs should use the equivalent standard function
1389 pthread_mutexattr_setrobust instead.
1391 * The function pthread_yield has been deprecated; programs should use
1392 the equivalent standard function sched_yield instead.
1394 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
1396 * Various rarely-used functions declared in <resolv.h> and
1397 <arpa/nameser.h> have been deprecated. Applications are encouraged to
1398 use dedicated DNS processing libraries if applicable. For <resolv.h>,
1399 this affects the functions dn_count_labels, fp_nquery, fp_query,
1400 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
1401 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
1402 p_type, putlong, putshort, res_hostalias, res_isourserver,
1403 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
1404 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
1405 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
1406 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
1408 * Various symbols previously defined in libresolv have been moved to libc
1409 in order to prepare for libresolv moving entirely into libc (see earlier
1410 entry for merging libraries into libc). The symbols __dn_comp,
1411 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
1412 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
1413 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
1414 __res_search, __res_send formerly in libresolv have been renamed and no
1415 longer have a __ prefix. They are now available in libc.
1417 * The pthread cancellation handler is now installed with SA_RESTART and
1418 pthread_cancel will always send the internal SIGCANCEL on a cancellation
1419 request. It should not be visible to applications since the cancellation
1420 handler should either act upon cancellation (if asynchronous cancellation
1421 is enabled) or ignore the cancellation internal signal. However there are
1422 buggy kernel interfaces (for instance some CIFS versions) that could still
1423 see a spurious EINTR error when cancellation interrupts a blocking syscall.
1425 * Previously, glibc installed its various shared objects under versioned
1426 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
1427 were provided as symbolic links. Starting with glibc 2.34, the shared
1428 objects are installed under their ABI sonames directly, without
1429 symbolic links. This increases compatibility with distribution
1430 package managers that delete removed files late during the package
1431 upgrade or downgrade process.
1433 * The symbols mallwatch and tr_break are now deprecated and no longer used in
1434 mtrace. Similar functionality can be achieved by using conditional
1435 breakpoints within mtrace functions from within gdb.
1437 * The __morecore and __after_morecore_hook malloc hooks and the default
1438 implementation __default_morecore have been removed from the API. Existing
1439 applications will continue to link against these symbols but the interfaces
1440 no longer have any effect on malloc.
1442 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
1443 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
1444 disabled by default in the main C library. Users looking to use these
1445 features now need to preload a new debugging DSO libc_malloc_debug.so to get
1446 this functionality back.
1448 * The deprecated functions malloc_get_state and malloc_set_state have been
1449 moved from the core C library into libc_malloc_debug.so. Legacy applications
1450 that still use these functions will now need to preload libc_malloc_debug.so
1451 in their environment using the LD_PRELOAD environment variable.
1453 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
1454 __memalign_hook and __free_hook are now removed from the API. Compatibility
1455 symbols are present to support legacy programs but new applications can no
1456 longer link to these symbols. These hooks no longer have any effect on glibc
1457 functionality. The malloc debugging DSO libc_malloc_debug.so currently
1458 supports hooks and can be preloaded to get this functionality back for older
1459 programs. However this is a transitional measure and may be removed in a
1460 future release of the GNU C Library. Users may port away from these hooks by
1461 writing and preloading their own malloc interposition library.
1463 Changes to build and runtime requirements:
1465 * On Linux, the shm_open, sem_open, and related functions now expect the
1466 file shared memory file system to be mounted at /dev/shm. These functions
1467 no longer search among the system's mount points for a suitable
1468 replacement if /dev/shm is not available.
1470 Security related changes:
1472 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1473 a request for netgroup lookup, may crash due to a double-free,
1474 potentially resulting in degraded service or Denial of Service on the
1475 local system. Reported by Chris Schanzle.
1477 CVE-2021-33574: The mq_notify function has a potential use-after-free
1478 issue when using a notification type of SIGEV_THREAD and a thread
1479 attribute with a non-default affinity mask.
1481 CVE-2021-35942: The wordexp function may overflow the positional
1482 parameter number when processing the expansion resulting in a crash.
1483 Reported by Philippe Antoine.
1485 The following bugs are resolved with this release:
1487 [4737] libc: fork is not async-signal-safe
1488 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1489 [10353] libc: Methods for deleting all file descriptors greater than
1490 given integer (closefrom)
1491 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1492 name containing multi-byte character(s)
1493 [14469] math: Inaccurate j0f function
1494 [14470] math: Inaccurate j1f function
1495 [14471] math: Inaccurate y0f function
1496 [14472] math: Inaccurate y1f function
1497 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1499 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1500 crashes if it fails dlsym() twice
1501 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1502 [16063] nptl: Provide a pthread_once variant in libc directly
1503 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1504 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1505 [17183] manual: description of ENTRY struct in <search.h> in glibc
1507 [18435] nptl: pthread_once hangs when init routine throws an exception
1508 [18524] nptl: Missing calloc error checking in
1509 __cxa_thread_atexit_impl
1510 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1511 pthread_create and dlopen
1512 [19366] nptl: returning from a thread should disable cancellation
1513 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1514 when non-root user changes priority
1515 [20802] dynamic-link: getauxval NULL pointer dereference after static
1517 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1518 [22057] malloc: malloc_usable_size is broken with mcheck
1519 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1521 [23323] libc: [RFE] CSU startup hardening.
1522 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1524 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1525 $PLATFORM, $ORIGIN) crashes
1526 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1527 [23554] nptl: pthread_getattr_np reports wrong stack size with
1529 [24106] libc: Bash interpreter in ldd script is taken from host
1530 [24773] dynamic-link: dlerror in an secondary namespace does not use
1531 the right free implementation
1532 [25036] localedata: Update collation order for Swedish
1533 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1534 shm_open to pick wrong directory
1535 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1536 crash in IFUNC resolver due to stack canary (--enable-stack-
1538 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1539 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1540 [27111] dynamic-link: pthread_create and tls access use link_map
1541 objects that may be concurrently freed by dlclose
1542 [27132] malloc: memusagestat is linked to system librt, leading to
1543 undefined symbols on major version upgrade
1544 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1546 [27249] libc: libSegFault.so does not output signal number properly
1547 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1549 [27318] dynamic-link: glibc fails to load binaries when built with
1550 -march=sandybridge: CPU ISA level is lower than required
1551 [27343] nss: initgroups() SIGSEGVs when called on a system without
1552 nsswich.conf (in a chroot)
1553 [27346] dynamic-link: x86: PTWRITE feature check is missing
1554 [27389] network: NSS chroot hardening causes regressions in chroot
1556 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1557 [27444] libc: sysconf reports unsupported option (-1) for
1558 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1559 [27462] nscd: double-free in nscd (CVE-2021-27645)
1560 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1561 malloc/tst-malloc-thread-fail
1562 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1563 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1565 [27522] glob: glob, glob64 incorrectly marked as __THROW
1566 [27555] dynamic-link: Static tests fail with --enable-stack-
1568 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1569 information for the current directory
1570 [27577] dynamic-link: elf/ld.so --help doesn't work
1571 [27605] libc: tunables can't control xsave/xsavec selection in
1572 dl_runtime_resolve_*
1573 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1574 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1576 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1577 _nss_files_getcanonname_r) from within a dlmopen namespace.
1578 [27648] libc: FAIL: misc/tst-select
1579 [27650] stdio: vfscanf returns too early if a match is longer than
1581 [27651] libc: Performance regression after updating to 2.33
1582 [27655] string: Wrong size calculation in string/test-strnlen.c
1583 [27706] libc: select fails to update timeout on error
1584 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1585 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1586 tries resolving them lazily
1587 [27744] nptl: Support different libpthread/ld.so load orders in
1589 [27749] libc: Data race __run_exit_handlers
1590 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1592 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1593 exceeds maximum object size 2147483647
1594 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1596 [27872] build: Obsolete configure option --enable-stackguard-
1598 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1599 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1600 [27892] libc: powerpc: scv ABI error handling fails to check
1602 [27896] nptl: mq_notify does not handle separately allocated thread
1603 attributes (CVE-2021-33574)
1604 [27901] libc: TEST_STACK_ALIGN doesn't work
1605 [27902] libc: The x86-64 clone wrapper fails to align child stack
1606 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1607 [27939] libc: aarch64: clone does not align the stack
1608 [27968] libc: s390x: clone does not align the stack
1609 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1610 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1611 with n >= 0x80000000
1612 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1613 thread never allocated anything
1614 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1615 [28064] string: x86_64:wcslen implementation list has wcsnlen
1616 [28067] libc: FAIL: posix/tst-spawn5
1617 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1618 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1620 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1621 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1622 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1624 [28091] network: ns_name_skip may return 0 for domain names without
1632 * The dynamic linker accepts the --list-tunables argument which prints
1633 all the supported tunables. This option is disable if glibc is
1634 configured with tunables disabled (--enable-tunables=no).
1636 * The dynamic linker accepts the --argv0 argument and provides opportunity
1637 to change argv[0] string.
1639 * The dynamic linker loads optimized implementations of shared objects
1640 from subdirectories under the glibc-hwcaps directory on the library
1641 search path if the system's capabilities meet the requirements for
1642 that subdirectory. Initially supported subdirectories include
1643 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1644 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1645 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1646 subdirectory names correspond to the vendor-independent x86-64
1647 microarchitecture levels defined in the x86-64 psABI supplement.
1649 * The new --help option of the dynamic linker provides usage and
1650 information and library search path diagnostics.
1652 * The mallinfo2 function is added to report statistics as per mallinfo,
1653 but with larger field widths to accurately report values that are
1654 larger than fit in an integer.
1656 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1658 * Support for the RISC-V ISA running on Linux has been expanded to run on
1659 32-bit hardware. This is supported for the following ISA and ABI pairs:
1665 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1668 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1669 glibc may use additional checks that may have an additional performance
1670 overhead. At present these checks are available only on LLVM 9 and later.
1671 The latest GCC available at this time (10.2) does not support this level of
1674 Deprecated and removed features, and other changes affecting compatibility:
1676 * The mallinfo function is marked deprecated. Callers should call
1679 * When dlopen is used in statically linked programs, alternative library
1680 implementations from HWCAP subdirectories are no longer loaded.
1681 Instead, the default implementation is used.
1683 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1684 removed. To support old binaries, the vtimes function continues to exist
1685 as a compatibility symbol. Applications should use the getrlimit or
1688 * Following a change in the tzdata 2018a release upstream, the zdump
1689 program is now installed in the /usr/bin subdirectory. Previously,
1690 the /usr/sbin subdirectory was used.
1692 * On s390(x), the type float_t is now derived from the macro
1693 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1694 hardcoded to double. This does not affect the ABI of any libraries
1695 that are part of the GNU C Library, but may affect the ABI of other
1696 libraries that use this type in their interfaces. The new definition
1697 improves consistency with compiler behavior in many scenarios.
1699 * A future version of glibc will stop loading shared objects from the
1700 "tls" subdirectories on the library search path, the subdirectory that
1701 corresponds to the AT_PLATFORM system name, and also stop employing
1702 the legacy AT_HWCAP search mechanism. Applications should switch to
1703 the new glibc-hwcaps mechanism instead; if they do not do that, only
1704 the baseline version (directly from the search path directory) will be
1707 Changes to build and runtime requirements:
1709 * On Linux, the system administrator needs to configure /dev/pts with
1710 the intended access modes for pseudo-terminals. glibc no longer
1711 attempts to adjust permissions of terminal devices. The previous glibc
1712 defaults ("tty" group, user read/write and group write) already
1713 corresponded to what most systems used, so that grantpt did not
1714 perform any adjustments.
1716 * On Linux, the posix_openpt and getpt functions no longer attempt to
1717 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1718 (and pseudo-terminals are supported), a devpts file system is mounted
1719 on /dev/pts. Current systems already meet these requirements.
1721 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1723 Security related changes:
1725 CVE-2021-3326: An assertion failure during conversion from the
1726 ISO-20220-JP-3 character set using the iconv function has been fixed.
1727 This assertion was triggered by certain valid inputs in which the
1728 converted output contains a combined sequence of two wide characters
1729 crossing a buffer boundary. Reported by Tavis Ormandy.
1731 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1732 invoked with input containing redundant shift sequences in the IBM1364,
1733 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1735 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1736 when invoked with UCS4 input containing an invalid character.
1738 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1739 invoked with EUC-KR input containing invalid multibyte input sequences.
1741 The following bugs are resolved with this release:
1743 [10635] libc: realpath portability patches
1744 [16124] dynamic-link: ld.so should allow to change argv[0]
1745 [17924] malloc: 'free' should not set errno
1746 [18683] libc: Linux faccessat implementation can incorrectly ignore
1748 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1749 [23091] hurd: missing waitid support
1750 [23249] libc: Epyc and other current AMD CPUs do not select the
1751 "haswell" platform subdirectory
1752 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1754 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1756 [24941] libc: Make grantpt usable after multi-threaded fork in more
1758 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1759 [24973] locale: iconv encounters segmentation fault when converting
1760 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1761 [25399] string: undefined reference to `__warn_memset_zero_len' when
1762 changing gnuc version
1763 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1765 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1767 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1768 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1769 [26100] libc: Race in syslog(3) with regards to tag printing.
1770 [26124] libc: Export <cpu-features.h>
1771 [26130] nscd: Inconsistent nscd cache during pruning
1772 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1773 [26224] locale: iconv hangs when converting some invalid inputs from
1774 several IBM character sets (CVE-2020-27618)
1775 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1776 too much stack space
1777 [26343] manual: invalid documented return type for strerrorname_np(),
1778 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1779 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1781 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1783 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1784 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1786 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1787 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1788 [26555] string: strerrorname_np does not return the documented value
1789 [26592] libc: pointer arithmetic overflows in realpath
1790 [26600] network: Transaction ID collisions cause slow DNS lookups in
1792 [26606] libc: [2.33 Regression] pselect is broken on x32
1793 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1794 [26620] glob: fnmatch with collating symbols results in segmentation
1796 [26625] libc: [2.33 Regression] CET is disabled
1797 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1798 at the end of a memory mapping
1799 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1800 by the caller to the kernel
1801 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1802 [26647] build: [-Werror=array-parameter=] due to different
1803 declarations for __sigsetjmp
1804 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1806 [26649] stdio: printf should handle non-normal x86 long double numbers
1807 gracefully (CVE-2020-29573)
1808 [26686] build: -Warray-parameter instances building with GCC 11
1809 [26687] build: -Warray-bounds instances building with GCC 11
1810 [26690] stdio: Aliasing violation in __vfscanf_internal
1811 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1812 [26726] build: GCC warning calling new_composite_name with an array of
1814 [26736] libc: FAIL: misc/tst-sysvshm-linux
1815 [26737] libc: Random FAIL: rt/tst-shm
1816 [26791] libc: Missing O_CLOEXEC in sysconf.c
1817 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1819 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1821 [26818] string: aarch64: string tests may run ifunc variants that are
1823 [26821] libc: Memory leak test failures on Fedora 33
1824 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1825 FSGSBASE/LM/RDRAND check failure
1826 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1828 [26853] libc: aarch64: Missing unwind information in statically linked
1830 [26923] locale: Assertion failure in iconv when converting invalid
1831 UCS4 (CVE-2020-29562)
1832 [26926] dynamic-link: aarch64: library dependencies are not bti
1834 [26932] libc: sh: Multiple floating point functions defined as stubs
1836 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1838 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1840 [27002] build: libc_freeres_fn build failure with GCC 11
1841 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1842 [27008] dynamic-link: ld.so.cache should have endianness markup
1843 [27042] libc: [alpha] anonymous union in struct stat confuses
1845 [27053] libc: Conformance regression in system(3) (and probably also
1847 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1849 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1850 [27083] libc: Unsafe unbounded alloca in addmntent
1851 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1853 [27130] string: "rep movsb" performance issue
1854 [27150] libc: alpha: wait4() is unavailable in static linking
1855 [27177] dynamic-link:
1856 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1858 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1859 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1860 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1861 related to combining characters (CVE-2021-3326)
1868 * Unicode 13.0.0 Support: Character encoding, character type info, and
1869 transliteration tables are all updated to Unicode 13.0.0, using
1870 generator scripts contributed by Mike FABIAN (Red Hat).
1872 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1874 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1875 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1876 Three ABIs are supported:
1882 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1883 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1885 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1886 DT_DEPAUDIT dynamic section entries of the main executable.
1888 * powerpc64le supports IEEE128 long double libm/libc redirects when
1889 using -mabi=ieeelongdouble to compile C code on supported GCC
1890 toolchains. It is recommended to use GCC 8 or newer when testing
1893 * To help detect buffer overflows and other out-of-bounds accesses
1894 several APIs have been annotated with GCC 'access' attribute. This
1895 should help GCC 10 issue better warnings.
1897 * On Linux, functions pthread_attr_setsigmask_np and
1898 pthread_attr_getsigmask_np have been added. They allow applications
1899 to specify the signal mask of a thread created with pthread_create.
1901 * The GNU C Library now provides the header file <sys/single_threaded.h>
1902 which declares the variable __libc_single_threaded. Applications are
1903 encouraged to use this variable for single-thread optimizations,
1904 instead of weak references to symbols historically defined in
1907 * The functions sigabbrev_np and sigdescr_np have been added. The
1908 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1909 SIGHUP) while sigdescr_np returns a string describing the signal number
1910 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1911 attempt to translate the return description, both functions return
1912 NULL for an invalid signal number.
1914 They should be used instead of sys_siglist or sys_sigabbrev and they
1915 are both thread and async-signal safe. These functions are GNU extensions.
1917 * The functions strerrorname_np and strerrordesc_np have been added. The
1918 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1919 while strerrordesc_np returns a string describing the error number
1920 (e.g "Invalid argument" for EINVAL). Different than strerror,
1921 strerrordesc_np does not attempt to translate the return description, both
1922 functions return NULL for an invalid error number.
1924 They should be used instead of sys_errlist and sys_nerr, both are
1925 thread and async-signal safe. These functions are GNU extensions.
1927 * AArch64 now supports standard branch protection security hardening
1928 in glibc when it is built with a GCC that is configured with
1929 --enable-standard-branch-protection (or if -mbranch-protection=standard
1930 flag is passed when building both GCC target libraries and glibc,
1931 in either case a custom GCC is needed). This includes branch target
1932 identification (BTI) and pointer authentication for return addresses
1933 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1934 extensions respectively for the protection to be effective,
1935 otherwise the used instructions are nops. User code can use PAC-RET
1936 without libc support, but BTI requires a libc that is built with BTI
1937 support, otherwise runtime objects linked into user code will not be
1940 Deprecated and removed features, and other changes affecting compatibility:
1942 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1943 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1944 RPC header files. Backward compatibility for old programs is kept
1945 only for architectures and ABIs that have been added in or before
1946 glibc 2.31. New programs need to use TI-RPC
1947 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1948 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1950 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1951 as shared library for backward compatibility and the NSS modules "nis"
1952 and "nisplus" are not built at all and libnsl's headers aren't
1953 installed. This compatibility is kept only for architectures and ABIs
1954 that have been added in or before version 2.28. Replacement
1955 implementations based on TI-RPC, which additionally support IPv6, are
1956 available from <https://github.com/thkukuk/>. This change does not
1957 affect the "compat" NSS module, which does not depend on libnsl
1958 since 2.27 and thus can be used without NIS.
1960 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1961 removed. To support old binaries, the sysctl function continues to
1962 exist as a compatibility symbol (on those architectures which had it),
1963 but always fails with ENOSYS. This reflects the removal of the system
1964 call from all architectures, starting with Linux 5.5.
1966 * The sstk function is no longer available to newly linked binaries.
1967 Its implementation always returned with a failure, and the function
1968 was not declared in any header file.
1970 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1971 sigrelse, sigignore and sigset, and the sigmask macro have been
1972 deprecated. Applications should use the sigsuspend, sigprocmask and
1973 sigaction functions instead.
1975 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1976 already supported this format for almost 20 years.
1978 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1979 are no longer available to newly linked binaries, and their declarations
1980 have been removed from <string.h>. They are exported solely as
1981 compatibility symbols to support old binaries. All programs should use
1984 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1985 are no longer available to newly linked binaries, and their declarations
1986 have been removed from <stdio.h>. They are exported solely as
1987 compatibility symbols to support old binaries. All programs should use
1988 strerror or strerror_r instead.
1990 * Both strerror and strerror_l now share the same internal buffer in the
1991 calling thread, meaning that the returned string pointer may be invalided
1992 or contents might be overwritten on subsequent calls in the same thread or
1993 if the thread is terminated. It makes strerror MT-safe.
1995 * Using weak references to libpthread functions such as pthread_create
1996 or pthread_key_create to detect the singled-threaded nature of a
1997 program is an obsolescent feature. Future versions of glibc will
1998 define pthread_create within libc.so.6 itself, so such checks will
1999 always flag the program as multi-threaded. Applications should check
2000 the __libc_single_threaded variable declared in
2001 <sys/single_threaded.h> instead.
2003 * The "files" NSS module no longer supports the "key" database (used for
2004 secure RPC). The contents of the /etc/publickey file will be ignored,
2005 regardless of the settings in /etc/nsswitch.conf. (This method of
2006 storing RPC keys only supported the obsolete and insecure AUTH_DES
2007 flavor of secure RPC.)
2009 * The __morecore and __after_morecore_hook malloc hooks and the default
2010 implementation __default_morecore have been deprecated. Applications
2011 should use malloc interposition to change malloc behavior, and mmap to
2012 allocate anonymous memory. A future version of glibc may require that
2013 applications which use the malloc hooks must preload a special shared
2014 object, to enable the hooks.
2016 * The hesiod NSS module has been deprecated and will be removed in a
2017 future version of glibc. System administrators are encouraged to
2018 switch to other approaches for networked account databases, such as
2021 Changes to build and runtime requirements:
2023 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
2024 long double redirects.
2026 Security related changes:
2028 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
2029 invoked with the -c option and when processing invalid multi-byte input
2030 sequences. Reported by Jan Engelhardt.
2032 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
2033 corruption when they were passed a pseudo-zero argument. Reported by Guido
2034 Vranken / ForAllSecure Mayhem.
2036 CVE-2020-1752: A use-after-free vulnerability in the glob function when
2037 expanding ~user has been fixed.
2039 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
2040 memmove functions has been fixed. Discovered by Jason Royes and Samual
2041 Dytrych of the Cisco Security Assessment and Penetration Team (See
2044 The following bugs are resolved with this release:
2046 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
2047 [10441] manual: Backtraces code example lacks error checking
2048 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
2049 timer_sigev_thread dangerous
2050 [14231] stdio: stdio-common tests memory requirements
2051 [14578] libc: /proc-based emulation for lchmod, fchmodat
2052 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
2053 filtee has constructor
2054 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
2055 sequences (CVE-2016-10228)
2056 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
2057 character entities for infinity & pi
2058 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
2059 segfaults in applications
2060 [20543] libc: Please move from .gnu.linkonce to comdat
2061 [22489] network: gcc warns about implicit conversion in
2062 ICMP6_FILTER_SETPASS with -Wsign-conversion
2063 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
2064 [23294] math: Complex _FloatN functions are redirected to the wrong
2065 function with -mlong-double-64
2066 [23296] libc: Data race in setting function descriptor during lazy
2068 [23668] dynamic-link: ldconfig: Default to the new format for
2070 [23819] hurd: hurd: Add C11 thread support
2071 [23990] build: test-container error out on failure to exec child.
2072 [23991] build: shell-container typo in run_command_array
2073 [24638] manual: Error in example of parsing a template string
2074 [24654] manual: Wrong declaration of wcschr in libc manual
2075 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
2077 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
2078 dynamically loaded dsos
2079 [25098] nptl: nptl: ctype classification functions are not AS-Safe
2080 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
2082 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
2083 restore EAX, ECX and EDX
2084 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
2085 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
2086 [25420] network: Race condition in resolv_conf.c can result in caching
2087 stale configuration forever
2088 [25487] math: sinl() stack corruption from crafted input
2090 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
2092 [25523] libc: MIPS/Linux inline syscall template is miscompiled
2093 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
2095 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
2096 on 32 bit and old kernel
2097 [25635] libc: arm: Wrong sysdep order selection for soft-fp
2098 [25639] localedata: Some names of days and months wrongly spelt in
2100 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
2101 amount of sigset_t bytes
2102 [25691] stdio: printf: memory leak when printing long multibyte
2104 [25715] libc: system() returns wrong errors when posix_spawn fails
2105 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
2106 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
2107 state for conversions that produce two Unicode code points
2108 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
2109 for linux x86_64 leads to livelock
2110 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
2111 test failures, invalid instruction in ld.so
2112 [25790] glob: Typo in tst-fnmatch.input
2113 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
2115 [25819] localedata: Update locale data to Unicode 13.0.0
2116 [25824] libc: Abnormal function of strnlen in aarch64
2117 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
2118 [25896] libc: Incorrect prctl
2119 [25902] libc: Bad LOADARGS_N
2120 [25905] dynamic-link: VSX registers are corrupted during PLT
2121 resolution when glibc is built with --disable-multi-arch and --with-
2123 [25933] string: Off by one error in __strncmp_avx2 when
2124 length=VEC_SIZE*4 and strings are at page boundaries can cause a
2126 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
2127 exiting detached thread
2128 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
2130 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
2132 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
2133 [26073] math: getpayload() has wrong return value
2134 [26076] dynamic-link: dlmopen crashes after failing to load
2135 dependencies in audit mode
2136 [26120] localedata: column width of of some Korean
2137 JUNGSEONG/JONGSEONG characters wrong (should be 0)
2138 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
2139 [26133] libc: Incorrect need_arch_feature_F16C
2140 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
2142 [26149] libc: PKU is usable only if OSPKE is set
2143 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
2145 [26208] libc: Incorrect bit_cpu_CLFSH
2146 [26210] network: Incorrect use of hidden symbols for global sunrpc
2148 [26211] stdio: printf integer overflow calculating allocation size
2149 [26214] stdio: printf_fp double free
2150 [26215] stdio: printf_fp memory leak
2151 [26232] time: FAIL: support/tst-timespec for 32-bit targets
2152 [26258] nss: nss_compat should not read input files with mmap
2153 [26332] string: Incorrect cache line size load causes memory
2154 corruption in memset
2161 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
2162 enable features from the draft ISO C2X standard. Only some features from
2163 this draft standard are supported by the GNU C Library, and as the draft
2164 is under active development, the set of features enabled by this macro is
2165 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
2166 by compiling with "gcc -std=gnu2x".
2168 * The <math.h> functions that round their results to a narrower type now
2169 have corresponding type-generic macros in <tgmath.h>, as defined in TS
2170 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
2171 Clarification Request 13 to TS 18661-3.
2173 * The function pthread_clockjoin_np has been added, enabling join with a
2174 terminated thread with a specific clock. It allows waiting against
2175 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
2177 * New locale added: mnw_MM (Mon language spoken in Myanmar).
2179 * The DNS stub resolver will optionally send the AD (authenticated data) bit
2180 in queries if the trust-ad option is set via the options directive in
2181 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
2182 mode, the AD bit, as provided by the name server, is available to
2183 applications which call res_search and related functions. In the default
2184 mode, the AD bit is not set in queries, and it is automatically cleared in
2185 responses, indicating a lack of DNSSEC validation. (Therefore, the name
2186 servers and the network path to them are treated as untrusted.)
2188 Deprecated and removed features, and other changes affecting compatibility:
2190 * The totalorder and totalordermag functions, and the corresponding
2191 functions for other floating-point types, now take pointer arguments to
2192 avoid signaling NaNs possibly being converted to quiet NaNs in argument
2193 passing. This is in accordance with the resolution of Clarification
2194 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
2195 floating-point arguments directly will continue to work.
2197 * The obsolete function stime is no longer available to newly linked
2198 binaries, and its declaration has been removed from <time.h>.
2199 Programs that set the system time should use clock_settime instead.
2201 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
2202 in a future version of glibc. In this release, the header still exists
2203 but calling ftime will cause a compiler warning. All programs should use
2204 gettimeofday or clock_gettime instead.
2206 * The gettimeofday function no longer reports information about a
2207 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
2208 many years, as it cannot handle the full complexity of the world's
2209 timezones, but hitherto we have supported it on a best-effort basis.
2210 Changes required to support 64-bit time_t on 32-bit architectures have
2211 made this no longer practical.
2213 As of this release, callers of gettimeofday with a non-null 'tzp' argument
2214 should expect to receive a 'struct timezone' whose tz_minuteswest and
2215 tz_dsttime fields are zero. (For efficiency reasons, this does not always
2216 happen on a few Linux-based ports. This will be corrected in a future
2219 All callers should supply a null pointer for the 'tzp' argument to
2220 gettimeofday. For accurate information about the time zone associated
2221 with the current time, use the localtime function.
2223 gettimeofday itself is obsolescent according to POSIX. We have no plans
2224 to remove access to this function, but portable programs should consider
2225 using clock_gettime instead.
2227 * The settimeofday function can still be used to set a system-wide time
2228 zone when the operating system supports it. This is because the Linux
2229 kernel reused the API, on some architectures, to describe a system-wide
2230 time-zone-like offset between the software clock maintained by the kernel,
2231 and the "RTC" clock that keeps time when the system is shut down.
2233 However, to reduce the odds of this offset being set by accident,
2234 settimeofday can no longer be used to set the time and the offset
2235 simultaneously. If both of its two arguments are non-null, the call
2236 will fail (setting errno to EINVAL).
2238 Callers attempting to set this offset should also be prepared for the call
2239 to fail and set errno to ENOSYS; this already happens on the Hurd and on
2240 some Linux architectures. The Linux kernel maintainers are discussing a
2241 more principled replacement for the reused API. After a replacement
2242 becomes available, we will change settimeofday to fail with ENOSYS on all
2243 platforms when its 'tzp' argument is not a null pointer.
2245 settimeofday itself is obsolescent according to POSIX. Programs that set
2246 the system time should use clock_settime and/or the adjtime family of
2247 functions instead. We may cease to make settimeofday available to newly
2248 linked binaries after there is a replacement for Linux's time-zone-like
2251 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
2252 the optional CAS instruction is implemented (for instance, LEON processors
2253 are still supported, but SuperSPARC processors are not).
2255 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
2258 * If a lazy binding failure happens during dlopen, during the execution of
2259 an ELF constructor, the process is now terminated. Previously, the
2260 dynamic loader would return NULL from dlopen, with the lazy binding error
2261 captured in a dlerror message. In general, this is unsafe because
2262 resetting the stack in an arbitrary function call is not possible.
2264 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
2265 executable stack unless explicitly configured at build time to require
2266 minimum kernel version 4.8 or newer. This is because executing
2267 floating-point branches on a non-executable stack on Linux kernels prior to
2268 4.8 can lead to application crashes for some MIPS configurations. While
2269 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
2270 expected to enable non-executable stack by default with PT_GNU_STACK by
2271 default and is thus likely to trigger a crash on older kernels.
2273 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
2274 non-executable stack while dropping support for older kernels.
2276 * System call wrappers for time system calls now use the new time64 system
2277 calls when available. On 32-bit targets, these wrappers attempt to call
2278 the new system calls first and fall back to the older 32-bit time system
2279 calls if they are not present. This may cause issues in environments
2280 that cannot handle unsupported system calls gracefully by returning
2281 -ENOSYS. Seccomp sandboxes are affected by this issue.
2283 Changes to build and runtime requirements:
2285 * It is no longer necessary to have recent Linux kernel headers to build
2286 working (non-stub) system call wrappers on all architectures except 64-bit
2287 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
2289 * The ChangeLog file is no longer present in the toplevel directory of the
2290 source tree. ChangeLog files are located in the ChangeLog.old directory as
2291 ChangeLog.N where the highest N has the latest entries.
2293 Security related changes:
2295 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
2296 out-of-bounds write when executed in a signal frame context.
2298 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
2299 environment variable during program execution after a security
2300 transition, allowing local attackers to restrict the possible mapping
2301 addresses for loaded libraries and thus bypass ASLR for a setuid
2302 program. Reported by Marcin Kościelnicki.
2304 The following bugs are resolved with this release:
2306 [12031] localedata: iconv -t ascii//translit with Greek characters
2307 [15813] libc: Multiple issues in __gen_tempname
2308 [17726] libc: [arm, sparc] profil_counter should be compat symbol
2309 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
2310 [19767] libc: vdso is not used with static linking
2311 [19903] hurd: Shared mappings not being inherited by children processes
2312 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
2313 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
2315 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
2316 Symbols-A/B Unicode blocks
2317 [23518] libc: Eliminate __libc_utmp_jump_table
2318 [24026] malloc: malloc_info() returns wrong numbers
2319 [24054] localedata: Many locales are missing date_fmt
2320 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
2321 [24304] dynamic-link: Lazy binding failure during ELF
2322 constructors/destructors is not fatal
2323 [24376] libc: RISC-V symbol size confusion with _start
2324 [24682] localedata: zh_CN first weekday should be Monday per GB/T
2326 [24824] libc: test-in-container does not install charmap files compatible
2328 [24844] regex: regex bad pointer / leakage if malloc fails
2329 [24867] malloc: Unintended malloc_info formatting changes
2330 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
2331 [24880] libc: login: utmp implementation uses struct flock with fcntl64
2332 [24882] libc: login: pututline uses potentially outdated cache
2333 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
2334 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
2336 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
2338 [24930] dynamic-link: dlopen of PIE executable can result in
2339 _dl_allocate_tls_init assertion failure
2340 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
2341 (stringop-overflow error)
2342 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
2343 functions other can lead to crashes
2344 [24967] libc: jemalloc static linking causes runtime failure
2345 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
2347 [25035] libc: sbrk() failure handled poorly in tunables_strdup
2348 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
2349 [25097] libc: new -Warray-bounds with GCC 10
2350 [25112] dynamic-link: dlopen must not make new objects accessible when it
2351 still can fail with an error
2352 [25139] localedata: Please add the new mnw_MM locale
2353 [25149] regex: Array bounds violation in proceed_next_node
2354 [25157] dynamic-link: Audit cookie for the dynamic loader is not
2355 initialized correctly
2356 [25189] libc: glibc's __glibc_has_include causes issues with clang
2358 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
2359 value to an unsigned
2360 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
2361 binaries (CVE-2019-19126)
2362 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
2364 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
2366 [25232] string: <string.h> does not enable const correctness for strchr et
2368 [25233] localedata: Consider "." as the thousands separator for sl_SI
2370 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
2371 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
2372 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
2374 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
2375 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
2377 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
2378 (dl_initfirst) link map pointer
2379 [25401] malloc: pvalloc must not have __attribute_alloc_size__
2380 [25423] libc: Array overflow in backtrace on powerpc
2381 [25425] network: Missing call to __resolv_context_put in
2382 getaddrinfo.c:gethosts
2389 * Unicode 12.1.0 Support: Character encoding, character type info, and
2390 transliteration tables are all updated to Unicode 12.1.0, using
2391 generator scripts contributed by Mike FABIAN (Red Hat).
2393 * The dynamic linker accepts the --preload argument to preload shared
2394 objects, in addition to the LD_PRELOAD environment variable.
2396 * The twalk_r function has been added. It is similar to the existing
2397 twalk function, but it passes an additional caller-supplied argument
2398 to the callback function.
2400 * On Linux, the getdents64, gettid, and tgkill functions have been added.
2402 * Minguo (Republic of China) calendar support has been added as an
2403 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
2406 * The entry for the new Japanese era has been added for ja_JP locale.
2408 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
2409 pvalloc, memalign, and posix_memalign fail now with total object size
2410 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
2411 pointer subtraction within the allocated object, where results might
2412 overflow the ptrdiff_t type.
2414 * The dynamic linker no longer refuses to load objects which reference
2415 versioned symbols whose implementation has moved to a different soname
2416 since the object has been linked. The old error message, symbol
2417 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
2418 link time reference, is gone.
2420 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
2421 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
2422 functions. These behave similarly to their "timed" equivalents, but also
2423 accept a clockid_t parameter to determine which clock their timeout should
2424 be measured against. All functions allow waiting against CLOCK_MONOTONIC
2425 and CLOCK_REALTIME. The decision of which clock to be used is made at the
2426 time of the wait (unlike with pthread_condattr_setclock, which requires
2427 the clock choice at initialization time).
2429 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
2430 work, new resolvers can use a second argument which can be extended in
2431 the future, currently it contains the AT_HWCAP2 value.
2433 Deprecated and removed features, and other changes affecting compatibility:
2435 * The copy_file_range function fails with ENOSYS if the kernel does not
2436 support the system call of the same name. Previously, user space
2437 emulation was performed, but its behavior did not match the kernel
2438 behavior, which was deemed too confusing. Applications which use the
2439 copy_file_range function can no longer rely on glibc to provide a fallback
2440 on kernels that do not support the copy_file_range system call, and if
2441 this function returns ENOSYS, they will need to use their own fallback.
2442 Support for copy_file_range for most architectures was added in version
2443 4.5 of the mainline Linux kernel.
2445 * The functions clock_gettime, clock_getres, clock_settime,
2446 clock_getcpuclockid, clock_nanosleep were removed from the librt library
2447 for new applications (on architectures which had them). Instead, the
2448 definitions in libc will be used automatically, which have been available
2451 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
2452 and <sys/stropts.h> have been removed.
2454 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
2455 resolver flag (deprecated in glibc 2.25) have been removed.
2457 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
2458 resolver have been removed from <resolv.h>.
2460 * With --enable-bind-now, installed programs are now linked with the
2463 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
2464 configurations) has been removed, following the deprecation of this
2465 subarchitecture in version 8 of GCC, and its removal in version 9.
2467 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2468 header have been removed.
2470 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2471 deprecated and will be removed from a future version of glibc.
2472 Application should directly access /proc instead. For obtaining random
2473 bits, the getentropy function can be used.
2475 Changes to build and runtime requirements:
2477 * GCC 6.2 or later is required to build the GNU C Library.
2479 Older GCC versions and non-GNU compilers are still supported when
2480 compiling programs that use the GNU C Library.
2482 Security related changes:
2484 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2485 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2486 has undefined behavior. On x32, the size_t argument may be passed
2487 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2488 32 bits. When it happened with the sign bit of RDX register set,
2489 memcmp gave the wrong result since it treated the size argument as
2490 zero. Reported by H.J. Lu.
2492 CVE-2019-9169: Attempted case-insensitive regular-expression match
2493 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2494 over-read. Reported by Hongxu Chen.
2496 The following bugs are resolved with this release:
2498 [2872] locale: Transliteration Cyrillic -> ASCII fails
2499 [6399] libc: gettid() should have a wrapper
2500 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2501 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2502 [17396] localedata: globbing for locale by [[.collating-element.]]
2503 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2504 [18465] malloc: memusagestat is built using system C library
2505 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2506 invalid input drops valid char
2507 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2508 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2509 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2510 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2511 [23352] malloc: __malloc_check_init still defined in public header
2513 [23403] nptl: Wrong alignment of TLS variables
2514 [23501] libc: nftw() doesn't return dangling symlink's inode
2515 [23733] malloc: Check the count before calling tcache_get()
2516 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2518 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2519 [23844] nptl: pthread_rwlock_trywrlock results in hang
2520 [23983] argparse: Missing compat versions of argp_failure and argp_error
2521 for long double = double
2522 [23984] libc: Missing compat versions of err.h and error.h functions for
2523 long double = double
2524 [23996] localedata: Dutch salutations
2525 [24040] libc: riscv64: unterminated call chain in __thread_start
2526 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2528 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2529 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2531 [24114] regex: regexec buffer read overrun in "grep -i
2532 '\(\(\)*.\)*\(\)\(\)\1'"
2533 [24122] libc: Segfaults if 0 returned from la_version
2534 [24153] stdio: Some input functions do not react to stdin assignment
2535 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2536 RDX is set) (CVE-2019-7309)
2537 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2538 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2539 not the default "nor"
2540 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2541 false positives, change to modern flexible array
2542 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2543 instructions while maintaining the robust mutex list due to missing
2545 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2546 unnecessary librt dependencies
2547 [24200] localedata: Revert first_weekday removal in en_IE locale
2548 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2549 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2550 [24216] malloc: Check for large bin list corruption when inserting
2552 [24228] stdio: old x86 applications that use legacy libio crash on exit
2553 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2555 [24293] localedata: Missing Minguo calendar support for TW locales
2556 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2557 tt_RU (Tatar) locale
2558 [24307] localedata: Update locale data to Unicode 12.0.0
2559 [24323] dynamic-link: dlopen should not be able open PIE objects
2560 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2561 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2562 tt_RU (Tatar) locale
2563 [24370] localedata: Add lang_name for tt_RU locale
2564 [24372] locale: Binary locale files are not architecture independent
2565 [24394] time: strptime %Ey mis-parses final year of era
2566 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2568 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2570 [24531] malloc: Malloc tunables give tcache assertion failures
2571 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2573 [24535] localedata: Update locale data to Unicode 12.1.0
2574 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2575 kernels and break testing
2576 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2577 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2578 [-Werror=format-overflow=]
2579 [24570] libc: alpha: compat msgctl uses __IPC_64
2580 [24584] locale: Data race in __wcsmbs_clone_conv
2581 [24588] stdio: Remove codecvt vtables from libio
2582 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2584 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2585 [24632] stdio: Old binaries which use freopen with default stdio handles
2587 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2589 [24652] localedata: szl_PL spelling correction
2590 [24695] nss: nss_db: calling getpwent after endpwent crashes
2591 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2592 in /etc/nsswitch.conf
2593 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2594 [24740] libc: getdents64 type confusion
2595 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2596 always implemented in the same library
2597 [24744] libc: Remove copy_file_range emulation
2598 [24757] malloc: memusagestat is linked against system libpthread
2599 [24794] libc: Partial test suite run builds corrupt test-in-container
2607 * The getcpu wrapper function has been added, which returns the currently
2608 used CPU and NUMA node. This function is Linux-specific.
2610 * A new convenience target has been added for distribution maintainers
2611 to build and install all locales as directories with files. The new
2612 target is run by issuing the following command in your build tree:
2613 'make localedata/install-locale-files', with an optional DESTDIR
2614 to set the install root if you wish to install into a non-default
2615 configured location.
2617 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2619 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2620 for _GNU_SOURCE, to match BSD environments.
2622 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2623 indicates that it will abort the transaction prior to entering the kernel
2624 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2625 suspended, and this caused some undefined side-effects issues by aborting
2626 transactions manually. Glibc avoided it by abort transactions manually on
2627 each syscall, but it lead to performance issues on newer kernels where the
2628 HTM state is saved and restore lazily (the state being saved even when the
2629 process actually does not use HTM).
2631 * The functions posix_spawn_file_actions_addchdir_np and
2632 posix_spawn_file_actions_addfchdir_np have been added, enabling
2633 posix_spawn and posix_spawnp to run the new process in a different
2634 directory. These functions are GNU extensions. The function
2635 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2638 * The popen and system do not run atfork handlers anymore (BZ#17490).
2639 Although it is a possible POSIX violation, the POSIX rationale in
2640 pthread_atfork documentation regarding atfork handlers is to handle
2641 inconsistent mutex state after a fork call in a multi-threaded process.
2642 In both popen and system there is no direct access to user-defined mutexes.
2644 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2645 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2647 - C-SKY ABIV2 soft-float little-endian
2648 - C-SKY ABIV2 hard-float little-endian
2650 * strftime's default formatting of a locale's alternative year (%Ey)
2651 has been changed to zero-pad the year to a minimum of two digits,
2652 like "%y". This improves the display of Japanese era years during
2653 the first nine years of a new era, and is expected to be harmless
2654 for all other locales (only Japanese locales regularly have
2655 alternative year numbers less than 10). Zero-padding can be
2656 overridden with the '_' or '-' flags (which are GNU extensions).
2658 * As a GNU extension, the '_' and '-' flags can now be applied to
2659 "%EY" to control how the year number is formatted; they have the
2660 same effect that they would on "%Ey".
2662 Deprecated and removed features, and other changes affecting compatibility:
2664 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2665 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2667 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2668 in <sys/procfs.h>, has been corrected to match the type actually used by
2669 the Linux kernel. This affects the size and layout of that structure on
2670 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2672 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2673 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2674 defined in <sys/procfs.h>, has been corrected to match the type actually
2675 used by the Linux kernel. This affects the size and layout of those
2678 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2679 meant to scan a string and allocate space for it with malloc, is now
2680 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2681 defined. This extension conflicts with C99's use of '%a' to scan a
2682 hexadecimal floating-point number, which is now available to programs
2683 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2685 POSIX.1-2008 includes the feature of allocating a buffer for string input
2686 with malloc, using the modifier letter 'm' instead. Programs using
2687 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2688 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2689 C99 '%a' no longer need to avoid _GNU_SOURCE.
2691 GCC's -Wformat warnings can detect most uses of this extension, as long
2692 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2693 __attribute__ ((format (scanf, ...))).
2695 Changes to build and runtime requirements:
2697 * Python 3.4 or later is required to build the GNU C Library.
2699 * On most architectures, GCC 5 or later is required to build the GNU C
2700 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2702 Older GCC versions and non-GNU compilers are still supported when
2703 compiling programs that use the GNU C Library.
2705 Security related changes:
2707 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2708 denial of service due to resource exhaustion when processing getaddrinfo
2709 calls with crafted host names. Reported by Guido Vranken.
2711 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2712 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2713 happened, accessing the 32-bit size_t value as the full 64-bit register
2714 in the assembly string/memory functions would cause a buffer overflow.
2715 Reported by H.J. Lu.
2717 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2718 addresses with arbitrary trailing characters, potentially leading to data
2719 or command injection issues in applications.
2721 The following bugs are resolved with this release:
2723 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2724 [10496] localedata: 12h time representation in multiple locales faulty
2725 [10797] localedata: it_IT locale numeric does not have a separator for
2727 [11319] libc: dprintf doesn't handle errors properly
2728 [16346] time: mktime: potentially unsafe use of localtime_offset
2729 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2731 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2732 posix_spawn_file_actions_addfchdir_np
2733 [17426] localedata: Indian locales: set the correct date format
2734 [17490] stdio: popen should not invoke atfork handlers
2735 [17783] libc: TIOCSER_TEMT conditions inconsistent
2736 [18040] regex: use-after-free in regexec/get_subexp
2737 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2738 [20018] network: getaddrinfo should reject IP addresses with trailing
2739 characters (CVE-2016-10739)
2740 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2741 [20271] libc: Missing "\n" in __libc_fatal calls
2742 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2743 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2744 pointer argument is non-NULL
2745 [21037] stdio: open_memstream and freopen
2746 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2747 [21716] time: Crash in glibc's mktime in low-memory situations
2748 [22834] stdio: Subprocess forked by popen may crash in Linux when
2749 multithreads call popen
2750 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2751 and pthread_create fails.
2752 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2753 [23125] libc: riscv64: endless loop when throwing an exception from a
2755 [23275] nptl: Race in pthread_mutex_lock while promoting to
2756 PTHREAD_MUTEX_ELISION_NP.
2757 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2759 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2761 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2763 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2764 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2766 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2767 [23521] nss: get_next_alias nss_files file stream leak
2768 [23538] nptl: Hang in pthread_cond_broadcast
2769 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2770 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2771 [23579] libc: Errors misreported in preadv2
2772 [23597] build: support/test-container.c doesn't work with different
2774 [23603] time: mktime signed integer overflow on large timestamps
2775 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2776 [23614] libc: powerpc: missing CFI register information in __mpn_*
2778 [23637] string: Generic strstr/strcasestr fails with huge needles
2779 [23640] libc: no way to easily clear FD_CLOEXEC in
2780 posix_spawn_file_actions_adddup2()
2781 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2783 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2785 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2786 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2787 bits/types/struct_rusage.h
2788 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2790 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2792 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2793 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2794 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2796 [23724] localedata: Albanian date formats are incorrect
2797 [23735] math: libnldbl_nonshared.a references internal libm symbols
2798 [23740] localedata: kl_GL: Month names and date formats need update
2799 [23744] regex: regex refactorings to remove BE, avoid duplication
2800 [23745] time: mktime fix for Gnulib + coreutils
2801 [23758] time: Improve the width of alternate representation for year in
2803 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2804 [23789] time: mktime does not set errno on failure
2805 [23791] localedata: Wrong monetary format for ca_ES locale
2806 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2807 [23794] locale: c16rtomb does not handle surrogate pairs
2808 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2809 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2810 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2811 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2812 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2813 [23862] libc: [sh] missing kernel-features.h undefines
2814 [23864] libc: [riscv] missing kernel-features.h undefines
2815 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2816 [23907] malloc: Incorrect double-free malloc tcache check disregards
2818 [23913] libc: off-by-one in function maybe_script_execute in
2819 sysdeps/posix/spawni.c
2820 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2821 [23923] locale: Add --no-hard-links option to localedef
2822 [23927] network: Linux if_nametoindex() does not close descriptor
2824 [23961] math: powf can overflow to inf without setting errno in non-
2825 nearest rounding mode
2826 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2827 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2828 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2829 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2830 [24011] localedata: Fixed small type in comment for locale bs_BA
2831 [24018] libc: gettext() may return NULL
2832 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2833 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2834 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2836 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2837 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2839 [24046] localedata: en_US locale doesn't define date_fmt
2840 [24063] manual: @var{errno} should be @code{errno}
2841 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2842 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2844 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2846 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2848 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2850 [24112] network: Do not send DNS queries for non-host names (where all
2851 answers will be rejected)
2852 [24130] libc: alpha __remqu corrupts $f3 register
2859 * The localization data for ISO 14651 is updated to match the 2016
2860 Edition 4 release of the standard, this matches data provided by
2861 Unicode 9.0.0. This update introduces significant improvements to the
2862 collation of Unicode characters. This release deviates slightly from
2863 the standard in that the collation element ordering for lowercase and
2864 uppercase LATIN script characters is adjusted to ensure that regular
2865 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2866 is not matched by [a-z]. With the update many locales have been
2867 updated to take advantage of the new collation information. The new
2868 collation information has increased the size of the compiled locale
2869 archive or binary locales.
2871 * The GNU C Library can now be compiled with support for Intel CET, AKA
2872 Intel Control-flow Enforcement Technology. When the library is built
2873 with --enable-cet, the resulting glibc is protected with indirect
2874 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2875 compatible with all existing executables and shared libraries. This
2876 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2877 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2878 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2879 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2880 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2881 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2884 * The GNU C Library now has correct support for ABSOLUTE symbols
2885 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2886 relocated incorrectly or in some cases discarded. The GNU linker can
2887 make use of the newer semantics, but it must communicate it to the
2888 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2889 field) to indicate such support is required.
2891 * Unicode 11.0.0 Support: Character encoding, character type info, and
2892 transliteration tables are all updated to Unicode 11.0.0, using
2893 generator scripts contributed by Mike FABIAN (Red Hat).
2895 * <math.h> functions that round their results to a narrower type are added
2896 from TS 18661-1:2014 and TS 18661-3:2015:
2898 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2899 fMxaddfNx functions.
2901 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2902 fMxsubfNx functions.
2904 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2905 fMxmulfNx functions.
2907 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2908 fMxdivfNx functions.
2910 * Two grammatical forms of month names are now supported for the following
2911 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2912 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2913 support two grammatical forms in abbreviated month names: Catalan, Greek,
2916 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2917 include the support for two grammatical forms of month names.
2919 * Building and running on GNU/Hurd systems now works without out-of-tree
2922 * The renameat2 function has been added, a variant of the renameat function
2923 which has a flags argument. If the flags are zero, the renameat2 function
2924 acts like renameat. If the flag is not zero and there is no kernel
2925 support for renameat2, the function will fail with an errno value of
2926 EINVAL. This is different from the existing gnulib function renameatu,
2927 which performs a plain rename operation in case of a RENAME_NOREPLACE
2928 flags and a non-existing destination (and therefore has a race condition
2929 that can clobber the destination inadvertently).
2931 * The statx function has been added, a variant of the fstatat64
2932 function with an additional flags argument. If there is no direct
2933 kernel support for statx, glibc provides basic stat support based on
2934 the fstatat64 function.
2936 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2937 library if installed. libidn2 version 2.0.5 or later is recommended. If
2938 libidn2 is not available, internationalized domain names are not encoded
2939 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2940 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2941 with an encoding error.) Flags which used to change the IDN encoding and
2942 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2943 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2944 deprecated. They no longer have any effect.
2946 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2947 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2948 range of ELF gABI expressions including such constructs as
2949 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2950 have been further restricted, and where in the past a dynamic string
2951 token sequence may have been interpreted as a literal string it will
2952 now cause a load failure. These load failures were always considered
2953 unspecified behaviour from the perspective of the dynamic loader, and
2954 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2955 results in a load failure now.
2957 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2958 implementation includes all the standard functions provided by
2961 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2962 thrd_detach, thrd_exit, and thrd_join for thread management.
2964 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2965 mtx_destroy for mutual exclusion.
2967 - call_once for function call synchronization.
2969 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2970 cnd_wait for conditional variables.
2972 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2974 Application developers must link against libpthread to use ISO C threads.
2976 Deprecated and removed features, and other changes affecting compatibility:
2978 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2979 installed. Software that was using either header should be updated to
2980 use standard <stdio.h> interfaces instead.
2982 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2983 This was never required by the C standard, and the macros just expanded
2984 to call alternative names for the same functions. If you hoped getc and
2985 putc would provide performance improvements over fgetc and fputc, instead
2986 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2987 necessary, flockfile and funlockfile.
2989 * All stdio functions now treat end-of-file as a sticky condition. If you
2990 read from a file until EOF, and then the file is enlarged by another
2991 process, you must call clearerr or another function with the same effect
2992 (e.g. fseek, rewind) before you can read the additional data. This
2993 corrects a longstanding C99 conformance bug. It is most likely to affect
2994 programs that use stdio to read interactive input from a terminal.
2997 * The macros 'major', 'minor', and 'makedev' are now only available from
2998 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2999 headers that happen to include <sys/types.h>. These macros are rarely
3000 used, not part of POSIX nor XSI, and their names frequently collide with
3001 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
3002 further explanation.
3004 <sys/sysmacros.h> is a GNU extension. Portable programs that require
3005 these macros should first include <sys/types.h>, and then include
3006 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
3008 * The tilegx*-*-linux-gnu configurations are no longer supported.
3010 * The obsolete function ustat is no longer available to newly linked
3011 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
3012 function has been deprecated in favor of fstatfs and statfs.
3014 * The obsolete function nfsservctl is no longer available to newly linked
3015 binaries. This function was specific to systems using the Linux kernel
3016 and could not usefully be used with the GNU C Library on systems with
3017 version 3.1 or later of the Linux kernel.
3019 * The obsolete function name llseek is no longer available to newly linked
3020 binaries. This function was specific to systems using the Linux kernel
3021 and was not declared in a header. Programs should use the lseek64 name
3022 for this function instead.
3024 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
3025 getaddrinfo and getnameinfo functions have been deprecated. The behavior
3026 previously selected by them is now always enabled.
3028 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
3029 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
3030 restriction (rejecting '_' in host names, among other things) has been
3031 removed, for increased compatibility with non-IDN name resolution.
3033 * The fcntl function now have a Long File Support variant named fcntl64. It
3034 is added to fix some Linux Open File Description (OFD) locks usage on non
3035 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
3036 fcntl and LFS support is handled transparently. Also for Linux, the OFD
3037 locks act as a cancellation entrypoint.
3039 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
3040 ecb_crypt, and des_setparity are no longer available to newly linked
3041 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
3042 longer installed. These functions encrypted and decrypted data with the
3043 DES block cipher, which is no longer considered secure. Software that
3044 still uses these functions should switch to a modern cryptography library,
3047 * Reflecting the removal of the encrypt and setkey functions above, the
3048 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
3049 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
3052 * The obsolete function fcrypt is no longer available to newly linked
3053 binaries. It was just another name for the standard function crypt,
3054 and it has not appeared in any header file in many years.
3056 * We have tentative plans to hand off maintenance of the passphrase-hashing
3057 library, libcrypt, to a separate development project that will, we hope,
3058 keep up better with new passphrase-hashing algorithms. We will continue
3059 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
3060 'crypt_r' should not need to change at all; however, distributions will
3061 need to install <crypt.h> and libcrypt from a separate project.
3063 In this release, if the configure option --disable-crypt is used, glibc
3064 will not install <crypt.h> or libcrypt, making room for the separate
3065 project's versions of these files. The plan is to make this the default
3066 behavior in a future release.
3068 Changes to build and runtime requirements:
3070 GNU make 4.0 or later is now required to build glibc.
3072 Security related changes:
3074 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
3075 been fixed by removing the glibc-internal IDNA implementation and using
3076 the system-provided libidn2 library instead. Originally reported by Hanno
3077 Böck and Christian Weisgerber.
3079 CVE-2017-18269: An SSE2-based memmove implementation for the i386
3080 architecture could corrupt memory. Reported by Max Horn.
3082 CVE-2018-11236: Very long pathname arguments to realpath function could
3083 result in an integer overflow and buffer overflow. Reported by Alexey
3086 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
3087 architecture could write beyond the target buffer, resulting in a buffer
3088 overflow. Reported by Andreas Schwab.
3090 The following bugs are resolved with this release:
3092 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
3093 [6889] manual: 'PWD' mentioned but not specified
3094 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
3095 when __WORDSIZE != 64
3096 [13762] regex: re_search etc. should return -2 on memory exhaustion
3097 [13888] build: /tmp usage during testing
3098 [13932] math: dbl-64 pow unexpectedly slow for some inputs
3099 [14092] nptl: Support C11 threads
3100 [14095] localedata: Review / update collation data from Unicode / ISO
3102 [14508] libc: -Wformat warnings
3103 [14553] libc: Namespace pollution loff_t in sys/types.h
3104 [14890] libc: Make NT_PRFPREG canonical.
3105 [15105] libc: Extra PLT references with -Os
3106 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
3108 [16335] manual: Feature test macro documentation incomplete and out of
3110 [16552] libc: Unify umount implementations in terms of umount2
3111 [17082] libc: htons et al.: statement-expressions prevent use on global
3112 scope with -O1 and higher
3113 [17343] libc: Signed integer overflow in /stdlib/random_r.c
3114 [17438] localedata: pt_BR: wrong d_fmt delimiter
3115 [17662] libc: please implement binding for the new renameat2 syscall
3116 [17721] libc: __restrict defined as /* Ignore */ even in c11
3117 [17979] libc: inconsistency between uchar.h and stdint.h
3118 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
3119 [18023] libc: extend_alloca is broken (questionable pointer comparison,
3120 horrible machine code)
3121 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
3123 [18471] libc: llseek should be a compat symbol
3124 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
3126 [18991] nss: nss_files skips large entry in database
3127 [19239] libc: Including stdlib.h ends up with macros major and minor being
3129 [19463] libc: linknamespace failures when compiled with -Os
3130 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
3131 [19527] locale: Normalized charset name not recognized by setlocale
3132 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
3133 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
3135 [19728] network: out of bounds stack read in libidn function
3136 idna_to_ascii_4i (CVE-2016-6261)
3137 [19729] network: out of bounds heap read on invalid utf-8 inputs in
3138 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
3139 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
3141 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
3142 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
3143 [20419] dynamic-link: files with large allocated notes crash in
3145 [20530] libc: bswap_16 should use __builtin_bswap16() when available
3146 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
3147 [20980] manual: CFLAGS environment variable replaces vital options
3148 [21163] regex: Assertion failure in pop_fail_stack when executing a
3149 malformed regexp (CVE-2015-8985)
3150 [21234] manual: use of CFLAGS makes glibc detect no optimization
3151 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
3152 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
3153 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
3154 [21508] locale: intl/tst-gettext failure with latest msgfmt
3155 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
3156 [21812] network: getifaddrs() returns entries with ifa_name == NULL
3157 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
3159 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
3161 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
3162 [22247] network: Integer overflow in the decode_digit function in
3163 puny_decode.c in libidn (CVE-2017-14062)
3164 [22342] nscd: NSCD not properly caching netgroup
3165 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
3166 [22550] localedata: es_ES locale (and other es_* locales): collation
3167 should treat ñ as a primary different character, sync the collation
3168 for Spanish with CLDR
3169 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
3170 by gcc configured with --enable-default-pie
3171 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
3172 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
3173 crossing 2GB threshold (CVE-2017-18269)
3174 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
3176 [22735] time: Misleading typo in time.h source comment regarding
3178 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
3179 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
3180 `__assert_perror_fail ()' to `__assert_fail_base ()'
3181 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
3183 [22786] libc: Stack buffer overflow in realpath() if input size is close
3184 to SSIZE_MAX (CVE-2018-11236)
3185 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
3186 through an absolute DT_NEEDED path
3187 [22792] build: tcb-offsets.h dependency dropped
3188 [22797] libc: pkey_get() uses non-reserved name of argument
3189 [22807] libc: PTRACE_* constants missing for powerpc
3190 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
3191 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
3192 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
3193 [22848] localedata: ca_ES: update date definitions from CLDR
3194 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
3195 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
3196 [22896] localedata: Update locale data for an_ES
3197 [22902] math: float128 test failures with GCC 8
3198 [22918] libc: multiple common of `__nss_shadow_database'
3199 [22919] libc: sparc32: backtrace yields infinite backtrace with
3201 [22926] libc: FTBFS on powerpcspe
3202 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
3204 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
3205 [22947] libc: FAIL: misc/tst-preadvwritev2
3206 [22963] localedata: cs_CZ: Add alternative month names
3207 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
3208 [22996] localedata: change LC_PAPER to en_US in es_BO locale
3209 [22998] dynamic-link: execstack tests are disabled when SELinux is
3211 [23005] network: Crash in __res_context_send after memory allocation
3213 [23007] math: strtod cannot handle -nan
3214 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
3215 [23036] regex: regex equivalence class regression
3216 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
3217 [23069] libc: sigaction broken on riscv64-linux-gnu
3218 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
3219 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
3220 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
3221 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
3222 and libc build with -Os)
3223 [23140] localedata: More languages need two forms of month names
3224 [23145] libc: _init/_fini aren't marked as hidden
3225 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
3226 [23171] math: C++ iseqsig for long double converts arguments to double
3227 [23178] nscd: sudo will fail when it is run in concurrent with commands
3228 that changes /etc/passwd
3229 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
3231 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
3232 [23208] localedata: New locale - Lower Sorbian (dsb)
3233 [23233] regex: Memory leak in build_charclass_op function in file
3235 [23236] stdio: Harden function pointers in _IO_str_fields
3236 [23250] nptl: Offset of __private_ss differs from GCC
3237 [23253] math: tgamma test suite failures on i686 with -march=x86-64
3238 -mtune=generic -mfpmath=sse
3239 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
3241 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
3242 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
3244 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
3245 [23277] math: nan function should not have const attribute
3246 [23279] math: scanf and strtod wrong for some hex floating-point
3247 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
3249 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
3250 [23303] build: undefined reference to symbol
3251 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
3252 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
3254 [23313] stdio: libio vtables validation and standard file object
3256 [23329] libc: The __libc_freeres infrastructure is not properly run across
3258 [23349] libc: Various glibc headers no longer compatible with
3260 [23351] malloc: Remove unused code related to heap dumps and malloc
3262 [23363] stdio: stdio-common/tst-printf.c has non-free license
3263 [23396] regex: Regex equivalence regression in single-byte locales
3264 [23422] localedata: oc_FR: More updates of locale data
3265 [23442] build: New warning with GCC 8
3266 [23448] libc: Out of bounds access in IBM-1390 converter
3267 [23456] libc: Wrong index_cpu_LZCNT
3268 [23458] build: tst-get-cpu-features-static isn't added to tests
3269 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
3271 [23467] dynamic-link: x86/CET: A property note parser bug
3278 * The GNU C Library can now be compiled with support for building static
3279 PIE executables (See --enable-static-pie in INSTALL). These static PIE
3280 executables are like static executables but can be loaded at any address
3281 and provide additional security hardening benefits at the cost of some
3282 memory and performance. When the library is built with --enable-static-pie
3283 the resulting libc.a is usable with GCC 8 and above to create static PIE
3284 executables using the GCC option '-static-pie'. This feature is currently
3285 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
3286 aarch64 with binutils 2.30 or later.
3288 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
3289 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
3292 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
3294 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
3296 * In order to support faster and safer process termination the malloc API
3297 family of functions will no longer print a failure address and stack
3298 backtrace after detecting heap corruption. The goal is to minimize the
3299 amount of work done after corruption is detected and to avoid potential
3300 security issues in continued process execution. Reducing shutdown time
3301 leads to lower overall process restart latency, so there is benefit both
3302 from a security and performance perspective.
3304 * The abort function terminates the process immediately, without flushing
3305 stdio streams. Previous glibc versions used to flush streams, resulting
3306 in deadlocks and further data corruption. This change also affects
3307 process aborts as the result of assertion failures.
3309 * On platforms where long double has the IEEE binary128 format (aarch64,
3310 alpha, mips64, riscv, s390 and sparc), the math library now implements
3311 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
3312 These are the same interfaces added in version 2.26 for some platforms where
3313 this format is supported but is not the format of long double.
3315 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
3316 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
3317 implements interfaces for that type, as defined by ISO/IEC TS
3318 18661-3:2015. These are corresponding interfaces to those supported for
3321 * The math library now implements interfaces for the _Float32, _Float64 and
3322 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
3323 corresponding interfaces to those supported for _Float128.
3325 * glibc now implements the memfd_create and mlock2 functions on Linux.
3327 * Support for memory protection keys was added. The <sys/mman.h> header now
3328 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
3331 * The copy_file_range function was added.
3333 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
3335 * The ldconfig utility now processes `include' directives using the C/POSIX
3336 collation ordering. Previous glibc versions used locale-specific
3337 ordering, the change might break systems that relied on that.
3339 * Support for two grammatical forms of month names has been added.
3340 In a call to strftime, the "%B" and "%b" format specifiers will now
3341 produce the grammatical form required when the month is used as part
3342 of a complete date. New "%OB" and "%Ob" specifiers produce the form
3343 required when the month is named by itself. For instance, in Greek
3344 and in many Slavic and Baltic languages, "%B" will produce the month
3345 in genitive case, and "%OB" will produce the month in nominative case.
3347 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
3348 are all valid and will all accept any known form of month
3349 name---standalone or complete, abbreviated or full. In a call to
3350 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
3351 the strings used by "%B" and "%b", respectively. New query
3352 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
3353 used by "%OB" and "%Ob", respectively.
3355 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
3356 define the strings for %OB and %Ob, respectively; these have the
3357 same syntax as "mon" and "abmon". These arrays are optional; if they
3358 are not provided then they have the same content as "mon" and "abmon",
3361 These features are provided for locales which define "alt_mon" and/or
3362 "ab_alt_mon" in their locale source data. This release includes such
3363 alternative month name data for the following languages: Belarusian,
3364 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
3366 This feature is currently a GNU extension, but it is expected to
3367 be added to the next revision of POSIX, and it is also already
3368 available on some BSD-derived operating systems.
3370 This feature will cause existing statically compiled applications
3371 to fail to load locales and fall back to the builtin C/POSIX locales.
3372 See notes below for other changes affecting compatibility.
3374 * Support for the RISC-V ISA running on Linux has been added. This port
3375 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
3376 for the following ISA and ABI pairs:
3382 Deprecated and removed features, and other changes affecting compatibility:
3384 * Statically compiled applications attempting to load locales compiled for the
3385 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
3386 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
3387 support for two grammatical forms of the month names, also extends the locale
3388 data binary format. Static applications needing locale support must be
3389 recompiled to match the runtime and data they are deployed with. In some
3390 distributions there is an upgrade window where dynamically linked applications
3391 may use a new library but the old locale data and also fall back to the
3392 builtin C/POSIX locales; restarting the application process is sufficient to
3395 * Support for statically linked applications which call dlopen is deprecated
3396 and will be removed in a future version of glibc. Applications which call
3397 dlopen need to be linked dynamically instead.
3399 * Support for old programs which use internal stdio data structures and
3400 functions is deprecated. This includes programs which use the C++ streams
3401 provided by libstdc++ in GCC 2.95. Programs which use the internal
3402 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
3403 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
3404 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
3405 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
3406 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
3407 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
3408 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
3409 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
3410 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
3411 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
3412 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
3413 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
3414 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
3415 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
3416 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
3417 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
3418 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
3419 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
3420 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
3421 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
3422 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
3423 future version of glibc. Unlike other symbol removals, these old
3424 applications will not be supported using compatibility symbols.
3426 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
3427 defined by <sys/ptrace.h>.
3429 * libm no longer supports SVID error handling (calling a user-provided
3430 matherr function on error) or the _LIB_VERSION variable to control error
3431 handling. (SVID error handling and the _LIB_VERSION variable still work
3432 for binaries linked against older versions of the GNU C Library.) The
3433 libieee.a library is no longer provided. math.h no longer defines struct
3434 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
3435 TLOSS, PLOSS and HUGE.
3437 * The libm functions pow10, pow10f and pow10l are no longer supported for
3438 new programs. Programs should use the standard names exp10, exp10f and
3439 exp10l for these functions instead.
3441 * The mcontext_t type is no longer the same as struct sigcontext. On
3442 platforms where it was previously the same, this changes the C++ name
3443 mangling for interfaces involving this type.
3445 * The add-ons mechanism for building additional packages at the same time as
3446 glibc has been removed. The --enable-add-ons configure option is now
3449 * The --without-fp configure option is now ignored. Whether hardware
3450 floating-point instructions are used is now configured based on whether
3451 the compiler used at configure time (without any options implied by a
3452 --with-cpu= configure option) uses such instructions.
3454 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
3455 the specified string can be parsed as a domain name.
3457 * In the malloc_info output, the <heap> element may contain another <aspace>
3458 element, "subheaps", which contains the number of sub-heaps.
3460 * The libresolv function p_secstodate is no longer supported for new
3463 * The tilepro-*-linux-gnu configuration is no longer supported.
3465 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3466 and will be removed in a future release. Software that is still using
3467 either header should be updated to use standard <stdio.h> interfaces
3470 libio.h was originally the header for a set of supported GNU extensions,
3471 but they have not been maintained as such in many years, they are now
3472 standing in the way of improvements to stdio, and we don't think there are
3473 any remaining external users. _G_config.h was never intended for public
3474 use, but predates the bits convention.
3476 Changes to build and runtime requirements:
3478 * bison version 2.7 or later is required to generate code in the 'intl'
3481 Security related changes:
3483 CVE-2009-5064: The ldd script would sometimes run the program under
3484 examination directly, without preventing code execution through the
3485 dynamic linker. (The glibc project disputes that this is a security
3486 vulnerability; only trusted binaries must be examined using the ldd
3489 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3490 suffered from a one-byte overflow during ~ operator processing (either
3491 on the stack or the heap, depending on the length of the user name).
3492 Reported by Tim Rühsen.
3494 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3495 would sometimes fail to free memory allocated during ~ operator
3496 processing, leading to a memory leak and, potentially, to a denial
3499 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3500 without GLOB_NOESCAPE, could write past the end of a buffer while
3501 unescaping user names. Reported by Tim Rühsen.
3503 CVE-2017-17426: The malloc function, when called with an object size near
3504 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3505 instead of NULL. This was a regression introduced with the new malloc
3506 thread cache in glibc 2.26. Reported by Iain Buclaw.
3508 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3509 to the allocation of too much memory. (This is not a security bug per se,
3510 it is mentioned here only because of the CVE assignment.) Reported by
3513 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3514 of the number of search path components. (This is not a security
3515 vulnerability per se because no trust boundary is crossed if the fix for
3516 CVE-2017-1000366 has been applied, but it is mentioned here only because
3517 of the CVE assignment.) Reported by Qualys.
3519 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3520 for AT_SECURE or SUID binaries could be used to load libraries from the
3523 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3524 succeeds without returning an absolute path due to unexpected behaviour
3525 of the Linux kernel getcwd syscall. Reported by halfdog.
3527 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3528 an object size near the value of SIZE_MAX, would return a pointer to a
3529 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3531 CVE-2018-6551: The malloc function, when called with an object size near
3532 the value of SIZE_MAX, would return a pointer to a buffer which is too
3533 small, instead of NULL.
3535 The following bugs are resolved with this release:
3537 [866] glob: glob should match dangling symlinks
3538 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3539 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3541 [5997] math: Very slow execution of sinf function
3542 [10580] localedata: hr_HR: updated locale
3543 [10871] locale: 'mon' array should contain both nominative and genitive
3545 [12349] localedata: eu_ES: incorrect thousands separator
3546 [13605] localedata: shn_MM: new Shan locale
3547 [13805] localedata: ru_RU: currency should use ',' as radix point
3548 [13953] localedata: km_KH: locale update
3549 [13994] localedata: mjw_IN: new locale
3550 [14121] build: make writes .mo files in po directory
3551 [14333] libc: Fix the race between atexit() and exit()
3552 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3553 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3555 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3556 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3557 width Latin characters
3558 [15332] localedata: es_CU: locale update
3559 [15436] stdio: Don't close or flush stdio streams on abort
3560 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3562 [16148] localedata: ca_ES: incorrect thousands separator
3563 [16750] dynamic-link: ldd should not try to execute the binaries
3565 [16777] localedata: pl_PL: incorrect thousands separator in locale
3566 [16905] localedata: hanzi: new collation
3567 [17563] localedata: cmn_TW: add hanzi collation
3568 [17750] localedata: wrong collation order of diacritics in most locales
3569 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3571 [17956] build: Build fails on missing definitions from header file
3572 nss/nss.h when Mozilla NSS is used for cryptography
3573 [18203] libc: realpath() does not handle unreachable paths correctly
3574 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3575 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3576 [18822] libc: Internal functions are called via PLT
3577 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3578 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3579 [19574] libc: glibc should support building static PIE binaries
3580 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3582 [19971] glob: glob: Do not skip entries with zero d_ino values
3583 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3584 [20008] localedata: km_KH: convert to translit_neutral
3585 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3586 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3587 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3588 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3589 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3591 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3592 they're set, wrong errors returned by gaih_inet when lookup functions
3594 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3595 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3597 [20952] localedata: yuw_PG: new locale
3598 [21084] localedata: charmaps/IBM858: new codepage
3599 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3600 [21242] libc: assert gives pedantic warning in old gcc versions
3601 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3602 __regcall calling convention
3603 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3604 [21326] libc: C99 functions are not declared for C++11 and later if
3605 _GNU_SOURCE is not predefined by g++
3606 [21457] libc: sys/ucontext.h namespace
3607 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3608 [21660] math: GCC fails to compile a formula with tgmath.h
3609 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3610 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3611 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3612 [21684] math: tgmath.h handling of complex integers
3613 [21685] math: tgmath.h handling of bit-fields
3614 [21686] math: tgmath.h handling of __int128
3615 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3617 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3619 [21750] localedata: column width of characters incompatible with classical
3621 [21754] malloc: malloc: Perform as little work as possible after heap
3622 consistency check failures
3623 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3624 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3625 [21791] string: Unused XXX_chk_XXX functions in libc.a
3626 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3628 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3630 [21845] localedata: Added new Locale bho_NP
3631 [21853] localedata: Fix abday Which looks same as day in zh_SG
3632 [21854] localedata: Added New Locale en_SC
3633 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3634 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3635 _dl_runtime_resolve_avx_slow
3636 [21885] network: getaddrinfo: gethosts does not release resolver context
3637 on memory allocation failure
3638 [21899] libc: XPG4.2 sigaction namespace
3639 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3641 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3643 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3644 errno value, causing getaddrinfo to fail
3645 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3646 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3647 instead of EAI_NODATA
3648 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3649 constant PTRACE_SEIZE_DEVEL
3650 [21930] math: C-only gcc builtins used in <math.h> isinf
3651 [21932] network: Unpaired __resolv_context_get in generic get*_r
3653 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3654 [21944] libc: sigval namespace
3655 [21951] localedata: Update hanzi collation by stroke
3656 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3657 sysdeps/x86_64/fpu/e_expf.S
3658 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3659 allocation in syscall loops)
3660 [21959] localedata: Fix Country name for xh_ZA
3661 [21960] localedata: Fix abmon for bem_ZM
3662 [21966] math: AVX2 mathvec functions use FMA without checking
3663 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3664 [21971] localedata: Added New Locale for mfe_MU
3665 [21972] libc: assert macro requires operator== (int) for its argument type
3666 [21973] math: [sparc] libm missing sqrtl compat symbol
3667 [21974] libc: Remove __bb_init_func and __bb_exit_func
3668 [21982] string: stratcliff.c: error: assuming signed overflow does not
3670 [21986] stdio: __guess_grouping is called incorrectly
3671 [21987] math: [sparc32] wrong bits/long-double.h installed
3672 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3674 [22022] localedata: Missing country_name for mni_IN
3675 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3677 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3679 [22026] locale: iconv_open: heap overflow on gconv_init failure
3680 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3681 [22035] math: [m68k] bits/math-inline.h macro namespace
3682 [22038] localedata: Fix abbreviated weeks and months for Somali
3683 [22044] localedata: Remove redundant data for Limburgish Language
3684 [22050] malloc: Linking with -lmcheck does not hook
3685 __malloc_initialize_hook correctly
3686 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3687 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3688 [22070] localedata: charmaps/UTF-8: wcwidth for
3689 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3690 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3691 Jungseong and Jongseong) should be 0
3692 [22078] nss: nss_files performance issue in multi mode
3693 [22082] math: bits/math-finite.h exp10 condition
3694 [22086] libc: pcprofiledump incorrect cross-endian condition
3695 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3696 [22095] network: Name server address allocation memory leak in resolv.conf
3698 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3700 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3701 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3703 [22111] malloc: malloc: per thread cache is not returned when thread exits
3704 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3705 [22134] libc: [linux] implement fexecve with execveat
3706 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3708 [22145] libc: ttyname() gives up too early in the face of namespaces
3709 [22146] math: C++ build issue with float128 on x86_64
3710 [22153] nptl: nptl: save error code before process termination
3711 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3712 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3713 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3714 [22165] libc: [hppa] Text relocations in libc.so
3715 [22180] libc: destructor registered via __cxa_atexit is called twice
3716 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3717 symlinks") cause "make" segfaults
3718 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3720 [22207] libc: FAIL: stdlib/test-atexit-race
3721 [22225] math: nearbyint arithmetic moved before feholdexcept
3722 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3723 [22235] math: iscanonical in C++ and float128
3724 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3725 the svid compat wrapper
3726 [22244] math: ynf and yn are wrong without the svid compat wrapper
3727 [22273] libc: Improper assert in Linux posix_spawn implementation
3728 [22284] libc: -pg -pie doesn't work
3729 [22292] locale: localedef exits with error 4 when it should be error 1
3730 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3731 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3733 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3734 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3736 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3737 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3738 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3739 [22322] libc: [mips64] wrong bits/long-double.h installed
3740 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3741 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3743 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3744 [22343] malloc: Integer overflow in posix_memalign
3745 [22347] libc: getrandom() returns the number of bytes that were copied to
3746 the buffer even though the comments say "Return 0 on success and -1 on
3748 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3749 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3751 [22370] dynamic-link: Incorrect note padding check
3752 [22375] libc: malloc returns pointer from tcache_get when should return
3753 NULL (CVE-2017-17426)
3754 [22377] math: iseqsig, float128 and C++
3755 [22382] localedata: Error in tpi_PG locale
3756 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3757 inside the ASCII printable range
3758 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3760 [22403] localedata: Slash needs escaping in some locales
3761 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3762 [22409] network: res_hnok does not accept some host names used on the
3764 [22412] network: res_dnok, res_hnok should perform syntax checks
3765 [22413] network: ns_name_pton ignores syntactically invalid trailing
3767 [22415] stdio: setvbuf can lead to invalid free/segfault
3768 [22432] build: Non-deterministic build
3769 [22439] malloc: malloc_info should compute summary statistics for all sub-
3771 [22442] network: if_nametoindex could report index for the wrong
3772 networking interface
3773 [22446] build: aliasing violation calling readlink in handle_request
3774 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3775 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3776 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3777 __nscd_hash/__nss_hash
3778 [22463] network: p_secstodate overflow handling
3779 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3780 [22478] libc: sigwait can fail with EINTR
3781 [22505] libc: ldconfig processes include directive in locale-specific
3783 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3784 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3785 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3786 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3787 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3788 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3789 same as for Croatian
3790 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3791 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3792 [22577] libc: missing newline after "cannot allocate TLS data structures
3794 [22588] manual: manual/conf.texi: missing underscore in front of
3796 [22593] math: nextafter and nexttoward are declared with const attribute
3797 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3798 [22603] string: ia64 memchr overflows internal pointer check
3799 [22605] libc: SH clone does not set the exit code correctly
3800 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3802 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3803 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3804 modified in case of success
3805 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3806 [22615] manual: manual: ambiguous wording about errno value in case of
3808 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3810 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3811 binaries or if /proc is not mounted (CVE-2017-16997)
3812 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3813 [22630] build: $(no-pie-ldflag) is no longer effective
3814 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3815 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3816 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3817 [22637] nptl: guard size is subtracted from thread stack size instead of
3819 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3820 [22657] localedata: hu_HU: Avoid double space in date
3821 [22660] math: fmax, fmin sNaN handling on alpha
3822 [22664] libc: New warning of GCC8
3823 [22665] math: alpha: ceil and floor raise inexact exceptions
3824 [22666] math: alpha: trunc raise inexact exceptions
3825 [22667] libc: makecontext lacks stack alignment on i386
3826 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3827 [22679] libc: getcwd(3) can succeed without returning an absolute path
3829 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3830 elision and tunables
3831 [22687] math: [powerpc-nofpu] complex long double functions spurious
3833 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3834 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3835 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3837 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3838 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3840 [22701] nis: Incomplete removal of libnsl
3841 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3842 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3843 [22715] dynamic-link: FAIL: elf/tst-audit10
3844 [22719] libc: Backtrace tests fail on hppa
3845 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3846 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3847 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3848 before the first call to crypt_r () in crypt/badsalttest.c
3855 * A per-thread cache has been added to malloc. Access to the cache requires
3856 no locks and therefore significantly accelerates the fast path to allocate
3857 and free small amounts of memory. Refilling an empty cache requires locking
3858 the underlying arena. Performance measurements show significant gains in a
3859 wide variety of user workloads. Workloads were captured using a special
3860 instrumented malloc and analyzed with a malloc simulator. Contributed by
3861 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3863 * Unicode 10.0.0 Support: Character encoding, character type info, and
3864 transliteration tables are all updated to Unicode 10.0.0, using
3865 generator scripts contributed by Mike FABIAN (Red Hat).
3866 These updates cause user visible changes, especially the changes in
3867 wcwidth for many emoji characters cause problems when emoji sequences
3868 are rendered with pango, see for example:
3869 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3871 * Collation of Hungarian has been overhauled and is now consistent with "The
3872 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3875 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3877 - The GNU C Library will now detect when /etc/resolv.conf has been
3878 modified and reload the changed configuration. The new resolver option
3879 “no-reload” (RES_NORELOAD) disables this behavior.
3881 - The GNU C Library now supports an arbitrary number of search domains
3882 (configured using the “search” directive in /etc/resolv.conf);
3883 previously, there was a hard limit of six domains. For backward
3884 compatibility, applications that directly modify the ‘_res’ global
3885 object are still limited to six search domains.
3887 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3888 Library will now randomly pick a name server from the configuration as a
3889 starting point. (Previously, the second name server was always used.)
3891 * The tunables feature is now enabled by default. This allows users to tweak
3892 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3894 * New function reallocarray, which resizes an allocated block (like realloc)
3895 to the product of two sizes, with a guaranteed clean failure upon integer
3896 overflow in the multiplication. Originally from OpenBSD, contributed by
3897 Dennis Wölfing and Rüdiger Sonderfeld.
3899 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3900 These are extended versions of preadv and pwritev, respectively, taking an
3901 additional flags argument. The set of supported flags depends on the
3902 running kernel; full support currently requires kernel 4.7 or later.
3904 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3905 create a new session ID for the spawned process. This feature is
3906 scheduled to be added to the next major revision of POSIX; for the time
3907 being, it is available under _GNU_SOURCE.
3909 * errno.h is now safe to use from C-preprocessed assembly language on all
3910 supported operating systems. In this context, it will only define the
3911 Exxxx constants, as preprocessor macros expanding to integer literals.
3913 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3914 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3915 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3916 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3918 To compile programs that use this feature, the compiler must support
3919 128-bit floating point with the type name _Float128 (as defined by TS
3920 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3921 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3922 must be defined to make the new interfaces visible.
3924 The new functions and macros correspond to those present for other
3925 floating-point types (except for a few obsolescent interfaces not
3926 supported for the new type), with F128 or f128 suffixes; for example,
3927 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3928 printf or scanf formats for the new type; the strfromf128 and strtof128
3929 interfaces should be used instead.
3931 Deprecated and removed features, and other changes affecting compatibility:
3933 * The synchronization that pthread_spin_unlock performs has been changed to
3934 now be equivalent to a C11 atomic store with release memory order to the
3935 spin lock's memory location. Previously, several (but not all)
3936 architectures used stronger synchronization (e.g., containing what is
3937 often called a full barrier). This change can improve performance, but
3938 may affect odd fringe uses of spin locks that depend on the previous
3939 behavior (e.g., using spin locks as atomic variables to try to implement
3940 Dekker's mutual exclusion algorithm).
3942 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3945 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3946 will only be built and installed when the GNU C Library is configured with
3947 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3948 as TIRPC or rpcsvc-proto, to be used.
3950 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3951 libnss_compat, are deprecated, and will not be built or installed by
3954 The NIS(+) support library, libnsl, is also deprecated. By default, a
3955 compatibility shared library will be built and installed, but not headers
3956 or development libraries. Only a few NIS-related programs require this
3957 library. (In particular, the GNU C Library has never required programs
3958 that use 'gethostbyname' to be linked with libnsl.)
3960 Replacement implementations based on TIRPC, which additionally support
3961 IPv6, are available from <https://github.com/thkukuk/>. The configure
3962 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3963 name service modules, to be built and installed.
3965 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3966 support is enabled, the configured recursive resolver must support EDNS.
3967 (Responding to EDNS-enabled queries with responses which are not
3968 EDNS-enabled is fine, but FORMERR responses are not.)
3970 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3971 servers have not supported this opcode for a long time.
3973 * The _res_opcodes variable has been removed from libresolv. It had been
3974 exported by accident.
3976 * <string.h> no longer includes inline versions of any string functions,
3977 as this kind of optimization is better done by the compiler. The macros
3978 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3980 * The nonstandard header <xlocale.h> has been removed. Most programs should
3981 use <locale.h> instead. If you have a specific need for the definition of
3982 locale_t with no other declarations, please contact
3983 libc-alpha@sourceware.org and explain.
3985 * The obsolete header <sys/ultrasound.h> has been removed.
3987 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3989 * The obsolete function cfree has been removed. Applications should use
3992 * The stack_t type no longer has the name struct sigaltstack. This changes
3993 the C++ name mangling for interfaces involving this type.
3995 * The ucontext_t type no longer has the name struct ucontext. This changes
3996 the C++ name mangling for interfaces involving this type.
3998 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3999 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
4000 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
4001 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
4002 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
4003 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
4004 fpregset_t type no longer has the name struct fpu. This changes the C++
4005 name mangling for interfaces involving those types.
4007 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
4008 synced with the kernel:
4010 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
4011 are not supported on this architecture and have been removed.
4013 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
4014 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
4015 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
4017 Programs that assume the GET/SETREGS ptrace requests are universally
4018 available will now fail to build, instead of malfunctioning at runtime.
4020 Changes to build and runtime requirements:
4022 * Linux kernel 3.2 or later is required at runtime, on all architectures
4023 supported by that kernel. (This is a change from version 2.25 only for
4026 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
4028 * On most architectures, GCC 4.9 or later is required to build the GNU C
4029 Library. On powerpc64le, GCC 6.2 or later is required.
4031 Older GCC versions and non-GNU compilers are still supported when
4032 compiling programs that use the GNU C Library. (We do not know exactly
4033 how old, and some GNU extensions to C may be _de facto_ required. If you
4034 are interested in helping us make this statement less vague, please
4035 contact libc-alpha@sourceware.org.)
4037 Security related changes:
4039 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
4040 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
4042 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
4043 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
4045 * Avoid printing a backtrace from the __stack_chk_fail function since it is
4046 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
4049 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
4050 fixed (CVE-2017-12133).
4052 The following bugs are resolved with this release:
4054 [984] network: Respond to changed resolv.conf in gethostbyname
4055 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
4056 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
4058 [12189] libc: __stack_chk_fail should not attempt a backtrace
4060 [14096] time: Race condition on timezone/tst-timezone.out
4061 [14172] localedata: az_IR: new locale
4062 [14995] build: glibc fails to build if gold is the default linker, even if
4064 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
4065 [16637] network: inet_pton function is accepting IPv6 with bad format
4066 [16640] string: string/strtok.c: undefined behaviour inconsistent between
4067 x86 and other generic code
4068 [16875] localedata: ko_KR: fix lang_name
4069 [17225] localedata: ar_SY: localized month names for May and June are
4071 [17297] localedata: da_DK: wrong date_fmt string
4072 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
4073 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
4074 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
4075 [19066] localedata: ar_SA abbreviated day and month names are in English
4076 [19569] network: resolv: Support an arbitrary number of search domains
4077 [19570] network: Implement random DNS server selection in the stub
4079 [19838] locale: localedef fails on PA-RISC
4080 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
4081 order of 0D36 and 0D37
4082 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
4084 [20098] libc: FAIL: debug/backtrace-tst on hppa
4085 [20257] network: sunrpc: clntudp_call does not enforce timeout when
4087 [20275] localedata: locale day/abday/mon/abmon should not have trailing
4089 [20313] localedata: Update locale data to Unicode 9.0
4090 [20424] manual: Document how to provide a malloc replacement
4091 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
4093 [20686] locale: Add el_GR@euro to SUPPORTED.
4094 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
4095 failures consistently
4096 [21015] dynamic-link: Document and fix --enable-bind-now
4097 [21016] nptl: pthread_cond support is broken on hppa
4098 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
4099 frame-pointer on i386
4100 [21049] libc: segfault in longjmp_chk() due to clobbered processor
4102 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
4103 [21088] libc: Build fails with --enable-static-nss
4104 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
4105 generic c code is used
4106 [21109] libc: Tunables broken on big-endian
4107 [21112] math: powf has large ulp errors with base close to 1 and exponent
4109 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
4111 [21120] malloc: glibc malloc is incompatible with GCC 7
4112 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
4114 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
4115 (-0.0) when linking with -lieee
4116 [21171] math: log10, log2 and lgamma return incorrect results
4117 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
4118 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
4119 [21207] localedata: ce_RU: update weekdays from CLDR
4120 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
4121 [21217] localedata: Update months from CLDR-31
4122 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
4123 [21243] libc: support_delete_temp_file should issue warning for failed
4125 [21244] libc: support resolv_test_start() socket fd close should be
4127 [21253] libc: localedef randomly segfaults when using -fstack-check due to
4128 new posix_spawn implementation
4129 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
4130 leads to lower CPU frequency
4131 [21259] libc: [alpha] termios.h missing IXANY for POSIX
4132 [21261] libc: [sparc64] bits/setjmp.h namespace
4133 [21267] network: [mips] bits/socket.h IOC* namespace
4134 [21268] libc: [alpha] termios.h NL2, NL3 namespace
4135 [21270] libc: mmap64 silently truncates large offset values
4136 [21275] libc: posix_spawn always crashes on ia64 now
4137 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
4138 [21280] math: [powerpc] logbl for POWER7 return incorrect results
4139 [21289] libc: Incorrect declaration for 32-bit platforms with
4140 _FILE_OFFSET_BITS=64 causes build error
4141 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
4142 not support gethostbyname4_r
4143 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
4145 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
4147 [21340] libc: Support POSIX_SPAWN_SETSID
4148 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
4149 [21359] network: ns_name_pack needs additional byte in destination buffer
4150 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
4151 against fragmentation attacks (CVE-2017-12132)
4152 [21369] network: resolv: Remove EDNS fallback
4153 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
4155 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
4156 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
4157 [21393] stdio: Missing dup3 error check in freopen, freopen64
4158 [21396] libc: Use AVX2 memcpy/memset on Skylake server
4159 [21399] localedata: Bad description for U00EC in
4160 localedata/charmaps/CP1254
4161 [21411] malloc: realloc documentation error
4162 [21426] network: sys/socket.h uio.h namespace
4163 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
4164 [21445] libc: signal.h bsd_signal namespace
4165 [21455] network: Network headers stdint.h namespace
4166 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
4168 [21475] network: resolv: Overlong search path is truncated mid-label
4169 [21511] libc: sigstack namespace
4170 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
4171 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
4172 bits/syscall.h: No such file or directory
4173 [21517] libc: struct sigaltstack namespace
4174 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
4175 [21533] localedata: Update locale data to Unicode 10.0
4177 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
4178 junk at end of line, first unrecognized character is `@'
4179 [21538] libc: SIG_HOLD missing for XPG4
4180 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
4181 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
4182 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
4183 [21543] libc: sigevent namespace
4184 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
4185 size for general purpose registers in mcontext_t structure
4186 [21550] libc: sigwait namespace
4187 [21552] libc: XPG4 bsd_signal namespace
4188 [21554] libc: sigpause namespace
4189 [21560] libc: sys/wait.h signal.h namespace
4190 [21561] libc: waitid namespace
4191 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
4192 '/usr/include/stdlib.h': Permission denied
4193 [21575] libc: sys/wait.h missing struct rusage definition
4194 [21584] libc: sigaltstack etc namespace
4195 [21597] libc: siginterrupt namespace
4196 [21607] math: hppa: FAIL: math/test-tgmath
4197 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
4199 [21622] libc: [tile] missing SA_* for POSIX.1:2008
4200 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
4201 stack and heap (CVE-2017-1000366)
4202 [21625] libc: wait3 namespace
4203 [21654] nss: Incorrect pointer alignment in NSS group merge result
4205 [21657] network: Parse interface zone id for node-local multicast
4206 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
4208 [21666] libc: .symver is used on common symbol
4209 [21668] network: resolv: res_init cross-thread broadcast introduces race
4211 [21687] math: tgmath.h totalorder, totalordermag return type
4212 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
4214 [21696] libc: Incorrect assumption of of __cpu_mask in
4215 posix/sched_cpucount.c
4216 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
4217 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
4219 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
4220 leading to relocation crash
4221 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
4222 `resolv_conf_matches (resp, conf)' failed.
4223 [21710] localedata: Added Samoan language locale for Samoa
4224 [21711] localedata: Pashto yesstr/nostr locale are missing
4225 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
4226 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
4227 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
4228 [21723] localedata: yesstr/nostr missing for Chinese language locale
4229 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
4231 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
4233 [21728] localedata: New Locale for Tongan language
4234 [21729] localedata: incorrect LC_NAME fields for hi_IN
4235 [21733] localedata: yesstr and nostr are missing for zh_HK
4236 [21734] localedata: Missing yesstr and nostr are for kw_GB
4237 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
4238 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
4239 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
4240 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
4242 [21744] libc: Tests failing on --enable-tunables --enable-stack-
4244 [21749] localedata: Wrong abbreviated day name (“abday”) for
4246 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
4247 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
4248 [21759] localedata: missing yesstr and nostr for Tigrinya
4249 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
4250 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
4251 [21767] localedata: Missing Bislama locales
4252 [21768] localedata: Missing yesstr and nostr for aa_ET
4253 [21770] localedata: Missing Field in li_NL
4254 [21778] nptl: Robust mutex may deadlock
4255 [21779] libc: MicroBlaze segfaults when loading libpthread
4256 [21783] localedata: Fix int_select international_call_prefixes
4257 [21784] localedata: Inconsistency in country_isbn
4258 [21788] localedata: Missing Country Postal Abbreviations
4259 [21794] localedata: Added-country_isbn-for-Italy
4260 [21795] localedata: Add/Fix country_isbn for France
4261 [21796] localedata: Added country_isbn for Republic of Korea
4262 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
4263 [21799] localedata: Added int_select international_call_prefixes
4264 [21801] localedata: Added int_select international_call_prefixes
4265 [21804] nptl: Double semicolon in thread-shared-types.h
4266 [21807] localedata: LC_ADDRESS fix for pap_CW
4267 [21808] localedata: Fix LC_ADDRESS for pap_AW
4268 [21821] localedata: Added country_name in mai_IN
4269 [21822] localedata: Fix LC_TIME for mai_IN
4270 [21823] localedata: missing yesstr, nostr for sa_IN
4271 [21825] localedata: Fix name_mrs for mag_IN
4272 [21828] localedata: 2.26 changelog should mention user visible changes
4274 [21835] localedata: Added Maithili language locale for Nepal
4275 [21838] localedata: Removed redundant data for the_NP
4276 [21839] localedata: Fix LC_MONETARY for ta_LK
4277 [21844] localedata: Fix Latin characters and Months Sequence.
4278 [21848] localedata: Fix mai_NP Title Name
4283 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
4284 24731-2:2010, is supported to enable declarations of functions from that
4285 TR. Note that not all functions from that TR are supported by the GNU C
4288 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
4289 18661-1:2014, is supported to enable declarations of functions and macros
4290 from that TS. Note that not all features from that TS are supported by
4293 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
4294 18661-4:2015, is supported to enable declarations of functions and macros
4295 from that TS. Note that most features from that TS are not supported by
4298 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
4299 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
4300 Since the GNU C Library defaults to a much newer revision of POSIX, this
4301 will only affect programs that specifically request an old conformance
4302 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
4303 see a change in the visible declarations, but a program compiled with
4304 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
4307 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
4308 defined by all multithreaded code, but glibc has not required this for
4311 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
4312 means that in a future release, the macros “major”, “minor”, and “makedev”
4313 will only be available from <sys/sysmacros.h>.
4315 These macros are not part of POSIX nor XSI, and their names frequently
4316 collide with user code; see for instance glibc bug 19239 and Red Hat bug
4317 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
4318 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
4321 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
4322 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
4323 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
4325 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
4326 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
4327 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
4328 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
4329 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
4330 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
4331 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
4332 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
4333 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
4334 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
4335 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
4338 * New <math.h> features are added from TS 18661-1:2014:
4340 - Signaling NaN macros: SNANF, SNAN, SNANL.
4342 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
4343 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
4344 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
4346 - llogb functions: the llogb, llogbf and llogbl functions, and the
4347 FP_LLOGB0 and FP_LLOGBNAN macros.
4349 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
4352 - Comparison macros: iseqsig.
4354 - Classification macros: iscanonical, issubnormal, iszero.
4356 - Total order functions: totalorder, totalorderf, totalorderl,
4357 totalordermag, totalordermagf, totalordermagl.
4359 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
4361 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
4362 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
4364 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
4365 are added to libc. They convert a floating-point number into string.
4367 * Most of glibc can now be built with the stack smashing protector enabled.
4368 It is recommended to build glibc with --enable-stack-protector=strong.
4369 Implemented by Nick Alcock (Oracle).
4371 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
4372 intended to be used instead of memset() to erase sensitive data after use;
4373 the compiler will not optimize out calls to explicit_bzero even if they
4374 are "unnecessary" (in the sense that no _correct_ program can observe the
4375 effects of the memory clear).
4377 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
4378 to float instead of double. This does not affect the ABI of any libraries
4379 that are part of the GNU C Library, but may affect the ABI of other
4380 libraries that use this type in their interfaces.
4382 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
4383 float_t and double_t types are now defined to long double instead of float
4384 and double. These options are not the default, and this does not affect
4385 the ABI of any libraries that are part of the GNU C Library, but it may
4386 affect the ABI of other libraries that use this type in their interfaces,
4387 if they are compiled or used with those options.
4389 * The getentropy and getrandom functions, and the <sys/random.h> header file
4392 * The buffer size for byte-oriented stdio streams is now limited to 8192
4393 bytes by default. Previously, on Linux, the default buffer size on most
4394 file systems was 4096 bytes (and thus remains unchanged), except on
4395 network file systems, where the buffer size was unpredictable and could be
4396 as large as several megabytes.
4398 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
4399 for the Linux quota interface which predates kernel version 2.4.22 has
4402 * The malloc_get_state and malloc_set_state functions have been removed.
4403 Already-existing binaries that dynamically link to these functions will
4404 get a hidden implementation in which malloc_get_state is a stub. As far
4405 as we know, these functions are used only by GNU Emacs and this change
4406 will not adversely affect already-built Emacs executables. Any undumped
4407 Emacs executables, which normally exist only during an Emacs build, should
4408 be rebuilt by re-running “./configure; make” in the Emacs build tree.
4410 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
4411 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
4412 “no-ip6-dotint” had already been the default, and support for the
4413 “ip6-dotint” option was removed from the Internet in 2006.
4415 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
4416 flag from <resolv.h> have been removed. The option relied on a
4417 backwards-incompatible DNS extension which was never deployed on the
4420 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
4421 RES_BLAST defined in the <resolv.h> header file have been deprecated.
4422 They were already unimplemented.
4424 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
4425 _res.flags are deprecated. The flag was standardized in RFC 2133, but
4426 removed again from the IETF name lookup interface specification in RFC
4427 2553. Applications should use getaddrinfo instead.
4429 * DNSSEC-related declarations and definitions have been removed from the
4430 <arpa/nameser.h> header file, and libresolv will no longer attempt to
4431 decode the data part of DNSSEC record types. Previous versions of glibc
4432 only implemented minimal support for the previous version of DNSSEC, which
4433 is incompatible with the currently deployed version.
4435 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
4436 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
4437 <arpa/nameser.h> header file because the distinction between RR types and
4438 meta-RR types is not officially standardized, subject to revision, and
4439 thus not suitable for encoding in a macro.
4441 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
4442 and rhook members of the res_state type in <resolv.h> have been removed.
4443 The glibc stub resolver did not support these hooks, but the header file
4444 did not reflect that.
4446 * For multi-arch support it is recommended to use a GCC which has
4447 been built with support for GNU indirect functions. This ensures
4448 that correct debugging information is generated for functions
4449 selected by IFUNC resolvers. This support can either be enabled by
4450 configuring GCC with '--enable-gnu-indirect-function', or by
4451 enabling it by default by setting 'default_gnu_indirect_function'
4452 variable for a particular architecture in the GCC source file
4455 * GDB pretty printers have been added for mutex and condition variable
4456 structures in POSIX Threads. When installed and loaded in gdb these pretty
4457 printers show various pthread variables in human-readable form when read
4458 using the 'print' or 'display' commands in gdb.
4460 * Tunables feature added to allow tweaking of the runtime for an application
4461 program. This feature can be enabled with the '--enable-tunables' configure
4462 flag. The GNU C Library manual has details on usage and README.tunables has
4463 instructions on adding new tunables to the library.
4465 * A new version of condition variables functions have been implemented in
4466 the NPTL implementation of POSIX Threads to provide stronger ordering
4469 * A new version of pthread_rwlock functions have been implemented to use a more
4470 scalable algorithm primarily through not using a critical section anymore to
4473 Security related changes:
4475 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4476 have been created with makecontext could fail to terminate due to a
4477 missing .cantunwind annotation. This has been observed to lead to a hang
4478 (denial of service) in some Go applications compiled with gccgo. Reported
4479 by Andreas Schwab. (CVE-2016-6323)
4481 * The DNS stub resolver functions would crash due to a NULL pointer
4482 dereference when processing a query with a valid DNS question type which
4483 was used internally in the implementation. The stub resolver now uses a
4484 question type which is outside the range of valid question type values.
4487 The following bugs are resolved with this release:
4489 [4099] stdio: Overly aggressive caching by stream i/o functions.
4490 [7065] build: Support building glibc with -fstack-protector or -fstack-
4492 [9842] localedata: en_CA: incorrect date format
4493 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4494 before it started waiting
4495 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4496 [15765] nptl: sem_open is wrongly a cancellation point
4497 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4498 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4500 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4501 library linked with pthread
4502 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4503 "FIXME: Ingo" issue)
4504 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4505 [17252] libc: getrandom and getentropy syscall
4506 [17730] malloc: thread-local storage is sometimes improperly free()'d
4507 after being __libc_memalign()'d
4508 [18241] stdio: failed fseek on memstream does not set errno and can fail
4510 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4512 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4513 PTHREAD_PRIO_INHERIT mutex on ARM
4514 [18784] network: res_query and related function crash for special record
4515 type queries (CVE-2015-5180)
4516 [19380] math: strtod does not raise "inexact"
4517 [19387] string: Integer overflow in memchr
4518 [19390] string: Integer overflow in strncat
4519 [19398] build: linknamespace tests fail with massively parallel build
4520 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4522 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4523 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4524 [19514] libc: [PATCH] Fix spelling errors in spelling
4525 "implement"/"implementation" in several places
4526 [19582] network: Deprecate RES_USE_INET6
4527 [19673] manual: clog10 docs appear to be erroneous
4528 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4529 causes a segmentation fault
4530 [19826] libc: invalid pointer returned from __tls_get_addr with static
4532 [20016] network: resolv: Remove hooks support from the API
4533 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4535 [20033] math: [x86_64] vectorized math function don't call the __finite
4537 [20116] nptl: use after free in pthread_create
4538 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4539 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4541 [20311] nptl: please install proc_service.h
4542 [20366] libc: Compilation errors in installed headers in strict-compliance
4544 [20370] malloc: malloc: Arena free list management is still racy
4545 (incorrect fix in bug 19243)
4546 [20386] libc: assert (X = 0) does not result in GCC warning
4547 [20432] malloc: malloc: Minimize interface required for interposition
4548 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4549 in _Unwind_Backtrace (CVE-2016-6323)
4550 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4551 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4553 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4554 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4555 [20477] network: resolv: incorrect double-checked locking related to
4557 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4559 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4561 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4562 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4563 cause transition penalty
4564 [20517] math: sparcv9 missing fdiml compat symbol
4565 [20524] manual: strverscmp is inconsistent
4566 [20525] libc: <sys/quota.h> should be based on kernel headers
4567 [20539] math: GCC 7 -static -lm fails to link at -O3
4568 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4570 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4572 [20591] network: Remove obsolete DNSSEC support
4573 [20592] network: DNS resource record type classification macros in
4574 <arpa/nameser.h> are incorrect
4575 [20593] network: Update DNS RR type definitions
4576 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4577 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4579 [20629] network: libresolv: Remove support for bitstring labels
4581 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4582 assertion: "maxidx >= 2"
4583 [20660] math: [arm] Use VSQRT
4584 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4585 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4586 [20689] libc: Test for FMA should also check for AVX.
4587 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4588 [20715] math: iszero macro breaks existing code
4589 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4590 [20728] libc: powerpc: Missing TOC stub in clone
4591 [20729] build: glibc-2.24 fails to build for i486 with -Os
4592 [20750] build: Build fails with default PIE enabled gcc-6.x
4593 [20768] math: [alpha] sqrt fegetenv namespace
4594 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4596 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4597 __FLT_EVAL_METHOD__ is 2
4598 [20790] network: rpcgen buffer overrun in get_prog_declaration
4599 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4600 [20829] libc: crypt snprintf namespace
4601 [20847] libc: tst-vfork3 failure
4602 [20855] math: Default bits/mathdef.h has inappropriate float_t
4603 [20859] math: [sh4] FP_ILOGB0 invalid
4604 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4605 U+20AC), not same as GBK
4606 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4607 [20916] math: pow handling of sNaN arguments
4608 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4609 [20919] math: Bad pow (qNaN, 0) result with -lieee
4610 [20940] math: hypot sNaN handling
4611 [20947] math: fmax, fmin sNaN handling
4612 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4613 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4615 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4616 [20973] nptl: robust mutexes: Lost wake-ups
4617 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4618 [20978] nis: strlen on null pointer in nss_nisplus
4619 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4621 [21014] string: i686 memchr overflows internal pointer check
4622 [21019] libc: [mips] n32 lseek incorrect on overflow
4623 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4624 [21026] libc: [MIPS] readahead syscall is broken on n64
4625 [21028] math: Fallback fesetexceptflag should always succeed
4626 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4627 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4629 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4630 [21061] librt: [microblaze] librt lost clock_* exports
4631 [21073] libc: tunables: insecure environment variables passed to
4632 subprocesses with AT_SECURE
4633 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4637 * The minimum Linux kernel version that this version of the GNU C Library
4638 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4639 kernel version 2.6.32 or later suffices (on architectures that already
4640 required kernel versions more recent than 3.2, those requirements remain
4641 unchanged). Linux 3.2 or later kernel headers are required on all
4644 * The pap_AN locale has been deleted. This has been deprecated for a long
4645 time. It has been replaced by pap_AW & pap_CW, both of which have long
4646 been included in previous releases.
4648 * The readdir_r and readdir64_r functions have been deprecated. It is
4649 recommended to use readdir and readdir64 instead.
4651 * The type “union wait” has been removed. It was deprecated in the early
4652 1990s and never part of POSIX. Application code should use the int type
4653 instead of “union wait”.
4655 * A new NSS action is added to facilitate large distributed system
4656 administration. The action, MERGE, allows remote user stores like LDAP
4657 to be merged into local user stores like /etc/groups in order to provide
4658 easy to use, updated, and managed sets of merged credentials. The new
4659 action can be used by configuring it in /etc/nsswitch.conf:
4660 group: files [SUCCESS=merge] nis
4661 Implemented by Stephen Gallagher (Red Hat).
4663 * The deprecated __malloc_initialize_hook variable has been removed from the
4666 * The long unused localedef --old-style option has been removed. It hasn't
4667 done anything in over 16 years. Scripts using this option can safely
4670 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4671 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4672 return the next representable value in the direction of positive infinity
4673 and the nextdown functions return the next representable value in the
4674 direction of negative infinity. These are currently enabled as GNU
4677 Security related changes:
4679 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4680 could result in a stack overflow when getnetbyname was called with an
4681 overly long name. (CVE-2016-3075)
4683 * Previously, getaddrinfo copied large amounts of address data to the stack,
4684 even after the fix for CVE-2013-4458 has been applied, potentially
4685 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4686 instead. Reported by Michael Petlan. (CVE-2016-3706)
4688 * The glob function suffered from a stack-based buffer overflow when it was
4689 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4690 Reported by Alexander Cherepanov. (CVE-2016-1234)
4692 * The Sun RPC UDP client could exhaust all available stack space when
4693 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4694 alloca plugin for GCC. (CVE-2016-4429)
4696 * The IPv6 name server management code in libresolv could result in a memory
4697 leak for each thread which is created, performs a failing naming lookup,
4698 and exits. Over time, this could result in a denial of service due to
4699 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4701 The following bugs are resolved with this release:
4703 [1170] localedata: ne_NP: update Nepali locale definition file
4704 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4706 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4707 [6796] math: fdim() does not set errno on overflow
4708 [10354] libc: posix_spawn should use vfork() in more cases than presently
4709 [11213] localedata: localedata: add copyright disclaimer to locale files
4710 [12143] localedata: chr_US: new Cherokee locale
4711 [12450] localedata: sgs_LT: new locale
4712 [12676] localedata: ln_CD: new locale
4713 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4715 [13304] math: fma, fmaf, fmal produce wrong results
4716 [14259] build: --localedir arg to configure is ignored
4717 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4718 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4719 [14934] localedata: es_CL: wrong first weekday chilean locale
4720 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4722 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4724 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4725 [15368] nptl: raise() is not async-signal-safe
4726 [15479] math: ceil, floor, round and trunc raise inexact exception
4727 [15578] localedata: kk_KZ: various updates
4728 [16003] localedata: pap_AN: punt old locale
4729 [16137] localedata: iw_IL: punt old locale
4730 [16190] localedata: eo: new esperanto locale
4731 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4732 [16742] malloc: race condition: pthread_atfork() called before first
4733 malloc() results in unexpected locking behaviour/deadlocks
4734 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4736 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4737 [17565] localedata: pt_PT: wrong (work-)week start
4738 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4739 [17950] build: Build fails with -msse
4740 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4741 [18433] libc: posix_spawn does not return correctly upon failure to
4743 [18453] localedata: charmaps/IBM875: incorrect codes
4744 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4746 [18896] localedata: he_IL: improvements for currency
4747 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4748 Romanian locale data
4749 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4751 [19056] libc: Deprecate readdir_r
4752 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4754 [19198] localedata: nl_NL: small improvements for Dutch locales
4755 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4756 nameservers (CVE-2016-5417)
4757 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4759 [19400] locale: Language missing in "iso-639.def", trivial fix in
4761 [19431] malloc: Deadlock between fflush, getdelim, and fork
4762 [19505] libc: Incorrect file descriptor validity checks in
4763 posix_spawn_file_actions_add{open,close,dup2}
4764 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4765 when using RTLD_NEXT
4766 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4767 `intl/{gettextP,loadinfo}.h'
4768 [19534] libc: execle, execlp may use malloc
4769 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4770 [19573] network: res_nclose and __res_maybe_init disagree about name
4771 server initialization, breaking Hesiod
4772 [19575] localedata: Status of GB18030 tables
4773 [19581] localedata: sr_* date_fmt string contains additional newline
4774 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4776 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4777 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4778 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4779 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4781 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4783 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4785 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4786 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4787 [19633] locale: strfmon_l applies global locale to number formatting
4788 [19642] network: Memory leak in getnameinfo
4789 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4790 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4792 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4793 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4795 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4796 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4798 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4800 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4802 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4803 pointers and lengths in error-case.
4804 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4805 report errors on UTF-16 surrogates values.
4806 [19755] nscd: nscd assertion failure in gc
4807 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4808 [19759] libc: mempcpy shouldn't be inlined
4809 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4810 [19765] libc: s390 needs an optimized mempcpy
4811 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4812 NAME_MAX limit assumption (CVE-2016-1234)
4813 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4814 [19787] network: Missing and incorrect truncation checks in getnameinfo
4815 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4817 [19791] network: Assertion failure in res_query.c with un-connectable name
4819 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4820 [19822] math: libm.so install clobbers old version
4821 [19825] network: resolv: send_vc can return uninitialized data in second
4822 response to getaddrinfo
4823 [19830] network: nss_dns: should check RDATA length against buffer length
4824 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4825 confronted with A/AAAA records of invalid size
4826 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4827 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4828 [19853] stdio: Printing IBM long double in decimal with high precision is
4830 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4831 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4832 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4834 [19865] network: Assertion failure or memory leak in
4835 _nss_dns_getcanonname_r
4836 [19868] network: nss_dns: netent code does not skip over non-PTR records
4837 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4839 [19881] string: Improve x86-64 memset
4840 [19907] string: Incorrect memcpy tests
4841 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4843 [19925] libc: termios.h XCASE namespace
4844 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4845 [19929] libc: limits.h NL_NMAX namespace
4846 [19931] stdio: Memory leak in vfprintf
4847 [19957] libc: clone(CLONE_VM) access invalid parent memory
4848 [19963] localedata: en_IL: New locale
4849 [19989] stdio: stdio.h cuserid namespace
4850 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4852 [19996] locale: langinfo.h nl_langinfo_l namespace
4853 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4854 [20010] network: getaddrinfo: Stack overflow in hostent translation
4856 [20012] stdio: libio: fmemopen append mode failure
4857 [20014] stdio: stdio.h namespace for pre-threads POSIX
4858 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4859 [20023] libc: fcntl.h timespec namespace
4860 [20024] math: [x86_64] vectorized sincos trashes the stack
4861 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4862 [20041] time: sys/time.h timespec namespace
4863 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4864 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4865 [20051] libc: ttyslot in wrong header under wrong conditions
4866 [20054] libc: gethostname not declared for XPG4
4867 [20055] libc: termios.h missing tcgetsid for XPG4
4868 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4870 [20073] libc: sys/stat.h fchmod namespace
4871 [20074] libc: stdlib.h rand_r namespace
4872 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4873 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4875 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4876 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4878 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4879 [20119] libc: Wrong mask for processors level type from CPUID
4880 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4881 AS not supporting AVX512
4882 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4884 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4885 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4887 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4888 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4889 [20178] libc: posix_spawn{p} should not call exit
4890 [20191] stdio: libio: vtables hardening
4891 [20195] string: FMA4 detection requires CPUID execution with register
4893 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4894 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4896 [20212] math: acos (sNaN) returns sNaN
4897 [20213] math: asin (sNaN) returns sNaN
4898 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4899 [20218] math: [i386] asinhl (sNaN) returns sNaN
4900 [20219] math: [i386] atanhl (sNaN) returns sNaN
4901 [20222] stdio: fopencookie: Mangle function pointers
4902 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4903 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4904 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4906 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4907 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4908 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4909 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4910 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4911 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4912 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4913 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4914 [20240] math: modf (sNaN) returns sNaN
4915 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4916 [20250] math: frexp (sNaN) returns sNaN
4917 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4918 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4920 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4921 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4922 subscript is below array bounds [-Werror=array-bounds]
4923 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4924 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4926 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4927 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4929 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4930 "invalid" exceptions
4931 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4932 [20316] localedata: id_ID: Februari instead of Pebruari
4933 [20327] string: POWER8 strcasecmp returns incorrect result
4934 [20347] math: Failure: Test: j0_downward (0xap+0)
4935 [20348] libc: FAIL: misc/tst-preadvwritev64
4936 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4937 [20350] libc: There is no test for p{read,write}64
4938 [20357] math: Incorrect cos result for 1.5174239687223976
4939 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4943 * Unicode 8.0.0 Support: Character encoding, character type info, and
4944 transliteration tables are all updated to Unicode 8.0.0, using new
4945 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4946 These updates cause user visible changes, such as the fixes for bugs
4947 89, 16061, and 18568.
4949 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4950 kernel-internal CPU set size. This means that requests that change the
4951 CPU affinity which failed before (for example, an all-ones CPU mask) will
4952 now succeed. Applications that need to determine the effective CPU
4953 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4954 setting it because the kernel can adjust it (and the previous size check
4955 would not detect this in the majority of cases).
4957 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4958 the following new symbols are used: fts64_children, fts64_close,
4959 fts64_open, fts64_read and fts64_set.
4961 * getaddrinfo now detects certain invalid responses on an internal netlink
4962 socket. If such responses are received, an affected process will
4963 terminate with an error message of "Unexpected error <number> on netlink
4964 descriptor <number>" or "Unexpected netlink response of size <number> on
4965 descriptor <number>". The most likely cause for these errors is a
4966 multi-threaded application which erroneously closes and reuses the netlink
4967 file descriptor while it is used by getaddrinfo.
4969 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4970 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4971 unnecessary serialization of memory allocation requests across threads.
4972 The defect is now corrected. Users should see a substantial increase in
4973 the concurrent throughput of allocation requests for applications which
4974 trigger this bug. Affected applications typically create and
4975 destroy threads frequently. (Bug 19048 was reported and analyzed by
4978 * There is now a --disable-timezone-tools configure option for disabling the
4979 building and installing of the timezone related utilities (zic, zdump, and
4980 tzselect). This is useful for people who build the timezone data and code
4981 independent of the GNU C Library.
4983 * The obsolete header <regexp.h> has been removed. Programs that require
4984 this header must be updated to use <regex.h> instead.
4986 * The obsolete functions bdflush, create_module, get_kernel_syms,
4987 query_module and uselib are no longer available to newly linked binaries;
4988 the header <sys/kdaemon.h> has been removed. These functions and header
4989 were specific to systems using the Linux kernel and could not usefully be
4990 used with the GNU C Library on systems with version 2.6 or later of the
4993 * Optimized string, wcsmbs and memory functions for IBM z13.
4994 Implemented by Stefan Liebler.
4996 * Newly linked programs that define a variable called signgam will no longer
4997 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4998 require signgam to be set by those functions must ensure that they use the
4999 variable provided by the GNU C Library and declared in <math.h>, without
5000 defining their own copy.
5002 * The minimum GCC version that can be used to build this version of the GNU
5003 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
5004 still be used to compile programs using the GNU C Library.
5006 Security related changes:
5008 * An out-of-bounds value in a broken-out struct tm argument to strftime no
5009 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
5011 * The LD_POINTER_GUARD environment variable can no longer be used to disable
5012 the pointer guard feature. It is always enabled. Previously,
5013 LD_POINTER_GUARD could be used to disable security hardening in binaries
5014 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
5017 * An integer overflow in hcreate and hcreate_r could lead to an
5018 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
5020 * The catopen function no longer has unbounded stack usage. Reported by
5021 Max. (CVE-2015-8779)
5023 * The nan, nanf and nanl functions no longer have unbounded stack usage
5024 depending on the length of the string passed as an argument to the
5025 functions. Reported by Joseph Myers. (CVE-2014-9761)
5027 * A stack-based buffer overflow was found in libresolv when invoked from
5028 libnss_dns, allowing specially crafted DNS responses to seize control
5029 of execution flow in the DNS client. The buffer overflow occurs in
5030 the functions send_dg (send datagram) and send_vc (send TCP) for the
5031 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
5032 family. The use of AF_UNSPEC triggers the low-level resolver code to
5033 send out two parallel queries for A and AAAA. A mismanagement of the
5034 buffers used for those queries could result in the response of a query
5035 writing beyond the alloca allocated buffer created by
5036 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
5037 the overflow. Thanks to the Google Security Team and Red Hat for
5038 reporting the security impact of this issue, and Robert Holiday of
5039 Ciena for reporting the related bug 18665. (CVE-2015-7547)
5041 The following bugs are resolved with this release:
5043 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
5044 [887] math: Math library function "logb" and "nextafter" inconsistent
5045 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
5046 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
5047 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
5048 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
5050 [4404] localedata: German translation of "Alarm clock" is misleading
5051 [6799] math: nextafter() and nexttoward() doesn't set errno on
5052 overflow/underflow errors
5053 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
5055 [10432] nis: _nss_nis_setnetgrent assertion failure
5056 [11460] libc: fts has no LFS support
5057 [12926] network: getaddrinfo()/make_request() may spin forever
5058 [13065] nptl: Race condition in pthread barriers
5059 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
5060 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
5062 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
5063 [14912] libc: Rename non-installed bits/*.h headers
5064 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
5065 [15367] math: Let gcc use __builtin_isinf
5066 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
5067 [15421] math: lgamma wrongly sets signgam for ISO C
5068 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
5069 FE_INVALID with argument out of range
5070 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
5072 [15786] dynamic-link: ifunc resolver functions can smash function
5074 [15918] math: Unnecessary check for equality in hypotf()
5075 [16061] localedata: Review / update transliteration data
5076 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
5078 [16141] time: strptime %z offset restriction
5079 [16171] math: drem should be alias of remainder
5080 [16296] math: fegetround is pure?
5081 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
5082 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
5084 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
5085 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
5087 [16422] math: [powerpc] math-float, math-double failing llrint tests with
5088 "Exception "Inexact" set" on ppc32
5089 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
5090 [16517] math: Missing underflow exception from tanf/tan/tanl
5091 [16519] math: Missing underflow exception from sinhf
5092 [16520] math: Missing underflow exception from tanhf
5093 [16521] math: Missing underflow exception from exp2
5094 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
5096 [16734] stdio: fopen calls mmap to allocate its buffer
5097 [16961] math: nan function incorrect handling of bad sequences
5098 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
5099 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
5100 [16985] locale: localedef: confusing error message when opening output
5102 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
5103 [17197] locale: Redundant shift character in iconv conversion output at
5105 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
5106 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
5107 [17250] dynamic-link: static linking breaks nss loading
5108 (getaddrinfo/getpwnam/etc...)
5109 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
5111 [17441] math: isnan() should use __builtin_isnan() in GCC
5112 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
5113 (related to lock elision)
5114 [17787] manual: Exponent on page 324 of the PDF ends prematurely
5115 [17886] time: strptime should be able to parse "Z" as a timezone with %z
5116 [17887] time: strptime should be able to parse "+01:00" style timezones
5117 [17905] libc: catopen() Multiple unbounded stack allocations
5119 [18084] libc: backtrace (..., 0) dumps core on x86
5120 [18086] libc: nice() sets errno to 0 on success
5121 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
5122 is too large (CVE-2015-8778)
5123 [18251] dynamic-link: SONAME missing when audit modules provides path
5124 [18265] libc: add attributes for wchar string and memory functions
5125 [18370] math: csqrt missing underflows
5126 [18421] libc: [hppa] read-only segment has dynamic relocations
5127 [18472] libc: Obsolete syscall wrappers should be compat symbols
5128 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
5129 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
5130 [18525] localedata: Remove locale timezone information
5131 [18560] libc: [powerpc] spurious bits/ipc.h definitions
5132 [18568] localedata: Update locale data to Unicode 8.0
5133 [18589] locale: sort-test.sh fails at random
5134 [18595] math: ctan, ctanh missing underflows
5135 [18604] libc: assert macro-expands its argument
5136 [18610] math: S390: fetestexcept() reports any exception if DXC-code
5137 contains a vector instruction exception.
5138 [18611] math: j1, jn missing errno setting on underflow
5139 [18618] localedata: sync Chechen locale definitions with other *_RU
5141 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
5142 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
5143 [18665] network: In send_dg, the recvfrom function is NOT always using the
5144 buffer size of a newly created buffer (CVE-2015-7547)
5145 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
5147 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
5149 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
5150 [18699] math: tilegx cproj() for various complex infinities does not yield
5152 [18724] libc: Harden put*ent functions against data injection
5153 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
5154 [18755] build: build errors with -DNDEBUG
5155 [18757] stdio: fmemopen fails to set errno on failure
5156 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
5158 [18781] libc: openat64 lacks O_LARGEFILE
5159 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
5160 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
5161 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
5162 [18790] math: [ldbl-128ibm] tanhl inaccurate
5163 [18795] libc: stpncpy fortification misses buffer lengths that are
5164 statically too large
5165 [18796] build: build fails for --disable-mathvec
5166 [18803] math: hypot missing underflows
5167 [18820] stdio: fmemopen may leak memory on failure
5168 [18823] math: csqrt spurious underflows
5169 [18824] math: fma spurious underflows
5170 [18825] math: pow missing underflows
5171 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
5172 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
5173 [18870] build: sem_open.c fails to compile with missing symbol
5175 [18872] stdio: Fix memory leak in printf_positional
5176 [18873] libc: posix_fallocate overflow check ineffective
5177 [18875] math: Excess precision leads incorrect libm
5178 [18877] libc: arm: mmap offset regression
5179 [18887] libc: memory corruption when using getmntent on blank lines
5180 [18918] localedata: hu_HU: change time to HH:MM:SS format
5181 [18921] libc: Regression: extraneous stat() and fstat() performed by
5183 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
5184 binaries (CVE-2015-8777)
5185 [18951] math: tgamma missing underflows
5186 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
5188 [18953] localedata: lt_LT: change currency symbol to the euro
5189 [18956] math: powf inaccuracy
5190 [18961] math: [i386] exp missing underflows
5191 [18966] math: [i386] exp10 missing underflows
5192 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
5193 [18969] build: multiple string test failures due to missing locale
5195 [18970] libc: Reference of pthread_setcancelstate in libc.a
5196 [18977] math: float / long double Bessel functions not in XSI POSIX
5197 [18980] math: i386 libm functions return with excess range and precision
5198 [18981] math: i386 scalb*, ldexp return with excess range and precision
5199 [18982] stdio: va_list and vprintf
5200 [18985] time: Passing out of range data to strftime() causes a segfault
5202 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
5203 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
5204 [19012] locale: iconv_open leaks memory on error path
5205 [19016] math: clog, clog10 inaccuracy
5206 [19018] nptl: Mangle function pointers in tls_dtor_list
5207 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
5208 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
5209 [19048] malloc: malloc: arena free list can become cyclic, increasing
5211 [19049] math: [powerpc] erfc incorrect zero sign
5212 [19050] math: [powerpc] log* incorrect zero sign
5213 [19058] math: [x86_64] Link fail with -fopenmp and -flto
5214 [19059] math: nexttoward overflow incorrect in non-default rounding modes
5215 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
5216 [19074] network: Data race in _res_hconf_reorder_addrs
5217 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
5218 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
5219 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
5221 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
5223 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
5224 [19086] manual: posix_fallocate64 documented argument order is wrong.
5225 [19088] math: lround, llround missing exceptions close to overflow
5227 [19094] math: lrint, llrint missing exceptions close to overflow threshold
5228 [19095] math: dbl-64 lrint incorrect for 64-bit long
5229 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
5230 [19124] dynamic-link: ld.so failed to build with older assembler
5231 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
5232 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
5233 [19134] math: [powerpc32] lround, lroundf spurious exceptions
5234 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
5235 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
5236 pthread_setaffinity_np
5237 [19156] math: [ldbl-128] j0l spurious underflows
5238 [19164] nptl: tst-getcpu fails with many possible CPUs
5239 [19168] math: math/test-ildoubl and math/test-ldouble failure
5240 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
5241 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
5243 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
5244 (FE_NOMASK_ENV) do not clear SSE exceptions
5245 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
5246 _int_new_arena/reused_arena
5247 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
5248 [19201] math: dbl-64 remainder incorrect sign of zero result
5249 [19205] math: bits/math-finite.h conditions do not match math.h and
5251 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
5252 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
5253 for C99-based standards
5254 [19212] libc: features.h not -Wundef clean
5255 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
5257 [19214] libc: Family and model identification for AMD CPU's are incorrect.
5258 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
5259 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
5261 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
5262 "inexact" exceptions
5263 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
5265 [19242] libc: strtol incorrect in Turkish locales
5266 [19243] malloc: reused_arena can pick an arena on the free list, leading
5267 to an assertion failure and reference count corruption
5268 [19253] time: tzset() ineffective when temporary TZ did not include DST
5270 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
5271 [19270] math: [hppa] Shared libm missing __isnanl
5272 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
5273 MAP_HUGETLB and MAP_STACK defines
5274 [19313] nptl: Wrong __cpu_mask for x32
5275 [19347] libc: grantpt: try to force a specific gid even without pt_chown
5276 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
5277 [19350] math: [ldbl-128ibm] sinhl spurious overflows
5278 [19351] math: [ldbl-128ibm] logl inaccurate near 1
5279 [19363] time: x32: times() return value wrongly truncates/sign extends
5281 [19367] dynamic-link: Improve branch prediction on Silvermont
5282 [19369] network: Default domain name not reset by res_ninit when "search"
5283 / "domain" entry is removed from resolv.conf
5284 [19375] math: powerpc: incorrect results for POWER7 logb with negative
5286 [19385] localedata: bg_BG: time separator should be colon, not comma
5287 [19408] libc: linux personality syscall wrapper may erroneously return an
5288 error on 32-bit architectures
5289 [19415] libc: dladdr returns wrong names on hppa
5290 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
5291 IBM905, IBM907, and IBM909
5292 [19439] math: Unix98 isinf and isnan functions conflict with C++11
5293 [19443] build: build failures with -DDEBUG
5294 [19451] build: Make check fails on test-double-vlen2
5295 [19462] libc: Glibc failed to build with -Os
5296 [19465] math: Wrong code with -Os
5297 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
5299 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
5301 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
5302 [19486] math: S390: Math tests fail with "Exception Inexact set".
5303 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
5304 [19550] libc: [mips] mmap negative offset handling inconsistent with other
5306 [19590] math: Fail to build shared objects that use libmvec.so functions.
5310 * The following bugs are resolved with this release:
5312 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
5313 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
5314 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
5315 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
5316 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
5317 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
5318 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
5319 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
5320 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
5321 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
5322 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
5323 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
5324 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
5325 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
5326 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
5327 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
5328 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
5329 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
5330 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
5331 18657, 18676, 18694, 18696, 18887.
5333 * Cache information can be queried via sysconf() function on s390 e.g. with
5334 _SC_LEVEL1_ICACHE_SIZE as argument.
5336 * A buffer overflow in gethostbyname_r and related functions performing DNS
5337 requests has been fixed. If the NSS functions were called with a
5338 misaligned buffer, the buffer length change due to pointer alignment was
5339 not taken into account. This could result in application crashes or,
5340 potentially arbitrary code execution, using crafted, but syntactically
5341 valid DNS responses. (CVE-2015-1781)
5343 * The time zone file parser has been made more robust against crafted time
5344 zone files, avoiding heap buffer overflows related to the processing of
5345 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
5346 large time zone data files. Overly long time zone specifiers in the TZ
5347 variable no longer result in stack overflows and crashes.
5349 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
5350 for LD and GD on x86 and x86-64, has been implemented. You will need
5351 binutils-2.24 or later to enable this optimization.
5353 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
5354 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
5355 Hat). These updates cause user visible changes, such as the fix for bug
5358 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
5359 and getXXbyYY NSS calls for the same database, causing a denial-of-service
5360 condition in some applications.
5362 * Added vector math library named libmvec with the following vectorized x86_64
5363 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
5365 The library can be disabled with --disable-mathvec. Use of the functions is
5366 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
5367 Shared library libmvec.so is linked in as needed when using -lm (no need to
5368 specify -lmvec explicitly for not static builds).
5369 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
5371 * A new fmemopen implementation has been added with the goal of POSIX
5372 compliance. The new implementation fixes the following long-standing
5373 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
5374 old implementation is still present for use be by existing binaries.
5376 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
5377 releases. It has been fixed to match 2.19 and older, but binaries built
5378 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
5380 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
5381 Contributed by Roland McGrath (Google).
5383 * The header <regexp.h> is deprecated, and will be removed in a future
5384 release. Use of this header will trigger a deprecation warning.
5385 Application developers should update their code to use <regex.h> instead.
5387 This header was formerly part of SUS, but was deprecated in 1994 and
5388 removed from the standard in 2001. Also, the glibc implementation
5389 leaks memory. See BZ#18681 for more details.
5393 * The following bugs are resolved with this release:
5395 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
5396 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
5397 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
5398 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
5399 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
5400 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
5401 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
5402 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
5403 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
5404 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
5407 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
5408 too little memory for the to-be-scanned arguments and overflow the
5409 allocated buffer. The implementation now correctly computes the required
5410 buffer size when using malloc, and switches to malloc from alloca as
5413 * A new semaphore algorithm has been implemented in generic C code for all
5414 machines. Previous custom assembly implementations of semaphore were
5415 difficult to reason about or ensure that they were safe. The new version
5416 of semaphore supports machines with 64-bit or 32-bit atomic operations.
5417 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
5418 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
5420 * Port to Altera Nios II has been contributed by Mentor Graphics.
5422 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
5423 implementations for powerpc64/powerpc64le.
5424 Implemented by Adhemerval Zanella (IBM).
5426 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
5427 and powerpc64le. This may improve lock scaling of existing programs on
5428 HTM capable systems. The lock elision code is only enabled with
5429 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
5430 powerpc will issue a transaction abort on every syscall to avoid side
5431 effects being visible outside transactions.
5433 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
5434 AArch64. Contributed by ARM Ltd.
5436 * i386 memcpy functions optimized with SSE2 unaligned load/store.
5438 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
5439 under certain input conditions resulting in the execution of a shell for
5440 command substitution when the application did not request it. The
5441 implementation now checks WRDE_NOCMD immediately before executing the
5442 shell and returns the error WRDE_CMDSUB as expected.
5444 * CVE-2012-3406 printf-style functions could run into a stack overflow when
5445 processing format strings with a large number of format specifiers.
5447 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
5448 infinite loop if the DNS response contained a PTR record of an unexpected
5451 * The minimum GCC version that can be used to build this version of the GNU
5452 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
5453 still be used to compile programs using the GNU C Library.
5455 * The GNU C Library is now built with -Werror by default. This can be
5456 disabled by configuring with --disable-werror.
5458 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
5460 * The obsolete sigvec function has been removed. This was the original
5461 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
5462 programs have been using instead for about 25 years. Of course, ABI
5463 compatibility for old binaries using sigvec remains intact.
5465 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5466 with newer versions of bison.
5468 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5469 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5470 registers overlay two consecutive single-precision registers. MIPS32R2
5471 introduced a new FPU mode (FR=1) where double-precision registers extend the
5472 corresponding single-precision registers which is incompatible with the
5473 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5474 require the use of FR=1 making a transition necessary. New o32 ABI
5475 extensions enable users to migrate over time from the original o32 ABI
5476 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5477 tracks the ABI of any loaded object and verifies that new objects are
5478 compatible. Mode transitions will also be requested as required and
5479 unsupportable objects will be rejected. The ABI checks include both soft and
5480 hard float ABIs for o32, n32 and n64.
5482 GCC 5 with GNU binutils 2.25 onwards:
5483 It is strongly recommended that all o32 system libraries are built using the
5484 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5485 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5486 compiler using --with-fp-32=xx to set this by default.
5490 * The following bugs are resolved with this release:
5492 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5493 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5494 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5495 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5496 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5497 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5498 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5499 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5500 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5501 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5502 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5503 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5504 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5505 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5506 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5508 * Reverted change of ABI data structures for s390 and s390x:
5509 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5510 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5511 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5512 are preserved pointing straight to the same implementation as the old ones.
5513 Given that, new callers will simply provide a too-big buffer to these
5514 functions. Any applications/libraries out there that embed jmp_buf or
5515 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5516 against 2.19 headers will have to rebuilt again. This is necessary in any
5517 case to revert the breakage in their ABI caused by the glibc change.
5519 * Support for file description locks is added to systems running the
5520 Linux kernel. The standard file locking interfaces are extended to
5521 operate on file descriptions, not file descriptors, via the use of
5522 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5523 are associated with an open file instead of a process.
5525 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5527 * The minimum Linux kernel version that this version of the GNU C Library
5528 can be used with is 2.6.32.
5530 * Running the testsuite no longer terminates as soon as a test fails.
5531 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5532 with PASS or FAIL lines for individual tests. A summary of the results is
5533 printed, including a list of failing lists, and "make check" exits with
5534 error status if there were any unexpected failures. "make check
5535 stop-on-test-failure=y" may be used to keep the old behavior.
5537 * The am33 port, which had not worked for several years, has been removed
5540 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5541 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5542 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5543 conflicted with POSIX (support for which was removed in 2.19), the
5544 interfaces those macros enabled remain available when compiling with
5545 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5546 test macros defined.
5548 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5550 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5551 This may improve lock scaling of existing programs on TX capable systems.
5552 The lock elision code is only built with --enable-lock-elision=yes and
5553 then requires a GCC version supporting the TX builtins. With lock elision
5554 default mutexes are elided via __builtin_tbegin, if the cpu supports
5555 transactions. By default lock elision is not enabled and the elision code
5558 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5559 copy the path argument. This allowed programs to cause posix_spawn to
5560 deference a dangling pointer, or use an unexpected pathname argument if
5561 the string was modified after the posix_spawn_file_actions_addopen
5564 * All supported architectures now use the main glibc sysdeps directory
5565 instead of some being in a separate "ports" directory (which was
5566 distributed separately before glibc 2.17).
5568 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5569 On configurations that support it (all Linux configurations), it's now
5570 used regardless of the --enable-add-ons switch to configure. It is no
5571 longer possible to build such configurations without pthreads support.
5573 * Locale names, including those obtained from environment variables (LANG
5574 and the LC_* variables), are more tightly checked for proper syntax.
5575 setlocale will now fail (with EINVAL) for locale names that are overly
5576 long, contain slashes without starting with a slash, or contain ".." path
5577 components. (CVE-2014-0475) Previously, some valid locale names were
5578 silently replaced with the "C" locale when running in AT_SECURE mode
5579 (e.g., in a SUID program). This is no longer necessary because of the
5582 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5583 with application code using Intel MPX instructions. (With all previous
5584 versions, the MPX register state could be clobbered when making calls
5585 into or out of a shared library.) Note that while the new dynamic
5586 linker is compatible with all known x86 hardware whether or not it
5587 supports Intel MPX, some x86 instruction-set emulators might fail to
5588 handle the new instruction encodings. This is known to affect Valgrind
5589 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5590 release), and might affect other tools that do instruction emulation.
5592 * Support for loadable gconv transliteration modules has been removed.
5593 The support for transliteration modules has been non-functional for
5594 over a decade, and the removal is prompted by security defects. The
5595 normal gconv conversion modules are still supported. Transliteration
5596 with //TRANSLIT is still possible, and the //IGNORE specifier
5597 continues to be supported. (CVE-2014-5119)
5599 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5600 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5601 resulting a denial-of-service security vulnerability in applications which
5602 use functions related to iconv. (CVE-2014-6040)
5606 * The following bugs are resolved with this release:
5608 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5609 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5610 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5611 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5612 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5613 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5614 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5615 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5616 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5617 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5618 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5619 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5620 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5621 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5622 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5623 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5624 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5625 16431, 16453, 16474, 16506, 16510, 16529
5627 * Slovenian translations for glibc messages have been contributed by the
5628 Translation Project's Slovenian team of translators.
5630 * The public headers no longer use __unused nor __block. This change is to
5631 support compiling programs that are derived from BSD sources and use
5632 __unused internally, and to support compiling with Clang's -fblock
5633 extension which uses __block.
5635 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5636 large collation sequences to optimize multiple passes. This cache
5637 computation may overflow for large collation sequences and may cause a
5638 stack or buffer overflow. This is now fixed to use a slower algorithm
5639 which does not use a cache if there is an integer overflow.
5641 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5642 rules for large collation sequences to optimize multiple passes and falls
5643 back to alloca if malloc fails, resulting in a possible stack overflow.
5644 The implementation now falls back to an uncached collation sequence lookup
5647 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5648 initialized for static applications resulting in the security feature
5649 being disabled. The pointer guard is now correctly initialized to a
5650 random value for static applications. Existing static applications need
5651 to be recompiled to take advantage of the fix (bug 15754).
5653 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5654 to the d_name member of struct dirent, or omit the terminating NUL
5655 character. (Bugzilla #14699).
5657 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5658 aligned_alloc functions could allocate too few bytes or corrupt the
5659 heap when passed very large allocation size values (Bugzilla #15855,
5662 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5663 for AF_INET6 has been fixed (Bugzilla #16072).
5665 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5666 pap_CW, quz_PE, the_NP.
5668 * Substantially revised locales: gd_GB, ht_HT
5670 * The LC_ADDRESS field was updated to support country_car for almost all
5673 * ISO 1427 definitions were updated.
5675 * ISO 3166 definitions were updated.
5677 * The localedef utility now supports --big-endian and --little-endian
5678 command-line options to generate locales for a different system from that
5679 for which the C library was built.
5681 * Binary locale files now only depend on the endianness of the system for
5682 which they are generated and not on other properties of that system. As a
5683 consequence, binary files generated with new localedef may be incompatible
5684 with old versions of the GNU C Library, and binary files generated with
5685 old localedef may be incompatible with this version of the GNU C Library,
5686 in the following circumstances:
5688 + Locale files may be incompatible on m68k systems.
5690 + Locale archive files (but not separate files for individual locales) may
5691 be incompatible on systems where plain "char" is signed.
5693 * The configure option --disable-versioning has been removed. Builds with
5694 --disable-versioning had not worked for several years.
5696 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5697 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5699 * SystemTap probes for malloc have been introduced.
5701 * SystemTap probes for slow multiple precision fallback paths of
5702 transcendental functions have been introduced.
5704 * Support for powerpc64le has been added.
5706 * The soft-float powerpc port now supports e500 processors.
5708 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5710 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5711 set of header declarations that are enabled by default, even when other
5712 feature test macros or compiler options such as -std=c99 would otherwise
5713 disable some of those declarations.
5715 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5716 conflict with POSIX. The libbsd-compat library (which was a dummy library
5717 that did nothing) has also been removed.
5719 * Preliminary documentation about Multi-Thread, Async-Signal and
5720 Async-Cancel Safety has been added.
5722 * Change of ABI data structures for s390 and s390x:
5723 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5724 allow for future hardware extensions. All library functions that accept or
5725 return these structures were versioned in order to provide backwards
5726 compatibility with existing code. However, not all cases can be handled
5727 with interface versioning. If an application embeds either structure into
5728 another structure and that structure is passed to another compilation unit
5729 which expects the newer larger-sized object then any access to the new
5730 fields will result in undefined behaviour. Similarly any access to fields
5731 that were moved by the enlarging of the structures will cause undefined
5732 behaviour. To fix the undefined behaviour all objects that are part of the
5733 final in-memory image must agree on the size of structures, and this may
5734 require recompilation.
5738 * The following bugs are resolved with this release:
5740 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5741 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5742 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5743 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5744 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5745 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5746 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5747 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5748 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5749 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5750 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5751 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5752 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5755 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5756 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5757 Distributions can re-enable building and using pt_chown via the new configure
5758 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5759 considerable security risks and should only be used if the distribution
5760 understands and accepts the risks.
5762 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5765 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5766 fixed (Bugzilla #15330).
5768 * Add support for calling C++11 thread_local object destructors on thread
5769 and program exit. This needs compiler support for offloading C++11
5770 destructor calls to glibc.
5772 * Improved worst case performance of libm functions with double inputs and
5775 * Support for priority inherited mutexes in pthread condition variables on
5776 non-x86 architectures.
5778 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5780 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5782 * Optimized string functions for ARM. Implemented by Will Newton and
5785 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5787 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5790 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5791 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5793 * Added a benchmark framework to track performance of functions in glibc.
5795 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5796 It is based on draft TS 18661 and currently enabled as a GNU extension.
5798 * On Linux, the clock function now uses the clock_gettime system call
5799 for improved precision, rather than old times system call.
5801 * Added support for version-3 tz format files. This is needed when using
5802 the tz database release 2013e or later, and affects a few unusual cases --
5803 currently only TZ='America/Godthab' for time stamps after 2037.
5805 * Added new API functions pthread_getattr_default_np and
5806 pthread_setattr_default_np to get and set the default pthread
5807 attributes of a process.
5809 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5810 This may improve lock scaling of existing programs on TSX capable systems.
5811 When the --enable-lock-elision=yes parameter is specified at configure
5812 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5815 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5816 availability). Implemented by Ryan S. Arnold.
5818 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5822 * The following bugs are resolved with this release:
5824 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5825 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5826 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5827 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5828 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5829 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5830 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5831 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5832 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5833 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5834 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5835 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5836 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5837 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5838 14879, 14889, 14893, 14898, 14914.
5840 * Optimization of memcpy for MIPS.
5842 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5843 EMFILE has been fixed (Bugzilla #14889).
5845 * The add-on ports collection is now distributed in the "ports" subdirectory
5846 of the main GNU C Library distribution, rather than separately.
5848 * Port to ARM AArch64 contributed by Linaro.
5850 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5851 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5853 Implemented by Andreas Krebbel.
5855 * The new function secure_getenv allows secure access to the environment,
5856 returning NULL if running in a SUID/SGID process. This function replaces
5857 the internal function __secure_getenv.
5859 * SystemTap static probes have been added into the dynamic linker.
5860 Implemented by Gary Benson.
5862 * Optimizations of string functions strstr, strcasestr and memmem.
5863 Implemented by Maxim Kuvyrkov.
5865 * The minimum Linux kernel version that this version of the GNU C Library
5866 can be used with is 2.6.16.
5868 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5869 powerpc POWER7. Implemented by Will Schmidt.
5871 * New configure option --disable-nscd builds the C library such that it
5872 never attempts to contact the Name Service Caching Daemon (nscd).
5873 New configure option --disable-build-nscd avoids building nscd itself;
5874 this is the default if --disable-nscd is used.
5876 * Improved support for cross-compilation, including cross-testing and
5877 bootstrap builds without a previously built glibc.
5879 * Several testsuite tests are now able to test multiple IFUNC variants of an
5880 interface, rather than just testing the one that would be chooen by
5883 * New configure options --with-bugurl and --with-pkgversion, for
5884 distributors to use to embed their bug-reporting and package version
5885 information in --help and --version output.
5887 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5888 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5889 allows creation of chroots without the procfs mounted on /proc.
5891 * The `crypt' function now fails if passed salt bytes that violate the
5892 specification for those values. On Linux, the `crypt' function will
5893 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5894 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5895 when the mode is enabled.
5897 * The `clock_*' suite of functions (declared in <time.h>) is now available
5898 directly in the main C library. Previously it was necessary to link with
5899 -lrt to use these functions. This change has the effect that a
5900 single-threaded program that uses a function such as `clock_gettime' (and
5901 is not linked with -lrt) will no longer implicitly load the pthreads
5902 library at runtime and so will not suffer the overheads associated with
5903 multi-thread support in other code such as the C++ runtime library.
5905 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5910 * The following bugs are resolved with this release:
5912 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5913 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5914 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5915 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5916 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5917 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5918 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5919 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5920 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5921 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5922 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5923 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5924 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5925 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5926 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5927 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5928 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5929 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5930 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5931 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5932 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5933 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5936 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5937 configuring glibc with:
5938 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5939 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5940 Implemented by H.J. Lu.
5944 + define static_assert
5946 + do not declare gets
5948 + declare at_quick_exit and quick_exit also for ISO C11
5950 + aligned_alloc. NB: The code is deliberately allows the size parameter
5951 to not be a multiple of the alignment. This is a moronic requirement
5952 in the standard but it is only a requirement on the caller, not the
5955 + timespec_get added
5957 + uchar.h support added
5959 + CMPLX, CMPLXF, CMPLXL added
5961 Implemented by Ulrich Drepper.
5963 * Support for the IA-64 has been moved to ports.
5965 * Remove support for anything but ELF binary format
5967 * Checking versions of poll, ppoll added.
5968 Implemented by Ulrich Drepper.
5970 * More generic and 64-bit performance optimizations to math functions.
5971 Implemented by Ulrich Drepper.
5973 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5974 headers and functions available at compile time as they were before
5975 version 2.14. This option will be removed at some time in the future
5976 after the TI-RPC library becomes fully sufficient for the needs of
5977 existing applications.
5979 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5980 Note that glibc is not expected to work with any Linux kernel version
5983 * New header <sys/auxv.h> and function getauxval allowing easy access to
5984 the AT_* key-value pairs passed from the Linux kernel. The header also
5985 defines the HWCAP_* bits associated with the AT_HWCAP key.
5987 * New locales: mag_IN
5989 * New configure option --enable-systemtap builds SystemTap static probes
5990 into libc for setjmp and longjmp and into libpthread for various operations.
5991 So far the setjmp/longjmp probes and some of the libpthread probes are
5992 provided only for i*86 and x86_64.
5993 Implemented by Roland McGrath and Rayson Ho.
5995 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5997 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
6000 * More optimized functions for SPARC. Implemented by David S. Miller.
6002 * Improved support for cross-compilation, especially bootstrap builds
6003 without a previously built glibc.
6005 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
6006 Chris Metcalf from Tilera.
6008 * Support for the old ARM ABI has been removed from ports. Only the EABI is
6009 now supported for ARM processors.
6011 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
6012 as the name of the dynamic linker, to distinguish it from the
6013 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
6015 * Support for CRIS has been removed from ports.
6017 * A new class of installed header has been documented for low-level
6018 platform-specific functionality. PowerPC added the first instance with a
6019 function to provide time base register access. Contributed by Tulio
6020 Magno Quites Machado Filho.
6022 * ix86 configurations now install header files that are consistent with
6023 what x86-64 configurations install. These same header files can be used
6024 for -m32, -m64, or -mx32 builds.
6025 Contributed by H.J. Lu.
6027 * Math library bug fixes. A thorough audit of all open math library bugs was
6028 conducted by Joseph Myers. Significant progress was made on many math
6029 library bugs resulting in more accurate exceptions and function results.
6030 Many thanks to all those that contributed including Andreas Jaeger for his
6031 patch review and work on the x87 trigonometric instruction issues.
6033 * Timezone data is no longer installed. Timezone-related binaries and scripts
6034 will continue to be installed. Users should obtain their timezone data from
6035 their distribution provider or from the tzdata package at
6036 <ftp://munnari.oz.au/pub/>.
6040 * The following bugs are resolved with this release:
6042 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
6043 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
6044 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
6045 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
6046 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
6047 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
6048 13484, 13506, 13515, 13523, 13524, 13538, 13540
6050 * New program pldd to list loaded object of a process
6051 Implemented by Ulrich Drepper.
6053 * Add nss_db support back to glibc. No more dependency on Berkeley db
6054 and support for initgroups lookups.
6055 Implemented by Ulrich Drepper.
6057 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
6058 Contributed by HJ Lu.
6060 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
6061 Contributed by HJ Lu.
6063 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
6064 on x86-32 and x86-64.
6065 Contributed by Liubov Dmitrieva.
6067 * Optimized strchr and strrchr for SSE on x86-32.
6068 Contributed by Liubov Dmitrieva.
6070 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
6071 for x86-64 and x86-32.
6072 Contributed by Liubov Dmitrieva.
6074 * New interfaces: scandirat, scandirat64
6075 Implemented by Ulrich Drepper.
6077 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
6078 Implemented by Ulrich Drepper.
6080 * nscd now also caches the netgroup database.
6081 Implemented by Ulrich Drepper.
6083 * Integrate libm with gcc's -ffinite-math-only option.
6084 Implemented by Ulrich Drepper.
6086 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
6087 to math functions. Implemented by Ulrich Drepper.
6089 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
6090 Implemented by Ulrich Drepper.
6092 * New Linux interfaces: process_vm_readv, process_vm_writev
6094 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
6095 Implemented by Ulrich Drepper.
6097 * Optimized nearbyint and strcasecmp for PPC.
6098 Implemented by Adhemerval Zanella.
6100 * New locales: bho_IN, unm_US, es_CU, ta_LK
6104 * The following bugs are resolved with this release:
6106 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
6107 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
6108 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
6109 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
6110 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
6111 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
6112 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
6113 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
6114 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
6115 12795, 12811, 12813, 12814, 12841
6117 * The RPC implementation in libc is obsoleted. Old programs keep working
6118 but new programs cannot be linked with the routines in libc anymore.
6119 Programs in need of RPC functionality must be linked against TI-RPC.
6120 The TI-RPC implementation is IPv6 enabled and there are other benefits.
6122 Visible changes of this change include (obviously) the inability to link
6123 programs using RPC functions without referencing the TI-RPC library and the
6124 removal of the RPC headers from the glibc headers.
6125 Implemented by Ulrich Drepper.
6127 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
6128 syncfs, setns, sendmmsg
6130 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
6131 yue_HK, lij_IT, mhr_RU
6133 * New encodings: CP770, CP771, CP772, CP773, CP774
6135 * New program sotruss to trace calls through PLTs
6136 Implemented by Ulrich Drepper.
6138 * The malloc hook implementation is marked deprecated and will be removed
6139 from the default implementation in the next version. The design never
6140 worked ever since the introduction of threads. Even programs which do
6141 not create threads themselves can use multiple threads created internally.
6145 * The following bugs are resolved with this release:
6147 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
6148 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
6149 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
6150 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
6153 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
6155 * POWER7 optimizations: memset, memcmp, strncmp
6157 * New optimized string functions for x86-64: strnlen (SSE2),
6158 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
6159 Implemented by Ulrich Drepper.
6163 * The following bugs are resolved with this release:
6165 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
6166 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
6167 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
6168 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
6169 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
6170 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
6171 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
6172 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
6174 * New interfaces: pthread_getname_np, pthread_setname_np
6176 * New Linux interface: recvmmsg
6178 * STT_GNU_IFUNC implemented for Sparc by David Miller.
6180 * The dynamic linker now recognizes supported ABI versions from the
6181 EI_ABIVERSION field in the ELF header.
6182 Implemented by Ulrich Drepper.
6184 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
6185 will not be used to fill in password fields in the passwd.byname replies.
6186 Instead it is used to synthesize the shadow.byname table, should it be
6187 missing. This is a useful mode in some installations involving Solaris.
6188 Implemented by Ulrich Drepper.
6190 * New locales: kok_IN, sq_MK, cv_RU
6194 * The following bugs are resolved with this release:
6196 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
6197 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
6198 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
6199 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
6200 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
6201 10789, 10817, 10823, 10840, 10847
6203 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
6205 Implemented by Ulrich Drepper.
6207 * Checking version of longjmp added that fails if an uninitialized stack
6208 frame would be created. Implemented by Ulrich Drepper.
6210 * STT_GNU_IFUNC is now supported in static executables.
6211 Implemented by H.J. Lu.
6213 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
6215 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
6216 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
6217 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
6218 Contributed by H.J. Lu.
6220 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
6221 Implemented by Ulrich Drepper.
6223 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
6225 Contributed by H.J. Lu.
6227 * Support for fma instruction in AVX on x86-64.
6228 Implemented by H.J. Lu and Ulrich Drepper.
6230 * AVX support in x86-64 auditing support in ld.so.
6231 Implemented by H.J. Lu.
6233 * STB_GNU_UNIQUE support added.
6234 Implemented by Ulrich Drepper.
6236 * Implement second fallback mode for optimized DNS lookup for even more
6237 broken environments. If two requests from the same port are not
6238 handled correctly close the socket and open a new one before sending
6239 the second request. The 'single-request-reopen' option in /etc/resolv.conf
6240 can be used to select this mode right away, instead of rediscovering the
6241 necessity is every process again.
6242 Implemented by Ulrich Drepper.
6244 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
6245 Implemented by Adam Tkac.
6247 * Optimized iconv conversions for S390x.
6248 Implemented by Andreas Krebbel.
6250 * Using condvars with PI mutexes is now more efficient due to kernel
6251 support for requeueing to PI futexes. NPTL support added for x86-64.
6252 Implemented by Ulrich Drepper.
6254 * New locales: ps_AF, my_MM
6258 * The following bugs are resolved with this release:
6260 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
6261 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
6262 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
6263 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
6264 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
6266 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
6267 Implemented by Ulrich Drepper.
6269 * New Linux interfaces: accept4, fallocate, fallocate64.
6270 Implemented by Ulrich Drepper.
6272 * Correct declarations of string function when used in C++ code. This
6273 could lead to compile errors for invalid C++ code.
6275 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
6278 * New POSIX 2008 interface: psiginfo
6279 Implemented by Ulrich Drepper.
6281 * New ISO C++1x interfaces: quick_exit, at_quick_exit
6282 Implemented by Ulrich Drepper.
6284 * Support for selecting between multiple function definitions at runtime
6285 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
6287 * The libcrypt library can now use the hash function implementations in
6288 NSS. Implemented by Ulrich Drepper.
6290 * The malloc implementation can be compiled to be less memory efficient
6291 but higher performing in multi-threaded programs.
6292 Implemented by Ulrich Drepper.
6294 * New locales: nan_TW@latin, ks_IN
6296 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
6297 Implemented by Ulrich Drepper.
6299 * Extended printf hook support. It is possible to use user-defined types
6300 and extend existing format specifiers.
6301 Implemented by Ulrich Drepper.
6303 * Handling for group shadow files has been added.
6304 Implemented by Ulrich Drepper.
6306 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
6307 servers (the case, e.g., for some people using the built-in DNS
6308 server in ADSL modems/routers). There is a once-per-process timeout
6309 in case of a broken server. To avoid it, users can run nscd or put
6310 'options single-request' in /etc/resolv.conf.
6311 Implemented by Ulrich Drepper.
6315 * The following bugs are resolved with this release:
6317 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
6318 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
6319 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
6320 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
6321 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
6323 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
6324 up at the same time. Implemented by Ulrich Drepper.
6326 * TLS descriptors for LD and GD on x86 and x86-64.
6327 Implemented by Alexandre Oliva.
6329 * getaddrinfo now handles DCCP and UDPlite.
6330 Implemented by Ulrich Drepper.
6332 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
6333 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
6334 Implemented by Ulrich Drepper.
6336 * New implementation of memmem, strstr, and strcasestr which is O(n).
6337 Implemented by Eric Blake.
6339 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
6341 * Implement "e" option for popen to open file descriptor with the
6342 close-on-exec flag set. Implemented by Ulrich Drepper.
6344 * Implement "b" mode for fmemopen. In this mode writes writes don't
6345 implicitly add a NUL byte and seeks from the end of the buffer really
6346 use the buffer end, not the string length as the basis.
6347 Implemented by Ulrich Drepper.
6349 * Many functions, exported and internal, now atomically set the close-on-exec
6350 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
6352 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
6354 Implemented by Pravin Satpute.
6356 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
6360 * The following bugs are resolved with this release:
6362 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
6363 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
6364 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
6365 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
6366 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
6367 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
6368 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
6370 * New locales: bo_CN, bo_IN, shs_CA.
6372 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
6374 * Sorting rules for some Indian languages (Devanagari and Gujarati).
6375 Implemented by Pravin Satpute.
6377 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
6379 * nscd caches now all timeouts for DNS entries
6380 Implemented by Ulrich Drepper.
6382 * nscd is more efficient and wakes up less often.
6383 Implemented by Ulrich Drepper.
6385 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
6386 vdprintf, and obstack_vprintf.
6387 Implemented by Jakub Jelinek.
6389 * Faster memset for x86-64.
6390 Implemented by Harsha Jagasia and H.J. Lu.
6392 * Faster memcpy on x86.
6393 Implemented by Ulrich Drepper.
6395 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
6396 Implemented by Ulrich Drepper.
6398 * Faster sqrt and sqrtf implementation for some PPC variants.
6399 Implemented by Steven Munroe.
6403 * The following bugs are resolved with this release:
6405 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
6406 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
6407 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
6408 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
6409 5071, 5103, 5104, 5112, 5113, 5184, 5186
6411 * More checking functions: fread, fread_unlocked, open*, mq_open.
6412 Implemented by Jakub Jelinek and Ulrich Drepper.
6414 * Extend fortification to C++. Implemented by Jakub Jelinek.
6416 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
6417 by not recognizing 'a' as a modifier when those specs are requested.
6418 Implemented by Jakub Jelinek.
6420 * PPC optimizations to math and string functions.
6421 Implemented by Steven Munroe.
6423 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
6424 options to be passed. Implemented by Ulrich Drepper.
6426 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
6428 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
6429 Implemented by Ulrich Drepper.
6431 * Handle private futexes in the NPTL implementation.
6432 Implemented by Jakub Jelinek and Ulrich Drepper.
6434 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
6435 Implemented by Roland McGrath and Ulrich Drepper.
6437 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
6439 * SHA-256 and SHA-512 based password encryption.
6440 Implemented by Ulrich Drepper.
6442 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
6443 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
6446 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
6447 Implemented by Ulrich Drepper.
6451 * The following bugs are resolved with this release:
6453 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
6454 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
6455 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
6456 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
6457 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
6458 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
6459 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
6462 * New Linux interfaces: epoll_pwait, sched_getcpu.
6464 * New generic interfaces: strerror_l.
6466 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6470 * The following bugs are resolved with this release:
6472 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6473 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6474 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6475 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6476 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6477 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6478 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6479 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6480 3225, 3251, 3252, 3253, 3273
6482 * For Linux, the sorting of addresses returned by getaddrinfo now also
6483 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6484 Implemented by Ulrich Drepper.
6486 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6487 Implemented by Ulrich Drepper.
6489 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6491 * New iconv module for MIK. Contributed by Alexander Shopov.
6493 * For sites with broken group and/or passwd database, the auto-propagate
6494 option of nscd can prevent creating ID lookup entries from the results
6495 of a name lookup and vice versa. This usually is no problem but some
6496 site might have problems with the default behavior.
6497 Implemented by Ulrich Drepper.
6499 * Iterating over entire database in NIS can be slow. With the
6500 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6501 to trade time for memory. The entire database will be read at once.
6502 Implemented by Ulrich Drepper.
6504 * The interfaces introduced in RFC 3542 have been implemented by
6507 * Support for the new ELF hash table format was added by Ulrich Drepper.
6509 * Support for priority inheritance mutexes added by Jakub Jelinek and
6512 * Support for priority protected mutexes added by Jakub Jelinek.
6514 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6515 or_IN, csb_PL, fy_NL, sr_ME.
6519 * More overflow detection functions.
6521 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6522 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6524 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6525 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6526 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6527 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6528 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6529 by Masahide Washizawa.
6531 * It is now possible to install audit libraries for the dynamic linker using
6532 LD_AUDIT. Implemented by Ulrich Drepper.
6534 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6535 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6536 For a libc and libpthread that works well on Linux 2.4 kernels, we
6537 recommend using the stable 2.3 branch.
6539 * The new function open_wmemstream acts like open_memstream,
6540 but uses a wchar_t wide character buffer.
6542 * The new function ppoll is an improved version of poll, similar to pselect.
6544 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6545 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6546 renameat, unlinkat, linkat, symlinkat, readlinkat.
6548 * New Linux kernel system calls: unshare,
6549 inotify_init, inotify_add_watch, inotify_rm_watch.
6551 * The euidaccess function is now also known by the alias eaccess,
6552 for compatibility with some other systems.
6554 * Timezone data updated to 2006b version.
6558 * The following bugs are resolved with this release:
6560 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6561 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6562 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6563 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6564 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6565 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6567 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6569 * As of this release, GCC 4 can be used to compile the C Library.
6571 * Timezone data updated to 2005m version.
6575 * The following bugs are resolved with this release:
6577 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6578 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6579 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6580 777, 787, 821, 822, 823, 825
6582 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6586 * Support for RFC 3678. Real implementations exist only for Linux so far.
6587 Implemented by Ulrich Drepper.
6589 * nscd can now cache entries persistently. Expiring entries are reloaded.
6590 For speedups the cache can be shared in memory with client processes.
6591 Implemented by Ulrich Drepper.
6593 * nscd can now perform SELinux checks.
6594 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6596 * getaddrinfo queries are now cached. Canonical name lookup is performed
6598 Implemented by Ulrich Drepper.
6600 * The nothrow function attribute is used when headers are used by gcc when
6601 compiling C code. This can avoid significant amounts of exception
6604 * The malloc functions perform more error checking and are stricter when
6605 it comes to reacting on errors. The default action is to terminate
6606 the process after showing an error message. Implemented by Ulrich Drepper.
6608 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6609 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6611 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6612 namespaces using the new function dlmopen(). This feature is of course,
6613 like most other dynamic loading functionality, not available in statically
6614 linked applications. Implemented by Ulrich Drepper.
6616 * Low-overhead boundary checking variants of string and some stdio functions
6617 were added. These are to be used in conjunction with a gcc patch by
6618 Jakub Jelinek which adds calls to these functions if possible.
6619 Implemented by Jakub Jelinek and Ulrich Drepper.
6621 * Old code for several operating systems and machine architectures that
6622 have not been in working condition in a long time have been removed from
6623 the main source tree maintained by the GNU C Library's maintainers.
6624 These files are now reside in the separate `ports' source module
6625 that is usable as an add-on when building the library.
6629 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6630 interrogate the dynamic linker, compatible with the Solaris interface.
6632 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6633 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6635 * getifaddrs now uses the netlink interface on Linux to get its information.
6636 Implemented by Thorsten Kukuk.
6638 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6639 Implemented by Ulrich Drepper.
6641 * support for non-executable stacks on x86 has been added. Changes mostly
6644 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6647 * getaddrinfo now performs destination address selection according to
6652 * Thread-safe interfaces for many functions that access locale data
6653 were added in version 2.3, but these features were omitted from NEWS.
6654 Many functions have variants with an `_l' suffix that take a `locale_t'
6655 object as a parameter rather than consulting the current locale.
6656 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6657 create and maintain `locale_t' objects. Additionally, the new function
6658 `uselocale' sets "the current locale" (as used by functions not so
6659 parameterized) set for an individual thread. These features were added
6660 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6662 * The functions getresuid, getresgid, setresuid, and setresgid, which
6663 have long been available on Linux, are now declared in <unistd.h>
6664 and are now also available on the Hurd.
6666 * ELF thread-local storage support (TLS) now works on x86-64.
6668 * The new dynamic string token $LIB is expanded in shared library names.
6669 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6671 * Aldy Hernandez contributed complete software floating point support for
6672 PowerPC machines with no FPU.
6674 * fexecve is implemented on Linux.
6676 * The `btowc' function should work at least twice as fast due to
6677 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6679 * With appropriate thread add-ons cancelable functions are now implemented
6680 in libc.so as well. No need to call the function in libpthread. This
6681 change allowed to finally disable the incorrect and expensive handling
6682 of weak definition in ld.so.
6684 * Yet more PLT entries in libc.so have been removed. We finally arrived
6685 at the bare minimum. Startup times improved appropriately.
6687 * Support for the new Linux/x86 system call interface was added. The
6688 AT_SYSINFO auxiliary vector entry is recognized and handled.
6692 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6695 * iconv (the program and the interface) now accepts empty names (excluding
6696 options like //TRANSLIT) to mean "use charset of current locale".
6698 * localedef can now transliterate characters in strings which are not in
6699 the provided charmap. The information from the input locale is used.
6701 * Prelinking support was added for ELF targets. This requires additional
6702 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6704 * Read-only stdio streams now use mmap to speed up operation by eliminating
6705 copying and buffer underflows. To use add 'm' to the mode string of
6706 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6708 * The malloc functions were completely rewritten by Wolfram Gloger based
6709 on Doug Lea's malloc-2.7.0.c.
6711 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6712 implementation of regex.
6714 * Bruno Haible upgraded the iconv and locale implementation to support
6717 * Contents of the LC_* and LANG environment variables in the CEN style are
6718 not recognized anymore. It never was used. Change by Ulrich Drepper.
6720 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6721 thread-local storage (TLS) ABI on some platforms.
6722 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6724 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6725 EUC-JISX0213, and TSCII.
6727 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6728 BSD-compatible interface for getting all network interface addresses.
6729 Implementation for IPv4 by Roland McGrath.
6731 * Loading of locale data is faster due to the introduction of a locale
6732 archive. Implemented by Roland McGrath and Ulrich Drepper.
6734 * Startup times are significantly reduced by not using exported functions
6735 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6738 * Steven Munroe contributed a port to PowerPC64/Linux.
6742 * The Hurd now uses the GNU libio implementation of stdio rather than the
6743 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6745 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6746 with the same behavior as the Linux system call of the same name.
6750 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6751 128-bit long double format.
6753 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6754 IBM1161, and IBM1162 charsets.
6756 * Andreas Jaeger contributed a port to x86-64/Linux.
6758 * Peter Bruin contributed a port to PowerPC/Hurd.
6760 * libc functions using I/O streams now can handle wide-oriented streams
6763 * optimizations in the dynamic linker. Binaries created by recent binutils
6764 versions start up quicker due to reduced time spent on relocations.
6766 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6770 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6771 asinh, atanh, j0 for the 128-bit long double format.
6773 * Bruno Haible updated all the code handling Unicode in some form to
6774 support Unicode 3.1.
6776 * Speed of regex for single-byte locales is back to previous levels.
6777 Patch by Isamu Hasegawa.
6779 * Alpha, SPARC, and IA-64 now also using floating stacks.
6781 * Startup time of internationalized applications greatly improved through
6782 iconv cache. Use iconvconfig to generate the cache file.
6783 Contributed by Ulrich Drepper.
6785 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6786 severe performance problems. Patch by David Mosberger.
6788 * The Hurd port got a lot more functionality like AIO, various stdio
6789 extensions, etc. Mainly done by Roland McGrath.
6791 * mtrace can now lookup symbols in shared libraries.
6795 * Intel's IA-64 math library is largely integrated. It provides fast and
6796 accurate implementatations for most basic and standard math functions
6797 in float, double, and long double format.
6799 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6800 and asin for the 96-bit long double format and asin, log, tan for the
6801 128-bit long double format.
6803 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6804 The basic double functions exist today. Contributed by Abraham Ziv
6805 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6806 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6808 * An asynchronous name lookup library was added. The interface is designed
6809 after POSIX AIO. The proposal was circulated beforehand to get comments.
6810 No negative ones came in. Implemented by Ulrich Drepper.
6812 * Port to S390/64bit contributed by Martin Schwidefsky
6813 <schwidefsky@de.ibm.com>.
6815 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6816 of functions for Linux/IA-64.
6818 * The RPC code is now thread safe. Threads can now use the same service
6819 of different services at the same time. Patch by Eric Norum
6820 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6822 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6823 family of functions for Linux/S390.
6825 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6826 of functions for Linux/x86.
6828 * Port to Linux/CRIS contributed by Axis Communications.
6832 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6833 we can now check for namespace violations and missing declarations. The
6834 result is that almost all headers are now Unix-compliant (as defined in
6835 the upcoming XPG6). The negative side is that some programs might need
6836 corrections, too, if they depend on the incorrect form of the headers in
6837 previous versions which defined too many symbols and included too many
6840 * regex now handles multibyte character sets correctly.
6841 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6843 * iconv (the program) does now conform to the upcoming XPG6 and handles
6844 charmaps. Instead of the charset names the path of charmaps can be
6845 provided and the conversion happens based on this data.
6846 Contributed by Ulrich Drepper.
6848 * The locale program now provides detailed information about the installed
6853 only lists the names of the supported locales
6857 provides details such as country, language, and codeset name.
6858 Contributed by Ulrich Drepper.
6862 * The gencat program now parses the input file according to the charset
6863 selected by the LC_CTYPE category. This is important for stateful
6864 character sets. To make generating catalogs easier there is a way
6865 to overwrite the charset selected by the locale: before the first
6866 message or $ quote line the catalog can contain a line like
6868 $ codeset=ISO-8859-2
6870 to select the charset (ISO-8859-2 in this case).
6872 Implemented by Shinya Hanataka and Ulrich Drepper.
6874 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6875 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6876 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6878 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6879 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6881 * The LANGUAGE environment variable is now ignored unless the locale is
6882 changed from the default "C" locale.
6884 * The usual bug fixes.
6888 * Greg McGary added runtime support for bounds checking using gcc's
6889 new -fbounded-pointers option. ix86 target is complete. PowerPC
6892 * Thorsten Kukuk added secure mode support to nscd.
6894 * The Berkeley db libraries have been removed.
6896 Related, the nss_db module is now in a separate package since it
6897 obviously requires a database library being available.
6899 * Wide character I/O streams implemented by Ulrich Drepper.
6901 * Functions from the extended socket API added by Ulrich Drepper.
6903 * Functions feenableexcept and fedisableexcept to control the
6904 behaviour of individual exceptions have been added by Andreas Jaeger.
6906 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6908 * The resolver code has been updated from bind 8.2.3-T5B which supports
6909 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6912 This change could in some situations effect backward compatibility. Since
6913 now `_res' is a thread-local instead of a global variable, modifying it
6914 in one thread does not have any effect in other threads.
6916 The resolver library was also extended to allow IPv6 as the transport
6917 protocol for the requests. This work was done by Stig Venaas.
6919 * Compatibility code for K&R C compilers has been removed from the
6920 header files. A ISO C compiler is needed to use the library
6921 (conforming to either C89 or C99 standard).
6923 * Complete rewrite of the localedef program to support multibyte character
6924 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6925 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6926 Implemented by Ulrich Drepper.
6928 Bruno Haible significantly improved the generation and use of the data
6929 structures for the wide character tables.
6931 * Plural handling in gettext implemented by Ulrich Drepper.
6933 * The utmp daemon has been removed.
6935 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6937 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6940 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6942 * POSIX barriers implemented by Kaz Kylheku.
6944 * POSIX spawn function family implemented by Ulrich Drepper.
6946 * POSIX spinlocks are now available.
6948 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6950 * the configure option --enable-kernel=X.Y.Z allows to strip out
6951 compatibility for kernel versions before X.Y.Z. This is currently only
6952 implemented for Linux.
6954 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6955 field sin6_scope_id. This means that all programs using IPv6 should be
6956 recompiled. Don't expect binary compatibility with previous glibc
6959 * various conversion modules for IBM character sets contributed by
6962 * IA-64 port by Jes Sorensen and HJ Lu.
6976 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6978 * New xdr functions are added; some rpc functions are now 64bit clean.
6980 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6982 * Fixed known incompatibilities with glibc 2.0.
6984 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6986 * Optimized a number of functions (especially the ELF dynamic loader).
6988 * Update timezone data files.
6990 * lots of charmaps corrections
6992 * some new locale definitions and charmaps
6997 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6998 conform to POSIX member type requirements. Symbol versions have been
6999 adjusted as needed within the library, and for direct use by applications,
7000 but there is potential for problems if third-party libraries use
7001 struct timeval as part of their interface. This does not present
7002 a problem for X and other "essential" system libraries.
7004 * An additional locale model to support C++ Standard Library locale
7005 model and probably more was implemented by Ulrich Drepper.
7007 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
7010 * Miles Bader provided the `argp' function family to support hierarchical
7011 command line argument parsing, layered on top of getopt.
7013 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
7015 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
7018 * scanf recognizes the %a and %A format for scanning floating point numbers.
7020 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
7021 information and interfaces for the available integer types.
7023 * about 130 new math functions were added to implement the ISO C9x math
7026 * the new header <complex.h> contains definitions of the complex math
7027 functions from ISO C 9X.
7029 * the new header <tgmath.h> defines generic macros to use complex or
7030 real valued functions.
7032 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
7034 * Andreas Jaeger provided a test suite for the math library.
7036 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
7038 * Ulrich Drepper added character set conversion functions (iconv).
7040 * Optimized string functions have been added.
7042 * The localedata addon is now part of glibc.
7044 * An implementation of profiling shared libraries was added by Ulrich Drepper.
7046 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
7047 daemon for NSS (nscd).
7049 Missing a better place here are some numbers on improvements. Under
7050 Linux 2.1.125 un-tar-ing the kernel sources takes
7054 using local files 12.19s 6.88s 22.91s
7056 using NIS 13.92s 8.91s 26.34s
7058 using NIS & nscd 10.37s 7.34s 25.30s
7060 using NIS+ 27.57s 30.37s 640.46s
7062 using NIS+ & nscd 10.25s 7.83s 26.51s
7064 using NIS & old nscd [1] 13.83s 8.32s 29.60s
7066 Keep in mind that non-namelookup related operations dominate above times.
7067 It was just a common complain that using NIS+ unpacking the kernel is
7070 [1] The old nscd implementation is not available anymore since it was
7071 distributed with glibc up to version 2.0.98 and thus is now replaced.
7073 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
7075 * Mark Kettenis provided a Hesiod NSS module.
7077 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
7078 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
7080 * rcmd can now handle netgroups (Dick Streefland).
7082 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
7085 * Support for the IPv6 protocol has been added to the socket API, as per the
7086 latest draft standards.
7088 * Support for Linux 2.2 has been added.
7090 * Interface changes relative to the latest 2.0.x release:
7091 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7092 addseverity NEW: Unix98
7093 alphasort64 NEW: LFS
7094 argp_err_exit_status NEW: argp, GNU ext
7095 argp_error NEW: argp, GNU ext
7096 argp_failure NEW: argp, GNU ext
7097 argp_help NEW: argp, GNU ext
7098 argp_parse NEW: argp, GNU ext
7099 argp_program_bug_address NEW: argp, GNU ext
7100 argp_program_version NEW: argp, GNU ext
7101 argp_program_version_hook NEW: argp, GNU ext
7102 argp_state_help NEW: argp, GNU ext
7103 argp_usage NEW: argp, GNU ext
7104 authdes_create NEW: Secure RPC
7105 authdes_getucred NEW: Secure RPC
7106 authdes_pk_create NEW: Secure RPC
7107 backtrace NEW: GNU ext.
7108 backtrace_symbols NEW: GNU ext.
7109 backtrace_symbols_fd NEW: GNU ext.
7111 cacosf NEW: ISO C 9x
7112 cacosh NEW: ISO C 9x
7113 cacoshf NEW: ISO C 9x
7114 cacoshl NEW: ISO C 9x
7115 cacosl NEW: ISO C 9x
7122 casinf NEW: ISO C 9x
7123 casinh NEW: ISO C 9x
7124 casinhf NEW: ISO C 9x
7125 casinhl NEW: ISO C 9x
7126 casinl NEW: ISO C 9x
7128 catanf NEW: ISO C 9x
7129 catanh NEW: ISO C 9x
7130 catanhf NEW: ISO C 9x
7131 catanhl NEW: ISO C 9x
7132 catanl NEW: ISO C 9x
7133 cbc_crypt NEW: Secure RPC
7137 ccoshf NEW: ISO C 9x
7138 ccoshl NEW: ISO C 9x
7144 cimagf NEW: ISO C 9x
7145 cimagl NEW: ISO C 9x
7146 clearerr_locked REMOVED
7147 clntunix_create NEW: sunrpc ext
7149 clog10 NEW: ISO C 9x
7150 clog10f NEW: ISO C 9x
7151 clog10l NEW: ISO C 9x
7161 cprojf NEW: ISO C 9x
7162 cprojl NEW: ISO C 9x
7164 crealf NEW: ISO C 9x
7165 creall NEW: ISO C 9x
7170 csinhf NEW: ISO C 9x
7171 csinhl NEW: ISO C 9x
7174 csqrtf NEW: ISO C 9x
7175 csqrtl NEW: ISO C 9x
7179 ctanhf NEW: ISO C 9x
7180 ctanhl NEW: ISO C 9x
7182 des_setparity NEW: Secure RPC
7183 ecb_crypt NEW: Secure RPC
7184 endutxent NEW: Unix98
7186 exp10f NEW: ISO C 9x
7187 exp10l NEW: ISO C 9x
7191 fattach NEW: STREAMS
7192 fdetach NEW: STREAMS
7196 feclearexcept NEW: ISO C 9x
7197 fegetenv NEW: ISO C 9x
7198 fegetexceptflag NEW: ISO C 9x
7199 fegetround NEW: ISO C 9x
7200 feholdexcept NEW: ISO C 9x
7202 feraiseexcept NEW: ISO C 9x
7203 ferror_locked REMOVED
7204 fesetenv NEW: ISO C 9x
7205 fesetexceptflag NEW: ISO C 9x
7206 fesetround NEW: ISO C 9x
7207 fetestexcept NEW: ISO C 9x
7208 feupdateenv NEW: ISO C 9x
7209 fflush_locked REMOVED
7213 fgets_unlocked NEW: GNU ext.
7214 fileno_locked REMOVED
7226 fputc_locked REMOVED
7227 fputs_unlocked NEW: GNU ext.
7228 fread_unlocked NEW: GNU ext.
7233 fstatvfs NEW: Unix98
7237 ftruncate64 NEW: LFS
7239 fwrite_unlocked NEW: GNU ext.
7240 gai_strerror NEW: IPv6
7244 getchar_locked REMOVED
7246 getdate_err NEW: Unix98
7247 getdate_r NEW: GNU ext.
7249 getnameinfo NEW: IPv6
7250 getnetname NEW: Secure RPC
7251 getpmsg NEW: STREAMS
7252 getpt NEW: Unix98 PTY
7253 getrlimit64 NEW: LFS
7254 getutxent NEW: Unix98
7255 getutxid NEW: Unix98
7256 getutxline NEW: Unix98
7257 glob64 NEW: GNU ext.
7258 globfree64 NEW: GNU ext.
7259 gnu_get_libc_release NEW: GNU ext.
7260 gnu_get_libc_version NEW: GNU ext.
7261 grantpt NEW: Unix98 PTY
7262 host2netname NEW: Secure RPC
7264 iconv_close NEW: iconv
7265 iconv_open NEW: iconv
7266 if_freenameindex NEW: IPv6
7267 if_indextoname NEW: IPv6
7268 if_nameindex NEW: IPv6
7269 if_nametoindex NEW: IPv6
7270 in6addr_any NEW: IPv6
7271 in6addr_loopback NEW: IPv6
7272 inet6_isipv4mapped NEW: IPv6
7273 isastream NEW: STREAMS
7274 iswblank NEW: GNU ext.
7275 key_decryptsession NEW: Secure RPC
7276 key_decryptsession_pk NEW: Secure RPC
7277 key_encryptsession NEW: Secure RPC
7278 key_encryptsession_pk NEW: Secure RPC
7279 key_gendes NEW: Secure RPC
7280 key_get_conv NEW: Secure RPC
7281 key_secretkey_is_set NEW: Secure RPC
7282 key_setnet NEW: Secure RPC
7283 key_setsecret NEW: Secure RPC
7284 llrint NEW: ISO C 9x
7285 llrintf NEW: ISO C 9x
7286 llrintl NEW: ISO C 9x
7287 llround NEW: ISO C 9x
7288 llroundf NEW: ISO C 9x
7289 llroundl NEW: ISO C 9x
7294 lrintf NEW: ISO C 9x
7295 lrintl NEW: ISO C 9x
7296 lround NEW: ISO C 9x
7297 lroundf NEW: ISO C 9x
7298 lroundl NEW: ISO C 9x
7300 makecontext NEW: Unix98
7301 mempcpy NEW: GNU ext.
7304 modify_ldt NEW: kernel
7308 nearbyint NEW: ISO C 9x
7309 nearbyintf NEW: ISO C 9x
7310 nearbyintl NEW: ISO C 9x
7311 netname2host NEW: Secure RPC
7312 netname2user NEW: Secure RPC
7313 nexttoward NEW: ISO C 9x
7314 nexttowardf NEW: ISO C 9x
7315 nexttowardl NEW: ISO C 9x
7319 passwd2des NEW: Secure RPC
7321 pow10f NEW: GNU ext.
7322 pow10l NEW: GNU ext.
7325 printf_size NEW: GNU ext.
7326 printf_size_info NEW: GNU ext.
7327 profil_counter REMOVED
7328 pthread_mutexattr_getkind_np REPLACED
7329 pthread_mutexattr_setkind_np REPLACED
7330 ptsname NEW: Unix98 PTY
7331 ptsname_r NEW: Unix98 PTY
7333 putchar_locked REMOVED
7334 putgrent NEW: GNU ext.
7336 putpmsg NEW: STREAMS
7337 pututxline NEW: Unix98
7341 readdir64_r NEW: LFS
7342 remquo NEW: ISO C 9x
7343 remquof NEW: ISO C 9x
7344 remquol NEW: ISO C 9x
7346 roundf NEW: ISO C 9x
7347 roundl NEW: ISO C 9x
7349 scalbln NEW: ISO C 9x
7350 scalblnf NEW: ISO C 9x
7351 scalblnl NEW: ISO C 9x
7353 sendfile NEW: kernel
7354 setcontext NEW: Unix98
7355 setrlimit64 NEW: LFS
7356 setutxent NEW: Unix98
7358 sigignore NEW: Unix98
7359 sigqueue NEW: POSIX.1b
7360 sigrelse NEW: Unix98
7361 sigset NEW: POSIX.1b
7362 sigtimedwait NEW: POSIX.1b
7363 sigwaitinfo NEW: POSIX.1b
7364 sincos NEW: GNU ext.
7365 sincosf NEW: GNU ext.
7366 sincosl NEW: GNU ext.
7370 strcasestr NEW: GNU ext.
7371 strtoimax NEW: ISO C 9x
7372 strtoumax NEW: ISO C 9x
7373 strverscmp NEW: GNU ext.
7374 svcauthdes_stats NEW: Secure RPC
7375 svcunix_create NEW: sunrpc etx
7376 svcunixfd_create NEW: sunrpc ext
7377 swapcontext NEW: Unix98
7378 tcgetsid NEW: Unix98 PTY
7379 tdestroy NEW: GNU ext.
7380 tgamma NEW: ISO C 9x
7381 tgammaf NEW: ISO C 9x
7382 tgammal NEW: ISO C 9x
7386 truncf NEW: ISO C 9x
7387 truncl NEW: ISO C 9x
7389 unlockpt NEW: Unix98 PTY
7390 updwtmpx NEW: Unix98
7391 user2netname NEW: Secure RPC
7392 utmpxname NEW: Unix98
7393 versionsort NEW: GNU ext.
7394 versionsort64 NEW: GNU ext.
7396 wcscasecmp NEW: GNU ext.
7397 wcsncasecmp NEW: GNU ext.
7398 wcsnlen NEW: GNU ext.
7399 wcstoimax NEW: ISO C 9x
7400 wcstoll NEW: ISO C 9x
7401 wcstoull NEW: ISO C 9x
7402 wcstoumax NEW: ISO C 9x
7404 wordexp NEW: POSIX.2
7405 wordfree NEW: POSIX.2
7406 write_profiling REMOVED
7407 xdecrypt NEW: Secure RPC
7408 xdr_authdes_cred NEW: Secure RPC
7409 xdr_authdes_verf NEW: Secure RPC
7410 xdr_cryptkeyarg NEW: Secure RPC
7411 xdr_cryptkeyarg2 NEW: Secure RPC
7412 xdr_cryptkeyres NEW: Secure RPC
7413 xdr_getcredres NEW: Secure RPC
7414 xdr_key_netstarg NEW: Secure RPC
7415 xdr_key_netstres NEW: Secure RPC
7416 xdr_keybuf NEW: Secure RPC
7417 xdr_keystatus NEW: Secure RPC
7418 xdr_netnamestr NEW: Secure RPC
7419 xdr_sizeof NEW: Secure RPC
7420 xdr_unixcred NEW: sunrpc ext
7421 xencrypt NEW: Secure RPC
7422 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7433 * inet_ntoa is thread-safe
7435 * updwtmp is moved from libutil to libc
7437 * rewrite of cbrt function
7439 * update of timezone data
7453 * add atoll function
7455 * fix complex problems in Berkeley DB code
7457 * fix math functions
7461 * fixed lots of header problems (especially Linux/GNU specific)
7463 * dynamic loader preserves all registers
7465 * Roland McGrath provided support for handling of auxiliary objects in
7466 the ELF dynamic loader.
7468 * support for parallel builds is improved
7472 * GNU extensions are no longer declared by default. To enable them you
7473 must define the macro `_GNU_SOURCE' in your program or compile with
7476 * The library has changed from using GNU ld symbol aliases to using weak
7477 symbols where available. The ELF object file format supports weak
7478 symbols; GNU ld also supports weak symbols in the a.out format. (There
7479 is also now support for other GNU ld extensions in ELF. Use the
7480 `--with-elf' option to configure to indicate you have ELF, and
7481 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7482 of many files which contained only symbol aliases, reducing the size of
7483 the source and the compiled library; many other files were renamed to
7484 less cryptic names previously occupied by the symbol alias files.
7485 There is a new header file <elf.h> for programs which operate on
7486 files in the ELF format.
7488 * Converted to Autoconf version 2, so `configure' has more options.
7489 Run `configure --help' to see the details.
7491 * The library can now be configured to build profiling, highly-optimized
7492 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7493 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7494 `configure' enable building these extra libraries. The shared library is
7495 built by default when using both ELF and GNU ld. When shared libraries
7496 are enabled, the new library `-ldl' is available for arbitrary run-time
7497 loading of shared objects; its interface is defined in <dlfcn.h>. The
7498 new header file <link.h> gives access to the internals of the run-time
7499 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7500 application of same name on other systems and it provides information
7501 about dynamically linked binaries.
7503 * The C library now provides the run-time support code for profiling
7504 executables compiled with `-pg'. Programs can control the profiling code
7505 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7506 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7507 the support for this file format was contributed by David Mosberger-Tang.
7509 * The math code has been replaced with a math library based on fdlibm from
7510 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7511 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7512 functions. The math functions now reside in a separate library, so
7513 programs using them will need to use `-lm' their linking commands.
7515 * John C. Bowman contributed optimized ix87 assembler inline functions.
7517 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7518 mechanism similar to that found in Solaris 2. This is now used for the
7519 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7520 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7521 file controls what services are used for each individual database. This
7522 works by loading shared libraries with names specified in `nsswitch.conf',
7523 so service modules can be changed or added at any time without even
7524 relinking any program. Currently there are the file, db, and NIS based
7525 NSS services available.
7527 * The new functions `strtoq' and `strtouq' parse integer values from
7528 strings, like `strtol' and `strtoul', but they return `long long int' and
7529 `unsigned long long int' values, respectively (64-bit quantities).
7531 * The new functions `strtof' and `strtold' parse floating-point values from
7532 strings, like `strtod', but they return `float' and `long double' values,
7533 respectively (on some machines `double' and `long double' are the same).
7535 * Ulrich Drepper has contributed new implementations of the floating-point
7536 printing and reading code used in the `printf' family of functions and
7537 `strtod', `strtof', and `strtold'. These new functions are perfectly
7538 accurate, and much faster than the old ones.
7540 * The implementation of the POSIX locale model was completely rewritten by
7541 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7542 to compile the POSIX locale definition.
7544 * The former dummy implementations of the strcoll and strxfrm function are
7545 now replaced by fully functional code contributed by Ulrich Drepper. The
7546 collation information comes from the POSIX locale definitions.
7548 * The new header <langinfo.h> defines an interface for accessing
7549 various locale-dependent data (using the locale chosen with `setlocale').
7551 * Ulrich Drepper has contributed a new suite of functions for operation on
7552 wide-character and multibyte-character strings, in <wchar.h>;
7553 and classification and case conversion of wide characters, in <wctype.h>.
7554 These new functions are conforming to the ISO C, Amendment 1 specification.
7556 * There is now a second implementation of the standard I/O library available.
7557 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7558 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7560 * You can now use positional parameter specifications in format strings
7561 for the `printf' and `scanf' families of functions. For example,
7562 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7563 ``Number 6, Mr Jones''. This is mainly useful when providing different
7564 format strings for different languages, whose grammars may dictate
7565 different orderings of the values being printed. To support this
7566 feature, the interface for `register_printf_handler' has changed; see
7567 the header file <printf.h> for details.
7569 * The `printf' and `scanf' families of functions now understand a new
7570 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7571 to group numbers as indicated by the locale; for `scanf' and friends, this
7572 says to accept as valid only a number with all the proper grouping
7573 separators in the right places. In the default "C" locale, numbers are
7574 not grouped; but locales for specific countries will define the usual
7575 conventions (i.e. separate thousands with `,' in the US locale).
7577 * The pgrp functions have been regularized, slightly incompatibly but much
7578 less confusingly. The core functions are now `getpgid' and `setpgid',
7579 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7580 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7581 provided for compatibility. There is no longer an incompatible `getpgrp'
7582 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7584 * The new header file <fts.h> and suite of functions simplify programs that
7585 operate on directory trees. This code comes from 4.4 BSD.
7587 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7588 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7589 NSS scheme used in glibc.
7591 * There is a new malloc debugging hook `__memalign_hook'.
7593 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7594 `unsigned int' in <sys/types.h>. These are for compatibility only and
7595 their use is discouraged.
7597 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7598 done differently, so that it works even without GNU ld.
7600 * New function `euidaccess' checks allowed access to a file like `access',
7601 but using the effective IDs instead of the real IDs.
7603 * The time zone data files have been updated for the latest and greatest
7604 local time conventions of the countries of the world.
7606 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7609 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7610 for formatting floating-point numbers. They are provided only for
7611 compatibility; new programs should use `sprintf' instead. There are
7612 also equivalent function for the `long double' floating-point type and
7613 all functions also exist in a reentrant form.
7615 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7616 functions for maintaining the login-record files (primarily of use to
7617 system programs such as `login'), and convenient functions for
7618 allocating and initializing a pseudo-terminal (pty) device.
7620 * Ulrich Drepper has contributed new support for System V style
7621 shared memory and IPC on systems that support it.
7623 * Ulrich Drepper has contributed several miscellaneous new functions found
7624 in System V: The `hsearch' family of functions provide an effective
7625 implementation of hash tables; `a64l' and `l64a' provide a very simple
7626 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7629 * Ulrich Drepper has contributed new reentrant counterparts for the
7630 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7632 * Ulrich Drepper has contributed new, highly-optimized versions of several
7633 string functions for the i486/Pentium family of processors.
7635 * Ulrich Drepper has updated the Linux-specific code, based largely
7636 on work done in Hongjiu Lu's version of GNU libc for Linux.
7637 The GNU library now supports Linux versions 2.0.10 and later,
7638 using the ELF object file format (i[3456]86-*-linux).
7640 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7642 * David Mosberger-Tang and Richard Henderson have ported the C library
7643 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7644 dynamic linking support for ELF/Alpha.
7646 * Richard Henderson contributed several Alpha optimized assembler function
7647 for arithmetic and string handling.
7649 * Ulrich Drepper has contributed a new set of message catalog functions to
7650 support multiple languages using the <libintl.h> interface, for use with
7651 his new package GNU gettext. Translation volunteers have contributed
7652 catalogs of the library's messages in Spanish, German, and Korean.
7654 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7655 program and the `catgets' function for reading the catalog files it
7656 creates. (The <libintl.h> interface is preferred; we include the
7657 <nl_types.h> interface using `catgets' only for source compatibility with
7658 programs already written to use it.)
7660 * New header file <values.h> gives SVID-compatible names for <limits.h>
7663 * Various new macros, declarations, and small header files for compatibility
7666 * New function `group_member' is a convenient way to check if a process has
7667 a given effective group ID.
7669 * When using GCC 2.7 and later, the socket functions are now declared in a
7670 special way so that passing an argument of type `struct sockaddr_in *',
7671 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7672 `struct sockaddr *' type, does not generate a type-clash warning.
7674 * New function `error' declared in header file <error.h> is a convenient
7675 function for printing error messages and optionally exiting; this is the
7676 canonical function used in GNU programs. The new functions `err', `warn',
7677 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7678 doing the same thing.
7680 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7681 POSIX.2 `glob' function to do ~ and {...} expansion.
7683 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7684 `clearenv' which is used in POSIX.9 is also available.
7686 * New function `getsid' returns session ID number on systems that support it.
7688 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7689 files <db.h> and <mpool.h> provide a rich set of functions for several
7690 types of simple databases stored in memory and in files, and <ndbm.h> is
7691 an old `ndbm'-compatible interface using the `db' functions. Link with
7692 `-ldb' to get these functions.
7694 * New macro `strdupa' copies a string like `strdup', but uses local stack
7695 space from `alloca' instead of dynamic heap space from `malloc'.
7697 * New function `strnlen' is like `strlen' but searches only a given maximum
7698 number of characters for the null terminator. `stpncpy', `strndup' and
7699 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7702 * New function `statfs' in header <sys/statfs.h>.
7704 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7705 provide convenient functions for operating on blocks of null-terminated
7708 * A new suite of functions in <utmp.h> handle all the details of reading
7709 and writing the utmp file.
7711 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7714 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7715 completely POSIX compliant and also implemented the extended functionality
7716 to handle alternate digit representation and alternate era date formats.
7718 * Ulrich Drepper provided an implementation of the `strptime' function
7719 defined in XPG4.2 which transforms a string into a `struct tm' value.
7721 * Paul Eggert provided the tzselect shell script as part of the timezone
7722 code. The shell script makes it easy to select the correct timezone
7725 * The implementation of the malloc family of functions is completely replaced
7726 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7727 The implementation uses the mmap function (if available) and it is
7728 optimized for the use in multi threaded programs.
7730 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7731 functions. This new functionality is usable by specifying a special
7732 salt string and it is compatible with implementation on *BSD systems.
7734 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7735 `getsubopt' to handle second level command line options, `bsd_signal'
7736 to access BSD style `signal' functionality, the obsolete `regexp' style
7739 * the `lchown' function is available on system which support this
7742 * The implementation of the shadow password handling function was contributed
7745 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7747 * POSIX.1g support was added. The <sys/select.h> header is available,
7748 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7749 implementation of `getaddrinfo'.
7753 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7755 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7756 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7758 * The new function `daemon' from 4.4 BSD is useful for server programs that
7759 want to put themselves in the background.
7761 * Joel Sherrill has contributed support for several standalone boards that
7762 run without an operating system.
7764 * `printf', `scanf' and friends now accept a `q' type modifier for long
7765 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7767 * All of the code taken from BSD (notably most of the math and networking
7768 routines) has been updated from the BSD 4.4-Lite release.
7770 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7772 * The new functions `getdomainname' and `setdomainname' fetch or change the
7773 YP/NIS domain name. These are system calls which exist on systems which
7776 * The time zone data files have been updated for the latest international
7779 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7780 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7784 * The C library now includes support for Sun RPC, from Sun's free
7785 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7786 are included. (There is still no support for YP.)
7788 * Tom Quinn has contributed a port of the C library to SGI machines running
7789 Irix 4 (mips-sgi-irix4).
7791 * The new `lockf' function is a simplified interface to the locking
7792 facilities of `fcntl', included for compatibility.
7794 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7796 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7798 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7801 * The error message printed by `assert' for a failed assertion now includes
7802 the name of the program (if using GNU ld) and the name of the calling
7803 function (with versions of GCC that support this).
7805 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7807 * The library now includes the <sys/mman.h> header file and memory
7808 management functions `mmap', `munmap', `mprotect', `msync', and
7809 `madvise', on systems that support those facilities.
7811 * The interface for `mcheck' has changed slightly: the function called to
7812 abort the program when an allocation inconsistency is detected now takes
7813 an argument that indicates the type of failure. The new function
7814 `mprobe' lets you request a consistency check for a particular block at
7815 any time (checks are normally done only when you call `free' or `realloc'
7818 * It is now possible to easily cross-compile the C library, building on one
7819 system a library to run on another machine and/or operating system. All
7820 you need to do is set the variable `HOST_CC' in `configparms' to the
7821 native compiler for programs to run on the machine you are building on (a
7822 few generator programs are used on Unix systems); set `CC' to the
7825 * The new function `fexecve' (only implemented on the GNU system) executes
7826 a program file given a file descriptor already open on the file.
7830 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7831 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7833 * You can set the variable `libprefix' in `configparms' to specify a prefix
7834 to be prepended to installed library files; this makes it easy to install
7835 the GNU C library to be linked as `-lgnuc' or whatever.
7837 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7838 copies a limited number of characters from a string, and returns the
7839 address of the last character written.
7841 * You no longer need to check for whether the installed `stddef.h' is
7842 compatible with the GNU C library. configure now checks for you.
7844 * You can now define a per-stream `fileno' function to convert the
7845 stream's cookie into an integral file descriptor.
7847 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7848 allocates zero bytes of storage, and returns a unique pointer which
7849 you can pass to `realloc' or `free'. The behavior is undefined if
7850 you dereference this pointer.
7852 * The C library now runs on Sony NEWS m68k machines running either
7853 NewsOS 3 or NewsOS 4.
7855 * The new `syscall' function is a system-dependent primitive function
7856 for invoking system calls. It has the canonical behavior on Unix
7857 systems, including unreliable return values for some calls (such as
7858 `pipe', `fork' and `getppid').
7860 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7861 to `EAGAIN', which is the preferred name. On systems whose kernels
7862 use two distinct codes, the C library now translates EWOULDBLOCK to
7863 EAGAIN in every system call function.
7867 * The GNU C Library Reference Manual is now distributed with the library.
7868 `make dvi' will produce a DVI file of the printed manual.
7869 `make info' will produce Info files that you can read on line using C-h i
7870 in Emacs or the `info' program.
7871 Please send comments on the manual to bug-glibc-manual@gnu.org.
7873 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7875 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7877 * Jason Merrill has contributed a port to the Sequent Symmetry running
7878 Dynix version 3 (i386-sequent-dynix).
7880 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7881 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7883 * New function `memory_warnings' lets you arrange to get warnings when
7884 malloc is running out of memory to allocate, like Emacs gives you.
7886 * The C library now contains the relocating allocator used in Emacs 19 for
7887 its editing buffers. This allocator (ralloc) minimizes allocation
7888 overhead and fragmentation by moving allocated regions around whenever it
7889 needs to. You always refer to a ralloc'd region with a "handle" (a
7890 pointer to a pointer--an object of type `void **').
7892 * There is a new `printf' format: `%m' gives you the string corresponding
7893 to the error code in `errno'.
7895 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7896 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7897 pass, the `a' modifier says to fill in a `char **' you pass with a
7900 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7901 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7902 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7904 * `mkstemp' is a traditional Unix function to atomically create and open a
7905 uniquely-named temporary file.
7909 * The standard location for the file that says what the local timezone is
7910 has changed again. It is now `/usr/local/etc/localtime' (or more
7911 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7913 * The distribution no longer contains any files with names longer than 14
7916 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7917 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7919 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7923 * The configuration process has changed quite a bit. The `configure'
7924 script is now used just like the configuration scripts for other GNU
7925 packages. The `sysdeps' directory hierarchy is much rearranged.
7926 The file `INSTALL' explains the new scheme in detail.
7928 * The header files no longer need to be processed into ANSI C and
7929 traditional C versions. There is just one set of files to install, and
7930 it will work with ANSI or old C compilers (including `gcc -traditional').
7932 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7933 MIPS DECStation running Ultrix 4.
7935 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7936 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7937 made itself into a shared library.
7939 * Yet further improved support for the i386, running 4.3 BSD-like systems
7940 (such as Mach 3 with the Unix single-server), or System V.
7942 * New function `strncasecmp' to do case-insensitive string comparison
7943 with limited length.
7945 * New function `strsep' is a reentrant alternative to `strtok'.
7947 * New functions `scandir' and `alphasort' for searching directories.
7949 * New function `setenv' is a better interface to `putenv'.
7951 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7952 function for traversing a directory tree.
7954 * The GNU obstack package is now also part of the C library.
7955 The new function `open_obstack_stream' creates a stdio stream that
7956 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7957 formatted output directly to an obstack.
7959 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7960 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7962 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7964 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7965 things to your strings.
7967 * There are some new test programs: test-fseek, testmb, and testrand.
7969 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7970 These ports are not finished, but are a good starting place for really
7971 supporting those systems.
7973 * `/etc/localtime' is now the standard location for the file that says what
7974 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7975 This follows the general principle that `/etc' is the place for all local
7976 configuration files.
7978 * The C library header files now use `extern "C"' when used by the C++
7979 compiler, so the C library should now work with C++ code.
7981 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7982 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7985 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7986 function which uses the `merge sort' algorithm, and is said to be
7987 significantly faster than the old GNU `qsort' function. Merge sort is
7988 now the standard `qsort' function. The new algorithm can require a lot
7989 of temporary storage; so, the old sorting function is called when the
7990 required storage is not available.
7992 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7993 provides the Unix `crypt' function, plus some other entry points.
7995 * The code and header files taken from 4.4 BSD have been updated with the
7996 latest files released from Berkeley.
7998 ----------------------------------------------------------------------
8001 Permission is granted to anyone to make or distribute verbatim copies
8002 of this document as received, in any medium, provided that the
8003 copyright notice and this permission notice are preserved,
8004 thus giving the recipient permission to redistribute in turn.
8006 Permission is granted to distribute modified versions
8007 of this document, or of portions of it,
8008 under the above conditions, provided also that they
8009 carry prominent notices stating who last changed them.
8012 version-control: never