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 * The <stdbit.h> header type-generic macros have been changed when using
13 GCC 14.1 or later to use __builtin_stdc_bit_ceil etc. built-in functions
14 in order to support unsigned __int128 and/or unsigned _BitInt(N) operands
15 with arbitrary precisions when supported by the target.
17 * The GNU C Library now supports a feature test macro _ISOC23_SOURCE to
18 enable features from the ISO C23 standard. Only some features from
19 this standard are supported by the GNU C Library. The older name
20 _ISOC2X_SOURCE is still supported. Features from C23 are also enabled
21 by _GNU_SOURCE, or by compiling with the GCC options -std=c23,
22 -std=gnu23, -std=c2x or -std=gnu2x.
24 * A new tunable, glibc.rtld.enable_secure, used to run a program
25 as if it were a setuid process. This is currently a testing tool to allow
26 more extensive verification tests for AT_SECURE programs and not meant to
27 be a security feature.
29 Deprecated and removed features, and other changes affecting compatibility:
31 * Architectures which use a 32-bit seconds-since-epoch field in struct
32 lastlog, struct utmp, struct utmpx (such as i386, powerpc64le, rv32,
33 rv64, x86-64) switched from a signed to an unsigned type for that
34 field. This allows these fields to store timestamps beyond the year
35 2038, until the year 2106. Please note that applications are still
36 expected to migrate off the interfaces declared in <utmp.h> and
37 <utmpx.h> (except for login_tty) due to locking and session management
40 Changes to build and runtime requirements:
42 [Add changes to build and runtime requirements here]
44 Security related changes:
46 The following CVEs were fixed in this release, details of which can be
47 found in the advisories directory of the release tarball:
49 [The release manager will add the list generated by
50 scripts/process-advisories.sh just before the release.]
52 The following bugs are resolved with this release:
54 [The release manager will add the list generated by
55 scripts/list-fixed-bugs.py just before the release.]
61 * A new tunable, glibc.cpu.plt_rewrite, can be used to enable PLT
62 rewrite on x86-64. When enabled with non-lazy binding, the dynamic
63 linker will rewrite indirect branches in PLT with direct branches.
65 * Sync with Linux kernel 6.6 shadow stack interface. The --enable-cet
66 configure option is only supported on x86-64.
68 * struct statvfs now has an f_type member, equal to the f_type statfs member;
69 on the Hurd this was always available under a reserved name,
70 and under Linux a spare has been allocated: it was always zero
71 in previous versions of glibc, and zero is not a valid result.
73 * On Linux, the functions posix_spawnattr_getcgroup_np and
74 posix_spawnattr_setcgroup_np have been added, along with the
75 POSIX_SPAWN_SETCGROUP flag. They allow posix_spawn and posix_spawnp
76 to set the cgroupv2 in the new process in a race-free manner. These
77 functions are GNU extensions and require a kernel with clone3 support.
79 * On Linux, the pidfd_spawn and pidfd_spawp functions have been added.
80 They have a similar prototype and semantic as posix_spawn, but instead of
81 returning a process ID, they return a file descriptor that can be used
82 along other pidfd functions (like pidfd_send_signal, poll, or waitid).
83 The pidfd functionality avoids the issue of PID reuse with the traditional
84 posix_spawn interface.
86 * On Linux, the pidfd_getpid function has been added. It allows retrieving
87 the process ID associated with the process file descriptor created by
88 pid_spawn, fork_np, or pidfd_open.
90 * scanf-family functions now support the wN format length modifiers for
91 arguments pointing to types intN_t, int_leastN_t, uintN_t or
92 uint_leastN_t (for example, %w32d to read int32_t or int_least32_t in
93 decimal, or %w32x to read uint32_t or uint_least32_t in hexadecimal)
94 and the wfN format length modifiers for arguments pointing to types
95 int_fastN_t or uint_fastN_t, as specified in draft ISO C2X.
97 * A new tunable, glibc.mem.decorate_maps, can be used to add additional
98 information on underlying memory allocated by the glibc (for instance,
99 on thread stack created by pthread_create or memory allocated by
102 * The <stdbit.h> header has been added from ISO C2X, with
103 stdc_leading_zeros, stdc_leading_ones, stdc_trailing_zeros,
104 stdc_trailing_ones, stdc_first_leading_zero, stdc_first_leading_one,
105 stdc_first_trailing_zero, stdc_first_trailing_one, stdc_count_zeros,
106 stdc_count_ones, stdc_has_single_bit, stdc_bit_width, stdc_bit_floor
107 and stdc_bit_ceil function families, each having functions for
108 unsigned char, unsigned short, unsigned int, unsigned long int and
109 unsigned long long int, and a type-generic macro.
111 * On AArch64 new symbols were added to libmvec and now math.h has
112 annotations to allow GCC 9 or newer to auto-vectorize calls to the
113 following scalar math functions when -ffast-math is specified:
114 acos, acosf, asin, asinf, atan, atanf, atan2, atan2f, cos, cosf,
115 exp, expf, exp10, exp10f, exp2, exp2f, expm1, expm1f, log, logf,
116 log10, log10f, log1p, log1pf, log2, log2f, sin, sinf, tan, tanf.
118 Deprecated and removed features, and other changes affecting compatibility:
120 * The ldconfig program now skips file names containing ';' or ending in
121 ".dpkg.tmp" or ".dpkg.new", to avoid examining temporary files created
122 by the RPM and dpkg package managers.
124 * libcrypt has been removed from the GNU C Library. The configure
125 options "--enable-crypt" and "--enable-nss-crypt" are no longer
126 available. <crypt.h>, libcrypt.a, and libcrypt.so.1 will not be
127 installed. For now <unistd.h> continues to declare the crypt
128 function by default, to avoid introducing vulnerabilities into
129 existing applications due to a missing prototype. This declaration
130 is deprecated and may be removed in a future glibc release.
132 The replacement for libcrypt is libxcrypt, maintained separately from
133 GNU libc, but available under compatible licensing terms, and providing
134 binary backward compatibility with the former libcrypt. It is currently
135 distributed from <https://github.com/besser82/libxcrypt/>.
137 As a consequence of this removal, GNU libc no longer makes any use of
138 the NSS cryptography library (Network Security Services; not to be
139 confused with Name Service Switch). Distributors of binary packages
140 of GNU libc are advised to check whether their build processes can be
143 * The dynamic linker calls the malloc and free functions in more cases
144 during TLS access if a shared object with dynamic TLS is loaded and
145 unloaded. This can result in an infinite recursion if a malloc
146 replacement library or its dependencies use dynamic TLS instead of
149 * The ia64*-*-linux-gnu configurations are no longer supported.
151 Changes to build and runtime requirements:
153 * Building on LoongArch requires at a minimum binutils 2.41 for vector
156 Security related changes:
158 The following CVEs were fixed in this release, details of which can be
159 found in the advisories directory of the release tarball:
162 getaddrinfo: Stack read overflow in no-aaaa mode (CVE-2023-4527)
165 getaddrinfo: Potential use-after-free (CVE-2023-4806)
168 tunables: local privilege escalation through buffer overflow
172 syslog: Heap buffer overflow in __vsyslog_internal (CVE-2023-6246)
175 syslog: Heap buffer overflow in __vsyslog_internal (CVE-2023-6779)
178 syslog: Integer overflow in __vsyslog_internal (CVE-2023-6780)
181 ISO-2022-CN-EXT: fix out-of-bound writes when writing escape
182 sequence (CVE-2024-2961)
185 nscd: Stack-based buffer overflow in netgroup cache (CVE-2024-33599)
188 nscd: Null pointer crashes after notfound response
192 nscd: netgroup cache may terminate daemon on memory allocation
193 failure (CVE-2024-33601)
196 nscd: netgroup cache assumes NSS callback uses in-buffer strings
199 The following bugs are resolved with this release:
201 [14522] localedata: fy_DE: LC_IDENTIFICATION data looks weird
202 [19305] libc: qsort() should return early if (nmemb <= 1)
203 [19479] localedata: gbm_IN: new Garhwali Locale
204 [19924] dynamic-link: TLS performance degradation after dlopen
205 [19956] localedata: ssy_ER: rename from aa_ER@saaho
206 [21719] libc: stdlib/msort : optimizing merge sort
207 [22526] localedata: th_TH LC_COLLATE does not use copy "iso14651_t1"
208 [23012] localedata: el_GR: Greece now uses the 24h format for time
209 [23172] localedata: miq_NI: Provide actually abbreviated month names
210 [24006] localedata: Cyclic dependencies via copy in locales
211 [24013] localedata: am_pm definitions for es_ES
212 [24386] localedata: crh_RU: new locale
213 [24877] localedata: [Redundant Data] Remove redundant data between
215 [25868] localedata: Incorrect trailing spaces in weekday names for
217 [26752] localedata: Please add the new locale zgh_MA
218 [27069] dynamic-link: Need a way to tell if a tunable is set by user
219 [27163] localedata: Error on test glk_IR with localedef
220 [27312] localedata: su_ID: new Sundanese locale
221 [27547] manual: "Summary of malloc-Related Functions" shows wrong
222 argument order for `aligned_alloc` and `memalign`
223 [27574] libc: glibc should probably not define __WORDSIZE=64 for
225 [27601] localedata: License information update in
226 localedata/locales/ast_ES
227 [28558] localedata: it_IT LC_MONETARY outdated p_cs_precedes and
229 [28787] localedata: Add information for Occitan
230 [29039] dynamic-link: Corrupt DTV after reuse of a TLS module ID
231 following dlclose with unused TLS
232 [29486] localedata: New Zealand locales (en_NZ & mi_NZ) first day of
233 week should be Monday
234 [29504] localedata: Incorrect/misleading Time Format For ms_MY (AM/PM)
235 [29506] localedata: UTF-8 HANGUL SYLLABLE bugs
236 [30349] libc: Support returning a pidfd from posix_spawn()
237 [30412] localedata: d_t_fmt in id_ID uses %r placeholder but am_pm and
238 t_fmt_ampm are undefined
239 [30605] localedata: New locale for Komi language
240 [30649] localedata: [PATCH] Add transliteration of common emojis to
242 [30694] locale: The iconv program no longer tells the user which given
243 encoding name was wrong
244 [30709] nscd: nscd fails to build with cleanup handler if built with
246 [30737] libc: fdopendir() is not robust - returns bogus DIR* instead
248 [30740] build: [m68k] undefined reference to
249 `_wordcopy_fwd_dest_aligned'
250 [30745] libc: Slight bug in cache info codes for x86
251 [30750] network: Unaligned accesses in resolver
252 [30773] math: [m68k] busybox awk is broken (lshift.S related)
253 [30789] libc: [2.38 Regression] sem_open will fail on multithreaded
254 scenarios when semaphore file doesn't exist (O_CREAT)
255 [30800] nscd: Improper assert in prune_cache triggers if clock jumps
257 [30804] libc: F_GETLK, F_SETLK, and F_SETLKW value change for
258 powerpc64 with -D_FILE_OFFSET_BITS=64
259 [30842] network: Stack read overflow in getaddrinfo in no-aaaa mode
261 [30843] network: potential use-after-free in getcanonname
263 [30854] localedata: Update locale data to Unicode 15.1.0
264 [30884] network: Memory leak in getaddrinfo after fix for bug 30843
266 [30932] libc: Fortify Source has false-positives when too many files
268 [30945] malloc: Core affinity setting incurs lock contentions between
270 [30960] math: signed integer overflow in
271 glibc/sysdeps/s390/fpu/feenablxcpt.c
272 [30964] locale: Number grouping check mishandles multibyte thousands
274 [30981] dynamic-link: dlclose does not properly implement force-first
276 [30988] math: fesetexcept raises floating-point exception traps on
278 [30989] math: fesetexcept raises floating-point exception traps on
280 [30990] libc: fesetexceptflag raises floating-point exception traps on
282 [30998] math: fesetexceptflag clears too many floating-point exception
284 [31019] manual: The documentation of feenableexcept is incomplete
285 [31022] math: feupdateenv (FE_DFL_ENV) crashes on riscv
286 [31035] libc: Library search path terminates on relative non-directory
288 [31042] libc: [s390x] .init and .fini padding
289 [31068] libc: sysdeps: sparc: invalid data access in memset due to
291 [31078] manual: Code example in "Noncanonical Mode Example" has unused
293 [31086] localedata: Errors in Tibetan, Dzongkha data
294 [31113] string: Wrong unwind information for rawmemchr on aarch64
295 [31151] libc: [RISC-V] missing support for profile/audit PLT setup
296 [31163] nss: getaddrinfo returns EAI_NONAME in oom situation
297 [31183] stdio: Wide stream buffer size reduced MB_LEN_MAX bytes after
299 [31184] dynamic-link: FAIL: elf/tst-tlsgap
300 [31185] dynamic-link: Incorrect thread point access in
301 _dl_tlsdesc_undefweak and _dl_tlsdesc_dynamic
302 [31187] dynamic-link: Some CET tests fail with GCC 14
303 [31204] localedata: Fix decimal point and thousands separator for
305 [31205] localedata: Inconsistent (mon_)grouping formats
306 [31218] dynamic-link: PLT rewrite overflows large displacement on x32
307 [31221] localedata: Add localedata for ISO code "tok" (Toki Pona)
308 [31230] dynamic-link: PLT rewrite failed without SELinux
309 [31239] localedata: anp_IN locale: abbreviated month names are the
310 same as the full month names
311 [31244] nptl: pthread_cancel hangs on sparc32
312 [31257] localedata: Sync with CLDR: “Turkey” -> “Türkiye”
313 [31266] string: sparc: string/tst-memmove-overflow fails on 32-bit
315 [31276] libc: Wrong condition for heap allocation in qsort_r
321 * When C2X features are enabled and the base argument is 0 or 2, the
322 following functions support binary integers prefixed by 0b or 0B as
323 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
324 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
325 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
326 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
327 following functions support binary integers prefixed by 0b or 0B as
328 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
329 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
330 functions also support the %b format for binary integers, with or
331 without such a prefix and independent of standards mode.
333 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
336 * printf-family functions now support the wN format length modifiers for
337 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
338 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
339 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
340 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
341 specified in draft ISO C2X.
343 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
344 Transparent Huge Pages (THP) in stack allocation at pthread_create.
346 * Support for x86_64 running on Hurd has been added. This port requires
347 as least binutils 2.40 and GCC 13:
351 * Vector math library libmvec support has been added to AArch64. It
352 requires GCC version >= 10.1.0. It can be disabled via
353 "--disable-mathvec", however that is not a supported configuration as
354 it changes the ABI. The symbol names follow the AArch64 vector ABI,
355 they are declared in math.h and have to be called manually at this point.
357 * The strlcpy and strlcat functions have been added. They are derived
358 from OpenBSD, and are expected to be added to a future POSIX version.
360 * A new configure option, "--enable-fortify-source", can be used to build the
361 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
362 provided, or is set to the highest value supported by the compiler. If not
363 explicitly enabled, then fortify source is forcibly disabled so to keep
364 original behavior unchanged.
366 Deprecated and removed features, and other changes affecting compatibility:
368 * libcrypt is no longer built by default; one may use the "--enable-crypt"
369 option to build libcrypt. libcrypt is likely to be removed from the
370 GNU C Library in a future release, so it is recommended that
371 applications port away from it to an alternative such as libxcrypt.
373 * In the Linux kernel for the hppa/parisc architecture some of the
374 MADV_XXX constants were changed to have the same values as the other
375 architectures. New programs compiled with this glibc version and which
376 use the madvise call will require at least Linux kernel version 6.2,
377 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
378 5.4.228, 4.19.270 or 4.14.303.
380 * The "--disable-experimental-malloc" option is no longer available. The
381 per-thread cache can still be disabled per-application using tunables
382 (glibc.malloc.tcache_count set to zero).
384 * The configure option "--enable-tunables" has been removed. The tunable
385 feature is now always enabled.
387 Changes to build and runtime requirements:
389 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
392 Security related changes:
394 CVE-2023-25139: When the printf family of functions is called with a
395 format specifier that uses an <apostrophe> (enable grouping) and a
396 minimum width specifier, the resulting output could be larger than
397 reasonably expected by a caller that computed a tight bound on the
398 buffer size. The resulting larger than expected output could result
399 in a buffer overflow in the printf family of functions.
401 The following bugs are resolved with this release:
403 [178] string: Please add strlcpy and strlcat (attached)
404 [14697] nptl: Behavior of exit is nonconformant with respect to
406 [15142] stdio: Missing locking in _IO_cleanup
407 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
408 [18906] stdio: fopen: ccs value may affect open mode
409 [24466] stdio: Feature request: provide special printf formats for
411 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
412 [28519] libc: system and popen should pass "--" between /bin/sh and
414 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
415 [29591] string: wcsnlen length can overflow in page cross case.
416 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
417 [30068] stdio: incorrect printf output for integers with thousands
418 separator and width field (CVE-2023-25139)
419 [30111] time: support_descriptors_list fails after 2038 on 32 bits
421 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
422 symlink for libraries without soname
423 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
425 [30156] time: Potential ntp_gettime abi break
426 [30235] libc: Missing fallback in getlogin if loginuid is unset
427 [30258] dynamic-link: sprof cannot read and display shared object
428 profiling data correctly
429 [30263] libc: Add test coverage for abs(), labs(), and llabs().
430 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
431 [30402] libc: FAIL: elf/tst-glibcelf
432 [30425] dynamic-link: Symbol lookup during dlclose may fail
434 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
435 [30477] libc: [RISCV]: time64 does not work on riscv32
436 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
438 [30527] network: resolv_conf lock not unlocked on allocation failure
439 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
441 [30555] string: strerror can incorrectly return NULL
442 [30579] malloc: trim_threshold in realloc lead to high memory usage
443 [30662] nscd: Group and password cache use errno in place of errval
449 * The getent tool now supports the --no-addrconfig option. The output of
450 getent with --no-addrconfig may contain addresses of families not
451 configured on the current host i.e. as-if you had not passed
452 AI_ADDRCONFIG to getaddrinfo calls.
454 Deprecated and removed features, and other changes affecting compatibility:
456 * The dynamic linker no longer loads shared objects from the "tls"
457 subdirectories on the library search path or the subdirectory that
458 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
459 search mechanism, which was deprecated in version 2.33.
461 Security related changes:
463 CVE-2022-39046: When the syslog function is passed a crafted input
464 string larger than 1024 bytes, it reads uninitialized memory from the
465 heap and prints it to the target log file, potentially revealing a
466 portion of the contents of the heap.
468 The following bugs are resolved with this release:
470 [12154] network: Cannot resolve hosts which have wildcard aliases
471 [12165] libc: readdir: Do not skip entries with zero d_ino values
472 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
473 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
474 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
475 AF_INET6 address (ie docker)
476 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
478 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
479 [28937] dynamic-link: New DSO dependency sorter does not put new map
481 [29249] libc: csu/libc-tls.c:202: undefined reference to
482 `_startup_fatal_not_constant'
483 [29305] network: Inefficient buffer space usage in nss_dns for
484 gethostbyname and other functions
485 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
486 [29402] nscd: nscd: No such file or directory
487 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
489 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
490 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
492 [29463] math: math/test-float128-y1 fails on x86_64
493 [29485] build: Make hangs when the test misc/tst-pidfile returns
495 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
497 [29499] build: Check failed on misc/tst-glibcsyscalls while building
498 for RISCV64 on a unmatched hardware
499 [29501] build: Check failed on stdlib/tst-strfrom while building for
500 RISCV64 on a unmatched hardware
501 [29502] libc: alpha sys/acct.h out of date
502 [29514] build: Need to use -fPIE not -fpie
503 [29528] dynamic-link: __libc_early_init not called after dlmopen that
505 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
506 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
508 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
510 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
512 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
513 [29576] build: librtld.os: in function `_dl_start_profile':
514 (.text+0x9444): undefined reference to `strcpy'
515 [29578] libc: Definition of SUN_LEN() is wrong
516 [29583] build: iconv failures on 32bit platform due to missing large
518 [29600] dynamic-link: dlmopen hangs after loading certain libraries
519 [29604] localedata: Update locale data to Unicode 15.0.0
520 [29605] nscd: Regression in NSCD backend of getaddrinfo
521 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
523 [29611] string: Optimized AVX2 string functions unconditionally use
525 [29624] malloc: errno is not cleared when entering main
526 [29638] libc: stdlib: arc4random fallback is never used
527 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
529 [29698] build: Configuring for AArch32 on ARMv8+ disables
531 [29727] locale: __strtol_internal out-of-bounds read when parsing
533 [29730] libc: broken y2038 support in fstatat on MIPS N64
534 [29746] libc: ppoll() does not switch to __ppoll64 when
535 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
536 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
537 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
538 aux.S: No such file or directory)
539 [29864] libc: __libc_start_main() should obtain program headers
540 address (_dl_phdr) from the auxv, not the ELF header.
541 [29951] time: daylight variable not set correctly if last DST change
542 coincides with offset change
543 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
544 length in fortify mode
550 * Support for DT_RELR relative relocation format has been added to
551 glibc. This is a new ELF dynamic tag that improves the size of
552 relative relocations in shared object files and position independent
553 executables (PIE). DT_RELR generation requires linker support for
554 -z pack-relative-relocs option, which is supported for some targets
555 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
557 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
558 have been added. The pidfd functionality provides access to a process
559 while avoiding the issue of PID reuse on traditional Unix systems.
561 * On Linux, the process_madvise function has been added. It has the
562 same functionality as madvise but alters the target process identified
565 * On Linux, the process_mrelease function has been added. It allows a
566 caller to release the memory of a dying process. The release of the
567 memory is carried out in the context of the caller, using the caller's
568 CPU affinity, and priority with CPU usage accounted to the caller.
570 * The “no-aaaa” DNS stub resolver option has been added. System
571 administrators can use it to suppress AAAA queries made by the stub
572 resolver, including AAAA lookups triggered by NSS-based interfaces
573 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
574 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
575 produce IPv6 addresses, and configured IPv6 name servers are still
576 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
577 are translated to A queries. The new resolver option is intended
578 primarily for diagnostic purposes, to rule out that AAAA DNS queries
579 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
580 validation by applications.
582 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
583 and mount_setattr have been added. They are part of the new Linux kernel
584 mount APIs that allow applications to more flexibly configure and operate
585 on filesystem mounts. The new mount APIs are specifically designed to work
588 * localedef now accepts locale definition files encoded in UTF-8.
589 Previously, input bytes not within the ASCII range resulted in
590 unpredictable output.
592 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
593 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
594 Support for the char8_t typedef has been added per the ISO C2X N2653
595 proposal. The functions are declared in uchar.h in C2X mode or when the
596 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
597 The char8_t typedef is declared in uchar.h in C2X mode or when the
598 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
599 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
601 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
602 added. The functions wrap getrandom and/or /dev/urandom to return high-
603 quality randomness from the kernel.
605 * Support for LoongArch running on Linux has been added. This port requires
606 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
609 - loongarch64-linux-gnu
611 The LoongArch ABI is 64-bit little-endian.
613 Deprecated and removed features, and other changes affecting compatibility:
615 * Support for prelink will be removed in the next release; this includes
616 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
617 variables and their functionality in the dynamic loader.
619 * The Linux kernel version check has been removed along with the
620 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
621 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
622 when libc.so is issued directly.
624 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
626 The following bugs are resolved with this release:
628 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
629 return different result with versioned "foo"
630 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
632 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
633 ./exe and ld.so adjusts argv on the stack
634 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
636 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
637 consuming the second byte of certain double byte characters
638 [25812] stdio: Libio vtable protection is sometimes only partially
640 [27054] libc: pthread_atfork handlers that call pthread_atfork
642 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
644 [28128] build: declare_symbol_alias doesn't work for assembly codes
645 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
646 [28752] nss: Segfault in getpwuid when stat fails
647 [28815] libc: realpath should not copy to resolved buffer on error
648 [28828] stdio: fputwc crashes
649 [28838] libc: FAIL: elf/tst-p_align3
650 [28845] locale: ld-monetary.c should be updated to match ISO C and
652 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
654 [28852] libc: getaddrinfo leaks memory with AI_ALL
655 [28853] libc: tst-spawn6 changes current foreground process group
656 (breaks test isolation)
657 [28857] libc: FAIL: elf/tst-audit24a
658 [28860] build: --enable-kernel=5.1.0 build fails because of missing
659 __convert_scm_timestamps
660 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
661 inaccurate without /sys and /proc
662 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
664 [28880] libc: Program crashes if date beyond 2038
665 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
666 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
667 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
668 rtm variants when avoiding overflow
669 [28922] build: The .d dependency files aren't always generated
670 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
672 [28936] build: nm: No such file
673 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
674 [28953] nss: NSS lookup result can be incorrect if function lookup
676 [28970] math: benchtest: libmvec benchmark doesn't build with make
678 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
679 /sys/devices/system/cpu/possible
680 [28993] libc: closefrom() iterates until max int if no access to
682 [28996] libc: realpath fails to copy partial result to resolved buffer
684 [29027] math: [ia64] fabs fails with sNAN input
685 [29029] nptl: poll() spuriously returns EINTR during thread
686 cancellation and with cancellation disabled
687 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
688 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
689 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
690 is promoted to global scope
691 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
692 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
693 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
695 [29097] time: fchmodat does not handle 64 bit time_t for
697 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
699 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
700 [29162] string: [PATCH] string.h syntactic error:
701 include/bits/string_fortified.h:110: error: expected ',' or ';'
702 before '__fortified_attr_access'
703 [29165] libc: [Regression] broken argv adjustment
704 [29187] dynamic-link: [regression] broken argv adjustment for nios2
705 [29193] math: sincos produces a different output than sin/cos
706 [29197] string: __strncpy_power9() uses uninitialised register vs18
707 value for filling after \0
708 [29203] libc: daemon is not y2038 aware
709 [29204] libc: getusershell is not 2038 aware
710 [29207] libc: posix_fallocate fallback implementation is not y2038
712 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
713 [29209] libc: isfdtype is not y2038 aware
714 [29210] network: ruserpass is not y2038 aware
715 [29211] libc: __open_catalog is not y2038 aware
716 [29213] libc: gconv_parseconfdir is not y2038 aware
717 [29214] nptl: pthread_setcanceltype fails to set type
718 [29225] network: Mistyped define statement in socket/sys/socket.h in
720 [29274] nptl: __read_chk is not a cancellation point
721 [29279] libc: undefined reference to `mbstowcs_chk' after
722 464d189b9622932a75302290625de84931656ec0
723 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
724 correct for !__ASSUME_TIME64_SYSCALLS
725 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
726 missing on microblaze with largefile
732 * Unicode 14.0.0 Support: Character encoding, character type info, and
733 transliteration tables are all updated to Unicode 14.0.0, using
734 generator scripts contributed by Mike FABIAN (Red Hat).
736 * Bump r_version in the debugger interface to 2 and add a new field,
737 r_next, support multiple namespaces.
739 * Support for the C.UTF-8 locale has been added to glibc. The locale
740 supports full code-point sorting for all valid Unicode code points. A
741 limitation in the framework for fnmatch, regexec, and regcomp requires
742 a compromise to save space and only ASCII-based range expressions are
743 supported for now (see bug 28255). The full size of the locale is
744 only ~400KiB, with 346KiB coming from LC_CTYPE information for
745 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
746 in various downstream distributions. The locale is not built into
747 glibc, and must be installed.
749 * <math.h> functions that round their results to a narrower type, and
750 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
751 18661-3:2015 and draft ISO C2X:
753 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
754 fMxsqrtfN and fMxsqrtfNx functions.
756 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
759 * <math.h> functions for floating-point maximum and minimum,
760 corresponding to new operations in IEEE 754-2019, and corresponding
761 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
762 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
763 fminimum_mag, fminimum_mag_num and corresponding functions for float,
764 long double, _FloatN and _FloatNx.
766 * <math.h> macros for single-precision float constants are added as a
767 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
768 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
771 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
772 predefined as specified in TS 18661-1:2014.
774 * The exp10 functions in <math.h> now have a corresponding type-generic
777 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
779 * printf-family functions now support the %b format for output of
780 integers in binary, as specified in draft ISO C2X, and the %B variant
781 of that format recommended by draft ISO C2X.
783 * A new DSO sorting algorithm has been added in the dynamic linker that uses
784 topological sorting by depth-first search (DFS), solving performance issues
785 of the existing sorting algorithm when encountering particular circular
786 object dependency cases.
788 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
789 the two DSO sorting algorithms. The default setting of '2' uses the
790 new DFS-based algorithm. The setting '1' switches to the old
791 algorithm used in glibc 2.33 and earlier.
793 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
794 to be used by compilers for optimizing usage of 'memcmp' when its
795 return value is only used for its boolean status.
797 * Support for automatically registering threads with the Linux rseq
798 system call has been added. This system call is implemented starting
799 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
800 operations on per-cpu data. It allows user-space to perform updates
801 on per-cpu data without requiring heavy-weight atomic operations.
802 Automatically registering threads allows all libraries, including
803 libc, to make immediate use of the rseq support by using the
804 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
805 variables. The GNU C Library manual has details on integration of
806 Restartable Sequences.
808 * A symbolic link to the dynamic linker is now installed under
809 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
811 * All programs and the testsuite in glibc are now built as position independent
812 executables (PIE) by default on toolchains and architectures that support it.
813 Further, if the toolchain and architecture supports it, even static programs
814 are built as PIE and the resultant glibc can be used to build static PIE
815 executables. A new option --disable-default-pie has been added to disable
816 this behavior and get a non-PIE build. This option replaces
817 --enable-static-pie, which no longer has any effect on the build
820 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
821 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
822 or to use huge pages directly with mmap calls with the MAP_HUGETLB
823 flags). The former can improve performance when Transparent Huge Pages
824 is set to 'madvise' mode while the latter uses the system reserved
827 * The printf family of functions now handles the flagged %#m conversion
828 specifier, printing errno as an error constant (similar to strerrorname_np).
830 * The function _dl_find_object has been added. In-process unwinders
831 can use it to efficiently locate unwinding information for a code
834 * Support for OpenRISC running on Linux has been added. This port requires
835 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
840 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
841 64-bit file offsets (LFS default).
843 * A new configure option, --with-rtld-early-cflags, can be used to
844 specify additional compiler flags for building the early startup code
845 of the dynamic linker. On targets which have CPU compatibility
846 checks, this can help to ensure that proper diagnostics are printed if
847 the dynamic loader runs on an incompatible CPU.
849 * On Linux, the epoll_pwait2 function has been added. It is similar to
850 epoll_wait with the difference the timeout has nanoseconds resolution.
852 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
853 enabling posix_spawn and posix_spawnp to set the controlling terminal in
854 the new process in a race free manner. This function is a GNU extension.
856 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
857 applications compiling with glibc and gcc 12 and later. Level 3 leverages
858 the __builtin_dynamic_object_size function to deliver additional
859 fortification balanced against additional runtime cost (checking non-constant
862 * The audit libraries will avoid unnecessary slowdown if it is not required
863 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
865 Deprecated and removed features, and other changes affecting compatibility:
867 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
868 has been removed since the first PT_LOAD segment is no longer executable
869 due to defaulting to -z separate-code.
871 * The r_version update in the debugger interface makes the glibc binary
872 incompatible with GDB binaries built without the following commits:
874 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
875 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
877 when audit modules or dlmopen are used.
879 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
881 * The --enable-static-pie option is no longer available. The glibc build
882 configuration script now automatically detects static-pie support in the
883 toolchain and architecture and enables it if available.
885 * The catchsegv script and associated libSegFault.so shared object have
886 been removed. There are widely-deployed out-of-process alternatives for
887 catching coredumps and backtraces.
889 * Support for prelink will be removed in the next release; this includes
890 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
891 variables and their functionality in the dynamic loader.
893 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
894 functionality to obtain the program mapping address can be achieved by
895 using LD_TRACE_LOADED_OBJECTS to value of 2.
897 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
898 support prelink PIE binaries.
900 Changes to build and runtime requirements:
902 * The audit module interface version LAV_CURRENT is increased to enable
903 proper bind-now support. The loader now advertises via the la_symbind
904 flags that PLT trace is not possible. New audit modules require the
905 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
906 modules are still loaded for all targets except aarch64.
908 * The audit interface on aarch64 is extended to support both the indirect
909 result location register (x8) and NEON Q register. Old audit modules are
910 rejected by the loader. Audit modules must be rebuilt to use the newer
911 structure sizes and the latest module interface version for LAV_CURRENT.
913 Security related changes:
915 CVE-2022-23219: Passing an overlong file name to the clnt_create
916 legacy function could result in a stack-based buffer overflow when
917 using the "unix" protocol. Reported by Martin Sebor.
919 CVE-2022-23218: Passing an overlong file name to the svcunix_create
920 legacy function could result in a stack-based buffer overflow.
922 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
923 function could result in a memory leak and potential access of
924 uninitialized memory. Reported by Qualys.
926 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
927 function may result in an off-by-one buffer underflow and overflow
928 when the current working directory is longer than PATH_MAX and also
929 corresponds to the / directory through an unprivileged mount
930 namespace. Reported by Qualys.
932 The following bugs are resolved with this release:
934 [12889] nptl: Race condition in pthread_kill
935 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
936 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
937 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
939 [15333] libc: Use 64-bit stat functions in installed programs
940 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
942 [15971] dynamic-link: No interface for debugger access to libraries
944 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
945 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
946 deeply nested DSO dependencies.
947 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
948 ID whose lifetime has not ended
949 [22542] network: buffer overflow in sunrpc clnt_create
951 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
953 [25947] malloc: memory leak in muntrace
954 [26045] math: fmaxf(inf, nan) does not always work
955 [26108] math: exp10() has problems with <tgmath.h>
956 [26779] build: benign use after realloc at localealias.c:329
957 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
958 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
959 [27945] build: build-many-glibcs.py doesn't configure GCC with
960 --enable-initfini-array
961 [27991] build: x86: sysdeps/x86/configure.ac breaks when
962 libc_cv_include_x86_isa_level is loaded from cache
963 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
964 in __REDIRECT_NTH macro
965 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
966 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
968 [28126] libc: nftw aborts for paths longer than PATH_MAX
969 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
970 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
972 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
973 [28185] math: Inaccurate j0f function (again)
974 [28199] locale: iconvconfig prefix flag behaves differently in glibc
976 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
977 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
979 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
980 [28223] libc: mips: clone does not align stack
981 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
983 [28256] malloc: Conditional jump or move depends on uninitialised
984 value(s) in __GI___tunables_init
985 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
986 spawn5 fail if stray fds are open
987 [28310] libc: Do not use affinity mask for sysconf
988 (_SC_NPROCESSORS_CONF)
989 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
991 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
993 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
994 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
996 [28353] network: Race condition on __opensock
997 [28357] dynamic-link: deadlock between pthread_create and ctors
998 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
999 [28361] nptl: Fix for bug 12889 causes setxid deadlock
1000 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
1001 [28390] localedata: Update locale data to Unicode 14.0.0
1002 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
1004 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
1005 locale "en_US.UTF-8"
1006 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
1007 to tgkill (getpid (), gettid())
1008 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
1009 [28457] dynamic-link: Missing reldepmod4.so dependency for
1011 [28469] time: linux: struct timex is not correctly set for 32-bit
1012 systems with TIMESIZE=64
1013 [28470] regex: Buffer read overrun in regular expression searching
1014 [28475] string: Incorrect access attribute on memfrob
1015 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
1016 spurious NUL character on state reset
1017 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
1019 [28550] dynamic-link: FAIL: tst-dso-
1020 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
1022 [28554] build: Undefined generate-md5
1023 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
1025 [28607] nptl: Masked signals are delivered on thread exit
1026 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
1027 lack of cpu counting /proc fallback with glibc 2.34
1028 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
1029 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
1030 [28648] dynamic-link: Running ld.so on statically linked binaries
1032 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
1034 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
1035 [28678] nptl: nptl/tst-create1 hangs sporadically
1036 [28688] dynamic-link: PT_LOAD p_align check is too strict
1037 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
1039 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
1040 timezones generated by tzcode-2021d and later
1041 [28713] math: GCC 12 miscompiles libm
1042 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
1043 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
1044 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
1045 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
1046 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
1047 Assertion `GL(dl_rtld_map).l_libname' failed!
1048 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
1049 [28757] nptl: GDB printer tests failed with new GDB
1050 [28765] math: x86_64 libmvec atan2 accuracy
1051 [28766] manual: Document libmvec accuracy
1052 [28768] network: Buffer overflow in svcunix_create with long pathnames
1054 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
1056 [28770] libc: Unexpected return value from realpath() for too long
1057 results (CVE-2021-3998)
1058 [28771] libc: %ebx optimization macros are incompatible with .altmacro
1060 [28780] build: --disable-default-pie doesn't work on static programs
1061 [28782] libc: x86-64 ISA level for glibc itself is always
1063 [28792] glob: possible wrong behaviour with patterns with double [
1065 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
1066 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
1067 empty mon_decimal_point_wc
1074 * In order to support smoother in-place-upgrades and to simplify
1075 the implementation of the runtime all functionality formerly
1076 implemented in the libraries libpthread, libdl, libutil, libanl has
1077 been integrated into libc. New applications do not need to link with
1078 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
1079 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
1080 provided, so that the linker options keep working. Applications which
1081 have been linked against glibc 2.33 or earlier continue to load the
1082 corresponding shared objects (which are now empty). The integration
1083 of those libraries into libc means that additional symbols become
1084 available by default. This can cause applications that contain weak
1085 references to take unexpected code paths that would only have been
1086 used in previous glibc versions when e.g. preloading libpthread.so.0,
1087 potentially exposing application bugs.
1089 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
1090 PTHREAD_STACK_MIN is no longer constant and is redefined to
1091 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
1092 sets for modern architectural features like Arm SVE.
1094 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
1095 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
1096 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
1097 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
1098 dynamic sized register sets for modern architectural features like
1101 * The dynamic linker implements the --list-diagnostics option, printing
1102 a dump of information related to IFUNC resolver operation and
1103 glibc-hwcaps subdirectory selection.
1105 * On Linux, the function execveat has been added. It operates similar to
1106 execve and it is is already used to implement fexecve without requiring
1107 /proc to be mounted. However, different than fexecve, if the syscall is not
1108 supported by the kernel an error is returned instead of trying a fallback.
1110 * The ISO C2X function timespec_getres has been added.
1112 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
1113 C2X, is supported to enable declarations of functions defined in Annex F
1114 of C2X. Those declarations are also enabled when
1115 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
1116 defined, and when _GNU_SOURCE is defined.
1118 * On powerpc64*, glibc can now be compiled without scv support using the
1119 --disable-scv configure option.
1121 * Add support for 64-bit time_t on configurations like x86 where time_t
1122 is traditionally 32-bit. Although time_t still defaults to 32-bit on
1123 these configurations, this default may change in future versions.
1124 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
1125 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
1126 only enabled for Linux and the full support requires a minimum kernel
1129 * The main gconv-modules file in glibc now contains only a small set of
1130 essential converter modules and the rest have been moved into a supplementary
1131 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
1132 in the same GCONV_PATH. Similarly, external converter modules directories
1133 may have supplementary configuration files in a gconv-modules.d directory
1134 with names ending with .conf to logically classify the converter modules in
1137 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
1138 to configure the size of the thread stack cache.
1140 * The function _Fork has been added as an async-signal-safe fork replacement
1141 since Austin Group issue 62 dropped the async-signal-safe requirement for
1142 fork (and it will be included in the future POSIX standard). The new _Fork
1143 function does not run any atfork function neither resets any internal state
1144 or lock (such as the malloc one), and only sets up a minimal state required
1145 to call async-signal-safe functions (such as raise or execve). This function
1146 is currently a GNU extension.
1148 * On Linux, the close_range function has been added. It allows efficiently
1149 closing a range of file descriptors on recent kernels (version 5.9).
1151 * The function closefrom has been added. It closes all file descriptors
1152 greater than or equal to a given integer. This function is a GNU extension,
1153 although it is also present in other systems.
1155 * The posix_spawn_file_actions_addclosefrom_np function has been added,
1156 enabling posix_spawn and posix_spawnp to close all file descriptors greater
1157 than or equal to a given integer. This function is a GNU extension,
1158 although Solaris also provides a similar function.
1160 * When invoked explicitly, the dynamic linker now uses the kernel to
1161 execute programs that do not have any dynamic dependency (that is,
1162 they are statically linked). This feature is Linux-specific.
1164 Deprecated and removed features, and other changes affecting compatibility:
1166 * The function pthread_mutex_consistent_np has been deprecated; programs
1167 should use the equivalent standard function pthread_mutex_consistent
1170 * The function pthread_mutexattr_getrobust_np has been deprecated;
1171 programs should use the equivalent standard function
1172 pthread_mutexattr_getrobust instead.
1174 * The function pthread_mutexattr_setrobust_np has been deprecated;
1175 programs should use the equivalent standard function
1176 pthread_mutexattr_setrobust instead.
1178 * The function pthread_yield has been deprecated; programs should use
1179 the equivalent standard function sched_yield instead.
1181 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
1183 * Various rarely-used functions declared in <resolv.h> and
1184 <arpa/nameser.h> have been deprecated. Applications are encouraged to
1185 use dedicated DNS processing libraries if applicable. For <resolv.h>,
1186 this affects the functions dn_count_labels, fp_nquery, fp_query,
1187 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
1188 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
1189 p_type, putlong, putshort, res_hostalias, res_isourserver,
1190 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
1191 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
1192 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
1193 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
1195 * Various symbols previously defined in libresolv have been moved to libc
1196 in order to prepare for libresolv moving entirely into libc (see earlier
1197 entry for merging libraries into libc). The symbols __dn_comp,
1198 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
1199 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
1200 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
1201 __res_search, __res_send formerly in libresolv have been renamed and no
1202 longer have a __ prefix. They are now available in libc.
1204 * The pthread cancellation handler is now installed with SA_RESTART and
1205 pthread_cancel will always send the internal SIGCANCEL on a cancellation
1206 request. It should not be visible to applications since the cancellation
1207 handler should either act upon cancellation (if asynchronous cancellation
1208 is enabled) or ignore the cancellation internal signal. However there are
1209 buggy kernel interfaces (for instance some CIFS versions) that could still
1210 see a spurious EINTR error when cancellation interrupts a blocking syscall.
1212 * Previously, glibc installed its various shared objects under versioned
1213 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
1214 were provided as symbolic links. Starting with glibc 2.34, the shared
1215 objects are installed under their ABI sonames directly, without
1216 symbolic links. This increases compatibility with distribution
1217 package managers that delete removed files late during the package
1218 upgrade or downgrade process.
1220 * The symbols mallwatch and tr_break are now deprecated and no longer used in
1221 mtrace. Similar functionality can be achieved by using conditional
1222 breakpoints within mtrace functions from within gdb.
1224 * The __morecore and __after_morecore_hook malloc hooks and the default
1225 implementation __default_morecore have been removed from the API. Existing
1226 applications will continue to link against these symbols but the interfaces
1227 no longer have any effect on malloc.
1229 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
1230 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
1231 disabled by default in the main C library. Users looking to use these
1232 features now need to preload a new debugging DSO libc_malloc_debug.so to get
1233 this functionality back.
1235 * The deprecated functions malloc_get_state and malloc_set_state have been
1236 moved from the core C library into libc_malloc_debug.so. Legacy applications
1237 that still use these functions will now need to preload libc_malloc_debug.so
1238 in their environment using the LD_PRELOAD environment variable.
1240 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
1241 __memalign_hook and __free_hook are now removed from the API. Compatibility
1242 symbols are present to support legacy programs but new applications can no
1243 longer link to these symbols. These hooks no longer have any effect on glibc
1244 functionality. The malloc debugging DSO libc_malloc_debug.so currently
1245 supports hooks and can be preloaded to get this functionality back for older
1246 programs. However this is a transitional measure and may be removed in a
1247 future release of the GNU C Library. Users may port away from these hooks by
1248 writing and preloading their own malloc interposition library.
1250 Changes to build and runtime requirements:
1252 * On Linux, the shm_open, sem_open, and related functions now expect the
1253 file shared memory file system to be mounted at /dev/shm. These functions
1254 no longer search among the system's mount points for a suitable
1255 replacement if /dev/shm is not available.
1257 Security related changes:
1259 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1260 a request for netgroup lookup, may crash due to a double-free,
1261 potentially resulting in degraded service or Denial of Service on the
1262 local system. Reported by Chris Schanzle.
1264 CVE-2021-33574: The mq_notify function has a potential use-after-free
1265 issue when using a notification type of SIGEV_THREAD and a thread
1266 attribute with a non-default affinity mask.
1268 CVE-2021-35942: The wordexp function may overflow the positional
1269 parameter number when processing the expansion resulting in a crash.
1270 Reported by Philippe Antoine.
1272 The following bugs are resolved with this release:
1274 [4737] libc: fork is not async-signal-safe
1275 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1276 [10353] libc: Methods for deleting all file descriptors greater than
1277 given integer (closefrom)
1278 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1279 name containing multi-byte character(s)
1280 [14469] math: Inaccurate j0f function
1281 [14470] math: Inaccurate j1f function
1282 [14471] math: Inaccurate y0f function
1283 [14472] math: Inaccurate y1f function
1284 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1286 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1287 crashes if it fails dlsym() twice
1288 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1289 [16063] nptl: Provide a pthread_once variant in libc directly
1290 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1291 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1292 [17183] manual: description of ENTRY struct in <search.h> in glibc
1294 [18435] nptl: pthread_once hangs when init routine throws an exception
1295 [18524] nptl: Missing calloc error checking in
1296 __cxa_thread_atexit_impl
1297 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1298 pthread_create and dlopen
1299 [19366] nptl: returning from a thread should disable cancellation
1300 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1301 when non-root user changes priority
1302 [20802] dynamic-link: getauxval NULL pointer dereference after static
1304 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1305 [22057] malloc: malloc_usable_size is broken with mcheck
1306 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1308 [23323] libc: [RFE] CSU startup hardening.
1309 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1311 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1312 $PLATFORM, $ORIGIN) crashes
1313 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1314 [23554] nptl: pthread_getattr_np reports wrong stack size with
1316 [24106] libc: Bash interpreter in ldd script is taken from host
1317 [24773] dynamic-link: dlerror in an secondary namespace does not use
1318 the right free implementation
1319 [25036] localedata: Update collation order for Swedish
1320 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1321 shm_open to pick wrong directory
1322 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1323 crash in IFUNC resolver due to stack canary (--enable-stack-
1325 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1326 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1327 [27111] dynamic-link: pthread_create and tls access use link_map
1328 objects that may be concurrently freed by dlclose
1329 [27132] malloc: memusagestat is linked to system librt, leading to
1330 undefined symbols on major version upgrade
1331 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1333 [27249] libc: libSegFault.so does not output signal number properly
1334 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1336 [27318] dynamic-link: glibc fails to load binaries when built with
1337 -march=sandybridge: CPU ISA level is lower than required
1338 [27343] nss: initgroups() SIGSEGVs when called on a system without
1339 nsswich.conf (in a chroot)
1340 [27346] dynamic-link: x86: PTWRITE feature check is missing
1341 [27389] network: NSS chroot hardening causes regressions in chroot
1343 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1344 [27444] libc: sysconf reports unsupported option (-1) for
1345 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1346 [27462] nscd: double-free in nscd (CVE-2021-27645)
1347 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1348 malloc/tst-malloc-thread-fail
1349 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1350 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1352 [27522] glob: glob, glob64 incorrectly marked as __THROW
1353 [27555] dynamic-link: Static tests fail with --enable-stack-
1355 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1356 information for the current directory
1357 [27577] dynamic-link: elf/ld.so --help doesn't work
1358 [27605] libc: tunables can't control xsave/xsavec selection in
1359 dl_runtime_resolve_*
1360 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1361 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1363 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1364 _nss_files_getcanonname_r) from within a dlmopen namespace.
1365 [27648] libc: FAIL: misc/tst-select
1366 [27650] stdio: vfscanf returns too early if a match is longer than
1368 [27651] libc: Performance regression after updating to 2.33
1369 [27655] string: Wrong size calculation in string/test-strnlen.c
1370 [27706] libc: select fails to update timeout on error
1371 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1372 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1373 tries resolving them lazily
1374 [27744] nptl: Support different libpthread/ld.so load orders in
1376 [27749] libc: Data race __run_exit_handlers
1377 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1379 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1380 exceeds maximum object size 2147483647
1381 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1383 [27872] build: Obsolete configure option --enable-stackguard-
1385 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1386 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1387 [27892] libc: powerpc: scv ABI error handling fails to check
1389 [27896] nptl: mq_notify does not handle separately allocated thread
1390 attributes (CVE-2021-33574)
1391 [27901] libc: TEST_STACK_ALIGN doesn't work
1392 [27902] libc: The x86-64 clone wrapper fails to align child stack
1393 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1394 [27939] libc: aarch64: clone does not align the stack
1395 [27968] libc: s390x: clone does not align the stack
1396 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1397 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1398 with n >= 0x80000000
1399 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1400 thread never allocated anything
1401 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1402 [28064] string: x86_64:wcslen implementation list has wcsnlen
1403 [28067] libc: FAIL: posix/tst-spawn5
1404 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1405 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1407 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1408 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1409 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1411 [28091] network: ns_name_skip may return 0 for domain names without
1419 * The dynamic linker accepts the --list-tunables argument which prints
1420 all the supported tunables. This option is disable if glibc is
1421 configured with tunables disabled (--enable-tunables=no).
1423 * The dynamic linker accepts the --argv0 argument and provides opportunity
1424 to change argv[0] string.
1426 * The dynamic linker loads optimized implementations of shared objects
1427 from subdirectories under the glibc-hwcaps directory on the library
1428 search path if the system's capabilities meet the requirements for
1429 that subdirectory. Initially supported subdirectories include
1430 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1431 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1432 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1433 subdirectory names correspond to the vendor-independent x86-64
1434 microarchitecture levels defined in the x86-64 psABI supplement.
1436 * The new --help option of the dynamic linker provides usage and
1437 information and library search path diagnostics.
1439 * The mallinfo2 function is added to report statistics as per mallinfo,
1440 but with larger field widths to accurately report values that are
1441 larger than fit in an integer.
1443 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1445 * Support for the RISC-V ISA running on Linux has been expanded to run on
1446 32-bit hardware. This is supported for the following ISA and ABI pairs:
1452 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1455 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1456 glibc may use additional checks that may have an additional performance
1457 overhead. At present these checks are available only on LLVM 9 and later.
1458 The latest GCC available at this time (10.2) does not support this level of
1461 Deprecated and removed features, and other changes affecting compatibility:
1463 * The mallinfo function is marked deprecated. Callers should call
1466 * When dlopen is used in statically linked programs, alternative library
1467 implementations from HWCAP subdirectories are no longer loaded.
1468 Instead, the default implementation is used.
1470 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1471 removed. To support old binaries, the vtimes function continues to exist
1472 as a compatibility symbol. Applications should use the getrlimit or
1475 * Following a change in the tzdata 2018a release upstream, the zdump
1476 program is now installed in the /usr/bin subdirectory. Previously,
1477 the /usr/sbin subdirectory was used.
1479 * On s390(x), the type float_t is now derived from the macro
1480 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1481 hardcoded to double. This does not affect the ABI of any libraries
1482 that are part of the GNU C Library, but may affect the ABI of other
1483 libraries that use this type in their interfaces. The new definition
1484 improves consistency with compiler behavior in many scenarios.
1486 * A future version of glibc will stop loading shared objects from the
1487 "tls" subdirectories on the library search path, the subdirectory that
1488 corresponds to the AT_PLATFORM system name, and also stop employing
1489 the legacy AT_HWCAP search mechanism. Applications should switch to
1490 the new glibc-hwcaps mechanism instead; if they do not do that, only
1491 the baseline version (directly from the search path directory) will be
1494 Changes to build and runtime requirements:
1496 * On Linux, the system administrator needs to configure /dev/pts with
1497 the intended access modes for pseudo-terminals. glibc no longer
1498 attempts to adjust permissions of terminal devices. The previous glibc
1499 defaults ("tty" group, user read/write and group write) already
1500 corresponded to what most systems used, so that grantpt did not
1501 perform any adjustments.
1503 * On Linux, the posix_openpt and getpt functions no longer attempt to
1504 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1505 (and pseudo-terminals are supported), a devpts file system is mounted
1506 on /dev/pts. Current systems already meet these requirements.
1508 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1510 Security related changes:
1512 CVE-2021-3326: An assertion failure during conversion from the
1513 ISO-20220-JP-3 character set using the iconv function has been fixed.
1514 This assertion was triggered by certain valid inputs in which the
1515 converted output contains a combined sequence of two wide characters
1516 crossing a buffer boundary. Reported by Tavis Ormandy.
1518 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1519 invoked with input containing redundant shift sequences in the IBM1364,
1520 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1522 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1523 when invoked with UCS4 input containing an invalid character.
1525 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1526 invoked with EUC-KR input containing invalid multibyte input sequences.
1528 The following bugs are resolved with this release:
1530 [10635] libc: realpath portability patches
1531 [16124] dynamic-link: ld.so should allow to change argv[0]
1532 [17924] malloc: 'free' should not set errno
1533 [18683] libc: Linux faccessat implementation can incorrectly ignore
1535 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1536 [23091] hurd: missing waitid support
1537 [23249] libc: Epyc and other current AMD CPUs do not select the
1538 "haswell" platform subdirectory
1539 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1541 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1543 [24941] libc: Make grantpt usable after multi-threaded fork in more
1545 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1546 [24973] locale: iconv encounters segmentation fault when converting
1547 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1548 [25399] string: undefined reference to `__warn_memset_zero_len' when
1549 changing gnuc version
1550 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1552 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1554 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1555 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1556 [26100] libc: Race in syslog(3) with regards to tag printing.
1557 [26124] libc: Export <cpu-features.h>
1558 [26130] nscd: Inconsistent nscd cache during pruning
1559 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1560 [26224] locale: iconv hangs when converting some invalid inputs from
1561 several IBM character sets (CVE-2020-27618)
1562 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1563 too much stack space
1564 [26343] manual: invalid documented return type for strerrorname_np(),
1565 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1566 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1568 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1570 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1571 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1573 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1574 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1575 [26555] string: strerrorname_np does not return the documented value
1576 [26592] libc: pointer arithmetic overflows in realpath
1577 [26600] network: Transaction ID collisions cause slow DNS lookups in
1579 [26606] libc: [2.33 Regression] pselect is broken on x32
1580 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1581 [26620] glob: fnmatch with collating symbols results in segmentation
1583 [26625] libc: [2.33 Regression] CET is disabled
1584 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1585 at the end of a memory mapping
1586 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1587 by the caller to the kernel
1588 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1589 [26647] build: [-Werror=array-parameter=] due to different
1590 declarations for __sigsetjmp
1591 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1593 [26649] stdio: printf should handle non-normal x86 long double numbers
1594 gracefully (CVE-2020-29573)
1595 [26686] build: -Warray-parameter instances building with GCC 11
1596 [26687] build: -Warray-bounds instances building with GCC 11
1597 [26690] stdio: Aliasing violation in __vfscanf_internal
1598 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1599 [26726] build: GCC warning calling new_composite_name with an array of
1601 [26736] libc: FAIL: misc/tst-sysvshm-linux
1602 [26737] libc: Random FAIL: rt/tst-shm
1603 [26791] libc: Missing O_CLOEXEC in sysconf.c
1604 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1606 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1608 [26818] string: aarch64: string tests may run ifunc variants that are
1610 [26821] libc: Memory leak test failures on Fedora 33
1611 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1612 FSGSBASE/LM/RDRAND check failure
1613 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1615 [26853] libc: aarch64: Missing unwind information in statically linked
1617 [26923] locale: Assertion failure in iconv when converting invalid
1618 UCS4 (CVE-2020-29562)
1619 [26926] dynamic-link: aarch64: library dependencies are not bti
1621 [26932] libc: sh: Multiple floating point functions defined as stubs
1623 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1625 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1627 [27002] build: libc_freeres_fn build failure with GCC 11
1628 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1629 [27008] dynamic-link: ld.so.cache should have endianness markup
1630 [27042] libc: [alpha] anonymous union in struct stat confuses
1632 [27053] libc: Conformance regression in system(3) (and probably also
1634 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1636 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1637 [27083] libc: Unsafe unbounded alloca in addmntent
1638 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1640 [27130] string: "rep movsb" performance issue
1641 [27150] libc: alpha: wait4() is unavailable in static linking
1642 [27177] dynamic-link:
1643 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1645 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1646 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1647 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1648 related to combining characters (CVE-2021-3326)
1655 * Unicode 13.0.0 Support: Character encoding, character type info, and
1656 transliteration tables are all updated to Unicode 13.0.0, using
1657 generator scripts contributed by Mike FABIAN (Red Hat).
1659 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1661 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1662 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1663 Three ABIs are supported:
1669 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1670 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1672 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1673 DT_DEPAUDIT dynamic section entries of the main executable.
1675 * powerpc64le supports IEEE128 long double libm/libc redirects when
1676 using -mabi=ieeelongdouble to compile C code on supported GCC
1677 toolchains. It is recommended to use GCC 8 or newer when testing
1680 * To help detect buffer overflows and other out-of-bounds accesses
1681 several APIs have been annotated with GCC 'access' attribute. This
1682 should help GCC 10 issue better warnings.
1684 * On Linux, functions pthread_attr_setsigmask_np and
1685 pthread_attr_getsigmask_np have been added. They allow applications
1686 to specify the signal mask of a thread created with pthread_create.
1688 * The GNU C Library now provides the header file <sys/single_threaded.h>
1689 which declares the variable __libc_single_threaded. Applications are
1690 encouraged to use this variable for single-thread optimizations,
1691 instead of weak references to symbols historically defined in
1694 * The functions sigabbrev_np and sigdescr_np have been added. The
1695 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1696 SIGHUP) while sigdescr_np returns a string describing the signal number
1697 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1698 attempt to translate the return description, both functions return
1699 NULL for an invalid signal number.
1701 They should be used instead of sys_siglist or sys_sigabbrev and they
1702 are both thread and async-signal safe. These functions are GNU extensions.
1704 * The functions strerrorname_np and strerrordesc_np have been added. The
1705 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1706 while strerrordesc_np returns a string describing the error number
1707 (e.g "Invalid argument" for EINVAL). Different than strerror,
1708 strerrordesc_np does not attempt to translate the return description, both
1709 functions return NULL for an invalid error number.
1711 They should be used instead of sys_errlist and sys_nerr, both are
1712 thread and async-signal safe. These functions are GNU extensions.
1714 * AArch64 now supports standard branch protection security hardening
1715 in glibc when it is built with a GCC that is configured with
1716 --enable-standard-branch-protection (or if -mbranch-protection=standard
1717 flag is passed when building both GCC target libraries and glibc,
1718 in either case a custom GCC is needed). This includes branch target
1719 identification (BTI) and pointer authentication for return addresses
1720 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1721 extensions respectively for the protection to be effective,
1722 otherwise the used instructions are nops. User code can use PAC-RET
1723 without libc support, but BTI requires a libc that is built with BTI
1724 support, otherwise runtime objects linked into user code will not be
1727 Deprecated and removed features, and other changes affecting compatibility:
1729 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1730 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1731 RPC header files. Backward compatibility for old programs is kept
1732 only for architectures and ABIs that have been added in or before
1733 glibc 2.31. New programs need to use TI-RPC
1734 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1735 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1737 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1738 as shared library for backward compatibility and the NSS modules "nis"
1739 and "nisplus" are not built at all and libnsl's headers aren't
1740 installed. This compatibility is kept only for architectures and ABIs
1741 that have been added in or before version 2.28. Replacement
1742 implementations based on TI-RPC, which additionally support IPv6, are
1743 available from <https://github.com/thkukuk/>. This change does not
1744 affect the "compat" NSS module, which does not depend on libnsl
1745 since 2.27 and thus can be used without NIS.
1747 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1748 removed. To support old binaries, the sysctl function continues to
1749 exist as a compatibility symbol (on those architectures which had it),
1750 but always fails with ENOSYS. This reflects the removal of the system
1751 call from all architectures, starting with Linux 5.5.
1753 * The sstk function is no longer available to newly linked binaries.
1754 Its implementation always returned with a failure, and the function
1755 was not declared in any header file.
1757 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1758 sigrelse, sigignore and sigset, and the sigmask macro have been
1759 deprecated. Applications should use the sigsuspend, sigprocmask and
1760 sigaction functions instead.
1762 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1763 already supported this format for almost 20 years.
1765 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1766 are no longer available to newly linked binaries, and their declarations
1767 have been removed from <string.h>. They are exported solely as
1768 compatibility symbols to support old binaries. All programs should use
1771 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1772 are no longer available to newly linked binaries, and their declarations
1773 have been removed from <stdio.h>. They are exported solely as
1774 compatibility symbols to support old binaries. All programs should use
1775 strerror or strerror_r instead.
1777 * Both strerror and strerror_l now share the same internal buffer in the
1778 calling thread, meaning that the returned string pointer may be invalided
1779 or contents might be overwritten on subsequent calls in the same thread or
1780 if the thread is terminated. It makes strerror MT-safe.
1782 * Using weak references to libpthread functions such as pthread_create
1783 or pthread_key_create to detect the singled-threaded nature of a
1784 program is an obsolescent feature. Future versions of glibc will
1785 define pthread_create within libc.so.6 itself, so such checks will
1786 always flag the program as multi-threaded. Applications should check
1787 the __libc_single_threaded variable declared in
1788 <sys/single_threaded.h> instead.
1790 * The "files" NSS module no longer supports the "key" database (used for
1791 secure RPC). The contents of the /etc/publickey file will be ignored,
1792 regardless of the settings in /etc/nsswitch.conf. (This method of
1793 storing RPC keys only supported the obsolete and insecure AUTH_DES
1794 flavor of secure RPC.)
1796 * The __morecore and __after_morecore_hook malloc hooks and the default
1797 implementation __default_morecore have been deprecated. Applications
1798 should use malloc interposition to change malloc behavior, and mmap to
1799 allocate anonymous memory. A future version of glibc may require that
1800 applications which use the malloc hooks must preload a special shared
1801 object, to enable the hooks.
1803 * The hesiod NSS module has been deprecated and will be removed in a
1804 future version of glibc. System administrators are encouraged to
1805 switch to other approaches for networked account databases, such as
1808 Changes to build and runtime requirements:
1810 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1811 long double redirects.
1813 Security related changes:
1815 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1816 invoked with the -c option and when processing invalid multi-byte input
1817 sequences. Reported by Jan Engelhardt.
1819 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1820 corruption when they were passed a pseudo-zero argument. Reported by Guido
1821 Vranken / ForAllSecure Mayhem.
1823 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1824 expanding ~user has been fixed.
1826 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1827 memmove functions has been fixed. Discovered by Jason Royes and Samual
1828 Dytrych of the Cisco Security Assessment and Penetration Team (See
1831 The following bugs are resolved with this release:
1833 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1834 [10441] manual: Backtraces code example lacks error checking
1835 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1836 timer_sigev_thread dangerous
1837 [14231] stdio: stdio-common tests memory requirements
1838 [14578] libc: /proc-based emulation for lchmod, fchmodat
1839 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1840 filtee has constructor
1841 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1842 sequences (CVE-2016-10228)
1843 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1844 character entities for infinity & pi
1845 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1846 segfaults in applications
1847 [20543] libc: Please move from .gnu.linkonce to comdat
1848 [22489] network: gcc warns about implicit conversion in
1849 ICMP6_FILTER_SETPASS with -Wsign-conversion
1850 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1851 [23294] math: Complex _FloatN functions are redirected to the wrong
1852 function with -mlong-double-64
1853 [23296] libc: Data race in setting function descriptor during lazy
1855 [23668] dynamic-link: ldconfig: Default to the new format for
1857 [23819] hurd: hurd: Add C11 thread support
1858 [23990] build: test-container error out on failure to exec child.
1859 [23991] build: shell-container typo in run_command_array
1860 [24638] manual: Error in example of parsing a template string
1861 [24654] manual: Wrong declaration of wcschr in libc manual
1862 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1864 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1865 dynamically loaded dsos
1866 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1867 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1869 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1870 restore EAX, ECX and EDX
1871 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1872 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1873 [25420] network: Race condition in resolv_conf.c can result in caching
1874 stale configuration forever
1875 [25487] math: sinl() stack corruption from crafted input
1877 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1879 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1880 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1882 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1883 on 32 bit and old kernel
1884 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1885 [25639] localedata: Some names of days and months wrongly spelt in
1887 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1888 amount of sigset_t bytes
1889 [25691] stdio: printf: memory leak when printing long multibyte
1891 [25715] libc: system() returns wrong errors when posix_spawn fails
1892 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1893 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1894 state for conversions that produce two Unicode code points
1895 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1896 for linux x86_64 leads to livelock
1897 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1898 test failures, invalid instruction in ld.so
1899 [25790] glob: Typo in tst-fnmatch.input
1900 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1902 [25819] localedata: Update locale data to Unicode 13.0.0
1903 [25824] libc: Abnormal function of strnlen in aarch64
1904 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1905 [25896] libc: Incorrect prctl
1906 [25902] libc: Bad LOADARGS_N
1907 [25905] dynamic-link: VSX registers are corrupted during PLT
1908 resolution when glibc is built with --disable-multi-arch and --with-
1910 [25933] string: Off by one error in __strncmp_avx2 when
1911 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1913 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1914 exiting detached thread
1915 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1917 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1919 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1920 [26073] math: getpayload() has wrong return value
1921 [26076] dynamic-link: dlmopen crashes after failing to load
1922 dependencies in audit mode
1923 [26120] localedata: column width of of some Korean
1924 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1925 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1926 [26133] libc: Incorrect need_arch_feature_F16C
1927 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1929 [26149] libc: PKU is usable only if OSPKE is set
1930 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1932 [26208] libc: Incorrect bit_cpu_CLFSH
1933 [26210] network: Incorrect use of hidden symbols for global sunrpc
1935 [26211] stdio: printf integer overflow calculating allocation size
1936 [26214] stdio: printf_fp double free
1937 [26215] stdio: printf_fp memory leak
1938 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1939 [26258] nss: nss_compat should not read input files with mmap
1940 [26332] string: Incorrect cache line size load causes memory
1941 corruption in memset
1948 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1949 enable features from the draft ISO C2X standard. Only some features from
1950 this draft standard are supported by the GNU C Library, and as the draft
1951 is under active development, the set of features enabled by this macro is
1952 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1953 by compiling with "gcc -std=gnu2x".
1955 * The <math.h> functions that round their results to a narrower type now
1956 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1957 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1958 Clarification Request 13 to TS 18661-3.
1960 * The function pthread_clockjoin_np has been added, enabling join with a
1961 terminated thread with a specific clock. It allows waiting against
1962 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1964 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1966 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1967 in queries if the trust-ad option is set via the options directive in
1968 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1969 mode, the AD bit, as provided by the name server, is available to
1970 applications which call res_search and related functions. In the default
1971 mode, the AD bit is not set in queries, and it is automatically cleared in
1972 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1973 servers and the network path to them are treated as untrusted.)
1975 Deprecated and removed features, and other changes affecting compatibility:
1977 * The totalorder and totalordermag functions, and the corresponding
1978 functions for other floating-point types, now take pointer arguments to
1979 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1980 passing. This is in accordance with the resolution of Clarification
1981 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1982 floating-point arguments directly will continue to work.
1984 * The obsolete function stime is no longer available to newly linked
1985 binaries, and its declaration has been removed from <time.h>.
1986 Programs that set the system time should use clock_settime instead.
1988 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1989 in a future version of glibc. In this release, the header still exists
1990 but calling ftime will cause a compiler warning. All programs should use
1991 gettimeofday or clock_gettime instead.
1993 * The gettimeofday function no longer reports information about a
1994 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1995 many years, as it cannot handle the full complexity of the world's
1996 timezones, but hitherto we have supported it on a best-effort basis.
1997 Changes required to support 64-bit time_t on 32-bit architectures have
1998 made this no longer practical.
2000 As of this release, callers of gettimeofday with a non-null 'tzp' argument
2001 should expect to receive a 'struct timezone' whose tz_minuteswest and
2002 tz_dsttime fields are zero. (For efficiency reasons, this does not always
2003 happen on a few Linux-based ports. This will be corrected in a future
2006 All callers should supply a null pointer for the 'tzp' argument to
2007 gettimeofday. For accurate information about the time zone associated
2008 with the current time, use the localtime function.
2010 gettimeofday itself is obsolescent according to POSIX. We have no plans
2011 to remove access to this function, but portable programs should consider
2012 using clock_gettime instead.
2014 * The settimeofday function can still be used to set a system-wide time
2015 zone when the operating system supports it. This is because the Linux
2016 kernel reused the API, on some architectures, to describe a system-wide
2017 time-zone-like offset between the software clock maintained by the kernel,
2018 and the "RTC" clock that keeps time when the system is shut down.
2020 However, to reduce the odds of this offset being set by accident,
2021 settimeofday can no longer be used to set the time and the offset
2022 simultaneously. If both of its two arguments are non-null, the call
2023 will fail (setting errno to EINVAL).
2025 Callers attempting to set this offset should also be prepared for the call
2026 to fail and set errno to ENOSYS; this already happens on the Hurd and on
2027 some Linux architectures. The Linux kernel maintainers are discussing a
2028 more principled replacement for the reused API. After a replacement
2029 becomes available, we will change settimeofday to fail with ENOSYS on all
2030 platforms when its 'tzp' argument is not a null pointer.
2032 settimeofday itself is obsolescent according to POSIX. Programs that set
2033 the system time should use clock_settime and/or the adjtime family of
2034 functions instead. We may cease to make settimeofday available to newly
2035 linked binaries after there is a replacement for Linux's time-zone-like
2038 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
2039 the optional CAS instruction is implemented (for instance, LEON processors
2040 are still supported, but SuperSPARC processors are not).
2042 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
2045 * If a lazy binding failure happens during dlopen, during the execution of
2046 an ELF constructor, the process is now terminated. Previously, the
2047 dynamic loader would return NULL from dlopen, with the lazy binding error
2048 captured in a dlerror message. In general, this is unsafe because
2049 resetting the stack in an arbitrary function call is not possible.
2051 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
2052 executable stack unless explicitly configured at build time to require
2053 minimum kernel version 4.8 or newer. This is because executing
2054 floating-point branches on a non-executable stack on Linux kernels prior to
2055 4.8 can lead to application crashes for some MIPS configurations. While
2056 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
2057 expected to enable non-executable stack by default with PT_GNU_STACK by
2058 default and is thus likely to trigger a crash on older kernels.
2060 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
2061 non-executable stack while dropping support for older kernels.
2063 * System call wrappers for time system calls now use the new time64 system
2064 calls when available. On 32-bit targets, these wrappers attempt to call
2065 the new system calls first and fall back to the older 32-bit time system
2066 calls if they are not present. This may cause issues in environments
2067 that cannot handle unsupported system calls gracefully by returning
2068 -ENOSYS. Seccomp sandboxes are affected by this issue.
2070 Changes to build and runtime requirements:
2072 * It is no longer necessary to have recent Linux kernel headers to build
2073 working (non-stub) system call wrappers on all architectures except 64-bit
2074 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
2076 * The ChangeLog file is no longer present in the toplevel directory of the
2077 source tree. ChangeLog files are located in the ChangeLog.old directory as
2078 ChangeLog.N where the highest N has the latest entries.
2080 Security related changes:
2082 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
2083 out-of-bounds write when executed in a signal frame context.
2085 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
2086 environment variable during program execution after a security
2087 transition, allowing local attackers to restrict the possible mapping
2088 addresses for loaded libraries and thus bypass ASLR for a setuid
2089 program. Reported by Marcin Kościelnicki.
2091 The following bugs are resolved with this release:
2093 [12031] localedata: iconv -t ascii//translit with Greek characters
2094 [15813] libc: Multiple issues in __gen_tempname
2095 [17726] libc: [arm, sparc] profil_counter should be compat symbol
2096 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
2097 [19767] libc: vdso is not used with static linking
2098 [19903] hurd: Shared mappings not being inherited by children processes
2099 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
2100 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
2102 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
2103 Symbols-A/B Unicode blocks
2104 [23518] libc: Eliminate __libc_utmp_jump_table
2105 [24026] malloc: malloc_info() returns wrong numbers
2106 [24054] localedata: Many locales are missing date_fmt
2107 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
2108 [24304] dynamic-link: Lazy binding failure during ELF
2109 constructors/destructors is not fatal
2110 [24376] libc: RISC-V symbol size confusion with _start
2111 [24682] localedata: zh_CN first weekday should be Monday per GB/T
2113 [24824] libc: test-in-container does not install charmap files compatible
2115 [24844] regex: regex bad pointer / leakage if malloc fails
2116 [24867] malloc: Unintended malloc_info formatting changes
2117 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
2118 [24880] libc: login: utmp implementation uses struct flock with fcntl64
2119 [24882] libc: login: pututline uses potentially outdated cache
2120 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
2121 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
2123 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
2125 [24930] dynamic-link: dlopen of PIE executable can result in
2126 _dl_allocate_tls_init assertion failure
2127 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
2128 (stringop-overflow error)
2129 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
2130 functions other can lead to crashes
2131 [24967] libc: jemalloc static linking causes runtime failure
2132 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
2134 [25035] libc: sbrk() failure handled poorly in tunables_strdup
2135 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
2136 [25097] libc: new -Warray-bounds with GCC 10
2137 [25112] dynamic-link: dlopen must not make new objects accessible when it
2138 still can fail with an error
2139 [25139] localedata: Please add the new mnw_MM locale
2140 [25149] regex: Array bounds violation in proceed_next_node
2141 [25157] dynamic-link: Audit cookie for the dynamic loader is not
2142 initialized correctly
2143 [25189] libc: glibc's __glibc_has_include causes issues with clang
2145 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
2146 value to an unsigned
2147 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
2148 binaries (CVE-2019-19126)
2149 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
2151 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
2153 [25232] string: <string.h> does not enable const correctness for strchr et
2155 [25233] localedata: Consider "." as the thousands separator for sl_SI
2157 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
2158 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
2159 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
2161 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
2162 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
2164 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
2165 (dl_initfirst) link map pointer
2166 [25401] malloc: pvalloc must not have __attribute_alloc_size__
2167 [25423] libc: Array overflow in backtrace on powerpc
2168 [25425] network: Missing call to __resolv_context_put in
2169 getaddrinfo.c:gethosts
2176 * Unicode 12.1.0 Support: Character encoding, character type info, and
2177 transliteration tables are all updated to Unicode 12.1.0, using
2178 generator scripts contributed by Mike FABIAN (Red Hat).
2180 * The dynamic linker accepts the --preload argument to preload shared
2181 objects, in addition to the LD_PRELOAD environment variable.
2183 * The twalk_r function has been added. It is similar to the existing
2184 twalk function, but it passes an additional caller-supplied argument
2185 to the callback function.
2187 * On Linux, the getdents64, gettid, and tgkill functions have been added.
2189 * Minguo (Republic of China) calendar support has been added as an
2190 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
2193 * The entry for the new Japanese era has been added for ja_JP locale.
2195 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
2196 pvalloc, memalign, and posix_memalign fail now with total object size
2197 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
2198 pointer subtraction within the allocated object, where results might
2199 overflow the ptrdiff_t type.
2201 * The dynamic linker no longer refuses to load objects which reference
2202 versioned symbols whose implementation has moved to a different soname
2203 since the object has been linked. The old error message, symbol
2204 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
2205 link time reference, is gone.
2207 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
2208 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
2209 functions. These behave similarly to their "timed" equivalents, but also
2210 accept a clockid_t parameter to determine which clock their timeout should
2211 be measured against. All functions allow waiting against CLOCK_MONOTONIC
2212 and CLOCK_REALTIME. The decision of which clock to be used is made at the
2213 time of the wait (unlike with pthread_condattr_setclock, which requires
2214 the clock choice at initialization time).
2216 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
2217 work, new resolvers can use a second argument which can be extended in
2218 the future, currently it contains the AT_HWCAP2 value.
2220 Deprecated and removed features, and other changes affecting compatibility:
2222 * The copy_file_range function fails with ENOSYS if the kernel does not
2223 support the system call of the same name. Previously, user space
2224 emulation was performed, but its behavior did not match the kernel
2225 behavior, which was deemed too confusing. Applications which use the
2226 copy_file_range function can no longer rely on glibc to provide a fallback
2227 on kernels that do not support the copy_file_range system call, and if
2228 this function returns ENOSYS, they will need to use their own fallback.
2229 Support for copy_file_range for most architectures was added in version
2230 4.5 of the mainline Linux kernel.
2232 * The functions clock_gettime, clock_getres, clock_settime,
2233 clock_getcpuclockid, clock_nanosleep were removed from the librt library
2234 for new applications (on architectures which had them). Instead, the
2235 definitions in libc will be used automatically, which have been available
2238 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
2239 and <sys/stropts.h> have been removed.
2241 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
2242 resolver flag (deprecated in glibc 2.25) have been removed.
2244 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
2245 resolver have been removed from <resolv.h>.
2247 * With --enable-bind-now, installed programs are now linked with the
2250 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
2251 configurations) has been removed, following the deprecation of this
2252 subarchitecture in version 8 of GCC, and its removal in version 9.
2254 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2255 header have been removed.
2257 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2258 deprecated and will be removed from a future version of glibc.
2259 Application should directly access /proc instead. For obtaining random
2260 bits, the getentropy function can be used.
2262 Changes to build and runtime requirements:
2264 * GCC 6.2 or later is required to build the GNU C Library.
2266 Older GCC versions and non-GNU compilers are still supported when
2267 compiling programs that use the GNU C Library.
2269 Security related changes:
2271 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2272 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2273 has undefined behavior. On x32, the size_t argument may be passed
2274 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2275 32 bits. When it happened with the sign bit of RDX register set,
2276 memcmp gave the wrong result since it treated the size argument as
2277 zero. Reported by H.J. Lu.
2279 CVE-2019-9169: Attempted case-insensitive regular-expression match
2280 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2281 over-read. Reported by Hongxu Chen.
2283 The following bugs are resolved with this release:
2285 [2872] locale: Transliteration Cyrillic -> ASCII fails
2286 [6399] libc: gettid() should have a wrapper
2287 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2288 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2289 [17396] localedata: globbing for locale by [[.collating-element.]]
2290 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2291 [18465] malloc: memusagestat is built using system C library
2292 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2293 invalid input drops valid char
2294 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2295 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2296 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2297 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2298 [23352] malloc: __malloc_check_init still defined in public header
2300 [23403] nptl: Wrong alignment of TLS variables
2301 [23501] libc: nftw() doesn't return dangling symlink's inode
2302 [23733] malloc: Check the count before calling tcache_get()
2303 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2305 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2306 [23844] nptl: pthread_rwlock_trywrlock results in hang
2307 [23983] argparse: Missing compat versions of argp_failure and argp_error
2308 for long double = double
2309 [23984] libc: Missing compat versions of err.h and error.h functions for
2310 long double = double
2311 [23996] localedata: Dutch salutations
2312 [24040] libc: riscv64: unterminated call chain in __thread_start
2313 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2315 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2316 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2318 [24114] regex: regexec buffer read overrun in "grep -i
2319 '\(\(\)*.\)*\(\)\(\)\1'"
2320 [24122] libc: Segfaults if 0 returned from la_version
2321 [24153] stdio: Some input functions do not react to stdin assignment
2322 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2323 RDX is set) (CVE-2019-7309)
2324 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2325 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2326 not the default "nor"
2327 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2328 false positives, change to modern flexible array
2329 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2330 instructions while maintaining the robust mutex list due to missing
2332 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2333 unnecessary librt dependencies
2334 [24200] localedata: Revert first_weekday removal in en_IE locale
2335 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2336 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2337 [24216] malloc: Check for large bin list corruption when inserting
2339 [24228] stdio: old x86 applications that use legacy libio crash on exit
2340 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2342 [24293] localedata: Missing Minguo calendar support for TW locales
2343 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2344 tt_RU (Tatar) locale
2345 [24307] localedata: Update locale data to Unicode 12.0.0
2346 [24323] dynamic-link: dlopen should not be able open PIE objects
2347 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2348 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2349 tt_RU (Tatar) locale
2350 [24370] localedata: Add lang_name for tt_RU locale
2351 [24372] locale: Binary locale files are not architecture independent
2352 [24394] time: strptime %Ey mis-parses final year of era
2353 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2355 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2357 [24531] malloc: Malloc tunables give tcache assertion failures
2358 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2360 [24535] localedata: Update locale data to Unicode 12.1.0
2361 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2362 kernels and break testing
2363 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2364 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2365 [-Werror=format-overflow=]
2366 [24570] libc: alpha: compat msgctl uses __IPC_64
2367 [24584] locale: Data race in __wcsmbs_clone_conv
2368 [24588] stdio: Remove codecvt vtables from libio
2369 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2371 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2372 [24632] stdio: Old binaries which use freopen with default stdio handles
2374 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2376 [24652] localedata: szl_PL spelling correction
2377 [24695] nss: nss_db: calling getpwent after endpwent crashes
2378 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2379 in /etc/nsswitch.conf
2380 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2381 [24740] libc: getdents64 type confusion
2382 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2383 always implemented in the same library
2384 [24744] libc: Remove copy_file_range emulation
2385 [24757] malloc: memusagestat is linked against system libpthread
2386 [24794] libc: Partial test suite run builds corrupt test-in-container
2394 * The getcpu wrapper function has been added, which returns the currently
2395 used CPU and NUMA node. This function is Linux-specific.
2397 * A new convenience target has been added for distribution maintainers
2398 to build and install all locales as directories with files. The new
2399 target is run by issuing the following command in your build tree:
2400 'make localedata/install-locale-files', with an optional DESTDIR
2401 to set the install root if you wish to install into a non-default
2402 configured location.
2404 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2406 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2407 for _GNU_SOURCE, to match BSD environments.
2409 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2410 indicates that it will abort the transaction prior to entering the kernel
2411 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2412 suspended, and this caused some undefined side-effects issues by aborting
2413 transactions manually. Glibc avoided it by abort transactions manually on
2414 each syscall, but it lead to performance issues on newer kernels where the
2415 HTM state is saved and restore lazily (the state being saved even when the
2416 process actually does not use HTM).
2418 * The functions posix_spawn_file_actions_addchdir_np and
2419 posix_spawn_file_actions_addfchdir_np have been added, enabling
2420 posix_spawn and posix_spawnp to run the new process in a different
2421 directory. These functions are GNU extensions. The function
2422 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2425 * The popen and system do not run atfork handlers anymore (BZ#17490).
2426 Although it is a possible POSIX violation, the POSIX rationale in
2427 pthread_atfork documentation regarding atfork handlers is to handle
2428 inconsistent mutex state after a fork call in a multi-threaded process.
2429 In both popen and system there is no direct access to user-defined mutexes.
2431 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2432 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2434 - C-SKY ABIV2 soft-float little-endian
2435 - C-SKY ABIV2 hard-float little-endian
2437 * strftime's default formatting of a locale's alternative year (%Ey)
2438 has been changed to zero-pad the year to a minimum of two digits,
2439 like "%y". This improves the display of Japanese era years during
2440 the first nine years of a new era, and is expected to be harmless
2441 for all other locales (only Japanese locales regularly have
2442 alternative year numbers less than 10). Zero-padding can be
2443 overridden with the '_' or '-' flags (which are GNU extensions).
2445 * As a GNU extension, the '_' and '-' flags can now be applied to
2446 "%EY" to control how the year number is formatted; they have the
2447 same effect that they would on "%Ey".
2449 Deprecated and removed features, and other changes affecting compatibility:
2451 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2452 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2454 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2455 in <sys/procfs.h>, has been corrected to match the type actually used by
2456 the Linux kernel. This affects the size and layout of that structure on
2457 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2459 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2460 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2461 defined in <sys/procfs.h>, has been corrected to match the type actually
2462 used by the Linux kernel. This affects the size and layout of those
2465 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2466 meant to scan a string and allocate space for it with malloc, is now
2467 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2468 defined. This extension conflicts with C99's use of '%a' to scan a
2469 hexadecimal floating-point number, which is now available to programs
2470 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2472 POSIX.1-2008 includes the feature of allocating a buffer for string input
2473 with malloc, using the modifier letter 'm' instead. Programs using
2474 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2475 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2476 C99 '%a' no longer need to avoid _GNU_SOURCE.
2478 GCC's -Wformat warnings can detect most uses of this extension, as long
2479 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2480 __attribute__ ((format (scanf, ...))).
2482 Changes to build and runtime requirements:
2484 * Python 3.4 or later is required to build the GNU C Library.
2486 * On most architectures, GCC 5 or later is required to build the GNU C
2487 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2489 Older GCC versions and non-GNU compilers are still supported when
2490 compiling programs that use the GNU C Library.
2492 Security related changes:
2494 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2495 denial of service due to resource exhaustion when processing getaddrinfo
2496 calls with crafted host names. Reported by Guido Vranken.
2498 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2499 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2500 happened, accessing the 32-bit size_t value as the full 64-bit register
2501 in the assembly string/memory functions would cause a buffer overflow.
2502 Reported by H.J. Lu.
2504 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2505 addresses with arbitrary trailing characters, potentially leading to data
2506 or command injection issues in applications.
2508 The following bugs are resolved with this release:
2510 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2511 [10496] localedata: 12h time representation in multiple locales faulty
2512 [10797] localedata: it_IT locale numeric does not have a separator for
2514 [11319] libc: dprintf doesn't handle errors properly
2515 [16346] time: mktime: potentially unsafe use of localtime_offset
2516 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2518 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2519 posix_spawn_file_actions_addfchdir_np
2520 [17426] localedata: Indian locales: set the correct date format
2521 [17490] stdio: popen should not invoke atfork handlers
2522 [17783] libc: TIOCSER_TEMT conditions inconsistent
2523 [18040] regex: use-after-free in regexec/get_subexp
2524 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2525 [20018] network: getaddrinfo should reject IP addresses with trailing
2526 characters (CVE-2016-10739)
2527 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2528 [20271] libc: Missing "\n" in __libc_fatal calls
2529 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2530 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2531 pointer argument is non-NULL
2532 [21037] stdio: open_memstream and freopen
2533 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2534 [21716] time: Crash in glibc's mktime in low-memory situations
2535 [22834] stdio: Subprocess forked by popen may crash in Linux when
2536 multithreads call popen
2537 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2538 and pthread_create fails.
2539 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2540 [23125] libc: riscv64: endless loop when throwing an exception from a
2542 [23275] nptl: Race in pthread_mutex_lock while promoting to
2543 PTHREAD_MUTEX_ELISION_NP.
2544 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2546 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2548 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2550 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2551 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2553 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2554 [23521] nss: get_next_alias nss_files file stream leak
2555 [23538] nptl: Hang in pthread_cond_broadcast
2556 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2557 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2558 [23579] libc: Errors misreported in preadv2
2559 [23597] build: support/test-container.c doesn't work with different
2561 [23603] time: mktime signed integer overflow on large timestamps
2562 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2563 [23614] libc: powerpc: missing CFI register information in __mpn_*
2565 [23637] string: Generic strstr/strcasestr fails with huge needles
2566 [23640] libc: no way to easily clear FD_CLOEXEC in
2567 posix_spawn_file_actions_adddup2()
2568 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2570 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2572 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2573 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2574 bits/types/struct_rusage.h
2575 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2577 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2579 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2580 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2581 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2583 [23724] localedata: Albanian date formats are incorrect
2584 [23735] math: libnldbl_nonshared.a references internal libm symbols
2585 [23740] localedata: kl_GL: Month names and date formats need update
2586 [23744] regex: regex refactorings to remove BE, avoid duplication
2587 [23745] time: mktime fix for Gnulib + coreutils
2588 [23758] time: Improve the width of alternate representation for year in
2590 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2591 [23789] time: mktime does not set errno on failure
2592 [23791] localedata: Wrong monetary format for ca_ES locale
2593 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2594 [23794] locale: c16rtomb does not handle surrogate pairs
2595 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2596 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2597 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2598 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2599 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2600 [23862] libc: [sh] missing kernel-features.h undefines
2601 [23864] libc: [riscv] missing kernel-features.h undefines
2602 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2603 [23907] malloc: Incorrect double-free malloc tcache check disregards
2605 [23913] libc: off-by-one in function maybe_script_execute in
2606 sysdeps/posix/spawni.c
2607 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2608 [23923] locale: Add --no-hard-links option to localedef
2609 [23927] network: Linux if_nametoindex() does not close descriptor
2611 [23961] math: powf can overflow to inf without setting errno in non-
2612 nearest rounding mode
2613 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2614 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2615 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2616 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2617 [24011] localedata: Fixed small type in comment for locale bs_BA
2618 [24018] libc: gettext() may return NULL
2619 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2620 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2621 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2623 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2624 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2626 [24046] localedata: en_US locale doesn't define date_fmt
2627 [24063] manual: @var{errno} should be @code{errno}
2628 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2629 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2631 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2633 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2635 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2637 [24112] network: Do not send DNS queries for non-host names (where all
2638 answers will be rejected)
2639 [24130] libc: alpha __remqu corrupts $f3 register
2646 * The localization data for ISO 14651 is updated to match the 2016
2647 Edition 4 release of the standard, this matches data provided by
2648 Unicode 9.0.0. This update introduces significant improvements to the
2649 collation of Unicode characters. This release deviates slightly from
2650 the standard in that the collation element ordering for lowercase and
2651 uppercase LATIN script characters is adjusted to ensure that regular
2652 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2653 is not matched by [a-z]. With the update many locales have been
2654 updated to take advantage of the new collation information. The new
2655 collation information has increased the size of the compiled locale
2656 archive or binary locales.
2658 * The GNU C Library can now be compiled with support for Intel CET, AKA
2659 Intel Control-flow Enforcement Technology. When the library is built
2660 with --enable-cet, the resulting glibc is protected with indirect
2661 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2662 compatible with all existing executables and shared libraries. This
2663 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2664 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2665 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2666 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2667 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2668 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2671 * The GNU C Library now has correct support for ABSOLUTE symbols
2672 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2673 relocated incorrectly or in some cases discarded. The GNU linker can
2674 make use of the newer semantics, but it must communicate it to the
2675 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2676 field) to indicate such support is required.
2678 * Unicode 11.0.0 Support: Character encoding, character type info, and
2679 transliteration tables are all updated to Unicode 11.0.0, using
2680 generator scripts contributed by Mike FABIAN (Red Hat).
2682 * <math.h> functions that round their results to a narrower type are added
2683 from TS 18661-1:2014 and TS 18661-3:2015:
2685 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2686 fMxaddfNx functions.
2688 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2689 fMxsubfNx functions.
2691 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2692 fMxmulfNx functions.
2694 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2695 fMxdivfNx functions.
2697 * Two grammatical forms of month names are now supported for the following
2698 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2699 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2700 support two grammatical forms in abbreviated month names: Catalan, Greek,
2703 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2704 include the support for two grammatical forms of month names.
2706 * Building and running on GNU/Hurd systems now works without out-of-tree
2709 * The renameat2 function has been added, a variant of the renameat function
2710 which has a flags argument. If the flags are zero, the renameat2 function
2711 acts like renameat. If the flag is not zero and there is no kernel
2712 support for renameat2, the function will fail with an errno value of
2713 EINVAL. This is different from the existing gnulib function renameatu,
2714 which performs a plain rename operation in case of a RENAME_NOREPLACE
2715 flags and a non-existing destination (and therefore has a race condition
2716 that can clobber the destination inadvertently).
2718 * The statx function has been added, a variant of the fstatat64
2719 function with an additional flags argument. If there is no direct
2720 kernel support for statx, glibc provides basic stat support based on
2721 the fstatat64 function.
2723 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2724 library if installed. libidn2 version 2.0.5 or later is recommended. If
2725 libidn2 is not available, internationalized domain names are not encoded
2726 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2727 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2728 with an encoding error.) Flags which used to change the IDN encoding and
2729 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2730 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2731 deprecated. They no longer have any effect.
2733 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2734 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2735 range of ELF gABI expressions including such constructs as
2736 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2737 have been further restricted, and where in the past a dynamic string
2738 token sequence may have been interpreted as a literal string it will
2739 now cause a load failure. These load failures were always considered
2740 unspecified behaviour from the perspective of the dynamic loader, and
2741 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2742 results in a load failure now.
2744 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2745 implementation includes all the standard functions provided by
2748 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2749 thrd_detach, thrd_exit, and thrd_join for thread management.
2751 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2752 mtx_destroy for mutual exclusion.
2754 - call_once for function call synchronization.
2756 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2757 cnd_wait for conditional variables.
2759 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2761 Application developers must link against libpthread to use ISO C threads.
2763 Deprecated and removed features, and other changes affecting compatibility:
2765 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2766 installed. Software that was using either header should be updated to
2767 use standard <stdio.h> interfaces instead.
2769 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2770 This was never required by the C standard, and the macros just expanded
2771 to call alternative names for the same functions. If you hoped getc and
2772 putc would provide performance improvements over fgetc and fputc, instead
2773 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2774 necessary, flockfile and funlockfile.
2776 * All stdio functions now treat end-of-file as a sticky condition. If you
2777 read from a file until EOF, and then the file is enlarged by another
2778 process, you must call clearerr or another function with the same effect
2779 (e.g. fseek, rewind) before you can read the additional data. This
2780 corrects a longstanding C99 conformance bug. It is most likely to affect
2781 programs that use stdio to read interactive input from a terminal.
2784 * The macros 'major', 'minor', and 'makedev' are now only available from
2785 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2786 headers that happen to include <sys/types.h>. These macros are rarely
2787 used, not part of POSIX nor XSI, and their names frequently collide with
2788 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2789 further explanation.
2791 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2792 these macros should first include <sys/types.h>, and then include
2793 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2795 * The tilegx*-*-linux-gnu configurations are no longer supported.
2797 * The obsolete function ustat is no longer available to newly linked
2798 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2799 function has been deprecated in favor of fstatfs and statfs.
2801 * The obsolete function nfsservctl is no longer available to newly linked
2802 binaries. This function was specific to systems using the Linux kernel
2803 and could not usefully be used with the GNU C Library on systems with
2804 version 3.1 or later of the Linux kernel.
2806 * The obsolete function name llseek is no longer available to newly linked
2807 binaries. This function was specific to systems using the Linux kernel
2808 and was not declared in a header. Programs should use the lseek64 name
2809 for this function instead.
2811 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2812 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2813 previously selected by them is now always enabled.
2815 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2816 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2817 restriction (rejecting '_' in host names, among other things) has been
2818 removed, for increased compatibility with non-IDN name resolution.
2820 * The fcntl function now have a Long File Support variant named fcntl64. It
2821 is added to fix some Linux Open File Description (OFD) locks usage on non
2822 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2823 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2824 locks act as a cancellation entrypoint.
2826 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2827 ecb_crypt, and des_setparity are no longer available to newly linked
2828 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2829 longer installed. These functions encrypted and decrypted data with the
2830 DES block cipher, which is no longer considered secure. Software that
2831 still uses these functions should switch to a modern cryptography library,
2834 * Reflecting the removal of the encrypt and setkey functions above, the
2835 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2836 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2839 * The obsolete function fcrypt is no longer available to newly linked
2840 binaries. It was just another name for the standard function crypt,
2841 and it has not appeared in any header file in many years.
2843 * We have tentative plans to hand off maintenance of the passphrase-hashing
2844 library, libcrypt, to a separate development project that will, we hope,
2845 keep up better with new passphrase-hashing algorithms. We will continue
2846 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2847 'crypt_r' should not need to change at all; however, distributions will
2848 need to install <crypt.h> and libcrypt from a separate project.
2850 In this release, if the configure option --disable-crypt is used, glibc
2851 will not install <crypt.h> or libcrypt, making room for the separate
2852 project's versions of these files. The plan is to make this the default
2853 behavior in a future release.
2855 Changes to build and runtime requirements:
2857 GNU make 4.0 or later is now required to build glibc.
2859 Security related changes:
2861 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2862 been fixed by removing the glibc-internal IDNA implementation and using
2863 the system-provided libidn2 library instead. Originally reported by Hanno
2864 Böck and Christian Weisgerber.
2866 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2867 architecture could corrupt memory. Reported by Max Horn.
2869 CVE-2018-11236: Very long pathname arguments to realpath function could
2870 result in an integer overflow and buffer overflow. Reported by Alexey
2873 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2874 architecture could write beyond the target buffer, resulting in a buffer
2875 overflow. Reported by Andreas Schwab.
2877 The following bugs are resolved with this release:
2879 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2880 [6889] manual: 'PWD' mentioned but not specified
2881 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2882 when __WORDSIZE != 64
2883 [13762] regex: re_search etc. should return -2 on memory exhaustion
2884 [13888] build: /tmp usage during testing
2885 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2886 [14092] nptl: Support C11 threads
2887 [14095] localedata: Review / update collation data from Unicode / ISO
2889 [14508] libc: -Wformat warnings
2890 [14553] libc: Namespace pollution loff_t in sys/types.h
2891 [14890] libc: Make NT_PRFPREG canonical.
2892 [15105] libc: Extra PLT references with -Os
2893 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2895 [16335] manual: Feature test macro documentation incomplete and out of
2897 [16552] libc: Unify umount implementations in terms of umount2
2898 [17082] libc: htons et al.: statement-expressions prevent use on global
2899 scope with -O1 and higher
2900 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2901 [17438] localedata: pt_BR: wrong d_fmt delimiter
2902 [17662] libc: please implement binding for the new renameat2 syscall
2903 [17721] libc: __restrict defined as /* Ignore */ even in c11
2904 [17979] libc: inconsistency between uchar.h and stdint.h
2905 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2906 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2907 horrible machine code)
2908 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2910 [18471] libc: llseek should be a compat symbol
2911 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2913 [18991] nss: nss_files skips large entry in database
2914 [19239] libc: Including stdlib.h ends up with macros major and minor being
2916 [19463] libc: linknamespace failures when compiled with -Os
2917 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2918 [19527] locale: Normalized charset name not recognized by setlocale
2919 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2920 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2922 [19728] network: out of bounds stack read in libidn function
2923 idna_to_ascii_4i (CVE-2016-6261)
2924 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2925 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2926 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2928 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2929 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2930 [20419] dynamic-link: files with large allocated notes crash in
2932 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2933 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2934 [20980] manual: CFLAGS environment variable replaces vital options
2935 [21163] regex: Assertion failure in pop_fail_stack when executing a
2936 malformed regexp (CVE-2015-8985)
2937 [21234] manual: use of CFLAGS makes glibc detect no optimization
2938 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2939 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2940 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2941 [21508] locale: intl/tst-gettext failure with latest msgfmt
2942 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2943 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2944 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2946 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2948 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2949 [22247] network: Integer overflow in the decode_digit function in
2950 puny_decode.c in libidn (CVE-2017-14062)
2951 [22342] nscd: NSCD not properly caching netgroup
2952 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2953 [22550] localedata: es_ES locale (and other es_* locales): collation
2954 should treat ñ as a primary different character, sync the collation
2955 for Spanish with CLDR
2956 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2957 by gcc configured with --enable-default-pie
2958 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2959 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2960 crossing 2GB threshold (CVE-2017-18269)
2961 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2963 [22735] time: Misleading typo in time.h source comment regarding
2965 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2966 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2967 `__assert_perror_fail ()' to `__assert_fail_base ()'
2968 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2970 [22786] libc: Stack buffer overflow in realpath() if input size is close
2971 to SSIZE_MAX (CVE-2018-11236)
2972 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2973 through an absolute DT_NEEDED path
2974 [22792] build: tcb-offsets.h dependency dropped
2975 [22797] libc: pkey_get() uses non-reserved name of argument
2976 [22807] libc: PTRACE_* constants missing for powerpc
2977 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2978 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2979 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2980 [22848] localedata: ca_ES: update date definitions from CLDR
2981 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2982 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2983 [22896] localedata: Update locale data for an_ES
2984 [22902] math: float128 test failures with GCC 8
2985 [22918] libc: multiple common of `__nss_shadow_database'
2986 [22919] libc: sparc32: backtrace yields infinite backtrace with
2988 [22926] libc: FTBFS on powerpcspe
2989 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2991 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2992 [22947] libc: FAIL: misc/tst-preadvwritev2
2993 [22963] localedata: cs_CZ: Add alternative month names
2994 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2995 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2996 [22998] dynamic-link: execstack tests are disabled when SELinux is
2998 [23005] network: Crash in __res_context_send after memory allocation
3000 [23007] math: strtod cannot handle -nan
3001 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
3002 [23036] regex: regex equivalence class regression
3003 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
3004 [23069] libc: sigaction broken on riscv64-linux-gnu
3005 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
3006 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
3007 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
3008 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
3009 and libc build with -Os)
3010 [23140] localedata: More languages need two forms of month names
3011 [23145] libc: _init/_fini aren't marked as hidden
3012 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
3013 [23171] math: C++ iseqsig for long double converts arguments to double
3014 [23178] nscd: sudo will fail when it is run in concurrent with commands
3015 that changes /etc/passwd
3016 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
3018 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
3019 [23208] localedata: New locale - Lower Sorbian (dsb)
3020 [23233] regex: Memory leak in build_charclass_op function in file
3022 [23236] stdio: Harden function pointers in _IO_str_fields
3023 [23250] nptl: Offset of __private_ss differs from GCC
3024 [23253] math: tgamma test suite failures on i686 with -march=x86-64
3025 -mtune=generic -mfpmath=sse
3026 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
3028 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
3029 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
3031 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
3032 [23277] math: nan function should not have const attribute
3033 [23279] math: scanf and strtod wrong for some hex floating-point
3034 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
3036 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
3037 [23303] build: undefined reference to symbol
3038 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
3039 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
3041 [23313] stdio: libio vtables validation and standard file object
3043 [23329] libc: The __libc_freeres infrastructure is not properly run across
3045 [23349] libc: Various glibc headers no longer compatible with
3047 [23351] malloc: Remove unused code related to heap dumps and malloc
3049 [23363] stdio: stdio-common/tst-printf.c has non-free license
3050 [23396] regex: Regex equivalence regression in single-byte locales
3051 [23422] localedata: oc_FR: More updates of locale data
3052 [23442] build: New warning with GCC 8
3053 [23448] libc: Out of bounds access in IBM-1390 converter
3054 [23456] libc: Wrong index_cpu_LZCNT
3055 [23458] build: tst-get-cpu-features-static isn't added to tests
3056 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
3058 [23467] dynamic-link: x86/CET: A property note parser bug
3065 * The GNU C Library can now be compiled with support for building static
3066 PIE executables (See --enable-static-pie in INSTALL). These static PIE
3067 executables are like static executables but can be loaded at any address
3068 and provide additional security hardening benefits at the cost of some
3069 memory and performance. When the library is built with --enable-static-pie
3070 the resulting libc.a is usable with GCC 8 and above to create static PIE
3071 executables using the GCC option '-static-pie'. This feature is currently
3072 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
3073 aarch64 with binutils 2.30 or later.
3075 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
3076 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
3079 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
3081 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
3083 * In order to support faster and safer process termination the malloc API
3084 family of functions will no longer print a failure address and stack
3085 backtrace after detecting heap corruption. The goal is to minimize the
3086 amount of work done after corruption is detected and to avoid potential
3087 security issues in continued process execution. Reducing shutdown time
3088 leads to lower overall process restart latency, so there is benefit both
3089 from a security and performance perspective.
3091 * The abort function terminates the process immediately, without flushing
3092 stdio streams. Previous glibc versions used to flush streams, resulting
3093 in deadlocks and further data corruption. This change also affects
3094 process aborts as the result of assertion failures.
3096 * On platforms where long double has the IEEE binary128 format (aarch64,
3097 alpha, mips64, riscv, s390 and sparc), the math library now implements
3098 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
3099 These are the same interfaces added in version 2.26 for some platforms where
3100 this format is supported but is not the format of long double.
3102 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
3103 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
3104 implements interfaces for that type, as defined by ISO/IEC TS
3105 18661-3:2015. These are corresponding interfaces to those supported for
3108 * The math library now implements interfaces for the _Float32, _Float64 and
3109 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
3110 corresponding interfaces to those supported for _Float128.
3112 * glibc now implements the memfd_create and mlock2 functions on Linux.
3114 * Support for memory protection keys was added. The <sys/mman.h> header now
3115 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
3118 * The copy_file_range function was added.
3120 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
3122 * The ldconfig utility now processes `include' directives using the C/POSIX
3123 collation ordering. Previous glibc versions used locale-specific
3124 ordering, the change might break systems that relied on that.
3126 * Support for two grammatical forms of month names has been added.
3127 In a call to strftime, the "%B" and "%b" format specifiers will now
3128 produce the grammatical form required when the month is used as part
3129 of a complete date. New "%OB" and "%Ob" specifiers produce the form
3130 required when the month is named by itself. For instance, in Greek
3131 and in many Slavic and Baltic languages, "%B" will produce the month
3132 in genitive case, and "%OB" will produce the month in nominative case.
3134 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
3135 are all valid and will all accept any known form of month
3136 name---standalone or complete, abbreviated or full. In a call to
3137 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
3138 the strings used by "%B" and "%b", respectively. New query
3139 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
3140 used by "%OB" and "%Ob", respectively.
3142 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
3143 define the strings for %OB and %Ob, respectively; these have the
3144 same syntax as "mon" and "abmon". These arrays are optional; if they
3145 are not provided then they have the same content as "mon" and "abmon",
3148 These features are provided for locales which define "alt_mon" and/or
3149 "ab_alt_mon" in their locale source data. This release includes such
3150 alternative month name data for the following languages: Belarusian,
3151 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
3153 This feature is currently a GNU extension, but it is expected to
3154 be added to the next revision of POSIX, and it is also already
3155 available on some BSD-derived operating systems.
3157 This feature will cause existing statically compiled applications
3158 to fail to load locales and fall back to the builtin C/POSIX locales.
3159 See notes below for other changes affecting compatibility.
3161 * Support for the RISC-V ISA running on Linux has been added. This port
3162 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
3163 for the following ISA and ABI pairs:
3169 Deprecated and removed features, and other changes affecting compatibility:
3171 * Statically compiled applications attempting to load locales compiled for the
3172 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
3173 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
3174 support for two grammatical forms of the month names, also extends the locale
3175 data binary format. Static applications needing locale support must be
3176 recompiled to match the runtime and data they are deployed with. In some
3177 distributions there is an upgrade window where dynamically linked applications
3178 may use a new library but the old locale data and also fall back to the
3179 builtin C/POSIX locales; restarting the application process is sufficient to
3182 * Support for statically linked applications which call dlopen is deprecated
3183 and will be removed in a future version of glibc. Applications which call
3184 dlopen need to be linked dynamically instead.
3186 * Support for old programs which use internal stdio data structures and
3187 functions is deprecated. This includes programs which use the C++ streams
3188 provided by libstdc++ in GCC 2.95. Programs which use the internal
3189 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
3190 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
3191 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
3192 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
3193 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
3194 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
3195 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
3196 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
3197 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
3198 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
3199 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
3200 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
3201 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
3202 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
3203 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
3204 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
3205 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
3206 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
3207 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
3208 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
3209 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
3210 future version of glibc. Unlike other symbol removals, these old
3211 applications will not be supported using compatibility symbols.
3213 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
3214 defined by <sys/ptrace.h>.
3216 * libm no longer supports SVID error handling (calling a user-provided
3217 matherr function on error) or the _LIB_VERSION variable to control error
3218 handling. (SVID error handling and the _LIB_VERSION variable still work
3219 for binaries linked against older versions of the GNU C Library.) The
3220 libieee.a library is no longer provided. math.h no longer defines struct
3221 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
3222 TLOSS, PLOSS and HUGE.
3224 * The libm functions pow10, pow10f and pow10l are no longer supported for
3225 new programs. Programs should use the standard names exp10, exp10f and
3226 exp10l for these functions instead.
3228 * The mcontext_t type is no longer the same as struct sigcontext. On
3229 platforms where it was previously the same, this changes the C++ name
3230 mangling for interfaces involving this type.
3232 * The add-ons mechanism for building additional packages at the same time as
3233 glibc has been removed. The --enable-add-ons configure option is now
3236 * The --without-fp configure option is now ignored. Whether hardware
3237 floating-point instructions are used is now configured based on whether
3238 the compiler used at configure time (without any options implied by a
3239 --with-cpu= configure option) uses such instructions.
3241 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
3242 the specified string can be parsed as a domain name.
3244 * In the malloc_info output, the <heap> element may contain another <aspace>
3245 element, "subheaps", which contains the number of sub-heaps.
3247 * The libresolv function p_secstodate is no longer supported for new
3250 * The tilepro-*-linux-gnu configuration is no longer supported.
3252 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3253 and will be removed in a future release. Software that is still using
3254 either header should be updated to use standard <stdio.h> interfaces
3257 libio.h was originally the header for a set of supported GNU extensions,
3258 but they have not been maintained as such in many years, they are now
3259 standing in the way of improvements to stdio, and we don't think there are
3260 any remaining external users. _G_config.h was never intended for public
3261 use, but predates the bits convention.
3263 Changes to build and runtime requirements:
3265 * bison version 2.7 or later is required to generate code in the 'intl'
3268 Security related changes:
3270 CVE-2009-5064: The ldd script would sometimes run the program under
3271 examination directly, without preventing code execution through the
3272 dynamic linker. (The glibc project disputes that this is a security
3273 vulnerability; only trusted binaries must be examined using the ldd
3276 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3277 suffered from a one-byte overflow during ~ operator processing (either
3278 on the stack or the heap, depending on the length of the user name).
3279 Reported by Tim Rühsen.
3281 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3282 would sometimes fail to free memory allocated during ~ operator
3283 processing, leading to a memory leak and, potentially, to a denial
3286 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3287 without GLOB_NOESCAPE, could write past the end of a buffer while
3288 unescaping user names. Reported by Tim Rühsen.
3290 CVE-2017-17426: The malloc function, when called with an object size near
3291 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3292 instead of NULL. This was a regression introduced with the new malloc
3293 thread cache in glibc 2.26. Reported by Iain Buclaw.
3295 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3296 to the allocation of too much memory. (This is not a security bug per se,
3297 it is mentioned here only because of the CVE assignment.) Reported by
3300 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3301 of the number of search path components. (This is not a security
3302 vulnerability per se because no trust boundary is crossed if the fix for
3303 CVE-2017-1000366 has been applied, but it is mentioned here only because
3304 of the CVE assignment.) Reported by Qualys.
3306 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3307 for AT_SECURE or SUID binaries could be used to load libraries from the
3310 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3311 succeeds without returning an absolute path due to unexpected behaviour
3312 of the Linux kernel getcwd syscall. Reported by halfdog.
3314 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3315 an object size near the value of SIZE_MAX, would return a pointer to a
3316 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3318 CVE-2018-6551: The malloc function, when called with an object size near
3319 the value of SIZE_MAX, would return a pointer to a buffer which is too
3320 small, instead of NULL.
3322 The following bugs are resolved with this release:
3324 [866] glob: glob should match dangling symlinks
3325 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3326 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3328 [5997] math: Very slow execution of sinf function
3329 [10580] localedata: hr_HR: updated locale
3330 [10871] locale: 'mon' array should contain both nominative and genitive
3332 [12349] localedata: eu_ES: incorrect thousands separator
3333 [13605] localedata: shn_MM: new Shan locale
3334 [13805] localedata: ru_RU: currency should use ',' as radix point
3335 [13953] localedata: km_KH: locale update
3336 [13994] localedata: mjw_IN: new locale
3337 [14121] build: make writes .mo files in po directory
3338 [14333] libc: Fix the race between atexit() and exit()
3339 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3340 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3342 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3343 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3344 width Latin characters
3345 [15332] localedata: es_CU: locale update
3346 [15436] stdio: Don't close or flush stdio streams on abort
3347 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3349 [16148] localedata: ca_ES: incorrect thousands separator
3350 [16750] dynamic-link: ldd should not try to execute the binaries
3352 [16777] localedata: pl_PL: incorrect thousands separator in locale
3353 [16905] localedata: hanzi: new collation
3354 [17563] localedata: cmn_TW: add hanzi collation
3355 [17750] localedata: wrong collation order of diacritics in most locales
3356 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3358 [17956] build: Build fails on missing definitions from header file
3359 nss/nss.h when Mozilla NSS is used for cryptography
3360 [18203] libc: realpath() does not handle unreachable paths correctly
3361 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3362 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3363 [18822] libc: Internal functions are called via PLT
3364 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3365 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3366 [19574] libc: glibc should support building static PIE binaries
3367 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3369 [19971] glob: glob: Do not skip entries with zero d_ino values
3370 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3371 [20008] localedata: km_KH: convert to translit_neutral
3372 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3373 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3374 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3375 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3376 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3378 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3379 they're set, wrong errors returned by gaih_inet when lookup functions
3381 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3382 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3384 [20952] localedata: yuw_PG: new locale
3385 [21084] localedata: charmaps/IBM858: new codepage
3386 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3387 [21242] libc: assert gives pedantic warning in old gcc versions
3388 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3389 __regcall calling convention
3390 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3391 [21326] libc: C99 functions are not declared for C++11 and later if
3392 _GNU_SOURCE is not predefined by g++
3393 [21457] libc: sys/ucontext.h namespace
3394 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3395 [21660] math: GCC fails to compile a formula with tgmath.h
3396 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3397 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3398 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3399 [21684] math: tgmath.h handling of complex integers
3400 [21685] math: tgmath.h handling of bit-fields
3401 [21686] math: tgmath.h handling of __int128
3402 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3404 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3406 [21750] localedata: column width of characters incompatible with classical
3408 [21754] malloc: malloc: Perform as little work as possible after heap
3409 consistency check failures
3410 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3411 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3412 [21791] string: Unused XXX_chk_XXX functions in libc.a
3413 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3415 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3417 [21845] localedata: Added new Locale bho_NP
3418 [21853] localedata: Fix abday Which looks same as day in zh_SG
3419 [21854] localedata: Added New Locale en_SC
3420 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3421 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3422 _dl_runtime_resolve_avx_slow
3423 [21885] network: getaddrinfo: gethosts does not release resolver context
3424 on memory allocation failure
3425 [21899] libc: XPG4.2 sigaction namespace
3426 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3428 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3430 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3431 errno value, causing getaddrinfo to fail
3432 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3433 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3434 instead of EAI_NODATA
3435 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3436 constant PTRACE_SEIZE_DEVEL
3437 [21930] math: C-only gcc builtins used in <math.h> isinf
3438 [21932] network: Unpaired __resolv_context_get in generic get*_r
3440 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3441 [21944] libc: sigval namespace
3442 [21951] localedata: Update hanzi collation by stroke
3443 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3444 sysdeps/x86_64/fpu/e_expf.S
3445 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3446 allocation in syscall loops)
3447 [21959] localedata: Fix Country name for xh_ZA
3448 [21960] localedata: Fix abmon for bem_ZM
3449 [21966] math: AVX2 mathvec functions use FMA without checking
3450 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3451 [21971] localedata: Added New Locale for mfe_MU
3452 [21972] libc: assert macro requires operator== (int) for its argument type
3453 [21973] math: [sparc] libm missing sqrtl compat symbol
3454 [21974] libc: Remove __bb_init_func and __bb_exit_func
3455 [21982] string: stratcliff.c: error: assuming signed overflow does not
3457 [21986] stdio: __guess_grouping is called incorrectly
3458 [21987] math: [sparc32] wrong bits/long-double.h installed
3459 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3461 [22022] localedata: Missing country_name for mni_IN
3462 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3464 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3466 [22026] locale: iconv_open: heap overflow on gconv_init failure
3467 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3468 [22035] math: [m68k] bits/math-inline.h macro namespace
3469 [22038] localedata: Fix abbreviated weeks and months for Somali
3470 [22044] localedata: Remove redundant data for Limburgish Language
3471 [22050] malloc: Linking with -lmcheck does not hook
3472 __malloc_initialize_hook correctly
3473 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3474 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3475 [22070] localedata: charmaps/UTF-8: wcwidth for
3476 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3477 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3478 Jungseong and Jongseong) should be 0
3479 [22078] nss: nss_files performance issue in multi mode
3480 [22082] math: bits/math-finite.h exp10 condition
3481 [22086] libc: pcprofiledump incorrect cross-endian condition
3482 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3483 [22095] network: Name server address allocation memory leak in resolv.conf
3485 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3487 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3488 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3490 [22111] malloc: malloc: per thread cache is not returned when thread exits
3491 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3492 [22134] libc: [linux] implement fexecve with execveat
3493 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3495 [22145] libc: ttyname() gives up too early in the face of namespaces
3496 [22146] math: C++ build issue with float128 on x86_64
3497 [22153] nptl: nptl: save error code before process termination
3498 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3499 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3500 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3501 [22165] libc: [hppa] Text relocations in libc.so
3502 [22180] libc: destructor registered via __cxa_atexit is called twice
3503 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3504 symlinks") cause "make" segfaults
3505 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3507 [22207] libc: FAIL: stdlib/test-atexit-race
3508 [22225] math: nearbyint arithmetic moved before feholdexcept
3509 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3510 [22235] math: iscanonical in C++ and float128
3511 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3512 the svid compat wrapper
3513 [22244] math: ynf and yn are wrong without the svid compat wrapper
3514 [22273] libc: Improper assert in Linux posix_spawn implementation
3515 [22284] libc: -pg -pie doesn't work
3516 [22292] locale: localedef exits with error 4 when it should be error 1
3517 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3518 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3520 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3521 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3523 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3524 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3525 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3526 [22322] libc: [mips64] wrong bits/long-double.h installed
3527 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3528 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3530 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3531 [22343] malloc: Integer overflow in posix_memalign
3532 [22347] libc: getrandom() returns the number of bytes that were copied to
3533 the buffer even though the comments say "Return 0 on success and -1 on
3535 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3536 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3538 [22370] dynamic-link: Incorrect note padding check
3539 [22375] libc: malloc returns pointer from tcache_get when should return
3540 NULL (CVE-2017-17426)
3541 [22377] math: iseqsig, float128 and C++
3542 [22382] localedata: Error in tpi_PG locale
3543 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3544 inside the ASCII printable range
3545 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3547 [22403] localedata: Slash needs escaping in some locales
3548 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3549 [22409] network: res_hnok does not accept some host names used on the
3551 [22412] network: res_dnok, res_hnok should perform syntax checks
3552 [22413] network: ns_name_pton ignores syntactically invalid trailing
3554 [22415] stdio: setvbuf can lead to invalid free/segfault
3555 [22432] build: Non-deterministic build
3556 [22439] malloc: malloc_info should compute summary statistics for all sub-
3558 [22442] network: if_nametoindex could report index for the wrong
3559 networking interface
3560 [22446] build: aliasing violation calling readlink in handle_request
3561 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3562 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3563 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3564 __nscd_hash/__nss_hash
3565 [22463] network: p_secstodate overflow handling
3566 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3567 [22478] libc: sigwait can fail with EINTR
3568 [22505] libc: ldconfig processes include directive in locale-specific
3570 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3571 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3572 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3573 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3574 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3575 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3576 same as for Croatian
3577 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3578 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3579 [22577] libc: missing newline after "cannot allocate TLS data structures
3581 [22588] manual: manual/conf.texi: missing underscore in front of
3583 [22593] math: nextafter and nexttoward are declared with const attribute
3584 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3585 [22603] string: ia64 memchr overflows internal pointer check
3586 [22605] libc: SH clone does not set the exit code correctly
3587 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3589 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3590 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3591 modified in case of success
3592 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3593 [22615] manual: manual: ambiguous wording about errno value in case of
3595 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3597 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3598 binaries or if /proc is not mounted (CVE-2017-16997)
3599 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3600 [22630] build: $(no-pie-ldflag) is no longer effective
3601 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3602 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3603 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3604 [22637] nptl: guard size is subtracted from thread stack size instead of
3606 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3607 [22657] localedata: hu_HU: Avoid double space in date
3608 [22660] math: fmax, fmin sNaN handling on alpha
3609 [22664] libc: New warning of GCC8
3610 [22665] math: alpha: ceil and floor raise inexact exceptions
3611 [22666] math: alpha: trunc raise inexact exceptions
3612 [22667] libc: makecontext lacks stack alignment on i386
3613 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3614 [22679] libc: getcwd(3) can succeed without returning an absolute path
3616 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3617 elision and tunables
3618 [22687] math: [powerpc-nofpu] complex long double functions spurious
3620 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3621 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3622 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3624 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3625 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3627 [22701] nis: Incomplete removal of libnsl
3628 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3629 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3630 [22715] dynamic-link: FAIL: elf/tst-audit10
3631 [22719] libc: Backtrace tests fail on hppa
3632 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3633 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3634 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3635 before the first call to crypt_r () in crypt/badsalttest.c
3642 * A per-thread cache has been added to malloc. Access to the cache requires
3643 no locks and therefore significantly accelerates the fast path to allocate
3644 and free small amounts of memory. Refilling an empty cache requires locking
3645 the underlying arena. Performance measurements show significant gains in a
3646 wide variety of user workloads. Workloads were captured using a special
3647 instrumented malloc and analyzed with a malloc simulator. Contributed by
3648 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3650 * Unicode 10.0.0 Support: Character encoding, character type info, and
3651 transliteration tables are all updated to Unicode 10.0.0, using
3652 generator scripts contributed by Mike FABIAN (Red Hat).
3653 These updates cause user visible changes, especially the changes in
3654 wcwidth for many emoji characters cause problems when emoji sequences
3655 are rendered with pango, see for example:
3656 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3658 * Collation of Hungarian has been overhauled and is now consistent with "The
3659 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3662 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3664 - The GNU C Library will now detect when /etc/resolv.conf has been
3665 modified and reload the changed configuration. The new resolver option
3666 “no-reload” (RES_NORELOAD) disables this behavior.
3668 - The GNU C Library now supports an arbitrary number of search domains
3669 (configured using the “search” directive in /etc/resolv.conf);
3670 previously, there was a hard limit of six domains. For backward
3671 compatibility, applications that directly modify the ‘_res’ global
3672 object are still limited to six search domains.
3674 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3675 Library will now randomly pick a name server from the configuration as a
3676 starting point. (Previously, the second name server was always used.)
3678 * The tunables feature is now enabled by default. This allows users to tweak
3679 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3681 * New function reallocarray, which resizes an allocated block (like realloc)
3682 to the product of two sizes, with a guaranteed clean failure upon integer
3683 overflow in the multiplication. Originally from OpenBSD, contributed by
3684 Dennis Wölfing and Rüdiger Sonderfeld.
3686 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3687 These are extended versions of preadv and pwritev, respectively, taking an
3688 additional flags argument. The set of supported flags depends on the
3689 running kernel; full support currently requires kernel 4.7 or later.
3691 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3692 create a new session ID for the spawned process. This feature is
3693 scheduled to be added to the next major revision of POSIX; for the time
3694 being, it is available under _GNU_SOURCE.
3696 * errno.h is now safe to use from C-preprocessed assembly language on all
3697 supported operating systems. In this context, it will only define the
3698 Exxxx constants, as preprocessor macros expanding to integer literals.
3700 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3701 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3702 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3703 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3705 To compile programs that use this feature, the compiler must support
3706 128-bit floating point with the type name _Float128 (as defined by TS
3707 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3708 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3709 must be defined to make the new interfaces visible.
3711 The new functions and macros correspond to those present for other
3712 floating-point types (except for a few obsolescent interfaces not
3713 supported for the new type), with F128 or f128 suffixes; for example,
3714 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3715 printf or scanf formats for the new type; the strfromf128 and strtof128
3716 interfaces should be used instead.
3718 Deprecated and removed features, and other changes affecting compatibility:
3720 * The synchronization that pthread_spin_unlock performs has been changed to
3721 now be equivalent to a C11 atomic store with release memory order to the
3722 spin lock's memory location. Previously, several (but not all)
3723 architectures used stronger synchronization (e.g., containing what is
3724 often called a full barrier). This change can improve performance, but
3725 may affect odd fringe uses of spin locks that depend on the previous
3726 behavior (e.g., using spin locks as atomic variables to try to implement
3727 Dekker's mutual exclusion algorithm).
3729 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3732 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3733 will only be built and installed when the GNU C Library is configured with
3734 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3735 as TIRPC or rpcsvc-proto, to be used.
3737 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3738 libnss_compat, are deprecated, and will not be built or installed by
3741 The NIS(+) support library, libnsl, is also deprecated. By default, a
3742 compatibility shared library will be built and installed, but not headers
3743 or development libraries. Only a few NIS-related programs require this
3744 library. (In particular, the GNU C Library has never required programs
3745 that use 'gethostbyname' to be linked with libnsl.)
3747 Replacement implementations based on TIRPC, which additionally support
3748 IPv6, are available from <https://github.com/thkukuk/>. The configure
3749 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3750 name service modules, to be built and installed.
3752 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3753 support is enabled, the configured recursive resolver must support EDNS.
3754 (Responding to EDNS-enabled queries with responses which are not
3755 EDNS-enabled is fine, but FORMERR responses are not.)
3757 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3758 servers have not supported this opcode for a long time.
3760 * The _res_opcodes variable has been removed from libresolv. It had been
3761 exported by accident.
3763 * <string.h> no longer includes inline versions of any string functions,
3764 as this kind of optimization is better done by the compiler. The macros
3765 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3767 * The nonstandard header <xlocale.h> has been removed. Most programs should
3768 use <locale.h> instead. If you have a specific need for the definition of
3769 locale_t with no other declarations, please contact
3770 libc-alpha@sourceware.org and explain.
3772 * The obsolete header <sys/ultrasound.h> has been removed.
3774 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3776 * The obsolete function cfree has been removed. Applications should use
3779 * The stack_t type no longer has the name struct sigaltstack. This changes
3780 the C++ name mangling for interfaces involving this type.
3782 * The ucontext_t type no longer has the name struct ucontext. This changes
3783 the C++ name mangling for interfaces involving this type.
3785 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3786 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3787 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3788 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3789 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3790 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3791 fpregset_t type no longer has the name struct fpu. This changes the C++
3792 name mangling for interfaces involving those types.
3794 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3795 synced with the kernel:
3797 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3798 are not supported on this architecture and have been removed.
3800 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3801 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3802 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3804 Programs that assume the GET/SETREGS ptrace requests are universally
3805 available will now fail to build, instead of malfunctioning at runtime.
3807 Changes to build and runtime requirements:
3809 * Linux kernel 3.2 or later is required at runtime, on all architectures
3810 supported by that kernel. (This is a change from version 2.25 only for
3813 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3815 * On most architectures, GCC 4.9 or later is required to build the GNU C
3816 Library. On powerpc64le, GCC 6.2 or later is required.
3818 Older GCC versions and non-GNU compilers are still supported when
3819 compiling programs that use the GNU C Library. (We do not know exactly
3820 how old, and some GNU extensions to C may be _de facto_ required. If you
3821 are interested in helping us make this statement less vague, please
3822 contact libc-alpha@sourceware.org.)
3824 Security related changes:
3826 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3827 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3829 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3830 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3832 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3833 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3836 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3837 fixed (CVE-2017-12133).
3839 The following bugs are resolved with this release:
3841 [984] network: Respond to changed resolv.conf in gethostbyname
3842 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3843 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3845 [12189] libc: __stack_chk_fail should not attempt a backtrace
3847 [14096] time: Race condition on timezone/tst-timezone.out
3848 [14172] localedata: az_IR: new locale
3849 [14995] build: glibc fails to build if gold is the default linker, even if
3851 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3852 [16637] network: inet_pton function is accepting IPv6 with bad format
3853 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3854 x86 and other generic code
3855 [16875] localedata: ko_KR: fix lang_name
3856 [17225] localedata: ar_SY: localized month names for May and June are
3858 [17297] localedata: da_DK: wrong date_fmt string
3859 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3860 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3861 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3862 [19066] localedata: ar_SA abbreviated day and month names are in English
3863 [19569] network: resolv: Support an arbitrary number of search domains
3864 [19570] network: Implement random DNS server selection in the stub
3866 [19838] locale: localedef fails on PA-RISC
3867 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3868 order of 0D36 and 0D37
3869 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3871 [20098] libc: FAIL: debug/backtrace-tst on hppa
3872 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3874 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3876 [20313] localedata: Update locale data to Unicode 9.0
3877 [20424] manual: Document how to provide a malloc replacement
3878 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3880 [20686] locale: Add el_GR@euro to SUPPORTED.
3881 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3882 failures consistently
3883 [21015] dynamic-link: Document and fix --enable-bind-now
3884 [21016] nptl: pthread_cond support is broken on hppa
3885 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3886 frame-pointer on i386
3887 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3889 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3890 [21088] libc: Build fails with --enable-static-nss
3891 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3892 generic c code is used
3893 [21109] libc: Tunables broken on big-endian
3894 [21112] math: powf has large ulp errors with base close to 1 and exponent
3896 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3898 [21120] malloc: glibc malloc is incompatible with GCC 7
3899 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3901 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3902 (-0.0) when linking with -lieee
3903 [21171] math: log10, log2 and lgamma return incorrect results
3904 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3905 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3906 [21207] localedata: ce_RU: update weekdays from CLDR
3907 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3908 [21217] localedata: Update months from CLDR-31
3909 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3910 [21243] libc: support_delete_temp_file should issue warning for failed
3912 [21244] libc: support resolv_test_start() socket fd close should be
3914 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3915 new posix_spawn implementation
3916 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3917 leads to lower CPU frequency
3918 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3919 [21261] libc: [sparc64] bits/setjmp.h namespace
3920 [21267] network: [mips] bits/socket.h IOC* namespace
3921 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3922 [21270] libc: mmap64 silently truncates large offset values
3923 [21275] libc: posix_spawn always crashes on ia64 now
3924 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3925 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3926 [21289] libc: Incorrect declaration for 32-bit platforms with
3927 _FILE_OFFSET_BITS=64 causes build error
3928 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3929 not support gethostbyname4_r
3930 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3932 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3934 [21340] libc: Support POSIX_SPAWN_SETSID
3935 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3936 [21359] network: ns_name_pack needs additional byte in destination buffer
3937 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3938 against fragmentation attacks (CVE-2017-12132)
3939 [21369] network: resolv: Remove EDNS fallback
3940 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3942 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3943 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3944 [21393] stdio: Missing dup3 error check in freopen, freopen64
3945 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3946 [21399] localedata: Bad description for U00EC in
3947 localedata/charmaps/CP1254
3948 [21411] malloc: realloc documentation error
3949 [21426] network: sys/socket.h uio.h namespace
3950 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3951 [21445] libc: signal.h bsd_signal namespace
3952 [21455] network: Network headers stdint.h namespace
3953 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3955 [21475] network: resolv: Overlong search path is truncated mid-label
3956 [21511] libc: sigstack namespace
3957 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3958 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3959 bits/syscall.h: No such file or directory
3960 [21517] libc: struct sigaltstack namespace
3961 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3962 [21533] localedata: Update locale data to Unicode 10.0
3964 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3965 junk at end of line, first unrecognized character is `@'
3966 [21538] libc: SIG_HOLD missing for XPG4
3967 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3968 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3969 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3970 [21543] libc: sigevent namespace
3971 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3972 size for general purpose registers in mcontext_t structure
3973 [21550] libc: sigwait namespace
3974 [21552] libc: XPG4 bsd_signal namespace
3975 [21554] libc: sigpause namespace
3976 [21560] libc: sys/wait.h signal.h namespace
3977 [21561] libc: waitid namespace
3978 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3979 '/usr/include/stdlib.h': Permission denied
3980 [21575] libc: sys/wait.h missing struct rusage definition
3981 [21584] libc: sigaltstack etc namespace
3982 [21597] libc: siginterrupt namespace
3983 [21607] math: hppa: FAIL: math/test-tgmath
3984 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3986 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3987 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3988 stack and heap (CVE-2017-1000366)
3989 [21625] libc: wait3 namespace
3990 [21654] nss: Incorrect pointer alignment in NSS group merge result
3992 [21657] network: Parse interface zone id for node-local multicast
3993 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3995 [21666] libc: .symver is used on common symbol
3996 [21668] network: resolv: res_init cross-thread broadcast introduces race
3998 [21687] math: tgmath.h totalorder, totalordermag return type
3999 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
4001 [21696] libc: Incorrect assumption of of __cpu_mask in
4002 posix/sched_cpucount.c
4003 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
4004 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
4006 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
4007 leading to relocation crash
4008 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
4009 `resolv_conf_matches (resp, conf)' failed.
4010 [21710] localedata: Added Samoan language locale for Samoa
4011 [21711] localedata: Pashto yesstr/nostr locale are missing
4012 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
4013 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
4014 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
4015 [21723] localedata: yesstr/nostr missing for Chinese language locale
4016 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
4018 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
4020 [21728] localedata: New Locale for Tongan language
4021 [21729] localedata: incorrect LC_NAME fields for hi_IN
4022 [21733] localedata: yesstr and nostr are missing for zh_HK
4023 [21734] localedata: Missing yesstr and nostr are for kw_GB
4024 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
4025 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
4026 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
4027 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
4029 [21744] libc: Tests failing on --enable-tunables --enable-stack-
4031 [21749] localedata: Wrong abbreviated day name (“abday”) for
4033 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
4034 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
4035 [21759] localedata: missing yesstr and nostr for Tigrinya
4036 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
4037 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
4038 [21767] localedata: Missing Bislama locales
4039 [21768] localedata: Missing yesstr and nostr for aa_ET
4040 [21770] localedata: Missing Field in li_NL
4041 [21778] nptl: Robust mutex may deadlock
4042 [21779] libc: MicroBlaze segfaults when loading libpthread
4043 [21783] localedata: Fix int_select international_call_prefixes
4044 [21784] localedata: Inconsistency in country_isbn
4045 [21788] localedata: Missing Country Postal Abbreviations
4046 [21794] localedata: Added-country_isbn-for-Italy
4047 [21795] localedata: Add/Fix country_isbn for France
4048 [21796] localedata: Added country_isbn for Republic of Korea
4049 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
4050 [21799] localedata: Added int_select international_call_prefixes
4051 [21801] localedata: Added int_select international_call_prefixes
4052 [21804] nptl: Double semicolon in thread-shared-types.h
4053 [21807] localedata: LC_ADDRESS fix for pap_CW
4054 [21808] localedata: Fix LC_ADDRESS for pap_AW
4055 [21821] localedata: Added country_name in mai_IN
4056 [21822] localedata: Fix LC_TIME for mai_IN
4057 [21823] localedata: missing yesstr, nostr for sa_IN
4058 [21825] localedata: Fix name_mrs for mag_IN
4059 [21828] localedata: 2.26 changelog should mention user visible changes
4061 [21835] localedata: Added Maithili language locale for Nepal
4062 [21838] localedata: Removed redundant data for the_NP
4063 [21839] localedata: Fix LC_MONETARY for ta_LK
4064 [21844] localedata: Fix Latin characters and Months Sequence.
4065 [21848] localedata: Fix mai_NP Title Name
4070 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
4071 24731-2:2010, is supported to enable declarations of functions from that
4072 TR. Note that not all functions from that TR are supported by the GNU C
4075 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
4076 18661-1:2014, is supported to enable declarations of functions and macros
4077 from that TS. Note that not all features from that TS are supported by
4080 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
4081 18661-4:2015, is supported to enable declarations of functions and macros
4082 from that TS. Note that most features from that TS are not supported by
4085 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
4086 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
4087 Since the GNU C Library defaults to a much newer revision of POSIX, this
4088 will only affect programs that specifically request an old conformance
4089 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
4090 see a change in the visible declarations, but a program compiled with
4091 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
4094 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
4095 defined by all multithreaded code, but glibc has not required this for
4098 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
4099 means that in a future release, the macros “major”, “minor”, and “makedev”
4100 will only be available from <sys/sysmacros.h>.
4102 These macros are not part of POSIX nor XSI, and their names frequently
4103 collide with user code; see for instance glibc bug 19239 and Red Hat bug
4104 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
4105 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
4108 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
4109 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
4110 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
4112 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
4113 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
4114 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
4115 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
4116 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
4117 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
4118 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
4119 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
4120 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
4121 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
4122 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
4125 * New <math.h> features are added from TS 18661-1:2014:
4127 - Signaling NaN macros: SNANF, SNAN, SNANL.
4129 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
4130 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
4131 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
4133 - llogb functions: the llogb, llogbf and llogbl functions, and the
4134 FP_LLOGB0 and FP_LLOGBNAN macros.
4136 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
4139 - Comparison macros: iseqsig.
4141 - Classification macros: iscanonical, issubnormal, iszero.
4143 - Total order functions: totalorder, totalorderf, totalorderl,
4144 totalordermag, totalordermagf, totalordermagl.
4146 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
4148 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
4149 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
4151 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
4152 are added to libc. They convert a floating-point number into string.
4154 * Most of glibc can now be built with the stack smashing protector enabled.
4155 It is recommended to build glibc with --enable-stack-protector=strong.
4156 Implemented by Nick Alcock (Oracle).
4158 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
4159 intended to be used instead of memset() to erase sensitive data after use;
4160 the compiler will not optimize out calls to explicit_bzero even if they
4161 are "unnecessary" (in the sense that no _correct_ program can observe the
4162 effects of the memory clear).
4164 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
4165 to float instead of double. This does not affect the ABI of any libraries
4166 that are part of the GNU C Library, but may affect the ABI of other
4167 libraries that use this type in their interfaces.
4169 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
4170 float_t and double_t types are now defined to long double instead of float
4171 and double. These options are not the default, and this does not affect
4172 the ABI of any libraries that are part of the GNU C Library, but it may
4173 affect the ABI of other libraries that use this type in their interfaces,
4174 if they are compiled or used with those options.
4176 * The getentropy and getrandom functions, and the <sys/random.h> header file
4179 * The buffer size for byte-oriented stdio streams is now limited to 8192
4180 bytes by default. Previously, on Linux, the default buffer size on most
4181 file systems was 4096 bytes (and thus remains unchanged), except on
4182 network file systems, where the buffer size was unpredictable and could be
4183 as large as several megabytes.
4185 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
4186 for the Linux quota interface which predates kernel version 2.4.22 has
4189 * The malloc_get_state and malloc_set_state functions have been removed.
4190 Already-existing binaries that dynamically link to these functions will
4191 get a hidden implementation in which malloc_get_state is a stub. As far
4192 as we know, these functions are used only by GNU Emacs and this change
4193 will not adversely affect already-built Emacs executables. Any undumped
4194 Emacs executables, which normally exist only during an Emacs build, should
4195 be rebuilt by re-running “./configure; make” in the Emacs build tree.
4197 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
4198 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
4199 “no-ip6-dotint” had already been the default, and support for the
4200 “ip6-dotint” option was removed from the Internet in 2006.
4202 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
4203 flag from <resolv.h> have been removed. The option relied on a
4204 backwards-incompatible DNS extension which was never deployed on the
4207 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
4208 RES_BLAST defined in the <resolv.h> header file have been deprecated.
4209 They were already unimplemented.
4211 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
4212 _res.flags are deprecated. The flag was standardized in RFC 2133, but
4213 removed again from the IETF name lookup interface specification in RFC
4214 2553. Applications should use getaddrinfo instead.
4216 * DNSSEC-related declarations and definitions have been removed from the
4217 <arpa/nameser.h> header file, and libresolv will no longer attempt to
4218 decode the data part of DNSSEC record types. Previous versions of glibc
4219 only implemented minimal support for the previous version of DNSSEC, which
4220 is incompatible with the currently deployed version.
4222 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
4223 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
4224 <arpa/nameser.h> header file because the distinction between RR types and
4225 meta-RR types is not officially standardized, subject to revision, and
4226 thus not suitable for encoding in a macro.
4228 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
4229 and rhook members of the res_state type in <resolv.h> have been removed.
4230 The glibc stub resolver did not support these hooks, but the header file
4231 did not reflect that.
4233 * For multi-arch support it is recommended to use a GCC which has
4234 been built with support for GNU indirect functions. This ensures
4235 that correct debugging information is generated for functions
4236 selected by IFUNC resolvers. This support can either be enabled by
4237 configuring GCC with '--enable-gnu-indirect-function', or by
4238 enabling it by default by setting 'default_gnu_indirect_function'
4239 variable for a particular architecture in the GCC source file
4242 * GDB pretty printers have been added for mutex and condition variable
4243 structures in POSIX Threads. When installed and loaded in gdb these pretty
4244 printers show various pthread variables in human-readable form when read
4245 using the 'print' or 'display' commands in gdb.
4247 * Tunables feature added to allow tweaking of the runtime for an application
4248 program. This feature can be enabled with the '--enable-tunables' configure
4249 flag. The GNU C Library manual has details on usage and README.tunables has
4250 instructions on adding new tunables to the library.
4252 * A new version of condition variables functions have been implemented in
4253 the NPTL implementation of POSIX Threads to provide stronger ordering
4256 * A new version of pthread_rwlock functions have been implemented to use a more
4257 scalable algorithm primarily through not using a critical section anymore to
4260 Security related changes:
4262 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4263 have been created with makecontext could fail to terminate due to a
4264 missing .cantunwind annotation. This has been observed to lead to a hang
4265 (denial of service) in some Go applications compiled with gccgo. Reported
4266 by Andreas Schwab. (CVE-2016-6323)
4268 * The DNS stub resolver functions would crash due to a NULL pointer
4269 dereference when processing a query with a valid DNS question type which
4270 was used internally in the implementation. The stub resolver now uses a
4271 question type which is outside the range of valid question type values.
4274 The following bugs are resolved with this release:
4276 [4099] stdio: Overly aggressive caching by stream i/o functions.
4277 [7065] build: Support building glibc with -fstack-protector or -fstack-
4279 [9842] localedata: en_CA: incorrect date format
4280 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4281 before it started waiting
4282 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4283 [15765] nptl: sem_open is wrongly a cancellation point
4284 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4285 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4287 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4288 library linked with pthread
4289 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4290 "FIXME: Ingo" issue)
4291 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4292 [17252] libc: getrandom and getentropy syscall
4293 [17730] malloc: thread-local storage is sometimes improperly free()'d
4294 after being __libc_memalign()'d
4295 [18241] stdio: failed fseek on memstream does not set errno and can fail
4297 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4299 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4300 PTHREAD_PRIO_INHERIT mutex on ARM
4301 [18784] network: res_query and related function crash for special record
4302 type queries (CVE-2015-5180)
4303 [19380] math: strtod does not raise "inexact"
4304 [19387] string: Integer overflow in memchr
4305 [19390] string: Integer overflow in strncat
4306 [19398] build: linknamespace tests fail with massively parallel build
4307 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4309 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4310 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4311 [19514] libc: [PATCH] Fix spelling errors in spelling
4312 "implement"/"implementation" in several places
4313 [19582] network: Deprecate RES_USE_INET6
4314 [19673] manual: clog10 docs appear to be erroneous
4315 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4316 causes a segmentation fault
4317 [19826] libc: invalid pointer returned from __tls_get_addr with static
4319 [20016] network: resolv: Remove hooks support from the API
4320 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4322 [20033] math: [x86_64] vectorized math function don't call the __finite
4324 [20116] nptl: use after free in pthread_create
4325 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4326 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4328 [20311] nptl: please install proc_service.h
4329 [20366] libc: Compilation errors in installed headers in strict-compliance
4331 [20370] malloc: malloc: Arena free list management is still racy
4332 (incorrect fix in bug 19243)
4333 [20386] libc: assert (X = 0) does not result in GCC warning
4334 [20432] malloc: malloc: Minimize interface required for interposition
4335 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4336 in _Unwind_Backtrace (CVE-2016-6323)
4337 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4338 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4340 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4341 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4342 [20477] network: resolv: incorrect double-checked locking related to
4344 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4346 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4348 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4349 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4350 cause transition penalty
4351 [20517] math: sparcv9 missing fdiml compat symbol
4352 [20524] manual: strverscmp is inconsistent
4353 [20525] libc: <sys/quota.h> should be based on kernel headers
4354 [20539] math: GCC 7 -static -lm fails to link at -O3
4355 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4357 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4359 [20591] network: Remove obsolete DNSSEC support
4360 [20592] network: DNS resource record type classification macros in
4361 <arpa/nameser.h> are incorrect
4362 [20593] network: Update DNS RR type definitions
4363 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4364 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4366 [20629] network: libresolv: Remove support for bitstring labels
4368 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4369 assertion: "maxidx >= 2"
4370 [20660] math: [arm] Use VSQRT
4371 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4372 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4373 [20689] libc: Test for FMA should also check for AVX.
4374 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4375 [20715] math: iszero macro breaks existing code
4376 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4377 [20728] libc: powerpc: Missing TOC stub in clone
4378 [20729] build: glibc-2.24 fails to build for i486 with -Os
4379 [20750] build: Build fails with default PIE enabled gcc-6.x
4380 [20768] math: [alpha] sqrt fegetenv namespace
4381 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4383 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4384 __FLT_EVAL_METHOD__ is 2
4385 [20790] network: rpcgen buffer overrun in get_prog_declaration
4386 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4387 [20829] libc: crypt snprintf namespace
4388 [20847] libc: tst-vfork3 failure
4389 [20855] math: Default bits/mathdef.h has inappropriate float_t
4390 [20859] math: [sh4] FP_ILOGB0 invalid
4391 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4392 U+20AC), not same as GBK
4393 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4394 [20916] math: pow handling of sNaN arguments
4395 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4396 [20919] math: Bad pow (qNaN, 0) result with -lieee
4397 [20940] math: hypot sNaN handling
4398 [20947] math: fmax, fmin sNaN handling
4399 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4400 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4402 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4403 [20973] nptl: robust mutexes: Lost wake-ups
4404 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4405 [20978] nis: strlen on null pointer in nss_nisplus
4406 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4408 [21014] string: i686 memchr overflows internal pointer check
4409 [21019] libc: [mips] n32 lseek incorrect on overflow
4410 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4411 [21026] libc: [MIPS] readahead syscall is broken on n64
4412 [21028] math: Fallback fesetexceptflag should always succeed
4413 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4414 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4416 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4417 [21061] librt: [microblaze] librt lost clock_* exports
4418 [21073] libc: tunables: insecure environment variables passed to
4419 subprocesses with AT_SECURE
4420 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4424 * The minimum Linux kernel version that this version of the GNU C Library
4425 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4426 kernel version 2.6.32 or later suffices (on architectures that already
4427 required kernel versions more recent than 3.2, those requirements remain
4428 unchanged). Linux 3.2 or later kernel headers are required on all
4431 * The pap_AN locale has been deleted. This has been deprecated for a long
4432 time. It has been replaced by pap_AW & pap_CW, both of which have long
4433 been included in previous releases.
4435 * The readdir_r and readdir64_r functions have been deprecated. It is
4436 recommended to use readdir and readdir64 instead.
4438 * The type “union wait” has been removed. It was deprecated in the early
4439 1990s and never part of POSIX. Application code should use the int type
4440 instead of “union wait”.
4442 * A new NSS action is added to facilitate large distributed system
4443 administration. The action, MERGE, allows remote user stores like LDAP
4444 to be merged into local user stores like /etc/groups in order to provide
4445 easy to use, updated, and managed sets of merged credentials. The new
4446 action can be used by configuring it in /etc/nsswitch.conf:
4447 group: files [SUCCESS=merge] nis
4448 Implemented by Stephen Gallagher (Red Hat).
4450 * The deprecated __malloc_initialize_hook variable has been removed from the
4453 * The long unused localedef --old-style option has been removed. It hasn't
4454 done anything in over 16 years. Scripts using this option can safely
4457 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4458 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4459 return the next representable value in the direction of positive infinity
4460 and the nextdown functions return the next representable value in the
4461 direction of negative infinity. These are currently enabled as GNU
4464 Security related changes:
4466 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4467 could result in a stack overflow when getnetbyname was called with an
4468 overly long name. (CVE-2016-3075)
4470 * Previously, getaddrinfo copied large amounts of address data to the stack,
4471 even after the fix for CVE-2013-4458 has been applied, potentially
4472 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4473 instead. Reported by Michael Petlan. (CVE-2016-3706)
4475 * The glob function suffered from a stack-based buffer overflow when it was
4476 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4477 Reported by Alexander Cherepanov. (CVE-2016-1234)
4479 * The Sun RPC UDP client could exhaust all available stack space when
4480 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4481 alloca plugin for GCC. (CVE-2016-4429)
4483 * The IPv6 name server management code in libresolv could result in a memory
4484 leak for each thread which is created, performs a failing naming lookup,
4485 and exits. Over time, this could result in a denial of service due to
4486 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4488 The following bugs are resolved with this release:
4490 [1170] localedata: ne_NP: update Nepali locale definition file
4491 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4493 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4494 [6796] math: fdim() does not set errno on overflow
4495 [10354] libc: posix_spawn should use vfork() in more cases than presently
4496 [11213] localedata: localedata: add copyright disclaimer to locale files
4497 [12143] localedata: chr_US: new Cherokee locale
4498 [12450] localedata: sgs_LT: new locale
4499 [12676] localedata: ln_CD: new locale
4500 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4502 [13304] math: fma, fmaf, fmal produce wrong results
4503 [14259] build: --localedir arg to configure is ignored
4504 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4505 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4506 [14934] localedata: es_CL: wrong first weekday chilean locale
4507 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4509 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4511 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4512 [15368] nptl: raise() is not async-signal-safe
4513 [15479] math: ceil, floor, round and trunc raise inexact exception
4514 [15578] localedata: kk_KZ: various updates
4515 [16003] localedata: pap_AN: punt old locale
4516 [16137] localedata: iw_IL: punt old locale
4517 [16190] localedata: eo: new esperanto locale
4518 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4519 [16742] malloc: race condition: pthread_atfork() called before first
4520 malloc() results in unexpected locking behaviour/deadlocks
4521 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4523 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4524 [17565] localedata: pt_PT: wrong (work-)week start
4525 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4526 [17950] build: Build fails with -msse
4527 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4528 [18433] libc: posix_spawn does not return correctly upon failure to
4530 [18453] localedata: charmaps/IBM875: incorrect codes
4531 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4533 [18896] localedata: he_IL: improvements for currency
4534 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4535 Romanian locale data
4536 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4538 [19056] libc: Deprecate readdir_r
4539 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4541 [19198] localedata: nl_NL: small improvements for Dutch locales
4542 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4543 nameservers (CVE-2016-5417)
4544 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4546 [19400] locale: Language missing in "iso-639.def", trivial fix in
4548 [19431] malloc: Deadlock between fflush, getdelim, and fork
4549 [19505] libc: Incorrect file descriptor validity checks in
4550 posix_spawn_file_actions_add{open,close,dup2}
4551 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4552 when using RTLD_NEXT
4553 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4554 `intl/{gettextP,loadinfo}.h'
4555 [19534] libc: execle, execlp may use malloc
4556 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4557 [19573] network: res_nclose and __res_maybe_init disagree about name
4558 server initialization, breaking Hesiod
4559 [19575] localedata: Status of GB18030 tables
4560 [19581] localedata: sr_* date_fmt string contains additional newline
4561 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4563 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4564 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4565 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4566 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4568 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4570 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4572 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4573 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4574 [19633] locale: strfmon_l applies global locale to number formatting
4575 [19642] network: Memory leak in getnameinfo
4576 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4577 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4579 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4580 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4582 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4583 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4585 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4587 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4589 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4590 pointers and lengths in error-case.
4591 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4592 report errors on UTF-16 surrogates values.
4593 [19755] nscd: nscd assertion failure in gc
4594 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4595 [19759] libc: mempcpy shouldn't be inlined
4596 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4597 [19765] libc: s390 needs an optimized mempcpy
4598 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4599 NAME_MAX limit assumption (CVE-2016-1234)
4600 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4601 [19787] network: Missing and incorrect truncation checks in getnameinfo
4602 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4604 [19791] network: Assertion failure in res_query.c with un-connectable name
4606 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4607 [19822] math: libm.so install clobbers old version
4608 [19825] network: resolv: send_vc can return uninitialized data in second
4609 response to getaddrinfo
4610 [19830] network: nss_dns: should check RDATA length against buffer length
4611 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4612 confronted with A/AAAA records of invalid size
4613 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4614 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4615 [19853] stdio: Printing IBM long double in decimal with high precision is
4617 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4618 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4619 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4621 [19865] network: Assertion failure or memory leak in
4622 _nss_dns_getcanonname_r
4623 [19868] network: nss_dns: netent code does not skip over non-PTR records
4624 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4626 [19881] string: Improve x86-64 memset
4627 [19907] string: Incorrect memcpy tests
4628 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4630 [19925] libc: termios.h XCASE namespace
4631 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4632 [19929] libc: limits.h NL_NMAX namespace
4633 [19931] stdio: Memory leak in vfprintf
4634 [19957] libc: clone(CLONE_VM) access invalid parent memory
4635 [19963] localedata: en_IL: New locale
4636 [19989] stdio: stdio.h cuserid namespace
4637 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4639 [19996] locale: langinfo.h nl_langinfo_l namespace
4640 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4641 [20010] network: getaddrinfo: Stack overflow in hostent translation
4643 [20012] stdio: libio: fmemopen append mode failure
4644 [20014] stdio: stdio.h namespace for pre-threads POSIX
4645 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4646 [20023] libc: fcntl.h timespec namespace
4647 [20024] math: [x86_64] vectorized sincos trashes the stack
4648 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4649 [20041] time: sys/time.h timespec namespace
4650 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4651 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4652 [20051] libc: ttyslot in wrong header under wrong conditions
4653 [20054] libc: gethostname not declared for XPG4
4654 [20055] libc: termios.h missing tcgetsid for XPG4
4655 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4657 [20073] libc: sys/stat.h fchmod namespace
4658 [20074] libc: stdlib.h rand_r namespace
4659 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4660 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4662 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4663 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4665 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4666 [20119] libc: Wrong mask for processors level type from CPUID
4667 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4668 AS not supporting AVX512
4669 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4671 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4672 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4674 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4675 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4676 [20178] libc: posix_spawn{p} should not call exit
4677 [20191] stdio: libio: vtables hardening
4678 [20195] string: FMA4 detection requires CPUID execution with register
4680 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4681 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4683 [20212] math: acos (sNaN) returns sNaN
4684 [20213] math: asin (sNaN) returns sNaN
4685 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4686 [20218] math: [i386] asinhl (sNaN) returns sNaN
4687 [20219] math: [i386] atanhl (sNaN) returns sNaN
4688 [20222] stdio: fopencookie: Mangle function pointers
4689 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4690 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4691 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4693 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4694 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4695 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4696 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4697 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4698 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4699 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4700 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4701 [20240] math: modf (sNaN) returns sNaN
4702 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4703 [20250] math: frexp (sNaN) returns sNaN
4704 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4705 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4707 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4708 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4709 subscript is below array bounds [-Werror=array-bounds]
4710 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4711 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4713 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4714 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4716 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4717 "invalid" exceptions
4718 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4719 [20316] localedata: id_ID: Februari instead of Pebruari
4720 [20327] string: POWER8 strcasecmp returns incorrect result
4721 [20347] math: Failure: Test: j0_downward (0xap+0)
4722 [20348] libc: FAIL: misc/tst-preadvwritev64
4723 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4724 [20350] libc: There is no test for p{read,write}64
4725 [20357] math: Incorrect cos result for 1.5174239687223976
4726 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4730 * Unicode 8.0.0 Support: Character encoding, character type info, and
4731 transliteration tables are all updated to Unicode 8.0.0, using new
4732 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4733 These updates cause user visible changes, such as the fixes for bugs
4734 89, 16061, and 18568.
4736 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4737 kernel-internal CPU set size. This means that requests that change the
4738 CPU affinity which failed before (for example, an all-ones CPU mask) will
4739 now succeed. Applications that need to determine the effective CPU
4740 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4741 setting it because the kernel can adjust it (and the previous size check
4742 would not detect this in the majority of cases).
4744 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4745 the following new symbols are used: fts64_children, fts64_close,
4746 fts64_open, fts64_read and fts64_set.
4748 * getaddrinfo now detects certain invalid responses on an internal netlink
4749 socket. If such responses are received, an affected process will
4750 terminate with an error message of "Unexpected error <number> on netlink
4751 descriptor <number>" or "Unexpected netlink response of size <number> on
4752 descriptor <number>". The most likely cause for these errors is a
4753 multi-threaded application which erroneously closes and reuses the netlink
4754 file descriptor while it is used by getaddrinfo.
4756 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4757 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4758 unnecessary serialization of memory allocation requests across threads.
4759 The defect is now corrected. Users should see a substantial increase in
4760 the concurrent throughput of allocation requests for applications which
4761 trigger this bug. Affected applications typically create and
4762 destroy threads frequently. (Bug 19048 was reported and analyzed by
4765 * There is now a --disable-timezone-tools configure option for disabling the
4766 building and installing of the timezone related utilities (zic, zdump, and
4767 tzselect). This is useful for people who build the timezone data and code
4768 independent of the GNU C Library.
4770 * The obsolete header <regexp.h> has been removed. Programs that require
4771 this header must be updated to use <regex.h> instead.
4773 * The obsolete functions bdflush, create_module, get_kernel_syms,
4774 query_module and uselib are no longer available to newly linked binaries;
4775 the header <sys/kdaemon.h> has been removed. These functions and header
4776 were specific to systems using the Linux kernel and could not usefully be
4777 used with the GNU C Library on systems with version 2.6 or later of the
4780 * Optimized string, wcsmbs and memory functions for IBM z13.
4781 Implemented by Stefan Liebler.
4783 * Newly linked programs that define a variable called signgam will no longer
4784 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4785 require signgam to be set by those functions must ensure that they use the
4786 variable provided by the GNU C Library and declared in <math.h>, without
4787 defining their own copy.
4789 * The minimum GCC version that can be used to build this version of the GNU
4790 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4791 still be used to compile programs using the GNU C Library.
4793 Security related changes:
4795 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4796 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4798 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4799 the pointer guard feature. It is always enabled. Previously,
4800 LD_POINTER_GUARD could be used to disable security hardening in binaries
4801 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4804 * An integer overflow in hcreate and hcreate_r could lead to an
4805 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4807 * The catopen function no longer has unbounded stack usage. Reported by
4808 Max. (CVE-2015-8779)
4810 * The nan, nanf and nanl functions no longer have unbounded stack usage
4811 depending on the length of the string passed as an argument to the
4812 functions. Reported by Joseph Myers. (CVE-2014-9761)
4814 * A stack-based buffer overflow was found in libresolv when invoked from
4815 libnss_dns, allowing specially crafted DNS responses to seize control
4816 of execution flow in the DNS client. The buffer overflow occurs in
4817 the functions send_dg (send datagram) and send_vc (send TCP) for the
4818 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4819 family. The use of AF_UNSPEC triggers the low-level resolver code to
4820 send out two parallel queries for A and AAAA. A mismanagement of the
4821 buffers used for those queries could result in the response of a query
4822 writing beyond the alloca allocated buffer created by
4823 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4824 the overflow. Thanks to the Google Security Team and Red Hat for
4825 reporting the security impact of this issue, and Robert Holiday of
4826 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4828 The following bugs are resolved with this release:
4830 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4831 [887] math: Math library function "logb" and "nextafter" inconsistent
4832 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4833 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4834 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4835 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4837 [4404] localedata: German translation of "Alarm clock" is misleading
4838 [6799] math: nextafter() and nexttoward() doesn't set errno on
4839 overflow/underflow errors
4840 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4842 [10432] nis: _nss_nis_setnetgrent assertion failure
4843 [11460] libc: fts has no LFS support
4844 [12926] network: getaddrinfo()/make_request() may spin forever
4845 [13065] nptl: Race condition in pthread barriers
4846 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4847 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4849 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4850 [14912] libc: Rename non-installed bits/*.h headers
4851 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4852 [15367] math: Let gcc use __builtin_isinf
4853 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4854 [15421] math: lgamma wrongly sets signgam for ISO C
4855 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4856 FE_INVALID with argument out of range
4857 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4859 [15786] dynamic-link: ifunc resolver functions can smash function
4861 [15918] math: Unnecessary check for equality in hypotf()
4862 [16061] localedata: Review / update transliteration data
4863 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4865 [16141] time: strptime %z offset restriction
4866 [16171] math: drem should be alias of remainder
4867 [16296] math: fegetround is pure?
4868 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4869 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4871 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4872 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4874 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4875 "Exception "Inexact" set" on ppc32
4876 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4877 [16517] math: Missing underflow exception from tanf/tan/tanl
4878 [16519] math: Missing underflow exception from sinhf
4879 [16520] math: Missing underflow exception from tanhf
4880 [16521] math: Missing underflow exception from exp2
4881 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4883 [16734] stdio: fopen calls mmap to allocate its buffer
4884 [16961] math: nan function incorrect handling of bad sequences
4885 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4886 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4887 [16985] locale: localedef: confusing error message when opening output
4889 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4890 [17197] locale: Redundant shift character in iconv conversion output at
4892 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4893 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4894 [17250] dynamic-link: static linking breaks nss loading
4895 (getaddrinfo/getpwnam/etc...)
4896 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4898 [17441] math: isnan() should use __builtin_isnan() in GCC
4899 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4900 (related to lock elision)
4901 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4902 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4903 [17887] time: strptime should be able to parse "+01:00" style timezones
4904 [17905] libc: catopen() Multiple unbounded stack allocations
4906 [18084] libc: backtrace (..., 0) dumps core on x86
4907 [18086] libc: nice() sets errno to 0 on success
4908 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4909 is too large (CVE-2015-8778)
4910 [18251] dynamic-link: SONAME missing when audit modules provides path
4911 [18265] libc: add attributes for wchar string and memory functions
4912 [18370] math: csqrt missing underflows
4913 [18421] libc: [hppa] read-only segment has dynamic relocations
4914 [18472] libc: Obsolete syscall wrappers should be compat symbols
4915 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4916 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4917 [18525] localedata: Remove locale timezone information
4918 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4919 [18568] localedata: Update locale data to Unicode 8.0
4920 [18589] locale: sort-test.sh fails at random
4921 [18595] math: ctan, ctanh missing underflows
4922 [18604] libc: assert macro-expands its argument
4923 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4924 contains a vector instruction exception.
4925 [18611] math: j1, jn missing errno setting on underflow
4926 [18618] localedata: sync Chechen locale definitions with other *_RU
4928 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4929 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4930 [18665] network: In send_dg, the recvfrom function is NOT always using the
4931 buffer size of a newly created buffer (CVE-2015-7547)
4932 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4934 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4936 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4937 [18699] math: tilegx cproj() for various complex infinities does not yield
4939 [18724] libc: Harden put*ent functions against data injection
4940 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4941 [18755] build: build errors with -DNDEBUG
4942 [18757] stdio: fmemopen fails to set errno on failure
4943 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4945 [18781] libc: openat64 lacks O_LARGEFILE
4946 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4947 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4948 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4949 [18790] math: [ldbl-128ibm] tanhl inaccurate
4950 [18795] libc: stpncpy fortification misses buffer lengths that are
4951 statically too large
4952 [18796] build: build fails for --disable-mathvec
4953 [18803] math: hypot missing underflows
4954 [18820] stdio: fmemopen may leak memory on failure
4955 [18823] math: csqrt spurious underflows
4956 [18824] math: fma spurious underflows
4957 [18825] math: pow missing underflows
4958 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4959 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4960 [18870] build: sem_open.c fails to compile with missing symbol
4962 [18872] stdio: Fix memory leak in printf_positional
4963 [18873] libc: posix_fallocate overflow check ineffective
4964 [18875] math: Excess precision leads incorrect libm
4965 [18877] libc: arm: mmap offset regression
4966 [18887] libc: memory corruption when using getmntent on blank lines
4967 [18918] localedata: hu_HU: change time to HH:MM:SS format
4968 [18921] libc: Regression: extraneous stat() and fstat() performed by
4970 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4971 binaries (CVE-2015-8777)
4972 [18951] math: tgamma missing underflows
4973 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4975 [18953] localedata: lt_LT: change currency symbol to the euro
4976 [18956] math: powf inaccuracy
4977 [18961] math: [i386] exp missing underflows
4978 [18966] math: [i386] exp10 missing underflows
4979 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4980 [18969] build: multiple string test failures due to missing locale
4982 [18970] libc: Reference of pthread_setcancelstate in libc.a
4983 [18977] math: float / long double Bessel functions not in XSI POSIX
4984 [18980] math: i386 libm functions return with excess range and precision
4985 [18981] math: i386 scalb*, ldexp return with excess range and precision
4986 [18982] stdio: va_list and vprintf
4987 [18985] time: Passing out of range data to strftime() causes a segfault
4989 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4990 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4991 [19012] locale: iconv_open leaks memory on error path
4992 [19016] math: clog, clog10 inaccuracy
4993 [19018] nptl: Mangle function pointers in tls_dtor_list
4994 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4995 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4996 [19048] malloc: malloc: arena free list can become cyclic, increasing
4998 [19049] math: [powerpc] erfc incorrect zero sign
4999 [19050] math: [powerpc] log* incorrect zero sign
5000 [19058] math: [x86_64] Link fail with -fopenmp and -flto
5001 [19059] math: nexttoward overflow incorrect in non-default rounding modes
5002 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
5003 [19074] network: Data race in _res_hconf_reorder_addrs
5004 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
5005 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
5006 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
5008 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
5010 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
5011 [19086] manual: posix_fallocate64 documented argument order is wrong.
5012 [19088] math: lround, llround missing exceptions close to overflow
5014 [19094] math: lrint, llrint missing exceptions close to overflow threshold
5015 [19095] math: dbl-64 lrint incorrect for 64-bit long
5016 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
5017 [19124] dynamic-link: ld.so failed to build with older assembler
5018 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
5019 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
5020 [19134] math: [powerpc32] lround, lroundf spurious exceptions
5021 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
5022 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
5023 pthread_setaffinity_np
5024 [19156] math: [ldbl-128] j0l spurious underflows
5025 [19164] nptl: tst-getcpu fails with many possible CPUs
5026 [19168] math: math/test-ildoubl and math/test-ldouble failure
5027 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
5028 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
5030 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
5031 (FE_NOMASK_ENV) do not clear SSE exceptions
5032 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
5033 _int_new_arena/reused_arena
5034 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
5035 [19201] math: dbl-64 remainder incorrect sign of zero result
5036 [19205] math: bits/math-finite.h conditions do not match math.h and
5038 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
5039 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
5040 for C99-based standards
5041 [19212] libc: features.h not -Wundef clean
5042 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
5044 [19214] libc: Family and model identification for AMD CPU's are incorrect.
5045 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
5046 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
5048 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
5049 "inexact" exceptions
5050 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
5052 [19242] libc: strtol incorrect in Turkish locales
5053 [19243] malloc: reused_arena can pick an arena on the free list, leading
5054 to an assertion failure and reference count corruption
5055 [19253] time: tzset() ineffective when temporary TZ did not include DST
5057 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
5058 [19270] math: [hppa] Shared libm missing __isnanl
5059 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
5060 MAP_HUGETLB and MAP_STACK defines
5061 [19313] nptl: Wrong __cpu_mask for x32
5062 [19347] libc: grantpt: try to force a specific gid even without pt_chown
5063 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
5064 [19350] math: [ldbl-128ibm] sinhl spurious overflows
5065 [19351] math: [ldbl-128ibm] logl inaccurate near 1
5066 [19363] time: x32: times() return value wrongly truncates/sign extends
5068 [19367] dynamic-link: Improve branch prediction on Silvermont
5069 [19369] network: Default domain name not reset by res_ninit when "search"
5070 / "domain" entry is removed from resolv.conf
5071 [19375] math: powerpc: incorrect results for POWER7 logb with negative
5073 [19385] localedata: bg_BG: time separator should be colon, not comma
5074 [19408] libc: linux personality syscall wrapper may erroneously return an
5075 error on 32-bit architectures
5076 [19415] libc: dladdr returns wrong names on hppa
5077 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
5078 IBM905, IBM907, and IBM909
5079 [19439] math: Unix98 isinf and isnan functions conflict with C++11
5080 [19443] build: build failures with -DDEBUG
5081 [19451] build: Make check fails on test-double-vlen2
5082 [19462] libc: Glibc failed to build with -Os
5083 [19465] math: Wrong code with -Os
5084 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
5086 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
5088 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
5089 [19486] math: S390: Math tests fail with "Exception Inexact set".
5090 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
5091 [19550] libc: [mips] mmap negative offset handling inconsistent with other
5093 [19590] math: Fail to build shared objects that use libmvec.so functions.
5097 * The following bugs are resolved with this release:
5099 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
5100 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
5101 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
5102 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
5103 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
5104 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
5105 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
5106 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
5107 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
5108 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
5109 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
5110 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
5111 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
5112 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
5113 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
5114 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
5115 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
5116 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
5117 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
5118 18657, 18676, 18694, 18696, 18887.
5120 * Cache information can be queried via sysconf() function on s390 e.g. with
5121 _SC_LEVEL1_ICACHE_SIZE as argument.
5123 * A buffer overflow in gethostbyname_r and related functions performing DNS
5124 requests has been fixed. If the NSS functions were called with a
5125 misaligned buffer, the buffer length change due to pointer alignment was
5126 not taken into account. This could result in application crashes or,
5127 potentially arbitrary code execution, using crafted, but syntactically
5128 valid DNS responses. (CVE-2015-1781)
5130 * The time zone file parser has been made more robust against crafted time
5131 zone files, avoiding heap buffer overflows related to the processing of
5132 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
5133 large time zone data files. Overly long time zone specifiers in the TZ
5134 variable no longer result in stack overflows and crashes.
5136 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
5137 for LD and GD on x86 and x86-64, has been implemented. You will need
5138 binutils-2.24 or later to enable this optimization.
5140 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
5141 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
5142 Hat). These updates cause user visible changes, such as the fix for bug
5145 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
5146 and getXXbyYY NSS calls for the same database, causing a denial-of-service
5147 condition in some applications.
5149 * Added vector math library named libmvec with the following vectorized x86_64
5150 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
5152 The library can be disabled with --disable-mathvec. Use of the functions is
5153 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
5154 Shared library libmvec.so is linked in as needed when using -lm (no need to
5155 specify -lmvec explicitly for not static builds).
5156 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
5158 * A new fmemopen implementation has been added with the goal of POSIX
5159 compliance. The new implementation fixes the following long-standing
5160 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
5161 old implementation is still present for use be by existing binaries.
5163 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
5164 releases. It has been fixed to match 2.19 and older, but binaries built
5165 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
5167 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
5168 Contributed by Roland McGrath (Google).
5170 * The header <regexp.h> is deprecated, and will be removed in a future
5171 release. Use of this header will trigger a deprecation warning.
5172 Application developers should update their code to use <regex.h> instead.
5174 This header was formerly part of SUS, but was deprecated in 1994 and
5175 removed from the standard in 2001. Also, the glibc implementation
5176 leaks memory. See BZ#18681 for more details.
5180 * The following bugs are resolved with this release:
5182 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
5183 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
5184 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
5185 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
5186 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
5187 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
5188 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
5189 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
5190 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
5191 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
5194 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
5195 too little memory for the to-be-scanned arguments and overflow the
5196 allocated buffer. The implementation now correctly computes the required
5197 buffer size when using malloc, and switches to malloc from alloca as
5200 * A new semaphore algorithm has been implemented in generic C code for all
5201 machines. Previous custom assembly implementations of semaphore were
5202 difficult to reason about or ensure that they were safe. The new version
5203 of semaphore supports machines with 64-bit or 32-bit atomic operations.
5204 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
5205 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
5207 * Port to Altera Nios II has been contributed by Mentor Graphics.
5209 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
5210 implementations for powerpc64/powerpc64le.
5211 Implemented by Adhemerval Zanella (IBM).
5213 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
5214 and powerpc64le. This may improve lock scaling of existing programs on
5215 HTM capable systems. The lock elision code is only enabled with
5216 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
5217 powerpc will issue a transaction abort on every syscall to avoid side
5218 effects being visible outside transactions.
5220 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
5221 AArch64. Contributed by ARM Ltd.
5223 * i386 memcpy functions optimized with SSE2 unaligned load/store.
5225 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
5226 under certain input conditions resulting in the execution of a shell for
5227 command substitution when the application did not request it. The
5228 implementation now checks WRDE_NOCMD immediately before executing the
5229 shell and returns the error WRDE_CMDSUB as expected.
5231 * CVE-2012-3406 printf-style functions could run into a stack overflow when
5232 processing format strings with a large number of format specifiers.
5234 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
5235 infinite loop if the DNS response contained a PTR record of an unexpected
5238 * The minimum GCC version that can be used to build this version of the GNU
5239 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
5240 still be used to compile programs using the GNU C Library.
5242 * The GNU C Library is now built with -Werror by default. This can be
5243 disabled by configuring with --disable-werror.
5245 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
5247 * The obsolete sigvec function has been removed. This was the original
5248 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
5249 programs have been using instead for about 25 years. Of course, ABI
5250 compatibility for old binaries using sigvec remains intact.
5252 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5253 with newer versions of bison.
5255 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5256 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5257 registers overlay two consecutive single-precision registers. MIPS32R2
5258 introduced a new FPU mode (FR=1) where double-precision registers extend the
5259 corresponding single-precision registers which is incompatible with the
5260 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5261 require the use of FR=1 making a transition necessary. New o32 ABI
5262 extensions enable users to migrate over time from the original o32 ABI
5263 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5264 tracks the ABI of any loaded object and verifies that new objects are
5265 compatible. Mode transitions will also be requested as required and
5266 unsupportable objects will be rejected. The ABI checks include both soft and
5267 hard float ABIs for o32, n32 and n64.
5269 GCC 5 with GNU binutils 2.25 onwards:
5270 It is strongly recommended that all o32 system libraries are built using the
5271 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5272 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5273 compiler using --with-fp-32=xx to set this by default.
5277 * The following bugs are resolved with this release:
5279 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5280 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5281 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5282 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5283 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5284 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5285 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5286 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5287 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5288 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5289 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5290 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5291 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5292 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5293 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5295 * Reverted change of ABI data structures for s390 and s390x:
5296 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5297 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5298 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5299 are preserved pointing straight to the same implementation as the old ones.
5300 Given that, new callers will simply provide a too-big buffer to these
5301 functions. Any applications/libraries out there that embed jmp_buf or
5302 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5303 against 2.19 headers will have to rebuilt again. This is necessary in any
5304 case to revert the breakage in their ABI caused by the glibc change.
5306 * Support for file description locks is added to systems running the
5307 Linux kernel. The standard file locking interfaces are extended to
5308 operate on file descriptions, not file descriptors, via the use of
5309 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5310 are associated with an open file instead of a process.
5312 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5314 * The minimum Linux kernel version that this version of the GNU C Library
5315 can be used with is 2.6.32.
5317 * Running the testsuite no longer terminates as soon as a test fails.
5318 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5319 with PASS or FAIL lines for individual tests. A summary of the results is
5320 printed, including a list of failing lists, and "make check" exits with
5321 error status if there were any unexpected failures. "make check
5322 stop-on-test-failure=y" may be used to keep the old behavior.
5324 * The am33 port, which had not worked for several years, has been removed
5327 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5328 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5329 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5330 conflicted with POSIX (support for which was removed in 2.19), the
5331 interfaces those macros enabled remain available when compiling with
5332 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5333 test macros defined.
5335 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5337 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5338 This may improve lock scaling of existing programs on TX capable systems.
5339 The lock elision code is only built with --enable-lock-elision=yes and
5340 then requires a GCC version supporting the TX builtins. With lock elision
5341 default mutexes are elided via __builtin_tbegin, if the cpu supports
5342 transactions. By default lock elision is not enabled and the elision code
5345 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5346 copy the path argument. This allowed programs to cause posix_spawn to
5347 deference a dangling pointer, or use an unexpected pathname argument if
5348 the string was modified after the posix_spawn_file_actions_addopen
5351 * All supported architectures now use the main glibc sysdeps directory
5352 instead of some being in a separate "ports" directory (which was
5353 distributed separately before glibc 2.17).
5355 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5356 On configurations that support it (all Linux configurations), it's now
5357 used regardless of the --enable-add-ons switch to configure. It is no
5358 longer possible to build such configurations without pthreads support.
5360 * Locale names, including those obtained from environment variables (LANG
5361 and the LC_* variables), are more tightly checked for proper syntax.
5362 setlocale will now fail (with EINVAL) for locale names that are overly
5363 long, contain slashes without starting with a slash, or contain ".." path
5364 components. (CVE-2014-0475) Previously, some valid locale names were
5365 silently replaced with the "C" locale when running in AT_SECURE mode
5366 (e.g., in a SUID program). This is no longer necessary because of the
5369 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5370 with application code using Intel MPX instructions. (With all previous
5371 versions, the MPX register state could be clobbered when making calls
5372 into or out of a shared library.) Note that while the new dynamic
5373 linker is compatible with all known x86 hardware whether or not it
5374 supports Intel MPX, some x86 instruction-set emulators might fail to
5375 handle the new instruction encodings. This is known to affect Valgrind
5376 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5377 release), and might affect other tools that do instruction emulation.
5379 * Support for loadable gconv transliteration modules has been removed.
5380 The support for transliteration modules has been non-functional for
5381 over a decade, and the removal is prompted by security defects. The
5382 normal gconv conversion modules are still supported. Transliteration
5383 with //TRANSLIT is still possible, and the //IGNORE specifier
5384 continues to be supported. (CVE-2014-5119)
5386 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5387 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5388 resulting a denial-of-service security vulnerability in applications which
5389 use functions related to iconv. (CVE-2014-6040)
5393 * The following bugs are resolved with this release:
5395 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5396 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5397 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5398 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5399 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5400 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5401 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5402 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5403 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5404 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5405 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5406 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5407 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5408 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5409 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5410 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5411 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5412 16431, 16453, 16474, 16506, 16510, 16529
5414 * Slovenian translations for glibc messages have been contributed by the
5415 Translation Project's Slovenian team of translators.
5417 * The public headers no longer use __unused nor __block. This change is to
5418 support compiling programs that are derived from BSD sources and use
5419 __unused internally, and to support compiling with Clang's -fblock
5420 extension which uses __block.
5422 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5423 large collation sequences to optimize multiple passes. This cache
5424 computation may overflow for large collation sequences and may cause a
5425 stack or buffer overflow. This is now fixed to use a slower algorithm
5426 which does not use a cache if there is an integer overflow.
5428 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5429 rules for large collation sequences to optimize multiple passes and falls
5430 back to alloca if malloc fails, resulting in a possible stack overflow.
5431 The implementation now falls back to an uncached collation sequence lookup
5434 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5435 initialized for static applications resulting in the security feature
5436 being disabled. The pointer guard is now correctly initialized to a
5437 random value for static applications. Existing static applications need
5438 to be recompiled to take advantage of the fix (bug 15754).
5440 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5441 to the d_name member of struct dirent, or omit the terminating NUL
5442 character. (Bugzilla #14699).
5444 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5445 aligned_alloc functions could allocate too few bytes or corrupt the
5446 heap when passed very large allocation size values (Bugzilla #15855,
5449 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5450 for AF_INET6 has been fixed (Bugzilla #16072).
5452 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5453 pap_CW, quz_PE, the_NP.
5455 * Substantially revised locales: gd_GB, ht_HT
5457 * The LC_ADDRESS field was updated to support country_car for almost all
5460 * ISO 1427 definitions were updated.
5462 * ISO 3166 definitions were updated.
5464 * The localedef utility now supports --big-endian and --little-endian
5465 command-line options to generate locales for a different system from that
5466 for which the C library was built.
5468 * Binary locale files now only depend on the endianness of the system for
5469 which they are generated and not on other properties of that system. As a
5470 consequence, binary files generated with new localedef may be incompatible
5471 with old versions of the GNU C Library, and binary files generated with
5472 old localedef may be incompatible with this version of the GNU C Library,
5473 in the following circumstances:
5475 + Locale files may be incompatible on m68k systems.
5477 + Locale archive files (but not separate files for individual locales) may
5478 be incompatible on systems where plain "char" is signed.
5480 * The configure option --disable-versioning has been removed. Builds with
5481 --disable-versioning had not worked for several years.
5483 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5484 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5486 * SystemTap probes for malloc have been introduced.
5488 * SystemTap probes for slow multiple precision fallback paths of
5489 transcendental functions have been introduced.
5491 * Support for powerpc64le has been added.
5493 * The soft-float powerpc port now supports e500 processors.
5495 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5497 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5498 set of header declarations that are enabled by default, even when other
5499 feature test macros or compiler options such as -std=c99 would otherwise
5500 disable some of those declarations.
5502 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5503 conflict with POSIX. The libbsd-compat library (which was a dummy library
5504 that did nothing) has also been removed.
5506 * Preliminary documentation about Multi-Thread, Async-Signal and
5507 Async-Cancel Safety has been added.
5509 * Change of ABI data structures for s390 and s390x:
5510 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5511 allow for future hardware extensions. All library functions that accept or
5512 return these structures were versioned in order to provide backwards
5513 compatibility with existing code. However, not all cases can be handled
5514 with interface versioning. If an application embeds either structure into
5515 another structure and that structure is passed to another compilation unit
5516 which expects the newer larger-sized object then any access to the new
5517 fields will result in undefined behaviour. Similarly any access to fields
5518 that were moved by the enlarging of the structures will cause undefined
5519 behaviour. To fix the undefined behaviour all objects that are part of the
5520 final in-memory image must agree on the size of structures, and this may
5521 require recompilation.
5525 * The following bugs are resolved with this release:
5527 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5528 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5529 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5530 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5531 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5532 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5533 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5534 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5535 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5536 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5537 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5538 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5539 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5542 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5543 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5544 Distributions can re-enable building and using pt_chown via the new configure
5545 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5546 considerable security risks and should only be used if the distribution
5547 understands and accepts the risks.
5549 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5552 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5553 fixed (Bugzilla #15330).
5555 * Add support for calling C++11 thread_local object destructors on thread
5556 and program exit. This needs compiler support for offloading C++11
5557 destructor calls to glibc.
5559 * Improved worst case performance of libm functions with double inputs and
5562 * Support for priority inherited mutexes in pthread condition variables on
5563 non-x86 architectures.
5565 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5567 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5569 * Optimized string functions for ARM. Implemented by Will Newton and
5572 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5574 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5577 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5578 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5580 * Added a benchmark framework to track performance of functions in glibc.
5582 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5583 It is based on draft TS 18661 and currently enabled as a GNU extension.
5585 * On Linux, the clock function now uses the clock_gettime system call
5586 for improved precision, rather than old times system call.
5588 * Added support for version-3 tz format files. This is needed when using
5589 the tz database release 2013e or later, and affects a few unusual cases --
5590 currently only TZ='America/Godthab' for time stamps after 2037.
5592 * Added new API functions pthread_getattr_default_np and
5593 pthread_setattr_default_np to get and set the default pthread
5594 attributes of a process.
5596 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5597 This may improve lock scaling of existing programs on TSX capable systems.
5598 When the --enable-lock-elision=yes parameter is specified at configure
5599 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5602 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5603 availability). Implemented by Ryan S. Arnold.
5605 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5609 * The following bugs are resolved with this release:
5611 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5612 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5613 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5614 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5615 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5616 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5617 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5618 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5619 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5620 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5621 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5622 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5623 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5624 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5625 14879, 14889, 14893, 14898, 14914.
5627 * Optimization of memcpy for MIPS.
5629 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5630 EMFILE has been fixed (Bugzilla #14889).
5632 * The add-on ports collection is now distributed in the "ports" subdirectory
5633 of the main GNU C Library distribution, rather than separately.
5635 * Port to ARM AArch64 contributed by Linaro.
5637 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5638 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5640 Implemented by Andreas Krebbel.
5642 * The new function secure_getenv allows secure access to the environment,
5643 returning NULL if running in a SUID/SGID process. This function replaces
5644 the internal function __secure_getenv.
5646 * SystemTap static probes have been added into the dynamic linker.
5647 Implemented by Gary Benson.
5649 * Optimizations of string functions strstr, strcasestr and memmem.
5650 Implemented by Maxim Kuvyrkov.
5652 * The minimum Linux kernel version that this version of the GNU C Library
5653 can be used with is 2.6.16.
5655 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5656 powerpc POWER7. Implemented by Will Schmidt.
5658 * New configure option --disable-nscd builds the C library such that it
5659 never attempts to contact the Name Service Caching Daemon (nscd).
5660 New configure option --disable-build-nscd avoids building nscd itself;
5661 this is the default if --disable-nscd is used.
5663 * Improved support for cross-compilation, including cross-testing and
5664 bootstrap builds without a previously built glibc.
5666 * Several testsuite tests are now able to test multiple IFUNC variants of an
5667 interface, rather than just testing the one that would be chooen by
5670 * New configure options --with-bugurl and --with-pkgversion, for
5671 distributors to use to embed their bug-reporting and package version
5672 information in --help and --version output.
5674 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5675 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5676 allows creation of chroots without the procfs mounted on /proc.
5678 * The `crypt' function now fails if passed salt bytes that violate the
5679 specification for those values. On Linux, the `crypt' function will
5680 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5681 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5682 when the mode is enabled.
5684 * The `clock_*' suite of functions (declared in <time.h>) is now available
5685 directly in the main C library. Previously it was necessary to link with
5686 -lrt to use these functions. This change has the effect that a
5687 single-threaded program that uses a function such as `clock_gettime' (and
5688 is not linked with -lrt) will no longer implicitly load the pthreads
5689 library at runtime and so will not suffer the overheads associated with
5690 multi-thread support in other code such as the C++ runtime library.
5692 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5697 * The following bugs are resolved with this release:
5699 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5700 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5701 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5702 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5703 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5704 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5705 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5706 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5707 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5708 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5709 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5710 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5711 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5712 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5713 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5714 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5715 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5716 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5717 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5718 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5719 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5720 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5723 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5724 configuring glibc with:
5725 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5726 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5727 Implemented by H.J. Lu.
5731 + define static_assert
5733 + do not declare gets
5735 + declare at_quick_exit and quick_exit also for ISO C11
5737 + aligned_alloc. NB: The code is deliberately allows the size parameter
5738 to not be a multiple of the alignment. This is a moronic requirement
5739 in the standard but it is only a requirement on the caller, not the
5742 + timespec_get added
5744 + uchar.h support added
5746 + CMPLX, CMPLXF, CMPLXL added
5748 Implemented by Ulrich Drepper.
5750 * Support for the IA-64 has been moved to ports.
5752 * Remove support for anything but ELF binary format
5754 * Checking versions of poll, ppoll added.
5755 Implemented by Ulrich Drepper.
5757 * More generic and 64-bit performance optimizations to math functions.
5758 Implemented by Ulrich Drepper.
5760 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5761 headers and functions available at compile time as they were before
5762 version 2.14. This option will be removed at some time in the future
5763 after the TI-RPC library becomes fully sufficient for the needs of
5764 existing applications.
5766 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5767 Note that glibc is not expected to work with any Linux kernel version
5770 * New header <sys/auxv.h> and function getauxval allowing easy access to
5771 the AT_* key-value pairs passed from the Linux kernel. The header also
5772 defines the HWCAP_* bits associated with the AT_HWCAP key.
5774 * New locales: mag_IN
5776 * New configure option --enable-systemtap builds SystemTap static probes
5777 into libc for setjmp and longjmp and into libpthread for various operations.
5778 So far the setjmp/longjmp probes and some of the libpthread probes are
5779 provided only for i*86 and x86_64.
5780 Implemented by Roland McGrath and Rayson Ho.
5782 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5784 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5787 * More optimized functions for SPARC. Implemented by David S. Miller.
5789 * Improved support for cross-compilation, especially bootstrap builds
5790 without a previously built glibc.
5792 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5793 Chris Metcalf from Tilera.
5795 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5796 now supported for ARM processors.
5798 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5799 as the name of the dynamic linker, to distinguish it from the
5800 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5802 * Support for CRIS has been removed from ports.
5804 * A new class of installed header has been documented for low-level
5805 platform-specific functionality. PowerPC added the first instance with a
5806 function to provide time base register access. Contributed by Tulio
5807 Magno Quites Machado Filho.
5809 * ix86 configurations now install header files that are consistent with
5810 what x86-64 configurations install. These same header files can be used
5811 for -m32, -m64, or -mx32 builds.
5812 Contributed by H.J. Lu.
5814 * Math library bug fixes. A thorough audit of all open math library bugs was
5815 conducted by Joseph Myers. Significant progress was made on many math
5816 library bugs resulting in more accurate exceptions and function results.
5817 Many thanks to all those that contributed including Andreas Jaeger for his
5818 patch review and work on the x87 trigonometric instruction issues.
5820 * Timezone data is no longer installed. Timezone-related binaries and scripts
5821 will continue to be installed. Users should obtain their timezone data from
5822 their distribution provider or from the tzdata package at
5823 <ftp://munnari.oz.au/pub/>.
5827 * The following bugs are resolved with this release:
5829 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5830 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5831 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5832 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5833 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5834 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5835 13484, 13506, 13515, 13523, 13524, 13538, 13540
5837 * New program pldd to list loaded object of a process
5838 Implemented by Ulrich Drepper.
5840 * Add nss_db support back to glibc. No more dependency on Berkeley db
5841 and support for initgroups lookups.
5842 Implemented by Ulrich Drepper.
5844 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5845 Contributed by HJ Lu.
5847 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5848 Contributed by HJ Lu.
5850 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5851 on x86-32 and x86-64.
5852 Contributed by Liubov Dmitrieva.
5854 * Optimized strchr and strrchr for SSE on x86-32.
5855 Contributed by Liubov Dmitrieva.
5857 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5858 for x86-64 and x86-32.
5859 Contributed by Liubov Dmitrieva.
5861 * New interfaces: scandirat, scandirat64
5862 Implemented by Ulrich Drepper.
5864 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5865 Implemented by Ulrich Drepper.
5867 * nscd now also caches the netgroup database.
5868 Implemented by Ulrich Drepper.
5870 * Integrate libm with gcc's -ffinite-math-only option.
5871 Implemented by Ulrich Drepper.
5873 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5874 to math functions. Implemented by Ulrich Drepper.
5876 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5877 Implemented by Ulrich Drepper.
5879 * New Linux interfaces: process_vm_readv, process_vm_writev
5881 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5882 Implemented by Ulrich Drepper.
5884 * Optimized nearbyint and strcasecmp for PPC.
5885 Implemented by Adhemerval Zanella.
5887 * New locales: bho_IN, unm_US, es_CU, ta_LK
5891 * The following bugs are resolved with this release:
5893 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5894 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5895 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5896 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5897 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5898 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5899 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5900 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5901 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5902 12795, 12811, 12813, 12814, 12841
5904 * The RPC implementation in libc is obsoleted. Old programs keep working
5905 but new programs cannot be linked with the routines in libc anymore.
5906 Programs in need of RPC functionality must be linked against TI-RPC.
5907 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5909 Visible changes of this change include (obviously) the inability to link
5910 programs using RPC functions without referencing the TI-RPC library and the
5911 removal of the RPC headers from the glibc headers.
5912 Implemented by Ulrich Drepper.
5914 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5915 syncfs, setns, sendmmsg
5917 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5918 yue_HK, lij_IT, mhr_RU
5920 * New encodings: CP770, CP771, CP772, CP773, CP774
5922 * New program sotruss to trace calls through PLTs
5923 Implemented by Ulrich Drepper.
5925 * The malloc hook implementation is marked deprecated and will be removed
5926 from the default implementation in the next version. The design never
5927 worked ever since the introduction of threads. Even programs which do
5928 not create threads themselves can use multiple threads created internally.
5932 * The following bugs are resolved with this release:
5934 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5935 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5936 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5937 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5940 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5942 * POWER7 optimizations: memset, memcmp, strncmp
5944 * New optimized string functions for x86-64: strnlen (SSE2),
5945 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5946 Implemented by Ulrich Drepper.
5950 * The following bugs are resolved with this release:
5952 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5953 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5954 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5955 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5956 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5957 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5958 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5959 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5961 * New interfaces: pthread_getname_np, pthread_setname_np
5963 * New Linux interface: recvmmsg
5965 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5967 * The dynamic linker now recognizes supported ABI versions from the
5968 EI_ABIVERSION field in the ELF header.
5969 Implemented by Ulrich Drepper.
5971 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5972 will not be used to fill in password fields in the passwd.byname replies.
5973 Instead it is used to synthesize the shadow.byname table, should it be
5974 missing. This is a useful mode in some installations involving Solaris.
5975 Implemented by Ulrich Drepper.
5977 * New locales: kok_IN, sq_MK, cv_RU
5981 * The following bugs are resolved with this release:
5983 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5984 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5985 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5986 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5987 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5988 10789, 10817, 10823, 10840, 10847
5990 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5992 Implemented by Ulrich Drepper.
5994 * Checking version of longjmp added that fails if an uninitialized stack
5995 frame would be created. Implemented by Ulrich Drepper.
5997 * STT_GNU_IFUNC is now supported in static executables.
5998 Implemented by H.J. Lu.
6000 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
6002 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
6003 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
6004 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
6005 Contributed by H.J. Lu.
6007 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
6008 Implemented by Ulrich Drepper.
6010 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
6012 Contributed by H.J. Lu.
6014 * Support for fma instruction in AVX on x86-64.
6015 Implemented by H.J. Lu and Ulrich Drepper.
6017 * AVX support in x86-64 auditing support in ld.so.
6018 Implemented by H.J. Lu.
6020 * STB_GNU_UNIQUE support added.
6021 Implemented by Ulrich Drepper.
6023 * Implement second fallback mode for optimized DNS lookup for even more
6024 broken environments. If two requests from the same port are not
6025 handled correctly close the socket and open a new one before sending
6026 the second request. The 'single-request-reopen' option in /etc/resolv.conf
6027 can be used to select this mode right away, instead of rediscovering the
6028 necessity is every process again.
6029 Implemented by Ulrich Drepper.
6031 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
6032 Implemented by Adam Tkac.
6034 * Optimized iconv conversions for S390x.
6035 Implemented by Andreas Krebbel.
6037 * Using condvars with PI mutexes is now more efficient due to kernel
6038 support for requeueing to PI futexes. NPTL support added for x86-64.
6039 Implemented by Ulrich Drepper.
6041 * New locales: ps_AF, my_MM
6045 * The following bugs are resolved with this release:
6047 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
6048 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
6049 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
6050 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
6051 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
6053 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
6054 Implemented by Ulrich Drepper.
6056 * New Linux interfaces: accept4, fallocate, fallocate64.
6057 Implemented by Ulrich Drepper.
6059 * Correct declarations of string function when used in C++ code. This
6060 could lead to compile errors for invalid C++ code.
6062 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
6065 * New POSIX 2008 interface: psiginfo
6066 Implemented by Ulrich Drepper.
6068 * New ISO C++1x interfaces: quick_exit, at_quick_exit
6069 Implemented by Ulrich Drepper.
6071 * Support for selecting between multiple function definitions at runtime
6072 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
6074 * The libcrypt library can now use the hash function implementations in
6075 NSS. Implemented by Ulrich Drepper.
6077 * The malloc implementation can be compiled to be less memory efficient
6078 but higher performing in multi-threaded programs.
6079 Implemented by Ulrich Drepper.
6081 * New locales: nan_TW@latin, ks_IN
6083 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
6084 Implemented by Ulrich Drepper.
6086 * Extended printf hook support. It is possible to use user-defined types
6087 and extend existing format specifiers.
6088 Implemented by Ulrich Drepper.
6090 * Handling for group shadow files has been added.
6091 Implemented by Ulrich Drepper.
6093 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
6094 servers (the case, e.g., for some people using the built-in DNS
6095 server in ADSL modems/routers). There is a once-per-process timeout
6096 in case of a broken server. To avoid it, users can run nscd or put
6097 'options single-request' in /etc/resolv.conf.
6098 Implemented by Ulrich Drepper.
6102 * The following bugs are resolved with this release:
6104 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
6105 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
6106 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
6107 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
6108 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
6110 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
6111 up at the same time. Implemented by Ulrich Drepper.
6113 * TLS descriptors for LD and GD on x86 and x86-64.
6114 Implemented by Alexandre Oliva.
6116 * getaddrinfo now handles DCCP and UDPlite.
6117 Implemented by Ulrich Drepper.
6119 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
6120 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
6121 Implemented by Ulrich Drepper.
6123 * New implementation of memmem, strstr, and strcasestr which is O(n).
6124 Implemented by Eric Blake.
6126 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
6128 * Implement "e" option for popen to open file descriptor with the
6129 close-on-exec flag set. Implemented by Ulrich Drepper.
6131 * Implement "b" mode for fmemopen. In this mode writes writes don't
6132 implicitly add a NUL byte and seeks from the end of the buffer really
6133 use the buffer end, not the string length as the basis.
6134 Implemented by Ulrich Drepper.
6136 * Many functions, exported and internal, now atomically set the close-on-exec
6137 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
6139 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
6141 Implemented by Pravin Satpute.
6143 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
6147 * The following bugs are resolved with this release:
6149 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
6150 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
6151 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
6152 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
6153 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
6154 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
6155 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
6157 * New locales: bo_CN, bo_IN, shs_CA.
6159 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
6161 * Sorting rules for some Indian languages (Devanagari and Gujarati).
6162 Implemented by Pravin Satpute.
6164 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
6166 * nscd caches now all timeouts for DNS entries
6167 Implemented by Ulrich Drepper.
6169 * nscd is more efficient and wakes up less often.
6170 Implemented by Ulrich Drepper.
6172 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
6173 vdprintf, and obstack_vprintf.
6174 Implemented by Jakub Jelinek.
6176 * Faster memset for x86-64.
6177 Implemented by Harsha Jagasia and H.J. Lu.
6179 * Faster memcpy on x86.
6180 Implemented by Ulrich Drepper.
6182 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
6183 Implemented by Ulrich Drepper.
6185 * Faster sqrt and sqrtf implementation for some PPC variants.
6186 Implemented by Steven Munroe.
6190 * The following bugs are resolved with this release:
6192 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
6193 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
6194 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
6195 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
6196 5071, 5103, 5104, 5112, 5113, 5184, 5186
6198 * More checking functions: fread, fread_unlocked, open*, mq_open.
6199 Implemented by Jakub Jelinek and Ulrich Drepper.
6201 * Extend fortification to C++. Implemented by Jakub Jelinek.
6203 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
6204 by not recognizing 'a' as a modifier when those specs are requested.
6205 Implemented by Jakub Jelinek.
6207 * PPC optimizations to math and string functions.
6208 Implemented by Steven Munroe.
6210 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
6211 options to be passed. Implemented by Ulrich Drepper.
6213 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
6215 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
6216 Implemented by Ulrich Drepper.
6218 * Handle private futexes in the NPTL implementation.
6219 Implemented by Jakub Jelinek and Ulrich Drepper.
6221 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
6222 Implemented by Roland McGrath and Ulrich Drepper.
6224 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
6226 * SHA-256 and SHA-512 based password encryption.
6227 Implemented by Ulrich Drepper.
6229 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
6230 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
6233 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
6234 Implemented by Ulrich Drepper.
6238 * The following bugs are resolved with this release:
6240 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
6241 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
6242 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
6243 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
6244 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
6245 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
6246 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
6249 * New Linux interfaces: epoll_pwait, sched_getcpu.
6251 * New generic interfaces: strerror_l.
6253 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6257 * The following bugs are resolved with this release:
6259 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6260 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6261 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6262 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6263 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6264 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6265 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6266 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6267 3225, 3251, 3252, 3253, 3273
6269 * For Linux, the sorting of addresses returned by getaddrinfo now also
6270 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6271 Implemented by Ulrich Drepper.
6273 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6274 Implemented by Ulrich Drepper.
6276 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6278 * New iconv module for MIK. Contributed by Alexander Shopov.
6280 * For sites with broken group and/or passwd database, the auto-propagate
6281 option of nscd can prevent creating ID lookup entries from the results
6282 of a name lookup and vice versa. This usually is no problem but some
6283 site might have problems with the default behavior.
6284 Implemented by Ulrich Drepper.
6286 * Iterating over entire database in NIS can be slow. With the
6287 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6288 to trade time for memory. The entire database will be read at once.
6289 Implemented by Ulrich Drepper.
6291 * The interfaces introduced in RFC 3542 have been implemented by
6294 * Support for the new ELF hash table format was added by Ulrich Drepper.
6296 * Support for priority inheritance mutexes added by Jakub Jelinek and
6299 * Support for priority protected mutexes added by Jakub Jelinek.
6301 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6302 or_IN, csb_PL, fy_NL, sr_ME.
6306 * More overflow detection functions.
6308 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6309 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6311 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6312 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6313 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6314 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6315 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6316 by Masahide Washizawa.
6318 * It is now possible to install audit libraries for the dynamic linker using
6319 LD_AUDIT. Implemented by Ulrich Drepper.
6321 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6322 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6323 For a libc and libpthread that works well on Linux 2.4 kernels, we
6324 recommend using the stable 2.3 branch.
6326 * The new function open_wmemstream acts like open_memstream,
6327 but uses a wchar_t wide character buffer.
6329 * The new function ppoll is an improved version of poll, similar to pselect.
6331 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6332 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6333 renameat, unlinkat, linkat, symlinkat, readlinkat.
6335 * New Linux kernel system calls: unshare,
6336 inotify_init, inotify_add_watch, inotify_rm_watch.
6338 * The euidaccess function is now also known by the alias eaccess,
6339 for compatibility with some other systems.
6341 * Timezone data updated to 2006b version.
6345 * The following bugs are resolved with this release:
6347 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6348 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6349 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6350 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6351 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6352 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6354 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6356 * As of this release, GCC 4 can be used to compile the C Library.
6358 * Timezone data updated to 2005m version.
6362 * The following bugs are resolved with this release:
6364 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6365 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6366 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6367 777, 787, 821, 822, 823, 825
6369 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6373 * Support for RFC 3678. Real implementations exist only for Linux so far.
6374 Implemented by Ulrich Drepper.
6376 * nscd can now cache entries persistently. Expiring entries are reloaded.
6377 For speedups the cache can be shared in memory with client processes.
6378 Implemented by Ulrich Drepper.
6380 * nscd can now perform SELinux checks.
6381 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6383 * getaddrinfo queries are now cached. Canonical name lookup is performed
6385 Implemented by Ulrich Drepper.
6387 * The nothrow function attribute is used when headers are used by gcc when
6388 compiling C code. This can avoid significant amounts of exception
6391 * The malloc functions perform more error checking and are stricter when
6392 it comes to reacting on errors. The default action is to terminate
6393 the process after showing an error message. Implemented by Ulrich Drepper.
6395 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6396 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6398 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6399 namespaces using the new function dlmopen(). This feature is of course,
6400 like most other dynamic loading functionality, not available in statically
6401 linked applications. Implemented by Ulrich Drepper.
6403 * Low-overhead boundary checking variants of string and some stdio functions
6404 were added. These are to be used in conjunction with a gcc patch by
6405 Jakub Jelinek which adds calls to these functions if possible.
6406 Implemented by Jakub Jelinek and Ulrich Drepper.
6408 * Old code for several operating systems and machine architectures that
6409 have not been in working condition in a long time have been removed from
6410 the main source tree maintained by the GNU C Library's maintainers.
6411 These files are now reside in the separate `ports' source module
6412 that is usable as an add-on when building the library.
6416 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6417 interrogate the dynamic linker, compatible with the Solaris interface.
6419 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6420 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6422 * getifaddrs now uses the netlink interface on Linux to get its information.
6423 Implemented by Thorsten Kukuk.
6425 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6426 Implemented by Ulrich Drepper.
6428 * support for non-executable stacks on x86 has been added. Changes mostly
6431 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6434 * getaddrinfo now performs destination address selection according to
6439 * Thread-safe interfaces for many functions that access locale data
6440 were added in version 2.3, but these features were omitted from NEWS.
6441 Many functions have variants with an `_l' suffix that take a `locale_t'
6442 object as a parameter rather than consulting the current locale.
6443 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6444 create and maintain `locale_t' objects. Additionally, the new function
6445 `uselocale' sets "the current locale" (as used by functions not so
6446 parameterized) set for an individual thread. These features were added
6447 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6449 * The functions getresuid, getresgid, setresuid, and setresgid, which
6450 have long been available on Linux, are now declared in <unistd.h>
6451 and are now also available on the Hurd.
6453 * ELF thread-local storage support (TLS) now works on x86-64.
6455 * The new dynamic string token $LIB is expanded in shared library names.
6456 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6458 * Aldy Hernandez contributed complete software floating point support for
6459 PowerPC machines with no FPU.
6461 * fexecve is implemented on Linux.
6463 * The `btowc' function should work at least twice as fast due to
6464 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6466 * With appropriate thread add-ons cancelable functions are now implemented
6467 in libc.so as well. No need to call the function in libpthread. This
6468 change allowed to finally disable the incorrect and expensive handling
6469 of weak definition in ld.so.
6471 * Yet more PLT entries in libc.so have been removed. We finally arrived
6472 at the bare minimum. Startup times improved appropriately.
6474 * Support for the new Linux/x86 system call interface was added. The
6475 AT_SYSINFO auxiliary vector entry is recognized and handled.
6479 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6482 * iconv (the program and the interface) now accepts empty names (excluding
6483 options like //TRANSLIT) to mean "use charset of current locale".
6485 * localedef can now transliterate characters in strings which are not in
6486 the provided charmap. The information from the input locale is used.
6488 * Prelinking support was added for ELF targets. This requires additional
6489 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6491 * Read-only stdio streams now use mmap to speed up operation by eliminating
6492 copying and buffer underflows. To use add 'm' to the mode string of
6493 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6495 * The malloc functions were completely rewritten by Wolfram Gloger based
6496 on Doug Lea's malloc-2.7.0.c.
6498 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6499 implementation of regex.
6501 * Bruno Haible upgraded the iconv and locale implementation to support
6504 * Contents of the LC_* and LANG environment variables in the CEN style are
6505 not recognized anymore. It never was used. Change by Ulrich Drepper.
6507 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6508 thread-local storage (TLS) ABI on some platforms.
6509 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6511 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6512 EUC-JISX0213, and TSCII.
6514 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6515 BSD-compatible interface for getting all network interface addresses.
6516 Implementation for IPv4 by Roland McGrath.
6518 * Loading of locale data is faster due to the introduction of a locale
6519 archive. Implemented by Roland McGrath and Ulrich Drepper.
6521 * Startup times are significantly reduced by not using exported functions
6522 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6525 * Steven Munroe contributed a port to PowerPC64/Linux.
6529 * The Hurd now uses the GNU libio implementation of stdio rather than the
6530 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6532 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6533 with the same behavior as the Linux system call of the same name.
6537 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6538 128-bit long double format.
6540 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6541 IBM1161, and IBM1162 charsets.
6543 * Andreas Jaeger contributed a port to x86-64/Linux.
6545 * Peter Bruin contributed a port to PowerPC/Hurd.
6547 * libc functions using I/O streams now can handle wide-oriented streams
6550 * optimizations in the dynamic linker. Binaries created by recent binutils
6551 versions start up quicker due to reduced time spent on relocations.
6553 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6557 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6558 asinh, atanh, j0 for the 128-bit long double format.
6560 * Bruno Haible updated all the code handling Unicode in some form to
6561 support Unicode 3.1.
6563 * Speed of regex for single-byte locales is back to previous levels.
6564 Patch by Isamu Hasegawa.
6566 * Alpha, SPARC, and IA-64 now also using floating stacks.
6568 * Startup time of internationalized applications greatly improved through
6569 iconv cache. Use iconvconfig to generate the cache file.
6570 Contributed by Ulrich Drepper.
6572 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6573 severe performance problems. Patch by David Mosberger.
6575 * The Hurd port got a lot more functionality like AIO, various stdio
6576 extensions, etc. Mainly done by Roland McGrath.
6578 * mtrace can now lookup symbols in shared libraries.
6582 * Intel's IA-64 math library is largely integrated. It provides fast and
6583 accurate implementatations for most basic and standard math functions
6584 in float, double, and long double format.
6586 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6587 and asin for the 96-bit long double format and asin, log, tan for the
6588 128-bit long double format.
6590 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6591 The basic double functions exist today. Contributed by Abraham Ziv
6592 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6593 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6595 * An asynchronous name lookup library was added. The interface is designed
6596 after POSIX AIO. The proposal was circulated beforehand to get comments.
6597 No negative ones came in. Implemented by Ulrich Drepper.
6599 * Port to S390/64bit contributed by Martin Schwidefsky
6600 <schwidefsky@de.ibm.com>.
6602 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6603 of functions for Linux/IA-64.
6605 * The RPC code is now thread safe. Threads can now use the same service
6606 of different services at the same time. Patch by Eric Norum
6607 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6609 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6610 family of functions for Linux/S390.
6612 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6613 of functions for Linux/x86.
6615 * Port to Linux/CRIS contributed by Axis Communications.
6619 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6620 we can now check for namespace violations and missing declarations. The
6621 result is that almost all headers are now Unix-compliant (as defined in
6622 the upcoming XPG6). The negative side is that some programs might need
6623 corrections, too, if they depend on the incorrect form of the headers in
6624 previous versions which defined too many symbols and included too many
6627 * regex now handles multibyte character sets correctly.
6628 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6630 * iconv (the program) does now conform to the upcoming XPG6 and handles
6631 charmaps. Instead of the charset names the path of charmaps can be
6632 provided and the conversion happens based on this data.
6633 Contributed by Ulrich Drepper.
6635 * The locale program now provides detailed information about the installed
6640 only lists the names of the supported locales
6644 provides details such as country, language, and codeset name.
6645 Contributed by Ulrich Drepper.
6649 * The gencat program now parses the input file according to the charset
6650 selected by the LC_CTYPE category. This is important for stateful
6651 character sets. To make generating catalogs easier there is a way
6652 to overwrite the charset selected by the locale: before the first
6653 message or $ quote line the catalog can contain a line like
6655 $ codeset=ISO-8859-2
6657 to select the charset (ISO-8859-2 in this case).
6659 Implemented by Shinya Hanataka and Ulrich Drepper.
6661 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6662 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6663 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6665 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6666 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6668 * The LANGUAGE environment variable is now ignored unless the locale is
6669 changed from the default "C" locale.
6671 * The usual bug fixes.
6675 * Greg McGary added runtime support for bounds checking using gcc's
6676 new -fbounded-pointers option. ix86 target is complete. PowerPC
6679 * Thorsten Kukuk added secure mode support to nscd.
6681 * The Berkeley db libraries have been removed.
6683 Related, the nss_db module is now in a separate package since it
6684 obviously requires a database library being available.
6686 * Wide character I/O streams implemented by Ulrich Drepper.
6688 * Functions from the extended socket API added by Ulrich Drepper.
6690 * Functions feenableexcept and fedisableexcept to control the
6691 behaviour of individual exceptions have been added by Andreas Jaeger.
6693 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6695 * The resolver code has been updated from bind 8.2.3-T5B which supports
6696 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6699 This change could in some situations effect backward compatibility. Since
6700 now `_res' is a thread-local instead of a global variable, modifying it
6701 in one thread does not have any effect in other threads.
6703 The resolver library was also extended to allow IPv6 as the transport
6704 protocol for the requests. This work was done by Stig Venaas.
6706 * Compatibility code for K&R C compilers has been removed from the
6707 header files. A ISO C compiler is needed to use the library
6708 (conforming to either C89 or C99 standard).
6710 * Complete rewrite of the localedef program to support multibyte character
6711 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6712 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6713 Implemented by Ulrich Drepper.
6715 Bruno Haible significantly improved the generation and use of the data
6716 structures for the wide character tables.
6718 * Plural handling in gettext implemented by Ulrich Drepper.
6720 * The utmp daemon has been removed.
6722 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6724 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6727 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6729 * POSIX barriers implemented by Kaz Kylheku.
6731 * POSIX spawn function family implemented by Ulrich Drepper.
6733 * POSIX spinlocks are now available.
6735 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6737 * the configure option --enable-kernel=X.Y.Z allows to strip out
6738 compatibility for kernel versions before X.Y.Z. This is currently only
6739 implemented for Linux.
6741 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6742 field sin6_scope_id. This means that all programs using IPv6 should be
6743 recompiled. Don't expect binary compatibility with previous glibc
6746 * various conversion modules for IBM character sets contributed by
6749 * IA-64 port by Jes Sorensen and HJ Lu.
6763 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6765 * New xdr functions are added; some rpc functions are now 64bit clean.
6767 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6769 * Fixed known incompatibilities with glibc 2.0.
6771 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6773 * Optimized a number of functions (especially the ELF dynamic loader).
6775 * Update timezone data files.
6777 * lots of charmaps corrections
6779 * some new locale definitions and charmaps
6784 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6785 conform to POSIX member type requirements. Symbol versions have been
6786 adjusted as needed within the library, and for direct use by applications,
6787 but there is potential for problems if third-party libraries use
6788 struct timeval as part of their interface. This does not present
6789 a problem for X and other "essential" system libraries.
6791 * An additional locale model to support C++ Standard Library locale
6792 model and probably more was implemented by Ulrich Drepper.
6794 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6797 * Miles Bader provided the `argp' function family to support hierarchical
6798 command line argument parsing, layered on top of getopt.
6800 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6802 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6805 * scanf recognizes the %a and %A format for scanning floating point numbers.
6807 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6808 information and interfaces for the available integer types.
6810 * about 130 new math functions were added to implement the ISO C9x math
6813 * the new header <complex.h> contains definitions of the complex math
6814 functions from ISO C 9X.
6816 * the new header <tgmath.h> defines generic macros to use complex or
6817 real valued functions.
6819 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6821 * Andreas Jaeger provided a test suite for the math library.
6823 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6825 * Ulrich Drepper added character set conversion functions (iconv).
6827 * Optimized string functions have been added.
6829 * The localedata addon is now part of glibc.
6831 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6833 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6834 daemon for NSS (nscd).
6836 Missing a better place here are some numbers on improvements. Under
6837 Linux 2.1.125 un-tar-ing the kernel sources takes
6841 using local files 12.19s 6.88s 22.91s
6843 using NIS 13.92s 8.91s 26.34s
6845 using NIS & nscd 10.37s 7.34s 25.30s
6847 using NIS+ 27.57s 30.37s 640.46s
6849 using NIS+ & nscd 10.25s 7.83s 26.51s
6851 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6853 Keep in mind that non-namelookup related operations dominate above times.
6854 It was just a common complain that using NIS+ unpacking the kernel is
6857 [1] The old nscd implementation is not available anymore since it was
6858 distributed with glibc up to version 2.0.98 and thus is now replaced.
6860 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6862 * Mark Kettenis provided a Hesiod NSS module.
6864 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6865 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6867 * rcmd can now handle netgroups (Dick Streefland).
6869 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6872 * Support for the IPv6 protocol has been added to the socket API, as per the
6873 latest draft standards.
6875 * Support for Linux 2.2 has been added.
6877 * Interface changes relative to the latest 2.0.x release:
6878 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6879 addseverity NEW: Unix98
6880 alphasort64 NEW: LFS
6881 argp_err_exit_status NEW: argp, GNU ext
6882 argp_error NEW: argp, GNU ext
6883 argp_failure NEW: argp, GNU ext
6884 argp_help NEW: argp, GNU ext
6885 argp_parse NEW: argp, GNU ext
6886 argp_program_bug_address NEW: argp, GNU ext
6887 argp_program_version NEW: argp, GNU ext
6888 argp_program_version_hook NEW: argp, GNU ext
6889 argp_state_help NEW: argp, GNU ext
6890 argp_usage NEW: argp, GNU ext
6891 authdes_create NEW: Secure RPC
6892 authdes_getucred NEW: Secure RPC
6893 authdes_pk_create NEW: Secure RPC
6894 backtrace NEW: GNU ext.
6895 backtrace_symbols NEW: GNU ext.
6896 backtrace_symbols_fd NEW: GNU ext.
6898 cacosf NEW: ISO C 9x
6899 cacosh NEW: ISO C 9x
6900 cacoshf NEW: ISO C 9x
6901 cacoshl NEW: ISO C 9x
6902 cacosl NEW: ISO C 9x
6909 casinf NEW: ISO C 9x
6910 casinh NEW: ISO C 9x
6911 casinhf NEW: ISO C 9x
6912 casinhl NEW: ISO C 9x
6913 casinl NEW: ISO C 9x
6915 catanf NEW: ISO C 9x
6916 catanh NEW: ISO C 9x
6917 catanhf NEW: ISO C 9x
6918 catanhl NEW: ISO C 9x
6919 catanl NEW: ISO C 9x
6920 cbc_crypt NEW: Secure RPC
6924 ccoshf NEW: ISO C 9x
6925 ccoshl NEW: ISO C 9x
6931 cimagf NEW: ISO C 9x
6932 cimagl NEW: ISO C 9x
6933 clearerr_locked REMOVED
6934 clntunix_create NEW: sunrpc ext
6936 clog10 NEW: ISO C 9x
6937 clog10f NEW: ISO C 9x
6938 clog10l NEW: ISO C 9x
6948 cprojf NEW: ISO C 9x
6949 cprojl NEW: ISO C 9x
6951 crealf NEW: ISO C 9x
6952 creall NEW: ISO C 9x
6957 csinhf NEW: ISO C 9x
6958 csinhl NEW: ISO C 9x
6961 csqrtf NEW: ISO C 9x
6962 csqrtl NEW: ISO C 9x
6966 ctanhf NEW: ISO C 9x
6967 ctanhl NEW: ISO C 9x
6969 des_setparity NEW: Secure RPC
6970 ecb_crypt NEW: Secure RPC
6971 endutxent NEW: Unix98
6973 exp10f NEW: ISO C 9x
6974 exp10l NEW: ISO C 9x
6978 fattach NEW: STREAMS
6979 fdetach NEW: STREAMS
6983 feclearexcept NEW: ISO C 9x
6984 fegetenv NEW: ISO C 9x
6985 fegetexceptflag NEW: ISO C 9x
6986 fegetround NEW: ISO C 9x
6987 feholdexcept NEW: ISO C 9x
6989 feraiseexcept NEW: ISO C 9x
6990 ferror_locked REMOVED
6991 fesetenv NEW: ISO C 9x
6992 fesetexceptflag NEW: ISO C 9x
6993 fesetround NEW: ISO C 9x
6994 fetestexcept NEW: ISO C 9x
6995 feupdateenv NEW: ISO C 9x
6996 fflush_locked REMOVED
7000 fgets_unlocked NEW: GNU ext.
7001 fileno_locked REMOVED
7013 fputc_locked REMOVED
7014 fputs_unlocked NEW: GNU ext.
7015 fread_unlocked NEW: GNU ext.
7020 fstatvfs NEW: Unix98
7024 ftruncate64 NEW: LFS
7026 fwrite_unlocked NEW: GNU ext.
7027 gai_strerror NEW: IPv6
7031 getchar_locked REMOVED
7033 getdate_err NEW: Unix98
7034 getdate_r NEW: GNU ext.
7036 getnameinfo NEW: IPv6
7037 getnetname NEW: Secure RPC
7038 getpmsg NEW: STREAMS
7039 getpt NEW: Unix98 PTY
7040 getrlimit64 NEW: LFS
7041 getutxent NEW: Unix98
7042 getutxid NEW: Unix98
7043 getutxline NEW: Unix98
7044 glob64 NEW: GNU ext.
7045 globfree64 NEW: GNU ext.
7046 gnu_get_libc_release NEW: GNU ext.
7047 gnu_get_libc_version NEW: GNU ext.
7048 grantpt NEW: Unix98 PTY
7049 host2netname NEW: Secure RPC
7051 iconv_close NEW: iconv
7052 iconv_open NEW: iconv
7053 if_freenameindex NEW: IPv6
7054 if_indextoname NEW: IPv6
7055 if_nameindex NEW: IPv6
7056 if_nametoindex NEW: IPv6
7057 in6addr_any NEW: IPv6
7058 in6addr_loopback NEW: IPv6
7059 inet6_isipv4mapped NEW: IPv6
7060 isastream NEW: STREAMS
7061 iswblank NEW: GNU ext.
7062 key_decryptsession NEW: Secure RPC
7063 key_decryptsession_pk NEW: Secure RPC
7064 key_encryptsession NEW: Secure RPC
7065 key_encryptsession_pk NEW: Secure RPC
7066 key_gendes NEW: Secure RPC
7067 key_get_conv NEW: Secure RPC
7068 key_secretkey_is_set NEW: Secure RPC
7069 key_setnet NEW: Secure RPC
7070 key_setsecret NEW: Secure RPC
7071 llrint NEW: ISO C 9x
7072 llrintf NEW: ISO C 9x
7073 llrintl NEW: ISO C 9x
7074 llround NEW: ISO C 9x
7075 llroundf NEW: ISO C 9x
7076 llroundl NEW: ISO C 9x
7081 lrintf NEW: ISO C 9x
7082 lrintl NEW: ISO C 9x
7083 lround NEW: ISO C 9x
7084 lroundf NEW: ISO C 9x
7085 lroundl NEW: ISO C 9x
7087 makecontext NEW: Unix98
7088 mempcpy NEW: GNU ext.
7091 modify_ldt NEW: kernel
7095 nearbyint NEW: ISO C 9x
7096 nearbyintf NEW: ISO C 9x
7097 nearbyintl NEW: ISO C 9x
7098 netname2host NEW: Secure RPC
7099 netname2user NEW: Secure RPC
7100 nexttoward NEW: ISO C 9x
7101 nexttowardf NEW: ISO C 9x
7102 nexttowardl NEW: ISO C 9x
7106 passwd2des NEW: Secure RPC
7108 pow10f NEW: GNU ext.
7109 pow10l NEW: GNU ext.
7112 printf_size NEW: GNU ext.
7113 printf_size_info NEW: GNU ext.
7114 profil_counter REMOVED
7115 pthread_mutexattr_getkind_np REPLACED
7116 pthread_mutexattr_setkind_np REPLACED
7117 ptsname NEW: Unix98 PTY
7118 ptsname_r NEW: Unix98 PTY
7120 putchar_locked REMOVED
7121 putgrent NEW: GNU ext.
7123 putpmsg NEW: STREAMS
7124 pututxline NEW: Unix98
7128 readdir64_r NEW: LFS
7129 remquo NEW: ISO C 9x
7130 remquof NEW: ISO C 9x
7131 remquol NEW: ISO C 9x
7133 roundf NEW: ISO C 9x
7134 roundl NEW: ISO C 9x
7136 scalbln NEW: ISO C 9x
7137 scalblnf NEW: ISO C 9x
7138 scalblnl NEW: ISO C 9x
7140 sendfile NEW: kernel
7141 setcontext NEW: Unix98
7142 setrlimit64 NEW: LFS
7143 setutxent NEW: Unix98
7145 sigignore NEW: Unix98
7146 sigqueue NEW: POSIX.1b
7147 sigrelse NEW: Unix98
7148 sigset NEW: POSIX.1b
7149 sigtimedwait NEW: POSIX.1b
7150 sigwaitinfo NEW: POSIX.1b
7151 sincos NEW: GNU ext.
7152 sincosf NEW: GNU ext.
7153 sincosl NEW: GNU ext.
7157 strcasestr NEW: GNU ext.
7158 strtoimax NEW: ISO C 9x
7159 strtoumax NEW: ISO C 9x
7160 strverscmp NEW: GNU ext.
7161 svcauthdes_stats NEW: Secure RPC
7162 svcunix_create NEW: sunrpc etx
7163 svcunixfd_create NEW: sunrpc ext
7164 swapcontext NEW: Unix98
7165 tcgetsid NEW: Unix98 PTY
7166 tdestroy NEW: GNU ext.
7167 tgamma NEW: ISO C 9x
7168 tgammaf NEW: ISO C 9x
7169 tgammal NEW: ISO C 9x
7173 truncf NEW: ISO C 9x
7174 truncl NEW: ISO C 9x
7176 unlockpt NEW: Unix98 PTY
7177 updwtmpx NEW: Unix98
7178 user2netname NEW: Secure RPC
7179 utmpxname NEW: Unix98
7180 versionsort NEW: GNU ext.
7181 versionsort64 NEW: GNU ext.
7183 wcscasecmp NEW: GNU ext.
7184 wcsncasecmp NEW: GNU ext.
7185 wcsnlen NEW: GNU ext.
7186 wcstoimax NEW: ISO C 9x
7187 wcstoll NEW: ISO C 9x
7188 wcstoull NEW: ISO C 9x
7189 wcstoumax NEW: ISO C 9x
7191 wordexp NEW: POSIX.2
7192 wordfree NEW: POSIX.2
7193 write_profiling REMOVED
7194 xdecrypt NEW: Secure RPC
7195 xdr_authdes_cred NEW: Secure RPC
7196 xdr_authdes_verf NEW: Secure RPC
7197 xdr_cryptkeyarg NEW: Secure RPC
7198 xdr_cryptkeyarg2 NEW: Secure RPC
7199 xdr_cryptkeyres NEW: Secure RPC
7200 xdr_getcredres NEW: Secure RPC
7201 xdr_key_netstarg NEW: Secure RPC
7202 xdr_key_netstres NEW: Secure RPC
7203 xdr_keybuf NEW: Secure RPC
7204 xdr_keystatus NEW: Secure RPC
7205 xdr_netnamestr NEW: Secure RPC
7206 xdr_sizeof NEW: Secure RPC
7207 xdr_unixcred NEW: sunrpc ext
7208 xencrypt NEW: Secure RPC
7209 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7220 * inet_ntoa is thread-safe
7222 * updwtmp is moved from libutil to libc
7224 * rewrite of cbrt function
7226 * update of timezone data
7240 * add atoll function
7242 * fix complex problems in Berkeley DB code
7244 * fix math functions
7248 * fixed lots of header problems (especially Linux/GNU specific)
7250 * dynamic loader preserves all registers
7252 * Roland McGrath provided support for handling of auxiliary objects in
7253 the ELF dynamic loader.
7255 * support for parallel builds is improved
7259 * GNU extensions are no longer declared by default. To enable them you
7260 must define the macro `_GNU_SOURCE' in your program or compile with
7263 * The library has changed from using GNU ld symbol aliases to using weak
7264 symbols where available. The ELF object file format supports weak
7265 symbols; GNU ld also supports weak symbols in the a.out format. (There
7266 is also now support for other GNU ld extensions in ELF. Use the
7267 `--with-elf' option to configure to indicate you have ELF, and
7268 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7269 of many files which contained only symbol aliases, reducing the size of
7270 the source and the compiled library; many other files were renamed to
7271 less cryptic names previously occupied by the symbol alias files.
7272 There is a new header file <elf.h> for programs which operate on
7273 files in the ELF format.
7275 * Converted to Autoconf version 2, so `configure' has more options.
7276 Run `configure --help' to see the details.
7278 * The library can now be configured to build profiling, highly-optimized
7279 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7280 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7281 `configure' enable building these extra libraries. The shared library is
7282 built by default when using both ELF and GNU ld. When shared libraries
7283 are enabled, the new library `-ldl' is available for arbitrary run-time
7284 loading of shared objects; its interface is defined in <dlfcn.h>. The
7285 new header file <link.h> gives access to the internals of the run-time
7286 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7287 application of same name on other systems and it provides information
7288 about dynamically linked binaries.
7290 * The C library now provides the run-time support code for profiling
7291 executables compiled with `-pg'. Programs can control the profiling code
7292 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7293 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7294 the support for this file format was contributed by David Mosberger-Tang.
7296 * The math code has been replaced with a math library based on fdlibm from
7297 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7298 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7299 functions. The math functions now reside in a separate library, so
7300 programs using them will need to use `-lm' their linking commands.
7302 * John C. Bowman contributed optimized ix87 assembler inline functions.
7304 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7305 mechanism similar to that found in Solaris 2. This is now used for the
7306 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7307 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7308 file controls what services are used for each individual database. This
7309 works by loading shared libraries with names specified in `nsswitch.conf',
7310 so service modules can be changed or added at any time without even
7311 relinking any program. Currently there are the file, db, and NIS based
7312 NSS services available.
7314 * The new functions `strtoq' and `strtouq' parse integer values from
7315 strings, like `strtol' and `strtoul', but they return `long long int' and
7316 `unsigned long long int' values, respectively (64-bit quantities).
7318 * The new functions `strtof' and `strtold' parse floating-point values from
7319 strings, like `strtod', but they return `float' and `long double' values,
7320 respectively (on some machines `double' and `long double' are the same).
7322 * Ulrich Drepper has contributed new implementations of the floating-point
7323 printing and reading code used in the `printf' family of functions and
7324 `strtod', `strtof', and `strtold'. These new functions are perfectly
7325 accurate, and much faster than the old ones.
7327 * The implementation of the POSIX locale model was completely rewritten by
7328 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7329 to compile the POSIX locale definition.
7331 * The former dummy implementations of the strcoll and strxfrm function are
7332 now replaced by fully functional code contributed by Ulrich Drepper. The
7333 collation information comes from the POSIX locale definitions.
7335 * The new header <langinfo.h> defines an interface for accessing
7336 various locale-dependent data (using the locale chosen with `setlocale').
7338 * Ulrich Drepper has contributed a new suite of functions for operation on
7339 wide-character and multibyte-character strings, in <wchar.h>;
7340 and classification and case conversion of wide characters, in <wctype.h>.
7341 These new functions are conforming to the ISO C, Amendment 1 specification.
7343 * There is now a second implementation of the standard I/O library available.
7344 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7345 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7347 * You can now use positional parameter specifications in format strings
7348 for the `printf' and `scanf' families of functions. For example,
7349 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7350 ``Number 6, Mr Jones''. This is mainly useful when providing different
7351 format strings for different languages, whose grammars may dictate
7352 different orderings of the values being printed. To support this
7353 feature, the interface for `register_printf_handler' has changed; see
7354 the header file <printf.h> for details.
7356 * The `printf' and `scanf' families of functions now understand a new
7357 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7358 to group numbers as indicated by the locale; for `scanf' and friends, this
7359 says to accept as valid only a number with all the proper grouping
7360 separators in the right places. In the default "C" locale, numbers are
7361 not grouped; but locales for specific countries will define the usual
7362 conventions (i.e. separate thousands with `,' in the US locale).
7364 * The pgrp functions have been regularized, slightly incompatibly but much
7365 less confusingly. The core functions are now `getpgid' and `setpgid',
7366 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7367 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7368 provided for compatibility. There is no longer an incompatible `getpgrp'
7369 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7371 * The new header file <fts.h> and suite of functions simplify programs that
7372 operate on directory trees. This code comes from 4.4 BSD.
7374 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7375 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7376 NSS scheme used in glibc.
7378 * There is a new malloc debugging hook `__memalign_hook'.
7380 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7381 `unsigned int' in <sys/types.h>. These are for compatibility only and
7382 their use is discouraged.
7384 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7385 done differently, so that it works even without GNU ld.
7387 * New function `euidaccess' checks allowed access to a file like `access',
7388 but using the effective IDs instead of the real IDs.
7390 * The time zone data files have been updated for the latest and greatest
7391 local time conventions of the countries of the world.
7393 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7396 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7397 for formatting floating-point numbers. They are provided only for
7398 compatibility; new programs should use `sprintf' instead. There are
7399 also equivalent function for the `long double' floating-point type and
7400 all functions also exist in a reentrant form.
7402 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7403 functions for maintaining the login-record files (primarily of use to
7404 system programs such as `login'), and convenient functions for
7405 allocating and initializing a pseudo-terminal (pty) device.
7407 * Ulrich Drepper has contributed new support for System V style
7408 shared memory and IPC on systems that support it.
7410 * Ulrich Drepper has contributed several miscellaneous new functions found
7411 in System V: The `hsearch' family of functions provide an effective
7412 implementation of hash tables; `a64l' and `l64a' provide a very simple
7413 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7416 * Ulrich Drepper has contributed new reentrant counterparts for the
7417 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7419 * Ulrich Drepper has contributed new, highly-optimized versions of several
7420 string functions for the i486/Pentium family of processors.
7422 * Ulrich Drepper has updated the Linux-specific code, based largely
7423 on work done in Hongjiu Lu's version of GNU libc for Linux.
7424 The GNU library now supports Linux versions 2.0.10 and later,
7425 using the ELF object file format (i[3456]86-*-linux).
7427 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7429 * David Mosberger-Tang and Richard Henderson have ported the C library
7430 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7431 dynamic linking support for ELF/Alpha.
7433 * Richard Henderson contributed several Alpha optimized assembler function
7434 for arithmetic and string handling.
7436 * Ulrich Drepper has contributed a new set of message catalog functions to
7437 support multiple languages using the <libintl.h> interface, for use with
7438 his new package GNU gettext. Translation volunteers have contributed
7439 catalogs of the library's messages in Spanish, German, and Korean.
7441 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7442 program and the `catgets' function for reading the catalog files it
7443 creates. (The <libintl.h> interface is preferred; we include the
7444 <nl_types.h> interface using `catgets' only for source compatibility with
7445 programs already written to use it.)
7447 * New header file <values.h> gives SVID-compatible names for <limits.h>
7450 * Various new macros, declarations, and small header files for compatibility
7453 * New function `group_member' is a convenient way to check if a process has
7454 a given effective group ID.
7456 * When using GCC 2.7 and later, the socket functions are now declared in a
7457 special way so that passing an argument of type `struct sockaddr_in *',
7458 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7459 `struct sockaddr *' type, does not generate a type-clash warning.
7461 * New function `error' declared in header file <error.h> is a convenient
7462 function for printing error messages and optionally exiting; this is the
7463 canonical function used in GNU programs. The new functions `err', `warn',
7464 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7465 doing the same thing.
7467 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7468 POSIX.2 `glob' function to do ~ and {...} expansion.
7470 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7471 `clearenv' which is used in POSIX.9 is also available.
7473 * New function `getsid' returns session ID number on systems that support it.
7475 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7476 files <db.h> and <mpool.h> provide a rich set of functions for several
7477 types of simple databases stored in memory and in files, and <ndbm.h> is
7478 an old `ndbm'-compatible interface using the `db' functions. Link with
7479 `-ldb' to get these functions.
7481 * New macro `strdupa' copies a string like `strdup', but uses local stack
7482 space from `alloca' instead of dynamic heap space from `malloc'.
7484 * New function `strnlen' is like `strlen' but searches only a given maximum
7485 number of characters for the null terminator. `stpncpy', `strndup' and
7486 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7489 * New function `statfs' in header <sys/statfs.h>.
7491 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7492 provide convenient functions for operating on blocks of null-terminated
7495 * A new suite of functions in <utmp.h> handle all the details of reading
7496 and writing the utmp file.
7498 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7501 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7502 completely POSIX compliant and also implemented the extended functionality
7503 to handle alternate digit representation and alternate era date formats.
7505 * Ulrich Drepper provided an implementation of the `strptime' function
7506 defined in XPG4.2 which transforms a string into a `struct tm' value.
7508 * Paul Eggert provided the tzselect shell script as part of the timezone
7509 code. The shell script makes it easy to select the correct timezone
7512 * The implementation of the malloc family of functions is completely replaced
7513 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7514 The implementation uses the mmap function (if available) and it is
7515 optimized for the use in multi threaded programs.
7517 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7518 functions. This new functionality is usable by specifying a special
7519 salt string and it is compatible with implementation on *BSD systems.
7521 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7522 `getsubopt' to handle second level command line options, `bsd_signal'
7523 to access BSD style `signal' functionality, the obsolete `regexp' style
7526 * the `lchown' function is available on system which support this
7529 * The implementation of the shadow password handling function was contributed
7532 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7534 * POSIX.1g support was added. The <sys/select.h> header is available,
7535 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7536 implementation of `getaddrinfo'.
7540 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7542 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7543 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7545 * The new function `daemon' from 4.4 BSD is useful for server programs that
7546 want to put themselves in the background.
7548 * Joel Sherrill has contributed support for several standalone boards that
7549 run without an operating system.
7551 * `printf', `scanf' and friends now accept a `q' type modifier for long
7552 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7554 * All of the code taken from BSD (notably most of the math and networking
7555 routines) has been updated from the BSD 4.4-Lite release.
7557 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7559 * The new functions `getdomainname' and `setdomainname' fetch or change the
7560 YP/NIS domain name. These are system calls which exist on systems which
7563 * The time zone data files have been updated for the latest international
7566 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7567 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7571 * The C library now includes support for Sun RPC, from Sun's free
7572 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7573 are included. (There is still no support for YP.)
7575 * Tom Quinn has contributed a port of the C library to SGI machines running
7576 Irix 4 (mips-sgi-irix4).
7578 * The new `lockf' function is a simplified interface to the locking
7579 facilities of `fcntl', included for compatibility.
7581 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7583 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7585 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7588 * The error message printed by `assert' for a failed assertion now includes
7589 the name of the program (if using GNU ld) and the name of the calling
7590 function (with versions of GCC that support this).
7592 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7594 * The library now includes the <sys/mman.h> header file and memory
7595 management functions `mmap', `munmap', `mprotect', `msync', and
7596 `madvise', on systems that support those facilities.
7598 * The interface for `mcheck' has changed slightly: the function called to
7599 abort the program when an allocation inconsistency is detected now takes
7600 an argument that indicates the type of failure. The new function
7601 `mprobe' lets you request a consistency check for a particular block at
7602 any time (checks are normally done only when you call `free' or `realloc'
7605 * It is now possible to easily cross-compile the C library, building on one
7606 system a library to run on another machine and/or operating system. All
7607 you need to do is set the variable `HOST_CC' in `configparms' to the
7608 native compiler for programs to run on the machine you are building on (a
7609 few generator programs are used on Unix systems); set `CC' to the
7612 * The new function `fexecve' (only implemented on the GNU system) executes
7613 a program file given a file descriptor already open on the file.
7617 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7618 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7620 * You can set the variable `libprefix' in `configparms' to specify a prefix
7621 to be prepended to installed library files; this makes it easy to install
7622 the GNU C library to be linked as `-lgnuc' or whatever.
7624 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7625 copies a limited number of characters from a string, and returns the
7626 address of the last character written.
7628 * You no longer need to check for whether the installed `stddef.h' is
7629 compatible with the GNU C library. configure now checks for you.
7631 * You can now define a per-stream `fileno' function to convert the
7632 stream's cookie into an integral file descriptor.
7634 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7635 allocates zero bytes of storage, and returns a unique pointer which
7636 you can pass to `realloc' or `free'. The behavior is undefined if
7637 you dereference this pointer.
7639 * The C library now runs on Sony NEWS m68k machines running either
7640 NewsOS 3 or NewsOS 4.
7642 * The new `syscall' function is a system-dependent primitive function
7643 for invoking system calls. It has the canonical behavior on Unix
7644 systems, including unreliable return values for some calls (such as
7645 `pipe', `fork' and `getppid').
7647 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7648 to `EAGAIN', which is the preferred name. On systems whose kernels
7649 use two distinct codes, the C library now translates EWOULDBLOCK to
7650 EAGAIN in every system call function.
7654 * The GNU C Library Reference Manual is now distributed with the library.
7655 `make dvi' will produce a DVI file of the printed manual.
7656 `make info' will produce Info files that you can read on line using C-h i
7657 in Emacs or the `info' program.
7658 Please send comments on the manual to bug-glibc-manual@gnu.org.
7660 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7662 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7664 * Jason Merrill has contributed a port to the Sequent Symmetry running
7665 Dynix version 3 (i386-sequent-dynix).
7667 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7668 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7670 * New function `memory_warnings' lets you arrange to get warnings when
7671 malloc is running out of memory to allocate, like Emacs gives you.
7673 * The C library now contains the relocating allocator used in Emacs 19 for
7674 its editing buffers. This allocator (ralloc) minimizes allocation
7675 overhead and fragmentation by moving allocated regions around whenever it
7676 needs to. You always refer to a ralloc'd region with a "handle" (a
7677 pointer to a pointer--an object of type `void **').
7679 * There is a new `printf' format: `%m' gives you the string corresponding
7680 to the error code in `errno'.
7682 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7683 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7684 pass, the `a' modifier says to fill in a `char **' you pass with a
7687 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7688 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7689 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7691 * `mkstemp' is a traditional Unix function to atomically create and open a
7692 uniquely-named temporary file.
7696 * The standard location for the file that says what the local timezone is
7697 has changed again. It is now `/usr/local/etc/localtime' (or more
7698 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7700 * The distribution no longer contains any files with names longer than 14
7703 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7704 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7706 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7710 * The configuration process has changed quite a bit. The `configure'
7711 script is now used just like the configuration scripts for other GNU
7712 packages. The `sysdeps' directory hierarchy is much rearranged.
7713 The file `INSTALL' explains the new scheme in detail.
7715 * The header files no longer need to be processed into ANSI C and
7716 traditional C versions. There is just one set of files to install, and
7717 it will work with ANSI or old C compilers (including `gcc -traditional').
7719 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7720 MIPS DECStation running Ultrix 4.
7722 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7723 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7724 made itself into a shared library.
7726 * Yet further improved support for the i386, running 4.3 BSD-like systems
7727 (such as Mach 3 with the Unix single-server), or System V.
7729 * New function `strncasecmp' to do case-insensitive string comparison
7730 with limited length.
7732 * New function `strsep' is a reentrant alternative to `strtok'.
7734 * New functions `scandir' and `alphasort' for searching directories.
7736 * New function `setenv' is a better interface to `putenv'.
7738 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7739 function for traversing a directory tree.
7741 * The GNU obstack package is now also part of the C library.
7742 The new function `open_obstack_stream' creates a stdio stream that
7743 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7744 formatted output directly to an obstack.
7746 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7747 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7749 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7751 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7752 things to your strings.
7754 * There are some new test programs: test-fseek, testmb, and testrand.
7756 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7757 These ports are not finished, but are a good starting place for really
7758 supporting those systems.
7760 * `/etc/localtime' is now the standard location for the file that says what
7761 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7762 This follows the general principle that `/etc' is the place for all local
7763 configuration files.
7765 * The C library header files now use `extern "C"' when used by the C++
7766 compiler, so the C library should now work with C++ code.
7768 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7769 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7772 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7773 function which uses the `merge sort' algorithm, and is said to be
7774 significantly faster than the old GNU `qsort' function. Merge sort is
7775 now the standard `qsort' function. The new algorithm can require a lot
7776 of temporary storage; so, the old sorting function is called when the
7777 required storage is not available.
7779 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7780 provides the Unix `crypt' function, plus some other entry points.
7782 * The code and header files taken from 4.4 BSD have been updated with the
7783 latest files released from Berkeley.
7785 ----------------------------------------------------------------------
7788 Permission is granted to anyone to make or distribute verbatim copies
7789 of this document as received, in any medium, provided that the
7790 copyright notice and this permission notice are preserved,
7791 thus giving the recipient permission to redistribute in turn.
7793 Permission is granted to distribute modified versions
7794 of this document, or of portions of it,
7795 under the above conditions, provided also that they
7796 carry prominent notices stating who last changed them.
7799 version-control: never