1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2023 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 * struct statvfs now has an f_type member, equal to the f_type statfs member;
13 on the Hurd this was always available under a reserved name,
14 and under Linux a spare has been allocated: it was always zero
15 in previous versions of glibc, and zero is not a valid result.
17 Deprecated and removed features, and other changes affecting compatibility:
19 [Add deprecations, removals and changes affecting compatibility here]
21 Changes to build and runtime requirements:
23 * Building on LoongArch requires at a minimum binutils 2.41 for vector
26 Security related changes:
28 [Add security related changes here]
30 The following bugs are resolved with this release:
32 [The release manager will add the list generated by
33 scripts/list-fixed-bugs.py just before the release.]
39 * When C2X features are enabled and the base argument is 0 or 2, the
40 following functions support binary integers prefixed by 0b or 0B as
41 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
42 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
43 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
44 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
45 following functions support binary integers prefixed by 0b or 0B as
46 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
47 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
48 functions also support the %b format for binary integers, with or
49 without such a prefix and independent of standards mode.
51 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
54 * printf-family functions now support the wN format length modifiers for
55 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
56 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
57 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
58 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
59 specified in draft ISO C2X.
61 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
62 Transparent Huge Pages (THP) in stack allocation at pthread_create.
64 * Support for x86_64 running on Hurd has been added. This port requires
65 as least binutils 2.40 and GCC 13:
69 * Vector math library libmvec support has been added to AArch64. It
70 requires GCC version >= 10.1.0. It can be disabled via
71 "--disable-mathvec", however that is not a supported configuration as
72 it changes the ABI. The symbol names follow the AArch64 vector ABI,
73 they are declared in math.h and have to be called manually at this point.
75 * The strlcpy and strlcat functions have been added. They are derived
76 from OpenBSD, and are expected to be added to a future POSIX version.
78 * A new configure option, "--enable-fortify-source", can be used to build the
79 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
80 provided, or is set to the highest value supported by the compiler. If not
81 explicitly enabled, then fortify source is forcibly disabled so to keep
82 original behavior unchanged.
84 Deprecated and removed features, and other changes affecting compatibility:
86 * libcrypt is no longer built by default; one may use the "--enable-crypt"
87 option to build libcrypt. libcrypt is likely to be removed from the
88 GNU C Library in a future release, so it is recommended that
89 applications port away from it to an alternative such as libxcrypt.
91 * In the Linux kernel for the hppa/parisc architecture some of the
92 MADV_XXX constants were changed to have the same values as the other
93 architectures. New programs compiled with this glibc version and which
94 use the madvise call will require at least Linux kernel version 6.2,
95 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
96 5.4.228, 4.19.270 or 4.14.303.
98 * The "--disable-experimental-malloc" option is no longer available. The
99 per-thread cache can still be disabled per-application using tunables
100 (glibc.malloc.tcache_count set to zero).
102 * The configure option "--enable-tunables" has been removed. The tunable
103 feature is now always enabled.
105 Changes to build and runtime requirements:
107 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
110 Security related changes:
112 CVE-2023-25139: When the printf family of functions is called with a
113 format specifier that uses an <apostrophe> (enable grouping) and a
114 minimum width specifier, the resulting output could be larger than
115 reasonably expected by a caller that computed a tight bound on the
116 buffer size. The resulting larger than expected output could result
117 in a buffer overflow in the printf family of functions.
119 The following bugs are resolved with this release:
121 [178] string: Please add strlcpy and strlcat (attached)
122 [14697] nptl: Behavior of exit is nonconformant with respect to
124 [15142] stdio: Missing locking in _IO_cleanup
125 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
126 [18906] stdio: fopen: ccs value may affect open mode
127 [24466] stdio: Feature request: provide special printf formats for
129 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
130 [28519] libc: system and popen should pass "--" between /bin/sh and
132 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
133 [29591] string: wcsnlen length can overflow in page cross case.
134 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
135 [30068] stdio: incorrect printf output for integers with thousands
136 separator and width field (CVE-2023-25139)
137 [30111] time: support_descriptors_list fails after 2038 on 32 bits
139 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
140 symlink for libraries without soname
141 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
143 [30156] time: Potential ntp_gettime abi break
144 [30235] libc: Missing fallback in getlogin if loginuid is unset
145 [30258] dynamic-link: sprof cannot read and display shared object
146 profiling data correctly
147 [30263] libc: Add test coverage for abs(), labs(), and llabs().
148 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
149 [30402] libc: FAIL: elf/tst-glibcelf
150 [30425] dynamic-link: Symbol lookup during dlclose may fail
152 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
153 [30477] libc: [RISCV]: time64 does not work on riscv32
154 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
156 [30527] network: resolv_conf lock not unlocked on allocation failure
157 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
159 [30555] string: strerror can incorrectly return NULL
160 [30579] malloc: trim_threshold in realloc lead to high memory usage
161 [30662] nscd: Group and password cache use errno in place of errval
167 * The getent tool now supports the --no-addrconfig option. The output of
168 getent with --no-addrconfig may contain addresses of families not
169 configured on the current host i.e. as-if you had not passed
170 AI_ADDRCONFIG to getaddrinfo calls.
172 Deprecated and removed features, and other changes affecting compatibility:
174 * The dynamic linker no longer loads shared objects from the "tls"
175 subdirectories on the library search path or the subdirectory that
176 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
177 search mechanism, which was deprecated in version 2.33.
179 Security related changes:
181 CVE-2022-39046: When the syslog function is passed a crafted input
182 string larger than 1024 bytes, it reads uninitialized memory from the
183 heap and prints it to the target log file, potentially revealing a
184 portion of the contents of the heap.
186 The following bugs are resolved with this release:
188 [12154] network: Cannot resolve hosts which have wildcard aliases
189 [12165] libc: readdir: Do not skip entries with zero d_ino values
190 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
191 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
192 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
193 AF_INET6 address (ie docker)
194 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
196 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
197 [28937] dynamic-link: New DSO dependency sorter does not put new map
199 [29249] libc: csu/libc-tls.c:202: undefined reference to
200 `_startup_fatal_not_constant'
201 [29305] network: Inefficient buffer space usage in nss_dns for
202 gethostbyname and other functions
203 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
204 [29402] nscd: nscd: No such file or directory
205 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
207 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
208 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
210 [29463] math: math/test-float128-y1 fails on x86_64
211 [29485] build: Make hangs when the test misc/tst-pidfile returns
213 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
215 [29499] build: Check failed on misc/tst-glibcsyscalls while building
216 for RISCV64 on a unmatched hardware
217 [29501] build: Check failed on stdlib/tst-strfrom while building for
218 RISCV64 on a unmatched hardware
219 [29502] libc: alpha sys/acct.h out of date
220 [29514] build: Need to use -fPIE not -fpie
221 [29528] dynamic-link: __libc_early_init not called after dlmopen that
223 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
224 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
226 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
228 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
230 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
231 [29576] build: librtld.os: in function `_dl_start_profile':
232 (.text+0x9444): undefined reference to `strcpy'
233 [29578] libc: Definition of SUN_LEN() is wrong
234 [29583] build: iconv failures on 32bit platform due to missing large
236 [29600] dynamic-link: dlmopen hangs after loading certain libraries
237 [29604] localedata: Update locale data to Unicode 15.0.0
238 [29605] nscd: Regression in NSCD backend of getaddrinfo
239 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
241 [29611] string: Optimized AVX2 string functions unconditionally use
243 [29624] malloc: errno is not cleared when entering main
244 [29638] libc: stdlib: arc4random fallback is never used
245 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
247 [29698] build: Configuring for AArch32 on ARMv8+ disables
249 [29727] locale: __strtol_internal out-of-bounds read when parsing
251 [29730] libc: broken y2038 support in fstatat on MIPS N64
252 [29746] libc: ppoll() does not switch to __ppoll64 when
253 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
254 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
255 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
256 aux.S: No such file or directory)
257 [29864] libc: __libc_start_main() should obtain program headers
258 address (_dl_phdr) from the auxv, not the ELF header.
259 [29951] time: daylight variable not set correctly if last DST change
260 coincides with offset change
261 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
262 length in fortify mode
268 * Support for DT_RELR relative relocation format has been added to
269 glibc. This is a new ELF dynamic tag that improves the size of
270 relative relocations in shared object files and position independent
271 executables (PIE). DT_RELR generation requires linker support for
272 -z pack-relative-relocs option, which is supported for some targets
273 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
275 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
276 have been added. The pidfd functionality provides access to a process
277 while avoiding the issue of PID reuse on traditional Unix systems.
279 * On Linux, the process_madvise function has been added. It has the
280 same functionality as madvise but alters the target process identified
283 * On Linux, the process_mrelease function has been added. It allows a
284 caller to release the memory of a dying process. The release of the
285 memory is carried out in the context of the caller, using the caller's
286 CPU affinity, and priority with CPU usage accounted to the caller.
288 * The “no-aaaa” DNS stub resolver option has been added. System
289 administrators can use it to suppress AAAA queries made by the stub
290 resolver, including AAAA lookups triggered by NSS-based interfaces
291 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
292 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
293 produce IPv6 addresses, and configured IPv6 name servers are still
294 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
295 are translated to A queries. The new resolver option is intended
296 primarily for diagnostic purposes, to rule out that AAAA DNS queries
297 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
298 validation by applications.
300 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
301 and mount_setattr have been added. They are part of the new Linux kernel
302 mount APIs that allow applications to more flexibly configure and operate
303 on filesystem mounts. The new mount APIs are specifically designed to work
306 * localedef now accepts locale definition files encoded in UTF-8.
307 Previously, input bytes not within the ASCII range resulted in
308 unpredictable output.
310 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
311 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
312 Support for the char8_t typedef has been added per the ISO C2X N2653
313 proposal. The functions are declared in uchar.h in C2X mode or when the
314 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
315 The char8_t typedef is declared in uchar.h in C2X mode or when the
316 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
317 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
319 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
320 added. The functions wrap getrandom and/or /dev/urandom to return high-
321 quality randomness from the kernel.
323 * Support for LoongArch running on Linux has been added. This port requires
324 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
327 - loongarch64-linux-gnu
329 The LoongArch ABI is 64-bit little-endian.
331 Deprecated and removed features, and other changes affecting compatibility:
333 * Support for prelink will be removed in the next release; this includes
334 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
335 variables and their functionality in the dynamic loader.
337 * The Linux kernel version check has been removed along with the
338 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
339 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
340 when libc.so is issued directly.
342 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
344 The following bugs are resolved with this release:
346 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
347 return different result with versioned "foo"
348 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
350 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
351 ./exe and ld.so adjusts argv on the stack
352 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
354 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
355 consuming the second byte of certain double byte characters
356 [25812] stdio: Libio vtable protection is sometimes only partially
358 [27054] libc: pthread_atfork handlers that call pthread_atfork
360 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
362 [28128] build: declare_symbol_alias doesn't work for assembly codes
363 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
364 [28752] nss: Segfault in getpwuid when stat fails
365 [28815] libc: realpath should not copy to resolved buffer on error
366 [28828] stdio: fputwc crashes
367 [28838] libc: FAIL: elf/tst-p_align3
368 [28845] locale: ld-monetary.c should be updated to match ISO C and
370 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
372 [28852] libc: getaddrinfo leaks memory with AI_ALL
373 [28853] libc: tst-spawn6 changes current foreground process group
374 (breaks test isolation)
375 [28857] libc: FAIL: elf/tst-audit24a
376 [28860] build: --enable-kernel=5.1.0 build fails because of missing
377 __convert_scm_timestamps
378 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
379 inaccurate without /sys and /proc
380 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
382 [28880] libc: Program crashes if date beyond 2038
383 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
384 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
385 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
386 rtm variants when avoiding overflow
387 [28922] build: The .d dependency files aren't always generated
388 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
390 [28936] build: nm: No such file
391 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
392 [28953] nss: NSS lookup result can be incorrect if function lookup
394 [28970] math: benchtest: libmvec benchmark doesn't build with make
396 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
397 /sys/devices/system/cpu/possible
398 [28993] libc: closefrom() iterates until max int if no access to
400 [28996] libc: realpath fails to copy partial result to resolved buffer
402 [29027] math: [ia64] fabs fails with sNAN input
403 [29029] nptl: poll() spuriously returns EINTR during thread
404 cancellation and with cancellation disabled
405 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
406 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
407 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
408 is promoted to global scope
409 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
410 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
411 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
413 [29097] time: fchmodat does not handle 64 bit time_t for
415 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
417 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
418 [29162] string: [PATCH] string.h syntactic error:
419 include/bits/string_fortified.h:110: error: expected ',' or ';'
420 before '__fortified_attr_access'
421 [29165] libc: [Regression] broken argv adjustment
422 [29187] dynamic-link: [regression] broken argv adjustment for nios2
423 [29193] math: sincos produces a different output than sin/cos
424 [29197] string: __strncpy_power9() uses uninitialised register vs18
425 value for filling after \0
426 [29203] libc: daemon is not y2038 aware
427 [29204] libc: getusershell is not 2038 aware
428 [29207] libc: posix_fallocate fallback implementation is not y2038
430 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
431 [29209] libc: isfdtype is not y2038 aware
432 [29210] network: ruserpass is not y2038 aware
433 [29211] libc: __open_catalog is not y2038 aware
434 [29213] libc: gconv_parseconfdir is not y2038 aware
435 [29214] nptl: pthread_setcanceltype fails to set type
436 [29225] network: Mistyped define statement in socket/sys/socket.h in
438 [29274] nptl: __read_chk is not a cancellation point
439 [29279] libc: undefined reference to `mbstowcs_chk' after
440 464d189b9622932a75302290625de84931656ec0
441 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
442 correct for !__ASSUME_TIME64_SYSCALLS
443 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
444 missing on microblaze with largefile
450 * Unicode 14.0.0 Support: Character encoding, character type info, and
451 transliteration tables are all updated to Unicode 14.0.0, using
452 generator scripts contributed by Mike FABIAN (Red Hat).
454 * Bump r_version in the debugger interface to 2 and add a new field,
455 r_next, support multiple namespaces.
457 * Support for the C.UTF-8 locale has been added to glibc. The locale
458 supports full code-point sorting for all valid Unicode code points. A
459 limitation in the framework for fnmatch, regexec, and regcomp requires
460 a compromise to save space and only ASCII-based range expressions are
461 supported for now (see bug 28255). The full size of the locale is
462 only ~400KiB, with 346KiB coming from LC_CTYPE information for
463 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
464 in various downstream distributions. The locale is not built into
465 glibc, and must be installed.
467 * <math.h> functions that round their results to a narrower type, and
468 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
469 18661-3:2015 and draft ISO C2X:
471 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
472 fMxsqrtfN and fMxsqrtfNx functions.
474 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
477 * <math.h> functions for floating-point maximum and minimum,
478 corresponding to new operations in IEEE 754-2019, and corresponding
479 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
480 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
481 fminimum_mag, fminimum_mag_num and corresponding functions for float,
482 long double, _FloatN and _FloatNx.
484 * <math.h> macros for single-precision float constants are added as a
485 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
486 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
489 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
490 predefined as specified in TS 18661-1:2014.
492 * The exp10 functions in <math.h> now have a corresponding type-generic
495 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
497 * printf-family functions now support the %b format for output of
498 integers in binary, as specified in draft ISO C2X, and the %B variant
499 of that format recommended by draft ISO C2X.
501 * A new DSO sorting algorithm has been added in the dynamic linker that uses
502 topological sorting by depth-first search (DFS), solving performance issues
503 of the existing sorting algorithm when encountering particular circular
504 object dependency cases.
506 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
507 the two DSO sorting algorithms. The default setting of '2' uses the
508 new DFS-based algorithm. The setting '1' switches to the old
509 algorithm used in glibc 2.33 and earlier.
511 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
512 to be used by compilers for optimizing usage of 'memcmp' when its
513 return value is only used for its boolean status.
515 * Support for automatically registering threads with the Linux rseq
516 system call has been added. This system call is implemented starting
517 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
518 operations on per-cpu data. It allows user-space to perform updates
519 on per-cpu data without requiring heavy-weight atomic operations.
520 Automatically registering threads allows all libraries, including
521 libc, to make immediate use of the rseq support by using the
522 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
523 variables. The GNU C Library manual has details on integration of
524 Restartable Sequences.
526 * A symbolic link to the dynamic linker is now installed under
527 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
529 * All programs and the testsuite in glibc are now built as position independent
530 executables (PIE) by default on toolchains and architectures that support it.
531 Further, if the toolchain and architecture supports it, even static programs
532 are built as PIE and the resultant glibc can be used to build static PIE
533 executables. A new option --disable-default-pie has been added to disable
534 this behavior and get a non-PIE build. This option replaces
535 --enable-static-pie, which no longer has any effect on the build
538 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
539 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
540 or to use huge pages directly with mmap calls with the MAP_HUGETLB
541 flags). The former can improve performance when Transparent Huge Pages
542 is set to 'madvise' mode while the latter uses the system reserved
545 * The printf family of functions now handles the flagged %#m conversion
546 specifier, printing errno as an error constant (similar to strerrorname_np).
548 * The function _dl_find_object has been added. In-process unwinders
549 can use it to efficiently locate unwinding information for a code
552 * Support for OpenRISC running on Linux has been added. This port requires
553 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
558 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
559 64-bit file offsets (LFS default).
561 * A new configure option, --with-rtld-early-cflags, can be used to
562 specify additional compiler flags for building the early startup code
563 of the dynamic linker. On targets which have CPU compatibility
564 checks, this can help to ensure that proper diagnostics are printed if
565 the dynamic loader runs on an incompatible CPU.
567 * On Linux, the epoll_pwait2 function has been added. It is similar to
568 epoll_wait with the difference the timeout has nanoseconds resolution.
570 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
571 enabling posix_spawn and posix_spawnp to set the controlling terminal in
572 the new process in a race free manner. This function is a GNU extension.
574 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
575 applications compiling with glibc and gcc 12 and later. Level 3 leverages
576 the __builtin_dynamic_object_size function to deliver additional
577 fortification balanced against additional runtime cost (checking non-constant
580 * The audit libraries will avoid unnecessary slowdown if it is not required
581 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
583 Deprecated and removed features, and other changes affecting compatibility:
585 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
586 has been removed since the first PT_LOAD segment is no longer executable
587 due to defaulting to -z separate-code.
589 * The r_version update in the debugger interface makes the glibc binary
590 incompatible with GDB binaries built without the following commits:
592 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
593 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
595 when audit modules or dlmopen are used.
597 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
599 * The --enable-static-pie option is no longer available. The glibc build
600 configuration script now automatically detects static-pie support in the
601 toolchain and architecture and enables it if available.
603 * The catchsegv script and associated libSegFault.so shared object have
604 been removed. There are widely-deployed out-of-process alternatives for
605 catching coredumps and backtraces.
607 * Support for prelink will be removed in the next release; this includes
608 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
609 variables and their functionality in the dynamic loader.
611 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
612 functionality to obtain the program mapping address can be achieved by
613 using LD_TRACE_LOADED_OBJECTS to value of 2.
615 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
616 support prelink PIE binaries.
618 Changes to build and runtime requirements:
620 * The audit module interface version LAV_CURRENT is increased to enable
621 proper bind-now support. The loader now advertises via the la_symbind
622 flags that PLT trace is not possible. New audit modules require the
623 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
624 modules are still loaded for all targets except aarch64.
626 * The audit interface on aarch64 is extended to support both the indirect
627 result location register (x8) and NEON Q register. Old audit modules are
628 rejected by the loader. Audit modules must be rebuilt to use the newer
629 structure sizes and the latest module interface version for LAV_CURRENT.
631 Security related changes:
633 CVE-2022-23219: Passing an overlong file name to the clnt_create
634 legacy function could result in a stack-based buffer overflow when
635 using the "unix" protocol. Reported by Martin Sebor.
637 CVE-2022-23218: Passing an overlong file name to the svcunix_create
638 legacy function could result in a stack-based buffer overflow.
640 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
641 function could result in a memory leak and potential access of
642 uninitialized memory. Reported by Qualys.
644 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
645 function may result in an off-by-one buffer underflow and overflow
646 when the current working directory is longer than PATH_MAX and also
647 corresponds to the / directory through an unprivileged mount
648 namespace. Reported by Qualys.
650 The following bugs are resolved with this release:
652 [12889] nptl: Race condition in pthread_kill
653 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
654 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
655 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
657 [15333] libc: Use 64-bit stat functions in installed programs
658 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
660 [15971] dynamic-link: No interface for debugger access to libraries
662 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
663 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
664 deeply nested DSO dependencies.
665 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
666 ID whose lifetime has not ended
667 [22542] network: buffer overflow in sunrpc clnt_create
669 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
671 [25947] malloc: memory leak in muntrace
672 [26045] math: fmaxf(inf, nan) does not always work
673 [26108] math: exp10() has problems with <tgmath.h>
674 [26779] build: benign use after realloc at localealias.c:329
675 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
676 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
677 [27945] build: build-many-glibcs.py doesn't configure GCC with
678 --enable-initfini-array
679 [27991] build: x86: sysdeps/x86/configure.ac breaks when
680 libc_cv_include_x86_isa_level is loaded from cache
681 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
682 in __REDIRECT_NTH macro
683 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
684 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
686 [28126] libc: nftw aborts for paths longer than PATH_MAX
687 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
688 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
690 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
691 [28185] math: Inaccurate j0f function (again)
692 [28199] locale: iconvconfig prefix flag behaves differently in glibc
694 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
695 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
697 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
698 [28223] libc: mips: clone does not align stack
699 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
701 [28256] malloc: Conditional jump or move depends on uninitialised
702 value(s) in __GI___tunables_init
703 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
704 spawn5 fail if stray fds are open
705 [28310] libc: Do not use affinity mask for sysconf
706 (_SC_NPROCESSORS_CONF)
707 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
709 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
711 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
712 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
714 [28353] network: Race condition on __opensock
715 [28357] dynamic-link: deadlock between pthread_create and ctors
716 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
717 [28361] nptl: Fix for bug 12889 causes setxid deadlock
718 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
719 [28390] localedata: Update locale data to Unicode 14.0.0
720 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
722 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
724 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
725 to tgkill (getpid (), gettid())
726 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
727 [28457] dynamic-link: Missing reldepmod4.so dependency for
729 [28469] time: linux: struct timex is not correctly set for 32-bit
730 systems with TIMESIZE=64
731 [28470] regex: Buffer read overrun in regular expression searching
732 [28475] string: Incorrect access attribute on memfrob
733 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
734 spurious NUL character on state reset
735 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
737 [28550] dynamic-link: FAIL: tst-dso-
738 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
740 [28554] build: Undefined generate-md5
741 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
743 [28607] nptl: Masked signals are delivered on thread exit
744 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
745 lack of cpu counting /proc fallback with glibc 2.34
746 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
747 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
748 [28648] dynamic-link: Running ld.so on statically linked binaries
750 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
752 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
753 [28678] nptl: nptl/tst-create1 hangs sporadically
754 [28688] dynamic-link: PT_LOAD p_align check is too strict
755 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
757 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
758 timezones generated by tzcode-2021d and later
759 [28713] math: GCC 12 miscompiles libm
760 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
761 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
762 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
763 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
764 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
765 Assertion `GL(dl_rtld_map).l_libname' failed!
766 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
767 [28757] nptl: GDB printer tests failed with new GDB
768 [28765] math: x86_64 libmvec atan2 accuracy
769 [28766] manual: Document libmvec accuracy
770 [28768] network: Buffer overflow in svcunix_create with long pathnames
772 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
774 [28770] libc: Unexpected return value from realpath() for too long
775 results (CVE-2021-3998)
776 [28771] libc: %ebx optimization macros are incompatible with .altmacro
778 [28780] build: --disable-default-pie doesn't work on static programs
779 [28782] libc: x86-64 ISA level for glibc itself is always
781 [28792] glob: possible wrong behaviour with patterns with double [
783 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
784 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
785 empty mon_decimal_point_wc
792 * In order to support smoother in-place-upgrades and to simplify
793 the implementation of the runtime all functionality formerly
794 implemented in the libraries libpthread, libdl, libutil, libanl has
795 been integrated into libc. New applications do not need to link with
796 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
797 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
798 provided, so that the linker options keep working. Applications which
799 have been linked against glibc 2.33 or earlier continue to load the
800 corresponding shared objects (which are now empty). The integration
801 of those libraries into libc means that additional symbols become
802 available by default. This can cause applications that contain weak
803 references to take unexpected code paths that would only have been
804 used in previous glibc versions when e.g. preloading libpthread.so.0,
805 potentially exposing application bugs.
807 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
808 PTHREAD_STACK_MIN is no longer constant and is redefined to
809 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
810 sets for modern architectural features like Arm SVE.
812 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
813 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
814 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
815 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
816 dynamic sized register sets for modern architectural features like
819 * The dynamic linker implements the --list-diagnostics option, printing
820 a dump of information related to IFUNC resolver operation and
821 glibc-hwcaps subdirectory selection.
823 * On Linux, the function execveat has been added. It operates similar to
824 execve and it is is already used to implement fexecve without requiring
825 /proc to be mounted. However, different than fexecve, if the syscall is not
826 supported by the kernel an error is returned instead of trying a fallback.
828 * The ISO C2X function timespec_getres has been added.
830 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
831 C2X, is supported to enable declarations of functions defined in Annex F
832 of C2X. Those declarations are also enabled when
833 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
834 defined, and when _GNU_SOURCE is defined.
836 * On powerpc64*, glibc can now be compiled without scv support using the
837 --disable-scv configure option.
839 * Add support for 64-bit time_t on configurations like x86 where time_t
840 is traditionally 32-bit. Although time_t still defaults to 32-bit on
841 these configurations, this default may change in future versions.
842 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
843 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
844 only enabled for Linux and the full support requires a minimum kernel
847 * The main gconv-modules file in glibc now contains only a small set of
848 essential converter modules and the rest have been moved into a supplementary
849 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
850 in the same GCONV_PATH. Similarly, external converter modules directories
851 may have supplementary configuration files in a gconv-modules.d directory
852 with names ending with .conf to logically classify the converter modules in
855 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
856 to configure the size of the thread stack cache.
858 * The function _Fork has been added as an async-signal-safe fork replacement
859 since Austin Group issue 62 dropped the async-signal-safe requirement for
860 fork (and it will be included in the future POSIX standard). The new _Fork
861 function does not run any atfork function neither resets any internal state
862 or lock (such as the malloc one), and only sets up a minimal state required
863 to call async-signal-safe functions (such as raise or execve). This function
864 is currently a GNU extension.
866 * On Linux, the close_range function has been added. It allows efficiently
867 closing a range of file descriptors on recent kernels (version 5.9).
869 * The function closefrom has been added. It closes all file descriptors
870 greater than or equal to a given integer. This function is a GNU extension,
871 although it is also present in other systems.
873 * The posix_spawn_file_actions_addclosefrom_np function has been added,
874 enabling posix_spawn and posix_spawnp to close all file descriptors greater
875 than or equal to a given integer. This function is a GNU extension,
876 although Solaris also provides a similar function.
878 * When invoked explicitly, the dynamic linker now uses the kernel to
879 execute programs that do not have any dynamic dependency (that is,
880 they are statically linked). This feature is Linux-specific.
882 Deprecated and removed features, and other changes affecting compatibility:
884 * The function pthread_mutex_consistent_np has been deprecated; programs
885 should use the equivalent standard function pthread_mutex_consistent
888 * The function pthread_mutexattr_getrobust_np has been deprecated;
889 programs should use the equivalent standard function
890 pthread_mutexattr_getrobust instead.
892 * The function pthread_mutexattr_setrobust_np has been deprecated;
893 programs should use the equivalent standard function
894 pthread_mutexattr_setrobust instead.
896 * The function pthread_yield has been deprecated; programs should use
897 the equivalent standard function sched_yield instead.
899 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
901 * Various rarely-used functions declared in <resolv.h> and
902 <arpa/nameser.h> have been deprecated. Applications are encouraged to
903 use dedicated DNS processing libraries if applicable. For <resolv.h>,
904 this affects the functions dn_count_labels, fp_nquery, fp_query,
905 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
906 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
907 p_type, putlong, putshort, res_hostalias, res_isourserver,
908 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
909 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
910 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
911 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
913 * Various symbols previously defined in libresolv have been moved to libc
914 in order to prepare for libresolv moving entirely into libc (see earlier
915 entry for merging libraries into libc). The symbols __dn_comp,
916 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
917 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
918 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
919 __res_search, __res_send formerly in libresolv have been renamed and no
920 longer have a __ prefix. They are now available in libc.
922 * The pthread cancellation handler is now installed with SA_RESTART and
923 pthread_cancel will always send the internal SIGCANCEL on a cancellation
924 request. It should not be visible to applications since the cancellation
925 handler should either act upon cancellation (if asynchronous cancellation
926 is enabled) or ignore the cancellation internal signal. However there are
927 buggy kernel interfaces (for instance some CIFS versions) that could still
928 see a spurious EINTR error when cancellation interrupts a blocking syscall.
930 * Previously, glibc installed its various shared objects under versioned
931 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
932 were provided as symbolic links. Starting with glibc 2.34, the shared
933 objects are installed under their ABI sonames directly, without
934 symbolic links. This increases compatibility with distribution
935 package managers that delete removed files late during the package
936 upgrade or downgrade process.
938 * The symbols mallwatch and tr_break are now deprecated and no longer used in
939 mtrace. Similar functionality can be achieved by using conditional
940 breakpoints within mtrace functions from within gdb.
942 * The __morecore and __after_morecore_hook malloc hooks and the default
943 implementation __default_morecore have been removed from the API. Existing
944 applications will continue to link against these symbols but the interfaces
945 no longer have any effect on malloc.
947 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
948 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
949 disabled by default in the main C library. Users looking to use these
950 features now need to preload a new debugging DSO libc_malloc_debug.so to get
951 this functionality back.
953 * The deprecated functions malloc_get_state and malloc_set_state have been
954 moved from the core C library into libc_malloc_debug.so. Legacy applications
955 that still use these functions will now need to preload libc_malloc_debug.so
956 in their environment using the LD_PRELOAD environment variable.
958 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
959 __memalign_hook and __free_hook are now removed from the API. Compatibility
960 symbols are present to support legacy programs but new applications can no
961 longer link to these symbols. These hooks no longer have any effect on glibc
962 functionality. The malloc debugging DSO libc_malloc_debug.so currently
963 supports hooks and can be preloaded to get this functionality back for older
964 programs. However this is a transitional measure and may be removed in a
965 future release of the GNU C Library. Users may port away from these hooks by
966 writing and preloading their own malloc interposition library.
968 Changes to build and runtime requirements:
970 * On Linux, the shm_open, sem_open, and related functions now expect the
971 file shared memory file system to be mounted at /dev/shm. These functions
972 no longer search among the system's mount points for a suitable
973 replacement if /dev/shm is not available.
975 Security related changes:
977 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
978 a request for netgroup lookup, may crash due to a double-free,
979 potentially resulting in degraded service or Denial of Service on the
980 local system. Reported by Chris Schanzle.
982 CVE-2021-33574: The mq_notify function has a potential use-after-free
983 issue when using a notification type of SIGEV_THREAD and a thread
984 attribute with a non-default affinity mask.
986 CVE-2021-35942: The wordexp function may overflow the positional
987 parameter number when processing the expansion resulting in a crash.
988 Reported by Philippe Antoine.
990 The following bugs are resolved with this release:
992 [4737] libc: fork is not async-signal-safe
993 [5781] math: Slow dbl-64 sin/cos/sincos for special values
994 [10353] libc: Methods for deleting all file descriptors greater than
995 given integer (closefrom)
996 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
997 name containing multi-byte character(s)
998 [14469] math: Inaccurate j0f function
999 [14470] math: Inaccurate j1f function
1000 [14471] math: Inaccurate y0f function
1001 [14472] math: Inaccurate y1f function
1002 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1004 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1005 crashes if it fails dlsym() twice
1006 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1007 [16063] nptl: Provide a pthread_once variant in libc directly
1008 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1009 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1010 [17183] manual: description of ENTRY struct in <search.h> in glibc
1012 [18435] nptl: pthread_once hangs when init routine throws an exception
1013 [18524] nptl: Missing calloc error checking in
1014 __cxa_thread_atexit_impl
1015 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1016 pthread_create and dlopen
1017 [19366] nptl: returning from a thread should disable cancellation
1018 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1019 when non-root user changes priority
1020 [20802] dynamic-link: getauxval NULL pointer dereference after static
1022 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1023 [22057] malloc: malloc_usable_size is broken with mcheck
1024 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1026 [23323] libc: [RFE] CSU startup hardening.
1027 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1029 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1030 $PLATFORM, $ORIGIN) crashes
1031 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1032 [23554] nptl: pthread_getattr_np reports wrong stack size with
1034 [24106] libc: Bash interpreter in ldd script is taken from host
1035 [24773] dynamic-link: dlerror in an secondary namespace does not use
1036 the right free implementation
1037 [25036] localedata: Update collation order for Swedish
1038 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1039 shm_open to pick wrong directory
1040 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1041 crash in IFUNC resolver due to stack canary (--enable-stack-
1043 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1044 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1045 [27111] dynamic-link: pthread_create and tls access use link_map
1046 objects that may be concurrently freed by dlclose
1047 [27132] malloc: memusagestat is linked to system librt, leading to
1048 undefined symbols on major version upgrade
1049 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1051 [27249] libc: libSegFault.so does not output signal number properly
1052 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1054 [27318] dynamic-link: glibc fails to load binaries when built with
1055 -march=sandybridge: CPU ISA level is lower than required
1056 [27343] nss: initgroups() SIGSEGVs when called on a system without
1057 nsswich.conf (in a chroot)
1058 [27346] dynamic-link: x86: PTWRITE feature check is missing
1059 [27389] network: NSS chroot hardening causes regressions in chroot
1061 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1062 [27444] libc: sysconf reports unsupported option (-1) for
1063 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1064 [27462] nscd: double-free in nscd (CVE-2021-27645)
1065 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1066 malloc/tst-malloc-thread-fail
1067 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1068 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1070 [27522] glob: glob, glob64 incorrectly marked as __THROW
1071 [27555] dynamic-link: Static tests fail with --enable-stack-
1073 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1074 information for the current directory
1075 [27577] dynamic-link: elf/ld.so --help doesn't work
1076 [27605] libc: tunables can't control xsave/xsavec selection in
1077 dl_runtime_resolve_*
1078 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1079 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1081 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1082 _nss_files_getcanonname_r) from within a dlmopen namespace.
1083 [27648] libc: FAIL: misc/tst-select
1084 [27650] stdio: vfscanf returns too early if a match is longer than
1086 [27651] libc: Performance regression after updating to 2.33
1087 [27655] string: Wrong size calculation in string/test-strnlen.c
1088 [27706] libc: select fails to update timeout on error
1089 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1090 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1091 tries resolving them lazily
1092 [27744] nptl: Support different libpthread/ld.so load orders in
1094 [27749] libc: Data race __run_exit_handlers
1095 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1097 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1098 exceeds maximum object size 2147483647
1099 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1101 [27872] build: Obsolete configure option --enable-stackguard-
1103 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1104 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1105 [27892] libc: powerpc: scv ABI error handling fails to check
1107 [27896] nptl: mq_notify does not handle separately allocated thread
1108 attributes (CVE-2021-33574)
1109 [27901] libc: TEST_STACK_ALIGN doesn't work
1110 [27902] libc: The x86-64 clone wrapper fails to align child stack
1111 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1112 [27939] libc: aarch64: clone does not align the stack
1113 [27968] libc: s390x: clone does not align the stack
1114 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1115 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1116 with n >= 0x80000000
1117 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1118 thread never allocated anything
1119 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1120 [28064] string: x86_64:wcslen implementation list has wcsnlen
1121 [28067] libc: FAIL: posix/tst-spawn5
1122 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1123 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1125 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1126 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1127 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1129 [28091] network: ns_name_skip may return 0 for domain names without
1137 * The dynamic linker accepts the --list-tunables argument which prints
1138 all the supported tunables. This option is disable if glibc is
1139 configured with tunables disabled (--enable-tunables=no).
1141 * The dynamic linker accepts the --argv0 argument and provides opportunity
1142 to change argv[0] string.
1144 * The dynamic linker loads optimized implementations of shared objects
1145 from subdirectories under the glibc-hwcaps directory on the library
1146 search path if the system's capabilities meet the requirements for
1147 that subdirectory. Initially supported subdirectories include
1148 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1149 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1150 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1151 subdirectory names correspond to the vendor-independent x86-64
1152 microarchitecture levels defined in the x86-64 psABI supplement.
1154 * The new --help option of the dynamic linker provides usage and
1155 information and library search path diagnostics.
1157 * The mallinfo2 function is added to report statistics as per mallinfo,
1158 but with larger field widths to accurately report values that are
1159 larger than fit in an integer.
1161 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1163 * Support for the RISC-V ISA running on Linux has been expanded to run on
1164 32-bit hardware. This is supported for the following ISA and ABI pairs:
1170 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1173 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1174 glibc may use additional checks that may have an additional performance
1175 overhead. At present these checks are available only on LLVM 9 and later.
1176 The latest GCC available at this time (10.2) does not support this level of
1179 Deprecated and removed features, and other changes affecting compatibility:
1181 * The mallinfo function is marked deprecated. Callers should call
1184 * When dlopen is used in statically linked programs, alternative library
1185 implementations from HWCAP subdirectories are no longer loaded.
1186 Instead, the default implementation is used.
1188 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1189 removed. To support old binaries, the vtimes function continues to exist
1190 as a compatibility symbol. Applications should use the getrlimit or
1193 * Following a change in the tzdata 2018a release upstream, the zdump
1194 program is now installed in the /usr/bin subdirectory. Previously,
1195 the /usr/sbin subdirectory was used.
1197 * On s390(x), the type float_t is now derived from the macro
1198 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1199 hardcoded to double. This does not affect the ABI of any libraries
1200 that are part of the GNU C Library, but may affect the ABI of other
1201 libraries that use this type in their interfaces. The new definition
1202 improves consistency with compiler behavior in many scenarios.
1204 * A future version of glibc will stop loading shared objects from the
1205 "tls" subdirectories on the library search path, the subdirectory that
1206 corresponds to the AT_PLATFORM system name, and also stop employing
1207 the legacy AT_HWCAP search mechanism. Applications should switch to
1208 the new glibc-hwcaps mechanism instead; if they do not do that, only
1209 the baseline version (directly from the search path directory) will be
1212 Changes to build and runtime requirements:
1214 * On Linux, the system administrator needs to configure /dev/pts with
1215 the intended access modes for pseudo-terminals. glibc no longer
1216 attempts to adjust permissions of terminal devices. The previous glibc
1217 defaults ("tty" group, user read/write and group write) already
1218 corresponded to what most systems used, so that grantpt did not
1219 perform any adjustments.
1221 * On Linux, the posix_openpt and getpt functions no longer attempt to
1222 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1223 (and pseudo-terminals are supported), a devpts file system is mounted
1224 on /dev/pts. Current systems already meet these requirements.
1226 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1228 Security related changes:
1230 CVE-2021-3326: An assertion failure during conversion from the
1231 ISO-20220-JP-3 character set using the iconv function has been fixed.
1232 This assertion was triggered by certain valid inputs in which the
1233 converted output contains a combined sequence of two wide characters
1234 crossing a buffer boundary. Reported by Tavis Ormandy.
1236 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1237 invoked with input containing redundant shift sequences in the IBM1364,
1238 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1240 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1241 when invoked with UCS4 input containing an invalid character.
1243 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1244 invoked with EUC-KR input containing invalid multibyte input sequences.
1246 The following bugs are resolved with this release:
1248 [10635] libc: realpath portability patches
1249 [16124] dynamic-link: ld.so should allow to change argv[0]
1250 [17924] malloc: 'free' should not set errno
1251 [18683] libc: Linux faccessat implementation can incorrectly ignore
1253 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1254 [23091] hurd: missing waitid support
1255 [23249] libc: Epyc and other current AMD CPUs do not select the
1256 "haswell" platform subdirectory
1257 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1259 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1261 [24941] libc: Make grantpt usable after multi-threaded fork in more
1263 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1264 [24973] locale: iconv encounters segmentation fault when converting
1265 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1266 [25399] string: undefined reference to `__warn_memset_zero_len' when
1267 changing gnuc version
1268 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1270 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1272 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1273 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1274 [26100] libc: Race in syslog(3) with regards to tag printing.
1275 [26124] libc: Export <cpu-features.h>
1276 [26130] nscd: Inconsistent nscd cache during pruning
1277 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1278 [26224] locale: iconv hangs when converting some invalid inputs from
1279 several IBM character sets (CVE-2020-27618)
1280 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1281 too much stack space
1282 [26343] manual: invalid documented return type for strerrorname_np(),
1283 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1284 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1286 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1288 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1289 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1291 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1292 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1293 [26555] string: strerrorname_np does not return the documented value
1294 [26592] libc: pointer arithmetic overflows in realpath
1295 [26600] network: Transaction ID collisions cause slow DNS lookups in
1297 [26606] libc: [2.33 Regression] pselect is broken on x32
1298 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1299 [26620] glob: fnmatch with collating symbols results in segmentation
1301 [26625] libc: [2.33 Regression] CET is disabled
1302 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1303 at the end of a memory mapping
1304 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1305 by the caller to the kernel
1306 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1307 [26647] build: [-Werror=array-parameter=] due to different
1308 declarations for __sigsetjmp
1309 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1311 [26649] stdio: printf should handle non-normal x86 long double numbers
1312 gracefully (CVE-2020-29573)
1313 [26686] build: -Warray-parameter instances building with GCC 11
1314 [26687] build: -Warray-bounds instances building with GCC 11
1315 [26690] stdio: Aliasing violation in __vfscanf_internal
1316 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1317 [26726] build: GCC warning calling new_composite_name with an array of
1319 [26736] libc: FAIL: misc/tst-sysvshm-linux
1320 [26737] libc: Random FAIL: rt/tst-shm
1321 [26791] libc: Missing O_CLOEXEC in sysconf.c
1322 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1324 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1326 [26818] string: aarch64: string tests may run ifunc variants that are
1328 [26821] libc: Memory leak test failures on Fedora 33
1329 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1330 FSGSBASE/LM/RDRAND check failure
1331 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1333 [26853] libc: aarch64: Missing unwind information in statically linked
1335 [26923] locale: Assertion failure in iconv when converting invalid
1336 UCS4 (CVE-2020-29562)
1337 [26926] dynamic-link: aarch64: library dependencies are not bti
1339 [26932] libc: sh: Multiple floating point functions defined as stubs
1341 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1343 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1345 [27002] build: libc_freeres_fn build failure with GCC 11
1346 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1347 [27008] dynamic-link: ld.so.cache should have endianness markup
1348 [27042] libc: [alpha] anonymous union in struct stat confuses
1350 [27053] libc: Conformance regression in system(3) (and probably also
1352 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1354 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1355 [27083] libc: Unsafe unbounded alloca in addmntent
1356 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1358 [27130] string: "rep movsb" performance issue
1359 [27150] libc: alpha: wait4() is unavailable in static linking
1360 [27177] dynamic-link:
1361 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1363 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1364 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1365 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1366 related to combining characters (CVE-2021-3326)
1373 * Unicode 13.0.0 Support: Character encoding, character type info, and
1374 transliteration tables are all updated to Unicode 13.0.0, using
1375 generator scripts contributed by Mike FABIAN (Red Hat).
1377 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1379 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1380 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1381 Three ABIs are supported:
1387 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1388 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1390 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1391 DT_DEPAUDIT dynamic section entries of the main executable.
1393 * powerpc64le supports IEEE128 long double libm/libc redirects when
1394 using -mabi=ieeelongdouble to compile C code on supported GCC
1395 toolchains. It is recommended to use GCC 8 or newer when testing
1398 * To help detect buffer overflows and other out-of-bounds accesses
1399 several APIs have been annotated with GCC 'access' attribute. This
1400 should help GCC 10 issue better warnings.
1402 * On Linux, functions pthread_attr_setsigmask_np and
1403 pthread_attr_getsigmask_np have been added. They allow applications
1404 to specify the signal mask of a thread created with pthread_create.
1406 * The GNU C Library now provides the header file <sys/single_threaded.h>
1407 which declares the variable __libc_single_threaded. Applications are
1408 encouraged to use this variable for single-thread optimizations,
1409 instead of weak references to symbols historically defined in
1412 * The functions sigabbrev_np and sigdescr_np have been added. The
1413 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1414 SIGHUP) while sigdescr_np returns a string describing the signal number
1415 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1416 attempt to translate the return description, both functions return
1417 NULL for an invalid signal number.
1419 They should be used instead of sys_siglist or sys_sigabbrev and they
1420 are both thread and async-signal safe. These functions are GNU extensions.
1422 * The functions strerrorname_np and strerrordesc_np have been added. The
1423 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1424 while strerrordesc_np returns a string describing the error number
1425 (e.g "Invalid argument" for EINVAL). Different than strerror,
1426 strerrordesc_np does not attempt to translate the return description, both
1427 functions return NULL for an invalid error number.
1429 They should be used instead of sys_errlist and sys_nerr, both are
1430 thread and async-signal safe. These functions are GNU extensions.
1432 * AArch64 now supports standard branch protection security hardening
1433 in glibc when it is built with a GCC that is configured with
1434 --enable-standard-branch-protection (or if -mbranch-protection=standard
1435 flag is passed when building both GCC target libraries and glibc,
1436 in either case a custom GCC is needed). This includes branch target
1437 identification (BTI) and pointer authentication for return addresses
1438 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1439 extensions respectively for the protection to be effective,
1440 otherwise the used instructions are nops. User code can use PAC-RET
1441 without libc support, but BTI requires a libc that is built with BTI
1442 support, otherwise runtime objects linked into user code will not be
1445 Deprecated and removed features, and other changes affecting compatibility:
1447 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1448 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1449 RPC header files. Backward compatibility for old programs is kept
1450 only for architectures and ABIs that have been added in or before
1451 glibc 2.31. New programs need to use TI-RPC
1452 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1453 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1455 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1456 as shared library for backward compatibility and the NSS modules "nis"
1457 and "nisplus" are not built at all and libnsl's headers aren't
1458 installed. This compatibility is kept only for architectures and ABIs
1459 that have been added in or before version 2.28. Replacement
1460 implementations based on TI-RPC, which additionally support IPv6, are
1461 available from <https://github.com/thkukuk/>. This change does not
1462 affect the "compat" NSS module, which does not depend on libnsl
1463 since 2.27 and thus can be used without NIS.
1465 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1466 removed. To support old binaries, the sysctl function continues to
1467 exist as a compatibility symbol (on those architectures which had it),
1468 but always fails with ENOSYS. This reflects the removal of the system
1469 call from all architectures, starting with Linux 5.5.
1471 * The sstk function is no longer available to newly linked binaries.
1472 Its implementation always returned with a failure, and the function
1473 was not declared in any header file.
1475 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1476 sigrelse, sigignore and sigset, and the sigmask macro have been
1477 deprecated. Applications should use the sigsuspend, sigprocmask and
1478 sigaction functions instead.
1480 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1481 already supported this format for almost 20 years.
1483 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1484 are no longer available to newly linked binaries, and their declarations
1485 have been removed from <string.h>. They are exported solely as
1486 compatibility symbols to support old binaries. All programs should use
1489 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1490 are no longer available to newly linked binaries, and their declarations
1491 have been removed from <stdio.h>. They are exported solely as
1492 compatibility symbols to support old binaries. All programs should use
1493 strerror or strerror_r instead.
1495 * Both strerror and strerror_l now share the same internal buffer in the
1496 calling thread, meaning that the returned string pointer may be invalided
1497 or contents might be overwritten on subsequent calls in the same thread or
1498 if the thread is terminated. It makes strerror MT-safe.
1500 * Using weak references to libpthread functions such as pthread_create
1501 or pthread_key_create to detect the singled-threaded nature of a
1502 program is an obsolescent feature. Future versions of glibc will
1503 define pthread_create within libc.so.6 itself, so such checks will
1504 always flag the program as multi-threaded. Applications should check
1505 the __libc_single_threaded variable declared in
1506 <sys/single_threaded.h> instead.
1508 * The "files" NSS module no longer supports the "key" database (used for
1509 secure RPC). The contents of the /etc/publickey file will be ignored,
1510 regardless of the settings in /etc/nsswitch.conf. (This method of
1511 storing RPC keys only supported the obsolete and insecure AUTH_DES
1512 flavor of secure RPC.)
1514 * The __morecore and __after_morecore_hook malloc hooks and the default
1515 implementation __default_morecore have been deprecated. Applications
1516 should use malloc interposition to change malloc behavior, and mmap to
1517 allocate anonymous memory. A future version of glibc may require that
1518 applications which use the malloc hooks must preload a special shared
1519 object, to enable the hooks.
1521 * The hesiod NSS module has been deprecated and will be removed in a
1522 future version of glibc. System administrators are encouraged to
1523 switch to other approaches for networked account databases, such as
1526 Changes to build and runtime requirements:
1528 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1529 long double redirects.
1531 Security related changes:
1533 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1534 invoked with the -c option and when processing invalid multi-byte input
1535 sequences. Reported by Jan Engelhardt.
1537 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1538 corruption when they were passed a pseudo-zero argument. Reported by Guido
1539 Vranken / ForAllSecure Mayhem.
1541 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1542 expanding ~user has been fixed.
1544 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1545 memmove functions has been fixed. Discovered by Jason Royes and Samual
1546 Dytrych of the Cisco Security Assessment and Penetration Team (See
1549 The following bugs are resolved with this release:
1551 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1552 [10441] manual: Backtraces code example lacks error checking
1553 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1554 timer_sigev_thread dangerous
1555 [14231] stdio: stdio-common tests memory requirements
1556 [14578] libc: /proc-based emulation for lchmod, fchmodat
1557 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1558 filtee has constructor
1559 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1560 sequences (CVE-2016-10228)
1561 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1562 character entities for infinity & pi
1563 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1564 segfaults in applications
1565 [20543] libc: Please move from .gnu.linkonce to comdat
1566 [22489] network: gcc warns about implicit conversion in
1567 ICMP6_FILTER_SETPASS with -Wsign-conversion
1568 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1569 [23294] math: Complex _FloatN functions are redirected to the wrong
1570 function with -mlong-double-64
1571 [23296] libc: Data race in setting function descriptor during lazy
1573 [23668] dynamic-link: ldconfig: Default to the new format for
1575 [23819] hurd: hurd: Add C11 thread support
1576 [23990] build: test-container error out on failure to exec child.
1577 [23991] build: shell-container typo in run_command_array
1578 [24638] manual: Error in example of parsing a template string
1579 [24654] manual: Wrong declaration of wcschr in libc manual
1580 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1582 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1583 dynamically loaded dsos
1584 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1585 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1587 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1588 restore EAX, ECX and EDX
1589 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1590 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1591 [25420] network: Race condition in resolv_conf.c can result in caching
1592 stale configuration forever
1593 [25487] math: sinl() stack corruption from crafted input
1595 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1597 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1598 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1600 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1601 on 32 bit and old kernel
1602 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1603 [25639] localedata: Some names of days and months wrongly spelt in
1605 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1606 amount of sigset_t bytes
1607 [25691] stdio: printf: memory leak when printing long multibyte
1609 [25715] libc: system() returns wrong errors when posix_spawn fails
1610 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1611 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1612 state for conversions that produce two Unicode code points
1613 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1614 for linux x86_64 leads to livelock
1615 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1616 test failures, invalid instruction in ld.so
1617 [25790] glob: Typo in tst-fnmatch.input
1618 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1620 [25819] localedata: Update locale data to Unicode 13.0.0
1621 [25824] libc: Abnormal function of strnlen in aarch64
1622 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1623 [25896] libc: Incorrect prctl
1624 [25902] libc: Bad LOADARGS_N
1625 [25905] dynamic-link: VSX registers are corrupted during PLT
1626 resolution when glibc is built with --disable-multi-arch and --with-
1628 [25933] string: Off by one error in __strncmp_avx2 when
1629 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1631 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1632 exiting detached thread
1633 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1635 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1637 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1638 [26073] math: getpayload() has wrong return value
1639 [26076] dynamic-link: dlmopen crashes after failing to load
1640 dependencies in audit mode
1641 [26120] localedata: column width of of some Korean
1642 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1643 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1644 [26133] libc: Incorrect need_arch_feature_F16C
1645 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1647 [26149] libc: PKU is usable only if OSPKE is set
1648 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1650 [26208] libc: Incorrect bit_cpu_CLFSH
1651 [26210] network: Incorrect use of hidden symbols for global sunrpc
1653 [26211] stdio: printf integer overflow calculating allocation size
1654 [26214] stdio: printf_fp double free
1655 [26215] stdio: printf_fp memory leak
1656 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1657 [26258] nss: nss_compat should not read input files with mmap
1658 [26332] string: Incorrect cache line size load causes memory
1659 corruption in memset
1666 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1667 enable features from the draft ISO C2X standard. Only some features from
1668 this draft standard are supported by the GNU C Library, and as the draft
1669 is under active development, the set of features enabled by this macro is
1670 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1671 by compiling with "gcc -std=gnu2x".
1673 * The <math.h> functions that round their results to a narrower type now
1674 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1675 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1676 Clarification Request 13 to TS 18661-3.
1678 * The function pthread_clockjoin_np has been added, enabling join with a
1679 terminated thread with a specific clock. It allows waiting against
1680 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1682 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1684 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1685 in queries if the trust-ad option is set via the options directive in
1686 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1687 mode, the AD bit, as provided by the name server, is available to
1688 applications which call res_search and related functions. In the default
1689 mode, the AD bit is not set in queries, and it is automatically cleared in
1690 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1691 servers and the network path to them are treated as untrusted.)
1693 Deprecated and removed features, and other changes affecting compatibility:
1695 * The totalorder and totalordermag functions, and the corresponding
1696 functions for other floating-point types, now take pointer arguments to
1697 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1698 passing. This is in accordance with the resolution of Clarification
1699 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1700 floating-point arguments directly will continue to work.
1702 * The obsolete function stime is no longer available to newly linked
1703 binaries, and its declaration has been removed from <time.h>.
1704 Programs that set the system time should use clock_settime instead.
1706 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1707 in a future version of glibc. In this release, the header still exists
1708 but calling ftime will cause a compiler warning. All programs should use
1709 gettimeofday or clock_gettime instead.
1711 * The gettimeofday function no longer reports information about a
1712 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1713 many years, as it cannot handle the full complexity of the world's
1714 timezones, but hitherto we have supported it on a best-effort basis.
1715 Changes required to support 64-bit time_t on 32-bit architectures have
1716 made this no longer practical.
1718 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1719 should expect to receive a 'struct timezone' whose tz_minuteswest and
1720 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1721 happen on a few Linux-based ports. This will be corrected in a future
1724 All callers should supply a null pointer for the 'tzp' argument to
1725 gettimeofday. For accurate information about the time zone associated
1726 with the current time, use the localtime function.
1728 gettimeofday itself is obsolescent according to POSIX. We have no plans
1729 to remove access to this function, but portable programs should consider
1730 using clock_gettime instead.
1732 * The settimeofday function can still be used to set a system-wide time
1733 zone when the operating system supports it. This is because the Linux
1734 kernel reused the API, on some architectures, to describe a system-wide
1735 time-zone-like offset between the software clock maintained by the kernel,
1736 and the "RTC" clock that keeps time when the system is shut down.
1738 However, to reduce the odds of this offset being set by accident,
1739 settimeofday can no longer be used to set the time and the offset
1740 simultaneously. If both of its two arguments are non-null, the call
1741 will fail (setting errno to EINVAL).
1743 Callers attempting to set this offset should also be prepared for the call
1744 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1745 some Linux architectures. The Linux kernel maintainers are discussing a
1746 more principled replacement for the reused API. After a replacement
1747 becomes available, we will change settimeofday to fail with ENOSYS on all
1748 platforms when its 'tzp' argument is not a null pointer.
1750 settimeofday itself is obsolescent according to POSIX. Programs that set
1751 the system time should use clock_settime and/or the adjtime family of
1752 functions instead. We may cease to make settimeofday available to newly
1753 linked binaries after there is a replacement for Linux's time-zone-like
1756 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1757 the optional CAS instruction is implemented (for instance, LEON processors
1758 are still supported, but SuperSPARC processors are not).
1760 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1763 * If a lazy binding failure happens during dlopen, during the execution of
1764 an ELF constructor, the process is now terminated. Previously, the
1765 dynamic loader would return NULL from dlopen, with the lazy binding error
1766 captured in a dlerror message. In general, this is unsafe because
1767 resetting the stack in an arbitrary function call is not possible.
1769 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1770 executable stack unless explicitly configured at build time to require
1771 minimum kernel version 4.8 or newer. This is because executing
1772 floating-point branches on a non-executable stack on Linux kernels prior to
1773 4.8 can lead to application crashes for some MIPS configurations. While
1774 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1775 expected to enable non-executable stack by default with PT_GNU_STACK by
1776 default and is thus likely to trigger a crash on older kernels.
1778 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1779 non-executable stack while dropping support for older kernels.
1781 * System call wrappers for time system calls now use the new time64 system
1782 calls when available. On 32-bit targets, these wrappers attempt to call
1783 the new system calls first and fall back to the older 32-bit time system
1784 calls if they are not present. This may cause issues in environments
1785 that cannot handle unsupported system calls gracefully by returning
1786 -ENOSYS. Seccomp sandboxes are affected by this issue.
1788 Changes to build and runtime requirements:
1790 * It is no longer necessary to have recent Linux kernel headers to build
1791 working (non-stub) system call wrappers on all architectures except 64-bit
1792 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1794 * The ChangeLog file is no longer present in the toplevel directory of the
1795 source tree. ChangeLog files are located in the ChangeLog.old directory as
1796 ChangeLog.N where the highest N has the latest entries.
1798 Security related changes:
1800 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1801 out-of-bounds write when executed in a signal frame context.
1803 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1804 environment variable during program execution after a security
1805 transition, allowing local attackers to restrict the possible mapping
1806 addresses for loaded libraries and thus bypass ASLR for a setuid
1807 program. Reported by Marcin Kościelnicki.
1809 The following bugs are resolved with this release:
1811 [12031] localedata: iconv -t ascii//translit with Greek characters
1812 [15813] libc: Multiple issues in __gen_tempname
1813 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1814 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1815 [19767] libc: vdso is not used with static linking
1816 [19903] hurd: Shared mappings not being inherited by children processes
1817 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1818 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1820 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1821 Symbols-A/B Unicode blocks
1822 [23518] libc: Eliminate __libc_utmp_jump_table
1823 [24026] malloc: malloc_info() returns wrong numbers
1824 [24054] localedata: Many locales are missing date_fmt
1825 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1826 [24304] dynamic-link: Lazy binding failure during ELF
1827 constructors/destructors is not fatal
1828 [24376] libc: RISC-V symbol size confusion with _start
1829 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1831 [24824] libc: test-in-container does not install charmap files compatible
1833 [24844] regex: regex bad pointer / leakage if malloc fails
1834 [24867] malloc: Unintended malloc_info formatting changes
1835 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1836 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1837 [24882] libc: login: pututline uses potentially outdated cache
1838 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1839 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1841 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1843 [24930] dynamic-link: dlopen of PIE executable can result in
1844 _dl_allocate_tls_init assertion failure
1845 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1846 (stringop-overflow error)
1847 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1848 functions other can lead to crashes
1849 [24967] libc: jemalloc static linking causes runtime failure
1850 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1852 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1853 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1854 [25097] libc: new -Warray-bounds with GCC 10
1855 [25112] dynamic-link: dlopen must not make new objects accessible when it
1856 still can fail with an error
1857 [25139] localedata: Please add the new mnw_MM locale
1858 [25149] regex: Array bounds violation in proceed_next_node
1859 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1860 initialized correctly
1861 [25189] libc: glibc's __glibc_has_include causes issues with clang
1863 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1864 value to an unsigned
1865 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1866 binaries (CVE-2019-19126)
1867 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1869 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1871 [25232] string: <string.h> does not enable const correctness for strchr et
1873 [25233] localedata: Consider "." as the thousands separator for sl_SI
1875 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1876 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1877 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1879 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1880 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1882 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1883 (dl_initfirst) link map pointer
1884 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1885 [25423] libc: Array overflow in backtrace on powerpc
1886 [25425] network: Missing call to __resolv_context_put in
1887 getaddrinfo.c:gethosts
1894 * Unicode 12.1.0 Support: Character encoding, character type info, and
1895 transliteration tables are all updated to Unicode 12.1.0, using
1896 generator scripts contributed by Mike FABIAN (Red Hat).
1898 * The dynamic linker accepts the --preload argument to preload shared
1899 objects, in addition to the LD_PRELOAD environment variable.
1901 * The twalk_r function has been added. It is similar to the existing
1902 twalk function, but it passes an additional caller-supplied argument
1903 to the callback function.
1905 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1907 * Minguo (Republic of China) calendar support has been added as an
1908 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1911 * The entry for the new Japanese era has been added for ja_JP locale.
1913 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1914 pvalloc, memalign, and posix_memalign fail now with total object size
1915 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1916 pointer subtraction within the allocated object, where results might
1917 overflow the ptrdiff_t type.
1919 * The dynamic linker no longer refuses to load objects which reference
1920 versioned symbols whose implementation has moved to a different soname
1921 since the object has been linked. The old error message, symbol
1922 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1923 link time reference, is gone.
1925 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1926 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1927 functions. These behave similarly to their "timed" equivalents, but also
1928 accept a clockid_t parameter to determine which clock their timeout should
1929 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1930 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1931 time of the wait (unlike with pthread_condattr_setclock, which requires
1932 the clock choice at initialization time).
1934 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1935 work, new resolvers can use a second argument which can be extended in
1936 the future, currently it contains the AT_HWCAP2 value.
1938 Deprecated and removed features, and other changes affecting compatibility:
1940 * The copy_file_range function fails with ENOSYS if the kernel does not
1941 support the system call of the same name. Previously, user space
1942 emulation was performed, but its behavior did not match the kernel
1943 behavior, which was deemed too confusing. Applications which use the
1944 copy_file_range function can no longer rely on glibc to provide a fallback
1945 on kernels that do not support the copy_file_range system call, and if
1946 this function returns ENOSYS, they will need to use their own fallback.
1947 Support for copy_file_range for most architectures was added in version
1948 4.5 of the mainline Linux kernel.
1950 * The functions clock_gettime, clock_getres, clock_settime,
1951 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1952 for new applications (on architectures which had them). Instead, the
1953 definitions in libc will be used automatically, which have been available
1956 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1957 and <sys/stropts.h> have been removed.
1959 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1960 resolver flag (deprecated in glibc 2.25) have been removed.
1962 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1963 resolver have been removed from <resolv.h>.
1965 * With --enable-bind-now, installed programs are now linked with the
1968 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1969 configurations) has been removed, following the deprecation of this
1970 subarchitecture in version 8 of GCC, and its removal in version 9.
1972 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1973 header have been removed.
1975 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1976 deprecated and will be removed from a future version of glibc.
1977 Application should directly access /proc instead. For obtaining random
1978 bits, the getentropy function can be used.
1980 Changes to build and runtime requirements:
1982 * GCC 6.2 or later is required to build the GNU C Library.
1984 Older GCC versions and non-GNU compilers are still supported when
1985 compiling programs that use the GNU C Library.
1987 Security related changes:
1989 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1990 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1991 has undefined behavior. On x32, the size_t argument may be passed
1992 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1993 32 bits. When it happened with the sign bit of RDX register set,
1994 memcmp gave the wrong result since it treated the size argument as
1995 zero. Reported by H.J. Lu.
1997 CVE-2019-9169: Attempted case-insensitive regular-expression match
1998 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1999 over-read. Reported by Hongxu Chen.
2001 The following bugs are resolved with this release:
2003 [2872] locale: Transliteration Cyrillic -> ASCII fails
2004 [6399] libc: gettid() should have a wrapper
2005 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2006 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2007 [17396] localedata: globbing for locale by [[.collating-element.]]
2008 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2009 [18465] malloc: memusagestat is built using system C library
2010 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2011 invalid input drops valid char
2012 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2013 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2014 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2015 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2016 [23352] malloc: __malloc_check_init still defined in public header
2018 [23403] nptl: Wrong alignment of TLS variables
2019 [23501] libc: nftw() doesn't return dangling symlink's inode
2020 [23733] malloc: Check the count before calling tcache_get()
2021 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2023 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2024 [23844] nptl: pthread_rwlock_trywrlock results in hang
2025 [23983] argparse: Missing compat versions of argp_failure and argp_error
2026 for long double = double
2027 [23984] libc: Missing compat versions of err.h and error.h functions for
2028 long double = double
2029 [23996] localedata: Dutch salutations
2030 [24040] libc: riscv64: unterminated call chain in __thread_start
2031 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2033 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2034 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2036 [24114] regex: regexec buffer read overrun in "grep -i
2037 '\(\(\)*.\)*\(\)\(\)\1'"
2038 [24122] libc: Segfaults if 0 returned from la_version
2039 [24153] stdio: Some input functions do not react to stdin assignment
2040 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2041 RDX is set) (CVE-2019-7309)
2042 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2043 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2044 not the default "nor"
2045 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2046 false positives, change to modern flexible array
2047 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2048 instructions while maintaining the robust mutex list due to missing
2050 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2051 unnecessary librt dependencies
2052 [24200] localedata: Revert first_weekday removal in en_IE locale
2053 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2054 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2055 [24216] malloc: Check for large bin list corruption when inserting
2057 [24228] stdio: old x86 applications that use legacy libio crash on exit
2058 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2060 [24293] localedata: Missing Minguo calendar support for TW locales
2061 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2062 tt_RU (Tatar) locale
2063 [24307] localedata: Update locale data to Unicode 12.0.0
2064 [24323] dynamic-link: dlopen should not be able open PIE objects
2065 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2066 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2067 tt_RU (Tatar) locale
2068 [24370] localedata: Add lang_name for tt_RU locale
2069 [24372] locale: Binary locale files are not architecture independent
2070 [24394] time: strptime %Ey mis-parses final year of era
2071 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2073 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2075 [24531] malloc: Malloc tunables give tcache assertion failures
2076 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2078 [24535] localedata: Update locale data to Unicode 12.1.0
2079 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2080 kernels and break testing
2081 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2082 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2083 [-Werror=format-overflow=]
2084 [24570] libc: alpha: compat msgctl uses __IPC_64
2085 [24584] locale: Data race in __wcsmbs_clone_conv
2086 [24588] stdio: Remove codecvt vtables from libio
2087 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2089 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2090 [24632] stdio: Old binaries which use freopen with default stdio handles
2092 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2094 [24652] localedata: szl_PL spelling correction
2095 [24695] nss: nss_db: calling getpwent after endpwent crashes
2096 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2097 in /etc/nsswitch.conf
2098 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2099 [24740] libc: getdents64 type confusion
2100 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2101 always implemented in the same library
2102 [24744] libc: Remove copy_file_range emulation
2103 [24757] malloc: memusagestat is linked against system libpthread
2104 [24794] libc: Partial test suite run builds corrupt test-in-container
2112 * The getcpu wrapper function has been added, which returns the currently
2113 used CPU and NUMA node. This function is Linux-specific.
2115 * A new convenience target has been added for distribution maintainers
2116 to build and install all locales as directories with files. The new
2117 target is run by issuing the following command in your build tree:
2118 'make localedata/install-locale-files', with an optional DESTDIR
2119 to set the install root if you wish to install into a non-default
2120 configured location.
2122 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2124 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2125 for _GNU_SOURCE, to match BSD environments.
2127 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2128 indicates that it will abort the transaction prior to entering the kernel
2129 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2130 suspended, and this caused some undefined side-effects issues by aborting
2131 transactions manually. Glibc avoided it by abort transactions manually on
2132 each syscall, but it lead to performance issues on newer kernels where the
2133 HTM state is saved and restore lazily (the state being saved even when the
2134 process actually does not use HTM).
2136 * The functions posix_spawn_file_actions_addchdir_np and
2137 posix_spawn_file_actions_addfchdir_np have been added, enabling
2138 posix_spawn and posix_spawnp to run the new process in a different
2139 directory. These functions are GNU extensions. The function
2140 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2143 * The popen and system do not run atfork handlers anymore (BZ#17490).
2144 Although it is a possible POSIX violation, the POSIX rationale in
2145 pthread_atfork documentation regarding atfork handlers is to handle
2146 inconsistent mutex state after a fork call in a multi-threaded process.
2147 In both popen and system there is no direct access to user-defined mutexes.
2149 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2150 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2152 - C-SKY ABIV2 soft-float little-endian
2153 - C-SKY ABIV2 hard-float little-endian
2155 * strftime's default formatting of a locale's alternative year (%Ey)
2156 has been changed to zero-pad the year to a minimum of two digits,
2157 like "%y". This improves the display of Japanese era years during
2158 the first nine years of a new era, and is expected to be harmless
2159 for all other locales (only Japanese locales regularly have
2160 alternative year numbers less than 10). Zero-padding can be
2161 overridden with the '_' or '-' flags (which are GNU extensions).
2163 * As a GNU extension, the '_' and '-' flags can now be applied to
2164 "%EY" to control how the year number is formatted; they have the
2165 same effect that they would on "%Ey".
2167 Deprecated and removed features, and other changes affecting compatibility:
2169 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2170 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2172 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2173 in <sys/procfs.h>, has been corrected to match the type actually used by
2174 the Linux kernel. This affects the size and layout of that structure on
2175 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2177 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2178 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2179 defined in <sys/procfs.h>, has been corrected to match the type actually
2180 used by the Linux kernel. This affects the size and layout of those
2183 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2184 meant to scan a string and allocate space for it with malloc, is now
2185 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2186 defined. This extension conflicts with C99's use of '%a' to scan a
2187 hexadecimal floating-point number, which is now available to programs
2188 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2190 POSIX.1-2008 includes the feature of allocating a buffer for string input
2191 with malloc, using the modifier letter 'm' instead. Programs using
2192 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2193 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2194 C99 '%a' no longer need to avoid _GNU_SOURCE.
2196 GCC's -Wformat warnings can detect most uses of this extension, as long
2197 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2198 __attribute__ ((format (scanf, ...))).
2200 Changes to build and runtime requirements:
2202 * Python 3.4 or later is required to build the GNU C Library.
2204 * On most architectures, GCC 5 or later is required to build the GNU C
2205 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2207 Older GCC versions and non-GNU compilers are still supported when
2208 compiling programs that use the GNU C Library.
2210 Security related changes:
2212 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2213 denial of service due to resource exhaustion when processing getaddrinfo
2214 calls with crafted host names. Reported by Guido Vranken.
2216 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2217 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2218 happened, accessing the 32-bit size_t value as the full 64-bit register
2219 in the assembly string/memory functions would cause a buffer overflow.
2220 Reported by H.J. Lu.
2222 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2223 addresses with arbitrary trailing characters, potentially leading to data
2224 or command injection issues in applications.
2226 The following bugs are resolved with this release:
2228 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2229 [10496] localedata: 12h time representation in multiple locales faulty
2230 [10797] localedata: it_IT locale numeric does not have a separator for
2232 [11319] libc: dprintf doesn't handle errors properly
2233 [16346] time: mktime: potentially unsafe use of localtime_offset
2234 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2236 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2237 posix_spawn_file_actions_addfchdir_np
2238 [17426] localedata: Indian locales: set the correct date format
2239 [17490] stdio: popen should not invoke atfork handlers
2240 [17783] libc: TIOCSER_TEMT conditions inconsistent
2241 [18040] regex: use-after-free in regexec/get_subexp
2242 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2243 [20018] network: getaddrinfo should reject IP addresses with trailing
2244 characters (CVE-2016-10739)
2245 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2246 [20271] libc: Missing "\n" in __libc_fatal calls
2247 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2248 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2249 pointer argument is non-NULL
2250 [21037] stdio: open_memstream and freopen
2251 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2252 [21716] time: Crash in glibc's mktime in low-memory situations
2253 [22834] stdio: Subprocess forked by popen may crash in Linux when
2254 multithreads call popen
2255 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2256 and pthread_create fails.
2257 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2258 [23125] libc: riscv64: endless loop when throwing an exception from a
2260 [23275] nptl: Race in pthread_mutex_lock while promoting to
2261 PTHREAD_MUTEX_ELISION_NP.
2262 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2264 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2266 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2268 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2269 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2271 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2272 [23521] nss: get_next_alias nss_files file stream leak
2273 [23538] nptl: Hang in pthread_cond_broadcast
2274 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2275 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2276 [23579] libc: Errors misreported in preadv2
2277 [23597] build: support/test-container.c doesn't work with different
2279 [23603] time: mktime signed integer overflow on large timestamps
2280 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2281 [23614] libc: powerpc: missing CFI register information in __mpn_*
2283 [23637] string: Generic strstr/strcasestr fails with huge needles
2284 [23640] libc: no way to easily clear FD_CLOEXEC in
2285 posix_spawn_file_actions_adddup2()
2286 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2288 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2290 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2291 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2292 bits/types/struct_rusage.h
2293 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2295 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2297 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2298 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2299 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2301 [23724] localedata: Albanian date formats are incorrect
2302 [23735] math: libnldbl_nonshared.a references internal libm symbols
2303 [23740] localedata: kl_GL: Month names and date formats need update
2304 [23744] regex: regex refactorings to remove BE, avoid duplication
2305 [23745] time: mktime fix for Gnulib + coreutils
2306 [23758] time: Improve the width of alternate representation for year in
2308 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2309 [23789] time: mktime does not set errno on failure
2310 [23791] localedata: Wrong monetary format for ca_ES locale
2311 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2312 [23794] locale: c16rtomb does not handle surrogate pairs
2313 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2314 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2315 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2316 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2317 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2318 [23862] libc: [sh] missing kernel-features.h undefines
2319 [23864] libc: [riscv] missing kernel-features.h undefines
2320 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2321 [23907] malloc: Incorrect double-free malloc tcache check disregards
2323 [23913] libc: off-by-one in function maybe_script_execute in
2324 sysdeps/posix/spawni.c
2325 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2326 [23923] locale: Add --no-hard-links option to localedef
2327 [23927] network: Linux if_nametoindex() does not close descriptor
2329 [23961] math: powf can overflow to inf without setting errno in non-
2330 nearest rounding mode
2331 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2332 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2333 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2334 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2335 [24011] localedata: Fixed small type in comment for locale bs_BA
2336 [24018] libc: gettext() may return NULL
2337 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2338 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2339 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2341 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2342 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2344 [24046] localedata: en_US locale doesn't define date_fmt
2345 [24063] manual: @var{errno} should be @code{errno}
2346 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2347 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2349 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2351 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2353 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2355 [24112] network: Do not send DNS queries for non-host names (where all
2356 answers will be rejected)
2357 [24130] libc: alpha __remqu corrupts $f3 register
2364 * The localization data for ISO 14651 is updated to match the 2016
2365 Edition 4 release of the standard, this matches data provided by
2366 Unicode 9.0.0. This update introduces significant improvements to the
2367 collation of Unicode characters. This release deviates slightly from
2368 the standard in that the collation element ordering for lowercase and
2369 uppercase LATIN script characters is adjusted to ensure that regular
2370 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2371 is not matched by [a-z]. With the update many locales have been
2372 updated to take advantage of the new collation information. The new
2373 collation information has increased the size of the compiled locale
2374 archive or binary locales.
2376 * The GNU C Library can now be compiled with support for Intel CET, AKA
2377 Intel Control-flow Enforcement Technology. When the library is built
2378 with --enable-cet, the resulting glibc is protected with indirect
2379 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2380 compatible with all existing executables and shared libraries. This
2381 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2382 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2383 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2384 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2385 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2386 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2389 * The GNU C Library now has correct support for ABSOLUTE symbols
2390 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2391 relocated incorrectly or in some cases discarded. The GNU linker can
2392 make use of the newer semantics, but it must communicate it to the
2393 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2394 field) to indicate such support is required.
2396 * Unicode 11.0.0 Support: Character encoding, character type info, and
2397 transliteration tables are all updated to Unicode 11.0.0, using
2398 generator scripts contributed by Mike FABIAN (Red Hat).
2400 * <math.h> functions that round their results to a narrower type are added
2401 from TS 18661-1:2014 and TS 18661-3:2015:
2403 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2404 fMxaddfNx functions.
2406 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2407 fMxsubfNx functions.
2409 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2410 fMxmulfNx functions.
2412 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2413 fMxdivfNx functions.
2415 * Two grammatical forms of month names are now supported for the following
2416 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2417 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2418 support two grammatical forms in abbreviated month names: Catalan, Greek,
2421 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2422 include the support for two grammatical forms of month names.
2424 * Building and running on GNU/Hurd systems now works without out-of-tree
2427 * The renameat2 function has been added, a variant of the renameat function
2428 which has a flags argument. If the flags are zero, the renameat2 function
2429 acts like renameat. If the flag is not zero and there is no kernel
2430 support for renameat2, the function will fail with an errno value of
2431 EINVAL. This is different from the existing gnulib function renameatu,
2432 which performs a plain rename operation in case of a RENAME_NOREPLACE
2433 flags and a non-existing destination (and therefore has a race condition
2434 that can clobber the destination inadvertently).
2436 * The statx function has been added, a variant of the fstatat64
2437 function with an additional flags argument. If there is no direct
2438 kernel support for statx, glibc provides basic stat support based on
2439 the fstatat64 function.
2441 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2442 library if installed. libidn2 version 2.0.5 or later is recommended. If
2443 libidn2 is not available, internationalized domain names are not encoded
2444 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2445 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2446 with an encoding error.) Flags which used to change the IDN encoding and
2447 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2448 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2449 deprecated. They no longer have any effect.
2451 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2452 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2453 range of ELF gABI expressions including such constructs as
2454 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2455 have been further restricted, and where in the past a dynamic string
2456 token sequence may have been interpreted as a literal string it will
2457 now cause a load failure. These load failures were always considered
2458 unspecified behaviour from the perspective of the dynamic loader, and
2459 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2460 results in a load failure now.
2462 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2463 implementation includes all the standard functions provided by
2466 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2467 thrd_detach, thrd_exit, and thrd_join for thread management.
2469 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2470 mtx_destroy for mutual exclusion.
2472 - call_once for function call synchronization.
2474 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2475 cnd_wait for conditional variables.
2477 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2479 Application developers must link against libpthread to use ISO C threads.
2481 Deprecated and removed features, and other changes affecting compatibility:
2483 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2484 installed. Software that was using either header should be updated to
2485 use standard <stdio.h> interfaces instead.
2487 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2488 This was never required by the C standard, and the macros just expanded
2489 to call alternative names for the same functions. If you hoped getc and
2490 putc would provide performance improvements over fgetc and fputc, instead
2491 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2492 necessary, flockfile and funlockfile.
2494 * All stdio functions now treat end-of-file as a sticky condition. If you
2495 read from a file until EOF, and then the file is enlarged by another
2496 process, you must call clearerr or another function with the same effect
2497 (e.g. fseek, rewind) before you can read the additional data. This
2498 corrects a longstanding C99 conformance bug. It is most likely to affect
2499 programs that use stdio to read interactive input from a terminal.
2502 * The macros 'major', 'minor', and 'makedev' are now only available from
2503 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2504 headers that happen to include <sys/types.h>. These macros are rarely
2505 used, not part of POSIX nor XSI, and their names frequently collide with
2506 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2507 further explanation.
2509 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2510 these macros should first include <sys/types.h>, and then include
2511 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2513 * The tilegx*-*-linux-gnu configurations are no longer supported.
2515 * The obsolete function ustat is no longer available to newly linked
2516 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2517 function has been deprecated in favor of fstatfs and statfs.
2519 * The obsolete function nfsservctl is no longer available to newly linked
2520 binaries. This function was specific to systems using the Linux kernel
2521 and could not usefully be used with the GNU C Library on systems with
2522 version 3.1 or later of the Linux kernel.
2524 * The obsolete function name llseek is no longer available to newly linked
2525 binaries. This function was specific to systems using the Linux kernel
2526 and was not declared in a header. Programs should use the lseek64 name
2527 for this function instead.
2529 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2530 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2531 previously selected by them is now always enabled.
2533 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2534 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2535 restriction (rejecting '_' in host names, among other things) has been
2536 removed, for increased compatibility with non-IDN name resolution.
2538 * The fcntl function now have a Long File Support variant named fcntl64. It
2539 is added to fix some Linux Open File Description (OFD) locks usage on non
2540 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2541 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2542 locks act as a cancellation entrypoint.
2544 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2545 ecb_crypt, and des_setparity are no longer available to newly linked
2546 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2547 longer installed. These functions encrypted and decrypted data with the
2548 DES block cipher, which is no longer considered secure. Software that
2549 still uses these functions should switch to a modern cryptography library,
2552 * Reflecting the removal of the encrypt and setkey functions above, the
2553 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2554 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2557 * The obsolete function fcrypt is no longer available to newly linked
2558 binaries. It was just another name for the standard function crypt,
2559 and it has not appeared in any header file in many years.
2561 * We have tentative plans to hand off maintenance of the passphrase-hashing
2562 library, libcrypt, to a separate development project that will, we hope,
2563 keep up better with new passphrase-hashing algorithms. We will continue
2564 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2565 'crypt_r' should not need to change at all; however, distributions will
2566 need to install <crypt.h> and libcrypt from a separate project.
2568 In this release, if the configure option --disable-crypt is used, glibc
2569 will not install <crypt.h> or libcrypt, making room for the separate
2570 project's versions of these files. The plan is to make this the default
2571 behavior in a future release.
2573 Changes to build and runtime requirements:
2575 GNU make 4.0 or later is now required to build glibc.
2577 Security related changes:
2579 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2580 been fixed by removing the glibc-internal IDNA implementation and using
2581 the system-provided libidn2 library instead. Originally reported by Hanno
2582 Böck and Christian Weisgerber.
2584 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2585 architecture could corrupt memory. Reported by Max Horn.
2587 CVE-2018-11236: Very long pathname arguments to realpath function could
2588 result in an integer overflow and buffer overflow. Reported by Alexey
2591 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2592 architecture could write beyond the target buffer, resulting in a buffer
2593 overflow. Reported by Andreas Schwab.
2595 The following bugs are resolved with this release:
2597 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2598 [6889] manual: 'PWD' mentioned but not specified
2599 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2600 when __WORDSIZE != 64
2601 [13762] regex: re_search etc. should return -2 on memory exhaustion
2602 [13888] build: /tmp usage during testing
2603 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2604 [14092] nptl: Support C11 threads
2605 [14095] localedata: Review / update collation data from Unicode / ISO
2607 [14508] libc: -Wformat warnings
2608 [14553] libc: Namespace pollution loff_t in sys/types.h
2609 [14890] libc: Make NT_PRFPREG canonical.
2610 [15105] libc: Extra PLT references with -Os
2611 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2613 [16335] manual: Feature test macro documentation incomplete and out of
2615 [16552] libc: Unify umount implementations in terms of umount2
2616 [17082] libc: htons et al.: statement-expressions prevent use on global
2617 scope with -O1 and higher
2618 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2619 [17438] localedata: pt_BR: wrong d_fmt delimiter
2620 [17662] libc: please implement binding for the new renameat2 syscall
2621 [17721] libc: __restrict defined as /* Ignore */ even in c11
2622 [17979] libc: inconsistency between uchar.h and stdint.h
2623 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2624 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2625 horrible machine code)
2626 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2628 [18471] libc: llseek should be a compat symbol
2629 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2631 [18991] nss: nss_files skips large entry in database
2632 [19239] libc: Including stdlib.h ends up with macros major and minor being
2634 [19463] libc: linknamespace failures when compiled with -Os
2635 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2636 [19527] locale: Normalized charset name not recognized by setlocale
2637 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2638 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2640 [19728] network: out of bounds stack read in libidn function
2641 idna_to_ascii_4i (CVE-2016-6261)
2642 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2643 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2644 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2646 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2647 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2648 [20419] dynamic-link: files with large allocated notes crash in
2650 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2651 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2652 [20980] manual: CFLAGS environment variable replaces vital options
2653 [21163] regex: Assertion failure in pop_fail_stack when executing a
2654 malformed regexp (CVE-2015-8985)
2655 [21234] manual: use of CFLAGS makes glibc detect no optimization
2656 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2657 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2658 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2659 [21508] locale: intl/tst-gettext failure with latest msgfmt
2660 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2661 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2662 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2664 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2666 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2667 [22247] network: Integer overflow in the decode_digit function in
2668 puny_decode.c in libidn (CVE-2017-14062)
2669 [22342] nscd: NSCD not properly caching netgroup
2670 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2671 [22550] localedata: es_ES locale (and other es_* locales): collation
2672 should treat ñ as a primary different character, sync the collation
2673 for Spanish with CLDR
2674 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2675 by gcc configured with --enable-default-pie
2676 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2677 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2678 crossing 2GB threshold (CVE-2017-18269)
2679 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2681 [22735] time: Misleading typo in time.h source comment regarding
2683 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2684 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2685 `__assert_perror_fail ()' to `__assert_fail_base ()'
2686 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2688 [22786] libc: Stack buffer overflow in realpath() if input size is close
2689 to SSIZE_MAX (CVE-2018-11236)
2690 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2691 through an absolute DT_NEEDED path
2692 [22792] build: tcb-offsets.h dependency dropped
2693 [22797] libc: pkey_get() uses non-reserved name of argument
2694 [22807] libc: PTRACE_* constants missing for powerpc
2695 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2696 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2697 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2698 [22848] localedata: ca_ES: update date definitions from CLDR
2699 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2700 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2701 [22896] localedata: Update locale data for an_ES
2702 [22902] math: float128 test failures with GCC 8
2703 [22918] libc: multiple common of `__nss_shadow_database'
2704 [22919] libc: sparc32: backtrace yields infinite backtrace with
2706 [22926] libc: FTBFS on powerpcspe
2707 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2709 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2710 [22947] libc: FAIL: misc/tst-preadvwritev2
2711 [22963] localedata: cs_CZ: Add alternative month names
2712 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2713 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2714 [22998] dynamic-link: execstack tests are disabled when SELinux is
2716 [23005] network: Crash in __res_context_send after memory allocation
2718 [23007] math: strtod cannot handle -nan
2719 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2720 [23036] regex: regex equivalence class regression
2721 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2722 [23069] libc: sigaction broken on riscv64-linux-gnu
2723 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2724 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2725 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2726 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2727 and libc build with -Os)
2728 [23140] localedata: More languages need two forms of month names
2729 [23145] libc: _init/_fini aren't marked as hidden
2730 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2731 [23171] math: C++ iseqsig for long double converts arguments to double
2732 [23178] nscd: sudo will fail when it is run in concurrent with commands
2733 that changes /etc/passwd
2734 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2736 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2737 [23208] localedata: New locale - Lower Sorbian (dsb)
2738 [23233] regex: Memory leak in build_charclass_op function in file
2740 [23236] stdio: Harden function pointers in _IO_str_fields
2741 [23250] nptl: Offset of __private_ss differs from GCC
2742 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2743 -mtune=generic -mfpmath=sse
2744 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2746 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2747 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2749 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2750 [23277] math: nan function should not have const attribute
2751 [23279] math: scanf and strtod wrong for some hex floating-point
2752 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2754 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2755 [23303] build: undefined reference to symbol
2756 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2757 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2759 [23313] stdio: libio vtables validation and standard file object
2761 [23329] libc: The __libc_freeres infrastructure is not properly run across
2763 [23349] libc: Various glibc headers no longer compatible with
2765 [23351] malloc: Remove unused code related to heap dumps and malloc
2767 [23363] stdio: stdio-common/tst-printf.c has non-free license
2768 [23396] regex: Regex equivalence regression in single-byte locales
2769 [23422] localedata: oc_FR: More updates of locale data
2770 [23442] build: New warning with GCC 8
2771 [23448] libc: Out of bounds access in IBM-1390 converter
2772 [23456] libc: Wrong index_cpu_LZCNT
2773 [23458] build: tst-get-cpu-features-static isn't added to tests
2774 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2776 [23467] dynamic-link: x86/CET: A property note parser bug
2783 * The GNU C Library can now be compiled with support for building static
2784 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2785 executables are like static executables but can be loaded at any address
2786 and provide additional security hardening benefits at the cost of some
2787 memory and performance. When the library is built with --enable-static-pie
2788 the resulting libc.a is usable with GCC 8 and above to create static PIE
2789 executables using the GCC option '-static-pie'. This feature is currently
2790 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2791 aarch64 with binutils 2.30 or later.
2793 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2794 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2797 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2799 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2801 * In order to support faster and safer process termination the malloc API
2802 family of functions will no longer print a failure address and stack
2803 backtrace after detecting heap corruption. The goal is to minimize the
2804 amount of work done after corruption is detected and to avoid potential
2805 security issues in continued process execution. Reducing shutdown time
2806 leads to lower overall process restart latency, so there is benefit both
2807 from a security and performance perspective.
2809 * The abort function terminates the process immediately, without flushing
2810 stdio streams. Previous glibc versions used to flush streams, resulting
2811 in deadlocks and further data corruption. This change also affects
2812 process aborts as the result of assertion failures.
2814 * On platforms where long double has the IEEE binary128 format (aarch64,
2815 alpha, mips64, riscv, s390 and sparc), the math library now implements
2816 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2817 These are the same interfaces added in version 2.26 for some platforms where
2818 this format is supported but is not the format of long double.
2820 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2821 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2822 implements interfaces for that type, as defined by ISO/IEC TS
2823 18661-3:2015. These are corresponding interfaces to those supported for
2826 * The math library now implements interfaces for the _Float32, _Float64 and
2827 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2828 corresponding interfaces to those supported for _Float128.
2830 * glibc now implements the memfd_create and mlock2 functions on Linux.
2832 * Support for memory protection keys was added. The <sys/mman.h> header now
2833 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2836 * The copy_file_range function was added.
2838 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2840 * The ldconfig utility now processes `include' directives using the C/POSIX
2841 collation ordering. Previous glibc versions used locale-specific
2842 ordering, the change might break systems that relied on that.
2844 * Support for two grammatical forms of month names has been added.
2845 In a call to strftime, the "%B" and "%b" format specifiers will now
2846 produce the grammatical form required when the month is used as part
2847 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2848 required when the month is named by itself. For instance, in Greek
2849 and in many Slavic and Baltic languages, "%B" will produce the month
2850 in genitive case, and "%OB" will produce the month in nominative case.
2852 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2853 are all valid and will all accept any known form of month
2854 name---standalone or complete, abbreviated or full. In a call to
2855 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2856 the strings used by "%B" and "%b", respectively. New query
2857 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2858 used by "%OB" and "%Ob", respectively.
2860 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2861 define the strings for %OB and %Ob, respectively; these have the
2862 same syntax as "mon" and "abmon". These arrays are optional; if they
2863 are not provided then they have the same content as "mon" and "abmon",
2866 These features are provided for locales which define "alt_mon" and/or
2867 "ab_alt_mon" in their locale source data. This release includes such
2868 alternative month name data for the following languages: Belarusian,
2869 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2871 This feature is currently a GNU extension, but it is expected to
2872 be added to the next revision of POSIX, and it is also already
2873 available on some BSD-derived operating systems.
2875 This feature will cause existing statically compiled applications
2876 to fail to load locales and fall back to the builtin C/POSIX locales.
2877 See notes below for other changes affecting compatibility.
2879 * Support for the RISC-V ISA running on Linux has been added. This port
2880 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2881 for the following ISA and ABI pairs:
2887 Deprecated and removed features, and other changes affecting compatibility:
2889 * Statically compiled applications attempting to load locales compiled for the
2890 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2891 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2892 support for two grammatical forms of the month names, also extends the locale
2893 data binary format. Static applications needing locale support must be
2894 recompiled to match the runtime and data they are deployed with. In some
2895 distributions there is an upgrade window where dynamically linked applications
2896 may use a new library but the old locale data and also fall back to the
2897 builtin C/POSIX locales; restarting the application process is sufficient to
2900 * Support for statically linked applications which call dlopen is deprecated
2901 and will be removed in a future version of glibc. Applications which call
2902 dlopen need to be linked dynamically instead.
2904 * Support for old programs which use internal stdio data structures and
2905 functions is deprecated. This includes programs which use the C++ streams
2906 provided by libstdc++ in GCC 2.95. Programs which use the internal
2907 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2908 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2909 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2910 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2911 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2912 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2913 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2914 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2915 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2916 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2917 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2918 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2919 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2920 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2921 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2922 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2923 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2924 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2925 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2926 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2927 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2928 future version of glibc. Unlike other symbol removals, these old
2929 applications will not be supported using compatibility symbols.
2931 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2932 defined by <sys/ptrace.h>.
2934 * libm no longer supports SVID error handling (calling a user-provided
2935 matherr function on error) or the _LIB_VERSION variable to control error
2936 handling. (SVID error handling and the _LIB_VERSION variable still work
2937 for binaries linked against older versions of the GNU C Library.) The
2938 libieee.a library is no longer provided. math.h no longer defines struct
2939 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2940 TLOSS, PLOSS and HUGE.
2942 * The libm functions pow10, pow10f and pow10l are no longer supported for
2943 new programs. Programs should use the standard names exp10, exp10f and
2944 exp10l for these functions instead.
2946 * The mcontext_t type is no longer the same as struct sigcontext. On
2947 platforms where it was previously the same, this changes the C++ name
2948 mangling for interfaces involving this type.
2950 * The add-ons mechanism for building additional packages at the same time as
2951 glibc has been removed. The --enable-add-ons configure option is now
2954 * The --without-fp configure option is now ignored. Whether hardware
2955 floating-point instructions are used is now configured based on whether
2956 the compiler used at configure time (without any options implied by a
2957 --with-cpu= configure option) uses such instructions.
2959 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2960 the specified string can be parsed as a domain name.
2962 * In the malloc_info output, the <heap> element may contain another <aspace>
2963 element, "subheaps", which contains the number of sub-heaps.
2965 * The libresolv function p_secstodate is no longer supported for new
2968 * The tilepro-*-linux-gnu configuration is no longer supported.
2970 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2971 and will be removed in a future release. Software that is still using
2972 either header should be updated to use standard <stdio.h> interfaces
2975 libio.h was originally the header for a set of supported GNU extensions,
2976 but they have not been maintained as such in many years, they are now
2977 standing in the way of improvements to stdio, and we don't think there are
2978 any remaining external users. _G_config.h was never intended for public
2979 use, but predates the bits convention.
2981 Changes to build and runtime requirements:
2983 * bison version 2.7 or later is required to generate code in the 'intl'
2986 Security related changes:
2988 CVE-2009-5064: The ldd script would sometimes run the program under
2989 examination directly, without preventing code execution through the
2990 dynamic linker. (The glibc project disputes that this is a security
2991 vulnerability; only trusted binaries must be examined using the ldd
2994 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2995 suffered from a one-byte overflow during ~ operator processing (either
2996 on the stack or the heap, depending on the length of the user name).
2997 Reported by Tim Rühsen.
2999 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3000 would sometimes fail to free memory allocated during ~ operator
3001 processing, leading to a memory leak and, potentially, to a denial
3004 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3005 without GLOB_NOESCAPE, could write past the end of a buffer while
3006 unescaping user names. Reported by Tim Rühsen.
3008 CVE-2017-17426: The malloc function, when called with an object size near
3009 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3010 instead of NULL. This was a regression introduced with the new malloc
3011 thread cache in glibc 2.26. Reported by Iain Buclaw.
3013 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3014 to the allocation of too much memory. (This is not a security bug per se,
3015 it is mentioned here only because of the CVE assignment.) Reported by
3018 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3019 of the number of search path components. (This is not a security
3020 vulnerability per se because no trust boundary is crossed if the fix for
3021 CVE-2017-1000366 has been applied, but it is mentioned here only because
3022 of the CVE assignment.) Reported by Qualys.
3024 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3025 for AT_SECURE or SUID binaries could be used to load libraries from the
3028 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3029 succeeds without returning an absolute path due to unexpected behaviour
3030 of the Linux kernel getcwd syscall. Reported by halfdog.
3032 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3033 an object size near the value of SIZE_MAX, would return a pointer to a
3034 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3036 CVE-2018-6551: The malloc function, when called with an object size near
3037 the value of SIZE_MAX, would return a pointer to a buffer which is too
3038 small, instead of NULL.
3040 The following bugs are resolved with this release:
3042 [866] glob: glob should match dangling symlinks
3043 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3044 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3046 [5997] math: Very slow execution of sinf function
3047 [10580] localedata: hr_HR: updated locale
3048 [10871] locale: 'mon' array should contain both nominative and genitive
3050 [12349] localedata: eu_ES: incorrect thousands separator
3051 [13605] localedata: shn_MM: new Shan locale
3052 [13805] localedata: ru_RU: currency should use ',' as radix point
3053 [13953] localedata: km_KH: locale update
3054 [13994] localedata: mjw_IN: new locale
3055 [14121] build: make writes .mo files in po directory
3056 [14333] libc: Fix the race between atexit() and exit()
3057 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3058 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3060 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3061 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3062 width Latin characters
3063 [15332] localedata: es_CU: locale update
3064 [15436] stdio: Don't close or flush stdio streams on abort
3065 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3067 [16148] localedata: ca_ES: incorrect thousands separator
3068 [16750] dynamic-link: ldd should not try to execute the binaries
3070 [16777] localedata: pl_PL: incorrect thousands separator in locale
3071 [16905] localedata: hanzi: new collation
3072 [17563] localedata: cmn_TW: add hanzi collation
3073 [17750] localedata: wrong collation order of diacritics in most locales
3074 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3076 [17956] build: Build fails on missing definitions from header file
3077 nss/nss.h when Mozilla NSS is used for cryptography
3078 [18203] libc: realpath() does not handle unreachable paths correctly
3079 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3080 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3081 [18822] libc: Internal functions are called via PLT
3082 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3083 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3084 [19574] libc: glibc should support building static PIE binaries
3085 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3087 [19971] glob: glob: Do not skip entries with zero d_ino values
3088 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3089 [20008] localedata: km_KH: convert to translit_neutral
3090 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3091 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3092 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3093 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3094 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3096 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3097 they're set, wrong errors returned by gaih_inet when lookup functions
3099 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3100 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3102 [20952] localedata: yuw_PG: new locale
3103 [21084] localedata: charmaps/IBM858: new codepage
3104 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3105 [21242] libc: assert gives pedantic warning in old gcc versions
3106 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3107 __regcall calling convention
3108 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3109 [21326] libc: C99 functions are not declared for C++11 and later if
3110 _GNU_SOURCE is not predefined by g++
3111 [21457] libc: sys/ucontext.h namespace
3112 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3113 [21660] math: GCC fails to compile a formula with tgmath.h
3114 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3115 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3116 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3117 [21684] math: tgmath.h handling of complex integers
3118 [21685] math: tgmath.h handling of bit-fields
3119 [21686] math: tgmath.h handling of __int128
3120 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3122 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3124 [21750] localedata: column width of characters incompatible with classical
3126 [21754] malloc: malloc: Perform as little work as possible after heap
3127 consistency check failures
3128 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3129 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3130 [21791] string: Unused XXX_chk_XXX functions in libc.a
3131 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3133 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3135 [21845] localedata: Added new Locale bho_NP
3136 [21853] localedata: Fix abday Which looks same as day in zh_SG
3137 [21854] localedata: Added New Locale en_SC
3138 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3139 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3140 _dl_runtime_resolve_avx_slow
3141 [21885] network: getaddrinfo: gethosts does not release resolver context
3142 on memory allocation failure
3143 [21899] libc: XPG4.2 sigaction namespace
3144 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3146 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3148 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3149 errno value, causing getaddrinfo to fail
3150 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3151 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3152 instead of EAI_NODATA
3153 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3154 constant PTRACE_SEIZE_DEVEL
3155 [21930] math: C-only gcc builtins used in <math.h> isinf
3156 [21932] network: Unpaired __resolv_context_get in generic get*_r
3158 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3159 [21944] libc: sigval namespace
3160 [21951] localedata: Update hanzi collation by stroke
3161 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3162 sysdeps/x86_64/fpu/e_expf.S
3163 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3164 allocation in syscall loops)
3165 [21959] localedata: Fix Country name for xh_ZA
3166 [21960] localedata: Fix abmon for bem_ZM
3167 [21966] math: AVX2 mathvec functions use FMA without checking
3168 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3169 [21971] localedata: Added New Locale for mfe_MU
3170 [21972] libc: assert macro requires operator== (int) for its argument type
3171 [21973] math: [sparc] libm missing sqrtl compat symbol
3172 [21974] libc: Remove __bb_init_func and __bb_exit_func
3173 [21982] string: stratcliff.c: error: assuming signed overflow does not
3175 [21986] stdio: __guess_grouping is called incorrectly
3176 [21987] math: [sparc32] wrong bits/long-double.h installed
3177 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3179 [22022] localedata: Missing country_name for mni_IN
3180 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3182 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3184 [22026] locale: iconv_open: heap overflow on gconv_init failure
3185 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3186 [22035] math: [m68k] bits/math-inline.h macro namespace
3187 [22038] localedata: Fix abbreviated weeks and months for Somali
3188 [22044] localedata: Remove redundant data for Limburgish Language
3189 [22050] malloc: Linking with -lmcheck does not hook
3190 __malloc_initialize_hook correctly
3191 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3192 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3193 [22070] localedata: charmaps/UTF-8: wcwidth for
3194 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3195 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3196 Jungseong and Jongseong) should be 0
3197 [22078] nss: nss_files performance issue in multi mode
3198 [22082] math: bits/math-finite.h exp10 condition
3199 [22086] libc: pcprofiledump incorrect cross-endian condition
3200 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3201 [22095] network: Name server address allocation memory leak in resolv.conf
3203 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3205 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3206 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3208 [22111] malloc: malloc: per thread cache is not returned when thread exits
3209 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3210 [22134] libc: [linux] implement fexecve with execveat
3211 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3213 [22145] libc: ttyname() gives up too early in the face of namespaces
3214 [22146] math: C++ build issue with float128 on x86_64
3215 [22153] nptl: nptl: save error code before process termination
3216 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3217 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3218 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3219 [22165] libc: [hppa] Text relocations in libc.so
3220 [22180] libc: destructor registered via __cxa_atexit is called twice
3221 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3222 symlinks") cause "make" segfaults
3223 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3225 [22207] libc: FAIL: stdlib/test-atexit-race
3226 [22225] math: nearbyint arithmetic moved before feholdexcept
3227 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3228 [22235] math: iscanonical in C++ and float128
3229 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3230 the svid compat wrapper
3231 [22244] math: ynf and yn are wrong without the svid compat wrapper
3232 [22273] libc: Improper assert in Linux posix_spawn implementation
3233 [22284] libc: -pg -pie doesn't work
3234 [22292] locale: localedef exits with error 4 when it should be error 1
3235 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3236 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3238 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3239 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3241 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3242 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3243 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3244 [22322] libc: [mips64] wrong bits/long-double.h installed
3245 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3246 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3248 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3249 [22343] malloc: Integer overflow in posix_memalign
3250 [22347] libc: getrandom() returns the number of bytes that were copied to
3251 the buffer even though the comments say "Return 0 on success and -1 on
3253 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3254 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3256 [22370] dynamic-link: Incorrect note padding check
3257 [22375] libc: malloc returns pointer from tcache_get when should return
3258 NULL (CVE-2017-17426)
3259 [22377] math: iseqsig, float128 and C++
3260 [22382] localedata: Error in tpi_PG locale
3261 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3262 inside the ASCII printable range
3263 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3265 [22403] localedata: Slash needs escaping in some locales
3266 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3267 [22409] network: res_hnok does not accept some host names used on the
3269 [22412] network: res_dnok, res_hnok should perform syntax checks
3270 [22413] network: ns_name_pton ignores syntactically invalid trailing
3272 [22415] stdio: setvbuf can lead to invalid free/segfault
3273 [22432] build: Non-deterministic build
3274 [22439] malloc: malloc_info should compute summary statistics for all sub-
3276 [22442] network: if_nametoindex could report index for the wrong
3277 networking interface
3278 [22446] build: aliasing violation calling readlink in handle_request
3279 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3280 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3281 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3282 __nscd_hash/__nss_hash
3283 [22463] network: p_secstodate overflow handling
3284 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3285 [22478] libc: sigwait can fail with EINTR
3286 [22505] libc: ldconfig processes include directive in locale-specific
3288 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3289 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3290 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3291 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3292 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3293 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3294 same as for Croatian
3295 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3296 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3297 [22577] libc: missing newline after "cannot allocate TLS data structures
3299 [22588] manual: manual/conf.texi: missing underscore in front of
3301 [22593] math: nextafter and nexttoward are declared with const attribute
3302 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3303 [22603] string: ia64 memchr overflows internal pointer check
3304 [22605] libc: SH clone does not set the exit code correctly
3305 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3307 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3308 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3309 modified in case of success
3310 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3311 [22615] manual: manual: ambiguous wording about errno value in case of
3313 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3315 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3316 binaries or if /proc is not mounted (CVE-2017-16997)
3317 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3318 [22630] build: $(no-pie-ldflag) is no longer effective
3319 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3320 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3321 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3322 [22637] nptl: guard size is subtracted from thread stack size instead of
3324 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3325 [22657] localedata: hu_HU: Avoid double space in date
3326 [22660] math: fmax, fmin sNaN handling on alpha
3327 [22664] libc: New warning of GCC8
3328 [22665] math: alpha: ceil and floor raise inexact exceptions
3329 [22666] math: alpha: trunc raise inexact exceptions
3330 [22667] libc: makecontext lacks stack alignment on i386
3331 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3332 [22679] libc: getcwd(3) can succeed without returning an absolute path
3334 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3335 elision and tunables
3336 [22687] math: [powerpc-nofpu] complex long double functions spurious
3338 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3339 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3340 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3342 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3343 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3345 [22701] nis: Incomplete removal of libnsl
3346 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3347 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3348 [22715] dynamic-link: FAIL: elf/tst-audit10
3349 [22719] libc: Backtrace tests fail on hppa
3350 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3351 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3352 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3353 before the first call to crypt_r () in crypt/badsalttest.c
3360 * A per-thread cache has been added to malloc. Access to the cache requires
3361 no locks and therefore significantly accelerates the fast path to allocate
3362 and free small amounts of memory. Refilling an empty cache requires locking
3363 the underlying arena. Performance measurements show significant gains in a
3364 wide variety of user workloads. Workloads were captured using a special
3365 instrumented malloc and analyzed with a malloc simulator. Contributed by
3366 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3368 * Unicode 10.0.0 Support: Character encoding, character type info, and
3369 transliteration tables are all updated to Unicode 10.0.0, using
3370 generator scripts contributed by Mike FABIAN (Red Hat).
3371 These updates cause user visible changes, especially the changes in
3372 wcwidth for many emoji characters cause problems when emoji sequences
3373 are rendered with pango, see for example:
3374 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3376 * Collation of Hungarian has been overhauled and is now consistent with "The
3377 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3380 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3382 - The GNU C Library will now detect when /etc/resolv.conf has been
3383 modified and reload the changed configuration. The new resolver option
3384 “no-reload” (RES_NORELOAD) disables this behavior.
3386 - The GNU C Library now supports an arbitrary number of search domains
3387 (configured using the “search” directive in /etc/resolv.conf);
3388 previously, there was a hard limit of six domains. For backward
3389 compatibility, applications that directly modify the ‘_res’ global
3390 object are still limited to six search domains.
3392 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3393 Library will now randomly pick a name server from the configuration as a
3394 starting point. (Previously, the second name server was always used.)
3396 * The tunables feature is now enabled by default. This allows users to tweak
3397 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3399 * New function reallocarray, which resizes an allocated block (like realloc)
3400 to the product of two sizes, with a guaranteed clean failure upon integer
3401 overflow in the multiplication. Originally from OpenBSD, contributed by
3402 Dennis Wölfing and Rüdiger Sonderfeld.
3404 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3405 These are extended versions of preadv and pwritev, respectively, taking an
3406 additional flags argument. The set of supported flags depends on the
3407 running kernel; full support currently requires kernel 4.7 or later.
3409 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3410 create a new session ID for the spawned process. This feature is
3411 scheduled to be added to the next major revision of POSIX; for the time
3412 being, it is available under _GNU_SOURCE.
3414 * errno.h is now safe to use from C-preprocessed assembly language on all
3415 supported operating systems. In this context, it will only define the
3416 Exxxx constants, as preprocessor macros expanding to integer literals.
3418 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3419 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3420 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3421 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3423 To compile programs that use this feature, the compiler must support
3424 128-bit floating point with the type name _Float128 (as defined by TS
3425 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3426 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3427 must be defined to make the new interfaces visible.
3429 The new functions and macros correspond to those present for other
3430 floating-point types (except for a few obsolescent interfaces not
3431 supported for the new type), with F128 or f128 suffixes; for example,
3432 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3433 printf or scanf formats for the new type; the strfromf128 and strtof128
3434 interfaces should be used instead.
3436 Deprecated and removed features, and other changes affecting compatibility:
3438 * The synchronization that pthread_spin_unlock performs has been changed to
3439 now be equivalent to a C11 atomic store with release memory order to the
3440 spin lock's memory location. Previously, several (but not all)
3441 architectures used stronger synchronization (e.g., containing what is
3442 often called a full barrier). This change can improve performance, but
3443 may affect odd fringe uses of spin locks that depend on the previous
3444 behavior (e.g., using spin locks as atomic variables to try to implement
3445 Dekker's mutual exclusion algorithm).
3447 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3450 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3451 will only be built and installed when the GNU C Library is configured with
3452 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3453 as TIRPC or rpcsvc-proto, to be used.
3455 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3456 libnss_compat, are deprecated, and will not be built or installed by
3459 The NIS(+) support library, libnsl, is also deprecated. By default, a
3460 compatibility shared library will be built and installed, but not headers
3461 or development libraries. Only a few NIS-related programs require this
3462 library. (In particular, the GNU C Library has never required programs
3463 that use 'gethostbyname' to be linked with libnsl.)
3465 Replacement implementations based on TIRPC, which additionally support
3466 IPv6, are available from <https://github.com/thkukuk/>. The configure
3467 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3468 name service modules, to be built and installed.
3470 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3471 support is enabled, the configured recursive resolver must support EDNS.
3472 (Responding to EDNS-enabled queries with responses which are not
3473 EDNS-enabled is fine, but FORMERR responses are not.)
3475 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3476 servers have not supported this opcode for a long time.
3478 * The _res_opcodes variable has been removed from libresolv. It had been
3479 exported by accident.
3481 * <string.h> no longer includes inline versions of any string functions,
3482 as this kind of optimization is better done by the compiler. The macros
3483 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3485 * The nonstandard header <xlocale.h> has been removed. Most programs should
3486 use <locale.h> instead. If you have a specific need for the definition of
3487 locale_t with no other declarations, please contact
3488 libc-alpha@sourceware.org and explain.
3490 * The obsolete header <sys/ultrasound.h> has been removed.
3492 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3494 * The obsolete function cfree has been removed. Applications should use
3497 * The stack_t type no longer has the name struct sigaltstack. This changes
3498 the C++ name mangling for interfaces involving this type.
3500 * The ucontext_t type no longer has the name struct ucontext. This changes
3501 the C++ name mangling for interfaces involving this type.
3503 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3504 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3505 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3506 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3507 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3508 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3509 fpregset_t type no longer has the name struct fpu. This changes the C++
3510 name mangling for interfaces involving those types.
3512 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3513 synced with the kernel:
3515 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3516 are not supported on this architecture and have been removed.
3518 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3519 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3520 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3522 Programs that assume the GET/SETREGS ptrace requests are universally
3523 available will now fail to build, instead of malfunctioning at runtime.
3525 Changes to build and runtime requirements:
3527 * Linux kernel 3.2 or later is required at runtime, on all architectures
3528 supported by that kernel. (This is a change from version 2.25 only for
3531 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3533 * On most architectures, GCC 4.9 or later is required to build the GNU C
3534 Library. On powerpc64le, GCC 6.2 or later is required.
3536 Older GCC versions and non-GNU compilers are still supported when
3537 compiling programs that use the GNU C Library. (We do not know exactly
3538 how old, and some GNU extensions to C may be _de facto_ required. If you
3539 are interested in helping us make this statement less vague, please
3540 contact libc-alpha@sourceware.org.)
3542 Security related changes:
3544 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3545 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3547 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3548 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3550 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3551 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3554 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3555 fixed (CVE-2017-12133).
3557 The following bugs are resolved with this release:
3559 [984] network: Respond to changed resolv.conf in gethostbyname
3560 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3561 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3563 [12189] libc: __stack_chk_fail should not attempt a backtrace
3565 [14096] time: Race condition on timezone/tst-timezone.out
3566 [14172] localedata: az_IR: new locale
3567 [14995] build: glibc fails to build if gold is the default linker, even if
3569 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3570 [16637] network: inet_pton function is accepting IPv6 with bad format
3571 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3572 x86 and other generic code
3573 [16875] localedata: ko_KR: fix lang_name
3574 [17225] localedata: ar_SY: localized month names for May and June are
3576 [17297] localedata: da_DK: wrong date_fmt string
3577 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3578 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3579 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3580 [19066] localedata: ar_SA abbreviated day and month names are in English
3581 [19569] network: resolv: Support an arbitrary number of search domains
3582 [19570] network: Implement random DNS server selection in the stub
3584 [19838] locale: localedef fails on PA-RISC
3585 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3586 order of 0D36 and 0D37
3587 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3589 [20098] libc: FAIL: debug/backtrace-tst on hppa
3590 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3592 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3594 [20313] localedata: Update locale data to Unicode 9.0
3595 [20424] manual: Document how to provide a malloc replacement
3596 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3598 [20686] locale: Add el_GR@euro to SUPPORTED.
3599 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3600 failures consistently
3601 [21015] dynamic-link: Document and fix --enable-bind-now
3602 [21016] nptl: pthread_cond support is broken on hppa
3603 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3604 frame-pointer on i386
3605 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3607 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3608 [21088] libc: Build fails with --enable-static-nss
3609 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3610 generic c code is used
3611 [21109] libc: Tunables broken on big-endian
3612 [21112] math: powf has large ulp errors with base close to 1 and exponent
3614 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3616 [21120] malloc: glibc malloc is incompatible with GCC 7
3617 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3619 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3620 (-0.0) when linking with -lieee
3621 [21171] math: log10, log2 and lgamma return incorrect results
3622 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3623 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3624 [21207] localedata: ce_RU: update weekdays from CLDR
3625 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3626 [21217] localedata: Update months from CLDR-31
3627 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3628 [21243] libc: support_delete_temp_file should issue warning for failed
3630 [21244] libc: support resolv_test_start() socket fd close should be
3632 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3633 new posix_spawn implementation
3634 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3635 leads to lower CPU frequency
3636 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3637 [21261] libc: [sparc64] bits/setjmp.h namespace
3638 [21267] network: [mips] bits/socket.h IOC* namespace
3639 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3640 [21270] libc: mmap64 silently truncates large offset values
3641 [21275] libc: posix_spawn always crashes on ia64 now
3642 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3643 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3644 [21289] libc: Incorrect declaration for 32-bit platforms with
3645 _FILE_OFFSET_BITS=64 causes build error
3646 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3647 not support gethostbyname4_r
3648 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3650 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3652 [21340] libc: Support POSIX_SPAWN_SETSID
3653 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3654 [21359] network: ns_name_pack needs additional byte in destination buffer
3655 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3656 against fragmentation attacks (CVE-2017-12132)
3657 [21369] network: resolv: Remove EDNS fallback
3658 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3660 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3661 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3662 [21393] stdio: Missing dup3 error check in freopen, freopen64
3663 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3664 [21399] localedata: Bad description for U00EC in
3665 localedata/charmaps/CP1254
3666 [21411] malloc: realloc documentation error
3667 [21426] network: sys/socket.h uio.h namespace
3668 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3669 [21445] libc: signal.h bsd_signal namespace
3670 [21455] network: Network headers stdint.h namespace
3671 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3673 [21475] network: resolv: Overlong search path is truncated mid-label
3674 [21511] libc: sigstack namespace
3675 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3676 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3677 bits/syscall.h: No such file or directory
3678 [21517] libc: struct sigaltstack namespace
3679 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3680 [21533] localedata: Update locale data to Unicode 10.0
3682 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3683 junk at end of line, first unrecognized character is `@'
3684 [21538] libc: SIG_HOLD missing for XPG4
3685 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3686 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3687 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3688 [21543] libc: sigevent namespace
3689 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3690 size for general purpose registers in mcontext_t structure
3691 [21550] libc: sigwait namespace
3692 [21552] libc: XPG4 bsd_signal namespace
3693 [21554] libc: sigpause namespace
3694 [21560] libc: sys/wait.h signal.h namespace
3695 [21561] libc: waitid namespace
3696 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3697 '/usr/include/stdlib.h': Permission denied
3698 [21575] libc: sys/wait.h missing struct rusage definition
3699 [21584] libc: sigaltstack etc namespace
3700 [21597] libc: siginterrupt namespace
3701 [21607] math: hppa: FAIL: math/test-tgmath
3702 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3704 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3705 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3706 stack and heap (CVE-2017-1000366)
3707 [21625] libc: wait3 namespace
3708 [21654] nss: Incorrect pointer alignment in NSS group merge result
3710 [21657] network: Parse interface zone id for node-local multicast
3711 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3713 [21666] libc: .symver is used on common symbol
3714 [21668] network: resolv: res_init cross-thread broadcast introduces race
3716 [21687] math: tgmath.h totalorder, totalordermag return type
3717 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3719 [21696] libc: Incorrect assumption of of __cpu_mask in
3720 posix/sched_cpucount.c
3721 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3722 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3724 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3725 leading to relocation crash
3726 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3727 `resolv_conf_matches (resp, conf)' failed.
3728 [21710] localedata: Added Samoan language locale for Samoa
3729 [21711] localedata: Pashto yesstr/nostr locale are missing
3730 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3731 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3732 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3733 [21723] localedata: yesstr/nostr missing for Chinese language locale
3734 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3736 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3738 [21728] localedata: New Locale for Tongan language
3739 [21729] localedata: incorrect LC_NAME fields for hi_IN
3740 [21733] localedata: yesstr and nostr are missing for zh_HK
3741 [21734] localedata: Missing yesstr and nostr are for kw_GB
3742 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3743 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3744 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3745 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3747 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3749 [21749] localedata: Wrong abbreviated day name (“abday”) for
3751 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3752 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3753 [21759] localedata: missing yesstr and nostr for Tigrinya
3754 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3755 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3756 [21767] localedata: Missing Bislama locales
3757 [21768] localedata: Missing yesstr and nostr for aa_ET
3758 [21770] localedata: Missing Field in li_NL
3759 [21778] nptl: Robust mutex may deadlock
3760 [21779] libc: MicroBlaze segfaults when loading libpthread
3761 [21783] localedata: Fix int_select international_call_prefixes
3762 [21784] localedata: Inconsistency in country_isbn
3763 [21788] localedata: Missing Country Postal Abbreviations
3764 [21794] localedata: Added-country_isbn-for-Italy
3765 [21795] localedata: Add/Fix country_isbn for France
3766 [21796] localedata: Added country_isbn for Republic of Korea
3767 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3768 [21799] localedata: Added int_select international_call_prefixes
3769 [21801] localedata: Added int_select international_call_prefixes
3770 [21804] nptl: Double semicolon in thread-shared-types.h
3771 [21807] localedata: LC_ADDRESS fix for pap_CW
3772 [21808] localedata: Fix LC_ADDRESS for pap_AW
3773 [21821] localedata: Added country_name in mai_IN
3774 [21822] localedata: Fix LC_TIME for mai_IN
3775 [21823] localedata: missing yesstr, nostr for sa_IN
3776 [21825] localedata: Fix name_mrs for mag_IN
3777 [21828] localedata: 2.26 changelog should mention user visible changes
3779 [21835] localedata: Added Maithili language locale for Nepal
3780 [21838] localedata: Removed redundant data for the_NP
3781 [21839] localedata: Fix LC_MONETARY for ta_LK
3782 [21844] localedata: Fix Latin characters and Months Sequence.
3783 [21848] localedata: Fix mai_NP Title Name
3788 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3789 24731-2:2010, is supported to enable declarations of functions from that
3790 TR. Note that not all functions from that TR are supported by the GNU C
3793 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3794 18661-1:2014, is supported to enable declarations of functions and macros
3795 from that TS. Note that not all features from that TS are supported by
3798 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3799 18661-4:2015, is supported to enable declarations of functions and macros
3800 from that TS. Note that most features from that TS are not supported by
3803 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3804 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3805 Since the GNU C Library defaults to a much newer revision of POSIX, this
3806 will only affect programs that specifically request an old conformance
3807 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3808 see a change in the visible declarations, but a program compiled with
3809 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3812 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3813 defined by all multithreaded code, but glibc has not required this for
3816 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3817 means that in a future release, the macros “major”, “minor”, and “makedev”
3818 will only be available from <sys/sysmacros.h>.
3820 These macros are not part of POSIX nor XSI, and their names frequently
3821 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3822 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3823 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3826 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3827 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3828 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3830 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3831 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3832 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3833 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3834 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3835 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3836 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3837 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3838 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3839 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3840 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3843 * New <math.h> features are added from TS 18661-1:2014:
3845 - Signaling NaN macros: SNANF, SNAN, SNANL.
3847 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3848 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3849 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3851 - llogb functions: the llogb, llogbf and llogbl functions, and the
3852 FP_LLOGB0 and FP_LLOGBNAN macros.
3854 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3857 - Comparison macros: iseqsig.
3859 - Classification macros: iscanonical, issubnormal, iszero.
3861 - Total order functions: totalorder, totalorderf, totalorderl,
3862 totalordermag, totalordermagf, totalordermagl.
3864 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3866 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3867 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3869 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3870 are added to libc. They convert a floating-point number into string.
3872 * Most of glibc can now be built with the stack smashing protector enabled.
3873 It is recommended to build glibc with --enable-stack-protector=strong.
3874 Implemented by Nick Alcock (Oracle).
3876 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3877 intended to be used instead of memset() to erase sensitive data after use;
3878 the compiler will not optimize out calls to explicit_bzero even if they
3879 are "unnecessary" (in the sense that no _correct_ program can observe the
3880 effects of the memory clear).
3882 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3883 to float instead of double. This does not affect the ABI of any libraries
3884 that are part of the GNU C Library, but may affect the ABI of other
3885 libraries that use this type in their interfaces.
3887 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3888 float_t and double_t types are now defined to long double instead of float
3889 and double. These options are not the default, and this does not affect
3890 the ABI of any libraries that are part of the GNU C Library, but it may
3891 affect the ABI of other libraries that use this type in their interfaces,
3892 if they are compiled or used with those options.
3894 * The getentropy and getrandom functions, and the <sys/random.h> header file
3897 * The buffer size for byte-oriented stdio streams is now limited to 8192
3898 bytes by default. Previously, on Linux, the default buffer size on most
3899 file systems was 4096 bytes (and thus remains unchanged), except on
3900 network file systems, where the buffer size was unpredictable and could be
3901 as large as several megabytes.
3903 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3904 for the Linux quota interface which predates kernel version 2.4.22 has
3907 * The malloc_get_state and malloc_set_state functions have been removed.
3908 Already-existing binaries that dynamically link to these functions will
3909 get a hidden implementation in which malloc_get_state is a stub. As far
3910 as we know, these functions are used only by GNU Emacs and this change
3911 will not adversely affect already-built Emacs executables. Any undumped
3912 Emacs executables, which normally exist only during an Emacs build, should
3913 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3915 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3916 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3917 “no-ip6-dotint” had already been the default, and support for the
3918 “ip6-dotint” option was removed from the Internet in 2006.
3920 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3921 flag from <resolv.h> have been removed. The option relied on a
3922 backwards-incompatible DNS extension which was never deployed on the
3925 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3926 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3927 They were already unimplemented.
3929 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3930 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3931 removed again from the IETF name lookup interface specification in RFC
3932 2553. Applications should use getaddrinfo instead.
3934 * DNSSEC-related declarations and definitions have been removed from the
3935 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3936 decode the data part of DNSSEC record types. Previous versions of glibc
3937 only implemented minimal support for the previous version of DNSSEC, which
3938 is incompatible with the currently deployed version.
3940 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3941 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3942 <arpa/nameser.h> header file because the distinction between RR types and
3943 meta-RR types is not officially standardized, subject to revision, and
3944 thus not suitable for encoding in a macro.
3946 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3947 and rhook members of the res_state type in <resolv.h> have been removed.
3948 The glibc stub resolver did not support these hooks, but the header file
3949 did not reflect that.
3951 * For multi-arch support it is recommended to use a GCC which has
3952 been built with support for GNU indirect functions. This ensures
3953 that correct debugging information is generated for functions
3954 selected by IFUNC resolvers. This support can either be enabled by
3955 configuring GCC with '--enable-gnu-indirect-function', or by
3956 enabling it by default by setting 'default_gnu_indirect_function'
3957 variable for a particular architecture in the GCC source file
3960 * GDB pretty printers have been added for mutex and condition variable
3961 structures in POSIX Threads. When installed and loaded in gdb these pretty
3962 printers show various pthread variables in human-readable form when read
3963 using the 'print' or 'display' commands in gdb.
3965 * Tunables feature added to allow tweaking of the runtime for an application
3966 program. This feature can be enabled with the '--enable-tunables' configure
3967 flag. The GNU C Library manual has details on usage and README.tunables has
3968 instructions on adding new tunables to the library.
3970 * A new version of condition variables functions have been implemented in
3971 the NPTL implementation of POSIX Threads to provide stronger ordering
3974 * A new version of pthread_rwlock functions have been implemented to use a more
3975 scalable algorithm primarily through not using a critical section anymore to
3978 Security related changes:
3980 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3981 have been created with makecontext could fail to terminate due to a
3982 missing .cantunwind annotation. This has been observed to lead to a hang
3983 (denial of service) in some Go applications compiled with gccgo. Reported
3984 by Andreas Schwab. (CVE-2016-6323)
3986 * The DNS stub resolver functions would crash due to a NULL pointer
3987 dereference when processing a query with a valid DNS question type which
3988 was used internally in the implementation. The stub resolver now uses a
3989 question type which is outside the range of valid question type values.
3992 The following bugs are resolved with this release:
3994 [4099] stdio: Overly aggressive caching by stream i/o functions.
3995 [7065] build: Support building glibc with -fstack-protector or -fstack-
3997 [9842] localedata: en_CA: incorrect date format
3998 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3999 before it started waiting
4000 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4001 [15765] nptl: sem_open is wrongly a cancellation point
4002 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4003 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4005 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4006 library linked with pthread
4007 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4008 "FIXME: Ingo" issue)
4009 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4010 [17252] libc: getrandom and getentropy syscall
4011 [17730] malloc: thread-local storage is sometimes improperly free()'d
4012 after being __libc_memalign()'d
4013 [18241] stdio: failed fseek on memstream does not set errno and can fail
4015 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4017 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4018 PTHREAD_PRIO_INHERIT mutex on ARM
4019 [18784] network: res_query and related function crash for special record
4020 type queries (CVE-2015-5180)
4021 [19380] math: strtod does not raise "inexact"
4022 [19387] string: Integer overflow in memchr
4023 [19390] string: Integer overflow in strncat
4024 [19398] build: linknamespace tests fail with massively parallel build
4025 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4027 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4028 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4029 [19514] libc: [PATCH] Fix spelling errors in spelling
4030 "implement"/"implementation" in several places
4031 [19582] network: Deprecate RES_USE_INET6
4032 [19673] manual: clog10 docs appear to be erroneous
4033 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4034 causes a segmentation fault
4035 [19826] libc: invalid pointer returned from __tls_get_addr with static
4037 [20016] network: resolv: Remove hooks support from the API
4038 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4040 [20033] math: [x86_64] vectorized math function don't call the __finite
4042 [20116] nptl: use after free in pthread_create
4043 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4044 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4046 [20311] nptl: please install proc_service.h
4047 [20366] libc: Compilation errors in installed headers in strict-compliance
4049 [20370] malloc: malloc: Arena free list management is still racy
4050 (incorrect fix in bug 19243)
4051 [20386] libc: assert (X = 0) does not result in GCC warning
4052 [20432] malloc: malloc: Minimize interface required for interposition
4053 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4054 in _Unwind_Backtrace (CVE-2016-6323)
4055 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4056 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4058 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4059 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4060 [20477] network: resolv: incorrect double-checked locking related to
4062 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4064 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4066 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4067 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4068 cause transition penalty
4069 [20517] math: sparcv9 missing fdiml compat symbol
4070 [20524] manual: strverscmp is inconsistent
4071 [20525] libc: <sys/quota.h> should be based on kernel headers
4072 [20539] math: GCC 7 -static -lm fails to link at -O3
4073 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4075 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4077 [20591] network: Remove obsolete DNSSEC support
4078 [20592] network: DNS resource record type classification macros in
4079 <arpa/nameser.h> are incorrect
4080 [20593] network: Update DNS RR type definitions
4081 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4082 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4084 [20629] network: libresolv: Remove support for bitstring labels
4086 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4087 assertion: "maxidx >= 2"
4088 [20660] math: [arm] Use VSQRT
4089 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4090 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4091 [20689] libc: Test for FMA should also check for AVX.
4092 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4093 [20715] math: iszero macro breaks existing code
4094 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4095 [20728] libc: powerpc: Missing TOC stub in clone
4096 [20729] build: glibc-2.24 fails to build for i486 with -Os
4097 [20750] build: Build fails with default PIE enabled gcc-6.x
4098 [20768] math: [alpha] sqrt fegetenv namespace
4099 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4101 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4102 __FLT_EVAL_METHOD__ is 2
4103 [20790] network: rpcgen buffer overrun in get_prog_declaration
4104 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4105 [20829] libc: crypt snprintf namespace
4106 [20847] libc: tst-vfork3 failure
4107 [20855] math: Default bits/mathdef.h has inappropriate float_t
4108 [20859] math: [sh4] FP_ILOGB0 invalid
4109 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4110 U+20AC), not same as GBK
4111 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4112 [20916] math: pow handling of sNaN arguments
4113 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4114 [20919] math: Bad pow (qNaN, 0) result with -lieee
4115 [20940] math: hypot sNaN handling
4116 [20947] math: fmax, fmin sNaN handling
4117 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4118 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4120 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4121 [20973] nptl: robust mutexes: Lost wake-ups
4122 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4123 [20978] nis: strlen on null pointer in nss_nisplus
4124 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4126 [21014] string: i686 memchr overflows internal pointer check
4127 [21019] libc: [mips] n32 lseek incorrect on overflow
4128 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4129 [21026] libc: [MIPS] readahead syscall is broken on n64
4130 [21028] math: Fallback fesetexceptflag should always succeed
4131 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4132 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4134 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4135 [21061] librt: [microblaze] librt lost clock_* exports
4136 [21073] libc: tunables: insecure environment variables passed to
4137 subprocesses with AT_SECURE
4138 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4142 * The minimum Linux kernel version that this version of the GNU C Library
4143 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4144 kernel version 2.6.32 or later suffices (on architectures that already
4145 required kernel versions more recent than 3.2, those requirements remain
4146 unchanged). Linux 3.2 or later kernel headers are required on all
4149 * The pap_AN locale has been deleted. This has been deprecated for a long
4150 time. It has been replaced by pap_AW & pap_CW, both of which have long
4151 been included in previous releases.
4153 * The readdir_r and readdir64_r functions have been deprecated. It is
4154 recommended to use readdir and readdir64 instead.
4156 * The type “union wait” has been removed. It was deprecated in the early
4157 1990s and never part of POSIX. Application code should use the int type
4158 instead of “union wait”.
4160 * A new NSS action is added to facilitate large distributed system
4161 administration. The action, MERGE, allows remote user stores like LDAP
4162 to be merged into local user stores like /etc/groups in order to provide
4163 easy to use, updated, and managed sets of merged credentials. The new
4164 action can be used by configuring it in /etc/nsswitch.conf:
4165 group: files [SUCCESS=merge] nis
4166 Implemented by Stephen Gallagher (Red Hat).
4168 * The deprecated __malloc_initialize_hook variable has been removed from the
4171 * The long unused localedef --old-style option has been removed. It hasn't
4172 done anything in over 16 years. Scripts using this option can safely
4175 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4176 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4177 return the next representable value in the direction of positive infinity
4178 and the nextdown functions return the next representable value in the
4179 direction of negative infinity. These are currently enabled as GNU
4182 Security related changes:
4184 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4185 could result in a stack overflow when getnetbyname was called with an
4186 overly long name. (CVE-2016-3075)
4188 * Previously, getaddrinfo copied large amounts of address data to the stack,
4189 even after the fix for CVE-2013-4458 has been applied, potentially
4190 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4191 instead. Reported by Michael Petlan. (CVE-2016-3706)
4193 * The glob function suffered from a stack-based buffer overflow when it was
4194 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4195 Reported by Alexander Cherepanov. (CVE-2016-1234)
4197 * The Sun RPC UDP client could exhaust all available stack space when
4198 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4199 alloca plugin for GCC. (CVE-2016-4429)
4201 * The IPv6 name server management code in libresolv could result in a memory
4202 leak for each thread which is created, performs a failing naming lookup,
4203 and exits. Over time, this could result in a denial of service due to
4204 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4206 The following bugs are resolved with this release:
4208 [1170] localedata: ne_NP: update Nepali locale definition file
4209 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4211 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4212 [6796] math: fdim() does not set errno on overflow
4213 [10354] libc: posix_spawn should use vfork() in more cases than presently
4214 [11213] localedata: localedata: add copyright disclaimer to locale files
4215 [12143] localedata: chr_US: new Cherokee locale
4216 [12450] localedata: sgs_LT: new locale
4217 [12676] localedata: ln_CD: new locale
4218 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4220 [13304] math: fma, fmaf, fmal produce wrong results
4221 [14259] build: --localedir arg to configure is ignored
4222 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4223 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4224 [14934] localedata: es_CL: wrong first weekday chilean locale
4225 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4227 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4229 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4230 [15368] nptl: raise() is not async-signal-safe
4231 [15479] math: ceil, floor, round and trunc raise inexact exception
4232 [15578] localedata: kk_KZ: various updates
4233 [16003] localedata: pap_AN: punt old locale
4234 [16137] localedata: iw_IL: punt old locale
4235 [16190] localedata: eo: new esperanto locale
4236 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4237 [16742] malloc: race condition: pthread_atfork() called before first
4238 malloc() results in unexpected locking behaviour/deadlocks
4239 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4241 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4242 [17565] localedata: pt_PT: wrong (work-)week start
4243 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4244 [17950] build: Build fails with -msse
4245 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4246 [18433] libc: posix_spawn does not return correctly upon failure to
4248 [18453] localedata: charmaps/IBM875: incorrect codes
4249 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4251 [18896] localedata: he_IL: improvements for currency
4252 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4253 Romanian locale data
4254 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4256 [19056] libc: Deprecate readdir_r
4257 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4259 [19198] localedata: nl_NL: small improvements for Dutch locales
4260 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4261 nameservers (CVE-2016-5417)
4262 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4264 [19400] locale: Language missing in "iso-639.def", trivial fix in
4266 [19431] malloc: Deadlock between fflush, getdelim, and fork
4267 [19505] libc: Incorrect file descriptor validity checks in
4268 posix_spawn_file_actions_add{open,close,dup2}
4269 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4270 when using RTLD_NEXT
4271 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4272 `intl/{gettextP,loadinfo}.h'
4273 [19534] libc: execle, execlp may use malloc
4274 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4275 [19573] network: res_nclose and __res_maybe_init disagree about name
4276 server initialization, breaking Hesiod
4277 [19575] localedata: Status of GB18030 tables
4278 [19581] localedata: sr_* date_fmt string contains additional newline
4279 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4281 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4282 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4283 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4284 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4286 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4288 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4290 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4291 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4292 [19633] locale: strfmon_l applies global locale to number formatting
4293 [19642] network: Memory leak in getnameinfo
4294 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4295 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4297 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4298 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4300 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4301 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4303 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4305 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4307 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4308 pointers and lengths in error-case.
4309 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4310 report errors on UTF-16 surrogates values.
4311 [19755] nscd: nscd assertion failure in gc
4312 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4313 [19759] libc: mempcpy shouldn't be inlined
4314 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4315 [19765] libc: s390 needs an optimized mempcpy
4316 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4317 NAME_MAX limit assumption (CVE-2016-1234)
4318 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4319 [19787] network: Missing and incorrect truncation checks in getnameinfo
4320 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4322 [19791] network: Assertion failure in res_query.c with un-connectable name
4324 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4325 [19822] math: libm.so install clobbers old version
4326 [19825] network: resolv: send_vc can return uninitialized data in second
4327 response to getaddrinfo
4328 [19830] network: nss_dns: should check RDATA length against buffer length
4329 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4330 confronted with A/AAAA records of invalid size
4331 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4332 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4333 [19853] stdio: Printing IBM long double in decimal with high precision is
4335 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4336 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4337 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4339 [19865] network: Assertion failure or memory leak in
4340 _nss_dns_getcanonname_r
4341 [19868] network: nss_dns: netent code does not skip over non-PTR records
4342 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4344 [19881] string: Improve x86-64 memset
4345 [19907] string: Incorrect memcpy tests
4346 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4348 [19925] libc: termios.h XCASE namespace
4349 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4350 [19929] libc: limits.h NL_NMAX namespace
4351 [19931] stdio: Memory leak in vfprintf
4352 [19957] libc: clone(CLONE_VM) access invalid parent memory
4353 [19963] localedata: en_IL: New locale
4354 [19989] stdio: stdio.h cuserid namespace
4355 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4357 [19996] locale: langinfo.h nl_langinfo_l namespace
4358 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4359 [20010] network: getaddrinfo: Stack overflow in hostent translation
4361 [20012] stdio: libio: fmemopen append mode failure
4362 [20014] stdio: stdio.h namespace for pre-threads POSIX
4363 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4364 [20023] libc: fcntl.h timespec namespace
4365 [20024] math: [x86_64] vectorized sincos trashes the stack
4366 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4367 [20041] time: sys/time.h timespec namespace
4368 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4369 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4370 [20051] libc: ttyslot in wrong header under wrong conditions
4371 [20054] libc: gethostname not declared for XPG4
4372 [20055] libc: termios.h missing tcgetsid for XPG4
4373 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4375 [20073] libc: sys/stat.h fchmod namespace
4376 [20074] libc: stdlib.h rand_r namespace
4377 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4378 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4380 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4381 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4383 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4384 [20119] libc: Wrong mask for processors level type from CPUID
4385 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4386 AS not supporting AVX512
4387 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4389 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4390 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4392 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4393 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4394 [20178] libc: posix_spawn{p} should not call exit
4395 [20191] stdio: libio: vtables hardening
4396 [20195] string: FMA4 detection requires CPUID execution with register
4398 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4399 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4401 [20212] math: acos (sNaN) returns sNaN
4402 [20213] math: asin (sNaN) returns sNaN
4403 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4404 [20218] math: [i386] asinhl (sNaN) returns sNaN
4405 [20219] math: [i386] atanhl (sNaN) returns sNaN
4406 [20222] stdio: fopencookie: Mangle function pointers
4407 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4408 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4409 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4411 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4412 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4413 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4414 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4415 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4416 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4417 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4418 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4419 [20240] math: modf (sNaN) returns sNaN
4420 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4421 [20250] math: frexp (sNaN) returns sNaN
4422 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4423 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4425 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4426 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4427 subscript is below array bounds [-Werror=array-bounds]
4428 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4429 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4431 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4432 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4434 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4435 "invalid" exceptions
4436 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4437 [20316] localedata: id_ID: Februari instead of Pebruari
4438 [20327] string: POWER8 strcasecmp returns incorrect result
4439 [20347] math: Failure: Test: j0_downward (0xap+0)
4440 [20348] libc: FAIL: misc/tst-preadvwritev64
4441 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4442 [20350] libc: There is no test for p{read,write}64
4443 [20357] math: Incorrect cos result for 1.5174239687223976
4444 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4448 * Unicode 8.0.0 Support: Character encoding, character type info, and
4449 transliteration tables are all updated to Unicode 8.0.0, using new
4450 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4451 These updates cause user visible changes, such as the fixes for bugs
4452 89, 16061, and 18568.
4454 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4455 kernel-internal CPU set size. This means that requests that change the
4456 CPU affinity which failed before (for example, an all-ones CPU mask) will
4457 now succeed. Applications that need to determine the effective CPU
4458 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4459 setting it because the kernel can adjust it (and the previous size check
4460 would not detect this in the majority of cases).
4462 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4463 the following new symbols are used: fts64_children, fts64_close,
4464 fts64_open, fts64_read and fts64_set.
4466 * getaddrinfo now detects certain invalid responses on an internal netlink
4467 socket. If such responses are received, an affected process will
4468 terminate with an error message of "Unexpected error <number> on netlink
4469 descriptor <number>" or "Unexpected netlink response of size <number> on
4470 descriptor <number>". The most likely cause for these errors is a
4471 multi-threaded application which erroneously closes and reuses the netlink
4472 file descriptor while it is used by getaddrinfo.
4474 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4475 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4476 unnecessary serialization of memory allocation requests across threads.
4477 The defect is now corrected. Users should see a substantial increase in
4478 the concurrent throughput of allocation requests for applications which
4479 trigger this bug. Affected applications typically create and
4480 destroy threads frequently. (Bug 19048 was reported and analyzed by
4483 * There is now a --disable-timezone-tools configure option for disabling the
4484 building and installing of the timezone related utilities (zic, zdump, and
4485 tzselect). This is useful for people who build the timezone data and code
4486 independent of the GNU C Library.
4488 * The obsolete header <regexp.h> has been removed. Programs that require
4489 this header must be updated to use <regex.h> instead.
4491 * The obsolete functions bdflush, create_module, get_kernel_syms,
4492 query_module and uselib are no longer available to newly linked binaries;
4493 the header <sys/kdaemon.h> has been removed. These functions and header
4494 were specific to systems using the Linux kernel and could not usefully be
4495 used with the GNU C Library on systems with version 2.6 or later of the
4498 * Optimized string, wcsmbs and memory functions for IBM z13.
4499 Implemented by Stefan Liebler.
4501 * Newly linked programs that define a variable called signgam will no longer
4502 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4503 require signgam to be set by those functions must ensure that they use the
4504 variable provided by the GNU C Library and declared in <math.h>, without
4505 defining their own copy.
4507 * The minimum GCC version that can be used to build this version of the GNU
4508 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4509 still be used to compile programs using the GNU C Library.
4511 Security related changes:
4513 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4514 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4516 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4517 the pointer guard feature. It is always enabled. Previously,
4518 LD_POINTER_GUARD could be used to disable security hardening in binaries
4519 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4522 * An integer overflow in hcreate and hcreate_r could lead to an
4523 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4525 * The catopen function no longer has unbounded stack usage. Reported by
4526 Max. (CVE-2015-8779)
4528 * The nan, nanf and nanl functions no longer have unbounded stack usage
4529 depending on the length of the string passed as an argument to the
4530 functions. Reported by Joseph Myers. (CVE-2014-9761)
4532 * A stack-based buffer overflow was found in libresolv when invoked from
4533 libnss_dns, allowing specially crafted DNS responses to seize control
4534 of execution flow in the DNS client. The buffer overflow occurs in
4535 the functions send_dg (send datagram) and send_vc (send TCP) for the
4536 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4537 family. The use of AF_UNSPEC triggers the low-level resolver code to
4538 send out two parallel queries for A and AAAA. A mismanagement of the
4539 buffers used for those queries could result in the response of a query
4540 writing beyond the alloca allocated buffer created by
4541 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4542 the overflow. Thanks to the Google Security Team and Red Hat for
4543 reporting the security impact of this issue, and Robert Holiday of
4544 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4546 The following bugs are resolved with this release:
4548 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4549 [887] math: Math library function "logb" and "nextafter" inconsistent
4550 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4551 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4552 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4553 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4555 [4404] localedata: German translation of "Alarm clock" is misleading
4556 [6799] math: nextafter() and nexttoward() doesn't set errno on
4557 overflow/underflow errors
4558 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4560 [10432] nis: _nss_nis_setnetgrent assertion failure
4561 [11460] libc: fts has no LFS support
4562 [12926] network: getaddrinfo()/make_request() may spin forever
4563 [13065] nptl: Race condition in pthread barriers
4564 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4565 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4567 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4568 [14912] libc: Rename non-installed bits/*.h headers
4569 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4570 [15367] math: Let gcc use __builtin_isinf
4571 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4572 [15421] math: lgamma wrongly sets signgam for ISO C
4573 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4574 FE_INVALID with argument out of range
4575 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4577 [15786] dynamic-link: ifunc resolver functions can smash function
4579 [15918] math: Unnecessary check for equality in hypotf()
4580 [16061] localedata: Review / update transliteration data
4581 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4583 [16141] time: strptime %z offset restriction
4584 [16171] math: drem should be alias of remainder
4585 [16296] math: fegetround is pure?
4586 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4587 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4589 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4590 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4592 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4593 "Exception "Inexact" set" on ppc32
4594 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4595 [16517] math: Missing underflow exception from tanf/tan/tanl
4596 [16519] math: Missing underflow exception from sinhf
4597 [16520] math: Missing underflow exception from tanhf
4598 [16521] math: Missing underflow exception from exp2
4599 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4601 [16734] stdio: fopen calls mmap to allocate its buffer
4602 [16961] math: nan function incorrect handling of bad sequences
4603 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4604 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4605 [16985] locale: localedef: confusing error message when opening output
4607 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4608 [17197] locale: Redundant shift character in iconv conversion output at
4610 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4611 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4612 [17250] dynamic-link: static linking breaks nss loading
4613 (getaddrinfo/getpwnam/etc...)
4614 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4616 [17441] math: isnan() should use __builtin_isnan() in GCC
4617 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4618 (related to lock elision)
4619 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4620 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4621 [17887] time: strptime should be able to parse "+01:00" style timezones
4622 [17905] libc: catopen() Multiple unbounded stack allocations
4624 [18084] libc: backtrace (..., 0) dumps core on x86
4625 [18086] libc: nice() sets errno to 0 on success
4626 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4627 is too large (CVE-2015-8778)
4628 [18251] dynamic-link: SONAME missing when audit modules provides path
4629 [18265] libc: add attributes for wchar string and memory functions
4630 [18370] math: csqrt missing underflows
4631 [18421] libc: [hppa] read-only segment has dynamic relocations
4632 [18472] libc: Obsolete syscall wrappers should be compat symbols
4633 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4634 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4635 [18525] localedata: Remove locale timezone information
4636 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4637 [18568] localedata: Update locale data to Unicode 8.0
4638 [18589] locale: sort-test.sh fails at random
4639 [18595] math: ctan, ctanh missing underflows
4640 [18604] libc: assert macro-expands its argument
4641 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4642 contains a vector instruction exception.
4643 [18611] math: j1, jn missing errno setting on underflow
4644 [18618] localedata: sync Chechen locale definitions with other *_RU
4646 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4647 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4648 [18665] network: In send_dg, the recvfrom function is NOT always using the
4649 buffer size of a newly created buffer (CVE-2015-7547)
4650 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4652 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4654 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4655 [18699] math: tilegx cproj() for various complex infinities does not yield
4657 [18724] libc: Harden put*ent functions against data injection
4658 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4659 [18755] build: build errors with -DNDEBUG
4660 [18757] stdio: fmemopen fails to set errno on failure
4661 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4663 [18781] libc: openat64 lacks O_LARGEFILE
4664 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4665 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4666 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4667 [18790] math: [ldbl-128ibm] tanhl inaccurate
4668 [18795] libc: stpncpy fortification misses buffer lengths that are
4669 statically too large
4670 [18796] build: build fails for --disable-mathvec
4671 [18803] math: hypot missing underflows
4672 [18820] stdio: fmemopen may leak memory on failure
4673 [18823] math: csqrt spurious underflows
4674 [18824] math: fma spurious underflows
4675 [18825] math: pow missing underflows
4676 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4677 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4678 [18870] build: sem_open.c fails to compile with missing symbol
4680 [18872] stdio: Fix memory leak in printf_positional
4681 [18873] libc: posix_fallocate overflow check ineffective
4682 [18875] math: Excess precision leads incorrect libm
4683 [18877] libc: arm: mmap offset regression
4684 [18887] libc: memory corruption when using getmntent on blank lines
4685 [18918] localedata: hu_HU: change time to HH:MM:SS format
4686 [18921] libc: Regression: extraneous stat() and fstat() performed by
4688 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4689 binaries (CVE-2015-8777)
4690 [18951] math: tgamma missing underflows
4691 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4693 [18953] localedata: lt_LT: change currency symbol to the euro
4694 [18956] math: powf inaccuracy
4695 [18961] math: [i386] exp missing underflows
4696 [18966] math: [i386] exp10 missing underflows
4697 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4698 [18969] build: multiple string test failures due to missing locale
4700 [18970] libc: Reference of pthread_setcancelstate in libc.a
4701 [18977] math: float / long double Bessel functions not in XSI POSIX
4702 [18980] math: i386 libm functions return with excess range and precision
4703 [18981] math: i386 scalb*, ldexp return with excess range and precision
4704 [18982] stdio: va_list and vprintf
4705 [18985] time: Passing out of range data to strftime() causes a segfault
4707 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4708 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4709 [19012] locale: iconv_open leaks memory on error path
4710 [19016] math: clog, clog10 inaccuracy
4711 [19018] nptl: Mangle function pointers in tls_dtor_list
4712 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4713 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4714 [19048] malloc: malloc: arena free list can become cyclic, increasing
4716 [19049] math: [powerpc] erfc incorrect zero sign
4717 [19050] math: [powerpc] log* incorrect zero sign
4718 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4719 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4720 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4721 [19074] network: Data race in _res_hconf_reorder_addrs
4722 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4723 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4724 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4726 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4728 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4729 [19086] manual: posix_fallocate64 documented argument order is wrong.
4730 [19088] math: lround, llround missing exceptions close to overflow
4732 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4733 [19095] math: dbl-64 lrint incorrect for 64-bit long
4734 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4735 [19124] dynamic-link: ld.so failed to build with older assembler
4736 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4737 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4738 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4739 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4740 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4741 pthread_setaffinity_np
4742 [19156] math: [ldbl-128] j0l spurious underflows
4743 [19164] nptl: tst-getcpu fails with many possible CPUs
4744 [19168] math: math/test-ildoubl and math/test-ldouble failure
4745 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4746 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4748 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4749 (FE_NOMASK_ENV) do not clear SSE exceptions
4750 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4751 _int_new_arena/reused_arena
4752 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4753 [19201] math: dbl-64 remainder incorrect sign of zero result
4754 [19205] math: bits/math-finite.h conditions do not match math.h and
4756 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4757 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4758 for C99-based standards
4759 [19212] libc: features.h not -Wundef clean
4760 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4762 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4763 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4764 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4766 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4767 "inexact" exceptions
4768 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4770 [19242] libc: strtol incorrect in Turkish locales
4771 [19243] malloc: reused_arena can pick an arena on the free list, leading
4772 to an assertion failure and reference count corruption
4773 [19253] time: tzset() ineffective when temporary TZ did not include DST
4775 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4776 [19270] math: [hppa] Shared libm missing __isnanl
4777 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4778 MAP_HUGETLB and MAP_STACK defines
4779 [19313] nptl: Wrong __cpu_mask for x32
4780 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4781 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4782 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4783 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4784 [19363] time: x32: times() return value wrongly truncates/sign extends
4786 [19367] dynamic-link: Improve branch prediction on Silvermont
4787 [19369] network: Default domain name not reset by res_ninit when "search"
4788 / "domain" entry is removed from resolv.conf
4789 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4791 [19385] localedata: bg_BG: time separator should be colon, not comma
4792 [19408] libc: linux personality syscall wrapper may erroneously return an
4793 error on 32-bit architectures
4794 [19415] libc: dladdr returns wrong names on hppa
4795 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4796 IBM905, IBM907, and IBM909
4797 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4798 [19443] build: build failures with -DDEBUG
4799 [19451] build: Make check fails on test-double-vlen2
4800 [19462] libc: Glibc failed to build with -Os
4801 [19465] math: Wrong code with -Os
4802 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4804 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4806 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4807 [19486] math: S390: Math tests fail with "Exception Inexact set".
4808 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4809 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4811 [19590] math: Fail to build shared objects that use libmvec.so functions.
4815 * The following bugs are resolved with this release:
4817 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4818 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4819 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4820 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4821 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4822 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4823 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4824 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4825 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4826 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4827 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4828 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4829 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4830 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4831 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4832 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4833 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4834 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4835 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4836 18657, 18676, 18694, 18696, 18887.
4838 * Cache information can be queried via sysconf() function on s390 e.g. with
4839 _SC_LEVEL1_ICACHE_SIZE as argument.
4841 * A buffer overflow in gethostbyname_r and related functions performing DNS
4842 requests has been fixed. If the NSS functions were called with a
4843 misaligned buffer, the buffer length change due to pointer alignment was
4844 not taken into account. This could result in application crashes or,
4845 potentially arbitrary code execution, using crafted, but syntactically
4846 valid DNS responses. (CVE-2015-1781)
4848 * The time zone file parser has been made more robust against crafted time
4849 zone files, avoiding heap buffer overflows related to the processing of
4850 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4851 large time zone data files. Overly long time zone specifiers in the TZ
4852 variable no longer result in stack overflows and crashes.
4854 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4855 for LD and GD on x86 and x86-64, has been implemented. You will need
4856 binutils-2.24 or later to enable this optimization.
4858 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4859 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4860 Hat). These updates cause user visible changes, such as the fix for bug
4863 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4864 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4865 condition in some applications.
4867 * Added vector math library named libmvec with the following vectorized x86_64
4868 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4870 The library can be disabled with --disable-mathvec. Use of the functions is
4871 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4872 Shared library libmvec.so is linked in as needed when using -lm (no need to
4873 specify -lmvec explicitly for not static builds).
4874 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4876 * A new fmemopen implementation has been added with the goal of POSIX
4877 compliance. The new implementation fixes the following long-standing
4878 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4879 old implementation is still present for use be by existing binaries.
4881 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4882 releases. It has been fixed to match 2.19 and older, but binaries built
4883 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4885 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4886 Contributed by Roland McGrath (Google).
4888 * The header <regexp.h> is deprecated, and will be removed in a future
4889 release. Use of this header will trigger a deprecation warning.
4890 Application developers should update their code to use <regex.h> instead.
4892 This header was formerly part of SUS, but was deprecated in 1994 and
4893 removed from the standard in 2001. Also, the glibc implementation
4894 leaks memory. See BZ#18681 for more details.
4898 * The following bugs are resolved with this release:
4900 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4901 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4902 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4903 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4904 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4905 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4906 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4907 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4908 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4909 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4912 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4913 too little memory for the to-be-scanned arguments and overflow the
4914 allocated buffer. The implementation now correctly computes the required
4915 buffer size when using malloc, and switches to malloc from alloca as
4918 * A new semaphore algorithm has been implemented in generic C code for all
4919 machines. Previous custom assembly implementations of semaphore were
4920 difficult to reason about or ensure that they were safe. The new version
4921 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4922 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4923 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4925 * Port to Altera Nios II has been contributed by Mentor Graphics.
4927 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4928 implementations for powerpc64/powerpc64le.
4929 Implemented by Adhemerval Zanella (IBM).
4931 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4932 and powerpc64le. This may improve lock scaling of existing programs on
4933 HTM capable systems. The lock elision code is only enabled with
4934 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4935 powerpc will issue a transaction abort on every syscall to avoid side
4936 effects being visible outside transactions.
4938 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4939 AArch64. Contributed by ARM Ltd.
4941 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4943 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4944 under certain input conditions resulting in the execution of a shell for
4945 command substitution when the application did not request it. The
4946 implementation now checks WRDE_NOCMD immediately before executing the
4947 shell and returns the error WRDE_CMDSUB as expected.
4949 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4950 processing format strings with a large number of format specifiers.
4952 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4953 infinite loop if the DNS response contained a PTR record of an unexpected
4956 * The minimum GCC version that can be used to build this version of the GNU
4957 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4958 still be used to compile programs using the GNU C Library.
4960 * The GNU C Library is now built with -Werror by default. This can be
4961 disabled by configuring with --disable-werror.
4963 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4965 * The obsolete sigvec function has been removed. This was the original
4966 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4967 programs have been using instead for about 25 years. Of course, ABI
4968 compatibility for old binaries using sigvec remains intact.
4970 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4971 with newer versions of bison.
4973 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4974 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4975 registers overlay two consecutive single-precision registers. MIPS32R2
4976 introduced a new FPU mode (FR=1) where double-precision registers extend the
4977 corresponding single-precision registers which is incompatible with the
4978 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4979 require the use of FR=1 making a transition necessary. New o32 ABI
4980 extensions enable users to migrate over time from the original o32 ABI
4981 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4982 tracks the ABI of any loaded object and verifies that new objects are
4983 compatible. Mode transitions will also be requested as required and
4984 unsupportable objects will be rejected. The ABI checks include both soft and
4985 hard float ABIs for o32, n32 and n64.
4987 GCC 5 with GNU binutils 2.25 onwards:
4988 It is strongly recommended that all o32 system libraries are built using the
4989 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4990 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4991 compiler using --with-fp-32=xx to set this by default.
4995 * The following bugs are resolved with this release:
4997 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4998 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4999 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5000 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5001 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5002 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5003 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5004 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5005 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5006 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5007 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5008 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5009 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5010 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5011 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5013 * Reverted change of ABI data structures for s390 and s390x:
5014 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5015 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5016 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5017 are preserved pointing straight to the same implementation as the old ones.
5018 Given that, new callers will simply provide a too-big buffer to these
5019 functions. Any applications/libraries out there that embed jmp_buf or
5020 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5021 against 2.19 headers will have to rebuilt again. This is necessary in any
5022 case to revert the breakage in their ABI caused by the glibc change.
5024 * Support for file description locks is added to systems running the
5025 Linux kernel. The standard file locking interfaces are extended to
5026 operate on file descriptions, not file descriptors, via the use of
5027 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5028 are associated with an open file instead of a process.
5030 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5032 * The minimum Linux kernel version that this version of the GNU C Library
5033 can be used with is 2.6.32.
5035 * Running the testsuite no longer terminates as soon as a test fails.
5036 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5037 with PASS or FAIL lines for individual tests. A summary of the results is
5038 printed, including a list of failing lists, and "make check" exits with
5039 error status if there were any unexpected failures. "make check
5040 stop-on-test-failure=y" may be used to keep the old behavior.
5042 * The am33 port, which had not worked for several years, has been removed
5045 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5046 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5047 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5048 conflicted with POSIX (support for which was removed in 2.19), the
5049 interfaces those macros enabled remain available when compiling with
5050 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5051 test macros defined.
5053 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5055 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5056 This may improve lock scaling of existing programs on TX capable systems.
5057 The lock elision code is only built with --enable-lock-elision=yes and
5058 then requires a GCC version supporting the TX builtins. With lock elision
5059 default mutexes are elided via __builtin_tbegin, if the cpu supports
5060 transactions. By default lock elision is not enabled and the elision code
5063 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5064 copy the path argument. This allowed programs to cause posix_spawn to
5065 deference a dangling pointer, or use an unexpected pathname argument if
5066 the string was modified after the posix_spawn_file_actions_addopen
5069 * All supported architectures now use the main glibc sysdeps directory
5070 instead of some being in a separate "ports" directory (which was
5071 distributed separately before glibc 2.17).
5073 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5074 On configurations that support it (all Linux configurations), it's now
5075 used regardless of the --enable-add-ons switch to configure. It is no
5076 longer possible to build such configurations without pthreads support.
5078 * Locale names, including those obtained from environment variables (LANG
5079 and the LC_* variables), are more tightly checked for proper syntax.
5080 setlocale will now fail (with EINVAL) for locale names that are overly
5081 long, contain slashes without starting with a slash, or contain ".." path
5082 components. (CVE-2014-0475) Previously, some valid locale names were
5083 silently replaced with the "C" locale when running in AT_SECURE mode
5084 (e.g., in a SUID program). This is no longer necessary because of the
5087 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5088 with application code using Intel MPX instructions. (With all previous
5089 versions, the MPX register state could be clobbered when making calls
5090 into or out of a shared library.) Note that while the new dynamic
5091 linker is compatible with all known x86 hardware whether or not it
5092 supports Intel MPX, some x86 instruction-set emulators might fail to
5093 handle the new instruction encodings. This is known to affect Valgrind
5094 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5095 release), and might affect other tools that do instruction emulation.
5097 * Support for loadable gconv transliteration modules has been removed.
5098 The support for transliteration modules has been non-functional for
5099 over a decade, and the removal is prompted by security defects. The
5100 normal gconv conversion modules are still supported. Transliteration
5101 with //TRANSLIT is still possible, and the //IGNORE specifier
5102 continues to be supported. (CVE-2014-5119)
5104 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5105 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5106 resulting a denial-of-service security vulnerability in applications which
5107 use functions related to iconv. (CVE-2014-6040)
5111 * The following bugs are resolved with this release:
5113 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5114 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5115 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5116 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5117 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5118 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5119 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5120 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5121 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5122 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5123 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5124 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5125 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5126 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5127 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5128 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5129 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5130 16431, 16453, 16474, 16506, 16510, 16529
5132 * Slovenian translations for glibc messages have been contributed by the
5133 Translation Project's Slovenian team of translators.
5135 * The public headers no longer use __unused nor __block. This change is to
5136 support compiling programs that are derived from BSD sources and use
5137 __unused internally, and to support compiling with Clang's -fblock
5138 extension which uses __block.
5140 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5141 large collation sequences to optimize multiple passes. This cache
5142 computation may overflow for large collation sequences and may cause a
5143 stack or buffer overflow. This is now fixed to use a slower algorithm
5144 which does not use a cache if there is an integer overflow.
5146 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5147 rules for large collation sequences to optimize multiple passes and falls
5148 back to alloca if malloc fails, resulting in a possible stack overflow.
5149 The implementation now falls back to an uncached collation sequence lookup
5152 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5153 initialized for static applications resulting in the security feature
5154 being disabled. The pointer guard is now correctly initialized to a
5155 random value for static applications. Existing static applications need
5156 to be recompiled to take advantage of the fix (bug 15754).
5158 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5159 to the d_name member of struct dirent, or omit the terminating NUL
5160 character. (Bugzilla #14699).
5162 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5163 aligned_alloc functions could allocate too few bytes or corrupt the
5164 heap when passed very large allocation size values (Bugzilla #15855,
5167 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5168 for AF_INET6 has been fixed (Bugzilla #16072).
5170 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5171 pap_CW, quz_PE, the_NP.
5173 * Substantially revised locales: gd_GB, ht_HT
5175 * The LC_ADDRESS field was updated to support country_car for almost all
5178 * ISO 1427 definitions were updated.
5180 * ISO 3166 definitions were updated.
5182 * The localedef utility now supports --big-endian and --little-endian
5183 command-line options to generate locales for a different system from that
5184 for which the C library was built.
5186 * Binary locale files now only depend on the endianness of the system for
5187 which they are generated and not on other properties of that system. As a
5188 consequence, binary files generated with new localedef may be incompatible
5189 with old versions of the GNU C Library, and binary files generated with
5190 old localedef may be incompatible with this version of the GNU C Library,
5191 in the following circumstances:
5193 + Locale files may be incompatible on m68k systems.
5195 + Locale archive files (but not separate files for individual locales) may
5196 be incompatible on systems where plain "char" is signed.
5198 * The configure option --disable-versioning has been removed. Builds with
5199 --disable-versioning had not worked for several years.
5201 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5202 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5204 * SystemTap probes for malloc have been introduced.
5206 * SystemTap probes for slow multiple precision fallback paths of
5207 transcendental functions have been introduced.
5209 * Support for powerpc64le has been added.
5211 * The soft-float powerpc port now supports e500 processors.
5213 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5215 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5216 set of header declarations that are enabled by default, even when other
5217 feature test macros or compiler options such as -std=c99 would otherwise
5218 disable some of those declarations.
5220 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5221 conflict with POSIX. The libbsd-compat library (which was a dummy library
5222 that did nothing) has also been removed.
5224 * Preliminary documentation about Multi-Thread, Async-Signal and
5225 Async-Cancel Safety has been added.
5227 * Change of ABI data structures for s390 and s390x:
5228 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5229 allow for future hardware extensions. All library functions that accept or
5230 return these structures were versioned in order to provide backwards
5231 compatibility with existing code. However, not all cases can be handled
5232 with interface versioning. If an application embeds either structure into
5233 another structure and that structure is passed to another compilation unit
5234 which expects the newer larger-sized object then any access to the new
5235 fields will result in undefined behaviour. Similarly any access to fields
5236 that were moved by the enlarging of the structures will cause undefined
5237 behaviour. To fix the undefined behaviour all objects that are part of the
5238 final in-memory image must agree on the size of structures, and this may
5239 require recompilation.
5243 * The following bugs are resolved with this release:
5245 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5246 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5247 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5248 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5249 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5250 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5251 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5252 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5253 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5254 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5255 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5256 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5257 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5260 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5261 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5262 Distributions can re-enable building and using pt_chown via the new configure
5263 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5264 considerable security risks and should only be used if the distribution
5265 understands and accepts the risks.
5267 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5270 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5271 fixed (Bugzilla #15330).
5273 * Add support for calling C++11 thread_local object destructors on thread
5274 and program exit. This needs compiler support for offloading C++11
5275 destructor calls to glibc.
5277 * Improved worst case performance of libm functions with double inputs and
5280 * Support for priority inherited mutexes in pthread condition variables on
5281 non-x86 architectures.
5283 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5285 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5287 * Optimized string functions for ARM. Implemented by Will Newton and
5290 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5292 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5295 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5296 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5298 * Added a benchmark framework to track performance of functions in glibc.
5300 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5301 It is based on draft TS 18661 and currently enabled as a GNU extension.
5303 * On Linux, the clock function now uses the clock_gettime system call
5304 for improved precision, rather than old times system call.
5306 * Added support for version-3 tz format files. This is needed when using
5307 the tz database release 2013e or later, and affects a few unusual cases --
5308 currently only TZ='America/Godthab' for time stamps after 2037.
5310 * Added new API functions pthread_getattr_default_np and
5311 pthread_setattr_default_np to get and set the default pthread
5312 attributes of a process.
5314 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5315 This may improve lock scaling of existing programs on TSX capable systems.
5316 When the --enable-lock-elision=yes parameter is specified at configure
5317 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5320 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5321 availability). Implemented by Ryan S. Arnold.
5323 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5327 * The following bugs are resolved with this release:
5329 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5330 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5331 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5332 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5333 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5334 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5335 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5336 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5337 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5338 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5339 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5340 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5341 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5342 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5343 14879, 14889, 14893, 14898, 14914.
5345 * Optimization of memcpy for MIPS.
5347 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5348 EMFILE has been fixed (Bugzilla #14889).
5350 * The add-on ports collection is now distributed in the "ports" subdirectory
5351 of the main GNU C Library distribution, rather than separately.
5353 * Port to ARM AArch64 contributed by Linaro.
5355 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5356 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5358 Implemented by Andreas Krebbel.
5360 * The new function secure_getenv allows secure access to the environment,
5361 returning NULL if running in a SUID/SGID process. This function replaces
5362 the internal function __secure_getenv.
5364 * SystemTap static probes have been added into the dynamic linker.
5365 Implemented by Gary Benson.
5367 * Optimizations of string functions strstr, strcasestr and memmem.
5368 Implemented by Maxim Kuvyrkov.
5370 * The minimum Linux kernel version that this version of the GNU C Library
5371 can be used with is 2.6.16.
5373 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5374 powerpc POWER7. Implemented by Will Schmidt.
5376 * New configure option --disable-nscd builds the C library such that it
5377 never attempts to contact the Name Service Caching Daemon (nscd).
5378 New configure option --disable-build-nscd avoids building nscd itself;
5379 this is the default if --disable-nscd is used.
5381 * Improved support for cross-compilation, including cross-testing and
5382 bootstrap builds without a previously built glibc.
5384 * Several testsuite tests are now able to test multiple IFUNC variants of an
5385 interface, rather than just testing the one that would be chooen by
5388 * New configure options --with-bugurl and --with-pkgversion, for
5389 distributors to use to embed their bug-reporting and package version
5390 information in --help and --version output.
5392 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5393 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5394 allows creation of chroots without the procfs mounted on /proc.
5396 * The `crypt' function now fails if passed salt bytes that violate the
5397 specification for those values. On Linux, the `crypt' function will
5398 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5399 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5400 when the mode is enabled.
5402 * The `clock_*' suite of functions (declared in <time.h>) is now available
5403 directly in the main C library. Previously it was necessary to link with
5404 -lrt to use these functions. This change has the effect that a
5405 single-threaded program that uses a function such as `clock_gettime' (and
5406 is not linked with -lrt) will no longer implicitly load the pthreads
5407 library at runtime and so will not suffer the overheads associated with
5408 multi-thread support in other code such as the C++ runtime library.
5410 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5415 * The following bugs are resolved with this release:
5417 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5418 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5419 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5420 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5421 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5422 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5423 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5424 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5425 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5426 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5427 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5428 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5429 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5430 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5431 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5432 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5433 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5434 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5435 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5436 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5437 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5438 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5441 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5442 configuring glibc with:
5443 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5444 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5445 Implemented by H.J. Lu.
5449 + define static_assert
5451 + do not declare gets
5453 + declare at_quick_exit and quick_exit also for ISO C11
5455 + aligned_alloc. NB: The code is deliberately allows the size parameter
5456 to not be a multiple of the alignment. This is a moronic requirement
5457 in the standard but it is only a requirement on the caller, not the
5460 + timespec_get added
5462 + uchar.h support added
5464 + CMPLX, CMPLXF, CMPLXL added
5466 Implemented by Ulrich Drepper.
5468 * Support for the IA-64 has been moved to ports.
5470 * Remove support for anything but ELF binary format
5472 * Checking versions of poll, ppoll added.
5473 Implemented by Ulrich Drepper.
5475 * More generic and 64-bit performance optimizations to math functions.
5476 Implemented by Ulrich Drepper.
5478 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5479 headers and functions available at compile time as they were before
5480 version 2.14. This option will be removed at some time in the future
5481 after the TI-RPC library becomes fully sufficient for the needs of
5482 existing applications.
5484 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5485 Note that glibc is not expected to work with any Linux kernel version
5488 * New header <sys/auxv.h> and function getauxval allowing easy access to
5489 the AT_* key-value pairs passed from the Linux kernel. The header also
5490 defines the HWCAP_* bits associated with the AT_HWCAP key.
5492 * New locales: mag_IN
5494 * New configure option --enable-systemtap builds SystemTap static probes
5495 into libc for setjmp and longjmp and into libpthread for various operations.
5496 So far the setjmp/longjmp probes and some of the libpthread probes are
5497 provided only for i*86 and x86_64.
5498 Implemented by Roland McGrath and Rayson Ho.
5500 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5502 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5505 * More optimized functions for SPARC. Implemented by David S. Miller.
5507 * Improved support for cross-compilation, especially bootstrap builds
5508 without a previously built glibc.
5510 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5511 Chris Metcalf from Tilera.
5513 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5514 now supported for ARM processors.
5516 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5517 as the name of the dynamic linker, to distinguish it from the
5518 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5520 * Support for CRIS has been removed from ports.
5522 * A new class of installed header has been documented for low-level
5523 platform-specific functionality. PowerPC added the first instance with a
5524 function to provide time base register access. Contributed by Tulio
5525 Magno Quites Machado Filho.
5527 * ix86 configurations now install header files that are consistent with
5528 what x86-64 configurations install. These same header files can be used
5529 for -m32, -m64, or -mx32 builds.
5530 Contributed by H.J. Lu.
5532 * Math library bug fixes. A thorough audit of all open math library bugs was
5533 conducted by Joseph Myers. Significant progress was made on many math
5534 library bugs resulting in more accurate exceptions and function results.
5535 Many thanks to all those that contributed including Andreas Jaeger for his
5536 patch review and work on the x87 trigonometric instruction issues.
5538 * Timezone data is no longer installed. Timezone-related binaries and scripts
5539 will continue to be installed. Users should obtain their timezone data from
5540 their distribution provider or from the tzdata package at
5541 <ftp://munnari.oz.au/pub/>.
5545 * The following bugs are resolved with this release:
5547 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5548 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5549 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5550 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5551 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5552 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5553 13484, 13506, 13515, 13523, 13524, 13538, 13540
5555 * New program pldd to list loaded object of a process
5556 Implemented by Ulrich Drepper.
5558 * Add nss_db support back to glibc. No more dependency on Berkeley db
5559 and support for initgroups lookups.
5560 Implemented by Ulrich Drepper.
5562 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5563 Contributed by HJ Lu.
5565 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5566 Contributed by HJ Lu.
5568 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5569 on x86-32 and x86-64.
5570 Contributed by Liubov Dmitrieva.
5572 * Optimized strchr and strrchr for SSE on x86-32.
5573 Contributed by Liubov Dmitrieva.
5575 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5576 for x86-64 and x86-32.
5577 Contributed by Liubov Dmitrieva.
5579 * New interfaces: scandirat, scandirat64
5580 Implemented by Ulrich Drepper.
5582 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5583 Implemented by Ulrich Drepper.
5585 * nscd now also caches the netgroup database.
5586 Implemented by Ulrich Drepper.
5588 * Integrate libm with gcc's -ffinite-math-only option.
5589 Implemented by Ulrich Drepper.
5591 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5592 to math functions. Implemented by Ulrich Drepper.
5594 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5595 Implemented by Ulrich Drepper.
5597 * New Linux interfaces: process_vm_readv, process_vm_writev
5599 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5600 Implemented by Ulrich Drepper.
5602 * Optimized nearbyint and strcasecmp for PPC.
5603 Implemented by Adhemerval Zanella.
5605 * New locales: bho_IN, unm_US, es_CU, ta_LK
5609 * The following bugs are resolved with this release:
5611 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5612 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5613 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5614 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5615 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5616 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5617 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5618 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5619 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5620 12795, 12811, 12813, 12814, 12841
5622 * The RPC implementation in libc is obsoleted. Old programs keep working
5623 but new programs cannot be linked with the routines in libc anymore.
5624 Programs in need of RPC functionality must be linked against TI-RPC.
5625 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5627 Visible changes of this change include (obviously) the inability to link
5628 programs using RPC functions without referencing the TI-RPC library and the
5629 removal of the RPC headers from the glibc headers.
5630 Implemented by Ulrich Drepper.
5632 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5633 syncfs, setns, sendmmsg
5635 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5636 yue_HK, lij_IT, mhr_RU
5638 * New encodings: CP770, CP771, CP772, CP773, CP774
5640 * New program sotruss to trace calls through PLTs
5641 Implemented by Ulrich Drepper.
5643 * The malloc hook implementation is marked deprecated and will be removed
5644 from the default implementation in the next version. The design never
5645 worked ever since the introduction of threads. Even programs which do
5646 not create threads themselves can use multiple threads created internally.
5650 * The following bugs are resolved with this release:
5652 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5653 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5654 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5655 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5658 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5660 * POWER7 optimizations: memset, memcmp, strncmp
5662 * New optimized string functions for x86-64: strnlen (SSE2),
5663 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5664 Implemented by Ulrich Drepper.
5668 * The following bugs are resolved with this release:
5670 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5671 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5672 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5673 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5674 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5675 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5676 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5677 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5679 * New interfaces: pthread_getname_np, pthread_setname_np
5681 * New Linux interface: recvmmsg
5683 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5685 * The dynamic linker now recognizes supported ABI versions from the
5686 EI_ABIVERSION field in the ELF header.
5687 Implemented by Ulrich Drepper.
5689 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5690 will not be used to fill in password fields in the passwd.byname replies.
5691 Instead it is used to synthesize the shadow.byname table, should it be
5692 missing. This is a useful mode in some installations involving Solaris.
5693 Implemented by Ulrich Drepper.
5695 * New locales: kok_IN, sq_MK, cv_RU
5699 * The following bugs are resolved with this release:
5701 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5702 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5703 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5704 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5705 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5706 10789, 10817, 10823, 10840, 10847
5708 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5710 Implemented by Ulrich Drepper.
5712 * Checking version of longjmp added that fails if an uninitialized stack
5713 frame would be created. Implemented by Ulrich Drepper.
5715 * STT_GNU_IFUNC is now supported in static executables.
5716 Implemented by H.J. Lu.
5718 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5720 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5721 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5722 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5723 Contributed by H.J. Lu.
5725 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5726 Implemented by Ulrich Drepper.
5728 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5730 Contributed by H.J. Lu.
5732 * Support for fma instruction in AVX on x86-64.
5733 Implemented by H.J. Lu and Ulrich Drepper.
5735 * AVX support in x86-64 auditing support in ld.so.
5736 Implemented by H.J. Lu.
5738 * STB_GNU_UNIQUE support added.
5739 Implemented by Ulrich Drepper.
5741 * Implement second fallback mode for optimized DNS lookup for even more
5742 broken environments. If two requests from the same port are not
5743 handled correctly close the socket and open a new one before sending
5744 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5745 can be used to select this mode right away, instead of rediscovering the
5746 necessity is every process again.
5747 Implemented by Ulrich Drepper.
5749 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5750 Implemented by Adam Tkac.
5752 * Optimized iconv conversions for S390x.
5753 Implemented by Andreas Krebbel.
5755 * Using condvars with PI mutexes is now more efficient due to kernel
5756 support for requeueing to PI futexes. NPTL support added for x86-64.
5757 Implemented by Ulrich Drepper.
5759 * New locales: ps_AF, my_MM
5763 * The following bugs are resolved with this release:
5765 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5766 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5767 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5768 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5769 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5771 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5772 Implemented by Ulrich Drepper.
5774 * New Linux interfaces: accept4, fallocate, fallocate64.
5775 Implemented by Ulrich Drepper.
5777 * Correct declarations of string function when used in C++ code. This
5778 could lead to compile errors for invalid C++ code.
5780 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5783 * New POSIX 2008 interface: psiginfo
5784 Implemented by Ulrich Drepper.
5786 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5787 Implemented by Ulrich Drepper.
5789 * Support for selecting between multiple function definitions at runtime
5790 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5792 * The libcrypt library can now use the hash function implementations in
5793 NSS. Implemented by Ulrich Drepper.
5795 * The malloc implementation can be compiled to be less memory efficient
5796 but higher performing in multi-threaded programs.
5797 Implemented by Ulrich Drepper.
5799 * New locales: nan_TW@latin, ks_IN
5801 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5802 Implemented by Ulrich Drepper.
5804 * Extended printf hook support. It is possible to use user-defined types
5805 and extend existing format specifiers.
5806 Implemented by Ulrich Drepper.
5808 * Handling for group shadow files has been added.
5809 Implemented by Ulrich Drepper.
5811 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5812 servers (the case, e.g., for some people using the built-in DNS
5813 server in ADSL modems/routers). There is a once-per-process timeout
5814 in case of a broken server. To avoid it, users can run nscd or put
5815 'options single-request' in /etc/resolv.conf.
5816 Implemented by Ulrich Drepper.
5820 * The following bugs are resolved with this release:
5822 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5823 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5824 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5825 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5826 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5828 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5829 up at the same time. Implemented by Ulrich Drepper.
5831 * TLS descriptors for LD and GD on x86 and x86-64.
5832 Implemented by Alexandre Oliva.
5834 * getaddrinfo now handles DCCP and UDPlite.
5835 Implemented by Ulrich Drepper.
5837 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5838 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5839 Implemented by Ulrich Drepper.
5841 * New implementation of memmem, strstr, and strcasestr which is O(n).
5842 Implemented by Eric Blake.
5844 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5846 * Implement "e" option for popen to open file descriptor with the
5847 close-on-exec flag set. Implemented by Ulrich Drepper.
5849 * Implement "b" mode for fmemopen. In this mode writes writes don't
5850 implicitly add a NUL byte and seeks from the end of the buffer really
5851 use the buffer end, not the string length as the basis.
5852 Implemented by Ulrich Drepper.
5854 * Many functions, exported and internal, now atomically set the close-on-exec
5855 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5857 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5859 Implemented by Pravin Satpute.
5861 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5865 * The following bugs are resolved with this release:
5867 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5868 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5869 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5870 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5871 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5872 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5873 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5875 * New locales: bo_CN, bo_IN, shs_CA.
5877 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5879 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5880 Implemented by Pravin Satpute.
5882 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5884 * nscd caches now all timeouts for DNS entries
5885 Implemented by Ulrich Drepper.
5887 * nscd is more efficient and wakes up less often.
5888 Implemented by Ulrich Drepper.
5890 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5891 vdprintf, and obstack_vprintf.
5892 Implemented by Jakub Jelinek.
5894 * Faster memset for x86-64.
5895 Implemented by Harsha Jagasia and H.J. Lu.
5897 * Faster memcpy on x86.
5898 Implemented by Ulrich Drepper.
5900 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5901 Implemented by Ulrich Drepper.
5903 * Faster sqrt and sqrtf implementation for some PPC variants.
5904 Implemented by Steven Munroe.
5908 * The following bugs are resolved with this release:
5910 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5911 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5912 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5913 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5914 5071, 5103, 5104, 5112, 5113, 5184, 5186
5916 * More checking functions: fread, fread_unlocked, open*, mq_open.
5917 Implemented by Jakub Jelinek and Ulrich Drepper.
5919 * Extend fortification to C++. Implemented by Jakub Jelinek.
5921 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5922 by not recognizing 'a' as a modifier when those specs are requested.
5923 Implemented by Jakub Jelinek.
5925 * PPC optimizations to math and string functions.
5926 Implemented by Steven Munroe.
5928 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5929 options to be passed. Implemented by Ulrich Drepper.
5931 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5933 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5934 Implemented by Ulrich Drepper.
5936 * Handle private futexes in the NPTL implementation.
5937 Implemented by Jakub Jelinek and Ulrich Drepper.
5939 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5940 Implemented by Roland McGrath and Ulrich Drepper.
5942 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5944 * SHA-256 and SHA-512 based password encryption.
5945 Implemented by Ulrich Drepper.
5947 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5948 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5951 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5952 Implemented by Ulrich Drepper.
5956 * The following bugs are resolved with this release:
5958 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5959 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5960 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5961 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5962 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5963 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5964 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5967 * New Linux interfaces: epoll_pwait, sched_getcpu.
5969 * New generic interfaces: strerror_l.
5971 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5975 * The following bugs are resolved with this release:
5977 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5978 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5979 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5980 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5981 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5982 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5983 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5984 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5985 3225, 3251, 3252, 3253, 3273
5987 * For Linux, the sorting of addresses returned by getaddrinfo now also
5988 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5989 Implemented by Ulrich Drepper.
5991 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5992 Implemented by Ulrich Drepper.
5994 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5996 * New iconv module for MIK. Contributed by Alexander Shopov.
5998 * For sites with broken group and/or passwd database, the auto-propagate
5999 option of nscd can prevent creating ID lookup entries from the results
6000 of a name lookup and vice versa. This usually is no problem but some
6001 site might have problems with the default behavior.
6002 Implemented by Ulrich Drepper.
6004 * Iterating over entire database in NIS can be slow. With the
6005 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6006 to trade time for memory. The entire database will be read at once.
6007 Implemented by Ulrich Drepper.
6009 * The interfaces introduced in RFC 3542 have been implemented by
6012 * Support for the new ELF hash table format was added by Ulrich Drepper.
6014 * Support for priority inheritance mutexes added by Jakub Jelinek and
6017 * Support for priority protected mutexes added by Jakub Jelinek.
6019 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6020 or_IN, csb_PL, fy_NL, sr_ME.
6024 * More overflow detection functions.
6026 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6027 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6029 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6030 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6031 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6032 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6033 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6034 by Masahide Washizawa.
6036 * It is now possible to install audit libraries for the dynamic linker using
6037 LD_AUDIT. Implemented by Ulrich Drepper.
6039 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6040 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6041 For a libc and libpthread that works well on Linux 2.4 kernels, we
6042 recommend using the stable 2.3 branch.
6044 * The new function open_wmemstream acts like open_memstream,
6045 but uses a wchar_t wide character buffer.
6047 * The new function ppoll is an improved version of poll, similar to pselect.
6049 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6050 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6051 renameat, unlinkat, linkat, symlinkat, readlinkat.
6053 * New Linux kernel system calls: unshare,
6054 inotify_init, inotify_add_watch, inotify_rm_watch.
6056 * The euidaccess function is now also known by the alias eaccess,
6057 for compatibility with some other systems.
6059 * Timezone data updated to 2006b version.
6063 * The following bugs are resolved with this release:
6065 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6066 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6067 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6068 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6069 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6070 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6072 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6074 * As of this release, GCC 4 can be used to compile the C Library.
6076 * Timezone data updated to 2005m version.
6080 * The following bugs are resolved with this release:
6082 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6083 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6084 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6085 777, 787, 821, 822, 823, 825
6087 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6091 * Support for RFC 3678. Real implementations exist only for Linux so far.
6092 Implemented by Ulrich Drepper.
6094 * nscd can now cache entries persistently. Expiring entries are reloaded.
6095 For speedups the cache can be shared in memory with client processes.
6096 Implemented by Ulrich Drepper.
6098 * nscd can now perform SELinux checks.
6099 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6101 * getaddrinfo queries are now cached. Canonical name lookup is performed
6103 Implemented by Ulrich Drepper.
6105 * The nothrow function attribute is used when headers are used by gcc when
6106 compiling C code. This can avoid significant amounts of exception
6109 * The malloc functions perform more error checking and are stricter when
6110 it comes to reacting on errors. The default action is to terminate
6111 the process after showing an error message. Implemented by Ulrich Drepper.
6113 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6114 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6116 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6117 namespaces using the new function dlmopen(). This feature is of course,
6118 like most other dynamic loading functionality, not available in statically
6119 linked applications. Implemented by Ulrich Drepper.
6121 * Low-overhead boundary checking variants of string and some stdio functions
6122 were added. These are to be used in conjunction with a gcc patch by
6123 Jakub Jelinek which adds calls to these functions if possible.
6124 Implemented by Jakub Jelinek and Ulrich Drepper.
6126 * Old code for several operating systems and machine architectures that
6127 have not been in working condition in a long time have been removed from
6128 the main source tree maintained by the GNU C Library's maintainers.
6129 These files are now reside in the separate `ports' source module
6130 that is usable as an add-on when building the library.
6134 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6135 interrogate the dynamic linker, compatible with the Solaris interface.
6137 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6138 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6140 * getifaddrs now uses the netlink interface on Linux to get its information.
6141 Implemented by Thorsten Kukuk.
6143 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6144 Implemented by Ulrich Drepper.
6146 * support for non-executable stacks on x86 has been added. Changes mostly
6149 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6152 * getaddrinfo now performs destination address selection according to
6157 * Thread-safe interfaces for many functions that access locale data
6158 were added in version 2.3, but these features were omitted from NEWS.
6159 Many functions have variants with an `_l' suffix that take a `locale_t'
6160 object as a parameter rather than consulting the current locale.
6161 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6162 create and maintain `locale_t' objects. Additionally, the new function
6163 `uselocale' sets "the current locale" (as used by functions not so
6164 parameterized) set for an individual thread. These features were added
6165 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6167 * The functions getresuid, getresgid, setresuid, and setresgid, which
6168 have long been available on Linux, are now declared in <unistd.h>
6169 and are now also available on the Hurd.
6171 * ELF thread-local storage support (TLS) now works on x86-64.
6173 * The new dynamic string token $LIB is expanded in shared library names.
6174 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6176 * Aldy Hernandez contributed complete software floating point support for
6177 PowerPC machines with no FPU.
6179 * fexecve is implemented on Linux.
6181 * The `btowc' function should work at least twice as fast due to
6182 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6184 * With appropriate thread add-ons cancelable functions are now implemented
6185 in libc.so as well. No need to call the function in libpthread. This
6186 change allowed to finally disable the incorrect and expensive handling
6187 of weak definition in ld.so.
6189 * Yet more PLT entries in libc.so have been removed. We finally arrived
6190 at the bare minimum. Startup times improved appropriately.
6192 * Support for the new Linux/x86 system call interface was added. The
6193 AT_SYSINFO auxiliary vector entry is recognized and handled.
6197 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6200 * iconv (the program and the interface) now accepts empty names (excluding
6201 options like //TRANSLIT) to mean "use charset of current locale".
6203 * localedef can now transliterate characters in strings which are not in
6204 the provided charmap. The information from the input locale is used.
6206 * Prelinking support was added for ELF targets. This requires additional
6207 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6209 * Read-only stdio streams now use mmap to speed up operation by eliminating
6210 copying and buffer underflows. To use add 'm' to the mode string of
6211 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6213 * The malloc functions were completely rewritten by Wolfram Gloger based
6214 on Doug Lea's malloc-2.7.0.c.
6216 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6217 implementation of regex.
6219 * Bruno Haible upgraded the iconv and locale implementation to support
6222 * Contents of the LC_* and LANG environment variables in the CEN style are
6223 not recognized anymore. It never was used. Change by Ulrich Drepper.
6225 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6226 thread-local storage (TLS) ABI on some platforms.
6227 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6229 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6230 EUC-JISX0213, and TSCII.
6232 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6233 BSD-compatible interface for getting all network interface addresses.
6234 Implementation for IPv4 by Roland McGrath.
6236 * Loading of locale data is faster due to the introduction of a locale
6237 archive. Implemented by Roland McGrath and Ulrich Drepper.
6239 * Startup times are significantly reduced by not using exported functions
6240 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6243 * Steven Munroe contributed a port to PowerPC64/Linux.
6247 * The Hurd now uses the GNU libio implementation of stdio rather than the
6248 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6250 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6251 with the same behavior as the Linux system call of the same name.
6255 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6256 128-bit long double format.
6258 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6259 IBM1161, and IBM1162 charsets.
6261 * Andreas Jaeger contributed a port to x86-64/Linux.
6263 * Peter Bruin contributed a port to PowerPC/Hurd.
6265 * libc functions using I/O streams now can handle wide-oriented streams
6268 * optimizations in the dynamic linker. Binaries created by recent binutils
6269 versions start up quicker due to reduced time spent on relocations.
6271 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6275 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6276 asinh, atanh, j0 for the 128-bit long double format.
6278 * Bruno Haible updated all the code handling Unicode in some form to
6279 support Unicode 3.1.
6281 * Speed of regex for single-byte locales is back to previous levels.
6282 Patch by Isamu Hasegawa.
6284 * Alpha, SPARC, and IA-64 now also using floating stacks.
6286 * Startup time of internationalized applications greatly improved through
6287 iconv cache. Use iconvconfig to generate the cache file.
6288 Contributed by Ulrich Drepper.
6290 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6291 severe performance problems. Patch by David Mosberger.
6293 * The Hurd port got a lot more functionality like AIO, various stdio
6294 extensions, etc. Mainly done by Roland McGrath.
6296 * mtrace can now lookup symbols in shared libraries.
6300 * Intel's IA-64 math library is largely integrated. It provides fast and
6301 accurate implementatations for most basic and standard math functions
6302 in float, double, and long double format.
6304 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6305 and asin for the 96-bit long double format and asin, log, tan for the
6306 128-bit long double format.
6308 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6309 The basic double functions exist today. Contributed by Abraham Ziv
6310 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6311 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6313 * An asynchronous name lookup library was added. The interface is designed
6314 after POSIX AIO. The proposal was circulated beforehand to get comments.
6315 No negative ones came in. Implemented by Ulrich Drepper.
6317 * Port to S390/64bit contributed by Martin Schwidefsky
6318 <schwidefsky@de.ibm.com>.
6320 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6321 of functions for Linux/IA-64.
6323 * The RPC code is now thread safe. Threads can now use the same service
6324 of different services at the same time. Patch by Eric Norum
6325 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6327 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6328 family of functions for Linux/S390.
6330 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6331 of functions for Linux/x86.
6333 * Port to Linux/CRIS contributed by Axis Communications.
6337 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6338 we can now check for namespace violations and missing declarations. The
6339 result is that almost all headers are now Unix-compliant (as defined in
6340 the upcoming XPG6). The negative side is that some programs might need
6341 corrections, too, if they depend on the incorrect form of the headers in
6342 previous versions which defined too many symbols and included too many
6345 * regex now handles multibyte character sets correctly.
6346 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6348 * iconv (the program) does now conform to the upcoming XPG6 and handles
6349 charmaps. Instead of the charset names the path of charmaps can be
6350 provided and the conversion happens based on this data.
6351 Contributed by Ulrich Drepper.
6353 * The locale program now provides detailed information about the installed
6358 only lists the names of the supported locales
6362 provides details such as country, language, and codeset name.
6363 Contributed by Ulrich Drepper.
6367 * The gencat program now parses the input file according to the charset
6368 selected by the LC_CTYPE category. This is important for stateful
6369 character sets. To make generating catalogs easier there is a way
6370 to overwrite the charset selected by the locale: before the first
6371 message or $ quote line the catalog can contain a line like
6373 $ codeset=ISO-8859-2
6375 to select the charset (ISO-8859-2 in this case).
6377 Implemented by Shinya Hanataka and Ulrich Drepper.
6379 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6380 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6381 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6383 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6384 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6386 * The LANGUAGE environment variable is now ignored unless the locale is
6387 changed from the default "C" locale.
6389 * The usual bug fixes.
6393 * Greg McGary added runtime support for bounds checking using gcc's
6394 new -fbounded-pointers option. ix86 target is complete. PowerPC
6397 * Thorsten Kukuk added secure mode support to nscd.
6399 * The Berkeley db libraries have been removed.
6401 Related, the nss_db module is now in a separate package since it
6402 obviously requires a database library being available.
6404 * Wide character I/O streams implemented by Ulrich Drepper.
6406 * Functions from the extended socket API added by Ulrich Drepper.
6408 * Functions feenableexcept and fedisableexcept to control the
6409 behaviour of individual exceptions have been added by Andreas Jaeger.
6411 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6413 * The resolver code has been updated from bind 8.2.3-T5B which supports
6414 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6417 This change could in some situations effect backward compatibility. Since
6418 now `_res' is a thread-local instead of a global variable, modifying it
6419 in one thread does not have any effect in other threads.
6421 The resolver library was also extended to allow IPv6 as the transport
6422 protocol for the requests. This work was done by Stig Venaas.
6424 * Compatibility code for K&R C compilers has been removed from the
6425 header files. A ISO C compiler is needed to use the library
6426 (conforming to either C89 or C99 standard).
6428 * Complete rewrite of the localedef program to support multibyte character
6429 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6430 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6431 Implemented by Ulrich Drepper.
6433 Bruno Haible significantly improved the generation and use of the data
6434 structures for the wide character tables.
6436 * Plural handling in gettext implemented by Ulrich Drepper.
6438 * The utmp daemon has been removed.
6440 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6442 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6445 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6447 * POSIX barriers implemented by Kaz Kylheku.
6449 * POSIX spawn function family implemented by Ulrich Drepper.
6451 * POSIX spinlocks are now available.
6453 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6455 * the configure option --enable-kernel=X.Y.Z allows to strip out
6456 compatibility for kernel versions before X.Y.Z. This is currently only
6457 implemented for Linux.
6459 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6460 field sin6_scope_id. This means that all programs using IPv6 should be
6461 recompiled. Don't expect binary compatibility with previous glibc
6464 * various conversion modules for IBM character sets contributed by
6467 * IA-64 port by Jes Sorensen and HJ Lu.
6481 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6483 * New xdr functions are added; some rpc functions are now 64bit clean.
6485 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6487 * Fixed known incompatibilities with glibc 2.0.
6489 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6491 * Optimized a number of functions (especially the ELF dynamic loader).
6493 * Update timezone data files.
6495 * lots of charmaps corrections
6497 * some new locale definitions and charmaps
6502 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6503 conform to POSIX member type requirements. Symbol versions have been
6504 adjusted as needed within the library, and for direct use by applications,
6505 but there is potential for problems if third-party libraries use
6506 struct timeval as part of their interface. This does not present
6507 a problem for X and other "essential" system libraries.
6509 * An additional locale model to support C++ Standard Library locale
6510 model and probably more was implemented by Ulrich Drepper.
6512 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6515 * Miles Bader provided the `argp' function family to support hierarchical
6516 command line argument parsing, layered on top of getopt.
6518 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6520 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6523 * scanf recognizes the %a and %A format for scanning floating point numbers.
6525 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6526 information and interfaces for the available integer types.
6528 * about 130 new math functions were added to implement the ISO C9x math
6531 * the new header <complex.h> contains definitions of the complex math
6532 functions from ISO C 9X.
6534 * the new header <tgmath.h> defines generic macros to use complex or
6535 real valued functions.
6537 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6539 * Andreas Jaeger provided a test suite for the math library.
6541 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6543 * Ulrich Drepper added character set conversion functions (iconv).
6545 * Optimized string functions have been added.
6547 * The localedata addon is now part of glibc.
6549 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6551 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6552 daemon for NSS (nscd).
6554 Missing a better place here are some numbers on improvements. Under
6555 Linux 2.1.125 un-tar-ing the kernel sources takes
6559 using local files 12.19s 6.88s 22.91s
6561 using NIS 13.92s 8.91s 26.34s
6563 using NIS & nscd 10.37s 7.34s 25.30s
6565 using NIS+ 27.57s 30.37s 640.46s
6567 using NIS+ & nscd 10.25s 7.83s 26.51s
6569 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6571 Keep in mind that non-namelookup related operations dominate above times.
6572 It was just a common complain that using NIS+ unpacking the kernel is
6575 [1] The old nscd implementation is not available anymore since it was
6576 distributed with glibc up to version 2.0.98 and thus is now replaced.
6578 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6580 * Mark Kettenis provided a Hesiod NSS module.
6582 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6583 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6585 * rcmd can now handle netgroups (Dick Streefland).
6587 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6590 * Support for the IPv6 protocol has been added to the socket API, as per the
6591 latest draft standards.
6593 * Support for Linux 2.2 has been added.
6595 * Interface changes relative to the latest 2.0.x release:
6596 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6597 addseverity NEW: Unix98
6598 alphasort64 NEW: LFS
6599 argp_err_exit_status NEW: argp, GNU ext
6600 argp_error NEW: argp, GNU ext
6601 argp_failure NEW: argp, GNU ext
6602 argp_help NEW: argp, GNU ext
6603 argp_parse NEW: argp, GNU ext
6604 argp_program_bug_address NEW: argp, GNU ext
6605 argp_program_version NEW: argp, GNU ext
6606 argp_program_version_hook NEW: argp, GNU ext
6607 argp_state_help NEW: argp, GNU ext
6608 argp_usage NEW: argp, GNU ext
6609 authdes_create NEW: Secure RPC
6610 authdes_getucred NEW: Secure RPC
6611 authdes_pk_create NEW: Secure RPC
6612 backtrace NEW: GNU ext.
6613 backtrace_symbols NEW: GNU ext.
6614 backtrace_symbols_fd NEW: GNU ext.
6616 cacosf NEW: ISO C 9x
6617 cacosh NEW: ISO C 9x
6618 cacoshf NEW: ISO C 9x
6619 cacoshl NEW: ISO C 9x
6620 cacosl NEW: ISO C 9x
6627 casinf NEW: ISO C 9x
6628 casinh NEW: ISO C 9x
6629 casinhf NEW: ISO C 9x
6630 casinhl NEW: ISO C 9x
6631 casinl NEW: ISO C 9x
6633 catanf NEW: ISO C 9x
6634 catanh NEW: ISO C 9x
6635 catanhf NEW: ISO C 9x
6636 catanhl NEW: ISO C 9x
6637 catanl NEW: ISO C 9x
6638 cbc_crypt NEW: Secure RPC
6642 ccoshf NEW: ISO C 9x
6643 ccoshl NEW: ISO C 9x
6649 cimagf NEW: ISO C 9x
6650 cimagl NEW: ISO C 9x
6651 clearerr_locked REMOVED
6652 clntunix_create NEW: sunrpc ext
6654 clog10 NEW: ISO C 9x
6655 clog10f NEW: ISO C 9x
6656 clog10l NEW: ISO C 9x
6666 cprojf NEW: ISO C 9x
6667 cprojl NEW: ISO C 9x
6669 crealf NEW: ISO C 9x
6670 creall NEW: ISO C 9x
6675 csinhf NEW: ISO C 9x
6676 csinhl NEW: ISO C 9x
6679 csqrtf NEW: ISO C 9x
6680 csqrtl NEW: ISO C 9x
6684 ctanhf NEW: ISO C 9x
6685 ctanhl NEW: ISO C 9x
6687 des_setparity NEW: Secure RPC
6688 ecb_crypt NEW: Secure RPC
6689 endutxent NEW: Unix98
6691 exp10f NEW: ISO C 9x
6692 exp10l NEW: ISO C 9x
6696 fattach NEW: STREAMS
6697 fdetach NEW: STREAMS
6701 feclearexcept NEW: ISO C 9x
6702 fegetenv NEW: ISO C 9x
6703 fegetexceptflag NEW: ISO C 9x
6704 fegetround NEW: ISO C 9x
6705 feholdexcept NEW: ISO C 9x
6707 feraiseexcept NEW: ISO C 9x
6708 ferror_locked REMOVED
6709 fesetenv NEW: ISO C 9x
6710 fesetexceptflag NEW: ISO C 9x
6711 fesetround NEW: ISO C 9x
6712 fetestexcept NEW: ISO C 9x
6713 feupdateenv NEW: ISO C 9x
6714 fflush_locked REMOVED
6718 fgets_unlocked NEW: GNU ext.
6719 fileno_locked REMOVED
6731 fputc_locked REMOVED
6732 fputs_unlocked NEW: GNU ext.
6733 fread_unlocked NEW: GNU ext.
6738 fstatvfs NEW: Unix98
6742 ftruncate64 NEW: LFS
6744 fwrite_unlocked NEW: GNU ext.
6745 gai_strerror NEW: IPv6
6749 getchar_locked REMOVED
6751 getdate_err NEW: Unix98
6752 getdate_r NEW: GNU ext.
6754 getnameinfo NEW: IPv6
6755 getnetname NEW: Secure RPC
6756 getpmsg NEW: STREAMS
6757 getpt NEW: Unix98 PTY
6758 getrlimit64 NEW: LFS
6759 getutxent NEW: Unix98
6760 getutxid NEW: Unix98
6761 getutxline NEW: Unix98
6762 glob64 NEW: GNU ext.
6763 globfree64 NEW: GNU ext.
6764 gnu_get_libc_release NEW: GNU ext.
6765 gnu_get_libc_version NEW: GNU ext.
6766 grantpt NEW: Unix98 PTY
6767 host2netname NEW: Secure RPC
6769 iconv_close NEW: iconv
6770 iconv_open NEW: iconv
6771 if_freenameindex NEW: IPv6
6772 if_indextoname NEW: IPv6
6773 if_nameindex NEW: IPv6
6774 if_nametoindex NEW: IPv6
6775 in6addr_any NEW: IPv6
6776 in6addr_loopback NEW: IPv6
6777 inet6_isipv4mapped NEW: IPv6
6778 isastream NEW: STREAMS
6779 iswblank NEW: GNU ext.
6780 key_decryptsession NEW: Secure RPC
6781 key_decryptsession_pk NEW: Secure RPC
6782 key_encryptsession NEW: Secure RPC
6783 key_encryptsession_pk NEW: Secure RPC
6784 key_gendes NEW: Secure RPC
6785 key_get_conv NEW: Secure RPC
6786 key_secretkey_is_set NEW: Secure RPC
6787 key_setnet NEW: Secure RPC
6788 key_setsecret NEW: Secure RPC
6789 llrint NEW: ISO C 9x
6790 llrintf NEW: ISO C 9x
6791 llrintl NEW: ISO C 9x
6792 llround NEW: ISO C 9x
6793 llroundf NEW: ISO C 9x
6794 llroundl NEW: ISO C 9x
6799 lrintf NEW: ISO C 9x
6800 lrintl NEW: ISO C 9x
6801 lround NEW: ISO C 9x
6802 lroundf NEW: ISO C 9x
6803 lroundl NEW: ISO C 9x
6805 makecontext NEW: Unix98
6806 mempcpy NEW: GNU ext.
6809 modify_ldt NEW: kernel
6813 nearbyint NEW: ISO C 9x
6814 nearbyintf NEW: ISO C 9x
6815 nearbyintl NEW: ISO C 9x
6816 netname2host NEW: Secure RPC
6817 netname2user NEW: Secure RPC
6818 nexttoward NEW: ISO C 9x
6819 nexttowardf NEW: ISO C 9x
6820 nexttowardl NEW: ISO C 9x
6824 passwd2des NEW: Secure RPC
6826 pow10f NEW: GNU ext.
6827 pow10l NEW: GNU ext.
6830 printf_size NEW: GNU ext.
6831 printf_size_info NEW: GNU ext.
6832 profil_counter REMOVED
6833 pthread_mutexattr_getkind_np REPLACED
6834 pthread_mutexattr_setkind_np REPLACED
6835 ptsname NEW: Unix98 PTY
6836 ptsname_r NEW: Unix98 PTY
6838 putchar_locked REMOVED
6839 putgrent NEW: GNU ext.
6841 putpmsg NEW: STREAMS
6842 pututxline NEW: Unix98
6846 readdir64_r NEW: LFS
6847 remquo NEW: ISO C 9x
6848 remquof NEW: ISO C 9x
6849 remquol NEW: ISO C 9x
6851 roundf NEW: ISO C 9x
6852 roundl NEW: ISO C 9x
6854 scalbln NEW: ISO C 9x
6855 scalblnf NEW: ISO C 9x
6856 scalblnl NEW: ISO C 9x
6858 sendfile NEW: kernel
6859 setcontext NEW: Unix98
6860 setrlimit64 NEW: LFS
6861 setutxent NEW: Unix98
6863 sigignore NEW: Unix98
6864 sigqueue NEW: POSIX.1b
6865 sigrelse NEW: Unix98
6866 sigset NEW: POSIX.1b
6867 sigtimedwait NEW: POSIX.1b
6868 sigwaitinfo NEW: POSIX.1b
6869 sincos NEW: GNU ext.
6870 sincosf NEW: GNU ext.
6871 sincosl NEW: GNU ext.
6875 strcasestr NEW: GNU ext.
6876 strtoimax NEW: ISO C 9x
6877 strtoumax NEW: ISO C 9x
6878 strverscmp NEW: GNU ext.
6879 svcauthdes_stats NEW: Secure RPC
6880 svcunix_create NEW: sunrpc etx
6881 svcunixfd_create NEW: sunrpc ext
6882 swapcontext NEW: Unix98
6883 tcgetsid NEW: Unix98 PTY
6884 tdestroy NEW: GNU ext.
6885 tgamma NEW: ISO C 9x
6886 tgammaf NEW: ISO C 9x
6887 tgammal NEW: ISO C 9x
6891 truncf NEW: ISO C 9x
6892 truncl NEW: ISO C 9x
6894 unlockpt NEW: Unix98 PTY
6895 updwtmpx NEW: Unix98
6896 user2netname NEW: Secure RPC
6897 utmpxname NEW: Unix98
6898 versionsort NEW: GNU ext.
6899 versionsort64 NEW: GNU ext.
6901 wcscasecmp NEW: GNU ext.
6902 wcsncasecmp NEW: GNU ext.
6903 wcsnlen NEW: GNU ext.
6904 wcstoimax NEW: ISO C 9x
6905 wcstoll NEW: ISO C 9x
6906 wcstoull NEW: ISO C 9x
6907 wcstoumax NEW: ISO C 9x
6909 wordexp NEW: POSIX.2
6910 wordfree NEW: POSIX.2
6911 write_profiling REMOVED
6912 xdecrypt NEW: Secure RPC
6913 xdr_authdes_cred NEW: Secure RPC
6914 xdr_authdes_verf NEW: Secure RPC
6915 xdr_cryptkeyarg NEW: Secure RPC
6916 xdr_cryptkeyarg2 NEW: Secure RPC
6917 xdr_cryptkeyres NEW: Secure RPC
6918 xdr_getcredres NEW: Secure RPC
6919 xdr_key_netstarg NEW: Secure RPC
6920 xdr_key_netstres NEW: Secure RPC
6921 xdr_keybuf NEW: Secure RPC
6922 xdr_keystatus NEW: Secure RPC
6923 xdr_netnamestr NEW: Secure RPC
6924 xdr_sizeof NEW: Secure RPC
6925 xdr_unixcred NEW: sunrpc ext
6926 xencrypt NEW: Secure RPC
6927 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6938 * inet_ntoa is thread-safe
6940 * updwtmp is moved from libutil to libc
6942 * rewrite of cbrt function
6944 * update of timezone data
6958 * add atoll function
6960 * fix complex problems in Berkeley DB code
6962 * fix math functions
6966 * fixed lots of header problems (especially Linux/GNU specific)
6968 * dynamic loader preserves all registers
6970 * Roland McGrath provided support for handling of auxiliary objects in
6971 the ELF dynamic loader.
6973 * support for parallel builds is improved
6977 * GNU extensions are no longer declared by default. To enable them you
6978 must define the macro `_GNU_SOURCE' in your program or compile with
6981 * The library has changed from using GNU ld symbol aliases to using weak
6982 symbols where available. The ELF object file format supports weak
6983 symbols; GNU ld also supports weak symbols in the a.out format. (There
6984 is also now support for other GNU ld extensions in ELF. Use the
6985 `--with-elf' option to configure to indicate you have ELF, and
6986 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6987 of many files which contained only symbol aliases, reducing the size of
6988 the source and the compiled library; many other files were renamed to
6989 less cryptic names previously occupied by the symbol alias files.
6990 There is a new header file <elf.h> for programs which operate on
6991 files in the ELF format.
6993 * Converted to Autoconf version 2, so `configure' has more options.
6994 Run `configure --help' to see the details.
6996 * The library can now be configured to build profiling, highly-optimized
6997 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6998 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6999 `configure' enable building these extra libraries. The shared library is
7000 built by default when using both ELF and GNU ld. When shared libraries
7001 are enabled, the new library `-ldl' is available for arbitrary run-time
7002 loading of shared objects; its interface is defined in <dlfcn.h>. The
7003 new header file <link.h> gives access to the internals of the run-time
7004 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7005 application of same name on other systems and it provides information
7006 about dynamically linked binaries.
7008 * The C library now provides the run-time support code for profiling
7009 executables compiled with `-pg'. Programs can control the profiling code
7010 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7011 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7012 the support for this file format was contributed by David Mosberger-Tang.
7014 * The math code has been replaced with a math library based on fdlibm from
7015 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7016 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7017 functions. The math functions now reside in a separate library, so
7018 programs using them will need to use `-lm' their linking commands.
7020 * John C. Bowman contributed optimized ix87 assembler inline functions.
7022 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7023 mechanism similar to that found in Solaris 2. This is now used for the
7024 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7025 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7026 file controls what services are used for each individual database. This
7027 works by loading shared libraries with names specified in `nsswitch.conf',
7028 so service modules can be changed or added at any time without even
7029 relinking any program. Currently there are the file, db, and NIS based
7030 NSS services available.
7032 * The new functions `strtoq' and `strtouq' parse integer values from
7033 strings, like `strtol' and `strtoul', but they return `long long int' and
7034 `unsigned long long int' values, respectively (64-bit quantities).
7036 * The new functions `strtof' and `strtold' parse floating-point values from
7037 strings, like `strtod', but they return `float' and `long double' values,
7038 respectively (on some machines `double' and `long double' are the same).
7040 * Ulrich Drepper has contributed new implementations of the floating-point
7041 printing and reading code used in the `printf' family of functions and
7042 `strtod', `strtof', and `strtold'. These new functions are perfectly
7043 accurate, and much faster than the old ones.
7045 * The implementation of the POSIX locale model was completely rewritten by
7046 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7047 to compile the POSIX locale definition.
7049 * The former dummy implementations of the strcoll and strxfrm function are
7050 now replaced by fully functional code contributed by Ulrich Drepper. The
7051 collation information comes from the POSIX locale definitions.
7053 * The new header <langinfo.h> defines an interface for accessing
7054 various locale-dependent data (using the locale chosen with `setlocale').
7056 * Ulrich Drepper has contributed a new suite of functions for operation on
7057 wide-character and multibyte-character strings, in <wchar.h>;
7058 and classification and case conversion of wide characters, in <wctype.h>.
7059 These new functions are conforming to the ISO C, Amendment 1 specification.
7061 * There is now a second implementation of the standard I/O library available.
7062 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7063 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7065 * You can now use positional parameter specifications in format strings
7066 for the `printf' and `scanf' families of functions. For example,
7067 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7068 ``Number 6, Mr Jones''. This is mainly useful when providing different
7069 format strings for different languages, whose grammars may dictate
7070 different orderings of the values being printed. To support this
7071 feature, the interface for `register_printf_handler' has changed; see
7072 the header file <printf.h> for details.
7074 * The `printf' and `scanf' families of functions now understand a new
7075 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7076 to group numbers as indicated by the locale; for `scanf' and friends, this
7077 says to accept as valid only a number with all the proper grouping
7078 separators in the right places. In the default "C" locale, numbers are
7079 not grouped; but locales for specific countries will define the usual
7080 conventions (i.e. separate thousands with `,' in the US locale).
7082 * The pgrp functions have been regularized, slightly incompatibly but much
7083 less confusingly. The core functions are now `getpgid' and `setpgid',
7084 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7085 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7086 provided for compatibility. There is no longer an incompatible `getpgrp'
7087 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7089 * The new header file <fts.h> and suite of functions simplify programs that
7090 operate on directory trees. This code comes from 4.4 BSD.
7092 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7093 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7094 NSS scheme used in glibc.
7096 * There is a new malloc debugging hook `__memalign_hook'.
7098 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7099 `unsigned int' in <sys/types.h>. These are for compatibility only and
7100 their use is discouraged.
7102 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7103 done differently, so that it works even without GNU ld.
7105 * New function `euidaccess' checks allowed access to a file like `access',
7106 but using the effective IDs instead of the real IDs.
7108 * The time zone data files have been updated for the latest and greatest
7109 local time conventions of the countries of the world.
7111 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7114 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7115 for formatting floating-point numbers. They are provided only for
7116 compatibility; new programs should use `sprintf' instead. There are
7117 also equivalent function for the `long double' floating-point type and
7118 all functions also exist in a reentrant form.
7120 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7121 functions for maintaining the login-record files (primarily of use to
7122 system programs such as `login'), and convenient functions for
7123 allocating and initializing a pseudo-terminal (pty) device.
7125 * Ulrich Drepper has contributed new support for System V style
7126 shared memory and IPC on systems that support it.
7128 * Ulrich Drepper has contributed several miscellaneous new functions found
7129 in System V: The `hsearch' family of functions provide an effective
7130 implementation of hash tables; `a64l' and `l64a' provide a very simple
7131 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7134 * Ulrich Drepper has contributed new reentrant counterparts for the
7135 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7137 * Ulrich Drepper has contributed new, highly-optimized versions of several
7138 string functions for the i486/Pentium family of processors.
7140 * Ulrich Drepper has updated the Linux-specific code, based largely
7141 on work done in Hongjiu Lu's version of GNU libc for Linux.
7142 The GNU library now supports Linux versions 2.0.10 and later,
7143 using the ELF object file format (i[3456]86-*-linux).
7145 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7147 * David Mosberger-Tang and Richard Henderson have ported the C library
7148 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7149 dynamic linking support for ELF/Alpha.
7151 * Richard Henderson contributed several Alpha optimized assembler function
7152 for arithmetic and string handling.
7154 * Ulrich Drepper has contributed a new set of message catalog functions to
7155 support multiple languages using the <libintl.h> interface, for use with
7156 his new package GNU gettext. Translation volunteers have contributed
7157 catalogs of the library's messages in Spanish, German, and Korean.
7159 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7160 program and the `catgets' function for reading the catalog files it
7161 creates. (The <libintl.h> interface is preferred; we include the
7162 <nl_types.h> interface using `catgets' only for source compatibility with
7163 programs already written to use it.)
7165 * New header file <values.h> gives SVID-compatible names for <limits.h>
7168 * Various new macros, declarations, and small header files for compatibility
7171 * New function `group_member' is a convenient way to check if a process has
7172 a given effective group ID.
7174 * When using GCC 2.7 and later, the socket functions are now declared in a
7175 special way so that passing an argument of type `struct sockaddr_in *',
7176 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7177 `struct sockaddr *' type, does not generate a type-clash warning.
7179 * New function `error' declared in header file <error.h> is a convenient
7180 function for printing error messages and optionally exiting; this is the
7181 canonical function used in GNU programs. The new functions `err', `warn',
7182 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7183 doing the same thing.
7185 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7186 POSIX.2 `glob' function to do ~ and {...} expansion.
7188 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7189 `clearenv' which is used in POSIX.9 is also available.
7191 * New function `getsid' returns session ID number on systems that support it.
7193 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7194 files <db.h> and <mpool.h> provide a rich set of functions for several
7195 types of simple databases stored in memory and in files, and <ndbm.h> is
7196 an old `ndbm'-compatible interface using the `db' functions. Link with
7197 `-ldb' to get these functions.
7199 * New macro `strdupa' copies a string like `strdup', but uses local stack
7200 space from `alloca' instead of dynamic heap space from `malloc'.
7202 * New function `strnlen' is like `strlen' but searches only a given maximum
7203 number of characters for the null terminator. `stpncpy', `strndup' and
7204 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7207 * New function `statfs' in header <sys/statfs.h>.
7209 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7210 provide convenient functions for operating on blocks of null-terminated
7213 * A new suite of functions in <utmp.h> handle all the details of reading
7214 and writing the utmp file.
7216 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7219 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7220 completely POSIX compliant and also implemented the extended functionality
7221 to handle alternate digit representation and alternate era date formats.
7223 * Ulrich Drepper provided an implementation of the `strptime' function
7224 defined in XPG4.2 which transforms a string into a `struct tm' value.
7226 * Paul Eggert provided the tzselect shell script as part of the timezone
7227 code. The shell script makes it easy to select the correct timezone
7230 * The implementation of the malloc family of functions is completely replaced
7231 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7232 The implementation uses the mmap function (if available) and it is
7233 optimized for the use in multi threaded programs.
7235 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7236 functions. This new functionality is usable by specifying a special
7237 salt string and it is compatible with implementation on *BSD systems.
7239 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7240 `getsubopt' to handle second level command line options, `bsd_signal'
7241 to access BSD style `signal' functionality, the obsolete `regexp' style
7244 * the `lchown' function is available on system which support this
7247 * The implementation of the shadow password handling function was contributed
7250 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7252 * POSIX.1g support was added. The <sys/select.h> header is available,
7253 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7254 implementation of `getaddrinfo'.
7258 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7260 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7261 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7263 * The new function `daemon' from 4.4 BSD is useful for server programs that
7264 want to put themselves in the background.
7266 * Joel Sherrill has contributed support for several standalone boards that
7267 run without an operating system.
7269 * `printf', `scanf' and friends now accept a `q' type modifier for long
7270 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7272 * All of the code taken from BSD (notably most of the math and networking
7273 routines) has been updated from the BSD 4.4-Lite release.
7275 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7277 * The new functions `getdomainname' and `setdomainname' fetch or change the
7278 YP/NIS domain name. These are system calls which exist on systems which
7281 * The time zone data files have been updated for the latest international
7284 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7285 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7289 * The C library now includes support for Sun RPC, from Sun's free
7290 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7291 are included. (There is still no support for YP.)
7293 * Tom Quinn has contributed a port of the C library to SGI machines running
7294 Irix 4 (mips-sgi-irix4).
7296 * The new `lockf' function is a simplified interface to the locking
7297 facilities of `fcntl', included for compatibility.
7299 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7301 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7303 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7306 * The error message printed by `assert' for a failed assertion now includes
7307 the name of the program (if using GNU ld) and the name of the calling
7308 function (with versions of GCC that support this).
7310 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7312 * The library now includes the <sys/mman.h> header file and memory
7313 management functions `mmap', `munmap', `mprotect', `msync', and
7314 `madvise', on systems that support those facilities.
7316 * The interface for `mcheck' has changed slightly: the function called to
7317 abort the program when an allocation inconsistency is detected now takes
7318 an argument that indicates the type of failure. The new function
7319 `mprobe' lets you request a consistency check for a particular block at
7320 any time (checks are normally done only when you call `free' or `realloc'
7323 * It is now possible to easily cross-compile the C library, building on one
7324 system a library to run on another machine and/or operating system. All
7325 you need to do is set the variable `HOST_CC' in `configparms' to the
7326 native compiler for programs to run on the machine you are building on (a
7327 few generator programs are used on Unix systems); set `CC' to the
7330 * The new function `fexecve' (only implemented on the GNU system) executes
7331 a program file given a file descriptor already open on the file.
7335 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7336 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7338 * You can set the variable `libprefix' in `configparms' to specify a prefix
7339 to be prepended to installed library files; this makes it easy to install
7340 the GNU C library to be linked as `-lgnuc' or whatever.
7342 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7343 copies a limited number of characters from a string, and returns the
7344 address of the last character written.
7346 * You no longer need to check for whether the installed `stddef.h' is
7347 compatible with the GNU C library. configure now checks for you.
7349 * You can now define a per-stream `fileno' function to convert the
7350 stream's cookie into an integral file descriptor.
7352 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7353 allocates zero bytes of storage, and returns a unique pointer which
7354 you can pass to `realloc' or `free'. The behavior is undefined if
7355 you dereference this pointer.
7357 * The C library now runs on Sony NEWS m68k machines running either
7358 NewsOS 3 or NewsOS 4.
7360 * The new `syscall' function is a system-dependent primitive function
7361 for invoking system calls. It has the canonical behavior on Unix
7362 systems, including unreliable return values for some calls (such as
7363 `pipe', `fork' and `getppid').
7365 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7366 to `EAGAIN', which is the preferred name. On systems whose kernels
7367 use two distinct codes, the C library now translates EWOULDBLOCK to
7368 EAGAIN in every system call function.
7372 * The GNU C Library Reference Manual is now distributed with the library.
7373 `make dvi' will produce a DVI file of the printed manual.
7374 `make info' will produce Info files that you can read on line using C-h i
7375 in Emacs or the `info' program.
7376 Please send comments on the manual to bug-glibc-manual@gnu.org.
7378 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7380 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7382 * Jason Merrill has contributed a port to the Sequent Symmetry running
7383 Dynix version 3 (i386-sequent-dynix).
7385 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7386 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7388 * New function `memory_warnings' lets you arrange to get warnings when
7389 malloc is running out of memory to allocate, like Emacs gives you.
7391 * The C library now contains the relocating allocator used in Emacs 19 for
7392 its editing buffers. This allocator (ralloc) minimizes allocation
7393 overhead and fragmentation by moving allocated regions around whenever it
7394 needs to. You always refer to a ralloc'd region with a "handle" (a
7395 pointer to a pointer--an object of type `void **').
7397 * There is a new `printf' format: `%m' gives you the string corresponding
7398 to the error code in `errno'.
7400 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7401 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7402 pass, the `a' modifier says to fill in a `char **' you pass with a
7405 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7406 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7407 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7409 * `mkstemp' is a traditional Unix function to atomically create and open a
7410 uniquely-named temporary file.
7414 * The standard location for the file that says what the local timezone is
7415 has changed again. It is now `/usr/local/etc/localtime' (or more
7416 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7418 * The distribution no longer contains any files with names longer than 14
7421 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7422 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7424 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7428 * The configuration process has changed quite a bit. The `configure'
7429 script is now used just like the configuration scripts for other GNU
7430 packages. The `sysdeps' directory hierarchy is much rearranged.
7431 The file `INSTALL' explains the new scheme in detail.
7433 * The header files no longer need to be processed into ANSI C and
7434 traditional C versions. There is just one set of files to install, and
7435 it will work with ANSI or old C compilers (including `gcc -traditional').
7437 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7438 MIPS DECStation running Ultrix 4.
7440 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7441 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7442 made itself into a shared library.
7444 * Yet further improved support for the i386, running 4.3 BSD-like systems
7445 (such as Mach 3 with the Unix single-server), or System V.
7447 * New function `strncasecmp' to do case-insensitive string comparison
7448 with limited length.
7450 * New function `strsep' is a reentrant alternative to `strtok'.
7452 * New functions `scandir' and `alphasort' for searching directories.
7454 * New function `setenv' is a better interface to `putenv'.
7456 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7457 function for traversing a directory tree.
7459 * The GNU obstack package is now also part of the C library.
7460 The new function `open_obstack_stream' creates a stdio stream that
7461 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7462 formatted output directly to an obstack.
7464 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7465 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7467 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7469 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7470 things to your strings.
7472 * There are some new test programs: test-fseek, testmb, and testrand.
7474 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7475 These ports are not finished, but are a good starting place for really
7476 supporting those systems.
7478 * `/etc/localtime' is now the standard location for the file that says what
7479 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7480 This follows the general principle that `/etc' is the place for all local
7481 configuration files.
7483 * The C library header files now use `extern "C"' when used by the C++
7484 compiler, so the C library should now work with C++ code.
7486 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7487 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7490 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7491 function which uses the `merge sort' algorithm, and is said to be
7492 significantly faster than the old GNU `qsort' function. Merge sort is
7493 now the standard `qsort' function. The new algorithm can require a lot
7494 of temporary storage; so, the old sorting function is called when the
7495 required storage is not available.
7497 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7498 provides the Unix `crypt' function, plus some other entry points.
7500 * The code and header files taken from 4.4 BSD have been updated with the
7501 latest files released from Berkeley.
7503 ----------------------------------------------------------------------
7506 Permission is granted to anyone to make or distribute verbatim copies
7507 of this document as received, in any medium, provided that the
7508 copyright notice and this permission notice are preserved,
7509 thus giving the recipient permission to redistribute in turn.
7511 Permission is granted to distribute modified versions
7512 of this document, or of portions of it,
7513 under the above conditions, provided also that they
7514 carry prominent notices stating who last changed them.
7517 version-control: never