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 * On Linux, the functions posix_spawnattr_getcgroup_np and
18 posix_spawnattr_setcgroup_np have been added, along with the
19 POSIX_SPAWN_SETCGROUP flag. They allow posix_spawn and posix_spawnp
20 to set the cgroupv2 in the new process in a race-free manner. These
21 functions are GNU extensions and require a kernel with clone3 support.
23 * On Linux, the pidfd_spawn and pidfd_spawp functions have been added.
24 They have a similar prototype and semantic as posix_spawn, but instead of
25 returning a process ID, they return a file descriptor that can be used
26 along other pidfd functions (like pidfd_send_signal, poll, or waitid).
27 The pidfd functionality avoids the issue of PID reuse with the traditional
28 posix_spawn interface.
30 * On Linux, the pidfd_getpid function has been added. It allows retrieving
31 the process ID associated with the process file descriptor created by
32 pid_spawn, fork_np, or pidfd_open.
34 * scanf-family functions now support the wN format length modifiers for
35 arguments pointing to types intN_t, int_leastN_t, uintN_t or
36 uint_leastN_t (for example, %w32d to read int32_t or int_least32_t in
37 decimal, or %w32x to read uint32_t or uint_least32_t in hexadecimal)
38 and the wfN format length modifiers for arguments pointing to types
39 int_fastN_t or uint_fastN_t, as specified in draft ISO C2X.
41 Deprecated and removed features, and other changes affecting compatibility:
43 [Add deprecations, removals and changes affecting compatibility here]
45 Changes to build and runtime requirements:
47 * Building on LoongArch requires at a minimum binutils 2.41 for vector
50 Security related changes:
52 CVE-2023-4527: If the system is configured in no-aaaa mode via
53 /etc/resolv.conf, getaddrinfo is called for the AF_UNSPEC address
54 family, and a DNS response is received over TCP that is larger than
55 2048 bytes, getaddrinfo may potentially disclose stack contents via
56 the returned address data, or crash.
58 CVE-2023-4806: When an NSS plugin only implements the
59 _gethostbyname2_r and _getcanonname_r callbacks, getaddrinfo could use
60 memory that was freed during buffer resizing, potentially causing a
61 crash or read or write to arbitrary memory.
63 CVE-2023-5156: The fix for CVE-2023-4806 introduced a memory leak when
64 an application calls getaddrinfo for AF_INET6 with AI_CANONNAME,
65 AI_ALL and AI_V4MAPPED flags set.
67 The following bugs are resolved with this release:
69 [The release manager will add the list generated by
70 scripts/list-fixed-bugs.py just before the release.]
76 * When C2X features are enabled and the base argument is 0 or 2, the
77 following functions support binary integers prefixed by 0b or 0B as
78 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
79 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
80 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
81 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
82 following functions support binary integers prefixed by 0b or 0B as
83 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
84 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
85 functions also support the %b format for binary integers, with or
86 without such a prefix and independent of standards mode.
88 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
91 * printf-family functions now support the wN format length modifiers for
92 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
93 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
94 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
95 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
96 specified in draft ISO C2X.
98 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
99 Transparent Huge Pages (THP) in stack allocation at pthread_create.
101 * Support for x86_64 running on Hurd has been added. This port requires
102 as least binutils 2.40 and GCC 13:
106 * Vector math library libmvec support has been added to AArch64. It
107 requires GCC version >= 10.1.0. It can be disabled via
108 "--disable-mathvec", however that is not a supported configuration as
109 it changes the ABI. The symbol names follow the AArch64 vector ABI,
110 they are declared in math.h and have to be called manually at this point.
112 * The strlcpy and strlcat functions have been added. They are derived
113 from OpenBSD, and are expected to be added to a future POSIX version.
115 * A new configure option, "--enable-fortify-source", can be used to build the
116 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
117 provided, or is set to the highest value supported by the compiler. If not
118 explicitly enabled, then fortify source is forcibly disabled so to keep
119 original behavior unchanged.
121 Deprecated and removed features, and other changes affecting compatibility:
123 * libcrypt is no longer built by default; one may use the "--enable-crypt"
124 option to build libcrypt. libcrypt is likely to be removed from the
125 GNU C Library in a future release, so it is recommended that
126 applications port away from it to an alternative such as libxcrypt.
128 * In the Linux kernel for the hppa/parisc architecture some of the
129 MADV_XXX constants were changed to have the same values as the other
130 architectures. New programs compiled with this glibc version and which
131 use the madvise call will require at least Linux kernel version 6.2,
132 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
133 5.4.228, 4.19.270 or 4.14.303.
135 * The "--disable-experimental-malloc" option is no longer available. The
136 per-thread cache can still be disabled per-application using tunables
137 (glibc.malloc.tcache_count set to zero).
139 * The configure option "--enable-tunables" has been removed. The tunable
140 feature is now always enabled.
142 Changes to build and runtime requirements:
144 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
147 Security related changes:
149 CVE-2023-25139: When the printf family of functions is called with a
150 format specifier that uses an <apostrophe> (enable grouping) and a
151 minimum width specifier, the resulting output could be larger than
152 reasonably expected by a caller that computed a tight bound on the
153 buffer size. The resulting larger than expected output could result
154 in a buffer overflow in the printf family of functions.
156 The following bugs are resolved with this release:
158 [178] string: Please add strlcpy and strlcat (attached)
159 [14697] nptl: Behavior of exit is nonconformant with respect to
161 [15142] stdio: Missing locking in _IO_cleanup
162 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
163 [18906] stdio: fopen: ccs value may affect open mode
164 [24466] stdio: Feature request: provide special printf formats for
166 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
167 [28519] libc: system and popen should pass "--" between /bin/sh and
169 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
170 [29591] string: wcsnlen length can overflow in page cross case.
171 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
172 [30068] stdio: incorrect printf output for integers with thousands
173 separator and width field (CVE-2023-25139)
174 [30111] time: support_descriptors_list fails after 2038 on 32 bits
176 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
177 symlink for libraries without soname
178 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
180 [30156] time: Potential ntp_gettime abi break
181 [30235] libc: Missing fallback in getlogin if loginuid is unset
182 [30258] dynamic-link: sprof cannot read and display shared object
183 profiling data correctly
184 [30263] libc: Add test coverage for abs(), labs(), and llabs().
185 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
186 [30402] libc: FAIL: elf/tst-glibcelf
187 [30425] dynamic-link: Symbol lookup during dlclose may fail
189 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
190 [30477] libc: [RISCV]: time64 does not work on riscv32
191 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
193 [30527] network: resolv_conf lock not unlocked on allocation failure
194 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
196 [30555] string: strerror can incorrectly return NULL
197 [30579] malloc: trim_threshold in realloc lead to high memory usage
198 [30662] nscd: Group and password cache use errno in place of errval
204 * The getent tool now supports the --no-addrconfig option. The output of
205 getent with --no-addrconfig may contain addresses of families not
206 configured on the current host i.e. as-if you had not passed
207 AI_ADDRCONFIG to getaddrinfo calls.
209 Deprecated and removed features, and other changes affecting compatibility:
211 * The dynamic linker no longer loads shared objects from the "tls"
212 subdirectories on the library search path or the subdirectory that
213 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
214 search mechanism, which was deprecated in version 2.33.
216 Security related changes:
218 CVE-2022-39046: When the syslog function is passed a crafted input
219 string larger than 1024 bytes, it reads uninitialized memory from the
220 heap and prints it to the target log file, potentially revealing a
221 portion of the contents of the heap.
223 The following bugs are resolved with this release:
225 [12154] network: Cannot resolve hosts which have wildcard aliases
226 [12165] libc: readdir: Do not skip entries with zero d_ino values
227 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
228 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
229 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
230 AF_INET6 address (ie docker)
231 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
233 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
234 [28937] dynamic-link: New DSO dependency sorter does not put new map
236 [29249] libc: csu/libc-tls.c:202: undefined reference to
237 `_startup_fatal_not_constant'
238 [29305] network: Inefficient buffer space usage in nss_dns for
239 gethostbyname and other functions
240 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
241 [29402] nscd: nscd: No such file or directory
242 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
244 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
245 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
247 [29463] math: math/test-float128-y1 fails on x86_64
248 [29485] build: Make hangs when the test misc/tst-pidfile returns
250 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
252 [29499] build: Check failed on misc/tst-glibcsyscalls while building
253 for RISCV64 on a unmatched hardware
254 [29501] build: Check failed on stdlib/tst-strfrom while building for
255 RISCV64 on a unmatched hardware
256 [29502] libc: alpha sys/acct.h out of date
257 [29514] build: Need to use -fPIE not -fpie
258 [29528] dynamic-link: __libc_early_init not called after dlmopen that
260 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
261 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
263 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
265 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
267 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
268 [29576] build: librtld.os: in function `_dl_start_profile':
269 (.text+0x9444): undefined reference to `strcpy'
270 [29578] libc: Definition of SUN_LEN() is wrong
271 [29583] build: iconv failures on 32bit platform due to missing large
273 [29600] dynamic-link: dlmopen hangs after loading certain libraries
274 [29604] localedata: Update locale data to Unicode 15.0.0
275 [29605] nscd: Regression in NSCD backend of getaddrinfo
276 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
278 [29611] string: Optimized AVX2 string functions unconditionally use
280 [29624] malloc: errno is not cleared when entering main
281 [29638] libc: stdlib: arc4random fallback is never used
282 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
284 [29698] build: Configuring for AArch32 on ARMv8+ disables
286 [29727] locale: __strtol_internal out-of-bounds read when parsing
288 [29730] libc: broken y2038 support in fstatat on MIPS N64
289 [29746] libc: ppoll() does not switch to __ppoll64 when
290 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
291 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
292 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
293 aux.S: No such file or directory)
294 [29864] libc: __libc_start_main() should obtain program headers
295 address (_dl_phdr) from the auxv, not the ELF header.
296 [29951] time: daylight variable not set correctly if last DST change
297 coincides with offset change
298 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
299 length in fortify mode
305 * Support for DT_RELR relative relocation format has been added to
306 glibc. This is a new ELF dynamic tag that improves the size of
307 relative relocations in shared object files and position independent
308 executables (PIE). DT_RELR generation requires linker support for
309 -z pack-relative-relocs option, which is supported for some targets
310 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
312 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
313 have been added. The pidfd functionality provides access to a process
314 while avoiding the issue of PID reuse on traditional Unix systems.
316 * On Linux, the process_madvise function has been added. It has the
317 same functionality as madvise but alters the target process identified
320 * On Linux, the process_mrelease function has been added. It allows a
321 caller to release the memory of a dying process. The release of the
322 memory is carried out in the context of the caller, using the caller's
323 CPU affinity, and priority with CPU usage accounted to the caller.
325 * The “no-aaaa” DNS stub resolver option has been added. System
326 administrators can use it to suppress AAAA queries made by the stub
327 resolver, including AAAA lookups triggered by NSS-based interfaces
328 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
329 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
330 produce IPv6 addresses, and configured IPv6 name servers are still
331 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
332 are translated to A queries. The new resolver option is intended
333 primarily for diagnostic purposes, to rule out that AAAA DNS queries
334 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
335 validation by applications.
337 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
338 and mount_setattr have been added. They are part of the new Linux kernel
339 mount APIs that allow applications to more flexibly configure and operate
340 on filesystem mounts. The new mount APIs are specifically designed to work
343 * localedef now accepts locale definition files encoded in UTF-8.
344 Previously, input bytes not within the ASCII range resulted in
345 unpredictable output.
347 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
348 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
349 Support for the char8_t typedef has been added per the ISO C2X N2653
350 proposal. The functions are declared in uchar.h in C2X mode or when the
351 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
352 The char8_t typedef is declared in uchar.h in C2X mode or when the
353 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
354 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
356 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
357 added. The functions wrap getrandom and/or /dev/urandom to return high-
358 quality randomness from the kernel.
360 * Support for LoongArch running on Linux has been added. This port requires
361 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
364 - loongarch64-linux-gnu
366 The LoongArch ABI is 64-bit little-endian.
368 Deprecated and removed features, and other changes affecting compatibility:
370 * Support for prelink will be removed in the next release; this includes
371 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
372 variables and their functionality in the dynamic loader.
374 * The Linux kernel version check has been removed along with the
375 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
376 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
377 when libc.so is issued directly.
379 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
381 The following bugs are resolved with this release:
383 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
384 return different result with versioned "foo"
385 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
387 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
388 ./exe and ld.so adjusts argv on the stack
389 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
391 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
392 consuming the second byte of certain double byte characters
393 [25812] stdio: Libio vtable protection is sometimes only partially
395 [27054] libc: pthread_atfork handlers that call pthread_atfork
397 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
399 [28128] build: declare_symbol_alias doesn't work for assembly codes
400 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
401 [28752] nss: Segfault in getpwuid when stat fails
402 [28815] libc: realpath should not copy to resolved buffer on error
403 [28828] stdio: fputwc crashes
404 [28838] libc: FAIL: elf/tst-p_align3
405 [28845] locale: ld-monetary.c should be updated to match ISO C and
407 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
409 [28852] libc: getaddrinfo leaks memory with AI_ALL
410 [28853] libc: tst-spawn6 changes current foreground process group
411 (breaks test isolation)
412 [28857] libc: FAIL: elf/tst-audit24a
413 [28860] build: --enable-kernel=5.1.0 build fails because of missing
414 __convert_scm_timestamps
415 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
416 inaccurate without /sys and /proc
417 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
419 [28880] libc: Program crashes if date beyond 2038
420 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
421 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
422 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
423 rtm variants when avoiding overflow
424 [28922] build: The .d dependency files aren't always generated
425 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
427 [28936] build: nm: No such file
428 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
429 [28953] nss: NSS lookup result can be incorrect if function lookup
431 [28970] math: benchtest: libmvec benchmark doesn't build with make
433 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
434 /sys/devices/system/cpu/possible
435 [28993] libc: closefrom() iterates until max int if no access to
437 [28996] libc: realpath fails to copy partial result to resolved buffer
439 [29027] math: [ia64] fabs fails with sNAN input
440 [29029] nptl: poll() spuriously returns EINTR during thread
441 cancellation and with cancellation disabled
442 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
443 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
444 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
445 is promoted to global scope
446 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
447 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
448 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
450 [29097] time: fchmodat does not handle 64 bit time_t for
452 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
454 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
455 [29162] string: [PATCH] string.h syntactic error:
456 include/bits/string_fortified.h:110: error: expected ',' or ';'
457 before '__fortified_attr_access'
458 [29165] libc: [Regression] broken argv adjustment
459 [29187] dynamic-link: [regression] broken argv adjustment for nios2
460 [29193] math: sincos produces a different output than sin/cos
461 [29197] string: __strncpy_power9() uses uninitialised register vs18
462 value for filling after \0
463 [29203] libc: daemon is not y2038 aware
464 [29204] libc: getusershell is not 2038 aware
465 [29207] libc: posix_fallocate fallback implementation is not y2038
467 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
468 [29209] libc: isfdtype is not y2038 aware
469 [29210] network: ruserpass is not y2038 aware
470 [29211] libc: __open_catalog is not y2038 aware
471 [29213] libc: gconv_parseconfdir is not y2038 aware
472 [29214] nptl: pthread_setcanceltype fails to set type
473 [29225] network: Mistyped define statement in socket/sys/socket.h in
475 [29274] nptl: __read_chk is not a cancellation point
476 [29279] libc: undefined reference to `mbstowcs_chk' after
477 464d189b9622932a75302290625de84931656ec0
478 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
479 correct for !__ASSUME_TIME64_SYSCALLS
480 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
481 missing on microblaze with largefile
487 * Unicode 14.0.0 Support: Character encoding, character type info, and
488 transliteration tables are all updated to Unicode 14.0.0, using
489 generator scripts contributed by Mike FABIAN (Red Hat).
491 * Bump r_version in the debugger interface to 2 and add a new field,
492 r_next, support multiple namespaces.
494 * Support for the C.UTF-8 locale has been added to glibc. The locale
495 supports full code-point sorting for all valid Unicode code points. A
496 limitation in the framework for fnmatch, regexec, and regcomp requires
497 a compromise to save space and only ASCII-based range expressions are
498 supported for now (see bug 28255). The full size of the locale is
499 only ~400KiB, with 346KiB coming from LC_CTYPE information for
500 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
501 in various downstream distributions. The locale is not built into
502 glibc, and must be installed.
504 * <math.h> functions that round their results to a narrower type, and
505 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
506 18661-3:2015 and draft ISO C2X:
508 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
509 fMxsqrtfN and fMxsqrtfNx functions.
511 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
514 * <math.h> functions for floating-point maximum and minimum,
515 corresponding to new operations in IEEE 754-2019, and corresponding
516 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
517 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
518 fminimum_mag, fminimum_mag_num and corresponding functions for float,
519 long double, _FloatN and _FloatNx.
521 * <math.h> macros for single-precision float constants are added as a
522 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
523 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
526 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
527 predefined as specified in TS 18661-1:2014.
529 * The exp10 functions in <math.h> now have a corresponding type-generic
532 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
534 * printf-family functions now support the %b format for output of
535 integers in binary, as specified in draft ISO C2X, and the %B variant
536 of that format recommended by draft ISO C2X.
538 * A new DSO sorting algorithm has been added in the dynamic linker that uses
539 topological sorting by depth-first search (DFS), solving performance issues
540 of the existing sorting algorithm when encountering particular circular
541 object dependency cases.
543 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
544 the two DSO sorting algorithms. The default setting of '2' uses the
545 new DFS-based algorithm. The setting '1' switches to the old
546 algorithm used in glibc 2.33 and earlier.
548 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
549 to be used by compilers for optimizing usage of 'memcmp' when its
550 return value is only used for its boolean status.
552 * Support for automatically registering threads with the Linux rseq
553 system call has been added. This system call is implemented starting
554 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
555 operations on per-cpu data. It allows user-space to perform updates
556 on per-cpu data without requiring heavy-weight atomic operations.
557 Automatically registering threads allows all libraries, including
558 libc, to make immediate use of the rseq support by using the
559 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
560 variables. The GNU C Library manual has details on integration of
561 Restartable Sequences.
563 * A symbolic link to the dynamic linker is now installed under
564 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
566 * All programs and the testsuite in glibc are now built as position independent
567 executables (PIE) by default on toolchains and architectures that support it.
568 Further, if the toolchain and architecture supports it, even static programs
569 are built as PIE and the resultant glibc can be used to build static PIE
570 executables. A new option --disable-default-pie has been added to disable
571 this behavior and get a non-PIE build. This option replaces
572 --enable-static-pie, which no longer has any effect on the build
575 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
576 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
577 or to use huge pages directly with mmap calls with the MAP_HUGETLB
578 flags). The former can improve performance when Transparent Huge Pages
579 is set to 'madvise' mode while the latter uses the system reserved
582 * The printf family of functions now handles the flagged %#m conversion
583 specifier, printing errno as an error constant (similar to strerrorname_np).
585 * The function _dl_find_object has been added. In-process unwinders
586 can use it to efficiently locate unwinding information for a code
589 * Support for OpenRISC running on Linux has been added. This port requires
590 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
595 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
596 64-bit file offsets (LFS default).
598 * A new configure option, --with-rtld-early-cflags, can be used to
599 specify additional compiler flags for building the early startup code
600 of the dynamic linker. On targets which have CPU compatibility
601 checks, this can help to ensure that proper diagnostics are printed if
602 the dynamic loader runs on an incompatible CPU.
604 * On Linux, the epoll_pwait2 function has been added. It is similar to
605 epoll_wait with the difference the timeout has nanoseconds resolution.
607 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
608 enabling posix_spawn and posix_spawnp to set the controlling terminal in
609 the new process in a race free manner. This function is a GNU extension.
611 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
612 applications compiling with glibc and gcc 12 and later. Level 3 leverages
613 the __builtin_dynamic_object_size function to deliver additional
614 fortification balanced against additional runtime cost (checking non-constant
617 * The audit libraries will avoid unnecessary slowdown if it is not required
618 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
620 Deprecated and removed features, and other changes affecting compatibility:
622 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
623 has been removed since the first PT_LOAD segment is no longer executable
624 due to defaulting to -z separate-code.
626 * The r_version update in the debugger interface makes the glibc binary
627 incompatible with GDB binaries built without the following commits:
629 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
630 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
632 when audit modules or dlmopen are used.
634 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
636 * The --enable-static-pie option is no longer available. The glibc build
637 configuration script now automatically detects static-pie support in the
638 toolchain and architecture and enables it if available.
640 * The catchsegv script and associated libSegFault.so shared object have
641 been removed. There are widely-deployed out-of-process alternatives for
642 catching coredumps and backtraces.
644 * Support for prelink will be removed in the next release; this includes
645 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
646 variables and their functionality in the dynamic loader.
648 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
649 functionality to obtain the program mapping address can be achieved by
650 using LD_TRACE_LOADED_OBJECTS to value of 2.
652 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
653 support prelink PIE binaries.
655 Changes to build and runtime requirements:
657 * The audit module interface version LAV_CURRENT is increased to enable
658 proper bind-now support. The loader now advertises via the la_symbind
659 flags that PLT trace is not possible. New audit modules require the
660 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
661 modules are still loaded for all targets except aarch64.
663 * The audit interface on aarch64 is extended to support both the indirect
664 result location register (x8) and NEON Q register. Old audit modules are
665 rejected by the loader. Audit modules must be rebuilt to use the newer
666 structure sizes and the latest module interface version for LAV_CURRENT.
668 Security related changes:
670 CVE-2022-23219: Passing an overlong file name to the clnt_create
671 legacy function could result in a stack-based buffer overflow when
672 using the "unix" protocol. Reported by Martin Sebor.
674 CVE-2022-23218: Passing an overlong file name to the svcunix_create
675 legacy function could result in a stack-based buffer overflow.
677 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
678 function could result in a memory leak and potential access of
679 uninitialized memory. Reported by Qualys.
681 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
682 function may result in an off-by-one buffer underflow and overflow
683 when the current working directory is longer than PATH_MAX and also
684 corresponds to the / directory through an unprivileged mount
685 namespace. Reported by Qualys.
687 The following bugs are resolved with this release:
689 [12889] nptl: Race condition in pthread_kill
690 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
691 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
692 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
694 [15333] libc: Use 64-bit stat functions in installed programs
695 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
697 [15971] dynamic-link: No interface for debugger access to libraries
699 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
700 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
701 deeply nested DSO dependencies.
702 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
703 ID whose lifetime has not ended
704 [22542] network: buffer overflow in sunrpc clnt_create
706 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
708 [25947] malloc: memory leak in muntrace
709 [26045] math: fmaxf(inf, nan) does not always work
710 [26108] math: exp10() has problems with <tgmath.h>
711 [26779] build: benign use after realloc at localealias.c:329
712 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
713 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
714 [27945] build: build-many-glibcs.py doesn't configure GCC with
715 --enable-initfini-array
716 [27991] build: x86: sysdeps/x86/configure.ac breaks when
717 libc_cv_include_x86_isa_level is loaded from cache
718 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
719 in __REDIRECT_NTH macro
720 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
721 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
723 [28126] libc: nftw aborts for paths longer than PATH_MAX
724 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
725 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
727 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
728 [28185] math: Inaccurate j0f function (again)
729 [28199] locale: iconvconfig prefix flag behaves differently in glibc
731 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
732 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
734 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
735 [28223] libc: mips: clone does not align stack
736 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
738 [28256] malloc: Conditional jump or move depends on uninitialised
739 value(s) in __GI___tunables_init
740 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
741 spawn5 fail if stray fds are open
742 [28310] libc: Do not use affinity mask for sysconf
743 (_SC_NPROCESSORS_CONF)
744 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
746 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
748 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
749 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
751 [28353] network: Race condition on __opensock
752 [28357] dynamic-link: deadlock between pthread_create and ctors
753 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
754 [28361] nptl: Fix for bug 12889 causes setxid deadlock
755 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
756 [28390] localedata: Update locale data to Unicode 14.0.0
757 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
759 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
761 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
762 to tgkill (getpid (), gettid())
763 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
764 [28457] dynamic-link: Missing reldepmod4.so dependency for
766 [28469] time: linux: struct timex is not correctly set for 32-bit
767 systems with TIMESIZE=64
768 [28470] regex: Buffer read overrun in regular expression searching
769 [28475] string: Incorrect access attribute on memfrob
770 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
771 spurious NUL character on state reset
772 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
774 [28550] dynamic-link: FAIL: tst-dso-
775 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
777 [28554] build: Undefined generate-md5
778 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
780 [28607] nptl: Masked signals are delivered on thread exit
781 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
782 lack of cpu counting /proc fallback with glibc 2.34
783 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
784 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
785 [28648] dynamic-link: Running ld.so on statically linked binaries
787 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
789 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
790 [28678] nptl: nptl/tst-create1 hangs sporadically
791 [28688] dynamic-link: PT_LOAD p_align check is too strict
792 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
794 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
795 timezones generated by tzcode-2021d and later
796 [28713] math: GCC 12 miscompiles libm
797 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
798 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
799 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
800 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
801 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
802 Assertion `GL(dl_rtld_map).l_libname' failed!
803 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
804 [28757] nptl: GDB printer tests failed with new GDB
805 [28765] math: x86_64 libmvec atan2 accuracy
806 [28766] manual: Document libmvec accuracy
807 [28768] network: Buffer overflow in svcunix_create with long pathnames
809 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
811 [28770] libc: Unexpected return value from realpath() for too long
812 results (CVE-2021-3998)
813 [28771] libc: %ebx optimization macros are incompatible with .altmacro
815 [28780] build: --disable-default-pie doesn't work on static programs
816 [28782] libc: x86-64 ISA level for glibc itself is always
818 [28792] glob: possible wrong behaviour with patterns with double [
820 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
821 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
822 empty mon_decimal_point_wc
829 * In order to support smoother in-place-upgrades and to simplify
830 the implementation of the runtime all functionality formerly
831 implemented in the libraries libpthread, libdl, libutil, libanl has
832 been integrated into libc. New applications do not need to link with
833 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
834 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
835 provided, so that the linker options keep working. Applications which
836 have been linked against glibc 2.33 or earlier continue to load the
837 corresponding shared objects (which are now empty). The integration
838 of those libraries into libc means that additional symbols become
839 available by default. This can cause applications that contain weak
840 references to take unexpected code paths that would only have been
841 used in previous glibc versions when e.g. preloading libpthread.so.0,
842 potentially exposing application bugs.
844 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
845 PTHREAD_STACK_MIN is no longer constant and is redefined to
846 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
847 sets for modern architectural features like Arm SVE.
849 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
850 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
851 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
852 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
853 dynamic sized register sets for modern architectural features like
856 * The dynamic linker implements the --list-diagnostics option, printing
857 a dump of information related to IFUNC resolver operation and
858 glibc-hwcaps subdirectory selection.
860 * On Linux, the function execveat has been added. It operates similar to
861 execve and it is is already used to implement fexecve without requiring
862 /proc to be mounted. However, different than fexecve, if the syscall is not
863 supported by the kernel an error is returned instead of trying a fallback.
865 * The ISO C2X function timespec_getres has been added.
867 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
868 C2X, is supported to enable declarations of functions defined in Annex F
869 of C2X. Those declarations are also enabled when
870 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
871 defined, and when _GNU_SOURCE is defined.
873 * On powerpc64*, glibc can now be compiled without scv support using the
874 --disable-scv configure option.
876 * Add support for 64-bit time_t on configurations like x86 where time_t
877 is traditionally 32-bit. Although time_t still defaults to 32-bit on
878 these configurations, this default may change in future versions.
879 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
880 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
881 only enabled for Linux and the full support requires a minimum kernel
884 * The main gconv-modules file in glibc now contains only a small set of
885 essential converter modules and the rest have been moved into a supplementary
886 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
887 in the same GCONV_PATH. Similarly, external converter modules directories
888 may have supplementary configuration files in a gconv-modules.d directory
889 with names ending with .conf to logically classify the converter modules in
892 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
893 to configure the size of the thread stack cache.
895 * The function _Fork has been added as an async-signal-safe fork replacement
896 since Austin Group issue 62 dropped the async-signal-safe requirement for
897 fork (and it will be included in the future POSIX standard). The new _Fork
898 function does not run any atfork function neither resets any internal state
899 or lock (such as the malloc one), and only sets up a minimal state required
900 to call async-signal-safe functions (such as raise or execve). This function
901 is currently a GNU extension.
903 * On Linux, the close_range function has been added. It allows efficiently
904 closing a range of file descriptors on recent kernels (version 5.9).
906 * The function closefrom has been added. It closes all file descriptors
907 greater than or equal to a given integer. This function is a GNU extension,
908 although it is also present in other systems.
910 * The posix_spawn_file_actions_addclosefrom_np function has been added,
911 enabling posix_spawn and posix_spawnp to close all file descriptors greater
912 than or equal to a given integer. This function is a GNU extension,
913 although Solaris also provides a similar function.
915 * When invoked explicitly, the dynamic linker now uses the kernel to
916 execute programs that do not have any dynamic dependency (that is,
917 they are statically linked). This feature is Linux-specific.
919 Deprecated and removed features, and other changes affecting compatibility:
921 * The function pthread_mutex_consistent_np has been deprecated; programs
922 should use the equivalent standard function pthread_mutex_consistent
925 * The function pthread_mutexattr_getrobust_np has been deprecated;
926 programs should use the equivalent standard function
927 pthread_mutexattr_getrobust instead.
929 * The function pthread_mutexattr_setrobust_np has been deprecated;
930 programs should use the equivalent standard function
931 pthread_mutexattr_setrobust instead.
933 * The function pthread_yield has been deprecated; programs should use
934 the equivalent standard function sched_yield instead.
936 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
938 * Various rarely-used functions declared in <resolv.h> and
939 <arpa/nameser.h> have been deprecated. Applications are encouraged to
940 use dedicated DNS processing libraries if applicable. For <resolv.h>,
941 this affects the functions dn_count_labels, fp_nquery, fp_query,
942 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
943 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
944 p_type, putlong, putshort, res_hostalias, res_isourserver,
945 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
946 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
947 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
948 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
950 * Various symbols previously defined in libresolv have been moved to libc
951 in order to prepare for libresolv moving entirely into libc (see earlier
952 entry for merging libraries into libc). The symbols __dn_comp,
953 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
954 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
955 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
956 __res_search, __res_send formerly in libresolv have been renamed and no
957 longer have a __ prefix. They are now available in libc.
959 * The pthread cancellation handler is now installed with SA_RESTART and
960 pthread_cancel will always send the internal SIGCANCEL on a cancellation
961 request. It should not be visible to applications since the cancellation
962 handler should either act upon cancellation (if asynchronous cancellation
963 is enabled) or ignore the cancellation internal signal. However there are
964 buggy kernel interfaces (for instance some CIFS versions) that could still
965 see a spurious EINTR error when cancellation interrupts a blocking syscall.
967 * Previously, glibc installed its various shared objects under versioned
968 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
969 were provided as symbolic links. Starting with glibc 2.34, the shared
970 objects are installed under their ABI sonames directly, without
971 symbolic links. This increases compatibility with distribution
972 package managers that delete removed files late during the package
973 upgrade or downgrade process.
975 * The symbols mallwatch and tr_break are now deprecated and no longer used in
976 mtrace. Similar functionality can be achieved by using conditional
977 breakpoints within mtrace functions from within gdb.
979 * The __morecore and __after_morecore_hook malloc hooks and the default
980 implementation __default_morecore have been removed from the API. Existing
981 applications will continue to link against these symbols but the interfaces
982 no longer have any effect on malloc.
984 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
985 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
986 disabled by default in the main C library. Users looking to use these
987 features now need to preload a new debugging DSO libc_malloc_debug.so to get
988 this functionality back.
990 * The deprecated functions malloc_get_state and malloc_set_state have been
991 moved from the core C library into libc_malloc_debug.so. Legacy applications
992 that still use these functions will now need to preload libc_malloc_debug.so
993 in their environment using the LD_PRELOAD environment variable.
995 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
996 __memalign_hook and __free_hook are now removed from the API. Compatibility
997 symbols are present to support legacy programs but new applications can no
998 longer link to these symbols. These hooks no longer have any effect on glibc
999 functionality. The malloc debugging DSO libc_malloc_debug.so currently
1000 supports hooks and can be preloaded to get this functionality back for older
1001 programs. However this is a transitional measure and may be removed in a
1002 future release of the GNU C Library. Users may port away from these hooks by
1003 writing and preloading their own malloc interposition library.
1005 Changes to build and runtime requirements:
1007 * On Linux, the shm_open, sem_open, and related functions now expect the
1008 file shared memory file system to be mounted at /dev/shm. These functions
1009 no longer search among the system's mount points for a suitable
1010 replacement if /dev/shm is not available.
1012 Security related changes:
1014 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1015 a request for netgroup lookup, may crash due to a double-free,
1016 potentially resulting in degraded service or Denial of Service on the
1017 local system. Reported by Chris Schanzle.
1019 CVE-2021-33574: The mq_notify function has a potential use-after-free
1020 issue when using a notification type of SIGEV_THREAD and a thread
1021 attribute with a non-default affinity mask.
1023 CVE-2021-35942: The wordexp function may overflow the positional
1024 parameter number when processing the expansion resulting in a crash.
1025 Reported by Philippe Antoine.
1027 The following bugs are resolved with this release:
1029 [4737] libc: fork is not async-signal-safe
1030 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1031 [10353] libc: Methods for deleting all file descriptors greater than
1032 given integer (closefrom)
1033 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1034 name containing multi-byte character(s)
1035 [14469] math: Inaccurate j0f function
1036 [14470] math: Inaccurate j1f function
1037 [14471] math: Inaccurate y0f function
1038 [14472] math: Inaccurate y1f function
1039 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1041 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1042 crashes if it fails dlsym() twice
1043 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1044 [16063] nptl: Provide a pthread_once variant in libc directly
1045 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1046 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1047 [17183] manual: description of ENTRY struct in <search.h> in glibc
1049 [18435] nptl: pthread_once hangs when init routine throws an exception
1050 [18524] nptl: Missing calloc error checking in
1051 __cxa_thread_atexit_impl
1052 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1053 pthread_create and dlopen
1054 [19366] nptl: returning from a thread should disable cancellation
1055 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1056 when non-root user changes priority
1057 [20802] dynamic-link: getauxval NULL pointer dereference after static
1059 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1060 [22057] malloc: malloc_usable_size is broken with mcheck
1061 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1063 [23323] libc: [RFE] CSU startup hardening.
1064 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1066 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1067 $PLATFORM, $ORIGIN) crashes
1068 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1069 [23554] nptl: pthread_getattr_np reports wrong stack size with
1071 [24106] libc: Bash interpreter in ldd script is taken from host
1072 [24773] dynamic-link: dlerror in an secondary namespace does not use
1073 the right free implementation
1074 [25036] localedata: Update collation order for Swedish
1075 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1076 shm_open to pick wrong directory
1077 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1078 crash in IFUNC resolver due to stack canary (--enable-stack-
1080 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1081 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1082 [27111] dynamic-link: pthread_create and tls access use link_map
1083 objects that may be concurrently freed by dlclose
1084 [27132] malloc: memusagestat is linked to system librt, leading to
1085 undefined symbols on major version upgrade
1086 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1088 [27249] libc: libSegFault.so does not output signal number properly
1089 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1091 [27318] dynamic-link: glibc fails to load binaries when built with
1092 -march=sandybridge: CPU ISA level is lower than required
1093 [27343] nss: initgroups() SIGSEGVs when called on a system without
1094 nsswich.conf (in a chroot)
1095 [27346] dynamic-link: x86: PTWRITE feature check is missing
1096 [27389] network: NSS chroot hardening causes regressions in chroot
1098 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1099 [27444] libc: sysconf reports unsupported option (-1) for
1100 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1101 [27462] nscd: double-free in nscd (CVE-2021-27645)
1102 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1103 malloc/tst-malloc-thread-fail
1104 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1105 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1107 [27522] glob: glob, glob64 incorrectly marked as __THROW
1108 [27555] dynamic-link: Static tests fail with --enable-stack-
1110 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1111 information for the current directory
1112 [27577] dynamic-link: elf/ld.so --help doesn't work
1113 [27605] libc: tunables can't control xsave/xsavec selection in
1114 dl_runtime_resolve_*
1115 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1116 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1118 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1119 _nss_files_getcanonname_r) from within a dlmopen namespace.
1120 [27648] libc: FAIL: misc/tst-select
1121 [27650] stdio: vfscanf returns too early if a match is longer than
1123 [27651] libc: Performance regression after updating to 2.33
1124 [27655] string: Wrong size calculation in string/test-strnlen.c
1125 [27706] libc: select fails to update timeout on error
1126 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1127 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1128 tries resolving them lazily
1129 [27744] nptl: Support different libpthread/ld.so load orders in
1131 [27749] libc: Data race __run_exit_handlers
1132 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1134 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1135 exceeds maximum object size 2147483647
1136 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1138 [27872] build: Obsolete configure option --enable-stackguard-
1140 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1141 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1142 [27892] libc: powerpc: scv ABI error handling fails to check
1144 [27896] nptl: mq_notify does not handle separately allocated thread
1145 attributes (CVE-2021-33574)
1146 [27901] libc: TEST_STACK_ALIGN doesn't work
1147 [27902] libc: The x86-64 clone wrapper fails to align child stack
1148 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1149 [27939] libc: aarch64: clone does not align the stack
1150 [27968] libc: s390x: clone does not align the stack
1151 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1152 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1153 with n >= 0x80000000
1154 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1155 thread never allocated anything
1156 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1157 [28064] string: x86_64:wcslen implementation list has wcsnlen
1158 [28067] libc: FAIL: posix/tst-spawn5
1159 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1160 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1162 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1163 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1164 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1166 [28091] network: ns_name_skip may return 0 for domain names without
1174 * The dynamic linker accepts the --list-tunables argument which prints
1175 all the supported tunables. This option is disable if glibc is
1176 configured with tunables disabled (--enable-tunables=no).
1178 * The dynamic linker accepts the --argv0 argument and provides opportunity
1179 to change argv[0] string.
1181 * The dynamic linker loads optimized implementations of shared objects
1182 from subdirectories under the glibc-hwcaps directory on the library
1183 search path if the system's capabilities meet the requirements for
1184 that subdirectory. Initially supported subdirectories include
1185 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1186 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1187 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1188 subdirectory names correspond to the vendor-independent x86-64
1189 microarchitecture levels defined in the x86-64 psABI supplement.
1191 * The new --help option of the dynamic linker provides usage and
1192 information and library search path diagnostics.
1194 * The mallinfo2 function is added to report statistics as per mallinfo,
1195 but with larger field widths to accurately report values that are
1196 larger than fit in an integer.
1198 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1200 * Support for the RISC-V ISA running on Linux has been expanded to run on
1201 32-bit hardware. This is supported for the following ISA and ABI pairs:
1207 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1210 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1211 glibc may use additional checks that may have an additional performance
1212 overhead. At present these checks are available only on LLVM 9 and later.
1213 The latest GCC available at this time (10.2) does not support this level of
1216 Deprecated and removed features, and other changes affecting compatibility:
1218 * The mallinfo function is marked deprecated. Callers should call
1221 * When dlopen is used in statically linked programs, alternative library
1222 implementations from HWCAP subdirectories are no longer loaded.
1223 Instead, the default implementation is used.
1225 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1226 removed. To support old binaries, the vtimes function continues to exist
1227 as a compatibility symbol. Applications should use the getrlimit or
1230 * Following a change in the tzdata 2018a release upstream, the zdump
1231 program is now installed in the /usr/bin subdirectory. Previously,
1232 the /usr/sbin subdirectory was used.
1234 * On s390(x), the type float_t is now derived from the macro
1235 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1236 hardcoded to double. This does not affect the ABI of any libraries
1237 that are part of the GNU C Library, but may affect the ABI of other
1238 libraries that use this type in their interfaces. The new definition
1239 improves consistency with compiler behavior in many scenarios.
1241 * A future version of glibc will stop loading shared objects from the
1242 "tls" subdirectories on the library search path, the subdirectory that
1243 corresponds to the AT_PLATFORM system name, and also stop employing
1244 the legacy AT_HWCAP search mechanism. Applications should switch to
1245 the new glibc-hwcaps mechanism instead; if they do not do that, only
1246 the baseline version (directly from the search path directory) will be
1249 Changes to build and runtime requirements:
1251 * On Linux, the system administrator needs to configure /dev/pts with
1252 the intended access modes for pseudo-terminals. glibc no longer
1253 attempts to adjust permissions of terminal devices. The previous glibc
1254 defaults ("tty" group, user read/write and group write) already
1255 corresponded to what most systems used, so that grantpt did not
1256 perform any adjustments.
1258 * On Linux, the posix_openpt and getpt functions no longer attempt to
1259 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1260 (and pseudo-terminals are supported), a devpts file system is mounted
1261 on /dev/pts. Current systems already meet these requirements.
1263 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1265 Security related changes:
1267 CVE-2021-3326: An assertion failure during conversion from the
1268 ISO-20220-JP-3 character set using the iconv function has been fixed.
1269 This assertion was triggered by certain valid inputs in which the
1270 converted output contains a combined sequence of two wide characters
1271 crossing a buffer boundary. Reported by Tavis Ormandy.
1273 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1274 invoked with input containing redundant shift sequences in the IBM1364,
1275 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1277 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1278 when invoked with UCS4 input containing an invalid character.
1280 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1281 invoked with EUC-KR input containing invalid multibyte input sequences.
1283 The following bugs are resolved with this release:
1285 [10635] libc: realpath portability patches
1286 [16124] dynamic-link: ld.so should allow to change argv[0]
1287 [17924] malloc: 'free' should not set errno
1288 [18683] libc: Linux faccessat implementation can incorrectly ignore
1290 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1291 [23091] hurd: missing waitid support
1292 [23249] libc: Epyc and other current AMD CPUs do not select the
1293 "haswell" platform subdirectory
1294 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1296 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1298 [24941] libc: Make grantpt usable after multi-threaded fork in more
1300 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1301 [24973] locale: iconv encounters segmentation fault when converting
1302 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1303 [25399] string: undefined reference to `__warn_memset_zero_len' when
1304 changing gnuc version
1305 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1307 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1309 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1310 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1311 [26100] libc: Race in syslog(3) with regards to tag printing.
1312 [26124] libc: Export <cpu-features.h>
1313 [26130] nscd: Inconsistent nscd cache during pruning
1314 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1315 [26224] locale: iconv hangs when converting some invalid inputs from
1316 several IBM character sets (CVE-2020-27618)
1317 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1318 too much stack space
1319 [26343] manual: invalid documented return type for strerrorname_np(),
1320 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1321 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1323 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1325 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1326 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1328 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1329 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1330 [26555] string: strerrorname_np does not return the documented value
1331 [26592] libc: pointer arithmetic overflows in realpath
1332 [26600] network: Transaction ID collisions cause slow DNS lookups in
1334 [26606] libc: [2.33 Regression] pselect is broken on x32
1335 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1336 [26620] glob: fnmatch with collating symbols results in segmentation
1338 [26625] libc: [2.33 Regression] CET is disabled
1339 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1340 at the end of a memory mapping
1341 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1342 by the caller to the kernel
1343 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1344 [26647] build: [-Werror=array-parameter=] due to different
1345 declarations for __sigsetjmp
1346 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1348 [26649] stdio: printf should handle non-normal x86 long double numbers
1349 gracefully (CVE-2020-29573)
1350 [26686] build: -Warray-parameter instances building with GCC 11
1351 [26687] build: -Warray-bounds instances building with GCC 11
1352 [26690] stdio: Aliasing violation in __vfscanf_internal
1353 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1354 [26726] build: GCC warning calling new_composite_name with an array of
1356 [26736] libc: FAIL: misc/tst-sysvshm-linux
1357 [26737] libc: Random FAIL: rt/tst-shm
1358 [26791] libc: Missing O_CLOEXEC in sysconf.c
1359 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1361 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1363 [26818] string: aarch64: string tests may run ifunc variants that are
1365 [26821] libc: Memory leak test failures on Fedora 33
1366 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1367 FSGSBASE/LM/RDRAND check failure
1368 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1370 [26853] libc: aarch64: Missing unwind information in statically linked
1372 [26923] locale: Assertion failure in iconv when converting invalid
1373 UCS4 (CVE-2020-29562)
1374 [26926] dynamic-link: aarch64: library dependencies are not bti
1376 [26932] libc: sh: Multiple floating point functions defined as stubs
1378 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1380 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1382 [27002] build: libc_freeres_fn build failure with GCC 11
1383 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1384 [27008] dynamic-link: ld.so.cache should have endianness markup
1385 [27042] libc: [alpha] anonymous union in struct stat confuses
1387 [27053] libc: Conformance regression in system(3) (and probably also
1389 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1391 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1392 [27083] libc: Unsafe unbounded alloca in addmntent
1393 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1395 [27130] string: "rep movsb" performance issue
1396 [27150] libc: alpha: wait4() is unavailable in static linking
1397 [27177] dynamic-link:
1398 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1400 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1401 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1402 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1403 related to combining characters (CVE-2021-3326)
1410 * Unicode 13.0.0 Support: Character encoding, character type info, and
1411 transliteration tables are all updated to Unicode 13.0.0, using
1412 generator scripts contributed by Mike FABIAN (Red Hat).
1414 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1416 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1417 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1418 Three ABIs are supported:
1424 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1425 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1427 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1428 DT_DEPAUDIT dynamic section entries of the main executable.
1430 * powerpc64le supports IEEE128 long double libm/libc redirects when
1431 using -mabi=ieeelongdouble to compile C code on supported GCC
1432 toolchains. It is recommended to use GCC 8 or newer when testing
1435 * To help detect buffer overflows and other out-of-bounds accesses
1436 several APIs have been annotated with GCC 'access' attribute. This
1437 should help GCC 10 issue better warnings.
1439 * On Linux, functions pthread_attr_setsigmask_np and
1440 pthread_attr_getsigmask_np have been added. They allow applications
1441 to specify the signal mask of a thread created with pthread_create.
1443 * The GNU C Library now provides the header file <sys/single_threaded.h>
1444 which declares the variable __libc_single_threaded. Applications are
1445 encouraged to use this variable for single-thread optimizations,
1446 instead of weak references to symbols historically defined in
1449 * The functions sigabbrev_np and sigdescr_np have been added. The
1450 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1451 SIGHUP) while sigdescr_np returns a string describing the signal number
1452 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1453 attempt to translate the return description, both functions return
1454 NULL for an invalid signal number.
1456 They should be used instead of sys_siglist or sys_sigabbrev and they
1457 are both thread and async-signal safe. These functions are GNU extensions.
1459 * The functions strerrorname_np and strerrordesc_np have been added. The
1460 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1461 while strerrordesc_np returns a string describing the error number
1462 (e.g "Invalid argument" for EINVAL). Different than strerror,
1463 strerrordesc_np does not attempt to translate the return description, both
1464 functions return NULL for an invalid error number.
1466 They should be used instead of sys_errlist and sys_nerr, both are
1467 thread and async-signal safe. These functions are GNU extensions.
1469 * AArch64 now supports standard branch protection security hardening
1470 in glibc when it is built with a GCC that is configured with
1471 --enable-standard-branch-protection (or if -mbranch-protection=standard
1472 flag is passed when building both GCC target libraries and glibc,
1473 in either case a custom GCC is needed). This includes branch target
1474 identification (BTI) and pointer authentication for return addresses
1475 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1476 extensions respectively for the protection to be effective,
1477 otherwise the used instructions are nops. User code can use PAC-RET
1478 without libc support, but BTI requires a libc that is built with BTI
1479 support, otherwise runtime objects linked into user code will not be
1482 Deprecated and removed features, and other changes affecting compatibility:
1484 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1485 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1486 RPC header files. Backward compatibility for old programs is kept
1487 only for architectures and ABIs that have been added in or before
1488 glibc 2.31. New programs need to use TI-RPC
1489 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1490 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1492 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1493 as shared library for backward compatibility and the NSS modules "nis"
1494 and "nisplus" are not built at all and libnsl's headers aren't
1495 installed. This compatibility is kept only for architectures and ABIs
1496 that have been added in or before version 2.28. Replacement
1497 implementations based on TI-RPC, which additionally support IPv6, are
1498 available from <https://github.com/thkukuk/>. This change does not
1499 affect the "compat" NSS module, which does not depend on libnsl
1500 since 2.27 and thus can be used without NIS.
1502 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1503 removed. To support old binaries, the sysctl function continues to
1504 exist as a compatibility symbol (on those architectures which had it),
1505 but always fails with ENOSYS. This reflects the removal of the system
1506 call from all architectures, starting with Linux 5.5.
1508 * The sstk function is no longer available to newly linked binaries.
1509 Its implementation always returned with a failure, and the function
1510 was not declared in any header file.
1512 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1513 sigrelse, sigignore and sigset, and the sigmask macro have been
1514 deprecated. Applications should use the sigsuspend, sigprocmask and
1515 sigaction functions instead.
1517 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1518 already supported this format for almost 20 years.
1520 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1521 are no longer available to newly linked binaries, and their declarations
1522 have been removed from <string.h>. They are exported solely as
1523 compatibility symbols to support old binaries. All programs should use
1526 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1527 are no longer available to newly linked binaries, and their declarations
1528 have been removed from <stdio.h>. They are exported solely as
1529 compatibility symbols to support old binaries. All programs should use
1530 strerror or strerror_r instead.
1532 * Both strerror and strerror_l now share the same internal buffer in the
1533 calling thread, meaning that the returned string pointer may be invalided
1534 or contents might be overwritten on subsequent calls in the same thread or
1535 if the thread is terminated. It makes strerror MT-safe.
1537 * Using weak references to libpthread functions such as pthread_create
1538 or pthread_key_create to detect the singled-threaded nature of a
1539 program is an obsolescent feature. Future versions of glibc will
1540 define pthread_create within libc.so.6 itself, so such checks will
1541 always flag the program as multi-threaded. Applications should check
1542 the __libc_single_threaded variable declared in
1543 <sys/single_threaded.h> instead.
1545 * The "files" NSS module no longer supports the "key" database (used for
1546 secure RPC). The contents of the /etc/publickey file will be ignored,
1547 regardless of the settings in /etc/nsswitch.conf. (This method of
1548 storing RPC keys only supported the obsolete and insecure AUTH_DES
1549 flavor of secure RPC.)
1551 * The __morecore and __after_morecore_hook malloc hooks and the default
1552 implementation __default_morecore have been deprecated. Applications
1553 should use malloc interposition to change malloc behavior, and mmap to
1554 allocate anonymous memory. A future version of glibc may require that
1555 applications which use the malloc hooks must preload a special shared
1556 object, to enable the hooks.
1558 * The hesiod NSS module has been deprecated and will be removed in a
1559 future version of glibc. System administrators are encouraged to
1560 switch to other approaches for networked account databases, such as
1563 Changes to build and runtime requirements:
1565 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1566 long double redirects.
1568 Security related changes:
1570 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1571 invoked with the -c option and when processing invalid multi-byte input
1572 sequences. Reported by Jan Engelhardt.
1574 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1575 corruption when they were passed a pseudo-zero argument. Reported by Guido
1576 Vranken / ForAllSecure Mayhem.
1578 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1579 expanding ~user has been fixed.
1581 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1582 memmove functions has been fixed. Discovered by Jason Royes and Samual
1583 Dytrych of the Cisco Security Assessment and Penetration Team (See
1586 The following bugs are resolved with this release:
1588 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1589 [10441] manual: Backtraces code example lacks error checking
1590 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1591 timer_sigev_thread dangerous
1592 [14231] stdio: stdio-common tests memory requirements
1593 [14578] libc: /proc-based emulation for lchmod, fchmodat
1594 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1595 filtee has constructor
1596 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1597 sequences (CVE-2016-10228)
1598 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1599 character entities for infinity & pi
1600 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1601 segfaults in applications
1602 [20543] libc: Please move from .gnu.linkonce to comdat
1603 [22489] network: gcc warns about implicit conversion in
1604 ICMP6_FILTER_SETPASS with -Wsign-conversion
1605 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1606 [23294] math: Complex _FloatN functions are redirected to the wrong
1607 function with -mlong-double-64
1608 [23296] libc: Data race in setting function descriptor during lazy
1610 [23668] dynamic-link: ldconfig: Default to the new format for
1612 [23819] hurd: hurd: Add C11 thread support
1613 [23990] build: test-container error out on failure to exec child.
1614 [23991] build: shell-container typo in run_command_array
1615 [24638] manual: Error in example of parsing a template string
1616 [24654] manual: Wrong declaration of wcschr in libc manual
1617 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1619 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1620 dynamically loaded dsos
1621 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1622 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1624 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1625 restore EAX, ECX and EDX
1626 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1627 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1628 [25420] network: Race condition in resolv_conf.c can result in caching
1629 stale configuration forever
1630 [25487] math: sinl() stack corruption from crafted input
1632 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1634 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1635 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1637 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1638 on 32 bit and old kernel
1639 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1640 [25639] localedata: Some names of days and months wrongly spelt in
1642 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1643 amount of sigset_t bytes
1644 [25691] stdio: printf: memory leak when printing long multibyte
1646 [25715] libc: system() returns wrong errors when posix_spawn fails
1647 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1648 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1649 state for conversions that produce two Unicode code points
1650 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1651 for linux x86_64 leads to livelock
1652 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1653 test failures, invalid instruction in ld.so
1654 [25790] glob: Typo in tst-fnmatch.input
1655 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1657 [25819] localedata: Update locale data to Unicode 13.0.0
1658 [25824] libc: Abnormal function of strnlen in aarch64
1659 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1660 [25896] libc: Incorrect prctl
1661 [25902] libc: Bad LOADARGS_N
1662 [25905] dynamic-link: VSX registers are corrupted during PLT
1663 resolution when glibc is built with --disable-multi-arch and --with-
1665 [25933] string: Off by one error in __strncmp_avx2 when
1666 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1668 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1669 exiting detached thread
1670 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1672 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1674 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1675 [26073] math: getpayload() has wrong return value
1676 [26076] dynamic-link: dlmopen crashes after failing to load
1677 dependencies in audit mode
1678 [26120] localedata: column width of of some Korean
1679 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1680 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1681 [26133] libc: Incorrect need_arch_feature_F16C
1682 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1684 [26149] libc: PKU is usable only if OSPKE is set
1685 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1687 [26208] libc: Incorrect bit_cpu_CLFSH
1688 [26210] network: Incorrect use of hidden symbols for global sunrpc
1690 [26211] stdio: printf integer overflow calculating allocation size
1691 [26214] stdio: printf_fp double free
1692 [26215] stdio: printf_fp memory leak
1693 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1694 [26258] nss: nss_compat should not read input files with mmap
1695 [26332] string: Incorrect cache line size load causes memory
1696 corruption in memset
1703 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1704 enable features from the draft ISO C2X standard. Only some features from
1705 this draft standard are supported by the GNU C Library, and as the draft
1706 is under active development, the set of features enabled by this macro is
1707 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1708 by compiling with "gcc -std=gnu2x".
1710 * The <math.h> functions that round their results to a narrower type now
1711 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1712 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1713 Clarification Request 13 to TS 18661-3.
1715 * The function pthread_clockjoin_np has been added, enabling join with a
1716 terminated thread with a specific clock. It allows waiting against
1717 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1719 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1721 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1722 in queries if the trust-ad option is set via the options directive in
1723 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1724 mode, the AD bit, as provided by the name server, is available to
1725 applications which call res_search and related functions. In the default
1726 mode, the AD bit is not set in queries, and it is automatically cleared in
1727 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1728 servers and the network path to them are treated as untrusted.)
1730 Deprecated and removed features, and other changes affecting compatibility:
1732 * The totalorder and totalordermag functions, and the corresponding
1733 functions for other floating-point types, now take pointer arguments to
1734 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1735 passing. This is in accordance with the resolution of Clarification
1736 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1737 floating-point arguments directly will continue to work.
1739 * The obsolete function stime is no longer available to newly linked
1740 binaries, and its declaration has been removed from <time.h>.
1741 Programs that set the system time should use clock_settime instead.
1743 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1744 in a future version of glibc. In this release, the header still exists
1745 but calling ftime will cause a compiler warning. All programs should use
1746 gettimeofday or clock_gettime instead.
1748 * The gettimeofday function no longer reports information about a
1749 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1750 many years, as it cannot handle the full complexity of the world's
1751 timezones, but hitherto we have supported it on a best-effort basis.
1752 Changes required to support 64-bit time_t on 32-bit architectures have
1753 made this no longer practical.
1755 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1756 should expect to receive a 'struct timezone' whose tz_minuteswest and
1757 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1758 happen on a few Linux-based ports. This will be corrected in a future
1761 All callers should supply a null pointer for the 'tzp' argument to
1762 gettimeofday. For accurate information about the time zone associated
1763 with the current time, use the localtime function.
1765 gettimeofday itself is obsolescent according to POSIX. We have no plans
1766 to remove access to this function, but portable programs should consider
1767 using clock_gettime instead.
1769 * The settimeofday function can still be used to set a system-wide time
1770 zone when the operating system supports it. This is because the Linux
1771 kernel reused the API, on some architectures, to describe a system-wide
1772 time-zone-like offset between the software clock maintained by the kernel,
1773 and the "RTC" clock that keeps time when the system is shut down.
1775 However, to reduce the odds of this offset being set by accident,
1776 settimeofday can no longer be used to set the time and the offset
1777 simultaneously. If both of its two arguments are non-null, the call
1778 will fail (setting errno to EINVAL).
1780 Callers attempting to set this offset should also be prepared for the call
1781 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1782 some Linux architectures. The Linux kernel maintainers are discussing a
1783 more principled replacement for the reused API. After a replacement
1784 becomes available, we will change settimeofday to fail with ENOSYS on all
1785 platforms when its 'tzp' argument is not a null pointer.
1787 settimeofday itself is obsolescent according to POSIX. Programs that set
1788 the system time should use clock_settime and/or the adjtime family of
1789 functions instead. We may cease to make settimeofday available to newly
1790 linked binaries after there is a replacement for Linux's time-zone-like
1793 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1794 the optional CAS instruction is implemented (for instance, LEON processors
1795 are still supported, but SuperSPARC processors are not).
1797 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1800 * If a lazy binding failure happens during dlopen, during the execution of
1801 an ELF constructor, the process is now terminated. Previously, the
1802 dynamic loader would return NULL from dlopen, with the lazy binding error
1803 captured in a dlerror message. In general, this is unsafe because
1804 resetting the stack in an arbitrary function call is not possible.
1806 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1807 executable stack unless explicitly configured at build time to require
1808 minimum kernel version 4.8 or newer. This is because executing
1809 floating-point branches on a non-executable stack on Linux kernels prior to
1810 4.8 can lead to application crashes for some MIPS configurations. While
1811 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1812 expected to enable non-executable stack by default with PT_GNU_STACK by
1813 default and is thus likely to trigger a crash on older kernels.
1815 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1816 non-executable stack while dropping support for older kernels.
1818 * System call wrappers for time system calls now use the new time64 system
1819 calls when available. On 32-bit targets, these wrappers attempt to call
1820 the new system calls first and fall back to the older 32-bit time system
1821 calls if they are not present. This may cause issues in environments
1822 that cannot handle unsupported system calls gracefully by returning
1823 -ENOSYS. Seccomp sandboxes are affected by this issue.
1825 Changes to build and runtime requirements:
1827 * It is no longer necessary to have recent Linux kernel headers to build
1828 working (non-stub) system call wrappers on all architectures except 64-bit
1829 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1831 * The ChangeLog file is no longer present in the toplevel directory of the
1832 source tree. ChangeLog files are located in the ChangeLog.old directory as
1833 ChangeLog.N where the highest N has the latest entries.
1835 Security related changes:
1837 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1838 out-of-bounds write when executed in a signal frame context.
1840 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1841 environment variable during program execution after a security
1842 transition, allowing local attackers to restrict the possible mapping
1843 addresses for loaded libraries and thus bypass ASLR for a setuid
1844 program. Reported by Marcin Kościelnicki.
1846 The following bugs are resolved with this release:
1848 [12031] localedata: iconv -t ascii//translit with Greek characters
1849 [15813] libc: Multiple issues in __gen_tempname
1850 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1851 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1852 [19767] libc: vdso is not used with static linking
1853 [19903] hurd: Shared mappings not being inherited by children processes
1854 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1855 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1857 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1858 Symbols-A/B Unicode blocks
1859 [23518] libc: Eliminate __libc_utmp_jump_table
1860 [24026] malloc: malloc_info() returns wrong numbers
1861 [24054] localedata: Many locales are missing date_fmt
1862 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1863 [24304] dynamic-link: Lazy binding failure during ELF
1864 constructors/destructors is not fatal
1865 [24376] libc: RISC-V symbol size confusion with _start
1866 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1868 [24824] libc: test-in-container does not install charmap files compatible
1870 [24844] regex: regex bad pointer / leakage if malloc fails
1871 [24867] malloc: Unintended malloc_info formatting changes
1872 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1873 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1874 [24882] libc: login: pututline uses potentially outdated cache
1875 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1876 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1878 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1880 [24930] dynamic-link: dlopen of PIE executable can result in
1881 _dl_allocate_tls_init assertion failure
1882 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1883 (stringop-overflow error)
1884 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1885 functions other can lead to crashes
1886 [24967] libc: jemalloc static linking causes runtime failure
1887 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1889 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1890 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1891 [25097] libc: new -Warray-bounds with GCC 10
1892 [25112] dynamic-link: dlopen must not make new objects accessible when it
1893 still can fail with an error
1894 [25139] localedata: Please add the new mnw_MM locale
1895 [25149] regex: Array bounds violation in proceed_next_node
1896 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1897 initialized correctly
1898 [25189] libc: glibc's __glibc_has_include causes issues with clang
1900 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1901 value to an unsigned
1902 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1903 binaries (CVE-2019-19126)
1904 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1906 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1908 [25232] string: <string.h> does not enable const correctness for strchr et
1910 [25233] localedata: Consider "." as the thousands separator for sl_SI
1912 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1913 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1914 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1916 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1917 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1919 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1920 (dl_initfirst) link map pointer
1921 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1922 [25423] libc: Array overflow in backtrace on powerpc
1923 [25425] network: Missing call to __resolv_context_put in
1924 getaddrinfo.c:gethosts
1931 * Unicode 12.1.0 Support: Character encoding, character type info, and
1932 transliteration tables are all updated to Unicode 12.1.0, using
1933 generator scripts contributed by Mike FABIAN (Red Hat).
1935 * The dynamic linker accepts the --preload argument to preload shared
1936 objects, in addition to the LD_PRELOAD environment variable.
1938 * The twalk_r function has been added. It is similar to the existing
1939 twalk function, but it passes an additional caller-supplied argument
1940 to the callback function.
1942 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1944 * Minguo (Republic of China) calendar support has been added as an
1945 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1948 * The entry for the new Japanese era has been added for ja_JP locale.
1950 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1951 pvalloc, memalign, and posix_memalign fail now with total object size
1952 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1953 pointer subtraction within the allocated object, where results might
1954 overflow the ptrdiff_t type.
1956 * The dynamic linker no longer refuses to load objects which reference
1957 versioned symbols whose implementation has moved to a different soname
1958 since the object has been linked. The old error message, symbol
1959 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1960 link time reference, is gone.
1962 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1963 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1964 functions. These behave similarly to their "timed" equivalents, but also
1965 accept a clockid_t parameter to determine which clock their timeout should
1966 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1967 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1968 time of the wait (unlike with pthread_condattr_setclock, which requires
1969 the clock choice at initialization time).
1971 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1972 work, new resolvers can use a second argument which can be extended in
1973 the future, currently it contains the AT_HWCAP2 value.
1975 Deprecated and removed features, and other changes affecting compatibility:
1977 * The copy_file_range function fails with ENOSYS if the kernel does not
1978 support the system call of the same name. Previously, user space
1979 emulation was performed, but its behavior did not match the kernel
1980 behavior, which was deemed too confusing. Applications which use the
1981 copy_file_range function can no longer rely on glibc to provide a fallback
1982 on kernels that do not support the copy_file_range system call, and if
1983 this function returns ENOSYS, they will need to use their own fallback.
1984 Support for copy_file_range for most architectures was added in version
1985 4.5 of the mainline Linux kernel.
1987 * The functions clock_gettime, clock_getres, clock_settime,
1988 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1989 for new applications (on architectures which had them). Instead, the
1990 definitions in libc will be used automatically, which have been available
1993 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1994 and <sys/stropts.h> have been removed.
1996 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1997 resolver flag (deprecated in glibc 2.25) have been removed.
1999 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
2000 resolver have been removed from <resolv.h>.
2002 * With --enable-bind-now, installed programs are now linked with the
2005 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
2006 configurations) has been removed, following the deprecation of this
2007 subarchitecture in version 8 of GCC, and its removal in version 9.
2009 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2010 header have been removed.
2012 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2013 deprecated and will be removed from a future version of glibc.
2014 Application should directly access /proc instead. For obtaining random
2015 bits, the getentropy function can be used.
2017 Changes to build and runtime requirements:
2019 * GCC 6.2 or later is required to build the GNU C Library.
2021 Older GCC versions and non-GNU compilers are still supported when
2022 compiling programs that use the GNU C Library.
2024 Security related changes:
2026 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2027 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2028 has undefined behavior. On x32, the size_t argument may be passed
2029 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2030 32 bits. When it happened with the sign bit of RDX register set,
2031 memcmp gave the wrong result since it treated the size argument as
2032 zero. Reported by H.J. Lu.
2034 CVE-2019-9169: Attempted case-insensitive regular-expression match
2035 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2036 over-read. Reported by Hongxu Chen.
2038 The following bugs are resolved with this release:
2040 [2872] locale: Transliteration Cyrillic -> ASCII fails
2041 [6399] libc: gettid() should have a wrapper
2042 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2043 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2044 [17396] localedata: globbing for locale by [[.collating-element.]]
2045 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2046 [18465] malloc: memusagestat is built using system C library
2047 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2048 invalid input drops valid char
2049 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2050 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2051 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2052 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2053 [23352] malloc: __malloc_check_init still defined in public header
2055 [23403] nptl: Wrong alignment of TLS variables
2056 [23501] libc: nftw() doesn't return dangling symlink's inode
2057 [23733] malloc: Check the count before calling tcache_get()
2058 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2060 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2061 [23844] nptl: pthread_rwlock_trywrlock results in hang
2062 [23983] argparse: Missing compat versions of argp_failure and argp_error
2063 for long double = double
2064 [23984] libc: Missing compat versions of err.h and error.h functions for
2065 long double = double
2066 [23996] localedata: Dutch salutations
2067 [24040] libc: riscv64: unterminated call chain in __thread_start
2068 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2070 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2071 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2073 [24114] regex: regexec buffer read overrun in "grep -i
2074 '\(\(\)*.\)*\(\)\(\)\1'"
2075 [24122] libc: Segfaults if 0 returned from la_version
2076 [24153] stdio: Some input functions do not react to stdin assignment
2077 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2078 RDX is set) (CVE-2019-7309)
2079 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2080 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2081 not the default "nor"
2082 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2083 false positives, change to modern flexible array
2084 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2085 instructions while maintaining the robust mutex list due to missing
2087 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2088 unnecessary librt dependencies
2089 [24200] localedata: Revert first_weekday removal in en_IE locale
2090 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2091 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2092 [24216] malloc: Check for large bin list corruption when inserting
2094 [24228] stdio: old x86 applications that use legacy libio crash on exit
2095 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2097 [24293] localedata: Missing Minguo calendar support for TW locales
2098 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2099 tt_RU (Tatar) locale
2100 [24307] localedata: Update locale data to Unicode 12.0.0
2101 [24323] dynamic-link: dlopen should not be able open PIE objects
2102 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2103 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2104 tt_RU (Tatar) locale
2105 [24370] localedata: Add lang_name for tt_RU locale
2106 [24372] locale: Binary locale files are not architecture independent
2107 [24394] time: strptime %Ey mis-parses final year of era
2108 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2110 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2112 [24531] malloc: Malloc tunables give tcache assertion failures
2113 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2115 [24535] localedata: Update locale data to Unicode 12.1.0
2116 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2117 kernels and break testing
2118 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2119 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2120 [-Werror=format-overflow=]
2121 [24570] libc: alpha: compat msgctl uses __IPC_64
2122 [24584] locale: Data race in __wcsmbs_clone_conv
2123 [24588] stdio: Remove codecvt vtables from libio
2124 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2126 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2127 [24632] stdio: Old binaries which use freopen with default stdio handles
2129 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2131 [24652] localedata: szl_PL spelling correction
2132 [24695] nss: nss_db: calling getpwent after endpwent crashes
2133 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2134 in /etc/nsswitch.conf
2135 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2136 [24740] libc: getdents64 type confusion
2137 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2138 always implemented in the same library
2139 [24744] libc: Remove copy_file_range emulation
2140 [24757] malloc: memusagestat is linked against system libpthread
2141 [24794] libc: Partial test suite run builds corrupt test-in-container
2149 * The getcpu wrapper function has been added, which returns the currently
2150 used CPU and NUMA node. This function is Linux-specific.
2152 * A new convenience target has been added for distribution maintainers
2153 to build and install all locales as directories with files. The new
2154 target is run by issuing the following command in your build tree:
2155 'make localedata/install-locale-files', with an optional DESTDIR
2156 to set the install root if you wish to install into a non-default
2157 configured location.
2159 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2161 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2162 for _GNU_SOURCE, to match BSD environments.
2164 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2165 indicates that it will abort the transaction prior to entering the kernel
2166 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2167 suspended, and this caused some undefined side-effects issues by aborting
2168 transactions manually. Glibc avoided it by abort transactions manually on
2169 each syscall, but it lead to performance issues on newer kernels where the
2170 HTM state is saved and restore lazily (the state being saved even when the
2171 process actually does not use HTM).
2173 * The functions posix_spawn_file_actions_addchdir_np and
2174 posix_spawn_file_actions_addfchdir_np have been added, enabling
2175 posix_spawn and posix_spawnp to run the new process in a different
2176 directory. These functions are GNU extensions. The function
2177 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2180 * The popen and system do not run atfork handlers anymore (BZ#17490).
2181 Although it is a possible POSIX violation, the POSIX rationale in
2182 pthread_atfork documentation regarding atfork handlers is to handle
2183 inconsistent mutex state after a fork call in a multi-threaded process.
2184 In both popen and system there is no direct access to user-defined mutexes.
2186 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2187 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2189 - C-SKY ABIV2 soft-float little-endian
2190 - C-SKY ABIV2 hard-float little-endian
2192 * strftime's default formatting of a locale's alternative year (%Ey)
2193 has been changed to zero-pad the year to a minimum of two digits,
2194 like "%y". This improves the display of Japanese era years during
2195 the first nine years of a new era, and is expected to be harmless
2196 for all other locales (only Japanese locales regularly have
2197 alternative year numbers less than 10). Zero-padding can be
2198 overridden with the '_' or '-' flags (which are GNU extensions).
2200 * As a GNU extension, the '_' and '-' flags can now be applied to
2201 "%EY" to control how the year number is formatted; they have the
2202 same effect that they would on "%Ey".
2204 Deprecated and removed features, and other changes affecting compatibility:
2206 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2207 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2209 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2210 in <sys/procfs.h>, has been corrected to match the type actually used by
2211 the Linux kernel. This affects the size and layout of that structure on
2212 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2214 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2215 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2216 defined in <sys/procfs.h>, has been corrected to match the type actually
2217 used by the Linux kernel. This affects the size and layout of those
2220 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2221 meant to scan a string and allocate space for it with malloc, is now
2222 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2223 defined. This extension conflicts with C99's use of '%a' to scan a
2224 hexadecimal floating-point number, which is now available to programs
2225 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2227 POSIX.1-2008 includes the feature of allocating a buffer for string input
2228 with malloc, using the modifier letter 'm' instead. Programs using
2229 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2230 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2231 C99 '%a' no longer need to avoid _GNU_SOURCE.
2233 GCC's -Wformat warnings can detect most uses of this extension, as long
2234 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2235 __attribute__ ((format (scanf, ...))).
2237 Changes to build and runtime requirements:
2239 * Python 3.4 or later is required to build the GNU C Library.
2241 * On most architectures, GCC 5 or later is required to build the GNU C
2242 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2244 Older GCC versions and non-GNU compilers are still supported when
2245 compiling programs that use the GNU C Library.
2247 Security related changes:
2249 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2250 denial of service due to resource exhaustion when processing getaddrinfo
2251 calls with crafted host names. Reported by Guido Vranken.
2253 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2254 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2255 happened, accessing the 32-bit size_t value as the full 64-bit register
2256 in the assembly string/memory functions would cause a buffer overflow.
2257 Reported by H.J. Lu.
2259 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2260 addresses with arbitrary trailing characters, potentially leading to data
2261 or command injection issues in applications.
2263 The following bugs are resolved with this release:
2265 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2266 [10496] localedata: 12h time representation in multiple locales faulty
2267 [10797] localedata: it_IT locale numeric does not have a separator for
2269 [11319] libc: dprintf doesn't handle errors properly
2270 [16346] time: mktime: potentially unsafe use of localtime_offset
2271 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2273 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2274 posix_spawn_file_actions_addfchdir_np
2275 [17426] localedata: Indian locales: set the correct date format
2276 [17490] stdio: popen should not invoke atfork handlers
2277 [17783] libc: TIOCSER_TEMT conditions inconsistent
2278 [18040] regex: use-after-free in regexec/get_subexp
2279 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2280 [20018] network: getaddrinfo should reject IP addresses with trailing
2281 characters (CVE-2016-10739)
2282 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2283 [20271] libc: Missing "\n" in __libc_fatal calls
2284 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2285 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2286 pointer argument is non-NULL
2287 [21037] stdio: open_memstream and freopen
2288 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2289 [21716] time: Crash in glibc's mktime in low-memory situations
2290 [22834] stdio: Subprocess forked by popen may crash in Linux when
2291 multithreads call popen
2292 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2293 and pthread_create fails.
2294 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2295 [23125] libc: riscv64: endless loop when throwing an exception from a
2297 [23275] nptl: Race in pthread_mutex_lock while promoting to
2298 PTHREAD_MUTEX_ELISION_NP.
2299 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2301 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2303 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2305 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2306 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2308 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2309 [23521] nss: get_next_alias nss_files file stream leak
2310 [23538] nptl: Hang in pthread_cond_broadcast
2311 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2312 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2313 [23579] libc: Errors misreported in preadv2
2314 [23597] build: support/test-container.c doesn't work with different
2316 [23603] time: mktime signed integer overflow on large timestamps
2317 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2318 [23614] libc: powerpc: missing CFI register information in __mpn_*
2320 [23637] string: Generic strstr/strcasestr fails with huge needles
2321 [23640] libc: no way to easily clear FD_CLOEXEC in
2322 posix_spawn_file_actions_adddup2()
2323 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2325 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2327 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2328 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2329 bits/types/struct_rusage.h
2330 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2332 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2334 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2335 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2336 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2338 [23724] localedata: Albanian date formats are incorrect
2339 [23735] math: libnldbl_nonshared.a references internal libm symbols
2340 [23740] localedata: kl_GL: Month names and date formats need update
2341 [23744] regex: regex refactorings to remove BE, avoid duplication
2342 [23745] time: mktime fix for Gnulib + coreutils
2343 [23758] time: Improve the width of alternate representation for year in
2345 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2346 [23789] time: mktime does not set errno on failure
2347 [23791] localedata: Wrong monetary format for ca_ES locale
2348 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2349 [23794] locale: c16rtomb does not handle surrogate pairs
2350 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2351 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2352 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2353 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2354 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2355 [23862] libc: [sh] missing kernel-features.h undefines
2356 [23864] libc: [riscv] missing kernel-features.h undefines
2357 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2358 [23907] malloc: Incorrect double-free malloc tcache check disregards
2360 [23913] libc: off-by-one in function maybe_script_execute in
2361 sysdeps/posix/spawni.c
2362 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2363 [23923] locale: Add --no-hard-links option to localedef
2364 [23927] network: Linux if_nametoindex() does not close descriptor
2366 [23961] math: powf can overflow to inf without setting errno in non-
2367 nearest rounding mode
2368 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2369 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2370 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2371 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2372 [24011] localedata: Fixed small type in comment for locale bs_BA
2373 [24018] libc: gettext() may return NULL
2374 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2375 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2376 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2378 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2379 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2381 [24046] localedata: en_US locale doesn't define date_fmt
2382 [24063] manual: @var{errno} should be @code{errno}
2383 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2384 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2386 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2388 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2390 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2392 [24112] network: Do not send DNS queries for non-host names (where all
2393 answers will be rejected)
2394 [24130] libc: alpha __remqu corrupts $f3 register
2401 * The localization data for ISO 14651 is updated to match the 2016
2402 Edition 4 release of the standard, this matches data provided by
2403 Unicode 9.0.0. This update introduces significant improvements to the
2404 collation of Unicode characters. This release deviates slightly from
2405 the standard in that the collation element ordering for lowercase and
2406 uppercase LATIN script characters is adjusted to ensure that regular
2407 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2408 is not matched by [a-z]. With the update many locales have been
2409 updated to take advantage of the new collation information. The new
2410 collation information has increased the size of the compiled locale
2411 archive or binary locales.
2413 * The GNU C Library can now be compiled with support for Intel CET, AKA
2414 Intel Control-flow Enforcement Technology. When the library is built
2415 with --enable-cet, the resulting glibc is protected with indirect
2416 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2417 compatible with all existing executables and shared libraries. This
2418 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2419 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2420 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2421 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2422 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2423 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2426 * The GNU C Library now has correct support for ABSOLUTE symbols
2427 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2428 relocated incorrectly or in some cases discarded. The GNU linker can
2429 make use of the newer semantics, but it must communicate it to the
2430 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2431 field) to indicate such support is required.
2433 * Unicode 11.0.0 Support: Character encoding, character type info, and
2434 transliteration tables are all updated to Unicode 11.0.0, using
2435 generator scripts contributed by Mike FABIAN (Red Hat).
2437 * <math.h> functions that round their results to a narrower type are added
2438 from TS 18661-1:2014 and TS 18661-3:2015:
2440 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2441 fMxaddfNx functions.
2443 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2444 fMxsubfNx functions.
2446 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2447 fMxmulfNx functions.
2449 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2450 fMxdivfNx functions.
2452 * Two grammatical forms of month names are now supported for the following
2453 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2454 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2455 support two grammatical forms in abbreviated month names: Catalan, Greek,
2458 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2459 include the support for two grammatical forms of month names.
2461 * Building and running on GNU/Hurd systems now works without out-of-tree
2464 * The renameat2 function has been added, a variant of the renameat function
2465 which has a flags argument. If the flags are zero, the renameat2 function
2466 acts like renameat. If the flag is not zero and there is no kernel
2467 support for renameat2, the function will fail with an errno value of
2468 EINVAL. This is different from the existing gnulib function renameatu,
2469 which performs a plain rename operation in case of a RENAME_NOREPLACE
2470 flags and a non-existing destination (and therefore has a race condition
2471 that can clobber the destination inadvertently).
2473 * The statx function has been added, a variant of the fstatat64
2474 function with an additional flags argument. If there is no direct
2475 kernel support for statx, glibc provides basic stat support based on
2476 the fstatat64 function.
2478 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2479 library if installed. libidn2 version 2.0.5 or later is recommended. If
2480 libidn2 is not available, internationalized domain names are not encoded
2481 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2482 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2483 with an encoding error.) Flags which used to change the IDN encoding and
2484 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2485 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2486 deprecated. They no longer have any effect.
2488 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2489 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2490 range of ELF gABI expressions including such constructs as
2491 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2492 have been further restricted, and where in the past a dynamic string
2493 token sequence may have been interpreted as a literal string it will
2494 now cause a load failure. These load failures were always considered
2495 unspecified behaviour from the perspective of the dynamic loader, and
2496 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2497 results in a load failure now.
2499 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2500 implementation includes all the standard functions provided by
2503 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2504 thrd_detach, thrd_exit, and thrd_join for thread management.
2506 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2507 mtx_destroy for mutual exclusion.
2509 - call_once for function call synchronization.
2511 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2512 cnd_wait for conditional variables.
2514 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2516 Application developers must link against libpthread to use ISO C threads.
2518 Deprecated and removed features, and other changes affecting compatibility:
2520 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2521 installed. Software that was using either header should be updated to
2522 use standard <stdio.h> interfaces instead.
2524 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2525 This was never required by the C standard, and the macros just expanded
2526 to call alternative names for the same functions. If you hoped getc and
2527 putc would provide performance improvements over fgetc and fputc, instead
2528 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2529 necessary, flockfile and funlockfile.
2531 * All stdio functions now treat end-of-file as a sticky condition. If you
2532 read from a file until EOF, and then the file is enlarged by another
2533 process, you must call clearerr or another function with the same effect
2534 (e.g. fseek, rewind) before you can read the additional data. This
2535 corrects a longstanding C99 conformance bug. It is most likely to affect
2536 programs that use stdio to read interactive input from a terminal.
2539 * The macros 'major', 'minor', and 'makedev' are now only available from
2540 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2541 headers that happen to include <sys/types.h>. These macros are rarely
2542 used, not part of POSIX nor XSI, and their names frequently collide with
2543 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2544 further explanation.
2546 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2547 these macros should first include <sys/types.h>, and then include
2548 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2550 * The tilegx*-*-linux-gnu configurations are no longer supported.
2552 * The obsolete function ustat is no longer available to newly linked
2553 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2554 function has been deprecated in favor of fstatfs and statfs.
2556 * The obsolete function nfsservctl is no longer available to newly linked
2557 binaries. This function was specific to systems using the Linux kernel
2558 and could not usefully be used with the GNU C Library on systems with
2559 version 3.1 or later of the Linux kernel.
2561 * The obsolete function name llseek is no longer available to newly linked
2562 binaries. This function was specific to systems using the Linux kernel
2563 and was not declared in a header. Programs should use the lseek64 name
2564 for this function instead.
2566 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2567 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2568 previously selected by them is now always enabled.
2570 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2571 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2572 restriction (rejecting '_' in host names, among other things) has been
2573 removed, for increased compatibility with non-IDN name resolution.
2575 * The fcntl function now have a Long File Support variant named fcntl64. It
2576 is added to fix some Linux Open File Description (OFD) locks usage on non
2577 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2578 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2579 locks act as a cancellation entrypoint.
2581 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2582 ecb_crypt, and des_setparity are no longer available to newly linked
2583 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2584 longer installed. These functions encrypted and decrypted data with the
2585 DES block cipher, which is no longer considered secure. Software that
2586 still uses these functions should switch to a modern cryptography library,
2589 * Reflecting the removal of the encrypt and setkey functions above, the
2590 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2591 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2594 * The obsolete function fcrypt is no longer available to newly linked
2595 binaries. It was just another name for the standard function crypt,
2596 and it has not appeared in any header file in many years.
2598 * We have tentative plans to hand off maintenance of the passphrase-hashing
2599 library, libcrypt, to a separate development project that will, we hope,
2600 keep up better with new passphrase-hashing algorithms. We will continue
2601 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2602 'crypt_r' should not need to change at all; however, distributions will
2603 need to install <crypt.h> and libcrypt from a separate project.
2605 In this release, if the configure option --disable-crypt is used, glibc
2606 will not install <crypt.h> or libcrypt, making room for the separate
2607 project's versions of these files. The plan is to make this the default
2608 behavior in a future release.
2610 Changes to build and runtime requirements:
2612 GNU make 4.0 or later is now required to build glibc.
2614 Security related changes:
2616 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2617 been fixed by removing the glibc-internal IDNA implementation and using
2618 the system-provided libidn2 library instead. Originally reported by Hanno
2619 Böck and Christian Weisgerber.
2621 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2622 architecture could corrupt memory. Reported by Max Horn.
2624 CVE-2018-11236: Very long pathname arguments to realpath function could
2625 result in an integer overflow and buffer overflow. Reported by Alexey
2628 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2629 architecture could write beyond the target buffer, resulting in a buffer
2630 overflow. Reported by Andreas Schwab.
2632 The following bugs are resolved with this release:
2634 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2635 [6889] manual: 'PWD' mentioned but not specified
2636 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2637 when __WORDSIZE != 64
2638 [13762] regex: re_search etc. should return -2 on memory exhaustion
2639 [13888] build: /tmp usage during testing
2640 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2641 [14092] nptl: Support C11 threads
2642 [14095] localedata: Review / update collation data from Unicode / ISO
2644 [14508] libc: -Wformat warnings
2645 [14553] libc: Namespace pollution loff_t in sys/types.h
2646 [14890] libc: Make NT_PRFPREG canonical.
2647 [15105] libc: Extra PLT references with -Os
2648 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2650 [16335] manual: Feature test macro documentation incomplete and out of
2652 [16552] libc: Unify umount implementations in terms of umount2
2653 [17082] libc: htons et al.: statement-expressions prevent use on global
2654 scope with -O1 and higher
2655 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2656 [17438] localedata: pt_BR: wrong d_fmt delimiter
2657 [17662] libc: please implement binding for the new renameat2 syscall
2658 [17721] libc: __restrict defined as /* Ignore */ even in c11
2659 [17979] libc: inconsistency between uchar.h and stdint.h
2660 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2661 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2662 horrible machine code)
2663 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2665 [18471] libc: llseek should be a compat symbol
2666 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2668 [18991] nss: nss_files skips large entry in database
2669 [19239] libc: Including stdlib.h ends up with macros major and minor being
2671 [19463] libc: linknamespace failures when compiled with -Os
2672 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2673 [19527] locale: Normalized charset name not recognized by setlocale
2674 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2675 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2677 [19728] network: out of bounds stack read in libidn function
2678 idna_to_ascii_4i (CVE-2016-6261)
2679 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2680 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2681 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2683 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2684 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2685 [20419] dynamic-link: files with large allocated notes crash in
2687 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2688 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2689 [20980] manual: CFLAGS environment variable replaces vital options
2690 [21163] regex: Assertion failure in pop_fail_stack when executing a
2691 malformed regexp (CVE-2015-8985)
2692 [21234] manual: use of CFLAGS makes glibc detect no optimization
2693 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2694 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2695 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2696 [21508] locale: intl/tst-gettext failure with latest msgfmt
2697 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2698 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2699 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2701 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2703 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2704 [22247] network: Integer overflow in the decode_digit function in
2705 puny_decode.c in libidn (CVE-2017-14062)
2706 [22342] nscd: NSCD not properly caching netgroup
2707 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2708 [22550] localedata: es_ES locale (and other es_* locales): collation
2709 should treat ñ as a primary different character, sync the collation
2710 for Spanish with CLDR
2711 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2712 by gcc configured with --enable-default-pie
2713 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2714 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2715 crossing 2GB threshold (CVE-2017-18269)
2716 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2718 [22735] time: Misleading typo in time.h source comment regarding
2720 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2721 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2722 `__assert_perror_fail ()' to `__assert_fail_base ()'
2723 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2725 [22786] libc: Stack buffer overflow in realpath() if input size is close
2726 to SSIZE_MAX (CVE-2018-11236)
2727 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2728 through an absolute DT_NEEDED path
2729 [22792] build: tcb-offsets.h dependency dropped
2730 [22797] libc: pkey_get() uses non-reserved name of argument
2731 [22807] libc: PTRACE_* constants missing for powerpc
2732 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2733 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2734 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2735 [22848] localedata: ca_ES: update date definitions from CLDR
2736 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2737 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2738 [22896] localedata: Update locale data for an_ES
2739 [22902] math: float128 test failures with GCC 8
2740 [22918] libc: multiple common of `__nss_shadow_database'
2741 [22919] libc: sparc32: backtrace yields infinite backtrace with
2743 [22926] libc: FTBFS on powerpcspe
2744 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2746 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2747 [22947] libc: FAIL: misc/tst-preadvwritev2
2748 [22963] localedata: cs_CZ: Add alternative month names
2749 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2750 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2751 [22998] dynamic-link: execstack tests are disabled when SELinux is
2753 [23005] network: Crash in __res_context_send after memory allocation
2755 [23007] math: strtod cannot handle -nan
2756 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2757 [23036] regex: regex equivalence class regression
2758 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2759 [23069] libc: sigaction broken on riscv64-linux-gnu
2760 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2761 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2762 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2763 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2764 and libc build with -Os)
2765 [23140] localedata: More languages need two forms of month names
2766 [23145] libc: _init/_fini aren't marked as hidden
2767 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2768 [23171] math: C++ iseqsig for long double converts arguments to double
2769 [23178] nscd: sudo will fail when it is run in concurrent with commands
2770 that changes /etc/passwd
2771 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2773 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2774 [23208] localedata: New locale - Lower Sorbian (dsb)
2775 [23233] regex: Memory leak in build_charclass_op function in file
2777 [23236] stdio: Harden function pointers in _IO_str_fields
2778 [23250] nptl: Offset of __private_ss differs from GCC
2779 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2780 -mtune=generic -mfpmath=sse
2781 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2783 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2784 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2786 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2787 [23277] math: nan function should not have const attribute
2788 [23279] math: scanf and strtod wrong for some hex floating-point
2789 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2791 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2792 [23303] build: undefined reference to symbol
2793 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2794 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2796 [23313] stdio: libio vtables validation and standard file object
2798 [23329] libc: The __libc_freeres infrastructure is not properly run across
2800 [23349] libc: Various glibc headers no longer compatible with
2802 [23351] malloc: Remove unused code related to heap dumps and malloc
2804 [23363] stdio: stdio-common/tst-printf.c has non-free license
2805 [23396] regex: Regex equivalence regression in single-byte locales
2806 [23422] localedata: oc_FR: More updates of locale data
2807 [23442] build: New warning with GCC 8
2808 [23448] libc: Out of bounds access in IBM-1390 converter
2809 [23456] libc: Wrong index_cpu_LZCNT
2810 [23458] build: tst-get-cpu-features-static isn't added to tests
2811 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2813 [23467] dynamic-link: x86/CET: A property note parser bug
2820 * The GNU C Library can now be compiled with support for building static
2821 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2822 executables are like static executables but can be loaded at any address
2823 and provide additional security hardening benefits at the cost of some
2824 memory and performance. When the library is built with --enable-static-pie
2825 the resulting libc.a is usable with GCC 8 and above to create static PIE
2826 executables using the GCC option '-static-pie'. This feature is currently
2827 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2828 aarch64 with binutils 2.30 or later.
2830 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2831 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2834 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2836 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2838 * In order to support faster and safer process termination the malloc API
2839 family of functions will no longer print a failure address and stack
2840 backtrace after detecting heap corruption. The goal is to minimize the
2841 amount of work done after corruption is detected and to avoid potential
2842 security issues in continued process execution. Reducing shutdown time
2843 leads to lower overall process restart latency, so there is benefit both
2844 from a security and performance perspective.
2846 * The abort function terminates the process immediately, without flushing
2847 stdio streams. Previous glibc versions used to flush streams, resulting
2848 in deadlocks and further data corruption. This change also affects
2849 process aborts as the result of assertion failures.
2851 * On platforms where long double has the IEEE binary128 format (aarch64,
2852 alpha, mips64, riscv, s390 and sparc), the math library now implements
2853 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2854 These are the same interfaces added in version 2.26 for some platforms where
2855 this format is supported but is not the format of long double.
2857 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2858 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2859 implements interfaces for that type, as defined by ISO/IEC TS
2860 18661-3:2015. These are corresponding interfaces to those supported for
2863 * The math library now implements interfaces for the _Float32, _Float64 and
2864 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2865 corresponding interfaces to those supported for _Float128.
2867 * glibc now implements the memfd_create and mlock2 functions on Linux.
2869 * Support for memory protection keys was added. The <sys/mman.h> header now
2870 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2873 * The copy_file_range function was added.
2875 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2877 * The ldconfig utility now processes `include' directives using the C/POSIX
2878 collation ordering. Previous glibc versions used locale-specific
2879 ordering, the change might break systems that relied on that.
2881 * Support for two grammatical forms of month names has been added.
2882 In a call to strftime, the "%B" and "%b" format specifiers will now
2883 produce the grammatical form required when the month is used as part
2884 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2885 required when the month is named by itself. For instance, in Greek
2886 and in many Slavic and Baltic languages, "%B" will produce the month
2887 in genitive case, and "%OB" will produce the month in nominative case.
2889 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2890 are all valid and will all accept any known form of month
2891 name---standalone or complete, abbreviated or full. In a call to
2892 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2893 the strings used by "%B" and "%b", respectively. New query
2894 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2895 used by "%OB" and "%Ob", respectively.
2897 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2898 define the strings for %OB and %Ob, respectively; these have the
2899 same syntax as "mon" and "abmon". These arrays are optional; if they
2900 are not provided then they have the same content as "mon" and "abmon",
2903 These features are provided for locales which define "alt_mon" and/or
2904 "ab_alt_mon" in their locale source data. This release includes such
2905 alternative month name data for the following languages: Belarusian,
2906 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2908 This feature is currently a GNU extension, but it is expected to
2909 be added to the next revision of POSIX, and it is also already
2910 available on some BSD-derived operating systems.
2912 This feature will cause existing statically compiled applications
2913 to fail to load locales and fall back to the builtin C/POSIX locales.
2914 See notes below for other changes affecting compatibility.
2916 * Support for the RISC-V ISA running on Linux has been added. This port
2917 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2918 for the following ISA and ABI pairs:
2924 Deprecated and removed features, and other changes affecting compatibility:
2926 * Statically compiled applications attempting to load locales compiled for the
2927 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2928 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2929 support for two grammatical forms of the month names, also extends the locale
2930 data binary format. Static applications needing locale support must be
2931 recompiled to match the runtime and data they are deployed with. In some
2932 distributions there is an upgrade window where dynamically linked applications
2933 may use a new library but the old locale data and also fall back to the
2934 builtin C/POSIX locales; restarting the application process is sufficient to
2937 * Support for statically linked applications which call dlopen is deprecated
2938 and will be removed in a future version of glibc. Applications which call
2939 dlopen need to be linked dynamically instead.
2941 * Support for old programs which use internal stdio data structures and
2942 functions is deprecated. This includes programs which use the C++ streams
2943 provided by libstdc++ in GCC 2.95. Programs which use the internal
2944 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2945 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2946 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2947 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2948 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2949 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2950 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2951 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2952 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2953 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2954 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2955 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2956 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2957 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2958 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2959 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2960 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2961 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2962 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2963 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2964 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2965 future version of glibc. Unlike other symbol removals, these old
2966 applications will not be supported using compatibility symbols.
2968 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2969 defined by <sys/ptrace.h>.
2971 * libm no longer supports SVID error handling (calling a user-provided
2972 matherr function on error) or the _LIB_VERSION variable to control error
2973 handling. (SVID error handling and the _LIB_VERSION variable still work
2974 for binaries linked against older versions of the GNU C Library.) The
2975 libieee.a library is no longer provided. math.h no longer defines struct
2976 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2977 TLOSS, PLOSS and HUGE.
2979 * The libm functions pow10, pow10f and pow10l are no longer supported for
2980 new programs. Programs should use the standard names exp10, exp10f and
2981 exp10l for these functions instead.
2983 * The mcontext_t type is no longer the same as struct sigcontext. On
2984 platforms where it was previously the same, this changes the C++ name
2985 mangling for interfaces involving this type.
2987 * The add-ons mechanism for building additional packages at the same time as
2988 glibc has been removed. The --enable-add-ons configure option is now
2991 * The --without-fp configure option is now ignored. Whether hardware
2992 floating-point instructions are used is now configured based on whether
2993 the compiler used at configure time (without any options implied by a
2994 --with-cpu= configure option) uses such instructions.
2996 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2997 the specified string can be parsed as a domain name.
2999 * In the malloc_info output, the <heap> element may contain another <aspace>
3000 element, "subheaps", which contains the number of sub-heaps.
3002 * The libresolv function p_secstodate is no longer supported for new
3005 * The tilepro-*-linux-gnu configuration is no longer supported.
3007 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3008 and will be removed in a future release. Software that is still using
3009 either header should be updated to use standard <stdio.h> interfaces
3012 libio.h was originally the header for a set of supported GNU extensions,
3013 but they have not been maintained as such in many years, they are now
3014 standing in the way of improvements to stdio, and we don't think there are
3015 any remaining external users. _G_config.h was never intended for public
3016 use, but predates the bits convention.
3018 Changes to build and runtime requirements:
3020 * bison version 2.7 or later is required to generate code in the 'intl'
3023 Security related changes:
3025 CVE-2009-5064: The ldd script would sometimes run the program under
3026 examination directly, without preventing code execution through the
3027 dynamic linker. (The glibc project disputes that this is a security
3028 vulnerability; only trusted binaries must be examined using the ldd
3031 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3032 suffered from a one-byte overflow during ~ operator processing (either
3033 on the stack or the heap, depending on the length of the user name).
3034 Reported by Tim Rühsen.
3036 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3037 would sometimes fail to free memory allocated during ~ operator
3038 processing, leading to a memory leak and, potentially, to a denial
3041 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3042 without GLOB_NOESCAPE, could write past the end of a buffer while
3043 unescaping user names. Reported by Tim Rühsen.
3045 CVE-2017-17426: The malloc function, when called with an object size near
3046 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3047 instead of NULL. This was a regression introduced with the new malloc
3048 thread cache in glibc 2.26. Reported by Iain Buclaw.
3050 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3051 to the allocation of too much memory. (This is not a security bug per se,
3052 it is mentioned here only because of the CVE assignment.) Reported by
3055 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3056 of the number of search path components. (This is not a security
3057 vulnerability per se because no trust boundary is crossed if the fix for
3058 CVE-2017-1000366 has been applied, but it is mentioned here only because
3059 of the CVE assignment.) Reported by Qualys.
3061 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3062 for AT_SECURE or SUID binaries could be used to load libraries from the
3065 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3066 succeeds without returning an absolute path due to unexpected behaviour
3067 of the Linux kernel getcwd syscall. Reported by halfdog.
3069 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3070 an object size near the value of SIZE_MAX, would return a pointer to a
3071 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3073 CVE-2018-6551: The malloc function, when called with an object size near
3074 the value of SIZE_MAX, would return a pointer to a buffer which is too
3075 small, instead of NULL.
3077 The following bugs are resolved with this release:
3079 [866] glob: glob should match dangling symlinks
3080 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3081 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3083 [5997] math: Very slow execution of sinf function
3084 [10580] localedata: hr_HR: updated locale
3085 [10871] locale: 'mon' array should contain both nominative and genitive
3087 [12349] localedata: eu_ES: incorrect thousands separator
3088 [13605] localedata: shn_MM: new Shan locale
3089 [13805] localedata: ru_RU: currency should use ',' as radix point
3090 [13953] localedata: km_KH: locale update
3091 [13994] localedata: mjw_IN: new locale
3092 [14121] build: make writes .mo files in po directory
3093 [14333] libc: Fix the race between atexit() and exit()
3094 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3095 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3097 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3098 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3099 width Latin characters
3100 [15332] localedata: es_CU: locale update
3101 [15436] stdio: Don't close or flush stdio streams on abort
3102 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3104 [16148] localedata: ca_ES: incorrect thousands separator
3105 [16750] dynamic-link: ldd should not try to execute the binaries
3107 [16777] localedata: pl_PL: incorrect thousands separator in locale
3108 [16905] localedata: hanzi: new collation
3109 [17563] localedata: cmn_TW: add hanzi collation
3110 [17750] localedata: wrong collation order of diacritics in most locales
3111 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3113 [17956] build: Build fails on missing definitions from header file
3114 nss/nss.h when Mozilla NSS is used for cryptography
3115 [18203] libc: realpath() does not handle unreachable paths correctly
3116 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3117 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3118 [18822] libc: Internal functions are called via PLT
3119 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3120 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3121 [19574] libc: glibc should support building static PIE binaries
3122 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3124 [19971] glob: glob: Do not skip entries with zero d_ino values
3125 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3126 [20008] localedata: km_KH: convert to translit_neutral
3127 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3128 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3129 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3130 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3131 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3133 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3134 they're set, wrong errors returned by gaih_inet when lookup functions
3136 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3137 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3139 [20952] localedata: yuw_PG: new locale
3140 [21084] localedata: charmaps/IBM858: new codepage
3141 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3142 [21242] libc: assert gives pedantic warning in old gcc versions
3143 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3144 __regcall calling convention
3145 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3146 [21326] libc: C99 functions are not declared for C++11 and later if
3147 _GNU_SOURCE is not predefined by g++
3148 [21457] libc: sys/ucontext.h namespace
3149 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3150 [21660] math: GCC fails to compile a formula with tgmath.h
3151 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3152 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3153 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3154 [21684] math: tgmath.h handling of complex integers
3155 [21685] math: tgmath.h handling of bit-fields
3156 [21686] math: tgmath.h handling of __int128
3157 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3159 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3161 [21750] localedata: column width of characters incompatible with classical
3163 [21754] malloc: malloc: Perform as little work as possible after heap
3164 consistency check failures
3165 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3166 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3167 [21791] string: Unused XXX_chk_XXX functions in libc.a
3168 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3170 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3172 [21845] localedata: Added new Locale bho_NP
3173 [21853] localedata: Fix abday Which looks same as day in zh_SG
3174 [21854] localedata: Added New Locale en_SC
3175 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3176 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3177 _dl_runtime_resolve_avx_slow
3178 [21885] network: getaddrinfo: gethosts does not release resolver context
3179 on memory allocation failure
3180 [21899] libc: XPG4.2 sigaction namespace
3181 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3183 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3185 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3186 errno value, causing getaddrinfo to fail
3187 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3188 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3189 instead of EAI_NODATA
3190 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3191 constant PTRACE_SEIZE_DEVEL
3192 [21930] math: C-only gcc builtins used in <math.h> isinf
3193 [21932] network: Unpaired __resolv_context_get in generic get*_r
3195 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3196 [21944] libc: sigval namespace
3197 [21951] localedata: Update hanzi collation by stroke
3198 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3199 sysdeps/x86_64/fpu/e_expf.S
3200 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3201 allocation in syscall loops)
3202 [21959] localedata: Fix Country name for xh_ZA
3203 [21960] localedata: Fix abmon for bem_ZM
3204 [21966] math: AVX2 mathvec functions use FMA without checking
3205 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3206 [21971] localedata: Added New Locale for mfe_MU
3207 [21972] libc: assert macro requires operator== (int) for its argument type
3208 [21973] math: [sparc] libm missing sqrtl compat symbol
3209 [21974] libc: Remove __bb_init_func and __bb_exit_func
3210 [21982] string: stratcliff.c: error: assuming signed overflow does not
3212 [21986] stdio: __guess_grouping is called incorrectly
3213 [21987] math: [sparc32] wrong bits/long-double.h installed
3214 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3216 [22022] localedata: Missing country_name for mni_IN
3217 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3219 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3221 [22026] locale: iconv_open: heap overflow on gconv_init failure
3222 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3223 [22035] math: [m68k] bits/math-inline.h macro namespace
3224 [22038] localedata: Fix abbreviated weeks and months for Somali
3225 [22044] localedata: Remove redundant data for Limburgish Language
3226 [22050] malloc: Linking with -lmcheck does not hook
3227 __malloc_initialize_hook correctly
3228 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3229 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3230 [22070] localedata: charmaps/UTF-8: wcwidth for
3231 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3232 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3233 Jungseong and Jongseong) should be 0
3234 [22078] nss: nss_files performance issue in multi mode
3235 [22082] math: bits/math-finite.h exp10 condition
3236 [22086] libc: pcprofiledump incorrect cross-endian condition
3237 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3238 [22095] network: Name server address allocation memory leak in resolv.conf
3240 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3242 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3243 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3245 [22111] malloc: malloc: per thread cache is not returned when thread exits
3246 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3247 [22134] libc: [linux] implement fexecve with execveat
3248 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3250 [22145] libc: ttyname() gives up too early in the face of namespaces
3251 [22146] math: C++ build issue with float128 on x86_64
3252 [22153] nptl: nptl: save error code before process termination
3253 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3254 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3255 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3256 [22165] libc: [hppa] Text relocations in libc.so
3257 [22180] libc: destructor registered via __cxa_atexit is called twice
3258 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3259 symlinks") cause "make" segfaults
3260 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3262 [22207] libc: FAIL: stdlib/test-atexit-race
3263 [22225] math: nearbyint arithmetic moved before feholdexcept
3264 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3265 [22235] math: iscanonical in C++ and float128
3266 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3267 the svid compat wrapper
3268 [22244] math: ynf and yn are wrong without the svid compat wrapper
3269 [22273] libc: Improper assert in Linux posix_spawn implementation
3270 [22284] libc: -pg -pie doesn't work
3271 [22292] locale: localedef exits with error 4 when it should be error 1
3272 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3273 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3275 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3276 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3278 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3279 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3280 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3281 [22322] libc: [mips64] wrong bits/long-double.h installed
3282 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3283 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3285 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3286 [22343] malloc: Integer overflow in posix_memalign
3287 [22347] libc: getrandom() returns the number of bytes that were copied to
3288 the buffer even though the comments say "Return 0 on success and -1 on
3290 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3291 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3293 [22370] dynamic-link: Incorrect note padding check
3294 [22375] libc: malloc returns pointer from tcache_get when should return
3295 NULL (CVE-2017-17426)
3296 [22377] math: iseqsig, float128 and C++
3297 [22382] localedata: Error in tpi_PG locale
3298 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3299 inside the ASCII printable range
3300 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3302 [22403] localedata: Slash needs escaping in some locales
3303 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3304 [22409] network: res_hnok does not accept some host names used on the
3306 [22412] network: res_dnok, res_hnok should perform syntax checks
3307 [22413] network: ns_name_pton ignores syntactically invalid trailing
3309 [22415] stdio: setvbuf can lead to invalid free/segfault
3310 [22432] build: Non-deterministic build
3311 [22439] malloc: malloc_info should compute summary statistics for all sub-
3313 [22442] network: if_nametoindex could report index for the wrong
3314 networking interface
3315 [22446] build: aliasing violation calling readlink in handle_request
3316 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3317 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3318 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3319 __nscd_hash/__nss_hash
3320 [22463] network: p_secstodate overflow handling
3321 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3322 [22478] libc: sigwait can fail with EINTR
3323 [22505] libc: ldconfig processes include directive in locale-specific
3325 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3326 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3327 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3328 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3329 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3330 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3331 same as for Croatian
3332 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3333 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3334 [22577] libc: missing newline after "cannot allocate TLS data structures
3336 [22588] manual: manual/conf.texi: missing underscore in front of
3338 [22593] math: nextafter and nexttoward are declared with const attribute
3339 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3340 [22603] string: ia64 memchr overflows internal pointer check
3341 [22605] libc: SH clone does not set the exit code correctly
3342 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3344 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3345 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3346 modified in case of success
3347 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3348 [22615] manual: manual: ambiguous wording about errno value in case of
3350 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3352 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3353 binaries or if /proc is not mounted (CVE-2017-16997)
3354 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3355 [22630] build: $(no-pie-ldflag) is no longer effective
3356 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3357 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3358 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3359 [22637] nptl: guard size is subtracted from thread stack size instead of
3361 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3362 [22657] localedata: hu_HU: Avoid double space in date
3363 [22660] math: fmax, fmin sNaN handling on alpha
3364 [22664] libc: New warning of GCC8
3365 [22665] math: alpha: ceil and floor raise inexact exceptions
3366 [22666] math: alpha: trunc raise inexact exceptions
3367 [22667] libc: makecontext lacks stack alignment on i386
3368 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3369 [22679] libc: getcwd(3) can succeed without returning an absolute path
3371 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3372 elision and tunables
3373 [22687] math: [powerpc-nofpu] complex long double functions spurious
3375 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3376 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3377 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3379 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3380 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3382 [22701] nis: Incomplete removal of libnsl
3383 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3384 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3385 [22715] dynamic-link: FAIL: elf/tst-audit10
3386 [22719] libc: Backtrace tests fail on hppa
3387 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3388 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3389 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3390 before the first call to crypt_r () in crypt/badsalttest.c
3397 * A per-thread cache has been added to malloc. Access to the cache requires
3398 no locks and therefore significantly accelerates the fast path to allocate
3399 and free small amounts of memory. Refilling an empty cache requires locking
3400 the underlying arena. Performance measurements show significant gains in a
3401 wide variety of user workloads. Workloads were captured using a special
3402 instrumented malloc and analyzed with a malloc simulator. Contributed by
3403 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3405 * Unicode 10.0.0 Support: Character encoding, character type info, and
3406 transliteration tables are all updated to Unicode 10.0.0, using
3407 generator scripts contributed by Mike FABIAN (Red Hat).
3408 These updates cause user visible changes, especially the changes in
3409 wcwidth for many emoji characters cause problems when emoji sequences
3410 are rendered with pango, see for example:
3411 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3413 * Collation of Hungarian has been overhauled and is now consistent with "The
3414 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3417 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3419 - The GNU C Library will now detect when /etc/resolv.conf has been
3420 modified and reload the changed configuration. The new resolver option
3421 “no-reload” (RES_NORELOAD) disables this behavior.
3423 - The GNU C Library now supports an arbitrary number of search domains
3424 (configured using the “search” directive in /etc/resolv.conf);
3425 previously, there was a hard limit of six domains. For backward
3426 compatibility, applications that directly modify the ‘_res’ global
3427 object are still limited to six search domains.
3429 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3430 Library will now randomly pick a name server from the configuration as a
3431 starting point. (Previously, the second name server was always used.)
3433 * The tunables feature is now enabled by default. This allows users to tweak
3434 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3436 * New function reallocarray, which resizes an allocated block (like realloc)
3437 to the product of two sizes, with a guaranteed clean failure upon integer
3438 overflow in the multiplication. Originally from OpenBSD, contributed by
3439 Dennis Wölfing and Rüdiger Sonderfeld.
3441 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3442 These are extended versions of preadv and pwritev, respectively, taking an
3443 additional flags argument. The set of supported flags depends on the
3444 running kernel; full support currently requires kernel 4.7 or later.
3446 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3447 create a new session ID for the spawned process. This feature is
3448 scheduled to be added to the next major revision of POSIX; for the time
3449 being, it is available under _GNU_SOURCE.
3451 * errno.h is now safe to use from C-preprocessed assembly language on all
3452 supported operating systems. In this context, it will only define the
3453 Exxxx constants, as preprocessor macros expanding to integer literals.
3455 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3456 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3457 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3458 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3460 To compile programs that use this feature, the compiler must support
3461 128-bit floating point with the type name _Float128 (as defined by TS
3462 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3463 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3464 must be defined to make the new interfaces visible.
3466 The new functions and macros correspond to those present for other
3467 floating-point types (except for a few obsolescent interfaces not
3468 supported for the new type), with F128 or f128 suffixes; for example,
3469 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3470 printf or scanf formats for the new type; the strfromf128 and strtof128
3471 interfaces should be used instead.
3473 Deprecated and removed features, and other changes affecting compatibility:
3475 * The synchronization that pthread_spin_unlock performs has been changed to
3476 now be equivalent to a C11 atomic store with release memory order to the
3477 spin lock's memory location. Previously, several (but not all)
3478 architectures used stronger synchronization (e.g., containing what is
3479 often called a full barrier). This change can improve performance, but
3480 may affect odd fringe uses of spin locks that depend on the previous
3481 behavior (e.g., using spin locks as atomic variables to try to implement
3482 Dekker's mutual exclusion algorithm).
3484 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3487 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3488 will only be built and installed when the GNU C Library is configured with
3489 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3490 as TIRPC or rpcsvc-proto, to be used.
3492 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3493 libnss_compat, are deprecated, and will not be built or installed by
3496 The NIS(+) support library, libnsl, is also deprecated. By default, a
3497 compatibility shared library will be built and installed, but not headers
3498 or development libraries. Only a few NIS-related programs require this
3499 library. (In particular, the GNU C Library has never required programs
3500 that use 'gethostbyname' to be linked with libnsl.)
3502 Replacement implementations based on TIRPC, which additionally support
3503 IPv6, are available from <https://github.com/thkukuk/>. The configure
3504 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3505 name service modules, to be built and installed.
3507 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3508 support is enabled, the configured recursive resolver must support EDNS.
3509 (Responding to EDNS-enabled queries with responses which are not
3510 EDNS-enabled is fine, but FORMERR responses are not.)
3512 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3513 servers have not supported this opcode for a long time.
3515 * The _res_opcodes variable has been removed from libresolv. It had been
3516 exported by accident.
3518 * <string.h> no longer includes inline versions of any string functions,
3519 as this kind of optimization is better done by the compiler. The macros
3520 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3522 * The nonstandard header <xlocale.h> has been removed. Most programs should
3523 use <locale.h> instead. If you have a specific need for the definition of
3524 locale_t with no other declarations, please contact
3525 libc-alpha@sourceware.org and explain.
3527 * The obsolete header <sys/ultrasound.h> has been removed.
3529 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3531 * The obsolete function cfree has been removed. Applications should use
3534 * The stack_t type no longer has the name struct sigaltstack. This changes
3535 the C++ name mangling for interfaces involving this type.
3537 * The ucontext_t type no longer has the name struct ucontext. This changes
3538 the C++ name mangling for interfaces involving this type.
3540 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3541 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3542 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3543 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3544 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3545 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3546 fpregset_t type no longer has the name struct fpu. This changes the C++
3547 name mangling for interfaces involving those types.
3549 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3550 synced with the kernel:
3552 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3553 are not supported on this architecture and have been removed.
3555 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3556 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3557 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3559 Programs that assume the GET/SETREGS ptrace requests are universally
3560 available will now fail to build, instead of malfunctioning at runtime.
3562 Changes to build and runtime requirements:
3564 * Linux kernel 3.2 or later is required at runtime, on all architectures
3565 supported by that kernel. (This is a change from version 2.25 only for
3568 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3570 * On most architectures, GCC 4.9 or later is required to build the GNU C
3571 Library. On powerpc64le, GCC 6.2 or later is required.
3573 Older GCC versions and non-GNU compilers are still supported when
3574 compiling programs that use the GNU C Library. (We do not know exactly
3575 how old, and some GNU extensions to C may be _de facto_ required. If you
3576 are interested in helping us make this statement less vague, please
3577 contact libc-alpha@sourceware.org.)
3579 Security related changes:
3581 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3582 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3584 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3585 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3587 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3588 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3591 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3592 fixed (CVE-2017-12133).
3594 The following bugs are resolved with this release:
3596 [984] network: Respond to changed resolv.conf in gethostbyname
3597 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3598 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3600 [12189] libc: __stack_chk_fail should not attempt a backtrace
3602 [14096] time: Race condition on timezone/tst-timezone.out
3603 [14172] localedata: az_IR: new locale
3604 [14995] build: glibc fails to build if gold is the default linker, even if
3606 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3607 [16637] network: inet_pton function is accepting IPv6 with bad format
3608 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3609 x86 and other generic code
3610 [16875] localedata: ko_KR: fix lang_name
3611 [17225] localedata: ar_SY: localized month names for May and June are
3613 [17297] localedata: da_DK: wrong date_fmt string
3614 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3615 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3616 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3617 [19066] localedata: ar_SA abbreviated day and month names are in English
3618 [19569] network: resolv: Support an arbitrary number of search domains
3619 [19570] network: Implement random DNS server selection in the stub
3621 [19838] locale: localedef fails on PA-RISC
3622 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3623 order of 0D36 and 0D37
3624 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3626 [20098] libc: FAIL: debug/backtrace-tst on hppa
3627 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3629 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3631 [20313] localedata: Update locale data to Unicode 9.0
3632 [20424] manual: Document how to provide a malloc replacement
3633 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3635 [20686] locale: Add el_GR@euro to SUPPORTED.
3636 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3637 failures consistently
3638 [21015] dynamic-link: Document and fix --enable-bind-now
3639 [21016] nptl: pthread_cond support is broken on hppa
3640 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3641 frame-pointer on i386
3642 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3644 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3645 [21088] libc: Build fails with --enable-static-nss
3646 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3647 generic c code is used
3648 [21109] libc: Tunables broken on big-endian
3649 [21112] math: powf has large ulp errors with base close to 1 and exponent
3651 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3653 [21120] malloc: glibc malloc is incompatible with GCC 7
3654 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3656 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3657 (-0.0) when linking with -lieee
3658 [21171] math: log10, log2 and lgamma return incorrect results
3659 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3660 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3661 [21207] localedata: ce_RU: update weekdays from CLDR
3662 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3663 [21217] localedata: Update months from CLDR-31
3664 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3665 [21243] libc: support_delete_temp_file should issue warning for failed
3667 [21244] libc: support resolv_test_start() socket fd close should be
3669 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3670 new posix_spawn implementation
3671 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3672 leads to lower CPU frequency
3673 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3674 [21261] libc: [sparc64] bits/setjmp.h namespace
3675 [21267] network: [mips] bits/socket.h IOC* namespace
3676 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3677 [21270] libc: mmap64 silently truncates large offset values
3678 [21275] libc: posix_spawn always crashes on ia64 now
3679 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3680 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3681 [21289] libc: Incorrect declaration for 32-bit platforms with
3682 _FILE_OFFSET_BITS=64 causes build error
3683 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3684 not support gethostbyname4_r
3685 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3687 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3689 [21340] libc: Support POSIX_SPAWN_SETSID
3690 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3691 [21359] network: ns_name_pack needs additional byte in destination buffer
3692 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3693 against fragmentation attacks (CVE-2017-12132)
3694 [21369] network: resolv: Remove EDNS fallback
3695 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3697 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3698 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3699 [21393] stdio: Missing dup3 error check in freopen, freopen64
3700 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3701 [21399] localedata: Bad description for U00EC in
3702 localedata/charmaps/CP1254
3703 [21411] malloc: realloc documentation error
3704 [21426] network: sys/socket.h uio.h namespace
3705 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3706 [21445] libc: signal.h bsd_signal namespace
3707 [21455] network: Network headers stdint.h namespace
3708 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3710 [21475] network: resolv: Overlong search path is truncated mid-label
3711 [21511] libc: sigstack namespace
3712 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3713 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3714 bits/syscall.h: No such file or directory
3715 [21517] libc: struct sigaltstack namespace
3716 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3717 [21533] localedata: Update locale data to Unicode 10.0
3719 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3720 junk at end of line, first unrecognized character is `@'
3721 [21538] libc: SIG_HOLD missing for XPG4
3722 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3723 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3724 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3725 [21543] libc: sigevent namespace
3726 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3727 size for general purpose registers in mcontext_t structure
3728 [21550] libc: sigwait namespace
3729 [21552] libc: XPG4 bsd_signal namespace
3730 [21554] libc: sigpause namespace
3731 [21560] libc: sys/wait.h signal.h namespace
3732 [21561] libc: waitid namespace
3733 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3734 '/usr/include/stdlib.h': Permission denied
3735 [21575] libc: sys/wait.h missing struct rusage definition
3736 [21584] libc: sigaltstack etc namespace
3737 [21597] libc: siginterrupt namespace
3738 [21607] math: hppa: FAIL: math/test-tgmath
3739 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3741 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3742 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3743 stack and heap (CVE-2017-1000366)
3744 [21625] libc: wait3 namespace
3745 [21654] nss: Incorrect pointer alignment in NSS group merge result
3747 [21657] network: Parse interface zone id for node-local multicast
3748 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3750 [21666] libc: .symver is used on common symbol
3751 [21668] network: resolv: res_init cross-thread broadcast introduces race
3753 [21687] math: tgmath.h totalorder, totalordermag return type
3754 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3756 [21696] libc: Incorrect assumption of of __cpu_mask in
3757 posix/sched_cpucount.c
3758 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3759 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3761 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3762 leading to relocation crash
3763 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3764 `resolv_conf_matches (resp, conf)' failed.
3765 [21710] localedata: Added Samoan language locale for Samoa
3766 [21711] localedata: Pashto yesstr/nostr locale are missing
3767 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3768 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3769 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3770 [21723] localedata: yesstr/nostr missing for Chinese language locale
3771 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3773 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3775 [21728] localedata: New Locale for Tongan language
3776 [21729] localedata: incorrect LC_NAME fields for hi_IN
3777 [21733] localedata: yesstr and nostr are missing for zh_HK
3778 [21734] localedata: Missing yesstr and nostr are for kw_GB
3779 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3780 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3781 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3782 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3784 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3786 [21749] localedata: Wrong abbreviated day name (“abday”) for
3788 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3789 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3790 [21759] localedata: missing yesstr and nostr for Tigrinya
3791 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3792 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3793 [21767] localedata: Missing Bislama locales
3794 [21768] localedata: Missing yesstr and nostr for aa_ET
3795 [21770] localedata: Missing Field in li_NL
3796 [21778] nptl: Robust mutex may deadlock
3797 [21779] libc: MicroBlaze segfaults when loading libpthread
3798 [21783] localedata: Fix int_select international_call_prefixes
3799 [21784] localedata: Inconsistency in country_isbn
3800 [21788] localedata: Missing Country Postal Abbreviations
3801 [21794] localedata: Added-country_isbn-for-Italy
3802 [21795] localedata: Add/Fix country_isbn for France
3803 [21796] localedata: Added country_isbn for Republic of Korea
3804 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3805 [21799] localedata: Added int_select international_call_prefixes
3806 [21801] localedata: Added int_select international_call_prefixes
3807 [21804] nptl: Double semicolon in thread-shared-types.h
3808 [21807] localedata: LC_ADDRESS fix for pap_CW
3809 [21808] localedata: Fix LC_ADDRESS for pap_AW
3810 [21821] localedata: Added country_name in mai_IN
3811 [21822] localedata: Fix LC_TIME for mai_IN
3812 [21823] localedata: missing yesstr, nostr for sa_IN
3813 [21825] localedata: Fix name_mrs for mag_IN
3814 [21828] localedata: 2.26 changelog should mention user visible changes
3816 [21835] localedata: Added Maithili language locale for Nepal
3817 [21838] localedata: Removed redundant data for the_NP
3818 [21839] localedata: Fix LC_MONETARY for ta_LK
3819 [21844] localedata: Fix Latin characters and Months Sequence.
3820 [21848] localedata: Fix mai_NP Title Name
3825 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3826 24731-2:2010, is supported to enable declarations of functions from that
3827 TR. Note that not all functions from that TR are supported by the GNU C
3830 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3831 18661-1:2014, is supported to enable declarations of functions and macros
3832 from that TS. Note that not all features from that TS are supported by
3835 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3836 18661-4:2015, is supported to enable declarations of functions and macros
3837 from that TS. Note that most features from that TS are not supported by
3840 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3841 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3842 Since the GNU C Library defaults to a much newer revision of POSIX, this
3843 will only affect programs that specifically request an old conformance
3844 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3845 see a change in the visible declarations, but a program compiled with
3846 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3849 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3850 defined by all multithreaded code, but glibc has not required this for
3853 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3854 means that in a future release, the macros “major”, “minor”, and “makedev”
3855 will only be available from <sys/sysmacros.h>.
3857 These macros are not part of POSIX nor XSI, and their names frequently
3858 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3859 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3860 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3863 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3864 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3865 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3867 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3868 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3869 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3870 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3871 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3872 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3873 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3874 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3875 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3876 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3877 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3880 * New <math.h> features are added from TS 18661-1:2014:
3882 - Signaling NaN macros: SNANF, SNAN, SNANL.
3884 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3885 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3886 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3888 - llogb functions: the llogb, llogbf and llogbl functions, and the
3889 FP_LLOGB0 and FP_LLOGBNAN macros.
3891 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3894 - Comparison macros: iseqsig.
3896 - Classification macros: iscanonical, issubnormal, iszero.
3898 - Total order functions: totalorder, totalorderf, totalorderl,
3899 totalordermag, totalordermagf, totalordermagl.
3901 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3903 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3904 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3906 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3907 are added to libc. They convert a floating-point number into string.
3909 * Most of glibc can now be built with the stack smashing protector enabled.
3910 It is recommended to build glibc with --enable-stack-protector=strong.
3911 Implemented by Nick Alcock (Oracle).
3913 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3914 intended to be used instead of memset() to erase sensitive data after use;
3915 the compiler will not optimize out calls to explicit_bzero even if they
3916 are "unnecessary" (in the sense that no _correct_ program can observe the
3917 effects of the memory clear).
3919 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3920 to float instead of double. This does not affect the ABI of any libraries
3921 that are part of the GNU C Library, but may affect the ABI of other
3922 libraries that use this type in their interfaces.
3924 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3925 float_t and double_t types are now defined to long double instead of float
3926 and double. These options are not the default, and this does not affect
3927 the ABI of any libraries that are part of the GNU C Library, but it may
3928 affect the ABI of other libraries that use this type in their interfaces,
3929 if they are compiled or used with those options.
3931 * The getentropy and getrandom functions, and the <sys/random.h> header file
3934 * The buffer size for byte-oriented stdio streams is now limited to 8192
3935 bytes by default. Previously, on Linux, the default buffer size on most
3936 file systems was 4096 bytes (and thus remains unchanged), except on
3937 network file systems, where the buffer size was unpredictable and could be
3938 as large as several megabytes.
3940 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3941 for the Linux quota interface which predates kernel version 2.4.22 has
3944 * The malloc_get_state and malloc_set_state functions have been removed.
3945 Already-existing binaries that dynamically link to these functions will
3946 get a hidden implementation in which malloc_get_state is a stub. As far
3947 as we know, these functions are used only by GNU Emacs and this change
3948 will not adversely affect already-built Emacs executables. Any undumped
3949 Emacs executables, which normally exist only during an Emacs build, should
3950 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3952 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3953 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3954 “no-ip6-dotint” had already been the default, and support for the
3955 “ip6-dotint” option was removed from the Internet in 2006.
3957 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3958 flag from <resolv.h> have been removed. The option relied on a
3959 backwards-incompatible DNS extension which was never deployed on the
3962 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3963 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3964 They were already unimplemented.
3966 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3967 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3968 removed again from the IETF name lookup interface specification in RFC
3969 2553. Applications should use getaddrinfo instead.
3971 * DNSSEC-related declarations and definitions have been removed from the
3972 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3973 decode the data part of DNSSEC record types. Previous versions of glibc
3974 only implemented minimal support for the previous version of DNSSEC, which
3975 is incompatible with the currently deployed version.
3977 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3978 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3979 <arpa/nameser.h> header file because the distinction between RR types and
3980 meta-RR types is not officially standardized, subject to revision, and
3981 thus not suitable for encoding in a macro.
3983 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3984 and rhook members of the res_state type in <resolv.h> have been removed.
3985 The glibc stub resolver did not support these hooks, but the header file
3986 did not reflect that.
3988 * For multi-arch support it is recommended to use a GCC which has
3989 been built with support for GNU indirect functions. This ensures
3990 that correct debugging information is generated for functions
3991 selected by IFUNC resolvers. This support can either be enabled by
3992 configuring GCC with '--enable-gnu-indirect-function', or by
3993 enabling it by default by setting 'default_gnu_indirect_function'
3994 variable for a particular architecture in the GCC source file
3997 * GDB pretty printers have been added for mutex and condition variable
3998 structures in POSIX Threads. When installed and loaded in gdb these pretty
3999 printers show various pthread variables in human-readable form when read
4000 using the 'print' or 'display' commands in gdb.
4002 * Tunables feature added to allow tweaking of the runtime for an application
4003 program. This feature can be enabled with the '--enable-tunables' configure
4004 flag. The GNU C Library manual has details on usage and README.tunables has
4005 instructions on adding new tunables to the library.
4007 * A new version of condition variables functions have been implemented in
4008 the NPTL implementation of POSIX Threads to provide stronger ordering
4011 * A new version of pthread_rwlock functions have been implemented to use a more
4012 scalable algorithm primarily through not using a critical section anymore to
4015 Security related changes:
4017 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4018 have been created with makecontext could fail to terminate due to a
4019 missing .cantunwind annotation. This has been observed to lead to a hang
4020 (denial of service) in some Go applications compiled with gccgo. Reported
4021 by Andreas Schwab. (CVE-2016-6323)
4023 * The DNS stub resolver functions would crash due to a NULL pointer
4024 dereference when processing a query with a valid DNS question type which
4025 was used internally in the implementation. The stub resolver now uses a
4026 question type which is outside the range of valid question type values.
4029 The following bugs are resolved with this release:
4031 [4099] stdio: Overly aggressive caching by stream i/o functions.
4032 [7065] build: Support building glibc with -fstack-protector or -fstack-
4034 [9842] localedata: en_CA: incorrect date format
4035 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4036 before it started waiting
4037 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4038 [15765] nptl: sem_open is wrongly a cancellation point
4039 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4040 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4042 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4043 library linked with pthread
4044 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4045 "FIXME: Ingo" issue)
4046 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4047 [17252] libc: getrandom and getentropy syscall
4048 [17730] malloc: thread-local storage is sometimes improperly free()'d
4049 after being __libc_memalign()'d
4050 [18241] stdio: failed fseek on memstream does not set errno and can fail
4052 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4054 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4055 PTHREAD_PRIO_INHERIT mutex on ARM
4056 [18784] network: res_query and related function crash for special record
4057 type queries (CVE-2015-5180)
4058 [19380] math: strtod does not raise "inexact"
4059 [19387] string: Integer overflow in memchr
4060 [19390] string: Integer overflow in strncat
4061 [19398] build: linknamespace tests fail with massively parallel build
4062 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4064 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4065 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4066 [19514] libc: [PATCH] Fix spelling errors in spelling
4067 "implement"/"implementation" in several places
4068 [19582] network: Deprecate RES_USE_INET6
4069 [19673] manual: clog10 docs appear to be erroneous
4070 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4071 causes a segmentation fault
4072 [19826] libc: invalid pointer returned from __tls_get_addr with static
4074 [20016] network: resolv: Remove hooks support from the API
4075 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4077 [20033] math: [x86_64] vectorized math function don't call the __finite
4079 [20116] nptl: use after free in pthread_create
4080 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4081 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4083 [20311] nptl: please install proc_service.h
4084 [20366] libc: Compilation errors in installed headers in strict-compliance
4086 [20370] malloc: malloc: Arena free list management is still racy
4087 (incorrect fix in bug 19243)
4088 [20386] libc: assert (X = 0) does not result in GCC warning
4089 [20432] malloc: malloc: Minimize interface required for interposition
4090 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4091 in _Unwind_Backtrace (CVE-2016-6323)
4092 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4093 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4095 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4096 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4097 [20477] network: resolv: incorrect double-checked locking related to
4099 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4101 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4103 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4104 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4105 cause transition penalty
4106 [20517] math: sparcv9 missing fdiml compat symbol
4107 [20524] manual: strverscmp is inconsistent
4108 [20525] libc: <sys/quota.h> should be based on kernel headers
4109 [20539] math: GCC 7 -static -lm fails to link at -O3
4110 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4112 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4114 [20591] network: Remove obsolete DNSSEC support
4115 [20592] network: DNS resource record type classification macros in
4116 <arpa/nameser.h> are incorrect
4117 [20593] network: Update DNS RR type definitions
4118 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4119 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4121 [20629] network: libresolv: Remove support for bitstring labels
4123 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4124 assertion: "maxidx >= 2"
4125 [20660] math: [arm] Use VSQRT
4126 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4127 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4128 [20689] libc: Test for FMA should also check for AVX.
4129 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4130 [20715] math: iszero macro breaks existing code
4131 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4132 [20728] libc: powerpc: Missing TOC stub in clone
4133 [20729] build: glibc-2.24 fails to build for i486 with -Os
4134 [20750] build: Build fails with default PIE enabled gcc-6.x
4135 [20768] math: [alpha] sqrt fegetenv namespace
4136 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4138 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4139 __FLT_EVAL_METHOD__ is 2
4140 [20790] network: rpcgen buffer overrun in get_prog_declaration
4141 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4142 [20829] libc: crypt snprintf namespace
4143 [20847] libc: tst-vfork3 failure
4144 [20855] math: Default bits/mathdef.h has inappropriate float_t
4145 [20859] math: [sh4] FP_ILOGB0 invalid
4146 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4147 U+20AC), not same as GBK
4148 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4149 [20916] math: pow handling of sNaN arguments
4150 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4151 [20919] math: Bad pow (qNaN, 0) result with -lieee
4152 [20940] math: hypot sNaN handling
4153 [20947] math: fmax, fmin sNaN handling
4154 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4155 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4157 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4158 [20973] nptl: robust mutexes: Lost wake-ups
4159 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4160 [20978] nis: strlen on null pointer in nss_nisplus
4161 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4163 [21014] string: i686 memchr overflows internal pointer check
4164 [21019] libc: [mips] n32 lseek incorrect on overflow
4165 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4166 [21026] libc: [MIPS] readahead syscall is broken on n64
4167 [21028] math: Fallback fesetexceptflag should always succeed
4168 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4169 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4171 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4172 [21061] librt: [microblaze] librt lost clock_* exports
4173 [21073] libc: tunables: insecure environment variables passed to
4174 subprocesses with AT_SECURE
4175 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4179 * The minimum Linux kernel version that this version of the GNU C Library
4180 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4181 kernel version 2.6.32 or later suffices (on architectures that already
4182 required kernel versions more recent than 3.2, those requirements remain
4183 unchanged). Linux 3.2 or later kernel headers are required on all
4186 * The pap_AN locale has been deleted. This has been deprecated for a long
4187 time. It has been replaced by pap_AW & pap_CW, both of which have long
4188 been included in previous releases.
4190 * The readdir_r and readdir64_r functions have been deprecated. It is
4191 recommended to use readdir and readdir64 instead.
4193 * The type “union wait” has been removed. It was deprecated in the early
4194 1990s and never part of POSIX. Application code should use the int type
4195 instead of “union wait”.
4197 * A new NSS action is added to facilitate large distributed system
4198 administration. The action, MERGE, allows remote user stores like LDAP
4199 to be merged into local user stores like /etc/groups in order to provide
4200 easy to use, updated, and managed sets of merged credentials. The new
4201 action can be used by configuring it in /etc/nsswitch.conf:
4202 group: files [SUCCESS=merge] nis
4203 Implemented by Stephen Gallagher (Red Hat).
4205 * The deprecated __malloc_initialize_hook variable has been removed from the
4208 * The long unused localedef --old-style option has been removed. It hasn't
4209 done anything in over 16 years. Scripts using this option can safely
4212 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4213 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4214 return the next representable value in the direction of positive infinity
4215 and the nextdown functions return the next representable value in the
4216 direction of negative infinity. These are currently enabled as GNU
4219 Security related changes:
4221 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4222 could result in a stack overflow when getnetbyname was called with an
4223 overly long name. (CVE-2016-3075)
4225 * Previously, getaddrinfo copied large amounts of address data to the stack,
4226 even after the fix for CVE-2013-4458 has been applied, potentially
4227 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4228 instead. Reported by Michael Petlan. (CVE-2016-3706)
4230 * The glob function suffered from a stack-based buffer overflow when it was
4231 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4232 Reported by Alexander Cherepanov. (CVE-2016-1234)
4234 * The Sun RPC UDP client could exhaust all available stack space when
4235 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4236 alloca plugin for GCC. (CVE-2016-4429)
4238 * The IPv6 name server management code in libresolv could result in a memory
4239 leak for each thread which is created, performs a failing naming lookup,
4240 and exits. Over time, this could result in a denial of service due to
4241 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4243 The following bugs are resolved with this release:
4245 [1170] localedata: ne_NP: update Nepali locale definition file
4246 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4248 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4249 [6796] math: fdim() does not set errno on overflow
4250 [10354] libc: posix_spawn should use vfork() in more cases than presently
4251 [11213] localedata: localedata: add copyright disclaimer to locale files
4252 [12143] localedata: chr_US: new Cherokee locale
4253 [12450] localedata: sgs_LT: new locale
4254 [12676] localedata: ln_CD: new locale
4255 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4257 [13304] math: fma, fmaf, fmal produce wrong results
4258 [14259] build: --localedir arg to configure is ignored
4259 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4260 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4261 [14934] localedata: es_CL: wrong first weekday chilean locale
4262 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4264 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4266 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4267 [15368] nptl: raise() is not async-signal-safe
4268 [15479] math: ceil, floor, round and trunc raise inexact exception
4269 [15578] localedata: kk_KZ: various updates
4270 [16003] localedata: pap_AN: punt old locale
4271 [16137] localedata: iw_IL: punt old locale
4272 [16190] localedata: eo: new esperanto locale
4273 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4274 [16742] malloc: race condition: pthread_atfork() called before first
4275 malloc() results in unexpected locking behaviour/deadlocks
4276 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4278 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4279 [17565] localedata: pt_PT: wrong (work-)week start
4280 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4281 [17950] build: Build fails with -msse
4282 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4283 [18433] libc: posix_spawn does not return correctly upon failure to
4285 [18453] localedata: charmaps/IBM875: incorrect codes
4286 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4288 [18896] localedata: he_IL: improvements for currency
4289 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4290 Romanian locale data
4291 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4293 [19056] libc: Deprecate readdir_r
4294 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4296 [19198] localedata: nl_NL: small improvements for Dutch locales
4297 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4298 nameservers (CVE-2016-5417)
4299 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4301 [19400] locale: Language missing in "iso-639.def", trivial fix in
4303 [19431] malloc: Deadlock between fflush, getdelim, and fork
4304 [19505] libc: Incorrect file descriptor validity checks in
4305 posix_spawn_file_actions_add{open,close,dup2}
4306 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4307 when using RTLD_NEXT
4308 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4309 `intl/{gettextP,loadinfo}.h'
4310 [19534] libc: execle, execlp may use malloc
4311 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4312 [19573] network: res_nclose and __res_maybe_init disagree about name
4313 server initialization, breaking Hesiod
4314 [19575] localedata: Status of GB18030 tables
4315 [19581] localedata: sr_* date_fmt string contains additional newline
4316 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4318 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4319 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4320 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4321 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4323 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4325 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4327 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4328 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4329 [19633] locale: strfmon_l applies global locale to number formatting
4330 [19642] network: Memory leak in getnameinfo
4331 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4332 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4334 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4335 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4337 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4338 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4340 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4342 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4344 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4345 pointers and lengths in error-case.
4346 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4347 report errors on UTF-16 surrogates values.
4348 [19755] nscd: nscd assertion failure in gc
4349 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4350 [19759] libc: mempcpy shouldn't be inlined
4351 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4352 [19765] libc: s390 needs an optimized mempcpy
4353 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4354 NAME_MAX limit assumption (CVE-2016-1234)
4355 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4356 [19787] network: Missing and incorrect truncation checks in getnameinfo
4357 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4359 [19791] network: Assertion failure in res_query.c with un-connectable name
4361 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4362 [19822] math: libm.so install clobbers old version
4363 [19825] network: resolv: send_vc can return uninitialized data in second
4364 response to getaddrinfo
4365 [19830] network: nss_dns: should check RDATA length against buffer length
4366 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4367 confronted with A/AAAA records of invalid size
4368 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4369 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4370 [19853] stdio: Printing IBM long double in decimal with high precision is
4372 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4373 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4374 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4376 [19865] network: Assertion failure or memory leak in
4377 _nss_dns_getcanonname_r
4378 [19868] network: nss_dns: netent code does not skip over non-PTR records
4379 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4381 [19881] string: Improve x86-64 memset
4382 [19907] string: Incorrect memcpy tests
4383 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4385 [19925] libc: termios.h XCASE namespace
4386 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4387 [19929] libc: limits.h NL_NMAX namespace
4388 [19931] stdio: Memory leak in vfprintf
4389 [19957] libc: clone(CLONE_VM) access invalid parent memory
4390 [19963] localedata: en_IL: New locale
4391 [19989] stdio: stdio.h cuserid namespace
4392 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4394 [19996] locale: langinfo.h nl_langinfo_l namespace
4395 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4396 [20010] network: getaddrinfo: Stack overflow in hostent translation
4398 [20012] stdio: libio: fmemopen append mode failure
4399 [20014] stdio: stdio.h namespace for pre-threads POSIX
4400 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4401 [20023] libc: fcntl.h timespec namespace
4402 [20024] math: [x86_64] vectorized sincos trashes the stack
4403 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4404 [20041] time: sys/time.h timespec namespace
4405 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4406 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4407 [20051] libc: ttyslot in wrong header under wrong conditions
4408 [20054] libc: gethostname not declared for XPG4
4409 [20055] libc: termios.h missing tcgetsid for XPG4
4410 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4412 [20073] libc: sys/stat.h fchmod namespace
4413 [20074] libc: stdlib.h rand_r namespace
4414 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4415 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4417 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4418 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4420 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4421 [20119] libc: Wrong mask for processors level type from CPUID
4422 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4423 AS not supporting AVX512
4424 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4426 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4427 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4429 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4430 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4431 [20178] libc: posix_spawn{p} should not call exit
4432 [20191] stdio: libio: vtables hardening
4433 [20195] string: FMA4 detection requires CPUID execution with register
4435 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4436 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4438 [20212] math: acos (sNaN) returns sNaN
4439 [20213] math: asin (sNaN) returns sNaN
4440 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4441 [20218] math: [i386] asinhl (sNaN) returns sNaN
4442 [20219] math: [i386] atanhl (sNaN) returns sNaN
4443 [20222] stdio: fopencookie: Mangle function pointers
4444 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4445 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4446 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4448 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4449 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4450 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4451 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4452 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4453 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4454 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4455 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4456 [20240] math: modf (sNaN) returns sNaN
4457 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4458 [20250] math: frexp (sNaN) returns sNaN
4459 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4460 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4462 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4463 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4464 subscript is below array bounds [-Werror=array-bounds]
4465 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4466 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4468 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4469 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4471 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4472 "invalid" exceptions
4473 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4474 [20316] localedata: id_ID: Februari instead of Pebruari
4475 [20327] string: POWER8 strcasecmp returns incorrect result
4476 [20347] math: Failure: Test: j0_downward (0xap+0)
4477 [20348] libc: FAIL: misc/tst-preadvwritev64
4478 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4479 [20350] libc: There is no test for p{read,write}64
4480 [20357] math: Incorrect cos result for 1.5174239687223976
4481 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4485 * Unicode 8.0.0 Support: Character encoding, character type info, and
4486 transliteration tables are all updated to Unicode 8.0.0, using new
4487 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4488 These updates cause user visible changes, such as the fixes for bugs
4489 89, 16061, and 18568.
4491 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4492 kernel-internal CPU set size. This means that requests that change the
4493 CPU affinity which failed before (for example, an all-ones CPU mask) will
4494 now succeed. Applications that need to determine the effective CPU
4495 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4496 setting it because the kernel can adjust it (and the previous size check
4497 would not detect this in the majority of cases).
4499 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4500 the following new symbols are used: fts64_children, fts64_close,
4501 fts64_open, fts64_read and fts64_set.
4503 * getaddrinfo now detects certain invalid responses on an internal netlink
4504 socket. If such responses are received, an affected process will
4505 terminate with an error message of "Unexpected error <number> on netlink
4506 descriptor <number>" or "Unexpected netlink response of size <number> on
4507 descriptor <number>". The most likely cause for these errors is a
4508 multi-threaded application which erroneously closes and reuses the netlink
4509 file descriptor while it is used by getaddrinfo.
4511 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4512 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4513 unnecessary serialization of memory allocation requests across threads.
4514 The defect is now corrected. Users should see a substantial increase in
4515 the concurrent throughput of allocation requests for applications which
4516 trigger this bug. Affected applications typically create and
4517 destroy threads frequently. (Bug 19048 was reported and analyzed by
4520 * There is now a --disable-timezone-tools configure option for disabling the
4521 building and installing of the timezone related utilities (zic, zdump, and
4522 tzselect). This is useful for people who build the timezone data and code
4523 independent of the GNU C Library.
4525 * The obsolete header <regexp.h> has been removed. Programs that require
4526 this header must be updated to use <regex.h> instead.
4528 * The obsolete functions bdflush, create_module, get_kernel_syms,
4529 query_module and uselib are no longer available to newly linked binaries;
4530 the header <sys/kdaemon.h> has been removed. These functions and header
4531 were specific to systems using the Linux kernel and could not usefully be
4532 used with the GNU C Library on systems with version 2.6 or later of the
4535 * Optimized string, wcsmbs and memory functions for IBM z13.
4536 Implemented by Stefan Liebler.
4538 * Newly linked programs that define a variable called signgam will no longer
4539 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4540 require signgam to be set by those functions must ensure that they use the
4541 variable provided by the GNU C Library and declared in <math.h>, without
4542 defining their own copy.
4544 * The minimum GCC version that can be used to build this version of the GNU
4545 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4546 still be used to compile programs using the GNU C Library.
4548 Security related changes:
4550 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4551 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4553 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4554 the pointer guard feature. It is always enabled. Previously,
4555 LD_POINTER_GUARD could be used to disable security hardening in binaries
4556 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4559 * An integer overflow in hcreate and hcreate_r could lead to an
4560 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4562 * The catopen function no longer has unbounded stack usage. Reported by
4563 Max. (CVE-2015-8779)
4565 * The nan, nanf and nanl functions no longer have unbounded stack usage
4566 depending on the length of the string passed as an argument to the
4567 functions. Reported by Joseph Myers. (CVE-2014-9761)
4569 * A stack-based buffer overflow was found in libresolv when invoked from
4570 libnss_dns, allowing specially crafted DNS responses to seize control
4571 of execution flow in the DNS client. The buffer overflow occurs in
4572 the functions send_dg (send datagram) and send_vc (send TCP) for the
4573 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4574 family. The use of AF_UNSPEC triggers the low-level resolver code to
4575 send out two parallel queries for A and AAAA. A mismanagement of the
4576 buffers used for those queries could result in the response of a query
4577 writing beyond the alloca allocated buffer created by
4578 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4579 the overflow. Thanks to the Google Security Team and Red Hat for
4580 reporting the security impact of this issue, and Robert Holiday of
4581 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4583 The following bugs are resolved with this release:
4585 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4586 [887] math: Math library function "logb" and "nextafter" inconsistent
4587 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4588 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4589 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4590 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4592 [4404] localedata: German translation of "Alarm clock" is misleading
4593 [6799] math: nextafter() and nexttoward() doesn't set errno on
4594 overflow/underflow errors
4595 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4597 [10432] nis: _nss_nis_setnetgrent assertion failure
4598 [11460] libc: fts has no LFS support
4599 [12926] network: getaddrinfo()/make_request() may spin forever
4600 [13065] nptl: Race condition in pthread barriers
4601 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4602 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4604 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4605 [14912] libc: Rename non-installed bits/*.h headers
4606 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4607 [15367] math: Let gcc use __builtin_isinf
4608 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4609 [15421] math: lgamma wrongly sets signgam for ISO C
4610 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4611 FE_INVALID with argument out of range
4612 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4614 [15786] dynamic-link: ifunc resolver functions can smash function
4616 [15918] math: Unnecessary check for equality in hypotf()
4617 [16061] localedata: Review / update transliteration data
4618 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4620 [16141] time: strptime %z offset restriction
4621 [16171] math: drem should be alias of remainder
4622 [16296] math: fegetround is pure?
4623 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4624 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4626 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4627 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4629 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4630 "Exception "Inexact" set" on ppc32
4631 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4632 [16517] math: Missing underflow exception from tanf/tan/tanl
4633 [16519] math: Missing underflow exception from sinhf
4634 [16520] math: Missing underflow exception from tanhf
4635 [16521] math: Missing underflow exception from exp2
4636 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4638 [16734] stdio: fopen calls mmap to allocate its buffer
4639 [16961] math: nan function incorrect handling of bad sequences
4640 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4641 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4642 [16985] locale: localedef: confusing error message when opening output
4644 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4645 [17197] locale: Redundant shift character in iconv conversion output at
4647 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4648 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4649 [17250] dynamic-link: static linking breaks nss loading
4650 (getaddrinfo/getpwnam/etc...)
4651 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4653 [17441] math: isnan() should use __builtin_isnan() in GCC
4654 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4655 (related to lock elision)
4656 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4657 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4658 [17887] time: strptime should be able to parse "+01:00" style timezones
4659 [17905] libc: catopen() Multiple unbounded stack allocations
4661 [18084] libc: backtrace (..., 0) dumps core on x86
4662 [18086] libc: nice() sets errno to 0 on success
4663 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4664 is too large (CVE-2015-8778)
4665 [18251] dynamic-link: SONAME missing when audit modules provides path
4666 [18265] libc: add attributes for wchar string and memory functions
4667 [18370] math: csqrt missing underflows
4668 [18421] libc: [hppa] read-only segment has dynamic relocations
4669 [18472] libc: Obsolete syscall wrappers should be compat symbols
4670 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4671 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4672 [18525] localedata: Remove locale timezone information
4673 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4674 [18568] localedata: Update locale data to Unicode 8.0
4675 [18589] locale: sort-test.sh fails at random
4676 [18595] math: ctan, ctanh missing underflows
4677 [18604] libc: assert macro-expands its argument
4678 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4679 contains a vector instruction exception.
4680 [18611] math: j1, jn missing errno setting on underflow
4681 [18618] localedata: sync Chechen locale definitions with other *_RU
4683 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4684 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4685 [18665] network: In send_dg, the recvfrom function is NOT always using the
4686 buffer size of a newly created buffer (CVE-2015-7547)
4687 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4689 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4691 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4692 [18699] math: tilegx cproj() for various complex infinities does not yield
4694 [18724] libc: Harden put*ent functions against data injection
4695 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4696 [18755] build: build errors with -DNDEBUG
4697 [18757] stdio: fmemopen fails to set errno on failure
4698 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4700 [18781] libc: openat64 lacks O_LARGEFILE
4701 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4702 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4703 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4704 [18790] math: [ldbl-128ibm] tanhl inaccurate
4705 [18795] libc: stpncpy fortification misses buffer lengths that are
4706 statically too large
4707 [18796] build: build fails for --disable-mathvec
4708 [18803] math: hypot missing underflows
4709 [18820] stdio: fmemopen may leak memory on failure
4710 [18823] math: csqrt spurious underflows
4711 [18824] math: fma spurious underflows
4712 [18825] math: pow missing underflows
4713 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4714 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4715 [18870] build: sem_open.c fails to compile with missing symbol
4717 [18872] stdio: Fix memory leak in printf_positional
4718 [18873] libc: posix_fallocate overflow check ineffective
4719 [18875] math: Excess precision leads incorrect libm
4720 [18877] libc: arm: mmap offset regression
4721 [18887] libc: memory corruption when using getmntent on blank lines
4722 [18918] localedata: hu_HU: change time to HH:MM:SS format
4723 [18921] libc: Regression: extraneous stat() and fstat() performed by
4725 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4726 binaries (CVE-2015-8777)
4727 [18951] math: tgamma missing underflows
4728 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4730 [18953] localedata: lt_LT: change currency symbol to the euro
4731 [18956] math: powf inaccuracy
4732 [18961] math: [i386] exp missing underflows
4733 [18966] math: [i386] exp10 missing underflows
4734 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4735 [18969] build: multiple string test failures due to missing locale
4737 [18970] libc: Reference of pthread_setcancelstate in libc.a
4738 [18977] math: float / long double Bessel functions not in XSI POSIX
4739 [18980] math: i386 libm functions return with excess range and precision
4740 [18981] math: i386 scalb*, ldexp return with excess range and precision
4741 [18982] stdio: va_list and vprintf
4742 [18985] time: Passing out of range data to strftime() causes a segfault
4744 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4745 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4746 [19012] locale: iconv_open leaks memory on error path
4747 [19016] math: clog, clog10 inaccuracy
4748 [19018] nptl: Mangle function pointers in tls_dtor_list
4749 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4750 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4751 [19048] malloc: malloc: arena free list can become cyclic, increasing
4753 [19049] math: [powerpc] erfc incorrect zero sign
4754 [19050] math: [powerpc] log* incorrect zero sign
4755 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4756 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4757 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4758 [19074] network: Data race in _res_hconf_reorder_addrs
4759 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4760 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4761 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4763 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4765 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4766 [19086] manual: posix_fallocate64 documented argument order is wrong.
4767 [19088] math: lround, llround missing exceptions close to overflow
4769 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4770 [19095] math: dbl-64 lrint incorrect for 64-bit long
4771 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4772 [19124] dynamic-link: ld.so failed to build with older assembler
4773 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4774 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4775 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4776 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4777 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4778 pthread_setaffinity_np
4779 [19156] math: [ldbl-128] j0l spurious underflows
4780 [19164] nptl: tst-getcpu fails with many possible CPUs
4781 [19168] math: math/test-ildoubl and math/test-ldouble failure
4782 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4783 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4785 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4786 (FE_NOMASK_ENV) do not clear SSE exceptions
4787 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4788 _int_new_arena/reused_arena
4789 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4790 [19201] math: dbl-64 remainder incorrect sign of zero result
4791 [19205] math: bits/math-finite.h conditions do not match math.h and
4793 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4794 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4795 for C99-based standards
4796 [19212] libc: features.h not -Wundef clean
4797 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4799 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4800 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4801 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4803 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4804 "inexact" exceptions
4805 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4807 [19242] libc: strtol incorrect in Turkish locales
4808 [19243] malloc: reused_arena can pick an arena on the free list, leading
4809 to an assertion failure and reference count corruption
4810 [19253] time: tzset() ineffective when temporary TZ did not include DST
4812 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4813 [19270] math: [hppa] Shared libm missing __isnanl
4814 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4815 MAP_HUGETLB and MAP_STACK defines
4816 [19313] nptl: Wrong __cpu_mask for x32
4817 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4818 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4819 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4820 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4821 [19363] time: x32: times() return value wrongly truncates/sign extends
4823 [19367] dynamic-link: Improve branch prediction on Silvermont
4824 [19369] network: Default domain name not reset by res_ninit when "search"
4825 / "domain" entry is removed from resolv.conf
4826 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4828 [19385] localedata: bg_BG: time separator should be colon, not comma
4829 [19408] libc: linux personality syscall wrapper may erroneously return an
4830 error on 32-bit architectures
4831 [19415] libc: dladdr returns wrong names on hppa
4832 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4833 IBM905, IBM907, and IBM909
4834 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4835 [19443] build: build failures with -DDEBUG
4836 [19451] build: Make check fails on test-double-vlen2
4837 [19462] libc: Glibc failed to build with -Os
4838 [19465] math: Wrong code with -Os
4839 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4841 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4843 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4844 [19486] math: S390: Math tests fail with "Exception Inexact set".
4845 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4846 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4848 [19590] math: Fail to build shared objects that use libmvec.so functions.
4852 * The following bugs are resolved with this release:
4854 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4855 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4856 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4857 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4858 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4859 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4860 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4861 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4862 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4863 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4864 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4865 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4866 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4867 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4868 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4869 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4870 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4871 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4872 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4873 18657, 18676, 18694, 18696, 18887.
4875 * Cache information can be queried via sysconf() function on s390 e.g. with
4876 _SC_LEVEL1_ICACHE_SIZE as argument.
4878 * A buffer overflow in gethostbyname_r and related functions performing DNS
4879 requests has been fixed. If the NSS functions were called with a
4880 misaligned buffer, the buffer length change due to pointer alignment was
4881 not taken into account. This could result in application crashes or,
4882 potentially arbitrary code execution, using crafted, but syntactically
4883 valid DNS responses. (CVE-2015-1781)
4885 * The time zone file parser has been made more robust against crafted time
4886 zone files, avoiding heap buffer overflows related to the processing of
4887 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4888 large time zone data files. Overly long time zone specifiers in the TZ
4889 variable no longer result in stack overflows and crashes.
4891 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4892 for LD and GD on x86 and x86-64, has been implemented. You will need
4893 binutils-2.24 or later to enable this optimization.
4895 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4896 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4897 Hat). These updates cause user visible changes, such as the fix for bug
4900 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4901 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4902 condition in some applications.
4904 * Added vector math library named libmvec with the following vectorized x86_64
4905 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4907 The library can be disabled with --disable-mathvec. Use of the functions is
4908 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4909 Shared library libmvec.so is linked in as needed when using -lm (no need to
4910 specify -lmvec explicitly for not static builds).
4911 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4913 * A new fmemopen implementation has been added with the goal of POSIX
4914 compliance. The new implementation fixes the following long-standing
4915 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4916 old implementation is still present for use be by existing binaries.
4918 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4919 releases. It has been fixed to match 2.19 and older, but binaries built
4920 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4922 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4923 Contributed by Roland McGrath (Google).
4925 * The header <regexp.h> is deprecated, and will be removed in a future
4926 release. Use of this header will trigger a deprecation warning.
4927 Application developers should update their code to use <regex.h> instead.
4929 This header was formerly part of SUS, but was deprecated in 1994 and
4930 removed from the standard in 2001. Also, the glibc implementation
4931 leaks memory. See BZ#18681 for more details.
4935 * The following bugs are resolved with this release:
4937 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4938 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4939 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4940 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4941 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4942 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4943 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4944 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4945 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4946 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4949 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4950 too little memory for the to-be-scanned arguments and overflow the
4951 allocated buffer. The implementation now correctly computes the required
4952 buffer size when using malloc, and switches to malloc from alloca as
4955 * A new semaphore algorithm has been implemented in generic C code for all
4956 machines. Previous custom assembly implementations of semaphore were
4957 difficult to reason about or ensure that they were safe. The new version
4958 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4959 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4960 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4962 * Port to Altera Nios II has been contributed by Mentor Graphics.
4964 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4965 implementations for powerpc64/powerpc64le.
4966 Implemented by Adhemerval Zanella (IBM).
4968 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4969 and powerpc64le. This may improve lock scaling of existing programs on
4970 HTM capable systems. The lock elision code is only enabled with
4971 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4972 powerpc will issue a transaction abort on every syscall to avoid side
4973 effects being visible outside transactions.
4975 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4976 AArch64. Contributed by ARM Ltd.
4978 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4980 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4981 under certain input conditions resulting in the execution of a shell for
4982 command substitution when the application did not request it. The
4983 implementation now checks WRDE_NOCMD immediately before executing the
4984 shell and returns the error WRDE_CMDSUB as expected.
4986 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4987 processing format strings with a large number of format specifiers.
4989 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4990 infinite loop if the DNS response contained a PTR record of an unexpected
4993 * The minimum GCC version that can be used to build this version of the GNU
4994 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4995 still be used to compile programs using the GNU C Library.
4997 * The GNU C Library is now built with -Werror by default. This can be
4998 disabled by configuring with --disable-werror.
5000 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
5002 * The obsolete sigvec function has been removed. This was the original
5003 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
5004 programs have been using instead for about 25 years. Of course, ABI
5005 compatibility for old binaries using sigvec remains intact.
5007 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5008 with newer versions of bison.
5010 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5011 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5012 registers overlay two consecutive single-precision registers. MIPS32R2
5013 introduced a new FPU mode (FR=1) where double-precision registers extend the
5014 corresponding single-precision registers which is incompatible with the
5015 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5016 require the use of FR=1 making a transition necessary. New o32 ABI
5017 extensions enable users to migrate over time from the original o32 ABI
5018 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5019 tracks the ABI of any loaded object and verifies that new objects are
5020 compatible. Mode transitions will also be requested as required and
5021 unsupportable objects will be rejected. The ABI checks include both soft and
5022 hard float ABIs for o32, n32 and n64.
5024 GCC 5 with GNU binutils 2.25 onwards:
5025 It is strongly recommended that all o32 system libraries are built using the
5026 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5027 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5028 compiler using --with-fp-32=xx to set this by default.
5032 * The following bugs are resolved with this release:
5034 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5035 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5036 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5037 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5038 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5039 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5040 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5041 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5042 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5043 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5044 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5045 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5046 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5047 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5048 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5050 * Reverted change of ABI data structures for s390 and s390x:
5051 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5052 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5053 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5054 are preserved pointing straight to the same implementation as the old ones.
5055 Given that, new callers will simply provide a too-big buffer to these
5056 functions. Any applications/libraries out there that embed jmp_buf or
5057 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5058 against 2.19 headers will have to rebuilt again. This is necessary in any
5059 case to revert the breakage in their ABI caused by the glibc change.
5061 * Support for file description locks is added to systems running the
5062 Linux kernel. The standard file locking interfaces are extended to
5063 operate on file descriptions, not file descriptors, via the use of
5064 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5065 are associated with an open file instead of a process.
5067 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5069 * The minimum Linux kernel version that this version of the GNU C Library
5070 can be used with is 2.6.32.
5072 * Running the testsuite no longer terminates as soon as a test fails.
5073 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5074 with PASS or FAIL lines for individual tests. A summary of the results is
5075 printed, including a list of failing lists, and "make check" exits with
5076 error status if there were any unexpected failures. "make check
5077 stop-on-test-failure=y" may be used to keep the old behavior.
5079 * The am33 port, which had not worked for several years, has been removed
5082 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5083 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5084 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5085 conflicted with POSIX (support for which was removed in 2.19), the
5086 interfaces those macros enabled remain available when compiling with
5087 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5088 test macros defined.
5090 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5092 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5093 This may improve lock scaling of existing programs on TX capable systems.
5094 The lock elision code is only built with --enable-lock-elision=yes and
5095 then requires a GCC version supporting the TX builtins. With lock elision
5096 default mutexes are elided via __builtin_tbegin, if the cpu supports
5097 transactions. By default lock elision is not enabled and the elision code
5100 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5101 copy the path argument. This allowed programs to cause posix_spawn to
5102 deference a dangling pointer, or use an unexpected pathname argument if
5103 the string was modified after the posix_spawn_file_actions_addopen
5106 * All supported architectures now use the main glibc sysdeps directory
5107 instead of some being in a separate "ports" directory (which was
5108 distributed separately before glibc 2.17).
5110 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5111 On configurations that support it (all Linux configurations), it's now
5112 used regardless of the --enable-add-ons switch to configure. It is no
5113 longer possible to build such configurations without pthreads support.
5115 * Locale names, including those obtained from environment variables (LANG
5116 and the LC_* variables), are more tightly checked for proper syntax.
5117 setlocale will now fail (with EINVAL) for locale names that are overly
5118 long, contain slashes without starting with a slash, or contain ".." path
5119 components. (CVE-2014-0475) Previously, some valid locale names were
5120 silently replaced with the "C" locale when running in AT_SECURE mode
5121 (e.g., in a SUID program). This is no longer necessary because of the
5124 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5125 with application code using Intel MPX instructions. (With all previous
5126 versions, the MPX register state could be clobbered when making calls
5127 into or out of a shared library.) Note that while the new dynamic
5128 linker is compatible with all known x86 hardware whether or not it
5129 supports Intel MPX, some x86 instruction-set emulators might fail to
5130 handle the new instruction encodings. This is known to affect Valgrind
5131 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5132 release), and might affect other tools that do instruction emulation.
5134 * Support for loadable gconv transliteration modules has been removed.
5135 The support for transliteration modules has been non-functional for
5136 over a decade, and the removal is prompted by security defects. The
5137 normal gconv conversion modules are still supported. Transliteration
5138 with //TRANSLIT is still possible, and the //IGNORE specifier
5139 continues to be supported. (CVE-2014-5119)
5141 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5142 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5143 resulting a denial-of-service security vulnerability in applications which
5144 use functions related to iconv. (CVE-2014-6040)
5148 * The following bugs are resolved with this release:
5150 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5151 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5152 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5153 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5154 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5155 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5156 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5157 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5158 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5159 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5160 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5161 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5162 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5163 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5164 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5165 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5166 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5167 16431, 16453, 16474, 16506, 16510, 16529
5169 * Slovenian translations for glibc messages have been contributed by the
5170 Translation Project's Slovenian team of translators.
5172 * The public headers no longer use __unused nor __block. This change is to
5173 support compiling programs that are derived from BSD sources and use
5174 __unused internally, and to support compiling with Clang's -fblock
5175 extension which uses __block.
5177 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5178 large collation sequences to optimize multiple passes. This cache
5179 computation may overflow for large collation sequences and may cause a
5180 stack or buffer overflow. This is now fixed to use a slower algorithm
5181 which does not use a cache if there is an integer overflow.
5183 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5184 rules for large collation sequences to optimize multiple passes and falls
5185 back to alloca if malloc fails, resulting in a possible stack overflow.
5186 The implementation now falls back to an uncached collation sequence lookup
5189 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5190 initialized for static applications resulting in the security feature
5191 being disabled. The pointer guard is now correctly initialized to a
5192 random value for static applications. Existing static applications need
5193 to be recompiled to take advantage of the fix (bug 15754).
5195 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5196 to the d_name member of struct dirent, or omit the terminating NUL
5197 character. (Bugzilla #14699).
5199 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5200 aligned_alloc functions could allocate too few bytes or corrupt the
5201 heap when passed very large allocation size values (Bugzilla #15855,
5204 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5205 for AF_INET6 has been fixed (Bugzilla #16072).
5207 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5208 pap_CW, quz_PE, the_NP.
5210 * Substantially revised locales: gd_GB, ht_HT
5212 * The LC_ADDRESS field was updated to support country_car for almost all
5215 * ISO 1427 definitions were updated.
5217 * ISO 3166 definitions were updated.
5219 * The localedef utility now supports --big-endian and --little-endian
5220 command-line options to generate locales for a different system from that
5221 for which the C library was built.
5223 * Binary locale files now only depend on the endianness of the system for
5224 which they are generated and not on other properties of that system. As a
5225 consequence, binary files generated with new localedef may be incompatible
5226 with old versions of the GNU C Library, and binary files generated with
5227 old localedef may be incompatible with this version of the GNU C Library,
5228 in the following circumstances:
5230 + Locale files may be incompatible on m68k systems.
5232 + Locale archive files (but not separate files for individual locales) may
5233 be incompatible on systems where plain "char" is signed.
5235 * The configure option --disable-versioning has been removed. Builds with
5236 --disable-versioning had not worked for several years.
5238 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5239 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5241 * SystemTap probes for malloc have been introduced.
5243 * SystemTap probes for slow multiple precision fallback paths of
5244 transcendental functions have been introduced.
5246 * Support for powerpc64le has been added.
5248 * The soft-float powerpc port now supports e500 processors.
5250 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5252 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5253 set of header declarations that are enabled by default, even when other
5254 feature test macros or compiler options such as -std=c99 would otherwise
5255 disable some of those declarations.
5257 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5258 conflict with POSIX. The libbsd-compat library (which was a dummy library
5259 that did nothing) has also been removed.
5261 * Preliminary documentation about Multi-Thread, Async-Signal and
5262 Async-Cancel Safety has been added.
5264 * Change of ABI data structures for s390 and s390x:
5265 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5266 allow for future hardware extensions. All library functions that accept or
5267 return these structures were versioned in order to provide backwards
5268 compatibility with existing code. However, not all cases can be handled
5269 with interface versioning. If an application embeds either structure into
5270 another structure and that structure is passed to another compilation unit
5271 which expects the newer larger-sized object then any access to the new
5272 fields will result in undefined behaviour. Similarly any access to fields
5273 that were moved by the enlarging of the structures will cause undefined
5274 behaviour. To fix the undefined behaviour all objects that are part of the
5275 final in-memory image must agree on the size of structures, and this may
5276 require recompilation.
5280 * The following bugs are resolved with this release:
5282 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5283 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5284 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5285 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5286 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5287 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5288 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5289 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5290 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5291 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5292 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5293 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5294 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5297 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5298 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5299 Distributions can re-enable building and using pt_chown via the new configure
5300 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5301 considerable security risks and should only be used if the distribution
5302 understands and accepts the risks.
5304 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5307 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5308 fixed (Bugzilla #15330).
5310 * Add support for calling C++11 thread_local object destructors on thread
5311 and program exit. This needs compiler support for offloading C++11
5312 destructor calls to glibc.
5314 * Improved worst case performance of libm functions with double inputs and
5317 * Support for priority inherited mutexes in pthread condition variables on
5318 non-x86 architectures.
5320 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5322 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5324 * Optimized string functions for ARM. Implemented by Will Newton and
5327 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5329 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5332 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5333 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5335 * Added a benchmark framework to track performance of functions in glibc.
5337 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5338 It is based on draft TS 18661 and currently enabled as a GNU extension.
5340 * On Linux, the clock function now uses the clock_gettime system call
5341 for improved precision, rather than old times system call.
5343 * Added support for version-3 tz format files. This is needed when using
5344 the tz database release 2013e or later, and affects a few unusual cases --
5345 currently only TZ='America/Godthab' for time stamps after 2037.
5347 * Added new API functions pthread_getattr_default_np and
5348 pthread_setattr_default_np to get and set the default pthread
5349 attributes of a process.
5351 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5352 This may improve lock scaling of existing programs on TSX capable systems.
5353 When the --enable-lock-elision=yes parameter is specified at configure
5354 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5357 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5358 availability). Implemented by Ryan S. Arnold.
5360 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5364 * The following bugs are resolved with this release:
5366 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5367 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5368 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5369 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5370 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5371 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5372 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5373 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5374 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5375 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5376 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5377 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5378 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5379 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5380 14879, 14889, 14893, 14898, 14914.
5382 * Optimization of memcpy for MIPS.
5384 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5385 EMFILE has been fixed (Bugzilla #14889).
5387 * The add-on ports collection is now distributed in the "ports" subdirectory
5388 of the main GNU C Library distribution, rather than separately.
5390 * Port to ARM AArch64 contributed by Linaro.
5392 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5393 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5395 Implemented by Andreas Krebbel.
5397 * The new function secure_getenv allows secure access to the environment,
5398 returning NULL if running in a SUID/SGID process. This function replaces
5399 the internal function __secure_getenv.
5401 * SystemTap static probes have been added into the dynamic linker.
5402 Implemented by Gary Benson.
5404 * Optimizations of string functions strstr, strcasestr and memmem.
5405 Implemented by Maxim Kuvyrkov.
5407 * The minimum Linux kernel version that this version of the GNU C Library
5408 can be used with is 2.6.16.
5410 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5411 powerpc POWER7. Implemented by Will Schmidt.
5413 * New configure option --disable-nscd builds the C library such that it
5414 never attempts to contact the Name Service Caching Daemon (nscd).
5415 New configure option --disable-build-nscd avoids building nscd itself;
5416 this is the default if --disable-nscd is used.
5418 * Improved support for cross-compilation, including cross-testing and
5419 bootstrap builds without a previously built glibc.
5421 * Several testsuite tests are now able to test multiple IFUNC variants of an
5422 interface, rather than just testing the one that would be chooen by
5425 * New configure options --with-bugurl and --with-pkgversion, for
5426 distributors to use to embed their bug-reporting and package version
5427 information in --help and --version output.
5429 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5430 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5431 allows creation of chroots without the procfs mounted on /proc.
5433 * The `crypt' function now fails if passed salt bytes that violate the
5434 specification for those values. On Linux, the `crypt' function will
5435 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5436 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5437 when the mode is enabled.
5439 * The `clock_*' suite of functions (declared in <time.h>) is now available
5440 directly in the main C library. Previously it was necessary to link with
5441 -lrt to use these functions. This change has the effect that a
5442 single-threaded program that uses a function such as `clock_gettime' (and
5443 is not linked with -lrt) will no longer implicitly load the pthreads
5444 library at runtime and so will not suffer the overheads associated with
5445 multi-thread support in other code such as the C++ runtime library.
5447 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5452 * The following bugs are resolved with this release:
5454 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5455 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5456 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5457 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5458 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5459 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5460 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5461 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5462 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5463 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5464 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5465 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5466 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5467 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5468 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5469 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5470 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5471 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5472 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5473 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5474 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5475 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5478 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5479 configuring glibc with:
5480 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5481 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5482 Implemented by H.J. Lu.
5486 + define static_assert
5488 + do not declare gets
5490 + declare at_quick_exit and quick_exit also for ISO C11
5492 + aligned_alloc. NB: The code is deliberately allows the size parameter
5493 to not be a multiple of the alignment. This is a moronic requirement
5494 in the standard but it is only a requirement on the caller, not the
5497 + timespec_get added
5499 + uchar.h support added
5501 + CMPLX, CMPLXF, CMPLXL added
5503 Implemented by Ulrich Drepper.
5505 * Support for the IA-64 has been moved to ports.
5507 * Remove support for anything but ELF binary format
5509 * Checking versions of poll, ppoll added.
5510 Implemented by Ulrich Drepper.
5512 * More generic and 64-bit performance optimizations to math functions.
5513 Implemented by Ulrich Drepper.
5515 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5516 headers and functions available at compile time as they were before
5517 version 2.14. This option will be removed at some time in the future
5518 after the TI-RPC library becomes fully sufficient for the needs of
5519 existing applications.
5521 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5522 Note that glibc is not expected to work with any Linux kernel version
5525 * New header <sys/auxv.h> and function getauxval allowing easy access to
5526 the AT_* key-value pairs passed from the Linux kernel. The header also
5527 defines the HWCAP_* bits associated with the AT_HWCAP key.
5529 * New locales: mag_IN
5531 * New configure option --enable-systemtap builds SystemTap static probes
5532 into libc for setjmp and longjmp and into libpthread for various operations.
5533 So far the setjmp/longjmp probes and some of the libpthread probes are
5534 provided only for i*86 and x86_64.
5535 Implemented by Roland McGrath and Rayson Ho.
5537 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5539 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5542 * More optimized functions for SPARC. Implemented by David S. Miller.
5544 * Improved support for cross-compilation, especially bootstrap builds
5545 without a previously built glibc.
5547 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5548 Chris Metcalf from Tilera.
5550 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5551 now supported for ARM processors.
5553 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5554 as the name of the dynamic linker, to distinguish it from the
5555 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5557 * Support for CRIS has been removed from ports.
5559 * A new class of installed header has been documented for low-level
5560 platform-specific functionality. PowerPC added the first instance with a
5561 function to provide time base register access. Contributed by Tulio
5562 Magno Quites Machado Filho.
5564 * ix86 configurations now install header files that are consistent with
5565 what x86-64 configurations install. These same header files can be used
5566 for -m32, -m64, or -mx32 builds.
5567 Contributed by H.J. Lu.
5569 * Math library bug fixes. A thorough audit of all open math library bugs was
5570 conducted by Joseph Myers. Significant progress was made on many math
5571 library bugs resulting in more accurate exceptions and function results.
5572 Many thanks to all those that contributed including Andreas Jaeger for his
5573 patch review and work on the x87 trigonometric instruction issues.
5575 * Timezone data is no longer installed. Timezone-related binaries and scripts
5576 will continue to be installed. Users should obtain their timezone data from
5577 their distribution provider or from the tzdata package at
5578 <ftp://munnari.oz.au/pub/>.
5582 * The following bugs are resolved with this release:
5584 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5585 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5586 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5587 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5588 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5589 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5590 13484, 13506, 13515, 13523, 13524, 13538, 13540
5592 * New program pldd to list loaded object of a process
5593 Implemented by Ulrich Drepper.
5595 * Add nss_db support back to glibc. No more dependency on Berkeley db
5596 and support for initgroups lookups.
5597 Implemented by Ulrich Drepper.
5599 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5600 Contributed by HJ Lu.
5602 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5603 Contributed by HJ Lu.
5605 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5606 on x86-32 and x86-64.
5607 Contributed by Liubov Dmitrieva.
5609 * Optimized strchr and strrchr for SSE on x86-32.
5610 Contributed by Liubov Dmitrieva.
5612 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5613 for x86-64 and x86-32.
5614 Contributed by Liubov Dmitrieva.
5616 * New interfaces: scandirat, scandirat64
5617 Implemented by Ulrich Drepper.
5619 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5620 Implemented by Ulrich Drepper.
5622 * nscd now also caches the netgroup database.
5623 Implemented by Ulrich Drepper.
5625 * Integrate libm with gcc's -ffinite-math-only option.
5626 Implemented by Ulrich Drepper.
5628 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5629 to math functions. Implemented by Ulrich Drepper.
5631 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5632 Implemented by Ulrich Drepper.
5634 * New Linux interfaces: process_vm_readv, process_vm_writev
5636 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5637 Implemented by Ulrich Drepper.
5639 * Optimized nearbyint and strcasecmp for PPC.
5640 Implemented by Adhemerval Zanella.
5642 * New locales: bho_IN, unm_US, es_CU, ta_LK
5646 * The following bugs are resolved with this release:
5648 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5649 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5650 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5651 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5652 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5653 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5654 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5655 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5656 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5657 12795, 12811, 12813, 12814, 12841
5659 * The RPC implementation in libc is obsoleted. Old programs keep working
5660 but new programs cannot be linked with the routines in libc anymore.
5661 Programs in need of RPC functionality must be linked against TI-RPC.
5662 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5664 Visible changes of this change include (obviously) the inability to link
5665 programs using RPC functions without referencing the TI-RPC library and the
5666 removal of the RPC headers from the glibc headers.
5667 Implemented by Ulrich Drepper.
5669 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5670 syncfs, setns, sendmmsg
5672 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5673 yue_HK, lij_IT, mhr_RU
5675 * New encodings: CP770, CP771, CP772, CP773, CP774
5677 * New program sotruss to trace calls through PLTs
5678 Implemented by Ulrich Drepper.
5680 * The malloc hook implementation is marked deprecated and will be removed
5681 from the default implementation in the next version. The design never
5682 worked ever since the introduction of threads. Even programs which do
5683 not create threads themselves can use multiple threads created internally.
5687 * The following bugs are resolved with this release:
5689 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5690 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5691 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5692 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5695 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5697 * POWER7 optimizations: memset, memcmp, strncmp
5699 * New optimized string functions for x86-64: strnlen (SSE2),
5700 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5701 Implemented by Ulrich Drepper.
5705 * The following bugs are resolved with this release:
5707 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5708 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5709 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5710 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5711 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5712 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5713 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5714 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5716 * New interfaces: pthread_getname_np, pthread_setname_np
5718 * New Linux interface: recvmmsg
5720 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5722 * The dynamic linker now recognizes supported ABI versions from the
5723 EI_ABIVERSION field in the ELF header.
5724 Implemented by Ulrich Drepper.
5726 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5727 will not be used to fill in password fields in the passwd.byname replies.
5728 Instead it is used to synthesize the shadow.byname table, should it be
5729 missing. This is a useful mode in some installations involving Solaris.
5730 Implemented by Ulrich Drepper.
5732 * New locales: kok_IN, sq_MK, cv_RU
5736 * The following bugs are resolved with this release:
5738 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5739 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5740 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5741 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5742 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5743 10789, 10817, 10823, 10840, 10847
5745 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5747 Implemented by Ulrich Drepper.
5749 * Checking version of longjmp added that fails if an uninitialized stack
5750 frame would be created. Implemented by Ulrich Drepper.
5752 * STT_GNU_IFUNC is now supported in static executables.
5753 Implemented by H.J. Lu.
5755 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5757 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5758 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5759 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5760 Contributed by H.J. Lu.
5762 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5763 Implemented by Ulrich Drepper.
5765 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5767 Contributed by H.J. Lu.
5769 * Support for fma instruction in AVX on x86-64.
5770 Implemented by H.J. Lu and Ulrich Drepper.
5772 * AVX support in x86-64 auditing support in ld.so.
5773 Implemented by H.J. Lu.
5775 * STB_GNU_UNIQUE support added.
5776 Implemented by Ulrich Drepper.
5778 * Implement second fallback mode for optimized DNS lookup for even more
5779 broken environments. If two requests from the same port are not
5780 handled correctly close the socket and open a new one before sending
5781 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5782 can be used to select this mode right away, instead of rediscovering the
5783 necessity is every process again.
5784 Implemented by Ulrich Drepper.
5786 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5787 Implemented by Adam Tkac.
5789 * Optimized iconv conversions for S390x.
5790 Implemented by Andreas Krebbel.
5792 * Using condvars with PI mutexes is now more efficient due to kernel
5793 support for requeueing to PI futexes. NPTL support added for x86-64.
5794 Implemented by Ulrich Drepper.
5796 * New locales: ps_AF, my_MM
5800 * The following bugs are resolved with this release:
5802 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5803 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5804 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5805 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5806 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5808 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5809 Implemented by Ulrich Drepper.
5811 * New Linux interfaces: accept4, fallocate, fallocate64.
5812 Implemented by Ulrich Drepper.
5814 * Correct declarations of string function when used in C++ code. This
5815 could lead to compile errors for invalid C++ code.
5817 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5820 * New POSIX 2008 interface: psiginfo
5821 Implemented by Ulrich Drepper.
5823 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5824 Implemented by Ulrich Drepper.
5826 * Support for selecting between multiple function definitions at runtime
5827 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5829 * The libcrypt library can now use the hash function implementations in
5830 NSS. Implemented by Ulrich Drepper.
5832 * The malloc implementation can be compiled to be less memory efficient
5833 but higher performing in multi-threaded programs.
5834 Implemented by Ulrich Drepper.
5836 * New locales: nan_TW@latin, ks_IN
5838 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5839 Implemented by Ulrich Drepper.
5841 * Extended printf hook support. It is possible to use user-defined types
5842 and extend existing format specifiers.
5843 Implemented by Ulrich Drepper.
5845 * Handling for group shadow files has been added.
5846 Implemented by Ulrich Drepper.
5848 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5849 servers (the case, e.g., for some people using the built-in DNS
5850 server in ADSL modems/routers). There is a once-per-process timeout
5851 in case of a broken server. To avoid it, users can run nscd or put
5852 'options single-request' in /etc/resolv.conf.
5853 Implemented by Ulrich Drepper.
5857 * The following bugs are resolved with this release:
5859 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5860 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5861 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5862 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5863 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5865 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5866 up at the same time. Implemented by Ulrich Drepper.
5868 * TLS descriptors for LD and GD on x86 and x86-64.
5869 Implemented by Alexandre Oliva.
5871 * getaddrinfo now handles DCCP and UDPlite.
5872 Implemented by Ulrich Drepper.
5874 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5875 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5876 Implemented by Ulrich Drepper.
5878 * New implementation of memmem, strstr, and strcasestr which is O(n).
5879 Implemented by Eric Blake.
5881 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5883 * Implement "e" option for popen to open file descriptor with the
5884 close-on-exec flag set. Implemented by Ulrich Drepper.
5886 * Implement "b" mode for fmemopen. In this mode writes writes don't
5887 implicitly add a NUL byte and seeks from the end of the buffer really
5888 use the buffer end, not the string length as the basis.
5889 Implemented by Ulrich Drepper.
5891 * Many functions, exported and internal, now atomically set the close-on-exec
5892 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5894 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5896 Implemented by Pravin Satpute.
5898 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5902 * The following bugs are resolved with this release:
5904 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5905 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5906 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5907 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5908 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5909 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5910 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5912 * New locales: bo_CN, bo_IN, shs_CA.
5914 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5916 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5917 Implemented by Pravin Satpute.
5919 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5921 * nscd caches now all timeouts for DNS entries
5922 Implemented by Ulrich Drepper.
5924 * nscd is more efficient and wakes up less often.
5925 Implemented by Ulrich Drepper.
5927 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5928 vdprintf, and obstack_vprintf.
5929 Implemented by Jakub Jelinek.
5931 * Faster memset for x86-64.
5932 Implemented by Harsha Jagasia and H.J. Lu.
5934 * Faster memcpy on x86.
5935 Implemented by Ulrich Drepper.
5937 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5938 Implemented by Ulrich Drepper.
5940 * Faster sqrt and sqrtf implementation for some PPC variants.
5941 Implemented by Steven Munroe.
5945 * The following bugs are resolved with this release:
5947 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5948 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5949 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5950 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5951 5071, 5103, 5104, 5112, 5113, 5184, 5186
5953 * More checking functions: fread, fread_unlocked, open*, mq_open.
5954 Implemented by Jakub Jelinek and Ulrich Drepper.
5956 * Extend fortification to C++. Implemented by Jakub Jelinek.
5958 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5959 by not recognizing 'a' as a modifier when those specs are requested.
5960 Implemented by Jakub Jelinek.
5962 * PPC optimizations to math and string functions.
5963 Implemented by Steven Munroe.
5965 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5966 options to be passed. Implemented by Ulrich Drepper.
5968 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5970 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5971 Implemented by Ulrich Drepper.
5973 * Handle private futexes in the NPTL implementation.
5974 Implemented by Jakub Jelinek and Ulrich Drepper.
5976 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5977 Implemented by Roland McGrath and Ulrich Drepper.
5979 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5981 * SHA-256 and SHA-512 based password encryption.
5982 Implemented by Ulrich Drepper.
5984 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5985 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5988 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5989 Implemented by Ulrich Drepper.
5993 * The following bugs are resolved with this release:
5995 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5996 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5997 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5998 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5999 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
6000 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
6001 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
6004 * New Linux interfaces: epoll_pwait, sched_getcpu.
6006 * New generic interfaces: strerror_l.
6008 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6012 * The following bugs are resolved with this release:
6014 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6015 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6016 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6017 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6018 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6019 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6020 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6021 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6022 3225, 3251, 3252, 3253, 3273
6024 * For Linux, the sorting of addresses returned by getaddrinfo now also
6025 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6026 Implemented by Ulrich Drepper.
6028 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6029 Implemented by Ulrich Drepper.
6031 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6033 * New iconv module for MIK. Contributed by Alexander Shopov.
6035 * For sites with broken group and/or passwd database, the auto-propagate
6036 option of nscd can prevent creating ID lookup entries from the results
6037 of a name lookup and vice versa. This usually is no problem but some
6038 site might have problems with the default behavior.
6039 Implemented by Ulrich Drepper.
6041 * Iterating over entire database in NIS can be slow. With the
6042 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6043 to trade time for memory. The entire database will be read at once.
6044 Implemented by Ulrich Drepper.
6046 * The interfaces introduced in RFC 3542 have been implemented by
6049 * Support for the new ELF hash table format was added by Ulrich Drepper.
6051 * Support for priority inheritance mutexes added by Jakub Jelinek and
6054 * Support for priority protected mutexes added by Jakub Jelinek.
6056 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6057 or_IN, csb_PL, fy_NL, sr_ME.
6061 * More overflow detection functions.
6063 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6064 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6066 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6067 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6068 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6069 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6070 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6071 by Masahide Washizawa.
6073 * It is now possible to install audit libraries for the dynamic linker using
6074 LD_AUDIT. Implemented by Ulrich Drepper.
6076 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6077 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6078 For a libc and libpthread that works well on Linux 2.4 kernels, we
6079 recommend using the stable 2.3 branch.
6081 * The new function open_wmemstream acts like open_memstream,
6082 but uses a wchar_t wide character buffer.
6084 * The new function ppoll is an improved version of poll, similar to pselect.
6086 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6087 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6088 renameat, unlinkat, linkat, symlinkat, readlinkat.
6090 * New Linux kernel system calls: unshare,
6091 inotify_init, inotify_add_watch, inotify_rm_watch.
6093 * The euidaccess function is now also known by the alias eaccess,
6094 for compatibility with some other systems.
6096 * Timezone data updated to 2006b version.
6100 * The following bugs are resolved with this release:
6102 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6103 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6104 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6105 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6106 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6107 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6109 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6111 * As of this release, GCC 4 can be used to compile the C Library.
6113 * Timezone data updated to 2005m version.
6117 * The following bugs are resolved with this release:
6119 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6120 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6121 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6122 777, 787, 821, 822, 823, 825
6124 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6128 * Support for RFC 3678. Real implementations exist only for Linux so far.
6129 Implemented by Ulrich Drepper.
6131 * nscd can now cache entries persistently. Expiring entries are reloaded.
6132 For speedups the cache can be shared in memory with client processes.
6133 Implemented by Ulrich Drepper.
6135 * nscd can now perform SELinux checks.
6136 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6138 * getaddrinfo queries are now cached. Canonical name lookup is performed
6140 Implemented by Ulrich Drepper.
6142 * The nothrow function attribute is used when headers are used by gcc when
6143 compiling C code. This can avoid significant amounts of exception
6146 * The malloc functions perform more error checking and are stricter when
6147 it comes to reacting on errors. The default action is to terminate
6148 the process after showing an error message. Implemented by Ulrich Drepper.
6150 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6151 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6153 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6154 namespaces using the new function dlmopen(). This feature is of course,
6155 like most other dynamic loading functionality, not available in statically
6156 linked applications. Implemented by Ulrich Drepper.
6158 * Low-overhead boundary checking variants of string and some stdio functions
6159 were added. These are to be used in conjunction with a gcc patch by
6160 Jakub Jelinek which adds calls to these functions if possible.
6161 Implemented by Jakub Jelinek and Ulrich Drepper.
6163 * Old code for several operating systems and machine architectures that
6164 have not been in working condition in a long time have been removed from
6165 the main source tree maintained by the GNU C Library's maintainers.
6166 These files are now reside in the separate `ports' source module
6167 that is usable as an add-on when building the library.
6171 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6172 interrogate the dynamic linker, compatible with the Solaris interface.
6174 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6175 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6177 * getifaddrs now uses the netlink interface on Linux to get its information.
6178 Implemented by Thorsten Kukuk.
6180 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6181 Implemented by Ulrich Drepper.
6183 * support for non-executable stacks on x86 has been added. Changes mostly
6186 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6189 * getaddrinfo now performs destination address selection according to
6194 * Thread-safe interfaces for many functions that access locale data
6195 were added in version 2.3, but these features were omitted from NEWS.
6196 Many functions have variants with an `_l' suffix that take a `locale_t'
6197 object as a parameter rather than consulting the current locale.
6198 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6199 create and maintain `locale_t' objects. Additionally, the new function
6200 `uselocale' sets "the current locale" (as used by functions not so
6201 parameterized) set for an individual thread. These features were added
6202 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6204 * The functions getresuid, getresgid, setresuid, and setresgid, which
6205 have long been available on Linux, are now declared in <unistd.h>
6206 and are now also available on the Hurd.
6208 * ELF thread-local storage support (TLS) now works on x86-64.
6210 * The new dynamic string token $LIB is expanded in shared library names.
6211 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6213 * Aldy Hernandez contributed complete software floating point support for
6214 PowerPC machines with no FPU.
6216 * fexecve is implemented on Linux.
6218 * The `btowc' function should work at least twice as fast due to
6219 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6221 * With appropriate thread add-ons cancelable functions are now implemented
6222 in libc.so as well. No need to call the function in libpthread. This
6223 change allowed to finally disable the incorrect and expensive handling
6224 of weak definition in ld.so.
6226 * Yet more PLT entries in libc.so have been removed. We finally arrived
6227 at the bare minimum. Startup times improved appropriately.
6229 * Support for the new Linux/x86 system call interface was added. The
6230 AT_SYSINFO auxiliary vector entry is recognized and handled.
6234 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6237 * iconv (the program and the interface) now accepts empty names (excluding
6238 options like //TRANSLIT) to mean "use charset of current locale".
6240 * localedef can now transliterate characters in strings which are not in
6241 the provided charmap. The information from the input locale is used.
6243 * Prelinking support was added for ELF targets. This requires additional
6244 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6246 * Read-only stdio streams now use mmap to speed up operation by eliminating
6247 copying and buffer underflows. To use add 'm' to the mode string of
6248 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6250 * The malloc functions were completely rewritten by Wolfram Gloger based
6251 on Doug Lea's malloc-2.7.0.c.
6253 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6254 implementation of regex.
6256 * Bruno Haible upgraded the iconv and locale implementation to support
6259 * Contents of the LC_* and LANG environment variables in the CEN style are
6260 not recognized anymore. It never was used. Change by Ulrich Drepper.
6262 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6263 thread-local storage (TLS) ABI on some platforms.
6264 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6266 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6267 EUC-JISX0213, and TSCII.
6269 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6270 BSD-compatible interface for getting all network interface addresses.
6271 Implementation for IPv4 by Roland McGrath.
6273 * Loading of locale data is faster due to the introduction of a locale
6274 archive. Implemented by Roland McGrath and Ulrich Drepper.
6276 * Startup times are significantly reduced by not using exported functions
6277 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6280 * Steven Munroe contributed a port to PowerPC64/Linux.
6284 * The Hurd now uses the GNU libio implementation of stdio rather than the
6285 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6287 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6288 with the same behavior as the Linux system call of the same name.
6292 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6293 128-bit long double format.
6295 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6296 IBM1161, and IBM1162 charsets.
6298 * Andreas Jaeger contributed a port to x86-64/Linux.
6300 * Peter Bruin contributed a port to PowerPC/Hurd.
6302 * libc functions using I/O streams now can handle wide-oriented streams
6305 * optimizations in the dynamic linker. Binaries created by recent binutils
6306 versions start up quicker due to reduced time spent on relocations.
6308 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6312 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6313 asinh, atanh, j0 for the 128-bit long double format.
6315 * Bruno Haible updated all the code handling Unicode in some form to
6316 support Unicode 3.1.
6318 * Speed of regex for single-byte locales is back to previous levels.
6319 Patch by Isamu Hasegawa.
6321 * Alpha, SPARC, and IA-64 now also using floating stacks.
6323 * Startup time of internationalized applications greatly improved through
6324 iconv cache. Use iconvconfig to generate the cache file.
6325 Contributed by Ulrich Drepper.
6327 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6328 severe performance problems. Patch by David Mosberger.
6330 * The Hurd port got a lot more functionality like AIO, various stdio
6331 extensions, etc. Mainly done by Roland McGrath.
6333 * mtrace can now lookup symbols in shared libraries.
6337 * Intel's IA-64 math library is largely integrated. It provides fast and
6338 accurate implementatations for most basic and standard math functions
6339 in float, double, and long double format.
6341 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6342 and asin for the 96-bit long double format and asin, log, tan for the
6343 128-bit long double format.
6345 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6346 The basic double functions exist today. Contributed by Abraham Ziv
6347 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6348 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6350 * An asynchronous name lookup library was added. The interface is designed
6351 after POSIX AIO. The proposal was circulated beforehand to get comments.
6352 No negative ones came in. Implemented by Ulrich Drepper.
6354 * Port to S390/64bit contributed by Martin Schwidefsky
6355 <schwidefsky@de.ibm.com>.
6357 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6358 of functions for Linux/IA-64.
6360 * The RPC code is now thread safe. Threads can now use the same service
6361 of different services at the same time. Patch by Eric Norum
6362 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6364 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6365 family of functions for Linux/S390.
6367 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6368 of functions for Linux/x86.
6370 * Port to Linux/CRIS contributed by Axis Communications.
6374 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6375 we can now check for namespace violations and missing declarations. The
6376 result is that almost all headers are now Unix-compliant (as defined in
6377 the upcoming XPG6). The negative side is that some programs might need
6378 corrections, too, if they depend on the incorrect form of the headers in
6379 previous versions which defined too many symbols and included too many
6382 * regex now handles multibyte character sets correctly.
6383 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6385 * iconv (the program) does now conform to the upcoming XPG6 and handles
6386 charmaps. Instead of the charset names the path of charmaps can be
6387 provided and the conversion happens based on this data.
6388 Contributed by Ulrich Drepper.
6390 * The locale program now provides detailed information about the installed
6395 only lists the names of the supported locales
6399 provides details such as country, language, and codeset name.
6400 Contributed by Ulrich Drepper.
6404 * The gencat program now parses the input file according to the charset
6405 selected by the LC_CTYPE category. This is important for stateful
6406 character sets. To make generating catalogs easier there is a way
6407 to overwrite the charset selected by the locale: before the first
6408 message or $ quote line the catalog can contain a line like
6410 $ codeset=ISO-8859-2
6412 to select the charset (ISO-8859-2 in this case).
6414 Implemented by Shinya Hanataka and Ulrich Drepper.
6416 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6417 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6418 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6420 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6421 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6423 * The LANGUAGE environment variable is now ignored unless the locale is
6424 changed from the default "C" locale.
6426 * The usual bug fixes.
6430 * Greg McGary added runtime support for bounds checking using gcc's
6431 new -fbounded-pointers option. ix86 target is complete. PowerPC
6434 * Thorsten Kukuk added secure mode support to nscd.
6436 * The Berkeley db libraries have been removed.
6438 Related, the nss_db module is now in a separate package since it
6439 obviously requires a database library being available.
6441 * Wide character I/O streams implemented by Ulrich Drepper.
6443 * Functions from the extended socket API added by Ulrich Drepper.
6445 * Functions feenableexcept and fedisableexcept to control the
6446 behaviour of individual exceptions have been added by Andreas Jaeger.
6448 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6450 * The resolver code has been updated from bind 8.2.3-T5B which supports
6451 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6454 This change could in some situations effect backward compatibility. Since
6455 now `_res' is a thread-local instead of a global variable, modifying it
6456 in one thread does not have any effect in other threads.
6458 The resolver library was also extended to allow IPv6 as the transport
6459 protocol for the requests. This work was done by Stig Venaas.
6461 * Compatibility code for K&R C compilers has been removed from the
6462 header files. A ISO C compiler is needed to use the library
6463 (conforming to either C89 or C99 standard).
6465 * Complete rewrite of the localedef program to support multibyte character
6466 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6467 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6468 Implemented by Ulrich Drepper.
6470 Bruno Haible significantly improved the generation and use of the data
6471 structures for the wide character tables.
6473 * Plural handling in gettext implemented by Ulrich Drepper.
6475 * The utmp daemon has been removed.
6477 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6479 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6482 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6484 * POSIX barriers implemented by Kaz Kylheku.
6486 * POSIX spawn function family implemented by Ulrich Drepper.
6488 * POSIX spinlocks are now available.
6490 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6492 * the configure option --enable-kernel=X.Y.Z allows to strip out
6493 compatibility for kernel versions before X.Y.Z. This is currently only
6494 implemented for Linux.
6496 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6497 field sin6_scope_id. This means that all programs using IPv6 should be
6498 recompiled. Don't expect binary compatibility with previous glibc
6501 * various conversion modules for IBM character sets contributed by
6504 * IA-64 port by Jes Sorensen and HJ Lu.
6518 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6520 * New xdr functions are added; some rpc functions are now 64bit clean.
6522 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6524 * Fixed known incompatibilities with glibc 2.0.
6526 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6528 * Optimized a number of functions (especially the ELF dynamic loader).
6530 * Update timezone data files.
6532 * lots of charmaps corrections
6534 * some new locale definitions and charmaps
6539 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6540 conform to POSIX member type requirements. Symbol versions have been
6541 adjusted as needed within the library, and for direct use by applications,
6542 but there is potential for problems if third-party libraries use
6543 struct timeval as part of their interface. This does not present
6544 a problem for X and other "essential" system libraries.
6546 * An additional locale model to support C++ Standard Library locale
6547 model and probably more was implemented by Ulrich Drepper.
6549 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6552 * Miles Bader provided the `argp' function family to support hierarchical
6553 command line argument parsing, layered on top of getopt.
6555 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6557 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6560 * scanf recognizes the %a and %A format for scanning floating point numbers.
6562 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6563 information and interfaces for the available integer types.
6565 * about 130 new math functions were added to implement the ISO C9x math
6568 * the new header <complex.h> contains definitions of the complex math
6569 functions from ISO C 9X.
6571 * the new header <tgmath.h> defines generic macros to use complex or
6572 real valued functions.
6574 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6576 * Andreas Jaeger provided a test suite for the math library.
6578 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6580 * Ulrich Drepper added character set conversion functions (iconv).
6582 * Optimized string functions have been added.
6584 * The localedata addon is now part of glibc.
6586 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6588 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6589 daemon for NSS (nscd).
6591 Missing a better place here are some numbers on improvements. Under
6592 Linux 2.1.125 un-tar-ing the kernel sources takes
6596 using local files 12.19s 6.88s 22.91s
6598 using NIS 13.92s 8.91s 26.34s
6600 using NIS & nscd 10.37s 7.34s 25.30s
6602 using NIS+ 27.57s 30.37s 640.46s
6604 using NIS+ & nscd 10.25s 7.83s 26.51s
6606 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6608 Keep in mind that non-namelookup related operations dominate above times.
6609 It was just a common complain that using NIS+ unpacking the kernel is
6612 [1] The old nscd implementation is not available anymore since it was
6613 distributed with glibc up to version 2.0.98 and thus is now replaced.
6615 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6617 * Mark Kettenis provided a Hesiod NSS module.
6619 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6620 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6622 * rcmd can now handle netgroups (Dick Streefland).
6624 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6627 * Support for the IPv6 protocol has been added to the socket API, as per the
6628 latest draft standards.
6630 * Support for Linux 2.2 has been added.
6632 * Interface changes relative to the latest 2.0.x release:
6633 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6634 addseverity NEW: Unix98
6635 alphasort64 NEW: LFS
6636 argp_err_exit_status NEW: argp, GNU ext
6637 argp_error NEW: argp, GNU ext
6638 argp_failure NEW: argp, GNU ext
6639 argp_help NEW: argp, GNU ext
6640 argp_parse NEW: argp, GNU ext
6641 argp_program_bug_address NEW: argp, GNU ext
6642 argp_program_version NEW: argp, GNU ext
6643 argp_program_version_hook NEW: argp, GNU ext
6644 argp_state_help NEW: argp, GNU ext
6645 argp_usage NEW: argp, GNU ext
6646 authdes_create NEW: Secure RPC
6647 authdes_getucred NEW: Secure RPC
6648 authdes_pk_create NEW: Secure RPC
6649 backtrace NEW: GNU ext.
6650 backtrace_symbols NEW: GNU ext.
6651 backtrace_symbols_fd NEW: GNU ext.
6653 cacosf NEW: ISO C 9x
6654 cacosh NEW: ISO C 9x
6655 cacoshf NEW: ISO C 9x
6656 cacoshl NEW: ISO C 9x
6657 cacosl NEW: ISO C 9x
6664 casinf NEW: ISO C 9x
6665 casinh NEW: ISO C 9x
6666 casinhf NEW: ISO C 9x
6667 casinhl NEW: ISO C 9x
6668 casinl NEW: ISO C 9x
6670 catanf NEW: ISO C 9x
6671 catanh NEW: ISO C 9x
6672 catanhf NEW: ISO C 9x
6673 catanhl NEW: ISO C 9x
6674 catanl NEW: ISO C 9x
6675 cbc_crypt NEW: Secure RPC
6679 ccoshf NEW: ISO C 9x
6680 ccoshl NEW: ISO C 9x
6686 cimagf NEW: ISO C 9x
6687 cimagl NEW: ISO C 9x
6688 clearerr_locked REMOVED
6689 clntunix_create NEW: sunrpc ext
6691 clog10 NEW: ISO C 9x
6692 clog10f NEW: ISO C 9x
6693 clog10l NEW: ISO C 9x
6703 cprojf NEW: ISO C 9x
6704 cprojl NEW: ISO C 9x
6706 crealf NEW: ISO C 9x
6707 creall NEW: ISO C 9x
6712 csinhf NEW: ISO C 9x
6713 csinhl NEW: ISO C 9x
6716 csqrtf NEW: ISO C 9x
6717 csqrtl NEW: ISO C 9x
6721 ctanhf NEW: ISO C 9x
6722 ctanhl NEW: ISO C 9x
6724 des_setparity NEW: Secure RPC
6725 ecb_crypt NEW: Secure RPC
6726 endutxent NEW: Unix98
6728 exp10f NEW: ISO C 9x
6729 exp10l NEW: ISO C 9x
6733 fattach NEW: STREAMS
6734 fdetach NEW: STREAMS
6738 feclearexcept NEW: ISO C 9x
6739 fegetenv NEW: ISO C 9x
6740 fegetexceptflag NEW: ISO C 9x
6741 fegetround NEW: ISO C 9x
6742 feholdexcept NEW: ISO C 9x
6744 feraiseexcept NEW: ISO C 9x
6745 ferror_locked REMOVED
6746 fesetenv NEW: ISO C 9x
6747 fesetexceptflag NEW: ISO C 9x
6748 fesetround NEW: ISO C 9x
6749 fetestexcept NEW: ISO C 9x
6750 feupdateenv NEW: ISO C 9x
6751 fflush_locked REMOVED
6755 fgets_unlocked NEW: GNU ext.
6756 fileno_locked REMOVED
6768 fputc_locked REMOVED
6769 fputs_unlocked NEW: GNU ext.
6770 fread_unlocked NEW: GNU ext.
6775 fstatvfs NEW: Unix98
6779 ftruncate64 NEW: LFS
6781 fwrite_unlocked NEW: GNU ext.
6782 gai_strerror NEW: IPv6
6786 getchar_locked REMOVED
6788 getdate_err NEW: Unix98
6789 getdate_r NEW: GNU ext.
6791 getnameinfo NEW: IPv6
6792 getnetname NEW: Secure RPC
6793 getpmsg NEW: STREAMS
6794 getpt NEW: Unix98 PTY
6795 getrlimit64 NEW: LFS
6796 getutxent NEW: Unix98
6797 getutxid NEW: Unix98
6798 getutxline NEW: Unix98
6799 glob64 NEW: GNU ext.
6800 globfree64 NEW: GNU ext.
6801 gnu_get_libc_release NEW: GNU ext.
6802 gnu_get_libc_version NEW: GNU ext.
6803 grantpt NEW: Unix98 PTY
6804 host2netname NEW: Secure RPC
6806 iconv_close NEW: iconv
6807 iconv_open NEW: iconv
6808 if_freenameindex NEW: IPv6
6809 if_indextoname NEW: IPv6
6810 if_nameindex NEW: IPv6
6811 if_nametoindex NEW: IPv6
6812 in6addr_any NEW: IPv6
6813 in6addr_loopback NEW: IPv6
6814 inet6_isipv4mapped NEW: IPv6
6815 isastream NEW: STREAMS
6816 iswblank NEW: GNU ext.
6817 key_decryptsession NEW: Secure RPC
6818 key_decryptsession_pk NEW: Secure RPC
6819 key_encryptsession NEW: Secure RPC
6820 key_encryptsession_pk NEW: Secure RPC
6821 key_gendes NEW: Secure RPC
6822 key_get_conv NEW: Secure RPC
6823 key_secretkey_is_set NEW: Secure RPC
6824 key_setnet NEW: Secure RPC
6825 key_setsecret NEW: Secure RPC
6826 llrint NEW: ISO C 9x
6827 llrintf NEW: ISO C 9x
6828 llrintl NEW: ISO C 9x
6829 llround NEW: ISO C 9x
6830 llroundf NEW: ISO C 9x
6831 llroundl NEW: ISO C 9x
6836 lrintf NEW: ISO C 9x
6837 lrintl NEW: ISO C 9x
6838 lround NEW: ISO C 9x
6839 lroundf NEW: ISO C 9x
6840 lroundl NEW: ISO C 9x
6842 makecontext NEW: Unix98
6843 mempcpy NEW: GNU ext.
6846 modify_ldt NEW: kernel
6850 nearbyint NEW: ISO C 9x
6851 nearbyintf NEW: ISO C 9x
6852 nearbyintl NEW: ISO C 9x
6853 netname2host NEW: Secure RPC
6854 netname2user NEW: Secure RPC
6855 nexttoward NEW: ISO C 9x
6856 nexttowardf NEW: ISO C 9x
6857 nexttowardl NEW: ISO C 9x
6861 passwd2des NEW: Secure RPC
6863 pow10f NEW: GNU ext.
6864 pow10l NEW: GNU ext.
6867 printf_size NEW: GNU ext.
6868 printf_size_info NEW: GNU ext.
6869 profil_counter REMOVED
6870 pthread_mutexattr_getkind_np REPLACED
6871 pthread_mutexattr_setkind_np REPLACED
6872 ptsname NEW: Unix98 PTY
6873 ptsname_r NEW: Unix98 PTY
6875 putchar_locked REMOVED
6876 putgrent NEW: GNU ext.
6878 putpmsg NEW: STREAMS
6879 pututxline NEW: Unix98
6883 readdir64_r NEW: LFS
6884 remquo NEW: ISO C 9x
6885 remquof NEW: ISO C 9x
6886 remquol NEW: ISO C 9x
6888 roundf NEW: ISO C 9x
6889 roundl NEW: ISO C 9x
6891 scalbln NEW: ISO C 9x
6892 scalblnf NEW: ISO C 9x
6893 scalblnl NEW: ISO C 9x
6895 sendfile NEW: kernel
6896 setcontext NEW: Unix98
6897 setrlimit64 NEW: LFS
6898 setutxent NEW: Unix98
6900 sigignore NEW: Unix98
6901 sigqueue NEW: POSIX.1b
6902 sigrelse NEW: Unix98
6903 sigset NEW: POSIX.1b
6904 sigtimedwait NEW: POSIX.1b
6905 sigwaitinfo NEW: POSIX.1b
6906 sincos NEW: GNU ext.
6907 sincosf NEW: GNU ext.
6908 sincosl NEW: GNU ext.
6912 strcasestr NEW: GNU ext.
6913 strtoimax NEW: ISO C 9x
6914 strtoumax NEW: ISO C 9x
6915 strverscmp NEW: GNU ext.
6916 svcauthdes_stats NEW: Secure RPC
6917 svcunix_create NEW: sunrpc etx
6918 svcunixfd_create NEW: sunrpc ext
6919 swapcontext NEW: Unix98
6920 tcgetsid NEW: Unix98 PTY
6921 tdestroy NEW: GNU ext.
6922 tgamma NEW: ISO C 9x
6923 tgammaf NEW: ISO C 9x
6924 tgammal NEW: ISO C 9x
6928 truncf NEW: ISO C 9x
6929 truncl NEW: ISO C 9x
6931 unlockpt NEW: Unix98 PTY
6932 updwtmpx NEW: Unix98
6933 user2netname NEW: Secure RPC
6934 utmpxname NEW: Unix98
6935 versionsort NEW: GNU ext.
6936 versionsort64 NEW: GNU ext.
6938 wcscasecmp NEW: GNU ext.
6939 wcsncasecmp NEW: GNU ext.
6940 wcsnlen NEW: GNU ext.
6941 wcstoimax NEW: ISO C 9x
6942 wcstoll NEW: ISO C 9x
6943 wcstoull NEW: ISO C 9x
6944 wcstoumax NEW: ISO C 9x
6946 wordexp NEW: POSIX.2
6947 wordfree NEW: POSIX.2
6948 write_profiling REMOVED
6949 xdecrypt NEW: Secure RPC
6950 xdr_authdes_cred NEW: Secure RPC
6951 xdr_authdes_verf NEW: Secure RPC
6952 xdr_cryptkeyarg NEW: Secure RPC
6953 xdr_cryptkeyarg2 NEW: Secure RPC
6954 xdr_cryptkeyres NEW: Secure RPC
6955 xdr_getcredres NEW: Secure RPC
6956 xdr_key_netstarg NEW: Secure RPC
6957 xdr_key_netstres NEW: Secure RPC
6958 xdr_keybuf NEW: Secure RPC
6959 xdr_keystatus NEW: Secure RPC
6960 xdr_netnamestr NEW: Secure RPC
6961 xdr_sizeof NEW: Secure RPC
6962 xdr_unixcred NEW: sunrpc ext
6963 xencrypt NEW: Secure RPC
6964 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6975 * inet_ntoa is thread-safe
6977 * updwtmp is moved from libutil to libc
6979 * rewrite of cbrt function
6981 * update of timezone data
6995 * add atoll function
6997 * fix complex problems in Berkeley DB code
6999 * fix math functions
7003 * fixed lots of header problems (especially Linux/GNU specific)
7005 * dynamic loader preserves all registers
7007 * Roland McGrath provided support for handling of auxiliary objects in
7008 the ELF dynamic loader.
7010 * support for parallel builds is improved
7014 * GNU extensions are no longer declared by default. To enable them you
7015 must define the macro `_GNU_SOURCE' in your program or compile with
7018 * The library has changed from using GNU ld symbol aliases to using weak
7019 symbols where available. The ELF object file format supports weak
7020 symbols; GNU ld also supports weak symbols in the a.out format. (There
7021 is also now support for other GNU ld extensions in ELF. Use the
7022 `--with-elf' option to configure to indicate you have ELF, and
7023 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7024 of many files which contained only symbol aliases, reducing the size of
7025 the source and the compiled library; many other files were renamed to
7026 less cryptic names previously occupied by the symbol alias files.
7027 There is a new header file <elf.h> for programs which operate on
7028 files in the ELF format.
7030 * Converted to Autoconf version 2, so `configure' has more options.
7031 Run `configure --help' to see the details.
7033 * The library can now be configured to build profiling, highly-optimized
7034 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7035 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7036 `configure' enable building these extra libraries. The shared library is
7037 built by default when using both ELF and GNU ld. When shared libraries
7038 are enabled, the new library `-ldl' is available for arbitrary run-time
7039 loading of shared objects; its interface is defined in <dlfcn.h>. The
7040 new header file <link.h> gives access to the internals of the run-time
7041 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7042 application of same name on other systems and it provides information
7043 about dynamically linked binaries.
7045 * The C library now provides the run-time support code for profiling
7046 executables compiled with `-pg'. Programs can control the profiling code
7047 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7048 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7049 the support for this file format was contributed by David Mosberger-Tang.
7051 * The math code has been replaced with a math library based on fdlibm from
7052 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7053 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7054 functions. The math functions now reside in a separate library, so
7055 programs using them will need to use `-lm' their linking commands.
7057 * John C. Bowman contributed optimized ix87 assembler inline functions.
7059 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7060 mechanism similar to that found in Solaris 2. This is now used for the
7061 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7062 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7063 file controls what services are used for each individual database. This
7064 works by loading shared libraries with names specified in `nsswitch.conf',
7065 so service modules can be changed or added at any time without even
7066 relinking any program. Currently there are the file, db, and NIS based
7067 NSS services available.
7069 * The new functions `strtoq' and `strtouq' parse integer values from
7070 strings, like `strtol' and `strtoul', but they return `long long int' and
7071 `unsigned long long int' values, respectively (64-bit quantities).
7073 * The new functions `strtof' and `strtold' parse floating-point values from
7074 strings, like `strtod', but they return `float' and `long double' values,
7075 respectively (on some machines `double' and `long double' are the same).
7077 * Ulrich Drepper has contributed new implementations of the floating-point
7078 printing and reading code used in the `printf' family of functions and
7079 `strtod', `strtof', and `strtold'. These new functions are perfectly
7080 accurate, and much faster than the old ones.
7082 * The implementation of the POSIX locale model was completely rewritten by
7083 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7084 to compile the POSIX locale definition.
7086 * The former dummy implementations of the strcoll and strxfrm function are
7087 now replaced by fully functional code contributed by Ulrich Drepper. The
7088 collation information comes from the POSIX locale definitions.
7090 * The new header <langinfo.h> defines an interface for accessing
7091 various locale-dependent data (using the locale chosen with `setlocale').
7093 * Ulrich Drepper has contributed a new suite of functions for operation on
7094 wide-character and multibyte-character strings, in <wchar.h>;
7095 and classification and case conversion of wide characters, in <wctype.h>.
7096 These new functions are conforming to the ISO C, Amendment 1 specification.
7098 * There is now a second implementation of the standard I/O library available.
7099 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7100 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7102 * You can now use positional parameter specifications in format strings
7103 for the `printf' and `scanf' families of functions. For example,
7104 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7105 ``Number 6, Mr Jones''. This is mainly useful when providing different
7106 format strings for different languages, whose grammars may dictate
7107 different orderings of the values being printed. To support this
7108 feature, the interface for `register_printf_handler' has changed; see
7109 the header file <printf.h> for details.
7111 * The `printf' and `scanf' families of functions now understand a new
7112 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7113 to group numbers as indicated by the locale; for `scanf' and friends, this
7114 says to accept as valid only a number with all the proper grouping
7115 separators in the right places. In the default "C" locale, numbers are
7116 not grouped; but locales for specific countries will define the usual
7117 conventions (i.e. separate thousands with `,' in the US locale).
7119 * The pgrp functions have been regularized, slightly incompatibly but much
7120 less confusingly. The core functions are now `getpgid' and `setpgid',
7121 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7122 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7123 provided for compatibility. There is no longer an incompatible `getpgrp'
7124 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7126 * The new header file <fts.h> and suite of functions simplify programs that
7127 operate on directory trees. This code comes from 4.4 BSD.
7129 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7130 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7131 NSS scheme used in glibc.
7133 * There is a new malloc debugging hook `__memalign_hook'.
7135 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7136 `unsigned int' in <sys/types.h>. These are for compatibility only and
7137 their use is discouraged.
7139 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7140 done differently, so that it works even without GNU ld.
7142 * New function `euidaccess' checks allowed access to a file like `access',
7143 but using the effective IDs instead of the real IDs.
7145 * The time zone data files have been updated for the latest and greatest
7146 local time conventions of the countries of the world.
7148 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7151 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7152 for formatting floating-point numbers. They are provided only for
7153 compatibility; new programs should use `sprintf' instead. There are
7154 also equivalent function for the `long double' floating-point type and
7155 all functions also exist in a reentrant form.
7157 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7158 functions for maintaining the login-record files (primarily of use to
7159 system programs such as `login'), and convenient functions for
7160 allocating and initializing a pseudo-terminal (pty) device.
7162 * Ulrich Drepper has contributed new support for System V style
7163 shared memory and IPC on systems that support it.
7165 * Ulrich Drepper has contributed several miscellaneous new functions found
7166 in System V: The `hsearch' family of functions provide an effective
7167 implementation of hash tables; `a64l' and `l64a' provide a very simple
7168 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7171 * Ulrich Drepper has contributed new reentrant counterparts for the
7172 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7174 * Ulrich Drepper has contributed new, highly-optimized versions of several
7175 string functions for the i486/Pentium family of processors.
7177 * Ulrich Drepper has updated the Linux-specific code, based largely
7178 on work done in Hongjiu Lu's version of GNU libc for Linux.
7179 The GNU library now supports Linux versions 2.0.10 and later,
7180 using the ELF object file format (i[3456]86-*-linux).
7182 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7184 * David Mosberger-Tang and Richard Henderson have ported the C library
7185 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7186 dynamic linking support for ELF/Alpha.
7188 * Richard Henderson contributed several Alpha optimized assembler function
7189 for arithmetic and string handling.
7191 * Ulrich Drepper has contributed a new set of message catalog functions to
7192 support multiple languages using the <libintl.h> interface, for use with
7193 his new package GNU gettext. Translation volunteers have contributed
7194 catalogs of the library's messages in Spanish, German, and Korean.
7196 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7197 program and the `catgets' function for reading the catalog files it
7198 creates. (The <libintl.h> interface is preferred; we include the
7199 <nl_types.h> interface using `catgets' only for source compatibility with
7200 programs already written to use it.)
7202 * New header file <values.h> gives SVID-compatible names for <limits.h>
7205 * Various new macros, declarations, and small header files for compatibility
7208 * New function `group_member' is a convenient way to check if a process has
7209 a given effective group ID.
7211 * When using GCC 2.7 and later, the socket functions are now declared in a
7212 special way so that passing an argument of type `struct sockaddr_in *',
7213 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7214 `struct sockaddr *' type, does not generate a type-clash warning.
7216 * New function `error' declared in header file <error.h> is a convenient
7217 function for printing error messages and optionally exiting; this is the
7218 canonical function used in GNU programs. The new functions `err', `warn',
7219 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7220 doing the same thing.
7222 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7223 POSIX.2 `glob' function to do ~ and {...} expansion.
7225 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7226 `clearenv' which is used in POSIX.9 is also available.
7228 * New function `getsid' returns session ID number on systems that support it.
7230 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7231 files <db.h> and <mpool.h> provide a rich set of functions for several
7232 types of simple databases stored in memory and in files, and <ndbm.h> is
7233 an old `ndbm'-compatible interface using the `db' functions. Link with
7234 `-ldb' to get these functions.
7236 * New macro `strdupa' copies a string like `strdup', but uses local stack
7237 space from `alloca' instead of dynamic heap space from `malloc'.
7239 * New function `strnlen' is like `strlen' but searches only a given maximum
7240 number of characters for the null terminator. `stpncpy', `strndup' and
7241 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7244 * New function `statfs' in header <sys/statfs.h>.
7246 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7247 provide convenient functions for operating on blocks of null-terminated
7250 * A new suite of functions in <utmp.h> handle all the details of reading
7251 and writing the utmp file.
7253 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7256 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7257 completely POSIX compliant and also implemented the extended functionality
7258 to handle alternate digit representation and alternate era date formats.
7260 * Ulrich Drepper provided an implementation of the `strptime' function
7261 defined in XPG4.2 which transforms a string into a `struct tm' value.
7263 * Paul Eggert provided the tzselect shell script as part of the timezone
7264 code. The shell script makes it easy to select the correct timezone
7267 * The implementation of the malloc family of functions is completely replaced
7268 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7269 The implementation uses the mmap function (if available) and it is
7270 optimized for the use in multi threaded programs.
7272 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7273 functions. This new functionality is usable by specifying a special
7274 salt string and it is compatible with implementation on *BSD systems.
7276 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7277 `getsubopt' to handle second level command line options, `bsd_signal'
7278 to access BSD style `signal' functionality, the obsolete `regexp' style
7281 * the `lchown' function is available on system which support this
7284 * The implementation of the shadow password handling function was contributed
7287 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7289 * POSIX.1g support was added. The <sys/select.h> header is available,
7290 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7291 implementation of `getaddrinfo'.
7295 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7297 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7298 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7300 * The new function `daemon' from 4.4 BSD is useful for server programs that
7301 want to put themselves in the background.
7303 * Joel Sherrill has contributed support for several standalone boards that
7304 run without an operating system.
7306 * `printf', `scanf' and friends now accept a `q' type modifier for long
7307 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7309 * All of the code taken from BSD (notably most of the math and networking
7310 routines) has been updated from the BSD 4.4-Lite release.
7312 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7314 * The new functions `getdomainname' and `setdomainname' fetch or change the
7315 YP/NIS domain name. These are system calls which exist on systems which
7318 * The time zone data files have been updated for the latest international
7321 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7322 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7326 * The C library now includes support for Sun RPC, from Sun's free
7327 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7328 are included. (There is still no support for YP.)
7330 * Tom Quinn has contributed a port of the C library to SGI machines running
7331 Irix 4 (mips-sgi-irix4).
7333 * The new `lockf' function is a simplified interface to the locking
7334 facilities of `fcntl', included for compatibility.
7336 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7338 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7340 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7343 * The error message printed by `assert' for a failed assertion now includes
7344 the name of the program (if using GNU ld) and the name of the calling
7345 function (with versions of GCC that support this).
7347 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7349 * The library now includes the <sys/mman.h> header file and memory
7350 management functions `mmap', `munmap', `mprotect', `msync', and
7351 `madvise', on systems that support those facilities.
7353 * The interface for `mcheck' has changed slightly: the function called to
7354 abort the program when an allocation inconsistency is detected now takes
7355 an argument that indicates the type of failure. The new function
7356 `mprobe' lets you request a consistency check for a particular block at
7357 any time (checks are normally done only when you call `free' or `realloc'
7360 * It is now possible to easily cross-compile the C library, building on one
7361 system a library to run on another machine and/or operating system. All
7362 you need to do is set the variable `HOST_CC' in `configparms' to the
7363 native compiler for programs to run on the machine you are building on (a
7364 few generator programs are used on Unix systems); set `CC' to the
7367 * The new function `fexecve' (only implemented on the GNU system) executes
7368 a program file given a file descriptor already open on the file.
7372 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7373 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7375 * You can set the variable `libprefix' in `configparms' to specify a prefix
7376 to be prepended to installed library files; this makes it easy to install
7377 the GNU C library to be linked as `-lgnuc' or whatever.
7379 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7380 copies a limited number of characters from a string, and returns the
7381 address of the last character written.
7383 * You no longer need to check for whether the installed `stddef.h' is
7384 compatible with the GNU C library. configure now checks for you.
7386 * You can now define a per-stream `fileno' function to convert the
7387 stream's cookie into an integral file descriptor.
7389 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7390 allocates zero bytes of storage, and returns a unique pointer which
7391 you can pass to `realloc' or `free'. The behavior is undefined if
7392 you dereference this pointer.
7394 * The C library now runs on Sony NEWS m68k machines running either
7395 NewsOS 3 or NewsOS 4.
7397 * The new `syscall' function is a system-dependent primitive function
7398 for invoking system calls. It has the canonical behavior on Unix
7399 systems, including unreliable return values for some calls (such as
7400 `pipe', `fork' and `getppid').
7402 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7403 to `EAGAIN', which is the preferred name. On systems whose kernels
7404 use two distinct codes, the C library now translates EWOULDBLOCK to
7405 EAGAIN in every system call function.
7409 * The GNU C Library Reference Manual is now distributed with the library.
7410 `make dvi' will produce a DVI file of the printed manual.
7411 `make info' will produce Info files that you can read on line using C-h i
7412 in Emacs or the `info' program.
7413 Please send comments on the manual to bug-glibc-manual@gnu.org.
7415 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7417 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7419 * Jason Merrill has contributed a port to the Sequent Symmetry running
7420 Dynix version 3 (i386-sequent-dynix).
7422 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7423 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7425 * New function `memory_warnings' lets you arrange to get warnings when
7426 malloc is running out of memory to allocate, like Emacs gives you.
7428 * The C library now contains the relocating allocator used in Emacs 19 for
7429 its editing buffers. This allocator (ralloc) minimizes allocation
7430 overhead and fragmentation by moving allocated regions around whenever it
7431 needs to. You always refer to a ralloc'd region with a "handle" (a
7432 pointer to a pointer--an object of type `void **').
7434 * There is a new `printf' format: `%m' gives you the string corresponding
7435 to the error code in `errno'.
7437 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7438 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7439 pass, the `a' modifier says to fill in a `char **' you pass with a
7442 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7443 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7444 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7446 * `mkstemp' is a traditional Unix function to atomically create and open a
7447 uniquely-named temporary file.
7451 * The standard location for the file that says what the local timezone is
7452 has changed again. It is now `/usr/local/etc/localtime' (or more
7453 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7455 * The distribution no longer contains any files with names longer than 14
7458 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7459 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7461 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7465 * The configuration process has changed quite a bit. The `configure'
7466 script is now used just like the configuration scripts for other GNU
7467 packages. The `sysdeps' directory hierarchy is much rearranged.
7468 The file `INSTALL' explains the new scheme in detail.
7470 * The header files no longer need to be processed into ANSI C and
7471 traditional C versions. There is just one set of files to install, and
7472 it will work with ANSI or old C compilers (including `gcc -traditional').
7474 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7475 MIPS DECStation running Ultrix 4.
7477 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7478 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7479 made itself into a shared library.
7481 * Yet further improved support for the i386, running 4.3 BSD-like systems
7482 (such as Mach 3 with the Unix single-server), or System V.
7484 * New function `strncasecmp' to do case-insensitive string comparison
7485 with limited length.
7487 * New function `strsep' is a reentrant alternative to `strtok'.
7489 * New functions `scandir' and `alphasort' for searching directories.
7491 * New function `setenv' is a better interface to `putenv'.
7493 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7494 function for traversing a directory tree.
7496 * The GNU obstack package is now also part of the C library.
7497 The new function `open_obstack_stream' creates a stdio stream that
7498 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7499 formatted output directly to an obstack.
7501 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7502 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7504 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7506 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7507 things to your strings.
7509 * There are some new test programs: test-fseek, testmb, and testrand.
7511 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7512 These ports are not finished, but are a good starting place for really
7513 supporting those systems.
7515 * `/etc/localtime' is now the standard location for the file that says what
7516 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7517 This follows the general principle that `/etc' is the place for all local
7518 configuration files.
7520 * The C library header files now use `extern "C"' when used by the C++
7521 compiler, so the C library should now work with C++ code.
7523 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7524 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7527 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7528 function which uses the `merge sort' algorithm, and is said to be
7529 significantly faster than the old GNU `qsort' function. Merge sort is
7530 now the standard `qsort' function. The new algorithm can require a lot
7531 of temporary storage; so, the old sorting function is called when the
7532 required storage is not available.
7534 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7535 provides the Unix `crypt' function, plus some other entry points.
7537 * The code and header files taken from 4.4 BSD have been updated with the
7538 latest files released from Berkeley.
7540 ----------------------------------------------------------------------
7543 Permission is granted to anyone to make or distribute verbatim copies
7544 of this document as received, in any medium, provided that the
7545 copyright notice and this permission notice are preserved,
7546 thus giving the recipient permission to redistribute in turn.
7548 Permission is granted to distribute modified versions
7549 of this document, or of portions of it,
7550 under the above conditions, provided also that they
7551 carry prominent notices stating who last changed them.
7554 version-control: never