1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2024 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Sync with Linux kernel 6.6 shadow stack interface. Since only x86-64
13 is supported, --enable-cet is ignored for i386.
15 * struct statvfs now has an f_type member, equal to the f_type statfs member;
16 on the Hurd this was always available under a reserved name,
17 and under Linux a spare has been allocated: it was always zero
18 in previous versions of glibc, and zero is not a valid result.
20 * On Linux, the functions posix_spawnattr_getcgroup_np and
21 posix_spawnattr_setcgroup_np have been added, along with the
22 POSIX_SPAWN_SETCGROUP flag. They allow posix_spawn and posix_spawnp
23 to set the cgroupv2 in the new process in a race-free manner. These
24 functions are GNU extensions and require a kernel with clone3 support.
26 * On Linux, the pidfd_spawn and pidfd_spawp functions have been added.
27 They have a similar prototype and semantic as posix_spawn, but instead of
28 returning a process ID, they return a file descriptor that can be used
29 along other pidfd functions (like pidfd_send_signal, poll, or waitid).
30 The pidfd functionality avoids the issue of PID reuse with the traditional
31 posix_spawn interface.
33 * On Linux, the pidfd_getpid function has been added. It allows retrieving
34 the process ID associated with the process file descriptor created by
35 pid_spawn, fork_np, or pidfd_open.
37 * scanf-family functions now support the wN format length modifiers for
38 arguments pointing to types intN_t, int_leastN_t, uintN_t or
39 uint_leastN_t (for example, %w32d to read int32_t or int_least32_t in
40 decimal, or %w32x to read uint32_t or uint_least32_t in hexadecimal)
41 and the wfN format length modifiers for arguments pointing to types
42 int_fastN_t or uint_fastN_t, as specified in draft ISO C2X.
44 * A new tunable, glibc.mem.decorate_maps, can be used to add additional
45 information on underlying memory allocated by the glibc (for instance,
46 on thread stack created by pthread_create or memory allocated by
49 * The <stdbit.h> header has been added from ISO C2X, with
50 stdc_leading_zeros, stdc_leading_ones, stdc_trailing_zeros,
51 stdc_trailing_ones, stdc_first_leading_zero, stdc_first_leading_one,
52 stdc_first_trailing_zero, stdc_first_trailing_one, stdc_count_zeros,
53 stdc_count_ones, stdc_has_single_bit, stdc_bit_width, stdc_bit_floor
54 and stdc_bit_ceil function families, each having functions for
55 unsigned char, unsigned short, unsigned int, unsigned long int and
56 unsigned long long int, and a type-generic macro.
58 Deprecated and removed features, and other changes affecting compatibility:
60 * The ldconfig program now skips file names containing ';' or ending in
61 ".tmp", to avoid examining temporary files created by the RPM and dpkg
64 * libcrypt has been removed from the GNU C Library. The configure
65 options "--enable-crypt" and "--enable-nss-crypt" are no longer
66 available. <crypt.h>, libcrypt.a, and libcrypt.so.1 will not be
67 installed. For now <unistd.h> continues to declare the crypt
68 function by default, to avoid introducing vulnerabilities into
69 existing applications due to a missing prototype. This declaration
70 is deprecated and may be removed in a future glibc release.
72 The replacement for libcrypt is libxcrypt, maintained separately from
73 GNU libc, but available under compatible licensing terms, and providing
74 binary backward compatibility with the former libcrypt. It is currently
75 distributed from <https://github.com/besser82/libxcrypt/>.
77 As a consequence of this removal, GNU libc no longer makes any use of
78 the NSS cryptography library (Network Security Services; not to be
79 confused with Name Service Switch). Distributors of binary packages
80 of GNU libc are advised to check whether their build processes can be
83 Changes to build and runtime requirements:
85 * Building on LoongArch requires at a minimum binutils 2.41 for vector
88 Security related changes:
90 The following CVEs were fixed in this release, details of which can be
91 found in the advisories directory of the release tarball:
93 [The release manager will add the list generated by
94 scripts/process-fixed-cves.sh just before the release.]
96 The following bugs are resolved with this release:
98 [The release manager will add the list generated by
99 scripts/list-fixed-bugs.py just before the release.]
105 * When C2X features are enabled and the base argument is 0 or 2, the
106 following functions support binary integers prefixed by 0b or 0B as
107 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
108 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
109 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
110 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
111 following functions support binary integers prefixed by 0b or 0B as
112 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
113 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
114 functions also support the %b format for binary integers, with or
115 without such a prefix and independent of standards mode.
117 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
120 * printf-family functions now support the wN format length modifiers for
121 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
122 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
123 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
124 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
125 specified in draft ISO C2X.
127 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
128 Transparent Huge Pages (THP) in stack allocation at pthread_create.
130 * Support for x86_64 running on Hurd has been added. This port requires
131 as least binutils 2.40 and GCC 13:
135 * Vector math library libmvec support has been added to AArch64. It
136 requires GCC version >= 10.1.0. It can be disabled via
137 "--disable-mathvec", however that is not a supported configuration as
138 it changes the ABI. The symbol names follow the AArch64 vector ABI,
139 they are declared in math.h and have to be called manually at this point.
141 * The strlcpy and strlcat functions have been added. They are derived
142 from OpenBSD, and are expected to be added to a future POSIX version.
144 * A new configure option, "--enable-fortify-source", can be used to build the
145 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
146 provided, or is set to the highest value supported by the compiler. If not
147 explicitly enabled, then fortify source is forcibly disabled so to keep
148 original behavior unchanged.
150 Deprecated and removed features, and other changes affecting compatibility:
152 * libcrypt is no longer built by default; one may use the "--enable-crypt"
153 option to build libcrypt. libcrypt is likely to be removed from the
154 GNU C Library in a future release, so it is recommended that
155 applications port away from it to an alternative such as libxcrypt.
157 * In the Linux kernel for the hppa/parisc architecture some of the
158 MADV_XXX constants were changed to have the same values as the other
159 architectures. New programs compiled with this glibc version and which
160 use the madvise call will require at least Linux kernel version 6.2,
161 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
162 5.4.228, 4.19.270 or 4.14.303.
164 * The "--disable-experimental-malloc" option is no longer available. The
165 per-thread cache can still be disabled per-application using tunables
166 (glibc.malloc.tcache_count set to zero).
168 * The configure option "--enable-tunables" has been removed. The tunable
169 feature is now always enabled.
171 Changes to build and runtime requirements:
173 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
176 Security related changes:
178 CVE-2023-25139: When the printf family of functions is called with a
179 format specifier that uses an <apostrophe> (enable grouping) and a
180 minimum width specifier, the resulting output could be larger than
181 reasonably expected by a caller that computed a tight bound on the
182 buffer size. The resulting larger than expected output could result
183 in a buffer overflow in the printf family of functions.
185 The following bugs are resolved with this release:
187 [178] string: Please add strlcpy and strlcat (attached)
188 [14697] nptl: Behavior of exit is nonconformant with respect to
190 [15142] stdio: Missing locking in _IO_cleanup
191 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
192 [18906] stdio: fopen: ccs value may affect open mode
193 [24466] stdio: Feature request: provide special printf formats for
195 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
196 [28519] libc: system and popen should pass "--" between /bin/sh and
198 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
199 [29591] string: wcsnlen length can overflow in page cross case.
200 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
201 [30068] stdio: incorrect printf output for integers with thousands
202 separator and width field (CVE-2023-25139)
203 [30111] time: support_descriptors_list fails after 2038 on 32 bits
205 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
206 symlink for libraries without soname
207 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
209 [30156] time: Potential ntp_gettime abi break
210 [30235] libc: Missing fallback in getlogin if loginuid is unset
211 [30258] dynamic-link: sprof cannot read and display shared object
212 profiling data correctly
213 [30263] libc: Add test coverage for abs(), labs(), and llabs().
214 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
215 [30402] libc: FAIL: elf/tst-glibcelf
216 [30425] dynamic-link: Symbol lookup during dlclose may fail
218 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
219 [30477] libc: [RISCV]: time64 does not work on riscv32
220 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
222 [30527] network: resolv_conf lock not unlocked on allocation failure
223 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
225 [30555] string: strerror can incorrectly return NULL
226 [30579] malloc: trim_threshold in realloc lead to high memory usage
227 [30662] nscd: Group and password cache use errno in place of errval
233 * The getent tool now supports the --no-addrconfig option. The output of
234 getent with --no-addrconfig may contain addresses of families not
235 configured on the current host i.e. as-if you had not passed
236 AI_ADDRCONFIG to getaddrinfo calls.
238 Deprecated and removed features, and other changes affecting compatibility:
240 * The dynamic linker no longer loads shared objects from the "tls"
241 subdirectories on the library search path or the subdirectory that
242 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
243 search mechanism, which was deprecated in version 2.33.
245 Security related changes:
247 CVE-2022-39046: When the syslog function is passed a crafted input
248 string larger than 1024 bytes, it reads uninitialized memory from the
249 heap and prints it to the target log file, potentially revealing a
250 portion of the contents of the heap.
252 The following bugs are resolved with this release:
254 [12154] network: Cannot resolve hosts which have wildcard aliases
255 [12165] libc: readdir: Do not skip entries with zero d_ino values
256 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
257 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
258 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
259 AF_INET6 address (ie docker)
260 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
262 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
263 [28937] dynamic-link: New DSO dependency sorter does not put new map
265 [29249] libc: csu/libc-tls.c:202: undefined reference to
266 `_startup_fatal_not_constant'
267 [29305] network: Inefficient buffer space usage in nss_dns for
268 gethostbyname and other functions
269 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
270 [29402] nscd: nscd: No such file or directory
271 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
273 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
274 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
276 [29463] math: math/test-float128-y1 fails on x86_64
277 [29485] build: Make hangs when the test misc/tst-pidfile returns
279 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
281 [29499] build: Check failed on misc/tst-glibcsyscalls while building
282 for RISCV64 on a unmatched hardware
283 [29501] build: Check failed on stdlib/tst-strfrom while building for
284 RISCV64 on a unmatched hardware
285 [29502] libc: alpha sys/acct.h out of date
286 [29514] build: Need to use -fPIE not -fpie
287 [29528] dynamic-link: __libc_early_init not called after dlmopen that
289 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
290 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
292 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
294 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
296 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
297 [29576] build: librtld.os: in function `_dl_start_profile':
298 (.text+0x9444): undefined reference to `strcpy'
299 [29578] libc: Definition of SUN_LEN() is wrong
300 [29583] build: iconv failures on 32bit platform due to missing large
302 [29600] dynamic-link: dlmopen hangs after loading certain libraries
303 [29604] localedata: Update locale data to Unicode 15.0.0
304 [29605] nscd: Regression in NSCD backend of getaddrinfo
305 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
307 [29611] string: Optimized AVX2 string functions unconditionally use
309 [29624] malloc: errno is not cleared when entering main
310 [29638] libc: stdlib: arc4random fallback is never used
311 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
313 [29698] build: Configuring for AArch32 on ARMv8+ disables
315 [29727] locale: __strtol_internal out-of-bounds read when parsing
317 [29730] libc: broken y2038 support in fstatat on MIPS N64
318 [29746] libc: ppoll() does not switch to __ppoll64 when
319 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
320 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
321 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
322 aux.S: No such file or directory)
323 [29864] libc: __libc_start_main() should obtain program headers
324 address (_dl_phdr) from the auxv, not the ELF header.
325 [29951] time: daylight variable not set correctly if last DST change
326 coincides with offset change
327 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
328 length in fortify mode
334 * Support for DT_RELR relative relocation format has been added to
335 glibc. This is a new ELF dynamic tag that improves the size of
336 relative relocations in shared object files and position independent
337 executables (PIE). DT_RELR generation requires linker support for
338 -z pack-relative-relocs option, which is supported for some targets
339 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
341 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
342 have been added. The pidfd functionality provides access to a process
343 while avoiding the issue of PID reuse on traditional Unix systems.
345 * On Linux, the process_madvise function has been added. It has the
346 same functionality as madvise but alters the target process identified
349 * On Linux, the process_mrelease function has been added. It allows a
350 caller to release the memory of a dying process. The release of the
351 memory is carried out in the context of the caller, using the caller's
352 CPU affinity, and priority with CPU usage accounted to the caller.
354 * The “no-aaaa” DNS stub resolver option has been added. System
355 administrators can use it to suppress AAAA queries made by the stub
356 resolver, including AAAA lookups triggered by NSS-based interfaces
357 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
358 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
359 produce IPv6 addresses, and configured IPv6 name servers are still
360 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
361 are translated to A queries. The new resolver option is intended
362 primarily for diagnostic purposes, to rule out that AAAA DNS queries
363 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
364 validation by applications.
366 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
367 and mount_setattr have been added. They are part of the new Linux kernel
368 mount APIs that allow applications to more flexibly configure and operate
369 on filesystem mounts. The new mount APIs are specifically designed to work
372 * localedef now accepts locale definition files encoded in UTF-8.
373 Previously, input bytes not within the ASCII range resulted in
374 unpredictable output.
376 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
377 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
378 Support for the char8_t typedef has been added per the ISO C2X N2653
379 proposal. The functions are declared in uchar.h in C2X mode or when the
380 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
381 The char8_t typedef is declared in uchar.h in C2X mode or when the
382 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
383 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
385 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
386 added. The functions wrap getrandom and/or /dev/urandom to return high-
387 quality randomness from the kernel.
389 * Support for LoongArch running on Linux has been added. This port requires
390 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
393 - loongarch64-linux-gnu
395 The LoongArch ABI is 64-bit little-endian.
397 Deprecated and removed features, and other changes affecting compatibility:
399 * Support for prelink will be removed in the next release; this includes
400 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
401 variables and their functionality in the dynamic loader.
403 * The Linux kernel version check has been removed along with the
404 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
405 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
406 when libc.so is issued directly.
408 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
410 The following bugs are resolved with this release:
412 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
413 return different result with versioned "foo"
414 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
416 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
417 ./exe and ld.so adjusts argv on the stack
418 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
420 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
421 consuming the second byte of certain double byte characters
422 [25812] stdio: Libio vtable protection is sometimes only partially
424 [27054] libc: pthread_atfork handlers that call pthread_atfork
426 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
428 [28128] build: declare_symbol_alias doesn't work for assembly codes
429 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
430 [28752] nss: Segfault in getpwuid when stat fails
431 [28815] libc: realpath should not copy to resolved buffer on error
432 [28828] stdio: fputwc crashes
433 [28838] libc: FAIL: elf/tst-p_align3
434 [28845] locale: ld-monetary.c should be updated to match ISO C and
436 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
438 [28852] libc: getaddrinfo leaks memory with AI_ALL
439 [28853] libc: tst-spawn6 changes current foreground process group
440 (breaks test isolation)
441 [28857] libc: FAIL: elf/tst-audit24a
442 [28860] build: --enable-kernel=5.1.0 build fails because of missing
443 __convert_scm_timestamps
444 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
445 inaccurate without /sys and /proc
446 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
448 [28880] libc: Program crashes if date beyond 2038
449 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
450 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
451 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
452 rtm variants when avoiding overflow
453 [28922] build: The .d dependency files aren't always generated
454 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
456 [28936] build: nm: No such file
457 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
458 [28953] nss: NSS lookup result can be incorrect if function lookup
460 [28970] math: benchtest: libmvec benchmark doesn't build with make
462 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
463 /sys/devices/system/cpu/possible
464 [28993] libc: closefrom() iterates until max int if no access to
466 [28996] libc: realpath fails to copy partial result to resolved buffer
468 [29027] math: [ia64] fabs fails with sNAN input
469 [29029] nptl: poll() spuriously returns EINTR during thread
470 cancellation and with cancellation disabled
471 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
472 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
473 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
474 is promoted to global scope
475 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
476 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
477 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
479 [29097] time: fchmodat does not handle 64 bit time_t for
481 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
483 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
484 [29162] string: [PATCH] string.h syntactic error:
485 include/bits/string_fortified.h:110: error: expected ',' or ';'
486 before '__fortified_attr_access'
487 [29165] libc: [Regression] broken argv adjustment
488 [29187] dynamic-link: [regression] broken argv adjustment for nios2
489 [29193] math: sincos produces a different output than sin/cos
490 [29197] string: __strncpy_power9() uses uninitialised register vs18
491 value for filling after \0
492 [29203] libc: daemon is not y2038 aware
493 [29204] libc: getusershell is not 2038 aware
494 [29207] libc: posix_fallocate fallback implementation is not y2038
496 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
497 [29209] libc: isfdtype is not y2038 aware
498 [29210] network: ruserpass is not y2038 aware
499 [29211] libc: __open_catalog is not y2038 aware
500 [29213] libc: gconv_parseconfdir is not y2038 aware
501 [29214] nptl: pthread_setcanceltype fails to set type
502 [29225] network: Mistyped define statement in socket/sys/socket.h in
504 [29274] nptl: __read_chk is not a cancellation point
505 [29279] libc: undefined reference to `mbstowcs_chk' after
506 464d189b9622932a75302290625de84931656ec0
507 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
508 correct for !__ASSUME_TIME64_SYSCALLS
509 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
510 missing on microblaze with largefile
516 * Unicode 14.0.0 Support: Character encoding, character type info, and
517 transliteration tables are all updated to Unicode 14.0.0, using
518 generator scripts contributed by Mike FABIAN (Red Hat).
520 * Bump r_version in the debugger interface to 2 and add a new field,
521 r_next, support multiple namespaces.
523 * Support for the C.UTF-8 locale has been added to glibc. The locale
524 supports full code-point sorting for all valid Unicode code points. A
525 limitation in the framework for fnmatch, regexec, and regcomp requires
526 a compromise to save space and only ASCII-based range expressions are
527 supported for now (see bug 28255). The full size of the locale is
528 only ~400KiB, with 346KiB coming from LC_CTYPE information for
529 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
530 in various downstream distributions. The locale is not built into
531 glibc, and must be installed.
533 * <math.h> functions that round their results to a narrower type, and
534 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
535 18661-3:2015 and draft ISO C2X:
537 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
538 fMxsqrtfN and fMxsqrtfNx functions.
540 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
543 * <math.h> functions for floating-point maximum and minimum,
544 corresponding to new operations in IEEE 754-2019, and corresponding
545 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
546 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
547 fminimum_mag, fminimum_mag_num and corresponding functions for float,
548 long double, _FloatN and _FloatNx.
550 * <math.h> macros for single-precision float constants are added as a
551 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
552 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
555 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
556 predefined as specified in TS 18661-1:2014.
558 * The exp10 functions in <math.h> now have a corresponding type-generic
561 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
563 * printf-family functions now support the %b format for output of
564 integers in binary, as specified in draft ISO C2X, and the %B variant
565 of that format recommended by draft ISO C2X.
567 * A new DSO sorting algorithm has been added in the dynamic linker that uses
568 topological sorting by depth-first search (DFS), solving performance issues
569 of the existing sorting algorithm when encountering particular circular
570 object dependency cases.
572 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
573 the two DSO sorting algorithms. The default setting of '2' uses the
574 new DFS-based algorithm. The setting '1' switches to the old
575 algorithm used in glibc 2.33 and earlier.
577 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
578 to be used by compilers for optimizing usage of 'memcmp' when its
579 return value is only used for its boolean status.
581 * Support for automatically registering threads with the Linux rseq
582 system call has been added. This system call is implemented starting
583 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
584 operations on per-cpu data. It allows user-space to perform updates
585 on per-cpu data without requiring heavy-weight atomic operations.
586 Automatically registering threads allows all libraries, including
587 libc, to make immediate use of the rseq support by using the
588 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
589 variables. The GNU C Library manual has details on integration of
590 Restartable Sequences.
592 * A symbolic link to the dynamic linker is now installed under
593 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
595 * All programs and the testsuite in glibc are now built as position independent
596 executables (PIE) by default on toolchains and architectures that support it.
597 Further, if the toolchain and architecture supports it, even static programs
598 are built as PIE and the resultant glibc can be used to build static PIE
599 executables. A new option --disable-default-pie has been added to disable
600 this behavior and get a non-PIE build. This option replaces
601 --enable-static-pie, which no longer has any effect on the build
604 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
605 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
606 or to use huge pages directly with mmap calls with the MAP_HUGETLB
607 flags). The former can improve performance when Transparent Huge Pages
608 is set to 'madvise' mode while the latter uses the system reserved
611 * The printf family of functions now handles the flagged %#m conversion
612 specifier, printing errno as an error constant (similar to strerrorname_np).
614 * The function _dl_find_object has been added. In-process unwinders
615 can use it to efficiently locate unwinding information for a code
618 * Support for OpenRISC running on Linux has been added. This port requires
619 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
624 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
625 64-bit file offsets (LFS default).
627 * A new configure option, --with-rtld-early-cflags, can be used to
628 specify additional compiler flags for building the early startup code
629 of the dynamic linker. On targets which have CPU compatibility
630 checks, this can help to ensure that proper diagnostics are printed if
631 the dynamic loader runs on an incompatible CPU.
633 * On Linux, the epoll_pwait2 function has been added. It is similar to
634 epoll_wait with the difference the timeout has nanoseconds resolution.
636 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
637 enabling posix_spawn and posix_spawnp to set the controlling terminal in
638 the new process in a race free manner. This function is a GNU extension.
640 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
641 applications compiling with glibc and gcc 12 and later. Level 3 leverages
642 the __builtin_dynamic_object_size function to deliver additional
643 fortification balanced against additional runtime cost (checking non-constant
646 * The audit libraries will avoid unnecessary slowdown if it is not required
647 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
649 Deprecated and removed features, and other changes affecting compatibility:
651 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
652 has been removed since the first PT_LOAD segment is no longer executable
653 due to defaulting to -z separate-code.
655 * The r_version update in the debugger interface makes the glibc binary
656 incompatible with GDB binaries built without the following commits:
658 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
659 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
661 when audit modules or dlmopen are used.
663 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
665 * The --enable-static-pie option is no longer available. The glibc build
666 configuration script now automatically detects static-pie support in the
667 toolchain and architecture and enables it if available.
669 * The catchsegv script and associated libSegFault.so shared object have
670 been removed. There are widely-deployed out-of-process alternatives for
671 catching coredumps and backtraces.
673 * Support for prelink will be removed in the next release; this includes
674 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
675 variables and their functionality in the dynamic loader.
677 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
678 functionality to obtain the program mapping address can be achieved by
679 using LD_TRACE_LOADED_OBJECTS to value of 2.
681 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
682 support prelink PIE binaries.
684 Changes to build and runtime requirements:
686 * The audit module interface version LAV_CURRENT is increased to enable
687 proper bind-now support. The loader now advertises via the la_symbind
688 flags that PLT trace is not possible. New audit modules require the
689 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
690 modules are still loaded for all targets except aarch64.
692 * The audit interface on aarch64 is extended to support both the indirect
693 result location register (x8) and NEON Q register. Old audit modules are
694 rejected by the loader. Audit modules must be rebuilt to use the newer
695 structure sizes and the latest module interface version for LAV_CURRENT.
697 Security related changes:
699 CVE-2022-23219: Passing an overlong file name to the clnt_create
700 legacy function could result in a stack-based buffer overflow when
701 using the "unix" protocol. Reported by Martin Sebor.
703 CVE-2022-23218: Passing an overlong file name to the svcunix_create
704 legacy function could result in a stack-based buffer overflow.
706 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
707 function could result in a memory leak and potential access of
708 uninitialized memory. Reported by Qualys.
710 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
711 function may result in an off-by-one buffer underflow and overflow
712 when the current working directory is longer than PATH_MAX and also
713 corresponds to the / directory through an unprivileged mount
714 namespace. Reported by Qualys.
716 The following bugs are resolved with this release:
718 [12889] nptl: Race condition in pthread_kill
719 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
720 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
721 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
723 [15333] libc: Use 64-bit stat functions in installed programs
724 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
726 [15971] dynamic-link: No interface for debugger access to libraries
728 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
729 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
730 deeply nested DSO dependencies.
731 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
732 ID whose lifetime has not ended
733 [22542] network: buffer overflow in sunrpc clnt_create
735 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
737 [25947] malloc: memory leak in muntrace
738 [26045] math: fmaxf(inf, nan) does not always work
739 [26108] math: exp10() has problems with <tgmath.h>
740 [26779] build: benign use after realloc at localealias.c:329
741 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
742 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
743 [27945] build: build-many-glibcs.py doesn't configure GCC with
744 --enable-initfini-array
745 [27991] build: x86: sysdeps/x86/configure.ac breaks when
746 libc_cv_include_x86_isa_level is loaded from cache
747 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
748 in __REDIRECT_NTH macro
749 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
750 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
752 [28126] libc: nftw aborts for paths longer than PATH_MAX
753 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
754 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
756 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
757 [28185] math: Inaccurate j0f function (again)
758 [28199] locale: iconvconfig prefix flag behaves differently in glibc
760 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
761 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
763 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
764 [28223] libc: mips: clone does not align stack
765 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
767 [28256] malloc: Conditional jump or move depends on uninitialised
768 value(s) in __GI___tunables_init
769 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
770 spawn5 fail if stray fds are open
771 [28310] libc: Do not use affinity mask for sysconf
772 (_SC_NPROCESSORS_CONF)
773 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
775 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
777 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
778 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
780 [28353] network: Race condition on __opensock
781 [28357] dynamic-link: deadlock between pthread_create and ctors
782 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
783 [28361] nptl: Fix for bug 12889 causes setxid deadlock
784 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
785 [28390] localedata: Update locale data to Unicode 14.0.0
786 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
788 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
790 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
791 to tgkill (getpid (), gettid())
792 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
793 [28457] dynamic-link: Missing reldepmod4.so dependency for
795 [28469] time: linux: struct timex is not correctly set for 32-bit
796 systems with TIMESIZE=64
797 [28470] regex: Buffer read overrun in regular expression searching
798 [28475] string: Incorrect access attribute on memfrob
799 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
800 spurious NUL character on state reset
801 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
803 [28550] dynamic-link: FAIL: tst-dso-
804 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
806 [28554] build: Undefined generate-md5
807 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
809 [28607] nptl: Masked signals are delivered on thread exit
810 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
811 lack of cpu counting /proc fallback with glibc 2.34
812 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
813 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
814 [28648] dynamic-link: Running ld.so on statically linked binaries
816 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
818 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
819 [28678] nptl: nptl/tst-create1 hangs sporadically
820 [28688] dynamic-link: PT_LOAD p_align check is too strict
821 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
823 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
824 timezones generated by tzcode-2021d and later
825 [28713] math: GCC 12 miscompiles libm
826 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
827 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
828 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
829 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
830 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
831 Assertion `GL(dl_rtld_map).l_libname' failed!
832 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
833 [28757] nptl: GDB printer tests failed with new GDB
834 [28765] math: x86_64 libmvec atan2 accuracy
835 [28766] manual: Document libmvec accuracy
836 [28768] network: Buffer overflow in svcunix_create with long pathnames
838 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
840 [28770] libc: Unexpected return value from realpath() for too long
841 results (CVE-2021-3998)
842 [28771] libc: %ebx optimization macros are incompatible with .altmacro
844 [28780] build: --disable-default-pie doesn't work on static programs
845 [28782] libc: x86-64 ISA level for glibc itself is always
847 [28792] glob: possible wrong behaviour with patterns with double [
849 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
850 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
851 empty mon_decimal_point_wc
858 * In order to support smoother in-place-upgrades and to simplify
859 the implementation of the runtime all functionality formerly
860 implemented in the libraries libpthread, libdl, libutil, libanl has
861 been integrated into libc. New applications do not need to link with
862 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
863 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
864 provided, so that the linker options keep working. Applications which
865 have been linked against glibc 2.33 or earlier continue to load the
866 corresponding shared objects (which are now empty). The integration
867 of those libraries into libc means that additional symbols become
868 available by default. This can cause applications that contain weak
869 references to take unexpected code paths that would only have been
870 used in previous glibc versions when e.g. preloading libpthread.so.0,
871 potentially exposing application bugs.
873 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
874 PTHREAD_STACK_MIN is no longer constant and is redefined to
875 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
876 sets for modern architectural features like Arm SVE.
878 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
879 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
880 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
881 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
882 dynamic sized register sets for modern architectural features like
885 * The dynamic linker implements the --list-diagnostics option, printing
886 a dump of information related to IFUNC resolver operation and
887 glibc-hwcaps subdirectory selection.
889 * On Linux, the function execveat has been added. It operates similar to
890 execve and it is is already used to implement fexecve without requiring
891 /proc to be mounted. However, different than fexecve, if the syscall is not
892 supported by the kernel an error is returned instead of trying a fallback.
894 * The ISO C2X function timespec_getres has been added.
896 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
897 C2X, is supported to enable declarations of functions defined in Annex F
898 of C2X. Those declarations are also enabled when
899 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
900 defined, and when _GNU_SOURCE is defined.
902 * On powerpc64*, glibc can now be compiled without scv support using the
903 --disable-scv configure option.
905 * Add support for 64-bit time_t on configurations like x86 where time_t
906 is traditionally 32-bit. Although time_t still defaults to 32-bit on
907 these configurations, this default may change in future versions.
908 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
909 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
910 only enabled for Linux and the full support requires a minimum kernel
913 * The main gconv-modules file in glibc now contains only a small set of
914 essential converter modules and the rest have been moved into a supplementary
915 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
916 in the same GCONV_PATH. Similarly, external converter modules directories
917 may have supplementary configuration files in a gconv-modules.d directory
918 with names ending with .conf to logically classify the converter modules in
921 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
922 to configure the size of the thread stack cache.
924 * The function _Fork has been added as an async-signal-safe fork replacement
925 since Austin Group issue 62 dropped the async-signal-safe requirement for
926 fork (and it will be included in the future POSIX standard). The new _Fork
927 function does not run any atfork function neither resets any internal state
928 or lock (such as the malloc one), and only sets up a minimal state required
929 to call async-signal-safe functions (such as raise or execve). This function
930 is currently a GNU extension.
932 * On Linux, the close_range function has been added. It allows efficiently
933 closing a range of file descriptors on recent kernels (version 5.9).
935 * The function closefrom has been added. It closes all file descriptors
936 greater than or equal to a given integer. This function is a GNU extension,
937 although it is also present in other systems.
939 * The posix_spawn_file_actions_addclosefrom_np function has been added,
940 enabling posix_spawn and posix_spawnp to close all file descriptors greater
941 than or equal to a given integer. This function is a GNU extension,
942 although Solaris also provides a similar function.
944 * When invoked explicitly, the dynamic linker now uses the kernel to
945 execute programs that do not have any dynamic dependency (that is,
946 they are statically linked). This feature is Linux-specific.
948 Deprecated and removed features, and other changes affecting compatibility:
950 * The function pthread_mutex_consistent_np has been deprecated; programs
951 should use the equivalent standard function pthread_mutex_consistent
954 * The function pthread_mutexattr_getrobust_np has been deprecated;
955 programs should use the equivalent standard function
956 pthread_mutexattr_getrobust instead.
958 * The function pthread_mutexattr_setrobust_np has been deprecated;
959 programs should use the equivalent standard function
960 pthread_mutexattr_setrobust instead.
962 * The function pthread_yield has been deprecated; programs should use
963 the equivalent standard function sched_yield instead.
965 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
967 * Various rarely-used functions declared in <resolv.h> and
968 <arpa/nameser.h> have been deprecated. Applications are encouraged to
969 use dedicated DNS processing libraries if applicable. For <resolv.h>,
970 this affects the functions dn_count_labels, fp_nquery, fp_query,
971 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
972 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
973 p_type, putlong, putshort, res_hostalias, res_isourserver,
974 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
975 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
976 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
977 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
979 * Various symbols previously defined in libresolv have been moved to libc
980 in order to prepare for libresolv moving entirely into libc (see earlier
981 entry for merging libraries into libc). The symbols __dn_comp,
982 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
983 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
984 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
985 __res_search, __res_send formerly in libresolv have been renamed and no
986 longer have a __ prefix. They are now available in libc.
988 * The pthread cancellation handler is now installed with SA_RESTART and
989 pthread_cancel will always send the internal SIGCANCEL on a cancellation
990 request. It should not be visible to applications since the cancellation
991 handler should either act upon cancellation (if asynchronous cancellation
992 is enabled) or ignore the cancellation internal signal. However there are
993 buggy kernel interfaces (for instance some CIFS versions) that could still
994 see a spurious EINTR error when cancellation interrupts a blocking syscall.
996 * Previously, glibc installed its various shared objects under versioned
997 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
998 were provided as symbolic links. Starting with glibc 2.34, the shared
999 objects are installed under their ABI sonames directly, without
1000 symbolic links. This increases compatibility with distribution
1001 package managers that delete removed files late during the package
1002 upgrade or downgrade process.
1004 * The symbols mallwatch and tr_break are now deprecated and no longer used in
1005 mtrace. Similar functionality can be achieved by using conditional
1006 breakpoints within mtrace functions from within gdb.
1008 * The __morecore and __after_morecore_hook malloc hooks and the default
1009 implementation __default_morecore have been removed from the API. Existing
1010 applications will continue to link against these symbols but the interfaces
1011 no longer have any effect on malloc.
1013 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
1014 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
1015 disabled by default in the main C library. Users looking to use these
1016 features now need to preload a new debugging DSO libc_malloc_debug.so to get
1017 this functionality back.
1019 * The deprecated functions malloc_get_state and malloc_set_state have been
1020 moved from the core C library into libc_malloc_debug.so. Legacy applications
1021 that still use these functions will now need to preload libc_malloc_debug.so
1022 in their environment using the LD_PRELOAD environment variable.
1024 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
1025 __memalign_hook and __free_hook are now removed from the API. Compatibility
1026 symbols are present to support legacy programs but new applications can no
1027 longer link to these symbols. These hooks no longer have any effect on glibc
1028 functionality. The malloc debugging DSO libc_malloc_debug.so currently
1029 supports hooks and can be preloaded to get this functionality back for older
1030 programs. However this is a transitional measure and may be removed in a
1031 future release of the GNU C Library. Users may port away from these hooks by
1032 writing and preloading their own malloc interposition library.
1034 Changes to build and runtime requirements:
1036 * On Linux, the shm_open, sem_open, and related functions now expect the
1037 file shared memory file system to be mounted at /dev/shm. These functions
1038 no longer search among the system's mount points for a suitable
1039 replacement if /dev/shm is not available.
1041 Security related changes:
1043 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1044 a request for netgroup lookup, may crash due to a double-free,
1045 potentially resulting in degraded service or Denial of Service on the
1046 local system. Reported by Chris Schanzle.
1048 CVE-2021-33574: The mq_notify function has a potential use-after-free
1049 issue when using a notification type of SIGEV_THREAD and a thread
1050 attribute with a non-default affinity mask.
1052 CVE-2021-35942: The wordexp function may overflow the positional
1053 parameter number when processing the expansion resulting in a crash.
1054 Reported by Philippe Antoine.
1056 The following bugs are resolved with this release:
1058 [4737] libc: fork is not async-signal-safe
1059 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1060 [10353] libc: Methods for deleting all file descriptors greater than
1061 given integer (closefrom)
1062 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1063 name containing multi-byte character(s)
1064 [14469] math: Inaccurate j0f function
1065 [14470] math: Inaccurate j1f function
1066 [14471] math: Inaccurate y0f function
1067 [14472] math: Inaccurate y1f function
1068 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1070 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1071 crashes if it fails dlsym() twice
1072 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1073 [16063] nptl: Provide a pthread_once variant in libc directly
1074 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1075 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1076 [17183] manual: description of ENTRY struct in <search.h> in glibc
1078 [18435] nptl: pthread_once hangs when init routine throws an exception
1079 [18524] nptl: Missing calloc error checking in
1080 __cxa_thread_atexit_impl
1081 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1082 pthread_create and dlopen
1083 [19366] nptl: returning from a thread should disable cancellation
1084 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1085 when non-root user changes priority
1086 [20802] dynamic-link: getauxval NULL pointer dereference after static
1088 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1089 [22057] malloc: malloc_usable_size is broken with mcheck
1090 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1092 [23323] libc: [RFE] CSU startup hardening.
1093 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1095 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1096 $PLATFORM, $ORIGIN) crashes
1097 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1098 [23554] nptl: pthread_getattr_np reports wrong stack size with
1100 [24106] libc: Bash interpreter in ldd script is taken from host
1101 [24773] dynamic-link: dlerror in an secondary namespace does not use
1102 the right free implementation
1103 [25036] localedata: Update collation order for Swedish
1104 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1105 shm_open to pick wrong directory
1106 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1107 crash in IFUNC resolver due to stack canary (--enable-stack-
1109 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1110 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1111 [27111] dynamic-link: pthread_create and tls access use link_map
1112 objects that may be concurrently freed by dlclose
1113 [27132] malloc: memusagestat is linked to system librt, leading to
1114 undefined symbols on major version upgrade
1115 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1117 [27249] libc: libSegFault.so does not output signal number properly
1118 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1120 [27318] dynamic-link: glibc fails to load binaries when built with
1121 -march=sandybridge: CPU ISA level is lower than required
1122 [27343] nss: initgroups() SIGSEGVs when called on a system without
1123 nsswich.conf (in a chroot)
1124 [27346] dynamic-link: x86: PTWRITE feature check is missing
1125 [27389] network: NSS chroot hardening causes regressions in chroot
1127 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1128 [27444] libc: sysconf reports unsupported option (-1) for
1129 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1130 [27462] nscd: double-free in nscd (CVE-2021-27645)
1131 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1132 malloc/tst-malloc-thread-fail
1133 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1134 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1136 [27522] glob: glob, glob64 incorrectly marked as __THROW
1137 [27555] dynamic-link: Static tests fail with --enable-stack-
1139 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1140 information for the current directory
1141 [27577] dynamic-link: elf/ld.so --help doesn't work
1142 [27605] libc: tunables can't control xsave/xsavec selection in
1143 dl_runtime_resolve_*
1144 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1145 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1147 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1148 _nss_files_getcanonname_r) from within a dlmopen namespace.
1149 [27648] libc: FAIL: misc/tst-select
1150 [27650] stdio: vfscanf returns too early if a match is longer than
1152 [27651] libc: Performance regression after updating to 2.33
1153 [27655] string: Wrong size calculation in string/test-strnlen.c
1154 [27706] libc: select fails to update timeout on error
1155 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1156 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1157 tries resolving them lazily
1158 [27744] nptl: Support different libpthread/ld.so load orders in
1160 [27749] libc: Data race __run_exit_handlers
1161 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1163 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1164 exceeds maximum object size 2147483647
1165 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1167 [27872] build: Obsolete configure option --enable-stackguard-
1169 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1170 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1171 [27892] libc: powerpc: scv ABI error handling fails to check
1173 [27896] nptl: mq_notify does not handle separately allocated thread
1174 attributes (CVE-2021-33574)
1175 [27901] libc: TEST_STACK_ALIGN doesn't work
1176 [27902] libc: The x86-64 clone wrapper fails to align child stack
1177 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1178 [27939] libc: aarch64: clone does not align the stack
1179 [27968] libc: s390x: clone does not align the stack
1180 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1181 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1182 with n >= 0x80000000
1183 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1184 thread never allocated anything
1185 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1186 [28064] string: x86_64:wcslen implementation list has wcsnlen
1187 [28067] libc: FAIL: posix/tst-spawn5
1188 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1189 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1191 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1192 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1193 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1195 [28091] network: ns_name_skip may return 0 for domain names without
1203 * The dynamic linker accepts the --list-tunables argument which prints
1204 all the supported tunables. This option is disable if glibc is
1205 configured with tunables disabled (--enable-tunables=no).
1207 * The dynamic linker accepts the --argv0 argument and provides opportunity
1208 to change argv[0] string.
1210 * The dynamic linker loads optimized implementations of shared objects
1211 from subdirectories under the glibc-hwcaps directory on the library
1212 search path if the system's capabilities meet the requirements for
1213 that subdirectory. Initially supported subdirectories include
1214 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1215 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1216 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1217 subdirectory names correspond to the vendor-independent x86-64
1218 microarchitecture levels defined in the x86-64 psABI supplement.
1220 * The new --help option of the dynamic linker provides usage and
1221 information and library search path diagnostics.
1223 * The mallinfo2 function is added to report statistics as per mallinfo,
1224 but with larger field widths to accurately report values that are
1225 larger than fit in an integer.
1227 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1229 * Support for the RISC-V ISA running on Linux has been expanded to run on
1230 32-bit hardware. This is supported for the following ISA and ABI pairs:
1236 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1239 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1240 glibc may use additional checks that may have an additional performance
1241 overhead. At present these checks are available only on LLVM 9 and later.
1242 The latest GCC available at this time (10.2) does not support this level of
1245 Deprecated and removed features, and other changes affecting compatibility:
1247 * The mallinfo function is marked deprecated. Callers should call
1250 * When dlopen is used in statically linked programs, alternative library
1251 implementations from HWCAP subdirectories are no longer loaded.
1252 Instead, the default implementation is used.
1254 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1255 removed. To support old binaries, the vtimes function continues to exist
1256 as a compatibility symbol. Applications should use the getrlimit or
1259 * Following a change in the tzdata 2018a release upstream, the zdump
1260 program is now installed in the /usr/bin subdirectory. Previously,
1261 the /usr/sbin subdirectory was used.
1263 * On s390(x), the type float_t is now derived from the macro
1264 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1265 hardcoded to double. This does not affect the ABI of any libraries
1266 that are part of the GNU C Library, but may affect the ABI of other
1267 libraries that use this type in their interfaces. The new definition
1268 improves consistency with compiler behavior in many scenarios.
1270 * A future version of glibc will stop loading shared objects from the
1271 "tls" subdirectories on the library search path, the subdirectory that
1272 corresponds to the AT_PLATFORM system name, and also stop employing
1273 the legacy AT_HWCAP search mechanism. Applications should switch to
1274 the new glibc-hwcaps mechanism instead; if they do not do that, only
1275 the baseline version (directly from the search path directory) will be
1278 Changes to build and runtime requirements:
1280 * On Linux, the system administrator needs to configure /dev/pts with
1281 the intended access modes for pseudo-terminals. glibc no longer
1282 attempts to adjust permissions of terminal devices. The previous glibc
1283 defaults ("tty" group, user read/write and group write) already
1284 corresponded to what most systems used, so that grantpt did not
1285 perform any adjustments.
1287 * On Linux, the posix_openpt and getpt functions no longer attempt to
1288 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1289 (and pseudo-terminals are supported), a devpts file system is mounted
1290 on /dev/pts. Current systems already meet these requirements.
1292 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1294 Security related changes:
1296 CVE-2021-3326: An assertion failure during conversion from the
1297 ISO-20220-JP-3 character set using the iconv function has been fixed.
1298 This assertion was triggered by certain valid inputs in which the
1299 converted output contains a combined sequence of two wide characters
1300 crossing a buffer boundary. Reported by Tavis Ormandy.
1302 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1303 invoked with input containing redundant shift sequences in the IBM1364,
1304 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1306 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1307 when invoked with UCS4 input containing an invalid character.
1309 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1310 invoked with EUC-KR input containing invalid multibyte input sequences.
1312 The following bugs are resolved with this release:
1314 [10635] libc: realpath portability patches
1315 [16124] dynamic-link: ld.so should allow to change argv[0]
1316 [17924] malloc: 'free' should not set errno
1317 [18683] libc: Linux faccessat implementation can incorrectly ignore
1319 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1320 [23091] hurd: missing waitid support
1321 [23249] libc: Epyc and other current AMD CPUs do not select the
1322 "haswell" platform subdirectory
1323 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1325 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1327 [24941] libc: Make grantpt usable after multi-threaded fork in more
1329 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1330 [24973] locale: iconv encounters segmentation fault when converting
1331 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1332 [25399] string: undefined reference to `__warn_memset_zero_len' when
1333 changing gnuc version
1334 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1336 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1338 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1339 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1340 [26100] libc: Race in syslog(3) with regards to tag printing.
1341 [26124] libc: Export <cpu-features.h>
1342 [26130] nscd: Inconsistent nscd cache during pruning
1343 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1344 [26224] locale: iconv hangs when converting some invalid inputs from
1345 several IBM character sets (CVE-2020-27618)
1346 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1347 too much stack space
1348 [26343] manual: invalid documented return type for strerrorname_np(),
1349 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1350 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1352 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1354 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1355 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1357 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1358 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1359 [26555] string: strerrorname_np does not return the documented value
1360 [26592] libc: pointer arithmetic overflows in realpath
1361 [26600] network: Transaction ID collisions cause slow DNS lookups in
1363 [26606] libc: [2.33 Regression] pselect is broken on x32
1364 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1365 [26620] glob: fnmatch with collating symbols results in segmentation
1367 [26625] libc: [2.33 Regression] CET is disabled
1368 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1369 at the end of a memory mapping
1370 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1371 by the caller to the kernel
1372 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1373 [26647] build: [-Werror=array-parameter=] due to different
1374 declarations for __sigsetjmp
1375 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1377 [26649] stdio: printf should handle non-normal x86 long double numbers
1378 gracefully (CVE-2020-29573)
1379 [26686] build: -Warray-parameter instances building with GCC 11
1380 [26687] build: -Warray-bounds instances building with GCC 11
1381 [26690] stdio: Aliasing violation in __vfscanf_internal
1382 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1383 [26726] build: GCC warning calling new_composite_name with an array of
1385 [26736] libc: FAIL: misc/tst-sysvshm-linux
1386 [26737] libc: Random FAIL: rt/tst-shm
1387 [26791] libc: Missing O_CLOEXEC in sysconf.c
1388 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1390 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1392 [26818] string: aarch64: string tests may run ifunc variants that are
1394 [26821] libc: Memory leak test failures on Fedora 33
1395 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1396 FSGSBASE/LM/RDRAND check failure
1397 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1399 [26853] libc: aarch64: Missing unwind information in statically linked
1401 [26923] locale: Assertion failure in iconv when converting invalid
1402 UCS4 (CVE-2020-29562)
1403 [26926] dynamic-link: aarch64: library dependencies are not bti
1405 [26932] libc: sh: Multiple floating point functions defined as stubs
1407 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1409 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1411 [27002] build: libc_freeres_fn build failure with GCC 11
1412 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1413 [27008] dynamic-link: ld.so.cache should have endianness markup
1414 [27042] libc: [alpha] anonymous union in struct stat confuses
1416 [27053] libc: Conformance regression in system(3) (and probably also
1418 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1420 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1421 [27083] libc: Unsafe unbounded alloca in addmntent
1422 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1424 [27130] string: "rep movsb" performance issue
1425 [27150] libc: alpha: wait4() is unavailable in static linking
1426 [27177] dynamic-link:
1427 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1429 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1430 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1431 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1432 related to combining characters (CVE-2021-3326)
1439 * Unicode 13.0.0 Support: Character encoding, character type info, and
1440 transliteration tables are all updated to Unicode 13.0.0, using
1441 generator scripts contributed by Mike FABIAN (Red Hat).
1443 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1445 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1446 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1447 Three ABIs are supported:
1453 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1454 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1456 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1457 DT_DEPAUDIT dynamic section entries of the main executable.
1459 * powerpc64le supports IEEE128 long double libm/libc redirects when
1460 using -mabi=ieeelongdouble to compile C code on supported GCC
1461 toolchains. It is recommended to use GCC 8 or newer when testing
1464 * To help detect buffer overflows and other out-of-bounds accesses
1465 several APIs have been annotated with GCC 'access' attribute. This
1466 should help GCC 10 issue better warnings.
1468 * On Linux, functions pthread_attr_setsigmask_np and
1469 pthread_attr_getsigmask_np have been added. They allow applications
1470 to specify the signal mask of a thread created with pthread_create.
1472 * The GNU C Library now provides the header file <sys/single_threaded.h>
1473 which declares the variable __libc_single_threaded. Applications are
1474 encouraged to use this variable for single-thread optimizations,
1475 instead of weak references to symbols historically defined in
1478 * The functions sigabbrev_np and sigdescr_np have been added. The
1479 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1480 SIGHUP) while sigdescr_np returns a string describing the signal number
1481 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1482 attempt to translate the return description, both functions return
1483 NULL for an invalid signal number.
1485 They should be used instead of sys_siglist or sys_sigabbrev and they
1486 are both thread and async-signal safe. These functions are GNU extensions.
1488 * The functions strerrorname_np and strerrordesc_np have been added. The
1489 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1490 while strerrordesc_np returns a string describing the error number
1491 (e.g "Invalid argument" for EINVAL). Different than strerror,
1492 strerrordesc_np does not attempt to translate the return description, both
1493 functions return NULL for an invalid error number.
1495 They should be used instead of sys_errlist and sys_nerr, both are
1496 thread and async-signal safe. These functions are GNU extensions.
1498 * AArch64 now supports standard branch protection security hardening
1499 in glibc when it is built with a GCC that is configured with
1500 --enable-standard-branch-protection (or if -mbranch-protection=standard
1501 flag is passed when building both GCC target libraries and glibc,
1502 in either case a custom GCC is needed). This includes branch target
1503 identification (BTI) and pointer authentication for return addresses
1504 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1505 extensions respectively for the protection to be effective,
1506 otherwise the used instructions are nops. User code can use PAC-RET
1507 without libc support, but BTI requires a libc that is built with BTI
1508 support, otherwise runtime objects linked into user code will not be
1511 Deprecated and removed features, and other changes affecting compatibility:
1513 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1514 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1515 RPC header files. Backward compatibility for old programs is kept
1516 only for architectures and ABIs that have been added in or before
1517 glibc 2.31. New programs need to use TI-RPC
1518 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1519 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1521 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1522 as shared library for backward compatibility and the NSS modules "nis"
1523 and "nisplus" are not built at all and libnsl's headers aren't
1524 installed. This compatibility is kept only for architectures and ABIs
1525 that have been added in or before version 2.28. Replacement
1526 implementations based on TI-RPC, which additionally support IPv6, are
1527 available from <https://github.com/thkukuk/>. This change does not
1528 affect the "compat" NSS module, which does not depend on libnsl
1529 since 2.27 and thus can be used without NIS.
1531 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1532 removed. To support old binaries, the sysctl function continues to
1533 exist as a compatibility symbol (on those architectures which had it),
1534 but always fails with ENOSYS. This reflects the removal of the system
1535 call from all architectures, starting with Linux 5.5.
1537 * The sstk function is no longer available to newly linked binaries.
1538 Its implementation always returned with a failure, and the function
1539 was not declared in any header file.
1541 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1542 sigrelse, sigignore and sigset, and the sigmask macro have been
1543 deprecated. Applications should use the sigsuspend, sigprocmask and
1544 sigaction functions instead.
1546 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1547 already supported this format for almost 20 years.
1549 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1550 are no longer available to newly linked binaries, and their declarations
1551 have been removed from <string.h>. They are exported solely as
1552 compatibility symbols to support old binaries. All programs should use
1555 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1556 are no longer available to newly linked binaries, and their declarations
1557 have been removed from <stdio.h>. They are exported solely as
1558 compatibility symbols to support old binaries. All programs should use
1559 strerror or strerror_r instead.
1561 * Both strerror and strerror_l now share the same internal buffer in the
1562 calling thread, meaning that the returned string pointer may be invalided
1563 or contents might be overwritten on subsequent calls in the same thread or
1564 if the thread is terminated. It makes strerror MT-safe.
1566 * Using weak references to libpthread functions such as pthread_create
1567 or pthread_key_create to detect the singled-threaded nature of a
1568 program is an obsolescent feature. Future versions of glibc will
1569 define pthread_create within libc.so.6 itself, so such checks will
1570 always flag the program as multi-threaded. Applications should check
1571 the __libc_single_threaded variable declared in
1572 <sys/single_threaded.h> instead.
1574 * The "files" NSS module no longer supports the "key" database (used for
1575 secure RPC). The contents of the /etc/publickey file will be ignored,
1576 regardless of the settings in /etc/nsswitch.conf. (This method of
1577 storing RPC keys only supported the obsolete and insecure AUTH_DES
1578 flavor of secure RPC.)
1580 * The __morecore and __after_morecore_hook malloc hooks and the default
1581 implementation __default_morecore have been deprecated. Applications
1582 should use malloc interposition to change malloc behavior, and mmap to
1583 allocate anonymous memory. A future version of glibc may require that
1584 applications which use the malloc hooks must preload a special shared
1585 object, to enable the hooks.
1587 * The hesiod NSS module has been deprecated and will be removed in a
1588 future version of glibc. System administrators are encouraged to
1589 switch to other approaches for networked account databases, such as
1592 Changes to build and runtime requirements:
1594 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1595 long double redirects.
1597 Security related changes:
1599 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1600 invoked with the -c option and when processing invalid multi-byte input
1601 sequences. Reported by Jan Engelhardt.
1603 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1604 corruption when they were passed a pseudo-zero argument. Reported by Guido
1605 Vranken / ForAllSecure Mayhem.
1607 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1608 expanding ~user has been fixed.
1610 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1611 memmove functions has been fixed. Discovered by Jason Royes and Samual
1612 Dytrych of the Cisco Security Assessment and Penetration Team (See
1615 The following bugs are resolved with this release:
1617 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1618 [10441] manual: Backtraces code example lacks error checking
1619 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1620 timer_sigev_thread dangerous
1621 [14231] stdio: stdio-common tests memory requirements
1622 [14578] libc: /proc-based emulation for lchmod, fchmodat
1623 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1624 filtee has constructor
1625 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1626 sequences (CVE-2016-10228)
1627 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1628 character entities for infinity & pi
1629 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1630 segfaults in applications
1631 [20543] libc: Please move from .gnu.linkonce to comdat
1632 [22489] network: gcc warns about implicit conversion in
1633 ICMP6_FILTER_SETPASS with -Wsign-conversion
1634 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1635 [23294] math: Complex _FloatN functions are redirected to the wrong
1636 function with -mlong-double-64
1637 [23296] libc: Data race in setting function descriptor during lazy
1639 [23668] dynamic-link: ldconfig: Default to the new format for
1641 [23819] hurd: hurd: Add C11 thread support
1642 [23990] build: test-container error out on failure to exec child.
1643 [23991] build: shell-container typo in run_command_array
1644 [24638] manual: Error in example of parsing a template string
1645 [24654] manual: Wrong declaration of wcschr in libc manual
1646 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1648 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1649 dynamically loaded dsos
1650 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1651 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1653 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1654 restore EAX, ECX and EDX
1655 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1656 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1657 [25420] network: Race condition in resolv_conf.c can result in caching
1658 stale configuration forever
1659 [25487] math: sinl() stack corruption from crafted input
1661 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1663 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1664 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1666 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1667 on 32 bit and old kernel
1668 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1669 [25639] localedata: Some names of days and months wrongly spelt in
1671 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1672 amount of sigset_t bytes
1673 [25691] stdio: printf: memory leak when printing long multibyte
1675 [25715] libc: system() returns wrong errors when posix_spawn fails
1676 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1677 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1678 state for conversions that produce two Unicode code points
1679 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1680 for linux x86_64 leads to livelock
1681 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1682 test failures, invalid instruction in ld.so
1683 [25790] glob: Typo in tst-fnmatch.input
1684 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1686 [25819] localedata: Update locale data to Unicode 13.0.0
1687 [25824] libc: Abnormal function of strnlen in aarch64
1688 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1689 [25896] libc: Incorrect prctl
1690 [25902] libc: Bad LOADARGS_N
1691 [25905] dynamic-link: VSX registers are corrupted during PLT
1692 resolution when glibc is built with --disable-multi-arch and --with-
1694 [25933] string: Off by one error in __strncmp_avx2 when
1695 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1697 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1698 exiting detached thread
1699 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1701 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1703 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1704 [26073] math: getpayload() has wrong return value
1705 [26076] dynamic-link: dlmopen crashes after failing to load
1706 dependencies in audit mode
1707 [26120] localedata: column width of of some Korean
1708 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1709 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1710 [26133] libc: Incorrect need_arch_feature_F16C
1711 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1713 [26149] libc: PKU is usable only if OSPKE is set
1714 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1716 [26208] libc: Incorrect bit_cpu_CLFSH
1717 [26210] network: Incorrect use of hidden symbols for global sunrpc
1719 [26211] stdio: printf integer overflow calculating allocation size
1720 [26214] stdio: printf_fp double free
1721 [26215] stdio: printf_fp memory leak
1722 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1723 [26258] nss: nss_compat should not read input files with mmap
1724 [26332] string: Incorrect cache line size load causes memory
1725 corruption in memset
1732 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1733 enable features from the draft ISO C2X standard. Only some features from
1734 this draft standard are supported by the GNU C Library, and as the draft
1735 is under active development, the set of features enabled by this macro is
1736 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1737 by compiling with "gcc -std=gnu2x".
1739 * The <math.h> functions that round their results to a narrower type now
1740 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1741 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1742 Clarification Request 13 to TS 18661-3.
1744 * The function pthread_clockjoin_np has been added, enabling join with a
1745 terminated thread with a specific clock. It allows waiting against
1746 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1748 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1750 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1751 in queries if the trust-ad option is set via the options directive in
1752 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1753 mode, the AD bit, as provided by the name server, is available to
1754 applications which call res_search and related functions. In the default
1755 mode, the AD bit is not set in queries, and it is automatically cleared in
1756 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1757 servers and the network path to them are treated as untrusted.)
1759 Deprecated and removed features, and other changes affecting compatibility:
1761 * The totalorder and totalordermag functions, and the corresponding
1762 functions for other floating-point types, now take pointer arguments to
1763 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1764 passing. This is in accordance with the resolution of Clarification
1765 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1766 floating-point arguments directly will continue to work.
1768 * The obsolete function stime is no longer available to newly linked
1769 binaries, and its declaration has been removed from <time.h>.
1770 Programs that set the system time should use clock_settime instead.
1772 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1773 in a future version of glibc. In this release, the header still exists
1774 but calling ftime will cause a compiler warning. All programs should use
1775 gettimeofday or clock_gettime instead.
1777 * The gettimeofday function no longer reports information about a
1778 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1779 many years, as it cannot handle the full complexity of the world's
1780 timezones, but hitherto we have supported it on a best-effort basis.
1781 Changes required to support 64-bit time_t on 32-bit architectures have
1782 made this no longer practical.
1784 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1785 should expect to receive a 'struct timezone' whose tz_minuteswest and
1786 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1787 happen on a few Linux-based ports. This will be corrected in a future
1790 All callers should supply a null pointer for the 'tzp' argument to
1791 gettimeofday. For accurate information about the time zone associated
1792 with the current time, use the localtime function.
1794 gettimeofday itself is obsolescent according to POSIX. We have no plans
1795 to remove access to this function, but portable programs should consider
1796 using clock_gettime instead.
1798 * The settimeofday function can still be used to set a system-wide time
1799 zone when the operating system supports it. This is because the Linux
1800 kernel reused the API, on some architectures, to describe a system-wide
1801 time-zone-like offset between the software clock maintained by the kernel,
1802 and the "RTC" clock that keeps time when the system is shut down.
1804 However, to reduce the odds of this offset being set by accident,
1805 settimeofday can no longer be used to set the time and the offset
1806 simultaneously. If both of its two arguments are non-null, the call
1807 will fail (setting errno to EINVAL).
1809 Callers attempting to set this offset should also be prepared for the call
1810 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1811 some Linux architectures. The Linux kernel maintainers are discussing a
1812 more principled replacement for the reused API. After a replacement
1813 becomes available, we will change settimeofday to fail with ENOSYS on all
1814 platforms when its 'tzp' argument is not a null pointer.
1816 settimeofday itself is obsolescent according to POSIX. Programs that set
1817 the system time should use clock_settime and/or the adjtime family of
1818 functions instead. We may cease to make settimeofday available to newly
1819 linked binaries after there is a replacement for Linux's time-zone-like
1822 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1823 the optional CAS instruction is implemented (for instance, LEON processors
1824 are still supported, but SuperSPARC processors are not).
1826 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1829 * If a lazy binding failure happens during dlopen, during the execution of
1830 an ELF constructor, the process is now terminated. Previously, the
1831 dynamic loader would return NULL from dlopen, with the lazy binding error
1832 captured in a dlerror message. In general, this is unsafe because
1833 resetting the stack in an arbitrary function call is not possible.
1835 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1836 executable stack unless explicitly configured at build time to require
1837 minimum kernel version 4.8 or newer. This is because executing
1838 floating-point branches on a non-executable stack on Linux kernels prior to
1839 4.8 can lead to application crashes for some MIPS configurations. While
1840 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1841 expected to enable non-executable stack by default with PT_GNU_STACK by
1842 default and is thus likely to trigger a crash on older kernels.
1844 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1845 non-executable stack while dropping support for older kernels.
1847 * System call wrappers for time system calls now use the new time64 system
1848 calls when available. On 32-bit targets, these wrappers attempt to call
1849 the new system calls first and fall back to the older 32-bit time system
1850 calls if they are not present. This may cause issues in environments
1851 that cannot handle unsupported system calls gracefully by returning
1852 -ENOSYS. Seccomp sandboxes are affected by this issue.
1854 Changes to build and runtime requirements:
1856 * It is no longer necessary to have recent Linux kernel headers to build
1857 working (non-stub) system call wrappers on all architectures except 64-bit
1858 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1860 * The ChangeLog file is no longer present in the toplevel directory of the
1861 source tree. ChangeLog files are located in the ChangeLog.old directory as
1862 ChangeLog.N where the highest N has the latest entries.
1864 Security related changes:
1866 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1867 out-of-bounds write when executed in a signal frame context.
1869 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1870 environment variable during program execution after a security
1871 transition, allowing local attackers to restrict the possible mapping
1872 addresses for loaded libraries and thus bypass ASLR for a setuid
1873 program. Reported by Marcin Kościelnicki.
1875 The following bugs are resolved with this release:
1877 [12031] localedata: iconv -t ascii//translit with Greek characters
1878 [15813] libc: Multiple issues in __gen_tempname
1879 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1880 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1881 [19767] libc: vdso is not used with static linking
1882 [19903] hurd: Shared mappings not being inherited by children processes
1883 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1884 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1886 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1887 Symbols-A/B Unicode blocks
1888 [23518] libc: Eliminate __libc_utmp_jump_table
1889 [24026] malloc: malloc_info() returns wrong numbers
1890 [24054] localedata: Many locales are missing date_fmt
1891 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1892 [24304] dynamic-link: Lazy binding failure during ELF
1893 constructors/destructors is not fatal
1894 [24376] libc: RISC-V symbol size confusion with _start
1895 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1897 [24824] libc: test-in-container does not install charmap files compatible
1899 [24844] regex: regex bad pointer / leakage if malloc fails
1900 [24867] malloc: Unintended malloc_info formatting changes
1901 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1902 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1903 [24882] libc: login: pututline uses potentially outdated cache
1904 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1905 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1907 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1909 [24930] dynamic-link: dlopen of PIE executable can result in
1910 _dl_allocate_tls_init assertion failure
1911 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1912 (stringop-overflow error)
1913 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1914 functions other can lead to crashes
1915 [24967] libc: jemalloc static linking causes runtime failure
1916 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1918 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1919 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1920 [25097] libc: new -Warray-bounds with GCC 10
1921 [25112] dynamic-link: dlopen must not make new objects accessible when it
1922 still can fail with an error
1923 [25139] localedata: Please add the new mnw_MM locale
1924 [25149] regex: Array bounds violation in proceed_next_node
1925 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1926 initialized correctly
1927 [25189] libc: glibc's __glibc_has_include causes issues with clang
1929 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1930 value to an unsigned
1931 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1932 binaries (CVE-2019-19126)
1933 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1935 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1937 [25232] string: <string.h> does not enable const correctness for strchr et
1939 [25233] localedata: Consider "." as the thousands separator for sl_SI
1941 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1942 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1943 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1945 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1946 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1948 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1949 (dl_initfirst) link map pointer
1950 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1951 [25423] libc: Array overflow in backtrace on powerpc
1952 [25425] network: Missing call to __resolv_context_put in
1953 getaddrinfo.c:gethosts
1960 * Unicode 12.1.0 Support: Character encoding, character type info, and
1961 transliteration tables are all updated to Unicode 12.1.0, using
1962 generator scripts contributed by Mike FABIAN (Red Hat).
1964 * The dynamic linker accepts the --preload argument to preload shared
1965 objects, in addition to the LD_PRELOAD environment variable.
1967 * The twalk_r function has been added. It is similar to the existing
1968 twalk function, but it passes an additional caller-supplied argument
1969 to the callback function.
1971 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1973 * Minguo (Republic of China) calendar support has been added as an
1974 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1977 * The entry for the new Japanese era has been added for ja_JP locale.
1979 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1980 pvalloc, memalign, and posix_memalign fail now with total object size
1981 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1982 pointer subtraction within the allocated object, where results might
1983 overflow the ptrdiff_t type.
1985 * The dynamic linker no longer refuses to load objects which reference
1986 versioned symbols whose implementation has moved to a different soname
1987 since the object has been linked. The old error message, symbol
1988 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1989 link time reference, is gone.
1991 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1992 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1993 functions. These behave similarly to their "timed" equivalents, but also
1994 accept a clockid_t parameter to determine which clock their timeout should
1995 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1996 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1997 time of the wait (unlike with pthread_condattr_setclock, which requires
1998 the clock choice at initialization time).
2000 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
2001 work, new resolvers can use a second argument which can be extended in
2002 the future, currently it contains the AT_HWCAP2 value.
2004 Deprecated and removed features, and other changes affecting compatibility:
2006 * The copy_file_range function fails with ENOSYS if the kernel does not
2007 support the system call of the same name. Previously, user space
2008 emulation was performed, but its behavior did not match the kernel
2009 behavior, which was deemed too confusing. Applications which use the
2010 copy_file_range function can no longer rely on glibc to provide a fallback
2011 on kernels that do not support the copy_file_range system call, and if
2012 this function returns ENOSYS, they will need to use their own fallback.
2013 Support for copy_file_range for most architectures was added in version
2014 4.5 of the mainline Linux kernel.
2016 * The functions clock_gettime, clock_getres, clock_settime,
2017 clock_getcpuclockid, clock_nanosleep were removed from the librt library
2018 for new applications (on architectures which had them). Instead, the
2019 definitions in libc will be used automatically, which have been available
2022 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
2023 and <sys/stropts.h> have been removed.
2025 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
2026 resolver flag (deprecated in glibc 2.25) have been removed.
2028 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
2029 resolver have been removed from <resolv.h>.
2031 * With --enable-bind-now, installed programs are now linked with the
2034 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
2035 configurations) has been removed, following the deprecation of this
2036 subarchitecture in version 8 of GCC, and its removal in version 9.
2038 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2039 header have been removed.
2041 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2042 deprecated and will be removed from a future version of glibc.
2043 Application should directly access /proc instead. For obtaining random
2044 bits, the getentropy function can be used.
2046 Changes to build and runtime requirements:
2048 * GCC 6.2 or later is required to build the GNU C Library.
2050 Older GCC versions and non-GNU compilers are still supported when
2051 compiling programs that use the GNU C Library.
2053 Security related changes:
2055 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2056 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2057 has undefined behavior. On x32, the size_t argument may be passed
2058 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2059 32 bits. When it happened with the sign bit of RDX register set,
2060 memcmp gave the wrong result since it treated the size argument as
2061 zero. Reported by H.J. Lu.
2063 CVE-2019-9169: Attempted case-insensitive regular-expression match
2064 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2065 over-read. Reported by Hongxu Chen.
2067 The following bugs are resolved with this release:
2069 [2872] locale: Transliteration Cyrillic -> ASCII fails
2070 [6399] libc: gettid() should have a wrapper
2071 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2072 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2073 [17396] localedata: globbing for locale by [[.collating-element.]]
2074 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2075 [18465] malloc: memusagestat is built using system C library
2076 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2077 invalid input drops valid char
2078 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2079 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2080 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2081 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2082 [23352] malloc: __malloc_check_init still defined in public header
2084 [23403] nptl: Wrong alignment of TLS variables
2085 [23501] libc: nftw() doesn't return dangling symlink's inode
2086 [23733] malloc: Check the count before calling tcache_get()
2087 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2089 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2090 [23844] nptl: pthread_rwlock_trywrlock results in hang
2091 [23983] argparse: Missing compat versions of argp_failure and argp_error
2092 for long double = double
2093 [23984] libc: Missing compat versions of err.h and error.h functions for
2094 long double = double
2095 [23996] localedata: Dutch salutations
2096 [24040] libc: riscv64: unterminated call chain in __thread_start
2097 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2099 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2100 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2102 [24114] regex: regexec buffer read overrun in "grep -i
2103 '\(\(\)*.\)*\(\)\(\)\1'"
2104 [24122] libc: Segfaults if 0 returned from la_version
2105 [24153] stdio: Some input functions do not react to stdin assignment
2106 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2107 RDX is set) (CVE-2019-7309)
2108 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2109 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2110 not the default "nor"
2111 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2112 false positives, change to modern flexible array
2113 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2114 instructions while maintaining the robust mutex list due to missing
2116 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2117 unnecessary librt dependencies
2118 [24200] localedata: Revert first_weekday removal in en_IE locale
2119 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2120 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2121 [24216] malloc: Check for large bin list corruption when inserting
2123 [24228] stdio: old x86 applications that use legacy libio crash on exit
2124 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2126 [24293] localedata: Missing Minguo calendar support for TW locales
2127 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2128 tt_RU (Tatar) locale
2129 [24307] localedata: Update locale data to Unicode 12.0.0
2130 [24323] dynamic-link: dlopen should not be able open PIE objects
2131 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2132 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2133 tt_RU (Tatar) locale
2134 [24370] localedata: Add lang_name for tt_RU locale
2135 [24372] locale: Binary locale files are not architecture independent
2136 [24394] time: strptime %Ey mis-parses final year of era
2137 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2139 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2141 [24531] malloc: Malloc tunables give tcache assertion failures
2142 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2144 [24535] localedata: Update locale data to Unicode 12.1.0
2145 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2146 kernels and break testing
2147 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2148 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2149 [-Werror=format-overflow=]
2150 [24570] libc: alpha: compat msgctl uses __IPC_64
2151 [24584] locale: Data race in __wcsmbs_clone_conv
2152 [24588] stdio: Remove codecvt vtables from libio
2153 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2155 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2156 [24632] stdio: Old binaries which use freopen with default stdio handles
2158 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2160 [24652] localedata: szl_PL spelling correction
2161 [24695] nss: nss_db: calling getpwent after endpwent crashes
2162 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2163 in /etc/nsswitch.conf
2164 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2165 [24740] libc: getdents64 type confusion
2166 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2167 always implemented in the same library
2168 [24744] libc: Remove copy_file_range emulation
2169 [24757] malloc: memusagestat is linked against system libpthread
2170 [24794] libc: Partial test suite run builds corrupt test-in-container
2178 * The getcpu wrapper function has been added, which returns the currently
2179 used CPU and NUMA node. This function is Linux-specific.
2181 * A new convenience target has been added for distribution maintainers
2182 to build and install all locales as directories with files. The new
2183 target is run by issuing the following command in your build tree:
2184 'make localedata/install-locale-files', with an optional DESTDIR
2185 to set the install root if you wish to install into a non-default
2186 configured location.
2188 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2190 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2191 for _GNU_SOURCE, to match BSD environments.
2193 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2194 indicates that it will abort the transaction prior to entering the kernel
2195 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2196 suspended, and this caused some undefined side-effects issues by aborting
2197 transactions manually. Glibc avoided it by abort transactions manually on
2198 each syscall, but it lead to performance issues on newer kernels where the
2199 HTM state is saved and restore lazily (the state being saved even when the
2200 process actually does not use HTM).
2202 * The functions posix_spawn_file_actions_addchdir_np and
2203 posix_spawn_file_actions_addfchdir_np have been added, enabling
2204 posix_spawn and posix_spawnp to run the new process in a different
2205 directory. These functions are GNU extensions. The function
2206 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2209 * The popen and system do not run atfork handlers anymore (BZ#17490).
2210 Although it is a possible POSIX violation, the POSIX rationale in
2211 pthread_atfork documentation regarding atfork handlers is to handle
2212 inconsistent mutex state after a fork call in a multi-threaded process.
2213 In both popen and system there is no direct access to user-defined mutexes.
2215 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2216 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2218 - C-SKY ABIV2 soft-float little-endian
2219 - C-SKY ABIV2 hard-float little-endian
2221 * strftime's default formatting of a locale's alternative year (%Ey)
2222 has been changed to zero-pad the year to a minimum of two digits,
2223 like "%y". This improves the display of Japanese era years during
2224 the first nine years of a new era, and is expected to be harmless
2225 for all other locales (only Japanese locales regularly have
2226 alternative year numbers less than 10). Zero-padding can be
2227 overridden with the '_' or '-' flags (which are GNU extensions).
2229 * As a GNU extension, the '_' and '-' flags can now be applied to
2230 "%EY" to control how the year number is formatted; they have the
2231 same effect that they would on "%Ey".
2233 Deprecated and removed features, and other changes affecting compatibility:
2235 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2236 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2238 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2239 in <sys/procfs.h>, has been corrected to match the type actually used by
2240 the Linux kernel. This affects the size and layout of that structure on
2241 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2243 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2244 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2245 defined in <sys/procfs.h>, has been corrected to match the type actually
2246 used by the Linux kernel. This affects the size and layout of those
2249 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2250 meant to scan a string and allocate space for it with malloc, is now
2251 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2252 defined. This extension conflicts with C99's use of '%a' to scan a
2253 hexadecimal floating-point number, which is now available to programs
2254 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2256 POSIX.1-2008 includes the feature of allocating a buffer for string input
2257 with malloc, using the modifier letter 'm' instead. Programs using
2258 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2259 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2260 C99 '%a' no longer need to avoid _GNU_SOURCE.
2262 GCC's -Wformat warnings can detect most uses of this extension, as long
2263 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2264 __attribute__ ((format (scanf, ...))).
2266 Changes to build and runtime requirements:
2268 * Python 3.4 or later is required to build the GNU C Library.
2270 * On most architectures, GCC 5 or later is required to build the GNU C
2271 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2273 Older GCC versions and non-GNU compilers are still supported when
2274 compiling programs that use the GNU C Library.
2276 Security related changes:
2278 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2279 denial of service due to resource exhaustion when processing getaddrinfo
2280 calls with crafted host names. Reported by Guido Vranken.
2282 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2283 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2284 happened, accessing the 32-bit size_t value as the full 64-bit register
2285 in the assembly string/memory functions would cause a buffer overflow.
2286 Reported by H.J. Lu.
2288 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2289 addresses with arbitrary trailing characters, potentially leading to data
2290 or command injection issues in applications.
2292 The following bugs are resolved with this release:
2294 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2295 [10496] localedata: 12h time representation in multiple locales faulty
2296 [10797] localedata: it_IT locale numeric does not have a separator for
2298 [11319] libc: dprintf doesn't handle errors properly
2299 [16346] time: mktime: potentially unsafe use of localtime_offset
2300 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2302 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2303 posix_spawn_file_actions_addfchdir_np
2304 [17426] localedata: Indian locales: set the correct date format
2305 [17490] stdio: popen should not invoke atfork handlers
2306 [17783] libc: TIOCSER_TEMT conditions inconsistent
2307 [18040] regex: use-after-free in regexec/get_subexp
2308 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2309 [20018] network: getaddrinfo should reject IP addresses with trailing
2310 characters (CVE-2016-10739)
2311 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2312 [20271] libc: Missing "\n" in __libc_fatal calls
2313 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2314 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2315 pointer argument is non-NULL
2316 [21037] stdio: open_memstream and freopen
2317 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2318 [21716] time: Crash in glibc's mktime in low-memory situations
2319 [22834] stdio: Subprocess forked by popen may crash in Linux when
2320 multithreads call popen
2321 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2322 and pthread_create fails.
2323 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2324 [23125] libc: riscv64: endless loop when throwing an exception from a
2326 [23275] nptl: Race in pthread_mutex_lock while promoting to
2327 PTHREAD_MUTEX_ELISION_NP.
2328 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2330 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2332 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2334 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2335 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2337 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2338 [23521] nss: get_next_alias nss_files file stream leak
2339 [23538] nptl: Hang in pthread_cond_broadcast
2340 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2341 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2342 [23579] libc: Errors misreported in preadv2
2343 [23597] build: support/test-container.c doesn't work with different
2345 [23603] time: mktime signed integer overflow on large timestamps
2346 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2347 [23614] libc: powerpc: missing CFI register information in __mpn_*
2349 [23637] string: Generic strstr/strcasestr fails with huge needles
2350 [23640] libc: no way to easily clear FD_CLOEXEC in
2351 posix_spawn_file_actions_adddup2()
2352 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2354 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2356 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2357 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2358 bits/types/struct_rusage.h
2359 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2361 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2363 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2364 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2365 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2367 [23724] localedata: Albanian date formats are incorrect
2368 [23735] math: libnldbl_nonshared.a references internal libm symbols
2369 [23740] localedata: kl_GL: Month names and date formats need update
2370 [23744] regex: regex refactorings to remove BE, avoid duplication
2371 [23745] time: mktime fix for Gnulib + coreutils
2372 [23758] time: Improve the width of alternate representation for year in
2374 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2375 [23789] time: mktime does not set errno on failure
2376 [23791] localedata: Wrong monetary format for ca_ES locale
2377 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2378 [23794] locale: c16rtomb does not handle surrogate pairs
2379 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2380 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2381 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2382 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2383 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2384 [23862] libc: [sh] missing kernel-features.h undefines
2385 [23864] libc: [riscv] missing kernel-features.h undefines
2386 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2387 [23907] malloc: Incorrect double-free malloc tcache check disregards
2389 [23913] libc: off-by-one in function maybe_script_execute in
2390 sysdeps/posix/spawni.c
2391 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2392 [23923] locale: Add --no-hard-links option to localedef
2393 [23927] network: Linux if_nametoindex() does not close descriptor
2395 [23961] math: powf can overflow to inf without setting errno in non-
2396 nearest rounding mode
2397 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2398 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2399 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2400 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2401 [24011] localedata: Fixed small type in comment for locale bs_BA
2402 [24018] libc: gettext() may return NULL
2403 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2404 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2405 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2407 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2408 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2410 [24046] localedata: en_US locale doesn't define date_fmt
2411 [24063] manual: @var{errno} should be @code{errno}
2412 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2413 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2415 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2417 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2419 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2421 [24112] network: Do not send DNS queries for non-host names (where all
2422 answers will be rejected)
2423 [24130] libc: alpha __remqu corrupts $f3 register
2430 * The localization data for ISO 14651 is updated to match the 2016
2431 Edition 4 release of the standard, this matches data provided by
2432 Unicode 9.0.0. This update introduces significant improvements to the
2433 collation of Unicode characters. This release deviates slightly from
2434 the standard in that the collation element ordering for lowercase and
2435 uppercase LATIN script characters is adjusted to ensure that regular
2436 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2437 is not matched by [a-z]. With the update many locales have been
2438 updated to take advantage of the new collation information. The new
2439 collation information has increased the size of the compiled locale
2440 archive or binary locales.
2442 * The GNU C Library can now be compiled with support for Intel CET, AKA
2443 Intel Control-flow Enforcement Technology. When the library is built
2444 with --enable-cet, the resulting glibc is protected with indirect
2445 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2446 compatible with all existing executables and shared libraries. This
2447 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2448 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2449 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2450 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2451 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2452 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2455 * The GNU C Library now has correct support for ABSOLUTE symbols
2456 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2457 relocated incorrectly or in some cases discarded. The GNU linker can
2458 make use of the newer semantics, but it must communicate it to the
2459 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2460 field) to indicate such support is required.
2462 * Unicode 11.0.0 Support: Character encoding, character type info, and
2463 transliteration tables are all updated to Unicode 11.0.0, using
2464 generator scripts contributed by Mike FABIAN (Red Hat).
2466 * <math.h> functions that round their results to a narrower type are added
2467 from TS 18661-1:2014 and TS 18661-3:2015:
2469 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2470 fMxaddfNx functions.
2472 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2473 fMxsubfNx functions.
2475 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2476 fMxmulfNx functions.
2478 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2479 fMxdivfNx functions.
2481 * Two grammatical forms of month names are now supported for the following
2482 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2483 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2484 support two grammatical forms in abbreviated month names: Catalan, Greek,
2487 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2488 include the support for two grammatical forms of month names.
2490 * Building and running on GNU/Hurd systems now works without out-of-tree
2493 * The renameat2 function has been added, a variant of the renameat function
2494 which has a flags argument. If the flags are zero, the renameat2 function
2495 acts like renameat. If the flag is not zero and there is no kernel
2496 support for renameat2, the function will fail with an errno value of
2497 EINVAL. This is different from the existing gnulib function renameatu,
2498 which performs a plain rename operation in case of a RENAME_NOREPLACE
2499 flags and a non-existing destination (and therefore has a race condition
2500 that can clobber the destination inadvertently).
2502 * The statx function has been added, a variant of the fstatat64
2503 function with an additional flags argument. If there is no direct
2504 kernel support for statx, glibc provides basic stat support based on
2505 the fstatat64 function.
2507 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2508 library if installed. libidn2 version 2.0.5 or later is recommended. If
2509 libidn2 is not available, internationalized domain names are not encoded
2510 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2511 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2512 with an encoding error.) Flags which used to change the IDN encoding and
2513 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2514 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2515 deprecated. They no longer have any effect.
2517 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2518 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2519 range of ELF gABI expressions including such constructs as
2520 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2521 have been further restricted, and where in the past a dynamic string
2522 token sequence may have been interpreted as a literal string it will
2523 now cause a load failure. These load failures were always considered
2524 unspecified behaviour from the perspective of the dynamic loader, and
2525 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2526 results in a load failure now.
2528 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2529 implementation includes all the standard functions provided by
2532 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2533 thrd_detach, thrd_exit, and thrd_join for thread management.
2535 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2536 mtx_destroy for mutual exclusion.
2538 - call_once for function call synchronization.
2540 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2541 cnd_wait for conditional variables.
2543 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2545 Application developers must link against libpthread to use ISO C threads.
2547 Deprecated and removed features, and other changes affecting compatibility:
2549 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2550 installed. Software that was using either header should be updated to
2551 use standard <stdio.h> interfaces instead.
2553 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2554 This was never required by the C standard, and the macros just expanded
2555 to call alternative names for the same functions. If you hoped getc and
2556 putc would provide performance improvements over fgetc and fputc, instead
2557 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2558 necessary, flockfile and funlockfile.
2560 * All stdio functions now treat end-of-file as a sticky condition. If you
2561 read from a file until EOF, and then the file is enlarged by another
2562 process, you must call clearerr or another function with the same effect
2563 (e.g. fseek, rewind) before you can read the additional data. This
2564 corrects a longstanding C99 conformance bug. It is most likely to affect
2565 programs that use stdio to read interactive input from a terminal.
2568 * The macros 'major', 'minor', and 'makedev' are now only available from
2569 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2570 headers that happen to include <sys/types.h>. These macros are rarely
2571 used, not part of POSIX nor XSI, and their names frequently collide with
2572 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2573 further explanation.
2575 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2576 these macros should first include <sys/types.h>, and then include
2577 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2579 * The tilegx*-*-linux-gnu configurations are no longer supported.
2581 * The obsolete function ustat is no longer available to newly linked
2582 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2583 function has been deprecated in favor of fstatfs and statfs.
2585 * The obsolete function nfsservctl is no longer available to newly linked
2586 binaries. This function was specific to systems using the Linux kernel
2587 and could not usefully be used with the GNU C Library on systems with
2588 version 3.1 or later of the Linux kernel.
2590 * The obsolete function name llseek is no longer available to newly linked
2591 binaries. This function was specific to systems using the Linux kernel
2592 and was not declared in a header. Programs should use the lseek64 name
2593 for this function instead.
2595 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2596 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2597 previously selected by them is now always enabled.
2599 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2600 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2601 restriction (rejecting '_' in host names, among other things) has been
2602 removed, for increased compatibility with non-IDN name resolution.
2604 * The fcntl function now have a Long File Support variant named fcntl64. It
2605 is added to fix some Linux Open File Description (OFD) locks usage on non
2606 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2607 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2608 locks act as a cancellation entrypoint.
2610 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2611 ecb_crypt, and des_setparity are no longer available to newly linked
2612 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2613 longer installed. These functions encrypted and decrypted data with the
2614 DES block cipher, which is no longer considered secure. Software that
2615 still uses these functions should switch to a modern cryptography library,
2618 * Reflecting the removal of the encrypt and setkey functions above, the
2619 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2620 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2623 * The obsolete function fcrypt is no longer available to newly linked
2624 binaries. It was just another name for the standard function crypt,
2625 and it has not appeared in any header file in many years.
2627 * We have tentative plans to hand off maintenance of the passphrase-hashing
2628 library, libcrypt, to a separate development project that will, we hope,
2629 keep up better with new passphrase-hashing algorithms. We will continue
2630 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2631 'crypt_r' should not need to change at all; however, distributions will
2632 need to install <crypt.h> and libcrypt from a separate project.
2634 In this release, if the configure option --disable-crypt is used, glibc
2635 will not install <crypt.h> or libcrypt, making room for the separate
2636 project's versions of these files. The plan is to make this the default
2637 behavior in a future release.
2639 Changes to build and runtime requirements:
2641 GNU make 4.0 or later is now required to build glibc.
2643 Security related changes:
2645 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2646 been fixed by removing the glibc-internal IDNA implementation and using
2647 the system-provided libidn2 library instead. Originally reported by Hanno
2648 Böck and Christian Weisgerber.
2650 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2651 architecture could corrupt memory. Reported by Max Horn.
2653 CVE-2018-11236: Very long pathname arguments to realpath function could
2654 result in an integer overflow and buffer overflow. Reported by Alexey
2657 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2658 architecture could write beyond the target buffer, resulting in a buffer
2659 overflow. Reported by Andreas Schwab.
2661 The following bugs are resolved with this release:
2663 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2664 [6889] manual: 'PWD' mentioned but not specified
2665 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2666 when __WORDSIZE != 64
2667 [13762] regex: re_search etc. should return -2 on memory exhaustion
2668 [13888] build: /tmp usage during testing
2669 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2670 [14092] nptl: Support C11 threads
2671 [14095] localedata: Review / update collation data from Unicode / ISO
2673 [14508] libc: -Wformat warnings
2674 [14553] libc: Namespace pollution loff_t in sys/types.h
2675 [14890] libc: Make NT_PRFPREG canonical.
2676 [15105] libc: Extra PLT references with -Os
2677 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2679 [16335] manual: Feature test macro documentation incomplete and out of
2681 [16552] libc: Unify umount implementations in terms of umount2
2682 [17082] libc: htons et al.: statement-expressions prevent use on global
2683 scope with -O1 and higher
2684 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2685 [17438] localedata: pt_BR: wrong d_fmt delimiter
2686 [17662] libc: please implement binding for the new renameat2 syscall
2687 [17721] libc: __restrict defined as /* Ignore */ even in c11
2688 [17979] libc: inconsistency between uchar.h and stdint.h
2689 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2690 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2691 horrible machine code)
2692 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2694 [18471] libc: llseek should be a compat symbol
2695 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2697 [18991] nss: nss_files skips large entry in database
2698 [19239] libc: Including stdlib.h ends up with macros major and minor being
2700 [19463] libc: linknamespace failures when compiled with -Os
2701 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2702 [19527] locale: Normalized charset name not recognized by setlocale
2703 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2704 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2706 [19728] network: out of bounds stack read in libidn function
2707 idna_to_ascii_4i (CVE-2016-6261)
2708 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2709 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2710 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2712 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2713 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2714 [20419] dynamic-link: files with large allocated notes crash in
2716 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2717 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2718 [20980] manual: CFLAGS environment variable replaces vital options
2719 [21163] regex: Assertion failure in pop_fail_stack when executing a
2720 malformed regexp (CVE-2015-8985)
2721 [21234] manual: use of CFLAGS makes glibc detect no optimization
2722 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2723 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2724 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2725 [21508] locale: intl/tst-gettext failure with latest msgfmt
2726 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2727 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2728 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2730 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2732 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2733 [22247] network: Integer overflow in the decode_digit function in
2734 puny_decode.c in libidn (CVE-2017-14062)
2735 [22342] nscd: NSCD not properly caching netgroup
2736 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2737 [22550] localedata: es_ES locale (and other es_* locales): collation
2738 should treat ñ as a primary different character, sync the collation
2739 for Spanish with CLDR
2740 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2741 by gcc configured with --enable-default-pie
2742 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2743 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2744 crossing 2GB threshold (CVE-2017-18269)
2745 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2747 [22735] time: Misleading typo in time.h source comment regarding
2749 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2750 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2751 `__assert_perror_fail ()' to `__assert_fail_base ()'
2752 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2754 [22786] libc: Stack buffer overflow in realpath() if input size is close
2755 to SSIZE_MAX (CVE-2018-11236)
2756 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2757 through an absolute DT_NEEDED path
2758 [22792] build: tcb-offsets.h dependency dropped
2759 [22797] libc: pkey_get() uses non-reserved name of argument
2760 [22807] libc: PTRACE_* constants missing for powerpc
2761 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2762 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2763 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2764 [22848] localedata: ca_ES: update date definitions from CLDR
2765 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2766 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2767 [22896] localedata: Update locale data for an_ES
2768 [22902] math: float128 test failures with GCC 8
2769 [22918] libc: multiple common of `__nss_shadow_database'
2770 [22919] libc: sparc32: backtrace yields infinite backtrace with
2772 [22926] libc: FTBFS on powerpcspe
2773 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2775 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2776 [22947] libc: FAIL: misc/tst-preadvwritev2
2777 [22963] localedata: cs_CZ: Add alternative month names
2778 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2779 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2780 [22998] dynamic-link: execstack tests are disabled when SELinux is
2782 [23005] network: Crash in __res_context_send after memory allocation
2784 [23007] math: strtod cannot handle -nan
2785 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2786 [23036] regex: regex equivalence class regression
2787 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2788 [23069] libc: sigaction broken on riscv64-linux-gnu
2789 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2790 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2791 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2792 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2793 and libc build with -Os)
2794 [23140] localedata: More languages need two forms of month names
2795 [23145] libc: _init/_fini aren't marked as hidden
2796 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2797 [23171] math: C++ iseqsig for long double converts arguments to double
2798 [23178] nscd: sudo will fail when it is run in concurrent with commands
2799 that changes /etc/passwd
2800 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2802 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2803 [23208] localedata: New locale - Lower Sorbian (dsb)
2804 [23233] regex: Memory leak in build_charclass_op function in file
2806 [23236] stdio: Harden function pointers in _IO_str_fields
2807 [23250] nptl: Offset of __private_ss differs from GCC
2808 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2809 -mtune=generic -mfpmath=sse
2810 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2812 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2813 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2815 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2816 [23277] math: nan function should not have const attribute
2817 [23279] math: scanf and strtod wrong for some hex floating-point
2818 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2820 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2821 [23303] build: undefined reference to symbol
2822 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2823 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2825 [23313] stdio: libio vtables validation and standard file object
2827 [23329] libc: The __libc_freeres infrastructure is not properly run across
2829 [23349] libc: Various glibc headers no longer compatible with
2831 [23351] malloc: Remove unused code related to heap dumps and malloc
2833 [23363] stdio: stdio-common/tst-printf.c has non-free license
2834 [23396] regex: Regex equivalence regression in single-byte locales
2835 [23422] localedata: oc_FR: More updates of locale data
2836 [23442] build: New warning with GCC 8
2837 [23448] libc: Out of bounds access in IBM-1390 converter
2838 [23456] libc: Wrong index_cpu_LZCNT
2839 [23458] build: tst-get-cpu-features-static isn't added to tests
2840 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2842 [23467] dynamic-link: x86/CET: A property note parser bug
2849 * The GNU C Library can now be compiled with support for building static
2850 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2851 executables are like static executables but can be loaded at any address
2852 and provide additional security hardening benefits at the cost of some
2853 memory and performance. When the library is built with --enable-static-pie
2854 the resulting libc.a is usable with GCC 8 and above to create static PIE
2855 executables using the GCC option '-static-pie'. This feature is currently
2856 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2857 aarch64 with binutils 2.30 or later.
2859 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2860 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2863 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2865 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2867 * In order to support faster and safer process termination the malloc API
2868 family of functions will no longer print a failure address and stack
2869 backtrace after detecting heap corruption. The goal is to minimize the
2870 amount of work done after corruption is detected and to avoid potential
2871 security issues in continued process execution. Reducing shutdown time
2872 leads to lower overall process restart latency, so there is benefit both
2873 from a security and performance perspective.
2875 * The abort function terminates the process immediately, without flushing
2876 stdio streams. Previous glibc versions used to flush streams, resulting
2877 in deadlocks and further data corruption. This change also affects
2878 process aborts as the result of assertion failures.
2880 * On platforms where long double has the IEEE binary128 format (aarch64,
2881 alpha, mips64, riscv, s390 and sparc), the math library now implements
2882 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2883 These are the same interfaces added in version 2.26 for some platforms where
2884 this format is supported but is not the format of long double.
2886 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2887 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2888 implements interfaces for that type, as defined by ISO/IEC TS
2889 18661-3:2015. These are corresponding interfaces to those supported for
2892 * The math library now implements interfaces for the _Float32, _Float64 and
2893 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2894 corresponding interfaces to those supported for _Float128.
2896 * glibc now implements the memfd_create and mlock2 functions on Linux.
2898 * Support for memory protection keys was added. The <sys/mman.h> header now
2899 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2902 * The copy_file_range function was added.
2904 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2906 * The ldconfig utility now processes `include' directives using the C/POSIX
2907 collation ordering. Previous glibc versions used locale-specific
2908 ordering, the change might break systems that relied on that.
2910 * Support for two grammatical forms of month names has been added.
2911 In a call to strftime, the "%B" and "%b" format specifiers will now
2912 produce the grammatical form required when the month is used as part
2913 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2914 required when the month is named by itself. For instance, in Greek
2915 and in many Slavic and Baltic languages, "%B" will produce the month
2916 in genitive case, and "%OB" will produce the month in nominative case.
2918 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2919 are all valid and will all accept any known form of month
2920 name---standalone or complete, abbreviated or full. In a call to
2921 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2922 the strings used by "%B" and "%b", respectively. New query
2923 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2924 used by "%OB" and "%Ob", respectively.
2926 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2927 define the strings for %OB and %Ob, respectively; these have the
2928 same syntax as "mon" and "abmon". These arrays are optional; if they
2929 are not provided then they have the same content as "mon" and "abmon",
2932 These features are provided for locales which define "alt_mon" and/or
2933 "ab_alt_mon" in their locale source data. This release includes such
2934 alternative month name data for the following languages: Belarusian,
2935 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2937 This feature is currently a GNU extension, but it is expected to
2938 be added to the next revision of POSIX, and it is also already
2939 available on some BSD-derived operating systems.
2941 This feature will cause existing statically compiled applications
2942 to fail to load locales and fall back to the builtin C/POSIX locales.
2943 See notes below for other changes affecting compatibility.
2945 * Support for the RISC-V ISA running on Linux has been added. This port
2946 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2947 for the following ISA and ABI pairs:
2953 Deprecated and removed features, and other changes affecting compatibility:
2955 * Statically compiled applications attempting to load locales compiled for the
2956 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2957 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2958 support for two grammatical forms of the month names, also extends the locale
2959 data binary format. Static applications needing locale support must be
2960 recompiled to match the runtime and data they are deployed with. In some
2961 distributions there is an upgrade window where dynamically linked applications
2962 may use a new library but the old locale data and also fall back to the
2963 builtin C/POSIX locales; restarting the application process is sufficient to
2966 * Support for statically linked applications which call dlopen is deprecated
2967 and will be removed in a future version of glibc. Applications which call
2968 dlopen need to be linked dynamically instead.
2970 * Support for old programs which use internal stdio data structures and
2971 functions is deprecated. This includes programs which use the C++ streams
2972 provided by libstdc++ in GCC 2.95. Programs which use the internal
2973 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2974 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2975 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2976 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2977 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2978 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2979 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2980 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2981 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2982 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2983 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2984 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2985 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2986 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2987 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2988 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2989 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2990 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2991 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2992 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2993 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2994 future version of glibc. Unlike other symbol removals, these old
2995 applications will not be supported using compatibility symbols.
2997 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2998 defined by <sys/ptrace.h>.
3000 * libm no longer supports SVID error handling (calling a user-provided
3001 matherr function on error) or the _LIB_VERSION variable to control error
3002 handling. (SVID error handling and the _LIB_VERSION variable still work
3003 for binaries linked against older versions of the GNU C Library.) The
3004 libieee.a library is no longer provided. math.h no longer defines struct
3005 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
3006 TLOSS, PLOSS and HUGE.
3008 * The libm functions pow10, pow10f and pow10l are no longer supported for
3009 new programs. Programs should use the standard names exp10, exp10f and
3010 exp10l for these functions instead.
3012 * The mcontext_t type is no longer the same as struct sigcontext. On
3013 platforms where it was previously the same, this changes the C++ name
3014 mangling for interfaces involving this type.
3016 * The add-ons mechanism for building additional packages at the same time as
3017 glibc has been removed. The --enable-add-ons configure option is now
3020 * The --without-fp configure option is now ignored. Whether hardware
3021 floating-point instructions are used is now configured based on whether
3022 the compiler used at configure time (without any options implied by a
3023 --with-cpu= configure option) uses such instructions.
3025 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
3026 the specified string can be parsed as a domain name.
3028 * In the malloc_info output, the <heap> element may contain another <aspace>
3029 element, "subheaps", which contains the number of sub-heaps.
3031 * The libresolv function p_secstodate is no longer supported for new
3034 * The tilepro-*-linux-gnu configuration is no longer supported.
3036 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3037 and will be removed in a future release. Software that is still using
3038 either header should be updated to use standard <stdio.h> interfaces
3041 libio.h was originally the header for a set of supported GNU extensions,
3042 but they have not been maintained as such in many years, they are now
3043 standing in the way of improvements to stdio, and we don't think there are
3044 any remaining external users. _G_config.h was never intended for public
3045 use, but predates the bits convention.
3047 Changes to build and runtime requirements:
3049 * bison version 2.7 or later is required to generate code in the 'intl'
3052 Security related changes:
3054 CVE-2009-5064: The ldd script would sometimes run the program under
3055 examination directly, without preventing code execution through the
3056 dynamic linker. (The glibc project disputes that this is a security
3057 vulnerability; only trusted binaries must be examined using the ldd
3060 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3061 suffered from a one-byte overflow during ~ operator processing (either
3062 on the stack or the heap, depending on the length of the user name).
3063 Reported by Tim Rühsen.
3065 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3066 would sometimes fail to free memory allocated during ~ operator
3067 processing, leading to a memory leak and, potentially, to a denial
3070 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3071 without GLOB_NOESCAPE, could write past the end of a buffer while
3072 unescaping user names. Reported by Tim Rühsen.
3074 CVE-2017-17426: The malloc function, when called with an object size near
3075 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3076 instead of NULL. This was a regression introduced with the new malloc
3077 thread cache in glibc 2.26. Reported by Iain Buclaw.
3079 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3080 to the allocation of too much memory. (This is not a security bug per se,
3081 it is mentioned here only because of the CVE assignment.) Reported by
3084 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3085 of the number of search path components. (This is not a security
3086 vulnerability per se because no trust boundary is crossed if the fix for
3087 CVE-2017-1000366 has been applied, but it is mentioned here only because
3088 of the CVE assignment.) Reported by Qualys.
3090 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3091 for AT_SECURE or SUID binaries could be used to load libraries from the
3094 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3095 succeeds without returning an absolute path due to unexpected behaviour
3096 of the Linux kernel getcwd syscall. Reported by halfdog.
3098 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3099 an object size near the value of SIZE_MAX, would return a pointer to a
3100 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3102 CVE-2018-6551: The malloc function, when called with an object size near
3103 the value of SIZE_MAX, would return a pointer to a buffer which is too
3104 small, instead of NULL.
3106 The following bugs are resolved with this release:
3108 [866] glob: glob should match dangling symlinks
3109 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3110 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3112 [5997] math: Very slow execution of sinf function
3113 [10580] localedata: hr_HR: updated locale
3114 [10871] locale: 'mon' array should contain both nominative and genitive
3116 [12349] localedata: eu_ES: incorrect thousands separator
3117 [13605] localedata: shn_MM: new Shan locale
3118 [13805] localedata: ru_RU: currency should use ',' as radix point
3119 [13953] localedata: km_KH: locale update
3120 [13994] localedata: mjw_IN: new locale
3121 [14121] build: make writes .mo files in po directory
3122 [14333] libc: Fix the race between atexit() and exit()
3123 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3124 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3126 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3127 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3128 width Latin characters
3129 [15332] localedata: es_CU: locale update
3130 [15436] stdio: Don't close or flush stdio streams on abort
3131 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3133 [16148] localedata: ca_ES: incorrect thousands separator
3134 [16750] dynamic-link: ldd should not try to execute the binaries
3136 [16777] localedata: pl_PL: incorrect thousands separator in locale
3137 [16905] localedata: hanzi: new collation
3138 [17563] localedata: cmn_TW: add hanzi collation
3139 [17750] localedata: wrong collation order of diacritics in most locales
3140 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3142 [17956] build: Build fails on missing definitions from header file
3143 nss/nss.h when Mozilla NSS is used for cryptography
3144 [18203] libc: realpath() does not handle unreachable paths correctly
3145 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3146 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3147 [18822] libc: Internal functions are called via PLT
3148 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3149 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3150 [19574] libc: glibc should support building static PIE binaries
3151 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3153 [19971] glob: glob: Do not skip entries with zero d_ino values
3154 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3155 [20008] localedata: km_KH: convert to translit_neutral
3156 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3157 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3158 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3159 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3160 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3162 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3163 they're set, wrong errors returned by gaih_inet when lookup functions
3165 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3166 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3168 [20952] localedata: yuw_PG: new locale
3169 [21084] localedata: charmaps/IBM858: new codepage
3170 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3171 [21242] libc: assert gives pedantic warning in old gcc versions
3172 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3173 __regcall calling convention
3174 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3175 [21326] libc: C99 functions are not declared for C++11 and later if
3176 _GNU_SOURCE is not predefined by g++
3177 [21457] libc: sys/ucontext.h namespace
3178 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3179 [21660] math: GCC fails to compile a formula with tgmath.h
3180 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3181 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3182 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3183 [21684] math: tgmath.h handling of complex integers
3184 [21685] math: tgmath.h handling of bit-fields
3185 [21686] math: tgmath.h handling of __int128
3186 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3188 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3190 [21750] localedata: column width of characters incompatible with classical
3192 [21754] malloc: malloc: Perform as little work as possible after heap
3193 consistency check failures
3194 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3195 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3196 [21791] string: Unused XXX_chk_XXX functions in libc.a
3197 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3199 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3201 [21845] localedata: Added new Locale bho_NP
3202 [21853] localedata: Fix abday Which looks same as day in zh_SG
3203 [21854] localedata: Added New Locale en_SC
3204 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3205 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3206 _dl_runtime_resolve_avx_slow
3207 [21885] network: getaddrinfo: gethosts does not release resolver context
3208 on memory allocation failure
3209 [21899] libc: XPG4.2 sigaction namespace
3210 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3212 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3214 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3215 errno value, causing getaddrinfo to fail
3216 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3217 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3218 instead of EAI_NODATA
3219 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3220 constant PTRACE_SEIZE_DEVEL
3221 [21930] math: C-only gcc builtins used in <math.h> isinf
3222 [21932] network: Unpaired __resolv_context_get in generic get*_r
3224 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3225 [21944] libc: sigval namespace
3226 [21951] localedata: Update hanzi collation by stroke
3227 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3228 sysdeps/x86_64/fpu/e_expf.S
3229 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3230 allocation in syscall loops)
3231 [21959] localedata: Fix Country name for xh_ZA
3232 [21960] localedata: Fix abmon for bem_ZM
3233 [21966] math: AVX2 mathvec functions use FMA without checking
3234 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3235 [21971] localedata: Added New Locale for mfe_MU
3236 [21972] libc: assert macro requires operator== (int) for its argument type
3237 [21973] math: [sparc] libm missing sqrtl compat symbol
3238 [21974] libc: Remove __bb_init_func and __bb_exit_func
3239 [21982] string: stratcliff.c: error: assuming signed overflow does not
3241 [21986] stdio: __guess_grouping is called incorrectly
3242 [21987] math: [sparc32] wrong bits/long-double.h installed
3243 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3245 [22022] localedata: Missing country_name for mni_IN
3246 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3248 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3250 [22026] locale: iconv_open: heap overflow on gconv_init failure
3251 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3252 [22035] math: [m68k] bits/math-inline.h macro namespace
3253 [22038] localedata: Fix abbreviated weeks and months for Somali
3254 [22044] localedata: Remove redundant data for Limburgish Language
3255 [22050] malloc: Linking with -lmcheck does not hook
3256 __malloc_initialize_hook correctly
3257 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3258 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3259 [22070] localedata: charmaps/UTF-8: wcwidth for
3260 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3261 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3262 Jungseong and Jongseong) should be 0
3263 [22078] nss: nss_files performance issue in multi mode
3264 [22082] math: bits/math-finite.h exp10 condition
3265 [22086] libc: pcprofiledump incorrect cross-endian condition
3266 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3267 [22095] network: Name server address allocation memory leak in resolv.conf
3269 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3271 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3272 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3274 [22111] malloc: malloc: per thread cache is not returned when thread exits
3275 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3276 [22134] libc: [linux] implement fexecve with execveat
3277 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3279 [22145] libc: ttyname() gives up too early in the face of namespaces
3280 [22146] math: C++ build issue with float128 on x86_64
3281 [22153] nptl: nptl: save error code before process termination
3282 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3283 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3284 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3285 [22165] libc: [hppa] Text relocations in libc.so
3286 [22180] libc: destructor registered via __cxa_atexit is called twice
3287 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3288 symlinks") cause "make" segfaults
3289 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3291 [22207] libc: FAIL: stdlib/test-atexit-race
3292 [22225] math: nearbyint arithmetic moved before feholdexcept
3293 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3294 [22235] math: iscanonical in C++ and float128
3295 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3296 the svid compat wrapper
3297 [22244] math: ynf and yn are wrong without the svid compat wrapper
3298 [22273] libc: Improper assert in Linux posix_spawn implementation
3299 [22284] libc: -pg -pie doesn't work
3300 [22292] locale: localedef exits with error 4 when it should be error 1
3301 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3302 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3304 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3305 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3307 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3308 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3309 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3310 [22322] libc: [mips64] wrong bits/long-double.h installed
3311 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3312 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3314 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3315 [22343] malloc: Integer overflow in posix_memalign
3316 [22347] libc: getrandom() returns the number of bytes that were copied to
3317 the buffer even though the comments say "Return 0 on success and -1 on
3319 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3320 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3322 [22370] dynamic-link: Incorrect note padding check
3323 [22375] libc: malloc returns pointer from tcache_get when should return
3324 NULL (CVE-2017-17426)
3325 [22377] math: iseqsig, float128 and C++
3326 [22382] localedata: Error in tpi_PG locale
3327 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3328 inside the ASCII printable range
3329 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3331 [22403] localedata: Slash needs escaping in some locales
3332 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3333 [22409] network: res_hnok does not accept some host names used on the
3335 [22412] network: res_dnok, res_hnok should perform syntax checks
3336 [22413] network: ns_name_pton ignores syntactically invalid trailing
3338 [22415] stdio: setvbuf can lead to invalid free/segfault
3339 [22432] build: Non-deterministic build
3340 [22439] malloc: malloc_info should compute summary statistics for all sub-
3342 [22442] network: if_nametoindex could report index for the wrong
3343 networking interface
3344 [22446] build: aliasing violation calling readlink in handle_request
3345 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3346 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3347 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3348 __nscd_hash/__nss_hash
3349 [22463] network: p_secstodate overflow handling
3350 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3351 [22478] libc: sigwait can fail with EINTR
3352 [22505] libc: ldconfig processes include directive in locale-specific
3354 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3355 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3356 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3357 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3358 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3359 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3360 same as for Croatian
3361 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3362 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3363 [22577] libc: missing newline after "cannot allocate TLS data structures
3365 [22588] manual: manual/conf.texi: missing underscore in front of
3367 [22593] math: nextafter and nexttoward are declared with const attribute
3368 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3369 [22603] string: ia64 memchr overflows internal pointer check
3370 [22605] libc: SH clone does not set the exit code correctly
3371 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3373 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3374 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3375 modified in case of success
3376 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3377 [22615] manual: manual: ambiguous wording about errno value in case of
3379 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3381 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3382 binaries or if /proc is not mounted (CVE-2017-16997)
3383 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3384 [22630] build: $(no-pie-ldflag) is no longer effective
3385 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3386 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3387 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3388 [22637] nptl: guard size is subtracted from thread stack size instead of
3390 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3391 [22657] localedata: hu_HU: Avoid double space in date
3392 [22660] math: fmax, fmin sNaN handling on alpha
3393 [22664] libc: New warning of GCC8
3394 [22665] math: alpha: ceil and floor raise inexact exceptions
3395 [22666] math: alpha: trunc raise inexact exceptions
3396 [22667] libc: makecontext lacks stack alignment on i386
3397 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3398 [22679] libc: getcwd(3) can succeed without returning an absolute path
3400 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3401 elision and tunables
3402 [22687] math: [powerpc-nofpu] complex long double functions spurious
3404 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3405 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3406 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3408 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3409 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3411 [22701] nis: Incomplete removal of libnsl
3412 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3413 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3414 [22715] dynamic-link: FAIL: elf/tst-audit10
3415 [22719] libc: Backtrace tests fail on hppa
3416 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3417 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3418 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3419 before the first call to crypt_r () in crypt/badsalttest.c
3426 * A per-thread cache has been added to malloc. Access to the cache requires
3427 no locks and therefore significantly accelerates the fast path to allocate
3428 and free small amounts of memory. Refilling an empty cache requires locking
3429 the underlying arena. Performance measurements show significant gains in a
3430 wide variety of user workloads. Workloads were captured using a special
3431 instrumented malloc and analyzed with a malloc simulator. Contributed by
3432 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3434 * Unicode 10.0.0 Support: Character encoding, character type info, and
3435 transliteration tables are all updated to Unicode 10.0.0, using
3436 generator scripts contributed by Mike FABIAN (Red Hat).
3437 These updates cause user visible changes, especially the changes in
3438 wcwidth for many emoji characters cause problems when emoji sequences
3439 are rendered with pango, see for example:
3440 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3442 * Collation of Hungarian has been overhauled and is now consistent with "The
3443 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3446 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3448 - The GNU C Library will now detect when /etc/resolv.conf has been
3449 modified and reload the changed configuration. The new resolver option
3450 “no-reload” (RES_NORELOAD) disables this behavior.
3452 - The GNU C Library now supports an arbitrary number of search domains
3453 (configured using the “search” directive in /etc/resolv.conf);
3454 previously, there was a hard limit of six domains. For backward
3455 compatibility, applications that directly modify the ‘_res’ global
3456 object are still limited to six search domains.
3458 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3459 Library will now randomly pick a name server from the configuration as a
3460 starting point. (Previously, the second name server was always used.)
3462 * The tunables feature is now enabled by default. This allows users to tweak
3463 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3465 * New function reallocarray, which resizes an allocated block (like realloc)
3466 to the product of two sizes, with a guaranteed clean failure upon integer
3467 overflow in the multiplication. Originally from OpenBSD, contributed by
3468 Dennis Wölfing and Rüdiger Sonderfeld.
3470 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3471 These are extended versions of preadv and pwritev, respectively, taking an
3472 additional flags argument. The set of supported flags depends on the
3473 running kernel; full support currently requires kernel 4.7 or later.
3475 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3476 create a new session ID for the spawned process. This feature is
3477 scheduled to be added to the next major revision of POSIX; for the time
3478 being, it is available under _GNU_SOURCE.
3480 * errno.h is now safe to use from C-preprocessed assembly language on all
3481 supported operating systems. In this context, it will only define the
3482 Exxxx constants, as preprocessor macros expanding to integer literals.
3484 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3485 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3486 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3487 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3489 To compile programs that use this feature, the compiler must support
3490 128-bit floating point with the type name _Float128 (as defined by TS
3491 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3492 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3493 must be defined to make the new interfaces visible.
3495 The new functions and macros correspond to those present for other
3496 floating-point types (except for a few obsolescent interfaces not
3497 supported for the new type), with F128 or f128 suffixes; for example,
3498 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3499 printf or scanf formats for the new type; the strfromf128 and strtof128
3500 interfaces should be used instead.
3502 Deprecated and removed features, and other changes affecting compatibility:
3504 * The synchronization that pthread_spin_unlock performs has been changed to
3505 now be equivalent to a C11 atomic store with release memory order to the
3506 spin lock's memory location. Previously, several (but not all)
3507 architectures used stronger synchronization (e.g., containing what is
3508 often called a full barrier). This change can improve performance, but
3509 may affect odd fringe uses of spin locks that depend on the previous
3510 behavior (e.g., using spin locks as atomic variables to try to implement
3511 Dekker's mutual exclusion algorithm).
3513 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3516 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3517 will only be built and installed when the GNU C Library is configured with
3518 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3519 as TIRPC or rpcsvc-proto, to be used.
3521 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3522 libnss_compat, are deprecated, and will not be built or installed by
3525 The NIS(+) support library, libnsl, is also deprecated. By default, a
3526 compatibility shared library will be built and installed, but not headers
3527 or development libraries. Only a few NIS-related programs require this
3528 library. (In particular, the GNU C Library has never required programs
3529 that use 'gethostbyname' to be linked with libnsl.)
3531 Replacement implementations based on TIRPC, which additionally support
3532 IPv6, are available from <https://github.com/thkukuk/>. The configure
3533 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3534 name service modules, to be built and installed.
3536 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3537 support is enabled, the configured recursive resolver must support EDNS.
3538 (Responding to EDNS-enabled queries with responses which are not
3539 EDNS-enabled is fine, but FORMERR responses are not.)
3541 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3542 servers have not supported this opcode for a long time.
3544 * The _res_opcodes variable has been removed from libresolv. It had been
3545 exported by accident.
3547 * <string.h> no longer includes inline versions of any string functions,
3548 as this kind of optimization is better done by the compiler. The macros
3549 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3551 * The nonstandard header <xlocale.h> has been removed. Most programs should
3552 use <locale.h> instead. If you have a specific need for the definition of
3553 locale_t with no other declarations, please contact
3554 libc-alpha@sourceware.org and explain.
3556 * The obsolete header <sys/ultrasound.h> has been removed.
3558 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3560 * The obsolete function cfree has been removed. Applications should use
3563 * The stack_t type no longer has the name struct sigaltstack. This changes
3564 the C++ name mangling for interfaces involving this type.
3566 * The ucontext_t type no longer has the name struct ucontext. This changes
3567 the C++ name mangling for interfaces involving this type.
3569 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3570 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3571 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3572 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3573 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3574 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3575 fpregset_t type no longer has the name struct fpu. This changes the C++
3576 name mangling for interfaces involving those types.
3578 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3579 synced with the kernel:
3581 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3582 are not supported on this architecture and have been removed.
3584 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3585 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3586 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3588 Programs that assume the GET/SETREGS ptrace requests are universally
3589 available will now fail to build, instead of malfunctioning at runtime.
3591 Changes to build and runtime requirements:
3593 * Linux kernel 3.2 or later is required at runtime, on all architectures
3594 supported by that kernel. (This is a change from version 2.25 only for
3597 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3599 * On most architectures, GCC 4.9 or later is required to build the GNU C
3600 Library. On powerpc64le, GCC 6.2 or later is required.
3602 Older GCC versions and non-GNU compilers are still supported when
3603 compiling programs that use the GNU C Library. (We do not know exactly
3604 how old, and some GNU extensions to C may be _de facto_ required. If you
3605 are interested in helping us make this statement less vague, please
3606 contact libc-alpha@sourceware.org.)
3608 Security related changes:
3610 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3611 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3613 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3614 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3616 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3617 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3620 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3621 fixed (CVE-2017-12133).
3623 The following bugs are resolved with this release:
3625 [984] network: Respond to changed resolv.conf in gethostbyname
3626 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3627 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3629 [12189] libc: __stack_chk_fail should not attempt a backtrace
3631 [14096] time: Race condition on timezone/tst-timezone.out
3632 [14172] localedata: az_IR: new locale
3633 [14995] build: glibc fails to build if gold is the default linker, even if
3635 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3636 [16637] network: inet_pton function is accepting IPv6 with bad format
3637 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3638 x86 and other generic code
3639 [16875] localedata: ko_KR: fix lang_name
3640 [17225] localedata: ar_SY: localized month names for May and June are
3642 [17297] localedata: da_DK: wrong date_fmt string
3643 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3644 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3645 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3646 [19066] localedata: ar_SA abbreviated day and month names are in English
3647 [19569] network: resolv: Support an arbitrary number of search domains
3648 [19570] network: Implement random DNS server selection in the stub
3650 [19838] locale: localedef fails on PA-RISC
3651 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3652 order of 0D36 and 0D37
3653 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3655 [20098] libc: FAIL: debug/backtrace-tst on hppa
3656 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3658 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3660 [20313] localedata: Update locale data to Unicode 9.0
3661 [20424] manual: Document how to provide a malloc replacement
3662 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3664 [20686] locale: Add el_GR@euro to SUPPORTED.
3665 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3666 failures consistently
3667 [21015] dynamic-link: Document and fix --enable-bind-now
3668 [21016] nptl: pthread_cond support is broken on hppa
3669 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3670 frame-pointer on i386
3671 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3673 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3674 [21088] libc: Build fails with --enable-static-nss
3675 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3676 generic c code is used
3677 [21109] libc: Tunables broken on big-endian
3678 [21112] math: powf has large ulp errors with base close to 1 and exponent
3680 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3682 [21120] malloc: glibc malloc is incompatible with GCC 7
3683 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3685 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3686 (-0.0) when linking with -lieee
3687 [21171] math: log10, log2 and lgamma return incorrect results
3688 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3689 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3690 [21207] localedata: ce_RU: update weekdays from CLDR
3691 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3692 [21217] localedata: Update months from CLDR-31
3693 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3694 [21243] libc: support_delete_temp_file should issue warning for failed
3696 [21244] libc: support resolv_test_start() socket fd close should be
3698 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3699 new posix_spawn implementation
3700 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3701 leads to lower CPU frequency
3702 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3703 [21261] libc: [sparc64] bits/setjmp.h namespace
3704 [21267] network: [mips] bits/socket.h IOC* namespace
3705 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3706 [21270] libc: mmap64 silently truncates large offset values
3707 [21275] libc: posix_spawn always crashes on ia64 now
3708 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3709 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3710 [21289] libc: Incorrect declaration for 32-bit platforms with
3711 _FILE_OFFSET_BITS=64 causes build error
3712 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3713 not support gethostbyname4_r
3714 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3716 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3718 [21340] libc: Support POSIX_SPAWN_SETSID
3719 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3720 [21359] network: ns_name_pack needs additional byte in destination buffer
3721 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3722 against fragmentation attacks (CVE-2017-12132)
3723 [21369] network: resolv: Remove EDNS fallback
3724 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3726 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3727 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3728 [21393] stdio: Missing dup3 error check in freopen, freopen64
3729 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3730 [21399] localedata: Bad description for U00EC in
3731 localedata/charmaps/CP1254
3732 [21411] malloc: realloc documentation error
3733 [21426] network: sys/socket.h uio.h namespace
3734 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3735 [21445] libc: signal.h bsd_signal namespace
3736 [21455] network: Network headers stdint.h namespace
3737 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3739 [21475] network: resolv: Overlong search path is truncated mid-label
3740 [21511] libc: sigstack namespace
3741 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3742 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3743 bits/syscall.h: No such file or directory
3744 [21517] libc: struct sigaltstack namespace
3745 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3746 [21533] localedata: Update locale data to Unicode 10.0
3748 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3749 junk at end of line, first unrecognized character is `@'
3750 [21538] libc: SIG_HOLD missing for XPG4
3751 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3752 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3753 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3754 [21543] libc: sigevent namespace
3755 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3756 size for general purpose registers in mcontext_t structure
3757 [21550] libc: sigwait namespace
3758 [21552] libc: XPG4 bsd_signal namespace
3759 [21554] libc: sigpause namespace
3760 [21560] libc: sys/wait.h signal.h namespace
3761 [21561] libc: waitid namespace
3762 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3763 '/usr/include/stdlib.h': Permission denied
3764 [21575] libc: sys/wait.h missing struct rusage definition
3765 [21584] libc: sigaltstack etc namespace
3766 [21597] libc: siginterrupt namespace
3767 [21607] math: hppa: FAIL: math/test-tgmath
3768 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3770 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3771 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3772 stack and heap (CVE-2017-1000366)
3773 [21625] libc: wait3 namespace
3774 [21654] nss: Incorrect pointer alignment in NSS group merge result
3776 [21657] network: Parse interface zone id for node-local multicast
3777 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3779 [21666] libc: .symver is used on common symbol
3780 [21668] network: resolv: res_init cross-thread broadcast introduces race
3782 [21687] math: tgmath.h totalorder, totalordermag return type
3783 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3785 [21696] libc: Incorrect assumption of of __cpu_mask in
3786 posix/sched_cpucount.c
3787 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3788 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3790 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3791 leading to relocation crash
3792 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3793 `resolv_conf_matches (resp, conf)' failed.
3794 [21710] localedata: Added Samoan language locale for Samoa
3795 [21711] localedata: Pashto yesstr/nostr locale are missing
3796 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3797 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3798 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3799 [21723] localedata: yesstr/nostr missing for Chinese language locale
3800 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3802 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3804 [21728] localedata: New Locale for Tongan language
3805 [21729] localedata: incorrect LC_NAME fields for hi_IN
3806 [21733] localedata: yesstr and nostr are missing for zh_HK
3807 [21734] localedata: Missing yesstr and nostr are for kw_GB
3808 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3809 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3810 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3811 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3813 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3815 [21749] localedata: Wrong abbreviated day name (“abday”) for
3817 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3818 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3819 [21759] localedata: missing yesstr and nostr for Tigrinya
3820 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3821 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3822 [21767] localedata: Missing Bislama locales
3823 [21768] localedata: Missing yesstr and nostr for aa_ET
3824 [21770] localedata: Missing Field in li_NL
3825 [21778] nptl: Robust mutex may deadlock
3826 [21779] libc: MicroBlaze segfaults when loading libpthread
3827 [21783] localedata: Fix int_select international_call_prefixes
3828 [21784] localedata: Inconsistency in country_isbn
3829 [21788] localedata: Missing Country Postal Abbreviations
3830 [21794] localedata: Added-country_isbn-for-Italy
3831 [21795] localedata: Add/Fix country_isbn for France
3832 [21796] localedata: Added country_isbn for Republic of Korea
3833 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3834 [21799] localedata: Added int_select international_call_prefixes
3835 [21801] localedata: Added int_select international_call_prefixes
3836 [21804] nptl: Double semicolon in thread-shared-types.h
3837 [21807] localedata: LC_ADDRESS fix for pap_CW
3838 [21808] localedata: Fix LC_ADDRESS for pap_AW
3839 [21821] localedata: Added country_name in mai_IN
3840 [21822] localedata: Fix LC_TIME for mai_IN
3841 [21823] localedata: missing yesstr, nostr for sa_IN
3842 [21825] localedata: Fix name_mrs for mag_IN
3843 [21828] localedata: 2.26 changelog should mention user visible changes
3845 [21835] localedata: Added Maithili language locale for Nepal
3846 [21838] localedata: Removed redundant data for the_NP
3847 [21839] localedata: Fix LC_MONETARY for ta_LK
3848 [21844] localedata: Fix Latin characters and Months Sequence.
3849 [21848] localedata: Fix mai_NP Title Name
3854 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3855 24731-2:2010, is supported to enable declarations of functions from that
3856 TR. Note that not all functions from that TR are supported by the GNU C
3859 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3860 18661-1:2014, is supported to enable declarations of functions and macros
3861 from that TS. Note that not all features from that TS are supported by
3864 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3865 18661-4:2015, is supported to enable declarations of functions and macros
3866 from that TS. Note that most features from that TS are not supported by
3869 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3870 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3871 Since the GNU C Library defaults to a much newer revision of POSIX, this
3872 will only affect programs that specifically request an old conformance
3873 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3874 see a change in the visible declarations, but a program compiled with
3875 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3878 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3879 defined by all multithreaded code, but glibc has not required this for
3882 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3883 means that in a future release, the macros “major”, “minor”, and “makedev”
3884 will only be available from <sys/sysmacros.h>.
3886 These macros are not part of POSIX nor XSI, and their names frequently
3887 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3888 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3889 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3892 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3893 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3894 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3896 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3897 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3898 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3899 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3900 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3901 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3902 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3903 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3904 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3905 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3906 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3909 * New <math.h> features are added from TS 18661-1:2014:
3911 - Signaling NaN macros: SNANF, SNAN, SNANL.
3913 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3914 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3915 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3917 - llogb functions: the llogb, llogbf and llogbl functions, and the
3918 FP_LLOGB0 and FP_LLOGBNAN macros.
3920 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3923 - Comparison macros: iseqsig.
3925 - Classification macros: iscanonical, issubnormal, iszero.
3927 - Total order functions: totalorder, totalorderf, totalorderl,
3928 totalordermag, totalordermagf, totalordermagl.
3930 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3932 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3933 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3935 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3936 are added to libc. They convert a floating-point number into string.
3938 * Most of glibc can now be built with the stack smashing protector enabled.
3939 It is recommended to build glibc with --enable-stack-protector=strong.
3940 Implemented by Nick Alcock (Oracle).
3942 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3943 intended to be used instead of memset() to erase sensitive data after use;
3944 the compiler will not optimize out calls to explicit_bzero even if they
3945 are "unnecessary" (in the sense that no _correct_ program can observe the
3946 effects of the memory clear).
3948 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3949 to float instead of double. This does not affect the ABI of any libraries
3950 that are part of the GNU C Library, but may affect the ABI of other
3951 libraries that use this type in their interfaces.
3953 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3954 float_t and double_t types are now defined to long double instead of float
3955 and double. These options are not the default, and this does not affect
3956 the ABI of any libraries that are part of the GNU C Library, but it may
3957 affect the ABI of other libraries that use this type in their interfaces,
3958 if they are compiled or used with those options.
3960 * The getentropy and getrandom functions, and the <sys/random.h> header file
3963 * The buffer size for byte-oriented stdio streams is now limited to 8192
3964 bytes by default. Previously, on Linux, the default buffer size on most
3965 file systems was 4096 bytes (and thus remains unchanged), except on
3966 network file systems, where the buffer size was unpredictable and could be
3967 as large as several megabytes.
3969 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3970 for the Linux quota interface which predates kernel version 2.4.22 has
3973 * The malloc_get_state and malloc_set_state functions have been removed.
3974 Already-existing binaries that dynamically link to these functions will
3975 get a hidden implementation in which malloc_get_state is a stub. As far
3976 as we know, these functions are used only by GNU Emacs and this change
3977 will not adversely affect already-built Emacs executables. Any undumped
3978 Emacs executables, which normally exist only during an Emacs build, should
3979 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3981 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3982 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3983 “no-ip6-dotint” had already been the default, and support for the
3984 “ip6-dotint” option was removed from the Internet in 2006.
3986 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3987 flag from <resolv.h> have been removed. The option relied on a
3988 backwards-incompatible DNS extension which was never deployed on the
3991 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3992 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3993 They were already unimplemented.
3995 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3996 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3997 removed again from the IETF name lookup interface specification in RFC
3998 2553. Applications should use getaddrinfo instead.
4000 * DNSSEC-related declarations and definitions have been removed from the
4001 <arpa/nameser.h> header file, and libresolv will no longer attempt to
4002 decode the data part of DNSSEC record types. Previous versions of glibc
4003 only implemented minimal support for the previous version of DNSSEC, which
4004 is incompatible with the currently deployed version.
4006 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
4007 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
4008 <arpa/nameser.h> header file because the distinction between RR types and
4009 meta-RR types is not officially standardized, subject to revision, and
4010 thus not suitable for encoding in a macro.
4012 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
4013 and rhook members of the res_state type in <resolv.h> have been removed.
4014 The glibc stub resolver did not support these hooks, but the header file
4015 did not reflect that.
4017 * For multi-arch support it is recommended to use a GCC which has
4018 been built with support for GNU indirect functions. This ensures
4019 that correct debugging information is generated for functions
4020 selected by IFUNC resolvers. This support can either be enabled by
4021 configuring GCC with '--enable-gnu-indirect-function', or by
4022 enabling it by default by setting 'default_gnu_indirect_function'
4023 variable for a particular architecture in the GCC source file
4026 * GDB pretty printers have been added for mutex and condition variable
4027 structures in POSIX Threads. When installed and loaded in gdb these pretty
4028 printers show various pthread variables in human-readable form when read
4029 using the 'print' or 'display' commands in gdb.
4031 * Tunables feature added to allow tweaking of the runtime for an application
4032 program. This feature can be enabled with the '--enable-tunables' configure
4033 flag. The GNU C Library manual has details on usage and README.tunables has
4034 instructions on adding new tunables to the library.
4036 * A new version of condition variables functions have been implemented in
4037 the NPTL implementation of POSIX Threads to provide stronger ordering
4040 * A new version of pthread_rwlock functions have been implemented to use a more
4041 scalable algorithm primarily through not using a critical section anymore to
4044 Security related changes:
4046 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4047 have been created with makecontext could fail to terminate due to a
4048 missing .cantunwind annotation. This has been observed to lead to a hang
4049 (denial of service) in some Go applications compiled with gccgo. Reported
4050 by Andreas Schwab. (CVE-2016-6323)
4052 * The DNS stub resolver functions would crash due to a NULL pointer
4053 dereference when processing a query with a valid DNS question type which
4054 was used internally in the implementation. The stub resolver now uses a
4055 question type which is outside the range of valid question type values.
4058 The following bugs are resolved with this release:
4060 [4099] stdio: Overly aggressive caching by stream i/o functions.
4061 [7065] build: Support building glibc with -fstack-protector or -fstack-
4063 [9842] localedata: en_CA: incorrect date format
4064 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4065 before it started waiting
4066 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4067 [15765] nptl: sem_open is wrongly a cancellation point
4068 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4069 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4071 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4072 library linked with pthread
4073 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4074 "FIXME: Ingo" issue)
4075 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4076 [17252] libc: getrandom and getentropy syscall
4077 [17730] malloc: thread-local storage is sometimes improperly free()'d
4078 after being __libc_memalign()'d
4079 [18241] stdio: failed fseek on memstream does not set errno and can fail
4081 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4083 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4084 PTHREAD_PRIO_INHERIT mutex on ARM
4085 [18784] network: res_query and related function crash for special record
4086 type queries (CVE-2015-5180)
4087 [19380] math: strtod does not raise "inexact"
4088 [19387] string: Integer overflow in memchr
4089 [19390] string: Integer overflow in strncat
4090 [19398] build: linknamespace tests fail with massively parallel build
4091 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4093 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4094 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4095 [19514] libc: [PATCH] Fix spelling errors in spelling
4096 "implement"/"implementation" in several places
4097 [19582] network: Deprecate RES_USE_INET6
4098 [19673] manual: clog10 docs appear to be erroneous
4099 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4100 causes a segmentation fault
4101 [19826] libc: invalid pointer returned from __tls_get_addr with static
4103 [20016] network: resolv: Remove hooks support from the API
4104 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4106 [20033] math: [x86_64] vectorized math function don't call the __finite
4108 [20116] nptl: use after free in pthread_create
4109 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4110 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4112 [20311] nptl: please install proc_service.h
4113 [20366] libc: Compilation errors in installed headers in strict-compliance
4115 [20370] malloc: malloc: Arena free list management is still racy
4116 (incorrect fix in bug 19243)
4117 [20386] libc: assert (X = 0) does not result in GCC warning
4118 [20432] malloc: malloc: Minimize interface required for interposition
4119 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4120 in _Unwind_Backtrace (CVE-2016-6323)
4121 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4122 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4124 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4125 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4126 [20477] network: resolv: incorrect double-checked locking related to
4128 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4130 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4132 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4133 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4134 cause transition penalty
4135 [20517] math: sparcv9 missing fdiml compat symbol
4136 [20524] manual: strverscmp is inconsistent
4137 [20525] libc: <sys/quota.h> should be based on kernel headers
4138 [20539] math: GCC 7 -static -lm fails to link at -O3
4139 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4141 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4143 [20591] network: Remove obsolete DNSSEC support
4144 [20592] network: DNS resource record type classification macros in
4145 <arpa/nameser.h> are incorrect
4146 [20593] network: Update DNS RR type definitions
4147 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4148 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4150 [20629] network: libresolv: Remove support for bitstring labels
4152 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4153 assertion: "maxidx >= 2"
4154 [20660] math: [arm] Use VSQRT
4155 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4156 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4157 [20689] libc: Test for FMA should also check for AVX.
4158 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4159 [20715] math: iszero macro breaks existing code
4160 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4161 [20728] libc: powerpc: Missing TOC stub in clone
4162 [20729] build: glibc-2.24 fails to build for i486 with -Os
4163 [20750] build: Build fails with default PIE enabled gcc-6.x
4164 [20768] math: [alpha] sqrt fegetenv namespace
4165 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4167 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4168 __FLT_EVAL_METHOD__ is 2
4169 [20790] network: rpcgen buffer overrun in get_prog_declaration
4170 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4171 [20829] libc: crypt snprintf namespace
4172 [20847] libc: tst-vfork3 failure
4173 [20855] math: Default bits/mathdef.h has inappropriate float_t
4174 [20859] math: [sh4] FP_ILOGB0 invalid
4175 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4176 U+20AC), not same as GBK
4177 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4178 [20916] math: pow handling of sNaN arguments
4179 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4180 [20919] math: Bad pow (qNaN, 0) result with -lieee
4181 [20940] math: hypot sNaN handling
4182 [20947] math: fmax, fmin sNaN handling
4183 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4184 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4186 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4187 [20973] nptl: robust mutexes: Lost wake-ups
4188 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4189 [20978] nis: strlen on null pointer in nss_nisplus
4190 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4192 [21014] string: i686 memchr overflows internal pointer check
4193 [21019] libc: [mips] n32 lseek incorrect on overflow
4194 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4195 [21026] libc: [MIPS] readahead syscall is broken on n64
4196 [21028] math: Fallback fesetexceptflag should always succeed
4197 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4198 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4200 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4201 [21061] librt: [microblaze] librt lost clock_* exports
4202 [21073] libc: tunables: insecure environment variables passed to
4203 subprocesses with AT_SECURE
4204 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4208 * The minimum Linux kernel version that this version of the GNU C Library
4209 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4210 kernel version 2.6.32 or later suffices (on architectures that already
4211 required kernel versions more recent than 3.2, those requirements remain
4212 unchanged). Linux 3.2 or later kernel headers are required on all
4215 * The pap_AN locale has been deleted. This has been deprecated for a long
4216 time. It has been replaced by pap_AW & pap_CW, both of which have long
4217 been included in previous releases.
4219 * The readdir_r and readdir64_r functions have been deprecated. It is
4220 recommended to use readdir and readdir64 instead.
4222 * The type “union wait” has been removed. It was deprecated in the early
4223 1990s and never part of POSIX. Application code should use the int type
4224 instead of “union wait”.
4226 * A new NSS action is added to facilitate large distributed system
4227 administration. The action, MERGE, allows remote user stores like LDAP
4228 to be merged into local user stores like /etc/groups in order to provide
4229 easy to use, updated, and managed sets of merged credentials. The new
4230 action can be used by configuring it in /etc/nsswitch.conf:
4231 group: files [SUCCESS=merge] nis
4232 Implemented by Stephen Gallagher (Red Hat).
4234 * The deprecated __malloc_initialize_hook variable has been removed from the
4237 * The long unused localedef --old-style option has been removed. It hasn't
4238 done anything in over 16 years. Scripts using this option can safely
4241 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4242 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4243 return the next representable value in the direction of positive infinity
4244 and the nextdown functions return the next representable value in the
4245 direction of negative infinity. These are currently enabled as GNU
4248 Security related changes:
4250 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4251 could result in a stack overflow when getnetbyname was called with an
4252 overly long name. (CVE-2016-3075)
4254 * Previously, getaddrinfo copied large amounts of address data to the stack,
4255 even after the fix for CVE-2013-4458 has been applied, potentially
4256 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4257 instead. Reported by Michael Petlan. (CVE-2016-3706)
4259 * The glob function suffered from a stack-based buffer overflow when it was
4260 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4261 Reported by Alexander Cherepanov. (CVE-2016-1234)
4263 * The Sun RPC UDP client could exhaust all available stack space when
4264 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4265 alloca plugin for GCC. (CVE-2016-4429)
4267 * The IPv6 name server management code in libresolv could result in a memory
4268 leak for each thread which is created, performs a failing naming lookup,
4269 and exits. Over time, this could result in a denial of service due to
4270 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4272 The following bugs are resolved with this release:
4274 [1170] localedata: ne_NP: update Nepali locale definition file
4275 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4277 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4278 [6796] math: fdim() does not set errno on overflow
4279 [10354] libc: posix_spawn should use vfork() in more cases than presently
4280 [11213] localedata: localedata: add copyright disclaimer to locale files
4281 [12143] localedata: chr_US: new Cherokee locale
4282 [12450] localedata: sgs_LT: new locale
4283 [12676] localedata: ln_CD: new locale
4284 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4286 [13304] math: fma, fmaf, fmal produce wrong results
4287 [14259] build: --localedir arg to configure is ignored
4288 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4289 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4290 [14934] localedata: es_CL: wrong first weekday chilean locale
4291 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4293 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4295 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4296 [15368] nptl: raise() is not async-signal-safe
4297 [15479] math: ceil, floor, round and trunc raise inexact exception
4298 [15578] localedata: kk_KZ: various updates
4299 [16003] localedata: pap_AN: punt old locale
4300 [16137] localedata: iw_IL: punt old locale
4301 [16190] localedata: eo: new esperanto locale
4302 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4303 [16742] malloc: race condition: pthread_atfork() called before first
4304 malloc() results in unexpected locking behaviour/deadlocks
4305 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4307 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4308 [17565] localedata: pt_PT: wrong (work-)week start
4309 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4310 [17950] build: Build fails with -msse
4311 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4312 [18433] libc: posix_spawn does not return correctly upon failure to
4314 [18453] localedata: charmaps/IBM875: incorrect codes
4315 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4317 [18896] localedata: he_IL: improvements for currency
4318 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4319 Romanian locale data
4320 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4322 [19056] libc: Deprecate readdir_r
4323 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4325 [19198] localedata: nl_NL: small improvements for Dutch locales
4326 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4327 nameservers (CVE-2016-5417)
4328 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4330 [19400] locale: Language missing in "iso-639.def", trivial fix in
4332 [19431] malloc: Deadlock between fflush, getdelim, and fork
4333 [19505] libc: Incorrect file descriptor validity checks in
4334 posix_spawn_file_actions_add{open,close,dup2}
4335 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4336 when using RTLD_NEXT
4337 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4338 `intl/{gettextP,loadinfo}.h'
4339 [19534] libc: execle, execlp may use malloc
4340 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4341 [19573] network: res_nclose and __res_maybe_init disagree about name
4342 server initialization, breaking Hesiod
4343 [19575] localedata: Status of GB18030 tables
4344 [19581] localedata: sr_* date_fmt string contains additional newline
4345 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4347 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4348 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4349 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4350 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4352 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4354 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4356 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4357 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4358 [19633] locale: strfmon_l applies global locale to number formatting
4359 [19642] network: Memory leak in getnameinfo
4360 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4361 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4363 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4364 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4366 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4367 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4369 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4371 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4373 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4374 pointers and lengths in error-case.
4375 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4376 report errors on UTF-16 surrogates values.
4377 [19755] nscd: nscd assertion failure in gc
4378 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4379 [19759] libc: mempcpy shouldn't be inlined
4380 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4381 [19765] libc: s390 needs an optimized mempcpy
4382 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4383 NAME_MAX limit assumption (CVE-2016-1234)
4384 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4385 [19787] network: Missing and incorrect truncation checks in getnameinfo
4386 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4388 [19791] network: Assertion failure in res_query.c with un-connectable name
4390 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4391 [19822] math: libm.so install clobbers old version
4392 [19825] network: resolv: send_vc can return uninitialized data in second
4393 response to getaddrinfo
4394 [19830] network: nss_dns: should check RDATA length against buffer length
4395 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4396 confronted with A/AAAA records of invalid size
4397 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4398 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4399 [19853] stdio: Printing IBM long double in decimal with high precision is
4401 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4402 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4403 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4405 [19865] network: Assertion failure or memory leak in
4406 _nss_dns_getcanonname_r
4407 [19868] network: nss_dns: netent code does not skip over non-PTR records
4408 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4410 [19881] string: Improve x86-64 memset
4411 [19907] string: Incorrect memcpy tests
4412 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4414 [19925] libc: termios.h XCASE namespace
4415 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4416 [19929] libc: limits.h NL_NMAX namespace
4417 [19931] stdio: Memory leak in vfprintf
4418 [19957] libc: clone(CLONE_VM) access invalid parent memory
4419 [19963] localedata: en_IL: New locale
4420 [19989] stdio: stdio.h cuserid namespace
4421 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4423 [19996] locale: langinfo.h nl_langinfo_l namespace
4424 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4425 [20010] network: getaddrinfo: Stack overflow in hostent translation
4427 [20012] stdio: libio: fmemopen append mode failure
4428 [20014] stdio: stdio.h namespace for pre-threads POSIX
4429 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4430 [20023] libc: fcntl.h timespec namespace
4431 [20024] math: [x86_64] vectorized sincos trashes the stack
4432 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4433 [20041] time: sys/time.h timespec namespace
4434 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4435 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4436 [20051] libc: ttyslot in wrong header under wrong conditions
4437 [20054] libc: gethostname not declared for XPG4
4438 [20055] libc: termios.h missing tcgetsid for XPG4
4439 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4441 [20073] libc: sys/stat.h fchmod namespace
4442 [20074] libc: stdlib.h rand_r namespace
4443 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4444 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4446 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4447 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4449 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4450 [20119] libc: Wrong mask for processors level type from CPUID
4451 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4452 AS not supporting AVX512
4453 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4455 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4456 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4458 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4459 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4460 [20178] libc: posix_spawn{p} should not call exit
4461 [20191] stdio: libio: vtables hardening
4462 [20195] string: FMA4 detection requires CPUID execution with register
4464 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4465 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4467 [20212] math: acos (sNaN) returns sNaN
4468 [20213] math: asin (sNaN) returns sNaN
4469 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4470 [20218] math: [i386] asinhl (sNaN) returns sNaN
4471 [20219] math: [i386] atanhl (sNaN) returns sNaN
4472 [20222] stdio: fopencookie: Mangle function pointers
4473 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4474 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4475 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4477 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4478 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4479 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4480 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4481 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4482 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4483 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4484 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4485 [20240] math: modf (sNaN) returns sNaN
4486 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4487 [20250] math: frexp (sNaN) returns sNaN
4488 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4489 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4491 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4492 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4493 subscript is below array bounds [-Werror=array-bounds]
4494 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4495 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4497 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4498 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4500 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4501 "invalid" exceptions
4502 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4503 [20316] localedata: id_ID: Februari instead of Pebruari
4504 [20327] string: POWER8 strcasecmp returns incorrect result
4505 [20347] math: Failure: Test: j0_downward (0xap+0)
4506 [20348] libc: FAIL: misc/tst-preadvwritev64
4507 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4508 [20350] libc: There is no test for p{read,write}64
4509 [20357] math: Incorrect cos result for 1.5174239687223976
4510 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4514 * Unicode 8.0.0 Support: Character encoding, character type info, and
4515 transliteration tables are all updated to Unicode 8.0.0, using new
4516 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4517 These updates cause user visible changes, such as the fixes for bugs
4518 89, 16061, and 18568.
4520 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4521 kernel-internal CPU set size. This means that requests that change the
4522 CPU affinity which failed before (for example, an all-ones CPU mask) will
4523 now succeed. Applications that need to determine the effective CPU
4524 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4525 setting it because the kernel can adjust it (and the previous size check
4526 would not detect this in the majority of cases).
4528 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4529 the following new symbols are used: fts64_children, fts64_close,
4530 fts64_open, fts64_read and fts64_set.
4532 * getaddrinfo now detects certain invalid responses on an internal netlink
4533 socket. If such responses are received, an affected process will
4534 terminate with an error message of "Unexpected error <number> on netlink
4535 descriptor <number>" or "Unexpected netlink response of size <number> on
4536 descriptor <number>". The most likely cause for these errors is a
4537 multi-threaded application which erroneously closes and reuses the netlink
4538 file descriptor while it is used by getaddrinfo.
4540 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4541 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4542 unnecessary serialization of memory allocation requests across threads.
4543 The defect is now corrected. Users should see a substantial increase in
4544 the concurrent throughput of allocation requests for applications which
4545 trigger this bug. Affected applications typically create and
4546 destroy threads frequently. (Bug 19048 was reported and analyzed by
4549 * There is now a --disable-timezone-tools configure option for disabling the
4550 building and installing of the timezone related utilities (zic, zdump, and
4551 tzselect). This is useful for people who build the timezone data and code
4552 independent of the GNU C Library.
4554 * The obsolete header <regexp.h> has been removed. Programs that require
4555 this header must be updated to use <regex.h> instead.
4557 * The obsolete functions bdflush, create_module, get_kernel_syms,
4558 query_module and uselib are no longer available to newly linked binaries;
4559 the header <sys/kdaemon.h> has been removed. These functions and header
4560 were specific to systems using the Linux kernel and could not usefully be
4561 used with the GNU C Library on systems with version 2.6 or later of the
4564 * Optimized string, wcsmbs and memory functions for IBM z13.
4565 Implemented by Stefan Liebler.
4567 * Newly linked programs that define a variable called signgam will no longer
4568 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4569 require signgam to be set by those functions must ensure that they use the
4570 variable provided by the GNU C Library and declared in <math.h>, without
4571 defining their own copy.
4573 * The minimum GCC version that can be used to build this version of the GNU
4574 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4575 still be used to compile programs using the GNU C Library.
4577 Security related changes:
4579 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4580 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4582 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4583 the pointer guard feature. It is always enabled. Previously,
4584 LD_POINTER_GUARD could be used to disable security hardening in binaries
4585 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4588 * An integer overflow in hcreate and hcreate_r could lead to an
4589 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4591 * The catopen function no longer has unbounded stack usage. Reported by
4592 Max. (CVE-2015-8779)
4594 * The nan, nanf and nanl functions no longer have unbounded stack usage
4595 depending on the length of the string passed as an argument to the
4596 functions. Reported by Joseph Myers. (CVE-2014-9761)
4598 * A stack-based buffer overflow was found in libresolv when invoked from
4599 libnss_dns, allowing specially crafted DNS responses to seize control
4600 of execution flow in the DNS client. The buffer overflow occurs in
4601 the functions send_dg (send datagram) and send_vc (send TCP) for the
4602 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4603 family. The use of AF_UNSPEC triggers the low-level resolver code to
4604 send out two parallel queries for A and AAAA. A mismanagement of the
4605 buffers used for those queries could result in the response of a query
4606 writing beyond the alloca allocated buffer created by
4607 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4608 the overflow. Thanks to the Google Security Team and Red Hat for
4609 reporting the security impact of this issue, and Robert Holiday of
4610 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4612 The following bugs are resolved with this release:
4614 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4615 [887] math: Math library function "logb" and "nextafter" inconsistent
4616 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4617 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4618 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4619 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4621 [4404] localedata: German translation of "Alarm clock" is misleading
4622 [6799] math: nextafter() and nexttoward() doesn't set errno on
4623 overflow/underflow errors
4624 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4626 [10432] nis: _nss_nis_setnetgrent assertion failure
4627 [11460] libc: fts has no LFS support
4628 [12926] network: getaddrinfo()/make_request() may spin forever
4629 [13065] nptl: Race condition in pthread barriers
4630 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4631 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4633 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4634 [14912] libc: Rename non-installed bits/*.h headers
4635 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4636 [15367] math: Let gcc use __builtin_isinf
4637 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4638 [15421] math: lgamma wrongly sets signgam for ISO C
4639 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4640 FE_INVALID with argument out of range
4641 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4643 [15786] dynamic-link: ifunc resolver functions can smash function
4645 [15918] math: Unnecessary check for equality in hypotf()
4646 [16061] localedata: Review / update transliteration data
4647 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4649 [16141] time: strptime %z offset restriction
4650 [16171] math: drem should be alias of remainder
4651 [16296] math: fegetround is pure?
4652 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4653 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4655 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4656 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4658 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4659 "Exception "Inexact" set" on ppc32
4660 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4661 [16517] math: Missing underflow exception from tanf/tan/tanl
4662 [16519] math: Missing underflow exception from sinhf
4663 [16520] math: Missing underflow exception from tanhf
4664 [16521] math: Missing underflow exception from exp2
4665 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4667 [16734] stdio: fopen calls mmap to allocate its buffer
4668 [16961] math: nan function incorrect handling of bad sequences
4669 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4670 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4671 [16985] locale: localedef: confusing error message when opening output
4673 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4674 [17197] locale: Redundant shift character in iconv conversion output at
4676 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4677 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4678 [17250] dynamic-link: static linking breaks nss loading
4679 (getaddrinfo/getpwnam/etc...)
4680 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4682 [17441] math: isnan() should use __builtin_isnan() in GCC
4683 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4684 (related to lock elision)
4685 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4686 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4687 [17887] time: strptime should be able to parse "+01:00" style timezones
4688 [17905] libc: catopen() Multiple unbounded stack allocations
4690 [18084] libc: backtrace (..., 0) dumps core on x86
4691 [18086] libc: nice() sets errno to 0 on success
4692 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4693 is too large (CVE-2015-8778)
4694 [18251] dynamic-link: SONAME missing when audit modules provides path
4695 [18265] libc: add attributes for wchar string and memory functions
4696 [18370] math: csqrt missing underflows
4697 [18421] libc: [hppa] read-only segment has dynamic relocations
4698 [18472] libc: Obsolete syscall wrappers should be compat symbols
4699 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4700 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4701 [18525] localedata: Remove locale timezone information
4702 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4703 [18568] localedata: Update locale data to Unicode 8.0
4704 [18589] locale: sort-test.sh fails at random
4705 [18595] math: ctan, ctanh missing underflows
4706 [18604] libc: assert macro-expands its argument
4707 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4708 contains a vector instruction exception.
4709 [18611] math: j1, jn missing errno setting on underflow
4710 [18618] localedata: sync Chechen locale definitions with other *_RU
4712 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4713 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4714 [18665] network: In send_dg, the recvfrom function is NOT always using the
4715 buffer size of a newly created buffer (CVE-2015-7547)
4716 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4718 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4720 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4721 [18699] math: tilegx cproj() for various complex infinities does not yield
4723 [18724] libc: Harden put*ent functions against data injection
4724 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4725 [18755] build: build errors with -DNDEBUG
4726 [18757] stdio: fmemopen fails to set errno on failure
4727 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4729 [18781] libc: openat64 lacks O_LARGEFILE
4730 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4731 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4732 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4733 [18790] math: [ldbl-128ibm] tanhl inaccurate
4734 [18795] libc: stpncpy fortification misses buffer lengths that are
4735 statically too large
4736 [18796] build: build fails for --disable-mathvec
4737 [18803] math: hypot missing underflows
4738 [18820] stdio: fmemopen may leak memory on failure
4739 [18823] math: csqrt spurious underflows
4740 [18824] math: fma spurious underflows
4741 [18825] math: pow missing underflows
4742 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4743 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4744 [18870] build: sem_open.c fails to compile with missing symbol
4746 [18872] stdio: Fix memory leak in printf_positional
4747 [18873] libc: posix_fallocate overflow check ineffective
4748 [18875] math: Excess precision leads incorrect libm
4749 [18877] libc: arm: mmap offset regression
4750 [18887] libc: memory corruption when using getmntent on blank lines
4751 [18918] localedata: hu_HU: change time to HH:MM:SS format
4752 [18921] libc: Regression: extraneous stat() and fstat() performed by
4754 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4755 binaries (CVE-2015-8777)
4756 [18951] math: tgamma missing underflows
4757 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4759 [18953] localedata: lt_LT: change currency symbol to the euro
4760 [18956] math: powf inaccuracy
4761 [18961] math: [i386] exp missing underflows
4762 [18966] math: [i386] exp10 missing underflows
4763 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4764 [18969] build: multiple string test failures due to missing locale
4766 [18970] libc: Reference of pthread_setcancelstate in libc.a
4767 [18977] math: float / long double Bessel functions not in XSI POSIX
4768 [18980] math: i386 libm functions return with excess range and precision
4769 [18981] math: i386 scalb*, ldexp return with excess range and precision
4770 [18982] stdio: va_list and vprintf
4771 [18985] time: Passing out of range data to strftime() causes a segfault
4773 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4774 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4775 [19012] locale: iconv_open leaks memory on error path
4776 [19016] math: clog, clog10 inaccuracy
4777 [19018] nptl: Mangle function pointers in tls_dtor_list
4778 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4779 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4780 [19048] malloc: malloc: arena free list can become cyclic, increasing
4782 [19049] math: [powerpc] erfc incorrect zero sign
4783 [19050] math: [powerpc] log* incorrect zero sign
4784 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4785 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4786 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4787 [19074] network: Data race in _res_hconf_reorder_addrs
4788 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4789 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4790 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4792 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4794 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4795 [19086] manual: posix_fallocate64 documented argument order is wrong.
4796 [19088] math: lround, llround missing exceptions close to overflow
4798 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4799 [19095] math: dbl-64 lrint incorrect for 64-bit long
4800 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4801 [19124] dynamic-link: ld.so failed to build with older assembler
4802 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4803 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4804 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4805 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4806 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4807 pthread_setaffinity_np
4808 [19156] math: [ldbl-128] j0l spurious underflows
4809 [19164] nptl: tst-getcpu fails with many possible CPUs
4810 [19168] math: math/test-ildoubl and math/test-ldouble failure
4811 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4812 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4814 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4815 (FE_NOMASK_ENV) do not clear SSE exceptions
4816 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4817 _int_new_arena/reused_arena
4818 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4819 [19201] math: dbl-64 remainder incorrect sign of zero result
4820 [19205] math: bits/math-finite.h conditions do not match math.h and
4822 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4823 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4824 for C99-based standards
4825 [19212] libc: features.h not -Wundef clean
4826 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4828 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4829 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4830 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4832 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4833 "inexact" exceptions
4834 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4836 [19242] libc: strtol incorrect in Turkish locales
4837 [19243] malloc: reused_arena can pick an arena on the free list, leading
4838 to an assertion failure and reference count corruption
4839 [19253] time: tzset() ineffective when temporary TZ did not include DST
4841 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4842 [19270] math: [hppa] Shared libm missing __isnanl
4843 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4844 MAP_HUGETLB and MAP_STACK defines
4845 [19313] nptl: Wrong __cpu_mask for x32
4846 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4847 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4848 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4849 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4850 [19363] time: x32: times() return value wrongly truncates/sign extends
4852 [19367] dynamic-link: Improve branch prediction on Silvermont
4853 [19369] network: Default domain name not reset by res_ninit when "search"
4854 / "domain" entry is removed from resolv.conf
4855 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4857 [19385] localedata: bg_BG: time separator should be colon, not comma
4858 [19408] libc: linux personality syscall wrapper may erroneously return an
4859 error on 32-bit architectures
4860 [19415] libc: dladdr returns wrong names on hppa
4861 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4862 IBM905, IBM907, and IBM909
4863 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4864 [19443] build: build failures with -DDEBUG
4865 [19451] build: Make check fails on test-double-vlen2
4866 [19462] libc: Glibc failed to build with -Os
4867 [19465] math: Wrong code with -Os
4868 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4870 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4872 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4873 [19486] math: S390: Math tests fail with "Exception Inexact set".
4874 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4875 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4877 [19590] math: Fail to build shared objects that use libmvec.so functions.
4881 * The following bugs are resolved with this release:
4883 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4884 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4885 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4886 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4887 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4888 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4889 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4890 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4891 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4892 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4893 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4894 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4895 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4896 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4897 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4898 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4899 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4900 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4901 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4902 18657, 18676, 18694, 18696, 18887.
4904 * Cache information can be queried via sysconf() function on s390 e.g. with
4905 _SC_LEVEL1_ICACHE_SIZE as argument.
4907 * A buffer overflow in gethostbyname_r and related functions performing DNS
4908 requests has been fixed. If the NSS functions were called with a
4909 misaligned buffer, the buffer length change due to pointer alignment was
4910 not taken into account. This could result in application crashes or,
4911 potentially arbitrary code execution, using crafted, but syntactically
4912 valid DNS responses. (CVE-2015-1781)
4914 * The time zone file parser has been made more robust against crafted time
4915 zone files, avoiding heap buffer overflows related to the processing of
4916 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4917 large time zone data files. Overly long time zone specifiers in the TZ
4918 variable no longer result in stack overflows and crashes.
4920 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4921 for LD and GD on x86 and x86-64, has been implemented. You will need
4922 binutils-2.24 or later to enable this optimization.
4924 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4925 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4926 Hat). These updates cause user visible changes, such as the fix for bug
4929 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4930 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4931 condition in some applications.
4933 * Added vector math library named libmvec with the following vectorized x86_64
4934 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4936 The library can be disabled with --disable-mathvec. Use of the functions is
4937 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4938 Shared library libmvec.so is linked in as needed when using -lm (no need to
4939 specify -lmvec explicitly for not static builds).
4940 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4942 * A new fmemopen implementation has been added with the goal of POSIX
4943 compliance. The new implementation fixes the following long-standing
4944 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4945 old implementation is still present for use be by existing binaries.
4947 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4948 releases. It has been fixed to match 2.19 and older, but binaries built
4949 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4951 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4952 Contributed by Roland McGrath (Google).
4954 * The header <regexp.h> is deprecated, and will be removed in a future
4955 release. Use of this header will trigger a deprecation warning.
4956 Application developers should update their code to use <regex.h> instead.
4958 This header was formerly part of SUS, but was deprecated in 1994 and
4959 removed from the standard in 2001. Also, the glibc implementation
4960 leaks memory. See BZ#18681 for more details.
4964 * The following bugs are resolved with this release:
4966 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4967 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4968 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4969 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4970 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4971 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4972 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4973 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4974 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4975 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4978 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4979 too little memory for the to-be-scanned arguments and overflow the
4980 allocated buffer. The implementation now correctly computes the required
4981 buffer size when using malloc, and switches to malloc from alloca as
4984 * A new semaphore algorithm has been implemented in generic C code for all
4985 machines. Previous custom assembly implementations of semaphore were
4986 difficult to reason about or ensure that they were safe. The new version
4987 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4988 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4989 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4991 * Port to Altera Nios II has been contributed by Mentor Graphics.
4993 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4994 implementations for powerpc64/powerpc64le.
4995 Implemented by Adhemerval Zanella (IBM).
4997 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4998 and powerpc64le. This may improve lock scaling of existing programs on
4999 HTM capable systems. The lock elision code is only enabled with
5000 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
5001 powerpc will issue a transaction abort on every syscall to avoid side
5002 effects being visible outside transactions.
5004 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
5005 AArch64. Contributed by ARM Ltd.
5007 * i386 memcpy functions optimized with SSE2 unaligned load/store.
5009 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
5010 under certain input conditions resulting in the execution of a shell for
5011 command substitution when the application did not request it. The
5012 implementation now checks WRDE_NOCMD immediately before executing the
5013 shell and returns the error WRDE_CMDSUB as expected.
5015 * CVE-2012-3406 printf-style functions could run into a stack overflow when
5016 processing format strings with a large number of format specifiers.
5018 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
5019 infinite loop if the DNS response contained a PTR record of an unexpected
5022 * The minimum GCC version that can be used to build this version of the GNU
5023 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
5024 still be used to compile programs using the GNU C Library.
5026 * The GNU C Library is now built with -Werror by default. This can be
5027 disabled by configuring with --disable-werror.
5029 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
5031 * The obsolete sigvec function has been removed. This was the original
5032 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
5033 programs have been using instead for about 25 years. Of course, ABI
5034 compatibility for old binaries using sigvec remains intact.
5036 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5037 with newer versions of bison.
5039 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5040 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5041 registers overlay two consecutive single-precision registers. MIPS32R2
5042 introduced a new FPU mode (FR=1) where double-precision registers extend the
5043 corresponding single-precision registers which is incompatible with the
5044 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5045 require the use of FR=1 making a transition necessary. New o32 ABI
5046 extensions enable users to migrate over time from the original o32 ABI
5047 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5048 tracks the ABI of any loaded object and verifies that new objects are
5049 compatible. Mode transitions will also be requested as required and
5050 unsupportable objects will be rejected. The ABI checks include both soft and
5051 hard float ABIs for o32, n32 and n64.
5053 GCC 5 with GNU binutils 2.25 onwards:
5054 It is strongly recommended that all o32 system libraries are built using the
5055 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5056 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5057 compiler using --with-fp-32=xx to set this by default.
5061 * The following bugs are resolved with this release:
5063 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5064 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5065 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5066 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5067 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5068 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5069 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5070 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5071 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5072 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5073 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5074 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5075 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5076 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5077 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5079 * Reverted change of ABI data structures for s390 and s390x:
5080 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5081 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5082 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5083 are preserved pointing straight to the same implementation as the old ones.
5084 Given that, new callers will simply provide a too-big buffer to these
5085 functions. Any applications/libraries out there that embed jmp_buf or
5086 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5087 against 2.19 headers will have to rebuilt again. This is necessary in any
5088 case to revert the breakage in their ABI caused by the glibc change.
5090 * Support for file description locks is added to systems running the
5091 Linux kernel. The standard file locking interfaces are extended to
5092 operate on file descriptions, not file descriptors, via the use of
5093 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5094 are associated with an open file instead of a process.
5096 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5098 * The minimum Linux kernel version that this version of the GNU C Library
5099 can be used with is 2.6.32.
5101 * Running the testsuite no longer terminates as soon as a test fails.
5102 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5103 with PASS or FAIL lines for individual tests. A summary of the results is
5104 printed, including a list of failing lists, and "make check" exits with
5105 error status if there were any unexpected failures. "make check
5106 stop-on-test-failure=y" may be used to keep the old behavior.
5108 * The am33 port, which had not worked for several years, has been removed
5111 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5112 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5113 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5114 conflicted with POSIX (support for which was removed in 2.19), the
5115 interfaces those macros enabled remain available when compiling with
5116 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5117 test macros defined.
5119 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5121 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5122 This may improve lock scaling of existing programs on TX capable systems.
5123 The lock elision code is only built with --enable-lock-elision=yes and
5124 then requires a GCC version supporting the TX builtins. With lock elision
5125 default mutexes are elided via __builtin_tbegin, if the cpu supports
5126 transactions. By default lock elision is not enabled and the elision code
5129 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5130 copy the path argument. This allowed programs to cause posix_spawn to
5131 deference a dangling pointer, or use an unexpected pathname argument if
5132 the string was modified after the posix_spawn_file_actions_addopen
5135 * All supported architectures now use the main glibc sysdeps directory
5136 instead of some being in a separate "ports" directory (which was
5137 distributed separately before glibc 2.17).
5139 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5140 On configurations that support it (all Linux configurations), it's now
5141 used regardless of the --enable-add-ons switch to configure. It is no
5142 longer possible to build such configurations without pthreads support.
5144 * Locale names, including those obtained from environment variables (LANG
5145 and the LC_* variables), are more tightly checked for proper syntax.
5146 setlocale will now fail (with EINVAL) for locale names that are overly
5147 long, contain slashes without starting with a slash, or contain ".." path
5148 components. (CVE-2014-0475) Previously, some valid locale names were
5149 silently replaced with the "C" locale when running in AT_SECURE mode
5150 (e.g., in a SUID program). This is no longer necessary because of the
5153 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5154 with application code using Intel MPX instructions. (With all previous
5155 versions, the MPX register state could be clobbered when making calls
5156 into or out of a shared library.) Note that while the new dynamic
5157 linker is compatible with all known x86 hardware whether or not it
5158 supports Intel MPX, some x86 instruction-set emulators might fail to
5159 handle the new instruction encodings. This is known to affect Valgrind
5160 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5161 release), and might affect other tools that do instruction emulation.
5163 * Support for loadable gconv transliteration modules has been removed.
5164 The support for transliteration modules has been non-functional for
5165 over a decade, and the removal is prompted by security defects. The
5166 normal gconv conversion modules are still supported. Transliteration
5167 with //TRANSLIT is still possible, and the //IGNORE specifier
5168 continues to be supported. (CVE-2014-5119)
5170 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5171 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5172 resulting a denial-of-service security vulnerability in applications which
5173 use functions related to iconv. (CVE-2014-6040)
5177 * The following bugs are resolved with this release:
5179 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5180 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5181 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5182 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5183 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5184 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5185 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5186 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5187 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5188 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5189 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5190 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5191 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5192 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5193 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5194 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5195 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5196 16431, 16453, 16474, 16506, 16510, 16529
5198 * Slovenian translations for glibc messages have been contributed by the
5199 Translation Project's Slovenian team of translators.
5201 * The public headers no longer use __unused nor __block. This change is to
5202 support compiling programs that are derived from BSD sources and use
5203 __unused internally, and to support compiling with Clang's -fblock
5204 extension which uses __block.
5206 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5207 large collation sequences to optimize multiple passes. This cache
5208 computation may overflow for large collation sequences and may cause a
5209 stack or buffer overflow. This is now fixed to use a slower algorithm
5210 which does not use a cache if there is an integer overflow.
5212 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5213 rules for large collation sequences to optimize multiple passes and falls
5214 back to alloca if malloc fails, resulting in a possible stack overflow.
5215 The implementation now falls back to an uncached collation sequence lookup
5218 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5219 initialized for static applications resulting in the security feature
5220 being disabled. The pointer guard is now correctly initialized to a
5221 random value for static applications. Existing static applications need
5222 to be recompiled to take advantage of the fix (bug 15754).
5224 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5225 to the d_name member of struct dirent, or omit the terminating NUL
5226 character. (Bugzilla #14699).
5228 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5229 aligned_alloc functions could allocate too few bytes or corrupt the
5230 heap when passed very large allocation size values (Bugzilla #15855,
5233 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5234 for AF_INET6 has been fixed (Bugzilla #16072).
5236 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5237 pap_CW, quz_PE, the_NP.
5239 * Substantially revised locales: gd_GB, ht_HT
5241 * The LC_ADDRESS field was updated to support country_car for almost all
5244 * ISO 1427 definitions were updated.
5246 * ISO 3166 definitions were updated.
5248 * The localedef utility now supports --big-endian and --little-endian
5249 command-line options to generate locales for a different system from that
5250 for which the C library was built.
5252 * Binary locale files now only depend on the endianness of the system for
5253 which they are generated and not on other properties of that system. As a
5254 consequence, binary files generated with new localedef may be incompatible
5255 with old versions of the GNU C Library, and binary files generated with
5256 old localedef may be incompatible with this version of the GNU C Library,
5257 in the following circumstances:
5259 + Locale files may be incompatible on m68k systems.
5261 + Locale archive files (but not separate files for individual locales) may
5262 be incompatible on systems where plain "char" is signed.
5264 * The configure option --disable-versioning has been removed. Builds with
5265 --disable-versioning had not worked for several years.
5267 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5268 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5270 * SystemTap probes for malloc have been introduced.
5272 * SystemTap probes for slow multiple precision fallback paths of
5273 transcendental functions have been introduced.
5275 * Support for powerpc64le has been added.
5277 * The soft-float powerpc port now supports e500 processors.
5279 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5281 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5282 set of header declarations that are enabled by default, even when other
5283 feature test macros or compiler options such as -std=c99 would otherwise
5284 disable some of those declarations.
5286 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5287 conflict with POSIX. The libbsd-compat library (which was a dummy library
5288 that did nothing) has also been removed.
5290 * Preliminary documentation about Multi-Thread, Async-Signal and
5291 Async-Cancel Safety has been added.
5293 * Change of ABI data structures for s390 and s390x:
5294 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5295 allow for future hardware extensions. All library functions that accept or
5296 return these structures were versioned in order to provide backwards
5297 compatibility with existing code. However, not all cases can be handled
5298 with interface versioning. If an application embeds either structure into
5299 another structure and that structure is passed to another compilation unit
5300 which expects the newer larger-sized object then any access to the new
5301 fields will result in undefined behaviour. Similarly any access to fields
5302 that were moved by the enlarging of the structures will cause undefined
5303 behaviour. To fix the undefined behaviour all objects that are part of the
5304 final in-memory image must agree on the size of structures, and this may
5305 require recompilation.
5309 * The following bugs are resolved with this release:
5311 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5312 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5313 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5314 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5315 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5316 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5317 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5318 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5319 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5320 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5321 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5322 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5323 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5326 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5327 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5328 Distributions can re-enable building and using pt_chown via the new configure
5329 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5330 considerable security risks and should only be used if the distribution
5331 understands and accepts the risks.
5333 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5336 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5337 fixed (Bugzilla #15330).
5339 * Add support for calling C++11 thread_local object destructors on thread
5340 and program exit. This needs compiler support for offloading C++11
5341 destructor calls to glibc.
5343 * Improved worst case performance of libm functions with double inputs and
5346 * Support for priority inherited mutexes in pthread condition variables on
5347 non-x86 architectures.
5349 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5351 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5353 * Optimized string functions for ARM. Implemented by Will Newton and
5356 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5358 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5361 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5362 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5364 * Added a benchmark framework to track performance of functions in glibc.
5366 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5367 It is based on draft TS 18661 and currently enabled as a GNU extension.
5369 * On Linux, the clock function now uses the clock_gettime system call
5370 for improved precision, rather than old times system call.
5372 * Added support for version-3 tz format files. This is needed when using
5373 the tz database release 2013e or later, and affects a few unusual cases --
5374 currently only TZ='America/Godthab' for time stamps after 2037.
5376 * Added new API functions pthread_getattr_default_np and
5377 pthread_setattr_default_np to get and set the default pthread
5378 attributes of a process.
5380 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5381 This may improve lock scaling of existing programs on TSX capable systems.
5382 When the --enable-lock-elision=yes parameter is specified at configure
5383 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5386 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5387 availability). Implemented by Ryan S. Arnold.
5389 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5393 * The following bugs are resolved with this release:
5395 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5396 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5397 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5398 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5399 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5400 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5401 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5402 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5403 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5404 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5405 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5406 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5407 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5408 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5409 14879, 14889, 14893, 14898, 14914.
5411 * Optimization of memcpy for MIPS.
5413 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5414 EMFILE has been fixed (Bugzilla #14889).
5416 * The add-on ports collection is now distributed in the "ports" subdirectory
5417 of the main GNU C Library distribution, rather than separately.
5419 * Port to ARM AArch64 contributed by Linaro.
5421 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5422 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5424 Implemented by Andreas Krebbel.
5426 * The new function secure_getenv allows secure access to the environment,
5427 returning NULL if running in a SUID/SGID process. This function replaces
5428 the internal function __secure_getenv.
5430 * SystemTap static probes have been added into the dynamic linker.
5431 Implemented by Gary Benson.
5433 * Optimizations of string functions strstr, strcasestr and memmem.
5434 Implemented by Maxim Kuvyrkov.
5436 * The minimum Linux kernel version that this version of the GNU C Library
5437 can be used with is 2.6.16.
5439 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5440 powerpc POWER7. Implemented by Will Schmidt.
5442 * New configure option --disable-nscd builds the C library such that it
5443 never attempts to contact the Name Service Caching Daemon (nscd).
5444 New configure option --disable-build-nscd avoids building nscd itself;
5445 this is the default if --disable-nscd is used.
5447 * Improved support for cross-compilation, including cross-testing and
5448 bootstrap builds without a previously built glibc.
5450 * Several testsuite tests are now able to test multiple IFUNC variants of an
5451 interface, rather than just testing the one that would be chooen by
5454 * New configure options --with-bugurl and --with-pkgversion, for
5455 distributors to use to embed their bug-reporting and package version
5456 information in --help and --version output.
5458 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5459 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5460 allows creation of chroots without the procfs mounted on /proc.
5462 * The `crypt' function now fails if passed salt bytes that violate the
5463 specification for those values. On Linux, the `crypt' function will
5464 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5465 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5466 when the mode is enabled.
5468 * The `clock_*' suite of functions (declared in <time.h>) is now available
5469 directly in the main C library. Previously it was necessary to link with
5470 -lrt to use these functions. This change has the effect that a
5471 single-threaded program that uses a function such as `clock_gettime' (and
5472 is not linked with -lrt) will no longer implicitly load the pthreads
5473 library at runtime and so will not suffer the overheads associated with
5474 multi-thread support in other code such as the C++ runtime library.
5476 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5481 * The following bugs are resolved with this release:
5483 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5484 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5485 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5486 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5487 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5488 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5489 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5490 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5491 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5492 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5493 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5494 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5495 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5496 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5497 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5498 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5499 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5500 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5501 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5502 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5503 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5504 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5507 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5508 configuring glibc with:
5509 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5510 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5511 Implemented by H.J. Lu.
5515 + define static_assert
5517 + do not declare gets
5519 + declare at_quick_exit and quick_exit also for ISO C11
5521 + aligned_alloc. NB: The code is deliberately allows the size parameter
5522 to not be a multiple of the alignment. This is a moronic requirement
5523 in the standard but it is only a requirement on the caller, not the
5526 + timespec_get added
5528 + uchar.h support added
5530 + CMPLX, CMPLXF, CMPLXL added
5532 Implemented by Ulrich Drepper.
5534 * Support for the IA-64 has been moved to ports.
5536 * Remove support for anything but ELF binary format
5538 * Checking versions of poll, ppoll added.
5539 Implemented by Ulrich Drepper.
5541 * More generic and 64-bit performance optimizations to math functions.
5542 Implemented by Ulrich Drepper.
5544 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5545 headers and functions available at compile time as they were before
5546 version 2.14. This option will be removed at some time in the future
5547 after the TI-RPC library becomes fully sufficient for the needs of
5548 existing applications.
5550 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5551 Note that glibc is not expected to work with any Linux kernel version
5554 * New header <sys/auxv.h> and function getauxval allowing easy access to
5555 the AT_* key-value pairs passed from the Linux kernel. The header also
5556 defines the HWCAP_* bits associated with the AT_HWCAP key.
5558 * New locales: mag_IN
5560 * New configure option --enable-systemtap builds SystemTap static probes
5561 into libc for setjmp and longjmp and into libpthread for various operations.
5562 So far the setjmp/longjmp probes and some of the libpthread probes are
5563 provided only for i*86 and x86_64.
5564 Implemented by Roland McGrath and Rayson Ho.
5566 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5568 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5571 * More optimized functions for SPARC. Implemented by David S. Miller.
5573 * Improved support for cross-compilation, especially bootstrap builds
5574 without a previously built glibc.
5576 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5577 Chris Metcalf from Tilera.
5579 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5580 now supported for ARM processors.
5582 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5583 as the name of the dynamic linker, to distinguish it from the
5584 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5586 * Support for CRIS has been removed from ports.
5588 * A new class of installed header has been documented for low-level
5589 platform-specific functionality. PowerPC added the first instance with a
5590 function to provide time base register access. Contributed by Tulio
5591 Magno Quites Machado Filho.
5593 * ix86 configurations now install header files that are consistent with
5594 what x86-64 configurations install. These same header files can be used
5595 for -m32, -m64, or -mx32 builds.
5596 Contributed by H.J. Lu.
5598 * Math library bug fixes. A thorough audit of all open math library bugs was
5599 conducted by Joseph Myers. Significant progress was made on many math
5600 library bugs resulting in more accurate exceptions and function results.
5601 Many thanks to all those that contributed including Andreas Jaeger for his
5602 patch review and work on the x87 trigonometric instruction issues.
5604 * Timezone data is no longer installed. Timezone-related binaries and scripts
5605 will continue to be installed. Users should obtain their timezone data from
5606 their distribution provider or from the tzdata package at
5607 <ftp://munnari.oz.au/pub/>.
5611 * The following bugs are resolved with this release:
5613 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5614 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5615 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5616 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5617 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5618 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5619 13484, 13506, 13515, 13523, 13524, 13538, 13540
5621 * New program pldd to list loaded object of a process
5622 Implemented by Ulrich Drepper.
5624 * Add nss_db support back to glibc. No more dependency on Berkeley db
5625 and support for initgroups lookups.
5626 Implemented by Ulrich Drepper.
5628 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5629 Contributed by HJ Lu.
5631 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5632 Contributed by HJ Lu.
5634 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5635 on x86-32 and x86-64.
5636 Contributed by Liubov Dmitrieva.
5638 * Optimized strchr and strrchr for SSE on x86-32.
5639 Contributed by Liubov Dmitrieva.
5641 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5642 for x86-64 and x86-32.
5643 Contributed by Liubov Dmitrieva.
5645 * New interfaces: scandirat, scandirat64
5646 Implemented by Ulrich Drepper.
5648 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5649 Implemented by Ulrich Drepper.
5651 * nscd now also caches the netgroup database.
5652 Implemented by Ulrich Drepper.
5654 * Integrate libm with gcc's -ffinite-math-only option.
5655 Implemented by Ulrich Drepper.
5657 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5658 to math functions. Implemented by Ulrich Drepper.
5660 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5661 Implemented by Ulrich Drepper.
5663 * New Linux interfaces: process_vm_readv, process_vm_writev
5665 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5666 Implemented by Ulrich Drepper.
5668 * Optimized nearbyint and strcasecmp for PPC.
5669 Implemented by Adhemerval Zanella.
5671 * New locales: bho_IN, unm_US, es_CU, ta_LK
5675 * The following bugs are resolved with this release:
5677 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5678 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5679 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5680 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5681 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5682 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5683 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5684 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5685 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5686 12795, 12811, 12813, 12814, 12841
5688 * The RPC implementation in libc is obsoleted. Old programs keep working
5689 but new programs cannot be linked with the routines in libc anymore.
5690 Programs in need of RPC functionality must be linked against TI-RPC.
5691 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5693 Visible changes of this change include (obviously) the inability to link
5694 programs using RPC functions without referencing the TI-RPC library and the
5695 removal of the RPC headers from the glibc headers.
5696 Implemented by Ulrich Drepper.
5698 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5699 syncfs, setns, sendmmsg
5701 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5702 yue_HK, lij_IT, mhr_RU
5704 * New encodings: CP770, CP771, CP772, CP773, CP774
5706 * New program sotruss to trace calls through PLTs
5707 Implemented by Ulrich Drepper.
5709 * The malloc hook implementation is marked deprecated and will be removed
5710 from the default implementation in the next version. The design never
5711 worked ever since the introduction of threads. Even programs which do
5712 not create threads themselves can use multiple threads created internally.
5716 * The following bugs are resolved with this release:
5718 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5719 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5720 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5721 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5724 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5726 * POWER7 optimizations: memset, memcmp, strncmp
5728 * New optimized string functions for x86-64: strnlen (SSE2),
5729 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5730 Implemented by Ulrich Drepper.
5734 * The following bugs are resolved with this release:
5736 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5737 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5738 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5739 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5740 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5741 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5742 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5743 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5745 * New interfaces: pthread_getname_np, pthread_setname_np
5747 * New Linux interface: recvmmsg
5749 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5751 * The dynamic linker now recognizes supported ABI versions from the
5752 EI_ABIVERSION field in the ELF header.
5753 Implemented by Ulrich Drepper.
5755 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5756 will not be used to fill in password fields in the passwd.byname replies.
5757 Instead it is used to synthesize the shadow.byname table, should it be
5758 missing. This is a useful mode in some installations involving Solaris.
5759 Implemented by Ulrich Drepper.
5761 * New locales: kok_IN, sq_MK, cv_RU
5765 * The following bugs are resolved with this release:
5767 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5768 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5769 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5770 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5771 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5772 10789, 10817, 10823, 10840, 10847
5774 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5776 Implemented by Ulrich Drepper.
5778 * Checking version of longjmp added that fails if an uninitialized stack
5779 frame would be created. Implemented by Ulrich Drepper.
5781 * STT_GNU_IFUNC is now supported in static executables.
5782 Implemented by H.J. Lu.
5784 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5786 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5787 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5788 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5789 Contributed by H.J. Lu.
5791 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5792 Implemented by Ulrich Drepper.
5794 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5796 Contributed by H.J. Lu.
5798 * Support for fma instruction in AVX on x86-64.
5799 Implemented by H.J. Lu and Ulrich Drepper.
5801 * AVX support in x86-64 auditing support in ld.so.
5802 Implemented by H.J. Lu.
5804 * STB_GNU_UNIQUE support added.
5805 Implemented by Ulrich Drepper.
5807 * Implement second fallback mode for optimized DNS lookup for even more
5808 broken environments. If two requests from the same port are not
5809 handled correctly close the socket and open a new one before sending
5810 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5811 can be used to select this mode right away, instead of rediscovering the
5812 necessity is every process again.
5813 Implemented by Ulrich Drepper.
5815 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5816 Implemented by Adam Tkac.
5818 * Optimized iconv conversions for S390x.
5819 Implemented by Andreas Krebbel.
5821 * Using condvars with PI mutexes is now more efficient due to kernel
5822 support for requeueing to PI futexes. NPTL support added for x86-64.
5823 Implemented by Ulrich Drepper.
5825 * New locales: ps_AF, my_MM
5829 * The following bugs are resolved with this release:
5831 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5832 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5833 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5834 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5835 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5837 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5838 Implemented by Ulrich Drepper.
5840 * New Linux interfaces: accept4, fallocate, fallocate64.
5841 Implemented by Ulrich Drepper.
5843 * Correct declarations of string function when used in C++ code. This
5844 could lead to compile errors for invalid C++ code.
5846 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5849 * New POSIX 2008 interface: psiginfo
5850 Implemented by Ulrich Drepper.
5852 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5853 Implemented by Ulrich Drepper.
5855 * Support for selecting between multiple function definitions at runtime
5856 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5858 * The libcrypt library can now use the hash function implementations in
5859 NSS. Implemented by Ulrich Drepper.
5861 * The malloc implementation can be compiled to be less memory efficient
5862 but higher performing in multi-threaded programs.
5863 Implemented by Ulrich Drepper.
5865 * New locales: nan_TW@latin, ks_IN
5867 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5868 Implemented by Ulrich Drepper.
5870 * Extended printf hook support. It is possible to use user-defined types
5871 and extend existing format specifiers.
5872 Implemented by Ulrich Drepper.
5874 * Handling for group shadow files has been added.
5875 Implemented by Ulrich Drepper.
5877 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5878 servers (the case, e.g., for some people using the built-in DNS
5879 server in ADSL modems/routers). There is a once-per-process timeout
5880 in case of a broken server. To avoid it, users can run nscd or put
5881 'options single-request' in /etc/resolv.conf.
5882 Implemented by Ulrich Drepper.
5886 * The following bugs are resolved with this release:
5888 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5889 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5890 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5891 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5892 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5894 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5895 up at the same time. Implemented by Ulrich Drepper.
5897 * TLS descriptors for LD and GD on x86 and x86-64.
5898 Implemented by Alexandre Oliva.
5900 * getaddrinfo now handles DCCP and UDPlite.
5901 Implemented by Ulrich Drepper.
5903 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5904 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5905 Implemented by Ulrich Drepper.
5907 * New implementation of memmem, strstr, and strcasestr which is O(n).
5908 Implemented by Eric Blake.
5910 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5912 * Implement "e" option for popen to open file descriptor with the
5913 close-on-exec flag set. Implemented by Ulrich Drepper.
5915 * Implement "b" mode for fmemopen. In this mode writes writes don't
5916 implicitly add a NUL byte and seeks from the end of the buffer really
5917 use the buffer end, not the string length as the basis.
5918 Implemented by Ulrich Drepper.
5920 * Many functions, exported and internal, now atomically set the close-on-exec
5921 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5923 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5925 Implemented by Pravin Satpute.
5927 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5931 * The following bugs are resolved with this release:
5933 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5934 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5935 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5936 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5937 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5938 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5939 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5941 * New locales: bo_CN, bo_IN, shs_CA.
5943 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5945 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5946 Implemented by Pravin Satpute.
5948 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5950 * nscd caches now all timeouts for DNS entries
5951 Implemented by Ulrich Drepper.
5953 * nscd is more efficient and wakes up less often.
5954 Implemented by Ulrich Drepper.
5956 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5957 vdprintf, and obstack_vprintf.
5958 Implemented by Jakub Jelinek.
5960 * Faster memset for x86-64.
5961 Implemented by Harsha Jagasia and H.J. Lu.
5963 * Faster memcpy on x86.
5964 Implemented by Ulrich Drepper.
5966 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5967 Implemented by Ulrich Drepper.
5969 * Faster sqrt and sqrtf implementation for some PPC variants.
5970 Implemented by Steven Munroe.
5974 * The following bugs are resolved with this release:
5976 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5977 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5978 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5979 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5980 5071, 5103, 5104, 5112, 5113, 5184, 5186
5982 * More checking functions: fread, fread_unlocked, open*, mq_open.
5983 Implemented by Jakub Jelinek and Ulrich Drepper.
5985 * Extend fortification to C++. Implemented by Jakub Jelinek.
5987 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5988 by not recognizing 'a' as a modifier when those specs are requested.
5989 Implemented by Jakub Jelinek.
5991 * PPC optimizations to math and string functions.
5992 Implemented by Steven Munroe.
5994 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5995 options to be passed. Implemented by Ulrich Drepper.
5997 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5999 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
6000 Implemented by Ulrich Drepper.
6002 * Handle private futexes in the NPTL implementation.
6003 Implemented by Jakub Jelinek and Ulrich Drepper.
6005 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
6006 Implemented by Roland McGrath and Ulrich Drepper.
6008 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
6010 * SHA-256 and SHA-512 based password encryption.
6011 Implemented by Ulrich Drepper.
6013 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
6014 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
6017 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
6018 Implemented by Ulrich Drepper.
6022 * The following bugs are resolved with this release:
6024 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
6025 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
6026 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
6027 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
6028 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
6029 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
6030 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
6033 * New Linux interfaces: epoll_pwait, sched_getcpu.
6035 * New generic interfaces: strerror_l.
6037 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6041 * The following bugs are resolved with this release:
6043 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6044 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6045 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6046 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6047 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6048 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6049 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6050 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6051 3225, 3251, 3252, 3253, 3273
6053 * For Linux, the sorting of addresses returned by getaddrinfo now also
6054 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6055 Implemented by Ulrich Drepper.
6057 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6058 Implemented by Ulrich Drepper.
6060 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6062 * New iconv module for MIK. Contributed by Alexander Shopov.
6064 * For sites with broken group and/or passwd database, the auto-propagate
6065 option of nscd can prevent creating ID lookup entries from the results
6066 of a name lookup and vice versa. This usually is no problem but some
6067 site might have problems with the default behavior.
6068 Implemented by Ulrich Drepper.
6070 * Iterating over entire database in NIS can be slow. With the
6071 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6072 to trade time for memory. The entire database will be read at once.
6073 Implemented by Ulrich Drepper.
6075 * The interfaces introduced in RFC 3542 have been implemented by
6078 * Support for the new ELF hash table format was added by Ulrich Drepper.
6080 * Support for priority inheritance mutexes added by Jakub Jelinek and
6083 * Support for priority protected mutexes added by Jakub Jelinek.
6085 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6086 or_IN, csb_PL, fy_NL, sr_ME.
6090 * More overflow detection functions.
6092 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6093 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6095 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6096 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6097 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6098 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6099 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6100 by Masahide Washizawa.
6102 * It is now possible to install audit libraries for the dynamic linker using
6103 LD_AUDIT. Implemented by Ulrich Drepper.
6105 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6106 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6107 For a libc and libpthread that works well on Linux 2.4 kernels, we
6108 recommend using the stable 2.3 branch.
6110 * The new function open_wmemstream acts like open_memstream,
6111 but uses a wchar_t wide character buffer.
6113 * The new function ppoll is an improved version of poll, similar to pselect.
6115 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6116 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6117 renameat, unlinkat, linkat, symlinkat, readlinkat.
6119 * New Linux kernel system calls: unshare,
6120 inotify_init, inotify_add_watch, inotify_rm_watch.
6122 * The euidaccess function is now also known by the alias eaccess,
6123 for compatibility with some other systems.
6125 * Timezone data updated to 2006b version.
6129 * The following bugs are resolved with this release:
6131 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6132 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6133 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6134 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6135 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6136 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6138 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6140 * As of this release, GCC 4 can be used to compile the C Library.
6142 * Timezone data updated to 2005m version.
6146 * The following bugs are resolved with this release:
6148 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6149 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6150 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6151 777, 787, 821, 822, 823, 825
6153 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6157 * Support for RFC 3678. Real implementations exist only for Linux so far.
6158 Implemented by Ulrich Drepper.
6160 * nscd can now cache entries persistently. Expiring entries are reloaded.
6161 For speedups the cache can be shared in memory with client processes.
6162 Implemented by Ulrich Drepper.
6164 * nscd can now perform SELinux checks.
6165 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6167 * getaddrinfo queries are now cached. Canonical name lookup is performed
6169 Implemented by Ulrich Drepper.
6171 * The nothrow function attribute is used when headers are used by gcc when
6172 compiling C code. This can avoid significant amounts of exception
6175 * The malloc functions perform more error checking and are stricter when
6176 it comes to reacting on errors. The default action is to terminate
6177 the process after showing an error message. Implemented by Ulrich Drepper.
6179 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6180 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6182 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6183 namespaces using the new function dlmopen(). This feature is of course,
6184 like most other dynamic loading functionality, not available in statically
6185 linked applications. Implemented by Ulrich Drepper.
6187 * Low-overhead boundary checking variants of string and some stdio functions
6188 were added. These are to be used in conjunction with a gcc patch by
6189 Jakub Jelinek which adds calls to these functions if possible.
6190 Implemented by Jakub Jelinek and Ulrich Drepper.
6192 * Old code for several operating systems and machine architectures that
6193 have not been in working condition in a long time have been removed from
6194 the main source tree maintained by the GNU C Library's maintainers.
6195 These files are now reside in the separate `ports' source module
6196 that is usable as an add-on when building the library.
6200 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6201 interrogate the dynamic linker, compatible with the Solaris interface.
6203 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6204 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6206 * getifaddrs now uses the netlink interface on Linux to get its information.
6207 Implemented by Thorsten Kukuk.
6209 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6210 Implemented by Ulrich Drepper.
6212 * support for non-executable stacks on x86 has been added. Changes mostly
6215 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6218 * getaddrinfo now performs destination address selection according to
6223 * Thread-safe interfaces for many functions that access locale data
6224 were added in version 2.3, but these features were omitted from NEWS.
6225 Many functions have variants with an `_l' suffix that take a `locale_t'
6226 object as a parameter rather than consulting the current locale.
6227 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6228 create and maintain `locale_t' objects. Additionally, the new function
6229 `uselocale' sets "the current locale" (as used by functions not so
6230 parameterized) set for an individual thread. These features were added
6231 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6233 * The functions getresuid, getresgid, setresuid, and setresgid, which
6234 have long been available on Linux, are now declared in <unistd.h>
6235 and are now also available on the Hurd.
6237 * ELF thread-local storage support (TLS) now works on x86-64.
6239 * The new dynamic string token $LIB is expanded in shared library names.
6240 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6242 * Aldy Hernandez contributed complete software floating point support for
6243 PowerPC machines with no FPU.
6245 * fexecve is implemented on Linux.
6247 * The `btowc' function should work at least twice as fast due to
6248 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6250 * With appropriate thread add-ons cancelable functions are now implemented
6251 in libc.so as well. No need to call the function in libpthread. This
6252 change allowed to finally disable the incorrect and expensive handling
6253 of weak definition in ld.so.
6255 * Yet more PLT entries in libc.so have been removed. We finally arrived
6256 at the bare minimum. Startup times improved appropriately.
6258 * Support for the new Linux/x86 system call interface was added. The
6259 AT_SYSINFO auxiliary vector entry is recognized and handled.
6263 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6266 * iconv (the program and the interface) now accepts empty names (excluding
6267 options like //TRANSLIT) to mean "use charset of current locale".
6269 * localedef can now transliterate characters in strings which are not in
6270 the provided charmap. The information from the input locale is used.
6272 * Prelinking support was added for ELF targets. This requires additional
6273 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6275 * Read-only stdio streams now use mmap to speed up operation by eliminating
6276 copying and buffer underflows. To use add 'm' to the mode string of
6277 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6279 * The malloc functions were completely rewritten by Wolfram Gloger based
6280 on Doug Lea's malloc-2.7.0.c.
6282 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6283 implementation of regex.
6285 * Bruno Haible upgraded the iconv and locale implementation to support
6288 * Contents of the LC_* and LANG environment variables in the CEN style are
6289 not recognized anymore. It never was used. Change by Ulrich Drepper.
6291 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6292 thread-local storage (TLS) ABI on some platforms.
6293 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6295 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6296 EUC-JISX0213, and TSCII.
6298 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6299 BSD-compatible interface for getting all network interface addresses.
6300 Implementation for IPv4 by Roland McGrath.
6302 * Loading of locale data is faster due to the introduction of a locale
6303 archive. Implemented by Roland McGrath and Ulrich Drepper.
6305 * Startup times are significantly reduced by not using exported functions
6306 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6309 * Steven Munroe contributed a port to PowerPC64/Linux.
6313 * The Hurd now uses the GNU libio implementation of stdio rather than the
6314 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6316 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6317 with the same behavior as the Linux system call of the same name.
6321 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6322 128-bit long double format.
6324 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6325 IBM1161, and IBM1162 charsets.
6327 * Andreas Jaeger contributed a port to x86-64/Linux.
6329 * Peter Bruin contributed a port to PowerPC/Hurd.
6331 * libc functions using I/O streams now can handle wide-oriented streams
6334 * optimizations in the dynamic linker. Binaries created by recent binutils
6335 versions start up quicker due to reduced time spent on relocations.
6337 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6341 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6342 asinh, atanh, j0 for the 128-bit long double format.
6344 * Bruno Haible updated all the code handling Unicode in some form to
6345 support Unicode 3.1.
6347 * Speed of regex for single-byte locales is back to previous levels.
6348 Patch by Isamu Hasegawa.
6350 * Alpha, SPARC, and IA-64 now also using floating stacks.
6352 * Startup time of internationalized applications greatly improved through
6353 iconv cache. Use iconvconfig to generate the cache file.
6354 Contributed by Ulrich Drepper.
6356 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6357 severe performance problems. Patch by David Mosberger.
6359 * The Hurd port got a lot more functionality like AIO, various stdio
6360 extensions, etc. Mainly done by Roland McGrath.
6362 * mtrace can now lookup symbols in shared libraries.
6366 * Intel's IA-64 math library is largely integrated. It provides fast and
6367 accurate implementatations for most basic and standard math functions
6368 in float, double, and long double format.
6370 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6371 and asin for the 96-bit long double format and asin, log, tan for the
6372 128-bit long double format.
6374 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6375 The basic double functions exist today. Contributed by Abraham Ziv
6376 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6377 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6379 * An asynchronous name lookup library was added. The interface is designed
6380 after POSIX AIO. The proposal was circulated beforehand to get comments.
6381 No negative ones came in. Implemented by Ulrich Drepper.
6383 * Port to S390/64bit contributed by Martin Schwidefsky
6384 <schwidefsky@de.ibm.com>.
6386 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6387 of functions for Linux/IA-64.
6389 * The RPC code is now thread safe. Threads can now use the same service
6390 of different services at the same time. Patch by Eric Norum
6391 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6393 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6394 family of functions for Linux/S390.
6396 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6397 of functions for Linux/x86.
6399 * Port to Linux/CRIS contributed by Axis Communications.
6403 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6404 we can now check for namespace violations and missing declarations. The
6405 result is that almost all headers are now Unix-compliant (as defined in
6406 the upcoming XPG6). The negative side is that some programs might need
6407 corrections, too, if they depend on the incorrect form of the headers in
6408 previous versions which defined too many symbols and included too many
6411 * regex now handles multibyte character sets correctly.
6412 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6414 * iconv (the program) does now conform to the upcoming XPG6 and handles
6415 charmaps. Instead of the charset names the path of charmaps can be
6416 provided and the conversion happens based on this data.
6417 Contributed by Ulrich Drepper.
6419 * The locale program now provides detailed information about the installed
6424 only lists the names of the supported locales
6428 provides details such as country, language, and codeset name.
6429 Contributed by Ulrich Drepper.
6433 * The gencat program now parses the input file according to the charset
6434 selected by the LC_CTYPE category. This is important for stateful
6435 character sets. To make generating catalogs easier there is a way
6436 to overwrite the charset selected by the locale: before the first
6437 message or $ quote line the catalog can contain a line like
6439 $ codeset=ISO-8859-2
6441 to select the charset (ISO-8859-2 in this case).
6443 Implemented by Shinya Hanataka and Ulrich Drepper.
6445 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6446 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6447 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6449 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6450 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6452 * The LANGUAGE environment variable is now ignored unless the locale is
6453 changed from the default "C" locale.
6455 * The usual bug fixes.
6459 * Greg McGary added runtime support for bounds checking using gcc's
6460 new -fbounded-pointers option. ix86 target is complete. PowerPC
6463 * Thorsten Kukuk added secure mode support to nscd.
6465 * The Berkeley db libraries have been removed.
6467 Related, the nss_db module is now in a separate package since it
6468 obviously requires a database library being available.
6470 * Wide character I/O streams implemented by Ulrich Drepper.
6472 * Functions from the extended socket API added by Ulrich Drepper.
6474 * Functions feenableexcept and fedisableexcept to control the
6475 behaviour of individual exceptions have been added by Andreas Jaeger.
6477 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6479 * The resolver code has been updated from bind 8.2.3-T5B which supports
6480 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6483 This change could in some situations effect backward compatibility. Since
6484 now `_res' is a thread-local instead of a global variable, modifying it
6485 in one thread does not have any effect in other threads.
6487 The resolver library was also extended to allow IPv6 as the transport
6488 protocol for the requests. This work was done by Stig Venaas.
6490 * Compatibility code for K&R C compilers has been removed from the
6491 header files. A ISO C compiler is needed to use the library
6492 (conforming to either C89 or C99 standard).
6494 * Complete rewrite of the localedef program to support multibyte character
6495 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6496 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6497 Implemented by Ulrich Drepper.
6499 Bruno Haible significantly improved the generation and use of the data
6500 structures for the wide character tables.
6502 * Plural handling in gettext implemented by Ulrich Drepper.
6504 * The utmp daemon has been removed.
6506 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6508 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6511 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6513 * POSIX barriers implemented by Kaz Kylheku.
6515 * POSIX spawn function family implemented by Ulrich Drepper.
6517 * POSIX spinlocks are now available.
6519 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6521 * the configure option --enable-kernel=X.Y.Z allows to strip out
6522 compatibility for kernel versions before X.Y.Z. This is currently only
6523 implemented for Linux.
6525 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6526 field sin6_scope_id. This means that all programs using IPv6 should be
6527 recompiled. Don't expect binary compatibility with previous glibc
6530 * various conversion modules for IBM character sets contributed by
6533 * IA-64 port by Jes Sorensen and HJ Lu.
6547 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6549 * New xdr functions are added; some rpc functions are now 64bit clean.
6551 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6553 * Fixed known incompatibilities with glibc 2.0.
6555 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6557 * Optimized a number of functions (especially the ELF dynamic loader).
6559 * Update timezone data files.
6561 * lots of charmaps corrections
6563 * some new locale definitions and charmaps
6568 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6569 conform to POSIX member type requirements. Symbol versions have been
6570 adjusted as needed within the library, and for direct use by applications,
6571 but there is potential for problems if third-party libraries use
6572 struct timeval as part of their interface. This does not present
6573 a problem for X and other "essential" system libraries.
6575 * An additional locale model to support C++ Standard Library locale
6576 model and probably more was implemented by Ulrich Drepper.
6578 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6581 * Miles Bader provided the `argp' function family to support hierarchical
6582 command line argument parsing, layered on top of getopt.
6584 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6586 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6589 * scanf recognizes the %a and %A format for scanning floating point numbers.
6591 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6592 information and interfaces for the available integer types.
6594 * about 130 new math functions were added to implement the ISO C9x math
6597 * the new header <complex.h> contains definitions of the complex math
6598 functions from ISO C 9X.
6600 * the new header <tgmath.h> defines generic macros to use complex or
6601 real valued functions.
6603 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6605 * Andreas Jaeger provided a test suite for the math library.
6607 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6609 * Ulrich Drepper added character set conversion functions (iconv).
6611 * Optimized string functions have been added.
6613 * The localedata addon is now part of glibc.
6615 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6617 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6618 daemon for NSS (nscd).
6620 Missing a better place here are some numbers on improvements. Under
6621 Linux 2.1.125 un-tar-ing the kernel sources takes
6625 using local files 12.19s 6.88s 22.91s
6627 using NIS 13.92s 8.91s 26.34s
6629 using NIS & nscd 10.37s 7.34s 25.30s
6631 using NIS+ 27.57s 30.37s 640.46s
6633 using NIS+ & nscd 10.25s 7.83s 26.51s
6635 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6637 Keep in mind that non-namelookup related operations dominate above times.
6638 It was just a common complain that using NIS+ unpacking the kernel is
6641 [1] The old nscd implementation is not available anymore since it was
6642 distributed with glibc up to version 2.0.98 and thus is now replaced.
6644 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6646 * Mark Kettenis provided a Hesiod NSS module.
6648 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6649 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6651 * rcmd can now handle netgroups (Dick Streefland).
6653 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6656 * Support for the IPv6 protocol has been added to the socket API, as per the
6657 latest draft standards.
6659 * Support for Linux 2.2 has been added.
6661 * Interface changes relative to the latest 2.0.x release:
6662 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6663 addseverity NEW: Unix98
6664 alphasort64 NEW: LFS
6665 argp_err_exit_status NEW: argp, GNU ext
6666 argp_error NEW: argp, GNU ext
6667 argp_failure NEW: argp, GNU ext
6668 argp_help NEW: argp, GNU ext
6669 argp_parse NEW: argp, GNU ext
6670 argp_program_bug_address NEW: argp, GNU ext
6671 argp_program_version NEW: argp, GNU ext
6672 argp_program_version_hook NEW: argp, GNU ext
6673 argp_state_help NEW: argp, GNU ext
6674 argp_usage NEW: argp, GNU ext
6675 authdes_create NEW: Secure RPC
6676 authdes_getucred NEW: Secure RPC
6677 authdes_pk_create NEW: Secure RPC
6678 backtrace NEW: GNU ext.
6679 backtrace_symbols NEW: GNU ext.
6680 backtrace_symbols_fd NEW: GNU ext.
6682 cacosf NEW: ISO C 9x
6683 cacosh NEW: ISO C 9x
6684 cacoshf NEW: ISO C 9x
6685 cacoshl NEW: ISO C 9x
6686 cacosl NEW: ISO C 9x
6693 casinf NEW: ISO C 9x
6694 casinh NEW: ISO C 9x
6695 casinhf NEW: ISO C 9x
6696 casinhl NEW: ISO C 9x
6697 casinl NEW: ISO C 9x
6699 catanf NEW: ISO C 9x
6700 catanh NEW: ISO C 9x
6701 catanhf NEW: ISO C 9x
6702 catanhl NEW: ISO C 9x
6703 catanl NEW: ISO C 9x
6704 cbc_crypt NEW: Secure RPC
6708 ccoshf NEW: ISO C 9x
6709 ccoshl NEW: ISO C 9x
6715 cimagf NEW: ISO C 9x
6716 cimagl NEW: ISO C 9x
6717 clearerr_locked REMOVED
6718 clntunix_create NEW: sunrpc ext
6720 clog10 NEW: ISO C 9x
6721 clog10f NEW: ISO C 9x
6722 clog10l NEW: ISO C 9x
6732 cprojf NEW: ISO C 9x
6733 cprojl NEW: ISO C 9x
6735 crealf NEW: ISO C 9x
6736 creall NEW: ISO C 9x
6741 csinhf NEW: ISO C 9x
6742 csinhl NEW: ISO C 9x
6745 csqrtf NEW: ISO C 9x
6746 csqrtl NEW: ISO C 9x
6750 ctanhf NEW: ISO C 9x
6751 ctanhl NEW: ISO C 9x
6753 des_setparity NEW: Secure RPC
6754 ecb_crypt NEW: Secure RPC
6755 endutxent NEW: Unix98
6757 exp10f NEW: ISO C 9x
6758 exp10l NEW: ISO C 9x
6762 fattach NEW: STREAMS
6763 fdetach NEW: STREAMS
6767 feclearexcept NEW: ISO C 9x
6768 fegetenv NEW: ISO C 9x
6769 fegetexceptflag NEW: ISO C 9x
6770 fegetround NEW: ISO C 9x
6771 feholdexcept NEW: ISO C 9x
6773 feraiseexcept NEW: ISO C 9x
6774 ferror_locked REMOVED
6775 fesetenv NEW: ISO C 9x
6776 fesetexceptflag NEW: ISO C 9x
6777 fesetround NEW: ISO C 9x
6778 fetestexcept NEW: ISO C 9x
6779 feupdateenv NEW: ISO C 9x
6780 fflush_locked REMOVED
6784 fgets_unlocked NEW: GNU ext.
6785 fileno_locked REMOVED
6797 fputc_locked REMOVED
6798 fputs_unlocked NEW: GNU ext.
6799 fread_unlocked NEW: GNU ext.
6804 fstatvfs NEW: Unix98
6808 ftruncate64 NEW: LFS
6810 fwrite_unlocked NEW: GNU ext.
6811 gai_strerror NEW: IPv6
6815 getchar_locked REMOVED
6817 getdate_err NEW: Unix98
6818 getdate_r NEW: GNU ext.
6820 getnameinfo NEW: IPv6
6821 getnetname NEW: Secure RPC
6822 getpmsg NEW: STREAMS
6823 getpt NEW: Unix98 PTY
6824 getrlimit64 NEW: LFS
6825 getutxent NEW: Unix98
6826 getutxid NEW: Unix98
6827 getutxline NEW: Unix98
6828 glob64 NEW: GNU ext.
6829 globfree64 NEW: GNU ext.
6830 gnu_get_libc_release NEW: GNU ext.
6831 gnu_get_libc_version NEW: GNU ext.
6832 grantpt NEW: Unix98 PTY
6833 host2netname NEW: Secure RPC
6835 iconv_close NEW: iconv
6836 iconv_open NEW: iconv
6837 if_freenameindex NEW: IPv6
6838 if_indextoname NEW: IPv6
6839 if_nameindex NEW: IPv6
6840 if_nametoindex NEW: IPv6
6841 in6addr_any NEW: IPv6
6842 in6addr_loopback NEW: IPv6
6843 inet6_isipv4mapped NEW: IPv6
6844 isastream NEW: STREAMS
6845 iswblank NEW: GNU ext.
6846 key_decryptsession NEW: Secure RPC
6847 key_decryptsession_pk NEW: Secure RPC
6848 key_encryptsession NEW: Secure RPC
6849 key_encryptsession_pk NEW: Secure RPC
6850 key_gendes NEW: Secure RPC
6851 key_get_conv NEW: Secure RPC
6852 key_secretkey_is_set NEW: Secure RPC
6853 key_setnet NEW: Secure RPC
6854 key_setsecret NEW: Secure RPC
6855 llrint NEW: ISO C 9x
6856 llrintf NEW: ISO C 9x
6857 llrintl NEW: ISO C 9x
6858 llround NEW: ISO C 9x
6859 llroundf NEW: ISO C 9x
6860 llroundl NEW: ISO C 9x
6865 lrintf NEW: ISO C 9x
6866 lrintl NEW: ISO C 9x
6867 lround NEW: ISO C 9x
6868 lroundf NEW: ISO C 9x
6869 lroundl NEW: ISO C 9x
6871 makecontext NEW: Unix98
6872 mempcpy NEW: GNU ext.
6875 modify_ldt NEW: kernel
6879 nearbyint NEW: ISO C 9x
6880 nearbyintf NEW: ISO C 9x
6881 nearbyintl NEW: ISO C 9x
6882 netname2host NEW: Secure RPC
6883 netname2user NEW: Secure RPC
6884 nexttoward NEW: ISO C 9x
6885 nexttowardf NEW: ISO C 9x
6886 nexttowardl NEW: ISO C 9x
6890 passwd2des NEW: Secure RPC
6892 pow10f NEW: GNU ext.
6893 pow10l NEW: GNU ext.
6896 printf_size NEW: GNU ext.
6897 printf_size_info NEW: GNU ext.
6898 profil_counter REMOVED
6899 pthread_mutexattr_getkind_np REPLACED
6900 pthread_mutexattr_setkind_np REPLACED
6901 ptsname NEW: Unix98 PTY
6902 ptsname_r NEW: Unix98 PTY
6904 putchar_locked REMOVED
6905 putgrent NEW: GNU ext.
6907 putpmsg NEW: STREAMS
6908 pututxline NEW: Unix98
6912 readdir64_r NEW: LFS
6913 remquo NEW: ISO C 9x
6914 remquof NEW: ISO C 9x
6915 remquol NEW: ISO C 9x
6917 roundf NEW: ISO C 9x
6918 roundl NEW: ISO C 9x
6920 scalbln NEW: ISO C 9x
6921 scalblnf NEW: ISO C 9x
6922 scalblnl NEW: ISO C 9x
6924 sendfile NEW: kernel
6925 setcontext NEW: Unix98
6926 setrlimit64 NEW: LFS
6927 setutxent NEW: Unix98
6929 sigignore NEW: Unix98
6930 sigqueue NEW: POSIX.1b
6931 sigrelse NEW: Unix98
6932 sigset NEW: POSIX.1b
6933 sigtimedwait NEW: POSIX.1b
6934 sigwaitinfo NEW: POSIX.1b
6935 sincos NEW: GNU ext.
6936 sincosf NEW: GNU ext.
6937 sincosl NEW: GNU ext.
6941 strcasestr NEW: GNU ext.
6942 strtoimax NEW: ISO C 9x
6943 strtoumax NEW: ISO C 9x
6944 strverscmp NEW: GNU ext.
6945 svcauthdes_stats NEW: Secure RPC
6946 svcunix_create NEW: sunrpc etx
6947 svcunixfd_create NEW: sunrpc ext
6948 swapcontext NEW: Unix98
6949 tcgetsid NEW: Unix98 PTY
6950 tdestroy NEW: GNU ext.
6951 tgamma NEW: ISO C 9x
6952 tgammaf NEW: ISO C 9x
6953 tgammal NEW: ISO C 9x
6957 truncf NEW: ISO C 9x
6958 truncl NEW: ISO C 9x
6960 unlockpt NEW: Unix98 PTY
6961 updwtmpx NEW: Unix98
6962 user2netname NEW: Secure RPC
6963 utmpxname NEW: Unix98
6964 versionsort NEW: GNU ext.
6965 versionsort64 NEW: GNU ext.
6967 wcscasecmp NEW: GNU ext.
6968 wcsncasecmp NEW: GNU ext.
6969 wcsnlen NEW: GNU ext.
6970 wcstoimax NEW: ISO C 9x
6971 wcstoll NEW: ISO C 9x
6972 wcstoull NEW: ISO C 9x
6973 wcstoumax NEW: ISO C 9x
6975 wordexp NEW: POSIX.2
6976 wordfree NEW: POSIX.2
6977 write_profiling REMOVED
6978 xdecrypt NEW: Secure RPC
6979 xdr_authdes_cred NEW: Secure RPC
6980 xdr_authdes_verf NEW: Secure RPC
6981 xdr_cryptkeyarg NEW: Secure RPC
6982 xdr_cryptkeyarg2 NEW: Secure RPC
6983 xdr_cryptkeyres NEW: Secure RPC
6984 xdr_getcredres NEW: Secure RPC
6985 xdr_key_netstarg NEW: Secure RPC
6986 xdr_key_netstres NEW: Secure RPC
6987 xdr_keybuf NEW: Secure RPC
6988 xdr_keystatus NEW: Secure RPC
6989 xdr_netnamestr NEW: Secure RPC
6990 xdr_sizeof NEW: Secure RPC
6991 xdr_unixcred NEW: sunrpc ext
6992 xencrypt NEW: Secure RPC
6993 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7004 * inet_ntoa is thread-safe
7006 * updwtmp is moved from libutil to libc
7008 * rewrite of cbrt function
7010 * update of timezone data
7024 * add atoll function
7026 * fix complex problems in Berkeley DB code
7028 * fix math functions
7032 * fixed lots of header problems (especially Linux/GNU specific)
7034 * dynamic loader preserves all registers
7036 * Roland McGrath provided support for handling of auxiliary objects in
7037 the ELF dynamic loader.
7039 * support for parallel builds is improved
7043 * GNU extensions are no longer declared by default. To enable them you
7044 must define the macro `_GNU_SOURCE' in your program or compile with
7047 * The library has changed from using GNU ld symbol aliases to using weak
7048 symbols where available. The ELF object file format supports weak
7049 symbols; GNU ld also supports weak symbols in the a.out format. (There
7050 is also now support for other GNU ld extensions in ELF. Use the
7051 `--with-elf' option to configure to indicate you have ELF, and
7052 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7053 of many files which contained only symbol aliases, reducing the size of
7054 the source and the compiled library; many other files were renamed to
7055 less cryptic names previously occupied by the symbol alias files.
7056 There is a new header file <elf.h> for programs which operate on
7057 files in the ELF format.
7059 * Converted to Autoconf version 2, so `configure' has more options.
7060 Run `configure --help' to see the details.
7062 * The library can now be configured to build profiling, highly-optimized
7063 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7064 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7065 `configure' enable building these extra libraries. The shared library is
7066 built by default when using both ELF and GNU ld. When shared libraries
7067 are enabled, the new library `-ldl' is available for arbitrary run-time
7068 loading of shared objects; its interface is defined in <dlfcn.h>. The
7069 new header file <link.h> gives access to the internals of the run-time
7070 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7071 application of same name on other systems and it provides information
7072 about dynamically linked binaries.
7074 * The C library now provides the run-time support code for profiling
7075 executables compiled with `-pg'. Programs can control the profiling code
7076 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7077 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7078 the support for this file format was contributed by David Mosberger-Tang.
7080 * The math code has been replaced with a math library based on fdlibm from
7081 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7082 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7083 functions. The math functions now reside in a separate library, so
7084 programs using them will need to use `-lm' their linking commands.
7086 * John C. Bowman contributed optimized ix87 assembler inline functions.
7088 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7089 mechanism similar to that found in Solaris 2. This is now used for the
7090 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7091 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7092 file controls what services are used for each individual database. This
7093 works by loading shared libraries with names specified in `nsswitch.conf',
7094 so service modules can be changed or added at any time without even
7095 relinking any program. Currently there are the file, db, and NIS based
7096 NSS services available.
7098 * The new functions `strtoq' and `strtouq' parse integer values from
7099 strings, like `strtol' and `strtoul', but they return `long long int' and
7100 `unsigned long long int' values, respectively (64-bit quantities).
7102 * The new functions `strtof' and `strtold' parse floating-point values from
7103 strings, like `strtod', but they return `float' and `long double' values,
7104 respectively (on some machines `double' and `long double' are the same).
7106 * Ulrich Drepper has contributed new implementations of the floating-point
7107 printing and reading code used in the `printf' family of functions and
7108 `strtod', `strtof', and `strtold'. These new functions are perfectly
7109 accurate, and much faster than the old ones.
7111 * The implementation of the POSIX locale model was completely rewritten by
7112 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7113 to compile the POSIX locale definition.
7115 * The former dummy implementations of the strcoll and strxfrm function are
7116 now replaced by fully functional code contributed by Ulrich Drepper. The
7117 collation information comes from the POSIX locale definitions.
7119 * The new header <langinfo.h> defines an interface for accessing
7120 various locale-dependent data (using the locale chosen with `setlocale').
7122 * Ulrich Drepper has contributed a new suite of functions for operation on
7123 wide-character and multibyte-character strings, in <wchar.h>;
7124 and classification and case conversion of wide characters, in <wctype.h>.
7125 These new functions are conforming to the ISO C, Amendment 1 specification.
7127 * There is now a second implementation of the standard I/O library available.
7128 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7129 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7131 * You can now use positional parameter specifications in format strings
7132 for the `printf' and `scanf' families of functions. For example,
7133 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7134 ``Number 6, Mr Jones''. This is mainly useful when providing different
7135 format strings for different languages, whose grammars may dictate
7136 different orderings of the values being printed. To support this
7137 feature, the interface for `register_printf_handler' has changed; see
7138 the header file <printf.h> for details.
7140 * The `printf' and `scanf' families of functions now understand a new
7141 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7142 to group numbers as indicated by the locale; for `scanf' and friends, this
7143 says to accept as valid only a number with all the proper grouping
7144 separators in the right places. In the default "C" locale, numbers are
7145 not grouped; but locales for specific countries will define the usual
7146 conventions (i.e. separate thousands with `,' in the US locale).
7148 * The pgrp functions have been regularized, slightly incompatibly but much
7149 less confusingly. The core functions are now `getpgid' and `setpgid',
7150 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7151 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7152 provided for compatibility. There is no longer an incompatible `getpgrp'
7153 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7155 * The new header file <fts.h> and suite of functions simplify programs that
7156 operate on directory trees. This code comes from 4.4 BSD.
7158 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7159 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7160 NSS scheme used in glibc.
7162 * There is a new malloc debugging hook `__memalign_hook'.
7164 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7165 `unsigned int' in <sys/types.h>. These are for compatibility only and
7166 their use is discouraged.
7168 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7169 done differently, so that it works even without GNU ld.
7171 * New function `euidaccess' checks allowed access to a file like `access',
7172 but using the effective IDs instead of the real IDs.
7174 * The time zone data files have been updated for the latest and greatest
7175 local time conventions of the countries of the world.
7177 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7180 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7181 for formatting floating-point numbers. They are provided only for
7182 compatibility; new programs should use `sprintf' instead. There are
7183 also equivalent function for the `long double' floating-point type and
7184 all functions also exist in a reentrant form.
7186 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7187 functions for maintaining the login-record files (primarily of use to
7188 system programs such as `login'), and convenient functions for
7189 allocating and initializing a pseudo-terminal (pty) device.
7191 * Ulrich Drepper has contributed new support for System V style
7192 shared memory and IPC on systems that support it.
7194 * Ulrich Drepper has contributed several miscellaneous new functions found
7195 in System V: The `hsearch' family of functions provide an effective
7196 implementation of hash tables; `a64l' and `l64a' provide a very simple
7197 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7200 * Ulrich Drepper has contributed new reentrant counterparts for the
7201 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7203 * Ulrich Drepper has contributed new, highly-optimized versions of several
7204 string functions for the i486/Pentium family of processors.
7206 * Ulrich Drepper has updated the Linux-specific code, based largely
7207 on work done in Hongjiu Lu's version of GNU libc for Linux.
7208 The GNU library now supports Linux versions 2.0.10 and later,
7209 using the ELF object file format (i[3456]86-*-linux).
7211 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7213 * David Mosberger-Tang and Richard Henderson have ported the C library
7214 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7215 dynamic linking support for ELF/Alpha.
7217 * Richard Henderson contributed several Alpha optimized assembler function
7218 for arithmetic and string handling.
7220 * Ulrich Drepper has contributed a new set of message catalog functions to
7221 support multiple languages using the <libintl.h> interface, for use with
7222 his new package GNU gettext. Translation volunteers have contributed
7223 catalogs of the library's messages in Spanish, German, and Korean.
7225 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7226 program and the `catgets' function for reading the catalog files it
7227 creates. (The <libintl.h> interface is preferred; we include the
7228 <nl_types.h> interface using `catgets' only for source compatibility with
7229 programs already written to use it.)
7231 * New header file <values.h> gives SVID-compatible names for <limits.h>
7234 * Various new macros, declarations, and small header files for compatibility
7237 * New function `group_member' is a convenient way to check if a process has
7238 a given effective group ID.
7240 * When using GCC 2.7 and later, the socket functions are now declared in a
7241 special way so that passing an argument of type `struct sockaddr_in *',
7242 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7243 `struct sockaddr *' type, does not generate a type-clash warning.
7245 * New function `error' declared in header file <error.h> is a convenient
7246 function for printing error messages and optionally exiting; this is the
7247 canonical function used in GNU programs. The new functions `err', `warn',
7248 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7249 doing the same thing.
7251 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7252 POSIX.2 `glob' function to do ~ and {...} expansion.
7254 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7255 `clearenv' which is used in POSIX.9 is also available.
7257 * New function `getsid' returns session ID number on systems that support it.
7259 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7260 files <db.h> and <mpool.h> provide a rich set of functions for several
7261 types of simple databases stored in memory and in files, and <ndbm.h> is
7262 an old `ndbm'-compatible interface using the `db' functions. Link with
7263 `-ldb' to get these functions.
7265 * New macro `strdupa' copies a string like `strdup', but uses local stack
7266 space from `alloca' instead of dynamic heap space from `malloc'.
7268 * New function `strnlen' is like `strlen' but searches only a given maximum
7269 number of characters for the null terminator. `stpncpy', `strndup' and
7270 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7273 * New function `statfs' in header <sys/statfs.h>.
7275 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7276 provide convenient functions for operating on blocks of null-terminated
7279 * A new suite of functions in <utmp.h> handle all the details of reading
7280 and writing the utmp file.
7282 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7285 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7286 completely POSIX compliant and also implemented the extended functionality
7287 to handle alternate digit representation and alternate era date formats.
7289 * Ulrich Drepper provided an implementation of the `strptime' function
7290 defined in XPG4.2 which transforms a string into a `struct tm' value.
7292 * Paul Eggert provided the tzselect shell script as part of the timezone
7293 code. The shell script makes it easy to select the correct timezone
7296 * The implementation of the malloc family of functions is completely replaced
7297 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7298 The implementation uses the mmap function (if available) and it is
7299 optimized for the use in multi threaded programs.
7301 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7302 functions. This new functionality is usable by specifying a special
7303 salt string and it is compatible with implementation on *BSD systems.
7305 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7306 `getsubopt' to handle second level command line options, `bsd_signal'
7307 to access BSD style `signal' functionality, the obsolete `regexp' style
7310 * the `lchown' function is available on system which support this
7313 * The implementation of the shadow password handling function was contributed
7316 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7318 * POSIX.1g support was added. The <sys/select.h> header is available,
7319 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7320 implementation of `getaddrinfo'.
7324 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7326 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7327 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7329 * The new function `daemon' from 4.4 BSD is useful for server programs that
7330 want to put themselves in the background.
7332 * Joel Sherrill has contributed support for several standalone boards that
7333 run without an operating system.
7335 * `printf', `scanf' and friends now accept a `q' type modifier for long
7336 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7338 * All of the code taken from BSD (notably most of the math and networking
7339 routines) has been updated from the BSD 4.4-Lite release.
7341 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7343 * The new functions `getdomainname' and `setdomainname' fetch or change the
7344 YP/NIS domain name. These are system calls which exist on systems which
7347 * The time zone data files have been updated for the latest international
7350 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7351 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7355 * The C library now includes support for Sun RPC, from Sun's free
7356 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7357 are included. (There is still no support for YP.)
7359 * Tom Quinn has contributed a port of the C library to SGI machines running
7360 Irix 4 (mips-sgi-irix4).
7362 * The new `lockf' function is a simplified interface to the locking
7363 facilities of `fcntl', included for compatibility.
7365 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7367 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7369 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7372 * The error message printed by `assert' for a failed assertion now includes
7373 the name of the program (if using GNU ld) and the name of the calling
7374 function (with versions of GCC that support this).
7376 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7378 * The library now includes the <sys/mman.h> header file and memory
7379 management functions `mmap', `munmap', `mprotect', `msync', and
7380 `madvise', on systems that support those facilities.
7382 * The interface for `mcheck' has changed slightly: the function called to
7383 abort the program when an allocation inconsistency is detected now takes
7384 an argument that indicates the type of failure. The new function
7385 `mprobe' lets you request a consistency check for a particular block at
7386 any time (checks are normally done only when you call `free' or `realloc'
7389 * It is now possible to easily cross-compile the C library, building on one
7390 system a library to run on another machine and/or operating system. All
7391 you need to do is set the variable `HOST_CC' in `configparms' to the
7392 native compiler for programs to run on the machine you are building on (a
7393 few generator programs are used on Unix systems); set `CC' to the
7396 * The new function `fexecve' (only implemented on the GNU system) executes
7397 a program file given a file descriptor already open on the file.
7401 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7402 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7404 * You can set the variable `libprefix' in `configparms' to specify a prefix
7405 to be prepended to installed library files; this makes it easy to install
7406 the GNU C library to be linked as `-lgnuc' or whatever.
7408 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7409 copies a limited number of characters from a string, and returns the
7410 address of the last character written.
7412 * You no longer need to check for whether the installed `stddef.h' is
7413 compatible with the GNU C library. configure now checks for you.
7415 * You can now define a per-stream `fileno' function to convert the
7416 stream's cookie into an integral file descriptor.
7418 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7419 allocates zero bytes of storage, and returns a unique pointer which
7420 you can pass to `realloc' or `free'. The behavior is undefined if
7421 you dereference this pointer.
7423 * The C library now runs on Sony NEWS m68k machines running either
7424 NewsOS 3 or NewsOS 4.
7426 * The new `syscall' function is a system-dependent primitive function
7427 for invoking system calls. It has the canonical behavior on Unix
7428 systems, including unreliable return values for some calls (such as
7429 `pipe', `fork' and `getppid').
7431 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7432 to `EAGAIN', which is the preferred name. On systems whose kernels
7433 use two distinct codes, the C library now translates EWOULDBLOCK to
7434 EAGAIN in every system call function.
7438 * The GNU C Library Reference Manual is now distributed with the library.
7439 `make dvi' will produce a DVI file of the printed manual.
7440 `make info' will produce Info files that you can read on line using C-h i
7441 in Emacs or the `info' program.
7442 Please send comments on the manual to bug-glibc-manual@gnu.org.
7444 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7446 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7448 * Jason Merrill has contributed a port to the Sequent Symmetry running
7449 Dynix version 3 (i386-sequent-dynix).
7451 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7452 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7454 * New function `memory_warnings' lets you arrange to get warnings when
7455 malloc is running out of memory to allocate, like Emacs gives you.
7457 * The C library now contains the relocating allocator used in Emacs 19 for
7458 its editing buffers. This allocator (ralloc) minimizes allocation
7459 overhead and fragmentation by moving allocated regions around whenever it
7460 needs to. You always refer to a ralloc'd region with a "handle" (a
7461 pointer to a pointer--an object of type `void **').
7463 * There is a new `printf' format: `%m' gives you the string corresponding
7464 to the error code in `errno'.
7466 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7467 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7468 pass, the `a' modifier says to fill in a `char **' you pass with a
7471 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7472 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7473 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7475 * `mkstemp' is a traditional Unix function to atomically create and open a
7476 uniquely-named temporary file.
7480 * The standard location for the file that says what the local timezone is
7481 has changed again. It is now `/usr/local/etc/localtime' (or more
7482 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7484 * The distribution no longer contains any files with names longer than 14
7487 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7488 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7490 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7494 * The configuration process has changed quite a bit. The `configure'
7495 script is now used just like the configuration scripts for other GNU
7496 packages. The `sysdeps' directory hierarchy is much rearranged.
7497 The file `INSTALL' explains the new scheme in detail.
7499 * The header files no longer need to be processed into ANSI C and
7500 traditional C versions. There is just one set of files to install, and
7501 it will work with ANSI or old C compilers (including `gcc -traditional').
7503 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7504 MIPS DECStation running Ultrix 4.
7506 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7507 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7508 made itself into a shared library.
7510 * Yet further improved support for the i386, running 4.3 BSD-like systems
7511 (such as Mach 3 with the Unix single-server), or System V.
7513 * New function `strncasecmp' to do case-insensitive string comparison
7514 with limited length.
7516 * New function `strsep' is a reentrant alternative to `strtok'.
7518 * New functions `scandir' and `alphasort' for searching directories.
7520 * New function `setenv' is a better interface to `putenv'.
7522 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7523 function for traversing a directory tree.
7525 * The GNU obstack package is now also part of the C library.
7526 The new function `open_obstack_stream' creates a stdio stream that
7527 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7528 formatted output directly to an obstack.
7530 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7531 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7533 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7535 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7536 things to your strings.
7538 * There are some new test programs: test-fseek, testmb, and testrand.
7540 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7541 These ports are not finished, but are a good starting place for really
7542 supporting those systems.
7544 * `/etc/localtime' is now the standard location for the file that says what
7545 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7546 This follows the general principle that `/etc' is the place for all local
7547 configuration files.
7549 * The C library header files now use `extern "C"' when used by the C++
7550 compiler, so the C library should now work with C++ code.
7552 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7553 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7556 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7557 function which uses the `merge sort' algorithm, and is said to be
7558 significantly faster than the old GNU `qsort' function. Merge sort is
7559 now the standard `qsort' function. The new algorithm can require a lot
7560 of temporary storage; so, the old sorting function is called when the
7561 required storage is not available.
7563 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7564 provides the Unix `crypt' function, plus some other entry points.
7566 * The code and header files taken from 4.4 BSD have been updated with the
7567 latest files released from Berkeley.
7569 ----------------------------------------------------------------------
7572 Permission is granted to anyone to make or distribute verbatim copies
7573 of this document as received, in any medium, provided that the
7574 copyright notice and this permission notice are preserved,
7575 thus giving the recipient permission to redistribute in turn.
7577 Permission is granted to distribute modified versions
7578 of this document, or of portions of it,
7579 under the above conditions, provided also that they
7580 carry prominent notices stating who last changed them.
7583 version-control: never