1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2023 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * struct statvfs now has an f_type member, equal to the f_type statfs member;
13 on the Hurd this was always available under a reserved name,
14 and under Linux a spare has been allocated: it was always zero
15 in previous versions of glibc, and zero is not a valid result.
17 * On Linux, the functions posix_spawnattr_getcgroup_np and
18 posix_spawnattr_setcgroup_np have been added, along with the
19 POSIX_SPAWN_SETCGROUP flag. They allow posix_spawn and posix_spawnp
20 to set the cgroupv2 in the new process in a race-free manner. These
21 functions are GNU extensions and require a kernel with clone3 support.
23 * On Linux, the pidfd_spawn and pidfd_spawp functions have been added.
24 They have a similar prototype and semantic as posix_spawn, but instead of
25 returning a process ID, they return a file descriptor that can be used
26 along other pidfd functions (like pidfd_send_signal, poll, or waitid).
27 The pidfd functionality avoids the issue of PID reuse with the traditional
28 posix_spawn interface.
30 * On Linux, the pidfd_getpid function has been added. It allows retrieving
31 the process ID associated with the process file descriptor created by
32 pid_spawn, fork_np, or pidfd_open.
34 * scanf-family functions now support the wN format length modifiers for
35 arguments pointing to types intN_t, int_leastN_t, uintN_t or
36 uint_leastN_t (for example, %w32d to read int32_t or int_least32_t in
37 decimal, or %w32x to read uint32_t or uint_least32_t in hexadecimal)
38 and the wfN format length modifiers for arguments pointing to types
39 int_fastN_t or uint_fastN_t, as specified in draft ISO C2X.
41 * A new tunable, glibc.mem.decorate_maps, can be used to add additional
42 information on underlying memory allocated by the glibc (for instance,
43 on thread stack created by pthread_create or memory allocated by
46 Deprecated and removed features, and other changes affecting compatibility:
48 * The ldconfig program now skips file names containing ';' or ending in
49 ".tmp", to avoid examining temporary files created by the RPM and dpkg
52 * libcrypt has been removed from the GNU C Library. The configure
53 options "--enable-crypt" and "--enable-nss-crypt" are no longer
54 available. <crypt.h>, libcrypt.a, and libcrypt.so.1 will not be
55 installed. For now <unistd.h> continues to declare the crypt
56 function by default, to avoid introducing vulnerabilities into
57 existing applications due to a missing prototype. This declaration
58 is deprecated and may be removed in a future glibc release.
60 The replacement for libcrypt is libxcrypt, maintained separately from
61 GNU libc, but available under compatible licensing terms, and providing
62 binary backward compatibility with the former libcrypt. It is currently
63 distributed from <https://github.com/besser82/libxcrypt/>.
65 As a consequence of this removal, GNU libc no longer makes any use of
66 the NSS cryptography library (Network Security Services; not to be
67 confused with Name Service Switch). Distributors of binary packages
68 of GNU libc are advised to check whether their build processes can be
71 Changes to build and runtime requirements:
73 * Building on LoongArch requires at a minimum binutils 2.41 for vector
76 Security related changes:
78 CVE-2023-4527: If the system is configured in no-aaaa mode via
79 /etc/resolv.conf, getaddrinfo is called for the AF_UNSPEC address
80 family, and a DNS response is received over TCP that is larger than
81 2048 bytes, getaddrinfo may potentially disclose stack contents via
82 the returned address data, or crash.
84 CVE-2023-4806: When an NSS plugin only implements the
85 _gethostbyname2_r and _getcanonname_r callbacks, getaddrinfo could use
86 memory that was freed during buffer resizing, potentially causing a
87 crash or read or write to arbitrary memory.
89 CVE-2023-5156: The fix for CVE-2023-4806 introduced a memory leak when
90 an application calls getaddrinfo for AF_INET6 with AI_CANONNAME,
91 AI_ALL and AI_V4MAPPED flags set.
93 CVE-2023-4911: If a tunable of the form NAME=NAME=VAL is passed in the
94 environment of a setuid program and NAME is valid, it may result in a
95 buffer overflow, which could be exploited to achieve escalated
96 privileges. This flaw was introduced in glibc 2.34.
98 The following bugs are resolved with this release:
100 [The release manager will add the list generated by
101 scripts/list-fixed-bugs.py just before the release.]
107 * When C2X features are enabled and the base argument is 0 or 2, the
108 following functions support binary integers prefixed by 0b or 0B as
109 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
110 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
111 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
112 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
113 following functions support binary integers prefixed by 0b or 0B as
114 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
115 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
116 functions also support the %b format for binary integers, with or
117 without such a prefix and independent of standards mode.
119 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
122 * printf-family functions now support the wN format length modifiers for
123 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
124 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
125 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
126 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
127 specified in draft ISO C2X.
129 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
130 Transparent Huge Pages (THP) in stack allocation at pthread_create.
132 * Support for x86_64 running on Hurd has been added. This port requires
133 as least binutils 2.40 and GCC 13:
137 * Vector math library libmvec support has been added to AArch64. It
138 requires GCC version >= 10.1.0. It can be disabled via
139 "--disable-mathvec", however that is not a supported configuration as
140 it changes the ABI. The symbol names follow the AArch64 vector ABI,
141 they are declared in math.h and have to be called manually at this point.
143 * The strlcpy and strlcat functions have been added. They are derived
144 from OpenBSD, and are expected to be added to a future POSIX version.
146 * A new configure option, "--enable-fortify-source", can be used to build the
147 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
148 provided, or is set to the highest value supported by the compiler. If not
149 explicitly enabled, then fortify source is forcibly disabled so to keep
150 original behavior unchanged.
152 Deprecated and removed features, and other changes affecting compatibility:
154 * libcrypt is no longer built by default; one may use the "--enable-crypt"
155 option to build libcrypt. libcrypt is likely to be removed from the
156 GNU C Library in a future release, so it is recommended that
157 applications port away from it to an alternative such as libxcrypt.
159 * In the Linux kernel for the hppa/parisc architecture some of the
160 MADV_XXX constants were changed to have the same values as the other
161 architectures. New programs compiled with this glibc version and which
162 use the madvise call will require at least Linux kernel version 6.2,
163 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
164 5.4.228, 4.19.270 or 4.14.303.
166 * The "--disable-experimental-malloc" option is no longer available. The
167 per-thread cache can still be disabled per-application using tunables
168 (glibc.malloc.tcache_count set to zero).
170 * The configure option "--enable-tunables" has been removed. The tunable
171 feature is now always enabled.
173 Changes to build and runtime requirements:
175 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
178 Security related changes:
180 CVE-2023-25139: When the printf family of functions is called with a
181 format specifier that uses an <apostrophe> (enable grouping) and a
182 minimum width specifier, the resulting output could be larger than
183 reasonably expected by a caller that computed a tight bound on the
184 buffer size. The resulting larger than expected output could result
185 in a buffer overflow in the printf family of functions.
187 The following bugs are resolved with this release:
189 [178] string: Please add strlcpy and strlcat (attached)
190 [14697] nptl: Behavior of exit is nonconformant with respect to
192 [15142] stdio: Missing locking in _IO_cleanup
193 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
194 [18906] stdio: fopen: ccs value may affect open mode
195 [24466] stdio: Feature request: provide special printf formats for
197 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
198 [28519] libc: system and popen should pass "--" between /bin/sh and
200 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
201 [29591] string: wcsnlen length can overflow in page cross case.
202 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
203 [30068] stdio: incorrect printf output for integers with thousands
204 separator and width field (CVE-2023-25139)
205 [30111] time: support_descriptors_list fails after 2038 on 32 bits
207 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
208 symlink for libraries without soname
209 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
211 [30156] time: Potential ntp_gettime abi break
212 [30235] libc: Missing fallback in getlogin if loginuid is unset
213 [30258] dynamic-link: sprof cannot read and display shared object
214 profiling data correctly
215 [30263] libc: Add test coverage for abs(), labs(), and llabs().
216 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
217 [30402] libc: FAIL: elf/tst-glibcelf
218 [30425] dynamic-link: Symbol lookup during dlclose may fail
220 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
221 [30477] libc: [RISCV]: time64 does not work on riscv32
222 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
224 [30527] network: resolv_conf lock not unlocked on allocation failure
225 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
227 [30555] string: strerror can incorrectly return NULL
228 [30579] malloc: trim_threshold in realloc lead to high memory usage
229 [30662] nscd: Group and password cache use errno in place of errval
235 * The getent tool now supports the --no-addrconfig option. The output of
236 getent with --no-addrconfig may contain addresses of families not
237 configured on the current host i.e. as-if you had not passed
238 AI_ADDRCONFIG to getaddrinfo calls.
240 Deprecated and removed features, and other changes affecting compatibility:
242 * The dynamic linker no longer loads shared objects from the "tls"
243 subdirectories on the library search path or the subdirectory that
244 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
245 search mechanism, which was deprecated in version 2.33.
247 Security related changes:
249 CVE-2022-39046: When the syslog function is passed a crafted input
250 string larger than 1024 bytes, it reads uninitialized memory from the
251 heap and prints it to the target log file, potentially revealing a
252 portion of the contents of the heap.
254 The following bugs are resolved with this release:
256 [12154] network: Cannot resolve hosts which have wildcard aliases
257 [12165] libc: readdir: Do not skip entries with zero d_ino values
258 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
259 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
260 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
261 AF_INET6 address (ie docker)
262 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
264 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
265 [28937] dynamic-link: New DSO dependency sorter does not put new map
267 [29249] libc: csu/libc-tls.c:202: undefined reference to
268 `_startup_fatal_not_constant'
269 [29305] network: Inefficient buffer space usage in nss_dns for
270 gethostbyname and other functions
271 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
272 [29402] nscd: nscd: No such file or directory
273 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
275 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
276 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
278 [29463] math: math/test-float128-y1 fails on x86_64
279 [29485] build: Make hangs when the test misc/tst-pidfile returns
281 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
283 [29499] build: Check failed on misc/tst-glibcsyscalls while building
284 for RISCV64 on a unmatched hardware
285 [29501] build: Check failed on stdlib/tst-strfrom while building for
286 RISCV64 on a unmatched hardware
287 [29502] libc: alpha sys/acct.h out of date
288 [29514] build: Need to use -fPIE not -fpie
289 [29528] dynamic-link: __libc_early_init not called after dlmopen that
291 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
292 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
294 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
296 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
298 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
299 [29576] build: librtld.os: in function `_dl_start_profile':
300 (.text+0x9444): undefined reference to `strcpy'
301 [29578] libc: Definition of SUN_LEN() is wrong
302 [29583] build: iconv failures on 32bit platform due to missing large
304 [29600] dynamic-link: dlmopen hangs after loading certain libraries
305 [29604] localedata: Update locale data to Unicode 15.0.0
306 [29605] nscd: Regression in NSCD backend of getaddrinfo
307 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
309 [29611] string: Optimized AVX2 string functions unconditionally use
311 [29624] malloc: errno is not cleared when entering main
312 [29638] libc: stdlib: arc4random fallback is never used
313 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
315 [29698] build: Configuring for AArch32 on ARMv8+ disables
317 [29727] locale: __strtol_internal out-of-bounds read when parsing
319 [29730] libc: broken y2038 support in fstatat on MIPS N64
320 [29746] libc: ppoll() does not switch to __ppoll64 when
321 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
322 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
323 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
324 aux.S: No such file or directory)
325 [29864] libc: __libc_start_main() should obtain program headers
326 address (_dl_phdr) from the auxv, not the ELF header.
327 [29951] time: daylight variable not set correctly if last DST change
328 coincides with offset change
329 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
330 length in fortify mode
336 * Support for DT_RELR relative relocation format has been added to
337 glibc. This is a new ELF dynamic tag that improves the size of
338 relative relocations in shared object files and position independent
339 executables (PIE). DT_RELR generation requires linker support for
340 -z pack-relative-relocs option, which is supported for some targets
341 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
343 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
344 have been added. The pidfd functionality provides access to a process
345 while avoiding the issue of PID reuse on traditional Unix systems.
347 * On Linux, the process_madvise function has been added. It has the
348 same functionality as madvise but alters the target process identified
351 * On Linux, the process_mrelease function has been added. It allows a
352 caller to release the memory of a dying process. The release of the
353 memory is carried out in the context of the caller, using the caller's
354 CPU affinity, and priority with CPU usage accounted to the caller.
356 * The “no-aaaa” DNS stub resolver option has been added. System
357 administrators can use it to suppress AAAA queries made by the stub
358 resolver, including AAAA lookups triggered by NSS-based interfaces
359 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
360 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
361 produce IPv6 addresses, and configured IPv6 name servers are still
362 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
363 are translated to A queries. The new resolver option is intended
364 primarily for diagnostic purposes, to rule out that AAAA DNS queries
365 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
366 validation by applications.
368 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
369 and mount_setattr have been added. They are part of the new Linux kernel
370 mount APIs that allow applications to more flexibly configure and operate
371 on filesystem mounts. The new mount APIs are specifically designed to work
374 * localedef now accepts locale definition files encoded in UTF-8.
375 Previously, input bytes not within the ASCII range resulted in
376 unpredictable output.
378 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
379 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
380 Support for the char8_t typedef has been added per the ISO C2X N2653
381 proposal. The functions are declared in uchar.h in C2X mode or when the
382 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
383 The char8_t typedef is declared in uchar.h in C2X mode or when the
384 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
385 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
387 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
388 added. The functions wrap getrandom and/or /dev/urandom to return high-
389 quality randomness from the kernel.
391 * Support for LoongArch running on Linux has been added. This port requires
392 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
395 - loongarch64-linux-gnu
397 The LoongArch ABI is 64-bit little-endian.
399 Deprecated and removed features, and other changes affecting compatibility:
401 * Support for prelink will be removed in the next release; this includes
402 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
403 variables and their functionality in the dynamic loader.
405 * The Linux kernel version check has been removed along with the
406 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
407 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
408 when libc.so is issued directly.
410 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
412 The following bugs are resolved with this release:
414 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
415 return different result with versioned "foo"
416 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
418 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
419 ./exe and ld.so adjusts argv on the stack
420 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
422 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
423 consuming the second byte of certain double byte characters
424 [25812] stdio: Libio vtable protection is sometimes only partially
426 [27054] libc: pthread_atfork handlers that call pthread_atfork
428 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
430 [28128] build: declare_symbol_alias doesn't work for assembly codes
431 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
432 [28752] nss: Segfault in getpwuid when stat fails
433 [28815] libc: realpath should not copy to resolved buffer on error
434 [28828] stdio: fputwc crashes
435 [28838] libc: FAIL: elf/tst-p_align3
436 [28845] locale: ld-monetary.c should be updated to match ISO C and
438 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
440 [28852] libc: getaddrinfo leaks memory with AI_ALL
441 [28853] libc: tst-spawn6 changes current foreground process group
442 (breaks test isolation)
443 [28857] libc: FAIL: elf/tst-audit24a
444 [28860] build: --enable-kernel=5.1.0 build fails because of missing
445 __convert_scm_timestamps
446 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
447 inaccurate without /sys and /proc
448 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
450 [28880] libc: Program crashes if date beyond 2038
451 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
452 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
453 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
454 rtm variants when avoiding overflow
455 [28922] build: The .d dependency files aren't always generated
456 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
458 [28936] build: nm: No such file
459 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
460 [28953] nss: NSS lookup result can be incorrect if function lookup
462 [28970] math: benchtest: libmvec benchmark doesn't build with make
464 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
465 /sys/devices/system/cpu/possible
466 [28993] libc: closefrom() iterates until max int if no access to
468 [28996] libc: realpath fails to copy partial result to resolved buffer
470 [29027] math: [ia64] fabs fails with sNAN input
471 [29029] nptl: poll() spuriously returns EINTR during thread
472 cancellation and with cancellation disabled
473 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
474 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
475 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
476 is promoted to global scope
477 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
478 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
479 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
481 [29097] time: fchmodat does not handle 64 bit time_t for
483 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
485 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
486 [29162] string: [PATCH] string.h syntactic error:
487 include/bits/string_fortified.h:110: error: expected ',' or ';'
488 before '__fortified_attr_access'
489 [29165] libc: [Regression] broken argv adjustment
490 [29187] dynamic-link: [regression] broken argv adjustment for nios2
491 [29193] math: sincos produces a different output than sin/cos
492 [29197] string: __strncpy_power9() uses uninitialised register vs18
493 value for filling after \0
494 [29203] libc: daemon is not y2038 aware
495 [29204] libc: getusershell is not 2038 aware
496 [29207] libc: posix_fallocate fallback implementation is not y2038
498 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
499 [29209] libc: isfdtype is not y2038 aware
500 [29210] network: ruserpass is not y2038 aware
501 [29211] libc: __open_catalog is not y2038 aware
502 [29213] libc: gconv_parseconfdir is not y2038 aware
503 [29214] nptl: pthread_setcanceltype fails to set type
504 [29225] network: Mistyped define statement in socket/sys/socket.h in
506 [29274] nptl: __read_chk is not a cancellation point
507 [29279] libc: undefined reference to `mbstowcs_chk' after
508 464d189b9622932a75302290625de84931656ec0
509 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
510 correct for !__ASSUME_TIME64_SYSCALLS
511 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
512 missing on microblaze with largefile
518 * Unicode 14.0.0 Support: Character encoding, character type info, and
519 transliteration tables are all updated to Unicode 14.0.0, using
520 generator scripts contributed by Mike FABIAN (Red Hat).
522 * Bump r_version in the debugger interface to 2 and add a new field,
523 r_next, support multiple namespaces.
525 * Support for the C.UTF-8 locale has been added to glibc. The locale
526 supports full code-point sorting for all valid Unicode code points. A
527 limitation in the framework for fnmatch, regexec, and regcomp requires
528 a compromise to save space and only ASCII-based range expressions are
529 supported for now (see bug 28255). The full size of the locale is
530 only ~400KiB, with 346KiB coming from LC_CTYPE information for
531 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
532 in various downstream distributions. The locale is not built into
533 glibc, and must be installed.
535 * <math.h> functions that round their results to a narrower type, and
536 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
537 18661-3:2015 and draft ISO C2X:
539 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
540 fMxsqrtfN and fMxsqrtfNx functions.
542 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
545 * <math.h> functions for floating-point maximum and minimum,
546 corresponding to new operations in IEEE 754-2019, and corresponding
547 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
548 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
549 fminimum_mag, fminimum_mag_num and corresponding functions for float,
550 long double, _FloatN and _FloatNx.
552 * <math.h> macros for single-precision float constants are added as a
553 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
554 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
557 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
558 predefined as specified in TS 18661-1:2014.
560 * The exp10 functions in <math.h> now have a corresponding type-generic
563 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
565 * printf-family functions now support the %b format for output of
566 integers in binary, as specified in draft ISO C2X, and the %B variant
567 of that format recommended by draft ISO C2X.
569 * A new DSO sorting algorithm has been added in the dynamic linker that uses
570 topological sorting by depth-first search (DFS), solving performance issues
571 of the existing sorting algorithm when encountering particular circular
572 object dependency cases.
574 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
575 the two DSO sorting algorithms. The default setting of '2' uses the
576 new DFS-based algorithm. The setting '1' switches to the old
577 algorithm used in glibc 2.33 and earlier.
579 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
580 to be used by compilers for optimizing usage of 'memcmp' when its
581 return value is only used for its boolean status.
583 * Support for automatically registering threads with the Linux rseq
584 system call has been added. This system call is implemented starting
585 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
586 operations on per-cpu data. It allows user-space to perform updates
587 on per-cpu data without requiring heavy-weight atomic operations.
588 Automatically registering threads allows all libraries, including
589 libc, to make immediate use of the rseq support by using the
590 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
591 variables. The GNU C Library manual has details on integration of
592 Restartable Sequences.
594 * A symbolic link to the dynamic linker is now installed under
595 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
597 * All programs and the testsuite in glibc are now built as position independent
598 executables (PIE) by default on toolchains and architectures that support it.
599 Further, if the toolchain and architecture supports it, even static programs
600 are built as PIE and the resultant glibc can be used to build static PIE
601 executables. A new option --disable-default-pie has been added to disable
602 this behavior and get a non-PIE build. This option replaces
603 --enable-static-pie, which no longer has any effect on the build
606 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
607 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
608 or to use huge pages directly with mmap calls with the MAP_HUGETLB
609 flags). The former can improve performance when Transparent Huge Pages
610 is set to 'madvise' mode while the latter uses the system reserved
613 * The printf family of functions now handles the flagged %#m conversion
614 specifier, printing errno as an error constant (similar to strerrorname_np).
616 * The function _dl_find_object has been added. In-process unwinders
617 can use it to efficiently locate unwinding information for a code
620 * Support for OpenRISC running on Linux has been added. This port requires
621 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
626 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
627 64-bit file offsets (LFS default).
629 * A new configure option, --with-rtld-early-cflags, can be used to
630 specify additional compiler flags for building the early startup code
631 of the dynamic linker. On targets which have CPU compatibility
632 checks, this can help to ensure that proper diagnostics are printed if
633 the dynamic loader runs on an incompatible CPU.
635 * On Linux, the epoll_pwait2 function has been added. It is similar to
636 epoll_wait with the difference the timeout has nanoseconds resolution.
638 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
639 enabling posix_spawn and posix_spawnp to set the controlling terminal in
640 the new process in a race free manner. This function is a GNU extension.
642 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
643 applications compiling with glibc and gcc 12 and later. Level 3 leverages
644 the __builtin_dynamic_object_size function to deliver additional
645 fortification balanced against additional runtime cost (checking non-constant
648 * The audit libraries will avoid unnecessary slowdown if it is not required
649 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
651 Deprecated and removed features, and other changes affecting compatibility:
653 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
654 has been removed since the first PT_LOAD segment is no longer executable
655 due to defaulting to -z separate-code.
657 * The r_version update in the debugger interface makes the glibc binary
658 incompatible with GDB binaries built without the following commits:
660 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
661 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
663 when audit modules or dlmopen are used.
665 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
667 * The --enable-static-pie option is no longer available. The glibc build
668 configuration script now automatically detects static-pie support in the
669 toolchain and architecture and enables it if available.
671 * The catchsegv script and associated libSegFault.so shared object have
672 been removed. There are widely-deployed out-of-process alternatives for
673 catching coredumps and backtraces.
675 * Support for prelink will be removed in the next release; this includes
676 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
677 variables and their functionality in the dynamic loader.
679 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
680 functionality to obtain the program mapping address can be achieved by
681 using LD_TRACE_LOADED_OBJECTS to value of 2.
683 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
684 support prelink PIE binaries.
686 Changes to build and runtime requirements:
688 * The audit module interface version LAV_CURRENT is increased to enable
689 proper bind-now support. The loader now advertises via the la_symbind
690 flags that PLT trace is not possible. New audit modules require the
691 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
692 modules are still loaded for all targets except aarch64.
694 * The audit interface on aarch64 is extended to support both the indirect
695 result location register (x8) and NEON Q register. Old audit modules are
696 rejected by the loader. Audit modules must be rebuilt to use the newer
697 structure sizes and the latest module interface version for LAV_CURRENT.
699 Security related changes:
701 CVE-2022-23219: Passing an overlong file name to the clnt_create
702 legacy function could result in a stack-based buffer overflow when
703 using the "unix" protocol. Reported by Martin Sebor.
705 CVE-2022-23218: Passing an overlong file name to the svcunix_create
706 legacy function could result in a stack-based buffer overflow.
708 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
709 function could result in a memory leak and potential access of
710 uninitialized memory. Reported by Qualys.
712 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
713 function may result in an off-by-one buffer underflow and overflow
714 when the current working directory is longer than PATH_MAX and also
715 corresponds to the / directory through an unprivileged mount
716 namespace. Reported by Qualys.
718 The following bugs are resolved with this release:
720 [12889] nptl: Race condition in pthread_kill
721 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
722 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
723 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
725 [15333] libc: Use 64-bit stat functions in installed programs
726 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
728 [15971] dynamic-link: No interface for debugger access to libraries
730 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
731 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
732 deeply nested DSO dependencies.
733 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
734 ID whose lifetime has not ended
735 [22542] network: buffer overflow in sunrpc clnt_create
737 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
739 [25947] malloc: memory leak in muntrace
740 [26045] math: fmaxf(inf, nan) does not always work
741 [26108] math: exp10() has problems with <tgmath.h>
742 [26779] build: benign use after realloc at localealias.c:329
743 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
744 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
745 [27945] build: build-many-glibcs.py doesn't configure GCC with
746 --enable-initfini-array
747 [27991] build: x86: sysdeps/x86/configure.ac breaks when
748 libc_cv_include_x86_isa_level is loaded from cache
749 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
750 in __REDIRECT_NTH macro
751 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
752 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
754 [28126] libc: nftw aborts for paths longer than PATH_MAX
755 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
756 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
758 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
759 [28185] math: Inaccurate j0f function (again)
760 [28199] locale: iconvconfig prefix flag behaves differently in glibc
762 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
763 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
765 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
766 [28223] libc: mips: clone does not align stack
767 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
769 [28256] malloc: Conditional jump or move depends on uninitialised
770 value(s) in __GI___tunables_init
771 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
772 spawn5 fail if stray fds are open
773 [28310] libc: Do not use affinity mask for sysconf
774 (_SC_NPROCESSORS_CONF)
775 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
777 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
779 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
780 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
782 [28353] network: Race condition on __opensock
783 [28357] dynamic-link: deadlock between pthread_create and ctors
784 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
785 [28361] nptl: Fix for bug 12889 causes setxid deadlock
786 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
787 [28390] localedata: Update locale data to Unicode 14.0.0
788 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
790 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
792 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
793 to tgkill (getpid (), gettid())
794 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
795 [28457] dynamic-link: Missing reldepmod4.so dependency for
797 [28469] time: linux: struct timex is not correctly set for 32-bit
798 systems with TIMESIZE=64
799 [28470] regex: Buffer read overrun in regular expression searching
800 [28475] string: Incorrect access attribute on memfrob
801 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
802 spurious NUL character on state reset
803 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
805 [28550] dynamic-link: FAIL: tst-dso-
806 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
808 [28554] build: Undefined generate-md5
809 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
811 [28607] nptl: Masked signals are delivered on thread exit
812 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
813 lack of cpu counting /proc fallback with glibc 2.34
814 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
815 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
816 [28648] dynamic-link: Running ld.so on statically linked binaries
818 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
820 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
821 [28678] nptl: nptl/tst-create1 hangs sporadically
822 [28688] dynamic-link: PT_LOAD p_align check is too strict
823 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
825 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
826 timezones generated by tzcode-2021d and later
827 [28713] math: GCC 12 miscompiles libm
828 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
829 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
830 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
831 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
832 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
833 Assertion `GL(dl_rtld_map).l_libname' failed!
834 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
835 [28757] nptl: GDB printer tests failed with new GDB
836 [28765] math: x86_64 libmvec atan2 accuracy
837 [28766] manual: Document libmvec accuracy
838 [28768] network: Buffer overflow in svcunix_create with long pathnames
840 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
842 [28770] libc: Unexpected return value from realpath() for too long
843 results (CVE-2021-3998)
844 [28771] libc: %ebx optimization macros are incompatible with .altmacro
846 [28780] build: --disable-default-pie doesn't work on static programs
847 [28782] libc: x86-64 ISA level for glibc itself is always
849 [28792] glob: possible wrong behaviour with patterns with double [
851 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
852 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
853 empty mon_decimal_point_wc
860 * In order to support smoother in-place-upgrades and to simplify
861 the implementation of the runtime all functionality formerly
862 implemented in the libraries libpthread, libdl, libutil, libanl has
863 been integrated into libc. New applications do not need to link with
864 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
865 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
866 provided, so that the linker options keep working. Applications which
867 have been linked against glibc 2.33 or earlier continue to load the
868 corresponding shared objects (which are now empty). The integration
869 of those libraries into libc means that additional symbols become
870 available by default. This can cause applications that contain weak
871 references to take unexpected code paths that would only have been
872 used in previous glibc versions when e.g. preloading libpthread.so.0,
873 potentially exposing application bugs.
875 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
876 PTHREAD_STACK_MIN is no longer constant and is redefined to
877 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
878 sets for modern architectural features like Arm SVE.
880 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
881 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
882 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
883 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
884 dynamic sized register sets for modern architectural features like
887 * The dynamic linker implements the --list-diagnostics option, printing
888 a dump of information related to IFUNC resolver operation and
889 glibc-hwcaps subdirectory selection.
891 * On Linux, the function execveat has been added. It operates similar to
892 execve and it is is already used to implement fexecve without requiring
893 /proc to be mounted. However, different than fexecve, if the syscall is not
894 supported by the kernel an error is returned instead of trying a fallback.
896 * The ISO C2X function timespec_getres has been added.
898 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
899 C2X, is supported to enable declarations of functions defined in Annex F
900 of C2X. Those declarations are also enabled when
901 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
902 defined, and when _GNU_SOURCE is defined.
904 * On powerpc64*, glibc can now be compiled without scv support using the
905 --disable-scv configure option.
907 * Add support for 64-bit time_t on configurations like x86 where time_t
908 is traditionally 32-bit. Although time_t still defaults to 32-bit on
909 these configurations, this default may change in future versions.
910 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
911 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
912 only enabled for Linux and the full support requires a minimum kernel
915 * The main gconv-modules file in glibc now contains only a small set of
916 essential converter modules and the rest have been moved into a supplementary
917 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
918 in the same GCONV_PATH. Similarly, external converter modules directories
919 may have supplementary configuration files in a gconv-modules.d directory
920 with names ending with .conf to logically classify the converter modules in
923 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
924 to configure the size of the thread stack cache.
926 * The function _Fork has been added as an async-signal-safe fork replacement
927 since Austin Group issue 62 dropped the async-signal-safe requirement for
928 fork (and it will be included in the future POSIX standard). The new _Fork
929 function does not run any atfork function neither resets any internal state
930 or lock (such as the malloc one), and only sets up a minimal state required
931 to call async-signal-safe functions (such as raise or execve). This function
932 is currently a GNU extension.
934 * On Linux, the close_range function has been added. It allows efficiently
935 closing a range of file descriptors on recent kernels (version 5.9).
937 * The function closefrom has been added. It closes all file descriptors
938 greater than or equal to a given integer. This function is a GNU extension,
939 although it is also present in other systems.
941 * The posix_spawn_file_actions_addclosefrom_np function has been added,
942 enabling posix_spawn and posix_spawnp to close all file descriptors greater
943 than or equal to a given integer. This function is a GNU extension,
944 although Solaris also provides a similar function.
946 * When invoked explicitly, the dynamic linker now uses the kernel to
947 execute programs that do not have any dynamic dependency (that is,
948 they are statically linked). This feature is Linux-specific.
950 Deprecated and removed features, and other changes affecting compatibility:
952 * The function pthread_mutex_consistent_np has been deprecated; programs
953 should use the equivalent standard function pthread_mutex_consistent
956 * The function pthread_mutexattr_getrobust_np has been deprecated;
957 programs should use the equivalent standard function
958 pthread_mutexattr_getrobust instead.
960 * The function pthread_mutexattr_setrobust_np has been deprecated;
961 programs should use the equivalent standard function
962 pthread_mutexattr_setrobust instead.
964 * The function pthread_yield has been deprecated; programs should use
965 the equivalent standard function sched_yield instead.
967 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
969 * Various rarely-used functions declared in <resolv.h> and
970 <arpa/nameser.h> have been deprecated. Applications are encouraged to
971 use dedicated DNS processing libraries if applicable. For <resolv.h>,
972 this affects the functions dn_count_labels, fp_nquery, fp_query,
973 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
974 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
975 p_type, putlong, putshort, res_hostalias, res_isourserver,
976 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
977 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
978 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
979 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
981 * Various symbols previously defined in libresolv have been moved to libc
982 in order to prepare for libresolv moving entirely into libc (see earlier
983 entry for merging libraries into libc). The symbols __dn_comp,
984 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
985 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
986 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
987 __res_search, __res_send formerly in libresolv have been renamed and no
988 longer have a __ prefix. They are now available in libc.
990 * The pthread cancellation handler is now installed with SA_RESTART and
991 pthread_cancel will always send the internal SIGCANCEL on a cancellation
992 request. It should not be visible to applications since the cancellation
993 handler should either act upon cancellation (if asynchronous cancellation
994 is enabled) or ignore the cancellation internal signal. However there are
995 buggy kernel interfaces (for instance some CIFS versions) that could still
996 see a spurious EINTR error when cancellation interrupts a blocking syscall.
998 * Previously, glibc installed its various shared objects under versioned
999 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
1000 were provided as symbolic links. Starting with glibc 2.34, the shared
1001 objects are installed under their ABI sonames directly, without
1002 symbolic links. This increases compatibility with distribution
1003 package managers that delete removed files late during the package
1004 upgrade or downgrade process.
1006 * The symbols mallwatch and tr_break are now deprecated and no longer used in
1007 mtrace. Similar functionality can be achieved by using conditional
1008 breakpoints within mtrace functions from within gdb.
1010 * The __morecore and __after_morecore_hook malloc hooks and the default
1011 implementation __default_morecore have been removed from the API. Existing
1012 applications will continue to link against these symbols but the interfaces
1013 no longer have any effect on malloc.
1015 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
1016 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
1017 disabled by default in the main C library. Users looking to use these
1018 features now need to preload a new debugging DSO libc_malloc_debug.so to get
1019 this functionality back.
1021 * The deprecated functions malloc_get_state and malloc_set_state have been
1022 moved from the core C library into libc_malloc_debug.so. Legacy applications
1023 that still use these functions will now need to preload libc_malloc_debug.so
1024 in their environment using the LD_PRELOAD environment variable.
1026 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
1027 __memalign_hook and __free_hook are now removed from the API. Compatibility
1028 symbols are present to support legacy programs but new applications can no
1029 longer link to these symbols. These hooks no longer have any effect on glibc
1030 functionality. The malloc debugging DSO libc_malloc_debug.so currently
1031 supports hooks and can be preloaded to get this functionality back for older
1032 programs. However this is a transitional measure and may be removed in a
1033 future release of the GNU C Library. Users may port away from these hooks by
1034 writing and preloading their own malloc interposition library.
1036 Changes to build and runtime requirements:
1038 * On Linux, the shm_open, sem_open, and related functions now expect the
1039 file shared memory file system to be mounted at /dev/shm. These functions
1040 no longer search among the system's mount points for a suitable
1041 replacement if /dev/shm is not available.
1043 Security related changes:
1045 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1046 a request for netgroup lookup, may crash due to a double-free,
1047 potentially resulting in degraded service or Denial of Service on the
1048 local system. Reported by Chris Schanzle.
1050 CVE-2021-33574: The mq_notify function has a potential use-after-free
1051 issue when using a notification type of SIGEV_THREAD and a thread
1052 attribute with a non-default affinity mask.
1054 CVE-2021-35942: The wordexp function may overflow the positional
1055 parameter number when processing the expansion resulting in a crash.
1056 Reported by Philippe Antoine.
1058 The following bugs are resolved with this release:
1060 [4737] libc: fork is not async-signal-safe
1061 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1062 [10353] libc: Methods for deleting all file descriptors greater than
1063 given integer (closefrom)
1064 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1065 name containing multi-byte character(s)
1066 [14469] math: Inaccurate j0f function
1067 [14470] math: Inaccurate j1f function
1068 [14471] math: Inaccurate y0f function
1069 [14472] math: Inaccurate y1f function
1070 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1072 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1073 crashes if it fails dlsym() twice
1074 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1075 [16063] nptl: Provide a pthread_once variant in libc directly
1076 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1077 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1078 [17183] manual: description of ENTRY struct in <search.h> in glibc
1080 [18435] nptl: pthread_once hangs when init routine throws an exception
1081 [18524] nptl: Missing calloc error checking in
1082 __cxa_thread_atexit_impl
1083 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1084 pthread_create and dlopen
1085 [19366] nptl: returning from a thread should disable cancellation
1086 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1087 when non-root user changes priority
1088 [20802] dynamic-link: getauxval NULL pointer dereference after static
1090 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1091 [22057] malloc: malloc_usable_size is broken with mcheck
1092 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1094 [23323] libc: [RFE] CSU startup hardening.
1095 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1097 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1098 $PLATFORM, $ORIGIN) crashes
1099 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1100 [23554] nptl: pthread_getattr_np reports wrong stack size with
1102 [24106] libc: Bash interpreter in ldd script is taken from host
1103 [24773] dynamic-link: dlerror in an secondary namespace does not use
1104 the right free implementation
1105 [25036] localedata: Update collation order for Swedish
1106 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1107 shm_open to pick wrong directory
1108 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1109 crash in IFUNC resolver due to stack canary (--enable-stack-
1111 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1112 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1113 [27111] dynamic-link: pthread_create and tls access use link_map
1114 objects that may be concurrently freed by dlclose
1115 [27132] malloc: memusagestat is linked to system librt, leading to
1116 undefined symbols on major version upgrade
1117 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1119 [27249] libc: libSegFault.so does not output signal number properly
1120 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1122 [27318] dynamic-link: glibc fails to load binaries when built with
1123 -march=sandybridge: CPU ISA level is lower than required
1124 [27343] nss: initgroups() SIGSEGVs when called on a system without
1125 nsswich.conf (in a chroot)
1126 [27346] dynamic-link: x86: PTWRITE feature check is missing
1127 [27389] network: NSS chroot hardening causes regressions in chroot
1129 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1130 [27444] libc: sysconf reports unsupported option (-1) for
1131 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1132 [27462] nscd: double-free in nscd (CVE-2021-27645)
1133 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1134 malloc/tst-malloc-thread-fail
1135 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1136 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1138 [27522] glob: glob, glob64 incorrectly marked as __THROW
1139 [27555] dynamic-link: Static tests fail with --enable-stack-
1141 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1142 information for the current directory
1143 [27577] dynamic-link: elf/ld.so --help doesn't work
1144 [27605] libc: tunables can't control xsave/xsavec selection in
1145 dl_runtime_resolve_*
1146 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1147 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1149 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1150 _nss_files_getcanonname_r) from within a dlmopen namespace.
1151 [27648] libc: FAIL: misc/tst-select
1152 [27650] stdio: vfscanf returns too early if a match is longer than
1154 [27651] libc: Performance regression after updating to 2.33
1155 [27655] string: Wrong size calculation in string/test-strnlen.c
1156 [27706] libc: select fails to update timeout on error
1157 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1158 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1159 tries resolving them lazily
1160 [27744] nptl: Support different libpthread/ld.so load orders in
1162 [27749] libc: Data race __run_exit_handlers
1163 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1165 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1166 exceeds maximum object size 2147483647
1167 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1169 [27872] build: Obsolete configure option --enable-stackguard-
1171 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1172 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1173 [27892] libc: powerpc: scv ABI error handling fails to check
1175 [27896] nptl: mq_notify does not handle separately allocated thread
1176 attributes (CVE-2021-33574)
1177 [27901] libc: TEST_STACK_ALIGN doesn't work
1178 [27902] libc: The x86-64 clone wrapper fails to align child stack
1179 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1180 [27939] libc: aarch64: clone does not align the stack
1181 [27968] libc: s390x: clone does not align the stack
1182 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1183 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1184 with n >= 0x80000000
1185 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1186 thread never allocated anything
1187 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1188 [28064] string: x86_64:wcslen implementation list has wcsnlen
1189 [28067] libc: FAIL: posix/tst-spawn5
1190 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1191 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1193 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1194 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1195 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1197 [28091] network: ns_name_skip may return 0 for domain names without
1205 * The dynamic linker accepts the --list-tunables argument which prints
1206 all the supported tunables. This option is disable if glibc is
1207 configured with tunables disabled (--enable-tunables=no).
1209 * The dynamic linker accepts the --argv0 argument and provides opportunity
1210 to change argv[0] string.
1212 * The dynamic linker loads optimized implementations of shared objects
1213 from subdirectories under the glibc-hwcaps directory on the library
1214 search path if the system's capabilities meet the requirements for
1215 that subdirectory. Initially supported subdirectories include
1216 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1217 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1218 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1219 subdirectory names correspond to the vendor-independent x86-64
1220 microarchitecture levels defined in the x86-64 psABI supplement.
1222 * The new --help option of the dynamic linker provides usage and
1223 information and library search path diagnostics.
1225 * The mallinfo2 function is added to report statistics as per mallinfo,
1226 but with larger field widths to accurately report values that are
1227 larger than fit in an integer.
1229 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1231 * Support for the RISC-V ISA running on Linux has been expanded to run on
1232 32-bit hardware. This is supported for the following ISA and ABI pairs:
1238 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1241 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1242 glibc may use additional checks that may have an additional performance
1243 overhead. At present these checks are available only on LLVM 9 and later.
1244 The latest GCC available at this time (10.2) does not support this level of
1247 Deprecated and removed features, and other changes affecting compatibility:
1249 * The mallinfo function is marked deprecated. Callers should call
1252 * When dlopen is used in statically linked programs, alternative library
1253 implementations from HWCAP subdirectories are no longer loaded.
1254 Instead, the default implementation is used.
1256 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1257 removed. To support old binaries, the vtimes function continues to exist
1258 as a compatibility symbol. Applications should use the getrlimit or
1261 * Following a change in the tzdata 2018a release upstream, the zdump
1262 program is now installed in the /usr/bin subdirectory. Previously,
1263 the /usr/sbin subdirectory was used.
1265 * On s390(x), the type float_t is now derived from the macro
1266 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1267 hardcoded to double. This does not affect the ABI of any libraries
1268 that are part of the GNU C Library, but may affect the ABI of other
1269 libraries that use this type in their interfaces. The new definition
1270 improves consistency with compiler behavior in many scenarios.
1272 * A future version of glibc will stop loading shared objects from the
1273 "tls" subdirectories on the library search path, the subdirectory that
1274 corresponds to the AT_PLATFORM system name, and also stop employing
1275 the legacy AT_HWCAP search mechanism. Applications should switch to
1276 the new glibc-hwcaps mechanism instead; if they do not do that, only
1277 the baseline version (directly from the search path directory) will be
1280 Changes to build and runtime requirements:
1282 * On Linux, the system administrator needs to configure /dev/pts with
1283 the intended access modes for pseudo-terminals. glibc no longer
1284 attempts to adjust permissions of terminal devices. The previous glibc
1285 defaults ("tty" group, user read/write and group write) already
1286 corresponded to what most systems used, so that grantpt did not
1287 perform any adjustments.
1289 * On Linux, the posix_openpt and getpt functions no longer attempt to
1290 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1291 (and pseudo-terminals are supported), a devpts file system is mounted
1292 on /dev/pts. Current systems already meet these requirements.
1294 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1296 Security related changes:
1298 CVE-2021-3326: An assertion failure during conversion from the
1299 ISO-20220-JP-3 character set using the iconv function has been fixed.
1300 This assertion was triggered by certain valid inputs in which the
1301 converted output contains a combined sequence of two wide characters
1302 crossing a buffer boundary. Reported by Tavis Ormandy.
1304 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1305 invoked with input containing redundant shift sequences in the IBM1364,
1306 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1308 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1309 when invoked with UCS4 input containing an invalid character.
1311 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1312 invoked with EUC-KR input containing invalid multibyte input sequences.
1314 The following bugs are resolved with this release:
1316 [10635] libc: realpath portability patches
1317 [16124] dynamic-link: ld.so should allow to change argv[0]
1318 [17924] malloc: 'free' should not set errno
1319 [18683] libc: Linux faccessat implementation can incorrectly ignore
1321 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1322 [23091] hurd: missing waitid support
1323 [23249] libc: Epyc and other current AMD CPUs do not select the
1324 "haswell" platform subdirectory
1325 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1327 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1329 [24941] libc: Make grantpt usable after multi-threaded fork in more
1331 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1332 [24973] locale: iconv encounters segmentation fault when converting
1333 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1334 [25399] string: undefined reference to `__warn_memset_zero_len' when
1335 changing gnuc version
1336 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1338 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1340 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1341 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1342 [26100] libc: Race in syslog(3) with regards to tag printing.
1343 [26124] libc: Export <cpu-features.h>
1344 [26130] nscd: Inconsistent nscd cache during pruning
1345 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1346 [26224] locale: iconv hangs when converting some invalid inputs from
1347 several IBM character sets (CVE-2020-27618)
1348 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1349 too much stack space
1350 [26343] manual: invalid documented return type for strerrorname_np(),
1351 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1352 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1354 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1356 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1357 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1359 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1360 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1361 [26555] string: strerrorname_np does not return the documented value
1362 [26592] libc: pointer arithmetic overflows in realpath
1363 [26600] network: Transaction ID collisions cause slow DNS lookups in
1365 [26606] libc: [2.33 Regression] pselect is broken on x32
1366 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1367 [26620] glob: fnmatch with collating symbols results in segmentation
1369 [26625] libc: [2.33 Regression] CET is disabled
1370 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1371 at the end of a memory mapping
1372 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1373 by the caller to the kernel
1374 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1375 [26647] build: [-Werror=array-parameter=] due to different
1376 declarations for __sigsetjmp
1377 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1379 [26649] stdio: printf should handle non-normal x86 long double numbers
1380 gracefully (CVE-2020-29573)
1381 [26686] build: -Warray-parameter instances building with GCC 11
1382 [26687] build: -Warray-bounds instances building with GCC 11
1383 [26690] stdio: Aliasing violation in __vfscanf_internal
1384 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1385 [26726] build: GCC warning calling new_composite_name with an array of
1387 [26736] libc: FAIL: misc/tst-sysvshm-linux
1388 [26737] libc: Random FAIL: rt/tst-shm
1389 [26791] libc: Missing O_CLOEXEC in sysconf.c
1390 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1392 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1394 [26818] string: aarch64: string tests may run ifunc variants that are
1396 [26821] libc: Memory leak test failures on Fedora 33
1397 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1398 FSGSBASE/LM/RDRAND check failure
1399 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1401 [26853] libc: aarch64: Missing unwind information in statically linked
1403 [26923] locale: Assertion failure in iconv when converting invalid
1404 UCS4 (CVE-2020-29562)
1405 [26926] dynamic-link: aarch64: library dependencies are not bti
1407 [26932] libc: sh: Multiple floating point functions defined as stubs
1409 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1411 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1413 [27002] build: libc_freeres_fn build failure with GCC 11
1414 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1415 [27008] dynamic-link: ld.so.cache should have endianness markup
1416 [27042] libc: [alpha] anonymous union in struct stat confuses
1418 [27053] libc: Conformance regression in system(3) (and probably also
1420 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1422 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1423 [27083] libc: Unsafe unbounded alloca in addmntent
1424 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1426 [27130] string: "rep movsb" performance issue
1427 [27150] libc: alpha: wait4() is unavailable in static linking
1428 [27177] dynamic-link:
1429 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1431 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1432 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1433 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1434 related to combining characters (CVE-2021-3326)
1441 * Unicode 13.0.0 Support: Character encoding, character type info, and
1442 transliteration tables are all updated to Unicode 13.0.0, using
1443 generator scripts contributed by Mike FABIAN (Red Hat).
1445 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1447 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1448 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1449 Three ABIs are supported:
1455 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1456 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1458 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1459 DT_DEPAUDIT dynamic section entries of the main executable.
1461 * powerpc64le supports IEEE128 long double libm/libc redirects when
1462 using -mabi=ieeelongdouble to compile C code on supported GCC
1463 toolchains. It is recommended to use GCC 8 or newer when testing
1466 * To help detect buffer overflows and other out-of-bounds accesses
1467 several APIs have been annotated with GCC 'access' attribute. This
1468 should help GCC 10 issue better warnings.
1470 * On Linux, functions pthread_attr_setsigmask_np and
1471 pthread_attr_getsigmask_np have been added. They allow applications
1472 to specify the signal mask of a thread created with pthread_create.
1474 * The GNU C Library now provides the header file <sys/single_threaded.h>
1475 which declares the variable __libc_single_threaded. Applications are
1476 encouraged to use this variable for single-thread optimizations,
1477 instead of weak references to symbols historically defined in
1480 * The functions sigabbrev_np and sigdescr_np have been added. The
1481 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1482 SIGHUP) while sigdescr_np returns a string describing the signal number
1483 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1484 attempt to translate the return description, both functions return
1485 NULL for an invalid signal number.
1487 They should be used instead of sys_siglist or sys_sigabbrev and they
1488 are both thread and async-signal safe. These functions are GNU extensions.
1490 * The functions strerrorname_np and strerrordesc_np have been added. The
1491 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1492 while strerrordesc_np returns a string describing the error number
1493 (e.g "Invalid argument" for EINVAL). Different than strerror,
1494 strerrordesc_np does not attempt to translate the return description, both
1495 functions return NULL for an invalid error number.
1497 They should be used instead of sys_errlist and sys_nerr, both are
1498 thread and async-signal safe. These functions are GNU extensions.
1500 * AArch64 now supports standard branch protection security hardening
1501 in glibc when it is built with a GCC that is configured with
1502 --enable-standard-branch-protection (or if -mbranch-protection=standard
1503 flag is passed when building both GCC target libraries and glibc,
1504 in either case a custom GCC is needed). This includes branch target
1505 identification (BTI) and pointer authentication for return addresses
1506 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1507 extensions respectively for the protection to be effective,
1508 otherwise the used instructions are nops. User code can use PAC-RET
1509 without libc support, but BTI requires a libc that is built with BTI
1510 support, otherwise runtime objects linked into user code will not be
1513 Deprecated and removed features, and other changes affecting compatibility:
1515 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1516 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1517 RPC header files. Backward compatibility for old programs is kept
1518 only for architectures and ABIs that have been added in or before
1519 glibc 2.31. New programs need to use TI-RPC
1520 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1521 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1523 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1524 as shared library for backward compatibility and the NSS modules "nis"
1525 and "nisplus" are not built at all and libnsl's headers aren't
1526 installed. This compatibility is kept only for architectures and ABIs
1527 that have been added in or before version 2.28. Replacement
1528 implementations based on TI-RPC, which additionally support IPv6, are
1529 available from <https://github.com/thkukuk/>. This change does not
1530 affect the "compat" NSS module, which does not depend on libnsl
1531 since 2.27 and thus can be used without NIS.
1533 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1534 removed. To support old binaries, the sysctl function continues to
1535 exist as a compatibility symbol (on those architectures which had it),
1536 but always fails with ENOSYS. This reflects the removal of the system
1537 call from all architectures, starting with Linux 5.5.
1539 * The sstk function is no longer available to newly linked binaries.
1540 Its implementation always returned with a failure, and the function
1541 was not declared in any header file.
1543 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1544 sigrelse, sigignore and sigset, and the sigmask macro have been
1545 deprecated. Applications should use the sigsuspend, sigprocmask and
1546 sigaction functions instead.
1548 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1549 already supported this format for almost 20 years.
1551 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1552 are no longer available to newly linked binaries, and their declarations
1553 have been removed from <string.h>. They are exported solely as
1554 compatibility symbols to support old binaries. All programs should use
1557 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1558 are no longer available to newly linked binaries, and their declarations
1559 have been removed from <stdio.h>. They are exported solely as
1560 compatibility symbols to support old binaries. All programs should use
1561 strerror or strerror_r instead.
1563 * Both strerror and strerror_l now share the same internal buffer in the
1564 calling thread, meaning that the returned string pointer may be invalided
1565 or contents might be overwritten on subsequent calls in the same thread or
1566 if the thread is terminated. It makes strerror MT-safe.
1568 * Using weak references to libpthread functions such as pthread_create
1569 or pthread_key_create to detect the singled-threaded nature of a
1570 program is an obsolescent feature. Future versions of glibc will
1571 define pthread_create within libc.so.6 itself, so such checks will
1572 always flag the program as multi-threaded. Applications should check
1573 the __libc_single_threaded variable declared in
1574 <sys/single_threaded.h> instead.
1576 * The "files" NSS module no longer supports the "key" database (used for
1577 secure RPC). The contents of the /etc/publickey file will be ignored,
1578 regardless of the settings in /etc/nsswitch.conf. (This method of
1579 storing RPC keys only supported the obsolete and insecure AUTH_DES
1580 flavor of secure RPC.)
1582 * The __morecore and __after_morecore_hook malloc hooks and the default
1583 implementation __default_morecore have been deprecated. Applications
1584 should use malloc interposition to change malloc behavior, and mmap to
1585 allocate anonymous memory. A future version of glibc may require that
1586 applications which use the malloc hooks must preload a special shared
1587 object, to enable the hooks.
1589 * The hesiod NSS module has been deprecated and will be removed in a
1590 future version of glibc. System administrators are encouraged to
1591 switch to other approaches for networked account databases, such as
1594 Changes to build and runtime requirements:
1596 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1597 long double redirects.
1599 Security related changes:
1601 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1602 invoked with the -c option and when processing invalid multi-byte input
1603 sequences. Reported by Jan Engelhardt.
1605 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1606 corruption when they were passed a pseudo-zero argument. Reported by Guido
1607 Vranken / ForAllSecure Mayhem.
1609 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1610 expanding ~user has been fixed.
1612 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1613 memmove functions has been fixed. Discovered by Jason Royes and Samual
1614 Dytrych of the Cisco Security Assessment and Penetration Team (See
1617 The following bugs are resolved with this release:
1619 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1620 [10441] manual: Backtraces code example lacks error checking
1621 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1622 timer_sigev_thread dangerous
1623 [14231] stdio: stdio-common tests memory requirements
1624 [14578] libc: /proc-based emulation for lchmod, fchmodat
1625 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1626 filtee has constructor
1627 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1628 sequences (CVE-2016-10228)
1629 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1630 character entities for infinity & pi
1631 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1632 segfaults in applications
1633 [20543] libc: Please move from .gnu.linkonce to comdat
1634 [22489] network: gcc warns about implicit conversion in
1635 ICMP6_FILTER_SETPASS with -Wsign-conversion
1636 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1637 [23294] math: Complex _FloatN functions are redirected to the wrong
1638 function with -mlong-double-64
1639 [23296] libc: Data race in setting function descriptor during lazy
1641 [23668] dynamic-link: ldconfig: Default to the new format for
1643 [23819] hurd: hurd: Add C11 thread support
1644 [23990] build: test-container error out on failure to exec child.
1645 [23991] build: shell-container typo in run_command_array
1646 [24638] manual: Error in example of parsing a template string
1647 [24654] manual: Wrong declaration of wcschr in libc manual
1648 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1650 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1651 dynamically loaded dsos
1652 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1653 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1655 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1656 restore EAX, ECX and EDX
1657 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1658 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1659 [25420] network: Race condition in resolv_conf.c can result in caching
1660 stale configuration forever
1661 [25487] math: sinl() stack corruption from crafted input
1663 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1665 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1666 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1668 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1669 on 32 bit and old kernel
1670 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1671 [25639] localedata: Some names of days and months wrongly spelt in
1673 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1674 amount of sigset_t bytes
1675 [25691] stdio: printf: memory leak when printing long multibyte
1677 [25715] libc: system() returns wrong errors when posix_spawn fails
1678 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1679 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1680 state for conversions that produce two Unicode code points
1681 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1682 for linux x86_64 leads to livelock
1683 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1684 test failures, invalid instruction in ld.so
1685 [25790] glob: Typo in tst-fnmatch.input
1686 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1688 [25819] localedata: Update locale data to Unicode 13.0.0
1689 [25824] libc: Abnormal function of strnlen in aarch64
1690 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1691 [25896] libc: Incorrect prctl
1692 [25902] libc: Bad LOADARGS_N
1693 [25905] dynamic-link: VSX registers are corrupted during PLT
1694 resolution when glibc is built with --disable-multi-arch and --with-
1696 [25933] string: Off by one error in __strncmp_avx2 when
1697 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1699 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1700 exiting detached thread
1701 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1703 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1705 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1706 [26073] math: getpayload() has wrong return value
1707 [26076] dynamic-link: dlmopen crashes after failing to load
1708 dependencies in audit mode
1709 [26120] localedata: column width of of some Korean
1710 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1711 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1712 [26133] libc: Incorrect need_arch_feature_F16C
1713 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1715 [26149] libc: PKU is usable only if OSPKE is set
1716 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1718 [26208] libc: Incorrect bit_cpu_CLFSH
1719 [26210] network: Incorrect use of hidden symbols for global sunrpc
1721 [26211] stdio: printf integer overflow calculating allocation size
1722 [26214] stdio: printf_fp double free
1723 [26215] stdio: printf_fp memory leak
1724 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1725 [26258] nss: nss_compat should not read input files with mmap
1726 [26332] string: Incorrect cache line size load causes memory
1727 corruption in memset
1734 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1735 enable features from the draft ISO C2X standard. Only some features from
1736 this draft standard are supported by the GNU C Library, and as the draft
1737 is under active development, the set of features enabled by this macro is
1738 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1739 by compiling with "gcc -std=gnu2x".
1741 * The <math.h> functions that round their results to a narrower type now
1742 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1743 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1744 Clarification Request 13 to TS 18661-3.
1746 * The function pthread_clockjoin_np has been added, enabling join with a
1747 terminated thread with a specific clock. It allows waiting against
1748 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1750 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1752 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1753 in queries if the trust-ad option is set via the options directive in
1754 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1755 mode, the AD bit, as provided by the name server, is available to
1756 applications which call res_search and related functions. In the default
1757 mode, the AD bit is not set in queries, and it is automatically cleared in
1758 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1759 servers and the network path to them are treated as untrusted.)
1761 Deprecated and removed features, and other changes affecting compatibility:
1763 * The totalorder and totalordermag functions, and the corresponding
1764 functions for other floating-point types, now take pointer arguments to
1765 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1766 passing. This is in accordance with the resolution of Clarification
1767 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1768 floating-point arguments directly will continue to work.
1770 * The obsolete function stime is no longer available to newly linked
1771 binaries, and its declaration has been removed from <time.h>.
1772 Programs that set the system time should use clock_settime instead.
1774 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1775 in a future version of glibc. In this release, the header still exists
1776 but calling ftime will cause a compiler warning. All programs should use
1777 gettimeofday or clock_gettime instead.
1779 * The gettimeofday function no longer reports information about a
1780 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1781 many years, as it cannot handle the full complexity of the world's
1782 timezones, but hitherto we have supported it on a best-effort basis.
1783 Changes required to support 64-bit time_t on 32-bit architectures have
1784 made this no longer practical.
1786 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1787 should expect to receive a 'struct timezone' whose tz_minuteswest and
1788 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1789 happen on a few Linux-based ports. This will be corrected in a future
1792 All callers should supply a null pointer for the 'tzp' argument to
1793 gettimeofday. For accurate information about the time zone associated
1794 with the current time, use the localtime function.
1796 gettimeofday itself is obsolescent according to POSIX. We have no plans
1797 to remove access to this function, but portable programs should consider
1798 using clock_gettime instead.
1800 * The settimeofday function can still be used to set a system-wide time
1801 zone when the operating system supports it. This is because the Linux
1802 kernel reused the API, on some architectures, to describe a system-wide
1803 time-zone-like offset between the software clock maintained by the kernel,
1804 and the "RTC" clock that keeps time when the system is shut down.
1806 However, to reduce the odds of this offset being set by accident,
1807 settimeofday can no longer be used to set the time and the offset
1808 simultaneously. If both of its two arguments are non-null, the call
1809 will fail (setting errno to EINVAL).
1811 Callers attempting to set this offset should also be prepared for the call
1812 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1813 some Linux architectures. The Linux kernel maintainers are discussing a
1814 more principled replacement for the reused API. After a replacement
1815 becomes available, we will change settimeofday to fail with ENOSYS on all
1816 platforms when its 'tzp' argument is not a null pointer.
1818 settimeofday itself is obsolescent according to POSIX. Programs that set
1819 the system time should use clock_settime and/or the adjtime family of
1820 functions instead. We may cease to make settimeofday available to newly
1821 linked binaries after there is a replacement for Linux's time-zone-like
1824 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1825 the optional CAS instruction is implemented (for instance, LEON processors
1826 are still supported, but SuperSPARC processors are not).
1828 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1831 * If a lazy binding failure happens during dlopen, during the execution of
1832 an ELF constructor, the process is now terminated. Previously, the
1833 dynamic loader would return NULL from dlopen, with the lazy binding error
1834 captured in a dlerror message. In general, this is unsafe because
1835 resetting the stack in an arbitrary function call is not possible.
1837 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1838 executable stack unless explicitly configured at build time to require
1839 minimum kernel version 4.8 or newer. This is because executing
1840 floating-point branches on a non-executable stack on Linux kernels prior to
1841 4.8 can lead to application crashes for some MIPS configurations. While
1842 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1843 expected to enable non-executable stack by default with PT_GNU_STACK by
1844 default and is thus likely to trigger a crash on older kernels.
1846 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1847 non-executable stack while dropping support for older kernels.
1849 * System call wrappers for time system calls now use the new time64 system
1850 calls when available. On 32-bit targets, these wrappers attempt to call
1851 the new system calls first and fall back to the older 32-bit time system
1852 calls if they are not present. This may cause issues in environments
1853 that cannot handle unsupported system calls gracefully by returning
1854 -ENOSYS. Seccomp sandboxes are affected by this issue.
1856 Changes to build and runtime requirements:
1858 * It is no longer necessary to have recent Linux kernel headers to build
1859 working (non-stub) system call wrappers on all architectures except 64-bit
1860 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1862 * The ChangeLog file is no longer present in the toplevel directory of the
1863 source tree. ChangeLog files are located in the ChangeLog.old directory as
1864 ChangeLog.N where the highest N has the latest entries.
1866 Security related changes:
1868 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1869 out-of-bounds write when executed in a signal frame context.
1871 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1872 environment variable during program execution after a security
1873 transition, allowing local attackers to restrict the possible mapping
1874 addresses for loaded libraries and thus bypass ASLR for a setuid
1875 program. Reported by Marcin Kościelnicki.
1877 The following bugs are resolved with this release:
1879 [12031] localedata: iconv -t ascii//translit with Greek characters
1880 [15813] libc: Multiple issues in __gen_tempname
1881 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1882 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1883 [19767] libc: vdso is not used with static linking
1884 [19903] hurd: Shared mappings not being inherited by children processes
1885 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1886 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1888 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1889 Symbols-A/B Unicode blocks
1890 [23518] libc: Eliminate __libc_utmp_jump_table
1891 [24026] malloc: malloc_info() returns wrong numbers
1892 [24054] localedata: Many locales are missing date_fmt
1893 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1894 [24304] dynamic-link: Lazy binding failure during ELF
1895 constructors/destructors is not fatal
1896 [24376] libc: RISC-V symbol size confusion with _start
1897 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1899 [24824] libc: test-in-container does not install charmap files compatible
1901 [24844] regex: regex bad pointer / leakage if malloc fails
1902 [24867] malloc: Unintended malloc_info formatting changes
1903 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1904 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1905 [24882] libc: login: pututline uses potentially outdated cache
1906 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1907 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1909 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1911 [24930] dynamic-link: dlopen of PIE executable can result in
1912 _dl_allocate_tls_init assertion failure
1913 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1914 (stringop-overflow error)
1915 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1916 functions other can lead to crashes
1917 [24967] libc: jemalloc static linking causes runtime failure
1918 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1920 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1921 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1922 [25097] libc: new -Warray-bounds with GCC 10
1923 [25112] dynamic-link: dlopen must not make new objects accessible when it
1924 still can fail with an error
1925 [25139] localedata: Please add the new mnw_MM locale
1926 [25149] regex: Array bounds violation in proceed_next_node
1927 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1928 initialized correctly
1929 [25189] libc: glibc's __glibc_has_include causes issues with clang
1931 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1932 value to an unsigned
1933 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1934 binaries (CVE-2019-19126)
1935 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1937 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1939 [25232] string: <string.h> does not enable const correctness for strchr et
1941 [25233] localedata: Consider "." as the thousands separator for sl_SI
1943 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1944 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1945 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1947 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1948 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1950 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1951 (dl_initfirst) link map pointer
1952 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1953 [25423] libc: Array overflow in backtrace on powerpc
1954 [25425] network: Missing call to __resolv_context_put in
1955 getaddrinfo.c:gethosts
1962 * Unicode 12.1.0 Support: Character encoding, character type info, and
1963 transliteration tables are all updated to Unicode 12.1.0, using
1964 generator scripts contributed by Mike FABIAN (Red Hat).
1966 * The dynamic linker accepts the --preload argument to preload shared
1967 objects, in addition to the LD_PRELOAD environment variable.
1969 * The twalk_r function has been added. It is similar to the existing
1970 twalk function, but it passes an additional caller-supplied argument
1971 to the callback function.
1973 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1975 * Minguo (Republic of China) calendar support has been added as an
1976 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1979 * The entry for the new Japanese era has been added for ja_JP locale.
1981 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1982 pvalloc, memalign, and posix_memalign fail now with total object size
1983 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1984 pointer subtraction within the allocated object, where results might
1985 overflow the ptrdiff_t type.
1987 * The dynamic linker no longer refuses to load objects which reference
1988 versioned symbols whose implementation has moved to a different soname
1989 since the object has been linked. The old error message, symbol
1990 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1991 link time reference, is gone.
1993 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1994 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1995 functions. These behave similarly to their "timed" equivalents, but also
1996 accept a clockid_t parameter to determine which clock their timeout should
1997 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1998 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1999 time of the wait (unlike with pthread_condattr_setclock, which requires
2000 the clock choice at initialization time).
2002 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
2003 work, new resolvers can use a second argument which can be extended in
2004 the future, currently it contains the AT_HWCAP2 value.
2006 Deprecated and removed features, and other changes affecting compatibility:
2008 * The copy_file_range function fails with ENOSYS if the kernel does not
2009 support the system call of the same name. Previously, user space
2010 emulation was performed, but its behavior did not match the kernel
2011 behavior, which was deemed too confusing. Applications which use the
2012 copy_file_range function can no longer rely on glibc to provide a fallback
2013 on kernels that do not support the copy_file_range system call, and if
2014 this function returns ENOSYS, they will need to use their own fallback.
2015 Support for copy_file_range for most architectures was added in version
2016 4.5 of the mainline Linux kernel.
2018 * The functions clock_gettime, clock_getres, clock_settime,
2019 clock_getcpuclockid, clock_nanosleep were removed from the librt library
2020 for new applications (on architectures which had them). Instead, the
2021 definitions in libc will be used automatically, which have been available
2024 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
2025 and <sys/stropts.h> have been removed.
2027 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
2028 resolver flag (deprecated in glibc 2.25) have been removed.
2030 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
2031 resolver have been removed from <resolv.h>.
2033 * With --enable-bind-now, installed programs are now linked with the
2036 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
2037 configurations) has been removed, following the deprecation of this
2038 subarchitecture in version 8 of GCC, and its removal in version 9.
2040 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2041 header have been removed.
2043 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2044 deprecated and will be removed from a future version of glibc.
2045 Application should directly access /proc instead. For obtaining random
2046 bits, the getentropy function can be used.
2048 Changes to build and runtime requirements:
2050 * GCC 6.2 or later is required to build the GNU C Library.
2052 Older GCC versions and non-GNU compilers are still supported when
2053 compiling programs that use the GNU C Library.
2055 Security related changes:
2057 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2058 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2059 has undefined behavior. On x32, the size_t argument may be passed
2060 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2061 32 bits. When it happened with the sign bit of RDX register set,
2062 memcmp gave the wrong result since it treated the size argument as
2063 zero. Reported by H.J. Lu.
2065 CVE-2019-9169: Attempted case-insensitive regular-expression match
2066 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2067 over-read. Reported by Hongxu Chen.
2069 The following bugs are resolved with this release:
2071 [2872] locale: Transliteration Cyrillic -> ASCII fails
2072 [6399] libc: gettid() should have a wrapper
2073 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2074 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2075 [17396] localedata: globbing for locale by [[.collating-element.]]
2076 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2077 [18465] malloc: memusagestat is built using system C library
2078 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2079 invalid input drops valid char
2080 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2081 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2082 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2083 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2084 [23352] malloc: __malloc_check_init still defined in public header
2086 [23403] nptl: Wrong alignment of TLS variables
2087 [23501] libc: nftw() doesn't return dangling symlink's inode
2088 [23733] malloc: Check the count before calling tcache_get()
2089 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2091 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2092 [23844] nptl: pthread_rwlock_trywrlock results in hang
2093 [23983] argparse: Missing compat versions of argp_failure and argp_error
2094 for long double = double
2095 [23984] libc: Missing compat versions of err.h and error.h functions for
2096 long double = double
2097 [23996] localedata: Dutch salutations
2098 [24040] libc: riscv64: unterminated call chain in __thread_start
2099 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2101 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2102 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2104 [24114] regex: regexec buffer read overrun in "grep -i
2105 '\(\(\)*.\)*\(\)\(\)\1'"
2106 [24122] libc: Segfaults if 0 returned from la_version
2107 [24153] stdio: Some input functions do not react to stdin assignment
2108 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2109 RDX is set) (CVE-2019-7309)
2110 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2111 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2112 not the default "nor"
2113 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2114 false positives, change to modern flexible array
2115 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2116 instructions while maintaining the robust mutex list due to missing
2118 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2119 unnecessary librt dependencies
2120 [24200] localedata: Revert first_weekday removal in en_IE locale
2121 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2122 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2123 [24216] malloc: Check for large bin list corruption when inserting
2125 [24228] stdio: old x86 applications that use legacy libio crash on exit
2126 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2128 [24293] localedata: Missing Minguo calendar support for TW locales
2129 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2130 tt_RU (Tatar) locale
2131 [24307] localedata: Update locale data to Unicode 12.0.0
2132 [24323] dynamic-link: dlopen should not be able open PIE objects
2133 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2134 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2135 tt_RU (Tatar) locale
2136 [24370] localedata: Add lang_name for tt_RU locale
2137 [24372] locale: Binary locale files are not architecture independent
2138 [24394] time: strptime %Ey mis-parses final year of era
2139 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2141 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2143 [24531] malloc: Malloc tunables give tcache assertion failures
2144 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2146 [24535] localedata: Update locale data to Unicode 12.1.0
2147 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2148 kernels and break testing
2149 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2150 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2151 [-Werror=format-overflow=]
2152 [24570] libc: alpha: compat msgctl uses __IPC_64
2153 [24584] locale: Data race in __wcsmbs_clone_conv
2154 [24588] stdio: Remove codecvt vtables from libio
2155 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2157 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2158 [24632] stdio: Old binaries which use freopen with default stdio handles
2160 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2162 [24652] localedata: szl_PL spelling correction
2163 [24695] nss: nss_db: calling getpwent after endpwent crashes
2164 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2165 in /etc/nsswitch.conf
2166 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2167 [24740] libc: getdents64 type confusion
2168 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2169 always implemented in the same library
2170 [24744] libc: Remove copy_file_range emulation
2171 [24757] malloc: memusagestat is linked against system libpthread
2172 [24794] libc: Partial test suite run builds corrupt test-in-container
2180 * The getcpu wrapper function has been added, which returns the currently
2181 used CPU and NUMA node. This function is Linux-specific.
2183 * A new convenience target has been added for distribution maintainers
2184 to build and install all locales as directories with files. The new
2185 target is run by issuing the following command in your build tree:
2186 'make localedata/install-locale-files', with an optional DESTDIR
2187 to set the install root if you wish to install into a non-default
2188 configured location.
2190 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2192 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2193 for _GNU_SOURCE, to match BSD environments.
2195 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2196 indicates that it will abort the transaction prior to entering the kernel
2197 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2198 suspended, and this caused some undefined side-effects issues by aborting
2199 transactions manually. Glibc avoided it by abort transactions manually on
2200 each syscall, but it lead to performance issues on newer kernels where the
2201 HTM state is saved and restore lazily (the state being saved even when the
2202 process actually does not use HTM).
2204 * The functions posix_spawn_file_actions_addchdir_np and
2205 posix_spawn_file_actions_addfchdir_np have been added, enabling
2206 posix_spawn and posix_spawnp to run the new process in a different
2207 directory. These functions are GNU extensions. The function
2208 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2211 * The popen and system do not run atfork handlers anymore (BZ#17490).
2212 Although it is a possible POSIX violation, the POSIX rationale in
2213 pthread_atfork documentation regarding atfork handlers is to handle
2214 inconsistent mutex state after a fork call in a multi-threaded process.
2215 In both popen and system there is no direct access to user-defined mutexes.
2217 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2218 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2220 - C-SKY ABIV2 soft-float little-endian
2221 - C-SKY ABIV2 hard-float little-endian
2223 * strftime's default formatting of a locale's alternative year (%Ey)
2224 has been changed to zero-pad the year to a minimum of two digits,
2225 like "%y". This improves the display of Japanese era years during
2226 the first nine years of a new era, and is expected to be harmless
2227 for all other locales (only Japanese locales regularly have
2228 alternative year numbers less than 10). Zero-padding can be
2229 overridden with the '_' or '-' flags (which are GNU extensions).
2231 * As a GNU extension, the '_' and '-' flags can now be applied to
2232 "%EY" to control how the year number is formatted; they have the
2233 same effect that they would on "%Ey".
2235 Deprecated and removed features, and other changes affecting compatibility:
2237 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2238 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2240 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2241 in <sys/procfs.h>, has been corrected to match the type actually used by
2242 the Linux kernel. This affects the size and layout of that structure on
2243 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2245 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2246 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2247 defined in <sys/procfs.h>, has been corrected to match the type actually
2248 used by the Linux kernel. This affects the size and layout of those
2251 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2252 meant to scan a string and allocate space for it with malloc, is now
2253 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2254 defined. This extension conflicts with C99's use of '%a' to scan a
2255 hexadecimal floating-point number, which is now available to programs
2256 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2258 POSIX.1-2008 includes the feature of allocating a buffer for string input
2259 with malloc, using the modifier letter 'm' instead. Programs using
2260 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2261 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2262 C99 '%a' no longer need to avoid _GNU_SOURCE.
2264 GCC's -Wformat warnings can detect most uses of this extension, as long
2265 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2266 __attribute__ ((format (scanf, ...))).
2268 Changes to build and runtime requirements:
2270 * Python 3.4 or later is required to build the GNU C Library.
2272 * On most architectures, GCC 5 or later is required to build the GNU C
2273 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2275 Older GCC versions and non-GNU compilers are still supported when
2276 compiling programs that use the GNU C Library.
2278 Security related changes:
2280 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2281 denial of service due to resource exhaustion when processing getaddrinfo
2282 calls with crafted host names. Reported by Guido Vranken.
2284 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2285 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2286 happened, accessing the 32-bit size_t value as the full 64-bit register
2287 in the assembly string/memory functions would cause a buffer overflow.
2288 Reported by H.J. Lu.
2290 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2291 addresses with arbitrary trailing characters, potentially leading to data
2292 or command injection issues in applications.
2294 The following bugs are resolved with this release:
2296 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2297 [10496] localedata: 12h time representation in multiple locales faulty
2298 [10797] localedata: it_IT locale numeric does not have a separator for
2300 [11319] libc: dprintf doesn't handle errors properly
2301 [16346] time: mktime: potentially unsafe use of localtime_offset
2302 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2304 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2305 posix_spawn_file_actions_addfchdir_np
2306 [17426] localedata: Indian locales: set the correct date format
2307 [17490] stdio: popen should not invoke atfork handlers
2308 [17783] libc: TIOCSER_TEMT conditions inconsistent
2309 [18040] regex: use-after-free in regexec/get_subexp
2310 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2311 [20018] network: getaddrinfo should reject IP addresses with trailing
2312 characters (CVE-2016-10739)
2313 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2314 [20271] libc: Missing "\n" in __libc_fatal calls
2315 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2316 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2317 pointer argument is non-NULL
2318 [21037] stdio: open_memstream and freopen
2319 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2320 [21716] time: Crash in glibc's mktime in low-memory situations
2321 [22834] stdio: Subprocess forked by popen may crash in Linux when
2322 multithreads call popen
2323 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2324 and pthread_create fails.
2325 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2326 [23125] libc: riscv64: endless loop when throwing an exception from a
2328 [23275] nptl: Race in pthread_mutex_lock while promoting to
2329 PTHREAD_MUTEX_ELISION_NP.
2330 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2332 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2334 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2336 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2337 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2339 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2340 [23521] nss: get_next_alias nss_files file stream leak
2341 [23538] nptl: Hang in pthread_cond_broadcast
2342 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2343 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2344 [23579] libc: Errors misreported in preadv2
2345 [23597] build: support/test-container.c doesn't work with different
2347 [23603] time: mktime signed integer overflow on large timestamps
2348 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2349 [23614] libc: powerpc: missing CFI register information in __mpn_*
2351 [23637] string: Generic strstr/strcasestr fails with huge needles
2352 [23640] libc: no way to easily clear FD_CLOEXEC in
2353 posix_spawn_file_actions_adddup2()
2354 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2356 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2358 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2359 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2360 bits/types/struct_rusage.h
2361 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2363 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2365 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2366 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2367 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2369 [23724] localedata: Albanian date formats are incorrect
2370 [23735] math: libnldbl_nonshared.a references internal libm symbols
2371 [23740] localedata: kl_GL: Month names and date formats need update
2372 [23744] regex: regex refactorings to remove BE, avoid duplication
2373 [23745] time: mktime fix for Gnulib + coreutils
2374 [23758] time: Improve the width of alternate representation for year in
2376 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2377 [23789] time: mktime does not set errno on failure
2378 [23791] localedata: Wrong monetary format for ca_ES locale
2379 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2380 [23794] locale: c16rtomb does not handle surrogate pairs
2381 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2382 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2383 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2384 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2385 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2386 [23862] libc: [sh] missing kernel-features.h undefines
2387 [23864] libc: [riscv] missing kernel-features.h undefines
2388 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2389 [23907] malloc: Incorrect double-free malloc tcache check disregards
2391 [23913] libc: off-by-one in function maybe_script_execute in
2392 sysdeps/posix/spawni.c
2393 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2394 [23923] locale: Add --no-hard-links option to localedef
2395 [23927] network: Linux if_nametoindex() does not close descriptor
2397 [23961] math: powf can overflow to inf without setting errno in non-
2398 nearest rounding mode
2399 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2400 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2401 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2402 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2403 [24011] localedata: Fixed small type in comment for locale bs_BA
2404 [24018] libc: gettext() may return NULL
2405 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2406 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2407 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2409 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2410 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2412 [24046] localedata: en_US locale doesn't define date_fmt
2413 [24063] manual: @var{errno} should be @code{errno}
2414 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2415 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2417 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2419 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2421 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2423 [24112] network: Do not send DNS queries for non-host names (where all
2424 answers will be rejected)
2425 [24130] libc: alpha __remqu corrupts $f3 register
2432 * The localization data for ISO 14651 is updated to match the 2016
2433 Edition 4 release of the standard, this matches data provided by
2434 Unicode 9.0.0. This update introduces significant improvements to the
2435 collation of Unicode characters. This release deviates slightly from
2436 the standard in that the collation element ordering for lowercase and
2437 uppercase LATIN script characters is adjusted to ensure that regular
2438 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2439 is not matched by [a-z]. With the update many locales have been
2440 updated to take advantage of the new collation information. The new
2441 collation information has increased the size of the compiled locale
2442 archive or binary locales.
2444 * The GNU C Library can now be compiled with support for Intel CET, AKA
2445 Intel Control-flow Enforcement Technology. When the library is built
2446 with --enable-cet, the resulting glibc is protected with indirect
2447 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2448 compatible with all existing executables and shared libraries. This
2449 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2450 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2451 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2452 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2453 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2454 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2457 * The GNU C Library now has correct support for ABSOLUTE symbols
2458 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2459 relocated incorrectly or in some cases discarded. The GNU linker can
2460 make use of the newer semantics, but it must communicate it to the
2461 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2462 field) to indicate such support is required.
2464 * Unicode 11.0.0 Support: Character encoding, character type info, and
2465 transliteration tables are all updated to Unicode 11.0.0, using
2466 generator scripts contributed by Mike FABIAN (Red Hat).
2468 * <math.h> functions that round their results to a narrower type are added
2469 from TS 18661-1:2014 and TS 18661-3:2015:
2471 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2472 fMxaddfNx functions.
2474 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2475 fMxsubfNx functions.
2477 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2478 fMxmulfNx functions.
2480 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2481 fMxdivfNx functions.
2483 * Two grammatical forms of month names are now supported for the following
2484 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2485 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2486 support two grammatical forms in abbreviated month names: Catalan, Greek,
2489 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2490 include the support for two grammatical forms of month names.
2492 * Building and running on GNU/Hurd systems now works without out-of-tree
2495 * The renameat2 function has been added, a variant of the renameat function
2496 which has a flags argument. If the flags are zero, the renameat2 function
2497 acts like renameat. If the flag is not zero and there is no kernel
2498 support for renameat2, the function will fail with an errno value of
2499 EINVAL. This is different from the existing gnulib function renameatu,
2500 which performs a plain rename operation in case of a RENAME_NOREPLACE
2501 flags and a non-existing destination (and therefore has a race condition
2502 that can clobber the destination inadvertently).
2504 * The statx function has been added, a variant of the fstatat64
2505 function with an additional flags argument. If there is no direct
2506 kernel support for statx, glibc provides basic stat support based on
2507 the fstatat64 function.
2509 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2510 library if installed. libidn2 version 2.0.5 or later is recommended. If
2511 libidn2 is not available, internationalized domain names are not encoded
2512 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2513 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2514 with an encoding error.) Flags which used to change the IDN encoding and
2515 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2516 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2517 deprecated. They no longer have any effect.
2519 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2520 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2521 range of ELF gABI expressions including such constructs as
2522 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2523 have been further restricted, and where in the past a dynamic string
2524 token sequence may have been interpreted as a literal string it will
2525 now cause a load failure. These load failures were always considered
2526 unspecified behaviour from the perspective of the dynamic loader, and
2527 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2528 results in a load failure now.
2530 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2531 implementation includes all the standard functions provided by
2534 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2535 thrd_detach, thrd_exit, and thrd_join for thread management.
2537 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2538 mtx_destroy for mutual exclusion.
2540 - call_once for function call synchronization.
2542 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2543 cnd_wait for conditional variables.
2545 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2547 Application developers must link against libpthread to use ISO C threads.
2549 Deprecated and removed features, and other changes affecting compatibility:
2551 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2552 installed. Software that was using either header should be updated to
2553 use standard <stdio.h> interfaces instead.
2555 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2556 This was never required by the C standard, and the macros just expanded
2557 to call alternative names for the same functions. If you hoped getc and
2558 putc would provide performance improvements over fgetc and fputc, instead
2559 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2560 necessary, flockfile and funlockfile.
2562 * All stdio functions now treat end-of-file as a sticky condition. If you
2563 read from a file until EOF, and then the file is enlarged by another
2564 process, you must call clearerr or another function with the same effect
2565 (e.g. fseek, rewind) before you can read the additional data. This
2566 corrects a longstanding C99 conformance bug. It is most likely to affect
2567 programs that use stdio to read interactive input from a terminal.
2570 * The macros 'major', 'minor', and 'makedev' are now only available from
2571 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2572 headers that happen to include <sys/types.h>. These macros are rarely
2573 used, not part of POSIX nor XSI, and their names frequently collide with
2574 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2575 further explanation.
2577 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2578 these macros should first include <sys/types.h>, and then include
2579 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2581 * The tilegx*-*-linux-gnu configurations are no longer supported.
2583 * The obsolete function ustat is no longer available to newly linked
2584 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2585 function has been deprecated in favor of fstatfs and statfs.
2587 * The obsolete function nfsservctl is no longer available to newly linked
2588 binaries. This function was specific to systems using the Linux kernel
2589 and could not usefully be used with the GNU C Library on systems with
2590 version 3.1 or later of the Linux kernel.
2592 * The obsolete function name llseek is no longer available to newly linked
2593 binaries. This function was specific to systems using the Linux kernel
2594 and was not declared in a header. Programs should use the lseek64 name
2595 for this function instead.
2597 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2598 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2599 previously selected by them is now always enabled.
2601 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2602 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2603 restriction (rejecting '_' in host names, among other things) has been
2604 removed, for increased compatibility with non-IDN name resolution.
2606 * The fcntl function now have a Long File Support variant named fcntl64. It
2607 is added to fix some Linux Open File Description (OFD) locks usage on non
2608 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2609 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2610 locks act as a cancellation entrypoint.
2612 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2613 ecb_crypt, and des_setparity are no longer available to newly linked
2614 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2615 longer installed. These functions encrypted and decrypted data with the
2616 DES block cipher, which is no longer considered secure. Software that
2617 still uses these functions should switch to a modern cryptography library,
2620 * Reflecting the removal of the encrypt and setkey functions above, the
2621 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2622 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2625 * The obsolete function fcrypt is no longer available to newly linked
2626 binaries. It was just another name for the standard function crypt,
2627 and it has not appeared in any header file in many years.
2629 * We have tentative plans to hand off maintenance of the passphrase-hashing
2630 library, libcrypt, to a separate development project that will, we hope,
2631 keep up better with new passphrase-hashing algorithms. We will continue
2632 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2633 'crypt_r' should not need to change at all; however, distributions will
2634 need to install <crypt.h> and libcrypt from a separate project.
2636 In this release, if the configure option --disable-crypt is used, glibc
2637 will not install <crypt.h> or libcrypt, making room for the separate
2638 project's versions of these files. The plan is to make this the default
2639 behavior in a future release.
2641 Changes to build and runtime requirements:
2643 GNU make 4.0 or later is now required to build glibc.
2645 Security related changes:
2647 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2648 been fixed by removing the glibc-internal IDNA implementation and using
2649 the system-provided libidn2 library instead. Originally reported by Hanno
2650 Böck and Christian Weisgerber.
2652 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2653 architecture could corrupt memory. Reported by Max Horn.
2655 CVE-2018-11236: Very long pathname arguments to realpath function could
2656 result in an integer overflow and buffer overflow. Reported by Alexey
2659 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2660 architecture could write beyond the target buffer, resulting in a buffer
2661 overflow. Reported by Andreas Schwab.
2663 The following bugs are resolved with this release:
2665 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2666 [6889] manual: 'PWD' mentioned but not specified
2667 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2668 when __WORDSIZE != 64
2669 [13762] regex: re_search etc. should return -2 on memory exhaustion
2670 [13888] build: /tmp usage during testing
2671 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2672 [14092] nptl: Support C11 threads
2673 [14095] localedata: Review / update collation data from Unicode / ISO
2675 [14508] libc: -Wformat warnings
2676 [14553] libc: Namespace pollution loff_t in sys/types.h
2677 [14890] libc: Make NT_PRFPREG canonical.
2678 [15105] libc: Extra PLT references with -Os
2679 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2681 [16335] manual: Feature test macro documentation incomplete and out of
2683 [16552] libc: Unify umount implementations in terms of umount2
2684 [17082] libc: htons et al.: statement-expressions prevent use on global
2685 scope with -O1 and higher
2686 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2687 [17438] localedata: pt_BR: wrong d_fmt delimiter
2688 [17662] libc: please implement binding for the new renameat2 syscall
2689 [17721] libc: __restrict defined as /* Ignore */ even in c11
2690 [17979] libc: inconsistency between uchar.h and stdint.h
2691 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2692 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2693 horrible machine code)
2694 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2696 [18471] libc: llseek should be a compat symbol
2697 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2699 [18991] nss: nss_files skips large entry in database
2700 [19239] libc: Including stdlib.h ends up with macros major and minor being
2702 [19463] libc: linknamespace failures when compiled with -Os
2703 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2704 [19527] locale: Normalized charset name not recognized by setlocale
2705 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2706 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2708 [19728] network: out of bounds stack read in libidn function
2709 idna_to_ascii_4i (CVE-2016-6261)
2710 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2711 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2712 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2714 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2715 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2716 [20419] dynamic-link: files with large allocated notes crash in
2718 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2719 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2720 [20980] manual: CFLAGS environment variable replaces vital options
2721 [21163] regex: Assertion failure in pop_fail_stack when executing a
2722 malformed regexp (CVE-2015-8985)
2723 [21234] manual: use of CFLAGS makes glibc detect no optimization
2724 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2725 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2726 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2727 [21508] locale: intl/tst-gettext failure with latest msgfmt
2728 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2729 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2730 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2732 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2734 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2735 [22247] network: Integer overflow in the decode_digit function in
2736 puny_decode.c in libidn (CVE-2017-14062)
2737 [22342] nscd: NSCD not properly caching netgroup
2738 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2739 [22550] localedata: es_ES locale (and other es_* locales): collation
2740 should treat ñ as a primary different character, sync the collation
2741 for Spanish with CLDR
2742 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2743 by gcc configured with --enable-default-pie
2744 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2745 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2746 crossing 2GB threshold (CVE-2017-18269)
2747 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2749 [22735] time: Misleading typo in time.h source comment regarding
2751 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2752 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2753 `__assert_perror_fail ()' to `__assert_fail_base ()'
2754 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2756 [22786] libc: Stack buffer overflow in realpath() if input size is close
2757 to SSIZE_MAX (CVE-2018-11236)
2758 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2759 through an absolute DT_NEEDED path
2760 [22792] build: tcb-offsets.h dependency dropped
2761 [22797] libc: pkey_get() uses non-reserved name of argument
2762 [22807] libc: PTRACE_* constants missing for powerpc
2763 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2764 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2765 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2766 [22848] localedata: ca_ES: update date definitions from CLDR
2767 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2768 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2769 [22896] localedata: Update locale data for an_ES
2770 [22902] math: float128 test failures with GCC 8
2771 [22918] libc: multiple common of `__nss_shadow_database'
2772 [22919] libc: sparc32: backtrace yields infinite backtrace with
2774 [22926] libc: FTBFS on powerpcspe
2775 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2777 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2778 [22947] libc: FAIL: misc/tst-preadvwritev2
2779 [22963] localedata: cs_CZ: Add alternative month names
2780 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2781 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2782 [22998] dynamic-link: execstack tests are disabled when SELinux is
2784 [23005] network: Crash in __res_context_send after memory allocation
2786 [23007] math: strtod cannot handle -nan
2787 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2788 [23036] regex: regex equivalence class regression
2789 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2790 [23069] libc: sigaction broken on riscv64-linux-gnu
2791 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2792 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2793 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2794 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2795 and libc build with -Os)
2796 [23140] localedata: More languages need two forms of month names
2797 [23145] libc: _init/_fini aren't marked as hidden
2798 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2799 [23171] math: C++ iseqsig for long double converts arguments to double
2800 [23178] nscd: sudo will fail when it is run in concurrent with commands
2801 that changes /etc/passwd
2802 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2804 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2805 [23208] localedata: New locale - Lower Sorbian (dsb)
2806 [23233] regex: Memory leak in build_charclass_op function in file
2808 [23236] stdio: Harden function pointers in _IO_str_fields
2809 [23250] nptl: Offset of __private_ss differs from GCC
2810 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2811 -mtune=generic -mfpmath=sse
2812 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2814 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2815 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2817 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2818 [23277] math: nan function should not have const attribute
2819 [23279] math: scanf and strtod wrong for some hex floating-point
2820 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2822 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2823 [23303] build: undefined reference to symbol
2824 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2825 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2827 [23313] stdio: libio vtables validation and standard file object
2829 [23329] libc: The __libc_freeres infrastructure is not properly run across
2831 [23349] libc: Various glibc headers no longer compatible with
2833 [23351] malloc: Remove unused code related to heap dumps and malloc
2835 [23363] stdio: stdio-common/tst-printf.c has non-free license
2836 [23396] regex: Regex equivalence regression in single-byte locales
2837 [23422] localedata: oc_FR: More updates of locale data
2838 [23442] build: New warning with GCC 8
2839 [23448] libc: Out of bounds access in IBM-1390 converter
2840 [23456] libc: Wrong index_cpu_LZCNT
2841 [23458] build: tst-get-cpu-features-static isn't added to tests
2842 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2844 [23467] dynamic-link: x86/CET: A property note parser bug
2851 * The GNU C Library can now be compiled with support for building static
2852 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2853 executables are like static executables but can be loaded at any address
2854 and provide additional security hardening benefits at the cost of some
2855 memory and performance. When the library is built with --enable-static-pie
2856 the resulting libc.a is usable with GCC 8 and above to create static PIE
2857 executables using the GCC option '-static-pie'. This feature is currently
2858 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2859 aarch64 with binutils 2.30 or later.
2861 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2862 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2865 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2867 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2869 * In order to support faster and safer process termination the malloc API
2870 family of functions will no longer print a failure address and stack
2871 backtrace after detecting heap corruption. The goal is to minimize the
2872 amount of work done after corruption is detected and to avoid potential
2873 security issues in continued process execution. Reducing shutdown time
2874 leads to lower overall process restart latency, so there is benefit both
2875 from a security and performance perspective.
2877 * The abort function terminates the process immediately, without flushing
2878 stdio streams. Previous glibc versions used to flush streams, resulting
2879 in deadlocks and further data corruption. This change also affects
2880 process aborts as the result of assertion failures.
2882 * On platforms where long double has the IEEE binary128 format (aarch64,
2883 alpha, mips64, riscv, s390 and sparc), the math library now implements
2884 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2885 These are the same interfaces added in version 2.26 for some platforms where
2886 this format is supported but is not the format of long double.
2888 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2889 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2890 implements interfaces for that type, as defined by ISO/IEC TS
2891 18661-3:2015. These are corresponding interfaces to those supported for
2894 * The math library now implements interfaces for the _Float32, _Float64 and
2895 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2896 corresponding interfaces to those supported for _Float128.
2898 * glibc now implements the memfd_create and mlock2 functions on Linux.
2900 * Support for memory protection keys was added. The <sys/mman.h> header now
2901 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2904 * The copy_file_range function was added.
2906 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2908 * The ldconfig utility now processes `include' directives using the C/POSIX
2909 collation ordering. Previous glibc versions used locale-specific
2910 ordering, the change might break systems that relied on that.
2912 * Support for two grammatical forms of month names has been added.
2913 In a call to strftime, the "%B" and "%b" format specifiers will now
2914 produce the grammatical form required when the month is used as part
2915 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2916 required when the month is named by itself. For instance, in Greek
2917 and in many Slavic and Baltic languages, "%B" will produce the month
2918 in genitive case, and "%OB" will produce the month in nominative case.
2920 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2921 are all valid and will all accept any known form of month
2922 name---standalone or complete, abbreviated or full. In a call to
2923 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2924 the strings used by "%B" and "%b", respectively. New query
2925 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2926 used by "%OB" and "%Ob", respectively.
2928 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2929 define the strings for %OB and %Ob, respectively; these have the
2930 same syntax as "mon" and "abmon". These arrays are optional; if they
2931 are not provided then they have the same content as "mon" and "abmon",
2934 These features are provided for locales which define "alt_mon" and/or
2935 "ab_alt_mon" in their locale source data. This release includes such
2936 alternative month name data for the following languages: Belarusian,
2937 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2939 This feature is currently a GNU extension, but it is expected to
2940 be added to the next revision of POSIX, and it is also already
2941 available on some BSD-derived operating systems.
2943 This feature will cause existing statically compiled applications
2944 to fail to load locales and fall back to the builtin C/POSIX locales.
2945 See notes below for other changes affecting compatibility.
2947 * Support for the RISC-V ISA running on Linux has been added. This port
2948 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2949 for the following ISA and ABI pairs:
2955 Deprecated and removed features, and other changes affecting compatibility:
2957 * Statically compiled applications attempting to load locales compiled for the
2958 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2959 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2960 support for two grammatical forms of the month names, also extends the locale
2961 data binary format. Static applications needing locale support must be
2962 recompiled to match the runtime and data they are deployed with. In some
2963 distributions there is an upgrade window where dynamically linked applications
2964 may use a new library but the old locale data and also fall back to the
2965 builtin C/POSIX locales; restarting the application process is sufficient to
2968 * Support for statically linked applications which call dlopen is deprecated
2969 and will be removed in a future version of glibc. Applications which call
2970 dlopen need to be linked dynamically instead.
2972 * Support for old programs which use internal stdio data structures and
2973 functions is deprecated. This includes programs which use the C++ streams
2974 provided by libstdc++ in GCC 2.95. Programs which use the internal
2975 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2976 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2977 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2978 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2979 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2980 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2981 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2982 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2983 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2984 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2985 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2986 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2987 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2988 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2989 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2990 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2991 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2992 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2993 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2994 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2995 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2996 future version of glibc. Unlike other symbol removals, these old
2997 applications will not be supported using compatibility symbols.
2999 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
3000 defined by <sys/ptrace.h>.
3002 * libm no longer supports SVID error handling (calling a user-provided
3003 matherr function on error) or the _LIB_VERSION variable to control error
3004 handling. (SVID error handling and the _LIB_VERSION variable still work
3005 for binaries linked against older versions of the GNU C Library.) The
3006 libieee.a library is no longer provided. math.h no longer defines struct
3007 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
3008 TLOSS, PLOSS and HUGE.
3010 * The libm functions pow10, pow10f and pow10l are no longer supported for
3011 new programs. Programs should use the standard names exp10, exp10f and
3012 exp10l for these functions instead.
3014 * The mcontext_t type is no longer the same as struct sigcontext. On
3015 platforms where it was previously the same, this changes the C++ name
3016 mangling for interfaces involving this type.
3018 * The add-ons mechanism for building additional packages at the same time as
3019 glibc has been removed. The --enable-add-ons configure option is now
3022 * The --without-fp configure option is now ignored. Whether hardware
3023 floating-point instructions are used is now configured based on whether
3024 the compiler used at configure time (without any options implied by a
3025 --with-cpu= configure option) uses such instructions.
3027 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
3028 the specified string can be parsed as a domain name.
3030 * In the malloc_info output, the <heap> element may contain another <aspace>
3031 element, "subheaps", which contains the number of sub-heaps.
3033 * The libresolv function p_secstodate is no longer supported for new
3036 * The tilepro-*-linux-gnu configuration is no longer supported.
3038 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3039 and will be removed in a future release. Software that is still using
3040 either header should be updated to use standard <stdio.h> interfaces
3043 libio.h was originally the header for a set of supported GNU extensions,
3044 but they have not been maintained as such in many years, they are now
3045 standing in the way of improvements to stdio, and we don't think there are
3046 any remaining external users. _G_config.h was never intended for public
3047 use, but predates the bits convention.
3049 Changes to build and runtime requirements:
3051 * bison version 2.7 or later is required to generate code in the 'intl'
3054 Security related changes:
3056 CVE-2009-5064: The ldd script would sometimes run the program under
3057 examination directly, without preventing code execution through the
3058 dynamic linker. (The glibc project disputes that this is a security
3059 vulnerability; only trusted binaries must be examined using the ldd
3062 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3063 suffered from a one-byte overflow during ~ operator processing (either
3064 on the stack or the heap, depending on the length of the user name).
3065 Reported by Tim Rühsen.
3067 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3068 would sometimes fail to free memory allocated during ~ operator
3069 processing, leading to a memory leak and, potentially, to a denial
3072 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3073 without GLOB_NOESCAPE, could write past the end of a buffer while
3074 unescaping user names. Reported by Tim Rühsen.
3076 CVE-2017-17426: The malloc function, when called with an object size near
3077 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3078 instead of NULL. This was a regression introduced with the new malloc
3079 thread cache in glibc 2.26. Reported by Iain Buclaw.
3081 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3082 to the allocation of too much memory. (This is not a security bug per se,
3083 it is mentioned here only because of the CVE assignment.) Reported by
3086 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3087 of the number of search path components. (This is not a security
3088 vulnerability per se because no trust boundary is crossed if the fix for
3089 CVE-2017-1000366 has been applied, but it is mentioned here only because
3090 of the CVE assignment.) Reported by Qualys.
3092 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3093 for AT_SECURE or SUID binaries could be used to load libraries from the
3096 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3097 succeeds without returning an absolute path due to unexpected behaviour
3098 of the Linux kernel getcwd syscall. Reported by halfdog.
3100 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3101 an object size near the value of SIZE_MAX, would return a pointer to a
3102 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3104 CVE-2018-6551: The malloc function, when called with an object size near
3105 the value of SIZE_MAX, would return a pointer to a buffer which is too
3106 small, instead of NULL.
3108 The following bugs are resolved with this release:
3110 [866] glob: glob should match dangling symlinks
3111 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3112 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3114 [5997] math: Very slow execution of sinf function
3115 [10580] localedata: hr_HR: updated locale
3116 [10871] locale: 'mon' array should contain both nominative and genitive
3118 [12349] localedata: eu_ES: incorrect thousands separator
3119 [13605] localedata: shn_MM: new Shan locale
3120 [13805] localedata: ru_RU: currency should use ',' as radix point
3121 [13953] localedata: km_KH: locale update
3122 [13994] localedata: mjw_IN: new locale
3123 [14121] build: make writes .mo files in po directory
3124 [14333] libc: Fix the race between atexit() and exit()
3125 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3126 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3128 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3129 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3130 width Latin characters
3131 [15332] localedata: es_CU: locale update
3132 [15436] stdio: Don't close or flush stdio streams on abort
3133 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3135 [16148] localedata: ca_ES: incorrect thousands separator
3136 [16750] dynamic-link: ldd should not try to execute the binaries
3138 [16777] localedata: pl_PL: incorrect thousands separator in locale
3139 [16905] localedata: hanzi: new collation
3140 [17563] localedata: cmn_TW: add hanzi collation
3141 [17750] localedata: wrong collation order of diacritics in most locales
3142 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3144 [17956] build: Build fails on missing definitions from header file
3145 nss/nss.h when Mozilla NSS is used for cryptography
3146 [18203] libc: realpath() does not handle unreachable paths correctly
3147 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3148 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3149 [18822] libc: Internal functions are called via PLT
3150 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3151 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3152 [19574] libc: glibc should support building static PIE binaries
3153 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3155 [19971] glob: glob: Do not skip entries with zero d_ino values
3156 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3157 [20008] localedata: km_KH: convert to translit_neutral
3158 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3159 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3160 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3161 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3162 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3164 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3165 they're set, wrong errors returned by gaih_inet when lookup functions
3167 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3168 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3170 [20952] localedata: yuw_PG: new locale
3171 [21084] localedata: charmaps/IBM858: new codepage
3172 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3173 [21242] libc: assert gives pedantic warning in old gcc versions
3174 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3175 __regcall calling convention
3176 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3177 [21326] libc: C99 functions are not declared for C++11 and later if
3178 _GNU_SOURCE is not predefined by g++
3179 [21457] libc: sys/ucontext.h namespace
3180 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3181 [21660] math: GCC fails to compile a formula with tgmath.h
3182 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3183 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3184 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3185 [21684] math: tgmath.h handling of complex integers
3186 [21685] math: tgmath.h handling of bit-fields
3187 [21686] math: tgmath.h handling of __int128
3188 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3190 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3192 [21750] localedata: column width of characters incompatible with classical
3194 [21754] malloc: malloc: Perform as little work as possible after heap
3195 consistency check failures
3196 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3197 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3198 [21791] string: Unused XXX_chk_XXX functions in libc.a
3199 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3201 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3203 [21845] localedata: Added new Locale bho_NP
3204 [21853] localedata: Fix abday Which looks same as day in zh_SG
3205 [21854] localedata: Added New Locale en_SC
3206 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3207 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3208 _dl_runtime_resolve_avx_slow
3209 [21885] network: getaddrinfo: gethosts does not release resolver context
3210 on memory allocation failure
3211 [21899] libc: XPG4.2 sigaction namespace
3212 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3214 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3216 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3217 errno value, causing getaddrinfo to fail
3218 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3219 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3220 instead of EAI_NODATA
3221 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3222 constant PTRACE_SEIZE_DEVEL
3223 [21930] math: C-only gcc builtins used in <math.h> isinf
3224 [21932] network: Unpaired __resolv_context_get in generic get*_r
3226 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3227 [21944] libc: sigval namespace
3228 [21951] localedata: Update hanzi collation by stroke
3229 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3230 sysdeps/x86_64/fpu/e_expf.S
3231 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3232 allocation in syscall loops)
3233 [21959] localedata: Fix Country name for xh_ZA
3234 [21960] localedata: Fix abmon for bem_ZM
3235 [21966] math: AVX2 mathvec functions use FMA without checking
3236 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3237 [21971] localedata: Added New Locale for mfe_MU
3238 [21972] libc: assert macro requires operator== (int) for its argument type
3239 [21973] math: [sparc] libm missing sqrtl compat symbol
3240 [21974] libc: Remove __bb_init_func and __bb_exit_func
3241 [21982] string: stratcliff.c: error: assuming signed overflow does not
3243 [21986] stdio: __guess_grouping is called incorrectly
3244 [21987] math: [sparc32] wrong bits/long-double.h installed
3245 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3247 [22022] localedata: Missing country_name for mni_IN
3248 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3250 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3252 [22026] locale: iconv_open: heap overflow on gconv_init failure
3253 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3254 [22035] math: [m68k] bits/math-inline.h macro namespace
3255 [22038] localedata: Fix abbreviated weeks and months for Somali
3256 [22044] localedata: Remove redundant data for Limburgish Language
3257 [22050] malloc: Linking with -lmcheck does not hook
3258 __malloc_initialize_hook correctly
3259 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3260 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3261 [22070] localedata: charmaps/UTF-8: wcwidth for
3262 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3263 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3264 Jungseong and Jongseong) should be 0
3265 [22078] nss: nss_files performance issue in multi mode
3266 [22082] math: bits/math-finite.h exp10 condition
3267 [22086] libc: pcprofiledump incorrect cross-endian condition
3268 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3269 [22095] network: Name server address allocation memory leak in resolv.conf
3271 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3273 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3274 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3276 [22111] malloc: malloc: per thread cache is not returned when thread exits
3277 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3278 [22134] libc: [linux] implement fexecve with execveat
3279 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3281 [22145] libc: ttyname() gives up too early in the face of namespaces
3282 [22146] math: C++ build issue with float128 on x86_64
3283 [22153] nptl: nptl: save error code before process termination
3284 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3285 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3286 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3287 [22165] libc: [hppa] Text relocations in libc.so
3288 [22180] libc: destructor registered via __cxa_atexit is called twice
3289 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3290 symlinks") cause "make" segfaults
3291 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3293 [22207] libc: FAIL: stdlib/test-atexit-race
3294 [22225] math: nearbyint arithmetic moved before feholdexcept
3295 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3296 [22235] math: iscanonical in C++ and float128
3297 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3298 the svid compat wrapper
3299 [22244] math: ynf and yn are wrong without the svid compat wrapper
3300 [22273] libc: Improper assert in Linux posix_spawn implementation
3301 [22284] libc: -pg -pie doesn't work
3302 [22292] locale: localedef exits with error 4 when it should be error 1
3303 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3304 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3306 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3307 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3309 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3310 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3311 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3312 [22322] libc: [mips64] wrong bits/long-double.h installed
3313 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3314 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3316 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3317 [22343] malloc: Integer overflow in posix_memalign
3318 [22347] libc: getrandom() returns the number of bytes that were copied to
3319 the buffer even though the comments say "Return 0 on success and -1 on
3321 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3322 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3324 [22370] dynamic-link: Incorrect note padding check
3325 [22375] libc: malloc returns pointer from tcache_get when should return
3326 NULL (CVE-2017-17426)
3327 [22377] math: iseqsig, float128 and C++
3328 [22382] localedata: Error in tpi_PG locale
3329 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3330 inside the ASCII printable range
3331 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3333 [22403] localedata: Slash needs escaping in some locales
3334 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3335 [22409] network: res_hnok does not accept some host names used on the
3337 [22412] network: res_dnok, res_hnok should perform syntax checks
3338 [22413] network: ns_name_pton ignores syntactically invalid trailing
3340 [22415] stdio: setvbuf can lead to invalid free/segfault
3341 [22432] build: Non-deterministic build
3342 [22439] malloc: malloc_info should compute summary statistics for all sub-
3344 [22442] network: if_nametoindex could report index for the wrong
3345 networking interface
3346 [22446] build: aliasing violation calling readlink in handle_request
3347 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3348 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3349 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3350 __nscd_hash/__nss_hash
3351 [22463] network: p_secstodate overflow handling
3352 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3353 [22478] libc: sigwait can fail with EINTR
3354 [22505] libc: ldconfig processes include directive in locale-specific
3356 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3357 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3358 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3359 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3360 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3361 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3362 same as for Croatian
3363 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3364 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3365 [22577] libc: missing newline after "cannot allocate TLS data structures
3367 [22588] manual: manual/conf.texi: missing underscore in front of
3369 [22593] math: nextafter and nexttoward are declared with const attribute
3370 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3371 [22603] string: ia64 memchr overflows internal pointer check
3372 [22605] libc: SH clone does not set the exit code correctly
3373 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3375 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3376 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3377 modified in case of success
3378 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3379 [22615] manual: manual: ambiguous wording about errno value in case of
3381 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3383 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3384 binaries or if /proc is not mounted (CVE-2017-16997)
3385 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3386 [22630] build: $(no-pie-ldflag) is no longer effective
3387 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3388 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3389 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3390 [22637] nptl: guard size is subtracted from thread stack size instead of
3392 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3393 [22657] localedata: hu_HU: Avoid double space in date
3394 [22660] math: fmax, fmin sNaN handling on alpha
3395 [22664] libc: New warning of GCC8
3396 [22665] math: alpha: ceil and floor raise inexact exceptions
3397 [22666] math: alpha: trunc raise inexact exceptions
3398 [22667] libc: makecontext lacks stack alignment on i386
3399 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3400 [22679] libc: getcwd(3) can succeed without returning an absolute path
3402 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3403 elision and tunables
3404 [22687] math: [powerpc-nofpu] complex long double functions spurious
3406 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3407 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3408 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3410 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3411 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3413 [22701] nis: Incomplete removal of libnsl
3414 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3415 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3416 [22715] dynamic-link: FAIL: elf/tst-audit10
3417 [22719] libc: Backtrace tests fail on hppa
3418 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3419 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3420 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3421 before the first call to crypt_r () in crypt/badsalttest.c
3428 * A per-thread cache has been added to malloc. Access to the cache requires
3429 no locks and therefore significantly accelerates the fast path to allocate
3430 and free small amounts of memory. Refilling an empty cache requires locking
3431 the underlying arena. Performance measurements show significant gains in a
3432 wide variety of user workloads. Workloads were captured using a special
3433 instrumented malloc and analyzed with a malloc simulator. Contributed by
3434 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3436 * Unicode 10.0.0 Support: Character encoding, character type info, and
3437 transliteration tables are all updated to Unicode 10.0.0, using
3438 generator scripts contributed by Mike FABIAN (Red Hat).
3439 These updates cause user visible changes, especially the changes in
3440 wcwidth for many emoji characters cause problems when emoji sequences
3441 are rendered with pango, see for example:
3442 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3444 * Collation of Hungarian has been overhauled and is now consistent with "The
3445 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3448 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3450 - The GNU C Library will now detect when /etc/resolv.conf has been
3451 modified and reload the changed configuration. The new resolver option
3452 “no-reload” (RES_NORELOAD) disables this behavior.
3454 - The GNU C Library now supports an arbitrary number of search domains
3455 (configured using the “search” directive in /etc/resolv.conf);
3456 previously, there was a hard limit of six domains. For backward
3457 compatibility, applications that directly modify the ‘_res’ global
3458 object are still limited to six search domains.
3460 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3461 Library will now randomly pick a name server from the configuration as a
3462 starting point. (Previously, the second name server was always used.)
3464 * The tunables feature is now enabled by default. This allows users to tweak
3465 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3467 * New function reallocarray, which resizes an allocated block (like realloc)
3468 to the product of two sizes, with a guaranteed clean failure upon integer
3469 overflow in the multiplication. Originally from OpenBSD, contributed by
3470 Dennis Wölfing and Rüdiger Sonderfeld.
3472 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3473 These are extended versions of preadv and pwritev, respectively, taking an
3474 additional flags argument. The set of supported flags depends on the
3475 running kernel; full support currently requires kernel 4.7 or later.
3477 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3478 create a new session ID for the spawned process. This feature is
3479 scheduled to be added to the next major revision of POSIX; for the time
3480 being, it is available under _GNU_SOURCE.
3482 * errno.h is now safe to use from C-preprocessed assembly language on all
3483 supported operating systems. In this context, it will only define the
3484 Exxxx constants, as preprocessor macros expanding to integer literals.
3486 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3487 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3488 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3489 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3491 To compile programs that use this feature, the compiler must support
3492 128-bit floating point with the type name _Float128 (as defined by TS
3493 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3494 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3495 must be defined to make the new interfaces visible.
3497 The new functions and macros correspond to those present for other
3498 floating-point types (except for a few obsolescent interfaces not
3499 supported for the new type), with F128 or f128 suffixes; for example,
3500 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3501 printf or scanf formats for the new type; the strfromf128 and strtof128
3502 interfaces should be used instead.
3504 Deprecated and removed features, and other changes affecting compatibility:
3506 * The synchronization that pthread_spin_unlock performs has been changed to
3507 now be equivalent to a C11 atomic store with release memory order to the
3508 spin lock's memory location. Previously, several (but not all)
3509 architectures used stronger synchronization (e.g., containing what is
3510 often called a full barrier). This change can improve performance, but
3511 may affect odd fringe uses of spin locks that depend on the previous
3512 behavior (e.g., using spin locks as atomic variables to try to implement
3513 Dekker's mutual exclusion algorithm).
3515 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3518 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3519 will only be built and installed when the GNU C Library is configured with
3520 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3521 as TIRPC or rpcsvc-proto, to be used.
3523 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3524 libnss_compat, are deprecated, and will not be built or installed by
3527 The NIS(+) support library, libnsl, is also deprecated. By default, a
3528 compatibility shared library will be built and installed, but not headers
3529 or development libraries. Only a few NIS-related programs require this
3530 library. (In particular, the GNU C Library has never required programs
3531 that use 'gethostbyname' to be linked with libnsl.)
3533 Replacement implementations based on TIRPC, which additionally support
3534 IPv6, are available from <https://github.com/thkukuk/>. The configure
3535 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3536 name service modules, to be built and installed.
3538 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3539 support is enabled, the configured recursive resolver must support EDNS.
3540 (Responding to EDNS-enabled queries with responses which are not
3541 EDNS-enabled is fine, but FORMERR responses are not.)
3543 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3544 servers have not supported this opcode for a long time.
3546 * The _res_opcodes variable has been removed from libresolv. It had been
3547 exported by accident.
3549 * <string.h> no longer includes inline versions of any string functions,
3550 as this kind of optimization is better done by the compiler. The macros
3551 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3553 * The nonstandard header <xlocale.h> has been removed. Most programs should
3554 use <locale.h> instead. If you have a specific need for the definition of
3555 locale_t with no other declarations, please contact
3556 libc-alpha@sourceware.org and explain.
3558 * The obsolete header <sys/ultrasound.h> has been removed.
3560 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3562 * The obsolete function cfree has been removed. Applications should use
3565 * The stack_t type no longer has the name struct sigaltstack. This changes
3566 the C++ name mangling for interfaces involving this type.
3568 * The ucontext_t type no longer has the name struct ucontext. This changes
3569 the C++ name mangling for interfaces involving this type.
3571 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3572 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3573 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3574 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3575 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3576 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3577 fpregset_t type no longer has the name struct fpu. This changes the C++
3578 name mangling for interfaces involving those types.
3580 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3581 synced with the kernel:
3583 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3584 are not supported on this architecture and have been removed.
3586 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3587 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3588 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3590 Programs that assume the GET/SETREGS ptrace requests are universally
3591 available will now fail to build, instead of malfunctioning at runtime.
3593 Changes to build and runtime requirements:
3595 * Linux kernel 3.2 or later is required at runtime, on all architectures
3596 supported by that kernel. (This is a change from version 2.25 only for
3599 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3601 * On most architectures, GCC 4.9 or later is required to build the GNU C
3602 Library. On powerpc64le, GCC 6.2 or later is required.
3604 Older GCC versions and non-GNU compilers are still supported when
3605 compiling programs that use the GNU C Library. (We do not know exactly
3606 how old, and some GNU extensions to C may be _de facto_ required. If you
3607 are interested in helping us make this statement less vague, please
3608 contact libc-alpha@sourceware.org.)
3610 Security related changes:
3612 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3613 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3615 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3616 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3618 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3619 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3622 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3623 fixed (CVE-2017-12133).
3625 The following bugs are resolved with this release:
3627 [984] network: Respond to changed resolv.conf in gethostbyname
3628 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3629 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3631 [12189] libc: __stack_chk_fail should not attempt a backtrace
3633 [14096] time: Race condition on timezone/tst-timezone.out
3634 [14172] localedata: az_IR: new locale
3635 [14995] build: glibc fails to build if gold is the default linker, even if
3637 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3638 [16637] network: inet_pton function is accepting IPv6 with bad format
3639 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3640 x86 and other generic code
3641 [16875] localedata: ko_KR: fix lang_name
3642 [17225] localedata: ar_SY: localized month names for May and June are
3644 [17297] localedata: da_DK: wrong date_fmt string
3645 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3646 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3647 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3648 [19066] localedata: ar_SA abbreviated day and month names are in English
3649 [19569] network: resolv: Support an arbitrary number of search domains
3650 [19570] network: Implement random DNS server selection in the stub
3652 [19838] locale: localedef fails on PA-RISC
3653 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3654 order of 0D36 and 0D37
3655 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3657 [20098] libc: FAIL: debug/backtrace-tst on hppa
3658 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3660 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3662 [20313] localedata: Update locale data to Unicode 9.0
3663 [20424] manual: Document how to provide a malloc replacement
3664 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3666 [20686] locale: Add el_GR@euro to SUPPORTED.
3667 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3668 failures consistently
3669 [21015] dynamic-link: Document and fix --enable-bind-now
3670 [21016] nptl: pthread_cond support is broken on hppa
3671 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3672 frame-pointer on i386
3673 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3675 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3676 [21088] libc: Build fails with --enable-static-nss
3677 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3678 generic c code is used
3679 [21109] libc: Tunables broken on big-endian
3680 [21112] math: powf has large ulp errors with base close to 1 and exponent
3682 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3684 [21120] malloc: glibc malloc is incompatible with GCC 7
3685 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3687 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3688 (-0.0) when linking with -lieee
3689 [21171] math: log10, log2 and lgamma return incorrect results
3690 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3691 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3692 [21207] localedata: ce_RU: update weekdays from CLDR
3693 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3694 [21217] localedata: Update months from CLDR-31
3695 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3696 [21243] libc: support_delete_temp_file should issue warning for failed
3698 [21244] libc: support resolv_test_start() socket fd close should be
3700 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3701 new posix_spawn implementation
3702 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3703 leads to lower CPU frequency
3704 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3705 [21261] libc: [sparc64] bits/setjmp.h namespace
3706 [21267] network: [mips] bits/socket.h IOC* namespace
3707 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3708 [21270] libc: mmap64 silently truncates large offset values
3709 [21275] libc: posix_spawn always crashes on ia64 now
3710 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3711 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3712 [21289] libc: Incorrect declaration for 32-bit platforms with
3713 _FILE_OFFSET_BITS=64 causes build error
3714 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3715 not support gethostbyname4_r
3716 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3718 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3720 [21340] libc: Support POSIX_SPAWN_SETSID
3721 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3722 [21359] network: ns_name_pack needs additional byte in destination buffer
3723 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3724 against fragmentation attacks (CVE-2017-12132)
3725 [21369] network: resolv: Remove EDNS fallback
3726 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3728 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3729 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3730 [21393] stdio: Missing dup3 error check in freopen, freopen64
3731 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3732 [21399] localedata: Bad description for U00EC in
3733 localedata/charmaps/CP1254
3734 [21411] malloc: realloc documentation error
3735 [21426] network: sys/socket.h uio.h namespace
3736 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3737 [21445] libc: signal.h bsd_signal namespace
3738 [21455] network: Network headers stdint.h namespace
3739 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3741 [21475] network: resolv: Overlong search path is truncated mid-label
3742 [21511] libc: sigstack namespace
3743 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3744 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3745 bits/syscall.h: No such file or directory
3746 [21517] libc: struct sigaltstack namespace
3747 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3748 [21533] localedata: Update locale data to Unicode 10.0
3750 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3751 junk at end of line, first unrecognized character is `@'
3752 [21538] libc: SIG_HOLD missing for XPG4
3753 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3754 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3755 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3756 [21543] libc: sigevent namespace
3757 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3758 size for general purpose registers in mcontext_t structure
3759 [21550] libc: sigwait namespace
3760 [21552] libc: XPG4 bsd_signal namespace
3761 [21554] libc: sigpause namespace
3762 [21560] libc: sys/wait.h signal.h namespace
3763 [21561] libc: waitid namespace
3764 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3765 '/usr/include/stdlib.h': Permission denied
3766 [21575] libc: sys/wait.h missing struct rusage definition
3767 [21584] libc: sigaltstack etc namespace
3768 [21597] libc: siginterrupt namespace
3769 [21607] math: hppa: FAIL: math/test-tgmath
3770 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3772 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3773 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3774 stack and heap (CVE-2017-1000366)
3775 [21625] libc: wait3 namespace
3776 [21654] nss: Incorrect pointer alignment in NSS group merge result
3778 [21657] network: Parse interface zone id for node-local multicast
3779 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3781 [21666] libc: .symver is used on common symbol
3782 [21668] network: resolv: res_init cross-thread broadcast introduces race
3784 [21687] math: tgmath.h totalorder, totalordermag return type
3785 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3787 [21696] libc: Incorrect assumption of of __cpu_mask in
3788 posix/sched_cpucount.c
3789 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3790 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3792 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3793 leading to relocation crash
3794 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3795 `resolv_conf_matches (resp, conf)' failed.
3796 [21710] localedata: Added Samoan language locale for Samoa
3797 [21711] localedata: Pashto yesstr/nostr locale are missing
3798 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3799 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3800 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3801 [21723] localedata: yesstr/nostr missing for Chinese language locale
3802 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3804 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3806 [21728] localedata: New Locale for Tongan language
3807 [21729] localedata: incorrect LC_NAME fields for hi_IN
3808 [21733] localedata: yesstr and nostr are missing for zh_HK
3809 [21734] localedata: Missing yesstr and nostr are for kw_GB
3810 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3811 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3812 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3813 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3815 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3817 [21749] localedata: Wrong abbreviated day name (“abday”) for
3819 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3820 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3821 [21759] localedata: missing yesstr and nostr for Tigrinya
3822 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3823 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3824 [21767] localedata: Missing Bislama locales
3825 [21768] localedata: Missing yesstr and nostr for aa_ET
3826 [21770] localedata: Missing Field in li_NL
3827 [21778] nptl: Robust mutex may deadlock
3828 [21779] libc: MicroBlaze segfaults when loading libpthread
3829 [21783] localedata: Fix int_select international_call_prefixes
3830 [21784] localedata: Inconsistency in country_isbn
3831 [21788] localedata: Missing Country Postal Abbreviations
3832 [21794] localedata: Added-country_isbn-for-Italy
3833 [21795] localedata: Add/Fix country_isbn for France
3834 [21796] localedata: Added country_isbn for Republic of Korea
3835 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3836 [21799] localedata: Added int_select international_call_prefixes
3837 [21801] localedata: Added int_select international_call_prefixes
3838 [21804] nptl: Double semicolon in thread-shared-types.h
3839 [21807] localedata: LC_ADDRESS fix for pap_CW
3840 [21808] localedata: Fix LC_ADDRESS for pap_AW
3841 [21821] localedata: Added country_name in mai_IN
3842 [21822] localedata: Fix LC_TIME for mai_IN
3843 [21823] localedata: missing yesstr, nostr for sa_IN
3844 [21825] localedata: Fix name_mrs for mag_IN
3845 [21828] localedata: 2.26 changelog should mention user visible changes
3847 [21835] localedata: Added Maithili language locale for Nepal
3848 [21838] localedata: Removed redundant data for the_NP
3849 [21839] localedata: Fix LC_MONETARY for ta_LK
3850 [21844] localedata: Fix Latin characters and Months Sequence.
3851 [21848] localedata: Fix mai_NP Title Name
3856 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3857 24731-2:2010, is supported to enable declarations of functions from that
3858 TR. Note that not all functions from that TR are supported by the GNU C
3861 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3862 18661-1:2014, is supported to enable declarations of functions and macros
3863 from that TS. Note that not all features from that TS are supported by
3866 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3867 18661-4:2015, is supported to enable declarations of functions and macros
3868 from that TS. Note that most features from that TS are not supported by
3871 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3872 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3873 Since the GNU C Library defaults to a much newer revision of POSIX, this
3874 will only affect programs that specifically request an old conformance
3875 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3876 see a change in the visible declarations, but a program compiled with
3877 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3880 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3881 defined by all multithreaded code, but glibc has not required this for
3884 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3885 means that in a future release, the macros “major”, “minor”, and “makedev”
3886 will only be available from <sys/sysmacros.h>.
3888 These macros are not part of POSIX nor XSI, and their names frequently
3889 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3890 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3891 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3894 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3895 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3896 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3898 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3899 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3900 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3901 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3902 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3903 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3904 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3905 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3906 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3907 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3908 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3911 * New <math.h> features are added from TS 18661-1:2014:
3913 - Signaling NaN macros: SNANF, SNAN, SNANL.
3915 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3916 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3917 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3919 - llogb functions: the llogb, llogbf and llogbl functions, and the
3920 FP_LLOGB0 and FP_LLOGBNAN macros.
3922 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3925 - Comparison macros: iseqsig.
3927 - Classification macros: iscanonical, issubnormal, iszero.
3929 - Total order functions: totalorder, totalorderf, totalorderl,
3930 totalordermag, totalordermagf, totalordermagl.
3932 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3934 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3935 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3937 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3938 are added to libc. They convert a floating-point number into string.
3940 * Most of glibc can now be built with the stack smashing protector enabled.
3941 It is recommended to build glibc with --enable-stack-protector=strong.
3942 Implemented by Nick Alcock (Oracle).
3944 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3945 intended to be used instead of memset() to erase sensitive data after use;
3946 the compiler will not optimize out calls to explicit_bzero even if they
3947 are "unnecessary" (in the sense that no _correct_ program can observe the
3948 effects of the memory clear).
3950 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3951 to float instead of double. This does not affect the ABI of any libraries
3952 that are part of the GNU C Library, but may affect the ABI of other
3953 libraries that use this type in their interfaces.
3955 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3956 float_t and double_t types are now defined to long double instead of float
3957 and double. These options are not the default, and this does not affect
3958 the ABI of any libraries that are part of the GNU C Library, but it may
3959 affect the ABI of other libraries that use this type in their interfaces,
3960 if they are compiled or used with those options.
3962 * The getentropy and getrandom functions, and the <sys/random.h> header file
3965 * The buffer size for byte-oriented stdio streams is now limited to 8192
3966 bytes by default. Previously, on Linux, the default buffer size on most
3967 file systems was 4096 bytes (and thus remains unchanged), except on
3968 network file systems, where the buffer size was unpredictable and could be
3969 as large as several megabytes.
3971 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3972 for the Linux quota interface which predates kernel version 2.4.22 has
3975 * The malloc_get_state and malloc_set_state functions have been removed.
3976 Already-existing binaries that dynamically link to these functions will
3977 get a hidden implementation in which malloc_get_state is a stub. As far
3978 as we know, these functions are used only by GNU Emacs and this change
3979 will not adversely affect already-built Emacs executables. Any undumped
3980 Emacs executables, which normally exist only during an Emacs build, should
3981 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3983 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3984 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3985 “no-ip6-dotint” had already been the default, and support for the
3986 “ip6-dotint” option was removed from the Internet in 2006.
3988 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3989 flag from <resolv.h> have been removed. The option relied on a
3990 backwards-incompatible DNS extension which was never deployed on the
3993 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3994 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3995 They were already unimplemented.
3997 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3998 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3999 removed again from the IETF name lookup interface specification in RFC
4000 2553. Applications should use getaddrinfo instead.
4002 * DNSSEC-related declarations and definitions have been removed from the
4003 <arpa/nameser.h> header file, and libresolv will no longer attempt to
4004 decode the data part of DNSSEC record types. Previous versions of glibc
4005 only implemented minimal support for the previous version of DNSSEC, which
4006 is incompatible with the currently deployed version.
4008 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
4009 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
4010 <arpa/nameser.h> header file because the distinction between RR types and
4011 meta-RR types is not officially standardized, subject to revision, and
4012 thus not suitable for encoding in a macro.
4014 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
4015 and rhook members of the res_state type in <resolv.h> have been removed.
4016 The glibc stub resolver did not support these hooks, but the header file
4017 did not reflect that.
4019 * For multi-arch support it is recommended to use a GCC which has
4020 been built with support for GNU indirect functions. This ensures
4021 that correct debugging information is generated for functions
4022 selected by IFUNC resolvers. This support can either be enabled by
4023 configuring GCC with '--enable-gnu-indirect-function', or by
4024 enabling it by default by setting 'default_gnu_indirect_function'
4025 variable for a particular architecture in the GCC source file
4028 * GDB pretty printers have been added for mutex and condition variable
4029 structures in POSIX Threads. When installed and loaded in gdb these pretty
4030 printers show various pthread variables in human-readable form when read
4031 using the 'print' or 'display' commands in gdb.
4033 * Tunables feature added to allow tweaking of the runtime for an application
4034 program. This feature can be enabled with the '--enable-tunables' configure
4035 flag. The GNU C Library manual has details on usage and README.tunables has
4036 instructions on adding new tunables to the library.
4038 * A new version of condition variables functions have been implemented in
4039 the NPTL implementation of POSIX Threads to provide stronger ordering
4042 * A new version of pthread_rwlock functions have been implemented to use a more
4043 scalable algorithm primarily through not using a critical section anymore to
4046 Security related changes:
4048 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4049 have been created with makecontext could fail to terminate due to a
4050 missing .cantunwind annotation. This has been observed to lead to a hang
4051 (denial of service) in some Go applications compiled with gccgo. Reported
4052 by Andreas Schwab. (CVE-2016-6323)
4054 * The DNS stub resolver functions would crash due to a NULL pointer
4055 dereference when processing a query with a valid DNS question type which
4056 was used internally in the implementation. The stub resolver now uses a
4057 question type which is outside the range of valid question type values.
4060 The following bugs are resolved with this release:
4062 [4099] stdio: Overly aggressive caching by stream i/o functions.
4063 [7065] build: Support building glibc with -fstack-protector or -fstack-
4065 [9842] localedata: en_CA: incorrect date format
4066 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4067 before it started waiting
4068 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4069 [15765] nptl: sem_open is wrongly a cancellation point
4070 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4071 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4073 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4074 library linked with pthread
4075 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4076 "FIXME: Ingo" issue)
4077 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4078 [17252] libc: getrandom and getentropy syscall
4079 [17730] malloc: thread-local storage is sometimes improperly free()'d
4080 after being __libc_memalign()'d
4081 [18241] stdio: failed fseek on memstream does not set errno and can fail
4083 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4085 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4086 PTHREAD_PRIO_INHERIT mutex on ARM
4087 [18784] network: res_query and related function crash for special record
4088 type queries (CVE-2015-5180)
4089 [19380] math: strtod does not raise "inexact"
4090 [19387] string: Integer overflow in memchr
4091 [19390] string: Integer overflow in strncat
4092 [19398] build: linknamespace tests fail with massively parallel build
4093 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4095 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4096 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4097 [19514] libc: [PATCH] Fix spelling errors in spelling
4098 "implement"/"implementation" in several places
4099 [19582] network: Deprecate RES_USE_INET6
4100 [19673] manual: clog10 docs appear to be erroneous
4101 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4102 causes a segmentation fault
4103 [19826] libc: invalid pointer returned from __tls_get_addr with static
4105 [20016] network: resolv: Remove hooks support from the API
4106 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4108 [20033] math: [x86_64] vectorized math function don't call the __finite
4110 [20116] nptl: use after free in pthread_create
4111 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4112 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4114 [20311] nptl: please install proc_service.h
4115 [20366] libc: Compilation errors in installed headers in strict-compliance
4117 [20370] malloc: malloc: Arena free list management is still racy
4118 (incorrect fix in bug 19243)
4119 [20386] libc: assert (X = 0) does not result in GCC warning
4120 [20432] malloc: malloc: Minimize interface required for interposition
4121 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4122 in _Unwind_Backtrace (CVE-2016-6323)
4123 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4124 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4126 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4127 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4128 [20477] network: resolv: incorrect double-checked locking related to
4130 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4132 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4134 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4135 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4136 cause transition penalty
4137 [20517] math: sparcv9 missing fdiml compat symbol
4138 [20524] manual: strverscmp is inconsistent
4139 [20525] libc: <sys/quota.h> should be based on kernel headers
4140 [20539] math: GCC 7 -static -lm fails to link at -O3
4141 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4143 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4145 [20591] network: Remove obsolete DNSSEC support
4146 [20592] network: DNS resource record type classification macros in
4147 <arpa/nameser.h> are incorrect
4148 [20593] network: Update DNS RR type definitions
4149 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4150 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4152 [20629] network: libresolv: Remove support for bitstring labels
4154 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4155 assertion: "maxidx >= 2"
4156 [20660] math: [arm] Use VSQRT
4157 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4158 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4159 [20689] libc: Test for FMA should also check for AVX.
4160 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4161 [20715] math: iszero macro breaks existing code
4162 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4163 [20728] libc: powerpc: Missing TOC stub in clone
4164 [20729] build: glibc-2.24 fails to build for i486 with -Os
4165 [20750] build: Build fails with default PIE enabled gcc-6.x
4166 [20768] math: [alpha] sqrt fegetenv namespace
4167 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4169 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4170 __FLT_EVAL_METHOD__ is 2
4171 [20790] network: rpcgen buffer overrun in get_prog_declaration
4172 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4173 [20829] libc: crypt snprintf namespace
4174 [20847] libc: tst-vfork3 failure
4175 [20855] math: Default bits/mathdef.h has inappropriate float_t
4176 [20859] math: [sh4] FP_ILOGB0 invalid
4177 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4178 U+20AC), not same as GBK
4179 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4180 [20916] math: pow handling of sNaN arguments
4181 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4182 [20919] math: Bad pow (qNaN, 0) result with -lieee
4183 [20940] math: hypot sNaN handling
4184 [20947] math: fmax, fmin sNaN handling
4185 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4186 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4188 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4189 [20973] nptl: robust mutexes: Lost wake-ups
4190 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4191 [20978] nis: strlen on null pointer in nss_nisplus
4192 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4194 [21014] string: i686 memchr overflows internal pointer check
4195 [21019] libc: [mips] n32 lseek incorrect on overflow
4196 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4197 [21026] libc: [MIPS] readahead syscall is broken on n64
4198 [21028] math: Fallback fesetexceptflag should always succeed
4199 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4200 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4202 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4203 [21061] librt: [microblaze] librt lost clock_* exports
4204 [21073] libc: tunables: insecure environment variables passed to
4205 subprocesses with AT_SECURE
4206 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4210 * The minimum Linux kernel version that this version of the GNU C Library
4211 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4212 kernel version 2.6.32 or later suffices (on architectures that already
4213 required kernel versions more recent than 3.2, those requirements remain
4214 unchanged). Linux 3.2 or later kernel headers are required on all
4217 * The pap_AN locale has been deleted. This has been deprecated for a long
4218 time. It has been replaced by pap_AW & pap_CW, both of which have long
4219 been included in previous releases.
4221 * The readdir_r and readdir64_r functions have been deprecated. It is
4222 recommended to use readdir and readdir64 instead.
4224 * The type “union wait” has been removed. It was deprecated in the early
4225 1990s and never part of POSIX. Application code should use the int type
4226 instead of “union wait”.
4228 * A new NSS action is added to facilitate large distributed system
4229 administration. The action, MERGE, allows remote user stores like LDAP
4230 to be merged into local user stores like /etc/groups in order to provide
4231 easy to use, updated, and managed sets of merged credentials. The new
4232 action can be used by configuring it in /etc/nsswitch.conf:
4233 group: files [SUCCESS=merge] nis
4234 Implemented by Stephen Gallagher (Red Hat).
4236 * The deprecated __malloc_initialize_hook variable has been removed from the
4239 * The long unused localedef --old-style option has been removed. It hasn't
4240 done anything in over 16 years. Scripts using this option can safely
4243 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4244 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4245 return the next representable value in the direction of positive infinity
4246 and the nextdown functions return the next representable value in the
4247 direction of negative infinity. These are currently enabled as GNU
4250 Security related changes:
4252 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4253 could result in a stack overflow when getnetbyname was called with an
4254 overly long name. (CVE-2016-3075)
4256 * Previously, getaddrinfo copied large amounts of address data to the stack,
4257 even after the fix for CVE-2013-4458 has been applied, potentially
4258 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4259 instead. Reported by Michael Petlan. (CVE-2016-3706)
4261 * The glob function suffered from a stack-based buffer overflow when it was
4262 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4263 Reported by Alexander Cherepanov. (CVE-2016-1234)
4265 * The Sun RPC UDP client could exhaust all available stack space when
4266 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4267 alloca plugin for GCC. (CVE-2016-4429)
4269 * The IPv6 name server management code in libresolv could result in a memory
4270 leak for each thread which is created, performs a failing naming lookup,
4271 and exits. Over time, this could result in a denial of service due to
4272 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4274 The following bugs are resolved with this release:
4276 [1170] localedata: ne_NP: update Nepali locale definition file
4277 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4279 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4280 [6796] math: fdim() does not set errno on overflow
4281 [10354] libc: posix_spawn should use vfork() in more cases than presently
4282 [11213] localedata: localedata: add copyright disclaimer to locale files
4283 [12143] localedata: chr_US: new Cherokee locale
4284 [12450] localedata: sgs_LT: new locale
4285 [12676] localedata: ln_CD: new locale
4286 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4288 [13304] math: fma, fmaf, fmal produce wrong results
4289 [14259] build: --localedir arg to configure is ignored
4290 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4291 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4292 [14934] localedata: es_CL: wrong first weekday chilean locale
4293 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4295 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4297 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4298 [15368] nptl: raise() is not async-signal-safe
4299 [15479] math: ceil, floor, round and trunc raise inexact exception
4300 [15578] localedata: kk_KZ: various updates
4301 [16003] localedata: pap_AN: punt old locale
4302 [16137] localedata: iw_IL: punt old locale
4303 [16190] localedata: eo: new esperanto locale
4304 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4305 [16742] malloc: race condition: pthread_atfork() called before first
4306 malloc() results in unexpected locking behaviour/deadlocks
4307 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4309 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4310 [17565] localedata: pt_PT: wrong (work-)week start
4311 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4312 [17950] build: Build fails with -msse
4313 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4314 [18433] libc: posix_spawn does not return correctly upon failure to
4316 [18453] localedata: charmaps/IBM875: incorrect codes
4317 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4319 [18896] localedata: he_IL: improvements for currency
4320 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4321 Romanian locale data
4322 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4324 [19056] libc: Deprecate readdir_r
4325 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4327 [19198] localedata: nl_NL: small improvements for Dutch locales
4328 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4329 nameservers (CVE-2016-5417)
4330 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4332 [19400] locale: Language missing in "iso-639.def", trivial fix in
4334 [19431] malloc: Deadlock between fflush, getdelim, and fork
4335 [19505] libc: Incorrect file descriptor validity checks in
4336 posix_spawn_file_actions_add{open,close,dup2}
4337 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4338 when using RTLD_NEXT
4339 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4340 `intl/{gettextP,loadinfo}.h'
4341 [19534] libc: execle, execlp may use malloc
4342 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4343 [19573] network: res_nclose and __res_maybe_init disagree about name
4344 server initialization, breaking Hesiod
4345 [19575] localedata: Status of GB18030 tables
4346 [19581] localedata: sr_* date_fmt string contains additional newline
4347 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4349 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4350 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4351 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4352 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4354 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4356 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4358 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4359 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4360 [19633] locale: strfmon_l applies global locale to number formatting
4361 [19642] network: Memory leak in getnameinfo
4362 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4363 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4365 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4366 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4368 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4369 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4371 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4373 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4375 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4376 pointers and lengths in error-case.
4377 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4378 report errors on UTF-16 surrogates values.
4379 [19755] nscd: nscd assertion failure in gc
4380 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4381 [19759] libc: mempcpy shouldn't be inlined
4382 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4383 [19765] libc: s390 needs an optimized mempcpy
4384 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4385 NAME_MAX limit assumption (CVE-2016-1234)
4386 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4387 [19787] network: Missing and incorrect truncation checks in getnameinfo
4388 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4390 [19791] network: Assertion failure in res_query.c with un-connectable name
4392 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4393 [19822] math: libm.so install clobbers old version
4394 [19825] network: resolv: send_vc can return uninitialized data in second
4395 response to getaddrinfo
4396 [19830] network: nss_dns: should check RDATA length against buffer length
4397 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4398 confronted with A/AAAA records of invalid size
4399 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4400 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4401 [19853] stdio: Printing IBM long double in decimal with high precision is
4403 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4404 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4405 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4407 [19865] network: Assertion failure or memory leak in
4408 _nss_dns_getcanonname_r
4409 [19868] network: nss_dns: netent code does not skip over non-PTR records
4410 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4412 [19881] string: Improve x86-64 memset
4413 [19907] string: Incorrect memcpy tests
4414 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4416 [19925] libc: termios.h XCASE namespace
4417 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4418 [19929] libc: limits.h NL_NMAX namespace
4419 [19931] stdio: Memory leak in vfprintf
4420 [19957] libc: clone(CLONE_VM) access invalid parent memory
4421 [19963] localedata: en_IL: New locale
4422 [19989] stdio: stdio.h cuserid namespace
4423 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4425 [19996] locale: langinfo.h nl_langinfo_l namespace
4426 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4427 [20010] network: getaddrinfo: Stack overflow in hostent translation
4429 [20012] stdio: libio: fmemopen append mode failure
4430 [20014] stdio: stdio.h namespace for pre-threads POSIX
4431 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4432 [20023] libc: fcntl.h timespec namespace
4433 [20024] math: [x86_64] vectorized sincos trashes the stack
4434 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4435 [20041] time: sys/time.h timespec namespace
4436 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4437 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4438 [20051] libc: ttyslot in wrong header under wrong conditions
4439 [20054] libc: gethostname not declared for XPG4
4440 [20055] libc: termios.h missing tcgetsid for XPG4
4441 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4443 [20073] libc: sys/stat.h fchmod namespace
4444 [20074] libc: stdlib.h rand_r namespace
4445 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4446 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4448 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4449 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4451 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4452 [20119] libc: Wrong mask for processors level type from CPUID
4453 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4454 AS not supporting AVX512
4455 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4457 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4458 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4460 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4461 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4462 [20178] libc: posix_spawn{p} should not call exit
4463 [20191] stdio: libio: vtables hardening
4464 [20195] string: FMA4 detection requires CPUID execution with register
4466 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4467 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4469 [20212] math: acos (sNaN) returns sNaN
4470 [20213] math: asin (sNaN) returns sNaN
4471 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4472 [20218] math: [i386] asinhl (sNaN) returns sNaN
4473 [20219] math: [i386] atanhl (sNaN) returns sNaN
4474 [20222] stdio: fopencookie: Mangle function pointers
4475 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4476 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4477 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4479 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4480 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4481 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4482 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4483 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4484 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4485 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4486 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4487 [20240] math: modf (sNaN) returns sNaN
4488 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4489 [20250] math: frexp (sNaN) returns sNaN
4490 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4491 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4493 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4494 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4495 subscript is below array bounds [-Werror=array-bounds]
4496 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4497 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4499 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4500 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4502 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4503 "invalid" exceptions
4504 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4505 [20316] localedata: id_ID: Februari instead of Pebruari
4506 [20327] string: POWER8 strcasecmp returns incorrect result
4507 [20347] math: Failure: Test: j0_downward (0xap+0)
4508 [20348] libc: FAIL: misc/tst-preadvwritev64
4509 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4510 [20350] libc: There is no test for p{read,write}64
4511 [20357] math: Incorrect cos result for 1.5174239687223976
4512 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4516 * Unicode 8.0.0 Support: Character encoding, character type info, and
4517 transliteration tables are all updated to Unicode 8.0.0, using new
4518 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4519 These updates cause user visible changes, such as the fixes for bugs
4520 89, 16061, and 18568.
4522 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4523 kernel-internal CPU set size. This means that requests that change the
4524 CPU affinity which failed before (for example, an all-ones CPU mask) will
4525 now succeed. Applications that need to determine the effective CPU
4526 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4527 setting it because the kernel can adjust it (and the previous size check
4528 would not detect this in the majority of cases).
4530 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4531 the following new symbols are used: fts64_children, fts64_close,
4532 fts64_open, fts64_read and fts64_set.
4534 * getaddrinfo now detects certain invalid responses on an internal netlink
4535 socket. If such responses are received, an affected process will
4536 terminate with an error message of "Unexpected error <number> on netlink
4537 descriptor <number>" or "Unexpected netlink response of size <number> on
4538 descriptor <number>". The most likely cause for these errors is a
4539 multi-threaded application which erroneously closes and reuses the netlink
4540 file descriptor while it is used by getaddrinfo.
4542 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4543 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4544 unnecessary serialization of memory allocation requests across threads.
4545 The defect is now corrected. Users should see a substantial increase in
4546 the concurrent throughput of allocation requests for applications which
4547 trigger this bug. Affected applications typically create and
4548 destroy threads frequently. (Bug 19048 was reported and analyzed by
4551 * There is now a --disable-timezone-tools configure option for disabling the
4552 building and installing of the timezone related utilities (zic, zdump, and
4553 tzselect). This is useful for people who build the timezone data and code
4554 independent of the GNU C Library.
4556 * The obsolete header <regexp.h> has been removed. Programs that require
4557 this header must be updated to use <regex.h> instead.
4559 * The obsolete functions bdflush, create_module, get_kernel_syms,
4560 query_module and uselib are no longer available to newly linked binaries;
4561 the header <sys/kdaemon.h> has been removed. These functions and header
4562 were specific to systems using the Linux kernel and could not usefully be
4563 used with the GNU C Library on systems with version 2.6 or later of the
4566 * Optimized string, wcsmbs and memory functions for IBM z13.
4567 Implemented by Stefan Liebler.
4569 * Newly linked programs that define a variable called signgam will no longer
4570 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4571 require signgam to be set by those functions must ensure that they use the
4572 variable provided by the GNU C Library and declared in <math.h>, without
4573 defining their own copy.
4575 * The minimum GCC version that can be used to build this version of the GNU
4576 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4577 still be used to compile programs using the GNU C Library.
4579 Security related changes:
4581 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4582 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4584 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4585 the pointer guard feature. It is always enabled. Previously,
4586 LD_POINTER_GUARD could be used to disable security hardening in binaries
4587 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4590 * An integer overflow in hcreate and hcreate_r could lead to an
4591 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4593 * The catopen function no longer has unbounded stack usage. Reported by
4594 Max. (CVE-2015-8779)
4596 * The nan, nanf and nanl functions no longer have unbounded stack usage
4597 depending on the length of the string passed as an argument to the
4598 functions. Reported by Joseph Myers. (CVE-2014-9761)
4600 * A stack-based buffer overflow was found in libresolv when invoked from
4601 libnss_dns, allowing specially crafted DNS responses to seize control
4602 of execution flow in the DNS client. The buffer overflow occurs in
4603 the functions send_dg (send datagram) and send_vc (send TCP) for the
4604 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4605 family. The use of AF_UNSPEC triggers the low-level resolver code to
4606 send out two parallel queries for A and AAAA. A mismanagement of the
4607 buffers used for those queries could result in the response of a query
4608 writing beyond the alloca allocated buffer created by
4609 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4610 the overflow. Thanks to the Google Security Team and Red Hat for
4611 reporting the security impact of this issue, and Robert Holiday of
4612 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4614 The following bugs are resolved with this release:
4616 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4617 [887] math: Math library function "logb" and "nextafter" inconsistent
4618 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4619 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4620 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4621 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4623 [4404] localedata: German translation of "Alarm clock" is misleading
4624 [6799] math: nextafter() and nexttoward() doesn't set errno on
4625 overflow/underflow errors
4626 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4628 [10432] nis: _nss_nis_setnetgrent assertion failure
4629 [11460] libc: fts has no LFS support
4630 [12926] network: getaddrinfo()/make_request() may spin forever
4631 [13065] nptl: Race condition in pthread barriers
4632 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4633 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4635 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4636 [14912] libc: Rename non-installed bits/*.h headers
4637 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4638 [15367] math: Let gcc use __builtin_isinf
4639 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4640 [15421] math: lgamma wrongly sets signgam for ISO C
4641 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4642 FE_INVALID with argument out of range
4643 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4645 [15786] dynamic-link: ifunc resolver functions can smash function
4647 [15918] math: Unnecessary check for equality in hypotf()
4648 [16061] localedata: Review / update transliteration data
4649 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4651 [16141] time: strptime %z offset restriction
4652 [16171] math: drem should be alias of remainder
4653 [16296] math: fegetround is pure?
4654 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4655 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4657 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4658 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4660 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4661 "Exception "Inexact" set" on ppc32
4662 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4663 [16517] math: Missing underflow exception from tanf/tan/tanl
4664 [16519] math: Missing underflow exception from sinhf
4665 [16520] math: Missing underflow exception from tanhf
4666 [16521] math: Missing underflow exception from exp2
4667 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4669 [16734] stdio: fopen calls mmap to allocate its buffer
4670 [16961] math: nan function incorrect handling of bad sequences
4671 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4672 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4673 [16985] locale: localedef: confusing error message when opening output
4675 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4676 [17197] locale: Redundant shift character in iconv conversion output at
4678 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4679 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4680 [17250] dynamic-link: static linking breaks nss loading
4681 (getaddrinfo/getpwnam/etc...)
4682 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4684 [17441] math: isnan() should use __builtin_isnan() in GCC
4685 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4686 (related to lock elision)
4687 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4688 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4689 [17887] time: strptime should be able to parse "+01:00" style timezones
4690 [17905] libc: catopen() Multiple unbounded stack allocations
4692 [18084] libc: backtrace (..., 0) dumps core on x86
4693 [18086] libc: nice() sets errno to 0 on success
4694 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4695 is too large (CVE-2015-8778)
4696 [18251] dynamic-link: SONAME missing when audit modules provides path
4697 [18265] libc: add attributes for wchar string and memory functions
4698 [18370] math: csqrt missing underflows
4699 [18421] libc: [hppa] read-only segment has dynamic relocations
4700 [18472] libc: Obsolete syscall wrappers should be compat symbols
4701 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4702 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4703 [18525] localedata: Remove locale timezone information
4704 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4705 [18568] localedata: Update locale data to Unicode 8.0
4706 [18589] locale: sort-test.sh fails at random
4707 [18595] math: ctan, ctanh missing underflows
4708 [18604] libc: assert macro-expands its argument
4709 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4710 contains a vector instruction exception.
4711 [18611] math: j1, jn missing errno setting on underflow
4712 [18618] localedata: sync Chechen locale definitions with other *_RU
4714 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4715 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4716 [18665] network: In send_dg, the recvfrom function is NOT always using the
4717 buffer size of a newly created buffer (CVE-2015-7547)
4718 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4720 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4722 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4723 [18699] math: tilegx cproj() for various complex infinities does not yield
4725 [18724] libc: Harden put*ent functions against data injection
4726 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4727 [18755] build: build errors with -DNDEBUG
4728 [18757] stdio: fmemopen fails to set errno on failure
4729 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4731 [18781] libc: openat64 lacks O_LARGEFILE
4732 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4733 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4734 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4735 [18790] math: [ldbl-128ibm] tanhl inaccurate
4736 [18795] libc: stpncpy fortification misses buffer lengths that are
4737 statically too large
4738 [18796] build: build fails for --disable-mathvec
4739 [18803] math: hypot missing underflows
4740 [18820] stdio: fmemopen may leak memory on failure
4741 [18823] math: csqrt spurious underflows
4742 [18824] math: fma spurious underflows
4743 [18825] math: pow missing underflows
4744 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4745 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4746 [18870] build: sem_open.c fails to compile with missing symbol
4748 [18872] stdio: Fix memory leak in printf_positional
4749 [18873] libc: posix_fallocate overflow check ineffective
4750 [18875] math: Excess precision leads incorrect libm
4751 [18877] libc: arm: mmap offset regression
4752 [18887] libc: memory corruption when using getmntent on blank lines
4753 [18918] localedata: hu_HU: change time to HH:MM:SS format
4754 [18921] libc: Regression: extraneous stat() and fstat() performed by
4756 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4757 binaries (CVE-2015-8777)
4758 [18951] math: tgamma missing underflows
4759 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4761 [18953] localedata: lt_LT: change currency symbol to the euro
4762 [18956] math: powf inaccuracy
4763 [18961] math: [i386] exp missing underflows
4764 [18966] math: [i386] exp10 missing underflows
4765 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4766 [18969] build: multiple string test failures due to missing locale
4768 [18970] libc: Reference of pthread_setcancelstate in libc.a
4769 [18977] math: float / long double Bessel functions not in XSI POSIX
4770 [18980] math: i386 libm functions return with excess range and precision
4771 [18981] math: i386 scalb*, ldexp return with excess range and precision
4772 [18982] stdio: va_list and vprintf
4773 [18985] time: Passing out of range data to strftime() causes a segfault
4775 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4776 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4777 [19012] locale: iconv_open leaks memory on error path
4778 [19016] math: clog, clog10 inaccuracy
4779 [19018] nptl: Mangle function pointers in tls_dtor_list
4780 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4781 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4782 [19048] malloc: malloc: arena free list can become cyclic, increasing
4784 [19049] math: [powerpc] erfc incorrect zero sign
4785 [19050] math: [powerpc] log* incorrect zero sign
4786 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4787 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4788 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4789 [19074] network: Data race in _res_hconf_reorder_addrs
4790 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4791 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4792 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4794 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4796 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4797 [19086] manual: posix_fallocate64 documented argument order is wrong.
4798 [19088] math: lround, llround missing exceptions close to overflow
4800 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4801 [19095] math: dbl-64 lrint incorrect for 64-bit long
4802 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4803 [19124] dynamic-link: ld.so failed to build with older assembler
4804 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4805 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4806 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4807 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4808 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4809 pthread_setaffinity_np
4810 [19156] math: [ldbl-128] j0l spurious underflows
4811 [19164] nptl: tst-getcpu fails with many possible CPUs
4812 [19168] math: math/test-ildoubl and math/test-ldouble failure
4813 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4814 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4816 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4817 (FE_NOMASK_ENV) do not clear SSE exceptions
4818 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4819 _int_new_arena/reused_arena
4820 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4821 [19201] math: dbl-64 remainder incorrect sign of zero result
4822 [19205] math: bits/math-finite.h conditions do not match math.h and
4824 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4825 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4826 for C99-based standards
4827 [19212] libc: features.h not -Wundef clean
4828 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4830 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4831 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4832 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4834 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4835 "inexact" exceptions
4836 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4838 [19242] libc: strtol incorrect in Turkish locales
4839 [19243] malloc: reused_arena can pick an arena on the free list, leading
4840 to an assertion failure and reference count corruption
4841 [19253] time: tzset() ineffective when temporary TZ did not include DST
4843 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4844 [19270] math: [hppa] Shared libm missing __isnanl
4845 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4846 MAP_HUGETLB and MAP_STACK defines
4847 [19313] nptl: Wrong __cpu_mask for x32
4848 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4849 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4850 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4851 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4852 [19363] time: x32: times() return value wrongly truncates/sign extends
4854 [19367] dynamic-link: Improve branch prediction on Silvermont
4855 [19369] network: Default domain name not reset by res_ninit when "search"
4856 / "domain" entry is removed from resolv.conf
4857 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4859 [19385] localedata: bg_BG: time separator should be colon, not comma
4860 [19408] libc: linux personality syscall wrapper may erroneously return an
4861 error on 32-bit architectures
4862 [19415] libc: dladdr returns wrong names on hppa
4863 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4864 IBM905, IBM907, and IBM909
4865 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4866 [19443] build: build failures with -DDEBUG
4867 [19451] build: Make check fails on test-double-vlen2
4868 [19462] libc: Glibc failed to build with -Os
4869 [19465] math: Wrong code with -Os
4870 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4872 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4874 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4875 [19486] math: S390: Math tests fail with "Exception Inexact set".
4876 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4877 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4879 [19590] math: Fail to build shared objects that use libmvec.so functions.
4883 * The following bugs are resolved with this release:
4885 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4886 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4887 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4888 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4889 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4890 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4891 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4892 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4893 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4894 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4895 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4896 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4897 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4898 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4899 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4900 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4901 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4902 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4903 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4904 18657, 18676, 18694, 18696, 18887.
4906 * Cache information can be queried via sysconf() function on s390 e.g. with
4907 _SC_LEVEL1_ICACHE_SIZE as argument.
4909 * A buffer overflow in gethostbyname_r and related functions performing DNS
4910 requests has been fixed. If the NSS functions were called with a
4911 misaligned buffer, the buffer length change due to pointer alignment was
4912 not taken into account. This could result in application crashes or,
4913 potentially arbitrary code execution, using crafted, but syntactically
4914 valid DNS responses. (CVE-2015-1781)
4916 * The time zone file parser has been made more robust against crafted time
4917 zone files, avoiding heap buffer overflows related to the processing of
4918 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4919 large time zone data files. Overly long time zone specifiers in the TZ
4920 variable no longer result in stack overflows and crashes.
4922 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4923 for LD and GD on x86 and x86-64, has been implemented. You will need
4924 binutils-2.24 or later to enable this optimization.
4926 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4927 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4928 Hat). These updates cause user visible changes, such as the fix for bug
4931 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4932 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4933 condition in some applications.
4935 * Added vector math library named libmvec with the following vectorized x86_64
4936 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4938 The library can be disabled with --disable-mathvec. Use of the functions is
4939 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4940 Shared library libmvec.so is linked in as needed when using -lm (no need to
4941 specify -lmvec explicitly for not static builds).
4942 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4944 * A new fmemopen implementation has been added with the goal of POSIX
4945 compliance. The new implementation fixes the following long-standing
4946 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4947 old implementation is still present for use be by existing binaries.
4949 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4950 releases. It has been fixed to match 2.19 and older, but binaries built
4951 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4953 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4954 Contributed by Roland McGrath (Google).
4956 * The header <regexp.h> is deprecated, and will be removed in a future
4957 release. Use of this header will trigger a deprecation warning.
4958 Application developers should update their code to use <regex.h> instead.
4960 This header was formerly part of SUS, but was deprecated in 1994 and
4961 removed from the standard in 2001. Also, the glibc implementation
4962 leaks memory. See BZ#18681 for more details.
4966 * The following bugs are resolved with this release:
4968 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4969 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4970 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4971 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4972 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4973 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4974 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4975 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4976 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4977 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4980 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4981 too little memory for the to-be-scanned arguments and overflow the
4982 allocated buffer. The implementation now correctly computes the required
4983 buffer size when using malloc, and switches to malloc from alloca as
4986 * A new semaphore algorithm has been implemented in generic C code for all
4987 machines. Previous custom assembly implementations of semaphore were
4988 difficult to reason about or ensure that they were safe. The new version
4989 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4990 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4991 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4993 * Port to Altera Nios II has been contributed by Mentor Graphics.
4995 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4996 implementations for powerpc64/powerpc64le.
4997 Implemented by Adhemerval Zanella (IBM).
4999 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
5000 and powerpc64le. This may improve lock scaling of existing programs on
5001 HTM capable systems. The lock elision code is only enabled with
5002 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
5003 powerpc will issue a transaction abort on every syscall to avoid side
5004 effects being visible outside transactions.
5006 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
5007 AArch64. Contributed by ARM Ltd.
5009 * i386 memcpy functions optimized with SSE2 unaligned load/store.
5011 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
5012 under certain input conditions resulting in the execution of a shell for
5013 command substitution when the application did not request it. The
5014 implementation now checks WRDE_NOCMD immediately before executing the
5015 shell and returns the error WRDE_CMDSUB as expected.
5017 * CVE-2012-3406 printf-style functions could run into a stack overflow when
5018 processing format strings with a large number of format specifiers.
5020 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
5021 infinite loop if the DNS response contained a PTR record of an unexpected
5024 * The minimum GCC version that can be used to build this version of the GNU
5025 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
5026 still be used to compile programs using the GNU C Library.
5028 * The GNU C Library is now built with -Werror by default. This can be
5029 disabled by configuring with --disable-werror.
5031 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
5033 * The obsolete sigvec function has been removed. This was the original
5034 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
5035 programs have been using instead for about 25 years. Of course, ABI
5036 compatibility for old binaries using sigvec remains intact.
5038 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5039 with newer versions of bison.
5041 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5042 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5043 registers overlay two consecutive single-precision registers. MIPS32R2
5044 introduced a new FPU mode (FR=1) where double-precision registers extend the
5045 corresponding single-precision registers which is incompatible with the
5046 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5047 require the use of FR=1 making a transition necessary. New o32 ABI
5048 extensions enable users to migrate over time from the original o32 ABI
5049 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5050 tracks the ABI of any loaded object and verifies that new objects are
5051 compatible. Mode transitions will also be requested as required and
5052 unsupportable objects will be rejected. The ABI checks include both soft and
5053 hard float ABIs for o32, n32 and n64.
5055 GCC 5 with GNU binutils 2.25 onwards:
5056 It is strongly recommended that all o32 system libraries are built using the
5057 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5058 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5059 compiler using --with-fp-32=xx to set this by default.
5063 * The following bugs are resolved with this release:
5065 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5066 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5067 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5068 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5069 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5070 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5071 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5072 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5073 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5074 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5075 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5076 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5077 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5078 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5079 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5081 * Reverted change of ABI data structures for s390 and s390x:
5082 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5083 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5084 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5085 are preserved pointing straight to the same implementation as the old ones.
5086 Given that, new callers will simply provide a too-big buffer to these
5087 functions. Any applications/libraries out there that embed jmp_buf or
5088 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5089 against 2.19 headers will have to rebuilt again. This is necessary in any
5090 case to revert the breakage in their ABI caused by the glibc change.
5092 * Support for file description locks is added to systems running the
5093 Linux kernel. The standard file locking interfaces are extended to
5094 operate on file descriptions, not file descriptors, via the use of
5095 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5096 are associated with an open file instead of a process.
5098 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5100 * The minimum Linux kernel version that this version of the GNU C Library
5101 can be used with is 2.6.32.
5103 * Running the testsuite no longer terminates as soon as a test fails.
5104 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5105 with PASS or FAIL lines for individual tests. A summary of the results is
5106 printed, including a list of failing lists, and "make check" exits with
5107 error status if there were any unexpected failures. "make check
5108 stop-on-test-failure=y" may be used to keep the old behavior.
5110 * The am33 port, which had not worked for several years, has been removed
5113 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5114 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5115 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5116 conflicted with POSIX (support for which was removed in 2.19), the
5117 interfaces those macros enabled remain available when compiling with
5118 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5119 test macros defined.
5121 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5123 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5124 This may improve lock scaling of existing programs on TX capable systems.
5125 The lock elision code is only built with --enable-lock-elision=yes and
5126 then requires a GCC version supporting the TX builtins. With lock elision
5127 default mutexes are elided via __builtin_tbegin, if the cpu supports
5128 transactions. By default lock elision is not enabled and the elision code
5131 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5132 copy the path argument. This allowed programs to cause posix_spawn to
5133 deference a dangling pointer, or use an unexpected pathname argument if
5134 the string was modified after the posix_spawn_file_actions_addopen
5137 * All supported architectures now use the main glibc sysdeps directory
5138 instead of some being in a separate "ports" directory (which was
5139 distributed separately before glibc 2.17).
5141 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5142 On configurations that support it (all Linux configurations), it's now
5143 used regardless of the --enable-add-ons switch to configure. It is no
5144 longer possible to build such configurations without pthreads support.
5146 * Locale names, including those obtained from environment variables (LANG
5147 and the LC_* variables), are more tightly checked for proper syntax.
5148 setlocale will now fail (with EINVAL) for locale names that are overly
5149 long, contain slashes without starting with a slash, or contain ".." path
5150 components. (CVE-2014-0475) Previously, some valid locale names were
5151 silently replaced with the "C" locale when running in AT_SECURE mode
5152 (e.g., in a SUID program). This is no longer necessary because of the
5155 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5156 with application code using Intel MPX instructions. (With all previous
5157 versions, the MPX register state could be clobbered when making calls
5158 into or out of a shared library.) Note that while the new dynamic
5159 linker is compatible with all known x86 hardware whether or not it
5160 supports Intel MPX, some x86 instruction-set emulators might fail to
5161 handle the new instruction encodings. This is known to affect Valgrind
5162 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5163 release), and might affect other tools that do instruction emulation.
5165 * Support for loadable gconv transliteration modules has been removed.
5166 The support for transliteration modules has been non-functional for
5167 over a decade, and the removal is prompted by security defects. The
5168 normal gconv conversion modules are still supported. Transliteration
5169 with //TRANSLIT is still possible, and the //IGNORE specifier
5170 continues to be supported. (CVE-2014-5119)
5172 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5173 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5174 resulting a denial-of-service security vulnerability in applications which
5175 use functions related to iconv. (CVE-2014-6040)
5179 * The following bugs are resolved with this release:
5181 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5182 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5183 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5184 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5185 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5186 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5187 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5188 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5189 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5190 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5191 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5192 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5193 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5194 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5195 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5196 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5197 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5198 16431, 16453, 16474, 16506, 16510, 16529
5200 * Slovenian translations for glibc messages have been contributed by the
5201 Translation Project's Slovenian team of translators.
5203 * The public headers no longer use __unused nor __block. This change is to
5204 support compiling programs that are derived from BSD sources and use
5205 __unused internally, and to support compiling with Clang's -fblock
5206 extension which uses __block.
5208 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5209 large collation sequences to optimize multiple passes. This cache
5210 computation may overflow for large collation sequences and may cause a
5211 stack or buffer overflow. This is now fixed to use a slower algorithm
5212 which does not use a cache if there is an integer overflow.
5214 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5215 rules for large collation sequences to optimize multiple passes and falls
5216 back to alloca if malloc fails, resulting in a possible stack overflow.
5217 The implementation now falls back to an uncached collation sequence lookup
5220 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5221 initialized for static applications resulting in the security feature
5222 being disabled. The pointer guard is now correctly initialized to a
5223 random value for static applications. Existing static applications need
5224 to be recompiled to take advantage of the fix (bug 15754).
5226 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5227 to the d_name member of struct dirent, or omit the terminating NUL
5228 character. (Bugzilla #14699).
5230 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5231 aligned_alloc functions could allocate too few bytes or corrupt the
5232 heap when passed very large allocation size values (Bugzilla #15855,
5235 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5236 for AF_INET6 has been fixed (Bugzilla #16072).
5238 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5239 pap_CW, quz_PE, the_NP.
5241 * Substantially revised locales: gd_GB, ht_HT
5243 * The LC_ADDRESS field was updated to support country_car for almost all
5246 * ISO 1427 definitions were updated.
5248 * ISO 3166 definitions were updated.
5250 * The localedef utility now supports --big-endian and --little-endian
5251 command-line options to generate locales for a different system from that
5252 for which the C library was built.
5254 * Binary locale files now only depend on the endianness of the system for
5255 which they are generated and not on other properties of that system. As a
5256 consequence, binary files generated with new localedef may be incompatible
5257 with old versions of the GNU C Library, and binary files generated with
5258 old localedef may be incompatible with this version of the GNU C Library,
5259 in the following circumstances:
5261 + Locale files may be incompatible on m68k systems.
5263 + Locale archive files (but not separate files for individual locales) may
5264 be incompatible on systems where plain "char" is signed.
5266 * The configure option --disable-versioning has been removed. Builds with
5267 --disable-versioning had not worked for several years.
5269 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5270 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5272 * SystemTap probes for malloc have been introduced.
5274 * SystemTap probes for slow multiple precision fallback paths of
5275 transcendental functions have been introduced.
5277 * Support for powerpc64le has been added.
5279 * The soft-float powerpc port now supports e500 processors.
5281 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5283 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5284 set of header declarations that are enabled by default, even when other
5285 feature test macros or compiler options such as -std=c99 would otherwise
5286 disable some of those declarations.
5288 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5289 conflict with POSIX. The libbsd-compat library (which was a dummy library
5290 that did nothing) has also been removed.
5292 * Preliminary documentation about Multi-Thread, Async-Signal and
5293 Async-Cancel Safety has been added.
5295 * Change of ABI data structures for s390 and s390x:
5296 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5297 allow for future hardware extensions. All library functions that accept or
5298 return these structures were versioned in order to provide backwards
5299 compatibility with existing code. However, not all cases can be handled
5300 with interface versioning. If an application embeds either structure into
5301 another structure and that structure is passed to another compilation unit
5302 which expects the newer larger-sized object then any access to the new
5303 fields will result in undefined behaviour. Similarly any access to fields
5304 that were moved by the enlarging of the structures will cause undefined
5305 behaviour. To fix the undefined behaviour all objects that are part of the
5306 final in-memory image must agree on the size of structures, and this may
5307 require recompilation.
5311 * The following bugs are resolved with this release:
5313 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5314 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5315 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5316 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5317 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5318 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5319 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5320 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5321 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5322 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5323 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5324 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5325 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5328 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5329 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5330 Distributions can re-enable building and using pt_chown via the new configure
5331 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5332 considerable security risks and should only be used if the distribution
5333 understands and accepts the risks.
5335 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5338 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5339 fixed (Bugzilla #15330).
5341 * Add support for calling C++11 thread_local object destructors on thread
5342 and program exit. This needs compiler support for offloading C++11
5343 destructor calls to glibc.
5345 * Improved worst case performance of libm functions with double inputs and
5348 * Support for priority inherited mutexes in pthread condition variables on
5349 non-x86 architectures.
5351 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5353 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5355 * Optimized string functions for ARM. Implemented by Will Newton and
5358 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5360 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5363 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5364 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5366 * Added a benchmark framework to track performance of functions in glibc.
5368 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5369 It is based on draft TS 18661 and currently enabled as a GNU extension.
5371 * On Linux, the clock function now uses the clock_gettime system call
5372 for improved precision, rather than old times system call.
5374 * Added support for version-3 tz format files. This is needed when using
5375 the tz database release 2013e or later, and affects a few unusual cases --
5376 currently only TZ='America/Godthab' for time stamps after 2037.
5378 * Added new API functions pthread_getattr_default_np and
5379 pthread_setattr_default_np to get and set the default pthread
5380 attributes of a process.
5382 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5383 This may improve lock scaling of existing programs on TSX capable systems.
5384 When the --enable-lock-elision=yes parameter is specified at configure
5385 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5388 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5389 availability). Implemented by Ryan S. Arnold.
5391 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5395 * The following bugs are resolved with this release:
5397 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5398 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5399 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5400 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5401 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5402 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5403 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5404 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5405 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5406 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5407 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5408 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5409 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5410 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5411 14879, 14889, 14893, 14898, 14914.
5413 * Optimization of memcpy for MIPS.
5415 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5416 EMFILE has been fixed (Bugzilla #14889).
5418 * The add-on ports collection is now distributed in the "ports" subdirectory
5419 of the main GNU C Library distribution, rather than separately.
5421 * Port to ARM AArch64 contributed by Linaro.
5423 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5424 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5426 Implemented by Andreas Krebbel.
5428 * The new function secure_getenv allows secure access to the environment,
5429 returning NULL if running in a SUID/SGID process. This function replaces
5430 the internal function __secure_getenv.
5432 * SystemTap static probes have been added into the dynamic linker.
5433 Implemented by Gary Benson.
5435 * Optimizations of string functions strstr, strcasestr and memmem.
5436 Implemented by Maxim Kuvyrkov.
5438 * The minimum Linux kernel version that this version of the GNU C Library
5439 can be used with is 2.6.16.
5441 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5442 powerpc POWER7. Implemented by Will Schmidt.
5444 * New configure option --disable-nscd builds the C library such that it
5445 never attempts to contact the Name Service Caching Daemon (nscd).
5446 New configure option --disable-build-nscd avoids building nscd itself;
5447 this is the default if --disable-nscd is used.
5449 * Improved support for cross-compilation, including cross-testing and
5450 bootstrap builds without a previously built glibc.
5452 * Several testsuite tests are now able to test multiple IFUNC variants of an
5453 interface, rather than just testing the one that would be chooen by
5456 * New configure options --with-bugurl and --with-pkgversion, for
5457 distributors to use to embed their bug-reporting and package version
5458 information in --help and --version output.
5460 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5461 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5462 allows creation of chroots without the procfs mounted on /proc.
5464 * The `crypt' function now fails if passed salt bytes that violate the
5465 specification for those values. On Linux, the `crypt' function will
5466 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5467 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5468 when the mode is enabled.
5470 * The `clock_*' suite of functions (declared in <time.h>) is now available
5471 directly in the main C library. Previously it was necessary to link with
5472 -lrt to use these functions. This change has the effect that a
5473 single-threaded program that uses a function such as `clock_gettime' (and
5474 is not linked with -lrt) will no longer implicitly load the pthreads
5475 library at runtime and so will not suffer the overheads associated with
5476 multi-thread support in other code such as the C++ runtime library.
5478 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5483 * The following bugs are resolved with this release:
5485 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5486 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5487 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5488 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5489 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5490 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5491 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5492 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5493 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5494 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5495 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5496 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5497 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5498 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5499 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5500 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5501 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5502 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5503 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5504 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5505 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5506 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5509 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5510 configuring glibc with:
5511 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5512 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5513 Implemented by H.J. Lu.
5517 + define static_assert
5519 + do not declare gets
5521 + declare at_quick_exit and quick_exit also for ISO C11
5523 + aligned_alloc. NB: The code is deliberately allows the size parameter
5524 to not be a multiple of the alignment. This is a moronic requirement
5525 in the standard but it is only a requirement on the caller, not the
5528 + timespec_get added
5530 + uchar.h support added
5532 + CMPLX, CMPLXF, CMPLXL added
5534 Implemented by Ulrich Drepper.
5536 * Support for the IA-64 has been moved to ports.
5538 * Remove support for anything but ELF binary format
5540 * Checking versions of poll, ppoll added.
5541 Implemented by Ulrich Drepper.
5543 * More generic and 64-bit performance optimizations to math functions.
5544 Implemented by Ulrich Drepper.
5546 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5547 headers and functions available at compile time as they were before
5548 version 2.14. This option will be removed at some time in the future
5549 after the TI-RPC library becomes fully sufficient for the needs of
5550 existing applications.
5552 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5553 Note that glibc is not expected to work with any Linux kernel version
5556 * New header <sys/auxv.h> and function getauxval allowing easy access to
5557 the AT_* key-value pairs passed from the Linux kernel. The header also
5558 defines the HWCAP_* bits associated with the AT_HWCAP key.
5560 * New locales: mag_IN
5562 * New configure option --enable-systemtap builds SystemTap static probes
5563 into libc for setjmp and longjmp and into libpthread for various operations.
5564 So far the setjmp/longjmp probes and some of the libpthread probes are
5565 provided only for i*86 and x86_64.
5566 Implemented by Roland McGrath and Rayson Ho.
5568 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5570 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5573 * More optimized functions for SPARC. Implemented by David S. Miller.
5575 * Improved support for cross-compilation, especially bootstrap builds
5576 without a previously built glibc.
5578 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5579 Chris Metcalf from Tilera.
5581 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5582 now supported for ARM processors.
5584 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5585 as the name of the dynamic linker, to distinguish it from the
5586 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5588 * Support for CRIS has been removed from ports.
5590 * A new class of installed header has been documented for low-level
5591 platform-specific functionality. PowerPC added the first instance with a
5592 function to provide time base register access. Contributed by Tulio
5593 Magno Quites Machado Filho.
5595 * ix86 configurations now install header files that are consistent with
5596 what x86-64 configurations install. These same header files can be used
5597 for -m32, -m64, or -mx32 builds.
5598 Contributed by H.J. Lu.
5600 * Math library bug fixes. A thorough audit of all open math library bugs was
5601 conducted by Joseph Myers. Significant progress was made on many math
5602 library bugs resulting in more accurate exceptions and function results.
5603 Many thanks to all those that contributed including Andreas Jaeger for his
5604 patch review and work on the x87 trigonometric instruction issues.
5606 * Timezone data is no longer installed. Timezone-related binaries and scripts
5607 will continue to be installed. Users should obtain their timezone data from
5608 their distribution provider or from the tzdata package at
5609 <ftp://munnari.oz.au/pub/>.
5613 * The following bugs are resolved with this release:
5615 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5616 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5617 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5618 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5619 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5620 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5621 13484, 13506, 13515, 13523, 13524, 13538, 13540
5623 * New program pldd to list loaded object of a process
5624 Implemented by Ulrich Drepper.
5626 * Add nss_db support back to glibc. No more dependency on Berkeley db
5627 and support for initgroups lookups.
5628 Implemented by Ulrich Drepper.
5630 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5631 Contributed by HJ Lu.
5633 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5634 Contributed by HJ Lu.
5636 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5637 on x86-32 and x86-64.
5638 Contributed by Liubov Dmitrieva.
5640 * Optimized strchr and strrchr for SSE on x86-32.
5641 Contributed by Liubov Dmitrieva.
5643 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5644 for x86-64 and x86-32.
5645 Contributed by Liubov Dmitrieva.
5647 * New interfaces: scandirat, scandirat64
5648 Implemented by Ulrich Drepper.
5650 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5651 Implemented by Ulrich Drepper.
5653 * nscd now also caches the netgroup database.
5654 Implemented by Ulrich Drepper.
5656 * Integrate libm with gcc's -ffinite-math-only option.
5657 Implemented by Ulrich Drepper.
5659 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5660 to math functions. Implemented by Ulrich Drepper.
5662 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5663 Implemented by Ulrich Drepper.
5665 * New Linux interfaces: process_vm_readv, process_vm_writev
5667 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5668 Implemented by Ulrich Drepper.
5670 * Optimized nearbyint and strcasecmp for PPC.
5671 Implemented by Adhemerval Zanella.
5673 * New locales: bho_IN, unm_US, es_CU, ta_LK
5677 * The following bugs are resolved with this release:
5679 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5680 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5681 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5682 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5683 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5684 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5685 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5686 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5687 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5688 12795, 12811, 12813, 12814, 12841
5690 * The RPC implementation in libc is obsoleted. Old programs keep working
5691 but new programs cannot be linked with the routines in libc anymore.
5692 Programs in need of RPC functionality must be linked against TI-RPC.
5693 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5695 Visible changes of this change include (obviously) the inability to link
5696 programs using RPC functions without referencing the TI-RPC library and the
5697 removal of the RPC headers from the glibc headers.
5698 Implemented by Ulrich Drepper.
5700 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5701 syncfs, setns, sendmmsg
5703 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5704 yue_HK, lij_IT, mhr_RU
5706 * New encodings: CP770, CP771, CP772, CP773, CP774
5708 * New program sotruss to trace calls through PLTs
5709 Implemented by Ulrich Drepper.
5711 * The malloc hook implementation is marked deprecated and will be removed
5712 from the default implementation in the next version. The design never
5713 worked ever since the introduction of threads. Even programs which do
5714 not create threads themselves can use multiple threads created internally.
5718 * The following bugs are resolved with this release:
5720 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5721 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5722 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5723 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5726 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5728 * POWER7 optimizations: memset, memcmp, strncmp
5730 * New optimized string functions for x86-64: strnlen (SSE2),
5731 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5732 Implemented by Ulrich Drepper.
5736 * The following bugs are resolved with this release:
5738 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5739 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5740 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5741 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5742 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5743 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5744 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5745 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5747 * New interfaces: pthread_getname_np, pthread_setname_np
5749 * New Linux interface: recvmmsg
5751 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5753 * The dynamic linker now recognizes supported ABI versions from the
5754 EI_ABIVERSION field in the ELF header.
5755 Implemented by Ulrich Drepper.
5757 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5758 will not be used to fill in password fields in the passwd.byname replies.
5759 Instead it is used to synthesize the shadow.byname table, should it be
5760 missing. This is a useful mode in some installations involving Solaris.
5761 Implemented by Ulrich Drepper.
5763 * New locales: kok_IN, sq_MK, cv_RU
5767 * The following bugs are resolved with this release:
5769 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5770 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5771 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5772 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5773 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5774 10789, 10817, 10823, 10840, 10847
5776 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5778 Implemented by Ulrich Drepper.
5780 * Checking version of longjmp added that fails if an uninitialized stack
5781 frame would be created. Implemented by Ulrich Drepper.
5783 * STT_GNU_IFUNC is now supported in static executables.
5784 Implemented by H.J. Lu.
5786 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5788 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5789 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5790 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5791 Contributed by H.J. Lu.
5793 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5794 Implemented by Ulrich Drepper.
5796 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5798 Contributed by H.J. Lu.
5800 * Support for fma instruction in AVX on x86-64.
5801 Implemented by H.J. Lu and Ulrich Drepper.
5803 * AVX support in x86-64 auditing support in ld.so.
5804 Implemented by H.J. Lu.
5806 * STB_GNU_UNIQUE support added.
5807 Implemented by Ulrich Drepper.
5809 * Implement second fallback mode for optimized DNS lookup for even more
5810 broken environments. If two requests from the same port are not
5811 handled correctly close the socket and open a new one before sending
5812 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5813 can be used to select this mode right away, instead of rediscovering the
5814 necessity is every process again.
5815 Implemented by Ulrich Drepper.
5817 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5818 Implemented by Adam Tkac.
5820 * Optimized iconv conversions for S390x.
5821 Implemented by Andreas Krebbel.
5823 * Using condvars with PI mutexes is now more efficient due to kernel
5824 support for requeueing to PI futexes. NPTL support added for x86-64.
5825 Implemented by Ulrich Drepper.
5827 * New locales: ps_AF, my_MM
5831 * The following bugs are resolved with this release:
5833 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5834 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5835 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5836 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5837 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5839 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5840 Implemented by Ulrich Drepper.
5842 * New Linux interfaces: accept4, fallocate, fallocate64.
5843 Implemented by Ulrich Drepper.
5845 * Correct declarations of string function when used in C++ code. This
5846 could lead to compile errors for invalid C++ code.
5848 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5851 * New POSIX 2008 interface: psiginfo
5852 Implemented by Ulrich Drepper.
5854 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5855 Implemented by Ulrich Drepper.
5857 * Support for selecting between multiple function definitions at runtime
5858 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5860 * The libcrypt library can now use the hash function implementations in
5861 NSS. Implemented by Ulrich Drepper.
5863 * The malloc implementation can be compiled to be less memory efficient
5864 but higher performing in multi-threaded programs.
5865 Implemented by Ulrich Drepper.
5867 * New locales: nan_TW@latin, ks_IN
5869 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5870 Implemented by Ulrich Drepper.
5872 * Extended printf hook support. It is possible to use user-defined types
5873 and extend existing format specifiers.
5874 Implemented by Ulrich Drepper.
5876 * Handling for group shadow files has been added.
5877 Implemented by Ulrich Drepper.
5879 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5880 servers (the case, e.g., for some people using the built-in DNS
5881 server in ADSL modems/routers). There is a once-per-process timeout
5882 in case of a broken server. To avoid it, users can run nscd or put
5883 'options single-request' in /etc/resolv.conf.
5884 Implemented by Ulrich Drepper.
5888 * The following bugs are resolved with this release:
5890 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5891 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5892 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5893 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5894 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5896 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5897 up at the same time. Implemented by Ulrich Drepper.
5899 * TLS descriptors for LD and GD on x86 and x86-64.
5900 Implemented by Alexandre Oliva.
5902 * getaddrinfo now handles DCCP and UDPlite.
5903 Implemented by Ulrich Drepper.
5905 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5906 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5907 Implemented by Ulrich Drepper.
5909 * New implementation of memmem, strstr, and strcasestr which is O(n).
5910 Implemented by Eric Blake.
5912 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5914 * Implement "e" option for popen to open file descriptor with the
5915 close-on-exec flag set. Implemented by Ulrich Drepper.
5917 * Implement "b" mode for fmemopen. In this mode writes writes don't
5918 implicitly add a NUL byte and seeks from the end of the buffer really
5919 use the buffer end, not the string length as the basis.
5920 Implemented by Ulrich Drepper.
5922 * Many functions, exported and internal, now atomically set the close-on-exec
5923 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5925 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5927 Implemented by Pravin Satpute.
5929 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5933 * The following bugs are resolved with this release:
5935 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5936 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5937 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5938 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5939 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5940 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5941 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5943 * New locales: bo_CN, bo_IN, shs_CA.
5945 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5947 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5948 Implemented by Pravin Satpute.
5950 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5952 * nscd caches now all timeouts for DNS entries
5953 Implemented by Ulrich Drepper.
5955 * nscd is more efficient and wakes up less often.
5956 Implemented by Ulrich Drepper.
5958 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5959 vdprintf, and obstack_vprintf.
5960 Implemented by Jakub Jelinek.
5962 * Faster memset for x86-64.
5963 Implemented by Harsha Jagasia and H.J. Lu.
5965 * Faster memcpy on x86.
5966 Implemented by Ulrich Drepper.
5968 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5969 Implemented by Ulrich Drepper.
5971 * Faster sqrt and sqrtf implementation for some PPC variants.
5972 Implemented by Steven Munroe.
5976 * The following bugs are resolved with this release:
5978 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5979 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5980 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5981 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5982 5071, 5103, 5104, 5112, 5113, 5184, 5186
5984 * More checking functions: fread, fread_unlocked, open*, mq_open.
5985 Implemented by Jakub Jelinek and Ulrich Drepper.
5987 * Extend fortification to C++. Implemented by Jakub Jelinek.
5989 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5990 by not recognizing 'a' as a modifier when those specs are requested.
5991 Implemented by Jakub Jelinek.
5993 * PPC optimizations to math and string functions.
5994 Implemented by Steven Munroe.
5996 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5997 options to be passed. Implemented by Ulrich Drepper.
5999 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
6001 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
6002 Implemented by Ulrich Drepper.
6004 * Handle private futexes in the NPTL implementation.
6005 Implemented by Jakub Jelinek and Ulrich Drepper.
6007 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
6008 Implemented by Roland McGrath and Ulrich Drepper.
6010 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
6012 * SHA-256 and SHA-512 based password encryption.
6013 Implemented by Ulrich Drepper.
6015 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
6016 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
6019 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
6020 Implemented by Ulrich Drepper.
6024 * The following bugs are resolved with this release:
6026 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
6027 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
6028 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
6029 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
6030 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
6031 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
6032 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
6035 * New Linux interfaces: epoll_pwait, sched_getcpu.
6037 * New generic interfaces: strerror_l.
6039 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6043 * The following bugs are resolved with this release:
6045 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6046 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6047 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6048 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6049 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6050 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6051 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6052 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6053 3225, 3251, 3252, 3253, 3273
6055 * For Linux, the sorting of addresses returned by getaddrinfo now also
6056 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6057 Implemented by Ulrich Drepper.
6059 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6060 Implemented by Ulrich Drepper.
6062 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6064 * New iconv module for MIK. Contributed by Alexander Shopov.
6066 * For sites with broken group and/or passwd database, the auto-propagate
6067 option of nscd can prevent creating ID lookup entries from the results
6068 of a name lookup and vice versa. This usually is no problem but some
6069 site might have problems with the default behavior.
6070 Implemented by Ulrich Drepper.
6072 * Iterating over entire database in NIS can be slow. With the
6073 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6074 to trade time for memory. The entire database will be read at once.
6075 Implemented by Ulrich Drepper.
6077 * The interfaces introduced in RFC 3542 have been implemented by
6080 * Support for the new ELF hash table format was added by Ulrich Drepper.
6082 * Support for priority inheritance mutexes added by Jakub Jelinek and
6085 * Support for priority protected mutexes added by Jakub Jelinek.
6087 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6088 or_IN, csb_PL, fy_NL, sr_ME.
6092 * More overflow detection functions.
6094 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6095 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6097 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6098 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6099 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6100 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6101 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6102 by Masahide Washizawa.
6104 * It is now possible to install audit libraries for the dynamic linker using
6105 LD_AUDIT. Implemented by Ulrich Drepper.
6107 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6108 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6109 For a libc and libpthread that works well on Linux 2.4 kernels, we
6110 recommend using the stable 2.3 branch.
6112 * The new function open_wmemstream acts like open_memstream,
6113 but uses a wchar_t wide character buffer.
6115 * The new function ppoll is an improved version of poll, similar to pselect.
6117 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6118 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6119 renameat, unlinkat, linkat, symlinkat, readlinkat.
6121 * New Linux kernel system calls: unshare,
6122 inotify_init, inotify_add_watch, inotify_rm_watch.
6124 * The euidaccess function is now also known by the alias eaccess,
6125 for compatibility with some other systems.
6127 * Timezone data updated to 2006b version.
6131 * The following bugs are resolved with this release:
6133 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6134 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6135 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6136 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6137 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6138 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6140 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6142 * As of this release, GCC 4 can be used to compile the C Library.
6144 * Timezone data updated to 2005m version.
6148 * The following bugs are resolved with this release:
6150 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6151 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6152 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6153 777, 787, 821, 822, 823, 825
6155 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6159 * Support for RFC 3678. Real implementations exist only for Linux so far.
6160 Implemented by Ulrich Drepper.
6162 * nscd can now cache entries persistently. Expiring entries are reloaded.
6163 For speedups the cache can be shared in memory with client processes.
6164 Implemented by Ulrich Drepper.
6166 * nscd can now perform SELinux checks.
6167 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6169 * getaddrinfo queries are now cached. Canonical name lookup is performed
6171 Implemented by Ulrich Drepper.
6173 * The nothrow function attribute is used when headers are used by gcc when
6174 compiling C code. This can avoid significant amounts of exception
6177 * The malloc functions perform more error checking and are stricter when
6178 it comes to reacting on errors. The default action is to terminate
6179 the process after showing an error message. Implemented by Ulrich Drepper.
6181 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6182 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6184 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6185 namespaces using the new function dlmopen(). This feature is of course,
6186 like most other dynamic loading functionality, not available in statically
6187 linked applications. Implemented by Ulrich Drepper.
6189 * Low-overhead boundary checking variants of string and some stdio functions
6190 were added. These are to be used in conjunction with a gcc patch by
6191 Jakub Jelinek which adds calls to these functions if possible.
6192 Implemented by Jakub Jelinek and Ulrich Drepper.
6194 * Old code for several operating systems and machine architectures that
6195 have not been in working condition in a long time have been removed from
6196 the main source tree maintained by the GNU C Library's maintainers.
6197 These files are now reside in the separate `ports' source module
6198 that is usable as an add-on when building the library.
6202 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6203 interrogate the dynamic linker, compatible with the Solaris interface.
6205 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6206 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6208 * getifaddrs now uses the netlink interface on Linux to get its information.
6209 Implemented by Thorsten Kukuk.
6211 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6212 Implemented by Ulrich Drepper.
6214 * support for non-executable stacks on x86 has been added. Changes mostly
6217 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6220 * getaddrinfo now performs destination address selection according to
6225 * Thread-safe interfaces for many functions that access locale data
6226 were added in version 2.3, but these features were omitted from NEWS.
6227 Many functions have variants with an `_l' suffix that take a `locale_t'
6228 object as a parameter rather than consulting the current locale.
6229 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6230 create and maintain `locale_t' objects. Additionally, the new function
6231 `uselocale' sets "the current locale" (as used by functions not so
6232 parameterized) set for an individual thread. These features were added
6233 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6235 * The functions getresuid, getresgid, setresuid, and setresgid, which
6236 have long been available on Linux, are now declared in <unistd.h>
6237 and are now also available on the Hurd.
6239 * ELF thread-local storage support (TLS) now works on x86-64.
6241 * The new dynamic string token $LIB is expanded in shared library names.
6242 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6244 * Aldy Hernandez contributed complete software floating point support for
6245 PowerPC machines with no FPU.
6247 * fexecve is implemented on Linux.
6249 * The `btowc' function should work at least twice as fast due to
6250 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6252 * With appropriate thread add-ons cancelable functions are now implemented
6253 in libc.so as well. No need to call the function in libpthread. This
6254 change allowed to finally disable the incorrect and expensive handling
6255 of weak definition in ld.so.
6257 * Yet more PLT entries in libc.so have been removed. We finally arrived
6258 at the bare minimum. Startup times improved appropriately.
6260 * Support for the new Linux/x86 system call interface was added. The
6261 AT_SYSINFO auxiliary vector entry is recognized and handled.
6265 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6268 * iconv (the program and the interface) now accepts empty names (excluding
6269 options like //TRANSLIT) to mean "use charset of current locale".
6271 * localedef can now transliterate characters in strings which are not in
6272 the provided charmap. The information from the input locale is used.
6274 * Prelinking support was added for ELF targets. This requires additional
6275 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6277 * Read-only stdio streams now use mmap to speed up operation by eliminating
6278 copying and buffer underflows. To use add 'm' to the mode string of
6279 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6281 * The malloc functions were completely rewritten by Wolfram Gloger based
6282 on Doug Lea's malloc-2.7.0.c.
6284 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6285 implementation of regex.
6287 * Bruno Haible upgraded the iconv and locale implementation to support
6290 * Contents of the LC_* and LANG environment variables in the CEN style are
6291 not recognized anymore. It never was used. Change by Ulrich Drepper.
6293 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6294 thread-local storage (TLS) ABI on some platforms.
6295 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6297 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6298 EUC-JISX0213, and TSCII.
6300 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6301 BSD-compatible interface for getting all network interface addresses.
6302 Implementation for IPv4 by Roland McGrath.
6304 * Loading of locale data is faster due to the introduction of a locale
6305 archive. Implemented by Roland McGrath and Ulrich Drepper.
6307 * Startup times are significantly reduced by not using exported functions
6308 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6311 * Steven Munroe contributed a port to PowerPC64/Linux.
6315 * The Hurd now uses the GNU libio implementation of stdio rather than the
6316 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6318 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6319 with the same behavior as the Linux system call of the same name.
6323 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6324 128-bit long double format.
6326 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6327 IBM1161, and IBM1162 charsets.
6329 * Andreas Jaeger contributed a port to x86-64/Linux.
6331 * Peter Bruin contributed a port to PowerPC/Hurd.
6333 * libc functions using I/O streams now can handle wide-oriented streams
6336 * optimizations in the dynamic linker. Binaries created by recent binutils
6337 versions start up quicker due to reduced time spent on relocations.
6339 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6343 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6344 asinh, atanh, j0 for the 128-bit long double format.
6346 * Bruno Haible updated all the code handling Unicode in some form to
6347 support Unicode 3.1.
6349 * Speed of regex for single-byte locales is back to previous levels.
6350 Patch by Isamu Hasegawa.
6352 * Alpha, SPARC, and IA-64 now also using floating stacks.
6354 * Startup time of internationalized applications greatly improved through
6355 iconv cache. Use iconvconfig to generate the cache file.
6356 Contributed by Ulrich Drepper.
6358 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6359 severe performance problems. Patch by David Mosberger.
6361 * The Hurd port got a lot more functionality like AIO, various stdio
6362 extensions, etc. Mainly done by Roland McGrath.
6364 * mtrace can now lookup symbols in shared libraries.
6368 * Intel's IA-64 math library is largely integrated. It provides fast and
6369 accurate implementatations for most basic and standard math functions
6370 in float, double, and long double format.
6372 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6373 and asin for the 96-bit long double format and asin, log, tan for the
6374 128-bit long double format.
6376 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6377 The basic double functions exist today. Contributed by Abraham Ziv
6378 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6379 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6381 * An asynchronous name lookup library was added. The interface is designed
6382 after POSIX AIO. The proposal was circulated beforehand to get comments.
6383 No negative ones came in. Implemented by Ulrich Drepper.
6385 * Port to S390/64bit contributed by Martin Schwidefsky
6386 <schwidefsky@de.ibm.com>.
6388 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6389 of functions for Linux/IA-64.
6391 * The RPC code is now thread safe. Threads can now use the same service
6392 of different services at the same time. Patch by Eric Norum
6393 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6395 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6396 family of functions for Linux/S390.
6398 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6399 of functions for Linux/x86.
6401 * Port to Linux/CRIS contributed by Axis Communications.
6405 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6406 we can now check for namespace violations and missing declarations. The
6407 result is that almost all headers are now Unix-compliant (as defined in
6408 the upcoming XPG6). The negative side is that some programs might need
6409 corrections, too, if they depend on the incorrect form of the headers in
6410 previous versions which defined too many symbols and included too many
6413 * regex now handles multibyte character sets correctly.
6414 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6416 * iconv (the program) does now conform to the upcoming XPG6 and handles
6417 charmaps. Instead of the charset names the path of charmaps can be
6418 provided and the conversion happens based on this data.
6419 Contributed by Ulrich Drepper.
6421 * The locale program now provides detailed information about the installed
6426 only lists the names of the supported locales
6430 provides details such as country, language, and codeset name.
6431 Contributed by Ulrich Drepper.
6435 * The gencat program now parses the input file according to the charset
6436 selected by the LC_CTYPE category. This is important for stateful
6437 character sets. To make generating catalogs easier there is a way
6438 to overwrite the charset selected by the locale: before the first
6439 message or $ quote line the catalog can contain a line like
6441 $ codeset=ISO-8859-2
6443 to select the charset (ISO-8859-2 in this case).
6445 Implemented by Shinya Hanataka and Ulrich Drepper.
6447 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6448 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6449 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6451 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6452 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6454 * The LANGUAGE environment variable is now ignored unless the locale is
6455 changed from the default "C" locale.
6457 * The usual bug fixes.
6461 * Greg McGary added runtime support for bounds checking using gcc's
6462 new -fbounded-pointers option. ix86 target is complete. PowerPC
6465 * Thorsten Kukuk added secure mode support to nscd.
6467 * The Berkeley db libraries have been removed.
6469 Related, the nss_db module is now in a separate package since it
6470 obviously requires a database library being available.
6472 * Wide character I/O streams implemented by Ulrich Drepper.
6474 * Functions from the extended socket API added by Ulrich Drepper.
6476 * Functions feenableexcept and fedisableexcept to control the
6477 behaviour of individual exceptions have been added by Andreas Jaeger.
6479 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6481 * The resolver code has been updated from bind 8.2.3-T5B which supports
6482 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6485 This change could in some situations effect backward compatibility. Since
6486 now `_res' is a thread-local instead of a global variable, modifying it
6487 in one thread does not have any effect in other threads.
6489 The resolver library was also extended to allow IPv6 as the transport
6490 protocol for the requests. This work was done by Stig Venaas.
6492 * Compatibility code for K&R C compilers has been removed from the
6493 header files. A ISO C compiler is needed to use the library
6494 (conforming to either C89 or C99 standard).
6496 * Complete rewrite of the localedef program to support multibyte character
6497 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6498 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6499 Implemented by Ulrich Drepper.
6501 Bruno Haible significantly improved the generation and use of the data
6502 structures for the wide character tables.
6504 * Plural handling in gettext implemented by Ulrich Drepper.
6506 * The utmp daemon has been removed.
6508 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6510 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6513 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6515 * POSIX barriers implemented by Kaz Kylheku.
6517 * POSIX spawn function family implemented by Ulrich Drepper.
6519 * POSIX spinlocks are now available.
6521 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6523 * the configure option --enable-kernel=X.Y.Z allows to strip out
6524 compatibility for kernel versions before X.Y.Z. This is currently only
6525 implemented for Linux.
6527 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6528 field sin6_scope_id. This means that all programs using IPv6 should be
6529 recompiled. Don't expect binary compatibility with previous glibc
6532 * various conversion modules for IBM character sets contributed by
6535 * IA-64 port by Jes Sorensen and HJ Lu.
6549 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6551 * New xdr functions are added; some rpc functions are now 64bit clean.
6553 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6555 * Fixed known incompatibilities with glibc 2.0.
6557 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6559 * Optimized a number of functions (especially the ELF dynamic loader).
6561 * Update timezone data files.
6563 * lots of charmaps corrections
6565 * some new locale definitions and charmaps
6570 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6571 conform to POSIX member type requirements. Symbol versions have been
6572 adjusted as needed within the library, and for direct use by applications,
6573 but there is potential for problems if third-party libraries use
6574 struct timeval as part of their interface. This does not present
6575 a problem for X and other "essential" system libraries.
6577 * An additional locale model to support C++ Standard Library locale
6578 model and probably more was implemented by Ulrich Drepper.
6580 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6583 * Miles Bader provided the `argp' function family to support hierarchical
6584 command line argument parsing, layered on top of getopt.
6586 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6588 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6591 * scanf recognizes the %a and %A format for scanning floating point numbers.
6593 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6594 information and interfaces for the available integer types.
6596 * about 130 new math functions were added to implement the ISO C9x math
6599 * the new header <complex.h> contains definitions of the complex math
6600 functions from ISO C 9X.
6602 * the new header <tgmath.h> defines generic macros to use complex or
6603 real valued functions.
6605 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6607 * Andreas Jaeger provided a test suite for the math library.
6609 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6611 * Ulrich Drepper added character set conversion functions (iconv).
6613 * Optimized string functions have been added.
6615 * The localedata addon is now part of glibc.
6617 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6619 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6620 daemon for NSS (nscd).
6622 Missing a better place here are some numbers on improvements. Under
6623 Linux 2.1.125 un-tar-ing the kernel sources takes
6627 using local files 12.19s 6.88s 22.91s
6629 using NIS 13.92s 8.91s 26.34s
6631 using NIS & nscd 10.37s 7.34s 25.30s
6633 using NIS+ 27.57s 30.37s 640.46s
6635 using NIS+ & nscd 10.25s 7.83s 26.51s
6637 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6639 Keep in mind that non-namelookup related operations dominate above times.
6640 It was just a common complain that using NIS+ unpacking the kernel is
6643 [1] The old nscd implementation is not available anymore since it was
6644 distributed with glibc up to version 2.0.98 and thus is now replaced.
6646 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6648 * Mark Kettenis provided a Hesiod NSS module.
6650 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6651 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6653 * rcmd can now handle netgroups (Dick Streefland).
6655 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6658 * Support for the IPv6 protocol has been added to the socket API, as per the
6659 latest draft standards.
6661 * Support for Linux 2.2 has been added.
6663 * Interface changes relative to the latest 2.0.x release:
6664 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6665 addseverity NEW: Unix98
6666 alphasort64 NEW: LFS
6667 argp_err_exit_status NEW: argp, GNU ext
6668 argp_error NEW: argp, GNU ext
6669 argp_failure NEW: argp, GNU ext
6670 argp_help NEW: argp, GNU ext
6671 argp_parse NEW: argp, GNU ext
6672 argp_program_bug_address NEW: argp, GNU ext
6673 argp_program_version NEW: argp, GNU ext
6674 argp_program_version_hook NEW: argp, GNU ext
6675 argp_state_help NEW: argp, GNU ext
6676 argp_usage NEW: argp, GNU ext
6677 authdes_create NEW: Secure RPC
6678 authdes_getucred NEW: Secure RPC
6679 authdes_pk_create NEW: Secure RPC
6680 backtrace NEW: GNU ext.
6681 backtrace_symbols NEW: GNU ext.
6682 backtrace_symbols_fd NEW: GNU ext.
6684 cacosf NEW: ISO C 9x
6685 cacosh NEW: ISO C 9x
6686 cacoshf NEW: ISO C 9x
6687 cacoshl NEW: ISO C 9x
6688 cacosl NEW: ISO C 9x
6695 casinf NEW: ISO C 9x
6696 casinh NEW: ISO C 9x
6697 casinhf NEW: ISO C 9x
6698 casinhl NEW: ISO C 9x
6699 casinl NEW: ISO C 9x
6701 catanf NEW: ISO C 9x
6702 catanh NEW: ISO C 9x
6703 catanhf NEW: ISO C 9x
6704 catanhl NEW: ISO C 9x
6705 catanl NEW: ISO C 9x
6706 cbc_crypt NEW: Secure RPC
6710 ccoshf NEW: ISO C 9x
6711 ccoshl NEW: ISO C 9x
6717 cimagf NEW: ISO C 9x
6718 cimagl NEW: ISO C 9x
6719 clearerr_locked REMOVED
6720 clntunix_create NEW: sunrpc ext
6722 clog10 NEW: ISO C 9x
6723 clog10f NEW: ISO C 9x
6724 clog10l NEW: ISO C 9x
6734 cprojf NEW: ISO C 9x
6735 cprojl NEW: ISO C 9x
6737 crealf NEW: ISO C 9x
6738 creall NEW: ISO C 9x
6743 csinhf NEW: ISO C 9x
6744 csinhl NEW: ISO C 9x
6747 csqrtf NEW: ISO C 9x
6748 csqrtl NEW: ISO C 9x
6752 ctanhf NEW: ISO C 9x
6753 ctanhl NEW: ISO C 9x
6755 des_setparity NEW: Secure RPC
6756 ecb_crypt NEW: Secure RPC
6757 endutxent NEW: Unix98
6759 exp10f NEW: ISO C 9x
6760 exp10l NEW: ISO C 9x
6764 fattach NEW: STREAMS
6765 fdetach NEW: STREAMS
6769 feclearexcept NEW: ISO C 9x
6770 fegetenv NEW: ISO C 9x
6771 fegetexceptflag NEW: ISO C 9x
6772 fegetround NEW: ISO C 9x
6773 feholdexcept NEW: ISO C 9x
6775 feraiseexcept NEW: ISO C 9x
6776 ferror_locked REMOVED
6777 fesetenv NEW: ISO C 9x
6778 fesetexceptflag NEW: ISO C 9x
6779 fesetround NEW: ISO C 9x
6780 fetestexcept NEW: ISO C 9x
6781 feupdateenv NEW: ISO C 9x
6782 fflush_locked REMOVED
6786 fgets_unlocked NEW: GNU ext.
6787 fileno_locked REMOVED
6799 fputc_locked REMOVED
6800 fputs_unlocked NEW: GNU ext.
6801 fread_unlocked NEW: GNU ext.
6806 fstatvfs NEW: Unix98
6810 ftruncate64 NEW: LFS
6812 fwrite_unlocked NEW: GNU ext.
6813 gai_strerror NEW: IPv6
6817 getchar_locked REMOVED
6819 getdate_err NEW: Unix98
6820 getdate_r NEW: GNU ext.
6822 getnameinfo NEW: IPv6
6823 getnetname NEW: Secure RPC
6824 getpmsg NEW: STREAMS
6825 getpt NEW: Unix98 PTY
6826 getrlimit64 NEW: LFS
6827 getutxent NEW: Unix98
6828 getutxid NEW: Unix98
6829 getutxline NEW: Unix98
6830 glob64 NEW: GNU ext.
6831 globfree64 NEW: GNU ext.
6832 gnu_get_libc_release NEW: GNU ext.
6833 gnu_get_libc_version NEW: GNU ext.
6834 grantpt NEW: Unix98 PTY
6835 host2netname NEW: Secure RPC
6837 iconv_close NEW: iconv
6838 iconv_open NEW: iconv
6839 if_freenameindex NEW: IPv6
6840 if_indextoname NEW: IPv6
6841 if_nameindex NEW: IPv6
6842 if_nametoindex NEW: IPv6
6843 in6addr_any NEW: IPv6
6844 in6addr_loopback NEW: IPv6
6845 inet6_isipv4mapped NEW: IPv6
6846 isastream NEW: STREAMS
6847 iswblank NEW: GNU ext.
6848 key_decryptsession NEW: Secure RPC
6849 key_decryptsession_pk NEW: Secure RPC
6850 key_encryptsession NEW: Secure RPC
6851 key_encryptsession_pk NEW: Secure RPC
6852 key_gendes NEW: Secure RPC
6853 key_get_conv NEW: Secure RPC
6854 key_secretkey_is_set NEW: Secure RPC
6855 key_setnet NEW: Secure RPC
6856 key_setsecret NEW: Secure RPC
6857 llrint NEW: ISO C 9x
6858 llrintf NEW: ISO C 9x
6859 llrintl NEW: ISO C 9x
6860 llround NEW: ISO C 9x
6861 llroundf NEW: ISO C 9x
6862 llroundl NEW: ISO C 9x
6867 lrintf NEW: ISO C 9x
6868 lrintl NEW: ISO C 9x
6869 lround NEW: ISO C 9x
6870 lroundf NEW: ISO C 9x
6871 lroundl NEW: ISO C 9x
6873 makecontext NEW: Unix98
6874 mempcpy NEW: GNU ext.
6877 modify_ldt NEW: kernel
6881 nearbyint NEW: ISO C 9x
6882 nearbyintf NEW: ISO C 9x
6883 nearbyintl NEW: ISO C 9x
6884 netname2host NEW: Secure RPC
6885 netname2user NEW: Secure RPC
6886 nexttoward NEW: ISO C 9x
6887 nexttowardf NEW: ISO C 9x
6888 nexttowardl NEW: ISO C 9x
6892 passwd2des NEW: Secure RPC
6894 pow10f NEW: GNU ext.
6895 pow10l NEW: GNU ext.
6898 printf_size NEW: GNU ext.
6899 printf_size_info NEW: GNU ext.
6900 profil_counter REMOVED
6901 pthread_mutexattr_getkind_np REPLACED
6902 pthread_mutexattr_setkind_np REPLACED
6903 ptsname NEW: Unix98 PTY
6904 ptsname_r NEW: Unix98 PTY
6906 putchar_locked REMOVED
6907 putgrent NEW: GNU ext.
6909 putpmsg NEW: STREAMS
6910 pututxline NEW: Unix98
6914 readdir64_r NEW: LFS
6915 remquo NEW: ISO C 9x
6916 remquof NEW: ISO C 9x
6917 remquol NEW: ISO C 9x
6919 roundf NEW: ISO C 9x
6920 roundl NEW: ISO C 9x
6922 scalbln NEW: ISO C 9x
6923 scalblnf NEW: ISO C 9x
6924 scalblnl NEW: ISO C 9x
6926 sendfile NEW: kernel
6927 setcontext NEW: Unix98
6928 setrlimit64 NEW: LFS
6929 setutxent NEW: Unix98
6931 sigignore NEW: Unix98
6932 sigqueue NEW: POSIX.1b
6933 sigrelse NEW: Unix98
6934 sigset NEW: POSIX.1b
6935 sigtimedwait NEW: POSIX.1b
6936 sigwaitinfo NEW: POSIX.1b
6937 sincos NEW: GNU ext.
6938 sincosf NEW: GNU ext.
6939 sincosl NEW: GNU ext.
6943 strcasestr NEW: GNU ext.
6944 strtoimax NEW: ISO C 9x
6945 strtoumax NEW: ISO C 9x
6946 strverscmp NEW: GNU ext.
6947 svcauthdes_stats NEW: Secure RPC
6948 svcunix_create NEW: sunrpc etx
6949 svcunixfd_create NEW: sunrpc ext
6950 swapcontext NEW: Unix98
6951 tcgetsid NEW: Unix98 PTY
6952 tdestroy NEW: GNU ext.
6953 tgamma NEW: ISO C 9x
6954 tgammaf NEW: ISO C 9x
6955 tgammal NEW: ISO C 9x
6959 truncf NEW: ISO C 9x
6960 truncl NEW: ISO C 9x
6962 unlockpt NEW: Unix98 PTY
6963 updwtmpx NEW: Unix98
6964 user2netname NEW: Secure RPC
6965 utmpxname NEW: Unix98
6966 versionsort NEW: GNU ext.
6967 versionsort64 NEW: GNU ext.
6969 wcscasecmp NEW: GNU ext.
6970 wcsncasecmp NEW: GNU ext.
6971 wcsnlen NEW: GNU ext.
6972 wcstoimax NEW: ISO C 9x
6973 wcstoll NEW: ISO C 9x
6974 wcstoull NEW: ISO C 9x
6975 wcstoumax NEW: ISO C 9x
6977 wordexp NEW: POSIX.2
6978 wordfree NEW: POSIX.2
6979 write_profiling REMOVED
6980 xdecrypt NEW: Secure RPC
6981 xdr_authdes_cred NEW: Secure RPC
6982 xdr_authdes_verf NEW: Secure RPC
6983 xdr_cryptkeyarg NEW: Secure RPC
6984 xdr_cryptkeyarg2 NEW: Secure RPC
6985 xdr_cryptkeyres NEW: Secure RPC
6986 xdr_getcredres NEW: Secure RPC
6987 xdr_key_netstarg NEW: Secure RPC
6988 xdr_key_netstres NEW: Secure RPC
6989 xdr_keybuf NEW: Secure RPC
6990 xdr_keystatus NEW: Secure RPC
6991 xdr_netnamestr NEW: Secure RPC
6992 xdr_sizeof NEW: Secure RPC
6993 xdr_unixcred NEW: sunrpc ext
6994 xencrypt NEW: Secure RPC
6995 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7006 * inet_ntoa is thread-safe
7008 * updwtmp is moved from libutil to libc
7010 * rewrite of cbrt function
7012 * update of timezone data
7026 * add atoll function
7028 * fix complex problems in Berkeley DB code
7030 * fix math functions
7034 * fixed lots of header problems (especially Linux/GNU specific)
7036 * dynamic loader preserves all registers
7038 * Roland McGrath provided support for handling of auxiliary objects in
7039 the ELF dynamic loader.
7041 * support for parallel builds is improved
7045 * GNU extensions are no longer declared by default. To enable them you
7046 must define the macro `_GNU_SOURCE' in your program or compile with
7049 * The library has changed from using GNU ld symbol aliases to using weak
7050 symbols where available. The ELF object file format supports weak
7051 symbols; GNU ld also supports weak symbols in the a.out format. (There
7052 is also now support for other GNU ld extensions in ELF. Use the
7053 `--with-elf' option to configure to indicate you have ELF, and
7054 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7055 of many files which contained only symbol aliases, reducing the size of
7056 the source and the compiled library; many other files were renamed to
7057 less cryptic names previously occupied by the symbol alias files.
7058 There is a new header file <elf.h> for programs which operate on
7059 files in the ELF format.
7061 * Converted to Autoconf version 2, so `configure' has more options.
7062 Run `configure --help' to see the details.
7064 * The library can now be configured to build profiling, highly-optimized
7065 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7066 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7067 `configure' enable building these extra libraries. The shared library is
7068 built by default when using both ELF and GNU ld. When shared libraries
7069 are enabled, the new library `-ldl' is available for arbitrary run-time
7070 loading of shared objects; its interface is defined in <dlfcn.h>. The
7071 new header file <link.h> gives access to the internals of the run-time
7072 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7073 application of same name on other systems and it provides information
7074 about dynamically linked binaries.
7076 * The C library now provides the run-time support code for profiling
7077 executables compiled with `-pg'. Programs can control the profiling code
7078 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7079 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7080 the support for this file format was contributed by David Mosberger-Tang.
7082 * The math code has been replaced with a math library based on fdlibm from
7083 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7084 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7085 functions. The math functions now reside in a separate library, so
7086 programs using them will need to use `-lm' their linking commands.
7088 * John C. Bowman contributed optimized ix87 assembler inline functions.
7090 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7091 mechanism similar to that found in Solaris 2. This is now used for the
7092 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7093 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7094 file controls what services are used for each individual database. This
7095 works by loading shared libraries with names specified in `nsswitch.conf',
7096 so service modules can be changed or added at any time without even
7097 relinking any program. Currently there are the file, db, and NIS based
7098 NSS services available.
7100 * The new functions `strtoq' and `strtouq' parse integer values from
7101 strings, like `strtol' and `strtoul', but they return `long long int' and
7102 `unsigned long long int' values, respectively (64-bit quantities).
7104 * The new functions `strtof' and `strtold' parse floating-point values from
7105 strings, like `strtod', but they return `float' and `long double' values,
7106 respectively (on some machines `double' and `long double' are the same).
7108 * Ulrich Drepper has contributed new implementations of the floating-point
7109 printing and reading code used in the `printf' family of functions and
7110 `strtod', `strtof', and `strtold'. These new functions are perfectly
7111 accurate, and much faster than the old ones.
7113 * The implementation of the POSIX locale model was completely rewritten by
7114 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7115 to compile the POSIX locale definition.
7117 * The former dummy implementations of the strcoll and strxfrm function are
7118 now replaced by fully functional code contributed by Ulrich Drepper. The
7119 collation information comes from the POSIX locale definitions.
7121 * The new header <langinfo.h> defines an interface for accessing
7122 various locale-dependent data (using the locale chosen with `setlocale').
7124 * Ulrich Drepper has contributed a new suite of functions for operation on
7125 wide-character and multibyte-character strings, in <wchar.h>;
7126 and classification and case conversion of wide characters, in <wctype.h>.
7127 These new functions are conforming to the ISO C, Amendment 1 specification.
7129 * There is now a second implementation of the standard I/O library available.
7130 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7131 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7133 * You can now use positional parameter specifications in format strings
7134 for the `printf' and `scanf' families of functions. For example,
7135 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7136 ``Number 6, Mr Jones''. This is mainly useful when providing different
7137 format strings for different languages, whose grammars may dictate
7138 different orderings of the values being printed. To support this
7139 feature, the interface for `register_printf_handler' has changed; see
7140 the header file <printf.h> for details.
7142 * The `printf' and `scanf' families of functions now understand a new
7143 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7144 to group numbers as indicated by the locale; for `scanf' and friends, this
7145 says to accept as valid only a number with all the proper grouping
7146 separators in the right places. In the default "C" locale, numbers are
7147 not grouped; but locales for specific countries will define the usual
7148 conventions (i.e. separate thousands with `,' in the US locale).
7150 * The pgrp functions have been regularized, slightly incompatibly but much
7151 less confusingly. The core functions are now `getpgid' and `setpgid',
7152 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7153 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7154 provided for compatibility. There is no longer an incompatible `getpgrp'
7155 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7157 * The new header file <fts.h> and suite of functions simplify programs that
7158 operate on directory trees. This code comes from 4.4 BSD.
7160 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7161 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7162 NSS scheme used in glibc.
7164 * There is a new malloc debugging hook `__memalign_hook'.
7166 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7167 `unsigned int' in <sys/types.h>. These are for compatibility only and
7168 their use is discouraged.
7170 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7171 done differently, so that it works even without GNU ld.
7173 * New function `euidaccess' checks allowed access to a file like `access',
7174 but using the effective IDs instead of the real IDs.
7176 * The time zone data files have been updated for the latest and greatest
7177 local time conventions of the countries of the world.
7179 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7182 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7183 for formatting floating-point numbers. They are provided only for
7184 compatibility; new programs should use `sprintf' instead. There are
7185 also equivalent function for the `long double' floating-point type and
7186 all functions also exist in a reentrant form.
7188 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7189 functions for maintaining the login-record files (primarily of use to
7190 system programs such as `login'), and convenient functions for
7191 allocating and initializing a pseudo-terminal (pty) device.
7193 * Ulrich Drepper has contributed new support for System V style
7194 shared memory and IPC on systems that support it.
7196 * Ulrich Drepper has contributed several miscellaneous new functions found
7197 in System V: The `hsearch' family of functions provide an effective
7198 implementation of hash tables; `a64l' and `l64a' provide a very simple
7199 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7202 * Ulrich Drepper has contributed new reentrant counterparts for the
7203 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7205 * Ulrich Drepper has contributed new, highly-optimized versions of several
7206 string functions for the i486/Pentium family of processors.
7208 * Ulrich Drepper has updated the Linux-specific code, based largely
7209 on work done in Hongjiu Lu's version of GNU libc for Linux.
7210 The GNU library now supports Linux versions 2.0.10 and later,
7211 using the ELF object file format (i[3456]86-*-linux).
7213 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7215 * David Mosberger-Tang and Richard Henderson have ported the C library
7216 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7217 dynamic linking support for ELF/Alpha.
7219 * Richard Henderson contributed several Alpha optimized assembler function
7220 for arithmetic and string handling.
7222 * Ulrich Drepper has contributed a new set of message catalog functions to
7223 support multiple languages using the <libintl.h> interface, for use with
7224 his new package GNU gettext. Translation volunteers have contributed
7225 catalogs of the library's messages in Spanish, German, and Korean.
7227 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7228 program and the `catgets' function for reading the catalog files it
7229 creates. (The <libintl.h> interface is preferred; we include the
7230 <nl_types.h> interface using `catgets' only for source compatibility with
7231 programs already written to use it.)
7233 * New header file <values.h> gives SVID-compatible names for <limits.h>
7236 * Various new macros, declarations, and small header files for compatibility
7239 * New function `group_member' is a convenient way to check if a process has
7240 a given effective group ID.
7242 * When using GCC 2.7 and later, the socket functions are now declared in a
7243 special way so that passing an argument of type `struct sockaddr_in *',
7244 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7245 `struct sockaddr *' type, does not generate a type-clash warning.
7247 * New function `error' declared in header file <error.h> is a convenient
7248 function for printing error messages and optionally exiting; this is the
7249 canonical function used in GNU programs. The new functions `err', `warn',
7250 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7251 doing the same thing.
7253 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7254 POSIX.2 `glob' function to do ~ and {...} expansion.
7256 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7257 `clearenv' which is used in POSIX.9 is also available.
7259 * New function `getsid' returns session ID number on systems that support it.
7261 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7262 files <db.h> and <mpool.h> provide a rich set of functions for several
7263 types of simple databases stored in memory and in files, and <ndbm.h> is
7264 an old `ndbm'-compatible interface using the `db' functions. Link with
7265 `-ldb' to get these functions.
7267 * New macro `strdupa' copies a string like `strdup', but uses local stack
7268 space from `alloca' instead of dynamic heap space from `malloc'.
7270 * New function `strnlen' is like `strlen' but searches only a given maximum
7271 number of characters for the null terminator. `stpncpy', `strndup' and
7272 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7275 * New function `statfs' in header <sys/statfs.h>.
7277 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7278 provide convenient functions for operating on blocks of null-terminated
7281 * A new suite of functions in <utmp.h> handle all the details of reading
7282 and writing the utmp file.
7284 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7287 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7288 completely POSIX compliant and also implemented the extended functionality
7289 to handle alternate digit representation and alternate era date formats.
7291 * Ulrich Drepper provided an implementation of the `strptime' function
7292 defined in XPG4.2 which transforms a string into a `struct tm' value.
7294 * Paul Eggert provided the tzselect shell script as part of the timezone
7295 code. The shell script makes it easy to select the correct timezone
7298 * The implementation of the malloc family of functions is completely replaced
7299 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7300 The implementation uses the mmap function (if available) and it is
7301 optimized for the use in multi threaded programs.
7303 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7304 functions. This new functionality is usable by specifying a special
7305 salt string and it is compatible with implementation on *BSD systems.
7307 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7308 `getsubopt' to handle second level command line options, `bsd_signal'
7309 to access BSD style `signal' functionality, the obsolete `regexp' style
7312 * the `lchown' function is available on system which support this
7315 * The implementation of the shadow password handling function was contributed
7318 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7320 * POSIX.1g support was added. The <sys/select.h> header is available,
7321 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7322 implementation of `getaddrinfo'.
7326 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7328 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7329 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7331 * The new function `daemon' from 4.4 BSD is useful for server programs that
7332 want to put themselves in the background.
7334 * Joel Sherrill has contributed support for several standalone boards that
7335 run without an operating system.
7337 * `printf', `scanf' and friends now accept a `q' type modifier for long
7338 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7340 * All of the code taken from BSD (notably most of the math and networking
7341 routines) has been updated from the BSD 4.4-Lite release.
7343 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7345 * The new functions `getdomainname' and `setdomainname' fetch or change the
7346 YP/NIS domain name. These are system calls which exist on systems which
7349 * The time zone data files have been updated for the latest international
7352 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7353 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7357 * The C library now includes support for Sun RPC, from Sun's free
7358 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7359 are included. (There is still no support for YP.)
7361 * Tom Quinn has contributed a port of the C library to SGI machines running
7362 Irix 4 (mips-sgi-irix4).
7364 * The new `lockf' function is a simplified interface to the locking
7365 facilities of `fcntl', included for compatibility.
7367 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7369 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7371 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7374 * The error message printed by `assert' for a failed assertion now includes
7375 the name of the program (if using GNU ld) and the name of the calling
7376 function (with versions of GCC that support this).
7378 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7380 * The library now includes the <sys/mman.h> header file and memory
7381 management functions `mmap', `munmap', `mprotect', `msync', and
7382 `madvise', on systems that support those facilities.
7384 * The interface for `mcheck' has changed slightly: the function called to
7385 abort the program when an allocation inconsistency is detected now takes
7386 an argument that indicates the type of failure. The new function
7387 `mprobe' lets you request a consistency check for a particular block at
7388 any time (checks are normally done only when you call `free' or `realloc'
7391 * It is now possible to easily cross-compile the C library, building on one
7392 system a library to run on another machine and/or operating system. All
7393 you need to do is set the variable `HOST_CC' in `configparms' to the
7394 native compiler for programs to run on the machine you are building on (a
7395 few generator programs are used on Unix systems); set `CC' to the
7398 * The new function `fexecve' (only implemented on the GNU system) executes
7399 a program file given a file descriptor already open on the file.
7403 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7404 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7406 * You can set the variable `libprefix' in `configparms' to specify a prefix
7407 to be prepended to installed library files; this makes it easy to install
7408 the GNU C library to be linked as `-lgnuc' or whatever.
7410 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7411 copies a limited number of characters from a string, and returns the
7412 address of the last character written.
7414 * You no longer need to check for whether the installed `stddef.h' is
7415 compatible with the GNU C library. configure now checks for you.
7417 * You can now define a per-stream `fileno' function to convert the
7418 stream's cookie into an integral file descriptor.
7420 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7421 allocates zero bytes of storage, and returns a unique pointer which
7422 you can pass to `realloc' or `free'. The behavior is undefined if
7423 you dereference this pointer.
7425 * The C library now runs on Sony NEWS m68k machines running either
7426 NewsOS 3 or NewsOS 4.
7428 * The new `syscall' function is a system-dependent primitive function
7429 for invoking system calls. It has the canonical behavior on Unix
7430 systems, including unreliable return values for some calls (such as
7431 `pipe', `fork' and `getppid').
7433 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7434 to `EAGAIN', which is the preferred name. On systems whose kernels
7435 use two distinct codes, the C library now translates EWOULDBLOCK to
7436 EAGAIN in every system call function.
7440 * The GNU C Library Reference Manual is now distributed with the library.
7441 `make dvi' will produce a DVI file of the printed manual.
7442 `make info' will produce Info files that you can read on line using C-h i
7443 in Emacs or the `info' program.
7444 Please send comments on the manual to bug-glibc-manual@gnu.org.
7446 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7448 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7450 * Jason Merrill has contributed a port to the Sequent Symmetry running
7451 Dynix version 3 (i386-sequent-dynix).
7453 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7454 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7456 * New function `memory_warnings' lets you arrange to get warnings when
7457 malloc is running out of memory to allocate, like Emacs gives you.
7459 * The C library now contains the relocating allocator used in Emacs 19 for
7460 its editing buffers. This allocator (ralloc) minimizes allocation
7461 overhead and fragmentation by moving allocated regions around whenever it
7462 needs to. You always refer to a ralloc'd region with a "handle" (a
7463 pointer to a pointer--an object of type `void **').
7465 * There is a new `printf' format: `%m' gives you the string corresponding
7466 to the error code in `errno'.
7468 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7469 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7470 pass, the `a' modifier says to fill in a `char **' you pass with a
7473 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7474 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7475 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7477 * `mkstemp' is a traditional Unix function to atomically create and open a
7478 uniquely-named temporary file.
7482 * The standard location for the file that says what the local timezone is
7483 has changed again. It is now `/usr/local/etc/localtime' (or more
7484 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7486 * The distribution no longer contains any files with names longer than 14
7489 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7490 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7492 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7496 * The configuration process has changed quite a bit. The `configure'
7497 script is now used just like the configuration scripts for other GNU
7498 packages. The `sysdeps' directory hierarchy is much rearranged.
7499 The file `INSTALL' explains the new scheme in detail.
7501 * The header files no longer need to be processed into ANSI C and
7502 traditional C versions. There is just one set of files to install, and
7503 it will work with ANSI or old C compilers (including `gcc -traditional').
7505 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7506 MIPS DECStation running Ultrix 4.
7508 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7509 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7510 made itself into a shared library.
7512 * Yet further improved support for the i386, running 4.3 BSD-like systems
7513 (such as Mach 3 with the Unix single-server), or System V.
7515 * New function `strncasecmp' to do case-insensitive string comparison
7516 with limited length.
7518 * New function `strsep' is a reentrant alternative to `strtok'.
7520 * New functions `scandir' and `alphasort' for searching directories.
7522 * New function `setenv' is a better interface to `putenv'.
7524 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7525 function for traversing a directory tree.
7527 * The GNU obstack package is now also part of the C library.
7528 The new function `open_obstack_stream' creates a stdio stream that
7529 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7530 formatted output directly to an obstack.
7532 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7533 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7535 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7537 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7538 things to your strings.
7540 * There are some new test programs: test-fseek, testmb, and testrand.
7542 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7543 These ports are not finished, but are a good starting place for really
7544 supporting those systems.
7546 * `/etc/localtime' is now the standard location for the file that says what
7547 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7548 This follows the general principle that `/etc' is the place for all local
7549 configuration files.
7551 * The C library header files now use `extern "C"' when used by the C++
7552 compiler, so the C library should now work with C++ code.
7554 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7555 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7558 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7559 function which uses the `merge sort' algorithm, and is said to be
7560 significantly faster than the old GNU `qsort' function. Merge sort is
7561 now the standard `qsort' function. The new algorithm can require a lot
7562 of temporary storage; so, the old sorting function is called when the
7563 required storage is not available.
7565 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7566 provides the Unix `crypt' function, plus some other entry points.
7568 * The code and header files taken from 4.4 BSD have been updated with the
7569 latest files released from Berkeley.
7571 ----------------------------------------------------------------------
7574 Permission is granted to anyone to make or distribute verbatim copies
7575 of this document as received, in any medium, provided that the
7576 copyright notice and this permission notice are preserved,
7577 thus giving the recipient permission to redistribute in turn.
7579 Permission is granted to distribute modified versions
7580 of this document, or of portions of it,
7581 under the above conditions, provided also that they
7582 carry prominent notices stating who last changed them.
7585 version-control: never