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, and <unistd.h> will not declare the crypt function.
57 The replacement for libcrypt is libxcrypt, maintained separately from
58 GNU libc, but available under compatible licensing terms, and providing
59 binary backward compatibility with the former libcrypt. It is currently
60 distributed from <https://github.com/besser82/libxcrypt/>.
62 As a consequence of this removal, GNU libc no longer makes any use of
63 the NSS cryptography library (Network Security Services; not to be
64 confused with Name Service Switch). Distributors of binary packages
65 of GNU libc are advised to check whether their build processes can be
68 Changes to build and runtime requirements:
70 * Building on LoongArch requires at a minimum binutils 2.41 for vector
73 Security related changes:
75 CVE-2023-4527: If the system is configured in no-aaaa mode via
76 /etc/resolv.conf, getaddrinfo is called for the AF_UNSPEC address
77 family, and a DNS response is received over TCP that is larger than
78 2048 bytes, getaddrinfo may potentially disclose stack contents via
79 the returned address data, or crash.
81 CVE-2023-4806: When an NSS plugin only implements the
82 _gethostbyname2_r and _getcanonname_r callbacks, getaddrinfo could use
83 memory that was freed during buffer resizing, potentially causing a
84 crash or read or write to arbitrary memory.
86 CVE-2023-5156: The fix for CVE-2023-4806 introduced a memory leak when
87 an application calls getaddrinfo for AF_INET6 with AI_CANONNAME,
88 AI_ALL and AI_V4MAPPED flags set.
90 CVE-2023-4911: If a tunable of the form NAME=NAME=VAL is passed in the
91 environment of a setuid program and NAME is valid, it may result in a
92 buffer overflow, which could be exploited to achieve escalated
93 privileges. This flaw was introduced in glibc 2.34.
95 The following bugs are resolved with this release:
97 [The release manager will add the list generated by
98 scripts/list-fixed-bugs.py just before the release.]
104 * When C2X features are enabled and the base argument is 0 or 2, the
105 following functions support binary integers prefixed by 0b or 0B as
106 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
107 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
108 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
109 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
110 following functions support binary integers prefixed by 0b or 0B as
111 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
112 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
113 functions also support the %b format for binary integers, with or
114 without such a prefix and independent of standards mode.
116 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
119 * printf-family functions now support the wN format length modifiers for
120 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
121 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
122 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
123 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
124 specified in draft ISO C2X.
126 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
127 Transparent Huge Pages (THP) in stack allocation at pthread_create.
129 * Support for x86_64 running on Hurd has been added. This port requires
130 as least binutils 2.40 and GCC 13:
134 * Vector math library libmvec support has been added to AArch64. It
135 requires GCC version >= 10.1.0. It can be disabled via
136 "--disable-mathvec", however that is not a supported configuration as
137 it changes the ABI. The symbol names follow the AArch64 vector ABI,
138 they are declared in math.h and have to be called manually at this point.
140 * The strlcpy and strlcat functions have been added. They are derived
141 from OpenBSD, and are expected to be added to a future POSIX version.
143 * A new configure option, "--enable-fortify-source", can be used to build the
144 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
145 provided, or is set to the highest value supported by the compiler. If not
146 explicitly enabled, then fortify source is forcibly disabled so to keep
147 original behavior unchanged.
149 Deprecated and removed features, and other changes affecting compatibility:
151 * libcrypt is no longer built by default; one may use the "--enable-crypt"
152 option to build libcrypt. libcrypt is likely to be removed from the
153 GNU C Library in a future release, so it is recommended that
154 applications port away from it to an alternative such as libxcrypt.
156 * In the Linux kernel for the hppa/parisc architecture some of the
157 MADV_XXX constants were changed to have the same values as the other
158 architectures. New programs compiled with this glibc version and which
159 use the madvise call will require at least Linux kernel version 6.2,
160 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
161 5.4.228, 4.19.270 or 4.14.303.
163 * The "--disable-experimental-malloc" option is no longer available. The
164 per-thread cache can still be disabled per-application using tunables
165 (glibc.malloc.tcache_count set to zero).
167 * The configure option "--enable-tunables" has been removed. The tunable
168 feature is now always enabled.
170 Changes to build and runtime requirements:
172 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
175 Security related changes:
177 CVE-2023-25139: When the printf family of functions is called with a
178 format specifier that uses an <apostrophe> (enable grouping) and a
179 minimum width specifier, the resulting output could be larger than
180 reasonably expected by a caller that computed a tight bound on the
181 buffer size. The resulting larger than expected output could result
182 in a buffer overflow in the printf family of functions.
184 The following bugs are resolved with this release:
186 [178] string: Please add strlcpy and strlcat (attached)
187 [14697] nptl: Behavior of exit is nonconformant with respect to
189 [15142] stdio: Missing locking in _IO_cleanup
190 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
191 [18906] stdio: fopen: ccs value may affect open mode
192 [24466] stdio: Feature request: provide special printf formats for
194 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
195 [28519] libc: system and popen should pass "--" between /bin/sh and
197 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
198 [29591] string: wcsnlen length can overflow in page cross case.
199 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
200 [30068] stdio: incorrect printf output for integers with thousands
201 separator and width field (CVE-2023-25139)
202 [30111] time: support_descriptors_list fails after 2038 on 32 bits
204 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
205 symlink for libraries without soname
206 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
208 [30156] time: Potential ntp_gettime abi break
209 [30235] libc: Missing fallback in getlogin if loginuid is unset
210 [30258] dynamic-link: sprof cannot read and display shared object
211 profiling data correctly
212 [30263] libc: Add test coverage for abs(), labs(), and llabs().
213 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
214 [30402] libc: FAIL: elf/tst-glibcelf
215 [30425] dynamic-link: Symbol lookup during dlclose may fail
217 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
218 [30477] libc: [RISCV]: time64 does not work on riscv32
219 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
221 [30527] network: resolv_conf lock not unlocked on allocation failure
222 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
224 [30555] string: strerror can incorrectly return NULL
225 [30579] malloc: trim_threshold in realloc lead to high memory usage
226 [30662] nscd: Group and password cache use errno in place of errval
232 * The getent tool now supports the --no-addrconfig option. The output of
233 getent with --no-addrconfig may contain addresses of families not
234 configured on the current host i.e. as-if you had not passed
235 AI_ADDRCONFIG to getaddrinfo calls.
237 Deprecated and removed features, and other changes affecting compatibility:
239 * The dynamic linker no longer loads shared objects from the "tls"
240 subdirectories on the library search path or the subdirectory that
241 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
242 search mechanism, which was deprecated in version 2.33.
244 Security related changes:
246 CVE-2022-39046: When the syslog function is passed a crafted input
247 string larger than 1024 bytes, it reads uninitialized memory from the
248 heap and prints it to the target log file, potentially revealing a
249 portion of the contents of the heap.
251 The following bugs are resolved with this release:
253 [12154] network: Cannot resolve hosts which have wildcard aliases
254 [12165] libc: readdir: Do not skip entries with zero d_ino values
255 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
256 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
257 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
258 AF_INET6 address (ie docker)
259 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
261 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
262 [28937] dynamic-link: New DSO dependency sorter does not put new map
264 [29249] libc: csu/libc-tls.c:202: undefined reference to
265 `_startup_fatal_not_constant'
266 [29305] network: Inefficient buffer space usage in nss_dns for
267 gethostbyname and other functions
268 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
269 [29402] nscd: nscd: No such file or directory
270 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
272 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
273 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
275 [29463] math: math/test-float128-y1 fails on x86_64
276 [29485] build: Make hangs when the test misc/tst-pidfile returns
278 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
280 [29499] build: Check failed on misc/tst-glibcsyscalls while building
281 for RISCV64 on a unmatched hardware
282 [29501] build: Check failed on stdlib/tst-strfrom while building for
283 RISCV64 on a unmatched hardware
284 [29502] libc: alpha sys/acct.h out of date
285 [29514] build: Need to use -fPIE not -fpie
286 [29528] dynamic-link: __libc_early_init not called after dlmopen that
288 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
289 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
291 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
293 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
295 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
296 [29576] build: librtld.os: in function `_dl_start_profile':
297 (.text+0x9444): undefined reference to `strcpy'
298 [29578] libc: Definition of SUN_LEN() is wrong
299 [29583] build: iconv failures on 32bit platform due to missing large
301 [29600] dynamic-link: dlmopen hangs after loading certain libraries
302 [29604] localedata: Update locale data to Unicode 15.0.0
303 [29605] nscd: Regression in NSCD backend of getaddrinfo
304 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
306 [29611] string: Optimized AVX2 string functions unconditionally use
308 [29624] malloc: errno is not cleared when entering main
309 [29638] libc: stdlib: arc4random fallback is never used
310 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
312 [29698] build: Configuring for AArch32 on ARMv8+ disables
314 [29727] locale: __strtol_internal out-of-bounds read when parsing
316 [29730] libc: broken y2038 support in fstatat on MIPS N64
317 [29746] libc: ppoll() does not switch to __ppoll64 when
318 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
319 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
320 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
321 aux.S: No such file or directory)
322 [29864] libc: __libc_start_main() should obtain program headers
323 address (_dl_phdr) from the auxv, not the ELF header.
324 [29951] time: daylight variable not set correctly if last DST change
325 coincides with offset change
326 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
327 length in fortify mode
333 * Support for DT_RELR relative relocation format has been added to
334 glibc. This is a new ELF dynamic tag that improves the size of
335 relative relocations in shared object files and position independent
336 executables (PIE). DT_RELR generation requires linker support for
337 -z pack-relative-relocs option, which is supported for some targets
338 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
340 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
341 have been added. The pidfd functionality provides access to a process
342 while avoiding the issue of PID reuse on traditional Unix systems.
344 * On Linux, the process_madvise function has been added. It has the
345 same functionality as madvise but alters the target process identified
348 * On Linux, the process_mrelease function has been added. It allows a
349 caller to release the memory of a dying process. The release of the
350 memory is carried out in the context of the caller, using the caller's
351 CPU affinity, and priority with CPU usage accounted to the caller.
353 * The “no-aaaa” DNS stub resolver option has been added. System
354 administrators can use it to suppress AAAA queries made by the stub
355 resolver, including AAAA lookups triggered by NSS-based interfaces
356 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
357 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
358 produce IPv6 addresses, and configured IPv6 name servers are still
359 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
360 are translated to A queries. The new resolver option is intended
361 primarily for diagnostic purposes, to rule out that AAAA DNS queries
362 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
363 validation by applications.
365 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
366 and mount_setattr have been added. They are part of the new Linux kernel
367 mount APIs that allow applications to more flexibly configure and operate
368 on filesystem mounts. The new mount APIs are specifically designed to work
371 * localedef now accepts locale definition files encoded in UTF-8.
372 Previously, input bytes not within the ASCII range resulted in
373 unpredictable output.
375 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
376 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
377 Support for the char8_t typedef has been added per the ISO C2X N2653
378 proposal. The functions are declared in uchar.h in C2X mode or when the
379 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
380 The char8_t typedef is declared in uchar.h in C2X mode or when the
381 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
382 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
384 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
385 added. The functions wrap getrandom and/or /dev/urandom to return high-
386 quality randomness from the kernel.
388 * Support for LoongArch running on Linux has been added. This port requires
389 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
392 - loongarch64-linux-gnu
394 The LoongArch ABI is 64-bit little-endian.
396 Deprecated and removed features, and other changes affecting compatibility:
398 * Support for prelink will be removed in the next release; this includes
399 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
400 variables and their functionality in the dynamic loader.
402 * The Linux kernel version check has been removed along with the
403 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
404 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
405 when libc.so is issued directly.
407 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
409 The following bugs are resolved with this release:
411 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
412 return different result with versioned "foo"
413 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
415 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
416 ./exe and ld.so adjusts argv on the stack
417 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
419 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
420 consuming the second byte of certain double byte characters
421 [25812] stdio: Libio vtable protection is sometimes only partially
423 [27054] libc: pthread_atfork handlers that call pthread_atfork
425 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
427 [28128] build: declare_symbol_alias doesn't work for assembly codes
428 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
429 [28752] nss: Segfault in getpwuid when stat fails
430 [28815] libc: realpath should not copy to resolved buffer on error
431 [28828] stdio: fputwc crashes
432 [28838] libc: FAIL: elf/tst-p_align3
433 [28845] locale: ld-monetary.c should be updated to match ISO C and
435 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
437 [28852] libc: getaddrinfo leaks memory with AI_ALL
438 [28853] libc: tst-spawn6 changes current foreground process group
439 (breaks test isolation)
440 [28857] libc: FAIL: elf/tst-audit24a
441 [28860] build: --enable-kernel=5.1.0 build fails because of missing
442 __convert_scm_timestamps
443 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
444 inaccurate without /sys and /proc
445 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
447 [28880] libc: Program crashes if date beyond 2038
448 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
449 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
450 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
451 rtm variants when avoiding overflow
452 [28922] build: The .d dependency files aren't always generated
453 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
455 [28936] build: nm: No such file
456 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
457 [28953] nss: NSS lookup result can be incorrect if function lookup
459 [28970] math: benchtest: libmvec benchmark doesn't build with make
461 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
462 /sys/devices/system/cpu/possible
463 [28993] libc: closefrom() iterates until max int if no access to
465 [28996] libc: realpath fails to copy partial result to resolved buffer
467 [29027] math: [ia64] fabs fails with sNAN input
468 [29029] nptl: poll() spuriously returns EINTR during thread
469 cancellation and with cancellation disabled
470 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
471 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
472 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
473 is promoted to global scope
474 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
475 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
476 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
478 [29097] time: fchmodat does not handle 64 bit time_t for
480 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
482 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
483 [29162] string: [PATCH] string.h syntactic error:
484 include/bits/string_fortified.h:110: error: expected ',' or ';'
485 before '__fortified_attr_access'
486 [29165] libc: [Regression] broken argv adjustment
487 [29187] dynamic-link: [regression] broken argv adjustment for nios2
488 [29193] math: sincos produces a different output than sin/cos
489 [29197] string: __strncpy_power9() uses uninitialised register vs18
490 value for filling after \0
491 [29203] libc: daemon is not y2038 aware
492 [29204] libc: getusershell is not 2038 aware
493 [29207] libc: posix_fallocate fallback implementation is not y2038
495 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
496 [29209] libc: isfdtype is not y2038 aware
497 [29210] network: ruserpass is not y2038 aware
498 [29211] libc: __open_catalog is not y2038 aware
499 [29213] libc: gconv_parseconfdir is not y2038 aware
500 [29214] nptl: pthread_setcanceltype fails to set type
501 [29225] network: Mistyped define statement in socket/sys/socket.h in
503 [29274] nptl: __read_chk is not a cancellation point
504 [29279] libc: undefined reference to `mbstowcs_chk' after
505 464d189b9622932a75302290625de84931656ec0
506 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
507 correct for !__ASSUME_TIME64_SYSCALLS
508 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
509 missing on microblaze with largefile
515 * Unicode 14.0.0 Support: Character encoding, character type info, and
516 transliteration tables are all updated to Unicode 14.0.0, using
517 generator scripts contributed by Mike FABIAN (Red Hat).
519 * Bump r_version in the debugger interface to 2 and add a new field,
520 r_next, support multiple namespaces.
522 * Support for the C.UTF-8 locale has been added to glibc. The locale
523 supports full code-point sorting for all valid Unicode code points. A
524 limitation in the framework for fnmatch, regexec, and regcomp requires
525 a compromise to save space and only ASCII-based range expressions are
526 supported for now (see bug 28255). The full size of the locale is
527 only ~400KiB, with 346KiB coming from LC_CTYPE information for
528 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
529 in various downstream distributions. The locale is not built into
530 glibc, and must be installed.
532 * <math.h> functions that round their results to a narrower type, and
533 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
534 18661-3:2015 and draft ISO C2X:
536 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
537 fMxsqrtfN and fMxsqrtfNx functions.
539 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
542 * <math.h> functions for floating-point maximum and minimum,
543 corresponding to new operations in IEEE 754-2019, and corresponding
544 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
545 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
546 fminimum_mag, fminimum_mag_num and corresponding functions for float,
547 long double, _FloatN and _FloatNx.
549 * <math.h> macros for single-precision float constants are added as a
550 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
551 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
554 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
555 predefined as specified in TS 18661-1:2014.
557 * The exp10 functions in <math.h> now have a corresponding type-generic
560 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
562 * printf-family functions now support the %b format for output of
563 integers in binary, as specified in draft ISO C2X, and the %B variant
564 of that format recommended by draft ISO C2X.
566 * A new DSO sorting algorithm has been added in the dynamic linker that uses
567 topological sorting by depth-first search (DFS), solving performance issues
568 of the existing sorting algorithm when encountering particular circular
569 object dependency cases.
571 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
572 the two DSO sorting algorithms. The default setting of '2' uses the
573 new DFS-based algorithm. The setting '1' switches to the old
574 algorithm used in glibc 2.33 and earlier.
576 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
577 to be used by compilers for optimizing usage of 'memcmp' when its
578 return value is only used for its boolean status.
580 * Support for automatically registering threads with the Linux rseq
581 system call has been added. This system call is implemented starting
582 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
583 operations on per-cpu data. It allows user-space to perform updates
584 on per-cpu data without requiring heavy-weight atomic operations.
585 Automatically registering threads allows all libraries, including
586 libc, to make immediate use of the rseq support by using the
587 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
588 variables. The GNU C Library manual has details on integration of
589 Restartable Sequences.
591 * A symbolic link to the dynamic linker is now installed under
592 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
594 * All programs and the testsuite in glibc are now built as position independent
595 executables (PIE) by default on toolchains and architectures that support it.
596 Further, if the toolchain and architecture supports it, even static programs
597 are built as PIE and the resultant glibc can be used to build static PIE
598 executables. A new option --disable-default-pie has been added to disable
599 this behavior and get a non-PIE build. This option replaces
600 --enable-static-pie, which no longer has any effect on the build
603 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
604 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
605 or to use huge pages directly with mmap calls with the MAP_HUGETLB
606 flags). The former can improve performance when Transparent Huge Pages
607 is set to 'madvise' mode while the latter uses the system reserved
610 * The printf family of functions now handles the flagged %#m conversion
611 specifier, printing errno as an error constant (similar to strerrorname_np).
613 * The function _dl_find_object has been added. In-process unwinders
614 can use it to efficiently locate unwinding information for a code
617 * Support for OpenRISC running on Linux has been added. This port requires
618 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
623 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
624 64-bit file offsets (LFS default).
626 * A new configure option, --with-rtld-early-cflags, can be used to
627 specify additional compiler flags for building the early startup code
628 of the dynamic linker. On targets which have CPU compatibility
629 checks, this can help to ensure that proper diagnostics are printed if
630 the dynamic loader runs on an incompatible CPU.
632 * On Linux, the epoll_pwait2 function has been added. It is similar to
633 epoll_wait with the difference the timeout has nanoseconds resolution.
635 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
636 enabling posix_spawn and posix_spawnp to set the controlling terminal in
637 the new process in a race free manner. This function is a GNU extension.
639 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
640 applications compiling with glibc and gcc 12 and later. Level 3 leverages
641 the __builtin_dynamic_object_size function to deliver additional
642 fortification balanced against additional runtime cost (checking non-constant
645 * The audit libraries will avoid unnecessary slowdown if it is not required
646 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
648 Deprecated and removed features, and other changes affecting compatibility:
650 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
651 has been removed since the first PT_LOAD segment is no longer executable
652 due to defaulting to -z separate-code.
654 * The r_version update in the debugger interface makes the glibc binary
655 incompatible with GDB binaries built without the following commits:
657 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
658 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
660 when audit modules or dlmopen are used.
662 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
664 * The --enable-static-pie option is no longer available. The glibc build
665 configuration script now automatically detects static-pie support in the
666 toolchain and architecture and enables it if available.
668 * The catchsegv script and associated libSegFault.so shared object have
669 been removed. There are widely-deployed out-of-process alternatives for
670 catching coredumps and backtraces.
672 * Support for prelink will be removed in the next release; this includes
673 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
674 variables and their functionality in the dynamic loader.
676 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
677 functionality to obtain the program mapping address can be achieved by
678 using LD_TRACE_LOADED_OBJECTS to value of 2.
680 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
681 support prelink PIE binaries.
683 Changes to build and runtime requirements:
685 * The audit module interface version LAV_CURRENT is increased to enable
686 proper bind-now support. The loader now advertises via the la_symbind
687 flags that PLT trace is not possible. New audit modules require the
688 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
689 modules are still loaded for all targets except aarch64.
691 * The audit interface on aarch64 is extended to support both the indirect
692 result location register (x8) and NEON Q register. Old audit modules are
693 rejected by the loader. Audit modules must be rebuilt to use the newer
694 structure sizes and the latest module interface version for LAV_CURRENT.
696 Security related changes:
698 CVE-2022-23219: Passing an overlong file name to the clnt_create
699 legacy function could result in a stack-based buffer overflow when
700 using the "unix" protocol. Reported by Martin Sebor.
702 CVE-2022-23218: Passing an overlong file name to the svcunix_create
703 legacy function could result in a stack-based buffer overflow.
705 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
706 function could result in a memory leak and potential access of
707 uninitialized memory. Reported by Qualys.
709 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
710 function may result in an off-by-one buffer underflow and overflow
711 when the current working directory is longer than PATH_MAX and also
712 corresponds to the / directory through an unprivileged mount
713 namespace. Reported by Qualys.
715 The following bugs are resolved with this release:
717 [12889] nptl: Race condition in pthread_kill
718 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
719 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
720 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
722 [15333] libc: Use 64-bit stat functions in installed programs
723 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
725 [15971] dynamic-link: No interface for debugger access to libraries
727 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
728 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
729 deeply nested DSO dependencies.
730 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
731 ID whose lifetime has not ended
732 [22542] network: buffer overflow in sunrpc clnt_create
734 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
736 [25947] malloc: memory leak in muntrace
737 [26045] math: fmaxf(inf, nan) does not always work
738 [26108] math: exp10() has problems with <tgmath.h>
739 [26779] build: benign use after realloc at localealias.c:329
740 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
741 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
742 [27945] build: build-many-glibcs.py doesn't configure GCC with
743 --enable-initfini-array
744 [27991] build: x86: sysdeps/x86/configure.ac breaks when
745 libc_cv_include_x86_isa_level is loaded from cache
746 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
747 in __REDIRECT_NTH macro
748 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
749 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
751 [28126] libc: nftw aborts for paths longer than PATH_MAX
752 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
753 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
755 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
756 [28185] math: Inaccurate j0f function (again)
757 [28199] locale: iconvconfig prefix flag behaves differently in glibc
759 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
760 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
762 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
763 [28223] libc: mips: clone does not align stack
764 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
766 [28256] malloc: Conditional jump or move depends on uninitialised
767 value(s) in __GI___tunables_init
768 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
769 spawn5 fail if stray fds are open
770 [28310] libc: Do not use affinity mask for sysconf
771 (_SC_NPROCESSORS_CONF)
772 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
774 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
776 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
777 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
779 [28353] network: Race condition on __opensock
780 [28357] dynamic-link: deadlock between pthread_create and ctors
781 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
782 [28361] nptl: Fix for bug 12889 causes setxid deadlock
783 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
784 [28390] localedata: Update locale data to Unicode 14.0.0
785 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
787 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
789 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
790 to tgkill (getpid (), gettid())
791 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
792 [28457] dynamic-link: Missing reldepmod4.so dependency for
794 [28469] time: linux: struct timex is not correctly set for 32-bit
795 systems with TIMESIZE=64
796 [28470] regex: Buffer read overrun in regular expression searching
797 [28475] string: Incorrect access attribute on memfrob
798 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
799 spurious NUL character on state reset
800 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
802 [28550] dynamic-link: FAIL: tst-dso-
803 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
805 [28554] build: Undefined generate-md5
806 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
808 [28607] nptl: Masked signals are delivered on thread exit
809 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
810 lack of cpu counting /proc fallback with glibc 2.34
811 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
812 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
813 [28648] dynamic-link: Running ld.so on statically linked binaries
815 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
817 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
818 [28678] nptl: nptl/tst-create1 hangs sporadically
819 [28688] dynamic-link: PT_LOAD p_align check is too strict
820 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
822 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
823 timezones generated by tzcode-2021d and later
824 [28713] math: GCC 12 miscompiles libm
825 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
826 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
827 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
828 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
829 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
830 Assertion `GL(dl_rtld_map).l_libname' failed!
831 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
832 [28757] nptl: GDB printer tests failed with new GDB
833 [28765] math: x86_64 libmvec atan2 accuracy
834 [28766] manual: Document libmvec accuracy
835 [28768] network: Buffer overflow in svcunix_create with long pathnames
837 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
839 [28770] libc: Unexpected return value from realpath() for too long
840 results (CVE-2021-3998)
841 [28771] libc: %ebx optimization macros are incompatible with .altmacro
843 [28780] build: --disable-default-pie doesn't work on static programs
844 [28782] libc: x86-64 ISA level for glibc itself is always
846 [28792] glob: possible wrong behaviour with patterns with double [
848 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
849 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
850 empty mon_decimal_point_wc
857 * In order to support smoother in-place-upgrades and to simplify
858 the implementation of the runtime all functionality formerly
859 implemented in the libraries libpthread, libdl, libutil, libanl has
860 been integrated into libc. New applications do not need to link with
861 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
862 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
863 provided, so that the linker options keep working. Applications which
864 have been linked against glibc 2.33 or earlier continue to load the
865 corresponding shared objects (which are now empty). The integration
866 of those libraries into libc means that additional symbols become
867 available by default. This can cause applications that contain weak
868 references to take unexpected code paths that would only have been
869 used in previous glibc versions when e.g. preloading libpthread.so.0,
870 potentially exposing application bugs.
872 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
873 PTHREAD_STACK_MIN is no longer constant and is redefined to
874 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
875 sets for modern architectural features like Arm SVE.
877 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
878 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
879 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
880 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
881 dynamic sized register sets for modern architectural features like
884 * The dynamic linker implements the --list-diagnostics option, printing
885 a dump of information related to IFUNC resolver operation and
886 glibc-hwcaps subdirectory selection.
888 * On Linux, the function execveat has been added. It operates similar to
889 execve and it is is already used to implement fexecve without requiring
890 /proc to be mounted. However, different than fexecve, if the syscall is not
891 supported by the kernel an error is returned instead of trying a fallback.
893 * The ISO C2X function timespec_getres has been added.
895 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
896 C2X, is supported to enable declarations of functions defined in Annex F
897 of C2X. Those declarations are also enabled when
898 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
899 defined, and when _GNU_SOURCE is defined.
901 * On powerpc64*, glibc can now be compiled without scv support using the
902 --disable-scv configure option.
904 * Add support for 64-bit time_t on configurations like x86 where time_t
905 is traditionally 32-bit. Although time_t still defaults to 32-bit on
906 these configurations, this default may change in future versions.
907 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
908 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
909 only enabled for Linux and the full support requires a minimum kernel
912 * The main gconv-modules file in glibc now contains only a small set of
913 essential converter modules and the rest have been moved into a supplementary
914 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
915 in the same GCONV_PATH. Similarly, external converter modules directories
916 may have supplementary configuration files in a gconv-modules.d directory
917 with names ending with .conf to logically classify the converter modules in
920 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
921 to configure the size of the thread stack cache.
923 * The function _Fork has been added as an async-signal-safe fork replacement
924 since Austin Group issue 62 dropped the async-signal-safe requirement for
925 fork (and it will be included in the future POSIX standard). The new _Fork
926 function does not run any atfork function neither resets any internal state
927 or lock (such as the malloc one), and only sets up a minimal state required
928 to call async-signal-safe functions (such as raise or execve). This function
929 is currently a GNU extension.
931 * On Linux, the close_range function has been added. It allows efficiently
932 closing a range of file descriptors on recent kernels (version 5.9).
934 * The function closefrom has been added. It closes all file descriptors
935 greater than or equal to a given integer. This function is a GNU extension,
936 although it is also present in other systems.
938 * The posix_spawn_file_actions_addclosefrom_np function has been added,
939 enabling posix_spawn and posix_spawnp to close all file descriptors greater
940 than or equal to a given integer. This function is a GNU extension,
941 although Solaris also provides a similar function.
943 * When invoked explicitly, the dynamic linker now uses the kernel to
944 execute programs that do not have any dynamic dependency (that is,
945 they are statically linked). This feature is Linux-specific.
947 Deprecated and removed features, and other changes affecting compatibility:
949 * The function pthread_mutex_consistent_np has been deprecated; programs
950 should use the equivalent standard function pthread_mutex_consistent
953 * The function pthread_mutexattr_getrobust_np has been deprecated;
954 programs should use the equivalent standard function
955 pthread_mutexattr_getrobust instead.
957 * The function pthread_mutexattr_setrobust_np has been deprecated;
958 programs should use the equivalent standard function
959 pthread_mutexattr_setrobust instead.
961 * The function pthread_yield has been deprecated; programs should use
962 the equivalent standard function sched_yield instead.
964 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
966 * Various rarely-used functions declared in <resolv.h> and
967 <arpa/nameser.h> have been deprecated. Applications are encouraged to
968 use dedicated DNS processing libraries if applicable. For <resolv.h>,
969 this affects the functions dn_count_labels, fp_nquery, fp_query,
970 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
971 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
972 p_type, putlong, putshort, res_hostalias, res_isourserver,
973 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
974 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
975 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
976 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
978 * Various symbols previously defined in libresolv have been moved to libc
979 in order to prepare for libresolv moving entirely into libc (see earlier
980 entry for merging libraries into libc). The symbols __dn_comp,
981 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
982 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
983 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
984 __res_search, __res_send formerly in libresolv have been renamed and no
985 longer have a __ prefix. They are now available in libc.
987 * The pthread cancellation handler is now installed with SA_RESTART and
988 pthread_cancel will always send the internal SIGCANCEL on a cancellation
989 request. It should not be visible to applications since the cancellation
990 handler should either act upon cancellation (if asynchronous cancellation
991 is enabled) or ignore the cancellation internal signal. However there are
992 buggy kernel interfaces (for instance some CIFS versions) that could still
993 see a spurious EINTR error when cancellation interrupts a blocking syscall.
995 * Previously, glibc installed its various shared objects under versioned
996 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
997 were provided as symbolic links. Starting with glibc 2.34, the shared
998 objects are installed under their ABI sonames directly, without
999 symbolic links. This increases compatibility with distribution
1000 package managers that delete removed files late during the package
1001 upgrade or downgrade process.
1003 * The symbols mallwatch and tr_break are now deprecated and no longer used in
1004 mtrace. Similar functionality can be achieved by using conditional
1005 breakpoints within mtrace functions from within gdb.
1007 * The __morecore and __after_morecore_hook malloc hooks and the default
1008 implementation __default_morecore have been removed from the API. Existing
1009 applications will continue to link against these symbols but the interfaces
1010 no longer have any effect on malloc.
1012 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
1013 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
1014 disabled by default in the main C library. Users looking to use these
1015 features now need to preload a new debugging DSO libc_malloc_debug.so to get
1016 this functionality back.
1018 * The deprecated functions malloc_get_state and malloc_set_state have been
1019 moved from the core C library into libc_malloc_debug.so. Legacy applications
1020 that still use these functions will now need to preload libc_malloc_debug.so
1021 in their environment using the LD_PRELOAD environment variable.
1023 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
1024 __memalign_hook and __free_hook are now removed from the API. Compatibility
1025 symbols are present to support legacy programs but new applications can no
1026 longer link to these symbols. These hooks no longer have any effect on glibc
1027 functionality. The malloc debugging DSO libc_malloc_debug.so currently
1028 supports hooks and can be preloaded to get this functionality back for older
1029 programs. However this is a transitional measure and may be removed in a
1030 future release of the GNU C Library. Users may port away from these hooks by
1031 writing and preloading their own malloc interposition library.
1033 Changes to build and runtime requirements:
1035 * On Linux, the shm_open, sem_open, and related functions now expect the
1036 file shared memory file system to be mounted at /dev/shm. These functions
1037 no longer search among the system's mount points for a suitable
1038 replacement if /dev/shm is not available.
1040 Security related changes:
1042 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1043 a request for netgroup lookup, may crash due to a double-free,
1044 potentially resulting in degraded service or Denial of Service on the
1045 local system. Reported by Chris Schanzle.
1047 CVE-2021-33574: The mq_notify function has a potential use-after-free
1048 issue when using a notification type of SIGEV_THREAD and a thread
1049 attribute with a non-default affinity mask.
1051 CVE-2021-35942: The wordexp function may overflow the positional
1052 parameter number when processing the expansion resulting in a crash.
1053 Reported by Philippe Antoine.
1055 The following bugs are resolved with this release:
1057 [4737] libc: fork is not async-signal-safe
1058 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1059 [10353] libc: Methods for deleting all file descriptors greater than
1060 given integer (closefrom)
1061 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1062 name containing multi-byte character(s)
1063 [14469] math: Inaccurate j0f function
1064 [14470] math: Inaccurate j1f function
1065 [14471] math: Inaccurate y0f function
1066 [14472] math: Inaccurate y1f function
1067 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1069 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1070 crashes if it fails dlsym() twice
1071 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1072 [16063] nptl: Provide a pthread_once variant in libc directly
1073 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1074 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1075 [17183] manual: description of ENTRY struct in <search.h> in glibc
1077 [18435] nptl: pthread_once hangs when init routine throws an exception
1078 [18524] nptl: Missing calloc error checking in
1079 __cxa_thread_atexit_impl
1080 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1081 pthread_create and dlopen
1082 [19366] nptl: returning from a thread should disable cancellation
1083 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1084 when non-root user changes priority
1085 [20802] dynamic-link: getauxval NULL pointer dereference after static
1087 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1088 [22057] malloc: malloc_usable_size is broken with mcheck
1089 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1091 [23323] libc: [RFE] CSU startup hardening.
1092 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1094 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1095 $PLATFORM, $ORIGIN) crashes
1096 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1097 [23554] nptl: pthread_getattr_np reports wrong stack size with
1099 [24106] libc: Bash interpreter in ldd script is taken from host
1100 [24773] dynamic-link: dlerror in an secondary namespace does not use
1101 the right free implementation
1102 [25036] localedata: Update collation order for Swedish
1103 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1104 shm_open to pick wrong directory
1105 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1106 crash in IFUNC resolver due to stack canary (--enable-stack-
1108 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1109 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1110 [27111] dynamic-link: pthread_create and tls access use link_map
1111 objects that may be concurrently freed by dlclose
1112 [27132] malloc: memusagestat is linked to system librt, leading to
1113 undefined symbols on major version upgrade
1114 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1116 [27249] libc: libSegFault.so does not output signal number properly
1117 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1119 [27318] dynamic-link: glibc fails to load binaries when built with
1120 -march=sandybridge: CPU ISA level is lower than required
1121 [27343] nss: initgroups() SIGSEGVs when called on a system without
1122 nsswich.conf (in a chroot)
1123 [27346] dynamic-link: x86: PTWRITE feature check is missing
1124 [27389] network: NSS chroot hardening causes regressions in chroot
1126 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1127 [27444] libc: sysconf reports unsupported option (-1) for
1128 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1129 [27462] nscd: double-free in nscd (CVE-2021-27645)
1130 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1131 malloc/tst-malloc-thread-fail
1132 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1133 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1135 [27522] glob: glob, glob64 incorrectly marked as __THROW
1136 [27555] dynamic-link: Static tests fail with --enable-stack-
1138 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1139 information for the current directory
1140 [27577] dynamic-link: elf/ld.so --help doesn't work
1141 [27605] libc: tunables can't control xsave/xsavec selection in
1142 dl_runtime_resolve_*
1143 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1144 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1146 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1147 _nss_files_getcanonname_r) from within a dlmopen namespace.
1148 [27648] libc: FAIL: misc/tst-select
1149 [27650] stdio: vfscanf returns too early if a match is longer than
1151 [27651] libc: Performance regression after updating to 2.33
1152 [27655] string: Wrong size calculation in string/test-strnlen.c
1153 [27706] libc: select fails to update timeout on error
1154 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1155 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1156 tries resolving them lazily
1157 [27744] nptl: Support different libpthread/ld.so load orders in
1159 [27749] libc: Data race __run_exit_handlers
1160 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1162 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1163 exceeds maximum object size 2147483647
1164 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1166 [27872] build: Obsolete configure option --enable-stackguard-
1168 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1169 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1170 [27892] libc: powerpc: scv ABI error handling fails to check
1172 [27896] nptl: mq_notify does not handle separately allocated thread
1173 attributes (CVE-2021-33574)
1174 [27901] libc: TEST_STACK_ALIGN doesn't work
1175 [27902] libc: The x86-64 clone wrapper fails to align child stack
1176 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1177 [27939] libc: aarch64: clone does not align the stack
1178 [27968] libc: s390x: clone does not align the stack
1179 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1180 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1181 with n >= 0x80000000
1182 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1183 thread never allocated anything
1184 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1185 [28064] string: x86_64:wcslen implementation list has wcsnlen
1186 [28067] libc: FAIL: posix/tst-spawn5
1187 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1188 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1190 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1191 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1192 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1194 [28091] network: ns_name_skip may return 0 for domain names without
1202 * The dynamic linker accepts the --list-tunables argument which prints
1203 all the supported tunables. This option is disable if glibc is
1204 configured with tunables disabled (--enable-tunables=no).
1206 * The dynamic linker accepts the --argv0 argument and provides opportunity
1207 to change argv[0] string.
1209 * The dynamic linker loads optimized implementations of shared objects
1210 from subdirectories under the glibc-hwcaps directory on the library
1211 search path if the system's capabilities meet the requirements for
1212 that subdirectory. Initially supported subdirectories include
1213 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1214 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1215 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1216 subdirectory names correspond to the vendor-independent x86-64
1217 microarchitecture levels defined in the x86-64 psABI supplement.
1219 * The new --help option of the dynamic linker provides usage and
1220 information and library search path diagnostics.
1222 * The mallinfo2 function is added to report statistics as per mallinfo,
1223 but with larger field widths to accurately report values that are
1224 larger than fit in an integer.
1226 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1228 * Support for the RISC-V ISA running on Linux has been expanded to run on
1229 32-bit hardware. This is supported for the following ISA and ABI pairs:
1235 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1238 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1239 glibc may use additional checks that may have an additional performance
1240 overhead. At present these checks are available only on LLVM 9 and later.
1241 The latest GCC available at this time (10.2) does not support this level of
1244 Deprecated and removed features, and other changes affecting compatibility:
1246 * The mallinfo function is marked deprecated. Callers should call
1249 * When dlopen is used in statically linked programs, alternative library
1250 implementations from HWCAP subdirectories are no longer loaded.
1251 Instead, the default implementation is used.
1253 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1254 removed. To support old binaries, the vtimes function continues to exist
1255 as a compatibility symbol. Applications should use the getrlimit or
1258 * Following a change in the tzdata 2018a release upstream, the zdump
1259 program is now installed in the /usr/bin subdirectory. Previously,
1260 the /usr/sbin subdirectory was used.
1262 * On s390(x), the type float_t is now derived from the macro
1263 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1264 hardcoded to double. This does not affect the ABI of any libraries
1265 that are part of the GNU C Library, but may affect the ABI of other
1266 libraries that use this type in their interfaces. The new definition
1267 improves consistency with compiler behavior in many scenarios.
1269 * A future version of glibc will stop loading shared objects from the
1270 "tls" subdirectories on the library search path, the subdirectory that
1271 corresponds to the AT_PLATFORM system name, and also stop employing
1272 the legacy AT_HWCAP search mechanism. Applications should switch to
1273 the new glibc-hwcaps mechanism instead; if they do not do that, only
1274 the baseline version (directly from the search path directory) will be
1277 Changes to build and runtime requirements:
1279 * On Linux, the system administrator needs to configure /dev/pts with
1280 the intended access modes for pseudo-terminals. glibc no longer
1281 attempts to adjust permissions of terminal devices. The previous glibc
1282 defaults ("tty" group, user read/write and group write) already
1283 corresponded to what most systems used, so that grantpt did not
1284 perform any adjustments.
1286 * On Linux, the posix_openpt and getpt functions no longer attempt to
1287 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1288 (and pseudo-terminals are supported), a devpts file system is mounted
1289 on /dev/pts. Current systems already meet these requirements.
1291 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1293 Security related changes:
1295 CVE-2021-3326: An assertion failure during conversion from the
1296 ISO-20220-JP-3 character set using the iconv function has been fixed.
1297 This assertion was triggered by certain valid inputs in which the
1298 converted output contains a combined sequence of two wide characters
1299 crossing a buffer boundary. Reported by Tavis Ormandy.
1301 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1302 invoked with input containing redundant shift sequences in the IBM1364,
1303 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1305 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1306 when invoked with UCS4 input containing an invalid character.
1308 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1309 invoked with EUC-KR input containing invalid multibyte input sequences.
1311 The following bugs are resolved with this release:
1313 [10635] libc: realpath portability patches
1314 [16124] dynamic-link: ld.so should allow to change argv[0]
1315 [17924] malloc: 'free' should not set errno
1316 [18683] libc: Linux faccessat implementation can incorrectly ignore
1318 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1319 [23091] hurd: missing waitid support
1320 [23249] libc: Epyc and other current AMD CPUs do not select the
1321 "haswell" platform subdirectory
1322 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1324 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1326 [24941] libc: Make grantpt usable after multi-threaded fork in more
1328 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1329 [24973] locale: iconv encounters segmentation fault when converting
1330 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1331 [25399] string: undefined reference to `__warn_memset_zero_len' when
1332 changing gnuc version
1333 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1335 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1337 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1338 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1339 [26100] libc: Race in syslog(3) with regards to tag printing.
1340 [26124] libc: Export <cpu-features.h>
1341 [26130] nscd: Inconsistent nscd cache during pruning
1342 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1343 [26224] locale: iconv hangs when converting some invalid inputs from
1344 several IBM character sets (CVE-2020-27618)
1345 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1346 too much stack space
1347 [26343] manual: invalid documented return type for strerrorname_np(),
1348 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1349 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1351 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1353 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1354 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1356 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1357 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1358 [26555] string: strerrorname_np does not return the documented value
1359 [26592] libc: pointer arithmetic overflows in realpath
1360 [26600] network: Transaction ID collisions cause slow DNS lookups in
1362 [26606] libc: [2.33 Regression] pselect is broken on x32
1363 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1364 [26620] glob: fnmatch with collating symbols results in segmentation
1366 [26625] libc: [2.33 Regression] CET is disabled
1367 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1368 at the end of a memory mapping
1369 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1370 by the caller to the kernel
1371 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1372 [26647] build: [-Werror=array-parameter=] due to different
1373 declarations for __sigsetjmp
1374 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1376 [26649] stdio: printf should handle non-normal x86 long double numbers
1377 gracefully (CVE-2020-29573)
1378 [26686] build: -Warray-parameter instances building with GCC 11
1379 [26687] build: -Warray-bounds instances building with GCC 11
1380 [26690] stdio: Aliasing violation in __vfscanf_internal
1381 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1382 [26726] build: GCC warning calling new_composite_name with an array of
1384 [26736] libc: FAIL: misc/tst-sysvshm-linux
1385 [26737] libc: Random FAIL: rt/tst-shm
1386 [26791] libc: Missing O_CLOEXEC in sysconf.c
1387 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1389 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1391 [26818] string: aarch64: string tests may run ifunc variants that are
1393 [26821] libc: Memory leak test failures on Fedora 33
1394 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1395 FSGSBASE/LM/RDRAND check failure
1396 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1398 [26853] libc: aarch64: Missing unwind information in statically linked
1400 [26923] locale: Assertion failure in iconv when converting invalid
1401 UCS4 (CVE-2020-29562)
1402 [26926] dynamic-link: aarch64: library dependencies are not bti
1404 [26932] libc: sh: Multiple floating point functions defined as stubs
1406 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1408 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1410 [27002] build: libc_freeres_fn build failure with GCC 11
1411 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1412 [27008] dynamic-link: ld.so.cache should have endianness markup
1413 [27042] libc: [alpha] anonymous union in struct stat confuses
1415 [27053] libc: Conformance regression in system(3) (and probably also
1417 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1419 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1420 [27083] libc: Unsafe unbounded alloca in addmntent
1421 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1423 [27130] string: "rep movsb" performance issue
1424 [27150] libc: alpha: wait4() is unavailable in static linking
1425 [27177] dynamic-link:
1426 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1428 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1429 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1430 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1431 related to combining characters (CVE-2021-3326)
1438 * Unicode 13.0.0 Support: Character encoding, character type info, and
1439 transliteration tables are all updated to Unicode 13.0.0, using
1440 generator scripts contributed by Mike FABIAN (Red Hat).
1442 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1444 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1445 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1446 Three ABIs are supported:
1452 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1453 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1455 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1456 DT_DEPAUDIT dynamic section entries of the main executable.
1458 * powerpc64le supports IEEE128 long double libm/libc redirects when
1459 using -mabi=ieeelongdouble to compile C code on supported GCC
1460 toolchains. It is recommended to use GCC 8 or newer when testing
1463 * To help detect buffer overflows and other out-of-bounds accesses
1464 several APIs have been annotated with GCC 'access' attribute. This
1465 should help GCC 10 issue better warnings.
1467 * On Linux, functions pthread_attr_setsigmask_np and
1468 pthread_attr_getsigmask_np have been added. They allow applications
1469 to specify the signal mask of a thread created with pthread_create.
1471 * The GNU C Library now provides the header file <sys/single_threaded.h>
1472 which declares the variable __libc_single_threaded. Applications are
1473 encouraged to use this variable for single-thread optimizations,
1474 instead of weak references to symbols historically defined in
1477 * The functions sigabbrev_np and sigdescr_np have been added. The
1478 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1479 SIGHUP) while sigdescr_np returns a string describing the signal number
1480 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1481 attempt to translate the return description, both functions return
1482 NULL for an invalid signal number.
1484 They should be used instead of sys_siglist or sys_sigabbrev and they
1485 are both thread and async-signal safe. These functions are GNU extensions.
1487 * The functions strerrorname_np and strerrordesc_np have been added. The
1488 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1489 while strerrordesc_np returns a string describing the error number
1490 (e.g "Invalid argument" for EINVAL). Different than strerror,
1491 strerrordesc_np does not attempt to translate the return description, both
1492 functions return NULL for an invalid error number.
1494 They should be used instead of sys_errlist and sys_nerr, both are
1495 thread and async-signal safe. These functions are GNU extensions.
1497 * AArch64 now supports standard branch protection security hardening
1498 in glibc when it is built with a GCC that is configured with
1499 --enable-standard-branch-protection (or if -mbranch-protection=standard
1500 flag is passed when building both GCC target libraries and glibc,
1501 in either case a custom GCC is needed). This includes branch target
1502 identification (BTI) and pointer authentication for return addresses
1503 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1504 extensions respectively for the protection to be effective,
1505 otherwise the used instructions are nops. User code can use PAC-RET
1506 without libc support, but BTI requires a libc that is built with BTI
1507 support, otherwise runtime objects linked into user code will not be
1510 Deprecated and removed features, and other changes affecting compatibility:
1512 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1513 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1514 RPC header files. Backward compatibility for old programs is kept
1515 only for architectures and ABIs that have been added in or before
1516 glibc 2.31. New programs need to use TI-RPC
1517 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1518 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1520 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1521 as shared library for backward compatibility and the NSS modules "nis"
1522 and "nisplus" are not built at all and libnsl's headers aren't
1523 installed. This compatibility is kept only for architectures and ABIs
1524 that have been added in or before version 2.28. Replacement
1525 implementations based on TI-RPC, which additionally support IPv6, are
1526 available from <https://github.com/thkukuk/>. This change does not
1527 affect the "compat" NSS module, which does not depend on libnsl
1528 since 2.27 and thus can be used without NIS.
1530 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1531 removed. To support old binaries, the sysctl function continues to
1532 exist as a compatibility symbol (on those architectures which had it),
1533 but always fails with ENOSYS. This reflects the removal of the system
1534 call from all architectures, starting with Linux 5.5.
1536 * The sstk function is no longer available to newly linked binaries.
1537 Its implementation always returned with a failure, and the function
1538 was not declared in any header file.
1540 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1541 sigrelse, sigignore and sigset, and the sigmask macro have been
1542 deprecated. Applications should use the sigsuspend, sigprocmask and
1543 sigaction functions instead.
1545 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1546 already supported this format for almost 20 years.
1548 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1549 are no longer available to newly linked binaries, and their declarations
1550 have been removed from <string.h>. They are exported solely as
1551 compatibility symbols to support old binaries. All programs should use
1554 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1555 are no longer available to newly linked binaries, and their declarations
1556 have been removed from <stdio.h>. They are exported solely as
1557 compatibility symbols to support old binaries. All programs should use
1558 strerror or strerror_r instead.
1560 * Both strerror and strerror_l now share the same internal buffer in the
1561 calling thread, meaning that the returned string pointer may be invalided
1562 or contents might be overwritten on subsequent calls in the same thread or
1563 if the thread is terminated. It makes strerror MT-safe.
1565 * Using weak references to libpthread functions such as pthread_create
1566 or pthread_key_create to detect the singled-threaded nature of a
1567 program is an obsolescent feature. Future versions of glibc will
1568 define pthread_create within libc.so.6 itself, so such checks will
1569 always flag the program as multi-threaded. Applications should check
1570 the __libc_single_threaded variable declared in
1571 <sys/single_threaded.h> instead.
1573 * The "files" NSS module no longer supports the "key" database (used for
1574 secure RPC). The contents of the /etc/publickey file will be ignored,
1575 regardless of the settings in /etc/nsswitch.conf. (This method of
1576 storing RPC keys only supported the obsolete and insecure AUTH_DES
1577 flavor of secure RPC.)
1579 * The __morecore and __after_morecore_hook malloc hooks and the default
1580 implementation __default_morecore have been deprecated. Applications
1581 should use malloc interposition to change malloc behavior, and mmap to
1582 allocate anonymous memory. A future version of glibc may require that
1583 applications which use the malloc hooks must preload a special shared
1584 object, to enable the hooks.
1586 * The hesiod NSS module has been deprecated and will be removed in a
1587 future version of glibc. System administrators are encouraged to
1588 switch to other approaches for networked account databases, such as
1591 Changes to build and runtime requirements:
1593 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1594 long double redirects.
1596 Security related changes:
1598 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1599 invoked with the -c option and when processing invalid multi-byte input
1600 sequences. Reported by Jan Engelhardt.
1602 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1603 corruption when they were passed a pseudo-zero argument. Reported by Guido
1604 Vranken / ForAllSecure Mayhem.
1606 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1607 expanding ~user has been fixed.
1609 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1610 memmove functions has been fixed. Discovered by Jason Royes and Samual
1611 Dytrych of the Cisco Security Assessment and Penetration Team (See
1614 The following bugs are resolved with this release:
1616 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1617 [10441] manual: Backtraces code example lacks error checking
1618 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1619 timer_sigev_thread dangerous
1620 [14231] stdio: stdio-common tests memory requirements
1621 [14578] libc: /proc-based emulation for lchmod, fchmodat
1622 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1623 filtee has constructor
1624 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1625 sequences (CVE-2016-10228)
1626 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1627 character entities for infinity & pi
1628 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1629 segfaults in applications
1630 [20543] libc: Please move from .gnu.linkonce to comdat
1631 [22489] network: gcc warns about implicit conversion in
1632 ICMP6_FILTER_SETPASS with -Wsign-conversion
1633 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1634 [23294] math: Complex _FloatN functions are redirected to the wrong
1635 function with -mlong-double-64
1636 [23296] libc: Data race in setting function descriptor during lazy
1638 [23668] dynamic-link: ldconfig: Default to the new format for
1640 [23819] hurd: hurd: Add C11 thread support
1641 [23990] build: test-container error out on failure to exec child.
1642 [23991] build: shell-container typo in run_command_array
1643 [24638] manual: Error in example of parsing a template string
1644 [24654] manual: Wrong declaration of wcschr in libc manual
1645 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1647 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1648 dynamically loaded dsos
1649 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1650 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1652 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1653 restore EAX, ECX and EDX
1654 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1655 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1656 [25420] network: Race condition in resolv_conf.c can result in caching
1657 stale configuration forever
1658 [25487] math: sinl() stack corruption from crafted input
1660 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1662 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1663 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1665 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1666 on 32 bit and old kernel
1667 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1668 [25639] localedata: Some names of days and months wrongly spelt in
1670 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1671 amount of sigset_t bytes
1672 [25691] stdio: printf: memory leak when printing long multibyte
1674 [25715] libc: system() returns wrong errors when posix_spawn fails
1675 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1676 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1677 state for conversions that produce two Unicode code points
1678 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1679 for linux x86_64 leads to livelock
1680 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1681 test failures, invalid instruction in ld.so
1682 [25790] glob: Typo in tst-fnmatch.input
1683 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1685 [25819] localedata: Update locale data to Unicode 13.0.0
1686 [25824] libc: Abnormal function of strnlen in aarch64
1687 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1688 [25896] libc: Incorrect prctl
1689 [25902] libc: Bad LOADARGS_N
1690 [25905] dynamic-link: VSX registers are corrupted during PLT
1691 resolution when glibc is built with --disable-multi-arch and --with-
1693 [25933] string: Off by one error in __strncmp_avx2 when
1694 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1696 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1697 exiting detached thread
1698 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1700 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1702 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1703 [26073] math: getpayload() has wrong return value
1704 [26076] dynamic-link: dlmopen crashes after failing to load
1705 dependencies in audit mode
1706 [26120] localedata: column width of of some Korean
1707 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1708 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1709 [26133] libc: Incorrect need_arch_feature_F16C
1710 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1712 [26149] libc: PKU is usable only if OSPKE is set
1713 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1715 [26208] libc: Incorrect bit_cpu_CLFSH
1716 [26210] network: Incorrect use of hidden symbols for global sunrpc
1718 [26211] stdio: printf integer overflow calculating allocation size
1719 [26214] stdio: printf_fp double free
1720 [26215] stdio: printf_fp memory leak
1721 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1722 [26258] nss: nss_compat should not read input files with mmap
1723 [26332] string: Incorrect cache line size load causes memory
1724 corruption in memset
1731 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1732 enable features from the draft ISO C2X standard. Only some features from
1733 this draft standard are supported by the GNU C Library, and as the draft
1734 is under active development, the set of features enabled by this macro is
1735 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1736 by compiling with "gcc -std=gnu2x".
1738 * The <math.h> functions that round their results to a narrower type now
1739 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1740 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1741 Clarification Request 13 to TS 18661-3.
1743 * The function pthread_clockjoin_np has been added, enabling join with a
1744 terminated thread with a specific clock. It allows waiting against
1745 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1747 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1749 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1750 in queries if the trust-ad option is set via the options directive in
1751 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1752 mode, the AD bit, as provided by the name server, is available to
1753 applications which call res_search and related functions. In the default
1754 mode, the AD bit is not set in queries, and it is automatically cleared in
1755 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1756 servers and the network path to them are treated as untrusted.)
1758 Deprecated and removed features, and other changes affecting compatibility:
1760 * The totalorder and totalordermag functions, and the corresponding
1761 functions for other floating-point types, now take pointer arguments to
1762 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1763 passing. This is in accordance with the resolution of Clarification
1764 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1765 floating-point arguments directly will continue to work.
1767 * The obsolete function stime is no longer available to newly linked
1768 binaries, and its declaration has been removed from <time.h>.
1769 Programs that set the system time should use clock_settime instead.
1771 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1772 in a future version of glibc. In this release, the header still exists
1773 but calling ftime will cause a compiler warning. All programs should use
1774 gettimeofday or clock_gettime instead.
1776 * The gettimeofday function no longer reports information about a
1777 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1778 many years, as it cannot handle the full complexity of the world's
1779 timezones, but hitherto we have supported it on a best-effort basis.
1780 Changes required to support 64-bit time_t on 32-bit architectures have
1781 made this no longer practical.
1783 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1784 should expect to receive a 'struct timezone' whose tz_minuteswest and
1785 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1786 happen on a few Linux-based ports. This will be corrected in a future
1789 All callers should supply a null pointer for the 'tzp' argument to
1790 gettimeofday. For accurate information about the time zone associated
1791 with the current time, use the localtime function.
1793 gettimeofday itself is obsolescent according to POSIX. We have no plans
1794 to remove access to this function, but portable programs should consider
1795 using clock_gettime instead.
1797 * The settimeofday function can still be used to set a system-wide time
1798 zone when the operating system supports it. This is because the Linux
1799 kernel reused the API, on some architectures, to describe a system-wide
1800 time-zone-like offset between the software clock maintained by the kernel,
1801 and the "RTC" clock that keeps time when the system is shut down.
1803 However, to reduce the odds of this offset being set by accident,
1804 settimeofday can no longer be used to set the time and the offset
1805 simultaneously. If both of its two arguments are non-null, the call
1806 will fail (setting errno to EINVAL).
1808 Callers attempting to set this offset should also be prepared for the call
1809 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1810 some Linux architectures. The Linux kernel maintainers are discussing a
1811 more principled replacement for the reused API. After a replacement
1812 becomes available, we will change settimeofday to fail with ENOSYS on all
1813 platforms when its 'tzp' argument is not a null pointer.
1815 settimeofday itself is obsolescent according to POSIX. Programs that set
1816 the system time should use clock_settime and/or the adjtime family of
1817 functions instead. We may cease to make settimeofday available to newly
1818 linked binaries after there is a replacement for Linux's time-zone-like
1821 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1822 the optional CAS instruction is implemented (for instance, LEON processors
1823 are still supported, but SuperSPARC processors are not).
1825 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1828 * If a lazy binding failure happens during dlopen, during the execution of
1829 an ELF constructor, the process is now terminated. Previously, the
1830 dynamic loader would return NULL from dlopen, with the lazy binding error
1831 captured in a dlerror message. In general, this is unsafe because
1832 resetting the stack in an arbitrary function call is not possible.
1834 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1835 executable stack unless explicitly configured at build time to require
1836 minimum kernel version 4.8 or newer. This is because executing
1837 floating-point branches on a non-executable stack on Linux kernels prior to
1838 4.8 can lead to application crashes for some MIPS configurations. While
1839 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1840 expected to enable non-executable stack by default with PT_GNU_STACK by
1841 default and is thus likely to trigger a crash on older kernels.
1843 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1844 non-executable stack while dropping support for older kernels.
1846 * System call wrappers for time system calls now use the new time64 system
1847 calls when available. On 32-bit targets, these wrappers attempt to call
1848 the new system calls first and fall back to the older 32-bit time system
1849 calls if they are not present. This may cause issues in environments
1850 that cannot handle unsupported system calls gracefully by returning
1851 -ENOSYS. Seccomp sandboxes are affected by this issue.
1853 Changes to build and runtime requirements:
1855 * It is no longer necessary to have recent Linux kernel headers to build
1856 working (non-stub) system call wrappers on all architectures except 64-bit
1857 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1859 * The ChangeLog file is no longer present in the toplevel directory of the
1860 source tree. ChangeLog files are located in the ChangeLog.old directory as
1861 ChangeLog.N where the highest N has the latest entries.
1863 Security related changes:
1865 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1866 out-of-bounds write when executed in a signal frame context.
1868 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1869 environment variable during program execution after a security
1870 transition, allowing local attackers to restrict the possible mapping
1871 addresses for loaded libraries and thus bypass ASLR for a setuid
1872 program. Reported by Marcin Kościelnicki.
1874 The following bugs are resolved with this release:
1876 [12031] localedata: iconv -t ascii//translit with Greek characters
1877 [15813] libc: Multiple issues in __gen_tempname
1878 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1879 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1880 [19767] libc: vdso is not used with static linking
1881 [19903] hurd: Shared mappings not being inherited by children processes
1882 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1883 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1885 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1886 Symbols-A/B Unicode blocks
1887 [23518] libc: Eliminate __libc_utmp_jump_table
1888 [24026] malloc: malloc_info() returns wrong numbers
1889 [24054] localedata: Many locales are missing date_fmt
1890 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1891 [24304] dynamic-link: Lazy binding failure during ELF
1892 constructors/destructors is not fatal
1893 [24376] libc: RISC-V symbol size confusion with _start
1894 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1896 [24824] libc: test-in-container does not install charmap files compatible
1898 [24844] regex: regex bad pointer / leakage if malloc fails
1899 [24867] malloc: Unintended malloc_info formatting changes
1900 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1901 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1902 [24882] libc: login: pututline uses potentially outdated cache
1903 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1904 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1906 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1908 [24930] dynamic-link: dlopen of PIE executable can result in
1909 _dl_allocate_tls_init assertion failure
1910 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1911 (stringop-overflow error)
1912 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1913 functions other can lead to crashes
1914 [24967] libc: jemalloc static linking causes runtime failure
1915 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1917 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1918 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1919 [25097] libc: new -Warray-bounds with GCC 10
1920 [25112] dynamic-link: dlopen must not make new objects accessible when it
1921 still can fail with an error
1922 [25139] localedata: Please add the new mnw_MM locale
1923 [25149] regex: Array bounds violation in proceed_next_node
1924 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1925 initialized correctly
1926 [25189] libc: glibc's __glibc_has_include causes issues with clang
1928 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1929 value to an unsigned
1930 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1931 binaries (CVE-2019-19126)
1932 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1934 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1936 [25232] string: <string.h> does not enable const correctness for strchr et
1938 [25233] localedata: Consider "." as the thousands separator for sl_SI
1940 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1941 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1942 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1944 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1945 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1947 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1948 (dl_initfirst) link map pointer
1949 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1950 [25423] libc: Array overflow in backtrace on powerpc
1951 [25425] network: Missing call to __resolv_context_put in
1952 getaddrinfo.c:gethosts
1959 * Unicode 12.1.0 Support: Character encoding, character type info, and
1960 transliteration tables are all updated to Unicode 12.1.0, using
1961 generator scripts contributed by Mike FABIAN (Red Hat).
1963 * The dynamic linker accepts the --preload argument to preload shared
1964 objects, in addition to the LD_PRELOAD environment variable.
1966 * The twalk_r function has been added. It is similar to the existing
1967 twalk function, but it passes an additional caller-supplied argument
1968 to the callback function.
1970 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1972 * Minguo (Republic of China) calendar support has been added as an
1973 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1976 * The entry for the new Japanese era has been added for ja_JP locale.
1978 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1979 pvalloc, memalign, and posix_memalign fail now with total object size
1980 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1981 pointer subtraction within the allocated object, where results might
1982 overflow the ptrdiff_t type.
1984 * The dynamic linker no longer refuses to load objects which reference
1985 versioned symbols whose implementation has moved to a different soname
1986 since the object has been linked. The old error message, symbol
1987 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1988 link time reference, is gone.
1990 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1991 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1992 functions. These behave similarly to their "timed" equivalents, but also
1993 accept a clockid_t parameter to determine which clock their timeout should
1994 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1995 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1996 time of the wait (unlike with pthread_condattr_setclock, which requires
1997 the clock choice at initialization time).
1999 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
2000 work, new resolvers can use a second argument which can be extended in
2001 the future, currently it contains the AT_HWCAP2 value.
2003 Deprecated and removed features, and other changes affecting compatibility:
2005 * The copy_file_range function fails with ENOSYS if the kernel does not
2006 support the system call of the same name. Previously, user space
2007 emulation was performed, but its behavior did not match the kernel
2008 behavior, which was deemed too confusing. Applications which use the
2009 copy_file_range function can no longer rely on glibc to provide a fallback
2010 on kernels that do not support the copy_file_range system call, and if
2011 this function returns ENOSYS, they will need to use their own fallback.
2012 Support for copy_file_range for most architectures was added in version
2013 4.5 of the mainline Linux kernel.
2015 * The functions clock_gettime, clock_getres, clock_settime,
2016 clock_getcpuclockid, clock_nanosleep were removed from the librt library
2017 for new applications (on architectures which had them). Instead, the
2018 definitions in libc will be used automatically, which have been available
2021 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
2022 and <sys/stropts.h> have been removed.
2024 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
2025 resolver flag (deprecated in glibc 2.25) have been removed.
2027 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
2028 resolver have been removed from <resolv.h>.
2030 * With --enable-bind-now, installed programs are now linked with the
2033 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
2034 configurations) has been removed, following the deprecation of this
2035 subarchitecture in version 8 of GCC, and its removal in version 9.
2037 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2038 header have been removed.
2040 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2041 deprecated and will be removed from a future version of glibc.
2042 Application should directly access /proc instead. For obtaining random
2043 bits, the getentropy function can be used.
2045 Changes to build and runtime requirements:
2047 * GCC 6.2 or later is required to build the GNU C Library.
2049 Older GCC versions and non-GNU compilers are still supported when
2050 compiling programs that use the GNU C Library.
2052 Security related changes:
2054 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2055 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2056 has undefined behavior. On x32, the size_t argument may be passed
2057 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2058 32 bits. When it happened with the sign bit of RDX register set,
2059 memcmp gave the wrong result since it treated the size argument as
2060 zero. Reported by H.J. Lu.
2062 CVE-2019-9169: Attempted case-insensitive regular-expression match
2063 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2064 over-read. Reported by Hongxu Chen.
2066 The following bugs are resolved with this release:
2068 [2872] locale: Transliteration Cyrillic -> ASCII fails
2069 [6399] libc: gettid() should have a wrapper
2070 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2071 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2072 [17396] localedata: globbing for locale by [[.collating-element.]]
2073 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2074 [18465] malloc: memusagestat is built using system C library
2075 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2076 invalid input drops valid char
2077 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2078 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2079 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2080 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2081 [23352] malloc: __malloc_check_init still defined in public header
2083 [23403] nptl: Wrong alignment of TLS variables
2084 [23501] libc: nftw() doesn't return dangling symlink's inode
2085 [23733] malloc: Check the count before calling tcache_get()
2086 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2088 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2089 [23844] nptl: pthread_rwlock_trywrlock results in hang
2090 [23983] argparse: Missing compat versions of argp_failure and argp_error
2091 for long double = double
2092 [23984] libc: Missing compat versions of err.h and error.h functions for
2093 long double = double
2094 [23996] localedata: Dutch salutations
2095 [24040] libc: riscv64: unterminated call chain in __thread_start
2096 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2098 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2099 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2101 [24114] regex: regexec buffer read overrun in "grep -i
2102 '\(\(\)*.\)*\(\)\(\)\1'"
2103 [24122] libc: Segfaults if 0 returned from la_version
2104 [24153] stdio: Some input functions do not react to stdin assignment
2105 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2106 RDX is set) (CVE-2019-7309)
2107 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2108 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2109 not the default "nor"
2110 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2111 false positives, change to modern flexible array
2112 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2113 instructions while maintaining the robust mutex list due to missing
2115 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2116 unnecessary librt dependencies
2117 [24200] localedata: Revert first_weekday removal in en_IE locale
2118 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2119 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2120 [24216] malloc: Check for large bin list corruption when inserting
2122 [24228] stdio: old x86 applications that use legacy libio crash on exit
2123 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2125 [24293] localedata: Missing Minguo calendar support for TW locales
2126 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2127 tt_RU (Tatar) locale
2128 [24307] localedata: Update locale data to Unicode 12.0.0
2129 [24323] dynamic-link: dlopen should not be able open PIE objects
2130 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2131 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2132 tt_RU (Tatar) locale
2133 [24370] localedata: Add lang_name for tt_RU locale
2134 [24372] locale: Binary locale files are not architecture independent
2135 [24394] time: strptime %Ey mis-parses final year of era
2136 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2138 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2140 [24531] malloc: Malloc tunables give tcache assertion failures
2141 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2143 [24535] localedata: Update locale data to Unicode 12.1.0
2144 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2145 kernels and break testing
2146 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2147 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2148 [-Werror=format-overflow=]
2149 [24570] libc: alpha: compat msgctl uses __IPC_64
2150 [24584] locale: Data race in __wcsmbs_clone_conv
2151 [24588] stdio: Remove codecvt vtables from libio
2152 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2154 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2155 [24632] stdio: Old binaries which use freopen with default stdio handles
2157 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2159 [24652] localedata: szl_PL spelling correction
2160 [24695] nss: nss_db: calling getpwent after endpwent crashes
2161 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2162 in /etc/nsswitch.conf
2163 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2164 [24740] libc: getdents64 type confusion
2165 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2166 always implemented in the same library
2167 [24744] libc: Remove copy_file_range emulation
2168 [24757] malloc: memusagestat is linked against system libpthread
2169 [24794] libc: Partial test suite run builds corrupt test-in-container
2177 * The getcpu wrapper function has been added, which returns the currently
2178 used CPU and NUMA node. This function is Linux-specific.
2180 * A new convenience target has been added for distribution maintainers
2181 to build and install all locales as directories with files. The new
2182 target is run by issuing the following command in your build tree:
2183 'make localedata/install-locale-files', with an optional DESTDIR
2184 to set the install root if you wish to install into a non-default
2185 configured location.
2187 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2189 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2190 for _GNU_SOURCE, to match BSD environments.
2192 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2193 indicates that it will abort the transaction prior to entering the kernel
2194 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2195 suspended, and this caused some undefined side-effects issues by aborting
2196 transactions manually. Glibc avoided it by abort transactions manually on
2197 each syscall, but it lead to performance issues on newer kernels where the
2198 HTM state is saved and restore lazily (the state being saved even when the
2199 process actually does not use HTM).
2201 * The functions posix_spawn_file_actions_addchdir_np and
2202 posix_spawn_file_actions_addfchdir_np have been added, enabling
2203 posix_spawn and posix_spawnp to run the new process in a different
2204 directory. These functions are GNU extensions. The function
2205 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2208 * The popen and system do not run atfork handlers anymore (BZ#17490).
2209 Although it is a possible POSIX violation, the POSIX rationale in
2210 pthread_atfork documentation regarding atfork handlers is to handle
2211 inconsistent mutex state after a fork call in a multi-threaded process.
2212 In both popen and system there is no direct access to user-defined mutexes.
2214 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2215 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2217 - C-SKY ABIV2 soft-float little-endian
2218 - C-SKY ABIV2 hard-float little-endian
2220 * strftime's default formatting of a locale's alternative year (%Ey)
2221 has been changed to zero-pad the year to a minimum of two digits,
2222 like "%y". This improves the display of Japanese era years during
2223 the first nine years of a new era, and is expected to be harmless
2224 for all other locales (only Japanese locales regularly have
2225 alternative year numbers less than 10). Zero-padding can be
2226 overridden with the '_' or '-' flags (which are GNU extensions).
2228 * As a GNU extension, the '_' and '-' flags can now be applied to
2229 "%EY" to control how the year number is formatted; they have the
2230 same effect that they would on "%Ey".
2232 Deprecated and removed features, and other changes affecting compatibility:
2234 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2235 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2237 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2238 in <sys/procfs.h>, has been corrected to match the type actually used by
2239 the Linux kernel. This affects the size and layout of that structure on
2240 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2242 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2243 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2244 defined in <sys/procfs.h>, has been corrected to match the type actually
2245 used by the Linux kernel. This affects the size and layout of those
2248 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2249 meant to scan a string and allocate space for it with malloc, is now
2250 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2251 defined. This extension conflicts with C99's use of '%a' to scan a
2252 hexadecimal floating-point number, which is now available to programs
2253 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2255 POSIX.1-2008 includes the feature of allocating a buffer for string input
2256 with malloc, using the modifier letter 'm' instead. Programs using
2257 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2258 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2259 C99 '%a' no longer need to avoid _GNU_SOURCE.
2261 GCC's -Wformat warnings can detect most uses of this extension, as long
2262 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2263 __attribute__ ((format (scanf, ...))).
2265 Changes to build and runtime requirements:
2267 * Python 3.4 or later is required to build the GNU C Library.
2269 * On most architectures, GCC 5 or later is required to build the GNU C
2270 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2272 Older GCC versions and non-GNU compilers are still supported when
2273 compiling programs that use the GNU C Library.
2275 Security related changes:
2277 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2278 denial of service due to resource exhaustion when processing getaddrinfo
2279 calls with crafted host names. Reported by Guido Vranken.
2281 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2282 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2283 happened, accessing the 32-bit size_t value as the full 64-bit register
2284 in the assembly string/memory functions would cause a buffer overflow.
2285 Reported by H.J. Lu.
2287 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2288 addresses with arbitrary trailing characters, potentially leading to data
2289 or command injection issues in applications.
2291 The following bugs are resolved with this release:
2293 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2294 [10496] localedata: 12h time representation in multiple locales faulty
2295 [10797] localedata: it_IT locale numeric does not have a separator for
2297 [11319] libc: dprintf doesn't handle errors properly
2298 [16346] time: mktime: potentially unsafe use of localtime_offset
2299 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2301 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2302 posix_spawn_file_actions_addfchdir_np
2303 [17426] localedata: Indian locales: set the correct date format
2304 [17490] stdio: popen should not invoke atfork handlers
2305 [17783] libc: TIOCSER_TEMT conditions inconsistent
2306 [18040] regex: use-after-free in regexec/get_subexp
2307 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2308 [20018] network: getaddrinfo should reject IP addresses with trailing
2309 characters (CVE-2016-10739)
2310 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2311 [20271] libc: Missing "\n" in __libc_fatal calls
2312 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2313 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2314 pointer argument is non-NULL
2315 [21037] stdio: open_memstream and freopen
2316 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2317 [21716] time: Crash in glibc's mktime in low-memory situations
2318 [22834] stdio: Subprocess forked by popen may crash in Linux when
2319 multithreads call popen
2320 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2321 and pthread_create fails.
2322 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2323 [23125] libc: riscv64: endless loop when throwing an exception from a
2325 [23275] nptl: Race in pthread_mutex_lock while promoting to
2326 PTHREAD_MUTEX_ELISION_NP.
2327 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2329 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2331 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2333 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2334 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2336 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2337 [23521] nss: get_next_alias nss_files file stream leak
2338 [23538] nptl: Hang in pthread_cond_broadcast
2339 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2340 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2341 [23579] libc: Errors misreported in preadv2
2342 [23597] build: support/test-container.c doesn't work with different
2344 [23603] time: mktime signed integer overflow on large timestamps
2345 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2346 [23614] libc: powerpc: missing CFI register information in __mpn_*
2348 [23637] string: Generic strstr/strcasestr fails with huge needles
2349 [23640] libc: no way to easily clear FD_CLOEXEC in
2350 posix_spawn_file_actions_adddup2()
2351 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2353 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2355 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2356 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2357 bits/types/struct_rusage.h
2358 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2360 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2362 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2363 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2364 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2366 [23724] localedata: Albanian date formats are incorrect
2367 [23735] math: libnldbl_nonshared.a references internal libm symbols
2368 [23740] localedata: kl_GL: Month names and date formats need update
2369 [23744] regex: regex refactorings to remove BE, avoid duplication
2370 [23745] time: mktime fix for Gnulib + coreutils
2371 [23758] time: Improve the width of alternate representation for year in
2373 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2374 [23789] time: mktime does not set errno on failure
2375 [23791] localedata: Wrong monetary format for ca_ES locale
2376 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2377 [23794] locale: c16rtomb does not handle surrogate pairs
2378 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2379 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2380 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2381 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2382 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2383 [23862] libc: [sh] missing kernel-features.h undefines
2384 [23864] libc: [riscv] missing kernel-features.h undefines
2385 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2386 [23907] malloc: Incorrect double-free malloc tcache check disregards
2388 [23913] libc: off-by-one in function maybe_script_execute in
2389 sysdeps/posix/spawni.c
2390 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2391 [23923] locale: Add --no-hard-links option to localedef
2392 [23927] network: Linux if_nametoindex() does not close descriptor
2394 [23961] math: powf can overflow to inf without setting errno in non-
2395 nearest rounding mode
2396 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2397 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2398 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2399 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2400 [24011] localedata: Fixed small type in comment for locale bs_BA
2401 [24018] libc: gettext() may return NULL
2402 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2403 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2404 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2406 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2407 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2409 [24046] localedata: en_US locale doesn't define date_fmt
2410 [24063] manual: @var{errno} should be @code{errno}
2411 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2412 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2414 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2416 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2418 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2420 [24112] network: Do not send DNS queries for non-host names (where all
2421 answers will be rejected)
2422 [24130] libc: alpha __remqu corrupts $f3 register
2429 * The localization data for ISO 14651 is updated to match the 2016
2430 Edition 4 release of the standard, this matches data provided by
2431 Unicode 9.0.0. This update introduces significant improvements to the
2432 collation of Unicode characters. This release deviates slightly from
2433 the standard in that the collation element ordering for lowercase and
2434 uppercase LATIN script characters is adjusted to ensure that regular
2435 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2436 is not matched by [a-z]. With the update many locales have been
2437 updated to take advantage of the new collation information. The new
2438 collation information has increased the size of the compiled locale
2439 archive or binary locales.
2441 * The GNU C Library can now be compiled with support for Intel CET, AKA
2442 Intel Control-flow Enforcement Technology. When the library is built
2443 with --enable-cet, the resulting glibc is protected with indirect
2444 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2445 compatible with all existing executables and shared libraries. This
2446 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2447 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2448 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2449 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2450 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2451 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2454 * The GNU C Library now has correct support for ABSOLUTE symbols
2455 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2456 relocated incorrectly or in some cases discarded. The GNU linker can
2457 make use of the newer semantics, but it must communicate it to the
2458 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2459 field) to indicate such support is required.
2461 * Unicode 11.0.0 Support: Character encoding, character type info, and
2462 transliteration tables are all updated to Unicode 11.0.0, using
2463 generator scripts contributed by Mike FABIAN (Red Hat).
2465 * <math.h> functions that round their results to a narrower type are added
2466 from TS 18661-1:2014 and TS 18661-3:2015:
2468 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2469 fMxaddfNx functions.
2471 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2472 fMxsubfNx functions.
2474 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2475 fMxmulfNx functions.
2477 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2478 fMxdivfNx functions.
2480 * Two grammatical forms of month names are now supported for the following
2481 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2482 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2483 support two grammatical forms in abbreviated month names: Catalan, Greek,
2486 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2487 include the support for two grammatical forms of month names.
2489 * Building and running on GNU/Hurd systems now works without out-of-tree
2492 * The renameat2 function has been added, a variant of the renameat function
2493 which has a flags argument. If the flags are zero, the renameat2 function
2494 acts like renameat. If the flag is not zero and there is no kernel
2495 support for renameat2, the function will fail with an errno value of
2496 EINVAL. This is different from the existing gnulib function renameatu,
2497 which performs a plain rename operation in case of a RENAME_NOREPLACE
2498 flags and a non-existing destination (and therefore has a race condition
2499 that can clobber the destination inadvertently).
2501 * The statx function has been added, a variant of the fstatat64
2502 function with an additional flags argument. If there is no direct
2503 kernel support for statx, glibc provides basic stat support based on
2504 the fstatat64 function.
2506 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2507 library if installed. libidn2 version 2.0.5 or later is recommended. If
2508 libidn2 is not available, internationalized domain names are not encoded
2509 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2510 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2511 with an encoding error.) Flags which used to change the IDN encoding and
2512 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2513 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2514 deprecated. They no longer have any effect.
2516 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2517 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2518 range of ELF gABI expressions including such constructs as
2519 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2520 have been further restricted, and where in the past a dynamic string
2521 token sequence may have been interpreted as a literal string it will
2522 now cause a load failure. These load failures were always considered
2523 unspecified behaviour from the perspective of the dynamic loader, and
2524 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2525 results in a load failure now.
2527 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2528 implementation includes all the standard functions provided by
2531 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2532 thrd_detach, thrd_exit, and thrd_join for thread management.
2534 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2535 mtx_destroy for mutual exclusion.
2537 - call_once for function call synchronization.
2539 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2540 cnd_wait for conditional variables.
2542 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2544 Application developers must link against libpthread to use ISO C threads.
2546 Deprecated and removed features, and other changes affecting compatibility:
2548 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2549 installed. Software that was using either header should be updated to
2550 use standard <stdio.h> interfaces instead.
2552 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2553 This was never required by the C standard, and the macros just expanded
2554 to call alternative names for the same functions. If you hoped getc and
2555 putc would provide performance improvements over fgetc and fputc, instead
2556 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2557 necessary, flockfile and funlockfile.
2559 * All stdio functions now treat end-of-file as a sticky condition. If you
2560 read from a file until EOF, and then the file is enlarged by another
2561 process, you must call clearerr or another function with the same effect
2562 (e.g. fseek, rewind) before you can read the additional data. This
2563 corrects a longstanding C99 conformance bug. It is most likely to affect
2564 programs that use stdio to read interactive input from a terminal.
2567 * The macros 'major', 'minor', and 'makedev' are now only available from
2568 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2569 headers that happen to include <sys/types.h>. These macros are rarely
2570 used, not part of POSIX nor XSI, and their names frequently collide with
2571 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2572 further explanation.
2574 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2575 these macros should first include <sys/types.h>, and then include
2576 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2578 * The tilegx*-*-linux-gnu configurations are no longer supported.
2580 * The obsolete function ustat is no longer available to newly linked
2581 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2582 function has been deprecated in favor of fstatfs and statfs.
2584 * The obsolete function nfsservctl is no longer available to newly linked
2585 binaries. This function was specific to systems using the Linux kernel
2586 and could not usefully be used with the GNU C Library on systems with
2587 version 3.1 or later of the Linux kernel.
2589 * The obsolete function name llseek is no longer available to newly linked
2590 binaries. This function was specific to systems using the Linux kernel
2591 and was not declared in a header. Programs should use the lseek64 name
2592 for this function instead.
2594 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2595 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2596 previously selected by them is now always enabled.
2598 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2599 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2600 restriction (rejecting '_' in host names, among other things) has been
2601 removed, for increased compatibility with non-IDN name resolution.
2603 * The fcntl function now have a Long File Support variant named fcntl64. It
2604 is added to fix some Linux Open File Description (OFD) locks usage on non
2605 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2606 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2607 locks act as a cancellation entrypoint.
2609 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2610 ecb_crypt, and des_setparity are no longer available to newly linked
2611 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2612 longer installed. These functions encrypted and decrypted data with the
2613 DES block cipher, which is no longer considered secure. Software that
2614 still uses these functions should switch to a modern cryptography library,
2617 * Reflecting the removal of the encrypt and setkey functions above, the
2618 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2619 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2622 * The obsolete function fcrypt is no longer available to newly linked
2623 binaries. It was just another name for the standard function crypt,
2624 and it has not appeared in any header file in many years.
2626 * We have tentative plans to hand off maintenance of the passphrase-hashing
2627 library, libcrypt, to a separate development project that will, we hope,
2628 keep up better with new passphrase-hashing algorithms. We will continue
2629 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2630 'crypt_r' should not need to change at all; however, distributions will
2631 need to install <crypt.h> and libcrypt from a separate project.
2633 In this release, if the configure option --disable-crypt is used, glibc
2634 will not install <crypt.h> or libcrypt, making room for the separate
2635 project's versions of these files. The plan is to make this the default
2636 behavior in a future release.
2638 Changes to build and runtime requirements:
2640 GNU make 4.0 or later is now required to build glibc.
2642 Security related changes:
2644 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2645 been fixed by removing the glibc-internal IDNA implementation and using
2646 the system-provided libidn2 library instead. Originally reported by Hanno
2647 Böck and Christian Weisgerber.
2649 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2650 architecture could corrupt memory. Reported by Max Horn.
2652 CVE-2018-11236: Very long pathname arguments to realpath function could
2653 result in an integer overflow and buffer overflow. Reported by Alexey
2656 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2657 architecture could write beyond the target buffer, resulting in a buffer
2658 overflow. Reported by Andreas Schwab.
2660 The following bugs are resolved with this release:
2662 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2663 [6889] manual: 'PWD' mentioned but not specified
2664 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2665 when __WORDSIZE != 64
2666 [13762] regex: re_search etc. should return -2 on memory exhaustion
2667 [13888] build: /tmp usage during testing
2668 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2669 [14092] nptl: Support C11 threads
2670 [14095] localedata: Review / update collation data from Unicode / ISO
2672 [14508] libc: -Wformat warnings
2673 [14553] libc: Namespace pollution loff_t in sys/types.h
2674 [14890] libc: Make NT_PRFPREG canonical.
2675 [15105] libc: Extra PLT references with -Os
2676 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2678 [16335] manual: Feature test macro documentation incomplete and out of
2680 [16552] libc: Unify umount implementations in terms of umount2
2681 [17082] libc: htons et al.: statement-expressions prevent use on global
2682 scope with -O1 and higher
2683 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2684 [17438] localedata: pt_BR: wrong d_fmt delimiter
2685 [17662] libc: please implement binding for the new renameat2 syscall
2686 [17721] libc: __restrict defined as /* Ignore */ even in c11
2687 [17979] libc: inconsistency between uchar.h and stdint.h
2688 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2689 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2690 horrible machine code)
2691 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2693 [18471] libc: llseek should be a compat symbol
2694 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2696 [18991] nss: nss_files skips large entry in database
2697 [19239] libc: Including stdlib.h ends up with macros major and minor being
2699 [19463] libc: linknamespace failures when compiled with -Os
2700 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2701 [19527] locale: Normalized charset name not recognized by setlocale
2702 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2703 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2705 [19728] network: out of bounds stack read in libidn function
2706 idna_to_ascii_4i (CVE-2016-6261)
2707 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2708 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2709 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2711 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2712 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2713 [20419] dynamic-link: files with large allocated notes crash in
2715 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2716 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2717 [20980] manual: CFLAGS environment variable replaces vital options
2718 [21163] regex: Assertion failure in pop_fail_stack when executing a
2719 malformed regexp (CVE-2015-8985)
2720 [21234] manual: use of CFLAGS makes glibc detect no optimization
2721 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2722 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2723 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2724 [21508] locale: intl/tst-gettext failure with latest msgfmt
2725 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2726 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2727 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2729 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2731 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2732 [22247] network: Integer overflow in the decode_digit function in
2733 puny_decode.c in libidn (CVE-2017-14062)
2734 [22342] nscd: NSCD not properly caching netgroup
2735 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2736 [22550] localedata: es_ES locale (and other es_* locales): collation
2737 should treat ñ as a primary different character, sync the collation
2738 for Spanish with CLDR
2739 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2740 by gcc configured with --enable-default-pie
2741 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2742 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2743 crossing 2GB threshold (CVE-2017-18269)
2744 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2746 [22735] time: Misleading typo in time.h source comment regarding
2748 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2749 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2750 `__assert_perror_fail ()' to `__assert_fail_base ()'
2751 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2753 [22786] libc: Stack buffer overflow in realpath() if input size is close
2754 to SSIZE_MAX (CVE-2018-11236)
2755 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2756 through an absolute DT_NEEDED path
2757 [22792] build: tcb-offsets.h dependency dropped
2758 [22797] libc: pkey_get() uses non-reserved name of argument
2759 [22807] libc: PTRACE_* constants missing for powerpc
2760 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2761 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2762 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2763 [22848] localedata: ca_ES: update date definitions from CLDR
2764 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2765 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2766 [22896] localedata: Update locale data for an_ES
2767 [22902] math: float128 test failures with GCC 8
2768 [22918] libc: multiple common of `__nss_shadow_database'
2769 [22919] libc: sparc32: backtrace yields infinite backtrace with
2771 [22926] libc: FTBFS on powerpcspe
2772 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2774 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2775 [22947] libc: FAIL: misc/tst-preadvwritev2
2776 [22963] localedata: cs_CZ: Add alternative month names
2777 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2778 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2779 [22998] dynamic-link: execstack tests are disabled when SELinux is
2781 [23005] network: Crash in __res_context_send after memory allocation
2783 [23007] math: strtod cannot handle -nan
2784 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2785 [23036] regex: regex equivalence class regression
2786 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2787 [23069] libc: sigaction broken on riscv64-linux-gnu
2788 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2789 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2790 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2791 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2792 and libc build with -Os)
2793 [23140] localedata: More languages need two forms of month names
2794 [23145] libc: _init/_fini aren't marked as hidden
2795 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2796 [23171] math: C++ iseqsig for long double converts arguments to double
2797 [23178] nscd: sudo will fail when it is run in concurrent with commands
2798 that changes /etc/passwd
2799 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2801 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2802 [23208] localedata: New locale - Lower Sorbian (dsb)
2803 [23233] regex: Memory leak in build_charclass_op function in file
2805 [23236] stdio: Harden function pointers in _IO_str_fields
2806 [23250] nptl: Offset of __private_ss differs from GCC
2807 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2808 -mtune=generic -mfpmath=sse
2809 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2811 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2812 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2814 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2815 [23277] math: nan function should not have const attribute
2816 [23279] math: scanf and strtod wrong for some hex floating-point
2817 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2819 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2820 [23303] build: undefined reference to symbol
2821 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2822 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2824 [23313] stdio: libio vtables validation and standard file object
2826 [23329] libc: The __libc_freeres infrastructure is not properly run across
2828 [23349] libc: Various glibc headers no longer compatible with
2830 [23351] malloc: Remove unused code related to heap dumps and malloc
2832 [23363] stdio: stdio-common/tst-printf.c has non-free license
2833 [23396] regex: Regex equivalence regression in single-byte locales
2834 [23422] localedata: oc_FR: More updates of locale data
2835 [23442] build: New warning with GCC 8
2836 [23448] libc: Out of bounds access in IBM-1390 converter
2837 [23456] libc: Wrong index_cpu_LZCNT
2838 [23458] build: tst-get-cpu-features-static isn't added to tests
2839 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2841 [23467] dynamic-link: x86/CET: A property note parser bug
2848 * The GNU C Library can now be compiled with support for building static
2849 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2850 executables are like static executables but can be loaded at any address
2851 and provide additional security hardening benefits at the cost of some
2852 memory and performance. When the library is built with --enable-static-pie
2853 the resulting libc.a is usable with GCC 8 and above to create static PIE
2854 executables using the GCC option '-static-pie'. This feature is currently
2855 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2856 aarch64 with binutils 2.30 or later.
2858 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2859 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2862 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2864 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2866 * In order to support faster and safer process termination the malloc API
2867 family of functions will no longer print a failure address and stack
2868 backtrace after detecting heap corruption. The goal is to minimize the
2869 amount of work done after corruption is detected and to avoid potential
2870 security issues in continued process execution. Reducing shutdown time
2871 leads to lower overall process restart latency, so there is benefit both
2872 from a security and performance perspective.
2874 * The abort function terminates the process immediately, without flushing
2875 stdio streams. Previous glibc versions used to flush streams, resulting
2876 in deadlocks and further data corruption. This change also affects
2877 process aborts as the result of assertion failures.
2879 * On platforms where long double has the IEEE binary128 format (aarch64,
2880 alpha, mips64, riscv, s390 and sparc), the math library now implements
2881 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2882 These are the same interfaces added in version 2.26 for some platforms where
2883 this format is supported but is not the format of long double.
2885 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2886 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2887 implements interfaces for that type, as defined by ISO/IEC TS
2888 18661-3:2015. These are corresponding interfaces to those supported for
2891 * The math library now implements interfaces for the _Float32, _Float64 and
2892 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2893 corresponding interfaces to those supported for _Float128.
2895 * glibc now implements the memfd_create and mlock2 functions on Linux.
2897 * Support for memory protection keys was added. The <sys/mman.h> header now
2898 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2901 * The copy_file_range function was added.
2903 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2905 * The ldconfig utility now processes `include' directives using the C/POSIX
2906 collation ordering. Previous glibc versions used locale-specific
2907 ordering, the change might break systems that relied on that.
2909 * Support for two grammatical forms of month names has been added.
2910 In a call to strftime, the "%B" and "%b" format specifiers will now
2911 produce the grammatical form required when the month is used as part
2912 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2913 required when the month is named by itself. For instance, in Greek
2914 and in many Slavic and Baltic languages, "%B" will produce the month
2915 in genitive case, and "%OB" will produce the month in nominative case.
2917 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2918 are all valid and will all accept any known form of month
2919 name---standalone or complete, abbreviated or full. In a call to
2920 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2921 the strings used by "%B" and "%b", respectively. New query
2922 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2923 used by "%OB" and "%Ob", respectively.
2925 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2926 define the strings for %OB and %Ob, respectively; these have the
2927 same syntax as "mon" and "abmon". These arrays are optional; if they
2928 are not provided then they have the same content as "mon" and "abmon",
2931 These features are provided for locales which define "alt_mon" and/or
2932 "ab_alt_mon" in their locale source data. This release includes such
2933 alternative month name data for the following languages: Belarusian,
2934 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2936 This feature is currently a GNU extension, but it is expected to
2937 be added to the next revision of POSIX, and it is also already
2938 available on some BSD-derived operating systems.
2940 This feature will cause existing statically compiled applications
2941 to fail to load locales and fall back to the builtin C/POSIX locales.
2942 See notes below for other changes affecting compatibility.
2944 * Support for the RISC-V ISA running on Linux has been added. This port
2945 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2946 for the following ISA and ABI pairs:
2952 Deprecated and removed features, and other changes affecting compatibility:
2954 * Statically compiled applications attempting to load locales compiled for the
2955 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2956 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2957 support for two grammatical forms of the month names, also extends the locale
2958 data binary format. Static applications needing locale support must be
2959 recompiled to match the runtime and data they are deployed with. In some
2960 distributions there is an upgrade window where dynamically linked applications
2961 may use a new library but the old locale data and also fall back to the
2962 builtin C/POSIX locales; restarting the application process is sufficient to
2965 * Support for statically linked applications which call dlopen is deprecated
2966 and will be removed in a future version of glibc. Applications which call
2967 dlopen need to be linked dynamically instead.
2969 * Support for old programs which use internal stdio data structures and
2970 functions is deprecated. This includes programs which use the C++ streams
2971 provided by libstdc++ in GCC 2.95. Programs which use the internal
2972 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2973 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2974 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2975 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2976 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2977 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2978 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2979 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2980 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2981 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2982 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2983 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2984 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2985 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2986 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2987 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2988 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2989 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2990 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2991 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2992 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2993 future version of glibc. Unlike other symbol removals, these old
2994 applications will not be supported using compatibility symbols.
2996 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2997 defined by <sys/ptrace.h>.
2999 * libm no longer supports SVID error handling (calling a user-provided
3000 matherr function on error) or the _LIB_VERSION variable to control error
3001 handling. (SVID error handling and the _LIB_VERSION variable still work
3002 for binaries linked against older versions of the GNU C Library.) The
3003 libieee.a library is no longer provided. math.h no longer defines struct
3004 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
3005 TLOSS, PLOSS and HUGE.
3007 * The libm functions pow10, pow10f and pow10l are no longer supported for
3008 new programs. Programs should use the standard names exp10, exp10f and
3009 exp10l for these functions instead.
3011 * The mcontext_t type is no longer the same as struct sigcontext. On
3012 platforms where it was previously the same, this changes the C++ name
3013 mangling for interfaces involving this type.
3015 * The add-ons mechanism for building additional packages at the same time as
3016 glibc has been removed. The --enable-add-ons configure option is now
3019 * The --without-fp configure option is now ignored. Whether hardware
3020 floating-point instructions are used is now configured based on whether
3021 the compiler used at configure time (without any options implied by a
3022 --with-cpu= configure option) uses such instructions.
3024 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
3025 the specified string can be parsed as a domain name.
3027 * In the malloc_info output, the <heap> element may contain another <aspace>
3028 element, "subheaps", which contains the number of sub-heaps.
3030 * The libresolv function p_secstodate is no longer supported for new
3033 * The tilepro-*-linux-gnu configuration is no longer supported.
3035 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3036 and will be removed in a future release. Software that is still using
3037 either header should be updated to use standard <stdio.h> interfaces
3040 libio.h was originally the header for a set of supported GNU extensions,
3041 but they have not been maintained as such in many years, they are now
3042 standing in the way of improvements to stdio, and we don't think there are
3043 any remaining external users. _G_config.h was never intended for public
3044 use, but predates the bits convention.
3046 Changes to build and runtime requirements:
3048 * bison version 2.7 or later is required to generate code in the 'intl'
3051 Security related changes:
3053 CVE-2009-5064: The ldd script would sometimes run the program under
3054 examination directly, without preventing code execution through the
3055 dynamic linker. (The glibc project disputes that this is a security
3056 vulnerability; only trusted binaries must be examined using the ldd
3059 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3060 suffered from a one-byte overflow during ~ operator processing (either
3061 on the stack or the heap, depending on the length of the user name).
3062 Reported by Tim Rühsen.
3064 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3065 would sometimes fail to free memory allocated during ~ operator
3066 processing, leading to a memory leak and, potentially, to a denial
3069 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3070 without GLOB_NOESCAPE, could write past the end of a buffer while
3071 unescaping user names. Reported by Tim Rühsen.
3073 CVE-2017-17426: The malloc function, when called with an object size near
3074 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3075 instead of NULL. This was a regression introduced with the new malloc
3076 thread cache in glibc 2.26. Reported by Iain Buclaw.
3078 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3079 to the allocation of too much memory. (This is not a security bug per se,
3080 it is mentioned here only because of the CVE assignment.) Reported by
3083 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3084 of the number of search path components. (This is not a security
3085 vulnerability per se because no trust boundary is crossed if the fix for
3086 CVE-2017-1000366 has been applied, but it is mentioned here only because
3087 of the CVE assignment.) Reported by Qualys.
3089 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3090 for AT_SECURE or SUID binaries could be used to load libraries from the
3093 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3094 succeeds without returning an absolute path due to unexpected behaviour
3095 of the Linux kernel getcwd syscall. Reported by halfdog.
3097 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3098 an object size near the value of SIZE_MAX, would return a pointer to a
3099 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3101 CVE-2018-6551: The malloc function, when called with an object size near
3102 the value of SIZE_MAX, would return a pointer to a buffer which is too
3103 small, instead of NULL.
3105 The following bugs are resolved with this release:
3107 [866] glob: glob should match dangling symlinks
3108 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3109 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3111 [5997] math: Very slow execution of sinf function
3112 [10580] localedata: hr_HR: updated locale
3113 [10871] locale: 'mon' array should contain both nominative and genitive
3115 [12349] localedata: eu_ES: incorrect thousands separator
3116 [13605] localedata: shn_MM: new Shan locale
3117 [13805] localedata: ru_RU: currency should use ',' as radix point
3118 [13953] localedata: km_KH: locale update
3119 [13994] localedata: mjw_IN: new locale
3120 [14121] build: make writes .mo files in po directory
3121 [14333] libc: Fix the race between atexit() and exit()
3122 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3123 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3125 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3126 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3127 width Latin characters
3128 [15332] localedata: es_CU: locale update
3129 [15436] stdio: Don't close or flush stdio streams on abort
3130 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3132 [16148] localedata: ca_ES: incorrect thousands separator
3133 [16750] dynamic-link: ldd should not try to execute the binaries
3135 [16777] localedata: pl_PL: incorrect thousands separator in locale
3136 [16905] localedata: hanzi: new collation
3137 [17563] localedata: cmn_TW: add hanzi collation
3138 [17750] localedata: wrong collation order of diacritics in most locales
3139 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3141 [17956] build: Build fails on missing definitions from header file
3142 nss/nss.h when Mozilla NSS is used for cryptography
3143 [18203] libc: realpath() does not handle unreachable paths correctly
3144 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3145 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3146 [18822] libc: Internal functions are called via PLT
3147 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3148 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3149 [19574] libc: glibc should support building static PIE binaries
3150 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3152 [19971] glob: glob: Do not skip entries with zero d_ino values
3153 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3154 [20008] localedata: km_KH: convert to translit_neutral
3155 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3156 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3157 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3158 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3159 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3161 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3162 they're set, wrong errors returned by gaih_inet when lookup functions
3164 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3165 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3167 [20952] localedata: yuw_PG: new locale
3168 [21084] localedata: charmaps/IBM858: new codepage
3169 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3170 [21242] libc: assert gives pedantic warning in old gcc versions
3171 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3172 __regcall calling convention
3173 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3174 [21326] libc: C99 functions are not declared for C++11 and later if
3175 _GNU_SOURCE is not predefined by g++
3176 [21457] libc: sys/ucontext.h namespace
3177 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3178 [21660] math: GCC fails to compile a formula with tgmath.h
3179 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3180 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3181 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3182 [21684] math: tgmath.h handling of complex integers
3183 [21685] math: tgmath.h handling of bit-fields
3184 [21686] math: tgmath.h handling of __int128
3185 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3187 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3189 [21750] localedata: column width of characters incompatible with classical
3191 [21754] malloc: malloc: Perform as little work as possible after heap
3192 consistency check failures
3193 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3194 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3195 [21791] string: Unused XXX_chk_XXX functions in libc.a
3196 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3198 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3200 [21845] localedata: Added new Locale bho_NP
3201 [21853] localedata: Fix abday Which looks same as day in zh_SG
3202 [21854] localedata: Added New Locale en_SC
3203 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3204 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3205 _dl_runtime_resolve_avx_slow
3206 [21885] network: getaddrinfo: gethosts does not release resolver context
3207 on memory allocation failure
3208 [21899] libc: XPG4.2 sigaction namespace
3209 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3211 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3213 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3214 errno value, causing getaddrinfo to fail
3215 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3216 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3217 instead of EAI_NODATA
3218 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3219 constant PTRACE_SEIZE_DEVEL
3220 [21930] math: C-only gcc builtins used in <math.h> isinf
3221 [21932] network: Unpaired __resolv_context_get in generic get*_r
3223 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3224 [21944] libc: sigval namespace
3225 [21951] localedata: Update hanzi collation by stroke
3226 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3227 sysdeps/x86_64/fpu/e_expf.S
3228 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3229 allocation in syscall loops)
3230 [21959] localedata: Fix Country name for xh_ZA
3231 [21960] localedata: Fix abmon for bem_ZM
3232 [21966] math: AVX2 mathvec functions use FMA without checking
3233 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3234 [21971] localedata: Added New Locale for mfe_MU
3235 [21972] libc: assert macro requires operator== (int) for its argument type
3236 [21973] math: [sparc] libm missing sqrtl compat symbol
3237 [21974] libc: Remove __bb_init_func and __bb_exit_func
3238 [21982] string: stratcliff.c: error: assuming signed overflow does not
3240 [21986] stdio: __guess_grouping is called incorrectly
3241 [21987] math: [sparc32] wrong bits/long-double.h installed
3242 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3244 [22022] localedata: Missing country_name for mni_IN
3245 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3247 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3249 [22026] locale: iconv_open: heap overflow on gconv_init failure
3250 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3251 [22035] math: [m68k] bits/math-inline.h macro namespace
3252 [22038] localedata: Fix abbreviated weeks and months for Somali
3253 [22044] localedata: Remove redundant data for Limburgish Language
3254 [22050] malloc: Linking with -lmcheck does not hook
3255 __malloc_initialize_hook correctly
3256 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3257 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3258 [22070] localedata: charmaps/UTF-8: wcwidth for
3259 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3260 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3261 Jungseong and Jongseong) should be 0
3262 [22078] nss: nss_files performance issue in multi mode
3263 [22082] math: bits/math-finite.h exp10 condition
3264 [22086] libc: pcprofiledump incorrect cross-endian condition
3265 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3266 [22095] network: Name server address allocation memory leak in resolv.conf
3268 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3270 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3271 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3273 [22111] malloc: malloc: per thread cache is not returned when thread exits
3274 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3275 [22134] libc: [linux] implement fexecve with execveat
3276 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3278 [22145] libc: ttyname() gives up too early in the face of namespaces
3279 [22146] math: C++ build issue with float128 on x86_64
3280 [22153] nptl: nptl: save error code before process termination
3281 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3282 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3283 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3284 [22165] libc: [hppa] Text relocations in libc.so
3285 [22180] libc: destructor registered via __cxa_atexit is called twice
3286 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3287 symlinks") cause "make" segfaults
3288 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3290 [22207] libc: FAIL: stdlib/test-atexit-race
3291 [22225] math: nearbyint arithmetic moved before feholdexcept
3292 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3293 [22235] math: iscanonical in C++ and float128
3294 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3295 the svid compat wrapper
3296 [22244] math: ynf and yn are wrong without the svid compat wrapper
3297 [22273] libc: Improper assert in Linux posix_spawn implementation
3298 [22284] libc: -pg -pie doesn't work
3299 [22292] locale: localedef exits with error 4 when it should be error 1
3300 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3301 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3303 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3304 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3306 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3307 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3308 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3309 [22322] libc: [mips64] wrong bits/long-double.h installed
3310 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3311 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3313 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3314 [22343] malloc: Integer overflow in posix_memalign
3315 [22347] libc: getrandom() returns the number of bytes that were copied to
3316 the buffer even though the comments say "Return 0 on success and -1 on
3318 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3319 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3321 [22370] dynamic-link: Incorrect note padding check
3322 [22375] libc: malloc returns pointer from tcache_get when should return
3323 NULL (CVE-2017-17426)
3324 [22377] math: iseqsig, float128 and C++
3325 [22382] localedata: Error in tpi_PG locale
3326 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3327 inside the ASCII printable range
3328 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3330 [22403] localedata: Slash needs escaping in some locales
3331 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3332 [22409] network: res_hnok does not accept some host names used on the
3334 [22412] network: res_dnok, res_hnok should perform syntax checks
3335 [22413] network: ns_name_pton ignores syntactically invalid trailing
3337 [22415] stdio: setvbuf can lead to invalid free/segfault
3338 [22432] build: Non-deterministic build
3339 [22439] malloc: malloc_info should compute summary statistics for all sub-
3341 [22442] network: if_nametoindex could report index for the wrong
3342 networking interface
3343 [22446] build: aliasing violation calling readlink in handle_request
3344 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3345 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3346 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3347 __nscd_hash/__nss_hash
3348 [22463] network: p_secstodate overflow handling
3349 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3350 [22478] libc: sigwait can fail with EINTR
3351 [22505] libc: ldconfig processes include directive in locale-specific
3353 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3354 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3355 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3356 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3357 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3358 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3359 same as for Croatian
3360 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3361 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3362 [22577] libc: missing newline after "cannot allocate TLS data structures
3364 [22588] manual: manual/conf.texi: missing underscore in front of
3366 [22593] math: nextafter and nexttoward are declared with const attribute
3367 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3368 [22603] string: ia64 memchr overflows internal pointer check
3369 [22605] libc: SH clone does not set the exit code correctly
3370 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3372 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3373 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3374 modified in case of success
3375 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3376 [22615] manual: manual: ambiguous wording about errno value in case of
3378 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3380 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3381 binaries or if /proc is not mounted (CVE-2017-16997)
3382 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3383 [22630] build: $(no-pie-ldflag) is no longer effective
3384 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3385 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3386 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3387 [22637] nptl: guard size is subtracted from thread stack size instead of
3389 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3390 [22657] localedata: hu_HU: Avoid double space in date
3391 [22660] math: fmax, fmin sNaN handling on alpha
3392 [22664] libc: New warning of GCC8
3393 [22665] math: alpha: ceil and floor raise inexact exceptions
3394 [22666] math: alpha: trunc raise inexact exceptions
3395 [22667] libc: makecontext lacks stack alignment on i386
3396 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3397 [22679] libc: getcwd(3) can succeed without returning an absolute path
3399 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3400 elision and tunables
3401 [22687] math: [powerpc-nofpu] complex long double functions spurious
3403 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3404 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3405 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3407 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3408 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3410 [22701] nis: Incomplete removal of libnsl
3411 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3412 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3413 [22715] dynamic-link: FAIL: elf/tst-audit10
3414 [22719] libc: Backtrace tests fail on hppa
3415 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3416 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3417 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3418 before the first call to crypt_r () in crypt/badsalttest.c
3425 * A per-thread cache has been added to malloc. Access to the cache requires
3426 no locks and therefore significantly accelerates the fast path to allocate
3427 and free small amounts of memory. Refilling an empty cache requires locking
3428 the underlying arena. Performance measurements show significant gains in a
3429 wide variety of user workloads. Workloads were captured using a special
3430 instrumented malloc and analyzed with a malloc simulator. Contributed by
3431 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3433 * Unicode 10.0.0 Support: Character encoding, character type info, and
3434 transliteration tables are all updated to Unicode 10.0.0, using
3435 generator scripts contributed by Mike FABIAN (Red Hat).
3436 These updates cause user visible changes, especially the changes in
3437 wcwidth for many emoji characters cause problems when emoji sequences
3438 are rendered with pango, see for example:
3439 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3441 * Collation of Hungarian has been overhauled and is now consistent with "The
3442 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3445 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3447 - The GNU C Library will now detect when /etc/resolv.conf has been
3448 modified and reload the changed configuration. The new resolver option
3449 “no-reload” (RES_NORELOAD) disables this behavior.
3451 - The GNU C Library now supports an arbitrary number of search domains
3452 (configured using the “search” directive in /etc/resolv.conf);
3453 previously, there was a hard limit of six domains. For backward
3454 compatibility, applications that directly modify the ‘_res’ global
3455 object are still limited to six search domains.
3457 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3458 Library will now randomly pick a name server from the configuration as a
3459 starting point. (Previously, the second name server was always used.)
3461 * The tunables feature is now enabled by default. This allows users to tweak
3462 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3464 * New function reallocarray, which resizes an allocated block (like realloc)
3465 to the product of two sizes, with a guaranteed clean failure upon integer
3466 overflow in the multiplication. Originally from OpenBSD, contributed by
3467 Dennis Wölfing and Rüdiger Sonderfeld.
3469 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3470 These are extended versions of preadv and pwritev, respectively, taking an
3471 additional flags argument. The set of supported flags depends on the
3472 running kernel; full support currently requires kernel 4.7 or later.
3474 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3475 create a new session ID for the spawned process. This feature is
3476 scheduled to be added to the next major revision of POSIX; for the time
3477 being, it is available under _GNU_SOURCE.
3479 * errno.h is now safe to use from C-preprocessed assembly language on all
3480 supported operating systems. In this context, it will only define the
3481 Exxxx constants, as preprocessor macros expanding to integer literals.
3483 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3484 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3485 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3486 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3488 To compile programs that use this feature, the compiler must support
3489 128-bit floating point with the type name _Float128 (as defined by TS
3490 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3491 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3492 must be defined to make the new interfaces visible.
3494 The new functions and macros correspond to those present for other
3495 floating-point types (except for a few obsolescent interfaces not
3496 supported for the new type), with F128 or f128 suffixes; for example,
3497 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3498 printf or scanf formats for the new type; the strfromf128 and strtof128
3499 interfaces should be used instead.
3501 Deprecated and removed features, and other changes affecting compatibility:
3503 * The synchronization that pthread_spin_unlock performs has been changed to
3504 now be equivalent to a C11 atomic store with release memory order to the
3505 spin lock's memory location. Previously, several (but not all)
3506 architectures used stronger synchronization (e.g., containing what is
3507 often called a full barrier). This change can improve performance, but
3508 may affect odd fringe uses of spin locks that depend on the previous
3509 behavior (e.g., using spin locks as atomic variables to try to implement
3510 Dekker's mutual exclusion algorithm).
3512 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3515 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3516 will only be built and installed when the GNU C Library is configured with
3517 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3518 as TIRPC or rpcsvc-proto, to be used.
3520 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3521 libnss_compat, are deprecated, and will not be built or installed by
3524 The NIS(+) support library, libnsl, is also deprecated. By default, a
3525 compatibility shared library will be built and installed, but not headers
3526 or development libraries. Only a few NIS-related programs require this
3527 library. (In particular, the GNU C Library has never required programs
3528 that use 'gethostbyname' to be linked with libnsl.)
3530 Replacement implementations based on TIRPC, which additionally support
3531 IPv6, are available from <https://github.com/thkukuk/>. The configure
3532 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3533 name service modules, to be built and installed.
3535 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3536 support is enabled, the configured recursive resolver must support EDNS.
3537 (Responding to EDNS-enabled queries with responses which are not
3538 EDNS-enabled is fine, but FORMERR responses are not.)
3540 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3541 servers have not supported this opcode for a long time.
3543 * The _res_opcodes variable has been removed from libresolv. It had been
3544 exported by accident.
3546 * <string.h> no longer includes inline versions of any string functions,
3547 as this kind of optimization is better done by the compiler. The macros
3548 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3550 * The nonstandard header <xlocale.h> has been removed. Most programs should
3551 use <locale.h> instead. If you have a specific need for the definition of
3552 locale_t with no other declarations, please contact
3553 libc-alpha@sourceware.org and explain.
3555 * The obsolete header <sys/ultrasound.h> has been removed.
3557 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3559 * The obsolete function cfree has been removed. Applications should use
3562 * The stack_t type no longer has the name struct sigaltstack. This changes
3563 the C++ name mangling for interfaces involving this type.
3565 * The ucontext_t type no longer has the name struct ucontext. This changes
3566 the C++ name mangling for interfaces involving this type.
3568 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3569 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3570 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3571 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3572 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3573 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3574 fpregset_t type no longer has the name struct fpu. This changes the C++
3575 name mangling for interfaces involving those types.
3577 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3578 synced with the kernel:
3580 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3581 are not supported on this architecture and have been removed.
3583 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3584 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3585 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3587 Programs that assume the GET/SETREGS ptrace requests are universally
3588 available will now fail to build, instead of malfunctioning at runtime.
3590 Changes to build and runtime requirements:
3592 * Linux kernel 3.2 or later is required at runtime, on all architectures
3593 supported by that kernel. (This is a change from version 2.25 only for
3596 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3598 * On most architectures, GCC 4.9 or later is required to build the GNU C
3599 Library. On powerpc64le, GCC 6.2 or later is required.
3601 Older GCC versions and non-GNU compilers are still supported when
3602 compiling programs that use the GNU C Library. (We do not know exactly
3603 how old, and some GNU extensions to C may be _de facto_ required. If you
3604 are interested in helping us make this statement less vague, please
3605 contact libc-alpha@sourceware.org.)
3607 Security related changes:
3609 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3610 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3612 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3613 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3615 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3616 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3619 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3620 fixed (CVE-2017-12133).
3622 The following bugs are resolved with this release:
3624 [984] network: Respond to changed resolv.conf in gethostbyname
3625 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3626 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3628 [12189] libc: __stack_chk_fail should not attempt a backtrace
3630 [14096] time: Race condition on timezone/tst-timezone.out
3631 [14172] localedata: az_IR: new locale
3632 [14995] build: glibc fails to build if gold is the default linker, even if
3634 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3635 [16637] network: inet_pton function is accepting IPv6 with bad format
3636 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3637 x86 and other generic code
3638 [16875] localedata: ko_KR: fix lang_name
3639 [17225] localedata: ar_SY: localized month names for May and June are
3641 [17297] localedata: da_DK: wrong date_fmt string
3642 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3643 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3644 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3645 [19066] localedata: ar_SA abbreviated day and month names are in English
3646 [19569] network: resolv: Support an arbitrary number of search domains
3647 [19570] network: Implement random DNS server selection in the stub
3649 [19838] locale: localedef fails on PA-RISC
3650 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3651 order of 0D36 and 0D37
3652 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3654 [20098] libc: FAIL: debug/backtrace-tst on hppa
3655 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3657 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3659 [20313] localedata: Update locale data to Unicode 9.0
3660 [20424] manual: Document how to provide a malloc replacement
3661 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3663 [20686] locale: Add el_GR@euro to SUPPORTED.
3664 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3665 failures consistently
3666 [21015] dynamic-link: Document and fix --enable-bind-now
3667 [21016] nptl: pthread_cond support is broken on hppa
3668 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3669 frame-pointer on i386
3670 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3672 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3673 [21088] libc: Build fails with --enable-static-nss
3674 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3675 generic c code is used
3676 [21109] libc: Tunables broken on big-endian
3677 [21112] math: powf has large ulp errors with base close to 1 and exponent
3679 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3681 [21120] malloc: glibc malloc is incompatible with GCC 7
3682 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3684 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3685 (-0.0) when linking with -lieee
3686 [21171] math: log10, log2 and lgamma return incorrect results
3687 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3688 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3689 [21207] localedata: ce_RU: update weekdays from CLDR
3690 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3691 [21217] localedata: Update months from CLDR-31
3692 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3693 [21243] libc: support_delete_temp_file should issue warning for failed
3695 [21244] libc: support resolv_test_start() socket fd close should be
3697 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3698 new posix_spawn implementation
3699 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3700 leads to lower CPU frequency
3701 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3702 [21261] libc: [sparc64] bits/setjmp.h namespace
3703 [21267] network: [mips] bits/socket.h IOC* namespace
3704 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3705 [21270] libc: mmap64 silently truncates large offset values
3706 [21275] libc: posix_spawn always crashes on ia64 now
3707 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3708 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3709 [21289] libc: Incorrect declaration for 32-bit platforms with
3710 _FILE_OFFSET_BITS=64 causes build error
3711 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3712 not support gethostbyname4_r
3713 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3715 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3717 [21340] libc: Support POSIX_SPAWN_SETSID
3718 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3719 [21359] network: ns_name_pack needs additional byte in destination buffer
3720 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3721 against fragmentation attacks (CVE-2017-12132)
3722 [21369] network: resolv: Remove EDNS fallback
3723 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3725 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3726 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3727 [21393] stdio: Missing dup3 error check in freopen, freopen64
3728 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3729 [21399] localedata: Bad description for U00EC in
3730 localedata/charmaps/CP1254
3731 [21411] malloc: realloc documentation error
3732 [21426] network: sys/socket.h uio.h namespace
3733 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3734 [21445] libc: signal.h bsd_signal namespace
3735 [21455] network: Network headers stdint.h namespace
3736 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3738 [21475] network: resolv: Overlong search path is truncated mid-label
3739 [21511] libc: sigstack namespace
3740 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3741 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3742 bits/syscall.h: No such file or directory
3743 [21517] libc: struct sigaltstack namespace
3744 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3745 [21533] localedata: Update locale data to Unicode 10.0
3747 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3748 junk at end of line, first unrecognized character is `@'
3749 [21538] libc: SIG_HOLD missing for XPG4
3750 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3751 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3752 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3753 [21543] libc: sigevent namespace
3754 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3755 size for general purpose registers in mcontext_t structure
3756 [21550] libc: sigwait namespace
3757 [21552] libc: XPG4 bsd_signal namespace
3758 [21554] libc: sigpause namespace
3759 [21560] libc: sys/wait.h signal.h namespace
3760 [21561] libc: waitid namespace
3761 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3762 '/usr/include/stdlib.h': Permission denied
3763 [21575] libc: sys/wait.h missing struct rusage definition
3764 [21584] libc: sigaltstack etc namespace
3765 [21597] libc: siginterrupt namespace
3766 [21607] math: hppa: FAIL: math/test-tgmath
3767 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3769 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3770 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3771 stack and heap (CVE-2017-1000366)
3772 [21625] libc: wait3 namespace
3773 [21654] nss: Incorrect pointer alignment in NSS group merge result
3775 [21657] network: Parse interface zone id for node-local multicast
3776 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3778 [21666] libc: .symver is used on common symbol
3779 [21668] network: resolv: res_init cross-thread broadcast introduces race
3781 [21687] math: tgmath.h totalorder, totalordermag return type
3782 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3784 [21696] libc: Incorrect assumption of of __cpu_mask in
3785 posix/sched_cpucount.c
3786 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3787 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3789 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3790 leading to relocation crash
3791 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3792 `resolv_conf_matches (resp, conf)' failed.
3793 [21710] localedata: Added Samoan language locale for Samoa
3794 [21711] localedata: Pashto yesstr/nostr locale are missing
3795 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3796 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3797 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3798 [21723] localedata: yesstr/nostr missing for Chinese language locale
3799 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3801 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3803 [21728] localedata: New Locale for Tongan language
3804 [21729] localedata: incorrect LC_NAME fields for hi_IN
3805 [21733] localedata: yesstr and nostr are missing for zh_HK
3806 [21734] localedata: Missing yesstr and nostr are for kw_GB
3807 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3808 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3809 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3810 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3812 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3814 [21749] localedata: Wrong abbreviated day name (“abday”) for
3816 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3817 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3818 [21759] localedata: missing yesstr and nostr for Tigrinya
3819 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3820 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3821 [21767] localedata: Missing Bislama locales
3822 [21768] localedata: Missing yesstr and nostr for aa_ET
3823 [21770] localedata: Missing Field in li_NL
3824 [21778] nptl: Robust mutex may deadlock
3825 [21779] libc: MicroBlaze segfaults when loading libpthread
3826 [21783] localedata: Fix int_select international_call_prefixes
3827 [21784] localedata: Inconsistency in country_isbn
3828 [21788] localedata: Missing Country Postal Abbreviations
3829 [21794] localedata: Added-country_isbn-for-Italy
3830 [21795] localedata: Add/Fix country_isbn for France
3831 [21796] localedata: Added country_isbn for Republic of Korea
3832 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3833 [21799] localedata: Added int_select international_call_prefixes
3834 [21801] localedata: Added int_select international_call_prefixes
3835 [21804] nptl: Double semicolon in thread-shared-types.h
3836 [21807] localedata: LC_ADDRESS fix for pap_CW
3837 [21808] localedata: Fix LC_ADDRESS for pap_AW
3838 [21821] localedata: Added country_name in mai_IN
3839 [21822] localedata: Fix LC_TIME for mai_IN
3840 [21823] localedata: missing yesstr, nostr for sa_IN
3841 [21825] localedata: Fix name_mrs for mag_IN
3842 [21828] localedata: 2.26 changelog should mention user visible changes
3844 [21835] localedata: Added Maithili language locale for Nepal
3845 [21838] localedata: Removed redundant data for the_NP
3846 [21839] localedata: Fix LC_MONETARY for ta_LK
3847 [21844] localedata: Fix Latin characters and Months Sequence.
3848 [21848] localedata: Fix mai_NP Title Name
3853 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3854 24731-2:2010, is supported to enable declarations of functions from that
3855 TR. Note that not all functions from that TR are supported by the GNU C
3858 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3859 18661-1:2014, is supported to enable declarations of functions and macros
3860 from that TS. Note that not all features from that TS are supported by
3863 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3864 18661-4:2015, is supported to enable declarations of functions and macros
3865 from that TS. Note that most features from that TS are not supported by
3868 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3869 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3870 Since the GNU C Library defaults to a much newer revision of POSIX, this
3871 will only affect programs that specifically request an old conformance
3872 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3873 see a change in the visible declarations, but a program compiled with
3874 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3877 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3878 defined by all multithreaded code, but glibc has not required this for
3881 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3882 means that in a future release, the macros “major”, “minor”, and “makedev”
3883 will only be available from <sys/sysmacros.h>.
3885 These macros are not part of POSIX nor XSI, and their names frequently
3886 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3887 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3888 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3891 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3892 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3893 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3895 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3896 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3897 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3898 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3899 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3900 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3901 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3902 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3903 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3904 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3905 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3908 * New <math.h> features are added from TS 18661-1:2014:
3910 - Signaling NaN macros: SNANF, SNAN, SNANL.
3912 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3913 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3914 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3916 - llogb functions: the llogb, llogbf and llogbl functions, and the
3917 FP_LLOGB0 and FP_LLOGBNAN macros.
3919 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3922 - Comparison macros: iseqsig.
3924 - Classification macros: iscanonical, issubnormal, iszero.
3926 - Total order functions: totalorder, totalorderf, totalorderl,
3927 totalordermag, totalordermagf, totalordermagl.
3929 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3931 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3932 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3934 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3935 are added to libc. They convert a floating-point number into string.
3937 * Most of glibc can now be built with the stack smashing protector enabled.
3938 It is recommended to build glibc with --enable-stack-protector=strong.
3939 Implemented by Nick Alcock (Oracle).
3941 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3942 intended to be used instead of memset() to erase sensitive data after use;
3943 the compiler will not optimize out calls to explicit_bzero even if they
3944 are "unnecessary" (in the sense that no _correct_ program can observe the
3945 effects of the memory clear).
3947 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3948 to float instead of double. This does not affect the ABI of any libraries
3949 that are part of the GNU C Library, but may affect the ABI of other
3950 libraries that use this type in their interfaces.
3952 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3953 float_t and double_t types are now defined to long double instead of float
3954 and double. These options are not the default, and this does not affect
3955 the ABI of any libraries that are part of the GNU C Library, but it may
3956 affect the ABI of other libraries that use this type in their interfaces,
3957 if they are compiled or used with those options.
3959 * The getentropy and getrandom functions, and the <sys/random.h> header file
3962 * The buffer size for byte-oriented stdio streams is now limited to 8192
3963 bytes by default. Previously, on Linux, the default buffer size on most
3964 file systems was 4096 bytes (and thus remains unchanged), except on
3965 network file systems, where the buffer size was unpredictable and could be
3966 as large as several megabytes.
3968 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3969 for the Linux quota interface which predates kernel version 2.4.22 has
3972 * The malloc_get_state and malloc_set_state functions have been removed.
3973 Already-existing binaries that dynamically link to these functions will
3974 get a hidden implementation in which malloc_get_state is a stub. As far
3975 as we know, these functions are used only by GNU Emacs and this change
3976 will not adversely affect already-built Emacs executables. Any undumped
3977 Emacs executables, which normally exist only during an Emacs build, should
3978 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3980 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3981 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3982 “no-ip6-dotint” had already been the default, and support for the
3983 “ip6-dotint” option was removed from the Internet in 2006.
3985 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3986 flag from <resolv.h> have been removed. The option relied on a
3987 backwards-incompatible DNS extension which was never deployed on the
3990 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3991 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3992 They were already unimplemented.
3994 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3995 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3996 removed again from the IETF name lookup interface specification in RFC
3997 2553. Applications should use getaddrinfo instead.
3999 * DNSSEC-related declarations and definitions have been removed from the
4000 <arpa/nameser.h> header file, and libresolv will no longer attempt to
4001 decode the data part of DNSSEC record types. Previous versions of glibc
4002 only implemented minimal support for the previous version of DNSSEC, which
4003 is incompatible with the currently deployed version.
4005 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
4006 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
4007 <arpa/nameser.h> header file because the distinction between RR types and
4008 meta-RR types is not officially standardized, subject to revision, and
4009 thus not suitable for encoding in a macro.
4011 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
4012 and rhook members of the res_state type in <resolv.h> have been removed.
4013 The glibc stub resolver did not support these hooks, but the header file
4014 did not reflect that.
4016 * For multi-arch support it is recommended to use a GCC which has
4017 been built with support for GNU indirect functions. This ensures
4018 that correct debugging information is generated for functions
4019 selected by IFUNC resolvers. This support can either be enabled by
4020 configuring GCC with '--enable-gnu-indirect-function', or by
4021 enabling it by default by setting 'default_gnu_indirect_function'
4022 variable for a particular architecture in the GCC source file
4025 * GDB pretty printers have been added for mutex and condition variable
4026 structures in POSIX Threads. When installed and loaded in gdb these pretty
4027 printers show various pthread variables in human-readable form when read
4028 using the 'print' or 'display' commands in gdb.
4030 * Tunables feature added to allow tweaking of the runtime for an application
4031 program. This feature can be enabled with the '--enable-tunables' configure
4032 flag. The GNU C Library manual has details on usage and README.tunables has
4033 instructions on adding new tunables to the library.
4035 * A new version of condition variables functions have been implemented in
4036 the NPTL implementation of POSIX Threads to provide stronger ordering
4039 * A new version of pthread_rwlock functions have been implemented to use a more
4040 scalable algorithm primarily through not using a critical section anymore to
4043 Security related changes:
4045 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4046 have been created with makecontext could fail to terminate due to a
4047 missing .cantunwind annotation. This has been observed to lead to a hang
4048 (denial of service) in some Go applications compiled with gccgo. Reported
4049 by Andreas Schwab. (CVE-2016-6323)
4051 * The DNS stub resolver functions would crash due to a NULL pointer
4052 dereference when processing a query with a valid DNS question type which
4053 was used internally in the implementation. The stub resolver now uses a
4054 question type which is outside the range of valid question type values.
4057 The following bugs are resolved with this release:
4059 [4099] stdio: Overly aggressive caching by stream i/o functions.
4060 [7065] build: Support building glibc with -fstack-protector or -fstack-
4062 [9842] localedata: en_CA: incorrect date format
4063 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4064 before it started waiting
4065 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4066 [15765] nptl: sem_open is wrongly a cancellation point
4067 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4068 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4070 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4071 library linked with pthread
4072 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4073 "FIXME: Ingo" issue)
4074 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4075 [17252] libc: getrandom and getentropy syscall
4076 [17730] malloc: thread-local storage is sometimes improperly free()'d
4077 after being __libc_memalign()'d
4078 [18241] stdio: failed fseek on memstream does not set errno and can fail
4080 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4082 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4083 PTHREAD_PRIO_INHERIT mutex on ARM
4084 [18784] network: res_query and related function crash for special record
4085 type queries (CVE-2015-5180)
4086 [19380] math: strtod does not raise "inexact"
4087 [19387] string: Integer overflow in memchr
4088 [19390] string: Integer overflow in strncat
4089 [19398] build: linknamespace tests fail with massively parallel build
4090 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4092 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4093 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4094 [19514] libc: [PATCH] Fix spelling errors in spelling
4095 "implement"/"implementation" in several places
4096 [19582] network: Deprecate RES_USE_INET6
4097 [19673] manual: clog10 docs appear to be erroneous
4098 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4099 causes a segmentation fault
4100 [19826] libc: invalid pointer returned from __tls_get_addr with static
4102 [20016] network: resolv: Remove hooks support from the API
4103 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4105 [20033] math: [x86_64] vectorized math function don't call the __finite
4107 [20116] nptl: use after free in pthread_create
4108 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4109 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4111 [20311] nptl: please install proc_service.h
4112 [20366] libc: Compilation errors in installed headers in strict-compliance
4114 [20370] malloc: malloc: Arena free list management is still racy
4115 (incorrect fix in bug 19243)
4116 [20386] libc: assert (X = 0) does not result in GCC warning
4117 [20432] malloc: malloc: Minimize interface required for interposition
4118 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4119 in _Unwind_Backtrace (CVE-2016-6323)
4120 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4121 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4123 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4124 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4125 [20477] network: resolv: incorrect double-checked locking related to
4127 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4129 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4131 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4132 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4133 cause transition penalty
4134 [20517] math: sparcv9 missing fdiml compat symbol
4135 [20524] manual: strverscmp is inconsistent
4136 [20525] libc: <sys/quota.h> should be based on kernel headers
4137 [20539] math: GCC 7 -static -lm fails to link at -O3
4138 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4140 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4142 [20591] network: Remove obsolete DNSSEC support
4143 [20592] network: DNS resource record type classification macros in
4144 <arpa/nameser.h> are incorrect
4145 [20593] network: Update DNS RR type definitions
4146 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4147 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4149 [20629] network: libresolv: Remove support for bitstring labels
4151 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4152 assertion: "maxidx >= 2"
4153 [20660] math: [arm] Use VSQRT
4154 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4155 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4156 [20689] libc: Test for FMA should also check for AVX.
4157 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4158 [20715] math: iszero macro breaks existing code
4159 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4160 [20728] libc: powerpc: Missing TOC stub in clone
4161 [20729] build: glibc-2.24 fails to build for i486 with -Os
4162 [20750] build: Build fails with default PIE enabled gcc-6.x
4163 [20768] math: [alpha] sqrt fegetenv namespace
4164 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4166 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4167 __FLT_EVAL_METHOD__ is 2
4168 [20790] network: rpcgen buffer overrun in get_prog_declaration
4169 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4170 [20829] libc: crypt snprintf namespace
4171 [20847] libc: tst-vfork3 failure
4172 [20855] math: Default bits/mathdef.h has inappropriate float_t
4173 [20859] math: [sh4] FP_ILOGB0 invalid
4174 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4175 U+20AC), not same as GBK
4176 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4177 [20916] math: pow handling of sNaN arguments
4178 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4179 [20919] math: Bad pow (qNaN, 0) result with -lieee
4180 [20940] math: hypot sNaN handling
4181 [20947] math: fmax, fmin sNaN handling
4182 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4183 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4185 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4186 [20973] nptl: robust mutexes: Lost wake-ups
4187 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4188 [20978] nis: strlen on null pointer in nss_nisplus
4189 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4191 [21014] string: i686 memchr overflows internal pointer check
4192 [21019] libc: [mips] n32 lseek incorrect on overflow
4193 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4194 [21026] libc: [MIPS] readahead syscall is broken on n64
4195 [21028] math: Fallback fesetexceptflag should always succeed
4196 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4197 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4199 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4200 [21061] librt: [microblaze] librt lost clock_* exports
4201 [21073] libc: tunables: insecure environment variables passed to
4202 subprocesses with AT_SECURE
4203 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4207 * The minimum Linux kernel version that this version of the GNU C Library
4208 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4209 kernel version 2.6.32 or later suffices (on architectures that already
4210 required kernel versions more recent than 3.2, those requirements remain
4211 unchanged). Linux 3.2 or later kernel headers are required on all
4214 * The pap_AN locale has been deleted. This has been deprecated for a long
4215 time. It has been replaced by pap_AW & pap_CW, both of which have long
4216 been included in previous releases.
4218 * The readdir_r and readdir64_r functions have been deprecated. It is
4219 recommended to use readdir and readdir64 instead.
4221 * The type “union wait” has been removed. It was deprecated in the early
4222 1990s and never part of POSIX. Application code should use the int type
4223 instead of “union wait”.
4225 * A new NSS action is added to facilitate large distributed system
4226 administration. The action, MERGE, allows remote user stores like LDAP
4227 to be merged into local user stores like /etc/groups in order to provide
4228 easy to use, updated, and managed sets of merged credentials. The new
4229 action can be used by configuring it in /etc/nsswitch.conf:
4230 group: files [SUCCESS=merge] nis
4231 Implemented by Stephen Gallagher (Red Hat).
4233 * The deprecated __malloc_initialize_hook variable has been removed from the
4236 * The long unused localedef --old-style option has been removed. It hasn't
4237 done anything in over 16 years. Scripts using this option can safely
4240 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4241 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4242 return the next representable value in the direction of positive infinity
4243 and the nextdown functions return the next representable value in the
4244 direction of negative infinity. These are currently enabled as GNU
4247 Security related changes:
4249 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4250 could result in a stack overflow when getnetbyname was called with an
4251 overly long name. (CVE-2016-3075)
4253 * Previously, getaddrinfo copied large amounts of address data to the stack,
4254 even after the fix for CVE-2013-4458 has been applied, potentially
4255 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4256 instead. Reported by Michael Petlan. (CVE-2016-3706)
4258 * The glob function suffered from a stack-based buffer overflow when it was
4259 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4260 Reported by Alexander Cherepanov. (CVE-2016-1234)
4262 * The Sun RPC UDP client could exhaust all available stack space when
4263 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4264 alloca plugin for GCC. (CVE-2016-4429)
4266 * The IPv6 name server management code in libresolv could result in a memory
4267 leak for each thread which is created, performs a failing naming lookup,
4268 and exits. Over time, this could result in a denial of service due to
4269 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4271 The following bugs are resolved with this release:
4273 [1170] localedata: ne_NP: update Nepali locale definition file
4274 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4276 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4277 [6796] math: fdim() does not set errno on overflow
4278 [10354] libc: posix_spawn should use vfork() in more cases than presently
4279 [11213] localedata: localedata: add copyright disclaimer to locale files
4280 [12143] localedata: chr_US: new Cherokee locale
4281 [12450] localedata: sgs_LT: new locale
4282 [12676] localedata: ln_CD: new locale
4283 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4285 [13304] math: fma, fmaf, fmal produce wrong results
4286 [14259] build: --localedir arg to configure is ignored
4287 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4288 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4289 [14934] localedata: es_CL: wrong first weekday chilean locale
4290 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4292 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4294 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4295 [15368] nptl: raise() is not async-signal-safe
4296 [15479] math: ceil, floor, round and trunc raise inexact exception
4297 [15578] localedata: kk_KZ: various updates
4298 [16003] localedata: pap_AN: punt old locale
4299 [16137] localedata: iw_IL: punt old locale
4300 [16190] localedata: eo: new esperanto locale
4301 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4302 [16742] malloc: race condition: pthread_atfork() called before first
4303 malloc() results in unexpected locking behaviour/deadlocks
4304 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4306 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4307 [17565] localedata: pt_PT: wrong (work-)week start
4308 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4309 [17950] build: Build fails with -msse
4310 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4311 [18433] libc: posix_spawn does not return correctly upon failure to
4313 [18453] localedata: charmaps/IBM875: incorrect codes
4314 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4316 [18896] localedata: he_IL: improvements for currency
4317 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4318 Romanian locale data
4319 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4321 [19056] libc: Deprecate readdir_r
4322 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4324 [19198] localedata: nl_NL: small improvements for Dutch locales
4325 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4326 nameservers (CVE-2016-5417)
4327 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4329 [19400] locale: Language missing in "iso-639.def", trivial fix in
4331 [19431] malloc: Deadlock between fflush, getdelim, and fork
4332 [19505] libc: Incorrect file descriptor validity checks in
4333 posix_spawn_file_actions_add{open,close,dup2}
4334 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4335 when using RTLD_NEXT
4336 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4337 `intl/{gettextP,loadinfo}.h'
4338 [19534] libc: execle, execlp may use malloc
4339 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4340 [19573] network: res_nclose and __res_maybe_init disagree about name
4341 server initialization, breaking Hesiod
4342 [19575] localedata: Status of GB18030 tables
4343 [19581] localedata: sr_* date_fmt string contains additional newline
4344 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4346 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4347 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4348 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4349 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4351 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4353 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4355 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4356 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4357 [19633] locale: strfmon_l applies global locale to number formatting
4358 [19642] network: Memory leak in getnameinfo
4359 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4360 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4362 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4363 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4365 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4366 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4368 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4370 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4372 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4373 pointers and lengths in error-case.
4374 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4375 report errors on UTF-16 surrogates values.
4376 [19755] nscd: nscd assertion failure in gc
4377 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4378 [19759] libc: mempcpy shouldn't be inlined
4379 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4380 [19765] libc: s390 needs an optimized mempcpy
4381 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4382 NAME_MAX limit assumption (CVE-2016-1234)
4383 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4384 [19787] network: Missing and incorrect truncation checks in getnameinfo
4385 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4387 [19791] network: Assertion failure in res_query.c with un-connectable name
4389 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4390 [19822] math: libm.so install clobbers old version
4391 [19825] network: resolv: send_vc can return uninitialized data in second
4392 response to getaddrinfo
4393 [19830] network: nss_dns: should check RDATA length against buffer length
4394 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4395 confronted with A/AAAA records of invalid size
4396 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4397 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4398 [19853] stdio: Printing IBM long double in decimal with high precision is
4400 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4401 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4402 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4404 [19865] network: Assertion failure or memory leak in
4405 _nss_dns_getcanonname_r
4406 [19868] network: nss_dns: netent code does not skip over non-PTR records
4407 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4409 [19881] string: Improve x86-64 memset
4410 [19907] string: Incorrect memcpy tests
4411 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4413 [19925] libc: termios.h XCASE namespace
4414 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4415 [19929] libc: limits.h NL_NMAX namespace
4416 [19931] stdio: Memory leak in vfprintf
4417 [19957] libc: clone(CLONE_VM) access invalid parent memory
4418 [19963] localedata: en_IL: New locale
4419 [19989] stdio: stdio.h cuserid namespace
4420 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4422 [19996] locale: langinfo.h nl_langinfo_l namespace
4423 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4424 [20010] network: getaddrinfo: Stack overflow in hostent translation
4426 [20012] stdio: libio: fmemopen append mode failure
4427 [20014] stdio: stdio.h namespace for pre-threads POSIX
4428 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4429 [20023] libc: fcntl.h timespec namespace
4430 [20024] math: [x86_64] vectorized sincos trashes the stack
4431 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4432 [20041] time: sys/time.h timespec namespace
4433 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4434 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4435 [20051] libc: ttyslot in wrong header under wrong conditions
4436 [20054] libc: gethostname not declared for XPG4
4437 [20055] libc: termios.h missing tcgetsid for XPG4
4438 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4440 [20073] libc: sys/stat.h fchmod namespace
4441 [20074] libc: stdlib.h rand_r namespace
4442 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4443 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4445 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4446 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4448 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4449 [20119] libc: Wrong mask for processors level type from CPUID
4450 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4451 AS not supporting AVX512
4452 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4454 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4455 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4457 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4458 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4459 [20178] libc: posix_spawn{p} should not call exit
4460 [20191] stdio: libio: vtables hardening
4461 [20195] string: FMA4 detection requires CPUID execution with register
4463 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4464 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4466 [20212] math: acos (sNaN) returns sNaN
4467 [20213] math: asin (sNaN) returns sNaN
4468 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4469 [20218] math: [i386] asinhl (sNaN) returns sNaN
4470 [20219] math: [i386] atanhl (sNaN) returns sNaN
4471 [20222] stdio: fopencookie: Mangle function pointers
4472 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4473 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4474 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4476 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4477 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4478 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4479 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4480 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4481 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4482 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4483 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4484 [20240] math: modf (sNaN) returns sNaN
4485 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4486 [20250] math: frexp (sNaN) returns sNaN
4487 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4488 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4490 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4491 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4492 subscript is below array bounds [-Werror=array-bounds]
4493 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4494 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4496 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4497 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4499 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4500 "invalid" exceptions
4501 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4502 [20316] localedata: id_ID: Februari instead of Pebruari
4503 [20327] string: POWER8 strcasecmp returns incorrect result
4504 [20347] math: Failure: Test: j0_downward (0xap+0)
4505 [20348] libc: FAIL: misc/tst-preadvwritev64
4506 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4507 [20350] libc: There is no test for p{read,write}64
4508 [20357] math: Incorrect cos result for 1.5174239687223976
4509 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4513 * Unicode 8.0.0 Support: Character encoding, character type info, and
4514 transliteration tables are all updated to Unicode 8.0.0, using new
4515 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4516 These updates cause user visible changes, such as the fixes for bugs
4517 89, 16061, and 18568.
4519 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4520 kernel-internal CPU set size. This means that requests that change the
4521 CPU affinity which failed before (for example, an all-ones CPU mask) will
4522 now succeed. Applications that need to determine the effective CPU
4523 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4524 setting it because the kernel can adjust it (and the previous size check
4525 would not detect this in the majority of cases).
4527 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4528 the following new symbols are used: fts64_children, fts64_close,
4529 fts64_open, fts64_read and fts64_set.
4531 * getaddrinfo now detects certain invalid responses on an internal netlink
4532 socket. If such responses are received, an affected process will
4533 terminate with an error message of "Unexpected error <number> on netlink
4534 descriptor <number>" or "Unexpected netlink response of size <number> on
4535 descriptor <number>". The most likely cause for these errors is a
4536 multi-threaded application which erroneously closes and reuses the netlink
4537 file descriptor while it is used by getaddrinfo.
4539 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4540 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4541 unnecessary serialization of memory allocation requests across threads.
4542 The defect is now corrected. Users should see a substantial increase in
4543 the concurrent throughput of allocation requests for applications which
4544 trigger this bug. Affected applications typically create and
4545 destroy threads frequently. (Bug 19048 was reported and analyzed by
4548 * There is now a --disable-timezone-tools configure option for disabling the
4549 building and installing of the timezone related utilities (zic, zdump, and
4550 tzselect). This is useful for people who build the timezone data and code
4551 independent of the GNU C Library.
4553 * The obsolete header <regexp.h> has been removed. Programs that require
4554 this header must be updated to use <regex.h> instead.
4556 * The obsolete functions bdflush, create_module, get_kernel_syms,
4557 query_module and uselib are no longer available to newly linked binaries;
4558 the header <sys/kdaemon.h> has been removed. These functions and header
4559 were specific to systems using the Linux kernel and could not usefully be
4560 used with the GNU C Library on systems with version 2.6 or later of the
4563 * Optimized string, wcsmbs and memory functions for IBM z13.
4564 Implemented by Stefan Liebler.
4566 * Newly linked programs that define a variable called signgam will no longer
4567 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4568 require signgam to be set by those functions must ensure that they use the
4569 variable provided by the GNU C Library and declared in <math.h>, without
4570 defining their own copy.
4572 * The minimum GCC version that can be used to build this version of the GNU
4573 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4574 still be used to compile programs using the GNU C Library.
4576 Security related changes:
4578 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4579 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4581 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4582 the pointer guard feature. It is always enabled. Previously,
4583 LD_POINTER_GUARD could be used to disable security hardening in binaries
4584 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4587 * An integer overflow in hcreate and hcreate_r could lead to an
4588 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4590 * The catopen function no longer has unbounded stack usage. Reported by
4591 Max. (CVE-2015-8779)
4593 * The nan, nanf and nanl functions no longer have unbounded stack usage
4594 depending on the length of the string passed as an argument to the
4595 functions. Reported by Joseph Myers. (CVE-2014-9761)
4597 * A stack-based buffer overflow was found in libresolv when invoked from
4598 libnss_dns, allowing specially crafted DNS responses to seize control
4599 of execution flow in the DNS client. The buffer overflow occurs in
4600 the functions send_dg (send datagram) and send_vc (send TCP) for the
4601 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4602 family. The use of AF_UNSPEC triggers the low-level resolver code to
4603 send out two parallel queries for A and AAAA. A mismanagement of the
4604 buffers used for those queries could result in the response of a query
4605 writing beyond the alloca allocated buffer created by
4606 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4607 the overflow. Thanks to the Google Security Team and Red Hat for
4608 reporting the security impact of this issue, and Robert Holiday of
4609 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4611 The following bugs are resolved with this release:
4613 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4614 [887] math: Math library function "logb" and "nextafter" inconsistent
4615 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4616 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4617 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4618 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4620 [4404] localedata: German translation of "Alarm clock" is misleading
4621 [6799] math: nextafter() and nexttoward() doesn't set errno on
4622 overflow/underflow errors
4623 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4625 [10432] nis: _nss_nis_setnetgrent assertion failure
4626 [11460] libc: fts has no LFS support
4627 [12926] network: getaddrinfo()/make_request() may spin forever
4628 [13065] nptl: Race condition in pthread barriers
4629 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4630 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4632 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4633 [14912] libc: Rename non-installed bits/*.h headers
4634 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4635 [15367] math: Let gcc use __builtin_isinf
4636 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4637 [15421] math: lgamma wrongly sets signgam for ISO C
4638 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4639 FE_INVALID with argument out of range
4640 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4642 [15786] dynamic-link: ifunc resolver functions can smash function
4644 [15918] math: Unnecessary check for equality in hypotf()
4645 [16061] localedata: Review / update transliteration data
4646 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4648 [16141] time: strptime %z offset restriction
4649 [16171] math: drem should be alias of remainder
4650 [16296] math: fegetround is pure?
4651 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4652 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4654 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4655 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4657 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4658 "Exception "Inexact" set" on ppc32
4659 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4660 [16517] math: Missing underflow exception from tanf/tan/tanl
4661 [16519] math: Missing underflow exception from sinhf
4662 [16520] math: Missing underflow exception from tanhf
4663 [16521] math: Missing underflow exception from exp2
4664 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4666 [16734] stdio: fopen calls mmap to allocate its buffer
4667 [16961] math: nan function incorrect handling of bad sequences
4668 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4669 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4670 [16985] locale: localedef: confusing error message when opening output
4672 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4673 [17197] locale: Redundant shift character in iconv conversion output at
4675 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4676 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4677 [17250] dynamic-link: static linking breaks nss loading
4678 (getaddrinfo/getpwnam/etc...)
4679 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4681 [17441] math: isnan() should use __builtin_isnan() in GCC
4682 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4683 (related to lock elision)
4684 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4685 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4686 [17887] time: strptime should be able to parse "+01:00" style timezones
4687 [17905] libc: catopen() Multiple unbounded stack allocations
4689 [18084] libc: backtrace (..., 0) dumps core on x86
4690 [18086] libc: nice() sets errno to 0 on success
4691 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4692 is too large (CVE-2015-8778)
4693 [18251] dynamic-link: SONAME missing when audit modules provides path
4694 [18265] libc: add attributes for wchar string and memory functions
4695 [18370] math: csqrt missing underflows
4696 [18421] libc: [hppa] read-only segment has dynamic relocations
4697 [18472] libc: Obsolete syscall wrappers should be compat symbols
4698 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4699 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4700 [18525] localedata: Remove locale timezone information
4701 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4702 [18568] localedata: Update locale data to Unicode 8.0
4703 [18589] locale: sort-test.sh fails at random
4704 [18595] math: ctan, ctanh missing underflows
4705 [18604] libc: assert macro-expands its argument
4706 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4707 contains a vector instruction exception.
4708 [18611] math: j1, jn missing errno setting on underflow
4709 [18618] localedata: sync Chechen locale definitions with other *_RU
4711 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4712 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4713 [18665] network: In send_dg, the recvfrom function is NOT always using the
4714 buffer size of a newly created buffer (CVE-2015-7547)
4715 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4717 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4719 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4720 [18699] math: tilegx cproj() for various complex infinities does not yield
4722 [18724] libc: Harden put*ent functions against data injection
4723 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4724 [18755] build: build errors with -DNDEBUG
4725 [18757] stdio: fmemopen fails to set errno on failure
4726 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4728 [18781] libc: openat64 lacks O_LARGEFILE
4729 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4730 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4731 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4732 [18790] math: [ldbl-128ibm] tanhl inaccurate
4733 [18795] libc: stpncpy fortification misses buffer lengths that are
4734 statically too large
4735 [18796] build: build fails for --disable-mathvec
4736 [18803] math: hypot missing underflows
4737 [18820] stdio: fmemopen may leak memory on failure
4738 [18823] math: csqrt spurious underflows
4739 [18824] math: fma spurious underflows
4740 [18825] math: pow missing underflows
4741 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4742 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4743 [18870] build: sem_open.c fails to compile with missing symbol
4745 [18872] stdio: Fix memory leak in printf_positional
4746 [18873] libc: posix_fallocate overflow check ineffective
4747 [18875] math: Excess precision leads incorrect libm
4748 [18877] libc: arm: mmap offset regression
4749 [18887] libc: memory corruption when using getmntent on blank lines
4750 [18918] localedata: hu_HU: change time to HH:MM:SS format
4751 [18921] libc: Regression: extraneous stat() and fstat() performed by
4753 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4754 binaries (CVE-2015-8777)
4755 [18951] math: tgamma missing underflows
4756 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4758 [18953] localedata: lt_LT: change currency symbol to the euro
4759 [18956] math: powf inaccuracy
4760 [18961] math: [i386] exp missing underflows
4761 [18966] math: [i386] exp10 missing underflows
4762 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4763 [18969] build: multiple string test failures due to missing locale
4765 [18970] libc: Reference of pthread_setcancelstate in libc.a
4766 [18977] math: float / long double Bessel functions not in XSI POSIX
4767 [18980] math: i386 libm functions return with excess range and precision
4768 [18981] math: i386 scalb*, ldexp return with excess range and precision
4769 [18982] stdio: va_list and vprintf
4770 [18985] time: Passing out of range data to strftime() causes a segfault
4772 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4773 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4774 [19012] locale: iconv_open leaks memory on error path
4775 [19016] math: clog, clog10 inaccuracy
4776 [19018] nptl: Mangle function pointers in tls_dtor_list
4777 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4778 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4779 [19048] malloc: malloc: arena free list can become cyclic, increasing
4781 [19049] math: [powerpc] erfc incorrect zero sign
4782 [19050] math: [powerpc] log* incorrect zero sign
4783 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4784 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4785 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4786 [19074] network: Data race in _res_hconf_reorder_addrs
4787 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4788 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4789 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4791 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4793 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4794 [19086] manual: posix_fallocate64 documented argument order is wrong.
4795 [19088] math: lround, llround missing exceptions close to overflow
4797 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4798 [19095] math: dbl-64 lrint incorrect for 64-bit long
4799 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4800 [19124] dynamic-link: ld.so failed to build with older assembler
4801 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4802 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4803 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4804 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4805 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4806 pthread_setaffinity_np
4807 [19156] math: [ldbl-128] j0l spurious underflows
4808 [19164] nptl: tst-getcpu fails with many possible CPUs
4809 [19168] math: math/test-ildoubl and math/test-ldouble failure
4810 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4811 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4813 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4814 (FE_NOMASK_ENV) do not clear SSE exceptions
4815 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4816 _int_new_arena/reused_arena
4817 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4818 [19201] math: dbl-64 remainder incorrect sign of zero result
4819 [19205] math: bits/math-finite.h conditions do not match math.h and
4821 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4822 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4823 for C99-based standards
4824 [19212] libc: features.h not -Wundef clean
4825 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4827 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4828 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4829 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4831 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4832 "inexact" exceptions
4833 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4835 [19242] libc: strtol incorrect in Turkish locales
4836 [19243] malloc: reused_arena can pick an arena on the free list, leading
4837 to an assertion failure and reference count corruption
4838 [19253] time: tzset() ineffective when temporary TZ did not include DST
4840 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4841 [19270] math: [hppa] Shared libm missing __isnanl
4842 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4843 MAP_HUGETLB and MAP_STACK defines
4844 [19313] nptl: Wrong __cpu_mask for x32
4845 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4846 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4847 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4848 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4849 [19363] time: x32: times() return value wrongly truncates/sign extends
4851 [19367] dynamic-link: Improve branch prediction on Silvermont
4852 [19369] network: Default domain name not reset by res_ninit when "search"
4853 / "domain" entry is removed from resolv.conf
4854 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4856 [19385] localedata: bg_BG: time separator should be colon, not comma
4857 [19408] libc: linux personality syscall wrapper may erroneously return an
4858 error on 32-bit architectures
4859 [19415] libc: dladdr returns wrong names on hppa
4860 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4861 IBM905, IBM907, and IBM909
4862 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4863 [19443] build: build failures with -DDEBUG
4864 [19451] build: Make check fails on test-double-vlen2
4865 [19462] libc: Glibc failed to build with -Os
4866 [19465] math: Wrong code with -Os
4867 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4869 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4871 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4872 [19486] math: S390: Math tests fail with "Exception Inexact set".
4873 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4874 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4876 [19590] math: Fail to build shared objects that use libmvec.so functions.
4880 * The following bugs are resolved with this release:
4882 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4883 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4884 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4885 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4886 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4887 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4888 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4889 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4890 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4891 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4892 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4893 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4894 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4895 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4896 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4897 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4898 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4899 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4900 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4901 18657, 18676, 18694, 18696, 18887.
4903 * Cache information can be queried via sysconf() function on s390 e.g. with
4904 _SC_LEVEL1_ICACHE_SIZE as argument.
4906 * A buffer overflow in gethostbyname_r and related functions performing DNS
4907 requests has been fixed. If the NSS functions were called with a
4908 misaligned buffer, the buffer length change due to pointer alignment was
4909 not taken into account. This could result in application crashes or,
4910 potentially arbitrary code execution, using crafted, but syntactically
4911 valid DNS responses. (CVE-2015-1781)
4913 * The time zone file parser has been made more robust against crafted time
4914 zone files, avoiding heap buffer overflows related to the processing of
4915 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4916 large time zone data files. Overly long time zone specifiers in the TZ
4917 variable no longer result in stack overflows and crashes.
4919 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4920 for LD and GD on x86 and x86-64, has been implemented. You will need
4921 binutils-2.24 or later to enable this optimization.
4923 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4924 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4925 Hat). These updates cause user visible changes, such as the fix for bug
4928 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4929 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4930 condition in some applications.
4932 * Added vector math library named libmvec with the following vectorized x86_64
4933 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4935 The library can be disabled with --disable-mathvec. Use of the functions is
4936 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4937 Shared library libmvec.so is linked in as needed when using -lm (no need to
4938 specify -lmvec explicitly for not static builds).
4939 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4941 * A new fmemopen implementation has been added with the goal of POSIX
4942 compliance. The new implementation fixes the following long-standing
4943 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4944 old implementation is still present for use be by existing binaries.
4946 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4947 releases. It has been fixed to match 2.19 and older, but binaries built
4948 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4950 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4951 Contributed by Roland McGrath (Google).
4953 * The header <regexp.h> is deprecated, and will be removed in a future
4954 release. Use of this header will trigger a deprecation warning.
4955 Application developers should update their code to use <regex.h> instead.
4957 This header was formerly part of SUS, but was deprecated in 1994 and
4958 removed from the standard in 2001. Also, the glibc implementation
4959 leaks memory. See BZ#18681 for more details.
4963 * The following bugs are resolved with this release:
4965 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4966 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4967 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4968 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4969 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4970 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4971 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4972 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4973 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4974 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4977 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4978 too little memory for the to-be-scanned arguments and overflow the
4979 allocated buffer. The implementation now correctly computes the required
4980 buffer size when using malloc, and switches to malloc from alloca as
4983 * A new semaphore algorithm has been implemented in generic C code for all
4984 machines. Previous custom assembly implementations of semaphore were
4985 difficult to reason about or ensure that they were safe. The new version
4986 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4987 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4988 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4990 * Port to Altera Nios II has been contributed by Mentor Graphics.
4992 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4993 implementations for powerpc64/powerpc64le.
4994 Implemented by Adhemerval Zanella (IBM).
4996 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4997 and powerpc64le. This may improve lock scaling of existing programs on
4998 HTM capable systems. The lock elision code is only enabled with
4999 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
5000 powerpc will issue a transaction abort on every syscall to avoid side
5001 effects being visible outside transactions.
5003 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
5004 AArch64. Contributed by ARM Ltd.
5006 * i386 memcpy functions optimized with SSE2 unaligned load/store.
5008 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
5009 under certain input conditions resulting in the execution of a shell for
5010 command substitution when the application did not request it. The
5011 implementation now checks WRDE_NOCMD immediately before executing the
5012 shell and returns the error WRDE_CMDSUB as expected.
5014 * CVE-2012-3406 printf-style functions could run into a stack overflow when
5015 processing format strings with a large number of format specifiers.
5017 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
5018 infinite loop if the DNS response contained a PTR record of an unexpected
5021 * The minimum GCC version that can be used to build this version of the GNU
5022 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
5023 still be used to compile programs using the GNU C Library.
5025 * The GNU C Library is now built with -Werror by default. This can be
5026 disabled by configuring with --disable-werror.
5028 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
5030 * The obsolete sigvec function has been removed. This was the original
5031 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
5032 programs have been using instead for about 25 years. Of course, ABI
5033 compatibility for old binaries using sigvec remains intact.
5035 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5036 with newer versions of bison.
5038 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5039 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5040 registers overlay two consecutive single-precision registers. MIPS32R2
5041 introduced a new FPU mode (FR=1) where double-precision registers extend the
5042 corresponding single-precision registers which is incompatible with the
5043 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5044 require the use of FR=1 making a transition necessary. New o32 ABI
5045 extensions enable users to migrate over time from the original o32 ABI
5046 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5047 tracks the ABI of any loaded object and verifies that new objects are
5048 compatible. Mode transitions will also be requested as required and
5049 unsupportable objects will be rejected. The ABI checks include both soft and
5050 hard float ABIs for o32, n32 and n64.
5052 GCC 5 with GNU binutils 2.25 onwards:
5053 It is strongly recommended that all o32 system libraries are built using the
5054 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5055 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5056 compiler using --with-fp-32=xx to set this by default.
5060 * The following bugs are resolved with this release:
5062 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5063 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5064 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5065 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5066 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5067 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5068 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5069 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5070 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5071 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5072 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5073 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5074 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5075 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5076 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5078 * Reverted change of ABI data structures for s390 and s390x:
5079 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5080 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5081 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5082 are preserved pointing straight to the same implementation as the old ones.
5083 Given that, new callers will simply provide a too-big buffer to these
5084 functions. Any applications/libraries out there that embed jmp_buf or
5085 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5086 against 2.19 headers will have to rebuilt again. This is necessary in any
5087 case to revert the breakage in their ABI caused by the glibc change.
5089 * Support for file description locks is added to systems running the
5090 Linux kernel. The standard file locking interfaces are extended to
5091 operate on file descriptions, not file descriptors, via the use of
5092 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5093 are associated with an open file instead of a process.
5095 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5097 * The minimum Linux kernel version that this version of the GNU C Library
5098 can be used with is 2.6.32.
5100 * Running the testsuite no longer terminates as soon as a test fails.
5101 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5102 with PASS or FAIL lines for individual tests. A summary of the results is
5103 printed, including a list of failing lists, and "make check" exits with
5104 error status if there were any unexpected failures. "make check
5105 stop-on-test-failure=y" may be used to keep the old behavior.
5107 * The am33 port, which had not worked for several years, has been removed
5110 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5111 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5112 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5113 conflicted with POSIX (support for which was removed in 2.19), the
5114 interfaces those macros enabled remain available when compiling with
5115 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5116 test macros defined.
5118 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5120 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5121 This may improve lock scaling of existing programs on TX capable systems.
5122 The lock elision code is only built with --enable-lock-elision=yes and
5123 then requires a GCC version supporting the TX builtins. With lock elision
5124 default mutexes are elided via __builtin_tbegin, if the cpu supports
5125 transactions. By default lock elision is not enabled and the elision code
5128 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5129 copy the path argument. This allowed programs to cause posix_spawn to
5130 deference a dangling pointer, or use an unexpected pathname argument if
5131 the string was modified after the posix_spawn_file_actions_addopen
5134 * All supported architectures now use the main glibc sysdeps directory
5135 instead of some being in a separate "ports" directory (which was
5136 distributed separately before glibc 2.17).
5138 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5139 On configurations that support it (all Linux configurations), it's now
5140 used regardless of the --enable-add-ons switch to configure. It is no
5141 longer possible to build such configurations without pthreads support.
5143 * Locale names, including those obtained from environment variables (LANG
5144 and the LC_* variables), are more tightly checked for proper syntax.
5145 setlocale will now fail (with EINVAL) for locale names that are overly
5146 long, contain slashes without starting with a slash, or contain ".." path
5147 components. (CVE-2014-0475) Previously, some valid locale names were
5148 silently replaced with the "C" locale when running in AT_SECURE mode
5149 (e.g., in a SUID program). This is no longer necessary because of the
5152 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5153 with application code using Intel MPX instructions. (With all previous
5154 versions, the MPX register state could be clobbered when making calls
5155 into or out of a shared library.) Note that while the new dynamic
5156 linker is compatible with all known x86 hardware whether or not it
5157 supports Intel MPX, some x86 instruction-set emulators might fail to
5158 handle the new instruction encodings. This is known to affect Valgrind
5159 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5160 release), and might affect other tools that do instruction emulation.
5162 * Support for loadable gconv transliteration modules has been removed.
5163 The support for transliteration modules has been non-functional for
5164 over a decade, and the removal is prompted by security defects. The
5165 normal gconv conversion modules are still supported. Transliteration
5166 with //TRANSLIT is still possible, and the //IGNORE specifier
5167 continues to be supported. (CVE-2014-5119)
5169 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5170 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5171 resulting a denial-of-service security vulnerability in applications which
5172 use functions related to iconv. (CVE-2014-6040)
5176 * The following bugs are resolved with this release:
5178 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5179 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5180 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5181 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5182 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5183 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5184 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5185 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5186 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5187 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5188 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5189 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5190 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5191 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5192 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5193 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5194 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5195 16431, 16453, 16474, 16506, 16510, 16529
5197 * Slovenian translations for glibc messages have been contributed by the
5198 Translation Project's Slovenian team of translators.
5200 * The public headers no longer use __unused nor __block. This change is to
5201 support compiling programs that are derived from BSD sources and use
5202 __unused internally, and to support compiling with Clang's -fblock
5203 extension which uses __block.
5205 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5206 large collation sequences to optimize multiple passes. This cache
5207 computation may overflow for large collation sequences and may cause a
5208 stack or buffer overflow. This is now fixed to use a slower algorithm
5209 which does not use a cache if there is an integer overflow.
5211 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5212 rules for large collation sequences to optimize multiple passes and falls
5213 back to alloca if malloc fails, resulting in a possible stack overflow.
5214 The implementation now falls back to an uncached collation sequence lookup
5217 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5218 initialized for static applications resulting in the security feature
5219 being disabled. The pointer guard is now correctly initialized to a
5220 random value for static applications. Existing static applications need
5221 to be recompiled to take advantage of the fix (bug 15754).
5223 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5224 to the d_name member of struct dirent, or omit the terminating NUL
5225 character. (Bugzilla #14699).
5227 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5228 aligned_alloc functions could allocate too few bytes or corrupt the
5229 heap when passed very large allocation size values (Bugzilla #15855,
5232 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5233 for AF_INET6 has been fixed (Bugzilla #16072).
5235 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5236 pap_CW, quz_PE, the_NP.
5238 * Substantially revised locales: gd_GB, ht_HT
5240 * The LC_ADDRESS field was updated to support country_car for almost all
5243 * ISO 1427 definitions were updated.
5245 * ISO 3166 definitions were updated.
5247 * The localedef utility now supports --big-endian and --little-endian
5248 command-line options to generate locales for a different system from that
5249 for which the C library was built.
5251 * Binary locale files now only depend on the endianness of the system for
5252 which they are generated and not on other properties of that system. As a
5253 consequence, binary files generated with new localedef may be incompatible
5254 with old versions of the GNU C Library, and binary files generated with
5255 old localedef may be incompatible with this version of the GNU C Library,
5256 in the following circumstances:
5258 + Locale files may be incompatible on m68k systems.
5260 + Locale archive files (but not separate files for individual locales) may
5261 be incompatible on systems where plain "char" is signed.
5263 * The configure option --disable-versioning has been removed. Builds with
5264 --disable-versioning had not worked for several years.
5266 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5267 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5269 * SystemTap probes for malloc have been introduced.
5271 * SystemTap probes for slow multiple precision fallback paths of
5272 transcendental functions have been introduced.
5274 * Support for powerpc64le has been added.
5276 * The soft-float powerpc port now supports e500 processors.
5278 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5280 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5281 set of header declarations that are enabled by default, even when other
5282 feature test macros or compiler options such as -std=c99 would otherwise
5283 disable some of those declarations.
5285 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5286 conflict with POSIX. The libbsd-compat library (which was a dummy library
5287 that did nothing) has also been removed.
5289 * Preliminary documentation about Multi-Thread, Async-Signal and
5290 Async-Cancel Safety has been added.
5292 * Change of ABI data structures for s390 and s390x:
5293 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5294 allow for future hardware extensions. All library functions that accept or
5295 return these structures were versioned in order to provide backwards
5296 compatibility with existing code. However, not all cases can be handled
5297 with interface versioning. If an application embeds either structure into
5298 another structure and that structure is passed to another compilation unit
5299 which expects the newer larger-sized object then any access to the new
5300 fields will result in undefined behaviour. Similarly any access to fields
5301 that were moved by the enlarging of the structures will cause undefined
5302 behaviour. To fix the undefined behaviour all objects that are part of the
5303 final in-memory image must agree on the size of structures, and this may
5304 require recompilation.
5308 * The following bugs are resolved with this release:
5310 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5311 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5312 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5313 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5314 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5315 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5316 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5317 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5318 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5319 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5320 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5321 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5322 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5325 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5326 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5327 Distributions can re-enable building and using pt_chown via the new configure
5328 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5329 considerable security risks and should only be used if the distribution
5330 understands and accepts the risks.
5332 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5335 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5336 fixed (Bugzilla #15330).
5338 * Add support for calling C++11 thread_local object destructors on thread
5339 and program exit. This needs compiler support for offloading C++11
5340 destructor calls to glibc.
5342 * Improved worst case performance of libm functions with double inputs and
5345 * Support for priority inherited mutexes in pthread condition variables on
5346 non-x86 architectures.
5348 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5350 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5352 * Optimized string functions for ARM. Implemented by Will Newton and
5355 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5357 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5360 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5361 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5363 * Added a benchmark framework to track performance of functions in glibc.
5365 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5366 It is based on draft TS 18661 and currently enabled as a GNU extension.
5368 * On Linux, the clock function now uses the clock_gettime system call
5369 for improved precision, rather than old times system call.
5371 * Added support for version-3 tz format files. This is needed when using
5372 the tz database release 2013e or later, and affects a few unusual cases --
5373 currently only TZ='America/Godthab' for time stamps after 2037.
5375 * Added new API functions pthread_getattr_default_np and
5376 pthread_setattr_default_np to get and set the default pthread
5377 attributes of a process.
5379 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5380 This may improve lock scaling of existing programs on TSX capable systems.
5381 When the --enable-lock-elision=yes parameter is specified at configure
5382 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5385 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5386 availability). Implemented by Ryan S. Arnold.
5388 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5392 * The following bugs are resolved with this release:
5394 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5395 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5396 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5397 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5398 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5399 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5400 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5401 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5402 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5403 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5404 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5405 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5406 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5407 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5408 14879, 14889, 14893, 14898, 14914.
5410 * Optimization of memcpy for MIPS.
5412 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5413 EMFILE has been fixed (Bugzilla #14889).
5415 * The add-on ports collection is now distributed in the "ports" subdirectory
5416 of the main GNU C Library distribution, rather than separately.
5418 * Port to ARM AArch64 contributed by Linaro.
5420 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5421 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5423 Implemented by Andreas Krebbel.
5425 * The new function secure_getenv allows secure access to the environment,
5426 returning NULL if running in a SUID/SGID process. This function replaces
5427 the internal function __secure_getenv.
5429 * SystemTap static probes have been added into the dynamic linker.
5430 Implemented by Gary Benson.
5432 * Optimizations of string functions strstr, strcasestr and memmem.
5433 Implemented by Maxim Kuvyrkov.
5435 * The minimum Linux kernel version that this version of the GNU C Library
5436 can be used with is 2.6.16.
5438 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5439 powerpc POWER7. Implemented by Will Schmidt.
5441 * New configure option --disable-nscd builds the C library such that it
5442 never attempts to contact the Name Service Caching Daemon (nscd).
5443 New configure option --disable-build-nscd avoids building nscd itself;
5444 this is the default if --disable-nscd is used.
5446 * Improved support for cross-compilation, including cross-testing and
5447 bootstrap builds without a previously built glibc.
5449 * Several testsuite tests are now able to test multiple IFUNC variants of an
5450 interface, rather than just testing the one that would be chooen by
5453 * New configure options --with-bugurl and --with-pkgversion, for
5454 distributors to use to embed their bug-reporting and package version
5455 information in --help and --version output.
5457 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5458 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5459 allows creation of chroots without the procfs mounted on /proc.
5461 * The `crypt' function now fails if passed salt bytes that violate the
5462 specification for those values. On Linux, the `crypt' function will
5463 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5464 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5465 when the mode is enabled.
5467 * The `clock_*' suite of functions (declared in <time.h>) is now available
5468 directly in the main C library. Previously it was necessary to link with
5469 -lrt to use these functions. This change has the effect that a
5470 single-threaded program that uses a function such as `clock_gettime' (and
5471 is not linked with -lrt) will no longer implicitly load the pthreads
5472 library at runtime and so will not suffer the overheads associated with
5473 multi-thread support in other code such as the C++ runtime library.
5475 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5480 * The following bugs are resolved with this release:
5482 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5483 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5484 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5485 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5486 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5487 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5488 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5489 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5490 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5491 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5492 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5493 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5494 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5495 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5496 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5497 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5498 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5499 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5500 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5501 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5502 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5503 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5506 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5507 configuring glibc with:
5508 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5509 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5510 Implemented by H.J. Lu.
5514 + define static_assert
5516 + do not declare gets
5518 + declare at_quick_exit and quick_exit also for ISO C11
5520 + aligned_alloc. NB: The code is deliberately allows the size parameter
5521 to not be a multiple of the alignment. This is a moronic requirement
5522 in the standard but it is only a requirement on the caller, not the
5525 + timespec_get added
5527 + uchar.h support added
5529 + CMPLX, CMPLXF, CMPLXL added
5531 Implemented by Ulrich Drepper.
5533 * Support for the IA-64 has been moved to ports.
5535 * Remove support for anything but ELF binary format
5537 * Checking versions of poll, ppoll added.
5538 Implemented by Ulrich Drepper.
5540 * More generic and 64-bit performance optimizations to math functions.
5541 Implemented by Ulrich Drepper.
5543 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5544 headers and functions available at compile time as they were before
5545 version 2.14. This option will be removed at some time in the future
5546 after the TI-RPC library becomes fully sufficient for the needs of
5547 existing applications.
5549 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5550 Note that glibc is not expected to work with any Linux kernel version
5553 * New header <sys/auxv.h> and function getauxval allowing easy access to
5554 the AT_* key-value pairs passed from the Linux kernel. The header also
5555 defines the HWCAP_* bits associated with the AT_HWCAP key.
5557 * New locales: mag_IN
5559 * New configure option --enable-systemtap builds SystemTap static probes
5560 into libc for setjmp and longjmp and into libpthread for various operations.
5561 So far the setjmp/longjmp probes and some of the libpthread probes are
5562 provided only for i*86 and x86_64.
5563 Implemented by Roland McGrath and Rayson Ho.
5565 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5567 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5570 * More optimized functions for SPARC. Implemented by David S. Miller.
5572 * Improved support for cross-compilation, especially bootstrap builds
5573 without a previously built glibc.
5575 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5576 Chris Metcalf from Tilera.
5578 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5579 now supported for ARM processors.
5581 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5582 as the name of the dynamic linker, to distinguish it from the
5583 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5585 * Support for CRIS has been removed from ports.
5587 * A new class of installed header has been documented for low-level
5588 platform-specific functionality. PowerPC added the first instance with a
5589 function to provide time base register access. Contributed by Tulio
5590 Magno Quites Machado Filho.
5592 * ix86 configurations now install header files that are consistent with
5593 what x86-64 configurations install. These same header files can be used
5594 for -m32, -m64, or -mx32 builds.
5595 Contributed by H.J. Lu.
5597 * Math library bug fixes. A thorough audit of all open math library bugs was
5598 conducted by Joseph Myers. Significant progress was made on many math
5599 library bugs resulting in more accurate exceptions and function results.
5600 Many thanks to all those that contributed including Andreas Jaeger for his
5601 patch review and work on the x87 trigonometric instruction issues.
5603 * Timezone data is no longer installed. Timezone-related binaries and scripts
5604 will continue to be installed. Users should obtain their timezone data from
5605 their distribution provider or from the tzdata package at
5606 <ftp://munnari.oz.au/pub/>.
5610 * The following bugs are resolved with this release:
5612 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5613 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5614 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5615 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5616 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5617 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5618 13484, 13506, 13515, 13523, 13524, 13538, 13540
5620 * New program pldd to list loaded object of a process
5621 Implemented by Ulrich Drepper.
5623 * Add nss_db support back to glibc. No more dependency on Berkeley db
5624 and support for initgroups lookups.
5625 Implemented by Ulrich Drepper.
5627 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5628 Contributed by HJ Lu.
5630 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5631 Contributed by HJ Lu.
5633 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5634 on x86-32 and x86-64.
5635 Contributed by Liubov Dmitrieva.
5637 * Optimized strchr and strrchr for SSE on x86-32.
5638 Contributed by Liubov Dmitrieva.
5640 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5641 for x86-64 and x86-32.
5642 Contributed by Liubov Dmitrieva.
5644 * New interfaces: scandirat, scandirat64
5645 Implemented by Ulrich Drepper.
5647 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5648 Implemented by Ulrich Drepper.
5650 * nscd now also caches the netgroup database.
5651 Implemented by Ulrich Drepper.
5653 * Integrate libm with gcc's -ffinite-math-only option.
5654 Implemented by Ulrich Drepper.
5656 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5657 to math functions. Implemented by Ulrich Drepper.
5659 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5660 Implemented by Ulrich Drepper.
5662 * New Linux interfaces: process_vm_readv, process_vm_writev
5664 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5665 Implemented by Ulrich Drepper.
5667 * Optimized nearbyint and strcasecmp for PPC.
5668 Implemented by Adhemerval Zanella.
5670 * New locales: bho_IN, unm_US, es_CU, ta_LK
5674 * The following bugs are resolved with this release:
5676 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5677 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5678 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5679 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5680 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5681 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5682 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5683 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5684 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5685 12795, 12811, 12813, 12814, 12841
5687 * The RPC implementation in libc is obsoleted. Old programs keep working
5688 but new programs cannot be linked with the routines in libc anymore.
5689 Programs in need of RPC functionality must be linked against TI-RPC.
5690 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5692 Visible changes of this change include (obviously) the inability to link
5693 programs using RPC functions without referencing the TI-RPC library and the
5694 removal of the RPC headers from the glibc headers.
5695 Implemented by Ulrich Drepper.
5697 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5698 syncfs, setns, sendmmsg
5700 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5701 yue_HK, lij_IT, mhr_RU
5703 * New encodings: CP770, CP771, CP772, CP773, CP774
5705 * New program sotruss to trace calls through PLTs
5706 Implemented by Ulrich Drepper.
5708 * The malloc hook implementation is marked deprecated and will be removed
5709 from the default implementation in the next version. The design never
5710 worked ever since the introduction of threads. Even programs which do
5711 not create threads themselves can use multiple threads created internally.
5715 * The following bugs are resolved with this release:
5717 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5718 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5719 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5720 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5723 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5725 * POWER7 optimizations: memset, memcmp, strncmp
5727 * New optimized string functions for x86-64: strnlen (SSE2),
5728 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5729 Implemented by Ulrich Drepper.
5733 * The following bugs are resolved with this release:
5735 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5736 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5737 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5738 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5739 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5740 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5741 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5742 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5744 * New interfaces: pthread_getname_np, pthread_setname_np
5746 * New Linux interface: recvmmsg
5748 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5750 * The dynamic linker now recognizes supported ABI versions from the
5751 EI_ABIVERSION field in the ELF header.
5752 Implemented by Ulrich Drepper.
5754 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5755 will not be used to fill in password fields in the passwd.byname replies.
5756 Instead it is used to synthesize the shadow.byname table, should it be
5757 missing. This is a useful mode in some installations involving Solaris.
5758 Implemented by Ulrich Drepper.
5760 * New locales: kok_IN, sq_MK, cv_RU
5764 * The following bugs are resolved with this release:
5766 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5767 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5768 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5769 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5770 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5771 10789, 10817, 10823, 10840, 10847
5773 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5775 Implemented by Ulrich Drepper.
5777 * Checking version of longjmp added that fails if an uninitialized stack
5778 frame would be created. Implemented by Ulrich Drepper.
5780 * STT_GNU_IFUNC is now supported in static executables.
5781 Implemented by H.J. Lu.
5783 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5785 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5786 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5787 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5788 Contributed by H.J. Lu.
5790 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5791 Implemented by Ulrich Drepper.
5793 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5795 Contributed by H.J. Lu.
5797 * Support for fma instruction in AVX on x86-64.
5798 Implemented by H.J. Lu and Ulrich Drepper.
5800 * AVX support in x86-64 auditing support in ld.so.
5801 Implemented by H.J. Lu.
5803 * STB_GNU_UNIQUE support added.
5804 Implemented by Ulrich Drepper.
5806 * Implement second fallback mode for optimized DNS lookup for even more
5807 broken environments. If two requests from the same port are not
5808 handled correctly close the socket and open a new one before sending
5809 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5810 can be used to select this mode right away, instead of rediscovering the
5811 necessity is every process again.
5812 Implemented by Ulrich Drepper.
5814 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5815 Implemented by Adam Tkac.
5817 * Optimized iconv conversions for S390x.
5818 Implemented by Andreas Krebbel.
5820 * Using condvars with PI mutexes is now more efficient due to kernel
5821 support for requeueing to PI futexes. NPTL support added for x86-64.
5822 Implemented by Ulrich Drepper.
5824 * New locales: ps_AF, my_MM
5828 * The following bugs are resolved with this release:
5830 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5831 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5832 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5833 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5834 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5836 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5837 Implemented by Ulrich Drepper.
5839 * New Linux interfaces: accept4, fallocate, fallocate64.
5840 Implemented by Ulrich Drepper.
5842 * Correct declarations of string function when used in C++ code. This
5843 could lead to compile errors for invalid C++ code.
5845 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5848 * New POSIX 2008 interface: psiginfo
5849 Implemented by Ulrich Drepper.
5851 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5852 Implemented by Ulrich Drepper.
5854 * Support for selecting between multiple function definitions at runtime
5855 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5857 * The libcrypt library can now use the hash function implementations in
5858 NSS. Implemented by Ulrich Drepper.
5860 * The malloc implementation can be compiled to be less memory efficient
5861 but higher performing in multi-threaded programs.
5862 Implemented by Ulrich Drepper.
5864 * New locales: nan_TW@latin, ks_IN
5866 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5867 Implemented by Ulrich Drepper.
5869 * Extended printf hook support. It is possible to use user-defined types
5870 and extend existing format specifiers.
5871 Implemented by Ulrich Drepper.
5873 * Handling for group shadow files has been added.
5874 Implemented by Ulrich Drepper.
5876 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5877 servers (the case, e.g., for some people using the built-in DNS
5878 server in ADSL modems/routers). There is a once-per-process timeout
5879 in case of a broken server. To avoid it, users can run nscd or put
5880 'options single-request' in /etc/resolv.conf.
5881 Implemented by Ulrich Drepper.
5885 * The following bugs are resolved with this release:
5887 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5888 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5889 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5890 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5891 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5893 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5894 up at the same time. Implemented by Ulrich Drepper.
5896 * TLS descriptors for LD and GD on x86 and x86-64.
5897 Implemented by Alexandre Oliva.
5899 * getaddrinfo now handles DCCP and UDPlite.
5900 Implemented by Ulrich Drepper.
5902 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5903 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5904 Implemented by Ulrich Drepper.
5906 * New implementation of memmem, strstr, and strcasestr which is O(n).
5907 Implemented by Eric Blake.
5909 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5911 * Implement "e" option for popen to open file descriptor with the
5912 close-on-exec flag set. Implemented by Ulrich Drepper.
5914 * Implement "b" mode for fmemopen. In this mode writes writes don't
5915 implicitly add a NUL byte and seeks from the end of the buffer really
5916 use the buffer end, not the string length as the basis.
5917 Implemented by Ulrich Drepper.
5919 * Many functions, exported and internal, now atomically set the close-on-exec
5920 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5922 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5924 Implemented by Pravin Satpute.
5926 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5930 * The following bugs are resolved with this release:
5932 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5933 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5934 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5935 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5936 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5937 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5938 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5940 * New locales: bo_CN, bo_IN, shs_CA.
5942 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5944 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5945 Implemented by Pravin Satpute.
5947 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5949 * nscd caches now all timeouts for DNS entries
5950 Implemented by Ulrich Drepper.
5952 * nscd is more efficient and wakes up less often.
5953 Implemented by Ulrich Drepper.
5955 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5956 vdprintf, and obstack_vprintf.
5957 Implemented by Jakub Jelinek.
5959 * Faster memset for x86-64.
5960 Implemented by Harsha Jagasia and H.J. Lu.
5962 * Faster memcpy on x86.
5963 Implemented by Ulrich Drepper.
5965 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5966 Implemented by Ulrich Drepper.
5968 * Faster sqrt and sqrtf implementation for some PPC variants.
5969 Implemented by Steven Munroe.
5973 * The following bugs are resolved with this release:
5975 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5976 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5977 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5978 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5979 5071, 5103, 5104, 5112, 5113, 5184, 5186
5981 * More checking functions: fread, fread_unlocked, open*, mq_open.
5982 Implemented by Jakub Jelinek and Ulrich Drepper.
5984 * Extend fortification to C++. Implemented by Jakub Jelinek.
5986 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5987 by not recognizing 'a' as a modifier when those specs are requested.
5988 Implemented by Jakub Jelinek.
5990 * PPC optimizations to math and string functions.
5991 Implemented by Steven Munroe.
5993 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5994 options to be passed. Implemented by Ulrich Drepper.
5996 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5998 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5999 Implemented by Ulrich Drepper.
6001 * Handle private futexes in the NPTL implementation.
6002 Implemented by Jakub Jelinek and Ulrich Drepper.
6004 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
6005 Implemented by Roland McGrath and Ulrich Drepper.
6007 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
6009 * SHA-256 and SHA-512 based password encryption.
6010 Implemented by Ulrich Drepper.
6012 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
6013 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
6016 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
6017 Implemented by Ulrich Drepper.
6021 * The following bugs are resolved with this release:
6023 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
6024 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
6025 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
6026 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
6027 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
6028 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
6029 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
6032 * New Linux interfaces: epoll_pwait, sched_getcpu.
6034 * New generic interfaces: strerror_l.
6036 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6040 * The following bugs are resolved with this release:
6042 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6043 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6044 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6045 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6046 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6047 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6048 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6049 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6050 3225, 3251, 3252, 3253, 3273
6052 * For Linux, the sorting of addresses returned by getaddrinfo now also
6053 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6054 Implemented by Ulrich Drepper.
6056 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6057 Implemented by Ulrich Drepper.
6059 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6061 * New iconv module for MIK. Contributed by Alexander Shopov.
6063 * For sites with broken group and/or passwd database, the auto-propagate
6064 option of nscd can prevent creating ID lookup entries from the results
6065 of a name lookup and vice versa. This usually is no problem but some
6066 site might have problems with the default behavior.
6067 Implemented by Ulrich Drepper.
6069 * Iterating over entire database in NIS can be slow. With the
6070 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6071 to trade time for memory. The entire database will be read at once.
6072 Implemented by Ulrich Drepper.
6074 * The interfaces introduced in RFC 3542 have been implemented by
6077 * Support for the new ELF hash table format was added by Ulrich Drepper.
6079 * Support for priority inheritance mutexes added by Jakub Jelinek and
6082 * Support for priority protected mutexes added by Jakub Jelinek.
6084 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6085 or_IN, csb_PL, fy_NL, sr_ME.
6089 * More overflow detection functions.
6091 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6092 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6094 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6095 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6096 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6097 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6098 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6099 by Masahide Washizawa.
6101 * It is now possible to install audit libraries for the dynamic linker using
6102 LD_AUDIT. Implemented by Ulrich Drepper.
6104 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6105 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6106 For a libc and libpthread that works well on Linux 2.4 kernels, we
6107 recommend using the stable 2.3 branch.
6109 * The new function open_wmemstream acts like open_memstream,
6110 but uses a wchar_t wide character buffer.
6112 * The new function ppoll is an improved version of poll, similar to pselect.
6114 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6115 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6116 renameat, unlinkat, linkat, symlinkat, readlinkat.
6118 * New Linux kernel system calls: unshare,
6119 inotify_init, inotify_add_watch, inotify_rm_watch.
6121 * The euidaccess function is now also known by the alias eaccess,
6122 for compatibility with some other systems.
6124 * Timezone data updated to 2006b version.
6128 * The following bugs are resolved with this release:
6130 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6131 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6132 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6133 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6134 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6135 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6137 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6139 * As of this release, GCC 4 can be used to compile the C Library.
6141 * Timezone data updated to 2005m version.
6145 * The following bugs are resolved with this release:
6147 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6148 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6149 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6150 777, 787, 821, 822, 823, 825
6152 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6156 * Support for RFC 3678. Real implementations exist only for Linux so far.
6157 Implemented by Ulrich Drepper.
6159 * nscd can now cache entries persistently. Expiring entries are reloaded.
6160 For speedups the cache can be shared in memory with client processes.
6161 Implemented by Ulrich Drepper.
6163 * nscd can now perform SELinux checks.
6164 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6166 * getaddrinfo queries are now cached. Canonical name lookup is performed
6168 Implemented by Ulrich Drepper.
6170 * The nothrow function attribute is used when headers are used by gcc when
6171 compiling C code. This can avoid significant amounts of exception
6174 * The malloc functions perform more error checking and are stricter when
6175 it comes to reacting on errors. The default action is to terminate
6176 the process after showing an error message. Implemented by Ulrich Drepper.
6178 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6179 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6181 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6182 namespaces using the new function dlmopen(). This feature is of course,
6183 like most other dynamic loading functionality, not available in statically
6184 linked applications. Implemented by Ulrich Drepper.
6186 * Low-overhead boundary checking variants of string and some stdio functions
6187 were added. These are to be used in conjunction with a gcc patch by
6188 Jakub Jelinek which adds calls to these functions if possible.
6189 Implemented by Jakub Jelinek and Ulrich Drepper.
6191 * Old code for several operating systems and machine architectures that
6192 have not been in working condition in a long time have been removed from
6193 the main source tree maintained by the GNU C Library's maintainers.
6194 These files are now reside in the separate `ports' source module
6195 that is usable as an add-on when building the library.
6199 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6200 interrogate the dynamic linker, compatible with the Solaris interface.
6202 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6203 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6205 * getifaddrs now uses the netlink interface on Linux to get its information.
6206 Implemented by Thorsten Kukuk.
6208 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6209 Implemented by Ulrich Drepper.
6211 * support for non-executable stacks on x86 has been added. Changes mostly
6214 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6217 * getaddrinfo now performs destination address selection according to
6222 * Thread-safe interfaces for many functions that access locale data
6223 were added in version 2.3, but these features were omitted from NEWS.
6224 Many functions have variants with an `_l' suffix that take a `locale_t'
6225 object as a parameter rather than consulting the current locale.
6226 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6227 create and maintain `locale_t' objects. Additionally, the new function
6228 `uselocale' sets "the current locale" (as used by functions not so
6229 parameterized) set for an individual thread. These features were added
6230 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6232 * The functions getresuid, getresgid, setresuid, and setresgid, which
6233 have long been available on Linux, are now declared in <unistd.h>
6234 and are now also available on the Hurd.
6236 * ELF thread-local storage support (TLS) now works on x86-64.
6238 * The new dynamic string token $LIB is expanded in shared library names.
6239 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6241 * Aldy Hernandez contributed complete software floating point support for
6242 PowerPC machines with no FPU.
6244 * fexecve is implemented on Linux.
6246 * The `btowc' function should work at least twice as fast due to
6247 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6249 * With appropriate thread add-ons cancelable functions are now implemented
6250 in libc.so as well. No need to call the function in libpthread. This
6251 change allowed to finally disable the incorrect and expensive handling
6252 of weak definition in ld.so.
6254 * Yet more PLT entries in libc.so have been removed. We finally arrived
6255 at the bare minimum. Startup times improved appropriately.
6257 * Support for the new Linux/x86 system call interface was added. The
6258 AT_SYSINFO auxiliary vector entry is recognized and handled.
6262 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6265 * iconv (the program and the interface) now accepts empty names (excluding
6266 options like //TRANSLIT) to mean "use charset of current locale".
6268 * localedef can now transliterate characters in strings which are not in
6269 the provided charmap. The information from the input locale is used.
6271 * Prelinking support was added for ELF targets. This requires additional
6272 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6274 * Read-only stdio streams now use mmap to speed up operation by eliminating
6275 copying and buffer underflows. To use add 'm' to the mode string of
6276 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6278 * The malloc functions were completely rewritten by Wolfram Gloger based
6279 on Doug Lea's malloc-2.7.0.c.
6281 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6282 implementation of regex.
6284 * Bruno Haible upgraded the iconv and locale implementation to support
6287 * Contents of the LC_* and LANG environment variables in the CEN style are
6288 not recognized anymore. It never was used. Change by Ulrich Drepper.
6290 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6291 thread-local storage (TLS) ABI on some platforms.
6292 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6294 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6295 EUC-JISX0213, and TSCII.
6297 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6298 BSD-compatible interface for getting all network interface addresses.
6299 Implementation for IPv4 by Roland McGrath.
6301 * Loading of locale data is faster due to the introduction of a locale
6302 archive. Implemented by Roland McGrath and Ulrich Drepper.
6304 * Startup times are significantly reduced by not using exported functions
6305 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6308 * Steven Munroe contributed a port to PowerPC64/Linux.
6312 * The Hurd now uses the GNU libio implementation of stdio rather than the
6313 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6315 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6316 with the same behavior as the Linux system call of the same name.
6320 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6321 128-bit long double format.
6323 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6324 IBM1161, and IBM1162 charsets.
6326 * Andreas Jaeger contributed a port to x86-64/Linux.
6328 * Peter Bruin contributed a port to PowerPC/Hurd.
6330 * libc functions using I/O streams now can handle wide-oriented streams
6333 * optimizations in the dynamic linker. Binaries created by recent binutils
6334 versions start up quicker due to reduced time spent on relocations.
6336 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6340 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6341 asinh, atanh, j0 for the 128-bit long double format.
6343 * Bruno Haible updated all the code handling Unicode in some form to
6344 support Unicode 3.1.
6346 * Speed of regex for single-byte locales is back to previous levels.
6347 Patch by Isamu Hasegawa.
6349 * Alpha, SPARC, and IA-64 now also using floating stacks.
6351 * Startup time of internationalized applications greatly improved through
6352 iconv cache. Use iconvconfig to generate the cache file.
6353 Contributed by Ulrich Drepper.
6355 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6356 severe performance problems. Patch by David Mosberger.
6358 * The Hurd port got a lot more functionality like AIO, various stdio
6359 extensions, etc. Mainly done by Roland McGrath.
6361 * mtrace can now lookup symbols in shared libraries.
6365 * Intel's IA-64 math library is largely integrated. It provides fast and
6366 accurate implementatations for most basic and standard math functions
6367 in float, double, and long double format.
6369 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6370 and asin for the 96-bit long double format and asin, log, tan for the
6371 128-bit long double format.
6373 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6374 The basic double functions exist today. Contributed by Abraham Ziv
6375 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6376 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6378 * An asynchronous name lookup library was added. The interface is designed
6379 after POSIX AIO. The proposal was circulated beforehand to get comments.
6380 No negative ones came in. Implemented by Ulrich Drepper.
6382 * Port to S390/64bit contributed by Martin Schwidefsky
6383 <schwidefsky@de.ibm.com>.
6385 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6386 of functions for Linux/IA-64.
6388 * The RPC code is now thread safe. Threads can now use the same service
6389 of different services at the same time. Patch by Eric Norum
6390 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6392 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6393 family of functions for Linux/S390.
6395 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6396 of functions for Linux/x86.
6398 * Port to Linux/CRIS contributed by Axis Communications.
6402 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6403 we can now check for namespace violations and missing declarations. The
6404 result is that almost all headers are now Unix-compliant (as defined in
6405 the upcoming XPG6). The negative side is that some programs might need
6406 corrections, too, if they depend on the incorrect form of the headers in
6407 previous versions which defined too many symbols and included too many
6410 * regex now handles multibyte character sets correctly.
6411 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6413 * iconv (the program) does now conform to the upcoming XPG6 and handles
6414 charmaps. Instead of the charset names the path of charmaps can be
6415 provided and the conversion happens based on this data.
6416 Contributed by Ulrich Drepper.
6418 * The locale program now provides detailed information about the installed
6423 only lists the names of the supported locales
6427 provides details such as country, language, and codeset name.
6428 Contributed by Ulrich Drepper.
6432 * The gencat program now parses the input file according to the charset
6433 selected by the LC_CTYPE category. This is important for stateful
6434 character sets. To make generating catalogs easier there is a way
6435 to overwrite the charset selected by the locale: before the first
6436 message or $ quote line the catalog can contain a line like
6438 $ codeset=ISO-8859-2
6440 to select the charset (ISO-8859-2 in this case).
6442 Implemented by Shinya Hanataka and Ulrich Drepper.
6444 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6445 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6446 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6448 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6449 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6451 * The LANGUAGE environment variable is now ignored unless the locale is
6452 changed from the default "C" locale.
6454 * The usual bug fixes.
6458 * Greg McGary added runtime support for bounds checking using gcc's
6459 new -fbounded-pointers option. ix86 target is complete. PowerPC
6462 * Thorsten Kukuk added secure mode support to nscd.
6464 * The Berkeley db libraries have been removed.
6466 Related, the nss_db module is now in a separate package since it
6467 obviously requires a database library being available.
6469 * Wide character I/O streams implemented by Ulrich Drepper.
6471 * Functions from the extended socket API added by Ulrich Drepper.
6473 * Functions feenableexcept and fedisableexcept to control the
6474 behaviour of individual exceptions have been added by Andreas Jaeger.
6476 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6478 * The resolver code has been updated from bind 8.2.3-T5B which supports
6479 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6482 This change could in some situations effect backward compatibility. Since
6483 now `_res' is a thread-local instead of a global variable, modifying it
6484 in one thread does not have any effect in other threads.
6486 The resolver library was also extended to allow IPv6 as the transport
6487 protocol for the requests. This work was done by Stig Venaas.
6489 * Compatibility code for K&R C compilers has been removed from the
6490 header files. A ISO C compiler is needed to use the library
6491 (conforming to either C89 or C99 standard).
6493 * Complete rewrite of the localedef program to support multibyte character
6494 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6495 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6496 Implemented by Ulrich Drepper.
6498 Bruno Haible significantly improved the generation and use of the data
6499 structures for the wide character tables.
6501 * Plural handling in gettext implemented by Ulrich Drepper.
6503 * The utmp daemon has been removed.
6505 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6507 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6510 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6512 * POSIX barriers implemented by Kaz Kylheku.
6514 * POSIX spawn function family implemented by Ulrich Drepper.
6516 * POSIX spinlocks are now available.
6518 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6520 * the configure option --enable-kernel=X.Y.Z allows to strip out
6521 compatibility for kernel versions before X.Y.Z. This is currently only
6522 implemented for Linux.
6524 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6525 field sin6_scope_id. This means that all programs using IPv6 should be
6526 recompiled. Don't expect binary compatibility with previous glibc
6529 * various conversion modules for IBM character sets contributed by
6532 * IA-64 port by Jes Sorensen and HJ Lu.
6546 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6548 * New xdr functions are added; some rpc functions are now 64bit clean.
6550 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6552 * Fixed known incompatibilities with glibc 2.0.
6554 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6556 * Optimized a number of functions (especially the ELF dynamic loader).
6558 * Update timezone data files.
6560 * lots of charmaps corrections
6562 * some new locale definitions and charmaps
6567 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6568 conform to POSIX member type requirements. Symbol versions have been
6569 adjusted as needed within the library, and for direct use by applications,
6570 but there is potential for problems if third-party libraries use
6571 struct timeval as part of their interface. This does not present
6572 a problem for X and other "essential" system libraries.
6574 * An additional locale model to support C++ Standard Library locale
6575 model and probably more was implemented by Ulrich Drepper.
6577 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6580 * Miles Bader provided the `argp' function family to support hierarchical
6581 command line argument parsing, layered on top of getopt.
6583 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6585 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6588 * scanf recognizes the %a and %A format for scanning floating point numbers.
6590 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6591 information and interfaces for the available integer types.
6593 * about 130 new math functions were added to implement the ISO C9x math
6596 * the new header <complex.h> contains definitions of the complex math
6597 functions from ISO C 9X.
6599 * the new header <tgmath.h> defines generic macros to use complex or
6600 real valued functions.
6602 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6604 * Andreas Jaeger provided a test suite for the math library.
6606 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6608 * Ulrich Drepper added character set conversion functions (iconv).
6610 * Optimized string functions have been added.
6612 * The localedata addon is now part of glibc.
6614 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6616 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6617 daemon for NSS (nscd).
6619 Missing a better place here are some numbers on improvements. Under
6620 Linux 2.1.125 un-tar-ing the kernel sources takes
6624 using local files 12.19s 6.88s 22.91s
6626 using NIS 13.92s 8.91s 26.34s
6628 using NIS & nscd 10.37s 7.34s 25.30s
6630 using NIS+ 27.57s 30.37s 640.46s
6632 using NIS+ & nscd 10.25s 7.83s 26.51s
6634 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6636 Keep in mind that non-namelookup related operations dominate above times.
6637 It was just a common complain that using NIS+ unpacking the kernel is
6640 [1] The old nscd implementation is not available anymore since it was
6641 distributed with glibc up to version 2.0.98 and thus is now replaced.
6643 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6645 * Mark Kettenis provided a Hesiod NSS module.
6647 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6648 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6650 * rcmd can now handle netgroups (Dick Streefland).
6652 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6655 * Support for the IPv6 protocol has been added to the socket API, as per the
6656 latest draft standards.
6658 * Support for Linux 2.2 has been added.
6660 * Interface changes relative to the latest 2.0.x release:
6661 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6662 addseverity NEW: Unix98
6663 alphasort64 NEW: LFS
6664 argp_err_exit_status NEW: argp, GNU ext
6665 argp_error NEW: argp, GNU ext
6666 argp_failure NEW: argp, GNU ext
6667 argp_help NEW: argp, GNU ext
6668 argp_parse NEW: argp, GNU ext
6669 argp_program_bug_address NEW: argp, GNU ext
6670 argp_program_version NEW: argp, GNU ext
6671 argp_program_version_hook NEW: argp, GNU ext
6672 argp_state_help NEW: argp, GNU ext
6673 argp_usage NEW: argp, GNU ext
6674 authdes_create NEW: Secure RPC
6675 authdes_getucred NEW: Secure RPC
6676 authdes_pk_create NEW: Secure RPC
6677 backtrace NEW: GNU ext.
6678 backtrace_symbols NEW: GNU ext.
6679 backtrace_symbols_fd NEW: GNU ext.
6681 cacosf NEW: ISO C 9x
6682 cacosh NEW: ISO C 9x
6683 cacoshf NEW: ISO C 9x
6684 cacoshl NEW: ISO C 9x
6685 cacosl NEW: ISO C 9x
6692 casinf NEW: ISO C 9x
6693 casinh NEW: ISO C 9x
6694 casinhf NEW: ISO C 9x
6695 casinhl NEW: ISO C 9x
6696 casinl NEW: ISO C 9x
6698 catanf NEW: ISO C 9x
6699 catanh NEW: ISO C 9x
6700 catanhf NEW: ISO C 9x
6701 catanhl NEW: ISO C 9x
6702 catanl NEW: ISO C 9x
6703 cbc_crypt NEW: Secure RPC
6707 ccoshf NEW: ISO C 9x
6708 ccoshl NEW: ISO C 9x
6714 cimagf NEW: ISO C 9x
6715 cimagl NEW: ISO C 9x
6716 clearerr_locked REMOVED
6717 clntunix_create NEW: sunrpc ext
6719 clog10 NEW: ISO C 9x
6720 clog10f NEW: ISO C 9x
6721 clog10l NEW: ISO C 9x
6731 cprojf NEW: ISO C 9x
6732 cprojl NEW: ISO C 9x
6734 crealf NEW: ISO C 9x
6735 creall NEW: ISO C 9x
6740 csinhf NEW: ISO C 9x
6741 csinhl NEW: ISO C 9x
6744 csqrtf NEW: ISO C 9x
6745 csqrtl NEW: ISO C 9x
6749 ctanhf NEW: ISO C 9x
6750 ctanhl NEW: ISO C 9x
6752 des_setparity NEW: Secure RPC
6753 ecb_crypt NEW: Secure RPC
6754 endutxent NEW: Unix98
6756 exp10f NEW: ISO C 9x
6757 exp10l NEW: ISO C 9x
6761 fattach NEW: STREAMS
6762 fdetach NEW: STREAMS
6766 feclearexcept NEW: ISO C 9x
6767 fegetenv NEW: ISO C 9x
6768 fegetexceptflag NEW: ISO C 9x
6769 fegetround NEW: ISO C 9x
6770 feholdexcept NEW: ISO C 9x
6772 feraiseexcept NEW: ISO C 9x
6773 ferror_locked REMOVED
6774 fesetenv NEW: ISO C 9x
6775 fesetexceptflag NEW: ISO C 9x
6776 fesetround NEW: ISO C 9x
6777 fetestexcept NEW: ISO C 9x
6778 feupdateenv NEW: ISO C 9x
6779 fflush_locked REMOVED
6783 fgets_unlocked NEW: GNU ext.
6784 fileno_locked REMOVED
6796 fputc_locked REMOVED
6797 fputs_unlocked NEW: GNU ext.
6798 fread_unlocked NEW: GNU ext.
6803 fstatvfs NEW: Unix98
6807 ftruncate64 NEW: LFS
6809 fwrite_unlocked NEW: GNU ext.
6810 gai_strerror NEW: IPv6
6814 getchar_locked REMOVED
6816 getdate_err NEW: Unix98
6817 getdate_r NEW: GNU ext.
6819 getnameinfo NEW: IPv6
6820 getnetname NEW: Secure RPC
6821 getpmsg NEW: STREAMS
6822 getpt NEW: Unix98 PTY
6823 getrlimit64 NEW: LFS
6824 getutxent NEW: Unix98
6825 getutxid NEW: Unix98
6826 getutxline NEW: Unix98
6827 glob64 NEW: GNU ext.
6828 globfree64 NEW: GNU ext.
6829 gnu_get_libc_release NEW: GNU ext.
6830 gnu_get_libc_version NEW: GNU ext.
6831 grantpt NEW: Unix98 PTY
6832 host2netname NEW: Secure RPC
6834 iconv_close NEW: iconv
6835 iconv_open NEW: iconv
6836 if_freenameindex NEW: IPv6
6837 if_indextoname NEW: IPv6
6838 if_nameindex NEW: IPv6
6839 if_nametoindex NEW: IPv6
6840 in6addr_any NEW: IPv6
6841 in6addr_loopback NEW: IPv6
6842 inet6_isipv4mapped NEW: IPv6
6843 isastream NEW: STREAMS
6844 iswblank NEW: GNU ext.
6845 key_decryptsession NEW: Secure RPC
6846 key_decryptsession_pk NEW: Secure RPC
6847 key_encryptsession NEW: Secure RPC
6848 key_encryptsession_pk NEW: Secure RPC
6849 key_gendes NEW: Secure RPC
6850 key_get_conv NEW: Secure RPC
6851 key_secretkey_is_set NEW: Secure RPC
6852 key_setnet NEW: Secure RPC
6853 key_setsecret NEW: Secure RPC
6854 llrint NEW: ISO C 9x
6855 llrintf NEW: ISO C 9x
6856 llrintl NEW: ISO C 9x
6857 llround NEW: ISO C 9x
6858 llroundf NEW: ISO C 9x
6859 llroundl NEW: ISO C 9x
6864 lrintf NEW: ISO C 9x
6865 lrintl NEW: ISO C 9x
6866 lround NEW: ISO C 9x
6867 lroundf NEW: ISO C 9x
6868 lroundl NEW: ISO C 9x
6870 makecontext NEW: Unix98
6871 mempcpy NEW: GNU ext.
6874 modify_ldt NEW: kernel
6878 nearbyint NEW: ISO C 9x
6879 nearbyintf NEW: ISO C 9x
6880 nearbyintl NEW: ISO C 9x
6881 netname2host NEW: Secure RPC
6882 netname2user NEW: Secure RPC
6883 nexttoward NEW: ISO C 9x
6884 nexttowardf NEW: ISO C 9x
6885 nexttowardl NEW: ISO C 9x
6889 passwd2des NEW: Secure RPC
6891 pow10f NEW: GNU ext.
6892 pow10l NEW: GNU ext.
6895 printf_size NEW: GNU ext.
6896 printf_size_info NEW: GNU ext.
6897 profil_counter REMOVED
6898 pthread_mutexattr_getkind_np REPLACED
6899 pthread_mutexattr_setkind_np REPLACED
6900 ptsname NEW: Unix98 PTY
6901 ptsname_r NEW: Unix98 PTY
6903 putchar_locked REMOVED
6904 putgrent NEW: GNU ext.
6906 putpmsg NEW: STREAMS
6907 pututxline NEW: Unix98
6911 readdir64_r NEW: LFS
6912 remquo NEW: ISO C 9x
6913 remquof NEW: ISO C 9x
6914 remquol NEW: ISO C 9x
6916 roundf NEW: ISO C 9x
6917 roundl NEW: ISO C 9x
6919 scalbln NEW: ISO C 9x
6920 scalblnf NEW: ISO C 9x
6921 scalblnl NEW: ISO C 9x
6923 sendfile NEW: kernel
6924 setcontext NEW: Unix98
6925 setrlimit64 NEW: LFS
6926 setutxent NEW: Unix98
6928 sigignore NEW: Unix98
6929 sigqueue NEW: POSIX.1b
6930 sigrelse NEW: Unix98
6931 sigset NEW: POSIX.1b
6932 sigtimedwait NEW: POSIX.1b
6933 sigwaitinfo NEW: POSIX.1b
6934 sincos NEW: GNU ext.
6935 sincosf NEW: GNU ext.
6936 sincosl NEW: GNU ext.
6940 strcasestr NEW: GNU ext.
6941 strtoimax NEW: ISO C 9x
6942 strtoumax NEW: ISO C 9x
6943 strverscmp NEW: GNU ext.
6944 svcauthdes_stats NEW: Secure RPC
6945 svcunix_create NEW: sunrpc etx
6946 svcunixfd_create NEW: sunrpc ext
6947 swapcontext NEW: Unix98
6948 tcgetsid NEW: Unix98 PTY
6949 tdestroy NEW: GNU ext.
6950 tgamma NEW: ISO C 9x
6951 tgammaf NEW: ISO C 9x
6952 tgammal NEW: ISO C 9x
6956 truncf NEW: ISO C 9x
6957 truncl NEW: ISO C 9x
6959 unlockpt NEW: Unix98 PTY
6960 updwtmpx NEW: Unix98
6961 user2netname NEW: Secure RPC
6962 utmpxname NEW: Unix98
6963 versionsort NEW: GNU ext.
6964 versionsort64 NEW: GNU ext.
6966 wcscasecmp NEW: GNU ext.
6967 wcsncasecmp NEW: GNU ext.
6968 wcsnlen NEW: GNU ext.
6969 wcstoimax NEW: ISO C 9x
6970 wcstoll NEW: ISO C 9x
6971 wcstoull NEW: ISO C 9x
6972 wcstoumax NEW: ISO C 9x
6974 wordexp NEW: POSIX.2
6975 wordfree NEW: POSIX.2
6976 write_profiling REMOVED
6977 xdecrypt NEW: Secure RPC
6978 xdr_authdes_cred NEW: Secure RPC
6979 xdr_authdes_verf NEW: Secure RPC
6980 xdr_cryptkeyarg NEW: Secure RPC
6981 xdr_cryptkeyarg2 NEW: Secure RPC
6982 xdr_cryptkeyres NEW: Secure RPC
6983 xdr_getcredres NEW: Secure RPC
6984 xdr_key_netstarg NEW: Secure RPC
6985 xdr_key_netstres NEW: Secure RPC
6986 xdr_keybuf NEW: Secure RPC
6987 xdr_keystatus NEW: Secure RPC
6988 xdr_netnamestr NEW: Secure RPC
6989 xdr_sizeof NEW: Secure RPC
6990 xdr_unixcred NEW: sunrpc ext
6991 xencrypt NEW: Secure RPC
6992 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7003 * inet_ntoa is thread-safe
7005 * updwtmp is moved from libutil to libc
7007 * rewrite of cbrt function
7009 * update of timezone data
7023 * add atoll function
7025 * fix complex problems in Berkeley DB code
7027 * fix math functions
7031 * fixed lots of header problems (especially Linux/GNU specific)
7033 * dynamic loader preserves all registers
7035 * Roland McGrath provided support for handling of auxiliary objects in
7036 the ELF dynamic loader.
7038 * support for parallel builds is improved
7042 * GNU extensions are no longer declared by default. To enable them you
7043 must define the macro `_GNU_SOURCE' in your program or compile with
7046 * The library has changed from using GNU ld symbol aliases to using weak
7047 symbols where available. The ELF object file format supports weak
7048 symbols; GNU ld also supports weak symbols in the a.out format. (There
7049 is also now support for other GNU ld extensions in ELF. Use the
7050 `--with-elf' option to configure to indicate you have ELF, and
7051 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7052 of many files which contained only symbol aliases, reducing the size of
7053 the source and the compiled library; many other files were renamed to
7054 less cryptic names previously occupied by the symbol alias files.
7055 There is a new header file <elf.h> for programs which operate on
7056 files in the ELF format.
7058 * Converted to Autoconf version 2, so `configure' has more options.
7059 Run `configure --help' to see the details.
7061 * The library can now be configured to build profiling, highly-optimized
7062 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7063 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7064 `configure' enable building these extra libraries. The shared library is
7065 built by default when using both ELF and GNU ld. When shared libraries
7066 are enabled, the new library `-ldl' is available for arbitrary run-time
7067 loading of shared objects; its interface is defined in <dlfcn.h>. The
7068 new header file <link.h> gives access to the internals of the run-time
7069 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7070 application of same name on other systems and it provides information
7071 about dynamically linked binaries.
7073 * The C library now provides the run-time support code for profiling
7074 executables compiled with `-pg'. Programs can control the profiling code
7075 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7076 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7077 the support for this file format was contributed by David Mosberger-Tang.
7079 * The math code has been replaced with a math library based on fdlibm from
7080 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7081 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7082 functions. The math functions now reside in a separate library, so
7083 programs using them will need to use `-lm' their linking commands.
7085 * John C. Bowman contributed optimized ix87 assembler inline functions.
7087 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7088 mechanism similar to that found in Solaris 2. This is now used for the
7089 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7090 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7091 file controls what services are used for each individual database. This
7092 works by loading shared libraries with names specified in `nsswitch.conf',
7093 so service modules can be changed or added at any time without even
7094 relinking any program. Currently there are the file, db, and NIS based
7095 NSS services available.
7097 * The new functions `strtoq' and `strtouq' parse integer values from
7098 strings, like `strtol' and `strtoul', but they return `long long int' and
7099 `unsigned long long int' values, respectively (64-bit quantities).
7101 * The new functions `strtof' and `strtold' parse floating-point values from
7102 strings, like `strtod', but they return `float' and `long double' values,
7103 respectively (on some machines `double' and `long double' are the same).
7105 * Ulrich Drepper has contributed new implementations of the floating-point
7106 printing and reading code used in the `printf' family of functions and
7107 `strtod', `strtof', and `strtold'. These new functions are perfectly
7108 accurate, and much faster than the old ones.
7110 * The implementation of the POSIX locale model was completely rewritten by
7111 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7112 to compile the POSIX locale definition.
7114 * The former dummy implementations of the strcoll and strxfrm function are
7115 now replaced by fully functional code contributed by Ulrich Drepper. The
7116 collation information comes from the POSIX locale definitions.
7118 * The new header <langinfo.h> defines an interface for accessing
7119 various locale-dependent data (using the locale chosen with `setlocale').
7121 * Ulrich Drepper has contributed a new suite of functions for operation on
7122 wide-character and multibyte-character strings, in <wchar.h>;
7123 and classification and case conversion of wide characters, in <wctype.h>.
7124 These new functions are conforming to the ISO C, Amendment 1 specification.
7126 * There is now a second implementation of the standard I/O library available.
7127 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7128 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7130 * You can now use positional parameter specifications in format strings
7131 for the `printf' and `scanf' families of functions. For example,
7132 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7133 ``Number 6, Mr Jones''. This is mainly useful when providing different
7134 format strings for different languages, whose grammars may dictate
7135 different orderings of the values being printed. To support this
7136 feature, the interface for `register_printf_handler' has changed; see
7137 the header file <printf.h> for details.
7139 * The `printf' and `scanf' families of functions now understand a new
7140 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7141 to group numbers as indicated by the locale; for `scanf' and friends, this
7142 says to accept as valid only a number with all the proper grouping
7143 separators in the right places. In the default "C" locale, numbers are
7144 not grouped; but locales for specific countries will define the usual
7145 conventions (i.e. separate thousands with `,' in the US locale).
7147 * The pgrp functions have been regularized, slightly incompatibly but much
7148 less confusingly. The core functions are now `getpgid' and `setpgid',
7149 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7150 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7151 provided for compatibility. There is no longer an incompatible `getpgrp'
7152 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7154 * The new header file <fts.h> and suite of functions simplify programs that
7155 operate on directory trees. This code comes from 4.4 BSD.
7157 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7158 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7159 NSS scheme used in glibc.
7161 * There is a new malloc debugging hook `__memalign_hook'.
7163 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7164 `unsigned int' in <sys/types.h>. These are for compatibility only and
7165 their use is discouraged.
7167 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7168 done differently, so that it works even without GNU ld.
7170 * New function `euidaccess' checks allowed access to a file like `access',
7171 but using the effective IDs instead of the real IDs.
7173 * The time zone data files have been updated for the latest and greatest
7174 local time conventions of the countries of the world.
7176 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7179 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7180 for formatting floating-point numbers. They are provided only for
7181 compatibility; new programs should use `sprintf' instead. There are
7182 also equivalent function for the `long double' floating-point type and
7183 all functions also exist in a reentrant form.
7185 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7186 functions for maintaining the login-record files (primarily of use to
7187 system programs such as `login'), and convenient functions for
7188 allocating and initializing a pseudo-terminal (pty) device.
7190 * Ulrich Drepper has contributed new support for System V style
7191 shared memory and IPC on systems that support it.
7193 * Ulrich Drepper has contributed several miscellaneous new functions found
7194 in System V: The `hsearch' family of functions provide an effective
7195 implementation of hash tables; `a64l' and `l64a' provide a very simple
7196 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7199 * Ulrich Drepper has contributed new reentrant counterparts for the
7200 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7202 * Ulrich Drepper has contributed new, highly-optimized versions of several
7203 string functions for the i486/Pentium family of processors.
7205 * Ulrich Drepper has updated the Linux-specific code, based largely
7206 on work done in Hongjiu Lu's version of GNU libc for Linux.
7207 The GNU library now supports Linux versions 2.0.10 and later,
7208 using the ELF object file format (i[3456]86-*-linux).
7210 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7212 * David Mosberger-Tang and Richard Henderson have ported the C library
7213 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7214 dynamic linking support for ELF/Alpha.
7216 * Richard Henderson contributed several Alpha optimized assembler function
7217 for arithmetic and string handling.
7219 * Ulrich Drepper has contributed a new set of message catalog functions to
7220 support multiple languages using the <libintl.h> interface, for use with
7221 his new package GNU gettext. Translation volunteers have contributed
7222 catalogs of the library's messages in Spanish, German, and Korean.
7224 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7225 program and the `catgets' function for reading the catalog files it
7226 creates. (The <libintl.h> interface is preferred; we include the
7227 <nl_types.h> interface using `catgets' only for source compatibility with
7228 programs already written to use it.)
7230 * New header file <values.h> gives SVID-compatible names for <limits.h>
7233 * Various new macros, declarations, and small header files for compatibility
7236 * New function `group_member' is a convenient way to check if a process has
7237 a given effective group ID.
7239 * When using GCC 2.7 and later, the socket functions are now declared in a
7240 special way so that passing an argument of type `struct sockaddr_in *',
7241 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7242 `struct sockaddr *' type, does not generate a type-clash warning.
7244 * New function `error' declared in header file <error.h> is a convenient
7245 function for printing error messages and optionally exiting; this is the
7246 canonical function used in GNU programs. The new functions `err', `warn',
7247 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7248 doing the same thing.
7250 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7251 POSIX.2 `glob' function to do ~ and {...} expansion.
7253 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7254 `clearenv' which is used in POSIX.9 is also available.
7256 * New function `getsid' returns session ID number on systems that support it.
7258 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7259 files <db.h> and <mpool.h> provide a rich set of functions for several
7260 types of simple databases stored in memory and in files, and <ndbm.h> is
7261 an old `ndbm'-compatible interface using the `db' functions. Link with
7262 `-ldb' to get these functions.
7264 * New macro `strdupa' copies a string like `strdup', but uses local stack
7265 space from `alloca' instead of dynamic heap space from `malloc'.
7267 * New function `strnlen' is like `strlen' but searches only a given maximum
7268 number of characters for the null terminator. `stpncpy', `strndup' and
7269 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7272 * New function `statfs' in header <sys/statfs.h>.
7274 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7275 provide convenient functions for operating on blocks of null-terminated
7278 * A new suite of functions in <utmp.h> handle all the details of reading
7279 and writing the utmp file.
7281 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7284 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7285 completely POSIX compliant and also implemented the extended functionality
7286 to handle alternate digit representation and alternate era date formats.
7288 * Ulrich Drepper provided an implementation of the `strptime' function
7289 defined in XPG4.2 which transforms a string into a `struct tm' value.
7291 * Paul Eggert provided the tzselect shell script as part of the timezone
7292 code. The shell script makes it easy to select the correct timezone
7295 * The implementation of the malloc family of functions is completely replaced
7296 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7297 The implementation uses the mmap function (if available) and it is
7298 optimized for the use in multi threaded programs.
7300 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7301 functions. This new functionality is usable by specifying a special
7302 salt string and it is compatible with implementation on *BSD systems.
7304 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7305 `getsubopt' to handle second level command line options, `bsd_signal'
7306 to access BSD style `signal' functionality, the obsolete `regexp' style
7309 * the `lchown' function is available on system which support this
7312 * The implementation of the shadow password handling function was contributed
7315 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7317 * POSIX.1g support was added. The <sys/select.h> header is available,
7318 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7319 implementation of `getaddrinfo'.
7323 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7325 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7326 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7328 * The new function `daemon' from 4.4 BSD is useful for server programs that
7329 want to put themselves in the background.
7331 * Joel Sherrill has contributed support for several standalone boards that
7332 run without an operating system.
7334 * `printf', `scanf' and friends now accept a `q' type modifier for long
7335 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7337 * All of the code taken from BSD (notably most of the math and networking
7338 routines) has been updated from the BSD 4.4-Lite release.
7340 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7342 * The new functions `getdomainname' and `setdomainname' fetch or change the
7343 YP/NIS domain name. These are system calls which exist on systems which
7346 * The time zone data files have been updated for the latest international
7349 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7350 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7354 * The C library now includes support for Sun RPC, from Sun's free
7355 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7356 are included. (There is still no support for YP.)
7358 * Tom Quinn has contributed a port of the C library to SGI machines running
7359 Irix 4 (mips-sgi-irix4).
7361 * The new `lockf' function is a simplified interface to the locking
7362 facilities of `fcntl', included for compatibility.
7364 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7366 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7368 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7371 * The error message printed by `assert' for a failed assertion now includes
7372 the name of the program (if using GNU ld) and the name of the calling
7373 function (with versions of GCC that support this).
7375 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7377 * The library now includes the <sys/mman.h> header file and memory
7378 management functions `mmap', `munmap', `mprotect', `msync', and
7379 `madvise', on systems that support those facilities.
7381 * The interface for `mcheck' has changed slightly: the function called to
7382 abort the program when an allocation inconsistency is detected now takes
7383 an argument that indicates the type of failure. The new function
7384 `mprobe' lets you request a consistency check for a particular block at
7385 any time (checks are normally done only when you call `free' or `realloc'
7388 * It is now possible to easily cross-compile the C library, building on one
7389 system a library to run on another machine and/or operating system. All
7390 you need to do is set the variable `HOST_CC' in `configparms' to the
7391 native compiler for programs to run on the machine you are building on (a
7392 few generator programs are used on Unix systems); set `CC' to the
7395 * The new function `fexecve' (only implemented on the GNU system) executes
7396 a program file given a file descriptor already open on the file.
7400 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7401 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7403 * You can set the variable `libprefix' in `configparms' to specify a prefix
7404 to be prepended to installed library files; this makes it easy to install
7405 the GNU C library to be linked as `-lgnuc' or whatever.
7407 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7408 copies a limited number of characters from a string, and returns the
7409 address of the last character written.
7411 * You no longer need to check for whether the installed `stddef.h' is
7412 compatible with the GNU C library. configure now checks for you.
7414 * You can now define a per-stream `fileno' function to convert the
7415 stream's cookie into an integral file descriptor.
7417 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7418 allocates zero bytes of storage, and returns a unique pointer which
7419 you can pass to `realloc' or `free'. The behavior is undefined if
7420 you dereference this pointer.
7422 * The C library now runs on Sony NEWS m68k machines running either
7423 NewsOS 3 or NewsOS 4.
7425 * The new `syscall' function is a system-dependent primitive function
7426 for invoking system calls. It has the canonical behavior on Unix
7427 systems, including unreliable return values for some calls (such as
7428 `pipe', `fork' and `getppid').
7430 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7431 to `EAGAIN', which is the preferred name. On systems whose kernels
7432 use two distinct codes, the C library now translates EWOULDBLOCK to
7433 EAGAIN in every system call function.
7437 * The GNU C Library Reference Manual is now distributed with the library.
7438 `make dvi' will produce a DVI file of the printed manual.
7439 `make info' will produce Info files that you can read on line using C-h i
7440 in Emacs or the `info' program.
7441 Please send comments on the manual to bug-glibc-manual@gnu.org.
7443 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7445 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7447 * Jason Merrill has contributed a port to the Sequent Symmetry running
7448 Dynix version 3 (i386-sequent-dynix).
7450 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7451 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7453 * New function `memory_warnings' lets you arrange to get warnings when
7454 malloc is running out of memory to allocate, like Emacs gives you.
7456 * The C library now contains the relocating allocator used in Emacs 19 for
7457 its editing buffers. This allocator (ralloc) minimizes allocation
7458 overhead and fragmentation by moving allocated regions around whenever it
7459 needs to. You always refer to a ralloc'd region with a "handle" (a
7460 pointer to a pointer--an object of type `void **').
7462 * There is a new `printf' format: `%m' gives you the string corresponding
7463 to the error code in `errno'.
7465 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7466 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7467 pass, the `a' modifier says to fill in a `char **' you pass with a
7470 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7471 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7472 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7474 * `mkstemp' is a traditional Unix function to atomically create and open a
7475 uniquely-named temporary file.
7479 * The standard location for the file that says what the local timezone is
7480 has changed again. It is now `/usr/local/etc/localtime' (or more
7481 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7483 * The distribution no longer contains any files with names longer than 14
7486 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7487 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7489 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7493 * The configuration process has changed quite a bit. The `configure'
7494 script is now used just like the configuration scripts for other GNU
7495 packages. The `sysdeps' directory hierarchy is much rearranged.
7496 The file `INSTALL' explains the new scheme in detail.
7498 * The header files no longer need to be processed into ANSI C and
7499 traditional C versions. There is just one set of files to install, and
7500 it will work with ANSI or old C compilers (including `gcc -traditional').
7502 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7503 MIPS DECStation running Ultrix 4.
7505 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7506 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7507 made itself into a shared library.
7509 * Yet further improved support for the i386, running 4.3 BSD-like systems
7510 (such as Mach 3 with the Unix single-server), or System V.
7512 * New function `strncasecmp' to do case-insensitive string comparison
7513 with limited length.
7515 * New function `strsep' is a reentrant alternative to `strtok'.
7517 * New functions `scandir' and `alphasort' for searching directories.
7519 * New function `setenv' is a better interface to `putenv'.
7521 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7522 function for traversing a directory tree.
7524 * The GNU obstack package is now also part of the C library.
7525 The new function `open_obstack_stream' creates a stdio stream that
7526 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7527 formatted output directly to an obstack.
7529 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7530 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7532 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7534 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7535 things to your strings.
7537 * There are some new test programs: test-fseek, testmb, and testrand.
7539 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7540 These ports are not finished, but are a good starting place for really
7541 supporting those systems.
7543 * `/etc/localtime' is now the standard location for the file that says what
7544 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7545 This follows the general principle that `/etc' is the place for all local
7546 configuration files.
7548 * The C library header files now use `extern "C"' when used by the C++
7549 compiler, so the C library should now work with C++ code.
7551 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7552 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7555 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7556 function which uses the `merge sort' algorithm, and is said to be
7557 significantly faster than the old GNU `qsort' function. Merge sort is
7558 now the standard `qsort' function. The new algorithm can require a lot
7559 of temporary storage; so, the old sorting function is called when the
7560 required storage is not available.
7562 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7563 provides the Unix `crypt' function, plus some other entry points.
7565 * The code and header files taken from 4.4 BSD have been updated with the
7566 latest files released from Berkeley.
7568 ----------------------------------------------------------------------
7571 Permission is granted to anyone to make or distribute verbatim copies
7572 of this document as received, in any medium, provided that the
7573 copyright notice and this permission notice are preserved,
7574 thus giving the recipient permission to redistribute in turn.
7576 Permission is granted to distribute modified versions
7577 of this document, or of portions of it,
7578 under the above conditions, provided also that they
7579 carry prominent notices stating who last changed them.
7582 version-control: never