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 Deprecated and removed features, and other changes affecting compatibility:
36 [Add deprecations, removals and changes affecting compatibility here]
38 Changes to build and runtime requirements:
40 * Building on LoongArch requires at a minimum binutils 2.41 for vector
43 Security related changes:
45 CVE-2023-4527: If the system is configured in no-aaaa mode via
46 /etc/resolv.conf, getaddrinfo is called for the AF_UNSPEC address
47 family, and a DNS response is received over TCP that is larger than
48 2048 bytes, getaddrinfo may potentially disclose stack contents via
49 the returned address data, or crash.
51 CVE-2023-4806: When an NSS plugin only implements the
52 _gethostbyname2_r and _getcanonname_r callbacks, getaddrinfo could use
53 memory that was freed during buffer resizing, potentially causing a
54 crash or read or write to arbitrary memory.
56 CVE-2023-5156: The fix for CVE-2023-4806 introduced a memory leak when
57 an application calls getaddrinfo for AF_INET6 with AI_CANONNAME,
58 AI_ALL and AI_V4MAPPED flags set.
60 The following bugs are resolved with this release:
62 [The release manager will add the list generated by
63 scripts/list-fixed-bugs.py just before the release.]
69 * When C2X features are enabled and the base argument is 0 or 2, the
70 following functions support binary integers prefixed by 0b or 0B as
71 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
72 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
73 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
74 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
75 following functions support binary integers prefixed by 0b or 0B as
76 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
77 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
78 functions also support the %b format for binary integers, with or
79 without such a prefix and independent of standards mode.
81 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
84 * printf-family functions now support the wN format length modifiers for
85 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
86 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
87 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
88 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
89 specified in draft ISO C2X.
91 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
92 Transparent Huge Pages (THP) in stack allocation at pthread_create.
94 * Support for x86_64 running on Hurd has been added. This port requires
95 as least binutils 2.40 and GCC 13:
99 * Vector math library libmvec support has been added to AArch64. It
100 requires GCC version >= 10.1.0. It can be disabled via
101 "--disable-mathvec", however that is not a supported configuration as
102 it changes the ABI. The symbol names follow the AArch64 vector ABI,
103 they are declared in math.h and have to be called manually at this point.
105 * The strlcpy and strlcat functions have been added. They are derived
106 from OpenBSD, and are expected to be added to a future POSIX version.
108 * A new configure option, "--enable-fortify-source", can be used to build the
109 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
110 provided, or is set to the highest value supported by the compiler. If not
111 explicitly enabled, then fortify source is forcibly disabled so to keep
112 original behavior unchanged.
114 Deprecated and removed features, and other changes affecting compatibility:
116 * libcrypt is no longer built by default; one may use the "--enable-crypt"
117 option to build libcrypt. libcrypt is likely to be removed from the
118 GNU C Library in a future release, so it is recommended that
119 applications port away from it to an alternative such as libxcrypt.
121 * In the Linux kernel for the hppa/parisc architecture some of the
122 MADV_XXX constants were changed to have the same values as the other
123 architectures. New programs compiled with this glibc version and which
124 use the madvise call will require at least Linux kernel version 6.2,
125 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
126 5.4.228, 4.19.270 or 4.14.303.
128 * The "--disable-experimental-malloc" option is no longer available. The
129 per-thread cache can still be disabled per-application using tunables
130 (glibc.malloc.tcache_count set to zero).
132 * The configure option "--enable-tunables" has been removed. The tunable
133 feature is now always enabled.
135 Changes to build and runtime requirements:
137 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
140 Security related changes:
142 CVE-2023-25139: When the printf family of functions is called with a
143 format specifier that uses an <apostrophe> (enable grouping) and a
144 minimum width specifier, the resulting output could be larger than
145 reasonably expected by a caller that computed a tight bound on the
146 buffer size. The resulting larger than expected output could result
147 in a buffer overflow in the printf family of functions.
149 The following bugs are resolved with this release:
151 [178] string: Please add strlcpy and strlcat (attached)
152 [14697] nptl: Behavior of exit is nonconformant with respect to
154 [15142] stdio: Missing locking in _IO_cleanup
155 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
156 [18906] stdio: fopen: ccs value may affect open mode
157 [24466] stdio: Feature request: provide special printf formats for
159 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
160 [28519] libc: system and popen should pass "--" between /bin/sh and
162 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
163 [29591] string: wcsnlen length can overflow in page cross case.
164 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
165 [30068] stdio: incorrect printf output for integers with thousands
166 separator and width field (CVE-2023-25139)
167 [30111] time: support_descriptors_list fails after 2038 on 32 bits
169 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
170 symlink for libraries without soname
171 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
173 [30156] time: Potential ntp_gettime abi break
174 [30235] libc: Missing fallback in getlogin if loginuid is unset
175 [30258] dynamic-link: sprof cannot read and display shared object
176 profiling data correctly
177 [30263] libc: Add test coverage for abs(), labs(), and llabs().
178 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
179 [30402] libc: FAIL: elf/tst-glibcelf
180 [30425] dynamic-link: Symbol lookup during dlclose may fail
182 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
183 [30477] libc: [RISCV]: time64 does not work on riscv32
184 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
186 [30527] network: resolv_conf lock not unlocked on allocation failure
187 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
189 [30555] string: strerror can incorrectly return NULL
190 [30579] malloc: trim_threshold in realloc lead to high memory usage
191 [30662] nscd: Group and password cache use errno in place of errval
197 * The getent tool now supports the --no-addrconfig option. The output of
198 getent with --no-addrconfig may contain addresses of families not
199 configured on the current host i.e. as-if you had not passed
200 AI_ADDRCONFIG to getaddrinfo calls.
202 Deprecated and removed features, and other changes affecting compatibility:
204 * The dynamic linker no longer loads shared objects from the "tls"
205 subdirectories on the library search path or the subdirectory that
206 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
207 search mechanism, which was deprecated in version 2.33.
209 Security related changes:
211 CVE-2022-39046: When the syslog function is passed a crafted input
212 string larger than 1024 bytes, it reads uninitialized memory from the
213 heap and prints it to the target log file, potentially revealing a
214 portion of the contents of the heap.
216 The following bugs are resolved with this release:
218 [12154] network: Cannot resolve hosts which have wildcard aliases
219 [12165] libc: readdir: Do not skip entries with zero d_ino values
220 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
221 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
222 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
223 AF_INET6 address (ie docker)
224 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
226 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
227 [28937] dynamic-link: New DSO dependency sorter does not put new map
229 [29249] libc: csu/libc-tls.c:202: undefined reference to
230 `_startup_fatal_not_constant'
231 [29305] network: Inefficient buffer space usage in nss_dns for
232 gethostbyname and other functions
233 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
234 [29402] nscd: nscd: No such file or directory
235 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
237 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
238 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
240 [29463] math: math/test-float128-y1 fails on x86_64
241 [29485] build: Make hangs when the test misc/tst-pidfile returns
243 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
245 [29499] build: Check failed on misc/tst-glibcsyscalls while building
246 for RISCV64 on a unmatched hardware
247 [29501] build: Check failed on stdlib/tst-strfrom while building for
248 RISCV64 on a unmatched hardware
249 [29502] libc: alpha sys/acct.h out of date
250 [29514] build: Need to use -fPIE not -fpie
251 [29528] dynamic-link: __libc_early_init not called after dlmopen that
253 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
254 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
256 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
258 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
260 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
261 [29576] build: librtld.os: in function `_dl_start_profile':
262 (.text+0x9444): undefined reference to `strcpy'
263 [29578] libc: Definition of SUN_LEN() is wrong
264 [29583] build: iconv failures on 32bit platform due to missing large
266 [29600] dynamic-link: dlmopen hangs after loading certain libraries
267 [29604] localedata: Update locale data to Unicode 15.0.0
268 [29605] nscd: Regression in NSCD backend of getaddrinfo
269 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
271 [29611] string: Optimized AVX2 string functions unconditionally use
273 [29624] malloc: errno is not cleared when entering main
274 [29638] libc: stdlib: arc4random fallback is never used
275 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
277 [29698] build: Configuring for AArch32 on ARMv8+ disables
279 [29727] locale: __strtol_internal out-of-bounds read when parsing
281 [29730] libc: broken y2038 support in fstatat on MIPS N64
282 [29746] libc: ppoll() does not switch to __ppoll64 when
283 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
284 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
285 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
286 aux.S: No such file or directory)
287 [29864] libc: __libc_start_main() should obtain program headers
288 address (_dl_phdr) from the auxv, not the ELF header.
289 [29951] time: daylight variable not set correctly if last DST change
290 coincides with offset change
291 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
292 length in fortify mode
298 * Support for DT_RELR relative relocation format has been added to
299 glibc. This is a new ELF dynamic tag that improves the size of
300 relative relocations in shared object files and position independent
301 executables (PIE). DT_RELR generation requires linker support for
302 -z pack-relative-relocs option, which is supported for some targets
303 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
305 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
306 have been added. The pidfd functionality provides access to a process
307 while avoiding the issue of PID reuse on traditional Unix systems.
309 * On Linux, the process_madvise function has been added. It has the
310 same functionality as madvise but alters the target process identified
313 * On Linux, the process_mrelease function has been added. It allows a
314 caller to release the memory of a dying process. The release of the
315 memory is carried out in the context of the caller, using the caller's
316 CPU affinity, and priority with CPU usage accounted to the caller.
318 * The “no-aaaa” DNS stub resolver option has been added. System
319 administrators can use it to suppress AAAA queries made by the stub
320 resolver, including AAAA lookups triggered by NSS-based interfaces
321 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
322 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
323 produce IPv6 addresses, and configured IPv6 name servers are still
324 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
325 are translated to A queries. The new resolver option is intended
326 primarily for diagnostic purposes, to rule out that AAAA DNS queries
327 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
328 validation by applications.
330 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
331 and mount_setattr have been added. They are part of the new Linux kernel
332 mount APIs that allow applications to more flexibly configure and operate
333 on filesystem mounts. The new mount APIs are specifically designed to work
336 * localedef now accepts locale definition files encoded in UTF-8.
337 Previously, input bytes not within the ASCII range resulted in
338 unpredictable output.
340 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
341 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
342 Support for the char8_t typedef has been added per the ISO C2X N2653
343 proposal. The functions are declared in uchar.h in C2X mode or when the
344 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
345 The char8_t typedef is declared in uchar.h in C2X mode or when the
346 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
347 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
349 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
350 added. The functions wrap getrandom and/or /dev/urandom to return high-
351 quality randomness from the kernel.
353 * Support for LoongArch running on Linux has been added. This port requires
354 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
357 - loongarch64-linux-gnu
359 The LoongArch ABI is 64-bit little-endian.
361 Deprecated and removed features, and other changes affecting compatibility:
363 * Support for prelink will be removed in the next release; this includes
364 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
365 variables and their functionality in the dynamic loader.
367 * The Linux kernel version check has been removed along with the
368 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
369 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
370 when libc.so is issued directly.
372 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
374 The following bugs are resolved with this release:
376 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
377 return different result with versioned "foo"
378 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
380 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
381 ./exe and ld.so adjusts argv on the stack
382 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
384 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
385 consuming the second byte of certain double byte characters
386 [25812] stdio: Libio vtable protection is sometimes only partially
388 [27054] libc: pthread_atfork handlers that call pthread_atfork
390 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
392 [28128] build: declare_symbol_alias doesn't work for assembly codes
393 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
394 [28752] nss: Segfault in getpwuid when stat fails
395 [28815] libc: realpath should not copy to resolved buffer on error
396 [28828] stdio: fputwc crashes
397 [28838] libc: FAIL: elf/tst-p_align3
398 [28845] locale: ld-monetary.c should be updated to match ISO C and
400 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
402 [28852] libc: getaddrinfo leaks memory with AI_ALL
403 [28853] libc: tst-spawn6 changes current foreground process group
404 (breaks test isolation)
405 [28857] libc: FAIL: elf/tst-audit24a
406 [28860] build: --enable-kernel=5.1.0 build fails because of missing
407 __convert_scm_timestamps
408 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
409 inaccurate without /sys and /proc
410 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
412 [28880] libc: Program crashes if date beyond 2038
413 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
414 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
415 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
416 rtm variants when avoiding overflow
417 [28922] build: The .d dependency files aren't always generated
418 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
420 [28936] build: nm: No such file
421 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
422 [28953] nss: NSS lookup result can be incorrect if function lookup
424 [28970] math: benchtest: libmvec benchmark doesn't build with make
426 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
427 /sys/devices/system/cpu/possible
428 [28993] libc: closefrom() iterates until max int if no access to
430 [28996] libc: realpath fails to copy partial result to resolved buffer
432 [29027] math: [ia64] fabs fails with sNAN input
433 [29029] nptl: poll() spuriously returns EINTR during thread
434 cancellation and with cancellation disabled
435 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
436 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
437 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
438 is promoted to global scope
439 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
440 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
441 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
443 [29097] time: fchmodat does not handle 64 bit time_t for
445 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
447 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
448 [29162] string: [PATCH] string.h syntactic error:
449 include/bits/string_fortified.h:110: error: expected ',' or ';'
450 before '__fortified_attr_access'
451 [29165] libc: [Regression] broken argv adjustment
452 [29187] dynamic-link: [regression] broken argv adjustment for nios2
453 [29193] math: sincos produces a different output than sin/cos
454 [29197] string: __strncpy_power9() uses uninitialised register vs18
455 value for filling after \0
456 [29203] libc: daemon is not y2038 aware
457 [29204] libc: getusershell is not 2038 aware
458 [29207] libc: posix_fallocate fallback implementation is not y2038
460 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
461 [29209] libc: isfdtype is not y2038 aware
462 [29210] network: ruserpass is not y2038 aware
463 [29211] libc: __open_catalog is not y2038 aware
464 [29213] libc: gconv_parseconfdir is not y2038 aware
465 [29214] nptl: pthread_setcanceltype fails to set type
466 [29225] network: Mistyped define statement in socket/sys/socket.h in
468 [29274] nptl: __read_chk is not a cancellation point
469 [29279] libc: undefined reference to `mbstowcs_chk' after
470 464d189b9622932a75302290625de84931656ec0
471 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
472 correct for !__ASSUME_TIME64_SYSCALLS
473 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
474 missing on microblaze with largefile
480 * Unicode 14.0.0 Support: Character encoding, character type info, and
481 transliteration tables are all updated to Unicode 14.0.0, using
482 generator scripts contributed by Mike FABIAN (Red Hat).
484 * Bump r_version in the debugger interface to 2 and add a new field,
485 r_next, support multiple namespaces.
487 * Support for the C.UTF-8 locale has been added to glibc. The locale
488 supports full code-point sorting for all valid Unicode code points. A
489 limitation in the framework for fnmatch, regexec, and regcomp requires
490 a compromise to save space and only ASCII-based range expressions are
491 supported for now (see bug 28255). The full size of the locale is
492 only ~400KiB, with 346KiB coming from LC_CTYPE information for
493 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
494 in various downstream distributions. The locale is not built into
495 glibc, and must be installed.
497 * <math.h> functions that round their results to a narrower type, and
498 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
499 18661-3:2015 and draft ISO C2X:
501 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
502 fMxsqrtfN and fMxsqrtfNx functions.
504 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
507 * <math.h> functions for floating-point maximum and minimum,
508 corresponding to new operations in IEEE 754-2019, and corresponding
509 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
510 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
511 fminimum_mag, fminimum_mag_num and corresponding functions for float,
512 long double, _FloatN and _FloatNx.
514 * <math.h> macros for single-precision float constants are added as a
515 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
516 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
519 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
520 predefined as specified in TS 18661-1:2014.
522 * The exp10 functions in <math.h> now have a corresponding type-generic
525 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
527 * printf-family functions now support the %b format for output of
528 integers in binary, as specified in draft ISO C2X, and the %B variant
529 of that format recommended by draft ISO C2X.
531 * A new DSO sorting algorithm has been added in the dynamic linker that uses
532 topological sorting by depth-first search (DFS), solving performance issues
533 of the existing sorting algorithm when encountering particular circular
534 object dependency cases.
536 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
537 the two DSO sorting algorithms. The default setting of '2' uses the
538 new DFS-based algorithm. The setting '1' switches to the old
539 algorithm used in glibc 2.33 and earlier.
541 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
542 to be used by compilers for optimizing usage of 'memcmp' when its
543 return value is only used for its boolean status.
545 * Support for automatically registering threads with the Linux rseq
546 system call has been added. This system call is implemented starting
547 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
548 operations on per-cpu data. It allows user-space to perform updates
549 on per-cpu data without requiring heavy-weight atomic operations.
550 Automatically registering threads allows all libraries, including
551 libc, to make immediate use of the rseq support by using the
552 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
553 variables. The GNU C Library manual has details on integration of
554 Restartable Sequences.
556 * A symbolic link to the dynamic linker is now installed under
557 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
559 * All programs and the testsuite in glibc are now built as position independent
560 executables (PIE) by default on toolchains and architectures that support it.
561 Further, if the toolchain and architecture supports it, even static programs
562 are built as PIE and the resultant glibc can be used to build static PIE
563 executables. A new option --disable-default-pie has been added to disable
564 this behavior and get a non-PIE build. This option replaces
565 --enable-static-pie, which no longer has any effect on the build
568 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
569 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
570 or to use huge pages directly with mmap calls with the MAP_HUGETLB
571 flags). The former can improve performance when Transparent Huge Pages
572 is set to 'madvise' mode while the latter uses the system reserved
575 * The printf family of functions now handles the flagged %#m conversion
576 specifier, printing errno as an error constant (similar to strerrorname_np).
578 * The function _dl_find_object has been added. In-process unwinders
579 can use it to efficiently locate unwinding information for a code
582 * Support for OpenRISC running on Linux has been added. This port requires
583 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
588 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
589 64-bit file offsets (LFS default).
591 * A new configure option, --with-rtld-early-cflags, can be used to
592 specify additional compiler flags for building the early startup code
593 of the dynamic linker. On targets which have CPU compatibility
594 checks, this can help to ensure that proper diagnostics are printed if
595 the dynamic loader runs on an incompatible CPU.
597 * On Linux, the epoll_pwait2 function has been added. It is similar to
598 epoll_wait with the difference the timeout has nanoseconds resolution.
600 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
601 enabling posix_spawn and posix_spawnp to set the controlling terminal in
602 the new process in a race free manner. This function is a GNU extension.
604 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
605 applications compiling with glibc and gcc 12 and later. Level 3 leverages
606 the __builtin_dynamic_object_size function to deliver additional
607 fortification balanced against additional runtime cost (checking non-constant
610 * The audit libraries will avoid unnecessary slowdown if it is not required
611 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
613 Deprecated and removed features, and other changes affecting compatibility:
615 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
616 has been removed since the first PT_LOAD segment is no longer executable
617 due to defaulting to -z separate-code.
619 * The r_version update in the debugger interface makes the glibc binary
620 incompatible with GDB binaries built without the following commits:
622 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
623 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
625 when audit modules or dlmopen are used.
627 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
629 * The --enable-static-pie option is no longer available. The glibc build
630 configuration script now automatically detects static-pie support in the
631 toolchain and architecture and enables it if available.
633 * The catchsegv script and associated libSegFault.so shared object have
634 been removed. There are widely-deployed out-of-process alternatives for
635 catching coredumps and backtraces.
637 * Support for prelink will be removed in the next release; this includes
638 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
639 variables and their functionality in the dynamic loader.
641 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
642 functionality to obtain the program mapping address can be achieved by
643 using LD_TRACE_LOADED_OBJECTS to value of 2.
645 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
646 support prelink PIE binaries.
648 Changes to build and runtime requirements:
650 * The audit module interface version LAV_CURRENT is increased to enable
651 proper bind-now support. The loader now advertises via the la_symbind
652 flags that PLT trace is not possible. New audit modules require the
653 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
654 modules are still loaded for all targets except aarch64.
656 * The audit interface on aarch64 is extended to support both the indirect
657 result location register (x8) and NEON Q register. Old audit modules are
658 rejected by the loader. Audit modules must be rebuilt to use the newer
659 structure sizes and the latest module interface version for LAV_CURRENT.
661 Security related changes:
663 CVE-2022-23219: Passing an overlong file name to the clnt_create
664 legacy function could result in a stack-based buffer overflow when
665 using the "unix" protocol. Reported by Martin Sebor.
667 CVE-2022-23218: Passing an overlong file name to the svcunix_create
668 legacy function could result in a stack-based buffer overflow.
670 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
671 function could result in a memory leak and potential access of
672 uninitialized memory. Reported by Qualys.
674 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
675 function may result in an off-by-one buffer underflow and overflow
676 when the current working directory is longer than PATH_MAX and also
677 corresponds to the / directory through an unprivileged mount
678 namespace. Reported by Qualys.
680 The following bugs are resolved with this release:
682 [12889] nptl: Race condition in pthread_kill
683 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
684 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
685 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
687 [15333] libc: Use 64-bit stat functions in installed programs
688 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
690 [15971] dynamic-link: No interface for debugger access to libraries
692 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
693 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
694 deeply nested DSO dependencies.
695 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
696 ID whose lifetime has not ended
697 [22542] network: buffer overflow in sunrpc clnt_create
699 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
701 [25947] malloc: memory leak in muntrace
702 [26045] math: fmaxf(inf, nan) does not always work
703 [26108] math: exp10() has problems with <tgmath.h>
704 [26779] build: benign use after realloc at localealias.c:329
705 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
706 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
707 [27945] build: build-many-glibcs.py doesn't configure GCC with
708 --enable-initfini-array
709 [27991] build: x86: sysdeps/x86/configure.ac breaks when
710 libc_cv_include_x86_isa_level is loaded from cache
711 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
712 in __REDIRECT_NTH macro
713 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
714 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
716 [28126] libc: nftw aborts for paths longer than PATH_MAX
717 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
718 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
720 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
721 [28185] math: Inaccurate j0f function (again)
722 [28199] locale: iconvconfig prefix flag behaves differently in glibc
724 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
725 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
727 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
728 [28223] libc: mips: clone does not align stack
729 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
731 [28256] malloc: Conditional jump or move depends on uninitialised
732 value(s) in __GI___tunables_init
733 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
734 spawn5 fail if stray fds are open
735 [28310] libc: Do not use affinity mask for sysconf
736 (_SC_NPROCESSORS_CONF)
737 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
739 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
741 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
742 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
744 [28353] network: Race condition on __opensock
745 [28357] dynamic-link: deadlock between pthread_create and ctors
746 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
747 [28361] nptl: Fix for bug 12889 causes setxid deadlock
748 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
749 [28390] localedata: Update locale data to Unicode 14.0.0
750 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
752 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
754 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
755 to tgkill (getpid (), gettid())
756 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
757 [28457] dynamic-link: Missing reldepmod4.so dependency for
759 [28469] time: linux: struct timex is not correctly set for 32-bit
760 systems with TIMESIZE=64
761 [28470] regex: Buffer read overrun in regular expression searching
762 [28475] string: Incorrect access attribute on memfrob
763 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
764 spurious NUL character on state reset
765 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
767 [28550] dynamic-link: FAIL: tst-dso-
768 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
770 [28554] build: Undefined generate-md5
771 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
773 [28607] nptl: Masked signals are delivered on thread exit
774 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
775 lack of cpu counting /proc fallback with glibc 2.34
776 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
777 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
778 [28648] dynamic-link: Running ld.so on statically linked binaries
780 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
782 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
783 [28678] nptl: nptl/tst-create1 hangs sporadically
784 [28688] dynamic-link: PT_LOAD p_align check is too strict
785 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
787 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
788 timezones generated by tzcode-2021d and later
789 [28713] math: GCC 12 miscompiles libm
790 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
791 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
792 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
793 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
794 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
795 Assertion `GL(dl_rtld_map).l_libname' failed!
796 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
797 [28757] nptl: GDB printer tests failed with new GDB
798 [28765] math: x86_64 libmvec atan2 accuracy
799 [28766] manual: Document libmvec accuracy
800 [28768] network: Buffer overflow in svcunix_create with long pathnames
802 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
804 [28770] libc: Unexpected return value from realpath() for too long
805 results (CVE-2021-3998)
806 [28771] libc: %ebx optimization macros are incompatible with .altmacro
808 [28780] build: --disable-default-pie doesn't work on static programs
809 [28782] libc: x86-64 ISA level for glibc itself is always
811 [28792] glob: possible wrong behaviour with patterns with double [
813 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
814 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
815 empty mon_decimal_point_wc
822 * In order to support smoother in-place-upgrades and to simplify
823 the implementation of the runtime all functionality formerly
824 implemented in the libraries libpthread, libdl, libutil, libanl has
825 been integrated into libc. New applications do not need to link with
826 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
827 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
828 provided, so that the linker options keep working. Applications which
829 have been linked against glibc 2.33 or earlier continue to load the
830 corresponding shared objects (which are now empty). The integration
831 of those libraries into libc means that additional symbols become
832 available by default. This can cause applications that contain weak
833 references to take unexpected code paths that would only have been
834 used in previous glibc versions when e.g. preloading libpthread.so.0,
835 potentially exposing application bugs.
837 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
838 PTHREAD_STACK_MIN is no longer constant and is redefined to
839 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
840 sets for modern architectural features like Arm SVE.
842 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
843 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
844 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
845 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
846 dynamic sized register sets for modern architectural features like
849 * The dynamic linker implements the --list-diagnostics option, printing
850 a dump of information related to IFUNC resolver operation and
851 glibc-hwcaps subdirectory selection.
853 * On Linux, the function execveat has been added. It operates similar to
854 execve and it is is already used to implement fexecve without requiring
855 /proc to be mounted. However, different than fexecve, if the syscall is not
856 supported by the kernel an error is returned instead of trying a fallback.
858 * The ISO C2X function timespec_getres has been added.
860 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
861 C2X, is supported to enable declarations of functions defined in Annex F
862 of C2X. Those declarations are also enabled when
863 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
864 defined, and when _GNU_SOURCE is defined.
866 * On powerpc64*, glibc can now be compiled without scv support using the
867 --disable-scv configure option.
869 * Add support for 64-bit time_t on configurations like x86 where time_t
870 is traditionally 32-bit. Although time_t still defaults to 32-bit on
871 these configurations, this default may change in future versions.
872 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
873 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
874 only enabled for Linux and the full support requires a minimum kernel
877 * The main gconv-modules file in glibc now contains only a small set of
878 essential converter modules and the rest have been moved into a supplementary
879 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
880 in the same GCONV_PATH. Similarly, external converter modules directories
881 may have supplementary configuration files in a gconv-modules.d directory
882 with names ending with .conf to logically classify the converter modules in
885 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
886 to configure the size of the thread stack cache.
888 * The function _Fork has been added as an async-signal-safe fork replacement
889 since Austin Group issue 62 dropped the async-signal-safe requirement for
890 fork (and it will be included in the future POSIX standard). The new _Fork
891 function does not run any atfork function neither resets any internal state
892 or lock (such as the malloc one), and only sets up a minimal state required
893 to call async-signal-safe functions (such as raise or execve). This function
894 is currently a GNU extension.
896 * On Linux, the close_range function has been added. It allows efficiently
897 closing a range of file descriptors on recent kernels (version 5.9).
899 * The function closefrom has been added. It closes all file descriptors
900 greater than or equal to a given integer. This function is a GNU extension,
901 although it is also present in other systems.
903 * The posix_spawn_file_actions_addclosefrom_np function has been added,
904 enabling posix_spawn and posix_spawnp to close all file descriptors greater
905 than or equal to a given integer. This function is a GNU extension,
906 although Solaris also provides a similar function.
908 * When invoked explicitly, the dynamic linker now uses the kernel to
909 execute programs that do not have any dynamic dependency (that is,
910 they are statically linked). This feature is Linux-specific.
912 Deprecated and removed features, and other changes affecting compatibility:
914 * The function pthread_mutex_consistent_np has been deprecated; programs
915 should use the equivalent standard function pthread_mutex_consistent
918 * The function pthread_mutexattr_getrobust_np has been deprecated;
919 programs should use the equivalent standard function
920 pthread_mutexattr_getrobust instead.
922 * The function pthread_mutexattr_setrobust_np has been deprecated;
923 programs should use the equivalent standard function
924 pthread_mutexattr_setrobust instead.
926 * The function pthread_yield has been deprecated; programs should use
927 the equivalent standard function sched_yield instead.
929 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
931 * Various rarely-used functions declared in <resolv.h> and
932 <arpa/nameser.h> have been deprecated. Applications are encouraged to
933 use dedicated DNS processing libraries if applicable. For <resolv.h>,
934 this affects the functions dn_count_labels, fp_nquery, fp_query,
935 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
936 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
937 p_type, putlong, putshort, res_hostalias, res_isourserver,
938 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
939 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
940 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
941 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
943 * Various symbols previously defined in libresolv have been moved to libc
944 in order to prepare for libresolv moving entirely into libc (see earlier
945 entry for merging libraries into libc). The symbols __dn_comp,
946 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
947 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
948 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
949 __res_search, __res_send formerly in libresolv have been renamed and no
950 longer have a __ prefix. They are now available in libc.
952 * The pthread cancellation handler is now installed with SA_RESTART and
953 pthread_cancel will always send the internal SIGCANCEL on a cancellation
954 request. It should not be visible to applications since the cancellation
955 handler should either act upon cancellation (if asynchronous cancellation
956 is enabled) or ignore the cancellation internal signal. However there are
957 buggy kernel interfaces (for instance some CIFS versions) that could still
958 see a spurious EINTR error when cancellation interrupts a blocking syscall.
960 * Previously, glibc installed its various shared objects under versioned
961 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
962 were provided as symbolic links. Starting with glibc 2.34, the shared
963 objects are installed under their ABI sonames directly, without
964 symbolic links. This increases compatibility with distribution
965 package managers that delete removed files late during the package
966 upgrade or downgrade process.
968 * The symbols mallwatch and tr_break are now deprecated and no longer used in
969 mtrace. Similar functionality can be achieved by using conditional
970 breakpoints within mtrace functions from within gdb.
972 * The __morecore and __after_morecore_hook malloc hooks and the default
973 implementation __default_morecore have been removed from the API. Existing
974 applications will continue to link against these symbols but the interfaces
975 no longer have any effect on malloc.
977 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
978 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
979 disabled by default in the main C library. Users looking to use these
980 features now need to preload a new debugging DSO libc_malloc_debug.so to get
981 this functionality back.
983 * The deprecated functions malloc_get_state and malloc_set_state have been
984 moved from the core C library into libc_malloc_debug.so. Legacy applications
985 that still use these functions will now need to preload libc_malloc_debug.so
986 in their environment using the LD_PRELOAD environment variable.
988 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
989 __memalign_hook and __free_hook are now removed from the API. Compatibility
990 symbols are present to support legacy programs but new applications can no
991 longer link to these symbols. These hooks no longer have any effect on glibc
992 functionality. The malloc debugging DSO libc_malloc_debug.so currently
993 supports hooks and can be preloaded to get this functionality back for older
994 programs. However this is a transitional measure and may be removed in a
995 future release of the GNU C Library. Users may port away from these hooks by
996 writing and preloading their own malloc interposition library.
998 Changes to build and runtime requirements:
1000 * On Linux, the shm_open, sem_open, and related functions now expect the
1001 file shared memory file system to be mounted at /dev/shm. These functions
1002 no longer search among the system's mount points for a suitable
1003 replacement if /dev/shm is not available.
1005 Security related changes:
1007 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
1008 a request for netgroup lookup, may crash due to a double-free,
1009 potentially resulting in degraded service or Denial of Service on the
1010 local system. Reported by Chris Schanzle.
1012 CVE-2021-33574: The mq_notify function has a potential use-after-free
1013 issue when using a notification type of SIGEV_THREAD and a thread
1014 attribute with a non-default affinity mask.
1016 CVE-2021-35942: The wordexp function may overflow the positional
1017 parameter number when processing the expansion resulting in a crash.
1018 Reported by Philippe Antoine.
1020 The following bugs are resolved with this release:
1022 [4737] libc: fork is not async-signal-safe
1023 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1024 [10353] libc: Methods for deleting all file descriptors greater than
1025 given integer (closefrom)
1026 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1027 name containing multi-byte character(s)
1028 [14469] math: Inaccurate j0f function
1029 [14470] math: Inaccurate j1f function
1030 [14471] math: Inaccurate y0f function
1031 [14472] math: Inaccurate y1f function
1032 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1034 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1035 crashes if it fails dlsym() twice
1036 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1037 [16063] nptl: Provide a pthread_once variant in libc directly
1038 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1039 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1040 [17183] manual: description of ENTRY struct in <search.h> in glibc
1042 [18435] nptl: pthread_once hangs when init routine throws an exception
1043 [18524] nptl: Missing calloc error checking in
1044 __cxa_thread_atexit_impl
1045 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1046 pthread_create and dlopen
1047 [19366] nptl: returning from a thread should disable cancellation
1048 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1049 when non-root user changes priority
1050 [20802] dynamic-link: getauxval NULL pointer dereference after static
1052 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1053 [22057] malloc: malloc_usable_size is broken with mcheck
1054 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1056 [23323] libc: [RFE] CSU startup hardening.
1057 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1059 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1060 $PLATFORM, $ORIGIN) crashes
1061 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1062 [23554] nptl: pthread_getattr_np reports wrong stack size with
1064 [24106] libc: Bash interpreter in ldd script is taken from host
1065 [24773] dynamic-link: dlerror in an secondary namespace does not use
1066 the right free implementation
1067 [25036] localedata: Update collation order for Swedish
1068 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1069 shm_open to pick wrong directory
1070 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1071 crash in IFUNC resolver due to stack canary (--enable-stack-
1073 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1074 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1075 [27111] dynamic-link: pthread_create and tls access use link_map
1076 objects that may be concurrently freed by dlclose
1077 [27132] malloc: memusagestat is linked to system librt, leading to
1078 undefined symbols on major version upgrade
1079 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1081 [27249] libc: libSegFault.so does not output signal number properly
1082 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1084 [27318] dynamic-link: glibc fails to load binaries when built with
1085 -march=sandybridge: CPU ISA level is lower than required
1086 [27343] nss: initgroups() SIGSEGVs when called on a system without
1087 nsswich.conf (in a chroot)
1088 [27346] dynamic-link: x86: PTWRITE feature check is missing
1089 [27389] network: NSS chroot hardening causes regressions in chroot
1091 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1092 [27444] libc: sysconf reports unsupported option (-1) for
1093 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1094 [27462] nscd: double-free in nscd (CVE-2021-27645)
1095 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1096 malloc/tst-malloc-thread-fail
1097 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1098 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1100 [27522] glob: glob, glob64 incorrectly marked as __THROW
1101 [27555] dynamic-link: Static tests fail with --enable-stack-
1103 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1104 information for the current directory
1105 [27577] dynamic-link: elf/ld.so --help doesn't work
1106 [27605] libc: tunables can't control xsave/xsavec selection in
1107 dl_runtime_resolve_*
1108 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1109 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1111 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1112 _nss_files_getcanonname_r) from within a dlmopen namespace.
1113 [27648] libc: FAIL: misc/tst-select
1114 [27650] stdio: vfscanf returns too early if a match is longer than
1116 [27651] libc: Performance regression after updating to 2.33
1117 [27655] string: Wrong size calculation in string/test-strnlen.c
1118 [27706] libc: select fails to update timeout on error
1119 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1120 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1121 tries resolving them lazily
1122 [27744] nptl: Support different libpthread/ld.so load orders in
1124 [27749] libc: Data race __run_exit_handlers
1125 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1127 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1128 exceeds maximum object size 2147483647
1129 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1131 [27872] build: Obsolete configure option --enable-stackguard-
1133 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1134 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1135 [27892] libc: powerpc: scv ABI error handling fails to check
1137 [27896] nptl: mq_notify does not handle separately allocated thread
1138 attributes (CVE-2021-33574)
1139 [27901] libc: TEST_STACK_ALIGN doesn't work
1140 [27902] libc: The x86-64 clone wrapper fails to align child stack
1141 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1142 [27939] libc: aarch64: clone does not align the stack
1143 [27968] libc: s390x: clone does not align the stack
1144 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1145 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1146 with n >= 0x80000000
1147 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1148 thread never allocated anything
1149 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1150 [28064] string: x86_64:wcslen implementation list has wcsnlen
1151 [28067] libc: FAIL: posix/tst-spawn5
1152 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1153 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1155 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1156 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1157 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1159 [28091] network: ns_name_skip may return 0 for domain names without
1167 * The dynamic linker accepts the --list-tunables argument which prints
1168 all the supported tunables. This option is disable if glibc is
1169 configured with tunables disabled (--enable-tunables=no).
1171 * The dynamic linker accepts the --argv0 argument and provides opportunity
1172 to change argv[0] string.
1174 * The dynamic linker loads optimized implementations of shared objects
1175 from subdirectories under the glibc-hwcaps directory on the library
1176 search path if the system's capabilities meet the requirements for
1177 that subdirectory. Initially supported subdirectories include
1178 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1179 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1180 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1181 subdirectory names correspond to the vendor-independent x86-64
1182 microarchitecture levels defined in the x86-64 psABI supplement.
1184 * The new --help option of the dynamic linker provides usage and
1185 information and library search path diagnostics.
1187 * The mallinfo2 function is added to report statistics as per mallinfo,
1188 but with larger field widths to accurately report values that are
1189 larger than fit in an integer.
1191 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1193 * Support for the RISC-V ISA running on Linux has been expanded to run on
1194 32-bit hardware. This is supported for the following ISA and ABI pairs:
1200 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1203 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1204 glibc may use additional checks that may have an additional performance
1205 overhead. At present these checks are available only on LLVM 9 and later.
1206 The latest GCC available at this time (10.2) does not support this level of
1209 Deprecated and removed features, and other changes affecting compatibility:
1211 * The mallinfo function is marked deprecated. Callers should call
1214 * When dlopen is used in statically linked programs, alternative library
1215 implementations from HWCAP subdirectories are no longer loaded.
1216 Instead, the default implementation is used.
1218 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1219 removed. To support old binaries, the vtimes function continues to exist
1220 as a compatibility symbol. Applications should use the getrlimit or
1223 * Following a change in the tzdata 2018a release upstream, the zdump
1224 program is now installed in the /usr/bin subdirectory. Previously,
1225 the /usr/sbin subdirectory was used.
1227 * On s390(x), the type float_t is now derived from the macro
1228 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1229 hardcoded to double. This does not affect the ABI of any libraries
1230 that are part of the GNU C Library, but may affect the ABI of other
1231 libraries that use this type in their interfaces. The new definition
1232 improves consistency with compiler behavior in many scenarios.
1234 * A future version of glibc will stop loading shared objects from the
1235 "tls" subdirectories on the library search path, the subdirectory that
1236 corresponds to the AT_PLATFORM system name, and also stop employing
1237 the legacy AT_HWCAP search mechanism. Applications should switch to
1238 the new glibc-hwcaps mechanism instead; if they do not do that, only
1239 the baseline version (directly from the search path directory) will be
1242 Changes to build and runtime requirements:
1244 * On Linux, the system administrator needs to configure /dev/pts with
1245 the intended access modes for pseudo-terminals. glibc no longer
1246 attempts to adjust permissions of terminal devices. The previous glibc
1247 defaults ("tty" group, user read/write and group write) already
1248 corresponded to what most systems used, so that grantpt did not
1249 perform any adjustments.
1251 * On Linux, the posix_openpt and getpt functions no longer attempt to
1252 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1253 (and pseudo-terminals are supported), a devpts file system is mounted
1254 on /dev/pts. Current systems already meet these requirements.
1256 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1258 Security related changes:
1260 CVE-2021-3326: An assertion failure during conversion from the
1261 ISO-20220-JP-3 character set using the iconv function has been fixed.
1262 This assertion was triggered by certain valid inputs in which the
1263 converted output contains a combined sequence of two wide characters
1264 crossing a buffer boundary. Reported by Tavis Ormandy.
1266 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1267 invoked with input containing redundant shift sequences in the IBM1364,
1268 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1270 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1271 when invoked with UCS4 input containing an invalid character.
1273 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1274 invoked with EUC-KR input containing invalid multibyte input sequences.
1276 The following bugs are resolved with this release:
1278 [10635] libc: realpath portability patches
1279 [16124] dynamic-link: ld.so should allow to change argv[0]
1280 [17924] malloc: 'free' should not set errno
1281 [18683] libc: Linux faccessat implementation can incorrectly ignore
1283 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1284 [23091] hurd: missing waitid support
1285 [23249] libc: Epyc and other current AMD CPUs do not select the
1286 "haswell" platform subdirectory
1287 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1289 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1291 [24941] libc: Make grantpt usable after multi-threaded fork in more
1293 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1294 [24973] locale: iconv encounters segmentation fault when converting
1295 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1296 [25399] string: undefined reference to `__warn_memset_zero_len' when
1297 changing gnuc version
1298 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1300 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1302 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1303 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1304 [26100] libc: Race in syslog(3) with regards to tag printing.
1305 [26124] libc: Export <cpu-features.h>
1306 [26130] nscd: Inconsistent nscd cache during pruning
1307 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1308 [26224] locale: iconv hangs when converting some invalid inputs from
1309 several IBM character sets (CVE-2020-27618)
1310 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1311 too much stack space
1312 [26343] manual: invalid documented return type for strerrorname_np(),
1313 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1314 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1316 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1318 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1319 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1321 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1322 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1323 [26555] string: strerrorname_np does not return the documented value
1324 [26592] libc: pointer arithmetic overflows in realpath
1325 [26600] network: Transaction ID collisions cause slow DNS lookups in
1327 [26606] libc: [2.33 Regression] pselect is broken on x32
1328 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1329 [26620] glob: fnmatch with collating symbols results in segmentation
1331 [26625] libc: [2.33 Regression] CET is disabled
1332 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1333 at the end of a memory mapping
1334 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1335 by the caller to the kernel
1336 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1337 [26647] build: [-Werror=array-parameter=] due to different
1338 declarations for __sigsetjmp
1339 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1341 [26649] stdio: printf should handle non-normal x86 long double numbers
1342 gracefully (CVE-2020-29573)
1343 [26686] build: -Warray-parameter instances building with GCC 11
1344 [26687] build: -Warray-bounds instances building with GCC 11
1345 [26690] stdio: Aliasing violation in __vfscanf_internal
1346 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1347 [26726] build: GCC warning calling new_composite_name with an array of
1349 [26736] libc: FAIL: misc/tst-sysvshm-linux
1350 [26737] libc: Random FAIL: rt/tst-shm
1351 [26791] libc: Missing O_CLOEXEC in sysconf.c
1352 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1354 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1356 [26818] string: aarch64: string tests may run ifunc variants that are
1358 [26821] libc: Memory leak test failures on Fedora 33
1359 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1360 FSGSBASE/LM/RDRAND check failure
1361 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1363 [26853] libc: aarch64: Missing unwind information in statically linked
1365 [26923] locale: Assertion failure in iconv when converting invalid
1366 UCS4 (CVE-2020-29562)
1367 [26926] dynamic-link: aarch64: library dependencies are not bti
1369 [26932] libc: sh: Multiple floating point functions defined as stubs
1371 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1373 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1375 [27002] build: libc_freeres_fn build failure with GCC 11
1376 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1377 [27008] dynamic-link: ld.so.cache should have endianness markup
1378 [27042] libc: [alpha] anonymous union in struct stat confuses
1380 [27053] libc: Conformance regression in system(3) (and probably also
1382 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1384 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1385 [27083] libc: Unsafe unbounded alloca in addmntent
1386 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1388 [27130] string: "rep movsb" performance issue
1389 [27150] libc: alpha: wait4() is unavailable in static linking
1390 [27177] dynamic-link:
1391 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1393 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1394 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1395 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1396 related to combining characters (CVE-2021-3326)
1403 * Unicode 13.0.0 Support: Character encoding, character type info, and
1404 transliteration tables are all updated to Unicode 13.0.0, using
1405 generator scripts contributed by Mike FABIAN (Red Hat).
1407 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1409 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1410 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1411 Three ABIs are supported:
1417 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1418 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1420 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1421 DT_DEPAUDIT dynamic section entries of the main executable.
1423 * powerpc64le supports IEEE128 long double libm/libc redirects when
1424 using -mabi=ieeelongdouble to compile C code on supported GCC
1425 toolchains. It is recommended to use GCC 8 or newer when testing
1428 * To help detect buffer overflows and other out-of-bounds accesses
1429 several APIs have been annotated with GCC 'access' attribute. This
1430 should help GCC 10 issue better warnings.
1432 * On Linux, functions pthread_attr_setsigmask_np and
1433 pthread_attr_getsigmask_np have been added. They allow applications
1434 to specify the signal mask of a thread created with pthread_create.
1436 * The GNU C Library now provides the header file <sys/single_threaded.h>
1437 which declares the variable __libc_single_threaded. Applications are
1438 encouraged to use this variable for single-thread optimizations,
1439 instead of weak references to symbols historically defined in
1442 * The functions sigabbrev_np and sigdescr_np have been added. The
1443 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1444 SIGHUP) while sigdescr_np returns a string describing the signal number
1445 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1446 attempt to translate the return description, both functions return
1447 NULL for an invalid signal number.
1449 They should be used instead of sys_siglist or sys_sigabbrev and they
1450 are both thread and async-signal safe. These functions are GNU extensions.
1452 * The functions strerrorname_np and strerrordesc_np have been added. The
1453 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1454 while strerrordesc_np returns a string describing the error number
1455 (e.g "Invalid argument" for EINVAL). Different than strerror,
1456 strerrordesc_np does not attempt to translate the return description, both
1457 functions return NULL for an invalid error number.
1459 They should be used instead of sys_errlist and sys_nerr, both are
1460 thread and async-signal safe. These functions are GNU extensions.
1462 * AArch64 now supports standard branch protection security hardening
1463 in glibc when it is built with a GCC that is configured with
1464 --enable-standard-branch-protection (or if -mbranch-protection=standard
1465 flag is passed when building both GCC target libraries and glibc,
1466 in either case a custom GCC is needed). This includes branch target
1467 identification (BTI) and pointer authentication for return addresses
1468 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1469 extensions respectively for the protection to be effective,
1470 otherwise the used instructions are nops. User code can use PAC-RET
1471 without libc support, but BTI requires a libc that is built with BTI
1472 support, otherwise runtime objects linked into user code will not be
1475 Deprecated and removed features, and other changes affecting compatibility:
1477 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1478 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1479 RPC header files. Backward compatibility for old programs is kept
1480 only for architectures and ABIs that have been added in or before
1481 glibc 2.31. New programs need to use TI-RPC
1482 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1483 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1485 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1486 as shared library for backward compatibility and the NSS modules "nis"
1487 and "nisplus" are not built at all and libnsl's headers aren't
1488 installed. This compatibility is kept only for architectures and ABIs
1489 that have been added in or before version 2.28. Replacement
1490 implementations based on TI-RPC, which additionally support IPv6, are
1491 available from <https://github.com/thkukuk/>. This change does not
1492 affect the "compat" NSS module, which does not depend on libnsl
1493 since 2.27 and thus can be used without NIS.
1495 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1496 removed. To support old binaries, the sysctl function continues to
1497 exist as a compatibility symbol (on those architectures which had it),
1498 but always fails with ENOSYS. This reflects the removal of the system
1499 call from all architectures, starting with Linux 5.5.
1501 * The sstk function is no longer available to newly linked binaries.
1502 Its implementation always returned with a failure, and the function
1503 was not declared in any header file.
1505 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1506 sigrelse, sigignore and sigset, and the sigmask macro have been
1507 deprecated. Applications should use the sigsuspend, sigprocmask and
1508 sigaction functions instead.
1510 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1511 already supported this format for almost 20 years.
1513 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1514 are no longer available to newly linked binaries, and their declarations
1515 have been removed from <string.h>. They are exported solely as
1516 compatibility symbols to support old binaries. All programs should use
1519 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1520 are no longer available to newly linked binaries, and their declarations
1521 have been removed from <stdio.h>. They are exported solely as
1522 compatibility symbols to support old binaries. All programs should use
1523 strerror or strerror_r instead.
1525 * Both strerror and strerror_l now share the same internal buffer in the
1526 calling thread, meaning that the returned string pointer may be invalided
1527 or contents might be overwritten on subsequent calls in the same thread or
1528 if the thread is terminated. It makes strerror MT-safe.
1530 * Using weak references to libpthread functions such as pthread_create
1531 or pthread_key_create to detect the singled-threaded nature of a
1532 program is an obsolescent feature. Future versions of glibc will
1533 define pthread_create within libc.so.6 itself, so such checks will
1534 always flag the program as multi-threaded. Applications should check
1535 the __libc_single_threaded variable declared in
1536 <sys/single_threaded.h> instead.
1538 * The "files" NSS module no longer supports the "key" database (used for
1539 secure RPC). The contents of the /etc/publickey file will be ignored,
1540 regardless of the settings in /etc/nsswitch.conf. (This method of
1541 storing RPC keys only supported the obsolete and insecure AUTH_DES
1542 flavor of secure RPC.)
1544 * The __morecore and __after_morecore_hook malloc hooks and the default
1545 implementation __default_morecore have been deprecated. Applications
1546 should use malloc interposition to change malloc behavior, and mmap to
1547 allocate anonymous memory. A future version of glibc may require that
1548 applications which use the malloc hooks must preload a special shared
1549 object, to enable the hooks.
1551 * The hesiod NSS module has been deprecated and will be removed in a
1552 future version of glibc. System administrators are encouraged to
1553 switch to other approaches for networked account databases, such as
1556 Changes to build and runtime requirements:
1558 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1559 long double redirects.
1561 Security related changes:
1563 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1564 invoked with the -c option and when processing invalid multi-byte input
1565 sequences. Reported by Jan Engelhardt.
1567 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1568 corruption when they were passed a pseudo-zero argument. Reported by Guido
1569 Vranken / ForAllSecure Mayhem.
1571 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1572 expanding ~user has been fixed.
1574 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1575 memmove functions has been fixed. Discovered by Jason Royes and Samual
1576 Dytrych of the Cisco Security Assessment and Penetration Team (See
1579 The following bugs are resolved with this release:
1581 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1582 [10441] manual: Backtraces code example lacks error checking
1583 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1584 timer_sigev_thread dangerous
1585 [14231] stdio: stdio-common tests memory requirements
1586 [14578] libc: /proc-based emulation for lchmod, fchmodat
1587 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1588 filtee has constructor
1589 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1590 sequences (CVE-2016-10228)
1591 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1592 character entities for infinity & pi
1593 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1594 segfaults in applications
1595 [20543] libc: Please move from .gnu.linkonce to comdat
1596 [22489] network: gcc warns about implicit conversion in
1597 ICMP6_FILTER_SETPASS with -Wsign-conversion
1598 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1599 [23294] math: Complex _FloatN functions are redirected to the wrong
1600 function with -mlong-double-64
1601 [23296] libc: Data race in setting function descriptor during lazy
1603 [23668] dynamic-link: ldconfig: Default to the new format for
1605 [23819] hurd: hurd: Add C11 thread support
1606 [23990] build: test-container error out on failure to exec child.
1607 [23991] build: shell-container typo in run_command_array
1608 [24638] manual: Error in example of parsing a template string
1609 [24654] manual: Wrong declaration of wcschr in libc manual
1610 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1612 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1613 dynamically loaded dsos
1614 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1615 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1617 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1618 restore EAX, ECX and EDX
1619 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1620 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1621 [25420] network: Race condition in resolv_conf.c can result in caching
1622 stale configuration forever
1623 [25487] math: sinl() stack corruption from crafted input
1625 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1627 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1628 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1630 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1631 on 32 bit and old kernel
1632 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1633 [25639] localedata: Some names of days and months wrongly spelt in
1635 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1636 amount of sigset_t bytes
1637 [25691] stdio: printf: memory leak when printing long multibyte
1639 [25715] libc: system() returns wrong errors when posix_spawn fails
1640 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1641 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1642 state for conversions that produce two Unicode code points
1643 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1644 for linux x86_64 leads to livelock
1645 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1646 test failures, invalid instruction in ld.so
1647 [25790] glob: Typo in tst-fnmatch.input
1648 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1650 [25819] localedata: Update locale data to Unicode 13.0.0
1651 [25824] libc: Abnormal function of strnlen in aarch64
1652 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1653 [25896] libc: Incorrect prctl
1654 [25902] libc: Bad LOADARGS_N
1655 [25905] dynamic-link: VSX registers are corrupted during PLT
1656 resolution when glibc is built with --disable-multi-arch and --with-
1658 [25933] string: Off by one error in __strncmp_avx2 when
1659 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1661 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1662 exiting detached thread
1663 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1665 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1667 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1668 [26073] math: getpayload() has wrong return value
1669 [26076] dynamic-link: dlmopen crashes after failing to load
1670 dependencies in audit mode
1671 [26120] localedata: column width of of some Korean
1672 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1673 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1674 [26133] libc: Incorrect need_arch_feature_F16C
1675 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1677 [26149] libc: PKU is usable only if OSPKE is set
1678 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1680 [26208] libc: Incorrect bit_cpu_CLFSH
1681 [26210] network: Incorrect use of hidden symbols for global sunrpc
1683 [26211] stdio: printf integer overflow calculating allocation size
1684 [26214] stdio: printf_fp double free
1685 [26215] stdio: printf_fp memory leak
1686 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1687 [26258] nss: nss_compat should not read input files with mmap
1688 [26332] string: Incorrect cache line size load causes memory
1689 corruption in memset
1696 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1697 enable features from the draft ISO C2X standard. Only some features from
1698 this draft standard are supported by the GNU C Library, and as the draft
1699 is under active development, the set of features enabled by this macro is
1700 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1701 by compiling with "gcc -std=gnu2x".
1703 * The <math.h> functions that round their results to a narrower type now
1704 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1705 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1706 Clarification Request 13 to TS 18661-3.
1708 * The function pthread_clockjoin_np has been added, enabling join with a
1709 terminated thread with a specific clock. It allows waiting against
1710 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1712 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1714 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1715 in queries if the trust-ad option is set via the options directive in
1716 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1717 mode, the AD bit, as provided by the name server, is available to
1718 applications which call res_search and related functions. In the default
1719 mode, the AD bit is not set in queries, and it is automatically cleared in
1720 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1721 servers and the network path to them are treated as untrusted.)
1723 Deprecated and removed features, and other changes affecting compatibility:
1725 * The totalorder and totalordermag functions, and the corresponding
1726 functions for other floating-point types, now take pointer arguments to
1727 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1728 passing. This is in accordance with the resolution of Clarification
1729 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1730 floating-point arguments directly will continue to work.
1732 * The obsolete function stime is no longer available to newly linked
1733 binaries, and its declaration has been removed from <time.h>.
1734 Programs that set the system time should use clock_settime instead.
1736 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1737 in a future version of glibc. In this release, the header still exists
1738 but calling ftime will cause a compiler warning. All programs should use
1739 gettimeofday or clock_gettime instead.
1741 * The gettimeofday function no longer reports information about a
1742 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1743 many years, as it cannot handle the full complexity of the world's
1744 timezones, but hitherto we have supported it on a best-effort basis.
1745 Changes required to support 64-bit time_t on 32-bit architectures have
1746 made this no longer practical.
1748 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1749 should expect to receive a 'struct timezone' whose tz_minuteswest and
1750 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1751 happen on a few Linux-based ports. This will be corrected in a future
1754 All callers should supply a null pointer for the 'tzp' argument to
1755 gettimeofday. For accurate information about the time zone associated
1756 with the current time, use the localtime function.
1758 gettimeofday itself is obsolescent according to POSIX. We have no plans
1759 to remove access to this function, but portable programs should consider
1760 using clock_gettime instead.
1762 * The settimeofday function can still be used to set a system-wide time
1763 zone when the operating system supports it. This is because the Linux
1764 kernel reused the API, on some architectures, to describe a system-wide
1765 time-zone-like offset between the software clock maintained by the kernel,
1766 and the "RTC" clock that keeps time when the system is shut down.
1768 However, to reduce the odds of this offset being set by accident,
1769 settimeofday can no longer be used to set the time and the offset
1770 simultaneously. If both of its two arguments are non-null, the call
1771 will fail (setting errno to EINVAL).
1773 Callers attempting to set this offset should also be prepared for the call
1774 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1775 some Linux architectures. The Linux kernel maintainers are discussing a
1776 more principled replacement for the reused API. After a replacement
1777 becomes available, we will change settimeofday to fail with ENOSYS on all
1778 platforms when its 'tzp' argument is not a null pointer.
1780 settimeofday itself is obsolescent according to POSIX. Programs that set
1781 the system time should use clock_settime and/or the adjtime family of
1782 functions instead. We may cease to make settimeofday available to newly
1783 linked binaries after there is a replacement for Linux's time-zone-like
1786 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1787 the optional CAS instruction is implemented (for instance, LEON processors
1788 are still supported, but SuperSPARC processors are not).
1790 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1793 * If a lazy binding failure happens during dlopen, during the execution of
1794 an ELF constructor, the process is now terminated. Previously, the
1795 dynamic loader would return NULL from dlopen, with the lazy binding error
1796 captured in a dlerror message. In general, this is unsafe because
1797 resetting the stack in an arbitrary function call is not possible.
1799 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1800 executable stack unless explicitly configured at build time to require
1801 minimum kernel version 4.8 or newer. This is because executing
1802 floating-point branches on a non-executable stack on Linux kernels prior to
1803 4.8 can lead to application crashes for some MIPS configurations. While
1804 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1805 expected to enable non-executable stack by default with PT_GNU_STACK by
1806 default and is thus likely to trigger a crash on older kernels.
1808 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1809 non-executable stack while dropping support for older kernels.
1811 * System call wrappers for time system calls now use the new time64 system
1812 calls when available. On 32-bit targets, these wrappers attempt to call
1813 the new system calls first and fall back to the older 32-bit time system
1814 calls if they are not present. This may cause issues in environments
1815 that cannot handle unsupported system calls gracefully by returning
1816 -ENOSYS. Seccomp sandboxes are affected by this issue.
1818 Changes to build and runtime requirements:
1820 * It is no longer necessary to have recent Linux kernel headers to build
1821 working (non-stub) system call wrappers on all architectures except 64-bit
1822 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1824 * The ChangeLog file is no longer present in the toplevel directory of the
1825 source tree. ChangeLog files are located in the ChangeLog.old directory as
1826 ChangeLog.N where the highest N has the latest entries.
1828 Security related changes:
1830 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1831 out-of-bounds write when executed in a signal frame context.
1833 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1834 environment variable during program execution after a security
1835 transition, allowing local attackers to restrict the possible mapping
1836 addresses for loaded libraries and thus bypass ASLR for a setuid
1837 program. Reported by Marcin Kościelnicki.
1839 The following bugs are resolved with this release:
1841 [12031] localedata: iconv -t ascii//translit with Greek characters
1842 [15813] libc: Multiple issues in __gen_tempname
1843 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1844 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1845 [19767] libc: vdso is not used with static linking
1846 [19903] hurd: Shared mappings not being inherited by children processes
1847 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1848 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1850 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1851 Symbols-A/B Unicode blocks
1852 [23518] libc: Eliminate __libc_utmp_jump_table
1853 [24026] malloc: malloc_info() returns wrong numbers
1854 [24054] localedata: Many locales are missing date_fmt
1855 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1856 [24304] dynamic-link: Lazy binding failure during ELF
1857 constructors/destructors is not fatal
1858 [24376] libc: RISC-V symbol size confusion with _start
1859 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1861 [24824] libc: test-in-container does not install charmap files compatible
1863 [24844] regex: regex bad pointer / leakage if malloc fails
1864 [24867] malloc: Unintended malloc_info formatting changes
1865 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1866 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1867 [24882] libc: login: pututline uses potentially outdated cache
1868 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1869 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1871 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1873 [24930] dynamic-link: dlopen of PIE executable can result in
1874 _dl_allocate_tls_init assertion failure
1875 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1876 (stringop-overflow error)
1877 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1878 functions other can lead to crashes
1879 [24967] libc: jemalloc static linking causes runtime failure
1880 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1882 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1883 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1884 [25097] libc: new -Warray-bounds with GCC 10
1885 [25112] dynamic-link: dlopen must not make new objects accessible when it
1886 still can fail with an error
1887 [25139] localedata: Please add the new mnw_MM locale
1888 [25149] regex: Array bounds violation in proceed_next_node
1889 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1890 initialized correctly
1891 [25189] libc: glibc's __glibc_has_include causes issues with clang
1893 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1894 value to an unsigned
1895 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1896 binaries (CVE-2019-19126)
1897 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1899 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1901 [25232] string: <string.h> does not enable const correctness for strchr et
1903 [25233] localedata: Consider "." as the thousands separator for sl_SI
1905 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1906 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1907 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1909 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1910 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1912 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1913 (dl_initfirst) link map pointer
1914 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1915 [25423] libc: Array overflow in backtrace on powerpc
1916 [25425] network: Missing call to __resolv_context_put in
1917 getaddrinfo.c:gethosts
1924 * Unicode 12.1.0 Support: Character encoding, character type info, and
1925 transliteration tables are all updated to Unicode 12.1.0, using
1926 generator scripts contributed by Mike FABIAN (Red Hat).
1928 * The dynamic linker accepts the --preload argument to preload shared
1929 objects, in addition to the LD_PRELOAD environment variable.
1931 * The twalk_r function has been added. It is similar to the existing
1932 twalk function, but it passes an additional caller-supplied argument
1933 to the callback function.
1935 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1937 * Minguo (Republic of China) calendar support has been added as an
1938 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1941 * The entry for the new Japanese era has been added for ja_JP locale.
1943 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1944 pvalloc, memalign, and posix_memalign fail now with total object size
1945 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1946 pointer subtraction within the allocated object, where results might
1947 overflow the ptrdiff_t type.
1949 * The dynamic linker no longer refuses to load objects which reference
1950 versioned symbols whose implementation has moved to a different soname
1951 since the object has been linked. The old error message, symbol
1952 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1953 link time reference, is gone.
1955 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1956 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1957 functions. These behave similarly to their "timed" equivalents, but also
1958 accept a clockid_t parameter to determine which clock their timeout should
1959 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1960 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1961 time of the wait (unlike with pthread_condattr_setclock, which requires
1962 the clock choice at initialization time).
1964 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1965 work, new resolvers can use a second argument which can be extended in
1966 the future, currently it contains the AT_HWCAP2 value.
1968 Deprecated and removed features, and other changes affecting compatibility:
1970 * The copy_file_range function fails with ENOSYS if the kernel does not
1971 support the system call of the same name. Previously, user space
1972 emulation was performed, but its behavior did not match the kernel
1973 behavior, which was deemed too confusing. Applications which use the
1974 copy_file_range function can no longer rely on glibc to provide a fallback
1975 on kernels that do not support the copy_file_range system call, and if
1976 this function returns ENOSYS, they will need to use their own fallback.
1977 Support for copy_file_range for most architectures was added in version
1978 4.5 of the mainline Linux kernel.
1980 * The functions clock_gettime, clock_getres, clock_settime,
1981 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1982 for new applications (on architectures which had them). Instead, the
1983 definitions in libc will be used automatically, which have been available
1986 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1987 and <sys/stropts.h> have been removed.
1989 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1990 resolver flag (deprecated in glibc 2.25) have been removed.
1992 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1993 resolver have been removed from <resolv.h>.
1995 * With --enable-bind-now, installed programs are now linked with the
1998 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1999 configurations) has been removed, following the deprecation of this
2000 subarchitecture in version 8 of GCC, and its removal in version 9.
2002 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
2003 header have been removed.
2005 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
2006 deprecated and will be removed from a future version of glibc.
2007 Application should directly access /proc instead. For obtaining random
2008 bits, the getentropy function can be used.
2010 Changes to build and runtime requirements:
2012 * GCC 6.2 or later is required to build the GNU C Library.
2014 Older GCC versions and non-GNU compilers are still supported when
2015 compiling programs that use the GNU C Library.
2017 Security related changes:
2019 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2020 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2021 has undefined behavior. On x32, the size_t argument may be passed
2022 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2023 32 bits. When it happened with the sign bit of RDX register set,
2024 memcmp gave the wrong result since it treated the size argument as
2025 zero. Reported by H.J. Lu.
2027 CVE-2019-9169: Attempted case-insensitive regular-expression match
2028 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2029 over-read. Reported by Hongxu Chen.
2031 The following bugs are resolved with this release:
2033 [2872] locale: Transliteration Cyrillic -> ASCII fails
2034 [6399] libc: gettid() should have a wrapper
2035 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2036 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2037 [17396] localedata: globbing for locale by [[.collating-element.]]
2038 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2039 [18465] malloc: memusagestat is built using system C library
2040 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2041 invalid input drops valid char
2042 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2043 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2044 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2045 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2046 [23352] malloc: __malloc_check_init still defined in public header
2048 [23403] nptl: Wrong alignment of TLS variables
2049 [23501] libc: nftw() doesn't return dangling symlink's inode
2050 [23733] malloc: Check the count before calling tcache_get()
2051 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2053 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2054 [23844] nptl: pthread_rwlock_trywrlock results in hang
2055 [23983] argparse: Missing compat versions of argp_failure and argp_error
2056 for long double = double
2057 [23984] libc: Missing compat versions of err.h and error.h functions for
2058 long double = double
2059 [23996] localedata: Dutch salutations
2060 [24040] libc: riscv64: unterminated call chain in __thread_start
2061 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2063 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2064 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2066 [24114] regex: regexec buffer read overrun in "grep -i
2067 '\(\(\)*.\)*\(\)\(\)\1'"
2068 [24122] libc: Segfaults if 0 returned from la_version
2069 [24153] stdio: Some input functions do not react to stdin assignment
2070 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2071 RDX is set) (CVE-2019-7309)
2072 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2073 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2074 not the default "nor"
2075 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2076 false positives, change to modern flexible array
2077 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2078 instructions while maintaining the robust mutex list due to missing
2080 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2081 unnecessary librt dependencies
2082 [24200] localedata: Revert first_weekday removal in en_IE locale
2083 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2084 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2085 [24216] malloc: Check for large bin list corruption when inserting
2087 [24228] stdio: old x86 applications that use legacy libio crash on exit
2088 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2090 [24293] localedata: Missing Minguo calendar support for TW locales
2091 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2092 tt_RU (Tatar) locale
2093 [24307] localedata: Update locale data to Unicode 12.0.0
2094 [24323] dynamic-link: dlopen should not be able open PIE objects
2095 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2096 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2097 tt_RU (Tatar) locale
2098 [24370] localedata: Add lang_name for tt_RU locale
2099 [24372] locale: Binary locale files are not architecture independent
2100 [24394] time: strptime %Ey mis-parses final year of era
2101 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2103 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2105 [24531] malloc: Malloc tunables give tcache assertion failures
2106 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2108 [24535] localedata: Update locale data to Unicode 12.1.0
2109 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2110 kernels and break testing
2111 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2112 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2113 [-Werror=format-overflow=]
2114 [24570] libc: alpha: compat msgctl uses __IPC_64
2115 [24584] locale: Data race in __wcsmbs_clone_conv
2116 [24588] stdio: Remove codecvt vtables from libio
2117 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2119 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2120 [24632] stdio: Old binaries which use freopen with default stdio handles
2122 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2124 [24652] localedata: szl_PL spelling correction
2125 [24695] nss: nss_db: calling getpwent after endpwent crashes
2126 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2127 in /etc/nsswitch.conf
2128 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2129 [24740] libc: getdents64 type confusion
2130 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2131 always implemented in the same library
2132 [24744] libc: Remove copy_file_range emulation
2133 [24757] malloc: memusagestat is linked against system libpthread
2134 [24794] libc: Partial test suite run builds corrupt test-in-container
2142 * The getcpu wrapper function has been added, which returns the currently
2143 used CPU and NUMA node. This function is Linux-specific.
2145 * A new convenience target has been added for distribution maintainers
2146 to build and install all locales as directories with files. The new
2147 target is run by issuing the following command in your build tree:
2148 'make localedata/install-locale-files', with an optional DESTDIR
2149 to set the install root if you wish to install into a non-default
2150 configured location.
2152 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2154 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2155 for _GNU_SOURCE, to match BSD environments.
2157 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2158 indicates that it will abort the transaction prior to entering the kernel
2159 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2160 suspended, and this caused some undefined side-effects issues by aborting
2161 transactions manually. Glibc avoided it by abort transactions manually on
2162 each syscall, but it lead to performance issues on newer kernels where the
2163 HTM state is saved and restore lazily (the state being saved even when the
2164 process actually does not use HTM).
2166 * The functions posix_spawn_file_actions_addchdir_np and
2167 posix_spawn_file_actions_addfchdir_np have been added, enabling
2168 posix_spawn and posix_spawnp to run the new process in a different
2169 directory. These functions are GNU extensions. The function
2170 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2173 * The popen and system do not run atfork handlers anymore (BZ#17490).
2174 Although it is a possible POSIX violation, the POSIX rationale in
2175 pthread_atfork documentation regarding atfork handlers is to handle
2176 inconsistent mutex state after a fork call in a multi-threaded process.
2177 In both popen and system there is no direct access to user-defined mutexes.
2179 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2180 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2182 - C-SKY ABIV2 soft-float little-endian
2183 - C-SKY ABIV2 hard-float little-endian
2185 * strftime's default formatting of a locale's alternative year (%Ey)
2186 has been changed to zero-pad the year to a minimum of two digits,
2187 like "%y". This improves the display of Japanese era years during
2188 the first nine years of a new era, and is expected to be harmless
2189 for all other locales (only Japanese locales regularly have
2190 alternative year numbers less than 10). Zero-padding can be
2191 overridden with the '_' or '-' flags (which are GNU extensions).
2193 * As a GNU extension, the '_' and '-' flags can now be applied to
2194 "%EY" to control how the year number is formatted; they have the
2195 same effect that they would on "%Ey".
2197 Deprecated and removed features, and other changes affecting compatibility:
2199 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2200 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2202 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2203 in <sys/procfs.h>, has been corrected to match the type actually used by
2204 the Linux kernel. This affects the size and layout of that structure on
2205 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2207 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2208 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2209 defined in <sys/procfs.h>, has been corrected to match the type actually
2210 used by the Linux kernel. This affects the size and layout of those
2213 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2214 meant to scan a string and allocate space for it with malloc, is now
2215 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2216 defined. This extension conflicts with C99's use of '%a' to scan a
2217 hexadecimal floating-point number, which is now available to programs
2218 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2220 POSIX.1-2008 includes the feature of allocating a buffer for string input
2221 with malloc, using the modifier letter 'm' instead. Programs using
2222 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2223 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2224 C99 '%a' no longer need to avoid _GNU_SOURCE.
2226 GCC's -Wformat warnings can detect most uses of this extension, as long
2227 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2228 __attribute__ ((format (scanf, ...))).
2230 Changes to build and runtime requirements:
2232 * Python 3.4 or later is required to build the GNU C Library.
2234 * On most architectures, GCC 5 or later is required to build the GNU C
2235 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2237 Older GCC versions and non-GNU compilers are still supported when
2238 compiling programs that use the GNU C Library.
2240 Security related changes:
2242 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2243 denial of service due to resource exhaustion when processing getaddrinfo
2244 calls with crafted host names. Reported by Guido Vranken.
2246 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2247 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2248 happened, accessing the 32-bit size_t value as the full 64-bit register
2249 in the assembly string/memory functions would cause a buffer overflow.
2250 Reported by H.J. Lu.
2252 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2253 addresses with arbitrary trailing characters, potentially leading to data
2254 or command injection issues in applications.
2256 The following bugs are resolved with this release:
2258 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2259 [10496] localedata: 12h time representation in multiple locales faulty
2260 [10797] localedata: it_IT locale numeric does not have a separator for
2262 [11319] libc: dprintf doesn't handle errors properly
2263 [16346] time: mktime: potentially unsafe use of localtime_offset
2264 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2266 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2267 posix_spawn_file_actions_addfchdir_np
2268 [17426] localedata: Indian locales: set the correct date format
2269 [17490] stdio: popen should not invoke atfork handlers
2270 [17783] libc: TIOCSER_TEMT conditions inconsistent
2271 [18040] regex: use-after-free in regexec/get_subexp
2272 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2273 [20018] network: getaddrinfo should reject IP addresses with trailing
2274 characters (CVE-2016-10739)
2275 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2276 [20271] libc: Missing "\n" in __libc_fatal calls
2277 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2278 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2279 pointer argument is non-NULL
2280 [21037] stdio: open_memstream and freopen
2281 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2282 [21716] time: Crash in glibc's mktime in low-memory situations
2283 [22834] stdio: Subprocess forked by popen may crash in Linux when
2284 multithreads call popen
2285 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2286 and pthread_create fails.
2287 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2288 [23125] libc: riscv64: endless loop when throwing an exception from a
2290 [23275] nptl: Race in pthread_mutex_lock while promoting to
2291 PTHREAD_MUTEX_ELISION_NP.
2292 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2294 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2296 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2298 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2299 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2301 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2302 [23521] nss: get_next_alias nss_files file stream leak
2303 [23538] nptl: Hang in pthread_cond_broadcast
2304 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2305 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2306 [23579] libc: Errors misreported in preadv2
2307 [23597] build: support/test-container.c doesn't work with different
2309 [23603] time: mktime signed integer overflow on large timestamps
2310 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2311 [23614] libc: powerpc: missing CFI register information in __mpn_*
2313 [23637] string: Generic strstr/strcasestr fails with huge needles
2314 [23640] libc: no way to easily clear FD_CLOEXEC in
2315 posix_spawn_file_actions_adddup2()
2316 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2318 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2320 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2321 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2322 bits/types/struct_rusage.h
2323 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2325 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2327 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2328 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2329 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2331 [23724] localedata: Albanian date formats are incorrect
2332 [23735] math: libnldbl_nonshared.a references internal libm symbols
2333 [23740] localedata: kl_GL: Month names and date formats need update
2334 [23744] regex: regex refactorings to remove BE, avoid duplication
2335 [23745] time: mktime fix for Gnulib + coreutils
2336 [23758] time: Improve the width of alternate representation for year in
2338 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2339 [23789] time: mktime does not set errno on failure
2340 [23791] localedata: Wrong monetary format for ca_ES locale
2341 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2342 [23794] locale: c16rtomb does not handle surrogate pairs
2343 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2344 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2345 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2346 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2347 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2348 [23862] libc: [sh] missing kernel-features.h undefines
2349 [23864] libc: [riscv] missing kernel-features.h undefines
2350 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2351 [23907] malloc: Incorrect double-free malloc tcache check disregards
2353 [23913] libc: off-by-one in function maybe_script_execute in
2354 sysdeps/posix/spawni.c
2355 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2356 [23923] locale: Add --no-hard-links option to localedef
2357 [23927] network: Linux if_nametoindex() does not close descriptor
2359 [23961] math: powf can overflow to inf without setting errno in non-
2360 nearest rounding mode
2361 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2362 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2363 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2364 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2365 [24011] localedata: Fixed small type in comment for locale bs_BA
2366 [24018] libc: gettext() may return NULL
2367 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2368 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2369 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2371 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2372 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2374 [24046] localedata: en_US locale doesn't define date_fmt
2375 [24063] manual: @var{errno} should be @code{errno}
2376 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2377 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2379 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2381 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2383 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2385 [24112] network: Do not send DNS queries for non-host names (where all
2386 answers will be rejected)
2387 [24130] libc: alpha __remqu corrupts $f3 register
2394 * The localization data for ISO 14651 is updated to match the 2016
2395 Edition 4 release of the standard, this matches data provided by
2396 Unicode 9.0.0. This update introduces significant improvements to the
2397 collation of Unicode characters. This release deviates slightly from
2398 the standard in that the collation element ordering for lowercase and
2399 uppercase LATIN script characters is adjusted to ensure that regular
2400 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2401 is not matched by [a-z]. With the update many locales have been
2402 updated to take advantage of the new collation information. The new
2403 collation information has increased the size of the compiled locale
2404 archive or binary locales.
2406 * The GNU C Library can now be compiled with support for Intel CET, AKA
2407 Intel Control-flow Enforcement Technology. When the library is built
2408 with --enable-cet, the resulting glibc is protected with indirect
2409 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2410 compatible with all existing executables and shared libraries. This
2411 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2412 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2413 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2414 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2415 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2416 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2419 * The GNU C Library now has correct support for ABSOLUTE symbols
2420 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2421 relocated incorrectly or in some cases discarded. The GNU linker can
2422 make use of the newer semantics, but it must communicate it to the
2423 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2424 field) to indicate such support is required.
2426 * Unicode 11.0.0 Support: Character encoding, character type info, and
2427 transliteration tables are all updated to Unicode 11.0.0, using
2428 generator scripts contributed by Mike FABIAN (Red Hat).
2430 * <math.h> functions that round their results to a narrower type are added
2431 from TS 18661-1:2014 and TS 18661-3:2015:
2433 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2434 fMxaddfNx functions.
2436 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2437 fMxsubfNx functions.
2439 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2440 fMxmulfNx functions.
2442 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2443 fMxdivfNx functions.
2445 * Two grammatical forms of month names are now supported for the following
2446 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2447 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2448 support two grammatical forms in abbreviated month names: Catalan, Greek,
2451 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2452 include the support for two grammatical forms of month names.
2454 * Building and running on GNU/Hurd systems now works without out-of-tree
2457 * The renameat2 function has been added, a variant of the renameat function
2458 which has a flags argument. If the flags are zero, the renameat2 function
2459 acts like renameat. If the flag is not zero and there is no kernel
2460 support for renameat2, the function will fail with an errno value of
2461 EINVAL. This is different from the existing gnulib function renameatu,
2462 which performs a plain rename operation in case of a RENAME_NOREPLACE
2463 flags and a non-existing destination (and therefore has a race condition
2464 that can clobber the destination inadvertently).
2466 * The statx function has been added, a variant of the fstatat64
2467 function with an additional flags argument. If there is no direct
2468 kernel support for statx, glibc provides basic stat support based on
2469 the fstatat64 function.
2471 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2472 library if installed. libidn2 version 2.0.5 or later is recommended. If
2473 libidn2 is not available, internationalized domain names are not encoded
2474 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2475 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2476 with an encoding error.) Flags which used to change the IDN encoding and
2477 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2478 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2479 deprecated. They no longer have any effect.
2481 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2482 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2483 range of ELF gABI expressions including such constructs as
2484 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2485 have been further restricted, and where in the past a dynamic string
2486 token sequence may have been interpreted as a literal string it will
2487 now cause a load failure. These load failures were always considered
2488 unspecified behaviour from the perspective of the dynamic loader, and
2489 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2490 results in a load failure now.
2492 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2493 implementation includes all the standard functions provided by
2496 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2497 thrd_detach, thrd_exit, and thrd_join for thread management.
2499 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2500 mtx_destroy for mutual exclusion.
2502 - call_once for function call synchronization.
2504 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2505 cnd_wait for conditional variables.
2507 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2509 Application developers must link against libpthread to use ISO C threads.
2511 Deprecated and removed features, and other changes affecting compatibility:
2513 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2514 installed. Software that was using either header should be updated to
2515 use standard <stdio.h> interfaces instead.
2517 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2518 This was never required by the C standard, and the macros just expanded
2519 to call alternative names for the same functions. If you hoped getc and
2520 putc would provide performance improvements over fgetc and fputc, instead
2521 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2522 necessary, flockfile and funlockfile.
2524 * All stdio functions now treat end-of-file as a sticky condition. If you
2525 read from a file until EOF, and then the file is enlarged by another
2526 process, you must call clearerr or another function with the same effect
2527 (e.g. fseek, rewind) before you can read the additional data. This
2528 corrects a longstanding C99 conformance bug. It is most likely to affect
2529 programs that use stdio to read interactive input from a terminal.
2532 * The macros 'major', 'minor', and 'makedev' are now only available from
2533 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2534 headers that happen to include <sys/types.h>. These macros are rarely
2535 used, not part of POSIX nor XSI, and their names frequently collide with
2536 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2537 further explanation.
2539 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2540 these macros should first include <sys/types.h>, and then include
2541 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2543 * The tilegx*-*-linux-gnu configurations are no longer supported.
2545 * The obsolete function ustat is no longer available to newly linked
2546 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2547 function has been deprecated in favor of fstatfs and statfs.
2549 * The obsolete function nfsservctl is no longer available to newly linked
2550 binaries. This function was specific to systems using the Linux kernel
2551 and could not usefully be used with the GNU C Library on systems with
2552 version 3.1 or later of the Linux kernel.
2554 * The obsolete function name llseek is no longer available to newly linked
2555 binaries. This function was specific to systems using the Linux kernel
2556 and was not declared in a header. Programs should use the lseek64 name
2557 for this function instead.
2559 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2560 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2561 previously selected by them is now always enabled.
2563 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2564 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2565 restriction (rejecting '_' in host names, among other things) has been
2566 removed, for increased compatibility with non-IDN name resolution.
2568 * The fcntl function now have a Long File Support variant named fcntl64. It
2569 is added to fix some Linux Open File Description (OFD) locks usage on non
2570 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2571 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2572 locks act as a cancellation entrypoint.
2574 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2575 ecb_crypt, and des_setparity are no longer available to newly linked
2576 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2577 longer installed. These functions encrypted and decrypted data with the
2578 DES block cipher, which is no longer considered secure. Software that
2579 still uses these functions should switch to a modern cryptography library,
2582 * Reflecting the removal of the encrypt and setkey functions above, the
2583 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2584 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2587 * The obsolete function fcrypt is no longer available to newly linked
2588 binaries. It was just another name for the standard function crypt,
2589 and it has not appeared in any header file in many years.
2591 * We have tentative plans to hand off maintenance of the passphrase-hashing
2592 library, libcrypt, to a separate development project that will, we hope,
2593 keep up better with new passphrase-hashing algorithms. We will continue
2594 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2595 'crypt_r' should not need to change at all; however, distributions will
2596 need to install <crypt.h> and libcrypt from a separate project.
2598 In this release, if the configure option --disable-crypt is used, glibc
2599 will not install <crypt.h> or libcrypt, making room for the separate
2600 project's versions of these files. The plan is to make this the default
2601 behavior in a future release.
2603 Changes to build and runtime requirements:
2605 GNU make 4.0 or later is now required to build glibc.
2607 Security related changes:
2609 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2610 been fixed by removing the glibc-internal IDNA implementation and using
2611 the system-provided libidn2 library instead. Originally reported by Hanno
2612 Böck and Christian Weisgerber.
2614 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2615 architecture could corrupt memory. Reported by Max Horn.
2617 CVE-2018-11236: Very long pathname arguments to realpath function could
2618 result in an integer overflow and buffer overflow. Reported by Alexey
2621 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2622 architecture could write beyond the target buffer, resulting in a buffer
2623 overflow. Reported by Andreas Schwab.
2625 The following bugs are resolved with this release:
2627 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2628 [6889] manual: 'PWD' mentioned but not specified
2629 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2630 when __WORDSIZE != 64
2631 [13762] regex: re_search etc. should return -2 on memory exhaustion
2632 [13888] build: /tmp usage during testing
2633 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2634 [14092] nptl: Support C11 threads
2635 [14095] localedata: Review / update collation data from Unicode / ISO
2637 [14508] libc: -Wformat warnings
2638 [14553] libc: Namespace pollution loff_t in sys/types.h
2639 [14890] libc: Make NT_PRFPREG canonical.
2640 [15105] libc: Extra PLT references with -Os
2641 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2643 [16335] manual: Feature test macro documentation incomplete and out of
2645 [16552] libc: Unify umount implementations in terms of umount2
2646 [17082] libc: htons et al.: statement-expressions prevent use on global
2647 scope with -O1 and higher
2648 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2649 [17438] localedata: pt_BR: wrong d_fmt delimiter
2650 [17662] libc: please implement binding for the new renameat2 syscall
2651 [17721] libc: __restrict defined as /* Ignore */ even in c11
2652 [17979] libc: inconsistency between uchar.h and stdint.h
2653 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2654 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2655 horrible machine code)
2656 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2658 [18471] libc: llseek should be a compat symbol
2659 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2661 [18991] nss: nss_files skips large entry in database
2662 [19239] libc: Including stdlib.h ends up with macros major and minor being
2664 [19463] libc: linknamespace failures when compiled with -Os
2665 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2666 [19527] locale: Normalized charset name not recognized by setlocale
2667 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2668 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2670 [19728] network: out of bounds stack read in libidn function
2671 idna_to_ascii_4i (CVE-2016-6261)
2672 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2673 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2674 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2676 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2677 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2678 [20419] dynamic-link: files with large allocated notes crash in
2680 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2681 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2682 [20980] manual: CFLAGS environment variable replaces vital options
2683 [21163] regex: Assertion failure in pop_fail_stack when executing a
2684 malformed regexp (CVE-2015-8985)
2685 [21234] manual: use of CFLAGS makes glibc detect no optimization
2686 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2687 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2688 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2689 [21508] locale: intl/tst-gettext failure with latest msgfmt
2690 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2691 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2692 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2694 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2696 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2697 [22247] network: Integer overflow in the decode_digit function in
2698 puny_decode.c in libidn (CVE-2017-14062)
2699 [22342] nscd: NSCD not properly caching netgroup
2700 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2701 [22550] localedata: es_ES locale (and other es_* locales): collation
2702 should treat ñ as a primary different character, sync the collation
2703 for Spanish with CLDR
2704 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2705 by gcc configured with --enable-default-pie
2706 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2707 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2708 crossing 2GB threshold (CVE-2017-18269)
2709 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2711 [22735] time: Misleading typo in time.h source comment regarding
2713 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2714 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2715 `__assert_perror_fail ()' to `__assert_fail_base ()'
2716 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2718 [22786] libc: Stack buffer overflow in realpath() if input size is close
2719 to SSIZE_MAX (CVE-2018-11236)
2720 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2721 through an absolute DT_NEEDED path
2722 [22792] build: tcb-offsets.h dependency dropped
2723 [22797] libc: pkey_get() uses non-reserved name of argument
2724 [22807] libc: PTRACE_* constants missing for powerpc
2725 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2726 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2727 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2728 [22848] localedata: ca_ES: update date definitions from CLDR
2729 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2730 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2731 [22896] localedata: Update locale data for an_ES
2732 [22902] math: float128 test failures with GCC 8
2733 [22918] libc: multiple common of `__nss_shadow_database'
2734 [22919] libc: sparc32: backtrace yields infinite backtrace with
2736 [22926] libc: FTBFS on powerpcspe
2737 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2739 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2740 [22947] libc: FAIL: misc/tst-preadvwritev2
2741 [22963] localedata: cs_CZ: Add alternative month names
2742 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2743 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2744 [22998] dynamic-link: execstack tests are disabled when SELinux is
2746 [23005] network: Crash in __res_context_send after memory allocation
2748 [23007] math: strtod cannot handle -nan
2749 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2750 [23036] regex: regex equivalence class regression
2751 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2752 [23069] libc: sigaction broken on riscv64-linux-gnu
2753 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2754 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2755 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2756 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2757 and libc build with -Os)
2758 [23140] localedata: More languages need two forms of month names
2759 [23145] libc: _init/_fini aren't marked as hidden
2760 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2761 [23171] math: C++ iseqsig for long double converts arguments to double
2762 [23178] nscd: sudo will fail when it is run in concurrent with commands
2763 that changes /etc/passwd
2764 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2766 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2767 [23208] localedata: New locale - Lower Sorbian (dsb)
2768 [23233] regex: Memory leak in build_charclass_op function in file
2770 [23236] stdio: Harden function pointers in _IO_str_fields
2771 [23250] nptl: Offset of __private_ss differs from GCC
2772 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2773 -mtune=generic -mfpmath=sse
2774 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2776 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2777 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2779 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2780 [23277] math: nan function should not have const attribute
2781 [23279] math: scanf and strtod wrong for some hex floating-point
2782 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2784 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2785 [23303] build: undefined reference to symbol
2786 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2787 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2789 [23313] stdio: libio vtables validation and standard file object
2791 [23329] libc: The __libc_freeres infrastructure is not properly run across
2793 [23349] libc: Various glibc headers no longer compatible with
2795 [23351] malloc: Remove unused code related to heap dumps and malloc
2797 [23363] stdio: stdio-common/tst-printf.c has non-free license
2798 [23396] regex: Regex equivalence regression in single-byte locales
2799 [23422] localedata: oc_FR: More updates of locale data
2800 [23442] build: New warning with GCC 8
2801 [23448] libc: Out of bounds access in IBM-1390 converter
2802 [23456] libc: Wrong index_cpu_LZCNT
2803 [23458] build: tst-get-cpu-features-static isn't added to tests
2804 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2806 [23467] dynamic-link: x86/CET: A property note parser bug
2813 * The GNU C Library can now be compiled with support for building static
2814 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2815 executables are like static executables but can be loaded at any address
2816 and provide additional security hardening benefits at the cost of some
2817 memory and performance. When the library is built with --enable-static-pie
2818 the resulting libc.a is usable with GCC 8 and above to create static PIE
2819 executables using the GCC option '-static-pie'. This feature is currently
2820 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2821 aarch64 with binutils 2.30 or later.
2823 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2824 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2827 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2829 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2831 * In order to support faster and safer process termination the malloc API
2832 family of functions will no longer print a failure address and stack
2833 backtrace after detecting heap corruption. The goal is to minimize the
2834 amount of work done after corruption is detected and to avoid potential
2835 security issues in continued process execution. Reducing shutdown time
2836 leads to lower overall process restart latency, so there is benefit both
2837 from a security and performance perspective.
2839 * The abort function terminates the process immediately, without flushing
2840 stdio streams. Previous glibc versions used to flush streams, resulting
2841 in deadlocks and further data corruption. This change also affects
2842 process aborts as the result of assertion failures.
2844 * On platforms where long double has the IEEE binary128 format (aarch64,
2845 alpha, mips64, riscv, s390 and sparc), the math library now implements
2846 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2847 These are the same interfaces added in version 2.26 for some platforms where
2848 this format is supported but is not the format of long double.
2850 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2851 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2852 implements interfaces for that type, as defined by ISO/IEC TS
2853 18661-3:2015. These are corresponding interfaces to those supported for
2856 * The math library now implements interfaces for the _Float32, _Float64 and
2857 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2858 corresponding interfaces to those supported for _Float128.
2860 * glibc now implements the memfd_create and mlock2 functions on Linux.
2862 * Support for memory protection keys was added. The <sys/mman.h> header now
2863 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2866 * The copy_file_range function was added.
2868 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2870 * The ldconfig utility now processes `include' directives using the C/POSIX
2871 collation ordering. Previous glibc versions used locale-specific
2872 ordering, the change might break systems that relied on that.
2874 * Support for two grammatical forms of month names has been added.
2875 In a call to strftime, the "%B" and "%b" format specifiers will now
2876 produce the grammatical form required when the month is used as part
2877 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2878 required when the month is named by itself. For instance, in Greek
2879 and in many Slavic and Baltic languages, "%B" will produce the month
2880 in genitive case, and "%OB" will produce the month in nominative case.
2882 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2883 are all valid and will all accept any known form of month
2884 name---standalone or complete, abbreviated or full. In a call to
2885 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2886 the strings used by "%B" and "%b", respectively. New query
2887 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2888 used by "%OB" and "%Ob", respectively.
2890 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2891 define the strings for %OB and %Ob, respectively; these have the
2892 same syntax as "mon" and "abmon". These arrays are optional; if they
2893 are not provided then they have the same content as "mon" and "abmon",
2896 These features are provided for locales which define "alt_mon" and/or
2897 "ab_alt_mon" in their locale source data. This release includes such
2898 alternative month name data for the following languages: Belarusian,
2899 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2901 This feature is currently a GNU extension, but it is expected to
2902 be added to the next revision of POSIX, and it is also already
2903 available on some BSD-derived operating systems.
2905 This feature will cause existing statically compiled applications
2906 to fail to load locales and fall back to the builtin C/POSIX locales.
2907 See notes below for other changes affecting compatibility.
2909 * Support for the RISC-V ISA running on Linux has been added. This port
2910 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2911 for the following ISA and ABI pairs:
2917 Deprecated and removed features, and other changes affecting compatibility:
2919 * Statically compiled applications attempting to load locales compiled for the
2920 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2921 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2922 support for two grammatical forms of the month names, also extends the locale
2923 data binary format. Static applications needing locale support must be
2924 recompiled to match the runtime and data they are deployed with. In some
2925 distributions there is an upgrade window where dynamically linked applications
2926 may use a new library but the old locale data and also fall back to the
2927 builtin C/POSIX locales; restarting the application process is sufficient to
2930 * Support for statically linked applications which call dlopen is deprecated
2931 and will be removed in a future version of glibc. Applications which call
2932 dlopen need to be linked dynamically instead.
2934 * Support for old programs which use internal stdio data structures and
2935 functions is deprecated. This includes programs which use the C++ streams
2936 provided by libstdc++ in GCC 2.95. Programs which use the internal
2937 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2938 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2939 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2940 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2941 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2942 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2943 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2944 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2945 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2946 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2947 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2948 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2949 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2950 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2951 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2952 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2953 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2954 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2955 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2956 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2957 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2958 future version of glibc. Unlike other symbol removals, these old
2959 applications will not be supported using compatibility symbols.
2961 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2962 defined by <sys/ptrace.h>.
2964 * libm no longer supports SVID error handling (calling a user-provided
2965 matherr function on error) or the _LIB_VERSION variable to control error
2966 handling. (SVID error handling and the _LIB_VERSION variable still work
2967 for binaries linked against older versions of the GNU C Library.) The
2968 libieee.a library is no longer provided. math.h no longer defines struct
2969 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2970 TLOSS, PLOSS and HUGE.
2972 * The libm functions pow10, pow10f and pow10l are no longer supported for
2973 new programs. Programs should use the standard names exp10, exp10f and
2974 exp10l for these functions instead.
2976 * The mcontext_t type is no longer the same as struct sigcontext. On
2977 platforms where it was previously the same, this changes the C++ name
2978 mangling for interfaces involving this type.
2980 * The add-ons mechanism for building additional packages at the same time as
2981 glibc has been removed. The --enable-add-ons configure option is now
2984 * The --without-fp configure option is now ignored. Whether hardware
2985 floating-point instructions are used is now configured based on whether
2986 the compiler used at configure time (without any options implied by a
2987 --with-cpu= configure option) uses such instructions.
2989 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2990 the specified string can be parsed as a domain name.
2992 * In the malloc_info output, the <heap> element may contain another <aspace>
2993 element, "subheaps", which contains the number of sub-heaps.
2995 * The libresolv function p_secstodate is no longer supported for new
2998 * The tilepro-*-linux-gnu configuration is no longer supported.
3000 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
3001 and will be removed in a future release. Software that is still using
3002 either header should be updated to use standard <stdio.h> interfaces
3005 libio.h was originally the header for a set of supported GNU extensions,
3006 but they have not been maintained as such in many years, they are now
3007 standing in the way of improvements to stdio, and we don't think there are
3008 any remaining external users. _G_config.h was never intended for public
3009 use, but predates the bits convention.
3011 Changes to build and runtime requirements:
3013 * bison version 2.7 or later is required to generate code in the 'intl'
3016 Security related changes:
3018 CVE-2009-5064: The ldd script would sometimes run the program under
3019 examination directly, without preventing code execution through the
3020 dynamic linker. (The glibc project disputes that this is a security
3021 vulnerability; only trusted binaries must be examined using the ldd
3024 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3025 suffered from a one-byte overflow during ~ operator processing (either
3026 on the stack or the heap, depending on the length of the user name).
3027 Reported by Tim Rühsen.
3029 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3030 would sometimes fail to free memory allocated during ~ operator
3031 processing, leading to a memory leak and, potentially, to a denial
3034 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3035 without GLOB_NOESCAPE, could write past the end of a buffer while
3036 unescaping user names. Reported by Tim Rühsen.
3038 CVE-2017-17426: The malloc function, when called with an object size near
3039 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3040 instead of NULL. This was a regression introduced with the new malloc
3041 thread cache in glibc 2.26. Reported by Iain Buclaw.
3043 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3044 to the allocation of too much memory. (This is not a security bug per se,
3045 it is mentioned here only because of the CVE assignment.) Reported by
3048 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3049 of the number of search path components. (This is not a security
3050 vulnerability per se because no trust boundary is crossed if the fix for
3051 CVE-2017-1000366 has been applied, but it is mentioned here only because
3052 of the CVE assignment.) Reported by Qualys.
3054 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3055 for AT_SECURE or SUID binaries could be used to load libraries from the
3058 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3059 succeeds without returning an absolute path due to unexpected behaviour
3060 of the Linux kernel getcwd syscall. Reported by halfdog.
3062 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3063 an object size near the value of SIZE_MAX, would return a pointer to a
3064 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3066 CVE-2018-6551: The malloc function, when called with an object size near
3067 the value of SIZE_MAX, would return a pointer to a buffer which is too
3068 small, instead of NULL.
3070 The following bugs are resolved with this release:
3072 [866] glob: glob should match dangling symlinks
3073 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3074 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3076 [5997] math: Very slow execution of sinf function
3077 [10580] localedata: hr_HR: updated locale
3078 [10871] locale: 'mon' array should contain both nominative and genitive
3080 [12349] localedata: eu_ES: incorrect thousands separator
3081 [13605] localedata: shn_MM: new Shan locale
3082 [13805] localedata: ru_RU: currency should use ',' as radix point
3083 [13953] localedata: km_KH: locale update
3084 [13994] localedata: mjw_IN: new locale
3085 [14121] build: make writes .mo files in po directory
3086 [14333] libc: Fix the race between atexit() and exit()
3087 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3088 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3090 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3091 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3092 width Latin characters
3093 [15332] localedata: es_CU: locale update
3094 [15436] stdio: Don't close or flush stdio streams on abort
3095 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3097 [16148] localedata: ca_ES: incorrect thousands separator
3098 [16750] dynamic-link: ldd should not try to execute the binaries
3100 [16777] localedata: pl_PL: incorrect thousands separator in locale
3101 [16905] localedata: hanzi: new collation
3102 [17563] localedata: cmn_TW: add hanzi collation
3103 [17750] localedata: wrong collation order of diacritics in most locales
3104 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3106 [17956] build: Build fails on missing definitions from header file
3107 nss/nss.h when Mozilla NSS is used for cryptography
3108 [18203] libc: realpath() does not handle unreachable paths correctly
3109 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3110 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3111 [18822] libc: Internal functions are called via PLT
3112 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3113 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3114 [19574] libc: glibc should support building static PIE binaries
3115 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3117 [19971] glob: glob: Do not skip entries with zero d_ino values
3118 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3119 [20008] localedata: km_KH: convert to translit_neutral
3120 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3121 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3122 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3123 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3124 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3126 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3127 they're set, wrong errors returned by gaih_inet when lookup functions
3129 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3130 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3132 [20952] localedata: yuw_PG: new locale
3133 [21084] localedata: charmaps/IBM858: new codepage
3134 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3135 [21242] libc: assert gives pedantic warning in old gcc versions
3136 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3137 __regcall calling convention
3138 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3139 [21326] libc: C99 functions are not declared for C++11 and later if
3140 _GNU_SOURCE is not predefined by g++
3141 [21457] libc: sys/ucontext.h namespace
3142 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3143 [21660] math: GCC fails to compile a formula with tgmath.h
3144 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3145 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3146 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3147 [21684] math: tgmath.h handling of complex integers
3148 [21685] math: tgmath.h handling of bit-fields
3149 [21686] math: tgmath.h handling of __int128
3150 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3152 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3154 [21750] localedata: column width of characters incompatible with classical
3156 [21754] malloc: malloc: Perform as little work as possible after heap
3157 consistency check failures
3158 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3159 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3160 [21791] string: Unused XXX_chk_XXX functions in libc.a
3161 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3163 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3165 [21845] localedata: Added new Locale bho_NP
3166 [21853] localedata: Fix abday Which looks same as day in zh_SG
3167 [21854] localedata: Added New Locale en_SC
3168 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3169 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3170 _dl_runtime_resolve_avx_slow
3171 [21885] network: getaddrinfo: gethosts does not release resolver context
3172 on memory allocation failure
3173 [21899] libc: XPG4.2 sigaction namespace
3174 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3176 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3178 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3179 errno value, causing getaddrinfo to fail
3180 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3181 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3182 instead of EAI_NODATA
3183 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3184 constant PTRACE_SEIZE_DEVEL
3185 [21930] math: C-only gcc builtins used in <math.h> isinf
3186 [21932] network: Unpaired __resolv_context_get in generic get*_r
3188 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3189 [21944] libc: sigval namespace
3190 [21951] localedata: Update hanzi collation by stroke
3191 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3192 sysdeps/x86_64/fpu/e_expf.S
3193 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3194 allocation in syscall loops)
3195 [21959] localedata: Fix Country name for xh_ZA
3196 [21960] localedata: Fix abmon for bem_ZM
3197 [21966] math: AVX2 mathvec functions use FMA without checking
3198 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3199 [21971] localedata: Added New Locale for mfe_MU
3200 [21972] libc: assert macro requires operator== (int) for its argument type
3201 [21973] math: [sparc] libm missing sqrtl compat symbol
3202 [21974] libc: Remove __bb_init_func and __bb_exit_func
3203 [21982] string: stratcliff.c: error: assuming signed overflow does not
3205 [21986] stdio: __guess_grouping is called incorrectly
3206 [21987] math: [sparc32] wrong bits/long-double.h installed
3207 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3209 [22022] localedata: Missing country_name for mni_IN
3210 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3212 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3214 [22026] locale: iconv_open: heap overflow on gconv_init failure
3215 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3216 [22035] math: [m68k] bits/math-inline.h macro namespace
3217 [22038] localedata: Fix abbreviated weeks and months for Somali
3218 [22044] localedata: Remove redundant data for Limburgish Language
3219 [22050] malloc: Linking with -lmcheck does not hook
3220 __malloc_initialize_hook correctly
3221 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3222 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3223 [22070] localedata: charmaps/UTF-8: wcwidth for
3224 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3225 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3226 Jungseong and Jongseong) should be 0
3227 [22078] nss: nss_files performance issue in multi mode
3228 [22082] math: bits/math-finite.h exp10 condition
3229 [22086] libc: pcprofiledump incorrect cross-endian condition
3230 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3231 [22095] network: Name server address allocation memory leak in resolv.conf
3233 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3235 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3236 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3238 [22111] malloc: malloc: per thread cache is not returned when thread exits
3239 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3240 [22134] libc: [linux] implement fexecve with execveat
3241 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3243 [22145] libc: ttyname() gives up too early in the face of namespaces
3244 [22146] math: C++ build issue with float128 on x86_64
3245 [22153] nptl: nptl: save error code before process termination
3246 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3247 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3248 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3249 [22165] libc: [hppa] Text relocations in libc.so
3250 [22180] libc: destructor registered via __cxa_atexit is called twice
3251 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3252 symlinks") cause "make" segfaults
3253 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3255 [22207] libc: FAIL: stdlib/test-atexit-race
3256 [22225] math: nearbyint arithmetic moved before feholdexcept
3257 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3258 [22235] math: iscanonical in C++ and float128
3259 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3260 the svid compat wrapper
3261 [22244] math: ynf and yn are wrong without the svid compat wrapper
3262 [22273] libc: Improper assert in Linux posix_spawn implementation
3263 [22284] libc: -pg -pie doesn't work
3264 [22292] locale: localedef exits with error 4 when it should be error 1
3265 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3266 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3268 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3269 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3271 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3272 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3273 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3274 [22322] libc: [mips64] wrong bits/long-double.h installed
3275 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3276 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3278 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3279 [22343] malloc: Integer overflow in posix_memalign
3280 [22347] libc: getrandom() returns the number of bytes that were copied to
3281 the buffer even though the comments say "Return 0 on success and -1 on
3283 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3284 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3286 [22370] dynamic-link: Incorrect note padding check
3287 [22375] libc: malloc returns pointer from tcache_get when should return
3288 NULL (CVE-2017-17426)
3289 [22377] math: iseqsig, float128 and C++
3290 [22382] localedata: Error in tpi_PG locale
3291 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3292 inside the ASCII printable range
3293 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3295 [22403] localedata: Slash needs escaping in some locales
3296 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3297 [22409] network: res_hnok does not accept some host names used on the
3299 [22412] network: res_dnok, res_hnok should perform syntax checks
3300 [22413] network: ns_name_pton ignores syntactically invalid trailing
3302 [22415] stdio: setvbuf can lead to invalid free/segfault
3303 [22432] build: Non-deterministic build
3304 [22439] malloc: malloc_info should compute summary statistics for all sub-
3306 [22442] network: if_nametoindex could report index for the wrong
3307 networking interface
3308 [22446] build: aliasing violation calling readlink in handle_request
3309 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3310 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3311 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3312 __nscd_hash/__nss_hash
3313 [22463] network: p_secstodate overflow handling
3314 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3315 [22478] libc: sigwait can fail with EINTR
3316 [22505] libc: ldconfig processes include directive in locale-specific
3318 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3319 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3320 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3321 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3322 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3323 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3324 same as for Croatian
3325 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3326 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3327 [22577] libc: missing newline after "cannot allocate TLS data structures
3329 [22588] manual: manual/conf.texi: missing underscore in front of
3331 [22593] math: nextafter and nexttoward are declared with const attribute
3332 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3333 [22603] string: ia64 memchr overflows internal pointer check
3334 [22605] libc: SH clone does not set the exit code correctly
3335 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3337 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3338 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3339 modified in case of success
3340 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3341 [22615] manual: manual: ambiguous wording about errno value in case of
3343 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3345 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3346 binaries or if /proc is not mounted (CVE-2017-16997)
3347 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3348 [22630] build: $(no-pie-ldflag) is no longer effective
3349 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3350 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3351 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3352 [22637] nptl: guard size is subtracted from thread stack size instead of
3354 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3355 [22657] localedata: hu_HU: Avoid double space in date
3356 [22660] math: fmax, fmin sNaN handling on alpha
3357 [22664] libc: New warning of GCC8
3358 [22665] math: alpha: ceil and floor raise inexact exceptions
3359 [22666] math: alpha: trunc raise inexact exceptions
3360 [22667] libc: makecontext lacks stack alignment on i386
3361 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3362 [22679] libc: getcwd(3) can succeed without returning an absolute path
3364 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3365 elision and tunables
3366 [22687] math: [powerpc-nofpu] complex long double functions spurious
3368 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3369 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3370 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3372 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3373 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3375 [22701] nis: Incomplete removal of libnsl
3376 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3377 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3378 [22715] dynamic-link: FAIL: elf/tst-audit10
3379 [22719] libc: Backtrace tests fail on hppa
3380 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3381 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3382 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3383 before the first call to crypt_r () in crypt/badsalttest.c
3390 * A per-thread cache has been added to malloc. Access to the cache requires
3391 no locks and therefore significantly accelerates the fast path to allocate
3392 and free small amounts of memory. Refilling an empty cache requires locking
3393 the underlying arena. Performance measurements show significant gains in a
3394 wide variety of user workloads. Workloads were captured using a special
3395 instrumented malloc and analyzed with a malloc simulator. Contributed by
3396 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3398 * Unicode 10.0.0 Support: Character encoding, character type info, and
3399 transliteration tables are all updated to Unicode 10.0.0, using
3400 generator scripts contributed by Mike FABIAN (Red Hat).
3401 These updates cause user visible changes, especially the changes in
3402 wcwidth for many emoji characters cause problems when emoji sequences
3403 are rendered with pango, see for example:
3404 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3406 * Collation of Hungarian has been overhauled and is now consistent with "The
3407 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3410 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3412 - The GNU C Library will now detect when /etc/resolv.conf has been
3413 modified and reload the changed configuration. The new resolver option
3414 “no-reload” (RES_NORELOAD) disables this behavior.
3416 - The GNU C Library now supports an arbitrary number of search domains
3417 (configured using the “search” directive in /etc/resolv.conf);
3418 previously, there was a hard limit of six domains. For backward
3419 compatibility, applications that directly modify the ‘_res’ global
3420 object are still limited to six search domains.
3422 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3423 Library will now randomly pick a name server from the configuration as a
3424 starting point. (Previously, the second name server was always used.)
3426 * The tunables feature is now enabled by default. This allows users to tweak
3427 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3429 * New function reallocarray, which resizes an allocated block (like realloc)
3430 to the product of two sizes, with a guaranteed clean failure upon integer
3431 overflow in the multiplication. Originally from OpenBSD, contributed by
3432 Dennis Wölfing and Rüdiger Sonderfeld.
3434 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3435 These are extended versions of preadv and pwritev, respectively, taking an
3436 additional flags argument. The set of supported flags depends on the
3437 running kernel; full support currently requires kernel 4.7 or later.
3439 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3440 create a new session ID for the spawned process. This feature is
3441 scheduled to be added to the next major revision of POSIX; for the time
3442 being, it is available under _GNU_SOURCE.
3444 * errno.h is now safe to use from C-preprocessed assembly language on all
3445 supported operating systems. In this context, it will only define the
3446 Exxxx constants, as preprocessor macros expanding to integer literals.
3448 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3449 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3450 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3451 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3453 To compile programs that use this feature, the compiler must support
3454 128-bit floating point with the type name _Float128 (as defined by TS
3455 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3456 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3457 must be defined to make the new interfaces visible.
3459 The new functions and macros correspond to those present for other
3460 floating-point types (except for a few obsolescent interfaces not
3461 supported for the new type), with F128 or f128 suffixes; for example,
3462 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3463 printf or scanf formats for the new type; the strfromf128 and strtof128
3464 interfaces should be used instead.
3466 Deprecated and removed features, and other changes affecting compatibility:
3468 * The synchronization that pthread_spin_unlock performs has been changed to
3469 now be equivalent to a C11 atomic store with release memory order to the
3470 spin lock's memory location. Previously, several (but not all)
3471 architectures used stronger synchronization (e.g., containing what is
3472 often called a full barrier). This change can improve performance, but
3473 may affect odd fringe uses of spin locks that depend on the previous
3474 behavior (e.g., using spin locks as atomic variables to try to implement
3475 Dekker's mutual exclusion algorithm).
3477 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3480 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3481 will only be built and installed when the GNU C Library is configured with
3482 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3483 as TIRPC or rpcsvc-proto, to be used.
3485 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3486 libnss_compat, are deprecated, and will not be built or installed by
3489 The NIS(+) support library, libnsl, is also deprecated. By default, a
3490 compatibility shared library will be built and installed, but not headers
3491 or development libraries. Only a few NIS-related programs require this
3492 library. (In particular, the GNU C Library has never required programs
3493 that use 'gethostbyname' to be linked with libnsl.)
3495 Replacement implementations based on TIRPC, which additionally support
3496 IPv6, are available from <https://github.com/thkukuk/>. The configure
3497 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3498 name service modules, to be built and installed.
3500 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3501 support is enabled, the configured recursive resolver must support EDNS.
3502 (Responding to EDNS-enabled queries with responses which are not
3503 EDNS-enabled is fine, but FORMERR responses are not.)
3505 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3506 servers have not supported this opcode for a long time.
3508 * The _res_opcodes variable has been removed from libresolv. It had been
3509 exported by accident.
3511 * <string.h> no longer includes inline versions of any string functions,
3512 as this kind of optimization is better done by the compiler. The macros
3513 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3515 * The nonstandard header <xlocale.h> has been removed. Most programs should
3516 use <locale.h> instead. If you have a specific need for the definition of
3517 locale_t with no other declarations, please contact
3518 libc-alpha@sourceware.org and explain.
3520 * The obsolete header <sys/ultrasound.h> has been removed.
3522 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3524 * The obsolete function cfree has been removed. Applications should use
3527 * The stack_t type no longer has the name struct sigaltstack. This changes
3528 the C++ name mangling for interfaces involving this type.
3530 * The ucontext_t type no longer has the name struct ucontext. This changes
3531 the C++ name mangling for interfaces involving this type.
3533 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3534 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3535 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3536 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3537 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3538 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3539 fpregset_t type no longer has the name struct fpu. This changes the C++
3540 name mangling for interfaces involving those types.
3542 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3543 synced with the kernel:
3545 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3546 are not supported on this architecture and have been removed.
3548 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3549 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3550 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3552 Programs that assume the GET/SETREGS ptrace requests are universally
3553 available will now fail to build, instead of malfunctioning at runtime.
3555 Changes to build and runtime requirements:
3557 * Linux kernel 3.2 or later is required at runtime, on all architectures
3558 supported by that kernel. (This is a change from version 2.25 only for
3561 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3563 * On most architectures, GCC 4.9 or later is required to build the GNU C
3564 Library. On powerpc64le, GCC 6.2 or later is required.
3566 Older GCC versions and non-GNU compilers are still supported when
3567 compiling programs that use the GNU C Library. (We do not know exactly
3568 how old, and some GNU extensions to C may be _de facto_ required. If you
3569 are interested in helping us make this statement less vague, please
3570 contact libc-alpha@sourceware.org.)
3572 Security related changes:
3574 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3575 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3577 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3578 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3580 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3581 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3584 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3585 fixed (CVE-2017-12133).
3587 The following bugs are resolved with this release:
3589 [984] network: Respond to changed resolv.conf in gethostbyname
3590 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3591 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3593 [12189] libc: __stack_chk_fail should not attempt a backtrace
3595 [14096] time: Race condition on timezone/tst-timezone.out
3596 [14172] localedata: az_IR: new locale
3597 [14995] build: glibc fails to build if gold is the default linker, even if
3599 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3600 [16637] network: inet_pton function is accepting IPv6 with bad format
3601 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3602 x86 and other generic code
3603 [16875] localedata: ko_KR: fix lang_name
3604 [17225] localedata: ar_SY: localized month names for May and June are
3606 [17297] localedata: da_DK: wrong date_fmt string
3607 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3608 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3609 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3610 [19066] localedata: ar_SA abbreviated day and month names are in English
3611 [19569] network: resolv: Support an arbitrary number of search domains
3612 [19570] network: Implement random DNS server selection in the stub
3614 [19838] locale: localedef fails on PA-RISC
3615 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3616 order of 0D36 and 0D37
3617 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3619 [20098] libc: FAIL: debug/backtrace-tst on hppa
3620 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3622 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3624 [20313] localedata: Update locale data to Unicode 9.0
3625 [20424] manual: Document how to provide a malloc replacement
3626 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3628 [20686] locale: Add el_GR@euro to SUPPORTED.
3629 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3630 failures consistently
3631 [21015] dynamic-link: Document and fix --enable-bind-now
3632 [21016] nptl: pthread_cond support is broken on hppa
3633 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3634 frame-pointer on i386
3635 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3637 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3638 [21088] libc: Build fails with --enable-static-nss
3639 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3640 generic c code is used
3641 [21109] libc: Tunables broken on big-endian
3642 [21112] math: powf has large ulp errors with base close to 1 and exponent
3644 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3646 [21120] malloc: glibc malloc is incompatible with GCC 7
3647 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3649 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3650 (-0.0) when linking with -lieee
3651 [21171] math: log10, log2 and lgamma return incorrect results
3652 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3653 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3654 [21207] localedata: ce_RU: update weekdays from CLDR
3655 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3656 [21217] localedata: Update months from CLDR-31
3657 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3658 [21243] libc: support_delete_temp_file should issue warning for failed
3660 [21244] libc: support resolv_test_start() socket fd close should be
3662 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3663 new posix_spawn implementation
3664 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3665 leads to lower CPU frequency
3666 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3667 [21261] libc: [sparc64] bits/setjmp.h namespace
3668 [21267] network: [mips] bits/socket.h IOC* namespace
3669 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3670 [21270] libc: mmap64 silently truncates large offset values
3671 [21275] libc: posix_spawn always crashes on ia64 now
3672 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3673 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3674 [21289] libc: Incorrect declaration for 32-bit platforms with
3675 _FILE_OFFSET_BITS=64 causes build error
3676 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3677 not support gethostbyname4_r
3678 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3680 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3682 [21340] libc: Support POSIX_SPAWN_SETSID
3683 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3684 [21359] network: ns_name_pack needs additional byte in destination buffer
3685 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3686 against fragmentation attacks (CVE-2017-12132)
3687 [21369] network: resolv: Remove EDNS fallback
3688 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3690 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3691 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3692 [21393] stdio: Missing dup3 error check in freopen, freopen64
3693 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3694 [21399] localedata: Bad description for U00EC in
3695 localedata/charmaps/CP1254
3696 [21411] malloc: realloc documentation error
3697 [21426] network: sys/socket.h uio.h namespace
3698 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3699 [21445] libc: signal.h bsd_signal namespace
3700 [21455] network: Network headers stdint.h namespace
3701 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3703 [21475] network: resolv: Overlong search path is truncated mid-label
3704 [21511] libc: sigstack namespace
3705 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3706 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3707 bits/syscall.h: No such file or directory
3708 [21517] libc: struct sigaltstack namespace
3709 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3710 [21533] localedata: Update locale data to Unicode 10.0
3712 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3713 junk at end of line, first unrecognized character is `@'
3714 [21538] libc: SIG_HOLD missing for XPG4
3715 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3716 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3717 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3718 [21543] libc: sigevent namespace
3719 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3720 size for general purpose registers in mcontext_t structure
3721 [21550] libc: sigwait namespace
3722 [21552] libc: XPG4 bsd_signal namespace
3723 [21554] libc: sigpause namespace
3724 [21560] libc: sys/wait.h signal.h namespace
3725 [21561] libc: waitid namespace
3726 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3727 '/usr/include/stdlib.h': Permission denied
3728 [21575] libc: sys/wait.h missing struct rusage definition
3729 [21584] libc: sigaltstack etc namespace
3730 [21597] libc: siginterrupt namespace
3731 [21607] math: hppa: FAIL: math/test-tgmath
3732 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3734 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3735 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3736 stack and heap (CVE-2017-1000366)
3737 [21625] libc: wait3 namespace
3738 [21654] nss: Incorrect pointer alignment in NSS group merge result
3740 [21657] network: Parse interface zone id for node-local multicast
3741 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3743 [21666] libc: .symver is used on common symbol
3744 [21668] network: resolv: res_init cross-thread broadcast introduces race
3746 [21687] math: tgmath.h totalorder, totalordermag return type
3747 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3749 [21696] libc: Incorrect assumption of of __cpu_mask in
3750 posix/sched_cpucount.c
3751 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3752 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3754 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3755 leading to relocation crash
3756 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3757 `resolv_conf_matches (resp, conf)' failed.
3758 [21710] localedata: Added Samoan language locale for Samoa
3759 [21711] localedata: Pashto yesstr/nostr locale are missing
3760 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3761 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3762 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3763 [21723] localedata: yesstr/nostr missing for Chinese language locale
3764 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3766 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3768 [21728] localedata: New Locale for Tongan language
3769 [21729] localedata: incorrect LC_NAME fields for hi_IN
3770 [21733] localedata: yesstr and nostr are missing for zh_HK
3771 [21734] localedata: Missing yesstr and nostr are for kw_GB
3772 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3773 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3774 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3775 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3777 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3779 [21749] localedata: Wrong abbreviated day name (“abday”) for
3781 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3782 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3783 [21759] localedata: missing yesstr and nostr for Tigrinya
3784 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3785 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3786 [21767] localedata: Missing Bislama locales
3787 [21768] localedata: Missing yesstr and nostr for aa_ET
3788 [21770] localedata: Missing Field in li_NL
3789 [21778] nptl: Robust mutex may deadlock
3790 [21779] libc: MicroBlaze segfaults when loading libpthread
3791 [21783] localedata: Fix int_select international_call_prefixes
3792 [21784] localedata: Inconsistency in country_isbn
3793 [21788] localedata: Missing Country Postal Abbreviations
3794 [21794] localedata: Added-country_isbn-for-Italy
3795 [21795] localedata: Add/Fix country_isbn for France
3796 [21796] localedata: Added country_isbn for Republic of Korea
3797 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3798 [21799] localedata: Added int_select international_call_prefixes
3799 [21801] localedata: Added int_select international_call_prefixes
3800 [21804] nptl: Double semicolon in thread-shared-types.h
3801 [21807] localedata: LC_ADDRESS fix for pap_CW
3802 [21808] localedata: Fix LC_ADDRESS for pap_AW
3803 [21821] localedata: Added country_name in mai_IN
3804 [21822] localedata: Fix LC_TIME for mai_IN
3805 [21823] localedata: missing yesstr, nostr for sa_IN
3806 [21825] localedata: Fix name_mrs for mag_IN
3807 [21828] localedata: 2.26 changelog should mention user visible changes
3809 [21835] localedata: Added Maithili language locale for Nepal
3810 [21838] localedata: Removed redundant data for the_NP
3811 [21839] localedata: Fix LC_MONETARY for ta_LK
3812 [21844] localedata: Fix Latin characters and Months Sequence.
3813 [21848] localedata: Fix mai_NP Title Name
3818 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3819 24731-2:2010, is supported to enable declarations of functions from that
3820 TR. Note that not all functions from that TR are supported by the GNU C
3823 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3824 18661-1:2014, is supported to enable declarations of functions and macros
3825 from that TS. Note that not all features from that TS are supported by
3828 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3829 18661-4:2015, is supported to enable declarations of functions and macros
3830 from that TS. Note that most features from that TS are not supported by
3833 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3834 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3835 Since the GNU C Library defaults to a much newer revision of POSIX, this
3836 will only affect programs that specifically request an old conformance
3837 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3838 see a change in the visible declarations, but a program compiled with
3839 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3842 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3843 defined by all multithreaded code, but glibc has not required this for
3846 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3847 means that in a future release, the macros “major”, “minor”, and “makedev”
3848 will only be available from <sys/sysmacros.h>.
3850 These macros are not part of POSIX nor XSI, and their names frequently
3851 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3852 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3853 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3856 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3857 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3858 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3860 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3861 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3862 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3863 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3864 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3865 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3866 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3867 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3868 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3869 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3870 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3873 * New <math.h> features are added from TS 18661-1:2014:
3875 - Signaling NaN macros: SNANF, SNAN, SNANL.
3877 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3878 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3879 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3881 - llogb functions: the llogb, llogbf and llogbl functions, and the
3882 FP_LLOGB0 and FP_LLOGBNAN macros.
3884 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3887 - Comparison macros: iseqsig.
3889 - Classification macros: iscanonical, issubnormal, iszero.
3891 - Total order functions: totalorder, totalorderf, totalorderl,
3892 totalordermag, totalordermagf, totalordermagl.
3894 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3896 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3897 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3899 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3900 are added to libc. They convert a floating-point number into string.
3902 * Most of glibc can now be built with the stack smashing protector enabled.
3903 It is recommended to build glibc with --enable-stack-protector=strong.
3904 Implemented by Nick Alcock (Oracle).
3906 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3907 intended to be used instead of memset() to erase sensitive data after use;
3908 the compiler will not optimize out calls to explicit_bzero even if they
3909 are "unnecessary" (in the sense that no _correct_ program can observe the
3910 effects of the memory clear).
3912 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3913 to float instead of double. This does not affect the ABI of any libraries
3914 that are part of the GNU C Library, but may affect the ABI of other
3915 libraries that use this type in their interfaces.
3917 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3918 float_t and double_t types are now defined to long double instead of float
3919 and double. These options are not the default, and this does not affect
3920 the ABI of any libraries that are part of the GNU C Library, but it may
3921 affect the ABI of other libraries that use this type in their interfaces,
3922 if they are compiled or used with those options.
3924 * The getentropy and getrandom functions, and the <sys/random.h> header file
3927 * The buffer size for byte-oriented stdio streams is now limited to 8192
3928 bytes by default. Previously, on Linux, the default buffer size on most
3929 file systems was 4096 bytes (and thus remains unchanged), except on
3930 network file systems, where the buffer size was unpredictable and could be
3931 as large as several megabytes.
3933 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3934 for the Linux quota interface which predates kernel version 2.4.22 has
3937 * The malloc_get_state and malloc_set_state functions have been removed.
3938 Already-existing binaries that dynamically link to these functions will
3939 get a hidden implementation in which malloc_get_state is a stub. As far
3940 as we know, these functions are used only by GNU Emacs and this change
3941 will not adversely affect already-built Emacs executables. Any undumped
3942 Emacs executables, which normally exist only during an Emacs build, should
3943 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3945 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3946 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3947 “no-ip6-dotint” had already been the default, and support for the
3948 “ip6-dotint” option was removed from the Internet in 2006.
3950 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3951 flag from <resolv.h> have been removed. The option relied on a
3952 backwards-incompatible DNS extension which was never deployed on the
3955 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3956 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3957 They were already unimplemented.
3959 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3960 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3961 removed again from the IETF name lookup interface specification in RFC
3962 2553. Applications should use getaddrinfo instead.
3964 * DNSSEC-related declarations and definitions have been removed from the
3965 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3966 decode the data part of DNSSEC record types. Previous versions of glibc
3967 only implemented minimal support for the previous version of DNSSEC, which
3968 is incompatible with the currently deployed version.
3970 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3971 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3972 <arpa/nameser.h> header file because the distinction between RR types and
3973 meta-RR types is not officially standardized, subject to revision, and
3974 thus not suitable for encoding in a macro.
3976 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3977 and rhook members of the res_state type in <resolv.h> have been removed.
3978 The glibc stub resolver did not support these hooks, but the header file
3979 did not reflect that.
3981 * For multi-arch support it is recommended to use a GCC which has
3982 been built with support for GNU indirect functions. This ensures
3983 that correct debugging information is generated for functions
3984 selected by IFUNC resolvers. This support can either be enabled by
3985 configuring GCC with '--enable-gnu-indirect-function', or by
3986 enabling it by default by setting 'default_gnu_indirect_function'
3987 variable for a particular architecture in the GCC source file
3990 * GDB pretty printers have been added for mutex and condition variable
3991 structures in POSIX Threads. When installed and loaded in gdb these pretty
3992 printers show various pthread variables in human-readable form when read
3993 using the 'print' or 'display' commands in gdb.
3995 * Tunables feature added to allow tweaking of the runtime for an application
3996 program. This feature can be enabled with the '--enable-tunables' configure
3997 flag. The GNU C Library manual has details on usage and README.tunables has
3998 instructions on adding new tunables to the library.
4000 * A new version of condition variables functions have been implemented in
4001 the NPTL implementation of POSIX Threads to provide stronger ordering
4004 * A new version of pthread_rwlock functions have been implemented to use a more
4005 scalable algorithm primarily through not using a critical section anymore to
4008 Security related changes:
4010 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4011 have been created with makecontext could fail to terminate due to a
4012 missing .cantunwind annotation. This has been observed to lead to a hang
4013 (denial of service) in some Go applications compiled with gccgo. Reported
4014 by Andreas Schwab. (CVE-2016-6323)
4016 * The DNS stub resolver functions would crash due to a NULL pointer
4017 dereference when processing a query with a valid DNS question type which
4018 was used internally in the implementation. The stub resolver now uses a
4019 question type which is outside the range of valid question type values.
4022 The following bugs are resolved with this release:
4024 [4099] stdio: Overly aggressive caching by stream i/o functions.
4025 [7065] build: Support building glibc with -fstack-protector or -fstack-
4027 [9842] localedata: en_CA: incorrect date format
4028 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4029 before it started waiting
4030 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4031 [15765] nptl: sem_open is wrongly a cancellation point
4032 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4033 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4035 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4036 library linked with pthread
4037 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4038 "FIXME: Ingo" issue)
4039 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4040 [17252] libc: getrandom and getentropy syscall
4041 [17730] malloc: thread-local storage is sometimes improperly free()'d
4042 after being __libc_memalign()'d
4043 [18241] stdio: failed fseek on memstream does not set errno and can fail
4045 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4047 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4048 PTHREAD_PRIO_INHERIT mutex on ARM
4049 [18784] network: res_query and related function crash for special record
4050 type queries (CVE-2015-5180)
4051 [19380] math: strtod does not raise "inexact"
4052 [19387] string: Integer overflow in memchr
4053 [19390] string: Integer overflow in strncat
4054 [19398] build: linknamespace tests fail with massively parallel build
4055 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4057 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4058 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4059 [19514] libc: [PATCH] Fix spelling errors in spelling
4060 "implement"/"implementation" in several places
4061 [19582] network: Deprecate RES_USE_INET6
4062 [19673] manual: clog10 docs appear to be erroneous
4063 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4064 causes a segmentation fault
4065 [19826] libc: invalid pointer returned from __tls_get_addr with static
4067 [20016] network: resolv: Remove hooks support from the API
4068 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4070 [20033] math: [x86_64] vectorized math function don't call the __finite
4072 [20116] nptl: use after free in pthread_create
4073 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4074 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4076 [20311] nptl: please install proc_service.h
4077 [20366] libc: Compilation errors in installed headers in strict-compliance
4079 [20370] malloc: malloc: Arena free list management is still racy
4080 (incorrect fix in bug 19243)
4081 [20386] libc: assert (X = 0) does not result in GCC warning
4082 [20432] malloc: malloc: Minimize interface required for interposition
4083 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4084 in _Unwind_Backtrace (CVE-2016-6323)
4085 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4086 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4088 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4089 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4090 [20477] network: resolv: incorrect double-checked locking related to
4092 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4094 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4096 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4097 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4098 cause transition penalty
4099 [20517] math: sparcv9 missing fdiml compat symbol
4100 [20524] manual: strverscmp is inconsistent
4101 [20525] libc: <sys/quota.h> should be based on kernel headers
4102 [20539] math: GCC 7 -static -lm fails to link at -O3
4103 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4105 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4107 [20591] network: Remove obsolete DNSSEC support
4108 [20592] network: DNS resource record type classification macros in
4109 <arpa/nameser.h> are incorrect
4110 [20593] network: Update DNS RR type definitions
4111 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4112 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4114 [20629] network: libresolv: Remove support for bitstring labels
4116 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4117 assertion: "maxidx >= 2"
4118 [20660] math: [arm] Use VSQRT
4119 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4120 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4121 [20689] libc: Test for FMA should also check for AVX.
4122 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4123 [20715] math: iszero macro breaks existing code
4124 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4125 [20728] libc: powerpc: Missing TOC stub in clone
4126 [20729] build: glibc-2.24 fails to build for i486 with -Os
4127 [20750] build: Build fails with default PIE enabled gcc-6.x
4128 [20768] math: [alpha] sqrt fegetenv namespace
4129 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4131 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4132 __FLT_EVAL_METHOD__ is 2
4133 [20790] network: rpcgen buffer overrun in get_prog_declaration
4134 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4135 [20829] libc: crypt snprintf namespace
4136 [20847] libc: tst-vfork3 failure
4137 [20855] math: Default bits/mathdef.h has inappropriate float_t
4138 [20859] math: [sh4] FP_ILOGB0 invalid
4139 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4140 U+20AC), not same as GBK
4141 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4142 [20916] math: pow handling of sNaN arguments
4143 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4144 [20919] math: Bad pow (qNaN, 0) result with -lieee
4145 [20940] math: hypot sNaN handling
4146 [20947] math: fmax, fmin sNaN handling
4147 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4148 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4150 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4151 [20973] nptl: robust mutexes: Lost wake-ups
4152 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4153 [20978] nis: strlen on null pointer in nss_nisplus
4154 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4156 [21014] string: i686 memchr overflows internal pointer check
4157 [21019] libc: [mips] n32 lseek incorrect on overflow
4158 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4159 [21026] libc: [MIPS] readahead syscall is broken on n64
4160 [21028] math: Fallback fesetexceptflag should always succeed
4161 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4162 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4164 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4165 [21061] librt: [microblaze] librt lost clock_* exports
4166 [21073] libc: tunables: insecure environment variables passed to
4167 subprocesses with AT_SECURE
4168 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4172 * The minimum Linux kernel version that this version of the GNU C Library
4173 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4174 kernel version 2.6.32 or later suffices (on architectures that already
4175 required kernel versions more recent than 3.2, those requirements remain
4176 unchanged). Linux 3.2 or later kernel headers are required on all
4179 * The pap_AN locale has been deleted. This has been deprecated for a long
4180 time. It has been replaced by pap_AW & pap_CW, both of which have long
4181 been included in previous releases.
4183 * The readdir_r and readdir64_r functions have been deprecated. It is
4184 recommended to use readdir and readdir64 instead.
4186 * The type “union wait” has been removed. It was deprecated in the early
4187 1990s and never part of POSIX. Application code should use the int type
4188 instead of “union wait”.
4190 * A new NSS action is added to facilitate large distributed system
4191 administration. The action, MERGE, allows remote user stores like LDAP
4192 to be merged into local user stores like /etc/groups in order to provide
4193 easy to use, updated, and managed sets of merged credentials. The new
4194 action can be used by configuring it in /etc/nsswitch.conf:
4195 group: files [SUCCESS=merge] nis
4196 Implemented by Stephen Gallagher (Red Hat).
4198 * The deprecated __malloc_initialize_hook variable has been removed from the
4201 * The long unused localedef --old-style option has been removed. It hasn't
4202 done anything in over 16 years. Scripts using this option can safely
4205 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4206 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4207 return the next representable value in the direction of positive infinity
4208 and the nextdown functions return the next representable value in the
4209 direction of negative infinity. These are currently enabled as GNU
4212 Security related changes:
4214 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4215 could result in a stack overflow when getnetbyname was called with an
4216 overly long name. (CVE-2016-3075)
4218 * Previously, getaddrinfo copied large amounts of address data to the stack,
4219 even after the fix for CVE-2013-4458 has been applied, potentially
4220 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4221 instead. Reported by Michael Petlan. (CVE-2016-3706)
4223 * The glob function suffered from a stack-based buffer overflow when it was
4224 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4225 Reported by Alexander Cherepanov. (CVE-2016-1234)
4227 * The Sun RPC UDP client could exhaust all available stack space when
4228 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4229 alloca plugin for GCC. (CVE-2016-4429)
4231 * The IPv6 name server management code in libresolv could result in a memory
4232 leak for each thread which is created, performs a failing naming lookup,
4233 and exits. Over time, this could result in a denial of service due to
4234 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4236 The following bugs are resolved with this release:
4238 [1170] localedata: ne_NP: update Nepali locale definition file
4239 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4241 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4242 [6796] math: fdim() does not set errno on overflow
4243 [10354] libc: posix_spawn should use vfork() in more cases than presently
4244 [11213] localedata: localedata: add copyright disclaimer to locale files
4245 [12143] localedata: chr_US: new Cherokee locale
4246 [12450] localedata: sgs_LT: new locale
4247 [12676] localedata: ln_CD: new locale
4248 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4250 [13304] math: fma, fmaf, fmal produce wrong results
4251 [14259] build: --localedir arg to configure is ignored
4252 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4253 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4254 [14934] localedata: es_CL: wrong first weekday chilean locale
4255 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4257 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4259 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4260 [15368] nptl: raise() is not async-signal-safe
4261 [15479] math: ceil, floor, round and trunc raise inexact exception
4262 [15578] localedata: kk_KZ: various updates
4263 [16003] localedata: pap_AN: punt old locale
4264 [16137] localedata: iw_IL: punt old locale
4265 [16190] localedata: eo: new esperanto locale
4266 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4267 [16742] malloc: race condition: pthread_atfork() called before first
4268 malloc() results in unexpected locking behaviour/deadlocks
4269 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4271 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4272 [17565] localedata: pt_PT: wrong (work-)week start
4273 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4274 [17950] build: Build fails with -msse
4275 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4276 [18433] libc: posix_spawn does not return correctly upon failure to
4278 [18453] localedata: charmaps/IBM875: incorrect codes
4279 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4281 [18896] localedata: he_IL: improvements for currency
4282 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4283 Romanian locale data
4284 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4286 [19056] libc: Deprecate readdir_r
4287 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4289 [19198] localedata: nl_NL: small improvements for Dutch locales
4290 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4291 nameservers (CVE-2016-5417)
4292 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4294 [19400] locale: Language missing in "iso-639.def", trivial fix in
4296 [19431] malloc: Deadlock between fflush, getdelim, and fork
4297 [19505] libc: Incorrect file descriptor validity checks in
4298 posix_spawn_file_actions_add{open,close,dup2}
4299 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4300 when using RTLD_NEXT
4301 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4302 `intl/{gettextP,loadinfo}.h'
4303 [19534] libc: execle, execlp may use malloc
4304 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4305 [19573] network: res_nclose and __res_maybe_init disagree about name
4306 server initialization, breaking Hesiod
4307 [19575] localedata: Status of GB18030 tables
4308 [19581] localedata: sr_* date_fmt string contains additional newline
4309 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4311 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4312 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4313 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4314 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4316 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4318 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4320 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4321 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4322 [19633] locale: strfmon_l applies global locale to number formatting
4323 [19642] network: Memory leak in getnameinfo
4324 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4325 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4327 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4328 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4330 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4331 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4333 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4335 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4337 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4338 pointers and lengths in error-case.
4339 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4340 report errors on UTF-16 surrogates values.
4341 [19755] nscd: nscd assertion failure in gc
4342 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4343 [19759] libc: mempcpy shouldn't be inlined
4344 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4345 [19765] libc: s390 needs an optimized mempcpy
4346 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4347 NAME_MAX limit assumption (CVE-2016-1234)
4348 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4349 [19787] network: Missing and incorrect truncation checks in getnameinfo
4350 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4352 [19791] network: Assertion failure in res_query.c with un-connectable name
4354 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4355 [19822] math: libm.so install clobbers old version
4356 [19825] network: resolv: send_vc can return uninitialized data in second
4357 response to getaddrinfo
4358 [19830] network: nss_dns: should check RDATA length against buffer length
4359 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4360 confronted with A/AAAA records of invalid size
4361 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4362 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4363 [19853] stdio: Printing IBM long double in decimal with high precision is
4365 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4366 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4367 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4369 [19865] network: Assertion failure or memory leak in
4370 _nss_dns_getcanonname_r
4371 [19868] network: nss_dns: netent code does not skip over non-PTR records
4372 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4374 [19881] string: Improve x86-64 memset
4375 [19907] string: Incorrect memcpy tests
4376 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4378 [19925] libc: termios.h XCASE namespace
4379 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4380 [19929] libc: limits.h NL_NMAX namespace
4381 [19931] stdio: Memory leak in vfprintf
4382 [19957] libc: clone(CLONE_VM) access invalid parent memory
4383 [19963] localedata: en_IL: New locale
4384 [19989] stdio: stdio.h cuserid namespace
4385 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4387 [19996] locale: langinfo.h nl_langinfo_l namespace
4388 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4389 [20010] network: getaddrinfo: Stack overflow in hostent translation
4391 [20012] stdio: libio: fmemopen append mode failure
4392 [20014] stdio: stdio.h namespace for pre-threads POSIX
4393 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4394 [20023] libc: fcntl.h timespec namespace
4395 [20024] math: [x86_64] vectorized sincos trashes the stack
4396 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4397 [20041] time: sys/time.h timespec namespace
4398 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4399 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4400 [20051] libc: ttyslot in wrong header under wrong conditions
4401 [20054] libc: gethostname not declared for XPG4
4402 [20055] libc: termios.h missing tcgetsid for XPG4
4403 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4405 [20073] libc: sys/stat.h fchmod namespace
4406 [20074] libc: stdlib.h rand_r namespace
4407 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4408 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4410 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4411 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4413 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4414 [20119] libc: Wrong mask for processors level type from CPUID
4415 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4416 AS not supporting AVX512
4417 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4419 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4420 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4422 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4423 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4424 [20178] libc: posix_spawn{p} should not call exit
4425 [20191] stdio: libio: vtables hardening
4426 [20195] string: FMA4 detection requires CPUID execution with register
4428 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4429 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4431 [20212] math: acos (sNaN) returns sNaN
4432 [20213] math: asin (sNaN) returns sNaN
4433 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4434 [20218] math: [i386] asinhl (sNaN) returns sNaN
4435 [20219] math: [i386] atanhl (sNaN) returns sNaN
4436 [20222] stdio: fopencookie: Mangle function pointers
4437 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4438 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4439 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4441 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4442 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4443 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4444 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4445 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4446 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4447 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4448 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4449 [20240] math: modf (sNaN) returns sNaN
4450 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4451 [20250] math: frexp (sNaN) returns sNaN
4452 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4453 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4455 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4456 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4457 subscript is below array bounds [-Werror=array-bounds]
4458 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4459 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4461 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4462 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4464 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4465 "invalid" exceptions
4466 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4467 [20316] localedata: id_ID: Februari instead of Pebruari
4468 [20327] string: POWER8 strcasecmp returns incorrect result
4469 [20347] math: Failure: Test: j0_downward (0xap+0)
4470 [20348] libc: FAIL: misc/tst-preadvwritev64
4471 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4472 [20350] libc: There is no test for p{read,write}64
4473 [20357] math: Incorrect cos result for 1.5174239687223976
4474 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4478 * Unicode 8.0.0 Support: Character encoding, character type info, and
4479 transliteration tables are all updated to Unicode 8.0.0, using new
4480 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4481 These updates cause user visible changes, such as the fixes for bugs
4482 89, 16061, and 18568.
4484 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4485 kernel-internal CPU set size. This means that requests that change the
4486 CPU affinity which failed before (for example, an all-ones CPU mask) will
4487 now succeed. Applications that need to determine the effective CPU
4488 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4489 setting it because the kernel can adjust it (and the previous size check
4490 would not detect this in the majority of cases).
4492 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4493 the following new symbols are used: fts64_children, fts64_close,
4494 fts64_open, fts64_read and fts64_set.
4496 * getaddrinfo now detects certain invalid responses on an internal netlink
4497 socket. If such responses are received, an affected process will
4498 terminate with an error message of "Unexpected error <number> on netlink
4499 descriptor <number>" or "Unexpected netlink response of size <number> on
4500 descriptor <number>". The most likely cause for these errors is a
4501 multi-threaded application which erroneously closes and reuses the netlink
4502 file descriptor while it is used by getaddrinfo.
4504 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4505 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4506 unnecessary serialization of memory allocation requests across threads.
4507 The defect is now corrected. Users should see a substantial increase in
4508 the concurrent throughput of allocation requests for applications which
4509 trigger this bug. Affected applications typically create and
4510 destroy threads frequently. (Bug 19048 was reported and analyzed by
4513 * There is now a --disable-timezone-tools configure option for disabling the
4514 building and installing of the timezone related utilities (zic, zdump, and
4515 tzselect). This is useful for people who build the timezone data and code
4516 independent of the GNU C Library.
4518 * The obsolete header <regexp.h> has been removed. Programs that require
4519 this header must be updated to use <regex.h> instead.
4521 * The obsolete functions bdflush, create_module, get_kernel_syms,
4522 query_module and uselib are no longer available to newly linked binaries;
4523 the header <sys/kdaemon.h> has been removed. These functions and header
4524 were specific to systems using the Linux kernel and could not usefully be
4525 used with the GNU C Library on systems with version 2.6 or later of the
4528 * Optimized string, wcsmbs and memory functions for IBM z13.
4529 Implemented by Stefan Liebler.
4531 * Newly linked programs that define a variable called signgam will no longer
4532 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4533 require signgam to be set by those functions must ensure that they use the
4534 variable provided by the GNU C Library and declared in <math.h>, without
4535 defining their own copy.
4537 * The minimum GCC version that can be used to build this version of the GNU
4538 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4539 still be used to compile programs using the GNU C Library.
4541 Security related changes:
4543 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4544 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4546 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4547 the pointer guard feature. It is always enabled. Previously,
4548 LD_POINTER_GUARD could be used to disable security hardening in binaries
4549 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4552 * An integer overflow in hcreate and hcreate_r could lead to an
4553 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4555 * The catopen function no longer has unbounded stack usage. Reported by
4556 Max. (CVE-2015-8779)
4558 * The nan, nanf and nanl functions no longer have unbounded stack usage
4559 depending on the length of the string passed as an argument to the
4560 functions. Reported by Joseph Myers. (CVE-2014-9761)
4562 * A stack-based buffer overflow was found in libresolv when invoked from
4563 libnss_dns, allowing specially crafted DNS responses to seize control
4564 of execution flow in the DNS client. The buffer overflow occurs in
4565 the functions send_dg (send datagram) and send_vc (send TCP) for the
4566 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4567 family. The use of AF_UNSPEC triggers the low-level resolver code to
4568 send out two parallel queries for A and AAAA. A mismanagement of the
4569 buffers used for those queries could result in the response of a query
4570 writing beyond the alloca allocated buffer created by
4571 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4572 the overflow. Thanks to the Google Security Team and Red Hat for
4573 reporting the security impact of this issue, and Robert Holiday of
4574 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4576 The following bugs are resolved with this release:
4578 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4579 [887] math: Math library function "logb" and "nextafter" inconsistent
4580 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4581 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4582 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4583 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4585 [4404] localedata: German translation of "Alarm clock" is misleading
4586 [6799] math: nextafter() and nexttoward() doesn't set errno on
4587 overflow/underflow errors
4588 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4590 [10432] nis: _nss_nis_setnetgrent assertion failure
4591 [11460] libc: fts has no LFS support
4592 [12926] network: getaddrinfo()/make_request() may spin forever
4593 [13065] nptl: Race condition in pthread barriers
4594 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4595 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4597 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4598 [14912] libc: Rename non-installed bits/*.h headers
4599 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4600 [15367] math: Let gcc use __builtin_isinf
4601 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4602 [15421] math: lgamma wrongly sets signgam for ISO C
4603 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4604 FE_INVALID with argument out of range
4605 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4607 [15786] dynamic-link: ifunc resolver functions can smash function
4609 [15918] math: Unnecessary check for equality in hypotf()
4610 [16061] localedata: Review / update transliteration data
4611 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4613 [16141] time: strptime %z offset restriction
4614 [16171] math: drem should be alias of remainder
4615 [16296] math: fegetround is pure?
4616 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4617 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4619 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4620 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4622 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4623 "Exception "Inexact" set" on ppc32
4624 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4625 [16517] math: Missing underflow exception from tanf/tan/tanl
4626 [16519] math: Missing underflow exception from sinhf
4627 [16520] math: Missing underflow exception from tanhf
4628 [16521] math: Missing underflow exception from exp2
4629 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4631 [16734] stdio: fopen calls mmap to allocate its buffer
4632 [16961] math: nan function incorrect handling of bad sequences
4633 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4634 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4635 [16985] locale: localedef: confusing error message when opening output
4637 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4638 [17197] locale: Redundant shift character in iconv conversion output at
4640 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4641 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4642 [17250] dynamic-link: static linking breaks nss loading
4643 (getaddrinfo/getpwnam/etc...)
4644 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4646 [17441] math: isnan() should use __builtin_isnan() in GCC
4647 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4648 (related to lock elision)
4649 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4650 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4651 [17887] time: strptime should be able to parse "+01:00" style timezones
4652 [17905] libc: catopen() Multiple unbounded stack allocations
4654 [18084] libc: backtrace (..., 0) dumps core on x86
4655 [18086] libc: nice() sets errno to 0 on success
4656 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4657 is too large (CVE-2015-8778)
4658 [18251] dynamic-link: SONAME missing when audit modules provides path
4659 [18265] libc: add attributes for wchar string and memory functions
4660 [18370] math: csqrt missing underflows
4661 [18421] libc: [hppa] read-only segment has dynamic relocations
4662 [18472] libc: Obsolete syscall wrappers should be compat symbols
4663 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4664 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4665 [18525] localedata: Remove locale timezone information
4666 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4667 [18568] localedata: Update locale data to Unicode 8.0
4668 [18589] locale: sort-test.sh fails at random
4669 [18595] math: ctan, ctanh missing underflows
4670 [18604] libc: assert macro-expands its argument
4671 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4672 contains a vector instruction exception.
4673 [18611] math: j1, jn missing errno setting on underflow
4674 [18618] localedata: sync Chechen locale definitions with other *_RU
4676 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4677 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4678 [18665] network: In send_dg, the recvfrom function is NOT always using the
4679 buffer size of a newly created buffer (CVE-2015-7547)
4680 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4682 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4684 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4685 [18699] math: tilegx cproj() for various complex infinities does not yield
4687 [18724] libc: Harden put*ent functions against data injection
4688 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4689 [18755] build: build errors with -DNDEBUG
4690 [18757] stdio: fmemopen fails to set errno on failure
4691 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4693 [18781] libc: openat64 lacks O_LARGEFILE
4694 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4695 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4696 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4697 [18790] math: [ldbl-128ibm] tanhl inaccurate
4698 [18795] libc: stpncpy fortification misses buffer lengths that are
4699 statically too large
4700 [18796] build: build fails for --disable-mathvec
4701 [18803] math: hypot missing underflows
4702 [18820] stdio: fmemopen may leak memory on failure
4703 [18823] math: csqrt spurious underflows
4704 [18824] math: fma spurious underflows
4705 [18825] math: pow missing underflows
4706 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4707 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4708 [18870] build: sem_open.c fails to compile with missing symbol
4710 [18872] stdio: Fix memory leak in printf_positional
4711 [18873] libc: posix_fallocate overflow check ineffective
4712 [18875] math: Excess precision leads incorrect libm
4713 [18877] libc: arm: mmap offset regression
4714 [18887] libc: memory corruption when using getmntent on blank lines
4715 [18918] localedata: hu_HU: change time to HH:MM:SS format
4716 [18921] libc: Regression: extraneous stat() and fstat() performed by
4718 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4719 binaries (CVE-2015-8777)
4720 [18951] math: tgamma missing underflows
4721 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4723 [18953] localedata: lt_LT: change currency symbol to the euro
4724 [18956] math: powf inaccuracy
4725 [18961] math: [i386] exp missing underflows
4726 [18966] math: [i386] exp10 missing underflows
4727 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4728 [18969] build: multiple string test failures due to missing locale
4730 [18970] libc: Reference of pthread_setcancelstate in libc.a
4731 [18977] math: float / long double Bessel functions not in XSI POSIX
4732 [18980] math: i386 libm functions return with excess range and precision
4733 [18981] math: i386 scalb*, ldexp return with excess range and precision
4734 [18982] stdio: va_list and vprintf
4735 [18985] time: Passing out of range data to strftime() causes a segfault
4737 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4738 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4739 [19012] locale: iconv_open leaks memory on error path
4740 [19016] math: clog, clog10 inaccuracy
4741 [19018] nptl: Mangle function pointers in tls_dtor_list
4742 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4743 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4744 [19048] malloc: malloc: arena free list can become cyclic, increasing
4746 [19049] math: [powerpc] erfc incorrect zero sign
4747 [19050] math: [powerpc] log* incorrect zero sign
4748 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4749 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4750 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4751 [19074] network: Data race in _res_hconf_reorder_addrs
4752 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4753 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4754 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4756 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4758 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4759 [19086] manual: posix_fallocate64 documented argument order is wrong.
4760 [19088] math: lround, llround missing exceptions close to overflow
4762 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4763 [19095] math: dbl-64 lrint incorrect for 64-bit long
4764 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4765 [19124] dynamic-link: ld.so failed to build with older assembler
4766 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4767 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4768 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4769 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4770 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4771 pthread_setaffinity_np
4772 [19156] math: [ldbl-128] j0l spurious underflows
4773 [19164] nptl: tst-getcpu fails with many possible CPUs
4774 [19168] math: math/test-ildoubl and math/test-ldouble failure
4775 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4776 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4778 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4779 (FE_NOMASK_ENV) do not clear SSE exceptions
4780 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4781 _int_new_arena/reused_arena
4782 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4783 [19201] math: dbl-64 remainder incorrect sign of zero result
4784 [19205] math: bits/math-finite.h conditions do not match math.h and
4786 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4787 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4788 for C99-based standards
4789 [19212] libc: features.h not -Wundef clean
4790 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4792 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4793 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4794 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4796 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4797 "inexact" exceptions
4798 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4800 [19242] libc: strtol incorrect in Turkish locales
4801 [19243] malloc: reused_arena can pick an arena on the free list, leading
4802 to an assertion failure and reference count corruption
4803 [19253] time: tzset() ineffective when temporary TZ did not include DST
4805 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4806 [19270] math: [hppa] Shared libm missing __isnanl
4807 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4808 MAP_HUGETLB and MAP_STACK defines
4809 [19313] nptl: Wrong __cpu_mask for x32
4810 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4811 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4812 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4813 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4814 [19363] time: x32: times() return value wrongly truncates/sign extends
4816 [19367] dynamic-link: Improve branch prediction on Silvermont
4817 [19369] network: Default domain name not reset by res_ninit when "search"
4818 / "domain" entry is removed from resolv.conf
4819 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4821 [19385] localedata: bg_BG: time separator should be colon, not comma
4822 [19408] libc: linux personality syscall wrapper may erroneously return an
4823 error on 32-bit architectures
4824 [19415] libc: dladdr returns wrong names on hppa
4825 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4826 IBM905, IBM907, and IBM909
4827 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4828 [19443] build: build failures with -DDEBUG
4829 [19451] build: Make check fails on test-double-vlen2
4830 [19462] libc: Glibc failed to build with -Os
4831 [19465] math: Wrong code with -Os
4832 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4834 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4836 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4837 [19486] math: S390: Math tests fail with "Exception Inexact set".
4838 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4839 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4841 [19590] math: Fail to build shared objects that use libmvec.so functions.
4845 * The following bugs are resolved with this release:
4847 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4848 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4849 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4850 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4851 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4852 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4853 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4854 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4855 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4856 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4857 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4858 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4859 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4860 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4861 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4862 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4863 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4864 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4865 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4866 18657, 18676, 18694, 18696, 18887.
4868 * Cache information can be queried via sysconf() function on s390 e.g. with
4869 _SC_LEVEL1_ICACHE_SIZE as argument.
4871 * A buffer overflow in gethostbyname_r and related functions performing DNS
4872 requests has been fixed. If the NSS functions were called with a
4873 misaligned buffer, the buffer length change due to pointer alignment was
4874 not taken into account. This could result in application crashes or,
4875 potentially arbitrary code execution, using crafted, but syntactically
4876 valid DNS responses. (CVE-2015-1781)
4878 * The time zone file parser has been made more robust against crafted time
4879 zone files, avoiding heap buffer overflows related to the processing of
4880 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4881 large time zone data files. Overly long time zone specifiers in the TZ
4882 variable no longer result in stack overflows and crashes.
4884 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4885 for LD and GD on x86 and x86-64, has been implemented. You will need
4886 binutils-2.24 or later to enable this optimization.
4888 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4889 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4890 Hat). These updates cause user visible changes, such as the fix for bug
4893 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4894 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4895 condition in some applications.
4897 * Added vector math library named libmvec with the following vectorized x86_64
4898 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4900 The library can be disabled with --disable-mathvec. Use of the functions is
4901 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4902 Shared library libmvec.so is linked in as needed when using -lm (no need to
4903 specify -lmvec explicitly for not static builds).
4904 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4906 * A new fmemopen implementation has been added with the goal of POSIX
4907 compliance. The new implementation fixes the following long-standing
4908 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4909 old implementation is still present for use be by existing binaries.
4911 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4912 releases. It has been fixed to match 2.19 and older, but binaries built
4913 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4915 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4916 Contributed by Roland McGrath (Google).
4918 * The header <regexp.h> is deprecated, and will be removed in a future
4919 release. Use of this header will trigger a deprecation warning.
4920 Application developers should update their code to use <regex.h> instead.
4922 This header was formerly part of SUS, but was deprecated in 1994 and
4923 removed from the standard in 2001. Also, the glibc implementation
4924 leaks memory. See BZ#18681 for more details.
4928 * The following bugs are resolved with this release:
4930 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4931 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4932 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4933 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4934 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4935 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4936 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4937 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4938 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4939 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4942 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4943 too little memory for the to-be-scanned arguments and overflow the
4944 allocated buffer. The implementation now correctly computes the required
4945 buffer size when using malloc, and switches to malloc from alloca as
4948 * A new semaphore algorithm has been implemented in generic C code for all
4949 machines. Previous custom assembly implementations of semaphore were
4950 difficult to reason about or ensure that they were safe. The new version
4951 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4952 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4953 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4955 * Port to Altera Nios II has been contributed by Mentor Graphics.
4957 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4958 implementations for powerpc64/powerpc64le.
4959 Implemented by Adhemerval Zanella (IBM).
4961 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4962 and powerpc64le. This may improve lock scaling of existing programs on
4963 HTM capable systems. The lock elision code is only enabled with
4964 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4965 powerpc will issue a transaction abort on every syscall to avoid side
4966 effects being visible outside transactions.
4968 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4969 AArch64. Contributed by ARM Ltd.
4971 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4973 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4974 under certain input conditions resulting in the execution of a shell for
4975 command substitution when the application did not request it. The
4976 implementation now checks WRDE_NOCMD immediately before executing the
4977 shell and returns the error WRDE_CMDSUB as expected.
4979 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4980 processing format strings with a large number of format specifiers.
4982 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4983 infinite loop if the DNS response contained a PTR record of an unexpected
4986 * The minimum GCC version that can be used to build this version of the GNU
4987 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4988 still be used to compile programs using the GNU C Library.
4990 * The GNU C Library is now built with -Werror by default. This can be
4991 disabled by configuring with --disable-werror.
4993 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4995 * The obsolete sigvec function has been removed. This was the original
4996 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4997 programs have been using instead for about 25 years. Of course, ABI
4998 compatibility for old binaries using sigvec remains intact.
5000 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
5001 with newer versions of bison.
5003 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
5004 The original MIPS o32 hard-float ABI requires an FPU where double-precision
5005 registers overlay two consecutive single-precision registers. MIPS32R2
5006 introduced a new FPU mode (FR=1) where double-precision registers extend the
5007 corresponding single-precision registers which is incompatible with the
5008 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5009 require the use of FR=1 making a transition necessary. New o32 ABI
5010 extensions enable users to migrate over time from the original o32 ABI
5011 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5012 tracks the ABI of any loaded object and verifies that new objects are
5013 compatible. Mode transitions will also be requested as required and
5014 unsupportable objects will be rejected. The ABI checks include both soft and
5015 hard float ABIs for o32, n32 and n64.
5017 GCC 5 with GNU binutils 2.25 onwards:
5018 It is strongly recommended that all o32 system libraries are built using the
5019 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5020 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5021 compiler using --with-fp-32=xx to set this by default.
5025 * The following bugs are resolved with this release:
5027 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5028 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5029 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5030 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5031 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5032 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5033 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5034 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5035 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5036 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5037 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5038 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5039 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5040 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5041 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5043 * Reverted change of ABI data structures for s390 and s390x:
5044 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5045 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5046 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5047 are preserved pointing straight to the same implementation as the old ones.
5048 Given that, new callers will simply provide a too-big buffer to these
5049 functions. Any applications/libraries out there that embed jmp_buf or
5050 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5051 against 2.19 headers will have to rebuilt again. This is necessary in any
5052 case to revert the breakage in their ABI caused by the glibc change.
5054 * Support for file description locks is added to systems running the
5055 Linux kernel. The standard file locking interfaces are extended to
5056 operate on file descriptions, not file descriptors, via the use of
5057 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5058 are associated with an open file instead of a process.
5060 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5062 * The minimum Linux kernel version that this version of the GNU C Library
5063 can be used with is 2.6.32.
5065 * Running the testsuite no longer terminates as soon as a test fails.
5066 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5067 with PASS or FAIL lines for individual tests. A summary of the results is
5068 printed, including a list of failing lists, and "make check" exits with
5069 error status if there were any unexpected failures. "make check
5070 stop-on-test-failure=y" may be used to keep the old behavior.
5072 * The am33 port, which had not worked for several years, has been removed
5075 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5076 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5077 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5078 conflicted with POSIX (support for which was removed in 2.19), the
5079 interfaces those macros enabled remain available when compiling with
5080 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5081 test macros defined.
5083 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5085 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5086 This may improve lock scaling of existing programs on TX capable systems.
5087 The lock elision code is only built with --enable-lock-elision=yes and
5088 then requires a GCC version supporting the TX builtins. With lock elision
5089 default mutexes are elided via __builtin_tbegin, if the cpu supports
5090 transactions. By default lock elision is not enabled and the elision code
5093 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5094 copy the path argument. This allowed programs to cause posix_spawn to
5095 deference a dangling pointer, or use an unexpected pathname argument if
5096 the string was modified after the posix_spawn_file_actions_addopen
5099 * All supported architectures now use the main glibc sysdeps directory
5100 instead of some being in a separate "ports" directory (which was
5101 distributed separately before glibc 2.17).
5103 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5104 On configurations that support it (all Linux configurations), it's now
5105 used regardless of the --enable-add-ons switch to configure. It is no
5106 longer possible to build such configurations without pthreads support.
5108 * Locale names, including those obtained from environment variables (LANG
5109 and the LC_* variables), are more tightly checked for proper syntax.
5110 setlocale will now fail (with EINVAL) for locale names that are overly
5111 long, contain slashes without starting with a slash, or contain ".." path
5112 components. (CVE-2014-0475) Previously, some valid locale names were
5113 silently replaced with the "C" locale when running in AT_SECURE mode
5114 (e.g., in a SUID program). This is no longer necessary because of the
5117 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5118 with application code using Intel MPX instructions. (With all previous
5119 versions, the MPX register state could be clobbered when making calls
5120 into or out of a shared library.) Note that while the new dynamic
5121 linker is compatible with all known x86 hardware whether or not it
5122 supports Intel MPX, some x86 instruction-set emulators might fail to
5123 handle the new instruction encodings. This is known to affect Valgrind
5124 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5125 release), and might affect other tools that do instruction emulation.
5127 * Support for loadable gconv transliteration modules has been removed.
5128 The support for transliteration modules has been non-functional for
5129 over a decade, and the removal is prompted by security defects. The
5130 normal gconv conversion modules are still supported. Transliteration
5131 with //TRANSLIT is still possible, and the //IGNORE specifier
5132 continues to be supported. (CVE-2014-5119)
5134 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5135 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5136 resulting a denial-of-service security vulnerability in applications which
5137 use functions related to iconv. (CVE-2014-6040)
5141 * The following bugs are resolved with this release:
5143 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5144 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5145 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5146 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5147 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5148 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5149 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5150 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5151 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5152 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5153 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5154 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5155 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5156 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5157 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5158 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5159 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5160 16431, 16453, 16474, 16506, 16510, 16529
5162 * Slovenian translations for glibc messages have been contributed by the
5163 Translation Project's Slovenian team of translators.
5165 * The public headers no longer use __unused nor __block. This change is to
5166 support compiling programs that are derived from BSD sources and use
5167 __unused internally, and to support compiling with Clang's -fblock
5168 extension which uses __block.
5170 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5171 large collation sequences to optimize multiple passes. This cache
5172 computation may overflow for large collation sequences and may cause a
5173 stack or buffer overflow. This is now fixed to use a slower algorithm
5174 which does not use a cache if there is an integer overflow.
5176 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5177 rules for large collation sequences to optimize multiple passes and falls
5178 back to alloca if malloc fails, resulting in a possible stack overflow.
5179 The implementation now falls back to an uncached collation sequence lookup
5182 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5183 initialized for static applications resulting in the security feature
5184 being disabled. The pointer guard is now correctly initialized to a
5185 random value for static applications. Existing static applications need
5186 to be recompiled to take advantage of the fix (bug 15754).
5188 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5189 to the d_name member of struct dirent, or omit the terminating NUL
5190 character. (Bugzilla #14699).
5192 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5193 aligned_alloc functions could allocate too few bytes or corrupt the
5194 heap when passed very large allocation size values (Bugzilla #15855,
5197 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5198 for AF_INET6 has been fixed (Bugzilla #16072).
5200 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5201 pap_CW, quz_PE, the_NP.
5203 * Substantially revised locales: gd_GB, ht_HT
5205 * The LC_ADDRESS field was updated to support country_car for almost all
5208 * ISO 1427 definitions were updated.
5210 * ISO 3166 definitions were updated.
5212 * The localedef utility now supports --big-endian and --little-endian
5213 command-line options to generate locales for a different system from that
5214 for which the C library was built.
5216 * Binary locale files now only depend on the endianness of the system for
5217 which they are generated and not on other properties of that system. As a
5218 consequence, binary files generated with new localedef may be incompatible
5219 with old versions of the GNU C Library, and binary files generated with
5220 old localedef may be incompatible with this version of the GNU C Library,
5221 in the following circumstances:
5223 + Locale files may be incompatible on m68k systems.
5225 + Locale archive files (but not separate files for individual locales) may
5226 be incompatible on systems where plain "char" is signed.
5228 * The configure option --disable-versioning has been removed. Builds with
5229 --disable-versioning had not worked for several years.
5231 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5232 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5234 * SystemTap probes for malloc have been introduced.
5236 * SystemTap probes for slow multiple precision fallback paths of
5237 transcendental functions have been introduced.
5239 * Support for powerpc64le has been added.
5241 * The soft-float powerpc port now supports e500 processors.
5243 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5245 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5246 set of header declarations that are enabled by default, even when other
5247 feature test macros or compiler options such as -std=c99 would otherwise
5248 disable some of those declarations.
5250 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5251 conflict with POSIX. The libbsd-compat library (which was a dummy library
5252 that did nothing) has also been removed.
5254 * Preliminary documentation about Multi-Thread, Async-Signal and
5255 Async-Cancel Safety has been added.
5257 * Change of ABI data structures for s390 and s390x:
5258 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5259 allow for future hardware extensions. All library functions that accept or
5260 return these structures were versioned in order to provide backwards
5261 compatibility with existing code. However, not all cases can be handled
5262 with interface versioning. If an application embeds either structure into
5263 another structure and that structure is passed to another compilation unit
5264 which expects the newer larger-sized object then any access to the new
5265 fields will result in undefined behaviour. Similarly any access to fields
5266 that were moved by the enlarging of the structures will cause undefined
5267 behaviour. To fix the undefined behaviour all objects that are part of the
5268 final in-memory image must agree on the size of structures, and this may
5269 require recompilation.
5273 * The following bugs are resolved with this release:
5275 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5276 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5277 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5278 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5279 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5280 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5281 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5282 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5283 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5284 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5285 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5286 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5287 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5290 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5291 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5292 Distributions can re-enable building and using pt_chown via the new configure
5293 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5294 considerable security risks and should only be used if the distribution
5295 understands and accepts the risks.
5297 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5300 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5301 fixed (Bugzilla #15330).
5303 * Add support for calling C++11 thread_local object destructors on thread
5304 and program exit. This needs compiler support for offloading C++11
5305 destructor calls to glibc.
5307 * Improved worst case performance of libm functions with double inputs and
5310 * Support for priority inherited mutexes in pthread condition variables on
5311 non-x86 architectures.
5313 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5315 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5317 * Optimized string functions for ARM. Implemented by Will Newton and
5320 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5322 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5325 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5326 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5328 * Added a benchmark framework to track performance of functions in glibc.
5330 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5331 It is based on draft TS 18661 and currently enabled as a GNU extension.
5333 * On Linux, the clock function now uses the clock_gettime system call
5334 for improved precision, rather than old times system call.
5336 * Added support for version-3 tz format files. This is needed when using
5337 the tz database release 2013e or later, and affects a few unusual cases --
5338 currently only TZ='America/Godthab' for time stamps after 2037.
5340 * Added new API functions pthread_getattr_default_np and
5341 pthread_setattr_default_np to get and set the default pthread
5342 attributes of a process.
5344 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5345 This may improve lock scaling of existing programs on TSX capable systems.
5346 When the --enable-lock-elision=yes parameter is specified at configure
5347 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5350 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5351 availability). Implemented by Ryan S. Arnold.
5353 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5357 * The following bugs are resolved with this release:
5359 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5360 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5361 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5362 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5363 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5364 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5365 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5366 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5367 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5368 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5369 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5370 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5371 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5372 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5373 14879, 14889, 14893, 14898, 14914.
5375 * Optimization of memcpy for MIPS.
5377 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5378 EMFILE has been fixed (Bugzilla #14889).
5380 * The add-on ports collection is now distributed in the "ports" subdirectory
5381 of the main GNU C Library distribution, rather than separately.
5383 * Port to ARM AArch64 contributed by Linaro.
5385 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5386 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5388 Implemented by Andreas Krebbel.
5390 * The new function secure_getenv allows secure access to the environment,
5391 returning NULL if running in a SUID/SGID process. This function replaces
5392 the internal function __secure_getenv.
5394 * SystemTap static probes have been added into the dynamic linker.
5395 Implemented by Gary Benson.
5397 * Optimizations of string functions strstr, strcasestr and memmem.
5398 Implemented by Maxim Kuvyrkov.
5400 * The minimum Linux kernel version that this version of the GNU C Library
5401 can be used with is 2.6.16.
5403 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5404 powerpc POWER7. Implemented by Will Schmidt.
5406 * New configure option --disable-nscd builds the C library such that it
5407 never attempts to contact the Name Service Caching Daemon (nscd).
5408 New configure option --disable-build-nscd avoids building nscd itself;
5409 this is the default if --disable-nscd is used.
5411 * Improved support for cross-compilation, including cross-testing and
5412 bootstrap builds without a previously built glibc.
5414 * Several testsuite tests are now able to test multiple IFUNC variants of an
5415 interface, rather than just testing the one that would be chooen by
5418 * New configure options --with-bugurl and --with-pkgversion, for
5419 distributors to use to embed their bug-reporting and package version
5420 information in --help and --version output.
5422 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5423 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5424 allows creation of chroots without the procfs mounted on /proc.
5426 * The `crypt' function now fails if passed salt bytes that violate the
5427 specification for those values. On Linux, the `crypt' function will
5428 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5429 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5430 when the mode is enabled.
5432 * The `clock_*' suite of functions (declared in <time.h>) is now available
5433 directly in the main C library. Previously it was necessary to link with
5434 -lrt to use these functions. This change has the effect that a
5435 single-threaded program that uses a function such as `clock_gettime' (and
5436 is not linked with -lrt) will no longer implicitly load the pthreads
5437 library at runtime and so will not suffer the overheads associated with
5438 multi-thread support in other code such as the C++ runtime library.
5440 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5445 * The following bugs are resolved with this release:
5447 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5448 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5449 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5450 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5451 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5452 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5453 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5454 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5455 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5456 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5457 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5458 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5459 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5460 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5461 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5462 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5463 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5464 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5465 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5466 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5467 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5468 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5471 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5472 configuring glibc with:
5473 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5474 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5475 Implemented by H.J. Lu.
5479 + define static_assert
5481 + do not declare gets
5483 + declare at_quick_exit and quick_exit also for ISO C11
5485 + aligned_alloc. NB: The code is deliberately allows the size parameter
5486 to not be a multiple of the alignment. This is a moronic requirement
5487 in the standard but it is only a requirement on the caller, not the
5490 + timespec_get added
5492 + uchar.h support added
5494 + CMPLX, CMPLXF, CMPLXL added
5496 Implemented by Ulrich Drepper.
5498 * Support for the IA-64 has been moved to ports.
5500 * Remove support for anything but ELF binary format
5502 * Checking versions of poll, ppoll added.
5503 Implemented by Ulrich Drepper.
5505 * More generic and 64-bit performance optimizations to math functions.
5506 Implemented by Ulrich Drepper.
5508 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5509 headers and functions available at compile time as they were before
5510 version 2.14. This option will be removed at some time in the future
5511 after the TI-RPC library becomes fully sufficient for the needs of
5512 existing applications.
5514 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5515 Note that glibc is not expected to work with any Linux kernel version
5518 * New header <sys/auxv.h> and function getauxval allowing easy access to
5519 the AT_* key-value pairs passed from the Linux kernel. The header also
5520 defines the HWCAP_* bits associated with the AT_HWCAP key.
5522 * New locales: mag_IN
5524 * New configure option --enable-systemtap builds SystemTap static probes
5525 into libc for setjmp and longjmp and into libpthread for various operations.
5526 So far the setjmp/longjmp probes and some of the libpthread probes are
5527 provided only for i*86 and x86_64.
5528 Implemented by Roland McGrath and Rayson Ho.
5530 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5532 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5535 * More optimized functions for SPARC. Implemented by David S. Miller.
5537 * Improved support for cross-compilation, especially bootstrap builds
5538 without a previously built glibc.
5540 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5541 Chris Metcalf from Tilera.
5543 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5544 now supported for ARM processors.
5546 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5547 as the name of the dynamic linker, to distinguish it from the
5548 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5550 * Support for CRIS has been removed from ports.
5552 * A new class of installed header has been documented for low-level
5553 platform-specific functionality. PowerPC added the first instance with a
5554 function to provide time base register access. Contributed by Tulio
5555 Magno Quites Machado Filho.
5557 * ix86 configurations now install header files that are consistent with
5558 what x86-64 configurations install. These same header files can be used
5559 for -m32, -m64, or -mx32 builds.
5560 Contributed by H.J. Lu.
5562 * Math library bug fixes. A thorough audit of all open math library bugs was
5563 conducted by Joseph Myers. Significant progress was made on many math
5564 library bugs resulting in more accurate exceptions and function results.
5565 Many thanks to all those that contributed including Andreas Jaeger for his
5566 patch review and work on the x87 trigonometric instruction issues.
5568 * Timezone data is no longer installed. Timezone-related binaries and scripts
5569 will continue to be installed. Users should obtain their timezone data from
5570 their distribution provider or from the tzdata package at
5571 <ftp://munnari.oz.au/pub/>.
5575 * The following bugs are resolved with this release:
5577 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5578 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5579 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5580 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5581 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5582 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5583 13484, 13506, 13515, 13523, 13524, 13538, 13540
5585 * New program pldd to list loaded object of a process
5586 Implemented by Ulrich Drepper.
5588 * Add nss_db support back to glibc. No more dependency on Berkeley db
5589 and support for initgroups lookups.
5590 Implemented by Ulrich Drepper.
5592 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5593 Contributed by HJ Lu.
5595 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5596 Contributed by HJ Lu.
5598 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5599 on x86-32 and x86-64.
5600 Contributed by Liubov Dmitrieva.
5602 * Optimized strchr and strrchr for SSE on x86-32.
5603 Contributed by Liubov Dmitrieva.
5605 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5606 for x86-64 and x86-32.
5607 Contributed by Liubov Dmitrieva.
5609 * New interfaces: scandirat, scandirat64
5610 Implemented by Ulrich Drepper.
5612 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5613 Implemented by Ulrich Drepper.
5615 * nscd now also caches the netgroup database.
5616 Implemented by Ulrich Drepper.
5618 * Integrate libm with gcc's -ffinite-math-only option.
5619 Implemented by Ulrich Drepper.
5621 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5622 to math functions. Implemented by Ulrich Drepper.
5624 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5625 Implemented by Ulrich Drepper.
5627 * New Linux interfaces: process_vm_readv, process_vm_writev
5629 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5630 Implemented by Ulrich Drepper.
5632 * Optimized nearbyint and strcasecmp for PPC.
5633 Implemented by Adhemerval Zanella.
5635 * New locales: bho_IN, unm_US, es_CU, ta_LK
5639 * The following bugs are resolved with this release:
5641 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5642 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5643 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5644 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5645 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5646 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5647 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5648 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5649 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5650 12795, 12811, 12813, 12814, 12841
5652 * The RPC implementation in libc is obsoleted. Old programs keep working
5653 but new programs cannot be linked with the routines in libc anymore.
5654 Programs in need of RPC functionality must be linked against TI-RPC.
5655 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5657 Visible changes of this change include (obviously) the inability to link
5658 programs using RPC functions without referencing the TI-RPC library and the
5659 removal of the RPC headers from the glibc headers.
5660 Implemented by Ulrich Drepper.
5662 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5663 syncfs, setns, sendmmsg
5665 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5666 yue_HK, lij_IT, mhr_RU
5668 * New encodings: CP770, CP771, CP772, CP773, CP774
5670 * New program sotruss to trace calls through PLTs
5671 Implemented by Ulrich Drepper.
5673 * The malloc hook implementation is marked deprecated and will be removed
5674 from the default implementation in the next version. The design never
5675 worked ever since the introduction of threads. Even programs which do
5676 not create threads themselves can use multiple threads created internally.
5680 * The following bugs are resolved with this release:
5682 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5683 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5684 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5685 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5688 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5690 * POWER7 optimizations: memset, memcmp, strncmp
5692 * New optimized string functions for x86-64: strnlen (SSE2),
5693 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5694 Implemented by Ulrich Drepper.
5698 * The following bugs are resolved with this release:
5700 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5701 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5702 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5703 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5704 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5705 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5706 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5707 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5709 * New interfaces: pthread_getname_np, pthread_setname_np
5711 * New Linux interface: recvmmsg
5713 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5715 * The dynamic linker now recognizes supported ABI versions from the
5716 EI_ABIVERSION field in the ELF header.
5717 Implemented by Ulrich Drepper.
5719 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5720 will not be used to fill in password fields in the passwd.byname replies.
5721 Instead it is used to synthesize the shadow.byname table, should it be
5722 missing. This is a useful mode in some installations involving Solaris.
5723 Implemented by Ulrich Drepper.
5725 * New locales: kok_IN, sq_MK, cv_RU
5729 * The following bugs are resolved with this release:
5731 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5732 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5733 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5734 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5735 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5736 10789, 10817, 10823, 10840, 10847
5738 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5740 Implemented by Ulrich Drepper.
5742 * Checking version of longjmp added that fails if an uninitialized stack
5743 frame would be created. Implemented by Ulrich Drepper.
5745 * STT_GNU_IFUNC is now supported in static executables.
5746 Implemented by H.J. Lu.
5748 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5750 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5751 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5752 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5753 Contributed by H.J. Lu.
5755 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5756 Implemented by Ulrich Drepper.
5758 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5760 Contributed by H.J. Lu.
5762 * Support for fma instruction in AVX on x86-64.
5763 Implemented by H.J. Lu and Ulrich Drepper.
5765 * AVX support in x86-64 auditing support in ld.so.
5766 Implemented by H.J. Lu.
5768 * STB_GNU_UNIQUE support added.
5769 Implemented by Ulrich Drepper.
5771 * Implement second fallback mode for optimized DNS lookup for even more
5772 broken environments. If two requests from the same port are not
5773 handled correctly close the socket and open a new one before sending
5774 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5775 can be used to select this mode right away, instead of rediscovering the
5776 necessity is every process again.
5777 Implemented by Ulrich Drepper.
5779 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5780 Implemented by Adam Tkac.
5782 * Optimized iconv conversions for S390x.
5783 Implemented by Andreas Krebbel.
5785 * Using condvars with PI mutexes is now more efficient due to kernel
5786 support for requeueing to PI futexes. NPTL support added for x86-64.
5787 Implemented by Ulrich Drepper.
5789 * New locales: ps_AF, my_MM
5793 * The following bugs are resolved with this release:
5795 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5796 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5797 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5798 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5799 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5801 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5802 Implemented by Ulrich Drepper.
5804 * New Linux interfaces: accept4, fallocate, fallocate64.
5805 Implemented by Ulrich Drepper.
5807 * Correct declarations of string function when used in C++ code. This
5808 could lead to compile errors for invalid C++ code.
5810 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5813 * New POSIX 2008 interface: psiginfo
5814 Implemented by Ulrich Drepper.
5816 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5817 Implemented by Ulrich Drepper.
5819 * Support for selecting between multiple function definitions at runtime
5820 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5822 * The libcrypt library can now use the hash function implementations in
5823 NSS. Implemented by Ulrich Drepper.
5825 * The malloc implementation can be compiled to be less memory efficient
5826 but higher performing in multi-threaded programs.
5827 Implemented by Ulrich Drepper.
5829 * New locales: nan_TW@latin, ks_IN
5831 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5832 Implemented by Ulrich Drepper.
5834 * Extended printf hook support. It is possible to use user-defined types
5835 and extend existing format specifiers.
5836 Implemented by Ulrich Drepper.
5838 * Handling for group shadow files has been added.
5839 Implemented by Ulrich Drepper.
5841 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5842 servers (the case, e.g., for some people using the built-in DNS
5843 server in ADSL modems/routers). There is a once-per-process timeout
5844 in case of a broken server. To avoid it, users can run nscd or put
5845 'options single-request' in /etc/resolv.conf.
5846 Implemented by Ulrich Drepper.
5850 * The following bugs are resolved with this release:
5852 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5853 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5854 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5855 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5856 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5858 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5859 up at the same time. Implemented by Ulrich Drepper.
5861 * TLS descriptors for LD and GD on x86 and x86-64.
5862 Implemented by Alexandre Oliva.
5864 * getaddrinfo now handles DCCP and UDPlite.
5865 Implemented by Ulrich Drepper.
5867 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5868 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5869 Implemented by Ulrich Drepper.
5871 * New implementation of memmem, strstr, and strcasestr which is O(n).
5872 Implemented by Eric Blake.
5874 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5876 * Implement "e" option for popen to open file descriptor with the
5877 close-on-exec flag set. Implemented by Ulrich Drepper.
5879 * Implement "b" mode for fmemopen. In this mode writes writes don't
5880 implicitly add a NUL byte and seeks from the end of the buffer really
5881 use the buffer end, not the string length as the basis.
5882 Implemented by Ulrich Drepper.
5884 * Many functions, exported and internal, now atomically set the close-on-exec
5885 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5887 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5889 Implemented by Pravin Satpute.
5891 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5895 * The following bugs are resolved with this release:
5897 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5898 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5899 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5900 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5901 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5902 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5903 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5905 * New locales: bo_CN, bo_IN, shs_CA.
5907 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5909 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5910 Implemented by Pravin Satpute.
5912 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5914 * nscd caches now all timeouts for DNS entries
5915 Implemented by Ulrich Drepper.
5917 * nscd is more efficient and wakes up less often.
5918 Implemented by Ulrich Drepper.
5920 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5921 vdprintf, and obstack_vprintf.
5922 Implemented by Jakub Jelinek.
5924 * Faster memset for x86-64.
5925 Implemented by Harsha Jagasia and H.J. Lu.
5927 * Faster memcpy on x86.
5928 Implemented by Ulrich Drepper.
5930 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5931 Implemented by Ulrich Drepper.
5933 * Faster sqrt and sqrtf implementation for some PPC variants.
5934 Implemented by Steven Munroe.
5938 * The following bugs are resolved with this release:
5940 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5941 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5942 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5943 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5944 5071, 5103, 5104, 5112, 5113, 5184, 5186
5946 * More checking functions: fread, fread_unlocked, open*, mq_open.
5947 Implemented by Jakub Jelinek and Ulrich Drepper.
5949 * Extend fortification to C++. Implemented by Jakub Jelinek.
5951 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5952 by not recognizing 'a' as a modifier when those specs are requested.
5953 Implemented by Jakub Jelinek.
5955 * PPC optimizations to math and string functions.
5956 Implemented by Steven Munroe.
5958 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5959 options to be passed. Implemented by Ulrich Drepper.
5961 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5963 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5964 Implemented by Ulrich Drepper.
5966 * Handle private futexes in the NPTL implementation.
5967 Implemented by Jakub Jelinek and Ulrich Drepper.
5969 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5970 Implemented by Roland McGrath and Ulrich Drepper.
5972 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5974 * SHA-256 and SHA-512 based password encryption.
5975 Implemented by Ulrich Drepper.
5977 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5978 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5981 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5982 Implemented by Ulrich Drepper.
5986 * The following bugs are resolved with this release:
5988 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5989 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5990 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5991 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5992 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5993 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5994 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5997 * New Linux interfaces: epoll_pwait, sched_getcpu.
5999 * New generic interfaces: strerror_l.
6001 * nscd can now cache the services database. Implemented by Ulrich Drepper.
6005 * The following bugs are resolved with this release:
6007 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
6008 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6009 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6010 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6011 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6012 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6013 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6014 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6015 3225, 3251, 3252, 3253, 3273
6017 * For Linux, the sorting of addresses returned by getaddrinfo now also
6018 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6019 Implemented by Ulrich Drepper.
6021 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6022 Implemented by Ulrich Drepper.
6024 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6026 * New iconv module for MIK. Contributed by Alexander Shopov.
6028 * For sites with broken group and/or passwd database, the auto-propagate
6029 option of nscd can prevent creating ID lookup entries from the results
6030 of a name lookup and vice versa. This usually is no problem but some
6031 site might have problems with the default behavior.
6032 Implemented by Ulrich Drepper.
6034 * Iterating over entire database in NIS can be slow. With the
6035 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6036 to trade time for memory. The entire database will be read at once.
6037 Implemented by Ulrich Drepper.
6039 * The interfaces introduced in RFC 3542 have been implemented by
6042 * Support for the new ELF hash table format was added by Ulrich Drepper.
6044 * Support for priority inheritance mutexes added by Jakub Jelinek and
6047 * Support for priority protected mutexes added by Jakub Jelinek.
6049 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6050 or_IN, csb_PL, fy_NL, sr_ME.
6054 * More overflow detection functions.
6056 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6057 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6059 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6060 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6061 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6062 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6063 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6064 by Masahide Washizawa.
6066 * It is now possible to install audit libraries for the dynamic linker using
6067 LD_AUDIT. Implemented by Ulrich Drepper.
6069 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6070 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6071 For a libc and libpthread that works well on Linux 2.4 kernels, we
6072 recommend using the stable 2.3 branch.
6074 * The new function open_wmemstream acts like open_memstream,
6075 but uses a wchar_t wide character buffer.
6077 * The new function ppoll is an improved version of poll, similar to pselect.
6079 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6080 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6081 renameat, unlinkat, linkat, symlinkat, readlinkat.
6083 * New Linux kernel system calls: unshare,
6084 inotify_init, inotify_add_watch, inotify_rm_watch.
6086 * The euidaccess function is now also known by the alias eaccess,
6087 for compatibility with some other systems.
6089 * Timezone data updated to 2006b version.
6093 * The following bugs are resolved with this release:
6095 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6096 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6097 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6098 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6099 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6100 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6102 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6104 * As of this release, GCC 4 can be used to compile the C Library.
6106 * Timezone data updated to 2005m version.
6110 * The following bugs are resolved with this release:
6112 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6113 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6114 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6115 777, 787, 821, 822, 823, 825
6117 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6121 * Support for RFC 3678. Real implementations exist only for Linux so far.
6122 Implemented by Ulrich Drepper.
6124 * nscd can now cache entries persistently. Expiring entries are reloaded.
6125 For speedups the cache can be shared in memory with client processes.
6126 Implemented by Ulrich Drepper.
6128 * nscd can now perform SELinux checks.
6129 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6131 * getaddrinfo queries are now cached. Canonical name lookup is performed
6133 Implemented by Ulrich Drepper.
6135 * The nothrow function attribute is used when headers are used by gcc when
6136 compiling C code. This can avoid significant amounts of exception
6139 * The malloc functions perform more error checking and are stricter when
6140 it comes to reacting on errors. The default action is to terminate
6141 the process after showing an error message. Implemented by Ulrich Drepper.
6143 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6144 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6146 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6147 namespaces using the new function dlmopen(). This feature is of course,
6148 like most other dynamic loading functionality, not available in statically
6149 linked applications. Implemented by Ulrich Drepper.
6151 * Low-overhead boundary checking variants of string and some stdio functions
6152 were added. These are to be used in conjunction with a gcc patch by
6153 Jakub Jelinek which adds calls to these functions if possible.
6154 Implemented by Jakub Jelinek and Ulrich Drepper.
6156 * Old code for several operating systems and machine architectures that
6157 have not been in working condition in a long time have been removed from
6158 the main source tree maintained by the GNU C Library's maintainers.
6159 These files are now reside in the separate `ports' source module
6160 that is usable as an add-on when building the library.
6164 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6165 interrogate the dynamic linker, compatible with the Solaris interface.
6167 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6168 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6170 * getifaddrs now uses the netlink interface on Linux to get its information.
6171 Implemented by Thorsten Kukuk.
6173 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6174 Implemented by Ulrich Drepper.
6176 * support for non-executable stacks on x86 has been added. Changes mostly
6179 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6182 * getaddrinfo now performs destination address selection according to
6187 * Thread-safe interfaces for many functions that access locale data
6188 were added in version 2.3, but these features were omitted from NEWS.
6189 Many functions have variants with an `_l' suffix that take a `locale_t'
6190 object as a parameter rather than consulting the current locale.
6191 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6192 create and maintain `locale_t' objects. Additionally, the new function
6193 `uselocale' sets "the current locale" (as used by functions not so
6194 parameterized) set for an individual thread. These features were added
6195 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6197 * The functions getresuid, getresgid, setresuid, and setresgid, which
6198 have long been available on Linux, are now declared in <unistd.h>
6199 and are now also available on the Hurd.
6201 * ELF thread-local storage support (TLS) now works on x86-64.
6203 * The new dynamic string token $LIB is expanded in shared library names.
6204 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6206 * Aldy Hernandez contributed complete software floating point support for
6207 PowerPC machines with no FPU.
6209 * fexecve is implemented on Linux.
6211 * The `btowc' function should work at least twice as fast due to
6212 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6214 * With appropriate thread add-ons cancelable functions are now implemented
6215 in libc.so as well. No need to call the function in libpthread. This
6216 change allowed to finally disable the incorrect and expensive handling
6217 of weak definition in ld.so.
6219 * Yet more PLT entries in libc.so have been removed. We finally arrived
6220 at the bare minimum. Startup times improved appropriately.
6222 * Support for the new Linux/x86 system call interface was added. The
6223 AT_SYSINFO auxiliary vector entry is recognized and handled.
6227 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6230 * iconv (the program and the interface) now accepts empty names (excluding
6231 options like //TRANSLIT) to mean "use charset of current locale".
6233 * localedef can now transliterate characters in strings which are not in
6234 the provided charmap. The information from the input locale is used.
6236 * Prelinking support was added for ELF targets. This requires additional
6237 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6239 * Read-only stdio streams now use mmap to speed up operation by eliminating
6240 copying and buffer underflows. To use add 'm' to the mode string of
6241 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6243 * The malloc functions were completely rewritten by Wolfram Gloger based
6244 on Doug Lea's malloc-2.7.0.c.
6246 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6247 implementation of regex.
6249 * Bruno Haible upgraded the iconv and locale implementation to support
6252 * Contents of the LC_* and LANG environment variables in the CEN style are
6253 not recognized anymore. It never was used. Change by Ulrich Drepper.
6255 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6256 thread-local storage (TLS) ABI on some platforms.
6257 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6259 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6260 EUC-JISX0213, and TSCII.
6262 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6263 BSD-compatible interface for getting all network interface addresses.
6264 Implementation for IPv4 by Roland McGrath.
6266 * Loading of locale data is faster due to the introduction of a locale
6267 archive. Implemented by Roland McGrath and Ulrich Drepper.
6269 * Startup times are significantly reduced by not using exported functions
6270 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6273 * Steven Munroe contributed a port to PowerPC64/Linux.
6277 * The Hurd now uses the GNU libio implementation of stdio rather than the
6278 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6280 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6281 with the same behavior as the Linux system call of the same name.
6285 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6286 128-bit long double format.
6288 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6289 IBM1161, and IBM1162 charsets.
6291 * Andreas Jaeger contributed a port to x86-64/Linux.
6293 * Peter Bruin contributed a port to PowerPC/Hurd.
6295 * libc functions using I/O streams now can handle wide-oriented streams
6298 * optimizations in the dynamic linker. Binaries created by recent binutils
6299 versions start up quicker due to reduced time spent on relocations.
6301 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6305 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6306 asinh, atanh, j0 for the 128-bit long double format.
6308 * Bruno Haible updated all the code handling Unicode in some form to
6309 support Unicode 3.1.
6311 * Speed of regex for single-byte locales is back to previous levels.
6312 Patch by Isamu Hasegawa.
6314 * Alpha, SPARC, and IA-64 now also using floating stacks.
6316 * Startup time of internationalized applications greatly improved through
6317 iconv cache. Use iconvconfig to generate the cache file.
6318 Contributed by Ulrich Drepper.
6320 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6321 severe performance problems. Patch by David Mosberger.
6323 * The Hurd port got a lot more functionality like AIO, various stdio
6324 extensions, etc. Mainly done by Roland McGrath.
6326 * mtrace can now lookup symbols in shared libraries.
6330 * Intel's IA-64 math library is largely integrated. It provides fast and
6331 accurate implementatations for most basic and standard math functions
6332 in float, double, and long double format.
6334 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6335 and asin for the 96-bit long double format and asin, log, tan for the
6336 128-bit long double format.
6338 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6339 The basic double functions exist today. Contributed by Abraham Ziv
6340 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6341 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6343 * An asynchronous name lookup library was added. The interface is designed
6344 after POSIX AIO. The proposal was circulated beforehand to get comments.
6345 No negative ones came in. Implemented by Ulrich Drepper.
6347 * Port to S390/64bit contributed by Martin Schwidefsky
6348 <schwidefsky@de.ibm.com>.
6350 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6351 of functions for Linux/IA-64.
6353 * The RPC code is now thread safe. Threads can now use the same service
6354 of different services at the same time. Patch by Eric Norum
6355 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6357 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6358 family of functions for Linux/S390.
6360 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6361 of functions for Linux/x86.
6363 * Port to Linux/CRIS contributed by Axis Communications.
6367 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6368 we can now check for namespace violations and missing declarations. The
6369 result is that almost all headers are now Unix-compliant (as defined in
6370 the upcoming XPG6). The negative side is that some programs might need
6371 corrections, too, if they depend on the incorrect form of the headers in
6372 previous versions which defined too many symbols and included too many
6375 * regex now handles multibyte character sets correctly.
6376 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6378 * iconv (the program) does now conform to the upcoming XPG6 and handles
6379 charmaps. Instead of the charset names the path of charmaps can be
6380 provided and the conversion happens based on this data.
6381 Contributed by Ulrich Drepper.
6383 * The locale program now provides detailed information about the installed
6388 only lists the names of the supported locales
6392 provides details such as country, language, and codeset name.
6393 Contributed by Ulrich Drepper.
6397 * The gencat program now parses the input file according to the charset
6398 selected by the LC_CTYPE category. This is important for stateful
6399 character sets. To make generating catalogs easier there is a way
6400 to overwrite the charset selected by the locale: before the first
6401 message or $ quote line the catalog can contain a line like
6403 $ codeset=ISO-8859-2
6405 to select the charset (ISO-8859-2 in this case).
6407 Implemented by Shinya Hanataka and Ulrich Drepper.
6409 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6410 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6411 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6413 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6414 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6416 * The LANGUAGE environment variable is now ignored unless the locale is
6417 changed from the default "C" locale.
6419 * The usual bug fixes.
6423 * Greg McGary added runtime support for bounds checking using gcc's
6424 new -fbounded-pointers option. ix86 target is complete. PowerPC
6427 * Thorsten Kukuk added secure mode support to nscd.
6429 * The Berkeley db libraries have been removed.
6431 Related, the nss_db module is now in a separate package since it
6432 obviously requires a database library being available.
6434 * Wide character I/O streams implemented by Ulrich Drepper.
6436 * Functions from the extended socket API added by Ulrich Drepper.
6438 * Functions feenableexcept and fedisableexcept to control the
6439 behaviour of individual exceptions have been added by Andreas Jaeger.
6441 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6443 * The resolver code has been updated from bind 8.2.3-T5B which supports
6444 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6447 This change could in some situations effect backward compatibility. Since
6448 now `_res' is a thread-local instead of a global variable, modifying it
6449 in one thread does not have any effect in other threads.
6451 The resolver library was also extended to allow IPv6 as the transport
6452 protocol for the requests. This work was done by Stig Venaas.
6454 * Compatibility code for K&R C compilers has been removed from the
6455 header files. A ISO C compiler is needed to use the library
6456 (conforming to either C89 or C99 standard).
6458 * Complete rewrite of the localedef program to support multibyte character
6459 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6460 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6461 Implemented by Ulrich Drepper.
6463 Bruno Haible significantly improved the generation and use of the data
6464 structures for the wide character tables.
6466 * Plural handling in gettext implemented by Ulrich Drepper.
6468 * The utmp daemon has been removed.
6470 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6472 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6475 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6477 * POSIX barriers implemented by Kaz Kylheku.
6479 * POSIX spawn function family implemented by Ulrich Drepper.
6481 * POSIX spinlocks are now available.
6483 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6485 * the configure option --enable-kernel=X.Y.Z allows to strip out
6486 compatibility for kernel versions before X.Y.Z. This is currently only
6487 implemented for Linux.
6489 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6490 field sin6_scope_id. This means that all programs using IPv6 should be
6491 recompiled. Don't expect binary compatibility with previous glibc
6494 * various conversion modules for IBM character sets contributed by
6497 * IA-64 port by Jes Sorensen and HJ Lu.
6511 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6513 * New xdr functions are added; some rpc functions are now 64bit clean.
6515 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6517 * Fixed known incompatibilities with glibc 2.0.
6519 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6521 * Optimized a number of functions (especially the ELF dynamic loader).
6523 * Update timezone data files.
6525 * lots of charmaps corrections
6527 * some new locale definitions and charmaps
6532 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6533 conform to POSIX member type requirements. Symbol versions have been
6534 adjusted as needed within the library, and for direct use by applications,
6535 but there is potential for problems if third-party libraries use
6536 struct timeval as part of their interface. This does not present
6537 a problem for X and other "essential" system libraries.
6539 * An additional locale model to support C++ Standard Library locale
6540 model and probably more was implemented by Ulrich Drepper.
6542 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6545 * Miles Bader provided the `argp' function family to support hierarchical
6546 command line argument parsing, layered on top of getopt.
6548 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6550 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6553 * scanf recognizes the %a and %A format for scanning floating point numbers.
6555 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6556 information and interfaces for the available integer types.
6558 * about 130 new math functions were added to implement the ISO C9x math
6561 * the new header <complex.h> contains definitions of the complex math
6562 functions from ISO C 9X.
6564 * the new header <tgmath.h> defines generic macros to use complex or
6565 real valued functions.
6567 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6569 * Andreas Jaeger provided a test suite for the math library.
6571 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6573 * Ulrich Drepper added character set conversion functions (iconv).
6575 * Optimized string functions have been added.
6577 * The localedata addon is now part of glibc.
6579 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6581 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6582 daemon for NSS (nscd).
6584 Missing a better place here are some numbers on improvements. Under
6585 Linux 2.1.125 un-tar-ing the kernel sources takes
6589 using local files 12.19s 6.88s 22.91s
6591 using NIS 13.92s 8.91s 26.34s
6593 using NIS & nscd 10.37s 7.34s 25.30s
6595 using NIS+ 27.57s 30.37s 640.46s
6597 using NIS+ & nscd 10.25s 7.83s 26.51s
6599 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6601 Keep in mind that non-namelookup related operations dominate above times.
6602 It was just a common complain that using NIS+ unpacking the kernel is
6605 [1] The old nscd implementation is not available anymore since it was
6606 distributed with glibc up to version 2.0.98 and thus is now replaced.
6608 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6610 * Mark Kettenis provided a Hesiod NSS module.
6612 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6613 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6615 * rcmd can now handle netgroups (Dick Streefland).
6617 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6620 * Support for the IPv6 protocol has been added to the socket API, as per the
6621 latest draft standards.
6623 * Support for Linux 2.2 has been added.
6625 * Interface changes relative to the latest 2.0.x release:
6626 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6627 addseverity NEW: Unix98
6628 alphasort64 NEW: LFS
6629 argp_err_exit_status NEW: argp, GNU ext
6630 argp_error NEW: argp, GNU ext
6631 argp_failure NEW: argp, GNU ext
6632 argp_help NEW: argp, GNU ext
6633 argp_parse NEW: argp, GNU ext
6634 argp_program_bug_address NEW: argp, GNU ext
6635 argp_program_version NEW: argp, GNU ext
6636 argp_program_version_hook NEW: argp, GNU ext
6637 argp_state_help NEW: argp, GNU ext
6638 argp_usage NEW: argp, GNU ext
6639 authdes_create NEW: Secure RPC
6640 authdes_getucred NEW: Secure RPC
6641 authdes_pk_create NEW: Secure RPC
6642 backtrace NEW: GNU ext.
6643 backtrace_symbols NEW: GNU ext.
6644 backtrace_symbols_fd NEW: GNU ext.
6646 cacosf NEW: ISO C 9x
6647 cacosh NEW: ISO C 9x
6648 cacoshf NEW: ISO C 9x
6649 cacoshl NEW: ISO C 9x
6650 cacosl NEW: ISO C 9x
6657 casinf NEW: ISO C 9x
6658 casinh NEW: ISO C 9x
6659 casinhf NEW: ISO C 9x
6660 casinhl NEW: ISO C 9x
6661 casinl NEW: ISO C 9x
6663 catanf NEW: ISO C 9x
6664 catanh NEW: ISO C 9x
6665 catanhf NEW: ISO C 9x
6666 catanhl NEW: ISO C 9x
6667 catanl NEW: ISO C 9x
6668 cbc_crypt NEW: Secure RPC
6672 ccoshf NEW: ISO C 9x
6673 ccoshl NEW: ISO C 9x
6679 cimagf NEW: ISO C 9x
6680 cimagl NEW: ISO C 9x
6681 clearerr_locked REMOVED
6682 clntunix_create NEW: sunrpc ext
6684 clog10 NEW: ISO C 9x
6685 clog10f NEW: ISO C 9x
6686 clog10l NEW: ISO C 9x
6696 cprojf NEW: ISO C 9x
6697 cprojl NEW: ISO C 9x
6699 crealf NEW: ISO C 9x
6700 creall NEW: ISO C 9x
6705 csinhf NEW: ISO C 9x
6706 csinhl NEW: ISO C 9x
6709 csqrtf NEW: ISO C 9x
6710 csqrtl NEW: ISO C 9x
6714 ctanhf NEW: ISO C 9x
6715 ctanhl NEW: ISO C 9x
6717 des_setparity NEW: Secure RPC
6718 ecb_crypt NEW: Secure RPC
6719 endutxent NEW: Unix98
6721 exp10f NEW: ISO C 9x
6722 exp10l NEW: ISO C 9x
6726 fattach NEW: STREAMS
6727 fdetach NEW: STREAMS
6731 feclearexcept NEW: ISO C 9x
6732 fegetenv NEW: ISO C 9x
6733 fegetexceptflag NEW: ISO C 9x
6734 fegetround NEW: ISO C 9x
6735 feholdexcept NEW: ISO C 9x
6737 feraiseexcept NEW: ISO C 9x
6738 ferror_locked REMOVED
6739 fesetenv NEW: ISO C 9x
6740 fesetexceptflag NEW: ISO C 9x
6741 fesetround NEW: ISO C 9x
6742 fetestexcept NEW: ISO C 9x
6743 feupdateenv NEW: ISO C 9x
6744 fflush_locked REMOVED
6748 fgets_unlocked NEW: GNU ext.
6749 fileno_locked REMOVED
6761 fputc_locked REMOVED
6762 fputs_unlocked NEW: GNU ext.
6763 fread_unlocked NEW: GNU ext.
6768 fstatvfs NEW: Unix98
6772 ftruncate64 NEW: LFS
6774 fwrite_unlocked NEW: GNU ext.
6775 gai_strerror NEW: IPv6
6779 getchar_locked REMOVED
6781 getdate_err NEW: Unix98
6782 getdate_r NEW: GNU ext.
6784 getnameinfo NEW: IPv6
6785 getnetname NEW: Secure RPC
6786 getpmsg NEW: STREAMS
6787 getpt NEW: Unix98 PTY
6788 getrlimit64 NEW: LFS
6789 getutxent NEW: Unix98
6790 getutxid NEW: Unix98
6791 getutxline NEW: Unix98
6792 glob64 NEW: GNU ext.
6793 globfree64 NEW: GNU ext.
6794 gnu_get_libc_release NEW: GNU ext.
6795 gnu_get_libc_version NEW: GNU ext.
6796 grantpt NEW: Unix98 PTY
6797 host2netname NEW: Secure RPC
6799 iconv_close NEW: iconv
6800 iconv_open NEW: iconv
6801 if_freenameindex NEW: IPv6
6802 if_indextoname NEW: IPv6
6803 if_nameindex NEW: IPv6
6804 if_nametoindex NEW: IPv6
6805 in6addr_any NEW: IPv6
6806 in6addr_loopback NEW: IPv6
6807 inet6_isipv4mapped NEW: IPv6
6808 isastream NEW: STREAMS
6809 iswblank NEW: GNU ext.
6810 key_decryptsession NEW: Secure RPC
6811 key_decryptsession_pk NEW: Secure RPC
6812 key_encryptsession NEW: Secure RPC
6813 key_encryptsession_pk NEW: Secure RPC
6814 key_gendes NEW: Secure RPC
6815 key_get_conv NEW: Secure RPC
6816 key_secretkey_is_set NEW: Secure RPC
6817 key_setnet NEW: Secure RPC
6818 key_setsecret NEW: Secure RPC
6819 llrint NEW: ISO C 9x
6820 llrintf NEW: ISO C 9x
6821 llrintl NEW: ISO C 9x
6822 llround NEW: ISO C 9x
6823 llroundf NEW: ISO C 9x
6824 llroundl NEW: ISO C 9x
6829 lrintf NEW: ISO C 9x
6830 lrintl NEW: ISO C 9x
6831 lround NEW: ISO C 9x
6832 lroundf NEW: ISO C 9x
6833 lroundl NEW: ISO C 9x
6835 makecontext NEW: Unix98
6836 mempcpy NEW: GNU ext.
6839 modify_ldt NEW: kernel
6843 nearbyint NEW: ISO C 9x
6844 nearbyintf NEW: ISO C 9x
6845 nearbyintl NEW: ISO C 9x
6846 netname2host NEW: Secure RPC
6847 netname2user NEW: Secure RPC
6848 nexttoward NEW: ISO C 9x
6849 nexttowardf NEW: ISO C 9x
6850 nexttowardl NEW: ISO C 9x
6854 passwd2des NEW: Secure RPC
6856 pow10f NEW: GNU ext.
6857 pow10l NEW: GNU ext.
6860 printf_size NEW: GNU ext.
6861 printf_size_info NEW: GNU ext.
6862 profil_counter REMOVED
6863 pthread_mutexattr_getkind_np REPLACED
6864 pthread_mutexattr_setkind_np REPLACED
6865 ptsname NEW: Unix98 PTY
6866 ptsname_r NEW: Unix98 PTY
6868 putchar_locked REMOVED
6869 putgrent NEW: GNU ext.
6871 putpmsg NEW: STREAMS
6872 pututxline NEW: Unix98
6876 readdir64_r NEW: LFS
6877 remquo NEW: ISO C 9x
6878 remquof NEW: ISO C 9x
6879 remquol NEW: ISO C 9x
6881 roundf NEW: ISO C 9x
6882 roundl NEW: ISO C 9x
6884 scalbln NEW: ISO C 9x
6885 scalblnf NEW: ISO C 9x
6886 scalblnl NEW: ISO C 9x
6888 sendfile NEW: kernel
6889 setcontext NEW: Unix98
6890 setrlimit64 NEW: LFS
6891 setutxent NEW: Unix98
6893 sigignore NEW: Unix98
6894 sigqueue NEW: POSIX.1b
6895 sigrelse NEW: Unix98
6896 sigset NEW: POSIX.1b
6897 sigtimedwait NEW: POSIX.1b
6898 sigwaitinfo NEW: POSIX.1b
6899 sincos NEW: GNU ext.
6900 sincosf NEW: GNU ext.
6901 sincosl NEW: GNU ext.
6905 strcasestr NEW: GNU ext.
6906 strtoimax NEW: ISO C 9x
6907 strtoumax NEW: ISO C 9x
6908 strverscmp NEW: GNU ext.
6909 svcauthdes_stats NEW: Secure RPC
6910 svcunix_create NEW: sunrpc etx
6911 svcunixfd_create NEW: sunrpc ext
6912 swapcontext NEW: Unix98
6913 tcgetsid NEW: Unix98 PTY
6914 tdestroy NEW: GNU ext.
6915 tgamma NEW: ISO C 9x
6916 tgammaf NEW: ISO C 9x
6917 tgammal NEW: ISO C 9x
6921 truncf NEW: ISO C 9x
6922 truncl NEW: ISO C 9x
6924 unlockpt NEW: Unix98 PTY
6925 updwtmpx NEW: Unix98
6926 user2netname NEW: Secure RPC
6927 utmpxname NEW: Unix98
6928 versionsort NEW: GNU ext.
6929 versionsort64 NEW: GNU ext.
6931 wcscasecmp NEW: GNU ext.
6932 wcsncasecmp NEW: GNU ext.
6933 wcsnlen NEW: GNU ext.
6934 wcstoimax NEW: ISO C 9x
6935 wcstoll NEW: ISO C 9x
6936 wcstoull NEW: ISO C 9x
6937 wcstoumax NEW: ISO C 9x
6939 wordexp NEW: POSIX.2
6940 wordfree NEW: POSIX.2
6941 write_profiling REMOVED
6942 xdecrypt NEW: Secure RPC
6943 xdr_authdes_cred NEW: Secure RPC
6944 xdr_authdes_verf NEW: Secure RPC
6945 xdr_cryptkeyarg NEW: Secure RPC
6946 xdr_cryptkeyarg2 NEW: Secure RPC
6947 xdr_cryptkeyres NEW: Secure RPC
6948 xdr_getcredres NEW: Secure RPC
6949 xdr_key_netstarg NEW: Secure RPC
6950 xdr_key_netstres NEW: Secure RPC
6951 xdr_keybuf NEW: Secure RPC
6952 xdr_keystatus NEW: Secure RPC
6953 xdr_netnamestr NEW: Secure RPC
6954 xdr_sizeof NEW: Secure RPC
6955 xdr_unixcred NEW: sunrpc ext
6956 xencrypt NEW: Secure RPC
6957 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6968 * inet_ntoa is thread-safe
6970 * updwtmp is moved from libutil to libc
6972 * rewrite of cbrt function
6974 * update of timezone data
6988 * add atoll function
6990 * fix complex problems in Berkeley DB code
6992 * fix math functions
6996 * fixed lots of header problems (especially Linux/GNU specific)
6998 * dynamic loader preserves all registers
7000 * Roland McGrath provided support for handling of auxiliary objects in
7001 the ELF dynamic loader.
7003 * support for parallel builds is improved
7007 * GNU extensions are no longer declared by default. To enable them you
7008 must define the macro `_GNU_SOURCE' in your program or compile with
7011 * The library has changed from using GNU ld symbol aliases to using weak
7012 symbols where available. The ELF object file format supports weak
7013 symbols; GNU ld also supports weak symbols in the a.out format. (There
7014 is also now support for other GNU ld extensions in ELF. Use the
7015 `--with-elf' option to configure to indicate you have ELF, and
7016 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7017 of many files which contained only symbol aliases, reducing the size of
7018 the source and the compiled library; many other files were renamed to
7019 less cryptic names previously occupied by the symbol alias files.
7020 There is a new header file <elf.h> for programs which operate on
7021 files in the ELF format.
7023 * Converted to Autoconf version 2, so `configure' has more options.
7024 Run `configure --help' to see the details.
7026 * The library can now be configured to build profiling, highly-optimized
7027 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7028 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7029 `configure' enable building these extra libraries. The shared library is
7030 built by default when using both ELF and GNU ld. When shared libraries
7031 are enabled, the new library `-ldl' is available for arbitrary run-time
7032 loading of shared objects; its interface is defined in <dlfcn.h>. The
7033 new header file <link.h> gives access to the internals of the run-time
7034 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7035 application of same name on other systems and it provides information
7036 about dynamically linked binaries.
7038 * The C library now provides the run-time support code for profiling
7039 executables compiled with `-pg'. Programs can control the profiling code
7040 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7041 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7042 the support for this file format was contributed by David Mosberger-Tang.
7044 * The math code has been replaced with a math library based on fdlibm from
7045 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7046 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7047 functions. The math functions now reside in a separate library, so
7048 programs using them will need to use `-lm' their linking commands.
7050 * John C. Bowman contributed optimized ix87 assembler inline functions.
7052 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7053 mechanism similar to that found in Solaris 2. This is now used for the
7054 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7055 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7056 file controls what services are used for each individual database. This
7057 works by loading shared libraries with names specified in `nsswitch.conf',
7058 so service modules can be changed or added at any time without even
7059 relinking any program. Currently there are the file, db, and NIS based
7060 NSS services available.
7062 * The new functions `strtoq' and `strtouq' parse integer values from
7063 strings, like `strtol' and `strtoul', but they return `long long int' and
7064 `unsigned long long int' values, respectively (64-bit quantities).
7066 * The new functions `strtof' and `strtold' parse floating-point values from
7067 strings, like `strtod', but they return `float' and `long double' values,
7068 respectively (on some machines `double' and `long double' are the same).
7070 * Ulrich Drepper has contributed new implementations of the floating-point
7071 printing and reading code used in the `printf' family of functions and
7072 `strtod', `strtof', and `strtold'. These new functions are perfectly
7073 accurate, and much faster than the old ones.
7075 * The implementation of the POSIX locale model was completely rewritten by
7076 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7077 to compile the POSIX locale definition.
7079 * The former dummy implementations of the strcoll and strxfrm function are
7080 now replaced by fully functional code contributed by Ulrich Drepper. The
7081 collation information comes from the POSIX locale definitions.
7083 * The new header <langinfo.h> defines an interface for accessing
7084 various locale-dependent data (using the locale chosen with `setlocale').
7086 * Ulrich Drepper has contributed a new suite of functions for operation on
7087 wide-character and multibyte-character strings, in <wchar.h>;
7088 and classification and case conversion of wide characters, in <wctype.h>.
7089 These new functions are conforming to the ISO C, Amendment 1 specification.
7091 * There is now a second implementation of the standard I/O library available.
7092 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7093 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7095 * You can now use positional parameter specifications in format strings
7096 for the `printf' and `scanf' families of functions. For example,
7097 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7098 ``Number 6, Mr Jones''. This is mainly useful when providing different
7099 format strings for different languages, whose grammars may dictate
7100 different orderings of the values being printed. To support this
7101 feature, the interface for `register_printf_handler' has changed; see
7102 the header file <printf.h> for details.
7104 * The `printf' and `scanf' families of functions now understand a new
7105 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7106 to group numbers as indicated by the locale; for `scanf' and friends, this
7107 says to accept as valid only a number with all the proper grouping
7108 separators in the right places. In the default "C" locale, numbers are
7109 not grouped; but locales for specific countries will define the usual
7110 conventions (i.e. separate thousands with `,' in the US locale).
7112 * The pgrp functions have been regularized, slightly incompatibly but much
7113 less confusingly. The core functions are now `getpgid' and `setpgid',
7114 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7115 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7116 provided for compatibility. There is no longer an incompatible `getpgrp'
7117 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7119 * The new header file <fts.h> and suite of functions simplify programs that
7120 operate on directory trees. This code comes from 4.4 BSD.
7122 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7123 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7124 NSS scheme used in glibc.
7126 * There is a new malloc debugging hook `__memalign_hook'.
7128 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7129 `unsigned int' in <sys/types.h>. These are for compatibility only and
7130 their use is discouraged.
7132 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7133 done differently, so that it works even without GNU ld.
7135 * New function `euidaccess' checks allowed access to a file like `access',
7136 but using the effective IDs instead of the real IDs.
7138 * The time zone data files have been updated for the latest and greatest
7139 local time conventions of the countries of the world.
7141 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7144 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7145 for formatting floating-point numbers. They are provided only for
7146 compatibility; new programs should use `sprintf' instead. There are
7147 also equivalent function for the `long double' floating-point type and
7148 all functions also exist in a reentrant form.
7150 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7151 functions for maintaining the login-record files (primarily of use to
7152 system programs such as `login'), and convenient functions for
7153 allocating and initializing a pseudo-terminal (pty) device.
7155 * Ulrich Drepper has contributed new support for System V style
7156 shared memory and IPC on systems that support it.
7158 * Ulrich Drepper has contributed several miscellaneous new functions found
7159 in System V: The `hsearch' family of functions provide an effective
7160 implementation of hash tables; `a64l' and `l64a' provide a very simple
7161 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7164 * Ulrich Drepper has contributed new reentrant counterparts for the
7165 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7167 * Ulrich Drepper has contributed new, highly-optimized versions of several
7168 string functions for the i486/Pentium family of processors.
7170 * Ulrich Drepper has updated the Linux-specific code, based largely
7171 on work done in Hongjiu Lu's version of GNU libc for Linux.
7172 The GNU library now supports Linux versions 2.0.10 and later,
7173 using the ELF object file format (i[3456]86-*-linux).
7175 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7177 * David Mosberger-Tang and Richard Henderson have ported the C library
7178 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7179 dynamic linking support for ELF/Alpha.
7181 * Richard Henderson contributed several Alpha optimized assembler function
7182 for arithmetic and string handling.
7184 * Ulrich Drepper has contributed a new set of message catalog functions to
7185 support multiple languages using the <libintl.h> interface, for use with
7186 his new package GNU gettext. Translation volunteers have contributed
7187 catalogs of the library's messages in Spanish, German, and Korean.
7189 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7190 program and the `catgets' function for reading the catalog files it
7191 creates. (The <libintl.h> interface is preferred; we include the
7192 <nl_types.h> interface using `catgets' only for source compatibility with
7193 programs already written to use it.)
7195 * New header file <values.h> gives SVID-compatible names for <limits.h>
7198 * Various new macros, declarations, and small header files for compatibility
7201 * New function `group_member' is a convenient way to check if a process has
7202 a given effective group ID.
7204 * When using GCC 2.7 and later, the socket functions are now declared in a
7205 special way so that passing an argument of type `struct sockaddr_in *',
7206 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7207 `struct sockaddr *' type, does not generate a type-clash warning.
7209 * New function `error' declared in header file <error.h> is a convenient
7210 function for printing error messages and optionally exiting; this is the
7211 canonical function used in GNU programs. The new functions `err', `warn',
7212 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7213 doing the same thing.
7215 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7216 POSIX.2 `glob' function to do ~ and {...} expansion.
7218 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7219 `clearenv' which is used in POSIX.9 is also available.
7221 * New function `getsid' returns session ID number on systems that support it.
7223 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7224 files <db.h> and <mpool.h> provide a rich set of functions for several
7225 types of simple databases stored in memory and in files, and <ndbm.h> is
7226 an old `ndbm'-compatible interface using the `db' functions. Link with
7227 `-ldb' to get these functions.
7229 * New macro `strdupa' copies a string like `strdup', but uses local stack
7230 space from `alloca' instead of dynamic heap space from `malloc'.
7232 * New function `strnlen' is like `strlen' but searches only a given maximum
7233 number of characters for the null terminator. `stpncpy', `strndup' and
7234 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7237 * New function `statfs' in header <sys/statfs.h>.
7239 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7240 provide convenient functions for operating on blocks of null-terminated
7243 * A new suite of functions in <utmp.h> handle all the details of reading
7244 and writing the utmp file.
7246 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7249 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7250 completely POSIX compliant and also implemented the extended functionality
7251 to handle alternate digit representation and alternate era date formats.
7253 * Ulrich Drepper provided an implementation of the `strptime' function
7254 defined in XPG4.2 which transforms a string into a `struct tm' value.
7256 * Paul Eggert provided the tzselect shell script as part of the timezone
7257 code. The shell script makes it easy to select the correct timezone
7260 * The implementation of the malloc family of functions is completely replaced
7261 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7262 The implementation uses the mmap function (if available) and it is
7263 optimized for the use in multi threaded programs.
7265 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7266 functions. This new functionality is usable by specifying a special
7267 salt string and it is compatible with implementation on *BSD systems.
7269 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7270 `getsubopt' to handle second level command line options, `bsd_signal'
7271 to access BSD style `signal' functionality, the obsolete `regexp' style
7274 * the `lchown' function is available on system which support this
7277 * The implementation of the shadow password handling function was contributed
7280 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7282 * POSIX.1g support was added. The <sys/select.h> header is available,
7283 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7284 implementation of `getaddrinfo'.
7288 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7290 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7291 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7293 * The new function `daemon' from 4.4 BSD is useful for server programs that
7294 want to put themselves in the background.
7296 * Joel Sherrill has contributed support for several standalone boards that
7297 run without an operating system.
7299 * `printf', `scanf' and friends now accept a `q' type modifier for long
7300 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7302 * All of the code taken from BSD (notably most of the math and networking
7303 routines) has been updated from the BSD 4.4-Lite release.
7305 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7307 * The new functions `getdomainname' and `setdomainname' fetch or change the
7308 YP/NIS domain name. These are system calls which exist on systems which
7311 * The time zone data files have been updated for the latest international
7314 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7315 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7319 * The C library now includes support for Sun RPC, from Sun's free
7320 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7321 are included. (There is still no support for YP.)
7323 * Tom Quinn has contributed a port of the C library to SGI machines running
7324 Irix 4 (mips-sgi-irix4).
7326 * The new `lockf' function is a simplified interface to the locking
7327 facilities of `fcntl', included for compatibility.
7329 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7331 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7333 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7336 * The error message printed by `assert' for a failed assertion now includes
7337 the name of the program (if using GNU ld) and the name of the calling
7338 function (with versions of GCC that support this).
7340 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7342 * The library now includes the <sys/mman.h> header file and memory
7343 management functions `mmap', `munmap', `mprotect', `msync', and
7344 `madvise', on systems that support those facilities.
7346 * The interface for `mcheck' has changed slightly: the function called to
7347 abort the program when an allocation inconsistency is detected now takes
7348 an argument that indicates the type of failure. The new function
7349 `mprobe' lets you request a consistency check for a particular block at
7350 any time (checks are normally done only when you call `free' or `realloc'
7353 * It is now possible to easily cross-compile the C library, building on one
7354 system a library to run on another machine and/or operating system. All
7355 you need to do is set the variable `HOST_CC' in `configparms' to the
7356 native compiler for programs to run on the machine you are building on (a
7357 few generator programs are used on Unix systems); set `CC' to the
7360 * The new function `fexecve' (only implemented on the GNU system) executes
7361 a program file given a file descriptor already open on the file.
7365 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7366 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7368 * You can set the variable `libprefix' in `configparms' to specify a prefix
7369 to be prepended to installed library files; this makes it easy to install
7370 the GNU C library to be linked as `-lgnuc' or whatever.
7372 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7373 copies a limited number of characters from a string, and returns the
7374 address of the last character written.
7376 * You no longer need to check for whether the installed `stddef.h' is
7377 compatible with the GNU C library. configure now checks for you.
7379 * You can now define a per-stream `fileno' function to convert the
7380 stream's cookie into an integral file descriptor.
7382 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7383 allocates zero bytes of storage, and returns a unique pointer which
7384 you can pass to `realloc' or `free'. The behavior is undefined if
7385 you dereference this pointer.
7387 * The C library now runs on Sony NEWS m68k machines running either
7388 NewsOS 3 or NewsOS 4.
7390 * The new `syscall' function is a system-dependent primitive function
7391 for invoking system calls. It has the canonical behavior on Unix
7392 systems, including unreliable return values for some calls (such as
7393 `pipe', `fork' and `getppid').
7395 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7396 to `EAGAIN', which is the preferred name. On systems whose kernels
7397 use two distinct codes, the C library now translates EWOULDBLOCK to
7398 EAGAIN in every system call function.
7402 * The GNU C Library Reference Manual is now distributed with the library.
7403 `make dvi' will produce a DVI file of the printed manual.
7404 `make info' will produce Info files that you can read on line using C-h i
7405 in Emacs or the `info' program.
7406 Please send comments on the manual to bug-glibc-manual@gnu.org.
7408 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7410 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7412 * Jason Merrill has contributed a port to the Sequent Symmetry running
7413 Dynix version 3 (i386-sequent-dynix).
7415 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7416 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7418 * New function `memory_warnings' lets you arrange to get warnings when
7419 malloc is running out of memory to allocate, like Emacs gives you.
7421 * The C library now contains the relocating allocator used in Emacs 19 for
7422 its editing buffers. This allocator (ralloc) minimizes allocation
7423 overhead and fragmentation by moving allocated regions around whenever it
7424 needs to. You always refer to a ralloc'd region with a "handle" (a
7425 pointer to a pointer--an object of type `void **').
7427 * There is a new `printf' format: `%m' gives you the string corresponding
7428 to the error code in `errno'.
7430 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7431 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7432 pass, the `a' modifier says to fill in a `char **' you pass with a
7435 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7436 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7437 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7439 * `mkstemp' is a traditional Unix function to atomically create and open a
7440 uniquely-named temporary file.
7444 * The standard location for the file that says what the local timezone is
7445 has changed again. It is now `/usr/local/etc/localtime' (or more
7446 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7448 * The distribution no longer contains any files with names longer than 14
7451 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7452 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7454 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7458 * The configuration process has changed quite a bit. The `configure'
7459 script is now used just like the configuration scripts for other GNU
7460 packages. The `sysdeps' directory hierarchy is much rearranged.
7461 The file `INSTALL' explains the new scheme in detail.
7463 * The header files no longer need to be processed into ANSI C and
7464 traditional C versions. There is just one set of files to install, and
7465 it will work with ANSI or old C compilers (including `gcc -traditional').
7467 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7468 MIPS DECStation running Ultrix 4.
7470 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7471 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7472 made itself into a shared library.
7474 * Yet further improved support for the i386, running 4.3 BSD-like systems
7475 (such as Mach 3 with the Unix single-server), or System V.
7477 * New function `strncasecmp' to do case-insensitive string comparison
7478 with limited length.
7480 * New function `strsep' is a reentrant alternative to `strtok'.
7482 * New functions `scandir' and `alphasort' for searching directories.
7484 * New function `setenv' is a better interface to `putenv'.
7486 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7487 function for traversing a directory tree.
7489 * The GNU obstack package is now also part of the C library.
7490 The new function `open_obstack_stream' creates a stdio stream that
7491 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7492 formatted output directly to an obstack.
7494 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7495 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7497 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7499 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7500 things to your strings.
7502 * There are some new test programs: test-fseek, testmb, and testrand.
7504 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7505 These ports are not finished, but are a good starting place for really
7506 supporting those systems.
7508 * `/etc/localtime' is now the standard location for the file that says what
7509 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7510 This follows the general principle that `/etc' is the place for all local
7511 configuration files.
7513 * The C library header files now use `extern "C"' when used by the C++
7514 compiler, so the C library should now work with C++ code.
7516 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7517 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7520 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7521 function which uses the `merge sort' algorithm, and is said to be
7522 significantly faster than the old GNU `qsort' function. Merge sort is
7523 now the standard `qsort' function. The new algorithm can require a lot
7524 of temporary storage; so, the old sorting function is called when the
7525 required storage is not available.
7527 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7528 provides the Unix `crypt' function, plus some other entry points.
7530 * The code and header files taken from 4.4 BSD have been updated with the
7531 latest files released from Berkeley.
7533 ----------------------------------------------------------------------
7536 Permission is granted to anyone to make or distribute verbatim copies
7537 of this document as received, in any medium, provided that the
7538 copyright notice and this permission notice are preserved,
7539 thus giving the recipient permission to redistribute in turn.
7541 Permission is granted to distribute modified versions
7542 of this document, or of portions of it,
7543 under the above conditions, provided also that they
7544 carry prominent notices stating who last changed them.
7547 version-control: never