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 The following bugs are resolved with this release:
53 [The release manager will add the list generated by
54 scripts/list-fixed-bugs.py just before the release.]
60 * When C2X features are enabled and the base argument is 0 or 2, the
61 following functions support binary integers prefixed by 0b or 0B as
62 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
63 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
64 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
65 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
66 following functions support binary integers prefixed by 0b or 0B as
67 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
68 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf; those
69 functions also support the %b format for binary integers, with or
70 without such a prefix and independent of standards mode.
72 * PRIb*, PRIB* and SCNb* macros from C2X have been added to
75 * printf-family functions now support the wN format length modifiers for
76 arguments of type intN_t, int_leastN_t, uintN_t or uint_leastN_t (for
77 example, %w32d to print int32_t or int_least32_t in decimal, or %w32x
78 to print uint32_t or uint_least32_t in hexadecimal) and the wfN format
79 length modifiers for arguments of type int_fastN_t or uint_fastN_t, as
80 specified in draft ISO C2X.
82 * A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
83 Transparent Huge Pages (THP) in stack allocation at pthread_create.
85 * Support for x86_64 running on Hurd has been added. This port requires
86 as least binutils 2.40 and GCC 13:
90 * Vector math library libmvec support has been added to AArch64. It
91 requires GCC version >= 10.1.0. It can be disabled via
92 "--disable-mathvec", however that is not a supported configuration as
93 it changes the ABI. The symbol names follow the AArch64 vector ABI,
94 they are declared in math.h and have to be called manually at this point.
96 * The strlcpy and strlcat functions have been added. They are derived
97 from OpenBSD, and are expected to be added to a future POSIX version.
99 * A new configure option, "--enable-fortify-source", can be used to build the
100 GNU C Library with _FORTIFY_SOURCE. The level of fortification can either be
101 provided, or is set to the highest value supported by the compiler. If not
102 explicitly enabled, then fortify source is forcibly disabled so to keep
103 original behavior unchanged.
105 Deprecated and removed features, and other changes affecting compatibility:
107 * libcrypt is no longer built by default; one may use the "--enable-crypt"
108 option to build libcrypt. libcrypt is likely to be removed from the
109 GNU C Library in a future release, so it is recommended that
110 applications port away from it to an alternative such as libxcrypt.
112 * In the Linux kernel for the hppa/parisc architecture some of the
113 MADV_XXX constants were changed to have the same values as the other
114 architectures. New programs compiled with this glibc version and which
115 use the madvise call will require at least Linux kernel version 6.2,
116 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
117 5.4.228, 4.19.270 or 4.14.303.
119 * The "--disable-experimental-malloc" option is no longer available. The
120 per-thread cache can still be disabled per-application using tunables
121 (glibc.malloc.tcache_count set to zero).
123 * The configure option "--enable-tunables" has been removed. The tunable
124 feature is now always enabled.
126 Changes to build and runtime requirements:
128 * Building libmvec on AArch64 requires at a minimum GCC 10.1.0 for SVE
131 Security related changes:
133 CVE-2023-25139: When the printf family of functions is called with a
134 format specifier that uses an <apostrophe> (enable grouping) and a
135 minimum width specifier, the resulting output could be larger than
136 reasonably expected by a caller that computed a tight bound on the
137 buffer size. The resulting larger than expected output could result
138 in a buffer overflow in the printf family of functions.
140 The following bugs are resolved with this release:
142 [178] string: Please add strlcpy and strlcat (attached)
143 [14697] nptl: Behavior of exit is nonconformant with respect to
145 [15142] stdio: Missing locking in _IO_cleanup
146 [18096] glob: null deref in wordexp/parse_dollars/parse_arith
147 [18906] stdio: fopen: ccs value may affect open mode
148 [24466] stdio: Feature request: provide special printf formats for
150 [25457] nss: hosts lookup fails for ipv4mapped ipv6 addresses
151 [28519] libc: system and popen should pass "--" between /bin/sh and
153 [29016] stdio: popen() sets errno to ENOMEM when shell does not exist
154 [29591] string: wcsnlen length can overflow in page cross case.
155 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
156 [30068] stdio: incorrect printf output for integers with thousands
157 separator and width field (CVE-2023-25139)
158 [30111] time: support_descriptors_list fails after 2038 on 32 bits
160 [30125] dynamic-link: [regression, bisected] glibc-2.37 creates new
161 symlink for libraries without soname
162 [30130] math: [s390] The _FPU_SETCW macro yields compile error with
164 [30156] time: Potential ntp_gettime abi break
165 [30235] libc: Missing fallback in getlogin if loginuid is unset
166 [30258] dynamic-link: sprof cannot read and display shared object
167 profiling data correctly
168 [30263] libc: Add test coverage for abs(), labs(), and llabs().
169 [30305] math: Incorrect asm constraint in feraiseexcept on x86-64
170 [30402] libc: FAIL: elf/tst-glibcelf
171 [30425] dynamic-link: Symbol lookup during dlclose may fail
173 [30435] dynamic-link: Root dir wrongly marked as nonexist in open_path
174 [30477] libc: [RISCV]: time64 does not work on riscv32
175 [30515] dynamic-link: _dl_find_object incorrectly returns 1 during
177 [30527] network: resolv_conf lock not unlocked on allocation failure
178 [30550] math: powerpc64le: GCC-specific code for isinf() is being used
180 [30555] string: strerror can incorrectly return NULL
181 [30579] malloc: trim_threshold in realloc lead to high memory usage
182 [30662] nscd: Group and password cache use errno in place of errval
188 * The getent tool now supports the --no-addrconfig option. The output of
189 getent with --no-addrconfig may contain addresses of families not
190 configured on the current host i.e. as-if you had not passed
191 AI_ADDRCONFIG to getaddrinfo calls.
193 Deprecated and removed features, and other changes affecting compatibility:
195 * The dynamic linker no longer loads shared objects from the "tls"
196 subdirectories on the library search path or the subdirectory that
197 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
198 search mechanism, which was deprecated in version 2.33.
200 Security related changes:
202 CVE-2022-39046: When the syslog function is passed a crafted input
203 string larger than 1024 bytes, it reads uninitialized memory from the
204 heap and prints it to the target log file, potentially revealing a
205 portion of the contents of the heap.
207 The following bugs are resolved with this release:
209 [12154] network: Cannot resolve hosts which have wildcard aliases
210 [12165] libc: readdir: Do not skip entries with zero d_ino values
211 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
212 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
213 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
214 AF_INET6 address (ie docker)
215 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
217 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
218 [28937] dynamic-link: New DSO dependency sorter does not put new map
220 [29249] libc: csu/libc-tls.c:202: undefined reference to
221 `_startup_fatal_not_constant'
222 [29305] network: Inefficient buffer space usage in nss_dns for
223 gethostbyname and other functions
224 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
225 [29402] nscd: nscd: No such file or directory
226 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
228 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
229 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
231 [29463] math: math/test-float128-y1 fails on x86_64
232 [29485] build: Make hangs when the test misc/tst-pidfile returns
234 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
236 [29499] build: Check failed on misc/tst-glibcsyscalls while building
237 for RISCV64 on a unmatched hardware
238 [29501] build: Check failed on stdlib/tst-strfrom while building for
239 RISCV64 on a unmatched hardware
240 [29502] libc: alpha sys/acct.h out of date
241 [29514] build: Need to use -fPIE not -fpie
242 [29528] dynamic-link: __libc_early_init not called after dlmopen that
244 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
245 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
247 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
249 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
251 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
252 [29576] build: librtld.os: in function `_dl_start_profile':
253 (.text+0x9444): undefined reference to `strcpy'
254 [29578] libc: Definition of SUN_LEN() is wrong
255 [29583] build: iconv failures on 32bit platform due to missing large
257 [29600] dynamic-link: dlmopen hangs after loading certain libraries
258 [29604] localedata: Update locale data to Unicode 15.0.0
259 [29605] nscd: Regression in NSCD backend of getaddrinfo
260 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
262 [29611] string: Optimized AVX2 string functions unconditionally use
264 [29624] malloc: errno is not cleared when entering main
265 [29638] libc: stdlib: arc4random fallback is never used
266 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
268 [29698] build: Configuring for AArch32 on ARMv8+ disables
270 [29727] locale: __strtol_internal out-of-bounds read when parsing
272 [29730] libc: broken y2038 support in fstatat on MIPS N64
273 [29746] libc: ppoll() does not switch to __ppoll64 when
274 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
275 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
276 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
277 aux.S: No such file or directory)
278 [29864] libc: __libc_start_main() should obtain program headers
279 address (_dl_phdr) from the auxv, not the ELF header.
280 [29951] time: daylight variable not set correctly if last DST change
281 coincides with offset change
282 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
283 length in fortify mode
289 * Support for DT_RELR relative relocation format has been added to
290 glibc. This is a new ELF dynamic tag that improves the size of
291 relative relocations in shared object files and position independent
292 executables (PIE). DT_RELR generation requires linker support for
293 -z pack-relative-relocs option, which is supported for some targets
294 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
296 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
297 have been added. The pidfd functionality provides access to a process
298 while avoiding the issue of PID reuse on traditional Unix systems.
300 * On Linux, the process_madvise function has been added. It has the
301 same functionality as madvise but alters the target process identified
304 * On Linux, the process_mrelease function has been added. It allows a
305 caller to release the memory of a dying process. The release of the
306 memory is carried out in the context of the caller, using the caller's
307 CPU affinity, and priority with CPU usage accounted to the caller.
309 * The “no-aaaa” DNS stub resolver option has been added. System
310 administrators can use it to suppress AAAA queries made by the stub
311 resolver, including AAAA lookups triggered by NSS-based interfaces
312 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
313 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
314 produce IPv6 addresses, and configured IPv6 name servers are still
315 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
316 are translated to A queries. The new resolver option is intended
317 primarily for diagnostic purposes, to rule out that AAAA DNS queries
318 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
319 validation by applications.
321 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
322 and mount_setattr have been added. They are part of the new Linux kernel
323 mount APIs that allow applications to more flexibly configure and operate
324 on filesystem mounts. The new mount APIs are specifically designed to work
327 * localedef now accepts locale definition files encoded in UTF-8.
328 Previously, input bytes not within the ASCII range resulted in
329 unpredictable output.
331 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
332 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
333 Support for the char8_t typedef has been added per the ISO C2X N2653
334 proposal. The functions are declared in uchar.h in C2X mode or when the
335 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
336 The char8_t typedef is declared in uchar.h in C2X mode or when the
337 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
338 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
340 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
341 added. The functions wrap getrandom and/or /dev/urandom to return high-
342 quality randomness from the kernel.
344 * Support for LoongArch running on Linux has been added. This port requires
345 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
348 - loongarch64-linux-gnu
350 The LoongArch ABI is 64-bit little-endian.
352 Deprecated and removed features, and other changes affecting compatibility:
354 * Support for prelink will be removed in the next release; this includes
355 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
356 variables and their functionality in the dynamic loader.
358 * The Linux kernel version check has been removed along with the
359 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
360 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
361 when libc.so is issued directly.
363 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
365 The following bugs are resolved with this release:
367 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
368 return different result with versioned "foo"
369 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
371 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
372 ./exe and ld.so adjusts argv on the stack
373 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
375 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
376 consuming the second byte of certain double byte characters
377 [25812] stdio: Libio vtable protection is sometimes only partially
379 [27054] libc: pthread_atfork handlers that call pthread_atfork
381 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
383 [28128] build: declare_symbol_alias doesn't work for assembly codes
384 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
385 [28752] nss: Segfault in getpwuid when stat fails
386 [28815] libc: realpath should not copy to resolved buffer on error
387 [28828] stdio: fputwc crashes
388 [28838] libc: FAIL: elf/tst-p_align3
389 [28845] locale: ld-monetary.c should be updated to match ISO C and
391 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
393 [28852] libc: getaddrinfo leaks memory with AI_ALL
394 [28853] libc: tst-spawn6 changes current foreground process group
395 (breaks test isolation)
396 [28857] libc: FAIL: elf/tst-audit24a
397 [28860] build: --enable-kernel=5.1.0 build fails because of missing
398 __convert_scm_timestamps
399 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
400 inaccurate without /sys and /proc
401 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
403 [28880] libc: Program crashes if date beyond 2038
404 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
405 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
406 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
407 rtm variants when avoiding overflow
408 [28922] build: The .d dependency files aren't always generated
409 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
411 [28936] build: nm: No such file
412 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
413 [28953] nss: NSS lookup result can be incorrect if function lookup
415 [28970] math: benchtest: libmvec benchmark doesn't build with make
417 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
418 /sys/devices/system/cpu/possible
419 [28993] libc: closefrom() iterates until max int if no access to
421 [28996] libc: realpath fails to copy partial result to resolved buffer
423 [29027] math: [ia64] fabs fails with sNAN input
424 [29029] nptl: poll() spuriously returns EINTR during thread
425 cancellation and with cancellation disabled
426 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
427 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
428 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
429 is promoted to global scope
430 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
431 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
432 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
434 [29097] time: fchmodat does not handle 64 bit time_t for
436 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
438 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
439 [29162] string: [PATCH] string.h syntactic error:
440 include/bits/string_fortified.h:110: error: expected ',' or ';'
441 before '__fortified_attr_access'
442 [29165] libc: [Regression] broken argv adjustment
443 [29187] dynamic-link: [regression] broken argv adjustment for nios2
444 [29193] math: sincos produces a different output than sin/cos
445 [29197] string: __strncpy_power9() uses uninitialised register vs18
446 value for filling after \0
447 [29203] libc: daemon is not y2038 aware
448 [29204] libc: getusershell is not 2038 aware
449 [29207] libc: posix_fallocate fallback implementation is not y2038
451 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
452 [29209] libc: isfdtype is not y2038 aware
453 [29210] network: ruserpass is not y2038 aware
454 [29211] libc: __open_catalog is not y2038 aware
455 [29213] libc: gconv_parseconfdir is not y2038 aware
456 [29214] nptl: pthread_setcanceltype fails to set type
457 [29225] network: Mistyped define statement in socket/sys/socket.h in
459 [29274] nptl: __read_chk is not a cancellation point
460 [29279] libc: undefined reference to `mbstowcs_chk' after
461 464d189b9622932a75302290625de84931656ec0
462 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
463 correct for !__ASSUME_TIME64_SYSCALLS
464 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
465 missing on microblaze with largefile
471 * Unicode 14.0.0 Support: Character encoding, character type info, and
472 transliteration tables are all updated to Unicode 14.0.0, using
473 generator scripts contributed by Mike FABIAN (Red Hat).
475 * Bump r_version in the debugger interface to 2 and add a new field,
476 r_next, support multiple namespaces.
478 * Support for the C.UTF-8 locale has been added to glibc. The locale
479 supports full code-point sorting for all valid Unicode code points. A
480 limitation in the framework for fnmatch, regexec, and regcomp requires
481 a compromise to save space and only ASCII-based range expressions are
482 supported for now (see bug 28255). The full size of the locale is
483 only ~400KiB, with 346KiB coming from LC_CTYPE information for
484 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
485 in various downstream distributions. The locale is not built into
486 glibc, and must be installed.
488 * <math.h> functions that round their results to a narrower type, and
489 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
490 18661-3:2015 and draft ISO C2X:
492 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
493 fMxsqrtfN and fMxsqrtfNx functions.
495 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
498 * <math.h> functions for floating-point maximum and minimum,
499 corresponding to new operations in IEEE 754-2019, and corresponding
500 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
501 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
502 fminimum_mag, fminimum_mag_num and corresponding functions for float,
503 long double, _FloatN and _FloatNx.
505 * <math.h> macros for single-precision float constants are added as a
506 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
507 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
510 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
511 predefined as specified in TS 18661-1:2014.
513 * The exp10 functions in <math.h> now have a corresponding type-generic
516 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
518 * printf-family functions now support the %b format for output of
519 integers in binary, as specified in draft ISO C2X, and the %B variant
520 of that format recommended by draft ISO C2X.
522 * A new DSO sorting algorithm has been added in the dynamic linker that uses
523 topological sorting by depth-first search (DFS), solving performance issues
524 of the existing sorting algorithm when encountering particular circular
525 object dependency cases.
527 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
528 the two DSO sorting algorithms. The default setting of '2' uses the
529 new DFS-based algorithm. The setting '1' switches to the old
530 algorithm used in glibc 2.33 and earlier.
532 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
533 to be used by compilers for optimizing usage of 'memcmp' when its
534 return value is only used for its boolean status.
536 * Support for automatically registering threads with the Linux rseq
537 system call has been added. This system call is implemented starting
538 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
539 operations on per-cpu data. It allows user-space to perform updates
540 on per-cpu data without requiring heavy-weight atomic operations.
541 Automatically registering threads allows all libraries, including
542 libc, to make immediate use of the rseq support by using the
543 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
544 variables. The GNU C Library manual has details on integration of
545 Restartable Sequences.
547 * A symbolic link to the dynamic linker is now installed under
548 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
550 * All programs and the testsuite in glibc are now built as position independent
551 executables (PIE) by default on toolchains and architectures that support it.
552 Further, if the toolchain and architecture supports it, even static programs
553 are built as PIE and the resultant glibc can be used to build static PIE
554 executables. A new option --disable-default-pie has been added to disable
555 this behavior and get a non-PIE build. This option replaces
556 --enable-static-pie, which no longer has any effect on the build
559 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
560 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
561 or to use huge pages directly with mmap calls with the MAP_HUGETLB
562 flags). The former can improve performance when Transparent Huge Pages
563 is set to 'madvise' mode while the latter uses the system reserved
566 * The printf family of functions now handles the flagged %#m conversion
567 specifier, printing errno as an error constant (similar to strerrorname_np).
569 * The function _dl_find_object has been added. In-process unwinders
570 can use it to efficiently locate unwinding information for a code
573 * Support for OpenRISC running on Linux has been added. This port requires
574 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
579 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
580 64-bit file offsets (LFS default).
582 * A new configure option, --with-rtld-early-cflags, can be used to
583 specify additional compiler flags for building the early startup code
584 of the dynamic linker. On targets which have CPU compatibility
585 checks, this can help to ensure that proper diagnostics are printed if
586 the dynamic loader runs on an incompatible CPU.
588 * On Linux, the epoll_pwait2 function has been added. It is similar to
589 epoll_wait with the difference the timeout has nanoseconds resolution.
591 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
592 enabling posix_spawn and posix_spawnp to set the controlling terminal in
593 the new process in a race free manner. This function is a GNU extension.
595 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
596 applications compiling with glibc and gcc 12 and later. Level 3 leverages
597 the __builtin_dynamic_object_size function to deliver additional
598 fortification balanced against additional runtime cost (checking non-constant
601 * The audit libraries will avoid unnecessary slowdown if it is not required
602 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
604 Deprecated and removed features, and other changes affecting compatibility:
606 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
607 has been removed since the first PT_LOAD segment is no longer executable
608 due to defaulting to -z separate-code.
610 * The r_version update in the debugger interface makes the glibc binary
611 incompatible with GDB binaries built without the following commits:
613 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
614 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
616 when audit modules or dlmopen are used.
618 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
620 * The --enable-static-pie option is no longer available. The glibc build
621 configuration script now automatically detects static-pie support in the
622 toolchain and architecture and enables it if available.
624 * The catchsegv script and associated libSegFault.so shared object have
625 been removed. There are widely-deployed out-of-process alternatives for
626 catching coredumps and backtraces.
628 * Support for prelink will be removed in the next release; this includes
629 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
630 variables and their functionality in the dynamic loader.
632 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
633 functionality to obtain the program mapping address can be achieved by
634 using LD_TRACE_LOADED_OBJECTS to value of 2.
636 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
637 support prelink PIE binaries.
639 Changes to build and runtime requirements:
641 * The audit module interface version LAV_CURRENT is increased to enable
642 proper bind-now support. The loader now advertises via the la_symbind
643 flags that PLT trace is not possible. New audit modules require the
644 new dynamic loader supporting the latest LAV_CURRENT version. Old audit
645 modules are still loaded for all targets except aarch64.
647 * The audit interface on aarch64 is extended to support both the indirect
648 result location register (x8) and NEON Q register. Old audit modules are
649 rejected by the loader. Audit modules must be rebuilt to use the newer
650 structure sizes and the latest module interface version for LAV_CURRENT.
652 Security related changes:
654 CVE-2022-23219: Passing an overlong file name to the clnt_create
655 legacy function could result in a stack-based buffer overflow when
656 using the "unix" protocol. Reported by Martin Sebor.
658 CVE-2022-23218: Passing an overlong file name to the svcunix_create
659 legacy function could result in a stack-based buffer overflow.
661 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
662 function could result in a memory leak and potential access of
663 uninitialized memory. Reported by Qualys.
665 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
666 function may result in an off-by-one buffer underflow and overflow
667 when the current working directory is longer than PATH_MAX and also
668 corresponds to the / directory through an unprivileged mount
669 namespace. Reported by Qualys.
671 The following bugs are resolved with this release:
673 [12889] nptl: Race condition in pthread_kill
674 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
675 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
676 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
678 [15333] libc: Use 64-bit stat functions in installed programs
679 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
681 [15971] dynamic-link: No interface for debugger access to libraries
683 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
684 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
685 deeply nested DSO dependencies.
686 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
687 ID whose lifetime has not ended
688 [22542] network: buffer overflow in sunrpc clnt_create
690 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
692 [25947] malloc: memory leak in muntrace
693 [26045] math: fmaxf(inf, nan) does not always work
694 [26108] math: exp10() has problems with <tgmath.h>
695 [26779] build: benign use after realloc at localealias.c:329
696 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
697 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
698 [27945] build: build-many-glibcs.py doesn't configure GCC with
699 --enable-initfini-array
700 [27991] build: x86: sysdeps/x86/configure.ac breaks when
701 libc_cv_include_x86_isa_level is loaded from cache
702 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
703 in __REDIRECT_NTH macro
704 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
705 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
707 [28126] libc: nftw aborts for paths longer than PATH_MAX
708 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
709 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
711 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
712 [28185] math: Inaccurate j0f function (again)
713 [28199] locale: iconvconfig prefix flag behaves differently in glibc
715 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
716 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
718 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
719 [28223] libc: mips: clone does not align stack
720 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
722 [28256] malloc: Conditional jump or move depends on uninitialised
723 value(s) in __GI___tunables_init
724 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
725 spawn5 fail if stray fds are open
726 [28310] libc: Do not use affinity mask for sysconf
727 (_SC_NPROCESSORS_CONF)
728 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
730 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
732 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
733 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
735 [28353] network: Race condition on __opensock
736 [28357] dynamic-link: deadlock between pthread_create and ctors
737 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
738 [28361] nptl: Fix for bug 12889 causes setxid deadlock
739 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
740 [28390] localedata: Update locale data to Unicode 14.0.0
741 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
743 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
745 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
746 to tgkill (getpid (), gettid())
747 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
748 [28457] dynamic-link: Missing reldepmod4.so dependency for
750 [28469] time: linux: struct timex is not correctly set for 32-bit
751 systems with TIMESIZE=64
752 [28470] regex: Buffer read overrun in regular expression searching
753 [28475] string: Incorrect access attribute on memfrob
754 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
755 spurious NUL character on state reset
756 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
758 [28550] dynamic-link: FAIL: tst-dso-
759 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
761 [28554] build: Undefined generate-md5
762 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
764 [28607] nptl: Masked signals are delivered on thread exit
765 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
766 lack of cpu counting /proc fallback with glibc 2.34
767 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
768 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
769 [28648] dynamic-link: Running ld.so on statically linked binaries
771 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
773 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
774 [28678] nptl: nptl/tst-create1 hangs sporadically
775 [28688] dynamic-link: PT_LOAD p_align check is too strict
776 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
778 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
779 timezones generated by tzcode-2021d and later
780 [28713] math: GCC 12 miscompiles libm
781 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
782 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
783 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
784 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
785 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
786 Assertion `GL(dl_rtld_map).l_libname' failed!
787 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
788 [28757] nptl: GDB printer tests failed with new GDB
789 [28765] math: x86_64 libmvec atan2 accuracy
790 [28766] manual: Document libmvec accuracy
791 [28768] network: Buffer overflow in svcunix_create with long pathnames
793 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
795 [28770] libc: Unexpected return value from realpath() for too long
796 results (CVE-2021-3998)
797 [28771] libc: %ebx optimization macros are incompatible with .altmacro
799 [28780] build: --disable-default-pie doesn't work on static programs
800 [28782] libc: x86-64 ISA level for glibc itself is always
802 [28792] glob: possible wrong behaviour with patterns with double [
804 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
805 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
806 empty mon_decimal_point_wc
813 * In order to support smoother in-place-upgrades and to simplify
814 the implementation of the runtime all functionality formerly
815 implemented in the libraries libpthread, libdl, libutil, libanl has
816 been integrated into libc. New applications do not need to link with
817 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
818 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
819 provided, so that the linker options keep working. Applications which
820 have been linked against glibc 2.33 or earlier continue to load the
821 corresponding shared objects (which are now empty). The integration
822 of those libraries into libc means that additional symbols become
823 available by default. This can cause applications that contain weak
824 references to take unexpected code paths that would only have been
825 used in previous glibc versions when e.g. preloading libpthread.so.0,
826 potentially exposing application bugs.
828 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
829 PTHREAD_STACK_MIN is no longer constant and is redefined to
830 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
831 sets for modern architectural features like Arm SVE.
833 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
834 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
835 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
836 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
837 dynamic sized register sets for modern architectural features like
840 * The dynamic linker implements the --list-diagnostics option, printing
841 a dump of information related to IFUNC resolver operation and
842 glibc-hwcaps subdirectory selection.
844 * On Linux, the function execveat has been added. It operates similar to
845 execve and it is is already used to implement fexecve without requiring
846 /proc to be mounted. However, different than fexecve, if the syscall is not
847 supported by the kernel an error is returned instead of trying a fallback.
849 * The ISO C2X function timespec_getres has been added.
851 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
852 C2X, is supported to enable declarations of functions defined in Annex F
853 of C2X. Those declarations are also enabled when
854 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
855 defined, and when _GNU_SOURCE is defined.
857 * On powerpc64*, glibc can now be compiled without scv support using the
858 --disable-scv configure option.
860 * Add support for 64-bit time_t on configurations like x86 where time_t
861 is traditionally 32-bit. Although time_t still defaults to 32-bit on
862 these configurations, this default may change in future versions.
863 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
864 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
865 only enabled for Linux and the full support requires a minimum kernel
868 * The main gconv-modules file in glibc now contains only a small set of
869 essential converter modules and the rest have been moved into a supplementary
870 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
871 in the same GCONV_PATH. Similarly, external converter modules directories
872 may have supplementary configuration files in a gconv-modules.d directory
873 with names ending with .conf to logically classify the converter modules in
876 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
877 to configure the size of the thread stack cache.
879 * The function _Fork has been added as an async-signal-safe fork replacement
880 since Austin Group issue 62 dropped the async-signal-safe requirement for
881 fork (and it will be included in the future POSIX standard). The new _Fork
882 function does not run any atfork function neither resets any internal state
883 or lock (such as the malloc one), and only sets up a minimal state required
884 to call async-signal-safe functions (such as raise or execve). This function
885 is currently a GNU extension.
887 * On Linux, the close_range function has been added. It allows efficiently
888 closing a range of file descriptors on recent kernels (version 5.9).
890 * The function closefrom has been added. It closes all file descriptors
891 greater than or equal to a given integer. This function is a GNU extension,
892 although it is also present in other systems.
894 * The posix_spawn_file_actions_addclosefrom_np function has been added,
895 enabling posix_spawn and posix_spawnp to close all file descriptors greater
896 than or equal to a given integer. This function is a GNU extension,
897 although Solaris also provides a similar function.
899 * When invoked explicitly, the dynamic linker now uses the kernel to
900 execute programs that do not have any dynamic dependency (that is,
901 they are statically linked). This feature is Linux-specific.
903 Deprecated and removed features, and other changes affecting compatibility:
905 * The function pthread_mutex_consistent_np has been deprecated; programs
906 should use the equivalent standard function pthread_mutex_consistent
909 * The function pthread_mutexattr_getrobust_np has been deprecated;
910 programs should use the equivalent standard function
911 pthread_mutexattr_getrobust instead.
913 * The function pthread_mutexattr_setrobust_np has been deprecated;
914 programs should use the equivalent standard function
915 pthread_mutexattr_setrobust instead.
917 * The function pthread_yield has been deprecated; programs should use
918 the equivalent standard function sched_yield instead.
920 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
922 * Various rarely-used functions declared in <resolv.h> and
923 <arpa/nameser.h> have been deprecated. Applications are encouraged to
924 use dedicated DNS processing libraries if applicable. For <resolv.h>,
925 this affects the functions dn_count_labels, fp_nquery, fp_query,
926 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
927 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
928 p_type, putlong, putshort, res_hostalias, res_isourserver,
929 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
930 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
931 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
932 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
934 * Various symbols previously defined in libresolv have been moved to libc
935 in order to prepare for libresolv moving entirely into libc (see earlier
936 entry for merging libraries into libc). The symbols __dn_comp,
937 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
938 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
939 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
940 __res_search, __res_send formerly in libresolv have been renamed and no
941 longer have a __ prefix. They are now available in libc.
943 * The pthread cancellation handler is now installed with SA_RESTART and
944 pthread_cancel will always send the internal SIGCANCEL on a cancellation
945 request. It should not be visible to applications since the cancellation
946 handler should either act upon cancellation (if asynchronous cancellation
947 is enabled) or ignore the cancellation internal signal. However there are
948 buggy kernel interfaces (for instance some CIFS versions) that could still
949 see a spurious EINTR error when cancellation interrupts a blocking syscall.
951 * Previously, glibc installed its various shared objects under versioned
952 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
953 were provided as symbolic links. Starting with glibc 2.34, the shared
954 objects are installed under their ABI sonames directly, without
955 symbolic links. This increases compatibility with distribution
956 package managers that delete removed files late during the package
957 upgrade or downgrade process.
959 * The symbols mallwatch and tr_break are now deprecated and no longer used in
960 mtrace. Similar functionality can be achieved by using conditional
961 breakpoints within mtrace functions from within gdb.
963 * The __morecore and __after_morecore_hook malloc hooks and the default
964 implementation __default_morecore have been removed from the API. Existing
965 applications will continue to link against these symbols but the interfaces
966 no longer have any effect on malloc.
968 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
969 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
970 disabled by default in the main C library. Users looking to use these
971 features now need to preload a new debugging DSO libc_malloc_debug.so to get
972 this functionality back.
974 * The deprecated functions malloc_get_state and malloc_set_state have been
975 moved from the core C library into libc_malloc_debug.so. Legacy applications
976 that still use these functions will now need to preload libc_malloc_debug.so
977 in their environment using the LD_PRELOAD environment variable.
979 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
980 __memalign_hook and __free_hook are now removed from the API. Compatibility
981 symbols are present to support legacy programs but new applications can no
982 longer link to these symbols. These hooks no longer have any effect on glibc
983 functionality. The malloc debugging DSO libc_malloc_debug.so currently
984 supports hooks and can be preloaded to get this functionality back for older
985 programs. However this is a transitional measure and may be removed in a
986 future release of the GNU C Library. Users may port away from these hooks by
987 writing and preloading their own malloc interposition library.
989 Changes to build and runtime requirements:
991 * On Linux, the shm_open, sem_open, and related functions now expect the
992 file shared memory file system to be mounted at /dev/shm. These functions
993 no longer search among the system's mount points for a suitable
994 replacement if /dev/shm is not available.
996 Security related changes:
998 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
999 a request for netgroup lookup, may crash due to a double-free,
1000 potentially resulting in degraded service or Denial of Service on the
1001 local system. Reported by Chris Schanzle.
1003 CVE-2021-33574: The mq_notify function has a potential use-after-free
1004 issue when using a notification type of SIGEV_THREAD and a thread
1005 attribute with a non-default affinity mask.
1007 CVE-2021-35942: The wordexp function may overflow the positional
1008 parameter number when processing the expansion resulting in a crash.
1009 Reported by Philippe Antoine.
1011 The following bugs are resolved with this release:
1013 [4737] libc: fork is not async-signal-safe
1014 [5781] math: Slow dbl-64 sin/cos/sincos for special values
1015 [10353] libc: Methods for deleting all file descriptors greater than
1016 given integer (closefrom)
1017 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
1018 name containing multi-byte character(s)
1019 [14469] math: Inaccurate j0f function
1020 [14470] math: Inaccurate j1f function
1021 [14471] math: Inaccurate y0f function
1022 [14472] math: Inaccurate y1f function
1023 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
1025 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
1026 crashes if it fails dlsym() twice
1027 [15648] nptl: multiple definition of `__lll_lock_wait_private'
1028 [16063] nptl: Provide a pthread_once variant in libc directly
1029 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
1030 [17145] libc: syslog with LOG_CONS leaks console file descriptor
1031 [17183] manual: description of ENTRY struct in <search.h> in glibc
1033 [18435] nptl: pthread_once hangs when init routine throws an exception
1034 [18524] nptl: Missing calloc error checking in
1035 __cxa_thread_atexit_impl
1036 [19329] dynamic-link: dl-tls.c assert failure at concurrent
1037 pthread_create and dlopen
1038 [19366] nptl: returning from a thread should disable cancellation
1039 [19511] nptl: 8MB memory leak in pthread_create in case of failure
1040 when non-root user changes priority
1041 [20802] dynamic-link: getauxval NULL pointer dereference after static
1043 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
1044 [22057] malloc: malloc_usable_size is broken with mcheck
1045 [22668] locale: LC_COLLATE: the last character of ellipsis is not
1047 [23323] libc: [RFE] CSU startup hardening.
1048 [23328] malloc: Remove malloc hooks and ensure related APIs return no
1050 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
1051 $PLATFORM, $ORIGIN) crashes
1052 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
1053 [23554] nptl: pthread_getattr_np reports wrong stack size with
1055 [24106] libc: Bash interpreter in ldd script is taken from host
1056 [24773] dynamic-link: dlerror in an secondary namespace does not use
1057 the right free implementation
1058 [25036] localedata: Update collation order for Swedish
1059 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
1060 shm_open to pick wrong directory
1061 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
1062 crash in IFUNC resolver due to stack canary (--enable-stack-
1064 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
1065 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
1066 [27111] dynamic-link: pthread_create and tls access use link_map
1067 objects that may be concurrently freed by dlclose
1068 [27132] malloc: memusagestat is linked to system librt, leading to
1069 undefined symbols on major version upgrade
1070 [27136] dynamic-link: dtv setup at thread creation may leave an entry
1072 [27249] libc: libSegFault.so does not output signal number properly
1073 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
1075 [27318] dynamic-link: glibc fails to load binaries when built with
1076 -march=sandybridge: CPU ISA level is lower than required
1077 [27343] nss: initgroups() SIGSEGVs when called on a system without
1078 nsswich.conf (in a chroot)
1079 [27346] dynamic-link: x86: PTWRITE feature check is missing
1080 [27389] network: NSS chroot hardening causes regressions in chroot
1082 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
1083 [27444] libc: sysconf reports unsupported option (-1) for
1084 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
1085 [27462] nscd: double-free in nscd (CVE-2021-27645)
1086 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
1087 malloc/tst-malloc-thread-fail
1088 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
1089 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
1091 [27522] glob: glob, glob64 incorrectly marked as __THROW
1092 [27555] dynamic-link: Static tests fail with --enable-stack-
1094 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
1095 information for the current directory
1096 [27577] dynamic-link: elf/ld.so --help doesn't work
1097 [27605] libc: tunables can't control xsave/xsavec selection in
1098 dl_runtime_resolve_*
1099 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
1100 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
1102 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
1103 _nss_files_getcanonname_r) from within a dlmopen namespace.
1104 [27648] libc: FAIL: misc/tst-select
1105 [27650] stdio: vfscanf returns too early if a match is longer than
1107 [27651] libc: Performance regression after updating to 2.33
1108 [27655] string: Wrong size calculation in string/test-strnlen.c
1109 [27706] libc: select fails to update timeout on error
1110 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
1111 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
1112 tries resolving them lazily
1113 [27744] nptl: Support different libpthread/ld.so load orders in
1115 [27749] libc: Data race __run_exit_handlers
1116 [27761] libc: getconf: Segmentation fault when passing '-vq' as
1118 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
1119 exceeds maximum object size 2147483647
1120 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
1122 [27872] build: Obsolete configure option --enable-stackguard-
1124 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
1125 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
1126 [27892] libc: powerpc: scv ABI error handling fails to check
1128 [27896] nptl: mq_notify does not handle separately allocated thread
1129 attributes (CVE-2021-33574)
1130 [27901] libc: TEST_STACK_ALIGN doesn't work
1131 [27902] libc: The x86-64 clone wrapper fails to align child stack
1132 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1133 [27939] libc: aarch64: clone does not align the stack
1134 [27968] libc: s390x: clone does not align the stack
1135 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1136 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1137 with n >= 0x80000000
1138 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1139 thread never allocated anything
1140 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1141 [28064] string: x86_64:wcslen implementation list has wcsnlen
1142 [28067] libc: FAIL: posix/tst-spawn5
1143 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1144 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1146 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1147 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1148 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1150 [28091] network: ns_name_skip may return 0 for domain names without
1158 * The dynamic linker accepts the --list-tunables argument which prints
1159 all the supported tunables. This option is disable if glibc is
1160 configured with tunables disabled (--enable-tunables=no).
1162 * The dynamic linker accepts the --argv0 argument and provides opportunity
1163 to change argv[0] string.
1165 * The dynamic linker loads optimized implementations of shared objects
1166 from subdirectories under the glibc-hwcaps directory on the library
1167 search path if the system's capabilities meet the requirements for
1168 that subdirectory. Initially supported subdirectories include
1169 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1170 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1171 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1172 subdirectory names correspond to the vendor-independent x86-64
1173 microarchitecture levels defined in the x86-64 psABI supplement.
1175 * The new --help option of the dynamic linker provides usage and
1176 information and library search path diagnostics.
1178 * The mallinfo2 function is added to report statistics as per mallinfo,
1179 but with larger field widths to accurately report values that are
1180 larger than fit in an integer.
1182 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1184 * Support for the RISC-V ISA running on Linux has been expanded to run on
1185 32-bit hardware. This is supported for the following ISA and ABI pairs:
1191 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1194 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1195 glibc may use additional checks that may have an additional performance
1196 overhead. At present these checks are available only on LLVM 9 and later.
1197 The latest GCC available at this time (10.2) does not support this level of
1200 Deprecated and removed features, and other changes affecting compatibility:
1202 * The mallinfo function is marked deprecated. Callers should call
1205 * When dlopen is used in statically linked programs, alternative library
1206 implementations from HWCAP subdirectories are no longer loaded.
1207 Instead, the default implementation is used.
1209 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1210 removed. To support old binaries, the vtimes function continues to exist
1211 as a compatibility symbol. Applications should use the getrlimit or
1214 * Following a change in the tzdata 2018a release upstream, the zdump
1215 program is now installed in the /usr/bin subdirectory. Previously,
1216 the /usr/sbin subdirectory was used.
1218 * On s390(x), the type float_t is now derived from the macro
1219 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1220 hardcoded to double. This does not affect the ABI of any libraries
1221 that are part of the GNU C Library, but may affect the ABI of other
1222 libraries that use this type in their interfaces. The new definition
1223 improves consistency with compiler behavior in many scenarios.
1225 * A future version of glibc will stop loading shared objects from the
1226 "tls" subdirectories on the library search path, the subdirectory that
1227 corresponds to the AT_PLATFORM system name, and also stop employing
1228 the legacy AT_HWCAP search mechanism. Applications should switch to
1229 the new glibc-hwcaps mechanism instead; if they do not do that, only
1230 the baseline version (directly from the search path directory) will be
1233 Changes to build and runtime requirements:
1235 * On Linux, the system administrator needs to configure /dev/pts with
1236 the intended access modes for pseudo-terminals. glibc no longer
1237 attempts to adjust permissions of terminal devices. The previous glibc
1238 defaults ("tty" group, user read/write and group write) already
1239 corresponded to what most systems used, so that grantpt did not
1240 perform any adjustments.
1242 * On Linux, the posix_openpt and getpt functions no longer attempt to
1243 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1244 (and pseudo-terminals are supported), a devpts file system is mounted
1245 on /dev/pts. Current systems already meet these requirements.
1247 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1249 Security related changes:
1251 CVE-2021-3326: An assertion failure during conversion from the
1252 ISO-20220-JP-3 character set using the iconv function has been fixed.
1253 This assertion was triggered by certain valid inputs in which the
1254 converted output contains a combined sequence of two wide characters
1255 crossing a buffer boundary. Reported by Tavis Ormandy.
1257 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1258 invoked with input containing redundant shift sequences in the IBM1364,
1259 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1261 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1262 when invoked with UCS4 input containing an invalid character.
1264 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1265 invoked with EUC-KR input containing invalid multibyte input sequences.
1267 The following bugs are resolved with this release:
1269 [10635] libc: realpath portability patches
1270 [16124] dynamic-link: ld.so should allow to change argv[0]
1271 [17924] malloc: 'free' should not set errno
1272 [18683] libc: Linux faccessat implementation can incorrectly ignore
1274 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1275 [23091] hurd: missing waitid support
1276 [23249] libc: Epyc and other current AMD CPUs do not select the
1277 "haswell" platform subdirectory
1278 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1280 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1282 [24941] libc: Make grantpt usable after multi-threaded fork in more
1284 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1285 [24973] locale: iconv encounters segmentation fault when converting
1286 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1287 [25399] string: undefined reference to `__warn_memset_zero_len' when
1288 changing gnuc version
1289 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1291 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1293 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1294 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1295 [26100] libc: Race in syslog(3) with regards to tag printing.
1296 [26124] libc: Export <cpu-features.h>
1297 [26130] nscd: Inconsistent nscd cache during pruning
1298 [26203] libc: GLRO(dl_x86_cpu_features) may not be initialized
1299 [26224] locale: iconv hangs when converting some invalid inputs from
1300 several IBM character sets (CVE-2020-27618)
1301 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1302 too much stack space
1303 [26343] manual: invalid documented return type for strerrorname_np(),
1304 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1305 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1307 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1309 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1310 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1312 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1313 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1314 [26555] string: strerrorname_np does not return the documented value
1315 [26592] libc: pointer arithmetic overflows in realpath
1316 [26600] network: Transaction ID collisions cause slow DNS lookups in
1318 [26606] libc: [2.33 Regression] pselect is broken on x32
1319 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1320 [26620] glob: fnmatch with collating symbols results in segmentation
1322 [26625] libc: [2.33 Regression] CET is disabled
1323 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1324 at the end of a memory mapping
1325 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1326 by the caller to the kernel
1327 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1328 [26647] build: [-Werror=array-parameter=] due to different
1329 declarations for __sigsetjmp
1330 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1332 [26649] stdio: printf should handle non-normal x86 long double numbers
1333 gracefully (CVE-2020-29573)
1334 [26686] build: -Warray-parameter instances building with GCC 11
1335 [26687] build: -Warray-bounds instances building with GCC 11
1336 [26690] stdio: Aliasing violation in __vfscanf_internal
1337 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1338 [26726] build: GCC warning calling new_composite_name with an array of
1340 [26736] libc: FAIL: misc/tst-sysvshm-linux
1341 [26737] libc: Random FAIL: rt/tst-shm
1342 [26791] libc: Missing O_CLOEXEC in sysconf.c
1343 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1345 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1347 [26818] string: aarch64: string tests may run ifunc variants that are
1349 [26821] libc: Memory leak test failures on Fedora 33
1350 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1351 FSGSBASE/LM/RDRAND check failure
1352 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1354 [26853] libc: aarch64: Missing unwind information in statically linked
1356 [26923] locale: Assertion failure in iconv when converting invalid
1357 UCS4 (CVE-2020-29562)
1358 [26926] dynamic-link: aarch64: library dependencies are not bti
1360 [26932] libc: sh: Multiple floating point functions defined as stubs
1362 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1364 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1366 [27002] build: libc_freeres_fn build failure with GCC 11
1367 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1368 [27008] dynamic-link: ld.so.cache should have endianness markup
1369 [27042] libc: [alpha] anonymous union in struct stat confuses
1371 [27053] libc: Conformance regression in system(3) (and probably also
1373 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1375 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1376 [27083] libc: Unsafe unbounded alloca in addmntent
1377 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1379 [27130] string: "rep movsb" performance issue
1380 [27150] libc: alpha: wait4() is unavailable in static linking
1381 [27177] dynamic-link:
1382 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1384 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1385 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1386 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1387 related to combining characters (CVE-2021-3326)
1394 * Unicode 13.0.0 Support: Character encoding, character type info, and
1395 transliteration tables are all updated to Unicode 13.0.0, using
1396 generator scripts contributed by Mike FABIAN (Red Hat).
1398 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1400 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1401 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1402 Three ABIs are supported:
1408 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1409 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1411 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1412 DT_DEPAUDIT dynamic section entries of the main executable.
1414 * powerpc64le supports IEEE128 long double libm/libc redirects when
1415 using -mabi=ieeelongdouble to compile C code on supported GCC
1416 toolchains. It is recommended to use GCC 8 or newer when testing
1419 * To help detect buffer overflows and other out-of-bounds accesses
1420 several APIs have been annotated with GCC 'access' attribute. This
1421 should help GCC 10 issue better warnings.
1423 * On Linux, functions pthread_attr_setsigmask_np and
1424 pthread_attr_getsigmask_np have been added. They allow applications
1425 to specify the signal mask of a thread created with pthread_create.
1427 * The GNU C Library now provides the header file <sys/single_threaded.h>
1428 which declares the variable __libc_single_threaded. Applications are
1429 encouraged to use this variable for single-thread optimizations,
1430 instead of weak references to symbols historically defined in
1433 * The functions sigabbrev_np and sigdescr_np have been added. The
1434 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1435 SIGHUP) while sigdescr_np returns a string describing the signal number
1436 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1437 attempt to translate the return description, both functions return
1438 NULL for an invalid signal number.
1440 They should be used instead of sys_siglist or sys_sigabbrev and they
1441 are both thread and async-signal safe. These functions are GNU extensions.
1443 * The functions strerrorname_np and strerrordesc_np have been added. The
1444 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1445 while strerrordesc_np returns a string describing the error number
1446 (e.g "Invalid argument" for EINVAL). Different than strerror,
1447 strerrordesc_np does not attempt to translate the return description, both
1448 functions return NULL for an invalid error number.
1450 They should be used instead of sys_errlist and sys_nerr, both are
1451 thread and async-signal safe. These functions are GNU extensions.
1453 * AArch64 now supports standard branch protection security hardening
1454 in glibc when it is built with a GCC that is configured with
1455 --enable-standard-branch-protection (or if -mbranch-protection=standard
1456 flag is passed when building both GCC target libraries and glibc,
1457 in either case a custom GCC is needed). This includes branch target
1458 identification (BTI) and pointer authentication for return addresses
1459 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1460 extensions respectively for the protection to be effective,
1461 otherwise the used instructions are nops. User code can use PAC-RET
1462 without libc support, but BTI requires a libc that is built with BTI
1463 support, otherwise runtime objects linked into user code will not be
1466 Deprecated and removed features, and other changes affecting compatibility:
1468 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1469 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1470 RPC header files. Backward compatibility for old programs is kept
1471 only for architectures and ABIs that have been added in or before
1472 glibc 2.31. New programs need to use TI-RPC
1473 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1474 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1476 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1477 as shared library for backward compatibility and the NSS modules "nis"
1478 and "nisplus" are not built at all and libnsl's headers aren't
1479 installed. This compatibility is kept only for architectures and ABIs
1480 that have been added in or before version 2.28. Replacement
1481 implementations based on TI-RPC, which additionally support IPv6, are
1482 available from <https://github.com/thkukuk/>. This change does not
1483 affect the "compat" NSS module, which does not depend on libnsl
1484 since 2.27 and thus can be used without NIS.
1486 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1487 removed. To support old binaries, the sysctl function continues to
1488 exist as a compatibility symbol (on those architectures which had it),
1489 but always fails with ENOSYS. This reflects the removal of the system
1490 call from all architectures, starting with Linux 5.5.
1492 * The sstk function is no longer available to newly linked binaries.
1493 Its implementation always returned with a failure, and the function
1494 was not declared in any header file.
1496 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1497 sigrelse, sigignore and sigset, and the sigmask macro have been
1498 deprecated. Applications should use the sigsuspend, sigprocmask and
1499 sigaction functions instead.
1501 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1502 already supported this format for almost 20 years.
1504 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1505 are no longer available to newly linked binaries, and their declarations
1506 have been removed from <string.h>. They are exported solely as
1507 compatibility symbols to support old binaries. All programs should use
1510 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1511 are no longer available to newly linked binaries, and their declarations
1512 have been removed from <stdio.h>. They are exported solely as
1513 compatibility symbols to support old binaries. All programs should use
1514 strerror or strerror_r instead.
1516 * Both strerror and strerror_l now share the same internal buffer in the
1517 calling thread, meaning that the returned string pointer may be invalided
1518 or contents might be overwritten on subsequent calls in the same thread or
1519 if the thread is terminated. It makes strerror MT-safe.
1521 * Using weak references to libpthread functions such as pthread_create
1522 or pthread_key_create to detect the singled-threaded nature of a
1523 program is an obsolescent feature. Future versions of glibc will
1524 define pthread_create within libc.so.6 itself, so such checks will
1525 always flag the program as multi-threaded. Applications should check
1526 the __libc_single_threaded variable declared in
1527 <sys/single_threaded.h> instead.
1529 * The "files" NSS module no longer supports the "key" database (used for
1530 secure RPC). The contents of the /etc/publickey file will be ignored,
1531 regardless of the settings in /etc/nsswitch.conf. (This method of
1532 storing RPC keys only supported the obsolete and insecure AUTH_DES
1533 flavor of secure RPC.)
1535 * The __morecore and __after_morecore_hook malloc hooks and the default
1536 implementation __default_morecore have been deprecated. Applications
1537 should use malloc interposition to change malloc behavior, and mmap to
1538 allocate anonymous memory. A future version of glibc may require that
1539 applications which use the malloc hooks must preload a special shared
1540 object, to enable the hooks.
1542 * The hesiod NSS module has been deprecated and will be removed in a
1543 future version of glibc. System administrators are encouraged to
1544 switch to other approaches for networked account databases, such as
1547 Changes to build and runtime requirements:
1549 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1550 long double redirects.
1552 Security related changes:
1554 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1555 invoked with the -c option and when processing invalid multi-byte input
1556 sequences. Reported by Jan Engelhardt.
1558 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1559 corruption when they were passed a pseudo-zero argument. Reported by Guido
1560 Vranken / ForAllSecure Mayhem.
1562 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1563 expanding ~user has been fixed.
1565 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1566 memmove functions has been fixed. Discovered by Jason Royes and Samual
1567 Dytrych of the Cisco Security Assessment and Penetration Team (See
1570 The following bugs are resolved with this release:
1572 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1573 [10441] manual: Backtraces code example lacks error checking
1574 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1575 timer_sigev_thread dangerous
1576 [14231] stdio: stdio-common tests memory requirements
1577 [14578] libc: /proc-based emulation for lchmod, fchmodat
1578 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1579 filtee has constructor
1580 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1581 sequences (CVE-2016-10228)
1582 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1583 character entities for infinity & pi
1584 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1585 segfaults in applications
1586 [20543] libc: Please move from .gnu.linkonce to comdat
1587 [22489] network: gcc warns about implicit conversion in
1588 ICMP6_FILTER_SETPASS with -Wsign-conversion
1589 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1590 [23294] math: Complex _FloatN functions are redirected to the wrong
1591 function with -mlong-double-64
1592 [23296] libc: Data race in setting function descriptor during lazy
1594 [23668] dynamic-link: ldconfig: Default to the new format for
1596 [23819] hurd: hurd: Add C11 thread support
1597 [23990] build: test-container error out on failure to exec child.
1598 [23991] build: shell-container typo in run_command_array
1599 [24638] manual: Error in example of parsing a template string
1600 [24654] manual: Wrong declaration of wcschr in libc manual
1601 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1603 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1604 dynamically loaded dsos
1605 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1606 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1608 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1609 restore EAX, ECX and EDX
1610 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1611 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1612 [25420] network: Race condition in resolv_conf.c can result in caching
1613 stale configuration forever
1614 [25487] math: sinl() stack corruption from crafted input
1616 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1618 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1619 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1621 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1622 on 32 bit and old kernel
1623 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1624 [25639] localedata: Some names of days and months wrongly spelt in
1626 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1627 amount of sigset_t bytes
1628 [25691] stdio: printf: memory leak when printing long multibyte
1630 [25715] libc: system() returns wrong errors when posix_spawn fails
1631 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1632 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1633 state for conversions that produce two Unicode code points
1634 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1635 for linux x86_64 leads to livelock
1636 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1637 test failures, invalid instruction in ld.so
1638 [25790] glob: Typo in tst-fnmatch.input
1639 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1641 [25819] localedata: Update locale data to Unicode 13.0.0
1642 [25824] libc: Abnormal function of strnlen in aarch64
1643 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1644 [25896] libc: Incorrect prctl
1645 [25902] libc: Bad LOADARGS_N
1646 [25905] dynamic-link: VSX registers are corrupted during PLT
1647 resolution when glibc is built with --disable-multi-arch and --with-
1649 [25933] string: Off by one error in __strncmp_avx2 when
1650 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1652 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1653 exiting detached thread
1654 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1656 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1658 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1659 [26073] math: getpayload() has wrong return value
1660 [26076] dynamic-link: dlmopen crashes after failing to load
1661 dependencies in audit mode
1662 [26120] localedata: column width of of some Korean
1663 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1664 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1665 [26133] libc: Incorrect need_arch_feature_F16C
1666 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1668 [26149] libc: PKU is usable only if OSPKE is set
1669 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1671 [26208] libc: Incorrect bit_cpu_CLFSH
1672 [26210] network: Incorrect use of hidden symbols for global sunrpc
1674 [26211] stdio: printf integer overflow calculating allocation size
1675 [26214] stdio: printf_fp double free
1676 [26215] stdio: printf_fp memory leak
1677 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1678 [26258] nss: nss_compat should not read input files with mmap
1679 [26332] string: Incorrect cache line size load causes memory
1680 corruption in memset
1687 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1688 enable features from the draft ISO C2X standard. Only some features from
1689 this draft standard are supported by the GNU C Library, and as the draft
1690 is under active development, the set of features enabled by this macro is
1691 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1692 by compiling with "gcc -std=gnu2x".
1694 * The <math.h> functions that round their results to a narrower type now
1695 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1696 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1697 Clarification Request 13 to TS 18661-3.
1699 * The function pthread_clockjoin_np has been added, enabling join with a
1700 terminated thread with a specific clock. It allows waiting against
1701 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1703 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1705 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1706 in queries if the trust-ad option is set via the options directive in
1707 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1708 mode, the AD bit, as provided by the name server, is available to
1709 applications which call res_search and related functions. In the default
1710 mode, the AD bit is not set in queries, and it is automatically cleared in
1711 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1712 servers and the network path to them are treated as untrusted.)
1714 Deprecated and removed features, and other changes affecting compatibility:
1716 * The totalorder and totalordermag functions, and the corresponding
1717 functions for other floating-point types, now take pointer arguments to
1718 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1719 passing. This is in accordance with the resolution of Clarification
1720 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1721 floating-point arguments directly will continue to work.
1723 * The obsolete function stime is no longer available to newly linked
1724 binaries, and its declaration has been removed from <time.h>.
1725 Programs that set the system time should use clock_settime instead.
1727 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1728 in a future version of glibc. In this release, the header still exists
1729 but calling ftime will cause a compiler warning. All programs should use
1730 gettimeofday or clock_gettime instead.
1732 * The gettimeofday function no longer reports information about a
1733 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1734 many years, as it cannot handle the full complexity of the world's
1735 timezones, but hitherto we have supported it on a best-effort basis.
1736 Changes required to support 64-bit time_t on 32-bit architectures have
1737 made this no longer practical.
1739 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1740 should expect to receive a 'struct timezone' whose tz_minuteswest and
1741 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1742 happen on a few Linux-based ports. This will be corrected in a future
1745 All callers should supply a null pointer for the 'tzp' argument to
1746 gettimeofday. For accurate information about the time zone associated
1747 with the current time, use the localtime function.
1749 gettimeofday itself is obsolescent according to POSIX. We have no plans
1750 to remove access to this function, but portable programs should consider
1751 using clock_gettime instead.
1753 * The settimeofday function can still be used to set a system-wide time
1754 zone when the operating system supports it. This is because the Linux
1755 kernel reused the API, on some architectures, to describe a system-wide
1756 time-zone-like offset between the software clock maintained by the kernel,
1757 and the "RTC" clock that keeps time when the system is shut down.
1759 However, to reduce the odds of this offset being set by accident,
1760 settimeofday can no longer be used to set the time and the offset
1761 simultaneously. If both of its two arguments are non-null, the call
1762 will fail (setting errno to EINVAL).
1764 Callers attempting to set this offset should also be prepared for the call
1765 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1766 some Linux architectures. The Linux kernel maintainers are discussing a
1767 more principled replacement for the reused API. After a replacement
1768 becomes available, we will change settimeofday to fail with ENOSYS on all
1769 platforms when its 'tzp' argument is not a null pointer.
1771 settimeofday itself is obsolescent according to POSIX. Programs that set
1772 the system time should use clock_settime and/or the adjtime family of
1773 functions instead. We may cease to make settimeofday available to newly
1774 linked binaries after there is a replacement for Linux's time-zone-like
1777 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1778 the optional CAS instruction is implemented (for instance, LEON processors
1779 are still supported, but SuperSPARC processors are not).
1781 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1784 * If a lazy binding failure happens during dlopen, during the execution of
1785 an ELF constructor, the process is now terminated. Previously, the
1786 dynamic loader would return NULL from dlopen, with the lazy binding error
1787 captured in a dlerror message. In general, this is unsafe because
1788 resetting the stack in an arbitrary function call is not possible.
1790 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1791 executable stack unless explicitly configured at build time to require
1792 minimum kernel version 4.8 or newer. This is because executing
1793 floating-point branches on a non-executable stack on Linux kernels prior to
1794 4.8 can lead to application crashes for some MIPS configurations. While
1795 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1796 expected to enable non-executable stack by default with PT_GNU_STACK by
1797 default and is thus likely to trigger a crash on older kernels.
1799 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1800 non-executable stack while dropping support for older kernels.
1802 * System call wrappers for time system calls now use the new time64 system
1803 calls when available. On 32-bit targets, these wrappers attempt to call
1804 the new system calls first and fall back to the older 32-bit time system
1805 calls if they are not present. This may cause issues in environments
1806 that cannot handle unsupported system calls gracefully by returning
1807 -ENOSYS. Seccomp sandboxes are affected by this issue.
1809 Changes to build and runtime requirements:
1811 * It is no longer necessary to have recent Linux kernel headers to build
1812 working (non-stub) system call wrappers on all architectures except 64-bit
1813 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1815 * The ChangeLog file is no longer present in the toplevel directory of the
1816 source tree. ChangeLog files are located in the ChangeLog.old directory as
1817 ChangeLog.N where the highest N has the latest entries.
1819 Security related changes:
1821 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1822 out-of-bounds write when executed in a signal frame context.
1824 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1825 environment variable during program execution after a security
1826 transition, allowing local attackers to restrict the possible mapping
1827 addresses for loaded libraries and thus bypass ASLR for a setuid
1828 program. Reported by Marcin Kościelnicki.
1830 The following bugs are resolved with this release:
1832 [12031] localedata: iconv -t ascii//translit with Greek characters
1833 [15813] libc: Multiple issues in __gen_tempname
1834 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1835 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1836 [19767] libc: vdso is not used with static linking
1837 [19903] hurd: Shared mappings not being inherited by children processes
1838 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1839 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1841 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1842 Symbols-A/B Unicode blocks
1843 [23518] libc: Eliminate __libc_utmp_jump_table
1844 [24026] malloc: malloc_info() returns wrong numbers
1845 [24054] localedata: Many locales are missing date_fmt
1846 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1847 [24304] dynamic-link: Lazy binding failure during ELF
1848 constructors/destructors is not fatal
1849 [24376] libc: RISC-V symbol size confusion with _start
1850 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1852 [24824] libc: test-in-container does not install charmap files compatible
1854 [24844] regex: regex bad pointer / leakage if malloc fails
1855 [24867] malloc: Unintended malloc_info formatting changes
1856 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1857 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1858 [24882] libc: login: pututline uses potentially outdated cache
1859 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1860 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1862 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1864 [24930] dynamic-link: dlopen of PIE executable can result in
1865 _dl_allocate_tls_init assertion failure
1866 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1867 (stringop-overflow error)
1868 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1869 functions other can lead to crashes
1870 [24967] libc: jemalloc static linking causes runtime failure
1871 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1873 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1874 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1875 [25097] libc: new -Warray-bounds with GCC 10
1876 [25112] dynamic-link: dlopen must not make new objects accessible when it
1877 still can fail with an error
1878 [25139] localedata: Please add the new mnw_MM locale
1879 [25149] regex: Array bounds violation in proceed_next_node
1880 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1881 initialized correctly
1882 [25189] libc: glibc's __glibc_has_include causes issues with clang
1884 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1885 value to an unsigned
1886 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1887 binaries (CVE-2019-19126)
1888 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1890 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1892 [25232] string: <string.h> does not enable const correctness for strchr et
1894 [25233] localedata: Consider "." as the thousands separator for sl_SI
1896 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1897 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1898 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1900 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1901 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1903 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1904 (dl_initfirst) link map pointer
1905 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1906 [25423] libc: Array overflow in backtrace on powerpc
1907 [25425] network: Missing call to __resolv_context_put in
1908 getaddrinfo.c:gethosts
1915 * Unicode 12.1.0 Support: Character encoding, character type info, and
1916 transliteration tables are all updated to Unicode 12.1.0, using
1917 generator scripts contributed by Mike FABIAN (Red Hat).
1919 * The dynamic linker accepts the --preload argument to preload shared
1920 objects, in addition to the LD_PRELOAD environment variable.
1922 * The twalk_r function has been added. It is similar to the existing
1923 twalk function, but it passes an additional caller-supplied argument
1924 to the callback function.
1926 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1928 * Minguo (Republic of China) calendar support has been added as an
1929 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1932 * The entry for the new Japanese era has been added for ja_JP locale.
1934 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1935 pvalloc, memalign, and posix_memalign fail now with total object size
1936 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1937 pointer subtraction within the allocated object, where results might
1938 overflow the ptrdiff_t type.
1940 * The dynamic linker no longer refuses to load objects which reference
1941 versioned symbols whose implementation has moved to a different soname
1942 since the object has been linked. The old error message, symbol
1943 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1944 link time reference, is gone.
1946 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1947 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1948 functions. These behave similarly to their "timed" equivalents, but also
1949 accept a clockid_t parameter to determine which clock their timeout should
1950 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1951 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1952 time of the wait (unlike with pthread_condattr_setclock, which requires
1953 the clock choice at initialization time).
1955 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1956 work, new resolvers can use a second argument which can be extended in
1957 the future, currently it contains the AT_HWCAP2 value.
1959 Deprecated and removed features, and other changes affecting compatibility:
1961 * The copy_file_range function fails with ENOSYS if the kernel does not
1962 support the system call of the same name. Previously, user space
1963 emulation was performed, but its behavior did not match the kernel
1964 behavior, which was deemed too confusing. Applications which use the
1965 copy_file_range function can no longer rely on glibc to provide a fallback
1966 on kernels that do not support the copy_file_range system call, and if
1967 this function returns ENOSYS, they will need to use their own fallback.
1968 Support for copy_file_range for most architectures was added in version
1969 4.5 of the mainline Linux kernel.
1971 * The functions clock_gettime, clock_getres, clock_settime,
1972 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1973 for new applications (on architectures which had them). Instead, the
1974 definitions in libc will be used automatically, which have been available
1977 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1978 and <sys/stropts.h> have been removed.
1980 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1981 resolver flag (deprecated in glibc 2.25) have been removed.
1983 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1984 resolver have been removed from <resolv.h>.
1986 * With --enable-bind-now, installed programs are now linked with the
1989 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1990 configurations) has been removed, following the deprecation of this
1991 subarchitecture in version 8 of GCC, and its removal in version 9.
1993 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1994 header have been removed.
1996 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1997 deprecated and will be removed from a future version of glibc.
1998 Application should directly access /proc instead. For obtaining random
1999 bits, the getentropy function can be used.
2001 Changes to build and runtime requirements:
2003 * GCC 6.2 or later is required to build the GNU C Library.
2005 Older GCC versions and non-GNU compilers are still supported when
2006 compiling programs that use the GNU C Library.
2008 Security related changes:
2010 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
2011 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
2012 has undefined behavior. On x32, the size_t argument may be passed
2013 in the lower 32 bits of the 64-bit RDX register with non-zero upper
2014 32 bits. When it happened with the sign bit of RDX register set,
2015 memcmp gave the wrong result since it treated the size argument as
2016 zero. Reported by H.J. Lu.
2018 CVE-2019-9169: Attempted case-insensitive regular-expression match
2019 via proceed_next_node in posix/regexec.c leads to heap-based buffer
2020 over-read. Reported by Hongxu Chen.
2022 The following bugs are resolved with this release:
2024 [2872] locale: Transliteration Cyrillic -> ASCII fails
2025 [6399] libc: gettid() should have a wrapper
2026 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
2027 [16976] glob: fnmatch unbounded stack VLA for collating symbols
2028 [17396] localedata: globbing for locale by [[.collating-element.]]
2029 [18035] dynamic-link: pldd does no longer work, enters infinite loop
2030 [18465] malloc: memusagestat is built using system C library
2031 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
2032 invalid input drops valid char
2033 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
2034 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
2035 [21897] localedata: Afar locales: Fix mon, abmon, and abday
2036 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
2037 [23352] malloc: __malloc_check_init still defined in public header
2039 [23403] nptl: Wrong alignment of TLS variables
2040 [23501] libc: nftw() doesn't return dangling symlink's inode
2041 [23733] malloc: Check the count before calling tcache_get()
2042 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
2044 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
2045 [23844] nptl: pthread_rwlock_trywrlock results in hang
2046 [23983] argparse: Missing compat versions of argp_failure and argp_error
2047 for long double = double
2048 [23984] libc: Missing compat versions of err.h and error.h functions for
2049 long double = double
2050 [23996] localedata: Dutch salutations
2051 [24040] libc: riscv64: unterminated call chain in __thread_start
2052 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
2054 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
2055 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
2057 [24114] regex: regexec buffer read overrun in "grep -i
2058 '\(\(\)*.\)*\(\)\(\)\1'"
2059 [24122] libc: Segfaults if 0 returned from la_version
2060 [24153] stdio: Some input functions do not react to stdin assignment
2061 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
2062 RDX is set) (CVE-2019-7309)
2063 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
2064 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
2065 not the default "nor"
2066 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
2067 false positives, change to modern flexible array
2068 [24180] nptl: pthread_mutex_trylock does not use the correct order of
2069 instructions while maintaining the robust mutex list due to missing
2071 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
2072 unnecessary librt dependencies
2073 [24200] localedata: Revert first_weekday removal in en_IE locale
2074 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
2075 [24215] nptl: pthread_timedjoin_np should be a cancellation point
2076 [24216] malloc: Check for large bin list corruption when inserting
2078 [24228] stdio: old x86 applications that use legacy libio crash on exit
2079 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
2081 [24293] localedata: Missing Minguo calendar support for TW locales
2082 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
2083 tt_RU (Tatar) locale
2084 [24307] localedata: Update locale data to Unicode 12.0.0
2085 [24323] dynamic-link: dlopen should not be able open PIE objects
2086 [24335] build: "Obsolete types detected" with Linux 5.0 headers
2087 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
2088 tt_RU (Tatar) locale
2089 [24370] localedata: Add lang_name for tt_RU locale
2090 [24372] locale: Binary locale files are not architecture independent
2091 [24394] time: strptime %Ey mis-parses final year of era
2092 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
2094 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
2096 [24531] malloc: Malloc tunables give tcache assertion failures
2097 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
2099 [24535] localedata: Update locale data to Unicode 12.1.0
2100 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
2101 kernels and break testing
2102 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
2103 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
2104 [-Werror=format-overflow=]
2105 [24570] libc: alpha: compat msgctl uses __IPC_64
2106 [24584] locale: Data race in __wcsmbs_clone_conv
2107 [24588] stdio: Remove codecvt vtables from libio
2108 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
2110 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
2111 [24632] stdio: Old binaries which use freopen with default stdio handles
2113 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
2115 [24652] localedata: szl_PL spelling correction
2116 [24695] nss: nss_db: calling getpwent after endpwent crashes
2117 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
2118 in /etc/nsswitch.conf
2119 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
2120 [24740] libc: getdents64 type confusion
2121 [24741] dynamic-link: ld.so should not require that a versioned symbol is
2122 always implemented in the same library
2123 [24744] libc: Remove copy_file_range emulation
2124 [24757] malloc: memusagestat is linked against system libpthread
2125 [24794] libc: Partial test suite run builds corrupt test-in-container
2133 * The getcpu wrapper function has been added, which returns the currently
2134 used CPU and NUMA node. This function is Linux-specific.
2136 * A new convenience target has been added for distribution maintainers
2137 to build and install all locales as directories with files. The new
2138 target is run by issuing the following command in your build tree:
2139 'make localedata/install-locale-files', with an optional DESTDIR
2140 to set the install root if you wish to install into a non-default
2141 configured location.
2143 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2145 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2146 for _GNU_SOURCE, to match BSD environments.
2148 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2149 indicates that it will abort the transaction prior to entering the kernel
2150 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2151 suspended, and this caused some undefined side-effects issues by aborting
2152 transactions manually. Glibc avoided it by abort transactions manually on
2153 each syscall, but it lead to performance issues on newer kernels where the
2154 HTM state is saved and restore lazily (the state being saved even when the
2155 process actually does not use HTM).
2157 * The functions posix_spawn_file_actions_addchdir_np and
2158 posix_spawn_file_actions_addfchdir_np have been added, enabling
2159 posix_spawn and posix_spawnp to run the new process in a different
2160 directory. These functions are GNU extensions. The function
2161 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2164 * The popen and system do not run atfork handlers anymore (BZ#17490).
2165 Although it is a possible POSIX violation, the POSIX rationale in
2166 pthread_atfork documentation regarding atfork handlers is to handle
2167 inconsistent mutex state after a fork call in a multi-threaded process.
2168 In both popen and system there is no direct access to user-defined mutexes.
2170 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2171 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2173 - C-SKY ABIV2 soft-float little-endian
2174 - C-SKY ABIV2 hard-float little-endian
2176 * strftime's default formatting of a locale's alternative year (%Ey)
2177 has been changed to zero-pad the year to a minimum of two digits,
2178 like "%y". This improves the display of Japanese era years during
2179 the first nine years of a new era, and is expected to be harmless
2180 for all other locales (only Japanese locales regularly have
2181 alternative year numbers less than 10). Zero-padding can be
2182 overridden with the '_' or '-' flags (which are GNU extensions).
2184 * As a GNU extension, the '_' and '-' flags can now be applied to
2185 "%EY" to control how the year number is formatted; they have the
2186 same effect that they would on "%Ey".
2188 Deprecated and removed features, and other changes affecting compatibility:
2190 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2191 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2193 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2194 in <sys/procfs.h>, has been corrected to match the type actually used by
2195 the Linux kernel. This affects the size and layout of that structure on
2196 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2198 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2199 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2200 defined in <sys/procfs.h>, has been corrected to match the type actually
2201 used by the Linux kernel. This affects the size and layout of those
2204 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2205 meant to scan a string and allocate space for it with malloc, is now
2206 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2207 defined. This extension conflicts with C99's use of '%a' to scan a
2208 hexadecimal floating-point number, which is now available to programs
2209 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2211 POSIX.1-2008 includes the feature of allocating a buffer for string input
2212 with malloc, using the modifier letter 'm' instead. Programs using
2213 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2214 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2215 C99 '%a' no longer need to avoid _GNU_SOURCE.
2217 GCC's -Wformat warnings can detect most uses of this extension, as long
2218 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2219 __attribute__ ((format (scanf, ...))).
2221 Changes to build and runtime requirements:
2223 * Python 3.4 or later is required to build the GNU C Library.
2225 * On most architectures, GCC 5 or later is required to build the GNU C
2226 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2228 Older GCC versions and non-GNU compilers are still supported when
2229 compiling programs that use the GNU C Library.
2231 Security related changes:
2233 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2234 denial of service due to resource exhaustion when processing getaddrinfo
2235 calls with crafted host names. Reported by Guido Vranken.
2237 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2238 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2239 happened, accessing the 32-bit size_t value as the full 64-bit register
2240 in the assembly string/memory functions would cause a buffer overflow.
2241 Reported by H.J. Lu.
2243 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2244 addresses with arbitrary trailing characters, potentially leading to data
2245 or command injection issues in applications.
2247 The following bugs are resolved with this release:
2249 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2250 [10496] localedata: 12h time representation in multiple locales faulty
2251 [10797] localedata: it_IT locale numeric does not have a separator for
2253 [11319] libc: dprintf doesn't handle errors properly
2254 [16346] time: mktime: potentially unsafe use of localtime_offset
2255 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2257 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2258 posix_spawn_file_actions_addfchdir_np
2259 [17426] localedata: Indian locales: set the correct date format
2260 [17490] stdio: popen should not invoke atfork handlers
2261 [17783] libc: TIOCSER_TEMT conditions inconsistent
2262 [18040] regex: use-after-free in regexec/get_subexp
2263 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2264 [20018] network: getaddrinfo should reject IP addresses with trailing
2265 characters (CVE-2016-10739)
2266 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2267 [20271] libc: Missing "\n" in __libc_fatal calls
2268 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2269 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2270 pointer argument is non-NULL
2271 [21037] stdio: open_memstream and freopen
2272 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2273 [21716] time: Crash in glibc's mktime in low-memory situations
2274 [22834] stdio: Subprocess forked by popen may crash in Linux when
2275 multithreads call popen
2276 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2277 and pthread_create fails.
2278 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2279 [23125] libc: riscv64: endless loop when throwing an exception from a
2281 [23275] nptl: Race in pthread_mutex_lock while promoting to
2282 PTHREAD_MUTEX_ELISION_NP.
2283 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2285 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2287 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2289 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2290 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2292 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2293 [23521] nss: get_next_alias nss_files file stream leak
2294 [23538] nptl: Hang in pthread_cond_broadcast
2295 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2296 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2297 [23579] libc: Errors misreported in preadv2
2298 [23597] build: support/test-container.c doesn't work with different
2300 [23603] time: mktime signed integer overflow on large timestamps
2301 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2302 [23614] libc: powerpc: missing CFI register information in __mpn_*
2304 [23637] string: Generic strstr/strcasestr fails with huge needles
2305 [23640] libc: no way to easily clear FD_CLOEXEC in
2306 posix_spawn_file_actions_adddup2()
2307 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2309 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2311 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2312 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2313 bits/types/struct_rusage.h
2314 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2316 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2318 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2319 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2320 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2322 [23724] localedata: Albanian date formats are incorrect
2323 [23735] math: libnldbl_nonshared.a references internal libm symbols
2324 [23740] localedata: kl_GL: Month names and date formats need update
2325 [23744] regex: regex refactorings to remove BE, avoid duplication
2326 [23745] time: mktime fix for Gnulib + coreutils
2327 [23758] time: Improve the width of alternate representation for year in
2329 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2330 [23789] time: mktime does not set errno on failure
2331 [23791] localedata: Wrong monetary format for ca_ES locale
2332 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2333 [23794] locale: c16rtomb does not handle surrogate pairs
2334 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2335 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2336 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2337 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2338 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2339 [23862] libc: [sh] missing kernel-features.h undefines
2340 [23864] libc: [riscv] missing kernel-features.h undefines
2341 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2342 [23907] malloc: Incorrect double-free malloc tcache check disregards
2344 [23913] libc: off-by-one in function maybe_script_execute in
2345 sysdeps/posix/spawni.c
2346 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2347 [23923] locale: Add --no-hard-links option to localedef
2348 [23927] network: Linux if_nametoindex() does not close descriptor
2350 [23961] math: powf can overflow to inf without setting errno in non-
2351 nearest rounding mode
2352 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2353 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2354 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2355 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2356 [24011] localedata: Fixed small type in comment for locale bs_BA
2357 [24018] libc: gettext() may return NULL
2358 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2359 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2360 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2362 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2363 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2365 [24046] localedata: en_US locale doesn't define date_fmt
2366 [24063] manual: @var{errno} should be @code{errno}
2367 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2368 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2370 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2372 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2374 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2376 [24112] network: Do not send DNS queries for non-host names (where all
2377 answers will be rejected)
2378 [24130] libc: alpha __remqu corrupts $f3 register
2385 * The localization data for ISO 14651 is updated to match the 2016
2386 Edition 4 release of the standard, this matches data provided by
2387 Unicode 9.0.0. This update introduces significant improvements to the
2388 collation of Unicode characters. This release deviates slightly from
2389 the standard in that the collation element ordering for lowercase and
2390 uppercase LATIN script characters is adjusted to ensure that regular
2391 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2392 is not matched by [a-z]. With the update many locales have been
2393 updated to take advantage of the new collation information. The new
2394 collation information has increased the size of the compiled locale
2395 archive or binary locales.
2397 * The GNU C Library can now be compiled with support for Intel CET, AKA
2398 Intel Control-flow Enforcement Technology. When the library is built
2399 with --enable-cet, the resulting glibc is protected with indirect
2400 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2401 compatible with all existing executables and shared libraries. This
2402 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2403 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2404 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2405 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2406 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2407 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2410 * The GNU C Library now has correct support for ABSOLUTE symbols
2411 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2412 relocated incorrectly or in some cases discarded. The GNU linker can
2413 make use of the newer semantics, but it must communicate it to the
2414 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2415 field) to indicate such support is required.
2417 * Unicode 11.0.0 Support: Character encoding, character type info, and
2418 transliteration tables are all updated to Unicode 11.0.0, using
2419 generator scripts contributed by Mike FABIAN (Red Hat).
2421 * <math.h> functions that round their results to a narrower type are added
2422 from TS 18661-1:2014 and TS 18661-3:2015:
2424 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2425 fMxaddfNx functions.
2427 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2428 fMxsubfNx functions.
2430 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2431 fMxmulfNx functions.
2433 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2434 fMxdivfNx functions.
2436 * Two grammatical forms of month names are now supported for the following
2437 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2438 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2439 support two grammatical forms in abbreviated month names: Catalan, Greek,
2442 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2443 include the support for two grammatical forms of month names.
2445 * Building and running on GNU/Hurd systems now works without out-of-tree
2448 * The renameat2 function has been added, a variant of the renameat function
2449 which has a flags argument. If the flags are zero, the renameat2 function
2450 acts like renameat. If the flag is not zero and there is no kernel
2451 support for renameat2, the function will fail with an errno value of
2452 EINVAL. This is different from the existing gnulib function renameatu,
2453 which performs a plain rename operation in case of a RENAME_NOREPLACE
2454 flags and a non-existing destination (and therefore has a race condition
2455 that can clobber the destination inadvertently).
2457 * The statx function has been added, a variant of the fstatat64
2458 function with an additional flags argument. If there is no direct
2459 kernel support for statx, glibc provides basic stat support based on
2460 the fstatat64 function.
2462 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2463 library if installed. libidn2 version 2.0.5 or later is recommended. If
2464 libidn2 is not available, internationalized domain names are not encoded
2465 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2466 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2467 with an encoding error.) Flags which used to change the IDN encoding and
2468 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2469 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2470 deprecated. They no longer have any effect.
2472 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2473 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2474 range of ELF gABI expressions including such constructs as
2475 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2476 have been further restricted, and where in the past a dynamic string
2477 token sequence may have been interpreted as a literal string it will
2478 now cause a load failure. These load failures were always considered
2479 unspecified behaviour from the perspective of the dynamic loader, and
2480 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2481 results in a load failure now.
2483 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2484 implementation includes all the standard functions provided by
2487 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2488 thrd_detach, thrd_exit, and thrd_join for thread management.
2490 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2491 mtx_destroy for mutual exclusion.
2493 - call_once for function call synchronization.
2495 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2496 cnd_wait for conditional variables.
2498 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2500 Application developers must link against libpthread to use ISO C threads.
2502 Deprecated and removed features, and other changes affecting compatibility:
2504 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2505 installed. Software that was using either header should be updated to
2506 use standard <stdio.h> interfaces instead.
2508 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2509 This was never required by the C standard, and the macros just expanded
2510 to call alternative names for the same functions. If you hoped getc and
2511 putc would provide performance improvements over fgetc and fputc, instead
2512 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2513 necessary, flockfile and funlockfile.
2515 * All stdio functions now treat end-of-file as a sticky condition. If you
2516 read from a file until EOF, and then the file is enlarged by another
2517 process, you must call clearerr or another function with the same effect
2518 (e.g. fseek, rewind) before you can read the additional data. This
2519 corrects a longstanding C99 conformance bug. It is most likely to affect
2520 programs that use stdio to read interactive input from a terminal.
2523 * The macros 'major', 'minor', and 'makedev' are now only available from
2524 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2525 headers that happen to include <sys/types.h>. These macros are rarely
2526 used, not part of POSIX nor XSI, and their names frequently collide with
2527 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2528 further explanation.
2530 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2531 these macros should first include <sys/types.h>, and then include
2532 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2534 * The tilegx*-*-linux-gnu configurations are no longer supported.
2536 * The obsolete function ustat is no longer available to newly linked
2537 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2538 function has been deprecated in favor of fstatfs and statfs.
2540 * The obsolete function nfsservctl is no longer available to newly linked
2541 binaries. This function was specific to systems using the Linux kernel
2542 and could not usefully be used with the GNU C Library on systems with
2543 version 3.1 or later of the Linux kernel.
2545 * The obsolete function name llseek is no longer available to newly linked
2546 binaries. This function was specific to systems using the Linux kernel
2547 and was not declared in a header. Programs should use the lseek64 name
2548 for this function instead.
2550 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2551 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2552 previously selected by them is now always enabled.
2554 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2555 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2556 restriction (rejecting '_' in host names, among other things) has been
2557 removed, for increased compatibility with non-IDN name resolution.
2559 * The fcntl function now have a Long File Support variant named fcntl64. It
2560 is added to fix some Linux Open File Description (OFD) locks usage on non
2561 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2562 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2563 locks act as a cancellation entrypoint.
2565 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2566 ecb_crypt, and des_setparity are no longer available to newly linked
2567 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2568 longer installed. These functions encrypted and decrypted data with the
2569 DES block cipher, which is no longer considered secure. Software that
2570 still uses these functions should switch to a modern cryptography library,
2573 * Reflecting the removal of the encrypt and setkey functions above, the
2574 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2575 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2578 * The obsolete function fcrypt is no longer available to newly linked
2579 binaries. It was just another name for the standard function crypt,
2580 and it has not appeared in any header file in many years.
2582 * We have tentative plans to hand off maintenance of the passphrase-hashing
2583 library, libcrypt, to a separate development project that will, we hope,
2584 keep up better with new passphrase-hashing algorithms. We will continue
2585 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2586 'crypt_r' should not need to change at all; however, distributions will
2587 need to install <crypt.h> and libcrypt from a separate project.
2589 In this release, if the configure option --disable-crypt is used, glibc
2590 will not install <crypt.h> or libcrypt, making room for the separate
2591 project's versions of these files. The plan is to make this the default
2592 behavior in a future release.
2594 Changes to build and runtime requirements:
2596 GNU make 4.0 or later is now required to build glibc.
2598 Security related changes:
2600 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2601 been fixed by removing the glibc-internal IDNA implementation and using
2602 the system-provided libidn2 library instead. Originally reported by Hanno
2603 Böck and Christian Weisgerber.
2605 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2606 architecture could corrupt memory. Reported by Max Horn.
2608 CVE-2018-11236: Very long pathname arguments to realpath function could
2609 result in an integer overflow and buffer overflow. Reported by Alexey
2612 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2613 architecture could write beyond the target buffer, resulting in a buffer
2614 overflow. Reported by Andreas Schwab.
2616 The following bugs are resolved with this release:
2618 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2619 [6889] manual: 'PWD' mentioned but not specified
2620 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2621 when __WORDSIZE != 64
2622 [13762] regex: re_search etc. should return -2 on memory exhaustion
2623 [13888] build: /tmp usage during testing
2624 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2625 [14092] nptl: Support C11 threads
2626 [14095] localedata: Review / update collation data from Unicode / ISO
2628 [14508] libc: -Wformat warnings
2629 [14553] libc: Namespace pollution loff_t in sys/types.h
2630 [14890] libc: Make NT_PRFPREG canonical.
2631 [15105] libc: Extra PLT references with -Os
2632 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2634 [16335] manual: Feature test macro documentation incomplete and out of
2636 [16552] libc: Unify umount implementations in terms of umount2
2637 [17082] libc: htons et al.: statement-expressions prevent use on global
2638 scope with -O1 and higher
2639 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2640 [17438] localedata: pt_BR: wrong d_fmt delimiter
2641 [17662] libc: please implement binding for the new renameat2 syscall
2642 [17721] libc: __restrict defined as /* Ignore */ even in c11
2643 [17979] libc: inconsistency between uchar.h and stdint.h
2644 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2645 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2646 horrible machine code)
2647 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2649 [18471] libc: llseek should be a compat symbol
2650 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2652 [18991] nss: nss_files skips large entry in database
2653 [19239] libc: Including stdlib.h ends up with macros major and minor being
2655 [19463] libc: linknamespace failures when compiled with -Os
2656 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2657 [19527] locale: Normalized charset name not recognized by setlocale
2658 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2659 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2661 [19728] network: out of bounds stack read in libidn function
2662 idna_to_ascii_4i (CVE-2016-6261)
2663 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2664 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2665 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2667 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2668 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2669 [20419] dynamic-link: files with large allocated notes crash in
2671 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2672 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2673 [20980] manual: CFLAGS environment variable replaces vital options
2674 [21163] regex: Assertion failure in pop_fail_stack when executing a
2675 malformed regexp (CVE-2015-8985)
2676 [21234] manual: use of CFLAGS makes glibc detect no optimization
2677 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2678 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2679 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2680 [21508] locale: intl/tst-gettext failure with latest msgfmt
2681 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2682 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2683 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2685 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2687 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2688 [22247] network: Integer overflow in the decode_digit function in
2689 puny_decode.c in libidn (CVE-2017-14062)
2690 [22342] nscd: NSCD not properly caching netgroup
2691 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2692 [22550] localedata: es_ES locale (and other es_* locales): collation
2693 should treat ñ as a primary different character, sync the collation
2694 for Spanish with CLDR
2695 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2696 by gcc configured with --enable-default-pie
2697 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2698 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2699 crossing 2GB threshold (CVE-2017-18269)
2700 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2702 [22735] time: Misleading typo in time.h source comment regarding
2704 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2705 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2706 `__assert_perror_fail ()' to `__assert_fail_base ()'
2707 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2709 [22786] libc: Stack buffer overflow in realpath() if input size is close
2710 to SSIZE_MAX (CVE-2018-11236)
2711 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2712 through an absolute DT_NEEDED path
2713 [22792] build: tcb-offsets.h dependency dropped
2714 [22797] libc: pkey_get() uses non-reserved name of argument
2715 [22807] libc: PTRACE_* constants missing for powerpc
2716 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2717 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2718 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2719 [22848] localedata: ca_ES: update date definitions from CLDR
2720 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2721 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2722 [22896] localedata: Update locale data for an_ES
2723 [22902] math: float128 test failures with GCC 8
2724 [22918] libc: multiple common of `__nss_shadow_database'
2725 [22919] libc: sparc32: backtrace yields infinite backtrace with
2727 [22926] libc: FTBFS on powerpcspe
2728 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2730 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2731 [22947] libc: FAIL: misc/tst-preadvwritev2
2732 [22963] localedata: cs_CZ: Add alternative month names
2733 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2734 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2735 [22998] dynamic-link: execstack tests are disabled when SELinux is
2737 [23005] network: Crash in __res_context_send after memory allocation
2739 [23007] math: strtod cannot handle -nan
2740 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2741 [23036] regex: regex equivalence class regression
2742 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2743 [23069] libc: sigaction broken on riscv64-linux-gnu
2744 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2745 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2746 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2747 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2748 and libc build with -Os)
2749 [23140] localedata: More languages need two forms of month names
2750 [23145] libc: _init/_fini aren't marked as hidden
2751 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2752 [23171] math: C++ iseqsig for long double converts arguments to double
2753 [23178] nscd: sudo will fail when it is run in concurrent with commands
2754 that changes /etc/passwd
2755 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2757 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2758 [23208] localedata: New locale - Lower Sorbian (dsb)
2759 [23233] regex: Memory leak in build_charclass_op function in file
2761 [23236] stdio: Harden function pointers in _IO_str_fields
2762 [23250] nptl: Offset of __private_ss differs from GCC
2763 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2764 -mtune=generic -mfpmath=sse
2765 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2767 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2768 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2770 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2771 [23277] math: nan function should not have const attribute
2772 [23279] math: scanf and strtod wrong for some hex floating-point
2773 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2775 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2776 [23303] build: undefined reference to symbol
2777 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2778 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2780 [23313] stdio: libio vtables validation and standard file object
2782 [23329] libc: The __libc_freeres infrastructure is not properly run across
2784 [23349] libc: Various glibc headers no longer compatible with
2786 [23351] malloc: Remove unused code related to heap dumps and malloc
2788 [23363] stdio: stdio-common/tst-printf.c has non-free license
2789 [23396] regex: Regex equivalence regression in single-byte locales
2790 [23422] localedata: oc_FR: More updates of locale data
2791 [23442] build: New warning with GCC 8
2792 [23448] libc: Out of bounds access in IBM-1390 converter
2793 [23456] libc: Wrong index_cpu_LZCNT
2794 [23458] build: tst-get-cpu-features-static isn't added to tests
2795 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2797 [23467] dynamic-link: x86/CET: A property note parser bug
2804 * The GNU C Library can now be compiled with support for building static
2805 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2806 executables are like static executables but can be loaded at any address
2807 and provide additional security hardening benefits at the cost of some
2808 memory and performance. When the library is built with --enable-static-pie
2809 the resulting libc.a is usable with GCC 8 and above to create static PIE
2810 executables using the GCC option '-static-pie'. This feature is currently
2811 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2812 aarch64 with binutils 2.30 or later.
2814 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2815 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2818 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2820 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2822 * In order to support faster and safer process termination the malloc API
2823 family of functions will no longer print a failure address and stack
2824 backtrace after detecting heap corruption. The goal is to minimize the
2825 amount of work done after corruption is detected and to avoid potential
2826 security issues in continued process execution. Reducing shutdown time
2827 leads to lower overall process restart latency, so there is benefit both
2828 from a security and performance perspective.
2830 * The abort function terminates the process immediately, without flushing
2831 stdio streams. Previous glibc versions used to flush streams, resulting
2832 in deadlocks and further data corruption. This change also affects
2833 process aborts as the result of assertion failures.
2835 * On platforms where long double has the IEEE binary128 format (aarch64,
2836 alpha, mips64, riscv, s390 and sparc), the math library now implements
2837 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2838 These are the same interfaces added in version 2.26 for some platforms where
2839 this format is supported but is not the format of long double.
2841 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2842 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2843 implements interfaces for that type, as defined by ISO/IEC TS
2844 18661-3:2015. These are corresponding interfaces to those supported for
2847 * The math library now implements interfaces for the _Float32, _Float64 and
2848 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2849 corresponding interfaces to those supported for _Float128.
2851 * glibc now implements the memfd_create and mlock2 functions on Linux.
2853 * Support for memory protection keys was added. The <sys/mman.h> header now
2854 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2857 * The copy_file_range function was added.
2859 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2861 * The ldconfig utility now processes `include' directives using the C/POSIX
2862 collation ordering. Previous glibc versions used locale-specific
2863 ordering, the change might break systems that relied on that.
2865 * Support for two grammatical forms of month names has been added.
2866 In a call to strftime, the "%B" and "%b" format specifiers will now
2867 produce the grammatical form required when the month is used as part
2868 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2869 required when the month is named by itself. For instance, in Greek
2870 and in many Slavic and Baltic languages, "%B" will produce the month
2871 in genitive case, and "%OB" will produce the month in nominative case.
2873 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2874 are all valid and will all accept any known form of month
2875 name---standalone or complete, abbreviated or full. In a call to
2876 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2877 the strings used by "%B" and "%b", respectively. New query
2878 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2879 used by "%OB" and "%Ob", respectively.
2881 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2882 define the strings for %OB and %Ob, respectively; these have the
2883 same syntax as "mon" and "abmon". These arrays are optional; if they
2884 are not provided then they have the same content as "mon" and "abmon",
2887 These features are provided for locales which define "alt_mon" and/or
2888 "ab_alt_mon" in their locale source data. This release includes such
2889 alternative month name data for the following languages: Belarusian,
2890 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2892 This feature is currently a GNU extension, but it is expected to
2893 be added to the next revision of POSIX, and it is also already
2894 available on some BSD-derived operating systems.
2896 This feature will cause existing statically compiled applications
2897 to fail to load locales and fall back to the builtin C/POSIX locales.
2898 See notes below for other changes affecting compatibility.
2900 * Support for the RISC-V ISA running on Linux has been added. This port
2901 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2902 for the following ISA and ABI pairs:
2908 Deprecated and removed features, and other changes affecting compatibility:
2910 * Statically compiled applications attempting to load locales compiled for the
2911 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2912 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2913 support for two grammatical forms of the month names, also extends the locale
2914 data binary format. Static applications needing locale support must be
2915 recompiled to match the runtime and data they are deployed with. In some
2916 distributions there is an upgrade window where dynamically linked applications
2917 may use a new library but the old locale data and also fall back to the
2918 builtin C/POSIX locales; restarting the application process is sufficient to
2921 * Support for statically linked applications which call dlopen is deprecated
2922 and will be removed in a future version of glibc. Applications which call
2923 dlopen need to be linked dynamically instead.
2925 * Support for old programs which use internal stdio data structures and
2926 functions is deprecated. This includes programs which use the C++ streams
2927 provided by libstdc++ in GCC 2.95. Programs which use the internal
2928 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2929 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2930 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2931 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2932 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2933 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2934 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2935 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2936 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2937 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2938 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2939 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2940 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2941 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2942 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2943 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2944 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2945 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2946 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2947 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2948 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2949 future version of glibc. Unlike other symbol removals, these old
2950 applications will not be supported using compatibility symbols.
2952 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2953 defined by <sys/ptrace.h>.
2955 * libm no longer supports SVID error handling (calling a user-provided
2956 matherr function on error) or the _LIB_VERSION variable to control error
2957 handling. (SVID error handling and the _LIB_VERSION variable still work
2958 for binaries linked against older versions of the GNU C Library.) The
2959 libieee.a library is no longer provided. math.h no longer defines struct
2960 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2961 TLOSS, PLOSS and HUGE.
2963 * The libm functions pow10, pow10f and pow10l are no longer supported for
2964 new programs. Programs should use the standard names exp10, exp10f and
2965 exp10l for these functions instead.
2967 * The mcontext_t type is no longer the same as struct sigcontext. On
2968 platforms where it was previously the same, this changes the C++ name
2969 mangling for interfaces involving this type.
2971 * The add-ons mechanism for building additional packages at the same time as
2972 glibc has been removed. The --enable-add-ons configure option is now
2975 * The --without-fp configure option is now ignored. Whether hardware
2976 floating-point instructions are used is now configured based on whether
2977 the compiler used at configure time (without any options implied by a
2978 --with-cpu= configure option) uses such instructions.
2980 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2981 the specified string can be parsed as a domain name.
2983 * In the malloc_info output, the <heap> element may contain another <aspace>
2984 element, "subheaps", which contains the number of sub-heaps.
2986 * The libresolv function p_secstodate is no longer supported for new
2989 * The tilepro-*-linux-gnu configuration is no longer supported.
2991 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2992 and will be removed in a future release. Software that is still using
2993 either header should be updated to use standard <stdio.h> interfaces
2996 libio.h was originally the header for a set of supported GNU extensions,
2997 but they have not been maintained as such in many years, they are now
2998 standing in the way of improvements to stdio, and we don't think there are
2999 any remaining external users. _G_config.h was never intended for public
3000 use, but predates the bits convention.
3002 Changes to build and runtime requirements:
3004 * bison version 2.7 or later is required to generate code in the 'intl'
3007 Security related changes:
3009 CVE-2009-5064: The ldd script would sometimes run the program under
3010 examination directly, without preventing code execution through the
3011 dynamic linker. (The glibc project disputes that this is a security
3012 vulnerability; only trusted binaries must be examined using the ldd
3015 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
3016 suffered from a one-byte overflow during ~ operator processing (either
3017 on the stack or the heap, depending on the length of the user name).
3018 Reported by Tim Rühsen.
3020 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
3021 would sometimes fail to free memory allocated during ~ operator
3022 processing, leading to a memory leak and, potentially, to a denial
3025 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
3026 without GLOB_NOESCAPE, could write past the end of a buffer while
3027 unescaping user names. Reported by Tim Rühsen.
3029 CVE-2017-17426: The malloc function, when called with an object size near
3030 the value SIZE_MAX, would return a pointer to a buffer which is too small,
3031 instead of NULL. This was a regression introduced with the new malloc
3032 thread cache in glibc 2.26. Reported by Iain Buclaw.
3034 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
3035 to the allocation of too much memory. (This is not a security bug per se,
3036 it is mentioned here only because of the CVE assignment.) Reported by
3039 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
3040 of the number of search path components. (This is not a security
3041 vulnerability per se because no trust boundary is crossed if the fix for
3042 CVE-2017-1000366 has been applied, but it is mentioned here only because
3043 of the CVE assignment.) Reported by Qualys.
3045 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
3046 for AT_SECURE or SUID binaries could be used to load libraries from the
3049 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
3050 succeeds without returning an absolute path due to unexpected behaviour
3051 of the Linux kernel getcwd syscall. Reported by halfdog.
3053 CVE-2018-6485: The posix_memalign and memalign functions, when called with
3054 an object size near the value of SIZE_MAX, would return a pointer to a
3055 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
3057 CVE-2018-6551: The malloc function, when called with an object size near
3058 the value of SIZE_MAX, would return a pointer to a buffer which is too
3059 small, instead of NULL.
3061 The following bugs are resolved with this release:
3063 [866] glob: glob should match dangling symlinks
3064 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
3065 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
3067 [5997] math: Very slow execution of sinf function
3068 [10580] localedata: hr_HR: updated locale
3069 [10871] locale: 'mon' array should contain both nominative and genitive
3071 [12349] localedata: eu_ES: incorrect thousands separator
3072 [13605] localedata: shn_MM: new Shan locale
3073 [13805] localedata: ru_RU: currency should use ',' as radix point
3074 [13953] localedata: km_KH: locale update
3075 [13994] localedata: mjw_IN: new locale
3076 [14121] build: make writes .mo files in po directory
3077 [14333] libc: Fix the race between atexit() and exit()
3078 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
3079 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
3081 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
3082 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
3083 width Latin characters
3084 [15332] localedata: es_CU: locale update
3085 [15436] stdio: Don't close or flush stdio streams on abort
3086 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
3088 [16148] localedata: ca_ES: incorrect thousands separator
3089 [16750] dynamic-link: ldd should not try to execute the binaries
3091 [16777] localedata: pl_PL: incorrect thousands separator in locale
3092 [16905] localedata: hanzi: new collation
3093 [17563] localedata: cmn_TW: add hanzi collation
3094 [17750] localedata: wrong collation order of diacritics in most locales
3095 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
3097 [17956] build: Build fails on missing definitions from header file
3098 nss/nss.h when Mozilla NSS is used for cryptography
3099 [18203] libc: realpath() does not handle unreachable paths correctly
3100 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
3101 [18812] localedata: kab_DZ: new Kabyle Algeria locale
3102 [18822] libc: Internal functions are called via PLT
3103 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
3104 [19170] libc: __gmon_start__ defined in hppa in crtn.S
3105 [19574] libc: glibc should support building static PIE binaries
3106 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
3108 [19971] glob: glob: Do not skip entries with zero d_ino values
3109 [19982] localedata: fr.po: spelling mistake for error code EXDEV
3110 [20008] localedata: km_KH: convert to translit_neutral
3111 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
3112 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
3113 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
3114 [20482] localedata: de_CH: abbreviated weekdays should be two letters
3115 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
3117 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
3118 they're set, wrong errors returned by gaih_inet when lookup functions
3120 [20756] localedata: [PATCH] Use Unicode wise thousands separator
3121 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
3123 [20952] localedata: yuw_PG: new locale
3124 [21084] localedata: charmaps/IBM858: new codepage
3125 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
3126 [21242] libc: assert gives pedantic warning in old gcc versions
3127 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
3128 __regcall calling convention
3129 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3130 [21326] libc: C99 functions are not declared for C++11 and later if
3131 _GNU_SOURCE is not predefined by g++
3132 [21457] libc: sys/ucontext.h namespace
3133 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3134 [21660] math: GCC fails to compile a formula with tgmath.h
3135 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3136 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3137 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3138 [21684] math: tgmath.h handling of complex integers
3139 [21685] math: tgmath.h handling of bit-fields
3140 [21686] math: tgmath.h handling of __int128
3141 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3143 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3145 [21750] localedata: column width of characters incompatible with classical
3147 [21754] malloc: malloc: Perform as little work as possible after heap
3148 consistency check failures
3149 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3150 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3151 [21791] string: Unused XXX_chk_XXX functions in libc.a
3152 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3154 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3156 [21845] localedata: Added new Locale bho_NP
3157 [21853] localedata: Fix abday Which looks same as day in zh_SG
3158 [21854] localedata: Added New Locale en_SC
3159 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3160 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3161 _dl_runtime_resolve_avx_slow
3162 [21885] network: getaddrinfo: gethosts does not release resolver context
3163 on memory allocation failure
3164 [21899] libc: XPG4.2 sigaction namespace
3165 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3167 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3169 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3170 errno value, causing getaddrinfo to fail
3171 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3172 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3173 instead of EAI_NODATA
3174 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3175 constant PTRACE_SEIZE_DEVEL
3176 [21930] math: C-only gcc builtins used in <math.h> isinf
3177 [21932] network: Unpaired __resolv_context_get in generic get*_r
3179 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3180 [21944] libc: sigval namespace
3181 [21951] localedata: Update hanzi collation by stroke
3182 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3183 sysdeps/x86_64/fpu/e_expf.S
3184 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3185 allocation in syscall loops)
3186 [21959] localedata: Fix Country name for xh_ZA
3187 [21960] localedata: Fix abmon for bem_ZM
3188 [21966] math: AVX2 mathvec functions use FMA without checking
3189 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3190 [21971] localedata: Added New Locale for mfe_MU
3191 [21972] libc: assert macro requires operator== (int) for its argument type
3192 [21973] math: [sparc] libm missing sqrtl compat symbol
3193 [21974] libc: Remove __bb_init_func and __bb_exit_func
3194 [21982] string: stratcliff.c: error: assuming signed overflow does not
3196 [21986] stdio: __guess_grouping is called incorrectly
3197 [21987] math: [sparc32] wrong bits/long-double.h installed
3198 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3200 [22022] localedata: Missing country_name for mni_IN
3201 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3203 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3205 [22026] locale: iconv_open: heap overflow on gconv_init failure
3206 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3207 [22035] math: [m68k] bits/math-inline.h macro namespace
3208 [22038] localedata: Fix abbreviated weeks and months for Somali
3209 [22044] localedata: Remove redundant data for Limburgish Language
3210 [22050] malloc: Linking with -lmcheck does not hook
3211 __malloc_initialize_hook correctly
3212 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3213 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3214 [22070] localedata: charmaps/UTF-8: wcwidth for
3215 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3216 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3217 Jungseong and Jongseong) should be 0
3218 [22078] nss: nss_files performance issue in multi mode
3219 [22082] math: bits/math-finite.h exp10 condition
3220 [22086] libc: pcprofiledump incorrect cross-endian condition
3221 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3222 [22095] network: Name server address allocation memory leak in resolv.conf
3224 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3226 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3227 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3229 [22111] malloc: malloc: per thread cache is not returned when thread exits
3230 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3231 [22134] libc: [linux] implement fexecve with execveat
3232 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3234 [22145] libc: ttyname() gives up too early in the face of namespaces
3235 [22146] math: C++ build issue with float128 on x86_64
3236 [22153] nptl: nptl: save error code before process termination
3237 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3238 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3239 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3240 [22165] libc: [hppa] Text relocations in libc.so
3241 [22180] libc: destructor registered via __cxa_atexit is called twice
3242 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3243 symlinks") cause "make" segfaults
3244 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3246 [22207] libc: FAIL: stdlib/test-atexit-race
3247 [22225] math: nearbyint arithmetic moved before feholdexcept
3248 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3249 [22235] math: iscanonical in C++ and float128
3250 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3251 the svid compat wrapper
3252 [22244] math: ynf and yn are wrong without the svid compat wrapper
3253 [22273] libc: Improper assert in Linux posix_spawn implementation
3254 [22284] libc: -pg -pie doesn't work
3255 [22292] locale: localedef exits with error 4 when it should be error 1
3256 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3257 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3259 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3260 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3262 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3263 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3264 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3265 [22322] libc: [mips64] wrong bits/long-double.h installed
3266 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3267 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3269 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3270 [22343] malloc: Integer overflow in posix_memalign
3271 [22347] libc: getrandom() returns the number of bytes that were copied to
3272 the buffer even though the comments say "Return 0 on success and -1 on
3274 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3275 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3277 [22370] dynamic-link: Incorrect note padding check
3278 [22375] libc: malloc returns pointer from tcache_get when should return
3279 NULL (CVE-2017-17426)
3280 [22377] math: iseqsig, float128 and C++
3281 [22382] localedata: Error in tpi_PG locale
3282 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3283 inside the ASCII printable range
3284 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3286 [22403] localedata: Slash needs escaping in some locales
3287 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3288 [22409] network: res_hnok does not accept some host names used on the
3290 [22412] network: res_dnok, res_hnok should perform syntax checks
3291 [22413] network: ns_name_pton ignores syntactically invalid trailing
3293 [22415] stdio: setvbuf can lead to invalid free/segfault
3294 [22432] build: Non-deterministic build
3295 [22439] malloc: malloc_info should compute summary statistics for all sub-
3297 [22442] network: if_nametoindex could report index for the wrong
3298 networking interface
3299 [22446] build: aliasing violation calling readlink in handle_request
3300 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3301 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3302 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3303 __nscd_hash/__nss_hash
3304 [22463] network: p_secstodate overflow handling
3305 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3306 [22478] libc: sigwait can fail with EINTR
3307 [22505] libc: ldconfig processes include directive in locale-specific
3309 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3310 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3311 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3312 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3313 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3314 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3315 same as for Croatian
3316 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3317 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3318 [22577] libc: missing newline after "cannot allocate TLS data structures
3320 [22588] manual: manual/conf.texi: missing underscore in front of
3322 [22593] math: nextafter and nexttoward are declared with const attribute
3323 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3324 [22603] string: ia64 memchr overflows internal pointer check
3325 [22605] libc: SH clone does not set the exit code correctly
3326 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3328 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3329 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3330 modified in case of success
3331 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3332 [22615] manual: manual: ambiguous wording about errno value in case of
3334 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3336 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3337 binaries or if /proc is not mounted (CVE-2017-16997)
3338 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3339 [22630] build: $(no-pie-ldflag) is no longer effective
3340 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3341 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3342 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3343 [22637] nptl: guard size is subtracted from thread stack size instead of
3345 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3346 [22657] localedata: hu_HU: Avoid double space in date
3347 [22660] math: fmax, fmin sNaN handling on alpha
3348 [22664] libc: New warning of GCC8
3349 [22665] math: alpha: ceil and floor raise inexact exceptions
3350 [22666] math: alpha: trunc raise inexact exceptions
3351 [22667] libc: makecontext lacks stack alignment on i386
3352 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3353 [22679] libc: getcwd(3) can succeed without returning an absolute path
3355 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3356 elision and tunables
3357 [22687] math: [powerpc-nofpu] complex long double functions spurious
3359 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3360 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3361 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3363 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3364 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3366 [22701] nis: Incomplete removal of libnsl
3367 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3368 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3369 [22715] dynamic-link: FAIL: elf/tst-audit10
3370 [22719] libc: Backtrace tests fail on hppa
3371 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3372 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3373 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3374 before the first call to crypt_r () in crypt/badsalttest.c
3381 * A per-thread cache has been added to malloc. Access to the cache requires
3382 no locks and therefore significantly accelerates the fast path to allocate
3383 and free small amounts of memory. Refilling an empty cache requires locking
3384 the underlying arena. Performance measurements show significant gains in a
3385 wide variety of user workloads. Workloads were captured using a special
3386 instrumented malloc and analyzed with a malloc simulator. Contributed by
3387 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3389 * Unicode 10.0.0 Support: Character encoding, character type info, and
3390 transliteration tables are all updated to Unicode 10.0.0, using
3391 generator scripts contributed by Mike FABIAN (Red Hat).
3392 These updates cause user visible changes, especially the changes in
3393 wcwidth for many emoji characters cause problems when emoji sequences
3394 are rendered with pango, see for example:
3395 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3397 * Collation of Hungarian has been overhauled and is now consistent with "The
3398 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3401 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3403 - The GNU C Library will now detect when /etc/resolv.conf has been
3404 modified and reload the changed configuration. The new resolver option
3405 “no-reload” (RES_NORELOAD) disables this behavior.
3407 - The GNU C Library now supports an arbitrary number of search domains
3408 (configured using the “search” directive in /etc/resolv.conf);
3409 previously, there was a hard limit of six domains. For backward
3410 compatibility, applications that directly modify the ‘_res’ global
3411 object are still limited to six search domains.
3413 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3414 Library will now randomly pick a name server from the configuration as a
3415 starting point. (Previously, the second name server was always used.)
3417 * The tunables feature is now enabled by default. This allows users to tweak
3418 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3420 * New function reallocarray, which resizes an allocated block (like realloc)
3421 to the product of two sizes, with a guaranteed clean failure upon integer
3422 overflow in the multiplication. Originally from OpenBSD, contributed by
3423 Dennis Wölfing and Rüdiger Sonderfeld.
3425 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3426 These are extended versions of preadv and pwritev, respectively, taking an
3427 additional flags argument. The set of supported flags depends on the
3428 running kernel; full support currently requires kernel 4.7 or later.
3430 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3431 create a new session ID for the spawned process. This feature is
3432 scheduled to be added to the next major revision of POSIX; for the time
3433 being, it is available under _GNU_SOURCE.
3435 * errno.h is now safe to use from C-preprocessed assembly language on all
3436 supported operating systems. In this context, it will only define the
3437 Exxxx constants, as preprocessor macros expanding to integer literals.
3439 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3440 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3441 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3442 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3444 To compile programs that use this feature, the compiler must support
3445 128-bit floating point with the type name _Float128 (as defined by TS
3446 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3447 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3448 must be defined to make the new interfaces visible.
3450 The new functions and macros correspond to those present for other
3451 floating-point types (except for a few obsolescent interfaces not
3452 supported for the new type), with F128 or f128 suffixes; for example,
3453 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3454 printf or scanf formats for the new type; the strfromf128 and strtof128
3455 interfaces should be used instead.
3457 Deprecated and removed features, and other changes affecting compatibility:
3459 * The synchronization that pthread_spin_unlock performs has been changed to
3460 now be equivalent to a C11 atomic store with release memory order to the
3461 spin lock's memory location. Previously, several (but not all)
3462 architectures used stronger synchronization (e.g., containing what is
3463 often called a full barrier). This change can improve performance, but
3464 may affect odd fringe uses of spin locks that depend on the previous
3465 behavior (e.g., using spin locks as atomic variables to try to implement
3466 Dekker's mutual exclusion algorithm).
3468 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3471 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3472 will only be built and installed when the GNU C Library is configured with
3473 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3474 as TIRPC or rpcsvc-proto, to be used.
3476 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3477 libnss_compat, are deprecated, and will not be built or installed by
3480 The NIS(+) support library, libnsl, is also deprecated. By default, a
3481 compatibility shared library will be built and installed, but not headers
3482 or development libraries. Only a few NIS-related programs require this
3483 library. (In particular, the GNU C Library has never required programs
3484 that use 'gethostbyname' to be linked with libnsl.)
3486 Replacement implementations based on TIRPC, which additionally support
3487 IPv6, are available from <https://github.com/thkukuk/>. The configure
3488 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3489 name service modules, to be built and installed.
3491 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3492 support is enabled, the configured recursive resolver must support EDNS.
3493 (Responding to EDNS-enabled queries with responses which are not
3494 EDNS-enabled is fine, but FORMERR responses are not.)
3496 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3497 servers have not supported this opcode for a long time.
3499 * The _res_opcodes variable has been removed from libresolv. It had been
3500 exported by accident.
3502 * <string.h> no longer includes inline versions of any string functions,
3503 as this kind of optimization is better done by the compiler. The macros
3504 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3506 * The nonstandard header <xlocale.h> has been removed. Most programs should
3507 use <locale.h> instead. If you have a specific need for the definition of
3508 locale_t with no other declarations, please contact
3509 libc-alpha@sourceware.org and explain.
3511 * The obsolete header <sys/ultrasound.h> has been removed.
3513 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3515 * The obsolete function cfree has been removed. Applications should use
3518 * The stack_t type no longer has the name struct sigaltstack. This changes
3519 the C++ name mangling for interfaces involving this type.
3521 * The ucontext_t type no longer has the name struct ucontext. This changes
3522 the C++ name mangling for interfaces involving this type.
3524 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3525 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3526 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3527 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3528 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3529 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3530 fpregset_t type no longer has the name struct fpu. This changes the C++
3531 name mangling for interfaces involving those types.
3533 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3534 synced with the kernel:
3536 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3537 are not supported on this architecture and have been removed.
3539 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3540 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3541 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3543 Programs that assume the GET/SETREGS ptrace requests are universally
3544 available will now fail to build, instead of malfunctioning at runtime.
3546 Changes to build and runtime requirements:
3548 * Linux kernel 3.2 or later is required at runtime, on all architectures
3549 supported by that kernel. (This is a change from version 2.25 only for
3552 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3554 * On most architectures, GCC 4.9 or later is required to build the GNU C
3555 Library. On powerpc64le, GCC 6.2 or later is required.
3557 Older GCC versions and non-GNU compilers are still supported when
3558 compiling programs that use the GNU C Library. (We do not know exactly
3559 how old, and some GNU extensions to C may be _de facto_ required. If you
3560 are interested in helping us make this statement less vague, please
3561 contact libc-alpha@sourceware.org.)
3563 Security related changes:
3565 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3566 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3568 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3569 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3571 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3572 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3575 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3576 fixed (CVE-2017-12133).
3578 The following bugs are resolved with this release:
3580 [984] network: Respond to changed resolv.conf in gethostbyname
3581 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3582 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3584 [12189] libc: __stack_chk_fail should not attempt a backtrace
3586 [14096] time: Race condition on timezone/tst-timezone.out
3587 [14172] localedata: az_IR: new locale
3588 [14995] build: glibc fails to build if gold is the default linker, even if
3590 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3591 [16637] network: inet_pton function is accepting IPv6 with bad format
3592 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3593 x86 and other generic code
3594 [16875] localedata: ko_KR: fix lang_name
3595 [17225] localedata: ar_SY: localized month names for May and June are
3597 [17297] localedata: da_DK: wrong date_fmt string
3598 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3599 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3600 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3601 [19066] localedata: ar_SA abbreviated day and month names are in English
3602 [19569] network: resolv: Support an arbitrary number of search domains
3603 [19570] network: Implement random DNS server selection in the stub
3605 [19838] locale: localedef fails on PA-RISC
3606 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3607 order of 0D36 and 0D37
3608 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3610 [20098] libc: FAIL: debug/backtrace-tst on hppa
3611 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3613 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3615 [20313] localedata: Update locale data to Unicode 9.0
3616 [20424] manual: Document how to provide a malloc replacement
3617 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3619 [20686] locale: Add el_GR@euro to SUPPORTED.
3620 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3621 failures consistently
3622 [21015] dynamic-link: Document and fix --enable-bind-now
3623 [21016] nptl: pthread_cond support is broken on hppa
3624 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3625 frame-pointer on i386
3626 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3628 [21075] libc: unused assignment to %g4 in sparc/sparc{64,32}/clone.S
3629 [21088] libc: Build fails with --enable-static-nss
3630 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3631 generic c code is used
3632 [21109] libc: Tunables broken on big-endian
3633 [21112] math: powf has large ulp errors with base close to 1 and exponent
3635 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3637 [21120] malloc: glibc malloc is incompatible with GCC 7
3638 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3640 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3641 (-0.0) when linking with -lieee
3642 [21171] math: log10, log2 and lgamma return incorrect results
3643 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3644 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3645 [21207] localedata: ce_RU: update weekdays from CLDR
3646 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3647 [21217] localedata: Update months from CLDR-31
3648 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3649 [21243] libc: support_delete_temp_file should issue warning for failed
3651 [21244] libc: support resolv_test_start() socket fd close should be
3653 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3654 new posix_spawn implementation
3655 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3656 leads to lower CPU frequency
3657 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3658 [21261] libc: [sparc64] bits/setjmp.h namespace
3659 [21267] network: [mips] bits/socket.h IOC* namespace
3660 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3661 [21270] libc: mmap64 silently truncates large offset values
3662 [21275] libc: posix_spawn always crashes on ia64 now
3663 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3664 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3665 [21289] libc: Incorrect declaration for 32-bit platforms with
3666 _FILE_OFFSET_BITS=64 causes build error
3667 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3668 not support gethostbyname4_r
3669 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3671 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3673 [21340] libc: Support POSIX_SPAWN_SETSID
3674 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3675 [21359] network: ns_name_pack needs additional byte in destination buffer
3676 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3677 against fragmentation attacks (CVE-2017-12132)
3678 [21369] network: resolv: Remove EDNS fallback
3679 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3681 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3682 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3683 [21393] stdio: Missing dup3 error check in freopen, freopen64
3684 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3685 [21399] localedata: Bad description for U00EC in
3686 localedata/charmaps/CP1254
3687 [21411] malloc: realloc documentation error
3688 [21426] network: sys/socket.h uio.h namespace
3689 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3690 [21445] libc: signal.h bsd_signal namespace
3691 [21455] network: Network headers stdint.h namespace
3692 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3694 [21475] network: resolv: Overlong search path is truncated mid-label
3695 [21511] libc: sigstack namespace
3696 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3697 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3698 bits/syscall.h: No such file or directory
3699 [21517] libc: struct sigaltstack namespace
3700 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3701 [21533] localedata: Update locale data to Unicode 10.0
3703 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3704 junk at end of line, first unrecognized character is `@'
3705 [21538] libc: SIG_HOLD missing for XPG4
3706 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3707 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3708 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3709 [21543] libc: sigevent namespace
3710 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3711 size for general purpose registers in mcontext_t structure
3712 [21550] libc: sigwait namespace
3713 [21552] libc: XPG4 bsd_signal namespace
3714 [21554] libc: sigpause namespace
3715 [21560] libc: sys/wait.h signal.h namespace
3716 [21561] libc: waitid namespace
3717 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3718 '/usr/include/stdlib.h': Permission denied
3719 [21575] libc: sys/wait.h missing struct rusage definition
3720 [21584] libc: sigaltstack etc namespace
3721 [21597] libc: siginterrupt namespace
3722 [21607] math: hppa: FAIL: math/test-tgmath
3723 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3725 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3726 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3727 stack and heap (CVE-2017-1000366)
3728 [21625] libc: wait3 namespace
3729 [21654] nss: Incorrect pointer alignment in NSS group merge result
3731 [21657] network: Parse interface zone id for node-local multicast
3732 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3734 [21666] libc: .symver is used on common symbol
3735 [21668] network: resolv: res_init cross-thread broadcast introduces race
3737 [21687] math: tgmath.h totalorder, totalordermag return type
3738 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3740 [21696] libc: Incorrect assumption of of __cpu_mask in
3741 posix/sched_cpucount.c
3742 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3743 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3745 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3746 leading to relocation crash
3747 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3748 `resolv_conf_matches (resp, conf)' failed.
3749 [21710] localedata: Added Samoan language locale for Samoa
3750 [21711] localedata: Pashto yesstr/nostr locale are missing
3751 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3752 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3753 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3754 [21723] localedata: yesstr/nostr missing for Chinese language locale
3755 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3757 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3759 [21728] localedata: New Locale for Tongan language
3760 [21729] localedata: incorrect LC_NAME fields for hi_IN
3761 [21733] localedata: yesstr and nostr are missing for zh_HK
3762 [21734] localedata: Missing yesstr and nostr are for kw_GB
3763 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3764 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3765 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3766 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3768 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3770 [21749] localedata: Wrong abbreviated day name (“abday”) for
3772 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3773 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3774 [21759] localedata: missing yesstr and nostr for Tigrinya
3775 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3776 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3777 [21767] localedata: Missing Bislama locales
3778 [21768] localedata: Missing yesstr and nostr for aa_ET
3779 [21770] localedata: Missing Field in li_NL
3780 [21778] nptl: Robust mutex may deadlock
3781 [21779] libc: MicroBlaze segfaults when loading libpthread
3782 [21783] localedata: Fix int_select international_call_prefixes
3783 [21784] localedata: Inconsistency in country_isbn
3784 [21788] localedata: Missing Country Postal Abbreviations
3785 [21794] localedata: Added-country_isbn-for-Italy
3786 [21795] localedata: Add/Fix country_isbn for France
3787 [21796] localedata: Added country_isbn for Republic of Korea
3788 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3789 [21799] localedata: Added int_select international_call_prefixes
3790 [21801] localedata: Added int_select international_call_prefixes
3791 [21804] nptl: Double semicolon in thread-shared-types.h
3792 [21807] localedata: LC_ADDRESS fix for pap_CW
3793 [21808] localedata: Fix LC_ADDRESS for pap_AW
3794 [21821] localedata: Added country_name in mai_IN
3795 [21822] localedata: Fix LC_TIME for mai_IN
3796 [21823] localedata: missing yesstr, nostr for sa_IN
3797 [21825] localedata: Fix name_mrs for mag_IN
3798 [21828] localedata: 2.26 changelog should mention user visible changes
3800 [21835] localedata: Added Maithili language locale for Nepal
3801 [21838] localedata: Removed redundant data for the_NP
3802 [21839] localedata: Fix LC_MONETARY for ta_LK
3803 [21844] localedata: Fix Latin characters and Months Sequence.
3804 [21848] localedata: Fix mai_NP Title Name
3809 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3810 24731-2:2010, is supported to enable declarations of functions from that
3811 TR. Note that not all functions from that TR are supported by the GNU C
3814 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3815 18661-1:2014, is supported to enable declarations of functions and macros
3816 from that TS. Note that not all features from that TS are supported by
3819 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3820 18661-4:2015, is supported to enable declarations of functions and macros
3821 from that TS. Note that most features from that TS are not supported by
3824 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3825 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3826 Since the GNU C Library defaults to a much newer revision of POSIX, this
3827 will only affect programs that specifically request an old conformance
3828 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3829 see a change in the visible declarations, but a program compiled with
3830 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3833 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3834 defined by all multithreaded code, but glibc has not required this for
3837 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3838 means that in a future release, the macros “major”, “minor”, and “makedev”
3839 will only be available from <sys/sysmacros.h>.
3841 These macros are not part of POSIX nor XSI, and their names frequently
3842 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3843 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3844 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3847 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3848 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3849 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3851 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3852 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3853 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3854 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3855 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3856 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3857 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3858 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3859 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3860 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3861 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3864 * New <math.h> features are added from TS 18661-1:2014:
3866 - Signaling NaN macros: SNANF, SNAN, SNANL.
3868 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3869 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3870 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3872 - llogb functions: the llogb, llogbf and llogbl functions, and the
3873 FP_LLOGB0 and FP_LLOGBNAN macros.
3875 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3878 - Comparison macros: iseqsig.
3880 - Classification macros: iscanonical, issubnormal, iszero.
3882 - Total order functions: totalorder, totalorderf, totalorderl,
3883 totalordermag, totalordermagf, totalordermagl.
3885 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3887 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3888 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3890 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3891 are added to libc. They convert a floating-point number into string.
3893 * Most of glibc can now be built with the stack smashing protector enabled.
3894 It is recommended to build glibc with --enable-stack-protector=strong.
3895 Implemented by Nick Alcock (Oracle).
3897 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3898 intended to be used instead of memset() to erase sensitive data after use;
3899 the compiler will not optimize out calls to explicit_bzero even if they
3900 are "unnecessary" (in the sense that no _correct_ program can observe the
3901 effects of the memory clear).
3903 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3904 to float instead of double. This does not affect the ABI of any libraries
3905 that are part of the GNU C Library, but may affect the ABI of other
3906 libraries that use this type in their interfaces.
3908 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3909 float_t and double_t types are now defined to long double instead of float
3910 and double. These options are not the default, and this does not affect
3911 the ABI of any libraries that are part of the GNU C Library, but it may
3912 affect the ABI of other libraries that use this type in their interfaces,
3913 if they are compiled or used with those options.
3915 * The getentropy and getrandom functions, and the <sys/random.h> header file
3918 * The buffer size for byte-oriented stdio streams is now limited to 8192
3919 bytes by default. Previously, on Linux, the default buffer size on most
3920 file systems was 4096 bytes (and thus remains unchanged), except on
3921 network file systems, where the buffer size was unpredictable and could be
3922 as large as several megabytes.
3924 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3925 for the Linux quota interface which predates kernel version 2.4.22 has
3928 * The malloc_get_state and malloc_set_state functions have been removed.
3929 Already-existing binaries that dynamically link to these functions will
3930 get a hidden implementation in which malloc_get_state is a stub. As far
3931 as we know, these functions are used only by GNU Emacs and this change
3932 will not adversely affect already-built Emacs executables. Any undumped
3933 Emacs executables, which normally exist only during an Emacs build, should
3934 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3936 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3937 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3938 “no-ip6-dotint” had already been the default, and support for the
3939 “ip6-dotint” option was removed from the Internet in 2006.
3941 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3942 flag from <resolv.h> have been removed. The option relied on a
3943 backwards-incompatible DNS extension which was never deployed on the
3946 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3947 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3948 They were already unimplemented.
3950 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3951 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3952 removed again from the IETF name lookup interface specification in RFC
3953 2553. Applications should use getaddrinfo instead.
3955 * DNSSEC-related declarations and definitions have been removed from the
3956 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3957 decode the data part of DNSSEC record types. Previous versions of glibc
3958 only implemented minimal support for the previous version of DNSSEC, which
3959 is incompatible with the currently deployed version.
3961 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3962 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3963 <arpa/nameser.h> header file because the distinction between RR types and
3964 meta-RR types is not officially standardized, subject to revision, and
3965 thus not suitable for encoding in a macro.
3967 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3968 and rhook members of the res_state type in <resolv.h> have been removed.
3969 The glibc stub resolver did not support these hooks, but the header file
3970 did not reflect that.
3972 * For multi-arch support it is recommended to use a GCC which has
3973 been built with support for GNU indirect functions. This ensures
3974 that correct debugging information is generated for functions
3975 selected by IFUNC resolvers. This support can either be enabled by
3976 configuring GCC with '--enable-gnu-indirect-function', or by
3977 enabling it by default by setting 'default_gnu_indirect_function'
3978 variable for a particular architecture in the GCC source file
3981 * GDB pretty printers have been added for mutex and condition variable
3982 structures in POSIX Threads. When installed and loaded in gdb these pretty
3983 printers show various pthread variables in human-readable form when read
3984 using the 'print' or 'display' commands in gdb.
3986 * Tunables feature added to allow tweaking of the runtime for an application
3987 program. This feature can be enabled with the '--enable-tunables' configure
3988 flag. The GNU C Library manual has details on usage and README.tunables has
3989 instructions on adding new tunables to the library.
3991 * A new version of condition variables functions have been implemented in
3992 the NPTL implementation of POSIX Threads to provide stronger ordering
3995 * A new version of pthread_rwlock functions have been implemented to use a more
3996 scalable algorithm primarily through not using a critical section anymore to
3999 Security related changes:
4001 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
4002 have been created with makecontext could fail to terminate due to a
4003 missing .cantunwind annotation. This has been observed to lead to a hang
4004 (denial of service) in some Go applications compiled with gccgo. Reported
4005 by Andreas Schwab. (CVE-2016-6323)
4007 * The DNS stub resolver functions would crash due to a NULL pointer
4008 dereference when processing a query with a valid DNS question type which
4009 was used internally in the implementation. The stub resolver now uses a
4010 question type which is outside the range of valid question type values.
4013 The following bugs are resolved with this release:
4015 [4099] stdio: Overly aggressive caching by stream i/o functions.
4016 [7065] build: Support building glibc with -fstack-protector or -fstack-
4018 [9842] localedata: en_CA: incorrect date format
4019 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
4020 before it started waiting
4021 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
4022 [15765] nptl: sem_open is wrongly a cancellation point
4023 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
4024 [16458] libc: endian.h and netinet/in.h byte order macros return values of
4026 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
4027 library linked with pthread
4028 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
4029 "FIXME: Ingo" issue)
4030 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
4031 [17252] libc: getrandom and getentropy syscall
4032 [17730] malloc: thread-local storage is sometimes improperly free()'d
4033 after being __libc_memalign()'d
4034 [18241] stdio: failed fseek on memstream does not set errno and can fail
4036 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
4038 [18463] nptl: pthread_cond_broadcast issue when surrounded by
4039 PTHREAD_PRIO_INHERIT mutex on ARM
4040 [18784] network: res_query and related function crash for special record
4041 type queries (CVE-2015-5180)
4042 [19380] math: strtod does not raise "inexact"
4043 [19387] string: Integer overflow in memchr
4044 [19390] string: Integer overflow in strncat
4045 [19398] build: linknamespace tests fail with massively parallel build
4046 [19402] nptl: Deadlock with robust shared mutex and asynchronous
4048 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
4049 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
4050 [19514] libc: [PATCH] Fix spelling errors in spelling
4051 "implement"/"implementation" in several places
4052 [19582] network: Deprecate RES_USE_INET6
4053 [19673] manual: clog10 docs appear to be erroneous
4054 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
4055 causes a segmentation fault
4056 [19826] libc: invalid pointer returned from __tls_get_addr with static
4058 [20016] network: resolv: Remove hooks support from the API
4059 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
4061 [20033] math: [x86_64] vectorized math function don't call the __finite
4063 [20116] nptl: use after free in pthread_create
4064 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
4065 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
4067 [20311] nptl: please install proc_service.h
4068 [20366] libc: Compilation errors in installed headers in strict-compliance
4070 [20370] malloc: malloc: Arena free list management is still racy
4071 (incorrect fix in bug 19243)
4072 [20386] libc: assert (X = 0) does not result in GCC warning
4073 [20432] malloc: malloc: Minimize interface required for interposition
4074 [20435] libc: Missing unwind info in __startcontext causes infinite loop
4075 in _Unwind_Backtrace (CVE-2016-6323)
4076 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
4077 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
4079 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
4080 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
4081 [20477] network: resolv: incorrect double-checked locking related to
4083 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
4085 [20495] math: x86_64 performance degradation due to AVX/SSE transition
4087 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
4088 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
4089 cause transition penalty
4090 [20517] math: sparcv9 missing fdiml compat symbol
4091 [20524] manual: strverscmp is inconsistent
4092 [20525] libc: <sys/quota.h> should be based on kernel headers
4093 [20539] math: GCC 7 -static -lm fails to link at -O3
4094 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
4096 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
4098 [20591] network: Remove obsolete DNSSEC support
4099 [20592] network: DNS resource record type classification macros in
4100 <arpa/nameser.h> are incorrect
4101 [20593] network: Update DNS RR type definitions
4102 [20611] network: getaddrinfo accepts invalid numeric scope IDs
4103 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
4105 [20629] network: libresolv: Remove support for bitstring labels
4107 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
4108 assertion: "maxidx >= 2"
4109 [20660] math: [arm] Use VSQRT
4110 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
4111 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
4112 [20689] libc: Test for FMA should also check for AVX.
4113 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
4114 [20715] math: iszero macro breaks existing code
4115 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
4116 [20728] libc: powerpc: Missing TOC stub in clone
4117 [20729] build: glibc-2.24 fails to build for i486 with -Os
4118 [20750] build: Build fails with default PIE enabled gcc-6.x
4119 [20768] math: [alpha] sqrt fegetenv namespace
4120 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
4122 [20787] math: float_t is defined as float incorrectly on x86_64 even if
4123 __FLT_EVAL_METHOD__ is 2
4124 [20790] network: rpcgen buffer overrun in get_prog_declaration
4125 [20822] nptl: race condition in __lll_unlock_elision on powerpc
4126 [20829] libc: crypt snprintf namespace
4127 [20847] libc: tst-vfork3 failure
4128 [20855] math: Default bits/mathdef.h has inappropriate float_t
4129 [20859] math: [sh4] FP_ILOGB0 invalid
4130 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4131 U+20AC), not same as GBK
4132 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4133 [20916] math: pow handling of sNaN arguments
4134 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4135 [20919] math: Bad pow (qNaN, 0) result with -lieee
4136 [20940] math: hypot sNaN handling
4137 [20947] math: fmax, fmin sNaN handling
4138 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4139 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4141 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4142 [20973] nptl: robust mutexes: Lost wake-ups
4143 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4144 [20978] nis: strlen on null pointer in nss_nisplus
4145 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4147 [21014] string: i686 memchr overflows internal pointer check
4148 [21019] libc: [mips] n32 lseek incorrect on overflow
4149 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4150 [21026] libc: [MIPS] readahead syscall is broken on n64
4151 [21028] math: Fallback fesetexceptflag should always succeed
4152 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4153 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4155 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4156 [21061] librt: [microblaze] librt lost clock_* exports
4157 [21073] libc: tunables: insecure environment variables passed to
4158 subprocesses with AT_SECURE
4159 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4163 * The minimum Linux kernel version that this version of the GNU C Library
4164 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4165 kernel version 2.6.32 or later suffices (on architectures that already
4166 required kernel versions more recent than 3.2, those requirements remain
4167 unchanged). Linux 3.2 or later kernel headers are required on all
4170 * The pap_AN locale has been deleted. This has been deprecated for a long
4171 time. It has been replaced by pap_AW & pap_CW, both of which have long
4172 been included in previous releases.
4174 * The readdir_r and readdir64_r functions have been deprecated. It is
4175 recommended to use readdir and readdir64 instead.
4177 * The type “union wait” has been removed. It was deprecated in the early
4178 1990s and never part of POSIX. Application code should use the int type
4179 instead of “union wait”.
4181 * A new NSS action is added to facilitate large distributed system
4182 administration. The action, MERGE, allows remote user stores like LDAP
4183 to be merged into local user stores like /etc/groups in order to provide
4184 easy to use, updated, and managed sets of merged credentials. The new
4185 action can be used by configuring it in /etc/nsswitch.conf:
4186 group: files [SUCCESS=merge] nis
4187 Implemented by Stephen Gallagher (Red Hat).
4189 * The deprecated __malloc_initialize_hook variable has been removed from the
4192 * The long unused localedef --old-style option has been removed. It hasn't
4193 done anything in over 16 years. Scripts using this option can safely
4196 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4197 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4198 return the next representable value in the direction of positive infinity
4199 and the nextdown functions return the next representable value in the
4200 direction of negative infinity. These are currently enabled as GNU
4203 Security related changes:
4205 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4206 could result in a stack overflow when getnetbyname was called with an
4207 overly long name. (CVE-2016-3075)
4209 * Previously, getaddrinfo copied large amounts of address data to the stack,
4210 even after the fix for CVE-2013-4458 has been applied, potentially
4211 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4212 instead. Reported by Michael Petlan. (CVE-2016-3706)
4214 * The glob function suffered from a stack-based buffer overflow when it was
4215 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4216 Reported by Alexander Cherepanov. (CVE-2016-1234)
4218 * The Sun RPC UDP client could exhaust all available stack space when
4219 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4220 alloca plugin for GCC. (CVE-2016-4429)
4222 * The IPv6 name server management code in libresolv could result in a memory
4223 leak for each thread which is created, performs a failing naming lookup,
4224 and exits. Over time, this could result in a denial of service due to
4225 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4227 The following bugs are resolved with this release:
4229 [1170] localedata: ne_NP: update Nepali locale definition file
4230 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4232 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4233 [6796] math: fdim() does not set errno on overflow
4234 [10354] libc: posix_spawn should use vfork() in more cases than presently
4235 [11213] localedata: localedata: add copyright disclaimer to locale files
4236 [12143] localedata: chr_US: new Cherokee locale
4237 [12450] localedata: sgs_LT: new locale
4238 [12676] localedata: ln_CD: new locale
4239 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4241 [13304] math: fma, fmaf, fmal produce wrong results
4242 [14259] build: --localedir arg to configure is ignored
4243 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4244 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4245 [14934] localedata: es_CL: wrong first weekday chilean locale
4246 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4248 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4250 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4251 [15368] nptl: raise() is not async-signal-safe
4252 [15479] math: ceil, floor, round and trunc raise inexact exception
4253 [15578] localedata: kk_KZ: various updates
4254 [16003] localedata: pap_AN: punt old locale
4255 [16137] localedata: iw_IL: punt old locale
4256 [16190] localedata: eo: new esperanto locale
4257 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4258 [16742] malloc: race condition: pthread_atfork() called before first
4259 malloc() results in unexpected locking behaviour/deadlocks
4260 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4262 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4263 [17565] localedata: pt_PT: wrong (work-)week start
4264 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4265 [17950] build: Build fails with -msse
4266 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4267 [18433] libc: posix_spawn does not return correctly upon failure to
4269 [18453] localedata: charmaps/IBM875: incorrect codes
4270 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4272 [18896] localedata: he_IL: improvements for currency
4273 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4274 Romanian locale data
4275 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4277 [19056] libc: Deprecate readdir_r
4278 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4280 [19198] localedata: nl_NL: small improvements for Dutch locales
4281 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4282 nameservers (CVE-2016-5417)
4283 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4285 [19400] locale: Language missing in "iso-639.def", trivial fix in
4287 [19431] malloc: Deadlock between fflush, getdelim, and fork
4288 [19505] libc: Incorrect file descriptor validity checks in
4289 posix_spawn_file_actions_add{open,close,dup2}
4290 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4291 when using RTLD_NEXT
4292 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4293 `intl/{gettextP,loadinfo}.h'
4294 [19534] libc: execle, execlp may use malloc
4295 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4296 [19573] network: res_nclose and __res_maybe_init disagree about name
4297 server initialization, breaking Hesiod
4298 [19575] localedata: Status of GB18030 tables
4299 [19581] localedata: sr_* date_fmt string contains additional newline
4300 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4302 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4303 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4304 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4305 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4307 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4309 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4311 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4312 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4313 [19633] locale: strfmon_l applies global locale to number formatting
4314 [19642] network: Memory leak in getnameinfo
4315 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4316 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4318 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4319 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4321 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4322 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4324 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4326 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4328 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4329 pointers and lengths in error-case.
4330 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4331 report errors on UTF-16 surrogates values.
4332 [19755] nscd: nscd assertion failure in gc
4333 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4334 [19759] libc: mempcpy shouldn't be inlined
4335 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4336 [19765] libc: s390 needs an optimized mempcpy
4337 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4338 NAME_MAX limit assumption (CVE-2016-1234)
4339 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4340 [19787] network: Missing and incorrect truncation checks in getnameinfo
4341 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4343 [19791] network: Assertion failure in res_query.c with un-connectable name
4345 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4346 [19822] math: libm.so install clobbers old version
4347 [19825] network: resolv: send_vc can return uninitialized data in second
4348 response to getaddrinfo
4349 [19830] network: nss_dns: should check RDATA length against buffer length
4350 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4351 confronted with A/AAAA records of invalid size
4352 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4353 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4354 [19853] stdio: Printing IBM long double in decimal with high precision is
4356 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4357 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4358 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4360 [19865] network: Assertion failure or memory leak in
4361 _nss_dns_getcanonname_r
4362 [19868] network: nss_dns: netent code does not skip over non-PTR records
4363 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4365 [19881] string: Improve x86-64 memset
4366 [19907] string: Incorrect memcpy tests
4367 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4369 [19925] libc: termios.h XCASE namespace
4370 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4371 [19929] libc: limits.h NL_NMAX namespace
4372 [19931] stdio: Memory leak in vfprintf
4373 [19957] libc: clone(CLONE_VM) access invalid parent memory
4374 [19963] localedata: en_IL: New locale
4375 [19989] stdio: stdio.h cuserid namespace
4376 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4378 [19996] locale: langinfo.h nl_langinfo_l namespace
4379 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4380 [20010] network: getaddrinfo: Stack overflow in hostent translation
4382 [20012] stdio: libio: fmemopen append mode failure
4383 [20014] stdio: stdio.h namespace for pre-threads POSIX
4384 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4385 [20023] libc: fcntl.h timespec namespace
4386 [20024] math: [x86_64] vectorized sincos trashes the stack
4387 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4388 [20041] time: sys/time.h timespec namespace
4389 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4390 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4391 [20051] libc: ttyslot in wrong header under wrong conditions
4392 [20054] libc: gethostname not declared for XPG4
4393 [20055] libc: termios.h missing tcgetsid for XPG4
4394 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4396 [20073] libc: sys/stat.h fchmod namespace
4397 [20074] libc: stdlib.h rand_r namespace
4398 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4399 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4401 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4402 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4404 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4405 [20119] libc: Wrong mask for processors level type from CPUID
4406 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4407 AS not supporting AVX512
4408 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4410 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4411 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4413 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4414 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4415 [20178] libc: posix_spawn{p} should not call exit
4416 [20191] stdio: libio: vtables hardening
4417 [20195] string: FMA4 detection requires CPUID execution with register
4419 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4420 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4422 [20212] math: acos (sNaN) returns sNaN
4423 [20213] math: asin (sNaN) returns sNaN
4424 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4425 [20218] math: [i386] asinhl (sNaN) returns sNaN
4426 [20219] math: [i386] atanhl (sNaN) returns sNaN
4427 [20222] stdio: fopencookie: Mangle function pointers
4428 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4429 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4430 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4432 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4433 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4434 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4435 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4436 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4437 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4438 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4439 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4440 [20240] math: modf (sNaN) returns sNaN
4441 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4442 [20250] math: frexp (sNaN) returns sNaN
4443 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4444 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4446 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4447 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4448 subscript is below array bounds [-Werror=array-bounds]
4449 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4450 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4452 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4453 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4455 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4456 "invalid" exceptions
4457 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4458 [20316] localedata: id_ID: Februari instead of Pebruari
4459 [20327] string: POWER8 strcasecmp returns incorrect result
4460 [20347] math: Failure: Test: j0_downward (0xap+0)
4461 [20348] libc: FAIL: misc/tst-preadvwritev64
4462 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4463 [20350] libc: There is no test for p{read,write}64
4464 [20357] math: Incorrect cos result for 1.5174239687223976
4465 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4469 * Unicode 8.0.0 Support: Character encoding, character type info, and
4470 transliteration tables are all updated to Unicode 8.0.0, using new
4471 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4472 These updates cause user visible changes, such as the fixes for bugs
4473 89, 16061, and 18568.
4475 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4476 kernel-internal CPU set size. This means that requests that change the
4477 CPU affinity which failed before (for example, an all-ones CPU mask) will
4478 now succeed. Applications that need to determine the effective CPU
4479 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4480 setting it because the kernel can adjust it (and the previous size check
4481 would not detect this in the majority of cases).
4483 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4484 the following new symbols are used: fts64_children, fts64_close,
4485 fts64_open, fts64_read and fts64_set.
4487 * getaddrinfo now detects certain invalid responses on an internal netlink
4488 socket. If such responses are received, an affected process will
4489 terminate with an error message of "Unexpected error <number> on netlink
4490 descriptor <number>" or "Unexpected netlink response of size <number> on
4491 descriptor <number>". The most likely cause for these errors is a
4492 multi-threaded application which erroneously closes and reuses the netlink
4493 file descriptor while it is used by getaddrinfo.
4495 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4496 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4497 unnecessary serialization of memory allocation requests across threads.
4498 The defect is now corrected. Users should see a substantial increase in
4499 the concurrent throughput of allocation requests for applications which
4500 trigger this bug. Affected applications typically create and
4501 destroy threads frequently. (Bug 19048 was reported and analyzed by
4504 * There is now a --disable-timezone-tools configure option for disabling the
4505 building and installing of the timezone related utilities (zic, zdump, and
4506 tzselect). This is useful for people who build the timezone data and code
4507 independent of the GNU C Library.
4509 * The obsolete header <regexp.h> has been removed. Programs that require
4510 this header must be updated to use <regex.h> instead.
4512 * The obsolete functions bdflush, create_module, get_kernel_syms,
4513 query_module and uselib are no longer available to newly linked binaries;
4514 the header <sys/kdaemon.h> has been removed. These functions and header
4515 were specific to systems using the Linux kernel and could not usefully be
4516 used with the GNU C Library on systems with version 2.6 or later of the
4519 * Optimized string, wcsmbs and memory functions for IBM z13.
4520 Implemented by Stefan Liebler.
4522 * Newly linked programs that define a variable called signgam will no longer
4523 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4524 require signgam to be set by those functions must ensure that they use the
4525 variable provided by the GNU C Library and declared in <math.h>, without
4526 defining their own copy.
4528 * The minimum GCC version that can be used to build this version of the GNU
4529 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4530 still be used to compile programs using the GNU C Library.
4532 Security related changes:
4534 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4535 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4537 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4538 the pointer guard feature. It is always enabled. Previously,
4539 LD_POINTER_GUARD could be used to disable security hardening in binaries
4540 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4543 * An integer overflow in hcreate and hcreate_r could lead to an
4544 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4546 * The catopen function no longer has unbounded stack usage. Reported by
4547 Max. (CVE-2015-8779)
4549 * The nan, nanf and nanl functions no longer have unbounded stack usage
4550 depending on the length of the string passed as an argument to the
4551 functions. Reported by Joseph Myers. (CVE-2014-9761)
4553 * A stack-based buffer overflow was found in libresolv when invoked from
4554 libnss_dns, allowing specially crafted DNS responses to seize control
4555 of execution flow in the DNS client. The buffer overflow occurs in
4556 the functions send_dg (send datagram) and send_vc (send TCP) for the
4557 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4558 family. The use of AF_UNSPEC triggers the low-level resolver code to
4559 send out two parallel queries for A and AAAA. A mismanagement of the
4560 buffers used for those queries could result in the response of a query
4561 writing beyond the alloca allocated buffer created by
4562 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4563 the overflow. Thanks to the Google Security Team and Red Hat for
4564 reporting the security impact of this issue, and Robert Holiday of
4565 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4567 The following bugs are resolved with this release:
4569 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4570 [887] math: Math library function "logb" and "nextafter" inconsistent
4571 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4572 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4573 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4574 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4576 [4404] localedata: German translation of "Alarm clock" is misleading
4577 [6799] math: nextafter() and nexttoward() doesn't set errno on
4578 overflow/underflow errors
4579 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4581 [10432] nis: _nss_nis_setnetgrent assertion failure
4582 [11460] libc: fts has no LFS support
4583 [12926] network: getaddrinfo()/make_request() may spin forever
4584 [13065] nptl: Race condition in pthread barriers
4585 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4586 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4588 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4589 [14912] libc: Rename non-installed bits/*.h headers
4590 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4591 [15367] math: Let gcc use __builtin_isinf
4592 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4593 [15421] math: lgamma wrongly sets signgam for ISO C
4594 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4595 FE_INVALID with argument out of range
4596 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4598 [15786] dynamic-link: ifunc resolver functions can smash function
4600 [15918] math: Unnecessary check for equality in hypotf()
4601 [16061] localedata: Review / update transliteration data
4602 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4604 [16141] time: strptime %z offset restriction
4605 [16171] math: drem should be alias of remainder
4606 [16296] math: fegetround is pure?
4607 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4608 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4610 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4611 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4613 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4614 "Exception "Inexact" set" on ppc32
4615 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4616 [16517] math: Missing underflow exception from tanf/tan/tanl
4617 [16519] math: Missing underflow exception from sinhf
4618 [16520] math: Missing underflow exception from tanhf
4619 [16521] math: Missing underflow exception from exp2
4620 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4622 [16734] stdio: fopen calls mmap to allocate its buffer
4623 [16961] math: nan function incorrect handling of bad sequences
4624 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4625 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4626 [16985] locale: localedef: confusing error message when opening output
4628 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4629 [17197] locale: Redundant shift character in iconv conversion output at
4631 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4632 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4633 [17250] dynamic-link: static linking breaks nss loading
4634 (getaddrinfo/getpwnam/etc...)
4635 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4637 [17441] math: isnan() should use __builtin_isnan() in GCC
4638 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4639 (related to lock elision)
4640 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4641 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4642 [17887] time: strptime should be able to parse "+01:00" style timezones
4643 [17905] libc: catopen() Multiple unbounded stack allocations
4645 [18084] libc: backtrace (..., 0) dumps core on x86
4646 [18086] libc: nice() sets errno to 0 on success
4647 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4648 is too large (CVE-2015-8778)
4649 [18251] dynamic-link: SONAME missing when audit modules provides path
4650 [18265] libc: add attributes for wchar string and memory functions
4651 [18370] math: csqrt missing underflows
4652 [18421] libc: [hppa] read-only segment has dynamic relocations
4653 [18472] libc: Obsolete syscall wrappers should be compat symbols
4654 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4655 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4656 [18525] localedata: Remove locale timezone information
4657 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4658 [18568] localedata: Update locale data to Unicode 8.0
4659 [18589] locale: sort-test.sh fails at random
4660 [18595] math: ctan, ctanh missing underflows
4661 [18604] libc: assert macro-expands its argument
4662 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4663 contains a vector instruction exception.
4664 [18611] math: j1, jn missing errno setting on underflow
4665 [18618] localedata: sync Chechen locale definitions with other *_RU
4667 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4668 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4669 [18665] network: In send_dg, the recvfrom function is NOT always using the
4670 buffer size of a newly created buffer (CVE-2015-7547)
4671 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4673 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4675 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4676 [18699] math: tilegx cproj() for various complex infinities does not yield
4678 [18724] libc: Harden put*ent functions against data injection
4679 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4680 [18755] build: build errors with -DNDEBUG
4681 [18757] stdio: fmemopen fails to set errno on failure
4682 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4684 [18781] libc: openat64 lacks O_LARGEFILE
4685 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4686 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4687 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4688 [18790] math: [ldbl-128ibm] tanhl inaccurate
4689 [18795] libc: stpncpy fortification misses buffer lengths that are
4690 statically too large
4691 [18796] build: build fails for --disable-mathvec
4692 [18803] math: hypot missing underflows
4693 [18820] stdio: fmemopen may leak memory on failure
4694 [18823] math: csqrt spurious underflows
4695 [18824] math: fma spurious underflows
4696 [18825] math: pow missing underflows
4697 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4698 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4699 [18870] build: sem_open.c fails to compile with missing symbol
4701 [18872] stdio: Fix memory leak in printf_positional
4702 [18873] libc: posix_fallocate overflow check ineffective
4703 [18875] math: Excess precision leads incorrect libm
4704 [18877] libc: arm: mmap offset regression
4705 [18887] libc: memory corruption when using getmntent on blank lines
4706 [18918] localedata: hu_HU: change time to HH:MM:SS format
4707 [18921] libc: Regression: extraneous stat() and fstat() performed by
4709 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4710 binaries (CVE-2015-8777)
4711 [18951] math: tgamma missing underflows
4712 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4714 [18953] localedata: lt_LT: change currency symbol to the euro
4715 [18956] math: powf inaccuracy
4716 [18961] math: [i386] exp missing underflows
4717 [18966] math: [i386] exp10 missing underflows
4718 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4719 [18969] build: multiple string test failures due to missing locale
4721 [18970] libc: Reference of pthread_setcancelstate in libc.a
4722 [18977] math: float / long double Bessel functions not in XSI POSIX
4723 [18980] math: i386 libm functions return with excess range and precision
4724 [18981] math: i386 scalb*, ldexp return with excess range and precision
4725 [18982] stdio: va_list and vprintf
4726 [18985] time: Passing out of range data to strftime() causes a segfault
4728 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4729 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4730 [19012] locale: iconv_open leaks memory on error path
4731 [19016] math: clog, clog10 inaccuracy
4732 [19018] nptl: Mangle function pointers in tls_dtor_list
4733 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4734 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4735 [19048] malloc: malloc: arena free list can become cyclic, increasing
4737 [19049] math: [powerpc] erfc incorrect zero sign
4738 [19050] math: [powerpc] log* incorrect zero sign
4739 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4740 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4741 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4742 [19074] network: Data race in _res_hconf_reorder_addrs
4743 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4744 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4745 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4747 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4749 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4750 [19086] manual: posix_fallocate64 documented argument order is wrong.
4751 [19088] math: lround, llround missing exceptions close to overflow
4753 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4754 [19095] math: dbl-64 lrint incorrect for 64-bit long
4755 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4756 [19124] dynamic-link: ld.so failed to build with older assembler
4757 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4758 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4759 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4760 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4761 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4762 pthread_setaffinity_np
4763 [19156] math: [ldbl-128] j0l spurious underflows
4764 [19164] nptl: tst-getcpu fails with many possible CPUs
4765 [19168] math: math/test-ildoubl and math/test-ldouble failure
4766 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4767 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4769 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4770 (FE_NOMASK_ENV) do not clear SSE exceptions
4771 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4772 _int_new_arena/reused_arena
4773 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4774 [19201] math: dbl-64 remainder incorrect sign of zero result
4775 [19205] math: bits/math-finite.h conditions do not match math.h and
4777 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4778 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4779 for C99-based standards
4780 [19212] libc: features.h not -Wundef clean
4781 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4783 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4784 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4785 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4787 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4788 "inexact" exceptions
4789 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4791 [19242] libc: strtol incorrect in Turkish locales
4792 [19243] malloc: reused_arena can pick an arena on the free list, leading
4793 to an assertion failure and reference count corruption
4794 [19253] time: tzset() ineffective when temporary TZ did not include DST
4796 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4797 [19270] math: [hppa] Shared libm missing __isnanl
4798 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4799 MAP_HUGETLB and MAP_STACK defines
4800 [19313] nptl: Wrong __cpu_mask for x32
4801 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4802 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4803 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4804 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4805 [19363] time: x32: times() return value wrongly truncates/sign extends
4807 [19367] dynamic-link: Improve branch prediction on Silvermont
4808 [19369] network: Default domain name not reset by res_ninit when "search"
4809 / "domain" entry is removed from resolv.conf
4810 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4812 [19385] localedata: bg_BG: time separator should be colon, not comma
4813 [19408] libc: linux personality syscall wrapper may erroneously return an
4814 error on 32-bit architectures
4815 [19415] libc: dladdr returns wrong names on hppa
4816 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4817 IBM905, IBM907, and IBM909
4818 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4819 [19443] build: build failures with -DDEBUG
4820 [19451] build: Make check fails on test-double-vlen2
4821 [19462] libc: Glibc failed to build with -Os
4822 [19465] math: Wrong code with -Os
4823 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4825 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4827 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4828 [19486] math: S390: Math tests fail with "Exception Inexact set".
4829 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4830 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4832 [19590] math: Fail to build shared objects that use libmvec.so functions.
4836 * The following bugs are resolved with this release:
4838 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4839 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4840 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4841 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4842 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4843 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4844 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4845 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4846 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4847 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4848 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4849 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4850 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4851 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4852 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4853 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4854 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4855 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4856 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4857 18657, 18676, 18694, 18696, 18887.
4859 * Cache information can be queried via sysconf() function on s390 e.g. with
4860 _SC_LEVEL1_ICACHE_SIZE as argument.
4862 * A buffer overflow in gethostbyname_r and related functions performing DNS
4863 requests has been fixed. If the NSS functions were called with a
4864 misaligned buffer, the buffer length change due to pointer alignment was
4865 not taken into account. This could result in application crashes or,
4866 potentially arbitrary code execution, using crafted, but syntactically
4867 valid DNS responses. (CVE-2015-1781)
4869 * The time zone file parser has been made more robust against crafted time
4870 zone files, avoiding heap buffer overflows related to the processing of
4871 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4872 large time zone data files. Overly long time zone specifiers in the TZ
4873 variable no longer result in stack overflows and crashes.
4875 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4876 for LD and GD on x86 and x86-64, has been implemented. You will need
4877 binutils-2.24 or later to enable this optimization.
4879 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4880 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4881 Hat). These updates cause user visible changes, such as the fix for bug
4884 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4885 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4886 condition in some applications.
4888 * Added vector math library named libmvec with the following vectorized x86_64
4889 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4891 The library can be disabled with --disable-mathvec. Use of the functions is
4892 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4893 Shared library libmvec.so is linked in as needed when using -lm (no need to
4894 specify -lmvec explicitly for not static builds).
4895 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4897 * A new fmemopen implementation has been added with the goal of POSIX
4898 compliance. The new implementation fixes the following long-standing
4899 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4900 old implementation is still present for use be by existing binaries.
4902 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4903 releases. It has been fixed to match 2.19 and older, but binaries built
4904 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4906 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4907 Contributed by Roland McGrath (Google).
4909 * The header <regexp.h> is deprecated, and will be removed in a future
4910 release. Use of this header will trigger a deprecation warning.
4911 Application developers should update their code to use <regex.h> instead.
4913 This header was formerly part of SUS, but was deprecated in 1994 and
4914 removed from the standard in 2001. Also, the glibc implementation
4915 leaks memory. See BZ#18681 for more details.
4919 * The following bugs are resolved with this release:
4921 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4922 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4923 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4924 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4925 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4926 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4927 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4928 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4929 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4930 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4933 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4934 too little memory for the to-be-scanned arguments and overflow the
4935 allocated buffer. The implementation now correctly computes the required
4936 buffer size when using malloc, and switches to malloc from alloca as
4939 * A new semaphore algorithm has been implemented in generic C code for all
4940 machines. Previous custom assembly implementations of semaphore were
4941 difficult to reason about or ensure that they were safe. The new version
4942 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4943 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4944 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4946 * Port to Altera Nios II has been contributed by Mentor Graphics.
4948 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4949 implementations for powerpc64/powerpc64le.
4950 Implemented by Adhemerval Zanella (IBM).
4952 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4953 and powerpc64le. This may improve lock scaling of existing programs on
4954 HTM capable systems. The lock elision code is only enabled with
4955 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4956 powerpc will issue a transaction abort on every syscall to avoid side
4957 effects being visible outside transactions.
4959 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4960 AArch64. Contributed by ARM Ltd.
4962 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4964 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4965 under certain input conditions resulting in the execution of a shell for
4966 command substitution when the application did not request it. The
4967 implementation now checks WRDE_NOCMD immediately before executing the
4968 shell and returns the error WRDE_CMDSUB as expected.
4970 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4971 processing format strings with a large number of format specifiers.
4973 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4974 infinite loop if the DNS response contained a PTR record of an unexpected
4977 * The minimum GCC version that can be used to build this version of the GNU
4978 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4979 still be used to compile programs using the GNU C Library.
4981 * The GNU C Library is now built with -Werror by default. This can be
4982 disabled by configuring with --disable-werror.
4984 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4986 * The obsolete sigvec function has been removed. This was the original
4987 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4988 programs have been using instead for about 25 years. Of course, ABI
4989 compatibility for old binaries using sigvec remains intact.
4991 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4992 with newer versions of bison.
4994 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4995 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4996 registers overlay two consecutive single-precision registers. MIPS32R2
4997 introduced a new FPU mode (FR=1) where double-precision registers extend the
4998 corresponding single-precision registers which is incompatible with the
4999 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
5000 require the use of FR=1 making a transition necessary. New o32 ABI
5001 extensions enable users to migrate over time from the original o32 ABI
5002 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
5003 tracks the ABI of any loaded object and verifies that new objects are
5004 compatible. Mode transitions will also be requested as required and
5005 unsupportable objects will be rejected. The ABI checks include both soft and
5006 hard float ABIs for o32, n32 and n64.
5008 GCC 5 with GNU binutils 2.25 onwards:
5009 It is strongly recommended that all o32 system libraries are built using the
5010 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
5011 with the original and all new o32 ABI extensions. Configure a MIPS GCC
5012 compiler using --with-fp-32=xx to set this by default.
5016 * The following bugs are resolved with this release:
5018 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
5019 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
5020 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
5021 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
5022 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
5023 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
5024 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
5025 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
5026 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
5027 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
5028 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
5029 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
5030 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
5031 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
5032 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
5034 * Reverted change of ABI data structures for s390 and s390x:
5035 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
5036 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
5037 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
5038 are preserved pointing straight to the same implementation as the old ones.
5039 Given that, new callers will simply provide a too-big buffer to these
5040 functions. Any applications/libraries out there that embed jmp_buf or
5041 ucontext_t in an ABI-relevant data structure that have already been rebuilt
5042 against 2.19 headers will have to rebuilt again. This is necessary in any
5043 case to revert the breakage in their ABI caused by the glibc change.
5045 * Support for file description locks is added to systems running the
5046 Linux kernel. The standard file locking interfaces are extended to
5047 operate on file descriptions, not file descriptors, via the use of
5048 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
5049 are associated with an open file instead of a process.
5051 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
5053 * The minimum Linux kernel version that this version of the GNU C Library
5054 can be used with is 2.6.32.
5056 * Running the testsuite no longer terminates as soon as a test fails.
5057 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
5058 with PASS or FAIL lines for individual tests. A summary of the results is
5059 printed, including a list of failing lists, and "make check" exits with
5060 error status if there were any unexpected failures. "make check
5061 stop-on-test-failure=y" may be used to keep the old behavior.
5063 * The am33 port, which had not worked for several years, has been removed
5066 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
5067 supported; they now act the same as _DEFAULT_SOURCE (but generate a
5068 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
5069 conflicted with POSIX (support for which was removed in 2.19), the
5070 interfaces those macros enabled remain available when compiling with
5071 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
5072 test macros defined.
5074 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
5076 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
5077 This may improve lock scaling of existing programs on TX capable systems.
5078 The lock elision code is only built with --enable-lock-elision=yes and
5079 then requires a GCC version supporting the TX builtins. With lock elision
5080 default mutexes are elided via __builtin_tbegin, if the cpu supports
5081 transactions. By default lock elision is not enabled and the elision code
5084 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
5085 copy the path argument. This allowed programs to cause posix_spawn to
5086 deference a dangling pointer, or use an unexpected pathname argument if
5087 the string was modified after the posix_spawn_file_actions_addopen
5090 * All supported architectures now use the main glibc sysdeps directory
5091 instead of some being in a separate "ports" directory (which was
5092 distributed separately before glibc 2.17).
5094 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
5095 On configurations that support it (all Linux configurations), it's now
5096 used regardless of the --enable-add-ons switch to configure. It is no
5097 longer possible to build such configurations without pthreads support.
5099 * Locale names, including those obtained from environment variables (LANG
5100 and the LC_* variables), are more tightly checked for proper syntax.
5101 setlocale will now fail (with EINVAL) for locale names that are overly
5102 long, contain slashes without starting with a slash, or contain ".." path
5103 components. (CVE-2014-0475) Previously, some valid locale names were
5104 silently replaced with the "C" locale when running in AT_SECURE mode
5105 (e.g., in a SUID program). This is no longer necessary because of the
5108 * On x86-64, the dynamic linker's lazy-binding support is now compatible
5109 with application code using Intel MPX instructions. (With all previous
5110 versions, the MPX register state could be clobbered when making calls
5111 into or out of a shared library.) Note that while the new dynamic
5112 linker is compatible with all known x86 hardware whether or not it
5113 supports Intel MPX, some x86 instruction-set emulators might fail to
5114 handle the new instruction encodings. This is known to affect Valgrind
5115 versions up through 3.9 (but will be fixed in the forthcoming 3.10
5116 release), and might affect other tools that do instruction emulation.
5118 * Support for loadable gconv transliteration modules has been removed.
5119 The support for transliteration modules has been non-functional for
5120 over a decade, and the removal is prompted by security defects. The
5121 normal gconv conversion modules are still supported. Transliteration
5122 with //TRANSLIT is still possible, and the //IGNORE specifier
5123 continues to be supported. (CVE-2014-5119)
5125 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
5126 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
5127 resulting a denial-of-service security vulnerability in applications which
5128 use functions related to iconv. (CVE-2014-6040)
5132 * The following bugs are resolved with this release:
5134 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5135 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5136 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5137 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5138 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5139 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5140 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5141 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5142 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5143 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5144 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5145 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5146 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5147 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5148 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5149 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5150 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5151 16431, 16453, 16474, 16506, 16510, 16529
5153 * Slovenian translations for glibc messages have been contributed by the
5154 Translation Project's Slovenian team of translators.
5156 * The public headers no longer use __unused nor __block. This change is to
5157 support compiling programs that are derived from BSD sources and use
5158 __unused internally, and to support compiling with Clang's -fblock
5159 extension which uses __block.
5161 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5162 large collation sequences to optimize multiple passes. This cache
5163 computation may overflow for large collation sequences and may cause a
5164 stack or buffer overflow. This is now fixed to use a slower algorithm
5165 which does not use a cache if there is an integer overflow.
5167 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5168 rules for large collation sequences to optimize multiple passes and falls
5169 back to alloca if malloc fails, resulting in a possible stack overflow.
5170 The implementation now falls back to an uncached collation sequence lookup
5173 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5174 initialized for static applications resulting in the security feature
5175 being disabled. The pointer guard is now correctly initialized to a
5176 random value for static applications. Existing static applications need
5177 to be recompiled to take advantage of the fix (bug 15754).
5179 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5180 to the d_name member of struct dirent, or omit the terminating NUL
5181 character. (Bugzilla #14699).
5183 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5184 aligned_alloc functions could allocate too few bytes or corrupt the
5185 heap when passed very large allocation size values (Bugzilla #15855,
5188 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5189 for AF_INET6 has been fixed (Bugzilla #16072).
5191 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5192 pap_CW, quz_PE, the_NP.
5194 * Substantially revised locales: gd_GB, ht_HT
5196 * The LC_ADDRESS field was updated to support country_car for almost all
5199 * ISO 1427 definitions were updated.
5201 * ISO 3166 definitions were updated.
5203 * The localedef utility now supports --big-endian and --little-endian
5204 command-line options to generate locales for a different system from that
5205 for which the C library was built.
5207 * Binary locale files now only depend on the endianness of the system for
5208 which they are generated and not on other properties of that system. As a
5209 consequence, binary files generated with new localedef may be incompatible
5210 with old versions of the GNU C Library, and binary files generated with
5211 old localedef may be incompatible with this version of the GNU C Library,
5212 in the following circumstances:
5214 + Locale files may be incompatible on m68k systems.
5216 + Locale archive files (but not separate files for individual locales) may
5217 be incompatible on systems where plain "char" is signed.
5219 * The configure option --disable-versioning has been removed. Builds with
5220 --disable-versioning had not worked for several years.
5222 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5223 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5225 * SystemTap probes for malloc have been introduced.
5227 * SystemTap probes for slow multiple precision fallback paths of
5228 transcendental functions have been introduced.
5230 * Support for powerpc64le has been added.
5232 * The soft-float powerpc port now supports e500 processors.
5234 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5236 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5237 set of header declarations that are enabled by default, even when other
5238 feature test macros or compiler options such as -std=c99 would otherwise
5239 disable some of those declarations.
5241 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5242 conflict with POSIX. The libbsd-compat library (which was a dummy library
5243 that did nothing) has also been removed.
5245 * Preliminary documentation about Multi-Thread, Async-Signal and
5246 Async-Cancel Safety has been added.
5248 * Change of ABI data structures for s390 and s390x:
5249 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5250 allow for future hardware extensions. All library functions that accept or
5251 return these structures were versioned in order to provide backwards
5252 compatibility with existing code. However, not all cases can be handled
5253 with interface versioning. If an application embeds either structure into
5254 another structure and that structure is passed to another compilation unit
5255 which expects the newer larger-sized object then any access to the new
5256 fields will result in undefined behaviour. Similarly any access to fields
5257 that were moved by the enlarging of the structures will cause undefined
5258 behaviour. To fix the undefined behaviour all objects that are part of the
5259 final in-memory image must agree on the size of structures, and this may
5260 require recompilation.
5264 * The following bugs are resolved with this release:
5266 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5267 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5268 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5269 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5270 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5271 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5272 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5273 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5274 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5275 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5276 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5277 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5278 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5281 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5282 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5283 Distributions can re-enable building and using pt_chown via the new configure
5284 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5285 considerable security risks and should only be used if the distribution
5286 understands and accepts the risks.
5288 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5291 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5292 fixed (Bugzilla #15330).
5294 * Add support for calling C++11 thread_local object destructors on thread
5295 and program exit. This needs compiler support for offloading C++11
5296 destructor calls to glibc.
5298 * Improved worst case performance of libm functions with double inputs and
5301 * Support for priority inherited mutexes in pthread condition variables on
5302 non-x86 architectures.
5304 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5306 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5308 * Optimized string functions for ARM. Implemented by Will Newton and
5311 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5313 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5316 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5317 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5319 * Added a benchmark framework to track performance of functions in glibc.
5321 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5322 It is based on draft TS 18661 and currently enabled as a GNU extension.
5324 * On Linux, the clock function now uses the clock_gettime system call
5325 for improved precision, rather than old times system call.
5327 * Added support for version-3 tz format files. This is needed when using
5328 the tz database release 2013e or later, and affects a few unusual cases --
5329 currently only TZ='America/Godthab' for time stamps after 2037.
5331 * Added new API functions pthread_getattr_default_np and
5332 pthread_setattr_default_np to get and set the default pthread
5333 attributes of a process.
5335 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5336 This may improve lock scaling of existing programs on TSX capable systems.
5337 When the --enable-lock-elision=yes parameter is specified at configure
5338 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5341 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5342 availability). Implemented by Ryan S. Arnold.
5344 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5348 * The following bugs are resolved with this release:
5350 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5351 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5352 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5353 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5354 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5355 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5356 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5357 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5358 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5359 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5360 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5361 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5362 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5363 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5364 14879, 14889, 14893, 14898, 14914.
5366 * Optimization of memcpy for MIPS.
5368 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5369 EMFILE has been fixed (Bugzilla #14889).
5371 * The add-on ports collection is now distributed in the "ports" subdirectory
5372 of the main GNU C Library distribution, rather than separately.
5374 * Port to ARM AArch64 contributed by Linaro.
5376 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5377 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5379 Implemented by Andreas Krebbel.
5381 * The new function secure_getenv allows secure access to the environment,
5382 returning NULL if running in a SUID/SGID process. This function replaces
5383 the internal function __secure_getenv.
5385 * SystemTap static probes have been added into the dynamic linker.
5386 Implemented by Gary Benson.
5388 * Optimizations of string functions strstr, strcasestr and memmem.
5389 Implemented by Maxim Kuvyrkov.
5391 * The minimum Linux kernel version that this version of the GNU C Library
5392 can be used with is 2.6.16.
5394 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5395 powerpc POWER7. Implemented by Will Schmidt.
5397 * New configure option --disable-nscd builds the C library such that it
5398 never attempts to contact the Name Service Caching Daemon (nscd).
5399 New configure option --disable-build-nscd avoids building nscd itself;
5400 this is the default if --disable-nscd is used.
5402 * Improved support for cross-compilation, including cross-testing and
5403 bootstrap builds without a previously built glibc.
5405 * Several testsuite tests are now able to test multiple IFUNC variants of an
5406 interface, rather than just testing the one that would be chooen by
5409 * New configure options --with-bugurl and --with-pkgversion, for
5410 distributors to use to embed their bug-reporting and package version
5411 information in --help and --version output.
5413 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5414 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5415 allows creation of chroots without the procfs mounted on /proc.
5417 * The `crypt' function now fails if passed salt bytes that violate the
5418 specification for those values. On Linux, the `crypt' function will
5419 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5420 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5421 when the mode is enabled.
5423 * The `clock_*' suite of functions (declared in <time.h>) is now available
5424 directly in the main C library. Previously it was necessary to link with
5425 -lrt to use these functions. This change has the effect that a
5426 single-threaded program that uses a function such as `clock_gettime' (and
5427 is not linked with -lrt) will no longer implicitly load the pthreads
5428 library at runtime and so will not suffer the overheads associated with
5429 multi-thread support in other code such as the C++ runtime library.
5431 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5436 * The following bugs are resolved with this release:
5438 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5439 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5440 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5441 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5442 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5443 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5444 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5445 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5446 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5447 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5448 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5449 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5450 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5451 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5452 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5453 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5454 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5455 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5456 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5457 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5458 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5459 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5462 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5463 configuring glibc with:
5464 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5465 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5466 Implemented by H.J. Lu.
5470 + define static_assert
5472 + do not declare gets
5474 + declare at_quick_exit and quick_exit also for ISO C11
5476 + aligned_alloc. NB: The code is deliberately allows the size parameter
5477 to not be a multiple of the alignment. This is a moronic requirement
5478 in the standard but it is only a requirement on the caller, not the
5481 + timespec_get added
5483 + uchar.h support added
5485 + CMPLX, CMPLXF, CMPLXL added
5487 Implemented by Ulrich Drepper.
5489 * Support for the IA-64 has been moved to ports.
5491 * Remove support for anything but ELF binary format
5493 * Checking versions of poll, ppoll added.
5494 Implemented by Ulrich Drepper.
5496 * More generic and 64-bit performance optimizations to math functions.
5497 Implemented by Ulrich Drepper.
5499 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5500 headers and functions available at compile time as they were before
5501 version 2.14. This option will be removed at some time in the future
5502 after the TI-RPC library becomes fully sufficient for the needs of
5503 existing applications.
5505 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5506 Note that glibc is not expected to work with any Linux kernel version
5509 * New header <sys/auxv.h> and function getauxval allowing easy access to
5510 the AT_* key-value pairs passed from the Linux kernel. The header also
5511 defines the HWCAP_* bits associated with the AT_HWCAP key.
5513 * New locales: mag_IN
5515 * New configure option --enable-systemtap builds SystemTap static probes
5516 into libc for setjmp and longjmp and into libpthread for various operations.
5517 So far the setjmp/longjmp probes and some of the libpthread probes are
5518 provided only for i*86 and x86_64.
5519 Implemented by Roland McGrath and Rayson Ho.
5521 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5523 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5526 * More optimized functions for SPARC. Implemented by David S. Miller.
5528 * Improved support for cross-compilation, especially bootstrap builds
5529 without a previously built glibc.
5531 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5532 Chris Metcalf from Tilera.
5534 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5535 now supported for ARM processors.
5537 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5538 as the name of the dynamic linker, to distinguish it from the
5539 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5541 * Support for CRIS has been removed from ports.
5543 * A new class of installed header has been documented for low-level
5544 platform-specific functionality. PowerPC added the first instance with a
5545 function to provide time base register access. Contributed by Tulio
5546 Magno Quites Machado Filho.
5548 * ix86 configurations now install header files that are consistent with
5549 what x86-64 configurations install. These same header files can be used
5550 for -m32, -m64, or -mx32 builds.
5551 Contributed by H.J. Lu.
5553 * Math library bug fixes. A thorough audit of all open math library bugs was
5554 conducted by Joseph Myers. Significant progress was made on many math
5555 library bugs resulting in more accurate exceptions and function results.
5556 Many thanks to all those that contributed including Andreas Jaeger for his
5557 patch review and work on the x87 trigonometric instruction issues.
5559 * Timezone data is no longer installed. Timezone-related binaries and scripts
5560 will continue to be installed. Users should obtain their timezone data from
5561 their distribution provider or from the tzdata package at
5562 <ftp://munnari.oz.au/pub/>.
5566 * The following bugs are resolved with this release:
5568 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5569 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5570 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5571 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5572 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5573 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5574 13484, 13506, 13515, 13523, 13524, 13538, 13540
5576 * New program pldd to list loaded object of a process
5577 Implemented by Ulrich Drepper.
5579 * Add nss_db support back to glibc. No more dependency on Berkeley db
5580 and support for initgroups lookups.
5581 Implemented by Ulrich Drepper.
5583 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5584 Contributed by HJ Lu.
5586 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5587 Contributed by HJ Lu.
5589 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5590 on x86-32 and x86-64.
5591 Contributed by Liubov Dmitrieva.
5593 * Optimized strchr and strrchr for SSE on x86-32.
5594 Contributed by Liubov Dmitrieva.
5596 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5597 for x86-64 and x86-32.
5598 Contributed by Liubov Dmitrieva.
5600 * New interfaces: scandirat, scandirat64
5601 Implemented by Ulrich Drepper.
5603 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5604 Implemented by Ulrich Drepper.
5606 * nscd now also caches the netgroup database.
5607 Implemented by Ulrich Drepper.
5609 * Integrate libm with gcc's -ffinite-math-only option.
5610 Implemented by Ulrich Drepper.
5612 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5613 to math functions. Implemented by Ulrich Drepper.
5615 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5616 Implemented by Ulrich Drepper.
5618 * New Linux interfaces: process_vm_readv, process_vm_writev
5620 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5621 Implemented by Ulrich Drepper.
5623 * Optimized nearbyint and strcasecmp for PPC.
5624 Implemented by Adhemerval Zanella.
5626 * New locales: bho_IN, unm_US, es_CU, ta_LK
5630 * The following bugs are resolved with this release:
5632 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5633 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5634 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5635 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5636 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5637 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5638 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5639 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5640 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5641 12795, 12811, 12813, 12814, 12841
5643 * The RPC implementation in libc is obsoleted. Old programs keep working
5644 but new programs cannot be linked with the routines in libc anymore.
5645 Programs in need of RPC functionality must be linked against TI-RPC.
5646 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5648 Visible changes of this change include (obviously) the inability to link
5649 programs using RPC functions without referencing the TI-RPC library and the
5650 removal of the RPC headers from the glibc headers.
5651 Implemented by Ulrich Drepper.
5653 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5654 syncfs, setns, sendmmsg
5656 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5657 yue_HK, lij_IT, mhr_RU
5659 * New encodings: CP770, CP771, CP772, CP773, CP774
5661 * New program sotruss to trace calls through PLTs
5662 Implemented by Ulrich Drepper.
5664 * The malloc hook implementation is marked deprecated and will be removed
5665 from the default implementation in the next version. The design never
5666 worked ever since the introduction of threads. Even programs which do
5667 not create threads themselves can use multiple threads created internally.
5671 * The following bugs are resolved with this release:
5673 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5674 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5675 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5676 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5679 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5681 * POWER7 optimizations: memset, memcmp, strncmp
5683 * New optimized string functions for x86-64: strnlen (SSE2),
5684 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5685 Implemented by Ulrich Drepper.
5689 * The following bugs are resolved with this release:
5691 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5692 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5693 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5694 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5695 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5696 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5697 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5698 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5700 * New interfaces: pthread_getname_np, pthread_setname_np
5702 * New Linux interface: recvmmsg
5704 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5706 * The dynamic linker now recognizes supported ABI versions from the
5707 EI_ABIVERSION field in the ELF header.
5708 Implemented by Ulrich Drepper.
5710 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5711 will not be used to fill in password fields in the passwd.byname replies.
5712 Instead it is used to synthesize the shadow.byname table, should it be
5713 missing. This is a useful mode in some installations involving Solaris.
5714 Implemented by Ulrich Drepper.
5716 * New locales: kok_IN, sq_MK, cv_RU
5720 * The following bugs are resolved with this release:
5722 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5723 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5724 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5725 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5726 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5727 10789, 10817, 10823, 10840, 10847
5729 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5731 Implemented by Ulrich Drepper.
5733 * Checking version of longjmp added that fails if an uninitialized stack
5734 frame would be created. Implemented by Ulrich Drepper.
5736 * STT_GNU_IFUNC is now supported in static executables.
5737 Implemented by H.J. Lu.
5739 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5741 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5742 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5743 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5744 Contributed by H.J. Lu.
5746 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5747 Implemented by Ulrich Drepper.
5749 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5751 Contributed by H.J. Lu.
5753 * Support for fma instruction in AVX on x86-64.
5754 Implemented by H.J. Lu and Ulrich Drepper.
5756 * AVX support in x86-64 auditing support in ld.so.
5757 Implemented by H.J. Lu.
5759 * STB_GNU_UNIQUE support added.
5760 Implemented by Ulrich Drepper.
5762 * Implement second fallback mode for optimized DNS lookup for even more
5763 broken environments. If two requests from the same port are not
5764 handled correctly close the socket and open a new one before sending
5765 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5766 can be used to select this mode right away, instead of rediscovering the
5767 necessity is every process again.
5768 Implemented by Ulrich Drepper.
5770 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5771 Implemented by Adam Tkac.
5773 * Optimized iconv conversions for S390x.
5774 Implemented by Andreas Krebbel.
5776 * Using condvars with PI mutexes is now more efficient due to kernel
5777 support for requeueing to PI futexes. NPTL support added for x86-64.
5778 Implemented by Ulrich Drepper.
5780 * New locales: ps_AF, my_MM
5784 * The following bugs are resolved with this release:
5786 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5787 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5788 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5789 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5790 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5792 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5793 Implemented by Ulrich Drepper.
5795 * New Linux interfaces: accept4, fallocate, fallocate64.
5796 Implemented by Ulrich Drepper.
5798 * Correct declarations of string function when used in C++ code. This
5799 could lead to compile errors for invalid C++ code.
5801 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5804 * New POSIX 2008 interface: psiginfo
5805 Implemented by Ulrich Drepper.
5807 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5808 Implemented by Ulrich Drepper.
5810 * Support for selecting between multiple function definitions at runtime
5811 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5813 * The libcrypt library can now use the hash function implementations in
5814 NSS. Implemented by Ulrich Drepper.
5816 * The malloc implementation can be compiled to be less memory efficient
5817 but higher performing in multi-threaded programs.
5818 Implemented by Ulrich Drepper.
5820 * New locales: nan_TW@latin, ks_IN
5822 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5823 Implemented by Ulrich Drepper.
5825 * Extended printf hook support. It is possible to use user-defined types
5826 and extend existing format specifiers.
5827 Implemented by Ulrich Drepper.
5829 * Handling for group shadow files has been added.
5830 Implemented by Ulrich Drepper.
5832 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5833 servers (the case, e.g., for some people using the built-in DNS
5834 server in ADSL modems/routers). There is a once-per-process timeout
5835 in case of a broken server. To avoid it, users can run nscd or put
5836 'options single-request' in /etc/resolv.conf.
5837 Implemented by Ulrich Drepper.
5841 * The following bugs are resolved with this release:
5843 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5844 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5845 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5846 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5847 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5849 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5850 up at the same time. Implemented by Ulrich Drepper.
5852 * TLS descriptors for LD and GD on x86 and x86-64.
5853 Implemented by Alexandre Oliva.
5855 * getaddrinfo now handles DCCP and UDPlite.
5856 Implemented by Ulrich Drepper.
5858 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5859 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5860 Implemented by Ulrich Drepper.
5862 * New implementation of memmem, strstr, and strcasestr which is O(n).
5863 Implemented by Eric Blake.
5865 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5867 * Implement "e" option for popen to open file descriptor with the
5868 close-on-exec flag set. Implemented by Ulrich Drepper.
5870 * Implement "b" mode for fmemopen. In this mode writes writes don't
5871 implicitly add a NUL byte and seeks from the end of the buffer really
5872 use the buffer end, not the string length as the basis.
5873 Implemented by Ulrich Drepper.
5875 * Many functions, exported and internal, now atomically set the close-on-exec
5876 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5878 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5880 Implemented by Pravin Satpute.
5882 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5886 * The following bugs are resolved with this release:
5888 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5889 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5890 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5891 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5892 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5893 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5894 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5896 * New locales: bo_CN, bo_IN, shs_CA.
5898 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5900 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5901 Implemented by Pravin Satpute.
5903 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5905 * nscd caches now all timeouts for DNS entries
5906 Implemented by Ulrich Drepper.
5908 * nscd is more efficient and wakes up less often.
5909 Implemented by Ulrich Drepper.
5911 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5912 vdprintf, and obstack_vprintf.
5913 Implemented by Jakub Jelinek.
5915 * Faster memset for x86-64.
5916 Implemented by Harsha Jagasia and H.J. Lu.
5918 * Faster memcpy on x86.
5919 Implemented by Ulrich Drepper.
5921 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5922 Implemented by Ulrich Drepper.
5924 * Faster sqrt and sqrtf implementation for some PPC variants.
5925 Implemented by Steven Munroe.
5929 * The following bugs are resolved with this release:
5931 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5932 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5933 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5934 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5935 5071, 5103, 5104, 5112, 5113, 5184, 5186
5937 * More checking functions: fread, fread_unlocked, open*, mq_open.
5938 Implemented by Jakub Jelinek and Ulrich Drepper.
5940 * Extend fortification to C++. Implemented by Jakub Jelinek.
5942 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5943 by not recognizing 'a' as a modifier when those specs are requested.
5944 Implemented by Jakub Jelinek.
5946 * PPC optimizations to math and string functions.
5947 Implemented by Steven Munroe.
5949 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5950 options to be passed. Implemented by Ulrich Drepper.
5952 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5954 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5955 Implemented by Ulrich Drepper.
5957 * Handle private futexes in the NPTL implementation.
5958 Implemented by Jakub Jelinek and Ulrich Drepper.
5960 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5961 Implemented by Roland McGrath and Ulrich Drepper.
5963 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5965 * SHA-256 and SHA-512 based password encryption.
5966 Implemented by Ulrich Drepper.
5968 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5969 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5972 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5973 Implemented by Ulrich Drepper.
5977 * The following bugs are resolved with this release:
5979 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5980 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5981 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5982 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5983 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5984 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5985 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5988 * New Linux interfaces: epoll_pwait, sched_getcpu.
5990 * New generic interfaces: strerror_l.
5992 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5996 * The following bugs are resolved with this release:
5998 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5999 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
6000 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
6001 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
6002 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
6003 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
6004 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
6005 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
6006 3225, 3251, 3252, 3253, 3273
6008 * For Linux, the sorting of addresses returned by getaddrinfo now also
6009 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
6010 Implemented by Ulrich Drepper.
6012 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
6013 Implemented by Ulrich Drepper.
6015 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
6017 * New iconv module for MIK. Contributed by Alexander Shopov.
6019 * For sites with broken group and/or passwd database, the auto-propagate
6020 option of nscd can prevent creating ID lookup entries from the results
6021 of a name lookup and vice versa. This usually is no problem but some
6022 site might have problems with the default behavior.
6023 Implemented by Ulrich Drepper.
6025 * Iterating over entire database in NIS can be slow. With the
6026 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
6027 to trade time for memory. The entire database will be read at once.
6028 Implemented by Ulrich Drepper.
6030 * The interfaces introduced in RFC 3542 have been implemented by
6033 * Support for the new ELF hash table format was added by Ulrich Drepper.
6035 * Support for priority inheritance mutexes added by Jakub Jelinek and
6038 * Support for priority protected mutexes added by Jakub Jelinek.
6040 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
6041 or_IN, csb_PL, fy_NL, sr_ME.
6045 * More overflow detection functions.
6047 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
6048 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
6050 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
6051 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
6052 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
6053 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
6054 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
6055 by Masahide Washizawa.
6057 * It is now possible to install audit libraries for the dynamic linker using
6058 LD_AUDIT. Implemented by Ulrich Drepper.
6060 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
6061 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
6062 For a libc and libpthread that works well on Linux 2.4 kernels, we
6063 recommend using the stable 2.3 branch.
6065 * The new function open_wmemstream acts like open_memstream,
6066 but uses a wchar_t wide character buffer.
6068 * The new function ppoll is an improved version of poll, similar to pselect.
6070 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
6071 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
6072 renameat, unlinkat, linkat, symlinkat, readlinkat.
6074 * New Linux kernel system calls: unshare,
6075 inotify_init, inotify_add_watch, inotify_rm_watch.
6077 * The euidaccess function is now also known by the alias eaccess,
6078 for compatibility with some other systems.
6080 * Timezone data updated to 2006b version.
6084 * The following bugs are resolved with this release:
6086 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
6087 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
6088 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
6089 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
6090 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
6091 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
6093 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6095 * As of this release, GCC 4 can be used to compile the C Library.
6097 * Timezone data updated to 2005m version.
6101 * The following bugs are resolved with this release:
6103 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
6104 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
6105 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
6106 777, 787, 821, 822, 823, 825
6108 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
6112 * Support for RFC 3678. Real implementations exist only for Linux so far.
6113 Implemented by Ulrich Drepper.
6115 * nscd can now cache entries persistently. Expiring entries are reloaded.
6116 For speedups the cache can be shared in memory with client processes.
6117 Implemented by Ulrich Drepper.
6119 * nscd can now perform SELinux checks.
6120 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
6122 * getaddrinfo queries are now cached. Canonical name lookup is performed
6124 Implemented by Ulrich Drepper.
6126 * The nothrow function attribute is used when headers are used by gcc when
6127 compiling C code. This can avoid significant amounts of exception
6130 * The malloc functions perform more error checking and are stricter when
6131 it comes to reacting on errors. The default action is to terminate
6132 the process after showing an error message. Implemented by Ulrich Drepper.
6134 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6135 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6137 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6138 namespaces using the new function dlmopen(). This feature is of course,
6139 like most other dynamic loading functionality, not available in statically
6140 linked applications. Implemented by Ulrich Drepper.
6142 * Low-overhead boundary checking variants of string and some stdio functions
6143 were added. These are to be used in conjunction with a gcc patch by
6144 Jakub Jelinek which adds calls to these functions if possible.
6145 Implemented by Jakub Jelinek and Ulrich Drepper.
6147 * Old code for several operating systems and machine architectures that
6148 have not been in working condition in a long time have been removed from
6149 the main source tree maintained by the GNU C Library's maintainers.
6150 These files are now reside in the separate `ports' source module
6151 that is usable as an add-on when building the library.
6155 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6156 interrogate the dynamic linker, compatible with the Solaris interface.
6158 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6159 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6161 * getifaddrs now uses the netlink interface on Linux to get its information.
6162 Implemented by Thorsten Kukuk.
6164 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6165 Implemented by Ulrich Drepper.
6167 * support for non-executable stacks on x86 has been added. Changes mostly
6170 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6173 * getaddrinfo now performs destination address selection according to
6178 * Thread-safe interfaces for many functions that access locale data
6179 were added in version 2.3, but these features were omitted from NEWS.
6180 Many functions have variants with an `_l' suffix that take a `locale_t'
6181 object as a parameter rather than consulting the current locale.
6182 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6183 create and maintain `locale_t' objects. Additionally, the new function
6184 `uselocale' sets "the current locale" (as used by functions not so
6185 parameterized) set for an individual thread. These features were added
6186 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6188 * The functions getresuid, getresgid, setresuid, and setresgid, which
6189 have long been available on Linux, are now declared in <unistd.h>
6190 and are now also available on the Hurd.
6192 * ELF thread-local storage support (TLS) now works on x86-64.
6194 * The new dynamic string token $LIB is expanded in shared library names.
6195 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6197 * Aldy Hernandez contributed complete software floating point support for
6198 PowerPC machines with no FPU.
6200 * fexecve is implemented on Linux.
6202 * The `btowc' function should work at least twice as fast due to
6203 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6205 * With appropriate thread add-ons cancelable functions are now implemented
6206 in libc.so as well. No need to call the function in libpthread. This
6207 change allowed to finally disable the incorrect and expensive handling
6208 of weak definition in ld.so.
6210 * Yet more PLT entries in libc.so have been removed. We finally arrived
6211 at the bare minimum. Startup times improved appropriately.
6213 * Support for the new Linux/x86 system call interface was added. The
6214 AT_SYSINFO auxiliary vector entry is recognized and handled.
6218 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6221 * iconv (the program and the interface) now accepts empty names (excluding
6222 options like //TRANSLIT) to mean "use charset of current locale".
6224 * localedef can now transliterate characters in strings which are not in
6225 the provided charmap. The information from the input locale is used.
6227 * Prelinking support was added for ELF targets. This requires additional
6228 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6230 * Read-only stdio streams now use mmap to speed up operation by eliminating
6231 copying and buffer underflows. To use add 'm' to the mode string of
6232 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6234 * The malloc functions were completely rewritten by Wolfram Gloger based
6235 on Doug Lea's malloc-2.7.0.c.
6237 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6238 implementation of regex.
6240 * Bruno Haible upgraded the iconv and locale implementation to support
6243 * Contents of the LC_* and LANG environment variables in the CEN style are
6244 not recognized anymore. It never was used. Change by Ulrich Drepper.
6246 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6247 thread-local storage (TLS) ABI on some platforms.
6248 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6250 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6251 EUC-JISX0213, and TSCII.
6253 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6254 BSD-compatible interface for getting all network interface addresses.
6255 Implementation for IPv4 by Roland McGrath.
6257 * Loading of locale data is faster due to the introduction of a locale
6258 archive. Implemented by Roland McGrath and Ulrich Drepper.
6260 * Startup times are significantly reduced by not using exported functions
6261 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6264 * Steven Munroe contributed a port to PowerPC64/Linux.
6268 * The Hurd now uses the GNU libio implementation of stdio rather than the
6269 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6271 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6272 with the same behavior as the Linux system call of the same name.
6276 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6277 128-bit long double format.
6279 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6280 IBM1161, and IBM1162 charsets.
6282 * Andreas Jaeger contributed a port to x86-64/Linux.
6284 * Peter Bruin contributed a port to PowerPC/Hurd.
6286 * libc functions using I/O streams now can handle wide-oriented streams
6289 * optimizations in the dynamic linker. Binaries created by recent binutils
6290 versions start up quicker due to reduced time spent on relocations.
6292 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6296 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6297 asinh, atanh, j0 for the 128-bit long double format.
6299 * Bruno Haible updated all the code handling Unicode in some form to
6300 support Unicode 3.1.
6302 * Speed of regex for single-byte locales is back to previous levels.
6303 Patch by Isamu Hasegawa.
6305 * Alpha, SPARC, and IA-64 now also using floating stacks.
6307 * Startup time of internationalized applications greatly improved through
6308 iconv cache. Use iconvconfig to generate the cache file.
6309 Contributed by Ulrich Drepper.
6311 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6312 severe performance problems. Patch by David Mosberger.
6314 * The Hurd port got a lot more functionality like AIO, various stdio
6315 extensions, etc. Mainly done by Roland McGrath.
6317 * mtrace can now lookup symbols in shared libraries.
6321 * Intel's IA-64 math library is largely integrated. It provides fast and
6322 accurate implementatations for most basic and standard math functions
6323 in float, double, and long double format.
6325 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6326 and asin for the 96-bit long double format and asin, log, tan for the
6327 128-bit long double format.
6329 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6330 The basic double functions exist today. Contributed by Abraham Ziv
6331 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6332 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6334 * An asynchronous name lookup library was added. The interface is designed
6335 after POSIX AIO. The proposal was circulated beforehand to get comments.
6336 No negative ones came in. Implemented by Ulrich Drepper.
6338 * Port to S390/64bit contributed by Martin Schwidefsky
6339 <schwidefsky@de.ibm.com>.
6341 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6342 of functions for Linux/IA-64.
6344 * The RPC code is now thread safe. Threads can now use the same service
6345 of different services at the same time. Patch by Eric Norum
6346 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6348 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6349 family of functions for Linux/S390.
6351 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6352 of functions for Linux/x86.
6354 * Port to Linux/CRIS contributed by Axis Communications.
6358 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6359 we can now check for namespace violations and missing declarations. The
6360 result is that almost all headers are now Unix-compliant (as defined in
6361 the upcoming XPG6). The negative side is that some programs might need
6362 corrections, too, if they depend on the incorrect form of the headers in
6363 previous versions which defined too many symbols and included too many
6366 * regex now handles multibyte character sets correctly.
6367 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6369 * iconv (the program) does now conform to the upcoming XPG6 and handles
6370 charmaps. Instead of the charset names the path of charmaps can be
6371 provided and the conversion happens based on this data.
6372 Contributed by Ulrich Drepper.
6374 * The locale program now provides detailed information about the installed
6379 only lists the names of the supported locales
6383 provides details such as country, language, and codeset name.
6384 Contributed by Ulrich Drepper.
6388 * The gencat program now parses the input file according to the charset
6389 selected by the LC_CTYPE category. This is important for stateful
6390 character sets. To make generating catalogs easier there is a way
6391 to overwrite the charset selected by the locale: before the first
6392 message or $ quote line the catalog can contain a line like
6394 $ codeset=ISO-8859-2
6396 to select the charset (ISO-8859-2 in this case).
6398 Implemented by Shinya Hanataka and Ulrich Drepper.
6400 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6401 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6402 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6404 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6405 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6407 * The LANGUAGE environment variable is now ignored unless the locale is
6408 changed from the default "C" locale.
6410 * The usual bug fixes.
6414 * Greg McGary added runtime support for bounds checking using gcc's
6415 new -fbounded-pointers option. ix86 target is complete. PowerPC
6418 * Thorsten Kukuk added secure mode support to nscd.
6420 * The Berkeley db libraries have been removed.
6422 Related, the nss_db module is now in a separate package since it
6423 obviously requires a database library being available.
6425 * Wide character I/O streams implemented by Ulrich Drepper.
6427 * Functions from the extended socket API added by Ulrich Drepper.
6429 * Functions feenableexcept and fedisableexcept to control the
6430 behaviour of individual exceptions have been added by Andreas Jaeger.
6432 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6434 * The resolver code has been updated from bind 8.2.3-T5B which supports
6435 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6438 This change could in some situations effect backward compatibility. Since
6439 now `_res' is a thread-local instead of a global variable, modifying it
6440 in one thread does not have any effect in other threads.
6442 The resolver library was also extended to allow IPv6 as the transport
6443 protocol for the requests. This work was done by Stig Venaas.
6445 * Compatibility code for K&R C compilers has been removed from the
6446 header files. A ISO C compiler is needed to use the library
6447 (conforming to either C89 or C99 standard).
6449 * Complete rewrite of the localedef program to support multibyte character
6450 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6451 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6452 Implemented by Ulrich Drepper.
6454 Bruno Haible significantly improved the generation and use of the data
6455 structures for the wide character tables.
6457 * Plural handling in gettext implemented by Ulrich Drepper.
6459 * The utmp daemon has been removed.
6461 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6463 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6466 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6468 * POSIX barriers implemented by Kaz Kylheku.
6470 * POSIX spawn function family implemented by Ulrich Drepper.
6472 * POSIX spinlocks are now available.
6474 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6476 * the configure option --enable-kernel=X.Y.Z allows to strip out
6477 compatibility for kernel versions before X.Y.Z. This is currently only
6478 implemented for Linux.
6480 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6481 field sin6_scope_id. This means that all programs using IPv6 should be
6482 recompiled. Don't expect binary compatibility with previous glibc
6485 * various conversion modules for IBM character sets contributed by
6488 * IA-64 port by Jes Sorensen and HJ Lu.
6502 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6504 * New xdr functions are added; some rpc functions are now 64bit clean.
6506 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6508 * Fixed known incompatibilities with glibc 2.0.
6510 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6512 * Optimized a number of functions (especially the ELF dynamic loader).
6514 * Update timezone data files.
6516 * lots of charmaps corrections
6518 * some new locale definitions and charmaps
6523 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6524 conform to POSIX member type requirements. Symbol versions have been
6525 adjusted as needed within the library, and for direct use by applications,
6526 but there is potential for problems if third-party libraries use
6527 struct timeval as part of their interface. This does not present
6528 a problem for X and other "essential" system libraries.
6530 * An additional locale model to support C++ Standard Library locale
6531 model and probably more was implemented by Ulrich Drepper.
6533 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6536 * Miles Bader provided the `argp' function family to support hierarchical
6537 command line argument parsing, layered on top of getopt.
6539 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6541 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6544 * scanf recognizes the %a and %A format for scanning floating point numbers.
6546 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6547 information and interfaces for the available integer types.
6549 * about 130 new math functions were added to implement the ISO C9x math
6552 * the new header <complex.h> contains definitions of the complex math
6553 functions from ISO C 9X.
6555 * the new header <tgmath.h> defines generic macros to use complex or
6556 real valued functions.
6558 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6560 * Andreas Jaeger provided a test suite for the math library.
6562 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6564 * Ulrich Drepper added character set conversion functions (iconv).
6566 * Optimized string functions have been added.
6568 * The localedata addon is now part of glibc.
6570 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6572 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6573 daemon for NSS (nscd).
6575 Missing a better place here are some numbers on improvements. Under
6576 Linux 2.1.125 un-tar-ing the kernel sources takes
6580 using local files 12.19s 6.88s 22.91s
6582 using NIS 13.92s 8.91s 26.34s
6584 using NIS & nscd 10.37s 7.34s 25.30s
6586 using NIS+ 27.57s 30.37s 640.46s
6588 using NIS+ & nscd 10.25s 7.83s 26.51s
6590 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6592 Keep in mind that non-namelookup related operations dominate above times.
6593 It was just a common complain that using NIS+ unpacking the kernel is
6596 [1] The old nscd implementation is not available anymore since it was
6597 distributed with glibc up to version 2.0.98 and thus is now replaced.
6599 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6601 * Mark Kettenis provided a Hesiod NSS module.
6603 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6604 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6606 * rcmd can now handle netgroups (Dick Streefland).
6608 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6611 * Support for the IPv6 protocol has been added to the socket API, as per the
6612 latest draft standards.
6614 * Support for Linux 2.2 has been added.
6616 * Interface changes relative to the latest 2.0.x release:
6617 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6618 addseverity NEW: Unix98
6619 alphasort64 NEW: LFS
6620 argp_err_exit_status NEW: argp, GNU ext
6621 argp_error NEW: argp, GNU ext
6622 argp_failure NEW: argp, GNU ext
6623 argp_help NEW: argp, GNU ext
6624 argp_parse NEW: argp, GNU ext
6625 argp_program_bug_address NEW: argp, GNU ext
6626 argp_program_version NEW: argp, GNU ext
6627 argp_program_version_hook NEW: argp, GNU ext
6628 argp_state_help NEW: argp, GNU ext
6629 argp_usage NEW: argp, GNU ext
6630 authdes_create NEW: Secure RPC
6631 authdes_getucred NEW: Secure RPC
6632 authdes_pk_create NEW: Secure RPC
6633 backtrace NEW: GNU ext.
6634 backtrace_symbols NEW: GNU ext.
6635 backtrace_symbols_fd NEW: GNU ext.
6637 cacosf NEW: ISO C 9x
6638 cacosh NEW: ISO C 9x
6639 cacoshf NEW: ISO C 9x
6640 cacoshl NEW: ISO C 9x
6641 cacosl NEW: ISO C 9x
6648 casinf NEW: ISO C 9x
6649 casinh NEW: ISO C 9x
6650 casinhf NEW: ISO C 9x
6651 casinhl NEW: ISO C 9x
6652 casinl NEW: ISO C 9x
6654 catanf NEW: ISO C 9x
6655 catanh NEW: ISO C 9x
6656 catanhf NEW: ISO C 9x
6657 catanhl NEW: ISO C 9x
6658 catanl NEW: ISO C 9x
6659 cbc_crypt NEW: Secure RPC
6663 ccoshf NEW: ISO C 9x
6664 ccoshl NEW: ISO C 9x
6670 cimagf NEW: ISO C 9x
6671 cimagl NEW: ISO C 9x
6672 clearerr_locked REMOVED
6673 clntunix_create NEW: sunrpc ext
6675 clog10 NEW: ISO C 9x
6676 clog10f NEW: ISO C 9x
6677 clog10l NEW: ISO C 9x
6687 cprojf NEW: ISO C 9x
6688 cprojl NEW: ISO C 9x
6690 crealf NEW: ISO C 9x
6691 creall NEW: ISO C 9x
6696 csinhf NEW: ISO C 9x
6697 csinhl NEW: ISO C 9x
6700 csqrtf NEW: ISO C 9x
6701 csqrtl NEW: ISO C 9x
6705 ctanhf NEW: ISO C 9x
6706 ctanhl NEW: ISO C 9x
6708 des_setparity NEW: Secure RPC
6709 ecb_crypt NEW: Secure RPC
6710 endutxent NEW: Unix98
6712 exp10f NEW: ISO C 9x
6713 exp10l NEW: ISO C 9x
6717 fattach NEW: STREAMS
6718 fdetach NEW: STREAMS
6722 feclearexcept NEW: ISO C 9x
6723 fegetenv NEW: ISO C 9x
6724 fegetexceptflag NEW: ISO C 9x
6725 fegetround NEW: ISO C 9x
6726 feholdexcept NEW: ISO C 9x
6728 feraiseexcept NEW: ISO C 9x
6729 ferror_locked REMOVED
6730 fesetenv NEW: ISO C 9x
6731 fesetexceptflag NEW: ISO C 9x
6732 fesetround NEW: ISO C 9x
6733 fetestexcept NEW: ISO C 9x
6734 feupdateenv NEW: ISO C 9x
6735 fflush_locked REMOVED
6739 fgets_unlocked NEW: GNU ext.
6740 fileno_locked REMOVED
6752 fputc_locked REMOVED
6753 fputs_unlocked NEW: GNU ext.
6754 fread_unlocked NEW: GNU ext.
6759 fstatvfs NEW: Unix98
6763 ftruncate64 NEW: LFS
6765 fwrite_unlocked NEW: GNU ext.
6766 gai_strerror NEW: IPv6
6770 getchar_locked REMOVED
6772 getdate_err NEW: Unix98
6773 getdate_r NEW: GNU ext.
6775 getnameinfo NEW: IPv6
6776 getnetname NEW: Secure RPC
6777 getpmsg NEW: STREAMS
6778 getpt NEW: Unix98 PTY
6779 getrlimit64 NEW: LFS
6780 getutxent NEW: Unix98
6781 getutxid NEW: Unix98
6782 getutxline NEW: Unix98
6783 glob64 NEW: GNU ext.
6784 globfree64 NEW: GNU ext.
6785 gnu_get_libc_release NEW: GNU ext.
6786 gnu_get_libc_version NEW: GNU ext.
6787 grantpt NEW: Unix98 PTY
6788 host2netname NEW: Secure RPC
6790 iconv_close NEW: iconv
6791 iconv_open NEW: iconv
6792 if_freenameindex NEW: IPv6
6793 if_indextoname NEW: IPv6
6794 if_nameindex NEW: IPv6
6795 if_nametoindex NEW: IPv6
6796 in6addr_any NEW: IPv6
6797 in6addr_loopback NEW: IPv6
6798 inet6_isipv4mapped NEW: IPv6
6799 isastream NEW: STREAMS
6800 iswblank NEW: GNU ext.
6801 key_decryptsession NEW: Secure RPC
6802 key_decryptsession_pk NEW: Secure RPC
6803 key_encryptsession NEW: Secure RPC
6804 key_encryptsession_pk NEW: Secure RPC
6805 key_gendes NEW: Secure RPC
6806 key_get_conv NEW: Secure RPC
6807 key_secretkey_is_set NEW: Secure RPC
6808 key_setnet NEW: Secure RPC
6809 key_setsecret NEW: Secure RPC
6810 llrint NEW: ISO C 9x
6811 llrintf NEW: ISO C 9x
6812 llrintl NEW: ISO C 9x
6813 llround NEW: ISO C 9x
6814 llroundf NEW: ISO C 9x
6815 llroundl NEW: ISO C 9x
6820 lrintf NEW: ISO C 9x
6821 lrintl NEW: ISO C 9x
6822 lround NEW: ISO C 9x
6823 lroundf NEW: ISO C 9x
6824 lroundl NEW: ISO C 9x
6826 makecontext NEW: Unix98
6827 mempcpy NEW: GNU ext.
6830 modify_ldt NEW: kernel
6834 nearbyint NEW: ISO C 9x
6835 nearbyintf NEW: ISO C 9x
6836 nearbyintl NEW: ISO C 9x
6837 netname2host NEW: Secure RPC
6838 netname2user NEW: Secure RPC
6839 nexttoward NEW: ISO C 9x
6840 nexttowardf NEW: ISO C 9x
6841 nexttowardl NEW: ISO C 9x
6845 passwd2des NEW: Secure RPC
6847 pow10f NEW: GNU ext.
6848 pow10l NEW: GNU ext.
6851 printf_size NEW: GNU ext.
6852 printf_size_info NEW: GNU ext.
6853 profil_counter REMOVED
6854 pthread_mutexattr_getkind_np REPLACED
6855 pthread_mutexattr_setkind_np REPLACED
6856 ptsname NEW: Unix98 PTY
6857 ptsname_r NEW: Unix98 PTY
6859 putchar_locked REMOVED
6860 putgrent NEW: GNU ext.
6862 putpmsg NEW: STREAMS
6863 pututxline NEW: Unix98
6867 readdir64_r NEW: LFS
6868 remquo NEW: ISO C 9x
6869 remquof NEW: ISO C 9x
6870 remquol NEW: ISO C 9x
6872 roundf NEW: ISO C 9x
6873 roundl NEW: ISO C 9x
6875 scalbln NEW: ISO C 9x
6876 scalblnf NEW: ISO C 9x
6877 scalblnl NEW: ISO C 9x
6879 sendfile NEW: kernel
6880 setcontext NEW: Unix98
6881 setrlimit64 NEW: LFS
6882 setutxent NEW: Unix98
6884 sigignore NEW: Unix98
6885 sigqueue NEW: POSIX.1b
6886 sigrelse NEW: Unix98
6887 sigset NEW: POSIX.1b
6888 sigtimedwait NEW: POSIX.1b
6889 sigwaitinfo NEW: POSIX.1b
6890 sincos NEW: GNU ext.
6891 sincosf NEW: GNU ext.
6892 sincosl NEW: GNU ext.
6896 strcasestr NEW: GNU ext.
6897 strtoimax NEW: ISO C 9x
6898 strtoumax NEW: ISO C 9x
6899 strverscmp NEW: GNU ext.
6900 svcauthdes_stats NEW: Secure RPC
6901 svcunix_create NEW: sunrpc etx
6902 svcunixfd_create NEW: sunrpc ext
6903 swapcontext NEW: Unix98
6904 tcgetsid NEW: Unix98 PTY
6905 tdestroy NEW: GNU ext.
6906 tgamma NEW: ISO C 9x
6907 tgammaf NEW: ISO C 9x
6908 tgammal NEW: ISO C 9x
6912 truncf NEW: ISO C 9x
6913 truncl NEW: ISO C 9x
6915 unlockpt NEW: Unix98 PTY
6916 updwtmpx NEW: Unix98
6917 user2netname NEW: Secure RPC
6918 utmpxname NEW: Unix98
6919 versionsort NEW: GNU ext.
6920 versionsort64 NEW: GNU ext.
6922 wcscasecmp NEW: GNU ext.
6923 wcsncasecmp NEW: GNU ext.
6924 wcsnlen NEW: GNU ext.
6925 wcstoimax NEW: ISO C 9x
6926 wcstoll NEW: ISO C 9x
6927 wcstoull NEW: ISO C 9x
6928 wcstoumax NEW: ISO C 9x
6930 wordexp NEW: POSIX.2
6931 wordfree NEW: POSIX.2
6932 write_profiling REMOVED
6933 xdecrypt NEW: Secure RPC
6934 xdr_authdes_cred NEW: Secure RPC
6935 xdr_authdes_verf NEW: Secure RPC
6936 xdr_cryptkeyarg NEW: Secure RPC
6937 xdr_cryptkeyarg2 NEW: Secure RPC
6938 xdr_cryptkeyres NEW: Secure RPC
6939 xdr_getcredres NEW: Secure RPC
6940 xdr_key_netstarg NEW: Secure RPC
6941 xdr_key_netstres NEW: Secure RPC
6942 xdr_keybuf NEW: Secure RPC
6943 xdr_keystatus NEW: Secure RPC
6944 xdr_netnamestr NEW: Secure RPC
6945 xdr_sizeof NEW: Secure RPC
6946 xdr_unixcred NEW: sunrpc ext
6947 xencrypt NEW: Secure RPC
6948 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6959 * inet_ntoa is thread-safe
6961 * updwtmp is moved from libutil to libc
6963 * rewrite of cbrt function
6965 * update of timezone data
6979 * add atoll function
6981 * fix complex problems in Berkeley DB code
6983 * fix math functions
6987 * fixed lots of header problems (especially Linux/GNU specific)
6989 * dynamic loader preserves all registers
6991 * Roland McGrath provided support for handling of auxiliary objects in
6992 the ELF dynamic loader.
6994 * support for parallel builds is improved
6998 * GNU extensions are no longer declared by default. To enable them you
6999 must define the macro `_GNU_SOURCE' in your program or compile with
7002 * The library has changed from using GNU ld symbol aliases to using weak
7003 symbols where available. The ELF object file format supports weak
7004 symbols; GNU ld also supports weak symbols in the a.out format. (There
7005 is also now support for other GNU ld extensions in ELF. Use the
7006 `--with-elf' option to configure to indicate you have ELF, and
7007 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
7008 of many files which contained only symbol aliases, reducing the size of
7009 the source and the compiled library; many other files were renamed to
7010 less cryptic names previously occupied by the symbol alias files.
7011 There is a new header file <elf.h> for programs which operate on
7012 files in the ELF format.
7014 * Converted to Autoconf version 2, so `configure' has more options.
7015 Run `configure --help' to see the details.
7017 * The library can now be configured to build profiling, highly-optimized
7018 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
7019 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
7020 `configure' enable building these extra libraries. The shared library is
7021 built by default when using both ELF and GNU ld. When shared libraries
7022 are enabled, the new library `-ldl' is available for arbitrary run-time
7023 loading of shared objects; its interface is defined in <dlfcn.h>. The
7024 new header file <link.h> gives access to the internals of the run-time
7025 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
7026 application of same name on other systems and it provides information
7027 about dynamically linked binaries.
7029 * The C library now provides the run-time support code for profiling
7030 executables compiled with `-pg'. Programs can control the profiling code
7031 through the interface in <sys/gmon.h>. The `gmon.out' files written by
7032 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
7033 the support for this file format was contributed by David Mosberger-Tang.
7035 * The math code has been replaced with a math library based on fdlibm from
7036 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
7037 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
7038 functions. The math functions now reside in a separate library, so
7039 programs using them will need to use `-lm' their linking commands.
7041 * John C. Bowman contributed optimized ix87 assembler inline functions.
7043 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
7044 mechanism similar to that found in Solaris 2. This is now used for the
7045 group, passwd, hosts, networks, services, protocols, rpc, ethers,
7046 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
7047 file controls what services are used for each individual database. This
7048 works by loading shared libraries with names specified in `nsswitch.conf',
7049 so service modules can be changed or added at any time without even
7050 relinking any program. Currently there are the file, db, and NIS based
7051 NSS services available.
7053 * The new functions `strtoq' and `strtouq' parse integer values from
7054 strings, like `strtol' and `strtoul', but they return `long long int' and
7055 `unsigned long long int' values, respectively (64-bit quantities).
7057 * The new functions `strtof' and `strtold' parse floating-point values from
7058 strings, like `strtod', but they return `float' and `long double' values,
7059 respectively (on some machines `double' and `long double' are the same).
7061 * Ulrich Drepper has contributed new implementations of the floating-point
7062 printing and reading code used in the `printf' family of functions and
7063 `strtod', `strtof', and `strtold'. These new functions are perfectly
7064 accurate, and much faster than the old ones.
7066 * The implementation of the POSIX locale model was completely rewritten by
7067 Ulrich Drepper. This includes the new programs `localedef' and `locale'
7068 to compile the POSIX locale definition.
7070 * The former dummy implementations of the strcoll and strxfrm function are
7071 now replaced by fully functional code contributed by Ulrich Drepper. The
7072 collation information comes from the POSIX locale definitions.
7074 * The new header <langinfo.h> defines an interface for accessing
7075 various locale-dependent data (using the locale chosen with `setlocale').
7077 * Ulrich Drepper has contributed a new suite of functions for operation on
7078 wide-character and multibyte-character strings, in <wchar.h>;
7079 and classification and case conversion of wide characters, in <wctype.h>.
7080 These new functions are conforming to the ISO C, Amendment 1 specification.
7082 * There is now a second implementation of the standard I/O library available.
7083 It comes from GNU libg++ as was written by Per Bothner, heavily modified
7084 by Hongjiu Lu and made thread safe by Ulrich Drepper.
7086 * You can now use positional parameter specifications in format strings
7087 for the `printf' and `scanf' families of functions. For example,
7088 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
7089 ``Number 6, Mr Jones''. This is mainly useful when providing different
7090 format strings for different languages, whose grammars may dictate
7091 different orderings of the values being printed. To support this
7092 feature, the interface for `register_printf_handler' has changed; see
7093 the header file <printf.h> for details.
7095 * The `printf' and `scanf' families of functions now understand a new
7096 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
7097 to group numbers as indicated by the locale; for `scanf' and friends, this
7098 says to accept as valid only a number with all the proper grouping
7099 separators in the right places. In the default "C" locale, numbers are
7100 not grouped; but locales for specific countries will define the usual
7101 conventions (i.e. separate thousands with `,' in the US locale).
7103 * The pgrp functions have been regularized, slightly incompatibly but much
7104 less confusingly. The core functions are now `getpgid' and `setpgid',
7105 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
7106 argument) and BSD `setpgrp' (identical to `setpgid') functions are
7107 provided for compatibility. There is no longer an incompatible `getpgrp'
7108 with an argument declared under _BSD_SOURCE; no BSD code uses it.
7110 * The new header file <fts.h> and suite of functions simplify programs that
7111 operate on directory trees. This code comes from 4.4 BSD.
7113 * The resolver code has been updated from the BIND 4.9.5-P1 release.
7114 Parts of the code were heavily modified by Ulrich Drepper to fit in the
7115 NSS scheme used in glibc.
7117 * There is a new malloc debugging hook `__memalign_hook'.
7119 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
7120 `unsigned int' in <sys/types.h>. These are for compatibility only and
7121 their use is discouraged.
7123 * The `-lmcheck' library to enable standard malloc debugging hooks is now
7124 done differently, so that it works even without GNU ld.
7126 * New function `euidaccess' checks allowed access to a file like `access',
7127 but using the effective IDs instead of the real IDs.
7129 * The time zone data files have been updated for the latest and greatest
7130 local time conventions of the countries of the world.
7132 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7135 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7136 for formatting floating-point numbers. They are provided only for
7137 compatibility; new programs should use `sprintf' instead. There are
7138 also equivalent function for the `long double' floating-point type and
7139 all functions also exist in a reentrant form.
7141 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7142 functions for maintaining the login-record files (primarily of use to
7143 system programs such as `login'), and convenient functions for
7144 allocating and initializing a pseudo-terminal (pty) device.
7146 * Ulrich Drepper has contributed new support for System V style
7147 shared memory and IPC on systems that support it.
7149 * Ulrich Drepper has contributed several miscellaneous new functions found
7150 in System V: The `hsearch' family of functions provide an effective
7151 implementation of hash tables; `a64l' and `l64a' provide a very simple
7152 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7155 * Ulrich Drepper has contributed new reentrant counterparts for the
7156 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7158 * Ulrich Drepper has contributed new, highly-optimized versions of several
7159 string functions for the i486/Pentium family of processors.
7161 * Ulrich Drepper has updated the Linux-specific code, based largely
7162 on work done in Hongjiu Lu's version of GNU libc for Linux.
7163 The GNU library now supports Linux versions 2.0.10 and later,
7164 using the ELF object file format (i[3456]86-*-linux).
7166 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7168 * David Mosberger-Tang and Richard Henderson have ported the C library
7169 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7170 dynamic linking support for ELF/Alpha.
7172 * Richard Henderson contributed several Alpha optimized assembler function
7173 for arithmetic and string handling.
7175 * Ulrich Drepper has contributed a new set of message catalog functions to
7176 support multiple languages using the <libintl.h> interface, for use with
7177 his new package GNU gettext. Translation volunteers have contributed
7178 catalogs of the library's messages in Spanish, German, and Korean.
7180 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7181 program and the `catgets' function for reading the catalog files it
7182 creates. (The <libintl.h> interface is preferred; we include the
7183 <nl_types.h> interface using `catgets' only for source compatibility with
7184 programs already written to use it.)
7186 * New header file <values.h> gives SVID-compatible names for <limits.h>
7189 * Various new macros, declarations, and small header files for compatibility
7192 * New function `group_member' is a convenient way to check if a process has
7193 a given effective group ID.
7195 * When using GCC 2.7 and later, the socket functions are now declared in a
7196 special way so that passing an argument of type `struct sockaddr_in *',
7197 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7198 `struct sockaddr *' type, does not generate a type-clash warning.
7200 * New function `error' declared in header file <error.h> is a convenient
7201 function for printing error messages and optionally exiting; this is the
7202 canonical function used in GNU programs. The new functions `err', `warn',
7203 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7204 doing the same thing.
7206 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7207 POSIX.2 `glob' function to do ~ and {...} expansion.
7209 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7210 `clearenv' which is used in POSIX.9 is also available.
7212 * New function `getsid' returns session ID number on systems that support it.
7214 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7215 files <db.h> and <mpool.h> provide a rich set of functions for several
7216 types of simple databases stored in memory and in files, and <ndbm.h> is
7217 an old `ndbm'-compatible interface using the `db' functions. Link with
7218 `-ldb' to get these functions.
7220 * New macro `strdupa' copies a string like `strdup', but uses local stack
7221 space from `alloca' instead of dynamic heap space from `malloc'.
7223 * New function `strnlen' is like `strlen' but searches only a given maximum
7224 number of characters for the null terminator. `stpncpy', `strndup' and
7225 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7228 * New function `statfs' in header <sys/statfs.h>.
7230 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7231 provide convenient functions for operating on blocks of null-terminated
7234 * A new suite of functions in <utmp.h> handle all the details of reading
7235 and writing the utmp file.
7237 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7240 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7241 completely POSIX compliant and also implemented the extended functionality
7242 to handle alternate digit representation and alternate era date formats.
7244 * Ulrich Drepper provided an implementation of the `strptime' function
7245 defined in XPG4.2 which transforms a string into a `struct tm' value.
7247 * Paul Eggert provided the tzselect shell script as part of the timezone
7248 code. The shell script makes it easy to select the correct timezone
7251 * The implementation of the malloc family of functions is completely replaced
7252 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7253 The implementation uses the mmap function (if available) and it is
7254 optimized for the use in multi threaded programs.
7256 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7257 functions. This new functionality is usable by specifying a special
7258 salt string and it is compatible with implementation on *BSD systems.
7260 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7261 `getsubopt' to handle second level command line options, `bsd_signal'
7262 to access BSD style `signal' functionality, the obsolete `regexp' style
7265 * the `lchown' function is available on system which support this
7268 * The implementation of the shadow password handling function was contributed
7271 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7273 * POSIX.1g support was added. The <sys/select.h> header is available,
7274 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7275 implementation of `getaddrinfo'.
7279 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7281 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7282 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7284 * The new function `daemon' from 4.4 BSD is useful for server programs that
7285 want to put themselves in the background.
7287 * Joel Sherrill has contributed support for several standalone boards that
7288 run without an operating system.
7290 * `printf', `scanf' and friends now accept a `q' type modifier for long
7291 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7293 * All of the code taken from BSD (notably most of the math and networking
7294 routines) has been updated from the BSD 4.4-Lite release.
7296 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7298 * The new functions `getdomainname' and `setdomainname' fetch or change the
7299 YP/NIS domain name. These are system calls which exist on systems which
7302 * The time zone data files have been updated for the latest international
7305 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7306 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7310 * The C library now includes support for Sun RPC, from Sun's free
7311 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7312 are included. (There is still no support for YP.)
7314 * Tom Quinn has contributed a port of the C library to SGI machines running
7315 Irix 4 (mips-sgi-irix4).
7317 * The new `lockf' function is a simplified interface to the locking
7318 facilities of `fcntl', included for compatibility.
7320 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7322 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7324 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7327 * The error message printed by `assert' for a failed assertion now includes
7328 the name of the program (if using GNU ld) and the name of the calling
7329 function (with versions of GCC that support this).
7331 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7333 * The library now includes the <sys/mman.h> header file and memory
7334 management functions `mmap', `munmap', `mprotect', `msync', and
7335 `madvise', on systems that support those facilities.
7337 * The interface for `mcheck' has changed slightly: the function called to
7338 abort the program when an allocation inconsistency is detected now takes
7339 an argument that indicates the type of failure. The new function
7340 `mprobe' lets you request a consistency check for a particular block at
7341 any time (checks are normally done only when you call `free' or `realloc'
7344 * It is now possible to easily cross-compile the C library, building on one
7345 system a library to run on another machine and/or operating system. All
7346 you need to do is set the variable `HOST_CC' in `configparms' to the
7347 native compiler for programs to run on the machine you are building on (a
7348 few generator programs are used on Unix systems); set `CC' to the
7351 * The new function `fexecve' (only implemented on the GNU system) executes
7352 a program file given a file descriptor already open on the file.
7356 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7357 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7359 * You can set the variable `libprefix' in `configparms' to specify a prefix
7360 to be prepended to installed library files; this makes it easy to install
7361 the GNU C library to be linked as `-lgnuc' or whatever.
7363 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7364 copies a limited number of characters from a string, and returns the
7365 address of the last character written.
7367 * You no longer need to check for whether the installed `stddef.h' is
7368 compatible with the GNU C library. configure now checks for you.
7370 * You can now define a per-stream `fileno' function to convert the
7371 stream's cookie into an integral file descriptor.
7373 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7374 allocates zero bytes of storage, and returns a unique pointer which
7375 you can pass to `realloc' or `free'. The behavior is undefined if
7376 you dereference this pointer.
7378 * The C library now runs on Sony NEWS m68k machines running either
7379 NewsOS 3 or NewsOS 4.
7381 * The new `syscall' function is a system-dependent primitive function
7382 for invoking system calls. It has the canonical behavior on Unix
7383 systems, including unreliable return values for some calls (such as
7384 `pipe', `fork' and `getppid').
7386 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7387 to `EAGAIN', which is the preferred name. On systems whose kernels
7388 use two distinct codes, the C library now translates EWOULDBLOCK to
7389 EAGAIN in every system call function.
7393 * The GNU C Library Reference Manual is now distributed with the library.
7394 `make dvi' will produce a DVI file of the printed manual.
7395 `make info' will produce Info files that you can read on line using C-h i
7396 in Emacs or the `info' program.
7397 Please send comments on the manual to bug-glibc-manual@gnu.org.
7399 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7401 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7403 * Jason Merrill has contributed a port to the Sequent Symmetry running
7404 Dynix version 3 (i386-sequent-dynix).
7406 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7407 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7409 * New function `memory_warnings' lets you arrange to get warnings when
7410 malloc is running out of memory to allocate, like Emacs gives you.
7412 * The C library now contains the relocating allocator used in Emacs 19 for
7413 its editing buffers. This allocator (ralloc) minimizes allocation
7414 overhead and fragmentation by moving allocated regions around whenever it
7415 needs to. You always refer to a ralloc'd region with a "handle" (a
7416 pointer to a pointer--an object of type `void **').
7418 * There is a new `printf' format: `%m' gives you the string corresponding
7419 to the error code in `errno'.
7421 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7422 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7423 pass, the `a' modifier says to fill in a `char **' you pass with a
7426 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7427 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7428 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7430 * `mkstemp' is a traditional Unix function to atomically create and open a
7431 uniquely-named temporary file.
7435 * The standard location for the file that says what the local timezone is
7436 has changed again. It is now `/usr/local/etc/localtime' (or more
7437 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7439 * The distribution no longer contains any files with names longer than 14
7442 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7443 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7445 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7449 * The configuration process has changed quite a bit. The `configure'
7450 script is now used just like the configuration scripts for other GNU
7451 packages. The `sysdeps' directory hierarchy is much rearranged.
7452 The file `INSTALL' explains the new scheme in detail.
7454 * The header files no longer need to be processed into ANSI C and
7455 traditional C versions. There is just one set of files to install, and
7456 it will work with ANSI or old C compilers (including `gcc -traditional').
7458 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7459 MIPS DECStation running Ultrix 4.
7461 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7462 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7463 made itself into a shared library.
7465 * Yet further improved support for the i386, running 4.3 BSD-like systems
7466 (such as Mach 3 with the Unix single-server), or System V.
7468 * New function `strncasecmp' to do case-insensitive string comparison
7469 with limited length.
7471 * New function `strsep' is a reentrant alternative to `strtok'.
7473 * New functions `scandir' and `alphasort' for searching directories.
7475 * New function `setenv' is a better interface to `putenv'.
7477 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7478 function for traversing a directory tree.
7480 * The GNU obstack package is now also part of the C library.
7481 The new function `open_obstack_stream' creates a stdio stream that
7482 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7483 formatted output directly to an obstack.
7485 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7486 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7488 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7490 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7491 things to your strings.
7493 * There are some new test programs: test-fseek, testmb, and testrand.
7495 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7496 These ports are not finished, but are a good starting place for really
7497 supporting those systems.
7499 * `/etc/localtime' is now the standard location for the file that says what
7500 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7501 This follows the general principle that `/etc' is the place for all local
7502 configuration files.
7504 * The C library header files now use `extern "C"' when used by the C++
7505 compiler, so the C library should now work with C++ code.
7507 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7508 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7511 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7512 function which uses the `merge sort' algorithm, and is said to be
7513 significantly faster than the old GNU `qsort' function. Merge sort is
7514 now the standard `qsort' function. The new algorithm can require a lot
7515 of temporary storage; so, the old sorting function is called when the
7516 required storage is not available.
7518 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7519 provides the Unix `crypt' function, plus some other entry points.
7521 * The code and header files taken from 4.4 BSD have been updated with the
7522 latest files released from Berkeley.
7524 ----------------------------------------------------------------------
7527 Permission is granted to anyone to make or distribute verbatim copies
7528 of this document as received, in any medium, provided that the
7529 copyright notice and this permission notice are preserved,
7530 thus giving the recipient permission to redistribute in turn.
7532 Permission is granted to distribute modified versions
7533 of this document, or of portions of it,
7534 under the above conditions, provided also that they
7535 carry prominent notices stating who last changed them.
7538 version-control: never