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 [Add new features here]
14 Deprecated and removed features, and other changes affecting compatibility:
16 [Add deprecations, removals and changes affecting compatibility here]
18 Changes to build and runtime requirements:
20 [Add changes to build and runtime requirements here]
22 Security related changes:
24 [Add security related changes here]
26 The following bugs are resolved with this release:
28 [The release manager will add the list generated by
29 scripts/list-fixed-bugs.py just before the release.]
35 * The getent tool now supports the --no-addrconfig option. The output of
36 getent with --no-addrconfig may contain addresses of families not
37 configured on the current host i.e. as-if you had not passed
38 AI_ADDRCONFIG to getaddrinfo calls.
40 Deprecated and removed features, and other changes affecting compatibility:
42 * The dynamic linker no longer loads shared objects from the "tls"
43 subdirectories on the library search path or the subdirectory that
44 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
45 search mechanism, which was deprecated in version 2.33.
47 Security related changes:
49 CVE-2022-39046: When the syslog function is passed a crafted input
50 string larger than 1024 bytes, it reads uninitialized memory from the
51 heap and prints it to the target log file, potentially revealing a
52 portion of the contents of the heap.
54 The following bugs are resolved with this release:
56 [12154] network: Cannot resolve hosts which have wildcard aliases
57 [12165] libc: readdir: Do not skip entries with zero d_ino values
58 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
59 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
60 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
61 AF_INET6 address (ie docker)
62 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
64 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
65 [28937] dynamic-link: New DSO dependency sorter does not put new map
67 [29249] libc: csu/libc-tls.c:202: undefined reference to
68 `_startup_fatal_not_constant'
69 [29305] network: Inefficient buffer space usage in nss_dns for
70 gethostbyname and other functions
71 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
72 [29402] nscd: nscd: No such file or directory
73 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
75 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
76 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
78 [29463] math: math/test-float128-y1 fails on x86_64
79 [29485] build: Make hangs when the test misc/tst-pidfile returns
81 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
83 [29499] build: Check failed on misc/tst-glibcsyscalls while building
84 for RISCV64 on a unmatched hardware
85 [29501] build: Check failed on stdlib/tst-strfrom while building for
86 RISCV64 on a unmatched hardware
87 [29502] libc: alpha sys/acct.h out of date
88 [29514] build: Need to use -fPIE not -fpie
89 [29528] dynamic-link: __libc_early_init not called after dlmopen that
91 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
92 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
94 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
96 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
98 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
99 [29576] build: librtld.os: in function `_dl_start_profile':
100 (.text+0x9444): undefined reference to `strcpy'
101 [29578] libc: Definition of SUN_LEN() is wrong
102 [29583] build: iconv failures on 32bit platform due to missing large
104 [29600] dynamic-link: dlmopen hangs after loading certain libraries
105 [29604] localedata: Update locale data to Unicode 15.0.0
106 [29605] nscd: Regression in NSCD backend of getaddrinfo
107 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
109 [29611] string: Optimized AVX2 string functions unconditionally use
111 [29624] malloc: errno is not cleared when entering main
112 [29638] libc: stdlib: arc4random fallback is never used
113 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
115 [29698] build: Configuring for AArch32 on ARMv8+ disables
117 [29727] locale: __strtol_internal out-of-bounds read when parsing
119 [29730] libc: broken y2038 support in fstatat on MIPS N64
120 [29746] libc: ppoll() does not switch to __ppoll64 when
121 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
122 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
123 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
124 aux.S: No such file or directory)
125 [29864] libc: __libc_start_main() should obtain program headers
126 address (_dl_phdr) from the auxv, not the ELF header.
127 [29951] time: daylight variable not set correctly if last DST change
128 coincides with offset change
129 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
130 length in fortify mode
136 * Support for DT_RELR relative relocation format has been added to
137 glibc. This is a new ELF dynamic tag that improves the size of
138 relative relocations in shared object files and position independent
139 executables (PIE). DT_RELR generation requires linker support for
140 -z pack-relative-relocs option, which is supported for some targets
141 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
143 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
144 have been added. The pidfd functionality provides access to a process
145 while avoiding the issue of PID reuse on tranditional Unix systems.
147 * On Linux, the process_madvise function has been added. It has the
148 same functionality as madvise but alters the target process identified
151 * On Linux, the process_mrelease function has been added. It allows a
152 caller to release the memory of a dying process. The release of the
153 memory is carried out in the context of the caller, using the caller's
154 CPU affinity, and priority with CPU usage accounted to the caller.
156 * The “no-aaaa” DNS stub resolver option has been added. System
157 administrators can use it to suppress AAAA queries made by the stub
158 resolver, including AAAA lookups triggered by NSS-based interfaces
159 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
160 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
161 produce IPv6 addresses, and configured IPv6 name servers are still
162 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
163 are translated to A queries. The new resolver option is intended
164 primarily for diagnostic purposes, to rule out that AAAA DNS queries
165 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
166 validation by applications.
168 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
169 and mount_setattr have been added. They are part of the new Linux kernel
170 mount APIs that allow applications to more flexibly configure and operate
171 on filesystem mounts. The new mount APIs are specifically designed to work
174 * localedef now accepts locale definition files encoded in UTF-8.
175 Previously, input bytes not within the ASCII range resulted in
176 unpredictable output.
178 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
179 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
180 Support for the char8_t typedef has been added per the ISO C2X N2653
181 proposal. The functions are declared in uchar.h in C2X mode or when the
182 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
183 The char8_t typedef is declared in uchar.h in C2X mode or when the
184 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
185 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
187 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
188 added. The functions wrap getrandom and/or /dev/urandom to return high-
189 quality randomness from the kernel.
191 * Support for LoongArch running on Linux has been added. This port requires
192 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
195 - loongarch64-linux-gnu
197 The LoongArch ABI is 64-bit little-endian.
199 Deprecated and removed features, and other changes affecting compatibility:
201 * Support for prelink will be removed in the next release; this includes
202 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
203 variables and their functionality in the dynamic loader.
205 * The Linux kernel version check has been removed along with the
206 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
207 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
208 when libc.so is issued directly.
210 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
212 The following bugs are resolved with this release:
214 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
215 return different result with versioned "foo"
216 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
218 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
219 ./exe and ld.so adjusts argv on the stack
220 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
222 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
223 consuming the second byte of certain double byte characters
224 [25812] stdio: Libio vtable protection is sometimes only partially
226 [27054] libc: pthread_atfork handlers that call pthread_atfork
228 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
230 [28128] build: declare_symbol_alias doesn't work for assembly codes
231 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
232 [28752] nss: Segfault in getpwuid when stat fails
233 [28815] libc: realpath should not copy to resolved buffer on error
234 [28828] stdio: fputwc crashes
235 [28838] libc: FAIL: elf/tst-p_align3
236 [28845] locale: ld-monetary.c should be updated to match ISO C and
238 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
240 [28852] libc: getaddrinfo leaks memory with AI_ALL
241 [28853] libc: tst-spawn6 changes current foreground process group
242 (breaks test isolation)
243 [28857] libc: FAIL: elf/tst-audit24a
244 [28860] build: --enable-kernel=5.1.0 build fails because of missing
245 __convert_scm_timestamps
246 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
247 inaccurate without /sys and /proc
248 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
250 [28880] libc: Program crashes if date beyone 2038
251 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
252 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
253 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
254 rtm variants when avoiding overflow
255 [28922] build: The .d dependency files aren't always generated
256 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
258 [28936] build: nm: No such file
259 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
260 [28953] nss: NSS lookup result can be incorrect if function lookup
262 [28970] math: benchtest: libmvec benchmark doesn't build with make
264 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
265 /sys/devices/system/cpu/possible
266 [28993] libc: closefrom() iterates until max int if no access to
268 [28996] libc: realpath fails to copy partial result to resolved buffer
270 [29027] math: [ia64] fabs fails with sNAN input
271 [29029] nptl: poll() spuriously returns EINTR during thread
272 cancellation and with cancellation disabled
273 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
274 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
275 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
276 is promoted to global scope
277 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
278 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
279 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
281 [29097] time: fchmodat does not handle 64 bit time_t for
283 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
285 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
286 [29162] string: [PATCH] string.h syntactic error:
287 include/bits/string_fortified.h:110: error: expected ',' or ';'
288 before '__fortified_attr_access'
289 [29165] libc: [Regression] broken argv adjustment
290 [29187] dynamic-link: [regression] broken argv adjustment for nios2
291 [29193] math: sincos produces a different output than sin/cos
292 [29197] string: __strncpy_power9() uses uninitialised register vs18
293 value for filling after \0
294 [29203] libc: daemon is not y2038 aware
295 [29204] libc: getusershell is not 2038 aware
296 [29207] libc: posix_fallocate fallback implementation is not y2038
298 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
299 [29209] libc: isfdtype is not y2038 aware
300 [29210] network: ruserpass is not y2038 aware
301 [29211] libc: __open_catalog is not y2038 aware
302 [29213] libc: gconv_parseconfdir is not y2038 aware
303 [29214] nptl: pthread_setcanceltype fails to set type
304 [29225] network: Mistyped define statement in socket/sys/socket.h in
306 [29274] nptl: __read_chk is not a cancellation point
307 [29279] libc: undefined reference to `mbstowcs_chk' after
308 464d189b9622932a75302290625de84931656ec0
309 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
310 correct for !__ASSUME_TIME64_SYSCALLS
311 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
312 missing on microblaze with largefile
318 * Unicode 14.0.0 Support: Character encoding, character type info, and
319 transliteration tables are all updated to Unicode 14.0.0, using
320 generator scripts contributed by Mike FABIAN (Red Hat).
322 * Bump r_version in the debugger interface to 2 and add a new field,
323 r_next, support multiple namespaces.
325 * Support for the C.UTF-8 locale has been added to glibc. The locale
326 supports full code-point sorting for all valid Unicode code points. A
327 limitation in the framework for fnmatch, regexec, and regcomp requires
328 a compromise to save space and only ASCII-based range expressions are
329 supported for now (see bug 28255). The full size of the locale is
330 only ~400KiB, with 346KiB coming from LC_CTYPE information for
331 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
332 in various downstream distributions. The locale is not built into
333 glibc, and must be installed.
335 * <math.h> functions that round their results to a narrower type, and
336 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
337 18661-3:2015 and draft ISO C2X:
339 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
340 fMxsqrtfN and fMxsqrtfNx functions.
342 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
345 * <math.h> functions for floating-point maximum and minimum,
346 corresponding to new operations in IEEE 754-2019, and corresponding
347 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
348 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
349 fminimum_mag, fminimum_mag_num and corresponding functions for float,
350 long double, _FloatN and _FloatNx.
352 * <math.h> macros for single-precision float constants are added as a
353 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
354 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
357 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
358 predefined as specified in TS 18661-1:2014.
360 * The exp10 functions in <math.h> now have a corresponding type-generic
363 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
365 * printf-family functions now support the %b format for output of
366 integers in binary, as specified in draft ISO C2X, and the %B variant
367 of that format recommended by draft ISO C2X.
369 * A new DSO sorting algorithm has been added in the dynamic linker that uses
370 topological sorting by depth-first search (DFS), solving performance issues
371 of the existing sorting algorithm when encountering particular circular
372 object dependency cases.
374 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
375 the two DSO sorting algorithms. The default setting of '2' uses the
376 new DFS-based algorithm. The setting '1' switches to the old
377 algorithm used in glibc 2.33 and earlier.
379 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
380 to be used by compilers for optimizing usage of 'memcmp' when its
381 return value is only used for its boolean status.
383 * Support for automatically registering threads with the Linux rseq
384 system call has been added. This system call is implemented starting
385 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
386 operations on per-cpu data. It allows user-space to perform updates
387 on per-cpu data without requiring heavy-weight atomic operations.
388 Automatically registering threads allows all libraries, including
389 libc, to make immediate use of the rseq support by using the
390 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
391 variables. The GNU C Library manual has details on integration of
392 Restartable Sequences.
394 * A symbolic link to the dynamic linker is now installed under
395 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
397 * All programs and the testsuite in glibc are now built as position independent
398 executables (PIE) by default on toolchains and architectures that support it.
399 Further, if the toolchain and architecture supports it, even static programs
400 are built as PIE and the resultant glibc can be used to build static PIE
401 executables. A new option --disable-default-pie has been added to disable
402 this behavior and get a non-PIE build. This option replaces
403 --enable-static-pie, which no longer has any effect on the build
406 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
407 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
408 or to use huge pages directly with mmap calls with the MAP_HUGETLB
409 flags). The former can improve performance when Transparent Huge Pages
410 is set to 'madvise' mode while the latter uses the system reserved
413 * The printf family of functions now handles the flagged %#m conversion
414 specifier, printing errno as an error constant (similar to strerrorname_np).
416 * The function _dl_find_object has been added. In-process unwinders
417 can use it to efficiently locate unwinding information for a code
420 * Support for OpenRISC running on Linux has been added. This port requires
421 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
426 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
427 64-bit file offsets (LFS default).
429 * A new configure option, --with-rtld-early-cflags, can be used to
430 specify additional compiler flags for building the early startup code
431 of the dynamic linker. On targets which have CPU compatibility
432 checks, this can help to ensure that proper diagnostics are printed if
433 the dynamic loader runs on an incompatible CPU.
435 * On Linux, the epoll_pwait2 function has been added. It is similar to
436 epoll_wait with the difference the timeout has nanoseconds resolution.
438 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
439 enabling posix_spawn and posix_spawnp to set the controlling terminal in
440 the new process in a race free manner. This function is a GNU extension.
442 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
443 applications compiling with glibc and gcc 12 and later. Level 3 leverages
444 the __builtin_dynamic_object_size function to deliver additional
445 fortification balanced against additional runtime cost (checking non-constant
448 * The audit libraries will avoid unnecessary slowdown if it is not required
449 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
451 Deprecated and removed features, and other changes affecting compatibility:
453 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
454 has been removed since the first PT_LOAD segment is no longer executable
455 due to defaulting to -z separate-code.
457 * The r_version update in the debugger interface makes the glibc binary
458 incompatible with GDB binaries built without the following commits:
460 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
461 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
463 when audit modules or dlmopen are used.
465 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
467 * The --enable-static-pie option is no longer available. The glibc build
468 configuration script now automatically detects static-pie support in the
469 toolchain and architecture and enables it if available.
471 * The catchsegv script and associated libSegFault.so shared object have
472 been removed. There are widely-deployed out-of-process alternatives for
473 catching coredumps and backtraces.
475 * Support for prelink will be removed in the next release; this includes
476 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
477 variables and their functionality in the dynamic loader.
479 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
480 functionality to obtain the program mapping address can be achieved by
481 using LD_TRACE_LOADED_OBJECTS to value of 2.
483 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
484 support prelink PIE binaries.
486 Changes to build and runtime requirements:
488 * The audit module interface version LAV_CURRENT is increased to enable
489 proper bind-now support. The loader now advertises via the la_symbind
490 flags that PLT trace is not possible. New audit modules require the
491 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
492 modules are still loaded for all targets except aarch64.
494 * The audit interface on aarch64 is extended to support both the indirect
495 result location register (x8) and NEON Q register. Old audit modules are
496 rejected by the loader. Audit modules must be rebuilt to use the newer
497 structure sizes and the latest module interface version for LAV_CURRENT.
499 Security related changes:
501 CVE-2022-23219: Passing an overlong file name to the clnt_create
502 legacy function could result in a stack-based buffer overflow when
503 using the "unix" protocol. Reported by Martin Sebor.
505 CVE-2022-23218: Passing an overlong file name to the svcunix_create
506 legacy function could result in a stack-based buffer overflow.
508 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
509 function could result in a memory leak and potential access of
510 uninitialized memory. Reported by Qualys.
512 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
513 function may result in an off-by-one buffer underflow and overflow
514 when the current working directory is longer than PATH_MAX and also
515 corresponds to the / directory through an unprivileged mount
516 namespace. Reported by Qualys.
518 The following bugs are resolved with this release:
520 [12889] nptl: Race condition in pthread_kill
521 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
522 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
523 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
525 [15333] libc: Use 64-bit stat functions in installed programs
526 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
528 [15971] dynamic-link: No interface for debugger access to libraries
530 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
531 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
532 deeply nested DSO dependencies.
533 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
534 ID whose lifetime has not ended
535 [22542] network: buffer overflow in sunrpc clnt_create
537 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
539 [25947] malloc: memory leak in muntrace
540 [26045] math: fmaxf(inf, nan) does not always work
541 [26108] math: exp10() has problems with <tgmath.h>
542 [26779] build: benign use after realloc at localealias.c:329
543 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
544 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
545 [27945] build: build-many-glibcs.py doesn't configure GCC with
546 --enable-initfini-array
547 [27991] build: x86: sysdeps/x86/configure.ac breaks when
548 libc_cv_include_x86_isa_level is loaded from cache
549 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
550 in __REDIRECT_NTH macro
551 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
552 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
554 [28126] libc: nftw aborts for paths longer than PATH_MAX
555 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
556 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
558 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
559 [28185] math: Inaccurate j0f function (again)
560 [28199] locale: iconvconfig prefix flag behaves differently in glibc
562 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
563 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
565 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
566 [28223] libc: mips: clone does not align stack
567 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
569 [28256] malloc: Conditional jump or move depends on uninitialised
570 value(s) in __GI___tunables_init
571 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
572 spawn5 fail if stray fds are open
573 [28310] libc: Do not use affinity mask for sysconf
574 (_SC_NPROCESSORS_CONF)
575 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
577 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
579 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
580 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
582 [28353] network: Race condition on __opensock
583 [28357] dynamic-link: deadlock between pthread_create and ctors
584 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
585 [28361] nptl: Fix for bug 12889 causes setxid deadlock
586 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
587 [28390] localedata: Update locale data to Unicode 14.0.0
588 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
590 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
592 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
593 to tgkill (getpid (), gettid())
594 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
595 [28457] dynamic-link: Missing reldepmod4.so dependency for
597 [28469] time: linux: struct timex is not correctly set for 32-bit
598 systems with TIMESIZE=64
599 [28470] regex: Buffer read overrun in regular expression searching
600 [28475] string: Incorrect access attribute on memfrob
601 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
602 spurious NUL character on state reset
603 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
605 [28550] dynamic-link: FAIL: tst-dso-
606 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
608 [28554] build: Undefined generate-md5
609 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
611 [28607] nptl: Masked signals are delivered on thread exit
612 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
613 lack of cpu counting /proc fallback with glibc 2.34
614 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
615 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
616 [28648] dynamic-link: Running ld.so on statically linked binaries
618 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
620 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
621 [28678] nptl: nptl/tst-create1 hangs sporadically
622 [28688] dynamic-link: PT_LOAD p_align check is too strict
623 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
625 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
626 timezones generated by tzcode-2021d and later
627 [28713] math: GCC 12 miscompiles libm
628 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
629 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
630 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
631 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
632 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
633 Assertion `GL(dl_rtld_map).l_libname' failed!
634 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
635 [28757] nptl: GDB printer tests failed with new GDB
636 [28765] math: x86_64 libmvec atan2 accuracy
637 [28766] manual: Document libmvec accuracy
638 [28768] network: Buffer overflow in svcunix_create with long pathnames
640 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
642 [28770] libc: Unexpected return value from realpath() for too long
643 results (CVE-2021-3998)
644 [28771] libc: %ebx optimization macros are incompatible with .altmacro
646 [28780] build: --disable-default-pie doesn't work on static programs
647 [28782] libc: x86-64 ISA level for glibc itself is always
649 [28792] glob: possible wrong behaviour with patterns with double [
651 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
652 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
653 empty mon_decimal_point_wc
660 * In order to support smoother in-place-upgrades and to simplify
661 the implementation of the runtime all functionality formerly
662 implemented in the libraries libpthread, libdl, libutil, libanl has
663 been integrated into libc. New applications do not need to link with
664 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
665 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
666 provided, so that the linker options keep working. Applications which
667 have been linked against glibc 2.33 or earlier continue to load the
668 corresponding shared objects (which are now empty). The integration
669 of those libraries into libc means that additional symbols become
670 available by default. This can cause applications that contain weak
671 references to take unexpected code paths that would only have been
672 used in previous glibc versions when e.g. preloading libpthread.so.0,
673 potentially exposing application bugs.
675 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
676 PTHREAD_STACK_MIN is no longer constant and is redefined to
677 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
678 sets for modern architectural features like Arm SVE.
680 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
681 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
682 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
683 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
684 dynamic sized register sets for modern architectural features like
687 * The dynamic linker implements the --list-diagnostics option, printing
688 a dump of information related to IFUNC resolver operation and
689 glibc-hwcaps subdirectory selection.
691 * On Linux, the function execveat has been added. It operates similar to
692 execve and it is is already used to implement fexecve without requiring
693 /proc to be mounted. However, different than fexecve, if the syscall is not
694 supported by the kernel an error is returned instead of trying a fallback.
696 * The ISO C2X function timespec_getres has been added.
698 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
699 C2X, is supported to enable declarations of functions defined in Annex F
700 of C2X. Those declarations are also enabled when
701 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
702 defined, and when _GNU_SOURCE is defined.
704 * On powerpc64*, glibc can now be compiled without scv support using the
705 --disable-scv configure option.
707 * Add support for 64-bit time_t on configurations like x86 where time_t
708 is traditionally 32-bit. Although time_t still defaults to 32-bit on
709 these configurations, this default may change in future versions.
710 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
711 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
712 only enabled for Linux and the full support requires a minimum kernel
715 * The main gconv-modules file in glibc now contains only a small set of
716 essential converter modules and the rest have been moved into a supplementary
717 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
718 in the same GCONV_PATH. Similarly, external converter modules directories
719 may have supplementary configuration files in a gconv-modules.d directory
720 with names ending with .conf to logically classify the converter modules in
723 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
724 to configure the size of the thread stack cache.
726 * The function _Fork has been added as an async-signal-safe fork replacement
727 since Austin Group issue 62 droped the async-signal-safe requirement for
728 fork (and it will be included in the future POSIX standard). The new _Fork
729 function does not run any atfork function neither resets any internal state
730 or lock (such as the malloc one), and only sets up a minimal state required
731 to call async-signal-safe functions (such as raise or execve). This function
732 is currently a GNU extension.
734 * On Linux, the close_range function has been added. It allows efficiently
735 closing a range of file descriptors on recent kernels (version 5.9).
737 * The function closefrom has been added. It closes all file descriptors
738 greater than or equal to a given integer. This function is a GNU extension,
739 although it is also present in other systems.
741 * The posix_spawn_file_actions_addclosefrom_np function has been added,
742 enabling posix_spawn and posix_spawnp to close all file descriptors greater
743 than or equal to a given integer. This function is a GNU extension,
744 although Solaris also provides a similar function.
746 * When invoked explicitly, the dynamic linker now uses the kernel to
747 execute programs that do not have any dynamic dependency (that is,
748 they are statically linked). This feature is Linux-specific.
750 Deprecated and removed features, and other changes affecting compatibility:
752 * The function pthread_mutex_consistent_np has been deprecated; programs
753 should use the equivalent standard function pthread_mutex_consistent
756 * The function pthread_mutexattr_getrobust_np has been deprecated;
757 programs should use the equivalent standard function
758 pthread_mutexattr_getrobust instead.
760 * The function pthread_mutexattr_setrobust_np has been deprecated;
761 programs should use the equivalent standard function
762 pthread_mutexattr_setrobust instead.
764 * The function pthread_yield has been deprecated; programs should use
765 the equivalent standard function sched_yield instead.
767 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
769 * Various rarely-used functions declared in <resolv.h> and
770 <arpa/nameser.h> have been deprecated. Applications are encouraged to
771 use dedicated DNS processing libraries if applicable. For <resolv.h>,
772 this affects the functions dn_count_labels, fp_nquery, fp_query,
773 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
774 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
775 p_type, putlong, putshort, res_hostalias, res_isourserver,
776 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
777 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
778 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
779 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
781 * Various symbols previously defined in libresolv have been moved to libc
782 in order to prepare for libresolv moving entirely into libc (see earlier
783 entry for merging libraries into libc). The symbols __dn_comp,
784 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
785 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
786 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
787 __res_search, __res_send formerly in libresolv have been renamed and no
788 longer have a __ prefix. They are now available in libc.
790 * The pthread cancellation handler is now installed with SA_RESTART and
791 pthread_cancel will always send the internal SIGCANCEL on a cancellation
792 request. It should not be visible to applications since the cancellation
793 handler should either act upon cancellation (if asynchronous cancellation
794 is enabled) or ignore the cancellation internal signal. However there are
795 buggy kernel interfaces (for instance some CIFS versions) that could still
796 see a spurious EINTR error when cancellation interrupts a blocking syscall.
798 * Previously, glibc installed its various shared objects under versioned
799 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
800 were provided as symbolic links. Starting with glibc 2.34, the shared
801 objects are installed under their ABI sonames directly, without
802 symbolic links. This increases compatibility with distribution
803 package managers that delete removed files late during the package
804 upgrade or downgrade process.
806 * The symbols mallwatch and tr_break are now deprecated and no longer used in
807 mtrace. Similar functionality can be achieved by using conditional
808 breakpoints within mtrace functions from within gdb.
810 * The __morecore and __after_morecore_hook malloc hooks and the default
811 implementation __default_morecore have been removed from the API. Existing
812 applications will continue to link against these symbols but the interfaces
813 no longer have any effect on malloc.
815 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
816 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
817 disabled by default in the main C library. Users looking to use these
818 features now need to preload a new debugging DSO libc_malloc_debug.so to get
819 this functionality back.
821 * The deprecated functions malloc_get_state and malloc_set_state have been
822 moved from the core C library into libc_malloc_debug.so. Legacy applications
823 that still use these functions will now need to preload libc_malloc_debug.so
824 in their environment using the LD_PRELOAD environment variable.
826 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
827 __memalign_hook and __free_hook are now removed from the API. Compatibility
828 symbols are present to support legacy programs but new applications can no
829 longer link to these symbols. These hooks no longer have any effect on glibc
830 functionality. The malloc debugging DSO libc_malloc_debug.so currently
831 supports hooks and can be preloaded to get this functionality back for older
832 programs. However this is a transitional measure and may be removed in a
833 future release of the GNU C Library. Users may port away from these hooks by
834 writing and preloading their own malloc interposition library.
836 Changes to build and runtime requirements:
838 * On Linux, the shm_open, sem_open, and related functions now expect the
839 file shared memory file system to be mounted at /dev/shm. These functions
840 no longer search among the system's mount points for a suitable
841 replacement if /dev/shm is not available.
843 Security related changes:
845 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
846 a request for netgroup lookup, may crash due to a double-free,
847 potentially resulting in degraded service or Denial of Service on the
848 local system. Reported by Chris Schanzle.
850 CVE-2021-33574: The mq_notify function has a potential use-after-free
851 issue when using a notification type of SIGEV_THREAD and a thread
852 attribute with a non-default affinity mask.
854 CVE-2021-35942: The wordexp function may overflow the positional
855 parameter number when processing the expansion resulting in a crash.
856 Reported by Philippe Antoine.
858 The following bugs are resolved with this release:
860 [4737] libc: fork is not async-signal-safe
861 [5781] math: Slow dbl-64 sin/cos/sincos for special values
862 [10353] libc: Methods for deleting all file descriptors greater than
863 given integer (closefrom)
864 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
865 name containing multi-byte character(s)
866 [14469] math: Inaccurate j0f function
867 [14470] math: Inaccurate j1f function
868 [14471] math: Inaccurate y0f function
869 [14472] math: Inaccurate y1f function
870 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
872 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
873 crashes if it fails dlsym() twice
874 [15648] nptl: multiple definition of `__lll_lock_wait_private'
875 [16063] nptl: Provide a pthread_once variant in libc directly
876 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
877 [17145] libc: syslog with LOG_CONS leaks console file descriptor
878 [17183] manual: description of ENTRY struct in <search.h> in glibc
880 [18435] nptl: pthread_once hangs when init routine throws an exception
881 [18524] nptl: Missing calloc error checking in
882 __cxa_thread_atexit_impl
883 [19329] dynamic-link: dl-tls.c assert failure at concurrent
884 pthread_create and dlopen
885 [19366] nptl: returning from a thread should disable cancellation
886 [19511] nptl: 8MB memory leak in pthread_create in case of failure
887 when non-root user changes priority
888 [20802] dynamic-link: getauxval NULL pointer dereference after static
890 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
891 [22057] malloc: malloc_usable_size is broken with mcheck
892 [22668] locale: LC_COLLATE: the last character of ellipsis is not
894 [23323] libc: [RFE] CSU startup hardening.
895 [23328] malloc: Remove malloc hooks and ensure related APIs return no
897 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
898 $PLATFORM, $ORIGIN) crashes
899 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
900 [23554] nptl: pthread_getattr_np reports wrong stack size with
902 [24106] libc: Bash interpreter in ldd script is taken from host
903 [24773] dynamic-link: dlerror in an secondary namespace does not use
904 the right free implementation
905 [25036] localedata: Update collation order for Swedish
906 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
907 shm_open to pick wrong directory
908 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
909 crash in IFUNC resolver due to stack canary (--enable-stack-
911 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
912 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
913 [27111] dynamic-link: pthread_create and tls access use link_map
914 objects that may be concurrently freed by dlclose
915 [27132] malloc: memusagestat is linked to system librt, leading to
916 undefined symbols on major version upgrade
917 [27136] dynamic-link: dtv setup at thread creation may leave an entry
919 [27249] libc: libSegFault.so does not output signal number properly
920 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
922 [27318] dynamic-link: glibc fails to load binaries when built with
923 -march=sandybridge: CPU ISA level is lower than required
924 [27343] nss: initgroups() SIGSEGVs when called on a system without
925 nsswich.conf (in a chroot)
926 [27346] dynamic-link: x86: PTWRITE feature check is missing
927 [27389] network: NSS chroot hardening causes regressions in chroot
929 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
930 [27444] libc: sysconf reports unsupported option (-1) for
931 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
932 [27462] nscd: double-free in nscd (CVE-2021-27645)
933 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
934 malloc/tst-malloc-thread-fail
935 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
936 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
938 [27522] glob: glob, glob64 incorrectly marked as __THROW
939 [27555] dynamic-link: Static tests fail with --enable-stack-
941 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
942 information for the current directory
943 [27577] dynamic-link: elf/ld.so --help doesn't work
944 [27605] libc: tunables can't control xsave/xsavec selection in
946 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
947 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
949 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
950 _nss_files_getcanonname_r) from within a dlmopen namespace.
951 [27648] libc: FAIL: misc/tst-select
952 [27650] stdio: vfscanf returns too early if a match is longer than
954 [27651] libc: Performance regression after updating to 2.33
955 [27655] string: Wrong size calculation in string/test-strnlen.c
956 [27706] libc: select fails to update timeout on error
957 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
958 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
959 tries resolving them lazily
960 [27744] nptl: Support different libpthread/ld.so load orders in
962 [27749] libc: Data race __run_exit_handlers
963 [27761] libc: getconf: Segmentation fault when passing '-vq' as
965 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
966 exceeds maximum object size 2147483647
967 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
969 [27872] build: Obsolete configure option --enable-stackguard-
971 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
972 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
973 [27892] libc: powerpc: scv ABI error handling fails to check
975 [27896] nptl: mq_notify does not handle separately allocated thread
976 attributes (CVE-2021-33574)
977 [27901] libc: TEST_STACK_ALIGN doesn't work
978 [27902] libc: The x86-64 clone wrapper fails to align child stack
979 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
980 [27939] libc: aarch64: clone does not align the stack
981 [27968] libc: s390x: clone does not align the stack
982 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
983 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
985 [28028] malloc: malloc: tcache shutdown sequence does not work if the
986 thread never allocated anything
987 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
988 [28064] string: x86_64:wcslen implementation list has wcsnlen
989 [28067] libc: FAIL: posix/tst-spawn5
990 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
991 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
993 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
994 [28089] build: tst-tls20 fails when linker defaults to --as-needed
995 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
997 [28091] network: ns_name_skip may return 0 for domain names without
1005 * The dynamic linker accepts the --list-tunables argument which prints
1006 all the supported tunables. This option is disable if glibc is
1007 configured with tunables disabled (--enable-tunables=no).
1009 * The dynamic linker accepts the --argv0 argument and provides opportunity
1010 to change argv[0] string.
1012 * The dynamic linker loads optimized implementations of shared objects
1013 from subdirectories under the glibc-hwcaps directory on the library
1014 search path if the system's capabilities meet the requirements for
1015 that subdirectory. Initially supported subdirectories include
1016 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1017 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1018 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1019 subdirectory names correspond to the vendor-independent x86-64
1020 microarchitecture levels defined in the x86-64 psABI supplement.
1022 * The new --help option of the dynamic linker provides usage and
1023 information and library search path diagnostics.
1025 * The mallinfo2 function is added to report statistics as per mallinfo,
1026 but with larger field widths to accurately report values that are
1027 larger than fit in an integer.
1029 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1031 * Support for the RISC-V ISA running on Linux has been expanded to run on
1032 32-bit hardware. This is supported for the following ISA and ABI pairs:
1038 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1041 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1042 glibc may use additional checks that may have an additional performance
1043 overhead. At present these checks are available only on LLVM 9 and later.
1044 The latest GCC available at this time (10.2) does not support this level of
1047 Deprecated and removed features, and other changes affecting compatibility:
1049 * The mallinfo function is marked deprecated. Callers should call
1052 * When dlopen is used in statically linked programs, alternative library
1053 implementations from HWCAP subdirectories are no longer loaded.
1054 Instead, the default implementation is used.
1056 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1057 removed. To support old binaries, the vtimes function continues to exist
1058 as a compatibility symbol. Applications should use the getrlimit or
1061 * Following a change in the tzdata 2018a release upstream, the zdump
1062 program is now installed in the /usr/bin subdirectory. Previously,
1063 the /usr/sbin subdirectory was used.
1065 * On s390(x), the type float_t is now derived from the macro
1066 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1067 hardcoded to double. This does not affect the ABI of any libraries
1068 that are part of the GNU C Library, but may affect the ABI of other
1069 libraries that use this type in their interfaces. The new definition
1070 improves consistency with compiler behavior in many scenarios.
1072 * A future version of glibc will stop loading shared objects from the
1073 "tls" subdirectories on the library search path, the subdirectory that
1074 corresponds to the AT_PLATFORM system name, and also stop employing
1075 the legacy AT_HWCAP search mechanism. Applications should switch to
1076 the new glibc-hwcaps mechanism instead; if they do not do that, only
1077 the baseline version (directly from the search path directory) will be
1080 Changes to build and runtime requirements:
1082 * On Linux, the system administrator needs to configure /dev/pts with
1083 the intended access modes for pseudo-terminals. glibc no longer
1084 attemps to adjust permissions of terminal devices. The previous glibc
1085 defaults ("tty" group, user read/write and group write) already
1086 corresponded to what most systems used, so that grantpt did not
1087 perform any adjustments.
1089 * On Linux, the posix_openpt and getpt functions no longer attempt to
1090 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1091 (and pseudo-terminals are supported), a devpts file system is mounted
1092 on /dev/pts. Current systems already meet these requirements.
1094 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1096 Security related changes:
1098 CVE-2021-3326: An assertion failure during conversion from the
1099 ISO-20220-JP-3 character set using the iconv function has been fixed.
1100 This assertion was triggered by certain valid inputs in which the
1101 converted output contains a combined sequence of two wide characters
1102 crossing a buffer boundary. Reported by Tavis Ormandy.
1104 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1105 invoked with input containing redundant shift sequences in the IBM1364,
1106 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1108 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1109 when invoked with UCS4 input containing an invalid character.
1111 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1112 invoked with EUC-KR input containing invalid multibyte input sequences.
1114 The following bugs are resolved with this release:
1116 [10635] libc: realpath portability patches
1117 [16124] dynamic-link: ld.so should allow to change argv[0]
1118 [17924] malloc: 'free' should not set errno
1119 [18683] libc: Linux faccessat implementation can incorrectly ignore
1121 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1122 [23091] hurd: missing waitid support
1123 [23249] libc: Epyc and other current AMD CPUs do not select the
1124 "haswell" platform subdirectory
1125 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1127 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1129 [24941] libc: Make grantpt usable after multi-threaded fork in more
1131 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1132 [24973] locale: iconv encounters segmentation fault when converting
1133 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1134 [25399] string: undefined reference to `__warn_memset_zero_len' when
1135 changing gnuc version
1136 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1138 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1140 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1141 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1142 [26100] libc: Race in syslog(3) with regards to tag printing.
1143 [26124] libc: Export <cpu-features.h>
1144 [26130] nscd: Inconsistent nscd cache during pruning
1145 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1146 [26224] locale: iconv hangs when converting some invalid inputs from
1147 several IBM character sets (CVE-2020-27618)
1148 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1149 too much stack space
1150 [26343] manual: invalid documented return type for strerrorname_np(),
1151 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1152 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1154 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1156 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1157 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1159 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1160 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1161 [26555] string: strerrorname_np does not return the documented value
1162 [26592] libc: pointer arithmetic overflows in realpath
1163 [26600] network: Transaction ID collisions cause slow DNS lookups in
1165 [26606] libc: [2.33 Regression] pselect is broken on x32
1166 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1167 [26620] glob: fnmatch with collating symbols results in segmentation
1169 [26625] libc: [2.33 Regression] CET is disabled
1170 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1171 at the end of a memory mapping
1172 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1173 by the caller to the kernel
1174 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1175 [26647] build: [-Werror=array-parameter=] due to different
1176 declarations for __sigsetjmp
1177 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1179 [26649] stdio: printf should handle non-normal x86 long double numbers
1180 gracefully (CVE-2020-29573)
1181 [26686] build: -Warray-parameter instances building with GCC 11
1182 [26687] build: -Warray-bounds instances building with GCC 11
1183 [26690] stdio: Aliasing violation in __vfscanf_internal
1184 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1185 [26726] build: GCC warning calling new_composite_name with an array of
1187 [26736] libc: FAIL: misc/tst-sysvshm-linux
1188 [26737] libc: Random FAIL: rt/tst-shm
1189 [26791] libc: Missing O_CLOEXEC in sysconf.c
1190 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1192 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1194 [26818] string: aarch64: string tests may run ifunc variants that are
1196 [26821] libc: Memory leak test failures on Fedora 33
1197 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1198 FSGSBASE/LM/RDRAND check failure
1199 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1201 [26853] libc: aarch64: Missing unwind information in statically linked
1203 [26923] locale: Assertion failure in iconv when converting invalid
1204 UCS4 (CVE-2020-29562)
1205 [26926] dynamic-link: aarch64: library dependencies are not bti
1207 [26932] libc: sh: Multiple floating point functions defined as stubs
1209 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1211 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1213 [27002] build: libc_freeres_fn build failure with GCC 11
1214 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1215 [27008] dynamic-link: ld.so.cache should have endianness markup
1216 [27042] libc: [alpha] anonymous union in struct stat confuses
1218 [27053] libc: Conformance regression in system(3) (and probably also
1220 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1222 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1223 [27083] libc: Unsafe unbounded alloca in addmntent
1224 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1226 [27130] string: "rep movsb" performance issue
1227 [27150] libc: alpha: wait4() is unavailable in static linking
1228 [27177] dynamic-link:
1229 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1231 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1232 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1233 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1234 related to combining characters (CVE-2021-3326)
1241 * Unicode 13.0.0 Support: Character encoding, character type info, and
1242 transliteration tables are all updated to Unicode 13.0.0, using
1243 generator scripts contributed by Mike FABIAN (Red Hat).
1245 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1247 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1248 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1249 Three ABIs are supported:
1255 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1256 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1258 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1259 DT_DEPAUDIT dynamic section entries of the main executable.
1261 * powerpc64le supports IEEE128 long double libm/libc redirects when
1262 using -mabi=ieeelongdouble to compile C code on supported GCC
1263 toolchains. It is recommended to use GCC 8 or newer when testing
1266 * To help detect buffer overflows and other out-of-bounds accesses
1267 several APIs have been annotated with GCC 'access' attribute. This
1268 should help GCC 10 issue better warnings.
1270 * On Linux, functions pthread_attr_setsigmask_np and
1271 pthread_attr_getsigmask_np have been added. They allow applications
1272 to specify the signal mask of a thread created with pthread_create.
1274 * The GNU C Library now provides the header file <sys/single_threaded.h>
1275 which declares the variable __libc_single_threaded. Applications are
1276 encouraged to use this variable for single-thread optimizations,
1277 instead of weak references to symbols historically defined in
1280 * The functions sigabbrev_np and sigdescr_np have been added. The
1281 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1282 SIGHUP) while sigdescr_np returns a string describing the signal number
1283 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1284 attempt to translate the return description, both functions return
1285 NULL for an invalid signal number.
1287 They should be used instead of sys_siglist or sys_sigabbrev and they
1288 are both thread and async-signal safe. These functions are GNU extensions.
1290 * The functions strerrorname_np and strerrordesc_np have been added. The
1291 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1292 while strerrordesc_np returns a string describing the error number
1293 (e.g "Invalid argument" for EINVAL). Different than strerror,
1294 strerrordesc_np does not attempt to translate the return description, both
1295 functions return NULL for an invalid error number.
1297 They should be used instead of sys_errlist and sys_nerr, both are
1298 thread and async-signal safe. These functions are GNU extensions.
1300 * AArch64 now supports standard branch protection security hardening
1301 in glibc when it is built with a GCC that is configured with
1302 --enable-standard-branch-protection (or if -mbranch-protection=standard
1303 flag is passed when building both GCC target libraries and glibc,
1304 in either case a custom GCC is needed). This includes branch target
1305 identification (BTI) and pointer authentication for return addresses
1306 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1307 extensions respectively for the protection to be effective,
1308 otherwise the used instructions are nops. User code can use PAC-RET
1309 without libc support, but BTI requires a libc that is built with BTI
1310 support, otherwise runtime objects linked into user code will not be
1313 Deprecated and removed features, and other changes affecting compatibility:
1315 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1316 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1317 RPC header files. Backward compatibility for old programs is kept
1318 only for architectures and ABIs that have been added in or before
1319 glibc 2.31. New programs need to use TI-RPC
1320 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1321 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1323 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1324 as shared library for backward compatibility and the NSS modules "nis"
1325 and "nisplus" are not built at all and libnsl's headers aren't
1326 installed. This compatibility is kept only for architectures and ABIs
1327 that have been added in or before version 2.28. Replacement
1328 implementations based on TI-RPC, which additionally support IPv6, are
1329 available from <https://github.com/thkukuk/>. This change does not
1330 affect the "compat" NSS module, which does not depend on libnsl
1331 since 2.27 and thus can be used without NIS.
1333 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1334 removed. To support old binaries, the sysctl function continues to
1335 exist as a compatibility symbol (on those architectures which had it),
1336 but always fails with ENOSYS. This reflects the removal of the system
1337 call from all architectures, starting with Linux 5.5.
1339 * The sstk function is no longer available to newly linked binaries.
1340 Its implementation always returned with a failure, and the function
1341 was not declared in any header file.
1343 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1344 sigrelse, sigignore and sigset, and the sigmask macro have been
1345 deprecated. Applications should use the sigsuspend, sigprocmask and
1346 sigaction functions instead.
1348 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1349 already supported this format for almost 20 years.
1351 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1352 are no longer available to newly linked binaries, and their declarations
1353 have been removed from <string.h>. They are exported solely as
1354 compatibility symbols to support old binaries. All programs should use
1357 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1358 are no longer available to newly linked binaries, and their declarations
1359 have been removed from <stdio.h>. They are exported solely as
1360 compatibility symbols to support old binaries. All programs should use
1361 strerror or strerror_r instead.
1363 * Both strerror and strerror_l now share the same internal buffer in the
1364 calling thread, meaning that the returned string pointer may be invalided
1365 or contents might be overwritten on subsequent calls in the same thread or
1366 if the thread is terminated. It makes strerror MT-safe.
1368 * Using weak references to libpthread functions such as pthread_create
1369 or pthread_key_create to detect the singled-threaded nature of a
1370 program is an obsolescent feature. Future versions of glibc will
1371 define pthread_create within libc.so.6 itself, so such checks will
1372 always flag the program as multi-threaded. Applications should check
1373 the __libc_single_threaded variable declared in
1374 <sys/single_threaded.h> instead.
1376 * The "files" NSS module no longer supports the "key" database (used for
1377 secure RPC). The contents of the /etc/publickey file will be ignored,
1378 regardless of the settings in /etc/nsswitch.conf. (This method of
1379 storing RPC keys only supported the obsolete and insecure AUTH_DES
1380 flavor of secure RPC.)
1382 * The __morecore and __after_morecore_hook malloc hooks and the default
1383 implementation __default_morecore have been deprecated. Applications
1384 should use malloc interposition to change malloc behavior, and mmap to
1385 allocate anonymous memory. A future version of glibc may require that
1386 applications which use the malloc hooks must preload a special shared
1387 object, to enable the hooks.
1389 * The hesiod NSS module has been deprecated and will be removed in a
1390 future version of glibc. System administrators are encouraged to
1391 switch to other approaches for networked account databases, such as
1394 Changes to build and runtime requirements:
1396 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1397 long double redirects.
1399 Security related changes:
1401 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1402 invoked with the -c option and when processing invalid multi-byte input
1403 sequences. Reported by Jan Engelhardt.
1405 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1406 corruption when they were passed a pseudo-zero argument. Reported by Guido
1407 Vranken / ForAllSecure Mayhem.
1409 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1410 expanding ~user has been fixed.
1412 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1413 memmove functions has been fixed. Discovered by Jason Royes and Samual
1414 Dytrych of the Cisco Security Assessment and Penetration Team (See
1417 The following bugs are resolved with this release:
1419 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1420 [10441] manual: Backtraces code example lacks error checking
1421 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1422 timer_sigev_thread dangerous
1423 [14231] stdio: stdio-common tests memory requirements
1424 [14578] libc: /proc-based emulation for lchmod, fchmodat
1425 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1426 filtee has constructor
1427 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1428 sequences (CVE-2016-10228)
1429 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1430 character entities for infinity & pi
1431 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1432 segfaults in applications
1433 [20543] libc: Please move from .gnu.linkonce to comdat
1434 [22489] network: gcc warns about implicit convertion in
1435 ICMP6_FILTER_SETPASS with -Wsign-conversion
1436 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1437 [23294] math: Complex _FloatN functions are redirected to the wrong
1438 function with -mlong-double-64
1439 [23296] libc: Data race in setting function descriptor during lazy
1441 [23668] dynamic-link: ldconfig: Default to the new format for
1443 [23819] hurd: hurd: Add C11 thread support
1444 [23990] build: test-container error out on failure to exec child.
1445 [23991] build: shell-container typo in run_command_array
1446 [24638] manual: Error in example of parsing a template string
1447 [24654] manual: Wrong declaration of wcschr in libc manual
1448 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1450 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1451 dynamically loaded dsos
1452 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1453 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1455 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1456 restore EAX, ECX and EDX
1457 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1458 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1459 [25420] network: Race condition in resolv_conf.c can result in caching
1460 stale configuration forever
1461 [25487] math: sinl() stack corruption from crafted input
1463 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1465 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1466 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1468 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1469 on 32 bit and old kernel
1470 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1471 [25639] localedata: Some names of days and months wrongly spelt in
1473 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1474 amount of sigset_t bytes
1475 [25691] stdio: printf: memory leak when printing long multibyte
1477 [25715] libc: system() returns wrong errors when posix_spawn fails
1478 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1479 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1480 state for conversions that produce two Unicode code points
1481 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1482 for linux x86_64 leads to livelock
1483 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1484 test failures, invalid instruction in ld.so
1485 [25790] glob: Typo in tst-fnmatch.input
1486 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1488 [25819] localedata: Update locale data to Unicode 13.0.0
1489 [25824] libc: Abnormal function of strnlen in aarch64
1490 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1491 [25896] libc: Incorrect prctl
1492 [25902] libc: Bad LOADARGS_N
1493 [25905] dynamic-link: VSX registers are corrupted during PLT
1494 resolution when glibc is built with --disable-multi-arch and --with-
1496 [25933] string: Off by one error in __strncmp_avx2 when
1497 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1499 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1500 exiting detached thread
1501 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1503 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1505 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1506 [26073] math: getpayload() has wrong return value
1507 [26076] dynamic-link: dlmopen crashes after failing to load
1508 dependencies in audit mode
1509 [26120] localedata: column width of of some Korean
1510 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1511 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1512 [26133] libc: Incorrect need_arch_feature_F16C
1513 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1515 [26149] libc: PKU is usable only if OSPKE is set
1516 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1518 [26208] libc: Incorrect bit_cpu_CLFSH
1519 [26210] network: Incorrect use of hidden symbols for global sunrpc
1521 [26211] stdio: printf integer overflow calculating allocation size
1522 [26214] stdio: printf_fp double free
1523 [26215] stdio: printf_fp memory leak
1524 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1525 [26258] nss: nss_compat should not read input files with mmap
1526 [26332] string: Incorrect cache line size load causes memory
1527 corruption in memset
1534 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1535 enable features from the draft ISO C2X standard. Only some features from
1536 this draft standard are supported by the GNU C Library, and as the draft
1537 is under active development, the set of features enabled by this macro is
1538 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1539 by compiling with "gcc -std=gnu2x".
1541 * The <math.h> functions that round their results to a narrower type now
1542 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1543 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1544 Clarification Request 13 to TS 18661-3.
1546 * The function pthread_clockjoin_np has been added, enabling join with a
1547 terminated thread with a specific clock. It allows waiting against
1548 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1550 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1552 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1553 in queries if the trust-ad option is set via the options directive in
1554 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1555 mode, the AD bit, as provided by the name server, is available to
1556 applications which call res_search and related functions. In the default
1557 mode, the AD bit is not set in queries, and it is automatically cleared in
1558 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1559 servers and the network path to them are treated as untrusted.)
1561 Deprecated and removed features, and other changes affecting compatibility:
1563 * The totalorder and totalordermag functions, and the corresponding
1564 functions for other floating-point types, now take pointer arguments to
1565 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1566 passing. This is in accordance with the resolution of Clarification
1567 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1568 floating-point arguments directly will continue to work.
1570 * The obsolete function stime is no longer available to newly linked
1571 binaries, and its declaration has been removed from <time.h>.
1572 Programs that set the system time should use clock_settime instead.
1574 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1575 in a future version of glibc. In this release, the header still exists
1576 but calling ftime will cause a compiler warning. All programs should use
1577 gettimeofday or clock_gettime instead.
1579 * The gettimeofday function no longer reports information about a
1580 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1581 many years, as it cannot handle the full complexity of the world's
1582 timezones, but hitherto we have supported it on a best-effort basis.
1583 Changes required to support 64-bit time_t on 32-bit architectures have
1584 made this no longer practical.
1586 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1587 should expect to receive a 'struct timezone' whose tz_minuteswest and
1588 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1589 happen on a few Linux-based ports. This will be corrected in a future
1592 All callers should supply a null pointer for the 'tzp' argument to
1593 gettimeofday. For accurate information about the time zone associated
1594 with the current time, use the localtime function.
1596 gettimeofday itself is obsolescent according to POSIX. We have no plans
1597 to remove access to this function, but portable programs should consider
1598 using clock_gettime instead.
1600 * The settimeofday function can still be used to set a system-wide time
1601 zone when the operating system supports it. This is because the Linux
1602 kernel reused the API, on some architectures, to describe a system-wide
1603 time-zone-like offset between the software clock maintained by the kernel,
1604 and the "RTC" clock that keeps time when the system is shut down.
1606 However, to reduce the odds of this offset being set by accident,
1607 settimeofday can no longer be used to set the time and the offset
1608 simultaneously. If both of its two arguments are non-null, the call
1609 will fail (setting errno to EINVAL).
1611 Callers attempting to set this offset should also be prepared for the call
1612 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1613 some Linux architectures. The Linux kernel maintainers are discussing a
1614 more principled replacement for the reused API. After a replacement
1615 becomes available, we will change settimeofday to fail with ENOSYS on all
1616 platforms when its 'tzp' argument is not a null pointer.
1618 settimeofday itself is obsolescent according to POSIX. Programs that set
1619 the system time should use clock_settime and/or the adjtime family of
1620 functions instead. We may cease to make settimeofday available to newly
1621 linked binaries after there is a replacement for Linux's time-zone-like
1624 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1625 the optional CAS instruction is implemented (for instance, LEON processors
1626 are still supported, but SuperSPARC processors are not).
1628 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1631 * If a lazy binding failure happens during dlopen, during the execution of
1632 an ELF constructor, the process is now terminated. Previously, the
1633 dynamic loader would return NULL from dlopen, with the lazy binding error
1634 captured in a dlerror message. In general, this is unsafe because
1635 resetting the stack in an arbitrary function call is not possible.
1637 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1638 executable stack unless explicitly configured at build time to require
1639 minimum kernel version 4.8 or newer. This is because executing
1640 floating-point branches on a non-executable stack on Linux kernels prior to
1641 4.8 can lead to application crashes for some MIPS configurations. While
1642 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1643 expected to enable non-executable stack by default with PT_GNU_STACK by
1644 default and is thus likely to trigger a crash on older kernels.
1646 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1647 non-executable stack while dropping support for older kernels.
1649 * System call wrappers for time system calls now use the new time64 system
1650 calls when available. On 32-bit targets, these wrappers attempt to call
1651 the new system calls first and fall back to the older 32-bit time system
1652 calls if they are not present. This may cause issues in environments
1653 that cannot handle unsupported system calls gracefully by returning
1654 -ENOSYS. Seccomp sandboxes are affected by this issue.
1656 Changes to build and runtime requirements:
1658 * It is no longer necessary to have recent Linux kernel headers to build
1659 working (non-stub) system call wrappers on all architectures except 64-bit
1660 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1662 * The ChangeLog file is no longer present in the toplevel directory of the
1663 source tree. ChangeLog files are located in the ChangeLog.old directory as
1664 ChangeLog.N where the highest N has the latest entries.
1666 Security related changes:
1668 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1669 out-of-bounds write when executed in a signal frame context.
1671 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1672 environment variable during program execution after a security
1673 transition, allowing local attackers to restrict the possible mapping
1674 addresses for loaded libraries and thus bypass ASLR for a setuid
1675 program. Reported by Marcin Kościelnicki.
1677 The following bugs are resolved with this release:
1679 [12031] localedata: iconv -t ascii//translit with Greek characters
1680 [15813] libc: Multiple issues in __gen_tempname
1681 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1682 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1683 [19767] libc: vdso is not used with static linking
1684 [19903] hurd: Shared mappings not being inherited by children processes
1685 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1686 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1688 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1689 Symbols-A/B Unicode blocks
1690 [23518] libc: Eliminate __libc_utmp_jump_table
1691 [24026] malloc: malloc_info() returns wrong numbers
1692 [24054] localedata: Many locales are missing date_fmt
1693 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1694 [24304] dynamic-link: Lazy binding failure during ELF
1695 constructors/destructors is not fatal
1696 [24376] libc: RISC-V symbol size confusion with _start
1697 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1699 [24824] libc: test-in-container does not install charmap files compatible
1701 [24844] regex: regex bad pointer / leakage if malloc fails
1702 [24867] malloc: Unintended malloc_info formatting changes
1703 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1704 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1705 [24882] libc: login: pututline uses potentially outdated cache
1706 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1707 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1709 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1711 [24930] dynamic-link: dlopen of PIE executable can result in
1712 _dl_allocate_tls_init assertion failure
1713 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1714 (stringop-overflow error)
1715 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1716 functions other can lead to crashes
1717 [24967] libc: jemalloc static linking causes runtime failure
1718 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1720 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1721 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1722 [25097] libc: new -Warray-bounds with GCC 10
1723 [25112] dynamic-link: dlopen must not make new objects accessible when it
1724 still can fail with an error
1725 [25139] localedata: Please add the new mnw_MM locale
1726 [25149] regex: Array bounds violation in proceed_next_node
1727 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1728 initialized correctly
1729 [25189] libc: glibc's __glibc_has_include causes issues with clang
1731 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1732 value to an unsigned
1733 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1734 binaries (CVE-2019-19126)
1735 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1737 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1739 [25232] string: <string.h> does not enable const correctness for strchr et
1741 [25233] localedata: Consider "." as the thousands separator for sl_SI
1743 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1744 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1745 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1747 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1748 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1750 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1751 (dl_initfirst) link map pointer
1752 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1753 [25423] libc: Array overflow in backtrace on powerpc
1754 [25425] network: Missing call to __resolv_context_put in
1755 getaddrinfo.c:gethosts
1762 * Unicode 12.1.0 Support: Character encoding, character type info, and
1763 transliteration tables are all updated to Unicode 12.1.0, using
1764 generator scripts contributed by Mike FABIAN (Red Hat).
1766 * The dynamic linker accepts the --preload argument to preload shared
1767 objects, in addition to the LD_PRELOAD environment variable.
1769 * The twalk_r function has been added. It is similar to the existing
1770 twalk function, but it passes an additional caller-supplied argument
1771 to the callback function.
1773 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1775 * Minguo (Republic of China) calendar support has been added as an
1776 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1779 * The entry for the new Japanese era has been added for ja_JP locale.
1781 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1782 pvalloc, memalign, and posix_memalign fail now with total object size
1783 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1784 pointer subtraction within the allocated object, where results might
1785 overflow the ptrdiff_t type.
1787 * The dynamic linker no longer refuses to load objects which reference
1788 versioned symbols whose implementation has moved to a different soname
1789 since the object has been linked. The old error message, symbol
1790 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1791 link time reference, is gone.
1793 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1794 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1795 functions. These behave similarly to their "timed" equivalents, but also
1796 accept a clockid_t parameter to determine which clock their timeout should
1797 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1798 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1799 time of the wait (unlike with pthread_condattr_setclock, which requires
1800 the clock choice at initialization time).
1802 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1803 work, new resolvers can use a second argument which can be extended in
1804 the future, currently it contains the AT_HWCAP2 value.
1806 Deprecated and removed features, and other changes affecting compatibility:
1808 * The copy_file_range function fails with ENOSYS if the kernel does not
1809 support the system call of the same name. Previously, user space
1810 emulation was performed, but its behavior did not match the kernel
1811 behavior, which was deemed too confusing. Applications which use the
1812 copy_file_range function can no longer rely on glibc to provide a fallback
1813 on kernels that do not support the copy_file_range system call, and if
1814 this function returns ENOSYS, they will need to use their own fallback.
1815 Support for copy_file_range for most architectures was added in version
1816 4.5 of the mainline Linux kernel.
1818 * The functions clock_gettime, clock_getres, clock_settime,
1819 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1820 for new applications (on architectures which had them). Instead, the
1821 definitions in libc will be used automatically, which have been available
1824 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1825 and <sys/stropts.h> have been removed.
1827 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1828 resolver flag (deprecated in glibc 2.25) have been removed.
1830 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1831 resolver have been removed from <resolv.h>.
1833 * With --enable-bind-now, installed programs are now linked with the
1836 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1837 configurations) has been removed, following the deprecation of this
1838 subarchitecture in version 8 of GCC, and its removal in version 9.
1840 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1841 header have been removed.
1843 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1844 deprecated and will be removed from a future version of glibc.
1845 Application should directly access /proc instead. For obtaining random
1846 bits, the getentropy function can be used.
1848 Changes to build and runtime requirements:
1850 * GCC 6.2 or later is required to build the GNU C Library.
1852 Older GCC versions and non-GNU compilers are still supported when
1853 compiling programs that use the GNU C Library.
1855 Security related changes:
1857 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1858 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1859 has undefined behavior. On x32, the size_t argument may be passed
1860 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1861 32 bits. When it happened with the sign bit of RDX register set,
1862 memcmp gave the wrong result since it treated the size argument as
1863 zero. Reported by H.J. Lu.
1865 CVE-2019-9169: Attempted case-insensitive regular-expression match
1866 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1867 over-read. Reported by Hongxu Chen.
1869 The following bugs are resolved with this release:
1871 [2872] locale: Transliteration Cyrillic -> ASCII fails
1872 [6399] libc: gettid() should have a wrapper
1873 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1874 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1875 [17396] localedata: globbing for locale by [[.collating-element.]]
1876 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1877 [18465] malloc: memusagestat is built using system C library
1878 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1879 invalid input drops valid char
1880 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1881 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1882 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1883 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1884 [23352] malloc: __malloc_check_init still defined in public header
1886 [23403] nptl: Wrong alignment of TLS variables
1887 [23501] libc: nftw() doesn't return dangling symlink's inode
1888 [23733] malloc: Check the count before calling tcache_get()
1889 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1891 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1892 [23844] nptl: pthread_rwlock_trywrlock results in hang
1893 [23983] argparse: Missing compat versions of argp_failure and argp_error
1894 for long double = double
1895 [23984] libc: Missing compat versions of err.h and error.h functions for
1896 long double = double
1897 [23996] localedata: Dutch salutations
1898 [24040] libc: riscv64: unterminated call chain in __thread_start
1899 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1901 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1902 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1904 [24114] regex: regexec buffer read overrun in "grep -i
1905 '\(\(\)*.\)*\(\)\(\)\1'"
1906 [24122] libc: Segfaults if 0 returned from la_version
1907 [24153] stdio: Some input functions do not react to stdin assignment
1908 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1909 RDX is set) (CVE-2019-7309)
1910 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1911 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1912 not the default "nor"
1913 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1914 false positives, change to modern flexible array
1915 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1916 instructions while maintaining the robust mutex list due to missing
1918 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1919 unnecessary librt dependencies
1920 [24200] localedata: Revert first_weekday removal in en_IE locale
1921 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1922 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1923 [24216] malloc: Check for large bin list corruption when inserting
1925 [24228] stdio: old x86 applications that use legacy libio crash on exit
1926 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1928 [24293] localedata: Missing Minguo calendar support for TW locales
1929 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1930 tt_RU (Tatar) locale
1931 [24307] localedata: Update locale data to Unicode 12.0.0
1932 [24323] dynamic-link: dlopen should not be able open PIE objects
1933 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1934 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1935 tt_RU (Tatar) locale
1936 [24370] localedata: Add lang_name for tt_RU locale
1937 [24372] locale: Binary locale files are not architecture independent
1938 [24394] time: strptime %Ey mis-parses final year of era
1939 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1941 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1943 [24531] malloc: Malloc tunables give tcache assertion failures
1944 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1946 [24535] localedata: Update locale data to Unicode 12.1.0
1947 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1948 kernels and break testing
1949 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1950 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1951 [-Werror=format-overflow=]
1952 [24570] libc: alpha: compat msgctl uses __IPC_64
1953 [24584] locale: Data race in __wcsmbs_clone_conv
1954 [24588] stdio: Remove codecvt vtables from libio
1955 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1957 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1958 [24632] stdio: Old binaries which use freopen with default stdio handles
1960 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1962 [24652] localedata: szl_PL spelling correction
1963 [24695] nss: nss_db: calling getpwent after endpwent crashes
1964 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1965 in /etc/nsswitch.conf
1966 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1967 [24740] libc: getdents64 type confusion
1968 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1969 always implemented in the same library
1970 [24744] libc: Remove copy_file_range emulation
1971 [24757] malloc: memusagestat is linked against system libpthread
1972 [24794] libc: Partial test suite run builds corrupt test-in-container
1980 * The getcpu wrapper function has been added, which returns the currently
1981 used CPU and NUMA node. This function is Linux-specific.
1983 * A new convenience target has been added for distribution maintainers
1984 to build and install all locales as directories with files. The new
1985 target is run by issuing the following command in your build tree:
1986 'make localedata/install-locale-files', with an optional DESTDIR
1987 to set the install root if you wish to install into a non-default
1988 configured location.
1990 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1992 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1993 for _GNU_SOURCE, to match BSD environments.
1995 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1996 indicates that it will abort the transaction prior to entering the kernel
1997 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1998 suspended, and this caused some undefined side-effects issues by aborting
1999 transactions manually. Glibc avoided it by abort transactions manually on
2000 each syscall, but it lead to performance issues on newer kernels where the
2001 HTM state is saved and restore lazily (the state being saved even when the
2002 process actually does not use HTM).
2004 * The functions posix_spawn_file_actions_addchdir_np and
2005 posix_spawn_file_actions_addfchdir_np have been added, enabling
2006 posix_spawn and posix_spawnp to run the new process in a different
2007 directory. These functions are GNU extensions. The function
2008 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2011 * The popen and system do not run atfork handlers anymore (BZ#17490).
2012 Although it is a possible POSIX violation, the POSIX rationale in
2013 pthread_atfork documentation regarding atfork handlers is to handle
2014 inconsistent mutex state after a fork call in a multi-threaded process.
2015 In both popen and system there is no direct access to user-defined mutexes.
2017 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2018 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2020 - C-SKY ABIV2 soft-float little-endian
2021 - C-SKY ABIV2 hard-float little-endian
2023 * strftime's default formatting of a locale's alternative year (%Ey)
2024 has been changed to zero-pad the year to a minimum of two digits,
2025 like "%y". This improves the display of Japanese era years during
2026 the first nine years of a new era, and is expected to be harmless
2027 for all other locales (only Japanese locales regularly have
2028 alternative year numbers less than 10). Zero-padding can be
2029 overridden with the '_' or '-' flags (which are GNU extensions).
2031 * As a GNU extension, the '_' and '-' flags can now be applied to
2032 "%EY" to control how the year number is formatted; they have the
2033 same effect that they would on "%Ey".
2035 Deprecated and removed features, and other changes affecting compatibility:
2037 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2038 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2040 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2041 in <sys/procfs.h>, has been corrected to match the type actually used by
2042 the Linux kernel. This affects the size and layout of that structure on
2043 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2045 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2046 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2047 defined in <sys/procfs.h>, has been corrected to match the type actually
2048 used by the Linux kernel. This affects the size and layout of those
2051 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2052 meant to scan a string and allocate space for it with malloc, is now
2053 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2054 defined. This extension conflicts with C99's use of '%a' to scan a
2055 hexadecimal floating-point number, which is now available to programs
2056 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2058 POSIX.1-2008 includes the feature of allocating a buffer for string input
2059 with malloc, using the modifier letter 'm' instead. Programs using
2060 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2061 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2062 C99 '%a' no longer need to avoid _GNU_SOURCE.
2064 GCC's -Wformat warnings can detect most uses of this extension, as long
2065 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2066 __attribute__ ((format (scanf, ...))).
2068 Changes to build and runtime requirements:
2070 * Python 3.4 or later is required to build the GNU C Library.
2072 * On most architectures, GCC 5 or later is required to build the GNU C
2073 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2075 Older GCC versions and non-GNU compilers are still supported when
2076 compiling programs that use the GNU C Library.
2078 Security related changes:
2080 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2081 denial of service due to resource exhaustion when processing getaddrinfo
2082 calls with crafted host names. Reported by Guido Vranken.
2084 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2085 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2086 happened, accessing the 32-bit size_t value as the full 64-bit register
2087 in the assembly string/memory functions would cause a buffer overflow.
2088 Reported by H.J. Lu.
2090 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2091 addresses with arbitrary trailing characters, potentially leading to data
2092 or command injection issues in applications.
2094 The following bugs are resolved with this release:
2096 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2097 [10496] localedata: 12h time representation in multiple locales faulty
2098 [10797] localedata: it_IT locale numeric does not have a separator for
2100 [11319] libc: dprintf doesn't handle errors properly
2101 [16346] time: mktime: potentially unsafe use of localtime_offset
2102 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2104 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2105 posix_spawn_file_actions_addfchdir_np
2106 [17426] localedata: Indian locales: set the correct date format
2107 [17490] stdio: popen should not invoke atfork handlers
2108 [17783] libc: TIOCSER_TEMT conditions inconsistent
2109 [18040] regex: use-after-free in regexec/get_subexp
2110 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2111 [20018] network: getaddrinfo should reject IP addresses with trailing
2112 characters (CVE-2016-10739)
2113 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2114 [20271] libc: Missing "\n" in __libc_fatal calls
2115 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2116 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2117 pointer argument is non-NULL
2118 [21037] stdio: open_memstream and freopen
2119 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2120 [21716] time: Crash in glibc's mktime in low-memory situations
2121 [22834] stdio: Subprocess forked by popen may crash in Linux when
2122 multithreads call popen
2123 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2124 and pthread_create fails.
2125 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2126 [23125] libc: riscv64: endless loop when throwing an exception from a
2128 [23275] nptl: Race in pthread_mutex_lock while promoting to
2129 PTHREAD_MUTEX_ELISION_NP.
2130 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2132 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2134 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2136 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2137 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2139 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2140 [23521] nss: get_next_alias nss_files file stream leak
2141 [23538] nptl: Hang in pthread_cond_broadcast
2142 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2143 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2144 [23579] libc: Errors misreported in preadv2
2145 [23597] build: support/test-container.c doesn't work with different
2147 [23603] time: mktime signed integer overflow on large timestamps
2148 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2149 [23614] libc: powerpc: missing CFI register information in __mpn_*
2151 [23637] string: Generic strstr/strcasestr fails with huge needles
2152 [23640] libc: no way to easily clear FD_CLOEXEC in
2153 posix_spawn_file_actions_adddup2()
2154 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2156 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2158 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2159 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2160 bits/types/struct_rusage.h
2161 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2163 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2165 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2166 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2167 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2169 [23724] localedata: Albanian date formats are incorrect
2170 [23735] math: libnldbl_nonshared.a references internal libm symbols
2171 [23740] localedata: kl_GL: Month names and date formats need update
2172 [23744] regex: regex refactorings to remove BE, avoid duplication
2173 [23745] time: mktime fix for Gnulib + coreutils
2174 [23758] time: Improve the width of alternate representation for year in
2176 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2177 [23789] time: mktime does not set errno on failure
2178 [23791] localedata: Wrong monetary format for ca_ES locale
2179 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2180 [23794] locale: c16rtomb does not handle surrogate pairs
2181 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2182 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2183 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2184 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2185 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2186 [23862] libc: [sh] missing kernel-features.h undefines
2187 [23864] libc: [riscv] missing kernel-features.h undefines
2188 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2189 [23907] malloc: Incorrect double-free malloc tcache check disregards
2191 [23913] libc: off-by-one in function maybe_script_execute in
2192 sysdeps/posix/spawni.c
2193 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2194 [23923] locale: Add --no-hard-links option to localedef
2195 [23927] network: Linux if_nametoindex() does not close descriptor
2197 [23961] math: powf can overflow to inf without setting errno in non-
2198 nearest rounding mode
2199 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2200 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2201 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2202 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2203 [24011] localedata: Fixed small type in comment for locale bs_BA
2204 [24018] libc: gettext() may return NULL
2205 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2206 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2207 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2209 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2210 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2212 [24046] localedata: en_US locale doesn't define date_fmt
2213 [24063] manual: @var{errno} should be @code{errno}
2214 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2215 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2217 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2219 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2221 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2223 [24112] network: Do not send DNS queries for non-host names (where all
2224 answers will be rejected)
2225 [24130] libc: alpha __remqu corrupts $f3 register
2232 * The localization data for ISO 14651 is updated to match the 2016
2233 Edition 4 release of the standard, this matches data provided by
2234 Unicode 9.0.0. This update introduces significant improvements to the
2235 collation of Unicode characters. This release deviates slightly from
2236 the standard in that the collation element ordering for lowercase and
2237 uppercase LATIN script characters is adjusted to ensure that regular
2238 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2239 is not matched by [a-z]. With the update many locales have been
2240 updated to take advantage of the new collation information. The new
2241 collation information has increased the size of the compiled locale
2242 archive or binary locales.
2244 * The GNU C Library can now be compiled with support for Intel CET, AKA
2245 Intel Control-flow Enforcement Technology. When the library is built
2246 with --enable-cet, the resulting glibc is protected with indirect
2247 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2248 compatible with all existing executables and shared libraries. This
2249 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2250 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2251 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2252 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2253 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2254 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2257 * The GNU C Library now has correct support for ABSOLUTE symbols
2258 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2259 relocated incorrectly or in some cases discarded. The GNU linker can
2260 make use of the newer semantics, but it must communicate it to the
2261 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2262 field) to indicate such support is required.
2264 * Unicode 11.0.0 Support: Character encoding, character type info, and
2265 transliteration tables are all updated to Unicode 11.0.0, using
2266 generator scripts contributed by Mike FABIAN (Red Hat).
2268 * <math.h> functions that round their results to a narrower type are added
2269 from TS 18661-1:2014 and TS 18661-3:2015:
2271 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2272 fMxaddfNx functions.
2274 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2275 fMxsubfNx functions.
2277 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2278 fMxmulfNx functions.
2280 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2281 fMxdivfNx functions.
2283 * Two grammatical forms of month names are now supported for the following
2284 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2285 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2286 support two grammatical forms in abbreviated month names: Catalan, Greek,
2289 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2290 include the support for two grammatical forms of month names.
2292 * Building and running on GNU/Hurd systems now works without out-of-tree
2295 * The renameat2 function has been added, a variant of the renameat function
2296 which has a flags argument. If the flags are zero, the renameat2 function
2297 acts like renameat. If the flag is not zero and there is no kernel
2298 support for renameat2, the function will fail with an errno value of
2299 EINVAL. This is different from the existing gnulib function renameatu,
2300 which performs a plain rename operation in case of a RENAME_NOREPLACE
2301 flags and a non-existing destination (and therefore has a race condition
2302 that can clobber the destination inadvertently).
2304 * The statx function has been added, a variant of the fstatat64
2305 function with an additional flags argument. If there is no direct
2306 kernel support for statx, glibc provides basic stat support based on
2307 the fstatat64 function.
2309 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2310 library if installed. libidn2 version 2.0.5 or later is recommended. If
2311 libidn2 is not available, internationalized domain names are not encoded
2312 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2313 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2314 with an encoding error.) Flags which used to change the IDN encoding and
2315 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2316 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2317 deprecated. They no longer have any effect.
2319 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2320 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2321 range of ELF gABI expressions including such constructs as
2322 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2323 have been further restricted, and where in the past a dynamic string
2324 token sequence may have been interpreted as a literal string it will
2325 now cause a load failure. These load failures were always considered
2326 unspecified behaviour from the perspective of the dynamic loader, and
2327 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2328 results in a load failure now.
2330 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2331 implementation includes all the standard functions provided by
2334 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2335 thrd_detach, thrd_exit, and thrd_join for thread management.
2337 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2338 mtx_destroy for mutual exclusion.
2340 - call_once for function call synchronization.
2342 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2343 cnd_wait for conditional variables.
2345 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2347 Application developers must link against libpthread to use ISO C threads.
2349 Deprecated and removed features, and other changes affecting compatibility:
2351 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2352 installed. Software that was using either header should be updated to
2353 use standard <stdio.h> interfaces instead.
2355 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2356 This was never required by the C standard, and the macros just expanded
2357 to call alternative names for the same functions. If you hoped getc and
2358 putc would provide performance improvements over fgetc and fputc, instead
2359 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2360 necessary, flockfile and funlockfile.
2362 * All stdio functions now treat end-of-file as a sticky condition. If you
2363 read from a file until EOF, and then the file is enlarged by another
2364 process, you must call clearerr or another function with the same effect
2365 (e.g. fseek, rewind) before you can read the additional data. This
2366 corrects a longstanding C99 conformance bug. It is most likely to affect
2367 programs that use stdio to read interactive input from a terminal.
2370 * The macros 'major', 'minor', and 'makedev' are now only available from
2371 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2372 headers that happen to include <sys/types.h>. These macros are rarely
2373 used, not part of POSIX nor XSI, and their names frequently collide with
2374 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2375 further explanation.
2377 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2378 these macros should first include <sys/types.h>, and then include
2379 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2381 * The tilegx*-*-linux-gnu configurations are no longer supported.
2383 * The obsolete function ustat is no longer available to newly linked
2384 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2385 function has been deprecated in favor of fstatfs and statfs.
2387 * The obsolete function nfsservctl is no longer available to newly linked
2388 binaries. This function was specific to systems using the Linux kernel
2389 and could not usefully be used with the GNU C Library on systems with
2390 version 3.1 or later of the Linux kernel.
2392 * The obsolete function name llseek is no longer available to newly linked
2393 binaries. This function was specific to systems using the Linux kernel
2394 and was not declared in a header. Programs should use the lseek64 name
2395 for this function instead.
2397 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2398 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2399 previously selected by them is now always enabled.
2401 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2402 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2403 restriction (rejecting '_' in host names, among other things) has been
2404 removed, for increased compatibility with non-IDN name resolution.
2406 * The fcntl function now have a Long File Support variant named fcntl64. It
2407 is added to fix some Linux Open File Description (OFD) locks usage on non
2408 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2409 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2410 locks act as a cancellation entrypoint.
2412 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2413 ecb_crypt, and des_setparity are no longer available to newly linked
2414 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2415 longer installed. These functions encrypted and decrypted data with the
2416 DES block cipher, which is no longer considered secure. Software that
2417 still uses these functions should switch to a modern cryptography library,
2420 * Reflecting the removal of the encrypt and setkey functions above, the
2421 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2422 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2425 * The obsolete function fcrypt is no longer available to newly linked
2426 binaries. It was just another name for the standard function crypt,
2427 and it has not appeared in any header file in many years.
2429 * We have tentative plans to hand off maintenance of the passphrase-hashing
2430 library, libcrypt, to a separate development project that will, we hope,
2431 keep up better with new passphrase-hashing algorithms. We will continue
2432 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2433 'crypt_r' should not need to change at all; however, distributions will
2434 need to install <crypt.h> and libcrypt from a separate project.
2436 In this release, if the configure option --disable-crypt is used, glibc
2437 will not install <crypt.h> or libcrypt, making room for the separate
2438 project's versions of these files. The plan is to make this the default
2439 behavior in a future release.
2441 Changes to build and runtime requirements:
2443 GNU make 4.0 or later is now required to build glibc.
2445 Security related changes:
2447 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2448 been fixed by removing the glibc-internal IDNA implementation and using
2449 the system-provided libidn2 library instead. Originally reported by Hanno
2450 Böck and Christian Weisgerber.
2452 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2453 architecture could corrupt memory. Reported by Max Horn.
2455 CVE-2018-11236: Very long pathname arguments to realpath function could
2456 result in an integer overflow and buffer overflow. Reported by Alexey
2459 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2460 architecture could write beyond the target buffer, resulting in a buffer
2461 overflow. Reported by Andreas Schwab.
2463 The following bugs are resolved with this release:
2465 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2466 [6889] manual: 'PWD' mentioned but not specified
2467 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2468 when __WORDSIZE != 64
2469 [13762] regex: re_search etc. should return -2 on memory exhaustion
2470 [13888] build: /tmp usage during testing
2471 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2472 [14092] nptl: Support C11 threads
2473 [14095] localedata: Review / update collation data from Unicode / ISO
2475 [14508] libc: -Wformat warnings
2476 [14553] libc: Namespace pollution loff_t in sys/types.h
2477 [14890] libc: Make NT_PRFPREG canonical.
2478 [15105] libc: Extra PLT references with -Os
2479 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2481 [16335] manual: Feature test macro documentation incomplete and out of
2483 [16552] libc: Unify umount implementations in terms of umount2
2484 [17082] libc: htons et al.: statement-expressions prevent use on global
2485 scope with -O1 and higher
2486 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2487 [17438] localedata: pt_BR: wrong d_fmt delimiter
2488 [17662] libc: please implement binding for the new renameat2 syscall
2489 [17721] libc: __restrict defined as /* Ignore */ even in c11
2490 [17979] libc: inconsistency between uchar.h and stdint.h
2491 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2492 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2493 horrible machine code)
2494 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2496 [18471] libc: llseek should be a compat symbol
2497 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2499 [18991] nss: nss_files skips large entry in database
2500 [19239] libc: Including stdlib.h ends up with macros major and minor being
2502 [19463] libc: linknamespace failures when compiled with -Os
2503 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2504 [19527] locale: Normalized charset name not recognized by setlocale
2505 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2506 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2508 [19728] network: out of bounds stack read in libidn function
2509 idna_to_ascii_4i (CVE-2016-6261)
2510 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2511 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2512 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2514 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2515 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2516 [20419] dynamic-link: files with large allocated notes crash in
2518 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2519 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2520 [20980] manual: CFLAGS environment variable replaces vital options
2521 [21163] regex: Assertion failure in pop_fail_stack when executing a
2522 malformed regexp (CVE-2015-8985)
2523 [21234] manual: use of CFLAGS makes glibc detect no optimization
2524 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2525 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2526 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2527 [21508] locale: intl/tst-gettext failure with latest msgfmt
2528 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2529 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2530 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2532 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2534 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2535 [22247] network: Integer overflow in the decode_digit function in
2536 puny_decode.c in libidn (CVE-2017-14062)
2537 [22342] nscd: NSCD not properly caching netgroup
2538 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2539 [22550] localedata: es_ES locale (and other es_* locales): collation
2540 should treat ñ as a primary different character, sync the collation
2541 for Spanish with CLDR
2542 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2543 by gcc configured with --enable-default-pie
2544 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2545 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2546 crossing 2GB threshold (CVE-2017-18269)
2547 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2549 [22735] time: Misleading typo in time.h source comment regarding
2551 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2552 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2553 `__assert_perror_fail ()' to `__assert_fail_base ()'
2554 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2556 [22786] libc: Stack buffer overflow in realpath() if input size is close
2557 to SSIZE_MAX (CVE-2018-11236)
2558 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2559 through an absolute DT_NEEDED path
2560 [22792] build: tcb-offsets.h dependency dropped
2561 [22797] libc: pkey_get() uses non-reserved name of argument
2562 [22807] libc: PTRACE_* constants missing for powerpc
2563 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2564 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2565 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2566 [22848] localedata: ca_ES: update date definitions from CLDR
2567 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2568 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2569 [22896] localedata: Update locale data for an_ES
2570 [22902] math: float128 test failures with GCC 8
2571 [22918] libc: multiple common of `__nss_shadow_database'
2572 [22919] libc: sparc32: backtrace yields infinite backtrace with
2574 [22926] libc: FTBFS on powerpcspe
2575 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2577 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2578 [22947] libc: FAIL: misc/tst-preadvwritev2
2579 [22963] localedata: cs_CZ: Add alternative month names
2580 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2581 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2582 [22998] dynamic-link: execstack tests are disabled when SELinux is
2584 [23005] network: Crash in __res_context_send after memory allocation
2586 [23007] math: strtod cannot handle -nan
2587 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2588 [23036] regex: regex equivalence class regression
2589 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2590 [23069] libc: sigaction broken on riscv64-linux-gnu
2591 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2592 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2593 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2594 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2595 and libc build with -Os)
2596 [23140] localedata: More languages need two forms of month names
2597 [23145] libc: _init/_fini aren't marked as hidden
2598 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2599 [23171] math: C++ iseqsig for long double converts arguments to double
2600 [23178] nscd: sudo will fail when it is run in concurrent with commands
2601 that changes /etc/passwd
2602 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2604 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2605 [23208] localedata: New locale - Lower Sorbian (dsb)
2606 [23233] regex: Memory leak in build_charclass_op function in file
2608 [23236] stdio: Harden function pointers in _IO_str_fields
2609 [23250] nptl: Offset of __private_ss differs from GCC
2610 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2611 -mtune=generic -mfpmath=sse
2612 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2614 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2615 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2617 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2618 [23277] math: nan function should not have const attribute
2619 [23279] math: scanf and strtod wrong for some hex floating-point
2620 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2622 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2623 [23303] build: undefined reference to symbol
2624 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2625 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2627 [23313] stdio: libio vtables validation and standard file object
2629 [23329] libc: The __libc_freeres infrastructure is not properly run across
2631 [23349] libc: Various glibc headers no longer compatible with
2633 [23351] malloc: Remove unused code related to heap dumps and malloc
2635 [23363] stdio: stdio-common/tst-printf.c has non-free license
2636 [23396] regex: Regex equivalence regression in single-byte locales
2637 [23422] localedata: oc_FR: More updates of locale data
2638 [23442] build: New warning with GCC 8
2639 [23448] libc: Out of bounds access in IBM-1390 converter
2640 [23456] libc: Wrong index_cpu_LZCNT
2641 [23458] build: tst-get-cpu-features-static isn't added to tests
2642 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2644 [23467] dynamic-link: x86/CET: A property note parser bug
2651 * The GNU C Library can now be compiled with support for building static
2652 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2653 executables are like static executables but can be loaded at any address
2654 and provide additional security hardening benefits at the cost of some
2655 memory and performance. When the library is built with --enable-static-pie
2656 the resulting libc.a is usable with GCC 8 and above to create static PIE
2657 executables using the GCC option '-static-pie'. This feature is currently
2658 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2659 aarch64 with binutils 2.30 or later.
2661 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2662 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2665 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2667 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2669 * In order to support faster and safer process termination the malloc API
2670 family of functions will no longer print a failure address and stack
2671 backtrace after detecting heap corruption. The goal is to minimize the
2672 amount of work done after corruption is detected and to avoid potential
2673 security issues in continued process execution. Reducing shutdown time
2674 leads to lower overall process restart latency, so there is benefit both
2675 from a security and performance perspective.
2677 * The abort function terminates the process immediately, without flushing
2678 stdio streams. Previous glibc versions used to flush streams, resulting
2679 in deadlocks and further data corruption. This change also affects
2680 process aborts as the result of assertion failures.
2682 * On platforms where long double has the IEEE binary128 format (aarch64,
2683 alpha, mips64, riscv, s390 and sparc), the math library now implements
2684 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2685 These are the same interfaces added in version 2.26 for some platforms where
2686 this format is supported but is not the format of long double.
2688 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2689 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2690 implements interfaces for that type, as defined by ISO/IEC TS
2691 18661-3:2015. These are corresponding interfaces to those supported for
2694 * The math library now implements interfaces for the _Float32, _Float64 and
2695 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2696 corresponding interfaces to those supported for _Float128.
2698 * glibc now implements the memfd_create and mlock2 functions on Linux.
2700 * Support for memory protection keys was added. The <sys/mman.h> header now
2701 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2704 * The copy_file_range function was added.
2706 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2708 * The ldconfig utility now processes `include' directives using the C/POSIX
2709 collation ordering. Previous glibc versions used locale-specific
2710 ordering, the change might break systems that relied on that.
2712 * Support for two grammatical forms of month names has been added.
2713 In a call to strftime, the "%B" and "%b" format specifiers will now
2714 produce the grammatical form required when the month is used as part
2715 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2716 required when the month is named by itself. For instance, in Greek
2717 and in many Slavic and Baltic languages, "%B" will produce the month
2718 in genitive case, and "%OB" will produce the month in nominative case.
2720 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2721 are all valid and will all accept any known form of month
2722 name---standalone or complete, abbreviated or full. In a call to
2723 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2724 the strings used by "%B" and "%b", respectively. New query
2725 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2726 used by "%OB" and "%Ob", respectively.
2728 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2729 define the strings for %OB and %Ob, respectively; these have the
2730 same syntax as "mon" and "abmon". These arrays are optional; if they
2731 are not provided then they have the same content as "mon" and "abmon",
2734 These features are provided for locales which define "alt_mon" and/or
2735 "ab_alt_mon" in their locale source data. This release includes such
2736 alternative month name data for the following languages: Belarusian,
2737 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2739 This feature is currently a GNU extension, but it is expected to
2740 be added to the next revision of POSIX, and it is also already
2741 available on some BSD-derived operating systems.
2743 This feature will cause existing statically compiled applications
2744 to fail to load locales and fall back to the builtin C/POSIX locales.
2745 See notes below for other changes affecting compatibility.
2747 * Support for the RISC-V ISA running on Linux has been added. This port
2748 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2749 for the following ISA and ABI pairs:
2755 Deprecated and removed features, and other changes affecting compatibility:
2757 * Statically compiled applications attempting to load locales compiled for the
2758 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2759 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2760 support for two grammatical forms of the month names, also extends the locale
2761 data binary format. Static applications needing locale support must be
2762 recompiled to match the runtime and data they are deployed with. In some
2763 distributions there is an upgrade window where dynamically linked applications
2764 may use a new library but the old locale data and also fall back to the
2765 builtin C/POSIX locales; restarting the application process is sufficient to
2768 * Support for statically linked applications which call dlopen is deprecated
2769 and will be removed in a future version of glibc. Applications which call
2770 dlopen need to be linked dynamically instead.
2772 * Support for old programs which use internal stdio data structures and
2773 functions is deprecated. This includes programs which use the C++ streams
2774 provided by libstdc++ in GCC 2.95. Programs which use the internal
2775 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2776 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2777 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2778 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2779 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2780 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2781 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2782 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2783 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2784 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2785 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2786 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2787 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2788 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2789 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2790 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2791 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2792 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2793 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2794 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2795 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2796 future version of glibc. Unlike other symbol removals, these old
2797 applications will not be supported using compatibility symbols.
2799 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2800 defined by <sys/ptrace.h>.
2802 * libm no longer supports SVID error handling (calling a user-provided
2803 matherr function on error) or the _LIB_VERSION variable to control error
2804 handling. (SVID error handling and the _LIB_VERSION variable still work
2805 for binaries linked against older versions of the GNU C Library.) The
2806 libieee.a library is no longer provided. math.h no longer defines struct
2807 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2808 TLOSS, PLOSS and HUGE.
2810 * The libm functions pow10, pow10f and pow10l are no longer supported for
2811 new programs. Programs should use the standard names exp10, exp10f and
2812 exp10l for these functions instead.
2814 * The mcontext_t type is no longer the same as struct sigcontext. On
2815 platforms where it was previously the same, this changes the C++ name
2816 mangling for interfaces involving this type.
2818 * The add-ons mechanism for building additional packages at the same time as
2819 glibc has been removed. The --enable-add-ons configure option is now
2822 * The --without-fp configure option is now ignored. Whether hardware
2823 floating-point instructions are used is now configured based on whether
2824 the compiler used at configure time (without any options implied by a
2825 --with-cpu= configure option) uses such instructions.
2827 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2828 the specified string can be parsed as a domain name.
2830 * In the malloc_info output, the <heap> element may contain another <aspace>
2831 element, "subheaps", which contains the number of sub-heaps.
2833 * The libresolv function p_secstodate is no longer supported for new
2836 * The tilepro-*-linux-gnu configuration is no longer supported.
2838 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2839 and will be removed in a future release. Software that is still using
2840 either header should be updated to use standard <stdio.h> interfaces
2843 libio.h was originally the header for a set of supported GNU extensions,
2844 but they have not been maintained as such in many years, they are now
2845 standing in the way of improvements to stdio, and we don't think there are
2846 any remaining external users. _G_config.h was never intended for public
2847 use, but predates the bits convention.
2849 Changes to build and runtime requirements:
2851 * bison version 2.7 or later is required to generate code in the 'intl'
2854 Security related changes:
2856 CVE-2009-5064: The ldd script would sometimes run the program under
2857 examination directly, without preventing code execution through the
2858 dynamic linker. (The glibc project disputes that this is a security
2859 vulnerability; only trusted binaries must be examined using the ldd
2862 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2863 suffered from a one-byte overflow during ~ operator processing (either
2864 on the stack or the heap, depending on the length of the user name).
2865 Reported by Tim Rühsen.
2867 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2868 would sometimes fail to free memory allocated during ~ operator
2869 processing, leading to a memory leak and, potentially, to a denial
2872 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2873 without GLOB_NOESCAPE, could write past the end of a buffer while
2874 unescaping user names. Reported by Tim Rühsen.
2876 CVE-2017-17426: The malloc function, when called with an object size near
2877 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2878 instead of NULL. This was a regression introduced with the new malloc
2879 thread cache in glibc 2.26. Reported by Iain Buclaw.
2881 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2882 to the allocation of too much memory. (This is not a security bug per se,
2883 it is mentioned here only because of the CVE assignment.) Reported by
2886 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2887 of the number of search path components. (This is not a security
2888 vulnerability per se because no trust boundary is crossed if the fix for
2889 CVE-2017-1000366 has been applied, but it is mentioned here only because
2890 of the CVE assignment.) Reported by Qualys.
2892 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2893 for AT_SECURE or SUID binaries could be used to load libraries from the
2896 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2897 succeeds without returning an absolute path due to unexpected behaviour
2898 of the Linux kernel getcwd syscall. Reported by halfdog.
2900 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2901 an object size near the value of SIZE_MAX, would return a pointer to a
2902 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2904 CVE-2018-6551: The malloc function, when called with an object size near
2905 the value of SIZE_MAX, would return a pointer to a buffer which is too
2906 small, instead of NULL.
2908 The following bugs are resolved with this release:
2910 [866] glob: glob should match dangling symlinks
2911 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2912 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2914 [5997] math: Very slow execution of sinf function
2915 [10580] localedata: hr_HR: updated locale
2916 [10871] locale: 'mon' array should contain both nominative and genitive
2918 [12349] localedata: eu_ES: incorrect thousands separator
2919 [13605] localedata: shn_MM: new Shan locale
2920 [13805] localedata: ru_RU: currency should use ',' as radix point
2921 [13953] localedata: km_KH: locale update
2922 [13994] localedata: mjw_IN: new locale
2923 [14121] build: make writes .mo files in po directory
2924 [14333] libc: Fix the race between atexit() and exit()
2925 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2926 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2928 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2929 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2930 width Latin characters
2931 [15332] localedata: es_CU: locale update
2932 [15436] stdio: Don't close or flush stdio streams on abort
2933 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2935 [16148] localedata: ca_ES: incorrect thousands separator
2936 [16750] dynamic-link: ldd should not try to execute the binaries
2938 [16777] localedata: pl_PL: incorrect thousands separator in locale
2939 [16905] localedata: hanzi: new collation
2940 [17563] localedata: cmn_TW: add hanzi collation
2941 [17750] localedata: wrong collation order of diacritics in most locales
2942 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2944 [17956] build: Build fails on missing definitions from header file
2945 nss/nss.h when Mozilla NSS is used for cryptography
2946 [18203] libc: realpath() does not handle unreachable paths correctly
2947 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2948 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2949 [18822] libc: Internal functions are called via PLT
2950 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2951 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2952 [19574] libc: glibc should support building static PIE binaries
2953 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2955 [19971] glob: glob: Do not skip entries with zero d_ino values
2956 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2957 [20008] localedata: km_KH: convert to translit_neutral
2958 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2959 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2960 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2961 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2962 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2964 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2965 they're set, wrong errors returned by gaih_inet when lookup functions
2967 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2968 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2970 [20952] localedata: yuw_PG: new locale
2971 [21084] localedata: charmaps/IBM858: new codepage
2972 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2973 [21242] libc: assert gives pedantic warning in old gcc versions
2974 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2975 __regcall calling convention
2976 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2977 [21326] libc: C99 functions are not declared for C++11 and later if
2978 _GNU_SOURCE is not predefined by g++
2979 [21457] libc: sys/ucontext.h namespace
2980 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2981 [21660] math: GCC fails to compile a formula with tgmath.h
2982 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2983 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2984 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2985 [21684] math: tgmath.h handling of complex integers
2986 [21685] math: tgmath.h handling of bit-fields
2987 [21686] math: tgmath.h handling of __int128
2988 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2990 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2992 [21750] localedata: column width of characters incompatible with classical
2994 [21754] malloc: malloc: Perform as little work as possible after heap
2995 consistency check failures
2996 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2997 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2998 [21791] string: Unused XXX_chk_XXX functions in libc.a
2999 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3001 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3003 [21845] localedata: Added new Locale bho_NP
3004 [21853] localedata: Fix abday Which looks same as day in zh_SG
3005 [21854] localedata: Added New Locale en_SC
3006 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3007 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3008 _dl_runtime_resolve_avx_slow
3009 [21885] network: getaddrinfo: gethosts does not release resolver context
3010 on memory allocation failure
3011 [21899] libc: XPG4.2 sigaction namespace
3012 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3014 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3016 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3017 errno value, causing getaddrinfo to fail
3018 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3019 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3020 instead of EAI_NODATA
3021 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3022 constant PTRACE_SEIZE_DEVEL
3023 [21930] math: C-only gcc builtins used in <math.h> isinf
3024 [21932] network: Unpaired __resolv_context_get in generic get*_r
3026 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3027 [21944] libc: sigval namespace
3028 [21951] localedata: Update hanzi collation by stroke
3029 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3030 sysdeps/x86_64/fpu/e_expf.S
3031 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3032 allocation in syscall loops)
3033 [21959] localedata: Fix Country name for xh_ZA
3034 [21960] localedata: Fix abmon for bem_ZM
3035 [21966] math: AVX2 mathvec functions use FMA without checking
3036 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3037 [21971] localedata: Added New Locale for mfe_MU
3038 [21972] libc: assert macro requires operator== (int) for its argument type
3039 [21973] math: [sparc] libm missing sqrtl compat symbol
3040 [21974] libc: Remove __bb_init_func and __bb_exit_func
3041 [21982] string: stratcliff.c: error: assuming signed overflow does not
3043 [21986] stdio: __guess_grouping is called incorrectly
3044 [21987] math: [sparc32] wrong bits/long-double.h installed
3045 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3047 [22022] localedata: Missing country_name for mni_IN
3048 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3050 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3052 [22026] locale: iconv_open: heap overflow on gconv_init failure
3053 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3054 [22035] math: [m68k] bits/math-inline.h macro namespace
3055 [22038] localedata: Fix abbreviated weeks and months for Somali
3056 [22044] localedata: Remove redundant data for Limburgish Language
3057 [22050] malloc: Linking with -lmcheck does not hook
3058 __malloc_initialize_hook correctly
3059 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3060 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3061 [22070] localedata: charmaps/UTF-8: wcwidth for
3062 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3063 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3064 Jungseong and Jongseong) should be 0
3065 [22078] nss: nss_files performance issue in multi mode
3066 [22082] math: bits/math-finite.h exp10 condition
3067 [22086] libc: pcprofiledump incorrect cross-endian condition
3068 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3069 [22095] network: Name server address allocation memory leak in resolv.conf
3071 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3073 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3074 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3076 [22111] malloc: malloc: per thread cache is not returned when thread exits
3077 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3078 [22134] libc: [linux] implement fexecve with execveat
3079 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3081 [22145] libc: ttyname() gives up too early in the face of namespaces
3082 [22146] math: C++ build issue with float128 on x86_64
3083 [22153] nptl: nptl: save error code before process termination
3084 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3085 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3086 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3087 [22165] libc: [hppa] Text relocations in libc.so
3088 [22180] libc: destructor registered via __cxa_atexit is called twice
3089 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3090 symlinks") cause "make" segfaults
3091 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3093 [22207] libc: FAIL: stdlib/test-atexit-race
3094 [22225] math: nearbyint arithmetic moved before feholdexcept
3095 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3096 [22235] math: iscanonical in C++ and float128
3097 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3098 the svid compat wrapper
3099 [22244] math: ynf and yn are wrong without the svid compat wrapper
3100 [22273] libc: Improper assert in Linux posix_spawn implementation
3101 [22284] libc: -pg -pie doesn't work
3102 [22292] locale: localedef exits with error 4 when it should be error 1
3103 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3104 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3106 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3107 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3109 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3110 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3111 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3112 [22322] libc: [mips64] wrong bits/long-double.h installed
3113 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3114 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3116 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3117 [22343] malloc: Integer overflow in posix_memalign
3118 [22347] libc: getrandom() returns the number of bytes that were copied to
3119 the buffer even though the comments say "Return 0 on success and -1 on
3121 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3122 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3124 [22370] dynamic-link: Incorrect note padding check
3125 [22375] libc: malloc returns pointer from tcache_get when should return
3126 NULL (CVE-2017-17426)
3127 [22377] math: iseqsig, float128 and C++
3128 [22382] localedata: Error in tpi_PG locale
3129 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3130 inside the ASCII printable range
3131 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3133 [22403] localedata: Slash needs escaping in some locales
3134 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3135 [22409] network: res_hnok does not accept some host names used on the
3137 [22412] network: res_dnok, res_hnok should perform syntax checks
3138 [22413] network: ns_name_pton ignores syntactically invalid trailing
3140 [22415] stdio: setvbuf can lead to invalid free/segfault
3141 [22432] build: Non-deterministic build
3142 [22439] malloc: malloc_info should compute summary statistics for all sub-
3144 [22442] network: if_nametoindex could report index for the wrong
3145 networking interface
3146 [22446] build: aliasing violation calling readlink in handle_request
3147 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3148 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3149 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3150 __nscd_hash/__nss_hash
3151 [22463] network: p_secstodate overflow handling
3152 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3153 [22478] libc: sigwait can fail with EINTR
3154 [22505] libc: ldconfig processes include directive in locale-specific
3156 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3157 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3158 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3159 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3160 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3161 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3162 same as for Croatian
3163 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3164 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3165 [22577] libc: missing newline after "cannot allocate TLS data structures
3167 [22588] manual: manual/conf.texi: missing underscore in front of
3169 [22593] math: nextafter and nexttoward are declared with const attribute
3170 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3171 [22603] string: ia64 memchr overflows internal pointer check
3172 [22605] libc: SH clone does not set the exit code correctly
3173 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3175 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3176 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3177 modified in case of success
3178 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3179 [22615] manual: manual: ambiguous wording about errno value in case of
3181 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3183 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3184 binaries or if /proc is not mounted (CVE-2017-16997)
3185 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3186 [22630] build: $(no-pie-ldflag) is no longer effective
3187 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3188 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3189 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3190 [22637] nptl: guard size is subtracted from thread stack size instead of
3192 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3193 [22657] localedata: hu_HU: Avoid double space in date
3194 [22660] math: fmax, fmin sNaN handling on alpha
3195 [22664] libc: New warning of GCC8
3196 [22665] math: alpha: ceil and floor raise inexact exceptions
3197 [22666] math: alpha: trunc raise inexact exceptions
3198 [22667] libc: makecontext lacks stack alignment on i386
3199 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3200 [22679] libc: getcwd(3) can succeed without returning an absolute path
3202 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3203 elision and tunables
3204 [22687] math: [powerpc-nofpu] complex long double functions spurious
3206 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3207 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3208 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3210 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3211 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3213 [22701] nis: Incomplete removal of libnsl
3214 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3215 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3216 [22715] dynamic-link: FAIL: elf/tst-audit10
3217 [22719] libc: Backtrace tests fail on hppa
3218 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3219 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3220 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3221 before the first call to crypt_r () in crypt/badsalttest.c
3228 * A per-thread cache has been added to malloc. Access to the cache requires
3229 no locks and therefore significantly accelerates the fast path to allocate
3230 and free small amounts of memory. Refilling an empty cache requires locking
3231 the underlying arena. Performance measurements show significant gains in a
3232 wide variety of user workloads. Workloads were captured using a special
3233 instrumented malloc and analyzed with a malloc simulator. Contributed by
3234 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3236 * Unicode 10.0.0 Support: Character encoding, character type info, and
3237 transliteration tables are all updated to Unicode 10.0.0, using
3238 generator scripts contributed by Mike FABIAN (Red Hat).
3239 These updates cause user visible changes, especially the changes in
3240 wcwidth for many emoji characters cause problems when emoji sequences
3241 are rendered with pango, see for example:
3242 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3244 * Collation of Hungarian has been overhauled and is now consistent with "The
3245 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3248 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3250 - The GNU C Library will now detect when /etc/resolv.conf has been
3251 modified and reload the changed configuration. The new resolver option
3252 “no-reload” (RES_NORELOAD) disables this behavior.
3254 - The GNU C Library now supports an arbitrary number of search domains
3255 (configured using the “search” directive in /etc/resolv.conf);
3256 previously, there was a hard limit of six domains. For backward
3257 compatibility, applications that directly modify the ‘_res’ global
3258 object are still limited to six search domains.
3260 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3261 Library will now randomly pick a name server from the configuration as a
3262 starting point. (Previously, the second name server was always used.)
3264 * The tunables feature is now enabled by default. This allows users to tweak
3265 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3267 * New function reallocarray, which resizes an allocated block (like realloc)
3268 to the product of two sizes, with a guaranteed clean failure upon integer
3269 overflow in the multiplication. Originally from OpenBSD, contributed by
3270 Dennis Wölfing and Rüdiger Sonderfeld.
3272 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3273 These are extended versions of preadv and pwritev, respectively, taking an
3274 additional flags argument. The set of supported flags depends on the
3275 running kernel; full support currently requires kernel 4.7 or later.
3277 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3278 create a new session ID for the spawned process. This feature is
3279 scheduled to be added to the next major revision of POSIX; for the time
3280 being, it is available under _GNU_SOURCE.
3282 * errno.h is now safe to use from C-preprocessed assembly language on all
3283 supported operating systems. In this context, it will only define the
3284 Exxxx constants, as preprocessor macros expanding to integer literals.
3286 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3287 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3288 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3289 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3291 To compile programs that use this feature, the compiler must support
3292 128-bit floating point with the type name _Float128 (as defined by TS
3293 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3294 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3295 must be defined to make the new interfaces visible.
3297 The new functions and macros correspond to those present for other
3298 floating-point types (except for a few obsolescent interfaces not
3299 supported for the new type), with F128 or f128 suffixes; for example,
3300 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3301 printf or scanf formats for the new type; the strfromf128 and strtof128
3302 interfaces should be used instead.
3304 Deprecated and removed features, and other changes affecting compatibility:
3306 * The synchronization that pthread_spin_unlock performs has been changed to
3307 now be equivalent to a C11 atomic store with release memory order to the
3308 spin lock's memory location. Previously, several (but not all)
3309 architectures used stronger synchronization (e.g., containing what is
3310 often called a full barrier). This change can improve performance, but
3311 may affect odd fringe uses of spin locks that depend on the previous
3312 behavior (e.g., using spin locks as atomic variables to try to implement
3313 Dekker's mutual exclusion algorithm).
3315 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3318 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3319 will only be built and installed when the GNU C Library is configured with
3320 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3321 as TIRPC or rpcsvc-proto, to be used.
3323 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3324 libnss_compat, are deprecated, and will not be built or installed by
3327 The NIS(+) support library, libnsl, is also deprecated. By default, a
3328 compatibility shared library will be built and installed, but not headers
3329 or development libraries. Only a few NIS-related programs require this
3330 library. (In particular, the GNU C Library has never required programs
3331 that use 'gethostbyname' to be linked with libnsl.)
3333 Replacement implementations based on TIRPC, which additionally support
3334 IPv6, are available from <https://github.com/thkukuk/>. The configure
3335 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3336 name service modules, to be built and installed.
3338 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3339 support is enabled, the configured recursive resolver must support EDNS.
3340 (Responding to EDNS-enabled queries with responses which are not
3341 EDNS-enabled is fine, but FORMERR responses are not.)
3343 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3344 servers have not supported this opcode for a long time.
3346 * The _res_opcodes variable has been removed from libresolv. It had been
3347 exported by accident.
3349 * <string.h> no longer includes inline versions of any string functions,
3350 as this kind of optimization is better done by the compiler. The macros
3351 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3353 * The nonstandard header <xlocale.h> has been removed. Most programs should
3354 use <locale.h> instead. If you have a specific need for the definition of
3355 locale_t with no other declarations, please contact
3356 libc-alpha@sourceware.org and explain.
3358 * The obsolete header <sys/ultrasound.h> has been removed.
3360 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3362 * The obsolete function cfree has been removed. Applications should use
3365 * The stack_t type no longer has the name struct sigaltstack. This changes
3366 the C++ name mangling for interfaces involving this type.
3368 * The ucontext_t type no longer has the name struct ucontext. This changes
3369 the C++ name mangling for interfaces involving this type.
3371 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3372 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3373 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3374 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3375 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3376 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3377 fpregset_t type no longer has the name struct fpu. This changes the C++
3378 name mangling for interfaces involving those types.
3380 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3381 synced with the kernel:
3383 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3384 are not supported on this architecture and have been removed.
3386 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3387 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3388 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3390 Programs that assume the GET/SETREGS ptrace requests are universally
3391 available will now fail to build, instead of malfunctioning at runtime.
3393 Changes to build and runtime requirements:
3395 * Linux kernel 3.2 or later is required at runtime, on all architectures
3396 supported by that kernel. (This is a change from version 2.25 only for
3399 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3401 * On most architectures, GCC 4.9 or later is required to build the GNU C
3402 Library. On powerpc64le, GCC 6.2 or later is required.
3404 Older GCC versions and non-GNU compilers are still supported when
3405 compiling programs that use the GNU C Library. (We do not know exactly
3406 how old, and some GNU extensions to C may be _de facto_ required. If you
3407 are interested in helping us make this statement less vague, please
3408 contact libc-alpha@sourceware.org.)
3410 Security related changes:
3412 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3413 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3415 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3416 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3418 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3419 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3422 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3423 fixed (CVE-2017-12133).
3425 The following bugs are resolved with this release:
3427 [984] network: Respond to changed resolv.conf in gethostbyname
3428 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3429 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3431 [12189] libc: __stack_chk_fail should not attempt a backtrace
3433 [14096] time: Race condition on timezone/tst-timezone.out
3434 [14172] localedata: az_IR: new locale
3435 [14995] build: glibc fails to build if gold is the default linker, even if
3437 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3438 [16637] network: inet_pton function is accepting IPv6 with bad format
3439 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3440 x86 and other generic code
3441 [16875] localedata: ko_KR: fix lang_name
3442 [17225] localedata: ar_SY: localized month names for May and June are
3444 [17297] localedata: da_DK: wrong date_fmt string
3445 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3446 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3447 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3448 [19066] localedata: ar_SA abbreviated day and month names are in English
3449 [19569] network: resolv: Support an arbitrary number of search domains
3450 [19570] network: Implement random DNS server selection in the stub
3452 [19838] locale: localedef fails on PA-RISC
3453 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3454 order of 0D36 and 0D37
3455 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3457 [20098] libc: FAIL: debug/backtrace-tst on hppa
3458 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3460 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3462 [20313] localedata: Update locale data to Unicode 9.0
3463 [20424] manual: Document how to provide a malloc replacement
3464 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3466 [20686] locale: Add el_GR@euro to SUPPORTED.
3467 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3468 failures consistently
3469 [21015] dynamic-link: Document and fix --enable-bind-now
3470 [21016] nptl: pthread_cond support is broken on hppa
3471 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3472 frame-pointer on i386
3473 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3475 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3476 [21088] libc: Build fails with --enable-static-nss
3477 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3478 generic c code is used
3479 [21109] libc: Tunables broken on big-endian
3480 [21112] math: powf has large ulp errors with base close to 1 and exponent
3482 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3484 [21120] malloc: glibc malloc is incompatible with GCC 7
3485 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3487 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3488 (-0.0) when linking with -lieee
3489 [21171] math: log10, log2 and lgamma return incorrect results
3490 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3491 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3492 [21207] localedata: ce_RU: update weekdays from CLDR
3493 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3494 [21217] localedata: Update months from CLDR-31
3495 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3496 [21243] libc: support_delete_temp_file should issue warning for failed
3498 [21244] libc: support resolv_test_start() socket fd close should be
3500 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3501 new posix_spawn implementation
3502 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3503 leads to lower CPU frequency
3504 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3505 [21261] libc: [sparc64] bits/setjmp.h namespace
3506 [21267] network: [mips] bits/socket.h IOC* namespace
3507 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3508 [21270] libc: mmap64 silently truncates large offset values
3509 [21275] libc: posix_spawn always crashes on ia64 now
3510 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3511 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3512 [21289] libc: Incorrect declaration for 32-bit platforms with
3513 _FILE_OFFSET_BITS=64 causes build error
3514 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3515 not support gethostbyname4_r
3516 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3518 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3520 [21340] libc: Support POSIX_SPAWN_SETSID
3521 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3522 [21359] network: ns_name_pack needs additional byte in destination buffer
3523 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3524 against fragmentation attacks (CVE-2017-12132)
3525 [21369] network: resolv: Remove EDNS fallback
3526 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3528 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3529 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3530 [21393] stdio: Missing dup3 error check in freopen, freopen64
3531 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3532 [21399] localedata: Bad description for U00EC in
3533 localedata/charmaps/CP1254
3534 [21411] malloc: realloc documentation error
3535 [21426] network: sys/socket.h uio.h namespace
3536 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3537 [21445] libc: signal.h bsd_signal namespace
3538 [21455] network: Network headers stdint.h namespace
3539 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3541 [21475] network: resolv: Overlong search path is truncated mid-label
3542 [21511] libc: sigstack namespace
3543 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3544 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3545 bits/syscall.h: No such file or directory
3546 [21517] libc: struct sigaltstack namespace
3547 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3548 [21533] localedata: Update locale data to Unicode 10.0
3550 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3551 junk at end of line, first unrecognized character is `@'
3552 [21538] libc: SIG_HOLD missing for XPG4
3553 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3554 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3555 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3556 [21543] libc: sigevent namespace
3557 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3558 size for general purpose registers in mcontext_t structure
3559 [21550] libc: sigwait namespace
3560 [21552] libc: XPG4 bsd_signal namespace
3561 [21554] libc: sigpause namespace
3562 [21560] libc: sys/wait.h signal.h namespace
3563 [21561] libc: waitid namespace
3564 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3565 '/usr/include/stdlib.h': Permission denied
3566 [21575] libc: sys/wait.h missing struct rusage definition
3567 [21584] libc: sigaltstack etc namespace
3568 [21597] libc: siginterrupt namespace
3569 [21607] math: hppa: FAIL: math/test-tgmath
3570 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3572 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3573 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3574 stack and heap (CVE-2017-1000366)
3575 [21625] libc: wait3 namespace
3576 [21654] nss: Incorrect pointer alignment in NSS group merge result
3578 [21657] network: Parse interface zone id for node-local multicast
3579 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3581 [21666] libc: .symver is used on common symbol
3582 [21668] network: resolv: res_init cross-thread broadcast introduces race
3584 [21687] math: tgmath.h totalorder, totalordermag return type
3585 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3587 [21696] libc: Incorrect assumption of of __cpu_mask in
3588 posix/sched_cpucount.c
3589 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3590 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3592 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3593 leading to relocation crash
3594 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3595 `resolv_conf_matches (resp, conf)' failed.
3596 [21710] localedata: Added Samoan language locale for Samoa
3597 [21711] localedata: Pashto yesstr/nostr locale are missing
3598 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3599 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3600 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3601 [21723] localedata: yesstr/nostr missing for Chinese language locale
3602 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3604 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3606 [21728] localedata: New Locale for Tongan language
3607 [21729] localedata: incorrect LC_NAME fields for hi_IN
3608 [21733] localedata: yesstr and nostr are missing for zh_HK
3609 [21734] localedata: Missing yesstr and nostr are for kw_GB
3610 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3611 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3612 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3613 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3615 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3617 [21749] localedata: Wrong abbreviated day name (“abday”) for
3619 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3620 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3621 [21759] localedata: missing yesstr and nostr for Tigrinya
3622 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3623 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3624 [21767] localedata: Missing Bislama locales
3625 [21768] localedata: Missing yesstr and nostr for aa_ET
3626 [21770] localedata: Missing Field in li_NL
3627 [21778] nptl: Robust mutex may deadlock
3628 [21779] libc: MicroBlaze segfaults when loading libpthread
3629 [21783] localedata: Fix int_select international_call_prefixes
3630 [21784] localedata: Inconsistency in country_isbn
3631 [21788] localedata: Missing Country Postal Abbreviations
3632 [21794] localedata: Added-country_isbn-for-Italy
3633 [21795] localedata: Add/Fix country_isbn for France
3634 [21796] localedata: Added country_isbn for Republic of Korea
3635 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3636 [21799] localedata: Added int_select international_call_prefixes
3637 [21801] localedata: Added int_select international_call_prefixes
3638 [21804] nptl: Double semicolon in thread-shared-types.h
3639 [21807] localedata: LC_ADDRESS fix for pap_CW
3640 [21808] localedata: Fix LC_ADDRESS for pap_AW
3641 [21821] localedata: Added country_name in mai_IN
3642 [21822] localedata: Fix LC_TIME for mai_IN
3643 [21823] localedata: missing yesstr, nostr for sa_IN
3644 [21825] localedata: Fix name_mrs for mag_IN
3645 [21828] localedata: 2.26 changelog should mention user visible changes
3647 [21835] localedata: Added Maithili language locale for Nepal
3648 [21838] localedata: Removed redundant data for the_NP
3649 [21839] localedata: Fix LC_MONETARY for ta_LK
3650 [21844] localedata: Fix Latin characters and Months Sequence.
3651 [21848] localedata: Fix mai_NP Title Name
3656 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3657 24731-2:2010, is supported to enable declarations of functions from that
3658 TR. Note that not all functions from that TR are supported by the GNU C
3661 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3662 18661-1:2014, is supported to enable declarations of functions and macros
3663 from that TS. Note that not all features from that TS are supported by
3666 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3667 18661-4:2015, is supported to enable declarations of functions and macros
3668 from that TS. Note that most features from that TS are not supported by
3671 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3672 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3673 Since the GNU C Library defaults to a much newer revision of POSIX, this
3674 will only affect programs that specifically request an old conformance
3675 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3676 see a change in the visible declarations, but a program compiled with
3677 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3680 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3681 defined by all multithreaded code, but glibc has not required this for
3684 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3685 means that in a future release, the macros “major”, “minor”, and “makedev”
3686 will only be available from <sys/sysmacros.h>.
3688 These macros are not part of POSIX nor XSI, and their names frequently
3689 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3690 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3691 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3694 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3695 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3696 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3698 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3699 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3700 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3701 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3702 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3703 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3704 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3705 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3706 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3707 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3708 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3711 * New <math.h> features are added from TS 18661-1:2014:
3713 - Signaling NaN macros: SNANF, SNAN, SNANL.
3715 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3716 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3717 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3719 - llogb functions: the llogb, llogbf and llogbl functions, and the
3720 FP_LLOGB0 and FP_LLOGBNAN macros.
3722 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3725 - Comparison macros: iseqsig.
3727 - Classification macros: iscanonical, issubnormal, iszero.
3729 - Total order functions: totalorder, totalorderf, totalorderl,
3730 totalordermag, totalordermagf, totalordermagl.
3732 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3734 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3735 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3737 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3738 are added to libc. They convert a floating-point number into string.
3740 * Most of glibc can now be built with the stack smashing protector enabled.
3741 It is recommended to build glibc with --enable-stack-protector=strong.
3742 Implemented by Nick Alcock (Oracle).
3744 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3745 intended to be used instead of memset() to erase sensitive data after use;
3746 the compiler will not optimize out calls to explicit_bzero even if they
3747 are "unnecessary" (in the sense that no _correct_ program can observe the
3748 effects of the memory clear).
3750 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3751 to float instead of double. This does not affect the ABI of any libraries
3752 that are part of the GNU C Library, but may affect the ABI of other
3753 libraries that use this type in their interfaces.
3755 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3756 float_t and double_t types are now defined to long double instead of float
3757 and double. These options are not the default, and this does not affect
3758 the ABI of any libraries that are part of the GNU C Library, but it may
3759 affect the ABI of other libraries that use this type in their interfaces,
3760 if they are compiled or used with those options.
3762 * The getentropy and getrandom functions, and the <sys/random.h> header file
3765 * The buffer size for byte-oriented stdio streams is now limited to 8192
3766 bytes by default. Previously, on Linux, the default buffer size on most
3767 file systems was 4096 bytes (and thus remains unchanged), except on
3768 network file systems, where the buffer size was unpredictable and could be
3769 as large as several megabytes.
3771 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3772 for the Linux quota interface which predates kernel version 2.4.22 has
3775 * The malloc_get_state and malloc_set_state functions have been removed.
3776 Already-existing binaries that dynamically link to these functions will
3777 get a hidden implementation in which malloc_get_state is a stub. As far
3778 as we know, these functions are used only by GNU Emacs and this change
3779 will not adversely affect already-built Emacs executables. Any undumped
3780 Emacs executables, which normally exist only during an Emacs build, should
3781 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3783 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3784 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3785 “no-ip6-dotint” had already been the default, and support for the
3786 “ip6-dotint” option was removed from the Internet in 2006.
3788 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3789 flag from <resolv.h> have been removed. The option relied on a
3790 backwards-incompatible DNS extension which was never deployed on the
3793 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3794 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3795 They were already unimplemented.
3797 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3798 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3799 removed again from the IETF name lookup interface specification in RFC
3800 2553. Applications should use getaddrinfo instead.
3802 * DNSSEC-related declarations and definitions have been removed from the
3803 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3804 decode the data part of DNSSEC record types. Previous versions of glibc
3805 only implemented minimal support for the previous version of DNSSEC, which
3806 is incompatible with the currently deployed version.
3808 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3809 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3810 <arpa/nameser.h> header file because the distinction between RR types and
3811 meta-RR types is not officially standardized, subject to revision, and
3812 thus not suitable for encoding in a macro.
3814 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3815 and rhook members of the res_state type in <resolv.h> have been removed.
3816 The glibc stub resolver did not support these hooks, but the header file
3817 did not reflect that.
3819 * For multi-arch support it is recommended to use a GCC which has
3820 been built with support for GNU indirect functions. This ensures
3821 that correct debugging information is generated for functions
3822 selected by IFUNC resolvers. This support can either be enabled by
3823 configuring GCC with '--enable-gnu-indirect-function', or by
3824 enabling it by default by setting 'default_gnu_indirect_function'
3825 variable for a particular architecture in the GCC source file
3828 * GDB pretty printers have been added for mutex and condition variable
3829 structures in POSIX Threads. When installed and loaded in gdb these pretty
3830 printers show various pthread variables in human-readable form when read
3831 using the 'print' or 'display' commands in gdb.
3833 * Tunables feature added to allow tweaking of the runtime for an application
3834 program. This feature can be enabled with the '--enable-tunables' configure
3835 flag. The GNU C Library manual has details on usage and README.tunables has
3836 instructions on adding new tunables to the library.
3838 * A new version of condition variables functions have been implemented in
3839 the NPTL implementation of POSIX Threads to provide stronger ordering
3842 * A new version of pthread_rwlock functions have been implemented to use a more
3843 scalable algorithm primarily through not using a critical section anymore to
3846 Security related changes:
3848 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3849 have been created with makecontext could fail to terminate due to a
3850 missing .cantunwind annotation. This has been observed to lead to a hang
3851 (denial of service) in some Go applications compiled with gccgo. Reported
3852 by Andreas Schwab. (CVE-2016-6323)
3854 * The DNS stub resolver functions would crash due to a NULL pointer
3855 dereference when processing a query with a valid DNS question type which
3856 was used internally in the implementation. The stub resolver now uses a
3857 question type which is outside the range of valid question type values.
3860 The following bugs are resolved with this release:
3862 [4099] stdio: Overly aggressive caching by stream i/o functions.
3863 [7065] build: Support building glibc with -fstack-protector or -fstack-
3865 [9842] localedata: en_CA: incorrect date format
3866 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3867 before it started waiting
3868 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3869 [15765] nptl: sem_open is wrongly a cancellation point
3870 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3871 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3873 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3874 library linked with pthread
3875 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3876 "FIXME: Ingo" issue)
3877 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3878 [17252] libc: getrandom and getentropy syscall
3879 [17730] malloc: thread-local storage is sometimes improperly free()'d
3880 after being __libc_memalign()'d
3881 [18241] stdio: failed fseek on memstream does not set errno and can fail
3883 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3885 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3886 PTHREAD_PRIO_INHERIT mutex on ARM
3887 [18784] network: res_query and related function crash for special record
3888 type queries (CVE-2015-5180)
3889 [19380] math: strtod does not raise "inexact"
3890 [19387] string: Integer overflow in memchr
3891 [19390] string: Integer overflow in strncat
3892 [19398] build: linknamespace tests fail with massively parallel build
3893 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3895 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3896 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3897 [19514] libc: [PATCH] Fix spelling errors in spelling
3898 "implement"/"implementation" in several places
3899 [19582] network: Deprecate RES_USE_INET6
3900 [19673] manual: clog10 docs appear to be erroneous
3901 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3902 causes a segmentation fault
3903 [19826] libc: invalid pointer returned from __tls_get_addr with static
3905 [20016] network: resolv: Remove hooks support from the API
3906 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3908 [20033] math: [x86_64] vectorized math function don't call the __finite
3910 [20116] nptl: use after free in pthread_create
3911 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3912 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3914 [20311] nptl: please install proc_service.h
3915 [20366] libc: Compilation errors in installed headers in strict-compliance
3917 [20370] malloc: malloc: Arena free list management is still racy
3918 (incorrect fix in bug 19243)
3919 [20386] libc: assert (X = 0) does not result in GCC warning
3920 [20432] malloc: malloc: Minimize interface required for interposition
3921 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3922 in _Unwind_Backtrace (CVE-2016-6323)
3923 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3924 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3926 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3927 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3928 [20477] network: resolv: incorrect double-checked locking related to
3930 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3932 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3934 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3935 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3936 cause transition penalty
3937 [20517] math: sparcv9 missing fdiml compat symbol
3938 [20524] manual: strverscmp is inconsistent
3939 [20525] libc: <sys/quota.h> should be based on kernel headers
3940 [20539] math: GCC 7 -static -lm fails to link at -O3
3941 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3943 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3945 [20591] network: Remove obsolete DNSSEC support
3946 [20592] network: DNS resource record type classification macros in
3947 <arpa/nameser.h> are incorrect
3948 [20593] network: Update DNS RR type definitions
3949 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3950 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3952 [20629] network: libresolv: Remove support for bitstring labels
3954 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3955 assertion: "maxidx >= 2"
3956 [20660] math: [arm] Use VSQRT
3957 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3958 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3959 [20689] libc: Test for FMA should also check for AVX.
3960 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3961 [20715] math: iszero macro breaks existing code
3962 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3963 [20728] libc: powerpc: Missing TOC stub in clone
3964 [20729] build: glibc-2.24 fails to build for i486 with -Os
3965 [20750] build: Build fails with default PIE enabled gcc-6.x
3966 [20768] math: [alpha] sqrt fegetenv namespace
3967 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3969 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3970 __FLT_EVAL_METHOD__ is 2
3971 [20790] network: rpcgen buffer overrun in get_prog_declaration
3972 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3973 [20829] libc: crypt snprintf namespace
3974 [20847] libc: tst-vfork3 failure
3975 [20855] math: Default bits/mathdef.h has inappropriate float_t
3976 [20859] math: [sh4] FP_ILOGB0 invalid
3977 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3978 U+20AC), not same as GBK
3979 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3980 [20916] math: pow handling of sNaN arguments
3981 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3982 [20919] math: Bad pow (qNaN, 0) result with -lieee
3983 [20940] math: hypot sNaN handling
3984 [20947] math: fmax, fmin sNaN handling
3985 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3986 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3988 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3989 [20973] nptl: robust mutexes: Lost wake-ups
3990 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3991 [20978] nis: strlen on null pointer in nss_nisplus
3992 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3994 [21014] string: i686 memchr overflows internal pointer check
3995 [21019] libc: [mips] n32 lseek incorrect on overflow
3996 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3997 [21026] libc: [MIPS] readahead syscall is broken on n64
3998 [21028] math: Fallback fesetexceptflag should always succeed
3999 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4000 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4002 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4003 [21061] librt: [microblaze] librt lost clock_* exports
4004 [21073] libc: tunables: insecure environment variables passed to
4005 subprocesses with AT_SECURE
4006 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4010 * The minimum Linux kernel version that this version of the GNU C Library
4011 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4012 kernel version 2.6.32 or later suffices (on architectures that already
4013 required kernel versions more recent than 3.2, those requirements remain
4014 unchanged). Linux 3.2 or later kernel headers are required on all
4017 * The pap_AN locale has been deleted. This has been deprecated for a long
4018 time. It has been replaced by pap_AW & pap_CW, both of which have long
4019 been included in previous releases.
4021 * The readdir_r and readdir64_r functions have been deprecated. It is
4022 recommended to use readdir and readdir64 instead.
4024 * The type “union wait” has been removed. It was deprecated in the early
4025 1990s and never part of POSIX. Application code should use the int type
4026 instead of “union wait”.
4028 * A new NSS action is added to facilitate large distributed system
4029 administration. The action, MERGE, allows remote user stores like LDAP
4030 to be merged into local user stores like /etc/groups in order to provide
4031 easy to use, updated, and managed sets of merged credentials. The new
4032 action can be used by configuring it in /etc/nsswitch.conf:
4033 group: files [SUCCESS=merge] nis
4034 Implemented by Stephen Gallagher (Red Hat).
4036 * The deprecated __malloc_initialize_hook variable has been removed from the
4039 * The long unused localedef --old-style option has been removed. It hasn't
4040 done anything in over 16 years. Scripts using this option can safely
4043 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4044 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4045 return the next representable value in the direction of positive infinity
4046 and the nextdown functions return the next representable value in the
4047 direction of negative infinity. These are currently enabled as GNU
4050 Security related changes:
4052 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4053 could result in a stack overflow when getnetbyname was called with an
4054 overly long name. (CVE-2016-3075)
4056 * Previously, getaddrinfo copied large amounts of address data to the stack,
4057 even after the fix for CVE-2013-4458 has been applied, potentially
4058 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4059 instead. Reported by Michael Petlan. (CVE-2016-3706)
4061 * The glob function suffered from a stack-based buffer overflow when it was
4062 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4063 Reported by Alexander Cherepanov. (CVE-2016-1234)
4065 * The Sun RPC UDP client could exhaust all available stack space when
4066 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4067 alloca plugin for GCC. (CVE-2016-4429)
4069 * The IPv6 name server management code in libresolv could result in a memory
4070 leak for each thread which is created, performs a failing naming lookup,
4071 and exits. Over time, this could result in a denial of service due to
4072 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4074 The following bugs are resolved with this release:
4076 [1170] localedata: ne_NP: update Nepali locale definition file
4077 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4079 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4080 [6796] math: fdim() does not set errno on overflow
4081 [10354] libc: posix_spawn should use vfork() in more cases than presently
4082 [11213] localedata: localedata: add copyright disclaimer to locale files
4083 [12143] localedata: chr_US: new Cherokee locale
4084 [12450] localedata: sgs_LT: new locale
4085 [12676] localedata: ln_CD: new locale
4086 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4088 [13304] math: fma, fmaf, fmal produce wrong results
4089 [14259] build: --localedir arg to configure is ignored
4090 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4091 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4092 [14934] localedata: es_CL: wrong first weekday chilean locale
4093 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4095 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4097 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4098 [15368] nptl: raise() is not async-signal-safe
4099 [15479] math: ceil, floor, round and trunc raise inexact exception
4100 [15578] localedata: kk_KZ: various updates
4101 [16003] localedata: pap_AN: punt old locale
4102 [16137] localedata: iw_IL: punt old locale
4103 [16190] localedata: eo: new esperanto locale
4104 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4105 [16742] malloc: race condition: pthread_atfork() called before first
4106 malloc() results in unexpected locking behaviour/deadlocks
4107 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4109 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4110 [17565] localedata: pt_PT: wrong (work-)week start
4111 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4112 [17950] build: Build fails with -msse
4113 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4114 [18433] libc: posix_spawn does not return correctly upon failure to
4116 [18453] localedata: charmaps/IBM875: incorrect codes
4117 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4119 [18896] localedata: he_IL: improvements for currency
4120 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4121 Romanian locale data
4122 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4124 [19056] libc: Deprecate readdir_r
4125 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4127 [19198] localedata: nl_NL: small improvements for Dutch locales
4128 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4129 nameservers (CVE-2016-5417)
4130 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4132 [19400] locale: Language missing in "iso-639.def", trivial fix in
4134 [19431] malloc: Deadlock between fflush, getdelim, and fork
4135 [19505] libc: Incorrect file descriptor validity checks in
4136 posix_spawn_file_actions_add{open,close,dup2}
4137 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4138 when using RTLD_NEXT
4139 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4140 `intl/{gettextP,loadinfo}.h'
4141 [19534] libc: execle, execlp may use malloc
4142 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4143 [19573] network: res_nclose and __res_maybe_init disagree about name
4144 server initialization, breaking Hesiod
4145 [19575] localedata: Status of GB18030 tables
4146 [19581] localedata: sr_* date_fmt string contains additional newline
4147 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4149 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4150 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4151 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4152 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4154 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4156 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4158 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4159 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4160 [19633] locale: strfmon_l applies global locale to number formatting
4161 [19642] network: Memory leak in getnameinfo
4162 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4163 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4165 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4166 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4168 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4169 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4171 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4173 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4175 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4176 pointers and lengths in error-case.
4177 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4178 report errors on UTF-16 surrogates values.
4179 [19755] nscd: nscd assertion failure in gc
4180 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4181 [19759] libc: mempcpy shouldn't be inlined
4182 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4183 [19765] libc: s390 needs an optimized mempcpy
4184 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4185 NAME_MAX limit assumption (CVE-2016-1234)
4186 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4187 [19787] network: Missing and incorrect truncation checks in getnameinfo
4188 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4190 [19791] network: Assertion failure in res_query.c with un-connectable name
4192 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4193 [19822] math: libm.so install clobbers old version
4194 [19825] network: resolv: send_vc can return uninitialized data in second
4195 response to getaddrinfo
4196 [19830] network: nss_dns: should check RDATA length against buffer length
4197 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4198 confronted with A/AAAA records of invalid size
4199 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4200 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4201 [19853] stdio: Printing IBM long double in decimal with high precision is
4203 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4204 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4205 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4207 [19865] network: Assertion failure or memory leak in
4208 _nss_dns_getcanonname_r
4209 [19868] network: nss_dns: netent code does not skip over non-PTR records
4210 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4212 [19881] string: Improve x86-64 memset
4213 [19907] string: Incorrect memcpy tests
4214 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4216 [19925] libc: termios.h XCASE namespace
4217 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4218 [19929] libc: limits.h NL_NMAX namespace
4219 [19931] stdio: Memory leak in vfprintf
4220 [19957] libc: clone(CLONE_VM) access invalid parent memory
4221 [19963] localedata: en_IL: New locale
4222 [19989] stdio: stdio.h cuserid namespace
4223 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4225 [19996] locale: langinfo.h nl_langinfo_l namespace
4226 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4227 [20010] network: getaddrinfo: Stack overflow in hostent translation
4229 [20012] stdio: libio: fmemopen append mode failure
4230 [20014] stdio: stdio.h namespace for pre-threads POSIX
4231 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4232 [20023] libc: fcntl.h timespec namespace
4233 [20024] math: [x86_64] vectorized sincos trashes the stack
4234 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4235 [20041] time: sys/time.h timespec namespace
4236 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4237 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4238 [20051] libc: ttyslot in wrong header under wrong conditions
4239 [20054] libc: gethostname not declared for XPG4
4240 [20055] libc: termios.h missing tcgetsid for XPG4
4241 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4243 [20073] libc: sys/stat.h fchmod namespace
4244 [20074] libc: stdlib.h rand_r namespace
4245 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4246 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4248 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4249 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4251 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4252 [20119] libc: Wrong mask for processors level type from CPUID
4253 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4254 AS not supporting AVX512
4255 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4257 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4258 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4260 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4261 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4262 [20178] libc: posix_spawn{p} should not call exit
4263 [20191] stdio: libio: vtables hardening
4264 [20195] string: FMA4 detection requires CPUID execution with register
4266 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4267 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4269 [20212] math: acos (sNaN) returns sNaN
4270 [20213] math: asin (sNaN) returns sNaN
4271 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4272 [20218] math: [i386] asinhl (sNaN) returns sNaN
4273 [20219] math: [i386] atanhl (sNaN) returns sNaN
4274 [20222] stdio: fopencookie: Mangle function pointers
4275 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4276 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4277 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4279 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4280 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4281 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4282 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4283 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4284 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4285 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4286 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4287 [20240] math: modf (sNaN) returns sNaN
4288 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4289 [20250] math: frexp (sNaN) returns sNaN
4290 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4291 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4293 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4294 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4295 subscript is below array bounds [-Werror=array-bounds]
4296 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4297 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4299 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4300 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4302 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4303 "invalid" exceptions
4304 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4305 [20316] localedata: id_ID: Februari instead of Pebruari
4306 [20327] string: POWER8 strcasecmp returns incorrect result
4307 [20347] math: Failure: Test: j0_downward (0xap+0)
4308 [20348] libc: FAIL: misc/tst-preadvwritev64
4309 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4310 [20350] libc: There is no test for p{read,write}64
4311 [20357] math: Incorrect cos result for 1.5174239687223976
4312 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4316 * Unicode 8.0.0 Support: Character encoding, character type info, and
4317 transliteration tables are all updated to Unicode 8.0.0, using new
4318 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4319 These updates cause user visible changes, such as the fixes for bugs
4320 89, 16061, and 18568.
4322 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4323 kernel-internal CPU set size. This means that requests that change the
4324 CPU affinity which failed before (for example, an all-ones CPU mask) will
4325 now succeed. Applications that need to determine the effective CPU
4326 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4327 setting it because the kernel can adjust it (and the previous size check
4328 would not detect this in the majority of cases).
4330 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4331 the following new symbols are used: fts64_children, fts64_close,
4332 fts64_open, fts64_read and fts64_set.
4334 * getaddrinfo now detects certain invalid responses on an internal netlink
4335 socket. If such responses are received, an affected process will
4336 terminate with an error message of "Unexpected error <number> on netlink
4337 descriptor <number>" or "Unexpected netlink response of size <number> on
4338 descriptor <number>". The most likely cause for these errors is a
4339 multi-threaded application which erroneously closes and reuses the netlink
4340 file descriptor while it is used by getaddrinfo.
4342 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4343 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4344 unnecessary serialization of memory allocation requests across threads.
4345 The defect is now corrected. Users should see a substantial increase in
4346 the concurent throughput of allocation requests for applications which
4347 trigger this bug. Affected applications typically create and
4348 destroy threads frequently. (Bug 19048 was reported and analyzed by
4351 * There is now a --disable-timezone-tools configure option for disabling the
4352 building and installing of the timezone related utilities (zic, zdump, and
4353 tzselect). This is useful for people who build the timezone data and code
4354 independent of the GNU C Library.
4356 * The obsolete header <regexp.h> has been removed. Programs that require
4357 this header must be updated to use <regex.h> instead.
4359 * The obsolete functions bdflush, create_module, get_kernel_syms,
4360 query_module and uselib are no longer available to newly linked binaries;
4361 the header <sys/kdaemon.h> has been removed. These functions and header
4362 were specific to systems using the Linux kernel and could not usefully be
4363 used with the GNU C Library on systems with version 2.6 or later of the
4366 * Optimized string, wcsmbs and memory functions for IBM z13.
4367 Implemented by Stefan Liebler.
4369 * Newly linked programs that define a variable called signgam will no longer
4370 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4371 require signgam to be set by those functions must ensure that they use the
4372 variable provided by the GNU C Library and declared in <math.h>, without
4373 defining their own copy.
4375 * The minimum GCC version that can be used to build this version of the GNU
4376 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4377 still be used to compile programs using the GNU C Library.
4379 Security related changes:
4381 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4382 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4384 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4385 the pointer guard feature. It is always enabled. Previously,
4386 LD_POINTER_GUARD could be used to disable security hardening in binaries
4387 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4390 * An integer overflow in hcreate and hcreate_r could lead to an
4391 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4393 * The catopen function no longer has unbounded stack usage. Reported by
4394 Max. (CVE-2015-8779)
4396 * The nan, nanf and nanl functions no longer have unbounded stack usage
4397 depending on the length of the string passed as an argument to the
4398 functions. Reported by Joseph Myers. (CVE-2014-9761)
4400 * A stack-based buffer overflow was found in libresolv when invoked from
4401 libnss_dns, allowing specially crafted DNS responses to seize control
4402 of execution flow in the DNS client. The buffer overflow occurs in
4403 the functions send_dg (send datagram) and send_vc (send TCP) for the
4404 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4405 family. The use of AF_UNSPEC triggers the low-level resolver code to
4406 send out two parallel queries for A and AAAA. A mismanagement of the
4407 buffers used for those queries could result in the response of a query
4408 writing beyond the alloca allocated buffer created by
4409 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4410 the overflow. Thanks to the Google Security Team and Red Hat for
4411 reporting the security impact of this issue, and Robert Holiday of
4412 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4414 The following bugs are resolved with this release:
4416 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4417 [887] math: Math library function "logb" and "nextafter" inconsistent
4418 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4419 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4420 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4421 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4423 [4404] localedata: German translation of "Alarm clock" is misleading
4424 [6799] math: nextafter() and nexttoward() doen't set errno on
4425 overflow/underflow errors
4426 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4428 [10432] nis: _nss_nis_setnetgrent assertion failure
4429 [11460] libc: fts has no LFS support
4430 [12926] network: getaddrinfo()/make_request() may spin forever
4431 [13065] nptl: Race condition in pthread barriers
4432 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4433 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4435 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4436 [14912] libc: Rename non-installed bits/*.h headers
4437 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4438 [15367] math: Let gcc use __builtin_isinf
4439 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4440 [15421] math: lgamma wrongly sets signgam for ISO C
4441 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4442 FE_INVALID with argument out of range
4443 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4445 [15786] dynamic-link: ifunc resolver functions can smash function
4447 [15918] math: Unnecessary check for equality in hypotf()
4448 [16061] localedata: Review / update transliteration data
4449 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4451 [16141] time: strptime %z offset restriction
4452 [16171] math: drem should be alias of remainder
4453 [16296] math: fegetround is pure?
4454 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4455 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4457 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4458 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4460 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4461 "Exception "Inexact" set" on ppc32
4462 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4463 [16517] math: Missing underflow exception from tanf/tan/tanl
4464 [16519] math: Missing underflow exception from sinhf
4465 [16520] math: Missing underflow exception from tanhf
4466 [16521] math: Missing underflow exception from exp2
4467 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4469 [16734] stdio: fopen calls mmap to allocate its buffer
4470 [16961] math: nan function incorrect handling of bad sequences
4471 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4472 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4473 [16985] locale: localedef: confusing error message when opening output
4475 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4476 [17197] locale: Redundant shift character in iconv conversion output at
4478 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4479 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4480 [17250] dynamic-link: static linking breaks nss loading
4481 (getaddrinfo/getpwnam/etc...)
4482 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4484 [17441] math: isnan() should use __builtin_isnan() in GCC
4485 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4486 (related to lock elision)
4487 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4488 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4489 [17887] time: strptime should be able to parse "+01:00" style timezones
4490 [17905] libc: catopen() Multiple unbounded stack allocations
4492 [18084] libc: backtrace (..., 0) dumps core on x86
4493 [18086] libc: nice() sets errno to 0 on success
4494 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4495 is too large (CVE-2015-8778)
4496 [18251] dynamic-link: SONAME missing when audit modules provides path
4497 [18265] libc: add attributes for wchar string and memory functions
4498 [18370] math: csqrt missing underflows
4499 [18421] libc: [hppa] read-only segment has dynamic relocations
4500 [18472] libc: Obsolete syscall wrappers should be compat symbols
4501 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4502 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4503 [18525] localedata: Remove locale timezone information
4504 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4505 [18568] localedata: Update locale data to Unicode 8.0
4506 [18589] locale: sort-test.sh fails at random
4507 [18595] math: ctan, ctanh missing underflows
4508 [18604] libc: assert macro-expands its argument
4509 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4510 contains a vector instruction exception.
4511 [18611] math: j1, jn missing errno setting on underflow
4512 [18618] localedata: sync Chechen locale definitions with other *_RU
4514 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4515 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4516 [18665] network: In send_dg, the recvfrom function is NOT always using the
4517 buffer size of a newly created buffer (CVE-2015-7547)
4518 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4520 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4522 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4523 [18699] math: tilegx cproj() for various complex infinities does not yield
4525 [18724] libc: Harden put*ent functions against data injection
4526 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4527 [18755] build: build errors with -DNDEBUG
4528 [18757] stdio: fmemopen fails to set errno on failure
4529 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4531 [18781] libc: openat64 lacks O_LARGEFILE
4532 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4533 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4534 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4535 [18790] math: [ldbl-128ibm] tanhl inaccurate
4536 [18795] libc: stpncpy fortification misses buffer lengths that are
4537 statically too large
4538 [18796] build: build fails for --disable-mathvec
4539 [18803] math: hypot missing underflows
4540 [18820] stdio: fmemopen may leak memory on failure
4541 [18823] math: csqrt spurious underflows
4542 [18824] math: fma spurious underflows
4543 [18825] math: pow missing underflows
4544 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4545 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4546 [18870] build: sem_open.c fails to compile with missing symbol
4548 [18872] stdio: Fix memory leak in printf_positional
4549 [18873] libc: posix_fallocate overflow check ineffective
4550 [18875] math: Excess precision leads incorrect libm
4551 [18877] libc: arm: mmap offset regression
4552 [18887] libc: memory corruption when using getmntent on blank lines
4553 [18918] localedata: hu_HU: change time to HH:MM:SS format
4554 [18921] libc: Regression: extraneous stat() and fstat() performed by
4556 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4557 binaries (CVE-2015-8777)
4558 [18951] math: tgamma missing underflows
4559 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4561 [18953] localedata: lt_LT: change currency symbol to the euro
4562 [18956] math: powf inaccuracy
4563 [18961] math: [i386] exp missing underflows
4564 [18966] math: [i386] exp10 missing underflows
4565 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4566 [18969] build: multiple string test failures due to missing locale
4568 [18970] libc: Reference of pthread_setcancelstate in libc.a
4569 [18977] math: float / long double Bessel functions not in XSI POSIX
4570 [18980] math: i386 libm functions return with excess range and precision
4571 [18981] math: i386 scalb*, ldexp return with excess range and precision
4572 [18982] stdio: va_list and vprintf
4573 [18985] time: Passing out of range data to strftime() causes a segfault
4575 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4576 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4577 [19012] locale: iconv_open leaks memory on error path
4578 [19016] math: clog, clog10 inaccuracy
4579 [19018] nptl: Mangle function pointers in tls_dtor_list
4580 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4581 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4582 [19048] malloc: malloc: arena free list can become cyclic, increasing
4584 [19049] math: [powerpc] erfc incorrect zero sign
4585 [19050] math: [powerpc] log* incorrect zero sign
4586 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4587 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4588 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4589 [19074] network: Data race in _res_hconf_reorder_addrs
4590 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4591 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4592 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4594 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4596 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4597 [19086] manual: posix_fallocate64 documented argument order is wrong.
4598 [19088] math: lround, llround missing exceptions close to overflow
4600 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4601 [19095] math: dbl-64 lrint incorrect for 64-bit long
4602 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4603 [19124] dynamic-link: ld.so failed to build with older assmebler
4604 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4605 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4606 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4607 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4608 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4609 pthread_setaffinity_np
4610 [19156] math: [ldbl-128] j0l spurious underflows
4611 [19164] nptl: tst-getcpu fails with many possible CPUs
4612 [19168] math: math/test-ildoubl and math/test-ldouble failure
4613 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4614 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4616 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4617 (FE_NOMASK_ENV) do not clear SSE exceptions
4618 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4619 _int_new_arena/reused_arena
4620 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4621 [19201] math: dbl-64 remainder incorrect sign of zero result
4622 [19205] math: bits/math-finite.h conditions do not match math.h and
4624 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4625 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4626 for C99-based standards
4627 [19212] libc: features.h not -Wundef clean
4628 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4630 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4631 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4632 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4634 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4635 "inexact" exceptions
4636 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4638 [19242] libc: strtol incorrect in Turkish locales
4639 [19243] malloc: reused_arena can pick an arena on the free list, leading
4640 to an assertion failure and reference count corruption
4641 [19253] time: tzset() ineffective when temporary TZ did not include DST
4643 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4644 [19270] math: [hppa] Shared libm missing __isnanl
4645 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4646 MAP_HUGETLB and MAP_STACK defines
4647 [19313] nptl: Wrong __cpu_mask for x32
4648 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4649 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4650 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4651 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4652 [19363] time: x32: times() return value wrongly truncates/sign extends
4654 [19367] dynamic-link: Improve branch prediction on Silvermont
4655 [19369] network: Default domain name not reset by res_ninit when "search"
4656 / "domain" entry is removed from resolv.conf
4657 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4659 [19385] localedata: bg_BG: time separator should be colon, not comma
4660 [19408] libc: linux personality syscall wrapper may erroneously return an
4661 error on 32-bit architectures
4662 [19415] libc: dladdr returns wrong names on hppa
4663 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4664 IBM905, IBM907, and IBM909
4665 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4666 [19443] build: build failures with -DDEBUG
4667 [19451] build: Make check fails on test-double-vlen2
4668 [19462] libc: Glibc failed to build with -Os
4669 [19465] math: Wrong code with -Os
4670 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4672 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4674 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4675 [19486] math: S390: Math tests fail with "Exception Inexact set".
4676 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4677 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4679 [19590] math: Fail to build shared objects that use libmvec.so functions.
4683 * The following bugs are resolved with this release:
4685 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4686 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4687 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4688 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4689 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4690 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4691 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4692 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4693 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4694 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4695 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4696 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4697 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4698 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4699 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4700 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4701 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4702 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4703 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4704 18657, 18676, 18694, 18696, 18887.
4706 * Cache information can be queried via sysconf() function on s390 e.g. with
4707 _SC_LEVEL1_ICACHE_SIZE as argument.
4709 * A buffer overflow in gethostbyname_r and related functions performing DNS
4710 requests has been fixed. If the NSS functions were called with a
4711 misaligned buffer, the buffer length change due to pointer alignment was
4712 not taken into account. This could result in application crashes or,
4713 potentially arbitrary code execution, using crafted, but syntactically
4714 valid DNS responses. (CVE-2015-1781)
4716 * The time zone file parser has been made more robust against crafted time
4717 zone files, avoiding heap buffer overflows related to the processing of
4718 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4719 large time zone data files. Overly long time zone specifiers in the TZ
4720 variable no longer result in stack overflows and crashes.
4722 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4723 for LD and GD on x86 and x86-64, has been implemented. You will need
4724 binutils-2.24 or later to enable this optimization.
4726 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4727 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4728 Hat). These updates cause user visible changes, such as the fix for bug
4731 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4732 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4733 condition in some applications.
4735 * Added vector math library named libmvec with the following vectorized x86_64
4736 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4738 The library can be disabled with --disable-mathvec. Use of the functions is
4739 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4740 Shared library libmvec.so is linked in as needed when using -lm (no need to
4741 specify -lmvec explicitly for not static builds).
4742 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4744 * A new fmemopen implementation has been added with the goal of POSIX
4745 compliance. The new implementation fixes the following long-standing
4746 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4747 old implementation is still present for use be by existing binaries.
4749 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4750 releases. It has been fixed to match 2.19 and older, but binaries built
4751 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4753 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4754 Contributed by Roland McGrath (Google).
4756 * The header <regexp.h> is deprecated, and will be removed in a future
4757 release. Use of this header will trigger a deprecation warning.
4758 Application developers should update their code to use <regex.h> instead.
4760 This header was formerly part of SUS, but was deprecated in 1994 and
4761 removed from the standard in 2001. Also, the glibc implementation
4762 leaks memory. See BZ#18681 for more details.
4766 * The following bugs are resolved with this release:
4768 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4769 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4770 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4771 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4772 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4773 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4774 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4775 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4776 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4777 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4780 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4781 too little memory for the to-be-scanned arguments and overflow the
4782 allocated buffer. The implementation now correctly computes the required
4783 buffer size when using malloc, and switches to malloc from alloca as
4786 * A new semaphore algorithm has been implemented in generic C code for all
4787 machines. Previous custom assembly implementations of semaphore were
4788 difficult to reason about or ensure that they were safe. The new version
4789 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4790 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4791 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4793 * Port to Altera Nios II has been contributed by Mentor Graphics.
4795 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4796 implementations for powerpc64/powerpc64le.
4797 Implemented by Adhemerval Zanella (IBM).
4799 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4800 and powerpc64le. This may improve lock scaling of existing programs on
4801 HTM capable systems. The lock elision code is only enabled with
4802 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4803 powerpc will issue a transaction abort on every syscall to avoid side
4804 effects being visible outside transactions.
4806 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4807 AArch64. Contributed by ARM Ltd.
4809 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4811 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4812 under certain input conditions resulting in the execution of a shell for
4813 command substitution when the application did not request it. The
4814 implementation now checks WRDE_NOCMD immediately before executing the
4815 shell and returns the error WRDE_CMDSUB as expected.
4817 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4818 processing format strings with a large number of format specifiers.
4820 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4821 infinite loop if the DNS response contained a PTR record of an unexpected
4824 * The minimum GCC version that can be used to build this version of the GNU
4825 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4826 still be used to compile programs using the GNU C Library.
4828 * The GNU C Library is now built with -Werror by default. This can be
4829 disabled by configuring with --disable-werror.
4831 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4833 * The obsolete sigvec function has been removed. This was the original
4834 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4835 programs have been using instead for about 25 years. Of course, ABI
4836 compatibility for old binaries using sigvec remains intact.
4838 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4839 with newer versions of bison.
4841 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4842 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4843 registers overlay two consecutive single-precision registers. MIPS32R2
4844 introduced a new FPU mode (FR=1) where double-precision registers extend the
4845 corresponding single-precision registers which is incompatible with the
4846 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4847 require the use of FR=1 making a transition necessary. New o32 ABI
4848 extensions enable users to migrate over time from the original o32 ABI
4849 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4850 tracks the ABI of any loaded object and verifies that new objects are
4851 compatible. Mode transitions will also be requested as required and
4852 unsupportable objects will be rejected. The ABI checks include both soft and
4853 hard float ABIs for o32, n32 and n64.
4855 GCC 5 with GNU binutils 2.25 onwards:
4856 It is strongly recommended that all o32 system libraries are built using the
4857 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4858 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4859 compiler using --with-fp-32=xx to set this by default.
4863 * The following bugs are resolved with this release:
4865 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4866 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4867 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4868 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4869 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4870 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4871 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4872 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4873 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4874 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4875 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4876 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4877 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4878 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4879 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4881 * Reverted change of ABI data structures for s390 and s390x:
4882 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4883 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4884 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4885 are preserved pointing straight to the same implementation as the old ones.
4886 Given that, new callers will simply provide a too-big buffer to these
4887 functions. Any applications/libraries out there that embed jmp_buf or
4888 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4889 against 2.19 headers will have to rebuilt again. This is necessary in any
4890 case to revert the breakage in their ABI caused by the glibc change.
4892 * Support for file description locks is added to systems running the
4893 Linux kernel. The standard file locking interfaces are extended to
4894 operate on file descriptions, not file descriptors, via the use of
4895 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4896 are associated with an open file instead of a process.
4898 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4900 * The minimum Linux kernel version that this version of the GNU C Library
4901 can be used with is 2.6.32.
4903 * Running the testsuite no longer terminates as soon as a test fails.
4904 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4905 with PASS or FAIL lines for individual tests. A summary of the results is
4906 printed, including a list of failing lists, and "make check" exits with
4907 error status if there were any unexpected failures. "make check
4908 stop-on-test-failure=y" may be used to keep the old behavior.
4910 * The am33 port, which had not worked for several years, has been removed
4913 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4914 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4915 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4916 conflicted with POSIX (support for which was removed in 2.19), the
4917 interfaces those macros enabled remain available when compiling with
4918 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4919 test macros defined.
4921 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4923 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4924 This may improve lock scaling of existing programs on TX capable systems.
4925 The lock elision code is only built with --enable-lock-elision=yes and
4926 then requires a GCC version supporting the TX builtins. With lock elision
4927 default mutexes are elided via __builtin_tbegin, if the cpu supports
4928 transactions. By default lock elision is not enabled and the elision code
4931 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4932 copy the path argument. This allowed programs to cause posix_spawn to
4933 deference a dangling pointer, or use an unexpected pathname argument if
4934 the string was modified after the posix_spawn_file_actions_addopen
4937 * All supported architectures now use the main glibc sysdeps directory
4938 instead of some being in a separate "ports" directory (which was
4939 distributed separately before glibc 2.17).
4941 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4942 On configurations that support it (all Linux configurations), it's now
4943 used regardless of the --enable-add-ons switch to configure. It is no
4944 longer possible to build such configurations without pthreads support.
4946 * Locale names, including those obtained from environment variables (LANG
4947 and the LC_* variables), are more tightly checked for proper syntax.
4948 setlocale will now fail (with EINVAL) for locale names that are overly
4949 long, contain slashes without starting with a slash, or contain ".." path
4950 components. (CVE-2014-0475) Previously, some valid locale names were
4951 silently replaced with the "C" locale when running in AT_SECURE mode
4952 (e.g., in a SUID program). This is no longer necessary because of the
4955 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4956 with application code using Intel MPX instructions. (With all previous
4957 versions, the MPX register state could be clobbered when making calls
4958 into or out of a shared library.) Note that while the new dynamic
4959 linker is compatible with all known x86 hardware whether or not it
4960 supports Intel MPX, some x86 instruction-set emulators might fail to
4961 handle the new instruction encodings. This is known to affect Valgrind
4962 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4963 release), and might affect other tools that do instruction emulation.
4965 * Support for loadable gconv transliteration modules has been removed.
4966 The support for transliteration modules has been non-functional for
4967 over a decade, and the removal is prompted by security defects. The
4968 normal gconv conversion modules are still supported. Transliteration
4969 with //TRANSLIT is still possible, and the //IGNORE specifier
4970 continues to be supported. (CVE-2014-5119)
4972 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4973 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4974 resulting a denial-of-service security vulnerability in applications which
4975 use functions related to iconv. (CVE-2014-6040)
4979 * The following bugs are resolved with this release:
4981 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4982 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4983 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4984 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4985 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4986 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4987 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4988 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4989 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4990 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4991 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4992 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4993 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4994 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4995 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4996 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4997 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4998 16431, 16453, 16474, 16506, 16510, 16529
5000 * Slovenian translations for glibc messages have been contributed by the
5001 Translation Project's Slovenian team of translators.
5003 * The public headers no longer use __unused nor __block. This change is to
5004 support compiling programs that are derived from BSD sources and use
5005 __unused internally, and to support compiling with Clang's -fblock
5006 extension which uses __block.
5008 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5009 large collation sequences to optimize multiple passes. This cache
5010 computation may overflow for large collation sequences and may cause a
5011 stack or buffer overflow. This is now fixed to use a slower algorithm
5012 which does not use a cache if there is an integer overflow.
5014 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5015 rules for large collation sequences to optimize multiple passes and falls
5016 back to alloca if malloc fails, resulting in a possible stack overflow.
5017 The implementation now falls back to an uncached collation sequence lookup
5020 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5021 initialized for static applications resulting in the security feature
5022 being disabled. The pointer guard is now correctly initialized to a
5023 random value for static applications. Existing static applications need
5024 to be recompiled to take advantage of the fix (bug 15754).
5026 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5027 to the d_name member of struct dirent, or omit the terminating NUL
5028 character. (Bugzilla #14699).
5030 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5031 aligned_alloc functions could allocate too few bytes or corrupt the
5032 heap when passed very large allocation size values (Bugzilla #15855,
5035 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5036 for AF_INET6 has been fixed (Bugzilla #16072).
5038 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5039 pap_CW, quz_PE, the_NP.
5041 * Substantially revised locales: gd_GB, ht_HT
5043 * The LC_ADDRESS field was updated to support country_car for almost all
5046 * ISO 1427 definitions were updated.
5048 * ISO 3166 definitions were updated.
5050 * The localedef utility now supports --big-endian and --little-endian
5051 command-line options to generate locales for a different system from that
5052 for which the C library was built.
5054 * Binary locale files now only depend on the endianness of the system for
5055 which they are generated and not on other properties of that system. As a
5056 consequence, binary files generated with new localedef may be incompatible
5057 with old versions of the GNU C Library, and binary files generated with
5058 old localedef may be incompatible with this version of the GNU C Library,
5059 in the following circumstances:
5061 + Locale files may be incompatible on m68k systems.
5063 + Locale archive files (but not separate files for individual locales) may
5064 be incompatible on systems where plain "char" is signed.
5066 * The configure option --disable-versioning has been removed. Builds with
5067 --disable-versioning had not worked for several years.
5069 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5070 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5072 * SystemTap probes for malloc have been introduced.
5074 * SystemTap probes for slow multiple precision fallback paths of
5075 transcendental functions have been introduced.
5077 * Support for powerpc64le has been added.
5079 * The soft-float powerpc port now supports e500 processors.
5081 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5083 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5084 set of header declarations that are enabled by default, even when other
5085 feature test macros or compiler options such as -std=c99 would otherwise
5086 disable some of those declarations.
5088 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5089 conflict with POSIX. The libbsd-compat library (which was a dummy library
5090 that did nothing) has also been removed.
5092 * Preliminary documentation about Multi-Thread, Async-Signal and
5093 Async-Cancel Safety has been added.
5095 * Change of ABI data structures for s390 and s390x:
5096 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5097 allow for future hardware extensions. All library functions that accept or
5098 return these structures were versioned in order to provide backwards
5099 compatibility with existing code. However, not all cases can be handled
5100 with interface versioning. If an application embeds either structure into
5101 another structure and that structure is passed to another compilation unit
5102 which expects the newer larger-sized object then any access to the new
5103 fields will result in undefined behaviour. Similarly any access to fields
5104 that were moved by the enlarging of the structures will cause undefined
5105 behaviour. To fix the undefined behaviour all objects that are part of the
5106 final in-memory image must agree on the size of structures, and this may
5107 require recompilation.
5111 * The following bugs are resolved with this release:
5113 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5114 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5115 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5116 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5117 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5118 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5119 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5120 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5121 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5122 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5123 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5124 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5125 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5128 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5129 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5130 Distributions can re-enable building and using pt_chown via the new configure
5131 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5132 considerable security risks and should only be used if the distribution
5133 understands and accepts the risks.
5135 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5138 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5139 fixed (Bugzilla #15330).
5141 * Add support for calling C++11 thread_local object destructors on thread
5142 and program exit. This needs compiler support for offloading C++11
5143 destructor calls to glibc.
5145 * Improved worst case performance of libm functions with double inputs and
5148 * Support for priority inherited mutexes in pthread condition variables on
5149 non-x86 architectures.
5151 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5153 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5155 * Optimized string functions for ARM. Implemented by Will Newton and
5158 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5160 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5163 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5164 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5166 * Added a benchmark framework to track performance of functions in glibc.
5168 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5169 It is based on draft TS 18661 and currently enabled as a GNU extension.
5171 * On Linux, the clock function now uses the clock_gettime system call
5172 for improved precision, rather than old times system call.
5174 * Added support for version-3 tz format files. This is needed when using
5175 the tz database release 2013e or later, and affects a few unusual cases --
5176 currently only TZ='America/Godthab' for time stamps after 2037.
5178 * Added new API functions pthread_getattr_default_np and
5179 pthread_setattr_default_np to get and set the default pthread
5180 attributes of a process.
5182 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5183 This may improve lock scaling of existing programs on TSX capable systems.
5184 When the --enable-lock-elision=yes parameter is specified at configure
5185 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5188 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5189 availability). Implemented by Ryan S. Arnold.
5191 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5195 * The following bugs are resolved with this release:
5197 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5198 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5199 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5200 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5201 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5202 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5203 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5204 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5205 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5206 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5207 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5208 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5209 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5210 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5211 14879, 14889, 14893, 14898, 14914.
5213 * Optimization of memcpy for MIPS.
5215 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5216 EMFILE has been fixed (Bugzilla #14889).
5218 * The add-on ports collection is now distributed in the "ports" subdirectory
5219 of the main GNU C Library distribution, rather than separately.
5221 * Port to ARM AArch64 contributed by Linaro.
5223 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5224 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5226 Implemented by Andreas Krebbel.
5228 * The new function secure_getenv allows secure access to the environment,
5229 returning NULL if running in a SUID/SGID process. This function replaces
5230 the internal function __secure_getenv.
5232 * SystemTap static probes have been added into the dynamic linker.
5233 Implemented by Gary Benson.
5235 * Optimizations of string functions strstr, strcasestr and memmem.
5236 Implemented by Maxim Kuvyrkov.
5238 * The minimum Linux kernel version that this version of the GNU C Library
5239 can be used with is 2.6.16.
5241 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5242 powerpc POWER7. Implemented by Will Schmidt.
5244 * New configure option --disable-nscd builds the C library such that it
5245 never attempts to contact the Name Service Caching Daemon (nscd).
5246 New configure option --disable-build-nscd avoids building nscd itself;
5247 this is the default if --disable-nscd is used.
5249 * Improved support for cross-compilation, including cross-testing and
5250 bootstrap builds without a previously built glibc.
5252 * Several testsuite tests are now able to test multiple IFUNC variants of an
5253 interface, rather than just testing the one that would be chooen by
5256 * New configure options --with-bugurl and --with-pkgversion, for
5257 distributors to use to embed their bug-reporting and package version
5258 information in --help and --version output.
5260 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5261 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5262 allows creation of chroots without the procfs mounted on /proc.
5264 * The `crypt' function now fails if passed salt bytes that violate the
5265 specification for those values. On Linux, the `crypt' function will
5266 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5267 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5268 when the mode is enabled.
5270 * The `clock_*' suite of functions (declared in <time.h>) is now available
5271 directly in the main C library. Previously it was necessary to link with
5272 -lrt to use these functions. This change has the effect that a
5273 single-threaded program that uses a function such as `clock_gettime' (and
5274 is not linked with -lrt) will no longer implicitly load the pthreads
5275 library at runtime and so will not suffer the overheads associated with
5276 multi-thread support in other code such as the C++ runtime library.
5278 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5283 * The following bugs are resolved with this release:
5285 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5286 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5287 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5288 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5289 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5290 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5291 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5292 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5293 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5294 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5295 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5296 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5297 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5298 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5299 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5300 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5301 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5302 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5303 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5304 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5305 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5306 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5309 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5310 configuring glibc with:
5311 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5312 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5313 Implemented by H.J. Lu.
5317 + define static_assert
5319 + do not declare gets
5321 + declare at_quick_exit and quick_exit also for ISO C11
5323 + aligned_alloc. NB: The code is deliberately allows the size parameter
5324 to not be a multiple of the alignment. This is a moronic requirement
5325 in the standard but it is only a requirement on the caller, not the
5328 + timespec_get added
5330 + uchar.h support added
5332 + CMPLX, CMPLXF, CMPLXL added
5334 Implemented by Ulrich Drepper.
5336 * Support for the IA-64 has been moved to ports.
5338 * Remove support for anything but ELF binary format
5340 * Checking versions of poll, ppoll added.
5341 Implemented by Ulrich Drepper.
5343 * More generic and 64-bit performance optimizations to math functions.
5344 Implemented by Ulrich Drepper.
5346 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5347 headers and functions available at compile time as they were before
5348 version 2.14. This option will be removed at some time in the future
5349 after the TI-RPC library becomes fully sufficient for the needs of
5350 existing applications.
5352 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5353 Note that glibc is not expected to work with any Linux kernel version
5356 * New header <sys/auxv.h> and function getauxval allowing easy access to
5357 the AT_* key-value pairs passed from the Linux kernel. The header also
5358 defines the HWCAP_* bits associated with the AT_HWCAP key.
5360 * New locales: mag_IN
5362 * New configure option --enable-systemtap builds SystemTap static probes
5363 into libc for setjmp and longjmp and into libpthread for various operations.
5364 So far the setjmp/longjmp probes and some of the libpthread probes are
5365 provided only for i*86 and x86_64.
5366 Implemented by Roland McGrath and Rayson Ho.
5368 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5370 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5373 * More optimized functions for SPARC. Implemented by David S. Miller.
5375 * Improved support for cross-compilation, especially bootstrap builds
5376 without a previously built glibc.
5378 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5379 Chris Metcalf from Tilera.
5381 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5382 now supported for ARM processors.
5384 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5385 as the name of the dynamic linker, to distinguish it from the
5386 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5388 * Support for CRIS has been removed from ports.
5390 * A new class of installed header has been documented for low-level
5391 platform-specific functionality. PowerPC added the first instance with a
5392 function to provide time base register access. Contributed by Tulio
5393 Magno Quites Machado Filho.
5395 * ix86 configurations now install header files that are consistent with
5396 what x86-64 configurations install. These same header files can be used
5397 for -m32, -m64, or -mx32 builds.
5398 Contributed by H.J. Lu.
5400 * Math library bug fixes. A thorough audit of all open math library bugs was
5401 conducted by Joseph Myers. Significant progress was made on many math
5402 library bugs resulting in more accurate exceptions and function results.
5403 Many thanks to all those that contributed including Andreas Jaeger for his
5404 patch review and work on the x87 trigonometric instruction issues.
5406 * Timezone data is no longer installed. Timezone-related binaries and scripts
5407 will continue to be installed. Users should obtain their timezone data from
5408 their distribution provider or from the tzdata package at
5409 <ftp://munnari.oz.au/pub/>.
5413 * The following bugs are resolved with this release:
5415 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5416 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5417 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5418 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5419 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5420 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5421 13484, 13506, 13515, 13523, 13524, 13538, 13540
5423 * New program pldd to list loaded object of a process
5424 Implemented by Ulrich Drepper.
5426 * Add nss_db support back to glibc. No more dependency on Berkeley db
5427 and support for initgroups lookups.
5428 Implemented by Ulrich Drepper.
5430 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5431 Contributed by HJ Lu.
5433 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5434 Contributed by HJ Lu.
5436 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5437 on x86-32 and x86-64.
5438 Contributed by Liubov Dmitrieva.
5440 * Optimized strchr and strrchr for SSE on x86-32.
5441 Contributed by Liubov Dmitrieva.
5443 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5444 for x86-64 and x86-32.
5445 Contributed by Liubov Dmitrieva.
5447 * New interfaces: scandirat, scandirat64
5448 Implemented by Ulrich Drepper.
5450 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5451 Implemented by Ulrich Drepper.
5453 * nscd now also caches the netgroup database.
5454 Implemented by Ulrich Drepper.
5456 * Integrate libm with gcc's -ffinite-math-only option.
5457 Implemented by Ulrich Drepper.
5459 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5460 to math functions. Implemented by Ulrich Drepper.
5462 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5463 Implemented by Ulrich Drepper.
5465 * New Linux interfaces: process_vm_readv, process_vm_writev
5467 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5468 Implemented by Ulrich Drepper.
5470 * Optimized nearbyint and strcasecmp for PPC.
5471 Implemented by Adhemerval Zanella.
5473 * New locales: bho_IN, unm_US, es_CU, ta_LK
5477 * The following bugs are resolved with this release:
5479 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5480 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5481 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5482 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5483 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5484 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5485 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5486 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5487 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5488 12795, 12811, 12813, 12814, 12841
5490 * The RPC implementation in libc is obsoleted. Old programs keep working
5491 but new programs cannot be linked with the routines in libc anymore.
5492 Programs in need of RPC functionality must be linked against TI-RPC.
5493 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5495 Visible changes of this change include (obviously) the inability to link
5496 programs using RPC functions without referencing the TI-RPC library and the
5497 removal of the RPC headers from the glibc headers.
5498 Implemented by Ulrich Drepper.
5500 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5501 syncfs, setns, sendmmsg
5503 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5504 yue_HK, lij_IT, mhr_RU
5506 * New encodings: CP770, CP771, CP772, CP773, CP774
5508 * New program sotruss to trace calls through PLTs
5509 Implemented by Ulrich Drepper.
5511 * The malloc hook implementation is marked deprecated and will be removed
5512 from the default implementation in the next version. The design never
5513 worked ever since the introduction of threads. Even programs which do
5514 not create threads themselves can use multiple threads created internally.
5518 * The following bugs are resolved with this release:
5520 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5521 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5522 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5523 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5526 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5528 * POWER7 optimizations: memset, memcmp, strncmp
5530 * New optimized string functions for x86-64: strnlen (SSE2),
5531 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5532 Implemented by Ulrich Drepper.
5536 * The following bugs are resolved with this release:
5538 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5539 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5540 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5541 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5542 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5543 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5544 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5545 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5547 * New interfaces: pthread_getname_np, pthread_setname_np
5549 * New Linux interface: recvmmsg
5551 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5553 * The dynamic linker now recognizes supported ABI versions from the
5554 EI_ABIVERSION field in the ELF header.
5555 Implemented by Ulrich Drepper.
5557 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5558 will not be used to fill in password fields in the passwd.byname replies.
5559 Instead it is used to synthesize the shadow.byname table, should it be
5560 missing. This is a useful mode in some installations involving Solaris.
5561 Implemented by Ulrich Drepper.
5563 * New locales: kok_IN, sq_MK, cv_RU
5567 * The following bugs are resolved with this release:
5569 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5570 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5571 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5572 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5573 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5574 10789, 10817, 10823, 10840, 10847
5576 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5578 Implemented by Ulrich Drepper.
5580 * Checking version of longjmp added that fails if an uninitialized stack
5581 frame would be created. Implemented by Ulrich Drepper.
5583 * STT_GNU_IFUNC is now supported in static executables.
5584 Implemented by H.J. Lu.
5586 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5588 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5589 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5590 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5591 Contributed by H.J. Lu.
5593 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5594 Implemented by Ulrich Drepper.
5596 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5598 Contributed by H.J. Lu.
5600 * Support for fma instruction in AVX on x86-64.
5601 Implemented by H.J. Lu and Ulrich Drepper.
5603 * AVX support in x86-64 auditing support in ld.so.
5604 Implemented by H.J. Lu.
5606 * STB_GNU_UNIQUE support added.
5607 Implemented by Ulrich Drepper.
5609 * Implement second fallback mode for optimized DNS lookup for even more
5610 broken environments. If two requests from the same port are not
5611 handled correctly close the socket and open a new one before sending
5612 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5613 can be used to select this mode right away, instead of rediscovering the
5614 necessity is every process again.
5615 Implemented by Ulrich Drepper.
5617 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5618 Implemented by Adam Tkac.
5620 * Optimized iconv conversions for S390x.
5621 Implemented by Andreas Krebbel.
5623 * Using condvars with PI mutexes is now more efficient due to kernel
5624 support for requeueing to PI futexes. NPTL support added for x86-64.
5625 Implemented by Ulrich Drepper.
5627 * New locales: ps_AF, my_MM
5631 * The following bugs are resolved with this release:
5633 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5634 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5635 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5636 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5637 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5639 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5640 Implemented by Ulrich Drepper.
5642 * New Linux interfaces: accept4, fallocate, fallocate64.
5643 Implemented by Ulrich Drepper.
5645 * Correct declarations of string function when used in C++ code. This
5646 could lead to compile errors for invalid C++ code.
5648 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5651 * New POSIX 2008 interface: psiginfo
5652 Implemented by Ulrich Drepper.
5654 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5655 Implemented by Ulrich Drepper.
5657 * Support for selecting between multiple function definitions at runtime
5658 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5660 * The libcrypt library can now use the hash function implementations in
5661 NSS. Implemented by Ulrich Drepper.
5663 * The malloc implementation can be compiled to be less memory efficient
5664 but higher performing in multi-threaded programs.
5665 Implemented by Ulrich Drepper.
5667 * New locales: nan_TW@latin, ks_IN
5669 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5670 Implemented by Ulrich Drepper.
5672 * Extended printf hook support. It is possible to use user-defined types
5673 and extend existing format specifiers.
5674 Implemented by Ulrich Drepper.
5676 * Handling for group shadow files has been added.
5677 Implemented by Ulrich Drepper.
5679 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5680 servers (the case, e.g., for some people using the built-in DNS
5681 server in ADSL modems/routers). There is a once-per-process timeout
5682 in case of a broken server. To avoid it, users can run nscd or put
5683 'options single-request' in /etc/resolv.conf.
5684 Implemented by Ulrich Drepper.
5688 * The following bugs are resolved with this release:
5690 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5691 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5692 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5693 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5694 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5696 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5697 up at the same time. Implemented by Ulrich Drepper.
5699 * TLS descriptors for LD and GD on x86 and x86-64.
5700 Implemented by Alexandre Oliva.
5702 * getaddrinfo now handles DCCP and UDPlite.
5703 Implemented by Ulrich Drepper.
5705 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5706 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5707 Implemented by Ulrich Drepper.
5709 * New implementation of memmem, strstr, and strcasestr which is O(n).
5710 Implemented by Eric Blake.
5712 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5714 * Implement "e" option for popen to open file descriptor with the
5715 close-on-exec flag set. Implemented by Ulrich Drepper.
5717 * Implement "b" mode for fmemopen. In this mode writes writes don't
5718 implicitly add a NUL byte and seeks from the end of the buffer really
5719 use the buffer end, not the string length as the basis.
5720 Implemented by Ulrich Drepper.
5722 * Many functions, exported and internal, now atomically set the close-on-exec
5723 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5725 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5727 Implemented by Pravin Satpute.
5729 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5733 * The following bugs are resolved with this release:
5735 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5736 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5737 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5738 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5739 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5740 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5741 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5743 * New locales: bo_CN, bo_IN, shs_CA.
5745 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5747 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5748 Implemented by Pravin Satpute.
5750 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5752 * nscd caches now all timeouts for DNS entries
5753 Implemented by Ulrich Drepper.
5755 * nscd is more efficient and wakes up less often.
5756 Implemented by Ulrich Drepper.
5758 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5759 vdprintf, and obstack_vprintf.
5760 Implemented by Jakub Jelinek.
5762 * Faster memset for x86-64.
5763 Implemented by Harsha Jagasia and H.J. Lu.
5765 * Faster memcpy on x86.
5766 Implemented by Ulrich Drepper.
5768 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5769 Implemented by Ulrich Drepper.
5771 * Faster sqrt and sqrtf implemention for some PPC variants.
5772 Implemented by Steven Munroe.
5776 * The following bugs are resolved with this release:
5778 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5779 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5780 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5781 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5782 5071, 5103, 5104, 5112, 5113, 5184, 5186
5784 * More checking functions: fread, fread_unlocked, open*, mq_open.
5785 Implemented by Jakub Jelinek and Ulrich Drepper.
5787 * Extend fortification to C++. Implemented by Jakub Jelinek.
5789 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5790 by not recognizing 'a' as a modifier when those specs are requested.
5791 Implemented by Jakub Jelinek.
5793 * PPC optimizations to math and string functions.
5794 Implemented by Steven Munroe.
5796 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5797 options to be passed. Implemented by Ulrich Drepper.
5799 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5801 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5802 Implemented by Ulrich Drepper.
5804 * Handle private futexes in the NPTL implementation.
5805 Implemented by Jakub Jelinek and Ulrich Drepper.
5807 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5808 Implemented by Roland McGrath and Ulrich Drepper.
5810 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5812 * SHA-256 and SHA-512 based password encryption.
5813 Implemented by Ulrich Drepper.
5815 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5816 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5819 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5820 Implemented by Ulrich Drepper.
5824 * The following bugs are resolved with this release:
5826 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5827 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5828 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5829 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5830 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5831 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5832 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5835 * New Linux interfaces: epoll_pwait, sched_getcpu.
5837 * New generic interfaces: strerror_l.
5839 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5843 * The following bugs are resolved with this release:
5845 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5846 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5847 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5848 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5849 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5850 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5851 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5852 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5853 3225, 3251, 3252, 3253, 3273
5855 * For Linux, the sorting of addresses returned by getaddrinfo now also
5856 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5857 Implemented by Ulrich Drepper.
5859 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5860 Implemented by Ulrich Drepper.
5862 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5864 * New iconv module for MIK. Contributed by Alexander Shopov.
5866 * For sites with broken group and/or passwd database, the auto-propagate
5867 option of nscd can prevent creating ID lookup entries from the results
5868 of a name lookup and vice versa. This usually is no problem but some
5869 site might have problems with the default behavior.
5870 Implemented by Ulrich Drepper.
5872 * Iterating over entire database in NIS can be slow. With the
5873 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5874 to trade time for memory. The entire database will be read at once.
5875 Implemented by Ulrich Drepper.
5877 * The interfaces introduced in RFC 3542 have been implemented by
5880 * Support for the new ELF hash table format was added by Ulrich Drepper.
5882 * Support for priority inheritance mutexes added by Jakub Jelinek and
5885 * Support for priority protected mutexes added by Jakub Jelinek.
5887 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5888 or_IN, csb_PL, fy_NL, sr_ME.
5892 * More overflow detection functions.
5894 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5895 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5897 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5898 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5899 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5900 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5901 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5902 by Masahide Washizawa.
5904 * It is now possible to install audit libraries for the dynamic linker using
5905 LD_AUDIT. Implemented by Ulrich Drepper.
5907 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5908 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5909 For a libc and libpthread that works well on Linux 2.4 kernels, we
5910 recommend using the stable 2.3 branch.
5912 * The new function open_wmemstream acts like open_memstream,
5913 but uses a wchar_t wide character buffer.
5915 * The new function ppoll is an improved version of poll, similar to pselect.
5917 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5918 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5919 renameat, unlinkat, linkat, symlinkat, readlinkat.
5921 * New Linux kernel system calls: unshare,
5922 inotify_init, inotify_add_watch, inotify_rm_watch.
5924 * The euidaccess function is now also known by the alias eaccess,
5925 for compatibility with some other systems.
5927 * Timezone data updated to 2006b version.
5931 * The following bugs are resolved with this release:
5933 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5934 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5935 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5936 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5937 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5938 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5940 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5942 * As of this release, GCC 4 can be used to compile the C Library.
5944 * Timezone data updated to 2005m version.
5948 * The following bugs are resolved with this release:
5950 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5951 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5952 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5953 777, 787, 821, 822, 823, 825
5955 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5959 * Support for RFC 3678. Real implementations exist only for Linux so far.
5960 Implemented by Ulrich Drepper.
5962 * nscd can now cache entries persistently. Expiring entries are reloaded.
5963 For speedups the cache can be shared in memory with client processes.
5964 Implemented by Ulrich Drepper.
5966 * nscd can now perform SELinux checks.
5967 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5969 * getaddrinfo queries are now cached. Canonical name lookup is performed
5971 Implemented by Ulrich Drepper.
5973 * The nothrow function attribute is used when headers are used by gcc when
5974 compiling C code. This can avoid significant amounts of exception
5977 * The malloc functions perform more error checking and are stricter when
5978 it comes to reacting on errors. The default action is to terminate
5979 the process after showing an error message. Implemented by Ulrich Drepper.
5981 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5982 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5984 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5985 namespaces using the new function dlmopen(). This feature is of course,
5986 like most other dynamic loading functionality, not available in statically
5987 linked applications. Implemented by Ulrich Drepper.
5989 * Low-overhead boundary checking variants of string and some stdio functions
5990 were added. These are to be used in conjunction with a gcc patch by
5991 Jakub Jelinek which adds calls to these functions if possible.
5992 Implemented by Jakub Jelinek and Ulrich Drepper.
5994 * Old code for several operating systems and machine architectures that
5995 have not been in working condition in a long time have been removed from
5996 the main source tree maintained by the GNU C Library's maintainers.
5997 These files are now reside in the separate `ports' source module
5998 that is usable as an add-on when building the library.
6002 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6003 interrogate the dynamic linker, compatible with the Solaris interface.
6005 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6006 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6008 * getifaddrs now uses the netlink interface on Linux to get its information.
6009 Implemented by Thorsten Kukuk.
6011 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6012 Implemented by Ulrich Drepper.
6014 * support for non-executable stacks on x86 has been added. Changes mostly
6017 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6020 * getaddrinfo now performs destination address selection according to
6025 * Thread-safe interfaces for many functions that access locale data
6026 were added in version 2.3, but these features were omitted from NEWS.
6027 Many functions have variants with an `_l' suffix that take a `locale_t'
6028 object as a parameter rather than consulting the current locale.
6029 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6030 create and maintain `locale_t' objects. Additionally, the new function
6031 `uselocale' sets "the current locale" (as used by functions not so
6032 parameterized) set for an individual thread. These features were added
6033 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6035 * The functions getresuid, getresgid, setresuid, and setresgid, which
6036 have long been available on Linux, are now declared in <unistd.h>
6037 and are now also available on the Hurd.
6039 * ELF thread-local storage support (TLS) now works on x86-64.
6041 * The new dynamic string token $LIB is expanded in shared library names.
6042 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6044 * Aldy Hernandez contributed complete software floating point support for
6045 PowerPC machines with no FPU.
6047 * fexecve is implemented on Linux.
6049 * The `btowc' function should work at least twice as fast due to
6050 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6052 * With approriate thread add-ons cancelable functions are now implemented
6053 in libc.so as well. No need to call the function in libpthread. This
6054 change allowed to finally disable the incorrect and expensive handling
6055 of weak definition in ld.so.
6057 * Yet more PLT entries in libc.so have been removed. We finally arrived
6058 at the bare minimum. Startup times improved appropriately.
6060 * Support for the new Linux/x86 system call interface was added. The
6061 AT_SYSINFO auxiliary vector entry is recognized and handled.
6065 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6068 * iconv (the program and the interface) now accepts empty names (excluding
6069 options like //TRANSLIT) to mean "use charset of current locale".
6071 * localedef can now transliterate characters in strings which are not in
6072 the provided charmap. The information from the input locale is used.
6074 * Prelinking support was added for ELF targets. This requires additional
6075 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6077 * Read-only stdio streams now use mmap to speed up operation by eliminating
6078 copying and buffer underflows. To use add 'm' to the mode string of
6079 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6081 * The malloc functions were completely rewritten by Wolfram Gloger based
6082 on Doug Lea's malloc-2.7.0.c.
6084 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6085 implementation of regex.
6087 * Bruno Haible upgraded the iconv and locale implementation to support
6090 * Contents of the LC_* and LANG environment variables in the CEN style are
6091 not recognized anymore. It never was used. Change by Ulrich Drepper.
6093 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6094 thread-local storage (TLS) ABI on some platforms.
6095 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6097 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6098 EUC-JISX0213, and TSCII.
6100 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6101 BSD-compatible interface for getting all network interface addresses.
6102 Implementation for IPv4 by Roland McGrath.
6104 * Loading of locale data is faster due to the introduction of a locale
6105 archive. Implemented by Roland McGrath and Ulrich Drepper.
6107 * Startup times are significantly reduced by not using exported functions
6108 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6111 * Steven Munroe contributed a port to PowerPC64/Linux.
6115 * The Hurd now uses the GNU libio implementation of stdio rather than the
6116 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6118 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6119 with the same behavior as the Linux system call of the same name.
6123 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6124 128-bit long double format.
6126 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6127 IBM1161, and IBM1162 charsets.
6129 * Andreas Jaeger contributed a port to x86-64/Linux.
6131 * Peter Bruin contributed a port to PowerPC/Hurd.
6133 * libc functions using I/O streams now can handle wide-oriented streams
6136 * optimizations in the dynamic linker. Binaries created by recent binutils
6137 versions start up quicker due to reduced time spent on relocations.
6139 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6143 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6144 asinh, atanh, j0 for the 128-bit long double format.
6146 * Bruno Haible updated all the code handling Unicode in some form to
6147 support Unicode 3.1.
6149 * Speed of regex for single-byte locales is back to previous levels.
6150 Patch by Isamu Hasegawa.
6152 * Alpha, SPARC, and IA-64 now also using floating stacks.
6154 * Startup time of internationalized applications greatly improved through
6155 iconv cache. Use iconvconfig to generate the cache file.
6156 Contributed by Ulrich Drepper.
6158 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6159 severe performance problems. Patch by David Mosberger.
6161 * The Hurd port got a lot more functionality like AIO, various stdio
6162 extensions, etc. Mainly done by Roland McGrath.
6164 * mtrace can now lookup symbols in shared libraries.
6168 * Intel's IA-64 math library is largely integrated. It provides fast and
6169 accurate implementatations for most basic and standard math functions
6170 in float, double, and long double format.
6172 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6173 and asin for the 96-bit long double format and asin, log, tan for the
6174 128-bit long double format.
6176 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6177 The basic double functions exist today. Contributed by Abraham Ziv
6178 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6179 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6181 * An asynchronous name lookup library was added. The interface is designed
6182 after POSIX AIO. The proposal was circulated beforehand to get comments.
6183 No negative ones came in. Implemented by Ulrich Drepper.
6185 * Port to S390/64bit contributed by Martin Schwidefsky
6186 <schwidefsky@de.ibm.com>.
6188 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6189 of functions for Linux/IA-64.
6191 * The RPC code is now thread safe. Threads can now use the same service
6192 of different services at the same time. Patch by Eric Norum
6193 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6195 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6196 family of functions for Linux/S390.
6198 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6199 of functions for Linux/x86.
6201 * Port to Linux/CRIS contributed by Axis Communications.
6205 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6206 we can now check for namespace violations and missing declarations. The
6207 result is that almost all headers are now Unix-compliant (as defined in
6208 the upcoming XPG6). The negative side is that some programs might need
6209 corrections, too, if they depend on the incorrect form of the headers in
6210 previous versions which defined too many symbols and included too many
6213 * regex now handles multibyte character sets correctly.
6214 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6216 * iconv (the program) does now conform to the upcoming XPG6 and handles
6217 charmaps. Instead of the charset names the path of charmaps can be
6218 provided and the conversion happens based on this data.
6219 Contributed by Ulrich Drepper.
6221 * The locale program now provides detailed information about the installed
6226 only lists the names of the supported locales
6230 provides details such as country, language, and codeset name.
6231 Contributed by Ulrich Drepper.
6235 * The gencat program now parses the input file according to the charset
6236 selected by the LC_CTYPE category. This is important for stateful
6237 character sets. To make generating catalogs easier there is a way
6238 to overwrite the charset selected by the locale: before the first
6239 message or $ quote line the catalog can contain a line like
6241 $ codeset=ISO-8859-2
6243 to select the charset (ISO-8859-2 in this case).
6245 Implemented by Shinya Hanataka and Ulrich Drepper.
6247 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6248 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6249 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6251 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6252 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6254 * The LANGUAGE environment variable is now ignored unless the locale is
6255 changed from the default "C" locale.
6257 * The usual bug fixes.
6261 * Greg McGary added runtime support for bounds checking using gcc's
6262 new -fbounded-pointers option. ix86 target is complete. PowerPC
6265 * Thorsten Kukuk added secure mode support to nscd.
6267 * The Berkeley db libraries have been removed.
6269 Related, the nss_db module is now in a separate package since it
6270 obviously requires a database library being available.
6272 * Wide character I/O streams implemented by Ulrich Drepper.
6274 * Functions from the extended socket API added by Ulrich Drepper.
6276 * Functions feenableexcept and fedisableexcept to control the
6277 behaviour of individual exceptions have been added by Andreas Jaeger.
6279 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6281 * The resolver code has been updated from bind 8.2.3-T5B which supports
6282 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6285 This change could in some situations effect backward compatibility. Since
6286 now `_res' is a thread-local instead of a global variable, modifying it
6287 in one thread does not have any effect in other threads.
6289 The resolver library was also extended to allow IPv6 as the transport
6290 protocol for the requests. This work was done by Stig Venaas.
6292 * Compatibility code for K&R C compilers has been removed from the
6293 header files. A ISO C compiler is needed to use the library
6294 (conforming to either C89 or C99 standard).
6296 * Complete rewrite of the localedef program to support multibyte character
6297 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6298 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6299 Implemented by Ulrich Drepper.
6301 Bruno Haible significantly improved the generation and use of the data
6302 structures for the wide character tables.
6304 * Plural handling in gettext implemented by Ulrich Drepper.
6306 * The utmp daemon has been removed.
6308 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6310 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6313 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6315 * POSIX barriers implemented by Kaz Kylheku.
6317 * POSIX spawn function family implemented by Ulrich Drepper.
6319 * POSIX spinlocks are now available.
6321 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6323 * the configure option --enable-kernel=X.Y.Z allows to strip out
6324 compatibility for kernel versions before X.Y.Z. This is currently only
6325 implemented for Linux.
6327 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6328 field sin6_scope_id. This means that all programs using IPv6 should be
6329 recompiled. Don't expect binary compatibility with previous glibc
6332 * various conversion modules for IBM character sets contributed by
6335 * IA-64 port by Jes Sorensen and HJ Lu.
6349 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6351 * New xdr functions are added; some rpc functions are now 64bit clean.
6353 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6355 * Fixed known incompatibilities with glibc 2.0.
6357 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6359 * Optimized a number of functions (especially the ELF dynamic loader).
6361 * Update timezone data files.
6363 * lots of charmaps corrections
6365 * some new locale definitions and charmaps
6370 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6371 conform to POSIX member type requirements. Symbol versions have been
6372 adjusted as needed within the library, and for direct use by applications,
6373 but there is potential for problems if third-party libraries use
6374 struct timeval as part of their interface. This does not present
6375 a problem for X and other "essential" system libraries.
6377 * An additional locale model to support C++ Standard Library locale
6378 model and probably more was implemented by Ulrich Drepper.
6380 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6383 * Miles Bader provided the `argp' function family to support hierachical
6384 command line argument parsing, layered on top of getopt.
6386 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6388 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6391 * scanf recognizes the %a and %A format for scanning floating point numbers.
6393 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6394 information and interfaces for the available integer types.
6396 * about 130 new math functions were added to implement the ISO C9x math
6399 * the new header <complex.h> contains definitions of the complex math
6400 functions from ISO C 9X.
6402 * the new header <tgmath.h> defines generic macros to use complex or
6403 real valued functions.
6405 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6407 * Andreas Jaeger provided a test suite for the math library.
6409 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6411 * Ulrich Drepper added character set conversion functions (iconv).
6413 * Optimized string functions have been added.
6415 * The localedata addon is now part of glibc.
6417 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6419 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6420 daemon for NSS (nscd).
6422 Missing a better place here are some numbers on improvements. Under
6423 Linux 2.1.125 un-tar-ing the kernel sources takes
6427 using local files 12.19s 6.88s 22.91s
6429 using NIS 13.92s 8.91s 26.34s
6431 using NIS & nscd 10.37s 7.34s 25.30s
6433 using NIS+ 27.57s 30.37s 640.46s
6435 using NIS+ & nscd 10.25s 7.83s 26.51s
6437 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6439 Keep in mind that non-namelookup related operations dominate above times.
6440 It was just a common complain that using NIS+ unpacking the kernel is
6443 [1] The old nscd implementation is not available anymore since it was
6444 distributed with glibc up to version 2.0.98 and thus is now replaced.
6446 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6448 * Mark Kettenis provided a Hesiod NSS module.
6450 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6451 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6453 * rcmd can now handle netgroups (Dick Streefland).
6455 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6458 * Support for the IPv6 protocol has been added to the socket API, as per the
6459 latest draft standards.
6461 * Support for Linux 2.2 has been added.
6463 * Interface changes relative to the latest 2.0.x release:
6464 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6465 addseverity NEW: Unix98
6466 alphasort64 NEW: LFS
6467 argp_err_exit_status NEW: argp, GNU ext
6468 argp_error NEW: argp, GNU ext
6469 argp_failure NEW: argp, GNU ext
6470 argp_help NEW: argp, GNU ext
6471 argp_parse NEW: argp, GNU ext
6472 argp_program_bug_address NEW: argp, GNU ext
6473 argp_program_version NEW: argp, GNU ext
6474 argp_program_version_hook NEW: argp, GNU ext
6475 argp_state_help NEW: argp, GNU ext
6476 argp_usage NEW: argp, GNU ext
6477 authdes_create NEW: Secure RPC
6478 authdes_getucred NEW: Secure RPC
6479 authdes_pk_create NEW: Secure RPC
6480 backtrace NEW: GNU ext.
6481 backtrace_symbols NEW: GNU ext.
6482 backtrace_symbols_fd NEW: GNU ext.
6484 cacosf NEW: ISO C 9x
6485 cacosh NEW: ISO C 9x
6486 cacoshf NEW: ISO C 9x
6487 cacoshl NEW: ISO C 9x
6488 cacosl NEW: ISO C 9x
6495 casinf NEW: ISO C 9x
6496 casinh NEW: ISO C 9x
6497 casinhf NEW: ISO C 9x
6498 casinhl NEW: ISO C 9x
6499 casinl NEW: ISO C 9x
6501 catanf NEW: ISO C 9x
6502 catanh NEW: ISO C 9x
6503 catanhf NEW: ISO C 9x
6504 catanhl NEW: ISO C 9x
6505 catanl NEW: ISO C 9x
6506 cbc_crypt NEW: Secure RPC
6510 ccoshf NEW: ISO C 9x
6511 ccoshl NEW: ISO C 9x
6517 cimagf NEW: ISO C 9x
6518 cimagl NEW: ISO C 9x
6519 clearerr_locked REMOVED
6520 clntunix_create NEW: sunrpc ext
6522 clog10 NEW: ISO C 9x
6523 clog10f NEW: ISO C 9x
6524 clog10l NEW: ISO C 9x
6534 cprojf NEW: ISO C 9x
6535 cprojl NEW: ISO C 9x
6537 crealf NEW: ISO C 9x
6538 creall NEW: ISO C 9x
6543 csinhf NEW: ISO C 9x
6544 csinhl NEW: ISO C 9x
6547 csqrtf NEW: ISO C 9x
6548 csqrtl NEW: ISO C 9x
6552 ctanhf NEW: ISO C 9x
6553 ctanhl NEW: ISO C 9x
6555 des_setparity NEW: Secure RPC
6556 ecb_crypt NEW: Secure RPC
6557 endutxent NEW: Unix98
6559 exp10f NEW: ISO C 9x
6560 exp10l NEW: ISO C 9x
6564 fattach NEW: STREAMS
6565 fdetach NEW: STREAMS
6569 feclearexcept NEW: ISO C 9x
6570 fegetenv NEW: ISO C 9x
6571 fegetexceptflag NEW: ISO C 9x
6572 fegetround NEW: ISO C 9x
6573 feholdexcept NEW: ISO C 9x
6575 feraiseexcept NEW: ISO C 9x
6576 ferror_locked REMOVED
6577 fesetenv NEW: ISO C 9x
6578 fesetexceptflag NEW: ISO C 9x
6579 fesetround NEW: ISO C 9x
6580 fetestexcept NEW: ISO C 9x
6581 feupdateenv NEW: ISO C 9x
6582 fflush_locked REMOVED
6586 fgets_unlocked NEW: GNU ext.
6587 fileno_locked REMOVED
6599 fputc_locked REMOVED
6600 fputs_unlocked NEW: GNU ext.
6601 fread_unlocked NEW: GNU ext.
6606 fstatvfs NEW: Unix98
6610 ftruncate64 NEW: LFS
6612 fwrite_unlocked NEW: GNU ext.
6613 gai_strerror NEW: IPv6
6617 getchar_locked REMOVED
6619 getdate_err NEW: Unix98
6620 getdate_r NEW: GNU ext.
6622 getnameinfo NEW: IPv6
6623 getnetname NEW: Secure RPC
6624 getpmsg NEW: STREAMS
6625 getpt NEW: Unix98 PTY
6626 getrlimit64 NEW: LFS
6627 getutxent NEW: Unix98
6628 getutxid NEW: Unix98
6629 getutxline NEW: Unix98
6630 glob64 NEW: GNU ext.
6631 globfree64 NEW: GNU ext.
6632 gnu_get_libc_release NEW: GNU ext.
6633 gnu_get_libc_version NEW: GNU ext.
6634 grantpt NEW: Unix98 PTY
6635 host2netname NEW: Secure RPC
6637 iconv_close NEW: iconv
6638 iconv_open NEW: iconv
6639 if_freenameindex NEW: IPv6
6640 if_indextoname NEW: IPv6
6641 if_nameindex NEW: IPv6
6642 if_nametoindex NEW: IPv6
6643 in6addr_any NEW: IPv6
6644 in6addr_loopback NEW: IPv6
6645 inet6_isipv4mapped NEW: IPv6
6646 isastream NEW: STREAMS
6647 iswblank NEW: GNU ext.
6648 key_decryptsession NEW: Secure RPC
6649 key_decryptsession_pk NEW: Secure RPC
6650 key_encryptsession NEW: Secure RPC
6651 key_encryptsession_pk NEW: Secure RPC
6652 key_gendes NEW: Secure RPC
6653 key_get_conv NEW: Secure RPC
6654 key_secretkey_is_set NEW: Secure RPC
6655 key_setnet NEW: Secure RPC
6656 key_setsecret NEW: Secure RPC
6657 llrint NEW: ISO C 9x
6658 llrintf NEW: ISO C 9x
6659 llrintl NEW: ISO C 9x
6660 llround NEW: ISO C 9x
6661 llroundf NEW: ISO C 9x
6662 llroundl NEW: ISO C 9x
6667 lrintf NEW: ISO C 9x
6668 lrintl NEW: ISO C 9x
6669 lround NEW: ISO C 9x
6670 lroundf NEW: ISO C 9x
6671 lroundl NEW: ISO C 9x
6673 makecontext NEW: Unix98
6674 mempcpy NEW: GNU ext.
6677 modify_ldt NEW: kernel
6681 nearbyint NEW: ISO C 9x
6682 nearbyintf NEW: ISO C 9x
6683 nearbyintl NEW: ISO C 9x
6684 netname2host NEW: Secure RPC
6685 netname2user NEW: Secure RPC
6686 nexttoward NEW: ISO C 9x
6687 nexttowardf NEW: ISO C 9x
6688 nexttowardl NEW: ISO C 9x
6692 passwd2des NEW: Secure RPC
6694 pow10f NEW: GNU ext.
6695 pow10l NEW: GNU ext.
6698 printf_size NEW: GNU ext.
6699 printf_size_info NEW: GNU ext.
6700 profil_counter REMOVED
6701 pthread_mutexattr_getkind_np REPLACED
6702 pthread_mutexattr_setkind_np REPLACED
6703 ptsname NEW: Unix98 PTY
6704 ptsname_r NEW: Unix98 PTY
6706 putchar_locked REMOVED
6707 putgrent NEW: GNU ext.
6709 putpmsg NEW: STREAMS
6710 pututxline NEW: Unix98
6714 readdir64_r NEW: LFS
6715 remquo NEW: ISO C 9x
6716 remquof NEW: ISO C 9x
6717 remquol NEW: ISO C 9x
6719 roundf NEW: ISO C 9x
6720 roundl NEW: ISO C 9x
6722 scalbln NEW: ISO C 9x
6723 scalblnf NEW: ISO C 9x
6724 scalblnl NEW: ISO C 9x
6726 sendfile NEW: kernel
6727 setcontext NEW: Unix98
6728 setrlimit64 NEW: LFS
6729 setutxent NEW: Unix98
6731 sigignore NEW: Unix98
6732 sigqueue NEW: POSIX.1b
6733 sigrelse NEW: Unix98
6734 sigset NEW: POSIX.1b
6735 sigtimedwait NEW: POSIX.1b
6736 sigwaitinfo NEW: POSIX.1b
6737 sincos NEW: GNU ext.
6738 sincosf NEW: GNU ext.
6739 sincosl NEW: GNU ext.
6743 strcasestr NEW: GNU ext.
6744 strtoimax NEW: ISO C 9x
6745 strtoumax NEW: ISO C 9x
6746 strverscmp NEW: GNU ext.
6747 svcauthdes_stats NEW: Secure RPC
6748 svcunix_create NEW: sunrpc etx
6749 svcunixfd_create NEW: sunrpc ext
6750 swapcontext NEW: Unix98
6751 tcgetsid NEW: Unix98 PTY
6752 tdestroy NEW: GNU ext.
6753 tgamma NEW: ISO C 9x
6754 tgammaf NEW: ISO C 9x
6755 tgammal NEW: ISO C 9x
6759 truncf NEW: ISO C 9x
6760 truncl NEW: ISO C 9x
6762 unlockpt NEW: Unix98 PTY
6763 updwtmpx NEW: Unix98
6764 user2netname NEW: Secure RPC
6765 utmpxname NEW: Unix98
6766 versionsort NEW: GNU ext.
6767 versionsort64 NEW: GNU ext.
6769 wcscasecmp NEW: GNU ext.
6770 wcsncasecmp NEW: GNU ext.
6771 wcsnlen NEW: GNU ext.
6772 wcstoimax NEW: ISO C 9x
6773 wcstoll NEW: ISO C 9x
6774 wcstoull NEW: ISO C 9x
6775 wcstoumax NEW: ISO C 9x
6777 wordexp NEW: POSIX.2
6778 wordfree NEW: POSIX.2
6779 write_profiling REMOVED
6780 xdecrypt NEW: Secure RPC
6781 xdr_authdes_cred NEW: Secure RPC
6782 xdr_authdes_verf NEW: Secure RPC
6783 xdr_cryptkeyarg NEW: Secure RPC
6784 xdr_cryptkeyarg2 NEW: Secure RPC
6785 xdr_cryptkeyres NEW: Secure RPC
6786 xdr_getcredres NEW: Secure RPC
6787 xdr_key_netstarg NEW: Secure RPC
6788 xdr_key_netstres NEW: Secure RPC
6789 xdr_keybuf NEW: Secure RPC
6790 xdr_keystatus NEW: Secure RPC
6791 xdr_netnamestr NEW: Secure RPC
6792 xdr_sizeof NEW: Secure RPC
6793 xdr_unixcred NEW: sunrpc ext
6794 xencrypt NEW: Secure RPC
6795 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6806 * inet_ntoa is thread-safe
6808 * updwtmp is moved from libutil to libc
6810 * rewrite of cbrt function
6812 * update of timezone data
6826 * add atoll function
6828 * fix complex problems in Berkeley DB code
6830 * fix math functions
6834 * fixed lots of header problems (especially Linux/GNU specific)
6836 * dynamic loader preserves all registers
6838 * Roland McGrath provided support for handling of auxiliary objects in
6839 the ELF dynamic loader.
6841 * support for parallel builds is improved
6845 * GNU extensions are no longer declared by default. To enable them you
6846 must define the macro `_GNU_SOURCE' in your program or compile with
6849 * The library has changed from using GNU ld symbol aliases to using weak
6850 symbols where available. The ELF object file format supports weak
6851 symbols; GNU ld also supports weak symbols in the a.out format. (There
6852 is also now support for other GNU ld extensions in ELF. Use the
6853 `--with-elf' option to configure to indicate you have ELF, and
6854 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6855 of many files which contained only symbol aliases, reducing the size of
6856 the source and the compiled library; many other files were renamed to
6857 less cryptic names previously occupied by the symbol alias files.
6858 There is a new header file <elf.h> for programs which operate on
6859 files in the ELF format.
6861 * Converted to Autoconf version 2, so `configure' has more options.
6862 Run `configure --help' to see the details.
6864 * The library can now be configured to build profiling, highly-optimized
6865 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6866 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6867 `configure' enable building these extra libraries. The shared library is
6868 built by default when using both ELF and GNU ld. When shared libraries
6869 are enabled, the new library `-ldl' is available for arbitrary run-time
6870 loading of shared objects; its interface is defined in <dlfcn.h>. The
6871 new header file <link.h> gives access to the internals of the run-time
6872 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6873 application of same name on other systems and it provides information
6874 about dynamically linked binaries.
6876 * The C library now provides the run-time support code for profiling
6877 executables compiled with `-pg'. Programs can control the profiling code
6878 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6879 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6880 the support for this file format was contributed by David Mosberger-Tang.
6882 * The math code has been replaced with a math library based on fdlibm from
6883 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6884 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6885 functions. The math functions now reside in a separate library, so
6886 programs using them will need to use `-lm' their linking commands.
6888 * John C. Bowman contributed optimized ix87 assembler inline functions.
6890 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6891 mechanism similar to that found in Solaris 2. This is now used for the
6892 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6893 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6894 file controls what services are used for each individual database. This
6895 works by loading shared libraries with names specified in `nsswitch.conf',
6896 so service modules can be changed or added at any time without even
6897 relinking any program. Currently there are the file, db, and NIS based
6898 NSS services available.
6900 * The new functions `strtoq' and `strtouq' parse integer values from
6901 strings, like `strtol' and `strtoul', but they return `long long int' and
6902 `unsigned long long int' values, respectively (64-bit quantities).
6904 * The new functions `strtof' and `strtold' parse floating-point values from
6905 strings, like `strtod', but they return `float' and `long double' values,
6906 respectively (on some machines `double' and `long double' are the same).
6908 * Ulrich Drepper has contributed new implementations of the floating-point
6909 printing and reading code used in the `printf' family of functions and
6910 `strtod', `strtof', and `strtold'. These new functions are perfectly
6911 accurate, and much faster than the old ones.
6913 * The implementation of the POSIX locale model was completely rewritten by
6914 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6915 to compile the POSIX locale definition.
6917 * The former dummy implementations of the strcoll and strxfrm function are
6918 now replaced by fully functional code contributed by Ulrich Drepper. The
6919 collation information comes from the POSIX locale definitions.
6921 * The new header <langinfo.h> defines an interface for accessing
6922 various locale-dependent data (using the locale chosen with `setlocale').
6924 * Ulrich Drepper has contributed a new suite of functions for operation on
6925 wide-character and multibyte-character strings, in <wchar.h>;
6926 and classification and case conversion of wide characters, in <wctype.h>.
6927 These new functions are conforming to the ISO C, Amendement 1 specification.
6929 * There is now a second implementation of the standard I/O library available.
6930 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6931 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6933 * You can now use positional parameter specifications in format strings
6934 for the `printf' and `scanf' families of functions. For example,
6935 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6936 ``Number 6, Mr Jones''. This is mainly useful when providing different
6937 format strings for different languages, whose grammars may dictate
6938 different orderings of the values being printed. To support this
6939 feature, the interface for `register_printf_handler' has changed; see
6940 the header file <printf.h> for details.
6942 * The `printf' and `scanf' families of functions now understand a new
6943 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6944 to group numbers as indicated by the locale; for `scanf' and friends, this
6945 says to accept as valid only a number with all the proper grouping
6946 separators in the right places. In the default "C" locale, numbers are
6947 not grouped; but locales for specific countries will define the usual
6948 conventions (i.e. separate thousands with `,' in the US locale).
6950 * The pgrp functions have been regularized, slightly incompatibly but much
6951 less confusingly. The core functions are now `getpgid' and `setpgid',
6952 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6953 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6954 provided for compatibility. There is no longer an incompatible `getpgrp'
6955 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6957 * The new header file <fts.h> and suite of functions simplify programs that
6958 operate on directory trees. This code comes from 4.4 BSD.
6960 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6961 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6962 NSS scheme used in glibc.
6964 * There is a new malloc debugging hook `__memalign_hook'.
6966 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6967 `unsigned int' in <sys/types.h>. These are for compatibility only and
6968 their use is discouraged.
6970 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6971 done differently, so that it works even without GNU ld.
6973 * New function `euidaccess' checks allowed access to a file like `access',
6974 but using the effective IDs instead of the real IDs.
6976 * The time zone data files have been updated for the latest and greatest
6977 local time conventions of the countries of the world.
6979 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6982 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6983 for formatting floating-point numbers. They are provided only for
6984 compatibility; new programs should use `sprintf' instead. There are
6985 also equivalent function for the `long double' floating-point type and
6986 all functions also exist in a reentrant form.
6988 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6989 functions for maintaining the login-record files (primarily of use to
6990 system programs such as `login'), and convenient functions for
6991 allocating and initializing a pseudo-terminal (pty) device.
6993 * Ulrich Drepper has contributed new support for System V style
6994 shared memory and IPC on systems that support it.
6996 * Ulrich Drepper has contributed several miscellaneous new functions found
6997 in System V: The `hsearch' family of functions provide an effective
6998 implementation of hash tables; `a64l' and `l64a' provide a very simple
6999 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7002 * Ulrich Drepper has contributed new reentrant counterparts for the
7003 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7005 * Ulrich Drepper has contributed new, highly-optimized versions of several
7006 string functions for the i486/Pentium family of processors.
7008 * Ulrich Drepper has updated the Linux-specific code, based largely
7009 on work done in Hongjiu Lu's version of GNU libc for Linux.
7010 The GNU library now supports Linux versions 2.0.10 and later,
7011 using the ELF object file format (i[3456]86-*-linux).
7013 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7015 * David Mosberger-Tang and Richard Henderson have ported the C library
7016 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7017 dynamic linking support for ELF/Alpha.
7019 * Richard Henderson contributed several Alpha optimized assembler function
7020 for arithmetic and string handling.
7022 * Ulrich Drepper has contributed a new set of message catalog functions to
7023 support multiple languages using the <libintl.h> interface, for use with
7024 his new package GNU gettext. Translation volunteers have contributed
7025 catalogs of the library's messages in Spanish, German, and Korean.
7027 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7028 program and the `catgets' function for reading the catalog files it
7029 creates. (The <libintl.h> interface is preferred; we include the
7030 <nl_types.h> interface using `catgets' only for source compatibility with
7031 programs already written to use it.)
7033 * New header file <values.h> gives SVID-compatible names for <limits.h>
7036 * Various new macros, declarations, and small header files for compatibility
7039 * New function `group_member' is a convenient way to check if a process has
7040 a given effective group ID.
7042 * When using GCC 2.7 and later, the socket functions are now declared in a
7043 special way so that passing an argument of type `struct sockaddr_in *',
7044 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7045 `struct sockaddr *' type, does not generate a type-clash warning.
7047 * New function `error' declared in header file <error.h> is a convenient
7048 function for printing error messages and optionally exiting; this is the
7049 canonical function used in GNU programs. The new functions `err', `warn',
7050 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7051 doing the same thing.
7053 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7054 POSIX.2 `glob' function to do ~ and {...} expansion.
7056 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7057 `clearenv' which is used in POSIX.9 is also available.
7059 * New function `getsid' returns session ID number on systems that support it.
7061 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7062 files <db.h> and <mpool.h> provide a rich set of functions for several
7063 types of simple databases stored in memory and in files, and <ndbm.h> is
7064 an old `ndbm'-compatible interface using the `db' functions. Link with
7065 `-ldb' to get these functions.
7067 * New macro `strdupa' copies a string like `strdup', but uses local stack
7068 space from `alloca' instead of dynamic heap space from `malloc'.
7070 * New function `strnlen' is like `strlen' but searches only a given maximum
7071 number of characters for the null terminator. `stpncpy', `strndup' and
7072 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7075 * New function `statfs' in header <sys/statfs.h>.
7077 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7078 provide convenient functions for operating on blocks of null-terminated
7081 * A new suite of functions in <utmp.h> handle all the details of reading
7082 and writing the utmp file.
7084 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7087 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7088 completely POSIX compliant and also implemented the extended functionality
7089 to handle alternate digit representation and alternate era date formats.
7091 * Ulrich Drepper provided an implementation of the `strptime' function
7092 defined in XPG4.2 which transforms a string into a `struct tm' value.
7094 * Paul Eggert provided the tzselect shell script as part of the timezone
7095 code. The shell script makes it easy to select the correct timezone
7098 * The implementation of the malloc family of functions is completely replaced
7099 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7100 The implementation uses the mmap function (if available) and it is
7101 optimized for the use in multi threaded programs.
7103 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7104 functions. This new functionality is usable by specifying a special
7105 salt string and it is compatible with implementation on *BSD systems.
7107 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7108 `getsubopt' to handle second level command line options, `bsd_signal'
7109 to access BSD style `signal' functionality, the obsolete `regexp' style
7112 * the `lchown' function is available on system which support this
7115 * The implementation of the shadow password handling function was contributed
7118 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7120 * POSIX.1g support was added. The <sys/select.h> header is available,
7121 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7122 implementation of `getaddrinfo'.
7126 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7128 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7129 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7131 * The new function `daemon' from 4.4 BSD is useful for server programs that
7132 want to put themselves in the background.
7134 * Joel Sherrill has contributed support for several standalone boards that
7135 run without an operating system.
7137 * `printf', `scanf' and friends now accept a `q' type modifier for long
7138 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7140 * All of the code taken from BSD (notably most of the math and networking
7141 routines) has been updated from the BSD 4.4-Lite release.
7143 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7145 * The new functions `getdomainname' and `setdomainname' fetch or change the
7146 YP/NIS domain name. These are system calls which exist on systems which
7149 * The time zone data files have been updated for the latest international
7152 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7153 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7157 * The C library now includes support for Sun RPC, from Sun's free
7158 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7159 are included. (There is still no support for YP.)
7161 * Tom Quinn has contributed a port of the C library to SGI machines running
7162 Irix 4 (mips-sgi-irix4).
7164 * The new `lockf' function is a simplified interface to the locking
7165 facilities of `fcntl', included for compatibility.
7167 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7169 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7171 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7174 * The error message printed by `assert' for a failed assertion now includes
7175 the name of the program (if using GNU ld) and the name of the calling
7176 function (with versions of GCC that support this).
7178 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7180 * The library now includes the <sys/mman.h> header file and memory
7181 management functions `mmap', `munmap', `mprotect', `msync', and
7182 `madvise', on systems that support those facilities.
7184 * The interface for `mcheck' has changed slightly: the function called to
7185 abort the program when an allocation inconsistency is detected now takes
7186 an argument that indicates the type of failure. The new function
7187 `mprobe' lets you request a consistency check for a particular block at
7188 any time (checks are normally done only when you call `free' or `realloc'
7191 * It is now possible to easily cross-compile the C library, building on one
7192 system a library to run on another machine and/or operating system. All
7193 you need to do is set the variable `HOST_CC' in `configparms' to the
7194 native compiler for programs to run on the machine you are building on (a
7195 few generator programs are used on Unix systems); set `CC' to the
7198 * The new function `fexecve' (only implemented on the GNU system) executes
7199 a program file given a file descriptor already open on the file.
7203 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7204 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7206 * You can set the variable `libprefix' in `configparms' to specify a prefix
7207 to be prepended to installed library files; this makes it easy to install
7208 the GNU C library to be linked as `-lgnuc' or whatever.
7210 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7211 copies a limited number of characters from a string, and returns the
7212 address of the last character written.
7214 * You no longer need to check for whether the installed `stddef.h' is
7215 compatible with the GNU C library. configure now checks for you.
7217 * You can now define a per-stream `fileno' function to convert the
7218 stream's cookie into an integral file descriptor.
7220 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7221 allocates zero bytes of storage, and returns a unique pointer which
7222 you can pass to `realloc' or `free'. The behavior is undefined if
7223 you dereference this pointer.
7225 * The C library now runs on Sony NEWS m68k machines running either
7226 NewsOS 3 or NewsOS 4.
7228 * The new `syscall' function is a system-dependent primitive function
7229 for invoking system calls. It has the canonical behavior on Unix
7230 systems, including unreliable return values for some calls (such as
7231 `pipe', `fork' and `getppid').
7233 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7234 to `EAGAIN', which is the preferred name. On systems whose kernels
7235 use two distinct codes, the C library now translates EWOULDBLOCK to
7236 EAGAIN in every system call function.
7240 * The GNU C Library Reference Manual is now distributed with the library.
7241 `make dvi' will produce a DVI file of the printed manual.
7242 `make info' will produce Info files that you can read on line using C-h i
7243 in Emacs or the `info' program.
7244 Please send comments on the manual to bug-glibc-manual@gnu.org.
7246 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7248 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7250 * Jason Merrill has contributed a port to the Sequent Symmetry running
7251 Dynix version 3 (i386-sequent-dynix).
7253 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7254 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7256 * New function `memory_warnings' lets you arrange to get warnings when
7257 malloc is running out of memory to allocate, like Emacs gives you.
7259 * The C library now contains the relocating allocator used in Emacs 19 for
7260 its editing buffers. This allocator (ralloc) minimizes allocation
7261 overhead and fragmentation by moving allocated regions around whenever it
7262 needs to. You always refer to a ralloc'd region with a "handle" (a
7263 pointer to a pointer--an object of type `void **').
7265 * There is a new `printf' format: `%m' gives you the string corresponding
7266 to the error code in `errno'.
7268 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7269 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7270 pass, the `a' modifier says to fill in a `char **' you pass with a
7273 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7274 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7275 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7277 * `mkstemp' is a traditional Unix function to atomically create and open a
7278 uniquely-named temporary file.
7282 * The standard location for the file that says what the local timezone is
7283 has changed again. It is now `/usr/local/etc/localtime' (or more
7284 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7286 * The distribution no longer contains any files with names longer than 14
7289 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7290 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7292 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7296 * The configuration process has changed quite a bit. The `configure'
7297 script is now used just like the configuration scripts for other GNU
7298 packages. The `sysdeps' directory hierarchy is much rearranged.
7299 The file `INSTALL' explains the new scheme in detail.
7301 * The header files no longer need to be processed into ANSI C and
7302 traditional C versions. There is just one set of files to install, and
7303 it will work with ANSI or old C compilers (including `gcc -traditional').
7305 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7306 MIPS DECStation running Ultrix 4.
7308 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7309 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7310 made itself into a shared library.
7312 * Yet further improved support for the i386, running 4.3 BSD-like systems
7313 (such as Mach 3 with the Unix single-server), or System V.
7315 * New function `strncasecmp' to do case-insensitive string comparison
7316 with limited length.
7318 * New function `strsep' is a reentrant alternative to `strtok'.
7320 * New functions `scandir' and `alphasort' for searching directories.
7322 * New function `setenv' is a better interface to `putenv'.
7324 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7325 function for traversing a directory tree.
7327 * The GNU obstack package is now also part of the C library.
7328 The new function `open_obstack_stream' creates a stdio stream that
7329 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7330 formatted output directly to an obstack.
7332 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7333 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7335 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7337 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7338 things to your strings.
7340 * There are some new test programs: test-fseek, testmb, and testrand.
7342 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7343 These ports are not finished, but are a good starting place for really
7344 supporting those systems.
7346 * `/etc/localtime' is now the standard location for the file that says what
7347 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7348 This follows the general principle that `/etc' is the place for all local
7349 configuration files.
7351 * The C library header files now use `extern "C"' when used by the C++
7352 compiler, so the C library should now work with C++ code.
7354 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7355 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7358 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7359 function which uses the `merge sort' algorithm, and is said to be
7360 significantly faster than the old GNU `qsort' function. Merge sort is
7361 now the standard `qsort' function. The new algorithm can require a lot
7362 of temporary storage; so, the old sorting function is called when the
7363 required storage is not available.
7365 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7366 provides the Unix `crypt' function, plus some other entry points.
7368 * The code and header files taken from 4.4 BSD have been updated with the
7369 latest files released from Berkeley.
7371 ----------------------------------------------------------------------
7374 Permission is granted to anyone to make or distribute verbatim copies
7375 of this document as received, in any medium, provided that the
7376 copyright notice and this permission notice are preserved,
7377 thus giving the recipient permission to redistribute in turn.
7379 Permission is granted to distribute modified versions
7380 of this document, or of portions of it,
7381 under the above conditions, provided also that they
7382 carry prominent notices stating who last changed them.
7385 version-control: never