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 * The getent tool now supports the --no-addrconfig option. The output of
13 getent with --no-addrconfig may contain addresses of families not
14 configured on the current host i.e. as-if you had not passed
15 AI_ADDRCONFIG to getaddrinfo calls.
17 Deprecated and removed features, and other changes affecting compatibility:
19 * The dynamic linker no longer loads shared objects from the "tls"
20 subdirectories on the library search path or the subdirectory that
21 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
22 search mechanism, which was deprecated in version 2.33.
24 Security related changes:
26 CVE-2022-39046: When the syslog function is passed a crafted input
27 string larger than 1024 bytes, it reads uninitialized memory from the
28 heap and prints it to the target log file, potentially revealing a
29 portion of the contents of the heap.
31 The following bugs are resolved with this release:
33 [12154] network: Cannot resolve hosts which have wildcard aliases
34 [12165] libc: readdir: Do not skip entries with zero d_ino values
35 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
36 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
37 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
38 AF_INET6 address (ie docker)
39 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
41 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
42 [28937] dynamic-link: New DSO dependency sorter does not put new map
44 [29249] libc: csu/libc-tls.c:202: undefined reference to
45 `_startup_fatal_not_constant'
46 [29305] network: Inefficient buffer space usage in nss_dns for
47 gethostbyname and other functions
48 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
49 [29402] nscd: nscd: No such file or directory
50 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
52 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
53 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
55 [29463] math: math/test-float128-y1 fails on x86_64
56 [29485] build: Make hangs when the test misc/tst-pidfile returns
58 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
60 [29499] build: Check failed on misc/tst-glibcsyscalls while building
61 for RISCV64 on a unmatched hardware
62 [29501] build: Check failed on stdlib/tst-strfrom while building for
63 RISCV64 on a unmatched hardware
64 [29502] libc: alpha sys/acct.h out of date
65 [29514] build: Need to use -fPIE not -fpie
66 [29528] dynamic-link: __libc_early_init not called after dlmopen that
68 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
69 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
71 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
73 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
75 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
76 [29576] build: librtld.os: in function `_dl_start_profile':
77 (.text+0x9444): undefined reference to `strcpy'
78 [29578] libc: Definition of SUN_LEN() is wrong
79 [29583] build: iconv failures on 32bit platform due to missing large
81 [29600] dynamic-link: dlmopen hangs after loading certain libraries
82 [29604] localedata: Update locale data to Unicode 15.0.0
83 [29605] nscd: Regression in NSCD backend of getaddrinfo
84 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
86 [29611] string: Optimized AVX2 string functions unconditionally use
88 [29624] malloc: errno is not cleared when entering main
89 [29638] libc: stdlib: arc4random fallback is never used
90 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
92 [29698] build: Configuring for AArch32 on ARMv8+ disables
94 [29727] locale: __strtol_internal out-of-bounds read when parsing
96 [29730] libc: broken y2038 support in fstatat on MIPS N64
97 [29746] libc: ppoll() does not switch to __ppoll64 when
98 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
99 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
100 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
101 aux.S: No such file or directory)
102 [29864] libc: __libc_start_main() should obtain program headers
103 address (_dl_phdr) from the auxv, not the ELF header.
104 [29951] time: daylight variable not set correctly if last DST change
105 coincides with offset change
106 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
107 length in fortify mode
113 * Support for DT_RELR relative relocation format has been added to
114 glibc. This is a new ELF dynamic tag that improves the size of
115 relative relocations in shared object files and position independent
116 executables (PIE). DT_RELR generation requires linker support for
117 -z pack-relative-relocs option, which is supported for some targets
118 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
120 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
121 have been added. The pidfd functionality provides access to a process
122 while avoiding the issue of PID reuse on tranditional Unix systems.
124 * On Linux, the process_madvise function has been added. It has the
125 same functionality as madvise but alters the target process identified
128 * On Linux, the process_mrelease function has been added. It allows a
129 caller to release the memory of a dying process. The release of the
130 memory is carried out in the context of the caller, using the caller's
131 CPU affinity, and priority with CPU usage accounted to the caller.
133 * The “no-aaaa” DNS stub resolver option has been added. System
134 administrators can use it to suppress AAAA queries made by the stub
135 resolver, including AAAA lookups triggered by NSS-based interfaces
136 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
137 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
138 produce IPv6 addresses, and configured IPv6 name servers are still
139 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
140 are translated to A queries. The new resolver option is intended
141 primarily for diagnostic purposes, to rule out that AAAA DNS queries
142 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
143 validation by applications.
145 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
146 and mount_setattr have been added. They are part of the new Linux kernel
147 mount APIs that allow applications to more flexibly configure and operate
148 on filesystem mounts. The new mount APIs are specifically designed to work
151 * localedef now accepts locale definition files encoded in UTF-8.
152 Previously, input bytes not within the ASCII range resulted in
153 unpredictable output.
155 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
156 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
157 Support for the char8_t typedef has been added per the ISO C2X N2653
158 proposal. The functions are declared in uchar.h in C2X mode or when the
159 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
160 The char8_t typedef is declared in uchar.h in C2X mode or when the
161 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
162 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
164 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
165 added. The functions wrap getrandom and/or /dev/urandom to return high-
166 quality randomness from the kernel.
168 * Support for LoongArch running on Linux has been added. This port requires
169 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
172 - loongarch64-linux-gnu
174 The LoongArch ABI is 64-bit little-endian.
176 Deprecated and removed features, and other changes affecting compatibility:
178 * Support for prelink will be removed in the next release; this includes
179 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
180 variables and their functionality in the dynamic loader.
182 * The Linux kernel version check has been removed along with the
183 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
184 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
185 when libc.so is issued directly.
187 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
189 The following bugs are resolved with this release:
191 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
192 return different result with versioned "foo"
193 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
195 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
196 ./exe and ld.so adjusts argv on the stack
197 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
199 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
200 consuming the second byte of certain double byte characters
201 [25812] stdio: Libio vtable protection is sometimes only partially
203 [27054] libc: pthread_atfork handlers that call pthread_atfork
205 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
207 [28128] build: declare_symbol_alias doesn't work for assembly codes
208 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
209 [28752] nss: Segfault in getpwuid when stat fails
210 [28815] libc: realpath should not copy to resolved buffer on error
211 [28828] stdio: fputwc crashes
212 [28838] libc: FAIL: elf/tst-p_align3
213 [28845] locale: ld-monetary.c should be updated to match ISO C and
215 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
217 [28852] libc: getaddrinfo leaks memory with AI_ALL
218 [28853] libc: tst-spawn6 changes current foreground process group
219 (breaks test isolation)
220 [28857] libc: FAIL: elf/tst-audit24a
221 [28860] build: --enable-kernel=5.1.0 build fails because of missing
222 __convert_scm_timestamps
223 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
224 inaccurate without /sys and /proc
225 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
227 [28880] libc: Program crashes if date beyone 2038
228 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
229 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
230 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
231 rtm variants when avoiding overflow
232 [28922] build: The .d dependency files aren't always generated
233 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
235 [28936] build: nm: No such file
236 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
237 [28953] nss: NSS lookup result can be incorrect if function lookup
239 [28970] math: benchtest: libmvec benchmark doesn't build with make
241 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
242 /sys/devices/system/cpu/possible
243 [28993] libc: closefrom() iterates until max int if no access to
245 [28996] libc: realpath fails to copy partial result to resolved buffer
247 [29027] math: [ia64] fabs fails with sNAN input
248 [29029] nptl: poll() spuriously returns EINTR during thread
249 cancellation and with cancellation disabled
250 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
251 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
252 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
253 is promoted to global scope
254 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
255 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
256 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
258 [29097] time: fchmodat does not handle 64 bit time_t for
260 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
262 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
263 [29162] string: [PATCH] string.h syntactic error:
264 include/bits/string_fortified.h:110: error: expected ',' or ';'
265 before '__fortified_attr_access'
266 [29165] libc: [Regression] broken argv adjustment
267 [29187] dynamic-link: [regression] broken argv adjustment for nios2
268 [29193] math: sincos produces a different output than sin/cos
269 [29197] string: __strncpy_power9() uses uninitialised register vs18
270 value for filling after \0
271 [29203] libc: daemon is not y2038 aware
272 [29204] libc: getusershell is not 2038 aware
273 [29207] libc: posix_fallocate fallback implementation is not y2038
275 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
276 [29209] libc: isfdtype is not y2038 aware
277 [29210] network: ruserpass is not y2038 aware
278 [29211] libc: __open_catalog is not y2038 aware
279 [29213] libc: gconv_parseconfdir is not y2038 aware
280 [29214] nptl: pthread_setcanceltype fails to set type
281 [29225] network: Mistyped define statement in socket/sys/socket.h in
283 [29274] nptl: __read_chk is not a cancellation point
284 [29279] libc: undefined reference to `mbstowcs_chk' after
285 464d189b9622932a75302290625de84931656ec0
286 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
287 correct for !__ASSUME_TIME64_SYSCALLS
288 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
289 missing on microblaze with largefile
295 * Unicode 14.0.0 Support: Character encoding, character type info, and
296 transliteration tables are all updated to Unicode 14.0.0, using
297 generator scripts contributed by Mike FABIAN (Red Hat).
299 * Bump r_version in the debugger interface to 2 and add a new field,
300 r_next, support multiple namespaces.
302 * Support for the C.UTF-8 locale has been added to glibc. The locale
303 supports full code-point sorting for all valid Unicode code points. A
304 limitation in the framework for fnmatch, regexec, and regcomp requires
305 a compromise to save space and only ASCII-based range expressions are
306 supported for now (see bug 28255). The full size of the locale is
307 only ~400KiB, with 346KiB coming from LC_CTYPE information for
308 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
309 in various downstream distributions. The locale is not built into
310 glibc, and must be installed.
312 * <math.h> functions that round their results to a narrower type, and
313 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
314 18661-3:2015 and draft ISO C2X:
316 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
317 fMxsqrtfN and fMxsqrtfNx functions.
319 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
322 * <math.h> functions for floating-point maximum and minimum,
323 corresponding to new operations in IEEE 754-2019, and corresponding
324 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
325 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
326 fminimum_mag, fminimum_mag_num and corresponding functions for float,
327 long double, _FloatN and _FloatNx.
329 * <math.h> macros for single-precision float constants are added as a
330 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
331 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
334 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
335 predefined as specified in TS 18661-1:2014.
337 * The exp10 functions in <math.h> now have a corresponding type-generic
340 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
342 * printf-family functions now support the %b format for output of
343 integers in binary, as specified in draft ISO C2X, and the %B variant
344 of that format recommended by draft ISO C2X.
346 * A new DSO sorting algorithm has been added in the dynamic linker that uses
347 topological sorting by depth-first search (DFS), solving performance issues
348 of the existing sorting algorithm when encountering particular circular
349 object dependency cases.
351 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
352 the two DSO sorting algorithms. The default setting of '2' uses the
353 new DFS-based algorithm. The setting '1' switches to the old
354 algorithm used in glibc 2.33 and earlier.
356 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
357 to be used by compilers for optimizing usage of 'memcmp' when its
358 return value is only used for its boolean status.
360 * Support for automatically registering threads with the Linux rseq
361 system call has been added. This system call is implemented starting
362 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
363 operations on per-cpu data. It allows user-space to perform updates
364 on per-cpu data without requiring heavy-weight atomic operations.
365 Automatically registering threads allows all libraries, including
366 libc, to make immediate use of the rseq support by using the
367 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
368 variables. The GNU C Library manual has details on integration of
369 Restartable Sequences.
371 * A symbolic link to the dynamic linker is now installed under
372 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
374 * All programs and the testsuite in glibc are now built as position independent
375 executables (PIE) by default on toolchains and architectures that support it.
376 Further, if the toolchain and architecture supports it, even static programs
377 are built as PIE and the resultant glibc can be used to build static PIE
378 executables. A new option --disable-default-pie has been added to disable
379 this behavior and get a non-PIE build. This option replaces
380 --enable-static-pie, which no longer has any effect on the build
383 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
384 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
385 or to use huge pages directly with mmap calls with the MAP_HUGETLB
386 flags). The former can improve performance when Transparent Huge Pages
387 is set to 'madvise' mode while the latter uses the system reserved
390 * The printf family of functions now handles the flagged %#m conversion
391 specifier, printing errno as an error constant (similar to strerrorname_np).
393 * The function _dl_find_object has been added. In-process unwinders
394 can use it to efficiently locate unwinding information for a code
397 * Support for OpenRISC running on Linux has been added. This port requires
398 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
403 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
404 64-bit file offsets (LFS default).
406 * A new configure option, --with-rtld-early-cflags, can be used to
407 specify additional compiler flags for building the early startup code
408 of the dynamic linker. On targets which have CPU compatibility
409 checks, this can help to ensure that proper diagnostics are printed if
410 the dynamic loader runs on an incompatible CPU.
412 * On Linux, the epoll_pwait2 function has been added. It is similar to
413 epoll_wait with the difference the timeout has nanoseconds resolution.
415 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
416 enabling posix_spawn and posix_spawnp to set the controlling terminal in
417 the new process in a race free manner. This function is a GNU extension.
419 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
420 applications compiling with glibc and gcc 12 and later. Level 3 leverages
421 the __builtin_dynamic_object_size function to deliver additional
422 fortification balanced against additional runtime cost (checking non-constant
425 * The audit libraries will avoid unnecessary slowdown if it is not required
426 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
428 Deprecated and removed features, and other changes affecting compatibility:
430 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
431 has been removed since the first PT_LOAD segment is no longer executable
432 due to defaulting to -z separate-code.
434 * The r_version update in the debugger interface makes the glibc binary
435 incompatible with GDB binaries built without the following commits:
437 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
438 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
440 when audit modules or dlmopen are used.
442 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
444 * The --enable-static-pie option is no longer available. The glibc build
445 configuration script now automatically detects static-pie support in the
446 toolchain and architecture and enables it if available.
448 * The catchsegv script and associated libSegFault.so shared object have
449 been removed. There are widely-deployed out-of-process alternatives for
450 catching coredumps and backtraces.
452 * Support for prelink will be removed in the next release; this includes
453 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
454 variables and their functionality in the dynamic loader.
456 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
457 functionality to obtain the program mapping address can be achieved by
458 using LD_TRACE_LOADED_OBJECTS to value of 2.
460 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
461 support prelink PIE binaries.
463 Changes to build and runtime requirements:
465 * The audit module interface version LAV_CURRENT is increased to enable
466 proper bind-now support. The loader now advertises via the la_symbind
467 flags that PLT trace is not possible. New audit modules require the
468 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
469 modules are still loaded for all targets except aarch64.
471 * The audit interface on aarch64 is extended to support both the indirect
472 result location register (x8) and NEON Q register. Old audit modules are
473 rejected by the loader. Audit modules must be rebuilt to use the newer
474 structure sizes and the latest module interface version for LAV_CURRENT.
476 Security related changes:
478 CVE-2022-23219: Passing an overlong file name to the clnt_create
479 legacy function could result in a stack-based buffer overflow when
480 using the "unix" protocol. Reported by Martin Sebor.
482 CVE-2022-23218: Passing an overlong file name to the svcunix_create
483 legacy function could result in a stack-based buffer overflow.
485 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
486 function could result in a memory leak and potential access of
487 uninitialized memory. Reported by Qualys.
489 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
490 function may result in an off-by-one buffer underflow and overflow
491 when the current working directory is longer than PATH_MAX and also
492 corresponds to the / directory through an unprivileged mount
493 namespace. Reported by Qualys.
495 The following bugs are resolved with this release:
497 [12889] nptl: Race condition in pthread_kill
498 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
499 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
500 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
502 [15333] libc: Use 64-bit stat functions in installed programs
503 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
505 [15971] dynamic-link: No interface for debugger access to libraries
507 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
508 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
509 deeply nested DSO dependencies.
510 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
511 ID whose lifetime has not ended
512 [22542] network: buffer overflow in sunrpc clnt_create
514 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
516 [25947] malloc: memory leak in muntrace
517 [26045] math: fmaxf(inf, nan) does not always work
518 [26108] math: exp10() has problems with <tgmath.h>
519 [26779] build: benign use after realloc at localealias.c:329
520 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
521 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
522 [27945] build: build-many-glibcs.py doesn't configure GCC with
523 --enable-initfini-array
524 [27991] build: x86: sysdeps/x86/configure.ac breaks when
525 libc_cv_include_x86_isa_level is loaded from cache
526 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
527 in __REDIRECT_NTH macro
528 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
529 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
531 [28126] libc: nftw aborts for paths longer than PATH_MAX
532 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
533 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
535 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
536 [28185] math: Inaccurate j0f function (again)
537 [28199] locale: iconvconfig prefix flag behaves differently in glibc
539 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
540 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
542 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
543 [28223] libc: mips: clone does not align stack
544 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
546 [28256] malloc: Conditional jump or move depends on uninitialised
547 value(s) in __GI___tunables_init
548 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
549 spawn5 fail if stray fds are open
550 [28310] libc: Do not use affinity mask for sysconf
551 (_SC_NPROCESSORS_CONF)
552 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
554 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
556 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
557 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
559 [28353] network: Race condition on __opensock
560 [28357] dynamic-link: deadlock between pthread_create and ctors
561 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
562 [28361] nptl: Fix for bug 12889 causes setxid deadlock
563 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
564 [28390] localedata: Update locale data to Unicode 14.0.0
565 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
567 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
569 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
570 to tgkill (getpid (), gettid())
571 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
572 [28457] dynamic-link: Missing reldepmod4.so dependency for
574 [28469] time: linux: struct timex is not correctly set for 32-bit
575 systems with TIMESIZE=64
576 [28470] regex: Buffer read overrun in regular expression searching
577 [28475] string: Incorrect access attribute on memfrob
578 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
579 spurious NUL character on state reset
580 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
582 [28550] dynamic-link: FAIL: tst-dso-
583 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
585 [28554] build: Undefined generate-md5
586 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
588 [28607] nptl: Masked signals are delivered on thread exit
589 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
590 lack of cpu counting /proc fallback with glibc 2.34
591 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
592 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
593 [28648] dynamic-link: Running ld.so on statically linked binaries
595 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
597 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
598 [28678] nptl: nptl/tst-create1 hangs sporadically
599 [28688] dynamic-link: PT_LOAD p_align check is too strict
600 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
602 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
603 timezones generated by tzcode-2021d and later
604 [28713] math: GCC 12 miscompiles libm
605 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
606 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
607 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
608 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
609 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
610 Assertion `GL(dl_rtld_map).l_libname' failed!
611 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
612 [28757] nptl: GDB printer tests failed with new GDB
613 [28765] math: x86_64 libmvec atan2 accuracy
614 [28766] manual: Document libmvec accuracy
615 [28768] network: Buffer overflow in svcunix_create with long pathnames
617 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
619 [28770] libc: Unexpected return value from realpath() for too long
620 results (CVE-2021-3998)
621 [28771] libc: %ebx optimization macros are incompatible with .altmacro
623 [28780] build: --disable-default-pie doesn't work on static programs
624 [28782] libc: x86-64 ISA level for glibc itself is always
626 [28792] glob: possible wrong behaviour with patterns with double [
628 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
629 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
630 empty mon_decimal_point_wc
637 * In order to support smoother in-place-upgrades and to simplify
638 the implementation of the runtime all functionality formerly
639 implemented in the libraries libpthread, libdl, libutil, libanl has
640 been integrated into libc. New applications do not need to link with
641 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
642 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
643 provided, so that the linker options keep working. Applications which
644 have been linked against glibc 2.33 or earlier continue to load the
645 corresponding shared objects (which are now empty). The integration
646 of those libraries into libc means that additional symbols become
647 available by default. This can cause applications that contain weak
648 references to take unexpected code paths that would only have been
649 used in previous glibc versions when e.g. preloading libpthread.so.0,
650 potentially exposing application bugs.
652 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
653 PTHREAD_STACK_MIN is no longer constant and is redefined to
654 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
655 sets for modern architectural features like Arm SVE.
657 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
658 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
659 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
660 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
661 dynamic sized register sets for modern architectural features like
664 * The dynamic linker implements the --list-diagnostics option, printing
665 a dump of information related to IFUNC resolver operation and
666 glibc-hwcaps subdirectory selection.
668 * On Linux, the function execveat has been added. It operates similar to
669 execve and it is is already used to implement fexecve without requiring
670 /proc to be mounted. However, different than fexecve, if the syscall is not
671 supported by the kernel an error is returned instead of trying a fallback.
673 * The ISO C2X function timespec_getres has been added.
675 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
676 C2X, is supported to enable declarations of functions defined in Annex F
677 of C2X. Those declarations are also enabled when
678 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
679 defined, and when _GNU_SOURCE is defined.
681 * On powerpc64*, glibc can now be compiled without scv support using the
682 --disable-scv configure option.
684 * Add support for 64-bit time_t on configurations like x86 where time_t
685 is traditionally 32-bit. Although time_t still defaults to 32-bit on
686 these configurations, this default may change in future versions.
687 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
688 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
689 only enabled for Linux and the full support requires a minimum kernel
692 * The main gconv-modules file in glibc now contains only a small set of
693 essential converter modules and the rest have been moved into a supplementary
694 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
695 in the same GCONV_PATH. Similarly, external converter modules directories
696 may have supplementary configuration files in a gconv-modules.d directory
697 with names ending with .conf to logically classify the converter modules in
700 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
701 to configure the size of the thread stack cache.
703 * The function _Fork has been added as an async-signal-safe fork replacement
704 since Austin Group issue 62 droped the async-signal-safe requirement for
705 fork (and it will be included in the future POSIX standard). The new _Fork
706 function does not run any atfork function neither resets any internal state
707 or lock (such as the malloc one), and only sets up a minimal state required
708 to call async-signal-safe functions (such as raise or execve). This function
709 is currently a GNU extension.
711 * On Linux, the close_range function has been added. It allows efficiently
712 closing a range of file descriptors on recent kernels (version 5.9).
714 * The function closefrom has been added. It closes all file descriptors
715 greater than or equal to a given integer. This function is a GNU extension,
716 although it is also present in other systems.
718 * The posix_spawn_file_actions_addclosefrom_np function has been added,
719 enabling posix_spawn and posix_spawnp to close all file descriptors greater
720 than or equal to a given integer. This function is a GNU extension,
721 although Solaris also provides a similar function.
723 * When invoked explicitly, the dynamic linker now uses the kernel to
724 execute programs that do not have any dynamic dependency (that is,
725 they are statically linked). This feature is Linux-specific.
727 Deprecated and removed features, and other changes affecting compatibility:
729 * The function pthread_mutex_consistent_np has been deprecated; programs
730 should use the equivalent standard function pthread_mutex_consistent
733 * The function pthread_mutexattr_getrobust_np has been deprecated;
734 programs should use the equivalent standard function
735 pthread_mutexattr_getrobust instead.
737 * The function pthread_mutexattr_setrobust_np has been deprecated;
738 programs should use the equivalent standard function
739 pthread_mutexattr_setrobust instead.
741 * The function pthread_yield has been deprecated; programs should use
742 the equivalent standard function sched_yield instead.
744 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
746 * Various rarely-used functions declared in <resolv.h> and
747 <arpa/nameser.h> have been deprecated. Applications are encouraged to
748 use dedicated DNS processing libraries if applicable. For <resolv.h>,
749 this affects the functions dn_count_labels, fp_nquery, fp_query,
750 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
751 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
752 p_type, putlong, putshort, res_hostalias, res_isourserver,
753 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
754 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
755 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
756 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
758 * Various symbols previously defined in libresolv have been moved to libc
759 in order to prepare for libresolv moving entirely into libc (see earlier
760 entry for merging libraries into libc). The symbols __dn_comp,
761 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
762 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
763 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
764 __res_search, __res_send formerly in libresolv have been renamed and no
765 longer have a __ prefix. They are now available in libc.
767 * The pthread cancellation handler is now installed with SA_RESTART and
768 pthread_cancel will always send the internal SIGCANCEL on a cancellation
769 request. It should not be visible to applications since the cancellation
770 handler should either act upon cancellation (if asynchronous cancellation
771 is enabled) or ignore the cancellation internal signal. However there are
772 buggy kernel interfaces (for instance some CIFS versions) that could still
773 see a spurious EINTR error when cancellation interrupts a blocking syscall.
775 * Previously, glibc installed its various shared objects under versioned
776 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
777 were provided as symbolic links. Starting with glibc 2.34, the shared
778 objects are installed under their ABI sonames directly, without
779 symbolic links. This increases compatibility with distribution
780 package managers that delete removed files late during the package
781 upgrade or downgrade process.
783 * The symbols mallwatch and tr_break are now deprecated and no longer used in
784 mtrace. Similar functionality can be achieved by using conditional
785 breakpoints within mtrace functions from within gdb.
787 * The __morecore and __after_morecore_hook malloc hooks and the default
788 implementation __default_morecore have been removed from the API. Existing
789 applications will continue to link against these symbols but the interfaces
790 no longer have any effect on malloc.
792 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
793 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
794 disabled by default in the main C library. Users looking to use these
795 features now need to preload a new debugging DSO libc_malloc_debug.so to get
796 this functionality back.
798 * The deprecated functions malloc_get_state and malloc_set_state have been
799 moved from the core C library into libc_malloc_debug.so. Legacy applications
800 that still use these functions will now need to preload libc_malloc_debug.so
801 in their environment using the LD_PRELOAD environment variable.
803 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
804 __memalign_hook and __free_hook are now removed from the API. Compatibility
805 symbols are present to support legacy programs but new applications can no
806 longer link to these symbols. These hooks no longer have any effect on glibc
807 functionality. The malloc debugging DSO libc_malloc_debug.so currently
808 supports hooks and can be preloaded to get this functionality back for older
809 programs. However this is a transitional measure and may be removed in a
810 future release of the GNU C Library. Users may port away from these hooks by
811 writing and preloading their own malloc interposition library.
813 Changes to build and runtime requirements:
815 * On Linux, the shm_open, sem_open, and related functions now expect the
816 file shared memory file system to be mounted at /dev/shm. These functions
817 no longer search among the system's mount points for a suitable
818 replacement if /dev/shm is not available.
820 Security related changes:
822 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
823 a request for netgroup lookup, may crash due to a double-free,
824 potentially resulting in degraded service or Denial of Service on the
825 local system. Reported by Chris Schanzle.
827 CVE-2021-33574: The mq_notify function has a potential use-after-free
828 issue when using a notification type of SIGEV_THREAD and a thread
829 attribute with a non-default affinity mask.
831 CVE-2021-35942: The wordexp function may overflow the positional
832 parameter number when processing the expansion resulting in a crash.
833 Reported by Philippe Antoine.
835 The following bugs are resolved with this release:
837 [4737] libc: fork is not async-signal-safe
838 [5781] math: Slow dbl-64 sin/cos/sincos for special values
839 [10353] libc: Methods for deleting all file descriptors greater than
840 given integer (closefrom)
841 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
842 name containing multi-byte character(s)
843 [14469] math: Inaccurate j0f function
844 [14470] math: Inaccurate j1f function
845 [14471] math: Inaccurate y0f function
846 [14472] math: Inaccurate y1f function
847 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
849 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
850 crashes if it fails dlsym() twice
851 [15648] nptl: multiple definition of `__lll_lock_wait_private'
852 [16063] nptl: Provide a pthread_once variant in libc directly
853 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
854 [17145] libc: syslog with LOG_CONS leaks console file descriptor
855 [17183] manual: description of ENTRY struct in <search.h> in glibc
857 [18435] nptl: pthread_once hangs when init routine throws an exception
858 [18524] nptl: Missing calloc error checking in
859 __cxa_thread_atexit_impl
860 [19329] dynamic-link: dl-tls.c assert failure at concurrent
861 pthread_create and dlopen
862 [19366] nptl: returning from a thread should disable cancellation
863 [19511] nptl: 8MB memory leak in pthread_create in case of failure
864 when non-root user changes priority
865 [20802] dynamic-link: getauxval NULL pointer dereference after static
867 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
868 [22057] malloc: malloc_usable_size is broken with mcheck
869 [22668] locale: LC_COLLATE: the last character of ellipsis is not
871 [23323] libc: [RFE] CSU startup hardening.
872 [23328] malloc: Remove malloc hooks and ensure related APIs return no
874 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
875 $PLATFORM, $ORIGIN) crashes
876 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
877 [23554] nptl: pthread_getattr_np reports wrong stack size with
879 [24106] libc: Bash interpreter in ldd script is taken from host
880 [24773] dynamic-link: dlerror in an secondary namespace does not use
881 the right free implementation
882 [25036] localedata: Update collation order for Swedish
883 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
884 shm_open to pick wrong directory
885 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
886 crash in IFUNC resolver due to stack canary (--enable-stack-
888 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
889 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
890 [27111] dynamic-link: pthread_create and tls access use link_map
891 objects that may be concurrently freed by dlclose
892 [27132] malloc: memusagestat is linked to system librt, leading to
893 undefined symbols on major version upgrade
894 [27136] dynamic-link: dtv setup at thread creation may leave an entry
896 [27249] libc: libSegFault.so does not output signal number properly
897 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
899 [27318] dynamic-link: glibc fails to load binaries when built with
900 -march=sandybridge: CPU ISA level is lower than required
901 [27343] nss: initgroups() SIGSEGVs when called on a system without
902 nsswich.conf (in a chroot)
903 [27346] dynamic-link: x86: PTWRITE feature check is missing
904 [27389] network: NSS chroot hardening causes regressions in chroot
906 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
907 [27444] libc: sysconf reports unsupported option (-1) for
908 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
909 [27462] nscd: double-free in nscd (CVE-2021-27645)
910 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
911 malloc/tst-malloc-thread-fail
912 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
913 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
915 [27522] glob: glob, glob64 incorrectly marked as __THROW
916 [27555] dynamic-link: Static tests fail with --enable-stack-
918 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
919 information for the current directory
920 [27577] dynamic-link: elf/ld.so --help doesn't work
921 [27605] libc: tunables can't control xsave/xsavec selection in
923 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
924 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
926 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
927 _nss_files_getcanonname_r) from within a dlmopen namespace.
928 [27648] libc: FAIL: misc/tst-select
929 [27650] stdio: vfscanf returns too early if a match is longer than
931 [27651] libc: Performance regression after updating to 2.33
932 [27655] string: Wrong size calculation in string/test-strnlen.c
933 [27706] libc: select fails to update timeout on error
934 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
935 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
936 tries resolving them lazily
937 [27744] nptl: Support different libpthread/ld.so load orders in
939 [27749] libc: Data race __run_exit_handlers
940 [27761] libc: getconf: Segmentation fault when passing '-vq' as
942 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
943 exceeds maximum object size 2147483647
944 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
946 [27872] build: Obsolete configure option --enable-stackguard-
948 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
949 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
950 [27892] libc: powerpc: scv ABI error handling fails to check
952 [27896] nptl: mq_notify does not handle separately allocated thread
953 attributes (CVE-2021-33574)
954 [27901] libc: TEST_STACK_ALIGN doesn't work
955 [27902] libc: The x86-64 clone wrapper fails to align child stack
956 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
957 [27939] libc: aarch64: clone does not align the stack
958 [27968] libc: s390x: clone does not align the stack
959 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
960 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
962 [28028] malloc: malloc: tcache shutdown sequence does not work if the
963 thread never allocated anything
964 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
965 [28064] string: x86_64:wcslen implementation list has wcsnlen
966 [28067] libc: FAIL: posix/tst-spawn5
967 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
968 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
970 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
971 [28089] build: tst-tls20 fails when linker defaults to --as-needed
972 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
974 [28091] network: ns_name_skip may return 0 for domain names without
982 * The dynamic linker accepts the --list-tunables argument which prints
983 all the supported tunables. This option is disable if glibc is
984 configured with tunables disabled (--enable-tunables=no).
986 * The dynamic linker accepts the --argv0 argument and provides opportunity
987 to change argv[0] string.
989 * The dynamic linker loads optimized implementations of shared objects
990 from subdirectories under the glibc-hwcaps directory on the library
991 search path if the system's capabilities meet the requirements for
992 that subdirectory. Initially supported subdirectories include
993 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
994 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
995 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
996 subdirectory names correspond to the vendor-independent x86-64
997 microarchitecture levels defined in the x86-64 psABI supplement.
999 * The new --help option of the dynamic linker provides usage and
1000 information and library search path diagnostics.
1002 * The mallinfo2 function is added to report statistics as per mallinfo,
1003 but with larger field widths to accurately report values that are
1004 larger than fit in an integer.
1006 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1008 * Support for the RISC-V ISA running on Linux has been expanded to run on
1009 32-bit hardware. This is supported for the following ISA and ABI pairs:
1015 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1018 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1019 glibc may use additional checks that may have an additional performance
1020 overhead. At present these checks are available only on LLVM 9 and later.
1021 The latest GCC available at this time (10.2) does not support this level of
1024 Deprecated and removed features, and other changes affecting compatibility:
1026 * The mallinfo function is marked deprecated. Callers should call
1029 * When dlopen is used in statically linked programs, alternative library
1030 implementations from HWCAP subdirectories are no longer loaded.
1031 Instead, the default implementation is used.
1033 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1034 removed. To support old binaries, the vtimes function continues to exist
1035 as a compatibility symbol. Applications should use the getrlimit or
1038 * Following a change in the tzdata 2018a release upstream, the zdump
1039 program is now installed in the /usr/bin subdirectory. Previously,
1040 the /usr/sbin subdirectory was used.
1042 * On s390(x), the type float_t is now derived from the macro
1043 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1044 hardcoded to double. This does not affect the ABI of any libraries
1045 that are part of the GNU C Library, but may affect the ABI of other
1046 libraries that use this type in their interfaces. The new definition
1047 improves consistency with compiler behavior in many scenarios.
1049 * A future version of glibc will stop loading shared objects from the
1050 "tls" subdirectories on the library search path, the subdirectory that
1051 corresponds to the AT_PLATFORM system name, and also stop employing
1052 the legacy AT_HWCAP search mechanism. Applications should switch to
1053 the new glibc-hwcaps mechanism instead; if they do not do that, only
1054 the baseline version (directly from the search path directory) will be
1057 Changes to build and runtime requirements:
1059 * On Linux, the system administrator needs to configure /dev/pts with
1060 the intended access modes for pseudo-terminals. glibc no longer
1061 attemps to adjust permissions of terminal devices. The previous glibc
1062 defaults ("tty" group, user read/write and group write) already
1063 corresponded to what most systems used, so that grantpt did not
1064 perform any adjustments.
1066 * On Linux, the posix_openpt and getpt functions no longer attempt to
1067 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1068 (and pseudo-terminals are supported), a devpts file system is mounted
1069 on /dev/pts. Current systems already meet these requirements.
1071 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1073 Security related changes:
1075 CVE-2021-3326: An assertion failure during conversion from the
1076 ISO-20220-JP-3 character set using the iconv function has been fixed.
1077 This assertion was triggered by certain valid inputs in which the
1078 converted output contains a combined sequence of two wide characters
1079 crossing a buffer boundary. Reported by Tavis Ormandy.
1081 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1082 invoked with input containing redundant shift sequences in the IBM1364,
1083 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1085 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1086 when invoked with UCS4 input containing an invalid character.
1088 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1089 invoked with EUC-KR input containing invalid multibyte input sequences.
1091 The following bugs are resolved with this release:
1093 [10635] libc: realpath portability patches
1094 [16124] dynamic-link: ld.so should allow to change argv[0]
1095 [17924] malloc: 'free' should not set errno
1096 [18683] libc: Linux faccessat implementation can incorrectly ignore
1098 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1099 [23091] hurd: missing waitid support
1100 [23249] libc: Epyc and other current AMD CPUs do not select the
1101 "haswell" platform subdirectory
1102 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1104 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1106 [24941] libc: Make grantpt usable after multi-threaded fork in more
1108 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1109 [24973] locale: iconv encounters segmentation fault when converting
1110 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1111 [25399] string: undefined reference to `__warn_memset_zero_len' when
1112 changing gnuc version
1113 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1115 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1117 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1118 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1119 [26100] libc: Race in syslog(3) with regards to tag printing.
1120 [26124] libc: Export <cpu-features.h>
1121 [26130] nscd: Inconsistent nscd cache during pruning
1122 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1123 [26224] locale: iconv hangs when converting some invalid inputs from
1124 several IBM character sets (CVE-2020-27618)
1125 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1126 too much stack space
1127 [26343] manual: invalid documented return type for strerrorname_np(),
1128 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1129 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1131 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1133 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1134 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1136 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1137 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1138 [26555] string: strerrorname_np does not return the documented value
1139 [26592] libc: pointer arithmetic overflows in realpath
1140 [26600] network: Transaction ID collisions cause slow DNS lookups in
1142 [26606] libc: [2.33 Regression] pselect is broken on x32
1143 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1144 [26620] glob: fnmatch with collating symbols results in segmentation
1146 [26625] libc: [2.33 Regression] CET is disabled
1147 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1148 at the end of a memory mapping
1149 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1150 by the caller to the kernel
1151 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1152 [26647] build: [-Werror=array-parameter=] due to different
1153 declarations for __sigsetjmp
1154 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1156 [26649] stdio: printf should handle non-normal x86 long double numbers
1157 gracefully (CVE-2020-29573)
1158 [26686] build: -Warray-parameter instances building with GCC 11
1159 [26687] build: -Warray-bounds instances building with GCC 11
1160 [26690] stdio: Aliasing violation in __vfscanf_internal
1161 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1162 [26726] build: GCC warning calling new_composite_name with an array of
1164 [26736] libc: FAIL: misc/tst-sysvshm-linux
1165 [26737] libc: Random FAIL: rt/tst-shm
1166 [26791] libc: Missing O_CLOEXEC in sysconf.c
1167 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1169 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1171 [26818] string: aarch64: string tests may run ifunc variants that are
1173 [26821] libc: Memory leak test failures on Fedora 33
1174 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1175 FSGSBASE/LM/RDRAND check failure
1176 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1178 [26853] libc: aarch64: Missing unwind information in statically linked
1180 [26923] locale: Assertion failure in iconv when converting invalid
1181 UCS4 (CVE-2020-29562)
1182 [26926] dynamic-link: aarch64: library dependencies are not bti
1184 [26932] libc: sh: Multiple floating point functions defined as stubs
1186 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1188 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1190 [27002] build: libc_freeres_fn build failure with GCC 11
1191 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1192 [27008] dynamic-link: ld.so.cache should have endianness markup
1193 [27042] libc: [alpha] anonymous union in struct stat confuses
1195 [27053] libc: Conformance regression in system(3) (and probably also
1197 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1199 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1200 [27083] libc: Unsafe unbounded alloca in addmntent
1201 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1203 [27130] string: "rep movsb" performance issue
1204 [27150] libc: alpha: wait4() is unavailable in static linking
1205 [27177] dynamic-link:
1206 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1208 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1209 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1210 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1211 related to combining characters (CVE-2021-3326)
1218 * Unicode 13.0.0 Support: Character encoding, character type info, and
1219 transliteration tables are all updated to Unicode 13.0.0, using
1220 generator scripts contributed by Mike FABIAN (Red Hat).
1222 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1224 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1225 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1226 Three ABIs are supported:
1232 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1233 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1235 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1236 DT_DEPAUDIT dynamic section entries of the main executable.
1238 * powerpc64le supports IEEE128 long double libm/libc redirects when
1239 using -mabi=ieeelongdouble to compile C code on supported GCC
1240 toolchains. It is recommended to use GCC 8 or newer when testing
1243 * To help detect buffer overflows and other out-of-bounds accesses
1244 several APIs have been annotated with GCC 'access' attribute. This
1245 should help GCC 10 issue better warnings.
1247 * On Linux, functions pthread_attr_setsigmask_np and
1248 pthread_attr_getsigmask_np have been added. They allow applications
1249 to specify the signal mask of a thread created with pthread_create.
1251 * The GNU C Library now provides the header file <sys/single_threaded.h>
1252 which declares the variable __libc_single_threaded. Applications are
1253 encouraged to use this variable for single-thread optimizations,
1254 instead of weak references to symbols historically defined in
1257 * The functions sigabbrev_np and sigdescr_np have been added. The
1258 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1259 SIGHUP) while sigdescr_np returns a string describing the signal number
1260 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1261 attempt to translate the return description, both functions return
1262 NULL for an invalid signal number.
1264 They should be used instead of sys_siglist or sys_sigabbrev and they
1265 are both thread and async-signal safe. These functions are GNU extensions.
1267 * The functions strerrorname_np and strerrordesc_np have been added. The
1268 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1269 while strerrordesc_np returns a string describing the error number
1270 (e.g "Invalid argument" for EINVAL). Different than strerror,
1271 strerrordesc_np does not attempt to translate the return description, both
1272 functions return NULL for an invalid error number.
1274 They should be used instead of sys_errlist and sys_nerr, both are
1275 thread and async-signal safe. These functions are GNU extensions.
1277 * AArch64 now supports standard branch protection security hardening
1278 in glibc when it is built with a GCC that is configured with
1279 --enable-standard-branch-protection (or if -mbranch-protection=standard
1280 flag is passed when building both GCC target libraries and glibc,
1281 in either case a custom GCC is needed). This includes branch target
1282 identification (BTI) and pointer authentication for return addresses
1283 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1284 extensions respectively for the protection to be effective,
1285 otherwise the used instructions are nops. User code can use PAC-RET
1286 without libc support, but BTI requires a libc that is built with BTI
1287 support, otherwise runtime objects linked into user code will not be
1290 Deprecated and removed features, and other changes affecting compatibility:
1292 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1293 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1294 RPC header files. Backward compatibility for old programs is kept
1295 only for architectures and ABIs that have been added in or before
1296 glibc 2.31. New programs need to use TI-RPC
1297 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1298 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1300 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1301 as shared library for backward compatibility and the NSS modules "nis"
1302 and "nisplus" are not built at all and libnsl's headers aren't
1303 installed. This compatibility is kept only for architectures and ABIs
1304 that have been added in or before version 2.28. Replacement
1305 implementations based on TI-RPC, which additionally support IPv6, are
1306 available from <https://github.com/thkukuk/>. This change does not
1307 affect the "compat" NSS module, which does not depend on libnsl
1308 since 2.27 and thus can be used without NIS.
1310 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1311 removed. To support old binaries, the sysctl function continues to
1312 exist as a compatibility symbol (on those architectures which had it),
1313 but always fails with ENOSYS. This reflects the removal of the system
1314 call from all architectures, starting with Linux 5.5.
1316 * The sstk function is no longer available to newly linked binaries.
1317 Its implementation always returned with a failure, and the function
1318 was not declared in any header file.
1320 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1321 sigrelse, sigignore and sigset, and the sigmask macro have been
1322 deprecated. Applications should use the sigsuspend, sigprocmask and
1323 sigaction functions instead.
1325 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1326 already supported this format for almost 20 years.
1328 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1329 are no longer available to newly linked binaries, and their declarations
1330 have been removed from <string.h>. They are exported solely as
1331 compatibility symbols to support old binaries. All programs should use
1334 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1335 are no longer available to newly linked binaries, and their declarations
1336 have been removed from <stdio.h>. They are exported solely as
1337 compatibility symbols to support old binaries. All programs should use
1338 strerror or strerror_r instead.
1340 * Both strerror and strerror_l now share the same internal buffer in the
1341 calling thread, meaning that the returned string pointer may be invalided
1342 or contents might be overwritten on subsequent calls in the same thread or
1343 if the thread is terminated. It makes strerror MT-safe.
1345 * Using weak references to libpthread functions such as pthread_create
1346 or pthread_key_create to detect the singled-threaded nature of a
1347 program is an obsolescent feature. Future versions of glibc will
1348 define pthread_create within libc.so.6 itself, so such checks will
1349 always flag the program as multi-threaded. Applications should check
1350 the __libc_single_threaded variable declared in
1351 <sys/single_threaded.h> instead.
1353 * The "files" NSS module no longer supports the "key" database (used for
1354 secure RPC). The contents of the /etc/publickey file will be ignored,
1355 regardless of the settings in /etc/nsswitch.conf. (This method of
1356 storing RPC keys only supported the obsolete and insecure AUTH_DES
1357 flavor of secure RPC.)
1359 * The __morecore and __after_morecore_hook malloc hooks and the default
1360 implementation __default_morecore have been deprecated. Applications
1361 should use malloc interposition to change malloc behavior, and mmap to
1362 allocate anonymous memory. A future version of glibc may require that
1363 applications which use the malloc hooks must preload a special shared
1364 object, to enable the hooks.
1366 * The hesiod NSS module has been deprecated and will be removed in a
1367 future version of glibc. System administrators are encouraged to
1368 switch to other approaches for networked account databases, such as
1371 Changes to build and runtime requirements:
1373 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1374 long double redirects.
1376 Security related changes:
1378 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1379 invoked with the -c option and when processing invalid multi-byte input
1380 sequences. Reported by Jan Engelhardt.
1382 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1383 corruption when they were passed a pseudo-zero argument. Reported by Guido
1384 Vranken / ForAllSecure Mayhem.
1386 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1387 expanding ~user has been fixed.
1389 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1390 memmove functions has been fixed. Discovered by Jason Royes and Samual
1391 Dytrych of the Cisco Security Assessment and Penetration Team (See
1394 The following bugs are resolved with this release:
1396 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1397 [10441] manual: Backtraces code example lacks error checking
1398 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1399 timer_sigev_thread dangerous
1400 [14231] stdio: stdio-common tests memory requirements
1401 [14578] libc: /proc-based emulation for lchmod, fchmodat
1402 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1403 filtee has constructor
1404 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1405 sequences (CVE-2016-10228)
1406 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1407 character entities for infinity & pi
1408 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1409 segfaults in applications
1410 [20543] libc: Please move from .gnu.linkonce to comdat
1411 [22489] network: gcc warns about implicit convertion in
1412 ICMP6_FILTER_SETPASS with -Wsign-conversion
1413 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1414 [23294] math: Complex _FloatN functions are redirected to the wrong
1415 function with -mlong-double-64
1416 [23296] libc: Data race in setting function descriptor during lazy
1418 [23668] dynamic-link: ldconfig: Default to the new format for
1420 [23819] hurd: hurd: Add C11 thread support
1421 [23990] build: test-container error out on failure to exec child.
1422 [23991] build: shell-container typo in run_command_array
1423 [24638] manual: Error in example of parsing a template string
1424 [24654] manual: Wrong declaration of wcschr in libc manual
1425 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1427 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1428 dynamically loaded dsos
1429 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1430 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1432 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1433 restore EAX, ECX and EDX
1434 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1435 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1436 [25420] network: Race condition in resolv_conf.c can result in caching
1437 stale configuration forever
1438 [25487] math: sinl() stack corruption from crafted input
1440 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1442 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1443 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1445 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1446 on 32 bit and old kernel
1447 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1448 [25639] localedata: Some names of days and months wrongly spelt in
1450 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1451 amount of sigset_t bytes
1452 [25691] stdio: printf: memory leak when printing long multibyte
1454 [25715] libc: system() returns wrong errors when posix_spawn fails
1455 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1456 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1457 state for conversions that produce two Unicode code points
1458 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1459 for linux x86_64 leads to livelock
1460 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1461 test failures, invalid instruction in ld.so
1462 [25790] glob: Typo in tst-fnmatch.input
1463 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1465 [25819] localedata: Update locale data to Unicode 13.0.0
1466 [25824] libc: Abnormal function of strnlen in aarch64
1467 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1468 [25896] libc: Incorrect prctl
1469 [25902] libc: Bad LOADARGS_N
1470 [25905] dynamic-link: VSX registers are corrupted during PLT
1471 resolution when glibc is built with --disable-multi-arch and --with-
1473 [25933] string: Off by one error in __strncmp_avx2 when
1474 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1476 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1477 exiting detached thread
1478 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1480 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1482 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1483 [26073] math: getpayload() has wrong return value
1484 [26076] dynamic-link: dlmopen crashes after failing to load
1485 dependencies in audit mode
1486 [26120] localedata: column width of of some Korean
1487 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1488 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1489 [26133] libc: Incorrect need_arch_feature_F16C
1490 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1492 [26149] libc: PKU is usable only if OSPKE is set
1493 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1495 [26208] libc: Incorrect bit_cpu_CLFSH
1496 [26210] network: Incorrect use of hidden symbols for global sunrpc
1498 [26211] stdio: printf integer overflow calculating allocation size
1499 [26214] stdio: printf_fp double free
1500 [26215] stdio: printf_fp memory leak
1501 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1502 [26258] nss: nss_compat should not read input files with mmap
1503 [26332] string: Incorrect cache line size load causes memory
1504 corruption in memset
1511 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1512 enable features from the draft ISO C2X standard. Only some features from
1513 this draft standard are supported by the GNU C Library, and as the draft
1514 is under active development, the set of features enabled by this macro is
1515 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1516 by compiling with "gcc -std=gnu2x".
1518 * The <math.h> functions that round their results to a narrower type now
1519 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1520 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1521 Clarification Request 13 to TS 18661-3.
1523 * The function pthread_clockjoin_np has been added, enabling join with a
1524 terminated thread with a specific clock. It allows waiting against
1525 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1527 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1529 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1530 in queries if the trust-ad option is set via the options directive in
1531 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1532 mode, the AD bit, as provided by the name server, is available to
1533 applications which call res_search and related functions. In the default
1534 mode, the AD bit is not set in queries, and it is automatically cleared in
1535 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1536 servers and the network path to them are treated as untrusted.)
1538 Deprecated and removed features, and other changes affecting compatibility:
1540 * The totalorder and totalordermag functions, and the corresponding
1541 functions for other floating-point types, now take pointer arguments to
1542 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1543 passing. This is in accordance with the resolution of Clarification
1544 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1545 floating-point arguments directly will continue to work.
1547 * The obsolete function stime is no longer available to newly linked
1548 binaries, and its declaration has been removed from <time.h>.
1549 Programs that set the system time should use clock_settime instead.
1551 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1552 in a future version of glibc. In this release, the header still exists
1553 but calling ftime will cause a compiler warning. All programs should use
1554 gettimeofday or clock_gettime instead.
1556 * The gettimeofday function no longer reports information about a
1557 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1558 many years, as it cannot handle the full complexity of the world's
1559 timezones, but hitherto we have supported it on a best-effort basis.
1560 Changes required to support 64-bit time_t on 32-bit architectures have
1561 made this no longer practical.
1563 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1564 should expect to receive a 'struct timezone' whose tz_minuteswest and
1565 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1566 happen on a few Linux-based ports. This will be corrected in a future
1569 All callers should supply a null pointer for the 'tzp' argument to
1570 gettimeofday. For accurate information about the time zone associated
1571 with the current time, use the localtime function.
1573 gettimeofday itself is obsolescent according to POSIX. We have no plans
1574 to remove access to this function, but portable programs should consider
1575 using clock_gettime instead.
1577 * The settimeofday function can still be used to set a system-wide time
1578 zone when the operating system supports it. This is because the Linux
1579 kernel reused the API, on some architectures, to describe a system-wide
1580 time-zone-like offset between the software clock maintained by the kernel,
1581 and the "RTC" clock that keeps time when the system is shut down.
1583 However, to reduce the odds of this offset being set by accident,
1584 settimeofday can no longer be used to set the time and the offset
1585 simultaneously. If both of its two arguments are non-null, the call
1586 will fail (setting errno to EINVAL).
1588 Callers attempting to set this offset should also be prepared for the call
1589 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1590 some Linux architectures. The Linux kernel maintainers are discussing a
1591 more principled replacement for the reused API. After a replacement
1592 becomes available, we will change settimeofday to fail with ENOSYS on all
1593 platforms when its 'tzp' argument is not a null pointer.
1595 settimeofday itself is obsolescent according to POSIX. Programs that set
1596 the system time should use clock_settime and/or the adjtime family of
1597 functions instead. We may cease to make settimeofday available to newly
1598 linked binaries after there is a replacement for Linux's time-zone-like
1601 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1602 the optional CAS instruction is implemented (for instance, LEON processors
1603 are still supported, but SuperSPARC processors are not).
1605 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1608 * If a lazy binding failure happens during dlopen, during the execution of
1609 an ELF constructor, the process is now terminated. Previously, the
1610 dynamic loader would return NULL from dlopen, with the lazy binding error
1611 captured in a dlerror message. In general, this is unsafe because
1612 resetting the stack in an arbitrary function call is not possible.
1614 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1615 executable stack unless explicitly configured at build time to require
1616 minimum kernel version 4.8 or newer. This is because executing
1617 floating-point branches on a non-executable stack on Linux kernels prior to
1618 4.8 can lead to application crashes for some MIPS configurations. While
1619 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1620 expected to enable non-executable stack by default with PT_GNU_STACK by
1621 default and is thus likely to trigger a crash on older kernels.
1623 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1624 non-executable stack while dropping support for older kernels.
1626 * System call wrappers for time system calls now use the new time64 system
1627 calls when available. On 32-bit targets, these wrappers attempt to call
1628 the new system calls first and fall back to the older 32-bit time system
1629 calls if they are not present. This may cause issues in environments
1630 that cannot handle unsupported system calls gracefully by returning
1631 -ENOSYS. Seccomp sandboxes are affected by this issue.
1633 Changes to build and runtime requirements:
1635 * It is no longer necessary to have recent Linux kernel headers to build
1636 working (non-stub) system call wrappers on all architectures except 64-bit
1637 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1639 * The ChangeLog file is no longer present in the toplevel directory of the
1640 source tree. ChangeLog files are located in the ChangeLog.old directory as
1641 ChangeLog.N where the highest N has the latest entries.
1643 Security related changes:
1645 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1646 out-of-bounds write when executed in a signal frame context.
1648 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1649 environment variable during program execution after a security
1650 transition, allowing local attackers to restrict the possible mapping
1651 addresses for loaded libraries and thus bypass ASLR for a setuid
1652 program. Reported by Marcin Kościelnicki.
1654 The following bugs are resolved with this release:
1656 [12031] localedata: iconv -t ascii//translit with Greek characters
1657 [15813] libc: Multiple issues in __gen_tempname
1658 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1659 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1660 [19767] libc: vdso is not used with static linking
1661 [19903] hurd: Shared mappings not being inherited by children processes
1662 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1663 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1665 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1666 Symbols-A/B Unicode blocks
1667 [23518] libc: Eliminate __libc_utmp_jump_table
1668 [24026] malloc: malloc_info() returns wrong numbers
1669 [24054] localedata: Many locales are missing date_fmt
1670 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1671 [24304] dynamic-link: Lazy binding failure during ELF
1672 constructors/destructors is not fatal
1673 [24376] libc: RISC-V symbol size confusion with _start
1674 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1676 [24824] libc: test-in-container does not install charmap files compatible
1678 [24844] regex: regex bad pointer / leakage if malloc fails
1679 [24867] malloc: Unintended malloc_info formatting changes
1680 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1681 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1682 [24882] libc: login: pututline uses potentially outdated cache
1683 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1684 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1686 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1688 [24930] dynamic-link: dlopen of PIE executable can result in
1689 _dl_allocate_tls_init assertion failure
1690 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1691 (stringop-overflow error)
1692 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1693 functions other can lead to crashes
1694 [24967] libc: jemalloc static linking causes runtime failure
1695 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1697 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1698 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1699 [25097] libc: new -Warray-bounds with GCC 10
1700 [25112] dynamic-link: dlopen must not make new objects accessible when it
1701 still can fail with an error
1702 [25139] localedata: Please add the new mnw_MM locale
1703 [25149] regex: Array bounds violation in proceed_next_node
1704 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1705 initialized correctly
1706 [25189] libc: glibc's __glibc_has_include causes issues with clang
1708 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1709 value to an unsigned
1710 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1711 binaries (CVE-2019-19126)
1712 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1714 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1716 [25232] string: <string.h> does not enable const correctness for strchr et
1718 [25233] localedata: Consider "." as the thousands separator for sl_SI
1720 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1721 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1722 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1724 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1725 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1727 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1728 (dl_initfirst) link map pointer
1729 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1730 [25423] libc: Array overflow in backtrace on powerpc
1731 [25425] network: Missing call to __resolv_context_put in
1732 getaddrinfo.c:gethosts
1739 * Unicode 12.1.0 Support: Character encoding, character type info, and
1740 transliteration tables are all updated to Unicode 12.1.0, using
1741 generator scripts contributed by Mike FABIAN (Red Hat).
1743 * The dynamic linker accepts the --preload argument to preload shared
1744 objects, in addition to the LD_PRELOAD environment variable.
1746 * The twalk_r function has been added. It is similar to the existing
1747 twalk function, but it passes an additional caller-supplied argument
1748 to the callback function.
1750 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1752 * Minguo (Republic of China) calendar support has been added as an
1753 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1756 * The entry for the new Japanese era has been added for ja_JP locale.
1758 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1759 pvalloc, memalign, and posix_memalign fail now with total object size
1760 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1761 pointer subtraction within the allocated object, where results might
1762 overflow the ptrdiff_t type.
1764 * The dynamic linker no longer refuses to load objects which reference
1765 versioned symbols whose implementation has moved to a different soname
1766 since the object has been linked. The old error message, symbol
1767 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1768 link time reference, is gone.
1770 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1771 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1772 functions. These behave similarly to their "timed" equivalents, but also
1773 accept a clockid_t parameter to determine which clock their timeout should
1774 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1775 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1776 time of the wait (unlike with pthread_condattr_setclock, which requires
1777 the clock choice at initialization time).
1779 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1780 work, new resolvers can use a second argument which can be extended in
1781 the future, currently it contains the AT_HWCAP2 value.
1783 Deprecated and removed features, and other changes affecting compatibility:
1785 * The copy_file_range function fails with ENOSYS if the kernel does not
1786 support the system call of the same name. Previously, user space
1787 emulation was performed, but its behavior did not match the kernel
1788 behavior, which was deemed too confusing. Applications which use the
1789 copy_file_range function can no longer rely on glibc to provide a fallback
1790 on kernels that do not support the copy_file_range system call, and if
1791 this function returns ENOSYS, they will need to use their own fallback.
1792 Support for copy_file_range for most architectures was added in version
1793 4.5 of the mainline Linux kernel.
1795 * The functions clock_gettime, clock_getres, clock_settime,
1796 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1797 for new applications (on architectures which had them). Instead, the
1798 definitions in libc will be used automatically, which have been available
1801 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1802 and <sys/stropts.h> have been removed.
1804 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1805 resolver flag (deprecated in glibc 2.25) have been removed.
1807 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1808 resolver have been removed from <resolv.h>.
1810 * With --enable-bind-now, installed programs are now linked with the
1813 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1814 configurations) has been removed, following the deprecation of this
1815 subarchitecture in version 8 of GCC, and its removal in version 9.
1817 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1818 header have been removed.
1820 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1821 deprecated and will be removed from a future version of glibc.
1822 Application should directly access /proc instead. For obtaining random
1823 bits, the getentropy function can be used.
1825 Changes to build and runtime requirements:
1827 * GCC 6.2 or later is required to build the GNU C Library.
1829 Older GCC versions and non-GNU compilers are still supported when
1830 compiling programs that use the GNU C Library.
1832 Security related changes:
1834 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1835 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1836 has undefined behavior. On x32, the size_t argument may be passed
1837 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1838 32 bits. When it happened with the sign bit of RDX register set,
1839 memcmp gave the wrong result since it treated the size argument as
1840 zero. Reported by H.J. Lu.
1842 CVE-2019-9169: Attempted case-insensitive regular-expression match
1843 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1844 over-read. Reported by Hongxu Chen.
1846 The following bugs are resolved with this release:
1848 [2872] locale: Transliteration Cyrillic -> ASCII fails
1849 [6399] libc: gettid() should have a wrapper
1850 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1851 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1852 [17396] localedata: globbing for locale by [[.collating-element.]]
1853 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1854 [18465] malloc: memusagestat is built using system C library
1855 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1856 invalid input drops valid char
1857 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1858 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1859 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1860 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1861 [23352] malloc: __malloc_check_init still defined in public header
1863 [23403] nptl: Wrong alignment of TLS variables
1864 [23501] libc: nftw() doesn't return dangling symlink's inode
1865 [23733] malloc: Check the count before calling tcache_get()
1866 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1868 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1869 [23844] nptl: pthread_rwlock_trywrlock results in hang
1870 [23983] argparse: Missing compat versions of argp_failure and argp_error
1871 for long double = double
1872 [23984] libc: Missing compat versions of err.h and error.h functions for
1873 long double = double
1874 [23996] localedata: Dutch salutations
1875 [24040] libc: riscv64: unterminated call chain in __thread_start
1876 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1878 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1879 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1881 [24114] regex: regexec buffer read overrun in "grep -i
1882 '\(\(\)*.\)*\(\)\(\)\1'"
1883 [24122] libc: Segfaults if 0 returned from la_version
1884 [24153] stdio: Some input functions do not react to stdin assignment
1885 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1886 RDX is set) (CVE-2019-7309)
1887 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1888 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1889 not the default "nor"
1890 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1891 false positives, change to modern flexible array
1892 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1893 instructions while maintaining the robust mutex list due to missing
1895 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1896 unnecessary librt dependencies
1897 [24200] localedata: Revert first_weekday removal in en_IE locale
1898 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1899 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1900 [24216] malloc: Check for large bin list corruption when inserting
1902 [24228] stdio: old x86 applications that use legacy libio crash on exit
1903 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1905 [24293] localedata: Missing Minguo calendar support for TW locales
1906 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1907 tt_RU (Tatar) locale
1908 [24307] localedata: Update locale data to Unicode 12.0.0
1909 [24323] dynamic-link: dlopen should not be able open PIE objects
1910 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1911 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1912 tt_RU (Tatar) locale
1913 [24370] localedata: Add lang_name for tt_RU locale
1914 [24372] locale: Binary locale files are not architecture independent
1915 [24394] time: strptime %Ey mis-parses final year of era
1916 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1918 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1920 [24531] malloc: Malloc tunables give tcache assertion failures
1921 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1923 [24535] localedata: Update locale data to Unicode 12.1.0
1924 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1925 kernels and break testing
1926 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1927 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1928 [-Werror=format-overflow=]
1929 [24570] libc: alpha: compat msgctl uses __IPC_64
1930 [24584] locale: Data race in __wcsmbs_clone_conv
1931 [24588] stdio: Remove codecvt vtables from libio
1932 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1934 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1935 [24632] stdio: Old binaries which use freopen with default stdio handles
1937 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1939 [24652] localedata: szl_PL spelling correction
1940 [24695] nss: nss_db: calling getpwent after endpwent crashes
1941 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1942 in /etc/nsswitch.conf
1943 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1944 [24740] libc: getdents64 type confusion
1945 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1946 always implemented in the same library
1947 [24744] libc: Remove copy_file_range emulation
1948 [24757] malloc: memusagestat is linked against system libpthread
1949 [24794] libc: Partial test suite run builds corrupt test-in-container
1957 * The getcpu wrapper function has been added, which returns the currently
1958 used CPU and NUMA node. This function is Linux-specific.
1960 * A new convenience target has been added for distribution maintainers
1961 to build and install all locales as directories with files. The new
1962 target is run by issuing the following command in your build tree:
1963 'make localedata/install-locale-files', with an optional DESTDIR
1964 to set the install root if you wish to install into a non-default
1965 configured location.
1967 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1969 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1970 for _GNU_SOURCE, to match BSD environments.
1972 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1973 indicates that it will abort the transaction prior to entering the kernel
1974 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1975 suspended, and this caused some undefined side-effects issues by aborting
1976 transactions manually. Glibc avoided it by abort transactions manually on
1977 each syscall, but it lead to performance issues on newer kernels where the
1978 HTM state is saved and restore lazily (the state being saved even when the
1979 process actually does not use HTM).
1981 * The functions posix_spawn_file_actions_addchdir_np and
1982 posix_spawn_file_actions_addfchdir_np have been added, enabling
1983 posix_spawn and posix_spawnp to run the new process in a different
1984 directory. These functions are GNU extensions. The function
1985 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1988 * The popen and system do not run atfork handlers anymore (BZ#17490).
1989 Although it is a possible POSIX violation, the POSIX rationale in
1990 pthread_atfork documentation regarding atfork handlers is to handle
1991 inconsistent mutex state after a fork call in a multi-threaded process.
1992 In both popen and system there is no direct access to user-defined mutexes.
1994 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1995 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1997 - C-SKY ABIV2 soft-float little-endian
1998 - C-SKY ABIV2 hard-float little-endian
2000 * strftime's default formatting of a locale's alternative year (%Ey)
2001 has been changed to zero-pad the year to a minimum of two digits,
2002 like "%y". This improves the display of Japanese era years during
2003 the first nine years of a new era, and is expected to be harmless
2004 for all other locales (only Japanese locales regularly have
2005 alternative year numbers less than 10). Zero-padding can be
2006 overridden with the '_' or '-' flags (which are GNU extensions).
2008 * As a GNU extension, the '_' and '-' flags can now be applied to
2009 "%EY" to control how the year number is formatted; they have the
2010 same effect that they would on "%Ey".
2012 Deprecated and removed features, and other changes affecting compatibility:
2014 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2015 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2017 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2018 in <sys/procfs.h>, has been corrected to match the type actually used by
2019 the Linux kernel. This affects the size and layout of that structure on
2020 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2022 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2023 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2024 defined in <sys/procfs.h>, has been corrected to match the type actually
2025 used by the Linux kernel. This affects the size and layout of those
2028 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2029 meant to scan a string and allocate space for it with malloc, is now
2030 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2031 defined. This extension conflicts with C99's use of '%a' to scan a
2032 hexadecimal floating-point number, which is now available to programs
2033 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2035 POSIX.1-2008 includes the feature of allocating a buffer for string input
2036 with malloc, using the modifier letter 'm' instead. Programs using
2037 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2038 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2039 C99 '%a' no longer need to avoid _GNU_SOURCE.
2041 GCC's -Wformat warnings can detect most uses of this extension, as long
2042 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2043 __attribute__ ((format (scanf, ...))).
2045 Changes to build and runtime requirements:
2047 * Python 3.4 or later is required to build the GNU C Library.
2049 * On most architectures, GCC 5 or later is required to build the GNU C
2050 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2052 Older GCC versions and non-GNU compilers are still supported when
2053 compiling programs that use the GNU C Library.
2055 Security related changes:
2057 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2058 denial of service due to resource exhaustion when processing getaddrinfo
2059 calls with crafted host names. Reported by Guido Vranken.
2061 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2062 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2063 happened, accessing the 32-bit size_t value as the full 64-bit register
2064 in the assembly string/memory functions would cause a buffer overflow.
2065 Reported by H.J. Lu.
2067 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2068 addresses with arbitrary trailing characters, potentially leading to data
2069 or command injection issues in applications.
2071 The following bugs are resolved with this release:
2073 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2074 [10496] localedata: 12h time representation in multiple locales faulty
2075 [10797] localedata: it_IT locale numeric does not have a separator for
2077 [11319] libc: dprintf doesn't handle errors properly
2078 [16346] time: mktime: potentially unsafe use of localtime_offset
2079 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2081 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2082 posix_spawn_file_actions_addfchdir_np
2083 [17426] localedata: Indian locales: set the correct date format
2084 [17490] stdio: popen should not invoke atfork handlers
2085 [17783] libc: TIOCSER_TEMT conditions inconsistent
2086 [18040] regex: use-after-free in regexec/get_subexp
2087 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2088 [20018] network: getaddrinfo should reject IP addresses with trailing
2089 characters (CVE-2016-10739)
2090 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2091 [20271] libc: Missing "\n" in __libc_fatal calls
2092 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2093 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2094 pointer argument is non-NULL
2095 [21037] stdio: open_memstream and freopen
2096 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2097 [21716] time: Crash in glibc's mktime in low-memory situations
2098 [22834] stdio: Subprocess forked by popen may crash in Linux when
2099 multithreads call popen
2100 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2101 and pthread_create fails.
2102 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2103 [23125] libc: riscv64: endless loop when throwing an exception from a
2105 [23275] nptl: Race in pthread_mutex_lock while promoting to
2106 PTHREAD_MUTEX_ELISION_NP.
2107 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2109 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2111 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2113 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2114 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2116 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2117 [23521] nss: get_next_alias nss_files file stream leak
2118 [23538] nptl: Hang in pthread_cond_broadcast
2119 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2120 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2121 [23579] libc: Errors misreported in preadv2
2122 [23597] build: support/test-container.c doesn't work with different
2124 [23603] time: mktime signed integer overflow on large timestamps
2125 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2126 [23614] libc: powerpc: missing CFI register information in __mpn_*
2128 [23637] string: Generic strstr/strcasestr fails with huge needles
2129 [23640] libc: no way to easily clear FD_CLOEXEC in
2130 posix_spawn_file_actions_adddup2()
2131 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2133 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2135 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2136 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2137 bits/types/struct_rusage.h
2138 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2140 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2142 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2143 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2144 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2146 [23724] localedata: Albanian date formats are incorrect
2147 [23735] math: libnldbl_nonshared.a references internal libm symbols
2148 [23740] localedata: kl_GL: Month names and date formats need update
2149 [23744] regex: regex refactorings to remove BE, avoid duplication
2150 [23745] time: mktime fix for Gnulib + coreutils
2151 [23758] time: Improve the width of alternate representation for year in
2153 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2154 [23789] time: mktime does not set errno on failure
2155 [23791] localedata: Wrong monetary format for ca_ES locale
2156 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2157 [23794] locale: c16rtomb does not handle surrogate pairs
2158 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2159 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2160 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2161 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2162 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2163 [23862] libc: [sh] missing kernel-features.h undefines
2164 [23864] libc: [riscv] missing kernel-features.h undefines
2165 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2166 [23907] malloc: Incorrect double-free malloc tcache check disregards
2168 [23913] libc: off-by-one in function maybe_script_execute in
2169 sysdeps/posix/spawni.c
2170 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2171 [23923] locale: Add --no-hard-links option to localedef
2172 [23927] network: Linux if_nametoindex() does not close descriptor
2174 [23961] math: powf can overflow to inf without setting errno in non-
2175 nearest rounding mode
2176 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2177 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2178 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2179 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2180 [24011] localedata: Fixed small type in comment for locale bs_BA
2181 [24018] libc: gettext() may return NULL
2182 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2183 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2184 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2186 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2187 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2189 [24046] localedata: en_US locale doesn't define date_fmt
2190 [24063] manual: @var{errno} should be @code{errno}
2191 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2192 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2194 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2196 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2198 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2200 [24112] network: Do not send DNS queries for non-host names (where all
2201 answers will be rejected)
2202 [24130] libc: alpha __remqu corrupts $f3 register
2209 * The localization data for ISO 14651 is updated to match the 2016
2210 Edition 4 release of the standard, this matches data provided by
2211 Unicode 9.0.0. This update introduces significant improvements to the
2212 collation of Unicode characters. This release deviates slightly from
2213 the standard in that the collation element ordering for lowercase and
2214 uppercase LATIN script characters is adjusted to ensure that regular
2215 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2216 is not matched by [a-z]. With the update many locales have been
2217 updated to take advantage of the new collation information. The new
2218 collation information has increased the size of the compiled locale
2219 archive or binary locales.
2221 * The GNU C Library can now be compiled with support for Intel CET, AKA
2222 Intel Control-flow Enforcement Technology. When the library is built
2223 with --enable-cet, the resulting glibc is protected with indirect
2224 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2225 compatible with all existing executables and shared libraries. This
2226 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2227 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2228 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2229 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2230 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2231 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2234 * The GNU C Library now has correct support for ABSOLUTE symbols
2235 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2236 relocated incorrectly or in some cases discarded. The GNU linker can
2237 make use of the newer semantics, but it must communicate it to the
2238 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2239 field) to indicate such support is required.
2241 * Unicode 11.0.0 Support: Character encoding, character type info, and
2242 transliteration tables are all updated to Unicode 11.0.0, using
2243 generator scripts contributed by Mike FABIAN (Red Hat).
2245 * <math.h> functions that round their results to a narrower type are added
2246 from TS 18661-1:2014 and TS 18661-3:2015:
2248 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2249 fMxaddfNx functions.
2251 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2252 fMxsubfNx functions.
2254 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2255 fMxmulfNx functions.
2257 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2258 fMxdivfNx functions.
2260 * Two grammatical forms of month names are now supported for the following
2261 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2262 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2263 support two grammatical forms in abbreviated month names: Catalan, Greek,
2266 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2267 include the support for two grammatical forms of month names.
2269 * Building and running on GNU/Hurd systems now works without out-of-tree
2272 * The renameat2 function has been added, a variant of the renameat function
2273 which has a flags argument. If the flags are zero, the renameat2 function
2274 acts like renameat. If the flag is not zero and there is no kernel
2275 support for renameat2, the function will fail with an errno value of
2276 EINVAL. This is different from the existing gnulib function renameatu,
2277 which performs a plain rename operation in case of a RENAME_NOREPLACE
2278 flags and a non-existing destination (and therefore has a race condition
2279 that can clobber the destination inadvertently).
2281 * The statx function has been added, a variant of the fstatat64
2282 function with an additional flags argument. If there is no direct
2283 kernel support for statx, glibc provides basic stat support based on
2284 the fstatat64 function.
2286 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2287 library if installed. libidn2 version 2.0.5 or later is recommended. If
2288 libidn2 is not available, internationalized domain names are not encoded
2289 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2290 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2291 with an encoding error.) Flags which used to change the IDN encoding and
2292 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2293 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2294 deprecated. They no longer have any effect.
2296 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2297 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2298 range of ELF gABI expressions including such constructs as
2299 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2300 have been further restricted, and where in the past a dynamic string
2301 token sequence may have been interpreted as a literal string it will
2302 now cause a load failure. These load failures were always considered
2303 unspecified behaviour from the perspective of the dynamic loader, and
2304 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2305 results in a load failure now.
2307 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2308 implementation includes all the standard functions provided by
2311 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2312 thrd_detach, thrd_exit, and thrd_join for thread management.
2314 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2315 mtx_destroy for mutual exclusion.
2317 - call_once for function call synchronization.
2319 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2320 cnd_wait for conditional variables.
2322 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2324 Application developers must link against libpthread to use ISO C threads.
2326 Deprecated and removed features, and other changes affecting compatibility:
2328 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2329 installed. Software that was using either header should be updated to
2330 use standard <stdio.h> interfaces instead.
2332 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2333 This was never required by the C standard, and the macros just expanded
2334 to call alternative names for the same functions. If you hoped getc and
2335 putc would provide performance improvements over fgetc and fputc, instead
2336 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2337 necessary, flockfile and funlockfile.
2339 * All stdio functions now treat end-of-file as a sticky condition. If you
2340 read from a file until EOF, and then the file is enlarged by another
2341 process, you must call clearerr or another function with the same effect
2342 (e.g. fseek, rewind) before you can read the additional data. This
2343 corrects a longstanding C99 conformance bug. It is most likely to affect
2344 programs that use stdio to read interactive input from a terminal.
2347 * The macros 'major', 'minor', and 'makedev' are now only available from
2348 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2349 headers that happen to include <sys/types.h>. These macros are rarely
2350 used, not part of POSIX nor XSI, and their names frequently collide with
2351 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2352 further explanation.
2354 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2355 these macros should first include <sys/types.h>, and then include
2356 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2358 * The tilegx*-*-linux-gnu configurations are no longer supported.
2360 * The obsolete function ustat is no longer available to newly linked
2361 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2362 function has been deprecated in favor of fstatfs and statfs.
2364 * The obsolete function nfsservctl is no longer available to newly linked
2365 binaries. This function was specific to systems using the Linux kernel
2366 and could not usefully be used with the GNU C Library on systems with
2367 version 3.1 or later of the Linux kernel.
2369 * The obsolete function name llseek is no longer available to newly linked
2370 binaries. This function was specific to systems using the Linux kernel
2371 and was not declared in a header. Programs should use the lseek64 name
2372 for this function instead.
2374 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2375 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2376 previously selected by them is now always enabled.
2378 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2379 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2380 restriction (rejecting '_' in host names, among other things) has been
2381 removed, for increased compatibility with non-IDN name resolution.
2383 * The fcntl function now have a Long File Support variant named fcntl64. It
2384 is added to fix some Linux Open File Description (OFD) locks usage on non
2385 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2386 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2387 locks act as a cancellation entrypoint.
2389 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2390 ecb_crypt, and des_setparity are no longer available to newly linked
2391 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2392 longer installed. These functions encrypted and decrypted data with the
2393 DES block cipher, which is no longer considered secure. Software that
2394 still uses these functions should switch to a modern cryptography library,
2397 * Reflecting the removal of the encrypt and setkey functions above, the
2398 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2399 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2402 * The obsolete function fcrypt is no longer available to newly linked
2403 binaries. It was just another name for the standard function crypt,
2404 and it has not appeared in any header file in many years.
2406 * We have tentative plans to hand off maintenance of the passphrase-hashing
2407 library, libcrypt, to a separate development project that will, we hope,
2408 keep up better with new passphrase-hashing algorithms. We will continue
2409 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2410 'crypt_r' should not need to change at all; however, distributions will
2411 need to install <crypt.h> and libcrypt from a separate project.
2413 In this release, if the configure option --disable-crypt is used, glibc
2414 will not install <crypt.h> or libcrypt, making room for the separate
2415 project's versions of these files. The plan is to make this the default
2416 behavior in a future release.
2418 Changes to build and runtime requirements:
2420 GNU make 4.0 or later is now required to build glibc.
2422 Security related changes:
2424 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2425 been fixed by removing the glibc-internal IDNA implementation and using
2426 the system-provided libidn2 library instead. Originally reported by Hanno
2427 Böck and Christian Weisgerber.
2429 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2430 architecture could corrupt memory. Reported by Max Horn.
2432 CVE-2018-11236: Very long pathname arguments to realpath function could
2433 result in an integer overflow and buffer overflow. Reported by Alexey
2436 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2437 architecture could write beyond the target buffer, resulting in a buffer
2438 overflow. Reported by Andreas Schwab.
2440 The following bugs are resolved with this release:
2442 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2443 [6889] manual: 'PWD' mentioned but not specified
2444 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2445 when __WORDSIZE != 64
2446 [13762] regex: re_search etc. should return -2 on memory exhaustion
2447 [13888] build: /tmp usage during testing
2448 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2449 [14092] nptl: Support C11 threads
2450 [14095] localedata: Review / update collation data from Unicode / ISO
2452 [14508] libc: -Wformat warnings
2453 [14553] libc: Namespace pollution loff_t in sys/types.h
2454 [14890] libc: Make NT_PRFPREG canonical.
2455 [15105] libc: Extra PLT references with -Os
2456 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2458 [16335] manual: Feature test macro documentation incomplete and out of
2460 [16552] libc: Unify umount implementations in terms of umount2
2461 [17082] libc: htons et al.: statement-expressions prevent use on global
2462 scope with -O1 and higher
2463 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2464 [17438] localedata: pt_BR: wrong d_fmt delimiter
2465 [17662] libc: please implement binding for the new renameat2 syscall
2466 [17721] libc: __restrict defined as /* Ignore */ even in c11
2467 [17979] libc: inconsistency between uchar.h and stdint.h
2468 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2469 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2470 horrible machine code)
2471 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2473 [18471] libc: llseek should be a compat symbol
2474 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2476 [18991] nss: nss_files skips large entry in database
2477 [19239] libc: Including stdlib.h ends up with macros major and minor being
2479 [19463] libc: linknamespace failures when compiled with -Os
2480 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2481 [19527] locale: Normalized charset name not recognized by setlocale
2482 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2483 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2485 [19728] network: out of bounds stack read in libidn function
2486 idna_to_ascii_4i (CVE-2016-6261)
2487 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2488 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2489 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2491 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2492 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2493 [20419] dynamic-link: files with large allocated notes crash in
2495 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2496 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2497 [20980] manual: CFLAGS environment variable replaces vital options
2498 [21163] regex: Assertion failure in pop_fail_stack when executing a
2499 malformed regexp (CVE-2015-8985)
2500 [21234] manual: use of CFLAGS makes glibc detect no optimization
2501 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2502 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2503 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2504 [21508] locale: intl/tst-gettext failure with latest msgfmt
2505 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2506 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2507 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2509 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2511 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2512 [22247] network: Integer overflow in the decode_digit function in
2513 puny_decode.c in libidn (CVE-2017-14062)
2514 [22342] nscd: NSCD not properly caching netgroup
2515 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2516 [22550] localedata: es_ES locale (and other es_* locales): collation
2517 should treat ñ as a primary different character, sync the collation
2518 for Spanish with CLDR
2519 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2520 by gcc configured with --enable-default-pie
2521 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2522 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2523 crossing 2GB threshold (CVE-2017-18269)
2524 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2526 [22735] time: Misleading typo in time.h source comment regarding
2528 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2529 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2530 `__assert_perror_fail ()' to `__assert_fail_base ()'
2531 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2533 [22786] libc: Stack buffer overflow in realpath() if input size is close
2534 to SSIZE_MAX (CVE-2018-11236)
2535 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2536 through an absolute DT_NEEDED path
2537 [22792] build: tcb-offsets.h dependency dropped
2538 [22797] libc: pkey_get() uses non-reserved name of argument
2539 [22807] libc: PTRACE_* constants missing for powerpc
2540 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2541 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2542 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2543 [22848] localedata: ca_ES: update date definitions from CLDR
2544 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2545 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2546 [22896] localedata: Update locale data for an_ES
2547 [22902] math: float128 test failures with GCC 8
2548 [22918] libc: multiple common of `__nss_shadow_database'
2549 [22919] libc: sparc32: backtrace yields infinite backtrace with
2551 [22926] libc: FTBFS on powerpcspe
2552 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2554 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2555 [22947] libc: FAIL: misc/tst-preadvwritev2
2556 [22963] localedata: cs_CZ: Add alternative month names
2557 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2558 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2559 [22998] dynamic-link: execstack tests are disabled when SELinux is
2561 [23005] network: Crash in __res_context_send after memory allocation
2563 [23007] math: strtod cannot handle -nan
2564 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2565 [23036] regex: regex equivalence class regression
2566 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2567 [23069] libc: sigaction broken on riscv64-linux-gnu
2568 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2569 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2570 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2571 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2572 and libc build with -Os)
2573 [23140] localedata: More languages need two forms of month names
2574 [23145] libc: _init/_fini aren't marked as hidden
2575 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2576 [23171] math: C++ iseqsig for long double converts arguments to double
2577 [23178] nscd: sudo will fail when it is run in concurrent with commands
2578 that changes /etc/passwd
2579 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2581 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2582 [23208] localedata: New locale - Lower Sorbian (dsb)
2583 [23233] regex: Memory leak in build_charclass_op function in file
2585 [23236] stdio: Harden function pointers in _IO_str_fields
2586 [23250] nptl: Offset of __private_ss differs from GCC
2587 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2588 -mtune=generic -mfpmath=sse
2589 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2591 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2592 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2594 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2595 [23277] math: nan function should not have const attribute
2596 [23279] math: scanf and strtod wrong for some hex floating-point
2597 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2599 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2600 [23303] build: undefined reference to symbol
2601 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2602 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2604 [23313] stdio: libio vtables validation and standard file object
2606 [23329] libc: The __libc_freeres infrastructure is not properly run across
2608 [23349] libc: Various glibc headers no longer compatible with
2610 [23351] malloc: Remove unused code related to heap dumps and malloc
2612 [23363] stdio: stdio-common/tst-printf.c has non-free license
2613 [23396] regex: Regex equivalence regression in single-byte locales
2614 [23422] localedata: oc_FR: More updates of locale data
2615 [23442] build: New warning with GCC 8
2616 [23448] libc: Out of bounds access in IBM-1390 converter
2617 [23456] libc: Wrong index_cpu_LZCNT
2618 [23458] build: tst-get-cpu-features-static isn't added to tests
2619 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2621 [23467] dynamic-link: x86/CET: A property note parser bug
2628 * The GNU C Library can now be compiled with support for building static
2629 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2630 executables are like static executables but can be loaded at any address
2631 and provide additional security hardening benefits at the cost of some
2632 memory and performance. When the library is built with --enable-static-pie
2633 the resulting libc.a is usable with GCC 8 and above to create static PIE
2634 executables using the GCC option '-static-pie'. This feature is currently
2635 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2636 aarch64 with binutils 2.30 or later.
2638 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2639 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2642 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2644 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2646 * In order to support faster and safer process termination the malloc API
2647 family of functions will no longer print a failure address and stack
2648 backtrace after detecting heap corruption. The goal is to minimize the
2649 amount of work done after corruption is detected and to avoid potential
2650 security issues in continued process execution. Reducing shutdown time
2651 leads to lower overall process restart latency, so there is benefit both
2652 from a security and performance perspective.
2654 * The abort function terminates the process immediately, without flushing
2655 stdio streams. Previous glibc versions used to flush streams, resulting
2656 in deadlocks and further data corruption. This change also affects
2657 process aborts as the result of assertion failures.
2659 * On platforms where long double has the IEEE binary128 format (aarch64,
2660 alpha, mips64, riscv, s390 and sparc), the math library now implements
2661 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2662 These are the same interfaces added in version 2.26 for some platforms where
2663 this format is supported but is not the format of long double.
2665 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2666 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2667 implements interfaces for that type, as defined by ISO/IEC TS
2668 18661-3:2015. These are corresponding interfaces to those supported for
2671 * The math library now implements interfaces for the _Float32, _Float64 and
2672 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2673 corresponding interfaces to those supported for _Float128.
2675 * glibc now implements the memfd_create and mlock2 functions on Linux.
2677 * Support for memory protection keys was added. The <sys/mman.h> header now
2678 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2681 * The copy_file_range function was added.
2683 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2685 * The ldconfig utility now processes `include' directives using the C/POSIX
2686 collation ordering. Previous glibc versions used locale-specific
2687 ordering, the change might break systems that relied on that.
2689 * Support for two grammatical forms of month names has been added.
2690 In a call to strftime, the "%B" and "%b" format specifiers will now
2691 produce the grammatical form required when the month is used as part
2692 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2693 required when the month is named by itself. For instance, in Greek
2694 and in many Slavic and Baltic languages, "%B" will produce the month
2695 in genitive case, and "%OB" will produce the month in nominative case.
2697 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2698 are all valid and will all accept any known form of month
2699 name---standalone or complete, abbreviated or full. In a call to
2700 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2701 the strings used by "%B" and "%b", respectively. New query
2702 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2703 used by "%OB" and "%Ob", respectively.
2705 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2706 define the strings for %OB and %Ob, respectively; these have the
2707 same syntax as "mon" and "abmon". These arrays are optional; if they
2708 are not provided then they have the same content as "mon" and "abmon",
2711 These features are provided for locales which define "alt_mon" and/or
2712 "ab_alt_mon" in their locale source data. This release includes such
2713 alternative month name data for the following languages: Belarusian,
2714 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2716 This feature is currently a GNU extension, but it is expected to
2717 be added to the next revision of POSIX, and it is also already
2718 available on some BSD-derived operating systems.
2720 This feature will cause existing statically compiled applications
2721 to fail to load locales and fall back to the builtin C/POSIX locales.
2722 See notes below for other changes affecting compatibility.
2724 * Support for the RISC-V ISA running on Linux has been added. This port
2725 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2726 for the following ISA and ABI pairs:
2732 Deprecated and removed features, and other changes affecting compatibility:
2734 * Statically compiled applications attempting to load locales compiled for the
2735 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2736 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2737 support for two grammatical forms of the month names, also extends the locale
2738 data binary format. Static applications needing locale support must be
2739 recompiled to match the runtime and data they are deployed with. In some
2740 distributions there is an upgrade window where dynamically linked applications
2741 may use a new library but the old locale data and also fall back to the
2742 builtin C/POSIX locales; restarting the application process is sufficient to
2745 * Support for statically linked applications which call dlopen is deprecated
2746 and will be removed in a future version of glibc. Applications which call
2747 dlopen need to be linked dynamically instead.
2749 * Support for old programs which use internal stdio data structures and
2750 functions is deprecated. This includes programs which use the C++ streams
2751 provided by libstdc++ in GCC 2.95. Programs which use the internal
2752 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2753 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2754 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2755 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2756 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2757 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2758 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2759 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2760 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2761 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2762 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2763 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2764 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2765 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2766 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2767 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2768 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2769 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2770 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2771 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2772 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2773 future version of glibc. Unlike other symbol removals, these old
2774 applications will not be supported using compatibility symbols.
2776 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2777 defined by <sys/ptrace.h>.
2779 * libm no longer supports SVID error handling (calling a user-provided
2780 matherr function on error) or the _LIB_VERSION variable to control error
2781 handling. (SVID error handling and the _LIB_VERSION variable still work
2782 for binaries linked against older versions of the GNU C Library.) The
2783 libieee.a library is no longer provided. math.h no longer defines struct
2784 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2785 TLOSS, PLOSS and HUGE.
2787 * The libm functions pow10, pow10f and pow10l are no longer supported for
2788 new programs. Programs should use the standard names exp10, exp10f and
2789 exp10l for these functions instead.
2791 * The mcontext_t type is no longer the same as struct sigcontext. On
2792 platforms where it was previously the same, this changes the C++ name
2793 mangling for interfaces involving this type.
2795 * The add-ons mechanism for building additional packages at the same time as
2796 glibc has been removed. The --enable-add-ons configure option is now
2799 * The --without-fp configure option is now ignored. Whether hardware
2800 floating-point instructions are used is now configured based on whether
2801 the compiler used at configure time (without any options implied by a
2802 --with-cpu= configure option) uses such instructions.
2804 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2805 the specified string can be parsed as a domain name.
2807 * In the malloc_info output, the <heap> element may contain another <aspace>
2808 element, "subheaps", which contains the number of sub-heaps.
2810 * The libresolv function p_secstodate is no longer supported for new
2813 * The tilepro-*-linux-gnu configuration is no longer supported.
2815 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2816 and will be removed in a future release. Software that is still using
2817 either header should be updated to use standard <stdio.h> interfaces
2820 libio.h was originally the header for a set of supported GNU extensions,
2821 but they have not been maintained as such in many years, they are now
2822 standing in the way of improvements to stdio, and we don't think there are
2823 any remaining external users. _G_config.h was never intended for public
2824 use, but predates the bits convention.
2826 Changes to build and runtime requirements:
2828 * bison version 2.7 or later is required to generate code in the 'intl'
2831 Security related changes:
2833 CVE-2009-5064: The ldd script would sometimes run the program under
2834 examination directly, without preventing code execution through the
2835 dynamic linker. (The glibc project disputes that this is a security
2836 vulnerability; only trusted binaries must be examined using the ldd
2839 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2840 suffered from a one-byte overflow during ~ operator processing (either
2841 on the stack or the heap, depending on the length of the user name).
2842 Reported by Tim Rühsen.
2844 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2845 would sometimes fail to free memory allocated during ~ operator
2846 processing, leading to a memory leak and, potentially, to a denial
2849 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2850 without GLOB_NOESCAPE, could write past the end of a buffer while
2851 unescaping user names. Reported by Tim Rühsen.
2853 CVE-2017-17426: The malloc function, when called with an object size near
2854 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2855 instead of NULL. This was a regression introduced with the new malloc
2856 thread cache in glibc 2.26. Reported by Iain Buclaw.
2858 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2859 to the allocation of too much memory. (This is not a security bug per se,
2860 it is mentioned here only because of the CVE assignment.) Reported by
2863 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2864 of the number of search path components. (This is not a security
2865 vulnerability per se because no trust boundary is crossed if the fix for
2866 CVE-2017-1000366 has been applied, but it is mentioned here only because
2867 of the CVE assignment.) Reported by Qualys.
2869 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2870 for AT_SECURE or SUID binaries could be used to load libraries from the
2873 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2874 succeeds without returning an absolute path due to unexpected behaviour
2875 of the Linux kernel getcwd syscall. Reported by halfdog.
2877 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2878 an object size near the value of SIZE_MAX, would return a pointer to a
2879 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2881 CVE-2018-6551: The malloc function, when called with an object size near
2882 the value of SIZE_MAX, would return a pointer to a buffer which is too
2883 small, instead of NULL.
2885 The following bugs are resolved with this release:
2887 [866] glob: glob should match dangling symlinks
2888 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2889 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2891 [5997] math: Very slow execution of sinf function
2892 [10580] localedata: hr_HR: updated locale
2893 [10871] locale: 'mon' array should contain both nominative and genitive
2895 [12349] localedata: eu_ES: incorrect thousands separator
2896 [13605] localedata: shn_MM: new Shan locale
2897 [13805] localedata: ru_RU: currency should use ',' as radix point
2898 [13953] localedata: km_KH: locale update
2899 [13994] localedata: mjw_IN: new locale
2900 [14121] build: make writes .mo files in po directory
2901 [14333] libc: Fix the race between atexit() and exit()
2902 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2903 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2905 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2906 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2907 width Latin characters
2908 [15332] localedata: es_CU: locale update
2909 [15436] stdio: Don't close or flush stdio streams on abort
2910 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2912 [16148] localedata: ca_ES: incorrect thousands separator
2913 [16750] dynamic-link: ldd should not try to execute the binaries
2915 [16777] localedata: pl_PL: incorrect thousands separator in locale
2916 [16905] localedata: hanzi: new collation
2917 [17563] localedata: cmn_TW: add hanzi collation
2918 [17750] localedata: wrong collation order of diacritics in most locales
2919 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2921 [17956] build: Build fails on missing definitions from header file
2922 nss/nss.h when Mozilla NSS is used for cryptography
2923 [18203] libc: realpath() does not handle unreachable paths correctly
2924 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2925 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2926 [18822] libc: Internal functions are called via PLT
2927 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2928 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2929 [19574] libc: glibc should support building static PIE binaries
2930 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2932 [19971] glob: glob: Do not skip entries with zero d_ino values
2933 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2934 [20008] localedata: km_KH: convert to translit_neutral
2935 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2936 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2937 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2938 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2939 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2941 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2942 they're set, wrong errors returned by gaih_inet when lookup functions
2944 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2945 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2947 [20952] localedata: yuw_PG: new locale
2948 [21084] localedata: charmaps/IBM858: new codepage
2949 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2950 [21242] libc: assert gives pedantic warning in old gcc versions
2951 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2952 __regcall calling convention
2953 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2954 [21326] libc: C99 functions are not declared for C++11 and later if
2955 _GNU_SOURCE is not predefined by g++
2956 [21457] libc: sys/ucontext.h namespace
2957 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2958 [21660] math: GCC fails to compile a formula with tgmath.h
2959 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2960 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2961 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2962 [21684] math: tgmath.h handling of complex integers
2963 [21685] math: tgmath.h handling of bit-fields
2964 [21686] math: tgmath.h handling of __int128
2965 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2967 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2969 [21750] localedata: column width of characters incompatible with classical
2971 [21754] malloc: malloc: Perform as little work as possible after heap
2972 consistency check failures
2973 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2974 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2975 [21791] string: Unused XXX_chk_XXX functions in libc.a
2976 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2978 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2980 [21845] localedata: Added new Locale bho_NP
2981 [21853] localedata: Fix abday Which looks same as day in zh_SG
2982 [21854] localedata: Added New Locale en_SC
2983 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2984 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2985 _dl_runtime_resolve_avx_slow
2986 [21885] network: getaddrinfo: gethosts does not release resolver context
2987 on memory allocation failure
2988 [21899] libc: XPG4.2 sigaction namespace
2989 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2991 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2993 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2994 errno value, causing getaddrinfo to fail
2995 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2996 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2997 instead of EAI_NODATA
2998 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2999 constant PTRACE_SEIZE_DEVEL
3000 [21930] math: C-only gcc builtins used in <math.h> isinf
3001 [21932] network: Unpaired __resolv_context_get in generic get*_r
3003 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3004 [21944] libc: sigval namespace
3005 [21951] localedata: Update hanzi collation by stroke
3006 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3007 sysdeps/x86_64/fpu/e_expf.S
3008 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3009 allocation in syscall loops)
3010 [21959] localedata: Fix Country name for xh_ZA
3011 [21960] localedata: Fix abmon for bem_ZM
3012 [21966] math: AVX2 mathvec functions use FMA without checking
3013 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3014 [21971] localedata: Added New Locale for mfe_MU
3015 [21972] libc: assert macro requires operator== (int) for its argument type
3016 [21973] math: [sparc] libm missing sqrtl compat symbol
3017 [21974] libc: Remove __bb_init_func and __bb_exit_func
3018 [21982] string: stratcliff.c: error: assuming signed overflow does not
3020 [21986] stdio: __guess_grouping is called incorrectly
3021 [21987] math: [sparc32] wrong bits/long-double.h installed
3022 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3024 [22022] localedata: Missing country_name for mni_IN
3025 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3027 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3029 [22026] locale: iconv_open: heap overflow on gconv_init failure
3030 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3031 [22035] math: [m68k] bits/math-inline.h macro namespace
3032 [22038] localedata: Fix abbreviated weeks and months for Somali
3033 [22044] localedata: Remove redundant data for Limburgish Language
3034 [22050] malloc: Linking with -lmcheck does not hook
3035 __malloc_initialize_hook correctly
3036 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3037 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3038 [22070] localedata: charmaps/UTF-8: wcwidth for
3039 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3040 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3041 Jungseong and Jongseong) should be 0
3042 [22078] nss: nss_files performance issue in multi mode
3043 [22082] math: bits/math-finite.h exp10 condition
3044 [22086] libc: pcprofiledump incorrect cross-endian condition
3045 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3046 [22095] network: Name server address allocation memory leak in resolv.conf
3048 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3050 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3051 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3053 [22111] malloc: malloc: per thread cache is not returned when thread exits
3054 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3055 [22134] libc: [linux] implement fexecve with execveat
3056 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3058 [22145] libc: ttyname() gives up too early in the face of namespaces
3059 [22146] math: C++ build issue with float128 on x86_64
3060 [22153] nptl: nptl: save error code before process termination
3061 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3062 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3063 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3064 [22165] libc: [hppa] Text relocations in libc.so
3065 [22180] libc: destructor registered via __cxa_atexit is called twice
3066 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3067 symlinks") cause "make" segfaults
3068 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3070 [22207] libc: FAIL: stdlib/test-atexit-race
3071 [22225] math: nearbyint arithmetic moved before feholdexcept
3072 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3073 [22235] math: iscanonical in C++ and float128
3074 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3075 the svid compat wrapper
3076 [22244] math: ynf and yn are wrong without the svid compat wrapper
3077 [22273] libc: Improper assert in Linux posix_spawn implementation
3078 [22284] libc: -pg -pie doesn't work
3079 [22292] locale: localedef exits with error 4 when it should be error 1
3080 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3081 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3083 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3084 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3086 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3087 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3088 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3089 [22322] libc: [mips64] wrong bits/long-double.h installed
3090 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3091 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3093 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3094 [22343] malloc: Integer overflow in posix_memalign
3095 [22347] libc: getrandom() returns the number of bytes that were copied to
3096 the buffer even though the comments say "Return 0 on success and -1 on
3098 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3099 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3101 [22370] dynamic-link: Incorrect note padding check
3102 [22375] libc: malloc returns pointer from tcache_get when should return
3103 NULL (CVE-2017-17426)
3104 [22377] math: iseqsig, float128 and C++
3105 [22382] localedata: Error in tpi_PG locale
3106 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3107 inside the ASCII printable range
3108 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3110 [22403] localedata: Slash needs escaping in some locales
3111 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3112 [22409] network: res_hnok does not accept some host names used on the
3114 [22412] network: res_dnok, res_hnok should perform syntax checks
3115 [22413] network: ns_name_pton ignores syntactically invalid trailing
3117 [22415] stdio: setvbuf can lead to invalid free/segfault
3118 [22432] build: Non-deterministic build
3119 [22439] malloc: malloc_info should compute summary statistics for all sub-
3121 [22442] network: if_nametoindex could report index for the wrong
3122 networking interface
3123 [22446] build: aliasing violation calling readlink in handle_request
3124 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3125 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3126 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3127 __nscd_hash/__nss_hash
3128 [22463] network: p_secstodate overflow handling
3129 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3130 [22478] libc: sigwait can fail with EINTR
3131 [22505] libc: ldconfig processes include directive in locale-specific
3133 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3134 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3135 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3136 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3137 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3138 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3139 same as for Croatian
3140 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3141 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3142 [22577] libc: missing newline after "cannot allocate TLS data structures
3144 [22588] manual: manual/conf.texi: missing underscore in front of
3146 [22593] math: nextafter and nexttoward are declared with const attribute
3147 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3148 [22603] string: ia64 memchr overflows internal pointer check
3149 [22605] libc: SH clone does not set the exit code correctly
3150 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3152 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3153 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3154 modified in case of success
3155 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3156 [22615] manual: manual: ambiguous wording about errno value in case of
3158 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3160 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3161 binaries or if /proc is not mounted (CVE-2017-16997)
3162 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3163 [22630] build: $(no-pie-ldflag) is no longer effective
3164 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3165 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3166 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3167 [22637] nptl: guard size is subtracted from thread stack size instead of
3169 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3170 [22657] localedata: hu_HU: Avoid double space in date
3171 [22660] math: fmax, fmin sNaN handling on alpha
3172 [22664] libc: New warning of GCC8
3173 [22665] math: alpha: ceil and floor raise inexact exceptions
3174 [22666] math: alpha: trunc raise inexact exceptions
3175 [22667] libc: makecontext lacks stack alignment on i386
3176 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3177 [22679] libc: getcwd(3) can succeed without returning an absolute path
3179 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3180 elision and tunables
3181 [22687] math: [powerpc-nofpu] complex long double functions spurious
3183 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3184 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3185 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3187 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3188 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3190 [22701] nis: Incomplete removal of libnsl
3191 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3192 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3193 [22715] dynamic-link: FAIL: elf/tst-audit10
3194 [22719] libc: Backtrace tests fail on hppa
3195 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3196 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3197 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3198 before the first call to crypt_r () in crypt/badsalttest.c
3205 * A per-thread cache has been added to malloc. Access to the cache requires
3206 no locks and therefore significantly accelerates the fast path to allocate
3207 and free small amounts of memory. Refilling an empty cache requires locking
3208 the underlying arena. Performance measurements show significant gains in a
3209 wide variety of user workloads. Workloads were captured using a special
3210 instrumented malloc and analyzed with a malloc simulator. Contributed by
3211 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3213 * Unicode 10.0.0 Support: Character encoding, character type info, and
3214 transliteration tables are all updated to Unicode 10.0.0, using
3215 generator scripts contributed by Mike FABIAN (Red Hat).
3216 These updates cause user visible changes, especially the changes in
3217 wcwidth for many emoji characters cause problems when emoji sequences
3218 are rendered with pango, see for example:
3219 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3221 * Collation of Hungarian has been overhauled and is now consistent with "The
3222 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3225 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3227 - The GNU C Library will now detect when /etc/resolv.conf has been
3228 modified and reload the changed configuration. The new resolver option
3229 “no-reload” (RES_NORELOAD) disables this behavior.
3231 - The GNU C Library now supports an arbitrary number of search domains
3232 (configured using the “search” directive in /etc/resolv.conf);
3233 previously, there was a hard limit of six domains. For backward
3234 compatibility, applications that directly modify the ‘_res’ global
3235 object are still limited to six search domains.
3237 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3238 Library will now randomly pick a name server from the configuration as a
3239 starting point. (Previously, the second name server was always used.)
3241 * The tunables feature is now enabled by default. This allows users to tweak
3242 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3244 * New function reallocarray, which resizes an allocated block (like realloc)
3245 to the product of two sizes, with a guaranteed clean failure upon integer
3246 overflow in the multiplication. Originally from OpenBSD, contributed by
3247 Dennis Wölfing and Rüdiger Sonderfeld.
3249 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3250 These are extended versions of preadv and pwritev, respectively, taking an
3251 additional flags argument. The set of supported flags depends on the
3252 running kernel; full support currently requires kernel 4.7 or later.
3254 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3255 create a new session ID for the spawned process. This feature is
3256 scheduled to be added to the next major revision of POSIX; for the time
3257 being, it is available under _GNU_SOURCE.
3259 * errno.h is now safe to use from C-preprocessed assembly language on all
3260 supported operating systems. In this context, it will only define the
3261 Exxxx constants, as preprocessor macros expanding to integer literals.
3263 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3264 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3265 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3266 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3268 To compile programs that use this feature, the compiler must support
3269 128-bit floating point with the type name _Float128 (as defined by TS
3270 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3271 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3272 must be defined to make the new interfaces visible.
3274 The new functions and macros correspond to those present for other
3275 floating-point types (except for a few obsolescent interfaces not
3276 supported for the new type), with F128 or f128 suffixes; for example,
3277 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3278 printf or scanf formats for the new type; the strfromf128 and strtof128
3279 interfaces should be used instead.
3281 Deprecated and removed features, and other changes affecting compatibility:
3283 * The synchronization that pthread_spin_unlock performs has been changed to
3284 now be equivalent to a C11 atomic store with release memory order to the
3285 spin lock's memory location. Previously, several (but not all)
3286 architectures used stronger synchronization (e.g., containing what is
3287 often called a full barrier). This change can improve performance, but
3288 may affect odd fringe uses of spin locks that depend on the previous
3289 behavior (e.g., using spin locks as atomic variables to try to implement
3290 Dekker's mutual exclusion algorithm).
3292 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3295 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3296 will only be built and installed when the GNU C Library is configured with
3297 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3298 as TIRPC or rpcsvc-proto, to be used.
3300 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3301 libnss_compat, are deprecated, and will not be built or installed by
3304 The NIS(+) support library, libnsl, is also deprecated. By default, a
3305 compatibility shared library will be built and installed, but not headers
3306 or development libraries. Only a few NIS-related programs require this
3307 library. (In particular, the GNU C Library has never required programs
3308 that use 'gethostbyname' to be linked with libnsl.)
3310 Replacement implementations based on TIRPC, which additionally support
3311 IPv6, are available from <https://github.com/thkukuk/>. The configure
3312 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3313 name service modules, to be built and installed.
3315 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3316 support is enabled, the configured recursive resolver must support EDNS.
3317 (Responding to EDNS-enabled queries with responses which are not
3318 EDNS-enabled is fine, but FORMERR responses are not.)
3320 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3321 servers have not supported this opcode for a long time.
3323 * The _res_opcodes variable has been removed from libresolv. It had been
3324 exported by accident.
3326 * <string.h> no longer includes inline versions of any string functions,
3327 as this kind of optimization is better done by the compiler. The macros
3328 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3330 * The nonstandard header <xlocale.h> has been removed. Most programs should
3331 use <locale.h> instead. If you have a specific need for the definition of
3332 locale_t with no other declarations, please contact
3333 libc-alpha@sourceware.org and explain.
3335 * The obsolete header <sys/ultrasound.h> has been removed.
3337 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3339 * The obsolete function cfree has been removed. Applications should use
3342 * The stack_t type no longer has the name struct sigaltstack. This changes
3343 the C++ name mangling for interfaces involving this type.
3345 * The ucontext_t type no longer has the name struct ucontext. This changes
3346 the C++ name mangling for interfaces involving this type.
3348 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3349 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3350 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3351 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3352 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3353 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3354 fpregset_t type no longer has the name struct fpu. This changes the C++
3355 name mangling for interfaces involving those types.
3357 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3358 synced with the kernel:
3360 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3361 are not supported on this architecture and have been removed.
3363 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3364 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3365 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3367 Programs that assume the GET/SETREGS ptrace requests are universally
3368 available will now fail to build, instead of malfunctioning at runtime.
3370 Changes to build and runtime requirements:
3372 * Linux kernel 3.2 or later is required at runtime, on all architectures
3373 supported by that kernel. (This is a change from version 2.25 only for
3376 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3378 * On most architectures, GCC 4.9 or later is required to build the GNU C
3379 Library. On powerpc64le, GCC 6.2 or later is required.
3381 Older GCC versions and non-GNU compilers are still supported when
3382 compiling programs that use the GNU C Library. (We do not know exactly
3383 how old, and some GNU extensions to C may be _de facto_ required. If you
3384 are interested in helping us make this statement less vague, please
3385 contact libc-alpha@sourceware.org.)
3387 Security related changes:
3389 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3390 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3392 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3393 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3395 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3396 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3399 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3400 fixed (CVE-2017-12133).
3402 The following bugs are resolved with this release:
3404 [984] network: Respond to changed resolv.conf in gethostbyname
3405 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3406 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3408 [12189] libc: __stack_chk_fail should not attempt a backtrace
3410 [14096] time: Race condition on timezone/tst-timezone.out
3411 [14172] localedata: az_IR: new locale
3412 [14995] build: glibc fails to build if gold is the default linker, even if
3414 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3415 [16637] network: inet_pton function is accepting IPv6 with bad format
3416 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3417 x86 and other generic code
3418 [16875] localedata: ko_KR: fix lang_name
3419 [17225] localedata: ar_SY: localized month names for May and June are
3421 [17297] localedata: da_DK: wrong date_fmt string
3422 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3423 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3424 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3425 [19066] localedata: ar_SA abbreviated day and month names are in English
3426 [19569] network: resolv: Support an arbitrary number of search domains
3427 [19570] network: Implement random DNS server selection in the stub
3429 [19838] locale: localedef fails on PA-RISC
3430 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3431 order of 0D36 and 0D37
3432 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3434 [20098] libc: FAIL: debug/backtrace-tst on hppa
3435 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3437 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3439 [20313] localedata: Update locale data to Unicode 9.0
3440 [20424] manual: Document how to provide a malloc replacement
3441 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3443 [20686] locale: Add el_GR@euro to SUPPORTED.
3444 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3445 failures consistently
3446 [21015] dynamic-link: Document and fix --enable-bind-now
3447 [21016] nptl: pthread_cond support is broken on hppa
3448 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3449 frame-pointer on i386
3450 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3452 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3453 [21088] libc: Build fails with --enable-static-nss
3454 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3455 generic c code is used
3456 [21109] libc: Tunables broken on big-endian
3457 [21112] math: powf has large ulp errors with base close to 1 and exponent
3459 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3461 [21120] malloc: glibc malloc is incompatible with GCC 7
3462 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3464 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3465 (-0.0) when linking with -lieee
3466 [21171] math: log10, log2 and lgamma return incorrect results
3467 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3468 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3469 [21207] localedata: ce_RU: update weekdays from CLDR
3470 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3471 [21217] localedata: Update months from CLDR-31
3472 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3473 [21243] libc: support_delete_temp_file should issue warning for failed
3475 [21244] libc: support resolv_test_start() socket fd close should be
3477 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3478 new posix_spawn implementation
3479 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3480 leads to lower CPU frequency
3481 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3482 [21261] libc: [sparc64] bits/setjmp.h namespace
3483 [21267] network: [mips] bits/socket.h IOC* namespace
3484 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3485 [21270] libc: mmap64 silently truncates large offset values
3486 [21275] libc: posix_spawn always crashes on ia64 now
3487 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3488 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3489 [21289] libc: Incorrect declaration for 32-bit platforms with
3490 _FILE_OFFSET_BITS=64 causes build error
3491 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3492 not support gethostbyname4_r
3493 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3495 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3497 [21340] libc: Support POSIX_SPAWN_SETSID
3498 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3499 [21359] network: ns_name_pack needs additional byte in destination buffer
3500 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3501 against fragmentation attacks (CVE-2017-12132)
3502 [21369] network: resolv: Remove EDNS fallback
3503 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3505 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3506 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3507 [21393] stdio: Missing dup3 error check in freopen, freopen64
3508 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3509 [21399] localedata: Bad description for U00EC in
3510 localedata/charmaps/CP1254
3511 [21411] malloc: realloc documentation error
3512 [21426] network: sys/socket.h uio.h namespace
3513 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3514 [21445] libc: signal.h bsd_signal namespace
3515 [21455] network: Network headers stdint.h namespace
3516 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3518 [21475] network: resolv: Overlong search path is truncated mid-label
3519 [21511] libc: sigstack namespace
3520 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3521 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3522 bits/syscall.h: No such file or directory
3523 [21517] libc: struct sigaltstack namespace
3524 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3525 [21533] localedata: Update locale data to Unicode 10.0
3527 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3528 junk at end of line, first unrecognized character is `@'
3529 [21538] libc: SIG_HOLD missing for XPG4
3530 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3531 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3532 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3533 [21543] libc: sigevent namespace
3534 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3535 size for general purpose registers in mcontext_t structure
3536 [21550] libc: sigwait namespace
3537 [21552] libc: XPG4 bsd_signal namespace
3538 [21554] libc: sigpause namespace
3539 [21560] libc: sys/wait.h signal.h namespace
3540 [21561] libc: waitid namespace
3541 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3542 '/usr/include/stdlib.h': Permission denied
3543 [21575] libc: sys/wait.h missing struct rusage definition
3544 [21584] libc: sigaltstack etc namespace
3545 [21597] libc: siginterrupt namespace
3546 [21607] math: hppa: FAIL: math/test-tgmath
3547 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3549 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3550 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3551 stack and heap (CVE-2017-1000366)
3552 [21625] libc: wait3 namespace
3553 [21654] nss: Incorrect pointer alignment in NSS group merge result
3555 [21657] network: Parse interface zone id for node-local multicast
3556 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3558 [21666] libc: .symver is used on common symbol
3559 [21668] network: resolv: res_init cross-thread broadcast introduces race
3561 [21687] math: tgmath.h totalorder, totalordermag return type
3562 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3564 [21696] libc: Incorrect assumption of of __cpu_mask in
3565 posix/sched_cpucount.c
3566 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3567 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3569 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3570 leading to relocation crash
3571 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3572 `resolv_conf_matches (resp, conf)' failed.
3573 [21710] localedata: Added Samoan language locale for Samoa
3574 [21711] localedata: Pashto yesstr/nostr locale are missing
3575 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3576 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3577 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3578 [21723] localedata: yesstr/nostr missing for Chinese language locale
3579 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3581 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3583 [21728] localedata: New Locale for Tongan language
3584 [21729] localedata: incorrect LC_NAME fields for hi_IN
3585 [21733] localedata: yesstr and nostr are missing for zh_HK
3586 [21734] localedata: Missing yesstr and nostr are for kw_GB
3587 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3588 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3589 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3590 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3592 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3594 [21749] localedata: Wrong abbreviated day name (“abday”) for
3596 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3597 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3598 [21759] localedata: missing yesstr and nostr for Tigrinya
3599 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3600 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3601 [21767] localedata: Missing Bislama locales
3602 [21768] localedata: Missing yesstr and nostr for aa_ET
3603 [21770] localedata: Missing Field in li_NL
3604 [21778] nptl: Robust mutex may deadlock
3605 [21779] libc: MicroBlaze segfaults when loading libpthread
3606 [21783] localedata: Fix int_select international_call_prefixes
3607 [21784] localedata: Inconsistency in country_isbn
3608 [21788] localedata: Missing Country Postal Abbreviations
3609 [21794] localedata: Added-country_isbn-for-Italy
3610 [21795] localedata: Add/Fix country_isbn for France
3611 [21796] localedata: Added country_isbn for Republic of Korea
3612 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3613 [21799] localedata: Added int_select international_call_prefixes
3614 [21801] localedata: Added int_select international_call_prefixes
3615 [21804] nptl: Double semicolon in thread-shared-types.h
3616 [21807] localedata: LC_ADDRESS fix for pap_CW
3617 [21808] localedata: Fix LC_ADDRESS for pap_AW
3618 [21821] localedata: Added country_name in mai_IN
3619 [21822] localedata: Fix LC_TIME for mai_IN
3620 [21823] localedata: missing yesstr, nostr for sa_IN
3621 [21825] localedata: Fix name_mrs for mag_IN
3622 [21828] localedata: 2.26 changelog should mention user visible changes
3624 [21835] localedata: Added Maithili language locale for Nepal
3625 [21838] localedata: Removed redundant data for the_NP
3626 [21839] localedata: Fix LC_MONETARY for ta_LK
3627 [21844] localedata: Fix Latin characters and Months Sequence.
3628 [21848] localedata: Fix mai_NP Title Name
3633 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3634 24731-2:2010, is supported to enable declarations of functions from that
3635 TR. Note that not all functions from that TR are supported by the GNU C
3638 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3639 18661-1:2014, is supported to enable declarations of functions and macros
3640 from that TS. Note that not all features from that TS are supported by
3643 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3644 18661-4:2015, is supported to enable declarations of functions and macros
3645 from that TS. Note that most features from that TS are not supported by
3648 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3649 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3650 Since the GNU C Library defaults to a much newer revision of POSIX, this
3651 will only affect programs that specifically request an old conformance
3652 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3653 see a change in the visible declarations, but a program compiled with
3654 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3657 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3658 defined by all multithreaded code, but glibc has not required this for
3661 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3662 means that in a future release, the macros “major”, “minor”, and “makedev”
3663 will only be available from <sys/sysmacros.h>.
3665 These macros are not part of POSIX nor XSI, and their names frequently
3666 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3667 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3668 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3671 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3672 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3673 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3675 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3676 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3677 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3678 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3679 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3680 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3681 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3682 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3683 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3684 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3685 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3688 * New <math.h> features are added from TS 18661-1:2014:
3690 - Signaling NaN macros: SNANF, SNAN, SNANL.
3692 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3693 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3694 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3696 - llogb functions: the llogb, llogbf and llogbl functions, and the
3697 FP_LLOGB0 and FP_LLOGBNAN macros.
3699 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3702 - Comparison macros: iseqsig.
3704 - Classification macros: iscanonical, issubnormal, iszero.
3706 - Total order functions: totalorder, totalorderf, totalorderl,
3707 totalordermag, totalordermagf, totalordermagl.
3709 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3711 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3712 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3714 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3715 are added to libc. They convert a floating-point number into string.
3717 * Most of glibc can now be built with the stack smashing protector enabled.
3718 It is recommended to build glibc with --enable-stack-protector=strong.
3719 Implemented by Nick Alcock (Oracle).
3721 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3722 intended to be used instead of memset() to erase sensitive data after use;
3723 the compiler will not optimize out calls to explicit_bzero even if they
3724 are "unnecessary" (in the sense that no _correct_ program can observe the
3725 effects of the memory clear).
3727 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3728 to float instead of double. This does not affect the ABI of any libraries
3729 that are part of the GNU C Library, but may affect the ABI of other
3730 libraries that use this type in their interfaces.
3732 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3733 float_t and double_t types are now defined to long double instead of float
3734 and double. These options are not the default, and this does not affect
3735 the ABI of any libraries that are part of the GNU C Library, but it may
3736 affect the ABI of other libraries that use this type in their interfaces,
3737 if they are compiled or used with those options.
3739 * The getentropy and getrandom functions, and the <sys/random.h> header file
3742 * The buffer size for byte-oriented stdio streams is now limited to 8192
3743 bytes by default. Previously, on Linux, the default buffer size on most
3744 file systems was 4096 bytes (and thus remains unchanged), except on
3745 network file systems, where the buffer size was unpredictable and could be
3746 as large as several megabytes.
3748 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3749 for the Linux quota interface which predates kernel version 2.4.22 has
3752 * The malloc_get_state and malloc_set_state functions have been removed.
3753 Already-existing binaries that dynamically link to these functions will
3754 get a hidden implementation in which malloc_get_state is a stub. As far
3755 as we know, these functions are used only by GNU Emacs and this change
3756 will not adversely affect already-built Emacs executables. Any undumped
3757 Emacs executables, which normally exist only during an Emacs build, should
3758 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3760 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3761 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3762 “no-ip6-dotint” had already been the default, and support for the
3763 “ip6-dotint” option was removed from the Internet in 2006.
3765 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3766 flag from <resolv.h> have been removed. The option relied on a
3767 backwards-incompatible DNS extension which was never deployed on the
3770 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3771 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3772 They were already unimplemented.
3774 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3775 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3776 removed again from the IETF name lookup interface specification in RFC
3777 2553. Applications should use getaddrinfo instead.
3779 * DNSSEC-related declarations and definitions have been removed from the
3780 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3781 decode the data part of DNSSEC record types. Previous versions of glibc
3782 only implemented minimal support for the previous version of DNSSEC, which
3783 is incompatible with the currently deployed version.
3785 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3786 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3787 <arpa/nameser.h> header file because the distinction between RR types and
3788 meta-RR types is not officially standardized, subject to revision, and
3789 thus not suitable for encoding in a macro.
3791 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3792 and rhook members of the res_state type in <resolv.h> have been removed.
3793 The glibc stub resolver did not support these hooks, but the header file
3794 did not reflect that.
3796 * For multi-arch support it is recommended to use a GCC which has
3797 been built with support for GNU indirect functions. This ensures
3798 that correct debugging information is generated for functions
3799 selected by IFUNC resolvers. This support can either be enabled by
3800 configuring GCC with '--enable-gnu-indirect-function', or by
3801 enabling it by default by setting 'default_gnu_indirect_function'
3802 variable for a particular architecture in the GCC source file
3805 * GDB pretty printers have been added for mutex and condition variable
3806 structures in POSIX Threads. When installed and loaded in gdb these pretty
3807 printers show various pthread variables in human-readable form when read
3808 using the 'print' or 'display' commands in gdb.
3810 * Tunables feature added to allow tweaking of the runtime for an application
3811 program. This feature can be enabled with the '--enable-tunables' configure
3812 flag. The GNU C Library manual has details on usage and README.tunables has
3813 instructions on adding new tunables to the library.
3815 * A new version of condition variables functions have been implemented in
3816 the NPTL implementation of POSIX Threads to provide stronger ordering
3819 * A new version of pthread_rwlock functions have been implemented to use a more
3820 scalable algorithm primarily through not using a critical section anymore to
3823 Security related changes:
3825 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3826 have been created with makecontext could fail to terminate due to a
3827 missing .cantunwind annotation. This has been observed to lead to a hang
3828 (denial of service) in some Go applications compiled with gccgo. Reported
3829 by Andreas Schwab. (CVE-2016-6323)
3831 * The DNS stub resolver functions would crash due to a NULL pointer
3832 dereference when processing a query with a valid DNS question type which
3833 was used internally in the implementation. The stub resolver now uses a
3834 question type which is outside the range of valid question type values.
3837 The following bugs are resolved with this release:
3839 [4099] stdio: Overly aggressive caching by stream i/o functions.
3840 [7065] build: Support building glibc with -fstack-protector or -fstack-
3842 [9842] localedata: en_CA: incorrect date format
3843 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3844 before it started waiting
3845 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3846 [15765] nptl: sem_open is wrongly a cancellation point
3847 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3848 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3850 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3851 library linked with pthread
3852 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3853 "FIXME: Ingo" issue)
3854 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3855 [17252] libc: getrandom and getentropy syscall
3856 [17730] malloc: thread-local storage is sometimes improperly free()'d
3857 after being __libc_memalign()'d
3858 [18241] stdio: failed fseek on memstream does not set errno and can fail
3860 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3862 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3863 PTHREAD_PRIO_INHERIT mutex on ARM
3864 [18784] network: res_query and related function crash for special record
3865 type queries (CVE-2015-5180)
3866 [19380] math: strtod does not raise "inexact"
3867 [19387] string: Integer overflow in memchr
3868 [19390] string: Integer overflow in strncat
3869 [19398] build: linknamespace tests fail with massively parallel build
3870 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3872 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3873 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3874 [19514] libc: [PATCH] Fix spelling errors in spelling
3875 "implement"/"implementation" in several places
3876 [19582] network: Deprecate RES_USE_INET6
3877 [19673] manual: clog10 docs appear to be erroneous
3878 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3879 causes a segmentation fault
3880 [19826] libc: invalid pointer returned from __tls_get_addr with static
3882 [20016] network: resolv: Remove hooks support from the API
3883 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3885 [20033] math: [x86_64] vectorized math function don't call the __finite
3887 [20116] nptl: use after free in pthread_create
3888 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3889 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3891 [20311] nptl: please install proc_service.h
3892 [20366] libc: Compilation errors in installed headers in strict-compliance
3894 [20370] malloc: malloc: Arena free list management is still racy
3895 (incorrect fix in bug 19243)
3896 [20386] libc: assert (X = 0) does not result in GCC warning
3897 [20432] malloc: malloc: Minimize interface required for interposition
3898 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3899 in _Unwind_Backtrace (CVE-2016-6323)
3900 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3901 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3903 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3904 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3905 [20477] network: resolv: incorrect double-checked locking related to
3907 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3909 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3911 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3912 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3913 cause transition penalty
3914 [20517] math: sparcv9 missing fdiml compat symbol
3915 [20524] manual: strverscmp is inconsistent
3916 [20525] libc: <sys/quota.h> should be based on kernel headers
3917 [20539] math: GCC 7 -static -lm fails to link at -O3
3918 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3920 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3922 [20591] network: Remove obsolete DNSSEC support
3923 [20592] network: DNS resource record type classification macros in
3924 <arpa/nameser.h> are incorrect
3925 [20593] network: Update DNS RR type definitions
3926 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3927 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3929 [20629] network: libresolv: Remove support for bitstring labels
3931 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3932 assertion: "maxidx >= 2"
3933 [20660] math: [arm] Use VSQRT
3934 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3935 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3936 [20689] libc: Test for FMA should also check for AVX.
3937 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3938 [20715] math: iszero macro breaks existing code
3939 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3940 [20728] libc: powerpc: Missing TOC stub in clone
3941 [20729] build: glibc-2.24 fails to build for i486 with -Os
3942 [20750] build: Build fails with default PIE enabled gcc-6.x
3943 [20768] math: [alpha] sqrt fegetenv namespace
3944 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3946 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3947 __FLT_EVAL_METHOD__ is 2
3948 [20790] network: rpcgen buffer overrun in get_prog_declaration
3949 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3950 [20829] libc: crypt snprintf namespace
3951 [20847] libc: tst-vfork3 failure
3952 [20855] math: Default bits/mathdef.h has inappropriate float_t
3953 [20859] math: [sh4] FP_ILOGB0 invalid
3954 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3955 U+20AC), not same as GBK
3956 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3957 [20916] math: pow handling of sNaN arguments
3958 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3959 [20919] math: Bad pow (qNaN, 0) result with -lieee
3960 [20940] math: hypot sNaN handling
3961 [20947] math: fmax, fmin sNaN handling
3962 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3963 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3965 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3966 [20973] nptl: robust mutexes: Lost wake-ups
3967 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3968 [20978] nis: strlen on null pointer in nss_nisplus
3969 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3971 [21014] string: i686 memchr overflows internal pointer check
3972 [21019] libc: [mips] n32 lseek incorrect on overflow
3973 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3974 [21026] libc: [MIPS] readahead syscall is broken on n64
3975 [21028] math: Fallback fesetexceptflag should always succeed
3976 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3977 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3979 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3980 [21061] librt: [microblaze] librt lost clock_* exports
3981 [21073] libc: tunables: insecure environment variables passed to
3982 subprocesses with AT_SECURE
3983 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3987 * The minimum Linux kernel version that this version of the GNU C Library
3988 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3989 kernel version 2.6.32 or later suffices (on architectures that already
3990 required kernel versions more recent than 3.2, those requirements remain
3991 unchanged). Linux 3.2 or later kernel headers are required on all
3994 * The pap_AN locale has been deleted. This has been deprecated for a long
3995 time. It has been replaced by pap_AW & pap_CW, both of which have long
3996 been included in previous releases.
3998 * The readdir_r and readdir64_r functions have been deprecated. It is
3999 recommended to use readdir and readdir64 instead.
4001 * The type “union wait” has been removed. It was deprecated in the early
4002 1990s and never part of POSIX. Application code should use the int type
4003 instead of “union wait”.
4005 * A new NSS action is added to facilitate large distributed system
4006 administration. The action, MERGE, allows remote user stores like LDAP
4007 to be merged into local user stores like /etc/groups in order to provide
4008 easy to use, updated, and managed sets of merged credentials. The new
4009 action can be used by configuring it in /etc/nsswitch.conf:
4010 group: files [SUCCESS=merge] nis
4011 Implemented by Stephen Gallagher (Red Hat).
4013 * The deprecated __malloc_initialize_hook variable has been removed from the
4016 * The long unused localedef --old-style option has been removed. It hasn't
4017 done anything in over 16 years. Scripts using this option can safely
4020 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4021 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4022 return the next representable value in the direction of positive infinity
4023 and the nextdown functions return the next representable value in the
4024 direction of negative infinity. These are currently enabled as GNU
4027 Security related changes:
4029 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4030 could result in a stack overflow when getnetbyname was called with an
4031 overly long name. (CVE-2016-3075)
4033 * Previously, getaddrinfo copied large amounts of address data to the stack,
4034 even after the fix for CVE-2013-4458 has been applied, potentially
4035 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4036 instead. Reported by Michael Petlan. (CVE-2016-3706)
4038 * The glob function suffered from a stack-based buffer overflow when it was
4039 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4040 Reported by Alexander Cherepanov. (CVE-2016-1234)
4042 * The Sun RPC UDP client could exhaust all available stack space when
4043 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4044 alloca plugin for GCC. (CVE-2016-4429)
4046 * The IPv6 name server management code in libresolv could result in a memory
4047 leak for each thread which is created, performs a failing naming lookup,
4048 and exits. Over time, this could result in a denial of service due to
4049 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4051 The following bugs are resolved with this release:
4053 [1170] localedata: ne_NP: update Nepali locale definition file
4054 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4056 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4057 [6796] math: fdim() does not set errno on overflow
4058 [10354] libc: posix_spawn should use vfork() in more cases than presently
4059 [11213] localedata: localedata: add copyright disclaimer to locale files
4060 [12143] localedata: chr_US: new Cherokee locale
4061 [12450] localedata: sgs_LT: new locale
4062 [12676] localedata: ln_CD: new locale
4063 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4065 [13304] math: fma, fmaf, fmal produce wrong results
4066 [14259] build: --localedir arg to configure is ignored
4067 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4068 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4069 [14934] localedata: es_CL: wrong first weekday chilean locale
4070 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4072 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4074 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4075 [15368] nptl: raise() is not async-signal-safe
4076 [15479] math: ceil, floor, round and trunc raise inexact exception
4077 [15578] localedata: kk_KZ: various updates
4078 [16003] localedata: pap_AN: punt old locale
4079 [16137] localedata: iw_IL: punt old locale
4080 [16190] localedata: eo: new esperanto locale
4081 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4082 [16742] malloc: race condition: pthread_atfork() called before first
4083 malloc() results in unexpected locking behaviour/deadlocks
4084 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4086 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4087 [17565] localedata: pt_PT: wrong (work-)week start
4088 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4089 [17950] build: Build fails with -msse
4090 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4091 [18433] libc: posix_spawn does not return correctly upon failure to
4093 [18453] localedata: charmaps/IBM875: incorrect codes
4094 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4096 [18896] localedata: he_IL: improvements for currency
4097 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4098 Romanian locale data
4099 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4101 [19056] libc: Deprecate readdir_r
4102 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4104 [19198] localedata: nl_NL: small improvements for Dutch locales
4105 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4106 nameservers (CVE-2016-5417)
4107 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4109 [19400] locale: Language missing in "iso-639.def", trivial fix in
4111 [19431] malloc: Deadlock between fflush, getdelim, and fork
4112 [19505] libc: Incorrect file descriptor validity checks in
4113 posix_spawn_file_actions_add{open,close,dup2}
4114 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4115 when using RTLD_NEXT
4116 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4117 `intl/{gettextP,loadinfo}.h'
4118 [19534] libc: execle, execlp may use malloc
4119 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4120 [19573] network: res_nclose and __res_maybe_init disagree about name
4121 server initialization, breaking Hesiod
4122 [19575] localedata: Status of GB18030 tables
4123 [19581] localedata: sr_* date_fmt string contains additional newline
4124 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4126 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4127 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4128 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4129 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4131 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4133 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4135 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4136 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4137 [19633] locale: strfmon_l applies global locale to number formatting
4138 [19642] network: Memory leak in getnameinfo
4139 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4140 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4142 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4143 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4145 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4146 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4148 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4150 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4152 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4153 pointers and lengths in error-case.
4154 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4155 report errors on UTF-16 surrogates values.
4156 [19755] nscd: nscd assertion failure in gc
4157 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4158 [19759] libc: mempcpy shouldn't be inlined
4159 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4160 [19765] libc: s390 needs an optimized mempcpy
4161 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4162 NAME_MAX limit assumption (CVE-2016-1234)
4163 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4164 [19787] network: Missing and incorrect truncation checks in getnameinfo
4165 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4167 [19791] network: Assertion failure in res_query.c with un-connectable name
4169 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4170 [19822] math: libm.so install clobbers old version
4171 [19825] network: resolv: send_vc can return uninitialized data in second
4172 response to getaddrinfo
4173 [19830] network: nss_dns: should check RDATA length against buffer length
4174 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4175 confronted with A/AAAA records of invalid size
4176 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4177 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4178 [19853] stdio: Printing IBM long double in decimal with high precision is
4180 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4181 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4182 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4184 [19865] network: Assertion failure or memory leak in
4185 _nss_dns_getcanonname_r
4186 [19868] network: nss_dns: netent code does not skip over non-PTR records
4187 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4189 [19881] string: Improve x86-64 memset
4190 [19907] string: Incorrect memcpy tests
4191 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4193 [19925] libc: termios.h XCASE namespace
4194 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4195 [19929] libc: limits.h NL_NMAX namespace
4196 [19931] stdio: Memory leak in vfprintf
4197 [19957] libc: clone(CLONE_VM) access invalid parent memory
4198 [19963] localedata: en_IL: New locale
4199 [19989] stdio: stdio.h cuserid namespace
4200 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4202 [19996] locale: langinfo.h nl_langinfo_l namespace
4203 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4204 [20010] network: getaddrinfo: Stack overflow in hostent translation
4206 [20012] stdio: libio: fmemopen append mode failure
4207 [20014] stdio: stdio.h namespace for pre-threads POSIX
4208 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4209 [20023] libc: fcntl.h timespec namespace
4210 [20024] math: [x86_64] vectorized sincos trashes the stack
4211 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4212 [20041] time: sys/time.h timespec namespace
4213 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4214 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4215 [20051] libc: ttyslot in wrong header under wrong conditions
4216 [20054] libc: gethostname not declared for XPG4
4217 [20055] libc: termios.h missing tcgetsid for XPG4
4218 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4220 [20073] libc: sys/stat.h fchmod namespace
4221 [20074] libc: stdlib.h rand_r namespace
4222 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4223 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4225 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4226 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4228 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4229 [20119] libc: Wrong mask for processors level type from CPUID
4230 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4231 AS not supporting AVX512
4232 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4234 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4235 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4237 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4238 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4239 [20178] libc: posix_spawn{p} should not call exit
4240 [20191] stdio: libio: vtables hardening
4241 [20195] string: FMA4 detection requires CPUID execution with register
4243 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4244 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4246 [20212] math: acos (sNaN) returns sNaN
4247 [20213] math: asin (sNaN) returns sNaN
4248 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4249 [20218] math: [i386] asinhl (sNaN) returns sNaN
4250 [20219] math: [i386] atanhl (sNaN) returns sNaN
4251 [20222] stdio: fopencookie: Mangle function pointers
4252 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4253 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4254 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4256 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4257 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4258 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4259 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4260 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4261 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4262 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4263 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4264 [20240] math: modf (sNaN) returns sNaN
4265 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4266 [20250] math: frexp (sNaN) returns sNaN
4267 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4268 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4270 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4271 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4272 subscript is below array bounds [-Werror=array-bounds]
4273 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4274 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4276 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4277 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4279 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4280 "invalid" exceptions
4281 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4282 [20316] localedata: id_ID: Februari instead of Pebruari
4283 [20327] string: POWER8 strcasecmp returns incorrect result
4284 [20347] math: Failure: Test: j0_downward (0xap+0)
4285 [20348] libc: FAIL: misc/tst-preadvwritev64
4286 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4287 [20350] libc: There is no test for p{read,write}64
4288 [20357] math: Incorrect cos result for 1.5174239687223976
4289 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4293 * Unicode 8.0.0 Support: Character encoding, character type info, and
4294 transliteration tables are all updated to Unicode 8.0.0, using new
4295 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4296 These updates cause user visible changes, such as the fixes for bugs
4297 89, 16061, and 18568.
4299 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4300 kernel-internal CPU set size. This means that requests that change the
4301 CPU affinity which failed before (for example, an all-ones CPU mask) will
4302 now succeed. Applications that need to determine the effective CPU
4303 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4304 setting it because the kernel can adjust it (and the previous size check
4305 would not detect this in the majority of cases).
4307 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4308 the following new symbols are used: fts64_children, fts64_close,
4309 fts64_open, fts64_read and fts64_set.
4311 * getaddrinfo now detects certain invalid responses on an internal netlink
4312 socket. If such responses are received, an affected process will
4313 terminate with an error message of "Unexpected error <number> on netlink
4314 descriptor <number>" or "Unexpected netlink response of size <number> on
4315 descriptor <number>". The most likely cause for these errors is a
4316 multi-threaded application which erroneously closes and reuses the netlink
4317 file descriptor while it is used by getaddrinfo.
4319 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4320 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4321 unnecessary serialization of memory allocation requests across threads.
4322 The defect is now corrected. Users should see a substantial increase in
4323 the concurent throughput of allocation requests for applications which
4324 trigger this bug. Affected applications typically create and
4325 destroy threads frequently. (Bug 19048 was reported and analyzed by
4328 * There is now a --disable-timezone-tools configure option for disabling the
4329 building and installing of the timezone related utilities (zic, zdump, and
4330 tzselect). This is useful for people who build the timezone data and code
4331 independent of the GNU C Library.
4333 * The obsolete header <regexp.h> has been removed. Programs that require
4334 this header must be updated to use <regex.h> instead.
4336 * The obsolete functions bdflush, create_module, get_kernel_syms,
4337 query_module and uselib are no longer available to newly linked binaries;
4338 the header <sys/kdaemon.h> has been removed. These functions and header
4339 were specific to systems using the Linux kernel and could not usefully be
4340 used with the GNU C Library on systems with version 2.6 or later of the
4343 * Optimized string, wcsmbs and memory functions for IBM z13.
4344 Implemented by Stefan Liebler.
4346 * Newly linked programs that define a variable called signgam will no longer
4347 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4348 require signgam to be set by those functions must ensure that they use the
4349 variable provided by the GNU C Library and declared in <math.h>, without
4350 defining their own copy.
4352 * The minimum GCC version that can be used to build this version of the GNU
4353 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4354 still be used to compile programs using the GNU C Library.
4356 Security related changes:
4358 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4359 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4361 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4362 the pointer guard feature. It is always enabled. Previously,
4363 LD_POINTER_GUARD could be used to disable security hardening in binaries
4364 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4367 * An integer overflow in hcreate and hcreate_r could lead to an
4368 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4370 * The catopen function no longer has unbounded stack usage. Reported by
4371 Max. (CVE-2015-8779)
4373 * The nan, nanf and nanl functions no longer have unbounded stack usage
4374 depending on the length of the string passed as an argument to the
4375 functions. Reported by Joseph Myers. (CVE-2014-9761)
4377 * A stack-based buffer overflow was found in libresolv when invoked from
4378 libnss_dns, allowing specially crafted DNS responses to seize control
4379 of execution flow in the DNS client. The buffer overflow occurs in
4380 the functions send_dg (send datagram) and send_vc (send TCP) for the
4381 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4382 family. The use of AF_UNSPEC triggers the low-level resolver code to
4383 send out two parallel queries for A and AAAA. A mismanagement of the
4384 buffers used for those queries could result in the response of a query
4385 writing beyond the alloca allocated buffer created by
4386 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4387 the overflow. Thanks to the Google Security Team and Red Hat for
4388 reporting the security impact of this issue, and Robert Holiday of
4389 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4391 The following bugs are resolved with this release:
4393 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4394 [887] math: Math library function "logb" and "nextafter" inconsistent
4395 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4396 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4397 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4398 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4400 [4404] localedata: German translation of "Alarm clock" is misleading
4401 [6799] math: nextafter() and nexttoward() doen't set errno on
4402 overflow/underflow errors
4403 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4405 [10432] nis: _nss_nis_setnetgrent assertion failure
4406 [11460] libc: fts has no LFS support
4407 [12926] network: getaddrinfo()/make_request() may spin forever
4408 [13065] nptl: Race condition in pthread barriers
4409 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4410 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4412 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4413 [14912] libc: Rename non-installed bits/*.h headers
4414 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4415 [15367] math: Let gcc use __builtin_isinf
4416 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4417 [15421] math: lgamma wrongly sets signgam for ISO C
4418 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4419 FE_INVALID with argument out of range
4420 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4422 [15786] dynamic-link: ifunc resolver functions can smash function
4424 [15918] math: Unnecessary check for equality in hypotf()
4425 [16061] localedata: Review / update transliteration data
4426 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4428 [16141] time: strptime %z offset restriction
4429 [16171] math: drem should be alias of remainder
4430 [16296] math: fegetround is pure?
4431 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4432 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4434 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4435 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4437 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4438 "Exception "Inexact" set" on ppc32
4439 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4440 [16517] math: Missing underflow exception from tanf/tan/tanl
4441 [16519] math: Missing underflow exception from sinhf
4442 [16520] math: Missing underflow exception from tanhf
4443 [16521] math: Missing underflow exception from exp2
4444 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4446 [16734] stdio: fopen calls mmap to allocate its buffer
4447 [16961] math: nan function incorrect handling of bad sequences
4448 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4449 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4450 [16985] locale: localedef: confusing error message when opening output
4452 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4453 [17197] locale: Redundant shift character in iconv conversion output at
4455 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4456 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4457 [17250] dynamic-link: static linking breaks nss loading
4458 (getaddrinfo/getpwnam/etc...)
4459 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4461 [17441] math: isnan() should use __builtin_isnan() in GCC
4462 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4463 (related to lock elision)
4464 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4465 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4466 [17887] time: strptime should be able to parse "+01:00" style timezones
4467 [17905] libc: catopen() Multiple unbounded stack allocations
4469 [18084] libc: backtrace (..., 0) dumps core on x86
4470 [18086] libc: nice() sets errno to 0 on success
4471 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4472 is too large (CVE-2015-8778)
4473 [18251] dynamic-link: SONAME missing when audit modules provides path
4474 [18265] libc: add attributes for wchar string and memory functions
4475 [18370] math: csqrt missing underflows
4476 [18421] libc: [hppa] read-only segment has dynamic relocations
4477 [18472] libc: Obsolete syscall wrappers should be compat symbols
4478 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4479 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4480 [18525] localedata: Remove locale timezone information
4481 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4482 [18568] localedata: Update locale data to Unicode 8.0
4483 [18589] locale: sort-test.sh fails at random
4484 [18595] math: ctan, ctanh missing underflows
4485 [18604] libc: assert macro-expands its argument
4486 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4487 contains a vector instruction exception.
4488 [18611] math: j1, jn missing errno setting on underflow
4489 [18618] localedata: sync Chechen locale definitions with other *_RU
4491 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4492 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4493 [18665] network: In send_dg, the recvfrom function is NOT always using the
4494 buffer size of a newly created buffer (CVE-2015-7547)
4495 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4497 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4499 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4500 [18699] math: tilegx cproj() for various complex infinities does not yield
4502 [18724] libc: Harden put*ent functions against data injection
4503 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4504 [18755] build: build errors with -DNDEBUG
4505 [18757] stdio: fmemopen fails to set errno on failure
4506 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4508 [18781] libc: openat64 lacks O_LARGEFILE
4509 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4510 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4511 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4512 [18790] math: [ldbl-128ibm] tanhl inaccurate
4513 [18795] libc: stpncpy fortification misses buffer lengths that are
4514 statically too large
4515 [18796] build: build fails for --disable-mathvec
4516 [18803] math: hypot missing underflows
4517 [18820] stdio: fmemopen may leak memory on failure
4518 [18823] math: csqrt spurious underflows
4519 [18824] math: fma spurious underflows
4520 [18825] math: pow missing underflows
4521 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4522 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4523 [18870] build: sem_open.c fails to compile with missing symbol
4525 [18872] stdio: Fix memory leak in printf_positional
4526 [18873] libc: posix_fallocate overflow check ineffective
4527 [18875] math: Excess precision leads incorrect libm
4528 [18877] libc: arm: mmap offset regression
4529 [18887] libc: memory corruption when using getmntent on blank lines
4530 [18918] localedata: hu_HU: change time to HH:MM:SS format
4531 [18921] libc: Regression: extraneous stat() and fstat() performed by
4533 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4534 binaries (CVE-2015-8777)
4535 [18951] math: tgamma missing underflows
4536 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4538 [18953] localedata: lt_LT: change currency symbol to the euro
4539 [18956] math: powf inaccuracy
4540 [18961] math: [i386] exp missing underflows
4541 [18966] math: [i386] exp10 missing underflows
4542 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4543 [18969] build: multiple string test failures due to missing locale
4545 [18970] libc: Reference of pthread_setcancelstate in libc.a
4546 [18977] math: float / long double Bessel functions not in XSI POSIX
4547 [18980] math: i386 libm functions return with excess range and precision
4548 [18981] math: i386 scalb*, ldexp return with excess range and precision
4549 [18982] stdio: va_list and vprintf
4550 [18985] time: Passing out of range data to strftime() causes a segfault
4552 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4553 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4554 [19012] locale: iconv_open leaks memory on error path
4555 [19016] math: clog, clog10 inaccuracy
4556 [19018] nptl: Mangle function pointers in tls_dtor_list
4557 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4558 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4559 [19048] malloc: malloc: arena free list can become cyclic, increasing
4561 [19049] math: [powerpc] erfc incorrect zero sign
4562 [19050] math: [powerpc] log* incorrect zero sign
4563 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4564 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4565 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4566 [19074] network: Data race in _res_hconf_reorder_addrs
4567 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4568 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4569 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4571 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4573 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4574 [19086] manual: posix_fallocate64 documented argument order is wrong.
4575 [19088] math: lround, llround missing exceptions close to overflow
4577 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4578 [19095] math: dbl-64 lrint incorrect for 64-bit long
4579 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4580 [19124] dynamic-link: ld.so failed to build with older assmebler
4581 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4582 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4583 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4584 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4585 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4586 pthread_setaffinity_np
4587 [19156] math: [ldbl-128] j0l spurious underflows
4588 [19164] nptl: tst-getcpu fails with many possible CPUs
4589 [19168] math: math/test-ildoubl and math/test-ldouble failure
4590 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4591 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4593 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4594 (FE_NOMASK_ENV) do not clear SSE exceptions
4595 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4596 _int_new_arena/reused_arena
4597 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4598 [19201] math: dbl-64 remainder incorrect sign of zero result
4599 [19205] math: bits/math-finite.h conditions do not match math.h and
4601 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4602 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4603 for C99-based standards
4604 [19212] libc: features.h not -Wundef clean
4605 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4607 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4608 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4609 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4611 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4612 "inexact" exceptions
4613 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4615 [19242] libc: strtol incorrect in Turkish locales
4616 [19243] malloc: reused_arena can pick an arena on the free list, leading
4617 to an assertion failure and reference count corruption
4618 [19253] time: tzset() ineffective when temporary TZ did not include DST
4620 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4621 [19270] math: [hppa] Shared libm missing __isnanl
4622 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4623 MAP_HUGETLB and MAP_STACK defines
4624 [19313] nptl: Wrong __cpu_mask for x32
4625 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4626 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4627 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4628 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4629 [19363] time: x32: times() return value wrongly truncates/sign extends
4631 [19367] dynamic-link: Improve branch prediction on Silvermont
4632 [19369] network: Default domain name not reset by res_ninit when "search"
4633 / "domain" entry is removed from resolv.conf
4634 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4636 [19385] localedata: bg_BG: time separator should be colon, not comma
4637 [19408] libc: linux personality syscall wrapper may erroneously return an
4638 error on 32-bit architectures
4639 [19415] libc: dladdr returns wrong names on hppa
4640 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4641 IBM905, IBM907, and IBM909
4642 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4643 [19443] build: build failures with -DDEBUG
4644 [19451] build: Make check fails on test-double-vlen2
4645 [19462] libc: Glibc failed to build with -Os
4646 [19465] math: Wrong code with -Os
4647 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4649 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4651 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4652 [19486] math: S390: Math tests fail with "Exception Inexact set".
4653 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4654 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4656 [19590] math: Fail to build shared objects that use libmvec.so functions.
4660 * The following bugs are resolved with this release:
4662 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4663 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4664 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4665 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4666 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4667 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4668 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4669 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4670 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4671 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4672 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4673 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4674 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4675 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4676 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4677 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4678 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4679 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4680 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4681 18657, 18676, 18694, 18696, 18887.
4683 * Cache information can be queried via sysconf() function on s390 e.g. with
4684 _SC_LEVEL1_ICACHE_SIZE as argument.
4686 * A buffer overflow in gethostbyname_r and related functions performing DNS
4687 requests has been fixed. If the NSS functions were called with a
4688 misaligned buffer, the buffer length change due to pointer alignment was
4689 not taken into account. This could result in application crashes or,
4690 potentially arbitrary code execution, using crafted, but syntactically
4691 valid DNS responses. (CVE-2015-1781)
4693 * The time zone file parser has been made more robust against crafted time
4694 zone files, avoiding heap buffer overflows related to the processing of
4695 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4696 large time zone data files. Overly long time zone specifiers in the TZ
4697 variable no longer result in stack overflows and crashes.
4699 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4700 for LD and GD on x86 and x86-64, has been implemented. You will need
4701 binutils-2.24 or later to enable this optimization.
4703 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4704 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4705 Hat). These updates cause user visible changes, such as the fix for bug
4708 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4709 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4710 condition in some applications.
4712 * Added vector math library named libmvec with the following vectorized x86_64
4713 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4715 The library can be disabled with --disable-mathvec. Use of the functions is
4716 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4717 Shared library libmvec.so is linked in as needed when using -lm (no need to
4718 specify -lmvec explicitly for not static builds).
4719 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4721 * A new fmemopen implementation has been added with the goal of POSIX
4722 compliance. The new implementation fixes the following long-standing
4723 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4724 old implementation is still present for use be by existing binaries.
4726 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4727 releases. It has been fixed to match 2.19 and older, but binaries built
4728 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4730 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4731 Contributed by Roland McGrath (Google).
4733 * The header <regexp.h> is deprecated, and will be removed in a future
4734 release. Use of this header will trigger a deprecation warning.
4735 Application developers should update their code to use <regex.h> instead.
4737 This header was formerly part of SUS, but was deprecated in 1994 and
4738 removed from the standard in 2001. Also, the glibc implementation
4739 leaks memory. See BZ#18681 for more details.
4743 * The following bugs are resolved with this release:
4745 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4746 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4747 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4748 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4749 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4750 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4751 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4752 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4753 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4754 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4757 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4758 too little memory for the to-be-scanned arguments and overflow the
4759 allocated buffer. The implementation now correctly computes the required
4760 buffer size when using malloc, and switches to malloc from alloca as
4763 * A new semaphore algorithm has been implemented in generic C code for all
4764 machines. Previous custom assembly implementations of semaphore were
4765 difficult to reason about or ensure that they were safe. The new version
4766 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4767 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4768 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4770 * Port to Altera Nios II has been contributed by Mentor Graphics.
4772 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4773 implementations for powerpc64/powerpc64le.
4774 Implemented by Adhemerval Zanella (IBM).
4776 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4777 and powerpc64le. This may improve lock scaling of existing programs on
4778 HTM capable systems. The lock elision code is only enabled with
4779 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4780 powerpc will issue a transaction abort on every syscall to avoid side
4781 effects being visible outside transactions.
4783 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4784 AArch64. Contributed by ARM Ltd.
4786 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4788 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4789 under certain input conditions resulting in the execution of a shell for
4790 command substitution when the application did not request it. The
4791 implementation now checks WRDE_NOCMD immediately before executing the
4792 shell and returns the error WRDE_CMDSUB as expected.
4794 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4795 processing format strings with a large number of format specifiers.
4797 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4798 infinite loop if the DNS response contained a PTR record of an unexpected
4801 * The minimum GCC version that can be used to build this version of the GNU
4802 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4803 still be used to compile programs using the GNU C Library.
4805 * The GNU C Library is now built with -Werror by default. This can be
4806 disabled by configuring with --disable-werror.
4808 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4810 * The obsolete sigvec function has been removed. This was the original
4811 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4812 programs have been using instead for about 25 years. Of course, ABI
4813 compatibility for old binaries using sigvec remains intact.
4815 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4816 with newer versions of bison.
4818 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4819 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4820 registers overlay two consecutive single-precision registers. MIPS32R2
4821 introduced a new FPU mode (FR=1) where double-precision registers extend the
4822 corresponding single-precision registers which is incompatible with the
4823 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4824 require the use of FR=1 making a transition necessary. New o32 ABI
4825 extensions enable users to migrate over time from the original o32 ABI
4826 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4827 tracks the ABI of any loaded object and verifies that new objects are
4828 compatible. Mode transitions will also be requested as required and
4829 unsupportable objects will be rejected. The ABI checks include both soft and
4830 hard float ABIs for o32, n32 and n64.
4832 GCC 5 with GNU binutils 2.25 onwards:
4833 It is strongly recommended that all o32 system libraries are built using the
4834 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4835 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4836 compiler using --with-fp-32=xx to set this by default.
4840 * The following bugs are resolved with this release:
4842 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4843 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4844 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4845 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4846 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4847 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4848 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4849 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4850 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4851 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4852 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4853 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4854 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4855 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4856 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4858 * Reverted change of ABI data structures for s390 and s390x:
4859 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4860 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4861 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4862 are preserved pointing straight to the same implementation as the old ones.
4863 Given that, new callers will simply provide a too-big buffer to these
4864 functions. Any applications/libraries out there that embed jmp_buf or
4865 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4866 against 2.19 headers will have to rebuilt again. This is necessary in any
4867 case to revert the breakage in their ABI caused by the glibc change.
4869 * Support for file description locks is added to systems running the
4870 Linux kernel. The standard file locking interfaces are extended to
4871 operate on file descriptions, not file descriptors, via the use of
4872 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4873 are associated with an open file instead of a process.
4875 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4877 * The minimum Linux kernel version that this version of the GNU C Library
4878 can be used with is 2.6.32.
4880 * Running the testsuite no longer terminates as soon as a test fails.
4881 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4882 with PASS or FAIL lines for individual tests. A summary of the results is
4883 printed, including a list of failing lists, and "make check" exits with
4884 error status if there were any unexpected failures. "make check
4885 stop-on-test-failure=y" may be used to keep the old behavior.
4887 * The am33 port, which had not worked for several years, has been removed
4890 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4891 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4892 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4893 conflicted with POSIX (support for which was removed in 2.19), the
4894 interfaces those macros enabled remain available when compiling with
4895 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4896 test macros defined.
4898 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4900 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4901 This may improve lock scaling of existing programs on TX capable systems.
4902 The lock elision code is only built with --enable-lock-elision=yes and
4903 then requires a GCC version supporting the TX builtins. With lock elision
4904 default mutexes are elided via __builtin_tbegin, if the cpu supports
4905 transactions. By default lock elision is not enabled and the elision code
4908 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4909 copy the path argument. This allowed programs to cause posix_spawn to
4910 deference a dangling pointer, or use an unexpected pathname argument if
4911 the string was modified after the posix_spawn_file_actions_addopen
4914 * All supported architectures now use the main glibc sysdeps directory
4915 instead of some being in a separate "ports" directory (which was
4916 distributed separately before glibc 2.17).
4918 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4919 On configurations that support it (all Linux configurations), it's now
4920 used regardless of the --enable-add-ons switch to configure. It is no
4921 longer possible to build such configurations without pthreads support.
4923 * Locale names, including those obtained from environment variables (LANG
4924 and the LC_* variables), are more tightly checked for proper syntax.
4925 setlocale will now fail (with EINVAL) for locale names that are overly
4926 long, contain slashes without starting with a slash, or contain ".." path
4927 components. (CVE-2014-0475) Previously, some valid locale names were
4928 silently replaced with the "C" locale when running in AT_SECURE mode
4929 (e.g., in a SUID program). This is no longer necessary because of the
4932 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4933 with application code using Intel MPX instructions. (With all previous
4934 versions, the MPX register state could be clobbered when making calls
4935 into or out of a shared library.) Note that while the new dynamic
4936 linker is compatible with all known x86 hardware whether or not it
4937 supports Intel MPX, some x86 instruction-set emulators might fail to
4938 handle the new instruction encodings. This is known to affect Valgrind
4939 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4940 release), and might affect other tools that do instruction emulation.
4942 * Support for loadable gconv transliteration modules has been removed.
4943 The support for transliteration modules has been non-functional for
4944 over a decade, and the removal is prompted by security defects. The
4945 normal gconv conversion modules are still supported. Transliteration
4946 with //TRANSLIT is still possible, and the //IGNORE specifier
4947 continues to be supported. (CVE-2014-5119)
4949 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4950 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4951 resulting a denial-of-service security vulnerability in applications which
4952 use functions related to iconv. (CVE-2014-6040)
4956 * The following bugs are resolved with this release:
4958 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4959 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4960 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4961 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4962 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4963 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4964 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4965 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4966 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4967 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4968 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4969 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4970 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4971 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4972 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4973 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4974 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4975 16431, 16453, 16474, 16506, 16510, 16529
4977 * Slovenian translations for glibc messages have been contributed by the
4978 Translation Project's Slovenian team of translators.
4980 * The public headers no longer use __unused nor __block. This change is to
4981 support compiling programs that are derived from BSD sources and use
4982 __unused internally, and to support compiling with Clang's -fblock
4983 extension which uses __block.
4985 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4986 large collation sequences to optimize multiple passes. This cache
4987 computation may overflow for large collation sequences and may cause a
4988 stack or buffer overflow. This is now fixed to use a slower algorithm
4989 which does not use a cache if there is an integer overflow.
4991 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4992 rules for large collation sequences to optimize multiple passes and falls
4993 back to alloca if malloc fails, resulting in a possible stack overflow.
4994 The implementation now falls back to an uncached collation sequence lookup
4997 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4998 initialized for static applications resulting in the security feature
4999 being disabled. The pointer guard is now correctly initialized to a
5000 random value for static applications. Existing static applications need
5001 to be recompiled to take advantage of the fix (bug 15754).
5003 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5004 to the d_name member of struct dirent, or omit the terminating NUL
5005 character. (Bugzilla #14699).
5007 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5008 aligned_alloc functions could allocate too few bytes or corrupt the
5009 heap when passed very large allocation size values (Bugzilla #15855,
5012 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5013 for AF_INET6 has been fixed (Bugzilla #16072).
5015 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5016 pap_CW, quz_PE, the_NP.
5018 * Substantially revised locales: gd_GB, ht_HT
5020 * The LC_ADDRESS field was updated to support country_car for almost all
5023 * ISO 1427 definitions were updated.
5025 * ISO 3166 definitions were updated.
5027 * The localedef utility now supports --big-endian and --little-endian
5028 command-line options to generate locales for a different system from that
5029 for which the C library was built.
5031 * Binary locale files now only depend on the endianness of the system for
5032 which they are generated and not on other properties of that system. As a
5033 consequence, binary files generated with new localedef may be incompatible
5034 with old versions of the GNU C Library, and binary files generated with
5035 old localedef may be incompatible with this version of the GNU C Library,
5036 in the following circumstances:
5038 + Locale files may be incompatible on m68k systems.
5040 + Locale archive files (but not separate files for individual locales) may
5041 be incompatible on systems where plain "char" is signed.
5043 * The configure option --disable-versioning has been removed. Builds with
5044 --disable-versioning had not worked for several years.
5046 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5047 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5049 * SystemTap probes for malloc have been introduced.
5051 * SystemTap probes for slow multiple precision fallback paths of
5052 transcendental functions have been introduced.
5054 * Support for powerpc64le has been added.
5056 * The soft-float powerpc port now supports e500 processors.
5058 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5060 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5061 set of header declarations that are enabled by default, even when other
5062 feature test macros or compiler options such as -std=c99 would otherwise
5063 disable some of those declarations.
5065 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5066 conflict with POSIX. The libbsd-compat library (which was a dummy library
5067 that did nothing) has also been removed.
5069 * Preliminary documentation about Multi-Thread, Async-Signal and
5070 Async-Cancel Safety has been added.
5072 * Change of ABI data structures for s390 and s390x:
5073 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5074 allow for future hardware extensions. All library functions that accept or
5075 return these structures were versioned in order to provide backwards
5076 compatibility with existing code. However, not all cases can be handled
5077 with interface versioning. If an application embeds either structure into
5078 another structure and that structure is passed to another compilation unit
5079 which expects the newer larger-sized object then any access to the new
5080 fields will result in undefined behaviour. Similarly any access to fields
5081 that were moved by the enlarging of the structures will cause undefined
5082 behaviour. To fix the undefined behaviour all objects that are part of the
5083 final in-memory image must agree on the size of structures, and this may
5084 require recompilation.
5088 * The following bugs are resolved with this release:
5090 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5091 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5092 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5093 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5094 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5095 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5096 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5097 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5098 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5099 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5100 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5101 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5102 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5105 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5106 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5107 Distributions can re-enable building and using pt_chown via the new configure
5108 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5109 considerable security risks and should only be used if the distribution
5110 understands and accepts the risks.
5112 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5115 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5116 fixed (Bugzilla #15330).
5118 * Add support for calling C++11 thread_local object destructors on thread
5119 and program exit. This needs compiler support for offloading C++11
5120 destructor calls to glibc.
5122 * Improved worst case performance of libm functions with double inputs and
5125 * Support for priority inherited mutexes in pthread condition variables on
5126 non-x86 architectures.
5128 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5130 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5132 * Optimized string functions for ARM. Implemented by Will Newton and
5135 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5137 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5140 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5141 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5143 * Added a benchmark framework to track performance of functions in glibc.
5145 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5146 It is based on draft TS 18661 and currently enabled as a GNU extension.
5148 * On Linux, the clock function now uses the clock_gettime system call
5149 for improved precision, rather than old times system call.
5151 * Added support for version-3 tz format files. This is needed when using
5152 the tz database release 2013e or later, and affects a few unusual cases --
5153 currently only TZ='America/Godthab' for time stamps after 2037.
5155 * Added new API functions pthread_getattr_default_np and
5156 pthread_setattr_default_np to get and set the default pthread
5157 attributes of a process.
5159 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5160 This may improve lock scaling of existing programs on TSX capable systems.
5161 When the --enable-lock-elision=yes parameter is specified at configure
5162 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5165 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5166 availability). Implemented by Ryan S. Arnold.
5168 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5172 * The following bugs are resolved with this release:
5174 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5175 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5176 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5177 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5178 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5179 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5180 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5181 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5182 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5183 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5184 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5185 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5186 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5187 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5188 14879, 14889, 14893, 14898, 14914.
5190 * Optimization of memcpy for MIPS.
5192 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5193 EMFILE has been fixed (Bugzilla #14889).
5195 * The add-on ports collection is now distributed in the "ports" subdirectory
5196 of the main GNU C Library distribution, rather than separately.
5198 * Port to ARM AArch64 contributed by Linaro.
5200 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5201 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5203 Implemented by Andreas Krebbel.
5205 * The new function secure_getenv allows secure access to the environment,
5206 returning NULL if running in a SUID/SGID process. This function replaces
5207 the internal function __secure_getenv.
5209 * SystemTap static probes have been added into the dynamic linker.
5210 Implemented by Gary Benson.
5212 * Optimizations of string functions strstr, strcasestr and memmem.
5213 Implemented by Maxim Kuvyrkov.
5215 * The minimum Linux kernel version that this version of the GNU C Library
5216 can be used with is 2.6.16.
5218 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5219 powerpc POWER7. Implemented by Will Schmidt.
5221 * New configure option --disable-nscd builds the C library such that it
5222 never attempts to contact the Name Service Caching Daemon (nscd).
5223 New configure option --disable-build-nscd avoids building nscd itself;
5224 this is the default if --disable-nscd is used.
5226 * Improved support for cross-compilation, including cross-testing and
5227 bootstrap builds without a previously built glibc.
5229 * Several testsuite tests are now able to test multiple IFUNC variants of an
5230 interface, rather than just testing the one that would be chooen by
5233 * New configure options --with-bugurl and --with-pkgversion, for
5234 distributors to use to embed their bug-reporting and package version
5235 information in --help and --version output.
5237 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5238 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5239 allows creation of chroots without the procfs mounted on /proc.
5241 * The `crypt' function now fails if passed salt bytes that violate the
5242 specification for those values. On Linux, the `crypt' function will
5243 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5244 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5245 when the mode is enabled.
5247 * The `clock_*' suite of functions (declared in <time.h>) is now available
5248 directly in the main C library. Previously it was necessary to link with
5249 -lrt to use these functions. This change has the effect that a
5250 single-threaded program that uses a function such as `clock_gettime' (and
5251 is not linked with -lrt) will no longer implicitly load the pthreads
5252 library at runtime and so will not suffer the overheads associated with
5253 multi-thread support in other code such as the C++ runtime library.
5255 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5260 * The following bugs are resolved with this release:
5262 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5263 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5264 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5265 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5266 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5267 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5268 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5269 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5270 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5271 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5272 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5273 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5274 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5275 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5276 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5277 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5278 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5279 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5280 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5281 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5282 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5283 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5286 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5287 configuring glibc with:
5288 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5289 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5290 Implemented by H.J. Lu.
5294 + define static_assert
5296 + do not declare gets
5298 + declare at_quick_exit and quick_exit also for ISO C11
5300 + aligned_alloc. NB: The code is deliberately allows the size parameter
5301 to not be a multiple of the alignment. This is a moronic requirement
5302 in the standard but it is only a requirement on the caller, not the
5305 + timespec_get added
5307 + uchar.h support added
5309 + CMPLX, CMPLXF, CMPLXL added
5311 Implemented by Ulrich Drepper.
5313 * Support for the IA-64 has been moved to ports.
5315 * Remove support for anything but ELF binary format
5317 * Checking versions of poll, ppoll added.
5318 Implemented by Ulrich Drepper.
5320 * More generic and 64-bit performance optimizations to math functions.
5321 Implemented by Ulrich Drepper.
5323 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5324 headers and functions available at compile time as they were before
5325 version 2.14. This option will be removed at some time in the future
5326 after the TI-RPC library becomes fully sufficient for the needs of
5327 existing applications.
5329 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5330 Note that glibc is not expected to work with any Linux kernel version
5333 * New header <sys/auxv.h> and function getauxval allowing easy access to
5334 the AT_* key-value pairs passed from the Linux kernel. The header also
5335 defines the HWCAP_* bits associated with the AT_HWCAP key.
5337 * New locales: mag_IN
5339 * New configure option --enable-systemtap builds SystemTap static probes
5340 into libc for setjmp and longjmp and into libpthread for various operations.
5341 So far the setjmp/longjmp probes and some of the libpthread probes are
5342 provided only for i*86 and x86_64.
5343 Implemented by Roland McGrath and Rayson Ho.
5345 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5347 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5350 * More optimized functions for SPARC. Implemented by David S. Miller.
5352 * Improved support for cross-compilation, especially bootstrap builds
5353 without a previously built glibc.
5355 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5356 Chris Metcalf from Tilera.
5358 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5359 now supported for ARM processors.
5361 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5362 as the name of the dynamic linker, to distinguish it from the
5363 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5365 * Support for CRIS has been removed from ports.
5367 * A new class of installed header has been documented for low-level
5368 platform-specific functionality. PowerPC added the first instance with a
5369 function to provide time base register access. Contributed by Tulio
5370 Magno Quites Machado Filho.
5372 * ix86 configurations now install header files that are consistent with
5373 what x86-64 configurations install. These same header files can be used
5374 for -m32, -m64, or -mx32 builds.
5375 Contributed by H.J. Lu.
5377 * Math library bug fixes. A thorough audit of all open math library bugs was
5378 conducted by Joseph Myers. Significant progress was made on many math
5379 library bugs resulting in more accurate exceptions and function results.
5380 Many thanks to all those that contributed including Andreas Jaeger for his
5381 patch review and work on the x87 trigonometric instruction issues.
5383 * Timezone data is no longer installed. Timezone-related binaries and scripts
5384 will continue to be installed. Users should obtain their timezone data from
5385 their distribution provider or from the tzdata package at
5386 <ftp://munnari.oz.au/pub/>.
5390 * The following bugs are resolved with this release:
5392 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5393 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5394 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5395 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5396 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5397 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5398 13484, 13506, 13515, 13523, 13524, 13538, 13540
5400 * New program pldd to list loaded object of a process
5401 Implemented by Ulrich Drepper.
5403 * Add nss_db support back to glibc. No more dependency on Berkeley db
5404 and support for initgroups lookups.
5405 Implemented by Ulrich Drepper.
5407 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5408 Contributed by HJ Lu.
5410 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5411 Contributed by HJ Lu.
5413 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5414 on x86-32 and x86-64.
5415 Contributed by Liubov Dmitrieva.
5417 * Optimized strchr and strrchr for SSE on x86-32.
5418 Contributed by Liubov Dmitrieva.
5420 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5421 for x86-64 and x86-32.
5422 Contributed by Liubov Dmitrieva.
5424 * New interfaces: scandirat, scandirat64
5425 Implemented by Ulrich Drepper.
5427 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5428 Implemented by Ulrich Drepper.
5430 * nscd now also caches the netgroup database.
5431 Implemented by Ulrich Drepper.
5433 * Integrate libm with gcc's -ffinite-math-only option.
5434 Implemented by Ulrich Drepper.
5436 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5437 to math functions. Implemented by Ulrich Drepper.
5439 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5440 Implemented by Ulrich Drepper.
5442 * New Linux interfaces: process_vm_readv, process_vm_writev
5444 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5445 Implemented by Ulrich Drepper.
5447 * Optimized nearbyint and strcasecmp for PPC.
5448 Implemented by Adhemerval Zanella.
5450 * New locales: bho_IN, unm_US, es_CU, ta_LK
5454 * The following bugs are resolved with this release:
5456 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5457 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5458 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5459 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5460 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5461 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5462 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5463 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5464 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5465 12795, 12811, 12813, 12814, 12841
5467 * The RPC implementation in libc is obsoleted. Old programs keep working
5468 but new programs cannot be linked with the routines in libc anymore.
5469 Programs in need of RPC functionality must be linked against TI-RPC.
5470 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5472 Visible changes of this change include (obviously) the inability to link
5473 programs using RPC functions without referencing the TI-RPC library and the
5474 removal of the RPC headers from the glibc headers.
5475 Implemented by Ulrich Drepper.
5477 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5478 syncfs, setns, sendmmsg
5480 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5481 yue_HK, lij_IT, mhr_RU
5483 * New encodings: CP770, CP771, CP772, CP773, CP774
5485 * New program sotruss to trace calls through PLTs
5486 Implemented by Ulrich Drepper.
5488 * The malloc hook implementation is marked deprecated and will be removed
5489 from the default implementation in the next version. The design never
5490 worked ever since the introduction of threads. Even programs which do
5491 not create threads themselves can use multiple threads created internally.
5495 * The following bugs are resolved with this release:
5497 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5498 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5499 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5500 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5503 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5505 * POWER7 optimizations: memset, memcmp, strncmp
5507 * New optimized string functions for x86-64: strnlen (SSE2),
5508 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5509 Implemented by Ulrich Drepper.
5513 * The following bugs are resolved with this release:
5515 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5516 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5517 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5518 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5519 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5520 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5521 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5522 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5524 * New interfaces: pthread_getname_np, pthread_setname_np
5526 * New Linux interface: recvmmsg
5528 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5530 * The dynamic linker now recognizes supported ABI versions from the
5531 EI_ABIVERSION field in the ELF header.
5532 Implemented by Ulrich Drepper.
5534 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5535 will not be used to fill in password fields in the passwd.byname replies.
5536 Instead it is used to synthesize the shadow.byname table, should it be
5537 missing. This is a useful mode in some installations involving Solaris.
5538 Implemented by Ulrich Drepper.
5540 * New locales: kok_IN, sq_MK, cv_RU
5544 * The following bugs are resolved with this release:
5546 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5547 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5548 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5549 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5550 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5551 10789, 10817, 10823, 10840, 10847
5553 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5555 Implemented by Ulrich Drepper.
5557 * Checking version of longjmp added that fails if an uninitialized stack
5558 frame would be created. Implemented by Ulrich Drepper.
5560 * STT_GNU_IFUNC is now supported in static executables.
5561 Implemented by H.J. Lu.
5563 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5565 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5566 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5567 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5568 Contributed by H.J. Lu.
5570 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5571 Implemented by Ulrich Drepper.
5573 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5575 Contributed by H.J. Lu.
5577 * Support for fma instruction in AVX on x86-64.
5578 Implemented by H.J. Lu and Ulrich Drepper.
5580 * AVX support in x86-64 auditing support in ld.so.
5581 Implemented by H.J. Lu.
5583 * STB_GNU_UNIQUE support added.
5584 Implemented by Ulrich Drepper.
5586 * Implement second fallback mode for optimized DNS lookup for even more
5587 broken environments. If two requests from the same port are not
5588 handled correctly close the socket and open a new one before sending
5589 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5590 can be used to select this mode right away, instead of rediscovering the
5591 necessity is every process again.
5592 Implemented by Ulrich Drepper.
5594 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5595 Implemented by Adam Tkac.
5597 * Optimized iconv conversions for S390x.
5598 Implemented by Andreas Krebbel.
5600 * Using condvars with PI mutexes is now more efficient due to kernel
5601 support for requeueing to PI futexes. NPTL support added for x86-64.
5602 Implemented by Ulrich Drepper.
5604 * New locales: ps_AF, my_MM
5608 * The following bugs are resolved with this release:
5610 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5611 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5612 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5613 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5614 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5616 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5617 Implemented by Ulrich Drepper.
5619 * New Linux interfaces: accept4, fallocate, fallocate64.
5620 Implemented by Ulrich Drepper.
5622 * Correct declarations of string function when used in C++ code. This
5623 could lead to compile errors for invalid C++ code.
5625 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5628 * New POSIX 2008 interface: psiginfo
5629 Implemented by Ulrich Drepper.
5631 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5632 Implemented by Ulrich Drepper.
5634 * Support for selecting between multiple function definitions at runtime
5635 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5637 * The libcrypt library can now use the hash function implementations in
5638 NSS. Implemented by Ulrich Drepper.
5640 * The malloc implementation can be compiled to be less memory efficient
5641 but higher performing in multi-threaded programs.
5642 Implemented by Ulrich Drepper.
5644 * New locales: nan_TW@latin, ks_IN
5646 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5647 Implemented by Ulrich Drepper.
5649 * Extended printf hook support. It is possible to use user-defined types
5650 and extend existing format specifiers.
5651 Implemented by Ulrich Drepper.
5653 * Handling for group shadow files has been added.
5654 Implemented by Ulrich Drepper.
5656 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5657 servers (the case, e.g., for some people using the built-in DNS
5658 server in ADSL modems/routers). There is a once-per-process timeout
5659 in case of a broken server. To avoid it, users can run nscd or put
5660 'options single-request' in /etc/resolv.conf.
5661 Implemented by Ulrich Drepper.
5665 * The following bugs are resolved with this release:
5667 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5668 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5669 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5670 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5671 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5673 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5674 up at the same time. Implemented by Ulrich Drepper.
5676 * TLS descriptors for LD and GD on x86 and x86-64.
5677 Implemented by Alexandre Oliva.
5679 * getaddrinfo now handles DCCP and UDPlite.
5680 Implemented by Ulrich Drepper.
5682 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5683 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5684 Implemented by Ulrich Drepper.
5686 * New implementation of memmem, strstr, and strcasestr which is O(n).
5687 Implemented by Eric Blake.
5689 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5691 * Implement "e" option for popen to open file descriptor with the
5692 close-on-exec flag set. Implemented by Ulrich Drepper.
5694 * Implement "b" mode for fmemopen. In this mode writes writes don't
5695 implicitly add a NUL byte and seeks from the end of the buffer really
5696 use the buffer end, not the string length as the basis.
5697 Implemented by Ulrich Drepper.
5699 * Many functions, exported and internal, now atomically set the close-on-exec
5700 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5702 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5704 Implemented by Pravin Satpute.
5706 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5710 * The following bugs are resolved with this release:
5712 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5713 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5714 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5715 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5716 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5717 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5718 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5720 * New locales: bo_CN, bo_IN, shs_CA.
5722 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5724 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5725 Implemented by Pravin Satpute.
5727 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5729 * nscd caches now all timeouts for DNS entries
5730 Implemented by Ulrich Drepper.
5732 * nscd is more efficient and wakes up less often.
5733 Implemented by Ulrich Drepper.
5735 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5736 vdprintf, and obstack_vprintf.
5737 Implemented by Jakub Jelinek.
5739 * Faster memset for x86-64.
5740 Implemented by Harsha Jagasia and H.J. Lu.
5742 * Faster memcpy on x86.
5743 Implemented by Ulrich Drepper.
5745 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5746 Implemented by Ulrich Drepper.
5748 * Faster sqrt and sqrtf implemention for some PPC variants.
5749 Implemented by Steven Munroe.
5753 * The following bugs are resolved with this release:
5755 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5756 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5757 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5758 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5759 5071, 5103, 5104, 5112, 5113, 5184, 5186
5761 * More checking functions: fread, fread_unlocked, open*, mq_open.
5762 Implemented by Jakub Jelinek and Ulrich Drepper.
5764 * Extend fortification to C++. Implemented by Jakub Jelinek.
5766 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5767 by not recognizing 'a' as a modifier when those specs are requested.
5768 Implemented by Jakub Jelinek.
5770 * PPC optimizations to math and string functions.
5771 Implemented by Steven Munroe.
5773 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5774 options to be passed. Implemented by Ulrich Drepper.
5776 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5778 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5779 Implemented by Ulrich Drepper.
5781 * Handle private futexes in the NPTL implementation.
5782 Implemented by Jakub Jelinek and Ulrich Drepper.
5784 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5785 Implemented by Roland McGrath and Ulrich Drepper.
5787 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5789 * SHA-256 and SHA-512 based password encryption.
5790 Implemented by Ulrich Drepper.
5792 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5793 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5796 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5797 Implemented by Ulrich Drepper.
5801 * The following bugs are resolved with this release:
5803 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5804 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5805 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5806 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5807 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5808 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5809 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5812 * New Linux interfaces: epoll_pwait, sched_getcpu.
5814 * New generic interfaces: strerror_l.
5816 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5820 * The following bugs are resolved with this release:
5822 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5823 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5824 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5825 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5826 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5827 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5828 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5829 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5830 3225, 3251, 3252, 3253, 3273
5832 * For Linux, the sorting of addresses returned by getaddrinfo now also
5833 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5834 Implemented by Ulrich Drepper.
5836 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5837 Implemented by Ulrich Drepper.
5839 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5841 * New iconv module for MIK. Contributed by Alexander Shopov.
5843 * For sites with broken group and/or passwd database, the auto-propagate
5844 option of nscd can prevent creating ID lookup entries from the results
5845 of a name lookup and vice versa. This usually is no problem but some
5846 site might have problems with the default behavior.
5847 Implemented by Ulrich Drepper.
5849 * Iterating over entire database in NIS can be slow. With the
5850 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5851 to trade time for memory. The entire database will be read at once.
5852 Implemented by Ulrich Drepper.
5854 * The interfaces introduced in RFC 3542 have been implemented by
5857 * Support for the new ELF hash table format was added by Ulrich Drepper.
5859 * Support for priority inheritance mutexes added by Jakub Jelinek and
5862 * Support for priority protected mutexes added by Jakub Jelinek.
5864 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5865 or_IN, csb_PL, fy_NL, sr_ME.
5869 * More overflow detection functions.
5871 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5872 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5874 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5875 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5876 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5877 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5878 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5879 by Masahide Washizawa.
5881 * It is now possible to install audit libraries for the dynamic linker using
5882 LD_AUDIT. Implemented by Ulrich Drepper.
5884 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5885 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5886 For a libc and libpthread that works well on Linux 2.4 kernels, we
5887 recommend using the stable 2.3 branch.
5889 * The new function open_wmemstream acts like open_memstream,
5890 but uses a wchar_t wide character buffer.
5892 * The new function ppoll is an improved version of poll, similar to pselect.
5894 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5895 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5896 renameat, unlinkat, linkat, symlinkat, readlinkat.
5898 * New Linux kernel system calls: unshare,
5899 inotify_init, inotify_add_watch, inotify_rm_watch.
5901 * The euidaccess function is now also known by the alias eaccess,
5902 for compatibility with some other systems.
5904 * Timezone data updated to 2006b version.
5908 * The following bugs are resolved with this release:
5910 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5911 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5912 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5913 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5914 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5915 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5917 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5919 * As of this release, GCC 4 can be used to compile the C Library.
5921 * Timezone data updated to 2005m version.
5925 * The following bugs are resolved with this release:
5927 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5928 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5929 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5930 777, 787, 821, 822, 823, 825
5932 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5936 * Support for RFC 3678. Real implementations exist only for Linux so far.
5937 Implemented by Ulrich Drepper.
5939 * nscd can now cache entries persistently. Expiring entries are reloaded.
5940 For speedups the cache can be shared in memory with client processes.
5941 Implemented by Ulrich Drepper.
5943 * nscd can now perform SELinux checks.
5944 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5946 * getaddrinfo queries are now cached. Canonical name lookup is performed
5948 Implemented by Ulrich Drepper.
5950 * The nothrow function attribute is used when headers are used by gcc when
5951 compiling C code. This can avoid significant amounts of exception
5954 * The malloc functions perform more error checking and are stricter when
5955 it comes to reacting on errors. The default action is to terminate
5956 the process after showing an error message. Implemented by Ulrich Drepper.
5958 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5959 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5961 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5962 namespaces using the new function dlmopen(). This feature is of course,
5963 like most other dynamic loading functionality, not available in statically
5964 linked applications. Implemented by Ulrich Drepper.
5966 * Low-overhead boundary checking variants of string and some stdio functions
5967 were added. These are to be used in conjunction with a gcc patch by
5968 Jakub Jelinek which adds calls to these functions if possible.
5969 Implemented by Jakub Jelinek and Ulrich Drepper.
5971 * Old code for several operating systems and machine architectures that
5972 have not been in working condition in a long time have been removed from
5973 the main source tree maintained by the GNU C Library's maintainers.
5974 These files are now reside in the separate `ports' source module
5975 that is usable as an add-on when building the library.
5979 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5980 interrogate the dynamic linker, compatible with the Solaris interface.
5982 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5983 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5985 * getifaddrs now uses the netlink interface on Linux to get its information.
5986 Implemented by Thorsten Kukuk.
5988 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5989 Implemented by Ulrich Drepper.
5991 * support for non-executable stacks on x86 has been added. Changes mostly
5994 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5997 * getaddrinfo now performs destination address selection according to
6002 * Thread-safe interfaces for many functions that access locale data
6003 were added in version 2.3, but these features were omitted from NEWS.
6004 Many functions have variants with an `_l' suffix that take a `locale_t'
6005 object as a parameter rather than consulting the current locale.
6006 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6007 create and maintain `locale_t' objects. Additionally, the new function
6008 `uselocale' sets "the current locale" (as used by functions not so
6009 parameterized) set for an individual thread. These features were added
6010 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6012 * The functions getresuid, getresgid, setresuid, and setresgid, which
6013 have long been available on Linux, are now declared in <unistd.h>
6014 and are now also available on the Hurd.
6016 * ELF thread-local storage support (TLS) now works on x86-64.
6018 * The new dynamic string token $LIB is expanded in shared library names.
6019 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6021 * Aldy Hernandez contributed complete software floating point support for
6022 PowerPC machines with no FPU.
6024 * fexecve is implemented on Linux.
6026 * The `btowc' function should work at least twice as fast due to
6027 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6029 * With approriate thread add-ons cancelable functions are now implemented
6030 in libc.so as well. No need to call the function in libpthread. This
6031 change allowed to finally disable the incorrect and expensive handling
6032 of weak definition in ld.so.
6034 * Yet more PLT entries in libc.so have been removed. We finally arrived
6035 at the bare minimum. Startup times improved appropriately.
6037 * Support for the new Linux/x86 system call interface was added. The
6038 AT_SYSINFO auxiliary vector entry is recognized and handled.
6042 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6045 * iconv (the program and the interface) now accepts empty names (excluding
6046 options like //TRANSLIT) to mean "use charset of current locale".
6048 * localedef can now transliterate characters in strings which are not in
6049 the provided charmap. The information from the input locale is used.
6051 * Prelinking support was added for ELF targets. This requires additional
6052 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6054 * Read-only stdio streams now use mmap to speed up operation by eliminating
6055 copying and buffer underflows. To use add 'm' to the mode string of
6056 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6058 * The malloc functions were completely rewritten by Wolfram Gloger based
6059 on Doug Lea's malloc-2.7.0.c.
6061 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6062 implementation of regex.
6064 * Bruno Haible upgraded the iconv and locale implementation to support
6067 * Contents of the LC_* and LANG environment variables in the CEN style are
6068 not recognized anymore. It never was used. Change by Ulrich Drepper.
6070 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6071 thread-local storage (TLS) ABI on some platforms.
6072 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6074 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6075 EUC-JISX0213, and TSCII.
6077 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6078 BSD-compatible interface for getting all network interface addresses.
6079 Implementation for IPv4 by Roland McGrath.
6081 * Loading of locale data is faster due to the introduction of a locale
6082 archive. Implemented by Roland McGrath and Ulrich Drepper.
6084 * Startup times are significantly reduced by not using exported functions
6085 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6088 * Steven Munroe contributed a port to PowerPC64/Linux.
6092 * The Hurd now uses the GNU libio implementation of stdio rather than the
6093 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6095 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6096 with the same behavior as the Linux system call of the same name.
6100 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6101 128-bit long double format.
6103 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6104 IBM1161, and IBM1162 charsets.
6106 * Andreas Jaeger contributed a port to x86-64/Linux.
6108 * Peter Bruin contributed a port to PowerPC/Hurd.
6110 * libc functions using I/O streams now can handle wide-oriented streams
6113 * optimizations in the dynamic linker. Binaries created by recent binutils
6114 versions start up quicker due to reduced time spent on relocations.
6116 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6120 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6121 asinh, atanh, j0 for the 128-bit long double format.
6123 * Bruno Haible updated all the code handling Unicode in some form to
6124 support Unicode 3.1.
6126 * Speed of regex for single-byte locales is back to previous levels.
6127 Patch by Isamu Hasegawa.
6129 * Alpha, SPARC, and IA-64 now also using floating stacks.
6131 * Startup time of internationalized applications greatly improved through
6132 iconv cache. Use iconvconfig to generate the cache file.
6133 Contributed by Ulrich Drepper.
6135 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6136 severe performance problems. Patch by David Mosberger.
6138 * The Hurd port got a lot more functionality like AIO, various stdio
6139 extensions, etc. Mainly done by Roland McGrath.
6141 * mtrace can now lookup symbols in shared libraries.
6145 * Intel's IA-64 math library is largely integrated. It provides fast and
6146 accurate implementatations for most basic and standard math functions
6147 in float, double, and long double format.
6149 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6150 and asin for the 96-bit long double format and asin, log, tan for the
6151 128-bit long double format.
6153 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6154 The basic double functions exist today. Contributed by Abraham Ziv
6155 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6156 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6158 * An asynchronous name lookup library was added. The interface is designed
6159 after POSIX AIO. The proposal was circulated beforehand to get comments.
6160 No negative ones came in. Implemented by Ulrich Drepper.
6162 * Port to S390/64bit contributed by Martin Schwidefsky
6163 <schwidefsky@de.ibm.com>.
6165 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6166 of functions for Linux/IA-64.
6168 * The RPC code is now thread safe. Threads can now use the same service
6169 of different services at the same time. Patch by Eric Norum
6170 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6172 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6173 family of functions for Linux/S390.
6175 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6176 of functions for Linux/x86.
6178 * Port to Linux/CRIS contributed by Axis Communications.
6182 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6183 we can now check for namespace violations and missing declarations. The
6184 result is that almost all headers are now Unix-compliant (as defined in
6185 the upcoming XPG6). The negative side is that some programs might need
6186 corrections, too, if they depend on the incorrect form of the headers in
6187 previous versions which defined too many symbols and included too many
6190 * regex now handles multibyte character sets correctly.
6191 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6193 * iconv (the program) does now conform to the upcoming XPG6 and handles
6194 charmaps. Instead of the charset names the path of charmaps can be
6195 provided and the conversion happens based on this data.
6196 Contributed by Ulrich Drepper.
6198 * The locale program now provides detailed information about the installed
6203 only lists the names of the supported locales
6207 provides details such as country, language, and codeset name.
6208 Contributed by Ulrich Drepper.
6212 * The gencat program now parses the input file according to the charset
6213 selected by the LC_CTYPE category. This is important for stateful
6214 character sets. To make generating catalogs easier there is a way
6215 to overwrite the charset selected by the locale: before the first
6216 message or $ quote line the catalog can contain a line like
6218 $ codeset=ISO-8859-2
6220 to select the charset (ISO-8859-2 in this case).
6222 Implemented by Shinya Hanataka and Ulrich Drepper.
6224 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6225 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6226 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6228 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6229 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6231 * The LANGUAGE environment variable is now ignored unless the locale is
6232 changed from the default "C" locale.
6234 * The usual bug fixes.
6238 * Greg McGary added runtime support for bounds checking using gcc's
6239 new -fbounded-pointers option. ix86 target is complete. PowerPC
6242 * Thorsten Kukuk added secure mode support to nscd.
6244 * The Berkeley db libraries have been removed.
6246 Related, the nss_db module is now in a separate package since it
6247 obviously requires a database library being available.
6249 * Wide character I/O streams implemented by Ulrich Drepper.
6251 * Functions from the extended socket API added by Ulrich Drepper.
6253 * Functions feenableexcept and fedisableexcept to control the
6254 behaviour of individual exceptions have been added by Andreas Jaeger.
6256 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6258 * The resolver code has been updated from bind 8.2.3-T5B which supports
6259 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6262 This change could in some situations effect backward compatibility. Since
6263 now `_res' is a thread-local instead of a global variable, modifying it
6264 in one thread does not have any effect in other threads.
6266 The resolver library was also extended to allow IPv6 as the transport
6267 protocol for the requests. This work was done by Stig Venaas.
6269 * Compatibility code for K&R C compilers has been removed from the
6270 header files. A ISO C compiler is needed to use the library
6271 (conforming to either C89 or C99 standard).
6273 * Complete rewrite of the localedef program to support multibyte character
6274 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6275 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6276 Implemented by Ulrich Drepper.
6278 Bruno Haible significantly improved the generation and use of the data
6279 structures for the wide character tables.
6281 * Plural handling in gettext implemented by Ulrich Drepper.
6283 * The utmp daemon has been removed.
6285 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6287 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6290 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6292 * POSIX barriers implemented by Kaz Kylheku.
6294 * POSIX spawn function family implemented by Ulrich Drepper.
6296 * POSIX spinlocks are now available.
6298 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6300 * the configure option --enable-kernel=X.Y.Z allows to strip out
6301 compatibility for kernel versions before X.Y.Z. This is currently only
6302 implemented for Linux.
6304 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6305 field sin6_scope_id. This means that all programs using IPv6 should be
6306 recompiled. Don't expect binary compatibility with previous glibc
6309 * various conversion modules for IBM character sets contributed by
6312 * IA-64 port by Jes Sorensen and HJ Lu.
6326 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6328 * New xdr functions are added; some rpc functions are now 64bit clean.
6330 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6332 * Fixed known incompatibilities with glibc 2.0.
6334 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6336 * Optimized a number of functions (especially the ELF dynamic loader).
6338 * Update timezone data files.
6340 * lots of charmaps corrections
6342 * some new locale definitions and charmaps
6347 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6348 conform to POSIX member type requirements. Symbol versions have been
6349 adjusted as needed within the library, and for direct use by applications,
6350 but there is potential for problems if third-party libraries use
6351 struct timeval as part of their interface. This does not present
6352 a problem for X and other "essential" system libraries.
6354 * An additional locale model to support C++ Standard Library locale
6355 model and probably more was implemented by Ulrich Drepper.
6357 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6360 * Miles Bader provided the `argp' function family to support hierachical
6361 command line argument parsing, layered on top of getopt.
6363 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6365 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6368 * scanf recognizes the %a and %A format for scanning floating point numbers.
6370 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6371 information and interfaces for the available integer types.
6373 * about 130 new math functions were added to implement the ISO C9x math
6376 * the new header <complex.h> contains definitions of the complex math
6377 functions from ISO C 9X.
6379 * the new header <tgmath.h> defines generic macros to use complex or
6380 real valued functions.
6382 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6384 * Andreas Jaeger provided a test suite for the math library.
6386 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6388 * Ulrich Drepper added character set conversion functions (iconv).
6390 * Optimized string functions have been added.
6392 * The localedata addon is now part of glibc.
6394 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6396 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6397 daemon for NSS (nscd).
6399 Missing a better place here are some numbers on improvements. Under
6400 Linux 2.1.125 un-tar-ing the kernel sources takes
6404 using local files 12.19s 6.88s 22.91s
6406 using NIS 13.92s 8.91s 26.34s
6408 using NIS & nscd 10.37s 7.34s 25.30s
6410 using NIS+ 27.57s 30.37s 640.46s
6412 using NIS+ & nscd 10.25s 7.83s 26.51s
6414 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6416 Keep in mind that non-namelookup related operations dominate above times.
6417 It was just a common complain that using NIS+ unpacking the kernel is
6420 [1] The old nscd implementation is not available anymore since it was
6421 distributed with glibc up to version 2.0.98 and thus is now replaced.
6423 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6425 * Mark Kettenis provided a Hesiod NSS module.
6427 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6428 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6430 * rcmd can now handle netgroups (Dick Streefland).
6432 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6435 * Support for the IPv6 protocol has been added to the socket API, as per the
6436 latest draft standards.
6438 * Support for Linux 2.2 has been added.
6440 * Interface changes relative to the latest 2.0.x release:
6441 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6442 addseverity NEW: Unix98
6443 alphasort64 NEW: LFS
6444 argp_err_exit_status NEW: argp, GNU ext
6445 argp_error NEW: argp, GNU ext
6446 argp_failure NEW: argp, GNU ext
6447 argp_help NEW: argp, GNU ext
6448 argp_parse NEW: argp, GNU ext
6449 argp_program_bug_address NEW: argp, GNU ext
6450 argp_program_version NEW: argp, GNU ext
6451 argp_program_version_hook NEW: argp, GNU ext
6452 argp_state_help NEW: argp, GNU ext
6453 argp_usage NEW: argp, GNU ext
6454 authdes_create NEW: Secure RPC
6455 authdes_getucred NEW: Secure RPC
6456 authdes_pk_create NEW: Secure RPC
6457 backtrace NEW: GNU ext.
6458 backtrace_symbols NEW: GNU ext.
6459 backtrace_symbols_fd NEW: GNU ext.
6461 cacosf NEW: ISO C 9x
6462 cacosh NEW: ISO C 9x
6463 cacoshf NEW: ISO C 9x
6464 cacoshl NEW: ISO C 9x
6465 cacosl NEW: ISO C 9x
6472 casinf NEW: ISO C 9x
6473 casinh NEW: ISO C 9x
6474 casinhf NEW: ISO C 9x
6475 casinhl NEW: ISO C 9x
6476 casinl NEW: ISO C 9x
6478 catanf NEW: ISO C 9x
6479 catanh NEW: ISO C 9x
6480 catanhf NEW: ISO C 9x
6481 catanhl NEW: ISO C 9x
6482 catanl NEW: ISO C 9x
6483 cbc_crypt NEW: Secure RPC
6487 ccoshf NEW: ISO C 9x
6488 ccoshl NEW: ISO C 9x
6494 cimagf NEW: ISO C 9x
6495 cimagl NEW: ISO C 9x
6496 clearerr_locked REMOVED
6497 clntunix_create NEW: sunrpc ext
6499 clog10 NEW: ISO C 9x
6500 clog10f NEW: ISO C 9x
6501 clog10l NEW: ISO C 9x
6511 cprojf NEW: ISO C 9x
6512 cprojl NEW: ISO C 9x
6514 crealf NEW: ISO C 9x
6515 creall NEW: ISO C 9x
6520 csinhf NEW: ISO C 9x
6521 csinhl NEW: ISO C 9x
6524 csqrtf NEW: ISO C 9x
6525 csqrtl NEW: ISO C 9x
6529 ctanhf NEW: ISO C 9x
6530 ctanhl NEW: ISO C 9x
6532 des_setparity NEW: Secure RPC
6533 ecb_crypt NEW: Secure RPC
6534 endutxent NEW: Unix98
6536 exp10f NEW: ISO C 9x
6537 exp10l NEW: ISO C 9x
6541 fattach NEW: STREAMS
6542 fdetach NEW: STREAMS
6546 feclearexcept NEW: ISO C 9x
6547 fegetenv NEW: ISO C 9x
6548 fegetexceptflag NEW: ISO C 9x
6549 fegetround NEW: ISO C 9x
6550 feholdexcept NEW: ISO C 9x
6552 feraiseexcept NEW: ISO C 9x
6553 ferror_locked REMOVED
6554 fesetenv NEW: ISO C 9x
6555 fesetexceptflag NEW: ISO C 9x
6556 fesetround NEW: ISO C 9x
6557 fetestexcept NEW: ISO C 9x
6558 feupdateenv NEW: ISO C 9x
6559 fflush_locked REMOVED
6563 fgets_unlocked NEW: GNU ext.
6564 fileno_locked REMOVED
6576 fputc_locked REMOVED
6577 fputs_unlocked NEW: GNU ext.
6578 fread_unlocked NEW: GNU ext.
6583 fstatvfs NEW: Unix98
6587 ftruncate64 NEW: LFS
6589 fwrite_unlocked NEW: GNU ext.
6590 gai_strerror NEW: IPv6
6594 getchar_locked REMOVED
6596 getdate_err NEW: Unix98
6597 getdate_r NEW: GNU ext.
6599 getnameinfo NEW: IPv6
6600 getnetname NEW: Secure RPC
6601 getpmsg NEW: STREAMS
6602 getpt NEW: Unix98 PTY
6603 getrlimit64 NEW: LFS
6604 getutxent NEW: Unix98
6605 getutxid NEW: Unix98
6606 getutxline NEW: Unix98
6607 glob64 NEW: GNU ext.
6608 globfree64 NEW: GNU ext.
6609 gnu_get_libc_release NEW: GNU ext.
6610 gnu_get_libc_version NEW: GNU ext.
6611 grantpt NEW: Unix98 PTY
6612 host2netname NEW: Secure RPC
6614 iconv_close NEW: iconv
6615 iconv_open NEW: iconv
6616 if_freenameindex NEW: IPv6
6617 if_indextoname NEW: IPv6
6618 if_nameindex NEW: IPv6
6619 if_nametoindex NEW: IPv6
6620 in6addr_any NEW: IPv6
6621 in6addr_loopback NEW: IPv6
6622 inet6_isipv4mapped NEW: IPv6
6623 isastream NEW: STREAMS
6624 iswblank NEW: GNU ext.
6625 key_decryptsession NEW: Secure RPC
6626 key_decryptsession_pk NEW: Secure RPC
6627 key_encryptsession NEW: Secure RPC
6628 key_encryptsession_pk NEW: Secure RPC
6629 key_gendes NEW: Secure RPC
6630 key_get_conv NEW: Secure RPC
6631 key_secretkey_is_set NEW: Secure RPC
6632 key_setnet NEW: Secure RPC
6633 key_setsecret NEW: Secure RPC
6634 llrint NEW: ISO C 9x
6635 llrintf NEW: ISO C 9x
6636 llrintl NEW: ISO C 9x
6637 llround NEW: ISO C 9x
6638 llroundf NEW: ISO C 9x
6639 llroundl NEW: ISO C 9x
6644 lrintf NEW: ISO C 9x
6645 lrintl NEW: ISO C 9x
6646 lround NEW: ISO C 9x
6647 lroundf NEW: ISO C 9x
6648 lroundl NEW: ISO C 9x
6650 makecontext NEW: Unix98
6651 mempcpy NEW: GNU ext.
6654 modify_ldt NEW: kernel
6658 nearbyint NEW: ISO C 9x
6659 nearbyintf NEW: ISO C 9x
6660 nearbyintl NEW: ISO C 9x
6661 netname2host NEW: Secure RPC
6662 netname2user NEW: Secure RPC
6663 nexttoward NEW: ISO C 9x
6664 nexttowardf NEW: ISO C 9x
6665 nexttowardl NEW: ISO C 9x
6669 passwd2des NEW: Secure RPC
6671 pow10f NEW: GNU ext.
6672 pow10l NEW: GNU ext.
6675 printf_size NEW: GNU ext.
6676 printf_size_info NEW: GNU ext.
6677 profil_counter REMOVED
6678 pthread_mutexattr_getkind_np REPLACED
6679 pthread_mutexattr_setkind_np REPLACED
6680 ptsname NEW: Unix98 PTY
6681 ptsname_r NEW: Unix98 PTY
6683 putchar_locked REMOVED
6684 putgrent NEW: GNU ext.
6686 putpmsg NEW: STREAMS
6687 pututxline NEW: Unix98
6691 readdir64_r NEW: LFS
6692 remquo NEW: ISO C 9x
6693 remquof NEW: ISO C 9x
6694 remquol NEW: ISO C 9x
6696 roundf NEW: ISO C 9x
6697 roundl NEW: ISO C 9x
6699 scalbln NEW: ISO C 9x
6700 scalblnf NEW: ISO C 9x
6701 scalblnl NEW: ISO C 9x
6703 sendfile NEW: kernel
6704 setcontext NEW: Unix98
6705 setrlimit64 NEW: LFS
6706 setutxent NEW: Unix98
6708 sigignore NEW: Unix98
6709 sigqueue NEW: POSIX.1b
6710 sigrelse NEW: Unix98
6711 sigset NEW: POSIX.1b
6712 sigtimedwait NEW: POSIX.1b
6713 sigwaitinfo NEW: POSIX.1b
6714 sincos NEW: GNU ext.
6715 sincosf NEW: GNU ext.
6716 sincosl NEW: GNU ext.
6720 strcasestr NEW: GNU ext.
6721 strtoimax NEW: ISO C 9x
6722 strtoumax NEW: ISO C 9x
6723 strverscmp NEW: GNU ext.
6724 svcauthdes_stats NEW: Secure RPC
6725 svcunix_create NEW: sunrpc etx
6726 svcunixfd_create NEW: sunrpc ext
6727 swapcontext NEW: Unix98
6728 tcgetsid NEW: Unix98 PTY
6729 tdestroy NEW: GNU ext.
6730 tgamma NEW: ISO C 9x
6731 tgammaf NEW: ISO C 9x
6732 tgammal NEW: ISO C 9x
6736 truncf NEW: ISO C 9x
6737 truncl NEW: ISO C 9x
6739 unlockpt NEW: Unix98 PTY
6740 updwtmpx NEW: Unix98
6741 user2netname NEW: Secure RPC
6742 utmpxname NEW: Unix98
6743 versionsort NEW: GNU ext.
6744 versionsort64 NEW: GNU ext.
6746 wcscasecmp NEW: GNU ext.
6747 wcsncasecmp NEW: GNU ext.
6748 wcsnlen NEW: GNU ext.
6749 wcstoimax NEW: ISO C 9x
6750 wcstoll NEW: ISO C 9x
6751 wcstoull NEW: ISO C 9x
6752 wcstoumax NEW: ISO C 9x
6754 wordexp NEW: POSIX.2
6755 wordfree NEW: POSIX.2
6756 write_profiling REMOVED
6757 xdecrypt NEW: Secure RPC
6758 xdr_authdes_cred NEW: Secure RPC
6759 xdr_authdes_verf NEW: Secure RPC
6760 xdr_cryptkeyarg NEW: Secure RPC
6761 xdr_cryptkeyarg2 NEW: Secure RPC
6762 xdr_cryptkeyres NEW: Secure RPC
6763 xdr_getcredres NEW: Secure RPC
6764 xdr_key_netstarg NEW: Secure RPC
6765 xdr_key_netstres NEW: Secure RPC
6766 xdr_keybuf NEW: Secure RPC
6767 xdr_keystatus NEW: Secure RPC
6768 xdr_netnamestr NEW: Secure RPC
6769 xdr_sizeof NEW: Secure RPC
6770 xdr_unixcred NEW: sunrpc ext
6771 xencrypt NEW: Secure RPC
6772 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6783 * inet_ntoa is thread-safe
6785 * updwtmp is moved from libutil to libc
6787 * rewrite of cbrt function
6789 * update of timezone data
6803 * add atoll function
6805 * fix complex problems in Berkeley DB code
6807 * fix math functions
6811 * fixed lots of header problems (especially Linux/GNU specific)
6813 * dynamic loader preserves all registers
6815 * Roland McGrath provided support for handling of auxiliary objects in
6816 the ELF dynamic loader.
6818 * support for parallel builds is improved
6822 * GNU extensions are no longer declared by default. To enable them you
6823 must define the macro `_GNU_SOURCE' in your program or compile with
6826 * The library has changed from using GNU ld symbol aliases to using weak
6827 symbols where available. The ELF object file format supports weak
6828 symbols; GNU ld also supports weak symbols in the a.out format. (There
6829 is also now support for other GNU ld extensions in ELF. Use the
6830 `--with-elf' option to configure to indicate you have ELF, and
6831 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6832 of many files which contained only symbol aliases, reducing the size of
6833 the source and the compiled library; many other files were renamed to
6834 less cryptic names previously occupied by the symbol alias files.
6835 There is a new header file <elf.h> for programs which operate on
6836 files in the ELF format.
6838 * Converted to Autoconf version 2, so `configure' has more options.
6839 Run `configure --help' to see the details.
6841 * The library can now be configured to build profiling, highly-optimized
6842 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6843 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6844 `configure' enable building these extra libraries. The shared library is
6845 built by default when using both ELF and GNU ld. When shared libraries
6846 are enabled, the new library `-ldl' is available for arbitrary run-time
6847 loading of shared objects; its interface is defined in <dlfcn.h>. The
6848 new header file <link.h> gives access to the internals of the run-time
6849 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6850 application of same name on other systems and it provides information
6851 about dynamically linked binaries.
6853 * The C library now provides the run-time support code for profiling
6854 executables compiled with `-pg'. Programs can control the profiling code
6855 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6856 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6857 the support for this file format was contributed by David Mosberger-Tang.
6859 * The math code has been replaced with a math library based on fdlibm from
6860 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6861 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6862 functions. The math functions now reside in a separate library, so
6863 programs using them will need to use `-lm' their linking commands.
6865 * John C. Bowman contributed optimized ix87 assembler inline functions.
6867 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6868 mechanism similar to that found in Solaris 2. This is now used for the
6869 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6870 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6871 file controls what services are used for each individual database. This
6872 works by loading shared libraries with names specified in `nsswitch.conf',
6873 so service modules can be changed or added at any time without even
6874 relinking any program. Currently there are the file, db, and NIS based
6875 NSS services available.
6877 * The new functions `strtoq' and `strtouq' parse integer values from
6878 strings, like `strtol' and `strtoul', but they return `long long int' and
6879 `unsigned long long int' values, respectively (64-bit quantities).
6881 * The new functions `strtof' and `strtold' parse floating-point values from
6882 strings, like `strtod', but they return `float' and `long double' values,
6883 respectively (on some machines `double' and `long double' are the same).
6885 * Ulrich Drepper has contributed new implementations of the floating-point
6886 printing and reading code used in the `printf' family of functions and
6887 `strtod', `strtof', and `strtold'. These new functions are perfectly
6888 accurate, and much faster than the old ones.
6890 * The implementation of the POSIX locale model was completely rewritten by
6891 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6892 to compile the POSIX locale definition.
6894 * The former dummy implementations of the strcoll and strxfrm function are
6895 now replaced by fully functional code contributed by Ulrich Drepper. The
6896 collation information comes from the POSIX locale definitions.
6898 * The new header <langinfo.h> defines an interface for accessing
6899 various locale-dependent data (using the locale chosen with `setlocale').
6901 * Ulrich Drepper has contributed a new suite of functions for operation on
6902 wide-character and multibyte-character strings, in <wchar.h>;
6903 and classification and case conversion of wide characters, in <wctype.h>.
6904 These new functions are conforming to the ISO C, Amendement 1 specification.
6906 * There is now a second implementation of the standard I/O library available.
6907 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6908 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6910 * You can now use positional parameter specifications in format strings
6911 for the `printf' and `scanf' families of functions. For example,
6912 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6913 ``Number 6, Mr Jones''. This is mainly useful when providing different
6914 format strings for different languages, whose grammars may dictate
6915 different orderings of the values being printed. To support this
6916 feature, the interface for `register_printf_handler' has changed; see
6917 the header file <printf.h> for details.
6919 * The `printf' and `scanf' families of functions now understand a new
6920 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6921 to group numbers as indicated by the locale; for `scanf' and friends, this
6922 says to accept as valid only a number with all the proper grouping
6923 separators in the right places. In the default "C" locale, numbers are
6924 not grouped; but locales for specific countries will define the usual
6925 conventions (i.e. separate thousands with `,' in the US locale).
6927 * The pgrp functions have been regularized, slightly incompatibly but much
6928 less confusingly. The core functions are now `getpgid' and `setpgid',
6929 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6930 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6931 provided for compatibility. There is no longer an incompatible `getpgrp'
6932 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6934 * The new header file <fts.h> and suite of functions simplify programs that
6935 operate on directory trees. This code comes from 4.4 BSD.
6937 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6938 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6939 NSS scheme used in glibc.
6941 * There is a new malloc debugging hook `__memalign_hook'.
6943 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6944 `unsigned int' in <sys/types.h>. These are for compatibility only and
6945 their use is discouraged.
6947 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6948 done differently, so that it works even without GNU ld.
6950 * New function `euidaccess' checks allowed access to a file like `access',
6951 but using the effective IDs instead of the real IDs.
6953 * The time zone data files have been updated for the latest and greatest
6954 local time conventions of the countries of the world.
6956 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6959 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6960 for formatting floating-point numbers. They are provided only for
6961 compatibility; new programs should use `sprintf' instead. There are
6962 also equivalent function for the `long double' floating-point type and
6963 all functions also exist in a reentrant form.
6965 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6966 functions for maintaining the login-record files (primarily of use to
6967 system programs such as `login'), and convenient functions for
6968 allocating and initializing a pseudo-terminal (pty) device.
6970 * Ulrich Drepper has contributed new support for System V style
6971 shared memory and IPC on systems that support it.
6973 * Ulrich Drepper has contributed several miscellaneous new functions found
6974 in System V: The `hsearch' family of functions provide an effective
6975 implementation of hash tables; `a64l' and `l64a' provide a very simple
6976 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6979 * Ulrich Drepper has contributed new reentrant counterparts for the
6980 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6982 * Ulrich Drepper has contributed new, highly-optimized versions of several
6983 string functions for the i486/Pentium family of processors.
6985 * Ulrich Drepper has updated the Linux-specific code, based largely
6986 on work done in Hongjiu Lu's version of GNU libc for Linux.
6987 The GNU library now supports Linux versions 2.0.10 and later,
6988 using the ELF object file format (i[3456]86-*-linux).
6990 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6992 * David Mosberger-Tang and Richard Henderson have ported the C library
6993 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6994 dynamic linking support for ELF/Alpha.
6996 * Richard Henderson contributed several Alpha optimized assembler function
6997 for arithmetic and string handling.
6999 * Ulrich Drepper has contributed a new set of message catalog functions to
7000 support multiple languages using the <libintl.h> interface, for use with
7001 his new package GNU gettext. Translation volunteers have contributed
7002 catalogs of the library's messages in Spanish, German, and Korean.
7004 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7005 program and the `catgets' function for reading the catalog files it
7006 creates. (The <libintl.h> interface is preferred; we include the
7007 <nl_types.h> interface using `catgets' only for source compatibility with
7008 programs already written to use it.)
7010 * New header file <values.h> gives SVID-compatible names for <limits.h>
7013 * Various new macros, declarations, and small header files for compatibility
7016 * New function `group_member' is a convenient way to check if a process has
7017 a given effective group ID.
7019 * When using GCC 2.7 and later, the socket functions are now declared in a
7020 special way so that passing an argument of type `struct sockaddr_in *',
7021 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7022 `struct sockaddr *' type, does not generate a type-clash warning.
7024 * New function `error' declared in header file <error.h> is a convenient
7025 function for printing error messages and optionally exiting; this is the
7026 canonical function used in GNU programs. The new functions `err', `warn',
7027 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7028 doing the same thing.
7030 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7031 POSIX.2 `glob' function to do ~ and {...} expansion.
7033 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7034 `clearenv' which is used in POSIX.9 is also available.
7036 * New function `getsid' returns session ID number on systems that support it.
7038 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7039 files <db.h> and <mpool.h> provide a rich set of functions for several
7040 types of simple databases stored in memory and in files, and <ndbm.h> is
7041 an old `ndbm'-compatible interface using the `db' functions. Link with
7042 `-ldb' to get these functions.
7044 * New macro `strdupa' copies a string like `strdup', but uses local stack
7045 space from `alloca' instead of dynamic heap space from `malloc'.
7047 * New function `strnlen' is like `strlen' but searches only a given maximum
7048 number of characters for the null terminator. `stpncpy', `strndup' and
7049 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7052 * New function `statfs' in header <sys/statfs.h>.
7054 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7055 provide convenient functions for operating on blocks of null-terminated
7058 * A new suite of functions in <utmp.h> handle all the details of reading
7059 and writing the utmp file.
7061 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7064 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7065 completely POSIX compliant and also implemented the extended functionality
7066 to handle alternate digit representation and alternate era date formats.
7068 * Ulrich Drepper provided an implementation of the `strptime' function
7069 defined in XPG4.2 which transforms a string into a `struct tm' value.
7071 * Paul Eggert provided the tzselect shell script as part of the timezone
7072 code. The shell script makes it easy to select the correct timezone
7075 * The implementation of the malloc family of functions is completely replaced
7076 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7077 The implementation uses the mmap function (if available) and it is
7078 optimized for the use in multi threaded programs.
7080 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7081 functions. This new functionality is usable by specifying a special
7082 salt string and it is compatible with implementation on *BSD systems.
7084 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7085 `getsubopt' to handle second level command line options, `bsd_signal'
7086 to access BSD style `signal' functionality, the obsolete `regexp' style
7089 * the `lchown' function is available on system which support this
7092 * The implementation of the shadow password handling function was contributed
7095 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7097 * POSIX.1g support was added. The <sys/select.h> header is available,
7098 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7099 implementation of `getaddrinfo'.
7103 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7105 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7106 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7108 * The new function `daemon' from 4.4 BSD is useful for server programs that
7109 want to put themselves in the background.
7111 * Joel Sherrill has contributed support for several standalone boards that
7112 run without an operating system.
7114 * `printf', `scanf' and friends now accept a `q' type modifier for long
7115 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7117 * All of the code taken from BSD (notably most of the math and networking
7118 routines) has been updated from the BSD 4.4-Lite release.
7120 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7122 * The new functions `getdomainname' and `setdomainname' fetch or change the
7123 YP/NIS domain name. These are system calls which exist on systems which
7126 * The time zone data files have been updated for the latest international
7129 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7130 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7134 * The C library now includes support for Sun RPC, from Sun's free
7135 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7136 are included. (There is still no support for YP.)
7138 * Tom Quinn has contributed a port of the C library to SGI machines running
7139 Irix 4 (mips-sgi-irix4).
7141 * The new `lockf' function is a simplified interface to the locking
7142 facilities of `fcntl', included for compatibility.
7144 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7146 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7148 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7151 * The error message printed by `assert' for a failed assertion now includes
7152 the name of the program (if using GNU ld) and the name of the calling
7153 function (with versions of GCC that support this).
7155 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7157 * The library now includes the <sys/mman.h> header file and memory
7158 management functions `mmap', `munmap', `mprotect', `msync', and
7159 `madvise', on systems that support those facilities.
7161 * The interface for `mcheck' has changed slightly: the function called to
7162 abort the program when an allocation inconsistency is detected now takes
7163 an argument that indicates the type of failure. The new function
7164 `mprobe' lets you request a consistency check for a particular block at
7165 any time (checks are normally done only when you call `free' or `realloc'
7168 * It is now possible to easily cross-compile the C library, building on one
7169 system a library to run on another machine and/or operating system. All
7170 you need to do is set the variable `HOST_CC' in `configparms' to the
7171 native compiler for programs to run on the machine you are building on (a
7172 few generator programs are used on Unix systems); set `CC' to the
7175 * The new function `fexecve' (only implemented on the GNU system) executes
7176 a program file given a file descriptor already open on the file.
7180 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7181 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7183 * You can set the variable `libprefix' in `configparms' to specify a prefix
7184 to be prepended to installed library files; this makes it easy to install
7185 the GNU C library to be linked as `-lgnuc' or whatever.
7187 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7188 copies a limited number of characters from a string, and returns the
7189 address of the last character written.
7191 * You no longer need to check for whether the installed `stddef.h' is
7192 compatible with the GNU C library. configure now checks for you.
7194 * You can now define a per-stream `fileno' function to convert the
7195 stream's cookie into an integral file descriptor.
7197 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7198 allocates zero bytes of storage, and returns a unique pointer which
7199 you can pass to `realloc' or `free'. The behavior is undefined if
7200 you dereference this pointer.
7202 * The C library now runs on Sony NEWS m68k machines running either
7203 NewsOS 3 or NewsOS 4.
7205 * The new `syscall' function is a system-dependent primitive function
7206 for invoking system calls. It has the canonical behavior on Unix
7207 systems, including unreliable return values for some calls (such as
7208 `pipe', `fork' and `getppid').
7210 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7211 to `EAGAIN', which is the preferred name. On systems whose kernels
7212 use two distinct codes, the C library now translates EWOULDBLOCK to
7213 EAGAIN in every system call function.
7217 * The GNU C Library Reference Manual is now distributed with the library.
7218 `make dvi' will produce a DVI file of the printed manual.
7219 `make info' will produce Info files that you can read on line using C-h i
7220 in Emacs or the `info' program.
7221 Please send comments on the manual to bug-glibc-manual@gnu.org.
7223 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7225 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7227 * Jason Merrill has contributed a port to the Sequent Symmetry running
7228 Dynix version 3 (i386-sequent-dynix).
7230 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7231 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7233 * New function `memory_warnings' lets you arrange to get warnings when
7234 malloc is running out of memory to allocate, like Emacs gives you.
7236 * The C library now contains the relocating allocator used in Emacs 19 for
7237 its editing buffers. This allocator (ralloc) minimizes allocation
7238 overhead and fragmentation by moving allocated regions around whenever it
7239 needs to. You always refer to a ralloc'd region with a "handle" (a
7240 pointer to a pointer--an object of type `void **').
7242 * There is a new `printf' format: `%m' gives you the string corresponding
7243 to the error code in `errno'.
7245 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7246 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7247 pass, the `a' modifier says to fill in a `char **' you pass with a
7250 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7251 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7252 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7254 * `mkstemp' is a traditional Unix function to atomically create and open a
7255 uniquely-named temporary file.
7259 * The standard location for the file that says what the local timezone is
7260 has changed again. It is now `/usr/local/etc/localtime' (or more
7261 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7263 * The distribution no longer contains any files with names longer than 14
7266 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7267 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7269 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7273 * The configuration process has changed quite a bit. The `configure'
7274 script is now used just like the configuration scripts for other GNU
7275 packages. The `sysdeps' directory hierarchy is much rearranged.
7276 The file `INSTALL' explains the new scheme in detail.
7278 * The header files no longer need to be processed into ANSI C and
7279 traditional C versions. There is just one set of files to install, and
7280 it will work with ANSI or old C compilers (including `gcc -traditional').
7282 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7283 MIPS DECStation running Ultrix 4.
7285 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7286 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7287 made itself into a shared library.
7289 * Yet further improved support for the i386, running 4.3 BSD-like systems
7290 (such as Mach 3 with the Unix single-server), or System V.
7292 * New function `strncasecmp' to do case-insensitive string comparison
7293 with limited length.
7295 * New function `strsep' is a reentrant alternative to `strtok'.
7297 * New functions `scandir' and `alphasort' for searching directories.
7299 * New function `setenv' is a better interface to `putenv'.
7301 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7302 function for traversing a directory tree.
7304 * The GNU obstack package is now also part of the C library.
7305 The new function `open_obstack_stream' creates a stdio stream that
7306 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7307 formatted output directly to an obstack.
7309 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7310 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7312 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7314 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7315 things to your strings.
7317 * There are some new test programs: test-fseek, testmb, and testrand.
7319 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7320 These ports are not finished, but are a good starting place for really
7321 supporting those systems.
7323 * `/etc/localtime' is now the standard location for the file that says what
7324 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7325 This follows the general principle that `/etc' is the place for all local
7326 configuration files.
7328 * The C library header files now use `extern "C"' when used by the C++
7329 compiler, so the C library should now work with C++ code.
7331 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7332 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7335 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7336 function which uses the `merge sort' algorithm, and is said to be
7337 significantly faster than the old GNU `qsort' function. Merge sort is
7338 now the standard `qsort' function. The new algorithm can require a lot
7339 of temporary storage; so, the old sorting function is called when the
7340 required storage is not available.
7342 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7343 provides the Unix `crypt' function, plus some other entry points.
7345 * The code and header files taken from 4.4 BSD have been updated with the
7346 latest files released from Berkeley.
7348 ----------------------------------------------------------------------
7351 Permission is granted to anyone to make or distribute verbatim copies
7352 of this document as received, in any medium, provided that the
7353 copyright notice and this permission notice are preserved,
7354 thus giving the recipient permission to redistribute in turn.
7356 Permission is granted to distribute modified versions
7357 of this document, or of portions of it,
7358 under the above conditions, provided also that they
7359 carry prominent notices stating who last changed them.
7362 version-control: never