1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2022 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 [Add new features here]
14 Deprecated and removed features, and other changes affecting compatibility:
16 [Add deprecations, removals and changes affecting compatibility here]
18 Changes to build and runtime requirements:
20 [Add changes to build and runtime requirements here]
22 Security related changes:
24 [Add security related changes here]
26 The following bugs are resolved with this release:
28 [The release manager will add the list generated by
29 scripts/list-fixed-bugs.py just before the release.]
35 * Support for DT_RELR relative relocation format has been added to
36 glibc. This is a new ELF dynamic tag that improves the size of
37 relative relocations in shared object files and position independent
38 executables (PIE). DT_RELR generation requires linker support for
39 -z pack-relative-relocs option, which is supported for some targets
40 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
42 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
43 have been added. The pidfd functionality provides access to a process
44 while avoiding the issue of PID reuse on tranditional Unix systems.
46 * On Linux, the process_madvise function has been added. It has the
47 same functionality as madvise but alters the target process identified
50 * On Linux, the process_mrelease function has been added. It allows a
51 caller to release the memory of a dying process. The release of the
52 memory is carried out in the context of the caller, using the caller's
53 CPU affinity, and priority with CPU usage accounted to the caller.
55 * The “no-aaaa” DNS stub resolver option has been added. System
56 administrators can use it to suppress AAAA queries made by the stub
57 resolver, including AAAA lookups triggered by NSS-based interfaces
58 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
59 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
60 produce IPv6 addresses, and configured IPv6 name servers are still
61 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
62 are translated to A queries. The new resolver option is intended
63 primarily for diagnostic purposes, to rule out that AAAA DNS queries
64 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
65 validation by applications.
67 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
68 and mount_setattr have been added. They are part of the new Linux kernel
69 mount APIs that allow applications to more flexibly configure and operate
70 on filesystem mounts. The new mount APIs are specifically designed to work
73 * localedef now accepts locale definition files encoded in UTF-8.
74 Previously, input bytes not within the ASCII range resulted in
77 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
78 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
79 Support for the char8_t typedef has been added per the ISO C2X N2653
80 proposal. The functions are declared in uchar.h in C2X mode or when the
81 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
82 The char8_t typedef is declared in uchar.h in C2X mode or when the
83 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
84 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
86 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
87 added. The functions wrap getrandom and/or /dev/urandom to return high-
88 quality randomness from the kernel.
90 * Support for LoongArch running on Linux has been added. This port requires
91 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
94 - loongarch64-linux-gnu
96 The LoongArch ABI is 64-bit little-endian.
98 Deprecated and removed features, and other changes affecting compatibility:
100 * Support for prelink will be removed in the next release; this includes
101 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
102 variables and their functionality in the dynamic loader.
104 * The Linux kernel version check has been removed along with the
105 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
106 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
107 when libc.so is issued directly.
109 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
111 The following bugs are resolved with this release:
113 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
114 return different result with versioned "foo"
115 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
117 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
118 ./exe and ld.so adjusts argv on the stack
119 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
121 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
122 consuming the second byte of certain double byte characters
123 [25812] stdio: Libio vtable protection is sometimes only partially
125 [27054] libc: pthread_atfork handlers that call pthread_atfork
127 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
129 [28128] build: declare_symbol_alias doesn't work for assembly codes
130 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
131 [28752] nss: Segfault in getpwuid when stat fails
132 [28815] libc: realpath should not copy to resolved buffer on error
133 [28828] stdio: fputwc crashes
134 [28838] libc: FAIL: elf/tst-p_align3
135 [28845] locale: ld-monetary.c should be updated to match ISO C and
137 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
139 [28852] libc: getaddrinfo leaks memory with AI_ALL
140 [28853] libc: tst-spawn6 changes current foreground process group
141 (breaks test isolation)
142 [28857] libc: FAIL: elf/tst-audit24a
143 [28860] build: --enable-kernel=5.1.0 build fails because of missing
144 __convert_scm_timestamps
145 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
146 inaccurate without /sys and /proc
147 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
149 [28880] libc: Program crashes if date beyone 2038
150 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
151 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
152 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
153 rtm variants when avoiding overflow
154 [28922] build: The .d dependency files aren't always generated
155 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
157 [28936] build: nm: No such file
158 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
159 [28953] nss: NSS lookup result can be incorrect if function lookup
161 [28970] math: benchtest: libmvec benchmark doesn't build with make
163 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
164 /sys/devices/system/cpu/possible
165 [28993] libc: closefrom() iterates until max int if no access to
167 [28996] libc: realpath fails to copy partial result to resolved buffer
169 [29027] math: [ia64] fabs fails with sNAN input
170 [29029] nptl: poll() spuriously returns EINTR during thread
171 cancellation and with cancellation disabled
172 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
173 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
174 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
175 is promoted to global scope
176 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
177 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
178 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
180 [29097] time: fchmodat does not handle 64 bit time_t for
182 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
184 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
185 [29162] string: [PATCH] string.h syntactic error:
186 include/bits/string_fortified.h:110: error: expected ',' or ';'
187 before '__fortified_attr_access'
188 [29165] libc: [Regression] broken argv adjustment
189 [29187] dynamic-link: [regression] broken argv adjustment for nios2
190 [29193] math: sincos produces a different output than sin/cos
191 [29197] string: __strncpy_power9() uses uninitialised register vs18
192 value for filling after \0
193 [29203] libc: daemon is not y2038 aware
194 [29204] libc: getusershell is not 2038 aware
195 [29207] libc: posix_fallocate fallback implementation is not y2038
197 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
198 [29209] libc: isfdtype is not y2038 aware
199 [29210] network: ruserpass is not y2038 aware
200 [29211] libc: __open_catalog is not y2038 aware
201 [29213] libc: gconv_parseconfdir is not y2038 aware
202 [29214] nptl: pthread_setcanceltype fails to set type
203 [29225] network: Mistyped define statement in socket/sys/socket.h in
205 [29274] nptl: __read_chk is not a cancellation point
206 [29279] libc: undefined reference to `mbstowcs_chk' after
207 464d189b9622932a75302290625de84931656ec0
208 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
209 correct for !__ASSUME_TIME64_SYSCALLS
210 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
211 missing on microblaze with largefile
217 * Unicode 14.0.0 Support: Character encoding, character type info, and
218 transliteration tables are all updated to Unicode 14.0.0, using
219 generator scripts contributed by Mike FABIAN (Red Hat).
221 * Bump r_version in the debugger interface to 2 and add a new field,
222 r_next, support multiple namespaces.
224 * Support for the C.UTF-8 locale has been added to glibc. The locale
225 supports full code-point sorting for all valid Unicode code points. A
226 limitation in the framework for fnmatch, regexec, and regcomp requires
227 a compromise to save space and only ASCII-based range expressions are
228 supported for now (see bug 28255). The full size of the locale is
229 only ~400KiB, with 346KiB coming from LC_CTYPE information for
230 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
231 in various downstream distributions. The locale is not built into
232 glibc, and must be installed.
234 * <math.h> functions that round their results to a narrower type, and
235 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
236 18661-3:2015 and draft ISO C2X:
238 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
239 fMxsqrtfN and fMxsqrtfNx functions.
241 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
244 * <math.h> functions for floating-point maximum and minimum,
245 corresponding to new operations in IEEE 754-2019, and corresponding
246 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
247 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
248 fminimum_mag, fminimum_mag_num and corresponding functions for float,
249 long double, _FloatN and _FloatNx.
251 * <math.h> macros for single-precision float constants are added as a
252 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
253 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
256 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
257 predefined as specified in TS 18661-1:2014.
259 * The exp10 functions in <math.h> now have a corresponding type-generic
262 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
264 * printf-family functions now support the %b format for output of
265 integers in binary, as specified in draft ISO C2X, and the %B variant
266 of that format recommended by draft ISO C2X.
268 * A new DSO sorting algorithm has been added in the dynamic linker that uses
269 topological sorting by depth-first search (DFS), solving performance issues
270 of the existing sorting algorithm when encountering particular circular
271 object dependency cases.
273 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
274 the two DSO sorting algorithms. The default setting of '2' uses the
275 new DFS-based algorithm. The setting '1' switches to the old
276 algorithm used in glibc 2.33 and earlier.
278 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
279 to be used by compilers for optimizing usage of 'memcmp' when its
280 return value is only used for its boolean status.
282 * Support for automatically registering threads with the Linux rseq
283 system call has been added. This system call is implemented starting
284 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
285 operations on per-cpu data. It allows user-space to perform updates
286 on per-cpu data without requiring heavy-weight atomic operations.
287 Automatically registering threads allows all libraries, including
288 libc, to make immediate use of the rseq support by using the
289 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
290 variables. The GNU C Library manual has details on integration of
291 Restartable Sequences.
293 * A symbolic link to the dynamic linker is now installed under
294 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
296 * All programs and the testsuite in glibc are now built as position independent
297 executables (PIE) by default on toolchains and architectures that support it.
298 Further, if the toolchain and architecture supports it, even static programs
299 are built as PIE and the resultant glibc can be used to build static PIE
300 executables. A new option --disable-default-pie has been added to disable
301 this behavior and get a non-PIE build. This option replaces
302 --enable-static-pie, which no longer has any effect on the build
305 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
306 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
307 or to use huge pages directly with mmap calls with the MAP_HUGETLB
308 flags). The former can improve performance when Transparent Huge Pages
309 is set to 'madvise' mode while the latter uses the system reserved
312 * The printf family of functions now handles the flagged %#m conversion
313 specifier, printing errno as an error constant (similar to strerrorname_np).
315 * The function _dl_find_object has been added. In-process unwinders
316 can use it to efficiently locate unwinding information for a code
319 * Support for OpenRISC running on Linux has been added. This port requires
320 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
325 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
326 64-bit file offsets (LFS default).
328 * A new configure option, --with-rtld-early-cflags, can be used to
329 specify additional compiler flags for building the early startup code
330 of the dynamic linker. On targets which have CPU compatibility
331 checks, this can help to ensure that proper diagnostics are printed if
332 the dynamic loader runs on an incompatible CPU.
334 * On Linux, the epoll_pwait2 function has been added. It is similar to
335 epoll_wait with the difference the timeout has nanoseconds resolution.
337 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
338 enabling posix_spawn and posix_spawnp to set the controlling terminal in
339 the new process in a race free manner. This function is a GNU extension.
341 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
342 applications compiling with glibc and gcc 12 and later. Level 3 leverages
343 the __builtin_dynamic_object_size function to deliver additional
344 fortification balanced against additional runtime cost (checking non-constant
347 * The audit libraries will avoid unnecessary slowdown if it is not required
348 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
350 Deprecated and removed features, and other changes affecting compatibility:
352 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
353 has been removed since the first PT_LOAD segment is no longer executable
354 due to defaulting to -z separate-code.
356 * The r_version update in the debugger interface makes the glibc binary
357 incompatible with GDB binaries built without the following commits:
359 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
360 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
362 when audit modules or dlmopen are used.
364 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
366 * The --enable-static-pie option is no longer available. The glibc build
367 configuration script now automatically detects static-pie support in the
368 toolchain and architecture and enables it if available.
370 * The catchsegv script and associated libSegFault.so shared object have
371 been removed. There are widely-deployed out-of-process alternatives for
372 catching coredumps and backtraces.
374 * Support for prelink will be removed in the next release; this includes
375 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
376 variables and their functionality in the dynamic loader.
378 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
379 functionality to obtain the program mapping address can be achieved by
380 using LD_TRACE_LOADED_OBJECTS to value of 2.
382 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
383 support prelink PIE binaries.
385 Changes to build and runtime requirements:
387 * The audit module interface version LAV_CURRENT is increased to enable
388 proper bind-now support. The loader now advertises via the la_symbind
389 flags that PLT trace is not possible. New audit modules require the
390 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
391 modules are still loaded for all targets except aarch64.
393 * The audit interface on aarch64 is extended to support both the indirect
394 result location register (x8) and NEON Q register. Old audit modules are
395 rejected by the loader. Audit modules must be rebuilt to use the newer
396 structure sizes and the latest module interface version for LAV_CURRENT.
398 Security related changes:
400 CVE-2022-23219: Passing an overlong file name to the clnt_create
401 legacy function could result in a stack-based buffer overflow when
402 using the "unix" protocol. Reported by Martin Sebor.
404 CVE-2022-23218: Passing an overlong file name to the svcunix_create
405 legacy function could result in a stack-based buffer overflow.
407 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
408 function could result in a memory leak and potential access of
409 uninitialized memory. Reported by Qualys.
411 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
412 function may result in an off-by-one buffer underflow and overflow
413 when the current working directory is longer than PATH_MAX and also
414 corresponds to the / directory through an unprivileged mount
415 namespace. Reported by Qualys.
417 The following bugs are resolved with this release:
419 [12889] nptl: Race condition in pthread_kill
420 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
421 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
422 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
424 [15333] libc: Use 64-bit stat functions in installed programs
425 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
427 [15971] dynamic-link: No interface for debugger access to libraries
429 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
430 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
431 deeply nested DSO dependencies.
432 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
433 ID whose lifetime has not ended
434 [22542] network: buffer overflow in sunrpc clnt_create
436 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
438 [25947] malloc: memory leak in muntrace
439 [26045] math: fmaxf(inf, nan) does not always work
440 [26108] math: exp10() has problems with <tgmath.h>
441 [26779] build: benign use after realloc at localealias.c:329
442 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
443 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
444 [27945] build: build-many-glibcs.py doesn't configure GCC with
445 --enable-initfini-array
446 [27991] build: x86: sysdeps/x86/configure.ac breaks when
447 libc_cv_include_x86_isa_level is loaded from cache
448 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
449 in __REDIRECT_NTH macro
450 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
451 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
453 [28126] libc: nftw aborts for paths longer than PATH_MAX
454 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
455 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
457 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
458 [28185] math: Inaccurate j0f function (again)
459 [28199] locale: iconvconfig prefix flag behaves differently in glibc
461 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
462 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
464 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
465 [28223] libc: mips: clone does not align stack
466 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
468 [28256] malloc: Conditional jump or move depends on uninitialised
469 value(s) in __GI___tunables_init
470 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
471 spawn5 fail if stray fds are open
472 [28310] libc: Do not use affinity mask for sysconf
473 (_SC_NPROCESSORS_CONF)
474 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
476 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
478 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
479 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
481 [28353] network: Race condition on __opensock
482 [28357] dynamic-link: deadlock between pthread_create and ctors
483 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
484 [28361] nptl: Fix for bug 12889 causes setxid deadlock
485 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
486 [28390] localedata: Update locale data to Unicode 14.0.0
487 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
489 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
491 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
492 to tgkill (getpid (), gettid())
493 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
494 [28457] dynamic-link: Missing reldepmod4.so dependency for
496 [28469] time: linux: struct timex is not correctly set for 32-bit
497 systems with TIMESIZE=64
498 [28470] regex: Buffer read overrun in regular expression searching
499 [28475] string: Incorrect access attribute on memfrob
500 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
501 spurious NUL character on state reset
502 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
504 [28550] dynamic-link: FAIL: tst-dso-
505 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
507 [28554] build: Undefined generate-md5
508 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
510 [28607] nptl: Masked signals are delivered on thread exit
511 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
512 lack of cpu counting /proc fallback with glibc 2.34
513 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
514 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
515 [28648] dynamic-link: Running ld.so on statically linked binaries
517 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
519 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
520 [28678] nptl: nptl/tst-create1 hangs sporadically
521 [28688] dynamic-link: PT_LOAD p_align check is too strict
522 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
524 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
525 timezones generated by tzcode-2021d and later
526 [28713] math: GCC 12 miscompiles libm
527 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
528 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
529 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
530 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
531 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
532 Assertion `GL(dl_rtld_map).l_libname' failed!
533 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
534 [28757] nptl: GDB printer tests failed with new GDB
535 [28765] math: x86_64 libmvec atan2 accuracy
536 [28766] manual: Document libmvec accuracy
537 [28768] network: Buffer overflow in svcunix_create with long pathnames
539 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
541 [28770] libc: Unexpected return value from realpath() for too long
542 results (CVE-2021-3998)
543 [28771] libc: %ebx optimization macros are incompatible with .altmacro
545 [28780] build: --disable-default-pie doesn't work on static programs
546 [28782] libc: x86-64 ISA level for glibc itself is always
548 [28792] glob: possible wrong behaviour with patterns with double [
550 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
551 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
552 empty mon_decimal_point_wc
559 * In order to support smoother in-place-upgrades and to simplify
560 the implementation of the runtime all functionality formerly
561 implemented in the libraries libpthread, libdl, libutil, libanl has
562 been integrated into libc. New applications do not need to link with
563 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
564 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
565 provided, so that the linker options keep working. Applications which
566 have been linked against glibc 2.33 or earlier continue to load the
567 corresponding shared objects (which are now empty). The integration
568 of those libraries into libc means that additional symbols become
569 available by default. This can cause applications that contain weak
570 references to take unexpected code paths that would only have been
571 used in previous glibc versions when e.g. preloading libpthread.so.0,
572 potentially exposing application bugs.
574 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
575 PTHREAD_STACK_MIN is no longer constant and is redefined to
576 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
577 sets for modern architectural features like Arm SVE.
579 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
580 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
581 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
582 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
583 dynamic sized register sets for modern architectural features like
586 * The dynamic linker implements the --list-diagnostics option, printing
587 a dump of information related to IFUNC resolver operation and
588 glibc-hwcaps subdirectory selection.
590 * On Linux, the function execveat has been added. It operates similar to
591 execve and it is is already used to implement fexecve without requiring
592 /proc to be mounted. However, different than fexecve, if the syscall is not
593 supported by the kernel an error is returned instead of trying a fallback.
595 * The ISO C2X function timespec_getres has been added.
597 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
598 C2X, is supported to enable declarations of functions defined in Annex F
599 of C2X. Those declarations are also enabled when
600 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
601 defined, and when _GNU_SOURCE is defined.
603 * On powerpc64*, glibc can now be compiled without scv support using the
604 --disable-scv configure option.
606 * Add support for 64-bit time_t on configurations like x86 where time_t
607 is traditionally 32-bit. Although time_t still defaults to 32-bit on
608 these configurations, this default may change in future versions.
609 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
610 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
611 only enabled for Linux and the full support requires a minimum kernel
614 * The main gconv-modules file in glibc now contains only a small set of
615 essential converter modules and the rest have been moved into a supplementary
616 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
617 in the same GCONV_PATH. Similarly, external converter modules directories
618 may have supplementary configuration files in a gconv-modules.d directory
619 with names ending with .conf to logically classify the converter modules in
622 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
623 to configure the size of the thread stack cache.
625 * The function _Fork has been added as an async-signal-safe fork replacement
626 since Austin Group issue 62 droped the async-signal-safe requirement for
627 fork (and it will be included in the future POSIX standard). The new _Fork
628 function does not run any atfork function neither resets any internal state
629 or lock (such as the malloc one), and only sets up a minimal state required
630 to call async-signal-safe functions (such as raise or execve). This function
631 is currently a GNU extension.
633 * On Linux, the close_range function has been added. It allows efficiently
634 closing a range of file descriptors on recent kernels (version 5.9).
636 * The function closefrom has been added. It closes all file descriptors
637 greater than or equal to a given integer. This function is a GNU extension,
638 although it is also present in other systems.
640 * The posix_spawn_file_actions_addclosefrom_np function has been added,
641 enabling posix_spawn and posix_spawnp to close all file descriptors greater
642 than or equal to a given integer. This function is a GNU extension,
643 although Solaris also provides a similar function.
645 * When invoked explicitly, the dynamic linker now uses the kernel to
646 execute programs that do not have any dynamic dependency (that is,
647 they are statically linked). This feature is Linux-specific.
649 Deprecated and removed features, and other changes affecting compatibility:
651 * The function pthread_mutex_consistent_np has been deprecated; programs
652 should use the equivalent standard function pthread_mutex_consistent
655 * The function pthread_mutexattr_getrobust_np has been deprecated;
656 programs should use the equivalent standard function
657 pthread_mutexattr_getrobust instead.
659 * The function pthread_mutexattr_setrobust_np has been deprecated;
660 programs should use the equivalent standard function
661 pthread_mutexattr_setrobust instead.
663 * The function pthread_yield has been deprecated; programs should use
664 the equivalent standard function sched_yield instead.
666 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
668 * Various rarely-used functions declared in <resolv.h> and
669 <arpa/nameser.h> have been deprecated. Applications are encouraged to
670 use dedicated DNS processing libraries if applicable. For <resolv.h>,
671 this affects the functions dn_count_labels, fp_nquery, fp_query,
672 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
673 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
674 p_type, putlong, putshort, res_hostalias, res_isourserver,
675 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
676 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
677 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
678 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
680 * Various symbols previously defined in libresolv have been moved to libc
681 in order to prepare for libresolv moving entirely into libc (see earlier
682 entry for merging libraries into libc). The symbols __dn_comp,
683 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
684 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
685 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
686 __res_search, __res_send formerly in libresolv have been renamed and no
687 longer have a __ prefix. They are now available in libc.
689 * The pthread cancellation handler is now installed with SA_RESTART and
690 pthread_cancel will always send the internal SIGCANCEL on a cancellation
691 request. It should not be visible to applications since the cancellation
692 handler should either act upon cancellation (if asynchronous cancellation
693 is enabled) or ignore the cancellation internal signal. However there are
694 buggy kernel interfaces (for instance some CIFS versions) that could still
695 see a spurious EINTR error when cancellation interrupts a blocking syscall.
697 * Previously, glibc installed its various shared objects under versioned
698 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
699 were provided as symbolic links. Starting with glibc 2.34, the shared
700 objects are installed under their ABI sonames directly, without
701 symbolic links. This increases compatibility with distribution
702 package managers that delete removed files late during the package
703 upgrade or downgrade process.
705 * The symbols mallwatch and tr_break are now deprecated and no longer used in
706 mtrace. Similar functionality can be achieved by using conditional
707 breakpoints within mtrace functions from within gdb.
709 * The __morecore and __after_morecore_hook malloc hooks and the default
710 implementation __default_morecore have been removed from the API. Existing
711 applications will continue to link against these symbols but the interfaces
712 no longer have any effect on malloc.
714 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
715 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
716 disabled by default in the main C library. Users looking to use these
717 features now need to preload a new debugging DSO libc_malloc_debug.so to get
718 this functionality back.
720 * The deprecated functions malloc_get_state and malloc_set_state have been
721 moved from the core C library into libc_malloc_debug.so. Legacy applications
722 that still use these functions will now need to preload libc_malloc_debug.so
723 in their environment using the LD_PRELOAD environment variable.
725 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
726 __memalign_hook and __free_hook are now removed from the API. Compatibility
727 symbols are present to support legacy programs but new applications can no
728 longer link to these symbols. These hooks no longer have any effect on glibc
729 functionality. The malloc debugging DSO libc_malloc_debug.so currently
730 supports hooks and can be preloaded to get this functionality back for older
731 programs. However this is a transitional measure and may be removed in a
732 future release of the GNU C Library. Users may port away from these hooks by
733 writing and preloading their own malloc interposition library.
735 Changes to build and runtime requirements:
737 * On Linux, the shm_open, sem_open, and related functions now expect the
738 file shared memory file system to be mounted at /dev/shm. These functions
739 no longer search among the system's mount points for a suitable
740 replacement if /dev/shm is not available.
742 Security related changes:
744 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
745 a request for netgroup lookup, may crash due to a double-free,
746 potentially resulting in degraded service or Denial of Service on the
747 local system. Reported by Chris Schanzle.
749 CVE-2021-33574: The mq_notify function has a potential use-after-free
750 issue when using a notification type of SIGEV_THREAD and a thread
751 attribute with a non-default affinity mask.
753 CVE-2021-35942: The wordexp function may overflow the positional
754 parameter number when processing the expansion resulting in a crash.
755 Reported by Philippe Antoine.
757 The following bugs are resolved with this release:
759 [4737] libc: fork is not async-signal-safe
760 [5781] math: Slow dbl-64 sin/cos/sincos for special values
761 [10353] libc: Methods for deleting all file descriptors greater than
762 given integer (closefrom)
763 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
764 name containing multi-byte character(s)
765 [14469] math: Inaccurate j0f function
766 [14470] math: Inaccurate j1f function
767 [14471] math: Inaccurate y0f function
768 [14472] math: Inaccurate y1f function
769 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
771 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
772 crashes if it fails dlsym() twice
773 [15648] nptl: multiple definition of `__lll_lock_wait_private'
774 [16063] nptl: Provide a pthread_once variant in libc directly
775 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
776 [17145] libc: syslog with LOG_CONS leaks console file descriptor
777 [17183] manual: description of ENTRY struct in <search.h> in glibc
779 [18435] nptl: pthread_once hangs when init routine throws an exception
780 [18524] nptl: Missing calloc error checking in
781 __cxa_thread_atexit_impl
782 [19329] dynamic-link: dl-tls.c assert failure at concurrent
783 pthread_create and dlopen
784 [19366] nptl: returning from a thread should disable cancellation
785 [19511] nptl: 8MB memory leak in pthread_create in case of failure
786 when non-root user changes priority
787 [20802] dynamic-link: getauxval NULL pointer dereference after static
789 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
790 [22057] malloc: malloc_usable_size is broken with mcheck
791 [22668] locale: LC_COLLATE: the last character of ellipsis is not
793 [23323] libc: [RFE] CSU startup hardening.
794 [23328] malloc: Remove malloc hooks and ensure related APIs return no
796 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
797 $PLATFORM, $ORIGIN) crashes
798 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
799 [23554] nptl: pthread_getattr_np reports wrong stack size with
801 [24106] libc: Bash interpreter in ldd script is taken from host
802 [24773] dynamic-link: dlerror in an secondary namespace does not use
803 the right free implementation
804 [25036] localedata: Update collation order for Swedish
805 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
806 shm_open to pick wrong directory
807 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
808 crash in IFUNC resolver due to stack canary (--enable-stack-
810 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
811 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
812 [27111] dynamic-link: pthread_create and tls access use link_map
813 objects that may be concurrently freed by dlclose
814 [27132] malloc: memusagestat is linked to system librt, leading to
815 undefined symbols on major version upgrade
816 [27136] dynamic-link: dtv setup at thread creation may leave an entry
818 [27249] libc: libSegFault.so does not output signal number properly
819 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
821 [27318] dynamic-link: glibc fails to load binaries when built with
822 -march=sandybridge: CPU ISA level is lower than required
823 [27343] nss: initgroups() SIGSEGVs when called on a system without
824 nsswich.conf (in a chroot)
825 [27346] dynamic-link: x86: PTWRITE feature check is missing
826 [27389] network: NSS chroot hardening causes regressions in chroot
828 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
829 [27444] libc: sysconf reports unsupported option (-1) for
830 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
831 [27462] nscd: double-free in nscd (CVE-2021-27645)
832 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
833 malloc/tst-malloc-thread-fail
834 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
835 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
837 [27522] glob: glob, glob64 incorrectly marked as __THROW
838 [27555] dynamic-link: Static tests fail with --enable-stack-
840 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
841 information for the current directory
842 [27577] dynamic-link: elf/ld.so --help doesn't work
843 [27605] libc: tunables can't control xsave/xsavec selection in
845 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
846 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
848 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
849 _nss_files_getcanonname_r) from within a dlmopen namespace.
850 [27648] libc: FAIL: misc/tst-select
851 [27650] stdio: vfscanf returns too early if a match is longer than
853 [27651] libc: Performance regression after updating to 2.33
854 [27655] string: Wrong size calculation in string/test-strnlen.c
855 [27706] libc: select fails to update timeout on error
856 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
857 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
858 tries resolving them lazily
859 [27744] nptl: Support different libpthread/ld.so load orders in
861 [27749] libc: Data race __run_exit_handlers
862 [27761] libc: getconf: Segmentation fault when passing '-vq' as
864 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
865 exceeds maximum object size 2147483647
866 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
868 [27872] build: Obsolete configure option --enable-stackguard-
870 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
871 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
872 [27892] libc: powerpc: scv ABI error handling fails to check
874 [27896] nptl: mq_notify does not handle separately allocated thread
875 attributes (CVE-2021-33574)
876 [27901] libc: TEST_STACK_ALIGN doesn't work
877 [27902] libc: The x86-64 clone wrapper fails to align child stack
878 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
879 [27939] libc: aarch64: clone does not align the stack
880 [27968] libc: s390x: clone does not align the stack
881 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
882 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
884 [28028] malloc: malloc: tcache shutdown sequence does not work if the
885 thread never allocated anything
886 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
887 [28064] string: x86_64:wcslen implementation list has wcsnlen
888 [28067] libc: FAIL: posix/tst-spawn5
889 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
890 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
892 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
893 [28089] build: tst-tls20 fails when linker defaults to --as-needed
894 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
896 [28091] network: ns_name_skip may return 0 for domain names without
904 * The dynamic linker accepts the --list-tunables argument which prints
905 all the supported tunables. This option is disable if glibc is
906 configured with tunables disabled (--enable-tunables=no).
908 * The dynamic linker accepts the --argv0 argument and provides opportunity
909 to change argv[0] string.
911 * The dynamic linker loads optimized implementations of shared objects
912 from subdirectories under the glibc-hwcaps directory on the library
913 search path if the system's capabilities meet the requirements for
914 that subdirectory. Initially supported subdirectories include
915 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
916 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
917 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
918 subdirectory names correspond to the vendor-independent x86-64
919 microarchitecture levels defined in the x86-64 psABI supplement.
921 * The new --help option of the dynamic linker provides usage and
922 information and library search path diagnostics.
924 * The mallinfo2 function is added to report statistics as per mallinfo,
925 but with larger field widths to accurately report values that are
926 larger than fit in an integer.
928 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
930 * Support for the RISC-V ISA running on Linux has been expanded to run on
931 32-bit hardware. This is supported for the following ISA and ABI pairs:
937 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
940 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
941 glibc may use additional checks that may have an additional performance
942 overhead. At present these checks are available only on LLVM 9 and later.
943 The latest GCC available at this time (10.2) does not support this level of
946 Deprecated and removed features, and other changes affecting compatibility:
948 * The mallinfo function is marked deprecated. Callers should call
951 * When dlopen is used in statically linked programs, alternative library
952 implementations from HWCAP subdirectories are no longer loaded.
953 Instead, the default implementation is used.
955 * The deprecated <sys/vtimes.h> header and the function vtimes have been
956 removed. To support old binaries, the vtimes function continues to exist
957 as a compatibility symbol. Applications should use the getrlimit or
960 * Following a change in the tzdata 2018a release upstream, the zdump
961 program is now installed in the /usr/bin subdirectory. Previously,
962 the /usr/sbin subdirectory was used.
964 * On s390(x), the type float_t is now derived from the macro
965 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
966 hardcoded to double. This does not affect the ABI of any libraries
967 that are part of the GNU C Library, but may affect the ABI of other
968 libraries that use this type in their interfaces. The new definition
969 improves consistency with compiler behavior in many scenarios.
971 * A future version of glibc will stop loading shared objects from the
972 "tls" subdirectories on the library search path, the subdirectory that
973 corresponds to the AT_PLATFORM system name, and also stop employing
974 the legacy AT_HWCAP search mechanism. Applications should switch to
975 the new glibc-hwcaps mechanism instead; if they do not do that, only
976 the baseline version (directly from the search path directory) will be
979 Changes to build and runtime requirements:
981 * On Linux, the system administrator needs to configure /dev/pts with
982 the intended access modes for pseudo-terminals. glibc no longer
983 attemps to adjust permissions of terminal devices. The previous glibc
984 defaults ("tty" group, user read/write and group write) already
985 corresponded to what most systems used, so that grantpt did not
986 perform any adjustments.
988 * On Linux, the posix_openpt and getpt functions no longer attempt to
989 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
990 (and pseudo-terminals are supported), a devpts file system is mounted
991 on /dev/pts. Current systems already meet these requirements.
993 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
995 Security related changes:
997 CVE-2021-3326: An assertion failure during conversion from the
998 ISO-20220-JP-3 character set using the iconv function has been fixed.
999 This assertion was triggered by certain valid inputs in which the
1000 converted output contains a combined sequence of two wide characters
1001 crossing a buffer boundary. Reported by Tavis Ormandy.
1003 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1004 invoked with input containing redundant shift sequences in the IBM1364,
1005 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1007 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1008 when invoked with UCS4 input containing an invalid character.
1010 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1011 invoked with EUC-KR input containing invalid multibyte input sequences.
1013 The following bugs are resolved with this release:
1015 [10635] libc: realpath portability patches
1016 [16124] dynamic-link: ld.so should allow to change argv[0]
1017 [17924] malloc: 'free' should not set errno
1018 [18683] libc: Linux faccessat implementation can incorrectly ignore
1020 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1021 [23091] hurd: missing waitid support
1022 [23249] libc: Epyc and other current AMD CPUs do not select the
1023 "haswell" platform subdirectory
1024 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1026 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1028 [24941] libc: Make grantpt usable after multi-threaded fork in more
1030 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1031 [24973] locale: iconv encounters segmentation fault when converting
1032 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1033 [25399] string: undefined reference to `__warn_memset_zero_len' when
1034 changing gnuc version
1035 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1037 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1039 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1040 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1041 [26100] libc: Race in syslog(3) with regards to tag printing.
1042 [26124] libc: Export <cpu-features.h>
1043 [26130] nscd: Inconsistent nscd cache during pruning
1044 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1045 [26224] locale: iconv hangs when converting some invalid inputs from
1046 several IBM character sets (CVE-2020-27618)
1047 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1048 too much stack space
1049 [26343] manual: invalid documented return type for strerrorname_np(),
1050 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1051 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1053 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1055 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1056 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1058 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1059 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1060 [26555] string: strerrorname_np does not return the documented value
1061 [26592] libc: pointer arithmetic overflows in realpath
1062 [26600] network: Transaction ID collisions cause slow DNS lookups in
1064 [26606] libc: [2.33 Regression] pselect is broken on x32
1065 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1066 [26620] glob: fnmatch with collating symbols results in segmentation
1068 [26625] libc: [2.33 Regression] CET is disabled
1069 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1070 at the end of a memory mapping
1071 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1072 by the caller to the kernel
1073 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1074 [26647] build: [-Werror=array-parameter=] due to different
1075 declarations for __sigsetjmp
1076 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1078 [26649] stdio: printf should handle non-normal x86 long double numbers
1079 gracefully (CVE-2020-29573)
1080 [26686] build: -Warray-parameter instances building with GCC 11
1081 [26687] build: -Warray-bounds instances building with GCC 11
1082 [26690] stdio: Aliasing violation in __vfscanf_internal
1083 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1084 [26726] build: GCC warning calling new_composite_name with an array of
1086 [26736] libc: FAIL: misc/tst-sysvshm-linux
1087 [26737] libc: Random FAIL: rt/tst-shm
1088 [26791] libc: Missing O_CLOEXEC in sysconf.c
1089 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1091 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1093 [26818] string: aarch64: string tests may run ifunc variants that are
1095 [26821] libc: Memory leak test failures on Fedora 33
1096 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1097 FSGSBASE/LM/RDRAND check failure
1098 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1100 [26853] libc: aarch64: Missing unwind information in statically linked
1102 [26923] locale: Assertion failure in iconv when converting invalid
1103 UCS4 (CVE-2020-29562)
1104 [26926] dynamic-link: aarch64: library dependencies are not bti
1106 [26932] libc: sh: Multiple floating point functions defined as stubs
1108 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1110 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1112 [27002] build: libc_freeres_fn build failure with GCC 11
1113 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1114 [27008] dynamic-link: ld.so.cache should have endianness markup
1115 [27042] libc: [alpha] anonymous union in struct stat confuses
1117 [27053] libc: Conformance regression in system(3) (and probably also
1119 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1121 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1122 [27083] libc: Unsafe unbounded alloca in addmntent
1123 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1125 [27130] string: "rep movsb" performance issue
1126 [27150] libc: alpha: wait4() is unavailable in static linking
1127 [27177] dynamic-link:
1128 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1130 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1131 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1132 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1133 related to combining characters (CVE-2021-3326)
1140 * Unicode 13.0.0 Support: Character encoding, character type info, and
1141 transliteration tables are all updated to Unicode 13.0.0, using
1142 generator scripts contributed by Mike FABIAN (Red Hat).
1144 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1146 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1147 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1148 Three ABIs are supported:
1154 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1155 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1157 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1158 DT_DEPAUDIT dynamic section entries of the main executable.
1160 * powerpc64le supports IEEE128 long double libm/libc redirects when
1161 using -mabi=ieeelongdouble to compile C code on supported GCC
1162 toolchains. It is recommended to use GCC 8 or newer when testing
1165 * To help detect buffer overflows and other out-of-bounds accesses
1166 several APIs have been annotated with GCC 'access' attribute. This
1167 should help GCC 10 issue better warnings.
1169 * On Linux, functions pthread_attr_setsigmask_np and
1170 pthread_attr_getsigmask_np have been added. They allow applications
1171 to specify the signal mask of a thread created with pthread_create.
1173 * The GNU C Library now provides the header file <sys/single_threaded.h>
1174 which declares the variable __libc_single_threaded. Applications are
1175 encouraged to use this variable for single-thread optimizations,
1176 instead of weak references to symbols historically defined in
1179 * The functions sigabbrev_np and sigdescr_np have been added. The
1180 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1181 SIGHUP) while sigdescr_np returns a string describing the signal number
1182 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1183 attempt to translate the return description, both functions return
1184 NULL for an invalid signal number.
1186 They should be used instead of sys_siglist or sys_sigabbrev and they
1187 are both thread and async-signal safe. These functions are GNU extensions.
1189 * The functions strerrorname_np and strerrordesc_np have been added. The
1190 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1191 while strerrordesc_np returns a string describing the error number
1192 (e.g "Invalid argument" for EINVAL). Different than strerror,
1193 strerrordesc_np does not attempt to translate the return description, both
1194 functions return NULL for an invalid error number.
1196 They should be used instead of sys_errlist and sys_nerr, both are
1197 thread and async-signal safe. These functions are GNU extensions.
1199 * AArch64 now supports standard branch protection security hardening
1200 in glibc when it is built with a GCC that is configured with
1201 --enable-standard-branch-protection (or if -mbranch-protection=standard
1202 flag is passed when building both GCC target libraries and glibc,
1203 in either case a custom GCC is needed). This includes branch target
1204 identification (BTI) and pointer authentication for return addresses
1205 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1206 extensions respectively for the protection to be effective,
1207 otherwise the used instructions are nops. User code can use PAC-RET
1208 without libc support, but BTI requires a libc that is built with BTI
1209 support, otherwise runtime objects linked into user code will not be
1212 Deprecated and removed features, and other changes affecting compatibility:
1214 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1215 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1216 RPC header files. Backward compatibility for old programs is kept
1217 only for architectures and ABIs that have been added in or before
1218 glibc 2.31. New programs need to use TI-RPC
1219 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1220 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1222 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1223 as shared library for backward compatibility and the NSS modules "nis"
1224 and "nisplus" are not built at all and libnsl's headers aren't
1225 installed. This compatibility is kept only for architectures and ABIs
1226 that have been added in or before version 2.28. Replacement
1227 implementations based on TI-RPC, which additionally support IPv6, are
1228 available from <https://github.com/thkukuk/>. This change does not
1229 affect the "compat" NSS module, which does not depend on libnsl
1230 since 2.27 and thus can be used without NIS.
1232 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1233 removed. To support old binaries, the sysctl function continues to
1234 exist as a compatibility symbol (on those architectures which had it),
1235 but always fails with ENOSYS. This reflects the removal of the system
1236 call from all architectures, starting with Linux 5.5.
1238 * The sstk function is no longer available to newly linked binaries.
1239 Its implementation always returned with a failure, and the function
1240 was not declared in any header file.
1242 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1243 sigrelse, sigignore and sigset, and the sigmask macro have been
1244 deprecated. Applications should use the sigsuspend, sigprocmask and
1245 sigaction functions instead.
1247 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1248 already supported this format for almost 20 years.
1250 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1251 are no longer available to newly linked binaries, and their declarations
1252 have been removed from <string.h>. They are exported solely as
1253 compatibility symbols to support old binaries. All programs should use
1256 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1257 are no longer available to newly linked binaries, and their declarations
1258 have been removed from <stdio.h>. They are exported solely as
1259 compatibility symbols to support old binaries. All programs should use
1260 strerror or strerror_r instead.
1262 * Both strerror and strerror_l now share the same internal buffer in the
1263 calling thread, meaning that the returned string pointer may be invalided
1264 or contents might be overwritten on subsequent calls in the same thread or
1265 if the thread is terminated. It makes strerror MT-safe.
1267 * Using weak references to libpthread functions such as pthread_create
1268 or pthread_key_create to detect the singled-threaded nature of a
1269 program is an obsolescent feature. Future versions of glibc will
1270 define pthread_create within libc.so.6 itself, so such checks will
1271 always flag the program as multi-threaded. Applications should check
1272 the __libc_single_threaded variable declared in
1273 <sys/single_threaded.h> instead.
1275 * The "files" NSS module no longer supports the "key" database (used for
1276 secure RPC). The contents of the /etc/publickey file will be ignored,
1277 regardless of the settings in /etc/nsswitch.conf. (This method of
1278 storing RPC keys only supported the obsolete and insecure AUTH_DES
1279 flavor of secure RPC.)
1281 * The __morecore and __after_morecore_hook malloc hooks and the default
1282 implementation __default_morecore have been deprecated. Applications
1283 should use malloc interposition to change malloc behavior, and mmap to
1284 allocate anonymous memory. A future version of glibc may require that
1285 applications which use the malloc hooks must preload a special shared
1286 object, to enable the hooks.
1288 * The hesiod NSS module has been deprecated and will be removed in a
1289 future version of glibc. System administrators are encouraged to
1290 switch to other approaches for networked account databases, such as
1293 Changes to build and runtime requirements:
1295 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1296 long double redirects.
1298 Security related changes:
1300 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1301 invoked with the -c option and when processing invalid multi-byte input
1302 sequences. Reported by Jan Engelhardt.
1304 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1305 corruption when they were passed a pseudo-zero argument. Reported by Guido
1306 Vranken / ForAllSecure Mayhem.
1308 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1309 expanding ~user has been fixed.
1311 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1312 memmove functions has been fixed. Discovered by Jason Royes and Samual
1313 Dytrych of the Cisco Security Assessment and Penetration Team (See
1316 The following bugs are resolved with this release:
1318 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1319 [10441] manual: Backtraces code example lacks error checking
1320 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1321 timer_sigev_thread dangerous
1322 [14231] stdio: stdio-common tests memory requirements
1323 [14578] libc: /proc-based emulation for lchmod, fchmodat
1324 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1325 filtee has constructor
1326 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1327 sequences (CVE-2016-10228)
1328 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1329 character entities for infinity & pi
1330 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1331 segfaults in applications
1332 [20543] libc: Please move from .gnu.linkonce to comdat
1333 [22489] network: gcc warns about implicit convertion in
1334 ICMP6_FILTER_SETPASS with -Wsign-conversion
1335 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1336 [23294] math: Complex _FloatN functions are redirected to the wrong
1337 function with -mlong-double-64
1338 [23296] libc: Data race in setting function descriptor during lazy
1340 [23668] dynamic-link: ldconfig: Default to the new format for
1342 [23819] hurd: hurd: Add C11 thread support
1343 [23990] build: test-container error out on failure to exec child.
1344 [23991] build: shell-container typo in run_command_array
1345 [24638] manual: Error in example of parsing a template string
1346 [24654] manual: Wrong declaration of wcschr in libc manual
1347 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1349 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1350 dynamically loaded dsos
1351 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1352 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1354 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1355 restore EAX, ECX and EDX
1356 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1357 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1358 [25420] network: Race condition in resolv_conf.c can result in caching
1359 stale configuration forever
1360 [25487] math: sinl() stack corruption from crafted input
1362 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1364 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1365 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1367 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1368 on 32 bit and old kernel
1369 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1370 [25639] localedata: Some names of days and months wrongly spelt in
1372 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1373 amount of sigset_t bytes
1374 [25691] stdio: printf: memory leak when printing long multibyte
1376 [25715] libc: system() returns wrong errors when posix_spawn fails
1377 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1378 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1379 state for conversions that produce two Unicode code points
1380 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1381 for linux x86_64 leads to livelock
1382 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1383 test failures, invalid instruction in ld.so
1384 [25790] glob: Typo in tst-fnmatch.input
1385 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1387 [25819] localedata: Update locale data to Unicode 13.0.0
1388 [25824] libc: Abnormal function of strnlen in aarch64
1389 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1390 [25896] libc: Incorrect prctl
1391 [25902] libc: Bad LOADARGS_N
1392 [25905] dynamic-link: VSX registers are corrupted during PLT
1393 resolution when glibc is built with --disable-multi-arch and --with-
1395 [25933] string: Off by one error in __strncmp_avx2 when
1396 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1398 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1399 exiting detached thread
1400 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1402 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1404 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1405 [26073] math: getpayload() has wrong return value
1406 [26076] dynamic-link: dlmopen crashes after failing to load
1407 dependencies in audit mode
1408 [26120] localedata: column width of of some Korean
1409 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1410 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1411 [26133] libc: Incorrect need_arch_feature_F16C
1412 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1414 [26149] libc: PKU is usable only if OSPKE is set
1415 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1417 [26208] libc: Incorrect bit_cpu_CLFSH
1418 [26210] network: Incorrect use of hidden symbols for global sunrpc
1420 [26211] stdio: printf integer overflow calculating allocation size
1421 [26214] stdio: printf_fp double free
1422 [26215] stdio: printf_fp memory leak
1423 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1424 [26258] nss: nss_compat should not read input files with mmap
1425 [26332] string: Incorrect cache line size load causes memory
1426 corruption in memset
1433 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1434 enable features from the draft ISO C2X standard. Only some features from
1435 this draft standard are supported by the GNU C Library, and as the draft
1436 is under active development, the set of features enabled by this macro is
1437 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1438 by compiling with "gcc -std=gnu2x".
1440 * The <math.h> functions that round their results to a narrower type now
1441 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1442 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1443 Clarification Request 13 to TS 18661-3.
1445 * The function pthread_clockjoin_np has been added, enabling join with a
1446 terminated thread with a specific clock. It allows waiting against
1447 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1449 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1451 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1452 in queries if the trust-ad option is set via the options directive in
1453 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1454 mode, the AD bit, as provided by the name server, is available to
1455 applications which call res_search and related functions. In the default
1456 mode, the AD bit is not set in queries, and it is automatically cleared in
1457 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1458 servers and the network path to them are treated as untrusted.)
1460 Deprecated and removed features, and other changes affecting compatibility:
1462 * The totalorder and totalordermag functions, and the corresponding
1463 functions for other floating-point types, now take pointer arguments to
1464 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1465 passing. This is in accordance with the resolution of Clarification
1466 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1467 floating-point arguments directly will continue to work.
1469 * The obsolete function stime is no longer available to newly linked
1470 binaries, and its declaration has been removed from <time.h>.
1471 Programs that set the system time should use clock_settime instead.
1473 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1474 in a future version of glibc. In this release, the header still exists
1475 but calling ftime will cause a compiler warning. All programs should use
1476 gettimeofday or clock_gettime instead.
1478 * The gettimeofday function no longer reports information about a
1479 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1480 many years, as it cannot handle the full complexity of the world's
1481 timezones, but hitherto we have supported it on a best-effort basis.
1482 Changes required to support 64-bit time_t on 32-bit architectures have
1483 made this no longer practical.
1485 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1486 should expect to receive a 'struct timezone' whose tz_minuteswest and
1487 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1488 happen on a few Linux-based ports. This will be corrected in a future
1491 All callers should supply a null pointer for the 'tzp' argument to
1492 gettimeofday. For accurate information about the time zone associated
1493 with the current time, use the localtime function.
1495 gettimeofday itself is obsolescent according to POSIX. We have no plans
1496 to remove access to this function, but portable programs should consider
1497 using clock_gettime instead.
1499 * The settimeofday function can still be used to set a system-wide time
1500 zone when the operating system supports it. This is because the Linux
1501 kernel reused the API, on some architectures, to describe a system-wide
1502 time-zone-like offset between the software clock maintained by the kernel,
1503 and the "RTC" clock that keeps time when the system is shut down.
1505 However, to reduce the odds of this offset being set by accident,
1506 settimeofday can no longer be used to set the time and the offset
1507 simultaneously. If both of its two arguments are non-null, the call
1508 will fail (setting errno to EINVAL).
1510 Callers attempting to set this offset should also be prepared for the call
1511 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1512 some Linux architectures. The Linux kernel maintainers are discussing a
1513 more principled replacement for the reused API. After a replacement
1514 becomes available, we will change settimeofday to fail with ENOSYS on all
1515 platforms when its 'tzp' argument is not a null pointer.
1517 settimeofday itself is obsolescent according to POSIX. Programs that set
1518 the system time should use clock_settime and/or the adjtime family of
1519 functions instead. We may cease to make settimeofday available to newly
1520 linked binaries after there is a replacement for Linux's time-zone-like
1523 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1524 the optional CAS instruction is implemented (for instance, LEON processors
1525 are still supported, but SuperSPARC processors are not).
1527 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1530 * If a lazy binding failure happens during dlopen, during the execution of
1531 an ELF constructor, the process is now terminated. Previously, the
1532 dynamic loader would return NULL from dlopen, with the lazy binding error
1533 captured in a dlerror message. In general, this is unsafe because
1534 resetting the stack in an arbitrary function call is not possible.
1536 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1537 executable stack unless explicitly configured at build time to require
1538 minimum kernel version 4.8 or newer. This is because executing
1539 floating-point branches on a non-executable stack on Linux kernels prior to
1540 4.8 can lead to application crashes for some MIPS configurations. While
1541 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1542 expected to enable non-executable stack by default with PT_GNU_STACK by
1543 default and is thus likely to trigger a crash on older kernels.
1545 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1546 non-executable stack while dropping support for older kernels.
1548 * System call wrappers for time system calls now use the new time64 system
1549 calls when available. On 32-bit targets, these wrappers attempt to call
1550 the new system calls first and fall back to the older 32-bit time system
1551 calls if they are not present. This may cause issues in environments
1552 that cannot handle unsupported system calls gracefully by returning
1553 -ENOSYS. Seccomp sandboxes are affected by this issue.
1555 Changes to build and runtime requirements:
1557 * It is no longer necessary to have recent Linux kernel headers to build
1558 working (non-stub) system call wrappers on all architectures except 64-bit
1559 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1561 * The ChangeLog file is no longer present in the toplevel directory of the
1562 source tree. ChangeLog files are located in the ChangeLog.old directory as
1563 ChangeLog.N where the highest N has the latest entries.
1565 Security related changes:
1567 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1568 out-of-bounds write when executed in a signal frame context.
1570 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1571 environment variable during program execution after a security
1572 transition, allowing local attackers to restrict the possible mapping
1573 addresses for loaded libraries and thus bypass ASLR for a setuid
1574 program. Reported by Marcin Kościelnicki.
1576 The following bugs are resolved with this release:
1578 [12031] localedata: iconv -t ascii//translit with Greek characters
1579 [15813] libc: Multiple issues in __gen_tempname
1580 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1581 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1582 [19767] libc: vdso is not used with static linking
1583 [19903] hurd: Shared mappings not being inherited by children processes
1584 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1585 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1587 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1588 Symbols-A/B Unicode blocks
1589 [23518] libc: Eliminate __libc_utmp_jump_table
1590 [24026] malloc: malloc_info() returns wrong numbers
1591 [24054] localedata: Many locales are missing date_fmt
1592 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1593 [24304] dynamic-link: Lazy binding failure during ELF
1594 constructors/destructors is not fatal
1595 [24376] libc: RISC-V symbol size confusion with _start
1596 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1598 [24824] libc: test-in-container does not install charmap files compatible
1600 [24844] regex: regex bad pointer / leakage if malloc fails
1601 [24867] malloc: Unintended malloc_info formatting changes
1602 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1603 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1604 [24882] libc: login: pututline uses potentially outdated cache
1605 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1606 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1608 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1610 [24930] dynamic-link: dlopen of PIE executable can result in
1611 _dl_allocate_tls_init assertion failure
1612 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1613 (stringop-overflow error)
1614 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1615 functions other can lead to crashes
1616 [24967] libc: jemalloc static linking causes runtime failure
1617 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1619 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1620 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1621 [25097] libc: new -Warray-bounds with GCC 10
1622 [25112] dynamic-link: dlopen must not make new objects accessible when it
1623 still can fail with an error
1624 [25139] localedata: Please add the new mnw_MM locale
1625 [25149] regex: Array bounds violation in proceed_next_node
1626 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1627 initialized correctly
1628 [25189] libc: glibc's __glibc_has_include causes issues with clang
1630 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1631 value to an unsigned
1632 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1633 binaries (CVE-2019-19126)
1634 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1636 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1638 [25232] string: <string.h> does not enable const correctness for strchr et
1640 [25233] localedata: Consider "." as the thousands separator for sl_SI
1642 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1643 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1644 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1646 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1647 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1649 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1650 (dl_initfirst) link map pointer
1651 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1652 [25423] libc: Array overflow in backtrace on powerpc
1653 [25425] network: Missing call to __resolv_context_put in
1654 getaddrinfo.c:gethosts
1661 * Unicode 12.1.0 Support: Character encoding, character type info, and
1662 transliteration tables are all updated to Unicode 12.1.0, using
1663 generator scripts contributed by Mike FABIAN (Red Hat).
1665 * The dynamic linker accepts the --preload argument to preload shared
1666 objects, in addition to the LD_PRELOAD environment variable.
1668 * The twalk_r function has been added. It is similar to the existing
1669 twalk function, but it passes an additional caller-supplied argument
1670 to the callback function.
1672 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1674 * Minguo (Republic of China) calendar support has been added as an
1675 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1678 * The entry for the new Japanese era has been added for ja_JP locale.
1680 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1681 pvalloc, memalign, and posix_memalign fail now with total object size
1682 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1683 pointer subtraction within the allocated object, where results might
1684 overflow the ptrdiff_t type.
1686 * The dynamic linker no longer refuses to load objects which reference
1687 versioned symbols whose implementation has moved to a different soname
1688 since the object has been linked. The old error message, symbol
1689 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1690 link time reference, is gone.
1692 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1693 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1694 functions. These behave similarly to their "timed" equivalents, but also
1695 accept a clockid_t parameter to determine which clock their timeout should
1696 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1697 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1698 time of the wait (unlike with pthread_condattr_setclock, which requires
1699 the clock choice at initialization time).
1701 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1702 work, new resolvers can use a second argument which can be extended in
1703 the future, currently it contains the AT_HWCAP2 value.
1705 Deprecated and removed features, and other changes affecting compatibility:
1707 * The copy_file_range function fails with ENOSYS if the kernel does not
1708 support the system call of the same name. Previously, user space
1709 emulation was performed, but its behavior did not match the kernel
1710 behavior, which was deemed too confusing. Applications which use the
1711 copy_file_range function can no longer rely on glibc to provide a fallback
1712 on kernels that do not support the copy_file_range system call, and if
1713 this function returns ENOSYS, they will need to use their own fallback.
1714 Support for copy_file_range for most architectures was added in version
1715 4.5 of the mainline Linux kernel.
1717 * The functions clock_gettime, clock_getres, clock_settime,
1718 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1719 for new applications (on architectures which had them). Instead, the
1720 definitions in libc will be used automatically, which have been available
1723 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1724 and <sys/stropts.h> have been removed.
1726 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1727 resolver flag (deprecated in glibc 2.25) have been removed.
1729 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1730 resolver have been removed from <resolv.h>.
1732 * With --enable-bind-now, installed programs are now linked with the
1735 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1736 configurations) has been removed, following the deprecation of this
1737 subarchitecture in version 8 of GCC, and its removal in version 9.
1739 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1740 header have been removed.
1742 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1743 deprecated and will be removed from a future version of glibc.
1744 Application should directly access /proc instead. For obtaining random
1745 bits, the getentropy function can be used.
1747 Changes to build and runtime requirements:
1749 * GCC 6.2 or later is required to build the GNU C Library.
1751 Older GCC versions and non-GNU compilers are still supported when
1752 compiling programs that use the GNU C Library.
1754 Security related changes:
1756 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1757 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1758 has undefined behavior. On x32, the size_t argument may be passed
1759 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1760 32 bits. When it happened with the sign bit of RDX register set,
1761 memcmp gave the wrong result since it treated the size argument as
1762 zero. Reported by H.J. Lu.
1764 CVE-2019-9169: Attempted case-insensitive regular-expression match
1765 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1766 over-read. Reported by Hongxu Chen.
1768 The following bugs are resolved with this release:
1770 [2872] locale: Transliteration Cyrillic -> ASCII fails
1771 [6399] libc: gettid() should have a wrapper
1772 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1773 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1774 [17396] localedata: globbing for locale by [[.collating-element.]]
1775 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1776 [18465] malloc: memusagestat is built using system C library
1777 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1778 invalid input drops valid char
1779 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1780 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1781 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1782 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1783 [23352] malloc: __malloc_check_init still defined in public header
1785 [23403] nptl: Wrong alignment of TLS variables
1786 [23501] libc: nftw() doesn't return dangling symlink's inode
1787 [23733] malloc: Check the count before calling tcache_get()
1788 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1790 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1791 [23844] nptl: pthread_rwlock_trywrlock results in hang
1792 [23983] argparse: Missing compat versions of argp_failure and argp_error
1793 for long double = double
1794 [23984] libc: Missing compat versions of err.h and error.h functions for
1795 long double = double
1796 [23996] localedata: Dutch salutations
1797 [24040] libc: riscv64: unterminated call chain in __thread_start
1798 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1800 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1801 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1803 [24114] regex: regexec buffer read overrun in "grep -i
1804 '\(\(\)*.\)*\(\)\(\)\1'"
1805 [24122] libc: Segfaults if 0 returned from la_version
1806 [24153] stdio: Some input functions do not react to stdin assignment
1807 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1808 RDX is set) (CVE-2019-7309)
1809 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1810 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1811 not the default "nor"
1812 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1813 false positives, change to modern flexible array
1814 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1815 instructions while maintaining the robust mutex list due to missing
1817 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1818 unnecessary librt dependencies
1819 [24200] localedata: Revert first_weekday removal in en_IE locale
1820 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1821 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1822 [24216] malloc: Check for large bin list corruption when inserting
1824 [24228] stdio: old x86 applications that use legacy libio crash on exit
1825 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1827 [24293] localedata: Missing Minguo calendar support for TW locales
1828 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1829 tt_RU (Tatar) locale
1830 [24307] localedata: Update locale data to Unicode 12.0.0
1831 [24323] dynamic-link: dlopen should not be able open PIE objects
1832 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1833 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1834 tt_RU (Tatar) locale
1835 [24370] localedata: Add lang_name for tt_RU locale
1836 [24372] locale: Binary locale files are not architecture independent
1837 [24394] time: strptime %Ey mis-parses final year of era
1838 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1840 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1842 [24531] malloc: Malloc tunables give tcache assertion failures
1843 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1845 [24535] localedata: Update locale data to Unicode 12.1.0
1846 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1847 kernels and break testing
1848 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1849 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1850 [-Werror=format-overflow=]
1851 [24570] libc: alpha: compat msgctl uses __IPC_64
1852 [24584] locale: Data race in __wcsmbs_clone_conv
1853 [24588] stdio: Remove codecvt vtables from libio
1854 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1856 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1857 [24632] stdio: Old binaries which use freopen with default stdio handles
1859 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1861 [24652] localedata: szl_PL spelling correction
1862 [24695] nss: nss_db: calling getpwent after endpwent crashes
1863 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1864 in /etc/nsswitch.conf
1865 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1866 [24740] libc: getdents64 type confusion
1867 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1868 always implemented in the same library
1869 [24744] libc: Remove copy_file_range emulation
1870 [24757] malloc: memusagestat is linked against system libpthread
1871 [24794] libc: Partial test suite run builds corrupt test-in-container
1879 * The getcpu wrapper function has been added, which returns the currently
1880 used CPU and NUMA node. This function is Linux-specific.
1882 * A new convenience target has been added for distribution maintainers
1883 to build and install all locales as directories with files. The new
1884 target is run by issuing the following command in your build tree:
1885 'make localedata/install-locale-files', with an optional DESTDIR
1886 to set the install root if you wish to install into a non-default
1887 configured location.
1889 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1891 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1892 for _GNU_SOURCE, to match BSD environments.
1894 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1895 indicates that it will abort the transaction prior to entering the kernel
1896 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1897 suspended, and this caused some undefined side-effects issues by aborting
1898 transactions manually. Glibc avoided it by abort transactions manually on
1899 each syscall, but it lead to performance issues on newer kernels where the
1900 HTM state is saved and restore lazily (the state being saved even when the
1901 process actually does not use HTM).
1903 * The functions posix_spawn_file_actions_addchdir_np and
1904 posix_spawn_file_actions_addfchdir_np have been added, enabling
1905 posix_spawn and posix_spawnp to run the new process in a different
1906 directory. These functions are GNU extensions. The function
1907 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1910 * The popen and system do not run atfork handlers anymore (BZ#17490).
1911 Although it is a possible POSIX violation, the POSIX rationale in
1912 pthread_atfork documentation regarding atfork handlers is to handle
1913 inconsistent mutex state after a fork call in a multi-threaded process.
1914 In both popen and system there is no direct access to user-defined mutexes.
1916 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1917 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1919 - C-SKY ABIV2 soft-float little-endian
1920 - C-SKY ABIV2 hard-float little-endian
1922 * strftime's default formatting of a locale's alternative year (%Ey)
1923 has been changed to zero-pad the year to a minimum of two digits,
1924 like "%y". This improves the display of Japanese era years during
1925 the first nine years of a new era, and is expected to be harmless
1926 for all other locales (only Japanese locales regularly have
1927 alternative year numbers less than 10). Zero-padding can be
1928 overridden with the '_' or '-' flags (which are GNU extensions).
1930 * As a GNU extension, the '_' and '-' flags can now be applied to
1931 "%EY" to control how the year number is formatted; they have the
1932 same effect that they would on "%Ey".
1934 Deprecated and removed features, and other changes affecting compatibility:
1936 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1937 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1939 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1940 in <sys/procfs.h>, has been corrected to match the type actually used by
1941 the Linux kernel. This affects the size and layout of that structure on
1942 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1944 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1945 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1946 defined in <sys/procfs.h>, has been corrected to match the type actually
1947 used by the Linux kernel. This affects the size and layout of those
1950 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1951 meant to scan a string and allocate space for it with malloc, is now
1952 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1953 defined. This extension conflicts with C99's use of '%a' to scan a
1954 hexadecimal floating-point number, which is now available to programs
1955 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1957 POSIX.1-2008 includes the feature of allocating a buffer for string input
1958 with malloc, using the modifier letter 'm' instead. Programs using
1959 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1960 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1961 C99 '%a' no longer need to avoid _GNU_SOURCE.
1963 GCC's -Wformat warnings can detect most uses of this extension, as long
1964 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1965 __attribute__ ((format (scanf, ...))).
1967 Changes to build and runtime requirements:
1969 * Python 3.4 or later is required to build the GNU C Library.
1971 * On most architectures, GCC 5 or later is required to build the GNU C
1972 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1974 Older GCC versions and non-GNU compilers are still supported when
1975 compiling programs that use the GNU C Library.
1977 Security related changes:
1979 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1980 denial of service due to resource exhaustion when processing getaddrinfo
1981 calls with crafted host names. Reported by Guido Vranken.
1983 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1984 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1985 happened, accessing the 32-bit size_t value as the full 64-bit register
1986 in the assembly string/memory functions would cause a buffer overflow.
1987 Reported by H.J. Lu.
1989 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1990 addresses with arbitrary trailing characters, potentially leading to data
1991 or command injection issues in applications.
1993 The following bugs are resolved with this release:
1995 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1996 [10496] localedata: 12h time representation in multiple locales faulty
1997 [10797] localedata: it_IT locale numeric does not have a separator for
1999 [11319] libc: dprintf doesn't handle errors properly
2000 [16346] time: mktime: potentially unsafe use of localtime_offset
2001 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2003 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2004 posix_spawn_file_actions_addfchdir_np
2005 [17426] localedata: Indian locales: set the correct date format
2006 [17490] stdio: popen should not invoke atfork handlers
2007 [17783] libc: TIOCSER_TEMT conditions inconsistent
2008 [18040] regex: use-after-free in regexec/get_subexp
2009 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2010 [20018] network: getaddrinfo should reject IP addresses with trailing
2011 characters (CVE-2016-10739)
2012 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2013 [20271] libc: Missing "\n" in __libc_fatal calls
2014 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2015 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2016 pointer argument is non-NULL
2017 [21037] stdio: open_memstream and freopen
2018 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2019 [21716] time: Crash in glibc's mktime in low-memory situations
2020 [22834] stdio: Subprocess forked by popen may crash in Linux when
2021 multithreads call popen
2022 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2023 and pthread_create fails.
2024 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2025 [23125] libc: riscv64: endless loop when throwing an exception from a
2027 [23275] nptl: Race in pthread_mutex_lock while promoting to
2028 PTHREAD_MUTEX_ELISION_NP.
2029 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2031 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2033 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2035 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2036 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2038 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2039 [23521] nss: get_next_alias nss_files file stream leak
2040 [23538] nptl: Hang in pthread_cond_broadcast
2041 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2042 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2043 [23579] libc: Errors misreported in preadv2
2044 [23597] build: support/test-container.c doesn't work with different
2046 [23603] time: mktime signed integer overflow on large timestamps
2047 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2048 [23614] libc: powerpc: missing CFI register information in __mpn_*
2050 [23637] string: Generic strstr/strcasestr fails with huge needles
2051 [23640] libc: no way to easily clear FD_CLOEXEC in
2052 posix_spawn_file_actions_adddup2()
2053 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2055 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2057 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2058 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2059 bits/types/struct_rusage.h
2060 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2062 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2064 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2065 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2066 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2068 [23724] localedata: Albanian date formats are incorrect
2069 [23735] math: libnldbl_nonshared.a references internal libm symbols
2070 [23740] localedata: kl_GL: Month names and date formats need update
2071 [23744] regex: regex refactorings to remove BE, avoid duplication
2072 [23745] time: mktime fix for Gnulib + coreutils
2073 [23758] time: Improve the width of alternate representation for year in
2075 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2076 [23789] time: mktime does not set errno on failure
2077 [23791] localedata: Wrong monetary format for ca_ES locale
2078 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2079 [23794] locale: c16rtomb does not handle surrogate pairs
2080 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2081 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2082 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2083 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2084 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2085 [23862] libc: [sh] missing kernel-features.h undefines
2086 [23864] libc: [riscv] missing kernel-features.h undefines
2087 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2088 [23907] malloc: Incorrect double-free malloc tcache check disregards
2090 [23913] libc: off-by-one in function maybe_script_execute in
2091 sysdeps/posix/spawni.c
2092 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2093 [23923] locale: Add --no-hard-links option to localedef
2094 [23927] network: Linux if_nametoindex() does not close descriptor
2096 [23961] math: powf can overflow to inf without setting errno in non-
2097 nearest rounding mode
2098 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2099 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2100 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2101 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2102 [24011] localedata: Fixed small type in comment for locale bs_BA
2103 [24018] libc: gettext() may return NULL
2104 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2105 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2106 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2108 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2109 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2111 [24046] localedata: en_US locale doesn't define date_fmt
2112 [24063] manual: @var{errno} should be @code{errno}
2113 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2114 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2116 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2118 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2120 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2122 [24112] network: Do not send DNS queries for non-host names (where all
2123 answers will be rejected)
2124 [24130] libc: alpha __remqu corrupts $f3 register
2131 * The localization data for ISO 14651 is updated to match the 2016
2132 Edition 4 release of the standard, this matches data provided by
2133 Unicode 9.0.0. This update introduces significant improvements to the
2134 collation of Unicode characters. This release deviates slightly from
2135 the standard in that the collation element ordering for lowercase and
2136 uppercase LATIN script characters is adjusted to ensure that regular
2137 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2138 is not matched by [a-z]. With the update many locales have been
2139 updated to take advantage of the new collation information. The new
2140 collation information has increased the size of the compiled locale
2141 archive or binary locales.
2143 * The GNU C Library can now be compiled with support for Intel CET, AKA
2144 Intel Control-flow Enforcement Technology. When the library is built
2145 with --enable-cet, the resulting glibc is protected with indirect
2146 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2147 compatible with all existing executables and shared libraries. This
2148 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2149 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2150 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2151 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2152 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2153 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2156 * The GNU C Library now has correct support for ABSOLUTE symbols
2157 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2158 relocated incorrectly or in some cases discarded. The GNU linker can
2159 make use of the newer semantics, but it must communicate it to the
2160 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2161 field) to indicate such support is required.
2163 * Unicode 11.0.0 Support: Character encoding, character type info, and
2164 transliteration tables are all updated to Unicode 11.0.0, using
2165 generator scripts contributed by Mike FABIAN (Red Hat).
2167 * <math.h> functions that round their results to a narrower type are added
2168 from TS 18661-1:2014 and TS 18661-3:2015:
2170 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2171 fMxaddfNx functions.
2173 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2174 fMxsubfNx functions.
2176 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2177 fMxmulfNx functions.
2179 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2180 fMxdivfNx functions.
2182 * Two grammatical forms of month names are now supported for the following
2183 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2184 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2185 support two grammatical forms in abbreviated month names: Catalan, Greek,
2188 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2189 include the support for two grammatical forms of month names.
2191 * Building and running on GNU/Hurd systems now works without out-of-tree
2194 * The renameat2 function has been added, a variant of the renameat function
2195 which has a flags argument. If the flags are zero, the renameat2 function
2196 acts like renameat. If the flag is not zero and there is no kernel
2197 support for renameat2, the function will fail with an errno value of
2198 EINVAL. This is different from the existing gnulib function renameatu,
2199 which performs a plain rename operation in case of a RENAME_NOREPLACE
2200 flags and a non-existing destination (and therefore has a race condition
2201 that can clobber the destination inadvertently).
2203 * The statx function has been added, a variant of the fstatat64
2204 function with an additional flags argument. If there is no direct
2205 kernel support for statx, glibc provides basic stat support based on
2206 the fstatat64 function.
2208 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2209 library if installed. libidn2 version 2.0.5 or later is recommended. If
2210 libidn2 is not available, internationalized domain names are not encoded
2211 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2212 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2213 with an encoding error.) Flags which used to change the IDN encoding and
2214 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2215 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2216 deprecated. They no longer have any effect.
2218 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2219 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2220 range of ELF gABI expressions including such constructs as
2221 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2222 have been further restricted, and where in the past a dynamic string
2223 token sequence may have been interpreted as a literal string it will
2224 now cause a load failure. These load failures were always considered
2225 unspecified behaviour from the perspective of the dynamic loader, and
2226 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2227 results in a load failure now.
2229 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2230 implementation includes all the standard functions provided by
2233 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2234 thrd_detach, thrd_exit, and thrd_join for thread management.
2236 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2237 mtx_destroy for mutual exclusion.
2239 - call_once for function call synchronization.
2241 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2242 cnd_wait for conditional variables.
2244 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2246 Application developers must link against libpthread to use ISO C threads.
2248 Deprecated and removed features, and other changes affecting compatibility:
2250 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2251 installed. Software that was using either header should be updated to
2252 use standard <stdio.h> interfaces instead.
2254 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2255 This was never required by the C standard, and the macros just expanded
2256 to call alternative names for the same functions. If you hoped getc and
2257 putc would provide performance improvements over fgetc and fputc, instead
2258 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2259 necessary, flockfile and funlockfile.
2261 * All stdio functions now treat end-of-file as a sticky condition. If you
2262 read from a file until EOF, and then the file is enlarged by another
2263 process, you must call clearerr or another function with the same effect
2264 (e.g. fseek, rewind) before you can read the additional data. This
2265 corrects a longstanding C99 conformance bug. It is most likely to affect
2266 programs that use stdio to read interactive input from a terminal.
2269 * The macros 'major', 'minor', and 'makedev' are now only available from
2270 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2271 headers that happen to include <sys/types.h>. These macros are rarely
2272 used, not part of POSIX nor XSI, and their names frequently collide with
2273 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2274 further explanation.
2276 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2277 these macros should first include <sys/types.h>, and then include
2278 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2280 * The tilegx*-*-linux-gnu configurations are no longer supported.
2282 * The obsolete function ustat is no longer available to newly linked
2283 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2284 function has been deprecated in favor of fstatfs and statfs.
2286 * The obsolete function nfsservctl is no longer available to newly linked
2287 binaries. This function was specific to systems using the Linux kernel
2288 and could not usefully be used with the GNU C Library on systems with
2289 version 3.1 or later of the Linux kernel.
2291 * The obsolete function name llseek is no longer available to newly linked
2292 binaries. This function was specific to systems using the Linux kernel
2293 and was not declared in a header. Programs should use the lseek64 name
2294 for this function instead.
2296 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2297 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2298 previously selected by them is now always enabled.
2300 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2301 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2302 restriction (rejecting '_' in host names, among other things) has been
2303 removed, for increased compatibility with non-IDN name resolution.
2305 * The fcntl function now have a Long File Support variant named fcntl64. It
2306 is added to fix some Linux Open File Description (OFD) locks usage on non
2307 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2308 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2309 locks act as a cancellation entrypoint.
2311 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2312 ecb_crypt, and des_setparity are no longer available to newly linked
2313 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2314 longer installed. These functions encrypted and decrypted data with the
2315 DES block cipher, which is no longer considered secure. Software that
2316 still uses these functions should switch to a modern cryptography library,
2319 * Reflecting the removal of the encrypt and setkey functions above, the
2320 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2321 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2324 * The obsolete function fcrypt is no longer available to newly linked
2325 binaries. It was just another name for the standard function crypt,
2326 and it has not appeared in any header file in many years.
2328 * We have tentative plans to hand off maintenance of the passphrase-hashing
2329 library, libcrypt, to a separate development project that will, we hope,
2330 keep up better with new passphrase-hashing algorithms. We will continue
2331 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2332 'crypt_r' should not need to change at all; however, distributions will
2333 need to install <crypt.h> and libcrypt from a separate project.
2335 In this release, if the configure option --disable-crypt is used, glibc
2336 will not install <crypt.h> or libcrypt, making room for the separate
2337 project's versions of these files. The plan is to make this the default
2338 behavior in a future release.
2340 Changes to build and runtime requirements:
2342 GNU make 4.0 or later is now required to build glibc.
2344 Security related changes:
2346 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2347 been fixed by removing the glibc-internal IDNA implementation and using
2348 the system-provided libidn2 library instead. Originally reported by Hanno
2349 Böck and Christian Weisgerber.
2351 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2352 architecture could corrupt memory. Reported by Max Horn.
2354 CVE-2018-11236: Very long pathname arguments to realpath function could
2355 result in an integer overflow and buffer overflow. Reported by Alexey
2358 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2359 architecture could write beyond the target buffer, resulting in a buffer
2360 overflow. Reported by Andreas Schwab.
2362 The following bugs are resolved with this release:
2364 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2365 [6889] manual: 'PWD' mentioned but not specified
2366 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2367 when __WORDSIZE != 64
2368 [13762] regex: re_search etc. should return -2 on memory exhaustion
2369 [13888] build: /tmp usage during testing
2370 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2371 [14092] nptl: Support C11 threads
2372 [14095] localedata: Review / update collation data from Unicode / ISO
2374 [14508] libc: -Wformat warnings
2375 [14553] libc: Namespace pollution loff_t in sys/types.h
2376 [14890] libc: Make NT_PRFPREG canonical.
2377 [15105] libc: Extra PLT references with -Os
2378 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2380 [16335] manual: Feature test macro documentation incomplete and out of
2382 [16552] libc: Unify umount implementations in terms of umount2
2383 [17082] libc: htons et al.: statement-expressions prevent use on global
2384 scope with -O1 and higher
2385 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2386 [17438] localedata: pt_BR: wrong d_fmt delimiter
2387 [17662] libc: please implement binding for the new renameat2 syscall
2388 [17721] libc: __restrict defined as /* Ignore */ even in c11
2389 [17979] libc: inconsistency between uchar.h and stdint.h
2390 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2391 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2392 horrible machine code)
2393 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2395 [18471] libc: llseek should be a compat symbol
2396 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2398 [18991] nss: nss_files skips large entry in database
2399 [19239] libc: Including stdlib.h ends up with macros major and minor being
2401 [19463] libc: linknamespace failures when compiled with -Os
2402 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2403 [19527] locale: Normalized charset name not recognized by setlocale
2404 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2405 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2407 [19728] network: out of bounds stack read in libidn function
2408 idna_to_ascii_4i (CVE-2016-6261)
2409 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2410 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2411 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2413 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2414 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2415 [20419] dynamic-link: files with large allocated notes crash in
2417 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2418 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2419 [20980] manual: CFLAGS environment variable replaces vital options
2420 [21163] regex: Assertion failure in pop_fail_stack when executing a
2421 malformed regexp (CVE-2015-8985)
2422 [21234] manual: use of CFLAGS makes glibc detect no optimization
2423 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2424 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2425 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2426 [21508] locale: intl/tst-gettext failure with latest msgfmt
2427 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2428 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2429 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2431 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2433 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2434 [22247] network: Integer overflow in the decode_digit function in
2435 puny_decode.c in libidn (CVE-2017-14062)
2436 [22342] nscd: NSCD not properly caching netgroup
2437 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2438 [22550] localedata: es_ES locale (and other es_* locales): collation
2439 should treat ñ as a primary different character, sync the collation
2440 for Spanish with CLDR
2441 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2442 by gcc configured with --enable-default-pie
2443 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2444 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2445 crossing 2GB threshold (CVE-2017-18269)
2446 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2448 [22735] time: Misleading typo in time.h source comment regarding
2450 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2451 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2452 `__assert_perror_fail ()' to `__assert_fail_base ()'
2453 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2455 [22786] libc: Stack buffer overflow in realpath() if input size is close
2456 to SSIZE_MAX (CVE-2018-11236)
2457 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2458 through an absolute DT_NEEDED path
2459 [22792] build: tcb-offsets.h dependency dropped
2460 [22797] libc: pkey_get() uses non-reserved name of argument
2461 [22807] libc: PTRACE_* constants missing for powerpc
2462 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2463 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2464 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2465 [22848] localedata: ca_ES: update date definitions from CLDR
2466 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2467 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2468 [22896] localedata: Update locale data for an_ES
2469 [22902] math: float128 test failures with GCC 8
2470 [22918] libc: multiple common of `__nss_shadow_database'
2471 [22919] libc: sparc32: backtrace yields infinite backtrace with
2473 [22926] libc: FTBFS on powerpcspe
2474 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2476 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2477 [22947] libc: FAIL: misc/tst-preadvwritev2
2478 [22963] localedata: cs_CZ: Add alternative month names
2479 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2480 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2481 [22998] dynamic-link: execstack tests are disabled when SELinux is
2483 [23005] network: Crash in __res_context_send after memory allocation
2485 [23007] math: strtod cannot handle -nan
2486 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2487 [23036] regex: regex equivalence class regression
2488 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2489 [23069] libc: sigaction broken on riscv64-linux-gnu
2490 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2491 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2492 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2493 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2494 and libc build with -Os)
2495 [23140] localedata: More languages need two forms of month names
2496 [23145] libc: _init/_fini aren't marked as hidden
2497 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2498 [23171] math: C++ iseqsig for long double converts arguments to double
2499 [23178] nscd: sudo will fail when it is run in concurrent with commands
2500 that changes /etc/passwd
2501 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2503 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2504 [23208] localedata: New locale - Lower Sorbian (dsb)
2505 [23233] regex: Memory leak in build_charclass_op function in file
2507 [23236] stdio: Harden function pointers in _IO_str_fields
2508 [23250] nptl: Offset of __private_ss differs from GCC
2509 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2510 -mtune=generic -mfpmath=sse
2511 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2513 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2514 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2516 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2517 [23277] math: nan function should not have const attribute
2518 [23279] math: scanf and strtod wrong for some hex floating-point
2519 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2521 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2522 [23303] build: undefined reference to symbol
2523 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2524 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2526 [23313] stdio: libio vtables validation and standard file object
2528 [23329] libc: The __libc_freeres infrastructure is not properly run across
2530 [23349] libc: Various glibc headers no longer compatible with
2532 [23351] malloc: Remove unused code related to heap dumps and malloc
2534 [23363] stdio: stdio-common/tst-printf.c has non-free license
2535 [23396] regex: Regex equivalence regression in single-byte locales
2536 [23422] localedata: oc_FR: More updates of locale data
2537 [23442] build: New warning with GCC 8
2538 [23448] libc: Out of bounds access in IBM-1390 converter
2539 [23456] libc: Wrong index_cpu_LZCNT
2540 [23458] build: tst-get-cpu-features-static isn't added to tests
2541 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2543 [23467] dynamic-link: x86/CET: A property note parser bug
2550 * The GNU C Library can now be compiled with support for building static
2551 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2552 executables are like static executables but can be loaded at any address
2553 and provide additional security hardening benefits at the cost of some
2554 memory and performance. When the library is built with --enable-static-pie
2555 the resulting libc.a is usable with GCC 8 and above to create static PIE
2556 executables using the GCC option '-static-pie'. This feature is currently
2557 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2558 aarch64 with binutils 2.30 or later.
2560 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2561 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2564 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2566 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2568 * In order to support faster and safer process termination the malloc API
2569 family of functions will no longer print a failure address and stack
2570 backtrace after detecting heap corruption. The goal is to minimize the
2571 amount of work done after corruption is detected and to avoid potential
2572 security issues in continued process execution. Reducing shutdown time
2573 leads to lower overall process restart latency, so there is benefit both
2574 from a security and performance perspective.
2576 * The abort function terminates the process immediately, without flushing
2577 stdio streams. Previous glibc versions used to flush streams, resulting
2578 in deadlocks and further data corruption. This change also affects
2579 process aborts as the result of assertion failures.
2581 * On platforms where long double has the IEEE binary128 format (aarch64,
2582 alpha, mips64, riscv, s390 and sparc), the math library now implements
2583 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2584 These are the same interfaces added in version 2.26 for some platforms where
2585 this format is supported but is not the format of long double.
2587 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2588 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2589 implements interfaces for that type, as defined by ISO/IEC TS
2590 18661-3:2015. These are corresponding interfaces to those supported for
2593 * The math library now implements interfaces for the _Float32, _Float64 and
2594 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2595 corresponding interfaces to those supported for _Float128.
2597 * glibc now implements the memfd_create and mlock2 functions on Linux.
2599 * Support for memory protection keys was added. The <sys/mman.h> header now
2600 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2603 * The copy_file_range function was added.
2605 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2607 * The ldconfig utility now processes `include' directives using the C/POSIX
2608 collation ordering. Previous glibc versions used locale-specific
2609 ordering, the change might break systems that relied on that.
2611 * Support for two grammatical forms of month names has been added.
2612 In a call to strftime, the "%B" and "%b" format specifiers will now
2613 produce the grammatical form required when the month is used as part
2614 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2615 required when the month is named by itself. For instance, in Greek
2616 and in many Slavic and Baltic languages, "%B" will produce the month
2617 in genitive case, and "%OB" will produce the month in nominative case.
2619 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2620 are all valid and will all accept any known form of month
2621 name---standalone or complete, abbreviated or full. In a call to
2622 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2623 the strings used by "%B" and "%b", respectively. New query
2624 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2625 used by "%OB" and "%Ob", respectively.
2627 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2628 define the strings for %OB and %Ob, respectively; these have the
2629 same syntax as "mon" and "abmon". These arrays are optional; if they
2630 are not provided then they have the same content as "mon" and "abmon",
2633 These features are provided for locales which define "alt_mon" and/or
2634 "ab_alt_mon" in their locale source data. This release includes such
2635 alternative month name data for the following languages: Belarusian,
2636 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2638 This feature is currently a GNU extension, but it is expected to
2639 be added to the next revision of POSIX, and it is also already
2640 available on some BSD-derived operating systems.
2642 This feature will cause existing statically compiled applications
2643 to fail to load locales and fall back to the builtin C/POSIX locales.
2644 See notes below for other changes affecting compatibility.
2646 * Support for the RISC-V ISA running on Linux has been added. This port
2647 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2648 for the following ISA and ABI pairs:
2654 Deprecated and removed features, and other changes affecting compatibility:
2656 * Statically compiled applications attempting to load locales compiled for the
2657 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2658 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2659 support for two grammatical forms of the month names, also extends the locale
2660 data binary format. Static applications needing locale support must be
2661 recompiled to match the runtime and data they are deployed with. In some
2662 distributions there is an upgrade window where dynamically linked applications
2663 may use a new library but the old locale data and also fall back to the
2664 builtin C/POSIX locales; restarting the application process is sufficient to
2667 * Support for statically linked applications which call dlopen is deprecated
2668 and will be removed in a future version of glibc. Applications which call
2669 dlopen need to be linked dynamically instead.
2671 * Support for old programs which use internal stdio data structures and
2672 functions is deprecated. This includes programs which use the C++ streams
2673 provided by libstdc++ in GCC 2.95. Programs which use the internal
2674 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2675 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2676 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2677 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2678 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2679 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2680 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2681 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2682 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2683 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2684 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2685 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2686 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2687 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2688 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2689 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2690 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2691 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2692 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2693 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2694 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2695 future version of glibc. Unlike other symbol removals, these old
2696 applications will not be supported using compatibility symbols.
2698 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2699 defined by <sys/ptrace.h>.
2701 * libm no longer supports SVID error handling (calling a user-provided
2702 matherr function on error) or the _LIB_VERSION variable to control error
2703 handling. (SVID error handling and the _LIB_VERSION variable still work
2704 for binaries linked against older versions of the GNU C Library.) The
2705 libieee.a library is no longer provided. math.h no longer defines struct
2706 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2707 TLOSS, PLOSS and HUGE.
2709 * The libm functions pow10, pow10f and pow10l are no longer supported for
2710 new programs. Programs should use the standard names exp10, exp10f and
2711 exp10l for these functions instead.
2713 * The mcontext_t type is no longer the same as struct sigcontext. On
2714 platforms where it was previously the same, this changes the C++ name
2715 mangling for interfaces involving this type.
2717 * The add-ons mechanism for building additional packages at the same time as
2718 glibc has been removed. The --enable-add-ons configure option is now
2721 * The --without-fp configure option is now ignored. Whether hardware
2722 floating-point instructions are used is now configured based on whether
2723 the compiler used at configure time (without any options implied by a
2724 --with-cpu= configure option) uses such instructions.
2726 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2727 the specified string can be parsed as a domain name.
2729 * In the malloc_info output, the <heap> element may contain another <aspace>
2730 element, "subheaps", which contains the number of sub-heaps.
2732 * The libresolv function p_secstodate is no longer supported for new
2735 * The tilepro-*-linux-gnu configuration is no longer supported.
2737 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2738 and will be removed in a future release. Software that is still using
2739 either header should be updated to use standard <stdio.h> interfaces
2742 libio.h was originally the header for a set of supported GNU extensions,
2743 but they have not been maintained as such in many years, they are now
2744 standing in the way of improvements to stdio, and we don't think there are
2745 any remaining external users. _G_config.h was never intended for public
2746 use, but predates the bits convention.
2748 Changes to build and runtime requirements:
2750 * bison version 2.7 or later is required to generate code in the 'intl'
2753 Security related changes:
2755 CVE-2009-5064: The ldd script would sometimes run the program under
2756 examination directly, without preventing code execution through the
2757 dynamic linker. (The glibc project disputes that this is a security
2758 vulnerability; only trusted binaries must be examined using the ldd
2761 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2762 suffered from a one-byte overflow during ~ operator processing (either
2763 on the stack or the heap, depending on the length of the user name).
2764 Reported by Tim Rühsen.
2766 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2767 would sometimes fail to free memory allocated during ~ operator
2768 processing, leading to a memory leak and, potentially, to a denial
2771 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2772 without GLOB_NOESCAPE, could write past the end of a buffer while
2773 unescaping user names. Reported by Tim Rühsen.
2775 CVE-2017-17426: The malloc function, when called with an object size near
2776 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2777 instead of NULL. This was a regression introduced with the new malloc
2778 thread cache in glibc 2.26. Reported by Iain Buclaw.
2780 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2781 to the allocation of too much memory. (This is not a security bug per se,
2782 it is mentioned here only because of the CVE assignment.) Reported by
2785 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2786 of the number of search path components. (This is not a security
2787 vulnerability per se because no trust boundary is crossed if the fix for
2788 CVE-2017-1000366 has been applied, but it is mentioned here only because
2789 of the CVE assignment.) Reported by Qualys.
2791 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2792 for AT_SECURE or SUID binaries could be used to load libraries from the
2795 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2796 succeeds without returning an absolute path due to unexpected behaviour
2797 of the Linux kernel getcwd syscall. Reported by halfdog.
2799 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2800 an object size near the value of SIZE_MAX, would return a pointer to a
2801 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2803 CVE-2018-6551: The malloc function, when called with an object size near
2804 the value of SIZE_MAX, would return a pointer to a buffer which is too
2805 small, instead of NULL.
2807 The following bugs are resolved with this release:
2809 [866] glob: glob should match dangling symlinks
2810 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2811 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2813 [5997] math: Very slow execution of sinf function
2814 [10580] localedata: hr_HR: updated locale
2815 [10871] locale: 'mon' array should contain both nominative and genitive
2817 [12349] localedata: eu_ES: incorrect thousands separator
2818 [13605] localedata: shn_MM: new Shan locale
2819 [13805] localedata: ru_RU: currency should use ',' as radix point
2820 [13953] localedata: km_KH: locale update
2821 [13994] localedata: mjw_IN: new locale
2822 [14121] build: make writes .mo files in po directory
2823 [14333] libc: Fix the race between atexit() and exit()
2824 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2825 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2827 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2828 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2829 width Latin characters
2830 [15332] localedata: es_CU: locale update
2831 [15436] stdio: Don't close or flush stdio streams on abort
2832 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2834 [16148] localedata: ca_ES: incorrect thousands separator
2835 [16750] dynamic-link: ldd should not try to execute the binaries
2837 [16777] localedata: pl_PL: incorrect thousands separator in locale
2838 [16905] localedata: hanzi: new collation
2839 [17563] localedata: cmn_TW: add hanzi collation
2840 [17750] localedata: wrong collation order of diacritics in most locales
2841 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2843 [17956] build: Build fails on missing definitions from header file
2844 nss/nss.h when Mozilla NSS is used for cryptography
2845 [18203] libc: realpath() does not handle unreachable paths correctly
2846 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2847 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2848 [18822] libc: Internal functions are called via PLT
2849 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2850 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2851 [19574] libc: glibc should support building static PIE binaries
2852 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2854 [19971] glob: glob: Do not skip entries with zero d_ino values
2855 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2856 [20008] localedata: km_KH: convert to translit_neutral
2857 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2858 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2859 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2860 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2861 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2863 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2864 they're set, wrong errors returned by gaih_inet when lookup functions
2866 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2867 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2869 [20952] localedata: yuw_PG: new locale
2870 [21084] localedata: charmaps/IBM858: new codepage
2871 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2872 [21242] libc: assert gives pedantic warning in old gcc versions
2873 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2874 __regcall calling convention
2875 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2876 [21326] libc: C99 functions are not declared for C++11 and later if
2877 _GNU_SOURCE is not predefined by g++
2878 [21457] libc: sys/ucontext.h namespace
2879 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2880 [21660] math: GCC fails to compile a formula with tgmath.h
2881 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2882 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2883 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2884 [21684] math: tgmath.h handling of complex integers
2885 [21685] math: tgmath.h handling of bit-fields
2886 [21686] math: tgmath.h handling of __int128
2887 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2889 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2891 [21750] localedata: column width of characters incompatible with classical
2893 [21754] malloc: malloc: Perform as little work as possible after heap
2894 consistency check failures
2895 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2896 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2897 [21791] string: Unused XXX_chk_XXX functions in libc.a
2898 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2900 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2902 [21845] localedata: Added new Locale bho_NP
2903 [21853] localedata: Fix abday Which looks same as day in zh_SG
2904 [21854] localedata: Added New Locale en_SC
2905 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2906 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2907 _dl_runtime_resolve_avx_slow
2908 [21885] network: getaddrinfo: gethosts does not release resolver context
2909 on memory allocation failure
2910 [21899] libc: XPG4.2 sigaction namespace
2911 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2913 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2915 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2916 errno value, causing getaddrinfo to fail
2917 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2918 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2919 instead of EAI_NODATA
2920 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2921 constant PTRACE_SEIZE_DEVEL
2922 [21930] math: C-only gcc builtins used in <math.h> isinf
2923 [21932] network: Unpaired __resolv_context_get in generic get*_r
2925 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2926 [21944] libc: sigval namespace
2927 [21951] localedata: Update hanzi collation by stroke
2928 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2929 sysdeps/x86_64/fpu/e_expf.S
2930 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2931 allocation in syscall loops)
2932 [21959] localedata: Fix Country name for xh_ZA
2933 [21960] localedata: Fix abmon for bem_ZM
2934 [21966] math: AVX2 mathvec functions use FMA without checking
2935 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2936 [21971] localedata: Added New Locale for mfe_MU
2937 [21972] libc: assert macro requires operator== (int) for its argument type
2938 [21973] math: [sparc] libm missing sqrtl compat symbol
2939 [21974] libc: Remove __bb_init_func and __bb_exit_func
2940 [21982] string: stratcliff.c: error: assuming signed overflow does not
2942 [21986] stdio: __guess_grouping is called incorrectly
2943 [21987] math: [sparc32] wrong bits/long-double.h installed
2944 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2946 [22022] localedata: Missing country_name for mni_IN
2947 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2949 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2951 [22026] locale: iconv_open: heap overflow on gconv_init failure
2952 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2953 [22035] math: [m68k] bits/math-inline.h macro namespace
2954 [22038] localedata: Fix abbreviated weeks and months for Somali
2955 [22044] localedata: Remove redundant data for Limburgish Language
2956 [22050] malloc: Linking with -lmcheck does not hook
2957 __malloc_initialize_hook correctly
2958 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2959 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2960 [22070] localedata: charmaps/UTF-8: wcwidth for
2961 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2962 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2963 Jungseong and Jongseong) should be 0
2964 [22078] nss: nss_files performance issue in multi mode
2965 [22082] math: bits/math-finite.h exp10 condition
2966 [22086] libc: pcprofiledump incorrect cross-endian condition
2967 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2968 [22095] network: Name server address allocation memory leak in resolv.conf
2970 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2972 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2973 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2975 [22111] malloc: malloc: per thread cache is not returned when thread exits
2976 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2977 [22134] libc: [linux] implement fexecve with execveat
2978 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2980 [22145] libc: ttyname() gives up too early in the face of namespaces
2981 [22146] math: C++ build issue with float128 on x86_64
2982 [22153] nptl: nptl: save error code before process termination
2983 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2984 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2985 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2986 [22165] libc: [hppa] Text relocations in libc.so
2987 [22180] libc: destructor registered via __cxa_atexit is called twice
2988 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2989 symlinks") cause "make" segfaults
2990 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2992 [22207] libc: FAIL: stdlib/test-atexit-race
2993 [22225] math: nearbyint arithmetic moved before feholdexcept
2994 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2995 [22235] math: iscanonical in C++ and float128
2996 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2997 the svid compat wrapper
2998 [22244] math: ynf and yn are wrong without the svid compat wrapper
2999 [22273] libc: Improper assert in Linux posix_spawn implementation
3000 [22284] libc: -pg -pie doesn't work
3001 [22292] locale: localedef exits with error 4 when it should be error 1
3002 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3003 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3005 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3006 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3008 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3009 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3010 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3011 [22322] libc: [mips64] wrong bits/long-double.h installed
3012 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3013 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3015 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3016 [22343] malloc: Integer overflow in posix_memalign
3017 [22347] libc: getrandom() returns the number of bytes that were copied to
3018 the buffer even though the comments say "Return 0 on success and -1 on
3020 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3021 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3023 [22370] dynamic-link: Incorrect note padding check
3024 [22375] libc: malloc returns pointer from tcache_get when should return
3025 NULL (CVE-2017-17426)
3026 [22377] math: iseqsig, float128 and C++
3027 [22382] localedata: Error in tpi_PG locale
3028 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3029 inside the ASCII printable range
3030 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3032 [22403] localedata: Slash needs escaping in some locales
3033 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3034 [22409] network: res_hnok does not accept some host names used on the
3036 [22412] network: res_dnok, res_hnok should perform syntax checks
3037 [22413] network: ns_name_pton ignores syntactically invalid trailing
3039 [22415] stdio: setvbuf can lead to invalid free/segfault
3040 [22432] build: Non-deterministic build
3041 [22439] malloc: malloc_info should compute summary statistics for all sub-
3043 [22442] network: if_nametoindex could report index for the wrong
3044 networking interface
3045 [22446] build: aliasing violation calling readlink in handle_request
3046 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3047 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3048 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3049 __nscd_hash/__nss_hash
3050 [22463] network: p_secstodate overflow handling
3051 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3052 [22478] libc: sigwait can fail with EINTR
3053 [22505] libc: ldconfig processes include directive in locale-specific
3055 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3056 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3057 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3058 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3059 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3060 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3061 same as for Croatian
3062 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3063 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3064 [22577] libc: missing newline after "cannot allocate TLS data structures
3066 [22588] manual: manual/conf.texi: missing underscore in front of
3068 [22593] math: nextafter and nexttoward are declared with const attribute
3069 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3070 [22603] string: ia64 memchr overflows internal pointer check
3071 [22605] libc: SH clone does not set the exit code correctly
3072 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3074 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3075 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3076 modified in case of success
3077 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3078 [22615] manual: manual: ambiguous wording about errno value in case of
3080 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3082 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3083 binaries or if /proc is not mounted (CVE-2017-16997)
3084 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3085 [22630] build: $(no-pie-ldflag) is no longer effective
3086 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3087 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3088 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3089 [22637] nptl: guard size is subtracted from thread stack size instead of
3091 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3092 [22657] localedata: hu_HU: Avoid double space in date
3093 [22660] math: fmax, fmin sNaN handling on alpha
3094 [22664] libc: New warning of GCC8
3095 [22665] math: alpha: ceil and floor raise inexact exceptions
3096 [22666] math: alpha: trunc raise inexact exceptions
3097 [22667] libc: makecontext lacks stack alignment on i386
3098 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3099 [22679] libc: getcwd(3) can succeed without returning an absolute path
3101 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3102 elision and tunables
3103 [22687] math: [powerpc-nofpu] complex long double functions spurious
3105 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3106 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3107 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3109 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3110 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3112 [22701] nis: Incomplete removal of libnsl
3113 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3114 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3115 [22715] dynamic-link: FAIL: elf/tst-audit10
3116 [22719] libc: Backtrace tests fail on hppa
3117 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3118 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3119 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3120 before the first call to crypt_r () in crypt/badsalttest.c
3127 * A per-thread cache has been added to malloc. Access to the cache requires
3128 no locks and therefore significantly accelerates the fast path to allocate
3129 and free small amounts of memory. Refilling an empty cache requires locking
3130 the underlying arena. Performance measurements show significant gains in a
3131 wide variety of user workloads. Workloads were captured using a special
3132 instrumented malloc and analyzed with a malloc simulator. Contributed by
3133 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3135 * Unicode 10.0.0 Support: Character encoding, character type info, and
3136 transliteration tables are all updated to Unicode 10.0.0, using
3137 generator scripts contributed by Mike FABIAN (Red Hat).
3138 These updates cause user visible changes, especially the changes in
3139 wcwidth for many emoji characters cause problems when emoji sequences
3140 are rendered with pango, see for example:
3141 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3143 * Collation of Hungarian has been overhauled and is now consistent with "The
3144 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3147 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3149 - The GNU C Library will now detect when /etc/resolv.conf has been
3150 modified and reload the changed configuration. The new resolver option
3151 “no-reload” (RES_NORELOAD) disables this behavior.
3153 - The GNU C Library now supports an arbitrary number of search domains
3154 (configured using the “search” directive in /etc/resolv.conf);
3155 previously, there was a hard limit of six domains. For backward
3156 compatibility, applications that directly modify the ‘_res’ global
3157 object are still limited to six search domains.
3159 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3160 Library will now randomly pick a name server from the configuration as a
3161 starting point. (Previously, the second name server was always used.)
3163 * The tunables feature is now enabled by default. This allows users to tweak
3164 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3166 * New function reallocarray, which resizes an allocated block (like realloc)
3167 to the product of two sizes, with a guaranteed clean failure upon integer
3168 overflow in the multiplication. Originally from OpenBSD, contributed by
3169 Dennis Wölfing and Rüdiger Sonderfeld.
3171 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3172 These are extended versions of preadv and pwritev, respectively, taking an
3173 additional flags argument. The set of supported flags depends on the
3174 running kernel; full support currently requires kernel 4.7 or later.
3176 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3177 create a new session ID for the spawned process. This feature is
3178 scheduled to be added to the next major revision of POSIX; for the time
3179 being, it is available under _GNU_SOURCE.
3181 * errno.h is now safe to use from C-preprocessed assembly language on all
3182 supported operating systems. In this context, it will only define the
3183 Exxxx constants, as preprocessor macros expanding to integer literals.
3185 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3186 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3187 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3188 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3190 To compile programs that use this feature, the compiler must support
3191 128-bit floating point with the type name _Float128 (as defined by TS
3192 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3193 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3194 must be defined to make the new interfaces visible.
3196 The new functions and macros correspond to those present for other
3197 floating-point types (except for a few obsolescent interfaces not
3198 supported for the new type), with F128 or f128 suffixes; for example,
3199 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3200 printf or scanf formats for the new type; the strfromf128 and strtof128
3201 interfaces should be used instead.
3203 Deprecated and removed features, and other changes affecting compatibility:
3205 * The synchronization that pthread_spin_unlock performs has been changed to
3206 now be equivalent to a C11 atomic store with release memory order to the
3207 spin lock's memory location. Previously, several (but not all)
3208 architectures used stronger synchronization (e.g., containing what is
3209 often called a full barrier). This change can improve performance, but
3210 may affect odd fringe uses of spin locks that depend on the previous
3211 behavior (e.g., using spin locks as atomic variables to try to implement
3212 Dekker's mutual exclusion algorithm).
3214 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3217 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3218 will only be built and installed when the GNU C Library is configured with
3219 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3220 as TIRPC or rpcsvc-proto, to be used.
3222 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3223 libnss_compat, are deprecated, and will not be built or installed by
3226 The NIS(+) support library, libnsl, is also deprecated. By default, a
3227 compatibility shared library will be built and installed, but not headers
3228 or development libraries. Only a few NIS-related programs require this
3229 library. (In particular, the GNU C Library has never required programs
3230 that use 'gethostbyname' to be linked with libnsl.)
3232 Replacement implementations based on TIRPC, which additionally support
3233 IPv6, are available from <https://github.com/thkukuk/>. The configure
3234 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3235 name service modules, to be built and installed.
3237 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3238 support is enabled, the configured recursive resolver must support EDNS.
3239 (Responding to EDNS-enabled queries with responses which are not
3240 EDNS-enabled is fine, but FORMERR responses are not.)
3242 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3243 servers have not supported this opcode for a long time.
3245 * The _res_opcodes variable has been removed from libresolv. It had been
3246 exported by accident.
3248 * <string.h> no longer includes inline versions of any string functions,
3249 as this kind of optimization is better done by the compiler. The macros
3250 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3252 * The nonstandard header <xlocale.h> has been removed. Most programs should
3253 use <locale.h> instead. If you have a specific need for the definition of
3254 locale_t with no other declarations, please contact
3255 libc-alpha@sourceware.org and explain.
3257 * The obsolete header <sys/ultrasound.h> has been removed.
3259 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3261 * The obsolete function cfree has been removed. Applications should use
3264 * The stack_t type no longer has the name struct sigaltstack. This changes
3265 the C++ name mangling for interfaces involving this type.
3267 * The ucontext_t type no longer has the name struct ucontext. This changes
3268 the C++ name mangling for interfaces involving this type.
3270 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3271 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3272 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3273 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3274 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3275 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3276 fpregset_t type no longer has the name struct fpu. This changes the C++
3277 name mangling for interfaces involving those types.
3279 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3280 synced with the kernel:
3282 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3283 are not supported on this architecture and have been removed.
3285 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3286 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3287 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3289 Programs that assume the GET/SETREGS ptrace requests are universally
3290 available will now fail to build, instead of malfunctioning at runtime.
3292 Changes to build and runtime requirements:
3294 * Linux kernel 3.2 or later is required at runtime, on all architectures
3295 supported by that kernel. (This is a change from version 2.25 only for
3298 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3300 * On most architectures, GCC 4.9 or later is required to build the GNU C
3301 Library. On powerpc64le, GCC 6.2 or later is required.
3303 Older GCC versions and non-GNU compilers are still supported when
3304 compiling programs that use the GNU C Library. (We do not know exactly
3305 how old, and some GNU extensions to C may be _de facto_ required. If you
3306 are interested in helping us make this statement less vague, please
3307 contact libc-alpha@sourceware.org.)
3309 Security related changes:
3311 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3312 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3314 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3315 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3317 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3318 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3321 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3322 fixed (CVE-2017-12133).
3324 The following bugs are resolved with this release:
3326 [984] network: Respond to changed resolv.conf in gethostbyname
3327 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3328 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3330 [12189] libc: __stack_chk_fail should not attempt a backtrace
3332 [14096] time: Race condition on timezone/tst-timezone.out
3333 [14172] localedata: az_IR: new locale
3334 [14995] build: glibc fails to build if gold is the default linker, even if
3336 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3337 [16637] network: inet_pton function is accepting IPv6 with bad format
3338 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3339 x86 and other generic code
3340 [16875] localedata: ko_KR: fix lang_name
3341 [17225] localedata: ar_SY: localized month names for May and June are
3343 [17297] localedata: da_DK: wrong date_fmt string
3344 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3345 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3346 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3347 [19066] localedata: ar_SA abbreviated day and month names are in English
3348 [19569] network: resolv: Support an arbitrary number of search domains
3349 [19570] network: Implement random DNS server selection in the stub
3351 [19838] locale: localedef fails on PA-RISC
3352 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3353 order of 0D36 and 0D37
3354 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3356 [20098] libc: FAIL: debug/backtrace-tst on hppa
3357 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3359 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3361 [20313] localedata: Update locale data to Unicode 9.0
3362 [20424] manual: Document how to provide a malloc replacement
3363 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3365 [20686] locale: Add el_GR@euro to SUPPORTED.
3366 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3367 failures consistently
3368 [21015] dynamic-link: Document and fix --enable-bind-now
3369 [21016] nptl: pthread_cond support is broken on hppa
3370 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3371 frame-pointer on i386
3372 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3374 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3375 [21088] libc: Build fails with --enable-static-nss
3376 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3377 generic c code is used
3378 [21109] libc: Tunables broken on big-endian
3379 [21112] math: powf has large ulp errors with base close to 1 and exponent
3381 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3383 [21120] malloc: glibc malloc is incompatible with GCC 7
3384 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3386 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3387 (-0.0) when linking with -lieee
3388 [21171] math: log10, log2 and lgamma return incorrect results
3389 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3390 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3391 [21207] localedata: ce_RU: update weekdays from CLDR
3392 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3393 [21217] localedata: Update months from CLDR-31
3394 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3395 [21243] libc: support_delete_temp_file should issue warning for failed
3397 [21244] libc: support resolv_test_start() socket fd close should be
3399 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3400 new posix_spawn implementation
3401 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3402 leads to lower CPU frequency
3403 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3404 [21261] libc: [sparc64] bits/setjmp.h namespace
3405 [21267] network: [mips] bits/socket.h IOC* namespace
3406 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3407 [21270] libc: mmap64 silently truncates large offset values
3408 [21275] libc: posix_spawn always crashes on ia64 now
3409 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3410 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3411 [21289] libc: Incorrect declaration for 32-bit platforms with
3412 _FILE_OFFSET_BITS=64 causes build error
3413 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3414 not support gethostbyname4_r
3415 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3417 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3419 [21340] libc: Support POSIX_SPAWN_SETSID
3420 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3421 [21359] network: ns_name_pack needs additional byte in destination buffer
3422 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3423 against fragmentation attacks (CVE-2017-12132)
3424 [21369] network: resolv: Remove EDNS fallback
3425 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3427 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3428 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3429 [21393] stdio: Missing dup3 error check in freopen, freopen64
3430 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3431 [21399] localedata: Bad description for U00EC in
3432 localedata/charmaps/CP1254
3433 [21411] malloc: realloc documentation error
3434 [21426] network: sys/socket.h uio.h namespace
3435 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3436 [21445] libc: signal.h bsd_signal namespace
3437 [21455] network: Network headers stdint.h namespace
3438 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3440 [21475] network: resolv: Overlong search path is truncated mid-label
3441 [21511] libc: sigstack namespace
3442 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3443 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3444 bits/syscall.h: No such file or directory
3445 [21517] libc: struct sigaltstack namespace
3446 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3447 [21533] localedata: Update locale data to Unicode 10.0
3449 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3450 junk at end of line, first unrecognized character is `@'
3451 [21538] libc: SIG_HOLD missing for XPG4
3452 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3453 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3454 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3455 [21543] libc: sigevent namespace
3456 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3457 size for general purpose registers in mcontext_t structure
3458 [21550] libc: sigwait namespace
3459 [21552] libc: XPG4 bsd_signal namespace
3460 [21554] libc: sigpause namespace
3461 [21560] libc: sys/wait.h signal.h namespace
3462 [21561] libc: waitid namespace
3463 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3464 '/usr/include/stdlib.h': Permission denied
3465 [21575] libc: sys/wait.h missing struct rusage definition
3466 [21584] libc: sigaltstack etc namespace
3467 [21597] libc: siginterrupt namespace
3468 [21607] math: hppa: FAIL: math/test-tgmath
3469 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3471 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3472 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3473 stack and heap (CVE-2017-1000366)
3474 [21625] libc: wait3 namespace
3475 [21654] nss: Incorrect pointer alignment in NSS group merge result
3477 [21657] network: Parse interface zone id for node-local multicast
3478 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3480 [21666] libc: .symver is used on common symbol
3481 [21668] network: resolv: res_init cross-thread broadcast introduces race
3483 [21687] math: tgmath.h totalorder, totalordermag return type
3484 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3486 [21696] libc: Incorrect assumption of of __cpu_mask in
3487 posix/sched_cpucount.c
3488 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3489 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3491 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3492 leading to relocation crash
3493 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3494 `resolv_conf_matches (resp, conf)' failed.
3495 [21710] localedata: Added Samoan language locale for Samoa
3496 [21711] localedata: Pashto yesstr/nostr locale are missing
3497 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3498 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3499 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3500 [21723] localedata: yesstr/nostr missing for Chinese language locale
3501 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3503 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3505 [21728] localedata: New Locale for Tongan language
3506 [21729] localedata: incorrect LC_NAME fields for hi_IN
3507 [21733] localedata: yesstr and nostr are missing for zh_HK
3508 [21734] localedata: Missing yesstr and nostr are for kw_GB
3509 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3510 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3511 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3512 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3514 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3516 [21749] localedata: Wrong abbreviated day name (“abday”) for
3518 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3519 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3520 [21759] localedata: missing yesstr and nostr for Tigrinya
3521 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3522 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3523 [21767] localedata: Missing Bislama locales
3524 [21768] localedata: Missing yesstr and nostr for aa_ET
3525 [21770] localedata: Missing Field in li_NL
3526 [21778] nptl: Robust mutex may deadlock
3527 [21779] libc: MicroBlaze segfaults when loading libpthread
3528 [21783] localedata: Fix int_select international_call_prefixes
3529 [21784] localedata: Inconsistency in country_isbn
3530 [21788] localedata: Missing Country Postal Abbreviations
3531 [21794] localedata: Added-country_isbn-for-Italy
3532 [21795] localedata: Add/Fix country_isbn for France
3533 [21796] localedata: Added country_isbn for Republic of Korea
3534 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3535 [21799] localedata: Added int_select international_call_prefixes
3536 [21801] localedata: Added int_select international_call_prefixes
3537 [21804] nptl: Double semicolon in thread-shared-types.h
3538 [21807] localedata: LC_ADDRESS fix for pap_CW
3539 [21808] localedata: Fix LC_ADDRESS for pap_AW
3540 [21821] localedata: Added country_name in mai_IN
3541 [21822] localedata: Fix LC_TIME for mai_IN
3542 [21823] localedata: missing yesstr, nostr for sa_IN
3543 [21825] localedata: Fix name_mrs for mag_IN
3544 [21828] localedata: 2.26 changelog should mention user visible changes
3546 [21835] localedata: Added Maithili language locale for Nepal
3547 [21838] localedata: Removed redundant data for the_NP
3548 [21839] localedata: Fix LC_MONETARY for ta_LK
3549 [21844] localedata: Fix Latin characters and Months Sequence.
3550 [21848] localedata: Fix mai_NP Title Name
3555 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3556 24731-2:2010, is supported to enable declarations of functions from that
3557 TR. Note that not all functions from that TR are supported by the GNU C
3560 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3561 18661-1:2014, is supported to enable declarations of functions and macros
3562 from that TS. Note that not all features from that TS are supported by
3565 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3566 18661-4:2015, is supported to enable declarations of functions and macros
3567 from that TS. Note that most features from that TS are not supported by
3570 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3571 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3572 Since the GNU C Library defaults to a much newer revision of POSIX, this
3573 will only affect programs that specifically request an old conformance
3574 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3575 see a change in the visible declarations, but a program compiled with
3576 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3579 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3580 defined by all multithreaded code, but glibc has not required this for
3583 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3584 means that in a future release, the macros “major”, “minor”, and “makedev”
3585 will only be available from <sys/sysmacros.h>.
3587 These macros are not part of POSIX nor XSI, and their names frequently
3588 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3589 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3590 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3593 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3594 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3595 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3597 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3598 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3599 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3600 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3601 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3602 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3603 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3604 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3605 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3606 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3607 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3610 * New <math.h> features are added from TS 18661-1:2014:
3612 - Signaling NaN macros: SNANF, SNAN, SNANL.
3614 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3615 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3616 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3618 - llogb functions: the llogb, llogbf and llogbl functions, and the
3619 FP_LLOGB0 and FP_LLOGBNAN macros.
3621 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3624 - Comparison macros: iseqsig.
3626 - Classification macros: iscanonical, issubnormal, iszero.
3628 - Total order functions: totalorder, totalorderf, totalorderl,
3629 totalordermag, totalordermagf, totalordermagl.
3631 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3633 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3634 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3636 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3637 are added to libc. They convert a floating-point number into string.
3639 * Most of glibc can now be built with the stack smashing protector enabled.
3640 It is recommended to build glibc with --enable-stack-protector=strong.
3641 Implemented by Nick Alcock (Oracle).
3643 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3644 intended to be used instead of memset() to erase sensitive data after use;
3645 the compiler will not optimize out calls to explicit_bzero even if they
3646 are "unnecessary" (in the sense that no _correct_ program can observe the
3647 effects of the memory clear).
3649 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3650 to float instead of double. This does not affect the ABI of any libraries
3651 that are part of the GNU C Library, but may affect the ABI of other
3652 libraries that use this type in their interfaces.
3654 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3655 float_t and double_t types are now defined to long double instead of float
3656 and double. These options are not the default, and this does not affect
3657 the ABI of any libraries that are part of the GNU C Library, but it may
3658 affect the ABI of other libraries that use this type in their interfaces,
3659 if they are compiled or used with those options.
3661 * The getentropy and getrandom functions, and the <sys/random.h> header file
3664 * The buffer size for byte-oriented stdio streams is now limited to 8192
3665 bytes by default. Previously, on Linux, the default buffer size on most
3666 file systems was 4096 bytes (and thus remains unchanged), except on
3667 network file systems, where the buffer size was unpredictable and could be
3668 as large as several megabytes.
3670 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3671 for the Linux quota interface which predates kernel version 2.4.22 has
3674 * The malloc_get_state and malloc_set_state functions have been removed.
3675 Already-existing binaries that dynamically link to these functions will
3676 get a hidden implementation in which malloc_get_state is a stub. As far
3677 as we know, these functions are used only by GNU Emacs and this change
3678 will not adversely affect already-built Emacs executables. Any undumped
3679 Emacs executables, which normally exist only during an Emacs build, should
3680 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3682 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3683 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3684 “no-ip6-dotint” had already been the default, and support for the
3685 “ip6-dotint” option was removed from the Internet in 2006.
3687 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3688 flag from <resolv.h> have been removed. The option relied on a
3689 backwards-incompatible DNS extension which was never deployed on the
3692 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3693 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3694 They were already unimplemented.
3696 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3697 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3698 removed again from the IETF name lookup interface specification in RFC
3699 2553. Applications should use getaddrinfo instead.
3701 * DNSSEC-related declarations and definitions have been removed from the
3702 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3703 decode the data part of DNSSEC record types. Previous versions of glibc
3704 only implemented minimal support for the previous version of DNSSEC, which
3705 is incompatible with the currently deployed version.
3707 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3708 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3709 <arpa/nameser.h> header file because the distinction between RR types and
3710 meta-RR types is not officially standardized, subject to revision, and
3711 thus not suitable for encoding in a macro.
3713 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3714 and rhook members of the res_state type in <resolv.h> have been removed.
3715 The glibc stub resolver did not support these hooks, but the header file
3716 did not reflect that.
3718 * For multi-arch support it is recommended to use a GCC which has
3719 been built with support for GNU indirect functions. This ensures
3720 that correct debugging information is generated for functions
3721 selected by IFUNC resolvers. This support can either be enabled by
3722 configuring GCC with '--enable-gnu-indirect-function', or by
3723 enabling it by default by setting 'default_gnu_indirect_function'
3724 variable for a particular architecture in the GCC source file
3727 * GDB pretty printers have been added for mutex and condition variable
3728 structures in POSIX Threads. When installed and loaded in gdb these pretty
3729 printers show various pthread variables in human-readable form when read
3730 using the 'print' or 'display' commands in gdb.
3732 * Tunables feature added to allow tweaking of the runtime for an application
3733 program. This feature can be enabled with the '--enable-tunables' configure
3734 flag. The GNU C Library manual has details on usage and README.tunables has
3735 instructions on adding new tunables to the library.
3737 * A new version of condition variables functions have been implemented in
3738 the NPTL implementation of POSIX Threads to provide stronger ordering
3741 * A new version of pthread_rwlock functions have been implemented to use a more
3742 scalable algorithm primarily through not using a critical section anymore to
3745 Security related changes:
3747 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3748 have been created with makecontext could fail to terminate due to a
3749 missing .cantunwind annotation. This has been observed to lead to a hang
3750 (denial of service) in some Go applications compiled with gccgo. Reported
3751 by Andreas Schwab. (CVE-2016-6323)
3753 * The DNS stub resolver functions would crash due to a NULL pointer
3754 dereference when processing a query with a valid DNS question type which
3755 was used internally in the implementation. The stub resolver now uses a
3756 question type which is outside the range of valid question type values.
3759 The following bugs are resolved with this release:
3761 [4099] stdio: Overly aggressive caching by stream i/o functions.
3762 [7065] build: Support building glibc with -fstack-protector or -fstack-
3764 [9842] localedata: en_CA: incorrect date format
3765 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3766 before it started waiting
3767 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3768 [15765] nptl: sem_open is wrongly a cancellation point
3769 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3770 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3772 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3773 library linked with pthread
3774 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3775 "FIXME: Ingo" issue)
3776 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3777 [17252] libc: getrandom and getentropy syscall
3778 [17730] malloc: thread-local storage is sometimes improperly free()'d
3779 after being __libc_memalign()'d
3780 [18241] stdio: failed fseek on memstream does not set errno and can fail
3782 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3784 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3785 PTHREAD_PRIO_INHERIT mutex on ARM
3786 [18784] network: res_query and related function crash for special record
3787 type queries (CVE-2015-5180)
3788 [19380] math: strtod does not raise "inexact"
3789 [19387] string: Integer overflow in memchr
3790 [19390] string: Integer overflow in strncat
3791 [19398] build: linknamespace tests fail with massively parallel build
3792 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3794 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3795 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3796 [19514] libc: [PATCH] Fix spelling errors in spelling
3797 "implement"/"implementation" in several places
3798 [19582] network: Deprecate RES_USE_INET6
3799 [19673] manual: clog10 docs appear to be erroneous
3800 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3801 causes a segmentation fault
3802 [19826] libc: invalid pointer returned from __tls_get_addr with static
3804 [20016] network: resolv: Remove hooks support from the API
3805 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3807 [20033] math: [x86_64] vectorized math function don't call the __finite
3809 [20116] nptl: use after free in pthread_create
3810 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3811 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3813 [20311] nptl: please install proc_service.h
3814 [20366] libc: Compilation errors in installed headers in strict-compliance
3816 [20370] malloc: malloc: Arena free list management is still racy
3817 (incorrect fix in bug 19243)
3818 [20386] libc: assert (X = 0) does not result in GCC warning
3819 [20432] malloc: malloc: Minimize interface required for interposition
3820 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3821 in _Unwind_Backtrace (CVE-2016-6323)
3822 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3823 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3825 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3826 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3827 [20477] network: resolv: incorrect double-checked locking related to
3829 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3831 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3833 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3834 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3835 cause transition penalty
3836 [20517] math: sparcv9 missing fdiml compat symbol
3837 [20524] manual: strverscmp is inconsistent
3838 [20525] libc: <sys/quota.h> should be based on kernel headers
3839 [20539] math: GCC 7 -static -lm fails to link at -O3
3840 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3842 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3844 [20591] network: Remove obsolete DNSSEC support
3845 [20592] network: DNS resource record type classification macros in
3846 <arpa/nameser.h> are incorrect
3847 [20593] network: Update DNS RR type definitions
3848 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3849 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3851 [20629] network: libresolv: Remove support for bitstring labels
3853 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3854 assertion: "maxidx >= 2"
3855 [20660] math: [arm] Use VSQRT
3856 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3857 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3858 [20689] libc: Test for FMA should also check for AVX.
3859 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3860 [20715] math: iszero macro breaks existing code
3861 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3862 [20728] libc: powerpc: Missing TOC stub in clone
3863 [20729] build: glibc-2.24 fails to build for i486 with -Os
3864 [20750] build: Build fails with default PIE enabled gcc-6.x
3865 [20768] math: [alpha] sqrt fegetenv namespace
3866 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3868 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3869 __FLT_EVAL_METHOD__ is 2
3870 [20790] network: rpcgen buffer overrun in get_prog_declaration
3871 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3872 [20829] libc: crypt snprintf namespace
3873 [20847] libc: tst-vfork3 failure
3874 [20855] math: Default bits/mathdef.h has inappropriate float_t
3875 [20859] math: [sh4] FP_ILOGB0 invalid
3876 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3877 U+20AC), not same as GBK
3878 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3879 [20916] math: pow handling of sNaN arguments
3880 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3881 [20919] math: Bad pow (qNaN, 0) result with -lieee
3882 [20940] math: hypot sNaN handling
3883 [20947] math: fmax, fmin sNaN handling
3884 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3885 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3887 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3888 [20973] nptl: robust mutexes: Lost wake-ups
3889 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3890 [20978] nis: strlen on null pointer in nss_nisplus
3891 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3893 [21014] string: i686 memchr overflows internal pointer check
3894 [21019] libc: [mips] n32 lseek incorrect on overflow
3895 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3896 [21026] libc: [MIPS] readahead syscall is broken on n64
3897 [21028] math: Fallback fesetexceptflag should always succeed
3898 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3899 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3901 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3902 [21061] librt: [microblaze] librt lost clock_* exports
3903 [21073] libc: tunables: insecure environment variables passed to
3904 subprocesses with AT_SECURE
3905 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3909 * The minimum Linux kernel version that this version of the GNU C Library
3910 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3911 kernel version 2.6.32 or later suffices (on architectures that already
3912 required kernel versions more recent than 3.2, those requirements remain
3913 unchanged). Linux 3.2 or later kernel headers are required on all
3916 * The pap_AN locale has been deleted. This has been deprecated for a long
3917 time. It has been replaced by pap_AW & pap_CW, both of which have long
3918 been included in previous releases.
3920 * The readdir_r and readdir64_r functions have been deprecated. It is
3921 recommended to use readdir and readdir64 instead.
3923 * The type “union wait” has been removed. It was deprecated in the early
3924 1990s and never part of POSIX. Application code should use the int type
3925 instead of “union wait”.
3927 * A new NSS action is added to facilitate large distributed system
3928 administration. The action, MERGE, allows remote user stores like LDAP
3929 to be merged into local user stores like /etc/groups in order to provide
3930 easy to use, updated, and managed sets of merged credentials. The new
3931 action can be used by configuring it in /etc/nsswitch.conf:
3932 group: files [SUCCESS=merge] nis
3933 Implemented by Stephen Gallagher (Red Hat).
3935 * The deprecated __malloc_initialize_hook variable has been removed from the
3938 * The long unused localedef --old-style option has been removed. It hasn't
3939 done anything in over 16 years. Scripts using this option can safely
3942 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3943 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3944 return the next representable value in the direction of positive infinity
3945 and the nextdown functions return the next representable value in the
3946 direction of negative infinity. These are currently enabled as GNU
3949 Security related changes:
3951 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3952 could result in a stack overflow when getnetbyname was called with an
3953 overly long name. (CVE-2016-3075)
3955 * Previously, getaddrinfo copied large amounts of address data to the stack,
3956 even after the fix for CVE-2013-4458 has been applied, potentially
3957 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3958 instead. Reported by Michael Petlan. (CVE-2016-3706)
3960 * The glob function suffered from a stack-based buffer overflow when it was
3961 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3962 Reported by Alexander Cherepanov. (CVE-2016-1234)
3964 * The Sun RPC UDP client could exhaust all available stack space when
3965 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3966 alloca plugin for GCC. (CVE-2016-4429)
3968 * The IPv6 name server management code in libresolv could result in a memory
3969 leak for each thread which is created, performs a failing naming lookup,
3970 and exits. Over time, this could result in a denial of service due to
3971 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3973 The following bugs are resolved with this release:
3975 [1170] localedata: ne_NP: update Nepali locale definition file
3976 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3978 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3979 [6796] math: fdim() does not set errno on overflow
3980 [10354] libc: posix_spawn should use vfork() in more cases than presently
3981 [11213] localedata: localedata: add copyright disclaimer to locale files
3982 [12143] localedata: chr_US: new Cherokee locale
3983 [12450] localedata: sgs_LT: new locale
3984 [12676] localedata: ln_CD: new locale
3985 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3987 [13304] math: fma, fmaf, fmal produce wrong results
3988 [14259] build: --localedir arg to configure is ignored
3989 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3990 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3991 [14934] localedata: es_CL: wrong first weekday chilean locale
3992 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3994 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3996 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3997 [15368] nptl: raise() is not async-signal-safe
3998 [15479] math: ceil, floor, round and trunc raise inexact exception
3999 [15578] localedata: kk_KZ: various updates
4000 [16003] localedata: pap_AN: punt old locale
4001 [16137] localedata: iw_IL: punt old locale
4002 [16190] localedata: eo: new esperanto locale
4003 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4004 [16742] malloc: race condition: pthread_atfork() called before first
4005 malloc() results in unexpected locking behaviour/deadlocks
4006 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4008 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4009 [17565] localedata: pt_PT: wrong (work-)week start
4010 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4011 [17950] build: Build fails with -msse
4012 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4013 [18433] libc: posix_spawn does not return correctly upon failure to
4015 [18453] localedata: charmaps/IBM875: incorrect codes
4016 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4018 [18896] localedata: he_IL: improvements for currency
4019 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4020 Romanian locale data
4021 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4023 [19056] libc: Deprecate readdir_r
4024 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4026 [19198] localedata: nl_NL: small improvements for Dutch locales
4027 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4028 nameservers (CVE-2016-5417)
4029 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4031 [19400] locale: Language missing in "iso-639.def", trivial fix in
4033 [19431] malloc: Deadlock between fflush, getdelim, and fork
4034 [19505] libc: Incorrect file descriptor validity checks in
4035 posix_spawn_file_actions_add{open,close,dup2}
4036 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4037 when using RTLD_NEXT
4038 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4039 `intl/{gettextP,loadinfo}.h'
4040 [19534] libc: execle, execlp may use malloc
4041 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4042 [19573] network: res_nclose and __res_maybe_init disagree about name
4043 server initialization, breaking Hesiod
4044 [19575] localedata: Status of GB18030 tables
4045 [19581] localedata: sr_* date_fmt string contains additional newline
4046 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4048 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4049 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4050 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4051 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4053 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4055 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4057 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4058 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4059 [19633] locale: strfmon_l applies global locale to number formatting
4060 [19642] network: Memory leak in getnameinfo
4061 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4062 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4064 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4065 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4067 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4068 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4070 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4072 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4074 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4075 pointers and lengths in error-case.
4076 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4077 report errors on UTF-16 surrogates values.
4078 [19755] nscd: nscd assertion failure in gc
4079 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4080 [19759] libc: mempcpy shouldn't be inlined
4081 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4082 [19765] libc: s390 needs an optimized mempcpy
4083 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4084 NAME_MAX limit assumption (CVE-2016-1234)
4085 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4086 [19787] network: Missing and incorrect truncation checks in getnameinfo
4087 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4089 [19791] network: Assertion failure in res_query.c with un-connectable name
4091 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4092 [19822] math: libm.so install clobbers old version
4093 [19825] network: resolv: send_vc can return uninitialized data in second
4094 response to getaddrinfo
4095 [19830] network: nss_dns: should check RDATA length against buffer length
4096 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4097 confronted with A/AAAA records of invalid size
4098 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4099 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4100 [19853] stdio: Printing IBM long double in decimal with high precision is
4102 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4103 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4104 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4106 [19865] network: Assertion failure or memory leak in
4107 _nss_dns_getcanonname_r
4108 [19868] network: nss_dns: netent code does not skip over non-PTR records
4109 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4111 [19881] string: Improve x86-64 memset
4112 [19907] string: Incorrect memcpy tests
4113 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4115 [19925] libc: termios.h XCASE namespace
4116 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4117 [19929] libc: limits.h NL_NMAX namespace
4118 [19931] stdio: Memory leak in vfprintf
4119 [19957] libc: clone(CLONE_VM) access invalid parent memory
4120 [19963] localedata: en_IL: New locale
4121 [19989] stdio: stdio.h cuserid namespace
4122 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4124 [19996] locale: langinfo.h nl_langinfo_l namespace
4125 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4126 [20010] network: getaddrinfo: Stack overflow in hostent translation
4128 [20012] stdio: libio: fmemopen append mode failure
4129 [20014] stdio: stdio.h namespace for pre-threads POSIX
4130 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4131 [20023] libc: fcntl.h timespec namespace
4132 [20024] math: [x86_64] vectorized sincos trashes the stack
4133 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4134 [20041] time: sys/time.h timespec namespace
4135 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4136 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4137 [20051] libc: ttyslot in wrong header under wrong conditions
4138 [20054] libc: gethostname not declared for XPG4
4139 [20055] libc: termios.h missing tcgetsid for XPG4
4140 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4142 [20073] libc: sys/stat.h fchmod namespace
4143 [20074] libc: stdlib.h rand_r namespace
4144 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4145 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4147 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4148 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4150 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4151 [20119] libc: Wrong mask for processors level type from CPUID
4152 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4153 AS not supporting AVX512
4154 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4156 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4157 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4159 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4160 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4161 [20178] libc: posix_spawn{p} should not call exit
4162 [20191] stdio: libio: vtables hardening
4163 [20195] string: FMA4 detection requires CPUID execution with register
4165 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4166 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4168 [20212] math: acos (sNaN) returns sNaN
4169 [20213] math: asin (sNaN) returns sNaN
4170 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4171 [20218] math: [i386] asinhl (sNaN) returns sNaN
4172 [20219] math: [i386] atanhl (sNaN) returns sNaN
4173 [20222] stdio: fopencookie: Mangle function pointers
4174 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4175 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4176 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4178 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4179 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4180 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4181 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4182 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4183 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4184 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4185 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4186 [20240] math: modf (sNaN) returns sNaN
4187 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4188 [20250] math: frexp (sNaN) returns sNaN
4189 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4190 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4192 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4193 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4194 subscript is below array bounds [-Werror=array-bounds]
4195 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4196 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4198 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4199 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4201 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4202 "invalid" exceptions
4203 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4204 [20316] localedata: id_ID: Februari instead of Pebruari
4205 [20327] string: POWER8 strcasecmp returns incorrect result
4206 [20347] math: Failure: Test: j0_downward (0xap+0)
4207 [20348] libc: FAIL: misc/tst-preadvwritev64
4208 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4209 [20350] libc: There is no test for p{read,write}64
4210 [20357] math: Incorrect cos result for 1.5174239687223976
4211 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4215 * Unicode 8.0.0 Support: Character encoding, character type info, and
4216 transliteration tables are all updated to Unicode 8.0.0, using new
4217 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4218 These updates cause user visible changes, such as the fixes for bugs
4219 89, 16061, and 18568.
4221 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4222 kernel-internal CPU set size. This means that requests that change the
4223 CPU affinity which failed before (for example, an all-ones CPU mask) will
4224 now succeed. Applications that need to determine the effective CPU
4225 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4226 setting it because the kernel can adjust it (and the previous size check
4227 would not detect this in the majority of cases).
4229 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4230 the following new symbols are used: fts64_children, fts64_close,
4231 fts64_open, fts64_read and fts64_set.
4233 * getaddrinfo now detects certain invalid responses on an internal netlink
4234 socket. If such responses are received, an affected process will
4235 terminate with an error message of "Unexpected error <number> on netlink
4236 descriptor <number>" or "Unexpected netlink response of size <number> on
4237 descriptor <number>". The most likely cause for these errors is a
4238 multi-threaded application which erroneously closes and reuses the netlink
4239 file descriptor while it is used by getaddrinfo.
4241 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4242 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4243 unnecessary serialization of memory allocation requests across threads.
4244 The defect is now corrected. Users should see a substantial increase in
4245 the concurent throughput of allocation requests for applications which
4246 trigger this bug. Affected applications typically create and
4247 destroy threads frequently. (Bug 19048 was reported and analyzed by
4250 * There is now a --disable-timezone-tools configure option for disabling the
4251 building and installing of the timezone related utilities (zic, zdump, and
4252 tzselect). This is useful for people who build the timezone data and code
4253 independent of the GNU C Library.
4255 * The obsolete header <regexp.h> has been removed. Programs that require
4256 this header must be updated to use <regex.h> instead.
4258 * The obsolete functions bdflush, create_module, get_kernel_syms,
4259 query_module and uselib are no longer available to newly linked binaries;
4260 the header <sys/kdaemon.h> has been removed. These functions and header
4261 were specific to systems using the Linux kernel and could not usefully be
4262 used with the GNU C Library on systems with version 2.6 or later of the
4265 * Optimized string, wcsmbs and memory functions for IBM z13.
4266 Implemented by Stefan Liebler.
4268 * Newly linked programs that define a variable called signgam will no longer
4269 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4270 require signgam to be set by those functions must ensure that they use the
4271 variable provided by the GNU C Library and declared in <math.h>, without
4272 defining their own copy.
4274 * The minimum GCC version that can be used to build this version of the GNU
4275 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4276 still be used to compile programs using the GNU C Library.
4278 Security related changes:
4280 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4281 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4283 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4284 the pointer guard feature. It is always enabled. Previously,
4285 LD_POINTER_GUARD could be used to disable security hardening in binaries
4286 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4289 * An integer overflow in hcreate and hcreate_r could lead to an
4290 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4292 * The catopen function no longer has unbounded stack usage. Reported by
4293 Max. (CVE-2015-8779)
4295 * The nan, nanf and nanl functions no longer have unbounded stack usage
4296 depending on the length of the string passed as an argument to the
4297 functions. Reported by Joseph Myers. (CVE-2014-9761)
4299 * A stack-based buffer overflow was found in libresolv when invoked from
4300 libnss_dns, allowing specially crafted DNS responses to seize control
4301 of execution flow in the DNS client. The buffer overflow occurs in
4302 the functions send_dg (send datagram) and send_vc (send TCP) for the
4303 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4304 family. The use of AF_UNSPEC triggers the low-level resolver code to
4305 send out two parallel queries for A and AAAA. A mismanagement of the
4306 buffers used for those queries could result in the response of a query
4307 writing beyond the alloca allocated buffer created by
4308 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4309 the overflow. Thanks to the Google Security Team and Red Hat for
4310 reporting the security impact of this issue, and Robert Holiday of
4311 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4313 The following bugs are resolved with this release:
4315 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4316 [887] math: Math library function "logb" and "nextafter" inconsistent
4317 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4318 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4319 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4320 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4322 [4404] localedata: German translation of "Alarm clock" is misleading
4323 [6799] math: nextafter() and nexttoward() doen't set errno on
4324 overflow/underflow errors
4325 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4327 [10432] nis: _nss_nis_setnetgrent assertion failure
4328 [11460] libc: fts has no LFS support
4329 [12926] network: getaddrinfo()/make_request() may spin forever
4330 [13065] nptl: Race condition in pthread barriers
4331 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4332 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4334 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4335 [14912] libc: Rename non-installed bits/*.h headers
4336 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4337 [15367] math: Let gcc use __builtin_isinf
4338 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4339 [15421] math: lgamma wrongly sets signgam for ISO C
4340 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4341 FE_INVALID with argument out of range
4342 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4344 [15786] dynamic-link: ifunc resolver functions can smash function
4346 [15918] math: Unnecessary check for equality in hypotf()
4347 [16061] localedata: Review / update transliteration data
4348 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4350 [16141] time: strptime %z offset restriction
4351 [16171] math: drem should be alias of remainder
4352 [16296] math: fegetround is pure?
4353 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4354 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4356 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4357 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4359 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4360 "Exception "Inexact" set" on ppc32
4361 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4362 [16517] math: Missing underflow exception from tanf/tan/tanl
4363 [16519] math: Missing underflow exception from sinhf
4364 [16520] math: Missing underflow exception from tanhf
4365 [16521] math: Missing underflow exception from exp2
4366 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4368 [16734] stdio: fopen calls mmap to allocate its buffer
4369 [16961] math: nan function incorrect handling of bad sequences
4370 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4371 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4372 [16985] locale: localedef: confusing error message when opening output
4374 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4375 [17197] locale: Redundant shift character in iconv conversion output at
4377 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4378 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4379 [17250] dynamic-link: static linking breaks nss loading
4380 (getaddrinfo/getpwnam/etc...)
4381 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4383 [17441] math: isnan() should use __builtin_isnan() in GCC
4384 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4385 (related to lock elision)
4386 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4387 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4388 [17887] time: strptime should be able to parse "+01:00" style timezones
4389 [17905] libc: catopen() Multiple unbounded stack allocations
4391 [18084] libc: backtrace (..., 0) dumps core on x86
4392 [18086] libc: nice() sets errno to 0 on success
4393 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4394 is too large (CVE-2015-8778)
4395 [18251] dynamic-link: SONAME missing when audit modules provides path
4396 [18265] libc: add attributes for wchar string and memory functions
4397 [18370] math: csqrt missing underflows
4398 [18421] libc: [hppa] read-only segment has dynamic relocations
4399 [18472] libc: Obsolete syscall wrappers should be compat symbols
4400 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4401 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4402 [18525] localedata: Remove locale timezone information
4403 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4404 [18568] localedata: Update locale data to Unicode 8.0
4405 [18589] locale: sort-test.sh fails at random
4406 [18595] math: ctan, ctanh missing underflows
4407 [18604] libc: assert macro-expands its argument
4408 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4409 contains a vector instruction exception.
4410 [18611] math: j1, jn missing errno setting on underflow
4411 [18618] localedata: sync Chechen locale definitions with other *_RU
4413 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4414 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4415 [18665] network: In send_dg, the recvfrom function is NOT always using the
4416 buffer size of a newly created buffer (CVE-2015-7547)
4417 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4419 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4421 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4422 [18699] math: tilegx cproj() for various complex infinities does not yield
4424 [18724] libc: Harden put*ent functions against data injection
4425 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4426 [18755] build: build errors with -DNDEBUG
4427 [18757] stdio: fmemopen fails to set errno on failure
4428 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4430 [18781] libc: openat64 lacks O_LARGEFILE
4431 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4432 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4433 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4434 [18790] math: [ldbl-128ibm] tanhl inaccurate
4435 [18795] libc: stpncpy fortification misses buffer lengths that are
4436 statically too large
4437 [18796] build: build fails for --disable-mathvec
4438 [18803] math: hypot missing underflows
4439 [18820] stdio: fmemopen may leak memory on failure
4440 [18823] math: csqrt spurious underflows
4441 [18824] math: fma spurious underflows
4442 [18825] math: pow missing underflows
4443 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4444 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4445 [18870] build: sem_open.c fails to compile with missing symbol
4447 [18872] stdio: Fix memory leak in printf_positional
4448 [18873] libc: posix_fallocate overflow check ineffective
4449 [18875] math: Excess precision leads incorrect libm
4450 [18877] libc: arm: mmap offset regression
4451 [18887] libc: memory corruption when using getmntent on blank lines
4452 [18918] localedata: hu_HU: change time to HH:MM:SS format
4453 [18921] libc: Regression: extraneous stat() and fstat() performed by
4455 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4456 binaries (CVE-2015-8777)
4457 [18951] math: tgamma missing underflows
4458 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4460 [18953] localedata: lt_LT: change currency symbol to the euro
4461 [18956] math: powf inaccuracy
4462 [18961] math: [i386] exp missing underflows
4463 [18966] math: [i386] exp10 missing underflows
4464 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4465 [18969] build: multiple string test failures due to missing locale
4467 [18970] libc: Reference of pthread_setcancelstate in libc.a
4468 [18977] math: float / long double Bessel functions not in XSI POSIX
4469 [18980] math: i386 libm functions return with excess range and precision
4470 [18981] math: i386 scalb*, ldexp return with excess range and precision
4471 [18982] stdio: va_list and vprintf
4472 [18985] time: Passing out of range data to strftime() causes a segfault
4474 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4475 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4476 [19012] locale: iconv_open leaks memory on error path
4477 [19016] math: clog, clog10 inaccuracy
4478 [19018] nptl: Mangle function pointers in tls_dtor_list
4479 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4480 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4481 [19048] malloc: malloc: arena free list can become cyclic, increasing
4483 [19049] math: [powerpc] erfc incorrect zero sign
4484 [19050] math: [powerpc] log* incorrect zero sign
4485 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4486 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4487 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4488 [19074] network: Data race in _res_hconf_reorder_addrs
4489 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4490 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4491 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4493 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4495 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4496 [19086] manual: posix_fallocate64 documented argument order is wrong.
4497 [19088] math: lround, llround missing exceptions close to overflow
4499 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4500 [19095] math: dbl-64 lrint incorrect for 64-bit long
4501 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4502 [19124] dynamic-link: ld.so failed to build with older assmebler
4503 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4504 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4505 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4506 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4507 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4508 pthread_setaffinity_np
4509 [19156] math: [ldbl-128] j0l spurious underflows
4510 [19164] nptl: tst-getcpu fails with many possible CPUs
4511 [19168] math: math/test-ildoubl and math/test-ldouble failure
4512 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4513 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4515 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4516 (FE_NOMASK_ENV) do not clear SSE exceptions
4517 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4518 _int_new_arena/reused_arena
4519 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4520 [19201] math: dbl-64 remainder incorrect sign of zero result
4521 [19205] math: bits/math-finite.h conditions do not match math.h and
4523 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4524 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4525 for C99-based standards
4526 [19212] libc: features.h not -Wundef clean
4527 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4529 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4530 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4531 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4533 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4534 "inexact" exceptions
4535 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4537 [19242] libc: strtol incorrect in Turkish locales
4538 [19243] malloc: reused_arena can pick an arena on the free list, leading
4539 to an assertion failure and reference count corruption
4540 [19253] time: tzset() ineffective when temporary TZ did not include DST
4542 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4543 [19270] math: [hppa] Shared libm missing __isnanl
4544 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4545 MAP_HUGETLB and MAP_STACK defines
4546 [19313] nptl: Wrong __cpu_mask for x32
4547 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4548 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4549 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4550 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4551 [19363] time: x32: times() return value wrongly truncates/sign extends
4553 [19367] dynamic-link: Improve branch prediction on Silvermont
4554 [19369] network: Default domain name not reset by res_ninit when "search"
4555 / "domain" entry is removed from resolv.conf
4556 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4558 [19385] localedata: bg_BG: time separator should be colon, not comma
4559 [19408] libc: linux personality syscall wrapper may erroneously return an
4560 error on 32-bit architectures
4561 [19415] libc: dladdr returns wrong names on hppa
4562 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4563 IBM905, IBM907, and IBM909
4564 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4565 [19443] build: build failures with -DDEBUG
4566 [19451] build: Make check fails on test-double-vlen2
4567 [19462] libc: Glibc failed to build with -Os
4568 [19465] math: Wrong code with -Os
4569 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4571 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4573 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4574 [19486] math: S390: Math tests fail with "Exception Inexact set".
4575 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4576 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4578 [19590] math: Fail to build shared objects that use libmvec.so functions.
4582 * The following bugs are resolved with this release:
4584 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4585 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4586 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4587 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4588 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4589 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4590 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4591 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4592 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4593 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4594 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4595 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4596 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4597 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4598 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4599 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4600 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4601 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4602 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4603 18657, 18676, 18694, 18696, 18887.
4605 * Cache information can be queried via sysconf() function on s390 e.g. with
4606 _SC_LEVEL1_ICACHE_SIZE as argument.
4608 * A buffer overflow in gethostbyname_r and related functions performing DNS
4609 requests has been fixed. If the NSS functions were called with a
4610 misaligned buffer, the buffer length change due to pointer alignment was
4611 not taken into account. This could result in application crashes or,
4612 potentially arbitrary code execution, using crafted, but syntactically
4613 valid DNS responses. (CVE-2015-1781)
4615 * The time zone file parser has been made more robust against crafted time
4616 zone files, avoiding heap buffer overflows related to the processing of
4617 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4618 large time zone data files. Overly long time zone specifiers in the TZ
4619 variable no longer result in stack overflows and crashes.
4621 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4622 for LD and GD on x86 and x86-64, has been implemented. You will need
4623 binutils-2.24 or later to enable this optimization.
4625 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4626 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4627 Hat). These updates cause user visible changes, such as the fix for bug
4630 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4631 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4632 condition in some applications.
4634 * Added vector math library named libmvec with the following vectorized x86_64
4635 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4637 The library can be disabled with --disable-mathvec. Use of the functions is
4638 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4639 Shared library libmvec.so is linked in as needed when using -lm (no need to
4640 specify -lmvec explicitly for not static builds).
4641 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4643 * A new fmemopen implementation has been added with the goal of POSIX
4644 compliance. The new implementation fixes the following long-standing
4645 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4646 old implementation is still present for use be by existing binaries.
4648 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4649 releases. It has been fixed to match 2.19 and older, but binaries built
4650 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4652 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4653 Contributed by Roland McGrath (Google).
4655 * The header <regexp.h> is deprecated, and will be removed in a future
4656 release. Use of this header will trigger a deprecation warning.
4657 Application developers should update their code to use <regex.h> instead.
4659 This header was formerly part of SUS, but was deprecated in 1994 and
4660 removed from the standard in 2001. Also, the glibc implementation
4661 leaks memory. See BZ#18681 for more details.
4665 * The following bugs are resolved with this release:
4667 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4668 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4669 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4670 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4671 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4672 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4673 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4674 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4675 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4676 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4679 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4680 too little memory for the to-be-scanned arguments and overflow the
4681 allocated buffer. The implementation now correctly computes the required
4682 buffer size when using malloc, and switches to malloc from alloca as
4685 * A new semaphore algorithm has been implemented in generic C code for all
4686 machines. Previous custom assembly implementations of semaphore were
4687 difficult to reason about or ensure that they were safe. The new version
4688 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4689 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4690 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4692 * Port to Altera Nios II has been contributed by Mentor Graphics.
4694 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4695 implementations for powerpc64/powerpc64le.
4696 Implemented by Adhemerval Zanella (IBM).
4698 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4699 and powerpc64le. This may improve lock scaling of existing programs on
4700 HTM capable systems. The lock elision code is only enabled with
4701 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4702 powerpc will issue a transaction abort on every syscall to avoid side
4703 effects being visible outside transactions.
4705 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4706 AArch64. Contributed by ARM Ltd.
4708 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4710 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4711 under certain input conditions resulting in the execution of a shell for
4712 command substitution when the application did not request it. The
4713 implementation now checks WRDE_NOCMD immediately before executing the
4714 shell and returns the error WRDE_CMDSUB as expected.
4716 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4717 processing format strings with a large number of format specifiers.
4719 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4720 infinite loop if the DNS response contained a PTR record of an unexpected
4723 * The minimum GCC version that can be used to build this version of the GNU
4724 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4725 still be used to compile programs using the GNU C Library.
4727 * The GNU C Library is now built with -Werror by default. This can be
4728 disabled by configuring with --disable-werror.
4730 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4732 * The obsolete sigvec function has been removed. This was the original
4733 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4734 programs have been using instead for about 25 years. Of course, ABI
4735 compatibility for old binaries using sigvec remains intact.
4737 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4738 with newer versions of bison.
4740 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4741 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4742 registers overlay two consecutive single-precision registers. MIPS32R2
4743 introduced a new FPU mode (FR=1) where double-precision registers extend the
4744 corresponding single-precision registers which is incompatible with the
4745 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4746 require the use of FR=1 making a transition necessary. New o32 ABI
4747 extensions enable users to migrate over time from the original o32 ABI
4748 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4749 tracks the ABI of any loaded object and verifies that new objects are
4750 compatible. Mode transitions will also be requested as required and
4751 unsupportable objects will be rejected. The ABI checks include both soft and
4752 hard float ABIs for o32, n32 and n64.
4754 GCC 5 with GNU binutils 2.25 onwards:
4755 It is strongly recommended that all o32 system libraries are built using the
4756 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4757 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4758 compiler using --with-fp-32=xx to set this by default.
4762 * The following bugs are resolved with this release:
4764 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4765 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4766 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4767 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4768 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4769 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4770 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4771 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4772 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4773 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4774 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4775 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4776 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4777 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4778 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4780 * Reverted change of ABI data structures for s390 and s390x:
4781 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4782 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4783 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4784 are preserved pointing straight to the same implementation as the old ones.
4785 Given that, new callers will simply provide a too-big buffer to these
4786 functions. Any applications/libraries out there that embed jmp_buf or
4787 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4788 against 2.19 headers will have to rebuilt again. This is necessary in any
4789 case to revert the breakage in their ABI caused by the glibc change.
4791 * Support for file description locks is added to systems running the
4792 Linux kernel. The standard file locking interfaces are extended to
4793 operate on file descriptions, not file descriptors, via the use of
4794 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4795 are associated with an open file instead of a process.
4797 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4799 * The minimum Linux kernel version that this version of the GNU C Library
4800 can be used with is 2.6.32.
4802 * Running the testsuite no longer terminates as soon as a test fails.
4803 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4804 with PASS or FAIL lines for individual tests. A summary of the results is
4805 printed, including a list of failing lists, and "make check" exits with
4806 error status if there were any unexpected failures. "make check
4807 stop-on-test-failure=y" may be used to keep the old behavior.
4809 * The am33 port, which had not worked for several years, has been removed
4812 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4813 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4814 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4815 conflicted with POSIX (support for which was removed in 2.19), the
4816 interfaces those macros enabled remain available when compiling with
4817 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4818 test macros defined.
4820 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4822 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4823 This may improve lock scaling of existing programs on TX capable systems.
4824 The lock elision code is only built with --enable-lock-elision=yes and
4825 then requires a GCC version supporting the TX builtins. With lock elision
4826 default mutexes are elided via __builtin_tbegin, if the cpu supports
4827 transactions. By default lock elision is not enabled and the elision code
4830 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4831 copy the path argument. This allowed programs to cause posix_spawn to
4832 deference a dangling pointer, or use an unexpected pathname argument if
4833 the string was modified after the posix_spawn_file_actions_addopen
4836 * All supported architectures now use the main glibc sysdeps directory
4837 instead of some being in a separate "ports" directory (which was
4838 distributed separately before glibc 2.17).
4840 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4841 On configurations that support it (all Linux configurations), it's now
4842 used regardless of the --enable-add-ons switch to configure. It is no
4843 longer possible to build such configurations without pthreads support.
4845 * Locale names, including those obtained from environment variables (LANG
4846 and the LC_* variables), are more tightly checked for proper syntax.
4847 setlocale will now fail (with EINVAL) for locale names that are overly
4848 long, contain slashes without starting with a slash, or contain ".." path
4849 components. (CVE-2014-0475) Previously, some valid locale names were
4850 silently replaced with the "C" locale when running in AT_SECURE mode
4851 (e.g., in a SUID program). This is no longer necessary because of the
4854 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4855 with application code using Intel MPX instructions. (With all previous
4856 versions, the MPX register state could be clobbered when making calls
4857 into or out of a shared library.) Note that while the new dynamic
4858 linker is compatible with all known x86 hardware whether or not it
4859 supports Intel MPX, some x86 instruction-set emulators might fail to
4860 handle the new instruction encodings. This is known to affect Valgrind
4861 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4862 release), and might affect other tools that do instruction emulation.
4864 * Support for loadable gconv transliteration modules has been removed.
4865 The support for transliteration modules has been non-functional for
4866 over a decade, and the removal is prompted by security defects. The
4867 normal gconv conversion modules are still supported. Transliteration
4868 with //TRANSLIT is still possible, and the //IGNORE specifier
4869 continues to be supported. (CVE-2014-5119)
4871 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4872 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4873 resulting a denial-of-service security vulnerability in applications which
4874 use functions related to iconv. (CVE-2014-6040)
4878 * The following bugs are resolved with this release:
4880 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4881 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4882 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4883 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4884 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4885 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4886 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4887 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4888 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4889 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4890 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4891 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4892 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4893 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4894 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4895 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4896 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4897 16431, 16453, 16474, 16506, 16510, 16529
4899 * Slovenian translations for glibc messages have been contributed by the
4900 Translation Project's Slovenian team of translators.
4902 * The public headers no longer use __unused nor __block. This change is to
4903 support compiling programs that are derived from BSD sources and use
4904 __unused internally, and to support compiling with Clang's -fblock
4905 extension which uses __block.
4907 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4908 large collation sequences to optimize multiple passes. This cache
4909 computation may overflow for large collation sequences and may cause a
4910 stack or buffer overflow. This is now fixed to use a slower algorithm
4911 which does not use a cache if there is an integer overflow.
4913 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4914 rules for large collation sequences to optimize multiple passes and falls
4915 back to alloca if malloc fails, resulting in a possible stack overflow.
4916 The implementation now falls back to an uncached collation sequence lookup
4919 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4920 initialized for static applications resulting in the security feature
4921 being disabled. The pointer guard is now correctly initialized to a
4922 random value for static applications. Existing static applications need
4923 to be recompiled to take advantage of the fix (bug 15754).
4925 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4926 to the d_name member of struct dirent, or omit the terminating NUL
4927 character. (Bugzilla #14699).
4929 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4930 aligned_alloc functions could allocate too few bytes or corrupt the
4931 heap when passed very large allocation size values (Bugzilla #15855,
4934 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4935 for AF_INET6 has been fixed (Bugzilla #16072).
4937 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4938 pap_CW, quz_PE, the_NP.
4940 * Substantially revised locales: gd_GB, ht_HT
4942 * The LC_ADDRESS field was updated to support country_car for almost all
4945 * ISO 1427 definitions were updated.
4947 * ISO 3166 definitions were updated.
4949 * The localedef utility now supports --big-endian and --little-endian
4950 command-line options to generate locales for a different system from that
4951 for which the C library was built.
4953 * Binary locale files now only depend on the endianness of the system for
4954 which they are generated and not on other properties of that system. As a
4955 consequence, binary files generated with new localedef may be incompatible
4956 with old versions of the GNU C Library, and binary files generated with
4957 old localedef may be incompatible with this version of the GNU C Library,
4958 in the following circumstances:
4960 + Locale files may be incompatible on m68k systems.
4962 + Locale archive files (but not separate files for individual locales) may
4963 be incompatible on systems where plain "char" is signed.
4965 * The configure option --disable-versioning has been removed. Builds with
4966 --disable-versioning had not worked for several years.
4968 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4969 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4971 * SystemTap probes for malloc have been introduced.
4973 * SystemTap probes for slow multiple precision fallback paths of
4974 transcendental functions have been introduced.
4976 * Support for powerpc64le has been added.
4978 * The soft-float powerpc port now supports e500 processors.
4980 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4982 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4983 set of header declarations that are enabled by default, even when other
4984 feature test macros or compiler options such as -std=c99 would otherwise
4985 disable some of those declarations.
4987 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4988 conflict with POSIX. The libbsd-compat library (which was a dummy library
4989 that did nothing) has also been removed.
4991 * Preliminary documentation about Multi-Thread, Async-Signal and
4992 Async-Cancel Safety has been added.
4994 * Change of ABI data structures for s390 and s390x:
4995 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4996 allow for future hardware extensions. All library functions that accept or
4997 return these structures were versioned in order to provide backwards
4998 compatibility with existing code. However, not all cases can be handled
4999 with interface versioning. If an application embeds either structure into
5000 another structure and that structure is passed to another compilation unit
5001 which expects the newer larger-sized object then any access to the new
5002 fields will result in undefined behaviour. Similarly any access to fields
5003 that were moved by the enlarging of the structures will cause undefined
5004 behaviour. To fix the undefined behaviour all objects that are part of the
5005 final in-memory image must agree on the size of structures, and this may
5006 require recompilation.
5010 * The following bugs are resolved with this release:
5012 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5013 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5014 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5015 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5016 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5017 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5018 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5019 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5020 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5021 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5022 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5023 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5024 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5027 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5028 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5029 Distributions can re-enable building and using pt_chown via the new configure
5030 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5031 considerable security risks and should only be used if the distribution
5032 understands and accepts the risks.
5034 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5037 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5038 fixed (Bugzilla #15330).
5040 * Add support for calling C++11 thread_local object destructors on thread
5041 and program exit. This needs compiler support for offloading C++11
5042 destructor calls to glibc.
5044 * Improved worst case performance of libm functions with double inputs and
5047 * Support for priority inherited mutexes in pthread condition variables on
5048 non-x86 architectures.
5050 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5052 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5054 * Optimized string functions for ARM. Implemented by Will Newton and
5057 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5059 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5062 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5063 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5065 * Added a benchmark framework to track performance of functions in glibc.
5067 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5068 It is based on draft TS 18661 and currently enabled as a GNU extension.
5070 * On Linux, the clock function now uses the clock_gettime system call
5071 for improved precision, rather than old times system call.
5073 * Added support for version-3 tz format files. This is needed when using
5074 the tz database release 2013e or later, and affects a few unusual cases --
5075 currently only TZ='America/Godthab' for time stamps after 2037.
5077 * Added new API functions pthread_getattr_default_np and
5078 pthread_setattr_default_np to get and set the default pthread
5079 attributes of a process.
5081 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5082 This may improve lock scaling of existing programs on TSX capable systems.
5083 When the --enable-lock-elision=yes parameter is specified at configure
5084 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5087 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5088 availability). Implemented by Ryan S. Arnold.
5090 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5094 * The following bugs are resolved with this release:
5096 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5097 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5098 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5099 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5100 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5101 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5102 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5103 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5104 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5105 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5106 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5107 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5108 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5109 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5110 14879, 14889, 14893, 14898, 14914.
5112 * Optimization of memcpy for MIPS.
5114 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5115 EMFILE has been fixed (Bugzilla #14889).
5117 * The add-on ports collection is now distributed in the "ports" subdirectory
5118 of the main GNU C Library distribution, rather than separately.
5120 * Port to ARM AArch64 contributed by Linaro.
5122 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5123 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5125 Implemented by Andreas Krebbel.
5127 * The new function secure_getenv allows secure access to the environment,
5128 returning NULL if running in a SUID/SGID process. This function replaces
5129 the internal function __secure_getenv.
5131 * SystemTap static probes have been added into the dynamic linker.
5132 Implemented by Gary Benson.
5134 * Optimizations of string functions strstr, strcasestr and memmem.
5135 Implemented by Maxim Kuvyrkov.
5137 * The minimum Linux kernel version that this version of the GNU C Library
5138 can be used with is 2.6.16.
5140 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5141 powerpc POWER7. Implemented by Will Schmidt.
5143 * New configure option --disable-nscd builds the C library such that it
5144 never attempts to contact the Name Service Caching Daemon (nscd).
5145 New configure option --disable-build-nscd avoids building nscd itself;
5146 this is the default if --disable-nscd is used.
5148 * Improved support for cross-compilation, including cross-testing and
5149 bootstrap builds without a previously built glibc.
5151 * Several testsuite tests are now able to test multiple IFUNC variants of an
5152 interface, rather than just testing the one that would be chooen by
5155 * New configure options --with-bugurl and --with-pkgversion, for
5156 distributors to use to embed their bug-reporting and package version
5157 information in --help and --version output.
5159 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5160 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5161 allows creation of chroots without the procfs mounted on /proc.
5163 * The `crypt' function now fails if passed salt bytes that violate the
5164 specification for those values. On Linux, the `crypt' function will
5165 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5166 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5167 when the mode is enabled.
5169 * The `clock_*' suite of functions (declared in <time.h>) is now available
5170 directly in the main C library. Previously it was necessary to link with
5171 -lrt to use these functions. This change has the effect that a
5172 single-threaded program that uses a function such as `clock_gettime' (and
5173 is not linked with -lrt) will no longer implicitly load the pthreads
5174 library at runtime and so will not suffer the overheads associated with
5175 multi-thread support in other code such as the C++ runtime library.
5177 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5182 * The following bugs are resolved with this release:
5184 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5185 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5186 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5187 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5188 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5189 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5190 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5191 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5192 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5193 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5194 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5195 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5196 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5197 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5198 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5199 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5200 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5201 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5202 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5203 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5204 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5205 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5208 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5209 configuring glibc with:
5210 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5211 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5212 Implemented by H.J. Lu.
5216 + define static_assert
5218 + do not declare gets
5220 + declare at_quick_exit and quick_exit also for ISO C11
5222 + aligned_alloc. NB: The code is deliberately allows the size parameter
5223 to not be a multiple of the alignment. This is a moronic requirement
5224 in the standard but it is only a requirement on the caller, not the
5227 + timespec_get added
5229 + uchar.h support added
5231 + CMPLX, CMPLXF, CMPLXL added
5233 Implemented by Ulrich Drepper.
5235 * Support for the IA-64 has been moved to ports.
5237 * Remove support for anything but ELF binary format
5239 * Checking versions of poll, ppoll added.
5240 Implemented by Ulrich Drepper.
5242 * More generic and 64-bit performance optimizations to math functions.
5243 Implemented by Ulrich Drepper.
5245 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5246 headers and functions available at compile time as they were before
5247 version 2.14. This option will be removed at some time in the future
5248 after the TI-RPC library becomes fully sufficient for the needs of
5249 existing applications.
5251 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5252 Note that glibc is not expected to work with any Linux kernel version
5255 * New header <sys/auxv.h> and function getauxval allowing easy access to
5256 the AT_* key-value pairs passed from the Linux kernel. The header also
5257 defines the HWCAP_* bits associated with the AT_HWCAP key.
5259 * New locales: mag_IN
5261 * New configure option --enable-systemtap builds SystemTap static probes
5262 into libc for setjmp and longjmp and into libpthread for various operations.
5263 So far the setjmp/longjmp probes and some of the libpthread probes are
5264 provided only for i*86 and x86_64.
5265 Implemented by Roland McGrath and Rayson Ho.
5267 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5269 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5272 * More optimized functions for SPARC. Implemented by David S. Miller.
5274 * Improved support for cross-compilation, especially bootstrap builds
5275 without a previously built glibc.
5277 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5278 Chris Metcalf from Tilera.
5280 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5281 now supported for ARM processors.
5283 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5284 as the name of the dynamic linker, to distinguish it from the
5285 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5287 * Support for CRIS has been removed from ports.
5289 * A new class of installed header has been documented for low-level
5290 platform-specific functionality. PowerPC added the first instance with a
5291 function to provide time base register access. Contributed by Tulio
5292 Magno Quites Machado Filho.
5294 * ix86 configurations now install header files that are consistent with
5295 what x86-64 configurations install. These same header files can be used
5296 for -m32, -m64, or -mx32 builds.
5297 Contributed by H.J. Lu.
5299 * Math library bug fixes. A thorough audit of all open math library bugs was
5300 conducted by Joseph Myers. Significant progress was made on many math
5301 library bugs resulting in more accurate exceptions and function results.
5302 Many thanks to all those that contributed including Andreas Jaeger for his
5303 patch review and work on the x87 trigonometric instruction issues.
5305 * Timezone data is no longer installed. Timezone-related binaries and scripts
5306 will continue to be installed. Users should obtain their timezone data from
5307 their distribution provider or from the tzdata package at
5308 <ftp://munnari.oz.au/pub/>.
5312 * The following bugs are resolved with this release:
5314 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5315 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5316 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5317 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5318 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5319 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5320 13484, 13506, 13515, 13523, 13524, 13538, 13540
5322 * New program pldd to list loaded object of a process
5323 Implemented by Ulrich Drepper.
5325 * Add nss_db support back to glibc. No more dependency on Berkeley db
5326 and support for initgroups lookups.
5327 Implemented by Ulrich Drepper.
5329 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5330 Contributed by HJ Lu.
5332 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5333 Contributed by HJ Lu.
5335 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5336 on x86-32 and x86-64.
5337 Contributed by Liubov Dmitrieva.
5339 * Optimized strchr and strrchr for SSE on x86-32.
5340 Contributed by Liubov Dmitrieva.
5342 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5343 for x86-64 and x86-32.
5344 Contributed by Liubov Dmitrieva.
5346 * New interfaces: scandirat, scandirat64
5347 Implemented by Ulrich Drepper.
5349 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5350 Implemented by Ulrich Drepper.
5352 * nscd now also caches the netgroup database.
5353 Implemented by Ulrich Drepper.
5355 * Integrate libm with gcc's -ffinite-math-only option.
5356 Implemented by Ulrich Drepper.
5358 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5359 to math functions. Implemented by Ulrich Drepper.
5361 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5362 Implemented by Ulrich Drepper.
5364 * New Linux interfaces: process_vm_readv, process_vm_writev
5366 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5367 Implemented by Ulrich Drepper.
5369 * Optimized nearbyint and strcasecmp for PPC.
5370 Implemented by Adhemerval Zanella.
5372 * New locales: bho_IN, unm_US, es_CU, ta_LK
5376 * The following bugs are resolved with this release:
5378 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5379 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5380 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5381 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5382 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5383 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5384 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5385 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5386 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5387 12795, 12811, 12813, 12814, 12841
5389 * The RPC implementation in libc is obsoleted. Old programs keep working
5390 but new programs cannot be linked with the routines in libc anymore.
5391 Programs in need of RPC functionality must be linked against TI-RPC.
5392 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5394 Visible changes of this change include (obviously) the inability to link
5395 programs using RPC functions without referencing the TI-RPC library and the
5396 removal of the RPC headers from the glibc headers.
5397 Implemented by Ulrich Drepper.
5399 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5400 syncfs, setns, sendmmsg
5402 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5403 yue_HK, lij_IT, mhr_RU
5405 * New encodings: CP770, CP771, CP772, CP773, CP774
5407 * New program sotruss to trace calls through PLTs
5408 Implemented by Ulrich Drepper.
5410 * The malloc hook implementation is marked deprecated and will be removed
5411 from the default implementation in the next version. The design never
5412 worked ever since the introduction of threads. Even programs which do
5413 not create threads themselves can use multiple threads created internally.
5417 * The following bugs are resolved with this release:
5419 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5420 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5421 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5422 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5425 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5427 * POWER7 optimizations: memset, memcmp, strncmp
5429 * New optimized string functions for x86-64: strnlen (SSE2),
5430 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5431 Implemented by Ulrich Drepper.
5435 * The following bugs are resolved with this release:
5437 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5438 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5439 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5440 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5441 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5442 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5443 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5444 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5446 * New interfaces: pthread_getname_np, pthread_setname_np
5448 * New Linux interface: recvmmsg
5450 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5452 * The dynamic linker now recognizes supported ABI versions from the
5453 EI_ABIVERSION field in the ELF header.
5454 Implemented by Ulrich Drepper.
5456 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5457 will not be used to fill in password fields in the passwd.byname replies.
5458 Instead it is used to synthesize the shadow.byname table, should it be
5459 missing. This is a useful mode in some installations involving Solaris.
5460 Implemented by Ulrich Drepper.
5462 * New locales: kok_IN, sq_MK, cv_RU
5466 * The following bugs are resolved with this release:
5468 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5469 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5470 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5471 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5472 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5473 10789, 10817, 10823, 10840, 10847
5475 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5477 Implemented by Ulrich Drepper.
5479 * Checking version of longjmp added that fails if an uninitialized stack
5480 frame would be created. Implemented by Ulrich Drepper.
5482 * STT_GNU_IFUNC is now supported in static executables.
5483 Implemented by H.J. Lu.
5485 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5487 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5488 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5489 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5490 Contributed by H.J. Lu.
5492 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5493 Implemented by Ulrich Drepper.
5495 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5497 Contributed by H.J. Lu.
5499 * Support for fma instruction in AVX on x86-64.
5500 Implemented by H.J. Lu and Ulrich Drepper.
5502 * AVX support in x86-64 auditing support in ld.so.
5503 Implemented by H.J. Lu.
5505 * STB_GNU_UNIQUE support added.
5506 Implemented by Ulrich Drepper.
5508 * Implement second fallback mode for optimized DNS lookup for even more
5509 broken environments. If two requests from the same port are not
5510 handled correctly close the socket and open a new one before sending
5511 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5512 can be used to select this mode right away, instead of rediscovering the
5513 necessity is every process again.
5514 Implemented by Ulrich Drepper.
5516 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5517 Implemented by Adam Tkac.
5519 * Optimized iconv conversions for S390x.
5520 Implemented by Andreas Krebbel.
5522 * Using condvars with PI mutexes is now more efficient due to kernel
5523 support for requeueing to PI futexes. NPTL support added for x86-64.
5524 Implemented by Ulrich Drepper.
5526 * New locales: ps_AF, my_MM
5530 * The following bugs are resolved with this release:
5532 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5533 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5534 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5535 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5536 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5538 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5539 Implemented by Ulrich Drepper.
5541 * New Linux interfaces: accept4, fallocate, fallocate64.
5542 Implemented by Ulrich Drepper.
5544 * Correct declarations of string function when used in C++ code. This
5545 could lead to compile errors for invalid C++ code.
5547 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5550 * New POSIX 2008 interface: psiginfo
5551 Implemented by Ulrich Drepper.
5553 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5554 Implemented by Ulrich Drepper.
5556 * Support for selecting between multiple function definitions at runtime
5557 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5559 * The libcrypt library can now use the hash function implementations in
5560 NSS. Implemented by Ulrich Drepper.
5562 * The malloc implementation can be compiled to be less memory efficient
5563 but higher performing in multi-threaded programs.
5564 Implemented by Ulrich Drepper.
5566 * New locales: nan_TW@latin, ks_IN
5568 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5569 Implemented by Ulrich Drepper.
5571 * Extended printf hook support. It is possible to use user-defined types
5572 and extend existing format specifiers.
5573 Implemented by Ulrich Drepper.
5575 * Handling for group shadow files has been added.
5576 Implemented by Ulrich Drepper.
5578 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5579 servers (the case, e.g., for some people using the built-in DNS
5580 server in ADSL modems/routers). There is a once-per-process timeout
5581 in case of a broken server. To avoid it, users can run nscd or put
5582 'options single-request' in /etc/resolv.conf.
5583 Implemented by Ulrich Drepper.
5587 * The following bugs are resolved with this release:
5589 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5590 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5591 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5592 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5593 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5595 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5596 up at the same time. Implemented by Ulrich Drepper.
5598 * TLS descriptors for LD and GD on x86 and x86-64.
5599 Implemented by Alexandre Oliva.
5601 * getaddrinfo now handles DCCP and UDPlite.
5602 Implemented by Ulrich Drepper.
5604 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5605 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5606 Implemented by Ulrich Drepper.
5608 * New implementation of memmem, strstr, and strcasestr which is O(n).
5609 Implemented by Eric Blake.
5611 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5613 * Implement "e" option for popen to open file descriptor with the
5614 close-on-exec flag set. Implemented by Ulrich Drepper.
5616 * Implement "b" mode for fmemopen. In this mode writes writes don't
5617 implicitly add a NUL byte and seeks from the end of the buffer really
5618 use the buffer end, not the string length as the basis.
5619 Implemented by Ulrich Drepper.
5621 * Many functions, exported and internal, now atomically set the close-on-exec
5622 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5624 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5626 Implemented by Pravin Satpute.
5628 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5632 * The following bugs are resolved with this release:
5634 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5635 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5636 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5637 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5638 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5639 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5640 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5642 * New locales: bo_CN, bo_IN, shs_CA.
5644 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5646 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5647 Implemented by Pravin Satpute.
5649 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5651 * nscd caches now all timeouts for DNS entries
5652 Implemented by Ulrich Drepper.
5654 * nscd is more efficient and wakes up less often.
5655 Implemented by Ulrich Drepper.
5657 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5658 vdprintf, and obstack_vprintf.
5659 Implemented by Jakub Jelinek.
5661 * Faster memset for x86-64.
5662 Implemented by Harsha Jagasia and H.J. Lu.
5664 * Faster memcpy on x86.
5665 Implemented by Ulrich Drepper.
5667 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5668 Implemented by Ulrich Drepper.
5670 * Faster sqrt and sqrtf implemention for some PPC variants.
5671 Implemented by Steven Munroe.
5675 * The following bugs are resolved with this release:
5677 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5678 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5679 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5680 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5681 5071, 5103, 5104, 5112, 5113, 5184, 5186
5683 * More checking functions: fread, fread_unlocked, open*, mq_open.
5684 Implemented by Jakub Jelinek and Ulrich Drepper.
5686 * Extend fortification to C++. Implemented by Jakub Jelinek.
5688 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5689 by not recognizing 'a' as a modifier when those specs are requested.
5690 Implemented by Jakub Jelinek.
5692 * PPC optimizations to math and string functions.
5693 Implemented by Steven Munroe.
5695 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5696 options to be passed. Implemented by Ulrich Drepper.
5698 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5700 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5701 Implemented by Ulrich Drepper.
5703 * Handle private futexes in the NPTL implementation.
5704 Implemented by Jakub Jelinek and Ulrich Drepper.
5706 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5707 Implemented by Roland McGrath and Ulrich Drepper.
5709 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5711 * SHA-256 and SHA-512 based password encryption.
5712 Implemented by Ulrich Drepper.
5714 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5715 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5718 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5719 Implemented by Ulrich Drepper.
5723 * The following bugs are resolved with this release:
5725 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5726 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5727 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5728 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5729 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5730 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5731 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5734 * New Linux interfaces: epoll_pwait, sched_getcpu.
5736 * New generic interfaces: strerror_l.
5738 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5742 * The following bugs are resolved with this release:
5744 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5745 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5746 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5747 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5748 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5749 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5750 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5751 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5752 3225, 3251, 3252, 3253, 3273
5754 * For Linux, the sorting of addresses returned by getaddrinfo now also
5755 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5756 Implemented by Ulrich Drepper.
5758 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5759 Implemented by Ulrich Drepper.
5761 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5763 * New iconv module for MIK. Contributed by Alexander Shopov.
5765 * For sites with broken group and/or passwd database, the auto-propagate
5766 option of nscd can prevent creating ID lookup entries from the results
5767 of a name lookup and vice versa. This usually is no problem but some
5768 site might have problems with the default behavior.
5769 Implemented by Ulrich Drepper.
5771 * Iterating over entire database in NIS can be slow. With the
5772 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5773 to trade time for memory. The entire database will be read at once.
5774 Implemented by Ulrich Drepper.
5776 * The interfaces introduced in RFC 3542 have been implemented by
5779 * Support for the new ELF hash table format was added by Ulrich Drepper.
5781 * Support for priority inheritance mutexes added by Jakub Jelinek and
5784 * Support for priority protected mutexes added by Jakub Jelinek.
5786 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5787 or_IN, csb_PL, fy_NL, sr_ME.
5791 * More overflow detection functions.
5793 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5794 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5796 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5797 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5798 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5799 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5800 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5801 by Masahide Washizawa.
5803 * It is now possible to install audit libraries for the dynamic linker using
5804 LD_AUDIT. Implemented by Ulrich Drepper.
5806 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5807 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5808 For a libc and libpthread that works well on Linux 2.4 kernels, we
5809 recommend using the stable 2.3 branch.
5811 * The new function open_wmemstream acts like open_memstream,
5812 but uses a wchar_t wide character buffer.
5814 * The new function ppoll is an improved version of poll, similar to pselect.
5816 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5817 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5818 renameat, unlinkat, linkat, symlinkat, readlinkat.
5820 * New Linux kernel system calls: unshare,
5821 inotify_init, inotify_add_watch, inotify_rm_watch.
5823 * The euidaccess function is now also known by the alias eaccess,
5824 for compatibility with some other systems.
5826 * Timezone data updated to 2006b version.
5830 * The following bugs are resolved with this release:
5832 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5833 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5834 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5835 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5836 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5837 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5839 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5841 * As of this release, GCC 4 can be used to compile the C Library.
5843 * Timezone data updated to 2005m version.
5847 * The following bugs are resolved with this release:
5849 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5850 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5851 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5852 777, 787, 821, 822, 823, 825
5854 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5858 * Support for RFC 3678. Real implementations exist only for Linux so far.
5859 Implemented by Ulrich Drepper.
5861 * nscd can now cache entries persistently. Expiring entries are reloaded.
5862 For speedups the cache can be shared in memory with client processes.
5863 Implemented by Ulrich Drepper.
5865 * nscd can now perform SELinux checks.
5866 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5868 * getaddrinfo queries are now cached. Canonical name lookup is performed
5870 Implemented by Ulrich Drepper.
5872 * The nothrow function attribute is used when headers are used by gcc when
5873 compiling C code. This can avoid significant amounts of exception
5876 * The malloc functions perform more error checking and are stricter when
5877 it comes to reacting on errors. The default action is to terminate
5878 the process after showing an error message. Implemented by Ulrich Drepper.
5880 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5881 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5883 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5884 namespaces using the new function dlmopen(). This feature is of course,
5885 like most other dynamic loading functionality, not available in statically
5886 linked applications. Implemented by Ulrich Drepper.
5888 * Low-overhead boundary checking variants of string and some stdio functions
5889 were added. These are to be used in conjunction with a gcc patch by
5890 Jakub Jelinek which adds calls to these functions if possible.
5891 Implemented by Jakub Jelinek and Ulrich Drepper.
5893 * Old code for several operating systems and machine architectures that
5894 have not been in working condition in a long time have been removed from
5895 the main source tree maintained by the GNU C Library's maintainers.
5896 These files are now reside in the separate `ports' source module
5897 that is usable as an add-on when building the library.
5901 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5902 interrogate the dynamic linker, compatible with the Solaris interface.
5904 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5905 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5907 * getifaddrs now uses the netlink interface on Linux to get its information.
5908 Implemented by Thorsten Kukuk.
5910 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5911 Implemented by Ulrich Drepper.
5913 * support for non-executable stacks on x86 has been added. Changes mostly
5916 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5919 * getaddrinfo now performs destination address selection according to
5924 * Thread-safe interfaces for many functions that access locale data
5925 were added in version 2.3, but these features were omitted from NEWS.
5926 Many functions have variants with an `_l' suffix that take a `locale_t'
5927 object as a parameter rather than consulting the current locale.
5928 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5929 create and maintain `locale_t' objects. Additionally, the new function
5930 `uselocale' sets "the current locale" (as used by functions not so
5931 parameterized) set for an individual thread. These features were added
5932 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5934 * The functions getresuid, getresgid, setresuid, and setresgid, which
5935 have long been available on Linux, are now declared in <unistd.h>
5936 and are now also available on the Hurd.
5938 * ELF thread-local storage support (TLS) now works on x86-64.
5940 * The new dynamic string token $LIB is expanded in shared library names.
5941 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5943 * Aldy Hernandez contributed complete software floating point support for
5944 PowerPC machines with no FPU.
5946 * fexecve is implemented on Linux.
5948 * The `btowc' function should work at least twice as fast due to
5949 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5951 * With approriate thread add-ons cancelable functions are now implemented
5952 in libc.so as well. No need to call the function in libpthread. This
5953 change allowed to finally disable the incorrect and expensive handling
5954 of weak definition in ld.so.
5956 * Yet more PLT entries in libc.so have been removed. We finally arrived
5957 at the bare minimum. Startup times improved appropriately.
5959 * Support for the new Linux/x86 system call interface was added. The
5960 AT_SYSINFO auxiliary vector entry is recognized and handled.
5964 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5967 * iconv (the program and the interface) now accepts empty names (excluding
5968 options like //TRANSLIT) to mean "use charset of current locale".
5970 * localedef can now transliterate characters in strings which are not in
5971 the provided charmap. The information from the input locale is used.
5973 * Prelinking support was added for ELF targets. This requires additional
5974 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5976 * Read-only stdio streams now use mmap to speed up operation by eliminating
5977 copying and buffer underflows. To use add 'm' to the mode string of
5978 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5980 * The malloc functions were completely rewritten by Wolfram Gloger based
5981 on Doug Lea's malloc-2.7.0.c.
5983 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5984 implementation of regex.
5986 * Bruno Haible upgraded the iconv and locale implementation to support
5989 * Contents of the LC_* and LANG environment variables in the CEN style are
5990 not recognized anymore. It never was used. Change by Ulrich Drepper.
5992 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5993 thread-local storage (TLS) ABI on some platforms.
5994 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5996 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5997 EUC-JISX0213, and TSCII.
5999 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6000 BSD-compatible interface for getting all network interface addresses.
6001 Implementation for IPv4 by Roland McGrath.
6003 * Loading of locale data is faster due to the introduction of a locale
6004 archive. Implemented by Roland McGrath and Ulrich Drepper.
6006 * Startup times are significantly reduced by not using exported functions
6007 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6010 * Steven Munroe contributed a port to PowerPC64/Linux.
6014 * The Hurd now uses the GNU libio implementation of stdio rather than the
6015 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6017 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6018 with the same behavior as the Linux system call of the same name.
6022 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6023 128-bit long double format.
6025 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6026 IBM1161, and IBM1162 charsets.
6028 * Andreas Jaeger contributed a port to x86-64/Linux.
6030 * Peter Bruin contributed a port to PowerPC/Hurd.
6032 * libc functions using I/O streams now can handle wide-oriented streams
6035 * optimizations in the dynamic linker. Binaries created by recent binutils
6036 versions start up quicker due to reduced time spent on relocations.
6038 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6042 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6043 asinh, atanh, j0 for the 128-bit long double format.
6045 * Bruno Haible updated all the code handling Unicode in some form to
6046 support Unicode 3.1.
6048 * Speed of regex for single-byte locales is back to previous levels.
6049 Patch by Isamu Hasegawa.
6051 * Alpha, SPARC, and IA-64 now also using floating stacks.
6053 * Startup time of internationalized applications greatly improved through
6054 iconv cache. Use iconvconfig to generate the cache file.
6055 Contributed by Ulrich Drepper.
6057 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6058 severe performance problems. Patch by David Mosberger.
6060 * The Hurd port got a lot more functionality like AIO, various stdio
6061 extensions, etc. Mainly done by Roland McGrath.
6063 * mtrace can now lookup symbols in shared libraries.
6067 * Intel's IA-64 math library is largely integrated. It provides fast and
6068 accurate implementatations for most basic and standard math functions
6069 in float, double, and long double format.
6071 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6072 and asin for the 96-bit long double format and asin, log, tan for the
6073 128-bit long double format.
6075 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6076 The basic double functions exist today. Contributed by Abraham Ziv
6077 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6078 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6080 * An asynchronous name lookup library was added. The interface is designed
6081 after POSIX AIO. The proposal was circulated beforehand to get comments.
6082 No negative ones came in. Implemented by Ulrich Drepper.
6084 * Port to S390/64bit contributed by Martin Schwidefsky
6085 <schwidefsky@de.ibm.com>.
6087 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6088 of functions for Linux/IA-64.
6090 * The RPC code is now thread safe. Threads can now use the same service
6091 of different services at the same time. Patch by Eric Norum
6092 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6094 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6095 family of functions for Linux/S390.
6097 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6098 of functions for Linux/x86.
6100 * Port to Linux/CRIS contributed by Axis Communications.
6104 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6105 we can now check for namespace violations and missing declarations. The
6106 result is that almost all headers are now Unix-compliant (as defined in
6107 the upcoming XPG6). The negative side is that some programs might need
6108 corrections, too, if they depend on the incorrect form of the headers in
6109 previous versions which defined too many symbols and included too many
6112 * regex now handles multibyte character sets correctly.
6113 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6115 * iconv (the program) does now conform to the upcoming XPG6 and handles
6116 charmaps. Instead of the charset names the path of charmaps can be
6117 provided and the conversion happens based on this data.
6118 Contributed by Ulrich Drepper.
6120 * The locale program now provides detailed information about the installed
6125 only lists the names of the supported locales
6129 provides details such as country, language, and codeset name.
6130 Contributed by Ulrich Drepper.
6134 * The gencat program now parses the input file according to the charset
6135 selected by the LC_CTYPE category. This is important for stateful
6136 character sets. To make generating catalogs easier there is a way
6137 to overwrite the charset selected by the locale: before the first
6138 message or $ quote line the catalog can contain a line like
6140 $ codeset=ISO-8859-2
6142 to select the charset (ISO-8859-2 in this case).
6144 Implemented by Shinya Hanataka and Ulrich Drepper.
6146 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6147 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6148 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6150 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6151 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6153 * The LANGUAGE environment variable is now ignored unless the locale is
6154 changed from the default "C" locale.
6156 * The usual bug fixes.
6160 * Greg McGary added runtime support for bounds checking using gcc's
6161 new -fbounded-pointers option. ix86 target is complete. PowerPC
6164 * Thorsten Kukuk added secure mode support to nscd.
6166 * The Berkeley db libraries have been removed.
6168 Related, the nss_db module is now in a separate package since it
6169 obviously requires a database library being available.
6171 * Wide character I/O streams implemented by Ulrich Drepper.
6173 * Functions from the extended socket API added by Ulrich Drepper.
6175 * Functions feenableexcept and fedisableexcept to control the
6176 behaviour of individual exceptions have been added by Andreas Jaeger.
6178 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6180 * The resolver code has been updated from bind 8.2.3-T5B which supports
6181 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6184 This change could in some situations effect backward compatibility. Since
6185 now `_res' is a thread-local instead of a global variable, modifying it
6186 in one thread does not have any effect in other threads.
6188 The resolver library was also extended to allow IPv6 as the transport
6189 protocol for the requests. This work was done by Stig Venaas.
6191 * Compatibility code for K&R C compilers has been removed from the
6192 header files. A ISO C compiler is needed to use the library
6193 (conforming to either C89 or C99 standard).
6195 * Complete rewrite of the localedef program to support multibyte character
6196 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6197 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6198 Implemented by Ulrich Drepper.
6200 Bruno Haible significantly improved the generation and use of the data
6201 structures for the wide character tables.
6203 * Plural handling in gettext implemented by Ulrich Drepper.
6205 * The utmp daemon has been removed.
6207 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6209 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6212 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6214 * POSIX barriers implemented by Kaz Kylheku.
6216 * POSIX spawn function family implemented by Ulrich Drepper.
6218 * POSIX spinlocks are now available.
6220 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6222 * the configure option --enable-kernel=X.Y.Z allows to strip out
6223 compatibility for kernel versions before X.Y.Z. This is currently only
6224 implemented for Linux.
6226 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6227 field sin6_scope_id. This means that all programs using IPv6 should be
6228 recompiled. Don't expect binary compatibility with previous glibc
6231 * various conversion modules for IBM character sets contributed by
6234 * IA-64 port by Jes Sorensen and HJ Lu.
6248 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6250 * New xdr functions are added; some rpc functions are now 64bit clean.
6252 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6254 * Fixed known incompatibilities with glibc 2.0.
6256 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6258 * Optimized a number of functions (especially the ELF dynamic loader).
6260 * Update timezone data files.
6262 * lots of charmaps corrections
6264 * some new locale definitions and charmaps
6269 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6270 conform to POSIX member type requirements. Symbol versions have been
6271 adjusted as needed within the library, and for direct use by applications,
6272 but there is potential for problems if third-party libraries use
6273 struct timeval as part of their interface. This does not present
6274 a problem for X and other "essential" system libraries.
6276 * An additional locale model to support C++ Standard Library locale
6277 model and probably more was implemented by Ulrich Drepper.
6279 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6282 * Miles Bader provided the `argp' function family to support hierachical
6283 command line argument parsing, layered on top of getopt.
6285 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6287 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6290 * scanf recognizes the %a and %A format for scanning floating point numbers.
6292 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6293 information and interfaces for the available integer types.
6295 * about 130 new math functions were added to implement the ISO C9x math
6298 * the new header <complex.h> contains definitions of the complex math
6299 functions from ISO C 9X.
6301 * the new header <tgmath.h> defines generic macros to use complex or
6302 real valued functions.
6304 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6306 * Andreas Jaeger provided a test suite for the math library.
6308 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6310 * Ulrich Drepper added character set conversion functions (iconv).
6312 * Optimized string functions have been added.
6314 * The localedata addon is now part of glibc.
6316 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6318 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6319 daemon for NSS (nscd).
6321 Missing a better place here are some numbers on improvements. Under
6322 Linux 2.1.125 un-tar-ing the kernel sources takes
6326 using local files 12.19s 6.88s 22.91s
6328 using NIS 13.92s 8.91s 26.34s
6330 using NIS & nscd 10.37s 7.34s 25.30s
6332 using NIS+ 27.57s 30.37s 640.46s
6334 using NIS+ & nscd 10.25s 7.83s 26.51s
6336 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6338 Keep in mind that non-namelookup related operations dominate above times.
6339 It was just a common complain that using NIS+ unpacking the kernel is
6342 [1] The old nscd implementation is not available anymore since it was
6343 distributed with glibc up to version 2.0.98 and thus is now replaced.
6345 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6347 * Mark Kettenis provided a Hesiod NSS module.
6349 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6350 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6352 * rcmd can now handle netgroups (Dick Streefland).
6354 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6357 * Support for the IPv6 protocol has been added to the socket API, as per the
6358 latest draft standards.
6360 * Support for Linux 2.2 has been added.
6362 * Interface changes relative to the latest 2.0.x release:
6363 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6364 addseverity NEW: Unix98
6365 alphasort64 NEW: LFS
6366 argp_err_exit_status NEW: argp, GNU ext
6367 argp_error NEW: argp, GNU ext
6368 argp_failure NEW: argp, GNU ext
6369 argp_help NEW: argp, GNU ext
6370 argp_parse NEW: argp, GNU ext
6371 argp_program_bug_address NEW: argp, GNU ext
6372 argp_program_version NEW: argp, GNU ext
6373 argp_program_version_hook NEW: argp, GNU ext
6374 argp_state_help NEW: argp, GNU ext
6375 argp_usage NEW: argp, GNU ext
6376 authdes_create NEW: Secure RPC
6377 authdes_getucred NEW: Secure RPC
6378 authdes_pk_create NEW: Secure RPC
6379 backtrace NEW: GNU ext.
6380 backtrace_symbols NEW: GNU ext.
6381 backtrace_symbols_fd NEW: GNU ext.
6383 cacosf NEW: ISO C 9x
6384 cacosh NEW: ISO C 9x
6385 cacoshf NEW: ISO C 9x
6386 cacoshl NEW: ISO C 9x
6387 cacosl NEW: ISO C 9x
6394 casinf NEW: ISO C 9x
6395 casinh NEW: ISO C 9x
6396 casinhf NEW: ISO C 9x
6397 casinhl NEW: ISO C 9x
6398 casinl NEW: ISO C 9x
6400 catanf NEW: ISO C 9x
6401 catanh NEW: ISO C 9x
6402 catanhf NEW: ISO C 9x
6403 catanhl NEW: ISO C 9x
6404 catanl NEW: ISO C 9x
6405 cbc_crypt NEW: Secure RPC
6409 ccoshf NEW: ISO C 9x
6410 ccoshl NEW: ISO C 9x
6416 cimagf NEW: ISO C 9x
6417 cimagl NEW: ISO C 9x
6418 clearerr_locked REMOVED
6419 clntunix_create NEW: sunrpc ext
6421 clog10 NEW: ISO C 9x
6422 clog10f NEW: ISO C 9x
6423 clog10l NEW: ISO C 9x
6433 cprojf NEW: ISO C 9x
6434 cprojl NEW: ISO C 9x
6436 crealf NEW: ISO C 9x
6437 creall NEW: ISO C 9x
6442 csinhf NEW: ISO C 9x
6443 csinhl NEW: ISO C 9x
6446 csqrtf NEW: ISO C 9x
6447 csqrtl NEW: ISO C 9x
6451 ctanhf NEW: ISO C 9x
6452 ctanhl NEW: ISO C 9x
6454 des_setparity NEW: Secure RPC
6455 ecb_crypt NEW: Secure RPC
6456 endutxent NEW: Unix98
6458 exp10f NEW: ISO C 9x
6459 exp10l NEW: ISO C 9x
6463 fattach NEW: STREAMS
6464 fdetach NEW: STREAMS
6468 feclearexcept NEW: ISO C 9x
6469 fegetenv NEW: ISO C 9x
6470 fegetexceptflag NEW: ISO C 9x
6471 fegetround NEW: ISO C 9x
6472 feholdexcept NEW: ISO C 9x
6474 feraiseexcept NEW: ISO C 9x
6475 ferror_locked REMOVED
6476 fesetenv NEW: ISO C 9x
6477 fesetexceptflag NEW: ISO C 9x
6478 fesetround NEW: ISO C 9x
6479 fetestexcept NEW: ISO C 9x
6480 feupdateenv NEW: ISO C 9x
6481 fflush_locked REMOVED
6485 fgets_unlocked NEW: GNU ext.
6486 fileno_locked REMOVED
6498 fputc_locked REMOVED
6499 fputs_unlocked NEW: GNU ext.
6500 fread_unlocked NEW: GNU ext.
6505 fstatvfs NEW: Unix98
6509 ftruncate64 NEW: LFS
6511 fwrite_unlocked NEW: GNU ext.
6512 gai_strerror NEW: IPv6
6516 getchar_locked REMOVED
6518 getdate_err NEW: Unix98
6519 getdate_r NEW: GNU ext.
6521 getnameinfo NEW: IPv6
6522 getnetname NEW: Secure RPC
6523 getpmsg NEW: STREAMS
6524 getpt NEW: Unix98 PTY
6525 getrlimit64 NEW: LFS
6526 getutxent NEW: Unix98
6527 getutxid NEW: Unix98
6528 getutxline NEW: Unix98
6529 glob64 NEW: GNU ext.
6530 globfree64 NEW: GNU ext.
6531 gnu_get_libc_release NEW: GNU ext.
6532 gnu_get_libc_version NEW: GNU ext.
6533 grantpt NEW: Unix98 PTY
6534 host2netname NEW: Secure RPC
6536 iconv_close NEW: iconv
6537 iconv_open NEW: iconv
6538 if_freenameindex NEW: IPv6
6539 if_indextoname NEW: IPv6
6540 if_nameindex NEW: IPv6
6541 if_nametoindex NEW: IPv6
6542 in6addr_any NEW: IPv6
6543 in6addr_loopback NEW: IPv6
6544 inet6_isipv4mapped NEW: IPv6
6545 isastream NEW: STREAMS
6546 iswblank NEW: GNU ext.
6547 key_decryptsession NEW: Secure RPC
6548 key_decryptsession_pk NEW: Secure RPC
6549 key_encryptsession NEW: Secure RPC
6550 key_encryptsession_pk NEW: Secure RPC
6551 key_gendes NEW: Secure RPC
6552 key_get_conv NEW: Secure RPC
6553 key_secretkey_is_set NEW: Secure RPC
6554 key_setnet NEW: Secure RPC
6555 key_setsecret NEW: Secure RPC
6556 llrint NEW: ISO C 9x
6557 llrintf NEW: ISO C 9x
6558 llrintl NEW: ISO C 9x
6559 llround NEW: ISO C 9x
6560 llroundf NEW: ISO C 9x
6561 llroundl NEW: ISO C 9x
6566 lrintf NEW: ISO C 9x
6567 lrintl NEW: ISO C 9x
6568 lround NEW: ISO C 9x
6569 lroundf NEW: ISO C 9x
6570 lroundl NEW: ISO C 9x
6572 makecontext NEW: Unix98
6573 mempcpy NEW: GNU ext.
6576 modify_ldt NEW: kernel
6580 nearbyint NEW: ISO C 9x
6581 nearbyintf NEW: ISO C 9x
6582 nearbyintl NEW: ISO C 9x
6583 netname2host NEW: Secure RPC
6584 netname2user NEW: Secure RPC
6585 nexttoward NEW: ISO C 9x
6586 nexttowardf NEW: ISO C 9x
6587 nexttowardl NEW: ISO C 9x
6591 passwd2des NEW: Secure RPC
6593 pow10f NEW: GNU ext.
6594 pow10l NEW: GNU ext.
6597 printf_size NEW: GNU ext.
6598 printf_size_info NEW: GNU ext.
6599 profil_counter REMOVED
6600 pthread_mutexattr_getkind_np REPLACED
6601 pthread_mutexattr_setkind_np REPLACED
6602 ptsname NEW: Unix98 PTY
6603 ptsname_r NEW: Unix98 PTY
6605 putchar_locked REMOVED
6606 putgrent NEW: GNU ext.
6608 putpmsg NEW: STREAMS
6609 pututxline NEW: Unix98
6613 readdir64_r NEW: LFS
6614 remquo NEW: ISO C 9x
6615 remquof NEW: ISO C 9x
6616 remquol NEW: ISO C 9x
6618 roundf NEW: ISO C 9x
6619 roundl NEW: ISO C 9x
6621 scalbln NEW: ISO C 9x
6622 scalblnf NEW: ISO C 9x
6623 scalblnl NEW: ISO C 9x
6625 sendfile NEW: kernel
6626 setcontext NEW: Unix98
6627 setrlimit64 NEW: LFS
6628 setutxent NEW: Unix98
6630 sigignore NEW: Unix98
6631 sigqueue NEW: POSIX.1b
6632 sigrelse NEW: Unix98
6633 sigset NEW: POSIX.1b
6634 sigtimedwait NEW: POSIX.1b
6635 sigwaitinfo NEW: POSIX.1b
6636 sincos NEW: GNU ext.
6637 sincosf NEW: GNU ext.
6638 sincosl NEW: GNU ext.
6642 strcasestr NEW: GNU ext.
6643 strtoimax NEW: ISO C 9x
6644 strtoumax NEW: ISO C 9x
6645 strverscmp NEW: GNU ext.
6646 svcauthdes_stats NEW: Secure RPC
6647 svcunix_create NEW: sunrpc etx
6648 svcunixfd_create NEW: sunrpc ext
6649 swapcontext NEW: Unix98
6650 tcgetsid NEW: Unix98 PTY
6651 tdestroy NEW: GNU ext.
6652 tgamma NEW: ISO C 9x
6653 tgammaf NEW: ISO C 9x
6654 tgammal NEW: ISO C 9x
6658 truncf NEW: ISO C 9x
6659 truncl NEW: ISO C 9x
6661 unlockpt NEW: Unix98 PTY
6662 updwtmpx NEW: Unix98
6663 user2netname NEW: Secure RPC
6664 utmpxname NEW: Unix98
6665 versionsort NEW: GNU ext.
6666 versionsort64 NEW: GNU ext.
6668 wcscasecmp NEW: GNU ext.
6669 wcsncasecmp NEW: GNU ext.
6670 wcsnlen NEW: GNU ext.
6671 wcstoimax NEW: ISO C 9x
6672 wcstoll NEW: ISO C 9x
6673 wcstoull NEW: ISO C 9x
6674 wcstoumax NEW: ISO C 9x
6676 wordexp NEW: POSIX.2
6677 wordfree NEW: POSIX.2
6678 write_profiling REMOVED
6679 xdecrypt NEW: Secure RPC
6680 xdr_authdes_cred NEW: Secure RPC
6681 xdr_authdes_verf NEW: Secure RPC
6682 xdr_cryptkeyarg NEW: Secure RPC
6683 xdr_cryptkeyarg2 NEW: Secure RPC
6684 xdr_cryptkeyres NEW: Secure RPC
6685 xdr_getcredres NEW: Secure RPC
6686 xdr_key_netstarg NEW: Secure RPC
6687 xdr_key_netstres NEW: Secure RPC
6688 xdr_keybuf NEW: Secure RPC
6689 xdr_keystatus NEW: Secure RPC
6690 xdr_netnamestr NEW: Secure RPC
6691 xdr_sizeof NEW: Secure RPC
6692 xdr_unixcred NEW: sunrpc ext
6693 xencrypt NEW: Secure RPC
6694 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6705 * inet_ntoa is thread-safe
6707 * updwtmp is moved from libutil to libc
6709 * rewrite of cbrt function
6711 * update of timezone data
6725 * add atoll function
6727 * fix complex problems in Berkeley DB code
6729 * fix math functions
6733 * fixed lots of header problems (especially Linux/GNU specific)
6735 * dynamic loader preserves all registers
6737 * Roland McGrath provided support for handling of auxiliary objects in
6738 the ELF dynamic loader.
6740 * support for parallel builds is improved
6744 * GNU extensions are no longer declared by default. To enable them you
6745 must define the macro `_GNU_SOURCE' in your program or compile with
6748 * The library has changed from using GNU ld symbol aliases to using weak
6749 symbols where available. The ELF object file format supports weak
6750 symbols; GNU ld also supports weak symbols in the a.out format. (There
6751 is also now support for other GNU ld extensions in ELF. Use the
6752 `--with-elf' option to configure to indicate you have ELF, and
6753 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6754 of many files which contained only symbol aliases, reducing the size of
6755 the source and the compiled library; many other files were renamed to
6756 less cryptic names previously occupied by the symbol alias files.
6757 There is a new header file <elf.h> for programs which operate on
6758 files in the ELF format.
6760 * Converted to Autoconf version 2, so `configure' has more options.
6761 Run `configure --help' to see the details.
6763 * The library can now be configured to build profiling, highly-optimized
6764 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6765 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6766 `configure' enable building these extra libraries. The shared library is
6767 built by default when using both ELF and GNU ld. When shared libraries
6768 are enabled, the new library `-ldl' is available for arbitrary run-time
6769 loading of shared objects; its interface is defined in <dlfcn.h>. The
6770 new header file <link.h> gives access to the internals of the run-time
6771 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6772 application of same name on other systems and it provides information
6773 about dynamically linked binaries.
6775 * The C library now provides the run-time support code for profiling
6776 executables compiled with `-pg'. Programs can control the profiling code
6777 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6778 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6779 the support for this file format was contributed by David Mosberger-Tang.
6781 * The math code has been replaced with a math library based on fdlibm from
6782 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6783 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6784 functions. The math functions now reside in a separate library, so
6785 programs using them will need to use `-lm' their linking commands.
6787 * John C. Bowman contributed optimized ix87 assembler inline functions.
6789 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6790 mechanism similar to that found in Solaris 2. This is now used for the
6791 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6792 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6793 file controls what services are used for each individual database. This
6794 works by loading shared libraries with names specified in `nsswitch.conf',
6795 so service modules can be changed or added at any time without even
6796 relinking any program. Currently there are the file, db, and NIS based
6797 NSS services available.
6799 * The new functions `strtoq' and `strtouq' parse integer values from
6800 strings, like `strtol' and `strtoul', but they return `long long int' and
6801 `unsigned long long int' values, respectively (64-bit quantities).
6803 * The new functions `strtof' and `strtold' parse floating-point values from
6804 strings, like `strtod', but they return `float' and `long double' values,
6805 respectively (on some machines `double' and `long double' are the same).
6807 * Ulrich Drepper has contributed new implementations of the floating-point
6808 printing and reading code used in the `printf' family of functions and
6809 `strtod', `strtof', and `strtold'. These new functions are perfectly
6810 accurate, and much faster than the old ones.
6812 * The implementation of the POSIX locale model was completely rewritten by
6813 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6814 to compile the POSIX locale definition.
6816 * The former dummy implementations of the strcoll and strxfrm function are
6817 now replaced by fully functional code contributed by Ulrich Drepper. The
6818 collation information comes from the POSIX locale definitions.
6820 * The new header <langinfo.h> defines an interface for accessing
6821 various locale-dependent data (using the locale chosen with `setlocale').
6823 * Ulrich Drepper has contributed a new suite of functions for operation on
6824 wide-character and multibyte-character strings, in <wchar.h>;
6825 and classification and case conversion of wide characters, in <wctype.h>.
6826 These new functions are conforming to the ISO C, Amendement 1 specification.
6828 * There is now a second implementation of the standard I/O library available.
6829 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6830 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6832 * You can now use positional parameter specifications in format strings
6833 for the `printf' and `scanf' families of functions. For example,
6834 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6835 ``Number 6, Mr Jones''. This is mainly useful when providing different
6836 format strings for different languages, whose grammars may dictate
6837 different orderings of the values being printed. To support this
6838 feature, the interface for `register_printf_handler' has changed; see
6839 the header file <printf.h> for details.
6841 * The `printf' and `scanf' families of functions now understand a new
6842 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6843 to group numbers as indicated by the locale; for `scanf' and friends, this
6844 says to accept as valid only a number with all the proper grouping
6845 separators in the right places. In the default "C" locale, numbers are
6846 not grouped; but locales for specific countries will define the usual
6847 conventions (i.e. separate thousands with `,' in the US locale).
6849 * The pgrp functions have been regularized, slightly incompatibly but much
6850 less confusingly. The core functions are now `getpgid' and `setpgid',
6851 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6852 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6853 provided for compatibility. There is no longer an incompatible `getpgrp'
6854 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6856 * The new header file <fts.h> and suite of functions simplify programs that
6857 operate on directory trees. This code comes from 4.4 BSD.
6859 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6860 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6861 NSS scheme used in glibc.
6863 * There is a new malloc debugging hook `__memalign_hook'.
6865 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6866 `unsigned int' in <sys/types.h>. These are for compatibility only and
6867 their use is discouraged.
6869 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6870 done differently, so that it works even without GNU ld.
6872 * New function `euidaccess' checks allowed access to a file like `access',
6873 but using the effective IDs instead of the real IDs.
6875 * The time zone data files have been updated for the latest and greatest
6876 local time conventions of the countries of the world.
6878 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6881 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6882 for formatting floating-point numbers. They are provided only for
6883 compatibility; new programs should use `sprintf' instead. There are
6884 also equivalent function for the `long double' floating-point type and
6885 all functions also exist in a reentrant form.
6887 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6888 functions for maintaining the login-record files (primarily of use to
6889 system programs such as `login'), and convenient functions for
6890 allocating and initializing a pseudo-terminal (pty) device.
6892 * Ulrich Drepper has contributed new support for System V style
6893 shared memory and IPC on systems that support it.
6895 * Ulrich Drepper has contributed several miscellaneous new functions found
6896 in System V: The `hsearch' family of functions provide an effective
6897 implementation of hash tables; `a64l' and `l64a' provide a very simple
6898 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6901 * Ulrich Drepper has contributed new reentrant counterparts for the
6902 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6904 * Ulrich Drepper has contributed new, highly-optimized versions of several
6905 string functions for the i486/Pentium family of processors.
6907 * Ulrich Drepper has updated the Linux-specific code, based largely
6908 on work done in Hongjiu Lu's version of GNU libc for Linux.
6909 The GNU library now supports Linux versions 2.0.10 and later,
6910 using the ELF object file format (i[3456]86-*-linux).
6912 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6914 * David Mosberger-Tang and Richard Henderson have ported the C library
6915 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6916 dynamic linking support for ELF/Alpha.
6918 * Richard Henderson contributed several Alpha optimized assembler function
6919 for arithmetic and string handling.
6921 * Ulrich Drepper has contributed a new set of message catalog functions to
6922 support multiple languages using the <libintl.h> interface, for use with
6923 his new package GNU gettext. Translation volunteers have contributed
6924 catalogs of the library's messages in Spanish, German, and Korean.
6926 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6927 program and the `catgets' function for reading the catalog files it
6928 creates. (The <libintl.h> interface is preferred; we include the
6929 <nl_types.h> interface using `catgets' only for source compatibility with
6930 programs already written to use it.)
6932 * New header file <values.h> gives SVID-compatible names for <limits.h>
6935 * Various new macros, declarations, and small header files for compatibility
6938 * New function `group_member' is a convenient way to check if a process has
6939 a given effective group ID.
6941 * When using GCC 2.7 and later, the socket functions are now declared in a
6942 special way so that passing an argument of type `struct sockaddr_in *',
6943 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6944 `struct sockaddr *' type, does not generate a type-clash warning.
6946 * New function `error' declared in header file <error.h> is a convenient
6947 function for printing error messages and optionally exiting; this is the
6948 canonical function used in GNU programs. The new functions `err', `warn',
6949 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6950 doing the same thing.
6952 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6953 POSIX.2 `glob' function to do ~ and {...} expansion.
6955 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6956 `clearenv' which is used in POSIX.9 is also available.
6958 * New function `getsid' returns session ID number on systems that support it.
6960 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6961 files <db.h> and <mpool.h> provide a rich set of functions for several
6962 types of simple databases stored in memory and in files, and <ndbm.h> is
6963 an old `ndbm'-compatible interface using the `db' functions. Link with
6964 `-ldb' to get these functions.
6966 * New macro `strdupa' copies a string like `strdup', but uses local stack
6967 space from `alloca' instead of dynamic heap space from `malloc'.
6969 * New function `strnlen' is like `strlen' but searches only a given maximum
6970 number of characters for the null terminator. `stpncpy', `strndup' and
6971 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6974 * New function `statfs' in header <sys/statfs.h>.
6976 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6977 provide convenient functions for operating on blocks of null-terminated
6980 * A new suite of functions in <utmp.h> handle all the details of reading
6981 and writing the utmp file.
6983 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6986 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6987 completely POSIX compliant and also implemented the extended functionality
6988 to handle alternate digit representation and alternate era date formats.
6990 * Ulrich Drepper provided an implementation of the `strptime' function
6991 defined in XPG4.2 which transforms a string into a `struct tm' value.
6993 * Paul Eggert provided the tzselect shell script as part of the timezone
6994 code. The shell script makes it easy to select the correct timezone
6997 * The implementation of the malloc family of functions is completely replaced
6998 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6999 The implementation uses the mmap function (if available) and it is
7000 optimized for the use in multi threaded programs.
7002 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7003 functions. This new functionality is usable by specifying a special
7004 salt string and it is compatible with implementation on *BSD systems.
7006 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7007 `getsubopt' to handle second level command line options, `bsd_signal'
7008 to access BSD style `signal' functionality, the obsolete `regexp' style
7011 * the `lchown' function is available on system which support this
7014 * The implementation of the shadow password handling function was contributed
7017 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7019 * POSIX.1g support was added. The <sys/select.h> header is available,
7020 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7021 implementation of `getaddrinfo'.
7025 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7027 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7028 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7030 * The new function `daemon' from 4.4 BSD is useful for server programs that
7031 want to put themselves in the background.
7033 * Joel Sherrill has contributed support for several standalone boards that
7034 run without an operating system.
7036 * `printf', `scanf' and friends now accept a `q' type modifier for long
7037 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7039 * All of the code taken from BSD (notably most of the math and networking
7040 routines) has been updated from the BSD 4.4-Lite release.
7042 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7044 * The new functions `getdomainname' and `setdomainname' fetch or change the
7045 YP/NIS domain name. These are system calls which exist on systems which
7048 * The time zone data files have been updated for the latest international
7051 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7052 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7056 * The C library now includes support for Sun RPC, from Sun's free
7057 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7058 are included. (There is still no support for YP.)
7060 * Tom Quinn has contributed a port of the C library to SGI machines running
7061 Irix 4 (mips-sgi-irix4).
7063 * The new `lockf' function is a simplified interface to the locking
7064 facilities of `fcntl', included for compatibility.
7066 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7068 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7070 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7073 * The error message printed by `assert' for a failed assertion now includes
7074 the name of the program (if using GNU ld) and the name of the calling
7075 function (with versions of GCC that support this).
7077 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7079 * The library now includes the <sys/mman.h> header file and memory
7080 management functions `mmap', `munmap', `mprotect', `msync', and
7081 `madvise', on systems that support those facilities.
7083 * The interface for `mcheck' has changed slightly: the function called to
7084 abort the program when an allocation inconsistency is detected now takes
7085 an argument that indicates the type of failure. The new function
7086 `mprobe' lets you request a consistency check for a particular block at
7087 any time (checks are normally done only when you call `free' or `realloc'
7090 * It is now possible to easily cross-compile the C library, building on one
7091 system a library to run on another machine and/or operating system. All
7092 you need to do is set the variable `HOST_CC' in `configparms' to the
7093 native compiler for programs to run on the machine you are building on (a
7094 few generator programs are used on Unix systems); set `CC' to the
7097 * The new function `fexecve' (only implemented on the GNU system) executes
7098 a program file given a file descriptor already open on the file.
7102 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7103 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7105 * You can set the variable `libprefix' in `configparms' to specify a prefix
7106 to be prepended to installed library files; this makes it easy to install
7107 the GNU C library to be linked as `-lgnuc' or whatever.
7109 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7110 copies a limited number of characters from a string, and returns the
7111 address of the last character written.
7113 * You no longer need to check for whether the installed `stddef.h' is
7114 compatible with the GNU C library. configure now checks for you.
7116 * You can now define a per-stream `fileno' function to convert the
7117 stream's cookie into an integral file descriptor.
7119 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7120 allocates zero bytes of storage, and returns a unique pointer which
7121 you can pass to `realloc' or `free'. The behavior is undefined if
7122 you dereference this pointer.
7124 * The C library now runs on Sony NEWS m68k machines running either
7125 NewsOS 3 or NewsOS 4.
7127 * The new `syscall' function is a system-dependent primitive function
7128 for invoking system calls. It has the canonical behavior on Unix
7129 systems, including unreliable return values for some calls (such as
7130 `pipe', `fork' and `getppid').
7132 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7133 to `EAGAIN', which is the preferred name. On systems whose kernels
7134 use two distinct codes, the C library now translates EWOULDBLOCK to
7135 EAGAIN in every system call function.
7139 * The GNU C Library Reference Manual is now distributed with the library.
7140 `make dvi' will produce a DVI file of the printed manual.
7141 `make info' will produce Info files that you can read on line using C-h i
7142 in Emacs or the `info' program.
7143 Please send comments on the manual to bug-glibc-manual@gnu.org.
7145 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7147 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7149 * Jason Merrill has contributed a port to the Sequent Symmetry running
7150 Dynix version 3 (i386-sequent-dynix).
7152 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7153 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7155 * New function `memory_warnings' lets you arrange to get warnings when
7156 malloc is running out of memory to allocate, like Emacs gives you.
7158 * The C library now contains the relocating allocator used in Emacs 19 for
7159 its editing buffers. This allocator (ralloc) minimizes allocation
7160 overhead and fragmentation by moving allocated regions around whenever it
7161 needs to. You always refer to a ralloc'd region with a "handle" (a
7162 pointer to a pointer--an object of type `void **').
7164 * There is a new `printf' format: `%m' gives you the string corresponding
7165 to the error code in `errno'.
7167 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7168 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7169 pass, the `a' modifier says to fill in a `char **' you pass with a
7172 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7173 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7174 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7176 * `mkstemp' is a traditional Unix function to atomically create and open a
7177 uniquely-named temporary file.
7181 * The standard location for the file that says what the local timezone is
7182 has changed again. It is now `/usr/local/etc/localtime' (or more
7183 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7185 * The distribution no longer contains any files with names longer than 14
7188 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7189 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7191 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7195 * The configuration process has changed quite a bit. The `configure'
7196 script is now used just like the configuration scripts for other GNU
7197 packages. The `sysdeps' directory hierarchy is much rearranged.
7198 The file `INSTALL' explains the new scheme in detail.
7200 * The header files no longer need to be processed into ANSI C and
7201 traditional C versions. There is just one set of files to install, and
7202 it will work with ANSI or old C compilers (including `gcc -traditional').
7204 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7205 MIPS DECStation running Ultrix 4.
7207 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7208 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7209 made itself into a shared library.
7211 * Yet further improved support for the i386, running 4.3 BSD-like systems
7212 (such as Mach 3 with the Unix single-server), or System V.
7214 * New function `strncasecmp' to do case-insensitive string comparison
7215 with limited length.
7217 * New function `strsep' is a reentrant alternative to `strtok'.
7219 * New functions `scandir' and `alphasort' for searching directories.
7221 * New function `setenv' is a better interface to `putenv'.
7223 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7224 function for traversing a directory tree.
7226 * The GNU obstack package is now also part of the C library.
7227 The new function `open_obstack_stream' creates a stdio stream that
7228 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7229 formatted output directly to an obstack.
7231 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7232 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7234 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7236 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7237 things to your strings.
7239 * There are some new test programs: test-fseek, testmb, and testrand.
7241 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7242 These ports are not finished, but are a good starting place for really
7243 supporting those systems.
7245 * `/etc/localtime' is now the standard location for the file that says what
7246 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7247 This follows the general principle that `/etc' is the place for all local
7248 configuration files.
7250 * The C library header files now use `extern "C"' when used by the C++
7251 compiler, so the C library should now work with C++ code.
7253 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7254 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7257 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7258 function which uses the `merge sort' algorithm, and is said to be
7259 significantly faster than the old GNU `qsort' function. Merge sort is
7260 now the standard `qsort' function. The new algorithm can require a lot
7261 of temporary storage; so, the old sorting function is called when the
7262 required storage is not available.
7264 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7265 provides the Unix `crypt' function, plus some other entry points.
7267 * The code and header files taken from 4.4 BSD have been updated with the
7268 latest files released from Berkeley.
7270 ----------------------------------------------------------------------
7273 Permission is granted to anyone to make or distribute verbatim copies
7274 of this document as received, in any medium, provided that the
7275 copyright notice and this permission notice are preserved,
7276 thus giving the recipient permission to redistribute in turn.
7278 Permission is granted to distribute modified versions
7279 of this document, or of portions of it,
7280 under the above conditions, provided also that they
7281 carry prominent notices stating who last changed them.
7284 version-control: never