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 * Support for DT_RELR relative relocation format has been added to
13 glibc. This is a new ELF dynamic tag that improves the size of
14 relative relocations in shared object files and position independent
15 executables (PIE). DT_RELR generation requires linker support for
16 -z pack-relative-relocs option, which is supported for some targets
17 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
19 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
20 have been added. The pidfd functionality provides access to a process
21 while avoiding the issue of PID reuse on tranditional Unix systems.
23 * On Linux, the process_madvise function has been added. It has the
24 same functionality as madvise but alters the target process identified
27 * On Linux, the process_mrelease function has been added. It allows a
28 caller to release the memory of a dying process. The release of the
29 memory is carried out in the context of the caller, using the caller's
30 CPU affinity, and priority with CPU usage accounted to the caller.
32 * The “no-aaaa” DNS stub resolver option has been added. System
33 administrators can use it to suppress AAAA queries made by the stub
34 resolver, including AAAA lookups triggered by NSS-based interfaces
35 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
36 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
37 produce IPv6 addresses, and configured IPv6 name servers are still
38 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
39 are translated to A queries. The new resolver option is intended
40 primarily for diagnostic purposes, to rule out that AAAA DNS queries
41 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
42 validation by applications.
44 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
45 and mount_setattr have been added. They are part of the new Linux kernel
46 mount APIs that allow applications to more flexibly configure and operate
47 on filesystem mounts. The new mount APIs are specifically designed to work
50 * localedef now accepts locale definition files encoded in UTF-8.
51 Previously, input bytes not within the ASCII range resulted in
54 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
55 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
56 Support for the char8_t typedef has been added per the ISO C2X N2653
57 proposal. The functions are declared in uchar.h in C2X mode or when the
58 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
59 The char8_t typedef is declared in uchar.h in C2X mode or when the
60 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
61 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
63 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
64 added. The functions wrap getrandom and/or /dev/urandom to return high-
65 quality randomness from the kernel.
67 * Support for LoongArch running on Linux has been added. This port requires
68 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
71 - loongarch64-linux-gnu
73 The LoongArch ABI is 64-bit little-endian.
75 Deprecated and removed features, and other changes affecting compatibility:
77 * Support for prelink will be removed in the next release; this includes
78 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
79 variables and their functionality in the dynamic loader.
81 * The Linux kernel version check has been removed along with the
82 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
83 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
84 when libc.so is issued directly.
86 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
88 Changes to build and runtime requirements:
90 [Add changes to build and runtime requirements here]
92 Security related changes:
94 [Add security related changes here]
96 The following bugs are resolved with this release:
98 [The release manager will add the list generated by
99 scripts/list-fixed-bugs.py just before the release.]
106 * Unicode 14.0.0 Support: Character encoding, character type info, and
107 transliteration tables are all updated to Unicode 14.0.0, using
108 generator scripts contributed by Mike FABIAN (Red Hat).
110 * Bump r_version in the debugger interface to 2 and add a new field,
111 r_next, support multiple namespaces.
113 * Support for the C.UTF-8 locale has been added to glibc. The locale
114 supports full code-point sorting for all valid Unicode code points. A
115 limitation in the framework for fnmatch, regexec, and regcomp requires
116 a compromise to save space and only ASCII-based range expressions are
117 supported for now (see bug 28255). The full size of the locale is
118 only ~400KiB, with 346KiB coming from LC_CTYPE information for
119 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
120 in various downstream distributions. The locale is not built into
121 glibc, and must be installed.
123 * <math.h> functions that round their results to a narrower type, and
124 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
125 18661-3:2015 and draft ISO C2X:
127 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
128 fMxsqrtfN and fMxsqrtfNx functions.
130 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
133 * <math.h> functions for floating-point maximum and minimum,
134 corresponding to new operations in IEEE 754-2019, and corresponding
135 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
136 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
137 fminimum_mag, fminimum_mag_num and corresponding functions for float,
138 long double, _FloatN and _FloatNx.
140 * <math.h> macros for single-precision float constants are added as a
141 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
142 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
145 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
146 predefined as specified in TS 18661-1:2014.
148 * The exp10 functions in <math.h> now have a corresponding type-generic
151 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
153 * printf-family functions now support the %b format for output of
154 integers in binary, as specified in draft ISO C2X, and the %B variant
155 of that format recommended by draft ISO C2X.
157 * A new DSO sorting algorithm has been added in the dynamic linker that uses
158 topological sorting by depth-first search (DFS), solving performance issues
159 of the existing sorting algorithm when encountering particular circular
160 object dependency cases.
162 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
163 the two DSO sorting algorithms. The default setting of '2' uses the
164 new DFS-based algorithm. The setting '1' switches to the old
165 algorithm used in glibc 2.33 and earlier.
167 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
168 to be used by compilers for optimizing usage of 'memcmp' when its
169 return value is only used for its boolean status.
171 * Support for automatically registering threads with the Linux rseq
172 system call has been added. This system call is implemented starting
173 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
174 operations on per-cpu data. It allows user-space to perform updates
175 on per-cpu data without requiring heavy-weight atomic operations.
176 Automatically registering threads allows all libraries, including
177 libc, to make immediate use of the rseq support by using the
178 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
179 variables. The GNU C Library manual has details on integration of
180 Restartable Sequences.
182 * A symbolic link to the dynamic linker is now installed under
183 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
185 * All programs and the testsuite in glibc are now built as position independent
186 executables (PIE) by default on toolchains and architectures that support it.
187 Further, if the toolchain and architecture supports it, even static programs
188 are built as PIE and the resultant glibc can be used to build static PIE
189 executables. A new option --disable-default-pie has been added to disable
190 this behavior and get a non-PIE build. This option replaces
191 --enable-static-pie, which no longer has any effect on the build
194 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
195 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
196 or to use huge pages directly with mmap calls with the MAP_HUGETLB
197 flags). The former can improve performance when Transparent Huge Pages
198 is set to 'madvise' mode while the latter uses the system reserved
201 * The printf family of functions now handles the flagged %#m conversion
202 specifier, printing errno as an error constant (similar to strerrorname_np).
204 * The function _dl_find_object has been added. In-process unwinders
205 can use it to efficiently locate unwinding information for a code
208 * Support for OpenRISC running on Linux has been added. This port requires
209 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
214 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
215 64-bit file offsets (LFS default).
217 * A new configure option, --with-rtld-early-cflags, can be used to
218 specify additional compiler flags for building the early startup code
219 of the dynamic linker. On targets which have CPU compatibility
220 checks, this can help to ensure that proper diagnostics are printed if
221 the dynamic loader runs on an incompatible CPU.
223 * On Linux, the epoll_pwait2 function has been added. It is similar to
224 epoll_wait with the difference the timeout has nanoseconds resolution.
226 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
227 enabling posix_spawn and posix_spawnp to set the controlling terminal in
228 the new process in a race free manner. This function is a GNU extension.
230 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
231 applications compiling with glibc and gcc 12 and later. Level 3 leverages
232 the __builtin_dynamic_object_size function to deliver additional
233 fortification balanced against additional runtime cost (checking non-constant
236 * The audit libraries will avoid unnecessary slowdown if it is not required
237 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
239 Deprecated and removed features, and other changes affecting compatibility:
241 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
242 has been removed since the first PT_LOAD segment is no longer executable
243 due to defaulting to -z separate-code.
245 * The r_version update in the debugger interface makes the glibc binary
246 incompatible with GDB binaries built without the following commits:
248 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
249 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
251 when audit modules or dlmopen are used.
253 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
255 * The --enable-static-pie option is no longer available. The glibc build
256 configuration script now automatically detects static-pie support in the
257 toolchain and architecture and enables it if available.
259 * The catchsegv script and associated libSegFault.so shared object have
260 been removed. There are widely-deployed out-of-process alternatives for
261 catching coredumps and backtraces.
263 * Support for prelink will be removed in the next release; this includes
264 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
265 variables and their functionality in the dynamic loader.
267 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
268 functionality to obtain the program mapping address can be achieved by
269 using LD_TRACE_LOADED_OBJECTS to value of 2.
271 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
272 support prelink PIE binaries.
274 Changes to build and runtime requirements:
276 * The audit module interface version LAV_CURRENT is increased to enable
277 proper bind-now support. The loader now advertises via the la_symbind
278 flags that PLT trace is not possible. New audit modules require the
279 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
280 modules are still loaded for all targets except aarch64.
282 * The audit interface on aarch64 is extended to support both the indirect
283 result location register (x8) and NEON Q register. Old audit modules are
284 rejected by the loader. Audit modules must be rebuilt to use the newer
285 structure sizes and the latest module interface version for LAV_CURRENT.
287 Security related changes:
289 CVE-2022-23219: Passing an overlong file name to the clnt_create
290 legacy function could result in a stack-based buffer overflow when
291 using the "unix" protocol. Reported by Martin Sebor.
293 CVE-2022-23218: Passing an overlong file name to the svcunix_create
294 legacy function could result in a stack-based buffer overflow.
296 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
297 function could result in a memory leak and potential access of
298 uninitialized memory. Reported by Qualys.
300 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
301 function may result in an off-by-one buffer underflow and overflow
302 when the current working directory is longer than PATH_MAX and also
303 corresponds to the / directory through an unprivileged mount
304 namespace. Reported by Qualys.
306 The following bugs are resolved with this release:
308 [12889] nptl: Race condition in pthread_kill
309 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
310 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
311 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
313 [15333] libc: Use 64-bit stat functions in installed programs
314 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
316 [15971] dynamic-link: No interface for debugger access to libraries
318 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
319 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
320 deeply nested DSO dependencies.
321 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
322 ID whose lifetime has not ended
323 [22542] network: buffer overflow in sunrpc clnt_create
325 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
327 [25947] malloc: memory leak in muntrace
328 [26045] math: fmaxf(inf, nan) does not always work
329 [26108] math: exp10() has problems with <tgmath.h>
330 [26779] build: benign use after realloc at localealias.c:329
331 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
332 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
333 [27945] build: build-many-glibcs.py doesn't configure GCC with
334 --enable-initfini-array
335 [27991] build: x86: sysdeps/x86/configure.ac breaks when
336 libc_cv_include_x86_isa_level is loaded from cache
337 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
338 in __REDIRECT_NTH macro
339 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
340 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
342 [28126] libc: nftw aborts for paths longer than PATH_MAX
343 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
344 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
346 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
347 [28185] math: Inaccurate j0f function (again)
348 [28199] locale: iconvconfig prefix flag behaves differently in glibc
350 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
351 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
353 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
354 [28223] libc: mips: clone does not align stack
355 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
357 [28256] malloc: Conditional jump or move depends on uninitialised
358 value(s) in __GI___tunables_init
359 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
360 spawn5 fail if stray fds are open
361 [28310] libc: Do not use affinity mask for sysconf
362 (_SC_NPROCESSORS_CONF)
363 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
365 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
367 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
368 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
370 [28353] network: Race condition on __opensock
371 [28357] dynamic-link: deadlock between pthread_create and ctors
372 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
373 [28361] nptl: Fix for bug 12889 causes setxid deadlock
374 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
375 [28390] localedata: Update locale data to Unicode 14.0.0
376 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
378 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
380 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
381 to tgkill (getpid (), gettid())
382 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
383 [28457] dynamic-link: Missing reldepmod4.so dependency for
385 [28469] time: linux: struct timex is not correctly set for 32-bit
386 systems with TIMESIZE=64
387 [28470] regex: Buffer read overrun in regular expression searching
388 [28475] string: Incorrect access attribute on memfrob
389 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
390 spurious NUL character on state reset
391 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
393 [28550] dynamic-link: FAIL: tst-dso-
394 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
396 [28554] build: Undefined generate-md5
397 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
399 [28607] nptl: Masked signals are delivered on thread exit
400 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
401 lack of cpu counting /proc fallback with glibc 2.34
402 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
403 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
404 [28648] dynamic-link: Running ld.so on statically linked binaries
406 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
408 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
409 [28678] nptl: nptl/tst-create1 hangs sporadically
410 [28688] dynamic-link: PT_LOAD p_align check is too strict
411 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
413 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
414 timezones generated by tzcode-2021d and later
415 [28713] math: GCC 12 miscompiles libm
416 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
417 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
418 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
419 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
420 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
421 Assertion `GL(dl_rtld_map).l_libname' failed!
422 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
423 [28757] nptl: GDB printer tests failed with new GDB
424 [28765] math: x86_64 libmvec atan2 accuracy
425 [28766] manual: Document libmvec accuracy
426 [28768] network: Buffer overflow in svcunix_create with long pathnames
428 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
430 [28770] libc: Unexpected return value from realpath() for too long
431 results (CVE-2021-3998)
432 [28771] libc: %ebx optimization macros are incompatible with .altmacro
434 [28780] build: --disable-default-pie doesn't work on static programs
435 [28782] libc: x86-64 ISA level for glibc itself is always
437 [28792] glob: possible wrong behaviour with patterns with double [
439 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
440 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
441 empty mon_decimal_point_wc
448 * In order to support smoother in-place-upgrades and to simplify
449 the implementation of the runtime all functionality formerly
450 implemented in the libraries libpthread, libdl, libutil, libanl has
451 been integrated into libc. New applications do not need to link with
452 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
453 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
454 provided, so that the linker options keep working. Applications which
455 have been linked against glibc 2.33 or earlier continue to load the
456 corresponding shared objects (which are now empty). The integration
457 of those libraries into libc means that additional symbols become
458 available by default. This can cause applications that contain weak
459 references to take unexpected code paths that would only have been
460 used in previous glibc versions when e.g. preloading libpthread.so.0,
461 potentially exposing application bugs.
463 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
464 PTHREAD_STACK_MIN is no longer constant and is redefined to
465 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
466 sets for modern architectural features like Arm SVE.
468 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
469 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
470 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
471 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
472 dynamic sized register sets for modern architectural features like
475 * The dynamic linker implements the --list-diagnostics option, printing
476 a dump of information related to IFUNC resolver operation and
477 glibc-hwcaps subdirectory selection.
479 * On Linux, the function execveat has been added. It operates similar to
480 execve and it is is already used to implement fexecve without requiring
481 /proc to be mounted. However, different than fexecve, if the syscall is not
482 supported by the kernel an error is returned instead of trying a fallback.
484 * The ISO C2X function timespec_getres has been added.
486 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
487 C2X, is supported to enable declarations of functions defined in Annex F
488 of C2X. Those declarations are also enabled when
489 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
490 defined, and when _GNU_SOURCE is defined.
492 * On powerpc64*, glibc can now be compiled without scv support using the
493 --disable-scv configure option.
495 * Add support for 64-bit time_t on configurations like x86 where time_t
496 is traditionally 32-bit. Although time_t still defaults to 32-bit on
497 these configurations, this default may change in future versions.
498 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
499 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
500 only enabled for Linux and the full support requires a minimum kernel
503 * The main gconv-modules file in glibc now contains only a small set of
504 essential converter modules and the rest have been moved into a supplementary
505 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
506 in the same GCONV_PATH. Similarly, external converter modules directories
507 may have supplementary configuration files in a gconv-modules.d directory
508 with names ending with .conf to logically classify the converter modules in
511 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
512 to configure the size of the thread stack cache.
514 * The function _Fork has been added as an async-signal-safe fork replacement
515 since Austin Group issue 62 droped the async-signal-safe requirement for
516 fork (and it will be included in the future POSIX standard). The new _Fork
517 function does not run any atfork function neither resets any internal state
518 or lock (such as the malloc one), and only sets up a minimal state required
519 to call async-signal-safe functions (such as raise or execve). This function
520 is currently a GNU extension.
522 * On Linux, the close_range function has been added. It allows efficiently
523 closing a range of file descriptors on recent kernels (version 5.9).
525 * The function closefrom has been added. It closes all file descriptors
526 greater than or equal to a given integer. This function is a GNU extension,
527 although it is also present in other systems.
529 * The posix_spawn_file_actions_addclosefrom_np function has been added,
530 enabling posix_spawn and posix_spawnp to close all file descriptors greater
531 than or equal to a given integer. This function is a GNU extension,
532 although Solaris also provides a similar function.
534 * When invoked explicitly, the dynamic linker now uses the kernel to
535 execute programs that do not have any dynamic dependency (that is,
536 they are statically linked). This feature is Linux-specific.
538 Deprecated and removed features, and other changes affecting compatibility:
540 * The function pthread_mutex_consistent_np has been deprecated; programs
541 should use the equivalent standard function pthread_mutex_consistent
544 * The function pthread_mutexattr_getrobust_np has been deprecated;
545 programs should use the equivalent standard function
546 pthread_mutexattr_getrobust instead.
548 * The function pthread_mutexattr_setrobust_np has been deprecated;
549 programs should use the equivalent standard function
550 pthread_mutexattr_setrobust instead.
552 * The function pthread_yield has been deprecated; programs should use
553 the equivalent standard function sched_yield instead.
555 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
557 * Various rarely-used functions declared in <resolv.h> and
558 <arpa/nameser.h> have been deprecated. Applications are encouraged to
559 use dedicated DNS processing libraries if applicable. For <resolv.h>,
560 this affects the functions dn_count_labels, fp_nquery, fp_query,
561 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
562 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
563 p_type, putlong, putshort, res_hostalias, res_isourserver,
564 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
565 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
566 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
567 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
569 * Various symbols previously defined in libresolv have been moved to libc
570 in order to prepare for libresolv moving entirely into libc (see earlier
571 entry for merging libraries into libc). The symbols __dn_comp,
572 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
573 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
574 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
575 __res_search, __res_send formerly in libresolv have been renamed and no
576 longer have a __ prefix. They are now available in libc.
578 * The pthread cancellation handler is now installed with SA_RESTART and
579 pthread_cancel will always send the internal SIGCANCEL on a cancellation
580 request. It should not be visible to applications since the cancellation
581 handler should either act upon cancellation (if asynchronous cancellation
582 is enabled) or ignore the cancellation internal signal. However there are
583 buggy kernel interfaces (for instance some CIFS versions) that could still
584 see a spurious EINTR error when cancellation interrupts a blocking syscall.
586 * Previously, glibc installed its various shared objects under versioned
587 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
588 were provided as symbolic links. Starting with glibc 2.34, the shared
589 objects are installed under their ABI sonames directly, without
590 symbolic links. This increases compatibility with distribution
591 package managers that delete removed files late during the package
592 upgrade or downgrade process.
594 * The symbols mallwatch and tr_break are now deprecated and no longer used in
595 mtrace. Similar functionality can be achieved by using conditional
596 breakpoints within mtrace functions from within gdb.
598 * The __morecore and __after_morecore_hook malloc hooks and the default
599 implementation __default_morecore have been removed from the API. Existing
600 applications will continue to link against these symbols but the interfaces
601 no longer have any effect on malloc.
603 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
604 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
605 disabled by default in the main C library. Users looking to use these
606 features now need to preload a new debugging DSO libc_malloc_debug.so to get
607 this functionality back.
609 * The deprecated functions malloc_get_state and malloc_set_state have been
610 moved from the core C library into libc_malloc_debug.so. Legacy applications
611 that still use these functions will now need to preload libc_malloc_debug.so
612 in their environment using the LD_PRELOAD environment variable.
614 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
615 __memalign_hook and __free_hook are now removed from the API. Compatibility
616 symbols are present to support legacy programs but new applications can no
617 longer link to these symbols. These hooks no longer have any effect on glibc
618 functionality. The malloc debugging DSO libc_malloc_debug.so currently
619 supports hooks and can be preloaded to get this functionality back for older
620 programs. However this is a transitional measure and may be removed in a
621 future release of the GNU C Library. Users may port away from these hooks by
622 writing and preloading their own malloc interposition library.
624 Changes to build and runtime requirements:
626 * On Linux, the shm_open, sem_open, and related functions now expect the
627 file shared memory file system to be mounted at /dev/shm. These functions
628 no longer search among the system's mount points for a suitable
629 replacement if /dev/shm is not available.
631 Security related changes:
633 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
634 a request for netgroup lookup, may crash due to a double-free,
635 potentially resulting in degraded service or Denial of Service on the
636 local system. Reported by Chris Schanzle.
638 CVE-2021-33574: The mq_notify function has a potential use-after-free
639 issue when using a notification type of SIGEV_THREAD and a thread
640 attribute with a non-default affinity mask.
642 CVE-2021-35942: The wordexp function may overflow the positional
643 parameter number when processing the expansion resulting in a crash.
644 Reported by Philippe Antoine.
646 The following bugs are resolved with this release:
648 [4737] libc: fork is not async-signal-safe
649 [5781] math: Slow dbl-64 sin/cos/sincos for special values
650 [10353] libc: Methods for deleting all file descriptors greater than
651 given integer (closefrom)
652 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
653 name containing multi-byte character(s)
654 [14469] math: Inaccurate j0f function
655 [14470] math: Inaccurate j1f function
656 [14471] math: Inaccurate y0f function
657 [14472] math: Inaccurate y1f function
658 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
660 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
661 crashes if it fails dlsym() twice
662 [15648] nptl: multiple definition of `__lll_lock_wait_private'
663 [16063] nptl: Provide a pthread_once variant in libc directly
664 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
665 [17145] libc: syslog with LOG_CONS leaks console file descriptor
666 [17183] manual: description of ENTRY struct in <search.h> in glibc
668 [18435] nptl: pthread_once hangs when init routine throws an exception
669 [18524] nptl: Missing calloc error checking in
670 __cxa_thread_atexit_impl
671 [19329] dynamic-link: dl-tls.c assert failure at concurrent
672 pthread_create and dlopen
673 [19366] nptl: returning from a thread should disable cancellation
674 [19511] nptl: 8MB memory leak in pthread_create in case of failure
675 when non-root user changes priority
676 [20802] dynamic-link: getauxval NULL pointer dereference after static
678 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
679 [22057] malloc: malloc_usable_size is broken with mcheck
680 [22668] locale: LC_COLLATE: the last character of ellipsis is not
682 [23323] libc: [RFE] CSU startup hardening.
683 [23328] malloc: Remove malloc hooks and ensure related APIs return no
685 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
686 $PLATFORM, $ORIGIN) crashes
687 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
688 [23554] nptl: pthread_getattr_np reports wrong stack size with
690 [24106] libc: Bash interpreter in ldd script is taken from host
691 [24773] dynamic-link: dlerror in an secondary namespace does not use
692 the right free implementation
693 [25036] localedata: Update collation order for Swedish
694 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
695 shm_open to pick wrong directory
696 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
697 crash in IFUNC resolver due to stack canary (--enable-stack-
699 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
700 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
701 [27111] dynamic-link: pthread_create and tls access use link_map
702 objects that may be concurrently freed by dlclose
703 [27132] malloc: memusagestat is linked to system librt, leading to
704 undefined symbols on major version upgrade
705 [27136] dynamic-link: dtv setup at thread creation may leave an entry
707 [27249] libc: libSegFault.so does not output signal number properly
708 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
710 [27318] dynamic-link: glibc fails to load binaries when built with
711 -march=sandybridge: CPU ISA level is lower than required
712 [27343] nss: initgroups() SIGSEGVs when called on a system without
713 nsswich.conf (in a chroot)
714 [27346] dynamic-link: x86: PTWRITE feature check is missing
715 [27389] network: NSS chroot hardening causes regressions in chroot
717 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
718 [27444] libc: sysconf reports unsupported option (-1) for
719 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
720 [27462] nscd: double-free in nscd (CVE-2021-27645)
721 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
722 malloc/tst-malloc-thread-fail
723 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
724 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
726 [27522] glob: glob, glob64 incorrectly marked as __THROW
727 [27555] dynamic-link: Static tests fail with --enable-stack-
729 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
730 information for the current directory
731 [27577] dynamic-link: elf/ld.so --help doesn't work
732 [27605] libc: tunables can't control xsave/xsavec selection in
734 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
735 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
737 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
738 _nss_files_getcanonname_r) from within a dlmopen namespace.
739 [27648] libc: FAIL: misc/tst-select
740 [27650] stdio: vfscanf returns too early if a match is longer than
742 [27651] libc: Performance regression after updating to 2.33
743 [27655] string: Wrong size calculation in string/test-strnlen.c
744 [27706] libc: select fails to update timeout on error
745 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
746 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
747 tries resolving them lazily
748 [27744] nptl: Support different libpthread/ld.so load orders in
750 [27749] libc: Data race __run_exit_handlers
751 [27761] libc: getconf: Segmentation fault when passing '-vq' as
753 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
754 exceeds maximum object size 2147483647
755 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
757 [27872] build: Obsolete configure option --enable-stackguard-
759 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
760 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
761 [27892] libc: powerpc: scv ABI error handling fails to check
763 [27896] nptl: mq_notify does not handle separately allocated thread
764 attributes (CVE-2021-33574)
765 [27901] libc: TEST_STACK_ALIGN doesn't work
766 [27902] libc: The x86-64 clone wrapper fails to align child stack
767 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
768 [27939] libc: aarch64: clone does not align the stack
769 [27968] libc: s390x: clone does not align the stack
770 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
771 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
773 [28028] malloc: malloc: tcache shutdown sequence does not work if the
774 thread never allocated anything
775 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
776 [28064] string: x86_64:wcslen implementation list has wcsnlen
777 [28067] libc: FAIL: posix/tst-spawn5
778 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
779 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
781 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
782 [28089] build: tst-tls20 fails when linker defaults to --as-needed
783 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
785 [28091] network: ns_name_skip may return 0 for domain names without
793 * The dynamic linker accepts the --list-tunables argument which prints
794 all the supported tunables. This option is disable if glibc is
795 configured with tunables disabled (--enable-tunables=no).
797 * The dynamic linker accepts the --argv0 argument and provides opportunity
798 to change argv[0] string.
800 * The dynamic linker loads optimized implementations of shared objects
801 from subdirectories under the glibc-hwcaps directory on the library
802 search path if the system's capabilities meet the requirements for
803 that subdirectory. Initially supported subdirectories include
804 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
805 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
806 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
807 subdirectory names correspond to the vendor-independent x86-64
808 microarchitecture levels defined in the x86-64 psABI supplement.
810 * The new --help option of the dynamic linker provides usage and
811 information and library search path diagnostics.
813 * The mallinfo2 function is added to report statistics as per mallinfo,
814 but with larger field widths to accurately report values that are
815 larger than fit in an integer.
817 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
819 * Support for the RISC-V ISA running on Linux has been expanded to run on
820 32-bit hardware. This is supported for the following ISA and ABI pairs:
826 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
829 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
830 glibc may use additional checks that may have an additional performance
831 overhead. At present these checks are available only on LLVM 9 and later.
832 The latest GCC available at this time (10.2) does not support this level of
835 Deprecated and removed features, and other changes affecting compatibility:
837 * The mallinfo function is marked deprecated. Callers should call
840 * When dlopen is used in statically linked programs, alternative library
841 implementations from HWCAP subdirectories are no longer loaded.
842 Instead, the default implementation is used.
844 * The deprecated <sys/vtimes.h> header and the function vtimes have been
845 removed. To support old binaries, the vtimes function continues to exist
846 as a compatibility symbol. Applications should use the getrlimit or
849 * Following a change in the tzdata 2018a release upstream, the zdump
850 program is now installed in the /usr/bin subdirectory. Previously,
851 the /usr/sbin subdirectory was used.
853 * On s390(x), the type float_t is now derived from the macro
854 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
855 hardcoded to double. This does not affect the ABI of any libraries
856 that are part of the GNU C Library, but may affect the ABI of other
857 libraries that use this type in their interfaces. The new definition
858 improves consistency with compiler behavior in many scenarios.
860 * A future version of glibc will stop loading shared objects from the
861 "tls" subdirectories on the library search path, the subdirectory that
862 corresponds to the AT_PLATFORM system name, and also stop employing
863 the legacy AT_HWCAP search mechanism. Applications should switch to
864 the new glibc-hwcaps mechanism instead; if they do not do that, only
865 the baseline version (directly from the search path directory) will be
868 Changes to build and runtime requirements:
870 * On Linux, the system administrator needs to configure /dev/pts with
871 the intended access modes for pseudo-terminals. glibc no longer
872 attemps to adjust permissions of terminal devices. The previous glibc
873 defaults ("tty" group, user read/write and group write) already
874 corresponded to what most systems used, so that grantpt did not
875 perform any adjustments.
877 * On Linux, the posix_openpt and getpt functions no longer attempt to
878 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
879 (and pseudo-terminals are supported), a devpts file system is mounted
880 on /dev/pts. Current systems already meet these requirements.
882 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
884 Security related changes:
886 CVE-2021-3326: An assertion failure during conversion from the
887 ISO-20220-JP-3 character set using the iconv function has been fixed.
888 This assertion was triggered by certain valid inputs in which the
889 converted output contains a combined sequence of two wide characters
890 crossing a buffer boundary. Reported by Tavis Ormandy.
892 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
893 invoked with input containing redundant shift sequences in the IBM1364,
894 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
896 CVE-2020-29562: An assertion failure has been fixed in the iconv function
897 when invoked with UCS4 input containing an invalid character.
899 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
900 invoked with EUC-KR input containing invalid multibyte input sequences.
902 The following bugs are resolved with this release:
904 [10635] libc: realpath portability patches
905 [16124] dynamic-link: ld.so should allow to change argv[0]
906 [17924] malloc: 'free' should not set errno
907 [18683] libc: Linux faccessat implementation can incorrectly ignore
909 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
910 [23091] hurd: missing waitid support
911 [23249] libc: Epyc and other current AMD CPUs do not select the
912 "haswell" platform subdirectory
913 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
915 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
917 [24941] libc: Make grantpt usable after multi-threaded fork in more
919 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
920 [24973] locale: iconv encounters segmentation fault when converting
921 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
922 [25399] string: undefined reference to `__warn_memset_zero_len' when
923 changing gnuc version
924 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
926 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
928 [25971] libc: s390 bits/hwcap.h out of sync with kernel
929 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
930 [26100] libc: Race in syslog(3) with regards to tag printing.
931 [26124] libc: Export <cpu-features.h>
932 [26130] nscd: Inconsistent nscd cache during pruning
933 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
934 [26224] locale: iconv hangs when converting some invalid inputs from
935 several IBM character sets (CVE-2020-27618)
936 [26341] libc: realpath cyclically call __alloca(path_max) to consume
938 [26343] manual: invalid documented return type for strerrorname_np(),
939 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
940 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
942 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
944 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
945 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
947 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
948 [26553] libc: mtx_init allows type set to "mtx_recursive" only
949 [26555] string: strerrorname_np does not return the documented value
950 [26592] libc: pointer arithmetic overflows in realpath
951 [26600] network: Transaction ID collisions cause slow DNS lookups in
953 [26606] libc: [2.33 Regression] pselect is broken on x32
954 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
955 [26620] glob: fnmatch with collating symbols results in segmentation
957 [26625] libc: [2.33 Regression] CET is disabled
958 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
959 at the end of a memory mapping
960 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
961 by the caller to the kernel
962 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
963 [26647] build: [-Werror=array-parameter=] due to different
964 declarations for __sigsetjmp
965 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
967 [26649] stdio: printf should handle non-normal x86 long double numbers
968 gracefully (CVE-2020-29573)
969 [26686] build: -Warray-parameter instances building with GCC 11
970 [26687] build: -Warray-bounds instances building with GCC 11
971 [26690] stdio: Aliasing violation in __vfscanf_internal
972 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
973 [26726] build: GCC warning calling new_composite_name with an array of
975 [26736] libc: FAIL: misc/tst-sysvshm-linux
976 [26737] libc: Random FAIL: rt/tst-shm
977 [26791] libc: Missing O_CLOEXEC in sysconf.c
978 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
980 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
982 [26818] string: aarch64: string tests may run ifunc variants that are
984 [26821] libc: Memory leak test failures on Fedora 33
985 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
986 FSGSBASE/LM/RDRAND check failure
987 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
989 [26853] libc: aarch64: Missing unwind information in statically linked
991 [26923] locale: Assertion failure in iconv when converting invalid
992 UCS4 (CVE-2020-29562)
993 [26926] dynamic-link: aarch64: library dependencies are not bti
995 [26932] libc: sh: Multiple floating point functions defined as stubs
997 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
999 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1001 [27002] build: libc_freeres_fn build failure with GCC 11
1002 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1003 [27008] dynamic-link: ld.so.cache should have endianness markup
1004 [27042] libc: [alpha] anonymous union in struct stat confuses
1006 [27053] libc: Conformance regression in system(3) (and probably also
1008 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1010 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1011 [27083] libc: Unsafe unbounded alloca in addmntent
1012 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1014 [27130] string: "rep movsb" performance issue
1015 [27150] libc: alpha: wait4() is unavailable in static linking
1016 [27177] dynamic-link:
1017 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1019 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1020 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1021 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1022 related to combining characters (CVE-2021-3326)
1029 * Unicode 13.0.0 Support: Character encoding, character type info, and
1030 transliteration tables are all updated to Unicode 13.0.0, using
1031 generator scripts contributed by Mike FABIAN (Red Hat).
1033 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1035 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1036 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1037 Three ABIs are supported:
1043 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1044 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1046 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1047 DT_DEPAUDIT dynamic section entries of the main executable.
1049 * powerpc64le supports IEEE128 long double libm/libc redirects when
1050 using -mabi=ieeelongdouble to compile C code on supported GCC
1051 toolchains. It is recommended to use GCC 8 or newer when testing
1054 * To help detect buffer overflows and other out-of-bounds accesses
1055 several APIs have been annotated with GCC 'access' attribute. This
1056 should help GCC 10 issue better warnings.
1058 * On Linux, functions pthread_attr_setsigmask_np and
1059 pthread_attr_getsigmask_np have been added. They allow applications
1060 to specify the signal mask of a thread created with pthread_create.
1062 * The GNU C Library now provides the header file <sys/single_threaded.h>
1063 which declares the variable __libc_single_threaded. Applications are
1064 encouraged to use this variable for single-thread optimizations,
1065 instead of weak references to symbols historically defined in
1068 * The functions sigabbrev_np and sigdescr_np have been added. The
1069 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1070 SIGHUP) while sigdescr_np returns a string describing the signal number
1071 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1072 attempt to translate the return description, both functions return
1073 NULL for an invalid signal number.
1075 They should be used instead of sys_siglist or sys_sigabbrev and they
1076 are both thread and async-signal safe. These functions are GNU extensions.
1078 * The functions strerrorname_np and strerrordesc_np have been added. The
1079 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1080 while strerrordesc_np returns a string describing the error number
1081 (e.g "Invalid argument" for EINVAL). Different than strerror,
1082 strerrordesc_np does not attempt to translate the return description, both
1083 functions return NULL for an invalid error number.
1085 They should be used instead of sys_errlist and sys_nerr, both are
1086 thread and async-signal safe. These functions are GNU extensions.
1088 * AArch64 now supports standard branch protection security hardening
1089 in glibc when it is built with a GCC that is configured with
1090 --enable-standard-branch-protection (or if -mbranch-protection=standard
1091 flag is passed when building both GCC target libraries and glibc,
1092 in either case a custom GCC is needed). This includes branch target
1093 identification (BTI) and pointer authentication for return addresses
1094 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1095 extensions respectively for the protection to be effective,
1096 otherwise the used instructions are nops. User code can use PAC-RET
1097 without libc support, but BTI requires a libc that is built with BTI
1098 support, otherwise runtime objects linked into user code will not be
1101 Deprecated and removed features, and other changes affecting compatibility:
1103 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1104 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1105 RPC header files. Backward compatibility for old programs is kept
1106 only for architectures and ABIs that have been added in or before
1107 glibc 2.31. New programs need to use TI-RPC
1108 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1109 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1111 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1112 as shared library for backward compatibility and the NSS modules "nis"
1113 and "nisplus" are not built at all and libnsl's headers aren't
1114 installed. This compatibility is kept only for architectures and ABIs
1115 that have been added in or before version 2.28. Replacement
1116 implementations based on TI-RPC, which additionally support IPv6, are
1117 available from <https://github.com/thkukuk/>. This change does not
1118 affect the "compat" NSS module, which does not depend on libnsl
1119 since 2.27 and thus can be used without NIS.
1121 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1122 removed. To support old binaries, the sysctl function continues to
1123 exist as a compatibility symbol (on those architectures which had it),
1124 but always fails with ENOSYS. This reflects the removal of the system
1125 call from all architectures, starting with Linux 5.5.
1127 * The sstk function is no longer available to newly linked binaries.
1128 Its implementation always returned with a failure, and the function
1129 was not declared in any header file.
1131 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1132 sigrelse, sigignore and sigset, and the sigmask macro have been
1133 deprecated. Applications should use the sigsuspend, sigprocmask and
1134 sigaction functions instead.
1136 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1137 already supported this format for almost 20 years.
1139 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1140 are no longer available to newly linked binaries, and their declarations
1141 have been removed from <string.h>. They are exported solely as
1142 compatibility symbols to support old binaries. All programs should use
1145 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1146 are no longer available to newly linked binaries, and their declarations
1147 have been removed from <stdio.h>. They are exported solely as
1148 compatibility symbols to support old binaries. All programs should use
1149 strerror or strerror_r instead.
1151 * Both strerror and strerror_l now share the same internal buffer in the
1152 calling thread, meaning that the returned string pointer may be invalided
1153 or contents might be overwritten on subsequent calls in the same thread or
1154 if the thread is terminated. It makes strerror MT-safe.
1156 * Using weak references to libpthread functions such as pthread_create
1157 or pthread_key_create to detect the singled-threaded nature of a
1158 program is an obsolescent feature. Future versions of glibc will
1159 define pthread_create within libc.so.6 itself, so such checks will
1160 always flag the program as multi-threaded. Applications should check
1161 the __libc_single_threaded variable declared in
1162 <sys/single_threaded.h> instead.
1164 * The "files" NSS module no longer supports the "key" database (used for
1165 secure RPC). The contents of the /etc/publickey file will be ignored,
1166 regardless of the settings in /etc/nsswitch.conf. (This method of
1167 storing RPC keys only supported the obsolete and insecure AUTH_DES
1168 flavor of secure RPC.)
1170 * The __morecore and __after_morecore_hook malloc hooks and the default
1171 implementation __default_morecore have been deprecated. Applications
1172 should use malloc interposition to change malloc behavior, and mmap to
1173 allocate anonymous memory. A future version of glibc may require that
1174 applications which use the malloc hooks must preload a special shared
1175 object, to enable the hooks.
1177 * The hesiod NSS module has been deprecated and will be removed in a
1178 future version of glibc. System administrators are encouraged to
1179 switch to other approaches for networked account databases, such as
1182 Changes to build and runtime requirements:
1184 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1185 long double redirects.
1187 Security related changes:
1189 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1190 invoked with the -c option and when processing invalid multi-byte input
1191 sequences. Reported by Jan Engelhardt.
1193 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1194 corruption when they were passed a pseudo-zero argument. Reported by Guido
1195 Vranken / ForAllSecure Mayhem.
1197 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1198 expanding ~user has been fixed.
1200 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1201 memmove functions has been fixed. Discovered by Jason Royes and Samual
1202 Dytrych of the Cisco Security Assessment and Penetration Team (See
1205 The following bugs are resolved with this release:
1207 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1208 [10441] manual: Backtraces code example lacks error checking
1209 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1210 timer_sigev_thread dangerous
1211 [14231] stdio: stdio-common tests memory requirements
1212 [14578] libc: /proc-based emulation for lchmod, fchmodat
1213 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1214 filtee has constructor
1215 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1216 sequences (CVE-2016-10228)
1217 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1218 character entities for infinity & pi
1219 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1220 segfaults in applications
1221 [20543] libc: Please move from .gnu.linkonce to comdat
1222 [22489] network: gcc warns about implicit convertion in
1223 ICMP6_FILTER_SETPASS with -Wsign-conversion
1224 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1225 [23294] math: Complex _FloatN functions are redirected to the wrong
1226 function with -mlong-double-64
1227 [23296] libc: Data race in setting function descriptor during lazy
1229 [23668] dynamic-link: ldconfig: Default to the new format for
1231 [23819] hurd: hurd: Add C11 thread support
1232 [23990] build: test-container error out on failure to exec child.
1233 [23991] build: shell-container typo in run_command_array
1234 [24638] manual: Error in example of parsing a template string
1235 [24654] manual: Wrong declaration of wcschr in libc manual
1236 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1238 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1239 dynamically loaded dsos
1240 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1241 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1243 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1244 restore EAX, ECX and EDX
1245 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1246 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1247 [25420] network: Race condition in resolv_conf.c can result in caching
1248 stale configuration forever
1249 [25487] math: sinl() stack corruption from crafted input
1251 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1253 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1254 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1256 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1257 on 32 bit and old kernel
1258 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1259 [25639] localedata: Some names of days and months wrongly spelt in
1261 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1262 amount of sigset_t bytes
1263 [25691] stdio: printf: memory leak when printing long multibyte
1265 [25715] libc: system() returns wrong errors when posix_spawn fails
1266 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1267 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1268 state for conversions that produce two Unicode code points
1269 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1270 for linux x86_64 leads to livelock
1271 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1272 test failures, invalid instruction in ld.so
1273 [25790] glob: Typo in tst-fnmatch.input
1274 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1276 [25819] localedata: Update locale data to Unicode 13.0.0
1277 [25824] libc: Abnormal function of strnlen in aarch64
1278 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1279 [25896] libc: Incorrect prctl
1280 [25902] libc: Bad LOADARGS_N
1281 [25905] dynamic-link: VSX registers are corrupted during PLT
1282 resolution when glibc is built with --disable-multi-arch and --with-
1284 [25933] string: Off by one error in __strncmp_avx2 when
1285 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1287 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1288 exiting detached thread
1289 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1291 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1293 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1294 [26073] math: getpayload() has wrong return value
1295 [26076] dynamic-link: dlmopen crashes after failing to load
1296 dependencies in audit mode
1297 [26120] localedata: column width of of some Korean
1298 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1299 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1300 [26133] libc: Incorrect need_arch_feature_F16C
1301 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1303 [26149] libc: PKU is usable only if OSPKE is set
1304 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1306 [26208] libc: Incorrect bit_cpu_CLFSH
1307 [26210] network: Incorrect use of hidden symbols for global sunrpc
1309 [26211] stdio: printf integer overflow calculating allocation size
1310 [26214] stdio: printf_fp double free
1311 [26215] stdio: printf_fp memory leak
1312 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1313 [26258] nss: nss_compat should not read input files with mmap
1314 [26332] string: Incorrect cache line size load causes memory
1315 corruption in memset
1322 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1323 enable features from the draft ISO C2X standard. Only some features from
1324 this draft standard are supported by the GNU C Library, and as the draft
1325 is under active development, the set of features enabled by this macro is
1326 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1327 by compiling with "gcc -std=gnu2x".
1329 * The <math.h> functions that round their results to a narrower type now
1330 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1331 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1332 Clarification Request 13 to TS 18661-3.
1334 * The function pthread_clockjoin_np has been added, enabling join with a
1335 terminated thread with a specific clock. It allows waiting against
1336 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1338 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1340 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1341 in queries if the trust-ad option is set via the options directive in
1342 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1343 mode, the AD bit, as provided by the name server, is available to
1344 applications which call res_search and related functions. In the default
1345 mode, the AD bit is not set in queries, and it is automatically cleared in
1346 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1347 servers and the network path to them are treated as untrusted.)
1349 Deprecated and removed features, and other changes affecting compatibility:
1351 * The totalorder and totalordermag functions, and the corresponding
1352 functions for other floating-point types, now take pointer arguments to
1353 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1354 passing. This is in accordance with the resolution of Clarification
1355 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1356 floating-point arguments directly will continue to work.
1358 * The obsolete function stime is no longer available to newly linked
1359 binaries, and its declaration has been removed from <time.h>.
1360 Programs that set the system time should use clock_settime instead.
1362 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1363 in a future version of glibc. In this release, the header still exists
1364 but calling ftime will cause a compiler warning. All programs should use
1365 gettimeofday or clock_gettime instead.
1367 * The gettimeofday function no longer reports information about a
1368 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1369 many years, as it cannot handle the full complexity of the world's
1370 timezones, but hitherto we have supported it on a best-effort basis.
1371 Changes required to support 64-bit time_t on 32-bit architectures have
1372 made this no longer practical.
1374 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1375 should expect to receive a 'struct timezone' whose tz_minuteswest and
1376 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1377 happen on a few Linux-based ports. This will be corrected in a future
1380 All callers should supply a null pointer for the 'tzp' argument to
1381 gettimeofday. For accurate information about the time zone associated
1382 with the current time, use the localtime function.
1384 gettimeofday itself is obsolescent according to POSIX. We have no plans
1385 to remove access to this function, but portable programs should consider
1386 using clock_gettime instead.
1388 * The settimeofday function can still be used to set a system-wide time
1389 zone when the operating system supports it. This is because the Linux
1390 kernel reused the API, on some architectures, to describe a system-wide
1391 time-zone-like offset between the software clock maintained by the kernel,
1392 and the "RTC" clock that keeps time when the system is shut down.
1394 However, to reduce the odds of this offset being set by accident,
1395 settimeofday can no longer be used to set the time and the offset
1396 simultaneously. If both of its two arguments are non-null, the call
1397 will fail (setting errno to EINVAL).
1399 Callers attempting to set this offset should also be prepared for the call
1400 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1401 some Linux architectures. The Linux kernel maintainers are discussing a
1402 more principled replacement for the reused API. After a replacement
1403 becomes available, we will change settimeofday to fail with ENOSYS on all
1404 platforms when its 'tzp' argument is not a null pointer.
1406 settimeofday itself is obsolescent according to POSIX. Programs that set
1407 the system time should use clock_settime and/or the adjtime family of
1408 functions instead. We may cease to make settimeofday available to newly
1409 linked binaries after there is a replacement for Linux's time-zone-like
1412 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1413 the optional CAS instruction is implemented (for instance, LEON processors
1414 are still supported, but SuperSPARC processors are not).
1416 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1419 * If a lazy binding failure happens during dlopen, during the execution of
1420 an ELF constructor, the process is now terminated. Previously, the
1421 dynamic loader would return NULL from dlopen, with the lazy binding error
1422 captured in a dlerror message. In general, this is unsafe because
1423 resetting the stack in an arbitrary function call is not possible.
1425 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1426 executable stack unless explicitly configured at build time to require
1427 minimum kernel version 4.8 or newer. This is because executing
1428 floating-point branches on a non-executable stack on Linux kernels prior to
1429 4.8 can lead to application crashes for some MIPS configurations. While
1430 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1431 expected to enable non-executable stack by default with PT_GNU_STACK by
1432 default and is thus likely to trigger a crash on older kernels.
1434 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1435 non-executable stack while dropping support for older kernels.
1437 * System call wrappers for time system calls now use the new time64 system
1438 calls when available. On 32-bit targets, these wrappers attempt to call
1439 the new system calls first and fall back to the older 32-bit time system
1440 calls if they are not present. This may cause issues in environments
1441 that cannot handle unsupported system calls gracefully by returning
1442 -ENOSYS. Seccomp sandboxes are affected by this issue.
1444 Changes to build and runtime requirements:
1446 * It is no longer necessary to have recent Linux kernel headers to build
1447 working (non-stub) system call wrappers on all architectures except 64-bit
1448 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1450 * The ChangeLog file is no longer present in the toplevel directory of the
1451 source tree. ChangeLog files are located in the ChangeLog.old directory as
1452 ChangeLog.N where the highest N has the latest entries.
1454 Security related changes:
1456 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1457 out-of-bounds write when executed in a signal frame context.
1459 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1460 environment variable during program execution after a security
1461 transition, allowing local attackers to restrict the possible mapping
1462 addresses for loaded libraries and thus bypass ASLR for a setuid
1463 program. Reported by Marcin Kościelnicki.
1465 The following bugs are resolved with this release:
1467 [12031] localedata: iconv -t ascii//translit with Greek characters
1468 [15813] libc: Multiple issues in __gen_tempname
1469 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1470 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1471 [19767] libc: vdso is not used with static linking
1472 [19903] hurd: Shared mappings not being inherited by children processes
1473 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1474 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1476 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1477 Symbols-A/B Unicode blocks
1478 [23518] libc: Eliminate __libc_utmp_jump_table
1479 [24026] malloc: malloc_info() returns wrong numbers
1480 [24054] localedata: Many locales are missing date_fmt
1481 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1482 [24304] dynamic-link: Lazy binding failure during ELF
1483 constructors/destructors is not fatal
1484 [24376] libc: RISC-V symbol size confusion with _start
1485 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1487 [24824] libc: test-in-container does not install charmap files compatible
1489 [24844] regex: regex bad pointer / leakage if malloc fails
1490 [24867] malloc: Unintended malloc_info formatting changes
1491 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1492 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1493 [24882] libc: login: pututline uses potentially outdated cache
1494 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1495 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1497 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1499 [24930] dynamic-link: dlopen of PIE executable can result in
1500 _dl_allocate_tls_init assertion failure
1501 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1502 (stringop-overflow error)
1503 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1504 functions other can lead to crashes
1505 [24967] libc: jemalloc static linking causes runtime failure
1506 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1508 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1509 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1510 [25097] libc: new -Warray-bounds with GCC 10
1511 [25112] dynamic-link: dlopen must not make new objects accessible when it
1512 still can fail with an error
1513 [25139] localedata: Please add the new mnw_MM locale
1514 [25149] regex: Array bounds violation in proceed_next_node
1515 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1516 initialized correctly
1517 [25189] libc: glibc's __glibc_has_include causes issues with clang
1519 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1520 value to an unsigned
1521 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1522 binaries (CVE-2019-19126)
1523 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1525 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1527 [25232] string: <string.h> does not enable const correctness for strchr et
1529 [25233] localedata: Consider "." as the thousands separator for sl_SI
1531 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1532 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1533 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1535 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1536 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1538 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1539 (dl_initfirst) link map pointer
1540 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1541 [25423] libc: Array overflow in backtrace on powerpc
1542 [25425] network: Missing call to __resolv_context_put in
1543 getaddrinfo.c:gethosts
1550 * Unicode 12.1.0 Support: Character encoding, character type info, and
1551 transliteration tables are all updated to Unicode 12.1.0, using
1552 generator scripts contributed by Mike FABIAN (Red Hat).
1554 * The dynamic linker accepts the --preload argument to preload shared
1555 objects, in addition to the LD_PRELOAD environment variable.
1557 * The twalk_r function has been added. It is similar to the existing
1558 twalk function, but it passes an additional caller-supplied argument
1559 to the callback function.
1561 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1563 * Minguo (Republic of China) calendar support has been added as an
1564 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1567 * The entry for the new Japanese era has been added for ja_JP locale.
1569 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1570 pvalloc, memalign, and posix_memalign fail now with total object size
1571 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1572 pointer subtraction within the allocated object, where results might
1573 overflow the ptrdiff_t type.
1575 * The dynamic linker no longer refuses to load objects which reference
1576 versioned symbols whose implementation has moved to a different soname
1577 since the object has been linked. The old error message, symbol
1578 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1579 link time reference, is gone.
1581 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1582 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1583 functions. These behave similarly to their "timed" equivalents, but also
1584 accept a clockid_t parameter to determine which clock their timeout should
1585 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1586 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1587 time of the wait (unlike with pthread_condattr_setclock, which requires
1588 the clock choice at initialization time).
1590 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1591 work, new resolvers can use a second argument which can be extended in
1592 the future, currently it contains the AT_HWCAP2 value.
1594 Deprecated and removed features, and other changes affecting compatibility:
1596 * The copy_file_range function fails with ENOSYS if the kernel does not
1597 support the system call of the same name. Previously, user space
1598 emulation was performed, but its behavior did not match the kernel
1599 behavior, which was deemed too confusing. Applications which use the
1600 copy_file_range function can no longer rely on glibc to provide a fallback
1601 on kernels that do not support the copy_file_range system call, and if
1602 this function returns ENOSYS, they will need to use their own fallback.
1603 Support for copy_file_range for most architectures was added in version
1604 4.5 of the mainline Linux kernel.
1606 * The functions clock_gettime, clock_getres, clock_settime,
1607 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1608 for new applications (on architectures which had them). Instead, the
1609 definitions in libc will be used automatically, which have been available
1612 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1613 and <sys/stropts.h> have been removed.
1615 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1616 resolver flag (deprecated in glibc 2.25) have been removed.
1618 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1619 resolver have been removed from <resolv.h>.
1621 * With --enable-bind-now, installed programs are now linked with the
1624 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1625 configurations) has been removed, following the deprecation of this
1626 subarchitecture in version 8 of GCC, and its removal in version 9.
1628 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1629 header have been removed.
1631 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1632 deprecated and will be removed from a future version of glibc.
1633 Application should directly access /proc instead. For obtaining random
1634 bits, the getentropy function can be used.
1636 Changes to build and runtime requirements:
1638 * GCC 6.2 or later is required to build the GNU C Library.
1640 Older GCC versions and non-GNU compilers are still supported when
1641 compiling programs that use the GNU C Library.
1643 Security related changes:
1645 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1646 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1647 has undefined behavior. On x32, the size_t argument may be passed
1648 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1649 32 bits. When it happened with the sign bit of RDX register set,
1650 memcmp gave the wrong result since it treated the size argument as
1651 zero. Reported by H.J. Lu.
1653 CVE-2019-9169: Attempted case-insensitive regular-expression match
1654 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1655 over-read. Reported by Hongxu Chen.
1657 The following bugs are resolved with this release:
1659 [2872] locale: Transliteration Cyrillic -> ASCII fails
1660 [6399] libc: gettid() should have a wrapper
1661 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1662 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1663 [17396] localedata: globbing for locale by [[.collating-element.]]
1664 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1665 [18465] malloc: memusagestat is built using system C library
1666 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1667 invalid input drops valid char
1668 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1669 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1670 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1671 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1672 [23352] malloc: __malloc_check_init still defined in public header
1674 [23403] nptl: Wrong alignment of TLS variables
1675 [23501] libc: nftw() doesn't return dangling symlink's inode
1676 [23733] malloc: Check the count before calling tcache_get()
1677 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1679 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1680 [23844] nptl: pthread_rwlock_trywrlock results in hang
1681 [23983] argparse: Missing compat versions of argp_failure and argp_error
1682 for long double = double
1683 [23984] libc: Missing compat versions of err.h and error.h functions for
1684 long double = double
1685 [23996] localedata: Dutch salutations
1686 [24040] libc: riscv64: unterminated call chain in __thread_start
1687 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1689 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1690 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1692 [24114] regex: regexec buffer read overrun in "grep -i
1693 '\(\(\)*.\)*\(\)\(\)\1'"
1694 [24122] libc: Segfaults if 0 returned from la_version
1695 [24153] stdio: Some input functions do not react to stdin assignment
1696 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1697 RDX is set) (CVE-2019-7309)
1698 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1699 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1700 not the default "nor"
1701 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1702 false positives, change to modern flexible array
1703 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1704 instructions while maintaining the robust mutex list due to missing
1706 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1707 unnecessary librt dependencies
1708 [24200] localedata: Revert first_weekday removal in en_IE locale
1709 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1710 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1711 [24216] malloc: Check for large bin list corruption when inserting
1713 [24228] stdio: old x86 applications that use legacy libio crash on exit
1714 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1716 [24293] localedata: Missing Minguo calendar support for TW locales
1717 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1718 tt_RU (Tatar) locale
1719 [24307] localedata: Update locale data to Unicode 12.0.0
1720 [24323] dynamic-link: dlopen should not be able open PIE objects
1721 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1722 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1723 tt_RU (Tatar) locale
1724 [24370] localedata: Add lang_name for tt_RU locale
1725 [24372] locale: Binary locale files are not architecture independent
1726 [24394] time: strptime %Ey mis-parses final year of era
1727 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1729 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1731 [24531] malloc: Malloc tunables give tcache assertion failures
1732 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1734 [24535] localedata: Update locale data to Unicode 12.1.0
1735 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1736 kernels and break testing
1737 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1738 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1739 [-Werror=format-overflow=]
1740 [24570] libc: alpha: compat msgctl uses __IPC_64
1741 [24584] locale: Data race in __wcsmbs_clone_conv
1742 [24588] stdio: Remove codecvt vtables from libio
1743 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1745 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1746 [24632] stdio: Old binaries which use freopen with default stdio handles
1748 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1750 [24652] localedata: szl_PL spelling correction
1751 [24695] nss: nss_db: calling getpwent after endpwent crashes
1752 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1753 in /etc/nsswitch.conf
1754 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1755 [24740] libc: getdents64 type confusion
1756 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1757 always implemented in the same library
1758 [24744] libc: Remove copy_file_range emulation
1759 [24757] malloc: memusagestat is linked against system libpthread
1760 [24794] libc: Partial test suite run builds corrupt test-in-container
1768 * The getcpu wrapper function has been added, which returns the currently
1769 used CPU and NUMA node. This function is Linux-specific.
1771 * A new convenience target has been added for distribution maintainers
1772 to build and install all locales as directories with files. The new
1773 target is run by issuing the following command in your build tree:
1774 'make localedata/install-locale-files', with an optional DESTDIR
1775 to set the install root if you wish to install into a non-default
1776 configured location.
1778 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1780 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1781 for _GNU_SOURCE, to match BSD environments.
1783 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1784 indicates that it will abort the transaction prior to entering the kernel
1785 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1786 suspended, and this caused some undefined side-effects issues by aborting
1787 transactions manually. Glibc avoided it by abort transactions manually on
1788 each syscall, but it lead to performance issues on newer kernels where the
1789 HTM state is saved and restore lazily (the state being saved even when the
1790 process actually does not use HTM).
1792 * The functions posix_spawn_file_actions_addchdir_np and
1793 posix_spawn_file_actions_addfchdir_np have been added, enabling
1794 posix_spawn and posix_spawnp to run the new process in a different
1795 directory. These functions are GNU extensions. The function
1796 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1799 * The popen and system do not run atfork handlers anymore (BZ#17490).
1800 Although it is a possible POSIX violation, the POSIX rationale in
1801 pthread_atfork documentation regarding atfork handlers is to handle
1802 inconsistent mutex state after a fork call in a multi-threaded process.
1803 In both popen and system there is no direct access to user-defined mutexes.
1805 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1806 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1808 - C-SKY ABIV2 soft-float little-endian
1809 - C-SKY ABIV2 hard-float little-endian
1811 * strftime's default formatting of a locale's alternative year (%Ey)
1812 has been changed to zero-pad the year to a minimum of two digits,
1813 like "%y". This improves the display of Japanese era years during
1814 the first nine years of a new era, and is expected to be harmless
1815 for all other locales (only Japanese locales regularly have
1816 alternative year numbers less than 10). Zero-padding can be
1817 overridden with the '_' or '-' flags (which are GNU extensions).
1819 * As a GNU extension, the '_' and '-' flags can now be applied to
1820 "%EY" to control how the year number is formatted; they have the
1821 same effect that they would on "%Ey".
1823 Deprecated and removed features, and other changes affecting compatibility:
1825 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1826 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1828 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1829 in <sys/procfs.h>, has been corrected to match the type actually used by
1830 the Linux kernel. This affects the size and layout of that structure on
1831 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1833 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1834 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1835 defined in <sys/procfs.h>, has been corrected to match the type actually
1836 used by the Linux kernel. This affects the size and layout of those
1839 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1840 meant to scan a string and allocate space for it with malloc, is now
1841 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1842 defined. This extension conflicts with C99's use of '%a' to scan a
1843 hexadecimal floating-point number, which is now available to programs
1844 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1846 POSIX.1-2008 includes the feature of allocating a buffer for string input
1847 with malloc, using the modifier letter 'm' instead. Programs using
1848 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1849 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1850 C99 '%a' no longer need to avoid _GNU_SOURCE.
1852 GCC's -Wformat warnings can detect most uses of this extension, as long
1853 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1854 __attribute__ ((format (scanf, ...))).
1856 Changes to build and runtime requirements:
1858 * Python 3.4 or later is required to build the GNU C Library.
1860 * On most architectures, GCC 5 or later is required to build the GNU C
1861 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1863 Older GCC versions and non-GNU compilers are still supported when
1864 compiling programs that use the GNU C Library.
1866 Security related changes:
1868 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1869 denial of service due to resource exhaustion when processing getaddrinfo
1870 calls with crafted host names. Reported by Guido Vranken.
1872 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1873 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1874 happened, accessing the 32-bit size_t value as the full 64-bit register
1875 in the assembly string/memory functions would cause a buffer overflow.
1876 Reported by H.J. Lu.
1878 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1879 addresses with arbitrary trailing characters, potentially leading to data
1880 or command injection issues in applications.
1882 The following bugs are resolved with this release:
1884 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1885 [10496] localedata: 12h time representation in multiple locales faulty
1886 [10797] localedata: it_IT locale numeric does not have a separator for
1888 [11319] libc: dprintf doesn't handle errors properly
1889 [16346] time: mktime: potentially unsafe use of localtime_offset
1890 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1892 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1893 posix_spawn_file_actions_addfchdir_np
1894 [17426] localedata: Indian locales: set the correct date format
1895 [17490] stdio: popen should not invoke atfork handlers
1896 [17783] libc: TIOCSER_TEMT conditions inconsistent
1897 [18040] regex: use-after-free in regexec/get_subexp
1898 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1899 [20018] network: getaddrinfo should reject IP addresses with trailing
1900 characters (CVE-2016-10739)
1901 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1902 [20271] libc: Missing "\n" in __libc_fatal calls
1903 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1904 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1905 pointer argument is non-NULL
1906 [21037] stdio: open_memstream and freopen
1907 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1908 [21716] time: Crash in glibc's mktime in low-memory situations
1909 [22834] stdio: Subprocess forked by popen may crash in Linux when
1910 multithreads call popen
1911 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1912 and pthread_create fails.
1913 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1914 [23125] libc: riscv64: endless loop when throwing an exception from a
1916 [23275] nptl: Race in pthread_mutex_lock while promoting to
1917 PTHREAD_MUTEX_ELISION_NP.
1918 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1920 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1922 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1924 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1925 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1927 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1928 [23521] nss: get_next_alias nss_files file stream leak
1929 [23538] nptl: Hang in pthread_cond_broadcast
1930 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1931 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1932 [23579] libc: Errors misreported in preadv2
1933 [23597] build: support/test-container.c doesn't work with different
1935 [23603] time: mktime signed integer overflow on large timestamps
1936 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1937 [23614] libc: powerpc: missing CFI register information in __mpn_*
1939 [23637] string: Generic strstr/strcasestr fails with huge needles
1940 [23640] libc: no way to easily clear FD_CLOEXEC in
1941 posix_spawn_file_actions_adddup2()
1942 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1944 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1946 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1947 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1948 bits/types/struct_rusage.h
1949 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1951 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1953 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1954 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1955 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1957 [23724] localedata: Albanian date formats are incorrect
1958 [23735] math: libnldbl_nonshared.a references internal libm symbols
1959 [23740] localedata: kl_GL: Month names and date formats need update
1960 [23744] regex: regex refactorings to remove BE, avoid duplication
1961 [23745] time: mktime fix for Gnulib + coreutils
1962 [23758] time: Improve the width of alternate representation for year in
1964 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1965 [23789] time: mktime does not set errno on failure
1966 [23791] localedata: Wrong monetary format for ca_ES locale
1967 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1968 [23794] locale: c16rtomb does not handle surrogate pairs
1969 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1970 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1971 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1972 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1973 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1974 [23862] libc: [sh] missing kernel-features.h undefines
1975 [23864] libc: [riscv] missing kernel-features.h undefines
1976 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1977 [23907] malloc: Incorrect double-free malloc tcache check disregards
1979 [23913] libc: off-by-one in function maybe_script_execute in
1980 sysdeps/posix/spawni.c
1981 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1982 [23923] locale: Add --no-hard-links option to localedef
1983 [23927] network: Linux if_nametoindex() does not close descriptor
1985 [23961] math: powf can overflow to inf without setting errno in non-
1986 nearest rounding mode
1987 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1988 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1989 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1990 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1991 [24011] localedata: Fixed small type in comment for locale bs_BA
1992 [24018] libc: gettext() may return NULL
1993 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1994 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1995 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1997 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1998 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2000 [24046] localedata: en_US locale doesn't define date_fmt
2001 [24063] manual: @var{errno} should be @code{errno}
2002 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2003 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2005 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2007 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2009 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2011 [24112] network: Do not send DNS queries for non-host names (where all
2012 answers will be rejected)
2013 [24130] libc: alpha __remqu corrupts $f3 register
2020 * The localization data for ISO 14651 is updated to match the 2016
2021 Edition 4 release of the standard, this matches data provided by
2022 Unicode 9.0.0. This update introduces significant improvements to the
2023 collation of Unicode characters. This release deviates slightly from
2024 the standard in that the collation element ordering for lowercase and
2025 uppercase LATIN script characters is adjusted to ensure that regular
2026 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2027 is not matched by [a-z]. With the update many locales have been
2028 updated to take advantage of the new collation information. The new
2029 collation information has increased the size of the compiled locale
2030 archive or binary locales.
2032 * The GNU C Library can now be compiled with support for Intel CET, AKA
2033 Intel Control-flow Enforcement Technology. When the library is built
2034 with --enable-cet, the resulting glibc is protected with indirect
2035 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2036 compatible with all existing executables and shared libraries. This
2037 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2038 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2039 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2040 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2041 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2042 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2045 * The GNU C Library now has correct support for ABSOLUTE symbols
2046 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2047 relocated incorrectly or in some cases discarded. The GNU linker can
2048 make use of the newer semantics, but it must communicate it to the
2049 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2050 field) to indicate such support is required.
2052 * Unicode 11.0.0 Support: Character encoding, character type info, and
2053 transliteration tables are all updated to Unicode 11.0.0, using
2054 generator scripts contributed by Mike FABIAN (Red Hat).
2056 * <math.h> functions that round their results to a narrower type are added
2057 from TS 18661-1:2014 and TS 18661-3:2015:
2059 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2060 fMxaddfNx functions.
2062 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2063 fMxsubfNx functions.
2065 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2066 fMxmulfNx functions.
2068 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2069 fMxdivfNx functions.
2071 * Two grammatical forms of month names are now supported for the following
2072 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2073 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2074 support two grammatical forms in abbreviated month names: Catalan, Greek,
2077 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2078 include the support for two grammatical forms of month names.
2080 * Building and running on GNU/Hurd systems now works without out-of-tree
2083 * The renameat2 function has been added, a variant of the renameat function
2084 which has a flags argument. If the flags are zero, the renameat2 function
2085 acts like renameat. If the flag is not zero and there is no kernel
2086 support for renameat2, the function will fail with an errno value of
2087 EINVAL. This is different from the existing gnulib function renameatu,
2088 which performs a plain rename operation in case of a RENAME_NOREPLACE
2089 flags and a non-existing destination (and therefore has a race condition
2090 that can clobber the destination inadvertently).
2092 * The statx function has been added, a variant of the fstatat64
2093 function with an additional flags argument. If there is no direct
2094 kernel support for statx, glibc provides basic stat support based on
2095 the fstatat64 function.
2097 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2098 library if installed. libidn2 version 2.0.5 or later is recommended. If
2099 libidn2 is not available, internationalized domain names are not encoded
2100 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2101 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2102 with an encoding error.) Flags which used to change the IDN encoding and
2103 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2104 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2105 deprecated. They no longer have any effect.
2107 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2108 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2109 range of ELF gABI expressions including such constructs as
2110 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2111 have been further restricted, and where in the past a dynamic string
2112 token sequence may have been interpreted as a literal string it will
2113 now cause a load failure. These load failures were always considered
2114 unspecified behaviour from the perspective of the dynamic loader, and
2115 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2116 results in a load failure now.
2118 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2119 implementation includes all the standard functions provided by
2122 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2123 thrd_detach, thrd_exit, and thrd_join for thread management.
2125 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2126 mtx_destroy for mutual exclusion.
2128 - call_once for function call synchronization.
2130 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2131 cnd_wait for conditional variables.
2133 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2135 Application developers must link against libpthread to use ISO C threads.
2137 Deprecated and removed features, and other changes affecting compatibility:
2139 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2140 installed. Software that was using either header should be updated to
2141 use standard <stdio.h> interfaces instead.
2143 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2144 This was never required by the C standard, and the macros just expanded
2145 to call alternative names for the same functions. If you hoped getc and
2146 putc would provide performance improvements over fgetc and fputc, instead
2147 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2148 necessary, flockfile and funlockfile.
2150 * All stdio functions now treat end-of-file as a sticky condition. If you
2151 read from a file until EOF, and then the file is enlarged by another
2152 process, you must call clearerr or another function with the same effect
2153 (e.g. fseek, rewind) before you can read the additional data. This
2154 corrects a longstanding C99 conformance bug. It is most likely to affect
2155 programs that use stdio to read interactive input from a terminal.
2158 * The macros 'major', 'minor', and 'makedev' are now only available from
2159 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2160 headers that happen to include <sys/types.h>. These macros are rarely
2161 used, not part of POSIX nor XSI, and their names frequently collide with
2162 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2163 further explanation.
2165 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2166 these macros should first include <sys/types.h>, and then include
2167 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2169 * The tilegx*-*-linux-gnu configurations are no longer supported.
2171 * The obsolete function ustat is no longer available to newly linked
2172 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2173 function has been deprecated in favor of fstatfs and statfs.
2175 * The obsolete function nfsservctl is no longer available to newly linked
2176 binaries. This function was specific to systems using the Linux kernel
2177 and could not usefully be used with the GNU C Library on systems with
2178 version 3.1 or later of the Linux kernel.
2180 * The obsolete function name llseek is no longer available to newly linked
2181 binaries. This function was specific to systems using the Linux kernel
2182 and was not declared in a header. Programs should use the lseek64 name
2183 for this function instead.
2185 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2186 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2187 previously selected by them is now always enabled.
2189 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2190 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2191 restriction (rejecting '_' in host names, among other things) has been
2192 removed, for increased compatibility with non-IDN name resolution.
2194 * The fcntl function now have a Long File Support variant named fcntl64. It
2195 is added to fix some Linux Open File Description (OFD) locks usage on non
2196 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2197 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2198 locks act as a cancellation entrypoint.
2200 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2201 ecb_crypt, and des_setparity are no longer available to newly linked
2202 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2203 longer installed. These functions encrypted and decrypted data with the
2204 DES block cipher, which is no longer considered secure. Software that
2205 still uses these functions should switch to a modern cryptography library,
2208 * Reflecting the removal of the encrypt and setkey functions above, the
2209 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2210 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2213 * The obsolete function fcrypt is no longer available to newly linked
2214 binaries. It was just another name for the standard function crypt,
2215 and it has not appeared in any header file in many years.
2217 * We have tentative plans to hand off maintenance of the passphrase-hashing
2218 library, libcrypt, to a separate development project that will, we hope,
2219 keep up better with new passphrase-hashing algorithms. We will continue
2220 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2221 'crypt_r' should not need to change at all; however, distributions will
2222 need to install <crypt.h> and libcrypt from a separate project.
2224 In this release, if the configure option --disable-crypt is used, glibc
2225 will not install <crypt.h> or libcrypt, making room for the separate
2226 project's versions of these files. The plan is to make this the default
2227 behavior in a future release.
2229 Changes to build and runtime requirements:
2231 GNU make 4.0 or later is now required to build glibc.
2233 Security related changes:
2235 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2236 been fixed by removing the glibc-internal IDNA implementation and using
2237 the system-provided libidn2 library instead. Originally reported by Hanno
2238 Böck and Christian Weisgerber.
2240 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2241 architecture could corrupt memory. Reported by Max Horn.
2243 CVE-2018-11236: Very long pathname arguments to realpath function could
2244 result in an integer overflow and buffer overflow. Reported by Alexey
2247 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2248 architecture could write beyond the target buffer, resulting in a buffer
2249 overflow. Reported by Andreas Schwab.
2251 The following bugs are resolved with this release:
2253 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2254 [6889] manual: 'PWD' mentioned but not specified
2255 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2256 when __WORDSIZE != 64
2257 [13762] regex: re_search etc. should return -2 on memory exhaustion
2258 [13888] build: /tmp usage during testing
2259 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2260 [14092] nptl: Support C11 threads
2261 [14095] localedata: Review / update collation data from Unicode / ISO
2263 [14508] libc: -Wformat warnings
2264 [14553] libc: Namespace pollution loff_t in sys/types.h
2265 [14890] libc: Make NT_PRFPREG canonical.
2266 [15105] libc: Extra PLT references with -Os
2267 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2269 [16335] manual: Feature test macro documentation incomplete and out of
2271 [16552] libc: Unify umount implementations in terms of umount2
2272 [17082] libc: htons et al.: statement-expressions prevent use on global
2273 scope with -O1 and higher
2274 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2275 [17438] localedata: pt_BR: wrong d_fmt delimiter
2276 [17662] libc: please implement binding for the new renameat2 syscall
2277 [17721] libc: __restrict defined as /* Ignore */ even in c11
2278 [17979] libc: inconsistency between uchar.h and stdint.h
2279 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2280 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2281 horrible machine code)
2282 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2284 [18471] libc: llseek should be a compat symbol
2285 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2287 [18991] nss: nss_files skips large entry in database
2288 [19239] libc: Including stdlib.h ends up with macros major and minor being
2290 [19463] libc: linknamespace failures when compiled with -Os
2291 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2292 [19527] locale: Normalized charset name not recognized by setlocale
2293 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2294 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2296 [19728] network: out of bounds stack read in libidn function
2297 idna_to_ascii_4i (CVE-2016-6261)
2298 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2299 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2300 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2302 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2303 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2304 [20419] dynamic-link: files with large allocated notes crash in
2306 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2307 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2308 [20980] manual: CFLAGS environment variable replaces vital options
2309 [21163] regex: Assertion failure in pop_fail_stack when executing a
2310 malformed regexp (CVE-2015-8985)
2311 [21234] manual: use of CFLAGS makes glibc detect no optimization
2312 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2313 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2314 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2315 [21508] locale: intl/tst-gettext failure with latest msgfmt
2316 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2317 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2318 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2320 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2322 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2323 [22247] network: Integer overflow in the decode_digit function in
2324 puny_decode.c in libidn (CVE-2017-14062)
2325 [22342] nscd: NSCD not properly caching netgroup
2326 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2327 [22550] localedata: es_ES locale (and other es_* locales): collation
2328 should treat ñ as a primary different character, sync the collation
2329 for Spanish with CLDR
2330 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2331 by gcc configured with --enable-default-pie
2332 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2333 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2334 crossing 2GB threshold (CVE-2017-18269)
2335 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2337 [22735] time: Misleading typo in time.h source comment regarding
2339 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2340 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2341 `__assert_perror_fail ()' to `__assert_fail_base ()'
2342 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2344 [22786] libc: Stack buffer overflow in realpath() if input size is close
2345 to SSIZE_MAX (CVE-2018-11236)
2346 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2347 through an absolute DT_NEEDED path
2348 [22792] build: tcb-offsets.h dependency dropped
2349 [22797] libc: pkey_get() uses non-reserved name of argument
2350 [22807] libc: PTRACE_* constants missing for powerpc
2351 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2352 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2353 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2354 [22848] localedata: ca_ES: update date definitions from CLDR
2355 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2356 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2357 [22896] localedata: Update locale data for an_ES
2358 [22902] math: float128 test failures with GCC 8
2359 [22918] libc: multiple common of `__nss_shadow_database'
2360 [22919] libc: sparc32: backtrace yields infinite backtrace with
2362 [22926] libc: FTBFS on powerpcspe
2363 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2365 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2366 [22947] libc: FAIL: misc/tst-preadvwritev2
2367 [22963] localedata: cs_CZ: Add alternative month names
2368 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2369 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2370 [22998] dynamic-link: execstack tests are disabled when SELinux is
2372 [23005] network: Crash in __res_context_send after memory allocation
2374 [23007] math: strtod cannot handle -nan
2375 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2376 [23036] regex: regex equivalence class regression
2377 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2378 [23069] libc: sigaction broken on riscv64-linux-gnu
2379 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2380 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2381 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2382 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2383 and libc build with -Os)
2384 [23140] localedata: More languages need two forms of month names
2385 [23145] libc: _init/_fini aren't marked as hidden
2386 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2387 [23171] math: C++ iseqsig for long double converts arguments to double
2388 [23178] nscd: sudo will fail when it is run in concurrent with commands
2389 that changes /etc/passwd
2390 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2392 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2393 [23208] localedata: New locale - Lower Sorbian (dsb)
2394 [23233] regex: Memory leak in build_charclass_op function in file
2396 [23236] stdio: Harden function pointers in _IO_str_fields
2397 [23250] nptl: Offset of __private_ss differs from GCC
2398 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2399 -mtune=generic -mfpmath=sse
2400 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2402 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2403 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2405 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2406 [23277] math: nan function should not have const attribute
2407 [23279] math: scanf and strtod wrong for some hex floating-point
2408 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2410 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2411 [23303] build: undefined reference to symbol
2412 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2413 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2415 [23313] stdio: libio vtables validation and standard file object
2417 [23329] libc: The __libc_freeres infrastructure is not properly run across
2419 [23349] libc: Various glibc headers no longer compatible with
2421 [23351] malloc: Remove unused code related to heap dumps and malloc
2423 [23363] stdio: stdio-common/tst-printf.c has non-free license
2424 [23396] regex: Regex equivalence regression in single-byte locales
2425 [23422] localedata: oc_FR: More updates of locale data
2426 [23442] build: New warning with GCC 8
2427 [23448] libc: Out of bounds access in IBM-1390 converter
2428 [23456] libc: Wrong index_cpu_LZCNT
2429 [23458] build: tst-get-cpu-features-static isn't added to tests
2430 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2432 [23467] dynamic-link: x86/CET: A property note parser bug
2439 * The GNU C Library can now be compiled with support for building static
2440 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2441 executables are like static executables but can be loaded at any address
2442 and provide additional security hardening benefits at the cost of some
2443 memory and performance. When the library is built with --enable-static-pie
2444 the resulting libc.a is usable with GCC 8 and above to create static PIE
2445 executables using the GCC option '-static-pie'. This feature is currently
2446 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2447 aarch64 with binutils 2.30 or later.
2449 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2450 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2453 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2455 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2457 * In order to support faster and safer process termination the malloc API
2458 family of functions will no longer print a failure address and stack
2459 backtrace after detecting heap corruption. The goal is to minimize the
2460 amount of work done after corruption is detected and to avoid potential
2461 security issues in continued process execution. Reducing shutdown time
2462 leads to lower overall process restart latency, so there is benefit both
2463 from a security and performance perspective.
2465 * The abort function terminates the process immediately, without flushing
2466 stdio streams. Previous glibc versions used to flush streams, resulting
2467 in deadlocks and further data corruption. This change also affects
2468 process aborts as the result of assertion failures.
2470 * On platforms where long double has the IEEE binary128 format (aarch64,
2471 alpha, mips64, riscv, s390 and sparc), the math library now implements
2472 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2473 These are the same interfaces added in version 2.26 for some platforms where
2474 this format is supported but is not the format of long double.
2476 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2477 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2478 implements interfaces for that type, as defined by ISO/IEC TS
2479 18661-3:2015. These are corresponding interfaces to those supported for
2482 * The math library now implements interfaces for the _Float32, _Float64 and
2483 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2484 corresponding interfaces to those supported for _Float128.
2486 * glibc now implements the memfd_create and mlock2 functions on Linux.
2488 * Support for memory protection keys was added. The <sys/mman.h> header now
2489 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2492 * The copy_file_range function was added.
2494 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2496 * The ldconfig utility now processes `include' directives using the C/POSIX
2497 collation ordering. Previous glibc versions used locale-specific
2498 ordering, the change might break systems that relied on that.
2500 * Support for two grammatical forms of month names has been added.
2501 In a call to strftime, the "%B" and "%b" format specifiers will now
2502 produce the grammatical form required when the month is used as part
2503 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2504 required when the month is named by itself. For instance, in Greek
2505 and in many Slavic and Baltic languages, "%B" will produce the month
2506 in genitive case, and "%OB" will produce the month in nominative case.
2508 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2509 are all valid and will all accept any known form of month
2510 name---standalone or complete, abbreviated or full. In a call to
2511 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2512 the strings used by "%B" and "%b", respectively. New query
2513 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2514 used by "%OB" and "%Ob", respectively.
2516 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2517 define the strings for %OB and %Ob, respectively; these have the
2518 same syntax as "mon" and "abmon". These arrays are optional; if they
2519 are not provided then they have the same content as "mon" and "abmon",
2522 These features are provided for locales which define "alt_mon" and/or
2523 "ab_alt_mon" in their locale source data. This release includes such
2524 alternative month name data for the following languages: Belarusian,
2525 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2527 This feature is currently a GNU extension, but it is expected to
2528 be added to the next revision of POSIX, and it is also already
2529 available on some BSD-derived operating systems.
2531 This feature will cause existing statically compiled applications
2532 to fail to load locales and fall back to the builtin C/POSIX locales.
2533 See notes below for other changes affecting compatibility.
2535 * Support for the RISC-V ISA running on Linux has been added. This port
2536 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2537 for the following ISA and ABI pairs:
2543 Deprecated and removed features, and other changes affecting compatibility:
2545 * Statically compiled applications attempting to load locales compiled for the
2546 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2547 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2548 support for two grammatical forms of the month names, also extends the locale
2549 data binary format. Static applications needing locale support must be
2550 recompiled to match the runtime and data they are deployed with. In some
2551 distributions there is an upgrade window where dynamically linked applications
2552 may use a new library but the old locale data and also fall back to the
2553 builtin C/POSIX locales; restarting the application process is sufficient to
2556 * Support for statically linked applications which call dlopen is deprecated
2557 and will be removed in a future version of glibc. Applications which call
2558 dlopen need to be linked dynamically instead.
2560 * Support for old programs which use internal stdio data structures and
2561 functions is deprecated. This includes programs which use the C++ streams
2562 provided by libstdc++ in GCC 2.95. Programs which use the internal
2563 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2564 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2565 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2566 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2567 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2568 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2569 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2570 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2571 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2572 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2573 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2574 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2575 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2576 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2577 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2578 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2579 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2580 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2581 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2582 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2583 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2584 future version of glibc. Unlike other symbol removals, these old
2585 applications will not be supported using compatibility symbols.
2587 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2588 defined by <sys/ptrace.h>.
2590 * libm no longer supports SVID error handling (calling a user-provided
2591 matherr function on error) or the _LIB_VERSION variable to control error
2592 handling. (SVID error handling and the _LIB_VERSION variable still work
2593 for binaries linked against older versions of the GNU C Library.) The
2594 libieee.a library is no longer provided. math.h no longer defines struct
2595 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2596 TLOSS, PLOSS and HUGE.
2598 * The libm functions pow10, pow10f and pow10l are no longer supported for
2599 new programs. Programs should use the standard names exp10, exp10f and
2600 exp10l for these functions instead.
2602 * The mcontext_t type is no longer the same as struct sigcontext. On
2603 platforms where it was previously the same, this changes the C++ name
2604 mangling for interfaces involving this type.
2606 * The add-ons mechanism for building additional packages at the same time as
2607 glibc has been removed. The --enable-add-ons configure option is now
2610 * The --without-fp configure option is now ignored. Whether hardware
2611 floating-point instructions are used is now configured based on whether
2612 the compiler used at configure time (without any options implied by a
2613 --with-cpu= configure option) uses such instructions.
2615 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2616 the specified string can be parsed as a domain name.
2618 * In the malloc_info output, the <heap> element may contain another <aspace>
2619 element, "subheaps", which contains the number of sub-heaps.
2621 * The libresolv function p_secstodate is no longer supported for new
2624 * The tilepro-*-linux-gnu configuration is no longer supported.
2626 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2627 and will be removed in a future release. Software that is still using
2628 either header should be updated to use standard <stdio.h> interfaces
2631 libio.h was originally the header for a set of supported GNU extensions,
2632 but they have not been maintained as such in many years, they are now
2633 standing in the way of improvements to stdio, and we don't think there are
2634 any remaining external users. _G_config.h was never intended for public
2635 use, but predates the bits convention.
2637 Changes to build and runtime requirements:
2639 * bison version 2.7 or later is required to generate code in the 'intl'
2642 Security related changes:
2644 CVE-2009-5064: The ldd script would sometimes run the program under
2645 examination directly, without preventing code execution through the
2646 dynamic linker. (The glibc project disputes that this is a security
2647 vulnerability; only trusted binaries must be examined using the ldd
2650 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2651 suffered from a one-byte overflow during ~ operator processing (either
2652 on the stack or the heap, depending on the length of the user name).
2653 Reported by Tim Rühsen.
2655 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2656 would sometimes fail to free memory allocated during ~ operator
2657 processing, leading to a memory leak and, potentially, to a denial
2660 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2661 without GLOB_NOESCAPE, could write past the end of a buffer while
2662 unescaping user names. Reported by Tim Rühsen.
2664 CVE-2017-17426: The malloc function, when called with an object size near
2665 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2666 instead of NULL. This was a regression introduced with the new malloc
2667 thread cache in glibc 2.26. Reported by Iain Buclaw.
2669 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2670 to the allocation of too much memory. (This is not a security bug per se,
2671 it is mentioned here only because of the CVE assignment.) Reported by
2674 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2675 of the number of search path components. (This is not a security
2676 vulnerability per se because no trust boundary is crossed if the fix for
2677 CVE-2017-1000366 has been applied, but it is mentioned here only because
2678 of the CVE assignment.) Reported by Qualys.
2680 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2681 for AT_SECURE or SUID binaries could be used to load libraries from the
2684 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2685 succeeds without returning an absolute path due to unexpected behaviour
2686 of the Linux kernel getcwd syscall. Reported by halfdog.
2688 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2689 an object size near the value of SIZE_MAX, would return a pointer to a
2690 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2692 CVE-2018-6551: The malloc function, when called with an object size near
2693 the value of SIZE_MAX, would return a pointer to a buffer which is too
2694 small, instead of NULL.
2696 The following bugs are resolved with this release:
2698 [866] glob: glob should match dangling symlinks
2699 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2700 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2702 [5997] math: Very slow execution of sinf function
2703 [10580] localedata: hr_HR: updated locale
2704 [10871] locale: 'mon' array should contain both nominative and genitive
2706 [12349] localedata: eu_ES: incorrect thousands separator
2707 [13605] localedata: shn_MM: new Shan locale
2708 [13805] localedata: ru_RU: currency should use ',' as radix point
2709 [13953] localedata: km_KH: locale update
2710 [13994] localedata: mjw_IN: new locale
2711 [14121] build: make writes .mo files in po directory
2712 [14333] libc: Fix the race between atexit() and exit()
2713 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2714 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2716 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2717 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2718 width Latin characters
2719 [15332] localedata: es_CU: locale update
2720 [15436] stdio: Don't close or flush stdio streams on abort
2721 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2723 [16148] localedata: ca_ES: incorrect thousands separator
2724 [16750] dynamic-link: ldd should not try to execute the binaries
2726 [16777] localedata: pl_PL: incorrect thousands separator in locale
2727 [16905] localedata: hanzi: new collation
2728 [17563] localedata: cmn_TW: add hanzi collation
2729 [17750] localedata: wrong collation order of diacritics in most locales
2730 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2732 [17956] build: Build fails on missing definitions from header file
2733 nss/nss.h when Mozilla NSS is used for cryptography
2734 [18203] libc: realpath() does not handle unreachable paths correctly
2735 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2736 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2737 [18822] libc: Internal functions are called via PLT
2738 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2739 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2740 [19574] libc: glibc should support building static PIE binaries
2741 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2743 [19971] glob: glob: Do not skip entries with zero d_ino values
2744 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2745 [20008] localedata: km_KH: convert to translit_neutral
2746 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2747 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2748 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2749 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2750 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2752 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2753 they're set, wrong errors returned by gaih_inet when lookup functions
2755 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2756 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2758 [20952] localedata: yuw_PG: new locale
2759 [21084] localedata: charmaps/IBM858: new codepage
2760 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2761 [21242] libc: assert gives pedantic warning in old gcc versions
2762 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2763 __regcall calling convention
2764 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2765 [21326] libc: C99 functions are not declared for C++11 and later if
2766 _GNU_SOURCE is not predefined by g++
2767 [21457] libc: sys/ucontext.h namespace
2768 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2769 [21660] math: GCC fails to compile a formula with tgmath.h
2770 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2771 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2772 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2773 [21684] math: tgmath.h handling of complex integers
2774 [21685] math: tgmath.h handling of bit-fields
2775 [21686] math: tgmath.h handling of __int128
2776 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2778 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2780 [21750] localedata: column width of characters incompatible with classical
2782 [21754] malloc: malloc: Perform as little work as possible after heap
2783 consistency check failures
2784 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2785 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2786 [21791] string: Unused XXX_chk_XXX functions in libc.a
2787 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2789 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2791 [21845] localedata: Added new Locale bho_NP
2792 [21853] localedata: Fix abday Which looks same as day in zh_SG
2793 [21854] localedata: Added New Locale en_SC
2794 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2795 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2796 _dl_runtime_resolve_avx_slow
2797 [21885] network: getaddrinfo: gethosts does not release resolver context
2798 on memory allocation failure
2799 [21899] libc: XPG4.2 sigaction namespace
2800 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2802 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2804 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2805 errno value, causing getaddrinfo to fail
2806 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2807 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2808 instead of EAI_NODATA
2809 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2810 constant PTRACE_SEIZE_DEVEL
2811 [21930] math: C-only gcc builtins used in <math.h> isinf
2812 [21932] network: Unpaired __resolv_context_get in generic get*_r
2814 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2815 [21944] libc: sigval namespace
2816 [21951] localedata: Update hanzi collation by stroke
2817 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2818 sysdeps/x86_64/fpu/e_expf.S
2819 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2820 allocation in syscall loops)
2821 [21959] localedata: Fix Country name for xh_ZA
2822 [21960] localedata: Fix abmon for bem_ZM
2823 [21966] math: AVX2 mathvec functions use FMA without checking
2824 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2825 [21971] localedata: Added New Locale for mfe_MU
2826 [21972] libc: assert macro requires operator== (int) for its argument type
2827 [21973] math: [sparc] libm missing sqrtl compat symbol
2828 [21974] libc: Remove __bb_init_func and __bb_exit_func
2829 [21982] string: stratcliff.c: error: assuming signed overflow does not
2831 [21986] stdio: __guess_grouping is called incorrectly
2832 [21987] math: [sparc32] wrong bits/long-double.h installed
2833 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2835 [22022] localedata: Missing country_name for mni_IN
2836 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2838 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2840 [22026] locale: iconv_open: heap overflow on gconv_init failure
2841 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2842 [22035] math: [m68k] bits/math-inline.h macro namespace
2843 [22038] localedata: Fix abbreviated weeks and months for Somali
2844 [22044] localedata: Remove redundant data for Limburgish Language
2845 [22050] malloc: Linking with -lmcheck does not hook
2846 __malloc_initialize_hook correctly
2847 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2848 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2849 [22070] localedata: charmaps/UTF-8: wcwidth for
2850 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2851 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2852 Jungseong and Jongseong) should be 0
2853 [22078] nss: nss_files performance issue in multi mode
2854 [22082] math: bits/math-finite.h exp10 condition
2855 [22086] libc: pcprofiledump incorrect cross-endian condition
2856 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2857 [22095] network: Name server address allocation memory leak in resolv.conf
2859 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2861 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2862 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2864 [22111] malloc: malloc: per thread cache is not returned when thread exits
2865 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2866 [22134] libc: [linux] implement fexecve with execveat
2867 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2869 [22145] libc: ttyname() gives up too early in the face of namespaces
2870 [22146] math: C++ build issue with float128 on x86_64
2871 [22153] nptl: nptl: save error code before process termination
2872 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2873 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2874 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2875 [22165] libc: [hppa] Text relocations in libc.so
2876 [22180] libc: destructor registered via __cxa_atexit is called twice
2877 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2878 symlinks") cause "make" segfaults
2879 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2881 [22207] libc: FAIL: stdlib/test-atexit-race
2882 [22225] math: nearbyint arithmetic moved before feholdexcept
2883 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2884 [22235] math: iscanonical in C++ and float128
2885 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2886 the svid compat wrapper
2887 [22244] math: ynf and yn are wrong without the svid compat wrapper
2888 [22273] libc: Improper assert in Linux posix_spawn implementation
2889 [22284] libc: -pg -pie doesn't work
2890 [22292] locale: localedef exits with error 4 when it should be error 1
2891 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2892 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2894 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2895 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2897 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2898 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2899 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2900 [22322] libc: [mips64] wrong bits/long-double.h installed
2901 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2902 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2904 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2905 [22343] malloc: Integer overflow in posix_memalign
2906 [22347] libc: getrandom() returns the number of bytes that were copied to
2907 the buffer even though the comments say "Return 0 on success and -1 on
2909 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2910 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2912 [22370] dynamic-link: Incorrect note padding check
2913 [22375] libc: malloc returns pointer from tcache_get when should return
2914 NULL (CVE-2017-17426)
2915 [22377] math: iseqsig, float128 and C++
2916 [22382] localedata: Error in tpi_PG locale
2917 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2918 inside the ASCII printable range
2919 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2921 [22403] localedata: Slash needs escaping in some locales
2922 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2923 [22409] network: res_hnok does not accept some host names used on the
2925 [22412] network: res_dnok, res_hnok should perform syntax checks
2926 [22413] network: ns_name_pton ignores syntactically invalid trailing
2928 [22415] stdio: setvbuf can lead to invalid free/segfault
2929 [22432] build: Non-deterministic build
2930 [22439] malloc: malloc_info should compute summary statistics for all sub-
2932 [22442] network: if_nametoindex could report index for the wrong
2933 networking interface
2934 [22446] build: aliasing violation calling readlink in handle_request
2935 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2936 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2937 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2938 __nscd_hash/__nss_hash
2939 [22463] network: p_secstodate overflow handling
2940 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2941 [22478] libc: sigwait can fail with EINTR
2942 [22505] libc: ldconfig processes include directive in locale-specific
2944 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2945 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2946 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2947 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2948 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2949 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2950 same as for Croatian
2951 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2952 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2953 [22577] libc: missing newline after "cannot allocate TLS data structures
2955 [22588] manual: manual/conf.texi: missing underscore in front of
2957 [22593] math: nextafter and nexttoward are declared with const attribute
2958 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2959 [22603] string: ia64 memchr overflows internal pointer check
2960 [22605] libc: SH clone does not set the exit code correctly
2961 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2963 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2964 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2965 modified in case of success
2966 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2967 [22615] manual: manual: ambiguous wording about errno value in case of
2969 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2971 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2972 binaries or if /proc is not mounted (CVE-2017-16997)
2973 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2974 [22630] build: $(no-pie-ldflag) is no longer effective
2975 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2976 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2977 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2978 [22637] nptl: guard size is subtracted from thread stack size instead of
2980 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2981 [22657] localedata: hu_HU: Avoid double space in date
2982 [22660] math: fmax, fmin sNaN handling on alpha
2983 [22664] libc: New warning of GCC8
2984 [22665] math: alpha: ceil and floor raise inexact exceptions
2985 [22666] math: alpha: trunc raise inexact exceptions
2986 [22667] libc: makecontext lacks stack alignment on i386
2987 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2988 [22679] libc: getcwd(3) can succeed without returning an absolute path
2990 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2991 elision and tunables
2992 [22687] math: [powerpc-nofpu] complex long double functions spurious
2994 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2995 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2996 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2998 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2999 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3001 [22701] nis: Incomplete removal of libnsl
3002 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3003 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3004 [22715] dynamic-link: FAIL: elf/tst-audit10
3005 [22719] libc: Backtrace tests fail on hppa
3006 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3007 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3008 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3009 before the first call to crypt_r () in crypt/badsalttest.c
3016 * A per-thread cache has been added to malloc. Access to the cache requires
3017 no locks and therefore significantly accelerates the fast path to allocate
3018 and free small amounts of memory. Refilling an empty cache requires locking
3019 the underlying arena. Performance measurements show significant gains in a
3020 wide variety of user workloads. Workloads were captured using a special
3021 instrumented malloc and analyzed with a malloc simulator. Contributed by
3022 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3024 * Unicode 10.0.0 Support: Character encoding, character type info, and
3025 transliteration tables are all updated to Unicode 10.0.0, using
3026 generator scripts contributed by Mike FABIAN (Red Hat).
3027 These updates cause user visible changes, especially the changes in
3028 wcwidth for many emoji characters cause problems when emoji sequences
3029 are rendered with pango, see for example:
3030 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3032 * Collation of Hungarian has been overhauled and is now consistent with "The
3033 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3036 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3038 - The GNU C Library will now detect when /etc/resolv.conf has been
3039 modified and reload the changed configuration. The new resolver option
3040 “no-reload” (RES_NORELOAD) disables this behavior.
3042 - The GNU C Library now supports an arbitrary number of search domains
3043 (configured using the “search” directive in /etc/resolv.conf);
3044 previously, there was a hard limit of six domains. For backward
3045 compatibility, applications that directly modify the ‘_res’ global
3046 object are still limited to six search domains.
3048 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3049 Library will now randomly pick a name server from the configuration as a
3050 starting point. (Previously, the second name server was always used.)
3052 * The tunables feature is now enabled by default. This allows users to tweak
3053 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3055 * New function reallocarray, which resizes an allocated block (like realloc)
3056 to the product of two sizes, with a guaranteed clean failure upon integer
3057 overflow in the multiplication. Originally from OpenBSD, contributed by
3058 Dennis Wölfing and Rüdiger Sonderfeld.
3060 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3061 These are extended versions of preadv and pwritev, respectively, taking an
3062 additional flags argument. The set of supported flags depends on the
3063 running kernel; full support currently requires kernel 4.7 or later.
3065 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3066 create a new session ID for the spawned process. This feature is
3067 scheduled to be added to the next major revision of POSIX; for the time
3068 being, it is available under _GNU_SOURCE.
3070 * errno.h is now safe to use from C-preprocessed assembly language on all
3071 supported operating systems. In this context, it will only define the
3072 Exxxx constants, as preprocessor macros expanding to integer literals.
3074 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3075 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3076 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3077 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3079 To compile programs that use this feature, the compiler must support
3080 128-bit floating point with the type name _Float128 (as defined by TS
3081 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3082 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3083 must be defined to make the new interfaces visible.
3085 The new functions and macros correspond to those present for other
3086 floating-point types (except for a few obsolescent interfaces not
3087 supported for the new type), with F128 or f128 suffixes; for example,
3088 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3089 printf or scanf formats for the new type; the strfromf128 and strtof128
3090 interfaces should be used instead.
3092 Deprecated and removed features, and other changes affecting compatibility:
3094 * The synchronization that pthread_spin_unlock performs has been changed to
3095 now be equivalent to a C11 atomic store with release memory order to the
3096 spin lock's memory location. Previously, several (but not all)
3097 architectures used stronger synchronization (e.g., containing what is
3098 often called a full barrier). This change can improve performance, but
3099 may affect odd fringe uses of spin locks that depend on the previous
3100 behavior (e.g., using spin locks as atomic variables to try to implement
3101 Dekker's mutual exclusion algorithm).
3103 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3106 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3107 will only be built and installed when the GNU C Library is configured with
3108 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3109 as TIRPC or rpcsvc-proto, to be used.
3111 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3112 libnss_compat, are deprecated, and will not be built or installed by
3115 The NIS(+) support library, libnsl, is also deprecated. By default, a
3116 compatibility shared library will be built and installed, but not headers
3117 or development libraries. Only a few NIS-related programs require this
3118 library. (In particular, the GNU C Library has never required programs
3119 that use 'gethostbyname' to be linked with libnsl.)
3121 Replacement implementations based on TIRPC, which additionally support
3122 IPv6, are available from <https://github.com/thkukuk/>. The configure
3123 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3124 name service modules, to be built and installed.
3126 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3127 support is enabled, the configured recursive resolver must support EDNS.
3128 (Responding to EDNS-enabled queries with responses which are not
3129 EDNS-enabled is fine, but FORMERR responses are not.)
3131 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3132 servers have not supported this opcode for a long time.
3134 * The _res_opcodes variable has been removed from libresolv. It had been
3135 exported by accident.
3137 * <string.h> no longer includes inline versions of any string functions,
3138 as this kind of optimization is better done by the compiler. The macros
3139 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3141 * The nonstandard header <xlocale.h> has been removed. Most programs should
3142 use <locale.h> instead. If you have a specific need for the definition of
3143 locale_t with no other declarations, please contact
3144 libc-alpha@sourceware.org and explain.
3146 * The obsolete header <sys/ultrasound.h> has been removed.
3148 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3150 * The obsolete function cfree has been removed. Applications should use
3153 * The stack_t type no longer has the name struct sigaltstack. This changes
3154 the C++ name mangling for interfaces involving this type.
3156 * The ucontext_t type no longer has the name struct ucontext. This changes
3157 the C++ name mangling for interfaces involving this type.
3159 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3160 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3161 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3162 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3163 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3164 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3165 fpregset_t type no longer has the name struct fpu. This changes the C++
3166 name mangling for interfaces involving those types.
3168 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3169 synced with the kernel:
3171 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3172 are not supported on this architecture and have been removed.
3174 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3175 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3176 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3178 Programs that assume the GET/SETREGS ptrace requests are universally
3179 available will now fail to build, instead of malfunctioning at runtime.
3181 Changes to build and runtime requirements:
3183 * Linux kernel 3.2 or later is required at runtime, on all architectures
3184 supported by that kernel. (This is a change from version 2.25 only for
3187 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3189 * On most architectures, GCC 4.9 or later is required to build the GNU C
3190 Library. On powerpc64le, GCC 6.2 or later is required.
3192 Older GCC versions and non-GNU compilers are still supported when
3193 compiling programs that use the GNU C Library. (We do not know exactly
3194 how old, and some GNU extensions to C may be _de facto_ required. If you
3195 are interested in helping us make this statement less vague, please
3196 contact libc-alpha@sourceware.org.)
3198 Security related changes:
3200 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3201 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3203 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3204 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3206 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3207 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3210 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3211 fixed (CVE-2017-12133).
3213 The following bugs are resolved with this release:
3215 [984] network: Respond to changed resolv.conf in gethostbyname
3216 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3217 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3219 [12189] libc: __stack_chk_fail should not attempt a backtrace
3221 [14096] time: Race condition on timezone/tst-timezone.out
3222 [14172] localedata: az_IR: new locale
3223 [14995] build: glibc fails to build if gold is the default linker, even if
3225 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3226 [16637] network: inet_pton function is accepting IPv6 with bad format
3227 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3228 x86 and other generic code
3229 [16875] localedata: ko_KR: fix lang_name
3230 [17225] localedata: ar_SY: localized month names for May and June are
3232 [17297] localedata: da_DK: wrong date_fmt string
3233 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3234 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3235 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3236 [19066] localedata: ar_SA abbreviated day and month names are in English
3237 [19569] network: resolv: Support an arbitrary number of search domains
3238 [19570] network: Implement random DNS server selection in the stub
3240 [19838] locale: localedef fails on PA-RISC
3241 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3242 order of 0D36 and 0D37
3243 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3245 [20098] libc: FAIL: debug/backtrace-tst on hppa
3246 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3248 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3250 [20313] localedata: Update locale data to Unicode 9.0
3251 [20424] manual: Document how to provide a malloc replacement
3252 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3254 [20686] locale: Add el_GR@euro to SUPPORTED.
3255 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3256 failures consistently
3257 [21015] dynamic-link: Document and fix --enable-bind-now
3258 [21016] nptl: pthread_cond support is broken on hppa
3259 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3260 frame-pointer on i386
3261 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3263 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3264 [21088] libc: Build fails with --enable-static-nss
3265 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3266 generic c code is used
3267 [21109] libc: Tunables broken on big-endian
3268 [21112] math: powf has large ulp errors with base close to 1 and exponent
3270 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3272 [21120] malloc: glibc malloc is incompatible with GCC 7
3273 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3275 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3276 (-0.0) when linking with -lieee
3277 [21171] math: log10, log2 and lgamma return incorrect results
3278 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3279 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3280 [21207] localedata: ce_RU: update weekdays from CLDR
3281 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3282 [21217] localedata: Update months from CLDR-31
3283 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3284 [21243] libc: support_delete_temp_file should issue warning for failed
3286 [21244] libc: support resolv_test_start() socket fd close should be
3288 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3289 new posix_spawn implementation
3290 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3291 leads to lower CPU frequency
3292 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3293 [21261] libc: [sparc64] bits/setjmp.h namespace
3294 [21267] network: [mips] bits/socket.h IOC* namespace
3295 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3296 [21270] libc: mmap64 silently truncates large offset values
3297 [21275] libc: posix_spawn always crashes on ia64 now
3298 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3299 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3300 [21289] libc: Incorrect declaration for 32-bit platforms with
3301 _FILE_OFFSET_BITS=64 causes build error
3302 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3303 not support gethostbyname4_r
3304 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3306 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3308 [21340] libc: Support POSIX_SPAWN_SETSID
3309 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3310 [21359] network: ns_name_pack needs additional byte in destination buffer
3311 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3312 against fragmentation attacks (CVE-2017-12132)
3313 [21369] network: resolv: Remove EDNS fallback
3314 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3316 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3317 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3318 [21393] stdio: Missing dup3 error check in freopen, freopen64
3319 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3320 [21399] localedata: Bad description for U00EC in
3321 localedata/charmaps/CP1254
3322 [21411] malloc: realloc documentation error
3323 [21426] network: sys/socket.h uio.h namespace
3324 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3325 [21445] libc: signal.h bsd_signal namespace
3326 [21455] network: Network headers stdint.h namespace
3327 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3329 [21475] network: resolv: Overlong search path is truncated mid-label
3330 [21511] libc: sigstack namespace
3331 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3332 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3333 bits/syscall.h: No such file or directory
3334 [21517] libc: struct sigaltstack namespace
3335 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3336 [21533] localedata: Update locale data to Unicode 10.0
3338 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3339 junk at end of line, first unrecognized character is `@'
3340 [21538] libc: SIG_HOLD missing for XPG4
3341 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3342 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3343 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3344 [21543] libc: sigevent namespace
3345 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3346 size for general purpose registers in mcontext_t structure
3347 [21550] libc: sigwait namespace
3348 [21552] libc: XPG4 bsd_signal namespace
3349 [21554] libc: sigpause namespace
3350 [21560] libc: sys/wait.h signal.h namespace
3351 [21561] libc: waitid namespace
3352 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3353 '/usr/include/stdlib.h': Permission denied
3354 [21575] libc: sys/wait.h missing struct rusage definition
3355 [21584] libc: sigaltstack etc namespace
3356 [21597] libc: siginterrupt namespace
3357 [21607] math: hppa: FAIL: math/test-tgmath
3358 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3360 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3361 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3362 stack and heap (CVE-2017-1000366)
3363 [21625] libc: wait3 namespace
3364 [21654] nss: Incorrect pointer alignment in NSS group merge result
3366 [21657] network: Parse interface zone id for node-local multicast
3367 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3369 [21666] libc: .symver is used on common symbol
3370 [21668] network: resolv: res_init cross-thread broadcast introduces race
3372 [21687] math: tgmath.h totalorder, totalordermag return type
3373 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3375 [21696] libc: Incorrect assumption of of __cpu_mask in
3376 posix/sched_cpucount.c
3377 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3378 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3380 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3381 leading to relocation crash
3382 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3383 `resolv_conf_matches (resp, conf)' failed.
3384 [21710] localedata: Added Samoan language locale for Samoa
3385 [21711] localedata: Pashto yesstr/nostr locale are missing
3386 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3387 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3388 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3389 [21723] localedata: yesstr/nostr missing for Chinese language locale
3390 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3392 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3394 [21728] localedata: New Locale for Tongan language
3395 [21729] localedata: incorrect LC_NAME fields for hi_IN
3396 [21733] localedata: yesstr and nostr are missing for zh_HK
3397 [21734] localedata: Missing yesstr and nostr are for kw_GB
3398 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3399 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3400 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3401 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3403 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3405 [21749] localedata: Wrong abbreviated day name (“abday”) for
3407 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3408 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3409 [21759] localedata: missing yesstr and nostr for Tigrinya
3410 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3411 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3412 [21767] localedata: Missing Bislama locales
3413 [21768] localedata: Missing yesstr and nostr for aa_ET
3414 [21770] localedata: Missing Field in li_NL
3415 [21778] nptl: Robust mutex may deadlock
3416 [21779] libc: MicroBlaze segfaults when loading libpthread
3417 [21783] localedata: Fix int_select international_call_prefixes
3418 [21784] localedata: Inconsistency in country_isbn
3419 [21788] localedata: Missing Country Postal Abbreviations
3420 [21794] localedata: Added-country_isbn-for-Italy
3421 [21795] localedata: Add/Fix country_isbn for France
3422 [21796] localedata: Added country_isbn for Republic of Korea
3423 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3424 [21799] localedata: Added int_select international_call_prefixes
3425 [21801] localedata: Added int_select international_call_prefixes
3426 [21804] nptl: Double semicolon in thread-shared-types.h
3427 [21807] localedata: LC_ADDRESS fix for pap_CW
3428 [21808] localedata: Fix LC_ADDRESS for pap_AW
3429 [21821] localedata: Added country_name in mai_IN
3430 [21822] localedata: Fix LC_TIME for mai_IN
3431 [21823] localedata: missing yesstr, nostr for sa_IN
3432 [21825] localedata: Fix name_mrs for mag_IN
3433 [21828] localedata: 2.26 changelog should mention user visible changes
3435 [21835] localedata: Added Maithili language locale for Nepal
3436 [21838] localedata: Removed redundant data for the_NP
3437 [21839] localedata: Fix LC_MONETARY for ta_LK
3438 [21844] localedata: Fix Latin characters and Months Sequence.
3439 [21848] localedata: Fix mai_NP Title Name
3444 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3445 24731-2:2010, is supported to enable declarations of functions from that
3446 TR. Note that not all functions from that TR are supported by the GNU C
3449 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3450 18661-1:2014, is supported to enable declarations of functions and macros
3451 from that TS. Note that not all features from that TS are supported by
3454 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3455 18661-4:2015, is supported to enable declarations of functions and macros
3456 from that TS. Note that most features from that TS are not supported by
3459 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3460 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3461 Since the GNU C Library defaults to a much newer revision of POSIX, this
3462 will only affect programs that specifically request an old conformance
3463 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3464 see a change in the visible declarations, but a program compiled with
3465 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3468 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3469 defined by all multithreaded code, but glibc has not required this for
3472 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3473 means that in a future release, the macros “major”, “minor”, and “makedev”
3474 will only be available from <sys/sysmacros.h>.
3476 These macros are not part of POSIX nor XSI, and their names frequently
3477 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3478 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3479 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3482 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3483 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3484 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3486 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3487 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3488 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3489 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3490 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3491 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3492 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3493 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3494 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3495 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3496 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3499 * New <math.h> features are added from TS 18661-1:2014:
3501 - Signaling NaN macros: SNANF, SNAN, SNANL.
3503 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3504 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3505 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3507 - llogb functions: the llogb, llogbf and llogbl functions, and the
3508 FP_LLOGB0 and FP_LLOGBNAN macros.
3510 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3513 - Comparison macros: iseqsig.
3515 - Classification macros: iscanonical, issubnormal, iszero.
3517 - Total order functions: totalorder, totalorderf, totalorderl,
3518 totalordermag, totalordermagf, totalordermagl.
3520 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3522 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3523 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3525 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3526 are added to libc. They convert a floating-point number into string.
3528 * Most of glibc can now be built with the stack smashing protector enabled.
3529 It is recommended to build glibc with --enable-stack-protector=strong.
3530 Implemented by Nick Alcock (Oracle).
3532 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3533 intended to be used instead of memset() to erase sensitive data after use;
3534 the compiler will not optimize out calls to explicit_bzero even if they
3535 are "unnecessary" (in the sense that no _correct_ program can observe the
3536 effects of the memory clear).
3538 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3539 to float instead of double. This does not affect the ABI of any libraries
3540 that are part of the GNU C Library, but may affect the ABI of other
3541 libraries that use this type in their interfaces.
3543 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3544 float_t and double_t types are now defined to long double instead of float
3545 and double. These options are not the default, and this does not affect
3546 the ABI of any libraries that are part of the GNU C Library, but it may
3547 affect the ABI of other libraries that use this type in their interfaces,
3548 if they are compiled or used with those options.
3550 * The getentropy and getrandom functions, and the <sys/random.h> header file
3553 * The buffer size for byte-oriented stdio streams is now limited to 8192
3554 bytes by default. Previously, on Linux, the default buffer size on most
3555 file systems was 4096 bytes (and thus remains unchanged), except on
3556 network file systems, where the buffer size was unpredictable and could be
3557 as large as several megabytes.
3559 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3560 for the Linux quota interface which predates kernel version 2.4.22 has
3563 * The malloc_get_state and malloc_set_state functions have been removed.
3564 Already-existing binaries that dynamically link to these functions will
3565 get a hidden implementation in which malloc_get_state is a stub. As far
3566 as we know, these functions are used only by GNU Emacs and this change
3567 will not adversely affect already-built Emacs executables. Any undumped
3568 Emacs executables, which normally exist only during an Emacs build, should
3569 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3571 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3572 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3573 “no-ip6-dotint” had already been the default, and support for the
3574 “ip6-dotint” option was removed from the Internet in 2006.
3576 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3577 flag from <resolv.h> have been removed. The option relied on a
3578 backwards-incompatible DNS extension which was never deployed on the
3581 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3582 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3583 They were already unimplemented.
3585 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3586 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3587 removed again from the IETF name lookup interface specification in RFC
3588 2553. Applications should use getaddrinfo instead.
3590 * DNSSEC-related declarations and definitions have been removed from the
3591 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3592 decode the data part of DNSSEC record types. Previous versions of glibc
3593 only implemented minimal support for the previous version of DNSSEC, which
3594 is incompatible with the currently deployed version.
3596 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3597 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3598 <arpa/nameser.h> header file because the distinction between RR types and
3599 meta-RR types is not officially standardized, subject to revision, and
3600 thus not suitable for encoding in a macro.
3602 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3603 and rhook members of the res_state type in <resolv.h> have been removed.
3604 The glibc stub resolver did not support these hooks, but the header file
3605 did not reflect that.
3607 * For multi-arch support it is recommended to use a GCC which has
3608 been built with support for GNU indirect functions. This ensures
3609 that correct debugging information is generated for functions
3610 selected by IFUNC resolvers. This support can either be enabled by
3611 configuring GCC with '--enable-gnu-indirect-function', or by
3612 enabling it by default by setting 'default_gnu_indirect_function'
3613 variable for a particular architecture in the GCC source file
3616 * GDB pretty printers have been added for mutex and condition variable
3617 structures in POSIX Threads. When installed and loaded in gdb these pretty
3618 printers show various pthread variables in human-readable form when read
3619 using the 'print' or 'display' commands in gdb.
3621 * Tunables feature added to allow tweaking of the runtime for an application
3622 program. This feature can be enabled with the '--enable-tunables' configure
3623 flag. The GNU C Library manual has details on usage and README.tunables has
3624 instructions on adding new tunables to the library.
3626 * A new version of condition variables functions have been implemented in
3627 the NPTL implementation of POSIX Threads to provide stronger ordering
3630 * A new version of pthread_rwlock functions have been implemented to use a more
3631 scalable algorithm primarily through not using a critical section anymore to
3634 Security related changes:
3636 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3637 have been created with makecontext could fail to terminate due to a
3638 missing .cantunwind annotation. This has been observed to lead to a hang
3639 (denial of service) in some Go applications compiled with gccgo. Reported
3640 by Andreas Schwab. (CVE-2016-6323)
3642 * The DNS stub resolver functions would crash due to a NULL pointer
3643 dereference when processing a query with a valid DNS question type which
3644 was used internally in the implementation. The stub resolver now uses a
3645 question type which is outside the range of valid question type values.
3648 The following bugs are resolved with this release:
3650 [4099] stdio: Overly aggressive caching by stream i/o functions.
3651 [7065] build: Support building glibc with -fstack-protector or -fstack-
3653 [9842] localedata: en_CA: incorrect date format
3654 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3655 before it started waiting
3656 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3657 [15765] nptl: sem_open is wrongly a cancellation point
3658 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3659 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3661 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3662 library linked with pthread
3663 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3664 "FIXME: Ingo" issue)
3665 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3666 [17252] libc: getrandom and getentropy syscall
3667 [17730] malloc: thread-local storage is sometimes improperly free()'d
3668 after being __libc_memalign()'d
3669 [18241] stdio: failed fseek on memstream does not set errno and can fail
3671 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3673 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3674 PTHREAD_PRIO_INHERIT mutex on ARM
3675 [18784] network: res_query and related function crash for special record
3676 type queries (CVE-2015-5180)
3677 [19380] math: strtod does not raise "inexact"
3678 [19387] string: Integer overflow in memchr
3679 [19390] string: Integer overflow in strncat
3680 [19398] build: linknamespace tests fail with massively parallel build
3681 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3683 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3684 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3685 [19514] libc: [PATCH] Fix spelling errors in spelling
3686 "implement"/"implementation" in several places
3687 [19582] network: Deprecate RES_USE_INET6
3688 [19673] manual: clog10 docs appear to be erroneous
3689 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3690 causes a segmentation fault
3691 [19826] libc: invalid pointer returned from __tls_get_addr with static
3693 [20016] network: resolv: Remove hooks support from the API
3694 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3696 [20033] math: [x86_64] vectorized math function don't call the __finite
3698 [20116] nptl: use after free in pthread_create
3699 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3700 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3702 [20311] nptl: please install proc_service.h
3703 [20366] libc: Compilation errors in installed headers in strict-compliance
3705 [20370] malloc: malloc: Arena free list management is still racy
3706 (incorrect fix in bug 19243)
3707 [20386] libc: assert (X = 0) does not result in GCC warning
3708 [20432] malloc: malloc: Minimize interface required for interposition
3709 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3710 in _Unwind_Backtrace (CVE-2016-6323)
3711 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3712 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3714 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3715 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3716 [20477] network: resolv: incorrect double-checked locking related to
3718 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3720 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3722 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3723 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3724 cause transition penalty
3725 [20517] math: sparcv9 missing fdiml compat symbol
3726 [20524] manual: strverscmp is inconsistent
3727 [20525] libc: <sys/quota.h> should be based on kernel headers
3728 [20539] math: GCC 7 -static -lm fails to link at -O3
3729 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3731 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3733 [20591] network: Remove obsolete DNSSEC support
3734 [20592] network: DNS resource record type classification macros in
3735 <arpa/nameser.h> are incorrect
3736 [20593] network: Update DNS RR type definitions
3737 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3738 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3740 [20629] network: libresolv: Remove support for bitstring labels
3742 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3743 assertion: "maxidx >= 2"
3744 [20660] math: [arm] Use VSQRT
3745 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3746 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3747 [20689] libc: Test for FMA should also check for AVX.
3748 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3749 [20715] math: iszero macro breaks existing code
3750 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3751 [20728] libc: powerpc: Missing TOC stub in clone
3752 [20729] build: glibc-2.24 fails to build for i486 with -Os
3753 [20750] build: Build fails with default PIE enabled gcc-6.x
3754 [20768] math: [alpha] sqrt fegetenv namespace
3755 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3757 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3758 __FLT_EVAL_METHOD__ is 2
3759 [20790] network: rpcgen buffer overrun in get_prog_declaration
3760 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3761 [20829] libc: crypt snprintf namespace
3762 [20847] libc: tst-vfork3 failure
3763 [20855] math: Default bits/mathdef.h has inappropriate float_t
3764 [20859] math: [sh4] FP_ILOGB0 invalid
3765 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3766 U+20AC), not same as GBK
3767 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3768 [20916] math: pow handling of sNaN arguments
3769 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3770 [20919] math: Bad pow (qNaN, 0) result with -lieee
3771 [20940] math: hypot sNaN handling
3772 [20947] math: fmax, fmin sNaN handling
3773 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3774 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3776 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3777 [20973] nptl: robust mutexes: Lost wake-ups
3778 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3779 [20978] nis: strlen on null pointer in nss_nisplus
3780 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3782 [21014] string: i686 memchr overflows internal pointer check
3783 [21019] libc: [mips] n32 lseek incorrect on overflow
3784 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3785 [21026] libc: [MIPS] readahead syscall is broken on n64
3786 [21028] math: Fallback fesetexceptflag should always succeed
3787 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3788 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3790 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3791 [21061] librt: [microblaze] librt lost clock_* exports
3792 [21073] libc: tunables: insecure environment variables passed to
3793 subprocesses with AT_SECURE
3794 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3798 * The minimum Linux kernel version that this version of the GNU C Library
3799 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3800 kernel version 2.6.32 or later suffices (on architectures that already
3801 required kernel versions more recent than 3.2, those requirements remain
3802 unchanged). Linux 3.2 or later kernel headers are required on all
3805 * The pap_AN locale has been deleted. This has been deprecated for a long
3806 time. It has been replaced by pap_AW & pap_CW, both of which have long
3807 been included in previous releases.
3809 * The readdir_r and readdir64_r functions have been deprecated. It is
3810 recommended to use readdir and readdir64 instead.
3812 * The type “union wait” has been removed. It was deprecated in the early
3813 1990s and never part of POSIX. Application code should use the int type
3814 instead of “union wait”.
3816 * A new NSS action is added to facilitate large distributed system
3817 administration. The action, MERGE, allows remote user stores like LDAP
3818 to be merged into local user stores like /etc/groups in order to provide
3819 easy to use, updated, and managed sets of merged credentials. The new
3820 action can be used by configuring it in /etc/nsswitch.conf:
3821 group: files [SUCCESS=merge] nis
3822 Implemented by Stephen Gallagher (Red Hat).
3824 * The deprecated __malloc_initialize_hook variable has been removed from the
3827 * The long unused localedef --old-style option has been removed. It hasn't
3828 done anything in over 16 years. Scripts using this option can safely
3831 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3832 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3833 return the next representable value in the direction of positive infinity
3834 and the nextdown functions return the next representable value in the
3835 direction of negative infinity. These are currently enabled as GNU
3838 Security related changes:
3840 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3841 could result in a stack overflow when getnetbyname was called with an
3842 overly long name. (CVE-2016-3075)
3844 * Previously, getaddrinfo copied large amounts of address data to the stack,
3845 even after the fix for CVE-2013-4458 has been applied, potentially
3846 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3847 instead. Reported by Michael Petlan. (CVE-2016-3706)
3849 * The glob function suffered from a stack-based buffer overflow when it was
3850 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3851 Reported by Alexander Cherepanov. (CVE-2016-1234)
3853 * The Sun RPC UDP client could exhaust all available stack space when
3854 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3855 alloca plugin for GCC. (CVE-2016-4429)
3857 * The IPv6 name server management code in libresolv could result in a memory
3858 leak for each thread which is created, performs a failing naming lookup,
3859 and exits. Over time, this could result in a denial of service due to
3860 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3862 The following bugs are resolved with this release:
3864 [1170] localedata: ne_NP: update Nepali locale definition file
3865 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3867 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3868 [6796] math: fdim() does not set errno on overflow
3869 [10354] libc: posix_spawn should use vfork() in more cases than presently
3870 [11213] localedata: localedata: add copyright disclaimer to locale files
3871 [12143] localedata: chr_US: new Cherokee locale
3872 [12450] localedata: sgs_LT: new locale
3873 [12676] localedata: ln_CD: new locale
3874 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3876 [13304] math: fma, fmaf, fmal produce wrong results
3877 [14259] build: --localedir arg to configure is ignored
3878 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3879 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3880 [14934] localedata: es_CL: wrong first weekday chilean locale
3881 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3883 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3885 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3886 [15368] nptl: raise() is not async-signal-safe
3887 [15479] math: ceil, floor, round and trunc raise inexact exception
3888 [15578] localedata: kk_KZ: various updates
3889 [16003] localedata: pap_AN: punt old locale
3890 [16137] localedata: iw_IL: punt old locale
3891 [16190] localedata: eo: new esperanto locale
3892 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3893 [16742] malloc: race condition: pthread_atfork() called before first
3894 malloc() results in unexpected locking behaviour/deadlocks
3895 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3897 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3898 [17565] localedata: pt_PT: wrong (work-)week start
3899 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3900 [17950] build: Build fails with -msse
3901 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3902 [18433] libc: posix_spawn does not return correctly upon failure to
3904 [18453] localedata: charmaps/IBM875: incorrect codes
3905 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3907 [18896] localedata: he_IL: improvements for currency
3908 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3909 Romanian locale data
3910 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3912 [19056] libc: Deprecate readdir_r
3913 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3915 [19198] localedata: nl_NL: small improvements for Dutch locales
3916 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3917 nameservers (CVE-2016-5417)
3918 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3920 [19400] locale: Language missing in "iso-639.def", trivial fix in
3922 [19431] malloc: Deadlock between fflush, getdelim, and fork
3923 [19505] libc: Incorrect file descriptor validity checks in
3924 posix_spawn_file_actions_add{open,close,dup2}
3925 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3926 when using RTLD_NEXT
3927 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3928 `intl/{gettextP,loadinfo}.h'
3929 [19534] libc: execle, execlp may use malloc
3930 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3931 [19573] network: res_nclose and __res_maybe_init disagree about name
3932 server initialization, breaking Hesiod
3933 [19575] localedata: Status of GB18030 tables
3934 [19581] localedata: sr_* date_fmt string contains additional newline
3935 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3937 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3938 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3939 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3940 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3942 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3944 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3946 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3947 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3948 [19633] locale: strfmon_l applies global locale to number formatting
3949 [19642] network: Memory leak in getnameinfo
3950 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3951 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3953 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3954 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3956 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3957 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3959 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3961 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3963 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3964 pointers and lengths in error-case.
3965 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3966 report errors on UTF-16 surrogates values.
3967 [19755] nscd: nscd assertion failure in gc
3968 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3969 [19759] libc: mempcpy shouldn't be inlined
3970 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3971 [19765] libc: s390 needs an optimized mempcpy
3972 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3973 NAME_MAX limit assumption (CVE-2016-1234)
3974 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3975 [19787] network: Missing and incorrect truncation checks in getnameinfo
3976 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3978 [19791] network: Assertion failure in res_query.c with un-connectable name
3980 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3981 [19822] math: libm.so install clobbers old version
3982 [19825] network: resolv: send_vc can return uninitialized data in second
3983 response to getaddrinfo
3984 [19830] network: nss_dns: should check RDATA length against buffer length
3985 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3986 confronted with A/AAAA records of invalid size
3987 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3988 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3989 [19853] stdio: Printing IBM long double in decimal with high precision is
3991 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3992 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3993 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3995 [19865] network: Assertion failure or memory leak in
3996 _nss_dns_getcanonname_r
3997 [19868] network: nss_dns: netent code does not skip over non-PTR records
3998 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4000 [19881] string: Improve x86-64 memset
4001 [19907] string: Incorrect memcpy tests
4002 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4004 [19925] libc: termios.h XCASE namespace
4005 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4006 [19929] libc: limits.h NL_NMAX namespace
4007 [19931] stdio: Memory leak in vfprintf
4008 [19957] libc: clone(CLONE_VM) access invalid parent memory
4009 [19963] localedata: en_IL: New locale
4010 [19989] stdio: stdio.h cuserid namespace
4011 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4013 [19996] locale: langinfo.h nl_langinfo_l namespace
4014 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4015 [20010] network: getaddrinfo: Stack overflow in hostent translation
4017 [20012] stdio: libio: fmemopen append mode failure
4018 [20014] stdio: stdio.h namespace for pre-threads POSIX
4019 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4020 [20023] libc: fcntl.h timespec namespace
4021 [20024] math: [x86_64] vectorized sincos trashes the stack
4022 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4023 [20041] time: sys/time.h timespec namespace
4024 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4025 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4026 [20051] libc: ttyslot in wrong header under wrong conditions
4027 [20054] libc: gethostname not declared for XPG4
4028 [20055] libc: termios.h missing tcgetsid for XPG4
4029 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4031 [20073] libc: sys/stat.h fchmod namespace
4032 [20074] libc: stdlib.h rand_r namespace
4033 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4034 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4036 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4037 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4039 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4040 [20119] libc: Wrong mask for processors level type from CPUID
4041 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4042 AS not supporting AVX512
4043 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4045 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4046 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4048 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4049 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4050 [20178] libc: posix_spawn{p} should not call exit
4051 [20191] stdio: libio: vtables hardening
4052 [20195] string: FMA4 detection requires CPUID execution with register
4054 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4055 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4057 [20212] math: acos (sNaN) returns sNaN
4058 [20213] math: asin (sNaN) returns sNaN
4059 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4060 [20218] math: [i386] asinhl (sNaN) returns sNaN
4061 [20219] math: [i386] atanhl (sNaN) returns sNaN
4062 [20222] stdio: fopencookie: Mangle function pointers
4063 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4064 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4065 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4067 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4068 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4069 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4070 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4071 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4072 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4073 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4074 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4075 [20240] math: modf (sNaN) returns sNaN
4076 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4077 [20250] math: frexp (sNaN) returns sNaN
4078 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4079 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4081 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4082 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4083 subscript is below array bounds [-Werror=array-bounds]
4084 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4085 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4087 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4088 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4090 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4091 "invalid" exceptions
4092 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4093 [20316] localedata: id_ID: Februari instead of Pebruari
4094 [20327] string: POWER8 strcasecmp returns incorrect result
4095 [20347] math: Failure: Test: j0_downward (0xap+0)
4096 [20348] libc: FAIL: misc/tst-preadvwritev64
4097 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4098 [20350] libc: There is no test for p{read,write}64
4099 [20357] math: Incorrect cos result for 1.5174239687223976
4100 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4104 * Unicode 8.0.0 Support: Character encoding, character type info, and
4105 transliteration tables are all updated to Unicode 8.0.0, using new
4106 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4107 These updates cause user visible changes, such as the fixes for bugs
4108 89, 16061, and 18568.
4110 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4111 kernel-internal CPU set size. This means that requests that change the
4112 CPU affinity which failed before (for example, an all-ones CPU mask) will
4113 now succeed. Applications that need to determine the effective CPU
4114 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4115 setting it because the kernel can adjust it (and the previous size check
4116 would not detect this in the majority of cases).
4118 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4119 the following new symbols are used: fts64_children, fts64_close,
4120 fts64_open, fts64_read and fts64_set.
4122 * getaddrinfo now detects certain invalid responses on an internal netlink
4123 socket. If such responses are received, an affected process will
4124 terminate with an error message of "Unexpected error <number> on netlink
4125 descriptor <number>" or "Unexpected netlink response of size <number> on
4126 descriptor <number>". The most likely cause for these errors is a
4127 multi-threaded application which erroneously closes and reuses the netlink
4128 file descriptor while it is used by getaddrinfo.
4130 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4131 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4132 unnecessary serialization of memory allocation requests across threads.
4133 The defect is now corrected. Users should see a substantial increase in
4134 the concurent throughput of allocation requests for applications which
4135 trigger this bug. Affected applications typically create and
4136 destroy threads frequently. (Bug 19048 was reported and analyzed by
4139 * There is now a --disable-timezone-tools configure option for disabling the
4140 building and installing of the timezone related utilities (zic, zdump, and
4141 tzselect). This is useful for people who build the timezone data and code
4142 independent of the GNU C Library.
4144 * The obsolete header <regexp.h> has been removed. Programs that require
4145 this header must be updated to use <regex.h> instead.
4147 * The obsolete functions bdflush, create_module, get_kernel_syms,
4148 query_module and uselib are no longer available to newly linked binaries;
4149 the header <sys/kdaemon.h> has been removed. These functions and header
4150 were specific to systems using the Linux kernel and could not usefully be
4151 used with the GNU C Library on systems with version 2.6 or later of the
4154 * Optimized string, wcsmbs and memory functions for IBM z13.
4155 Implemented by Stefan Liebler.
4157 * Newly linked programs that define a variable called signgam will no longer
4158 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4159 require signgam to be set by those functions must ensure that they use the
4160 variable provided by the GNU C Library and declared in <math.h>, without
4161 defining their own copy.
4163 * The minimum GCC version that can be used to build this version of the GNU
4164 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4165 still be used to compile programs using the GNU C Library.
4167 Security related changes:
4169 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4170 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4172 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4173 the pointer guard feature. It is always enabled. Previously,
4174 LD_POINTER_GUARD could be used to disable security hardening in binaries
4175 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4178 * An integer overflow in hcreate and hcreate_r could lead to an
4179 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4181 * The catopen function no longer has unbounded stack usage. Reported by
4182 Max. (CVE-2015-8779)
4184 * The nan, nanf and nanl functions no longer have unbounded stack usage
4185 depending on the length of the string passed as an argument to the
4186 functions. Reported by Joseph Myers. (CVE-2014-9761)
4188 * A stack-based buffer overflow was found in libresolv when invoked from
4189 libnss_dns, allowing specially crafted DNS responses to seize control
4190 of execution flow in the DNS client. The buffer overflow occurs in
4191 the functions send_dg (send datagram) and send_vc (send TCP) for the
4192 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4193 family. The use of AF_UNSPEC triggers the low-level resolver code to
4194 send out two parallel queries for A and AAAA. A mismanagement of the
4195 buffers used for those queries could result in the response of a query
4196 writing beyond the alloca allocated buffer created by
4197 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4198 the overflow. Thanks to the Google Security Team and Red Hat for
4199 reporting the security impact of this issue, and Robert Holiday of
4200 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4202 The following bugs are resolved with this release:
4204 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4205 [887] math: Math library function "logb" and "nextafter" inconsistent
4206 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4207 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4208 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4209 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4211 [4404] localedata: German translation of "Alarm clock" is misleading
4212 [6799] math: nextafter() and nexttoward() doen't set errno on
4213 overflow/underflow errors
4214 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4216 [10432] nis: _nss_nis_setnetgrent assertion failure
4217 [11460] libc: fts has no LFS support
4218 [12926] network: getaddrinfo()/make_request() may spin forever
4219 [13065] nptl: Race condition in pthread barriers
4220 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4221 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4223 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4224 [14912] libc: Rename non-installed bits/*.h headers
4225 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4226 [15367] math: Let gcc use __builtin_isinf
4227 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4228 [15421] math: lgamma wrongly sets signgam for ISO C
4229 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4230 FE_INVALID with argument out of range
4231 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4233 [15786] dynamic-link: ifunc resolver functions can smash function
4235 [15918] math: Unnecessary check for equality in hypotf()
4236 [16061] localedata: Review / update transliteration data
4237 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4239 [16141] time: strptime %z offset restriction
4240 [16171] math: drem should be alias of remainder
4241 [16296] math: fegetround is pure?
4242 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4243 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4245 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4246 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4248 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4249 "Exception "Inexact" set" on ppc32
4250 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4251 [16517] math: Missing underflow exception from tanf/tan/tanl
4252 [16519] math: Missing underflow exception from sinhf
4253 [16520] math: Missing underflow exception from tanhf
4254 [16521] math: Missing underflow exception from exp2
4255 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4257 [16734] stdio: fopen calls mmap to allocate its buffer
4258 [16961] math: nan function incorrect handling of bad sequences
4259 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4260 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4261 [16985] locale: localedef: confusing error message when opening output
4263 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4264 [17197] locale: Redundant shift character in iconv conversion output at
4266 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4267 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4268 [17250] dynamic-link: static linking breaks nss loading
4269 (getaddrinfo/getpwnam/etc...)
4270 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4272 [17441] math: isnan() should use __builtin_isnan() in GCC
4273 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4274 (related to lock elision)
4275 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4276 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4277 [17887] time: strptime should be able to parse "+01:00" style timezones
4278 [17905] libc: catopen() Multiple unbounded stack allocations
4280 [18084] libc: backtrace (..., 0) dumps core on x86
4281 [18086] libc: nice() sets errno to 0 on success
4282 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4283 is too large (CVE-2015-8778)
4284 [18251] dynamic-link: SONAME missing when audit modules provides path
4285 [18265] libc: add attributes for wchar string and memory functions
4286 [18370] math: csqrt missing underflows
4287 [18421] libc: [hppa] read-only segment has dynamic relocations
4288 [18472] libc: Obsolete syscall wrappers should be compat symbols
4289 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4290 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4291 [18525] localedata: Remove locale timezone information
4292 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4293 [18568] localedata: Update locale data to Unicode 8.0
4294 [18589] locale: sort-test.sh fails at random
4295 [18595] math: ctan, ctanh missing underflows
4296 [18604] libc: assert macro-expands its argument
4297 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4298 contains a vector instruction exception.
4299 [18611] math: j1, jn missing errno setting on underflow
4300 [18618] localedata: sync Chechen locale definitions with other *_RU
4302 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4303 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4304 [18665] network: In send_dg, the recvfrom function is NOT always using the
4305 buffer size of a newly created buffer (CVE-2015-7547)
4306 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4308 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4310 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4311 [18699] math: tilegx cproj() for various complex infinities does not yield
4313 [18724] libc: Harden put*ent functions against data injection
4314 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4315 [18755] build: build errors with -DNDEBUG
4316 [18757] stdio: fmemopen fails to set errno on failure
4317 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4319 [18781] libc: openat64 lacks O_LARGEFILE
4320 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4321 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4322 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4323 [18790] math: [ldbl-128ibm] tanhl inaccurate
4324 [18795] libc: stpncpy fortification misses buffer lengths that are
4325 statically too large
4326 [18796] build: build fails for --disable-mathvec
4327 [18803] math: hypot missing underflows
4328 [18820] stdio: fmemopen may leak memory on failure
4329 [18823] math: csqrt spurious underflows
4330 [18824] math: fma spurious underflows
4331 [18825] math: pow missing underflows
4332 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4333 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4334 [18870] build: sem_open.c fails to compile with missing symbol
4336 [18872] stdio: Fix memory leak in printf_positional
4337 [18873] libc: posix_fallocate overflow check ineffective
4338 [18875] math: Excess precision leads incorrect libm
4339 [18877] libc: arm: mmap offset regression
4340 [18887] libc: memory corruption when using getmntent on blank lines
4341 [18918] localedata: hu_HU: change time to HH:MM:SS format
4342 [18921] libc: Regression: extraneous stat() and fstat() performed by
4344 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4345 binaries (CVE-2015-8777)
4346 [18951] math: tgamma missing underflows
4347 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4349 [18953] localedata: lt_LT: change currency symbol to the euro
4350 [18956] math: powf inaccuracy
4351 [18961] math: [i386] exp missing underflows
4352 [18966] math: [i386] exp10 missing underflows
4353 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4354 [18969] build: multiple string test failures due to missing locale
4356 [18970] libc: Reference of pthread_setcancelstate in libc.a
4357 [18977] math: float / long double Bessel functions not in XSI POSIX
4358 [18980] math: i386 libm functions return with excess range and precision
4359 [18981] math: i386 scalb*, ldexp return with excess range and precision
4360 [18982] stdio: va_list and vprintf
4361 [18985] time: Passing out of range data to strftime() causes a segfault
4363 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4364 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4365 [19012] locale: iconv_open leaks memory on error path
4366 [19016] math: clog, clog10 inaccuracy
4367 [19018] nptl: Mangle function pointers in tls_dtor_list
4368 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4369 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4370 [19048] malloc: malloc: arena free list can become cyclic, increasing
4372 [19049] math: [powerpc] erfc incorrect zero sign
4373 [19050] math: [powerpc] log* incorrect zero sign
4374 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4375 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4376 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4377 [19074] network: Data race in _res_hconf_reorder_addrs
4378 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4379 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4380 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4382 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4384 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4385 [19086] manual: posix_fallocate64 documented argument order is wrong.
4386 [19088] math: lround, llround missing exceptions close to overflow
4388 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4389 [19095] math: dbl-64 lrint incorrect for 64-bit long
4390 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4391 [19124] dynamic-link: ld.so failed to build with older assmebler
4392 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4393 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4394 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4395 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4396 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4397 pthread_setaffinity_np
4398 [19156] math: [ldbl-128] j0l spurious underflows
4399 [19164] nptl: tst-getcpu fails with many possible CPUs
4400 [19168] math: math/test-ildoubl and math/test-ldouble failure
4401 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4402 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4404 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4405 (FE_NOMASK_ENV) do not clear SSE exceptions
4406 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4407 _int_new_arena/reused_arena
4408 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4409 [19201] math: dbl-64 remainder incorrect sign of zero result
4410 [19205] math: bits/math-finite.h conditions do not match math.h and
4412 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4413 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4414 for C99-based standards
4415 [19212] libc: features.h not -Wundef clean
4416 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4418 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4419 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4420 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4422 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4423 "inexact" exceptions
4424 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4426 [19242] libc: strtol incorrect in Turkish locales
4427 [19243] malloc: reused_arena can pick an arena on the free list, leading
4428 to an assertion failure and reference count corruption
4429 [19253] time: tzset() ineffective when temporary TZ did not include DST
4431 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4432 [19270] math: [hppa] Shared libm missing __isnanl
4433 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4434 MAP_HUGETLB and MAP_STACK defines
4435 [19313] nptl: Wrong __cpu_mask for x32
4436 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4437 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4438 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4439 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4440 [19363] time: x32: times() return value wrongly truncates/sign extends
4442 [19367] dynamic-link: Improve branch prediction on Silvermont
4443 [19369] network: Default domain name not reset by res_ninit when "search"
4444 / "domain" entry is removed from resolv.conf
4445 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4447 [19385] localedata: bg_BG: time separator should be colon, not comma
4448 [19408] libc: linux personality syscall wrapper may erroneously return an
4449 error on 32-bit architectures
4450 [19415] libc: dladdr returns wrong names on hppa
4451 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4452 IBM905, IBM907, and IBM909
4453 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4454 [19443] build: build failures with -DDEBUG
4455 [19451] build: Make check fails on test-double-vlen2
4456 [19462] libc: Glibc failed to build with -Os
4457 [19465] math: Wrong code with -Os
4458 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4460 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4462 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4463 [19486] math: S390: Math tests fail with "Exception Inexact set".
4464 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4465 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4467 [19590] math: Fail to build shared objects that use libmvec.so functions.
4471 * The following bugs are resolved with this release:
4473 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4474 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4475 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4476 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4477 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4478 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4479 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4480 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4481 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4482 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4483 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4484 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4485 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4486 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4487 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4488 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4489 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4490 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4491 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4492 18657, 18676, 18694, 18696, 18887.
4494 * Cache information can be queried via sysconf() function on s390 e.g. with
4495 _SC_LEVEL1_ICACHE_SIZE as argument.
4497 * A buffer overflow in gethostbyname_r and related functions performing DNS
4498 requests has been fixed. If the NSS functions were called with a
4499 misaligned buffer, the buffer length change due to pointer alignment was
4500 not taken into account. This could result in application crashes or,
4501 potentially arbitrary code execution, using crafted, but syntactically
4502 valid DNS responses. (CVE-2015-1781)
4504 * The time zone file parser has been made more robust against crafted time
4505 zone files, avoiding heap buffer overflows related to the processing of
4506 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4507 large time zone data files. Overly long time zone specifiers in the TZ
4508 variable no longer result in stack overflows and crashes.
4510 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4511 for LD and GD on x86 and x86-64, has been implemented. You will need
4512 binutils-2.24 or later to enable this optimization.
4514 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4515 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4516 Hat). These updates cause user visible changes, such as the fix for bug
4519 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4520 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4521 condition in some applications.
4523 * Added vector math library named libmvec with the following vectorized x86_64
4524 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4526 The library can be disabled with --disable-mathvec. Use of the functions is
4527 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4528 Shared library libmvec.so is linked in as needed when using -lm (no need to
4529 specify -lmvec explicitly for not static builds).
4530 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4532 * A new fmemopen implementation has been added with the goal of POSIX
4533 compliance. The new implementation fixes the following long-standing
4534 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4535 old implementation is still present for use be by existing binaries.
4537 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4538 releases. It has been fixed to match 2.19 and older, but binaries built
4539 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4541 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4542 Contributed by Roland McGrath (Google).
4544 * The header <regexp.h> is deprecated, and will be removed in a future
4545 release. Use of this header will trigger a deprecation warning.
4546 Application developers should update their code to use <regex.h> instead.
4548 This header was formerly part of SUS, but was deprecated in 1994 and
4549 removed from the standard in 2001. Also, the glibc implementation
4550 leaks memory. See BZ#18681 for more details.
4554 * The following bugs are resolved with this release:
4556 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4557 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4558 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4559 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4560 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4561 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4562 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4563 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4564 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4565 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4568 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4569 too little memory for the to-be-scanned arguments and overflow the
4570 allocated buffer. The implementation now correctly computes the required
4571 buffer size when using malloc, and switches to malloc from alloca as
4574 * A new semaphore algorithm has been implemented in generic C code for all
4575 machines. Previous custom assembly implementations of semaphore were
4576 difficult to reason about or ensure that they were safe. The new version
4577 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4578 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4579 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4581 * Port to Altera Nios II has been contributed by Mentor Graphics.
4583 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4584 implementations for powerpc64/powerpc64le.
4585 Implemented by Adhemerval Zanella (IBM).
4587 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4588 and powerpc64le. This may improve lock scaling of existing programs on
4589 HTM capable systems. The lock elision code is only enabled with
4590 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4591 powerpc will issue a transaction abort on every syscall to avoid side
4592 effects being visible outside transactions.
4594 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4595 AArch64. Contributed by ARM Ltd.
4597 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4599 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4600 under certain input conditions resulting in the execution of a shell for
4601 command substitution when the application did not request it. The
4602 implementation now checks WRDE_NOCMD immediately before executing the
4603 shell and returns the error WRDE_CMDSUB as expected.
4605 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4606 processing format strings with a large number of format specifiers.
4608 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4609 infinite loop if the DNS response contained a PTR record of an unexpected
4612 * The minimum GCC version that can be used to build this version of the GNU
4613 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4614 still be used to compile programs using the GNU C Library.
4616 * The GNU C Library is now built with -Werror by default. This can be
4617 disabled by configuring with --disable-werror.
4619 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4621 * The obsolete sigvec function has been removed. This was the original
4622 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4623 programs have been using instead for about 25 years. Of course, ABI
4624 compatibility for old binaries using sigvec remains intact.
4626 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4627 with newer versions of bison.
4629 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4630 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4631 registers overlay two consecutive single-precision registers. MIPS32R2
4632 introduced a new FPU mode (FR=1) where double-precision registers extend the
4633 corresponding single-precision registers which is incompatible with the
4634 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4635 require the use of FR=1 making a transition necessary. New o32 ABI
4636 extensions enable users to migrate over time from the original o32 ABI
4637 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4638 tracks the ABI of any loaded object and verifies that new objects are
4639 compatible. Mode transitions will also be requested as required and
4640 unsupportable objects will be rejected. The ABI checks include both soft and
4641 hard float ABIs for o32, n32 and n64.
4643 GCC 5 with GNU binutils 2.25 onwards:
4644 It is strongly recommended that all o32 system libraries are built using the
4645 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4646 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4647 compiler using --with-fp-32=xx to set this by default.
4651 * The following bugs are resolved with this release:
4653 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4654 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4655 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4656 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4657 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4658 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4659 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4660 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4661 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4662 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4663 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4664 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4665 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4666 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4667 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4669 * Reverted change of ABI data structures for s390 and s390x:
4670 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4671 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4672 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4673 are preserved pointing straight to the same implementation as the old ones.
4674 Given that, new callers will simply provide a too-big buffer to these
4675 functions. Any applications/libraries out there that embed jmp_buf or
4676 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4677 against 2.19 headers will have to rebuilt again. This is necessary in any
4678 case to revert the breakage in their ABI caused by the glibc change.
4680 * Support for file description locks is added to systems running the
4681 Linux kernel. The standard file locking interfaces are extended to
4682 operate on file descriptions, not file descriptors, via the use of
4683 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4684 are associated with an open file instead of a process.
4686 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4688 * The minimum Linux kernel version that this version of the GNU C Library
4689 can be used with is 2.6.32.
4691 * Running the testsuite no longer terminates as soon as a test fails.
4692 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4693 with PASS or FAIL lines for individual tests. A summary of the results is
4694 printed, including a list of failing lists, and "make check" exits with
4695 error status if there were any unexpected failures. "make check
4696 stop-on-test-failure=y" may be used to keep the old behavior.
4698 * The am33 port, which had not worked for several years, has been removed
4701 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4702 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4703 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4704 conflicted with POSIX (support for which was removed in 2.19), the
4705 interfaces those macros enabled remain available when compiling with
4706 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4707 test macros defined.
4709 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4711 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4712 This may improve lock scaling of existing programs on TX capable systems.
4713 The lock elision code is only built with --enable-lock-elision=yes and
4714 then requires a GCC version supporting the TX builtins. With lock elision
4715 default mutexes are elided via __builtin_tbegin, if the cpu supports
4716 transactions. By default lock elision is not enabled and the elision code
4719 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4720 copy the path argument. This allowed programs to cause posix_spawn to
4721 deference a dangling pointer, or use an unexpected pathname argument if
4722 the string was modified after the posix_spawn_file_actions_addopen
4725 * All supported architectures now use the main glibc sysdeps directory
4726 instead of some being in a separate "ports" directory (which was
4727 distributed separately before glibc 2.17).
4729 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4730 On configurations that support it (all Linux configurations), it's now
4731 used regardless of the --enable-add-ons switch to configure. It is no
4732 longer possible to build such configurations without pthreads support.
4734 * Locale names, including those obtained from environment variables (LANG
4735 and the LC_* variables), are more tightly checked for proper syntax.
4736 setlocale will now fail (with EINVAL) for locale names that are overly
4737 long, contain slashes without starting with a slash, or contain ".." path
4738 components. (CVE-2014-0475) Previously, some valid locale names were
4739 silently replaced with the "C" locale when running in AT_SECURE mode
4740 (e.g., in a SUID program). This is no longer necessary because of the
4743 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4744 with application code using Intel MPX instructions. (With all previous
4745 versions, the MPX register state could be clobbered when making calls
4746 into or out of a shared library.) Note that while the new dynamic
4747 linker is compatible with all known x86 hardware whether or not it
4748 supports Intel MPX, some x86 instruction-set emulators might fail to
4749 handle the new instruction encodings. This is known to affect Valgrind
4750 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4751 release), and might affect other tools that do instruction emulation.
4753 * Support for loadable gconv transliteration modules has been removed.
4754 The support for transliteration modules has been non-functional for
4755 over a decade, and the removal is prompted by security defects. The
4756 normal gconv conversion modules are still supported. Transliteration
4757 with //TRANSLIT is still possible, and the //IGNORE specifier
4758 continues to be supported. (CVE-2014-5119)
4760 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4761 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4762 resulting a denial-of-service security vulnerability in applications which
4763 use functions related to iconv. (CVE-2014-6040)
4767 * The following bugs are resolved with this release:
4769 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4770 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4771 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4772 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4773 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4774 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4775 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4776 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4777 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4778 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4779 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4780 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4781 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4782 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4783 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4784 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4785 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4786 16431, 16453, 16474, 16506, 16510, 16529
4788 * Slovenian translations for glibc messages have been contributed by the
4789 Translation Project's Slovenian team of translators.
4791 * The public headers no longer use __unused nor __block. This change is to
4792 support compiling programs that are derived from BSD sources and use
4793 __unused internally, and to support compiling with Clang's -fblock
4794 extension which uses __block.
4796 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4797 large collation sequences to optimize multiple passes. This cache
4798 computation may overflow for large collation sequences and may cause a
4799 stack or buffer overflow. This is now fixed to use a slower algorithm
4800 which does not use a cache if there is an integer overflow.
4802 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4803 rules for large collation sequences to optimize multiple passes and falls
4804 back to alloca if malloc fails, resulting in a possible stack overflow.
4805 The implementation now falls back to an uncached collation sequence lookup
4808 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4809 initialized for static applications resulting in the security feature
4810 being disabled. The pointer guard is now correctly initialized to a
4811 random value for static applications. Existing static applications need
4812 to be recompiled to take advantage of the fix (bug 15754).
4814 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4815 to the d_name member of struct dirent, or omit the terminating NUL
4816 character. (Bugzilla #14699).
4818 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4819 aligned_alloc functions could allocate too few bytes or corrupt the
4820 heap when passed very large allocation size values (Bugzilla #15855,
4823 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4824 for AF_INET6 has been fixed (Bugzilla #16072).
4826 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4827 pap_CW, quz_PE, the_NP.
4829 * Substantially revised locales: gd_GB, ht_HT
4831 * The LC_ADDRESS field was updated to support country_car for almost all
4834 * ISO 1427 definitions were updated.
4836 * ISO 3166 definitions were updated.
4838 * The localedef utility now supports --big-endian and --little-endian
4839 command-line options to generate locales for a different system from that
4840 for which the C library was built.
4842 * Binary locale files now only depend on the endianness of the system for
4843 which they are generated and not on other properties of that system. As a
4844 consequence, binary files generated with new localedef may be incompatible
4845 with old versions of the GNU C Library, and binary files generated with
4846 old localedef may be incompatible with this version of the GNU C Library,
4847 in the following circumstances:
4849 + Locale files may be incompatible on m68k systems.
4851 + Locale archive files (but not separate files for individual locales) may
4852 be incompatible on systems where plain "char" is signed.
4854 * The configure option --disable-versioning has been removed. Builds with
4855 --disable-versioning had not worked for several years.
4857 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4858 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4860 * SystemTap probes for malloc have been introduced.
4862 * SystemTap probes for slow multiple precision fallback paths of
4863 transcendental functions have been introduced.
4865 * Support for powerpc64le has been added.
4867 * The soft-float powerpc port now supports e500 processors.
4869 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4871 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4872 set of header declarations that are enabled by default, even when other
4873 feature test macros or compiler options such as -std=c99 would otherwise
4874 disable some of those declarations.
4876 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4877 conflict with POSIX. The libbsd-compat library (which was a dummy library
4878 that did nothing) has also been removed.
4880 * Preliminary documentation about Multi-Thread, Async-Signal and
4881 Async-Cancel Safety has been added.
4883 * Change of ABI data structures for s390 and s390x:
4884 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4885 allow for future hardware extensions. All library functions that accept or
4886 return these structures were versioned in order to provide backwards
4887 compatibility with existing code. However, not all cases can be handled
4888 with interface versioning. If an application embeds either structure into
4889 another structure and that structure is passed to another compilation unit
4890 which expects the newer larger-sized object then any access to the new
4891 fields will result in undefined behaviour. Similarly any access to fields
4892 that were moved by the enlarging of the structures will cause undefined
4893 behaviour. To fix the undefined behaviour all objects that are part of the
4894 final in-memory image must agree on the size of structures, and this may
4895 require recompilation.
4899 * The following bugs are resolved with this release:
4901 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4902 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4903 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4904 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4905 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4906 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4907 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4908 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4909 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4910 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4911 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4912 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4913 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4916 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4917 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4918 Distributions can re-enable building and using pt_chown via the new configure
4919 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4920 considerable security risks and should only be used if the distribution
4921 understands and accepts the risks.
4923 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4926 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4927 fixed (Bugzilla #15330).
4929 * Add support for calling C++11 thread_local object destructors on thread
4930 and program exit. This needs compiler support for offloading C++11
4931 destructor calls to glibc.
4933 * Improved worst case performance of libm functions with double inputs and
4936 * Support for priority inherited mutexes in pthread condition variables on
4937 non-x86 architectures.
4939 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4941 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4943 * Optimized string functions for ARM. Implemented by Will Newton and
4946 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4948 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4951 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4952 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4954 * Added a benchmark framework to track performance of functions in glibc.
4956 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4957 It is based on draft TS 18661 and currently enabled as a GNU extension.
4959 * On Linux, the clock function now uses the clock_gettime system call
4960 for improved precision, rather than old times system call.
4962 * Added support for version-3 tz format files. This is needed when using
4963 the tz database release 2013e or later, and affects a few unusual cases --
4964 currently only TZ='America/Godthab' for time stamps after 2037.
4966 * Added new API functions pthread_getattr_default_np and
4967 pthread_setattr_default_np to get and set the default pthread
4968 attributes of a process.
4970 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4971 This may improve lock scaling of existing programs on TSX capable systems.
4972 When the --enable-lock-elision=yes parameter is specified at configure
4973 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4976 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4977 availability). Implemented by Ryan S. Arnold.
4979 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4983 * The following bugs are resolved with this release:
4985 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4986 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4987 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4988 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4989 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4990 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4991 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4992 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4993 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4994 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4995 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4996 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4997 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4998 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4999 14879, 14889, 14893, 14898, 14914.
5001 * Optimization of memcpy for MIPS.
5003 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5004 EMFILE has been fixed (Bugzilla #14889).
5006 * The add-on ports collection is now distributed in the "ports" subdirectory
5007 of the main GNU C Library distribution, rather than separately.
5009 * Port to ARM AArch64 contributed by Linaro.
5011 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5012 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5014 Implemented by Andreas Krebbel.
5016 * The new function secure_getenv allows secure access to the environment,
5017 returning NULL if running in a SUID/SGID process. This function replaces
5018 the internal function __secure_getenv.
5020 * SystemTap static probes have been added into the dynamic linker.
5021 Implemented by Gary Benson.
5023 * Optimizations of string functions strstr, strcasestr and memmem.
5024 Implemented by Maxim Kuvyrkov.
5026 * The minimum Linux kernel version that this version of the GNU C Library
5027 can be used with is 2.6.16.
5029 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5030 powerpc POWER7. Implemented by Will Schmidt.
5032 * New configure option --disable-nscd builds the C library such that it
5033 never attempts to contact the Name Service Caching Daemon (nscd).
5034 New configure option --disable-build-nscd avoids building nscd itself;
5035 this is the default if --disable-nscd is used.
5037 * Improved support for cross-compilation, including cross-testing and
5038 bootstrap builds without a previously built glibc.
5040 * Several testsuite tests are now able to test multiple IFUNC variants of an
5041 interface, rather than just testing the one that would be chooen by
5044 * New configure options --with-bugurl and --with-pkgversion, for
5045 distributors to use to embed their bug-reporting and package version
5046 information in --help and --version output.
5048 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5049 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5050 allows creation of chroots without the procfs mounted on /proc.
5052 * The `crypt' function now fails if passed salt bytes that violate the
5053 specification for those values. On Linux, the `crypt' function will
5054 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5055 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5056 when the mode is enabled.
5058 * The `clock_*' suite of functions (declared in <time.h>) is now available
5059 directly in the main C library. Previously it was necessary to link with
5060 -lrt to use these functions. This change has the effect that a
5061 single-threaded program that uses a function such as `clock_gettime' (and
5062 is not linked with -lrt) will no longer implicitly load the pthreads
5063 library at runtime and so will not suffer the overheads associated with
5064 multi-thread support in other code such as the C++ runtime library.
5066 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5071 * The following bugs are resolved with this release:
5073 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5074 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5075 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5076 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5077 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5078 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5079 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5080 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5081 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5082 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5083 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5084 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5085 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5086 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5087 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5088 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5089 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5090 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5091 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5092 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5093 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5094 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5097 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5098 configuring glibc with:
5099 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5100 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5101 Implemented by H.J. Lu.
5105 + define static_assert
5107 + do not declare gets
5109 + declare at_quick_exit and quick_exit also for ISO C11
5111 + aligned_alloc. NB: The code is deliberately allows the size parameter
5112 to not be a multiple of the alignment. This is a moronic requirement
5113 in the standard but it is only a requirement on the caller, not the
5116 + timespec_get added
5118 + uchar.h support added
5120 + CMPLX, CMPLXF, CMPLXL added
5122 Implemented by Ulrich Drepper.
5124 * Support for the IA-64 has been moved to ports.
5126 * Remove support for anything but ELF binary format
5128 * Checking versions of poll, ppoll added.
5129 Implemented by Ulrich Drepper.
5131 * More generic and 64-bit performance optimizations to math functions.
5132 Implemented by Ulrich Drepper.
5134 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5135 headers and functions available at compile time as they were before
5136 version 2.14. This option will be removed at some time in the future
5137 after the TI-RPC library becomes fully sufficient for the needs of
5138 existing applications.
5140 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5141 Note that glibc is not expected to work with any Linux kernel version
5144 * New header <sys/auxv.h> and function getauxval allowing easy access to
5145 the AT_* key-value pairs passed from the Linux kernel. The header also
5146 defines the HWCAP_* bits associated with the AT_HWCAP key.
5148 * New locales: mag_IN
5150 * New configure option --enable-systemtap builds SystemTap static probes
5151 into libc for setjmp and longjmp and into libpthread for various operations.
5152 So far the setjmp/longjmp probes and some of the libpthread probes are
5153 provided only for i*86 and x86_64.
5154 Implemented by Roland McGrath and Rayson Ho.
5156 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5158 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5161 * More optimized functions for SPARC. Implemented by David S. Miller.
5163 * Improved support for cross-compilation, especially bootstrap builds
5164 without a previously built glibc.
5166 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5167 Chris Metcalf from Tilera.
5169 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5170 now supported for ARM processors.
5172 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5173 as the name of the dynamic linker, to distinguish it from the
5174 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5176 * Support for CRIS has been removed from ports.
5178 * A new class of installed header has been documented for low-level
5179 platform-specific functionality. PowerPC added the first instance with a
5180 function to provide time base register access. Contributed by Tulio
5181 Magno Quites Machado Filho.
5183 * ix86 configurations now install header files that are consistent with
5184 what x86-64 configurations install. These same header files can be used
5185 for -m32, -m64, or -mx32 builds.
5186 Contributed by H.J. Lu.
5188 * Math library bug fixes. A thorough audit of all open math library bugs was
5189 conducted by Joseph Myers. Significant progress was made on many math
5190 library bugs resulting in more accurate exceptions and function results.
5191 Many thanks to all those that contributed including Andreas Jaeger for his
5192 patch review and work on the x87 trigonometric instruction issues.
5194 * Timezone data is no longer installed. Timezone-related binaries and scripts
5195 will continue to be installed. Users should obtain their timezone data from
5196 their distribution provider or from the tzdata package at
5197 <ftp://munnari.oz.au/pub/>.
5201 * The following bugs are resolved with this release:
5203 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5204 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5205 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5206 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5207 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5208 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5209 13484, 13506, 13515, 13523, 13524, 13538, 13540
5211 * New program pldd to list loaded object of a process
5212 Implemented by Ulrich Drepper.
5214 * Add nss_db support back to glibc. No more dependency on Berkeley db
5215 and support for initgroups lookups.
5216 Implemented by Ulrich Drepper.
5218 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5219 Contributed by HJ Lu.
5221 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5222 Contributed by HJ Lu.
5224 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5225 on x86-32 and x86-64.
5226 Contributed by Liubov Dmitrieva.
5228 * Optimized strchr and strrchr for SSE on x86-32.
5229 Contributed by Liubov Dmitrieva.
5231 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5232 for x86-64 and x86-32.
5233 Contributed by Liubov Dmitrieva.
5235 * New interfaces: scandirat, scandirat64
5236 Implemented by Ulrich Drepper.
5238 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5239 Implemented by Ulrich Drepper.
5241 * nscd now also caches the netgroup database.
5242 Implemented by Ulrich Drepper.
5244 * Integrate libm with gcc's -ffinite-math-only option.
5245 Implemented by Ulrich Drepper.
5247 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5248 to math functions. Implemented by Ulrich Drepper.
5250 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5251 Implemented by Ulrich Drepper.
5253 * New Linux interfaces: process_vm_readv, process_vm_writev
5255 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5256 Implemented by Ulrich Drepper.
5258 * Optimized nearbyint and strcasecmp for PPC.
5259 Implemented by Adhemerval Zanella.
5261 * New locales: bho_IN, unm_US, es_CU, ta_LK
5265 * The following bugs are resolved with this release:
5267 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5268 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5269 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5270 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5271 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5272 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5273 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5274 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5275 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5276 12795, 12811, 12813, 12814, 12841
5278 * The RPC implementation in libc is obsoleted. Old programs keep working
5279 but new programs cannot be linked with the routines in libc anymore.
5280 Programs in need of RPC functionality must be linked against TI-RPC.
5281 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5283 Visible changes of this change include (obviously) the inability to link
5284 programs using RPC functions without referencing the TI-RPC library and the
5285 removal of the RPC headers from the glibc headers.
5286 Implemented by Ulrich Drepper.
5288 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5289 syncfs, setns, sendmmsg
5291 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5292 yue_HK, lij_IT, mhr_RU
5294 * New encodings: CP770, CP771, CP772, CP773, CP774
5296 * New program sotruss to trace calls through PLTs
5297 Implemented by Ulrich Drepper.
5299 * The malloc hook implementation is marked deprecated and will be removed
5300 from the default implementation in the next version. The design never
5301 worked ever since the introduction of threads. Even programs which do
5302 not create threads themselves can use multiple threads created internally.
5306 * The following bugs are resolved with this release:
5308 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5309 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5310 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5311 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5314 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5316 * POWER7 optimizations: memset, memcmp, strncmp
5318 * New optimized string functions for x86-64: strnlen (SSE2),
5319 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5320 Implemented by Ulrich Drepper.
5324 * The following bugs are resolved with this release:
5326 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5327 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5328 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5329 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5330 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5331 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5332 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5333 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5335 * New interfaces: pthread_getname_np, pthread_setname_np
5337 * New Linux interface: recvmmsg
5339 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5341 * The dynamic linker now recognizes supported ABI versions from the
5342 EI_ABIVERSION field in the ELF header.
5343 Implemented by Ulrich Drepper.
5345 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5346 will not be used to fill in password fields in the passwd.byname replies.
5347 Instead it is used to synthesize the shadow.byname table, should it be
5348 missing. This is a useful mode in some installations involving Solaris.
5349 Implemented by Ulrich Drepper.
5351 * New locales: kok_IN, sq_MK, cv_RU
5355 * The following bugs are resolved with this release:
5357 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5358 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5359 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5360 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5361 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5362 10789, 10817, 10823, 10840, 10847
5364 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5366 Implemented by Ulrich Drepper.
5368 * Checking version of longjmp added that fails if an uninitialized stack
5369 frame would be created. Implemented by Ulrich Drepper.
5371 * STT_GNU_IFUNC is now supported in static executables.
5372 Implemented by H.J. Lu.
5374 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5376 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5377 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5378 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5379 Contributed by H.J. Lu.
5381 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5382 Implemented by Ulrich Drepper.
5384 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5386 Contributed by H.J. Lu.
5388 * Support for fma instruction in AVX on x86-64.
5389 Implemented by H.J. Lu and Ulrich Drepper.
5391 * AVX support in x86-64 auditing support in ld.so.
5392 Implemented by H.J. Lu.
5394 * STB_GNU_UNIQUE support added.
5395 Implemented by Ulrich Drepper.
5397 * Implement second fallback mode for optimized DNS lookup for even more
5398 broken environments. If two requests from the same port are not
5399 handled correctly close the socket and open a new one before sending
5400 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5401 can be used to select this mode right away, instead of rediscovering the
5402 necessity is every process again.
5403 Implemented by Ulrich Drepper.
5405 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5406 Implemented by Adam Tkac.
5408 * Optimized iconv conversions for S390x.
5409 Implemented by Andreas Krebbel.
5411 * Using condvars with PI mutexes is now more efficient due to kernel
5412 support for requeueing to PI futexes. NPTL support added for x86-64.
5413 Implemented by Ulrich Drepper.
5415 * New locales: ps_AF, my_MM
5419 * The following bugs are resolved with this release:
5421 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5422 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5423 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5424 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5425 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5427 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5428 Implemented by Ulrich Drepper.
5430 * New Linux interfaces: accept4, fallocate, fallocate64.
5431 Implemented by Ulrich Drepper.
5433 * Correct declarations of string function when used in C++ code. This
5434 could lead to compile errors for invalid C++ code.
5436 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5439 * New POSIX 2008 interface: psiginfo
5440 Implemented by Ulrich Drepper.
5442 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5443 Implemented by Ulrich Drepper.
5445 * Support for selecting between multiple function definitions at runtime
5446 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5448 * The libcrypt library can now use the hash function implementations in
5449 NSS. Implemented by Ulrich Drepper.
5451 * The malloc implementation can be compiled to be less memory efficient
5452 but higher performing in multi-threaded programs.
5453 Implemented by Ulrich Drepper.
5455 * New locales: nan_TW@latin, ks_IN
5457 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5458 Implemented by Ulrich Drepper.
5460 * Extended printf hook support. It is possible to use user-defined types
5461 and extend existing format specifiers.
5462 Implemented by Ulrich Drepper.
5464 * Handling for group shadow files has been added.
5465 Implemented by Ulrich Drepper.
5467 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5468 servers (the case, e.g., for some people using the built-in DNS
5469 server in ADSL modems/routers). There is a once-per-process timeout
5470 in case of a broken server. To avoid it, users can run nscd or put
5471 'options single-request' in /etc/resolv.conf.
5472 Implemented by Ulrich Drepper.
5476 * The following bugs are resolved with this release:
5478 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5479 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5480 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5481 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5482 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5484 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5485 up at the same time. Implemented by Ulrich Drepper.
5487 * TLS descriptors for LD and GD on x86 and x86-64.
5488 Implemented by Alexandre Oliva.
5490 * getaddrinfo now handles DCCP and UDPlite.
5491 Implemented by Ulrich Drepper.
5493 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5494 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5495 Implemented by Ulrich Drepper.
5497 * New implementation of memmem, strstr, and strcasestr which is O(n).
5498 Implemented by Eric Blake.
5500 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5502 * Implement "e" option for popen to open file descriptor with the
5503 close-on-exec flag set. Implemented by Ulrich Drepper.
5505 * Implement "b" mode for fmemopen. In this mode writes writes don't
5506 implicitly add a NUL byte and seeks from the end of the buffer really
5507 use the buffer end, not the string length as the basis.
5508 Implemented by Ulrich Drepper.
5510 * Many functions, exported and internal, now atomically set the close-on-exec
5511 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5513 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5515 Implemented by Pravin Satpute.
5517 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5521 * The following bugs are resolved with this release:
5523 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5524 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5525 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5526 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5527 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5528 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5529 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5531 * New locales: bo_CN, bo_IN, shs_CA.
5533 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5535 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5536 Implemented by Pravin Satpute.
5538 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5540 * nscd caches now all timeouts for DNS entries
5541 Implemented by Ulrich Drepper.
5543 * nscd is more efficient and wakes up less often.
5544 Implemented by Ulrich Drepper.
5546 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5547 vdprintf, and obstack_vprintf.
5548 Implemented by Jakub Jelinek.
5550 * Faster memset for x86-64.
5551 Implemented by Harsha Jagasia and H.J. Lu.
5553 * Faster memcpy on x86.
5554 Implemented by Ulrich Drepper.
5556 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5557 Implemented by Ulrich Drepper.
5559 * Faster sqrt and sqrtf implemention for some PPC variants.
5560 Implemented by Steven Munroe.
5564 * The following bugs are resolved with this release:
5566 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5567 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5568 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5569 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5570 5071, 5103, 5104, 5112, 5113, 5184, 5186
5572 * More checking functions: fread, fread_unlocked, open*, mq_open.
5573 Implemented by Jakub Jelinek and Ulrich Drepper.
5575 * Extend fortification to C++. Implemented by Jakub Jelinek.
5577 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5578 by not recognizing 'a' as a modifier when those specs are requested.
5579 Implemented by Jakub Jelinek.
5581 * PPC optimizations to math and string functions.
5582 Implemented by Steven Munroe.
5584 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5585 options to be passed. Implemented by Ulrich Drepper.
5587 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5589 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5590 Implemented by Ulrich Drepper.
5592 * Handle private futexes in the NPTL implementation.
5593 Implemented by Jakub Jelinek and Ulrich Drepper.
5595 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5596 Implemented by Roland McGrath and Ulrich Drepper.
5598 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5600 * SHA-256 and SHA-512 based password encryption.
5601 Implemented by Ulrich Drepper.
5603 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5604 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5607 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5608 Implemented by Ulrich Drepper.
5612 * The following bugs are resolved with this release:
5614 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5615 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5616 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5617 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5618 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5619 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5620 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5623 * New Linux interfaces: epoll_pwait, sched_getcpu.
5625 * New generic interfaces: strerror_l.
5627 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5631 * The following bugs are resolved with this release:
5633 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5634 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5635 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5636 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5637 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5638 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5639 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5640 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5641 3225, 3251, 3252, 3253, 3273
5643 * For Linux, the sorting of addresses returned by getaddrinfo now also
5644 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5645 Implemented by Ulrich Drepper.
5647 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5648 Implemented by Ulrich Drepper.
5650 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5652 * New iconv module for MIK. Contributed by Alexander Shopov.
5654 * For sites with broken group and/or passwd database, the auto-propagate
5655 option of nscd can prevent creating ID lookup entries from the results
5656 of a name lookup and vice versa. This usually is no problem but some
5657 site might have problems with the default behavior.
5658 Implemented by Ulrich Drepper.
5660 * Iterating over entire database in NIS can be slow. With the
5661 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5662 to trade time for memory. The entire database will be read at once.
5663 Implemented by Ulrich Drepper.
5665 * The interfaces introduced in RFC 3542 have been implemented by
5668 * Support for the new ELF hash table format was added by Ulrich Drepper.
5670 * Support for priority inheritance mutexes added by Jakub Jelinek and
5673 * Support for priority protected mutexes added by Jakub Jelinek.
5675 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5676 or_IN, csb_PL, fy_NL, sr_ME.
5680 * More overflow detection functions.
5682 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5683 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5685 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5686 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5687 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5688 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5689 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5690 by Masahide Washizawa.
5692 * It is now possible to install audit libraries for the dynamic linker using
5693 LD_AUDIT. Implemented by Ulrich Drepper.
5695 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5696 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5697 For a libc and libpthread that works well on Linux 2.4 kernels, we
5698 recommend using the stable 2.3 branch.
5700 * The new function open_wmemstream acts like open_memstream,
5701 but uses a wchar_t wide character buffer.
5703 * The new function ppoll is an improved version of poll, similar to pselect.
5705 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5706 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5707 renameat, unlinkat, linkat, symlinkat, readlinkat.
5709 * New Linux kernel system calls: unshare,
5710 inotify_init, inotify_add_watch, inotify_rm_watch.
5712 * The euidaccess function is now also known by the alias eaccess,
5713 for compatibility with some other systems.
5715 * Timezone data updated to 2006b version.
5719 * The following bugs are resolved with this release:
5721 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5722 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5723 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5724 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5725 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5726 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5728 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5730 * As of this release, GCC 4 can be used to compile the C Library.
5732 * Timezone data updated to 2005m version.
5736 * The following bugs are resolved with this release:
5738 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5739 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5740 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5741 777, 787, 821, 822, 823, 825
5743 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5747 * Support for RFC 3678. Real implementations exist only for Linux so far.
5748 Implemented by Ulrich Drepper.
5750 * nscd can now cache entries persistently. Expiring entries are reloaded.
5751 For speedups the cache can be shared in memory with client processes.
5752 Implemented by Ulrich Drepper.
5754 * nscd can now perform SELinux checks.
5755 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5757 * getaddrinfo queries are now cached. Canonical name lookup is performed
5759 Implemented by Ulrich Drepper.
5761 * The nothrow function attribute is used when headers are used by gcc when
5762 compiling C code. This can avoid significant amounts of exception
5765 * The malloc functions perform more error checking and are stricter when
5766 it comes to reacting on errors. The default action is to terminate
5767 the process after showing an error message. Implemented by Ulrich Drepper.
5769 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5770 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5772 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5773 namespaces using the new function dlmopen(). This feature is of course,
5774 like most other dynamic loading functionality, not available in statically
5775 linked applications. Implemented by Ulrich Drepper.
5777 * Low-overhead boundary checking variants of string and some stdio functions
5778 were added. These are to be used in conjunction with a gcc patch by
5779 Jakub Jelinek which adds calls to these functions if possible.
5780 Implemented by Jakub Jelinek and Ulrich Drepper.
5782 * Old code for several operating systems and machine architectures that
5783 have not been in working condition in a long time have been removed from
5784 the main source tree maintained by the GNU C Library's maintainers.
5785 These files are now reside in the separate `ports' source module
5786 that is usable as an add-on when building the library.
5790 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5791 interrogate the dynamic linker, compatible with the Solaris interface.
5793 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5794 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5796 * getifaddrs now uses the netlink interface on Linux to get its information.
5797 Implemented by Thorsten Kukuk.
5799 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5800 Implemented by Ulrich Drepper.
5802 * support for non-executable stacks on x86 has been added. Changes mostly
5805 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5808 * getaddrinfo now performs destination address selection according to
5813 * Thread-safe interfaces for many functions that access locale data
5814 were added in version 2.3, but these features were omitted from NEWS.
5815 Many functions have variants with an `_l' suffix that take a `locale_t'
5816 object as a parameter rather than consulting the current locale.
5817 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5818 create and maintain `locale_t' objects. Additionally, the new function
5819 `uselocale' sets "the current locale" (as used by functions not so
5820 parameterized) set for an individual thread. These features were added
5821 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5823 * The functions getresuid, getresgid, setresuid, and setresgid, which
5824 have long been available on Linux, are now declared in <unistd.h>
5825 and are now also available on the Hurd.
5827 * ELF thread-local storage support (TLS) now works on x86-64.
5829 * The new dynamic string token $LIB is expanded in shared library names.
5830 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5832 * Aldy Hernandez contributed complete software floating point support for
5833 PowerPC machines with no FPU.
5835 * fexecve is implemented on Linux.
5837 * The `btowc' function should work at least twice as fast due to
5838 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5840 * With approriate thread add-ons cancelable functions are now implemented
5841 in libc.so as well. No need to call the function in libpthread. This
5842 change allowed to finally disable the incorrect and expensive handling
5843 of weak definition in ld.so.
5845 * Yet more PLT entries in libc.so have been removed. We finally arrived
5846 at the bare minimum. Startup times improved appropriately.
5848 * Support for the new Linux/x86 system call interface was added. The
5849 AT_SYSINFO auxiliary vector entry is recognized and handled.
5853 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5856 * iconv (the program and the interface) now accepts empty names (excluding
5857 options like //TRANSLIT) to mean "use charset of current locale".
5859 * localedef can now transliterate characters in strings which are not in
5860 the provided charmap. The information from the input locale is used.
5862 * Prelinking support was added for ELF targets. This requires additional
5863 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5865 * Read-only stdio streams now use mmap to speed up operation by eliminating
5866 copying and buffer underflows. To use add 'm' to the mode string of
5867 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5869 * The malloc functions were completely rewritten by Wolfram Gloger based
5870 on Doug Lea's malloc-2.7.0.c.
5872 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5873 implementation of regex.
5875 * Bruno Haible upgraded the iconv and locale implementation to support
5878 * Contents of the LC_* and LANG environment variables in the CEN style are
5879 not recognized anymore. It never was used. Change by Ulrich Drepper.
5881 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5882 thread-local storage (TLS) ABI on some platforms.
5883 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5885 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5886 EUC-JISX0213, and TSCII.
5888 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5889 BSD-compatible interface for getting all network interface addresses.
5890 Implementation for IPv4 by Roland McGrath.
5892 * Loading of locale data is faster due to the introduction of a locale
5893 archive. Implemented by Roland McGrath and Ulrich Drepper.
5895 * Startup times are significantly reduced by not using exported functions
5896 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5899 * Steven Munroe contributed a port to PowerPC64/Linux.
5903 * The Hurd now uses the GNU libio implementation of stdio rather than the
5904 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5906 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5907 with the same behavior as the Linux system call of the same name.
5911 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5912 128-bit long double format.
5914 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5915 IBM1161, and IBM1162 charsets.
5917 * Andreas Jaeger contributed a port to x86-64/Linux.
5919 * Peter Bruin contributed a port to PowerPC/Hurd.
5921 * libc functions using I/O streams now can handle wide-oriented streams
5924 * optimizations in the dynamic linker. Binaries created by recent binutils
5925 versions start up quicker due to reduced time spent on relocations.
5927 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5931 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5932 asinh, atanh, j0 for the 128-bit long double format.
5934 * Bruno Haible updated all the code handling Unicode in some form to
5935 support Unicode 3.1.
5937 * Speed of regex for single-byte locales is back to previous levels.
5938 Patch by Isamu Hasegawa.
5940 * Alpha, SPARC, and IA-64 now also using floating stacks.
5942 * Startup time of internationalized applications greatly improved through
5943 iconv cache. Use iconvconfig to generate the cache file.
5944 Contributed by Ulrich Drepper.
5946 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5947 severe performance problems. Patch by David Mosberger.
5949 * The Hurd port got a lot more functionality like AIO, various stdio
5950 extensions, etc. Mainly done by Roland McGrath.
5952 * mtrace can now lookup symbols in shared libraries.
5956 * Intel's IA-64 math library is largely integrated. It provides fast and
5957 accurate implementatations for most basic and standard math functions
5958 in float, double, and long double format.
5960 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5961 and asin for the 96-bit long double format and asin, log, tan for the
5962 128-bit long double format.
5964 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5965 The basic double functions exist today. Contributed by Abraham Ziv
5966 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5967 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5969 * An asynchronous name lookup library was added. The interface is designed
5970 after POSIX AIO. The proposal was circulated beforehand to get comments.
5971 No negative ones came in. Implemented by Ulrich Drepper.
5973 * Port to S390/64bit contributed by Martin Schwidefsky
5974 <schwidefsky@de.ibm.com>.
5976 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5977 of functions for Linux/IA-64.
5979 * The RPC code is now thread safe. Threads can now use the same service
5980 of different services at the same time. Patch by Eric Norum
5981 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5983 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5984 family of functions for Linux/S390.
5986 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5987 of functions for Linux/x86.
5989 * Port to Linux/CRIS contributed by Axis Communications.
5993 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5994 we can now check for namespace violations and missing declarations. The
5995 result is that almost all headers are now Unix-compliant (as defined in
5996 the upcoming XPG6). The negative side is that some programs might need
5997 corrections, too, if they depend on the incorrect form of the headers in
5998 previous versions which defined too many symbols and included too many
6001 * regex now handles multibyte character sets correctly.
6002 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6004 * iconv (the program) does now conform to the upcoming XPG6 and handles
6005 charmaps. Instead of the charset names the path of charmaps can be
6006 provided and the conversion happens based on this data.
6007 Contributed by Ulrich Drepper.
6009 * The locale program now provides detailed information about the installed
6014 only lists the names of the supported locales
6018 provides details such as country, language, and codeset name.
6019 Contributed by Ulrich Drepper.
6023 * The gencat program now parses the input file according to the charset
6024 selected by the LC_CTYPE category. This is important for stateful
6025 character sets. To make generating catalogs easier there is a way
6026 to overwrite the charset selected by the locale: before the first
6027 message or $ quote line the catalog can contain a line like
6029 $ codeset=ISO-8859-2
6031 to select the charset (ISO-8859-2 in this case).
6033 Implemented by Shinya Hanataka and Ulrich Drepper.
6035 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6036 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6037 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6039 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6040 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6042 * The LANGUAGE environment variable is now ignored unless the locale is
6043 changed from the default "C" locale.
6045 * The usual bug fixes.
6049 * Greg McGary added runtime support for bounds checking using gcc's
6050 new -fbounded-pointers option. ix86 target is complete. PowerPC
6053 * Thorsten Kukuk added secure mode support to nscd.
6055 * The Berkeley db libraries have been removed.
6057 Related, the nss_db module is now in a separate package since it
6058 obviously requires a database library being available.
6060 * Wide character I/O streams implemented by Ulrich Drepper.
6062 * Functions from the extended socket API added by Ulrich Drepper.
6064 * Functions feenableexcept and fedisableexcept to control the
6065 behaviour of individual exceptions have been added by Andreas Jaeger.
6067 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6069 * The resolver code has been updated from bind 8.2.3-T5B which supports
6070 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6073 This change could in some situations effect backward compatibility. Since
6074 now `_res' is a thread-local instead of a global variable, modifying it
6075 in one thread does not have any effect in other threads.
6077 The resolver library was also extended to allow IPv6 as the transport
6078 protocol for the requests. This work was done by Stig Venaas.
6080 * Compatibility code for K&R C compilers has been removed from the
6081 header files. A ISO C compiler is needed to use the library
6082 (conforming to either C89 or C99 standard).
6084 * Complete rewrite of the localedef program to support multibyte character
6085 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6086 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6087 Implemented by Ulrich Drepper.
6089 Bruno Haible significantly improved the generation and use of the data
6090 structures for the wide character tables.
6092 * Plural handling in gettext implemented by Ulrich Drepper.
6094 * The utmp daemon has been removed.
6096 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6098 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6101 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6103 * POSIX barriers implemented by Kaz Kylheku.
6105 * POSIX spawn function family implemented by Ulrich Drepper.
6107 * POSIX spinlocks are now available.
6109 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6111 * the configure option --enable-kernel=X.Y.Z allows to strip out
6112 compatibility for kernel versions before X.Y.Z. This is currently only
6113 implemented for Linux.
6115 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6116 field sin6_scope_id. This means that all programs using IPv6 should be
6117 recompiled. Don't expect binary compatibility with previous glibc
6120 * various conversion modules for IBM character sets contributed by
6123 * IA-64 port by Jes Sorensen and HJ Lu.
6137 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6139 * New xdr functions are added; some rpc functions are now 64bit clean.
6141 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6143 * Fixed known incompatibilities with glibc 2.0.
6145 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6147 * Optimized a number of functions (especially the ELF dynamic loader).
6149 * Update timezone data files.
6151 * lots of charmaps corrections
6153 * some new locale definitions and charmaps
6158 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6159 conform to POSIX member type requirements. Symbol versions have been
6160 adjusted as needed within the library, and for direct use by applications,
6161 but there is potential for problems if third-party libraries use
6162 struct timeval as part of their interface. This does not present
6163 a problem for X and other "essential" system libraries.
6165 * An additional locale model to support C++ Standard Library locale
6166 model and probably more was implemented by Ulrich Drepper.
6168 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6171 * Miles Bader provided the `argp' function family to support hierachical
6172 command line argument parsing, layered on top of getopt.
6174 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6176 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6179 * scanf recognizes the %a and %A format for scanning floating point numbers.
6181 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6182 information and interfaces for the available integer types.
6184 * about 130 new math functions were added to implement the ISO C9x math
6187 * the new header <complex.h> contains definitions of the complex math
6188 functions from ISO C 9X.
6190 * the new header <tgmath.h> defines generic macros to use complex or
6191 real valued functions.
6193 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6195 * Andreas Jaeger provided a test suite for the math library.
6197 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6199 * Ulrich Drepper added character set conversion functions (iconv).
6201 * Optimized string functions have been added.
6203 * The localedata addon is now part of glibc.
6205 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6207 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6208 daemon for NSS (nscd).
6210 Missing a better place here are some numbers on improvements. Under
6211 Linux 2.1.125 un-tar-ing the kernel sources takes
6215 using local files 12.19s 6.88s 22.91s
6217 using NIS 13.92s 8.91s 26.34s
6219 using NIS & nscd 10.37s 7.34s 25.30s
6221 using NIS+ 27.57s 30.37s 640.46s
6223 using NIS+ & nscd 10.25s 7.83s 26.51s
6225 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6227 Keep in mind that non-namelookup related operations dominate above times.
6228 It was just a common complain that using NIS+ unpacking the kernel is
6231 [1] The old nscd implementation is not available anymore since it was
6232 distributed with glibc up to version 2.0.98 and thus is now replaced.
6234 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6236 * Mark Kettenis provided a Hesiod NSS module.
6238 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6239 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6241 * rcmd can now handle netgroups (Dick Streefland).
6243 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6246 * Support for the IPv6 protocol has been added to the socket API, as per the
6247 latest draft standards.
6249 * Support for Linux 2.2 has been added.
6251 * Interface changes relative to the latest 2.0.x release:
6252 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6253 addseverity NEW: Unix98
6254 alphasort64 NEW: LFS
6255 argp_err_exit_status NEW: argp, GNU ext
6256 argp_error NEW: argp, GNU ext
6257 argp_failure NEW: argp, GNU ext
6258 argp_help NEW: argp, GNU ext
6259 argp_parse NEW: argp, GNU ext
6260 argp_program_bug_address NEW: argp, GNU ext
6261 argp_program_version NEW: argp, GNU ext
6262 argp_program_version_hook NEW: argp, GNU ext
6263 argp_state_help NEW: argp, GNU ext
6264 argp_usage NEW: argp, GNU ext
6265 authdes_create NEW: Secure RPC
6266 authdes_getucred NEW: Secure RPC
6267 authdes_pk_create NEW: Secure RPC
6268 backtrace NEW: GNU ext.
6269 backtrace_symbols NEW: GNU ext.
6270 backtrace_symbols_fd NEW: GNU ext.
6272 cacosf NEW: ISO C 9x
6273 cacosh NEW: ISO C 9x
6274 cacoshf NEW: ISO C 9x
6275 cacoshl NEW: ISO C 9x
6276 cacosl NEW: ISO C 9x
6283 casinf NEW: ISO C 9x
6284 casinh NEW: ISO C 9x
6285 casinhf NEW: ISO C 9x
6286 casinhl NEW: ISO C 9x
6287 casinl NEW: ISO C 9x
6289 catanf NEW: ISO C 9x
6290 catanh NEW: ISO C 9x
6291 catanhf NEW: ISO C 9x
6292 catanhl NEW: ISO C 9x
6293 catanl NEW: ISO C 9x
6294 cbc_crypt NEW: Secure RPC
6298 ccoshf NEW: ISO C 9x
6299 ccoshl NEW: ISO C 9x
6305 cimagf NEW: ISO C 9x
6306 cimagl NEW: ISO C 9x
6307 clearerr_locked REMOVED
6308 clntunix_create NEW: sunrpc ext
6310 clog10 NEW: ISO C 9x
6311 clog10f NEW: ISO C 9x
6312 clog10l NEW: ISO C 9x
6322 cprojf NEW: ISO C 9x
6323 cprojl NEW: ISO C 9x
6325 crealf NEW: ISO C 9x
6326 creall NEW: ISO C 9x
6331 csinhf NEW: ISO C 9x
6332 csinhl NEW: ISO C 9x
6335 csqrtf NEW: ISO C 9x
6336 csqrtl NEW: ISO C 9x
6340 ctanhf NEW: ISO C 9x
6341 ctanhl NEW: ISO C 9x
6343 des_setparity NEW: Secure RPC
6344 ecb_crypt NEW: Secure RPC
6345 endutxent NEW: Unix98
6347 exp10f NEW: ISO C 9x
6348 exp10l NEW: ISO C 9x
6352 fattach NEW: STREAMS
6353 fdetach NEW: STREAMS
6357 feclearexcept NEW: ISO C 9x
6358 fegetenv NEW: ISO C 9x
6359 fegetexceptflag NEW: ISO C 9x
6360 fegetround NEW: ISO C 9x
6361 feholdexcept NEW: ISO C 9x
6363 feraiseexcept NEW: ISO C 9x
6364 ferror_locked REMOVED
6365 fesetenv NEW: ISO C 9x
6366 fesetexceptflag NEW: ISO C 9x
6367 fesetround NEW: ISO C 9x
6368 fetestexcept NEW: ISO C 9x
6369 feupdateenv NEW: ISO C 9x
6370 fflush_locked REMOVED
6374 fgets_unlocked NEW: GNU ext.
6375 fileno_locked REMOVED
6387 fputc_locked REMOVED
6388 fputs_unlocked NEW: GNU ext.
6389 fread_unlocked NEW: GNU ext.
6394 fstatvfs NEW: Unix98
6398 ftruncate64 NEW: LFS
6400 fwrite_unlocked NEW: GNU ext.
6401 gai_strerror NEW: IPv6
6405 getchar_locked REMOVED
6407 getdate_err NEW: Unix98
6408 getdate_r NEW: GNU ext.
6410 getnameinfo NEW: IPv6
6411 getnetname NEW: Secure RPC
6412 getpmsg NEW: STREAMS
6413 getpt NEW: Unix98 PTY
6414 getrlimit64 NEW: LFS
6415 getutxent NEW: Unix98
6416 getutxid NEW: Unix98
6417 getutxline NEW: Unix98
6418 glob64 NEW: GNU ext.
6419 globfree64 NEW: GNU ext.
6420 gnu_get_libc_release NEW: GNU ext.
6421 gnu_get_libc_version NEW: GNU ext.
6422 grantpt NEW: Unix98 PTY
6423 host2netname NEW: Secure RPC
6425 iconv_close NEW: iconv
6426 iconv_open NEW: iconv
6427 if_freenameindex NEW: IPv6
6428 if_indextoname NEW: IPv6
6429 if_nameindex NEW: IPv6
6430 if_nametoindex NEW: IPv6
6431 in6addr_any NEW: IPv6
6432 in6addr_loopback NEW: IPv6
6433 inet6_isipv4mapped NEW: IPv6
6434 isastream NEW: STREAMS
6435 iswblank NEW: GNU ext.
6436 key_decryptsession NEW: Secure RPC
6437 key_decryptsession_pk NEW: Secure RPC
6438 key_encryptsession NEW: Secure RPC
6439 key_encryptsession_pk NEW: Secure RPC
6440 key_gendes NEW: Secure RPC
6441 key_get_conv NEW: Secure RPC
6442 key_secretkey_is_set NEW: Secure RPC
6443 key_setnet NEW: Secure RPC
6444 key_setsecret NEW: Secure RPC
6445 llrint NEW: ISO C 9x
6446 llrintf NEW: ISO C 9x
6447 llrintl NEW: ISO C 9x
6448 llround NEW: ISO C 9x
6449 llroundf NEW: ISO C 9x
6450 llroundl NEW: ISO C 9x
6455 lrintf NEW: ISO C 9x
6456 lrintl NEW: ISO C 9x
6457 lround NEW: ISO C 9x
6458 lroundf NEW: ISO C 9x
6459 lroundl NEW: ISO C 9x
6461 makecontext NEW: Unix98
6462 mempcpy NEW: GNU ext.
6465 modify_ldt NEW: kernel
6469 nearbyint NEW: ISO C 9x
6470 nearbyintf NEW: ISO C 9x
6471 nearbyintl NEW: ISO C 9x
6472 netname2host NEW: Secure RPC
6473 netname2user NEW: Secure RPC
6474 nexttoward NEW: ISO C 9x
6475 nexttowardf NEW: ISO C 9x
6476 nexttowardl NEW: ISO C 9x
6480 passwd2des NEW: Secure RPC
6482 pow10f NEW: GNU ext.
6483 pow10l NEW: GNU ext.
6486 printf_size NEW: GNU ext.
6487 printf_size_info NEW: GNU ext.
6488 profil_counter REMOVED
6489 pthread_mutexattr_getkind_np REPLACED
6490 pthread_mutexattr_setkind_np REPLACED
6491 ptsname NEW: Unix98 PTY
6492 ptsname_r NEW: Unix98 PTY
6494 putchar_locked REMOVED
6495 putgrent NEW: GNU ext.
6497 putpmsg NEW: STREAMS
6498 pututxline NEW: Unix98
6502 readdir64_r NEW: LFS
6503 remquo NEW: ISO C 9x
6504 remquof NEW: ISO C 9x
6505 remquol NEW: ISO C 9x
6507 roundf NEW: ISO C 9x
6508 roundl NEW: ISO C 9x
6510 scalbln NEW: ISO C 9x
6511 scalblnf NEW: ISO C 9x
6512 scalblnl NEW: ISO C 9x
6514 sendfile NEW: kernel
6515 setcontext NEW: Unix98
6516 setrlimit64 NEW: LFS
6517 setutxent NEW: Unix98
6519 sigignore NEW: Unix98
6520 sigqueue NEW: POSIX.1b
6521 sigrelse NEW: Unix98
6522 sigset NEW: POSIX.1b
6523 sigtimedwait NEW: POSIX.1b
6524 sigwaitinfo NEW: POSIX.1b
6525 sincos NEW: GNU ext.
6526 sincosf NEW: GNU ext.
6527 sincosl NEW: GNU ext.
6531 strcasestr NEW: GNU ext.
6532 strtoimax NEW: ISO C 9x
6533 strtoumax NEW: ISO C 9x
6534 strverscmp NEW: GNU ext.
6535 svcauthdes_stats NEW: Secure RPC
6536 svcunix_create NEW: sunrpc etx
6537 svcunixfd_create NEW: sunrpc ext
6538 swapcontext NEW: Unix98
6539 tcgetsid NEW: Unix98 PTY
6540 tdestroy NEW: GNU ext.
6541 tgamma NEW: ISO C 9x
6542 tgammaf NEW: ISO C 9x
6543 tgammal NEW: ISO C 9x
6547 truncf NEW: ISO C 9x
6548 truncl NEW: ISO C 9x
6550 unlockpt NEW: Unix98 PTY
6551 updwtmpx NEW: Unix98
6552 user2netname NEW: Secure RPC
6553 utmpxname NEW: Unix98
6554 versionsort NEW: GNU ext.
6555 versionsort64 NEW: GNU ext.
6557 wcscasecmp NEW: GNU ext.
6558 wcsncasecmp NEW: GNU ext.
6559 wcsnlen NEW: GNU ext.
6560 wcstoimax NEW: ISO C 9x
6561 wcstoll NEW: ISO C 9x
6562 wcstoull NEW: ISO C 9x
6563 wcstoumax NEW: ISO C 9x
6565 wordexp NEW: POSIX.2
6566 wordfree NEW: POSIX.2
6567 write_profiling REMOVED
6568 xdecrypt NEW: Secure RPC
6569 xdr_authdes_cred NEW: Secure RPC
6570 xdr_authdes_verf NEW: Secure RPC
6571 xdr_cryptkeyarg NEW: Secure RPC
6572 xdr_cryptkeyarg2 NEW: Secure RPC
6573 xdr_cryptkeyres NEW: Secure RPC
6574 xdr_getcredres NEW: Secure RPC
6575 xdr_key_netstarg NEW: Secure RPC
6576 xdr_key_netstres NEW: Secure RPC
6577 xdr_keybuf NEW: Secure RPC
6578 xdr_keystatus NEW: Secure RPC
6579 xdr_netnamestr NEW: Secure RPC
6580 xdr_sizeof NEW: Secure RPC
6581 xdr_unixcred NEW: sunrpc ext
6582 xencrypt NEW: Secure RPC
6583 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6594 * inet_ntoa is thread-safe
6596 * updwtmp is moved from libutil to libc
6598 * rewrite of cbrt function
6600 * update of timezone data
6614 * add atoll function
6616 * fix complex problems in Berkeley DB code
6618 * fix math functions
6622 * fixed lots of header problems (especially Linux/GNU specific)
6624 * dynamic loader preserves all registers
6626 * Roland McGrath provided support for handling of auxiliary objects in
6627 the ELF dynamic loader.
6629 * support for parallel builds is improved
6633 * GNU extensions are no longer declared by default. To enable them you
6634 must define the macro `_GNU_SOURCE' in your program or compile with
6637 * The library has changed from using GNU ld symbol aliases to using weak
6638 symbols where available. The ELF object file format supports weak
6639 symbols; GNU ld also supports weak symbols in the a.out format. (There
6640 is also now support for other GNU ld extensions in ELF. Use the
6641 `--with-elf' option to configure to indicate you have ELF, and
6642 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6643 of many files which contained only symbol aliases, reducing the size of
6644 the source and the compiled library; many other files were renamed to
6645 less cryptic names previously occupied by the symbol alias files.
6646 There is a new header file <elf.h> for programs which operate on
6647 files in the ELF format.
6649 * Converted to Autoconf version 2, so `configure' has more options.
6650 Run `configure --help' to see the details.
6652 * The library can now be configured to build profiling, highly-optimized
6653 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6654 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6655 `configure' enable building these extra libraries. The shared library is
6656 built by default when using both ELF and GNU ld. When shared libraries
6657 are enabled, the new library `-ldl' is available for arbitrary run-time
6658 loading of shared objects; its interface is defined in <dlfcn.h>. The
6659 new header file <link.h> gives access to the internals of the run-time
6660 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6661 application of same name on other systems and it provides information
6662 about dynamically linked binaries.
6664 * The C library now provides the run-time support code for profiling
6665 executables compiled with `-pg'. Programs can control the profiling code
6666 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6667 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6668 the support for this file format was contributed by David Mosberger-Tang.
6670 * The math code has been replaced with a math library based on fdlibm from
6671 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6672 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6673 functions. The math functions now reside in a separate library, so
6674 programs using them will need to use `-lm' their linking commands.
6676 * John C. Bowman contributed optimized ix87 assembler inline functions.
6678 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6679 mechanism similar to that found in Solaris 2. This is now used for the
6680 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6681 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6682 file controls what services are used for each individual database. This
6683 works by loading shared libraries with names specified in `nsswitch.conf',
6684 so service modules can be changed or added at any time without even
6685 relinking any program. Currently there are the file, db, and NIS based
6686 NSS services available.
6688 * The new functions `strtoq' and `strtouq' parse integer values from
6689 strings, like `strtol' and `strtoul', but they return `long long int' and
6690 `unsigned long long int' values, respectively (64-bit quantities).
6692 * The new functions `strtof' and `strtold' parse floating-point values from
6693 strings, like `strtod', but they return `float' and `long double' values,
6694 respectively (on some machines `double' and `long double' are the same).
6696 * Ulrich Drepper has contributed new implementations of the floating-point
6697 printing and reading code used in the `printf' family of functions and
6698 `strtod', `strtof', and `strtold'. These new functions are perfectly
6699 accurate, and much faster than the old ones.
6701 * The implementation of the POSIX locale model was completely rewritten by
6702 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6703 to compile the POSIX locale definition.
6705 * The former dummy implementations of the strcoll and strxfrm function are
6706 now replaced by fully functional code contributed by Ulrich Drepper. The
6707 collation information comes from the POSIX locale definitions.
6709 * The new header <langinfo.h> defines an interface for accessing
6710 various locale-dependent data (using the locale chosen with `setlocale').
6712 * Ulrich Drepper has contributed a new suite of functions for operation on
6713 wide-character and multibyte-character strings, in <wchar.h>;
6714 and classification and case conversion of wide characters, in <wctype.h>.
6715 These new functions are conforming to the ISO C, Amendement 1 specification.
6717 * There is now a second implementation of the standard I/O library available.
6718 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6719 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6721 * You can now use positional parameter specifications in format strings
6722 for the `printf' and `scanf' families of functions. For example,
6723 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6724 ``Number 6, Mr Jones''. This is mainly useful when providing different
6725 format strings for different languages, whose grammars may dictate
6726 different orderings of the values being printed. To support this
6727 feature, the interface for `register_printf_handler' has changed; see
6728 the header file <printf.h> for details.
6730 * The `printf' and `scanf' families of functions now understand a new
6731 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6732 to group numbers as indicated by the locale; for `scanf' and friends, this
6733 says to accept as valid only a number with all the proper grouping
6734 separators in the right places. In the default "C" locale, numbers are
6735 not grouped; but locales for specific countries will define the usual
6736 conventions (i.e. separate thousands with `,' in the US locale).
6738 * The pgrp functions have been regularized, slightly incompatibly but much
6739 less confusingly. The core functions are now `getpgid' and `setpgid',
6740 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6741 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6742 provided for compatibility. There is no longer an incompatible `getpgrp'
6743 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6745 * The new header file <fts.h> and suite of functions simplify programs that
6746 operate on directory trees. This code comes from 4.4 BSD.
6748 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6749 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6750 NSS scheme used in glibc.
6752 * There is a new malloc debugging hook `__memalign_hook'.
6754 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6755 `unsigned int' in <sys/types.h>. These are for compatibility only and
6756 their use is discouraged.
6758 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6759 done differently, so that it works even without GNU ld.
6761 * New function `euidaccess' checks allowed access to a file like `access',
6762 but using the effective IDs instead of the real IDs.
6764 * The time zone data files have been updated for the latest and greatest
6765 local time conventions of the countries of the world.
6767 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6770 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6771 for formatting floating-point numbers. They are provided only for
6772 compatibility; new programs should use `sprintf' instead. There are
6773 also equivalent function for the `long double' floating-point type and
6774 all functions also exist in a reentrant form.
6776 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6777 functions for maintaining the login-record files (primarily of use to
6778 system programs such as `login'), and convenient functions for
6779 allocating and initializing a pseudo-terminal (pty) device.
6781 * Ulrich Drepper has contributed new support for System V style
6782 shared memory and IPC on systems that support it.
6784 * Ulrich Drepper has contributed several miscellaneous new functions found
6785 in System V: The `hsearch' family of functions provide an effective
6786 implementation of hash tables; `a64l' and `l64a' provide a very simple
6787 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6790 * Ulrich Drepper has contributed new reentrant counterparts for the
6791 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6793 * Ulrich Drepper has contributed new, highly-optimized versions of several
6794 string functions for the i486/Pentium family of processors.
6796 * Ulrich Drepper has updated the Linux-specific code, based largely
6797 on work done in Hongjiu Lu's version of GNU libc for Linux.
6798 The GNU library now supports Linux versions 2.0.10 and later,
6799 using the ELF object file format (i[3456]86-*-linux).
6801 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6803 * David Mosberger-Tang and Richard Henderson have ported the C library
6804 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6805 dynamic linking support for ELF/Alpha.
6807 * Richard Henderson contributed several Alpha optimized assembler function
6808 for arithmetic and string handling.
6810 * Ulrich Drepper has contributed a new set of message catalog functions to
6811 support multiple languages using the <libintl.h> interface, for use with
6812 his new package GNU gettext. Translation volunteers have contributed
6813 catalogs of the library's messages in Spanish, German, and Korean.
6815 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6816 program and the `catgets' function for reading the catalog files it
6817 creates. (The <libintl.h> interface is preferred; we include the
6818 <nl_types.h> interface using `catgets' only for source compatibility with
6819 programs already written to use it.)
6821 * New header file <values.h> gives SVID-compatible names for <limits.h>
6824 * Various new macros, declarations, and small header files for compatibility
6827 * New function `group_member' is a convenient way to check if a process has
6828 a given effective group ID.
6830 * When using GCC 2.7 and later, the socket functions are now declared in a
6831 special way so that passing an argument of type `struct sockaddr_in *',
6832 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6833 `struct sockaddr *' type, does not generate a type-clash warning.
6835 * New function `error' declared in header file <error.h> is a convenient
6836 function for printing error messages and optionally exiting; this is the
6837 canonical function used in GNU programs. The new functions `err', `warn',
6838 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6839 doing the same thing.
6841 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6842 POSIX.2 `glob' function to do ~ and {...} expansion.
6844 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6845 `clearenv' which is used in POSIX.9 is also available.
6847 * New function `getsid' returns session ID number on systems that support it.
6849 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6850 files <db.h> and <mpool.h> provide a rich set of functions for several
6851 types of simple databases stored in memory and in files, and <ndbm.h> is
6852 an old `ndbm'-compatible interface using the `db' functions. Link with
6853 `-ldb' to get these functions.
6855 * New macro `strdupa' copies a string like `strdup', but uses local stack
6856 space from `alloca' instead of dynamic heap space from `malloc'.
6858 * New function `strnlen' is like `strlen' but searches only a given maximum
6859 number of characters for the null terminator. `stpncpy', `strndup' and
6860 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6863 * New function `statfs' in header <sys/statfs.h>.
6865 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6866 provide convenient functions for operating on blocks of null-terminated
6869 * A new suite of functions in <utmp.h> handle all the details of reading
6870 and writing the utmp file.
6872 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6875 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6876 completely POSIX compliant and also implemented the extended functionality
6877 to handle alternate digit representation and alternate era date formats.
6879 * Ulrich Drepper provided an implementation of the `strptime' function
6880 defined in XPG4.2 which transforms a string into a `struct tm' value.
6882 * Paul Eggert provided the tzselect shell script as part of the timezone
6883 code. The shell script makes it easy to select the correct timezone
6886 * The implementation of the malloc family of functions is completely replaced
6887 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6888 The implementation uses the mmap function (if available) and it is
6889 optimized for the use in multi threaded programs.
6891 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6892 functions. This new functionality is usable by specifying a special
6893 salt string and it is compatible with implementation on *BSD systems.
6895 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6896 `getsubopt' to handle second level command line options, `bsd_signal'
6897 to access BSD style `signal' functionality, the obsolete `regexp' style
6900 * the `lchown' function is available on system which support this
6903 * The implementation of the shadow password handling function was contributed
6906 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6908 * POSIX.1g support was added. The <sys/select.h> header is available,
6909 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6910 implementation of `getaddrinfo'.
6914 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6916 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6917 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6919 * The new function `daemon' from 4.4 BSD is useful for server programs that
6920 want to put themselves in the background.
6922 * Joel Sherrill has contributed support for several standalone boards that
6923 run without an operating system.
6925 * `printf', `scanf' and friends now accept a `q' type modifier for long
6926 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6928 * All of the code taken from BSD (notably most of the math and networking
6929 routines) has been updated from the BSD 4.4-Lite release.
6931 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6933 * The new functions `getdomainname' and `setdomainname' fetch or change the
6934 YP/NIS domain name. These are system calls which exist on systems which
6937 * The time zone data files have been updated for the latest international
6940 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6941 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6945 * The C library now includes support for Sun RPC, from Sun's free
6946 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6947 are included. (There is still no support for YP.)
6949 * Tom Quinn has contributed a port of the C library to SGI machines running
6950 Irix 4 (mips-sgi-irix4).
6952 * The new `lockf' function is a simplified interface to the locking
6953 facilities of `fcntl', included for compatibility.
6955 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6957 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6959 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6962 * The error message printed by `assert' for a failed assertion now includes
6963 the name of the program (if using GNU ld) and the name of the calling
6964 function (with versions of GCC that support this).
6966 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6968 * The library now includes the <sys/mman.h> header file and memory
6969 management functions `mmap', `munmap', `mprotect', `msync', and
6970 `madvise', on systems that support those facilities.
6972 * The interface for `mcheck' has changed slightly: the function called to
6973 abort the program when an allocation inconsistency is detected now takes
6974 an argument that indicates the type of failure. The new function
6975 `mprobe' lets you request a consistency check for a particular block at
6976 any time (checks are normally done only when you call `free' or `realloc'
6979 * It is now possible to easily cross-compile the C library, building on one
6980 system a library to run on another machine and/or operating system. All
6981 you need to do is set the variable `HOST_CC' in `configparms' to the
6982 native compiler for programs to run on the machine you are building on (a
6983 few generator programs are used on Unix systems); set `CC' to the
6986 * The new function `fexecve' (only implemented on the GNU system) executes
6987 a program file given a file descriptor already open on the file.
6991 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6992 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6994 * You can set the variable `libprefix' in `configparms' to specify a prefix
6995 to be prepended to installed library files; this makes it easy to install
6996 the GNU C library to be linked as `-lgnuc' or whatever.
6998 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6999 copies a limited number of characters from a string, and returns the
7000 address of the last character written.
7002 * You no longer need to check for whether the installed `stddef.h' is
7003 compatible with the GNU C library. configure now checks for you.
7005 * You can now define a per-stream `fileno' function to convert the
7006 stream's cookie into an integral file descriptor.
7008 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7009 allocates zero bytes of storage, and returns a unique pointer which
7010 you can pass to `realloc' or `free'. The behavior is undefined if
7011 you dereference this pointer.
7013 * The C library now runs on Sony NEWS m68k machines running either
7014 NewsOS 3 or NewsOS 4.
7016 * The new `syscall' function is a system-dependent primitive function
7017 for invoking system calls. It has the canonical behavior on Unix
7018 systems, including unreliable return values for some calls (such as
7019 `pipe', `fork' and `getppid').
7021 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7022 to `EAGAIN', which is the preferred name. On systems whose kernels
7023 use two distinct codes, the C library now translates EWOULDBLOCK to
7024 EAGAIN in every system call function.
7028 * The GNU C Library Reference Manual is now distributed with the library.
7029 `make dvi' will produce a DVI file of the printed manual.
7030 `make info' will produce Info files that you can read on line using C-h i
7031 in Emacs or the `info' program.
7032 Please send comments on the manual to bug-glibc-manual@gnu.org.
7034 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7036 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7038 * Jason Merrill has contributed a port to the Sequent Symmetry running
7039 Dynix version 3 (i386-sequent-dynix).
7041 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7042 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7044 * New function `memory_warnings' lets you arrange to get warnings when
7045 malloc is running out of memory to allocate, like Emacs gives you.
7047 * The C library now contains the relocating allocator used in Emacs 19 for
7048 its editing buffers. This allocator (ralloc) minimizes allocation
7049 overhead and fragmentation by moving allocated regions around whenever it
7050 needs to. You always refer to a ralloc'd region with a "handle" (a
7051 pointer to a pointer--an object of type `void **').
7053 * There is a new `printf' format: `%m' gives you the string corresponding
7054 to the error code in `errno'.
7056 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7057 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7058 pass, the `a' modifier says to fill in a `char **' you pass with a
7061 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7062 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7063 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7065 * `mkstemp' is a traditional Unix function to atomically create and open a
7066 uniquely-named temporary file.
7070 * The standard location for the file that says what the local timezone is
7071 has changed again. It is now `/usr/local/etc/localtime' (or more
7072 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7074 * The distribution no longer contains any files with names longer than 14
7077 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7078 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7080 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7084 * The configuration process has changed quite a bit. The `configure'
7085 script is now used just like the configuration scripts for other GNU
7086 packages. The `sysdeps' directory hierarchy is much rearranged.
7087 The file `INSTALL' explains the new scheme in detail.
7089 * The header files no longer need to be processed into ANSI C and
7090 traditional C versions. There is just one set of files to install, and
7091 it will work with ANSI or old C compilers (including `gcc -traditional').
7093 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7094 MIPS DECStation running Ultrix 4.
7096 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7097 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7098 made itself into a shared library.
7100 * Yet further improved support for the i386, running 4.3 BSD-like systems
7101 (such as Mach 3 with the Unix single-server), or System V.
7103 * New function `strncasecmp' to do case-insensitive string comparison
7104 with limited length.
7106 * New function `strsep' is a reentrant alternative to `strtok'.
7108 * New functions `scandir' and `alphasort' for searching directories.
7110 * New function `setenv' is a better interface to `putenv'.
7112 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7113 function for traversing a directory tree.
7115 * The GNU obstack package is now also part of the C library.
7116 The new function `open_obstack_stream' creates a stdio stream that
7117 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7118 formatted output directly to an obstack.
7120 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7121 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7123 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7125 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7126 things to your strings.
7128 * There are some new test programs: test-fseek, testmb, and testrand.
7130 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7131 These ports are not finished, but are a good starting place for really
7132 supporting those systems.
7134 * `/etc/localtime' is now the standard location for the file that says what
7135 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7136 This follows the general principle that `/etc' is the place for all local
7137 configuration files.
7139 * The C library header files now use `extern "C"' when used by the C++
7140 compiler, so the C library should now work with C++ code.
7142 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7143 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7146 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7147 function which uses the `merge sort' algorithm, and is said to be
7148 significantly faster than the old GNU `qsort' function. Merge sort is
7149 now the standard `qsort' function. The new algorithm can require a lot
7150 of temporary storage; so, the old sorting function is called when the
7151 required storage is not available.
7153 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7154 provides the Unix `crypt' function, plus some other entry points.
7156 * The code and header files taken from 4.4 BSD have been updated with the
7157 latest files released from Berkeley.
7159 ----------------------------------------------------------------------
7162 Permission is granted to anyone to make or distribute verbatim copies
7163 of this document as received, in any medium, provided that the
7164 copyright notice and this permission notice are preserved,
7165 thus giving the recipient permission to redistribute in turn.
7167 Permission is granted to distribute modified versions
7168 of this document, or of portions of it,
7169 under the above conditions, provided also that they
7170 carry prominent notices stating who last changed them.
7173 version-control: never