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 Deprecated and removed features, and other changes affecting compatibility:
65 * Support for prelink will be removed in the next release; this includes
66 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
67 variables and their functionality in the dynamic loader.
69 * The Linux kernel version check has been removed along with the
70 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
71 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
72 when libc.so is issued directly.
74 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
76 Changes to build and runtime requirements:
78 [Add changes to build and runtime requirements here]
80 Security related changes:
82 [Add security related changes here]
84 The following bugs are resolved with this release:
86 [The release manager will add the list generated by
87 scripts/list-fixed-bugs.py just before the release.]
94 * Unicode 14.0.0 Support: Character encoding, character type info, and
95 transliteration tables are all updated to Unicode 14.0.0, using
96 generator scripts contributed by Mike FABIAN (Red Hat).
98 * Bump r_version in the debugger interface to 2 and add a new field,
99 r_next, support multiple namespaces.
101 * Support for the C.UTF-8 locale has been added to glibc. The locale
102 supports full code-point sorting for all valid Unicode code points. A
103 limitation in the framework for fnmatch, regexec, and regcomp requires
104 a compromise to save space and only ASCII-based range expressions are
105 supported for now (see bug 28255). The full size of the locale is
106 only ~400KiB, with 346KiB coming from LC_CTYPE information for
107 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
108 in various downstream distributions. The locale is not built into
109 glibc, and must be installed.
111 * <math.h> functions that round their results to a narrower type, and
112 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
113 18661-3:2015 and draft ISO C2X:
115 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
116 fMxsqrtfN and fMxsqrtfNx functions.
118 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
121 * <math.h> functions for floating-point maximum and minimum,
122 corresponding to new operations in IEEE 754-2019, and corresponding
123 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
124 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
125 fminimum_mag, fminimum_mag_num and corresponding functions for float,
126 long double, _FloatN and _FloatNx.
128 * <math.h> macros for single-precision float constants are added as a
129 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
130 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
133 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
134 predefined as specified in TS 18661-1:2014.
136 * The exp10 functions in <math.h> now have a corresponding type-generic
139 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
141 * printf-family functions now support the %b format for output of
142 integers in binary, as specified in draft ISO C2X, and the %B variant
143 of that format recommended by draft ISO C2X.
145 * A new DSO sorting algorithm has been added in the dynamic linker that uses
146 topological sorting by depth-first search (DFS), solving performance issues
147 of the existing sorting algorithm when encountering particular circular
148 object dependency cases.
150 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
151 the two DSO sorting algorithms. The default setting of '2' uses the
152 new DFS-based algorithm. The setting '1' switches to the old
153 algorithm used in glibc 2.33 and earlier.
155 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
156 to be used by compilers for optimizing usage of 'memcmp' when its
157 return value is only used for its boolean status.
159 * Support for automatically registering threads with the Linux rseq
160 system call has been added. This system call is implemented starting
161 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
162 operations on per-cpu data. It allows user-space to perform updates
163 on per-cpu data without requiring heavy-weight atomic operations.
164 Automatically registering threads allows all libraries, including
165 libc, to make immediate use of the rseq support by using the
166 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
167 variables. The GNU C Library manual has details on integration of
168 Restartable Sequences.
170 * A symbolic link to the dynamic linker is now installed under
171 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
173 * All programs and the testsuite in glibc are now built as position independent
174 executables (PIE) by default on toolchains and architectures that support it.
175 Further, if the toolchain and architecture supports it, even static programs
176 are built as PIE and the resultant glibc can be used to build static PIE
177 executables. A new option --disable-default-pie has been added to disable
178 this behavior and get a non-PIE build. This option replaces
179 --enable-static-pie, which no longer has any effect on the build
182 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
183 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
184 or to use huge pages directly with mmap calls with the MAP_HUGETLB
185 flags). The former can improve performance when Transparent Huge Pages
186 is set to 'madvise' mode while the latter uses the system reserved
189 * The printf family of functions now handles the flagged %#m conversion
190 specifier, printing errno as an error constant (similar to strerrorname_np).
192 * The function _dl_find_object has been added. In-process unwinders
193 can use it to efficiently locate unwinding information for a code
196 * Support for OpenRISC running on Linux has been added. This port requires
197 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
202 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
203 64-bit file offsets (LFS default).
205 * A new configure option, --with-rtld-early-cflags, can be used to
206 specify additional compiler flags for building the early startup code
207 of the dynamic linker. On targets which have CPU compatibility
208 checks, this can help to ensure that proper diagnostics are printed if
209 the dynamic loader runs on an incompatible CPU.
211 * On Linux, the epoll_pwait2 function has been added. It is similar to
212 epoll_wait with the difference the timeout has nanoseconds resolution.
214 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
215 enabling posix_spawn and posix_spawnp to set the controlling terminal in
216 the new process in a race free manner. This function is a GNU extension.
218 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
219 applications compiling with glibc and gcc 12 and later. Level 3 leverages
220 the __builtin_dynamic_object_size function to deliver additional
221 fortification balanced against additional runtime cost (checking non-constant
224 * The audit libraries will avoid unnecessary slowdown if it is not required
225 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
227 Deprecated and removed features, and other changes affecting compatibility:
229 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
230 has been removed since the first PT_LOAD segment is no longer executable
231 due to defaulting to -z separate-code.
233 * The r_version update in the debugger interface makes the glibc binary
234 incompatible with GDB binaries built without the following commits:
236 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
237 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
239 when audit modules or dlmopen are used.
241 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
243 * The --enable-static-pie option is no longer available. The glibc build
244 configuration script now automatically detects static-pie support in the
245 toolchain and architecture and enables it if available.
247 * The catchsegv script and associated libSegFault.so shared object have
248 been removed. There are widely-deployed out-of-process alternatives for
249 catching coredumps and backtraces.
251 * Support for prelink will be removed in the next release; this includes
252 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
253 variables and their functionality in the dynamic loader.
255 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
256 functionality to obtain the program mapping address can be achieved by
257 using LD_TRACE_LOADED_OBJECTS to value of 2.
259 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
260 support prelink PIE binaries.
262 Changes to build and runtime requirements:
264 * The audit module interface version LAV_CURRENT is increased to enable
265 proper bind-now support. The loader now advertises via the la_symbind
266 flags that PLT trace is not possible. New audit modules require the
267 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
268 modules are still loaded for all targets except aarch64.
270 * The audit interface on aarch64 is extended to support both the indirect
271 result location register (x8) and NEON Q register. Old audit modules are
272 rejected by the loader. Audit modules must be rebuilt to use the newer
273 structure sizes and the latest module interface version for LAV_CURRENT.
275 Security related changes:
277 CVE-2022-23219: Passing an overlong file name to the clnt_create
278 legacy function could result in a stack-based buffer overflow when
279 using the "unix" protocol. Reported by Martin Sebor.
281 CVE-2022-23218: Passing an overlong file name to the svcunix_create
282 legacy function could result in a stack-based buffer overflow.
284 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
285 function could result in a memory leak and potential access of
286 uninitialized memory. Reported by Qualys.
288 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
289 function may result in an off-by-one buffer underflow and overflow
290 when the current working directory is longer than PATH_MAX and also
291 corresponds to the / directory through an unprivileged mount
292 namespace. Reported by Qualys.
294 The following bugs are resolved with this release:
296 [12889] nptl: Race condition in pthread_kill
297 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
298 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
299 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
301 [15333] libc: Use 64-bit stat functions in installed programs
302 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
304 [15971] dynamic-link: No interface for debugger access to libraries
306 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
307 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
308 deeply nested DSO dependencies.
309 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
310 ID whose lifetime has not ended
311 [22542] network: buffer overflow in sunrpc clnt_create
313 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
315 [25947] malloc: memory leak in muntrace
316 [26045] math: fmaxf(inf, nan) does not always work
317 [26108] math: exp10() has problems with <tgmath.h>
318 [26779] build: benign use after realloc at localealias.c:329
319 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
320 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
321 [27945] build: build-many-glibcs.py doesn't configure GCC with
322 --enable-initfini-array
323 [27991] build: x86: sysdeps/x86/configure.ac breaks when
324 libc_cv_include_x86_isa_level is loaded from cache
325 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
326 in __REDIRECT_NTH macro
327 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
328 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
330 [28126] libc: nftw aborts for paths longer than PATH_MAX
331 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
332 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
334 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
335 [28185] math: Inaccurate j0f function (again)
336 [28199] locale: iconvconfig prefix flag behaves differently in glibc
338 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
339 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
341 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
342 [28223] libc: mips: clone does not align stack
343 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
345 [28256] malloc: Conditional jump or move depends on uninitialised
346 value(s) in __GI___tunables_init
347 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
348 spawn5 fail if stray fds are open
349 [28310] libc: Do not use affinity mask for sysconf
350 (_SC_NPROCESSORS_CONF)
351 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
353 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
355 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
356 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
358 [28353] network: Race condition on __opensock
359 [28357] dynamic-link: deadlock between pthread_create and ctors
360 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
361 [28361] nptl: Fix for bug 12889 causes setxid deadlock
362 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
363 [28390] localedata: Update locale data to Unicode 14.0.0
364 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
366 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
368 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
369 to tgkill (getpid (), gettid())
370 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
371 [28457] dynamic-link: Missing reldepmod4.so dependency for
373 [28469] time: linux: struct timex is not correctly set for 32-bit
374 systems with TIMESIZE=64
375 [28470] regex: Buffer read overrun in regular expression searching
376 [28475] string: Incorrect access attribute on memfrob
377 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
378 spurious NUL character on state reset
379 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
381 [28550] dynamic-link: FAIL: tst-dso-
382 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
384 [28554] build: Undefined generate-md5
385 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
387 [28607] nptl: Masked signals are delivered on thread exit
388 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
389 lack of cpu counting /proc fallback with glibc 2.34
390 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
391 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
392 [28648] dynamic-link: Running ld.so on statically linked binaries
394 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
396 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
397 [28678] nptl: nptl/tst-create1 hangs sporadically
398 [28688] dynamic-link: PT_LOAD p_align check is too strict
399 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
401 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
402 timezones generated by tzcode-2021d and later
403 [28713] math: GCC 12 miscompiles libm
404 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
405 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
406 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
407 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
408 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
409 Assertion `GL(dl_rtld_map).l_libname' failed!
410 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
411 [28757] nptl: GDB printer tests failed with new GDB
412 [28765] math: x86_64 libmvec atan2 accuracy
413 [28766] manual: Document libmvec accuracy
414 [28768] network: Buffer overflow in svcunix_create with long pathnames
416 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
418 [28770] libc: Unexpected return value from realpath() for too long
419 results (CVE-2021-3998)
420 [28771] libc: %ebx optimization macros are incompatible with .altmacro
422 [28780] build: --disable-default-pie doesn't work on static programs
423 [28782] libc: x86-64 ISA level for glibc itself is always
425 [28792] glob: possible wrong behaviour with patterns with double [
427 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
428 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
429 empty mon_decimal_point_wc
436 * In order to support smoother in-place-upgrades and to simplify
437 the implementation of the runtime all functionality formerly
438 implemented in the libraries libpthread, libdl, libutil, libanl has
439 been integrated into libc. New applications do not need to link with
440 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
441 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
442 provided, so that the linker options keep working. Applications which
443 have been linked against glibc 2.33 or earlier continue to load the
444 corresponding shared objects (which are now empty). The integration
445 of those libraries into libc means that additional symbols become
446 available by default. This can cause applications that contain weak
447 references to take unexpected code paths that would only have been
448 used in previous glibc versions when e.g. preloading libpthread.so.0,
449 potentially exposing application bugs.
451 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
452 PTHREAD_STACK_MIN is no longer constant and is redefined to
453 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
454 sets for modern architectural features like Arm SVE.
456 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
457 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
458 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
459 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
460 dynamic sized register sets for modern architectural features like
463 * The dynamic linker implements the --list-diagnostics option, printing
464 a dump of information related to IFUNC resolver operation and
465 glibc-hwcaps subdirectory selection.
467 * On Linux, the function execveat has been added. It operates similar to
468 execve and it is is already used to implement fexecve without requiring
469 /proc to be mounted. However, different than fexecve, if the syscall is not
470 supported by the kernel an error is returned instead of trying a fallback.
472 * The ISO C2X function timespec_getres has been added.
474 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
475 C2X, is supported to enable declarations of functions defined in Annex F
476 of C2X. Those declarations are also enabled when
477 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
478 defined, and when _GNU_SOURCE is defined.
480 * On powerpc64*, glibc can now be compiled without scv support using the
481 --disable-scv configure option.
483 * Add support for 64-bit time_t on configurations like x86 where time_t
484 is traditionally 32-bit. Although time_t still defaults to 32-bit on
485 these configurations, this default may change in future versions.
486 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
487 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
488 only enabled for Linux and the full support requires a minimum kernel
491 * The main gconv-modules file in glibc now contains only a small set of
492 essential converter modules and the rest have been moved into a supplementary
493 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
494 in the same GCONV_PATH. Similarly, external converter modules directories
495 may have supplementary configuration files in a gconv-modules.d directory
496 with names ending with .conf to logically classify the converter modules in
499 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
500 to configure the size of the thread stack cache.
502 * The function _Fork has been added as an async-signal-safe fork replacement
503 since Austin Group issue 62 droped the async-signal-safe requirement for
504 fork (and it will be included in the future POSIX standard). The new _Fork
505 function does not run any atfork function neither resets any internal state
506 or lock (such as the malloc one), and only sets up a minimal state required
507 to call async-signal-safe functions (such as raise or execve). This function
508 is currently a GNU extension.
510 * On Linux, the close_range function has been added. It allows efficiently
511 closing a range of file descriptors on recent kernels (version 5.9).
513 * The function closefrom has been added. It closes all file descriptors
514 greater than or equal to a given integer. This function is a GNU extension,
515 although it is also present in other systems.
517 * The posix_spawn_file_actions_addclosefrom_np function has been added,
518 enabling posix_spawn and posix_spawnp to close all file descriptors greater
519 than or equal to a given integer. This function is a GNU extension,
520 although Solaris also provides a similar function.
522 * When invoked explicitly, the dynamic linker now uses the kernel to
523 execute programs that do not have any dynamic dependency (that is,
524 they are statically linked). This feature is Linux-specific.
526 Deprecated and removed features, and other changes affecting compatibility:
528 * The function pthread_mutex_consistent_np has been deprecated; programs
529 should use the equivalent standard function pthread_mutex_consistent
532 * The function pthread_mutexattr_getrobust_np has been deprecated;
533 programs should use the equivalent standard function
534 pthread_mutexattr_getrobust instead.
536 * The function pthread_mutexattr_setrobust_np has been deprecated;
537 programs should use the equivalent standard function
538 pthread_mutexattr_setrobust instead.
540 * The function pthread_yield has been deprecated; programs should use
541 the equivalent standard function sched_yield instead.
543 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
545 * Various rarely-used functions declared in <resolv.h> and
546 <arpa/nameser.h> have been deprecated. Applications are encouraged to
547 use dedicated DNS processing libraries if applicable. For <resolv.h>,
548 this affects the functions dn_count_labels, fp_nquery, fp_query,
549 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
550 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
551 p_type, putlong, putshort, res_hostalias, res_isourserver,
552 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
553 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
554 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
555 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
557 * Various symbols previously defined in libresolv have been moved to libc
558 in order to prepare for libresolv moving entirely into libc (see earlier
559 entry for merging libraries into libc). The symbols __dn_comp,
560 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
561 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
562 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
563 __res_search, __res_send formerly in libresolv have been renamed and no
564 longer have a __ prefix. They are now available in libc.
566 * The pthread cancellation handler is now installed with SA_RESTART and
567 pthread_cancel will always send the internal SIGCANCEL on a cancellation
568 request. It should not be visible to applications since the cancellation
569 handler should either act upon cancellation (if asynchronous cancellation
570 is enabled) or ignore the cancellation internal signal. However there are
571 buggy kernel interfaces (for instance some CIFS versions) that could still
572 see a spurious EINTR error when cancellation interrupts a blocking syscall.
574 * Previously, glibc installed its various shared objects under versioned
575 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
576 were provided as symbolic links. Starting with glibc 2.34, the shared
577 objects are installed under their ABI sonames directly, without
578 symbolic links. This increases compatibility with distribution
579 package managers that delete removed files late during the package
580 upgrade or downgrade process.
582 * The symbols mallwatch and tr_break are now deprecated and no longer used in
583 mtrace. Similar functionality can be achieved by using conditional
584 breakpoints within mtrace functions from within gdb.
586 * The __morecore and __after_morecore_hook malloc hooks and the default
587 implementation __default_morecore have been removed from the API. Existing
588 applications will continue to link against these symbols but the interfaces
589 no longer have any effect on malloc.
591 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
592 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
593 disabled by default in the main C library. Users looking to use these
594 features now need to preload a new debugging DSO libc_malloc_debug.so to get
595 this functionality back.
597 * The deprecated functions malloc_get_state and malloc_set_state have been
598 moved from the core C library into libc_malloc_debug.so. Legacy applications
599 that still use these functions will now need to preload libc_malloc_debug.so
600 in their environment using the LD_PRELOAD environment variable.
602 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
603 __memalign_hook and __free_hook are now removed from the API. Compatibility
604 symbols are present to support legacy programs but new applications can no
605 longer link to these symbols. These hooks no longer have any effect on glibc
606 functionality. The malloc debugging DSO libc_malloc_debug.so currently
607 supports hooks and can be preloaded to get this functionality back for older
608 programs. However this is a transitional measure and may be removed in a
609 future release of the GNU C Library. Users may port away from these hooks by
610 writing and preloading their own malloc interposition library.
612 Changes to build and runtime requirements:
614 * On Linux, the shm_open, sem_open, and related functions now expect the
615 file shared memory file system to be mounted at /dev/shm. These functions
616 no longer search among the system's mount points for a suitable
617 replacement if /dev/shm is not available.
619 Security related changes:
621 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
622 a request for netgroup lookup, may crash due to a double-free,
623 potentially resulting in degraded service or Denial of Service on the
624 local system. Reported by Chris Schanzle.
626 CVE-2021-33574: The mq_notify function has a potential use-after-free
627 issue when using a notification type of SIGEV_THREAD and a thread
628 attribute with a non-default affinity mask.
630 CVE-2021-35942: The wordexp function may overflow the positional
631 parameter number when processing the expansion resulting in a crash.
632 Reported by Philippe Antoine.
634 The following bugs are resolved with this release:
636 [4737] libc: fork is not async-signal-safe
637 [5781] math: Slow dbl-64 sin/cos/sincos for special values
638 [10353] libc: Methods for deleting all file descriptors greater than
639 given integer (closefrom)
640 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
641 name containing multi-byte character(s)
642 [14469] math: Inaccurate j0f function
643 [14470] math: Inaccurate j1f function
644 [14471] math: Inaccurate y0f function
645 [14472] math: Inaccurate y1f function
646 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
648 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
649 crashes if it fails dlsym() twice
650 [15648] nptl: multiple definition of `__lll_lock_wait_private'
651 [16063] nptl: Provide a pthread_once variant in libc directly
652 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
653 [17145] libc: syslog with LOG_CONS leaks console file descriptor
654 [17183] manual: description of ENTRY struct in <search.h> in glibc
656 [18435] nptl: pthread_once hangs when init routine throws an exception
657 [18524] nptl: Missing calloc error checking in
658 __cxa_thread_atexit_impl
659 [19329] dynamic-link: dl-tls.c assert failure at concurrent
660 pthread_create and dlopen
661 [19366] nptl: returning from a thread should disable cancellation
662 [19511] nptl: 8MB memory leak in pthread_create in case of failure
663 when non-root user changes priority
664 [20802] dynamic-link: getauxval NULL pointer dereference after static
666 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
667 [22057] malloc: malloc_usable_size is broken with mcheck
668 [22668] locale: LC_COLLATE: the last character of ellipsis is not
670 [23323] libc: [RFE] CSU startup hardening.
671 [23328] malloc: Remove malloc hooks and ensure related APIs return no
673 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
674 $PLATFORM, $ORIGIN) crashes
675 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
676 [23554] nptl: pthread_getattr_np reports wrong stack size with
678 [24106] libc: Bash interpreter in ldd script is taken from host
679 [24773] dynamic-link: dlerror in an secondary namespace does not use
680 the right free implementation
681 [25036] localedata: Update collation order for Swedish
682 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
683 shm_open to pick wrong directory
684 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
685 crash in IFUNC resolver due to stack canary (--enable-stack-
687 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
688 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
689 [27111] dynamic-link: pthread_create and tls access use link_map
690 objects that may be concurrently freed by dlclose
691 [27132] malloc: memusagestat is linked to system librt, leading to
692 undefined symbols on major version upgrade
693 [27136] dynamic-link: dtv setup at thread creation may leave an entry
695 [27249] libc: libSegFault.so does not output signal number properly
696 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
698 [27318] dynamic-link: glibc fails to load binaries when built with
699 -march=sandybridge: CPU ISA level is lower than required
700 [27343] nss: initgroups() SIGSEGVs when called on a system without
701 nsswich.conf (in a chroot)
702 [27346] dynamic-link: x86: PTWRITE feature check is missing
703 [27389] network: NSS chroot hardening causes regressions in chroot
705 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
706 [27444] libc: sysconf reports unsupported option (-1) for
707 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
708 [27462] nscd: double-free in nscd (CVE-2021-27645)
709 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
710 malloc/tst-malloc-thread-fail
711 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
712 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
714 [27522] glob: glob, glob64 incorrectly marked as __THROW
715 [27555] dynamic-link: Static tests fail with --enable-stack-
717 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
718 information for the current directory
719 [27577] dynamic-link: elf/ld.so --help doesn't work
720 [27605] libc: tunables can't control xsave/xsavec selection in
722 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
723 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
725 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
726 _nss_files_getcanonname_r) from within a dlmopen namespace.
727 [27648] libc: FAIL: misc/tst-select
728 [27650] stdio: vfscanf returns too early if a match is longer than
730 [27651] libc: Performance regression after updating to 2.33
731 [27655] string: Wrong size calculation in string/test-strnlen.c
732 [27706] libc: select fails to update timeout on error
733 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
734 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
735 tries resolving them lazily
736 [27744] nptl: Support different libpthread/ld.so load orders in
738 [27749] libc: Data race __run_exit_handlers
739 [27761] libc: getconf: Segmentation fault when passing '-vq' as
741 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
742 exceeds maximum object size 2147483647
743 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
745 [27872] build: Obsolete configure option --enable-stackguard-
747 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
748 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
749 [27892] libc: powerpc: scv ABI error handling fails to check
751 [27896] nptl: mq_notify does not handle separately allocated thread
752 attributes (CVE-2021-33574)
753 [27901] libc: TEST_STACK_ALIGN doesn't work
754 [27902] libc: The x86-64 clone wrapper fails to align child stack
755 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
756 [27939] libc: aarch64: clone does not align the stack
757 [27968] libc: s390x: clone does not align the stack
758 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
759 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
761 [28028] malloc: malloc: tcache shutdown sequence does not work if the
762 thread never allocated anything
763 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
764 [28064] string: x86_64:wcslen implementation list has wcsnlen
765 [28067] libc: FAIL: posix/tst-spawn5
766 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
767 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
769 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
770 [28089] build: tst-tls20 fails when linker defaults to --as-needed
771 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
773 [28091] network: ns_name_skip may return 0 for domain names without
781 * The dynamic linker accepts the --list-tunables argument which prints
782 all the supported tunables. This option is disable if glibc is
783 configured with tunables disabled (--enable-tunables=no).
785 * The dynamic linker accepts the --argv0 argument and provides opportunity
786 to change argv[0] string.
788 * The dynamic linker loads optimized implementations of shared objects
789 from subdirectories under the glibc-hwcaps directory on the library
790 search path if the system's capabilities meet the requirements for
791 that subdirectory. Initially supported subdirectories include
792 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
793 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
794 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
795 subdirectory names correspond to the vendor-independent x86-64
796 microarchitecture levels defined in the x86-64 psABI supplement.
798 * The new --help option of the dynamic linker provides usage and
799 information and library search path diagnostics.
801 * The mallinfo2 function is added to report statistics as per mallinfo,
802 but with larger field widths to accurately report values that are
803 larger than fit in an integer.
805 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
807 * Support for the RISC-V ISA running on Linux has been expanded to run on
808 32-bit hardware. This is supported for the following ISA and ABI pairs:
814 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
817 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
818 glibc may use additional checks that may have an additional performance
819 overhead. At present these checks are available only on LLVM 9 and later.
820 The latest GCC available at this time (10.2) does not support this level of
823 Deprecated and removed features, and other changes affecting compatibility:
825 * The mallinfo function is marked deprecated. Callers should call
828 * When dlopen is used in statically linked programs, alternative library
829 implementations from HWCAP subdirectories are no longer loaded.
830 Instead, the default implementation is used.
832 * The deprecated <sys/vtimes.h> header and the function vtimes have been
833 removed. To support old binaries, the vtimes function continues to exist
834 as a compatibility symbol. Applications should use the getrlimit or
837 * Following a change in the tzdata 2018a release upstream, the zdump
838 program is now installed in the /usr/bin subdirectory. Previously,
839 the /usr/sbin subdirectory was used.
841 * On s390(x), the type float_t is now derived from the macro
842 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
843 hardcoded to double. This does not affect the ABI of any libraries
844 that are part of the GNU C Library, but may affect the ABI of other
845 libraries that use this type in their interfaces. The new definition
846 improves consistency with compiler behavior in many scenarios.
848 * A future version of glibc will stop loading shared objects from the
849 "tls" subdirectories on the library search path, the subdirectory that
850 corresponds to the AT_PLATFORM system name, and also stop employing
851 the legacy AT_HWCAP search mechanism. Applications should switch to
852 the new glibc-hwcaps mechanism instead; if they do not do that, only
853 the baseline version (directly from the search path directory) will be
856 Changes to build and runtime requirements:
858 * On Linux, the system administrator needs to configure /dev/pts with
859 the intended access modes for pseudo-terminals. glibc no longer
860 attemps to adjust permissions of terminal devices. The previous glibc
861 defaults ("tty" group, user read/write and group write) already
862 corresponded to what most systems used, so that grantpt did not
863 perform any adjustments.
865 * On Linux, the posix_openpt and getpt functions no longer attempt to
866 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
867 (and pseudo-terminals are supported), a devpts file system is mounted
868 on /dev/pts. Current systems already meet these requirements.
870 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
872 Security related changes:
874 CVE-2021-3326: An assertion failure during conversion from the
875 ISO-20220-JP-3 character set using the iconv function has been fixed.
876 This assertion was triggered by certain valid inputs in which the
877 converted output contains a combined sequence of two wide characters
878 crossing a buffer boundary. Reported by Tavis Ormandy.
880 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
881 invoked with input containing redundant shift sequences in the IBM1364,
882 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
884 CVE-2020-29562: An assertion failure has been fixed in the iconv function
885 when invoked with UCS4 input containing an invalid character.
887 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
888 invoked with EUC-KR input containing invalid multibyte input sequences.
890 The following bugs are resolved with this release:
892 [10635] libc: realpath portability patches
893 [16124] dynamic-link: ld.so should allow to change argv[0]
894 [17924] malloc: 'free' should not set errno
895 [18683] libc: Linux faccessat implementation can incorrectly ignore
897 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
898 [23091] hurd: missing waitid support
899 [23249] libc: Epyc and other current AMD CPUs do not select the
900 "haswell" platform subdirectory
901 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
903 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
905 [24941] libc: Make grantpt usable after multi-threaded fork in more
907 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
908 [24973] locale: iconv encounters segmentation fault when converting
909 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
910 [25399] string: undefined reference to `__warn_memset_zero_len' when
911 changing gnuc version
912 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
914 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
916 [25971] libc: s390 bits/hwcap.h out of sync with kernel
917 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
918 [26100] libc: Race in syslog(3) with regards to tag printing.
919 [26124] libc: Export <cpu-features.h>
920 [26130] nscd: Inconsistent nscd cache during pruning
921 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
922 [26224] locale: iconv hangs when converting some invalid inputs from
923 several IBM character sets (CVE-2020-27618)
924 [26341] libc: realpath cyclically call __alloca(path_max) to consume
926 [26343] manual: invalid documented return type for strerrorname_np(),
927 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
928 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
930 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
932 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
933 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
935 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
936 [26553] libc: mtx_init allows type set to "mtx_recursive" only
937 [26555] string: strerrorname_np does not return the documented value
938 [26592] libc: pointer arithmetic overflows in realpath
939 [26600] network: Transaction ID collisions cause slow DNS lookups in
941 [26606] libc: [2.33 Regression] pselect is broken on x32
942 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
943 [26620] glob: fnmatch with collating symbols results in segmentation
945 [26625] libc: [2.33 Regression] CET is disabled
946 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
947 at the end of a memory mapping
948 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
949 by the caller to the kernel
950 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
951 [26647] build: [-Werror=array-parameter=] due to different
952 declarations for __sigsetjmp
953 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
955 [26649] stdio: printf should handle non-normal x86 long double numbers
956 gracefully (CVE-2020-29573)
957 [26686] build: -Warray-parameter instances building with GCC 11
958 [26687] build: -Warray-bounds instances building with GCC 11
959 [26690] stdio: Aliasing violation in __vfscanf_internal
960 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
961 [26726] build: GCC warning calling new_composite_name with an array of
963 [26736] libc: FAIL: misc/tst-sysvshm-linux
964 [26737] libc: Random FAIL: rt/tst-shm
965 [26791] libc: Missing O_CLOEXEC in sysconf.c
966 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
968 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
970 [26818] string: aarch64: string tests may run ifunc variants that are
972 [26821] libc: Memory leak test failures on Fedora 33
973 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
974 FSGSBASE/LM/RDRAND check failure
975 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
977 [26853] libc: aarch64: Missing unwind information in statically linked
979 [26923] locale: Assertion failure in iconv when converting invalid
980 UCS4 (CVE-2020-29562)
981 [26926] dynamic-link: aarch64: library dependencies are not bti
983 [26932] libc: sh: Multiple floating point functions defined as stubs
985 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
987 [26988] dynamic-link: aarch64: BTI mprotect address is not page
989 [27002] build: libc_freeres_fn build failure with GCC 11
990 [27004] dynamic-link: ld.so is miscompiled by GCC 11
991 [27008] dynamic-link: ld.so.cache should have endianness markup
992 [27042] libc: [alpha] anonymous union in struct stat confuses
994 [27053] libc: Conformance regression in system(3) (and probably also
996 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
998 [27077] network: Do not reload /etc/nsswitch.conf from chroot
999 [27083] libc: Unsafe unbounded alloca in addmntent
1000 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1002 [27130] string: "rep movsb" performance issue
1003 [27150] libc: alpha: wait4() is unavailable in static linking
1004 [27177] dynamic-link:
1005 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1007 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1008 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1009 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1010 related to combining characters (CVE-2021-3326)
1017 * Unicode 13.0.0 Support: Character encoding, character type info, and
1018 transliteration tables are all updated to Unicode 13.0.0, using
1019 generator scripts contributed by Mike FABIAN (Red Hat).
1021 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1023 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1024 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1025 Three ABIs are supported:
1031 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1032 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1034 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1035 DT_DEPAUDIT dynamic section entries of the main executable.
1037 * powerpc64le supports IEEE128 long double libm/libc redirects when
1038 using -mabi=ieeelongdouble to compile C code on supported GCC
1039 toolchains. It is recommended to use GCC 8 or newer when testing
1042 * To help detect buffer overflows and other out-of-bounds accesses
1043 several APIs have been annotated with GCC 'access' attribute. This
1044 should help GCC 10 issue better warnings.
1046 * On Linux, functions pthread_attr_setsigmask_np and
1047 pthread_attr_getsigmask_np have been added. They allow applications
1048 to specify the signal mask of a thread created with pthread_create.
1050 * The GNU C Library now provides the header file <sys/single_threaded.h>
1051 which declares the variable __libc_single_threaded. Applications are
1052 encouraged to use this variable for single-thread optimizations,
1053 instead of weak references to symbols historically defined in
1056 * The functions sigabbrev_np and sigdescr_np have been added. The
1057 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1058 SIGHUP) while sigdescr_np returns a string describing the signal number
1059 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1060 attempt to translate the return description, both functions return
1061 NULL for an invalid signal number.
1063 They should be used instead of sys_siglist or sys_sigabbrev and they
1064 are both thread and async-signal safe. These functions are GNU extensions.
1066 * The functions strerrorname_np and strerrordesc_np have been added. The
1067 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1068 while strerrordesc_np returns a string describing the error number
1069 (e.g "Invalid argument" for EINVAL). Different than strerror,
1070 strerrordesc_np does not attempt to translate the return description, both
1071 functions return NULL for an invalid error number.
1073 They should be used instead of sys_errlist and sys_nerr, both are
1074 thread and async-signal safe. These functions are GNU extensions.
1076 * AArch64 now supports standard branch protection security hardening
1077 in glibc when it is built with a GCC that is configured with
1078 --enable-standard-branch-protection (or if -mbranch-protection=standard
1079 flag is passed when building both GCC target libraries and glibc,
1080 in either case a custom GCC is needed). This includes branch target
1081 identification (BTI) and pointer authentication for return addresses
1082 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1083 extensions respectively for the protection to be effective,
1084 otherwise the used instructions are nops. User code can use PAC-RET
1085 without libc support, but BTI requires a libc that is built with BTI
1086 support, otherwise runtime objects linked into user code will not be
1089 Deprecated and removed features, and other changes affecting compatibility:
1091 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1092 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1093 RPC header files. Backward compatibility for old programs is kept
1094 only for architectures and ABIs that have been added in or before
1095 glibc 2.31. New programs need to use TI-RPC
1096 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1097 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1099 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1100 as shared library for backward compatibility and the NSS modules "nis"
1101 and "nisplus" are not built at all and libnsl's headers aren't
1102 installed. This compatibility is kept only for architectures and ABIs
1103 that have been added in or before version 2.28. Replacement
1104 implementations based on TI-RPC, which additionally support IPv6, are
1105 available from <https://github.com/thkukuk/>. This change does not
1106 affect the "compat" NSS module, which does not depend on libnsl
1107 since 2.27 and thus can be used without NIS.
1109 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1110 removed. To support old binaries, the sysctl function continues to
1111 exist as a compatibility symbol (on those architectures which had it),
1112 but always fails with ENOSYS. This reflects the removal of the system
1113 call from all architectures, starting with Linux 5.5.
1115 * The sstk function is no longer available to newly linked binaries.
1116 Its implementation always returned with a failure, and the function
1117 was not declared in any header file.
1119 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1120 sigrelse, sigignore and sigset, and the sigmask macro have been
1121 deprecated. Applications should use the sigsuspend, sigprocmask and
1122 sigaction functions instead.
1124 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1125 already supported this format for almost 20 years.
1127 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1128 are no longer available to newly linked binaries, and their declarations
1129 have been removed from <string.h>. They are exported solely as
1130 compatibility symbols to support old binaries. All programs should use
1133 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1134 are no longer available to newly linked binaries, and their declarations
1135 have been removed from <stdio.h>. They are exported solely as
1136 compatibility symbols to support old binaries. All programs should use
1137 strerror or strerror_r instead.
1139 * Both strerror and strerror_l now share the same internal buffer in the
1140 calling thread, meaning that the returned string pointer may be invalided
1141 or contents might be overwritten on subsequent calls in the same thread or
1142 if the thread is terminated. It makes strerror MT-safe.
1144 * Using weak references to libpthread functions such as pthread_create
1145 or pthread_key_create to detect the singled-threaded nature of a
1146 program is an obsolescent feature. Future versions of glibc will
1147 define pthread_create within libc.so.6 itself, so such checks will
1148 always flag the program as multi-threaded. Applications should check
1149 the __libc_single_threaded variable declared in
1150 <sys/single_threaded.h> instead.
1152 * The "files" NSS module no longer supports the "key" database (used for
1153 secure RPC). The contents of the /etc/publickey file will be ignored,
1154 regardless of the settings in /etc/nsswitch.conf. (This method of
1155 storing RPC keys only supported the obsolete and insecure AUTH_DES
1156 flavor of secure RPC.)
1158 * The __morecore and __after_morecore_hook malloc hooks and the default
1159 implementation __default_morecore have been deprecated. Applications
1160 should use malloc interposition to change malloc behavior, and mmap to
1161 allocate anonymous memory. A future version of glibc may require that
1162 applications which use the malloc hooks must preload a special shared
1163 object, to enable the hooks.
1165 * The hesiod NSS module has been deprecated and will be removed in a
1166 future version of glibc. System administrators are encouraged to
1167 switch to other approaches for networked account databases, such as
1170 Changes to build and runtime requirements:
1172 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1173 long double redirects.
1175 Security related changes:
1177 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1178 invoked with the -c option and when processing invalid multi-byte input
1179 sequences. Reported by Jan Engelhardt.
1181 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1182 corruption when they were passed a pseudo-zero argument. Reported by Guido
1183 Vranken / ForAllSecure Mayhem.
1185 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1186 expanding ~user has been fixed.
1188 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1189 memmove functions has been fixed. Discovered by Jason Royes and Samual
1190 Dytrych of the Cisco Security Assessment and Penetration Team (See
1193 The following bugs are resolved with this release:
1195 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1196 [10441] manual: Backtraces code example lacks error checking
1197 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1198 timer_sigev_thread dangerous
1199 [14231] stdio: stdio-common tests memory requirements
1200 [14578] libc: /proc-based emulation for lchmod, fchmodat
1201 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1202 filtee has constructor
1203 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1204 sequences (CVE-2016-10228)
1205 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1206 character entities for infinity & pi
1207 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1208 segfaults in applications
1209 [20543] libc: Please move from .gnu.linkonce to comdat
1210 [22489] network: gcc warns about implicit convertion in
1211 ICMP6_FILTER_SETPASS with -Wsign-conversion
1212 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1213 [23294] math: Complex _FloatN functions are redirected to the wrong
1214 function with -mlong-double-64
1215 [23296] libc: Data race in setting function descriptor during lazy
1217 [23668] dynamic-link: ldconfig: Default to the new format for
1219 [23819] hurd: hurd: Add C11 thread support
1220 [23990] build: test-container error out on failure to exec child.
1221 [23991] build: shell-container typo in run_command_array
1222 [24638] manual: Error in example of parsing a template string
1223 [24654] manual: Wrong declaration of wcschr in libc manual
1224 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1226 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1227 dynamically loaded dsos
1228 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1229 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1231 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1232 restore EAX, ECX and EDX
1233 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1234 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1235 [25420] network: Race condition in resolv_conf.c can result in caching
1236 stale configuration forever
1237 [25487] math: sinl() stack corruption from crafted input
1239 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1241 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1242 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1244 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1245 on 32 bit and old kernel
1246 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1247 [25639] localedata: Some names of days and months wrongly spelt in
1249 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1250 amount of sigset_t bytes
1251 [25691] stdio: printf: memory leak when printing long multibyte
1253 [25715] libc: system() returns wrong errors when posix_spawn fails
1254 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1255 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1256 state for conversions that produce two Unicode code points
1257 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1258 for linux x86_64 leads to livelock
1259 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1260 test failures, invalid instruction in ld.so
1261 [25790] glob: Typo in tst-fnmatch.input
1262 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1264 [25819] localedata: Update locale data to Unicode 13.0.0
1265 [25824] libc: Abnormal function of strnlen in aarch64
1266 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1267 [25896] libc: Incorrect prctl
1268 [25902] libc: Bad LOADARGS_N
1269 [25905] dynamic-link: VSX registers are corrupted during PLT
1270 resolution when glibc is built with --disable-multi-arch and --with-
1272 [25933] string: Off by one error in __strncmp_avx2 when
1273 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1275 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1276 exiting detached thread
1277 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1279 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1281 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1282 [26073] math: getpayload() has wrong return value
1283 [26076] dynamic-link: dlmopen crashes after failing to load
1284 dependencies in audit mode
1285 [26120] localedata: column width of of some Korean
1286 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1287 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1288 [26133] libc: Incorrect need_arch_feature_F16C
1289 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1291 [26149] libc: PKU is usable only if OSPKE is set
1292 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1294 [26208] libc: Incorrect bit_cpu_CLFSH
1295 [26210] network: Incorrect use of hidden symbols for global sunrpc
1297 [26211] stdio: printf integer overflow calculating allocation size
1298 [26214] stdio: printf_fp double free
1299 [26215] stdio: printf_fp memory leak
1300 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1301 [26258] nss: nss_compat should not read input files with mmap
1302 [26332] string: Incorrect cache line size load causes memory
1303 corruption in memset
1310 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1311 enable features from the draft ISO C2X standard. Only some features from
1312 this draft standard are supported by the GNU C Library, and as the draft
1313 is under active development, the set of features enabled by this macro is
1314 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1315 by compiling with "gcc -std=gnu2x".
1317 * The <math.h> functions that round their results to a narrower type now
1318 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1319 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1320 Clarification Request 13 to TS 18661-3.
1322 * The function pthread_clockjoin_np has been added, enabling join with a
1323 terminated thread with a specific clock. It allows waiting against
1324 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1326 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1328 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1329 in queries if the trust-ad option is set via the options directive in
1330 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1331 mode, the AD bit, as provided by the name server, is available to
1332 applications which call res_search and related functions. In the default
1333 mode, the AD bit is not set in queries, and it is automatically cleared in
1334 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1335 servers and the network path to them are treated as untrusted.)
1337 Deprecated and removed features, and other changes affecting compatibility:
1339 * The totalorder and totalordermag functions, and the corresponding
1340 functions for other floating-point types, now take pointer arguments to
1341 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1342 passing. This is in accordance with the resolution of Clarification
1343 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1344 floating-point arguments directly will continue to work.
1346 * The obsolete function stime is no longer available to newly linked
1347 binaries, and its declaration has been removed from <time.h>.
1348 Programs that set the system time should use clock_settime instead.
1350 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1351 in a future version of glibc. In this release, the header still exists
1352 but calling ftime will cause a compiler warning. All programs should use
1353 gettimeofday or clock_gettime instead.
1355 * The gettimeofday function no longer reports information about a
1356 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1357 many years, as it cannot handle the full complexity of the world's
1358 timezones, but hitherto we have supported it on a best-effort basis.
1359 Changes required to support 64-bit time_t on 32-bit architectures have
1360 made this no longer practical.
1362 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1363 should expect to receive a 'struct timezone' whose tz_minuteswest and
1364 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1365 happen on a few Linux-based ports. This will be corrected in a future
1368 All callers should supply a null pointer for the 'tzp' argument to
1369 gettimeofday. For accurate information about the time zone associated
1370 with the current time, use the localtime function.
1372 gettimeofday itself is obsolescent according to POSIX. We have no plans
1373 to remove access to this function, but portable programs should consider
1374 using clock_gettime instead.
1376 * The settimeofday function can still be used to set a system-wide time
1377 zone when the operating system supports it. This is because the Linux
1378 kernel reused the API, on some architectures, to describe a system-wide
1379 time-zone-like offset between the software clock maintained by the kernel,
1380 and the "RTC" clock that keeps time when the system is shut down.
1382 However, to reduce the odds of this offset being set by accident,
1383 settimeofday can no longer be used to set the time and the offset
1384 simultaneously. If both of its two arguments are non-null, the call
1385 will fail (setting errno to EINVAL).
1387 Callers attempting to set this offset should also be prepared for the call
1388 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1389 some Linux architectures. The Linux kernel maintainers are discussing a
1390 more principled replacement for the reused API. After a replacement
1391 becomes available, we will change settimeofday to fail with ENOSYS on all
1392 platforms when its 'tzp' argument is not a null pointer.
1394 settimeofday itself is obsolescent according to POSIX. Programs that set
1395 the system time should use clock_settime and/or the adjtime family of
1396 functions instead. We may cease to make settimeofday available to newly
1397 linked binaries after there is a replacement for Linux's time-zone-like
1400 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1401 the optional CAS instruction is implemented (for instance, LEON processors
1402 are still supported, but SuperSPARC processors are not).
1404 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1407 * If a lazy binding failure happens during dlopen, during the execution of
1408 an ELF constructor, the process is now terminated. Previously, the
1409 dynamic loader would return NULL from dlopen, with the lazy binding error
1410 captured in a dlerror message. In general, this is unsafe because
1411 resetting the stack in an arbitrary function call is not possible.
1413 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1414 executable stack unless explicitly configured at build time to require
1415 minimum kernel version 4.8 or newer. This is because executing
1416 floating-point branches on a non-executable stack on Linux kernels prior to
1417 4.8 can lead to application crashes for some MIPS configurations. While
1418 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1419 expected to enable non-executable stack by default with PT_GNU_STACK by
1420 default and is thus likely to trigger a crash on older kernels.
1422 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1423 non-executable stack while dropping support for older kernels.
1425 * System call wrappers for time system calls now use the new time64 system
1426 calls when available. On 32-bit targets, these wrappers attempt to call
1427 the new system calls first and fall back to the older 32-bit time system
1428 calls if they are not present. This may cause issues in environments
1429 that cannot handle unsupported system calls gracefully by returning
1430 -ENOSYS. Seccomp sandboxes are affected by this issue.
1432 Changes to build and runtime requirements:
1434 * It is no longer necessary to have recent Linux kernel headers to build
1435 working (non-stub) system call wrappers on all architectures except 64-bit
1436 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1438 * The ChangeLog file is no longer present in the toplevel directory of the
1439 source tree. ChangeLog files are located in the ChangeLog.old directory as
1440 ChangeLog.N where the highest N has the latest entries.
1442 Security related changes:
1444 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1445 out-of-bounds write when executed in a signal frame context.
1447 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1448 environment variable during program execution after a security
1449 transition, allowing local attackers to restrict the possible mapping
1450 addresses for loaded libraries and thus bypass ASLR for a setuid
1451 program. Reported by Marcin Kościelnicki.
1453 The following bugs are resolved with this release:
1455 [12031] localedata: iconv -t ascii//translit with Greek characters
1456 [15813] libc: Multiple issues in __gen_tempname
1457 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1458 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1459 [19767] libc: vdso is not used with static linking
1460 [19903] hurd: Shared mappings not being inherited by children processes
1461 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1462 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1464 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1465 Symbols-A/B Unicode blocks
1466 [23518] libc: Eliminate __libc_utmp_jump_table
1467 [24026] malloc: malloc_info() returns wrong numbers
1468 [24054] localedata: Many locales are missing date_fmt
1469 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1470 [24304] dynamic-link: Lazy binding failure during ELF
1471 constructors/destructors is not fatal
1472 [24376] libc: RISC-V symbol size confusion with _start
1473 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1475 [24824] libc: test-in-container does not install charmap files compatible
1477 [24844] regex: regex bad pointer / leakage if malloc fails
1478 [24867] malloc: Unintended malloc_info formatting changes
1479 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1480 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1481 [24882] libc: login: pututline uses potentially outdated cache
1482 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1483 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1485 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1487 [24930] dynamic-link: dlopen of PIE executable can result in
1488 _dl_allocate_tls_init assertion failure
1489 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1490 (stringop-overflow error)
1491 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1492 functions other can lead to crashes
1493 [24967] libc: jemalloc static linking causes runtime failure
1494 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1496 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1497 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1498 [25097] libc: new -Warray-bounds with GCC 10
1499 [25112] dynamic-link: dlopen must not make new objects accessible when it
1500 still can fail with an error
1501 [25139] localedata: Please add the new mnw_MM locale
1502 [25149] regex: Array bounds violation in proceed_next_node
1503 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1504 initialized correctly
1505 [25189] libc: glibc's __glibc_has_include causes issues with clang
1507 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1508 value to an unsigned
1509 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1510 binaries (CVE-2019-19126)
1511 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1513 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1515 [25232] string: <string.h> does not enable const correctness for strchr et
1517 [25233] localedata: Consider "." as the thousands separator for sl_SI
1519 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1520 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1521 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1523 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1524 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1526 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1527 (dl_initfirst) link map pointer
1528 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1529 [25423] libc: Array overflow in backtrace on powerpc
1530 [25425] network: Missing call to __resolv_context_put in
1531 getaddrinfo.c:gethosts
1538 * Unicode 12.1.0 Support: Character encoding, character type info, and
1539 transliteration tables are all updated to Unicode 12.1.0, using
1540 generator scripts contributed by Mike FABIAN (Red Hat).
1542 * The dynamic linker accepts the --preload argument to preload shared
1543 objects, in addition to the LD_PRELOAD environment variable.
1545 * The twalk_r function has been added. It is similar to the existing
1546 twalk function, but it passes an additional caller-supplied argument
1547 to the callback function.
1549 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1551 * Minguo (Republic of China) calendar support has been added as an
1552 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1555 * The entry for the new Japanese era has been added for ja_JP locale.
1557 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1558 pvalloc, memalign, and posix_memalign fail now with total object size
1559 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1560 pointer subtraction within the allocated object, where results might
1561 overflow the ptrdiff_t type.
1563 * The dynamic linker no longer refuses to load objects which reference
1564 versioned symbols whose implementation has moved to a different soname
1565 since the object has been linked. The old error message, symbol
1566 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1567 link time reference, is gone.
1569 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1570 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1571 functions. These behave similarly to their "timed" equivalents, but also
1572 accept a clockid_t parameter to determine which clock their timeout should
1573 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1574 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1575 time of the wait (unlike with pthread_condattr_setclock, which requires
1576 the clock choice at initialization time).
1578 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1579 work, new resolvers can use a second argument which can be extended in
1580 the future, currently it contains the AT_HWCAP2 value.
1582 Deprecated and removed features, and other changes affecting compatibility:
1584 * The copy_file_range function fails with ENOSYS if the kernel does not
1585 support the system call of the same name. Previously, user space
1586 emulation was performed, but its behavior did not match the kernel
1587 behavior, which was deemed too confusing. Applications which use the
1588 copy_file_range function can no longer rely on glibc to provide a fallback
1589 on kernels that do not support the copy_file_range system call, and if
1590 this function returns ENOSYS, they will need to use their own fallback.
1591 Support for copy_file_range for most architectures was added in version
1592 4.5 of the mainline Linux kernel.
1594 * The functions clock_gettime, clock_getres, clock_settime,
1595 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1596 for new applications (on architectures which had them). Instead, the
1597 definitions in libc will be used automatically, which have been available
1600 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1601 and <sys/stropts.h> have been removed.
1603 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1604 resolver flag (deprecated in glibc 2.25) have been removed.
1606 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1607 resolver have been removed from <resolv.h>.
1609 * With --enable-bind-now, installed programs are now linked with the
1612 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1613 configurations) has been removed, following the deprecation of this
1614 subarchitecture in version 8 of GCC, and its removal in version 9.
1616 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1617 header have been removed.
1619 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1620 deprecated and will be removed from a future version of glibc.
1621 Application should directly access /proc instead. For obtaining random
1622 bits, the getentropy function can be used.
1624 Changes to build and runtime requirements:
1626 * GCC 6.2 or later is required to build the GNU C Library.
1628 Older GCC versions and non-GNU compilers are still supported when
1629 compiling programs that use the GNU C Library.
1631 Security related changes:
1633 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1634 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1635 has undefined behavior. On x32, the size_t argument may be passed
1636 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1637 32 bits. When it happened with the sign bit of RDX register set,
1638 memcmp gave the wrong result since it treated the size argument as
1639 zero. Reported by H.J. Lu.
1641 CVE-2019-9169: Attempted case-insensitive regular-expression match
1642 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1643 over-read. Reported by Hongxu Chen.
1645 The following bugs are resolved with this release:
1647 [2872] locale: Transliteration Cyrillic -> ASCII fails
1648 [6399] libc: gettid() should have a wrapper
1649 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1650 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1651 [17396] localedata: globbing for locale by [[.collating-element.]]
1652 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1653 [18465] malloc: memusagestat is built using system C library
1654 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1655 invalid input drops valid char
1656 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1657 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1658 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1659 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1660 [23352] malloc: __malloc_check_init still defined in public header
1662 [23403] nptl: Wrong alignment of TLS variables
1663 [23501] libc: nftw() doesn't return dangling symlink's inode
1664 [23733] malloc: Check the count before calling tcache_get()
1665 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1667 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1668 [23844] nptl: pthread_rwlock_trywrlock results in hang
1669 [23983] argparse: Missing compat versions of argp_failure and argp_error
1670 for long double = double
1671 [23984] libc: Missing compat versions of err.h and error.h functions for
1672 long double = double
1673 [23996] localedata: Dutch salutations
1674 [24040] libc: riscv64: unterminated call chain in __thread_start
1675 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1677 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1678 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1680 [24114] regex: regexec buffer read overrun in "grep -i
1681 '\(\(\)*.\)*\(\)\(\)\1'"
1682 [24122] libc: Segfaults if 0 returned from la_version
1683 [24153] stdio: Some input functions do not react to stdin assignment
1684 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1685 RDX is set) (CVE-2019-7309)
1686 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1687 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1688 not the default "nor"
1689 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1690 false positives, change to modern flexible array
1691 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1692 instructions while maintaining the robust mutex list due to missing
1694 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1695 unnecessary librt dependencies
1696 [24200] localedata: Revert first_weekday removal in en_IE locale
1697 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1698 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1699 [24216] malloc: Check for large bin list corruption when inserting
1701 [24228] stdio: old x86 applications that use legacy libio crash on exit
1702 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1704 [24293] localedata: Missing Minguo calendar support for TW locales
1705 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1706 tt_RU (Tatar) locale
1707 [24307] localedata: Update locale data to Unicode 12.0.0
1708 [24323] dynamic-link: dlopen should not be able open PIE objects
1709 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1710 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1711 tt_RU (Tatar) locale
1712 [24370] localedata: Add lang_name for tt_RU locale
1713 [24372] locale: Binary locale files are not architecture independent
1714 [24394] time: strptime %Ey mis-parses final year of era
1715 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1717 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1719 [24531] malloc: Malloc tunables give tcache assertion failures
1720 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1722 [24535] localedata: Update locale data to Unicode 12.1.0
1723 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1724 kernels and break testing
1725 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1726 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1727 [-Werror=format-overflow=]
1728 [24570] libc: alpha: compat msgctl uses __IPC_64
1729 [24584] locale: Data race in __wcsmbs_clone_conv
1730 [24588] stdio: Remove codecvt vtables from libio
1731 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1733 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1734 [24632] stdio: Old binaries which use freopen with default stdio handles
1736 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1738 [24652] localedata: szl_PL spelling correction
1739 [24695] nss: nss_db: calling getpwent after endpwent crashes
1740 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1741 in /etc/nsswitch.conf
1742 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1743 [24740] libc: getdents64 type confusion
1744 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1745 always implemented in the same library
1746 [24744] libc: Remove copy_file_range emulation
1747 [24757] malloc: memusagestat is linked against system libpthread
1748 [24794] libc: Partial test suite run builds corrupt test-in-container
1756 * The getcpu wrapper function has been added, which returns the currently
1757 used CPU and NUMA node. This function is Linux-specific.
1759 * A new convenience target has been added for distribution maintainers
1760 to build and install all locales as directories with files. The new
1761 target is run by issuing the following command in your build tree:
1762 'make localedata/install-locale-files', with an optional DESTDIR
1763 to set the install root if you wish to install into a non-default
1764 configured location.
1766 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1768 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1769 for _GNU_SOURCE, to match BSD environments.
1771 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1772 indicates that it will abort the transaction prior to entering the kernel
1773 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1774 suspended, and this caused some undefined side-effects issues by aborting
1775 transactions manually. Glibc avoided it by abort transactions manually on
1776 each syscall, but it lead to performance issues on newer kernels where the
1777 HTM state is saved and restore lazily (the state being saved even when the
1778 process actually does not use HTM).
1780 * The functions posix_spawn_file_actions_addchdir_np and
1781 posix_spawn_file_actions_addfchdir_np have been added, enabling
1782 posix_spawn and posix_spawnp to run the new process in a different
1783 directory. These functions are GNU extensions. The function
1784 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1787 * The popen and system do not run atfork handlers anymore (BZ#17490).
1788 Although it is a possible POSIX violation, the POSIX rationale in
1789 pthread_atfork documentation regarding atfork handlers is to handle
1790 inconsistent mutex state after a fork call in a multi-threaded process.
1791 In both popen and system there is no direct access to user-defined mutexes.
1793 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1794 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1796 - C-SKY ABIV2 soft-float little-endian
1797 - C-SKY ABIV2 hard-float little-endian
1799 * strftime's default formatting of a locale's alternative year (%Ey)
1800 has been changed to zero-pad the year to a minimum of two digits,
1801 like "%y". This improves the display of Japanese era years during
1802 the first nine years of a new era, and is expected to be harmless
1803 for all other locales (only Japanese locales regularly have
1804 alternative year numbers less than 10). Zero-padding can be
1805 overridden with the '_' or '-' flags (which are GNU extensions).
1807 * As a GNU extension, the '_' and '-' flags can now be applied to
1808 "%EY" to control how the year number is formatted; they have the
1809 same effect that they would on "%Ey".
1811 Deprecated and removed features, and other changes affecting compatibility:
1813 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1814 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1816 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1817 in <sys/procfs.h>, has been corrected to match the type actually used by
1818 the Linux kernel. This affects the size and layout of that structure on
1819 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1821 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1822 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1823 defined in <sys/procfs.h>, has been corrected to match the type actually
1824 used by the Linux kernel. This affects the size and layout of those
1827 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1828 meant to scan a string and allocate space for it with malloc, is now
1829 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1830 defined. This extension conflicts with C99's use of '%a' to scan a
1831 hexadecimal floating-point number, which is now available to programs
1832 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1834 POSIX.1-2008 includes the feature of allocating a buffer for string input
1835 with malloc, using the modifier letter 'm' instead. Programs using
1836 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1837 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1838 C99 '%a' no longer need to avoid _GNU_SOURCE.
1840 GCC's -Wformat warnings can detect most uses of this extension, as long
1841 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1842 __attribute__ ((format (scanf, ...))).
1844 Changes to build and runtime requirements:
1846 * Python 3.4 or later is required to build the GNU C Library.
1848 * On most architectures, GCC 5 or later is required to build the GNU C
1849 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1851 Older GCC versions and non-GNU compilers are still supported when
1852 compiling programs that use the GNU C Library.
1854 Security related changes:
1856 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1857 denial of service due to resource exhaustion when processing getaddrinfo
1858 calls with crafted host names. Reported by Guido Vranken.
1860 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1861 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1862 happened, accessing the 32-bit size_t value as the full 64-bit register
1863 in the assembly string/memory functions would cause a buffer overflow.
1864 Reported by H.J. Lu.
1866 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1867 addresses with arbitrary trailing characters, potentially leading to data
1868 or command injection issues in applications.
1870 The following bugs are resolved with this release:
1872 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1873 [10496] localedata: 12h time representation in multiple locales faulty
1874 [10797] localedata: it_IT locale numeric does not have a separator for
1876 [11319] libc: dprintf doesn't handle errors properly
1877 [16346] time: mktime: potentially unsafe use of localtime_offset
1878 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1880 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1881 posix_spawn_file_actions_addfchdir_np
1882 [17426] localedata: Indian locales: set the correct date format
1883 [17490] stdio: popen should not invoke atfork handlers
1884 [17783] libc: TIOCSER_TEMT conditions inconsistent
1885 [18040] regex: use-after-free in regexec/get_subexp
1886 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1887 [20018] network: getaddrinfo should reject IP addresses with trailing
1888 characters (CVE-2016-10739)
1889 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1890 [20271] libc: Missing "\n" in __libc_fatal calls
1891 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1892 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1893 pointer argument is non-NULL
1894 [21037] stdio: open_memstream and freopen
1895 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1896 [21716] time: Crash in glibc's mktime in low-memory situations
1897 [22834] stdio: Subprocess forked by popen may crash in Linux when
1898 multithreads call popen
1899 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1900 and pthread_create fails.
1901 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1902 [23125] libc: riscv64: endless loop when throwing an exception from a
1904 [23275] nptl: Race in pthread_mutex_lock while promoting to
1905 PTHREAD_MUTEX_ELISION_NP.
1906 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1908 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1910 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1912 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1913 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1915 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1916 [23521] nss: get_next_alias nss_files file stream leak
1917 [23538] nptl: Hang in pthread_cond_broadcast
1918 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1919 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1920 [23579] libc: Errors misreported in preadv2
1921 [23597] build: support/test-container.c doesn't work with different
1923 [23603] time: mktime signed integer overflow on large timestamps
1924 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1925 [23614] libc: powerpc: missing CFI register information in __mpn_*
1927 [23637] string: Generic strstr/strcasestr fails with huge needles
1928 [23640] libc: no way to easily clear FD_CLOEXEC in
1929 posix_spawn_file_actions_adddup2()
1930 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1932 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1934 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1935 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1936 bits/types/struct_rusage.h
1937 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1939 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1941 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1942 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1943 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1945 [23724] localedata: Albanian date formats are incorrect
1946 [23735] math: libnldbl_nonshared.a references internal libm symbols
1947 [23740] localedata: kl_GL: Month names and date formats need update
1948 [23744] regex: regex refactorings to remove BE, avoid duplication
1949 [23745] time: mktime fix for Gnulib + coreutils
1950 [23758] time: Improve the width of alternate representation for year in
1952 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1953 [23789] time: mktime does not set errno on failure
1954 [23791] localedata: Wrong monetary format for ca_ES locale
1955 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1956 [23794] locale: c16rtomb does not handle surrogate pairs
1957 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1958 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1959 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1960 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1961 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1962 [23862] libc: [sh] missing kernel-features.h undefines
1963 [23864] libc: [riscv] missing kernel-features.h undefines
1964 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1965 [23907] malloc: Incorrect double-free malloc tcache check disregards
1967 [23913] libc: off-by-one in function maybe_script_execute in
1968 sysdeps/posix/spawni.c
1969 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1970 [23923] locale: Add --no-hard-links option to localedef
1971 [23927] network: Linux if_nametoindex() does not close descriptor
1973 [23961] math: powf can overflow to inf without setting errno in non-
1974 nearest rounding mode
1975 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1976 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1977 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1978 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1979 [24011] localedata: Fixed small type in comment for locale bs_BA
1980 [24018] libc: gettext() may return NULL
1981 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1982 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1983 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1985 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1986 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1988 [24046] localedata: en_US locale doesn't define date_fmt
1989 [24063] manual: @var{errno} should be @code{errno}
1990 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1991 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1993 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1995 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1997 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1999 [24112] network: Do not send DNS queries for non-host names (where all
2000 answers will be rejected)
2001 [24130] libc: alpha __remqu corrupts $f3 register
2008 * The localization data for ISO 14651 is updated to match the 2016
2009 Edition 4 release of the standard, this matches data provided by
2010 Unicode 9.0.0. This update introduces significant improvements to the
2011 collation of Unicode characters. This release deviates slightly from
2012 the standard in that the collation element ordering for lowercase and
2013 uppercase LATIN script characters is adjusted to ensure that regular
2014 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2015 is not matched by [a-z]. With the update many locales have been
2016 updated to take advantage of the new collation information. The new
2017 collation information has increased the size of the compiled locale
2018 archive or binary locales.
2020 * The GNU C Library can now be compiled with support for Intel CET, AKA
2021 Intel Control-flow Enforcement Technology. When the library is built
2022 with --enable-cet, the resulting glibc is protected with indirect
2023 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2024 compatible with all existing executables and shared libraries. This
2025 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2026 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2027 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2028 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2029 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2030 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2033 * The GNU C Library now has correct support for ABSOLUTE symbols
2034 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2035 relocated incorrectly or in some cases discarded. The GNU linker can
2036 make use of the newer semantics, but it must communicate it to the
2037 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2038 field) to indicate such support is required.
2040 * Unicode 11.0.0 Support: Character encoding, character type info, and
2041 transliteration tables are all updated to Unicode 11.0.0, using
2042 generator scripts contributed by Mike FABIAN (Red Hat).
2044 * <math.h> functions that round their results to a narrower type are added
2045 from TS 18661-1:2014 and TS 18661-3:2015:
2047 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2048 fMxaddfNx functions.
2050 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2051 fMxsubfNx functions.
2053 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2054 fMxmulfNx functions.
2056 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2057 fMxdivfNx functions.
2059 * Two grammatical forms of month names are now supported for the following
2060 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2061 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2062 support two grammatical forms in abbreviated month names: Catalan, Greek,
2065 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2066 include the support for two grammatical forms of month names.
2068 * Building and running on GNU/Hurd systems now works without out-of-tree
2071 * The renameat2 function has been added, a variant of the renameat function
2072 which has a flags argument. If the flags are zero, the renameat2 function
2073 acts like renameat. If the flag is not zero and there is no kernel
2074 support for renameat2, the function will fail with an errno value of
2075 EINVAL. This is different from the existing gnulib function renameatu,
2076 which performs a plain rename operation in case of a RENAME_NOREPLACE
2077 flags and a non-existing destination (and therefore has a race condition
2078 that can clobber the destination inadvertently).
2080 * The statx function has been added, a variant of the fstatat64
2081 function with an additional flags argument. If there is no direct
2082 kernel support for statx, glibc provides basic stat support based on
2083 the fstatat64 function.
2085 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2086 library if installed. libidn2 version 2.0.5 or later is recommended. If
2087 libidn2 is not available, internationalized domain names are not encoded
2088 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2089 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2090 with an encoding error.) Flags which used to change the IDN encoding and
2091 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2092 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2093 deprecated. They no longer have any effect.
2095 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2096 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2097 range of ELF gABI expressions including such constructs as
2098 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2099 have been further restricted, and where in the past a dynamic string
2100 token sequence may have been interpreted as a literal string it will
2101 now cause a load failure. These load failures were always considered
2102 unspecified behaviour from the perspective of the dynamic loader, and
2103 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2104 results in a load failure now.
2106 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2107 implementation includes all the standard functions provided by
2110 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2111 thrd_detach, thrd_exit, and thrd_join for thread management.
2113 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2114 mtx_destroy for mutual exclusion.
2116 - call_once for function call synchronization.
2118 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2119 cnd_wait for conditional variables.
2121 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2123 Application developers must link against libpthread to use ISO C threads.
2125 Deprecated and removed features, and other changes affecting compatibility:
2127 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2128 installed. Software that was using either header should be updated to
2129 use standard <stdio.h> interfaces instead.
2131 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2132 This was never required by the C standard, and the macros just expanded
2133 to call alternative names for the same functions. If you hoped getc and
2134 putc would provide performance improvements over fgetc and fputc, instead
2135 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2136 necessary, flockfile and funlockfile.
2138 * All stdio functions now treat end-of-file as a sticky condition. If you
2139 read from a file until EOF, and then the file is enlarged by another
2140 process, you must call clearerr or another function with the same effect
2141 (e.g. fseek, rewind) before you can read the additional data. This
2142 corrects a longstanding C99 conformance bug. It is most likely to affect
2143 programs that use stdio to read interactive input from a terminal.
2146 * The macros 'major', 'minor', and 'makedev' are now only available from
2147 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2148 headers that happen to include <sys/types.h>. These macros are rarely
2149 used, not part of POSIX nor XSI, and their names frequently collide with
2150 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2151 further explanation.
2153 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2154 these macros should first include <sys/types.h>, and then include
2155 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2157 * The tilegx*-*-linux-gnu configurations are no longer supported.
2159 * The obsolete function ustat is no longer available to newly linked
2160 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2161 function has been deprecated in favor of fstatfs and statfs.
2163 * The obsolete function nfsservctl is no longer available to newly linked
2164 binaries. This function was specific to systems using the Linux kernel
2165 and could not usefully be used with the GNU C Library on systems with
2166 version 3.1 or later of the Linux kernel.
2168 * The obsolete function name llseek is no longer available to newly linked
2169 binaries. This function was specific to systems using the Linux kernel
2170 and was not declared in a header. Programs should use the lseek64 name
2171 for this function instead.
2173 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2174 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2175 previously selected by them is now always enabled.
2177 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2178 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2179 restriction (rejecting '_' in host names, among other things) has been
2180 removed, for increased compatibility with non-IDN name resolution.
2182 * The fcntl function now have a Long File Support variant named fcntl64. It
2183 is added to fix some Linux Open File Description (OFD) locks usage on non
2184 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2185 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2186 locks act as a cancellation entrypoint.
2188 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2189 ecb_crypt, and des_setparity are no longer available to newly linked
2190 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2191 longer installed. These functions encrypted and decrypted data with the
2192 DES block cipher, which is no longer considered secure. Software that
2193 still uses these functions should switch to a modern cryptography library,
2196 * Reflecting the removal of the encrypt and setkey functions above, the
2197 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2198 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2201 * The obsolete function fcrypt is no longer available to newly linked
2202 binaries. It was just another name for the standard function crypt,
2203 and it has not appeared in any header file in many years.
2205 * We have tentative plans to hand off maintenance of the passphrase-hashing
2206 library, libcrypt, to a separate development project that will, we hope,
2207 keep up better with new passphrase-hashing algorithms. We will continue
2208 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2209 'crypt_r' should not need to change at all; however, distributions will
2210 need to install <crypt.h> and libcrypt from a separate project.
2212 In this release, if the configure option --disable-crypt is used, glibc
2213 will not install <crypt.h> or libcrypt, making room for the separate
2214 project's versions of these files. The plan is to make this the default
2215 behavior in a future release.
2217 Changes to build and runtime requirements:
2219 GNU make 4.0 or later is now required to build glibc.
2221 Security related changes:
2223 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2224 been fixed by removing the glibc-internal IDNA implementation and using
2225 the system-provided libidn2 library instead. Originally reported by Hanno
2226 Böck and Christian Weisgerber.
2228 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2229 architecture could corrupt memory. Reported by Max Horn.
2231 CVE-2018-11236: Very long pathname arguments to realpath function could
2232 result in an integer overflow and buffer overflow. Reported by Alexey
2235 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2236 architecture could write beyond the target buffer, resulting in a buffer
2237 overflow. Reported by Andreas Schwab.
2239 The following bugs are resolved with this release:
2241 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2242 [6889] manual: 'PWD' mentioned but not specified
2243 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2244 when __WORDSIZE != 64
2245 [13762] regex: re_search etc. should return -2 on memory exhaustion
2246 [13888] build: /tmp usage during testing
2247 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2248 [14092] nptl: Support C11 threads
2249 [14095] localedata: Review / update collation data from Unicode / ISO
2251 [14508] libc: -Wformat warnings
2252 [14553] libc: Namespace pollution loff_t in sys/types.h
2253 [14890] libc: Make NT_PRFPREG canonical.
2254 [15105] libc: Extra PLT references with -Os
2255 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2257 [16335] manual: Feature test macro documentation incomplete and out of
2259 [16552] libc: Unify umount implementations in terms of umount2
2260 [17082] libc: htons et al.: statement-expressions prevent use on global
2261 scope with -O1 and higher
2262 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2263 [17438] localedata: pt_BR: wrong d_fmt delimiter
2264 [17662] libc: please implement binding for the new renameat2 syscall
2265 [17721] libc: __restrict defined as /* Ignore */ even in c11
2266 [17979] libc: inconsistency between uchar.h and stdint.h
2267 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2268 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2269 horrible machine code)
2270 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2272 [18471] libc: llseek should be a compat symbol
2273 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2275 [18991] nss: nss_files skips large entry in database
2276 [19239] libc: Including stdlib.h ends up with macros major and minor being
2278 [19463] libc: linknamespace failures when compiled with -Os
2279 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2280 [19527] locale: Normalized charset name not recognized by setlocale
2281 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2282 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2284 [19728] network: out of bounds stack read in libidn function
2285 idna_to_ascii_4i (CVE-2016-6261)
2286 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2287 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2288 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2290 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2291 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2292 [20419] dynamic-link: files with large allocated notes crash in
2294 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2295 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2296 [20980] manual: CFLAGS environment variable replaces vital options
2297 [21163] regex: Assertion failure in pop_fail_stack when executing a
2298 malformed regexp (CVE-2015-8985)
2299 [21234] manual: use of CFLAGS makes glibc detect no optimization
2300 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2301 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2302 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2303 [21508] locale: intl/tst-gettext failure with latest msgfmt
2304 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2305 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2306 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2308 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2310 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2311 [22247] network: Integer overflow in the decode_digit function in
2312 puny_decode.c in libidn (CVE-2017-14062)
2313 [22342] nscd: NSCD not properly caching netgroup
2314 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2315 [22550] localedata: es_ES locale (and other es_* locales): collation
2316 should treat ñ as a primary different character, sync the collation
2317 for Spanish with CLDR
2318 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2319 by gcc configured with --enable-default-pie
2320 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2321 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2322 crossing 2GB threshold (CVE-2017-18269)
2323 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2325 [22735] time: Misleading typo in time.h source comment regarding
2327 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2328 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2329 `__assert_perror_fail ()' to `__assert_fail_base ()'
2330 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2332 [22786] libc: Stack buffer overflow in realpath() if input size is close
2333 to SSIZE_MAX (CVE-2018-11236)
2334 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2335 through an absolute DT_NEEDED path
2336 [22792] build: tcb-offsets.h dependency dropped
2337 [22797] libc: pkey_get() uses non-reserved name of argument
2338 [22807] libc: PTRACE_* constants missing for powerpc
2339 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2340 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2341 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2342 [22848] localedata: ca_ES: update date definitions from CLDR
2343 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2344 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2345 [22896] localedata: Update locale data for an_ES
2346 [22902] math: float128 test failures with GCC 8
2347 [22918] libc: multiple common of `__nss_shadow_database'
2348 [22919] libc: sparc32: backtrace yields infinite backtrace with
2350 [22926] libc: FTBFS on powerpcspe
2351 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2353 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2354 [22947] libc: FAIL: misc/tst-preadvwritev2
2355 [22963] localedata: cs_CZ: Add alternative month names
2356 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2357 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2358 [22998] dynamic-link: execstack tests are disabled when SELinux is
2360 [23005] network: Crash in __res_context_send after memory allocation
2362 [23007] math: strtod cannot handle -nan
2363 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2364 [23036] regex: regex equivalence class regression
2365 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2366 [23069] libc: sigaction broken on riscv64-linux-gnu
2367 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2368 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2369 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2370 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2371 and libc build with -Os)
2372 [23140] localedata: More languages need two forms of month names
2373 [23145] libc: _init/_fini aren't marked as hidden
2374 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2375 [23171] math: C++ iseqsig for long double converts arguments to double
2376 [23178] nscd: sudo will fail when it is run in concurrent with commands
2377 that changes /etc/passwd
2378 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2380 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2381 [23208] localedata: New locale - Lower Sorbian (dsb)
2382 [23233] regex: Memory leak in build_charclass_op function in file
2384 [23236] stdio: Harden function pointers in _IO_str_fields
2385 [23250] nptl: Offset of __private_ss differs from GCC
2386 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2387 -mtune=generic -mfpmath=sse
2388 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2390 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2391 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2393 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2394 [23277] math: nan function should not have const attribute
2395 [23279] math: scanf and strtod wrong for some hex floating-point
2396 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2398 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2399 [23303] build: undefined reference to symbol
2400 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2401 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2403 [23313] stdio: libio vtables validation and standard file object
2405 [23329] libc: The __libc_freeres infrastructure is not properly run across
2407 [23349] libc: Various glibc headers no longer compatible with
2409 [23351] malloc: Remove unused code related to heap dumps and malloc
2411 [23363] stdio: stdio-common/tst-printf.c has non-free license
2412 [23396] regex: Regex equivalence regression in single-byte locales
2413 [23422] localedata: oc_FR: More updates of locale data
2414 [23442] build: New warning with GCC 8
2415 [23448] libc: Out of bounds access in IBM-1390 converter
2416 [23456] libc: Wrong index_cpu_LZCNT
2417 [23458] build: tst-get-cpu-features-static isn't added to tests
2418 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2420 [23467] dynamic-link: x86/CET: A property note parser bug
2427 * The GNU C Library can now be compiled with support for building static
2428 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2429 executables are like static executables but can be loaded at any address
2430 and provide additional security hardening benefits at the cost of some
2431 memory and performance. When the library is built with --enable-static-pie
2432 the resulting libc.a is usable with GCC 8 and above to create static PIE
2433 executables using the GCC option '-static-pie'. This feature is currently
2434 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2435 aarch64 with binutils 2.30 or later.
2437 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2438 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2441 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2443 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2445 * In order to support faster and safer process termination the malloc API
2446 family of functions will no longer print a failure address and stack
2447 backtrace after detecting heap corruption. The goal is to minimize the
2448 amount of work done after corruption is detected and to avoid potential
2449 security issues in continued process execution. Reducing shutdown time
2450 leads to lower overall process restart latency, so there is benefit both
2451 from a security and performance perspective.
2453 * The abort function terminates the process immediately, without flushing
2454 stdio streams. Previous glibc versions used to flush streams, resulting
2455 in deadlocks and further data corruption. This change also affects
2456 process aborts as the result of assertion failures.
2458 * On platforms where long double has the IEEE binary128 format (aarch64,
2459 alpha, mips64, riscv, s390 and sparc), the math library now implements
2460 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2461 These are the same interfaces added in version 2.26 for some platforms where
2462 this format is supported but is not the format of long double.
2464 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2465 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2466 implements interfaces for that type, as defined by ISO/IEC TS
2467 18661-3:2015. These are corresponding interfaces to those supported for
2470 * The math library now implements interfaces for the _Float32, _Float64 and
2471 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2472 corresponding interfaces to those supported for _Float128.
2474 * glibc now implements the memfd_create and mlock2 functions on Linux.
2476 * Support for memory protection keys was added. The <sys/mman.h> header now
2477 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2480 * The copy_file_range function was added.
2482 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2484 * The ldconfig utility now processes `include' directives using the C/POSIX
2485 collation ordering. Previous glibc versions used locale-specific
2486 ordering, the change might break systems that relied on that.
2488 * Support for two grammatical forms of month names has been added.
2489 In a call to strftime, the "%B" and "%b" format specifiers will now
2490 produce the grammatical form required when the month is used as part
2491 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2492 required when the month is named by itself. For instance, in Greek
2493 and in many Slavic and Baltic languages, "%B" will produce the month
2494 in genitive case, and "%OB" will produce the month in nominative case.
2496 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2497 are all valid and will all accept any known form of month
2498 name---standalone or complete, abbreviated or full. In a call to
2499 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2500 the strings used by "%B" and "%b", respectively. New query
2501 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2502 used by "%OB" and "%Ob", respectively.
2504 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2505 define the strings for %OB and %Ob, respectively; these have the
2506 same syntax as "mon" and "abmon". These arrays are optional; if they
2507 are not provided then they have the same content as "mon" and "abmon",
2510 These features are provided for locales which define "alt_mon" and/or
2511 "ab_alt_mon" in their locale source data. This release includes such
2512 alternative month name data for the following languages: Belarusian,
2513 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2515 This feature is currently a GNU extension, but it is expected to
2516 be added to the next revision of POSIX, and it is also already
2517 available on some BSD-derived operating systems.
2519 This feature will cause existing statically compiled applications
2520 to fail to load locales and fall back to the builtin C/POSIX locales.
2521 See notes below for other changes affecting compatibility.
2523 * Support for the RISC-V ISA running on Linux has been added. This port
2524 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2525 for the following ISA and ABI pairs:
2531 Deprecated and removed features, and other changes affecting compatibility:
2533 * Statically compiled applications attempting to load locales compiled for the
2534 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2535 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2536 support for two grammatical forms of the month names, also extends the locale
2537 data binary format. Static applications needing locale support must be
2538 recompiled to match the runtime and data they are deployed with. In some
2539 distributions there is an upgrade window where dynamically linked applications
2540 may use a new library but the old locale data and also fall back to the
2541 builtin C/POSIX locales; restarting the application process is sufficient to
2544 * Support for statically linked applications which call dlopen is deprecated
2545 and will be removed in a future version of glibc. Applications which call
2546 dlopen need to be linked dynamically instead.
2548 * Support for old programs which use internal stdio data structures and
2549 functions is deprecated. This includes programs which use the C++ streams
2550 provided by libstdc++ in GCC 2.95. Programs which use the internal
2551 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2552 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2553 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2554 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2555 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2556 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2557 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2558 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2559 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2560 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2561 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2562 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2563 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2564 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2565 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2566 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2567 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2568 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2569 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2570 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2571 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2572 future version of glibc. Unlike other symbol removals, these old
2573 applications will not be supported using compatibility symbols.
2575 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2576 defined by <sys/ptrace.h>.
2578 * libm no longer supports SVID error handling (calling a user-provided
2579 matherr function on error) or the _LIB_VERSION variable to control error
2580 handling. (SVID error handling and the _LIB_VERSION variable still work
2581 for binaries linked against older versions of the GNU C Library.) The
2582 libieee.a library is no longer provided. math.h no longer defines struct
2583 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2584 TLOSS, PLOSS and HUGE.
2586 * The libm functions pow10, pow10f and pow10l are no longer supported for
2587 new programs. Programs should use the standard names exp10, exp10f and
2588 exp10l for these functions instead.
2590 * The mcontext_t type is no longer the same as struct sigcontext. On
2591 platforms where it was previously the same, this changes the C++ name
2592 mangling for interfaces involving this type.
2594 * The add-ons mechanism for building additional packages at the same time as
2595 glibc has been removed. The --enable-add-ons configure option is now
2598 * The --without-fp configure option is now ignored. Whether hardware
2599 floating-point instructions are used is now configured based on whether
2600 the compiler used at configure time (without any options implied by a
2601 --with-cpu= configure option) uses such instructions.
2603 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2604 the specified string can be parsed as a domain name.
2606 * In the malloc_info output, the <heap> element may contain another <aspace>
2607 element, "subheaps", which contains the number of sub-heaps.
2609 * The libresolv function p_secstodate is no longer supported for new
2612 * The tilepro-*-linux-gnu configuration is no longer supported.
2614 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2615 and will be removed in a future release. Software that is still using
2616 either header should be updated to use standard <stdio.h> interfaces
2619 libio.h was originally the header for a set of supported GNU extensions,
2620 but they have not been maintained as such in many years, they are now
2621 standing in the way of improvements to stdio, and we don't think there are
2622 any remaining external users. _G_config.h was never intended for public
2623 use, but predates the bits convention.
2625 Changes to build and runtime requirements:
2627 * bison version 2.7 or later is required to generate code in the 'intl'
2630 Security related changes:
2632 CVE-2009-5064: The ldd script would sometimes run the program under
2633 examination directly, without preventing code execution through the
2634 dynamic linker. (The glibc project disputes that this is a security
2635 vulnerability; only trusted binaries must be examined using the ldd
2638 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2639 suffered from a one-byte overflow during ~ operator processing (either
2640 on the stack or the heap, depending on the length of the user name).
2641 Reported by Tim Rühsen.
2643 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2644 would sometimes fail to free memory allocated during ~ operator
2645 processing, leading to a memory leak and, potentially, to a denial
2648 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2649 without GLOB_NOESCAPE, could write past the end of a buffer while
2650 unescaping user names. Reported by Tim Rühsen.
2652 CVE-2017-17426: The malloc function, when called with an object size near
2653 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2654 instead of NULL. This was a regression introduced with the new malloc
2655 thread cache in glibc 2.26. Reported by Iain Buclaw.
2657 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2658 to the allocation of too much memory. (This is not a security bug per se,
2659 it is mentioned here only because of the CVE assignment.) Reported by
2662 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2663 of the number of search path components. (This is not a security
2664 vulnerability per se because no trust boundary is crossed if the fix for
2665 CVE-2017-1000366 has been applied, but it is mentioned here only because
2666 of the CVE assignment.) Reported by Qualys.
2668 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2669 for AT_SECURE or SUID binaries could be used to load libraries from the
2672 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2673 succeeds without returning an absolute path due to unexpected behaviour
2674 of the Linux kernel getcwd syscall. Reported by halfdog.
2676 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2677 an object size near the value of SIZE_MAX, would return a pointer to a
2678 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2680 CVE-2018-6551: The malloc function, when called with an object size near
2681 the value of SIZE_MAX, would return a pointer to a buffer which is too
2682 small, instead of NULL.
2684 The following bugs are resolved with this release:
2686 [866] glob: glob should match dangling symlinks
2687 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2688 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2690 [5997] math: Very slow execution of sinf function
2691 [10580] localedata: hr_HR: updated locale
2692 [10871] locale: 'mon' array should contain both nominative and genitive
2694 [12349] localedata: eu_ES: incorrect thousands separator
2695 [13605] localedata: shn_MM: new Shan locale
2696 [13805] localedata: ru_RU: currency should use ',' as radix point
2697 [13953] localedata: km_KH: locale update
2698 [13994] localedata: mjw_IN: new locale
2699 [14121] build: make writes .mo files in po directory
2700 [14333] libc: Fix the race between atexit() and exit()
2701 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2702 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2704 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2705 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2706 width Latin characters
2707 [15332] localedata: es_CU: locale update
2708 [15436] stdio: Don't close or flush stdio streams on abort
2709 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2711 [16148] localedata: ca_ES: incorrect thousands separator
2712 [16750] dynamic-link: ldd should not try to execute the binaries
2714 [16777] localedata: pl_PL: incorrect thousands separator in locale
2715 [16905] localedata: hanzi: new collation
2716 [17563] localedata: cmn_TW: add hanzi collation
2717 [17750] localedata: wrong collation order of diacritics in most locales
2718 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2720 [17956] build: Build fails on missing definitions from header file
2721 nss/nss.h when Mozilla NSS is used for cryptography
2722 [18203] libc: realpath() does not handle unreachable paths correctly
2723 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2724 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2725 [18822] libc: Internal functions are called via PLT
2726 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2727 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2728 [19574] libc: glibc should support building static PIE binaries
2729 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2731 [19971] glob: glob: Do not skip entries with zero d_ino values
2732 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2733 [20008] localedata: km_KH: convert to translit_neutral
2734 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2735 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2736 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2737 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2738 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2740 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2741 they're set, wrong errors returned by gaih_inet when lookup functions
2743 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2744 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2746 [20952] localedata: yuw_PG: new locale
2747 [21084] localedata: charmaps/IBM858: new codepage
2748 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2749 [21242] libc: assert gives pedantic warning in old gcc versions
2750 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2751 __regcall calling convention
2752 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2753 [21326] libc: C99 functions are not declared for C++11 and later if
2754 _GNU_SOURCE is not predefined by g++
2755 [21457] libc: sys/ucontext.h namespace
2756 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2757 [21660] math: GCC fails to compile a formula with tgmath.h
2758 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2759 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2760 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2761 [21684] math: tgmath.h handling of complex integers
2762 [21685] math: tgmath.h handling of bit-fields
2763 [21686] math: tgmath.h handling of __int128
2764 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2766 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2768 [21750] localedata: column width of characters incompatible with classical
2770 [21754] malloc: malloc: Perform as little work as possible after heap
2771 consistency check failures
2772 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2773 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2774 [21791] string: Unused XXX_chk_XXX functions in libc.a
2775 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2777 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2779 [21845] localedata: Added new Locale bho_NP
2780 [21853] localedata: Fix abday Which looks same as day in zh_SG
2781 [21854] localedata: Added New Locale en_SC
2782 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2783 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2784 _dl_runtime_resolve_avx_slow
2785 [21885] network: getaddrinfo: gethosts does not release resolver context
2786 on memory allocation failure
2787 [21899] libc: XPG4.2 sigaction namespace
2788 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2790 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2792 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2793 errno value, causing getaddrinfo to fail
2794 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2795 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2796 instead of EAI_NODATA
2797 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2798 constant PTRACE_SEIZE_DEVEL
2799 [21930] math: C-only gcc builtins used in <math.h> isinf
2800 [21932] network: Unpaired __resolv_context_get in generic get*_r
2802 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2803 [21944] libc: sigval namespace
2804 [21951] localedata: Update hanzi collation by stroke
2805 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2806 sysdeps/x86_64/fpu/e_expf.S
2807 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2808 allocation in syscall loops)
2809 [21959] localedata: Fix Country name for xh_ZA
2810 [21960] localedata: Fix abmon for bem_ZM
2811 [21966] math: AVX2 mathvec functions use FMA without checking
2812 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2813 [21971] localedata: Added New Locale for mfe_MU
2814 [21972] libc: assert macro requires operator== (int) for its argument type
2815 [21973] math: [sparc] libm missing sqrtl compat symbol
2816 [21974] libc: Remove __bb_init_func and __bb_exit_func
2817 [21982] string: stratcliff.c: error: assuming signed overflow does not
2819 [21986] stdio: __guess_grouping is called incorrectly
2820 [21987] math: [sparc32] wrong bits/long-double.h installed
2821 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2823 [22022] localedata: Missing country_name for mni_IN
2824 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2826 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2828 [22026] locale: iconv_open: heap overflow on gconv_init failure
2829 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2830 [22035] math: [m68k] bits/math-inline.h macro namespace
2831 [22038] localedata: Fix abbreviated weeks and months for Somali
2832 [22044] localedata: Remove redundant data for Limburgish Language
2833 [22050] malloc: Linking with -lmcheck does not hook
2834 __malloc_initialize_hook correctly
2835 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2836 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2837 [22070] localedata: charmaps/UTF-8: wcwidth for
2838 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2839 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2840 Jungseong and Jongseong) should be 0
2841 [22078] nss: nss_files performance issue in multi mode
2842 [22082] math: bits/math-finite.h exp10 condition
2843 [22086] libc: pcprofiledump incorrect cross-endian condition
2844 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2845 [22095] network: Name server address allocation memory leak in resolv.conf
2847 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2849 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2850 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2852 [22111] malloc: malloc: per thread cache is not returned when thread exits
2853 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2854 [22134] libc: [linux] implement fexecve with execveat
2855 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2857 [22145] libc: ttyname() gives up too early in the face of namespaces
2858 [22146] math: C++ build issue with float128 on x86_64
2859 [22153] nptl: nptl: save error code before process termination
2860 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2861 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2862 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2863 [22165] libc: [hppa] Text relocations in libc.so
2864 [22180] libc: destructor registered via __cxa_atexit is called twice
2865 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2866 symlinks") cause "make" segfaults
2867 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2869 [22207] libc: FAIL: stdlib/test-atexit-race
2870 [22225] math: nearbyint arithmetic moved before feholdexcept
2871 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2872 [22235] math: iscanonical in C++ and float128
2873 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2874 the svid compat wrapper
2875 [22244] math: ynf and yn are wrong without the svid compat wrapper
2876 [22273] libc: Improper assert in Linux posix_spawn implementation
2877 [22284] libc: -pg -pie doesn't work
2878 [22292] locale: localedef exits with error 4 when it should be error 1
2879 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2880 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2882 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2883 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2885 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2886 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2887 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2888 [22322] libc: [mips64] wrong bits/long-double.h installed
2889 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2890 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2892 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2893 [22343] malloc: Integer overflow in posix_memalign
2894 [22347] libc: getrandom() returns the number of bytes that were copied to
2895 the buffer even though the comments say "Return 0 on success and -1 on
2897 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2898 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2900 [22370] dynamic-link: Incorrect note padding check
2901 [22375] libc: malloc returns pointer from tcache_get when should return
2902 NULL (CVE-2017-17426)
2903 [22377] math: iseqsig, float128 and C++
2904 [22382] localedata: Error in tpi_PG locale
2905 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2906 inside the ASCII printable range
2907 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2909 [22403] localedata: Slash needs escaping in some locales
2910 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2911 [22409] network: res_hnok does not accept some host names used on the
2913 [22412] network: res_dnok, res_hnok should perform syntax checks
2914 [22413] network: ns_name_pton ignores syntactically invalid trailing
2916 [22415] stdio: setvbuf can lead to invalid free/segfault
2917 [22432] build: Non-deterministic build
2918 [22439] malloc: malloc_info should compute summary statistics for all sub-
2920 [22442] network: if_nametoindex could report index for the wrong
2921 networking interface
2922 [22446] build: aliasing violation calling readlink in handle_request
2923 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2924 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2925 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2926 __nscd_hash/__nss_hash
2927 [22463] network: p_secstodate overflow handling
2928 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2929 [22478] libc: sigwait can fail with EINTR
2930 [22505] libc: ldconfig processes include directive in locale-specific
2932 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2933 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2934 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2935 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2936 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2937 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2938 same as for Croatian
2939 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2940 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2941 [22577] libc: missing newline after "cannot allocate TLS data structures
2943 [22588] manual: manual/conf.texi: missing underscore in front of
2945 [22593] math: nextafter and nexttoward are declared with const attribute
2946 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2947 [22603] string: ia64 memchr overflows internal pointer check
2948 [22605] libc: SH clone does not set the exit code correctly
2949 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2951 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2952 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2953 modified in case of success
2954 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2955 [22615] manual: manual: ambiguous wording about errno value in case of
2957 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2959 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2960 binaries or if /proc is not mounted (CVE-2017-16997)
2961 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2962 [22630] build: $(no-pie-ldflag) is no longer effective
2963 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2964 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2965 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2966 [22637] nptl: guard size is subtracted from thread stack size instead of
2968 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2969 [22657] localedata: hu_HU: Avoid double space in date
2970 [22660] math: fmax, fmin sNaN handling on alpha
2971 [22664] libc: New warning of GCC8
2972 [22665] math: alpha: ceil and floor raise inexact exceptions
2973 [22666] math: alpha: trunc raise inexact exceptions
2974 [22667] libc: makecontext lacks stack alignment on i386
2975 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2976 [22679] libc: getcwd(3) can succeed without returning an absolute path
2978 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2979 elision and tunables
2980 [22687] math: [powerpc-nofpu] complex long double functions spurious
2982 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2983 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2984 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2986 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2987 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2989 [22701] nis: Incomplete removal of libnsl
2990 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2991 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2992 [22715] dynamic-link: FAIL: elf/tst-audit10
2993 [22719] libc: Backtrace tests fail on hppa
2994 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2995 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2996 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2997 before the first call to crypt_r () in crypt/badsalttest.c
3004 * A per-thread cache has been added to malloc. Access to the cache requires
3005 no locks and therefore significantly accelerates the fast path to allocate
3006 and free small amounts of memory. Refilling an empty cache requires locking
3007 the underlying arena. Performance measurements show significant gains in a
3008 wide variety of user workloads. Workloads were captured using a special
3009 instrumented malloc and analyzed with a malloc simulator. Contributed by
3010 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3012 * Unicode 10.0.0 Support: Character encoding, character type info, and
3013 transliteration tables are all updated to Unicode 10.0.0, using
3014 generator scripts contributed by Mike FABIAN (Red Hat).
3015 These updates cause user visible changes, especially the changes in
3016 wcwidth for many emoji characters cause problems when emoji sequences
3017 are rendered with pango, see for example:
3018 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3020 * Collation of Hungarian has been overhauled and is now consistent with "The
3021 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3024 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3026 - The GNU C Library will now detect when /etc/resolv.conf has been
3027 modified and reload the changed configuration. The new resolver option
3028 “no-reload” (RES_NORELOAD) disables this behavior.
3030 - The GNU C Library now supports an arbitrary number of search domains
3031 (configured using the “search” directive in /etc/resolv.conf);
3032 previously, there was a hard limit of six domains. For backward
3033 compatibility, applications that directly modify the ‘_res’ global
3034 object are still limited to six search domains.
3036 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3037 Library will now randomly pick a name server from the configuration as a
3038 starting point. (Previously, the second name server was always used.)
3040 * The tunables feature is now enabled by default. This allows users to tweak
3041 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3043 * New function reallocarray, which resizes an allocated block (like realloc)
3044 to the product of two sizes, with a guaranteed clean failure upon integer
3045 overflow in the multiplication. Originally from OpenBSD, contributed by
3046 Dennis Wölfing and Rüdiger Sonderfeld.
3048 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3049 These are extended versions of preadv and pwritev, respectively, taking an
3050 additional flags argument. The set of supported flags depends on the
3051 running kernel; full support currently requires kernel 4.7 or later.
3053 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3054 create a new session ID for the spawned process. This feature is
3055 scheduled to be added to the next major revision of POSIX; for the time
3056 being, it is available under _GNU_SOURCE.
3058 * errno.h is now safe to use from C-preprocessed assembly language on all
3059 supported operating systems. In this context, it will only define the
3060 Exxxx constants, as preprocessor macros expanding to integer literals.
3062 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3063 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3064 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3065 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3067 To compile programs that use this feature, the compiler must support
3068 128-bit floating point with the type name _Float128 (as defined by TS
3069 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3070 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3071 must be defined to make the new interfaces visible.
3073 The new functions and macros correspond to those present for other
3074 floating-point types (except for a few obsolescent interfaces not
3075 supported for the new type), with F128 or f128 suffixes; for example,
3076 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3077 printf or scanf formats for the new type; the strfromf128 and strtof128
3078 interfaces should be used instead.
3080 Deprecated and removed features, and other changes affecting compatibility:
3082 * The synchronization that pthread_spin_unlock performs has been changed to
3083 now be equivalent to a C11 atomic store with release memory order to the
3084 spin lock's memory location. Previously, several (but not all)
3085 architectures used stronger synchronization (e.g., containing what is
3086 often called a full barrier). This change can improve performance, but
3087 may affect odd fringe uses of spin locks that depend on the previous
3088 behavior (e.g., using spin locks as atomic variables to try to implement
3089 Dekker's mutual exclusion algorithm).
3091 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3094 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3095 will only be built and installed when the GNU C Library is configured with
3096 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3097 as TIRPC or rpcsvc-proto, to be used.
3099 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3100 libnss_compat, are deprecated, and will not be built or installed by
3103 The NIS(+) support library, libnsl, is also deprecated. By default, a
3104 compatibility shared library will be built and installed, but not headers
3105 or development libraries. Only a few NIS-related programs require this
3106 library. (In particular, the GNU C Library has never required programs
3107 that use 'gethostbyname' to be linked with libnsl.)
3109 Replacement implementations based on TIRPC, which additionally support
3110 IPv6, are available from <https://github.com/thkukuk/>. The configure
3111 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3112 name service modules, to be built and installed.
3114 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3115 support is enabled, the configured recursive resolver must support EDNS.
3116 (Responding to EDNS-enabled queries with responses which are not
3117 EDNS-enabled is fine, but FORMERR responses are not.)
3119 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3120 servers have not supported this opcode for a long time.
3122 * The _res_opcodes variable has been removed from libresolv. It had been
3123 exported by accident.
3125 * <string.h> no longer includes inline versions of any string functions,
3126 as this kind of optimization is better done by the compiler. The macros
3127 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3129 * The nonstandard header <xlocale.h> has been removed. Most programs should
3130 use <locale.h> instead. If you have a specific need for the definition of
3131 locale_t with no other declarations, please contact
3132 libc-alpha@sourceware.org and explain.
3134 * The obsolete header <sys/ultrasound.h> has been removed.
3136 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3138 * The obsolete function cfree has been removed. Applications should use
3141 * The stack_t type no longer has the name struct sigaltstack. This changes
3142 the C++ name mangling for interfaces involving this type.
3144 * The ucontext_t type no longer has the name struct ucontext. This changes
3145 the C++ name mangling for interfaces involving this type.
3147 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3148 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3149 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3150 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3151 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3152 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3153 fpregset_t type no longer has the name struct fpu. This changes the C++
3154 name mangling for interfaces involving those types.
3156 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3157 synced with the kernel:
3159 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3160 are not supported on this architecture and have been removed.
3162 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3163 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3164 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3166 Programs that assume the GET/SETREGS ptrace requests are universally
3167 available will now fail to build, instead of malfunctioning at runtime.
3169 Changes to build and runtime requirements:
3171 * Linux kernel 3.2 or later is required at runtime, on all architectures
3172 supported by that kernel. (This is a change from version 2.25 only for
3175 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3177 * On most architectures, GCC 4.9 or later is required to build the GNU C
3178 Library. On powerpc64le, GCC 6.2 or later is required.
3180 Older GCC versions and non-GNU compilers are still supported when
3181 compiling programs that use the GNU C Library. (We do not know exactly
3182 how old, and some GNU extensions to C may be _de facto_ required. If you
3183 are interested in helping us make this statement less vague, please
3184 contact libc-alpha@sourceware.org.)
3186 Security related changes:
3188 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3189 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3191 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3192 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3194 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3195 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3198 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3199 fixed (CVE-2017-12133).
3201 The following bugs are resolved with this release:
3203 [984] network: Respond to changed resolv.conf in gethostbyname
3204 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3205 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3207 [12189] libc: __stack_chk_fail should not attempt a backtrace
3209 [14096] time: Race condition on timezone/tst-timezone.out
3210 [14172] localedata: az_IR: new locale
3211 [14995] build: glibc fails to build if gold is the default linker, even if
3213 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3214 [16637] network: inet_pton function is accepting IPv6 with bad format
3215 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3216 x86 and other generic code
3217 [16875] localedata: ko_KR: fix lang_name
3218 [17225] localedata: ar_SY: localized month names for May and June are
3220 [17297] localedata: da_DK: wrong date_fmt string
3221 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3222 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3223 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3224 [19066] localedata: ar_SA abbreviated day and month names are in English
3225 [19569] network: resolv: Support an arbitrary number of search domains
3226 [19570] network: Implement random DNS server selection in the stub
3228 [19838] locale: localedef fails on PA-RISC
3229 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3230 order of 0D36 and 0D37
3231 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3233 [20098] libc: FAIL: debug/backtrace-tst on hppa
3234 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3236 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3238 [20313] localedata: Update locale data to Unicode 9.0
3239 [20424] manual: Document how to provide a malloc replacement
3240 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3242 [20686] locale: Add el_GR@euro to SUPPORTED.
3243 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3244 failures consistently
3245 [21015] dynamic-link: Document and fix --enable-bind-now
3246 [21016] nptl: pthread_cond support is broken on hppa
3247 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3248 frame-pointer on i386
3249 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3251 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3252 [21088] libc: Build fails with --enable-static-nss
3253 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3254 generic c code is used
3255 [21109] libc: Tunables broken on big-endian
3256 [21112] math: powf has large ulp errors with base close to 1 and exponent
3258 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3260 [21120] malloc: glibc malloc is incompatible with GCC 7
3261 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3263 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3264 (-0.0) when linking with -lieee
3265 [21171] math: log10, log2 and lgamma return incorrect results
3266 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3267 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3268 [21207] localedata: ce_RU: update weekdays from CLDR
3269 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3270 [21217] localedata: Update months from CLDR-31
3271 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3272 [21243] libc: support_delete_temp_file should issue warning for failed
3274 [21244] libc: support resolv_test_start() socket fd close should be
3276 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3277 new posix_spawn implementation
3278 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3279 leads to lower CPU frequency
3280 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3281 [21261] libc: [sparc64] bits/setjmp.h namespace
3282 [21267] network: [mips] bits/socket.h IOC* namespace
3283 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3284 [21270] libc: mmap64 silently truncates large offset values
3285 [21275] libc: posix_spawn always crashes on ia64 now
3286 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3287 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3288 [21289] libc: Incorrect declaration for 32-bit platforms with
3289 _FILE_OFFSET_BITS=64 causes build error
3290 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3291 not support gethostbyname4_r
3292 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3294 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3296 [21340] libc: Support POSIX_SPAWN_SETSID
3297 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3298 [21359] network: ns_name_pack needs additional byte in destination buffer
3299 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3300 against fragmentation attacks (CVE-2017-12132)
3301 [21369] network: resolv: Remove EDNS fallback
3302 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3304 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3305 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3306 [21393] stdio: Missing dup3 error check in freopen, freopen64
3307 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3308 [21399] localedata: Bad description for U00EC in
3309 localedata/charmaps/CP1254
3310 [21411] malloc: realloc documentation error
3311 [21426] network: sys/socket.h uio.h namespace
3312 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3313 [21445] libc: signal.h bsd_signal namespace
3314 [21455] network: Network headers stdint.h namespace
3315 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3317 [21475] network: resolv: Overlong search path is truncated mid-label
3318 [21511] libc: sigstack namespace
3319 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3320 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3321 bits/syscall.h: No such file or directory
3322 [21517] libc: struct sigaltstack namespace
3323 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3324 [21533] localedata: Update locale data to Unicode 10.0
3326 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3327 junk at end of line, first unrecognized character is `@'
3328 [21538] libc: SIG_HOLD missing for XPG4
3329 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3330 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3331 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3332 [21543] libc: sigevent namespace
3333 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3334 size for general purpose registers in mcontext_t structure
3335 [21550] libc: sigwait namespace
3336 [21552] libc: XPG4 bsd_signal namespace
3337 [21554] libc: sigpause namespace
3338 [21560] libc: sys/wait.h signal.h namespace
3339 [21561] libc: waitid namespace
3340 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3341 '/usr/include/stdlib.h': Permission denied
3342 [21575] libc: sys/wait.h missing struct rusage definition
3343 [21584] libc: sigaltstack etc namespace
3344 [21597] libc: siginterrupt namespace
3345 [21607] math: hppa: FAIL: math/test-tgmath
3346 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3348 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3349 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3350 stack and heap (CVE-2017-1000366)
3351 [21625] libc: wait3 namespace
3352 [21654] nss: Incorrect pointer alignment in NSS group merge result
3354 [21657] network: Parse interface zone id for node-local multicast
3355 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3357 [21666] libc: .symver is used on common symbol
3358 [21668] network: resolv: res_init cross-thread broadcast introduces race
3360 [21687] math: tgmath.h totalorder, totalordermag return type
3361 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3363 [21696] libc: Incorrect assumption of of __cpu_mask in
3364 posix/sched_cpucount.c
3365 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3366 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3368 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3369 leading to relocation crash
3370 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3371 `resolv_conf_matches (resp, conf)' failed.
3372 [21710] localedata: Added Samoan language locale for Samoa
3373 [21711] localedata: Pashto yesstr/nostr locale are missing
3374 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3375 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3376 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3377 [21723] localedata: yesstr/nostr missing for Chinese language locale
3378 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3380 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3382 [21728] localedata: New Locale for Tongan language
3383 [21729] localedata: incorrect LC_NAME fields for hi_IN
3384 [21733] localedata: yesstr and nostr are missing for zh_HK
3385 [21734] localedata: Missing yesstr and nostr are for kw_GB
3386 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3387 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3388 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3389 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3391 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3393 [21749] localedata: Wrong abbreviated day name (“abday”) for
3395 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3396 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3397 [21759] localedata: missing yesstr and nostr for Tigrinya
3398 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3399 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3400 [21767] localedata: Missing Bislama locales
3401 [21768] localedata: Missing yesstr and nostr for aa_ET
3402 [21770] localedata: Missing Field in li_NL
3403 [21778] nptl: Robust mutex may deadlock
3404 [21779] libc: MicroBlaze segfaults when loading libpthread
3405 [21783] localedata: Fix int_select international_call_prefixes
3406 [21784] localedata: Inconsistency in country_isbn
3407 [21788] localedata: Missing Country Postal Abbreviations
3408 [21794] localedata: Added-country_isbn-for-Italy
3409 [21795] localedata: Add/Fix country_isbn for France
3410 [21796] localedata: Added country_isbn for Republic of Korea
3411 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3412 [21799] localedata: Added int_select international_call_prefixes
3413 [21801] localedata: Added int_select international_call_prefixes
3414 [21804] nptl: Double semicolon in thread-shared-types.h
3415 [21807] localedata: LC_ADDRESS fix for pap_CW
3416 [21808] localedata: Fix LC_ADDRESS for pap_AW
3417 [21821] localedata: Added country_name in mai_IN
3418 [21822] localedata: Fix LC_TIME for mai_IN
3419 [21823] localedata: missing yesstr, nostr for sa_IN
3420 [21825] localedata: Fix name_mrs for mag_IN
3421 [21828] localedata: 2.26 changelog should mention user visible changes
3423 [21835] localedata: Added Maithili language locale for Nepal
3424 [21838] localedata: Removed redundant data for the_NP
3425 [21839] localedata: Fix LC_MONETARY for ta_LK
3426 [21844] localedata: Fix Latin characters and Months Sequence.
3427 [21848] localedata: Fix mai_NP Title Name
3432 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3433 24731-2:2010, is supported to enable declarations of functions from that
3434 TR. Note that not all functions from that TR are supported by the GNU C
3437 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3438 18661-1:2014, is supported to enable declarations of functions and macros
3439 from that TS. Note that not all features from that TS are supported by
3442 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3443 18661-4:2015, is supported to enable declarations of functions and macros
3444 from that TS. Note that most features from that TS are not supported by
3447 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3448 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3449 Since the GNU C Library defaults to a much newer revision of POSIX, this
3450 will only affect programs that specifically request an old conformance
3451 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3452 see a change in the visible declarations, but a program compiled with
3453 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3456 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3457 defined by all multithreaded code, but glibc has not required this for
3460 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3461 means that in a future release, the macros “major”, “minor”, and “makedev”
3462 will only be available from <sys/sysmacros.h>.
3464 These macros are not part of POSIX nor XSI, and their names frequently
3465 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3466 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3467 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3470 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3471 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3472 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3474 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3475 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3476 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3477 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3478 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3479 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3480 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3481 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3482 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3483 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3484 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3487 * New <math.h> features are added from TS 18661-1:2014:
3489 - Signaling NaN macros: SNANF, SNAN, SNANL.
3491 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3492 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3493 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3495 - llogb functions: the llogb, llogbf and llogbl functions, and the
3496 FP_LLOGB0 and FP_LLOGBNAN macros.
3498 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3501 - Comparison macros: iseqsig.
3503 - Classification macros: iscanonical, issubnormal, iszero.
3505 - Total order functions: totalorder, totalorderf, totalorderl,
3506 totalordermag, totalordermagf, totalordermagl.
3508 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3510 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3511 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3513 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3514 are added to libc. They convert a floating-point number into string.
3516 * Most of glibc can now be built with the stack smashing protector enabled.
3517 It is recommended to build glibc with --enable-stack-protector=strong.
3518 Implemented by Nick Alcock (Oracle).
3520 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3521 intended to be used instead of memset() to erase sensitive data after use;
3522 the compiler will not optimize out calls to explicit_bzero even if they
3523 are "unnecessary" (in the sense that no _correct_ program can observe the
3524 effects of the memory clear).
3526 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3527 to float instead of double. This does not affect the ABI of any libraries
3528 that are part of the GNU C Library, but may affect the ABI of other
3529 libraries that use this type in their interfaces.
3531 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3532 float_t and double_t types are now defined to long double instead of float
3533 and double. These options are not the default, and this does not affect
3534 the ABI of any libraries that are part of the GNU C Library, but it may
3535 affect the ABI of other libraries that use this type in their interfaces,
3536 if they are compiled or used with those options.
3538 * The getentropy and getrandom functions, and the <sys/random.h> header file
3541 * The buffer size for byte-oriented stdio streams is now limited to 8192
3542 bytes by default. Previously, on Linux, the default buffer size on most
3543 file systems was 4096 bytes (and thus remains unchanged), except on
3544 network file systems, where the buffer size was unpredictable and could be
3545 as large as several megabytes.
3547 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3548 for the Linux quota interface which predates kernel version 2.4.22 has
3551 * The malloc_get_state and malloc_set_state functions have been removed.
3552 Already-existing binaries that dynamically link to these functions will
3553 get a hidden implementation in which malloc_get_state is a stub. As far
3554 as we know, these functions are used only by GNU Emacs and this change
3555 will not adversely affect already-built Emacs executables. Any undumped
3556 Emacs executables, which normally exist only during an Emacs build, should
3557 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3559 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3560 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3561 “no-ip6-dotint” had already been the default, and support for the
3562 “ip6-dotint” option was removed from the Internet in 2006.
3564 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3565 flag from <resolv.h> have been removed. The option relied on a
3566 backwards-incompatible DNS extension which was never deployed on the
3569 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3570 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3571 They were already unimplemented.
3573 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3574 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3575 removed again from the IETF name lookup interface specification in RFC
3576 2553. Applications should use getaddrinfo instead.
3578 * DNSSEC-related declarations and definitions have been removed from the
3579 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3580 decode the data part of DNSSEC record types. Previous versions of glibc
3581 only implemented minimal support for the previous version of DNSSEC, which
3582 is incompatible with the currently deployed version.
3584 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3585 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3586 <arpa/nameser.h> header file because the distinction between RR types and
3587 meta-RR types is not officially standardized, subject to revision, and
3588 thus not suitable for encoding in a macro.
3590 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3591 and rhook members of the res_state type in <resolv.h> have been removed.
3592 The glibc stub resolver did not support these hooks, but the header file
3593 did not reflect that.
3595 * For multi-arch support it is recommended to use a GCC which has
3596 been built with support for GNU indirect functions. This ensures
3597 that correct debugging information is generated for functions
3598 selected by IFUNC resolvers. This support can either be enabled by
3599 configuring GCC with '--enable-gnu-indirect-function', or by
3600 enabling it by default by setting 'default_gnu_indirect_function'
3601 variable for a particular architecture in the GCC source file
3604 * GDB pretty printers have been added for mutex and condition variable
3605 structures in POSIX Threads. When installed and loaded in gdb these pretty
3606 printers show various pthread variables in human-readable form when read
3607 using the 'print' or 'display' commands in gdb.
3609 * Tunables feature added to allow tweaking of the runtime for an application
3610 program. This feature can be enabled with the '--enable-tunables' configure
3611 flag. The GNU C Library manual has details on usage and README.tunables has
3612 instructions on adding new tunables to the library.
3614 * A new version of condition variables functions have been implemented in
3615 the NPTL implementation of POSIX Threads to provide stronger ordering
3618 * A new version of pthread_rwlock functions have been implemented to use a more
3619 scalable algorithm primarily through not using a critical section anymore to
3622 Security related changes:
3624 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3625 have been created with makecontext could fail to terminate due to a
3626 missing .cantunwind annotation. This has been observed to lead to a hang
3627 (denial of service) in some Go applications compiled with gccgo. Reported
3628 by Andreas Schwab. (CVE-2016-6323)
3630 * The DNS stub resolver functions would crash due to a NULL pointer
3631 dereference when processing a query with a valid DNS question type which
3632 was used internally in the implementation. The stub resolver now uses a
3633 question type which is outside the range of valid question type values.
3636 The following bugs are resolved with this release:
3638 [4099] stdio: Overly aggressive caching by stream i/o functions.
3639 [7065] build: Support building glibc with -fstack-protector or -fstack-
3641 [9842] localedata: en_CA: incorrect date format
3642 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3643 before it started waiting
3644 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3645 [15765] nptl: sem_open is wrongly a cancellation point
3646 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3647 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3649 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3650 library linked with pthread
3651 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3652 "FIXME: Ingo" issue)
3653 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3654 [17252] libc: getrandom and getentropy syscall
3655 [17730] malloc: thread-local storage is sometimes improperly free()'d
3656 after being __libc_memalign()'d
3657 [18241] stdio: failed fseek on memstream does not set errno and can fail
3659 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3661 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3662 PTHREAD_PRIO_INHERIT mutex on ARM
3663 [18784] network: res_query and related function crash for special record
3664 type queries (CVE-2015-5180)
3665 [19380] math: strtod does not raise "inexact"
3666 [19387] string: Integer overflow in memchr
3667 [19390] string: Integer overflow in strncat
3668 [19398] build: linknamespace tests fail with massively parallel build
3669 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3671 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3672 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3673 [19514] libc: [PATCH] Fix spelling errors in spelling
3674 "implement"/"implementation" in several places
3675 [19582] network: Deprecate RES_USE_INET6
3676 [19673] manual: clog10 docs appear to be erroneous
3677 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3678 causes a segmentation fault
3679 [19826] libc: invalid pointer returned from __tls_get_addr with static
3681 [20016] network: resolv: Remove hooks support from the API
3682 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3684 [20033] math: [x86_64] vectorized math function don't call the __finite
3686 [20116] nptl: use after free in pthread_create
3687 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3688 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3690 [20311] nptl: please install proc_service.h
3691 [20366] libc: Compilation errors in installed headers in strict-compliance
3693 [20370] malloc: malloc: Arena free list management is still racy
3694 (incorrect fix in bug 19243)
3695 [20386] libc: assert (X = 0) does not result in GCC warning
3696 [20432] malloc: malloc: Minimize interface required for interposition
3697 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3698 in _Unwind_Backtrace (CVE-2016-6323)
3699 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3700 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3702 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3703 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3704 [20477] network: resolv: incorrect double-checked locking related to
3706 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3708 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3710 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3711 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3712 cause transition penalty
3713 [20517] math: sparcv9 missing fdiml compat symbol
3714 [20524] manual: strverscmp is inconsistent
3715 [20525] libc: <sys/quota.h> should be based on kernel headers
3716 [20539] math: GCC 7 -static -lm fails to link at -O3
3717 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3719 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3721 [20591] network: Remove obsolete DNSSEC support
3722 [20592] network: DNS resource record type classification macros in
3723 <arpa/nameser.h> are incorrect
3724 [20593] network: Update DNS RR type definitions
3725 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3726 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3728 [20629] network: libresolv: Remove support for bitstring labels
3730 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3731 assertion: "maxidx >= 2"
3732 [20660] math: [arm] Use VSQRT
3733 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3734 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3735 [20689] libc: Test for FMA should also check for AVX.
3736 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3737 [20715] math: iszero macro breaks existing code
3738 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3739 [20728] libc: powerpc: Missing TOC stub in clone
3740 [20729] build: glibc-2.24 fails to build for i486 with -Os
3741 [20750] build: Build fails with default PIE enabled gcc-6.x
3742 [20768] math: [alpha] sqrt fegetenv namespace
3743 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3745 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3746 __FLT_EVAL_METHOD__ is 2
3747 [20790] network: rpcgen buffer overrun in get_prog_declaration
3748 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3749 [20829] libc: crypt snprintf namespace
3750 [20847] libc: tst-vfork3 failure
3751 [20855] math: Default bits/mathdef.h has inappropriate float_t
3752 [20859] math: [sh4] FP_ILOGB0 invalid
3753 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3754 U+20AC), not same as GBK
3755 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3756 [20916] math: pow handling of sNaN arguments
3757 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3758 [20919] math: Bad pow (qNaN, 0) result with -lieee
3759 [20940] math: hypot sNaN handling
3760 [20947] math: fmax, fmin sNaN handling
3761 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3762 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3764 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3765 [20973] nptl: robust mutexes: Lost wake-ups
3766 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3767 [20978] nis: strlen on null pointer in nss_nisplus
3768 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3770 [21014] string: i686 memchr overflows internal pointer check
3771 [21019] libc: [mips] n32 lseek incorrect on overflow
3772 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3773 [21026] libc: [MIPS] readahead syscall is broken on n64
3774 [21028] math: Fallback fesetexceptflag should always succeed
3775 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3776 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3778 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3779 [21061] librt: [microblaze] librt lost clock_* exports
3780 [21073] libc: tunables: insecure environment variables passed to
3781 subprocesses with AT_SECURE
3782 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3786 * The minimum Linux kernel version that this version of the GNU C Library
3787 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3788 kernel version 2.6.32 or later suffices (on architectures that already
3789 required kernel versions more recent than 3.2, those requirements remain
3790 unchanged). Linux 3.2 or later kernel headers are required on all
3793 * The pap_AN locale has been deleted. This has been deprecated for a long
3794 time. It has been replaced by pap_AW & pap_CW, both of which have long
3795 been included in previous releases.
3797 * The readdir_r and readdir64_r functions have been deprecated. It is
3798 recommended to use readdir and readdir64 instead.
3800 * The type “union wait” has been removed. It was deprecated in the early
3801 1990s and never part of POSIX. Application code should use the int type
3802 instead of “union wait”.
3804 * A new NSS action is added to facilitate large distributed system
3805 administration. The action, MERGE, allows remote user stores like LDAP
3806 to be merged into local user stores like /etc/groups in order to provide
3807 easy to use, updated, and managed sets of merged credentials. The new
3808 action can be used by configuring it in /etc/nsswitch.conf:
3809 group: files [SUCCESS=merge] nis
3810 Implemented by Stephen Gallagher (Red Hat).
3812 * The deprecated __malloc_initialize_hook variable has been removed from the
3815 * The long unused localedef --old-style option has been removed. It hasn't
3816 done anything in over 16 years. Scripts using this option can safely
3819 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3820 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3821 return the next representable value in the direction of positive infinity
3822 and the nextdown functions return the next representable value in the
3823 direction of negative infinity. These are currently enabled as GNU
3826 Security related changes:
3828 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3829 could result in a stack overflow when getnetbyname was called with an
3830 overly long name. (CVE-2016-3075)
3832 * Previously, getaddrinfo copied large amounts of address data to the stack,
3833 even after the fix for CVE-2013-4458 has been applied, potentially
3834 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3835 instead. Reported by Michael Petlan. (CVE-2016-3706)
3837 * The glob function suffered from a stack-based buffer overflow when it was
3838 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3839 Reported by Alexander Cherepanov. (CVE-2016-1234)
3841 * The Sun RPC UDP client could exhaust all available stack space when
3842 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3843 alloca plugin for GCC. (CVE-2016-4429)
3845 * The IPv6 name server management code in libresolv could result in a memory
3846 leak for each thread which is created, performs a failing naming lookup,
3847 and exits. Over time, this could result in a denial of service due to
3848 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3850 The following bugs are resolved with this release:
3852 [1170] localedata: ne_NP: update Nepali locale definition file
3853 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3855 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3856 [6796] math: fdim() does not set errno on overflow
3857 [10354] libc: posix_spawn should use vfork() in more cases than presently
3858 [11213] localedata: localedata: add copyright disclaimer to locale files
3859 [12143] localedata: chr_US: new Cherokee locale
3860 [12450] localedata: sgs_LT: new locale
3861 [12676] localedata: ln_CD: new locale
3862 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3864 [13304] math: fma, fmaf, fmal produce wrong results
3865 [14259] build: --localedir arg to configure is ignored
3866 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3867 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3868 [14934] localedata: es_CL: wrong first weekday chilean locale
3869 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3871 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3873 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3874 [15368] nptl: raise() is not async-signal-safe
3875 [15479] math: ceil, floor, round and trunc raise inexact exception
3876 [15578] localedata: kk_KZ: various updates
3877 [16003] localedata: pap_AN: punt old locale
3878 [16137] localedata: iw_IL: punt old locale
3879 [16190] localedata: eo: new esperanto locale
3880 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3881 [16742] malloc: race condition: pthread_atfork() called before first
3882 malloc() results in unexpected locking behaviour/deadlocks
3883 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3885 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3886 [17565] localedata: pt_PT: wrong (work-)week start
3887 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3888 [17950] build: Build fails with -msse
3889 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3890 [18433] libc: posix_spawn does not return correctly upon failure to
3892 [18453] localedata: charmaps/IBM875: incorrect codes
3893 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3895 [18896] localedata: he_IL: improvements for currency
3896 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3897 Romanian locale data
3898 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3900 [19056] libc: Deprecate readdir_r
3901 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3903 [19198] localedata: nl_NL: small improvements for Dutch locales
3904 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3905 nameservers (CVE-2016-5417)
3906 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3908 [19400] locale: Language missing in "iso-639.def", trivial fix in
3910 [19431] malloc: Deadlock between fflush, getdelim, and fork
3911 [19505] libc: Incorrect file descriptor validity checks in
3912 posix_spawn_file_actions_add{open,close,dup2}
3913 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3914 when using RTLD_NEXT
3915 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3916 `intl/{gettextP,loadinfo}.h'
3917 [19534] libc: execle, execlp may use malloc
3918 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3919 [19573] network: res_nclose and __res_maybe_init disagree about name
3920 server initialization, breaking Hesiod
3921 [19575] localedata: Status of GB18030 tables
3922 [19581] localedata: sr_* date_fmt string contains additional newline
3923 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3925 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3926 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3927 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3928 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3930 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3932 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3934 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3935 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3936 [19633] locale: strfmon_l applies global locale to number formatting
3937 [19642] network: Memory leak in getnameinfo
3938 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3939 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3941 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3942 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3944 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3945 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3947 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3949 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3951 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3952 pointers and lengths in error-case.
3953 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3954 report errors on UTF-16 surrogates values.
3955 [19755] nscd: nscd assertion failure in gc
3956 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3957 [19759] libc: mempcpy shouldn't be inlined
3958 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3959 [19765] libc: s390 needs an optimized mempcpy
3960 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3961 NAME_MAX limit assumption (CVE-2016-1234)
3962 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3963 [19787] network: Missing and incorrect truncation checks in getnameinfo
3964 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3966 [19791] network: Assertion failure in res_query.c with un-connectable name
3968 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3969 [19822] math: libm.so install clobbers old version
3970 [19825] network: resolv: send_vc can return uninitialized data in second
3971 response to getaddrinfo
3972 [19830] network: nss_dns: should check RDATA length against buffer length
3973 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3974 confronted with A/AAAA records of invalid size
3975 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3976 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3977 [19853] stdio: Printing IBM long double in decimal with high precision is
3979 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3980 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3981 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3983 [19865] network: Assertion failure or memory leak in
3984 _nss_dns_getcanonname_r
3985 [19868] network: nss_dns: netent code does not skip over non-PTR records
3986 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3988 [19881] string: Improve x86-64 memset
3989 [19907] string: Incorrect memcpy tests
3990 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3992 [19925] libc: termios.h XCASE namespace
3993 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3994 [19929] libc: limits.h NL_NMAX namespace
3995 [19931] stdio: Memory leak in vfprintf
3996 [19957] libc: clone(CLONE_VM) access invalid parent memory
3997 [19963] localedata: en_IL: New locale
3998 [19989] stdio: stdio.h cuserid namespace
3999 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4001 [19996] locale: langinfo.h nl_langinfo_l namespace
4002 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4003 [20010] network: getaddrinfo: Stack overflow in hostent translation
4005 [20012] stdio: libio: fmemopen append mode failure
4006 [20014] stdio: stdio.h namespace for pre-threads POSIX
4007 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4008 [20023] libc: fcntl.h timespec namespace
4009 [20024] math: [x86_64] vectorized sincos trashes the stack
4010 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4011 [20041] time: sys/time.h timespec namespace
4012 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4013 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4014 [20051] libc: ttyslot in wrong header under wrong conditions
4015 [20054] libc: gethostname not declared for XPG4
4016 [20055] libc: termios.h missing tcgetsid for XPG4
4017 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4019 [20073] libc: sys/stat.h fchmod namespace
4020 [20074] libc: stdlib.h rand_r namespace
4021 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4022 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4024 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4025 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4027 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4028 [20119] libc: Wrong mask for processors level type from CPUID
4029 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4030 AS not supporting AVX512
4031 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4033 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4034 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4036 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4037 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4038 [20178] libc: posix_spawn{p} should not call exit
4039 [20191] stdio: libio: vtables hardening
4040 [20195] string: FMA4 detection requires CPUID execution with register
4042 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4043 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4045 [20212] math: acos (sNaN) returns sNaN
4046 [20213] math: asin (sNaN) returns sNaN
4047 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4048 [20218] math: [i386] asinhl (sNaN) returns sNaN
4049 [20219] math: [i386] atanhl (sNaN) returns sNaN
4050 [20222] stdio: fopencookie: Mangle function pointers
4051 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4052 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4053 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4055 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4056 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4057 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4058 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4059 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4060 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4061 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4062 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4063 [20240] math: modf (sNaN) returns sNaN
4064 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4065 [20250] math: frexp (sNaN) returns sNaN
4066 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4067 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4069 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4070 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4071 subscript is below array bounds [-Werror=array-bounds]
4072 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4073 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4075 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4076 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4078 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4079 "invalid" exceptions
4080 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4081 [20316] localedata: id_ID: Februari instead of Pebruari
4082 [20327] string: POWER8 strcasecmp returns incorrect result
4083 [20347] math: Failure: Test: j0_downward (0xap+0)
4084 [20348] libc: FAIL: misc/tst-preadvwritev64
4085 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4086 [20350] libc: There is no test for p{read,write}64
4087 [20357] math: Incorrect cos result for 1.5174239687223976
4088 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4092 * Unicode 8.0.0 Support: Character encoding, character type info, and
4093 transliteration tables are all updated to Unicode 8.0.0, using new
4094 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4095 These updates cause user visible changes, such as the fixes for bugs
4096 89, 16061, and 18568.
4098 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4099 kernel-internal CPU set size. This means that requests that change the
4100 CPU affinity which failed before (for example, an all-ones CPU mask) will
4101 now succeed. Applications that need to determine the effective CPU
4102 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4103 setting it because the kernel can adjust it (and the previous size check
4104 would not detect this in the majority of cases).
4106 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4107 the following new symbols are used: fts64_children, fts64_close,
4108 fts64_open, fts64_read and fts64_set.
4110 * getaddrinfo now detects certain invalid responses on an internal netlink
4111 socket. If such responses are received, an affected process will
4112 terminate with an error message of "Unexpected error <number> on netlink
4113 descriptor <number>" or "Unexpected netlink response of size <number> on
4114 descriptor <number>". The most likely cause for these errors is a
4115 multi-threaded application which erroneously closes and reuses the netlink
4116 file descriptor while it is used by getaddrinfo.
4118 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4119 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4120 unnecessary serialization of memory allocation requests across threads.
4121 The defect is now corrected. Users should see a substantial increase in
4122 the concurent throughput of allocation requests for applications which
4123 trigger this bug. Affected applications typically create and
4124 destroy threads frequently. (Bug 19048 was reported and analyzed by
4127 * There is now a --disable-timezone-tools configure option for disabling the
4128 building and installing of the timezone related utilities (zic, zdump, and
4129 tzselect). This is useful for people who build the timezone data and code
4130 independent of the GNU C Library.
4132 * The obsolete header <regexp.h> has been removed. Programs that require
4133 this header must be updated to use <regex.h> instead.
4135 * The obsolete functions bdflush, create_module, get_kernel_syms,
4136 query_module and uselib are no longer available to newly linked binaries;
4137 the header <sys/kdaemon.h> has been removed. These functions and header
4138 were specific to systems using the Linux kernel and could not usefully be
4139 used with the GNU C Library on systems with version 2.6 or later of the
4142 * Optimized string, wcsmbs and memory functions for IBM z13.
4143 Implemented by Stefan Liebler.
4145 * Newly linked programs that define a variable called signgam will no longer
4146 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4147 require signgam to be set by those functions must ensure that they use the
4148 variable provided by the GNU C Library and declared in <math.h>, without
4149 defining their own copy.
4151 * The minimum GCC version that can be used to build this version of the GNU
4152 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4153 still be used to compile programs using the GNU C Library.
4155 Security related changes:
4157 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4158 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4160 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4161 the pointer guard feature. It is always enabled. Previously,
4162 LD_POINTER_GUARD could be used to disable security hardening in binaries
4163 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4166 * An integer overflow in hcreate and hcreate_r could lead to an
4167 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4169 * The catopen function no longer has unbounded stack usage. Reported by
4170 Max. (CVE-2015-8779)
4172 * The nan, nanf and nanl functions no longer have unbounded stack usage
4173 depending on the length of the string passed as an argument to the
4174 functions. Reported by Joseph Myers. (CVE-2014-9761)
4176 * A stack-based buffer overflow was found in libresolv when invoked from
4177 libnss_dns, allowing specially crafted DNS responses to seize control
4178 of execution flow in the DNS client. The buffer overflow occurs in
4179 the functions send_dg (send datagram) and send_vc (send TCP) for the
4180 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4181 family. The use of AF_UNSPEC triggers the low-level resolver code to
4182 send out two parallel queries for A and AAAA. A mismanagement of the
4183 buffers used for those queries could result in the response of a query
4184 writing beyond the alloca allocated buffer created by
4185 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4186 the overflow. Thanks to the Google Security Team and Red Hat for
4187 reporting the security impact of this issue, and Robert Holiday of
4188 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4190 The following bugs are resolved with this release:
4192 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4193 [887] math: Math library function "logb" and "nextafter" inconsistent
4194 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4195 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4196 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4197 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4199 [4404] localedata: German translation of "Alarm clock" is misleading
4200 [6799] math: nextafter() and nexttoward() doen't set errno on
4201 overflow/underflow errors
4202 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4204 [10432] nis: _nss_nis_setnetgrent assertion failure
4205 [11460] libc: fts has no LFS support
4206 [12926] network: getaddrinfo()/make_request() may spin forever
4207 [13065] nptl: Race condition in pthread barriers
4208 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4209 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4211 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4212 [14912] libc: Rename non-installed bits/*.h headers
4213 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4214 [15367] math: Let gcc use __builtin_isinf
4215 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4216 [15421] math: lgamma wrongly sets signgam for ISO C
4217 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4218 FE_INVALID with argument out of range
4219 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4221 [15786] dynamic-link: ifunc resolver functions can smash function
4223 [15918] math: Unnecessary check for equality in hypotf()
4224 [16061] localedata: Review / update transliteration data
4225 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4227 [16141] time: strptime %z offset restriction
4228 [16171] math: drem should be alias of remainder
4229 [16296] math: fegetround is pure?
4230 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4231 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4233 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4234 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4236 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4237 "Exception "Inexact" set" on ppc32
4238 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4239 [16517] math: Missing underflow exception from tanf/tan/tanl
4240 [16519] math: Missing underflow exception from sinhf
4241 [16520] math: Missing underflow exception from tanhf
4242 [16521] math: Missing underflow exception from exp2
4243 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4245 [16734] stdio: fopen calls mmap to allocate its buffer
4246 [16961] math: nan function incorrect handling of bad sequences
4247 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4248 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4249 [16985] locale: localedef: confusing error message when opening output
4251 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4252 [17197] locale: Redundant shift character in iconv conversion output at
4254 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4255 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4256 [17250] dynamic-link: static linking breaks nss loading
4257 (getaddrinfo/getpwnam/etc...)
4258 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4260 [17441] math: isnan() should use __builtin_isnan() in GCC
4261 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4262 (related to lock elision)
4263 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4264 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4265 [17887] time: strptime should be able to parse "+01:00" style timezones
4266 [17905] libc: catopen() Multiple unbounded stack allocations
4268 [18084] libc: backtrace (..., 0) dumps core on x86
4269 [18086] libc: nice() sets errno to 0 on success
4270 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4271 is too large (CVE-2015-8778)
4272 [18251] dynamic-link: SONAME missing when audit modules provides path
4273 [18265] libc: add attributes for wchar string and memory functions
4274 [18370] math: csqrt missing underflows
4275 [18421] libc: [hppa] read-only segment has dynamic relocations
4276 [18472] libc: Obsolete syscall wrappers should be compat symbols
4277 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4278 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4279 [18525] localedata: Remove locale timezone information
4280 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4281 [18568] localedata: Update locale data to Unicode 8.0
4282 [18589] locale: sort-test.sh fails at random
4283 [18595] math: ctan, ctanh missing underflows
4284 [18604] libc: assert macro-expands its argument
4285 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4286 contains a vector instruction exception.
4287 [18611] math: j1, jn missing errno setting on underflow
4288 [18618] localedata: sync Chechen locale definitions with other *_RU
4290 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4291 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4292 [18665] network: In send_dg, the recvfrom function is NOT always using the
4293 buffer size of a newly created buffer (CVE-2015-7547)
4294 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4296 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4298 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4299 [18699] math: tilegx cproj() for various complex infinities does not yield
4301 [18724] libc: Harden put*ent functions against data injection
4302 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4303 [18755] build: build errors with -DNDEBUG
4304 [18757] stdio: fmemopen fails to set errno on failure
4305 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4307 [18781] libc: openat64 lacks O_LARGEFILE
4308 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4309 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4310 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4311 [18790] math: [ldbl-128ibm] tanhl inaccurate
4312 [18795] libc: stpncpy fortification misses buffer lengths that are
4313 statically too large
4314 [18796] build: build fails for --disable-mathvec
4315 [18803] math: hypot missing underflows
4316 [18820] stdio: fmemopen may leak memory on failure
4317 [18823] math: csqrt spurious underflows
4318 [18824] math: fma spurious underflows
4319 [18825] math: pow missing underflows
4320 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4321 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4322 [18870] build: sem_open.c fails to compile with missing symbol
4324 [18872] stdio: Fix memory leak in printf_positional
4325 [18873] libc: posix_fallocate overflow check ineffective
4326 [18875] math: Excess precision leads incorrect libm
4327 [18877] libc: arm: mmap offset regression
4328 [18887] libc: memory corruption when using getmntent on blank lines
4329 [18918] localedata: hu_HU: change time to HH:MM:SS format
4330 [18921] libc: Regression: extraneous stat() and fstat() performed by
4332 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4333 binaries (CVE-2015-8777)
4334 [18951] math: tgamma missing underflows
4335 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4337 [18953] localedata: lt_LT: change currency symbol to the euro
4338 [18956] math: powf inaccuracy
4339 [18961] math: [i386] exp missing underflows
4340 [18966] math: [i386] exp10 missing underflows
4341 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4342 [18969] build: multiple string test failures due to missing locale
4344 [18970] libc: Reference of pthread_setcancelstate in libc.a
4345 [18977] math: float / long double Bessel functions not in XSI POSIX
4346 [18980] math: i386 libm functions return with excess range and precision
4347 [18981] math: i386 scalb*, ldexp return with excess range and precision
4348 [18982] stdio: va_list and vprintf
4349 [18985] time: Passing out of range data to strftime() causes a segfault
4351 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4352 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4353 [19012] locale: iconv_open leaks memory on error path
4354 [19016] math: clog, clog10 inaccuracy
4355 [19018] nptl: Mangle function pointers in tls_dtor_list
4356 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4357 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4358 [19048] malloc: malloc: arena free list can become cyclic, increasing
4360 [19049] math: [powerpc] erfc incorrect zero sign
4361 [19050] math: [powerpc] log* incorrect zero sign
4362 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4363 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4364 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4365 [19074] network: Data race in _res_hconf_reorder_addrs
4366 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4367 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4368 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4370 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4372 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4373 [19086] manual: posix_fallocate64 documented argument order is wrong.
4374 [19088] math: lround, llround missing exceptions close to overflow
4376 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4377 [19095] math: dbl-64 lrint incorrect for 64-bit long
4378 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4379 [19124] dynamic-link: ld.so failed to build with older assmebler
4380 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4381 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4382 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4383 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4384 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4385 pthread_setaffinity_np
4386 [19156] math: [ldbl-128] j0l spurious underflows
4387 [19164] nptl: tst-getcpu fails with many possible CPUs
4388 [19168] math: math/test-ildoubl and math/test-ldouble failure
4389 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4390 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4392 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4393 (FE_NOMASK_ENV) do not clear SSE exceptions
4394 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4395 _int_new_arena/reused_arena
4396 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4397 [19201] math: dbl-64 remainder incorrect sign of zero result
4398 [19205] math: bits/math-finite.h conditions do not match math.h and
4400 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4401 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4402 for C99-based standards
4403 [19212] libc: features.h not -Wundef clean
4404 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4406 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4407 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4408 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4410 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4411 "inexact" exceptions
4412 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4414 [19242] libc: strtol incorrect in Turkish locales
4415 [19243] malloc: reused_arena can pick an arena on the free list, leading
4416 to an assertion failure and reference count corruption
4417 [19253] time: tzset() ineffective when temporary TZ did not include DST
4419 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4420 [19270] math: [hppa] Shared libm missing __isnanl
4421 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4422 MAP_HUGETLB and MAP_STACK defines
4423 [19313] nptl: Wrong __cpu_mask for x32
4424 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4425 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4426 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4427 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4428 [19363] time: x32: times() return value wrongly truncates/sign extends
4430 [19367] dynamic-link: Improve branch prediction on Silvermont
4431 [19369] network: Default domain name not reset by res_ninit when "search"
4432 / "domain" entry is removed from resolv.conf
4433 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4435 [19385] localedata: bg_BG: time separator should be colon, not comma
4436 [19408] libc: linux personality syscall wrapper may erroneously return an
4437 error on 32-bit architectures
4438 [19415] libc: dladdr returns wrong names on hppa
4439 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4440 IBM905, IBM907, and IBM909
4441 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4442 [19443] build: build failures with -DDEBUG
4443 [19451] build: Make check fails on test-double-vlen2
4444 [19462] libc: Glibc failed to build with -Os
4445 [19465] math: Wrong code with -Os
4446 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4448 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4450 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4451 [19486] math: S390: Math tests fail with "Exception Inexact set".
4452 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4453 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4455 [19590] math: Fail to build shared objects that use libmvec.so functions.
4459 * The following bugs are resolved with this release:
4461 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4462 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4463 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4464 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4465 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4466 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4467 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4468 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4469 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4470 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4471 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4472 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4473 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4474 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4475 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4476 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4477 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4478 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4479 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4480 18657, 18676, 18694, 18696, 18887.
4482 * Cache information can be queried via sysconf() function on s390 e.g. with
4483 _SC_LEVEL1_ICACHE_SIZE as argument.
4485 * A buffer overflow in gethostbyname_r and related functions performing DNS
4486 requests has been fixed. If the NSS functions were called with a
4487 misaligned buffer, the buffer length change due to pointer alignment was
4488 not taken into account. This could result in application crashes or,
4489 potentially arbitrary code execution, using crafted, but syntactically
4490 valid DNS responses. (CVE-2015-1781)
4492 * The time zone file parser has been made more robust against crafted time
4493 zone files, avoiding heap buffer overflows related to the processing of
4494 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4495 large time zone data files. Overly long time zone specifiers in the TZ
4496 variable no longer result in stack overflows and crashes.
4498 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4499 for LD and GD on x86 and x86-64, has been implemented. You will need
4500 binutils-2.24 or later to enable this optimization.
4502 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4503 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4504 Hat). These updates cause user visible changes, such as the fix for bug
4507 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4508 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4509 condition in some applications.
4511 * Added vector math library named libmvec with the following vectorized x86_64
4512 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4514 The library can be disabled with --disable-mathvec. Use of the functions is
4515 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4516 Shared library libmvec.so is linked in as needed when using -lm (no need to
4517 specify -lmvec explicitly for not static builds).
4518 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4520 * A new fmemopen implementation has been added with the goal of POSIX
4521 compliance. The new implementation fixes the following long-standing
4522 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4523 old implementation is still present for use be by existing binaries.
4525 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4526 releases. It has been fixed to match 2.19 and older, but binaries built
4527 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4529 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4530 Contributed by Roland McGrath (Google).
4532 * The header <regexp.h> is deprecated, and will be removed in a future
4533 release. Use of this header will trigger a deprecation warning.
4534 Application developers should update their code to use <regex.h> instead.
4536 This header was formerly part of SUS, but was deprecated in 1994 and
4537 removed from the standard in 2001. Also, the glibc implementation
4538 leaks memory. See BZ#18681 for more details.
4542 * The following bugs are resolved with this release:
4544 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4545 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4546 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4547 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4548 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4549 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4550 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4551 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4552 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4553 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4556 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4557 too little memory for the to-be-scanned arguments and overflow the
4558 allocated buffer. The implementation now correctly computes the required
4559 buffer size when using malloc, and switches to malloc from alloca as
4562 * A new semaphore algorithm has been implemented in generic C code for all
4563 machines. Previous custom assembly implementations of semaphore were
4564 difficult to reason about or ensure that they were safe. The new version
4565 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4566 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4567 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4569 * Port to Altera Nios II has been contributed by Mentor Graphics.
4571 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4572 implementations for powerpc64/powerpc64le.
4573 Implemented by Adhemerval Zanella (IBM).
4575 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4576 and powerpc64le. This may improve lock scaling of existing programs on
4577 HTM capable systems. The lock elision code is only enabled with
4578 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4579 powerpc will issue a transaction abort on every syscall to avoid side
4580 effects being visible outside transactions.
4582 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4583 AArch64. Contributed by ARM Ltd.
4585 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4587 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4588 under certain input conditions resulting in the execution of a shell for
4589 command substitution when the application did not request it. The
4590 implementation now checks WRDE_NOCMD immediately before executing the
4591 shell and returns the error WRDE_CMDSUB as expected.
4593 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4594 processing format strings with a large number of format specifiers.
4596 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4597 infinite loop if the DNS response contained a PTR record of an unexpected
4600 * The minimum GCC version that can be used to build this version of the GNU
4601 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4602 still be used to compile programs using the GNU C Library.
4604 * The GNU C Library is now built with -Werror by default. This can be
4605 disabled by configuring with --disable-werror.
4607 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4609 * The obsolete sigvec function has been removed. This was the original
4610 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4611 programs have been using instead for about 25 years. Of course, ABI
4612 compatibility for old binaries using sigvec remains intact.
4614 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4615 with newer versions of bison.
4617 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4618 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4619 registers overlay two consecutive single-precision registers. MIPS32R2
4620 introduced a new FPU mode (FR=1) where double-precision registers extend the
4621 corresponding single-precision registers which is incompatible with the
4622 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4623 require the use of FR=1 making a transition necessary. New o32 ABI
4624 extensions enable users to migrate over time from the original o32 ABI
4625 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4626 tracks the ABI of any loaded object and verifies that new objects are
4627 compatible. Mode transitions will also be requested as required and
4628 unsupportable objects will be rejected. The ABI checks include both soft and
4629 hard float ABIs for o32, n32 and n64.
4631 GCC 5 with GNU binutils 2.25 onwards:
4632 It is strongly recommended that all o32 system libraries are built using the
4633 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4634 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4635 compiler using --with-fp-32=xx to set this by default.
4639 * The following bugs are resolved with this release:
4641 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4642 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4643 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4644 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4645 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4646 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4647 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4648 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4649 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4650 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4651 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4652 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4653 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4654 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4655 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4657 * Reverted change of ABI data structures for s390 and s390x:
4658 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4659 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4660 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4661 are preserved pointing straight to the same implementation as the old ones.
4662 Given that, new callers will simply provide a too-big buffer to these
4663 functions. Any applications/libraries out there that embed jmp_buf or
4664 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4665 against 2.19 headers will have to rebuilt again. This is necessary in any
4666 case to revert the breakage in their ABI caused by the glibc change.
4668 * Support for file description locks is added to systems running the
4669 Linux kernel. The standard file locking interfaces are extended to
4670 operate on file descriptions, not file descriptors, via the use of
4671 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4672 are associated with an open file instead of a process.
4674 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4676 * The minimum Linux kernel version that this version of the GNU C Library
4677 can be used with is 2.6.32.
4679 * Running the testsuite no longer terminates as soon as a test fails.
4680 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4681 with PASS or FAIL lines for individual tests. A summary of the results is
4682 printed, including a list of failing lists, and "make check" exits with
4683 error status if there were any unexpected failures. "make check
4684 stop-on-test-failure=y" may be used to keep the old behavior.
4686 * The am33 port, which had not worked for several years, has been removed
4689 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4690 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4691 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4692 conflicted with POSIX (support for which was removed in 2.19), the
4693 interfaces those macros enabled remain available when compiling with
4694 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4695 test macros defined.
4697 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4699 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4700 This may improve lock scaling of existing programs on TX capable systems.
4701 The lock elision code is only built with --enable-lock-elision=yes and
4702 then requires a GCC version supporting the TX builtins. With lock elision
4703 default mutexes are elided via __builtin_tbegin, if the cpu supports
4704 transactions. By default lock elision is not enabled and the elision code
4707 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4708 copy the path argument. This allowed programs to cause posix_spawn to
4709 deference a dangling pointer, or use an unexpected pathname argument if
4710 the string was modified after the posix_spawn_file_actions_addopen
4713 * All supported architectures now use the main glibc sysdeps directory
4714 instead of some being in a separate "ports" directory (which was
4715 distributed separately before glibc 2.17).
4717 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4718 On configurations that support it (all Linux configurations), it's now
4719 used regardless of the --enable-add-ons switch to configure. It is no
4720 longer possible to build such configurations without pthreads support.
4722 * Locale names, including those obtained from environment variables (LANG
4723 and the LC_* variables), are more tightly checked for proper syntax.
4724 setlocale will now fail (with EINVAL) for locale names that are overly
4725 long, contain slashes without starting with a slash, or contain ".." path
4726 components. (CVE-2014-0475) Previously, some valid locale names were
4727 silently replaced with the "C" locale when running in AT_SECURE mode
4728 (e.g., in a SUID program). This is no longer necessary because of the
4731 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4732 with application code using Intel MPX instructions. (With all previous
4733 versions, the MPX register state could be clobbered when making calls
4734 into or out of a shared library.) Note that while the new dynamic
4735 linker is compatible with all known x86 hardware whether or not it
4736 supports Intel MPX, some x86 instruction-set emulators might fail to
4737 handle the new instruction encodings. This is known to affect Valgrind
4738 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4739 release), and might affect other tools that do instruction emulation.
4741 * Support for loadable gconv transliteration modules has been removed.
4742 The support for transliteration modules has been non-functional for
4743 over a decade, and the removal is prompted by security defects. The
4744 normal gconv conversion modules are still supported. Transliteration
4745 with //TRANSLIT is still possible, and the //IGNORE specifier
4746 continues to be supported. (CVE-2014-5119)
4748 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4749 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4750 resulting a denial-of-service security vulnerability in applications which
4751 use functions related to iconv. (CVE-2014-6040)
4755 * The following bugs are resolved with this release:
4757 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4758 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4759 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4760 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4761 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4762 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4763 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4764 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4765 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4766 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4767 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4768 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4769 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4770 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4771 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4772 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4773 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4774 16431, 16453, 16474, 16506, 16510, 16529
4776 * Slovenian translations for glibc messages have been contributed by the
4777 Translation Project's Slovenian team of translators.
4779 * The public headers no longer use __unused nor __block. This change is to
4780 support compiling programs that are derived from BSD sources and use
4781 __unused internally, and to support compiling with Clang's -fblock
4782 extension which uses __block.
4784 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4785 large collation sequences to optimize multiple passes. This cache
4786 computation may overflow for large collation sequences and may cause a
4787 stack or buffer overflow. This is now fixed to use a slower algorithm
4788 which does not use a cache if there is an integer overflow.
4790 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4791 rules for large collation sequences to optimize multiple passes and falls
4792 back to alloca if malloc fails, resulting in a possible stack overflow.
4793 The implementation now falls back to an uncached collation sequence lookup
4796 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4797 initialized for static applications resulting in the security feature
4798 being disabled. The pointer guard is now correctly initialized to a
4799 random value for static applications. Existing static applications need
4800 to be recompiled to take advantage of the fix (bug 15754).
4802 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4803 to the d_name member of struct dirent, or omit the terminating NUL
4804 character. (Bugzilla #14699).
4806 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4807 aligned_alloc functions could allocate too few bytes or corrupt the
4808 heap when passed very large allocation size values (Bugzilla #15855,
4811 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4812 for AF_INET6 has been fixed (Bugzilla #16072).
4814 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4815 pap_CW, quz_PE, the_NP.
4817 * Substantially revised locales: gd_GB, ht_HT
4819 * The LC_ADDRESS field was updated to support country_car for almost all
4822 * ISO 1427 definitions were updated.
4824 * ISO 3166 definitions were updated.
4826 * The localedef utility now supports --big-endian and --little-endian
4827 command-line options to generate locales for a different system from that
4828 for which the C library was built.
4830 * Binary locale files now only depend on the endianness of the system for
4831 which they are generated and not on other properties of that system. As a
4832 consequence, binary files generated with new localedef may be incompatible
4833 with old versions of the GNU C Library, and binary files generated with
4834 old localedef may be incompatible with this version of the GNU C Library,
4835 in the following circumstances:
4837 + Locale files may be incompatible on m68k systems.
4839 + Locale archive files (but not separate files for individual locales) may
4840 be incompatible on systems where plain "char" is signed.
4842 * The configure option --disable-versioning has been removed. Builds with
4843 --disable-versioning had not worked for several years.
4845 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4846 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4848 * SystemTap probes for malloc have been introduced.
4850 * SystemTap probes for slow multiple precision fallback paths of
4851 transcendental functions have been introduced.
4853 * Support for powerpc64le has been added.
4855 * The soft-float powerpc port now supports e500 processors.
4857 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4859 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4860 set of header declarations that are enabled by default, even when other
4861 feature test macros or compiler options such as -std=c99 would otherwise
4862 disable some of those declarations.
4864 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4865 conflict with POSIX. The libbsd-compat library (which was a dummy library
4866 that did nothing) has also been removed.
4868 * Preliminary documentation about Multi-Thread, Async-Signal and
4869 Async-Cancel Safety has been added.
4871 * Change of ABI data structures for s390 and s390x:
4872 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4873 allow for future hardware extensions. All library functions that accept or
4874 return these structures were versioned in order to provide backwards
4875 compatibility with existing code. However, not all cases can be handled
4876 with interface versioning. If an application embeds either structure into
4877 another structure and that structure is passed to another compilation unit
4878 which expects the newer larger-sized object then any access to the new
4879 fields will result in undefined behaviour. Similarly any access to fields
4880 that were moved by the enlarging of the structures will cause undefined
4881 behaviour. To fix the undefined behaviour all objects that are part of the
4882 final in-memory image must agree on the size of structures, and this may
4883 require recompilation.
4887 * The following bugs are resolved with this release:
4889 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4890 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4891 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4892 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4893 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4894 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4895 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4896 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4897 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4898 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4899 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4900 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4901 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4904 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4905 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4906 Distributions can re-enable building and using pt_chown via the new configure
4907 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4908 considerable security risks and should only be used if the distribution
4909 understands and accepts the risks.
4911 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4914 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4915 fixed (Bugzilla #15330).
4917 * Add support for calling C++11 thread_local object destructors on thread
4918 and program exit. This needs compiler support for offloading C++11
4919 destructor calls to glibc.
4921 * Improved worst case performance of libm functions with double inputs and
4924 * Support for priority inherited mutexes in pthread condition variables on
4925 non-x86 architectures.
4927 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4929 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4931 * Optimized string functions for ARM. Implemented by Will Newton and
4934 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4936 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4939 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4940 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4942 * Added a benchmark framework to track performance of functions in glibc.
4944 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4945 It is based on draft TS 18661 and currently enabled as a GNU extension.
4947 * On Linux, the clock function now uses the clock_gettime system call
4948 for improved precision, rather than old times system call.
4950 * Added support for version-3 tz format files. This is needed when using
4951 the tz database release 2013e or later, and affects a few unusual cases --
4952 currently only TZ='America/Godthab' for time stamps after 2037.
4954 * Added new API functions pthread_getattr_default_np and
4955 pthread_setattr_default_np to get and set the default pthread
4956 attributes of a process.
4958 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4959 This may improve lock scaling of existing programs on TSX capable systems.
4960 When the --enable-lock-elision=yes parameter is specified at configure
4961 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4964 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4965 availability). Implemented by Ryan S. Arnold.
4967 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4971 * The following bugs are resolved with this release:
4973 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4974 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4975 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4976 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4977 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4978 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4979 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4980 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4981 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4982 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4983 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4984 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4985 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4986 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4987 14879, 14889, 14893, 14898, 14914.
4989 * Optimization of memcpy for MIPS.
4991 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4992 EMFILE has been fixed (Bugzilla #14889).
4994 * The add-on ports collection is now distributed in the "ports" subdirectory
4995 of the main GNU C Library distribution, rather than separately.
4997 * Port to ARM AArch64 contributed by Linaro.
4999 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5000 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5002 Implemented by Andreas Krebbel.
5004 * The new function secure_getenv allows secure access to the environment,
5005 returning NULL if running in a SUID/SGID process. This function replaces
5006 the internal function __secure_getenv.
5008 * SystemTap static probes have been added into the dynamic linker.
5009 Implemented by Gary Benson.
5011 * Optimizations of string functions strstr, strcasestr and memmem.
5012 Implemented by Maxim Kuvyrkov.
5014 * The minimum Linux kernel version that this version of the GNU C Library
5015 can be used with is 2.6.16.
5017 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5018 powerpc POWER7. Implemented by Will Schmidt.
5020 * New configure option --disable-nscd builds the C library such that it
5021 never attempts to contact the Name Service Caching Daemon (nscd).
5022 New configure option --disable-build-nscd avoids building nscd itself;
5023 this is the default if --disable-nscd is used.
5025 * Improved support for cross-compilation, including cross-testing and
5026 bootstrap builds without a previously built glibc.
5028 * Several testsuite tests are now able to test multiple IFUNC variants of an
5029 interface, rather than just testing the one that would be chooen by
5032 * New configure options --with-bugurl and --with-pkgversion, for
5033 distributors to use to embed their bug-reporting and package version
5034 information in --help and --version output.
5036 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5037 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5038 allows creation of chroots without the procfs mounted on /proc.
5040 * The `crypt' function now fails if passed salt bytes that violate the
5041 specification for those values. On Linux, the `crypt' function will
5042 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5043 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5044 when the mode is enabled.
5046 * The `clock_*' suite of functions (declared in <time.h>) is now available
5047 directly in the main C library. Previously it was necessary to link with
5048 -lrt to use these functions. This change has the effect that a
5049 single-threaded program that uses a function such as `clock_gettime' (and
5050 is not linked with -lrt) will no longer implicitly load the pthreads
5051 library at runtime and so will not suffer the overheads associated with
5052 multi-thread support in other code such as the C++ runtime library.
5054 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5059 * The following bugs are resolved with this release:
5061 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5062 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5063 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5064 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5065 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5066 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5067 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5068 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5069 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5070 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5071 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5072 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5073 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5074 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5075 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5076 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5077 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5078 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5079 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5080 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5081 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5082 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5085 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5086 configuring glibc with:
5087 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5088 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5089 Implemented by H.J. Lu.
5093 + define static_assert
5095 + do not declare gets
5097 + declare at_quick_exit and quick_exit also for ISO C11
5099 + aligned_alloc. NB: The code is deliberately allows the size parameter
5100 to not be a multiple of the alignment. This is a moronic requirement
5101 in the standard but it is only a requirement on the caller, not the
5104 + timespec_get added
5106 + uchar.h support added
5108 + CMPLX, CMPLXF, CMPLXL added
5110 Implemented by Ulrich Drepper.
5112 * Support for the IA-64 has been moved to ports.
5114 * Remove support for anything but ELF binary format
5116 * Checking versions of poll, ppoll added.
5117 Implemented by Ulrich Drepper.
5119 * More generic and 64-bit performance optimizations to math functions.
5120 Implemented by Ulrich Drepper.
5122 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5123 headers and functions available at compile time as they were before
5124 version 2.14. This option will be removed at some time in the future
5125 after the TI-RPC library becomes fully sufficient for the needs of
5126 existing applications.
5128 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5129 Note that glibc is not expected to work with any Linux kernel version
5132 * New header <sys/auxv.h> and function getauxval allowing easy access to
5133 the AT_* key-value pairs passed from the Linux kernel. The header also
5134 defines the HWCAP_* bits associated with the AT_HWCAP key.
5136 * New locales: mag_IN
5138 * New configure option --enable-systemtap builds SystemTap static probes
5139 into libc for setjmp and longjmp and into libpthread for various operations.
5140 So far the setjmp/longjmp probes and some of the libpthread probes are
5141 provided only for i*86 and x86_64.
5142 Implemented by Roland McGrath and Rayson Ho.
5144 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5146 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5149 * More optimized functions for SPARC. Implemented by David S. Miller.
5151 * Improved support for cross-compilation, especially bootstrap builds
5152 without a previously built glibc.
5154 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5155 Chris Metcalf from Tilera.
5157 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5158 now supported for ARM processors.
5160 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5161 as the name of the dynamic linker, to distinguish it from the
5162 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5164 * Support for CRIS has been removed from ports.
5166 * A new class of installed header has been documented for low-level
5167 platform-specific functionality. PowerPC added the first instance with a
5168 function to provide time base register access. Contributed by Tulio
5169 Magno Quites Machado Filho.
5171 * ix86 configurations now install header files that are consistent with
5172 what x86-64 configurations install. These same header files can be used
5173 for -m32, -m64, or -mx32 builds.
5174 Contributed by H.J. Lu.
5176 * Math library bug fixes. A thorough audit of all open math library bugs was
5177 conducted by Joseph Myers. Significant progress was made on many math
5178 library bugs resulting in more accurate exceptions and function results.
5179 Many thanks to all those that contributed including Andreas Jaeger for his
5180 patch review and work on the x87 trigonometric instruction issues.
5182 * Timezone data is no longer installed. Timezone-related binaries and scripts
5183 will continue to be installed. Users should obtain their timezone data from
5184 their distribution provider or from the tzdata package at
5185 <ftp://munnari.oz.au/pub/>.
5189 * The following bugs are resolved with this release:
5191 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5192 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5193 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5194 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5195 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5196 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5197 13484, 13506, 13515, 13523, 13524, 13538, 13540
5199 * New program pldd to list loaded object of a process
5200 Implemented by Ulrich Drepper.
5202 * Add nss_db support back to glibc. No more dependency on Berkeley db
5203 and support for initgroups lookups.
5204 Implemented by Ulrich Drepper.
5206 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5207 Contributed by HJ Lu.
5209 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5210 Contributed by HJ Lu.
5212 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5213 on x86-32 and x86-64.
5214 Contributed by Liubov Dmitrieva.
5216 * Optimized strchr and strrchr for SSE on x86-32.
5217 Contributed by Liubov Dmitrieva.
5219 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5220 for x86-64 and x86-32.
5221 Contributed by Liubov Dmitrieva.
5223 * New interfaces: scandirat, scandirat64
5224 Implemented by Ulrich Drepper.
5226 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5227 Implemented by Ulrich Drepper.
5229 * nscd now also caches the netgroup database.
5230 Implemented by Ulrich Drepper.
5232 * Integrate libm with gcc's -ffinite-math-only option.
5233 Implemented by Ulrich Drepper.
5235 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5236 to math functions. Implemented by Ulrich Drepper.
5238 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5239 Implemented by Ulrich Drepper.
5241 * New Linux interfaces: process_vm_readv, process_vm_writev
5243 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5244 Implemented by Ulrich Drepper.
5246 * Optimized nearbyint and strcasecmp for PPC.
5247 Implemented by Adhemerval Zanella.
5249 * New locales: bho_IN, unm_US, es_CU, ta_LK
5253 * The following bugs are resolved with this release:
5255 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5256 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5257 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5258 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5259 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5260 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5261 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5262 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5263 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5264 12795, 12811, 12813, 12814, 12841
5266 * The RPC implementation in libc is obsoleted. Old programs keep working
5267 but new programs cannot be linked with the routines in libc anymore.
5268 Programs in need of RPC functionality must be linked against TI-RPC.
5269 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5271 Visible changes of this change include (obviously) the inability to link
5272 programs using RPC functions without referencing the TI-RPC library and the
5273 removal of the RPC headers from the glibc headers.
5274 Implemented by Ulrich Drepper.
5276 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5277 syncfs, setns, sendmmsg
5279 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5280 yue_HK, lij_IT, mhr_RU
5282 * New encodings: CP770, CP771, CP772, CP773, CP774
5284 * New program sotruss to trace calls through PLTs
5285 Implemented by Ulrich Drepper.
5287 * The malloc hook implementation is marked deprecated and will be removed
5288 from the default implementation in the next version. The design never
5289 worked ever since the introduction of threads. Even programs which do
5290 not create threads themselves can use multiple threads created internally.
5294 * The following bugs are resolved with this release:
5296 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5297 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5298 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5299 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5302 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5304 * POWER7 optimizations: memset, memcmp, strncmp
5306 * New optimized string functions for x86-64: strnlen (SSE2),
5307 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5308 Implemented by Ulrich Drepper.
5312 * The following bugs are resolved with this release:
5314 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5315 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5316 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5317 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5318 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5319 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5320 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5321 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5323 * New interfaces: pthread_getname_np, pthread_setname_np
5325 * New Linux interface: recvmmsg
5327 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5329 * The dynamic linker now recognizes supported ABI versions from the
5330 EI_ABIVERSION field in the ELF header.
5331 Implemented by Ulrich Drepper.
5333 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5334 will not be used to fill in password fields in the passwd.byname replies.
5335 Instead it is used to synthesize the shadow.byname table, should it be
5336 missing. This is a useful mode in some installations involving Solaris.
5337 Implemented by Ulrich Drepper.
5339 * New locales: kok_IN, sq_MK, cv_RU
5343 * The following bugs are resolved with this release:
5345 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5346 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5347 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5348 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5349 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5350 10789, 10817, 10823, 10840, 10847
5352 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5354 Implemented by Ulrich Drepper.
5356 * Checking version of longjmp added that fails if an uninitialized stack
5357 frame would be created. Implemented by Ulrich Drepper.
5359 * STT_GNU_IFUNC is now supported in static executables.
5360 Implemented by H.J. Lu.
5362 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5364 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5365 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5366 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5367 Contributed by H.J. Lu.
5369 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5370 Implemented by Ulrich Drepper.
5372 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5374 Contributed by H.J. Lu.
5376 * Support for fma instruction in AVX on x86-64.
5377 Implemented by H.J. Lu and Ulrich Drepper.
5379 * AVX support in x86-64 auditing support in ld.so.
5380 Implemented by H.J. Lu.
5382 * STB_GNU_UNIQUE support added.
5383 Implemented by Ulrich Drepper.
5385 * Implement second fallback mode for optimized DNS lookup for even more
5386 broken environments. If two requests from the same port are not
5387 handled correctly close the socket and open a new one before sending
5388 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5389 can be used to select this mode right away, instead of rediscovering the
5390 necessity is every process again.
5391 Implemented by Ulrich Drepper.
5393 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5394 Implemented by Adam Tkac.
5396 * Optimized iconv conversions for S390x.
5397 Implemented by Andreas Krebbel.
5399 * Using condvars with PI mutexes is now more efficient due to kernel
5400 support for requeueing to PI futexes. NPTL support added for x86-64.
5401 Implemented by Ulrich Drepper.
5403 * New locales: ps_AF, my_MM
5407 * The following bugs are resolved with this release:
5409 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5410 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5411 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5412 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5413 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5415 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5416 Implemented by Ulrich Drepper.
5418 * New Linux interfaces: accept4, fallocate, fallocate64.
5419 Implemented by Ulrich Drepper.
5421 * Correct declarations of string function when used in C++ code. This
5422 could lead to compile errors for invalid C++ code.
5424 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5427 * New POSIX 2008 interface: psiginfo
5428 Implemented by Ulrich Drepper.
5430 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5431 Implemented by Ulrich Drepper.
5433 * Support for selecting between multiple function definitions at runtime
5434 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5436 * The libcrypt library can now use the hash function implementations in
5437 NSS. Implemented by Ulrich Drepper.
5439 * The malloc implementation can be compiled to be less memory efficient
5440 but higher performing in multi-threaded programs.
5441 Implemented by Ulrich Drepper.
5443 * New locales: nan_TW@latin, ks_IN
5445 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5446 Implemented by Ulrich Drepper.
5448 * Extended printf hook support. It is possible to use user-defined types
5449 and extend existing format specifiers.
5450 Implemented by Ulrich Drepper.
5452 * Handling for group shadow files has been added.
5453 Implemented by Ulrich Drepper.
5455 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5456 servers (the case, e.g., for some people using the built-in DNS
5457 server in ADSL modems/routers). There is a once-per-process timeout
5458 in case of a broken server. To avoid it, users can run nscd or put
5459 'options single-request' in /etc/resolv.conf.
5460 Implemented by Ulrich Drepper.
5464 * The following bugs are resolved with this release:
5466 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5467 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5468 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5469 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5470 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5472 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5473 up at the same time. Implemented by Ulrich Drepper.
5475 * TLS descriptors for LD and GD on x86 and x86-64.
5476 Implemented by Alexandre Oliva.
5478 * getaddrinfo now handles DCCP and UDPlite.
5479 Implemented by Ulrich Drepper.
5481 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5482 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5483 Implemented by Ulrich Drepper.
5485 * New implementation of memmem, strstr, and strcasestr which is O(n).
5486 Implemented by Eric Blake.
5488 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5490 * Implement "e" option for popen to open file descriptor with the
5491 close-on-exec flag set. Implemented by Ulrich Drepper.
5493 * Implement "b" mode for fmemopen. In this mode writes writes don't
5494 implicitly add a NUL byte and seeks from the end of the buffer really
5495 use the buffer end, not the string length as the basis.
5496 Implemented by Ulrich Drepper.
5498 * Many functions, exported and internal, now atomically set the close-on-exec
5499 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5501 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5503 Implemented by Pravin Satpute.
5505 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5509 * The following bugs are resolved with this release:
5511 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5512 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5513 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5514 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5515 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5516 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5517 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5519 * New locales: bo_CN, bo_IN, shs_CA.
5521 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5523 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5524 Implemented by Pravin Satpute.
5526 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5528 * nscd caches now all timeouts for DNS entries
5529 Implemented by Ulrich Drepper.
5531 * nscd is more efficient and wakes up less often.
5532 Implemented by Ulrich Drepper.
5534 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5535 vdprintf, and obstack_vprintf.
5536 Implemented by Jakub Jelinek.
5538 * Faster memset for x86-64.
5539 Implemented by Harsha Jagasia and H.J. Lu.
5541 * Faster memcpy on x86.
5542 Implemented by Ulrich Drepper.
5544 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5545 Implemented by Ulrich Drepper.
5547 * Faster sqrt and sqrtf implemention for some PPC variants.
5548 Implemented by Steven Munroe.
5552 * The following bugs are resolved with this release:
5554 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5555 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5556 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5557 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5558 5071, 5103, 5104, 5112, 5113, 5184, 5186
5560 * More checking functions: fread, fread_unlocked, open*, mq_open.
5561 Implemented by Jakub Jelinek and Ulrich Drepper.
5563 * Extend fortification to C++. Implemented by Jakub Jelinek.
5565 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5566 by not recognizing 'a' as a modifier when those specs are requested.
5567 Implemented by Jakub Jelinek.
5569 * PPC optimizations to math and string functions.
5570 Implemented by Steven Munroe.
5572 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5573 options to be passed. Implemented by Ulrich Drepper.
5575 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5577 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5578 Implemented by Ulrich Drepper.
5580 * Handle private futexes in the NPTL implementation.
5581 Implemented by Jakub Jelinek and Ulrich Drepper.
5583 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5584 Implemented by Roland McGrath and Ulrich Drepper.
5586 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5588 * SHA-256 and SHA-512 based password encryption.
5589 Implemented by Ulrich Drepper.
5591 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5592 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5595 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5596 Implemented by Ulrich Drepper.
5600 * The following bugs are resolved with this release:
5602 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5603 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5604 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5605 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5606 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5607 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5608 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5611 * New Linux interfaces: epoll_pwait, sched_getcpu.
5613 * New generic interfaces: strerror_l.
5615 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5619 * The following bugs are resolved with this release:
5621 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5622 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5623 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5624 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5625 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5626 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5627 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5628 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5629 3225, 3251, 3252, 3253, 3273
5631 * For Linux, the sorting of addresses returned by getaddrinfo now also
5632 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5633 Implemented by Ulrich Drepper.
5635 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5636 Implemented by Ulrich Drepper.
5638 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5640 * New iconv module for MIK. Contributed by Alexander Shopov.
5642 * For sites with broken group and/or passwd database, the auto-propagate
5643 option of nscd can prevent creating ID lookup entries from the results
5644 of a name lookup and vice versa. This usually is no problem but some
5645 site might have problems with the default behavior.
5646 Implemented by Ulrich Drepper.
5648 * Iterating over entire database in NIS can be slow. With the
5649 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5650 to trade time for memory. The entire database will be read at once.
5651 Implemented by Ulrich Drepper.
5653 * The interfaces introduced in RFC 3542 have been implemented by
5656 * Support for the new ELF hash table format was added by Ulrich Drepper.
5658 * Support for priority inheritance mutexes added by Jakub Jelinek and
5661 * Support for priority protected mutexes added by Jakub Jelinek.
5663 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5664 or_IN, csb_PL, fy_NL, sr_ME.
5668 * More overflow detection functions.
5670 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5671 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5673 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5674 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5675 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5676 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5677 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5678 by Masahide Washizawa.
5680 * It is now possible to install audit libraries for the dynamic linker using
5681 LD_AUDIT. Implemented by Ulrich Drepper.
5683 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5684 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5685 For a libc and libpthread that works well on Linux 2.4 kernels, we
5686 recommend using the stable 2.3 branch.
5688 * The new function open_wmemstream acts like open_memstream,
5689 but uses a wchar_t wide character buffer.
5691 * The new function ppoll is an improved version of poll, similar to pselect.
5693 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5694 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5695 renameat, unlinkat, linkat, symlinkat, readlinkat.
5697 * New Linux kernel system calls: unshare,
5698 inotify_init, inotify_add_watch, inotify_rm_watch.
5700 * The euidaccess function is now also known by the alias eaccess,
5701 for compatibility with some other systems.
5703 * Timezone data updated to 2006b version.
5707 * The following bugs are resolved with this release:
5709 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5710 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5711 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5712 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5713 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5714 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5716 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5718 * As of this release, GCC 4 can be used to compile the C Library.
5720 * Timezone data updated to 2005m version.
5724 * The following bugs are resolved with this release:
5726 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5727 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5728 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5729 777, 787, 821, 822, 823, 825
5731 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5735 * Support for RFC 3678. Real implementations exist only for Linux so far.
5736 Implemented by Ulrich Drepper.
5738 * nscd can now cache entries persistently. Expiring entries are reloaded.
5739 For speedups the cache can be shared in memory with client processes.
5740 Implemented by Ulrich Drepper.
5742 * nscd can now perform SELinux checks.
5743 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5745 * getaddrinfo queries are now cached. Canonical name lookup is performed
5747 Implemented by Ulrich Drepper.
5749 * The nothrow function attribute is used when headers are used by gcc when
5750 compiling C code. This can avoid significant amounts of exception
5753 * The malloc functions perform more error checking and are stricter when
5754 it comes to reacting on errors. The default action is to terminate
5755 the process after showing an error message. Implemented by Ulrich Drepper.
5757 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5758 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5760 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5761 namespaces using the new function dlmopen(). This feature is of course,
5762 like most other dynamic loading functionality, not available in statically
5763 linked applications. Implemented by Ulrich Drepper.
5765 * Low-overhead boundary checking variants of string and some stdio functions
5766 were added. These are to be used in conjunction with a gcc patch by
5767 Jakub Jelinek which adds calls to these functions if possible.
5768 Implemented by Jakub Jelinek and Ulrich Drepper.
5770 * Old code for several operating systems and machine architectures that
5771 have not been in working condition in a long time have been removed from
5772 the main source tree maintained by the GNU C Library's maintainers.
5773 These files are now reside in the separate `ports' source module
5774 that is usable as an add-on when building the library.
5778 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5779 interrogate the dynamic linker, compatible with the Solaris interface.
5781 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5782 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5784 * getifaddrs now uses the netlink interface on Linux to get its information.
5785 Implemented by Thorsten Kukuk.
5787 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5788 Implemented by Ulrich Drepper.
5790 * support for non-executable stacks on x86 has been added. Changes mostly
5793 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5796 * getaddrinfo now performs destination address selection according to
5801 * Thread-safe interfaces for many functions that access locale data
5802 were added in version 2.3, but these features were omitted from NEWS.
5803 Many functions have variants with an `_l' suffix that take a `locale_t'
5804 object as a parameter rather than consulting the current locale.
5805 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5806 create and maintain `locale_t' objects. Additionally, the new function
5807 `uselocale' sets "the current locale" (as used by functions not so
5808 parameterized) set for an individual thread. These features were added
5809 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5811 * The functions getresuid, getresgid, setresuid, and setresgid, which
5812 have long been available on Linux, are now declared in <unistd.h>
5813 and are now also available on the Hurd.
5815 * ELF thread-local storage support (TLS) now works on x86-64.
5817 * The new dynamic string token $LIB is expanded in shared library names.
5818 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5820 * Aldy Hernandez contributed complete software floating point support for
5821 PowerPC machines with no FPU.
5823 * fexecve is implemented on Linux.
5825 * The `btowc' function should work at least twice as fast due to
5826 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5828 * With approriate thread add-ons cancelable functions are now implemented
5829 in libc.so as well. No need to call the function in libpthread. This
5830 change allowed to finally disable the incorrect and expensive handling
5831 of weak definition in ld.so.
5833 * Yet more PLT entries in libc.so have been removed. We finally arrived
5834 at the bare minimum. Startup times improved appropriately.
5836 * Support for the new Linux/x86 system call interface was added. The
5837 AT_SYSINFO auxiliary vector entry is recognized and handled.
5841 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5844 * iconv (the program and the interface) now accepts empty names (excluding
5845 options like //TRANSLIT) to mean "use charset of current locale".
5847 * localedef can now transliterate characters in strings which are not in
5848 the provided charmap. The information from the input locale is used.
5850 * Prelinking support was added for ELF targets. This requires additional
5851 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5853 * Read-only stdio streams now use mmap to speed up operation by eliminating
5854 copying and buffer underflows. To use add 'm' to the mode string of
5855 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5857 * The malloc functions were completely rewritten by Wolfram Gloger based
5858 on Doug Lea's malloc-2.7.0.c.
5860 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5861 implementation of regex.
5863 * Bruno Haible upgraded the iconv and locale implementation to support
5866 * Contents of the LC_* and LANG environment variables in the CEN style are
5867 not recognized anymore. It never was used. Change by Ulrich Drepper.
5869 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5870 thread-local storage (TLS) ABI on some platforms.
5871 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5873 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5874 EUC-JISX0213, and TSCII.
5876 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5877 BSD-compatible interface for getting all network interface addresses.
5878 Implementation for IPv4 by Roland McGrath.
5880 * Loading of locale data is faster due to the introduction of a locale
5881 archive. Implemented by Roland McGrath and Ulrich Drepper.
5883 * Startup times are significantly reduced by not using exported functions
5884 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5887 * Steven Munroe contributed a port to PowerPC64/Linux.
5891 * The Hurd now uses the GNU libio implementation of stdio rather than the
5892 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5894 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5895 with the same behavior as the Linux system call of the same name.
5899 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5900 128-bit long double format.
5902 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5903 IBM1161, and IBM1162 charsets.
5905 * Andreas Jaeger contributed a port to x86-64/Linux.
5907 * Peter Bruin contributed a port to PowerPC/Hurd.
5909 * libc functions using I/O streams now can handle wide-oriented streams
5912 * optimizations in the dynamic linker. Binaries created by recent binutils
5913 versions start up quicker due to reduced time spent on relocations.
5915 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5919 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5920 asinh, atanh, j0 for the 128-bit long double format.
5922 * Bruno Haible updated all the code handling Unicode in some form to
5923 support Unicode 3.1.
5925 * Speed of regex for single-byte locales is back to previous levels.
5926 Patch by Isamu Hasegawa.
5928 * Alpha, SPARC, and IA-64 now also using floating stacks.
5930 * Startup time of internationalized applications greatly improved through
5931 iconv cache. Use iconvconfig to generate the cache file.
5932 Contributed by Ulrich Drepper.
5934 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5935 severe performance problems. Patch by David Mosberger.
5937 * The Hurd port got a lot more functionality like AIO, various stdio
5938 extensions, etc. Mainly done by Roland McGrath.
5940 * mtrace can now lookup symbols in shared libraries.
5944 * Intel's IA-64 math library is largely integrated. It provides fast and
5945 accurate implementatations for most basic and standard math functions
5946 in float, double, and long double format.
5948 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5949 and asin for the 96-bit long double format and asin, log, tan for the
5950 128-bit long double format.
5952 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5953 The basic double functions exist today. Contributed by Abraham Ziv
5954 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5955 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5957 * An asynchronous name lookup library was added. The interface is designed
5958 after POSIX AIO. The proposal was circulated beforehand to get comments.
5959 No negative ones came in. Implemented by Ulrich Drepper.
5961 * Port to S390/64bit contributed by Martin Schwidefsky
5962 <schwidefsky@de.ibm.com>.
5964 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5965 of functions for Linux/IA-64.
5967 * The RPC code is now thread safe. Threads can now use the same service
5968 of different services at the same time. Patch by Eric Norum
5969 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5971 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5972 family of functions for Linux/S390.
5974 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5975 of functions for Linux/x86.
5977 * Port to Linux/CRIS contributed by Axis Communications.
5981 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5982 we can now check for namespace violations and missing declarations. The
5983 result is that almost all headers are now Unix-compliant (as defined in
5984 the upcoming XPG6). The negative side is that some programs might need
5985 corrections, too, if they depend on the incorrect form of the headers in
5986 previous versions which defined too many symbols and included too many
5989 * regex now handles multibyte character sets correctly.
5990 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5992 * iconv (the program) does now conform to the upcoming XPG6 and handles
5993 charmaps. Instead of the charset names the path of charmaps can be
5994 provided and the conversion happens based on this data.
5995 Contributed by Ulrich Drepper.
5997 * The locale program now provides detailed information about the installed
6002 only lists the names of the supported locales
6006 provides details such as country, language, and codeset name.
6007 Contributed by Ulrich Drepper.
6011 * The gencat program now parses the input file according to the charset
6012 selected by the LC_CTYPE category. This is important for stateful
6013 character sets. To make generating catalogs easier there is a way
6014 to overwrite the charset selected by the locale: before the first
6015 message or $ quote line the catalog can contain a line like
6017 $ codeset=ISO-8859-2
6019 to select the charset (ISO-8859-2 in this case).
6021 Implemented by Shinya Hanataka and Ulrich Drepper.
6023 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6024 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6025 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6027 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6028 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6030 * The LANGUAGE environment variable is now ignored unless the locale is
6031 changed from the default "C" locale.
6033 * The usual bug fixes.
6037 * Greg McGary added runtime support for bounds checking using gcc's
6038 new -fbounded-pointers option. ix86 target is complete. PowerPC
6041 * Thorsten Kukuk added secure mode support to nscd.
6043 * The Berkeley db libraries have been removed.
6045 Related, the nss_db module is now in a separate package since it
6046 obviously requires a database library being available.
6048 * Wide character I/O streams implemented by Ulrich Drepper.
6050 * Functions from the extended socket API added by Ulrich Drepper.
6052 * Functions feenableexcept and fedisableexcept to control the
6053 behaviour of individual exceptions have been added by Andreas Jaeger.
6055 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6057 * The resolver code has been updated from bind 8.2.3-T5B which supports
6058 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6061 This change could in some situations effect backward compatibility. Since
6062 now `_res' is a thread-local instead of a global variable, modifying it
6063 in one thread does not have any effect in other threads.
6065 The resolver library was also extended to allow IPv6 as the transport
6066 protocol for the requests. This work was done by Stig Venaas.
6068 * Compatibility code for K&R C compilers has been removed from the
6069 header files. A ISO C compiler is needed to use the library
6070 (conforming to either C89 or C99 standard).
6072 * Complete rewrite of the localedef program to support multibyte character
6073 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6074 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6075 Implemented by Ulrich Drepper.
6077 Bruno Haible significantly improved the generation and use of the data
6078 structures for the wide character tables.
6080 * Plural handling in gettext implemented by Ulrich Drepper.
6082 * The utmp daemon has been removed.
6084 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6086 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6089 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6091 * POSIX barriers implemented by Kaz Kylheku.
6093 * POSIX spawn function family implemented by Ulrich Drepper.
6095 * POSIX spinlocks are now available.
6097 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6099 * the configure option --enable-kernel=X.Y.Z allows to strip out
6100 compatibility for kernel versions before X.Y.Z. This is currently only
6101 implemented for Linux.
6103 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6104 field sin6_scope_id. This means that all programs using IPv6 should be
6105 recompiled. Don't expect binary compatibility with previous glibc
6108 * various conversion modules for IBM character sets contributed by
6111 * IA-64 port by Jes Sorensen and HJ Lu.
6125 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6127 * New xdr functions are added; some rpc functions are now 64bit clean.
6129 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6131 * Fixed known incompatibilities with glibc 2.0.
6133 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6135 * Optimized a number of functions (especially the ELF dynamic loader).
6137 * Update timezone data files.
6139 * lots of charmaps corrections
6141 * some new locale definitions and charmaps
6146 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6147 conform to POSIX member type requirements. Symbol versions have been
6148 adjusted as needed within the library, and for direct use by applications,
6149 but there is potential for problems if third-party libraries use
6150 struct timeval as part of their interface. This does not present
6151 a problem for X and other "essential" system libraries.
6153 * An additional locale model to support C++ Standard Library locale
6154 model and probably more was implemented by Ulrich Drepper.
6156 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6159 * Miles Bader provided the `argp' function family to support hierachical
6160 command line argument parsing, layered on top of getopt.
6162 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6164 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6167 * scanf recognizes the %a and %A format for scanning floating point numbers.
6169 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6170 information and interfaces for the available integer types.
6172 * about 130 new math functions were added to implement the ISO C9x math
6175 * the new header <complex.h> contains definitions of the complex math
6176 functions from ISO C 9X.
6178 * the new header <tgmath.h> defines generic macros to use complex or
6179 real valued functions.
6181 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6183 * Andreas Jaeger provided a test suite for the math library.
6185 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6187 * Ulrich Drepper added character set conversion functions (iconv).
6189 * Optimized string functions have been added.
6191 * The localedata addon is now part of glibc.
6193 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6195 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6196 daemon for NSS (nscd).
6198 Missing a better place here are some numbers on improvements. Under
6199 Linux 2.1.125 un-tar-ing the kernel sources takes
6203 using local files 12.19s 6.88s 22.91s
6205 using NIS 13.92s 8.91s 26.34s
6207 using NIS & nscd 10.37s 7.34s 25.30s
6209 using NIS+ 27.57s 30.37s 640.46s
6211 using NIS+ & nscd 10.25s 7.83s 26.51s
6213 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6215 Keep in mind that non-namelookup related operations dominate above times.
6216 It was just a common complain that using NIS+ unpacking the kernel is
6219 [1] The old nscd implementation is not available anymore since it was
6220 distributed with glibc up to version 2.0.98 and thus is now replaced.
6222 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6224 * Mark Kettenis provided a Hesiod NSS module.
6226 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6227 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6229 * rcmd can now handle netgroups (Dick Streefland).
6231 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6234 * Support for the IPv6 protocol has been added to the socket API, as per the
6235 latest draft standards.
6237 * Support for Linux 2.2 has been added.
6239 * Interface changes relative to the latest 2.0.x release:
6240 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6241 addseverity NEW: Unix98
6242 alphasort64 NEW: LFS
6243 argp_err_exit_status NEW: argp, GNU ext
6244 argp_error NEW: argp, GNU ext
6245 argp_failure NEW: argp, GNU ext
6246 argp_help NEW: argp, GNU ext
6247 argp_parse NEW: argp, GNU ext
6248 argp_program_bug_address NEW: argp, GNU ext
6249 argp_program_version NEW: argp, GNU ext
6250 argp_program_version_hook NEW: argp, GNU ext
6251 argp_state_help NEW: argp, GNU ext
6252 argp_usage NEW: argp, GNU ext
6253 authdes_create NEW: Secure RPC
6254 authdes_getucred NEW: Secure RPC
6255 authdes_pk_create NEW: Secure RPC
6256 backtrace NEW: GNU ext.
6257 backtrace_symbols NEW: GNU ext.
6258 backtrace_symbols_fd NEW: GNU ext.
6260 cacosf NEW: ISO C 9x
6261 cacosh NEW: ISO C 9x
6262 cacoshf NEW: ISO C 9x
6263 cacoshl NEW: ISO C 9x
6264 cacosl NEW: ISO C 9x
6271 casinf NEW: ISO C 9x
6272 casinh NEW: ISO C 9x
6273 casinhf NEW: ISO C 9x
6274 casinhl NEW: ISO C 9x
6275 casinl NEW: ISO C 9x
6277 catanf NEW: ISO C 9x
6278 catanh NEW: ISO C 9x
6279 catanhf NEW: ISO C 9x
6280 catanhl NEW: ISO C 9x
6281 catanl NEW: ISO C 9x
6282 cbc_crypt NEW: Secure RPC
6286 ccoshf NEW: ISO C 9x
6287 ccoshl NEW: ISO C 9x
6293 cimagf NEW: ISO C 9x
6294 cimagl NEW: ISO C 9x
6295 clearerr_locked REMOVED
6296 clntunix_create NEW: sunrpc ext
6298 clog10 NEW: ISO C 9x
6299 clog10f NEW: ISO C 9x
6300 clog10l NEW: ISO C 9x
6310 cprojf NEW: ISO C 9x
6311 cprojl NEW: ISO C 9x
6313 crealf NEW: ISO C 9x
6314 creall NEW: ISO C 9x
6319 csinhf NEW: ISO C 9x
6320 csinhl NEW: ISO C 9x
6323 csqrtf NEW: ISO C 9x
6324 csqrtl NEW: ISO C 9x
6328 ctanhf NEW: ISO C 9x
6329 ctanhl NEW: ISO C 9x
6331 des_setparity NEW: Secure RPC
6332 ecb_crypt NEW: Secure RPC
6333 endutxent NEW: Unix98
6335 exp10f NEW: ISO C 9x
6336 exp10l NEW: ISO C 9x
6340 fattach NEW: STREAMS
6341 fdetach NEW: STREAMS
6345 feclearexcept NEW: ISO C 9x
6346 fegetenv NEW: ISO C 9x
6347 fegetexceptflag NEW: ISO C 9x
6348 fegetround NEW: ISO C 9x
6349 feholdexcept NEW: ISO C 9x
6351 feraiseexcept NEW: ISO C 9x
6352 ferror_locked REMOVED
6353 fesetenv NEW: ISO C 9x
6354 fesetexceptflag NEW: ISO C 9x
6355 fesetround NEW: ISO C 9x
6356 fetestexcept NEW: ISO C 9x
6357 feupdateenv NEW: ISO C 9x
6358 fflush_locked REMOVED
6362 fgets_unlocked NEW: GNU ext.
6363 fileno_locked REMOVED
6375 fputc_locked REMOVED
6376 fputs_unlocked NEW: GNU ext.
6377 fread_unlocked NEW: GNU ext.
6382 fstatvfs NEW: Unix98
6386 ftruncate64 NEW: LFS
6388 fwrite_unlocked NEW: GNU ext.
6389 gai_strerror NEW: IPv6
6393 getchar_locked REMOVED
6395 getdate_err NEW: Unix98
6396 getdate_r NEW: GNU ext.
6398 getnameinfo NEW: IPv6
6399 getnetname NEW: Secure RPC
6400 getpmsg NEW: STREAMS
6401 getpt NEW: Unix98 PTY
6402 getrlimit64 NEW: LFS
6403 getutxent NEW: Unix98
6404 getutxid NEW: Unix98
6405 getutxline NEW: Unix98
6406 glob64 NEW: GNU ext.
6407 globfree64 NEW: GNU ext.
6408 gnu_get_libc_release NEW: GNU ext.
6409 gnu_get_libc_version NEW: GNU ext.
6410 grantpt NEW: Unix98 PTY
6411 host2netname NEW: Secure RPC
6413 iconv_close NEW: iconv
6414 iconv_open NEW: iconv
6415 if_freenameindex NEW: IPv6
6416 if_indextoname NEW: IPv6
6417 if_nameindex NEW: IPv6
6418 if_nametoindex NEW: IPv6
6419 in6addr_any NEW: IPv6
6420 in6addr_loopback NEW: IPv6
6421 inet6_isipv4mapped NEW: IPv6
6422 isastream NEW: STREAMS
6423 iswblank NEW: GNU ext.
6424 key_decryptsession NEW: Secure RPC
6425 key_decryptsession_pk NEW: Secure RPC
6426 key_encryptsession NEW: Secure RPC
6427 key_encryptsession_pk NEW: Secure RPC
6428 key_gendes NEW: Secure RPC
6429 key_get_conv NEW: Secure RPC
6430 key_secretkey_is_set NEW: Secure RPC
6431 key_setnet NEW: Secure RPC
6432 key_setsecret NEW: Secure RPC
6433 llrint NEW: ISO C 9x
6434 llrintf NEW: ISO C 9x
6435 llrintl NEW: ISO C 9x
6436 llround NEW: ISO C 9x
6437 llroundf NEW: ISO C 9x
6438 llroundl NEW: ISO C 9x
6443 lrintf NEW: ISO C 9x
6444 lrintl NEW: ISO C 9x
6445 lround NEW: ISO C 9x
6446 lroundf NEW: ISO C 9x
6447 lroundl NEW: ISO C 9x
6449 makecontext NEW: Unix98
6450 mempcpy NEW: GNU ext.
6453 modify_ldt NEW: kernel
6457 nearbyint NEW: ISO C 9x
6458 nearbyintf NEW: ISO C 9x
6459 nearbyintl NEW: ISO C 9x
6460 netname2host NEW: Secure RPC
6461 netname2user NEW: Secure RPC
6462 nexttoward NEW: ISO C 9x
6463 nexttowardf NEW: ISO C 9x
6464 nexttowardl NEW: ISO C 9x
6468 passwd2des NEW: Secure RPC
6470 pow10f NEW: GNU ext.
6471 pow10l NEW: GNU ext.
6474 printf_size NEW: GNU ext.
6475 printf_size_info NEW: GNU ext.
6476 profil_counter REMOVED
6477 pthread_mutexattr_getkind_np REPLACED
6478 pthread_mutexattr_setkind_np REPLACED
6479 ptsname NEW: Unix98 PTY
6480 ptsname_r NEW: Unix98 PTY
6482 putchar_locked REMOVED
6483 putgrent NEW: GNU ext.
6485 putpmsg NEW: STREAMS
6486 pututxline NEW: Unix98
6490 readdir64_r NEW: LFS
6491 remquo NEW: ISO C 9x
6492 remquof NEW: ISO C 9x
6493 remquol NEW: ISO C 9x
6495 roundf NEW: ISO C 9x
6496 roundl NEW: ISO C 9x
6498 scalbln NEW: ISO C 9x
6499 scalblnf NEW: ISO C 9x
6500 scalblnl NEW: ISO C 9x
6502 sendfile NEW: kernel
6503 setcontext NEW: Unix98
6504 setrlimit64 NEW: LFS
6505 setutxent NEW: Unix98
6507 sigignore NEW: Unix98
6508 sigqueue NEW: POSIX.1b
6509 sigrelse NEW: Unix98
6510 sigset NEW: POSIX.1b
6511 sigtimedwait NEW: POSIX.1b
6512 sigwaitinfo NEW: POSIX.1b
6513 sincos NEW: GNU ext.
6514 sincosf NEW: GNU ext.
6515 sincosl NEW: GNU ext.
6519 strcasestr NEW: GNU ext.
6520 strtoimax NEW: ISO C 9x
6521 strtoumax NEW: ISO C 9x
6522 strverscmp NEW: GNU ext.
6523 svcauthdes_stats NEW: Secure RPC
6524 svcunix_create NEW: sunrpc etx
6525 svcunixfd_create NEW: sunrpc ext
6526 swapcontext NEW: Unix98
6527 tcgetsid NEW: Unix98 PTY
6528 tdestroy NEW: GNU ext.
6529 tgamma NEW: ISO C 9x
6530 tgammaf NEW: ISO C 9x
6531 tgammal NEW: ISO C 9x
6535 truncf NEW: ISO C 9x
6536 truncl NEW: ISO C 9x
6538 unlockpt NEW: Unix98 PTY
6539 updwtmpx NEW: Unix98
6540 user2netname NEW: Secure RPC
6541 utmpxname NEW: Unix98
6542 versionsort NEW: GNU ext.
6543 versionsort64 NEW: GNU ext.
6545 wcscasecmp NEW: GNU ext.
6546 wcsncasecmp NEW: GNU ext.
6547 wcsnlen NEW: GNU ext.
6548 wcstoimax NEW: ISO C 9x
6549 wcstoll NEW: ISO C 9x
6550 wcstoull NEW: ISO C 9x
6551 wcstoumax NEW: ISO C 9x
6553 wordexp NEW: POSIX.2
6554 wordfree NEW: POSIX.2
6555 write_profiling REMOVED
6556 xdecrypt NEW: Secure RPC
6557 xdr_authdes_cred NEW: Secure RPC
6558 xdr_authdes_verf NEW: Secure RPC
6559 xdr_cryptkeyarg NEW: Secure RPC
6560 xdr_cryptkeyarg2 NEW: Secure RPC
6561 xdr_cryptkeyres NEW: Secure RPC
6562 xdr_getcredres NEW: Secure RPC
6563 xdr_key_netstarg NEW: Secure RPC
6564 xdr_key_netstres NEW: Secure RPC
6565 xdr_keybuf NEW: Secure RPC
6566 xdr_keystatus NEW: Secure RPC
6567 xdr_netnamestr NEW: Secure RPC
6568 xdr_sizeof NEW: Secure RPC
6569 xdr_unixcred NEW: sunrpc ext
6570 xencrypt NEW: Secure RPC
6571 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6582 * inet_ntoa is thread-safe
6584 * updwtmp is moved from libutil to libc
6586 * rewrite of cbrt function
6588 * update of timezone data
6602 * add atoll function
6604 * fix complex problems in Berkeley DB code
6606 * fix math functions
6610 * fixed lots of header problems (especially Linux/GNU specific)
6612 * dynamic loader preserves all registers
6614 * Roland McGrath provided support for handling of auxiliary objects in
6615 the ELF dynamic loader.
6617 * support for parallel builds is improved
6621 * GNU extensions are no longer declared by default. To enable them you
6622 must define the macro `_GNU_SOURCE' in your program or compile with
6625 * The library has changed from using GNU ld symbol aliases to using weak
6626 symbols where available. The ELF object file format supports weak
6627 symbols; GNU ld also supports weak symbols in the a.out format. (There
6628 is also now support for other GNU ld extensions in ELF. Use the
6629 `--with-elf' option to configure to indicate you have ELF, and
6630 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6631 of many files which contained only symbol aliases, reducing the size of
6632 the source and the compiled library; many other files were renamed to
6633 less cryptic names previously occupied by the symbol alias files.
6634 There is a new header file <elf.h> for programs which operate on
6635 files in the ELF format.
6637 * Converted to Autoconf version 2, so `configure' has more options.
6638 Run `configure --help' to see the details.
6640 * The library can now be configured to build profiling, highly-optimized
6641 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6642 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6643 `configure' enable building these extra libraries. The shared library is
6644 built by default when using both ELF and GNU ld. When shared libraries
6645 are enabled, the new library `-ldl' is available for arbitrary run-time
6646 loading of shared objects; its interface is defined in <dlfcn.h>. The
6647 new header file <link.h> gives access to the internals of the run-time
6648 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6649 application of same name on other systems and it provides information
6650 about dynamically linked binaries.
6652 * The C library now provides the run-time support code for profiling
6653 executables compiled with `-pg'. Programs can control the profiling code
6654 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6655 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6656 the support for this file format was contributed by David Mosberger-Tang.
6658 * The math code has been replaced with a math library based on fdlibm from
6659 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6660 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6661 functions. The math functions now reside in a separate library, so
6662 programs using them will need to use `-lm' their linking commands.
6664 * John C. Bowman contributed optimized ix87 assembler inline functions.
6666 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6667 mechanism similar to that found in Solaris 2. This is now used for the
6668 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6669 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6670 file controls what services are used for each individual database. This
6671 works by loading shared libraries with names specified in `nsswitch.conf',
6672 so service modules can be changed or added at any time without even
6673 relinking any program. Currently there are the file, db, and NIS based
6674 NSS services available.
6676 * The new functions `strtoq' and `strtouq' parse integer values from
6677 strings, like `strtol' and `strtoul', but they return `long long int' and
6678 `unsigned long long int' values, respectively (64-bit quantities).
6680 * The new functions `strtof' and `strtold' parse floating-point values from
6681 strings, like `strtod', but they return `float' and `long double' values,
6682 respectively (on some machines `double' and `long double' are the same).
6684 * Ulrich Drepper has contributed new implementations of the floating-point
6685 printing and reading code used in the `printf' family of functions and
6686 `strtod', `strtof', and `strtold'. These new functions are perfectly
6687 accurate, and much faster than the old ones.
6689 * The implementation of the POSIX locale model was completely rewritten by
6690 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6691 to compile the POSIX locale definition.
6693 * The former dummy implementations of the strcoll and strxfrm function are
6694 now replaced by fully functional code contributed by Ulrich Drepper. The
6695 collation information comes from the POSIX locale definitions.
6697 * The new header <langinfo.h> defines an interface for accessing
6698 various locale-dependent data (using the locale chosen with `setlocale').
6700 * Ulrich Drepper has contributed a new suite of functions for operation on
6701 wide-character and multibyte-character strings, in <wchar.h>;
6702 and classification and case conversion of wide characters, in <wctype.h>.
6703 These new functions are conforming to the ISO C, Amendement 1 specification.
6705 * There is now a second implementation of the standard I/O library available.
6706 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6707 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6709 * You can now use positional parameter specifications in format strings
6710 for the `printf' and `scanf' families of functions. For example,
6711 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6712 ``Number 6, Mr Jones''. This is mainly useful when providing different
6713 format strings for different languages, whose grammars may dictate
6714 different orderings of the values being printed. To support this
6715 feature, the interface for `register_printf_handler' has changed; see
6716 the header file <printf.h> for details.
6718 * The `printf' and `scanf' families of functions now understand a new
6719 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6720 to group numbers as indicated by the locale; for `scanf' and friends, this
6721 says to accept as valid only a number with all the proper grouping
6722 separators in the right places. In the default "C" locale, numbers are
6723 not grouped; but locales for specific countries will define the usual
6724 conventions (i.e. separate thousands with `,' in the US locale).
6726 * The pgrp functions have been regularized, slightly incompatibly but much
6727 less confusingly. The core functions are now `getpgid' and `setpgid',
6728 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6729 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6730 provided for compatibility. There is no longer an incompatible `getpgrp'
6731 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6733 * The new header file <fts.h> and suite of functions simplify programs that
6734 operate on directory trees. This code comes from 4.4 BSD.
6736 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6737 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6738 NSS scheme used in glibc.
6740 * There is a new malloc debugging hook `__memalign_hook'.
6742 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6743 `unsigned int' in <sys/types.h>. These are for compatibility only and
6744 their use is discouraged.
6746 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6747 done differently, so that it works even without GNU ld.
6749 * New function `euidaccess' checks allowed access to a file like `access',
6750 but using the effective IDs instead of the real IDs.
6752 * The time zone data files have been updated for the latest and greatest
6753 local time conventions of the countries of the world.
6755 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6758 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6759 for formatting floating-point numbers. They are provided only for
6760 compatibility; new programs should use `sprintf' instead. There are
6761 also equivalent function for the `long double' floating-point type and
6762 all functions also exist in a reentrant form.
6764 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6765 functions for maintaining the login-record files (primarily of use to
6766 system programs such as `login'), and convenient functions for
6767 allocating and initializing a pseudo-terminal (pty) device.
6769 * Ulrich Drepper has contributed new support for System V style
6770 shared memory and IPC on systems that support it.
6772 * Ulrich Drepper has contributed several miscellaneous new functions found
6773 in System V: The `hsearch' family of functions provide an effective
6774 implementation of hash tables; `a64l' and `l64a' provide a very simple
6775 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6778 * Ulrich Drepper has contributed new reentrant counterparts for the
6779 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6781 * Ulrich Drepper has contributed new, highly-optimized versions of several
6782 string functions for the i486/Pentium family of processors.
6784 * Ulrich Drepper has updated the Linux-specific code, based largely
6785 on work done in Hongjiu Lu's version of GNU libc for Linux.
6786 The GNU library now supports Linux versions 2.0.10 and later,
6787 using the ELF object file format (i[3456]86-*-linux).
6789 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6791 * David Mosberger-Tang and Richard Henderson have ported the C library
6792 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6793 dynamic linking support for ELF/Alpha.
6795 * Richard Henderson contributed several Alpha optimized assembler function
6796 for arithmetic and string handling.
6798 * Ulrich Drepper has contributed a new set of message catalog functions to
6799 support multiple languages using the <libintl.h> interface, for use with
6800 his new package GNU gettext. Translation volunteers have contributed
6801 catalogs of the library's messages in Spanish, German, and Korean.
6803 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6804 program and the `catgets' function for reading the catalog files it
6805 creates. (The <libintl.h> interface is preferred; we include the
6806 <nl_types.h> interface using `catgets' only for source compatibility with
6807 programs already written to use it.)
6809 * New header file <values.h> gives SVID-compatible names for <limits.h>
6812 * Various new macros, declarations, and small header files for compatibility
6815 * New function `group_member' is a convenient way to check if a process has
6816 a given effective group ID.
6818 * When using GCC 2.7 and later, the socket functions are now declared in a
6819 special way so that passing an argument of type `struct sockaddr_in *',
6820 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6821 `struct sockaddr *' type, does not generate a type-clash warning.
6823 * New function `error' declared in header file <error.h> is a convenient
6824 function for printing error messages and optionally exiting; this is the
6825 canonical function used in GNU programs. The new functions `err', `warn',
6826 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6827 doing the same thing.
6829 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6830 POSIX.2 `glob' function to do ~ and {...} expansion.
6832 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6833 `clearenv' which is used in POSIX.9 is also available.
6835 * New function `getsid' returns session ID number on systems that support it.
6837 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6838 files <db.h> and <mpool.h> provide a rich set of functions for several
6839 types of simple databases stored in memory and in files, and <ndbm.h> is
6840 an old `ndbm'-compatible interface using the `db' functions. Link with
6841 `-ldb' to get these functions.
6843 * New macro `strdupa' copies a string like `strdup', but uses local stack
6844 space from `alloca' instead of dynamic heap space from `malloc'.
6846 * New function `strnlen' is like `strlen' but searches only a given maximum
6847 number of characters for the null terminator. `stpncpy', `strndup' and
6848 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6851 * New function `statfs' in header <sys/statfs.h>.
6853 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6854 provide convenient functions for operating on blocks of null-terminated
6857 * A new suite of functions in <utmp.h> handle all the details of reading
6858 and writing the utmp file.
6860 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6863 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6864 completely POSIX compliant and also implemented the extended functionality
6865 to handle alternate digit representation and alternate era date formats.
6867 * Ulrich Drepper provided an implementation of the `strptime' function
6868 defined in XPG4.2 which transforms a string into a `struct tm' value.
6870 * Paul Eggert provided the tzselect shell script as part of the timezone
6871 code. The shell script makes it easy to select the correct timezone
6874 * The implementation of the malloc family of functions is completely replaced
6875 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6876 The implementation uses the mmap function (if available) and it is
6877 optimized for the use in multi threaded programs.
6879 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6880 functions. This new functionality is usable by specifying a special
6881 salt string and it is compatible with implementation on *BSD systems.
6883 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6884 `getsubopt' to handle second level command line options, `bsd_signal'
6885 to access BSD style `signal' functionality, the obsolete `regexp' style
6888 * the `lchown' function is available on system which support this
6891 * The implementation of the shadow password handling function was contributed
6894 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6896 * POSIX.1g support was added. The <sys/select.h> header is available,
6897 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6898 implementation of `getaddrinfo'.
6902 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6904 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6905 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6907 * The new function `daemon' from 4.4 BSD is useful for server programs that
6908 want to put themselves in the background.
6910 * Joel Sherrill has contributed support for several standalone boards that
6911 run without an operating system.
6913 * `printf', `scanf' and friends now accept a `q' type modifier for long
6914 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6916 * All of the code taken from BSD (notably most of the math and networking
6917 routines) has been updated from the BSD 4.4-Lite release.
6919 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6921 * The new functions `getdomainname' and `setdomainname' fetch or change the
6922 YP/NIS domain name. These are system calls which exist on systems which
6925 * The time zone data files have been updated for the latest international
6928 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6929 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6933 * The C library now includes support for Sun RPC, from Sun's free
6934 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6935 are included. (There is still no support for YP.)
6937 * Tom Quinn has contributed a port of the C library to SGI machines running
6938 Irix 4 (mips-sgi-irix4).
6940 * The new `lockf' function is a simplified interface to the locking
6941 facilities of `fcntl', included for compatibility.
6943 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6945 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6947 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6950 * The error message printed by `assert' for a failed assertion now includes
6951 the name of the program (if using GNU ld) and the name of the calling
6952 function (with versions of GCC that support this).
6954 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6956 * The library now includes the <sys/mman.h> header file and memory
6957 management functions `mmap', `munmap', `mprotect', `msync', and
6958 `madvise', on systems that support those facilities.
6960 * The interface for `mcheck' has changed slightly: the function called to
6961 abort the program when an allocation inconsistency is detected now takes
6962 an argument that indicates the type of failure. The new function
6963 `mprobe' lets you request a consistency check for a particular block at
6964 any time (checks are normally done only when you call `free' or `realloc'
6967 * It is now possible to easily cross-compile the C library, building on one
6968 system a library to run on another machine and/or operating system. All
6969 you need to do is set the variable `HOST_CC' in `configparms' to the
6970 native compiler for programs to run on the machine you are building on (a
6971 few generator programs are used on Unix systems); set `CC' to the
6974 * The new function `fexecve' (only implemented on the GNU system) executes
6975 a program file given a file descriptor already open on the file.
6979 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6980 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6982 * You can set the variable `libprefix' in `configparms' to specify a prefix
6983 to be prepended to installed library files; this makes it easy to install
6984 the GNU C library to be linked as `-lgnuc' or whatever.
6986 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6987 copies a limited number of characters from a string, and returns the
6988 address of the last character written.
6990 * You no longer need to check for whether the installed `stddef.h' is
6991 compatible with the GNU C library. configure now checks for you.
6993 * You can now define a per-stream `fileno' function to convert the
6994 stream's cookie into an integral file descriptor.
6996 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6997 allocates zero bytes of storage, and returns a unique pointer which
6998 you can pass to `realloc' or `free'. The behavior is undefined if
6999 you dereference this pointer.
7001 * The C library now runs on Sony NEWS m68k machines running either
7002 NewsOS 3 or NewsOS 4.
7004 * The new `syscall' function is a system-dependent primitive function
7005 for invoking system calls. It has the canonical behavior on Unix
7006 systems, including unreliable return values for some calls (such as
7007 `pipe', `fork' and `getppid').
7009 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7010 to `EAGAIN', which is the preferred name. On systems whose kernels
7011 use two distinct codes, the C library now translates EWOULDBLOCK to
7012 EAGAIN in every system call function.
7016 * The GNU C Library Reference Manual is now distributed with the library.
7017 `make dvi' will produce a DVI file of the printed manual.
7018 `make info' will produce Info files that you can read on line using C-h i
7019 in Emacs or the `info' program.
7020 Please send comments on the manual to bug-glibc-manual@gnu.org.
7022 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7024 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7026 * Jason Merrill has contributed a port to the Sequent Symmetry running
7027 Dynix version 3 (i386-sequent-dynix).
7029 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7030 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7032 * New function `memory_warnings' lets you arrange to get warnings when
7033 malloc is running out of memory to allocate, like Emacs gives you.
7035 * The C library now contains the relocating allocator used in Emacs 19 for
7036 its editing buffers. This allocator (ralloc) minimizes allocation
7037 overhead and fragmentation by moving allocated regions around whenever it
7038 needs to. You always refer to a ralloc'd region with a "handle" (a
7039 pointer to a pointer--an object of type `void **').
7041 * There is a new `printf' format: `%m' gives you the string corresponding
7042 to the error code in `errno'.
7044 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7045 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7046 pass, the `a' modifier says to fill in a `char **' you pass with a
7049 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7050 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7051 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7053 * `mkstemp' is a traditional Unix function to atomically create and open a
7054 uniquely-named temporary file.
7058 * The standard location for the file that says what the local timezone is
7059 has changed again. It is now `/usr/local/etc/localtime' (or more
7060 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7062 * The distribution no longer contains any files with names longer than 14
7065 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7066 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7068 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7072 * The configuration process has changed quite a bit. The `configure'
7073 script is now used just like the configuration scripts for other GNU
7074 packages. The `sysdeps' directory hierarchy is much rearranged.
7075 The file `INSTALL' explains the new scheme in detail.
7077 * The header files no longer need to be processed into ANSI C and
7078 traditional C versions. There is just one set of files to install, and
7079 it will work with ANSI or old C compilers (including `gcc -traditional').
7081 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7082 MIPS DECStation running Ultrix 4.
7084 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7085 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7086 made itself into a shared library.
7088 * Yet further improved support for the i386, running 4.3 BSD-like systems
7089 (such as Mach 3 with the Unix single-server), or System V.
7091 * New function `strncasecmp' to do case-insensitive string comparison
7092 with limited length.
7094 * New function `strsep' is a reentrant alternative to `strtok'.
7096 * New functions `scandir' and `alphasort' for searching directories.
7098 * New function `setenv' is a better interface to `putenv'.
7100 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7101 function for traversing a directory tree.
7103 * The GNU obstack package is now also part of the C library.
7104 The new function `open_obstack_stream' creates a stdio stream that
7105 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7106 formatted output directly to an obstack.
7108 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7109 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7111 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7113 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7114 things to your strings.
7116 * There are some new test programs: test-fseek, testmb, and testrand.
7118 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7119 These ports are not finished, but are a good starting place for really
7120 supporting those systems.
7122 * `/etc/localtime' is now the standard location for the file that says what
7123 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7124 This follows the general principle that `/etc' is the place for all local
7125 configuration files.
7127 * The C library header files now use `extern "C"' when used by the C++
7128 compiler, so the C library should now work with C++ code.
7130 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7131 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7134 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7135 function which uses the `merge sort' algorithm, and is said to be
7136 significantly faster than the old GNU `qsort' function. Merge sort is
7137 now the standard `qsort' function. The new algorithm can require a lot
7138 of temporary storage; so, the old sorting function is called when the
7139 required storage is not available.
7141 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7142 provides the Unix `crypt' function, plus some other entry points.
7144 * The code and header files taken from 4.4 BSD have been updated with the
7145 latest files released from Berkeley.
7147 ----------------------------------------------------------------------
7150 Permission is granted to anyone to make or distribute verbatim copies
7151 of this document as received, in any medium, provided that the
7152 copyright notice and this permission notice are preserved,
7153 thus giving the recipient permission to redistribute in turn.
7155 Permission is granted to distribute modified versions
7156 of this document, or of portions of it,
7157 under the above conditions, provided also that they
7158 carry prominent notices stating who last changed them.
7161 version-control: never