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 * Unicode 14.0.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 14.0.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * Bump r_version in the debugger interface to 2 and add a new field,
17 r_next, support multiple namespaces.
19 * Support for the C.UTF-8 locale has been added to glibc. The locale
20 supports full code-point sorting for all valid Unicode code points. A
21 limitation in the framework for fnmatch, regexec, and regcomp requires
22 a compromise to save space and only ASCII-based range expressions are
23 supported for now (see bug 28255). The full size of the locale is
24 only ~400KiB, with 346KiB coming from LC_CTYPE information for
25 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
26 in various downstream distributions. The locale is not built into
27 glibc, and must be installed.
29 * <math.h> functions that round their results to a narrower type, and
30 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
31 18661-3:2015 and draft ISO C2X:
33 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
34 fMxsqrtfN and fMxsqrtfNx functions.
36 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
39 * <math.h> functions for floating-point maximum and minimum,
40 corresponding to new operations in IEEE 754-2019, and corresponding
41 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
42 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
43 fminimum_mag, fminimum_mag_num and corresponding functions for float,
44 long double, _FloatN and _FloatNx.
46 * <math.h> macros for single-precision float constants are added as a
47 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
48 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
51 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
52 predefined as specified in TS 18661-1:2014.
54 * The exp10 functions in <math.h> now have a corresponding type-generic
57 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
59 * printf-family functions now support the %b format for output of
60 integers in binary, as specified in draft ISO C2X, and the %B variant
61 of that format recommended by draft ISO C2X.
63 * A new DSO sorting algorithm has been added in the dynamic linker that uses
64 topological sorting by depth-first search (DFS), solving performance issues
65 of the existing sorting algorithm when encountering particular circular
66 object dependency cases.
68 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
69 the two DSO sorting algorithms. The default setting of '2' uses the
70 new DFS-based algorithm. The setting '1' switches to the old
71 algorithm used in glibc 2.33 and earlier.
73 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
74 to be used by compilers for optimizing usage of 'memcmp' when its
75 return value is only used for its boolean status.
77 * Support for automatically registering threads with the Linux rseq
78 system call has been added. This system call is implemented starting
79 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
80 operations on per-cpu data. It allows user-space to perform updates
81 on per-cpu data without requiring heavy-weight atomic operations.
82 Automatically registering threads allows all libraries, including
83 libc, to make immediate use of the rseq support by using the
84 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
85 variables. The GNU C Library manual has details on integration of
86 Restartable Sequences.
88 * A symbolic link to the dynamic linker is now installed under
89 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
91 * All programs and the testsuite in glibc are now built as position independent
92 executables (PIE) by default on toolchains and architectures that support it.
93 Further, if the toolchain and architecture supports it, even static programs
94 are built as PIE and the resultant glibc can be used to build static PIE
95 executables. A new option --disable-default-pie has been added to disable
96 this behavior and get a non-PIE build. This option replaces
97 --enable-static-pie, which no longer has any effect on the build
100 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
101 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
102 or to use huge pages directly with mmap calls with the MAP_HUGETLB
103 flags). The former can improve performance when Transparent Huge Pages
104 is set to 'madvise' mode while the latter uses the system reserved
107 * The printf family of functions now handles the flagged %#m conversion
108 specifier, printing errno as an error constant (similar to strerrorname_np).
110 * The function _dl_find_object has been added. In-process unwinders
111 can use it to efficiently locate unwinding information for a code
114 * Support for OpenRISC running on Linux has been added. This port requires
115 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
120 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
121 64-bit file offsets (LFS default).
123 * A new configure option, --with-rtld-early-cflags, can be used to
124 specify additional compiler flags for building the early startup code
125 of the dynamic linker. On targets which have CPU compatibility
126 checks, this can help to ensure that proper diagnostics are printed if
127 the dynamic loader runs on an incompatible CPU.
129 * On Linux, the epoll_pwait2 function has been added. It is similar to
130 epoll_wait with the difference the timeout has nanoseconds resolution.
132 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
133 enabling posix_spawn and posix_spawnp to set the controlling terminal in
134 the new process in a race free manner. This function is a GNU extension.
136 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
137 applications compiling with glibc and gcc 12 and later. Level 3 leverages
138 the __builtin_dynamic_object_size function to deliver additional
139 fortification balanced against additional runtime cost (checking non-constant
142 Deprecated and removed features, and other changes affecting compatibility:
144 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
145 has been removed since the first PT_LOAD segment is no longer executable
146 due to defaulting to -z separate-code.
148 * The r_version update in the debugger interface makes the glibc binary
149 incompatible with GDB binaries built without the following commits:
151 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
152 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
154 when audit modules or dlmopen are used.
156 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
158 * The --enable-static-pie option is no longer available. The glibc build
159 configuration script now automatically detects static-pie support in the
160 toolchain and architecture and enables it if available.
162 * The catchsegv script and associated libSegFault.so shared object have
163 been removed. There are widely-deployed out-of-process alternatives for
164 catching coredumps and backtraces.
166 * Support for prelink will be removed in the next release; this includes
167 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
168 variables and their functionality in the dynamic loader.
170 Changes to build and runtime requirements:
172 * The audit module interface version LAV_CURRENT is increased to enable
173 proper bind-now support. The loader now advertises via the la_symbind
174 flags that PLT trace is not possible. New audit modules require the
175 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
176 modules are still loaded for all targets except aarch64.
178 * The audit interface on aarch64 is extended to support both the indirect
179 result location register (x8) and NEON Q register. Old audit modules are
180 rejected by the loader. Audit modules must be rebuilt to use the newer
181 structure sizes and the latest module interface version for LAV_CURRENT.
183 Security related changes:
185 CVE-2022-23219: Passing an overlong file name to the clnt_create
186 legacy function could result in a stack-based buffer overflow when
187 using the "unix" protocol. Reported by Martin Sebor.
189 CVE-2022-23218: Passing an overlong file name to the svcunix_create
190 legacy function could result in a stack-based buffer overflow.
192 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
193 function could result in a memory leak and potential access of
194 uninitialized memory. Reported by Qualys.
196 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
197 function may result in an off-by-one buffer underflow and overflow
198 when the current working directory is longer than PATH_MAX and also
199 corresponds to the / directory through an unprivileged mount
200 namespace. Reported by Qualys.
202 The following bugs are resolved with this release:
204 [The release manager will add the list generated by
205 scripts/list-fixed-bugs.py just before the release.]
212 * In order to support smoother in-place-upgrades and to simplify
213 the implementation of the runtime all functionality formerly
214 implemented in the libraries libpthread, libdl, libutil, libanl has
215 been integrated into libc. New applications do not need to link with
216 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
217 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
218 provided, so that the linker options keep working. Applications which
219 have been linked against glibc 2.33 or earlier continue to load the
220 corresponding shared objects (which are now empty). The integration
221 of those libraries into libc means that additional symbols become
222 available by default. This can cause applications that contain weak
223 references to take unexpected code paths that would only have been
224 used in previous glibc versions when e.g. preloading libpthread.so.0,
225 potentially exposing application bugs.
227 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
228 PTHREAD_STACK_MIN is no longer constant and is redefined to
229 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
230 sets for modern architectural features like Arm SVE.
232 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
233 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
234 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
235 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
236 dynamic sized register sets for modern architectural features like
239 * The dynamic linker implements the --list-diagnostics option, printing
240 a dump of information related to IFUNC resolver operation and
241 glibc-hwcaps subdirectory selection.
243 * On Linux, the function execveat has been added. It operates similar to
244 execve and it is is already used to implement fexecve without requiring
245 /proc to be mounted. However, different than fexecve, if the syscall is not
246 supported by the kernel an error is returned instead of trying a fallback.
248 * The ISO C2X function timespec_getres has been added.
250 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
251 C2X, is supported to enable declarations of functions defined in Annex F
252 of C2X. Those declarations are also enabled when
253 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
254 defined, and when _GNU_SOURCE is defined.
256 * On powerpc64*, glibc can now be compiled without scv support using the
257 --disable-scv configure option.
259 * Add support for 64-bit time_t on configurations like x86 where time_t
260 is traditionally 32-bit. Although time_t still defaults to 32-bit on
261 these configurations, this default may change in future versions.
262 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
263 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
264 only enabled for Linux and the full support requires a minimum kernel
267 * The main gconv-modules file in glibc now contains only a small set of
268 essential converter modules and the rest have been moved into a supplementary
269 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
270 in the same GCONV_PATH. Similarly, external converter modules directories
271 may have supplementary configuration files in a gconv-modules.d directory
272 with names ending with .conf to logically classify the converter modules in
275 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
276 to configure the size of the thread stack cache.
278 * The function _Fork has been added as an async-signal-safe fork replacement
279 since Austin Group issue 62 droped the async-signal-safe requirement for
280 fork (and it will be included in the future POSIX standard). The new _Fork
281 function does not run any atfork function neither resets any internal state
282 or lock (such as the malloc one), and only sets up a minimal state required
283 to call async-signal-safe functions (such as raise or execve). This function
284 is currently a GNU extension.
286 * On Linux, the close_range function has been added. It allows efficiently
287 closing a range of file descriptors on recent kernels (version 5.9).
289 * The function closefrom has been added. It closes all file descriptors
290 greater than or equal to a given integer. This function is a GNU extension,
291 although it is also present in other systems.
293 * The posix_spawn_file_actions_addclosefrom_np function has been added,
294 enabling posix_spawn and posix_spawnp to close all file descriptors greater
295 than or equal to a given integer. This function is a GNU extension,
296 although Solaris also provides a similar function.
298 * When invoked explicitly, the dynamic linker now uses the kernel to
299 execute programs that do not have any dynamic dependency (that is,
300 they are statically linked). This feature is Linux-specific.
302 * The audit libraries will avoid unnecessary slowdown if it is not required
303 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
305 Deprecated and removed features, and other changes affecting compatibility:
307 * The function pthread_mutex_consistent_np has been deprecated; programs
308 should use the equivalent standard function pthread_mutex_consistent
311 * The function pthread_mutexattr_getrobust_np has been deprecated;
312 programs should use the equivalent standard function
313 pthread_mutexattr_getrobust instead.
315 * The function pthread_mutexattr_setrobust_np has been deprecated;
316 programs should use the equivalent standard function
317 pthread_mutexattr_setrobust instead.
319 * The function pthread_yield has been deprecated; programs should use
320 the equivalent standard function sched_yield instead.
322 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
324 * Various rarely-used functions declared in <resolv.h> and
325 <arpa/nameser.h> have been deprecated. Applications are encouraged to
326 use dedicated DNS processing libraries if applicable. For <resolv.h>,
327 this affects the functions dn_count_labels, fp_nquery, fp_query,
328 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
329 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
330 p_type, putlong, putshort, res_hostalias, res_isourserver,
331 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
332 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
333 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
334 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
336 * Various symbols previously defined in libresolv have been moved to libc
337 in order to prepare for libresolv moving entirely into libc (see earlier
338 entry for merging libraries into libc). The symbols __dn_comp,
339 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
340 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
341 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
342 __res_search, __res_send formerly in libresolv have been renamed and no
343 longer have a __ prefix. They are now available in libc.
345 * The pthread cancellation handler is now installed with SA_RESTART and
346 pthread_cancel will always send the internal SIGCANCEL on a cancellation
347 request. It should not be visible to applications since the cancellation
348 handler should either act upon cancellation (if asynchronous cancellation
349 is enabled) or ignore the cancellation internal signal. However there are
350 buggy kernel interfaces (for instance some CIFS versions) that could still
351 see a spurious EINTR error when cancellation interrupts a blocking syscall.
353 * Previously, glibc installed its various shared objects under versioned
354 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
355 were provided as symbolic links. Starting with glibc 2.34, the shared
356 objects are installed under their ABI sonames directly, without
357 symbolic links. This increases compatibility with distribution
358 package managers that delete removed files late during the package
359 upgrade or downgrade process.
361 * The symbols mallwatch and tr_break are now deprecated and no longer used in
362 mtrace. Similar functionality can be achieved by using conditional
363 breakpoints within mtrace functions from within gdb.
365 * The __morecore and __after_morecore_hook malloc hooks and the default
366 implementation __default_morecore have been removed from the API. Existing
367 applications will continue to link against these symbols but the interfaces
368 no longer have any effect on malloc.
370 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
371 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
372 disabled by default in the main C library. Users looking to use these
373 features now need to preload a new debugging DSO libc_malloc_debug.so to get
374 this functionality back.
376 * The deprecated functions malloc_get_state and malloc_set_state have been
377 moved from the core C library into libc_malloc_debug.so. Legacy applications
378 that still use these functions will now need to preload libc_malloc_debug.so
379 in their environment using the LD_PRELOAD environment variable.
381 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
382 __memalign_hook and __free_hook are now removed from the API. Compatibility
383 symbols are present to support legacy programs but new applications can no
384 longer link to these symbols. These hooks no longer have any effect on glibc
385 functionality. The malloc debugging DSO libc_malloc_debug.so currently
386 supports hooks and can be preloaded to get this functionality back for older
387 programs. However this is a transitional measure and may be removed in a
388 future release of the GNU C Library. Users may port away from these hooks by
389 writing and preloading their own malloc interposition library.
391 Changes to build and runtime requirements:
393 * On Linux, the shm_open, sem_open, and related functions now expect the
394 file shared memory file system to be mounted at /dev/shm. These functions
395 no longer search among the system's mount points for a suitable
396 replacement if /dev/shm is not available.
398 Security related changes:
400 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
401 a request for netgroup lookup, may crash due to a double-free,
402 potentially resulting in degraded service or Denial of Service on the
403 local system. Reported by Chris Schanzle.
405 CVE-2021-33574: The mq_notify function has a potential use-after-free
406 issue when using a notification type of SIGEV_THREAD and a thread
407 attribute with a non-default affinity mask.
409 CVE-2021-35942: The wordexp function may overflow the positional
410 parameter number when processing the expansion resulting in a crash.
411 Reported by Philippe Antoine.
413 The following bugs are resolved with this release:
415 [4737] libc: fork is not async-signal-safe
416 [5781] math: Slow dbl-64 sin/cos/sincos for special values
417 [10353] libc: Methods for deleting all file descriptors greater than
418 given integer (closefrom)
419 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
420 name containing multi-byte character(s)
421 [14469] math: Inaccurate j0f function
422 [14470] math: Inaccurate j1f function
423 [14471] math: Inaccurate y0f function
424 [14472] math: Inaccurate y1f function
425 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
427 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
428 crashes if it fails dlsym() twice
429 [15648] nptl: multiple definition of `__lll_lock_wait_private'
430 [16063] nptl: Provide a pthread_once variant in libc directly
431 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
432 [17145] libc: syslog with LOG_CONS leaks console file descriptor
433 [17183] manual: description of ENTRY struct in <search.h> in glibc
435 [18435] nptl: pthread_once hangs when init routine throws an exception
436 [18524] nptl: Missing calloc error checking in
437 __cxa_thread_atexit_impl
438 [19329] dynamic-link: dl-tls.c assert failure at concurrent
439 pthread_create and dlopen
440 [19366] nptl: returning from a thread should disable cancellation
441 [19511] nptl: 8MB memory leak in pthread_create in case of failure
442 when non-root user changes priority
443 [20802] dynamic-link: getauxval NULL pointer dereference after static
445 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
446 [22057] malloc: malloc_usable_size is broken with mcheck
447 [22668] locale: LC_COLLATE: the last character of ellipsis is not
449 [23323] libc: [RFE] CSU startup hardening.
450 [23328] malloc: Remove malloc hooks and ensure related APIs return no
452 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
453 $PLATFORM, $ORIGIN) crashes
454 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
455 [23554] nptl: pthread_getattr_np reports wrong stack size with
457 [24106] libc: Bash interpreter in ldd script is taken from host
458 [24773] dynamic-link: dlerror in an secondary namespace does not use
459 the right free implementation
460 [25036] localedata: Update collation order for Swedish
461 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
462 shm_open to pick wrong directory
463 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
464 crash in IFUNC resolver due to stack canary (--enable-stack-
466 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
467 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
468 [27111] dynamic-link: pthread_create and tls access use link_map
469 objects that may be concurrently freed by dlclose
470 [27132] malloc: memusagestat is linked to system librt, leading to
471 undefined symbols on major version upgrade
472 [27136] dynamic-link: dtv setup at thread creation may leave an entry
474 [27249] libc: libSegFault.so does not output signal number properly
475 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
477 [27318] dynamic-link: glibc fails to load binaries when built with
478 -march=sandybridge: CPU ISA level is lower than required
479 [27343] nss: initgroups() SIGSEGVs when called on a system without
480 nsswich.conf (in a chroot)
481 [27346] dynamic-link: x86: PTWRITE feature check is missing
482 [27389] network: NSS chroot hardening causes regressions in chroot
484 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
485 [27444] libc: sysconf reports unsupported option (-1) for
486 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
487 [27462] nscd: double-free in nscd (CVE-2021-27645)
488 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
489 malloc/tst-malloc-thread-fail
490 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
491 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
493 [27522] glob: glob, glob64 incorrectly marked as __THROW
494 [27555] dynamic-link: Static tests fail with --enable-stack-
496 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
497 information for the current directory
498 [27577] dynamic-link: elf/ld.so --help doesn't work
499 [27605] libc: tunables can't control xsave/xsavec selection in
501 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
502 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
504 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
505 _nss_files_getcanonname_r) from within a dlmopen namespace.
506 [27648] libc: FAIL: misc/tst-select
507 [27650] stdio: vfscanf returns too early if a match is longer than
509 [27651] libc: Performance regression after updating to 2.33
510 [27655] string: Wrong size calculation in string/test-strnlen.c
511 [27706] libc: select fails to update timeout on error
512 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
513 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
514 tries resolving them lazily
515 [27744] nptl: Support different libpthread/ld.so load orders in
517 [27749] libc: Data race __run_exit_handlers
518 [27761] libc: getconf: Segmentation fault when passing '-vq' as
520 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
521 exceeds maximum object size 2147483647
522 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
524 [27872] build: Obsolete configure option --enable-stackguard-
526 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
527 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
528 [27892] libc: powerpc: scv ABI error handling fails to check
530 [27896] nptl: mq_notify does not handle separately allocated thread
531 attributes (CVE-2021-33574)
532 [27901] libc: TEST_STACK_ALIGN doesn't work
533 [27902] libc: The x86-64 clone wrapper fails to align child stack
534 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
535 [27939] libc: aarch64: clone does not align the stack
536 [27968] libc: s390x: clone does not align the stack
537 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
538 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
540 [28028] malloc: malloc: tcache shutdown sequence does not work if the
541 thread never allocated anything
542 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
543 [28064] string: x86_64:wcslen implementation list has wcsnlen
544 [28067] libc: FAIL: posix/tst-spawn5
545 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
546 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
548 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
549 [28089] build: tst-tls20 fails when linker defaults to --as-needed
550 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
552 [28091] network: ns_name_skip may return 0 for domain names without
560 * The dynamic linker accepts the --list-tunables argument which prints
561 all the supported tunables. This option is disable if glibc is
562 configured with tunables disabled (--enable-tunables=no).
564 * The dynamic linker accepts the --argv0 argument and provides opportunity
565 to change argv[0] string.
567 * The dynamic linker loads optimized implementations of shared objects
568 from subdirectories under the glibc-hwcaps directory on the library
569 search path if the system's capabilities meet the requirements for
570 that subdirectory. Initially supported subdirectories include
571 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
572 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
573 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
574 subdirectory names correspond to the vendor-independent x86-64
575 microarchitecture levels defined in the x86-64 psABI supplement.
577 * The new --help option of the dynamic linker provides usage and
578 information and library search path diagnostics.
580 * The mallinfo2 function is added to report statistics as per mallinfo,
581 but with larger field widths to accurately report values that are
582 larger than fit in an integer.
584 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
586 * Support for the RISC-V ISA running on Linux has been expanded to run on
587 32-bit hardware. This is supported for the following ISA and ABI pairs:
593 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
596 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
597 glibc may use additional checks that may have an additional performance
598 overhead. At present these checks are available only on LLVM 9 and later.
599 The latest GCC available at this time (10.2) does not support this level of
602 Deprecated and removed features, and other changes affecting compatibility:
604 * The mallinfo function is marked deprecated. Callers should call
607 * When dlopen is used in statically linked programs, alternative library
608 implementations from HWCAP subdirectories are no longer loaded.
609 Instead, the default implementation is used.
611 * The deprecated <sys/vtimes.h> header and the function vtimes have been
612 removed. To support old binaries, the vtimes function continues to exist
613 as a compatibility symbol. Applications should use the getrlimit or
616 * Following a change in the tzdata 2018a release upstream, the zdump
617 program is now installed in the /usr/bin subdirectory. Previously,
618 the /usr/sbin subdirectory was used.
620 * On s390(x), the type float_t is now derived from the macro
621 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
622 hardcoded to double. This does not affect the ABI of any libraries
623 that are part of the GNU C Library, but may affect the ABI of other
624 libraries that use this type in their interfaces. The new definition
625 improves consistency with compiler behavior in many scenarios.
627 * A future version of glibc will stop loading shared objects from the
628 "tls" subdirectories on the library search path, the subdirectory that
629 corresponds to the AT_PLATFORM system name, and also stop employing
630 the legacy AT_HWCAP search mechanism. Applications should switch to
631 the new glibc-hwcaps mechanism instead; if they do not do that, only
632 the baseline version (directly from the search path directory) will be
635 Changes to build and runtime requirements:
637 * On Linux, the system administrator needs to configure /dev/pts with
638 the intended access modes for pseudo-terminals. glibc no longer
639 attemps to adjust permissions of terminal devices. The previous glibc
640 defaults ("tty" group, user read/write and group write) already
641 corresponded to what most systems used, so that grantpt did not
642 perform any adjustments.
644 * On Linux, the posix_openpt and getpt functions no longer attempt to
645 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
646 (and pseudo-terminals are supported), a devpts file system is mounted
647 on /dev/pts. Current systems already meet these requirements.
649 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
651 Security related changes:
653 CVE-2021-3326: An assertion failure during conversion from the
654 ISO-20220-JP-3 character set using the iconv function has been fixed.
655 This assertion was triggered by certain valid inputs in which the
656 converted output contains a combined sequence of two wide characters
657 crossing a buffer boundary. Reported by Tavis Ormandy.
659 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
660 invoked with input containing redundant shift sequences in the IBM1364,
661 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
663 CVE-2020-29562: An assertion failure has been fixed in the iconv function
664 when invoked with UCS4 input containing an invalid character.
666 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
667 invoked with EUC-KR input containing invalid multibyte input sequences.
669 The following bugs are resolved with this release:
671 [10635] libc: realpath portability patches
672 [16124] dynamic-link: ld.so should allow to change argv[0]
673 [17924] malloc: 'free' should not set errno
674 [18683] libc: Linux faccessat implementation can incorrectly ignore
676 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
677 [23091] hurd: missing waitid support
678 [23249] libc: Epyc and other current AMD CPUs do not select the
679 "haswell" platform subdirectory
680 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
682 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
684 [24941] libc: Make grantpt usable after multi-threaded fork in more
686 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
687 [24973] locale: iconv encounters segmentation fault when converting
688 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
689 [25399] string: undefined reference to `__warn_memset_zero_len' when
690 changing gnuc version
691 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
693 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
695 [25971] libc: s390 bits/hwcap.h out of sync with kernel
696 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
697 [26100] libc: Race in syslog(3) with regards to tag printing.
698 [26124] libc: Export <cpu-features.h>
699 [26130] nscd: Inconsistent nscd cache during pruning
700 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
701 [26224] locale: iconv hangs when converting some invalid inputs from
702 several IBM character sets (CVE-2020-27618)
703 [26341] libc: realpath cyclically call __alloca(path_max) to consume
705 [26343] manual: invalid documented return type for strerrorname_np(),
706 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
707 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
709 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
711 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
712 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
714 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
715 [26553] libc: mtx_init allows type set to "mtx_recursive" only
716 [26555] string: strerrorname_np does not return the documented value
717 [26592] libc: pointer arithmetic overflows in realpath
718 [26600] network: Transaction ID collisions cause slow DNS lookups in
720 [26606] libc: [2.33 Regression] pselect is broken on x32
721 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
722 [26620] glob: fnmatch with collating symbols results in segmentation
724 [26625] libc: [2.33 Regression] CET is disabled
725 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
726 at the end of a memory mapping
727 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
728 by the caller to the kernel
729 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
730 [26647] build: [-Werror=array-parameter=] due to different
731 declarations for __sigsetjmp
732 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
734 [26649] stdio: printf should handle non-normal x86 long double numbers
735 gracefully (CVE-2020-29573)
736 [26686] build: -Warray-parameter instances building with GCC 11
737 [26687] build: -Warray-bounds instances building with GCC 11
738 [26690] stdio: Aliasing violation in __vfscanf_internal
739 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
740 [26726] build: GCC warning calling new_composite_name with an array of
742 [26736] libc: FAIL: misc/tst-sysvshm-linux
743 [26737] libc: Random FAIL: rt/tst-shm
744 [26791] libc: Missing O_CLOEXEC in sysconf.c
745 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
747 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
749 [26818] string: aarch64: string tests may run ifunc variants that are
751 [26821] libc: Memory leak test failures on Fedora 33
752 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
753 FSGSBASE/LM/RDRAND check failure
754 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
756 [26853] libc: aarch64: Missing unwind information in statically linked
758 [26923] locale: Assertion failure in iconv when converting invalid
759 UCS4 (CVE-2020-29562)
760 [26926] dynamic-link: aarch64: library dependencies are not bti
762 [26932] libc: sh: Multiple floating point functions defined as stubs
764 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
766 [26988] dynamic-link: aarch64: BTI mprotect address is not page
768 [27002] build: libc_freeres_fn build failure with GCC 11
769 [27004] dynamic-link: ld.so is miscompiled by GCC 11
770 [27008] dynamic-link: ld.so.cache should have endianness markup
771 [27042] libc: [alpha] anonymous union in struct stat confuses
773 [27053] libc: Conformance regression in system(3) (and probably also
775 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
777 [27077] network: Do not reload /etc/nsswitch.conf from chroot
778 [27083] libc: Unsafe unbounded alloca in addmntent
779 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
781 [27130] string: "rep movsb" performance issue
782 [27150] libc: alpha: wait4() is unavailable in static linking
783 [27177] dynamic-link:
784 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
786 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
787 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
788 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
789 related to combining characters (CVE-2021-3326)
796 * Unicode 13.0.0 Support: Character encoding, character type info, and
797 transliteration tables are all updated to Unicode 13.0.0, using
798 generator scripts contributed by Mike FABIAN (Red Hat).
800 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
802 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
803 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
804 Three ABIs are supported:
810 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
811 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
813 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
814 DT_DEPAUDIT dynamic section entries of the main executable.
816 * powerpc64le supports IEEE128 long double libm/libc redirects when
817 using -mabi=ieeelongdouble to compile C code on supported GCC
818 toolchains. It is recommended to use GCC 8 or newer when testing
821 * To help detect buffer overflows and other out-of-bounds accesses
822 several APIs have been annotated with GCC 'access' attribute. This
823 should help GCC 10 issue better warnings.
825 * On Linux, functions pthread_attr_setsigmask_np and
826 pthread_attr_getsigmask_np have been added. They allow applications
827 to specify the signal mask of a thread created with pthread_create.
829 * The GNU C Library now provides the header file <sys/single_threaded.h>
830 which declares the variable __libc_single_threaded. Applications are
831 encouraged to use this variable for single-thread optimizations,
832 instead of weak references to symbols historically defined in
835 * The functions sigabbrev_np and sigdescr_np have been added. The
836 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
837 SIGHUP) while sigdescr_np returns a string describing the signal number
838 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
839 attempt to translate the return description, both functions return
840 NULL for an invalid signal number.
842 They should be used instead of sys_siglist or sys_sigabbrev and they
843 are both thread and async-signal safe. These functions are GNU extensions.
845 * The functions strerrorname_np and strerrordesc_np have been added. The
846 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
847 while strerrordesc_np returns a string describing the error number
848 (e.g "Invalid argument" for EINVAL). Different than strerror,
849 strerrordesc_np does not attempt to translate the return description, both
850 functions return NULL for an invalid error number.
852 They should be used instead of sys_errlist and sys_nerr, both are
853 thread and async-signal safe. These functions are GNU extensions.
855 * AArch64 now supports standard branch protection security hardening
856 in glibc when it is built with a GCC that is configured with
857 --enable-standard-branch-protection (or if -mbranch-protection=standard
858 flag is passed when building both GCC target libraries and glibc,
859 in either case a custom GCC is needed). This includes branch target
860 identification (BTI) and pointer authentication for return addresses
861 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
862 extensions respectively for the protection to be effective,
863 otherwise the used instructions are nops. User code can use PAC-RET
864 without libc support, but BTI requires a libc that is built with BTI
865 support, otherwise runtime objects linked into user code will not be
868 Deprecated and removed features, and other changes affecting compatibility:
870 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
871 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
872 RPC header files. Backward compatibility for old programs is kept
873 only for architectures and ABIs that have been added in or before
874 glibc 2.31. New programs need to use TI-RPC
875 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
876 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
878 * Remove configure option --enable-obsolete-nsl. libnsl is only built
879 as shared library for backward compatibility and the NSS modules "nis"
880 and "nisplus" are not built at all and libnsl's headers aren't
881 installed. This compatibility is kept only for architectures and ABIs
882 that have been added in or before version 2.28. Replacement
883 implementations based on TI-RPC, which additionally support IPv6, are
884 available from <https://github.com/thkukuk/>. This change does not
885 affect the "compat" NSS module, which does not depend on libnsl
886 since 2.27 and thus can be used without NIS.
888 * The deprecated <sys/sysctl.h> header and the sysctl function have been
889 removed. To support old binaries, the sysctl function continues to
890 exist as a compatibility symbol (on those architectures which had it),
891 but always fails with ENOSYS. This reflects the removal of the system
892 call from all architectures, starting with Linux 5.5.
894 * The sstk function is no longer available to newly linked binaries.
895 Its implementation always returned with a failure, and the function
896 was not declared in any header file.
898 * The legacy signal handling functions siginterrupt, sigpause, sighold,
899 sigrelse, sigignore and sigset, and the sigmask macro have been
900 deprecated. Applications should use the sigsuspend, sigprocmask and
901 sigaction functions instead.
903 * ldconfig now defaults to the new format for ld.so.cache. glibc has
904 already supported this format for almost 20 years.
906 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
907 are no longer available to newly linked binaries, and their declarations
908 have been removed from <string.h>. They are exported solely as
909 compatibility symbols to support old binaries. All programs should use
912 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
913 are no longer available to newly linked binaries, and their declarations
914 have been removed from <stdio.h>. They are exported solely as
915 compatibility symbols to support old binaries. All programs should use
916 strerror or strerror_r instead.
918 * Both strerror and strerror_l now share the same internal buffer in the
919 calling thread, meaning that the returned string pointer may be invalided
920 or contents might be overwritten on subsequent calls in the same thread or
921 if the thread is terminated. It makes strerror MT-safe.
923 * Using weak references to libpthread functions such as pthread_create
924 or pthread_key_create to detect the singled-threaded nature of a
925 program is an obsolescent feature. Future versions of glibc will
926 define pthread_create within libc.so.6 itself, so such checks will
927 always flag the program as multi-threaded. Applications should check
928 the __libc_single_threaded variable declared in
929 <sys/single_threaded.h> instead.
931 * The "files" NSS module no longer supports the "key" database (used for
932 secure RPC). The contents of the /etc/publickey file will be ignored,
933 regardless of the settings in /etc/nsswitch.conf. (This method of
934 storing RPC keys only supported the obsolete and insecure AUTH_DES
935 flavor of secure RPC.)
937 * The __morecore and __after_morecore_hook malloc hooks and the default
938 implementation __default_morecore have been deprecated. Applications
939 should use malloc interposition to change malloc behavior, and mmap to
940 allocate anonymous memory. A future version of glibc may require that
941 applications which use the malloc hooks must preload a special shared
942 object, to enable the hooks.
944 * The hesiod NSS module has been deprecated and will be removed in a
945 future version of glibc. System administrators are encouraged to
946 switch to other approaches for networked account databases, such as
949 Changes to build and runtime requirements:
951 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
952 long double redirects.
954 Security related changes:
956 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
957 invoked with the -c option and when processing invalid multi-byte input
958 sequences. Reported by Jan Engelhardt.
960 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
961 corruption when they were passed a pseudo-zero argument. Reported by Guido
962 Vranken / ForAllSecure Mayhem.
964 CVE-2020-1752: A use-after-free vulnerability in the glob function when
965 expanding ~user has been fixed.
967 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
968 memmove functions has been fixed. Discovered by Jason Royes and Samual
969 Dytrych of the Cisco Security Assessment and Penetration Team (See
972 The following bugs are resolved with this release:
974 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
975 [10441] manual: Backtraces code example lacks error checking
976 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
977 timer_sigev_thread dangerous
978 [14231] stdio: stdio-common tests memory requirements
979 [14578] libc: /proc-based emulation for lchmod, fchmodat
980 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
981 filtee has constructor
982 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
983 sequences (CVE-2016-10228)
984 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
985 character entities for infinity & pi
986 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
987 segfaults in applications
988 [20543] libc: Please move from .gnu.linkonce to comdat
989 [22489] network: gcc warns about implicit convertion in
990 ICMP6_FILTER_SETPASS with -Wsign-conversion
991 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
992 [23294] math: Complex _FloatN functions are redirected to the wrong
993 function with -mlong-double-64
994 [23296] libc: Data race in setting function descriptor during lazy
996 [23668] dynamic-link: ldconfig: Default to the new format for
998 [23819] hurd: hurd: Add C11 thread support
999 [23990] build: test-container error out on failure to exec child.
1000 [23991] build: shell-container typo in run_command_array
1001 [24638] manual: Error in example of parsing a template string
1002 [24654] manual: Wrong declaration of wcschr in libc manual
1003 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1005 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1006 dynamically loaded dsos
1007 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1008 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1010 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1011 restore EAX, ECX and EDX
1012 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1013 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1014 [25420] network: Race condition in resolv_conf.c can result in caching
1015 stale configuration forever
1016 [25487] math: sinl() stack corruption from crafted input
1018 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1020 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1021 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1023 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1024 on 32 bit and old kernel
1025 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1026 [25639] localedata: Some names of days and months wrongly spelt in
1028 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1029 amount of sigset_t bytes
1030 [25691] stdio: printf: memory leak when printing long multibyte
1032 [25715] libc: system() returns wrong errors when posix_spawn fails
1033 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1034 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1035 state for conversions that produce two Unicode code points
1036 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1037 for linux x86_64 leads to livelock
1038 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1039 test failures, invalid instruction in ld.so
1040 [25790] glob: Typo in tst-fnmatch.input
1041 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1043 [25819] localedata: Update locale data to Unicode 13.0.0
1044 [25824] libc: Abnormal function of strnlen in aarch64
1045 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1046 [25896] libc: Incorrect prctl
1047 [25902] libc: Bad LOADARGS_N
1048 [25905] dynamic-link: VSX registers are corrupted during PLT
1049 resolution when glibc is built with --disable-multi-arch and --with-
1051 [25933] string: Off by one error in __strncmp_avx2 when
1052 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1054 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1055 exiting detached thread
1056 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1058 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1060 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1061 [26073] math: getpayload() has wrong return value
1062 [26076] dynamic-link: dlmopen crashes after failing to load
1063 dependencies in audit mode
1064 [26120] localedata: column width of of some Korean
1065 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1066 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1067 [26133] libc: Incorrect need_arch_feature_F16C
1068 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1070 [26149] libc: PKU is usable only if OSPKE is set
1071 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1073 [26208] libc: Incorrect bit_cpu_CLFSH
1074 [26210] network: Incorrect use of hidden symbols for global sunrpc
1076 [26211] stdio: printf integer overflow calculating allocation size
1077 [26214] stdio: printf_fp double free
1078 [26215] stdio: printf_fp memory leak
1079 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1080 [26258] nss: nss_compat should not read input files with mmap
1081 [26332] string: Incorrect cache line size load causes memory
1082 corruption in memset
1089 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1090 enable features from the draft ISO C2X standard. Only some features from
1091 this draft standard are supported by the GNU C Library, and as the draft
1092 is under active development, the set of features enabled by this macro is
1093 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1094 by compiling with "gcc -std=gnu2x".
1096 * The <math.h> functions that round their results to a narrower type now
1097 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1098 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1099 Clarification Request 13 to TS 18661-3.
1101 * The function pthread_clockjoin_np has been added, enabling join with a
1102 terminated thread with a specific clock. It allows waiting against
1103 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1105 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1107 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1108 in queries if the trust-ad option is set via the options directive in
1109 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1110 mode, the AD bit, as provided by the name server, is available to
1111 applications which call res_search and related functions. In the default
1112 mode, the AD bit is not set in queries, and it is automatically cleared in
1113 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1114 servers and the network path to them are treated as untrusted.)
1116 Deprecated and removed features, and other changes affecting compatibility:
1118 * The totalorder and totalordermag functions, and the corresponding
1119 functions for other floating-point types, now take pointer arguments to
1120 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1121 passing. This is in accordance with the resolution of Clarification
1122 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1123 floating-point arguments directly will continue to work.
1125 * The obsolete function stime is no longer available to newly linked
1126 binaries, and its declaration has been removed from <time.h>.
1127 Programs that set the system time should use clock_settime instead.
1129 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1130 in a future version of glibc. In this release, the header still exists
1131 but calling ftime will cause a compiler warning. All programs should use
1132 gettimeofday or clock_gettime instead.
1134 * The gettimeofday function no longer reports information about a
1135 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1136 many years, as it cannot handle the full complexity of the world's
1137 timezones, but hitherto we have supported it on a best-effort basis.
1138 Changes required to support 64-bit time_t on 32-bit architectures have
1139 made this no longer practical.
1141 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1142 should expect to receive a 'struct timezone' whose tz_minuteswest and
1143 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1144 happen on a few Linux-based ports. This will be corrected in a future
1147 All callers should supply a null pointer for the 'tzp' argument to
1148 gettimeofday. For accurate information about the time zone associated
1149 with the current time, use the localtime function.
1151 gettimeofday itself is obsolescent according to POSIX. We have no plans
1152 to remove access to this function, but portable programs should consider
1153 using clock_gettime instead.
1155 * The settimeofday function can still be used to set a system-wide time
1156 zone when the operating system supports it. This is because the Linux
1157 kernel reused the API, on some architectures, to describe a system-wide
1158 time-zone-like offset between the software clock maintained by the kernel,
1159 and the "RTC" clock that keeps time when the system is shut down.
1161 However, to reduce the odds of this offset being set by accident,
1162 settimeofday can no longer be used to set the time and the offset
1163 simultaneously. If both of its two arguments are non-null, the call
1164 will fail (setting errno to EINVAL).
1166 Callers attempting to set this offset should also be prepared for the call
1167 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1168 some Linux architectures. The Linux kernel maintainers are discussing a
1169 more principled replacement for the reused API. After a replacement
1170 becomes available, we will change settimeofday to fail with ENOSYS on all
1171 platforms when its 'tzp' argument is not a null pointer.
1173 settimeofday itself is obsolescent according to POSIX. Programs that set
1174 the system time should use clock_settime and/or the adjtime family of
1175 functions instead. We may cease to make settimeofday available to newly
1176 linked binaries after there is a replacement for Linux's time-zone-like
1179 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1180 the optional CAS instruction is implemented (for instance, LEON processors
1181 are still supported, but SuperSPARC processors are not).
1183 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1186 * If a lazy binding failure happens during dlopen, during the execution of
1187 an ELF constructor, the process is now terminated. Previously, the
1188 dynamic loader would return NULL from dlopen, with the lazy binding error
1189 captured in a dlerror message. In general, this is unsafe because
1190 resetting the stack in an arbitrary function call is not possible.
1192 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1193 executable stack unless explicitly configured at build time to require
1194 minimum kernel version 4.8 or newer. This is because executing
1195 floating-point branches on a non-executable stack on Linux kernels prior to
1196 4.8 can lead to application crashes for some MIPS configurations. While
1197 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1198 expected to enable non-executable stack by default with PT_GNU_STACK by
1199 default and is thus likely to trigger a crash on older kernels.
1201 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1202 non-executable stack while dropping support for older kernels.
1204 * System call wrappers for time system calls now use the new time64 system
1205 calls when available. On 32-bit targets, these wrappers attempt to call
1206 the new system calls first and fall back to the older 32-bit time system
1207 calls if they are not present. This may cause issues in environments
1208 that cannot handle unsupported system calls gracefully by returning
1209 -ENOSYS. Seccomp sandboxes are affected by this issue.
1211 Changes to build and runtime requirements:
1213 * It is no longer necessary to have recent Linux kernel headers to build
1214 working (non-stub) system call wrappers on all architectures except 64-bit
1215 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1217 * The ChangeLog file is no longer present in the toplevel directory of the
1218 source tree. ChangeLog files are located in the ChangeLog.old directory as
1219 ChangeLog.N where the highest N has the latest entries.
1221 Security related changes:
1223 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1224 out-of-bounds write when executed in a signal frame context.
1226 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1227 environment variable during program execution after a security
1228 transition, allowing local attackers to restrict the possible mapping
1229 addresses for loaded libraries and thus bypass ASLR for a setuid
1230 program. Reported by Marcin Kościelnicki.
1232 The following bugs are resolved with this release:
1234 [12031] localedata: iconv -t ascii//translit with Greek characters
1235 [15813] libc: Multiple issues in __gen_tempname
1236 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1237 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1238 [19767] libc: vdso is not used with static linking
1239 [19903] hurd: Shared mappings not being inherited by children processes
1240 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1241 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1243 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1244 Symbols-A/B Unicode blocks
1245 [23518] libc: Eliminate __libc_utmp_jump_table
1246 [24026] malloc: malloc_info() returns wrong numbers
1247 [24054] localedata: Many locales are missing date_fmt
1248 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1249 [24304] dynamic-link: Lazy binding failure during ELF
1250 constructors/destructors is not fatal
1251 [24376] libc: RISC-V symbol size confusion with _start
1252 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1254 [24824] libc: test-in-container does not install charmap files compatible
1256 [24844] regex: regex bad pointer / leakage if malloc fails
1257 [24867] malloc: Unintended malloc_info formatting changes
1258 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1259 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1260 [24882] libc: login: pututline uses potentially outdated cache
1261 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1262 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1264 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1266 [24930] dynamic-link: dlopen of PIE executable can result in
1267 _dl_allocate_tls_init assertion failure
1268 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1269 (stringop-overflow error)
1270 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1271 functions other can lead to crashes
1272 [24967] libc: jemalloc static linking causes runtime failure
1273 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1275 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1276 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1277 [25097] libc: new -Warray-bounds with GCC 10
1278 [25112] dynamic-link: dlopen must not make new objects accessible when it
1279 still can fail with an error
1280 [25139] localedata: Please add the new mnw_MM locale
1281 [25149] regex: Array bounds violation in proceed_next_node
1282 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1283 initialized correctly
1284 [25189] libc: glibc's __glibc_has_include causes issues with clang
1286 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1287 value to an unsigned
1288 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1289 binaries (CVE-2019-19126)
1290 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1292 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1294 [25232] string: <string.h> does not enable const correctness for strchr et
1296 [25233] localedata: Consider "." as the thousands separator for sl_SI
1298 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1299 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1300 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1302 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1303 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1305 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1306 (dl_initfirst) link map pointer
1307 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1308 [25423] libc: Array overflow in backtrace on powerpc
1309 [25425] network: Missing call to __resolv_context_put in
1310 getaddrinfo.c:gethosts
1317 * Unicode 12.1.0 Support: Character encoding, character type info, and
1318 transliteration tables are all updated to Unicode 12.1.0, using
1319 generator scripts contributed by Mike FABIAN (Red Hat).
1321 * The dynamic linker accepts the --preload argument to preload shared
1322 objects, in addition to the LD_PRELOAD environment variable.
1324 * The twalk_r function has been added. It is similar to the existing
1325 twalk function, but it passes an additional caller-supplied argument
1326 to the callback function.
1328 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1330 * Minguo (Republic of China) calendar support has been added as an
1331 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1334 * The entry for the new Japanese era has been added for ja_JP locale.
1336 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1337 pvalloc, memalign, and posix_memalign fail now with total object size
1338 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1339 pointer subtraction within the allocated object, where results might
1340 overflow the ptrdiff_t type.
1342 * The dynamic linker no longer refuses to load objects which reference
1343 versioned symbols whose implementation has moved to a different soname
1344 since the object has been linked. The old error message, symbol
1345 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1346 link time reference, is gone.
1348 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1349 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1350 functions. These behave similarly to their "timed" equivalents, but also
1351 accept a clockid_t parameter to determine which clock their timeout should
1352 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1353 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1354 time of the wait (unlike with pthread_condattr_setclock, which requires
1355 the clock choice at initialization time).
1357 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1358 work, new resolvers can use a second argument which can be extended in
1359 the future, currently it contains the AT_HWCAP2 value.
1361 Deprecated and removed features, and other changes affecting compatibility:
1363 * The copy_file_range function fails with ENOSYS if the kernel does not
1364 support the system call of the same name. Previously, user space
1365 emulation was performed, but its behavior did not match the kernel
1366 behavior, which was deemed too confusing. Applications which use the
1367 copy_file_range function can no longer rely on glibc to provide a fallback
1368 on kernels that do not support the copy_file_range system call, and if
1369 this function returns ENOSYS, they will need to use their own fallback.
1370 Support for copy_file_range for most architectures was added in version
1371 4.5 of the mainline Linux kernel.
1373 * The functions clock_gettime, clock_getres, clock_settime,
1374 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1375 for new applications (on architectures which had them). Instead, the
1376 definitions in libc will be used automatically, which have been available
1379 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1380 and <sys/stropts.h> have been removed.
1382 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1383 resolver flag (deprecated in glibc 2.25) have been removed.
1385 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1386 resolver have been removed from <resolv.h>.
1388 * With --enable-bind-now, installed programs are now linked with the
1391 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1392 configurations) has been removed, following the deprecation of this
1393 subarchitecture in version 8 of GCC, and its removal in version 9.
1395 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1396 header have been removed.
1398 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1399 deprecated and will be removed from a future version of glibc.
1400 Application should directly access /proc instead. For obtaining random
1401 bits, the getentropy function can be used.
1403 Changes to build and runtime requirements:
1405 * GCC 6.2 or later is required to build the GNU C Library.
1407 Older GCC versions and non-GNU compilers are still supported when
1408 compiling programs that use the GNU C Library.
1410 Security related changes:
1412 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1413 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1414 has undefined behavior. On x32, the size_t argument may be passed
1415 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1416 32 bits. When it happened with the sign bit of RDX register set,
1417 memcmp gave the wrong result since it treated the size argument as
1418 zero. Reported by H.J. Lu.
1420 CVE-2019-9169: Attempted case-insensitive regular-expression match
1421 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1422 over-read. Reported by Hongxu Chen.
1424 The following bugs are resolved with this release:
1426 [2872] locale: Transliteration Cyrillic -> ASCII fails
1427 [6399] libc: gettid() should have a wrapper
1428 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1429 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1430 [17396] localedata: globbing for locale by [[.collating-element.]]
1431 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1432 [18465] malloc: memusagestat is built using system C library
1433 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1434 invalid input drops valid char
1435 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1436 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1437 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1438 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1439 [23352] malloc: __malloc_check_init still defined in public header
1441 [23403] nptl: Wrong alignment of TLS variables
1442 [23501] libc: nftw() doesn't return dangling symlink's inode
1443 [23733] malloc: Check the count before calling tcache_get()
1444 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1446 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1447 [23844] nptl: pthread_rwlock_trywrlock results in hang
1448 [23983] argparse: Missing compat versions of argp_failure and argp_error
1449 for long double = double
1450 [23984] libc: Missing compat versions of err.h and error.h functions for
1451 long double = double
1452 [23996] localedata: Dutch salutations
1453 [24040] libc: riscv64: unterminated call chain in __thread_start
1454 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1456 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1457 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1459 [24114] regex: regexec buffer read overrun in "grep -i
1460 '\(\(\)*.\)*\(\)\(\)\1'"
1461 [24122] libc: Segfaults if 0 returned from la_version
1462 [24153] stdio: Some input functions do not react to stdin assignment
1463 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1464 RDX is set) (CVE-2019-7309)
1465 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1466 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1467 not the default "nor"
1468 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1469 false positives, change to modern flexible array
1470 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1471 instructions while maintaining the robust mutex list due to missing
1473 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1474 unnecessary librt dependencies
1475 [24200] localedata: Revert first_weekday removal in en_IE locale
1476 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1477 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1478 [24216] malloc: Check for large bin list corruption when inserting
1480 [24228] stdio: old x86 applications that use legacy libio crash on exit
1481 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1483 [24293] localedata: Missing Minguo calendar support for TW locales
1484 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1485 tt_RU (Tatar) locale
1486 [24307] localedata: Update locale data to Unicode 12.0.0
1487 [24323] dynamic-link: dlopen should not be able open PIE objects
1488 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1489 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1490 tt_RU (Tatar) locale
1491 [24370] localedata: Add lang_name for tt_RU locale
1492 [24372] locale: Binary locale files are not architecture independent
1493 [24394] time: strptime %Ey mis-parses final year of era
1494 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1496 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1498 [24531] malloc: Malloc tunables give tcache assertion failures
1499 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1501 [24535] localedata: Update locale data to Unicode 12.1.0
1502 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1503 kernels and break testing
1504 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1505 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1506 [-Werror=format-overflow=]
1507 [24570] libc: alpha: compat msgctl uses __IPC_64
1508 [24584] locale: Data race in __wcsmbs_clone_conv
1509 [24588] stdio: Remove codecvt vtables from libio
1510 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1512 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1513 [24632] stdio: Old binaries which use freopen with default stdio handles
1515 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1517 [24652] localedata: szl_PL spelling correction
1518 [24695] nss: nss_db: calling getpwent after endpwent crashes
1519 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1520 in /etc/nsswitch.conf
1521 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1522 [24740] libc: getdents64 type confusion
1523 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1524 always implemented in the same library
1525 [24744] libc: Remove copy_file_range emulation
1526 [24757] malloc: memusagestat is linked against system libpthread
1527 [24794] libc: Partial test suite run builds corrupt test-in-container
1535 * The getcpu wrapper function has been added, which returns the currently
1536 used CPU and NUMA node. This function is Linux-specific.
1538 * A new convenience target has been added for distribution maintainers
1539 to build and install all locales as directories with files. The new
1540 target is run by issuing the following command in your build tree:
1541 'make localedata/install-locale-files', with an optional DESTDIR
1542 to set the install root if you wish to install into a non-default
1543 configured location.
1545 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1547 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1548 for _GNU_SOURCE, to match BSD environments.
1550 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1551 indicates that it will abort the transaction prior to entering the kernel
1552 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1553 suspended, and this caused some undefined side-effects issues by aborting
1554 transactions manually. Glibc avoided it by abort transactions manually on
1555 each syscall, but it lead to performance issues on newer kernels where the
1556 HTM state is saved and restore lazily (the state being saved even when the
1557 process actually does not use HTM).
1559 * The functions posix_spawn_file_actions_addchdir_np and
1560 posix_spawn_file_actions_addfchdir_np have been added, enabling
1561 posix_spawn and posix_spawnp to run the new process in a different
1562 directory. These functions are GNU extensions. The function
1563 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1566 * The popen and system do not run atfork handlers anymore (BZ#17490).
1567 Although it is a possible POSIX violation, the POSIX rationale in
1568 pthread_atfork documentation regarding atfork handlers is to handle
1569 inconsistent mutex state after a fork call in a multi-threaded process.
1570 In both popen and system there is no direct access to user-defined mutexes.
1572 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1573 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1575 - C-SKY ABIV2 soft-float little-endian
1576 - C-SKY ABIV2 hard-float little-endian
1578 * strftime's default formatting of a locale's alternative year (%Ey)
1579 has been changed to zero-pad the year to a minimum of two digits,
1580 like "%y". This improves the display of Japanese era years during
1581 the first nine years of a new era, and is expected to be harmless
1582 for all other locales (only Japanese locales regularly have
1583 alternative year numbers less than 10). Zero-padding can be
1584 overridden with the '_' or '-' flags (which are GNU extensions).
1586 * As a GNU extension, the '_' and '-' flags can now be applied to
1587 "%EY" to control how the year number is formatted; they have the
1588 same effect that they would on "%Ey".
1590 Deprecated and removed features, and other changes affecting compatibility:
1592 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1593 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1595 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1596 in <sys/procfs.h>, has been corrected to match the type actually used by
1597 the Linux kernel. This affects the size and layout of that structure on
1598 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1600 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1601 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1602 defined in <sys/procfs.h>, has been corrected to match the type actually
1603 used by the Linux kernel. This affects the size and layout of those
1606 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1607 meant to scan a string and allocate space for it with malloc, is now
1608 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1609 defined. This extension conflicts with C99's use of '%a' to scan a
1610 hexadecimal floating-point number, which is now available to programs
1611 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1613 POSIX.1-2008 includes the feature of allocating a buffer for string input
1614 with malloc, using the modifier letter 'm' instead. Programs using
1615 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1616 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1617 C99 '%a' no longer need to avoid _GNU_SOURCE.
1619 GCC's -Wformat warnings can detect most uses of this extension, as long
1620 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1621 __attribute__ ((format (scanf, ...))).
1623 Changes to build and runtime requirements:
1625 * Python 3.4 or later is required to build the GNU C Library.
1627 * On most architectures, GCC 5 or later is required to build the GNU C
1628 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1630 Older GCC versions and non-GNU compilers are still supported when
1631 compiling programs that use the GNU C Library.
1633 Security related changes:
1635 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1636 denial of service due to resource exhaustion when processing getaddrinfo
1637 calls with crafted host names. Reported by Guido Vranken.
1639 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1640 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1641 happened, accessing the 32-bit size_t value as the full 64-bit register
1642 in the assembly string/memory functions would cause a buffer overflow.
1643 Reported by H.J. Lu.
1645 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1646 addresses with arbitrary trailing characters, potentially leading to data
1647 or command injection issues in applications.
1649 The following bugs are resolved with this release:
1651 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1652 [10496] localedata: 12h time representation in multiple locales faulty
1653 [10797] localedata: it_IT locale numeric does not have a separator for
1655 [11319] libc: dprintf doesn't handle errors properly
1656 [16346] time: mktime: potentially unsafe use of localtime_offset
1657 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1659 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1660 posix_spawn_file_actions_addfchdir_np
1661 [17426] localedata: Indian locales: set the correct date format
1662 [17490] stdio: popen should not invoke atfork handlers
1663 [17783] libc: TIOCSER_TEMT conditions inconsistent
1664 [18040] regex: use-after-free in regexec/get_subexp
1665 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1666 [20018] network: getaddrinfo should reject IP addresses with trailing
1667 characters (CVE-2016-10739)
1668 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1669 [20271] libc: Missing "\n" in __libc_fatal calls
1670 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1671 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1672 pointer argument is non-NULL
1673 [21037] stdio: open_memstream and freopen
1674 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1675 [21716] time: Crash in glibc's mktime in low-memory situations
1676 [22834] stdio: Subprocess forked by popen may crash in Linux when
1677 multithreads call popen
1678 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1679 and pthread_create fails.
1680 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1681 [23125] libc: riscv64: endless loop when throwing an exception from a
1683 [23275] nptl: Race in pthread_mutex_lock while promoting to
1684 PTHREAD_MUTEX_ELISION_NP.
1685 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1687 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1689 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1691 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1692 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1694 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1695 [23521] nss: get_next_alias nss_files file stream leak
1696 [23538] nptl: Hang in pthread_cond_broadcast
1697 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1698 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1699 [23579] libc: Errors misreported in preadv2
1700 [23597] build: support/test-container.c doesn't work with different
1702 [23603] time: mktime signed integer overflow on large timestamps
1703 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1704 [23614] libc: powerpc: missing CFI register information in __mpn_*
1706 [23637] string: Generic strstr/strcasestr fails with huge needles
1707 [23640] libc: no way to easily clear FD_CLOEXEC in
1708 posix_spawn_file_actions_adddup2()
1709 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1711 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1713 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1714 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1715 bits/types/struct_rusage.h
1716 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1718 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1720 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1721 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1722 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1724 [23724] localedata: Albanian date formats are incorrect
1725 [23735] math: libnldbl_nonshared.a references internal libm symbols
1726 [23740] localedata: kl_GL: Month names and date formats need update
1727 [23744] regex: regex refactorings to remove BE, avoid duplication
1728 [23745] time: mktime fix for Gnulib + coreutils
1729 [23758] time: Improve the width of alternate representation for year in
1731 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1732 [23789] time: mktime does not set errno on failure
1733 [23791] localedata: Wrong monetary format for ca_ES locale
1734 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1735 [23794] locale: c16rtomb does not handle surrogate pairs
1736 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1737 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1738 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1739 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1740 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1741 [23862] libc: [sh] missing kernel-features.h undefines
1742 [23864] libc: [riscv] missing kernel-features.h undefines
1743 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1744 [23907] malloc: Incorrect double-free malloc tcache check disregards
1746 [23913] libc: off-by-one in function maybe_script_execute in
1747 sysdeps/posix/spawni.c
1748 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1749 [23923] locale: Add --no-hard-links option to localedef
1750 [23927] network: Linux if_nametoindex() does not close descriptor
1752 [23961] math: powf can overflow to inf without setting errno in non-
1753 nearest rounding mode
1754 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1755 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1756 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1757 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1758 [24011] localedata: Fixed small type in comment for locale bs_BA
1759 [24018] libc: gettext() may return NULL
1760 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1761 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1762 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1764 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1765 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1767 [24046] localedata: en_US locale doesn't define date_fmt
1768 [24063] manual: @var{errno} should be @code{errno}
1769 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1770 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1772 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1774 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1776 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1778 [24112] network: Do not send DNS queries for non-host names (where all
1779 answers will be rejected)
1780 [24130] libc: alpha __remqu corrupts $f3 register
1787 * The localization data for ISO 14651 is updated to match the 2016
1788 Edition 4 release of the standard, this matches data provided by
1789 Unicode 9.0.0. This update introduces significant improvements to the
1790 collation of Unicode characters. This release deviates slightly from
1791 the standard in that the collation element ordering for lowercase and
1792 uppercase LATIN script characters is adjusted to ensure that regular
1793 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1794 is not matched by [a-z]. With the update many locales have been
1795 updated to take advantage of the new collation information. The new
1796 collation information has increased the size of the compiled locale
1797 archive or binary locales.
1799 * The GNU C Library can now be compiled with support for Intel CET, AKA
1800 Intel Control-flow Enforcement Technology. When the library is built
1801 with --enable-cet, the resulting glibc is protected with indirect
1802 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1803 compatible with all existing executables and shared libraries. This
1804 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1805 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1806 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1807 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1808 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1809 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1812 * The GNU C Library now has correct support for ABSOLUTE symbols
1813 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1814 relocated incorrectly or in some cases discarded. The GNU linker can
1815 make use of the newer semantics, but it must communicate it to the
1816 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1817 field) to indicate such support is required.
1819 * Unicode 11.0.0 Support: Character encoding, character type info, and
1820 transliteration tables are all updated to Unicode 11.0.0, using
1821 generator scripts contributed by Mike FABIAN (Red Hat).
1823 * <math.h> functions that round their results to a narrower type are added
1824 from TS 18661-1:2014 and TS 18661-3:2015:
1826 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1827 fMxaddfNx functions.
1829 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1830 fMxsubfNx functions.
1832 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1833 fMxmulfNx functions.
1835 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1836 fMxdivfNx functions.
1838 * Two grammatical forms of month names are now supported for the following
1839 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1840 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1841 support two grammatical forms in abbreviated month names: Catalan, Greek,
1844 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1845 include the support for two grammatical forms of month names.
1847 * Building and running on GNU/Hurd systems now works without out-of-tree
1850 * The renameat2 function has been added, a variant of the renameat function
1851 which has a flags argument. If the flags are zero, the renameat2 function
1852 acts like renameat. If the flag is not zero and there is no kernel
1853 support for renameat2, the function will fail with an errno value of
1854 EINVAL. This is different from the existing gnulib function renameatu,
1855 which performs a plain rename operation in case of a RENAME_NOREPLACE
1856 flags and a non-existing destination (and therefore has a race condition
1857 that can clobber the destination inadvertently).
1859 * The statx function has been added, a variant of the fstatat64
1860 function with an additional flags argument. If there is no direct
1861 kernel support for statx, glibc provides basic stat support based on
1862 the fstatat64 function.
1864 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1865 library if installed. libidn2 version 2.0.5 or later is recommended. If
1866 libidn2 is not available, internationalized domain names are not encoded
1867 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1868 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1869 with an encoding error.) Flags which used to change the IDN encoding and
1870 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1871 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1872 deprecated. They no longer have any effect.
1874 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1875 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1876 range of ELF gABI expressions including such constructs as
1877 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1878 have been further restricted, and where in the past a dynamic string
1879 token sequence may have been interpreted as a literal string it will
1880 now cause a load failure. These load failures were always considered
1881 unspecified behaviour from the perspective of the dynamic loader, and
1882 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1883 results in a load failure now.
1885 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1886 implementation includes all the standard functions provided by
1889 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1890 thrd_detach, thrd_exit, and thrd_join for thread management.
1892 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1893 mtx_destroy for mutual exclusion.
1895 - call_once for function call synchronization.
1897 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1898 cnd_wait for conditional variables.
1900 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1902 Application developers must link against libpthread to use ISO C threads.
1904 Deprecated and removed features, and other changes affecting compatibility:
1906 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1907 installed. Software that was using either header should be updated to
1908 use standard <stdio.h> interfaces instead.
1910 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1911 This was never required by the C standard, and the macros just expanded
1912 to call alternative names for the same functions. If you hoped getc and
1913 putc would provide performance improvements over fgetc and fputc, instead
1914 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1915 necessary, flockfile and funlockfile.
1917 * All stdio functions now treat end-of-file as a sticky condition. If you
1918 read from a file until EOF, and then the file is enlarged by another
1919 process, you must call clearerr or another function with the same effect
1920 (e.g. fseek, rewind) before you can read the additional data. This
1921 corrects a longstanding C99 conformance bug. It is most likely to affect
1922 programs that use stdio to read interactive input from a terminal.
1925 * The macros 'major', 'minor', and 'makedev' are now only available from
1926 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1927 headers that happen to include <sys/types.h>. These macros are rarely
1928 used, not part of POSIX nor XSI, and their names frequently collide with
1929 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1930 further explanation.
1932 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1933 these macros should first include <sys/types.h>, and then include
1934 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1936 * The tilegx*-*-linux-gnu configurations are no longer supported.
1938 * The obsolete function ustat is no longer available to newly linked
1939 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1940 function has been deprecated in favor of fstatfs and statfs.
1942 * The obsolete function nfsservctl is no longer available to newly linked
1943 binaries. This function was specific to systems using the Linux kernel
1944 and could not usefully be used with the GNU C Library on systems with
1945 version 3.1 or later of the Linux kernel.
1947 * The obsolete function name llseek is no longer available to newly linked
1948 binaries. This function was specific to systems using the Linux kernel
1949 and was not declared in a header. Programs should use the lseek64 name
1950 for this function instead.
1952 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1953 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1954 previously selected by them is now always enabled.
1956 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1957 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1958 restriction (rejecting '_' in host names, among other things) has been
1959 removed, for increased compatibility with non-IDN name resolution.
1961 * The fcntl function now have a Long File Support variant named fcntl64. It
1962 is added to fix some Linux Open File Description (OFD) locks usage on non
1963 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1964 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1965 locks act as a cancellation entrypoint.
1967 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1968 ecb_crypt, and des_setparity are no longer available to newly linked
1969 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1970 longer installed. These functions encrypted and decrypted data with the
1971 DES block cipher, which is no longer considered secure. Software that
1972 still uses these functions should switch to a modern cryptography library,
1975 * Reflecting the removal of the encrypt and setkey functions above, the
1976 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1977 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1980 * The obsolete function fcrypt is no longer available to newly linked
1981 binaries. It was just another name for the standard function crypt,
1982 and it has not appeared in any header file in many years.
1984 * We have tentative plans to hand off maintenance of the passphrase-hashing
1985 library, libcrypt, to a separate development project that will, we hope,
1986 keep up better with new passphrase-hashing algorithms. We will continue
1987 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1988 'crypt_r' should not need to change at all; however, distributions will
1989 need to install <crypt.h> and libcrypt from a separate project.
1991 In this release, if the configure option --disable-crypt is used, glibc
1992 will not install <crypt.h> or libcrypt, making room for the separate
1993 project's versions of these files. The plan is to make this the default
1994 behavior in a future release.
1996 Changes to build and runtime requirements:
1998 GNU make 4.0 or later is now required to build glibc.
2000 Security related changes:
2002 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2003 been fixed by removing the glibc-internal IDNA implementation and using
2004 the system-provided libidn2 library instead. Originally reported by Hanno
2005 Böck and Christian Weisgerber.
2007 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2008 architecture could corrupt memory. Reported by Max Horn.
2010 CVE-2018-11236: Very long pathname arguments to realpath function could
2011 result in an integer overflow and buffer overflow. Reported by Alexey
2014 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2015 architecture could write beyond the target buffer, resulting in a buffer
2016 overflow. Reported by Andreas Schwab.
2018 The following bugs are resolved with this release:
2020 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2021 [6889] manual: 'PWD' mentioned but not specified
2022 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2023 when __WORDSIZE != 64
2024 [13762] regex: re_search etc. should return -2 on memory exhaustion
2025 [13888] build: /tmp usage during testing
2026 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2027 [14092] nptl: Support C11 threads
2028 [14095] localedata: Review / update collation data from Unicode / ISO
2030 [14508] libc: -Wformat warnings
2031 [14553] libc: Namespace pollution loff_t in sys/types.h
2032 [14890] libc: Make NT_PRFPREG canonical.
2033 [15105] libc: Extra PLT references with -Os
2034 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2036 [16335] manual: Feature test macro documentation incomplete and out of
2038 [16552] libc: Unify umount implementations in terms of umount2
2039 [17082] libc: htons et al.: statement-expressions prevent use on global
2040 scope with -O1 and higher
2041 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2042 [17438] localedata: pt_BR: wrong d_fmt delimiter
2043 [17662] libc: please implement binding for the new renameat2 syscall
2044 [17721] libc: __restrict defined as /* Ignore */ even in c11
2045 [17979] libc: inconsistency between uchar.h and stdint.h
2046 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2047 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2048 horrible machine code)
2049 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2051 [18471] libc: llseek should be a compat symbol
2052 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2054 [18991] nss: nss_files skips large entry in database
2055 [19239] libc: Including stdlib.h ends up with macros major and minor being
2057 [19463] libc: linknamespace failures when compiled with -Os
2058 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2059 [19527] locale: Normalized charset name not recognized by setlocale
2060 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2061 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2063 [19728] network: out of bounds stack read in libidn function
2064 idna_to_ascii_4i (CVE-2016-6261)
2065 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2066 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2067 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2069 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2070 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2071 [20419] dynamic-link: files with large allocated notes crash in
2073 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2074 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2075 [20980] manual: CFLAGS environment variable replaces vital options
2076 [21163] regex: Assertion failure in pop_fail_stack when executing a
2077 malformed regexp (CVE-2015-8985)
2078 [21234] manual: use of CFLAGS makes glibc detect no optimization
2079 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2080 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2081 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2082 [21508] locale: intl/tst-gettext failure with latest msgfmt
2083 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2084 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2085 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2087 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2089 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2090 [22247] network: Integer overflow in the decode_digit function in
2091 puny_decode.c in libidn (CVE-2017-14062)
2092 [22342] nscd: NSCD not properly caching netgroup
2093 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2094 [22550] localedata: es_ES locale (and other es_* locales): collation
2095 should treat ñ as a primary different character, sync the collation
2096 for Spanish with CLDR
2097 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2098 by gcc configured with --enable-default-pie
2099 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2100 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2101 crossing 2GB threshold (CVE-2017-18269)
2102 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2104 [22735] time: Misleading typo in time.h source comment regarding
2106 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2107 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2108 `__assert_perror_fail ()' to `__assert_fail_base ()'
2109 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2111 [22786] libc: Stack buffer overflow in realpath() if input size is close
2112 to SSIZE_MAX (CVE-2018-11236)
2113 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2114 through an absolute DT_NEEDED path
2115 [22792] build: tcb-offsets.h dependency dropped
2116 [22797] libc: pkey_get() uses non-reserved name of argument
2117 [22807] libc: PTRACE_* constants missing for powerpc
2118 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2119 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2120 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2121 [22848] localedata: ca_ES: update date definitions from CLDR
2122 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2123 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2124 [22896] localedata: Update locale data for an_ES
2125 [22902] math: float128 test failures with GCC 8
2126 [22918] libc: multiple common of `__nss_shadow_database'
2127 [22919] libc: sparc32: backtrace yields infinite backtrace with
2129 [22926] libc: FTBFS on powerpcspe
2130 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2132 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2133 [22947] libc: FAIL: misc/tst-preadvwritev2
2134 [22963] localedata: cs_CZ: Add alternative month names
2135 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2136 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2137 [22998] dynamic-link: execstack tests are disabled when SELinux is
2139 [23005] network: Crash in __res_context_send after memory allocation
2141 [23007] math: strtod cannot handle -nan
2142 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2143 [23036] regex: regex equivalence class regression
2144 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2145 [23069] libc: sigaction broken on riscv64-linux-gnu
2146 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2147 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2148 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2149 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2150 and libc build with -Os)
2151 [23140] localedata: More languages need two forms of month names
2152 [23145] libc: _init/_fini aren't marked as hidden
2153 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2154 [23171] math: C++ iseqsig for long double converts arguments to double
2155 [23178] nscd: sudo will fail when it is run in concurrent with commands
2156 that changes /etc/passwd
2157 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2159 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2160 [23208] localedata: New locale - Lower Sorbian (dsb)
2161 [23233] regex: Memory leak in build_charclass_op function in file
2163 [23236] stdio: Harden function pointers in _IO_str_fields
2164 [23250] nptl: Offset of __private_ss differs from GCC
2165 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2166 -mtune=generic -mfpmath=sse
2167 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2169 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2170 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2172 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2173 [23277] math: nan function should not have const attribute
2174 [23279] math: scanf and strtod wrong for some hex floating-point
2175 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2177 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2178 [23303] build: undefined reference to symbol
2179 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2180 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2182 [23313] stdio: libio vtables validation and standard file object
2184 [23329] libc: The __libc_freeres infrastructure is not properly run across
2186 [23349] libc: Various glibc headers no longer compatible with
2188 [23351] malloc: Remove unused code related to heap dumps and malloc
2190 [23363] stdio: stdio-common/tst-printf.c has non-free license
2191 [23396] regex: Regex equivalence regression in single-byte locales
2192 [23422] localedata: oc_FR: More updates of locale data
2193 [23442] build: New warning with GCC 8
2194 [23448] libc: Out of bounds access in IBM-1390 converter
2195 [23456] libc: Wrong index_cpu_LZCNT
2196 [23458] build: tst-get-cpu-features-static isn't added to tests
2197 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2199 [23467] dynamic-link: x86/CET: A property note parser bug
2206 * The GNU C Library can now be compiled with support for building static
2207 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2208 executables are like static executables but can be loaded at any address
2209 and provide additional security hardening benefits at the cost of some
2210 memory and performance. When the library is built with --enable-static-pie
2211 the resulting libc.a is usable with GCC 8 and above to create static PIE
2212 executables using the GCC option '-static-pie'. This feature is currently
2213 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2214 aarch64 with binutils 2.30 or later.
2216 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2217 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2220 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2222 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2224 * In order to support faster and safer process termination the malloc API
2225 family of functions will no longer print a failure address and stack
2226 backtrace after detecting heap corruption. The goal is to minimize the
2227 amount of work done after corruption is detected and to avoid potential
2228 security issues in continued process execution. Reducing shutdown time
2229 leads to lower overall process restart latency, so there is benefit both
2230 from a security and performance perspective.
2232 * The abort function terminates the process immediately, without flushing
2233 stdio streams. Previous glibc versions used to flush streams, resulting
2234 in deadlocks and further data corruption. This change also affects
2235 process aborts as the result of assertion failures.
2237 * On platforms where long double has the IEEE binary128 format (aarch64,
2238 alpha, mips64, riscv, s390 and sparc), the math library now implements
2239 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2240 These are the same interfaces added in version 2.26 for some platforms where
2241 this format is supported but is not the format of long double.
2243 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2244 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2245 implements interfaces for that type, as defined by ISO/IEC TS
2246 18661-3:2015. These are corresponding interfaces to those supported for
2249 * The math library now implements interfaces for the _Float32, _Float64 and
2250 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2251 corresponding interfaces to those supported for _Float128.
2253 * glibc now implements the memfd_create and mlock2 functions on Linux.
2255 * Support for memory protection keys was added. The <sys/mman.h> header now
2256 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2259 * The copy_file_range function was added.
2261 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2263 * The ldconfig utility now processes `include' directives using the C/POSIX
2264 collation ordering. Previous glibc versions used locale-specific
2265 ordering, the change might break systems that relied on that.
2267 * Support for two grammatical forms of month names has been added.
2268 In a call to strftime, the "%B" and "%b" format specifiers will now
2269 produce the grammatical form required when the month is used as part
2270 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2271 required when the month is named by itself. For instance, in Greek
2272 and in many Slavic and Baltic languages, "%B" will produce the month
2273 in genitive case, and "%OB" will produce the month in nominative case.
2275 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2276 are all valid and will all accept any known form of month
2277 name---standalone or complete, abbreviated or full. In a call to
2278 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2279 the strings used by "%B" and "%b", respectively. New query
2280 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2281 used by "%OB" and "%Ob", respectively.
2283 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2284 define the strings for %OB and %Ob, respectively; these have the
2285 same syntax as "mon" and "abmon". These arrays are optional; if they
2286 are not provided then they have the same content as "mon" and "abmon",
2289 These features are provided for locales which define "alt_mon" and/or
2290 "ab_alt_mon" in their locale source data. This release includes such
2291 alternative month name data for the following languages: Belarusian,
2292 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2294 This feature is currently a GNU extension, but it is expected to
2295 be added to the next revision of POSIX, and it is also already
2296 available on some BSD-derived operating systems.
2298 This feature will cause existing statically compiled applications
2299 to fail to load locales and fall back to the builtin C/POSIX locales.
2300 See notes below for other changes affecting compatibility.
2302 * Support for the RISC-V ISA running on Linux has been added. This port
2303 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2304 for the following ISA and ABI pairs:
2310 Deprecated and removed features, and other changes affecting compatibility:
2312 * Statically compiled applications attempting to load locales compiled for the
2313 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2314 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2315 support for two grammatical forms of the month names, also extends the locale
2316 data binary format. Static applications needing locale support must be
2317 recompiled to match the runtime and data they are deployed with. In some
2318 distributions there is an upgrade window where dynamically linked applications
2319 may use a new library but the old locale data and also fall back to the
2320 builtin C/POSIX locales; restarting the application process is sufficient to
2323 * Support for statically linked applications which call dlopen is deprecated
2324 and will be removed in a future version of glibc. Applications which call
2325 dlopen need to be linked dynamically instead.
2327 * Support for old programs which use internal stdio data structures and
2328 functions is deprecated. This includes programs which use the C++ streams
2329 provided by libstdc++ in GCC 2.95. Programs which use the internal
2330 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2331 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2332 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2333 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2334 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2335 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2336 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2337 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2338 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2339 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2340 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2341 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2342 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2343 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2344 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2345 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2346 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2347 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2348 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2349 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2350 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2351 future version of glibc. Unlike other symbol removals, these old
2352 applications will not be supported using compatibility symbols.
2354 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2355 defined by <sys/ptrace.h>.
2357 * libm no longer supports SVID error handling (calling a user-provided
2358 matherr function on error) or the _LIB_VERSION variable to control error
2359 handling. (SVID error handling and the _LIB_VERSION variable still work
2360 for binaries linked against older versions of the GNU C Library.) The
2361 libieee.a library is no longer provided. math.h no longer defines struct
2362 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2363 TLOSS, PLOSS and HUGE.
2365 * The libm functions pow10, pow10f and pow10l are no longer supported for
2366 new programs. Programs should use the standard names exp10, exp10f and
2367 exp10l for these functions instead.
2369 * The mcontext_t type is no longer the same as struct sigcontext. On
2370 platforms where it was previously the same, this changes the C++ name
2371 mangling for interfaces involving this type.
2373 * The add-ons mechanism for building additional packages at the same time as
2374 glibc has been removed. The --enable-add-ons configure option is now
2377 * The --without-fp configure option is now ignored. Whether hardware
2378 floating-point instructions are used is now configured based on whether
2379 the compiler used at configure time (without any options implied by a
2380 --with-cpu= configure option) uses such instructions.
2382 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2383 the specified string can be parsed as a domain name.
2385 * In the malloc_info output, the <heap> element may contain another <aspace>
2386 element, "subheaps", which contains the number of sub-heaps.
2388 * The libresolv function p_secstodate is no longer supported for new
2391 * The tilepro-*-linux-gnu configuration is no longer supported.
2393 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2394 and will be removed in a future release. Software that is still using
2395 either header should be updated to use standard <stdio.h> interfaces
2398 libio.h was originally the header for a set of supported GNU extensions,
2399 but they have not been maintained as such in many years, they are now
2400 standing in the way of improvements to stdio, and we don't think there are
2401 any remaining external users. _G_config.h was never intended for public
2402 use, but predates the bits convention.
2404 Changes to build and runtime requirements:
2406 * bison version 2.7 or later is required to generate code in the 'intl'
2409 Security related changes:
2411 CVE-2009-5064: The ldd script would sometimes run the program under
2412 examination directly, without preventing code execution through the
2413 dynamic linker. (The glibc project disputes that this is a security
2414 vulnerability; only trusted binaries must be examined using the ldd
2417 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2418 suffered from a one-byte overflow during ~ operator processing (either
2419 on the stack or the heap, depending on the length of the user name).
2420 Reported by Tim Rühsen.
2422 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2423 would sometimes fail to free memory allocated during ~ operator
2424 processing, leading to a memory leak and, potentially, to a denial
2427 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2428 without GLOB_NOESCAPE, could write past the end of a buffer while
2429 unescaping user names. Reported by Tim Rühsen.
2431 CVE-2017-17426: The malloc function, when called with an object size near
2432 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2433 instead of NULL. This was a regression introduced with the new malloc
2434 thread cache in glibc 2.26. Reported by Iain Buclaw.
2436 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2437 to the allocation of too much memory. (This is not a security bug per se,
2438 it is mentioned here only because of the CVE assignment.) Reported by
2441 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2442 of the number of search path components. (This is not a security
2443 vulnerability per se because no trust boundary is crossed if the fix for
2444 CVE-2017-1000366 has been applied, but it is mentioned here only because
2445 of the CVE assignment.) Reported by Qualys.
2447 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2448 for AT_SECURE or SUID binaries could be used to load libraries from the
2451 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2452 succeeds without returning an absolute path due to unexpected behaviour
2453 of the Linux kernel getcwd syscall. Reported by halfdog.
2455 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2456 an object size near the value of SIZE_MAX, would return a pointer to a
2457 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2459 CVE-2018-6551: The malloc function, when called with an object size near
2460 the value of SIZE_MAX, would return a pointer to a buffer which is too
2461 small, instead of NULL.
2463 The following bugs are resolved with this release:
2465 [866] glob: glob should match dangling symlinks
2466 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2467 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2469 [5997] math: Very slow execution of sinf function
2470 [10580] localedata: hr_HR: updated locale
2471 [10871] locale: 'mon' array should contain both nominative and genitive
2473 [12349] localedata: eu_ES: incorrect thousands separator
2474 [13605] localedata: shn_MM: new Shan locale
2475 [13805] localedata: ru_RU: currency should use ',' as radix point
2476 [13953] localedata: km_KH: locale update
2477 [13994] localedata: mjw_IN: new locale
2478 [14121] build: make writes .mo files in po directory
2479 [14333] libc: Fix the race between atexit() and exit()
2480 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2481 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2483 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2484 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2485 width Latin characters
2486 [15332] localedata: es_CU: locale update
2487 [15436] stdio: Don't close or flush stdio streams on abort
2488 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2490 [16148] localedata: ca_ES: incorrect thousands separator
2491 [16750] dynamic-link: ldd should not try to execute the binaries
2493 [16777] localedata: pl_PL: incorrect thousands separator in locale
2494 [16905] localedata: hanzi: new collation
2495 [17563] localedata: cmn_TW: add hanzi collation
2496 [17750] localedata: wrong collation order of diacritics in most locales
2497 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2499 [17956] build: Build fails on missing definitions from header file
2500 nss/nss.h when Mozilla NSS is used for cryptography
2501 [18203] libc: realpath() does not handle unreachable paths correctly
2502 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2503 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2504 [18822] libc: Internal functions are called via PLT
2505 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2506 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2507 [19574] libc: glibc should support building static PIE binaries
2508 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2510 [19971] glob: glob: Do not skip entries with zero d_ino values
2511 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2512 [20008] localedata: km_KH: convert to translit_neutral
2513 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2514 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2515 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2516 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2517 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2519 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2520 they're set, wrong errors returned by gaih_inet when lookup functions
2522 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2523 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2525 [20952] localedata: yuw_PG: new locale
2526 [21084] localedata: charmaps/IBM858: new codepage
2527 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2528 [21242] libc: assert gives pedantic warning in old gcc versions
2529 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2530 __regcall calling convention
2531 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2532 [21326] libc: C99 functions are not declared for C++11 and later if
2533 _GNU_SOURCE is not predefined by g++
2534 [21457] libc: sys/ucontext.h namespace
2535 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2536 [21660] math: GCC fails to compile a formula with tgmath.h
2537 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2538 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2539 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2540 [21684] math: tgmath.h handling of complex integers
2541 [21685] math: tgmath.h handling of bit-fields
2542 [21686] math: tgmath.h handling of __int128
2543 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2545 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2547 [21750] localedata: column width of characters incompatible with classical
2549 [21754] malloc: malloc: Perform as little work as possible after heap
2550 consistency check failures
2551 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2552 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2553 [21791] string: Unused XXX_chk_XXX functions in libc.a
2554 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2556 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2558 [21845] localedata: Added new Locale bho_NP
2559 [21853] localedata: Fix abday Which looks same as day in zh_SG
2560 [21854] localedata: Added New Locale en_SC
2561 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2562 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2563 _dl_runtime_resolve_avx_slow
2564 [21885] network: getaddrinfo: gethosts does not release resolver context
2565 on memory allocation failure
2566 [21899] libc: XPG4.2 sigaction namespace
2567 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2569 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2571 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2572 errno value, causing getaddrinfo to fail
2573 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2574 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2575 instead of EAI_NODATA
2576 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2577 constant PTRACE_SEIZE_DEVEL
2578 [21930] math: C-only gcc builtins used in <math.h> isinf
2579 [21932] network: Unpaired __resolv_context_get in generic get*_r
2581 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2582 [21944] libc: sigval namespace
2583 [21951] localedata: Update hanzi collation by stroke
2584 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2585 sysdeps/x86_64/fpu/e_expf.S
2586 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2587 allocation in syscall loops)
2588 [21959] localedata: Fix Country name for xh_ZA
2589 [21960] localedata: Fix abmon for bem_ZM
2590 [21966] math: AVX2 mathvec functions use FMA without checking
2591 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2592 [21971] localedata: Added New Locale for mfe_MU
2593 [21972] libc: assert macro requires operator== (int) for its argument type
2594 [21973] math: [sparc] libm missing sqrtl compat symbol
2595 [21974] libc: Remove __bb_init_func and __bb_exit_func
2596 [21982] string: stratcliff.c: error: assuming signed overflow does not
2598 [21986] stdio: __guess_grouping is called incorrectly
2599 [21987] math: [sparc32] wrong bits/long-double.h installed
2600 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2602 [22022] localedata: Missing country_name for mni_IN
2603 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2605 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2607 [22026] locale: iconv_open: heap overflow on gconv_init failure
2608 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2609 [22035] math: [m68k] bits/math-inline.h macro namespace
2610 [22038] localedata: Fix abbreviated weeks and months for Somali
2611 [22044] localedata: Remove redundant data for Limburgish Language
2612 [22050] malloc: Linking with -lmcheck does not hook
2613 __malloc_initialize_hook correctly
2614 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2615 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2616 [22070] localedata: charmaps/UTF-8: wcwidth for
2617 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2618 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2619 Jungseong and Jongseong) should be 0
2620 [22078] nss: nss_files performance issue in multi mode
2621 [22082] math: bits/math-finite.h exp10 condition
2622 [22086] libc: pcprofiledump incorrect cross-endian condition
2623 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2624 [22095] network: Name server address allocation memory leak in resolv.conf
2626 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2628 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2629 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2631 [22111] malloc: malloc: per thread cache is not returned when thread exits
2632 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2633 [22134] libc: [linux] implement fexecve with execveat
2634 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2636 [22145] libc: ttyname() gives up too early in the face of namespaces
2637 [22146] math: C++ build issue with float128 on x86_64
2638 [22153] nptl: nptl: save error code before process termination
2639 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2640 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2641 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2642 [22165] libc: [hppa] Text relocations in libc.so
2643 [22180] libc: destructor registered via __cxa_atexit is called twice
2644 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2645 symlinks") cause "make" segfaults
2646 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2648 [22207] libc: FAIL: stdlib/test-atexit-race
2649 [22225] math: nearbyint arithmetic moved before feholdexcept
2650 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2651 [22235] math: iscanonical in C++ and float128
2652 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2653 the svid compat wrapper
2654 [22244] math: ynf and yn are wrong without the svid compat wrapper
2655 [22273] libc: Improper assert in Linux posix_spawn implementation
2656 [22284] libc: -pg -pie doesn't work
2657 [22292] locale: localedef exits with error 4 when it should be error 1
2658 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2659 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2661 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2662 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2664 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2665 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2666 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2667 [22322] libc: [mips64] wrong bits/long-double.h installed
2668 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2669 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2671 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2672 [22343] malloc: Integer overflow in posix_memalign
2673 [22347] libc: getrandom() returns the number of bytes that were copied to
2674 the buffer even though the comments say "Return 0 on success and -1 on
2676 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2677 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2679 [22370] dynamic-link: Incorrect note padding check
2680 [22375] libc: malloc returns pointer from tcache_get when should return
2681 NULL (CVE-2017-17426)
2682 [22377] math: iseqsig, float128 and C++
2683 [22382] localedata: Error in tpi_PG locale
2684 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2685 inside the ASCII printable range
2686 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2688 [22403] localedata: Slash needs escaping in some locales
2689 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2690 [22409] network: res_hnok does not accept some host names used on the
2692 [22412] network: res_dnok, res_hnok should perform syntax checks
2693 [22413] network: ns_name_pton ignores syntactically invalid trailing
2695 [22415] stdio: setvbuf can lead to invalid free/segfault
2696 [22432] build: Non-deterministic build
2697 [22439] malloc: malloc_info should compute summary statistics for all sub-
2699 [22442] network: if_nametoindex could report index for the wrong
2700 networking interface
2701 [22446] build: aliasing violation calling readlink in handle_request
2702 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2703 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2704 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2705 __nscd_hash/__nss_hash
2706 [22463] network: p_secstodate overflow handling
2707 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2708 [22478] libc: sigwait can fail with EINTR
2709 [22505] libc: ldconfig processes include directive in locale-specific
2711 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2712 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2713 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2714 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2715 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2716 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2717 same as for Croatian
2718 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2719 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2720 [22577] libc: missing newline after "cannot allocate TLS data structures
2722 [22588] manual: manual/conf.texi: missing underscore in front of
2724 [22593] math: nextafter and nexttoward are declared with const attribute
2725 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2726 [22603] string: ia64 memchr overflows internal pointer check
2727 [22605] libc: SH clone does not set the exit code correctly
2728 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2730 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2731 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2732 modified in case of success
2733 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2734 [22615] manual: manual: ambiguous wording about errno value in case of
2736 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2738 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2739 binaries or if /proc is not mounted (CVE-2017-16997)
2740 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2741 [22630] build: $(no-pie-ldflag) is no longer effective
2742 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2743 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2744 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2745 [22637] nptl: guard size is subtracted from thread stack size instead of
2747 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2748 [22657] localedata: hu_HU: Avoid double space in date
2749 [22660] math: fmax, fmin sNaN handling on alpha
2750 [22664] libc: New warning of GCC8
2751 [22665] math: alpha: ceil and floor raise inexact exceptions
2752 [22666] math: alpha: trunc raise inexact exceptions
2753 [22667] libc: makecontext lacks stack alignment on i386
2754 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2755 [22679] libc: getcwd(3) can succeed without returning an absolute path
2757 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2758 elision and tunables
2759 [22687] math: [powerpc-nofpu] complex long double functions spurious
2761 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2762 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2763 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2765 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2766 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2768 [22701] nis: Incomplete removal of libnsl
2769 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2770 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2771 [22715] dynamic-link: FAIL: elf/tst-audit10
2772 [22719] libc: Backtrace tests fail on hppa
2773 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2774 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2775 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2776 before the first call to crypt_r () in crypt/badsalttest.c
2783 * A per-thread cache has been added to malloc. Access to the cache requires
2784 no locks and therefore significantly accelerates the fast path to allocate
2785 and free small amounts of memory. Refilling an empty cache requires locking
2786 the underlying arena. Performance measurements show significant gains in a
2787 wide variety of user workloads. Workloads were captured using a special
2788 instrumented malloc and analyzed with a malloc simulator. Contributed by
2789 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2791 * Unicode 10.0.0 Support: Character encoding, character type info, and
2792 transliteration tables are all updated to Unicode 10.0.0, using
2793 generator scripts contributed by Mike FABIAN (Red Hat).
2794 These updates cause user visible changes, especially the changes in
2795 wcwidth for many emoji characters cause problems when emoji sequences
2796 are rendered with pango, see for example:
2797 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2799 * Collation of Hungarian has been overhauled and is now consistent with "The
2800 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2803 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2805 - The GNU C Library will now detect when /etc/resolv.conf has been
2806 modified and reload the changed configuration. The new resolver option
2807 “no-reload” (RES_NORELOAD) disables this behavior.
2809 - The GNU C Library now supports an arbitrary number of search domains
2810 (configured using the “search” directive in /etc/resolv.conf);
2811 previously, there was a hard limit of six domains. For backward
2812 compatibility, applications that directly modify the ‘_res’ global
2813 object are still limited to six search domains.
2815 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2816 Library will now randomly pick a name server from the configuration as a
2817 starting point. (Previously, the second name server was always used.)
2819 * The tunables feature is now enabled by default. This allows users to tweak
2820 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2822 * New function reallocarray, which resizes an allocated block (like realloc)
2823 to the product of two sizes, with a guaranteed clean failure upon integer
2824 overflow in the multiplication. Originally from OpenBSD, contributed by
2825 Dennis Wölfing and Rüdiger Sonderfeld.
2827 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2828 These are extended versions of preadv and pwritev, respectively, taking an
2829 additional flags argument. The set of supported flags depends on the
2830 running kernel; full support currently requires kernel 4.7 or later.
2832 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2833 create a new session ID for the spawned process. This feature is
2834 scheduled to be added to the next major revision of POSIX; for the time
2835 being, it is available under _GNU_SOURCE.
2837 * errno.h is now safe to use from C-preprocessed assembly language on all
2838 supported operating systems. In this context, it will only define the
2839 Exxxx constants, as preprocessor macros expanding to integer literals.
2841 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2842 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2843 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2844 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2846 To compile programs that use this feature, the compiler must support
2847 128-bit floating point with the type name _Float128 (as defined by TS
2848 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2849 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2850 must be defined to make the new interfaces visible.
2852 The new functions and macros correspond to those present for other
2853 floating-point types (except for a few obsolescent interfaces not
2854 supported for the new type), with F128 or f128 suffixes; for example,
2855 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2856 printf or scanf formats for the new type; the strfromf128 and strtof128
2857 interfaces should be used instead.
2859 Deprecated and removed features, and other changes affecting compatibility:
2861 * The synchronization that pthread_spin_unlock performs has been changed to
2862 now be equivalent to a C11 atomic store with release memory order to the
2863 spin lock's memory location. Previously, several (but not all)
2864 architectures used stronger synchronization (e.g., containing what is
2865 often called a full barrier). This change can improve performance, but
2866 may affect odd fringe uses of spin locks that depend on the previous
2867 behavior (e.g., using spin locks as atomic variables to try to implement
2868 Dekker's mutual exclusion algorithm).
2870 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2873 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2874 will only be built and installed when the GNU C Library is configured with
2875 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2876 as TIRPC or rpcsvc-proto, to be used.
2878 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2879 libnss_compat, are deprecated, and will not be built or installed by
2882 The NIS(+) support library, libnsl, is also deprecated. By default, a
2883 compatibility shared library will be built and installed, but not headers
2884 or development libraries. Only a few NIS-related programs require this
2885 library. (In particular, the GNU C Library has never required programs
2886 that use 'gethostbyname' to be linked with libnsl.)
2888 Replacement implementations based on TIRPC, which additionally support
2889 IPv6, are available from <https://github.com/thkukuk/>. The configure
2890 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2891 name service modules, to be built and installed.
2893 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2894 support is enabled, the configured recursive resolver must support EDNS.
2895 (Responding to EDNS-enabled queries with responses which are not
2896 EDNS-enabled is fine, but FORMERR responses are not.)
2898 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2899 servers have not supported this opcode for a long time.
2901 * The _res_opcodes variable has been removed from libresolv. It had been
2902 exported by accident.
2904 * <string.h> no longer includes inline versions of any string functions,
2905 as this kind of optimization is better done by the compiler. The macros
2906 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2908 * The nonstandard header <xlocale.h> has been removed. Most programs should
2909 use <locale.h> instead. If you have a specific need for the definition of
2910 locale_t with no other declarations, please contact
2911 libc-alpha@sourceware.org and explain.
2913 * The obsolete header <sys/ultrasound.h> has been removed.
2915 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2917 * The obsolete function cfree has been removed. Applications should use
2920 * The stack_t type no longer has the name struct sigaltstack. This changes
2921 the C++ name mangling for interfaces involving this type.
2923 * The ucontext_t type no longer has the name struct ucontext. This changes
2924 the C++ name mangling for interfaces involving this type.
2926 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2927 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2928 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2929 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2930 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2931 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2932 fpregset_t type no longer has the name struct fpu. This changes the C++
2933 name mangling for interfaces involving those types.
2935 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2936 synced with the kernel:
2938 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2939 are not supported on this architecture and have been removed.
2941 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2942 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2943 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2945 Programs that assume the GET/SETREGS ptrace requests are universally
2946 available will now fail to build, instead of malfunctioning at runtime.
2948 Changes to build and runtime requirements:
2950 * Linux kernel 3.2 or later is required at runtime, on all architectures
2951 supported by that kernel. (This is a change from version 2.25 only for
2954 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2956 * On most architectures, GCC 4.9 or later is required to build the GNU C
2957 Library. On powerpc64le, GCC 6.2 or later is required.
2959 Older GCC versions and non-GNU compilers are still supported when
2960 compiling programs that use the GNU C Library. (We do not know exactly
2961 how old, and some GNU extensions to C may be _de facto_ required. If you
2962 are interested in helping us make this statement less vague, please
2963 contact libc-alpha@sourceware.org.)
2965 Security related changes:
2967 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2968 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2970 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2971 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2973 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2974 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2977 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2978 fixed (CVE-2017-12133).
2980 The following bugs are resolved with this release:
2982 [984] network: Respond to changed resolv.conf in gethostbyname
2983 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2984 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2986 [12189] libc: __stack_chk_fail should not attempt a backtrace
2988 [14096] time: Race condition on timezone/tst-timezone.out
2989 [14172] localedata: az_IR: new locale
2990 [14995] build: glibc fails to build if gold is the default linker, even if
2992 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2993 [16637] network: inet_pton function is accepting IPv6 with bad format
2994 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2995 x86 and other generic code
2996 [16875] localedata: ko_KR: fix lang_name
2997 [17225] localedata: ar_SY: localized month names for May and June are
2999 [17297] localedata: da_DK: wrong date_fmt string
3000 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3001 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3002 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3003 [19066] localedata: ar_SA abbreviated day and month names are in English
3004 [19569] network: resolv: Support an arbitrary number of search domains
3005 [19570] network: Implement random DNS server selection in the stub
3007 [19838] locale: localedef fails on PA-RISC
3008 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3009 order of 0D36 and 0D37
3010 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3012 [20098] libc: FAIL: debug/backtrace-tst on hppa
3013 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3015 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3017 [20313] localedata: Update locale data to Unicode 9.0
3018 [20424] manual: Document how to provide a malloc replacement
3019 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3021 [20686] locale: Add el_GR@euro to SUPPORTED.
3022 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3023 failures consistently
3024 [21015] dynamic-link: Document and fix --enable-bind-now
3025 [21016] nptl: pthread_cond support is broken on hppa
3026 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3027 frame-pointer on i386
3028 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3030 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3031 [21088] libc: Build fails with --enable-static-nss
3032 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3033 generic c code is used
3034 [21109] libc: Tunables broken on big-endian
3035 [21112] math: powf has large ulp errors with base close to 1 and exponent
3037 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3039 [21120] malloc: glibc malloc is incompatible with GCC 7
3040 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3042 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3043 (-0.0) when linking with -lieee
3044 [21171] math: log10, log2 and lgamma return incorrect results
3045 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3046 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3047 [21207] localedata: ce_RU: update weekdays from CLDR
3048 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3049 [21217] localedata: Update months from CLDR-31
3050 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3051 [21243] libc: support_delete_temp_file should issue warning for failed
3053 [21244] libc: support resolv_test_start() socket fd close should be
3055 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3056 new posix_spawn implementation
3057 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3058 leads to lower CPU frequency
3059 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3060 [21261] libc: [sparc64] bits/setjmp.h namespace
3061 [21267] network: [mips] bits/socket.h IOC* namespace
3062 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3063 [21270] libc: mmap64 silently truncates large offset values
3064 [21275] libc: posix_spawn always crashes on ia64 now
3065 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3066 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3067 [21289] libc: Incorrect declaration for 32-bit platforms with
3068 _FILE_OFFSET_BITS=64 causes build error
3069 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3070 not support gethostbyname4_r
3071 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3073 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3075 [21340] libc: Support POSIX_SPAWN_SETSID
3076 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3077 [21359] network: ns_name_pack needs additional byte in destination buffer
3078 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3079 against fragmentation attacks (CVE-2017-12132)
3080 [21369] network: resolv: Remove EDNS fallback
3081 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3083 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3084 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3085 [21393] stdio: Missing dup3 error check in freopen, freopen64
3086 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3087 [21399] localedata: Bad description for U00EC in
3088 localedata/charmaps/CP1254
3089 [21411] malloc: realloc documentation error
3090 [21426] network: sys/socket.h uio.h namespace
3091 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3092 [21445] libc: signal.h bsd_signal namespace
3093 [21455] network: Network headers stdint.h namespace
3094 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3096 [21475] network: resolv: Overlong search path is truncated mid-label
3097 [21511] libc: sigstack namespace
3098 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3099 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3100 bits/syscall.h: No such file or directory
3101 [21517] libc: struct sigaltstack namespace
3102 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3103 [21533] localedata: Update locale data to Unicode 10.0
3105 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3106 junk at end of line, first unrecognized character is `@'
3107 [21538] libc: SIG_HOLD missing for XPG4
3108 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3109 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3110 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3111 [21543] libc: sigevent namespace
3112 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3113 size for general purpose registers in mcontext_t structure
3114 [21550] libc: sigwait namespace
3115 [21552] libc: XPG4 bsd_signal namespace
3116 [21554] libc: sigpause namespace
3117 [21560] libc: sys/wait.h signal.h namespace
3118 [21561] libc: waitid namespace
3119 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3120 '/usr/include/stdlib.h': Permission denied
3121 [21575] libc: sys/wait.h missing struct rusage definition
3122 [21584] libc: sigaltstack etc namespace
3123 [21597] libc: siginterrupt namespace
3124 [21607] math: hppa: FAIL: math/test-tgmath
3125 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3127 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3128 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3129 stack and heap (CVE-2017-1000366)
3130 [21625] libc: wait3 namespace
3131 [21654] nss: Incorrect pointer alignment in NSS group merge result
3133 [21657] network: Parse interface zone id for node-local multicast
3134 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3136 [21666] libc: .symver is used on common symbol
3137 [21668] network: resolv: res_init cross-thread broadcast introduces race
3139 [21687] math: tgmath.h totalorder, totalordermag return type
3140 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3142 [21696] libc: Incorrect assumption of of __cpu_mask in
3143 posix/sched_cpucount.c
3144 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3145 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3147 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3148 leading to relocation crash
3149 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3150 `resolv_conf_matches (resp, conf)' failed.
3151 [21710] localedata: Added Samoan language locale for Samoa
3152 [21711] localedata: Pashto yesstr/nostr locale are missing
3153 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3154 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3155 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3156 [21723] localedata: yesstr/nostr missing for Chinese language locale
3157 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3159 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3161 [21728] localedata: New Locale for Tongan language
3162 [21729] localedata: incorrect LC_NAME fields for hi_IN
3163 [21733] localedata: yesstr and nostr are missing for zh_HK
3164 [21734] localedata: Missing yesstr and nostr are for kw_GB
3165 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3166 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3167 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3168 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3170 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3172 [21749] localedata: Wrong abbreviated day name (“abday”) for
3174 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3175 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3176 [21759] localedata: missing yesstr and nostr for Tigrinya
3177 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3178 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3179 [21767] localedata: Missing Bislama locales
3180 [21768] localedata: Missing yesstr and nostr for aa_ET
3181 [21770] localedata: Missing Field in li_NL
3182 [21778] nptl: Robust mutex may deadlock
3183 [21779] libc: MicroBlaze segfaults when loading libpthread
3184 [21783] localedata: Fix int_select international_call_prefixes
3185 [21784] localedata: Inconsistency in country_isbn
3186 [21788] localedata: Missing Country Postal Abbreviations
3187 [21794] localedata: Added-country_isbn-for-Italy
3188 [21795] localedata: Add/Fix country_isbn for France
3189 [21796] localedata: Added country_isbn for Republic of Korea
3190 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3191 [21799] localedata: Added int_select international_call_prefixes
3192 [21801] localedata: Added int_select international_call_prefixes
3193 [21804] nptl: Double semicolon in thread-shared-types.h
3194 [21807] localedata: LC_ADDRESS fix for pap_CW
3195 [21808] localedata: Fix LC_ADDRESS for pap_AW
3196 [21821] localedata: Added country_name in mai_IN
3197 [21822] localedata: Fix LC_TIME for mai_IN
3198 [21823] localedata: missing yesstr, nostr for sa_IN
3199 [21825] localedata: Fix name_mrs for mag_IN
3200 [21828] localedata: 2.26 changelog should mention user visible changes
3202 [21835] localedata: Added Maithili language locale for Nepal
3203 [21838] localedata: Removed redundant data for the_NP
3204 [21839] localedata: Fix LC_MONETARY for ta_LK
3205 [21844] localedata: Fix Latin characters and Months Sequence.
3206 [21848] localedata: Fix mai_NP Title Name
3211 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3212 24731-2:2010, is supported to enable declarations of functions from that
3213 TR. Note that not all functions from that TR are supported by the GNU C
3216 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3217 18661-1:2014, is supported to enable declarations of functions and macros
3218 from that TS. Note that not all features from that TS are supported by
3221 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3222 18661-4:2015, is supported to enable declarations of functions and macros
3223 from that TS. Note that most features from that TS are not supported by
3226 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3227 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3228 Since the GNU C Library defaults to a much newer revision of POSIX, this
3229 will only affect programs that specifically request an old conformance
3230 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3231 see a change in the visible declarations, but a program compiled with
3232 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3235 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3236 defined by all multithreaded code, but glibc has not required this for
3239 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3240 means that in a future release, the macros “major”, “minor”, and “makedev”
3241 will only be available from <sys/sysmacros.h>.
3243 These macros are not part of POSIX nor XSI, and their names frequently
3244 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3245 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3246 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3249 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3250 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3251 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3253 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3254 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3255 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3256 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3257 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3258 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3259 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3260 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3261 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3262 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3263 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3266 * New <math.h> features are added from TS 18661-1:2014:
3268 - Signaling NaN macros: SNANF, SNAN, SNANL.
3270 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3271 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3272 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3274 - llogb functions: the llogb, llogbf and llogbl functions, and the
3275 FP_LLOGB0 and FP_LLOGBNAN macros.
3277 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3280 - Comparison macros: iseqsig.
3282 - Classification macros: iscanonical, issubnormal, iszero.
3284 - Total order functions: totalorder, totalorderf, totalorderl,
3285 totalordermag, totalordermagf, totalordermagl.
3287 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3289 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3290 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3292 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3293 are added to libc. They convert a floating-point number into string.
3295 * Most of glibc can now be built with the stack smashing protector enabled.
3296 It is recommended to build glibc with --enable-stack-protector=strong.
3297 Implemented by Nick Alcock (Oracle).
3299 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3300 intended to be used instead of memset() to erase sensitive data after use;
3301 the compiler will not optimize out calls to explicit_bzero even if they
3302 are "unnecessary" (in the sense that no _correct_ program can observe the
3303 effects of the memory clear).
3305 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3306 to float instead of double. This does not affect the ABI of any libraries
3307 that are part of the GNU C Library, but may affect the ABI of other
3308 libraries that use this type in their interfaces.
3310 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3311 float_t and double_t types are now defined to long double instead of float
3312 and double. These options are not the default, and this does not affect
3313 the ABI of any libraries that are part of the GNU C Library, but it may
3314 affect the ABI of other libraries that use this type in their interfaces,
3315 if they are compiled or used with those options.
3317 * The getentropy and getrandom functions, and the <sys/random.h> header file
3320 * The buffer size for byte-oriented stdio streams is now limited to 8192
3321 bytes by default. Previously, on Linux, the default buffer size on most
3322 file systems was 4096 bytes (and thus remains unchanged), except on
3323 network file systems, where the buffer size was unpredictable and could be
3324 as large as several megabytes.
3326 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3327 for the Linux quota interface which predates kernel version 2.4.22 has
3330 * The malloc_get_state and malloc_set_state functions have been removed.
3331 Already-existing binaries that dynamically link to these functions will
3332 get a hidden implementation in which malloc_get_state is a stub. As far
3333 as we know, these functions are used only by GNU Emacs and this change
3334 will not adversely affect already-built Emacs executables. Any undumped
3335 Emacs executables, which normally exist only during an Emacs build, should
3336 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3338 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3339 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3340 “no-ip6-dotint” had already been the default, and support for the
3341 “ip6-dotint” option was removed from the Internet in 2006.
3343 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3344 flag from <resolv.h> have been removed. The option relied on a
3345 backwards-incompatible DNS extension which was never deployed on the
3348 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3349 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3350 They were already unimplemented.
3352 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3353 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3354 removed again from the IETF name lookup interface specification in RFC
3355 2553. Applications should use getaddrinfo instead.
3357 * DNSSEC-related declarations and definitions have been removed from the
3358 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3359 decode the data part of DNSSEC record types. Previous versions of glibc
3360 only implemented minimal support for the previous version of DNSSEC, which
3361 is incompatible with the currently deployed version.
3363 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3364 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3365 <arpa/nameser.h> header file because the distinction between RR types and
3366 meta-RR types is not officially standardized, subject to revision, and
3367 thus not suitable for encoding in a macro.
3369 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3370 and rhook members of the res_state type in <resolv.h> have been removed.
3371 The glibc stub resolver did not support these hooks, but the header file
3372 did not reflect that.
3374 * For multi-arch support it is recommended to use a GCC which has
3375 been built with support for GNU indirect functions. This ensures
3376 that correct debugging information is generated for functions
3377 selected by IFUNC resolvers. This support can either be enabled by
3378 configuring GCC with '--enable-gnu-indirect-function', or by
3379 enabling it by default by setting 'default_gnu_indirect_function'
3380 variable for a particular architecture in the GCC source file
3383 * GDB pretty printers have been added for mutex and condition variable
3384 structures in POSIX Threads. When installed and loaded in gdb these pretty
3385 printers show various pthread variables in human-readable form when read
3386 using the 'print' or 'display' commands in gdb.
3388 * Tunables feature added to allow tweaking of the runtime for an application
3389 program. This feature can be enabled with the '--enable-tunables' configure
3390 flag. The GNU C Library manual has details on usage and README.tunables has
3391 instructions on adding new tunables to the library.
3393 * A new version of condition variables functions have been implemented in
3394 the NPTL implementation of POSIX Threads to provide stronger ordering
3397 * A new version of pthread_rwlock functions have been implemented to use a more
3398 scalable algorithm primarily through not using a critical section anymore to
3401 Security related changes:
3403 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3404 have been created with makecontext could fail to terminate due to a
3405 missing .cantunwind annotation. This has been observed to lead to a hang
3406 (denial of service) in some Go applications compiled with gccgo. Reported
3407 by Andreas Schwab. (CVE-2016-6323)
3409 * The DNS stub resolver functions would crash due to a NULL pointer
3410 dereference when processing a query with a valid DNS question type which
3411 was used internally in the implementation. The stub resolver now uses a
3412 question type which is outside the range of valid question type values.
3415 The following bugs are resolved with this release:
3417 [4099] stdio: Overly aggressive caching by stream i/o functions.
3418 [7065] build: Support building glibc with -fstack-protector or -fstack-
3420 [9842] localedata: en_CA: incorrect date format
3421 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3422 before it started waiting
3423 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3424 [15765] nptl: sem_open is wrongly a cancellation point
3425 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3426 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3428 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3429 library linked with pthread
3430 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3431 "FIXME: Ingo" issue)
3432 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3433 [17252] libc: getrandom and getentropy syscall
3434 [17730] malloc: thread-local storage is sometimes improperly free()'d
3435 after being __libc_memalign()'d
3436 [18241] stdio: failed fseek on memstream does not set errno and can fail
3438 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3440 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3441 PTHREAD_PRIO_INHERIT mutex on ARM
3442 [18784] network: res_query and related function crash for special record
3443 type queries (CVE-2015-5180)
3444 [19380] math: strtod does not raise "inexact"
3445 [19387] string: Integer overflow in memchr
3446 [19390] string: Integer overflow in strncat
3447 [19398] build: linknamespace tests fail with massively parallel build
3448 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3450 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3451 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3452 [19514] libc: [PATCH] Fix spelling errors in spelling
3453 "implement"/"implementation" in several places
3454 [19582] network: Deprecate RES_USE_INET6
3455 [19673] manual: clog10 docs appear to be erroneous
3456 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3457 causes a segmentation fault
3458 [19826] libc: invalid pointer returned from __tls_get_addr with static
3460 [20016] network: resolv: Remove hooks support from the API
3461 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3463 [20033] math: [x86_64] vectorized math function don't call the __finite
3465 [20116] nptl: use after free in pthread_create
3466 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3467 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3469 [20311] nptl: please install proc_service.h
3470 [20366] libc: Compilation errors in installed headers in strict-compliance
3472 [20370] malloc: malloc: Arena free list management is still racy
3473 (incorrect fix in bug 19243)
3474 [20386] libc: assert (X = 0) does not result in GCC warning
3475 [20432] malloc: malloc: Minimize interface required for interposition
3476 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3477 in _Unwind_Backtrace (CVE-2016-6323)
3478 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3479 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3481 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3482 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3483 [20477] network: resolv: incorrect double-checked locking related to
3485 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3487 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3489 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3490 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3491 cause transition penalty
3492 [20517] math: sparcv9 missing fdiml compat symbol
3493 [20524] manual: strverscmp is inconsistent
3494 [20525] libc: <sys/quota.h> should be based on kernel headers
3495 [20539] math: GCC 7 -static -lm fails to link at -O3
3496 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3498 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3500 [20591] network: Remove obsolete DNSSEC support
3501 [20592] network: DNS resource record type classification macros in
3502 <arpa/nameser.h> are incorrect
3503 [20593] network: Update DNS RR type definitions
3504 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3505 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3507 [20629] network: libresolv: Remove support for bitstring labels
3509 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3510 assertion: "maxidx >= 2"
3511 [20660] math: [arm] Use VSQRT
3512 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3513 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3514 [20689] libc: Test for FMA should also check for AVX.
3515 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3516 [20715] math: iszero macro breaks existing code
3517 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3518 [20728] libc: powerpc: Missing TOC stub in clone
3519 [20729] build: glibc-2.24 fails to build for i486 with -Os
3520 [20750] build: Build fails with default PIE enabled gcc-6.x
3521 [20768] math: [alpha] sqrt fegetenv namespace
3522 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3524 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3525 __FLT_EVAL_METHOD__ is 2
3526 [20790] network: rpcgen buffer overrun in get_prog_declaration
3527 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3528 [20829] libc: crypt snprintf namespace
3529 [20847] libc: tst-vfork3 failure
3530 [20855] math: Default bits/mathdef.h has inappropriate float_t
3531 [20859] math: [sh4] FP_ILOGB0 invalid
3532 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3533 U+20AC), not same as GBK
3534 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3535 [20916] math: pow handling of sNaN arguments
3536 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3537 [20919] math: Bad pow (qNaN, 0) result with -lieee
3538 [20940] math: hypot sNaN handling
3539 [20947] math: fmax, fmin sNaN handling
3540 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3541 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3543 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3544 [20973] nptl: robust mutexes: Lost wake-ups
3545 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3546 [20978] nis: strlen on null pointer in nss_nisplus
3547 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3549 [21014] string: i686 memchr overflows internal pointer check
3550 [21019] libc: [mips] n32 lseek incorrect on overflow
3551 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3552 [21026] libc: [MIPS] readahead syscall is broken on n64
3553 [21028] math: Fallback fesetexceptflag should always succeed
3554 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3555 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3557 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3558 [21061] librt: [microblaze] librt lost clock_* exports
3559 [21073] libc: tunables: insecure environment variables passed to
3560 subprocesses with AT_SECURE
3561 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3565 * The minimum Linux kernel version that this version of the GNU C Library
3566 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3567 kernel version 2.6.32 or later suffices (on architectures that already
3568 required kernel versions more recent than 3.2, those requirements remain
3569 unchanged). Linux 3.2 or later kernel headers are required on all
3572 * The pap_AN locale has been deleted. This has been deprecated for a long
3573 time. It has been replaced by pap_AW & pap_CW, both of which have long
3574 been included in previous releases.
3576 * The readdir_r and readdir64_r functions have been deprecated. It is
3577 recommended to use readdir and readdir64 instead.
3579 * The type “union wait” has been removed. It was deprecated in the early
3580 1990s and never part of POSIX. Application code should use the int type
3581 instead of “union wait”.
3583 * A new NSS action is added to facilitate large distributed system
3584 administration. The action, MERGE, allows remote user stores like LDAP
3585 to be merged into local user stores like /etc/groups in order to provide
3586 easy to use, updated, and managed sets of merged credentials. The new
3587 action can be used by configuring it in /etc/nsswitch.conf:
3588 group: files [SUCCESS=merge] nis
3589 Implemented by Stephen Gallagher (Red Hat).
3591 * The deprecated __malloc_initialize_hook variable has been removed from the
3594 * The long unused localedef --old-style option has been removed. It hasn't
3595 done anything in over 16 years. Scripts using this option can safely
3598 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3599 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3600 return the next representable value in the direction of positive infinity
3601 and the nextdown functions return the next representable value in the
3602 direction of negative infinity. These are currently enabled as GNU
3605 Security related changes:
3607 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3608 could result in a stack overflow when getnetbyname was called with an
3609 overly long name. (CVE-2016-3075)
3611 * Previously, getaddrinfo copied large amounts of address data to the stack,
3612 even after the fix for CVE-2013-4458 has been applied, potentially
3613 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3614 instead. Reported by Michael Petlan. (CVE-2016-3706)
3616 * The glob function suffered from a stack-based buffer overflow when it was
3617 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3618 Reported by Alexander Cherepanov. (CVE-2016-1234)
3620 * The Sun RPC UDP client could exhaust all available stack space when
3621 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3622 alloca plugin for GCC. (CVE-2016-4429)
3624 * The IPv6 name server management code in libresolv could result in a memory
3625 leak for each thread which is created, performs a failing naming lookup,
3626 and exits. Over time, this could result in a denial of service due to
3627 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3629 The following bugs are resolved with this release:
3631 [1170] localedata: ne_NP: update Nepali locale definition file
3632 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3634 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3635 [6796] math: fdim() does not set errno on overflow
3636 [10354] libc: posix_spawn should use vfork() in more cases than presently
3637 [11213] localedata: localedata: add copyright disclaimer to locale files
3638 [12143] localedata: chr_US: new Cherokee locale
3639 [12450] localedata: sgs_LT: new locale
3640 [12676] localedata: ln_CD: new locale
3641 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3643 [13304] math: fma, fmaf, fmal produce wrong results
3644 [14259] build: --localedir arg to configure is ignored
3645 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3646 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3647 [14934] localedata: es_CL: wrong first weekday chilean locale
3648 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3650 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3652 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3653 [15368] nptl: raise() is not async-signal-safe
3654 [15479] math: ceil, floor, round and trunc raise inexact exception
3655 [15578] localedata: kk_KZ: various updates
3656 [16003] localedata: pap_AN: punt old locale
3657 [16137] localedata: iw_IL: punt old locale
3658 [16190] localedata: eo: new esperanto locale
3659 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3660 [16742] malloc: race condition: pthread_atfork() called before first
3661 malloc() results in unexpected locking behaviour/deadlocks
3662 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3664 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3665 [17565] localedata: pt_PT: wrong (work-)week start
3666 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3667 [17950] build: Build fails with -msse
3668 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3669 [18433] libc: posix_spawn does not return correctly upon failure to
3671 [18453] localedata: charmaps/IBM875: incorrect codes
3672 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3674 [18896] localedata: he_IL: improvements for currency
3675 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3676 Romanian locale data
3677 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3679 [19056] libc: Deprecate readdir_r
3680 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3682 [19198] localedata: nl_NL: small improvements for Dutch locales
3683 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3684 nameservers (CVE-2016-5417)
3685 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3687 [19400] locale: Language missing in "iso-639.def", trivial fix in
3689 [19431] malloc: Deadlock between fflush, getdelim, and fork
3690 [19505] libc: Incorrect file descriptor validity checks in
3691 posix_spawn_file_actions_add{open,close,dup2}
3692 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3693 when using RTLD_NEXT
3694 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3695 `intl/{gettextP,loadinfo}.h'
3696 [19534] libc: execle, execlp may use malloc
3697 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3698 [19573] network: res_nclose and __res_maybe_init disagree about name
3699 server initialization, breaking Hesiod
3700 [19575] localedata: Status of GB18030 tables
3701 [19581] localedata: sr_* date_fmt string contains additional newline
3702 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3704 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3705 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3706 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3707 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3709 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3711 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3713 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3714 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3715 [19633] locale: strfmon_l applies global locale to number formatting
3716 [19642] network: Memory leak in getnameinfo
3717 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3718 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3720 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3721 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3723 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3724 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3726 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3728 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3730 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3731 pointers and lengths in error-case.
3732 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3733 report errors on UTF-16 surrogates values.
3734 [19755] nscd: nscd assertion failure in gc
3735 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3736 [19759] libc: mempcpy shouldn't be inlined
3737 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3738 [19765] libc: s390 needs an optimized mempcpy
3739 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3740 NAME_MAX limit assumption (CVE-2016-1234)
3741 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3742 [19787] network: Missing and incorrect truncation checks in getnameinfo
3743 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3745 [19791] network: Assertion failure in res_query.c with un-connectable name
3747 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3748 [19822] math: libm.so install clobbers old version
3749 [19825] network: resolv: send_vc can return uninitialized data in second
3750 response to getaddrinfo
3751 [19830] network: nss_dns: should check RDATA length against buffer length
3752 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3753 confronted with A/AAAA records of invalid size
3754 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3755 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3756 [19853] stdio: Printing IBM long double in decimal with high precision is
3758 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3759 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3760 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3762 [19865] network: Assertion failure or memory leak in
3763 _nss_dns_getcanonname_r
3764 [19868] network: nss_dns: netent code does not skip over non-PTR records
3765 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3767 [19881] string: Improve x86-64 memset
3768 [19907] string: Incorrect memcpy tests
3769 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3771 [19925] libc: termios.h XCASE namespace
3772 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3773 [19929] libc: limits.h NL_NMAX namespace
3774 [19931] stdio: Memory leak in vfprintf
3775 [19957] libc: clone(CLONE_VM) access invalid parent memory
3776 [19963] localedata: en_IL: New locale
3777 [19989] stdio: stdio.h cuserid namespace
3778 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3780 [19996] locale: langinfo.h nl_langinfo_l namespace
3781 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3782 [20010] network: getaddrinfo: Stack overflow in hostent translation
3784 [20012] stdio: libio: fmemopen append mode failure
3785 [20014] stdio: stdio.h namespace for pre-threads POSIX
3786 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3787 [20023] libc: fcntl.h timespec namespace
3788 [20024] math: [x86_64] vectorized sincos trashes the stack
3789 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3790 [20041] time: sys/time.h timespec namespace
3791 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3792 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3793 [20051] libc: ttyslot in wrong header under wrong conditions
3794 [20054] libc: gethostname not declared for XPG4
3795 [20055] libc: termios.h missing tcgetsid for XPG4
3796 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3798 [20073] libc: sys/stat.h fchmod namespace
3799 [20074] libc: stdlib.h rand_r namespace
3800 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3801 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3803 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3804 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3806 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3807 [20119] libc: Wrong mask for processors level type from CPUID
3808 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3809 AS not supporting AVX512
3810 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3812 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3813 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3815 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3816 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3817 [20178] libc: posix_spawn{p} should not call exit
3818 [20191] stdio: libio: vtables hardening
3819 [20195] string: FMA4 detection requires CPUID execution with register
3821 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3822 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3824 [20212] math: acos (sNaN) returns sNaN
3825 [20213] math: asin (sNaN) returns sNaN
3826 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3827 [20218] math: [i386] asinhl (sNaN) returns sNaN
3828 [20219] math: [i386] atanhl (sNaN) returns sNaN
3829 [20222] stdio: fopencookie: Mangle function pointers
3830 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3831 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3832 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3834 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3835 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3836 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3837 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3838 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3839 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3840 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3841 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3842 [20240] math: modf (sNaN) returns sNaN
3843 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3844 [20250] math: frexp (sNaN) returns sNaN
3845 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3846 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3848 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3849 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3850 subscript is below array bounds [-Werror=array-bounds]
3851 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3852 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3854 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3855 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3857 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3858 "invalid" exceptions
3859 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3860 [20316] localedata: id_ID: Februari instead of Pebruari
3861 [20327] string: POWER8 strcasecmp returns incorrect result
3862 [20347] math: Failure: Test: j0_downward (0xap+0)
3863 [20348] libc: FAIL: misc/tst-preadvwritev64
3864 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3865 [20350] libc: There is no test for p{read,write}64
3866 [20357] math: Incorrect cos result for 1.5174239687223976
3867 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3871 * Unicode 8.0.0 Support: Character encoding, character type info, and
3872 transliteration tables are all updated to Unicode 8.0.0, using new
3873 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3874 These updates cause user visible changes, such as the fixes for bugs
3875 89, 16061, and 18568.
3877 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3878 kernel-internal CPU set size. This means that requests that change the
3879 CPU affinity which failed before (for example, an all-ones CPU mask) will
3880 now succeed. Applications that need to determine the effective CPU
3881 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3882 setting it because the kernel can adjust it (and the previous size check
3883 would not detect this in the majority of cases).
3885 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3886 the following new symbols are used: fts64_children, fts64_close,
3887 fts64_open, fts64_read and fts64_set.
3889 * getaddrinfo now detects certain invalid responses on an internal netlink
3890 socket. If such responses are received, an affected process will
3891 terminate with an error message of "Unexpected error <number> on netlink
3892 descriptor <number>" or "Unexpected netlink response of size <number> on
3893 descriptor <number>". The most likely cause for these errors is a
3894 multi-threaded application which erroneously closes and reuses the netlink
3895 file descriptor while it is used by getaddrinfo.
3897 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3898 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3899 unnecessary serialization of memory allocation requests across threads.
3900 The defect is now corrected. Users should see a substantial increase in
3901 the concurent throughput of allocation requests for applications which
3902 trigger this bug. Affected applications typically create and
3903 destroy threads frequently. (Bug 19048 was reported and analyzed by
3906 * There is now a --disable-timezone-tools configure option for disabling the
3907 building and installing of the timezone related utilities (zic, zdump, and
3908 tzselect). This is useful for people who build the timezone data and code
3909 independent of the GNU C Library.
3911 * The obsolete header <regexp.h> has been removed. Programs that require
3912 this header must be updated to use <regex.h> instead.
3914 * The obsolete functions bdflush, create_module, get_kernel_syms,
3915 query_module and uselib are no longer available to newly linked binaries;
3916 the header <sys/kdaemon.h> has been removed. These functions and header
3917 were specific to systems using the Linux kernel and could not usefully be
3918 used with the GNU C Library on systems with version 2.6 or later of the
3921 * Optimized string, wcsmbs and memory functions for IBM z13.
3922 Implemented by Stefan Liebler.
3924 * Newly linked programs that define a variable called signgam will no longer
3925 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3926 require signgam to be set by those functions must ensure that they use the
3927 variable provided by the GNU C Library and declared in <math.h>, without
3928 defining their own copy.
3930 * The minimum GCC version that can be used to build this version of the GNU
3931 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3932 still be used to compile programs using the GNU C Library.
3934 Security related changes:
3936 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3937 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3939 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3940 the pointer guard feature. It is always enabled. Previously,
3941 LD_POINTER_GUARD could be used to disable security hardening in binaries
3942 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3945 * An integer overflow in hcreate and hcreate_r could lead to an
3946 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3948 * The catopen function no longer has unbounded stack usage. Reported by
3949 Max. (CVE-2015-8779)
3951 * The nan, nanf and nanl functions no longer have unbounded stack usage
3952 depending on the length of the string passed as an argument to the
3953 functions. Reported by Joseph Myers. (CVE-2014-9761)
3955 * A stack-based buffer overflow was found in libresolv when invoked from
3956 libnss_dns, allowing specially crafted DNS responses to seize control
3957 of execution flow in the DNS client. The buffer overflow occurs in
3958 the functions send_dg (send datagram) and send_vc (send TCP) for the
3959 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3960 family. The use of AF_UNSPEC triggers the low-level resolver code to
3961 send out two parallel queries for A and AAAA. A mismanagement of the
3962 buffers used for those queries could result in the response of a query
3963 writing beyond the alloca allocated buffer created by
3964 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3965 the overflow. Thanks to the Google Security Team and Red Hat for
3966 reporting the security impact of this issue, and Robert Holiday of
3967 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3969 The following bugs are resolved with this release:
3971 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3972 [887] math: Math library function "logb" and "nextafter" inconsistent
3973 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3974 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3975 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3976 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3978 [4404] localedata: German translation of "Alarm clock" is misleading
3979 [6799] math: nextafter() and nexttoward() doen't set errno on
3980 overflow/underflow errors
3981 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3983 [10432] nis: _nss_nis_setnetgrent assertion failure
3984 [11460] libc: fts has no LFS support
3985 [12926] network: getaddrinfo()/make_request() may spin forever
3986 [13065] nptl: Race condition in pthread barriers
3987 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3988 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3990 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3991 [14912] libc: Rename non-installed bits/*.h headers
3992 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3993 [15367] math: Let gcc use __builtin_isinf
3994 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3995 [15421] math: lgamma wrongly sets signgam for ISO C
3996 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3997 FE_INVALID with argument out of range
3998 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4000 [15786] dynamic-link: ifunc resolver functions can smash function
4002 [15918] math: Unnecessary check for equality in hypotf()
4003 [16061] localedata: Review / update transliteration data
4004 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4006 [16141] time: strptime %z offset restriction
4007 [16171] math: drem should be alias of remainder
4008 [16296] math: fegetround is pure?
4009 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4010 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4012 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4013 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4015 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4016 "Exception "Inexact" set" on ppc32
4017 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4018 [16517] math: Missing underflow exception from tanf/tan/tanl
4019 [16519] math: Missing underflow exception from sinhf
4020 [16520] math: Missing underflow exception from tanhf
4021 [16521] math: Missing underflow exception from exp2
4022 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4024 [16734] stdio: fopen calls mmap to allocate its buffer
4025 [16961] math: nan function incorrect handling of bad sequences
4026 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4027 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4028 [16985] locale: localedef: confusing error message when opening output
4030 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4031 [17197] locale: Redundant shift character in iconv conversion output at
4033 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4034 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4035 [17250] dynamic-link: static linking breaks nss loading
4036 (getaddrinfo/getpwnam/etc...)
4037 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4039 [17441] math: isnan() should use __builtin_isnan() in GCC
4040 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4041 (related to lock elision)
4042 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4043 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4044 [17887] time: strptime should be able to parse "+01:00" style timezones
4045 [17905] libc: catopen() Multiple unbounded stack allocations
4047 [18084] libc: backtrace (..., 0) dumps core on x86
4048 [18086] libc: nice() sets errno to 0 on success
4049 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4050 is too large (CVE-2015-8778)
4051 [18251] dynamic-link: SONAME missing when audit modules provides path
4052 [18265] libc: add attributes for wchar string and memory functions
4053 [18370] math: csqrt missing underflows
4054 [18421] libc: [hppa] read-only segment has dynamic relocations
4055 [18472] libc: Obsolete syscall wrappers should be compat symbols
4056 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4057 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4058 [18525] localedata: Remove locale timezone information
4059 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4060 [18568] localedata: Update locale data to Unicode 8.0
4061 [18589] locale: sort-test.sh fails at random
4062 [18595] math: ctan, ctanh missing underflows
4063 [18604] libc: assert macro-expands its argument
4064 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4065 contains a vector instruction exception.
4066 [18611] math: j1, jn missing errno setting on underflow
4067 [18618] localedata: sync Chechen locale definitions with other *_RU
4069 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4070 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4071 [18665] network: In send_dg, the recvfrom function is NOT always using the
4072 buffer size of a newly created buffer (CVE-2015-7547)
4073 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4075 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4077 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4078 [18699] math: tilegx cproj() for various complex infinities does not yield
4080 [18724] libc: Harden put*ent functions against data injection
4081 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4082 [18755] build: build errors with -DNDEBUG
4083 [18757] stdio: fmemopen fails to set errno on failure
4084 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4086 [18781] libc: openat64 lacks O_LARGEFILE
4087 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4088 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4089 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4090 [18790] math: [ldbl-128ibm] tanhl inaccurate
4091 [18795] libc: stpncpy fortification misses buffer lengths that are
4092 statically too large
4093 [18796] build: build fails for --disable-mathvec
4094 [18803] math: hypot missing underflows
4095 [18820] stdio: fmemopen may leak memory on failure
4096 [18823] math: csqrt spurious underflows
4097 [18824] math: fma spurious underflows
4098 [18825] math: pow missing underflows
4099 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4100 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4101 [18870] build: sem_open.c fails to compile with missing symbol
4103 [18872] stdio: Fix memory leak in printf_positional
4104 [18873] libc: posix_fallocate overflow check ineffective
4105 [18875] math: Excess precision leads incorrect libm
4106 [18877] libc: arm: mmap offset regression
4107 [18887] libc: memory corruption when using getmntent on blank lines
4108 [18918] localedata: hu_HU: change time to HH:MM:SS format
4109 [18921] libc: Regression: extraneous stat() and fstat() performed by
4111 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4112 binaries (CVE-2015-8777)
4113 [18951] math: tgamma missing underflows
4114 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4116 [18953] localedata: lt_LT: change currency symbol to the euro
4117 [18956] math: powf inaccuracy
4118 [18961] math: [i386] exp missing underflows
4119 [18966] math: [i386] exp10 missing underflows
4120 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4121 [18969] build: multiple string test failures due to missing locale
4123 [18970] libc: Reference of pthread_setcancelstate in libc.a
4124 [18977] math: float / long double Bessel functions not in XSI POSIX
4125 [18980] math: i386 libm functions return with excess range and precision
4126 [18981] math: i386 scalb*, ldexp return with excess range and precision
4127 [18982] stdio: va_list and vprintf
4128 [18985] time: Passing out of range data to strftime() causes a segfault
4130 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4131 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4132 [19012] locale: iconv_open leaks memory on error path
4133 [19016] math: clog, clog10 inaccuracy
4134 [19018] nptl: Mangle function pointers in tls_dtor_list
4135 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4136 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4137 [19048] malloc: malloc: arena free list can become cyclic, increasing
4139 [19049] math: [powerpc] erfc incorrect zero sign
4140 [19050] math: [powerpc] log* incorrect zero sign
4141 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4142 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4143 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4144 [19074] network: Data race in _res_hconf_reorder_addrs
4145 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4146 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4147 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4149 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4151 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4152 [19086] manual: posix_fallocate64 documented argument order is wrong.
4153 [19088] math: lround, llround missing exceptions close to overflow
4155 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4156 [19095] math: dbl-64 lrint incorrect for 64-bit long
4157 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4158 [19124] dynamic-link: ld.so failed to build with older assmebler
4159 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4160 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4161 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4162 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4163 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4164 pthread_setaffinity_np
4165 [19156] math: [ldbl-128] j0l spurious underflows
4166 [19164] nptl: tst-getcpu fails with many possible CPUs
4167 [19168] math: math/test-ildoubl and math/test-ldouble failure
4168 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4169 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4171 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4172 (FE_NOMASK_ENV) do not clear SSE exceptions
4173 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4174 _int_new_arena/reused_arena
4175 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4176 [19201] math: dbl-64 remainder incorrect sign of zero result
4177 [19205] math: bits/math-finite.h conditions do not match math.h and
4179 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4180 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4181 for C99-based standards
4182 [19212] libc: features.h not -Wundef clean
4183 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4185 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4186 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4187 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4189 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4190 "inexact" exceptions
4191 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4193 [19242] libc: strtol incorrect in Turkish locales
4194 [19243] malloc: reused_arena can pick an arena on the free list, leading
4195 to an assertion failure and reference count corruption
4196 [19253] time: tzset() ineffective when temporary TZ did not include DST
4198 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4199 [19270] math: [hppa] Shared libm missing __isnanl
4200 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4201 MAP_HUGETLB and MAP_STACK defines
4202 [19313] nptl: Wrong __cpu_mask for x32
4203 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4204 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4205 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4206 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4207 [19363] time: x32: times() return value wrongly truncates/sign extends
4209 [19367] dynamic-link: Improve branch prediction on Silvermont
4210 [19369] network: Default domain name not reset by res_ninit when "search"
4211 / "domain" entry is removed from resolv.conf
4212 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4214 [19385] localedata: bg_BG: time separator should be colon, not comma
4215 [19408] libc: linux personality syscall wrapper may erroneously return an
4216 error on 32-bit architectures
4217 [19415] libc: dladdr returns wrong names on hppa
4218 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4219 IBM905, IBM907, and IBM909
4220 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4221 [19443] build: build failures with -DDEBUG
4222 [19451] build: Make check fails on test-double-vlen2
4223 [19462] libc: Glibc failed to build with -Os
4224 [19465] math: Wrong code with -Os
4225 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4227 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4229 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4230 [19486] math: S390: Math tests fail with "Exception Inexact set".
4231 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4232 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4234 [19590] math: Fail to build shared objects that use libmvec.so functions.
4238 * The following bugs are resolved with this release:
4240 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4241 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4242 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4243 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4244 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4245 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4246 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4247 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4248 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4249 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4250 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4251 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4252 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4253 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4254 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4255 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4256 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4257 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4258 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4259 18657, 18676, 18694, 18696, 18887.
4261 * Cache information can be queried via sysconf() function on s390 e.g. with
4262 _SC_LEVEL1_ICACHE_SIZE as argument.
4264 * A buffer overflow in gethostbyname_r and related functions performing DNS
4265 requests has been fixed. If the NSS functions were called with a
4266 misaligned buffer, the buffer length change due to pointer alignment was
4267 not taken into account. This could result in application crashes or,
4268 potentially arbitrary code execution, using crafted, but syntactically
4269 valid DNS responses. (CVE-2015-1781)
4271 * The time zone file parser has been made more robust against crafted time
4272 zone files, avoiding heap buffer overflows related to the processing of
4273 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4274 large time zone data files. Overly long time zone specifiers in the TZ
4275 variable no longer result in stack overflows and crashes.
4277 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4278 for LD and GD on x86 and x86-64, has been implemented. You will need
4279 binutils-2.24 or later to enable this optimization.
4281 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4282 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4283 Hat). These updates cause user visible changes, such as the fix for bug
4286 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4287 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4288 condition in some applications.
4290 * Added vector math library named libmvec with the following vectorized x86_64
4291 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4293 The library can be disabled with --disable-mathvec. Use of the functions is
4294 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4295 Shared library libmvec.so is linked in as needed when using -lm (no need to
4296 specify -lmvec explicitly for not static builds).
4297 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4299 * A new fmemopen implementation has been added with the goal of POSIX
4300 compliance. The new implementation fixes the following long-standing
4301 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4302 old implementation is still present for use be by existing binaries.
4304 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4305 releases. It has been fixed to match 2.19 and older, but binaries built
4306 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4308 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4309 Contributed by Roland McGrath (Google).
4311 * The header <regexp.h> is deprecated, and will be removed in a future
4312 release. Use of this header will trigger a deprecation warning.
4313 Application developers should update their code to use <regex.h> instead.
4315 This header was formerly part of SUS, but was deprecated in 1994 and
4316 removed from the standard in 2001. Also, the glibc implementation
4317 leaks memory. See BZ#18681 for more details.
4321 * The following bugs are resolved with this release:
4323 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4324 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4325 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4326 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4327 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4328 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4329 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4330 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4331 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4332 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4335 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4336 too little memory for the to-be-scanned arguments and overflow the
4337 allocated buffer. The implementation now correctly computes the required
4338 buffer size when using malloc, and switches to malloc from alloca as
4341 * A new semaphore algorithm has been implemented in generic C code for all
4342 machines. Previous custom assembly implementations of semaphore were
4343 difficult to reason about or ensure that they were safe. The new version
4344 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4345 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4346 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4348 * Port to Altera Nios II has been contributed by Mentor Graphics.
4350 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4351 implementations for powerpc64/powerpc64le.
4352 Implemented by Adhemerval Zanella (IBM).
4354 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4355 and powerpc64le. This may improve lock scaling of existing programs on
4356 HTM capable systems. The lock elision code is only enabled with
4357 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4358 powerpc will issue a transaction abort on every syscall to avoid side
4359 effects being visible outside transactions.
4361 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4362 AArch64. Contributed by ARM Ltd.
4364 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4366 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4367 under certain input conditions resulting in the execution of a shell for
4368 command substitution when the application did not request it. The
4369 implementation now checks WRDE_NOCMD immediately before executing the
4370 shell and returns the error WRDE_CMDSUB as expected.
4372 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4373 processing format strings with a large number of format specifiers.
4375 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4376 infinite loop if the DNS response contained a PTR record of an unexpected
4379 * The minimum GCC version that can be used to build this version of the GNU
4380 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4381 still be used to compile programs using the GNU C Library.
4383 * The GNU C Library is now built with -Werror by default. This can be
4384 disabled by configuring with --disable-werror.
4386 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4388 * The obsolete sigvec function has been removed. This was the original
4389 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4390 programs have been using instead for about 25 years. Of course, ABI
4391 compatibility for old binaries using sigvec remains intact.
4393 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4394 with newer versions of bison.
4396 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4397 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4398 registers overlay two consecutive single-precision registers. MIPS32R2
4399 introduced a new FPU mode (FR=1) where double-precision registers extend the
4400 corresponding single-precision registers which is incompatible with the
4401 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4402 require the use of FR=1 making a transition necessary. New o32 ABI
4403 extensions enable users to migrate over time from the original o32 ABI
4404 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4405 tracks the ABI of any loaded object and verifies that new objects are
4406 compatible. Mode transitions will also be requested as required and
4407 unsupportable objects will be rejected. The ABI checks include both soft and
4408 hard float ABIs for o32, n32 and n64.
4410 GCC 5 with GNU binutils 2.25 onwards:
4411 It is strongly recommended that all o32 system libraries are built using the
4412 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4413 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4414 compiler using --with-fp-32=xx to set this by default.
4418 * The following bugs are resolved with this release:
4420 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4421 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4422 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4423 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4424 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4425 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4426 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4427 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4428 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4429 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4430 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4431 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4432 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4433 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4434 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4436 * Reverted change of ABI data structures for s390 and s390x:
4437 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4438 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4439 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4440 are preserved pointing straight to the same implementation as the old ones.
4441 Given that, new callers will simply provide a too-big buffer to these
4442 functions. Any applications/libraries out there that embed jmp_buf or
4443 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4444 against 2.19 headers will have to rebuilt again. This is necessary in any
4445 case to revert the breakage in their ABI caused by the glibc change.
4447 * Support for file description locks is added to systems running the
4448 Linux kernel. The standard file locking interfaces are extended to
4449 operate on file descriptions, not file descriptors, via the use of
4450 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4451 are associated with an open file instead of a process.
4453 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4455 * The minimum Linux kernel version that this version of the GNU C Library
4456 can be used with is 2.6.32.
4458 * Running the testsuite no longer terminates as soon as a test fails.
4459 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4460 with PASS or FAIL lines for individual tests. A summary of the results is
4461 printed, including a list of failing lists, and "make check" exits with
4462 error status if there were any unexpected failures. "make check
4463 stop-on-test-failure=y" may be used to keep the old behavior.
4465 * The am33 port, which had not worked for several years, has been removed
4468 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4469 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4470 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4471 conflicted with POSIX (support for which was removed in 2.19), the
4472 interfaces those macros enabled remain available when compiling with
4473 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4474 test macros defined.
4476 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4478 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4479 This may improve lock scaling of existing programs on TX capable systems.
4480 The lock elision code is only built with --enable-lock-elision=yes and
4481 then requires a GCC version supporting the TX builtins. With lock elision
4482 default mutexes are elided via __builtin_tbegin, if the cpu supports
4483 transactions. By default lock elision is not enabled and the elision code
4486 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4487 copy the path argument. This allowed programs to cause posix_spawn to
4488 deference a dangling pointer, or use an unexpected pathname argument if
4489 the string was modified after the posix_spawn_file_actions_addopen
4492 * All supported architectures now use the main glibc sysdeps directory
4493 instead of some being in a separate "ports" directory (which was
4494 distributed separately before glibc 2.17).
4496 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4497 On configurations that support it (all Linux configurations), it's now
4498 used regardless of the --enable-add-ons switch to configure. It is no
4499 longer possible to build such configurations without pthreads support.
4501 * Locale names, including those obtained from environment variables (LANG
4502 and the LC_* variables), are more tightly checked for proper syntax.
4503 setlocale will now fail (with EINVAL) for locale names that are overly
4504 long, contain slashes without starting with a slash, or contain ".." path
4505 components. (CVE-2014-0475) Previously, some valid locale names were
4506 silently replaced with the "C" locale when running in AT_SECURE mode
4507 (e.g., in a SUID program). This is no longer necessary because of the
4510 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4511 with application code using Intel MPX instructions. (With all previous
4512 versions, the MPX register state could be clobbered when making calls
4513 into or out of a shared library.) Note that while the new dynamic
4514 linker is compatible with all known x86 hardware whether or not it
4515 supports Intel MPX, some x86 instruction-set emulators might fail to
4516 handle the new instruction encodings. This is known to affect Valgrind
4517 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4518 release), and might affect other tools that do instruction emulation.
4520 * Support for loadable gconv transliteration modules has been removed.
4521 The support for transliteration modules has been non-functional for
4522 over a decade, and the removal is prompted by security defects. The
4523 normal gconv conversion modules are still supported. Transliteration
4524 with //TRANSLIT is still possible, and the //IGNORE specifier
4525 continues to be supported. (CVE-2014-5119)
4527 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4528 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4529 resulting a denial-of-service security vulnerability in applications which
4530 use functions related to iconv. (CVE-2014-6040)
4534 * The following bugs are resolved with this release:
4536 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4537 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4538 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4539 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4540 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4541 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4542 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4543 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4544 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4545 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4546 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4547 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4548 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4549 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4550 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4551 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4552 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4553 16431, 16453, 16474, 16506, 16510, 16529
4555 * Slovenian translations for glibc messages have been contributed by the
4556 Translation Project's Slovenian team of translators.
4558 * The public headers no longer use __unused nor __block. This change is to
4559 support compiling programs that are derived from BSD sources and use
4560 __unused internally, and to support compiling with Clang's -fblock
4561 extension which uses __block.
4563 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4564 large collation sequences to optimize multiple passes. This cache
4565 computation may overflow for large collation sequences and may cause a
4566 stack or buffer overflow. This is now fixed to use a slower algorithm
4567 which does not use a cache if there is an integer overflow.
4569 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4570 rules for large collation sequences to optimize multiple passes and falls
4571 back to alloca if malloc fails, resulting in a possible stack overflow.
4572 The implementation now falls back to an uncached collation sequence lookup
4575 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4576 initialized for static applications resulting in the security feature
4577 being disabled. The pointer guard is now correctly initialized to a
4578 random value for static applications. Existing static applications need
4579 to be recompiled to take advantage of the fix (bug 15754).
4581 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4582 to the d_name member of struct dirent, or omit the terminating NUL
4583 character. (Bugzilla #14699).
4585 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4586 aligned_alloc functions could allocate too few bytes or corrupt the
4587 heap when passed very large allocation size values (Bugzilla #15855,
4590 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4591 for AF_INET6 has been fixed (Bugzilla #16072).
4593 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4594 pap_CW, quz_PE, the_NP.
4596 * Substantially revised locales: gd_GB, ht_HT
4598 * The LC_ADDRESS field was updated to support country_car for almost all
4601 * ISO 1427 definitions were updated.
4603 * ISO 3166 definitions were updated.
4605 * The localedef utility now supports --big-endian and --little-endian
4606 command-line options to generate locales for a different system from that
4607 for which the C library was built.
4609 * Binary locale files now only depend on the endianness of the system for
4610 which they are generated and not on other properties of that system. As a
4611 consequence, binary files generated with new localedef may be incompatible
4612 with old versions of the GNU C Library, and binary files generated with
4613 old localedef may be incompatible with this version of the GNU C Library,
4614 in the following circumstances:
4616 + Locale files may be incompatible on m68k systems.
4618 + Locale archive files (but not separate files for individual locales) may
4619 be incompatible on systems where plain "char" is signed.
4621 * The configure option --disable-versioning has been removed. Builds with
4622 --disable-versioning had not worked for several years.
4624 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4625 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4627 * SystemTap probes for malloc have been introduced.
4629 * SystemTap probes for slow multiple precision fallback paths of
4630 transcendental functions have been introduced.
4632 * Support for powerpc64le has been added.
4634 * The soft-float powerpc port now supports e500 processors.
4636 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4638 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4639 set of header declarations that are enabled by default, even when other
4640 feature test macros or compiler options such as -std=c99 would otherwise
4641 disable some of those declarations.
4643 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4644 conflict with POSIX. The libbsd-compat library (which was a dummy library
4645 that did nothing) has also been removed.
4647 * Preliminary documentation about Multi-Thread, Async-Signal and
4648 Async-Cancel Safety has been added.
4650 * Change of ABI data structures for s390 and s390x:
4651 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4652 allow for future hardware extensions. All library functions that accept or
4653 return these structures were versioned in order to provide backwards
4654 compatibility with existing code. However, not all cases can be handled
4655 with interface versioning. If an application embeds either structure into
4656 another structure and that structure is passed to another compilation unit
4657 which expects the newer larger-sized object then any access to the new
4658 fields will result in undefined behaviour. Similarly any access to fields
4659 that were moved by the enlarging of the structures will cause undefined
4660 behaviour. To fix the undefined behaviour all objects that are part of the
4661 final in-memory image must agree on the size of structures, and this may
4662 require recompilation.
4666 * The following bugs are resolved with this release:
4668 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4669 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4670 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4671 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4672 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4673 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4674 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4675 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4676 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4677 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4678 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4679 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4680 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4683 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4684 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4685 Distributions can re-enable building and using pt_chown via the new configure
4686 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4687 considerable security risks and should only be used if the distribution
4688 understands and accepts the risks.
4690 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4693 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4694 fixed (Bugzilla #15330).
4696 * Add support for calling C++11 thread_local object destructors on thread
4697 and program exit. This needs compiler support for offloading C++11
4698 destructor calls to glibc.
4700 * Improved worst case performance of libm functions with double inputs and
4703 * Support for priority inherited mutexes in pthread condition variables on
4704 non-x86 architectures.
4706 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4708 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4710 * Optimized string functions for ARM. Implemented by Will Newton and
4713 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4715 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4718 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4719 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4721 * Added a benchmark framework to track performance of functions in glibc.
4723 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4724 It is based on draft TS 18661 and currently enabled as a GNU extension.
4726 * On Linux, the clock function now uses the clock_gettime system call
4727 for improved precision, rather than old times system call.
4729 * Added support for version-3 tz format files. This is needed when using
4730 the tz database release 2013e or later, and affects a few unusual cases --
4731 currently only TZ='America/Godthab' for time stamps after 2037.
4733 * Added new API functions pthread_getattr_default_np and
4734 pthread_setattr_default_np to get and set the default pthread
4735 attributes of a process.
4737 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4738 This may improve lock scaling of existing programs on TSX capable systems.
4739 When the --enable-lock-elision=yes parameter is specified at configure
4740 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4743 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4744 availability). Implemented by Ryan S. Arnold.
4746 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4750 * The following bugs are resolved with this release:
4752 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4753 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4754 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4755 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4756 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4757 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4758 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4759 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4760 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4761 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4762 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4763 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4764 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4765 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4766 14879, 14889, 14893, 14898, 14914.
4768 * Optimization of memcpy for MIPS.
4770 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4771 EMFILE has been fixed (Bugzilla #14889).
4773 * The add-on ports collection is now distributed in the "ports" subdirectory
4774 of the main GNU C Library distribution, rather than separately.
4776 * Port to ARM AArch64 contributed by Linaro.
4778 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4779 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4781 Implemented by Andreas Krebbel.
4783 * The new function secure_getenv allows secure access to the environment,
4784 returning NULL if running in a SUID/SGID process. This function replaces
4785 the internal function __secure_getenv.
4787 * SystemTap static probes have been added into the dynamic linker.
4788 Implemented by Gary Benson.
4790 * Optimizations of string functions strstr, strcasestr and memmem.
4791 Implemented by Maxim Kuvyrkov.
4793 * The minimum Linux kernel version that this version of the GNU C Library
4794 can be used with is 2.6.16.
4796 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4797 powerpc POWER7. Implemented by Will Schmidt.
4799 * New configure option --disable-nscd builds the C library such that it
4800 never attempts to contact the Name Service Caching Daemon (nscd).
4801 New configure option --disable-build-nscd avoids building nscd itself;
4802 this is the default if --disable-nscd is used.
4804 * Improved support for cross-compilation, including cross-testing and
4805 bootstrap builds without a previously built glibc.
4807 * Several testsuite tests are now able to test multiple IFUNC variants of an
4808 interface, rather than just testing the one that would be chooen by
4811 * New configure options --with-bugurl and --with-pkgversion, for
4812 distributors to use to embed their bug-reporting and package version
4813 information in --help and --version output.
4815 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4816 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4817 allows creation of chroots without the procfs mounted on /proc.
4819 * The `crypt' function now fails if passed salt bytes that violate the
4820 specification for those values. On Linux, the `crypt' function will
4821 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4822 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4823 when the mode is enabled.
4825 * The `clock_*' suite of functions (declared in <time.h>) is now available
4826 directly in the main C library. Previously it was necessary to link with
4827 -lrt to use these functions. This change has the effect that a
4828 single-threaded program that uses a function such as `clock_gettime' (and
4829 is not linked with -lrt) will no longer implicitly load the pthreads
4830 library at runtime and so will not suffer the overheads associated with
4831 multi-thread support in other code such as the C++ runtime library.
4833 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4838 * The following bugs are resolved with this release:
4840 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4841 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4842 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4843 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4844 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4845 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4846 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4847 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4848 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4849 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4850 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4851 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4852 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4853 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4854 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4855 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4856 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4857 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4858 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4859 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4860 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4861 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4864 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4865 configuring glibc with:
4866 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4867 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4868 Implemented by H.J. Lu.
4872 + define static_assert
4874 + do not declare gets
4876 + declare at_quick_exit and quick_exit also for ISO C11
4878 + aligned_alloc. NB: The code is deliberately allows the size parameter
4879 to not be a multiple of the alignment. This is a moronic requirement
4880 in the standard but it is only a requirement on the caller, not the
4883 + timespec_get added
4885 + uchar.h support added
4887 + CMPLX, CMPLXF, CMPLXL added
4889 Implemented by Ulrich Drepper.
4891 * Support for the IA-64 has been moved to ports.
4893 * Remove support for anything but ELF binary format
4895 * Checking versions of poll, ppoll added.
4896 Implemented by Ulrich Drepper.
4898 * More generic and 64-bit performance optimizations to math functions.
4899 Implemented by Ulrich Drepper.
4901 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4902 headers and functions available at compile time as they were before
4903 version 2.14. This option will be removed at some time in the future
4904 after the TI-RPC library becomes fully sufficient for the needs of
4905 existing applications.
4907 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4908 Note that glibc is not expected to work with any Linux kernel version
4911 * New header <sys/auxv.h> and function getauxval allowing easy access to
4912 the AT_* key-value pairs passed from the Linux kernel. The header also
4913 defines the HWCAP_* bits associated with the AT_HWCAP key.
4915 * New locales: mag_IN
4917 * New configure option --enable-systemtap builds SystemTap static probes
4918 into libc for setjmp and longjmp and into libpthread for various operations.
4919 So far the setjmp/longjmp probes and some of the libpthread probes are
4920 provided only for i*86 and x86_64.
4921 Implemented by Roland McGrath and Rayson Ho.
4923 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4925 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4928 * More optimized functions for SPARC. Implemented by David S. Miller.
4930 * Improved support for cross-compilation, especially bootstrap builds
4931 without a previously built glibc.
4933 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4934 Chris Metcalf from Tilera.
4936 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4937 now supported for ARM processors.
4939 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4940 as the name of the dynamic linker, to distinguish it from the
4941 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4943 * Support for CRIS has been removed from ports.
4945 * A new class of installed header has been documented for low-level
4946 platform-specific functionality. PowerPC added the first instance with a
4947 function to provide time base register access. Contributed by Tulio
4948 Magno Quites Machado Filho.
4950 * ix86 configurations now install header files that are consistent with
4951 what x86-64 configurations install. These same header files can be used
4952 for -m32, -m64, or -mx32 builds.
4953 Contributed by H.J. Lu.
4955 * Math library bug fixes. A thorough audit of all open math library bugs was
4956 conducted by Joseph Myers. Significant progress was made on many math
4957 library bugs resulting in more accurate exceptions and function results.
4958 Many thanks to all those that contributed including Andreas Jaeger for his
4959 patch review and work on the x87 trigonometric instruction issues.
4961 * Timezone data is no longer installed. Timezone-related binaries and scripts
4962 will continue to be installed. Users should obtain their timezone data from
4963 their distribution provider or from the tzdata package at
4964 <ftp://munnari.oz.au/pub/>.
4968 * The following bugs are resolved with this release:
4970 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4971 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4972 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4973 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4974 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4975 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4976 13484, 13506, 13515, 13523, 13524, 13538, 13540
4978 * New program pldd to list loaded object of a process
4979 Implemented by Ulrich Drepper.
4981 * Add nss_db support back to glibc. No more dependency on Berkeley db
4982 and support for initgroups lookups.
4983 Implemented by Ulrich Drepper.
4985 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4986 Contributed by HJ Lu.
4988 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4989 Contributed by HJ Lu.
4991 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4992 on x86-32 and x86-64.
4993 Contributed by Liubov Dmitrieva.
4995 * Optimized strchr and strrchr for SSE on x86-32.
4996 Contributed by Liubov Dmitrieva.
4998 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4999 for x86-64 and x86-32.
5000 Contributed by Liubov Dmitrieva.
5002 * New interfaces: scandirat, scandirat64
5003 Implemented by Ulrich Drepper.
5005 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5006 Implemented by Ulrich Drepper.
5008 * nscd now also caches the netgroup database.
5009 Implemented by Ulrich Drepper.
5011 * Integrate libm with gcc's -ffinite-math-only option.
5012 Implemented by Ulrich Drepper.
5014 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5015 to math functions. Implemented by Ulrich Drepper.
5017 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5018 Implemented by Ulrich Drepper.
5020 * New Linux interfaces: process_vm_readv, process_vm_writev
5022 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5023 Implemented by Ulrich Drepper.
5025 * Optimized nearbyint and strcasecmp for PPC.
5026 Implemented by Adhemerval Zanella.
5028 * New locales: bho_IN, unm_US, es_CU, ta_LK
5032 * The following bugs are resolved with this release:
5034 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5035 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5036 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5037 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5038 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5039 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5040 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5041 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5042 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5043 12795, 12811, 12813, 12814, 12841
5045 * The RPC implementation in libc is obsoleted. Old programs keep working
5046 but new programs cannot be linked with the routines in libc anymore.
5047 Programs in need of RPC functionality must be linked against TI-RPC.
5048 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5050 Visible changes of this change include (obviously) the inability to link
5051 programs using RPC functions without referencing the TI-RPC library and the
5052 removal of the RPC headers from the glibc headers.
5053 Implemented by Ulrich Drepper.
5055 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5056 syncfs, setns, sendmmsg
5058 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5059 yue_HK, lij_IT, mhr_RU
5061 * New encodings: CP770, CP771, CP772, CP773, CP774
5063 * New program sotruss to trace calls through PLTs
5064 Implemented by Ulrich Drepper.
5066 * The malloc hook implementation is marked deprecated and will be removed
5067 from the default implementation in the next version. The design never
5068 worked ever since the introduction of threads. Even programs which do
5069 not create threads themselves can use multiple threads created internally.
5073 * The following bugs are resolved with this release:
5075 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5076 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5077 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5078 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5081 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5083 * POWER7 optimizations: memset, memcmp, strncmp
5085 * New optimized string functions for x86-64: strnlen (SSE2),
5086 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5087 Implemented by Ulrich Drepper.
5091 * The following bugs are resolved with this release:
5093 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5094 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5095 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5096 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5097 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5098 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5099 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5100 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5102 * New interfaces: pthread_getname_np, pthread_setname_np
5104 * New Linux interface: recvmmsg
5106 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5108 * The dynamic linker now recognizes supported ABI versions from the
5109 EI_ABIVERSION field in the ELF header.
5110 Implemented by Ulrich Drepper.
5112 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5113 will not be used to fill in password fields in the passwd.byname replies.
5114 Instead it is used to synthesize the shadow.byname table, should it be
5115 missing. This is a useful mode in some installations involving Solaris.
5116 Implemented by Ulrich Drepper.
5118 * New locales: kok_IN, sq_MK, cv_RU
5122 * The following bugs are resolved with this release:
5124 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5125 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5126 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5127 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5128 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5129 10789, 10817, 10823, 10840, 10847
5131 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5133 Implemented by Ulrich Drepper.
5135 * Checking version of longjmp added that fails if an uninitialized stack
5136 frame would be created. Implemented by Ulrich Drepper.
5138 * STT_GNU_IFUNC is now supported in static executables.
5139 Implemented by H.J. Lu.
5141 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5143 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5144 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5145 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5146 Contributed by H.J. Lu.
5148 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5149 Implemented by Ulrich Drepper.
5151 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5153 Contributed by H.J. Lu.
5155 * Support for fma instruction in AVX on x86-64.
5156 Implemented by H.J. Lu and Ulrich Drepper.
5158 * AVX support in x86-64 auditing support in ld.so.
5159 Implemented by H.J. Lu.
5161 * STB_GNU_UNIQUE support added.
5162 Implemented by Ulrich Drepper.
5164 * Implement second fallback mode for optimized DNS lookup for even more
5165 broken environments. If two requests from the same port are not
5166 handled correctly close the socket and open a new one before sending
5167 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5168 can be used to select this mode right away, instead of rediscovering the
5169 necessity is every process again.
5170 Implemented by Ulrich Drepper.
5172 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5173 Implemented by Adam Tkac.
5175 * Optimized iconv conversions for S390x.
5176 Implemented by Andreas Krebbel.
5178 * Using condvars with PI mutexes is now more efficient due to kernel
5179 support for requeueing to PI futexes. NPTL support added for x86-64.
5180 Implemented by Ulrich Drepper.
5182 * New locales: ps_AF, my_MM
5186 * The following bugs are resolved with this release:
5188 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5189 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5190 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5191 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5192 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5194 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5195 Implemented by Ulrich Drepper.
5197 * New Linux interfaces: accept4, fallocate, fallocate64.
5198 Implemented by Ulrich Drepper.
5200 * Correct declarations of string function when used in C++ code. This
5201 could lead to compile errors for invalid C++ code.
5203 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5206 * New POSIX 2008 interface: psiginfo
5207 Implemented by Ulrich Drepper.
5209 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5210 Implemented by Ulrich Drepper.
5212 * Support for selecting between multiple function definitions at runtime
5213 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5215 * The libcrypt library can now use the hash function implementations in
5216 NSS. Implemented by Ulrich Drepper.
5218 * The malloc implementation can be compiled to be less memory efficient
5219 but higher performing in multi-threaded programs.
5220 Implemented by Ulrich Drepper.
5222 * New locales: nan_TW@latin, ks_IN
5224 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5225 Implemented by Ulrich Drepper.
5227 * Extended printf hook support. It is possible to use user-defined types
5228 and extend existing format specifiers.
5229 Implemented by Ulrich Drepper.
5231 * Handling for group shadow files has been added.
5232 Implemented by Ulrich Drepper.
5234 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5235 servers (the case, e.g., for some people using the built-in DNS
5236 server in ADSL modems/routers). There is a once-per-process timeout
5237 in case of a broken server. To avoid it, users can run nscd or put
5238 'options single-request' in /etc/resolv.conf.
5239 Implemented by Ulrich Drepper.
5243 * The following bugs are resolved with this release:
5245 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5246 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5247 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5248 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5249 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5251 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5252 up at the same time. Implemented by Ulrich Drepper.
5254 * TLS descriptors for LD and GD on x86 and x86-64.
5255 Implemented by Alexandre Oliva.
5257 * getaddrinfo now handles DCCP and UDPlite.
5258 Implemented by Ulrich Drepper.
5260 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5261 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5262 Implemented by Ulrich Drepper.
5264 * New implementation of memmem, strstr, and strcasestr which is O(n).
5265 Implemented by Eric Blake.
5267 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5269 * Implement "e" option for popen to open file descriptor with the
5270 close-on-exec flag set. Implemented by Ulrich Drepper.
5272 * Implement "b" mode for fmemopen. In this mode writes writes don't
5273 implicitly add a NUL byte and seeks from the end of the buffer really
5274 use the buffer end, not the string length as the basis.
5275 Implemented by Ulrich Drepper.
5277 * Many functions, exported and internal, now atomically set the close-on-exec
5278 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5280 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5282 Implemented by Pravin Satpute.
5284 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5288 * The following bugs are resolved with this release:
5290 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5291 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5292 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5293 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5294 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5295 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5296 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5298 * New locales: bo_CN, bo_IN, shs_CA.
5300 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5302 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5303 Implemented by Pravin Satpute.
5305 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5307 * nscd caches now all timeouts for DNS entries
5308 Implemented by Ulrich Drepper.
5310 * nscd is more efficient and wakes up less often.
5311 Implemented by Ulrich Drepper.
5313 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5314 vdprintf, and obstack_vprintf.
5315 Implemented by Jakub Jelinek.
5317 * Faster memset for x86-64.
5318 Implemented by Harsha Jagasia and H.J. Lu.
5320 * Faster memcpy on x86.
5321 Implemented by Ulrich Drepper.
5323 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5324 Implemented by Ulrich Drepper.
5326 * Faster sqrt and sqrtf implemention for some PPC variants.
5327 Implemented by Steven Munroe.
5331 * The following bugs are resolved with this release:
5333 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5334 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5335 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5336 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5337 5071, 5103, 5104, 5112, 5113, 5184, 5186
5339 * More checking functions: fread, fread_unlocked, open*, mq_open.
5340 Implemented by Jakub Jelinek and Ulrich Drepper.
5342 * Extend fortification to C++. Implemented by Jakub Jelinek.
5344 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5345 by not recognizing 'a' as a modifier when those specs are requested.
5346 Implemented by Jakub Jelinek.
5348 * PPC optimizations to math and string functions.
5349 Implemented by Steven Munroe.
5351 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5352 options to be passed. Implemented by Ulrich Drepper.
5354 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5356 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5357 Implemented by Ulrich Drepper.
5359 * Handle private futexes in the NPTL implementation.
5360 Implemented by Jakub Jelinek and Ulrich Drepper.
5362 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5363 Implemented by Roland McGrath and Ulrich Drepper.
5365 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5367 * SHA-256 and SHA-512 based password encryption.
5368 Implemented by Ulrich Drepper.
5370 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5371 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5374 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5375 Implemented by Ulrich Drepper.
5379 * The following bugs are resolved with this release:
5381 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5382 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5383 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5384 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5385 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5386 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5387 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5390 * New Linux interfaces: epoll_pwait, sched_getcpu.
5392 * New generic interfaces: strerror_l.
5394 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5398 * The following bugs are resolved with this release:
5400 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5401 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5402 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5403 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5404 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5405 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5406 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5407 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5408 3225, 3251, 3252, 3253, 3273
5410 * For Linux, the sorting of addresses returned by getaddrinfo now also
5411 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5412 Implemented by Ulrich Drepper.
5414 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5415 Implemented by Ulrich Drepper.
5417 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5419 * New iconv module for MIK. Contributed by Alexander Shopov.
5421 * For sites with broken group and/or passwd database, the auto-propagate
5422 option of nscd can prevent creating ID lookup entries from the results
5423 of a name lookup and vice versa. This usually is no problem but some
5424 site might have problems with the default behavior.
5425 Implemented by Ulrich Drepper.
5427 * Iterating over entire database in NIS can be slow. With the
5428 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5429 to trade time for memory. The entire database will be read at once.
5430 Implemented by Ulrich Drepper.
5432 * The interfaces introduced in RFC 3542 have been implemented by
5435 * Support for the new ELF hash table format was added by Ulrich Drepper.
5437 * Support for priority inheritance mutexes added by Jakub Jelinek and
5440 * Support for priority protected mutexes added by Jakub Jelinek.
5442 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5443 or_IN, csb_PL, fy_NL, sr_ME.
5447 * More overflow detection functions.
5449 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5450 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5452 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5453 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5454 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5455 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5456 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5457 by Masahide Washizawa.
5459 * It is now possible to install audit libraries for the dynamic linker using
5460 LD_AUDIT. Implemented by Ulrich Drepper.
5462 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5463 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5464 For a libc and libpthread that works well on Linux 2.4 kernels, we
5465 recommend using the stable 2.3 branch.
5467 * The new function open_wmemstream acts like open_memstream,
5468 but uses a wchar_t wide character buffer.
5470 * The new function ppoll is an improved version of poll, similar to pselect.
5472 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5473 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5474 renameat, unlinkat, linkat, symlinkat, readlinkat.
5476 * New Linux kernel system calls: unshare,
5477 inotify_init, inotify_add_watch, inotify_rm_watch.
5479 * The euidaccess function is now also known by the alias eaccess,
5480 for compatibility with some other systems.
5482 * Timezone data updated to 2006b version.
5486 * The following bugs are resolved with this release:
5488 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5489 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5490 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5491 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5492 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5493 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5495 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5497 * As of this release, GCC 4 can be used to compile the C Library.
5499 * Timezone data updated to 2005m version.
5503 * The following bugs are resolved with this release:
5505 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5506 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5507 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5508 777, 787, 821, 822, 823, 825
5510 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5514 * Support for RFC 3678. Real implementations exist only for Linux so far.
5515 Implemented by Ulrich Drepper.
5517 * nscd can now cache entries persistently. Expiring entries are reloaded.
5518 For speedups the cache can be shared in memory with client processes.
5519 Implemented by Ulrich Drepper.
5521 * nscd can now perform SELinux checks.
5522 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5524 * getaddrinfo queries are now cached. Canonical name lookup is performed
5526 Implemented by Ulrich Drepper.
5528 * The nothrow function attribute is used when headers are used by gcc when
5529 compiling C code. This can avoid significant amounts of exception
5532 * The malloc functions perform more error checking and are stricter when
5533 it comes to reacting on errors. The default action is to terminate
5534 the process after showing an error message. Implemented by Ulrich Drepper.
5536 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5537 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5539 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5540 namespaces using the new function dlmopen(). This feature is of course,
5541 like most other dynamic loading functionality, not available in statically
5542 linked applications. Implemented by Ulrich Drepper.
5544 * Low-overhead boundary checking variants of string and some stdio functions
5545 were added. These are to be used in conjunction with a gcc patch by
5546 Jakub Jelinek which adds calls to these functions if possible.
5547 Implemented by Jakub Jelinek and Ulrich Drepper.
5549 * Old code for several operating systems and machine architectures that
5550 have not been in working condition in a long time have been removed from
5551 the main source tree maintained by the GNU C Library's maintainers.
5552 These files are now reside in the separate `ports' source module
5553 that is usable as an add-on when building the library.
5557 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5558 interrogate the dynamic linker, compatible with the Solaris interface.
5560 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5561 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5563 * getifaddrs now uses the netlink interface on Linux to get its information.
5564 Implemented by Thorsten Kukuk.
5566 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5567 Implemented by Ulrich Drepper.
5569 * support for non-executable stacks on x86 has been added. Changes mostly
5572 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5575 * getaddrinfo now performs destination address selection according to
5580 * Thread-safe interfaces for many functions that access locale data
5581 were added in version 2.3, but these features were omitted from NEWS.
5582 Many functions have variants with an `_l' suffix that take a `locale_t'
5583 object as a parameter rather than consulting the current locale.
5584 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5585 create and maintain `locale_t' objects. Additionally, the new function
5586 `uselocale' sets "the current locale" (as used by functions not so
5587 parameterized) set for an individual thread. These features were added
5588 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5590 * The functions getresuid, getresgid, setresuid, and setresgid, which
5591 have long been available on Linux, are now declared in <unistd.h>
5592 and are now also available on the Hurd.
5594 * ELF thread-local storage support (TLS) now works on x86-64.
5596 * The new dynamic string token $LIB is expanded in shared library names.
5597 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5599 * Aldy Hernandez contributed complete software floating point support for
5600 PowerPC machines with no FPU.
5602 * fexecve is implemented on Linux.
5604 * The `btowc' function should work at least twice as fast due to
5605 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5607 * With approriate thread add-ons cancelable functions are now implemented
5608 in libc.so as well. No need to call the function in libpthread. This
5609 change allowed to finally disable the incorrect and expensive handling
5610 of weak definition in ld.so.
5612 * Yet more PLT entries in libc.so have been removed. We finally arrived
5613 at the bare minimum. Startup times improved appropriately.
5615 * Support for the new Linux/x86 system call interface was added. The
5616 AT_SYSINFO auxiliary vector entry is recognized and handled.
5620 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5623 * iconv (the program and the interface) now accepts empty names (excluding
5624 options like //TRANSLIT) to mean "use charset of current locale".
5626 * localedef can now transliterate characters in strings which are not in
5627 the provided charmap. The information from the input locale is used.
5629 * Prelinking support was added for ELF targets. This requires additional
5630 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5632 * Read-only stdio streams now use mmap to speed up operation by eliminating
5633 copying and buffer underflows. To use add 'm' to the mode string of
5634 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5636 * The malloc functions were completely rewritten by Wolfram Gloger based
5637 on Doug Lea's malloc-2.7.0.c.
5639 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5640 implementation of regex.
5642 * Bruno Haible upgraded the iconv and locale implementation to support
5645 * Contents of the LC_* and LANG environment variables in the CEN style are
5646 not recognized anymore. It never was used. Change by Ulrich Drepper.
5648 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5649 thread-local storage (TLS) ABI on some platforms.
5650 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5652 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5653 EUC-JISX0213, and TSCII.
5655 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5656 BSD-compatible interface for getting all network interface addresses.
5657 Implementation for IPv4 by Roland McGrath.
5659 * Loading of locale data is faster due to the introduction of a locale
5660 archive. Implemented by Roland McGrath and Ulrich Drepper.
5662 * Startup times are significantly reduced by not using exported functions
5663 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5666 * Steven Munroe contributed a port to PowerPC64/Linux.
5670 * The Hurd now uses the GNU libio implementation of stdio rather than the
5671 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5673 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5674 with the same behavior as the Linux system call of the same name.
5678 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5679 128-bit long double format.
5681 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5682 IBM1161, and IBM1162 charsets.
5684 * Andreas Jaeger contributed a port to x86-64/Linux.
5686 * Peter Bruin contributed a port to PowerPC/Hurd.
5688 * libc functions using I/O streams now can handle wide-oriented streams
5691 * optimizations in the dynamic linker. Binaries created by recent binutils
5692 versions start up quicker due to reduced time spent on relocations.
5694 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5698 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5699 asinh, atanh, j0 for the 128-bit long double format.
5701 * Bruno Haible updated all the code handling Unicode in some form to
5702 support Unicode 3.1.
5704 * Speed of regex for single-byte locales is back to previous levels.
5705 Patch by Isamu Hasegawa.
5707 * Alpha, SPARC, and IA-64 now also using floating stacks.
5709 * Startup time of internationalized applications greatly improved through
5710 iconv cache. Use iconvconfig to generate the cache file.
5711 Contributed by Ulrich Drepper.
5713 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5714 severe performance problems. Patch by David Mosberger.
5716 * The Hurd port got a lot more functionality like AIO, various stdio
5717 extensions, etc. Mainly done by Roland McGrath.
5719 * mtrace can now lookup symbols in shared libraries.
5723 * Intel's IA-64 math library is largely integrated. It provides fast and
5724 accurate implementatations for most basic and standard math functions
5725 in float, double, and long double format.
5727 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5728 and asin for the 96-bit long double format and asin, log, tan for the
5729 128-bit long double format.
5731 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5732 The basic double functions exist today. Contributed by Abraham Ziv
5733 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5734 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5736 * An asynchronous name lookup library was added. The interface is designed
5737 after POSIX AIO. The proposal was circulated beforehand to get comments.
5738 No negative ones came in. Implemented by Ulrich Drepper.
5740 * Port to S390/64bit contributed by Martin Schwidefsky
5741 <schwidefsky@de.ibm.com>.
5743 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5744 of functions for Linux/IA-64.
5746 * The RPC code is now thread safe. Threads can now use the same service
5747 of different services at the same time. Patch by Eric Norum
5748 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5750 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5751 family of functions for Linux/S390.
5753 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5754 of functions for Linux/x86.
5756 * Port to Linux/CRIS contributed by Axis Communications.
5760 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5761 we can now check for namespace violations and missing declarations. The
5762 result is that almost all headers are now Unix-compliant (as defined in
5763 the upcoming XPG6). The negative side is that some programs might need
5764 corrections, too, if they depend on the incorrect form of the headers in
5765 previous versions which defined too many symbols and included too many
5768 * regex now handles multibyte character sets correctly.
5769 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5771 * iconv (the program) does now conform to the upcoming XPG6 and handles
5772 charmaps. Instead of the charset names the path of charmaps can be
5773 provided and the conversion happens based on this data.
5774 Contributed by Ulrich Drepper.
5776 * The locale program now provides detailed information about the installed
5781 only lists the names of the supported locales
5785 provides details such as country, language, and codeset name.
5786 Contributed by Ulrich Drepper.
5790 * The gencat program now parses the input file according to the charset
5791 selected by the LC_CTYPE category. This is important for stateful
5792 character sets. To make generating catalogs easier there is a way
5793 to overwrite the charset selected by the locale: before the first
5794 message or $ quote line the catalog can contain a line like
5796 $ codeset=ISO-8859-2
5798 to select the charset (ISO-8859-2 in this case).
5800 Implemented by Shinya Hanataka and Ulrich Drepper.
5802 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5803 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5804 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5806 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5807 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5809 * The LANGUAGE environment variable is now ignored unless the locale is
5810 changed from the default "C" locale.
5812 * The usual bug fixes.
5816 * Greg McGary added runtime support for bounds checking using gcc's
5817 new -fbounded-pointers option. ix86 target is complete. PowerPC
5820 * Thorsten Kukuk added secure mode support to nscd.
5822 * The Berkeley db libraries have been removed.
5824 Related, the nss_db module is now in a separate package since it
5825 obviously requires a database library being available.
5827 * Wide character I/O streams implemented by Ulrich Drepper.
5829 * Functions from the extended socket API added by Ulrich Drepper.
5831 * Functions feenableexcept and fedisableexcept to control the
5832 behaviour of individual exceptions have been added by Andreas Jaeger.
5834 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5836 * The resolver code has been updated from bind 8.2.3-T5B which supports
5837 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5840 This change could in some situations effect backward compatibility. Since
5841 now `_res' is a thread-local instead of a global variable, modifying it
5842 in one thread does not have any effect in other threads.
5844 The resolver library was also extended to allow IPv6 as the transport
5845 protocol for the requests. This work was done by Stig Venaas.
5847 * Compatibility code for K&R C compilers has been removed from the
5848 header files. A ISO C compiler is needed to use the library
5849 (conforming to either C89 or C99 standard).
5851 * Complete rewrite of the localedef program to support multibyte character
5852 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5853 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5854 Implemented by Ulrich Drepper.
5856 Bruno Haible significantly improved the generation and use of the data
5857 structures for the wide character tables.
5859 * Plural handling in gettext implemented by Ulrich Drepper.
5861 * The utmp daemon has been removed.
5863 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5865 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5868 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5870 * POSIX barriers implemented by Kaz Kylheku.
5872 * POSIX spawn function family implemented by Ulrich Drepper.
5874 * POSIX spinlocks are now available.
5876 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5878 * the configure option --enable-kernel=X.Y.Z allows to strip out
5879 compatibility for kernel versions before X.Y.Z. This is currently only
5880 implemented for Linux.
5882 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5883 field sin6_scope_id. This means that all programs using IPv6 should be
5884 recompiled. Don't expect binary compatibility with previous glibc
5887 * various conversion modules for IBM character sets contributed by
5890 * IA-64 port by Jes Sorensen and HJ Lu.
5904 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5906 * New xdr functions are added; some rpc functions are now 64bit clean.
5908 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5910 * Fixed known incompatibilities with glibc 2.0.
5912 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5914 * Optimized a number of functions (especially the ELF dynamic loader).
5916 * Update timezone data files.
5918 * lots of charmaps corrections
5920 * some new locale definitions and charmaps
5925 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5926 conform to POSIX member type requirements. Symbol versions have been
5927 adjusted as needed within the library, and for direct use by applications,
5928 but there is potential for problems if third-party libraries use
5929 struct timeval as part of their interface. This does not present
5930 a problem for X and other "essential" system libraries.
5932 * An additional locale model to support C++ Standard Library locale
5933 model and probably more was implemented by Ulrich Drepper.
5935 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5938 * Miles Bader provided the `argp' function family to support hierachical
5939 command line argument parsing, layered on top of getopt.
5941 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5943 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5946 * scanf recognizes the %a and %A format for scanning floating point numbers.
5948 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5949 information and interfaces for the available integer types.
5951 * about 130 new math functions were added to implement the ISO C9x math
5954 * the new header <complex.h> contains definitions of the complex math
5955 functions from ISO C 9X.
5957 * the new header <tgmath.h> defines generic macros to use complex or
5958 real valued functions.
5960 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5962 * Andreas Jaeger provided a test suite for the math library.
5964 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5966 * Ulrich Drepper added character set conversion functions (iconv).
5968 * Optimized string functions have been added.
5970 * The localedata addon is now part of glibc.
5972 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5974 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5975 daemon for NSS (nscd).
5977 Missing a better place here are some numbers on improvements. Under
5978 Linux 2.1.125 un-tar-ing the kernel sources takes
5982 using local files 12.19s 6.88s 22.91s
5984 using NIS 13.92s 8.91s 26.34s
5986 using NIS & nscd 10.37s 7.34s 25.30s
5988 using NIS+ 27.57s 30.37s 640.46s
5990 using NIS+ & nscd 10.25s 7.83s 26.51s
5992 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5994 Keep in mind that non-namelookup related operations dominate above times.
5995 It was just a common complain that using NIS+ unpacking the kernel is
5998 [1] The old nscd implementation is not available anymore since it was
5999 distributed with glibc up to version 2.0.98 and thus is now replaced.
6001 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6003 * Mark Kettenis provided a Hesiod NSS module.
6005 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6006 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6008 * rcmd can now handle netgroups (Dick Streefland).
6010 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6013 * Support for the IPv6 protocol has been added to the socket API, as per the
6014 latest draft standards.
6016 * Support for Linux 2.2 has been added.
6018 * Interface changes relative to the latest 2.0.x release:
6019 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6020 addseverity NEW: Unix98
6021 alphasort64 NEW: LFS
6022 argp_err_exit_status NEW: argp, GNU ext
6023 argp_error NEW: argp, GNU ext
6024 argp_failure NEW: argp, GNU ext
6025 argp_help NEW: argp, GNU ext
6026 argp_parse NEW: argp, GNU ext
6027 argp_program_bug_address NEW: argp, GNU ext
6028 argp_program_version NEW: argp, GNU ext
6029 argp_program_version_hook NEW: argp, GNU ext
6030 argp_state_help NEW: argp, GNU ext
6031 argp_usage NEW: argp, GNU ext
6032 authdes_create NEW: Secure RPC
6033 authdes_getucred NEW: Secure RPC
6034 authdes_pk_create NEW: Secure RPC
6035 backtrace NEW: GNU ext.
6036 backtrace_symbols NEW: GNU ext.
6037 backtrace_symbols_fd NEW: GNU ext.
6039 cacosf NEW: ISO C 9x
6040 cacosh NEW: ISO C 9x
6041 cacoshf NEW: ISO C 9x
6042 cacoshl NEW: ISO C 9x
6043 cacosl NEW: ISO C 9x
6050 casinf NEW: ISO C 9x
6051 casinh NEW: ISO C 9x
6052 casinhf NEW: ISO C 9x
6053 casinhl NEW: ISO C 9x
6054 casinl NEW: ISO C 9x
6056 catanf NEW: ISO C 9x
6057 catanh NEW: ISO C 9x
6058 catanhf NEW: ISO C 9x
6059 catanhl NEW: ISO C 9x
6060 catanl NEW: ISO C 9x
6061 cbc_crypt NEW: Secure RPC
6065 ccoshf NEW: ISO C 9x
6066 ccoshl NEW: ISO C 9x
6072 cimagf NEW: ISO C 9x
6073 cimagl NEW: ISO C 9x
6074 clearerr_locked REMOVED
6075 clntunix_create NEW: sunrpc ext
6077 clog10 NEW: ISO C 9x
6078 clog10f NEW: ISO C 9x
6079 clog10l NEW: ISO C 9x
6089 cprojf NEW: ISO C 9x
6090 cprojl NEW: ISO C 9x
6092 crealf NEW: ISO C 9x
6093 creall NEW: ISO C 9x
6098 csinhf NEW: ISO C 9x
6099 csinhl NEW: ISO C 9x
6102 csqrtf NEW: ISO C 9x
6103 csqrtl NEW: ISO C 9x
6107 ctanhf NEW: ISO C 9x
6108 ctanhl NEW: ISO C 9x
6110 des_setparity NEW: Secure RPC
6111 ecb_crypt NEW: Secure RPC
6112 endutxent NEW: Unix98
6114 exp10f NEW: ISO C 9x
6115 exp10l NEW: ISO C 9x
6119 fattach NEW: STREAMS
6120 fdetach NEW: STREAMS
6124 feclearexcept NEW: ISO C 9x
6125 fegetenv NEW: ISO C 9x
6126 fegetexceptflag NEW: ISO C 9x
6127 fegetround NEW: ISO C 9x
6128 feholdexcept NEW: ISO C 9x
6130 feraiseexcept NEW: ISO C 9x
6131 ferror_locked REMOVED
6132 fesetenv NEW: ISO C 9x
6133 fesetexceptflag NEW: ISO C 9x
6134 fesetround NEW: ISO C 9x
6135 fetestexcept NEW: ISO C 9x
6136 feupdateenv NEW: ISO C 9x
6137 fflush_locked REMOVED
6141 fgets_unlocked NEW: GNU ext.
6142 fileno_locked REMOVED
6154 fputc_locked REMOVED
6155 fputs_unlocked NEW: GNU ext.
6156 fread_unlocked NEW: GNU ext.
6161 fstatvfs NEW: Unix98
6165 ftruncate64 NEW: LFS
6167 fwrite_unlocked NEW: GNU ext.
6168 gai_strerror NEW: IPv6
6172 getchar_locked REMOVED
6174 getdate_err NEW: Unix98
6175 getdate_r NEW: GNU ext.
6177 getnameinfo NEW: IPv6
6178 getnetname NEW: Secure RPC
6179 getpmsg NEW: STREAMS
6180 getpt NEW: Unix98 PTY
6181 getrlimit64 NEW: LFS
6182 getutxent NEW: Unix98
6183 getutxid NEW: Unix98
6184 getutxline NEW: Unix98
6185 glob64 NEW: GNU ext.
6186 globfree64 NEW: GNU ext.
6187 gnu_get_libc_release NEW: GNU ext.
6188 gnu_get_libc_version NEW: GNU ext.
6189 grantpt NEW: Unix98 PTY
6190 host2netname NEW: Secure RPC
6192 iconv_close NEW: iconv
6193 iconv_open NEW: iconv
6194 if_freenameindex NEW: IPv6
6195 if_indextoname NEW: IPv6
6196 if_nameindex NEW: IPv6
6197 if_nametoindex NEW: IPv6
6198 in6addr_any NEW: IPv6
6199 in6addr_loopback NEW: IPv6
6200 inet6_isipv4mapped NEW: IPv6
6201 isastream NEW: STREAMS
6202 iswblank NEW: GNU ext.
6203 key_decryptsession NEW: Secure RPC
6204 key_decryptsession_pk NEW: Secure RPC
6205 key_encryptsession NEW: Secure RPC
6206 key_encryptsession_pk NEW: Secure RPC
6207 key_gendes NEW: Secure RPC
6208 key_get_conv NEW: Secure RPC
6209 key_secretkey_is_set NEW: Secure RPC
6210 key_setnet NEW: Secure RPC
6211 key_setsecret NEW: Secure RPC
6212 llrint NEW: ISO C 9x
6213 llrintf NEW: ISO C 9x
6214 llrintl NEW: ISO C 9x
6215 llround NEW: ISO C 9x
6216 llroundf NEW: ISO C 9x
6217 llroundl NEW: ISO C 9x
6222 lrintf NEW: ISO C 9x
6223 lrintl NEW: ISO C 9x
6224 lround NEW: ISO C 9x
6225 lroundf NEW: ISO C 9x
6226 lroundl NEW: ISO C 9x
6228 makecontext NEW: Unix98
6229 mempcpy NEW: GNU ext.
6232 modify_ldt NEW: kernel
6236 nearbyint NEW: ISO C 9x
6237 nearbyintf NEW: ISO C 9x
6238 nearbyintl NEW: ISO C 9x
6239 netname2host NEW: Secure RPC
6240 netname2user NEW: Secure RPC
6241 nexttoward NEW: ISO C 9x
6242 nexttowardf NEW: ISO C 9x
6243 nexttowardl NEW: ISO C 9x
6247 passwd2des NEW: Secure RPC
6249 pow10f NEW: GNU ext.
6250 pow10l NEW: GNU ext.
6253 printf_size NEW: GNU ext.
6254 printf_size_info NEW: GNU ext.
6255 profil_counter REMOVED
6256 pthread_mutexattr_getkind_np REPLACED
6257 pthread_mutexattr_setkind_np REPLACED
6258 ptsname NEW: Unix98 PTY
6259 ptsname_r NEW: Unix98 PTY
6261 putchar_locked REMOVED
6262 putgrent NEW: GNU ext.
6264 putpmsg NEW: STREAMS
6265 pututxline NEW: Unix98
6269 readdir64_r NEW: LFS
6270 remquo NEW: ISO C 9x
6271 remquof NEW: ISO C 9x
6272 remquol NEW: ISO C 9x
6274 roundf NEW: ISO C 9x
6275 roundl NEW: ISO C 9x
6277 scalbln NEW: ISO C 9x
6278 scalblnf NEW: ISO C 9x
6279 scalblnl NEW: ISO C 9x
6281 sendfile NEW: kernel
6282 setcontext NEW: Unix98
6283 setrlimit64 NEW: LFS
6284 setutxent NEW: Unix98
6286 sigignore NEW: Unix98
6287 sigqueue NEW: POSIX.1b
6288 sigrelse NEW: Unix98
6289 sigset NEW: POSIX.1b
6290 sigtimedwait NEW: POSIX.1b
6291 sigwaitinfo NEW: POSIX.1b
6292 sincos NEW: GNU ext.
6293 sincosf NEW: GNU ext.
6294 sincosl NEW: GNU ext.
6298 strcasestr NEW: GNU ext.
6299 strtoimax NEW: ISO C 9x
6300 strtoumax NEW: ISO C 9x
6301 strverscmp NEW: GNU ext.
6302 svcauthdes_stats NEW: Secure RPC
6303 svcunix_create NEW: sunrpc etx
6304 svcunixfd_create NEW: sunrpc ext
6305 swapcontext NEW: Unix98
6306 tcgetsid NEW: Unix98 PTY
6307 tdestroy NEW: GNU ext.
6308 tgamma NEW: ISO C 9x
6309 tgammaf NEW: ISO C 9x
6310 tgammal NEW: ISO C 9x
6314 truncf NEW: ISO C 9x
6315 truncl NEW: ISO C 9x
6317 unlockpt NEW: Unix98 PTY
6318 updwtmpx NEW: Unix98
6319 user2netname NEW: Secure RPC
6320 utmpxname NEW: Unix98
6321 versionsort NEW: GNU ext.
6322 versionsort64 NEW: GNU ext.
6324 wcscasecmp NEW: GNU ext.
6325 wcsncasecmp NEW: GNU ext.
6326 wcsnlen NEW: GNU ext.
6327 wcstoimax NEW: ISO C 9x
6328 wcstoll NEW: ISO C 9x
6329 wcstoull NEW: ISO C 9x
6330 wcstoumax NEW: ISO C 9x
6332 wordexp NEW: POSIX.2
6333 wordfree NEW: POSIX.2
6334 write_profiling REMOVED
6335 xdecrypt NEW: Secure RPC
6336 xdr_authdes_cred NEW: Secure RPC
6337 xdr_authdes_verf NEW: Secure RPC
6338 xdr_cryptkeyarg NEW: Secure RPC
6339 xdr_cryptkeyarg2 NEW: Secure RPC
6340 xdr_cryptkeyres NEW: Secure RPC
6341 xdr_getcredres NEW: Secure RPC
6342 xdr_key_netstarg NEW: Secure RPC
6343 xdr_key_netstres NEW: Secure RPC
6344 xdr_keybuf NEW: Secure RPC
6345 xdr_keystatus NEW: Secure RPC
6346 xdr_netnamestr NEW: Secure RPC
6347 xdr_sizeof NEW: Secure RPC
6348 xdr_unixcred NEW: sunrpc ext
6349 xencrypt NEW: Secure RPC
6350 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6361 * inet_ntoa is thread-safe
6363 * updwtmp is moved from libutil to libc
6365 * rewrite of cbrt function
6367 * update of timezone data
6381 * add atoll function
6383 * fix complex problems in Berkeley DB code
6385 * fix math functions
6389 * fixed lots of header problems (especially Linux/GNU specific)
6391 * dynamic loader preserves all registers
6393 * Roland McGrath provided support for handling of auxiliary objects in
6394 the ELF dynamic loader.
6396 * support for parallel builds is improved
6400 * GNU extensions are no longer declared by default. To enable them you
6401 must define the macro `_GNU_SOURCE' in your program or compile with
6404 * The library has changed from using GNU ld symbol aliases to using weak
6405 symbols where available. The ELF object file format supports weak
6406 symbols; GNU ld also supports weak symbols in the a.out format. (There
6407 is also now support for other GNU ld extensions in ELF. Use the
6408 `--with-elf' option to configure to indicate you have ELF, and
6409 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6410 of many files which contained only symbol aliases, reducing the size of
6411 the source and the compiled library; many other files were renamed to
6412 less cryptic names previously occupied by the symbol alias files.
6413 There is a new header file <elf.h> for programs which operate on
6414 files in the ELF format.
6416 * Converted to Autoconf version 2, so `configure' has more options.
6417 Run `configure --help' to see the details.
6419 * The library can now be configured to build profiling, highly-optimized
6420 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6421 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6422 `configure' enable building these extra libraries. The shared library is
6423 built by default when using both ELF and GNU ld. When shared libraries
6424 are enabled, the new library `-ldl' is available for arbitrary run-time
6425 loading of shared objects; its interface is defined in <dlfcn.h>. The
6426 new header file <link.h> gives access to the internals of the run-time
6427 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6428 application of same name on other systems and it provides information
6429 about dynamically linked binaries.
6431 * The C library now provides the run-time support code for profiling
6432 executables compiled with `-pg'. Programs can control the profiling code
6433 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6434 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6435 the support for this file format was contributed by David Mosberger-Tang.
6437 * The math code has been replaced with a math library based on fdlibm from
6438 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6439 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6440 functions. The math functions now reside in a separate library, so
6441 programs using them will need to use `-lm' their linking commands.
6443 * John C. Bowman contributed optimized ix87 assembler inline functions.
6445 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6446 mechanism similar to that found in Solaris 2. This is now used for the
6447 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6448 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6449 file controls what services are used for each individual database. This
6450 works by loading shared libraries with names specified in `nsswitch.conf',
6451 so service modules can be changed or added at any time without even
6452 relinking any program. Currently there are the file, db, and NIS based
6453 NSS services available.
6455 * The new functions `strtoq' and `strtouq' parse integer values from
6456 strings, like `strtol' and `strtoul', but they return `long long int' and
6457 `unsigned long long int' values, respectively (64-bit quantities).
6459 * The new functions `strtof' and `strtold' parse floating-point values from
6460 strings, like `strtod', but they return `float' and `long double' values,
6461 respectively (on some machines `double' and `long double' are the same).
6463 * Ulrich Drepper has contributed new implementations of the floating-point
6464 printing and reading code used in the `printf' family of functions and
6465 `strtod', `strtof', and `strtold'. These new functions are perfectly
6466 accurate, and much faster than the old ones.
6468 * The implementation of the POSIX locale model was completely rewritten by
6469 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6470 to compile the POSIX locale definition.
6472 * The former dummy implementations of the strcoll and strxfrm function are
6473 now replaced by fully functional code contributed by Ulrich Drepper. The
6474 collation information comes from the POSIX locale definitions.
6476 * The new header <langinfo.h> defines an interface for accessing
6477 various locale-dependent data (using the locale chosen with `setlocale').
6479 * Ulrich Drepper has contributed a new suite of functions for operation on
6480 wide-character and multibyte-character strings, in <wchar.h>;
6481 and classification and case conversion of wide characters, in <wctype.h>.
6482 These new functions are conforming to the ISO C, Amendement 1 specification.
6484 * There is now a second implementation of the standard I/O library available.
6485 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6486 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6488 * You can now use positional parameter specifications in format strings
6489 for the `printf' and `scanf' families of functions. For example,
6490 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6491 ``Number 6, Mr Jones''. This is mainly useful when providing different
6492 format strings for different languages, whose grammars may dictate
6493 different orderings of the values being printed. To support this
6494 feature, the interface for `register_printf_handler' has changed; see
6495 the header file <printf.h> for details.
6497 * The `printf' and `scanf' families of functions now understand a new
6498 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6499 to group numbers as indicated by the locale; for `scanf' and friends, this
6500 says to accept as valid only a number with all the proper grouping
6501 separators in the right places. In the default "C" locale, numbers are
6502 not grouped; but locales for specific countries will define the usual
6503 conventions (i.e. separate thousands with `,' in the US locale).
6505 * The pgrp functions have been regularized, slightly incompatibly but much
6506 less confusingly. The core functions are now `getpgid' and `setpgid',
6507 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6508 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6509 provided for compatibility. There is no longer an incompatible `getpgrp'
6510 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6512 * The new header file <fts.h> and suite of functions simplify programs that
6513 operate on directory trees. This code comes from 4.4 BSD.
6515 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6516 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6517 NSS scheme used in glibc.
6519 * There is a new malloc debugging hook `__memalign_hook'.
6521 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6522 `unsigned int' in <sys/types.h>. These are for compatibility only and
6523 their use is discouraged.
6525 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6526 done differently, so that it works even without GNU ld.
6528 * New function `euidaccess' checks allowed access to a file like `access',
6529 but using the effective IDs instead of the real IDs.
6531 * The time zone data files have been updated for the latest and greatest
6532 local time conventions of the countries of the world.
6534 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6537 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6538 for formatting floating-point numbers. They are provided only for
6539 compatibility; new programs should use `sprintf' instead. There are
6540 also equivalent function for the `long double' floating-point type and
6541 all functions also exist in a reentrant form.
6543 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6544 functions for maintaining the login-record files (primarily of use to
6545 system programs such as `login'), and convenient functions for
6546 allocating and initializing a pseudo-terminal (pty) device.
6548 * Ulrich Drepper has contributed new support for System V style
6549 shared memory and IPC on systems that support it.
6551 * Ulrich Drepper has contributed several miscellaneous new functions found
6552 in System V: The `hsearch' family of functions provide an effective
6553 implementation of hash tables; `a64l' and `l64a' provide a very simple
6554 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6557 * Ulrich Drepper has contributed new reentrant counterparts for the
6558 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6560 * Ulrich Drepper has contributed new, highly-optimized versions of several
6561 string functions for the i486/Pentium family of processors.
6563 * Ulrich Drepper has updated the Linux-specific code, based largely
6564 on work done in Hongjiu Lu's version of GNU libc for Linux.
6565 The GNU library now supports Linux versions 2.0.10 and later,
6566 using the ELF object file format (i[3456]86-*-linux).
6568 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6570 * David Mosberger-Tang and Richard Henderson have ported the C library
6571 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6572 dynamic linking support for ELF/Alpha.
6574 * Richard Henderson contributed several Alpha optimized assembler function
6575 for arithmetic and string handling.
6577 * Ulrich Drepper has contributed a new set of message catalog functions to
6578 support multiple languages using the <libintl.h> interface, for use with
6579 his new package GNU gettext. Translation volunteers have contributed
6580 catalogs of the library's messages in Spanish, German, and Korean.
6582 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6583 program and the `catgets' function for reading the catalog files it
6584 creates. (The <libintl.h> interface is preferred; we include the
6585 <nl_types.h> interface using `catgets' only for source compatibility with
6586 programs already written to use it.)
6588 * New header file <values.h> gives SVID-compatible names for <limits.h>
6591 * Various new macros, declarations, and small header files for compatibility
6594 * New function `group_member' is a convenient way to check if a process has
6595 a given effective group ID.
6597 * When using GCC 2.7 and later, the socket functions are now declared in a
6598 special way so that passing an argument of type `struct sockaddr_in *',
6599 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6600 `struct sockaddr *' type, does not generate a type-clash warning.
6602 * New function `error' declared in header file <error.h> is a convenient
6603 function for printing error messages and optionally exiting; this is the
6604 canonical function used in GNU programs. The new functions `err', `warn',
6605 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6606 doing the same thing.
6608 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6609 POSIX.2 `glob' function to do ~ and {...} expansion.
6611 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6612 `clearenv' which is used in POSIX.9 is also available.
6614 * New function `getsid' returns session ID number on systems that support it.
6616 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6617 files <db.h> and <mpool.h> provide a rich set of functions for several
6618 types of simple databases stored in memory and in files, and <ndbm.h> is
6619 an old `ndbm'-compatible interface using the `db' functions. Link with
6620 `-ldb' to get these functions.
6622 * New macro `strdupa' copies a string like `strdup', but uses local stack
6623 space from `alloca' instead of dynamic heap space from `malloc'.
6625 * New function `strnlen' is like `strlen' but searches only a given maximum
6626 number of characters for the null terminator. `stpncpy', `strndup' and
6627 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6630 * New function `statfs' in header <sys/statfs.h>.
6632 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6633 provide convenient functions for operating on blocks of null-terminated
6636 * A new suite of functions in <utmp.h> handle all the details of reading
6637 and writing the utmp file.
6639 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6642 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6643 completely POSIX compliant and also implemented the extended functionality
6644 to handle alternate digit representation and alternate era date formats.
6646 * Ulrich Drepper provided an implementation of the `strptime' function
6647 defined in XPG4.2 which transforms a string into a `struct tm' value.
6649 * Paul Eggert provided the tzselect shell script as part of the timezone
6650 code. The shell script makes it easy to select the correct timezone
6653 * The implementation of the malloc family of functions is completely replaced
6654 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6655 The implementation uses the mmap function (if available) and it is
6656 optimized for the use in multi threaded programs.
6658 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6659 functions. This new functionality is usable by specifying a special
6660 salt string and it is compatible with implementation on *BSD systems.
6662 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6663 `getsubopt' to handle second level command line options, `bsd_signal'
6664 to access BSD style `signal' functionality, the obsolete `regexp' style
6667 * the `lchown' function is available on system which support this
6670 * The implementation of the shadow password handling function was contributed
6673 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6675 * POSIX.1g support was added. The <sys/select.h> header is available,
6676 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6677 implementation of `getaddrinfo'.
6681 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6683 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6684 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6686 * The new function `daemon' from 4.4 BSD is useful for server programs that
6687 want to put themselves in the background.
6689 * Joel Sherrill has contributed support for several standalone boards that
6690 run without an operating system.
6692 * `printf', `scanf' and friends now accept a `q' type modifier for long
6693 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6695 * All of the code taken from BSD (notably most of the math and networking
6696 routines) has been updated from the BSD 4.4-Lite release.
6698 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6700 * The new functions `getdomainname' and `setdomainname' fetch or change the
6701 YP/NIS domain name. These are system calls which exist on systems which
6704 * The time zone data files have been updated for the latest international
6707 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6708 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6712 * The C library now includes support for Sun RPC, from Sun's free
6713 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6714 are included. (There is still no support for YP.)
6716 * Tom Quinn has contributed a port of the C library to SGI machines running
6717 Irix 4 (mips-sgi-irix4).
6719 * The new `lockf' function is a simplified interface to the locking
6720 facilities of `fcntl', included for compatibility.
6722 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6724 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6726 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6729 * The error message printed by `assert' for a failed assertion now includes
6730 the name of the program (if using GNU ld) and the name of the calling
6731 function (with versions of GCC that support this).
6733 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6735 * The library now includes the <sys/mman.h> header file and memory
6736 management functions `mmap', `munmap', `mprotect', `msync', and
6737 `madvise', on systems that support those facilities.
6739 * The interface for `mcheck' has changed slightly: the function called to
6740 abort the program when an allocation inconsistency is detected now takes
6741 an argument that indicates the type of failure. The new function
6742 `mprobe' lets you request a consistency check for a particular block at
6743 any time (checks are normally done only when you call `free' or `realloc'
6746 * It is now possible to easily cross-compile the C library, building on one
6747 system a library to run on another machine and/or operating system. All
6748 you need to do is set the variable `HOST_CC' in `configparms' to the
6749 native compiler for programs to run on the machine you are building on (a
6750 few generator programs are used on Unix systems); set `CC' to the
6753 * The new function `fexecve' (only implemented on the GNU system) executes
6754 a program file given a file descriptor already open on the file.
6758 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6759 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6761 * You can set the variable `libprefix' in `configparms' to specify a prefix
6762 to be prepended to installed library files; this makes it easy to install
6763 the GNU C library to be linked as `-lgnuc' or whatever.
6765 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6766 copies a limited number of characters from a string, and returns the
6767 address of the last character written.
6769 * You no longer need to check for whether the installed `stddef.h' is
6770 compatible with the GNU C library. configure now checks for you.
6772 * You can now define a per-stream `fileno' function to convert the
6773 stream's cookie into an integral file descriptor.
6775 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6776 allocates zero bytes of storage, and returns a unique pointer which
6777 you can pass to `realloc' or `free'. The behavior is undefined if
6778 you dereference this pointer.
6780 * The C library now runs on Sony NEWS m68k machines running either
6781 NewsOS 3 or NewsOS 4.
6783 * The new `syscall' function is a system-dependent primitive function
6784 for invoking system calls. It has the canonical behavior on Unix
6785 systems, including unreliable return values for some calls (such as
6786 `pipe', `fork' and `getppid').
6788 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6789 to `EAGAIN', which is the preferred name. On systems whose kernels
6790 use two distinct codes, the C library now translates EWOULDBLOCK to
6791 EAGAIN in every system call function.
6795 * The GNU C Library Reference Manual is now distributed with the library.
6796 `make dvi' will produce a DVI file of the printed manual.
6797 `make info' will produce Info files that you can read on line using C-h i
6798 in Emacs or the `info' program.
6799 Please send comments on the manual to bug-glibc-manual@gnu.org.
6801 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6803 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6805 * Jason Merrill has contributed a port to the Sequent Symmetry running
6806 Dynix version 3 (i386-sequent-dynix).
6808 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6809 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6811 * New function `memory_warnings' lets you arrange to get warnings when
6812 malloc is running out of memory to allocate, like Emacs gives you.
6814 * The C library now contains the relocating allocator used in Emacs 19 for
6815 its editing buffers. This allocator (ralloc) minimizes allocation
6816 overhead and fragmentation by moving allocated regions around whenever it
6817 needs to. You always refer to a ralloc'd region with a "handle" (a
6818 pointer to a pointer--an object of type `void **').
6820 * There is a new `printf' format: `%m' gives you the string corresponding
6821 to the error code in `errno'.
6823 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6824 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6825 pass, the `a' modifier says to fill in a `char **' you pass with a
6828 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6829 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6830 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6832 * `mkstemp' is a traditional Unix function to atomically create and open a
6833 uniquely-named temporary file.
6837 * The standard location for the file that says what the local timezone is
6838 has changed again. It is now `/usr/local/etc/localtime' (or more
6839 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6841 * The distribution no longer contains any files with names longer than 14
6844 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6845 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6847 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6851 * The configuration process has changed quite a bit. The `configure'
6852 script is now used just like the configuration scripts for other GNU
6853 packages. The `sysdeps' directory hierarchy is much rearranged.
6854 The file `INSTALL' explains the new scheme in detail.
6856 * The header files no longer need to be processed into ANSI C and
6857 traditional C versions. There is just one set of files to install, and
6858 it will work with ANSI or old C compilers (including `gcc -traditional').
6860 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6861 MIPS DECStation running Ultrix 4.
6863 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6864 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6865 made itself into a shared library.
6867 * Yet further improved support for the i386, running 4.3 BSD-like systems
6868 (such as Mach 3 with the Unix single-server), or System V.
6870 * New function `strncasecmp' to do case-insensitive string comparison
6871 with limited length.
6873 * New function `strsep' is a reentrant alternative to `strtok'.
6875 * New functions `scandir' and `alphasort' for searching directories.
6877 * New function `setenv' is a better interface to `putenv'.
6879 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6880 function for traversing a directory tree.
6882 * The GNU obstack package is now also part of the C library.
6883 The new function `open_obstack_stream' creates a stdio stream that
6884 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6885 formatted output directly to an obstack.
6887 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6888 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6890 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6892 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6893 things to your strings.
6895 * There are some new test programs: test-fseek, testmb, and testrand.
6897 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6898 These ports are not finished, but are a good starting place for really
6899 supporting those systems.
6901 * `/etc/localtime' is now the standard location for the file that says what
6902 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6903 This follows the general principle that `/etc' is the place for all local
6904 configuration files.
6906 * The C library header files now use `extern "C"' when used by the C++
6907 compiler, so the C library should now work with C++ code.
6909 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6910 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6913 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6914 function which uses the `merge sort' algorithm, and is said to be
6915 significantly faster than the old GNU `qsort' function. Merge sort is
6916 now the standard `qsort' function. The new algorithm can require a lot
6917 of temporary storage; so, the old sorting function is called when the
6918 required storage is not available.
6920 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6921 provides the Unix `crypt' function, plus some other entry points.
6923 * The code and header files taken from 4.4 BSD have been updated with the
6924 latest files released from Berkeley.
6926 ----------------------------------------------------------------------
6929 Permission is granted to anyone to make or distribute verbatim copies
6930 of this document as received, in any medium, provided that the
6931 copyright notice and this permission notice are preserved,
6932 thus giving the recipient permission to redistribute in turn.
6934 Permission is granted to distribute modified versions
6935 of this document, or of portions of it,
6936 under the above conditions, provided also that they
6937 carry prominent notices stating who last changed them.
6940 version-control: never