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 functions posix_spawnattr_tcsetpgrp_np and posix_spawnattr_tcgetpgrp_np
133 have been added, enabling posix_spawn and posix_spawnp to set the
134 controlling terminal in the new process in a race free manner. These
135 functions are GNU extensions.
137 Deprecated and removed features, and other changes affecting compatibility:
139 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
140 has been removed since the first PT_LOAD segment is no longer executable
141 due to defaulting to -z separate-code.
143 * The r_version update in the debugger interface makes the glibc binary
144 incompatible with GDB binaries built without the following commits:
146 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
147 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
149 when audit modules or dlmopen are used.
151 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
153 * The --enable-static-pie option is no longer available. The glibc build
154 configuration script now automatically detects static-pie support in the
155 toolchain and architecture and enables it if available.
157 * The catchsegv script and associated libSegFault.so shared object have
158 been removed. There are widely-deployed out-of-process alternatives for
159 catching coredumps and backtraces.
161 * Support for prelink will be removed in the next release; this includes
162 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
163 variables and their functionality in the dynamic loader.
165 Changes to build and runtime requirements:
167 [Add changes to build and runtime requirements here]
169 Security related changes:
171 CVE-2022-23219: Passing an overlong file name to the clnt_create
172 legacy function could result in a stack-based buffer overflow when
173 using the "unix" protocol. Reported by Martin Sebor.
175 CVE-2022-23218: Passing an overlong file name to the svcunix_create
176 legacy function could result in a stack-based buffer overflow.
178 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
179 function could result in a memory leak and potential access of
180 uninitialized memory. Reported by Qualys.
182 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
183 function may result in an off-by-one buffer underflow and overflow
184 when the current working directory is longer than PATH_MAX and also
185 corresponds to the / directory through an unprivileged mount
186 namespace. Reported by Qualys.
188 The following bugs are resolved with this release:
190 [The release manager will add the list generated by
191 scripts/list-fixed-bugs.py just before the release.]
198 * In order to support smoother in-place-upgrades and to simplify
199 the implementation of the runtime all functionality formerly
200 implemented in the libraries libpthread, libdl, libutil, libanl has
201 been integrated into libc. New applications do not need to link with
202 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
203 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
204 provided, so that the linker options keep working. Applications which
205 have been linked against glibc 2.33 or earlier continue to load the
206 corresponding shared objects (which are now empty). The integration
207 of those libraries into libc means that additional symbols become
208 available by default. This can cause applications that contain weak
209 references to take unexpected code paths that would only have been
210 used in previous glibc versions when e.g. preloading libpthread.so.0,
211 potentially exposing application bugs.
213 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
214 PTHREAD_STACK_MIN is no longer constant and is redefined to
215 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
216 sets for modern architectural features like Arm SVE.
218 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
219 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
220 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
221 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
222 dynamic sized register sets for modern architectural features like
225 * The dynamic linker implements the --list-diagnostics option, printing
226 a dump of information related to IFUNC resolver operation and
227 glibc-hwcaps subdirectory selection.
229 * On Linux, the function execveat has been added. It operates similar to
230 execve and it is is already used to implement fexecve without requiring
231 /proc to be mounted. However, different than fexecve, if the syscall is not
232 supported by the kernel an error is returned instead of trying a fallback.
234 * The ISO C2X function timespec_getres has been added.
236 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
237 C2X, is supported to enable declarations of functions defined in Annex F
238 of C2X. Those declarations are also enabled when
239 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
240 defined, and when _GNU_SOURCE is defined.
242 * On powerpc64*, glibc can now be compiled without scv support using the
243 --disable-scv configure option.
245 * Add support for 64-bit time_t on configurations like x86 where time_t
246 is traditionally 32-bit. Although time_t still defaults to 32-bit on
247 these configurations, this default may change in future versions.
248 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
249 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
250 only enabled for Linux and the full support requires a minimum kernel
253 * The main gconv-modules file in glibc now contains only a small set of
254 essential converter modules and the rest have been moved into a supplementary
255 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
256 in the same GCONV_PATH. Similarly, external converter modules directories
257 may have supplementary configuration files in a gconv-modules.d directory
258 with names ending with .conf to logically classify the converter modules in
261 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
262 to configure the size of the thread stack cache.
264 * The function _Fork has been added as an async-signal-safe fork replacement
265 since Austin Group issue 62 droped the async-signal-safe requirement for
266 fork (and it will be included in the future POSIX standard). The new _Fork
267 function does not run any atfork function neither resets any internal state
268 or lock (such as the malloc one), and only sets up a minimal state required
269 to call async-signal-safe functions (such as raise or execve). This function
270 is currently a GNU extension.
272 * On Linux, the close_range function has been added. It allows efficiently
273 closing a range of file descriptors on recent kernels (version 5.9).
275 * The function closefrom has been added. It closes all file descriptors
276 greater than or equal to a given integer. This function is a GNU extension,
277 although it is also present in other systems.
279 * The posix_spawn_file_actions_addclosefrom_np function has been added,
280 enabling posix_spawn and posix_spawnp to close all file descriptors greater
281 than or equal to a given integer. This function is a GNU extension,
282 although Solaris also provides a similar function.
284 * When invoked explicitly, the dynamic linker now uses the kernel to
285 execute programs that do not have any dynamic dependency (that is,
286 they are statically linked). This feature is Linux-specific.
288 * The audit libraries will avoid unnecessary slowdown if it is not required
289 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
291 Deprecated and removed features, and other changes affecting compatibility:
293 * The function pthread_mutex_consistent_np has been deprecated; programs
294 should use the equivalent standard function pthread_mutex_consistent
297 * The function pthread_mutexattr_getrobust_np has been deprecated;
298 programs should use the equivalent standard function
299 pthread_mutexattr_getrobust instead.
301 * The function pthread_mutexattr_setrobust_np has been deprecated;
302 programs should use the equivalent standard function
303 pthread_mutexattr_setrobust instead.
305 * The function pthread_yield has been deprecated; programs should use
306 the equivalent standard function sched_yield instead.
308 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
310 * Various rarely-used functions declared in <resolv.h> and
311 <arpa/nameser.h> have been deprecated. Applications are encouraged to
312 use dedicated DNS processing libraries if applicable. For <resolv.h>,
313 this affects the functions dn_count_labels, fp_nquery, fp_query,
314 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
315 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
316 p_type, putlong, putshort, res_hostalias, res_isourserver,
317 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
318 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
319 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
320 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
322 * Various symbols previously defined in libresolv have been moved to libc
323 in order to prepare for libresolv moving entirely into libc (see earlier
324 entry for merging libraries into libc). The symbols __dn_comp,
325 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
326 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
327 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
328 __res_search, __res_send formerly in libresolv have been renamed and no
329 longer have a __ prefix. They are now available in libc.
331 * The pthread cancellation handler is now installed with SA_RESTART and
332 pthread_cancel will always send the internal SIGCANCEL on a cancellation
333 request. It should not be visible to applications since the cancellation
334 handler should either act upon cancellation (if asynchronous cancellation
335 is enabled) or ignore the cancellation internal signal. However there are
336 buggy kernel interfaces (for instance some CIFS versions) that could still
337 see a spurious EINTR error when cancellation interrupts a blocking syscall.
339 * Previously, glibc installed its various shared objects under versioned
340 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
341 were provided as symbolic links. Starting with glibc 2.34, the shared
342 objects are installed under their ABI sonames directly, without
343 symbolic links. This increases compatibility with distribution
344 package managers that delete removed files late during the package
345 upgrade or downgrade process.
347 * The symbols mallwatch and tr_break are now deprecated and no longer used in
348 mtrace. Similar functionality can be achieved by using conditional
349 breakpoints within mtrace functions from within gdb.
351 * The __morecore and __after_morecore_hook malloc hooks and the default
352 implementation __default_morecore have been removed from the API. Existing
353 applications will continue to link against these symbols but the interfaces
354 no longer have any effect on malloc.
356 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
357 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
358 disabled by default in the main C library. Users looking to use these
359 features now need to preload a new debugging DSO libc_malloc_debug.so to get
360 this functionality back.
362 * The deprecated functions malloc_get_state and malloc_set_state have been
363 moved from the core C library into libc_malloc_debug.so. Legacy applications
364 that still use these functions will now need to preload libc_malloc_debug.so
365 in their environment using the LD_PRELOAD environment variable.
367 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
368 __memalign_hook and __free_hook are now removed from the API. Compatibility
369 symbols are present to support legacy programs but new applications can no
370 longer link to these symbols. These hooks no longer have any effect on glibc
371 functionality. The malloc debugging DSO libc_malloc_debug.so currently
372 supports hooks and can be preloaded to get this functionality back for older
373 programs. However this is a transitional measure and may be removed in a
374 future release of the GNU C Library. Users may port away from these hooks by
375 writing and preloading their own malloc interposition library.
377 Changes to build and runtime requirements:
379 * On Linux, the shm_open, sem_open, and related functions now expect the
380 file shared memory file system to be mounted at /dev/shm. These functions
381 no longer search among the system's mount points for a suitable
382 replacement if /dev/shm is not available.
384 Security related changes:
386 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
387 a request for netgroup lookup, may crash due to a double-free,
388 potentially resulting in degraded service or Denial of Service on the
389 local system. Reported by Chris Schanzle.
391 CVE-2021-33574: The mq_notify function has a potential use-after-free
392 issue when using a notification type of SIGEV_THREAD and a thread
393 attribute with a non-default affinity mask.
395 CVE-2021-35942: The wordexp function may overflow the positional
396 parameter number when processing the expansion resulting in a crash.
397 Reported by Philippe Antoine.
399 The following bugs are resolved with this release:
401 [4737] libc: fork is not async-signal-safe
402 [5781] math: Slow dbl-64 sin/cos/sincos for special values
403 [10353] libc: Methods for deleting all file descriptors greater than
404 given integer (closefrom)
405 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
406 name containing multi-byte character(s)
407 [14469] math: Inaccurate j0f function
408 [14470] math: Inaccurate j1f function
409 [14471] math: Inaccurate y0f function
410 [14472] math: Inaccurate y1f function
411 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
413 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
414 crashes if it fails dlsym() twice
415 [15648] nptl: multiple definition of `__lll_lock_wait_private'
416 [16063] nptl: Provide a pthread_once variant in libc directly
417 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
418 [17145] libc: syslog with LOG_CONS leaks console file descriptor
419 [17183] manual: description of ENTRY struct in <search.h> in glibc
421 [18435] nptl: pthread_once hangs when init routine throws an exception
422 [18524] nptl: Missing calloc error checking in
423 __cxa_thread_atexit_impl
424 [19329] dynamic-link: dl-tls.c assert failure at concurrent
425 pthread_create and dlopen
426 [19366] nptl: returning from a thread should disable cancellation
427 [19511] nptl: 8MB memory leak in pthread_create in case of failure
428 when non-root user changes priority
429 [20802] dynamic-link: getauxval NULL pointer dereference after static
431 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
432 [22057] malloc: malloc_usable_size is broken with mcheck
433 [22668] locale: LC_COLLATE: the last character of ellipsis is not
435 [23323] libc: [RFE] CSU startup hardening.
436 [23328] malloc: Remove malloc hooks and ensure related APIs return no
438 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
439 $PLATFORM, $ORIGIN) crashes
440 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
441 [23554] nptl: pthread_getattr_np reports wrong stack size with
443 [24106] libc: Bash interpreter in ldd script is taken from host
444 [24773] dynamic-link: dlerror in an secondary namespace does not use
445 the right free implementation
446 [25036] localedata: Update collation order for Swedish
447 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
448 shm_open to pick wrong directory
449 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
450 crash in IFUNC resolver due to stack canary (--enable-stack-
452 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
453 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
454 [27111] dynamic-link: pthread_create and tls access use link_map
455 objects that may be concurrently freed by dlclose
456 [27132] malloc: memusagestat is linked to system librt, leading to
457 undefined symbols on major version upgrade
458 [27136] dynamic-link: dtv setup at thread creation may leave an entry
460 [27249] libc: libSegFault.so does not output signal number properly
461 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
463 [27318] dynamic-link: glibc fails to load binaries when built with
464 -march=sandybridge: CPU ISA level is lower than required
465 [27343] nss: initgroups() SIGSEGVs when called on a system without
466 nsswich.conf (in a chroot)
467 [27346] dynamic-link: x86: PTWRITE feature check is missing
468 [27389] network: NSS chroot hardening causes regressions in chroot
470 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
471 [27444] libc: sysconf reports unsupported option (-1) for
472 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
473 [27462] nscd: double-free in nscd (CVE-2021-27645)
474 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
475 malloc/tst-malloc-thread-fail
476 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
477 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
479 [27522] glob: glob, glob64 incorrectly marked as __THROW
480 [27555] dynamic-link: Static tests fail with --enable-stack-
482 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
483 information for the current directory
484 [27577] dynamic-link: elf/ld.so --help doesn't work
485 [27605] libc: tunables can't control xsave/xsavec selection in
487 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
488 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
490 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
491 _nss_files_getcanonname_r) from within a dlmopen namespace.
492 [27648] libc: FAIL: misc/tst-select
493 [27650] stdio: vfscanf returns too early if a match is longer than
495 [27651] libc: Performance regression after updating to 2.33
496 [27655] string: Wrong size calculation in string/test-strnlen.c
497 [27706] libc: select fails to update timeout on error
498 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
499 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
500 tries resolving them lazily
501 [27744] nptl: Support different libpthread/ld.so load orders in
503 [27749] libc: Data race __run_exit_handlers
504 [27761] libc: getconf: Segmentation fault when passing '-vq' as
506 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
507 exceeds maximum object size 2147483647
508 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
510 [27872] build: Obsolete configure option --enable-stackguard-
512 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
513 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
514 [27892] libc: powerpc: scv ABI error handling fails to check
516 [27896] nptl: mq_notify does not handle separately allocated thread
517 attributes (CVE-2021-33574)
518 [27901] libc: TEST_STACK_ALIGN doesn't work
519 [27902] libc: The x86-64 clone wrapper fails to align child stack
520 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
521 [27939] libc: aarch64: clone does not align the stack
522 [27968] libc: s390x: clone does not align the stack
523 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
524 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
526 [28028] malloc: malloc: tcache shutdown sequence does not work if the
527 thread never allocated anything
528 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
529 [28064] string: x86_64:wcslen implementation list has wcsnlen
530 [28067] libc: FAIL: posix/tst-spawn5
531 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
532 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
534 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
535 [28089] build: tst-tls20 fails when linker defaults to --as-needed
536 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
538 [28091] network: ns_name_skip may return 0 for domain names without
546 * The dynamic linker accepts the --list-tunables argument which prints
547 all the supported tunables. This option is disable if glibc is
548 configured with tunables disabled (--enable-tunables=no).
550 * The dynamic linker accepts the --argv0 argument and provides opportunity
551 to change argv[0] string.
553 * The dynamic linker loads optimized implementations of shared objects
554 from subdirectories under the glibc-hwcaps directory on the library
555 search path if the system's capabilities meet the requirements for
556 that subdirectory. Initially supported subdirectories include
557 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
558 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
559 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
560 subdirectory names correspond to the vendor-independent x86-64
561 microarchitecture levels defined in the x86-64 psABI supplement.
563 * The new --help option of the dynamic linker provides usage and
564 information and library search path diagnostics.
566 * The mallinfo2 function is added to report statistics as per mallinfo,
567 but with larger field widths to accurately report values that are
568 larger than fit in an integer.
570 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
572 * Support for the RISC-V ISA running on Linux has been expanded to run on
573 32-bit hardware. This is supported for the following ISA and ABI pairs:
579 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
582 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
583 glibc may use additional checks that may have an additional performance
584 overhead. At present these checks are available only on LLVM 9 and later.
585 The latest GCC available at this time (10.2) does not support this level of
588 Deprecated and removed features, and other changes affecting compatibility:
590 * The mallinfo function is marked deprecated. Callers should call
593 * When dlopen is used in statically linked programs, alternative library
594 implementations from HWCAP subdirectories are no longer loaded.
595 Instead, the default implementation is used.
597 * The deprecated <sys/vtimes.h> header and the function vtimes have been
598 removed. To support old binaries, the vtimes function continues to exist
599 as a compatibility symbol. Applications should use the getrlimit or
602 * Following a change in the tzdata 2018a release upstream, the zdump
603 program is now installed in the /usr/bin subdirectory. Previously,
604 the /usr/sbin subdirectory was used.
606 * On s390(x), the type float_t is now derived from the macro
607 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
608 hardcoded to double. This does not affect the ABI of any libraries
609 that are part of the GNU C Library, but may affect the ABI of other
610 libraries that use this type in their interfaces. The new definition
611 improves consistency with compiler behavior in many scenarios.
613 * A future version of glibc will stop loading shared objects from the
614 "tls" subdirectories on the library search path, the subdirectory that
615 corresponds to the AT_PLATFORM system name, and also stop employing
616 the legacy AT_HWCAP search mechanism. Applications should switch to
617 the new glibc-hwcaps mechanism instead; if they do not do that, only
618 the baseline version (directly from the search path directory) will be
621 Changes to build and runtime requirements:
623 * On Linux, the system administrator needs to configure /dev/pts with
624 the intended access modes for pseudo-terminals. glibc no longer
625 attemps to adjust permissions of terminal devices. The previous glibc
626 defaults ("tty" group, user read/write and group write) already
627 corresponded to what most systems used, so that grantpt did not
628 perform any adjustments.
630 * On Linux, the posix_openpt and getpt functions no longer attempt to
631 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
632 (and pseudo-terminals are supported), a devpts file system is mounted
633 on /dev/pts. Current systems already meet these requirements.
635 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
637 Security related changes:
639 CVE-2021-3326: An assertion failure during conversion from the
640 ISO-20220-JP-3 character set using the iconv function has been fixed.
641 This assertion was triggered by certain valid inputs in which the
642 converted output contains a combined sequence of two wide characters
643 crossing a buffer boundary. Reported by Tavis Ormandy.
645 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
646 invoked with input containing redundant shift sequences in the IBM1364,
647 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
649 CVE-2020-29562: An assertion failure has been fixed in the iconv function
650 when invoked with UCS4 input containing an invalid character.
652 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
653 invoked with EUC-KR input containing invalid multibyte input sequences.
655 The following bugs are resolved with this release:
657 [10635] libc: realpath portability patches
658 [16124] dynamic-link: ld.so should allow to change argv[0]
659 [17924] malloc: 'free' should not set errno
660 [18683] libc: Linux faccessat implementation can incorrectly ignore
662 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
663 [23091] hurd: missing waitid support
664 [23249] libc: Epyc and other current AMD CPUs do not select the
665 "haswell" platform subdirectory
666 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
668 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
670 [24941] libc: Make grantpt usable after multi-threaded fork in more
672 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
673 [24973] locale: iconv encounters segmentation fault when converting
674 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
675 [25399] string: undefined reference to `__warn_memset_zero_len' when
676 changing gnuc version
677 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
679 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
681 [25971] libc: s390 bits/hwcap.h out of sync with kernel
682 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
683 [26100] libc: Race in syslog(3) with regards to tag printing.
684 [26124] libc: Export <cpu-features.h>
685 [26130] nscd: Inconsistent nscd cache during pruning
686 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
687 [26224] locale: iconv hangs when converting some invalid inputs from
688 several IBM character sets (CVE-2020-27618)
689 [26341] libc: realpath cyclically call __alloca(path_max) to consume
691 [26343] manual: invalid documented return type for strerrorname_np(),
692 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
693 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
695 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
697 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
698 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
700 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
701 [26553] libc: mtx_init allows type set to "mtx_recursive" only
702 [26555] string: strerrorname_np does not return the documented value
703 [26592] libc: pointer arithmetic overflows in realpath
704 [26600] network: Transaction ID collisions cause slow DNS lookups in
706 [26606] libc: [2.33 Regression] pselect is broken on x32
707 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
708 [26620] glob: fnmatch with collating symbols results in segmentation
710 [26625] libc: [2.33 Regression] CET is disabled
711 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
712 at the end of a memory mapping
713 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
714 by the caller to the kernel
715 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
716 [26647] build: [-Werror=array-parameter=] due to different
717 declarations for __sigsetjmp
718 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
720 [26649] stdio: printf should handle non-normal x86 long double numbers
721 gracefully (CVE-2020-29573)
722 [26686] build: -Warray-parameter instances building with GCC 11
723 [26687] build: -Warray-bounds instances building with GCC 11
724 [26690] stdio: Aliasing violation in __vfscanf_internal
725 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
726 [26726] build: GCC warning calling new_composite_name with an array of
728 [26736] libc: FAIL: misc/tst-sysvshm-linux
729 [26737] libc: Random FAIL: rt/tst-shm
730 [26791] libc: Missing O_CLOEXEC in sysconf.c
731 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
733 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
735 [26818] string: aarch64: string tests may run ifunc variants that are
737 [26821] libc: Memory leak test failures on Fedora 33
738 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
739 FSGSBASE/LM/RDRAND check failure
740 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
742 [26853] libc: aarch64: Missing unwind information in statically linked
744 [26923] locale: Assertion failure in iconv when converting invalid
745 UCS4 (CVE-2020-29562)
746 [26926] dynamic-link: aarch64: library dependencies are not bti
748 [26932] libc: sh: Multiple floating point functions defined as stubs
750 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
752 [26988] dynamic-link: aarch64: BTI mprotect address is not page
754 [27002] build: libc_freeres_fn build failure with GCC 11
755 [27004] dynamic-link: ld.so is miscompiled by GCC 11
756 [27008] dynamic-link: ld.so.cache should have endianness markup
757 [27042] libc: [alpha] anonymous union in struct stat confuses
759 [27053] libc: Conformance regression in system(3) (and probably also
761 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
763 [27077] network: Do not reload /etc/nsswitch.conf from chroot
764 [27083] libc: Unsafe unbounded alloca in addmntent
765 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
767 [27130] string: "rep movsb" performance issue
768 [27150] libc: alpha: wait4() is unavailable in static linking
769 [27177] dynamic-link:
770 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
772 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
773 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
774 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
775 related to combining characters (CVE-2021-3326)
782 * Unicode 13.0.0 Support: Character encoding, character type info, and
783 transliteration tables are all updated to Unicode 13.0.0, using
784 generator scripts contributed by Mike FABIAN (Red Hat).
786 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
788 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
789 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
790 Three ABIs are supported:
796 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
797 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
799 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
800 DT_DEPAUDIT dynamic section entries of the main executable.
802 * powerpc64le supports IEEE128 long double libm/libc redirects when
803 using -mabi=ieeelongdouble to compile C code on supported GCC
804 toolchains. It is recommended to use GCC 8 or newer when testing
807 * To help detect buffer overflows and other out-of-bounds accesses
808 several APIs have been annotated with GCC 'access' attribute. This
809 should help GCC 10 issue better warnings.
811 * On Linux, functions pthread_attr_setsigmask_np and
812 pthread_attr_getsigmask_np have been added. They allow applications
813 to specify the signal mask of a thread created with pthread_create.
815 * The GNU C Library now provides the header file <sys/single_threaded.h>
816 which declares the variable __libc_single_threaded. Applications are
817 encouraged to use this variable for single-thread optimizations,
818 instead of weak references to symbols historically defined in
821 * The functions sigabbrev_np and sigdescr_np have been added. The
822 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
823 SIGHUP) while sigdescr_np returns a string describing the signal number
824 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
825 attempt to translate the return description, both functions return
826 NULL for an invalid signal number.
828 They should be used instead of sys_siglist or sys_sigabbrev and they
829 are both thread and async-signal safe. These functions are GNU extensions.
831 * The functions strerrorname_np and strerrordesc_np have been added. The
832 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
833 while strerrordesc_np returns a string describing the error number
834 (e.g "Invalid argument" for EINVAL). Different than strerror,
835 strerrordesc_np does not attempt to translate the return description, both
836 functions return NULL for an invalid error number.
838 They should be used instead of sys_errlist and sys_nerr, both are
839 thread and async-signal safe. These functions are GNU extensions.
841 * AArch64 now supports standard branch protection security hardening
842 in glibc when it is built with a GCC that is configured with
843 --enable-standard-branch-protection (or if -mbranch-protection=standard
844 flag is passed when building both GCC target libraries and glibc,
845 in either case a custom GCC is needed). This includes branch target
846 identification (BTI) and pointer authentication for return addresses
847 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
848 extensions respectively for the protection to be effective,
849 otherwise the used instructions are nops. User code can use PAC-RET
850 without libc support, but BTI requires a libc that is built with BTI
851 support, otherwise runtime objects linked into user code will not be
854 Deprecated and removed features, and other changes affecting compatibility:
856 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
857 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
858 RPC header files. Backward compatibility for old programs is kept
859 only for architectures and ABIs that have been added in or before
860 glibc 2.31. New programs need to use TI-RPC
861 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
862 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
864 * Remove configure option --enable-obsolete-nsl. libnsl is only built
865 as shared library for backward compatibility and the NSS modules "nis"
866 and "nisplus" are not built at all and libnsl's headers aren't
867 installed. This compatibility is kept only for architectures and ABIs
868 that have been added in or before version 2.28. Replacement
869 implementations based on TI-RPC, which additionally support IPv6, are
870 available from <https://github.com/thkukuk/>. This change does not
871 affect the "compat" NSS module, which does not depend on libnsl
872 since 2.27 and thus can be used without NIS.
874 * The deprecated <sys/sysctl.h> header and the sysctl function have been
875 removed. To support old binaries, the sysctl function continues to
876 exist as a compatibility symbol (on those architectures which had it),
877 but always fails with ENOSYS. This reflects the removal of the system
878 call from all architectures, starting with Linux 5.5.
880 * The sstk function is no longer available to newly linked binaries.
881 Its implementation always returned with a failure, and the function
882 was not declared in any header file.
884 * The legacy signal handling functions siginterrupt, sigpause, sighold,
885 sigrelse, sigignore and sigset, and the sigmask macro have been
886 deprecated. Applications should use the sigsuspend, sigprocmask and
887 sigaction functions instead.
889 * ldconfig now defaults to the new format for ld.so.cache. glibc has
890 already supported this format for almost 20 years.
892 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
893 are no longer available to newly linked binaries, and their declarations
894 have been removed from <string.h>. They are exported solely as
895 compatibility symbols to support old binaries. All programs should use
898 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
899 are no longer available to newly linked binaries, and their declarations
900 have been removed from <stdio.h>. They are exported solely as
901 compatibility symbols to support old binaries. All programs should use
902 strerror or strerror_r instead.
904 * Both strerror and strerror_l now share the same internal buffer in the
905 calling thread, meaning that the returned string pointer may be invalided
906 or contents might be overwritten on subsequent calls in the same thread or
907 if the thread is terminated. It makes strerror MT-safe.
909 * Using weak references to libpthread functions such as pthread_create
910 or pthread_key_create to detect the singled-threaded nature of a
911 program is an obsolescent feature. Future versions of glibc will
912 define pthread_create within libc.so.6 itself, so such checks will
913 always flag the program as multi-threaded. Applications should check
914 the __libc_single_threaded variable declared in
915 <sys/single_threaded.h> instead.
917 * The "files" NSS module no longer supports the "key" database (used for
918 secure RPC). The contents of the /etc/publickey file will be ignored,
919 regardless of the settings in /etc/nsswitch.conf. (This method of
920 storing RPC keys only supported the obsolete and insecure AUTH_DES
921 flavor of secure RPC.)
923 * The __morecore and __after_morecore_hook malloc hooks and the default
924 implementation __default_morecore have been deprecated. Applications
925 should use malloc interposition to change malloc behavior, and mmap to
926 allocate anonymous memory. A future version of glibc may require that
927 applications which use the malloc hooks must preload a special shared
928 object, to enable the hooks.
930 * The hesiod NSS module has been deprecated and will be removed in a
931 future version of glibc. System administrators are encouraged to
932 switch to other approaches for networked account databases, such as
935 Changes to build and runtime requirements:
937 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
938 long double redirects.
940 Security related changes:
942 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
943 invoked with the -c option and when processing invalid multi-byte input
944 sequences. Reported by Jan Engelhardt.
946 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
947 corruption when they were passed a pseudo-zero argument. Reported by Guido
948 Vranken / ForAllSecure Mayhem.
950 CVE-2020-1752: A use-after-free vulnerability in the glob function when
951 expanding ~user has been fixed.
953 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
954 memmove functions has been fixed. Discovered by Jason Royes and Samual
955 Dytrych of the Cisco Security Assessment and Penetration Team (See
958 The following bugs are resolved with this release:
960 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
961 [10441] manual: Backtraces code example lacks error checking
962 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
963 timer_sigev_thread dangerous
964 [14231] stdio: stdio-common tests memory requirements
965 [14578] libc: /proc-based emulation for lchmod, fchmodat
966 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
967 filtee has constructor
968 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
969 sequences (CVE-2016-10228)
970 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
971 character entities for infinity & pi
972 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
973 segfaults in applications
974 [20543] libc: Please move from .gnu.linkonce to comdat
975 [22489] network: gcc warns about implicit convertion in
976 ICMP6_FILTER_SETPASS with -Wsign-conversion
977 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
978 [23294] math: Complex _FloatN functions are redirected to the wrong
979 function with -mlong-double-64
980 [23296] libc: Data race in setting function descriptor during lazy
982 [23668] dynamic-link: ldconfig: Default to the new format for
984 [23819] hurd: hurd: Add C11 thread support
985 [23990] build: test-container error out on failure to exec child.
986 [23991] build: shell-container typo in run_command_array
987 [24638] manual: Error in example of parsing a template string
988 [24654] manual: Wrong declaration of wcschr in libc manual
989 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
991 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
992 dynamically loaded dsos
993 [25098] nptl: nptl: ctype classification functions are not AS-Safe
994 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
996 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
997 restore EAX, ECX and EDX
998 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
999 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1000 [25420] network: Race condition in resolv_conf.c can result in caching
1001 stale configuration forever
1002 [25487] math: sinl() stack corruption from crafted input
1004 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1006 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1007 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1009 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1010 on 32 bit and old kernel
1011 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1012 [25639] localedata: Some names of days and months wrongly spelt in
1014 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1015 amount of sigset_t bytes
1016 [25691] stdio: printf: memory leak when printing long multibyte
1018 [25715] libc: system() returns wrong errors when posix_spawn fails
1019 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1020 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1021 state for conversions that produce two Unicode code points
1022 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1023 for linux x86_64 leads to livelock
1024 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1025 test failures, invalid instruction in ld.so
1026 [25790] glob: Typo in tst-fnmatch.input
1027 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1029 [25819] localedata: Update locale data to Unicode 13.0.0
1030 [25824] libc: Abnormal function of strnlen in aarch64
1031 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1032 [25896] libc: Incorrect prctl
1033 [25902] libc: Bad LOADARGS_N
1034 [25905] dynamic-link: VSX registers are corrupted during PLT
1035 resolution when glibc is built with --disable-multi-arch and --with-
1037 [25933] string: Off by one error in __strncmp_avx2 when
1038 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1040 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1041 exiting detached thread
1042 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1044 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1046 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1047 [26073] math: getpayload() has wrong return value
1048 [26076] dynamic-link: dlmopen crashes after failing to load
1049 dependencies in audit mode
1050 [26120] localedata: column width of of some Korean
1051 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1052 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1053 [26133] libc: Incorrect need_arch_feature_F16C
1054 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1056 [26149] libc: PKU is usable only if OSPKE is set
1057 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1059 [26208] libc: Incorrect bit_cpu_CLFSH
1060 [26210] network: Incorrect use of hidden symbols for global sunrpc
1062 [26211] stdio: printf integer overflow calculating allocation size
1063 [26214] stdio: printf_fp double free
1064 [26215] stdio: printf_fp memory leak
1065 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1066 [26258] nss: nss_compat should not read input files with mmap
1067 [26332] string: Incorrect cache line size load causes memory
1068 corruption in memset
1075 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1076 enable features from the draft ISO C2X standard. Only some features from
1077 this draft standard are supported by the GNU C Library, and as the draft
1078 is under active development, the set of features enabled by this macro is
1079 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1080 by compiling with "gcc -std=gnu2x".
1082 * The <math.h> functions that round their results to a narrower type now
1083 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1084 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1085 Clarification Request 13 to TS 18661-3.
1087 * The function pthread_clockjoin_np has been added, enabling join with a
1088 terminated thread with a specific clock. It allows waiting against
1089 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1091 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1093 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1094 in queries if the trust-ad option is set via the options directive in
1095 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1096 mode, the AD bit, as provided by the name server, is available to
1097 applications which call res_search and related functions. In the default
1098 mode, the AD bit is not set in queries, and it is automatically cleared in
1099 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1100 servers and the network path to them are treated as untrusted.)
1102 Deprecated and removed features, and other changes affecting compatibility:
1104 * The totalorder and totalordermag functions, and the corresponding
1105 functions for other floating-point types, now take pointer arguments to
1106 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1107 passing. This is in accordance with the resolution of Clarification
1108 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1109 floating-point arguments directly will continue to work.
1111 * The obsolete function stime is no longer available to newly linked
1112 binaries, and its declaration has been removed from <time.h>.
1113 Programs that set the system time should use clock_settime instead.
1115 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1116 in a future version of glibc. In this release, the header still exists
1117 but calling ftime will cause a compiler warning. All programs should use
1118 gettimeofday or clock_gettime instead.
1120 * The gettimeofday function no longer reports information about a
1121 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1122 many years, as it cannot handle the full complexity of the world's
1123 timezones, but hitherto we have supported it on a best-effort basis.
1124 Changes required to support 64-bit time_t on 32-bit architectures have
1125 made this no longer practical.
1127 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1128 should expect to receive a 'struct timezone' whose tz_minuteswest and
1129 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1130 happen on a few Linux-based ports. This will be corrected in a future
1133 All callers should supply a null pointer for the 'tzp' argument to
1134 gettimeofday. For accurate information about the time zone associated
1135 with the current time, use the localtime function.
1137 gettimeofday itself is obsolescent according to POSIX. We have no plans
1138 to remove access to this function, but portable programs should consider
1139 using clock_gettime instead.
1141 * The settimeofday function can still be used to set a system-wide time
1142 zone when the operating system supports it. This is because the Linux
1143 kernel reused the API, on some architectures, to describe a system-wide
1144 time-zone-like offset between the software clock maintained by the kernel,
1145 and the "RTC" clock that keeps time when the system is shut down.
1147 However, to reduce the odds of this offset being set by accident,
1148 settimeofday can no longer be used to set the time and the offset
1149 simultaneously. If both of its two arguments are non-null, the call
1150 will fail (setting errno to EINVAL).
1152 Callers attempting to set this offset should also be prepared for the call
1153 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1154 some Linux architectures. The Linux kernel maintainers are discussing a
1155 more principled replacement for the reused API. After a replacement
1156 becomes available, we will change settimeofday to fail with ENOSYS on all
1157 platforms when its 'tzp' argument is not a null pointer.
1159 settimeofday itself is obsolescent according to POSIX. Programs that set
1160 the system time should use clock_settime and/or the adjtime family of
1161 functions instead. We may cease to make settimeofday available to newly
1162 linked binaries after there is a replacement for Linux's time-zone-like
1165 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1166 the optional CAS instruction is implemented (for instance, LEON processors
1167 are still supported, but SuperSPARC processors are not).
1169 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1172 * If a lazy binding failure happens during dlopen, during the execution of
1173 an ELF constructor, the process is now terminated. Previously, the
1174 dynamic loader would return NULL from dlopen, with the lazy binding error
1175 captured in a dlerror message. In general, this is unsafe because
1176 resetting the stack in an arbitrary function call is not possible.
1178 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1179 executable stack unless explicitly configured at build time to require
1180 minimum kernel version 4.8 or newer. This is because executing
1181 floating-point branches on a non-executable stack on Linux kernels prior to
1182 4.8 can lead to application crashes for some MIPS configurations. While
1183 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1184 expected to enable non-executable stack by default with PT_GNU_STACK by
1185 default and is thus likely to trigger a crash on older kernels.
1187 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1188 non-executable stack while dropping support for older kernels.
1190 * System call wrappers for time system calls now use the new time64 system
1191 calls when available. On 32-bit targets, these wrappers attempt to call
1192 the new system calls first and fall back to the older 32-bit time system
1193 calls if they are not present. This may cause issues in environments
1194 that cannot handle unsupported system calls gracefully by returning
1195 -ENOSYS. Seccomp sandboxes are affected by this issue.
1197 Changes to build and runtime requirements:
1199 * It is no longer necessary to have recent Linux kernel headers to build
1200 working (non-stub) system call wrappers on all architectures except 64-bit
1201 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1203 * The ChangeLog file is no longer present in the toplevel directory of the
1204 source tree. ChangeLog files are located in the ChangeLog.old directory as
1205 ChangeLog.N where the highest N has the latest entries.
1207 Security related changes:
1209 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1210 out-of-bounds write when executed in a signal frame context.
1212 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1213 environment variable during program execution after a security
1214 transition, allowing local attackers to restrict the possible mapping
1215 addresses for loaded libraries and thus bypass ASLR for a setuid
1216 program. Reported by Marcin Kościelnicki.
1218 The following bugs are resolved with this release:
1220 [12031] localedata: iconv -t ascii//translit with Greek characters
1221 [15813] libc: Multiple issues in __gen_tempname
1222 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1223 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1224 [19767] libc: vdso is not used with static linking
1225 [19903] hurd: Shared mappings not being inherited by children processes
1226 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1227 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1229 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1230 Symbols-A/B Unicode blocks
1231 [23518] libc: Eliminate __libc_utmp_jump_table
1232 [24026] malloc: malloc_info() returns wrong numbers
1233 [24054] localedata: Many locales are missing date_fmt
1234 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1235 [24304] dynamic-link: Lazy binding failure during ELF
1236 constructors/destructors is not fatal
1237 [24376] libc: RISC-V symbol size confusion with _start
1238 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1240 [24824] libc: test-in-container does not install charmap files compatible
1242 [24844] regex: regex bad pointer / leakage if malloc fails
1243 [24867] malloc: Unintended malloc_info formatting changes
1244 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1245 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1246 [24882] libc: login: pututline uses potentially outdated cache
1247 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1248 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1250 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1252 [24930] dynamic-link: dlopen of PIE executable can result in
1253 _dl_allocate_tls_init assertion failure
1254 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1255 (stringop-overflow error)
1256 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1257 functions other can lead to crashes
1258 [24967] libc: jemalloc static linking causes runtime failure
1259 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1261 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1262 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1263 [25097] libc: new -Warray-bounds with GCC 10
1264 [25112] dynamic-link: dlopen must not make new objects accessible when it
1265 still can fail with an error
1266 [25139] localedata: Please add the new mnw_MM locale
1267 [25149] regex: Array bounds violation in proceed_next_node
1268 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1269 initialized correctly
1270 [25189] libc: glibc's __glibc_has_include causes issues with clang
1272 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1273 value to an unsigned
1274 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1275 binaries (CVE-2019-19126)
1276 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1278 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1280 [25232] string: <string.h> does not enable const correctness for strchr et
1282 [25233] localedata: Consider "." as the thousands separator for sl_SI
1284 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1285 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1286 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1288 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1289 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1291 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1292 (dl_initfirst) link map pointer
1293 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1294 [25423] libc: Array overflow in backtrace on powerpc
1295 [25425] network: Missing call to __resolv_context_put in
1296 getaddrinfo.c:gethosts
1303 * Unicode 12.1.0 Support: Character encoding, character type info, and
1304 transliteration tables are all updated to Unicode 12.1.0, using
1305 generator scripts contributed by Mike FABIAN (Red Hat).
1307 * The dynamic linker accepts the --preload argument to preload shared
1308 objects, in addition to the LD_PRELOAD environment variable.
1310 * The twalk_r function has been added. It is similar to the existing
1311 twalk function, but it passes an additional caller-supplied argument
1312 to the callback function.
1314 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1316 * Minguo (Republic of China) calendar support has been added as an
1317 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1320 * The entry for the new Japanese era has been added for ja_JP locale.
1322 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1323 pvalloc, memalign, and posix_memalign fail now with total object size
1324 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1325 pointer subtraction within the allocated object, where results might
1326 overflow the ptrdiff_t type.
1328 * The dynamic linker no longer refuses to load objects which reference
1329 versioned symbols whose implementation has moved to a different soname
1330 since the object has been linked. The old error message, symbol
1331 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1332 link time reference, is gone.
1334 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1335 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1336 functions. These behave similarly to their "timed" equivalents, but also
1337 accept a clockid_t parameter to determine which clock their timeout should
1338 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1339 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1340 time of the wait (unlike with pthread_condattr_setclock, which requires
1341 the clock choice at initialization time).
1343 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1344 work, new resolvers can use a second argument which can be extended in
1345 the future, currently it contains the AT_HWCAP2 value.
1347 Deprecated and removed features, and other changes affecting compatibility:
1349 * The copy_file_range function fails with ENOSYS if the kernel does not
1350 support the system call of the same name. Previously, user space
1351 emulation was performed, but its behavior did not match the kernel
1352 behavior, which was deemed too confusing. Applications which use the
1353 copy_file_range function can no longer rely on glibc to provide a fallback
1354 on kernels that do not support the copy_file_range system call, and if
1355 this function returns ENOSYS, they will need to use their own fallback.
1356 Support for copy_file_range for most architectures was added in version
1357 4.5 of the mainline Linux kernel.
1359 * The functions clock_gettime, clock_getres, clock_settime,
1360 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1361 for new applications (on architectures which had them). Instead, the
1362 definitions in libc will be used automatically, which have been available
1365 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1366 and <sys/stropts.h> have been removed.
1368 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1369 resolver flag (deprecated in glibc 2.25) have been removed.
1371 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1372 resolver have been removed from <resolv.h>.
1374 * With --enable-bind-now, installed programs are now linked with the
1377 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1378 configurations) has been removed, following the deprecation of this
1379 subarchitecture in version 8 of GCC, and its removal in version 9.
1381 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1382 header have been removed.
1384 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1385 deprecated and will be removed from a future version of glibc.
1386 Application should directly access /proc instead. For obtaining random
1387 bits, the getentropy function can be used.
1389 Changes to build and runtime requirements:
1391 * GCC 6.2 or later is required to build the GNU C Library.
1393 Older GCC versions and non-GNU compilers are still supported when
1394 compiling programs that use the GNU C Library.
1396 Security related changes:
1398 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1399 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1400 has undefined behavior. On x32, the size_t argument may be passed
1401 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1402 32 bits. When it happened with the sign bit of RDX register set,
1403 memcmp gave the wrong result since it treated the size argument as
1404 zero. Reported by H.J. Lu.
1406 CVE-2019-9169: Attempted case-insensitive regular-expression match
1407 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1408 over-read. Reported by Hongxu Chen.
1410 The following bugs are resolved with this release:
1412 [2872] locale: Transliteration Cyrillic -> ASCII fails
1413 [6399] libc: gettid() should have a wrapper
1414 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1415 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1416 [17396] localedata: globbing for locale by [[.collating-element.]]
1417 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1418 [18465] malloc: memusagestat is built using system C library
1419 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1420 invalid input drops valid char
1421 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1422 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1423 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1424 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1425 [23352] malloc: __malloc_check_init still defined in public header
1427 [23403] nptl: Wrong alignment of TLS variables
1428 [23501] libc: nftw() doesn't return dangling symlink's inode
1429 [23733] malloc: Check the count before calling tcache_get()
1430 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1432 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1433 [23844] nptl: pthread_rwlock_trywrlock results in hang
1434 [23983] argparse: Missing compat versions of argp_failure and argp_error
1435 for long double = double
1436 [23984] libc: Missing compat versions of err.h and error.h functions for
1437 long double = double
1438 [23996] localedata: Dutch salutations
1439 [24040] libc: riscv64: unterminated call chain in __thread_start
1440 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1442 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1443 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1445 [24114] regex: regexec buffer read overrun in "grep -i
1446 '\(\(\)*.\)*\(\)\(\)\1'"
1447 [24122] libc: Segfaults if 0 returned from la_version
1448 [24153] stdio: Some input functions do not react to stdin assignment
1449 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1450 RDX is set) (CVE-2019-7309)
1451 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1452 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1453 not the default "nor"
1454 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1455 false positives, change to modern flexible array
1456 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1457 instructions while maintaining the robust mutex list due to missing
1459 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1460 unnecessary librt dependencies
1461 [24200] localedata: Revert first_weekday removal in en_IE locale
1462 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1463 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1464 [24216] malloc: Check for large bin list corruption when inserting
1466 [24228] stdio: old x86 applications that use legacy libio crash on exit
1467 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1469 [24293] localedata: Missing Minguo calendar support for TW locales
1470 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1471 tt_RU (Tatar) locale
1472 [24307] localedata: Update locale data to Unicode 12.0.0
1473 [24323] dynamic-link: dlopen should not be able open PIE objects
1474 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1475 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1476 tt_RU (Tatar) locale
1477 [24370] localedata: Add lang_name for tt_RU locale
1478 [24372] locale: Binary locale files are not architecture independent
1479 [24394] time: strptime %Ey mis-parses final year of era
1480 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1482 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1484 [24531] malloc: Malloc tunables give tcache assertion failures
1485 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1487 [24535] localedata: Update locale data to Unicode 12.1.0
1488 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1489 kernels and break testing
1490 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1491 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1492 [-Werror=format-overflow=]
1493 [24570] libc: alpha: compat msgctl uses __IPC_64
1494 [24584] locale: Data race in __wcsmbs_clone_conv
1495 [24588] stdio: Remove codecvt vtables from libio
1496 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1498 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1499 [24632] stdio: Old binaries which use freopen with default stdio handles
1501 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1503 [24652] localedata: szl_PL spelling correction
1504 [24695] nss: nss_db: calling getpwent after endpwent crashes
1505 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1506 in /etc/nsswitch.conf
1507 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1508 [24740] libc: getdents64 type confusion
1509 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1510 always implemented in the same library
1511 [24744] libc: Remove copy_file_range emulation
1512 [24757] malloc: memusagestat is linked against system libpthread
1513 [24794] libc: Partial test suite run builds corrupt test-in-container
1521 * The getcpu wrapper function has been added, which returns the currently
1522 used CPU and NUMA node. This function is Linux-specific.
1524 * A new convenience target has been added for distribution maintainers
1525 to build and install all locales as directories with files. The new
1526 target is run by issuing the following command in your build tree:
1527 'make localedata/install-locale-files', with an optional DESTDIR
1528 to set the install root if you wish to install into a non-default
1529 configured location.
1531 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1533 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1534 for _GNU_SOURCE, to match BSD environments.
1536 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1537 indicates that it will abort the transaction prior to entering the kernel
1538 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1539 suspended, and this caused some undefined side-effects issues by aborting
1540 transactions manually. Glibc avoided it by abort transactions manually on
1541 each syscall, but it lead to performance issues on newer kernels where the
1542 HTM state is saved and restore lazily (the state being saved even when the
1543 process actually does not use HTM).
1545 * The functions posix_spawn_file_actions_addchdir_np and
1546 posix_spawn_file_actions_addfchdir_np have been added, enabling
1547 posix_spawn and posix_spawnp to run the new process in a different
1548 directory. These functions are GNU extensions. The function
1549 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1552 * The popen and system do not run atfork handlers anymore (BZ#17490).
1553 Although it is a possible POSIX violation, the POSIX rationale in
1554 pthread_atfork documentation regarding atfork handlers is to handle
1555 inconsistent mutex state after a fork call in a multi-threaded process.
1556 In both popen and system there is no direct access to user-defined mutexes.
1558 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1559 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1561 - C-SKY ABIV2 soft-float little-endian
1562 - C-SKY ABIV2 hard-float little-endian
1564 * strftime's default formatting of a locale's alternative year (%Ey)
1565 has been changed to zero-pad the year to a minimum of two digits,
1566 like "%y". This improves the display of Japanese era years during
1567 the first nine years of a new era, and is expected to be harmless
1568 for all other locales (only Japanese locales regularly have
1569 alternative year numbers less than 10). Zero-padding can be
1570 overridden with the '_' or '-' flags (which are GNU extensions).
1572 * As a GNU extension, the '_' and '-' flags can now be applied to
1573 "%EY" to control how the year number is formatted; they have the
1574 same effect that they would on "%Ey".
1576 Deprecated and removed features, and other changes affecting compatibility:
1578 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1579 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1581 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1582 in <sys/procfs.h>, has been corrected to match the type actually used by
1583 the Linux kernel. This affects the size and layout of that structure on
1584 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1586 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1587 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1588 defined in <sys/procfs.h>, has been corrected to match the type actually
1589 used by the Linux kernel. This affects the size and layout of those
1592 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1593 meant to scan a string and allocate space for it with malloc, is now
1594 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1595 defined. This extension conflicts with C99's use of '%a' to scan a
1596 hexadecimal floating-point number, which is now available to programs
1597 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1599 POSIX.1-2008 includes the feature of allocating a buffer for string input
1600 with malloc, using the modifier letter 'm' instead. Programs using
1601 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1602 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1603 C99 '%a' no longer need to avoid _GNU_SOURCE.
1605 GCC's -Wformat warnings can detect most uses of this extension, as long
1606 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1607 __attribute__ ((format (scanf, ...))).
1609 Changes to build and runtime requirements:
1611 * Python 3.4 or later is required to build the GNU C Library.
1613 * On most architectures, GCC 5 or later is required to build the GNU C
1614 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1616 Older GCC versions and non-GNU compilers are still supported when
1617 compiling programs that use the GNU C Library.
1619 Security related changes:
1621 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1622 denial of service due to resource exhaustion when processing getaddrinfo
1623 calls with crafted host names. Reported by Guido Vranken.
1625 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1626 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1627 happened, accessing the 32-bit size_t value as the full 64-bit register
1628 in the assembly string/memory functions would cause a buffer overflow.
1629 Reported by H.J. Lu.
1631 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1632 addresses with arbitrary trailing characters, potentially leading to data
1633 or command injection issues in applications.
1635 The following bugs are resolved with this release:
1637 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1638 [10496] localedata: 12h time representation in multiple locales faulty
1639 [10797] localedata: it_IT locale numeric does not have a separator for
1641 [11319] libc: dprintf doesn't handle errors properly
1642 [16346] time: mktime: potentially unsafe use of localtime_offset
1643 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1645 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1646 posix_spawn_file_actions_addfchdir_np
1647 [17426] localedata: Indian locales: set the correct date format
1648 [17490] stdio: popen should not invoke atfork handlers
1649 [17783] libc: TIOCSER_TEMT conditions inconsistent
1650 [18040] regex: use-after-free in regexec/get_subexp
1651 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1652 [20018] network: getaddrinfo should reject IP addresses with trailing
1653 characters (CVE-2016-10739)
1654 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1655 [20271] libc: Missing "\n" in __libc_fatal calls
1656 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1657 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1658 pointer argument is non-NULL
1659 [21037] stdio: open_memstream and freopen
1660 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1661 [21716] time: Crash in glibc's mktime in low-memory situations
1662 [22834] stdio: Subprocess forked by popen may crash in Linux when
1663 multithreads call popen
1664 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1665 and pthread_create fails.
1666 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1667 [23125] libc: riscv64: endless loop when throwing an exception from a
1669 [23275] nptl: Race in pthread_mutex_lock while promoting to
1670 PTHREAD_MUTEX_ELISION_NP.
1671 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1673 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1675 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1677 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1678 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1680 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1681 [23521] nss: get_next_alias nss_files file stream leak
1682 [23538] nptl: Hang in pthread_cond_broadcast
1683 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1684 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1685 [23579] libc: Errors misreported in preadv2
1686 [23597] build: support/test-container.c doesn't work with different
1688 [23603] time: mktime signed integer overflow on large timestamps
1689 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1690 [23614] libc: powerpc: missing CFI register information in __mpn_*
1692 [23637] string: Generic strstr/strcasestr fails with huge needles
1693 [23640] libc: no way to easily clear FD_CLOEXEC in
1694 posix_spawn_file_actions_adddup2()
1695 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1697 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1699 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1700 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1701 bits/types/struct_rusage.h
1702 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1704 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1706 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1707 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1708 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1710 [23724] localedata: Albanian date formats are incorrect
1711 [23735] math: libnldbl_nonshared.a references internal libm symbols
1712 [23740] localedata: kl_GL: Month names and date formats need update
1713 [23744] regex: regex refactorings to remove BE, avoid duplication
1714 [23745] time: mktime fix for Gnulib + coreutils
1715 [23758] time: Improve the width of alternate representation for year in
1717 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1718 [23789] time: mktime does not set errno on failure
1719 [23791] localedata: Wrong monetary format for ca_ES locale
1720 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1721 [23794] locale: c16rtomb does not handle surrogate pairs
1722 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1723 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1724 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1725 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1726 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1727 [23862] libc: [sh] missing kernel-features.h undefines
1728 [23864] libc: [riscv] missing kernel-features.h undefines
1729 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1730 [23907] malloc: Incorrect double-free malloc tcache check disregards
1732 [23913] libc: off-by-one in function maybe_script_execute in
1733 sysdeps/posix/spawni.c
1734 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1735 [23923] locale: Add --no-hard-links option to localedef
1736 [23927] network: Linux if_nametoindex() does not close descriptor
1738 [23961] math: powf can overflow to inf without setting errno in non-
1739 nearest rounding mode
1740 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1741 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1742 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1743 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1744 [24011] localedata: Fixed small type in comment for locale bs_BA
1745 [24018] libc: gettext() may return NULL
1746 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1747 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1748 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1750 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1751 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1753 [24046] localedata: en_US locale doesn't define date_fmt
1754 [24063] manual: @var{errno} should be @code{errno}
1755 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1756 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1758 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1760 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1762 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1764 [24112] network: Do not send DNS queries for non-host names (where all
1765 answers will be rejected)
1766 [24130] libc: alpha __remqu corrupts $f3 register
1773 * The localization data for ISO 14651 is updated to match the 2016
1774 Edition 4 release of the standard, this matches data provided by
1775 Unicode 9.0.0. This update introduces significant improvements to the
1776 collation of Unicode characters. This release deviates slightly from
1777 the standard in that the collation element ordering for lowercase and
1778 uppercase LATIN script characters is adjusted to ensure that regular
1779 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1780 is not matched by [a-z]. With the update many locales have been
1781 updated to take advantage of the new collation information. The new
1782 collation information has increased the size of the compiled locale
1783 archive or binary locales.
1785 * The GNU C Library can now be compiled with support for Intel CET, AKA
1786 Intel Control-flow Enforcement Technology. When the library is built
1787 with --enable-cet, the resulting glibc is protected with indirect
1788 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1789 compatible with all existing executables and shared libraries. This
1790 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1791 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1792 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1793 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1794 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1795 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1798 * The GNU C Library now has correct support for ABSOLUTE symbols
1799 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1800 relocated incorrectly or in some cases discarded. The GNU linker can
1801 make use of the newer semantics, but it must communicate it to the
1802 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1803 field) to indicate such support is required.
1805 * Unicode 11.0.0 Support: Character encoding, character type info, and
1806 transliteration tables are all updated to Unicode 11.0.0, using
1807 generator scripts contributed by Mike FABIAN (Red Hat).
1809 * <math.h> functions that round their results to a narrower type are added
1810 from TS 18661-1:2014 and TS 18661-3:2015:
1812 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1813 fMxaddfNx functions.
1815 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1816 fMxsubfNx functions.
1818 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1819 fMxmulfNx functions.
1821 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1822 fMxdivfNx functions.
1824 * Two grammatical forms of month names are now supported for the following
1825 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1826 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1827 support two grammatical forms in abbreviated month names: Catalan, Greek,
1830 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1831 include the support for two grammatical forms of month names.
1833 * Building and running on GNU/Hurd systems now works without out-of-tree
1836 * The renameat2 function has been added, a variant of the renameat function
1837 which has a flags argument. If the flags are zero, the renameat2 function
1838 acts like renameat. If the flag is not zero and there is no kernel
1839 support for renameat2, the function will fail with an errno value of
1840 EINVAL. This is different from the existing gnulib function renameatu,
1841 which performs a plain rename operation in case of a RENAME_NOREPLACE
1842 flags and a non-existing destination (and therefore has a race condition
1843 that can clobber the destination inadvertently).
1845 * The statx function has been added, a variant of the fstatat64
1846 function with an additional flags argument. If there is no direct
1847 kernel support for statx, glibc provides basic stat support based on
1848 the fstatat64 function.
1850 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1851 library if installed. libidn2 version 2.0.5 or later is recommended. If
1852 libidn2 is not available, internationalized domain names are not encoded
1853 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1854 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1855 with an encoding error.) Flags which used to change the IDN encoding and
1856 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1857 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1858 deprecated. They no longer have any effect.
1860 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1861 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1862 range of ELF gABI expressions including such constructs as
1863 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1864 have been further restricted, and where in the past a dynamic string
1865 token sequence may have been interpreted as a literal string it will
1866 now cause a load failure. These load failures were always considered
1867 unspecified behaviour from the perspective of the dynamic loader, and
1868 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1869 results in a load failure now.
1871 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1872 implementation includes all the standard functions provided by
1875 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1876 thrd_detach, thrd_exit, and thrd_join for thread management.
1878 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1879 mtx_destroy for mutual exclusion.
1881 - call_once for function call synchronization.
1883 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1884 cnd_wait for conditional variables.
1886 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1888 Application developers must link against libpthread to use ISO C threads.
1890 Deprecated and removed features, and other changes affecting compatibility:
1892 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1893 installed. Software that was using either header should be updated to
1894 use standard <stdio.h> interfaces instead.
1896 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1897 This was never required by the C standard, and the macros just expanded
1898 to call alternative names for the same functions. If you hoped getc and
1899 putc would provide performance improvements over fgetc and fputc, instead
1900 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1901 necessary, flockfile and funlockfile.
1903 * All stdio functions now treat end-of-file as a sticky condition. If you
1904 read from a file until EOF, and then the file is enlarged by another
1905 process, you must call clearerr or another function with the same effect
1906 (e.g. fseek, rewind) before you can read the additional data. This
1907 corrects a longstanding C99 conformance bug. It is most likely to affect
1908 programs that use stdio to read interactive input from a terminal.
1911 * The macros 'major', 'minor', and 'makedev' are now only available from
1912 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1913 headers that happen to include <sys/types.h>. These macros are rarely
1914 used, not part of POSIX nor XSI, and their names frequently collide with
1915 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1916 further explanation.
1918 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1919 these macros should first include <sys/types.h>, and then include
1920 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1922 * The tilegx*-*-linux-gnu configurations are no longer supported.
1924 * The obsolete function ustat is no longer available to newly linked
1925 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1926 function has been deprecated in favor of fstatfs and statfs.
1928 * The obsolete function nfsservctl is no longer available to newly linked
1929 binaries. This function was specific to systems using the Linux kernel
1930 and could not usefully be used with the GNU C Library on systems with
1931 version 3.1 or later of the Linux kernel.
1933 * The obsolete function name llseek is no longer available to newly linked
1934 binaries. This function was specific to systems using the Linux kernel
1935 and was not declared in a header. Programs should use the lseek64 name
1936 for this function instead.
1938 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1939 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1940 previously selected by them is now always enabled.
1942 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1943 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1944 restriction (rejecting '_' in host names, among other things) has been
1945 removed, for increased compatibility with non-IDN name resolution.
1947 * The fcntl function now have a Long File Support variant named fcntl64. It
1948 is added to fix some Linux Open File Description (OFD) locks usage on non
1949 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1950 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1951 locks act as a cancellation entrypoint.
1953 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1954 ecb_crypt, and des_setparity are no longer available to newly linked
1955 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1956 longer installed. These functions encrypted and decrypted data with the
1957 DES block cipher, which is no longer considered secure. Software that
1958 still uses these functions should switch to a modern cryptography library,
1961 * Reflecting the removal of the encrypt and setkey functions above, the
1962 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1963 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1966 * The obsolete function fcrypt is no longer available to newly linked
1967 binaries. It was just another name for the standard function crypt,
1968 and it has not appeared in any header file in many years.
1970 * We have tentative plans to hand off maintenance of the passphrase-hashing
1971 library, libcrypt, to a separate development project that will, we hope,
1972 keep up better with new passphrase-hashing algorithms. We will continue
1973 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1974 'crypt_r' should not need to change at all; however, distributions will
1975 need to install <crypt.h> and libcrypt from a separate project.
1977 In this release, if the configure option --disable-crypt is used, glibc
1978 will not install <crypt.h> or libcrypt, making room for the separate
1979 project's versions of these files. The plan is to make this the default
1980 behavior in a future release.
1982 Changes to build and runtime requirements:
1984 GNU make 4.0 or later is now required to build glibc.
1986 Security related changes:
1988 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1989 been fixed by removing the glibc-internal IDNA implementation and using
1990 the system-provided libidn2 library instead. Originally reported by Hanno
1991 Böck and Christian Weisgerber.
1993 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1994 architecture could corrupt memory. Reported by Max Horn.
1996 CVE-2018-11236: Very long pathname arguments to realpath function could
1997 result in an integer overflow and buffer overflow. Reported by Alexey
2000 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2001 architecture could write beyond the target buffer, resulting in a buffer
2002 overflow. Reported by Andreas Schwab.
2004 The following bugs are resolved with this release:
2006 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2007 [6889] manual: 'PWD' mentioned but not specified
2008 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2009 when __WORDSIZE != 64
2010 [13762] regex: re_search etc. should return -2 on memory exhaustion
2011 [13888] build: /tmp usage during testing
2012 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2013 [14092] nptl: Support C11 threads
2014 [14095] localedata: Review / update collation data from Unicode / ISO
2016 [14508] libc: -Wformat warnings
2017 [14553] libc: Namespace pollution loff_t in sys/types.h
2018 [14890] libc: Make NT_PRFPREG canonical.
2019 [15105] libc: Extra PLT references with -Os
2020 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2022 [16335] manual: Feature test macro documentation incomplete and out of
2024 [16552] libc: Unify umount implementations in terms of umount2
2025 [17082] libc: htons et al.: statement-expressions prevent use on global
2026 scope with -O1 and higher
2027 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2028 [17438] localedata: pt_BR: wrong d_fmt delimiter
2029 [17662] libc: please implement binding for the new renameat2 syscall
2030 [17721] libc: __restrict defined as /* Ignore */ even in c11
2031 [17979] libc: inconsistency between uchar.h and stdint.h
2032 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2033 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2034 horrible machine code)
2035 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2037 [18471] libc: llseek should be a compat symbol
2038 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2040 [18991] nss: nss_files skips large entry in database
2041 [19239] libc: Including stdlib.h ends up with macros major and minor being
2043 [19463] libc: linknamespace failures when compiled with -Os
2044 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2045 [19527] locale: Normalized charset name not recognized by setlocale
2046 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2047 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2049 [19728] network: out of bounds stack read in libidn function
2050 idna_to_ascii_4i (CVE-2016-6261)
2051 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2052 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2053 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2055 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2056 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2057 [20419] dynamic-link: files with large allocated notes crash in
2059 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2060 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2061 [20980] manual: CFLAGS environment variable replaces vital options
2062 [21163] regex: Assertion failure in pop_fail_stack when executing a
2063 malformed regexp (CVE-2015-8985)
2064 [21234] manual: use of CFLAGS makes glibc detect no optimization
2065 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2066 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2067 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2068 [21508] locale: intl/tst-gettext failure with latest msgfmt
2069 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2070 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2071 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2073 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2075 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2076 [22247] network: Integer overflow in the decode_digit function in
2077 puny_decode.c in libidn (CVE-2017-14062)
2078 [22342] nscd: NSCD not properly caching netgroup
2079 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2080 [22550] localedata: es_ES locale (and other es_* locales): collation
2081 should treat ñ as a primary different character, sync the collation
2082 for Spanish with CLDR
2083 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2084 by gcc configured with --enable-default-pie
2085 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2086 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2087 crossing 2GB threshold (CVE-2017-18269)
2088 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2090 [22735] time: Misleading typo in time.h source comment regarding
2092 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2093 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2094 `__assert_perror_fail ()' to `__assert_fail_base ()'
2095 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2097 [22786] libc: Stack buffer overflow in realpath() if input size is close
2098 to SSIZE_MAX (CVE-2018-11236)
2099 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2100 through an absolute DT_NEEDED path
2101 [22792] build: tcb-offsets.h dependency dropped
2102 [22797] libc: pkey_get() uses non-reserved name of argument
2103 [22807] libc: PTRACE_* constants missing for powerpc
2104 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2105 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2106 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2107 [22848] localedata: ca_ES: update date definitions from CLDR
2108 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2109 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2110 [22896] localedata: Update locale data for an_ES
2111 [22902] math: float128 test failures with GCC 8
2112 [22918] libc: multiple common of `__nss_shadow_database'
2113 [22919] libc: sparc32: backtrace yields infinite backtrace with
2115 [22926] libc: FTBFS on powerpcspe
2116 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2118 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2119 [22947] libc: FAIL: misc/tst-preadvwritev2
2120 [22963] localedata: cs_CZ: Add alternative month names
2121 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2122 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2123 [22998] dynamic-link: execstack tests are disabled when SELinux is
2125 [23005] network: Crash in __res_context_send after memory allocation
2127 [23007] math: strtod cannot handle -nan
2128 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2129 [23036] regex: regex equivalence class regression
2130 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2131 [23069] libc: sigaction broken on riscv64-linux-gnu
2132 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2133 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2134 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2135 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2136 and libc build with -Os)
2137 [23140] localedata: More languages need two forms of month names
2138 [23145] libc: _init/_fini aren't marked as hidden
2139 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2140 [23171] math: C++ iseqsig for long double converts arguments to double
2141 [23178] nscd: sudo will fail when it is run in concurrent with commands
2142 that changes /etc/passwd
2143 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2145 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2146 [23208] localedata: New locale - Lower Sorbian (dsb)
2147 [23233] regex: Memory leak in build_charclass_op function in file
2149 [23236] stdio: Harden function pointers in _IO_str_fields
2150 [23250] nptl: Offset of __private_ss differs from GCC
2151 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2152 -mtune=generic -mfpmath=sse
2153 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2155 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2156 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2158 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2159 [23277] math: nan function should not have const attribute
2160 [23279] math: scanf and strtod wrong for some hex floating-point
2161 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2163 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2164 [23303] build: undefined reference to symbol
2165 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2166 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2168 [23313] stdio: libio vtables validation and standard file object
2170 [23329] libc: The __libc_freeres infrastructure is not properly run across
2172 [23349] libc: Various glibc headers no longer compatible with
2174 [23351] malloc: Remove unused code related to heap dumps and malloc
2176 [23363] stdio: stdio-common/tst-printf.c has non-free license
2177 [23396] regex: Regex equivalence regression in single-byte locales
2178 [23422] localedata: oc_FR: More updates of locale data
2179 [23442] build: New warning with GCC 8
2180 [23448] libc: Out of bounds access in IBM-1390 converter
2181 [23456] libc: Wrong index_cpu_LZCNT
2182 [23458] build: tst-get-cpu-features-static isn't added to tests
2183 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2185 [23467] dynamic-link: x86/CET: A property note parser bug
2192 * The GNU C Library can now be compiled with support for building static
2193 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2194 executables are like static executables but can be loaded at any address
2195 and provide additional security hardening benefits at the cost of some
2196 memory and performance. When the library is built with --enable-static-pie
2197 the resulting libc.a is usable with GCC 8 and above to create static PIE
2198 executables using the GCC option '-static-pie'. This feature is currently
2199 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2200 aarch64 with binutils 2.30 or later.
2202 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2203 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2206 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2208 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2210 * In order to support faster and safer process termination the malloc API
2211 family of functions will no longer print a failure address and stack
2212 backtrace after detecting heap corruption. The goal is to minimize the
2213 amount of work done after corruption is detected and to avoid potential
2214 security issues in continued process execution. Reducing shutdown time
2215 leads to lower overall process restart latency, so there is benefit both
2216 from a security and performance perspective.
2218 * The abort function terminates the process immediately, without flushing
2219 stdio streams. Previous glibc versions used to flush streams, resulting
2220 in deadlocks and further data corruption. This change also affects
2221 process aborts as the result of assertion failures.
2223 * On platforms where long double has the IEEE binary128 format (aarch64,
2224 alpha, mips64, riscv, s390 and sparc), the math library now implements
2225 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2226 These are the same interfaces added in version 2.26 for some platforms where
2227 this format is supported but is not the format of long double.
2229 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2230 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2231 implements interfaces for that type, as defined by ISO/IEC TS
2232 18661-3:2015. These are corresponding interfaces to those supported for
2235 * The math library now implements interfaces for the _Float32, _Float64 and
2236 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2237 corresponding interfaces to those supported for _Float128.
2239 * glibc now implements the memfd_create and mlock2 functions on Linux.
2241 * Support for memory protection keys was added. The <sys/mman.h> header now
2242 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2245 * The copy_file_range function was added.
2247 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2249 * The ldconfig utility now processes `include' directives using the C/POSIX
2250 collation ordering. Previous glibc versions used locale-specific
2251 ordering, the change might break systems that relied on that.
2253 * Support for two grammatical forms of month names has been added.
2254 In a call to strftime, the "%B" and "%b" format specifiers will now
2255 produce the grammatical form required when the month is used as part
2256 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2257 required when the month is named by itself. For instance, in Greek
2258 and in many Slavic and Baltic languages, "%B" will produce the month
2259 in genitive case, and "%OB" will produce the month in nominative case.
2261 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2262 are all valid and will all accept any known form of month
2263 name---standalone or complete, abbreviated or full. In a call to
2264 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2265 the strings used by "%B" and "%b", respectively. New query
2266 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2267 used by "%OB" and "%Ob", respectively.
2269 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2270 define the strings for %OB and %Ob, respectively; these have the
2271 same syntax as "mon" and "abmon". These arrays are optional; if they
2272 are not provided then they have the same content as "mon" and "abmon",
2275 These features are provided for locales which define "alt_mon" and/or
2276 "ab_alt_mon" in their locale source data. This release includes such
2277 alternative month name data for the following languages: Belarusian,
2278 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2280 This feature is currently a GNU extension, but it is expected to
2281 be added to the next revision of POSIX, and it is also already
2282 available on some BSD-derived operating systems.
2284 This feature will cause existing statically compiled applications
2285 to fail to load locales and fall back to the builtin C/POSIX locales.
2286 See notes below for other changes affecting compatibility.
2288 * Support for the RISC-V ISA running on Linux has been added. This port
2289 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2290 for the following ISA and ABI pairs:
2296 Deprecated and removed features, and other changes affecting compatibility:
2298 * Statically compiled applications attempting to load locales compiled for the
2299 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2300 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2301 support for two grammatical forms of the month names, also extends the locale
2302 data binary format. Static applications needing locale support must be
2303 recompiled to match the runtime and data they are deployed with. In some
2304 distributions there is an upgrade window where dynamically linked applications
2305 may use a new library but the old locale data and also fall back to the
2306 builtin C/POSIX locales; restarting the application process is sufficient to
2309 * Support for statically linked applications which call dlopen is deprecated
2310 and will be removed in a future version of glibc. Applications which call
2311 dlopen need to be linked dynamically instead.
2313 * Support for old programs which use internal stdio data structures and
2314 functions is deprecated. This includes programs which use the C++ streams
2315 provided by libstdc++ in GCC 2.95. Programs which use the internal
2316 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2317 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2318 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2319 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2320 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2321 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2322 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2323 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2324 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2325 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2326 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2327 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2328 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2329 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2330 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2331 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2332 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2333 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2334 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2335 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2336 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2337 future version of glibc. Unlike other symbol removals, these old
2338 applications will not be supported using compatibility symbols.
2340 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2341 defined by <sys/ptrace.h>.
2343 * libm no longer supports SVID error handling (calling a user-provided
2344 matherr function on error) or the _LIB_VERSION variable to control error
2345 handling. (SVID error handling and the _LIB_VERSION variable still work
2346 for binaries linked against older versions of the GNU C Library.) The
2347 libieee.a library is no longer provided. math.h no longer defines struct
2348 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2349 TLOSS, PLOSS and HUGE.
2351 * The libm functions pow10, pow10f and pow10l are no longer supported for
2352 new programs. Programs should use the standard names exp10, exp10f and
2353 exp10l for these functions instead.
2355 * The mcontext_t type is no longer the same as struct sigcontext. On
2356 platforms where it was previously the same, this changes the C++ name
2357 mangling for interfaces involving this type.
2359 * The add-ons mechanism for building additional packages at the same time as
2360 glibc has been removed. The --enable-add-ons configure option is now
2363 * The --without-fp configure option is now ignored. Whether hardware
2364 floating-point instructions are used is now configured based on whether
2365 the compiler used at configure time (without any options implied by a
2366 --with-cpu= configure option) uses such instructions.
2368 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2369 the specified string can be parsed as a domain name.
2371 * In the malloc_info output, the <heap> element may contain another <aspace>
2372 element, "subheaps", which contains the number of sub-heaps.
2374 * The libresolv function p_secstodate is no longer supported for new
2377 * The tilepro-*-linux-gnu configuration is no longer supported.
2379 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2380 and will be removed in a future release. Software that is still using
2381 either header should be updated to use standard <stdio.h> interfaces
2384 libio.h was originally the header for a set of supported GNU extensions,
2385 but they have not been maintained as such in many years, they are now
2386 standing in the way of improvements to stdio, and we don't think there are
2387 any remaining external users. _G_config.h was never intended for public
2388 use, but predates the bits convention.
2390 Changes to build and runtime requirements:
2392 * bison version 2.7 or later is required to generate code in the 'intl'
2395 Security related changes:
2397 CVE-2009-5064: The ldd script would sometimes run the program under
2398 examination directly, without preventing code execution through the
2399 dynamic linker. (The glibc project disputes that this is a security
2400 vulnerability; only trusted binaries must be examined using the ldd
2403 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2404 suffered from a one-byte overflow during ~ operator processing (either
2405 on the stack or the heap, depending on the length of the user name).
2406 Reported by Tim Rühsen.
2408 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2409 would sometimes fail to free memory allocated during ~ operator
2410 processing, leading to a memory leak and, potentially, to a denial
2413 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2414 without GLOB_NOESCAPE, could write past the end of a buffer while
2415 unescaping user names. Reported by Tim Rühsen.
2417 CVE-2017-17426: The malloc function, when called with an object size near
2418 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2419 instead of NULL. This was a regression introduced with the new malloc
2420 thread cache in glibc 2.26. Reported by Iain Buclaw.
2422 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2423 to the allocation of too much memory. (This is not a security bug per se,
2424 it is mentioned here only because of the CVE assignment.) Reported by
2427 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2428 of the number of search path components. (This is not a security
2429 vulnerability per se because no trust boundary is crossed if the fix for
2430 CVE-2017-1000366 has been applied, but it is mentioned here only because
2431 of the CVE assignment.) Reported by Qualys.
2433 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2434 for AT_SECURE or SUID binaries could be used to load libraries from the
2437 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2438 succeeds without returning an absolute path due to unexpected behaviour
2439 of the Linux kernel getcwd syscall. Reported by halfdog.
2441 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2442 an object size near the value of SIZE_MAX, would return a pointer to a
2443 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2445 CVE-2018-6551: The malloc function, when called with an object size near
2446 the value of SIZE_MAX, would return a pointer to a buffer which is too
2447 small, instead of NULL.
2449 The following bugs are resolved with this release:
2451 [866] glob: glob should match dangling symlinks
2452 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2453 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2455 [5997] math: Very slow execution of sinf function
2456 [10580] localedata: hr_HR: updated locale
2457 [10871] locale: 'mon' array should contain both nominative and genitive
2459 [12349] localedata: eu_ES: incorrect thousands separator
2460 [13605] localedata: shn_MM: new Shan locale
2461 [13805] localedata: ru_RU: currency should use ',' as radix point
2462 [13953] localedata: km_KH: locale update
2463 [13994] localedata: mjw_IN: new locale
2464 [14121] build: make writes .mo files in po directory
2465 [14333] libc: Fix the race between atexit() and exit()
2466 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2467 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2469 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2470 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2471 width Latin characters
2472 [15332] localedata: es_CU: locale update
2473 [15436] stdio: Don't close or flush stdio streams on abort
2474 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2476 [16148] localedata: ca_ES: incorrect thousands separator
2477 [16750] dynamic-link: ldd should not try to execute the binaries
2479 [16777] localedata: pl_PL: incorrect thousands separator in locale
2480 [16905] localedata: hanzi: new collation
2481 [17563] localedata: cmn_TW: add hanzi collation
2482 [17750] localedata: wrong collation order of diacritics in most locales
2483 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2485 [17956] build: Build fails on missing definitions from header file
2486 nss/nss.h when Mozilla NSS is used for cryptography
2487 [18203] libc: realpath() does not handle unreachable paths correctly
2488 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2489 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2490 [18822] libc: Internal functions are called via PLT
2491 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2492 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2493 [19574] libc: glibc should support building static PIE binaries
2494 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2496 [19971] glob: glob: Do not skip entries with zero d_ino values
2497 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2498 [20008] localedata: km_KH: convert to translit_neutral
2499 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2500 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2501 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2502 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2503 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2505 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2506 they're set, wrong errors returned by gaih_inet when lookup functions
2508 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2509 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2511 [20952] localedata: yuw_PG: new locale
2512 [21084] localedata: charmaps/IBM858: new codepage
2513 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2514 [21242] libc: assert gives pedantic warning in old gcc versions
2515 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2516 __regcall calling convention
2517 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2518 [21326] libc: C99 functions are not declared for C++11 and later if
2519 _GNU_SOURCE is not predefined by g++
2520 [21457] libc: sys/ucontext.h namespace
2521 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2522 [21660] math: GCC fails to compile a formula with tgmath.h
2523 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2524 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2525 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2526 [21684] math: tgmath.h handling of complex integers
2527 [21685] math: tgmath.h handling of bit-fields
2528 [21686] math: tgmath.h handling of __int128
2529 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2531 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2533 [21750] localedata: column width of characters incompatible with classical
2535 [21754] malloc: malloc: Perform as little work as possible after heap
2536 consistency check failures
2537 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2538 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2539 [21791] string: Unused XXX_chk_XXX functions in libc.a
2540 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2542 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2544 [21845] localedata: Added new Locale bho_NP
2545 [21853] localedata: Fix abday Which looks same as day in zh_SG
2546 [21854] localedata: Added New Locale en_SC
2547 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2548 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2549 _dl_runtime_resolve_avx_slow
2550 [21885] network: getaddrinfo: gethosts does not release resolver context
2551 on memory allocation failure
2552 [21899] libc: XPG4.2 sigaction namespace
2553 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2555 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2557 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2558 errno value, causing getaddrinfo to fail
2559 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2560 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2561 instead of EAI_NODATA
2562 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2563 constant PTRACE_SEIZE_DEVEL
2564 [21930] math: C-only gcc builtins used in <math.h> isinf
2565 [21932] network: Unpaired __resolv_context_get in generic get*_r
2567 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2568 [21944] libc: sigval namespace
2569 [21951] localedata: Update hanzi collation by stroke
2570 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2571 sysdeps/x86_64/fpu/e_expf.S
2572 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2573 allocation in syscall loops)
2574 [21959] localedata: Fix Country name for xh_ZA
2575 [21960] localedata: Fix abmon for bem_ZM
2576 [21966] math: AVX2 mathvec functions use FMA without checking
2577 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2578 [21971] localedata: Added New Locale for mfe_MU
2579 [21972] libc: assert macro requires operator== (int) for its argument type
2580 [21973] math: [sparc] libm missing sqrtl compat symbol
2581 [21974] libc: Remove __bb_init_func and __bb_exit_func
2582 [21982] string: stratcliff.c: error: assuming signed overflow does not
2584 [21986] stdio: __guess_grouping is called incorrectly
2585 [21987] math: [sparc32] wrong bits/long-double.h installed
2586 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2588 [22022] localedata: Missing country_name for mni_IN
2589 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2591 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2593 [22026] locale: iconv_open: heap overflow on gconv_init failure
2594 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2595 [22035] math: [m68k] bits/math-inline.h macro namespace
2596 [22038] localedata: Fix abbreviated weeks and months for Somali
2597 [22044] localedata: Remove redundant data for Limburgish Language
2598 [22050] malloc: Linking with -lmcheck does not hook
2599 __malloc_initialize_hook correctly
2600 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2601 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2602 [22070] localedata: charmaps/UTF-8: wcwidth for
2603 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2604 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2605 Jungseong and Jongseong) should be 0
2606 [22078] nss: nss_files performance issue in multi mode
2607 [22082] math: bits/math-finite.h exp10 condition
2608 [22086] libc: pcprofiledump incorrect cross-endian condition
2609 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2610 [22095] network: Name server address allocation memory leak in resolv.conf
2612 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2614 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2615 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2617 [22111] malloc: malloc: per thread cache is not returned when thread exits
2618 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2619 [22134] libc: [linux] implement fexecve with execveat
2620 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2622 [22145] libc: ttyname() gives up too early in the face of namespaces
2623 [22146] math: C++ build issue with float128 on x86_64
2624 [22153] nptl: nptl: save error code before process termination
2625 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2626 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2627 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2628 [22165] libc: [hppa] Text relocations in libc.so
2629 [22180] libc: destructor registered via __cxa_atexit is called twice
2630 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2631 symlinks") cause "make" segfaults
2632 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2634 [22207] libc: FAIL: stdlib/test-atexit-race
2635 [22225] math: nearbyint arithmetic moved before feholdexcept
2636 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2637 [22235] math: iscanonical in C++ and float128
2638 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2639 the svid compat wrapper
2640 [22244] math: ynf and yn are wrong without the svid compat wrapper
2641 [22273] libc: Improper assert in Linux posix_spawn implementation
2642 [22284] libc: -pg -pie doesn't work
2643 [22292] locale: localedef exits with error 4 when it should be error 1
2644 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2645 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2647 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2648 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2650 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2651 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2652 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2653 [22322] libc: [mips64] wrong bits/long-double.h installed
2654 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2655 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2657 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2658 [22343] malloc: Integer overflow in posix_memalign
2659 [22347] libc: getrandom() returns the number of bytes that were copied to
2660 the buffer even though the comments say "Return 0 on success and -1 on
2662 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2663 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2665 [22370] dynamic-link: Incorrect note padding check
2666 [22375] libc: malloc returns pointer from tcache_get when should return
2667 NULL (CVE-2017-17426)
2668 [22377] math: iseqsig, float128 and C++
2669 [22382] localedata: Error in tpi_PG locale
2670 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2671 inside the ASCII printable range
2672 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2674 [22403] localedata: Slash needs escaping in some locales
2675 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2676 [22409] network: res_hnok does not accept some host names used on the
2678 [22412] network: res_dnok, res_hnok should perform syntax checks
2679 [22413] network: ns_name_pton ignores syntactically invalid trailing
2681 [22415] stdio: setvbuf can lead to invalid free/segfault
2682 [22432] build: Non-deterministic build
2683 [22439] malloc: malloc_info should compute summary statistics for all sub-
2685 [22442] network: if_nametoindex could report index for the wrong
2686 networking interface
2687 [22446] build: aliasing violation calling readlink in handle_request
2688 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2689 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2690 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2691 __nscd_hash/__nss_hash
2692 [22463] network: p_secstodate overflow handling
2693 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2694 [22478] libc: sigwait can fail with EINTR
2695 [22505] libc: ldconfig processes include directive in locale-specific
2697 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2698 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2699 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2700 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2701 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2702 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2703 same as for Croatian
2704 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2705 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2706 [22577] libc: missing newline after "cannot allocate TLS data structures
2708 [22588] manual: manual/conf.texi: missing underscore in front of
2710 [22593] math: nextafter and nexttoward are declared with const attribute
2711 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2712 [22603] string: ia64 memchr overflows internal pointer check
2713 [22605] libc: SH clone does not set the exit code correctly
2714 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2716 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2717 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2718 modified in case of success
2719 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2720 [22615] manual: manual: ambiguous wording about errno value in case of
2722 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2724 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2725 binaries or if /proc is not mounted (CVE-2017-16997)
2726 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2727 [22630] build: $(no-pie-ldflag) is no longer effective
2728 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2729 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2730 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2731 [22637] nptl: guard size is subtracted from thread stack size instead of
2733 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2734 [22657] localedata: hu_HU: Avoid double space in date
2735 [22660] math: fmax, fmin sNaN handling on alpha
2736 [22664] libc: New warning of GCC8
2737 [22665] math: alpha: ceil and floor raise inexact exceptions
2738 [22666] math: alpha: trunc raise inexact exceptions
2739 [22667] libc: makecontext lacks stack alignment on i386
2740 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2741 [22679] libc: getcwd(3) can succeed without returning an absolute path
2743 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2744 elision and tunables
2745 [22687] math: [powerpc-nofpu] complex long double functions spurious
2747 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2748 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2749 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2751 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2752 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2754 [22701] nis: Incomplete removal of libnsl
2755 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2756 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2757 [22715] dynamic-link: FAIL: elf/tst-audit10
2758 [22719] libc: Backtrace tests fail on hppa
2759 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2760 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2761 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2762 before the first call to crypt_r () in crypt/badsalttest.c
2769 * A per-thread cache has been added to malloc. Access to the cache requires
2770 no locks and therefore significantly accelerates the fast path to allocate
2771 and free small amounts of memory. Refilling an empty cache requires locking
2772 the underlying arena. Performance measurements show significant gains in a
2773 wide variety of user workloads. Workloads were captured using a special
2774 instrumented malloc and analyzed with a malloc simulator. Contributed by
2775 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2777 * Unicode 10.0.0 Support: Character encoding, character type info, and
2778 transliteration tables are all updated to Unicode 10.0.0, using
2779 generator scripts contributed by Mike FABIAN (Red Hat).
2780 These updates cause user visible changes, especially the changes in
2781 wcwidth for many emoji characters cause problems when emoji sequences
2782 are rendered with pango, see for example:
2783 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2785 * Collation of Hungarian has been overhauled and is now consistent with "The
2786 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2789 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2791 - The GNU C Library will now detect when /etc/resolv.conf has been
2792 modified and reload the changed configuration. The new resolver option
2793 “no-reload” (RES_NORELOAD) disables this behavior.
2795 - The GNU C Library now supports an arbitrary number of search domains
2796 (configured using the “search” directive in /etc/resolv.conf);
2797 previously, there was a hard limit of six domains. For backward
2798 compatibility, applications that directly modify the ‘_res’ global
2799 object are still limited to six search domains.
2801 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2802 Library will now randomly pick a name server from the configuration as a
2803 starting point. (Previously, the second name server was always used.)
2805 * The tunables feature is now enabled by default. This allows users to tweak
2806 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2808 * New function reallocarray, which resizes an allocated block (like realloc)
2809 to the product of two sizes, with a guaranteed clean failure upon integer
2810 overflow in the multiplication. Originally from OpenBSD, contributed by
2811 Dennis Wölfing and Rüdiger Sonderfeld.
2813 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2814 These are extended versions of preadv and pwritev, respectively, taking an
2815 additional flags argument. The set of supported flags depends on the
2816 running kernel; full support currently requires kernel 4.7 or later.
2818 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2819 create a new session ID for the spawned process. This feature is
2820 scheduled to be added to the next major revision of POSIX; for the time
2821 being, it is available under _GNU_SOURCE.
2823 * errno.h is now safe to use from C-preprocessed assembly language on all
2824 supported operating systems. In this context, it will only define the
2825 Exxxx constants, as preprocessor macros expanding to integer literals.
2827 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2828 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2829 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2830 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2832 To compile programs that use this feature, the compiler must support
2833 128-bit floating point with the type name _Float128 (as defined by TS
2834 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2835 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2836 must be defined to make the new interfaces visible.
2838 The new functions and macros correspond to those present for other
2839 floating-point types (except for a few obsolescent interfaces not
2840 supported for the new type), with F128 or f128 suffixes; for example,
2841 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2842 printf or scanf formats for the new type; the strfromf128 and strtof128
2843 interfaces should be used instead.
2845 Deprecated and removed features, and other changes affecting compatibility:
2847 * The synchronization that pthread_spin_unlock performs has been changed to
2848 now be equivalent to a C11 atomic store with release memory order to the
2849 spin lock's memory location. Previously, several (but not all)
2850 architectures used stronger synchronization (e.g., containing what is
2851 often called a full barrier). This change can improve performance, but
2852 may affect odd fringe uses of spin locks that depend on the previous
2853 behavior (e.g., using spin locks as atomic variables to try to implement
2854 Dekker's mutual exclusion algorithm).
2856 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2859 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2860 will only be built and installed when the GNU C Library is configured with
2861 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2862 as TIRPC or rpcsvc-proto, to be used.
2864 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2865 libnss_compat, are deprecated, and will not be built or installed by
2868 The NIS(+) support library, libnsl, is also deprecated. By default, a
2869 compatibility shared library will be built and installed, but not headers
2870 or development libraries. Only a few NIS-related programs require this
2871 library. (In particular, the GNU C Library has never required programs
2872 that use 'gethostbyname' to be linked with libnsl.)
2874 Replacement implementations based on TIRPC, which additionally support
2875 IPv6, are available from <https://github.com/thkukuk/>. The configure
2876 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2877 name service modules, to be built and installed.
2879 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2880 support is enabled, the configured recursive resolver must support EDNS.
2881 (Responding to EDNS-enabled queries with responses which are not
2882 EDNS-enabled is fine, but FORMERR responses are not.)
2884 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2885 servers have not supported this opcode for a long time.
2887 * The _res_opcodes variable has been removed from libresolv. It had been
2888 exported by accident.
2890 * <string.h> no longer includes inline versions of any string functions,
2891 as this kind of optimization is better done by the compiler. The macros
2892 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2894 * The nonstandard header <xlocale.h> has been removed. Most programs should
2895 use <locale.h> instead. If you have a specific need for the definition of
2896 locale_t with no other declarations, please contact
2897 libc-alpha@sourceware.org and explain.
2899 * The obsolete header <sys/ultrasound.h> has been removed.
2901 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2903 * The obsolete function cfree has been removed. Applications should use
2906 * The stack_t type no longer has the name struct sigaltstack. This changes
2907 the C++ name mangling for interfaces involving this type.
2909 * The ucontext_t type no longer has the name struct ucontext. This changes
2910 the C++ name mangling for interfaces involving this type.
2912 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2913 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2914 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2915 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2916 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2917 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2918 fpregset_t type no longer has the name struct fpu. This changes the C++
2919 name mangling for interfaces involving those types.
2921 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2922 synced with the kernel:
2924 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2925 are not supported on this architecture and have been removed.
2927 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2928 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2929 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2931 Programs that assume the GET/SETREGS ptrace requests are universally
2932 available will now fail to build, instead of malfunctioning at runtime.
2934 Changes to build and runtime requirements:
2936 * Linux kernel 3.2 or later is required at runtime, on all architectures
2937 supported by that kernel. (This is a change from version 2.25 only for
2940 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2942 * On most architectures, GCC 4.9 or later is required to build the GNU C
2943 Library. On powerpc64le, GCC 6.2 or later is required.
2945 Older GCC versions and non-GNU compilers are still supported when
2946 compiling programs that use the GNU C Library. (We do not know exactly
2947 how old, and some GNU extensions to C may be _de facto_ required. If you
2948 are interested in helping us make this statement less vague, please
2949 contact libc-alpha@sourceware.org.)
2951 Security related changes:
2953 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2954 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2956 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2957 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2959 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2960 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2963 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2964 fixed (CVE-2017-12133).
2966 The following bugs are resolved with this release:
2968 [984] network: Respond to changed resolv.conf in gethostbyname
2969 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2970 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2972 [12189] libc: __stack_chk_fail should not attempt a backtrace
2974 [14096] time: Race condition on timezone/tst-timezone.out
2975 [14172] localedata: az_IR: new locale
2976 [14995] build: glibc fails to build if gold is the default linker, even if
2978 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2979 [16637] network: inet_pton function is accepting IPv6 with bad format
2980 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2981 x86 and other generic code
2982 [16875] localedata: ko_KR: fix lang_name
2983 [17225] localedata: ar_SY: localized month names for May and June are
2985 [17297] localedata: da_DK: wrong date_fmt string
2986 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2987 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2988 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2989 [19066] localedata: ar_SA abbreviated day and month names are in English
2990 [19569] network: resolv: Support an arbitrary number of search domains
2991 [19570] network: Implement random DNS server selection in the stub
2993 [19838] locale: localedef fails on PA-RISC
2994 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2995 order of 0D36 and 0D37
2996 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2998 [20098] libc: FAIL: debug/backtrace-tst on hppa
2999 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3001 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3003 [20313] localedata: Update locale data to Unicode 9.0
3004 [20424] manual: Document how to provide a malloc replacement
3005 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3007 [20686] locale: Add el_GR@euro to SUPPORTED.
3008 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3009 failures consistently
3010 [21015] dynamic-link: Document and fix --enable-bind-now
3011 [21016] nptl: pthread_cond support is broken on hppa
3012 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3013 frame-pointer on i386
3014 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3016 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3017 [21088] libc: Build fails with --enable-static-nss
3018 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3019 generic c code is used
3020 [21109] libc: Tunables broken on big-endian
3021 [21112] math: powf has large ulp errors with base close to 1 and exponent
3023 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3025 [21120] malloc: glibc malloc is incompatible with GCC 7
3026 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3028 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3029 (-0.0) when linking with -lieee
3030 [21171] math: log10, log2 and lgamma return incorrect results
3031 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3032 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3033 [21207] localedata: ce_RU: update weekdays from CLDR
3034 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3035 [21217] localedata: Update months from CLDR-31
3036 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3037 [21243] libc: support_delete_temp_file should issue warning for failed
3039 [21244] libc: support resolv_test_start() socket fd close should be
3041 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3042 new posix_spawn implementation
3043 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3044 leads to lower CPU frequency
3045 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3046 [21261] libc: [sparc64] bits/setjmp.h namespace
3047 [21267] network: [mips] bits/socket.h IOC* namespace
3048 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3049 [21270] libc: mmap64 silently truncates large offset values
3050 [21275] libc: posix_spawn always crashes on ia64 now
3051 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3052 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3053 [21289] libc: Incorrect declaration for 32-bit platforms with
3054 _FILE_OFFSET_BITS=64 causes build error
3055 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3056 not support gethostbyname4_r
3057 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3059 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3061 [21340] libc: Support POSIX_SPAWN_SETSID
3062 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3063 [21359] network: ns_name_pack needs additional byte in destination buffer
3064 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3065 against fragmentation attacks (CVE-2017-12132)
3066 [21369] network: resolv: Remove EDNS fallback
3067 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3069 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3070 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3071 [21393] stdio: Missing dup3 error check in freopen, freopen64
3072 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3073 [21399] localedata: Bad description for U00EC in
3074 localedata/charmaps/CP1254
3075 [21411] malloc: realloc documentation error
3076 [21426] network: sys/socket.h uio.h namespace
3077 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3078 [21445] libc: signal.h bsd_signal namespace
3079 [21455] network: Network headers stdint.h namespace
3080 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3082 [21475] network: resolv: Overlong search path is truncated mid-label
3083 [21511] libc: sigstack namespace
3084 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3085 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3086 bits/syscall.h: No such file or directory
3087 [21517] libc: struct sigaltstack namespace
3088 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3089 [21533] localedata: Update locale data to Unicode 10.0
3091 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3092 junk at end of line, first unrecognized character is `@'
3093 [21538] libc: SIG_HOLD missing for XPG4
3094 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3095 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3096 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3097 [21543] libc: sigevent namespace
3098 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3099 size for general purpose registers in mcontext_t structure
3100 [21550] libc: sigwait namespace
3101 [21552] libc: XPG4 bsd_signal namespace
3102 [21554] libc: sigpause namespace
3103 [21560] libc: sys/wait.h signal.h namespace
3104 [21561] libc: waitid namespace
3105 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3106 '/usr/include/stdlib.h': Permission denied
3107 [21575] libc: sys/wait.h missing struct rusage definition
3108 [21584] libc: sigaltstack etc namespace
3109 [21597] libc: siginterrupt namespace
3110 [21607] math: hppa: FAIL: math/test-tgmath
3111 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3113 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3114 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3115 stack and heap (CVE-2017-1000366)
3116 [21625] libc: wait3 namespace
3117 [21654] nss: Incorrect pointer alignment in NSS group merge result
3119 [21657] network: Parse interface zone id for node-local multicast
3120 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3122 [21666] libc: .symver is used on common symbol
3123 [21668] network: resolv: res_init cross-thread broadcast introduces race
3125 [21687] math: tgmath.h totalorder, totalordermag return type
3126 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3128 [21696] libc: Incorrect assumption of of __cpu_mask in
3129 posix/sched_cpucount.c
3130 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3131 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3133 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3134 leading to relocation crash
3135 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3136 `resolv_conf_matches (resp, conf)' failed.
3137 [21710] localedata: Added Samoan language locale for Samoa
3138 [21711] localedata: Pashto yesstr/nostr locale are missing
3139 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3140 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3141 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3142 [21723] localedata: yesstr/nostr missing for Chinese language locale
3143 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3145 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3147 [21728] localedata: New Locale for Tongan language
3148 [21729] localedata: incorrect LC_NAME fields for hi_IN
3149 [21733] localedata: yesstr and nostr are missing for zh_HK
3150 [21734] localedata: Missing yesstr and nostr are for kw_GB
3151 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3152 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3153 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3154 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3156 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3158 [21749] localedata: Wrong abbreviated day name (“abday”) for
3160 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3161 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3162 [21759] localedata: missing yesstr and nostr for Tigrinya
3163 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3164 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3165 [21767] localedata: Missing Bislama locales
3166 [21768] localedata: Missing yesstr and nostr for aa_ET
3167 [21770] localedata: Missing Field in li_NL
3168 [21778] nptl: Robust mutex may deadlock
3169 [21779] libc: MicroBlaze segfaults when loading libpthread
3170 [21783] localedata: Fix int_select international_call_prefixes
3171 [21784] localedata: Inconsistency in country_isbn
3172 [21788] localedata: Missing Country Postal Abbreviations
3173 [21794] localedata: Added-country_isbn-for-Italy
3174 [21795] localedata: Add/Fix country_isbn for France
3175 [21796] localedata: Added country_isbn for Republic of Korea
3176 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3177 [21799] localedata: Added int_select international_call_prefixes
3178 [21801] localedata: Added int_select international_call_prefixes
3179 [21804] nptl: Double semicolon in thread-shared-types.h
3180 [21807] localedata: LC_ADDRESS fix for pap_CW
3181 [21808] localedata: Fix LC_ADDRESS for pap_AW
3182 [21821] localedata: Added country_name in mai_IN
3183 [21822] localedata: Fix LC_TIME for mai_IN
3184 [21823] localedata: missing yesstr, nostr for sa_IN
3185 [21825] localedata: Fix name_mrs for mag_IN
3186 [21828] localedata: 2.26 changelog should mention user visible changes
3188 [21835] localedata: Added Maithili language locale for Nepal
3189 [21838] localedata: Removed redundant data for the_NP
3190 [21839] localedata: Fix LC_MONETARY for ta_LK
3191 [21844] localedata: Fix Latin characters and Months Sequence.
3192 [21848] localedata: Fix mai_NP Title Name
3197 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3198 24731-2:2010, is supported to enable declarations of functions from that
3199 TR. Note that not all functions from that TR are supported by the GNU C
3202 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3203 18661-1:2014, is supported to enable declarations of functions and macros
3204 from that TS. Note that not all features from that TS are supported by
3207 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3208 18661-4:2015, is supported to enable declarations of functions and macros
3209 from that TS. Note that most features from that TS are not supported by
3212 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3213 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3214 Since the GNU C Library defaults to a much newer revision of POSIX, this
3215 will only affect programs that specifically request an old conformance
3216 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3217 see a change in the visible declarations, but a program compiled with
3218 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3221 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3222 defined by all multithreaded code, but glibc has not required this for
3225 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3226 means that in a future release, the macros “major”, “minor”, and “makedev”
3227 will only be available from <sys/sysmacros.h>.
3229 These macros are not part of POSIX nor XSI, and their names frequently
3230 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3231 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3232 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3235 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3236 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3237 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3239 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3240 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3241 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3242 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3243 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3244 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3245 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3246 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3247 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3248 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3249 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3252 * New <math.h> features are added from TS 18661-1:2014:
3254 - Signaling NaN macros: SNANF, SNAN, SNANL.
3256 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3257 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3258 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3260 - llogb functions: the llogb, llogbf and llogbl functions, and the
3261 FP_LLOGB0 and FP_LLOGBNAN macros.
3263 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3266 - Comparison macros: iseqsig.
3268 - Classification macros: iscanonical, issubnormal, iszero.
3270 - Total order functions: totalorder, totalorderf, totalorderl,
3271 totalordermag, totalordermagf, totalordermagl.
3273 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3275 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3276 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3278 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3279 are added to libc. They convert a floating-point number into string.
3281 * Most of glibc can now be built with the stack smashing protector enabled.
3282 It is recommended to build glibc with --enable-stack-protector=strong.
3283 Implemented by Nick Alcock (Oracle).
3285 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3286 intended to be used instead of memset() to erase sensitive data after use;
3287 the compiler will not optimize out calls to explicit_bzero even if they
3288 are "unnecessary" (in the sense that no _correct_ program can observe the
3289 effects of the memory clear).
3291 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3292 to float instead of double. This does not affect the ABI of any libraries
3293 that are part of the GNU C Library, but may affect the ABI of other
3294 libraries that use this type in their interfaces.
3296 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3297 float_t and double_t types are now defined to long double instead of float
3298 and double. These options are not the default, and this does not affect
3299 the ABI of any libraries that are part of the GNU C Library, but it may
3300 affect the ABI of other libraries that use this type in their interfaces,
3301 if they are compiled or used with those options.
3303 * The getentropy and getrandom functions, and the <sys/random.h> header file
3306 * The buffer size for byte-oriented stdio streams is now limited to 8192
3307 bytes by default. Previously, on Linux, the default buffer size on most
3308 file systems was 4096 bytes (and thus remains unchanged), except on
3309 network file systems, where the buffer size was unpredictable and could be
3310 as large as several megabytes.
3312 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3313 for the Linux quota interface which predates kernel version 2.4.22 has
3316 * The malloc_get_state and malloc_set_state functions have been removed.
3317 Already-existing binaries that dynamically link to these functions will
3318 get a hidden implementation in which malloc_get_state is a stub. As far
3319 as we know, these functions are used only by GNU Emacs and this change
3320 will not adversely affect already-built Emacs executables. Any undumped
3321 Emacs executables, which normally exist only during an Emacs build, should
3322 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3324 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3325 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3326 “no-ip6-dotint” had already been the default, and support for the
3327 “ip6-dotint” option was removed from the Internet in 2006.
3329 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3330 flag from <resolv.h> have been removed. The option relied on a
3331 backwards-incompatible DNS extension which was never deployed on the
3334 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3335 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3336 They were already unimplemented.
3338 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3339 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3340 removed again from the IETF name lookup interface specification in RFC
3341 2553. Applications should use getaddrinfo instead.
3343 * DNSSEC-related declarations and definitions have been removed from the
3344 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3345 decode the data part of DNSSEC record types. Previous versions of glibc
3346 only implemented minimal support for the previous version of DNSSEC, which
3347 is incompatible with the currently deployed version.
3349 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3350 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3351 <arpa/nameser.h> header file because the distinction between RR types and
3352 meta-RR types is not officially standardized, subject to revision, and
3353 thus not suitable for encoding in a macro.
3355 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3356 and rhook members of the res_state type in <resolv.h> have been removed.
3357 The glibc stub resolver did not support these hooks, but the header file
3358 did not reflect that.
3360 * For multi-arch support it is recommended to use a GCC which has
3361 been built with support for GNU indirect functions. This ensures
3362 that correct debugging information is generated for functions
3363 selected by IFUNC resolvers. This support can either be enabled by
3364 configuring GCC with '--enable-gnu-indirect-function', or by
3365 enabling it by default by setting 'default_gnu_indirect_function'
3366 variable for a particular architecture in the GCC source file
3369 * GDB pretty printers have been added for mutex and condition variable
3370 structures in POSIX Threads. When installed and loaded in gdb these pretty
3371 printers show various pthread variables in human-readable form when read
3372 using the 'print' or 'display' commands in gdb.
3374 * Tunables feature added to allow tweaking of the runtime for an application
3375 program. This feature can be enabled with the '--enable-tunables' configure
3376 flag. The GNU C Library manual has details on usage and README.tunables has
3377 instructions on adding new tunables to the library.
3379 * A new version of condition variables functions have been implemented in
3380 the NPTL implementation of POSIX Threads to provide stronger ordering
3383 * A new version of pthread_rwlock functions have been implemented to use a more
3384 scalable algorithm primarily through not using a critical section anymore to
3387 Security related changes:
3389 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3390 have been created with makecontext could fail to terminate due to a
3391 missing .cantunwind annotation. This has been observed to lead to a hang
3392 (denial of service) in some Go applications compiled with gccgo. Reported
3393 by Andreas Schwab. (CVE-2016-6323)
3395 * The DNS stub resolver functions would crash due to a NULL pointer
3396 dereference when processing a query with a valid DNS question type which
3397 was used internally in the implementation. The stub resolver now uses a
3398 question type which is outside the range of valid question type values.
3401 The following bugs are resolved with this release:
3403 [4099] stdio: Overly aggressive caching by stream i/o functions.
3404 [7065] build: Support building glibc with -fstack-protector or -fstack-
3406 [9842] localedata: en_CA: incorrect date format
3407 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3408 before it started waiting
3409 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3410 [15765] nptl: sem_open is wrongly a cancellation point
3411 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3412 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3414 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3415 library linked with pthread
3416 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3417 "FIXME: Ingo" issue)
3418 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3419 [17252] libc: getrandom and getentropy syscall
3420 [17730] malloc: thread-local storage is sometimes improperly free()'d
3421 after being __libc_memalign()'d
3422 [18241] stdio: failed fseek on memstream does not set errno and can fail
3424 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3426 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3427 PTHREAD_PRIO_INHERIT mutex on ARM
3428 [18784] network: res_query and related function crash for special record
3429 type queries (CVE-2015-5180)
3430 [19380] math: strtod does not raise "inexact"
3431 [19387] string: Integer overflow in memchr
3432 [19390] string: Integer overflow in strncat
3433 [19398] build: linknamespace tests fail with massively parallel build
3434 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3436 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3437 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3438 [19514] libc: [PATCH] Fix spelling errors in spelling
3439 "implement"/"implementation" in several places
3440 [19582] network: Deprecate RES_USE_INET6
3441 [19673] manual: clog10 docs appear to be erroneous
3442 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3443 causes a segmentation fault
3444 [19826] libc: invalid pointer returned from __tls_get_addr with static
3446 [20016] network: resolv: Remove hooks support from the API
3447 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3449 [20033] math: [x86_64] vectorized math function don't call the __finite
3451 [20116] nptl: use after free in pthread_create
3452 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3453 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3455 [20311] nptl: please install proc_service.h
3456 [20366] libc: Compilation errors in installed headers in strict-compliance
3458 [20370] malloc: malloc: Arena free list management is still racy
3459 (incorrect fix in bug 19243)
3460 [20386] libc: assert (X = 0) does not result in GCC warning
3461 [20432] malloc: malloc: Minimize interface required for interposition
3462 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3463 in _Unwind_Backtrace (CVE-2016-6323)
3464 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3465 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3467 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3468 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3469 [20477] network: resolv: incorrect double-checked locking related to
3471 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3473 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3475 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3476 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3477 cause transition penalty
3478 [20517] math: sparcv9 missing fdiml compat symbol
3479 [20524] manual: strverscmp is inconsistent
3480 [20525] libc: <sys/quota.h> should be based on kernel headers
3481 [20539] math: GCC 7 -static -lm fails to link at -O3
3482 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3484 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3486 [20591] network: Remove obsolete DNSSEC support
3487 [20592] network: DNS resource record type classification macros in
3488 <arpa/nameser.h> are incorrect
3489 [20593] network: Update DNS RR type definitions
3490 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3491 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3493 [20629] network: libresolv: Remove support for bitstring labels
3495 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3496 assertion: "maxidx >= 2"
3497 [20660] math: [arm] Use VSQRT
3498 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3499 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3500 [20689] libc: Test for FMA should also check for AVX.
3501 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3502 [20715] math: iszero macro breaks existing code
3503 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3504 [20728] libc: powerpc: Missing TOC stub in clone
3505 [20729] build: glibc-2.24 fails to build for i486 with -Os
3506 [20750] build: Build fails with default PIE enabled gcc-6.x
3507 [20768] math: [alpha] sqrt fegetenv namespace
3508 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3510 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3511 __FLT_EVAL_METHOD__ is 2
3512 [20790] network: rpcgen buffer overrun in get_prog_declaration
3513 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3514 [20829] libc: crypt snprintf namespace
3515 [20847] libc: tst-vfork3 failure
3516 [20855] math: Default bits/mathdef.h has inappropriate float_t
3517 [20859] math: [sh4] FP_ILOGB0 invalid
3518 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3519 U+20AC), not same as GBK
3520 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3521 [20916] math: pow handling of sNaN arguments
3522 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3523 [20919] math: Bad pow (qNaN, 0) result with -lieee
3524 [20940] math: hypot sNaN handling
3525 [20947] math: fmax, fmin sNaN handling
3526 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3527 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3529 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3530 [20973] nptl: robust mutexes: Lost wake-ups
3531 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3532 [20978] nis: strlen on null pointer in nss_nisplus
3533 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3535 [21014] string: i686 memchr overflows internal pointer check
3536 [21019] libc: [mips] n32 lseek incorrect on overflow
3537 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3538 [21026] libc: [MIPS] readahead syscall is broken on n64
3539 [21028] math: Fallback fesetexceptflag should always succeed
3540 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3541 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3543 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3544 [21061] librt: [microblaze] librt lost clock_* exports
3545 [21073] libc: tunables: insecure environment variables passed to
3546 subprocesses with AT_SECURE
3547 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3551 * The minimum Linux kernel version that this version of the GNU C Library
3552 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3553 kernel version 2.6.32 or later suffices (on architectures that already
3554 required kernel versions more recent than 3.2, those requirements remain
3555 unchanged). Linux 3.2 or later kernel headers are required on all
3558 * The pap_AN locale has been deleted. This has been deprecated for a long
3559 time. It has been replaced by pap_AW & pap_CW, both of which have long
3560 been included in previous releases.
3562 * The readdir_r and readdir64_r functions have been deprecated. It is
3563 recommended to use readdir and readdir64 instead.
3565 * The type “union wait” has been removed. It was deprecated in the early
3566 1990s and never part of POSIX. Application code should use the int type
3567 instead of “union wait”.
3569 * A new NSS action is added to facilitate large distributed system
3570 administration. The action, MERGE, allows remote user stores like LDAP
3571 to be merged into local user stores like /etc/groups in order to provide
3572 easy to use, updated, and managed sets of merged credentials. The new
3573 action can be used by configuring it in /etc/nsswitch.conf:
3574 group: files [SUCCESS=merge] nis
3575 Implemented by Stephen Gallagher (Red Hat).
3577 * The deprecated __malloc_initialize_hook variable has been removed from the
3580 * The long unused localedef --old-style option has been removed. It hasn't
3581 done anything in over 16 years. Scripts using this option can safely
3584 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3585 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3586 return the next representable value in the direction of positive infinity
3587 and the nextdown functions return the next representable value in the
3588 direction of negative infinity. These are currently enabled as GNU
3591 Security related changes:
3593 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3594 could result in a stack overflow when getnetbyname was called with an
3595 overly long name. (CVE-2016-3075)
3597 * Previously, getaddrinfo copied large amounts of address data to the stack,
3598 even after the fix for CVE-2013-4458 has been applied, potentially
3599 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3600 instead. Reported by Michael Petlan. (CVE-2016-3706)
3602 * The glob function suffered from a stack-based buffer overflow when it was
3603 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3604 Reported by Alexander Cherepanov. (CVE-2016-1234)
3606 * The Sun RPC UDP client could exhaust all available stack space when
3607 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3608 alloca plugin for GCC. (CVE-2016-4429)
3610 * The IPv6 name server management code in libresolv could result in a memory
3611 leak for each thread which is created, performs a failing naming lookup,
3612 and exits. Over time, this could result in a denial of service due to
3613 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3615 The following bugs are resolved with this release:
3617 [1170] localedata: ne_NP: update Nepali locale definition file
3618 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3620 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3621 [6796] math: fdim() does not set errno on overflow
3622 [10354] libc: posix_spawn should use vfork() in more cases than presently
3623 [11213] localedata: localedata: add copyright disclaimer to locale files
3624 [12143] localedata: chr_US: new Cherokee locale
3625 [12450] localedata: sgs_LT: new locale
3626 [12676] localedata: ln_CD: new locale
3627 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3629 [13304] math: fma, fmaf, fmal produce wrong results
3630 [14259] build: --localedir arg to configure is ignored
3631 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3632 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3633 [14934] localedata: es_CL: wrong first weekday chilean locale
3634 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3636 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3638 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3639 [15368] nptl: raise() is not async-signal-safe
3640 [15479] math: ceil, floor, round and trunc raise inexact exception
3641 [15578] localedata: kk_KZ: various updates
3642 [16003] localedata: pap_AN: punt old locale
3643 [16137] localedata: iw_IL: punt old locale
3644 [16190] localedata: eo: new esperanto locale
3645 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3646 [16742] malloc: race condition: pthread_atfork() called before first
3647 malloc() results in unexpected locking behaviour/deadlocks
3648 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3650 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3651 [17565] localedata: pt_PT: wrong (work-)week start
3652 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3653 [17950] build: Build fails with -msse
3654 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3655 [18433] libc: posix_spawn does not return correctly upon failure to
3657 [18453] localedata: charmaps/IBM875: incorrect codes
3658 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3660 [18896] localedata: he_IL: improvements for currency
3661 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3662 Romanian locale data
3663 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3665 [19056] libc: Deprecate readdir_r
3666 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3668 [19198] localedata: nl_NL: small improvements for Dutch locales
3669 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3670 nameservers (CVE-2016-5417)
3671 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3673 [19400] locale: Language missing in "iso-639.def", trivial fix in
3675 [19431] malloc: Deadlock between fflush, getdelim, and fork
3676 [19505] libc: Incorrect file descriptor validity checks in
3677 posix_spawn_file_actions_add{open,close,dup2}
3678 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3679 when using RTLD_NEXT
3680 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3681 `intl/{gettextP,loadinfo}.h'
3682 [19534] libc: execle, execlp may use malloc
3683 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3684 [19573] network: res_nclose and __res_maybe_init disagree about name
3685 server initialization, breaking Hesiod
3686 [19575] localedata: Status of GB18030 tables
3687 [19581] localedata: sr_* date_fmt string contains additional newline
3688 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3690 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3691 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3692 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3693 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3695 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3697 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3699 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3700 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3701 [19633] locale: strfmon_l applies global locale to number formatting
3702 [19642] network: Memory leak in getnameinfo
3703 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3704 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3706 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3707 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3709 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3710 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3712 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3714 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3716 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3717 pointers and lengths in error-case.
3718 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3719 report errors on UTF-16 surrogates values.
3720 [19755] nscd: nscd assertion failure in gc
3721 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3722 [19759] libc: mempcpy shouldn't be inlined
3723 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3724 [19765] libc: s390 needs an optimized mempcpy
3725 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3726 NAME_MAX limit assumption (CVE-2016-1234)
3727 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3728 [19787] network: Missing and incorrect truncation checks in getnameinfo
3729 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3731 [19791] network: Assertion failure in res_query.c with un-connectable name
3733 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3734 [19822] math: libm.so install clobbers old version
3735 [19825] network: resolv: send_vc can return uninitialized data in second
3736 response to getaddrinfo
3737 [19830] network: nss_dns: should check RDATA length against buffer length
3738 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3739 confronted with A/AAAA records of invalid size
3740 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3741 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3742 [19853] stdio: Printing IBM long double in decimal with high precision is
3744 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3745 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3746 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3748 [19865] network: Assertion failure or memory leak in
3749 _nss_dns_getcanonname_r
3750 [19868] network: nss_dns: netent code does not skip over non-PTR records
3751 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3753 [19881] string: Improve x86-64 memset
3754 [19907] string: Incorrect memcpy tests
3755 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3757 [19925] libc: termios.h XCASE namespace
3758 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3759 [19929] libc: limits.h NL_NMAX namespace
3760 [19931] stdio: Memory leak in vfprintf
3761 [19957] libc: clone(CLONE_VM) access invalid parent memory
3762 [19963] localedata: en_IL: New locale
3763 [19989] stdio: stdio.h cuserid namespace
3764 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3766 [19996] locale: langinfo.h nl_langinfo_l namespace
3767 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3768 [20010] network: getaddrinfo: Stack overflow in hostent translation
3770 [20012] stdio: libio: fmemopen append mode failure
3771 [20014] stdio: stdio.h namespace for pre-threads POSIX
3772 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3773 [20023] libc: fcntl.h timespec namespace
3774 [20024] math: [x86_64] vectorized sincos trashes the stack
3775 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3776 [20041] time: sys/time.h timespec namespace
3777 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3778 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3779 [20051] libc: ttyslot in wrong header under wrong conditions
3780 [20054] libc: gethostname not declared for XPG4
3781 [20055] libc: termios.h missing tcgetsid for XPG4
3782 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3784 [20073] libc: sys/stat.h fchmod namespace
3785 [20074] libc: stdlib.h rand_r namespace
3786 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3787 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3789 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3790 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3792 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3793 [20119] libc: Wrong mask for processors level type from CPUID
3794 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3795 AS not supporting AVX512
3796 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3798 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3799 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3801 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3802 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3803 [20178] libc: posix_spawn{p} should not call exit
3804 [20191] stdio: libio: vtables hardening
3805 [20195] string: FMA4 detection requires CPUID execution with register
3807 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3808 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3810 [20212] math: acos (sNaN) returns sNaN
3811 [20213] math: asin (sNaN) returns sNaN
3812 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3813 [20218] math: [i386] asinhl (sNaN) returns sNaN
3814 [20219] math: [i386] atanhl (sNaN) returns sNaN
3815 [20222] stdio: fopencookie: Mangle function pointers
3816 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3817 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3818 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3820 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3821 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3822 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3823 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3824 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3825 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3826 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3827 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3828 [20240] math: modf (sNaN) returns sNaN
3829 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3830 [20250] math: frexp (sNaN) returns sNaN
3831 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3832 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3834 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3835 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3836 subscript is below array bounds [-Werror=array-bounds]
3837 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3838 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3840 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3841 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3843 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3844 "invalid" exceptions
3845 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3846 [20316] localedata: id_ID: Februari instead of Pebruari
3847 [20327] string: POWER8 strcasecmp returns incorrect result
3848 [20347] math: Failure: Test: j0_downward (0xap+0)
3849 [20348] libc: FAIL: misc/tst-preadvwritev64
3850 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3851 [20350] libc: There is no test for p{read,write}64
3852 [20357] math: Incorrect cos result for 1.5174239687223976
3853 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3857 * Unicode 8.0.0 Support: Character encoding, character type info, and
3858 transliteration tables are all updated to Unicode 8.0.0, using new
3859 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3860 These updates cause user visible changes, such as the fixes for bugs
3861 89, 16061, and 18568.
3863 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3864 kernel-internal CPU set size. This means that requests that change the
3865 CPU affinity which failed before (for example, an all-ones CPU mask) will
3866 now succeed. Applications that need to determine the effective CPU
3867 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3868 setting it because the kernel can adjust it (and the previous size check
3869 would not detect this in the majority of cases).
3871 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3872 the following new symbols are used: fts64_children, fts64_close,
3873 fts64_open, fts64_read and fts64_set.
3875 * getaddrinfo now detects certain invalid responses on an internal netlink
3876 socket. If such responses are received, an affected process will
3877 terminate with an error message of "Unexpected error <number> on netlink
3878 descriptor <number>" or "Unexpected netlink response of size <number> on
3879 descriptor <number>". The most likely cause for these errors is a
3880 multi-threaded application which erroneously closes and reuses the netlink
3881 file descriptor while it is used by getaddrinfo.
3883 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3884 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3885 unnecessary serialization of memory allocation requests across threads.
3886 The defect is now corrected. Users should see a substantial increase in
3887 the concurent throughput of allocation requests for applications which
3888 trigger this bug. Affected applications typically create and
3889 destroy threads frequently. (Bug 19048 was reported and analyzed by
3892 * There is now a --disable-timezone-tools configure option for disabling the
3893 building and installing of the timezone related utilities (zic, zdump, and
3894 tzselect). This is useful for people who build the timezone data and code
3895 independent of the GNU C Library.
3897 * The obsolete header <regexp.h> has been removed. Programs that require
3898 this header must be updated to use <regex.h> instead.
3900 * The obsolete functions bdflush, create_module, get_kernel_syms,
3901 query_module and uselib are no longer available to newly linked binaries;
3902 the header <sys/kdaemon.h> has been removed. These functions and header
3903 were specific to systems using the Linux kernel and could not usefully be
3904 used with the GNU C Library on systems with version 2.6 or later of the
3907 * Optimized string, wcsmbs and memory functions for IBM z13.
3908 Implemented by Stefan Liebler.
3910 * Newly linked programs that define a variable called signgam will no longer
3911 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3912 require signgam to be set by those functions must ensure that they use the
3913 variable provided by the GNU C Library and declared in <math.h>, without
3914 defining their own copy.
3916 * The minimum GCC version that can be used to build this version of the GNU
3917 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3918 still be used to compile programs using the GNU C Library.
3920 Security related changes:
3922 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3923 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3925 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3926 the pointer guard feature. It is always enabled. Previously,
3927 LD_POINTER_GUARD could be used to disable security hardening in binaries
3928 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3931 * An integer overflow in hcreate and hcreate_r could lead to an
3932 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3934 * The catopen function no longer has unbounded stack usage. Reported by
3935 Max. (CVE-2015-8779)
3937 * The nan, nanf and nanl functions no longer have unbounded stack usage
3938 depending on the length of the string passed as an argument to the
3939 functions. Reported by Joseph Myers. (CVE-2014-9761)
3941 * A stack-based buffer overflow was found in libresolv when invoked from
3942 libnss_dns, allowing specially crafted DNS responses to seize control
3943 of execution flow in the DNS client. The buffer overflow occurs in
3944 the functions send_dg (send datagram) and send_vc (send TCP) for the
3945 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3946 family. The use of AF_UNSPEC triggers the low-level resolver code to
3947 send out two parallel queries for A and AAAA. A mismanagement of the
3948 buffers used for those queries could result in the response of a query
3949 writing beyond the alloca allocated buffer created by
3950 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3951 the overflow. Thanks to the Google Security Team and Red Hat for
3952 reporting the security impact of this issue, and Robert Holiday of
3953 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3955 The following bugs are resolved with this release:
3957 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3958 [887] math: Math library function "logb" and "nextafter" inconsistent
3959 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3960 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3961 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3962 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3964 [4404] localedata: German translation of "Alarm clock" is misleading
3965 [6799] math: nextafter() and nexttoward() doen't set errno on
3966 overflow/underflow errors
3967 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3969 [10432] nis: _nss_nis_setnetgrent assertion failure
3970 [11460] libc: fts has no LFS support
3971 [12926] network: getaddrinfo()/make_request() may spin forever
3972 [13065] nptl: Race condition in pthread barriers
3973 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3974 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3976 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3977 [14912] libc: Rename non-installed bits/*.h headers
3978 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3979 [15367] math: Let gcc use __builtin_isinf
3980 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3981 [15421] math: lgamma wrongly sets signgam for ISO C
3982 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3983 FE_INVALID with argument out of range
3984 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3986 [15786] dynamic-link: ifunc resolver functions can smash function
3988 [15918] math: Unnecessary check for equality in hypotf()
3989 [16061] localedata: Review / update transliteration data
3990 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3992 [16141] time: strptime %z offset restriction
3993 [16171] math: drem should be alias of remainder
3994 [16296] math: fegetround is pure?
3995 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3996 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3998 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3999 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4001 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4002 "Exception "Inexact" set" on ppc32
4003 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4004 [16517] math: Missing underflow exception from tanf/tan/tanl
4005 [16519] math: Missing underflow exception from sinhf
4006 [16520] math: Missing underflow exception from tanhf
4007 [16521] math: Missing underflow exception from exp2
4008 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4010 [16734] stdio: fopen calls mmap to allocate its buffer
4011 [16961] math: nan function incorrect handling of bad sequences
4012 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4013 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4014 [16985] locale: localedef: confusing error message when opening output
4016 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4017 [17197] locale: Redundant shift character in iconv conversion output at
4019 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4020 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4021 [17250] dynamic-link: static linking breaks nss loading
4022 (getaddrinfo/getpwnam/etc...)
4023 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4025 [17441] math: isnan() should use __builtin_isnan() in GCC
4026 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4027 (related to lock elision)
4028 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4029 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4030 [17887] time: strptime should be able to parse "+01:00" style timezones
4031 [17905] libc: catopen() Multiple unbounded stack allocations
4033 [18084] libc: backtrace (..., 0) dumps core on x86
4034 [18086] libc: nice() sets errno to 0 on success
4035 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4036 is too large (CVE-2015-8778)
4037 [18251] dynamic-link: SONAME missing when audit modules provides path
4038 [18265] libc: add attributes for wchar string and memory functions
4039 [18370] math: csqrt missing underflows
4040 [18421] libc: [hppa] read-only segment has dynamic relocations
4041 [18472] libc: Obsolete syscall wrappers should be compat symbols
4042 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4043 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4044 [18525] localedata: Remove locale timezone information
4045 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4046 [18568] localedata: Update locale data to Unicode 8.0
4047 [18589] locale: sort-test.sh fails at random
4048 [18595] math: ctan, ctanh missing underflows
4049 [18604] libc: assert macro-expands its argument
4050 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4051 contains a vector instruction exception.
4052 [18611] math: j1, jn missing errno setting on underflow
4053 [18618] localedata: sync Chechen locale definitions with other *_RU
4055 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4056 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4057 [18665] network: In send_dg, the recvfrom function is NOT always using the
4058 buffer size of a newly created buffer (CVE-2015-7547)
4059 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4061 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4063 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4064 [18699] math: tilegx cproj() for various complex infinities does not yield
4066 [18724] libc: Harden put*ent functions against data injection
4067 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4068 [18755] build: build errors with -DNDEBUG
4069 [18757] stdio: fmemopen fails to set errno on failure
4070 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4072 [18781] libc: openat64 lacks O_LARGEFILE
4073 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4074 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4075 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4076 [18790] math: [ldbl-128ibm] tanhl inaccurate
4077 [18795] libc: stpncpy fortification misses buffer lengths that are
4078 statically too large
4079 [18796] build: build fails for --disable-mathvec
4080 [18803] math: hypot missing underflows
4081 [18820] stdio: fmemopen may leak memory on failure
4082 [18823] math: csqrt spurious underflows
4083 [18824] math: fma spurious underflows
4084 [18825] math: pow missing underflows
4085 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4086 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4087 [18870] build: sem_open.c fails to compile with missing symbol
4089 [18872] stdio: Fix memory leak in printf_positional
4090 [18873] libc: posix_fallocate overflow check ineffective
4091 [18875] math: Excess precision leads incorrect libm
4092 [18877] libc: arm: mmap offset regression
4093 [18887] libc: memory corruption when using getmntent on blank lines
4094 [18918] localedata: hu_HU: change time to HH:MM:SS format
4095 [18921] libc: Regression: extraneous stat() and fstat() performed by
4097 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4098 binaries (CVE-2015-8777)
4099 [18951] math: tgamma missing underflows
4100 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4102 [18953] localedata: lt_LT: change currency symbol to the euro
4103 [18956] math: powf inaccuracy
4104 [18961] math: [i386] exp missing underflows
4105 [18966] math: [i386] exp10 missing underflows
4106 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4107 [18969] build: multiple string test failures due to missing locale
4109 [18970] libc: Reference of pthread_setcancelstate in libc.a
4110 [18977] math: float / long double Bessel functions not in XSI POSIX
4111 [18980] math: i386 libm functions return with excess range and precision
4112 [18981] math: i386 scalb*, ldexp return with excess range and precision
4113 [18982] stdio: va_list and vprintf
4114 [18985] time: Passing out of range data to strftime() causes a segfault
4116 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4117 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4118 [19012] locale: iconv_open leaks memory on error path
4119 [19016] math: clog, clog10 inaccuracy
4120 [19018] nptl: Mangle function pointers in tls_dtor_list
4121 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4122 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4123 [19048] malloc: malloc: arena free list can become cyclic, increasing
4125 [19049] math: [powerpc] erfc incorrect zero sign
4126 [19050] math: [powerpc] log* incorrect zero sign
4127 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4128 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4129 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4130 [19074] network: Data race in _res_hconf_reorder_addrs
4131 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4132 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4133 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4135 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4137 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4138 [19086] manual: posix_fallocate64 documented argument order is wrong.
4139 [19088] math: lround, llround missing exceptions close to overflow
4141 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4142 [19095] math: dbl-64 lrint incorrect for 64-bit long
4143 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4144 [19124] dynamic-link: ld.so failed to build with older assmebler
4145 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4146 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4147 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4148 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4149 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4150 pthread_setaffinity_np
4151 [19156] math: [ldbl-128] j0l spurious underflows
4152 [19164] nptl: tst-getcpu fails with many possible CPUs
4153 [19168] math: math/test-ildoubl and math/test-ldouble failure
4154 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4155 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4157 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4158 (FE_NOMASK_ENV) do not clear SSE exceptions
4159 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4160 _int_new_arena/reused_arena
4161 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4162 [19201] math: dbl-64 remainder incorrect sign of zero result
4163 [19205] math: bits/math-finite.h conditions do not match math.h and
4165 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4166 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4167 for C99-based standards
4168 [19212] libc: features.h not -Wundef clean
4169 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4171 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4172 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4173 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4175 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4176 "inexact" exceptions
4177 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4179 [19242] libc: strtol incorrect in Turkish locales
4180 [19243] malloc: reused_arena can pick an arena on the free list, leading
4181 to an assertion failure and reference count corruption
4182 [19253] time: tzset() ineffective when temporary TZ did not include DST
4184 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4185 [19270] math: [hppa] Shared libm missing __isnanl
4186 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4187 MAP_HUGETLB and MAP_STACK defines
4188 [19313] nptl: Wrong __cpu_mask for x32
4189 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4190 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4191 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4192 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4193 [19363] time: x32: times() return value wrongly truncates/sign extends
4195 [19367] dynamic-link: Improve branch prediction on Silvermont
4196 [19369] network: Default domain name not reset by res_ninit when "search"
4197 / "domain" entry is removed from resolv.conf
4198 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4200 [19385] localedata: bg_BG: time separator should be colon, not comma
4201 [19408] libc: linux personality syscall wrapper may erroneously return an
4202 error on 32-bit architectures
4203 [19415] libc: dladdr returns wrong names on hppa
4204 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4205 IBM905, IBM907, and IBM909
4206 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4207 [19443] build: build failures with -DDEBUG
4208 [19451] build: Make check fails on test-double-vlen2
4209 [19462] libc: Glibc failed to build with -Os
4210 [19465] math: Wrong code with -Os
4211 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4213 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4215 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4216 [19486] math: S390: Math tests fail with "Exception Inexact set".
4217 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4218 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4220 [19590] math: Fail to build shared objects that use libmvec.so functions.
4224 * The following bugs are resolved with this release:
4226 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4227 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4228 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4229 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4230 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4231 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4232 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4233 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4234 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4235 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4236 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4237 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4238 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4239 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4240 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4241 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4242 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4243 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4244 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4245 18657, 18676, 18694, 18696, 18887.
4247 * Cache information can be queried via sysconf() function on s390 e.g. with
4248 _SC_LEVEL1_ICACHE_SIZE as argument.
4250 * A buffer overflow in gethostbyname_r and related functions performing DNS
4251 requests has been fixed. If the NSS functions were called with a
4252 misaligned buffer, the buffer length change due to pointer alignment was
4253 not taken into account. This could result in application crashes or,
4254 potentially arbitrary code execution, using crafted, but syntactically
4255 valid DNS responses. (CVE-2015-1781)
4257 * The time zone file parser has been made more robust against crafted time
4258 zone files, avoiding heap buffer overflows related to the processing of
4259 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4260 large time zone data files. Overly long time zone specifiers in the TZ
4261 variable no longer result in stack overflows and crashes.
4263 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4264 for LD and GD on x86 and x86-64, has been implemented. You will need
4265 binutils-2.24 or later to enable this optimization.
4267 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4268 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4269 Hat). These updates cause user visible changes, such as the fix for bug
4272 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4273 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4274 condition in some applications.
4276 * Added vector math library named libmvec with the following vectorized x86_64
4277 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4279 The library can be disabled with --disable-mathvec. Use of the functions is
4280 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4281 Shared library libmvec.so is linked in as needed when using -lm (no need to
4282 specify -lmvec explicitly for not static builds).
4283 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4285 * A new fmemopen implementation has been added with the goal of POSIX
4286 compliance. The new implementation fixes the following long-standing
4287 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4288 old implementation is still present for use be by existing binaries.
4290 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4291 releases. It has been fixed to match 2.19 and older, but binaries built
4292 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4294 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4295 Contributed by Roland McGrath (Google).
4297 * The header <regexp.h> is deprecated, and will be removed in a future
4298 release. Use of this header will trigger a deprecation warning.
4299 Application developers should update their code to use <regex.h> instead.
4301 This header was formerly part of SUS, but was deprecated in 1994 and
4302 removed from the standard in 2001. Also, the glibc implementation
4303 leaks memory. See BZ#18681 for more details.
4307 * The following bugs are resolved with this release:
4309 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4310 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4311 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4312 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4313 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4314 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4315 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4316 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4317 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4318 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4321 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4322 too little memory for the to-be-scanned arguments and overflow the
4323 allocated buffer. The implementation now correctly computes the required
4324 buffer size when using malloc, and switches to malloc from alloca as
4327 * A new semaphore algorithm has been implemented in generic C code for all
4328 machines. Previous custom assembly implementations of semaphore were
4329 difficult to reason about or ensure that they were safe. The new version
4330 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4331 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4332 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4334 * Port to Altera Nios II has been contributed by Mentor Graphics.
4336 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4337 implementations for powerpc64/powerpc64le.
4338 Implemented by Adhemerval Zanella (IBM).
4340 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4341 and powerpc64le. This may improve lock scaling of existing programs on
4342 HTM capable systems. The lock elision code is only enabled with
4343 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4344 powerpc will issue a transaction abort on every syscall to avoid side
4345 effects being visible outside transactions.
4347 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4348 AArch64. Contributed by ARM Ltd.
4350 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4352 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4353 under certain input conditions resulting in the execution of a shell for
4354 command substitution when the application did not request it. The
4355 implementation now checks WRDE_NOCMD immediately before executing the
4356 shell and returns the error WRDE_CMDSUB as expected.
4358 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4359 processing format strings with a large number of format specifiers.
4361 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4362 infinite loop if the DNS response contained a PTR record of an unexpected
4365 * The minimum GCC version that can be used to build this version of the GNU
4366 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4367 still be used to compile programs using the GNU C Library.
4369 * The GNU C Library is now built with -Werror by default. This can be
4370 disabled by configuring with --disable-werror.
4372 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4374 * The obsolete sigvec function has been removed. This was the original
4375 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4376 programs have been using instead for about 25 years. Of course, ABI
4377 compatibility for old binaries using sigvec remains intact.
4379 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4380 with newer versions of bison.
4382 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4383 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4384 registers overlay two consecutive single-precision registers. MIPS32R2
4385 introduced a new FPU mode (FR=1) where double-precision registers extend the
4386 corresponding single-precision registers which is incompatible with the
4387 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4388 require the use of FR=1 making a transition necessary. New o32 ABI
4389 extensions enable users to migrate over time from the original o32 ABI
4390 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4391 tracks the ABI of any loaded object and verifies that new objects are
4392 compatible. Mode transitions will also be requested as required and
4393 unsupportable objects will be rejected. The ABI checks include both soft and
4394 hard float ABIs for o32, n32 and n64.
4396 GCC 5 with GNU binutils 2.25 onwards:
4397 It is strongly recommended that all o32 system libraries are built using the
4398 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4399 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4400 compiler using --with-fp-32=xx to set this by default.
4404 * The following bugs are resolved with this release:
4406 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4407 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4408 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4409 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4410 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4411 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4412 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4413 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4414 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4415 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4416 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4417 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4418 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4419 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4420 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4422 * Reverted change of ABI data structures for s390 and s390x:
4423 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4424 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4425 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4426 are preserved pointing straight to the same implementation as the old ones.
4427 Given that, new callers will simply provide a too-big buffer to these
4428 functions. Any applications/libraries out there that embed jmp_buf or
4429 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4430 against 2.19 headers will have to rebuilt again. This is necessary in any
4431 case to revert the breakage in their ABI caused by the glibc change.
4433 * Support for file description locks is added to systems running the
4434 Linux kernel. The standard file locking interfaces are extended to
4435 operate on file descriptions, not file descriptors, via the use of
4436 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4437 are associated with an open file instead of a process.
4439 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4441 * The minimum Linux kernel version that this version of the GNU C Library
4442 can be used with is 2.6.32.
4444 * Running the testsuite no longer terminates as soon as a test fails.
4445 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4446 with PASS or FAIL lines for individual tests. A summary of the results is
4447 printed, including a list of failing lists, and "make check" exits with
4448 error status if there were any unexpected failures. "make check
4449 stop-on-test-failure=y" may be used to keep the old behavior.
4451 * The am33 port, which had not worked for several years, has been removed
4454 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4455 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4456 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4457 conflicted with POSIX (support for which was removed in 2.19), the
4458 interfaces those macros enabled remain available when compiling with
4459 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4460 test macros defined.
4462 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4464 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4465 This may improve lock scaling of existing programs on TX capable systems.
4466 The lock elision code is only built with --enable-lock-elision=yes and
4467 then requires a GCC version supporting the TX builtins. With lock elision
4468 default mutexes are elided via __builtin_tbegin, if the cpu supports
4469 transactions. By default lock elision is not enabled and the elision code
4472 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4473 copy the path argument. This allowed programs to cause posix_spawn to
4474 deference a dangling pointer, or use an unexpected pathname argument if
4475 the string was modified after the posix_spawn_file_actions_addopen
4478 * All supported architectures now use the main glibc sysdeps directory
4479 instead of some being in a separate "ports" directory (which was
4480 distributed separately before glibc 2.17).
4482 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4483 On configurations that support it (all Linux configurations), it's now
4484 used regardless of the --enable-add-ons switch to configure. It is no
4485 longer possible to build such configurations without pthreads support.
4487 * Locale names, including those obtained from environment variables (LANG
4488 and the LC_* variables), are more tightly checked for proper syntax.
4489 setlocale will now fail (with EINVAL) for locale names that are overly
4490 long, contain slashes without starting with a slash, or contain ".." path
4491 components. (CVE-2014-0475) Previously, some valid locale names were
4492 silently replaced with the "C" locale when running in AT_SECURE mode
4493 (e.g., in a SUID program). This is no longer necessary because of the
4496 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4497 with application code using Intel MPX instructions. (With all previous
4498 versions, the MPX register state could be clobbered when making calls
4499 into or out of a shared library.) Note that while the new dynamic
4500 linker is compatible with all known x86 hardware whether or not it
4501 supports Intel MPX, some x86 instruction-set emulators might fail to
4502 handle the new instruction encodings. This is known to affect Valgrind
4503 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4504 release), and might affect other tools that do instruction emulation.
4506 * Support for loadable gconv transliteration modules has been removed.
4507 The support for transliteration modules has been non-functional for
4508 over a decade, and the removal is prompted by security defects. The
4509 normal gconv conversion modules are still supported. Transliteration
4510 with //TRANSLIT is still possible, and the //IGNORE specifier
4511 continues to be supported. (CVE-2014-5119)
4513 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4514 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4515 resulting a denial-of-service security vulnerability in applications which
4516 use functions related to iconv. (CVE-2014-6040)
4520 * The following bugs are resolved with this release:
4522 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4523 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4524 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4525 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4526 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4527 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4528 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4529 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4530 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4531 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4532 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4533 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4534 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4535 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4536 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4537 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4538 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4539 16431, 16453, 16474, 16506, 16510, 16529
4541 * Slovenian translations for glibc messages have been contributed by the
4542 Translation Project's Slovenian team of translators.
4544 * The public headers no longer use __unused nor __block. This change is to
4545 support compiling programs that are derived from BSD sources and use
4546 __unused internally, and to support compiling with Clang's -fblock
4547 extension which uses __block.
4549 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4550 large collation sequences to optimize multiple passes. This cache
4551 computation may overflow for large collation sequences and may cause a
4552 stack or buffer overflow. This is now fixed to use a slower algorithm
4553 which does not use a cache if there is an integer overflow.
4555 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4556 rules for large collation sequences to optimize multiple passes and falls
4557 back to alloca if malloc fails, resulting in a possible stack overflow.
4558 The implementation now falls back to an uncached collation sequence lookup
4561 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4562 initialized for static applications resulting in the security feature
4563 being disabled. The pointer guard is now correctly initialized to a
4564 random value for static applications. Existing static applications need
4565 to be recompiled to take advantage of the fix (bug 15754).
4567 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4568 to the d_name member of struct dirent, or omit the terminating NUL
4569 character. (Bugzilla #14699).
4571 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4572 aligned_alloc functions could allocate too few bytes or corrupt the
4573 heap when passed very large allocation size values (Bugzilla #15855,
4576 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4577 for AF_INET6 has been fixed (Bugzilla #16072).
4579 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4580 pap_CW, quz_PE, the_NP.
4582 * Substantially revised locales: gd_GB, ht_HT
4584 * The LC_ADDRESS field was updated to support country_car for almost all
4587 * ISO 1427 definitions were updated.
4589 * ISO 3166 definitions were updated.
4591 * The localedef utility now supports --big-endian and --little-endian
4592 command-line options to generate locales for a different system from that
4593 for which the C library was built.
4595 * Binary locale files now only depend on the endianness of the system for
4596 which they are generated and not on other properties of that system. As a
4597 consequence, binary files generated with new localedef may be incompatible
4598 with old versions of the GNU C Library, and binary files generated with
4599 old localedef may be incompatible with this version of the GNU C Library,
4600 in the following circumstances:
4602 + Locale files may be incompatible on m68k systems.
4604 + Locale archive files (but not separate files for individual locales) may
4605 be incompatible on systems where plain "char" is signed.
4607 * The configure option --disable-versioning has been removed. Builds with
4608 --disable-versioning had not worked for several years.
4610 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4611 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4613 * SystemTap probes for malloc have been introduced.
4615 * SystemTap probes for slow multiple precision fallback paths of
4616 transcendental functions have been introduced.
4618 * Support for powerpc64le has been added.
4620 * The soft-float powerpc port now supports e500 processors.
4622 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4624 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4625 set of header declarations that are enabled by default, even when other
4626 feature test macros or compiler options such as -std=c99 would otherwise
4627 disable some of those declarations.
4629 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4630 conflict with POSIX. The libbsd-compat library (which was a dummy library
4631 that did nothing) has also been removed.
4633 * Preliminary documentation about Multi-Thread, Async-Signal and
4634 Async-Cancel Safety has been added.
4636 * Change of ABI data structures for s390 and s390x:
4637 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4638 allow for future hardware extensions. All library functions that accept or
4639 return these structures were versioned in order to provide backwards
4640 compatibility with existing code. However, not all cases can be handled
4641 with interface versioning. If an application embeds either structure into
4642 another structure and that structure is passed to another compilation unit
4643 which expects the newer larger-sized object then any access to the new
4644 fields will result in undefined behaviour. Similarly any access to fields
4645 that were moved by the enlarging of the structures will cause undefined
4646 behaviour. To fix the undefined behaviour all objects that are part of the
4647 final in-memory image must agree on the size of structures, and this may
4648 require recompilation.
4652 * The following bugs are resolved with this release:
4654 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4655 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4656 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4657 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4658 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4659 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4660 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4661 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4662 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4663 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4664 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4665 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4666 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4669 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4670 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4671 Distributions can re-enable building and using pt_chown via the new configure
4672 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4673 considerable security risks and should only be used if the distribution
4674 understands and accepts the risks.
4676 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4679 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4680 fixed (Bugzilla #15330).
4682 * Add support for calling C++11 thread_local object destructors on thread
4683 and program exit. This needs compiler support for offloading C++11
4684 destructor calls to glibc.
4686 * Improved worst case performance of libm functions with double inputs and
4689 * Support for priority inherited mutexes in pthread condition variables on
4690 non-x86 architectures.
4692 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4694 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4696 * Optimized string functions for ARM. Implemented by Will Newton and
4699 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4701 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4704 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4705 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4707 * Added a benchmark framework to track performance of functions in glibc.
4709 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4710 It is based on draft TS 18661 and currently enabled as a GNU extension.
4712 * On Linux, the clock function now uses the clock_gettime system call
4713 for improved precision, rather than old times system call.
4715 * Added support for version-3 tz format files. This is needed when using
4716 the tz database release 2013e or later, and affects a few unusual cases --
4717 currently only TZ='America/Godthab' for time stamps after 2037.
4719 * Added new API functions pthread_getattr_default_np and
4720 pthread_setattr_default_np to get and set the default pthread
4721 attributes of a process.
4723 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4724 This may improve lock scaling of existing programs on TSX capable systems.
4725 When the --enable-lock-elision=yes parameter is specified at configure
4726 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4729 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4730 availability). Implemented by Ryan S. Arnold.
4732 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4736 * The following bugs are resolved with this release:
4738 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4739 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4740 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4741 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4742 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4743 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4744 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4745 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4746 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4747 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4748 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4749 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4750 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4751 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4752 14879, 14889, 14893, 14898, 14914.
4754 * Optimization of memcpy for MIPS.
4756 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4757 EMFILE has been fixed (Bugzilla #14889).
4759 * The add-on ports collection is now distributed in the "ports" subdirectory
4760 of the main GNU C Library distribution, rather than separately.
4762 * Port to ARM AArch64 contributed by Linaro.
4764 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4765 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4767 Implemented by Andreas Krebbel.
4769 * The new function secure_getenv allows secure access to the environment,
4770 returning NULL if running in a SUID/SGID process. This function replaces
4771 the internal function __secure_getenv.
4773 * SystemTap static probes have been added into the dynamic linker.
4774 Implemented by Gary Benson.
4776 * Optimizations of string functions strstr, strcasestr and memmem.
4777 Implemented by Maxim Kuvyrkov.
4779 * The minimum Linux kernel version that this version of the GNU C Library
4780 can be used with is 2.6.16.
4782 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4783 powerpc POWER7. Implemented by Will Schmidt.
4785 * New configure option --disable-nscd builds the C library such that it
4786 never attempts to contact the Name Service Caching Daemon (nscd).
4787 New configure option --disable-build-nscd avoids building nscd itself;
4788 this is the default if --disable-nscd is used.
4790 * Improved support for cross-compilation, including cross-testing and
4791 bootstrap builds without a previously built glibc.
4793 * Several testsuite tests are now able to test multiple IFUNC variants of an
4794 interface, rather than just testing the one that would be chooen by
4797 * New configure options --with-bugurl and --with-pkgversion, for
4798 distributors to use to embed their bug-reporting and package version
4799 information in --help and --version output.
4801 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4802 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4803 allows creation of chroots without the procfs mounted on /proc.
4805 * The `crypt' function now fails if passed salt bytes that violate the
4806 specification for those values. On Linux, the `crypt' function will
4807 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4808 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4809 when the mode is enabled.
4811 * The `clock_*' suite of functions (declared in <time.h>) is now available
4812 directly in the main C library. Previously it was necessary to link with
4813 -lrt to use these functions. This change has the effect that a
4814 single-threaded program that uses a function such as `clock_gettime' (and
4815 is not linked with -lrt) will no longer implicitly load the pthreads
4816 library at runtime and so will not suffer the overheads associated with
4817 multi-thread support in other code such as the C++ runtime library.
4819 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4824 * The following bugs are resolved with this release:
4826 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4827 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4828 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4829 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4830 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4831 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4832 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4833 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4834 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4835 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4836 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4837 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4838 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4839 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4840 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4841 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4842 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4843 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4844 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4845 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4846 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4847 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4850 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4851 configuring glibc with:
4852 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4853 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4854 Implemented by H.J. Lu.
4858 + define static_assert
4860 + do not declare gets
4862 + declare at_quick_exit and quick_exit also for ISO C11
4864 + aligned_alloc. NB: The code is deliberately allows the size parameter
4865 to not be a multiple of the alignment. This is a moronic requirement
4866 in the standard but it is only a requirement on the caller, not the
4869 + timespec_get added
4871 + uchar.h support added
4873 + CMPLX, CMPLXF, CMPLXL added
4875 Implemented by Ulrich Drepper.
4877 * Support for the IA-64 has been moved to ports.
4879 * Remove support for anything but ELF binary format
4881 * Checking versions of poll, ppoll added.
4882 Implemented by Ulrich Drepper.
4884 * More generic and 64-bit performance optimizations to math functions.
4885 Implemented by Ulrich Drepper.
4887 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4888 headers and functions available at compile time as they were before
4889 version 2.14. This option will be removed at some time in the future
4890 after the TI-RPC library becomes fully sufficient for the needs of
4891 existing applications.
4893 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4894 Note that glibc is not expected to work with any Linux kernel version
4897 * New header <sys/auxv.h> and function getauxval allowing easy access to
4898 the AT_* key-value pairs passed from the Linux kernel. The header also
4899 defines the HWCAP_* bits associated with the AT_HWCAP key.
4901 * New locales: mag_IN
4903 * New configure option --enable-systemtap builds SystemTap static probes
4904 into libc for setjmp and longjmp and into libpthread for various operations.
4905 So far the setjmp/longjmp probes and some of the libpthread probes are
4906 provided only for i*86 and x86_64.
4907 Implemented by Roland McGrath and Rayson Ho.
4909 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4911 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4914 * More optimized functions for SPARC. Implemented by David S. Miller.
4916 * Improved support for cross-compilation, especially bootstrap builds
4917 without a previously built glibc.
4919 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4920 Chris Metcalf from Tilera.
4922 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4923 now supported for ARM processors.
4925 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4926 as the name of the dynamic linker, to distinguish it from the
4927 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4929 * Support for CRIS has been removed from ports.
4931 * A new class of installed header has been documented for low-level
4932 platform-specific functionality. PowerPC added the first instance with a
4933 function to provide time base register access. Contributed by Tulio
4934 Magno Quites Machado Filho.
4936 * ix86 configurations now install header files that are consistent with
4937 what x86-64 configurations install. These same header files can be used
4938 for -m32, -m64, or -mx32 builds.
4939 Contributed by H.J. Lu.
4941 * Math library bug fixes. A thorough audit of all open math library bugs was
4942 conducted by Joseph Myers. Significant progress was made on many math
4943 library bugs resulting in more accurate exceptions and function results.
4944 Many thanks to all those that contributed including Andreas Jaeger for his
4945 patch review and work on the x87 trigonometric instruction issues.
4947 * Timezone data is no longer installed. Timezone-related binaries and scripts
4948 will continue to be installed. Users should obtain their timezone data from
4949 their distribution provider or from the tzdata package at
4950 <ftp://munnari.oz.au/pub/>.
4954 * The following bugs are resolved with this release:
4956 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4957 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4958 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4959 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4960 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4961 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4962 13484, 13506, 13515, 13523, 13524, 13538, 13540
4964 * New program pldd to list loaded object of a process
4965 Implemented by Ulrich Drepper.
4967 * Add nss_db support back to glibc. No more dependency on Berkeley db
4968 and support for initgroups lookups.
4969 Implemented by Ulrich Drepper.
4971 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4972 Contributed by HJ Lu.
4974 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4975 Contributed by HJ Lu.
4977 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4978 on x86-32 and x86-64.
4979 Contributed by Liubov Dmitrieva.
4981 * Optimized strchr and strrchr for SSE on x86-32.
4982 Contributed by Liubov Dmitrieva.
4984 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4985 for x86-64 and x86-32.
4986 Contributed by Liubov Dmitrieva.
4988 * New interfaces: scandirat, scandirat64
4989 Implemented by Ulrich Drepper.
4991 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4992 Implemented by Ulrich Drepper.
4994 * nscd now also caches the netgroup database.
4995 Implemented by Ulrich Drepper.
4997 * Integrate libm with gcc's -ffinite-math-only option.
4998 Implemented by Ulrich Drepper.
5000 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5001 to math functions. Implemented by Ulrich Drepper.
5003 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5004 Implemented by Ulrich Drepper.
5006 * New Linux interfaces: process_vm_readv, process_vm_writev
5008 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5009 Implemented by Ulrich Drepper.
5011 * Optimized nearbyint and strcasecmp for PPC.
5012 Implemented by Adhemerval Zanella.
5014 * New locales: bho_IN, unm_US, es_CU, ta_LK
5018 * The following bugs are resolved with this release:
5020 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5021 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5022 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5023 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5024 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5025 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5026 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5027 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5028 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5029 12795, 12811, 12813, 12814, 12841
5031 * The RPC implementation in libc is obsoleted. Old programs keep working
5032 but new programs cannot be linked with the routines in libc anymore.
5033 Programs in need of RPC functionality must be linked against TI-RPC.
5034 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5036 Visible changes of this change include (obviously) the inability to link
5037 programs using RPC functions without referencing the TI-RPC library and the
5038 removal of the RPC headers from the glibc headers.
5039 Implemented by Ulrich Drepper.
5041 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5042 syncfs, setns, sendmmsg
5044 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5045 yue_HK, lij_IT, mhr_RU
5047 * New encodings: CP770, CP771, CP772, CP773, CP774
5049 * New program sotruss to trace calls through PLTs
5050 Implemented by Ulrich Drepper.
5052 * The malloc hook implementation is marked deprecated and will be removed
5053 from the default implementation in the next version. The design never
5054 worked ever since the introduction of threads. Even programs which do
5055 not create threads themselves can use multiple threads created internally.
5059 * The following bugs are resolved with this release:
5061 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5062 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5063 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5064 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5067 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5069 * POWER7 optimizations: memset, memcmp, strncmp
5071 * New optimized string functions for x86-64: strnlen (SSE2),
5072 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5073 Implemented by Ulrich Drepper.
5077 * The following bugs are resolved with this release:
5079 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5080 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5081 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5082 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5083 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5084 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5085 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5086 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5088 * New interfaces: pthread_getname_np, pthread_setname_np
5090 * New Linux interface: recvmmsg
5092 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5094 * The dynamic linker now recognizes supported ABI versions from the
5095 EI_ABIVERSION field in the ELF header.
5096 Implemented by Ulrich Drepper.
5098 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5099 will not be used to fill in password fields in the passwd.byname replies.
5100 Instead it is used to synthesize the shadow.byname table, should it be
5101 missing. This is a useful mode in some installations involving Solaris.
5102 Implemented by Ulrich Drepper.
5104 * New locales: kok_IN, sq_MK, cv_RU
5108 * The following bugs are resolved with this release:
5110 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5111 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5112 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5113 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5114 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5115 10789, 10817, 10823, 10840, 10847
5117 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5119 Implemented by Ulrich Drepper.
5121 * Checking version of longjmp added that fails if an uninitialized stack
5122 frame would be created. Implemented by Ulrich Drepper.
5124 * STT_GNU_IFUNC is now supported in static executables.
5125 Implemented by H.J. Lu.
5127 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5129 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5130 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5131 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5132 Contributed by H.J. Lu.
5134 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5135 Implemented by Ulrich Drepper.
5137 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5139 Contributed by H.J. Lu.
5141 * Support for fma instruction in AVX on x86-64.
5142 Implemented by H.J. Lu and Ulrich Drepper.
5144 * AVX support in x86-64 auditing support in ld.so.
5145 Implemented by H.J. Lu.
5147 * STB_GNU_UNIQUE support added.
5148 Implemented by Ulrich Drepper.
5150 * Implement second fallback mode for optimized DNS lookup for even more
5151 broken environments. If two requests from the same port are not
5152 handled correctly close the socket and open a new one before sending
5153 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5154 can be used to select this mode right away, instead of rediscovering the
5155 necessity is every process again.
5156 Implemented by Ulrich Drepper.
5158 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5159 Implemented by Adam Tkac.
5161 * Optimized iconv conversions for S390x.
5162 Implemented by Andreas Krebbel.
5164 * Using condvars with PI mutexes is now more efficient due to kernel
5165 support for requeueing to PI futexes. NPTL support added for x86-64.
5166 Implemented by Ulrich Drepper.
5168 * New locales: ps_AF, my_MM
5172 * The following bugs are resolved with this release:
5174 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5175 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5176 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5177 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5178 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5180 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5181 Implemented by Ulrich Drepper.
5183 * New Linux interfaces: accept4, fallocate, fallocate64.
5184 Implemented by Ulrich Drepper.
5186 * Correct declarations of string function when used in C++ code. This
5187 could lead to compile errors for invalid C++ code.
5189 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5192 * New POSIX 2008 interface: psiginfo
5193 Implemented by Ulrich Drepper.
5195 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5196 Implemented by Ulrich Drepper.
5198 * Support for selecting between multiple function definitions at runtime
5199 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5201 * The libcrypt library can now use the hash function implementations in
5202 NSS. Implemented by Ulrich Drepper.
5204 * The malloc implementation can be compiled to be less memory efficient
5205 but higher performing in multi-threaded programs.
5206 Implemented by Ulrich Drepper.
5208 * New locales: nan_TW@latin, ks_IN
5210 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5211 Implemented by Ulrich Drepper.
5213 * Extended printf hook support. It is possible to use user-defined types
5214 and extend existing format specifiers.
5215 Implemented by Ulrich Drepper.
5217 * Handling for group shadow files has been added.
5218 Implemented by Ulrich Drepper.
5220 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5221 servers (the case, e.g., for some people using the built-in DNS
5222 server in ADSL modems/routers). There is a once-per-process timeout
5223 in case of a broken server. To avoid it, users can run nscd or put
5224 'options single-request' in /etc/resolv.conf.
5225 Implemented by Ulrich Drepper.
5229 * The following bugs are resolved with this release:
5231 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5232 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5233 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5234 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5235 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5237 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5238 up at the same time. Implemented by Ulrich Drepper.
5240 * TLS descriptors for LD and GD on x86 and x86-64.
5241 Implemented by Alexandre Oliva.
5243 * getaddrinfo now handles DCCP and UDPlite.
5244 Implemented by Ulrich Drepper.
5246 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5247 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5248 Implemented by Ulrich Drepper.
5250 * New implementation of memmem, strstr, and strcasestr which is O(n).
5251 Implemented by Eric Blake.
5253 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5255 * Implement "e" option for popen to open file descriptor with the
5256 close-on-exec flag set. Implemented by Ulrich Drepper.
5258 * Implement "b" mode for fmemopen. In this mode writes writes don't
5259 implicitly add a NUL byte and seeks from the end of the buffer really
5260 use the buffer end, not the string length as the basis.
5261 Implemented by Ulrich Drepper.
5263 * Many functions, exported and internal, now atomically set the close-on-exec
5264 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5266 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5268 Implemented by Pravin Satpute.
5270 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5274 * The following bugs are resolved with this release:
5276 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5277 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5278 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5279 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5280 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5281 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5282 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5284 * New locales: bo_CN, bo_IN, shs_CA.
5286 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5288 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5289 Implemented by Pravin Satpute.
5291 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5293 * nscd caches now all timeouts for DNS entries
5294 Implemented by Ulrich Drepper.
5296 * nscd is more efficient and wakes up less often.
5297 Implemented by Ulrich Drepper.
5299 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5300 vdprintf, and obstack_vprintf.
5301 Implemented by Jakub Jelinek.
5303 * Faster memset for x86-64.
5304 Implemented by Harsha Jagasia and H.J. Lu.
5306 * Faster memcpy on x86.
5307 Implemented by Ulrich Drepper.
5309 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5310 Implemented by Ulrich Drepper.
5312 * Faster sqrt and sqrtf implemention for some PPC variants.
5313 Implemented by Steven Munroe.
5317 * The following bugs are resolved with this release:
5319 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5320 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5321 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5322 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5323 5071, 5103, 5104, 5112, 5113, 5184, 5186
5325 * More checking functions: fread, fread_unlocked, open*, mq_open.
5326 Implemented by Jakub Jelinek and Ulrich Drepper.
5328 * Extend fortification to C++. Implemented by Jakub Jelinek.
5330 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5331 by not recognizing 'a' as a modifier when those specs are requested.
5332 Implemented by Jakub Jelinek.
5334 * PPC optimizations to math and string functions.
5335 Implemented by Steven Munroe.
5337 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5338 options to be passed. Implemented by Ulrich Drepper.
5340 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5342 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5343 Implemented by Ulrich Drepper.
5345 * Handle private futexes in the NPTL implementation.
5346 Implemented by Jakub Jelinek and Ulrich Drepper.
5348 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5349 Implemented by Roland McGrath and Ulrich Drepper.
5351 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5353 * SHA-256 and SHA-512 based password encryption.
5354 Implemented by Ulrich Drepper.
5356 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5357 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5360 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5361 Implemented by Ulrich Drepper.
5365 * The following bugs are resolved with this release:
5367 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5368 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5369 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5370 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5371 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5372 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5373 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5376 * New Linux interfaces: epoll_pwait, sched_getcpu.
5378 * New generic interfaces: strerror_l.
5380 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5384 * The following bugs are resolved with this release:
5386 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5387 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5388 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5389 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5390 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5391 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5392 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5393 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5394 3225, 3251, 3252, 3253, 3273
5396 * For Linux, the sorting of addresses returned by getaddrinfo now also
5397 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5398 Implemented by Ulrich Drepper.
5400 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5401 Implemented by Ulrich Drepper.
5403 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5405 * New iconv module for MIK. Contributed by Alexander Shopov.
5407 * For sites with broken group and/or passwd database, the auto-propagate
5408 option of nscd can prevent creating ID lookup entries from the results
5409 of a name lookup and vice versa. This usually is no problem but some
5410 site might have problems with the default behavior.
5411 Implemented by Ulrich Drepper.
5413 * Iterating over entire database in NIS can be slow. With the
5414 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5415 to trade time for memory. The entire database will be read at once.
5416 Implemented by Ulrich Drepper.
5418 * The interfaces introduced in RFC 3542 have been implemented by
5421 * Support for the new ELF hash table format was added by Ulrich Drepper.
5423 * Support for priority inheritance mutexes added by Jakub Jelinek and
5426 * Support for priority protected mutexes added by Jakub Jelinek.
5428 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5429 or_IN, csb_PL, fy_NL, sr_ME.
5433 * More overflow detection functions.
5435 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5436 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5438 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5439 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5440 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5441 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5442 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5443 by Masahide Washizawa.
5445 * It is now possible to install audit libraries for the dynamic linker using
5446 LD_AUDIT. Implemented by Ulrich Drepper.
5448 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5449 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5450 For a libc and libpthread that works well on Linux 2.4 kernels, we
5451 recommend using the stable 2.3 branch.
5453 * The new function open_wmemstream acts like open_memstream,
5454 but uses a wchar_t wide character buffer.
5456 * The new function ppoll is an improved version of poll, similar to pselect.
5458 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5459 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5460 renameat, unlinkat, linkat, symlinkat, readlinkat.
5462 * New Linux kernel system calls: unshare,
5463 inotify_init, inotify_add_watch, inotify_rm_watch.
5465 * The euidaccess function is now also known by the alias eaccess,
5466 for compatibility with some other systems.
5468 * Timezone data updated to 2006b version.
5472 * The following bugs are resolved with this release:
5474 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5475 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5476 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5477 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5478 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5479 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5481 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5483 * As of this release, GCC 4 can be used to compile the C Library.
5485 * Timezone data updated to 2005m version.
5489 * The following bugs are resolved with this release:
5491 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5492 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5493 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5494 777, 787, 821, 822, 823, 825
5496 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5500 * Support for RFC 3678. Real implementations exist only for Linux so far.
5501 Implemented by Ulrich Drepper.
5503 * nscd can now cache entries persistently. Expiring entries are reloaded.
5504 For speedups the cache can be shared in memory with client processes.
5505 Implemented by Ulrich Drepper.
5507 * nscd can now perform SELinux checks.
5508 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5510 * getaddrinfo queries are now cached. Canonical name lookup is performed
5512 Implemented by Ulrich Drepper.
5514 * The nothrow function attribute is used when headers are used by gcc when
5515 compiling C code. This can avoid significant amounts of exception
5518 * The malloc functions perform more error checking and are stricter when
5519 it comes to reacting on errors. The default action is to terminate
5520 the process after showing an error message. Implemented by Ulrich Drepper.
5522 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5523 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5525 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5526 namespaces using the new function dlmopen(). This feature is of course,
5527 like most other dynamic loading functionality, not available in statically
5528 linked applications. Implemented by Ulrich Drepper.
5530 * Low-overhead boundary checking variants of string and some stdio functions
5531 were added. These are to be used in conjunction with a gcc patch by
5532 Jakub Jelinek which adds calls to these functions if possible.
5533 Implemented by Jakub Jelinek and Ulrich Drepper.
5535 * Old code for several operating systems and machine architectures that
5536 have not been in working condition in a long time have been removed from
5537 the main source tree maintained by the GNU C Library's maintainers.
5538 These files are now reside in the separate `ports' source module
5539 that is usable as an add-on when building the library.
5543 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5544 interrogate the dynamic linker, compatible with the Solaris interface.
5546 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5547 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5549 * getifaddrs now uses the netlink interface on Linux to get its information.
5550 Implemented by Thorsten Kukuk.
5552 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5553 Implemented by Ulrich Drepper.
5555 * support for non-executable stacks on x86 has been added. Changes mostly
5558 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5561 * getaddrinfo now performs destination address selection according to
5566 * Thread-safe interfaces for many functions that access locale data
5567 were added in version 2.3, but these features were omitted from NEWS.
5568 Many functions have variants with an `_l' suffix that take a `locale_t'
5569 object as a parameter rather than consulting the current locale.
5570 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5571 create and maintain `locale_t' objects. Additionally, the new function
5572 `uselocale' sets "the current locale" (as used by functions not so
5573 parameterized) set for an individual thread. These features were added
5574 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5576 * The functions getresuid, getresgid, setresuid, and setresgid, which
5577 have long been available on Linux, are now declared in <unistd.h>
5578 and are now also available on the Hurd.
5580 * ELF thread-local storage support (TLS) now works on x86-64.
5582 * The new dynamic string token $LIB is expanded in shared library names.
5583 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5585 * Aldy Hernandez contributed complete software floating point support for
5586 PowerPC machines with no FPU.
5588 * fexecve is implemented on Linux.
5590 * The `btowc' function should work at least twice as fast due to
5591 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5593 * With approriate thread add-ons cancelable functions are now implemented
5594 in libc.so as well. No need to call the function in libpthread. This
5595 change allowed to finally disable the incorrect and expensive handling
5596 of weak definition in ld.so.
5598 * Yet more PLT entries in libc.so have been removed. We finally arrived
5599 at the bare minimum. Startup times improved appropriately.
5601 * Support for the new Linux/x86 system call interface was added. The
5602 AT_SYSINFO auxiliary vector entry is recognized and handled.
5606 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5609 * iconv (the program and the interface) now accepts empty names (excluding
5610 options like //TRANSLIT) to mean "use charset of current locale".
5612 * localedef can now transliterate characters in strings which are not in
5613 the provided charmap. The information from the input locale is used.
5615 * Prelinking support was added for ELF targets. This requires additional
5616 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5618 * Read-only stdio streams now use mmap to speed up operation by eliminating
5619 copying and buffer underflows. To use add 'm' to the mode string of
5620 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5622 * The malloc functions were completely rewritten by Wolfram Gloger based
5623 on Doug Lea's malloc-2.7.0.c.
5625 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5626 implementation of regex.
5628 * Bruno Haible upgraded the iconv and locale implementation to support
5631 * Contents of the LC_* and LANG environment variables in the CEN style are
5632 not recognized anymore. It never was used. Change by Ulrich Drepper.
5634 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5635 thread-local storage (TLS) ABI on some platforms.
5636 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5638 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5639 EUC-JISX0213, and TSCII.
5641 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5642 BSD-compatible interface for getting all network interface addresses.
5643 Implementation for IPv4 by Roland McGrath.
5645 * Loading of locale data is faster due to the introduction of a locale
5646 archive. Implemented by Roland McGrath and Ulrich Drepper.
5648 * Startup times are significantly reduced by not using exported functions
5649 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5652 * Steven Munroe contributed a port to PowerPC64/Linux.
5656 * The Hurd now uses the GNU libio implementation of stdio rather than the
5657 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5659 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5660 with the same behavior as the Linux system call of the same name.
5664 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5665 128-bit long double format.
5667 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5668 IBM1161, and IBM1162 charsets.
5670 * Andreas Jaeger contributed a port to x86-64/Linux.
5672 * Peter Bruin contributed a port to PowerPC/Hurd.
5674 * libc functions using I/O streams now can handle wide-oriented streams
5677 * optimizations in the dynamic linker. Binaries created by recent binutils
5678 versions start up quicker due to reduced time spent on relocations.
5680 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5684 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5685 asinh, atanh, j0 for the 128-bit long double format.
5687 * Bruno Haible updated all the code handling Unicode in some form to
5688 support Unicode 3.1.
5690 * Speed of regex for single-byte locales is back to previous levels.
5691 Patch by Isamu Hasegawa.
5693 * Alpha, SPARC, and IA-64 now also using floating stacks.
5695 * Startup time of internationalized applications greatly improved through
5696 iconv cache. Use iconvconfig to generate the cache file.
5697 Contributed by Ulrich Drepper.
5699 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5700 severe performance problems. Patch by David Mosberger.
5702 * The Hurd port got a lot more functionality like AIO, various stdio
5703 extensions, etc. Mainly done by Roland McGrath.
5705 * mtrace can now lookup symbols in shared libraries.
5709 * Intel's IA-64 math library is largely integrated. It provides fast and
5710 accurate implementatations for most basic and standard math functions
5711 in float, double, and long double format.
5713 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5714 and asin for the 96-bit long double format and asin, log, tan for the
5715 128-bit long double format.
5717 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5718 The basic double functions exist today. Contributed by Abraham Ziv
5719 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5720 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5722 * An asynchronous name lookup library was added. The interface is designed
5723 after POSIX AIO. The proposal was circulated beforehand to get comments.
5724 No negative ones came in. Implemented by Ulrich Drepper.
5726 * Port to S390/64bit contributed by Martin Schwidefsky
5727 <schwidefsky@de.ibm.com>.
5729 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5730 of functions for Linux/IA-64.
5732 * The RPC code is now thread safe. Threads can now use the same service
5733 of different services at the same time. Patch by Eric Norum
5734 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5736 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5737 family of functions for Linux/S390.
5739 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5740 of functions for Linux/x86.
5742 * Port to Linux/CRIS contributed by Axis Communications.
5746 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5747 we can now check for namespace violations and missing declarations. The
5748 result is that almost all headers are now Unix-compliant (as defined in
5749 the upcoming XPG6). The negative side is that some programs might need
5750 corrections, too, if they depend on the incorrect form of the headers in
5751 previous versions which defined too many symbols and included too many
5754 * regex now handles multibyte character sets correctly.
5755 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5757 * iconv (the program) does now conform to the upcoming XPG6 and handles
5758 charmaps. Instead of the charset names the path of charmaps can be
5759 provided and the conversion happens based on this data.
5760 Contributed by Ulrich Drepper.
5762 * The locale program now provides detailed information about the installed
5767 only lists the names of the supported locales
5771 provides details such as country, language, and codeset name.
5772 Contributed by Ulrich Drepper.
5776 * The gencat program now parses the input file according to the charset
5777 selected by the LC_CTYPE category. This is important for stateful
5778 character sets. To make generating catalogs easier there is a way
5779 to overwrite the charset selected by the locale: before the first
5780 message or $ quote line the catalog can contain a line like
5782 $ codeset=ISO-8859-2
5784 to select the charset (ISO-8859-2 in this case).
5786 Implemented by Shinya Hanataka and Ulrich Drepper.
5788 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5789 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5790 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5792 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5793 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5795 * The LANGUAGE environment variable is now ignored unless the locale is
5796 changed from the default "C" locale.
5798 * The usual bug fixes.
5802 * Greg McGary added runtime support for bounds checking using gcc's
5803 new -fbounded-pointers option. ix86 target is complete. PowerPC
5806 * Thorsten Kukuk added secure mode support to nscd.
5808 * The Berkeley db libraries have been removed.
5810 Related, the nss_db module is now in a separate package since it
5811 obviously requires a database library being available.
5813 * Wide character I/O streams implemented by Ulrich Drepper.
5815 * Functions from the extended socket API added by Ulrich Drepper.
5817 * Functions feenableexcept and fedisableexcept to control the
5818 behaviour of individual exceptions have been added by Andreas Jaeger.
5820 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5822 * The resolver code has been updated from bind 8.2.3-T5B which supports
5823 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5826 This change could in some situations effect backward compatibility. Since
5827 now `_res' is a thread-local instead of a global variable, modifying it
5828 in one thread does not have any effect in other threads.
5830 The resolver library was also extended to allow IPv6 as the transport
5831 protocol for the requests. This work was done by Stig Venaas.
5833 * Compatibility code for K&R C compilers has been removed from the
5834 header files. A ISO C compiler is needed to use the library
5835 (conforming to either C89 or C99 standard).
5837 * Complete rewrite of the localedef program to support multibyte character
5838 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5839 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5840 Implemented by Ulrich Drepper.
5842 Bruno Haible significantly improved the generation and use of the data
5843 structures for the wide character tables.
5845 * Plural handling in gettext implemented by Ulrich Drepper.
5847 * The utmp daemon has been removed.
5849 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5851 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5854 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5856 * POSIX barriers implemented by Kaz Kylheku.
5858 * POSIX spawn function family implemented by Ulrich Drepper.
5860 * POSIX spinlocks are now available.
5862 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5864 * the configure option --enable-kernel=X.Y.Z allows to strip out
5865 compatibility for kernel versions before X.Y.Z. This is currently only
5866 implemented for Linux.
5868 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5869 field sin6_scope_id. This means that all programs using IPv6 should be
5870 recompiled. Don't expect binary compatibility with previous glibc
5873 * various conversion modules for IBM character sets contributed by
5876 * IA-64 port by Jes Sorensen and HJ Lu.
5890 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5892 * New xdr functions are added; some rpc functions are now 64bit clean.
5894 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5896 * Fixed known incompatibilities with glibc 2.0.
5898 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5900 * Optimized a number of functions (especially the ELF dynamic loader).
5902 * Update timezone data files.
5904 * lots of charmaps corrections
5906 * some new locale definitions and charmaps
5911 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5912 conform to POSIX member type requirements. Symbol versions have been
5913 adjusted as needed within the library, and for direct use by applications,
5914 but there is potential for problems if third-party libraries use
5915 struct timeval as part of their interface. This does not present
5916 a problem for X and other "essential" system libraries.
5918 * An additional locale model to support C++ Standard Library locale
5919 model and probably more was implemented by Ulrich Drepper.
5921 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5924 * Miles Bader provided the `argp' function family to support hierachical
5925 command line argument parsing, layered on top of getopt.
5927 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5929 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5932 * scanf recognizes the %a and %A format for scanning floating point numbers.
5934 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5935 information and interfaces for the available integer types.
5937 * about 130 new math functions were added to implement the ISO C9x math
5940 * the new header <complex.h> contains definitions of the complex math
5941 functions from ISO C 9X.
5943 * the new header <tgmath.h> defines generic macros to use complex or
5944 real valued functions.
5946 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5948 * Andreas Jaeger provided a test suite for the math library.
5950 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5952 * Ulrich Drepper added character set conversion functions (iconv).
5954 * Optimized string functions have been added.
5956 * The localedata addon is now part of glibc.
5958 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5960 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5961 daemon for NSS (nscd).
5963 Missing a better place here are some numbers on improvements. Under
5964 Linux 2.1.125 un-tar-ing the kernel sources takes
5968 using local files 12.19s 6.88s 22.91s
5970 using NIS 13.92s 8.91s 26.34s
5972 using NIS & nscd 10.37s 7.34s 25.30s
5974 using NIS+ 27.57s 30.37s 640.46s
5976 using NIS+ & nscd 10.25s 7.83s 26.51s
5978 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5980 Keep in mind that non-namelookup related operations dominate above times.
5981 It was just a common complain that using NIS+ unpacking the kernel is
5984 [1] The old nscd implementation is not available anymore since it was
5985 distributed with glibc up to version 2.0.98 and thus is now replaced.
5987 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5989 * Mark Kettenis provided a Hesiod NSS module.
5991 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5992 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5994 * rcmd can now handle netgroups (Dick Streefland).
5996 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5999 * Support for the IPv6 protocol has been added to the socket API, as per the
6000 latest draft standards.
6002 * Support for Linux 2.2 has been added.
6004 * Interface changes relative to the latest 2.0.x release:
6005 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6006 addseverity NEW: Unix98
6007 alphasort64 NEW: LFS
6008 argp_err_exit_status NEW: argp, GNU ext
6009 argp_error NEW: argp, GNU ext
6010 argp_failure NEW: argp, GNU ext
6011 argp_help NEW: argp, GNU ext
6012 argp_parse NEW: argp, GNU ext
6013 argp_program_bug_address NEW: argp, GNU ext
6014 argp_program_version NEW: argp, GNU ext
6015 argp_program_version_hook NEW: argp, GNU ext
6016 argp_state_help NEW: argp, GNU ext
6017 argp_usage NEW: argp, GNU ext
6018 authdes_create NEW: Secure RPC
6019 authdes_getucred NEW: Secure RPC
6020 authdes_pk_create NEW: Secure RPC
6021 backtrace NEW: GNU ext.
6022 backtrace_symbols NEW: GNU ext.
6023 backtrace_symbols_fd NEW: GNU ext.
6025 cacosf NEW: ISO C 9x
6026 cacosh NEW: ISO C 9x
6027 cacoshf NEW: ISO C 9x
6028 cacoshl NEW: ISO C 9x
6029 cacosl NEW: ISO C 9x
6036 casinf NEW: ISO C 9x
6037 casinh NEW: ISO C 9x
6038 casinhf NEW: ISO C 9x
6039 casinhl NEW: ISO C 9x
6040 casinl NEW: ISO C 9x
6042 catanf NEW: ISO C 9x
6043 catanh NEW: ISO C 9x
6044 catanhf NEW: ISO C 9x
6045 catanhl NEW: ISO C 9x
6046 catanl NEW: ISO C 9x
6047 cbc_crypt NEW: Secure RPC
6051 ccoshf NEW: ISO C 9x
6052 ccoshl NEW: ISO C 9x
6058 cimagf NEW: ISO C 9x
6059 cimagl NEW: ISO C 9x
6060 clearerr_locked REMOVED
6061 clntunix_create NEW: sunrpc ext
6063 clog10 NEW: ISO C 9x
6064 clog10f NEW: ISO C 9x
6065 clog10l NEW: ISO C 9x
6075 cprojf NEW: ISO C 9x
6076 cprojl NEW: ISO C 9x
6078 crealf NEW: ISO C 9x
6079 creall NEW: ISO C 9x
6084 csinhf NEW: ISO C 9x
6085 csinhl NEW: ISO C 9x
6088 csqrtf NEW: ISO C 9x
6089 csqrtl NEW: ISO C 9x
6093 ctanhf NEW: ISO C 9x
6094 ctanhl NEW: ISO C 9x
6096 des_setparity NEW: Secure RPC
6097 ecb_crypt NEW: Secure RPC
6098 endutxent NEW: Unix98
6100 exp10f NEW: ISO C 9x
6101 exp10l NEW: ISO C 9x
6105 fattach NEW: STREAMS
6106 fdetach NEW: STREAMS
6110 feclearexcept NEW: ISO C 9x
6111 fegetenv NEW: ISO C 9x
6112 fegetexceptflag NEW: ISO C 9x
6113 fegetround NEW: ISO C 9x
6114 feholdexcept NEW: ISO C 9x
6116 feraiseexcept NEW: ISO C 9x
6117 ferror_locked REMOVED
6118 fesetenv NEW: ISO C 9x
6119 fesetexceptflag NEW: ISO C 9x
6120 fesetround NEW: ISO C 9x
6121 fetestexcept NEW: ISO C 9x
6122 feupdateenv NEW: ISO C 9x
6123 fflush_locked REMOVED
6127 fgets_unlocked NEW: GNU ext.
6128 fileno_locked REMOVED
6140 fputc_locked REMOVED
6141 fputs_unlocked NEW: GNU ext.
6142 fread_unlocked NEW: GNU ext.
6147 fstatvfs NEW: Unix98
6151 ftruncate64 NEW: LFS
6153 fwrite_unlocked NEW: GNU ext.
6154 gai_strerror NEW: IPv6
6158 getchar_locked REMOVED
6160 getdate_err NEW: Unix98
6161 getdate_r NEW: GNU ext.
6163 getnameinfo NEW: IPv6
6164 getnetname NEW: Secure RPC
6165 getpmsg NEW: STREAMS
6166 getpt NEW: Unix98 PTY
6167 getrlimit64 NEW: LFS
6168 getutxent NEW: Unix98
6169 getutxid NEW: Unix98
6170 getutxline NEW: Unix98
6171 glob64 NEW: GNU ext.
6172 globfree64 NEW: GNU ext.
6173 gnu_get_libc_release NEW: GNU ext.
6174 gnu_get_libc_version NEW: GNU ext.
6175 grantpt NEW: Unix98 PTY
6176 host2netname NEW: Secure RPC
6178 iconv_close NEW: iconv
6179 iconv_open NEW: iconv
6180 if_freenameindex NEW: IPv6
6181 if_indextoname NEW: IPv6
6182 if_nameindex NEW: IPv6
6183 if_nametoindex NEW: IPv6
6184 in6addr_any NEW: IPv6
6185 in6addr_loopback NEW: IPv6
6186 inet6_isipv4mapped NEW: IPv6
6187 isastream NEW: STREAMS
6188 iswblank NEW: GNU ext.
6189 key_decryptsession NEW: Secure RPC
6190 key_decryptsession_pk NEW: Secure RPC
6191 key_encryptsession NEW: Secure RPC
6192 key_encryptsession_pk NEW: Secure RPC
6193 key_gendes NEW: Secure RPC
6194 key_get_conv NEW: Secure RPC
6195 key_secretkey_is_set NEW: Secure RPC
6196 key_setnet NEW: Secure RPC
6197 key_setsecret NEW: Secure RPC
6198 llrint NEW: ISO C 9x
6199 llrintf NEW: ISO C 9x
6200 llrintl NEW: ISO C 9x
6201 llround NEW: ISO C 9x
6202 llroundf NEW: ISO C 9x
6203 llroundl NEW: ISO C 9x
6208 lrintf NEW: ISO C 9x
6209 lrintl NEW: ISO C 9x
6210 lround NEW: ISO C 9x
6211 lroundf NEW: ISO C 9x
6212 lroundl NEW: ISO C 9x
6214 makecontext NEW: Unix98
6215 mempcpy NEW: GNU ext.
6218 modify_ldt NEW: kernel
6222 nearbyint NEW: ISO C 9x
6223 nearbyintf NEW: ISO C 9x
6224 nearbyintl NEW: ISO C 9x
6225 netname2host NEW: Secure RPC
6226 netname2user NEW: Secure RPC
6227 nexttoward NEW: ISO C 9x
6228 nexttowardf NEW: ISO C 9x
6229 nexttowardl NEW: ISO C 9x
6233 passwd2des NEW: Secure RPC
6235 pow10f NEW: GNU ext.
6236 pow10l NEW: GNU ext.
6239 printf_size NEW: GNU ext.
6240 printf_size_info NEW: GNU ext.
6241 profil_counter REMOVED
6242 pthread_mutexattr_getkind_np REPLACED
6243 pthread_mutexattr_setkind_np REPLACED
6244 ptsname NEW: Unix98 PTY
6245 ptsname_r NEW: Unix98 PTY
6247 putchar_locked REMOVED
6248 putgrent NEW: GNU ext.
6250 putpmsg NEW: STREAMS
6251 pututxline NEW: Unix98
6255 readdir64_r NEW: LFS
6256 remquo NEW: ISO C 9x
6257 remquof NEW: ISO C 9x
6258 remquol NEW: ISO C 9x
6260 roundf NEW: ISO C 9x
6261 roundl NEW: ISO C 9x
6263 scalbln NEW: ISO C 9x
6264 scalblnf NEW: ISO C 9x
6265 scalblnl NEW: ISO C 9x
6267 sendfile NEW: kernel
6268 setcontext NEW: Unix98
6269 setrlimit64 NEW: LFS
6270 setutxent NEW: Unix98
6272 sigignore NEW: Unix98
6273 sigqueue NEW: POSIX.1b
6274 sigrelse NEW: Unix98
6275 sigset NEW: POSIX.1b
6276 sigtimedwait NEW: POSIX.1b
6277 sigwaitinfo NEW: POSIX.1b
6278 sincos NEW: GNU ext.
6279 sincosf NEW: GNU ext.
6280 sincosl NEW: GNU ext.
6284 strcasestr NEW: GNU ext.
6285 strtoimax NEW: ISO C 9x
6286 strtoumax NEW: ISO C 9x
6287 strverscmp NEW: GNU ext.
6288 svcauthdes_stats NEW: Secure RPC
6289 svcunix_create NEW: sunrpc etx
6290 svcunixfd_create NEW: sunrpc ext
6291 swapcontext NEW: Unix98
6292 tcgetsid NEW: Unix98 PTY
6293 tdestroy NEW: GNU ext.
6294 tgamma NEW: ISO C 9x
6295 tgammaf NEW: ISO C 9x
6296 tgammal NEW: ISO C 9x
6300 truncf NEW: ISO C 9x
6301 truncl NEW: ISO C 9x
6303 unlockpt NEW: Unix98 PTY
6304 updwtmpx NEW: Unix98
6305 user2netname NEW: Secure RPC
6306 utmpxname NEW: Unix98
6307 versionsort NEW: GNU ext.
6308 versionsort64 NEW: GNU ext.
6310 wcscasecmp NEW: GNU ext.
6311 wcsncasecmp NEW: GNU ext.
6312 wcsnlen NEW: GNU ext.
6313 wcstoimax NEW: ISO C 9x
6314 wcstoll NEW: ISO C 9x
6315 wcstoull NEW: ISO C 9x
6316 wcstoumax NEW: ISO C 9x
6318 wordexp NEW: POSIX.2
6319 wordfree NEW: POSIX.2
6320 write_profiling REMOVED
6321 xdecrypt NEW: Secure RPC
6322 xdr_authdes_cred NEW: Secure RPC
6323 xdr_authdes_verf NEW: Secure RPC
6324 xdr_cryptkeyarg NEW: Secure RPC
6325 xdr_cryptkeyarg2 NEW: Secure RPC
6326 xdr_cryptkeyres NEW: Secure RPC
6327 xdr_getcredres NEW: Secure RPC
6328 xdr_key_netstarg NEW: Secure RPC
6329 xdr_key_netstres NEW: Secure RPC
6330 xdr_keybuf NEW: Secure RPC
6331 xdr_keystatus NEW: Secure RPC
6332 xdr_netnamestr NEW: Secure RPC
6333 xdr_sizeof NEW: Secure RPC
6334 xdr_unixcred NEW: sunrpc ext
6335 xencrypt NEW: Secure RPC
6336 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6347 * inet_ntoa is thread-safe
6349 * updwtmp is moved from libutil to libc
6351 * rewrite of cbrt function
6353 * update of timezone data
6367 * add atoll function
6369 * fix complex problems in Berkeley DB code
6371 * fix math functions
6375 * fixed lots of header problems (especially Linux/GNU specific)
6377 * dynamic loader preserves all registers
6379 * Roland McGrath provided support for handling of auxiliary objects in
6380 the ELF dynamic loader.
6382 * support for parallel builds is improved
6386 * GNU extensions are no longer declared by default. To enable them you
6387 must define the macro `_GNU_SOURCE' in your program or compile with
6390 * The library has changed from using GNU ld symbol aliases to using weak
6391 symbols where available. The ELF object file format supports weak
6392 symbols; GNU ld also supports weak symbols in the a.out format. (There
6393 is also now support for other GNU ld extensions in ELF. Use the
6394 `--with-elf' option to configure to indicate you have ELF, and
6395 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6396 of many files which contained only symbol aliases, reducing the size of
6397 the source and the compiled library; many other files were renamed to
6398 less cryptic names previously occupied by the symbol alias files.
6399 There is a new header file <elf.h> for programs which operate on
6400 files in the ELF format.
6402 * Converted to Autoconf version 2, so `configure' has more options.
6403 Run `configure --help' to see the details.
6405 * The library can now be configured to build profiling, highly-optimized
6406 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6407 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6408 `configure' enable building these extra libraries. The shared library is
6409 built by default when using both ELF and GNU ld. When shared libraries
6410 are enabled, the new library `-ldl' is available for arbitrary run-time
6411 loading of shared objects; its interface is defined in <dlfcn.h>. The
6412 new header file <link.h> gives access to the internals of the run-time
6413 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6414 application of same name on other systems and it provides information
6415 about dynamically linked binaries.
6417 * The C library now provides the run-time support code for profiling
6418 executables compiled with `-pg'. Programs can control the profiling code
6419 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6420 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6421 the support for this file format was contributed by David Mosberger-Tang.
6423 * The math code has been replaced with a math library based on fdlibm from
6424 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6425 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6426 functions. The math functions now reside in a separate library, so
6427 programs using them will need to use `-lm' their linking commands.
6429 * John C. Bowman contributed optimized ix87 assembler inline functions.
6431 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6432 mechanism similar to that found in Solaris 2. This is now used for the
6433 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6434 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6435 file controls what services are used for each individual database. This
6436 works by loading shared libraries with names specified in `nsswitch.conf',
6437 so service modules can be changed or added at any time without even
6438 relinking any program. Currently there are the file, db, and NIS based
6439 NSS services available.
6441 * The new functions `strtoq' and `strtouq' parse integer values from
6442 strings, like `strtol' and `strtoul', but they return `long long int' and
6443 `unsigned long long int' values, respectively (64-bit quantities).
6445 * The new functions `strtof' and `strtold' parse floating-point values from
6446 strings, like `strtod', but they return `float' and `long double' values,
6447 respectively (on some machines `double' and `long double' are the same).
6449 * Ulrich Drepper has contributed new implementations of the floating-point
6450 printing and reading code used in the `printf' family of functions and
6451 `strtod', `strtof', and `strtold'. These new functions are perfectly
6452 accurate, and much faster than the old ones.
6454 * The implementation of the POSIX locale model was completely rewritten by
6455 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6456 to compile the POSIX locale definition.
6458 * The former dummy implementations of the strcoll and strxfrm function are
6459 now replaced by fully functional code contributed by Ulrich Drepper. The
6460 collation information comes from the POSIX locale definitions.
6462 * The new header <langinfo.h> defines an interface for accessing
6463 various locale-dependent data (using the locale chosen with `setlocale').
6465 * Ulrich Drepper has contributed a new suite of functions for operation on
6466 wide-character and multibyte-character strings, in <wchar.h>;
6467 and classification and case conversion of wide characters, in <wctype.h>.
6468 These new functions are conforming to the ISO C, Amendement 1 specification.
6470 * There is now a second implementation of the standard I/O library available.
6471 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6472 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6474 * You can now use positional parameter specifications in format strings
6475 for the `printf' and `scanf' families of functions. For example,
6476 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6477 ``Number 6, Mr Jones''. This is mainly useful when providing different
6478 format strings for different languages, whose grammars may dictate
6479 different orderings of the values being printed. To support this
6480 feature, the interface for `register_printf_handler' has changed; see
6481 the header file <printf.h> for details.
6483 * The `printf' and `scanf' families of functions now understand a new
6484 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6485 to group numbers as indicated by the locale; for `scanf' and friends, this
6486 says to accept as valid only a number with all the proper grouping
6487 separators in the right places. In the default "C" locale, numbers are
6488 not grouped; but locales for specific countries will define the usual
6489 conventions (i.e. separate thousands with `,' in the US locale).
6491 * The pgrp functions have been regularized, slightly incompatibly but much
6492 less confusingly. The core functions are now `getpgid' and `setpgid',
6493 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6494 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6495 provided for compatibility. There is no longer an incompatible `getpgrp'
6496 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6498 * The new header file <fts.h> and suite of functions simplify programs that
6499 operate on directory trees. This code comes from 4.4 BSD.
6501 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6502 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6503 NSS scheme used in glibc.
6505 * There is a new malloc debugging hook `__memalign_hook'.
6507 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6508 `unsigned int' in <sys/types.h>. These are for compatibility only and
6509 their use is discouraged.
6511 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6512 done differently, so that it works even without GNU ld.
6514 * New function `euidaccess' checks allowed access to a file like `access',
6515 but using the effective IDs instead of the real IDs.
6517 * The time zone data files have been updated for the latest and greatest
6518 local time conventions of the countries of the world.
6520 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6523 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6524 for formatting floating-point numbers. They are provided only for
6525 compatibility; new programs should use `sprintf' instead. There are
6526 also equivalent function for the `long double' floating-point type and
6527 all functions also exist in a reentrant form.
6529 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6530 functions for maintaining the login-record files (primarily of use to
6531 system programs such as `login'), and convenient functions for
6532 allocating and initializing a pseudo-terminal (pty) device.
6534 * Ulrich Drepper has contributed new support for System V style
6535 shared memory and IPC on systems that support it.
6537 * Ulrich Drepper has contributed several miscellaneous new functions found
6538 in System V: The `hsearch' family of functions provide an effective
6539 implementation of hash tables; `a64l' and `l64a' provide a very simple
6540 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6543 * Ulrich Drepper has contributed new reentrant counterparts for the
6544 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6546 * Ulrich Drepper has contributed new, highly-optimized versions of several
6547 string functions for the i486/Pentium family of processors.
6549 * Ulrich Drepper has updated the Linux-specific code, based largely
6550 on work done in Hongjiu Lu's version of GNU libc for Linux.
6551 The GNU library now supports Linux versions 2.0.10 and later,
6552 using the ELF object file format (i[3456]86-*-linux).
6554 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6556 * David Mosberger-Tang and Richard Henderson have ported the C library
6557 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6558 dynamic linking support for ELF/Alpha.
6560 * Richard Henderson contributed several Alpha optimized assembler function
6561 for arithmetic and string handling.
6563 * Ulrich Drepper has contributed a new set of message catalog functions to
6564 support multiple languages using the <libintl.h> interface, for use with
6565 his new package GNU gettext. Translation volunteers have contributed
6566 catalogs of the library's messages in Spanish, German, and Korean.
6568 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6569 program and the `catgets' function for reading the catalog files it
6570 creates. (The <libintl.h> interface is preferred; we include the
6571 <nl_types.h> interface using `catgets' only for source compatibility with
6572 programs already written to use it.)
6574 * New header file <values.h> gives SVID-compatible names for <limits.h>
6577 * Various new macros, declarations, and small header files for compatibility
6580 * New function `group_member' is a convenient way to check if a process has
6581 a given effective group ID.
6583 * When using GCC 2.7 and later, the socket functions are now declared in a
6584 special way so that passing an argument of type `struct sockaddr_in *',
6585 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6586 `struct sockaddr *' type, does not generate a type-clash warning.
6588 * New function `error' declared in header file <error.h> is a convenient
6589 function for printing error messages and optionally exiting; this is the
6590 canonical function used in GNU programs. The new functions `err', `warn',
6591 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6592 doing the same thing.
6594 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6595 POSIX.2 `glob' function to do ~ and {...} expansion.
6597 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6598 `clearenv' which is used in POSIX.9 is also available.
6600 * New function `getsid' returns session ID number on systems that support it.
6602 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6603 files <db.h> and <mpool.h> provide a rich set of functions for several
6604 types of simple databases stored in memory and in files, and <ndbm.h> is
6605 an old `ndbm'-compatible interface using the `db' functions. Link with
6606 `-ldb' to get these functions.
6608 * New macro `strdupa' copies a string like `strdup', but uses local stack
6609 space from `alloca' instead of dynamic heap space from `malloc'.
6611 * New function `strnlen' is like `strlen' but searches only a given maximum
6612 number of characters for the null terminator. `stpncpy', `strndup' and
6613 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6616 * New function `statfs' in header <sys/statfs.h>.
6618 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6619 provide convenient functions for operating on blocks of null-terminated
6622 * A new suite of functions in <utmp.h> handle all the details of reading
6623 and writing the utmp file.
6625 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6628 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6629 completely POSIX compliant and also implemented the extended functionality
6630 to handle alternate digit representation and alternate era date formats.
6632 * Ulrich Drepper provided an implementation of the `strptime' function
6633 defined in XPG4.2 which transforms a string into a `struct tm' value.
6635 * Paul Eggert provided the tzselect shell script as part of the timezone
6636 code. The shell script makes it easy to select the correct timezone
6639 * The implementation of the malloc family of functions is completely replaced
6640 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6641 The implementation uses the mmap function (if available) and it is
6642 optimized for the use in multi threaded programs.
6644 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6645 functions. This new functionality is usable by specifying a special
6646 salt string and it is compatible with implementation on *BSD systems.
6648 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6649 `getsubopt' to handle second level command line options, `bsd_signal'
6650 to access BSD style `signal' functionality, the obsolete `regexp' style
6653 * the `lchown' function is available on system which support this
6656 * The implementation of the shadow password handling function was contributed
6659 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6661 * POSIX.1g support was added. The <sys/select.h> header is available,
6662 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6663 implementation of `getaddrinfo'.
6667 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6669 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6670 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6672 * The new function `daemon' from 4.4 BSD is useful for server programs that
6673 want to put themselves in the background.
6675 * Joel Sherrill has contributed support for several standalone boards that
6676 run without an operating system.
6678 * `printf', `scanf' and friends now accept a `q' type modifier for long
6679 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6681 * All of the code taken from BSD (notably most of the math and networking
6682 routines) has been updated from the BSD 4.4-Lite release.
6684 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6686 * The new functions `getdomainname' and `setdomainname' fetch or change the
6687 YP/NIS domain name. These are system calls which exist on systems which
6690 * The time zone data files have been updated for the latest international
6693 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6694 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6698 * The C library now includes support for Sun RPC, from Sun's free
6699 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6700 are included. (There is still no support for YP.)
6702 * Tom Quinn has contributed a port of the C library to SGI machines running
6703 Irix 4 (mips-sgi-irix4).
6705 * The new `lockf' function is a simplified interface to the locking
6706 facilities of `fcntl', included for compatibility.
6708 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6710 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6712 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6715 * The error message printed by `assert' for a failed assertion now includes
6716 the name of the program (if using GNU ld) and the name of the calling
6717 function (with versions of GCC that support this).
6719 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6721 * The library now includes the <sys/mman.h> header file and memory
6722 management functions `mmap', `munmap', `mprotect', `msync', and
6723 `madvise', on systems that support those facilities.
6725 * The interface for `mcheck' has changed slightly: the function called to
6726 abort the program when an allocation inconsistency is detected now takes
6727 an argument that indicates the type of failure. The new function
6728 `mprobe' lets you request a consistency check for a particular block at
6729 any time (checks are normally done only when you call `free' or `realloc'
6732 * It is now possible to easily cross-compile the C library, building on one
6733 system a library to run on another machine and/or operating system. All
6734 you need to do is set the variable `HOST_CC' in `configparms' to the
6735 native compiler for programs to run on the machine you are building on (a
6736 few generator programs are used on Unix systems); set `CC' to the
6739 * The new function `fexecve' (only implemented on the GNU system) executes
6740 a program file given a file descriptor already open on the file.
6744 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6745 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6747 * You can set the variable `libprefix' in `configparms' to specify a prefix
6748 to be prepended to installed library files; this makes it easy to install
6749 the GNU C library to be linked as `-lgnuc' or whatever.
6751 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6752 copies a limited number of characters from a string, and returns the
6753 address of the last character written.
6755 * You no longer need to check for whether the installed `stddef.h' is
6756 compatible with the GNU C library. configure now checks for you.
6758 * You can now define a per-stream `fileno' function to convert the
6759 stream's cookie into an integral file descriptor.
6761 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6762 allocates zero bytes of storage, and returns a unique pointer which
6763 you can pass to `realloc' or `free'. The behavior is undefined if
6764 you dereference this pointer.
6766 * The C library now runs on Sony NEWS m68k machines running either
6767 NewsOS 3 or NewsOS 4.
6769 * The new `syscall' function is a system-dependent primitive function
6770 for invoking system calls. It has the canonical behavior on Unix
6771 systems, including unreliable return values for some calls (such as
6772 `pipe', `fork' and `getppid').
6774 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6775 to `EAGAIN', which is the preferred name. On systems whose kernels
6776 use two distinct codes, the C library now translates EWOULDBLOCK to
6777 EAGAIN in every system call function.
6781 * The GNU C Library Reference Manual is now distributed with the library.
6782 `make dvi' will produce a DVI file of the printed manual.
6783 `make info' will produce Info files that you can read on line using C-h i
6784 in Emacs or the `info' program.
6785 Please send comments on the manual to bug-glibc-manual@gnu.org.
6787 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6789 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6791 * Jason Merrill has contributed a port to the Sequent Symmetry running
6792 Dynix version 3 (i386-sequent-dynix).
6794 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6795 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6797 * New function `memory_warnings' lets you arrange to get warnings when
6798 malloc is running out of memory to allocate, like Emacs gives you.
6800 * The C library now contains the relocating allocator used in Emacs 19 for
6801 its editing buffers. This allocator (ralloc) minimizes allocation
6802 overhead and fragmentation by moving allocated regions around whenever it
6803 needs to. You always refer to a ralloc'd region with a "handle" (a
6804 pointer to a pointer--an object of type `void **').
6806 * There is a new `printf' format: `%m' gives you the string corresponding
6807 to the error code in `errno'.
6809 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6810 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6811 pass, the `a' modifier says to fill in a `char **' you pass with a
6814 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6815 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6816 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6818 * `mkstemp' is a traditional Unix function to atomically create and open a
6819 uniquely-named temporary file.
6823 * The standard location for the file that says what the local timezone is
6824 has changed again. It is now `/usr/local/etc/localtime' (or more
6825 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6827 * The distribution no longer contains any files with names longer than 14
6830 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6831 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6833 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6837 * The configuration process has changed quite a bit. The `configure'
6838 script is now used just like the configuration scripts for other GNU
6839 packages. The `sysdeps' directory hierarchy is much rearranged.
6840 The file `INSTALL' explains the new scheme in detail.
6842 * The header files no longer need to be processed into ANSI C and
6843 traditional C versions. There is just one set of files to install, and
6844 it will work with ANSI or old C compilers (including `gcc -traditional').
6846 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6847 MIPS DECStation running Ultrix 4.
6849 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6850 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6851 made itself into a shared library.
6853 * Yet further improved support for the i386, running 4.3 BSD-like systems
6854 (such as Mach 3 with the Unix single-server), or System V.
6856 * New function `strncasecmp' to do case-insensitive string comparison
6857 with limited length.
6859 * New function `strsep' is a reentrant alternative to `strtok'.
6861 * New functions `scandir' and `alphasort' for searching directories.
6863 * New function `setenv' is a better interface to `putenv'.
6865 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6866 function for traversing a directory tree.
6868 * The GNU obstack package is now also part of the C library.
6869 The new function `open_obstack_stream' creates a stdio stream that
6870 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6871 formatted output directly to an obstack.
6873 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6874 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6876 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6878 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6879 things to your strings.
6881 * There are some new test programs: test-fseek, testmb, and testrand.
6883 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6884 These ports are not finished, but are a good starting place for really
6885 supporting those systems.
6887 * `/etc/localtime' is now the standard location for the file that says what
6888 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6889 This follows the general principle that `/etc' is the place for all local
6890 configuration files.
6892 * The C library header files now use `extern "C"' when used by the C++
6893 compiler, so the C library should now work with C++ code.
6895 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6896 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6899 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6900 function which uses the `merge sort' algorithm, and is said to be
6901 significantly faster than the old GNU `qsort' function. Merge sort is
6902 now the standard `qsort' function. The new algorithm can require a lot
6903 of temporary storage; so, the old sorting function is called when the
6904 required storage is not available.
6906 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6907 provides the Unix `crypt' function, plus some other entry points.
6909 * The code and header files taken from 4.4 BSD have been updated with the
6910 latest files released from Berkeley.
6912 ----------------------------------------------------------------------
6915 Permission is granted to anyone to make or distribute verbatim copies
6916 of this document as received, in any medium, provided that the
6917 copyright notice and this permission notice are preserved,
6918 thus giving the recipient permission to redistribute in turn.
6920 Permission is granted to distribute modified versions
6921 of this document, or of portions of it,
6922 under the above conditions, provided also that they
6923 carry prominent notices stating who last changed them.
6926 version-control: never