1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2022 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Unicode 14.0.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 14.0.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * Bump r_version in the debugger interface to 2 and add a new field,
17 r_next, support multiple namespaces.
19 * Support for the C.UTF-8 locale has been added to glibc. The locale
20 supports full code-point sorting for all valid Unicode code points. A
21 limitation in the framework for fnmatch, regexec, and regcomp requires
22 a compromise to save space and only ASCII-based range expressions are
23 supported for now (see bug 28255). The full size of the locale is
24 only ~400KiB, with 346KiB coming from LC_CTYPE information for
25 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
26 in various downstream distributions. The locale is not built into
27 glibc, and must be installed.
29 * <math.h> functions that round their results to a narrower type, and
30 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
31 18661-3:2015 and draft ISO C2X:
33 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
34 fMxsqrtfN and fMxsqrtfNx functions.
36 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
39 * <math.h> functions for floating-point maximum and minimum,
40 corresponding to new operations in IEEE 754-2019, and corresponding
41 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
42 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
43 fminimum_mag, fminimum_mag_num and corresponding functions for float,
44 long double, _FloatN and _FloatNx.
46 * <math.h> macros for single-precision float constants are added as a
47 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
48 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
51 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
52 predefined as specified in TS 18661-1:2014.
54 * The exp10 functions in <math.h> now have a corresponding type-generic
57 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
59 * printf-family functions now support the %b format for output of
60 integers in binary, as specified in draft ISO C2X, and the %B variant
61 of that format recommended by draft ISO C2X.
63 * A new DSO sorting algorithm has been added in the dynamic linker that uses
64 topological sorting by depth-first search (DFS), solving performance issues
65 of the existing sorting algorithm when encountering particular circular
66 object dependency cases.
68 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
69 the two DSO sorting algorithms. The default setting of '2' uses the
70 new DFS-based algorithm. The setting '1' switches to the old
71 algorithm used in glibc 2.33 and earlier.
73 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
74 to be used by compilers for optimizing usage of 'memcmp' when its
75 return value is only used for its boolean status.
77 * Support for automatically registering threads with the Linux rseq
78 system call has been added. This system call is implemented starting
79 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
80 operations on per-cpu data. It allows user-space to perform updates
81 on per-cpu data without requiring heavy-weight atomic operations.
82 Automatically registering threads allows all libraries, including
83 libc, to make immediate use of the rseq support by using the
84 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
85 variables. The GNU C Library manual has details on integration of
86 Restartable Sequences.
88 * A symbolic link to the dynamic linker is now installed under
89 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
91 * All programs and the testsuite in glibc are now built as position independent
92 executables (PIE) by default on toolchains and architectures that support it.
93 Further, if the toolchain and architecture supports it, even static programs
94 are built as PIE and the resultant glibc can be used to build static PIE
95 executables. A new option --disable-default-pie has been added to disable
96 this behavior and get a non-PIE build. This option replaces
97 --enable-static-pie, which no longer has any effect on the build
100 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
101 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
102 or to use huge pages directly with mmap calls with the MAP_HUGETLB
103 flags). The former can improve performance when Transparent Huge Pages
104 is set to 'madvise' mode while the latter uses the system reserved
107 * The printf family of functions now handles the flagged %#m conversion
108 specifier, printing errno as an error constant (similar to strerrorname_np).
110 * The function _dl_find_object has been added. In-process unwinders
111 can use it to efficiently locate unwinding information for a code
114 * Support for OpenRISC running on Linux has been added. This port requires
115 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
120 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
121 64-bit file offsets (LFS default).
123 * A new configure option, --with-rtld-early-cflags, can be used to
124 specify additional compiler flags for building the early startup code
125 of the dynamic linker. On targets which have CPU compatibility
126 checks, this can help to ensure that proper diagnostics are printed if
127 the dynamic loader runs on an incompatible CPU.
129 * On Linux, the epoll_pwait2 function has been added. It is similar to
130 epoll_wait with the difference the timeout has nanoseconds resolution.
132 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
133 enabling posix_spawn and posix_spawnp to set the controlling terminal in
134 the new process in a race free manner. This function is a GNU extension.
136 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
137 applications compiling with glibc and gcc 12 and later. Level 3 leverages
138 the __builtin_dynamic_object_size function to deliver additional
139 fortification balanced against additional runtime cost (checking non-constant
142 Deprecated and removed features, and other changes affecting compatibility:
144 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
145 has been removed since the first PT_LOAD segment is no longer executable
146 due to defaulting to -z separate-code.
148 * The r_version update in the debugger interface makes the glibc binary
149 incompatible with GDB binaries built without the following commits:
151 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
152 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
154 when audit modules or dlmopen are used.
156 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
158 * The --enable-static-pie option is no longer available. The glibc build
159 configuration script now automatically detects static-pie support in the
160 toolchain and architecture and enables it if available.
162 * The catchsegv script and associated libSegFault.so shared object have
163 been removed. There are widely-deployed out-of-process alternatives for
164 catching coredumps and backtraces.
166 * Support for prelink will be removed in the next release; this includes
167 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
168 variables and their functionality in the dynamic loader.
170 * The audit module interface version LAV_CURRENT is increased to enable
171 proper bind-now support. The loader now advertises via the la_symbind
172 flags that PLT trace is not possible.
174 * The audit interface on aarch64 is extended to support both the indirect
175 result location register (x8) and NEON Q register. Old audit modules are
176 rejected by the loader.
178 Changes to build and runtime requirements:
180 [Add changes to build and runtime requirements here]
182 Security related changes:
184 CVE-2022-23219: Passing an overlong file name to the clnt_create
185 legacy function could result in a stack-based buffer overflow when
186 using the "unix" protocol. Reported by Martin Sebor.
188 CVE-2022-23218: Passing an overlong file name to the svcunix_create
189 legacy function could result in a stack-based buffer overflow.
191 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
192 function could result in a memory leak and potential access of
193 uninitialized memory. Reported by Qualys.
195 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
196 function may result in an off-by-one buffer underflow and overflow
197 when the current working directory is longer than PATH_MAX and also
198 corresponds to the / directory through an unprivileged mount
199 namespace. Reported by Qualys.
201 The following bugs are resolved with this release:
203 [The release manager will add the list generated by
204 scripts/list-fixed-bugs.py just before the release.]
211 * In order to support smoother in-place-upgrades and to simplify
212 the implementation of the runtime all functionality formerly
213 implemented in the libraries libpthread, libdl, libutil, libanl has
214 been integrated into libc. New applications do not need to link with
215 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
216 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
217 provided, so that the linker options keep working. Applications which
218 have been linked against glibc 2.33 or earlier continue to load the
219 corresponding shared objects (which are now empty). The integration
220 of those libraries into libc means that additional symbols become
221 available by default. This can cause applications that contain weak
222 references to take unexpected code paths that would only have been
223 used in previous glibc versions when e.g. preloading libpthread.so.0,
224 potentially exposing application bugs.
226 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
227 PTHREAD_STACK_MIN is no longer constant and is redefined to
228 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
229 sets for modern architectural features like Arm SVE.
231 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
232 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
233 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
234 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
235 dynamic sized register sets for modern architectural features like
238 * The dynamic linker implements the --list-diagnostics option, printing
239 a dump of information related to IFUNC resolver operation and
240 glibc-hwcaps subdirectory selection.
242 * On Linux, the function execveat has been added. It operates similar to
243 execve and it is is already used to implement fexecve without requiring
244 /proc to be mounted. However, different than fexecve, if the syscall is not
245 supported by the kernel an error is returned instead of trying a fallback.
247 * The ISO C2X function timespec_getres has been added.
249 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
250 C2X, is supported to enable declarations of functions defined in Annex F
251 of C2X. Those declarations are also enabled when
252 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
253 defined, and when _GNU_SOURCE is defined.
255 * On powerpc64*, glibc can now be compiled without scv support using the
256 --disable-scv configure option.
258 * Add support for 64-bit time_t on configurations like x86 where time_t
259 is traditionally 32-bit. Although time_t still defaults to 32-bit on
260 these configurations, this default may change in future versions.
261 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
262 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
263 only enabled for Linux and the full support requires a minimum kernel
266 * The main gconv-modules file in glibc now contains only a small set of
267 essential converter modules and the rest have been moved into a supplementary
268 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
269 in the same GCONV_PATH. Similarly, external converter modules directories
270 may have supplementary configuration files in a gconv-modules.d directory
271 with names ending with .conf to logically classify the converter modules in
274 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
275 to configure the size of the thread stack cache.
277 * The function _Fork has been added as an async-signal-safe fork replacement
278 since Austin Group issue 62 droped the async-signal-safe requirement for
279 fork (and it will be included in the future POSIX standard). The new _Fork
280 function does not run any atfork function neither resets any internal state
281 or lock (such as the malloc one), and only sets up a minimal state required
282 to call async-signal-safe functions (such as raise or execve). This function
283 is currently a GNU extension.
285 * On Linux, the close_range function has been added. It allows efficiently
286 closing a range of file descriptors on recent kernels (version 5.9).
288 * The function closefrom has been added. It closes all file descriptors
289 greater than or equal to a given integer. This function is a GNU extension,
290 although it is also present in other systems.
292 * The posix_spawn_file_actions_addclosefrom_np function has been added,
293 enabling posix_spawn and posix_spawnp to close all file descriptors greater
294 than or equal to a given integer. This function is a GNU extension,
295 although Solaris also provides a similar function.
297 * When invoked explicitly, the dynamic linker now uses the kernel to
298 execute programs that do not have any dynamic dependency (that is,
299 they are statically linked). This feature is Linux-specific.
301 * The audit libraries will avoid unnecessary slowdown if it is not required
302 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
304 Deprecated and removed features, and other changes affecting compatibility:
306 * The function pthread_mutex_consistent_np has been deprecated; programs
307 should use the equivalent standard function pthread_mutex_consistent
310 * The function pthread_mutexattr_getrobust_np has been deprecated;
311 programs should use the equivalent standard function
312 pthread_mutexattr_getrobust instead.
314 * The function pthread_mutexattr_setrobust_np has been deprecated;
315 programs should use the equivalent standard function
316 pthread_mutexattr_setrobust instead.
318 * The function pthread_yield has been deprecated; programs should use
319 the equivalent standard function sched_yield instead.
321 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
323 * Various rarely-used functions declared in <resolv.h> and
324 <arpa/nameser.h> have been deprecated. Applications are encouraged to
325 use dedicated DNS processing libraries if applicable. For <resolv.h>,
326 this affects the functions dn_count_labels, fp_nquery, fp_query,
327 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
328 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
329 p_type, putlong, putshort, res_hostalias, res_isourserver,
330 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
331 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
332 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
333 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
335 * Various symbols previously defined in libresolv have been moved to libc
336 in order to prepare for libresolv moving entirely into libc (see earlier
337 entry for merging libraries into libc). The symbols __dn_comp,
338 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
339 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
340 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
341 __res_search, __res_send formerly in libresolv have been renamed and no
342 longer have a __ prefix. They are now available in libc.
344 * The pthread cancellation handler is now installed with SA_RESTART and
345 pthread_cancel will always send the internal SIGCANCEL on a cancellation
346 request. It should not be visible to applications since the cancellation
347 handler should either act upon cancellation (if asynchronous cancellation
348 is enabled) or ignore the cancellation internal signal. However there are
349 buggy kernel interfaces (for instance some CIFS versions) that could still
350 see a spurious EINTR error when cancellation interrupts a blocking syscall.
352 * Previously, glibc installed its various shared objects under versioned
353 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
354 were provided as symbolic links. Starting with glibc 2.34, the shared
355 objects are installed under their ABI sonames directly, without
356 symbolic links. This increases compatibility with distribution
357 package managers that delete removed files late during the package
358 upgrade or downgrade process.
360 * The symbols mallwatch and tr_break are now deprecated and no longer used in
361 mtrace. Similar functionality can be achieved by using conditional
362 breakpoints within mtrace functions from within gdb.
364 * The __morecore and __after_morecore_hook malloc hooks and the default
365 implementation __default_morecore have been removed from the API. Existing
366 applications will continue to link against these symbols but the interfaces
367 no longer have any effect on malloc.
369 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
370 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
371 disabled by default in the main C library. Users looking to use these
372 features now need to preload a new debugging DSO libc_malloc_debug.so to get
373 this functionality back.
375 * The deprecated functions malloc_get_state and malloc_set_state have been
376 moved from the core C library into libc_malloc_debug.so. Legacy applications
377 that still use these functions will now need to preload libc_malloc_debug.so
378 in their environment using the LD_PRELOAD environment variable.
380 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
381 __memalign_hook and __free_hook are now removed from the API. Compatibility
382 symbols are present to support legacy programs but new applications can no
383 longer link to these symbols. These hooks no longer have any effect on glibc
384 functionality. The malloc debugging DSO libc_malloc_debug.so currently
385 supports hooks and can be preloaded to get this functionality back for older
386 programs. However this is a transitional measure and may be removed in a
387 future release of the GNU C Library. Users may port away from these hooks by
388 writing and preloading their own malloc interposition library.
390 Changes to build and runtime requirements:
392 * On Linux, the shm_open, sem_open, and related functions now expect the
393 file shared memory file system to be mounted at /dev/shm. These functions
394 no longer search among the system's mount points for a suitable
395 replacement if /dev/shm is not available.
397 Security related changes:
399 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
400 a request for netgroup lookup, may crash due to a double-free,
401 potentially resulting in degraded service or Denial of Service on the
402 local system. Reported by Chris Schanzle.
404 CVE-2021-33574: The mq_notify function has a potential use-after-free
405 issue when using a notification type of SIGEV_THREAD and a thread
406 attribute with a non-default affinity mask.
408 CVE-2021-35942: The wordexp function may overflow the positional
409 parameter number when processing the expansion resulting in a crash.
410 Reported by Philippe Antoine.
412 The following bugs are resolved with this release:
414 [4737] libc: fork is not async-signal-safe
415 [5781] math: Slow dbl-64 sin/cos/sincos for special values
416 [10353] libc: Methods for deleting all file descriptors greater than
417 given integer (closefrom)
418 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
419 name containing multi-byte character(s)
420 [14469] math: Inaccurate j0f function
421 [14470] math: Inaccurate j1f function
422 [14471] math: Inaccurate y0f function
423 [14472] math: Inaccurate y1f function
424 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
426 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
427 crashes if it fails dlsym() twice
428 [15648] nptl: multiple definition of `__lll_lock_wait_private'
429 [16063] nptl: Provide a pthread_once variant in libc directly
430 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
431 [17145] libc: syslog with LOG_CONS leaks console file descriptor
432 [17183] manual: description of ENTRY struct in <search.h> in glibc
434 [18435] nptl: pthread_once hangs when init routine throws an exception
435 [18524] nptl: Missing calloc error checking in
436 __cxa_thread_atexit_impl
437 [19329] dynamic-link: dl-tls.c assert failure at concurrent
438 pthread_create and dlopen
439 [19366] nptl: returning from a thread should disable cancellation
440 [19511] nptl: 8MB memory leak in pthread_create in case of failure
441 when non-root user changes priority
442 [20802] dynamic-link: getauxval NULL pointer dereference after static
444 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
445 [22057] malloc: malloc_usable_size is broken with mcheck
446 [22668] locale: LC_COLLATE: the last character of ellipsis is not
448 [23323] libc: [RFE] CSU startup hardening.
449 [23328] malloc: Remove malloc hooks and ensure related APIs return no
451 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
452 $PLATFORM, $ORIGIN) crashes
453 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
454 [23554] nptl: pthread_getattr_np reports wrong stack size with
456 [24106] libc: Bash interpreter in ldd script is taken from host
457 [24773] dynamic-link: dlerror in an secondary namespace does not use
458 the right free implementation
459 [25036] localedata: Update collation order for Swedish
460 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
461 shm_open to pick wrong directory
462 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
463 crash in IFUNC resolver due to stack canary (--enable-stack-
465 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
466 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
467 [27111] dynamic-link: pthread_create and tls access use link_map
468 objects that may be concurrently freed by dlclose
469 [27132] malloc: memusagestat is linked to system librt, leading to
470 undefined symbols on major version upgrade
471 [27136] dynamic-link: dtv setup at thread creation may leave an entry
473 [27249] libc: libSegFault.so does not output signal number properly
474 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
476 [27318] dynamic-link: glibc fails to load binaries when built with
477 -march=sandybridge: CPU ISA level is lower than required
478 [27343] nss: initgroups() SIGSEGVs when called on a system without
479 nsswich.conf (in a chroot)
480 [27346] dynamic-link: x86: PTWRITE feature check is missing
481 [27389] network: NSS chroot hardening causes regressions in chroot
483 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
484 [27444] libc: sysconf reports unsupported option (-1) for
485 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
486 [27462] nscd: double-free in nscd (CVE-2021-27645)
487 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
488 malloc/tst-malloc-thread-fail
489 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
490 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
492 [27522] glob: glob, glob64 incorrectly marked as __THROW
493 [27555] dynamic-link: Static tests fail with --enable-stack-
495 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
496 information for the current directory
497 [27577] dynamic-link: elf/ld.so --help doesn't work
498 [27605] libc: tunables can't control xsave/xsavec selection in
500 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
501 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
503 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
504 _nss_files_getcanonname_r) from within a dlmopen namespace.
505 [27648] libc: FAIL: misc/tst-select
506 [27650] stdio: vfscanf returns too early if a match is longer than
508 [27651] libc: Performance regression after updating to 2.33
509 [27655] string: Wrong size calculation in string/test-strnlen.c
510 [27706] libc: select fails to update timeout on error
511 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
512 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
513 tries resolving them lazily
514 [27744] nptl: Support different libpthread/ld.so load orders in
516 [27749] libc: Data race __run_exit_handlers
517 [27761] libc: getconf: Segmentation fault when passing '-vq' as
519 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
520 exceeds maximum object size 2147483647
521 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
523 [27872] build: Obsolete configure option --enable-stackguard-
525 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
526 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
527 [27892] libc: powerpc: scv ABI error handling fails to check
529 [27896] nptl: mq_notify does not handle separately allocated thread
530 attributes (CVE-2021-33574)
531 [27901] libc: TEST_STACK_ALIGN doesn't work
532 [27902] libc: The x86-64 clone wrapper fails to align child stack
533 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
534 [27939] libc: aarch64: clone does not align the stack
535 [27968] libc: s390x: clone does not align the stack
536 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
537 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
539 [28028] malloc: malloc: tcache shutdown sequence does not work if the
540 thread never allocated anything
541 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
542 [28064] string: x86_64:wcslen implementation list has wcsnlen
543 [28067] libc: FAIL: posix/tst-spawn5
544 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
545 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
547 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
548 [28089] build: tst-tls20 fails when linker defaults to --as-needed
549 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
551 [28091] network: ns_name_skip may return 0 for domain names without
559 * The dynamic linker accepts the --list-tunables argument which prints
560 all the supported tunables. This option is disable if glibc is
561 configured with tunables disabled (--enable-tunables=no).
563 * The dynamic linker accepts the --argv0 argument and provides opportunity
564 to change argv[0] string.
566 * The dynamic linker loads optimized implementations of shared objects
567 from subdirectories under the glibc-hwcaps directory on the library
568 search path if the system's capabilities meet the requirements for
569 that subdirectory. Initially supported subdirectories include
570 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
571 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
572 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
573 subdirectory names correspond to the vendor-independent x86-64
574 microarchitecture levels defined in the x86-64 psABI supplement.
576 * The new --help option of the dynamic linker provides usage and
577 information and library search path diagnostics.
579 * The mallinfo2 function is added to report statistics as per mallinfo,
580 but with larger field widths to accurately report values that are
581 larger than fit in an integer.
583 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
585 * Support for the RISC-V ISA running on Linux has been expanded to run on
586 32-bit hardware. This is supported for the following ISA and ABI pairs:
592 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
595 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
596 glibc may use additional checks that may have an additional performance
597 overhead. At present these checks are available only on LLVM 9 and later.
598 The latest GCC available at this time (10.2) does not support this level of
601 Deprecated and removed features, and other changes affecting compatibility:
603 * The mallinfo function is marked deprecated. Callers should call
606 * When dlopen is used in statically linked programs, alternative library
607 implementations from HWCAP subdirectories are no longer loaded.
608 Instead, the default implementation is used.
610 * The deprecated <sys/vtimes.h> header and the function vtimes have been
611 removed. To support old binaries, the vtimes function continues to exist
612 as a compatibility symbol. Applications should use the getrlimit or
615 * Following a change in the tzdata 2018a release upstream, the zdump
616 program is now installed in the /usr/bin subdirectory. Previously,
617 the /usr/sbin subdirectory was used.
619 * On s390(x), the type float_t is now derived from the macro
620 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
621 hardcoded to double. This does not affect the ABI of any libraries
622 that are part of the GNU C Library, but may affect the ABI of other
623 libraries that use this type in their interfaces. The new definition
624 improves consistency with compiler behavior in many scenarios.
626 * A future version of glibc will stop loading shared objects from the
627 "tls" subdirectories on the library search path, the subdirectory that
628 corresponds to the AT_PLATFORM system name, and also stop employing
629 the legacy AT_HWCAP search mechanism. Applications should switch to
630 the new glibc-hwcaps mechanism instead; if they do not do that, only
631 the baseline version (directly from the search path directory) will be
634 Changes to build and runtime requirements:
636 * On Linux, the system administrator needs to configure /dev/pts with
637 the intended access modes for pseudo-terminals. glibc no longer
638 attemps to adjust permissions of terminal devices. The previous glibc
639 defaults ("tty" group, user read/write and group write) already
640 corresponded to what most systems used, so that grantpt did not
641 perform any adjustments.
643 * On Linux, the posix_openpt and getpt functions no longer attempt to
644 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
645 (and pseudo-terminals are supported), a devpts file system is mounted
646 on /dev/pts. Current systems already meet these requirements.
648 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
650 Security related changes:
652 CVE-2021-3326: An assertion failure during conversion from the
653 ISO-20220-JP-3 character set using the iconv function has been fixed.
654 This assertion was triggered by certain valid inputs in which the
655 converted output contains a combined sequence of two wide characters
656 crossing a buffer boundary. Reported by Tavis Ormandy.
658 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
659 invoked with input containing redundant shift sequences in the IBM1364,
660 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
662 CVE-2020-29562: An assertion failure has been fixed in the iconv function
663 when invoked with UCS4 input containing an invalid character.
665 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
666 invoked with EUC-KR input containing invalid multibyte input sequences.
668 The following bugs are resolved with this release:
670 [10635] libc: realpath portability patches
671 [16124] dynamic-link: ld.so should allow to change argv[0]
672 [17924] malloc: 'free' should not set errno
673 [18683] libc: Linux faccessat implementation can incorrectly ignore
675 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
676 [23091] hurd: missing waitid support
677 [23249] libc: Epyc and other current AMD CPUs do not select the
678 "haswell" platform subdirectory
679 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
681 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
683 [24941] libc: Make grantpt usable after multi-threaded fork in more
685 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
686 [24973] locale: iconv encounters segmentation fault when converting
687 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
688 [25399] string: undefined reference to `__warn_memset_zero_len' when
689 changing gnuc version
690 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
692 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
694 [25971] libc: s390 bits/hwcap.h out of sync with kernel
695 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
696 [26100] libc: Race in syslog(3) with regards to tag printing.
697 [26124] libc: Export <cpu-features.h>
698 [26130] nscd: Inconsistent nscd cache during pruning
699 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
700 [26224] locale: iconv hangs when converting some invalid inputs from
701 several IBM character sets (CVE-2020-27618)
702 [26341] libc: realpath cyclically call __alloca(path_max) to consume
704 [26343] manual: invalid documented return type for strerrorname_np(),
705 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
706 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
708 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
710 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
711 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
713 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
714 [26553] libc: mtx_init allows type set to "mtx_recursive" only
715 [26555] string: strerrorname_np does not return the documented value
716 [26592] libc: pointer arithmetic overflows in realpath
717 [26600] network: Transaction ID collisions cause slow DNS lookups in
719 [26606] libc: [2.33 Regression] pselect is broken on x32
720 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
721 [26620] glob: fnmatch with collating symbols results in segmentation
723 [26625] libc: [2.33 Regression] CET is disabled
724 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
725 at the end of a memory mapping
726 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
727 by the caller to the kernel
728 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
729 [26647] build: [-Werror=array-parameter=] due to different
730 declarations for __sigsetjmp
731 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
733 [26649] stdio: printf should handle non-normal x86 long double numbers
734 gracefully (CVE-2020-29573)
735 [26686] build: -Warray-parameter instances building with GCC 11
736 [26687] build: -Warray-bounds instances building with GCC 11
737 [26690] stdio: Aliasing violation in __vfscanf_internal
738 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
739 [26726] build: GCC warning calling new_composite_name with an array of
741 [26736] libc: FAIL: misc/tst-sysvshm-linux
742 [26737] libc: Random FAIL: rt/tst-shm
743 [26791] libc: Missing O_CLOEXEC in sysconf.c
744 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
746 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
748 [26818] string: aarch64: string tests may run ifunc variants that are
750 [26821] libc: Memory leak test failures on Fedora 33
751 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
752 FSGSBASE/LM/RDRAND check failure
753 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
755 [26853] libc: aarch64: Missing unwind information in statically linked
757 [26923] locale: Assertion failure in iconv when converting invalid
758 UCS4 (CVE-2020-29562)
759 [26926] dynamic-link: aarch64: library dependencies are not bti
761 [26932] libc: sh: Multiple floating point functions defined as stubs
763 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
765 [26988] dynamic-link: aarch64: BTI mprotect address is not page
767 [27002] build: libc_freeres_fn build failure with GCC 11
768 [27004] dynamic-link: ld.so is miscompiled by GCC 11
769 [27008] dynamic-link: ld.so.cache should have endianness markup
770 [27042] libc: [alpha] anonymous union in struct stat confuses
772 [27053] libc: Conformance regression in system(3) (and probably also
774 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
776 [27077] network: Do not reload /etc/nsswitch.conf from chroot
777 [27083] libc: Unsafe unbounded alloca in addmntent
778 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
780 [27130] string: "rep movsb" performance issue
781 [27150] libc: alpha: wait4() is unavailable in static linking
782 [27177] dynamic-link:
783 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
785 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
786 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
787 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
788 related to combining characters (CVE-2021-3326)
795 * Unicode 13.0.0 Support: Character encoding, character type info, and
796 transliteration tables are all updated to Unicode 13.0.0, using
797 generator scripts contributed by Mike FABIAN (Red Hat).
799 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
801 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
802 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
803 Three ABIs are supported:
809 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
810 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
812 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
813 DT_DEPAUDIT dynamic section entries of the main executable.
815 * powerpc64le supports IEEE128 long double libm/libc redirects when
816 using -mabi=ieeelongdouble to compile C code on supported GCC
817 toolchains. It is recommended to use GCC 8 or newer when testing
820 * To help detect buffer overflows and other out-of-bounds accesses
821 several APIs have been annotated with GCC 'access' attribute. This
822 should help GCC 10 issue better warnings.
824 * On Linux, functions pthread_attr_setsigmask_np and
825 pthread_attr_getsigmask_np have been added. They allow applications
826 to specify the signal mask of a thread created with pthread_create.
828 * The GNU C Library now provides the header file <sys/single_threaded.h>
829 which declares the variable __libc_single_threaded. Applications are
830 encouraged to use this variable for single-thread optimizations,
831 instead of weak references to symbols historically defined in
834 * The functions sigabbrev_np and sigdescr_np have been added. The
835 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
836 SIGHUP) while sigdescr_np returns a string describing the signal number
837 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
838 attempt to translate the return description, both functions return
839 NULL for an invalid signal number.
841 They should be used instead of sys_siglist or sys_sigabbrev and they
842 are both thread and async-signal safe. These functions are GNU extensions.
844 * The functions strerrorname_np and strerrordesc_np have been added. The
845 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
846 while strerrordesc_np returns a string describing the error number
847 (e.g "Invalid argument" for EINVAL). Different than strerror,
848 strerrordesc_np does not attempt to translate the return description, both
849 functions return NULL for an invalid error number.
851 They should be used instead of sys_errlist and sys_nerr, both are
852 thread and async-signal safe. These functions are GNU extensions.
854 * AArch64 now supports standard branch protection security hardening
855 in glibc when it is built with a GCC that is configured with
856 --enable-standard-branch-protection (or if -mbranch-protection=standard
857 flag is passed when building both GCC target libraries and glibc,
858 in either case a custom GCC is needed). This includes branch target
859 identification (BTI) and pointer authentication for return addresses
860 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
861 extensions respectively for the protection to be effective,
862 otherwise the used instructions are nops. User code can use PAC-RET
863 without libc support, but BTI requires a libc that is built with BTI
864 support, otherwise runtime objects linked into user code will not be
867 Deprecated and removed features, and other changes affecting compatibility:
869 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
870 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
871 RPC header files. Backward compatibility for old programs is kept
872 only for architectures and ABIs that have been added in or before
873 glibc 2.31. New programs need to use TI-RPC
874 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
875 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
877 * Remove configure option --enable-obsolete-nsl. libnsl is only built
878 as shared library for backward compatibility and the NSS modules "nis"
879 and "nisplus" are not built at all and libnsl's headers aren't
880 installed. This compatibility is kept only for architectures and ABIs
881 that have been added in or before version 2.28. Replacement
882 implementations based on TI-RPC, which additionally support IPv6, are
883 available from <https://github.com/thkukuk/>. This change does not
884 affect the "compat" NSS module, which does not depend on libnsl
885 since 2.27 and thus can be used without NIS.
887 * The deprecated <sys/sysctl.h> header and the sysctl function have been
888 removed. To support old binaries, the sysctl function continues to
889 exist as a compatibility symbol (on those architectures which had it),
890 but always fails with ENOSYS. This reflects the removal of the system
891 call from all architectures, starting with Linux 5.5.
893 * The sstk function is no longer available to newly linked binaries.
894 Its implementation always returned with a failure, and the function
895 was not declared in any header file.
897 * The legacy signal handling functions siginterrupt, sigpause, sighold,
898 sigrelse, sigignore and sigset, and the sigmask macro have been
899 deprecated. Applications should use the sigsuspend, sigprocmask and
900 sigaction functions instead.
902 * ldconfig now defaults to the new format for ld.so.cache. glibc has
903 already supported this format for almost 20 years.
905 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
906 are no longer available to newly linked binaries, and their declarations
907 have been removed from <string.h>. They are exported solely as
908 compatibility symbols to support old binaries. All programs should use
911 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
912 are no longer available to newly linked binaries, and their declarations
913 have been removed from <stdio.h>. They are exported solely as
914 compatibility symbols to support old binaries. All programs should use
915 strerror or strerror_r instead.
917 * Both strerror and strerror_l now share the same internal buffer in the
918 calling thread, meaning that the returned string pointer may be invalided
919 or contents might be overwritten on subsequent calls in the same thread or
920 if the thread is terminated. It makes strerror MT-safe.
922 * Using weak references to libpthread functions such as pthread_create
923 or pthread_key_create to detect the singled-threaded nature of a
924 program is an obsolescent feature. Future versions of glibc will
925 define pthread_create within libc.so.6 itself, so such checks will
926 always flag the program as multi-threaded. Applications should check
927 the __libc_single_threaded variable declared in
928 <sys/single_threaded.h> instead.
930 * The "files" NSS module no longer supports the "key" database (used for
931 secure RPC). The contents of the /etc/publickey file will be ignored,
932 regardless of the settings in /etc/nsswitch.conf. (This method of
933 storing RPC keys only supported the obsolete and insecure AUTH_DES
934 flavor of secure RPC.)
936 * The __morecore and __after_morecore_hook malloc hooks and the default
937 implementation __default_morecore have been deprecated. Applications
938 should use malloc interposition to change malloc behavior, and mmap to
939 allocate anonymous memory. A future version of glibc may require that
940 applications which use the malloc hooks must preload a special shared
941 object, to enable the hooks.
943 * The hesiod NSS module has been deprecated and will be removed in a
944 future version of glibc. System administrators are encouraged to
945 switch to other approaches for networked account databases, such as
948 Changes to build and runtime requirements:
950 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
951 long double redirects.
953 Security related changes:
955 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
956 invoked with the -c option and when processing invalid multi-byte input
957 sequences. Reported by Jan Engelhardt.
959 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
960 corruption when they were passed a pseudo-zero argument. Reported by Guido
961 Vranken / ForAllSecure Mayhem.
963 CVE-2020-1752: A use-after-free vulnerability in the glob function when
964 expanding ~user has been fixed.
966 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
967 memmove functions has been fixed. Discovered by Jason Royes and Samual
968 Dytrych of the Cisco Security Assessment and Penetration Team (See
971 The following bugs are resolved with this release:
973 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
974 [10441] manual: Backtraces code example lacks error checking
975 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
976 timer_sigev_thread dangerous
977 [14231] stdio: stdio-common tests memory requirements
978 [14578] libc: /proc-based emulation for lchmod, fchmodat
979 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
980 filtee has constructor
981 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
982 sequences (CVE-2016-10228)
983 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
984 character entities for infinity & pi
985 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
986 segfaults in applications
987 [20543] libc: Please move from .gnu.linkonce to comdat
988 [22489] network: gcc warns about implicit convertion in
989 ICMP6_FILTER_SETPASS with -Wsign-conversion
990 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
991 [23294] math: Complex _FloatN functions are redirected to the wrong
992 function with -mlong-double-64
993 [23296] libc: Data race in setting function descriptor during lazy
995 [23668] dynamic-link: ldconfig: Default to the new format for
997 [23819] hurd: hurd: Add C11 thread support
998 [23990] build: test-container error out on failure to exec child.
999 [23991] build: shell-container typo in run_command_array
1000 [24638] manual: Error in example of parsing a template string
1001 [24654] manual: Wrong declaration of wcschr in libc manual
1002 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1004 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1005 dynamically loaded dsos
1006 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1007 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1009 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1010 restore EAX, ECX and EDX
1011 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1012 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1013 [25420] network: Race condition in resolv_conf.c can result in caching
1014 stale configuration forever
1015 [25487] math: sinl() stack corruption from crafted input
1017 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1019 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1020 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1022 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1023 on 32 bit and old kernel
1024 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1025 [25639] localedata: Some names of days and months wrongly spelt in
1027 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1028 amount of sigset_t bytes
1029 [25691] stdio: printf: memory leak when printing long multibyte
1031 [25715] libc: system() returns wrong errors when posix_spawn fails
1032 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1033 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1034 state for conversions that produce two Unicode code points
1035 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1036 for linux x86_64 leads to livelock
1037 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1038 test failures, invalid instruction in ld.so
1039 [25790] glob: Typo in tst-fnmatch.input
1040 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1042 [25819] localedata: Update locale data to Unicode 13.0.0
1043 [25824] libc: Abnormal function of strnlen in aarch64
1044 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1045 [25896] libc: Incorrect prctl
1046 [25902] libc: Bad LOADARGS_N
1047 [25905] dynamic-link: VSX registers are corrupted during PLT
1048 resolution when glibc is built with --disable-multi-arch and --with-
1050 [25933] string: Off by one error in __strncmp_avx2 when
1051 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1053 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1054 exiting detached thread
1055 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1057 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1059 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1060 [26073] math: getpayload() has wrong return value
1061 [26076] dynamic-link: dlmopen crashes after failing to load
1062 dependencies in audit mode
1063 [26120] localedata: column width of of some Korean
1064 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1065 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1066 [26133] libc: Incorrect need_arch_feature_F16C
1067 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1069 [26149] libc: PKU is usable only if OSPKE is set
1070 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1072 [26208] libc: Incorrect bit_cpu_CLFSH
1073 [26210] network: Incorrect use of hidden symbols for global sunrpc
1075 [26211] stdio: printf integer overflow calculating allocation size
1076 [26214] stdio: printf_fp double free
1077 [26215] stdio: printf_fp memory leak
1078 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1079 [26258] nss: nss_compat should not read input files with mmap
1080 [26332] string: Incorrect cache line size load causes memory
1081 corruption in memset
1088 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1089 enable features from the draft ISO C2X standard. Only some features from
1090 this draft standard are supported by the GNU C Library, and as the draft
1091 is under active development, the set of features enabled by this macro is
1092 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1093 by compiling with "gcc -std=gnu2x".
1095 * The <math.h> functions that round their results to a narrower type now
1096 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1097 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1098 Clarification Request 13 to TS 18661-3.
1100 * The function pthread_clockjoin_np has been added, enabling join with a
1101 terminated thread with a specific clock. It allows waiting against
1102 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1104 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1106 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1107 in queries if the trust-ad option is set via the options directive in
1108 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1109 mode, the AD bit, as provided by the name server, is available to
1110 applications which call res_search and related functions. In the default
1111 mode, the AD bit is not set in queries, and it is automatically cleared in
1112 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1113 servers and the network path to them are treated as untrusted.)
1115 Deprecated and removed features, and other changes affecting compatibility:
1117 * The totalorder and totalordermag functions, and the corresponding
1118 functions for other floating-point types, now take pointer arguments to
1119 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1120 passing. This is in accordance with the resolution of Clarification
1121 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1122 floating-point arguments directly will continue to work.
1124 * The obsolete function stime is no longer available to newly linked
1125 binaries, and its declaration has been removed from <time.h>.
1126 Programs that set the system time should use clock_settime instead.
1128 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1129 in a future version of glibc. In this release, the header still exists
1130 but calling ftime will cause a compiler warning. All programs should use
1131 gettimeofday or clock_gettime instead.
1133 * The gettimeofday function no longer reports information about a
1134 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1135 many years, as it cannot handle the full complexity of the world's
1136 timezones, but hitherto we have supported it on a best-effort basis.
1137 Changes required to support 64-bit time_t on 32-bit architectures have
1138 made this no longer practical.
1140 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1141 should expect to receive a 'struct timezone' whose tz_minuteswest and
1142 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1143 happen on a few Linux-based ports. This will be corrected in a future
1146 All callers should supply a null pointer for the 'tzp' argument to
1147 gettimeofday. For accurate information about the time zone associated
1148 with the current time, use the localtime function.
1150 gettimeofday itself is obsolescent according to POSIX. We have no plans
1151 to remove access to this function, but portable programs should consider
1152 using clock_gettime instead.
1154 * The settimeofday function can still be used to set a system-wide time
1155 zone when the operating system supports it. This is because the Linux
1156 kernel reused the API, on some architectures, to describe a system-wide
1157 time-zone-like offset between the software clock maintained by the kernel,
1158 and the "RTC" clock that keeps time when the system is shut down.
1160 However, to reduce the odds of this offset being set by accident,
1161 settimeofday can no longer be used to set the time and the offset
1162 simultaneously. If both of its two arguments are non-null, the call
1163 will fail (setting errno to EINVAL).
1165 Callers attempting to set this offset should also be prepared for the call
1166 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1167 some Linux architectures. The Linux kernel maintainers are discussing a
1168 more principled replacement for the reused API. After a replacement
1169 becomes available, we will change settimeofday to fail with ENOSYS on all
1170 platforms when its 'tzp' argument is not a null pointer.
1172 settimeofday itself is obsolescent according to POSIX. Programs that set
1173 the system time should use clock_settime and/or the adjtime family of
1174 functions instead. We may cease to make settimeofday available to newly
1175 linked binaries after there is a replacement for Linux's time-zone-like
1178 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1179 the optional CAS instruction is implemented (for instance, LEON processors
1180 are still supported, but SuperSPARC processors are not).
1182 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1185 * If a lazy binding failure happens during dlopen, during the execution of
1186 an ELF constructor, the process is now terminated. Previously, the
1187 dynamic loader would return NULL from dlopen, with the lazy binding error
1188 captured in a dlerror message. In general, this is unsafe because
1189 resetting the stack in an arbitrary function call is not possible.
1191 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1192 executable stack unless explicitly configured at build time to require
1193 minimum kernel version 4.8 or newer. This is because executing
1194 floating-point branches on a non-executable stack on Linux kernels prior to
1195 4.8 can lead to application crashes for some MIPS configurations. While
1196 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1197 expected to enable non-executable stack by default with PT_GNU_STACK by
1198 default and is thus likely to trigger a crash on older kernels.
1200 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1201 non-executable stack while dropping support for older kernels.
1203 * System call wrappers for time system calls now use the new time64 system
1204 calls when available. On 32-bit targets, these wrappers attempt to call
1205 the new system calls first and fall back to the older 32-bit time system
1206 calls if they are not present. This may cause issues in environments
1207 that cannot handle unsupported system calls gracefully by returning
1208 -ENOSYS. Seccomp sandboxes are affected by this issue.
1210 Changes to build and runtime requirements:
1212 * It is no longer necessary to have recent Linux kernel headers to build
1213 working (non-stub) system call wrappers on all architectures except 64-bit
1214 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1216 * The ChangeLog file is no longer present in the toplevel directory of the
1217 source tree. ChangeLog files are located in the ChangeLog.old directory as
1218 ChangeLog.N where the highest N has the latest entries.
1220 Security related changes:
1222 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1223 out-of-bounds write when executed in a signal frame context.
1225 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1226 environment variable during program execution after a security
1227 transition, allowing local attackers to restrict the possible mapping
1228 addresses for loaded libraries and thus bypass ASLR for a setuid
1229 program. Reported by Marcin Kościelnicki.
1231 The following bugs are resolved with this release:
1233 [12031] localedata: iconv -t ascii//translit with Greek characters
1234 [15813] libc: Multiple issues in __gen_tempname
1235 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1236 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1237 [19767] libc: vdso is not used with static linking
1238 [19903] hurd: Shared mappings not being inherited by children processes
1239 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1240 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1242 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1243 Symbols-A/B Unicode blocks
1244 [23518] libc: Eliminate __libc_utmp_jump_table
1245 [24026] malloc: malloc_info() returns wrong numbers
1246 [24054] localedata: Many locales are missing date_fmt
1247 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1248 [24304] dynamic-link: Lazy binding failure during ELF
1249 constructors/destructors is not fatal
1250 [24376] libc: RISC-V symbol size confusion with _start
1251 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1253 [24824] libc: test-in-container does not install charmap files compatible
1255 [24844] regex: regex bad pointer / leakage if malloc fails
1256 [24867] malloc: Unintended malloc_info formatting changes
1257 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1258 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1259 [24882] libc: login: pututline uses potentially outdated cache
1260 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1261 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1263 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1265 [24930] dynamic-link: dlopen of PIE executable can result in
1266 _dl_allocate_tls_init assertion failure
1267 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1268 (stringop-overflow error)
1269 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1270 functions other can lead to crashes
1271 [24967] libc: jemalloc static linking causes runtime failure
1272 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1274 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1275 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1276 [25097] libc: new -Warray-bounds with GCC 10
1277 [25112] dynamic-link: dlopen must not make new objects accessible when it
1278 still can fail with an error
1279 [25139] localedata: Please add the new mnw_MM locale
1280 [25149] regex: Array bounds violation in proceed_next_node
1281 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1282 initialized correctly
1283 [25189] libc: glibc's __glibc_has_include causes issues with clang
1285 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1286 value to an unsigned
1287 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1288 binaries (CVE-2019-19126)
1289 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1291 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1293 [25232] string: <string.h> does not enable const correctness for strchr et
1295 [25233] localedata: Consider "." as the thousands separator for sl_SI
1297 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1298 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1299 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1301 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1302 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1304 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1305 (dl_initfirst) link map pointer
1306 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1307 [25423] libc: Array overflow in backtrace on powerpc
1308 [25425] network: Missing call to __resolv_context_put in
1309 getaddrinfo.c:gethosts
1316 * Unicode 12.1.0 Support: Character encoding, character type info, and
1317 transliteration tables are all updated to Unicode 12.1.0, using
1318 generator scripts contributed by Mike FABIAN (Red Hat).
1320 * The dynamic linker accepts the --preload argument to preload shared
1321 objects, in addition to the LD_PRELOAD environment variable.
1323 * The twalk_r function has been added. It is similar to the existing
1324 twalk function, but it passes an additional caller-supplied argument
1325 to the callback function.
1327 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1329 * Minguo (Republic of China) calendar support has been added as an
1330 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1333 * The entry for the new Japanese era has been added for ja_JP locale.
1335 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1336 pvalloc, memalign, and posix_memalign fail now with total object size
1337 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1338 pointer subtraction within the allocated object, where results might
1339 overflow the ptrdiff_t type.
1341 * The dynamic linker no longer refuses to load objects which reference
1342 versioned symbols whose implementation has moved to a different soname
1343 since the object has been linked. The old error message, symbol
1344 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1345 link time reference, is gone.
1347 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1348 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1349 functions. These behave similarly to their "timed" equivalents, but also
1350 accept a clockid_t parameter to determine which clock their timeout should
1351 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1352 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1353 time of the wait (unlike with pthread_condattr_setclock, which requires
1354 the clock choice at initialization time).
1356 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1357 work, new resolvers can use a second argument which can be extended in
1358 the future, currently it contains the AT_HWCAP2 value.
1360 Deprecated and removed features, and other changes affecting compatibility:
1362 * The copy_file_range function fails with ENOSYS if the kernel does not
1363 support the system call of the same name. Previously, user space
1364 emulation was performed, but its behavior did not match the kernel
1365 behavior, which was deemed too confusing. Applications which use the
1366 copy_file_range function can no longer rely on glibc to provide a fallback
1367 on kernels that do not support the copy_file_range system call, and if
1368 this function returns ENOSYS, they will need to use their own fallback.
1369 Support for copy_file_range for most architectures was added in version
1370 4.5 of the mainline Linux kernel.
1372 * The functions clock_gettime, clock_getres, clock_settime,
1373 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1374 for new applications (on architectures which had them). Instead, the
1375 definitions in libc will be used automatically, which have been available
1378 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1379 and <sys/stropts.h> have been removed.
1381 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1382 resolver flag (deprecated in glibc 2.25) have been removed.
1384 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1385 resolver have been removed from <resolv.h>.
1387 * With --enable-bind-now, installed programs are now linked with the
1390 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1391 configurations) has been removed, following the deprecation of this
1392 subarchitecture in version 8 of GCC, and its removal in version 9.
1394 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1395 header have been removed.
1397 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1398 deprecated and will be removed from a future version of glibc.
1399 Application should directly access /proc instead. For obtaining random
1400 bits, the getentropy function can be used.
1402 Changes to build and runtime requirements:
1404 * GCC 6.2 or later is required to build the GNU C Library.
1406 Older GCC versions and non-GNU compilers are still supported when
1407 compiling programs that use the GNU C Library.
1409 Security related changes:
1411 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1412 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1413 has undefined behavior. On x32, the size_t argument may be passed
1414 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1415 32 bits. When it happened with the sign bit of RDX register set,
1416 memcmp gave the wrong result since it treated the size argument as
1417 zero. Reported by H.J. Lu.
1419 CVE-2019-9169: Attempted case-insensitive regular-expression match
1420 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1421 over-read. Reported by Hongxu Chen.
1423 The following bugs are resolved with this release:
1425 [2872] locale: Transliteration Cyrillic -> ASCII fails
1426 [6399] libc: gettid() should have a wrapper
1427 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1428 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1429 [17396] localedata: globbing for locale by [[.collating-element.]]
1430 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1431 [18465] malloc: memusagestat is built using system C library
1432 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1433 invalid input drops valid char
1434 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1435 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1436 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1437 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1438 [23352] malloc: __malloc_check_init still defined in public header
1440 [23403] nptl: Wrong alignment of TLS variables
1441 [23501] libc: nftw() doesn't return dangling symlink's inode
1442 [23733] malloc: Check the count before calling tcache_get()
1443 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1445 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1446 [23844] nptl: pthread_rwlock_trywrlock results in hang
1447 [23983] argparse: Missing compat versions of argp_failure and argp_error
1448 for long double = double
1449 [23984] libc: Missing compat versions of err.h and error.h functions for
1450 long double = double
1451 [23996] localedata: Dutch salutations
1452 [24040] libc: riscv64: unterminated call chain in __thread_start
1453 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1455 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1456 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1458 [24114] regex: regexec buffer read overrun in "grep -i
1459 '\(\(\)*.\)*\(\)\(\)\1'"
1460 [24122] libc: Segfaults if 0 returned from la_version
1461 [24153] stdio: Some input functions do not react to stdin assignment
1462 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1463 RDX is set) (CVE-2019-7309)
1464 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1465 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1466 not the default "nor"
1467 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1468 false positives, change to modern flexible array
1469 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1470 instructions while maintaining the robust mutex list due to missing
1472 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1473 unnecessary librt dependencies
1474 [24200] localedata: Revert first_weekday removal in en_IE locale
1475 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1476 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1477 [24216] malloc: Check for large bin list corruption when inserting
1479 [24228] stdio: old x86 applications that use legacy libio crash on exit
1480 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1482 [24293] localedata: Missing Minguo calendar support for TW locales
1483 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1484 tt_RU (Tatar) locale
1485 [24307] localedata: Update locale data to Unicode 12.0.0
1486 [24323] dynamic-link: dlopen should not be able open PIE objects
1487 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1488 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1489 tt_RU (Tatar) locale
1490 [24370] localedata: Add lang_name for tt_RU locale
1491 [24372] locale: Binary locale files are not architecture independent
1492 [24394] time: strptime %Ey mis-parses final year of era
1493 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1495 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1497 [24531] malloc: Malloc tunables give tcache assertion failures
1498 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1500 [24535] localedata: Update locale data to Unicode 12.1.0
1501 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1502 kernels and break testing
1503 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1504 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1505 [-Werror=format-overflow=]
1506 [24570] libc: alpha: compat msgctl uses __IPC_64
1507 [24584] locale: Data race in __wcsmbs_clone_conv
1508 [24588] stdio: Remove codecvt vtables from libio
1509 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1511 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1512 [24632] stdio: Old binaries which use freopen with default stdio handles
1514 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1516 [24652] localedata: szl_PL spelling correction
1517 [24695] nss: nss_db: calling getpwent after endpwent crashes
1518 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1519 in /etc/nsswitch.conf
1520 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1521 [24740] libc: getdents64 type confusion
1522 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1523 always implemented in the same library
1524 [24744] libc: Remove copy_file_range emulation
1525 [24757] malloc: memusagestat is linked against system libpthread
1526 [24794] libc: Partial test suite run builds corrupt test-in-container
1534 * The getcpu wrapper function has been added, which returns the currently
1535 used CPU and NUMA node. This function is Linux-specific.
1537 * A new convenience target has been added for distribution maintainers
1538 to build and install all locales as directories with files. The new
1539 target is run by issuing the following command in your build tree:
1540 'make localedata/install-locale-files', with an optional DESTDIR
1541 to set the install root if you wish to install into a non-default
1542 configured location.
1544 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1546 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1547 for _GNU_SOURCE, to match BSD environments.
1549 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1550 indicates that it will abort the transaction prior to entering the kernel
1551 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1552 suspended, and this caused some undefined side-effects issues by aborting
1553 transactions manually. Glibc avoided it by abort transactions manually on
1554 each syscall, but it lead to performance issues on newer kernels where the
1555 HTM state is saved and restore lazily (the state being saved even when the
1556 process actually does not use HTM).
1558 * The functions posix_spawn_file_actions_addchdir_np and
1559 posix_spawn_file_actions_addfchdir_np have been added, enabling
1560 posix_spawn and posix_spawnp to run the new process in a different
1561 directory. These functions are GNU extensions. The function
1562 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1565 * The popen and system do not run atfork handlers anymore (BZ#17490).
1566 Although it is a possible POSIX violation, the POSIX rationale in
1567 pthread_atfork documentation regarding atfork handlers is to handle
1568 inconsistent mutex state after a fork call in a multi-threaded process.
1569 In both popen and system there is no direct access to user-defined mutexes.
1571 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1572 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1574 - C-SKY ABIV2 soft-float little-endian
1575 - C-SKY ABIV2 hard-float little-endian
1577 * strftime's default formatting of a locale's alternative year (%Ey)
1578 has been changed to zero-pad the year to a minimum of two digits,
1579 like "%y". This improves the display of Japanese era years during
1580 the first nine years of a new era, and is expected to be harmless
1581 for all other locales (only Japanese locales regularly have
1582 alternative year numbers less than 10). Zero-padding can be
1583 overridden with the '_' or '-' flags (which are GNU extensions).
1585 * As a GNU extension, the '_' and '-' flags can now be applied to
1586 "%EY" to control how the year number is formatted; they have the
1587 same effect that they would on "%Ey".
1589 Deprecated and removed features, and other changes affecting compatibility:
1591 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1592 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1594 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1595 in <sys/procfs.h>, has been corrected to match the type actually used by
1596 the Linux kernel. This affects the size and layout of that structure on
1597 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1599 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1600 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1601 defined in <sys/procfs.h>, has been corrected to match the type actually
1602 used by the Linux kernel. This affects the size and layout of those
1605 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1606 meant to scan a string and allocate space for it with malloc, is now
1607 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1608 defined. This extension conflicts with C99's use of '%a' to scan a
1609 hexadecimal floating-point number, which is now available to programs
1610 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1612 POSIX.1-2008 includes the feature of allocating a buffer for string input
1613 with malloc, using the modifier letter 'm' instead. Programs using
1614 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1615 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1616 C99 '%a' no longer need to avoid _GNU_SOURCE.
1618 GCC's -Wformat warnings can detect most uses of this extension, as long
1619 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1620 __attribute__ ((format (scanf, ...))).
1622 Changes to build and runtime requirements:
1624 * Python 3.4 or later is required to build the GNU C Library.
1626 * On most architectures, GCC 5 or later is required to build the GNU C
1627 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1629 Older GCC versions and non-GNU compilers are still supported when
1630 compiling programs that use the GNU C Library.
1632 Security related changes:
1634 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1635 denial of service due to resource exhaustion when processing getaddrinfo
1636 calls with crafted host names. Reported by Guido Vranken.
1638 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1639 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1640 happened, accessing the 32-bit size_t value as the full 64-bit register
1641 in the assembly string/memory functions would cause a buffer overflow.
1642 Reported by H.J. Lu.
1644 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1645 addresses with arbitrary trailing characters, potentially leading to data
1646 or command injection issues in applications.
1648 The following bugs are resolved with this release:
1650 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1651 [10496] localedata: 12h time representation in multiple locales faulty
1652 [10797] localedata: it_IT locale numeric does not have a separator for
1654 [11319] libc: dprintf doesn't handle errors properly
1655 [16346] time: mktime: potentially unsafe use of localtime_offset
1656 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1658 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1659 posix_spawn_file_actions_addfchdir_np
1660 [17426] localedata: Indian locales: set the correct date format
1661 [17490] stdio: popen should not invoke atfork handlers
1662 [17783] libc: TIOCSER_TEMT conditions inconsistent
1663 [18040] regex: use-after-free in regexec/get_subexp
1664 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1665 [20018] network: getaddrinfo should reject IP addresses with trailing
1666 characters (CVE-2016-10739)
1667 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1668 [20271] libc: Missing "\n" in __libc_fatal calls
1669 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1670 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1671 pointer argument is non-NULL
1672 [21037] stdio: open_memstream and freopen
1673 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1674 [21716] time: Crash in glibc's mktime in low-memory situations
1675 [22834] stdio: Subprocess forked by popen may crash in Linux when
1676 multithreads call popen
1677 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1678 and pthread_create fails.
1679 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1680 [23125] libc: riscv64: endless loop when throwing an exception from a
1682 [23275] nptl: Race in pthread_mutex_lock while promoting to
1683 PTHREAD_MUTEX_ELISION_NP.
1684 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1686 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1688 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1690 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1691 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1693 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1694 [23521] nss: get_next_alias nss_files file stream leak
1695 [23538] nptl: Hang in pthread_cond_broadcast
1696 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1697 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1698 [23579] libc: Errors misreported in preadv2
1699 [23597] build: support/test-container.c doesn't work with different
1701 [23603] time: mktime signed integer overflow on large timestamps
1702 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1703 [23614] libc: powerpc: missing CFI register information in __mpn_*
1705 [23637] string: Generic strstr/strcasestr fails with huge needles
1706 [23640] libc: no way to easily clear FD_CLOEXEC in
1707 posix_spawn_file_actions_adddup2()
1708 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1710 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1712 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1713 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1714 bits/types/struct_rusage.h
1715 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1717 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1719 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1720 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1721 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1723 [23724] localedata: Albanian date formats are incorrect
1724 [23735] math: libnldbl_nonshared.a references internal libm symbols
1725 [23740] localedata: kl_GL: Month names and date formats need update
1726 [23744] regex: regex refactorings to remove BE, avoid duplication
1727 [23745] time: mktime fix for Gnulib + coreutils
1728 [23758] time: Improve the width of alternate representation for year in
1730 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1731 [23789] time: mktime does not set errno on failure
1732 [23791] localedata: Wrong monetary format for ca_ES locale
1733 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1734 [23794] locale: c16rtomb does not handle surrogate pairs
1735 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1736 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1737 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1738 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1739 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1740 [23862] libc: [sh] missing kernel-features.h undefines
1741 [23864] libc: [riscv] missing kernel-features.h undefines
1742 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1743 [23907] malloc: Incorrect double-free malloc tcache check disregards
1745 [23913] libc: off-by-one in function maybe_script_execute in
1746 sysdeps/posix/spawni.c
1747 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1748 [23923] locale: Add --no-hard-links option to localedef
1749 [23927] network: Linux if_nametoindex() does not close descriptor
1751 [23961] math: powf can overflow to inf without setting errno in non-
1752 nearest rounding mode
1753 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1754 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1755 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1756 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1757 [24011] localedata: Fixed small type in comment for locale bs_BA
1758 [24018] libc: gettext() may return NULL
1759 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1760 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1761 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1763 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1764 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1766 [24046] localedata: en_US locale doesn't define date_fmt
1767 [24063] manual: @var{errno} should be @code{errno}
1768 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1769 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1771 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1773 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1775 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1777 [24112] network: Do not send DNS queries for non-host names (where all
1778 answers will be rejected)
1779 [24130] libc: alpha __remqu corrupts $f3 register
1786 * The localization data for ISO 14651 is updated to match the 2016
1787 Edition 4 release of the standard, this matches data provided by
1788 Unicode 9.0.0. This update introduces significant improvements to the
1789 collation of Unicode characters. This release deviates slightly from
1790 the standard in that the collation element ordering for lowercase and
1791 uppercase LATIN script characters is adjusted to ensure that regular
1792 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1793 is not matched by [a-z]. With the update many locales have been
1794 updated to take advantage of the new collation information. The new
1795 collation information has increased the size of the compiled locale
1796 archive or binary locales.
1798 * The GNU C Library can now be compiled with support for Intel CET, AKA
1799 Intel Control-flow Enforcement Technology. When the library is built
1800 with --enable-cet, the resulting glibc is protected with indirect
1801 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1802 compatible with all existing executables and shared libraries. This
1803 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1804 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1805 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1806 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1807 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1808 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1811 * The GNU C Library now has correct support for ABSOLUTE symbols
1812 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1813 relocated incorrectly or in some cases discarded. The GNU linker can
1814 make use of the newer semantics, but it must communicate it to the
1815 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1816 field) to indicate such support is required.
1818 * Unicode 11.0.0 Support: Character encoding, character type info, and
1819 transliteration tables are all updated to Unicode 11.0.0, using
1820 generator scripts contributed by Mike FABIAN (Red Hat).
1822 * <math.h> functions that round their results to a narrower type are added
1823 from TS 18661-1:2014 and TS 18661-3:2015:
1825 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1826 fMxaddfNx functions.
1828 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1829 fMxsubfNx functions.
1831 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1832 fMxmulfNx functions.
1834 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1835 fMxdivfNx functions.
1837 * Two grammatical forms of month names are now supported for the following
1838 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1839 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1840 support two grammatical forms in abbreviated month names: Catalan, Greek,
1843 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1844 include the support for two grammatical forms of month names.
1846 * Building and running on GNU/Hurd systems now works without out-of-tree
1849 * The renameat2 function has been added, a variant of the renameat function
1850 which has a flags argument. If the flags are zero, the renameat2 function
1851 acts like renameat. If the flag is not zero and there is no kernel
1852 support for renameat2, the function will fail with an errno value of
1853 EINVAL. This is different from the existing gnulib function renameatu,
1854 which performs a plain rename operation in case of a RENAME_NOREPLACE
1855 flags and a non-existing destination (and therefore has a race condition
1856 that can clobber the destination inadvertently).
1858 * The statx function has been added, a variant of the fstatat64
1859 function with an additional flags argument. If there is no direct
1860 kernel support for statx, glibc provides basic stat support based on
1861 the fstatat64 function.
1863 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1864 library if installed. libidn2 version 2.0.5 or later is recommended. If
1865 libidn2 is not available, internationalized domain names are not encoded
1866 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1867 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1868 with an encoding error.) Flags which used to change the IDN encoding and
1869 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1870 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1871 deprecated. They no longer have any effect.
1873 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1874 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1875 range of ELF gABI expressions including such constructs as
1876 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1877 have been further restricted, and where in the past a dynamic string
1878 token sequence may have been interpreted as a literal string it will
1879 now cause a load failure. These load failures were always considered
1880 unspecified behaviour from the perspective of the dynamic loader, and
1881 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1882 results in a load failure now.
1884 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1885 implementation includes all the standard functions provided by
1888 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1889 thrd_detach, thrd_exit, and thrd_join for thread management.
1891 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1892 mtx_destroy for mutual exclusion.
1894 - call_once for function call synchronization.
1896 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1897 cnd_wait for conditional variables.
1899 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1901 Application developers must link against libpthread to use ISO C threads.
1903 Deprecated and removed features, and other changes affecting compatibility:
1905 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1906 installed. Software that was using either header should be updated to
1907 use standard <stdio.h> interfaces instead.
1909 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1910 This was never required by the C standard, and the macros just expanded
1911 to call alternative names for the same functions. If you hoped getc and
1912 putc would provide performance improvements over fgetc and fputc, instead
1913 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1914 necessary, flockfile and funlockfile.
1916 * All stdio functions now treat end-of-file as a sticky condition. If you
1917 read from a file until EOF, and then the file is enlarged by another
1918 process, you must call clearerr or another function with the same effect
1919 (e.g. fseek, rewind) before you can read the additional data. This
1920 corrects a longstanding C99 conformance bug. It is most likely to affect
1921 programs that use stdio to read interactive input from a terminal.
1924 * The macros 'major', 'minor', and 'makedev' are now only available from
1925 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1926 headers that happen to include <sys/types.h>. These macros are rarely
1927 used, not part of POSIX nor XSI, and their names frequently collide with
1928 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1929 further explanation.
1931 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1932 these macros should first include <sys/types.h>, and then include
1933 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1935 * The tilegx*-*-linux-gnu configurations are no longer supported.
1937 * The obsolete function ustat is no longer available to newly linked
1938 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1939 function has been deprecated in favor of fstatfs and statfs.
1941 * The obsolete function nfsservctl is no longer available to newly linked
1942 binaries. This function was specific to systems using the Linux kernel
1943 and could not usefully be used with the GNU C Library on systems with
1944 version 3.1 or later of the Linux kernel.
1946 * The obsolete function name llseek is no longer available to newly linked
1947 binaries. This function was specific to systems using the Linux kernel
1948 and was not declared in a header. Programs should use the lseek64 name
1949 for this function instead.
1951 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1952 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1953 previously selected by them is now always enabled.
1955 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1956 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1957 restriction (rejecting '_' in host names, among other things) has been
1958 removed, for increased compatibility with non-IDN name resolution.
1960 * The fcntl function now have a Long File Support variant named fcntl64. It
1961 is added to fix some Linux Open File Description (OFD) locks usage on non
1962 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1963 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1964 locks act as a cancellation entrypoint.
1966 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1967 ecb_crypt, and des_setparity are no longer available to newly linked
1968 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1969 longer installed. These functions encrypted and decrypted data with the
1970 DES block cipher, which is no longer considered secure. Software that
1971 still uses these functions should switch to a modern cryptography library,
1974 * Reflecting the removal of the encrypt and setkey functions above, the
1975 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1976 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1979 * The obsolete function fcrypt is no longer available to newly linked
1980 binaries. It was just another name for the standard function crypt,
1981 and it has not appeared in any header file in many years.
1983 * We have tentative plans to hand off maintenance of the passphrase-hashing
1984 library, libcrypt, to a separate development project that will, we hope,
1985 keep up better with new passphrase-hashing algorithms. We will continue
1986 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1987 'crypt_r' should not need to change at all; however, distributions will
1988 need to install <crypt.h> and libcrypt from a separate project.
1990 In this release, if the configure option --disable-crypt is used, glibc
1991 will not install <crypt.h> or libcrypt, making room for the separate
1992 project's versions of these files. The plan is to make this the default
1993 behavior in a future release.
1995 Changes to build and runtime requirements:
1997 GNU make 4.0 or later is now required to build glibc.
1999 Security related changes:
2001 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2002 been fixed by removing the glibc-internal IDNA implementation and using
2003 the system-provided libidn2 library instead. Originally reported by Hanno
2004 Böck and Christian Weisgerber.
2006 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2007 architecture could corrupt memory. Reported by Max Horn.
2009 CVE-2018-11236: Very long pathname arguments to realpath function could
2010 result in an integer overflow and buffer overflow. Reported by Alexey
2013 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2014 architecture could write beyond the target buffer, resulting in a buffer
2015 overflow. Reported by Andreas Schwab.
2017 The following bugs are resolved with this release:
2019 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2020 [6889] manual: 'PWD' mentioned but not specified
2021 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2022 when __WORDSIZE != 64
2023 [13762] regex: re_search etc. should return -2 on memory exhaustion
2024 [13888] build: /tmp usage during testing
2025 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2026 [14092] nptl: Support C11 threads
2027 [14095] localedata: Review / update collation data from Unicode / ISO
2029 [14508] libc: -Wformat warnings
2030 [14553] libc: Namespace pollution loff_t in sys/types.h
2031 [14890] libc: Make NT_PRFPREG canonical.
2032 [15105] libc: Extra PLT references with -Os
2033 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2035 [16335] manual: Feature test macro documentation incomplete and out of
2037 [16552] libc: Unify umount implementations in terms of umount2
2038 [17082] libc: htons et al.: statement-expressions prevent use on global
2039 scope with -O1 and higher
2040 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2041 [17438] localedata: pt_BR: wrong d_fmt delimiter
2042 [17662] libc: please implement binding for the new renameat2 syscall
2043 [17721] libc: __restrict defined as /* Ignore */ even in c11
2044 [17979] libc: inconsistency between uchar.h and stdint.h
2045 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2046 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2047 horrible machine code)
2048 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2050 [18471] libc: llseek should be a compat symbol
2051 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2053 [18991] nss: nss_files skips large entry in database
2054 [19239] libc: Including stdlib.h ends up with macros major and minor being
2056 [19463] libc: linknamespace failures when compiled with -Os
2057 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2058 [19527] locale: Normalized charset name not recognized by setlocale
2059 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2060 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2062 [19728] network: out of bounds stack read in libidn function
2063 idna_to_ascii_4i (CVE-2016-6261)
2064 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2065 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2066 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2068 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2069 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2070 [20419] dynamic-link: files with large allocated notes crash in
2072 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2073 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2074 [20980] manual: CFLAGS environment variable replaces vital options
2075 [21163] regex: Assertion failure in pop_fail_stack when executing a
2076 malformed regexp (CVE-2015-8985)
2077 [21234] manual: use of CFLAGS makes glibc detect no optimization
2078 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2079 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2080 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2081 [21508] locale: intl/tst-gettext failure with latest msgfmt
2082 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2083 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2084 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2086 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2088 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2089 [22247] network: Integer overflow in the decode_digit function in
2090 puny_decode.c in libidn (CVE-2017-14062)
2091 [22342] nscd: NSCD not properly caching netgroup
2092 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2093 [22550] localedata: es_ES locale (and other es_* locales): collation
2094 should treat ñ as a primary different character, sync the collation
2095 for Spanish with CLDR
2096 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2097 by gcc configured with --enable-default-pie
2098 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2099 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2100 crossing 2GB threshold (CVE-2017-18269)
2101 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2103 [22735] time: Misleading typo in time.h source comment regarding
2105 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2106 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2107 `__assert_perror_fail ()' to `__assert_fail_base ()'
2108 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2110 [22786] libc: Stack buffer overflow in realpath() if input size is close
2111 to SSIZE_MAX (CVE-2018-11236)
2112 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2113 through an absolute DT_NEEDED path
2114 [22792] build: tcb-offsets.h dependency dropped
2115 [22797] libc: pkey_get() uses non-reserved name of argument
2116 [22807] libc: PTRACE_* constants missing for powerpc
2117 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2118 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2119 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2120 [22848] localedata: ca_ES: update date definitions from CLDR
2121 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2122 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2123 [22896] localedata: Update locale data for an_ES
2124 [22902] math: float128 test failures with GCC 8
2125 [22918] libc: multiple common of `__nss_shadow_database'
2126 [22919] libc: sparc32: backtrace yields infinite backtrace with
2128 [22926] libc: FTBFS on powerpcspe
2129 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2131 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2132 [22947] libc: FAIL: misc/tst-preadvwritev2
2133 [22963] localedata: cs_CZ: Add alternative month names
2134 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2135 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2136 [22998] dynamic-link: execstack tests are disabled when SELinux is
2138 [23005] network: Crash in __res_context_send after memory allocation
2140 [23007] math: strtod cannot handle -nan
2141 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2142 [23036] regex: regex equivalence class regression
2143 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2144 [23069] libc: sigaction broken on riscv64-linux-gnu
2145 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2146 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2147 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2148 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2149 and libc build with -Os)
2150 [23140] localedata: More languages need two forms of month names
2151 [23145] libc: _init/_fini aren't marked as hidden
2152 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2153 [23171] math: C++ iseqsig for long double converts arguments to double
2154 [23178] nscd: sudo will fail when it is run in concurrent with commands
2155 that changes /etc/passwd
2156 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2158 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2159 [23208] localedata: New locale - Lower Sorbian (dsb)
2160 [23233] regex: Memory leak in build_charclass_op function in file
2162 [23236] stdio: Harden function pointers in _IO_str_fields
2163 [23250] nptl: Offset of __private_ss differs from GCC
2164 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2165 -mtune=generic -mfpmath=sse
2166 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2168 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2169 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2171 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2172 [23277] math: nan function should not have const attribute
2173 [23279] math: scanf and strtod wrong for some hex floating-point
2174 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2176 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2177 [23303] build: undefined reference to symbol
2178 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2179 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2181 [23313] stdio: libio vtables validation and standard file object
2183 [23329] libc: The __libc_freeres infrastructure is not properly run across
2185 [23349] libc: Various glibc headers no longer compatible with
2187 [23351] malloc: Remove unused code related to heap dumps and malloc
2189 [23363] stdio: stdio-common/tst-printf.c has non-free license
2190 [23396] regex: Regex equivalence regression in single-byte locales
2191 [23422] localedata: oc_FR: More updates of locale data
2192 [23442] build: New warning with GCC 8
2193 [23448] libc: Out of bounds access in IBM-1390 converter
2194 [23456] libc: Wrong index_cpu_LZCNT
2195 [23458] build: tst-get-cpu-features-static isn't added to tests
2196 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2198 [23467] dynamic-link: x86/CET: A property note parser bug
2205 * The GNU C Library can now be compiled with support for building static
2206 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2207 executables are like static executables but can be loaded at any address
2208 and provide additional security hardening benefits at the cost of some
2209 memory and performance. When the library is built with --enable-static-pie
2210 the resulting libc.a is usable with GCC 8 and above to create static PIE
2211 executables using the GCC option '-static-pie'. This feature is currently
2212 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2213 aarch64 with binutils 2.30 or later.
2215 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2216 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2219 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2221 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2223 * In order to support faster and safer process termination the malloc API
2224 family of functions will no longer print a failure address and stack
2225 backtrace after detecting heap corruption. The goal is to minimize the
2226 amount of work done after corruption is detected and to avoid potential
2227 security issues in continued process execution. Reducing shutdown time
2228 leads to lower overall process restart latency, so there is benefit both
2229 from a security and performance perspective.
2231 * The abort function terminates the process immediately, without flushing
2232 stdio streams. Previous glibc versions used to flush streams, resulting
2233 in deadlocks and further data corruption. This change also affects
2234 process aborts as the result of assertion failures.
2236 * On platforms where long double has the IEEE binary128 format (aarch64,
2237 alpha, mips64, riscv, s390 and sparc), the math library now implements
2238 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2239 These are the same interfaces added in version 2.26 for some platforms where
2240 this format is supported but is not the format of long double.
2242 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2243 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2244 implements interfaces for that type, as defined by ISO/IEC TS
2245 18661-3:2015. These are corresponding interfaces to those supported for
2248 * The math library now implements interfaces for the _Float32, _Float64 and
2249 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2250 corresponding interfaces to those supported for _Float128.
2252 * glibc now implements the memfd_create and mlock2 functions on Linux.
2254 * Support for memory protection keys was added. The <sys/mman.h> header now
2255 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2258 * The copy_file_range function was added.
2260 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2262 * The ldconfig utility now processes `include' directives using the C/POSIX
2263 collation ordering. Previous glibc versions used locale-specific
2264 ordering, the change might break systems that relied on that.
2266 * Support for two grammatical forms of month names has been added.
2267 In a call to strftime, the "%B" and "%b" format specifiers will now
2268 produce the grammatical form required when the month is used as part
2269 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2270 required when the month is named by itself. For instance, in Greek
2271 and in many Slavic and Baltic languages, "%B" will produce the month
2272 in genitive case, and "%OB" will produce the month in nominative case.
2274 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2275 are all valid and will all accept any known form of month
2276 name---standalone or complete, abbreviated or full. In a call to
2277 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2278 the strings used by "%B" and "%b", respectively. New query
2279 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2280 used by "%OB" and "%Ob", respectively.
2282 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2283 define the strings for %OB and %Ob, respectively; these have the
2284 same syntax as "mon" and "abmon". These arrays are optional; if they
2285 are not provided then they have the same content as "mon" and "abmon",
2288 These features are provided for locales which define "alt_mon" and/or
2289 "ab_alt_mon" in their locale source data. This release includes such
2290 alternative month name data for the following languages: Belarusian,
2291 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2293 This feature is currently a GNU extension, but it is expected to
2294 be added to the next revision of POSIX, and it is also already
2295 available on some BSD-derived operating systems.
2297 This feature will cause existing statically compiled applications
2298 to fail to load locales and fall back to the builtin C/POSIX locales.
2299 See notes below for other changes affecting compatibility.
2301 * Support for the RISC-V ISA running on Linux has been added. This port
2302 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2303 for the following ISA and ABI pairs:
2309 Deprecated and removed features, and other changes affecting compatibility:
2311 * Statically compiled applications attempting to load locales compiled for the
2312 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2313 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2314 support for two grammatical forms of the month names, also extends the locale
2315 data binary format. Static applications needing locale support must be
2316 recompiled to match the runtime and data they are deployed with. In some
2317 distributions there is an upgrade window where dynamically linked applications
2318 may use a new library but the old locale data and also fall back to the
2319 builtin C/POSIX locales; restarting the application process is sufficient to
2322 * Support for statically linked applications which call dlopen is deprecated
2323 and will be removed in a future version of glibc. Applications which call
2324 dlopen need to be linked dynamically instead.
2326 * Support for old programs which use internal stdio data structures and
2327 functions is deprecated. This includes programs which use the C++ streams
2328 provided by libstdc++ in GCC 2.95. Programs which use the internal
2329 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2330 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2331 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2332 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2333 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2334 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2335 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2336 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2337 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2338 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2339 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2340 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2341 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2342 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2343 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2344 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2345 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2346 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2347 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2348 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2349 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2350 future version of glibc. Unlike other symbol removals, these old
2351 applications will not be supported using compatibility symbols.
2353 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2354 defined by <sys/ptrace.h>.
2356 * libm no longer supports SVID error handling (calling a user-provided
2357 matherr function on error) or the _LIB_VERSION variable to control error
2358 handling. (SVID error handling and the _LIB_VERSION variable still work
2359 for binaries linked against older versions of the GNU C Library.) The
2360 libieee.a library is no longer provided. math.h no longer defines struct
2361 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2362 TLOSS, PLOSS and HUGE.
2364 * The libm functions pow10, pow10f and pow10l are no longer supported for
2365 new programs. Programs should use the standard names exp10, exp10f and
2366 exp10l for these functions instead.
2368 * The mcontext_t type is no longer the same as struct sigcontext. On
2369 platforms where it was previously the same, this changes the C++ name
2370 mangling for interfaces involving this type.
2372 * The add-ons mechanism for building additional packages at the same time as
2373 glibc has been removed. The --enable-add-ons configure option is now
2376 * The --without-fp configure option is now ignored. Whether hardware
2377 floating-point instructions are used is now configured based on whether
2378 the compiler used at configure time (without any options implied by a
2379 --with-cpu= configure option) uses such instructions.
2381 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2382 the specified string can be parsed as a domain name.
2384 * In the malloc_info output, the <heap> element may contain another <aspace>
2385 element, "subheaps", which contains the number of sub-heaps.
2387 * The libresolv function p_secstodate is no longer supported for new
2390 * The tilepro-*-linux-gnu configuration is no longer supported.
2392 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2393 and will be removed in a future release. Software that is still using
2394 either header should be updated to use standard <stdio.h> interfaces
2397 libio.h was originally the header for a set of supported GNU extensions,
2398 but they have not been maintained as such in many years, they are now
2399 standing in the way of improvements to stdio, and we don't think there are
2400 any remaining external users. _G_config.h was never intended for public
2401 use, but predates the bits convention.
2403 Changes to build and runtime requirements:
2405 * bison version 2.7 or later is required to generate code in the 'intl'
2408 Security related changes:
2410 CVE-2009-5064: The ldd script would sometimes run the program under
2411 examination directly, without preventing code execution through the
2412 dynamic linker. (The glibc project disputes that this is a security
2413 vulnerability; only trusted binaries must be examined using the ldd
2416 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2417 suffered from a one-byte overflow during ~ operator processing (either
2418 on the stack or the heap, depending on the length of the user name).
2419 Reported by Tim Rühsen.
2421 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2422 would sometimes fail to free memory allocated during ~ operator
2423 processing, leading to a memory leak and, potentially, to a denial
2426 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2427 without GLOB_NOESCAPE, could write past the end of a buffer while
2428 unescaping user names. Reported by Tim Rühsen.
2430 CVE-2017-17426: The malloc function, when called with an object size near
2431 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2432 instead of NULL. This was a regression introduced with the new malloc
2433 thread cache in glibc 2.26. Reported by Iain Buclaw.
2435 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2436 to the allocation of too much memory. (This is not a security bug per se,
2437 it is mentioned here only because of the CVE assignment.) Reported by
2440 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2441 of the number of search path components. (This is not a security
2442 vulnerability per se because no trust boundary is crossed if the fix for
2443 CVE-2017-1000366 has been applied, but it is mentioned here only because
2444 of the CVE assignment.) Reported by Qualys.
2446 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2447 for AT_SECURE or SUID binaries could be used to load libraries from the
2450 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2451 succeeds without returning an absolute path due to unexpected behaviour
2452 of the Linux kernel getcwd syscall. Reported by halfdog.
2454 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2455 an object size near the value of SIZE_MAX, would return a pointer to a
2456 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2458 CVE-2018-6551: The malloc function, when called with an object size near
2459 the value of SIZE_MAX, would return a pointer to a buffer which is too
2460 small, instead of NULL.
2462 The following bugs are resolved with this release:
2464 [866] glob: glob should match dangling symlinks
2465 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2466 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2468 [5997] math: Very slow execution of sinf function
2469 [10580] localedata: hr_HR: updated locale
2470 [10871] locale: 'mon' array should contain both nominative and genitive
2472 [12349] localedata: eu_ES: incorrect thousands separator
2473 [13605] localedata: shn_MM: new Shan locale
2474 [13805] localedata: ru_RU: currency should use ',' as radix point
2475 [13953] localedata: km_KH: locale update
2476 [13994] localedata: mjw_IN: new locale
2477 [14121] build: make writes .mo files in po directory
2478 [14333] libc: Fix the race between atexit() and exit()
2479 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2480 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2482 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2483 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2484 width Latin characters
2485 [15332] localedata: es_CU: locale update
2486 [15436] stdio: Don't close or flush stdio streams on abort
2487 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2489 [16148] localedata: ca_ES: incorrect thousands separator
2490 [16750] dynamic-link: ldd should not try to execute the binaries
2492 [16777] localedata: pl_PL: incorrect thousands separator in locale
2493 [16905] localedata: hanzi: new collation
2494 [17563] localedata: cmn_TW: add hanzi collation
2495 [17750] localedata: wrong collation order of diacritics in most locales
2496 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2498 [17956] build: Build fails on missing definitions from header file
2499 nss/nss.h when Mozilla NSS is used for cryptography
2500 [18203] libc: realpath() does not handle unreachable paths correctly
2501 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2502 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2503 [18822] libc: Internal functions are called via PLT
2504 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2505 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2506 [19574] libc: glibc should support building static PIE binaries
2507 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2509 [19971] glob: glob: Do not skip entries with zero d_ino values
2510 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2511 [20008] localedata: km_KH: convert to translit_neutral
2512 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2513 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2514 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2515 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2516 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2518 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2519 they're set, wrong errors returned by gaih_inet when lookup functions
2521 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2522 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2524 [20952] localedata: yuw_PG: new locale
2525 [21084] localedata: charmaps/IBM858: new codepage
2526 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2527 [21242] libc: assert gives pedantic warning in old gcc versions
2528 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2529 __regcall calling convention
2530 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2531 [21326] libc: C99 functions are not declared for C++11 and later if
2532 _GNU_SOURCE is not predefined by g++
2533 [21457] libc: sys/ucontext.h namespace
2534 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2535 [21660] math: GCC fails to compile a formula with tgmath.h
2536 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2537 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2538 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2539 [21684] math: tgmath.h handling of complex integers
2540 [21685] math: tgmath.h handling of bit-fields
2541 [21686] math: tgmath.h handling of __int128
2542 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2544 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2546 [21750] localedata: column width of characters incompatible with classical
2548 [21754] malloc: malloc: Perform as little work as possible after heap
2549 consistency check failures
2550 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2551 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2552 [21791] string: Unused XXX_chk_XXX functions in libc.a
2553 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2555 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2557 [21845] localedata: Added new Locale bho_NP
2558 [21853] localedata: Fix abday Which looks same as day in zh_SG
2559 [21854] localedata: Added New Locale en_SC
2560 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2561 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2562 _dl_runtime_resolve_avx_slow
2563 [21885] network: getaddrinfo: gethosts does not release resolver context
2564 on memory allocation failure
2565 [21899] libc: XPG4.2 sigaction namespace
2566 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2568 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2570 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2571 errno value, causing getaddrinfo to fail
2572 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2573 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2574 instead of EAI_NODATA
2575 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2576 constant PTRACE_SEIZE_DEVEL
2577 [21930] math: C-only gcc builtins used in <math.h> isinf
2578 [21932] network: Unpaired __resolv_context_get in generic get*_r
2580 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2581 [21944] libc: sigval namespace
2582 [21951] localedata: Update hanzi collation by stroke
2583 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2584 sysdeps/x86_64/fpu/e_expf.S
2585 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2586 allocation in syscall loops)
2587 [21959] localedata: Fix Country name for xh_ZA
2588 [21960] localedata: Fix abmon for bem_ZM
2589 [21966] math: AVX2 mathvec functions use FMA without checking
2590 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2591 [21971] localedata: Added New Locale for mfe_MU
2592 [21972] libc: assert macro requires operator== (int) for its argument type
2593 [21973] math: [sparc] libm missing sqrtl compat symbol
2594 [21974] libc: Remove __bb_init_func and __bb_exit_func
2595 [21982] string: stratcliff.c: error: assuming signed overflow does not
2597 [21986] stdio: __guess_grouping is called incorrectly
2598 [21987] math: [sparc32] wrong bits/long-double.h installed
2599 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2601 [22022] localedata: Missing country_name for mni_IN
2602 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2604 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2606 [22026] locale: iconv_open: heap overflow on gconv_init failure
2607 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2608 [22035] math: [m68k] bits/math-inline.h macro namespace
2609 [22038] localedata: Fix abbreviated weeks and months for Somali
2610 [22044] localedata: Remove redundant data for Limburgish Language
2611 [22050] malloc: Linking with -lmcheck does not hook
2612 __malloc_initialize_hook correctly
2613 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2614 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2615 [22070] localedata: charmaps/UTF-8: wcwidth for
2616 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2617 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2618 Jungseong and Jongseong) should be 0
2619 [22078] nss: nss_files performance issue in multi mode
2620 [22082] math: bits/math-finite.h exp10 condition
2621 [22086] libc: pcprofiledump incorrect cross-endian condition
2622 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2623 [22095] network: Name server address allocation memory leak in resolv.conf
2625 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2627 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2628 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2630 [22111] malloc: malloc: per thread cache is not returned when thread exits
2631 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2632 [22134] libc: [linux] implement fexecve with execveat
2633 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2635 [22145] libc: ttyname() gives up too early in the face of namespaces
2636 [22146] math: C++ build issue with float128 on x86_64
2637 [22153] nptl: nptl: save error code before process termination
2638 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2639 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2640 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2641 [22165] libc: [hppa] Text relocations in libc.so
2642 [22180] libc: destructor registered via __cxa_atexit is called twice
2643 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2644 symlinks") cause "make" segfaults
2645 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2647 [22207] libc: FAIL: stdlib/test-atexit-race
2648 [22225] math: nearbyint arithmetic moved before feholdexcept
2649 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2650 [22235] math: iscanonical in C++ and float128
2651 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2652 the svid compat wrapper
2653 [22244] math: ynf and yn are wrong without the svid compat wrapper
2654 [22273] libc: Improper assert in Linux posix_spawn implementation
2655 [22284] libc: -pg -pie doesn't work
2656 [22292] locale: localedef exits with error 4 when it should be error 1
2657 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2658 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2660 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2661 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2663 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2664 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2665 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2666 [22322] libc: [mips64] wrong bits/long-double.h installed
2667 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2668 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2670 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2671 [22343] malloc: Integer overflow in posix_memalign
2672 [22347] libc: getrandom() returns the number of bytes that were copied to
2673 the buffer even though the comments say "Return 0 on success and -1 on
2675 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2676 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2678 [22370] dynamic-link: Incorrect note padding check
2679 [22375] libc: malloc returns pointer from tcache_get when should return
2680 NULL (CVE-2017-17426)
2681 [22377] math: iseqsig, float128 and C++
2682 [22382] localedata: Error in tpi_PG locale
2683 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2684 inside the ASCII printable range
2685 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2687 [22403] localedata: Slash needs escaping in some locales
2688 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2689 [22409] network: res_hnok does not accept some host names used on the
2691 [22412] network: res_dnok, res_hnok should perform syntax checks
2692 [22413] network: ns_name_pton ignores syntactically invalid trailing
2694 [22415] stdio: setvbuf can lead to invalid free/segfault
2695 [22432] build: Non-deterministic build
2696 [22439] malloc: malloc_info should compute summary statistics for all sub-
2698 [22442] network: if_nametoindex could report index for the wrong
2699 networking interface
2700 [22446] build: aliasing violation calling readlink in handle_request
2701 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2702 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2703 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2704 __nscd_hash/__nss_hash
2705 [22463] network: p_secstodate overflow handling
2706 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2707 [22478] libc: sigwait can fail with EINTR
2708 [22505] libc: ldconfig processes include directive in locale-specific
2710 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2711 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2712 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2713 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2714 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2715 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2716 same as for Croatian
2717 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2718 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2719 [22577] libc: missing newline after "cannot allocate TLS data structures
2721 [22588] manual: manual/conf.texi: missing underscore in front of
2723 [22593] math: nextafter and nexttoward are declared with const attribute
2724 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2725 [22603] string: ia64 memchr overflows internal pointer check
2726 [22605] libc: SH clone does not set the exit code correctly
2727 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2729 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2730 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2731 modified in case of success
2732 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2733 [22615] manual: manual: ambiguous wording about errno value in case of
2735 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2737 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2738 binaries or if /proc is not mounted (CVE-2017-16997)
2739 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2740 [22630] build: $(no-pie-ldflag) is no longer effective
2741 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2742 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2743 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2744 [22637] nptl: guard size is subtracted from thread stack size instead of
2746 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2747 [22657] localedata: hu_HU: Avoid double space in date
2748 [22660] math: fmax, fmin sNaN handling on alpha
2749 [22664] libc: New warning of GCC8
2750 [22665] math: alpha: ceil and floor raise inexact exceptions
2751 [22666] math: alpha: trunc raise inexact exceptions
2752 [22667] libc: makecontext lacks stack alignment on i386
2753 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2754 [22679] libc: getcwd(3) can succeed without returning an absolute path
2756 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2757 elision and tunables
2758 [22687] math: [powerpc-nofpu] complex long double functions spurious
2760 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2761 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2762 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2764 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2765 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2767 [22701] nis: Incomplete removal of libnsl
2768 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2769 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2770 [22715] dynamic-link: FAIL: elf/tst-audit10
2771 [22719] libc: Backtrace tests fail on hppa
2772 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2773 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2774 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2775 before the first call to crypt_r () in crypt/badsalttest.c
2782 * A per-thread cache has been added to malloc. Access to the cache requires
2783 no locks and therefore significantly accelerates the fast path to allocate
2784 and free small amounts of memory. Refilling an empty cache requires locking
2785 the underlying arena. Performance measurements show significant gains in a
2786 wide variety of user workloads. Workloads were captured using a special
2787 instrumented malloc and analyzed with a malloc simulator. Contributed by
2788 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2790 * Unicode 10.0.0 Support: Character encoding, character type info, and
2791 transliteration tables are all updated to Unicode 10.0.0, using
2792 generator scripts contributed by Mike FABIAN (Red Hat).
2793 These updates cause user visible changes, especially the changes in
2794 wcwidth for many emoji characters cause problems when emoji sequences
2795 are rendered with pango, see for example:
2796 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2798 * Collation of Hungarian has been overhauled and is now consistent with "The
2799 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2802 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2804 - The GNU C Library will now detect when /etc/resolv.conf has been
2805 modified and reload the changed configuration. The new resolver option
2806 “no-reload” (RES_NORELOAD) disables this behavior.
2808 - The GNU C Library now supports an arbitrary number of search domains
2809 (configured using the “search” directive in /etc/resolv.conf);
2810 previously, there was a hard limit of six domains. For backward
2811 compatibility, applications that directly modify the ‘_res’ global
2812 object are still limited to six search domains.
2814 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2815 Library will now randomly pick a name server from the configuration as a
2816 starting point. (Previously, the second name server was always used.)
2818 * The tunables feature is now enabled by default. This allows users to tweak
2819 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2821 * New function reallocarray, which resizes an allocated block (like realloc)
2822 to the product of two sizes, with a guaranteed clean failure upon integer
2823 overflow in the multiplication. Originally from OpenBSD, contributed by
2824 Dennis Wölfing and Rüdiger Sonderfeld.
2826 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2827 These are extended versions of preadv and pwritev, respectively, taking an
2828 additional flags argument. The set of supported flags depends on the
2829 running kernel; full support currently requires kernel 4.7 or later.
2831 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2832 create a new session ID for the spawned process. This feature is
2833 scheduled to be added to the next major revision of POSIX; for the time
2834 being, it is available under _GNU_SOURCE.
2836 * errno.h is now safe to use from C-preprocessed assembly language on all
2837 supported operating systems. In this context, it will only define the
2838 Exxxx constants, as preprocessor macros expanding to integer literals.
2840 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2841 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2842 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2843 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2845 To compile programs that use this feature, the compiler must support
2846 128-bit floating point with the type name _Float128 (as defined by TS
2847 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2848 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2849 must be defined to make the new interfaces visible.
2851 The new functions and macros correspond to those present for other
2852 floating-point types (except for a few obsolescent interfaces not
2853 supported for the new type), with F128 or f128 suffixes; for example,
2854 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2855 printf or scanf formats for the new type; the strfromf128 and strtof128
2856 interfaces should be used instead.
2858 Deprecated and removed features, and other changes affecting compatibility:
2860 * The synchronization that pthread_spin_unlock performs has been changed to
2861 now be equivalent to a C11 atomic store with release memory order to the
2862 spin lock's memory location. Previously, several (but not all)
2863 architectures used stronger synchronization (e.g., containing what is
2864 often called a full barrier). This change can improve performance, but
2865 may affect odd fringe uses of spin locks that depend on the previous
2866 behavior (e.g., using spin locks as atomic variables to try to implement
2867 Dekker's mutual exclusion algorithm).
2869 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2872 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2873 will only be built and installed when the GNU C Library is configured with
2874 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2875 as TIRPC or rpcsvc-proto, to be used.
2877 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2878 libnss_compat, are deprecated, and will not be built or installed by
2881 The NIS(+) support library, libnsl, is also deprecated. By default, a
2882 compatibility shared library will be built and installed, but not headers
2883 or development libraries. Only a few NIS-related programs require this
2884 library. (In particular, the GNU C Library has never required programs
2885 that use 'gethostbyname' to be linked with libnsl.)
2887 Replacement implementations based on TIRPC, which additionally support
2888 IPv6, are available from <https://github.com/thkukuk/>. The configure
2889 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2890 name service modules, to be built and installed.
2892 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2893 support is enabled, the configured recursive resolver must support EDNS.
2894 (Responding to EDNS-enabled queries with responses which are not
2895 EDNS-enabled is fine, but FORMERR responses are not.)
2897 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2898 servers have not supported this opcode for a long time.
2900 * The _res_opcodes variable has been removed from libresolv. It had been
2901 exported by accident.
2903 * <string.h> no longer includes inline versions of any string functions,
2904 as this kind of optimization is better done by the compiler. The macros
2905 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2907 * The nonstandard header <xlocale.h> has been removed. Most programs should
2908 use <locale.h> instead. If you have a specific need for the definition of
2909 locale_t with no other declarations, please contact
2910 libc-alpha@sourceware.org and explain.
2912 * The obsolete header <sys/ultrasound.h> has been removed.
2914 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2916 * The obsolete function cfree has been removed. Applications should use
2919 * The stack_t type no longer has the name struct sigaltstack. This changes
2920 the C++ name mangling for interfaces involving this type.
2922 * The ucontext_t type no longer has the name struct ucontext. This changes
2923 the C++ name mangling for interfaces involving this type.
2925 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2926 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2927 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2928 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2929 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2930 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2931 fpregset_t type no longer has the name struct fpu. This changes the C++
2932 name mangling for interfaces involving those types.
2934 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2935 synced with the kernel:
2937 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2938 are not supported on this architecture and have been removed.
2940 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2941 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2942 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2944 Programs that assume the GET/SETREGS ptrace requests are universally
2945 available will now fail to build, instead of malfunctioning at runtime.
2947 Changes to build and runtime requirements:
2949 * Linux kernel 3.2 or later is required at runtime, on all architectures
2950 supported by that kernel. (This is a change from version 2.25 only for
2953 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2955 * On most architectures, GCC 4.9 or later is required to build the GNU C
2956 Library. On powerpc64le, GCC 6.2 or later is required.
2958 Older GCC versions and non-GNU compilers are still supported when
2959 compiling programs that use the GNU C Library. (We do not know exactly
2960 how old, and some GNU extensions to C may be _de facto_ required. If you
2961 are interested in helping us make this statement less vague, please
2962 contact libc-alpha@sourceware.org.)
2964 Security related changes:
2966 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2967 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2969 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2970 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2972 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2973 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2976 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2977 fixed (CVE-2017-12133).
2979 The following bugs are resolved with this release:
2981 [984] network: Respond to changed resolv.conf in gethostbyname
2982 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2983 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2985 [12189] libc: __stack_chk_fail should not attempt a backtrace
2987 [14096] time: Race condition on timezone/tst-timezone.out
2988 [14172] localedata: az_IR: new locale
2989 [14995] build: glibc fails to build if gold is the default linker, even if
2991 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2992 [16637] network: inet_pton function is accepting IPv6 with bad format
2993 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2994 x86 and other generic code
2995 [16875] localedata: ko_KR: fix lang_name
2996 [17225] localedata: ar_SY: localized month names for May and June are
2998 [17297] localedata: da_DK: wrong date_fmt string
2999 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3000 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3001 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3002 [19066] localedata: ar_SA abbreviated day and month names are in English
3003 [19569] network: resolv: Support an arbitrary number of search domains
3004 [19570] network: Implement random DNS server selection in the stub
3006 [19838] locale: localedef fails on PA-RISC
3007 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3008 order of 0D36 and 0D37
3009 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3011 [20098] libc: FAIL: debug/backtrace-tst on hppa
3012 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3014 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3016 [20313] localedata: Update locale data to Unicode 9.0
3017 [20424] manual: Document how to provide a malloc replacement
3018 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3020 [20686] locale: Add el_GR@euro to SUPPORTED.
3021 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3022 failures consistently
3023 [21015] dynamic-link: Document and fix --enable-bind-now
3024 [21016] nptl: pthread_cond support is broken on hppa
3025 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3026 frame-pointer on i386
3027 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3029 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3030 [21088] libc: Build fails with --enable-static-nss
3031 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3032 generic c code is used
3033 [21109] libc: Tunables broken on big-endian
3034 [21112] math: powf has large ulp errors with base close to 1 and exponent
3036 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3038 [21120] malloc: glibc malloc is incompatible with GCC 7
3039 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3041 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3042 (-0.0) when linking with -lieee
3043 [21171] math: log10, log2 and lgamma return incorrect results
3044 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3045 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3046 [21207] localedata: ce_RU: update weekdays from CLDR
3047 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3048 [21217] localedata: Update months from CLDR-31
3049 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3050 [21243] libc: support_delete_temp_file should issue warning for failed
3052 [21244] libc: support resolv_test_start() socket fd close should be
3054 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3055 new posix_spawn implementation
3056 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3057 leads to lower CPU frequency
3058 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3059 [21261] libc: [sparc64] bits/setjmp.h namespace
3060 [21267] network: [mips] bits/socket.h IOC* namespace
3061 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3062 [21270] libc: mmap64 silently truncates large offset values
3063 [21275] libc: posix_spawn always crashes on ia64 now
3064 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3065 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3066 [21289] libc: Incorrect declaration for 32-bit platforms with
3067 _FILE_OFFSET_BITS=64 causes build error
3068 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3069 not support gethostbyname4_r
3070 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3072 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3074 [21340] libc: Support POSIX_SPAWN_SETSID
3075 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3076 [21359] network: ns_name_pack needs additional byte in destination buffer
3077 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3078 against fragmentation attacks (CVE-2017-12132)
3079 [21369] network: resolv: Remove EDNS fallback
3080 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3082 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3083 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3084 [21393] stdio: Missing dup3 error check in freopen, freopen64
3085 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3086 [21399] localedata: Bad description for U00EC in
3087 localedata/charmaps/CP1254
3088 [21411] malloc: realloc documentation error
3089 [21426] network: sys/socket.h uio.h namespace
3090 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3091 [21445] libc: signal.h bsd_signal namespace
3092 [21455] network: Network headers stdint.h namespace
3093 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3095 [21475] network: resolv: Overlong search path is truncated mid-label
3096 [21511] libc: sigstack namespace
3097 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3098 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3099 bits/syscall.h: No such file or directory
3100 [21517] libc: struct sigaltstack namespace
3101 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3102 [21533] localedata: Update locale data to Unicode 10.0
3104 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3105 junk at end of line, first unrecognized character is `@'
3106 [21538] libc: SIG_HOLD missing for XPG4
3107 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3108 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3109 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3110 [21543] libc: sigevent namespace
3111 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3112 size for general purpose registers in mcontext_t structure
3113 [21550] libc: sigwait namespace
3114 [21552] libc: XPG4 bsd_signal namespace
3115 [21554] libc: sigpause namespace
3116 [21560] libc: sys/wait.h signal.h namespace
3117 [21561] libc: waitid namespace
3118 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3119 '/usr/include/stdlib.h': Permission denied
3120 [21575] libc: sys/wait.h missing struct rusage definition
3121 [21584] libc: sigaltstack etc namespace
3122 [21597] libc: siginterrupt namespace
3123 [21607] math: hppa: FAIL: math/test-tgmath
3124 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3126 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3127 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3128 stack and heap (CVE-2017-1000366)
3129 [21625] libc: wait3 namespace
3130 [21654] nss: Incorrect pointer alignment in NSS group merge result
3132 [21657] network: Parse interface zone id for node-local multicast
3133 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3135 [21666] libc: .symver is used on common symbol
3136 [21668] network: resolv: res_init cross-thread broadcast introduces race
3138 [21687] math: tgmath.h totalorder, totalordermag return type
3139 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3141 [21696] libc: Incorrect assumption of of __cpu_mask in
3142 posix/sched_cpucount.c
3143 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3144 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3146 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3147 leading to relocation crash
3148 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3149 `resolv_conf_matches (resp, conf)' failed.
3150 [21710] localedata: Added Samoan language locale for Samoa
3151 [21711] localedata: Pashto yesstr/nostr locale are missing
3152 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3153 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3154 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3155 [21723] localedata: yesstr/nostr missing for Chinese language locale
3156 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3158 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3160 [21728] localedata: New Locale for Tongan language
3161 [21729] localedata: incorrect LC_NAME fields for hi_IN
3162 [21733] localedata: yesstr and nostr are missing for zh_HK
3163 [21734] localedata: Missing yesstr and nostr are for kw_GB
3164 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3165 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3166 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3167 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3169 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3171 [21749] localedata: Wrong abbreviated day name (“abday”) for
3173 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3174 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3175 [21759] localedata: missing yesstr and nostr for Tigrinya
3176 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3177 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3178 [21767] localedata: Missing Bislama locales
3179 [21768] localedata: Missing yesstr and nostr for aa_ET
3180 [21770] localedata: Missing Field in li_NL
3181 [21778] nptl: Robust mutex may deadlock
3182 [21779] libc: MicroBlaze segfaults when loading libpthread
3183 [21783] localedata: Fix int_select international_call_prefixes
3184 [21784] localedata: Inconsistency in country_isbn
3185 [21788] localedata: Missing Country Postal Abbreviations
3186 [21794] localedata: Added-country_isbn-for-Italy
3187 [21795] localedata: Add/Fix country_isbn for France
3188 [21796] localedata: Added country_isbn for Republic of Korea
3189 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3190 [21799] localedata: Added int_select international_call_prefixes
3191 [21801] localedata: Added int_select international_call_prefixes
3192 [21804] nptl: Double semicolon in thread-shared-types.h
3193 [21807] localedata: LC_ADDRESS fix for pap_CW
3194 [21808] localedata: Fix LC_ADDRESS for pap_AW
3195 [21821] localedata: Added country_name in mai_IN
3196 [21822] localedata: Fix LC_TIME for mai_IN
3197 [21823] localedata: missing yesstr, nostr for sa_IN
3198 [21825] localedata: Fix name_mrs for mag_IN
3199 [21828] localedata: 2.26 changelog should mention user visible changes
3201 [21835] localedata: Added Maithili language locale for Nepal
3202 [21838] localedata: Removed redundant data for the_NP
3203 [21839] localedata: Fix LC_MONETARY for ta_LK
3204 [21844] localedata: Fix Latin characters and Months Sequence.
3205 [21848] localedata: Fix mai_NP Title Name
3210 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3211 24731-2:2010, is supported to enable declarations of functions from that
3212 TR. Note that not all functions from that TR are supported by the GNU C
3215 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3216 18661-1:2014, is supported to enable declarations of functions and macros
3217 from that TS. Note that not all features from that TS are supported by
3220 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3221 18661-4:2015, is supported to enable declarations of functions and macros
3222 from that TS. Note that most features from that TS are not supported by
3225 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3226 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3227 Since the GNU C Library defaults to a much newer revision of POSIX, this
3228 will only affect programs that specifically request an old conformance
3229 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3230 see a change in the visible declarations, but a program compiled with
3231 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3234 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3235 defined by all multithreaded code, but glibc has not required this for
3238 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3239 means that in a future release, the macros “major”, “minor”, and “makedev”
3240 will only be available from <sys/sysmacros.h>.
3242 These macros are not part of POSIX nor XSI, and their names frequently
3243 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3244 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3245 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3248 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3249 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3250 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3252 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3253 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3254 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3255 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3256 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3257 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3258 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3259 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3260 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3261 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3262 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3265 * New <math.h> features are added from TS 18661-1:2014:
3267 - Signaling NaN macros: SNANF, SNAN, SNANL.
3269 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3270 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3271 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3273 - llogb functions: the llogb, llogbf and llogbl functions, and the
3274 FP_LLOGB0 and FP_LLOGBNAN macros.
3276 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3279 - Comparison macros: iseqsig.
3281 - Classification macros: iscanonical, issubnormal, iszero.
3283 - Total order functions: totalorder, totalorderf, totalorderl,
3284 totalordermag, totalordermagf, totalordermagl.
3286 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3288 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3289 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3291 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3292 are added to libc. They convert a floating-point number into string.
3294 * Most of glibc can now be built with the stack smashing protector enabled.
3295 It is recommended to build glibc with --enable-stack-protector=strong.
3296 Implemented by Nick Alcock (Oracle).
3298 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3299 intended to be used instead of memset() to erase sensitive data after use;
3300 the compiler will not optimize out calls to explicit_bzero even if they
3301 are "unnecessary" (in the sense that no _correct_ program can observe the
3302 effects of the memory clear).
3304 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3305 to float instead of double. This does not affect the ABI of any libraries
3306 that are part of the GNU C Library, but may affect the ABI of other
3307 libraries that use this type in their interfaces.
3309 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3310 float_t and double_t types are now defined to long double instead of float
3311 and double. These options are not the default, and this does not affect
3312 the ABI of any libraries that are part of the GNU C Library, but it may
3313 affect the ABI of other libraries that use this type in their interfaces,
3314 if they are compiled or used with those options.
3316 * The getentropy and getrandom functions, and the <sys/random.h> header file
3319 * The buffer size for byte-oriented stdio streams is now limited to 8192
3320 bytes by default. Previously, on Linux, the default buffer size on most
3321 file systems was 4096 bytes (and thus remains unchanged), except on
3322 network file systems, where the buffer size was unpredictable and could be
3323 as large as several megabytes.
3325 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3326 for the Linux quota interface which predates kernel version 2.4.22 has
3329 * The malloc_get_state and malloc_set_state functions have been removed.
3330 Already-existing binaries that dynamically link to these functions will
3331 get a hidden implementation in which malloc_get_state is a stub. As far
3332 as we know, these functions are used only by GNU Emacs and this change
3333 will not adversely affect already-built Emacs executables. Any undumped
3334 Emacs executables, which normally exist only during an Emacs build, should
3335 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3337 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3338 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3339 “no-ip6-dotint” had already been the default, and support for the
3340 “ip6-dotint” option was removed from the Internet in 2006.
3342 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3343 flag from <resolv.h> have been removed. The option relied on a
3344 backwards-incompatible DNS extension which was never deployed on the
3347 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3348 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3349 They were already unimplemented.
3351 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3352 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3353 removed again from the IETF name lookup interface specification in RFC
3354 2553. Applications should use getaddrinfo instead.
3356 * DNSSEC-related declarations and definitions have been removed from the
3357 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3358 decode the data part of DNSSEC record types. Previous versions of glibc
3359 only implemented minimal support for the previous version of DNSSEC, which
3360 is incompatible with the currently deployed version.
3362 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3363 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3364 <arpa/nameser.h> header file because the distinction between RR types and
3365 meta-RR types is not officially standardized, subject to revision, and
3366 thus not suitable for encoding in a macro.
3368 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3369 and rhook members of the res_state type in <resolv.h> have been removed.
3370 The glibc stub resolver did not support these hooks, but the header file
3371 did not reflect that.
3373 * For multi-arch support it is recommended to use a GCC which has
3374 been built with support for GNU indirect functions. This ensures
3375 that correct debugging information is generated for functions
3376 selected by IFUNC resolvers. This support can either be enabled by
3377 configuring GCC with '--enable-gnu-indirect-function', or by
3378 enabling it by default by setting 'default_gnu_indirect_function'
3379 variable for a particular architecture in the GCC source file
3382 * GDB pretty printers have been added for mutex and condition variable
3383 structures in POSIX Threads. When installed and loaded in gdb these pretty
3384 printers show various pthread variables in human-readable form when read
3385 using the 'print' or 'display' commands in gdb.
3387 * Tunables feature added to allow tweaking of the runtime for an application
3388 program. This feature can be enabled with the '--enable-tunables' configure
3389 flag. The GNU C Library manual has details on usage and README.tunables has
3390 instructions on adding new tunables to the library.
3392 * A new version of condition variables functions have been implemented in
3393 the NPTL implementation of POSIX Threads to provide stronger ordering
3396 * A new version of pthread_rwlock functions have been implemented to use a more
3397 scalable algorithm primarily through not using a critical section anymore to
3400 Security related changes:
3402 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3403 have been created with makecontext could fail to terminate due to a
3404 missing .cantunwind annotation. This has been observed to lead to a hang
3405 (denial of service) in some Go applications compiled with gccgo. Reported
3406 by Andreas Schwab. (CVE-2016-6323)
3408 * The DNS stub resolver functions would crash due to a NULL pointer
3409 dereference when processing a query with a valid DNS question type which
3410 was used internally in the implementation. The stub resolver now uses a
3411 question type which is outside the range of valid question type values.
3414 The following bugs are resolved with this release:
3416 [4099] stdio: Overly aggressive caching by stream i/o functions.
3417 [7065] build: Support building glibc with -fstack-protector or -fstack-
3419 [9842] localedata: en_CA: incorrect date format
3420 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3421 before it started waiting
3422 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3423 [15765] nptl: sem_open is wrongly a cancellation point
3424 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3425 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3427 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3428 library linked with pthread
3429 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3430 "FIXME: Ingo" issue)
3431 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3432 [17252] libc: getrandom and getentropy syscall
3433 [17730] malloc: thread-local storage is sometimes improperly free()'d
3434 after being __libc_memalign()'d
3435 [18241] stdio: failed fseek on memstream does not set errno and can fail
3437 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3439 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3440 PTHREAD_PRIO_INHERIT mutex on ARM
3441 [18784] network: res_query and related function crash for special record
3442 type queries (CVE-2015-5180)
3443 [19380] math: strtod does not raise "inexact"
3444 [19387] string: Integer overflow in memchr
3445 [19390] string: Integer overflow in strncat
3446 [19398] build: linknamespace tests fail with massively parallel build
3447 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3449 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3450 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3451 [19514] libc: [PATCH] Fix spelling errors in spelling
3452 "implement"/"implementation" in several places
3453 [19582] network: Deprecate RES_USE_INET6
3454 [19673] manual: clog10 docs appear to be erroneous
3455 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3456 causes a segmentation fault
3457 [19826] libc: invalid pointer returned from __tls_get_addr with static
3459 [20016] network: resolv: Remove hooks support from the API
3460 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3462 [20033] math: [x86_64] vectorized math function don't call the __finite
3464 [20116] nptl: use after free in pthread_create
3465 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3466 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3468 [20311] nptl: please install proc_service.h
3469 [20366] libc: Compilation errors in installed headers in strict-compliance
3471 [20370] malloc: malloc: Arena free list management is still racy
3472 (incorrect fix in bug 19243)
3473 [20386] libc: assert (X = 0) does not result in GCC warning
3474 [20432] malloc: malloc: Minimize interface required for interposition
3475 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3476 in _Unwind_Backtrace (CVE-2016-6323)
3477 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3478 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3480 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3481 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3482 [20477] network: resolv: incorrect double-checked locking related to
3484 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3486 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3488 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3489 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3490 cause transition penalty
3491 [20517] math: sparcv9 missing fdiml compat symbol
3492 [20524] manual: strverscmp is inconsistent
3493 [20525] libc: <sys/quota.h> should be based on kernel headers
3494 [20539] math: GCC 7 -static -lm fails to link at -O3
3495 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3497 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3499 [20591] network: Remove obsolete DNSSEC support
3500 [20592] network: DNS resource record type classification macros in
3501 <arpa/nameser.h> are incorrect
3502 [20593] network: Update DNS RR type definitions
3503 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3504 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3506 [20629] network: libresolv: Remove support for bitstring labels
3508 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3509 assertion: "maxidx >= 2"
3510 [20660] math: [arm] Use VSQRT
3511 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3512 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3513 [20689] libc: Test for FMA should also check for AVX.
3514 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3515 [20715] math: iszero macro breaks existing code
3516 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3517 [20728] libc: powerpc: Missing TOC stub in clone
3518 [20729] build: glibc-2.24 fails to build for i486 with -Os
3519 [20750] build: Build fails with default PIE enabled gcc-6.x
3520 [20768] math: [alpha] sqrt fegetenv namespace
3521 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3523 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3524 __FLT_EVAL_METHOD__ is 2
3525 [20790] network: rpcgen buffer overrun in get_prog_declaration
3526 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3527 [20829] libc: crypt snprintf namespace
3528 [20847] libc: tst-vfork3 failure
3529 [20855] math: Default bits/mathdef.h has inappropriate float_t
3530 [20859] math: [sh4] FP_ILOGB0 invalid
3531 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3532 U+20AC), not same as GBK
3533 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3534 [20916] math: pow handling of sNaN arguments
3535 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3536 [20919] math: Bad pow (qNaN, 0) result with -lieee
3537 [20940] math: hypot sNaN handling
3538 [20947] math: fmax, fmin sNaN handling
3539 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3540 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3542 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3543 [20973] nptl: robust mutexes: Lost wake-ups
3544 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3545 [20978] nis: strlen on null pointer in nss_nisplus
3546 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3548 [21014] string: i686 memchr overflows internal pointer check
3549 [21019] libc: [mips] n32 lseek incorrect on overflow
3550 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3551 [21026] libc: [MIPS] readahead syscall is broken on n64
3552 [21028] math: Fallback fesetexceptflag should always succeed
3553 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3554 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3556 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3557 [21061] librt: [microblaze] librt lost clock_* exports
3558 [21073] libc: tunables: insecure environment variables passed to
3559 subprocesses with AT_SECURE
3560 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3564 * The minimum Linux kernel version that this version of the GNU C Library
3565 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3566 kernel version 2.6.32 or later suffices (on architectures that already
3567 required kernel versions more recent than 3.2, those requirements remain
3568 unchanged). Linux 3.2 or later kernel headers are required on all
3571 * The pap_AN locale has been deleted. This has been deprecated for a long
3572 time. It has been replaced by pap_AW & pap_CW, both of which have long
3573 been included in previous releases.
3575 * The readdir_r and readdir64_r functions have been deprecated. It is
3576 recommended to use readdir and readdir64 instead.
3578 * The type “union wait” has been removed. It was deprecated in the early
3579 1990s and never part of POSIX. Application code should use the int type
3580 instead of “union wait”.
3582 * A new NSS action is added to facilitate large distributed system
3583 administration. The action, MERGE, allows remote user stores like LDAP
3584 to be merged into local user stores like /etc/groups in order to provide
3585 easy to use, updated, and managed sets of merged credentials. The new
3586 action can be used by configuring it in /etc/nsswitch.conf:
3587 group: files [SUCCESS=merge] nis
3588 Implemented by Stephen Gallagher (Red Hat).
3590 * The deprecated __malloc_initialize_hook variable has been removed from the
3593 * The long unused localedef --old-style option has been removed. It hasn't
3594 done anything in over 16 years. Scripts using this option can safely
3597 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3598 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3599 return the next representable value in the direction of positive infinity
3600 and the nextdown functions return the next representable value in the
3601 direction of negative infinity. These are currently enabled as GNU
3604 Security related changes:
3606 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3607 could result in a stack overflow when getnetbyname was called with an
3608 overly long name. (CVE-2016-3075)
3610 * Previously, getaddrinfo copied large amounts of address data to the stack,
3611 even after the fix for CVE-2013-4458 has been applied, potentially
3612 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3613 instead. Reported by Michael Petlan. (CVE-2016-3706)
3615 * The glob function suffered from a stack-based buffer overflow when it was
3616 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3617 Reported by Alexander Cherepanov. (CVE-2016-1234)
3619 * The Sun RPC UDP client could exhaust all available stack space when
3620 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3621 alloca plugin for GCC. (CVE-2016-4429)
3623 * The IPv6 name server management code in libresolv could result in a memory
3624 leak for each thread which is created, performs a failing naming lookup,
3625 and exits. Over time, this could result in a denial of service due to
3626 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3628 The following bugs are resolved with this release:
3630 [1170] localedata: ne_NP: update Nepali locale definition file
3631 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3633 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3634 [6796] math: fdim() does not set errno on overflow
3635 [10354] libc: posix_spawn should use vfork() in more cases than presently
3636 [11213] localedata: localedata: add copyright disclaimer to locale files
3637 [12143] localedata: chr_US: new Cherokee locale
3638 [12450] localedata: sgs_LT: new locale
3639 [12676] localedata: ln_CD: new locale
3640 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3642 [13304] math: fma, fmaf, fmal produce wrong results
3643 [14259] build: --localedir arg to configure is ignored
3644 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3645 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3646 [14934] localedata: es_CL: wrong first weekday chilean locale
3647 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3649 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3651 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3652 [15368] nptl: raise() is not async-signal-safe
3653 [15479] math: ceil, floor, round and trunc raise inexact exception
3654 [15578] localedata: kk_KZ: various updates
3655 [16003] localedata: pap_AN: punt old locale
3656 [16137] localedata: iw_IL: punt old locale
3657 [16190] localedata: eo: new esperanto locale
3658 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3659 [16742] malloc: race condition: pthread_atfork() called before first
3660 malloc() results in unexpected locking behaviour/deadlocks
3661 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3663 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3664 [17565] localedata: pt_PT: wrong (work-)week start
3665 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3666 [17950] build: Build fails with -msse
3667 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3668 [18433] libc: posix_spawn does not return correctly upon failure to
3670 [18453] localedata: charmaps/IBM875: incorrect codes
3671 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3673 [18896] localedata: he_IL: improvements for currency
3674 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3675 Romanian locale data
3676 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3678 [19056] libc: Deprecate readdir_r
3679 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3681 [19198] localedata: nl_NL: small improvements for Dutch locales
3682 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3683 nameservers (CVE-2016-5417)
3684 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3686 [19400] locale: Language missing in "iso-639.def", trivial fix in
3688 [19431] malloc: Deadlock between fflush, getdelim, and fork
3689 [19505] libc: Incorrect file descriptor validity checks in
3690 posix_spawn_file_actions_add{open,close,dup2}
3691 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3692 when using RTLD_NEXT
3693 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3694 `intl/{gettextP,loadinfo}.h'
3695 [19534] libc: execle, execlp may use malloc
3696 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3697 [19573] network: res_nclose and __res_maybe_init disagree about name
3698 server initialization, breaking Hesiod
3699 [19575] localedata: Status of GB18030 tables
3700 [19581] localedata: sr_* date_fmt string contains additional newline
3701 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3703 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3704 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3705 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3706 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3708 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3710 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3712 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3713 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3714 [19633] locale: strfmon_l applies global locale to number formatting
3715 [19642] network: Memory leak in getnameinfo
3716 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3717 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3719 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3720 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3722 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3723 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3725 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3727 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3729 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3730 pointers and lengths in error-case.
3731 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3732 report errors on UTF-16 surrogates values.
3733 [19755] nscd: nscd assertion failure in gc
3734 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3735 [19759] libc: mempcpy shouldn't be inlined
3736 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3737 [19765] libc: s390 needs an optimized mempcpy
3738 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3739 NAME_MAX limit assumption (CVE-2016-1234)
3740 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3741 [19787] network: Missing and incorrect truncation checks in getnameinfo
3742 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3744 [19791] network: Assertion failure in res_query.c with un-connectable name
3746 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3747 [19822] math: libm.so install clobbers old version
3748 [19825] network: resolv: send_vc can return uninitialized data in second
3749 response to getaddrinfo
3750 [19830] network: nss_dns: should check RDATA length against buffer length
3751 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3752 confronted with A/AAAA records of invalid size
3753 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3754 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3755 [19853] stdio: Printing IBM long double in decimal with high precision is
3757 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3758 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3759 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3761 [19865] network: Assertion failure or memory leak in
3762 _nss_dns_getcanonname_r
3763 [19868] network: nss_dns: netent code does not skip over non-PTR records
3764 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3766 [19881] string: Improve x86-64 memset
3767 [19907] string: Incorrect memcpy tests
3768 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3770 [19925] libc: termios.h XCASE namespace
3771 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3772 [19929] libc: limits.h NL_NMAX namespace
3773 [19931] stdio: Memory leak in vfprintf
3774 [19957] libc: clone(CLONE_VM) access invalid parent memory
3775 [19963] localedata: en_IL: New locale
3776 [19989] stdio: stdio.h cuserid namespace
3777 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3779 [19996] locale: langinfo.h nl_langinfo_l namespace
3780 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3781 [20010] network: getaddrinfo: Stack overflow in hostent translation
3783 [20012] stdio: libio: fmemopen append mode failure
3784 [20014] stdio: stdio.h namespace for pre-threads POSIX
3785 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3786 [20023] libc: fcntl.h timespec namespace
3787 [20024] math: [x86_64] vectorized sincos trashes the stack
3788 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3789 [20041] time: sys/time.h timespec namespace
3790 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3791 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3792 [20051] libc: ttyslot in wrong header under wrong conditions
3793 [20054] libc: gethostname not declared for XPG4
3794 [20055] libc: termios.h missing tcgetsid for XPG4
3795 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3797 [20073] libc: sys/stat.h fchmod namespace
3798 [20074] libc: stdlib.h rand_r namespace
3799 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3800 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3802 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3803 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3805 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3806 [20119] libc: Wrong mask for processors level type from CPUID
3807 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3808 AS not supporting AVX512
3809 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3811 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3812 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3814 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3815 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3816 [20178] libc: posix_spawn{p} should not call exit
3817 [20191] stdio: libio: vtables hardening
3818 [20195] string: FMA4 detection requires CPUID execution with register
3820 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3821 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3823 [20212] math: acos (sNaN) returns sNaN
3824 [20213] math: asin (sNaN) returns sNaN
3825 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3826 [20218] math: [i386] asinhl (sNaN) returns sNaN
3827 [20219] math: [i386] atanhl (sNaN) returns sNaN
3828 [20222] stdio: fopencookie: Mangle function pointers
3829 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3830 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3831 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3833 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3834 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3835 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3836 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3837 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3838 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3839 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3840 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3841 [20240] math: modf (sNaN) returns sNaN
3842 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3843 [20250] math: frexp (sNaN) returns sNaN
3844 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3845 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3847 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3848 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3849 subscript is below array bounds [-Werror=array-bounds]
3850 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3851 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3853 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3854 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3856 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3857 "invalid" exceptions
3858 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3859 [20316] localedata: id_ID: Februari instead of Pebruari
3860 [20327] string: POWER8 strcasecmp returns incorrect result
3861 [20347] math: Failure: Test: j0_downward (0xap+0)
3862 [20348] libc: FAIL: misc/tst-preadvwritev64
3863 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3864 [20350] libc: There is no test for p{read,write}64
3865 [20357] math: Incorrect cos result for 1.5174239687223976
3866 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3870 * Unicode 8.0.0 Support: Character encoding, character type info, and
3871 transliteration tables are all updated to Unicode 8.0.0, using new
3872 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3873 These updates cause user visible changes, such as the fixes for bugs
3874 89, 16061, and 18568.
3876 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3877 kernel-internal CPU set size. This means that requests that change the
3878 CPU affinity which failed before (for example, an all-ones CPU mask) will
3879 now succeed. Applications that need to determine the effective CPU
3880 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3881 setting it because the kernel can adjust it (and the previous size check
3882 would not detect this in the majority of cases).
3884 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3885 the following new symbols are used: fts64_children, fts64_close,
3886 fts64_open, fts64_read and fts64_set.
3888 * getaddrinfo now detects certain invalid responses on an internal netlink
3889 socket. If such responses are received, an affected process will
3890 terminate with an error message of "Unexpected error <number> on netlink
3891 descriptor <number>" or "Unexpected netlink response of size <number> on
3892 descriptor <number>". The most likely cause for these errors is a
3893 multi-threaded application which erroneously closes and reuses the netlink
3894 file descriptor while it is used by getaddrinfo.
3896 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3897 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3898 unnecessary serialization of memory allocation requests across threads.
3899 The defect is now corrected. Users should see a substantial increase in
3900 the concurent throughput of allocation requests for applications which
3901 trigger this bug. Affected applications typically create and
3902 destroy threads frequently. (Bug 19048 was reported and analyzed by
3905 * There is now a --disable-timezone-tools configure option for disabling the
3906 building and installing of the timezone related utilities (zic, zdump, and
3907 tzselect). This is useful for people who build the timezone data and code
3908 independent of the GNU C Library.
3910 * The obsolete header <regexp.h> has been removed. Programs that require
3911 this header must be updated to use <regex.h> instead.
3913 * The obsolete functions bdflush, create_module, get_kernel_syms,
3914 query_module and uselib are no longer available to newly linked binaries;
3915 the header <sys/kdaemon.h> has been removed. These functions and header
3916 were specific to systems using the Linux kernel and could not usefully be
3917 used with the GNU C Library on systems with version 2.6 or later of the
3920 * Optimized string, wcsmbs and memory functions for IBM z13.
3921 Implemented by Stefan Liebler.
3923 * Newly linked programs that define a variable called signgam will no longer
3924 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3925 require signgam to be set by those functions must ensure that they use the
3926 variable provided by the GNU C Library and declared in <math.h>, without
3927 defining their own copy.
3929 * The minimum GCC version that can be used to build this version of the GNU
3930 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3931 still be used to compile programs using the GNU C Library.
3933 Security related changes:
3935 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3936 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3938 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3939 the pointer guard feature. It is always enabled. Previously,
3940 LD_POINTER_GUARD could be used to disable security hardening in binaries
3941 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3944 * An integer overflow in hcreate and hcreate_r could lead to an
3945 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3947 * The catopen function no longer has unbounded stack usage. Reported by
3948 Max. (CVE-2015-8779)
3950 * The nan, nanf and nanl functions no longer have unbounded stack usage
3951 depending on the length of the string passed as an argument to the
3952 functions. Reported by Joseph Myers. (CVE-2014-9761)
3954 * A stack-based buffer overflow was found in libresolv when invoked from
3955 libnss_dns, allowing specially crafted DNS responses to seize control
3956 of execution flow in the DNS client. The buffer overflow occurs in
3957 the functions send_dg (send datagram) and send_vc (send TCP) for the
3958 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3959 family. The use of AF_UNSPEC triggers the low-level resolver code to
3960 send out two parallel queries for A and AAAA. A mismanagement of the
3961 buffers used for those queries could result in the response of a query
3962 writing beyond the alloca allocated buffer created by
3963 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3964 the overflow. Thanks to the Google Security Team and Red Hat for
3965 reporting the security impact of this issue, and Robert Holiday of
3966 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3968 The following bugs are resolved with this release:
3970 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3971 [887] math: Math library function "logb" and "nextafter" inconsistent
3972 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3973 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3974 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3975 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3977 [4404] localedata: German translation of "Alarm clock" is misleading
3978 [6799] math: nextafter() and nexttoward() doen't set errno on
3979 overflow/underflow errors
3980 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3982 [10432] nis: _nss_nis_setnetgrent assertion failure
3983 [11460] libc: fts has no LFS support
3984 [12926] network: getaddrinfo()/make_request() may spin forever
3985 [13065] nptl: Race condition in pthread barriers
3986 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3987 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3989 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3990 [14912] libc: Rename non-installed bits/*.h headers
3991 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3992 [15367] math: Let gcc use __builtin_isinf
3993 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3994 [15421] math: lgamma wrongly sets signgam for ISO C
3995 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3996 FE_INVALID with argument out of range
3997 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3999 [15786] dynamic-link: ifunc resolver functions can smash function
4001 [15918] math: Unnecessary check for equality in hypotf()
4002 [16061] localedata: Review / update transliteration data
4003 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4005 [16141] time: strptime %z offset restriction
4006 [16171] math: drem should be alias of remainder
4007 [16296] math: fegetround is pure?
4008 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4009 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4011 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4012 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4014 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4015 "Exception "Inexact" set" on ppc32
4016 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4017 [16517] math: Missing underflow exception from tanf/tan/tanl
4018 [16519] math: Missing underflow exception from sinhf
4019 [16520] math: Missing underflow exception from tanhf
4020 [16521] math: Missing underflow exception from exp2
4021 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4023 [16734] stdio: fopen calls mmap to allocate its buffer
4024 [16961] math: nan function incorrect handling of bad sequences
4025 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4026 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4027 [16985] locale: localedef: confusing error message when opening output
4029 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4030 [17197] locale: Redundant shift character in iconv conversion output at
4032 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4033 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4034 [17250] dynamic-link: static linking breaks nss loading
4035 (getaddrinfo/getpwnam/etc...)
4036 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4038 [17441] math: isnan() should use __builtin_isnan() in GCC
4039 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4040 (related to lock elision)
4041 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4042 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4043 [17887] time: strptime should be able to parse "+01:00" style timezones
4044 [17905] libc: catopen() Multiple unbounded stack allocations
4046 [18084] libc: backtrace (..., 0) dumps core on x86
4047 [18086] libc: nice() sets errno to 0 on success
4048 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4049 is too large (CVE-2015-8778)
4050 [18251] dynamic-link: SONAME missing when audit modules provides path
4051 [18265] libc: add attributes for wchar string and memory functions
4052 [18370] math: csqrt missing underflows
4053 [18421] libc: [hppa] read-only segment has dynamic relocations
4054 [18472] libc: Obsolete syscall wrappers should be compat symbols
4055 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4056 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4057 [18525] localedata: Remove locale timezone information
4058 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4059 [18568] localedata: Update locale data to Unicode 8.0
4060 [18589] locale: sort-test.sh fails at random
4061 [18595] math: ctan, ctanh missing underflows
4062 [18604] libc: assert macro-expands its argument
4063 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4064 contains a vector instruction exception.
4065 [18611] math: j1, jn missing errno setting on underflow
4066 [18618] localedata: sync Chechen locale definitions with other *_RU
4068 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4069 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4070 [18665] network: In send_dg, the recvfrom function is NOT always using the
4071 buffer size of a newly created buffer (CVE-2015-7547)
4072 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4074 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4076 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4077 [18699] math: tilegx cproj() for various complex infinities does not yield
4079 [18724] libc: Harden put*ent functions against data injection
4080 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4081 [18755] build: build errors with -DNDEBUG
4082 [18757] stdio: fmemopen fails to set errno on failure
4083 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4085 [18781] libc: openat64 lacks O_LARGEFILE
4086 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4087 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4088 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4089 [18790] math: [ldbl-128ibm] tanhl inaccurate
4090 [18795] libc: stpncpy fortification misses buffer lengths that are
4091 statically too large
4092 [18796] build: build fails for --disable-mathvec
4093 [18803] math: hypot missing underflows
4094 [18820] stdio: fmemopen may leak memory on failure
4095 [18823] math: csqrt spurious underflows
4096 [18824] math: fma spurious underflows
4097 [18825] math: pow missing underflows
4098 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4099 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4100 [18870] build: sem_open.c fails to compile with missing symbol
4102 [18872] stdio: Fix memory leak in printf_positional
4103 [18873] libc: posix_fallocate overflow check ineffective
4104 [18875] math: Excess precision leads incorrect libm
4105 [18877] libc: arm: mmap offset regression
4106 [18887] libc: memory corruption when using getmntent on blank lines
4107 [18918] localedata: hu_HU: change time to HH:MM:SS format
4108 [18921] libc: Regression: extraneous stat() and fstat() performed by
4110 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4111 binaries (CVE-2015-8777)
4112 [18951] math: tgamma missing underflows
4113 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4115 [18953] localedata: lt_LT: change currency symbol to the euro
4116 [18956] math: powf inaccuracy
4117 [18961] math: [i386] exp missing underflows
4118 [18966] math: [i386] exp10 missing underflows
4119 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4120 [18969] build: multiple string test failures due to missing locale
4122 [18970] libc: Reference of pthread_setcancelstate in libc.a
4123 [18977] math: float / long double Bessel functions not in XSI POSIX
4124 [18980] math: i386 libm functions return with excess range and precision
4125 [18981] math: i386 scalb*, ldexp return with excess range and precision
4126 [18982] stdio: va_list and vprintf
4127 [18985] time: Passing out of range data to strftime() causes a segfault
4129 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4130 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4131 [19012] locale: iconv_open leaks memory on error path
4132 [19016] math: clog, clog10 inaccuracy
4133 [19018] nptl: Mangle function pointers in tls_dtor_list
4134 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4135 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4136 [19048] malloc: malloc: arena free list can become cyclic, increasing
4138 [19049] math: [powerpc] erfc incorrect zero sign
4139 [19050] math: [powerpc] log* incorrect zero sign
4140 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4141 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4142 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4143 [19074] network: Data race in _res_hconf_reorder_addrs
4144 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4145 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4146 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4148 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4150 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4151 [19086] manual: posix_fallocate64 documented argument order is wrong.
4152 [19088] math: lround, llround missing exceptions close to overflow
4154 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4155 [19095] math: dbl-64 lrint incorrect for 64-bit long
4156 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4157 [19124] dynamic-link: ld.so failed to build with older assmebler
4158 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4159 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4160 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4161 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4162 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4163 pthread_setaffinity_np
4164 [19156] math: [ldbl-128] j0l spurious underflows
4165 [19164] nptl: tst-getcpu fails with many possible CPUs
4166 [19168] math: math/test-ildoubl and math/test-ldouble failure
4167 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4168 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4170 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4171 (FE_NOMASK_ENV) do not clear SSE exceptions
4172 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4173 _int_new_arena/reused_arena
4174 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4175 [19201] math: dbl-64 remainder incorrect sign of zero result
4176 [19205] math: bits/math-finite.h conditions do not match math.h and
4178 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4179 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4180 for C99-based standards
4181 [19212] libc: features.h not -Wundef clean
4182 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4184 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4185 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4186 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4188 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4189 "inexact" exceptions
4190 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4192 [19242] libc: strtol incorrect in Turkish locales
4193 [19243] malloc: reused_arena can pick an arena on the free list, leading
4194 to an assertion failure and reference count corruption
4195 [19253] time: tzset() ineffective when temporary TZ did not include DST
4197 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4198 [19270] math: [hppa] Shared libm missing __isnanl
4199 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4200 MAP_HUGETLB and MAP_STACK defines
4201 [19313] nptl: Wrong __cpu_mask for x32
4202 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4203 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4204 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4205 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4206 [19363] time: x32: times() return value wrongly truncates/sign extends
4208 [19367] dynamic-link: Improve branch prediction on Silvermont
4209 [19369] network: Default domain name not reset by res_ninit when "search"
4210 / "domain" entry is removed from resolv.conf
4211 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4213 [19385] localedata: bg_BG: time separator should be colon, not comma
4214 [19408] libc: linux personality syscall wrapper may erroneously return an
4215 error on 32-bit architectures
4216 [19415] libc: dladdr returns wrong names on hppa
4217 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4218 IBM905, IBM907, and IBM909
4219 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4220 [19443] build: build failures with -DDEBUG
4221 [19451] build: Make check fails on test-double-vlen2
4222 [19462] libc: Glibc failed to build with -Os
4223 [19465] math: Wrong code with -Os
4224 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4226 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4228 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4229 [19486] math: S390: Math tests fail with "Exception Inexact set".
4230 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4231 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4233 [19590] math: Fail to build shared objects that use libmvec.so functions.
4237 * The following bugs are resolved with this release:
4239 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4240 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4241 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4242 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4243 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4244 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4245 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4246 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4247 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4248 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4249 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4250 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4251 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4252 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4253 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4254 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4255 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4256 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4257 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4258 18657, 18676, 18694, 18696, 18887.
4260 * Cache information can be queried via sysconf() function on s390 e.g. with
4261 _SC_LEVEL1_ICACHE_SIZE as argument.
4263 * A buffer overflow in gethostbyname_r and related functions performing DNS
4264 requests has been fixed. If the NSS functions were called with a
4265 misaligned buffer, the buffer length change due to pointer alignment was
4266 not taken into account. This could result in application crashes or,
4267 potentially arbitrary code execution, using crafted, but syntactically
4268 valid DNS responses. (CVE-2015-1781)
4270 * The time zone file parser has been made more robust against crafted time
4271 zone files, avoiding heap buffer overflows related to the processing of
4272 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4273 large time zone data files. Overly long time zone specifiers in the TZ
4274 variable no longer result in stack overflows and crashes.
4276 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4277 for LD and GD on x86 and x86-64, has been implemented. You will need
4278 binutils-2.24 or later to enable this optimization.
4280 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4281 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4282 Hat). These updates cause user visible changes, such as the fix for bug
4285 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4286 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4287 condition in some applications.
4289 * Added vector math library named libmvec with the following vectorized x86_64
4290 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4292 The library can be disabled with --disable-mathvec. Use of the functions is
4293 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4294 Shared library libmvec.so is linked in as needed when using -lm (no need to
4295 specify -lmvec explicitly for not static builds).
4296 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4298 * A new fmemopen implementation has been added with the goal of POSIX
4299 compliance. The new implementation fixes the following long-standing
4300 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4301 old implementation is still present for use be by existing binaries.
4303 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4304 releases. It has been fixed to match 2.19 and older, but binaries built
4305 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4307 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4308 Contributed by Roland McGrath (Google).
4310 * The header <regexp.h> is deprecated, and will be removed in a future
4311 release. Use of this header will trigger a deprecation warning.
4312 Application developers should update their code to use <regex.h> instead.
4314 This header was formerly part of SUS, but was deprecated in 1994 and
4315 removed from the standard in 2001. Also, the glibc implementation
4316 leaks memory. See BZ#18681 for more details.
4320 * The following bugs are resolved with this release:
4322 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4323 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4324 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4325 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4326 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4327 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4328 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4329 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4330 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4331 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4334 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4335 too little memory for the to-be-scanned arguments and overflow the
4336 allocated buffer. The implementation now correctly computes the required
4337 buffer size when using malloc, and switches to malloc from alloca as
4340 * A new semaphore algorithm has been implemented in generic C code for all
4341 machines. Previous custom assembly implementations of semaphore were
4342 difficult to reason about or ensure that they were safe. The new version
4343 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4344 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4345 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4347 * Port to Altera Nios II has been contributed by Mentor Graphics.
4349 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4350 implementations for powerpc64/powerpc64le.
4351 Implemented by Adhemerval Zanella (IBM).
4353 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4354 and powerpc64le. This may improve lock scaling of existing programs on
4355 HTM capable systems. The lock elision code is only enabled with
4356 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4357 powerpc will issue a transaction abort on every syscall to avoid side
4358 effects being visible outside transactions.
4360 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4361 AArch64. Contributed by ARM Ltd.
4363 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4365 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4366 under certain input conditions resulting in the execution of a shell for
4367 command substitution when the application did not request it. The
4368 implementation now checks WRDE_NOCMD immediately before executing the
4369 shell and returns the error WRDE_CMDSUB as expected.
4371 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4372 processing format strings with a large number of format specifiers.
4374 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4375 infinite loop if the DNS response contained a PTR record of an unexpected
4378 * The minimum GCC version that can be used to build this version of the GNU
4379 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4380 still be used to compile programs using the GNU C Library.
4382 * The GNU C Library is now built with -Werror by default. This can be
4383 disabled by configuring with --disable-werror.
4385 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4387 * The obsolete sigvec function has been removed. This was the original
4388 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4389 programs have been using instead for about 25 years. Of course, ABI
4390 compatibility for old binaries using sigvec remains intact.
4392 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4393 with newer versions of bison.
4395 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4396 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4397 registers overlay two consecutive single-precision registers. MIPS32R2
4398 introduced a new FPU mode (FR=1) where double-precision registers extend the
4399 corresponding single-precision registers which is incompatible with the
4400 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4401 require the use of FR=1 making a transition necessary. New o32 ABI
4402 extensions enable users to migrate over time from the original o32 ABI
4403 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4404 tracks the ABI of any loaded object and verifies that new objects are
4405 compatible. Mode transitions will also be requested as required and
4406 unsupportable objects will be rejected. The ABI checks include both soft and
4407 hard float ABIs for o32, n32 and n64.
4409 GCC 5 with GNU binutils 2.25 onwards:
4410 It is strongly recommended that all o32 system libraries are built using the
4411 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4412 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4413 compiler using --with-fp-32=xx to set this by default.
4417 * The following bugs are resolved with this release:
4419 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4420 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4421 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4422 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4423 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4424 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4425 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4426 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4427 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4428 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4429 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4430 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4431 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4432 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4433 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4435 * Reverted change of ABI data structures for s390 and s390x:
4436 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4437 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4438 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4439 are preserved pointing straight to the same implementation as the old ones.
4440 Given that, new callers will simply provide a too-big buffer to these
4441 functions. Any applications/libraries out there that embed jmp_buf or
4442 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4443 against 2.19 headers will have to rebuilt again. This is necessary in any
4444 case to revert the breakage in their ABI caused by the glibc change.
4446 * Support for file description locks is added to systems running the
4447 Linux kernel. The standard file locking interfaces are extended to
4448 operate on file descriptions, not file descriptors, via the use of
4449 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4450 are associated with an open file instead of a process.
4452 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4454 * The minimum Linux kernel version that this version of the GNU C Library
4455 can be used with is 2.6.32.
4457 * Running the testsuite no longer terminates as soon as a test fails.
4458 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4459 with PASS or FAIL lines for individual tests. A summary of the results is
4460 printed, including a list of failing lists, and "make check" exits with
4461 error status if there were any unexpected failures. "make check
4462 stop-on-test-failure=y" may be used to keep the old behavior.
4464 * The am33 port, which had not worked for several years, has been removed
4467 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4468 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4469 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4470 conflicted with POSIX (support for which was removed in 2.19), the
4471 interfaces those macros enabled remain available when compiling with
4472 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4473 test macros defined.
4475 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4477 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4478 This may improve lock scaling of existing programs on TX capable systems.
4479 The lock elision code is only built with --enable-lock-elision=yes and
4480 then requires a GCC version supporting the TX builtins. With lock elision
4481 default mutexes are elided via __builtin_tbegin, if the cpu supports
4482 transactions. By default lock elision is not enabled and the elision code
4485 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4486 copy the path argument. This allowed programs to cause posix_spawn to
4487 deference a dangling pointer, or use an unexpected pathname argument if
4488 the string was modified after the posix_spawn_file_actions_addopen
4491 * All supported architectures now use the main glibc sysdeps directory
4492 instead of some being in a separate "ports" directory (which was
4493 distributed separately before glibc 2.17).
4495 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4496 On configurations that support it (all Linux configurations), it's now
4497 used regardless of the --enable-add-ons switch to configure. It is no
4498 longer possible to build such configurations without pthreads support.
4500 * Locale names, including those obtained from environment variables (LANG
4501 and the LC_* variables), are more tightly checked for proper syntax.
4502 setlocale will now fail (with EINVAL) for locale names that are overly
4503 long, contain slashes without starting with a slash, or contain ".." path
4504 components. (CVE-2014-0475) Previously, some valid locale names were
4505 silently replaced with the "C" locale when running in AT_SECURE mode
4506 (e.g., in a SUID program). This is no longer necessary because of the
4509 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4510 with application code using Intel MPX instructions. (With all previous
4511 versions, the MPX register state could be clobbered when making calls
4512 into or out of a shared library.) Note that while the new dynamic
4513 linker is compatible with all known x86 hardware whether or not it
4514 supports Intel MPX, some x86 instruction-set emulators might fail to
4515 handle the new instruction encodings. This is known to affect Valgrind
4516 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4517 release), and might affect other tools that do instruction emulation.
4519 * Support for loadable gconv transliteration modules has been removed.
4520 The support for transliteration modules has been non-functional for
4521 over a decade, and the removal is prompted by security defects. The
4522 normal gconv conversion modules are still supported. Transliteration
4523 with //TRANSLIT is still possible, and the //IGNORE specifier
4524 continues to be supported. (CVE-2014-5119)
4526 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4527 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4528 resulting a denial-of-service security vulnerability in applications which
4529 use functions related to iconv. (CVE-2014-6040)
4533 * The following bugs are resolved with this release:
4535 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4536 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4537 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4538 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4539 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4540 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4541 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4542 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4543 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4544 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4545 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4546 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4547 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4548 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4549 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4550 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4551 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4552 16431, 16453, 16474, 16506, 16510, 16529
4554 * Slovenian translations for glibc messages have been contributed by the
4555 Translation Project's Slovenian team of translators.
4557 * The public headers no longer use __unused nor __block. This change is to
4558 support compiling programs that are derived from BSD sources and use
4559 __unused internally, and to support compiling with Clang's -fblock
4560 extension which uses __block.
4562 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4563 large collation sequences to optimize multiple passes. This cache
4564 computation may overflow for large collation sequences and may cause a
4565 stack or buffer overflow. This is now fixed to use a slower algorithm
4566 which does not use a cache if there is an integer overflow.
4568 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4569 rules for large collation sequences to optimize multiple passes and falls
4570 back to alloca if malloc fails, resulting in a possible stack overflow.
4571 The implementation now falls back to an uncached collation sequence lookup
4574 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4575 initialized for static applications resulting in the security feature
4576 being disabled. The pointer guard is now correctly initialized to a
4577 random value for static applications. Existing static applications need
4578 to be recompiled to take advantage of the fix (bug 15754).
4580 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4581 to the d_name member of struct dirent, or omit the terminating NUL
4582 character. (Bugzilla #14699).
4584 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4585 aligned_alloc functions could allocate too few bytes or corrupt the
4586 heap when passed very large allocation size values (Bugzilla #15855,
4589 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4590 for AF_INET6 has been fixed (Bugzilla #16072).
4592 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4593 pap_CW, quz_PE, the_NP.
4595 * Substantially revised locales: gd_GB, ht_HT
4597 * The LC_ADDRESS field was updated to support country_car for almost all
4600 * ISO 1427 definitions were updated.
4602 * ISO 3166 definitions were updated.
4604 * The localedef utility now supports --big-endian and --little-endian
4605 command-line options to generate locales for a different system from that
4606 for which the C library was built.
4608 * Binary locale files now only depend on the endianness of the system for
4609 which they are generated and not on other properties of that system. As a
4610 consequence, binary files generated with new localedef may be incompatible
4611 with old versions of the GNU C Library, and binary files generated with
4612 old localedef may be incompatible with this version of the GNU C Library,
4613 in the following circumstances:
4615 + Locale files may be incompatible on m68k systems.
4617 + Locale archive files (but not separate files for individual locales) may
4618 be incompatible on systems where plain "char" is signed.
4620 * The configure option --disable-versioning has been removed. Builds with
4621 --disable-versioning had not worked for several years.
4623 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4624 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4626 * SystemTap probes for malloc have been introduced.
4628 * SystemTap probes for slow multiple precision fallback paths of
4629 transcendental functions have been introduced.
4631 * Support for powerpc64le has been added.
4633 * The soft-float powerpc port now supports e500 processors.
4635 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4637 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4638 set of header declarations that are enabled by default, even when other
4639 feature test macros or compiler options such as -std=c99 would otherwise
4640 disable some of those declarations.
4642 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4643 conflict with POSIX. The libbsd-compat library (which was a dummy library
4644 that did nothing) has also been removed.
4646 * Preliminary documentation about Multi-Thread, Async-Signal and
4647 Async-Cancel Safety has been added.
4649 * Change of ABI data structures for s390 and s390x:
4650 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4651 allow for future hardware extensions. All library functions that accept or
4652 return these structures were versioned in order to provide backwards
4653 compatibility with existing code. However, not all cases can be handled
4654 with interface versioning. If an application embeds either structure into
4655 another structure and that structure is passed to another compilation unit
4656 which expects the newer larger-sized object then any access to the new
4657 fields will result in undefined behaviour. Similarly any access to fields
4658 that were moved by the enlarging of the structures will cause undefined
4659 behaviour. To fix the undefined behaviour all objects that are part of the
4660 final in-memory image must agree on the size of structures, and this may
4661 require recompilation.
4665 * The following bugs are resolved with this release:
4667 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4668 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4669 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4670 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4671 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4672 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4673 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4674 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4675 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4676 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4677 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4678 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4679 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4682 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4683 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4684 Distributions can re-enable building and using pt_chown via the new configure
4685 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4686 considerable security risks and should only be used if the distribution
4687 understands and accepts the risks.
4689 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4692 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4693 fixed (Bugzilla #15330).
4695 * Add support for calling C++11 thread_local object destructors on thread
4696 and program exit. This needs compiler support for offloading C++11
4697 destructor calls to glibc.
4699 * Improved worst case performance of libm functions with double inputs and
4702 * Support for priority inherited mutexes in pthread condition variables on
4703 non-x86 architectures.
4705 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4707 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4709 * Optimized string functions for ARM. Implemented by Will Newton and
4712 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4714 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4717 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4718 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4720 * Added a benchmark framework to track performance of functions in glibc.
4722 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4723 It is based on draft TS 18661 and currently enabled as a GNU extension.
4725 * On Linux, the clock function now uses the clock_gettime system call
4726 for improved precision, rather than old times system call.
4728 * Added support for version-3 tz format files. This is needed when using
4729 the tz database release 2013e or later, and affects a few unusual cases --
4730 currently only TZ='America/Godthab' for time stamps after 2037.
4732 * Added new API functions pthread_getattr_default_np and
4733 pthread_setattr_default_np to get and set the default pthread
4734 attributes of a process.
4736 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4737 This may improve lock scaling of existing programs on TSX capable systems.
4738 When the --enable-lock-elision=yes parameter is specified at configure
4739 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4742 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4743 availability). Implemented by Ryan S. Arnold.
4745 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4749 * The following bugs are resolved with this release:
4751 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4752 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4753 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4754 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4755 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4756 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4757 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4758 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4759 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4760 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4761 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4762 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4763 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4764 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4765 14879, 14889, 14893, 14898, 14914.
4767 * Optimization of memcpy for MIPS.
4769 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4770 EMFILE has been fixed (Bugzilla #14889).
4772 * The add-on ports collection is now distributed in the "ports" subdirectory
4773 of the main GNU C Library distribution, rather than separately.
4775 * Port to ARM AArch64 contributed by Linaro.
4777 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4778 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4780 Implemented by Andreas Krebbel.
4782 * The new function secure_getenv allows secure access to the environment,
4783 returning NULL if running in a SUID/SGID process. This function replaces
4784 the internal function __secure_getenv.
4786 * SystemTap static probes have been added into the dynamic linker.
4787 Implemented by Gary Benson.
4789 * Optimizations of string functions strstr, strcasestr and memmem.
4790 Implemented by Maxim Kuvyrkov.
4792 * The minimum Linux kernel version that this version of the GNU C Library
4793 can be used with is 2.6.16.
4795 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4796 powerpc POWER7. Implemented by Will Schmidt.
4798 * New configure option --disable-nscd builds the C library such that it
4799 never attempts to contact the Name Service Caching Daemon (nscd).
4800 New configure option --disable-build-nscd avoids building nscd itself;
4801 this is the default if --disable-nscd is used.
4803 * Improved support for cross-compilation, including cross-testing and
4804 bootstrap builds without a previously built glibc.
4806 * Several testsuite tests are now able to test multiple IFUNC variants of an
4807 interface, rather than just testing the one that would be chooen by
4810 * New configure options --with-bugurl and --with-pkgversion, for
4811 distributors to use to embed their bug-reporting and package version
4812 information in --help and --version output.
4814 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4815 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4816 allows creation of chroots without the procfs mounted on /proc.
4818 * The `crypt' function now fails if passed salt bytes that violate the
4819 specification for those values. On Linux, the `crypt' function will
4820 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4821 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4822 when the mode is enabled.
4824 * The `clock_*' suite of functions (declared in <time.h>) is now available
4825 directly in the main C library. Previously it was necessary to link with
4826 -lrt to use these functions. This change has the effect that a
4827 single-threaded program that uses a function such as `clock_gettime' (and
4828 is not linked with -lrt) will no longer implicitly load the pthreads
4829 library at runtime and so will not suffer the overheads associated with
4830 multi-thread support in other code such as the C++ runtime library.
4832 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4837 * The following bugs are resolved with this release:
4839 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4840 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4841 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4842 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4843 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4844 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4845 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4846 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4847 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4848 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4849 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4850 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4851 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4852 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4853 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4854 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4855 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4856 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4857 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4858 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4859 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4860 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4863 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4864 configuring glibc with:
4865 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4866 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4867 Implemented by H.J. Lu.
4871 + define static_assert
4873 + do not declare gets
4875 + declare at_quick_exit and quick_exit also for ISO C11
4877 + aligned_alloc. NB: The code is deliberately allows the size parameter
4878 to not be a multiple of the alignment. This is a moronic requirement
4879 in the standard but it is only a requirement on the caller, not the
4882 + timespec_get added
4884 + uchar.h support added
4886 + CMPLX, CMPLXF, CMPLXL added
4888 Implemented by Ulrich Drepper.
4890 * Support for the IA-64 has been moved to ports.
4892 * Remove support for anything but ELF binary format
4894 * Checking versions of poll, ppoll added.
4895 Implemented by Ulrich Drepper.
4897 * More generic and 64-bit performance optimizations to math functions.
4898 Implemented by Ulrich Drepper.
4900 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4901 headers and functions available at compile time as they were before
4902 version 2.14. This option will be removed at some time in the future
4903 after the TI-RPC library becomes fully sufficient for the needs of
4904 existing applications.
4906 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4907 Note that glibc is not expected to work with any Linux kernel version
4910 * New header <sys/auxv.h> and function getauxval allowing easy access to
4911 the AT_* key-value pairs passed from the Linux kernel. The header also
4912 defines the HWCAP_* bits associated with the AT_HWCAP key.
4914 * New locales: mag_IN
4916 * New configure option --enable-systemtap builds SystemTap static probes
4917 into libc for setjmp and longjmp and into libpthread for various operations.
4918 So far the setjmp/longjmp probes and some of the libpthread probes are
4919 provided only for i*86 and x86_64.
4920 Implemented by Roland McGrath and Rayson Ho.
4922 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4924 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4927 * More optimized functions for SPARC. Implemented by David S. Miller.
4929 * Improved support for cross-compilation, especially bootstrap builds
4930 without a previously built glibc.
4932 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4933 Chris Metcalf from Tilera.
4935 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4936 now supported for ARM processors.
4938 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4939 as the name of the dynamic linker, to distinguish it from the
4940 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4942 * Support for CRIS has been removed from ports.
4944 * A new class of installed header has been documented for low-level
4945 platform-specific functionality. PowerPC added the first instance with a
4946 function to provide time base register access. Contributed by Tulio
4947 Magno Quites Machado Filho.
4949 * ix86 configurations now install header files that are consistent with
4950 what x86-64 configurations install. These same header files can be used
4951 for -m32, -m64, or -mx32 builds.
4952 Contributed by H.J. Lu.
4954 * Math library bug fixes. A thorough audit of all open math library bugs was
4955 conducted by Joseph Myers. Significant progress was made on many math
4956 library bugs resulting in more accurate exceptions and function results.
4957 Many thanks to all those that contributed including Andreas Jaeger for his
4958 patch review and work on the x87 trigonometric instruction issues.
4960 * Timezone data is no longer installed. Timezone-related binaries and scripts
4961 will continue to be installed. Users should obtain their timezone data from
4962 their distribution provider or from the tzdata package at
4963 <ftp://munnari.oz.au/pub/>.
4967 * The following bugs are resolved with this release:
4969 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4970 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4971 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4972 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4973 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4974 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4975 13484, 13506, 13515, 13523, 13524, 13538, 13540
4977 * New program pldd to list loaded object of a process
4978 Implemented by Ulrich Drepper.
4980 * Add nss_db support back to glibc. No more dependency on Berkeley db
4981 and support for initgroups lookups.
4982 Implemented by Ulrich Drepper.
4984 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4985 Contributed by HJ Lu.
4987 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4988 Contributed by HJ Lu.
4990 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4991 on x86-32 and x86-64.
4992 Contributed by Liubov Dmitrieva.
4994 * Optimized strchr and strrchr for SSE on x86-32.
4995 Contributed by Liubov Dmitrieva.
4997 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4998 for x86-64 and x86-32.
4999 Contributed by Liubov Dmitrieva.
5001 * New interfaces: scandirat, scandirat64
5002 Implemented by Ulrich Drepper.
5004 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5005 Implemented by Ulrich Drepper.
5007 * nscd now also caches the netgroup database.
5008 Implemented by Ulrich Drepper.
5010 * Integrate libm with gcc's -ffinite-math-only option.
5011 Implemented by Ulrich Drepper.
5013 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5014 to math functions. Implemented by Ulrich Drepper.
5016 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5017 Implemented by Ulrich Drepper.
5019 * New Linux interfaces: process_vm_readv, process_vm_writev
5021 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5022 Implemented by Ulrich Drepper.
5024 * Optimized nearbyint and strcasecmp for PPC.
5025 Implemented by Adhemerval Zanella.
5027 * New locales: bho_IN, unm_US, es_CU, ta_LK
5031 * The following bugs are resolved with this release:
5033 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5034 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5035 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5036 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5037 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5038 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5039 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5040 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5041 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5042 12795, 12811, 12813, 12814, 12841
5044 * The RPC implementation in libc is obsoleted. Old programs keep working
5045 but new programs cannot be linked with the routines in libc anymore.
5046 Programs in need of RPC functionality must be linked against TI-RPC.
5047 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5049 Visible changes of this change include (obviously) the inability to link
5050 programs using RPC functions without referencing the TI-RPC library and the
5051 removal of the RPC headers from the glibc headers.
5052 Implemented by Ulrich Drepper.
5054 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5055 syncfs, setns, sendmmsg
5057 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5058 yue_HK, lij_IT, mhr_RU
5060 * New encodings: CP770, CP771, CP772, CP773, CP774
5062 * New program sotruss to trace calls through PLTs
5063 Implemented by Ulrich Drepper.
5065 * The malloc hook implementation is marked deprecated and will be removed
5066 from the default implementation in the next version. The design never
5067 worked ever since the introduction of threads. Even programs which do
5068 not create threads themselves can use multiple threads created internally.
5072 * The following bugs are resolved with this release:
5074 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5075 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5076 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5077 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5080 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5082 * POWER7 optimizations: memset, memcmp, strncmp
5084 * New optimized string functions for x86-64: strnlen (SSE2),
5085 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5086 Implemented by Ulrich Drepper.
5090 * The following bugs are resolved with this release:
5092 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5093 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5094 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5095 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5096 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5097 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5098 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5099 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5101 * New interfaces: pthread_getname_np, pthread_setname_np
5103 * New Linux interface: recvmmsg
5105 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5107 * The dynamic linker now recognizes supported ABI versions from the
5108 EI_ABIVERSION field in the ELF header.
5109 Implemented by Ulrich Drepper.
5111 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5112 will not be used to fill in password fields in the passwd.byname replies.
5113 Instead it is used to synthesize the shadow.byname table, should it be
5114 missing. This is a useful mode in some installations involving Solaris.
5115 Implemented by Ulrich Drepper.
5117 * New locales: kok_IN, sq_MK, cv_RU
5121 * The following bugs are resolved with this release:
5123 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5124 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5125 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5126 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5127 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5128 10789, 10817, 10823, 10840, 10847
5130 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5132 Implemented by Ulrich Drepper.
5134 * Checking version of longjmp added that fails if an uninitialized stack
5135 frame would be created. Implemented by Ulrich Drepper.
5137 * STT_GNU_IFUNC is now supported in static executables.
5138 Implemented by H.J. Lu.
5140 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5142 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5143 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5144 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5145 Contributed by H.J. Lu.
5147 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5148 Implemented by Ulrich Drepper.
5150 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5152 Contributed by H.J. Lu.
5154 * Support for fma instruction in AVX on x86-64.
5155 Implemented by H.J. Lu and Ulrich Drepper.
5157 * AVX support in x86-64 auditing support in ld.so.
5158 Implemented by H.J. Lu.
5160 * STB_GNU_UNIQUE support added.
5161 Implemented by Ulrich Drepper.
5163 * Implement second fallback mode for optimized DNS lookup for even more
5164 broken environments. If two requests from the same port are not
5165 handled correctly close the socket and open a new one before sending
5166 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5167 can be used to select this mode right away, instead of rediscovering the
5168 necessity is every process again.
5169 Implemented by Ulrich Drepper.
5171 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5172 Implemented by Adam Tkac.
5174 * Optimized iconv conversions for S390x.
5175 Implemented by Andreas Krebbel.
5177 * Using condvars with PI mutexes is now more efficient due to kernel
5178 support for requeueing to PI futexes. NPTL support added for x86-64.
5179 Implemented by Ulrich Drepper.
5181 * New locales: ps_AF, my_MM
5185 * The following bugs are resolved with this release:
5187 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5188 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5189 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5190 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5191 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5193 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5194 Implemented by Ulrich Drepper.
5196 * New Linux interfaces: accept4, fallocate, fallocate64.
5197 Implemented by Ulrich Drepper.
5199 * Correct declarations of string function when used in C++ code. This
5200 could lead to compile errors for invalid C++ code.
5202 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5205 * New POSIX 2008 interface: psiginfo
5206 Implemented by Ulrich Drepper.
5208 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5209 Implemented by Ulrich Drepper.
5211 * Support for selecting between multiple function definitions at runtime
5212 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5214 * The libcrypt library can now use the hash function implementations in
5215 NSS. Implemented by Ulrich Drepper.
5217 * The malloc implementation can be compiled to be less memory efficient
5218 but higher performing in multi-threaded programs.
5219 Implemented by Ulrich Drepper.
5221 * New locales: nan_TW@latin, ks_IN
5223 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5224 Implemented by Ulrich Drepper.
5226 * Extended printf hook support. It is possible to use user-defined types
5227 and extend existing format specifiers.
5228 Implemented by Ulrich Drepper.
5230 * Handling for group shadow files has been added.
5231 Implemented by Ulrich Drepper.
5233 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5234 servers (the case, e.g., for some people using the built-in DNS
5235 server in ADSL modems/routers). There is a once-per-process timeout
5236 in case of a broken server. To avoid it, users can run nscd or put
5237 'options single-request' in /etc/resolv.conf.
5238 Implemented by Ulrich Drepper.
5242 * The following bugs are resolved with this release:
5244 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5245 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5246 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5247 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5248 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5250 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5251 up at the same time. Implemented by Ulrich Drepper.
5253 * TLS descriptors for LD and GD on x86 and x86-64.
5254 Implemented by Alexandre Oliva.
5256 * getaddrinfo now handles DCCP and UDPlite.
5257 Implemented by Ulrich Drepper.
5259 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5260 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5261 Implemented by Ulrich Drepper.
5263 * New implementation of memmem, strstr, and strcasestr which is O(n).
5264 Implemented by Eric Blake.
5266 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5268 * Implement "e" option for popen to open file descriptor with the
5269 close-on-exec flag set. Implemented by Ulrich Drepper.
5271 * Implement "b" mode for fmemopen. In this mode writes writes don't
5272 implicitly add a NUL byte and seeks from the end of the buffer really
5273 use the buffer end, not the string length as the basis.
5274 Implemented by Ulrich Drepper.
5276 * Many functions, exported and internal, now atomically set the close-on-exec
5277 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5279 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5281 Implemented by Pravin Satpute.
5283 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5287 * The following bugs are resolved with this release:
5289 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5290 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5291 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5292 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5293 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5294 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5295 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5297 * New locales: bo_CN, bo_IN, shs_CA.
5299 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5301 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5302 Implemented by Pravin Satpute.
5304 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5306 * nscd caches now all timeouts for DNS entries
5307 Implemented by Ulrich Drepper.
5309 * nscd is more efficient and wakes up less often.
5310 Implemented by Ulrich Drepper.
5312 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5313 vdprintf, and obstack_vprintf.
5314 Implemented by Jakub Jelinek.
5316 * Faster memset for x86-64.
5317 Implemented by Harsha Jagasia and H.J. Lu.
5319 * Faster memcpy on x86.
5320 Implemented by Ulrich Drepper.
5322 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5323 Implemented by Ulrich Drepper.
5325 * Faster sqrt and sqrtf implemention for some PPC variants.
5326 Implemented by Steven Munroe.
5330 * The following bugs are resolved with this release:
5332 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5333 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5334 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5335 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5336 5071, 5103, 5104, 5112, 5113, 5184, 5186
5338 * More checking functions: fread, fread_unlocked, open*, mq_open.
5339 Implemented by Jakub Jelinek and Ulrich Drepper.
5341 * Extend fortification to C++. Implemented by Jakub Jelinek.
5343 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5344 by not recognizing 'a' as a modifier when those specs are requested.
5345 Implemented by Jakub Jelinek.
5347 * PPC optimizations to math and string functions.
5348 Implemented by Steven Munroe.
5350 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5351 options to be passed. Implemented by Ulrich Drepper.
5353 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5355 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5356 Implemented by Ulrich Drepper.
5358 * Handle private futexes in the NPTL implementation.
5359 Implemented by Jakub Jelinek and Ulrich Drepper.
5361 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5362 Implemented by Roland McGrath and Ulrich Drepper.
5364 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5366 * SHA-256 and SHA-512 based password encryption.
5367 Implemented by Ulrich Drepper.
5369 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5370 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5373 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5374 Implemented by Ulrich Drepper.
5378 * The following bugs are resolved with this release:
5380 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5381 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5382 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5383 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5384 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5385 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5386 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5389 * New Linux interfaces: epoll_pwait, sched_getcpu.
5391 * New generic interfaces: strerror_l.
5393 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5397 * The following bugs are resolved with this release:
5399 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5400 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5401 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5402 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5403 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5404 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5405 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5406 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5407 3225, 3251, 3252, 3253, 3273
5409 * For Linux, the sorting of addresses returned by getaddrinfo now also
5410 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5411 Implemented by Ulrich Drepper.
5413 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5414 Implemented by Ulrich Drepper.
5416 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5418 * New iconv module for MIK. Contributed by Alexander Shopov.
5420 * For sites with broken group and/or passwd database, the auto-propagate
5421 option of nscd can prevent creating ID lookup entries from the results
5422 of a name lookup and vice versa. This usually is no problem but some
5423 site might have problems with the default behavior.
5424 Implemented by Ulrich Drepper.
5426 * Iterating over entire database in NIS can be slow. With the
5427 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5428 to trade time for memory. The entire database will be read at once.
5429 Implemented by Ulrich Drepper.
5431 * The interfaces introduced in RFC 3542 have been implemented by
5434 * Support for the new ELF hash table format was added by Ulrich Drepper.
5436 * Support for priority inheritance mutexes added by Jakub Jelinek and
5439 * Support for priority protected mutexes added by Jakub Jelinek.
5441 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5442 or_IN, csb_PL, fy_NL, sr_ME.
5446 * More overflow detection functions.
5448 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5449 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5451 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5452 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5453 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5454 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5455 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5456 by Masahide Washizawa.
5458 * It is now possible to install audit libraries for the dynamic linker using
5459 LD_AUDIT. Implemented by Ulrich Drepper.
5461 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5462 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5463 For a libc and libpthread that works well on Linux 2.4 kernels, we
5464 recommend using the stable 2.3 branch.
5466 * The new function open_wmemstream acts like open_memstream,
5467 but uses a wchar_t wide character buffer.
5469 * The new function ppoll is an improved version of poll, similar to pselect.
5471 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5472 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5473 renameat, unlinkat, linkat, symlinkat, readlinkat.
5475 * New Linux kernel system calls: unshare,
5476 inotify_init, inotify_add_watch, inotify_rm_watch.
5478 * The euidaccess function is now also known by the alias eaccess,
5479 for compatibility with some other systems.
5481 * Timezone data updated to 2006b version.
5485 * The following bugs are resolved with this release:
5487 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5488 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5489 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5490 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5491 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5492 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5494 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5496 * As of this release, GCC 4 can be used to compile the C Library.
5498 * Timezone data updated to 2005m version.
5502 * The following bugs are resolved with this release:
5504 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5505 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5506 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5507 777, 787, 821, 822, 823, 825
5509 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5513 * Support for RFC 3678. Real implementations exist only for Linux so far.
5514 Implemented by Ulrich Drepper.
5516 * nscd can now cache entries persistently. Expiring entries are reloaded.
5517 For speedups the cache can be shared in memory with client processes.
5518 Implemented by Ulrich Drepper.
5520 * nscd can now perform SELinux checks.
5521 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5523 * getaddrinfo queries are now cached. Canonical name lookup is performed
5525 Implemented by Ulrich Drepper.
5527 * The nothrow function attribute is used when headers are used by gcc when
5528 compiling C code. This can avoid significant amounts of exception
5531 * The malloc functions perform more error checking and are stricter when
5532 it comes to reacting on errors. The default action is to terminate
5533 the process after showing an error message. Implemented by Ulrich Drepper.
5535 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5536 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5538 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5539 namespaces using the new function dlmopen(). This feature is of course,
5540 like most other dynamic loading functionality, not available in statically
5541 linked applications. Implemented by Ulrich Drepper.
5543 * Low-overhead boundary checking variants of string and some stdio functions
5544 were added. These are to be used in conjunction with a gcc patch by
5545 Jakub Jelinek which adds calls to these functions if possible.
5546 Implemented by Jakub Jelinek and Ulrich Drepper.
5548 * Old code for several operating systems and machine architectures that
5549 have not been in working condition in a long time have been removed from
5550 the main source tree maintained by the GNU C Library's maintainers.
5551 These files are now reside in the separate `ports' source module
5552 that is usable as an add-on when building the library.
5556 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5557 interrogate the dynamic linker, compatible with the Solaris interface.
5559 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5560 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5562 * getifaddrs now uses the netlink interface on Linux to get its information.
5563 Implemented by Thorsten Kukuk.
5565 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5566 Implemented by Ulrich Drepper.
5568 * support for non-executable stacks on x86 has been added. Changes mostly
5571 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5574 * getaddrinfo now performs destination address selection according to
5579 * Thread-safe interfaces for many functions that access locale data
5580 were added in version 2.3, but these features were omitted from NEWS.
5581 Many functions have variants with an `_l' suffix that take a `locale_t'
5582 object as a parameter rather than consulting the current locale.
5583 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5584 create and maintain `locale_t' objects. Additionally, the new function
5585 `uselocale' sets "the current locale" (as used by functions not so
5586 parameterized) set for an individual thread. These features were added
5587 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5589 * The functions getresuid, getresgid, setresuid, and setresgid, which
5590 have long been available on Linux, are now declared in <unistd.h>
5591 and are now also available on the Hurd.
5593 * ELF thread-local storage support (TLS) now works on x86-64.
5595 * The new dynamic string token $LIB is expanded in shared library names.
5596 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5598 * Aldy Hernandez contributed complete software floating point support for
5599 PowerPC machines with no FPU.
5601 * fexecve is implemented on Linux.
5603 * The `btowc' function should work at least twice as fast due to
5604 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5606 * With approriate thread add-ons cancelable functions are now implemented
5607 in libc.so as well. No need to call the function in libpthread. This
5608 change allowed to finally disable the incorrect and expensive handling
5609 of weak definition in ld.so.
5611 * Yet more PLT entries in libc.so have been removed. We finally arrived
5612 at the bare minimum. Startup times improved appropriately.
5614 * Support for the new Linux/x86 system call interface was added. The
5615 AT_SYSINFO auxiliary vector entry is recognized and handled.
5619 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5622 * iconv (the program and the interface) now accepts empty names (excluding
5623 options like //TRANSLIT) to mean "use charset of current locale".
5625 * localedef can now transliterate characters in strings which are not in
5626 the provided charmap. The information from the input locale is used.
5628 * Prelinking support was added for ELF targets. This requires additional
5629 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5631 * Read-only stdio streams now use mmap to speed up operation by eliminating
5632 copying and buffer underflows. To use add 'm' to the mode string of
5633 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5635 * The malloc functions were completely rewritten by Wolfram Gloger based
5636 on Doug Lea's malloc-2.7.0.c.
5638 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5639 implementation of regex.
5641 * Bruno Haible upgraded the iconv and locale implementation to support
5644 * Contents of the LC_* and LANG environment variables in the CEN style are
5645 not recognized anymore. It never was used. Change by Ulrich Drepper.
5647 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5648 thread-local storage (TLS) ABI on some platforms.
5649 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5651 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5652 EUC-JISX0213, and TSCII.
5654 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5655 BSD-compatible interface for getting all network interface addresses.
5656 Implementation for IPv4 by Roland McGrath.
5658 * Loading of locale data is faster due to the introduction of a locale
5659 archive. Implemented by Roland McGrath and Ulrich Drepper.
5661 * Startup times are significantly reduced by not using exported functions
5662 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5665 * Steven Munroe contributed a port to PowerPC64/Linux.
5669 * The Hurd now uses the GNU libio implementation of stdio rather than the
5670 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5672 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5673 with the same behavior as the Linux system call of the same name.
5677 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5678 128-bit long double format.
5680 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5681 IBM1161, and IBM1162 charsets.
5683 * Andreas Jaeger contributed a port to x86-64/Linux.
5685 * Peter Bruin contributed a port to PowerPC/Hurd.
5687 * libc functions using I/O streams now can handle wide-oriented streams
5690 * optimizations in the dynamic linker. Binaries created by recent binutils
5691 versions start up quicker due to reduced time spent on relocations.
5693 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5697 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5698 asinh, atanh, j0 for the 128-bit long double format.
5700 * Bruno Haible updated all the code handling Unicode in some form to
5701 support Unicode 3.1.
5703 * Speed of regex for single-byte locales is back to previous levels.
5704 Patch by Isamu Hasegawa.
5706 * Alpha, SPARC, and IA-64 now also using floating stacks.
5708 * Startup time of internationalized applications greatly improved through
5709 iconv cache. Use iconvconfig to generate the cache file.
5710 Contributed by Ulrich Drepper.
5712 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5713 severe performance problems. Patch by David Mosberger.
5715 * The Hurd port got a lot more functionality like AIO, various stdio
5716 extensions, etc. Mainly done by Roland McGrath.
5718 * mtrace can now lookup symbols in shared libraries.
5722 * Intel's IA-64 math library is largely integrated. It provides fast and
5723 accurate implementatations for most basic and standard math functions
5724 in float, double, and long double format.
5726 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5727 and asin for the 96-bit long double format and asin, log, tan for the
5728 128-bit long double format.
5730 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5731 The basic double functions exist today. Contributed by Abraham Ziv
5732 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5733 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5735 * An asynchronous name lookup library was added. The interface is designed
5736 after POSIX AIO. The proposal was circulated beforehand to get comments.
5737 No negative ones came in. Implemented by Ulrich Drepper.
5739 * Port to S390/64bit contributed by Martin Schwidefsky
5740 <schwidefsky@de.ibm.com>.
5742 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5743 of functions for Linux/IA-64.
5745 * The RPC code is now thread safe. Threads can now use the same service
5746 of different services at the same time. Patch by Eric Norum
5747 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5749 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5750 family of functions for Linux/S390.
5752 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5753 of functions for Linux/x86.
5755 * Port to Linux/CRIS contributed by Axis Communications.
5759 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5760 we can now check for namespace violations and missing declarations. The
5761 result is that almost all headers are now Unix-compliant (as defined in
5762 the upcoming XPG6). The negative side is that some programs might need
5763 corrections, too, if they depend on the incorrect form of the headers in
5764 previous versions which defined too many symbols and included too many
5767 * regex now handles multibyte character sets correctly.
5768 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5770 * iconv (the program) does now conform to the upcoming XPG6 and handles
5771 charmaps. Instead of the charset names the path of charmaps can be
5772 provided and the conversion happens based on this data.
5773 Contributed by Ulrich Drepper.
5775 * The locale program now provides detailed information about the installed
5780 only lists the names of the supported locales
5784 provides details such as country, language, and codeset name.
5785 Contributed by Ulrich Drepper.
5789 * The gencat program now parses the input file according to the charset
5790 selected by the LC_CTYPE category. This is important for stateful
5791 character sets. To make generating catalogs easier there is a way
5792 to overwrite the charset selected by the locale: before the first
5793 message or $ quote line the catalog can contain a line like
5795 $ codeset=ISO-8859-2
5797 to select the charset (ISO-8859-2 in this case).
5799 Implemented by Shinya Hanataka and Ulrich Drepper.
5801 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5802 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5803 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5805 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5806 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5808 * The LANGUAGE environment variable is now ignored unless the locale is
5809 changed from the default "C" locale.
5811 * The usual bug fixes.
5815 * Greg McGary added runtime support for bounds checking using gcc's
5816 new -fbounded-pointers option. ix86 target is complete. PowerPC
5819 * Thorsten Kukuk added secure mode support to nscd.
5821 * The Berkeley db libraries have been removed.
5823 Related, the nss_db module is now in a separate package since it
5824 obviously requires a database library being available.
5826 * Wide character I/O streams implemented by Ulrich Drepper.
5828 * Functions from the extended socket API added by Ulrich Drepper.
5830 * Functions feenableexcept and fedisableexcept to control the
5831 behaviour of individual exceptions have been added by Andreas Jaeger.
5833 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5835 * The resolver code has been updated from bind 8.2.3-T5B which supports
5836 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5839 This change could in some situations effect backward compatibility. Since
5840 now `_res' is a thread-local instead of a global variable, modifying it
5841 in one thread does not have any effect in other threads.
5843 The resolver library was also extended to allow IPv6 as the transport
5844 protocol for the requests. This work was done by Stig Venaas.
5846 * Compatibility code for K&R C compilers has been removed from the
5847 header files. A ISO C compiler is needed to use the library
5848 (conforming to either C89 or C99 standard).
5850 * Complete rewrite of the localedef program to support multibyte character
5851 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5852 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5853 Implemented by Ulrich Drepper.
5855 Bruno Haible significantly improved the generation and use of the data
5856 structures for the wide character tables.
5858 * Plural handling in gettext implemented by Ulrich Drepper.
5860 * The utmp daemon has been removed.
5862 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5864 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5867 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5869 * POSIX barriers implemented by Kaz Kylheku.
5871 * POSIX spawn function family implemented by Ulrich Drepper.
5873 * POSIX spinlocks are now available.
5875 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5877 * the configure option --enable-kernel=X.Y.Z allows to strip out
5878 compatibility for kernel versions before X.Y.Z. This is currently only
5879 implemented for Linux.
5881 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5882 field sin6_scope_id. This means that all programs using IPv6 should be
5883 recompiled. Don't expect binary compatibility with previous glibc
5886 * various conversion modules for IBM character sets contributed by
5889 * IA-64 port by Jes Sorensen and HJ Lu.
5903 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5905 * New xdr functions are added; some rpc functions are now 64bit clean.
5907 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5909 * Fixed known incompatibilities with glibc 2.0.
5911 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5913 * Optimized a number of functions (especially the ELF dynamic loader).
5915 * Update timezone data files.
5917 * lots of charmaps corrections
5919 * some new locale definitions and charmaps
5924 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5925 conform to POSIX member type requirements. Symbol versions have been
5926 adjusted as needed within the library, and for direct use by applications,
5927 but there is potential for problems if third-party libraries use
5928 struct timeval as part of their interface. This does not present
5929 a problem for X and other "essential" system libraries.
5931 * An additional locale model to support C++ Standard Library locale
5932 model and probably more was implemented by Ulrich Drepper.
5934 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5937 * Miles Bader provided the `argp' function family to support hierachical
5938 command line argument parsing, layered on top of getopt.
5940 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5942 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5945 * scanf recognizes the %a and %A format for scanning floating point numbers.
5947 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5948 information and interfaces for the available integer types.
5950 * about 130 new math functions were added to implement the ISO C9x math
5953 * the new header <complex.h> contains definitions of the complex math
5954 functions from ISO C 9X.
5956 * the new header <tgmath.h> defines generic macros to use complex or
5957 real valued functions.
5959 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5961 * Andreas Jaeger provided a test suite for the math library.
5963 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5965 * Ulrich Drepper added character set conversion functions (iconv).
5967 * Optimized string functions have been added.
5969 * The localedata addon is now part of glibc.
5971 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5973 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5974 daemon for NSS (nscd).
5976 Missing a better place here are some numbers on improvements. Under
5977 Linux 2.1.125 un-tar-ing the kernel sources takes
5981 using local files 12.19s 6.88s 22.91s
5983 using NIS 13.92s 8.91s 26.34s
5985 using NIS & nscd 10.37s 7.34s 25.30s
5987 using NIS+ 27.57s 30.37s 640.46s
5989 using NIS+ & nscd 10.25s 7.83s 26.51s
5991 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5993 Keep in mind that non-namelookup related operations dominate above times.
5994 It was just a common complain that using NIS+ unpacking the kernel is
5997 [1] The old nscd implementation is not available anymore since it was
5998 distributed with glibc up to version 2.0.98 and thus is now replaced.
6000 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6002 * Mark Kettenis provided a Hesiod NSS module.
6004 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6005 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6007 * rcmd can now handle netgroups (Dick Streefland).
6009 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6012 * Support for the IPv6 protocol has been added to the socket API, as per the
6013 latest draft standards.
6015 * Support for Linux 2.2 has been added.
6017 * Interface changes relative to the latest 2.0.x release:
6018 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6019 addseverity NEW: Unix98
6020 alphasort64 NEW: LFS
6021 argp_err_exit_status NEW: argp, GNU ext
6022 argp_error NEW: argp, GNU ext
6023 argp_failure NEW: argp, GNU ext
6024 argp_help NEW: argp, GNU ext
6025 argp_parse NEW: argp, GNU ext
6026 argp_program_bug_address NEW: argp, GNU ext
6027 argp_program_version NEW: argp, GNU ext
6028 argp_program_version_hook NEW: argp, GNU ext
6029 argp_state_help NEW: argp, GNU ext
6030 argp_usage NEW: argp, GNU ext
6031 authdes_create NEW: Secure RPC
6032 authdes_getucred NEW: Secure RPC
6033 authdes_pk_create NEW: Secure RPC
6034 backtrace NEW: GNU ext.
6035 backtrace_symbols NEW: GNU ext.
6036 backtrace_symbols_fd NEW: GNU ext.
6038 cacosf NEW: ISO C 9x
6039 cacosh NEW: ISO C 9x
6040 cacoshf NEW: ISO C 9x
6041 cacoshl NEW: ISO C 9x
6042 cacosl NEW: ISO C 9x
6049 casinf NEW: ISO C 9x
6050 casinh NEW: ISO C 9x
6051 casinhf NEW: ISO C 9x
6052 casinhl NEW: ISO C 9x
6053 casinl NEW: ISO C 9x
6055 catanf NEW: ISO C 9x
6056 catanh NEW: ISO C 9x
6057 catanhf NEW: ISO C 9x
6058 catanhl NEW: ISO C 9x
6059 catanl NEW: ISO C 9x
6060 cbc_crypt NEW: Secure RPC
6064 ccoshf NEW: ISO C 9x
6065 ccoshl NEW: ISO C 9x
6071 cimagf NEW: ISO C 9x
6072 cimagl NEW: ISO C 9x
6073 clearerr_locked REMOVED
6074 clntunix_create NEW: sunrpc ext
6076 clog10 NEW: ISO C 9x
6077 clog10f NEW: ISO C 9x
6078 clog10l NEW: ISO C 9x
6088 cprojf NEW: ISO C 9x
6089 cprojl NEW: ISO C 9x
6091 crealf NEW: ISO C 9x
6092 creall NEW: ISO C 9x
6097 csinhf NEW: ISO C 9x
6098 csinhl NEW: ISO C 9x
6101 csqrtf NEW: ISO C 9x
6102 csqrtl NEW: ISO C 9x
6106 ctanhf NEW: ISO C 9x
6107 ctanhl NEW: ISO C 9x
6109 des_setparity NEW: Secure RPC
6110 ecb_crypt NEW: Secure RPC
6111 endutxent NEW: Unix98
6113 exp10f NEW: ISO C 9x
6114 exp10l NEW: ISO C 9x
6118 fattach NEW: STREAMS
6119 fdetach NEW: STREAMS
6123 feclearexcept NEW: ISO C 9x
6124 fegetenv NEW: ISO C 9x
6125 fegetexceptflag NEW: ISO C 9x
6126 fegetround NEW: ISO C 9x
6127 feholdexcept NEW: ISO C 9x
6129 feraiseexcept NEW: ISO C 9x
6130 ferror_locked REMOVED
6131 fesetenv NEW: ISO C 9x
6132 fesetexceptflag NEW: ISO C 9x
6133 fesetround NEW: ISO C 9x
6134 fetestexcept NEW: ISO C 9x
6135 feupdateenv NEW: ISO C 9x
6136 fflush_locked REMOVED
6140 fgets_unlocked NEW: GNU ext.
6141 fileno_locked REMOVED
6153 fputc_locked REMOVED
6154 fputs_unlocked NEW: GNU ext.
6155 fread_unlocked NEW: GNU ext.
6160 fstatvfs NEW: Unix98
6164 ftruncate64 NEW: LFS
6166 fwrite_unlocked NEW: GNU ext.
6167 gai_strerror NEW: IPv6
6171 getchar_locked REMOVED
6173 getdate_err NEW: Unix98
6174 getdate_r NEW: GNU ext.
6176 getnameinfo NEW: IPv6
6177 getnetname NEW: Secure RPC
6178 getpmsg NEW: STREAMS
6179 getpt NEW: Unix98 PTY
6180 getrlimit64 NEW: LFS
6181 getutxent NEW: Unix98
6182 getutxid NEW: Unix98
6183 getutxline NEW: Unix98
6184 glob64 NEW: GNU ext.
6185 globfree64 NEW: GNU ext.
6186 gnu_get_libc_release NEW: GNU ext.
6187 gnu_get_libc_version NEW: GNU ext.
6188 grantpt NEW: Unix98 PTY
6189 host2netname NEW: Secure RPC
6191 iconv_close NEW: iconv
6192 iconv_open NEW: iconv
6193 if_freenameindex NEW: IPv6
6194 if_indextoname NEW: IPv6
6195 if_nameindex NEW: IPv6
6196 if_nametoindex NEW: IPv6
6197 in6addr_any NEW: IPv6
6198 in6addr_loopback NEW: IPv6
6199 inet6_isipv4mapped NEW: IPv6
6200 isastream NEW: STREAMS
6201 iswblank NEW: GNU ext.
6202 key_decryptsession NEW: Secure RPC
6203 key_decryptsession_pk NEW: Secure RPC
6204 key_encryptsession NEW: Secure RPC
6205 key_encryptsession_pk NEW: Secure RPC
6206 key_gendes NEW: Secure RPC
6207 key_get_conv NEW: Secure RPC
6208 key_secretkey_is_set NEW: Secure RPC
6209 key_setnet NEW: Secure RPC
6210 key_setsecret NEW: Secure RPC
6211 llrint NEW: ISO C 9x
6212 llrintf NEW: ISO C 9x
6213 llrintl NEW: ISO C 9x
6214 llround NEW: ISO C 9x
6215 llroundf NEW: ISO C 9x
6216 llroundl NEW: ISO C 9x
6221 lrintf NEW: ISO C 9x
6222 lrintl NEW: ISO C 9x
6223 lround NEW: ISO C 9x
6224 lroundf NEW: ISO C 9x
6225 lroundl NEW: ISO C 9x
6227 makecontext NEW: Unix98
6228 mempcpy NEW: GNU ext.
6231 modify_ldt NEW: kernel
6235 nearbyint NEW: ISO C 9x
6236 nearbyintf NEW: ISO C 9x
6237 nearbyintl NEW: ISO C 9x
6238 netname2host NEW: Secure RPC
6239 netname2user NEW: Secure RPC
6240 nexttoward NEW: ISO C 9x
6241 nexttowardf NEW: ISO C 9x
6242 nexttowardl NEW: ISO C 9x
6246 passwd2des NEW: Secure RPC
6248 pow10f NEW: GNU ext.
6249 pow10l NEW: GNU ext.
6252 printf_size NEW: GNU ext.
6253 printf_size_info NEW: GNU ext.
6254 profil_counter REMOVED
6255 pthread_mutexattr_getkind_np REPLACED
6256 pthread_mutexattr_setkind_np REPLACED
6257 ptsname NEW: Unix98 PTY
6258 ptsname_r NEW: Unix98 PTY
6260 putchar_locked REMOVED
6261 putgrent NEW: GNU ext.
6263 putpmsg NEW: STREAMS
6264 pututxline NEW: Unix98
6268 readdir64_r NEW: LFS
6269 remquo NEW: ISO C 9x
6270 remquof NEW: ISO C 9x
6271 remquol NEW: ISO C 9x
6273 roundf NEW: ISO C 9x
6274 roundl NEW: ISO C 9x
6276 scalbln NEW: ISO C 9x
6277 scalblnf NEW: ISO C 9x
6278 scalblnl NEW: ISO C 9x
6280 sendfile NEW: kernel
6281 setcontext NEW: Unix98
6282 setrlimit64 NEW: LFS
6283 setutxent NEW: Unix98
6285 sigignore NEW: Unix98
6286 sigqueue NEW: POSIX.1b
6287 sigrelse NEW: Unix98
6288 sigset NEW: POSIX.1b
6289 sigtimedwait NEW: POSIX.1b
6290 sigwaitinfo NEW: POSIX.1b
6291 sincos NEW: GNU ext.
6292 sincosf NEW: GNU ext.
6293 sincosl NEW: GNU ext.
6297 strcasestr NEW: GNU ext.
6298 strtoimax NEW: ISO C 9x
6299 strtoumax NEW: ISO C 9x
6300 strverscmp NEW: GNU ext.
6301 svcauthdes_stats NEW: Secure RPC
6302 svcunix_create NEW: sunrpc etx
6303 svcunixfd_create NEW: sunrpc ext
6304 swapcontext NEW: Unix98
6305 tcgetsid NEW: Unix98 PTY
6306 tdestroy NEW: GNU ext.
6307 tgamma NEW: ISO C 9x
6308 tgammaf NEW: ISO C 9x
6309 tgammal NEW: ISO C 9x
6313 truncf NEW: ISO C 9x
6314 truncl NEW: ISO C 9x
6316 unlockpt NEW: Unix98 PTY
6317 updwtmpx NEW: Unix98
6318 user2netname NEW: Secure RPC
6319 utmpxname NEW: Unix98
6320 versionsort NEW: GNU ext.
6321 versionsort64 NEW: GNU ext.
6323 wcscasecmp NEW: GNU ext.
6324 wcsncasecmp NEW: GNU ext.
6325 wcsnlen NEW: GNU ext.
6326 wcstoimax NEW: ISO C 9x
6327 wcstoll NEW: ISO C 9x
6328 wcstoull NEW: ISO C 9x
6329 wcstoumax NEW: ISO C 9x
6331 wordexp NEW: POSIX.2
6332 wordfree NEW: POSIX.2
6333 write_profiling REMOVED
6334 xdecrypt NEW: Secure RPC
6335 xdr_authdes_cred NEW: Secure RPC
6336 xdr_authdes_verf NEW: Secure RPC
6337 xdr_cryptkeyarg NEW: Secure RPC
6338 xdr_cryptkeyarg2 NEW: Secure RPC
6339 xdr_cryptkeyres NEW: Secure RPC
6340 xdr_getcredres NEW: Secure RPC
6341 xdr_key_netstarg NEW: Secure RPC
6342 xdr_key_netstres NEW: Secure RPC
6343 xdr_keybuf NEW: Secure RPC
6344 xdr_keystatus NEW: Secure RPC
6345 xdr_netnamestr NEW: Secure RPC
6346 xdr_sizeof NEW: Secure RPC
6347 xdr_unixcred NEW: sunrpc ext
6348 xencrypt NEW: Secure RPC
6349 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6360 * inet_ntoa is thread-safe
6362 * updwtmp is moved from libutil to libc
6364 * rewrite of cbrt function
6366 * update of timezone data
6380 * add atoll function
6382 * fix complex problems in Berkeley DB code
6384 * fix math functions
6388 * fixed lots of header problems (especially Linux/GNU specific)
6390 * dynamic loader preserves all registers
6392 * Roland McGrath provided support for handling of auxiliary objects in
6393 the ELF dynamic loader.
6395 * support for parallel builds is improved
6399 * GNU extensions are no longer declared by default. To enable them you
6400 must define the macro `_GNU_SOURCE' in your program or compile with
6403 * The library has changed from using GNU ld symbol aliases to using weak
6404 symbols where available. The ELF object file format supports weak
6405 symbols; GNU ld also supports weak symbols in the a.out format. (There
6406 is also now support for other GNU ld extensions in ELF. Use the
6407 `--with-elf' option to configure to indicate you have ELF, and
6408 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6409 of many files which contained only symbol aliases, reducing the size of
6410 the source and the compiled library; many other files were renamed to
6411 less cryptic names previously occupied by the symbol alias files.
6412 There is a new header file <elf.h> for programs which operate on
6413 files in the ELF format.
6415 * Converted to Autoconf version 2, so `configure' has more options.
6416 Run `configure --help' to see the details.
6418 * The library can now be configured to build profiling, highly-optimized
6419 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6420 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6421 `configure' enable building these extra libraries. The shared library is
6422 built by default when using both ELF and GNU ld. When shared libraries
6423 are enabled, the new library `-ldl' is available for arbitrary run-time
6424 loading of shared objects; its interface is defined in <dlfcn.h>. The
6425 new header file <link.h> gives access to the internals of the run-time
6426 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6427 application of same name on other systems and it provides information
6428 about dynamically linked binaries.
6430 * The C library now provides the run-time support code for profiling
6431 executables compiled with `-pg'. Programs can control the profiling code
6432 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6433 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6434 the support for this file format was contributed by David Mosberger-Tang.
6436 * The math code has been replaced with a math library based on fdlibm from
6437 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6438 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6439 functions. The math functions now reside in a separate library, so
6440 programs using them will need to use `-lm' their linking commands.
6442 * John C. Bowman contributed optimized ix87 assembler inline functions.
6444 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6445 mechanism similar to that found in Solaris 2. This is now used for the
6446 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6447 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6448 file controls what services are used for each individual database. This
6449 works by loading shared libraries with names specified in `nsswitch.conf',
6450 so service modules can be changed or added at any time without even
6451 relinking any program. Currently there are the file, db, and NIS based
6452 NSS services available.
6454 * The new functions `strtoq' and `strtouq' parse integer values from
6455 strings, like `strtol' and `strtoul', but they return `long long int' and
6456 `unsigned long long int' values, respectively (64-bit quantities).
6458 * The new functions `strtof' and `strtold' parse floating-point values from
6459 strings, like `strtod', but they return `float' and `long double' values,
6460 respectively (on some machines `double' and `long double' are the same).
6462 * Ulrich Drepper has contributed new implementations of the floating-point
6463 printing and reading code used in the `printf' family of functions and
6464 `strtod', `strtof', and `strtold'. These new functions are perfectly
6465 accurate, and much faster than the old ones.
6467 * The implementation of the POSIX locale model was completely rewritten by
6468 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6469 to compile the POSIX locale definition.
6471 * The former dummy implementations of the strcoll and strxfrm function are
6472 now replaced by fully functional code contributed by Ulrich Drepper. The
6473 collation information comes from the POSIX locale definitions.
6475 * The new header <langinfo.h> defines an interface for accessing
6476 various locale-dependent data (using the locale chosen with `setlocale').
6478 * Ulrich Drepper has contributed a new suite of functions for operation on
6479 wide-character and multibyte-character strings, in <wchar.h>;
6480 and classification and case conversion of wide characters, in <wctype.h>.
6481 These new functions are conforming to the ISO C, Amendement 1 specification.
6483 * There is now a second implementation of the standard I/O library available.
6484 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6485 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6487 * You can now use positional parameter specifications in format strings
6488 for the `printf' and `scanf' families of functions. For example,
6489 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6490 ``Number 6, Mr Jones''. This is mainly useful when providing different
6491 format strings for different languages, whose grammars may dictate
6492 different orderings of the values being printed. To support this
6493 feature, the interface for `register_printf_handler' has changed; see
6494 the header file <printf.h> for details.
6496 * The `printf' and `scanf' families of functions now understand a new
6497 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6498 to group numbers as indicated by the locale; for `scanf' and friends, this
6499 says to accept as valid only a number with all the proper grouping
6500 separators in the right places. In the default "C" locale, numbers are
6501 not grouped; but locales for specific countries will define the usual
6502 conventions (i.e. separate thousands with `,' in the US locale).
6504 * The pgrp functions have been regularized, slightly incompatibly but much
6505 less confusingly. The core functions are now `getpgid' and `setpgid',
6506 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6507 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6508 provided for compatibility. There is no longer an incompatible `getpgrp'
6509 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6511 * The new header file <fts.h> and suite of functions simplify programs that
6512 operate on directory trees. This code comes from 4.4 BSD.
6514 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6515 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6516 NSS scheme used in glibc.
6518 * There is a new malloc debugging hook `__memalign_hook'.
6520 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6521 `unsigned int' in <sys/types.h>. These are for compatibility only and
6522 their use is discouraged.
6524 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6525 done differently, so that it works even without GNU ld.
6527 * New function `euidaccess' checks allowed access to a file like `access',
6528 but using the effective IDs instead of the real IDs.
6530 * The time zone data files have been updated for the latest and greatest
6531 local time conventions of the countries of the world.
6533 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6536 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6537 for formatting floating-point numbers. They are provided only for
6538 compatibility; new programs should use `sprintf' instead. There are
6539 also equivalent function for the `long double' floating-point type and
6540 all functions also exist in a reentrant form.
6542 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6543 functions for maintaining the login-record files (primarily of use to
6544 system programs such as `login'), and convenient functions for
6545 allocating and initializing a pseudo-terminal (pty) device.
6547 * Ulrich Drepper has contributed new support for System V style
6548 shared memory and IPC on systems that support it.
6550 * Ulrich Drepper has contributed several miscellaneous new functions found
6551 in System V: The `hsearch' family of functions provide an effective
6552 implementation of hash tables; `a64l' and `l64a' provide a very simple
6553 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6556 * Ulrich Drepper has contributed new reentrant counterparts for the
6557 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6559 * Ulrich Drepper has contributed new, highly-optimized versions of several
6560 string functions for the i486/Pentium family of processors.
6562 * Ulrich Drepper has updated the Linux-specific code, based largely
6563 on work done in Hongjiu Lu's version of GNU libc for Linux.
6564 The GNU library now supports Linux versions 2.0.10 and later,
6565 using the ELF object file format (i[3456]86-*-linux).
6567 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6569 * David Mosberger-Tang and Richard Henderson have ported the C library
6570 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6571 dynamic linking support for ELF/Alpha.
6573 * Richard Henderson contributed several Alpha optimized assembler function
6574 for arithmetic and string handling.
6576 * Ulrich Drepper has contributed a new set of message catalog functions to
6577 support multiple languages using the <libintl.h> interface, for use with
6578 his new package GNU gettext. Translation volunteers have contributed
6579 catalogs of the library's messages in Spanish, German, and Korean.
6581 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6582 program and the `catgets' function for reading the catalog files it
6583 creates. (The <libintl.h> interface is preferred; we include the
6584 <nl_types.h> interface using `catgets' only for source compatibility with
6585 programs already written to use it.)
6587 * New header file <values.h> gives SVID-compatible names for <limits.h>
6590 * Various new macros, declarations, and small header files for compatibility
6593 * New function `group_member' is a convenient way to check if a process has
6594 a given effective group ID.
6596 * When using GCC 2.7 and later, the socket functions are now declared in a
6597 special way so that passing an argument of type `struct sockaddr_in *',
6598 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6599 `struct sockaddr *' type, does not generate a type-clash warning.
6601 * New function `error' declared in header file <error.h> is a convenient
6602 function for printing error messages and optionally exiting; this is the
6603 canonical function used in GNU programs. The new functions `err', `warn',
6604 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6605 doing the same thing.
6607 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6608 POSIX.2 `glob' function to do ~ and {...} expansion.
6610 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6611 `clearenv' which is used in POSIX.9 is also available.
6613 * New function `getsid' returns session ID number on systems that support it.
6615 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6616 files <db.h> and <mpool.h> provide a rich set of functions for several
6617 types of simple databases stored in memory and in files, and <ndbm.h> is
6618 an old `ndbm'-compatible interface using the `db' functions. Link with
6619 `-ldb' to get these functions.
6621 * New macro `strdupa' copies a string like `strdup', but uses local stack
6622 space from `alloca' instead of dynamic heap space from `malloc'.
6624 * New function `strnlen' is like `strlen' but searches only a given maximum
6625 number of characters for the null terminator. `stpncpy', `strndup' and
6626 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6629 * New function `statfs' in header <sys/statfs.h>.
6631 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6632 provide convenient functions for operating on blocks of null-terminated
6635 * A new suite of functions in <utmp.h> handle all the details of reading
6636 and writing the utmp file.
6638 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6641 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6642 completely POSIX compliant and also implemented the extended functionality
6643 to handle alternate digit representation and alternate era date formats.
6645 * Ulrich Drepper provided an implementation of the `strptime' function
6646 defined in XPG4.2 which transforms a string into a `struct tm' value.
6648 * Paul Eggert provided the tzselect shell script as part of the timezone
6649 code. The shell script makes it easy to select the correct timezone
6652 * The implementation of the malloc family of functions is completely replaced
6653 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6654 The implementation uses the mmap function (if available) and it is
6655 optimized for the use in multi threaded programs.
6657 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6658 functions. This new functionality is usable by specifying a special
6659 salt string and it is compatible with implementation on *BSD systems.
6661 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6662 `getsubopt' to handle second level command line options, `bsd_signal'
6663 to access BSD style `signal' functionality, the obsolete `regexp' style
6666 * the `lchown' function is available on system which support this
6669 * The implementation of the shadow password handling function was contributed
6672 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6674 * POSIX.1g support was added. The <sys/select.h> header is available,
6675 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6676 implementation of `getaddrinfo'.
6680 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6682 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6683 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6685 * The new function `daemon' from 4.4 BSD is useful for server programs that
6686 want to put themselves in the background.
6688 * Joel Sherrill has contributed support for several standalone boards that
6689 run without an operating system.
6691 * `printf', `scanf' and friends now accept a `q' type modifier for long
6692 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6694 * All of the code taken from BSD (notably most of the math and networking
6695 routines) has been updated from the BSD 4.4-Lite release.
6697 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6699 * The new functions `getdomainname' and `setdomainname' fetch or change the
6700 YP/NIS domain name. These are system calls which exist on systems which
6703 * The time zone data files have been updated for the latest international
6706 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6707 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6711 * The C library now includes support for Sun RPC, from Sun's free
6712 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6713 are included. (There is still no support for YP.)
6715 * Tom Quinn has contributed a port of the C library to SGI machines running
6716 Irix 4 (mips-sgi-irix4).
6718 * The new `lockf' function is a simplified interface to the locking
6719 facilities of `fcntl', included for compatibility.
6721 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6723 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6725 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6728 * The error message printed by `assert' for a failed assertion now includes
6729 the name of the program (if using GNU ld) and the name of the calling
6730 function (with versions of GCC that support this).
6732 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6734 * The library now includes the <sys/mman.h> header file and memory
6735 management functions `mmap', `munmap', `mprotect', `msync', and
6736 `madvise', on systems that support those facilities.
6738 * The interface for `mcheck' has changed slightly: the function called to
6739 abort the program when an allocation inconsistency is detected now takes
6740 an argument that indicates the type of failure. The new function
6741 `mprobe' lets you request a consistency check for a particular block at
6742 any time (checks are normally done only when you call `free' or `realloc'
6745 * It is now possible to easily cross-compile the C library, building on one
6746 system a library to run on another machine and/or operating system. All
6747 you need to do is set the variable `HOST_CC' in `configparms' to the
6748 native compiler for programs to run on the machine you are building on (a
6749 few generator programs are used on Unix systems); set `CC' to the
6752 * The new function `fexecve' (only implemented on the GNU system) executes
6753 a program file given a file descriptor already open on the file.
6757 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6758 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6760 * You can set the variable `libprefix' in `configparms' to specify a prefix
6761 to be prepended to installed library files; this makes it easy to install
6762 the GNU C library to be linked as `-lgnuc' or whatever.
6764 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6765 copies a limited number of characters from a string, and returns the
6766 address of the last character written.
6768 * You no longer need to check for whether the installed `stddef.h' is
6769 compatible with the GNU C library. configure now checks for you.
6771 * You can now define a per-stream `fileno' function to convert the
6772 stream's cookie into an integral file descriptor.
6774 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6775 allocates zero bytes of storage, and returns a unique pointer which
6776 you can pass to `realloc' or `free'. The behavior is undefined if
6777 you dereference this pointer.
6779 * The C library now runs on Sony NEWS m68k machines running either
6780 NewsOS 3 or NewsOS 4.
6782 * The new `syscall' function is a system-dependent primitive function
6783 for invoking system calls. It has the canonical behavior on Unix
6784 systems, including unreliable return values for some calls (such as
6785 `pipe', `fork' and `getppid').
6787 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6788 to `EAGAIN', which is the preferred name. On systems whose kernels
6789 use two distinct codes, the C library now translates EWOULDBLOCK to
6790 EAGAIN in every system call function.
6794 * The GNU C Library Reference Manual is now distributed with the library.
6795 `make dvi' will produce a DVI file of the printed manual.
6796 `make info' will produce Info files that you can read on line using C-h i
6797 in Emacs or the `info' program.
6798 Please send comments on the manual to bug-glibc-manual@gnu.org.
6800 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6802 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6804 * Jason Merrill has contributed a port to the Sequent Symmetry running
6805 Dynix version 3 (i386-sequent-dynix).
6807 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6808 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6810 * New function `memory_warnings' lets you arrange to get warnings when
6811 malloc is running out of memory to allocate, like Emacs gives you.
6813 * The C library now contains the relocating allocator used in Emacs 19 for
6814 its editing buffers. This allocator (ralloc) minimizes allocation
6815 overhead and fragmentation by moving allocated regions around whenever it
6816 needs to. You always refer to a ralloc'd region with a "handle" (a
6817 pointer to a pointer--an object of type `void **').
6819 * There is a new `printf' format: `%m' gives you the string corresponding
6820 to the error code in `errno'.
6822 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6823 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6824 pass, the `a' modifier says to fill in a `char **' you pass with a
6827 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6828 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6829 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6831 * `mkstemp' is a traditional Unix function to atomically create and open a
6832 uniquely-named temporary file.
6836 * The standard location for the file that says what the local timezone is
6837 has changed again. It is now `/usr/local/etc/localtime' (or more
6838 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6840 * The distribution no longer contains any files with names longer than 14
6843 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6844 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6846 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6850 * The configuration process has changed quite a bit. The `configure'
6851 script is now used just like the configuration scripts for other GNU
6852 packages. The `sysdeps' directory hierarchy is much rearranged.
6853 The file `INSTALL' explains the new scheme in detail.
6855 * The header files no longer need to be processed into ANSI C and
6856 traditional C versions. There is just one set of files to install, and
6857 it will work with ANSI or old C compilers (including `gcc -traditional').
6859 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6860 MIPS DECStation running Ultrix 4.
6862 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6863 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6864 made itself into a shared library.
6866 * Yet further improved support for the i386, running 4.3 BSD-like systems
6867 (such as Mach 3 with the Unix single-server), or System V.
6869 * New function `strncasecmp' to do case-insensitive string comparison
6870 with limited length.
6872 * New function `strsep' is a reentrant alternative to `strtok'.
6874 * New functions `scandir' and `alphasort' for searching directories.
6876 * New function `setenv' is a better interface to `putenv'.
6878 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6879 function for traversing a directory tree.
6881 * The GNU obstack package is now also part of the C library.
6882 The new function `open_obstack_stream' creates a stdio stream that
6883 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6884 formatted output directly to an obstack.
6886 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6887 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6889 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6891 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6892 things to your strings.
6894 * There are some new test programs: test-fseek, testmb, and testrand.
6896 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6897 These ports are not finished, but are a good starting place for really
6898 supporting those systems.
6900 * `/etc/localtime' is now the standard location for the file that says what
6901 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6902 This follows the general principle that `/etc' is the place for all local
6903 configuration files.
6905 * The C library header files now use `extern "C"' when used by the C++
6906 compiler, so the C library should now work with C++ code.
6908 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6909 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6912 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6913 function which uses the `merge sort' algorithm, and is said to be
6914 significantly faster than the old GNU `qsort' function. Merge sort is
6915 now the standard `qsort' function. The new algorithm can require a lot
6916 of temporary storage; so, the old sorting function is called when the
6917 required storage is not available.
6919 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6920 provides the Unix `crypt' function, plus some other entry points.
6922 * The code and header files taken from 4.4 BSD have been updated with the
6923 latest files released from Berkeley.
6925 ----------------------------------------------------------------------
6928 Permission is granted to anyone to make or distribute verbatim copies
6929 of this document as received, in any medium, provided that the
6930 copyright notice and this permission notice are preserved,
6931 thus giving the recipient permission to redistribute in turn.
6933 Permission is granted to distribute modified versions
6934 of this document, or of portions of it,
6935 under the above conditions, provided also that they
6936 carry prominent notices stating who last changed them.
6939 version-control: never