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 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
47 predefined as specified in TS 18661-1:2014.
49 * The exp10 functions in <math.h> now have a corresponding type-generic
52 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
54 * printf-family functions now support the %b format for output of
55 integers in binary, as specified in draft ISO C2X, and the %B variant
56 of that format recommended by draft ISO C2X.
58 * A new DSO sorting algorithm has been added in the dynamic linker that uses
59 topological sorting by depth-first search (DFS), solving performance issues
60 of the existing sorting algorithm when encountering particular circular
61 object dependency cases.
63 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
64 the two DSO sorting algorithms. The default setting of '2' uses the
65 new DFS-based algorithm. The setting '1' switches to the old
66 algorithm used in glibc 2.33 and earlier.
68 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
69 to be used by compilers for optimizing usage of 'memcmp' when its
70 return value is only used for its boolean status.
72 * Support for automatically registering threads with the Linux rseq
73 system call has been added. This system call is implemented starting
74 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
75 operations on per-cpu data. It allows user-space to perform updates
76 on per-cpu data without requiring heavy-weight atomic operations.
77 Automatically registering threads allows all libraries, including
78 libc, to make immediate use of the rseq support by using the
79 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
80 variables. The GNU C Library manual has details on integration of
81 Restartable Sequences.
83 * A symbolic link to the dynamic linker is now installed under
84 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
86 * All programs and the testsuite in glibc are now built as position independent
87 executables (PIE) by default on toolchains and architectures that support it.
88 Further, if the toolchain and architecture supports it, even static programs
89 are built as PIE and the resultant glibc can be used to build static PIE
90 executables. A new option --disable-default-pie has been added to disable
91 this behavior and get a non-PIE build. This option replaces
92 --enable-static-pie, which no longer has any effect on the build
95 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
96 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
97 or to use huge pages directly with mmap calls with the MAP_HUGETLB
98 flags). The former can improve performance when Transparent Huge Pages
99 is set to 'madvise' mode while the latter uses the system reserved
102 * The printf family of functions now handles the flagged %#m conversion
103 specifier, printing errno as an error constant (similar to strerrorname_np).
105 * The function _dl_find_object has been added. In-process unwinders
106 can use it to efficiently locate unwinding information for a code
109 * Support for OpenRISC running on Linux has been added. This port requires
110 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
115 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
116 64-bit file offsets (LFS default).
118 Deprecated and removed features, and other changes affecting compatibility:
120 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
121 has been removed since the first PT_LOAD segment is no longer executable
122 due to defaulting to -z separate-code.
124 * The r_version update in the debugger interface makes the glibc binary
125 incompatible with GDB binaries built without the following commits:
127 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
128 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
130 when audit modules or dlmopen are used.
132 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
134 * The --enable-static-pie option is no longer available. The glibc build
135 configuration script now automatically detects static-pie support in the
136 toolchain and architecture and enables it if available.
138 Changes to build and runtime requirements:
140 [Add changes to build and runtime requirements here]
142 Security related changes:
144 [Add security related changes here]
146 The following bugs are resolved with this release:
148 [The release manager will add the list generated by
149 scripts/list-fixed-bugs.py just before the release.]
156 * In order to support smoother in-place-upgrades and to simplify
157 the implementation of the runtime all functionality formerly
158 implemented in the libraries libpthread, libdl, libutil, libanl has
159 been integrated into libc. New applications do not need to link with
160 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
161 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
162 provided, so that the linker options keep working. Applications which
163 have been linked against glibc 2.33 or earlier continue to load the
164 corresponding shared objects (which are now empty). The integration
165 of those libraries into libc means that additional symbols become
166 available by default. This can cause applications that contain weak
167 references to take unexpected code paths that would only have been
168 used in previous glibc versions when e.g. preloading libpthread.so.0,
169 potentially exposing application bugs.
171 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
172 PTHREAD_STACK_MIN is no longer constant and is redefined to
173 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
174 sets for modern architectural features like Arm SVE.
176 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
177 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
178 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
179 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
180 dynamic sized register sets for modern architectural features like
183 * The dynamic linker implements the --list-diagnostics option, printing
184 a dump of information related to IFUNC resolver operation and
185 glibc-hwcaps subdirectory selection.
187 * On Linux, the function execveat has been added. It operates similar to
188 execve and it is is already used to implement fexecve without requiring
189 /proc to be mounted. However, different than fexecve, if the syscall is not
190 supported by the kernel an error is returned instead of trying a fallback.
192 * The ISO C2X function timespec_getres has been added.
194 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
195 C2X, is supported to enable declarations of functions defined in Annex F
196 of C2X. Those declarations are also enabled when
197 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
198 defined, and when _GNU_SOURCE is defined.
200 * On powerpc64*, glibc can now be compiled without scv support using the
201 --disable-scv configure option.
203 * Add support for 64-bit time_t on configurations like x86 where time_t
204 is traditionally 32-bit. Although time_t still defaults to 32-bit on
205 these configurations, this default may change in future versions.
206 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
207 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
208 only enabled for Linux and the full support requires a minimum kernel
211 * The main gconv-modules file in glibc now contains only a small set of
212 essential converter modules and the rest have been moved into a supplementary
213 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
214 in the same GCONV_PATH. Similarly, external converter modules directories
215 may have supplementary configuration files in a gconv-modules.d directory
216 with names ending with .conf to logically classify the converter modules in
219 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
220 to configure the size of the thread stack cache.
222 * The function _Fork has been added as an async-signal-safe fork replacement
223 since Austin Group issue 62 droped the async-signal-safe requirement for
224 fork (and it will be included in the future POSIX standard). The new _Fork
225 function does not run any atfork function neither resets any internal state
226 or lock (such as the malloc one), and only sets up a minimal state required
227 to call async-signal-safe functions (such as raise or execve). This function
228 is currently a GNU extension.
230 * On Linux, the close_range function has been added. It allows efficiently
231 closing a range of file descriptors on recent kernels (version 5.9).
233 * The function closefrom has been added. It closes all file descriptors
234 greater than or equal to a given integer. This function is a GNU extension,
235 although it is also present in other systems.
237 * The posix_spawn_file_actions_addclosefrom_np function has been added,
238 enabling posix_spawn and posix_spawnp to close all file descriptors greater
239 than or equal to a given integer. This function is a GNU extension,
240 although Solaris also provides a similar function.
242 * When invoked explicitly, the dynamic linker now uses the kernel to
243 execute programs that do not have any dynamic dependency (that is,
244 they are statically linked). This feature is Linux-specific.
246 * The audit libraries will avoid unnecessary slowdown if it is not required
247 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
249 Deprecated and removed features, and other changes affecting compatibility:
251 * The function pthread_mutex_consistent_np has been deprecated; programs
252 should use the equivalent standard function pthread_mutex_consistent
255 * The function pthread_mutexattr_getrobust_np has been deprecated;
256 programs should use the equivalent standard function
257 pthread_mutexattr_getrobust instead.
259 * The function pthread_mutexattr_setrobust_np has been deprecated;
260 programs should use the equivalent standard function
261 pthread_mutexattr_setrobust instead.
263 * The function pthread_yield has been deprecated; programs should use
264 the equivalent standard function sched_yield instead.
266 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
268 * Various rarely-used functions declared in <resolv.h> and
269 <arpa/nameser.h> have been deprecated. Applications are encouraged to
270 use dedicated DNS processing libraries if applicable. For <resolv.h>,
271 this affects the functions dn_count_labels, fp_nquery, fp_query,
272 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
273 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
274 p_type, putlong, putshort, res_hostalias, res_isourserver,
275 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
276 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
277 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
278 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
280 * Various symbols previously defined in libresolv have been moved to libc
281 in order to prepare for libresolv moving entirely into libc (see earlier
282 entry for merging libraries into libc). The symbols __dn_comp,
283 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
284 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
285 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
286 __res_search, __res_send formerly in libresolv have been renamed and no
287 longer have a __ prefix. They are now available in libc.
289 * The pthread cancellation handler is now installed with SA_RESTART and
290 pthread_cancel will always send the internal SIGCANCEL on a cancellation
291 request. It should not be visible to applications since the cancellation
292 handler should either act upon cancellation (if asynchronous cancellation
293 is enabled) or ignore the cancellation internal signal. However there are
294 buggy kernel interfaces (for instance some CIFS versions) that could still
295 see a spurious EINTR error when cancellation interrupts a blocking syscall.
297 * Previously, glibc installed its various shared objects under versioned
298 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
299 were provided as symbolic links. Starting with glibc 2.34, the shared
300 objects are installed under their ABI sonames directly, without
301 symbolic links. This increases compatibility with distribution
302 package managers that delete removed files late during the package
303 upgrade or downgrade process.
305 * The symbols mallwatch and tr_break are now deprecated and no longer used in
306 mtrace. Similar functionality can be achieved by using conditional
307 breakpoints within mtrace functions from within gdb.
309 * The __morecore and __after_morecore_hook malloc hooks and the default
310 implementation __default_morecore have been removed from the API. Existing
311 applications will continue to link against these symbols but the interfaces
312 no longer have any effect on malloc.
314 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
315 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
316 disabled by default in the main C library. Users looking to use these
317 features now need to preload a new debugging DSO libc_malloc_debug.so to get
318 this functionality back.
320 * The deprecated functions malloc_get_state and malloc_set_state have been
321 moved from the core C library into libc_malloc_debug.so. Legacy applications
322 that still use these functions will now need to preload libc_malloc_debug.so
323 in their environment using the LD_PRELOAD environment variable.
325 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
326 __memalign_hook and __free_hook are now removed from the API. Compatibility
327 symbols are present to support legacy programs but new applications can no
328 longer link to these symbols. These hooks no longer have any effect on glibc
329 functionality. The malloc debugging DSO libc_malloc_debug.so currently
330 supports hooks and can be preloaded to get this functionality back for older
331 programs. However this is a transitional measure and may be removed in a
332 future release of the GNU C Library. Users may port away from these hooks by
333 writing and preloading their own malloc interposition library.
335 Changes to build and runtime requirements:
337 * On Linux, the shm_open, sem_open, and related functions now expect the
338 file shared memory file system to be mounted at /dev/shm. These functions
339 no longer search among the system's mount points for a suitable
340 replacement if /dev/shm is not available.
342 Security related changes:
344 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
345 a request for netgroup lookup, may crash due to a double-free,
346 potentially resulting in degraded service or Denial of Service on the
347 local system. Reported by Chris Schanzle.
349 CVE-2021-33574: The mq_notify function has a potential use-after-free
350 issue when using a notification type of SIGEV_THREAD and a thread
351 attribute with a non-default affinity mask.
353 CVE-2021-35942: The wordexp function may overflow the positional
354 parameter number when processing the expansion resulting in a crash.
355 Reported by Philippe Antoine.
357 The following bugs are resolved with this release:
359 [4737] libc: fork is not async-signal-safe
360 [5781] math: Slow dbl-64 sin/cos/sincos for special values
361 [10353] libc: Methods for deleting all file descriptors greater than
362 given integer (closefrom)
363 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
364 name containing multi-byte character(s)
365 [14469] math: Inaccurate j0f function
366 [14470] math: Inaccurate j1f function
367 [14471] math: Inaccurate y0f function
368 [14472] math: Inaccurate y1f function
369 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
371 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
372 crashes if it fails dlsym() twice
373 [15648] nptl: multiple definition of `__lll_lock_wait_private'
374 [16063] nptl: Provide a pthread_once variant in libc directly
375 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
376 [17145] libc: syslog with LOG_CONS leaks console file descriptor
377 [17183] manual: description of ENTRY struct in <search.h> in glibc
379 [18435] nptl: pthread_once hangs when init routine throws an exception
380 [18524] nptl: Missing calloc error checking in
381 __cxa_thread_atexit_impl
382 [19329] dynamic-link: dl-tls.c assert failure at concurrent
383 pthread_create and dlopen
384 [19366] nptl: returning from a thread should disable cancellation
385 [19511] nptl: 8MB memory leak in pthread_create in case of failure
386 when non-root user changes priority
387 [20802] dynamic-link: getauxval NULL pointer dereference after static
389 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
390 [22057] malloc: malloc_usable_size is broken with mcheck
391 [22668] locale: LC_COLLATE: the last character of ellipsis is not
393 [23323] libc: [RFE] CSU startup hardening.
394 [23328] malloc: Remove malloc hooks and ensure related APIs return no
396 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
397 $PLATFORM, $ORIGIN) crashes
398 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
399 [23554] nptl: pthread_getattr_np reports wrong stack size with
401 [24106] libc: Bash interpreter in ldd script is taken from host
402 [24773] dynamic-link: dlerror in an secondary namespace does not use
403 the right free implementation
404 [25036] localedata: Update collation order for Swedish
405 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
406 shm_open to pick wrong directory
407 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
408 crash in IFUNC resolver due to stack canary (--enable-stack-
410 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
411 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
412 [27111] dynamic-link: pthread_create and tls access use link_map
413 objects that may be concurrently freed by dlclose
414 [27132] malloc: memusagestat is linked to system librt, leading to
415 undefined symbols on major version upgrade
416 [27136] dynamic-link: dtv setup at thread creation may leave an entry
418 [27249] libc: libSegFault.so does not output signal number properly
419 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
421 [27318] dynamic-link: glibc fails to load binaries when built with
422 -march=sandybridge: CPU ISA level is lower than required
423 [27343] nss: initgroups() SIGSEGVs when called on a system without
424 nsswich.conf (in a chroot)
425 [27346] dynamic-link: x86: PTWRITE feature check is missing
426 [27389] network: NSS chroot hardening causes regressions in chroot
428 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
429 [27444] libc: sysconf reports unsupported option (-1) for
430 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
431 [27462] nscd: double-free in nscd (CVE-2021-27645)
432 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
433 malloc/tst-malloc-thread-fail
434 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
435 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
437 [27522] glob: glob, glob64 incorrectly marked as __THROW
438 [27555] dynamic-link: Static tests fail with --enable-stack-
440 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
441 information for the current directory
442 [27577] dynamic-link: elf/ld.so --help doesn't work
443 [27605] libc: tunables can't control xsave/xsavec selection in
445 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
446 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
448 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
449 _nss_files_getcanonname_r) from within a dlmopen namespace.
450 [27648] libc: FAIL: misc/tst-select
451 [27650] stdio: vfscanf returns too early if a match is longer than
453 [27651] libc: Performance regression after updating to 2.33
454 [27655] string: Wrong size calculation in string/test-strnlen.c
455 [27706] libc: select fails to update timeout on error
456 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
457 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
458 tries resolving them lazily
459 [27744] nptl: Support different libpthread/ld.so load orders in
461 [27749] libc: Data race __run_exit_handlers
462 [27761] libc: getconf: Segmentation fault when passing '-vq' as
464 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
465 exceeds maximum object size 2147483647
466 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
468 [27872] build: Obsolete configure option --enable-stackguard-
470 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
471 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
472 [27892] libc: powerpc: scv ABI error handling fails to check
474 [27896] nptl: mq_notify does not handle separately allocated thread
475 attributes (CVE-2021-33574)
476 [27901] libc: TEST_STACK_ALIGN doesn't work
477 [27902] libc: The x86-64 clone wrapper fails to align child stack
478 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
479 [27939] libc: aarch64: clone does not align the stack
480 [27968] libc: s390x: clone does not align the stack
481 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
482 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
484 [28028] malloc: malloc: tcache shutdown sequence does not work if the
485 thread never allocated anything
486 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
487 [28064] string: x86_64:wcslen implementation list has wcsnlen
488 [28067] libc: FAIL: posix/tst-spawn5
489 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
490 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
492 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
493 [28089] build: tst-tls20 fails when linker defaults to --as-needed
494 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
496 [28091] network: ns_name_skip may return 0 for domain names without
504 * The dynamic linker accepts the --list-tunables argument which prints
505 all the supported tunables. This option is disable if glibc is
506 configured with tunables disabled (--enable-tunables=no).
508 * The dynamic linker accepts the --argv0 argument and provides opportunity
509 to change argv[0] string.
511 * The dynamic linker loads optimized implementations of shared objects
512 from subdirectories under the glibc-hwcaps directory on the library
513 search path if the system's capabilities meet the requirements for
514 that subdirectory. Initially supported subdirectories include
515 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
516 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
517 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
518 subdirectory names correspond to the vendor-independent x86-64
519 microarchitecture levels defined in the x86-64 psABI supplement.
521 * The new --help option of the dynamic linker provides usage and
522 information and library search path diagnostics.
524 * The mallinfo2 function is added to report statistics as per mallinfo,
525 but with larger field widths to accurately report values that are
526 larger than fit in an integer.
528 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
530 * Support for the RISC-V ISA running on Linux has been expanded to run on
531 32-bit hardware. This is supported for the following ISA and ABI pairs:
537 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
540 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
541 glibc may use additional checks that may have an additional performance
542 overhead. At present these checks are available only on LLVM 9 and later.
543 The latest GCC available at this time (10.2) does not support this level of
546 Deprecated and removed features, and other changes affecting compatibility:
548 * The mallinfo function is marked deprecated. Callers should call
551 * When dlopen is used in statically linked programs, alternative library
552 implementations from HWCAP subdirectories are no longer loaded.
553 Instead, the default implementation is used.
555 * The deprecated <sys/vtimes.h> header and the function vtimes have been
556 removed. To support old binaries, the vtimes function continues to exist
557 as a compatibility symbol. Applications should use the getrlimit or
560 * Following a change in the tzdata 2018a release upstream, the zdump
561 program is now installed in the /usr/bin subdirectory. Previously,
562 the /usr/sbin subdirectory was used.
564 * On s390(x), the type float_t is now derived from the macro
565 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
566 hardcoded to double. This does not affect the ABI of any libraries
567 that are part of the GNU C Library, but may affect the ABI of other
568 libraries that use this type in their interfaces. The new definition
569 improves consistency with compiler behavior in many scenarios.
571 * A future version of glibc will stop loading shared objects from the
572 "tls" subdirectories on the library search path, the subdirectory that
573 corresponds to the AT_PLATFORM system name, and also stop employing
574 the legacy AT_HWCAP search mechanism. Applications should switch to
575 the new glibc-hwcaps mechanism instead; if they do not do that, only
576 the baseline version (directly from the search path directory) will be
579 Changes to build and runtime requirements:
581 * On Linux, the system administrator needs to configure /dev/pts with
582 the intended access modes for pseudo-terminals. glibc no longer
583 attemps to adjust permissions of terminal devices. The previous glibc
584 defaults ("tty" group, user read/write and group write) already
585 corresponded to what most systems used, so that grantpt did not
586 perform any adjustments.
588 * On Linux, the posix_openpt and getpt functions no longer attempt to
589 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
590 (and pseudo-terminals are supported), a devpts file system is mounted
591 on /dev/pts. Current systems already meet these requirements.
593 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
595 Security related changes:
597 CVE-2021-3326: An assertion failure during conversion from the
598 ISO-20220-JP-3 character set using the iconv function has been fixed.
599 This assertion was triggered by certain valid inputs in which the
600 converted output contains a combined sequence of two wide characters
601 crossing a buffer boundary. Reported by Tavis Ormandy.
603 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
604 invoked with input containing redundant shift sequences in the IBM1364,
605 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
607 CVE-2020-29562: An assertion failure has been fixed in the iconv function
608 when invoked with UCS4 input containing an invalid character.
610 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
611 invoked with EUC-KR input containing invalid multibyte input sequences.
613 The following bugs are resolved with this release:
615 [10635] libc: realpath portability patches
616 [16124] dynamic-link: ld.so should allow to change argv[0]
617 [17924] malloc: 'free' should not set errno
618 [18683] libc: Linux faccessat implementation can incorrectly ignore
620 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
621 [23091] hurd: missing waitid support
622 [23249] libc: Epyc and other current AMD CPUs do not select the
623 "haswell" platform subdirectory
624 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
626 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
628 [24941] libc: Make grantpt usable after multi-threaded fork in more
630 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
631 [24973] locale: iconv encounters segmentation fault when converting
632 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
633 [25399] string: undefined reference to `__warn_memset_zero_len' when
634 changing gnuc version
635 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
637 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
639 [25971] libc: s390 bits/hwcap.h out of sync with kernel
640 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
641 [26100] libc: Race in syslog(3) with regards to tag printing.
642 [26124] libc: Export <cpu-features.h>
643 [26130] nscd: Inconsistent nscd cache during pruning
644 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
645 [26224] locale: iconv hangs when converting some invalid inputs from
646 several IBM character sets (CVE-2020-27618)
647 [26341] libc: realpath cyclically call __alloca(path_max) to consume
649 [26343] manual: invalid documented return type for strerrorname_np(),
650 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
651 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
653 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
655 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
656 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
658 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
659 [26553] libc: mtx_init allows type set to "mtx_recursive" only
660 [26555] string: strerrorname_np does not return the documented value
661 [26592] libc: pointer arithmetic overflows in realpath
662 [26600] network: Transaction ID collisions cause slow DNS lookups in
664 [26606] libc: [2.33 Regression] pselect is broken on x32
665 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
666 [26620] glob: fnmatch with collating symbols results in segmentation
668 [26625] libc: [2.33 Regression] CET is disabled
669 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
670 at the end of a memory mapping
671 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
672 by the caller to the kernel
673 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
674 [26647] build: [-Werror=array-parameter=] due to different
675 declarations for __sigsetjmp
676 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
678 [26649] stdio: printf should handle non-normal x86 long double numbers
679 gracefully (CVE-2020-29573)
680 [26686] build: -Warray-parameter instances building with GCC 11
681 [26687] build: -Warray-bounds instances building with GCC 11
682 [26690] stdio: Aliasing violation in __vfscanf_internal
683 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
684 [26726] build: GCC warning calling new_composite_name with an array of
686 [26736] libc: FAIL: misc/tst-sysvshm-linux
687 [26737] libc: Random FAIL: rt/tst-shm
688 [26791] libc: Missing O_CLOEXEC in sysconf.c
689 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
691 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
693 [26818] string: aarch64: string tests may run ifunc variants that are
695 [26821] libc: Memory leak test failures on Fedora 33
696 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
697 FSGSBASE/LM/RDRAND check failure
698 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
700 [26853] libc: aarch64: Missing unwind information in statically linked
702 [26923] locale: Assertion failure in iconv when converting invalid
703 UCS4 (CVE-2020-29562)
704 [26926] dynamic-link: aarch64: library dependencies are not bti
706 [26932] libc: sh: Multiple floating point functions defined as stubs
708 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
710 [26988] dynamic-link: aarch64: BTI mprotect address is not page
712 [27002] build: libc_freeres_fn build failure with GCC 11
713 [27004] dynamic-link: ld.so is miscompiled by GCC 11
714 [27008] dynamic-link: ld.so.cache should have endianness markup
715 [27042] libc: [alpha] anonymous union in struct stat confuses
717 [27053] libc: Conformance regression in system(3) (and probably also
719 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
721 [27077] network: Do not reload /etc/nsswitch.conf from chroot
722 [27083] libc: Unsafe unbounded alloca in addmntent
723 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
725 [27130] string: "rep movsb" performance issue
726 [27150] libc: alpha: wait4() is unavailable in static linking
727 [27177] dynamic-link:
728 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
730 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
731 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
732 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
733 related to combining characters (CVE-2021-3326)
740 * Unicode 13.0.0 Support: Character encoding, character type info, and
741 transliteration tables are all updated to Unicode 13.0.0, using
742 generator scripts contributed by Mike FABIAN (Red Hat).
744 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
746 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
747 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
748 Three ABIs are supported:
754 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
755 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
757 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
758 DT_DEPAUDIT dynamic section entries of the main executable.
760 * powerpc64le supports IEEE128 long double libm/libc redirects when
761 using -mabi=ieeelongdouble to compile C code on supported GCC
762 toolchains. It is recommended to use GCC 8 or newer when testing
765 * To help detect buffer overflows and other out-of-bounds accesses
766 several APIs have been annotated with GCC 'access' attribute. This
767 should help GCC 10 issue better warnings.
769 * On Linux, functions pthread_attr_setsigmask_np and
770 pthread_attr_getsigmask_np have been added. They allow applications
771 to specify the signal mask of a thread created with pthread_create.
773 * The GNU C Library now provides the header file <sys/single_threaded.h>
774 which declares the variable __libc_single_threaded. Applications are
775 encouraged to use this variable for single-thread optimizations,
776 instead of weak references to symbols historically defined in
779 * The functions sigabbrev_np and sigdescr_np have been added. The
780 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
781 SIGHUP) while sigdescr_np returns a string describing the signal number
782 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
783 attempt to translate the return description, both functions return
784 NULL for an invalid signal number.
786 They should be used instead of sys_siglist or sys_sigabbrev and they
787 are both thread and async-signal safe. These functions are GNU extensions.
789 * The functions strerrorname_np and strerrordesc_np have been added. The
790 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
791 while strerrordesc_np returns a string describing the error number
792 (e.g "Invalid argument" for EINVAL). Different than strerror,
793 strerrordesc_np does not attempt to translate the return description, both
794 functions return NULL for an invalid error number.
796 They should be used instead of sys_errlist and sys_nerr, both are
797 thread and async-signal safe. These functions are GNU extensions.
799 * AArch64 now supports standard branch protection security hardening
800 in glibc when it is built with a GCC that is configured with
801 --enable-standard-branch-protection (or if -mbranch-protection=standard
802 flag is passed when building both GCC target libraries and glibc,
803 in either case a custom GCC is needed). This includes branch target
804 identification (BTI) and pointer authentication for return addresses
805 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
806 extensions respectively for the protection to be effective,
807 otherwise the used instructions are nops. User code can use PAC-RET
808 without libc support, but BTI requires a libc that is built with BTI
809 support, otherwise runtime objects linked into user code will not be
812 Deprecated and removed features, and other changes affecting compatibility:
814 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
815 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
816 RPC header files. Backward compatibility for old programs is kept
817 only for architectures and ABIs that have been added in or before
818 glibc 2.31. New programs need to use TI-RPC
819 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
820 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
822 * Remove configure option --enable-obsolete-nsl. libnsl is only built
823 as shared library for backward compatibility and the NSS modules "nis"
824 and "nisplus" are not built at all and libnsl's headers aren't
825 installed. This compatibility is kept only for architectures and ABIs
826 that have been added in or before version 2.28. Replacement
827 implementations based on TI-RPC, which additionally support IPv6, are
828 available from <https://github.com/thkukuk/>. This change does not
829 affect the "compat" NSS module, which does not depend on libnsl
830 since 2.27 and thus can be used without NIS.
832 * The deprecated <sys/sysctl.h> header and the sysctl function have been
833 removed. To support old binaries, the sysctl function continues to
834 exist as a compatibility symbol (on those architectures which had it),
835 but always fails with ENOSYS. This reflects the removal of the system
836 call from all architectures, starting with Linux 5.5.
838 * The sstk function is no longer available to newly linked binaries.
839 Its implementation always returned with a failure, and the function
840 was not declared in any header file.
842 * The legacy signal handling functions siginterrupt, sigpause, sighold,
843 sigrelse, sigignore and sigset, and the sigmask macro have been
844 deprecated. Applications should use the sigsuspend, sigprocmask and
845 sigaction functions instead.
847 * ldconfig now defaults to the new format for ld.so.cache. glibc has
848 already supported this format for almost 20 years.
850 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
851 are no longer available to newly linked binaries, and their declarations
852 have been removed from <string.h>. They are exported solely as
853 compatibility symbols to support old binaries. All programs should use
856 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
857 are no longer available to newly linked binaries, and their declarations
858 have been removed from <stdio.h>. They are exported solely as
859 compatibility symbols to support old binaries. All programs should use
860 strerror or strerror_r instead.
862 * Both strerror and strerror_l now share the same internal buffer in the
863 calling thread, meaning that the returned string pointer may be invalided
864 or contents might be overwritten on subsequent calls in the same thread or
865 if the thread is terminated. It makes strerror MT-safe.
867 * Using weak references to libpthread functions such as pthread_create
868 or pthread_key_create to detect the singled-threaded nature of a
869 program is an obsolescent feature. Future versions of glibc will
870 define pthread_create within libc.so.6 itself, so such checks will
871 always flag the program as multi-threaded. Applications should check
872 the __libc_single_threaded variable declared in
873 <sys/single_threaded.h> instead.
875 * The "files" NSS module no longer supports the "key" database (used for
876 secure RPC). The contents of the /etc/publickey file will be ignored,
877 regardless of the settings in /etc/nsswitch.conf. (This method of
878 storing RPC keys only supported the obsolete and insecure AUTH_DES
879 flavor of secure RPC.)
881 * The __morecore and __after_morecore_hook malloc hooks and the default
882 implementation __default_morecore have been deprecated. Applications
883 should use malloc interposition to change malloc behavior, and mmap to
884 allocate anonymous memory. A future version of glibc may require that
885 applications which use the malloc hooks must preload a special shared
886 object, to enable the hooks.
888 * The hesiod NSS module has been deprecated and will be removed in a
889 future version of glibc. System administrators are encouraged to
890 switch to other approaches for networked account databases, such as
893 Changes to build and runtime requirements:
895 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
896 long double redirects.
898 Security related changes:
900 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
901 invoked with the -c option and when processing invalid multi-byte input
902 sequences. Reported by Jan Engelhardt.
904 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
905 corruption when they were passed a pseudo-zero argument. Reported by Guido
906 Vranken / ForAllSecure Mayhem.
908 CVE-2020-1752: A use-after-free vulnerability in the glob function when
909 expanding ~user has been fixed.
911 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
912 memmove functions has been fixed. Discovered by Jason Royes and Samual
913 Dytrych of the Cisco Security Assessment and Penetration Team (See
916 The following bugs are resolved with this release:
918 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
919 [10441] manual: Backtraces code example lacks error checking
920 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
921 timer_sigev_thread dangerous
922 [14231] stdio: stdio-common tests memory requirements
923 [14578] libc: /proc-based emulation for lchmod, fchmodat
924 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
925 filtee has constructor
926 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
927 sequences (CVE-2016-10228)
928 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
929 character entities for infinity & pi
930 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
931 segfaults in applications
932 [20543] libc: Please move from .gnu.linkonce to comdat
933 [22489] network: gcc warns about implicit convertion in
934 ICMP6_FILTER_SETPASS with -Wsign-conversion
935 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
936 [23294] math: Complex _FloatN functions are redirected to the wrong
937 function with -mlong-double-64
938 [23296] libc: Data race in setting function descriptor during lazy
940 [23668] dynamic-link: ldconfig: Default to the new format for
942 [23819] hurd: hurd: Add C11 thread support
943 [23990] build: test-container error out on failure to exec child.
944 [23991] build: shell-container typo in run_command_array
945 [24638] manual: Error in example of parsing a template string
946 [24654] manual: Wrong declaration of wcschr in libc manual
947 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
949 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
950 dynamically loaded dsos
951 [25098] nptl: nptl: ctype classification functions are not AS-Safe
952 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
954 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
955 restore EAX, ECX and EDX
956 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
957 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
958 [25420] network: Race condition in resolv_conf.c can result in caching
959 stale configuration forever
960 [25487] math: sinl() stack corruption from crafted input
962 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
964 [25523] libc: MIPS/Linux inline syscall template is miscompiled
965 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
967 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
968 on 32 bit and old kernel
969 [25635] libc: arm: Wrong sysdep order selection for soft-fp
970 [25639] localedata: Some names of days and months wrongly spelt in
972 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
973 amount of sigset_t bytes
974 [25691] stdio: printf: memory leak when printing long multibyte
976 [25715] libc: system() returns wrong errors when posix_spawn fails
977 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
978 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
979 state for conversions that produce two Unicode code points
980 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
981 for linux x86_64 leads to livelock
982 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
983 test failures, invalid instruction in ld.so
984 [25790] glob: Typo in tst-fnmatch.input
985 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
987 [25819] localedata: Update locale data to Unicode 13.0.0
988 [25824] libc: Abnormal function of strnlen in aarch64
989 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
990 [25896] libc: Incorrect prctl
991 [25902] libc: Bad LOADARGS_N
992 [25905] dynamic-link: VSX registers are corrupted during PLT
993 resolution when glibc is built with --disable-multi-arch and --with-
995 [25933] string: Off by one error in __strncmp_avx2 when
996 length=VEC_SIZE*4 and strings are at page boundaries can cause a
998 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
999 exiting detached thread
1000 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1002 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1004 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1005 [26073] math: getpayload() has wrong return value
1006 [26076] dynamic-link: dlmopen crashes after failing to load
1007 dependencies in audit mode
1008 [26120] localedata: column width of of some Korean
1009 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1010 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1011 [26133] libc: Incorrect need_arch_feature_F16C
1012 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1014 [26149] libc: PKU is usable only if OSPKE is set
1015 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1017 [26208] libc: Incorrect bit_cpu_CLFSH
1018 [26210] network: Incorrect use of hidden symbols for global sunrpc
1020 [26211] stdio: printf integer overflow calculating allocation size
1021 [26214] stdio: printf_fp double free
1022 [26215] stdio: printf_fp memory leak
1023 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1024 [26258] nss: nss_compat should not read input files with mmap
1025 [26332] string: Incorrect cache line size load causes memory
1026 corruption in memset
1033 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1034 enable features from the draft ISO C2X standard. Only some features from
1035 this draft standard are supported by the GNU C Library, and as the draft
1036 is under active development, the set of features enabled by this macro is
1037 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1038 by compiling with "gcc -std=gnu2x".
1040 * The <math.h> functions that round their results to a narrower type now
1041 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1042 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1043 Clarification Request 13 to TS 18661-3.
1045 * The function pthread_clockjoin_np has been added, enabling join with a
1046 terminated thread with a specific clock. It allows waiting against
1047 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1049 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1051 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1052 in queries if the trust-ad option is set via the options directive in
1053 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1054 mode, the AD bit, as provided by the name server, is available to
1055 applications which call res_search and related functions. In the default
1056 mode, the AD bit is not set in queries, and it is automatically cleared in
1057 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1058 servers and the network path to them are treated as untrusted.)
1060 Deprecated and removed features, and other changes affecting compatibility:
1062 * The totalorder and totalordermag functions, and the corresponding
1063 functions for other floating-point types, now take pointer arguments to
1064 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1065 passing. This is in accordance with the resolution of Clarification
1066 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1067 floating-point arguments directly will continue to work.
1069 * The obsolete function stime is no longer available to newly linked
1070 binaries, and its declaration has been removed from <time.h>.
1071 Programs that set the system time should use clock_settime instead.
1073 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1074 in a future version of glibc. In this release, the header still exists
1075 but calling ftime will cause a compiler warning. All programs should use
1076 gettimeofday or clock_gettime instead.
1078 * The gettimeofday function no longer reports information about a
1079 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1080 many years, as it cannot handle the full complexity of the world's
1081 timezones, but hitherto we have supported it on a best-effort basis.
1082 Changes required to support 64-bit time_t on 32-bit architectures have
1083 made this no longer practical.
1085 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1086 should expect to receive a 'struct timezone' whose tz_minuteswest and
1087 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1088 happen on a few Linux-based ports. This will be corrected in a future
1091 All callers should supply a null pointer for the 'tzp' argument to
1092 gettimeofday. For accurate information about the time zone associated
1093 with the current time, use the localtime function.
1095 gettimeofday itself is obsolescent according to POSIX. We have no plans
1096 to remove access to this function, but portable programs should consider
1097 using clock_gettime instead.
1099 * The settimeofday function can still be used to set a system-wide time
1100 zone when the operating system supports it. This is because the Linux
1101 kernel reused the API, on some architectures, to describe a system-wide
1102 time-zone-like offset between the software clock maintained by the kernel,
1103 and the "RTC" clock that keeps time when the system is shut down.
1105 However, to reduce the odds of this offset being set by accident,
1106 settimeofday can no longer be used to set the time and the offset
1107 simultaneously. If both of its two arguments are non-null, the call
1108 will fail (setting errno to EINVAL).
1110 Callers attempting to set this offset should also be prepared for the call
1111 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1112 some Linux architectures. The Linux kernel maintainers are discussing a
1113 more principled replacement for the reused API. After a replacement
1114 becomes available, we will change settimeofday to fail with ENOSYS on all
1115 platforms when its 'tzp' argument is not a null pointer.
1117 settimeofday itself is obsolescent according to POSIX. Programs that set
1118 the system time should use clock_settime and/or the adjtime family of
1119 functions instead. We may cease to make settimeofday available to newly
1120 linked binaries after there is a replacement for Linux's time-zone-like
1123 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1124 the optional CAS instruction is implemented (for instance, LEON processors
1125 are still supported, but SuperSPARC processors are not).
1127 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1130 * If a lazy binding failure happens during dlopen, during the execution of
1131 an ELF constructor, the process is now terminated. Previously, the
1132 dynamic loader would return NULL from dlopen, with the lazy binding error
1133 captured in a dlerror message. In general, this is unsafe because
1134 resetting the stack in an arbitrary function call is not possible.
1136 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1137 executable stack unless explicitly configured at build time to require
1138 minimum kernel version 4.8 or newer. This is because executing
1139 floating-point branches on a non-executable stack on Linux kernels prior to
1140 4.8 can lead to application crashes for some MIPS configurations. While
1141 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1142 expected to enable non-executable stack by default with PT_GNU_STACK by
1143 default and is thus likely to trigger a crash on older kernels.
1145 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1146 non-executable stack while dropping support for older kernels.
1148 * System call wrappers for time system calls now use the new time64 system
1149 calls when available. On 32-bit targets, these wrappers attempt to call
1150 the new system calls first and fall back to the older 32-bit time system
1151 calls if they are not present. This may cause issues in environments
1152 that cannot handle unsupported system calls gracefully by returning
1153 -ENOSYS. Seccomp sandboxes are affected by this issue.
1155 Changes to build and runtime requirements:
1157 * It is no longer necessary to have recent Linux kernel headers to build
1158 working (non-stub) system call wrappers on all architectures except 64-bit
1159 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1161 * The ChangeLog file is no longer present in the toplevel directory of the
1162 source tree. ChangeLog files are located in the ChangeLog.old directory as
1163 ChangeLog.N where the highest N has the latest entries.
1165 Security related changes:
1167 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1168 out-of-bounds write when executed in a signal frame context.
1170 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1171 environment variable during program execution after a security
1172 transition, allowing local attackers to restrict the possible mapping
1173 addresses for loaded libraries and thus bypass ASLR for a setuid
1174 program. Reported by Marcin Kościelnicki.
1176 The following bugs are resolved with this release:
1178 [12031] localedata: iconv -t ascii//translit with Greek characters
1179 [15813] libc: Multiple issues in __gen_tempname
1180 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1181 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1182 [19767] libc: vdso is not used with static linking
1183 [19903] hurd: Shared mappings not being inherited by children processes
1184 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1185 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1187 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1188 Symbols-A/B Unicode blocks
1189 [23518] libc: Eliminate __libc_utmp_jump_table
1190 [24026] malloc: malloc_info() returns wrong numbers
1191 [24054] localedata: Many locales are missing date_fmt
1192 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1193 [24304] dynamic-link: Lazy binding failure during ELF
1194 constructors/destructors is not fatal
1195 [24376] libc: RISC-V symbol size confusion with _start
1196 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1198 [24824] libc: test-in-container does not install charmap files compatible
1200 [24844] regex: regex bad pointer / leakage if malloc fails
1201 [24867] malloc: Unintended malloc_info formatting changes
1202 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1203 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1204 [24882] libc: login: pututline uses potentially outdated cache
1205 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1206 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1208 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1210 [24930] dynamic-link: dlopen of PIE executable can result in
1211 _dl_allocate_tls_init assertion failure
1212 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1213 (stringop-overflow error)
1214 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1215 functions other can lead to crashes
1216 [24967] libc: jemalloc static linking causes runtime failure
1217 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1219 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1220 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1221 [25097] libc: new -Warray-bounds with GCC 10
1222 [25112] dynamic-link: dlopen must not make new objects accessible when it
1223 still can fail with an error
1224 [25139] localedata: Please add the new mnw_MM locale
1225 [25149] regex: Array bounds violation in proceed_next_node
1226 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1227 initialized correctly
1228 [25189] libc: glibc's __glibc_has_include causes issues with clang
1230 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1231 value to an unsigned
1232 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1233 binaries (CVE-2019-19126)
1234 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1236 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1238 [25232] string: <string.h> does not enable const correctness for strchr et
1240 [25233] localedata: Consider "." as the thousands separator for sl_SI
1242 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1243 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1244 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1246 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1247 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1249 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1250 (dl_initfirst) link map pointer
1251 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1252 [25423] libc: Array overflow in backtrace on powerpc
1253 [25425] network: Missing call to __resolv_context_put in
1254 getaddrinfo.c:gethosts
1261 * Unicode 12.1.0 Support: Character encoding, character type info, and
1262 transliteration tables are all updated to Unicode 12.1.0, using
1263 generator scripts contributed by Mike FABIAN (Red Hat).
1265 * The dynamic linker accepts the --preload argument to preload shared
1266 objects, in addition to the LD_PRELOAD environment variable.
1268 * The twalk_r function has been added. It is similar to the existing
1269 twalk function, but it passes an additional caller-supplied argument
1270 to the callback function.
1272 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1274 * Minguo (Republic of China) calendar support has been added as an
1275 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1278 * The entry for the new Japanese era has been added for ja_JP locale.
1280 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1281 pvalloc, memalign, and posix_memalign fail now with total object size
1282 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1283 pointer subtraction within the allocated object, where results might
1284 overflow the ptrdiff_t type.
1286 * The dynamic linker no longer refuses to load objects which reference
1287 versioned symbols whose implementation has moved to a different soname
1288 since the object has been linked. The old error message, symbol
1289 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1290 link time reference, is gone.
1292 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1293 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1294 functions. These behave similarly to their "timed" equivalents, but also
1295 accept a clockid_t parameter to determine which clock their timeout should
1296 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1297 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1298 time of the wait (unlike with pthread_condattr_setclock, which requires
1299 the clock choice at initialization time).
1301 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1302 work, new resolvers can use a second argument which can be extended in
1303 the future, currently it contains the AT_HWCAP2 value.
1305 Deprecated and removed features, and other changes affecting compatibility:
1307 * The copy_file_range function fails with ENOSYS if the kernel does not
1308 support the system call of the same name. Previously, user space
1309 emulation was performed, but its behavior did not match the kernel
1310 behavior, which was deemed too confusing. Applications which use the
1311 copy_file_range function can no longer rely on glibc to provide a fallback
1312 on kernels that do not support the copy_file_range system call, and if
1313 this function returns ENOSYS, they will need to use their own fallback.
1314 Support for copy_file_range for most architectures was added in version
1315 4.5 of the mainline Linux kernel.
1317 * The functions clock_gettime, clock_getres, clock_settime,
1318 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1319 for new applications (on architectures which had them). Instead, the
1320 definitions in libc will be used automatically, which have been available
1323 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1324 and <sys/stropts.h> have been removed.
1326 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1327 resolver flag (deprecated in glibc 2.25) have been removed.
1329 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1330 resolver have been removed from <resolv.h>.
1332 * With --enable-bind-now, installed programs are now linked with the
1335 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1336 configurations) has been removed, following the deprecation of this
1337 subarchitecture in version 8 of GCC, and its removal in version 9.
1339 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1340 header have been removed.
1342 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1343 deprecated and will be removed from a future version of glibc.
1344 Application should directly access /proc instead. For obtaining random
1345 bits, the getentropy function can be used.
1347 Changes to build and runtime requirements:
1349 * GCC 6.2 or later is required to build the GNU C Library.
1351 Older GCC versions and non-GNU compilers are still supported when
1352 compiling programs that use the GNU C Library.
1354 Security related changes:
1356 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1357 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1358 has undefined behavior. On x32, the size_t argument may be passed
1359 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1360 32 bits. When it happened with the sign bit of RDX register set,
1361 memcmp gave the wrong result since it treated the size argument as
1362 zero. Reported by H.J. Lu.
1364 CVE-2019-9169: Attempted case-insensitive regular-expression match
1365 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1366 over-read. Reported by Hongxu Chen.
1368 The following bugs are resolved with this release:
1370 [2872] locale: Transliteration Cyrillic -> ASCII fails
1371 [6399] libc: gettid() should have a wrapper
1372 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1373 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1374 [17396] localedata: globbing for locale by [[.collating-element.]]
1375 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1376 [18465] malloc: memusagestat is built using system C library
1377 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1378 invalid input drops valid char
1379 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1380 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1381 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1382 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1383 [23352] malloc: __malloc_check_init still defined in public header
1385 [23403] nptl: Wrong alignment of TLS variables
1386 [23501] libc: nftw() doesn't return dangling symlink's inode
1387 [23733] malloc: Check the count before calling tcache_get()
1388 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1390 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1391 [23844] nptl: pthread_rwlock_trywrlock results in hang
1392 [23983] argparse: Missing compat versions of argp_failure and argp_error
1393 for long double = double
1394 [23984] libc: Missing compat versions of err.h and error.h functions for
1395 long double = double
1396 [23996] localedata: Dutch salutations
1397 [24040] libc: riscv64: unterminated call chain in __thread_start
1398 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1400 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1401 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1403 [24114] regex: regexec buffer read overrun in "grep -i
1404 '\(\(\)*.\)*\(\)\(\)\1'"
1405 [24122] libc: Segfaults if 0 returned from la_version
1406 [24153] stdio: Some input functions do not react to stdin assignment
1407 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1408 RDX is set) (CVE-2019-7309)
1409 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1410 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1411 not the default "nor"
1412 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1413 false positives, change to modern flexible array
1414 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1415 instructions while maintaining the robust mutex list due to missing
1417 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1418 unnecessary librt dependencies
1419 [24200] localedata: Revert first_weekday removal in en_IE locale
1420 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1421 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1422 [24216] malloc: Check for large bin list corruption when inserting
1424 [24228] stdio: old x86 applications that use legacy libio crash on exit
1425 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1427 [24293] localedata: Missing Minguo calendar support for TW locales
1428 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1429 tt_RU (Tatar) locale
1430 [24307] localedata: Update locale data to Unicode 12.0.0
1431 [24323] dynamic-link: dlopen should not be able open PIE objects
1432 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1433 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1434 tt_RU (Tatar) locale
1435 [24370] localedata: Add lang_name for tt_RU locale
1436 [24372] locale: Binary locale files are not architecture independent
1437 [24394] time: strptime %Ey mis-parses final year of era
1438 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1440 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1442 [24531] malloc: Malloc tunables give tcache assertion failures
1443 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1445 [24535] localedata: Update locale data to Unicode 12.1.0
1446 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1447 kernels and break testing
1448 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1449 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1450 [-Werror=format-overflow=]
1451 [24570] libc: alpha: compat msgctl uses __IPC_64
1452 [24584] locale: Data race in __wcsmbs_clone_conv
1453 [24588] stdio: Remove codecvt vtables from libio
1454 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1456 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1457 [24632] stdio: Old binaries which use freopen with default stdio handles
1459 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1461 [24652] localedata: szl_PL spelling correction
1462 [24695] nss: nss_db: calling getpwent after endpwent crashes
1463 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1464 in /etc/nsswitch.conf
1465 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1466 [24740] libc: getdents64 type confusion
1467 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1468 always implemented in the same library
1469 [24744] libc: Remove copy_file_range emulation
1470 [24757] malloc: memusagestat is linked against system libpthread
1471 [24794] libc: Partial test suite run builds corrupt test-in-container
1479 * The getcpu wrapper function has been added, which returns the currently
1480 used CPU and NUMA node. This function is Linux-specific.
1482 * A new convenience target has been added for distribution maintainers
1483 to build and install all locales as directories with files. The new
1484 target is run by issuing the following command in your build tree:
1485 'make localedata/install-locale-files', with an optional DESTDIR
1486 to set the install root if you wish to install into a non-default
1487 configured location.
1489 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1491 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1492 for _GNU_SOURCE, to match BSD environments.
1494 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1495 indicates that it will abort the transaction prior to entering the kernel
1496 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1497 suspended, and this caused some undefined side-effects issues by aborting
1498 transactions manually. Glibc avoided it by abort transactions manually on
1499 each syscall, but it lead to performance issues on newer kernels where the
1500 HTM state is saved and restore lazily (the state being saved even when the
1501 process actually does not use HTM).
1503 * The functions posix_spawn_file_actions_addchdir_np and
1504 posix_spawn_file_actions_addfchdir_np have been added, enabling
1505 posix_spawn and posix_spawnp to run the new process in a different
1506 directory. These functions are GNU extensions. The function
1507 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1510 * The popen and system do not run atfork handlers anymore (BZ#17490).
1511 Although it is a possible POSIX violation, the POSIX rationale in
1512 pthread_atfork documentation regarding atfork handlers is to handle
1513 inconsistent mutex state after a fork call in a multi-threaded process.
1514 In both popen and system there is no direct access to user-defined mutexes.
1516 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1517 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1519 - C-SKY ABIV2 soft-float little-endian
1520 - C-SKY ABIV2 hard-float little-endian
1522 * strftime's default formatting of a locale's alternative year (%Ey)
1523 has been changed to zero-pad the year to a minimum of two digits,
1524 like "%y". This improves the display of Japanese era years during
1525 the first nine years of a new era, and is expected to be harmless
1526 for all other locales (only Japanese locales regularly have
1527 alternative year numbers less than 10). Zero-padding can be
1528 overridden with the '_' or '-' flags (which are GNU extensions).
1530 * As a GNU extension, the '_' and '-' flags can now be applied to
1531 "%EY" to control how the year number is formatted; they have the
1532 same effect that they would on "%Ey".
1534 Deprecated and removed features, and other changes affecting compatibility:
1536 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1537 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1539 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1540 in <sys/procfs.h>, has been corrected to match the type actually used by
1541 the Linux kernel. This affects the size and layout of that structure on
1542 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1544 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1545 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1546 defined in <sys/procfs.h>, has been corrected to match the type actually
1547 used by the Linux kernel. This affects the size and layout of those
1550 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1551 meant to scan a string and allocate space for it with malloc, is now
1552 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1553 defined. This extension conflicts with C99's use of '%a' to scan a
1554 hexadecimal floating-point number, which is now available to programs
1555 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1557 POSIX.1-2008 includes the feature of allocating a buffer for string input
1558 with malloc, using the modifier letter 'm' instead. Programs using
1559 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1560 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1561 C99 '%a' no longer need to avoid _GNU_SOURCE.
1563 GCC's -Wformat warnings can detect most uses of this extension, as long
1564 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1565 __attribute__ ((format (scanf, ...))).
1567 Changes to build and runtime requirements:
1569 * Python 3.4 or later is required to build the GNU C Library.
1571 * On most architectures, GCC 5 or later is required to build the GNU C
1572 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1574 Older GCC versions and non-GNU compilers are still supported when
1575 compiling programs that use the GNU C Library.
1577 Security related changes:
1579 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1580 denial of service due to resource exhaustion when processing getaddrinfo
1581 calls with crafted host names. Reported by Guido Vranken.
1583 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1584 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1585 happened, accessing the 32-bit size_t value as the full 64-bit register
1586 in the assembly string/memory functions would cause a buffer overflow.
1587 Reported by H.J. Lu.
1589 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1590 addresses with arbitrary trailing characters, potentially leading to data
1591 or command injection issues in applications.
1593 The following bugs are resolved with this release:
1595 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1596 [10496] localedata: 12h time representation in multiple locales faulty
1597 [10797] localedata: it_IT locale numeric does not have a separator for
1599 [11319] libc: dprintf doesn't handle errors properly
1600 [16346] time: mktime: potentially unsafe use of localtime_offset
1601 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1603 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1604 posix_spawn_file_actions_addfchdir_np
1605 [17426] localedata: Indian locales: set the correct date format
1606 [17490] stdio: popen should not invoke atfork handlers
1607 [17783] libc: TIOCSER_TEMT conditions inconsistent
1608 [18040] regex: use-after-free in regexec/get_subexp
1609 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1610 [20018] network: getaddrinfo should reject IP addresses with trailing
1611 characters (CVE-2016-10739)
1612 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1613 [20271] libc: Missing "\n" in __libc_fatal calls
1614 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1615 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1616 pointer argument is non-NULL
1617 [21037] stdio: open_memstream and freopen
1618 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1619 [21716] time: Crash in glibc's mktime in low-memory situations
1620 [22834] stdio: Subprocess forked by popen may crash in Linux when
1621 multithreads call popen
1622 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1623 and pthread_create fails.
1624 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1625 [23125] libc: riscv64: endless loop when throwing an exception from a
1627 [23275] nptl: Race in pthread_mutex_lock while promoting to
1628 PTHREAD_MUTEX_ELISION_NP.
1629 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1631 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1633 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1635 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1636 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1638 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1639 [23521] nss: get_next_alias nss_files file stream leak
1640 [23538] nptl: Hang in pthread_cond_broadcast
1641 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1642 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1643 [23579] libc: Errors misreported in preadv2
1644 [23597] build: support/test-container.c doesn't work with different
1646 [23603] time: mktime signed integer overflow on large timestamps
1647 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1648 [23614] libc: powerpc: missing CFI register information in __mpn_*
1650 [23637] string: Generic strstr/strcasestr fails with huge needles
1651 [23640] libc: no way to easily clear FD_CLOEXEC in
1652 posix_spawn_file_actions_adddup2()
1653 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1655 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1657 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1658 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1659 bits/types/struct_rusage.h
1660 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1662 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1664 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1665 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1666 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1668 [23724] localedata: Albanian date formats are incorrect
1669 [23735] math: libnldbl_nonshared.a references internal libm symbols
1670 [23740] localedata: kl_GL: Month names and date formats need update
1671 [23744] regex: regex refactorings to remove BE, avoid duplication
1672 [23745] time: mktime fix for Gnulib + coreutils
1673 [23758] time: Improve the width of alternate representation for year in
1675 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1676 [23789] time: mktime does not set errno on failure
1677 [23791] localedata: Wrong monetary format for ca_ES locale
1678 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1679 [23794] locale: c16rtomb does not handle surrogate pairs
1680 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1681 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1682 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1683 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1684 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1685 [23862] libc: [sh] missing kernel-features.h undefines
1686 [23864] libc: [riscv] missing kernel-features.h undefines
1687 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1688 [23907] malloc: Incorrect double-free malloc tcache check disregards
1690 [23913] libc: off-by-one in function maybe_script_execute in
1691 sysdeps/posix/spawni.c
1692 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1693 [23923] locale: Add --no-hard-links option to localedef
1694 [23927] network: Linux if_nametoindex() does not close descriptor
1696 [23961] math: powf can overflow to inf without setting errno in non-
1697 nearest rounding mode
1698 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1699 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1700 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1701 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1702 [24011] localedata: Fixed small type in comment for locale bs_BA
1703 [24018] libc: gettext() may return NULL
1704 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1705 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1706 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1708 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1709 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1711 [24046] localedata: en_US locale doesn't define date_fmt
1712 [24063] manual: @var{errno} should be @code{errno}
1713 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1714 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1716 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1718 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1720 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1722 [24112] network: Do not send DNS queries for non-host names (where all
1723 answers will be rejected)
1724 [24130] libc: alpha __remqu corrupts $f3 register
1731 * The localization data for ISO 14651 is updated to match the 2016
1732 Edition 4 release of the standard, this matches data provided by
1733 Unicode 9.0.0. This update introduces significant improvements to the
1734 collation of Unicode characters. This release deviates slightly from
1735 the standard in that the collation element ordering for lowercase and
1736 uppercase LATIN script characters is adjusted to ensure that regular
1737 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1738 is not matched by [a-z]. With the update many locales have been
1739 updated to take advantage of the new collation information. The new
1740 collation information has increased the size of the compiled locale
1741 archive or binary locales.
1743 * The GNU C Library can now be compiled with support for Intel CET, AKA
1744 Intel Control-flow Enforcement Technology. When the library is built
1745 with --enable-cet, the resulting glibc is protected with indirect
1746 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1747 compatible with all existing executables and shared libraries. This
1748 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1749 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1750 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1751 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1752 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1753 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1756 * The GNU C Library now has correct support for ABSOLUTE symbols
1757 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1758 relocated incorrectly or in some cases discarded. The GNU linker can
1759 make use of the newer semantics, but it must communicate it to the
1760 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1761 field) to indicate such support is required.
1763 * Unicode 11.0.0 Support: Character encoding, character type info, and
1764 transliteration tables are all updated to Unicode 11.0.0, using
1765 generator scripts contributed by Mike FABIAN (Red Hat).
1767 * <math.h> functions that round their results to a narrower type are added
1768 from TS 18661-1:2014 and TS 18661-3:2015:
1770 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1771 fMxaddfNx functions.
1773 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1774 fMxsubfNx functions.
1776 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1777 fMxmulfNx functions.
1779 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1780 fMxdivfNx functions.
1782 * Two grammatical forms of month names are now supported for the following
1783 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1784 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1785 support two grammatical forms in abbreviated month names: Catalan, Greek,
1788 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1789 include the support for two grammatical forms of month names.
1791 * Building and running on GNU/Hurd systems now works without out-of-tree
1794 * The renameat2 function has been added, a variant of the renameat function
1795 which has a flags argument. If the flags are zero, the renameat2 function
1796 acts like renameat. If the flag is not zero and there is no kernel
1797 support for renameat2, the function will fail with an errno value of
1798 EINVAL. This is different from the existing gnulib function renameatu,
1799 which performs a plain rename operation in case of a RENAME_NOREPLACE
1800 flags and a non-existing destination (and therefore has a race condition
1801 that can clobber the destination inadvertently).
1803 * The statx function has been added, a variant of the fstatat64
1804 function with an additional flags argument. If there is no direct
1805 kernel support for statx, glibc provides basic stat support based on
1806 the fstatat64 function.
1808 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1809 library if installed. libidn2 version 2.0.5 or later is recommended. If
1810 libidn2 is not available, internationalized domain names are not encoded
1811 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1812 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1813 with an encoding error.) Flags which used to change the IDN encoding and
1814 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1815 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1816 deprecated. They no longer have any effect.
1818 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1819 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1820 range of ELF gABI expressions including such constructs as
1821 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1822 have been further restricted, and where in the past a dynamic string
1823 token sequence may have been interpreted as a literal string it will
1824 now cause a load failure. These load failures were always considered
1825 unspecified behaviour from the perspective of the dynamic loader, and
1826 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1827 results in a load failure now.
1829 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1830 implementation includes all the standard functions provided by
1833 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1834 thrd_detach, thrd_exit, and thrd_join for thread management.
1836 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1837 mtx_destroy for mutual exclusion.
1839 - call_once for function call synchronization.
1841 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1842 cnd_wait for conditional variables.
1844 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1846 Application developers must link against libpthread to use ISO C threads.
1848 Deprecated and removed features, and other changes affecting compatibility:
1850 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1851 installed. Software that was using either header should be updated to
1852 use standard <stdio.h> interfaces instead.
1854 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1855 This was never required by the C standard, and the macros just expanded
1856 to call alternative names for the same functions. If you hoped getc and
1857 putc would provide performance improvements over fgetc and fputc, instead
1858 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1859 necessary, flockfile and funlockfile.
1861 * All stdio functions now treat end-of-file as a sticky condition. If you
1862 read from a file until EOF, and then the file is enlarged by another
1863 process, you must call clearerr or another function with the same effect
1864 (e.g. fseek, rewind) before you can read the additional data. This
1865 corrects a longstanding C99 conformance bug. It is most likely to affect
1866 programs that use stdio to read interactive input from a terminal.
1869 * The macros 'major', 'minor', and 'makedev' are now only available from
1870 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1871 headers that happen to include <sys/types.h>. These macros are rarely
1872 used, not part of POSIX nor XSI, and their names frequently collide with
1873 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1874 further explanation.
1876 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1877 these macros should first include <sys/types.h>, and then include
1878 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1880 * The tilegx*-*-linux-gnu configurations are no longer supported.
1882 * The obsolete function ustat is no longer available to newly linked
1883 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1884 function has been deprecated in favor of fstatfs and statfs.
1886 * The obsolete function nfsservctl is no longer available to newly linked
1887 binaries. This function was specific to systems using the Linux kernel
1888 and could not usefully be used with the GNU C Library on systems with
1889 version 3.1 or later of the Linux kernel.
1891 * The obsolete function name llseek is no longer available to newly linked
1892 binaries. This function was specific to systems using the Linux kernel
1893 and was not declared in a header. Programs should use the lseek64 name
1894 for this function instead.
1896 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1897 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1898 previously selected by them is now always enabled.
1900 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1901 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1902 restriction (rejecting '_' in host names, among other things) has been
1903 removed, for increased compatibility with non-IDN name resolution.
1905 * The fcntl function now have a Long File Support variant named fcntl64. It
1906 is added to fix some Linux Open File Description (OFD) locks usage on non
1907 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1908 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1909 locks act as a cancellation entrypoint.
1911 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1912 ecb_crypt, and des_setparity are no longer available to newly linked
1913 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1914 longer installed. These functions encrypted and decrypted data with the
1915 DES block cipher, which is no longer considered secure. Software that
1916 still uses these functions should switch to a modern cryptography library,
1919 * Reflecting the removal of the encrypt and setkey functions above, the
1920 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1921 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1924 * The obsolete function fcrypt is no longer available to newly linked
1925 binaries. It was just another name for the standard function crypt,
1926 and it has not appeared in any header file in many years.
1928 * We have tentative plans to hand off maintenance of the passphrase-hashing
1929 library, libcrypt, to a separate development project that will, we hope,
1930 keep up better with new passphrase-hashing algorithms. We will continue
1931 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1932 'crypt_r' should not need to change at all; however, distributions will
1933 need to install <crypt.h> and libcrypt from a separate project.
1935 In this release, if the configure option --disable-crypt is used, glibc
1936 will not install <crypt.h> or libcrypt, making room for the separate
1937 project's versions of these files. The plan is to make this the default
1938 behavior in a future release.
1940 Changes to build and runtime requirements:
1942 GNU make 4.0 or later is now required to build glibc.
1944 Security related changes:
1946 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1947 been fixed by removing the glibc-internal IDNA implementation and using
1948 the system-provided libidn2 library instead. Originally reported by Hanno
1949 Böck and Christian Weisgerber.
1951 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1952 architecture could corrupt memory. Reported by Max Horn.
1954 CVE-2018-11236: Very long pathname arguments to realpath function could
1955 result in an integer overflow and buffer overflow. Reported by Alexey
1958 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1959 architecture could write beyond the target buffer, resulting in a buffer
1960 overflow. Reported by Andreas Schwab.
1962 The following bugs are resolved with this release:
1964 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1965 [6889] manual: 'PWD' mentioned but not specified
1966 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1967 when __WORDSIZE != 64
1968 [13762] regex: re_search etc. should return -2 on memory exhaustion
1969 [13888] build: /tmp usage during testing
1970 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1971 [14092] nptl: Support C11 threads
1972 [14095] localedata: Review / update collation data from Unicode / ISO
1974 [14508] libc: -Wformat warnings
1975 [14553] libc: Namespace pollution loff_t in sys/types.h
1976 [14890] libc: Make NT_PRFPREG canonical.
1977 [15105] libc: Extra PLT references with -Os
1978 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1980 [16335] manual: Feature test macro documentation incomplete and out of
1982 [16552] libc: Unify umount implementations in terms of umount2
1983 [17082] libc: htons et al.: statement-expressions prevent use on global
1984 scope with -O1 and higher
1985 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1986 [17438] localedata: pt_BR: wrong d_fmt delimiter
1987 [17662] libc: please implement binding for the new renameat2 syscall
1988 [17721] libc: __restrict defined as /* Ignore */ even in c11
1989 [17979] libc: inconsistency between uchar.h and stdint.h
1990 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1991 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1992 horrible machine code)
1993 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1995 [18471] libc: llseek should be a compat symbol
1996 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1998 [18991] nss: nss_files skips large entry in database
1999 [19239] libc: Including stdlib.h ends up with macros major and minor being
2001 [19463] libc: linknamespace failures when compiled with -Os
2002 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2003 [19527] locale: Normalized charset name not recognized by setlocale
2004 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2005 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2007 [19728] network: out of bounds stack read in libidn function
2008 idna_to_ascii_4i (CVE-2016-6261)
2009 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2010 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2011 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2013 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2014 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2015 [20419] dynamic-link: files with large allocated notes crash in
2017 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2018 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2019 [20980] manual: CFLAGS environment variable replaces vital options
2020 [21163] regex: Assertion failure in pop_fail_stack when executing a
2021 malformed regexp (CVE-2015-8985)
2022 [21234] manual: use of CFLAGS makes glibc detect no optimization
2023 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2024 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2025 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2026 [21508] locale: intl/tst-gettext failure with latest msgfmt
2027 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2028 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2029 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2031 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2033 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2034 [22247] network: Integer overflow in the decode_digit function in
2035 puny_decode.c in libidn (CVE-2017-14062)
2036 [22342] nscd: NSCD not properly caching netgroup
2037 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2038 [22550] localedata: es_ES locale (and other es_* locales): collation
2039 should treat ñ as a primary different character, sync the collation
2040 for Spanish with CLDR
2041 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2042 by gcc configured with --enable-default-pie
2043 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2044 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2045 crossing 2GB threshold (CVE-2017-18269)
2046 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2048 [22735] time: Misleading typo in time.h source comment regarding
2050 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2051 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2052 `__assert_perror_fail ()' to `__assert_fail_base ()'
2053 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2055 [22786] libc: Stack buffer overflow in realpath() if input size is close
2056 to SSIZE_MAX (CVE-2018-11236)
2057 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2058 through an absolute DT_NEEDED path
2059 [22792] build: tcb-offsets.h dependency dropped
2060 [22797] libc: pkey_get() uses non-reserved name of argument
2061 [22807] libc: PTRACE_* constants missing for powerpc
2062 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2063 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2064 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2065 [22848] localedata: ca_ES: update date definitions from CLDR
2066 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2067 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2068 [22896] localedata: Update locale data for an_ES
2069 [22902] math: float128 test failures with GCC 8
2070 [22918] libc: multiple common of `__nss_shadow_database'
2071 [22919] libc: sparc32: backtrace yields infinite backtrace with
2073 [22926] libc: FTBFS on powerpcspe
2074 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2076 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2077 [22947] libc: FAIL: misc/tst-preadvwritev2
2078 [22963] localedata: cs_CZ: Add alternative month names
2079 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2080 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2081 [22998] dynamic-link: execstack tests are disabled when SELinux is
2083 [23005] network: Crash in __res_context_send after memory allocation
2085 [23007] math: strtod cannot handle -nan
2086 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2087 [23036] regex: regex equivalence class regression
2088 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2089 [23069] libc: sigaction broken on riscv64-linux-gnu
2090 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2091 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2092 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2093 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2094 and libc build with -Os)
2095 [23140] localedata: More languages need two forms of month names
2096 [23145] libc: _init/_fini aren't marked as hidden
2097 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2098 [23171] math: C++ iseqsig for long double converts arguments to double
2099 [23178] nscd: sudo will fail when it is run in concurrent with commands
2100 that changes /etc/passwd
2101 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2103 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2104 [23208] localedata: New locale - Lower Sorbian (dsb)
2105 [23233] regex: Memory leak in build_charclass_op function in file
2107 [23236] stdio: Harden function pointers in _IO_str_fields
2108 [23250] nptl: Offset of __private_ss differs from GCC
2109 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2110 -mtune=generic -mfpmath=sse
2111 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2113 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2114 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2116 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2117 [23277] math: nan function should not have const attribute
2118 [23279] math: scanf and strtod wrong for some hex floating-point
2119 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2121 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2122 [23303] build: undefined reference to symbol
2123 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2124 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2126 [23313] stdio: libio vtables validation and standard file object
2128 [23329] libc: The __libc_freeres infrastructure is not properly run across
2130 [23349] libc: Various glibc headers no longer compatible with
2132 [23351] malloc: Remove unused code related to heap dumps and malloc
2134 [23363] stdio: stdio-common/tst-printf.c has non-free license
2135 [23396] regex: Regex equivalence regression in single-byte locales
2136 [23422] localedata: oc_FR: More updates of locale data
2137 [23442] build: New warning with GCC 8
2138 [23448] libc: Out of bounds access in IBM-1390 converter
2139 [23456] libc: Wrong index_cpu_LZCNT
2140 [23458] build: tst-get-cpu-features-static isn't added to tests
2141 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2143 [23467] dynamic-link: x86/CET: A property note parser bug
2150 * The GNU C Library can now be compiled with support for building static
2151 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2152 executables are like static executables but can be loaded at any address
2153 and provide additional security hardening benefits at the cost of some
2154 memory and performance. When the library is built with --enable-static-pie
2155 the resulting libc.a is usable with GCC 8 and above to create static PIE
2156 executables using the GCC option '-static-pie'. This feature is currently
2157 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2158 aarch64 with binutils 2.30 or later.
2160 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2161 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2164 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2166 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2168 * In order to support faster and safer process termination the malloc API
2169 family of functions will no longer print a failure address and stack
2170 backtrace after detecting heap corruption. The goal is to minimize the
2171 amount of work done after corruption is detected and to avoid potential
2172 security issues in continued process execution. Reducing shutdown time
2173 leads to lower overall process restart latency, so there is benefit both
2174 from a security and performance perspective.
2176 * The abort function terminates the process immediately, without flushing
2177 stdio streams. Previous glibc versions used to flush streams, resulting
2178 in deadlocks and further data corruption. This change also affects
2179 process aborts as the result of assertion failures.
2181 * On platforms where long double has the IEEE binary128 format (aarch64,
2182 alpha, mips64, riscv, s390 and sparc), the math library now implements
2183 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2184 These are the same interfaces added in version 2.26 for some platforms where
2185 this format is supported but is not the format of long double.
2187 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2188 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2189 implements interfaces for that type, as defined by ISO/IEC TS
2190 18661-3:2015. These are corresponding interfaces to those supported for
2193 * The math library now implements interfaces for the _Float32, _Float64 and
2194 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2195 corresponding interfaces to those supported for _Float128.
2197 * glibc now implements the memfd_create and mlock2 functions on Linux.
2199 * Support for memory protection keys was added. The <sys/mman.h> header now
2200 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2203 * The copy_file_range function was added.
2205 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2207 * The ldconfig utility now processes `include' directives using the C/POSIX
2208 collation ordering. Previous glibc versions used locale-specific
2209 ordering, the change might break systems that relied on that.
2211 * Support for two grammatical forms of month names has been added.
2212 In a call to strftime, the "%B" and "%b" format specifiers will now
2213 produce the grammatical form required when the month is used as part
2214 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2215 required when the month is named by itself. For instance, in Greek
2216 and in many Slavic and Baltic languages, "%B" will produce the month
2217 in genitive case, and "%OB" will produce the month in nominative case.
2219 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2220 are all valid and will all accept any known form of month
2221 name---standalone or complete, abbreviated or full. In a call to
2222 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2223 the strings used by "%B" and "%b", respectively. New query
2224 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2225 used by "%OB" and "%Ob", respectively.
2227 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2228 define the strings for %OB and %Ob, respectively; these have the
2229 same syntax as "mon" and "abmon". These arrays are optional; if they
2230 are not provided then they have the same content as "mon" and "abmon",
2233 These features are provided for locales which define "alt_mon" and/or
2234 "ab_alt_mon" in their locale source data. This release includes such
2235 alternative month name data for the following languages: Belarusian,
2236 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2238 This feature is currently a GNU extension, but it is expected to
2239 be added to the next revision of POSIX, and it is also already
2240 available on some BSD-derived operating systems.
2242 This feature will cause existing statically compiled applications
2243 to fail to load locales and fall back to the builtin C/POSIX locales.
2244 See notes below for other changes affecting compatibility.
2246 * Support for the RISC-V ISA running on Linux has been added. This port
2247 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2248 for the following ISA and ABI pairs:
2254 Deprecated and removed features, and other changes affecting compatibility:
2256 * Statically compiled applications attempting to load locales compiled for the
2257 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2258 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2259 support for two grammatical forms of the month names, also extends the locale
2260 data binary format. Static applications needing locale support must be
2261 recompiled to match the runtime and data they are deployed with. In some
2262 distributions there is an upgrade window where dynamically linked applications
2263 may use a new library but the old locale data and also fall back to the
2264 builtin C/POSIX locales; restarting the application process is sufficient to
2267 * Support for statically linked applications which call dlopen is deprecated
2268 and will be removed in a future version of glibc. Applications which call
2269 dlopen need to be linked dynamically instead.
2271 * Support for old programs which use internal stdio data structures and
2272 functions is deprecated. This includes programs which use the C++ streams
2273 provided by libstdc++ in GCC 2.95. Programs which use the internal
2274 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2275 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2276 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2277 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2278 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2279 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2280 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2281 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2282 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2283 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2284 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2285 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2286 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2287 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2288 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2289 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2290 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2291 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2292 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2293 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2294 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2295 future version of glibc. Unlike other symbol removals, these old
2296 applications will not be supported using compatibility symbols.
2298 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2299 defined by <sys/ptrace.h>.
2301 * libm no longer supports SVID error handling (calling a user-provided
2302 matherr function on error) or the _LIB_VERSION variable to control error
2303 handling. (SVID error handling and the _LIB_VERSION variable still work
2304 for binaries linked against older versions of the GNU C Library.) The
2305 libieee.a library is no longer provided. math.h no longer defines struct
2306 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2307 TLOSS, PLOSS and HUGE.
2309 * The libm functions pow10, pow10f and pow10l are no longer supported for
2310 new programs. Programs should use the standard names exp10, exp10f and
2311 exp10l for these functions instead.
2313 * The mcontext_t type is no longer the same as struct sigcontext. On
2314 platforms where it was previously the same, this changes the C++ name
2315 mangling for interfaces involving this type.
2317 * The add-ons mechanism for building additional packages at the same time as
2318 glibc has been removed. The --enable-add-ons configure option is now
2321 * The --without-fp configure option is now ignored. Whether hardware
2322 floating-point instructions are used is now configured based on whether
2323 the compiler used at configure time (without any options implied by a
2324 --with-cpu= configure option) uses such instructions.
2326 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2327 the specified string can be parsed as a domain name.
2329 * In the malloc_info output, the <heap> element may contain another <aspace>
2330 element, "subheaps", which contains the number of sub-heaps.
2332 * The libresolv function p_secstodate is no longer supported for new
2335 * The tilepro-*-linux-gnu configuration is no longer supported.
2337 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2338 and will be removed in a future release. Software that is still using
2339 either header should be updated to use standard <stdio.h> interfaces
2342 libio.h was originally the header for a set of supported GNU extensions,
2343 but they have not been maintained as such in many years, they are now
2344 standing in the way of improvements to stdio, and we don't think there are
2345 any remaining external users. _G_config.h was never intended for public
2346 use, but predates the bits convention.
2348 Changes to build and runtime requirements:
2350 * bison version 2.7 or later is required to generate code in the 'intl'
2353 Security related changes:
2355 CVE-2009-5064: The ldd script would sometimes run the program under
2356 examination directly, without preventing code execution through the
2357 dynamic linker. (The glibc project disputes that this is a security
2358 vulnerability; only trusted binaries must be examined using the ldd
2361 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2362 suffered from a one-byte overflow during ~ operator processing (either
2363 on the stack or the heap, depending on the length of the user name).
2364 Reported by Tim Rühsen.
2366 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2367 would sometimes fail to free memory allocated during ~ operator
2368 processing, leading to a memory leak and, potentially, to a denial
2371 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2372 without GLOB_NOESCAPE, could write past the end of a buffer while
2373 unescaping user names. Reported by Tim Rühsen.
2375 CVE-2017-17426: The malloc function, when called with an object size near
2376 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2377 instead of NULL. This was a regression introduced with the new malloc
2378 thread cache in glibc 2.26. Reported by Iain Buclaw.
2380 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2381 to the allocation of too much memory. (This is not a security bug per se,
2382 it is mentioned here only because of the CVE assignment.) Reported by
2385 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2386 of the number of search path components. (This is not a security
2387 vulnerability per se because no trust boundary is crossed if the fix for
2388 CVE-2017-1000366 has been applied, but it is mentioned here only because
2389 of the CVE assignment.) Reported by Qualys.
2391 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2392 for AT_SECURE or SUID binaries could be used to load libraries from the
2395 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2396 succeeds without returning an absolute path due to unexpected behaviour
2397 of the Linux kernel getcwd syscall. Reported by halfdog.
2399 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2400 an object size near the value of SIZE_MAX, would return a pointer to a
2401 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2403 CVE-2018-6551: The malloc function, when called with an object size near
2404 the value of SIZE_MAX, would return a pointer to a buffer which is too
2405 small, instead of NULL.
2407 The following bugs are resolved with this release:
2409 [866] glob: glob should match dangling symlinks
2410 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2411 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2413 [5997] math: Very slow execution of sinf function
2414 [10580] localedata: hr_HR: updated locale
2415 [10871] locale: 'mon' array should contain both nominative and genitive
2417 [12349] localedata: eu_ES: incorrect thousands separator
2418 [13605] localedata: shn_MM: new Shan locale
2419 [13805] localedata: ru_RU: currency should use ',' as radix point
2420 [13953] localedata: km_KH: locale update
2421 [13994] localedata: mjw_IN: new locale
2422 [14121] build: make writes .mo files in po directory
2423 [14333] libc: Fix the race between atexit() and exit()
2424 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2425 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2427 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2428 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2429 width Latin characters
2430 [15332] localedata: es_CU: locale update
2431 [15436] stdio: Don't close or flush stdio streams on abort
2432 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2434 [16148] localedata: ca_ES: incorrect thousands separator
2435 [16750] dynamic-link: ldd should not try to execute the binaries
2437 [16777] localedata: pl_PL: incorrect thousands separator in locale
2438 [16905] localedata: hanzi: new collation
2439 [17563] localedata: cmn_TW: add hanzi collation
2440 [17750] localedata: wrong collation order of diacritics in most locales
2441 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2443 [17956] build: Build fails on missing definitions from header file
2444 nss/nss.h when Mozilla NSS is used for cryptography
2445 [18203] libc: realpath() does not handle unreachable paths correctly
2446 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2447 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2448 [18822] libc: Internal functions are called via PLT
2449 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2450 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2451 [19574] libc: glibc should support building static PIE binaries
2452 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2454 [19971] glob: glob: Do not skip entries with zero d_ino values
2455 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2456 [20008] localedata: km_KH: convert to translit_neutral
2457 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2458 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2459 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2460 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2461 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2463 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2464 they're set, wrong errors returned by gaih_inet when lookup functions
2466 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2467 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2469 [20952] localedata: yuw_PG: new locale
2470 [21084] localedata: charmaps/IBM858: new codepage
2471 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2472 [21242] libc: assert gives pedantic warning in old gcc versions
2473 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2474 __regcall calling convention
2475 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2476 [21326] libc: C99 functions are not declared for C++11 and later if
2477 _GNU_SOURCE is not predefined by g++
2478 [21457] libc: sys/ucontext.h namespace
2479 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2480 [21660] math: GCC fails to compile a formula with tgmath.h
2481 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2482 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2483 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2484 [21684] math: tgmath.h handling of complex integers
2485 [21685] math: tgmath.h handling of bit-fields
2486 [21686] math: tgmath.h handling of __int128
2487 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2489 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2491 [21750] localedata: column width of characters incompatible with classical
2493 [21754] malloc: malloc: Perform as little work as possible after heap
2494 consistency check failures
2495 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2496 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2497 [21791] string: Unused XXX_chk_XXX functions in libc.a
2498 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2500 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2502 [21845] localedata: Added new Locale bho_NP
2503 [21853] localedata: Fix abday Which looks same as day in zh_SG
2504 [21854] localedata: Added New Locale en_SC
2505 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2506 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2507 _dl_runtime_resolve_avx_slow
2508 [21885] network: getaddrinfo: gethosts does not release resolver context
2509 on memory allocation failure
2510 [21899] libc: XPG4.2 sigaction namespace
2511 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2513 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2515 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2516 errno value, causing getaddrinfo to fail
2517 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2518 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2519 instead of EAI_NODATA
2520 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2521 constant PTRACE_SEIZE_DEVEL
2522 [21930] math: C-only gcc builtins used in <math.h> isinf
2523 [21932] network: Unpaired __resolv_context_get in generic get*_r
2525 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2526 [21944] libc: sigval namespace
2527 [21951] localedata: Update hanzi collation by stroke
2528 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2529 sysdeps/x86_64/fpu/e_expf.S
2530 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2531 allocation in syscall loops)
2532 [21959] localedata: Fix Country name for xh_ZA
2533 [21960] localedata: Fix abmon for bem_ZM
2534 [21966] math: AVX2 mathvec functions use FMA without checking
2535 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2536 [21971] localedata: Added New Locale for mfe_MU
2537 [21972] libc: assert macro requires operator== (int) for its argument type
2538 [21973] math: [sparc] libm missing sqrtl compat symbol
2539 [21974] libc: Remove __bb_init_func and __bb_exit_func
2540 [21982] string: stratcliff.c: error: assuming signed overflow does not
2542 [21986] stdio: __guess_grouping is called incorrectly
2543 [21987] math: [sparc32] wrong bits/long-double.h installed
2544 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2546 [22022] localedata: Missing country_name for mni_IN
2547 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2549 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2551 [22026] locale: iconv_open: heap overflow on gconv_init failure
2552 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2553 [22035] math: [m68k] bits/math-inline.h macro namespace
2554 [22038] localedata: Fix abbreviated weeks and months for Somali
2555 [22044] localedata: Remove redundant data for Limburgish Language
2556 [22050] malloc: Linking with -lmcheck does not hook
2557 __malloc_initialize_hook correctly
2558 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2559 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2560 [22070] localedata: charmaps/UTF-8: wcwidth for
2561 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2562 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2563 Jungseong and Jongseong) should be 0
2564 [22078] nss: nss_files performance issue in multi mode
2565 [22082] math: bits/math-finite.h exp10 condition
2566 [22086] libc: pcprofiledump incorrect cross-endian condition
2567 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2568 [22095] network: Name server address allocation memory leak in resolv.conf
2570 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2572 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2573 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2575 [22111] malloc: malloc: per thread cache is not returned when thread exits
2576 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2577 [22134] libc: [linux] implement fexecve with execveat
2578 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2580 [22145] libc: ttyname() gives up too early in the face of namespaces
2581 [22146] math: C++ build issue with float128 on x86_64
2582 [22153] nptl: nptl: save error code before process termination
2583 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2584 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2585 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2586 [22165] libc: [hppa] Text relocations in libc.so
2587 [22180] libc: destructor registered via __cxa_atexit is called twice
2588 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2589 symlinks") cause "make" segfaults
2590 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2592 [22207] libc: FAIL: stdlib/test-atexit-race
2593 [22225] math: nearbyint arithmetic moved before feholdexcept
2594 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2595 [22235] math: iscanonical in C++ and float128
2596 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2597 the svid compat wrapper
2598 [22244] math: ynf and yn are wrong without the svid compat wrapper
2599 [22273] libc: Improper assert in Linux posix_spawn implementation
2600 [22284] libc: -pg -pie doesn't work
2601 [22292] locale: localedef exits with error 4 when it should be error 1
2602 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2603 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2605 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2606 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2608 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2609 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2610 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2611 [22322] libc: [mips64] wrong bits/long-double.h installed
2612 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2613 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2615 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2616 [22343] malloc: Integer overflow in posix_memalign
2617 [22347] libc: getrandom() returns the number of bytes that were copied to
2618 the buffer even though the comments say "Return 0 on success and -1 on
2620 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2621 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2623 [22370] dynamic-link: Incorrect note padding check
2624 [22375] libc: malloc returns pointer from tcache_get when should return
2625 NULL (CVE-2017-17426)
2626 [22377] math: iseqsig, float128 and C++
2627 [22382] localedata: Error in tpi_PG locale
2628 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2629 inside the ASCII printable range
2630 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2632 [22403] localedata: Slash needs escaping in some locales
2633 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2634 [22409] network: res_hnok does not accept some host names used on the
2636 [22412] network: res_dnok, res_hnok should perform syntax checks
2637 [22413] network: ns_name_pton ignores syntactically invalid trailing
2639 [22415] stdio: setvbuf can lead to invalid free/segfault
2640 [22432] build: Non-deterministic build
2641 [22439] malloc: malloc_info should compute summary statistics for all sub-
2643 [22442] network: if_nametoindex could report index for the wrong
2644 networking interface
2645 [22446] build: aliasing violation calling readlink in handle_request
2646 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2647 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2648 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2649 __nscd_hash/__nss_hash
2650 [22463] network: p_secstodate overflow handling
2651 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2652 [22478] libc: sigwait can fail with EINTR
2653 [22505] libc: ldconfig processes include directive in locale-specific
2655 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2656 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2657 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2658 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2659 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2660 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2661 same as for Croatian
2662 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2663 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2664 [22577] libc: missing newline after "cannot allocate TLS data structures
2666 [22588] manual: manual/conf.texi: missing underscore in front of
2668 [22593] math: nextafter and nexttoward are declared with const attribute
2669 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2670 [22603] string: ia64 memchr overflows internal pointer check
2671 [22605] libc: SH clone does not set the exit code correctly
2672 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2674 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2675 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2676 modified in case of success
2677 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2678 [22615] manual: manual: ambiguous wording about errno value in case of
2680 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2682 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2683 binaries or if /proc is not mounted (CVE-2017-16997)
2684 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2685 [22630] build: $(no-pie-ldflag) is no longer effective
2686 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2687 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2688 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2689 [22637] nptl: guard size is subtracted from thread stack size instead of
2691 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2692 [22657] localedata: hu_HU: Avoid double space in date
2693 [22660] math: fmax, fmin sNaN handling on alpha
2694 [22664] libc: New warning of GCC8
2695 [22665] math: alpha: ceil and floor raise inexact exceptions
2696 [22666] math: alpha: trunc raise inexact exceptions
2697 [22667] libc: makecontext lacks stack alignment on i386
2698 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2699 [22679] libc: getcwd(3) can succeed without returning an absolute path
2701 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2702 elision and tunables
2703 [22687] math: [powerpc-nofpu] complex long double functions spurious
2705 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2706 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2707 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2709 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2710 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2712 [22701] nis: Incomplete removal of libnsl
2713 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2714 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2715 [22715] dynamic-link: FAIL: elf/tst-audit10
2716 [22719] libc: Backtrace tests fail on hppa
2717 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2718 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2719 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2720 before the first call to crypt_r () in crypt/badsalttest.c
2727 * A per-thread cache has been added to malloc. Access to the cache requires
2728 no locks and therefore significantly accelerates the fast path to allocate
2729 and free small amounts of memory. Refilling an empty cache requires locking
2730 the underlying arena. Performance measurements show significant gains in a
2731 wide variety of user workloads. Workloads were captured using a special
2732 instrumented malloc and analyzed with a malloc simulator. Contributed by
2733 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2735 * Unicode 10.0.0 Support: Character encoding, character type info, and
2736 transliteration tables are all updated to Unicode 10.0.0, using
2737 generator scripts contributed by Mike FABIAN (Red Hat).
2738 These updates cause user visible changes, especially the changes in
2739 wcwidth for many emoji characters cause problems when emoji sequences
2740 are rendered with pango, see for example:
2741 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2743 * Collation of Hungarian has been overhauled and is now consistent with "The
2744 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2747 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2749 - The GNU C Library will now detect when /etc/resolv.conf has been
2750 modified and reload the changed configuration. The new resolver option
2751 “no-reload” (RES_NORELOAD) disables this behavior.
2753 - The GNU C Library now supports an arbitrary number of search domains
2754 (configured using the “search” directive in /etc/resolv.conf);
2755 previously, there was a hard limit of six domains. For backward
2756 compatibility, applications that directly modify the ‘_res’ global
2757 object are still limited to six search domains.
2759 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2760 Library will now randomly pick a name server from the configuration as a
2761 starting point. (Previously, the second name server was always used.)
2763 * The tunables feature is now enabled by default. This allows users to tweak
2764 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2766 * New function reallocarray, which resizes an allocated block (like realloc)
2767 to the product of two sizes, with a guaranteed clean failure upon integer
2768 overflow in the multiplication. Originally from OpenBSD, contributed by
2769 Dennis Wölfing and Rüdiger Sonderfeld.
2771 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2772 These are extended versions of preadv and pwritev, respectively, taking an
2773 additional flags argument. The set of supported flags depends on the
2774 running kernel; full support currently requires kernel 4.7 or later.
2776 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2777 create a new session ID for the spawned process. This feature is
2778 scheduled to be added to the next major revision of POSIX; for the time
2779 being, it is available under _GNU_SOURCE.
2781 * errno.h is now safe to use from C-preprocessed assembly language on all
2782 supported operating systems. In this context, it will only define the
2783 Exxxx constants, as preprocessor macros expanding to integer literals.
2785 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2786 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2787 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2788 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2790 To compile programs that use this feature, the compiler must support
2791 128-bit floating point with the type name _Float128 (as defined by TS
2792 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2793 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2794 must be defined to make the new interfaces visible.
2796 The new functions and macros correspond to those present for other
2797 floating-point types (except for a few obsolescent interfaces not
2798 supported for the new type), with F128 or f128 suffixes; for example,
2799 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2800 printf or scanf formats for the new type; the strfromf128 and strtof128
2801 interfaces should be used instead.
2803 Deprecated and removed features, and other changes affecting compatibility:
2805 * The synchronization that pthread_spin_unlock performs has been changed to
2806 now be equivalent to a C11 atomic store with release memory order to the
2807 spin lock's memory location. Previously, several (but not all)
2808 architectures used stronger synchronization (e.g., containing what is
2809 often called a full barrier). This change can improve performance, but
2810 may affect odd fringe uses of spin locks that depend on the previous
2811 behavior (e.g., using spin locks as atomic variables to try to implement
2812 Dekker's mutual exclusion algorithm).
2814 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2817 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2818 will only be built and installed when the GNU C Library is configured with
2819 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2820 as TIRPC or rpcsvc-proto, to be used.
2822 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2823 libnss_compat, are deprecated, and will not be built or installed by
2826 The NIS(+) support library, libnsl, is also deprecated. By default, a
2827 compatibility shared library will be built and installed, but not headers
2828 or development libraries. Only a few NIS-related programs require this
2829 library. (In particular, the GNU C Library has never required programs
2830 that use 'gethostbyname' to be linked with libnsl.)
2832 Replacement implementations based on TIRPC, which additionally support
2833 IPv6, are available from <https://github.com/thkukuk/>. The configure
2834 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2835 name service modules, to be built and installed.
2837 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2838 support is enabled, the configured recursive resolver must support EDNS.
2839 (Responding to EDNS-enabled queries with responses which are not
2840 EDNS-enabled is fine, but FORMERR responses are not.)
2842 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2843 servers have not supported this opcode for a long time.
2845 * The _res_opcodes variable has been removed from libresolv. It had been
2846 exported by accident.
2848 * <string.h> no longer includes inline versions of any string functions,
2849 as this kind of optimization is better done by the compiler. The macros
2850 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2852 * The nonstandard header <xlocale.h> has been removed. Most programs should
2853 use <locale.h> instead. If you have a specific need for the definition of
2854 locale_t with no other declarations, please contact
2855 libc-alpha@sourceware.org and explain.
2857 * The obsolete header <sys/ultrasound.h> has been removed.
2859 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2861 * The obsolete function cfree has been removed. Applications should use
2864 * The stack_t type no longer has the name struct sigaltstack. This changes
2865 the C++ name mangling for interfaces involving this type.
2867 * The ucontext_t type no longer has the name struct ucontext. This changes
2868 the C++ name mangling for interfaces involving this type.
2870 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2871 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2872 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2873 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2874 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2875 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2876 fpregset_t type no longer has the name struct fpu. This changes the C++
2877 name mangling for interfaces involving those types.
2879 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2880 synced with the kernel:
2882 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2883 are not supported on this architecture and have been removed.
2885 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2886 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2887 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2889 Programs that assume the GET/SETREGS ptrace requests are universally
2890 available will now fail to build, instead of malfunctioning at runtime.
2892 Changes to build and runtime requirements:
2894 * Linux kernel 3.2 or later is required at runtime, on all architectures
2895 supported by that kernel. (This is a change from version 2.25 only for
2898 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2900 * On most architectures, GCC 4.9 or later is required to build the GNU C
2901 Library. On powerpc64le, GCC 6.2 or later is required.
2903 Older GCC versions and non-GNU compilers are still supported when
2904 compiling programs that use the GNU C Library. (We do not know exactly
2905 how old, and some GNU extensions to C may be _de facto_ required. If you
2906 are interested in helping us make this statement less vague, please
2907 contact libc-alpha@sourceware.org.)
2909 Security related changes:
2911 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2912 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2914 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2915 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2917 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2918 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2921 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2922 fixed (CVE-2017-12133).
2924 The following bugs are resolved with this release:
2926 [984] network: Respond to changed resolv.conf in gethostbyname
2927 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2928 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2930 [12189] libc: __stack_chk_fail should not attempt a backtrace
2932 [14096] time: Race condition on timezone/tst-timezone.out
2933 [14172] localedata: az_IR: new locale
2934 [14995] build: glibc fails to build if gold is the default linker, even if
2936 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2937 [16637] network: inet_pton function is accepting IPv6 with bad format
2938 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2939 x86 and other generic code
2940 [16875] localedata: ko_KR: fix lang_name
2941 [17225] localedata: ar_SY: localized month names for May and June are
2943 [17297] localedata: da_DK: wrong date_fmt string
2944 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2945 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2946 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2947 [19066] localedata: ar_SA abbreviated day and month names are in English
2948 [19569] network: resolv: Support an arbitrary number of search domains
2949 [19570] network: Implement random DNS server selection in the stub
2951 [19838] locale: localedef fails on PA-RISC
2952 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2953 order of 0D36 and 0D37
2954 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2956 [20098] libc: FAIL: debug/backtrace-tst on hppa
2957 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2959 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2961 [20313] localedata: Update locale data to Unicode 9.0
2962 [20424] manual: Document how to provide a malloc replacement
2963 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2965 [20686] locale: Add el_GR@euro to SUPPORTED.
2966 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2967 failures consistently
2968 [21015] dynamic-link: Document and fix --enable-bind-now
2969 [21016] nptl: pthread_cond support is broken on hppa
2970 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2971 frame-pointer on i386
2972 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2974 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2975 [21088] libc: Build fails with --enable-static-nss
2976 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2977 generic c code is used
2978 [21109] libc: Tunables broken on big-endian
2979 [21112] math: powf has large ulp errors with base close to 1 and exponent
2981 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2983 [21120] malloc: glibc malloc is incompatible with GCC 7
2984 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2986 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2987 (-0.0) when linking with -lieee
2988 [21171] math: log10, log2 and lgamma return incorrect results
2989 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2990 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2991 [21207] localedata: ce_RU: update weekdays from CLDR
2992 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2993 [21217] localedata: Update months from CLDR-31
2994 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2995 [21243] libc: support_delete_temp_file should issue warning for failed
2997 [21244] libc: support resolv_test_start() socket fd close should be
2999 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3000 new posix_spawn implementation
3001 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3002 leads to lower CPU frequency
3003 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3004 [21261] libc: [sparc64] bits/setjmp.h namespace
3005 [21267] network: [mips] bits/socket.h IOC* namespace
3006 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3007 [21270] libc: mmap64 silently truncates large offset values
3008 [21275] libc: posix_spawn always crashes on ia64 now
3009 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3010 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3011 [21289] libc: Incorrect declaration for 32-bit platforms with
3012 _FILE_OFFSET_BITS=64 causes build error
3013 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3014 not support gethostbyname4_r
3015 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3017 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3019 [21340] libc: Support POSIX_SPAWN_SETSID
3020 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3021 [21359] network: ns_name_pack needs additional byte in destination buffer
3022 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3023 against fragmentation attacks (CVE-2017-12132)
3024 [21369] network: resolv: Remove EDNS fallback
3025 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3027 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3028 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3029 [21393] stdio: Missing dup3 error check in freopen, freopen64
3030 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3031 [21399] localedata: Bad description for U00EC in
3032 localedata/charmaps/CP1254
3033 [21411] malloc: realloc documentation error
3034 [21426] network: sys/socket.h uio.h namespace
3035 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3036 [21445] libc: signal.h bsd_signal namespace
3037 [21455] network: Network headers stdint.h namespace
3038 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3040 [21475] network: resolv: Overlong search path is truncated mid-label
3041 [21511] libc: sigstack namespace
3042 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3043 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3044 bits/syscall.h: No such file or directory
3045 [21517] libc: struct sigaltstack namespace
3046 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3047 [21533] localedata: Update locale data to Unicode 10.0
3049 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3050 junk at end of line, first unrecognized character is `@'
3051 [21538] libc: SIG_HOLD missing for XPG4
3052 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3053 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3054 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3055 [21543] libc: sigevent namespace
3056 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3057 size for general purpose registers in mcontext_t structure
3058 [21550] libc: sigwait namespace
3059 [21552] libc: XPG4 bsd_signal namespace
3060 [21554] libc: sigpause namespace
3061 [21560] libc: sys/wait.h signal.h namespace
3062 [21561] libc: waitid namespace
3063 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3064 '/usr/include/stdlib.h': Permission denied
3065 [21575] libc: sys/wait.h missing struct rusage definition
3066 [21584] libc: sigaltstack etc namespace
3067 [21597] libc: siginterrupt namespace
3068 [21607] math: hppa: FAIL: math/test-tgmath
3069 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3071 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3072 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3073 stack and heap (CVE-2017-1000366)
3074 [21625] libc: wait3 namespace
3075 [21654] nss: Incorrect pointer alignment in NSS group merge result
3077 [21657] network: Parse interface zone id for node-local multicast
3078 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3080 [21666] libc: .symver is used on common symbol
3081 [21668] network: resolv: res_init cross-thread broadcast introduces race
3083 [21687] math: tgmath.h totalorder, totalordermag return type
3084 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3086 [21696] libc: Incorrect assumption of of __cpu_mask in
3087 posix/sched_cpucount.c
3088 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3089 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3091 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3092 leading to relocation crash
3093 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3094 `resolv_conf_matches (resp, conf)' failed.
3095 [21710] localedata: Added Samoan language locale for Samoa
3096 [21711] localedata: Pashto yesstr/nostr locale are missing
3097 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3098 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3099 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3100 [21723] localedata: yesstr/nostr missing for Chinese language locale
3101 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3103 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3105 [21728] localedata: New Locale for Tongan language
3106 [21729] localedata: incorrect LC_NAME fields for hi_IN
3107 [21733] localedata: yesstr and nostr are missing for zh_HK
3108 [21734] localedata: Missing yesstr and nostr are for kw_GB
3109 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3110 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3111 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3112 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3114 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3116 [21749] localedata: Wrong abbreviated day name (“abday”) for
3118 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3119 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3120 [21759] localedata: missing yesstr and nostr for Tigrinya
3121 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3122 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3123 [21767] localedata: Missing Bislama locales
3124 [21768] localedata: Missing yesstr and nostr for aa_ET
3125 [21770] localedata: Missing Field in li_NL
3126 [21778] nptl: Robust mutex may deadlock
3127 [21779] libc: MicroBlaze segfaults when loading libpthread
3128 [21783] localedata: Fix int_select international_call_prefixes
3129 [21784] localedata: Inconsistency in country_isbn
3130 [21788] localedata: Missing Country Postal Abbreviations
3131 [21794] localedata: Added-country_isbn-for-Italy
3132 [21795] localedata: Add/Fix country_isbn for France
3133 [21796] localedata: Added country_isbn for Republic of Korea
3134 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3135 [21799] localedata: Added int_select international_call_prefixes
3136 [21801] localedata: Added int_select international_call_prefixes
3137 [21804] nptl: Double semicolon in thread-shared-types.h
3138 [21807] localedata: LC_ADDRESS fix for pap_CW
3139 [21808] localedata: Fix LC_ADDRESS for pap_AW
3140 [21821] localedata: Added country_name in mai_IN
3141 [21822] localedata: Fix LC_TIME for mai_IN
3142 [21823] localedata: missing yesstr, nostr for sa_IN
3143 [21825] localedata: Fix name_mrs for mag_IN
3144 [21828] localedata: 2.26 changelog should mention user visible changes
3146 [21835] localedata: Added Maithili language locale for Nepal
3147 [21838] localedata: Removed redundant data for the_NP
3148 [21839] localedata: Fix LC_MONETARY for ta_LK
3149 [21844] localedata: Fix Latin characters and Months Sequence.
3150 [21848] localedata: Fix mai_NP Title Name
3155 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3156 24731-2:2010, is supported to enable declarations of functions from that
3157 TR. Note that not all functions from that TR are supported by the GNU C
3160 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3161 18661-1:2014, is supported to enable declarations of functions and macros
3162 from that TS. Note that not all features from that TS are supported by
3165 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3166 18661-4:2015, is supported to enable declarations of functions and macros
3167 from that TS. Note that most features from that TS are not supported by
3170 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3171 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3172 Since the GNU C Library defaults to a much newer revision of POSIX, this
3173 will only affect programs that specifically request an old conformance
3174 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3175 see a change in the visible declarations, but a program compiled with
3176 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3179 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3180 defined by all multithreaded code, but glibc has not required this for
3183 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3184 means that in a future release, the macros “major”, “minor”, and “makedev”
3185 will only be available from <sys/sysmacros.h>.
3187 These macros are not part of POSIX nor XSI, and their names frequently
3188 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3189 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3190 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3193 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3194 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3195 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3197 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3198 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3199 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3200 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3201 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3202 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3203 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3204 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3205 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3206 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3207 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3210 * New <math.h> features are added from TS 18661-1:2014:
3212 - Signaling NaN macros: SNANF, SNAN, SNANL.
3214 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3215 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3216 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3218 - llogb functions: the llogb, llogbf and llogbl functions, and the
3219 FP_LLOGB0 and FP_LLOGBNAN macros.
3221 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3224 - Comparison macros: iseqsig.
3226 - Classification macros: iscanonical, issubnormal, iszero.
3228 - Total order functions: totalorder, totalorderf, totalorderl,
3229 totalordermag, totalordermagf, totalordermagl.
3231 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3233 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3234 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3236 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3237 are added to libc. They convert a floating-point number into string.
3239 * Most of glibc can now be built with the stack smashing protector enabled.
3240 It is recommended to build glibc with --enable-stack-protector=strong.
3241 Implemented by Nick Alcock (Oracle).
3243 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3244 intended to be used instead of memset() to erase sensitive data after use;
3245 the compiler will not optimize out calls to explicit_bzero even if they
3246 are "unnecessary" (in the sense that no _correct_ program can observe the
3247 effects of the memory clear).
3249 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3250 to float instead of double. This does not affect the ABI of any libraries
3251 that are part of the GNU C Library, but may affect the ABI of other
3252 libraries that use this type in their interfaces.
3254 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3255 float_t and double_t types are now defined to long double instead of float
3256 and double. These options are not the default, and this does not affect
3257 the ABI of any libraries that are part of the GNU C Library, but it may
3258 affect the ABI of other libraries that use this type in their interfaces,
3259 if they are compiled or used with those options.
3261 * The getentropy and getrandom functions, and the <sys/random.h> header file
3264 * The buffer size for byte-oriented stdio streams is now limited to 8192
3265 bytes by default. Previously, on Linux, the default buffer size on most
3266 file systems was 4096 bytes (and thus remains unchanged), except on
3267 network file systems, where the buffer size was unpredictable and could be
3268 as large as several megabytes.
3270 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3271 for the Linux quota interface which predates kernel version 2.4.22 has
3274 * The malloc_get_state and malloc_set_state functions have been removed.
3275 Already-existing binaries that dynamically link to these functions will
3276 get a hidden implementation in which malloc_get_state is a stub. As far
3277 as we know, these functions are used only by GNU Emacs and this change
3278 will not adversely affect already-built Emacs executables. Any undumped
3279 Emacs executables, which normally exist only during an Emacs build, should
3280 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3282 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3283 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3284 “no-ip6-dotint” had already been the default, and support for the
3285 “ip6-dotint” option was removed from the Internet in 2006.
3287 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3288 flag from <resolv.h> have been removed. The option relied on a
3289 backwards-incompatible DNS extension which was never deployed on the
3292 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3293 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3294 They were already unimplemented.
3296 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3297 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3298 removed again from the IETF name lookup interface specification in RFC
3299 2553. Applications should use getaddrinfo instead.
3301 * DNSSEC-related declarations and definitions have been removed from the
3302 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3303 decode the data part of DNSSEC record types. Previous versions of glibc
3304 only implemented minimal support for the previous version of DNSSEC, which
3305 is incompatible with the currently deployed version.
3307 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3308 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3309 <arpa/nameser.h> header file because the distinction between RR types and
3310 meta-RR types is not officially standardized, subject to revision, and
3311 thus not suitable for encoding in a macro.
3313 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3314 and rhook members of the res_state type in <resolv.h> have been removed.
3315 The glibc stub resolver did not support these hooks, but the header file
3316 did not reflect that.
3318 * For multi-arch support it is recommended to use a GCC which has
3319 been built with support for GNU indirect functions. This ensures
3320 that correct debugging information is generated for functions
3321 selected by IFUNC resolvers. This support can either be enabled by
3322 configuring GCC with '--enable-gnu-indirect-function', or by
3323 enabling it by default by setting 'default_gnu_indirect_function'
3324 variable for a particular architecture in the GCC source file
3327 * GDB pretty printers have been added for mutex and condition variable
3328 structures in POSIX Threads. When installed and loaded in gdb these pretty
3329 printers show various pthread variables in human-readable form when read
3330 using the 'print' or 'display' commands in gdb.
3332 * Tunables feature added to allow tweaking of the runtime for an application
3333 program. This feature can be enabled with the '--enable-tunables' configure
3334 flag. The GNU C Library manual has details on usage and README.tunables has
3335 instructions on adding new tunables to the library.
3337 * A new version of condition variables functions have been implemented in
3338 the NPTL implementation of POSIX Threads to provide stronger ordering
3341 * A new version of pthread_rwlock functions have been implemented to use a more
3342 scalable algorithm primarily through not using a critical section anymore to
3345 Security related changes:
3347 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3348 have been created with makecontext could fail to terminate due to a
3349 missing .cantunwind annotation. This has been observed to lead to a hang
3350 (denial of service) in some Go applications compiled with gccgo. Reported
3351 by Andreas Schwab. (CVE-2016-6323)
3353 * The DNS stub resolver functions would crash due to a NULL pointer
3354 dereference when processing a query with a valid DNS question type which
3355 was used internally in the implementation. The stub resolver now uses a
3356 question type which is outside the range of valid question type values.
3359 The following bugs are resolved with this release:
3361 [4099] stdio: Overly aggressive caching by stream i/o functions.
3362 [7065] build: Support building glibc with -fstack-protector or -fstack-
3364 [9842] localedata: en_CA: incorrect date format
3365 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3366 before it started waiting
3367 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3368 [15765] nptl: sem_open is wrongly a cancellation point
3369 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3370 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3372 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3373 library linked with pthread
3374 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3375 "FIXME: Ingo" issue)
3376 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3377 [17252] libc: getrandom and getentropy syscall
3378 [17730] malloc: thread-local storage is sometimes improperly free()'d
3379 after being __libc_memalign()'d
3380 [18241] stdio: failed fseek on memstream does not set errno and can fail
3382 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3384 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3385 PTHREAD_PRIO_INHERIT mutex on ARM
3386 [18784] network: res_query and related function crash for special record
3387 type queries (CVE-2015-5180)
3388 [19380] math: strtod does not raise "inexact"
3389 [19387] string: Integer overflow in memchr
3390 [19390] string: Integer overflow in strncat
3391 [19398] build: linknamespace tests fail with massively parallel build
3392 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3394 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3395 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3396 [19514] libc: [PATCH] Fix spelling errors in spelling
3397 "implement"/"implementation" in several places
3398 [19582] network: Deprecate RES_USE_INET6
3399 [19673] manual: clog10 docs appear to be erroneous
3400 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3401 causes a segmentation fault
3402 [19826] libc: invalid pointer returned from __tls_get_addr with static
3404 [20016] network: resolv: Remove hooks support from the API
3405 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3407 [20033] math: [x86_64] vectorized math function don't call the __finite
3409 [20116] nptl: use after free in pthread_create
3410 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3411 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3413 [20311] nptl: please install proc_service.h
3414 [20366] libc: Compilation errors in installed headers in strict-compliance
3416 [20370] malloc: malloc: Arena free list management is still racy
3417 (incorrect fix in bug 19243)
3418 [20386] libc: assert (X = 0) does not result in GCC warning
3419 [20432] malloc: malloc: Minimize interface required for interposition
3420 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3421 in _Unwind_Backtrace (CVE-2016-6323)
3422 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3423 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3425 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3426 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3427 [20477] network: resolv: incorrect double-checked locking related to
3429 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3431 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3433 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3434 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3435 cause transition penalty
3436 [20517] math: sparcv9 missing fdiml compat symbol
3437 [20524] manual: strverscmp is inconsistent
3438 [20525] libc: <sys/quota.h> should be based on kernel headers
3439 [20539] math: GCC 7 -static -lm fails to link at -O3
3440 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3442 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3444 [20591] network: Remove obsolete DNSSEC support
3445 [20592] network: DNS resource record type classification macros in
3446 <arpa/nameser.h> are incorrect
3447 [20593] network: Update DNS RR type definitions
3448 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3449 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3451 [20629] network: libresolv: Remove support for bitstring labels
3453 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3454 assertion: "maxidx >= 2"
3455 [20660] math: [arm] Use VSQRT
3456 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3457 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3458 [20689] libc: Test for FMA should also check for AVX.
3459 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3460 [20715] math: iszero macro breaks existing code
3461 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3462 [20728] libc: powerpc: Missing TOC stub in clone
3463 [20729] build: glibc-2.24 fails to build for i486 with -Os
3464 [20750] build: Build fails with default PIE enabled gcc-6.x
3465 [20768] math: [alpha] sqrt fegetenv namespace
3466 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3468 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3469 __FLT_EVAL_METHOD__ is 2
3470 [20790] network: rpcgen buffer overrun in get_prog_declaration
3471 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3472 [20829] libc: crypt snprintf namespace
3473 [20847] libc: tst-vfork3 failure
3474 [20855] math: Default bits/mathdef.h has inappropriate float_t
3475 [20859] math: [sh4] FP_ILOGB0 invalid
3476 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3477 U+20AC), not same as GBK
3478 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3479 [20916] math: pow handling of sNaN arguments
3480 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3481 [20919] math: Bad pow (qNaN, 0) result with -lieee
3482 [20940] math: hypot sNaN handling
3483 [20947] math: fmax, fmin sNaN handling
3484 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3485 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3487 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3488 [20973] nptl: robust mutexes: Lost wake-ups
3489 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3490 [20978] nis: strlen on null pointer in nss_nisplus
3491 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3493 [21014] string: i686 memchr overflows internal pointer check
3494 [21019] libc: [mips] n32 lseek incorrect on overflow
3495 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3496 [21026] libc: [MIPS] readahead syscall is broken on n64
3497 [21028] math: Fallback fesetexceptflag should always succeed
3498 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3499 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3501 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3502 [21061] librt: [microblaze] librt lost clock_* exports
3503 [21073] libc: tunables: insecure environment variables passed to
3504 subprocesses with AT_SECURE
3505 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3509 * The minimum Linux kernel version that this version of the GNU C Library
3510 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3511 kernel version 2.6.32 or later suffices (on architectures that already
3512 required kernel versions more recent than 3.2, those requirements remain
3513 unchanged). Linux 3.2 or later kernel headers are required on all
3516 * The pap_AN locale has been deleted. This has been deprecated for a long
3517 time. It has been replaced by pap_AW & pap_CW, both of which have long
3518 been included in previous releases.
3520 * The readdir_r and readdir64_r functions have been deprecated. It is
3521 recommended to use readdir and readdir64 instead.
3523 * The type “union wait” has been removed. It was deprecated in the early
3524 1990s and never part of POSIX. Application code should use the int type
3525 instead of “union wait”.
3527 * A new NSS action is added to facilitate large distributed system
3528 administration. The action, MERGE, allows remote user stores like LDAP
3529 to be merged into local user stores like /etc/groups in order to provide
3530 easy to use, updated, and managed sets of merged credentials. The new
3531 action can be used by configuring it in /etc/nsswitch.conf:
3532 group: files [SUCCESS=merge] nis
3533 Implemented by Stephen Gallagher (Red Hat).
3535 * The deprecated __malloc_initialize_hook variable has been removed from the
3538 * The long unused localedef --old-style option has been removed. It hasn't
3539 done anything in over 16 years. Scripts using this option can safely
3542 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3543 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3544 return the next representable value in the direction of positive infinity
3545 and the nextdown functions return the next representable value in the
3546 direction of negative infinity. These are currently enabled as GNU
3549 Security related changes:
3551 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3552 could result in a stack overflow when getnetbyname was called with an
3553 overly long name. (CVE-2016-3075)
3555 * Previously, getaddrinfo copied large amounts of address data to the stack,
3556 even after the fix for CVE-2013-4458 has been applied, potentially
3557 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3558 instead. Reported by Michael Petlan. (CVE-2016-3706)
3560 * The glob function suffered from a stack-based buffer overflow when it was
3561 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3562 Reported by Alexander Cherepanov. (CVE-2016-1234)
3564 * The Sun RPC UDP client could exhaust all available stack space when
3565 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3566 alloca plugin for GCC. (CVE-2016-4429)
3568 * The IPv6 name server management code in libresolv could result in a memory
3569 leak for each thread which is created, performs a failing naming lookup,
3570 and exits. Over time, this could result in a denial of service due to
3571 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3573 The following bugs are resolved with this release:
3575 [1170] localedata: ne_NP: update Nepali locale definition file
3576 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3578 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3579 [6796] math: fdim() does not set errno on overflow
3580 [10354] libc: posix_spawn should use vfork() in more cases than presently
3581 [11213] localedata: localedata: add copyright disclaimer to locale files
3582 [12143] localedata: chr_US: new Cherokee locale
3583 [12450] localedata: sgs_LT: new locale
3584 [12676] localedata: ln_CD: new locale
3585 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3587 [13304] math: fma, fmaf, fmal produce wrong results
3588 [14259] build: --localedir arg to configure is ignored
3589 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3590 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3591 [14934] localedata: es_CL: wrong first weekday chilean locale
3592 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3594 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3596 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3597 [15368] nptl: raise() is not async-signal-safe
3598 [15479] math: ceil, floor, round and trunc raise inexact exception
3599 [15578] localedata: kk_KZ: various updates
3600 [16003] localedata: pap_AN: punt old locale
3601 [16137] localedata: iw_IL: punt old locale
3602 [16190] localedata: eo: new esperanto locale
3603 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3604 [16742] malloc: race condition: pthread_atfork() called before first
3605 malloc() results in unexpected locking behaviour/deadlocks
3606 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3608 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3609 [17565] localedata: pt_PT: wrong (work-)week start
3610 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3611 [17950] build: Build fails with -msse
3612 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3613 [18433] libc: posix_spawn does not return correctly upon failure to
3615 [18453] localedata: charmaps/IBM875: incorrect codes
3616 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3618 [18896] localedata: he_IL: improvements for currency
3619 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3620 Romanian locale data
3621 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3623 [19056] libc: Deprecate readdir_r
3624 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3626 [19198] localedata: nl_NL: small improvements for Dutch locales
3627 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3628 nameservers (CVE-2016-5417)
3629 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3631 [19400] locale: Language missing in "iso-639.def", trivial fix in
3633 [19431] malloc: Deadlock between fflush, getdelim, and fork
3634 [19505] libc: Incorrect file descriptor validity checks in
3635 posix_spawn_file_actions_add{open,close,dup2}
3636 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3637 when using RTLD_NEXT
3638 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3639 `intl/{gettextP,loadinfo}.h'
3640 [19534] libc: execle, execlp may use malloc
3641 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3642 [19573] network: res_nclose and __res_maybe_init disagree about name
3643 server initialization, breaking Hesiod
3644 [19575] localedata: Status of GB18030 tables
3645 [19581] localedata: sr_* date_fmt string contains additional newline
3646 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3648 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3649 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3650 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3651 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3653 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3655 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3657 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3658 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3659 [19633] locale: strfmon_l applies global locale to number formatting
3660 [19642] network: Memory leak in getnameinfo
3661 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3662 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3664 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3665 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3667 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3668 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3670 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3672 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3674 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3675 pointers and lengths in error-case.
3676 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3677 report errors on UTF-16 surrogates values.
3678 [19755] nscd: nscd assertion failure in gc
3679 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3680 [19759] libc: mempcpy shouldn't be inlined
3681 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3682 [19765] libc: s390 needs an optimized mempcpy
3683 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3684 NAME_MAX limit assumption (CVE-2016-1234)
3685 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3686 [19787] network: Missing and incorrect truncation checks in getnameinfo
3687 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3689 [19791] network: Assertion failure in res_query.c with un-connectable name
3691 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3692 [19822] math: libm.so install clobbers old version
3693 [19825] network: resolv: send_vc can return uninitialized data in second
3694 response to getaddrinfo
3695 [19830] network: nss_dns: should check RDATA length against buffer length
3696 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3697 confronted with A/AAAA records of invalid size
3698 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3699 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3700 [19853] stdio: Printing IBM long double in decimal with high precision is
3702 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3703 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3704 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3706 [19865] network: Assertion failure or memory leak in
3707 _nss_dns_getcanonname_r
3708 [19868] network: nss_dns: netent code does not skip over non-PTR records
3709 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3711 [19881] string: Improve x86-64 memset
3712 [19907] string: Incorrect memcpy tests
3713 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3715 [19925] libc: termios.h XCASE namespace
3716 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3717 [19929] libc: limits.h NL_NMAX namespace
3718 [19931] stdio: Memory leak in vfprintf
3719 [19957] libc: clone(CLONE_VM) access invalid parent memory
3720 [19963] localedata: en_IL: New locale
3721 [19989] stdio: stdio.h cuserid namespace
3722 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3724 [19996] locale: langinfo.h nl_langinfo_l namespace
3725 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3726 [20010] network: getaddrinfo: Stack overflow in hostent translation
3728 [20012] stdio: libio: fmemopen append mode failure
3729 [20014] stdio: stdio.h namespace for pre-threads POSIX
3730 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3731 [20023] libc: fcntl.h timespec namespace
3732 [20024] math: [x86_64] vectorized sincos trashes the stack
3733 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3734 [20041] time: sys/time.h timespec namespace
3735 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3736 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3737 [20051] libc: ttyslot in wrong header under wrong conditions
3738 [20054] libc: gethostname not declared for XPG4
3739 [20055] libc: termios.h missing tcgetsid for XPG4
3740 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3742 [20073] libc: sys/stat.h fchmod namespace
3743 [20074] libc: stdlib.h rand_r namespace
3744 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3745 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3747 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3748 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3750 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3751 [20119] libc: Wrong mask for processors level type from CPUID
3752 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3753 AS not supporting AVX512
3754 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3756 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3757 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3759 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3760 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3761 [20178] libc: posix_spawn{p} should not call exit
3762 [20191] stdio: libio: vtables hardening
3763 [20195] string: FMA4 detection requires CPUID execution with register
3765 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3766 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3768 [20212] math: acos (sNaN) returns sNaN
3769 [20213] math: asin (sNaN) returns sNaN
3770 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3771 [20218] math: [i386] asinhl (sNaN) returns sNaN
3772 [20219] math: [i386] atanhl (sNaN) returns sNaN
3773 [20222] stdio: fopencookie: Mangle function pointers
3774 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3775 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3776 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3778 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3779 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3780 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3781 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3782 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3783 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3784 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3785 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3786 [20240] math: modf (sNaN) returns sNaN
3787 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3788 [20250] math: frexp (sNaN) returns sNaN
3789 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3790 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3792 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3793 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3794 subscript is below array bounds [-Werror=array-bounds]
3795 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3796 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3798 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3799 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3801 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3802 "invalid" exceptions
3803 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3804 [20316] localedata: id_ID: Februari instead of Pebruari
3805 [20327] string: POWER8 strcasecmp returns incorrect result
3806 [20347] math: Failure: Test: j0_downward (0xap+0)
3807 [20348] libc: FAIL: misc/tst-preadvwritev64
3808 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3809 [20350] libc: There is no test for p{read,write}64
3810 [20357] math: Incorrect cos result for 1.5174239687223976
3811 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3815 * Unicode 8.0.0 Support: Character encoding, character type info, and
3816 transliteration tables are all updated to Unicode 8.0.0, using new
3817 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3818 These updates cause user visible changes, such as the fixes for bugs
3819 89, 16061, and 18568.
3821 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3822 kernel-internal CPU set size. This means that requests that change the
3823 CPU affinity which failed before (for example, an all-ones CPU mask) will
3824 now succeed. Applications that need to determine the effective CPU
3825 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3826 setting it because the kernel can adjust it (and the previous size check
3827 would not detect this in the majority of cases).
3829 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3830 the following new symbols are used: fts64_children, fts64_close,
3831 fts64_open, fts64_read and fts64_set.
3833 * getaddrinfo now detects certain invalid responses on an internal netlink
3834 socket. If such responses are received, an affected process will
3835 terminate with an error message of "Unexpected error <number> on netlink
3836 descriptor <number>" or "Unexpected netlink response of size <number> on
3837 descriptor <number>". The most likely cause for these errors is a
3838 multi-threaded application which erroneously closes and reuses the netlink
3839 file descriptor while it is used by getaddrinfo.
3841 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3842 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3843 unnecessary serialization of memory allocation requests across threads.
3844 The defect is now corrected. Users should see a substantial increase in
3845 the concurent throughput of allocation requests for applications which
3846 trigger this bug. Affected applications typically create and
3847 destroy threads frequently. (Bug 19048 was reported and analyzed by
3850 * There is now a --disable-timezone-tools configure option for disabling the
3851 building and installing of the timezone related utilities (zic, zdump, and
3852 tzselect). This is useful for people who build the timezone data and code
3853 independent of the GNU C Library.
3855 * The obsolete header <regexp.h> has been removed. Programs that require
3856 this header must be updated to use <regex.h> instead.
3858 * The obsolete functions bdflush, create_module, get_kernel_syms,
3859 query_module and uselib are no longer available to newly linked binaries;
3860 the header <sys/kdaemon.h> has been removed. These functions and header
3861 were specific to systems using the Linux kernel and could not usefully be
3862 used with the GNU C Library on systems with version 2.6 or later of the
3865 * Optimized string, wcsmbs and memory functions for IBM z13.
3866 Implemented by Stefan Liebler.
3868 * Newly linked programs that define a variable called signgam will no longer
3869 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3870 require signgam to be set by those functions must ensure that they use the
3871 variable provided by the GNU C Library and declared in <math.h>, without
3872 defining their own copy.
3874 * The minimum GCC version that can be used to build this version of the GNU
3875 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3876 still be used to compile programs using the GNU C Library.
3878 Security related changes:
3880 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3881 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3883 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3884 the pointer guard feature. It is always enabled. Previously,
3885 LD_POINTER_GUARD could be used to disable security hardening in binaries
3886 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3889 * An integer overflow in hcreate and hcreate_r could lead to an
3890 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3892 * The catopen function no longer has unbounded stack usage. Reported by
3893 Max. (CVE-2015-8779)
3895 * The nan, nanf and nanl functions no longer have unbounded stack usage
3896 depending on the length of the string passed as an argument to the
3897 functions. Reported by Joseph Myers. (CVE-2014-9761)
3899 * A stack-based buffer overflow was found in libresolv when invoked from
3900 libnss_dns, allowing specially crafted DNS responses to seize control
3901 of execution flow in the DNS client. The buffer overflow occurs in
3902 the functions send_dg (send datagram) and send_vc (send TCP) for the
3903 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3904 family. The use of AF_UNSPEC triggers the low-level resolver code to
3905 send out two parallel queries for A and AAAA. A mismanagement of the
3906 buffers used for those queries could result in the response of a query
3907 writing beyond the alloca allocated buffer created by
3908 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3909 the overflow. Thanks to the Google Security Team and Red Hat for
3910 reporting the security impact of this issue, and Robert Holiday of
3911 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3913 The following bugs are resolved with this release:
3915 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3916 [887] math: Math library function "logb" and "nextafter" inconsistent
3917 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3918 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3919 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3920 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3922 [4404] localedata: German translation of "Alarm clock" is misleading
3923 [6799] math: nextafter() and nexttoward() doen't set errno on
3924 overflow/underflow errors
3925 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3927 [10432] nis: _nss_nis_setnetgrent assertion failure
3928 [11460] libc: fts has no LFS support
3929 [12926] network: getaddrinfo()/make_request() may spin forever
3930 [13065] nptl: Race condition in pthread barriers
3931 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3932 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3934 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3935 [14912] libc: Rename non-installed bits/*.h headers
3936 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3937 [15367] math: Let gcc use __builtin_isinf
3938 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3939 [15421] math: lgamma wrongly sets signgam for ISO C
3940 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3941 FE_INVALID with argument out of range
3942 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3944 [15786] dynamic-link: ifunc resolver functions can smash function
3946 [15918] math: Unnecessary check for equality in hypotf()
3947 [16061] localedata: Review / update transliteration data
3948 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3950 [16141] time: strptime %z offset restriction
3951 [16171] math: drem should be alias of remainder
3952 [16296] math: fegetround is pure?
3953 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3954 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3956 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3957 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3959 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3960 "Exception "Inexact" set" on ppc32
3961 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3962 [16517] math: Missing underflow exception from tanf/tan/tanl
3963 [16519] math: Missing underflow exception from sinhf
3964 [16520] math: Missing underflow exception from tanhf
3965 [16521] math: Missing underflow exception from exp2
3966 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3968 [16734] stdio: fopen calls mmap to allocate its buffer
3969 [16961] math: nan function incorrect handling of bad sequences
3970 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3971 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3972 [16985] locale: localedef: confusing error message when opening output
3974 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3975 [17197] locale: Redundant shift character in iconv conversion output at
3977 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3978 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3979 [17250] dynamic-link: static linking breaks nss loading
3980 (getaddrinfo/getpwnam/etc...)
3981 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3983 [17441] math: isnan() should use __builtin_isnan() in GCC
3984 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3985 (related to lock elision)
3986 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3987 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3988 [17887] time: strptime should be able to parse "+01:00" style timezones
3989 [17905] libc: catopen() Multiple unbounded stack allocations
3991 [18084] libc: backtrace (..., 0) dumps core on x86
3992 [18086] libc: nice() sets errno to 0 on success
3993 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3994 is too large (CVE-2015-8778)
3995 [18251] dynamic-link: SONAME missing when audit modules provides path
3996 [18265] libc: add attributes for wchar string and memory functions
3997 [18370] math: csqrt missing underflows
3998 [18421] libc: [hppa] read-only segment has dynamic relocations
3999 [18472] libc: Obsolete syscall wrappers should be compat symbols
4000 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4001 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4002 [18525] localedata: Remove locale timezone information
4003 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4004 [18568] localedata: Update locale data to Unicode 8.0
4005 [18589] locale: sort-test.sh fails at random
4006 [18595] math: ctan, ctanh missing underflows
4007 [18604] libc: assert macro-expands its argument
4008 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4009 contains a vector instruction exception.
4010 [18611] math: j1, jn missing errno setting on underflow
4011 [18618] localedata: sync Chechen locale definitions with other *_RU
4013 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4014 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4015 [18665] network: In send_dg, the recvfrom function is NOT always using the
4016 buffer size of a newly created buffer (CVE-2015-7547)
4017 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4019 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4021 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4022 [18699] math: tilegx cproj() for various complex infinities does not yield
4024 [18724] libc: Harden put*ent functions against data injection
4025 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4026 [18755] build: build errors with -DNDEBUG
4027 [18757] stdio: fmemopen fails to set errno on failure
4028 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4030 [18781] libc: openat64 lacks O_LARGEFILE
4031 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4032 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4033 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4034 [18790] math: [ldbl-128ibm] tanhl inaccurate
4035 [18795] libc: stpncpy fortification misses buffer lengths that are
4036 statically too large
4037 [18796] build: build fails for --disable-mathvec
4038 [18803] math: hypot missing underflows
4039 [18820] stdio: fmemopen may leak memory on failure
4040 [18823] math: csqrt spurious underflows
4041 [18824] math: fma spurious underflows
4042 [18825] math: pow missing underflows
4043 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4044 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4045 [18870] build: sem_open.c fails to compile with missing symbol
4047 [18872] stdio: Fix memory leak in printf_positional
4048 [18873] libc: posix_fallocate overflow check ineffective
4049 [18875] math: Excess precision leads incorrect libm
4050 [18877] libc: arm: mmap offset regression
4051 [18887] libc: memory corruption when using getmntent on blank lines
4052 [18918] localedata: hu_HU: change time to HH:MM:SS format
4053 [18921] libc: Regression: extraneous stat() and fstat() performed by
4055 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4056 binaries (CVE-2015-8777)
4057 [18951] math: tgamma missing underflows
4058 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4060 [18953] localedata: lt_LT: change currency symbol to the euro
4061 [18956] math: powf inaccuracy
4062 [18961] math: [i386] exp missing underflows
4063 [18966] math: [i386] exp10 missing underflows
4064 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4065 [18969] build: multiple string test failures due to missing locale
4067 [18970] libc: Reference of pthread_setcancelstate in libc.a
4068 [18977] math: float / long double Bessel functions not in XSI POSIX
4069 [18980] math: i386 libm functions return with excess range and precision
4070 [18981] math: i386 scalb*, ldexp return with excess range and precision
4071 [18982] stdio: va_list and vprintf
4072 [18985] time: Passing out of range data to strftime() causes a segfault
4074 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4075 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4076 [19012] locale: iconv_open leaks memory on error path
4077 [19016] math: clog, clog10 inaccuracy
4078 [19018] nptl: Mangle function pointers in tls_dtor_list
4079 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4080 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4081 [19048] malloc: malloc: arena free list can become cyclic, increasing
4083 [19049] math: [powerpc] erfc incorrect zero sign
4084 [19050] math: [powerpc] log* incorrect zero sign
4085 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4086 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4087 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4088 [19074] network: Data race in _res_hconf_reorder_addrs
4089 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4090 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4091 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4093 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4095 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4096 [19086] manual: posix_fallocate64 documented argument order is wrong.
4097 [19088] math: lround, llround missing exceptions close to overflow
4099 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4100 [19095] math: dbl-64 lrint incorrect for 64-bit long
4101 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4102 [19124] dynamic-link: ld.so failed to build with older assmebler
4103 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4104 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4105 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4106 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4107 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4108 pthread_setaffinity_np
4109 [19156] math: [ldbl-128] j0l spurious underflows
4110 [19164] nptl: tst-getcpu fails with many possible CPUs
4111 [19168] math: math/test-ildoubl and math/test-ldouble failure
4112 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4113 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4115 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4116 (FE_NOMASK_ENV) do not clear SSE exceptions
4117 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4118 _int_new_arena/reused_arena
4119 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4120 [19201] math: dbl-64 remainder incorrect sign of zero result
4121 [19205] math: bits/math-finite.h conditions do not match math.h and
4123 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4124 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4125 for C99-based standards
4126 [19212] libc: features.h not -Wundef clean
4127 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4129 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4130 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4131 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4133 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4134 "inexact" exceptions
4135 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4137 [19242] libc: strtol incorrect in Turkish locales
4138 [19243] malloc: reused_arena can pick an arena on the free list, leading
4139 to an assertion failure and reference count corruption
4140 [19253] time: tzset() ineffective when temporary TZ did not include DST
4142 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4143 [19270] math: [hppa] Shared libm missing __isnanl
4144 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4145 MAP_HUGETLB and MAP_STACK defines
4146 [19313] nptl: Wrong __cpu_mask for x32
4147 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4148 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4149 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4150 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4151 [19363] time: x32: times() return value wrongly truncates/sign extends
4153 [19367] dynamic-link: Improve branch prediction on Silvermont
4154 [19369] network: Default domain name not reset by res_ninit when "search"
4155 / "domain" entry is removed from resolv.conf
4156 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4158 [19385] localedata: bg_BG: time separator should be colon, not comma
4159 [19408] libc: linux personality syscall wrapper may erroneously return an
4160 error on 32-bit architectures
4161 [19415] libc: dladdr returns wrong names on hppa
4162 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4163 IBM905, IBM907, and IBM909
4164 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4165 [19443] build: build failures with -DDEBUG
4166 [19451] build: Make check fails on test-double-vlen2
4167 [19462] libc: Glibc failed to build with -Os
4168 [19465] math: Wrong code with -Os
4169 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4171 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4173 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4174 [19486] math: S390: Math tests fail with "Exception Inexact set".
4175 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4176 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4178 [19590] math: Fail to build shared objects that use libmvec.so functions.
4182 * The following bugs are resolved with this release:
4184 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4185 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4186 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4187 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4188 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4189 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4190 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4191 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4192 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4193 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4194 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4195 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4196 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4197 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4198 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4199 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4200 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4201 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4202 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4203 18657, 18676, 18694, 18696, 18887.
4205 * Cache information can be queried via sysconf() function on s390 e.g. with
4206 _SC_LEVEL1_ICACHE_SIZE as argument.
4208 * A buffer overflow in gethostbyname_r and related functions performing DNS
4209 requests has been fixed. If the NSS functions were called with a
4210 misaligned buffer, the buffer length change due to pointer alignment was
4211 not taken into account. This could result in application crashes or,
4212 potentially arbitrary code execution, using crafted, but syntactically
4213 valid DNS responses. (CVE-2015-1781)
4215 * The time zone file parser has been made more robust against crafted time
4216 zone files, avoiding heap buffer overflows related to the processing of
4217 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4218 large time zone data files. Overly long time zone specifiers in the TZ
4219 variable no longer result in stack overflows and crashes.
4221 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4222 for LD and GD on x86 and x86-64, has been implemented. You will need
4223 binutils-2.24 or later to enable this optimization.
4225 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4226 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4227 Hat). These updates cause user visible changes, such as the fix for bug
4230 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4231 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4232 condition in some applications.
4234 * Added vector math library named libmvec with the following vectorized x86_64
4235 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4237 The library can be disabled with --disable-mathvec. Use of the functions is
4238 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4239 Shared library libmvec.so is linked in as needed when using -lm (no need to
4240 specify -lmvec explicitly for not static builds).
4241 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4243 * A new fmemopen implementation has been added with the goal of POSIX
4244 compliance. The new implementation fixes the following long-standing
4245 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4246 old implementation is still present for use be by existing binaries.
4248 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4249 releases. It has been fixed to match 2.19 and older, but binaries built
4250 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4252 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4253 Contributed by Roland McGrath (Google).
4255 * The header <regexp.h> is deprecated, and will be removed in a future
4256 release. Use of this header will trigger a deprecation warning.
4257 Application developers should update their code to use <regex.h> instead.
4259 This header was formerly part of SUS, but was deprecated in 1994 and
4260 removed from the standard in 2001. Also, the glibc implementation
4261 leaks memory. See BZ#18681 for more details.
4265 * The following bugs are resolved with this release:
4267 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4268 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4269 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4270 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4271 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4272 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4273 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4274 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4275 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4276 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4279 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4280 too little memory for the to-be-scanned arguments and overflow the
4281 allocated buffer. The implementation now correctly computes the required
4282 buffer size when using malloc, and switches to malloc from alloca as
4285 * A new semaphore algorithm has been implemented in generic C code for all
4286 machines. Previous custom assembly implementations of semaphore were
4287 difficult to reason about or ensure that they were safe. The new version
4288 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4289 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4290 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4292 * Port to Altera Nios II has been contributed by Mentor Graphics.
4294 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4295 implementations for powerpc64/powerpc64le.
4296 Implemented by Adhemerval Zanella (IBM).
4298 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4299 and powerpc64le. This may improve lock scaling of existing programs on
4300 HTM capable systems. The lock elision code is only enabled with
4301 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4302 powerpc will issue a transaction abort on every syscall to avoid side
4303 effects being visible outside transactions.
4305 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4306 AArch64. Contributed by ARM Ltd.
4308 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4310 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4311 under certain input conditions resulting in the execution of a shell for
4312 command substitution when the application did not request it. The
4313 implementation now checks WRDE_NOCMD immediately before executing the
4314 shell and returns the error WRDE_CMDSUB as expected.
4316 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4317 processing format strings with a large number of format specifiers.
4319 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4320 infinite loop if the DNS response contained a PTR record of an unexpected
4323 * The minimum GCC version that can be used to build this version of the GNU
4324 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4325 still be used to compile programs using the GNU C Library.
4327 * The GNU C Library is now built with -Werror by default. This can be
4328 disabled by configuring with --disable-werror.
4330 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4332 * The obsolete sigvec function has been removed. This was the original
4333 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4334 programs have been using instead for about 25 years. Of course, ABI
4335 compatibility for old binaries using sigvec remains intact.
4337 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4338 with newer versions of bison.
4340 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4341 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4342 registers overlay two consecutive single-precision registers. MIPS32R2
4343 introduced a new FPU mode (FR=1) where double-precision registers extend the
4344 corresponding single-precision registers which is incompatible with the
4345 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4346 require the use of FR=1 making a transition necessary. New o32 ABI
4347 extensions enable users to migrate over time from the original o32 ABI
4348 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4349 tracks the ABI of any loaded object and verifies that new objects are
4350 compatible. Mode transitions will also be requested as required and
4351 unsupportable objects will be rejected. The ABI checks include both soft and
4352 hard float ABIs for o32, n32 and n64.
4354 GCC 5 with GNU binutils 2.25 onwards:
4355 It is strongly recommended that all o32 system libraries are built using the
4356 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4357 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4358 compiler using --with-fp-32=xx to set this by default.
4362 * The following bugs are resolved with this release:
4364 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4365 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4366 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4367 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4368 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4369 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4370 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4371 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4372 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4373 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4374 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4375 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4376 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4377 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4378 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4380 * Reverted change of ABI data structures for s390 and s390x:
4381 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4382 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4383 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4384 are preserved pointing straight to the same implementation as the old ones.
4385 Given that, new callers will simply provide a too-big buffer to these
4386 functions. Any applications/libraries out there that embed jmp_buf or
4387 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4388 against 2.19 headers will have to rebuilt again. This is necessary in any
4389 case to revert the breakage in their ABI caused by the glibc change.
4391 * Support for file description locks is added to systems running the
4392 Linux kernel. The standard file locking interfaces are extended to
4393 operate on file descriptions, not file descriptors, via the use of
4394 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4395 are associated with an open file instead of a process.
4397 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4399 * The minimum Linux kernel version that this version of the GNU C Library
4400 can be used with is 2.6.32.
4402 * Running the testsuite no longer terminates as soon as a test fails.
4403 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4404 with PASS or FAIL lines for individual tests. A summary of the results is
4405 printed, including a list of failing lists, and "make check" exits with
4406 error status if there were any unexpected failures. "make check
4407 stop-on-test-failure=y" may be used to keep the old behavior.
4409 * The am33 port, which had not worked for several years, has been removed
4412 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4413 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4414 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4415 conflicted with POSIX (support for which was removed in 2.19), the
4416 interfaces those macros enabled remain available when compiling with
4417 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4418 test macros defined.
4420 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4422 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4423 This may improve lock scaling of existing programs on TX capable systems.
4424 The lock elision code is only built with --enable-lock-elision=yes and
4425 then requires a GCC version supporting the TX builtins. With lock elision
4426 default mutexes are elided via __builtin_tbegin, if the cpu supports
4427 transactions. By default lock elision is not enabled and the elision code
4430 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4431 copy the path argument. This allowed programs to cause posix_spawn to
4432 deference a dangling pointer, or use an unexpected pathname argument if
4433 the string was modified after the posix_spawn_file_actions_addopen
4436 * All supported architectures now use the main glibc sysdeps directory
4437 instead of some being in a separate "ports" directory (which was
4438 distributed separately before glibc 2.17).
4440 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4441 On configurations that support it (all Linux configurations), it's now
4442 used regardless of the --enable-add-ons switch to configure. It is no
4443 longer possible to build such configurations without pthreads support.
4445 * Locale names, including those obtained from environment variables (LANG
4446 and the LC_* variables), are more tightly checked for proper syntax.
4447 setlocale will now fail (with EINVAL) for locale names that are overly
4448 long, contain slashes without starting with a slash, or contain ".." path
4449 components. (CVE-2014-0475) Previously, some valid locale names were
4450 silently replaced with the "C" locale when running in AT_SECURE mode
4451 (e.g., in a SUID program). This is no longer necessary because of the
4454 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4455 with application code using Intel MPX instructions. (With all previous
4456 versions, the MPX register state could be clobbered when making calls
4457 into or out of a shared library.) Note that while the new dynamic
4458 linker is compatible with all known x86 hardware whether or not it
4459 supports Intel MPX, some x86 instruction-set emulators might fail to
4460 handle the new instruction encodings. This is known to affect Valgrind
4461 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4462 release), and might affect other tools that do instruction emulation.
4464 * Support for loadable gconv transliteration modules has been removed.
4465 The support for transliteration modules has been non-functional for
4466 over a decade, and the removal is prompted by security defects. The
4467 normal gconv conversion modules are still supported. Transliteration
4468 with //TRANSLIT is still possible, and the //IGNORE specifier
4469 continues to be supported. (CVE-2014-5119)
4471 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4472 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4473 resulting a denial-of-service security vulnerability in applications which
4474 use functions related to iconv. (CVE-2014-6040)
4478 * The following bugs are resolved with this release:
4480 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4481 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4482 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4483 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4484 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4485 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4486 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4487 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4488 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4489 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4490 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4491 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4492 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4493 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4494 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4495 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4496 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4497 16431, 16453, 16474, 16506, 16510, 16529
4499 * Slovenian translations for glibc messages have been contributed by the
4500 Translation Project's Slovenian team of translators.
4502 * The public headers no longer use __unused nor __block. This change is to
4503 support compiling programs that are derived from BSD sources and use
4504 __unused internally, and to support compiling with Clang's -fblock
4505 extension which uses __block.
4507 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4508 large collation sequences to optimize multiple passes. This cache
4509 computation may overflow for large collation sequences and may cause a
4510 stack or buffer overflow. This is now fixed to use a slower algorithm
4511 which does not use a cache if there is an integer overflow.
4513 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4514 rules for large collation sequences to optimize multiple passes and falls
4515 back to alloca if malloc fails, resulting in a possible stack overflow.
4516 The implementation now falls back to an uncached collation sequence lookup
4519 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4520 initialized for static applications resulting in the security feature
4521 being disabled. The pointer guard is now correctly initialized to a
4522 random value for static applications. Existing static applications need
4523 to be recompiled to take advantage of the fix (bug 15754).
4525 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4526 to the d_name member of struct dirent, or omit the terminating NUL
4527 character. (Bugzilla #14699).
4529 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4530 aligned_alloc functions could allocate too few bytes or corrupt the
4531 heap when passed very large allocation size values (Bugzilla #15855,
4534 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4535 for AF_INET6 has been fixed (Bugzilla #16072).
4537 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4538 pap_CW, quz_PE, the_NP.
4540 * Substantially revised locales: gd_GB, ht_HT
4542 * The LC_ADDRESS field was updated to support country_car for almost all
4545 * ISO 1427 definitions were updated.
4547 * ISO 3166 definitions were updated.
4549 * The localedef utility now supports --big-endian and --little-endian
4550 command-line options to generate locales for a different system from that
4551 for which the C library was built.
4553 * Binary locale files now only depend on the endianness of the system for
4554 which they are generated and not on other properties of that system. As a
4555 consequence, binary files generated with new localedef may be incompatible
4556 with old versions of the GNU C Library, and binary files generated with
4557 old localedef may be incompatible with this version of the GNU C Library,
4558 in the following circumstances:
4560 + Locale files may be incompatible on m68k systems.
4562 + Locale archive files (but not separate files for individual locales) may
4563 be incompatible on systems where plain "char" is signed.
4565 * The configure option --disable-versioning has been removed. Builds with
4566 --disable-versioning had not worked for several years.
4568 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4569 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4571 * SystemTap probes for malloc have been introduced.
4573 * SystemTap probes for slow multiple precision fallback paths of
4574 transcendental functions have been introduced.
4576 * Support for powerpc64le has been added.
4578 * The soft-float powerpc port now supports e500 processors.
4580 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4582 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4583 set of header declarations that are enabled by default, even when other
4584 feature test macros or compiler options such as -std=c99 would otherwise
4585 disable some of those declarations.
4587 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4588 conflict with POSIX. The libbsd-compat library (which was a dummy library
4589 that did nothing) has also been removed.
4591 * Preliminary documentation about Multi-Thread, Async-Signal and
4592 Async-Cancel Safety has been added.
4594 * Change of ABI data structures for s390 and s390x:
4595 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4596 allow for future hardware extensions. All library functions that accept or
4597 return these structures were versioned in order to provide backwards
4598 compatibility with existing code. However, not all cases can be handled
4599 with interface versioning. If an application embeds either structure into
4600 another structure and that structure is passed to another compilation unit
4601 which expects the newer larger-sized object then any access to the new
4602 fields will result in undefined behaviour. Similarly any access to fields
4603 that were moved by the enlarging of the structures will cause undefined
4604 behaviour. To fix the undefined behaviour all objects that are part of the
4605 final in-memory image must agree on the size of structures, and this may
4606 require recompilation.
4610 * The following bugs are resolved with this release:
4612 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4613 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4614 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4615 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4616 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4617 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4618 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4619 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4620 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4621 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4622 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4623 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4624 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4627 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4628 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4629 Distributions can re-enable building and using pt_chown via the new configure
4630 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4631 considerable security risks and should only be used if the distribution
4632 understands and accepts the risks.
4634 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4637 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4638 fixed (Bugzilla #15330).
4640 * Add support for calling C++11 thread_local object destructors on thread
4641 and program exit. This needs compiler support for offloading C++11
4642 destructor calls to glibc.
4644 * Improved worst case performance of libm functions with double inputs and
4647 * Support for priority inherited mutexes in pthread condition variables on
4648 non-x86 architectures.
4650 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4652 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4654 * Optimized string functions for ARM. Implemented by Will Newton and
4657 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4659 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4662 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4663 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4665 * Added a benchmark framework to track performance of functions in glibc.
4667 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4668 It is based on draft TS 18661 and currently enabled as a GNU extension.
4670 * On Linux, the clock function now uses the clock_gettime system call
4671 for improved precision, rather than old times system call.
4673 * Added support for version-3 tz format files. This is needed when using
4674 the tz database release 2013e or later, and affects a few unusual cases --
4675 currently only TZ='America/Godthab' for time stamps after 2037.
4677 * Added new API functions pthread_getattr_default_np and
4678 pthread_setattr_default_np to get and set the default pthread
4679 attributes of a process.
4681 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4682 This may improve lock scaling of existing programs on TSX capable systems.
4683 When the --enable-lock-elision=yes parameter is specified at configure
4684 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4687 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4688 availability). Implemented by Ryan S. Arnold.
4690 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4694 * The following bugs are resolved with this release:
4696 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4697 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4698 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4699 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4700 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4701 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4702 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4703 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4704 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4705 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4706 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4707 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4708 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4709 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4710 14879, 14889, 14893, 14898, 14914.
4712 * Optimization of memcpy for MIPS.
4714 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4715 EMFILE has been fixed (Bugzilla #14889).
4717 * The add-on ports collection is now distributed in the "ports" subdirectory
4718 of the main GNU C Library distribution, rather than separately.
4720 * Port to ARM AArch64 contributed by Linaro.
4722 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4723 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4725 Implemented by Andreas Krebbel.
4727 * The new function secure_getenv allows secure access to the environment,
4728 returning NULL if running in a SUID/SGID process. This function replaces
4729 the internal function __secure_getenv.
4731 * SystemTap static probes have been added into the dynamic linker.
4732 Implemented by Gary Benson.
4734 * Optimizations of string functions strstr, strcasestr and memmem.
4735 Implemented by Maxim Kuvyrkov.
4737 * The minimum Linux kernel version that this version of the GNU C Library
4738 can be used with is 2.6.16.
4740 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4741 powerpc POWER7. Implemented by Will Schmidt.
4743 * New configure option --disable-nscd builds the C library such that it
4744 never attempts to contact the Name Service Caching Daemon (nscd).
4745 New configure option --disable-build-nscd avoids building nscd itself;
4746 this is the default if --disable-nscd is used.
4748 * Improved support for cross-compilation, including cross-testing and
4749 bootstrap builds without a previously built glibc.
4751 * Several testsuite tests are now able to test multiple IFUNC variants of an
4752 interface, rather than just testing the one that would be chooen by
4755 * New configure options --with-bugurl and --with-pkgversion, for
4756 distributors to use to embed their bug-reporting and package version
4757 information in --help and --version output.
4759 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4760 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4761 allows creation of chroots without the procfs mounted on /proc.
4763 * The `crypt' function now fails if passed salt bytes that violate the
4764 specification for those values. On Linux, the `crypt' function will
4765 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4766 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4767 when the mode is enabled.
4769 * The `clock_*' suite of functions (declared in <time.h>) is now available
4770 directly in the main C library. Previously it was necessary to link with
4771 -lrt to use these functions. This change has the effect that a
4772 single-threaded program that uses a function such as `clock_gettime' (and
4773 is not linked with -lrt) will no longer implicitly load the pthreads
4774 library at runtime and so will not suffer the overheads associated with
4775 multi-thread support in other code such as the C++ runtime library.
4777 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4782 * The following bugs are resolved with this release:
4784 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4785 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4786 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4787 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4788 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4789 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4790 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4791 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4792 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4793 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4794 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4795 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4796 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4797 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4798 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4799 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4800 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4801 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4802 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4803 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4804 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4805 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4808 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4809 configuring glibc with:
4810 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4811 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4812 Implemented by H.J. Lu.
4816 + define static_assert
4818 + do not declare gets
4820 + declare at_quick_exit and quick_exit also for ISO C11
4822 + aligned_alloc. NB: The code is deliberately allows the size parameter
4823 to not be a multiple of the alignment. This is a moronic requirement
4824 in the standard but it is only a requirement on the caller, not the
4827 + timespec_get added
4829 + uchar.h support added
4831 + CMPLX, CMPLXF, CMPLXL added
4833 Implemented by Ulrich Drepper.
4835 * Support for the IA-64 has been moved to ports.
4837 * Remove support for anything but ELF binary format
4839 * Checking versions of poll, ppoll added.
4840 Implemented by Ulrich Drepper.
4842 * More generic and 64-bit performance optimizations to math functions.
4843 Implemented by Ulrich Drepper.
4845 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4846 headers and functions available at compile time as they were before
4847 version 2.14. This option will be removed at some time in the future
4848 after the TI-RPC library becomes fully sufficient for the needs of
4849 existing applications.
4851 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4852 Note that glibc is not expected to work with any Linux kernel version
4855 * New header <sys/auxv.h> and function getauxval allowing easy access to
4856 the AT_* key-value pairs passed from the Linux kernel. The header also
4857 defines the HWCAP_* bits associated with the AT_HWCAP key.
4859 * New locales: mag_IN
4861 * New configure option --enable-systemtap builds SystemTap static probes
4862 into libc for setjmp and longjmp and into libpthread for various operations.
4863 So far the setjmp/longjmp probes and some of the libpthread probes are
4864 provided only for i*86 and x86_64.
4865 Implemented by Roland McGrath and Rayson Ho.
4867 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4869 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4872 * More optimized functions for SPARC. Implemented by David S. Miller.
4874 * Improved support for cross-compilation, especially bootstrap builds
4875 without a previously built glibc.
4877 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4878 Chris Metcalf from Tilera.
4880 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4881 now supported for ARM processors.
4883 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4884 as the name of the dynamic linker, to distinguish it from the
4885 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4887 * Support for CRIS has been removed from ports.
4889 * A new class of installed header has been documented for low-level
4890 platform-specific functionality. PowerPC added the first instance with a
4891 function to provide time base register access. Contributed by Tulio
4892 Magno Quites Machado Filho.
4894 * ix86 configurations now install header files that are consistent with
4895 what x86-64 configurations install. These same header files can be used
4896 for -m32, -m64, or -mx32 builds.
4897 Contributed by H.J. Lu.
4899 * Math library bug fixes. A thorough audit of all open math library bugs was
4900 conducted by Joseph Myers. Significant progress was made on many math
4901 library bugs resulting in more accurate exceptions and function results.
4902 Many thanks to all those that contributed including Andreas Jaeger for his
4903 patch review and work on the x87 trigonometric instruction issues.
4905 * Timezone data is no longer installed. Timezone-related binaries and scripts
4906 will continue to be installed. Users should obtain their timezone data from
4907 their distribution provider or from the tzdata package at
4908 <ftp://munnari.oz.au/pub/>.
4912 * The following bugs are resolved with this release:
4914 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4915 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4916 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4917 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4918 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4919 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4920 13484, 13506, 13515, 13523, 13524, 13538, 13540
4922 * New program pldd to list loaded object of a process
4923 Implemented by Ulrich Drepper.
4925 * Add nss_db support back to glibc. No more dependency on Berkeley db
4926 and support for initgroups lookups.
4927 Implemented by Ulrich Drepper.
4929 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4930 Contributed by HJ Lu.
4932 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4933 Contributed by HJ Lu.
4935 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4936 on x86-32 and x86-64.
4937 Contributed by Liubov Dmitrieva.
4939 * Optimized strchr and strrchr for SSE on x86-32.
4940 Contributed by Liubov Dmitrieva.
4942 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4943 for x86-64 and x86-32.
4944 Contributed by Liubov Dmitrieva.
4946 * New interfaces: scandirat, scandirat64
4947 Implemented by Ulrich Drepper.
4949 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4950 Implemented by Ulrich Drepper.
4952 * nscd now also caches the netgroup database.
4953 Implemented by Ulrich Drepper.
4955 * Integrate libm with gcc's -ffinite-math-only option.
4956 Implemented by Ulrich Drepper.
4958 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4959 to math functions. Implemented by Ulrich Drepper.
4961 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4962 Implemented by Ulrich Drepper.
4964 * New Linux interfaces: process_vm_readv, process_vm_writev
4966 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4967 Implemented by Ulrich Drepper.
4969 * Optimized nearbyint and strcasecmp for PPC.
4970 Implemented by Adhemerval Zanella.
4972 * New locales: bho_IN, unm_US, es_CU, ta_LK
4976 * The following bugs are resolved with this release:
4978 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4979 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4980 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4981 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4982 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4983 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4984 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4985 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4986 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4987 12795, 12811, 12813, 12814, 12841
4989 * The RPC implementation in libc is obsoleted. Old programs keep working
4990 but new programs cannot be linked with the routines in libc anymore.
4991 Programs in need of RPC functionality must be linked against TI-RPC.
4992 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4994 Visible changes of this change include (obviously) the inability to link
4995 programs using RPC functions without referencing the TI-RPC library and the
4996 removal of the RPC headers from the glibc headers.
4997 Implemented by Ulrich Drepper.
4999 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5000 syncfs, setns, sendmmsg
5002 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5003 yue_HK, lij_IT, mhr_RU
5005 * New encodings: CP770, CP771, CP772, CP773, CP774
5007 * New program sotruss to trace calls through PLTs
5008 Implemented by Ulrich Drepper.
5010 * The malloc hook implementation is marked deprecated and will be removed
5011 from the default implementation in the next version. The design never
5012 worked ever since the introduction of threads. Even programs which do
5013 not create threads themselves can use multiple threads created internally.
5017 * The following bugs are resolved with this release:
5019 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5020 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5021 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5022 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5025 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5027 * POWER7 optimizations: memset, memcmp, strncmp
5029 * New optimized string functions for x86-64: strnlen (SSE2),
5030 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5031 Implemented by Ulrich Drepper.
5035 * The following bugs are resolved with this release:
5037 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5038 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5039 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5040 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5041 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5042 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5043 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5044 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5046 * New interfaces: pthread_getname_np, pthread_setname_np
5048 * New Linux interface: recvmmsg
5050 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5052 * The dynamic linker now recognizes supported ABI versions from the
5053 EI_ABIVERSION field in the ELF header.
5054 Implemented by Ulrich Drepper.
5056 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5057 will not be used to fill in password fields in the passwd.byname replies.
5058 Instead it is used to synthesize the shadow.byname table, should it be
5059 missing. This is a useful mode in some installations involving Solaris.
5060 Implemented by Ulrich Drepper.
5062 * New locales: kok_IN, sq_MK, cv_RU
5066 * The following bugs are resolved with this release:
5068 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5069 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5070 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5071 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5072 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5073 10789, 10817, 10823, 10840, 10847
5075 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5077 Implemented by Ulrich Drepper.
5079 * Checking version of longjmp added that fails if an uninitialized stack
5080 frame would be created. Implemented by Ulrich Drepper.
5082 * STT_GNU_IFUNC is now supported in static executables.
5083 Implemented by H.J. Lu.
5085 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5087 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5088 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5089 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5090 Contributed by H.J. Lu.
5092 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5093 Implemented by Ulrich Drepper.
5095 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5097 Contributed by H.J. Lu.
5099 * Support for fma instruction in AVX on x86-64.
5100 Implemented by H.J. Lu and Ulrich Drepper.
5102 * AVX support in x86-64 auditing support in ld.so.
5103 Implemented by H.J. Lu.
5105 * STB_GNU_UNIQUE support added.
5106 Implemented by Ulrich Drepper.
5108 * Implement second fallback mode for optimized DNS lookup for even more
5109 broken environments. If two requests from the same port are not
5110 handled correctly close the socket and open a new one before sending
5111 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5112 can be used to select this mode right away, instead of rediscovering the
5113 necessity is every process again.
5114 Implemented by Ulrich Drepper.
5116 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5117 Implemented by Adam Tkac.
5119 * Optimized iconv conversions for S390x.
5120 Implemented by Andreas Krebbel.
5122 * Using condvars with PI mutexes is now more efficient due to kernel
5123 support for requeueing to PI futexes. NPTL support added for x86-64.
5124 Implemented by Ulrich Drepper.
5126 * New locales: ps_AF, my_MM
5130 * The following bugs are resolved with this release:
5132 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5133 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5134 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5135 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5136 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5138 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5139 Implemented by Ulrich Drepper.
5141 * New Linux interfaces: accept4, fallocate, fallocate64.
5142 Implemented by Ulrich Drepper.
5144 * Correct declarations of string function when used in C++ code. This
5145 could lead to compile errors for invalid C++ code.
5147 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5150 * New POSIX 2008 interface: psiginfo
5151 Implemented by Ulrich Drepper.
5153 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5154 Implemented by Ulrich Drepper.
5156 * Support for selecting between multiple function definitions at runtime
5157 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5159 * The libcrypt library can now use the hash function implementations in
5160 NSS. Implemented by Ulrich Drepper.
5162 * The malloc implementation can be compiled to be less memory efficient
5163 but higher performing in multi-threaded programs.
5164 Implemented by Ulrich Drepper.
5166 * New locales: nan_TW@latin, ks_IN
5168 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5169 Implemented by Ulrich Drepper.
5171 * Extended printf hook support. It is possible to use user-defined types
5172 and extend existing format specifiers.
5173 Implemented by Ulrich Drepper.
5175 * Handling for group shadow files has been added.
5176 Implemented by Ulrich Drepper.
5178 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5179 servers (the case, e.g., for some people using the built-in DNS
5180 server in ADSL modems/routers). There is a once-per-process timeout
5181 in case of a broken server. To avoid it, users can run nscd or put
5182 'options single-request' in /etc/resolv.conf.
5183 Implemented by Ulrich Drepper.
5187 * The following bugs are resolved with this release:
5189 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5190 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5191 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5192 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5193 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5195 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5196 up at the same time. Implemented by Ulrich Drepper.
5198 * TLS descriptors for LD and GD on x86 and x86-64.
5199 Implemented by Alexandre Oliva.
5201 * getaddrinfo now handles DCCP and UDPlite.
5202 Implemented by Ulrich Drepper.
5204 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5205 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5206 Implemented by Ulrich Drepper.
5208 * New implementation of memmem, strstr, and strcasestr which is O(n).
5209 Implemented by Eric Blake.
5211 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5213 * Implement "e" option for popen to open file descriptor with the
5214 close-on-exec flag set. Implemented by Ulrich Drepper.
5216 * Implement "b" mode for fmemopen. In this mode writes writes don't
5217 implicitly add a NUL byte and seeks from the end of the buffer really
5218 use the buffer end, not the string length as the basis.
5219 Implemented by Ulrich Drepper.
5221 * Many functions, exported and internal, now atomically set the close-on-exec
5222 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5224 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5226 Implemented by Pravin Satpute.
5228 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5232 * The following bugs are resolved with this release:
5234 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5235 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5236 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5237 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5238 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5239 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5240 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5242 * New locales: bo_CN, bo_IN, shs_CA.
5244 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5246 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5247 Implemented by Pravin Satpute.
5249 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5251 * nscd caches now all timeouts for DNS entries
5252 Implemented by Ulrich Drepper.
5254 * nscd is more efficient and wakes up less often.
5255 Implemented by Ulrich Drepper.
5257 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5258 vdprintf, and obstack_vprintf.
5259 Implemented by Jakub Jelinek.
5261 * Faster memset for x86-64.
5262 Implemented by Harsha Jagasia and H.J. Lu.
5264 * Faster memcpy on x86.
5265 Implemented by Ulrich Drepper.
5267 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5268 Implemented by Ulrich Drepper.
5270 * Faster sqrt and sqrtf implemention for some PPC variants.
5271 Implemented by Steven Munroe.
5275 * The following bugs are resolved with this release:
5277 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5278 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5279 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5280 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5281 5071, 5103, 5104, 5112, 5113, 5184, 5186
5283 * More checking functions: fread, fread_unlocked, open*, mq_open.
5284 Implemented by Jakub Jelinek and Ulrich Drepper.
5286 * Extend fortification to C++. Implemented by Jakub Jelinek.
5288 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5289 by not recognizing 'a' as a modifier when those specs are requested.
5290 Implemented by Jakub Jelinek.
5292 * PPC optimizations to math and string functions.
5293 Implemented by Steven Munroe.
5295 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5296 options to be passed. Implemented by Ulrich Drepper.
5298 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5300 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5301 Implemented by Ulrich Drepper.
5303 * Handle private futexes in the NPTL implementation.
5304 Implemented by Jakub Jelinek and Ulrich Drepper.
5306 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5307 Implemented by Roland McGrath and Ulrich Drepper.
5309 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5311 * SHA-256 and SHA-512 based password encryption.
5312 Implemented by Ulrich Drepper.
5314 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5315 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5318 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5319 Implemented by Ulrich Drepper.
5323 * The following bugs are resolved with this release:
5325 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5326 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5327 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5328 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5329 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5330 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5331 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5334 * New Linux interfaces: epoll_pwait, sched_getcpu.
5336 * New generic interfaces: strerror_l.
5338 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5342 * The following bugs are resolved with this release:
5344 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5345 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5346 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5347 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5348 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5349 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5350 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5351 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5352 3225, 3251, 3252, 3253, 3273
5354 * For Linux, the sorting of addresses returned by getaddrinfo now also
5355 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5356 Implemented by Ulrich Drepper.
5358 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5359 Implemented by Ulrich Drepper.
5361 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5363 * New iconv module for MIK. Contributed by Alexander Shopov.
5365 * For sites with broken group and/or passwd database, the auto-propagate
5366 option of nscd can prevent creating ID lookup entries from the results
5367 of a name lookup and vice versa. This usually is no problem but some
5368 site might have problems with the default behavior.
5369 Implemented by Ulrich Drepper.
5371 * Iterating over entire database in NIS can be slow. With the
5372 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5373 to trade time for memory. The entire database will be read at once.
5374 Implemented by Ulrich Drepper.
5376 * The interfaces introduced in RFC 3542 have been implemented by
5379 * Support for the new ELF hash table format was added by Ulrich Drepper.
5381 * Support for priority inheritance mutexes added by Jakub Jelinek and
5384 * Support for priority protected mutexes added by Jakub Jelinek.
5386 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5387 or_IN, csb_PL, fy_NL, sr_ME.
5391 * More overflow detection functions.
5393 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5394 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5396 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5397 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5398 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5399 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5400 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5401 by Masahide Washizawa.
5403 * It is now possible to install audit libraries for the dynamic linker using
5404 LD_AUDIT. Implemented by Ulrich Drepper.
5406 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5407 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5408 For a libc and libpthread that works well on Linux 2.4 kernels, we
5409 recommend using the stable 2.3 branch.
5411 * The new function open_wmemstream acts like open_memstream,
5412 but uses a wchar_t wide character buffer.
5414 * The new function ppoll is an improved version of poll, similar to pselect.
5416 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5417 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5418 renameat, unlinkat, linkat, symlinkat, readlinkat.
5420 * New Linux kernel system calls: unshare,
5421 inotify_init, inotify_add_watch, inotify_rm_watch.
5423 * The euidaccess function is now also known by the alias eaccess,
5424 for compatibility with some other systems.
5426 * Timezone data updated to 2006b version.
5430 * The following bugs are resolved with this release:
5432 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5433 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5434 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5435 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5436 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5437 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5439 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5441 * As of this release, GCC 4 can be used to compile the C Library.
5443 * Timezone data updated to 2005m version.
5447 * The following bugs are resolved with this release:
5449 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5450 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5451 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5452 777, 787, 821, 822, 823, 825
5454 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5458 * Support for RFC 3678. Real implementations exist only for Linux so far.
5459 Implemented by Ulrich Drepper.
5461 * nscd can now cache entries persistently. Expiring entries are reloaded.
5462 For speedups the cache can be shared in memory with client processes.
5463 Implemented by Ulrich Drepper.
5465 * nscd can now perform SELinux checks.
5466 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5468 * getaddrinfo queries are now cached. Canonical name lookup is performed
5470 Implemented by Ulrich Drepper.
5472 * The nothrow function attribute is used when headers are used by gcc when
5473 compiling C code. This can avoid significant amounts of exception
5476 * The malloc functions perform more error checking and are stricter when
5477 it comes to reacting on errors. The default action is to terminate
5478 the process after showing an error message. Implemented by Ulrich Drepper.
5480 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5481 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5483 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5484 namespaces using the new function dlmopen(). This feature is of course,
5485 like most other dynamic loading functionality, not available in statically
5486 linked applications. Implemented by Ulrich Drepper.
5488 * Low-overhead boundary checking variants of string and some stdio functions
5489 were added. These are to be used in conjunction with a gcc patch by
5490 Jakub Jelinek which adds calls to these functions if possible.
5491 Implemented by Jakub Jelinek and Ulrich Drepper.
5493 * Old code for several operating systems and machine architectures that
5494 have not been in working condition in a long time have been removed from
5495 the main source tree maintained by the GNU C Library's maintainers.
5496 These files are now reside in the separate `ports' source module
5497 that is usable as an add-on when building the library.
5501 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5502 interrogate the dynamic linker, compatible with the Solaris interface.
5504 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5505 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5507 * getifaddrs now uses the netlink interface on Linux to get its information.
5508 Implemented by Thorsten Kukuk.
5510 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5511 Implemented by Ulrich Drepper.
5513 * support for non-executable stacks on x86 has been added. Changes mostly
5516 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5519 * getaddrinfo now performs destination address selection according to
5524 * Thread-safe interfaces for many functions that access locale data
5525 were added in version 2.3, but these features were omitted from NEWS.
5526 Many functions have variants with an `_l' suffix that take a `locale_t'
5527 object as a parameter rather than consulting the current locale.
5528 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5529 create and maintain `locale_t' objects. Additionally, the new function
5530 `uselocale' sets "the current locale" (as used by functions not so
5531 parameterized) set for an individual thread. These features were added
5532 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5534 * The functions getresuid, getresgid, setresuid, and setresgid, which
5535 have long been available on Linux, are now declared in <unistd.h>
5536 and are now also available on the Hurd.
5538 * ELF thread-local storage support (TLS) now works on x86-64.
5540 * The new dynamic string token $LIB is expanded in shared library names.
5541 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5543 * Aldy Hernandez contributed complete software floating point support for
5544 PowerPC machines with no FPU.
5546 * fexecve is implemented on Linux.
5548 * The `btowc' function should work at least twice as fast due to
5549 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5551 * With approriate thread add-ons cancelable functions are now implemented
5552 in libc.so as well. No need to call the function in libpthread. This
5553 change allowed to finally disable the incorrect and expensive handling
5554 of weak definition in ld.so.
5556 * Yet more PLT entries in libc.so have been removed. We finally arrived
5557 at the bare minimum. Startup times improved appropriately.
5559 * Support for the new Linux/x86 system call interface was added. The
5560 AT_SYSINFO auxiliary vector entry is recognized and handled.
5564 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5567 * iconv (the program and the interface) now accepts empty names (excluding
5568 options like //TRANSLIT) to mean "use charset of current locale".
5570 * localedef can now transliterate characters in strings which are not in
5571 the provided charmap. The information from the input locale is used.
5573 * Prelinking support was added for ELF targets. This requires additional
5574 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5576 * Read-only stdio streams now use mmap to speed up operation by eliminating
5577 copying and buffer underflows. To use add 'm' to the mode string of
5578 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5580 * The malloc functions were completely rewritten by Wolfram Gloger based
5581 on Doug Lea's malloc-2.7.0.c.
5583 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5584 implementation of regex.
5586 * Bruno Haible upgraded the iconv and locale implementation to support
5589 * Contents of the LC_* and LANG environment variables in the CEN style are
5590 not recognized anymore. It never was used. Change by Ulrich Drepper.
5592 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5593 thread-local storage (TLS) ABI on some platforms.
5594 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5596 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5597 EUC-JISX0213, and TSCII.
5599 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5600 BSD-compatible interface for getting all network interface addresses.
5601 Implementation for IPv4 by Roland McGrath.
5603 * Loading of locale data is faster due to the introduction of a locale
5604 archive. Implemented by Roland McGrath and Ulrich Drepper.
5606 * Startup times are significantly reduced by not using exported functions
5607 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5610 * Steven Munroe contributed a port to PowerPC64/Linux.
5614 * The Hurd now uses the GNU libio implementation of stdio rather than the
5615 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5617 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5618 with the same behavior as the Linux system call of the same name.
5622 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5623 128-bit long double format.
5625 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5626 IBM1161, and IBM1162 charsets.
5628 * Andreas Jaeger contributed a port to x86-64/Linux.
5630 * Peter Bruin contributed a port to PowerPC/Hurd.
5632 * libc functions using I/O streams now can handle wide-oriented streams
5635 * optimizations in the dynamic linker. Binaries created by recent binutils
5636 versions start up quicker due to reduced time spent on relocations.
5638 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5642 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5643 asinh, atanh, j0 for the 128-bit long double format.
5645 * Bruno Haible updated all the code handling Unicode in some form to
5646 support Unicode 3.1.
5648 * Speed of regex for single-byte locales is back to previous levels.
5649 Patch by Isamu Hasegawa.
5651 * Alpha, SPARC, and IA-64 now also using floating stacks.
5653 * Startup time of internationalized applications greatly improved through
5654 iconv cache. Use iconvconfig to generate the cache file.
5655 Contributed by Ulrich Drepper.
5657 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5658 severe performance problems. Patch by David Mosberger.
5660 * The Hurd port got a lot more functionality like AIO, various stdio
5661 extensions, etc. Mainly done by Roland McGrath.
5663 * mtrace can now lookup symbols in shared libraries.
5667 * Intel's IA-64 math library is largely integrated. It provides fast and
5668 accurate implementatations for most basic and standard math functions
5669 in float, double, and long double format.
5671 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5672 and asin for the 96-bit long double format and asin, log, tan for the
5673 128-bit long double format.
5675 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5676 The basic double functions exist today. Contributed by Abraham Ziv
5677 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5678 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5680 * An asynchronous name lookup library was added. The interface is designed
5681 after POSIX AIO. The proposal was circulated beforehand to get comments.
5682 No negative ones came in. Implemented by Ulrich Drepper.
5684 * Port to S390/64bit contributed by Martin Schwidefsky
5685 <schwidefsky@de.ibm.com>.
5687 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5688 of functions for Linux/IA-64.
5690 * The RPC code is now thread safe. Threads can now use the same service
5691 of different services at the same time. Patch by Eric Norum
5692 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5694 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5695 family of functions for Linux/S390.
5697 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5698 of functions for Linux/x86.
5700 * Port to Linux/CRIS contributed by Axis Communications.
5704 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5705 we can now check for namespace violations and missing declarations. The
5706 result is that almost all headers are now Unix-compliant (as defined in
5707 the upcoming XPG6). The negative side is that some programs might need
5708 corrections, too, if they depend on the incorrect form of the headers in
5709 previous versions which defined too many symbols and included too many
5712 * regex now handles multibyte character sets correctly.
5713 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5715 * iconv (the program) does now conform to the upcoming XPG6 and handles
5716 charmaps. Instead of the charset names the path of charmaps can be
5717 provided and the conversion happens based on this data.
5718 Contributed by Ulrich Drepper.
5720 * The locale program now provides detailed information about the installed
5725 only lists the names of the supported locales
5729 provides details such as country, language, and codeset name.
5730 Contributed by Ulrich Drepper.
5734 * The gencat program now parses the input file according to the charset
5735 selected by the LC_CTYPE category. This is important for stateful
5736 character sets. To make generating catalogs easier there is a way
5737 to overwrite the charset selected by the locale: before the first
5738 message or $ quote line the catalog can contain a line like
5740 $ codeset=ISO-8859-2
5742 to select the charset (ISO-8859-2 in this case).
5744 Implemented by Shinya Hanataka and Ulrich Drepper.
5746 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5747 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5748 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5750 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5751 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5753 * The LANGUAGE environment variable is now ignored unless the locale is
5754 changed from the default "C" locale.
5756 * The usual bug fixes.
5760 * Greg McGary added runtime support for bounds checking using gcc's
5761 new -fbounded-pointers option. ix86 target is complete. PowerPC
5764 * Thorsten Kukuk added secure mode support to nscd.
5766 * The Berkeley db libraries have been removed.
5768 Related, the nss_db module is now in a separate package since it
5769 obviously requires a database library being available.
5771 * Wide character I/O streams implemented by Ulrich Drepper.
5773 * Functions from the extended socket API added by Ulrich Drepper.
5775 * Functions feenableexcept and fedisableexcept to control the
5776 behaviour of individual exceptions have been added by Andreas Jaeger.
5778 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5780 * The resolver code has been updated from bind 8.2.3-T5B which supports
5781 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5784 This change could in some situations effect backward compatibility. Since
5785 now `_res' is a thread-local instead of a global variable, modifying it
5786 in one thread does not have any effect in other threads.
5788 The resolver library was also extended to allow IPv6 as the transport
5789 protocol for the requests. This work was done by Stig Venaas.
5791 * Compatibility code for K&R C compilers has been removed from the
5792 header files. A ISO C compiler is needed to use the library
5793 (conforming to either C89 or C99 standard).
5795 * Complete rewrite of the localedef program to support multibyte character
5796 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5797 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5798 Implemented by Ulrich Drepper.
5800 Bruno Haible significantly improved the generation and use of the data
5801 structures for the wide character tables.
5803 * Plural handling in gettext implemented by Ulrich Drepper.
5805 * The utmp daemon has been removed.
5807 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5809 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5812 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5814 * POSIX barriers implemented by Kaz Kylheku.
5816 * POSIX spawn function family implemented by Ulrich Drepper.
5818 * POSIX spinlocks are now available.
5820 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5822 * the configure option --enable-kernel=X.Y.Z allows to strip out
5823 compatibility for kernel versions before X.Y.Z. This is currently only
5824 implemented for Linux.
5826 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5827 field sin6_scope_id. This means that all programs using IPv6 should be
5828 recompiled. Don't expect binary compatibility with previous glibc
5831 * various conversion modules for IBM character sets contributed by
5834 * IA-64 port by Jes Sorensen and HJ Lu.
5848 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5850 * New xdr functions are added; some rpc functions are now 64bit clean.
5852 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5854 * Fixed known incompatibilities with glibc 2.0.
5856 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5858 * Optimized a number of functions (especially the ELF dynamic loader).
5860 * Update timezone data files.
5862 * lots of charmaps corrections
5864 * some new locale definitions and charmaps
5869 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5870 conform to POSIX member type requirements. Symbol versions have been
5871 adjusted as needed within the library, and for direct use by applications,
5872 but there is potential for problems if third-party libraries use
5873 struct timeval as part of their interface. This does not present
5874 a problem for X and other "essential" system libraries.
5876 * An additional locale model to support C++ Standard Library locale
5877 model and probably more was implemented by Ulrich Drepper.
5879 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5882 * Miles Bader provided the `argp' function family to support hierachical
5883 command line argument parsing, layered on top of getopt.
5885 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5887 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5890 * scanf recognizes the %a and %A format for scanning floating point numbers.
5892 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5893 information and interfaces for the available integer types.
5895 * about 130 new math functions were added to implement the ISO C9x math
5898 * the new header <complex.h> contains definitions of the complex math
5899 functions from ISO C 9X.
5901 * the new header <tgmath.h> defines generic macros to use complex or
5902 real valued functions.
5904 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5906 * Andreas Jaeger provided a test suite for the math library.
5908 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5910 * Ulrich Drepper added character set conversion functions (iconv).
5912 * Optimized string functions have been added.
5914 * The localedata addon is now part of glibc.
5916 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5918 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5919 daemon for NSS (nscd).
5921 Missing a better place here are some numbers on improvements. Under
5922 Linux 2.1.125 un-tar-ing the kernel sources takes
5926 using local files 12.19s 6.88s 22.91s
5928 using NIS 13.92s 8.91s 26.34s
5930 using NIS & nscd 10.37s 7.34s 25.30s
5932 using NIS+ 27.57s 30.37s 640.46s
5934 using NIS+ & nscd 10.25s 7.83s 26.51s
5936 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5938 Keep in mind that non-namelookup related operations dominate above times.
5939 It was just a common complain that using NIS+ unpacking the kernel is
5942 [1] The old nscd implementation is not available anymore since it was
5943 distributed with glibc up to version 2.0.98 and thus is now replaced.
5945 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5947 * Mark Kettenis provided a Hesiod NSS module.
5949 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5950 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5952 * rcmd can now handle netgroups (Dick Streefland).
5954 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5957 * Support for the IPv6 protocol has been added to the socket API, as per the
5958 latest draft standards.
5960 * Support for Linux 2.2 has been added.
5962 * Interface changes relative to the latest 2.0.x release:
5963 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5964 addseverity NEW: Unix98
5965 alphasort64 NEW: LFS
5966 argp_err_exit_status NEW: argp, GNU ext
5967 argp_error NEW: argp, GNU ext
5968 argp_failure NEW: argp, GNU ext
5969 argp_help NEW: argp, GNU ext
5970 argp_parse NEW: argp, GNU ext
5971 argp_program_bug_address NEW: argp, GNU ext
5972 argp_program_version NEW: argp, GNU ext
5973 argp_program_version_hook NEW: argp, GNU ext
5974 argp_state_help NEW: argp, GNU ext
5975 argp_usage NEW: argp, GNU ext
5976 authdes_create NEW: Secure RPC
5977 authdes_getucred NEW: Secure RPC
5978 authdes_pk_create NEW: Secure RPC
5979 backtrace NEW: GNU ext.
5980 backtrace_symbols NEW: GNU ext.
5981 backtrace_symbols_fd NEW: GNU ext.
5983 cacosf NEW: ISO C 9x
5984 cacosh NEW: ISO C 9x
5985 cacoshf NEW: ISO C 9x
5986 cacoshl NEW: ISO C 9x
5987 cacosl NEW: ISO C 9x
5994 casinf NEW: ISO C 9x
5995 casinh NEW: ISO C 9x
5996 casinhf NEW: ISO C 9x
5997 casinhl NEW: ISO C 9x
5998 casinl NEW: ISO C 9x
6000 catanf NEW: ISO C 9x
6001 catanh NEW: ISO C 9x
6002 catanhf NEW: ISO C 9x
6003 catanhl NEW: ISO C 9x
6004 catanl NEW: ISO C 9x
6005 cbc_crypt NEW: Secure RPC
6009 ccoshf NEW: ISO C 9x
6010 ccoshl NEW: ISO C 9x
6016 cimagf NEW: ISO C 9x
6017 cimagl NEW: ISO C 9x
6018 clearerr_locked REMOVED
6019 clntunix_create NEW: sunrpc ext
6021 clog10 NEW: ISO C 9x
6022 clog10f NEW: ISO C 9x
6023 clog10l NEW: ISO C 9x
6033 cprojf NEW: ISO C 9x
6034 cprojl NEW: ISO C 9x
6036 crealf NEW: ISO C 9x
6037 creall NEW: ISO C 9x
6042 csinhf NEW: ISO C 9x
6043 csinhl NEW: ISO C 9x
6046 csqrtf NEW: ISO C 9x
6047 csqrtl NEW: ISO C 9x
6051 ctanhf NEW: ISO C 9x
6052 ctanhl NEW: ISO C 9x
6054 des_setparity NEW: Secure RPC
6055 ecb_crypt NEW: Secure RPC
6056 endutxent NEW: Unix98
6058 exp10f NEW: ISO C 9x
6059 exp10l NEW: ISO C 9x
6063 fattach NEW: STREAMS
6064 fdetach NEW: STREAMS
6068 feclearexcept NEW: ISO C 9x
6069 fegetenv NEW: ISO C 9x
6070 fegetexceptflag NEW: ISO C 9x
6071 fegetround NEW: ISO C 9x
6072 feholdexcept NEW: ISO C 9x
6074 feraiseexcept NEW: ISO C 9x
6075 ferror_locked REMOVED
6076 fesetenv NEW: ISO C 9x
6077 fesetexceptflag NEW: ISO C 9x
6078 fesetround NEW: ISO C 9x
6079 fetestexcept NEW: ISO C 9x
6080 feupdateenv NEW: ISO C 9x
6081 fflush_locked REMOVED
6085 fgets_unlocked NEW: GNU ext.
6086 fileno_locked REMOVED
6098 fputc_locked REMOVED
6099 fputs_unlocked NEW: GNU ext.
6100 fread_unlocked NEW: GNU ext.
6105 fstatvfs NEW: Unix98
6109 ftruncate64 NEW: LFS
6111 fwrite_unlocked NEW: GNU ext.
6112 gai_strerror NEW: IPv6
6116 getchar_locked REMOVED
6118 getdate_err NEW: Unix98
6119 getdate_r NEW: GNU ext.
6121 getnameinfo NEW: IPv6
6122 getnetname NEW: Secure RPC
6123 getpmsg NEW: STREAMS
6124 getpt NEW: Unix98 PTY
6125 getrlimit64 NEW: LFS
6126 getutxent NEW: Unix98
6127 getutxid NEW: Unix98
6128 getutxline NEW: Unix98
6129 glob64 NEW: GNU ext.
6130 globfree64 NEW: GNU ext.
6131 gnu_get_libc_release NEW: GNU ext.
6132 gnu_get_libc_version NEW: GNU ext.
6133 grantpt NEW: Unix98 PTY
6134 host2netname NEW: Secure RPC
6136 iconv_close NEW: iconv
6137 iconv_open NEW: iconv
6138 if_freenameindex NEW: IPv6
6139 if_indextoname NEW: IPv6
6140 if_nameindex NEW: IPv6
6141 if_nametoindex NEW: IPv6
6142 in6addr_any NEW: IPv6
6143 in6addr_loopback NEW: IPv6
6144 inet6_isipv4mapped NEW: IPv6
6145 isastream NEW: STREAMS
6146 iswblank NEW: GNU ext.
6147 key_decryptsession NEW: Secure RPC
6148 key_decryptsession_pk NEW: Secure RPC
6149 key_encryptsession NEW: Secure RPC
6150 key_encryptsession_pk NEW: Secure RPC
6151 key_gendes NEW: Secure RPC
6152 key_get_conv NEW: Secure RPC
6153 key_secretkey_is_set NEW: Secure RPC
6154 key_setnet NEW: Secure RPC
6155 key_setsecret NEW: Secure RPC
6156 llrint NEW: ISO C 9x
6157 llrintf NEW: ISO C 9x
6158 llrintl NEW: ISO C 9x
6159 llround NEW: ISO C 9x
6160 llroundf NEW: ISO C 9x
6161 llroundl NEW: ISO C 9x
6166 lrintf NEW: ISO C 9x
6167 lrintl NEW: ISO C 9x
6168 lround NEW: ISO C 9x
6169 lroundf NEW: ISO C 9x
6170 lroundl NEW: ISO C 9x
6172 makecontext NEW: Unix98
6173 mempcpy NEW: GNU ext.
6176 modify_ldt NEW: kernel
6180 nearbyint NEW: ISO C 9x
6181 nearbyintf NEW: ISO C 9x
6182 nearbyintl NEW: ISO C 9x
6183 netname2host NEW: Secure RPC
6184 netname2user NEW: Secure RPC
6185 nexttoward NEW: ISO C 9x
6186 nexttowardf NEW: ISO C 9x
6187 nexttowardl NEW: ISO C 9x
6191 passwd2des NEW: Secure RPC
6193 pow10f NEW: GNU ext.
6194 pow10l NEW: GNU ext.
6197 printf_size NEW: GNU ext.
6198 printf_size_info NEW: GNU ext.
6199 profil_counter REMOVED
6200 pthread_mutexattr_getkind_np REPLACED
6201 pthread_mutexattr_setkind_np REPLACED
6202 ptsname NEW: Unix98 PTY
6203 ptsname_r NEW: Unix98 PTY
6205 putchar_locked REMOVED
6206 putgrent NEW: GNU ext.
6208 putpmsg NEW: STREAMS
6209 pututxline NEW: Unix98
6213 readdir64_r NEW: LFS
6214 remquo NEW: ISO C 9x
6215 remquof NEW: ISO C 9x
6216 remquol NEW: ISO C 9x
6218 roundf NEW: ISO C 9x
6219 roundl NEW: ISO C 9x
6221 scalbln NEW: ISO C 9x
6222 scalblnf NEW: ISO C 9x
6223 scalblnl NEW: ISO C 9x
6225 sendfile NEW: kernel
6226 setcontext NEW: Unix98
6227 setrlimit64 NEW: LFS
6228 setutxent NEW: Unix98
6230 sigignore NEW: Unix98
6231 sigqueue NEW: POSIX.1b
6232 sigrelse NEW: Unix98
6233 sigset NEW: POSIX.1b
6234 sigtimedwait NEW: POSIX.1b
6235 sigwaitinfo NEW: POSIX.1b
6236 sincos NEW: GNU ext.
6237 sincosf NEW: GNU ext.
6238 sincosl NEW: GNU ext.
6242 strcasestr NEW: GNU ext.
6243 strtoimax NEW: ISO C 9x
6244 strtoumax NEW: ISO C 9x
6245 strverscmp NEW: GNU ext.
6246 svcauthdes_stats NEW: Secure RPC
6247 svcunix_create NEW: sunrpc etx
6248 svcunixfd_create NEW: sunrpc ext
6249 swapcontext NEW: Unix98
6250 tcgetsid NEW: Unix98 PTY
6251 tdestroy NEW: GNU ext.
6252 tgamma NEW: ISO C 9x
6253 tgammaf NEW: ISO C 9x
6254 tgammal NEW: ISO C 9x
6258 truncf NEW: ISO C 9x
6259 truncl NEW: ISO C 9x
6261 unlockpt NEW: Unix98 PTY
6262 updwtmpx NEW: Unix98
6263 user2netname NEW: Secure RPC
6264 utmpxname NEW: Unix98
6265 versionsort NEW: GNU ext.
6266 versionsort64 NEW: GNU ext.
6268 wcscasecmp NEW: GNU ext.
6269 wcsncasecmp NEW: GNU ext.
6270 wcsnlen NEW: GNU ext.
6271 wcstoimax NEW: ISO C 9x
6272 wcstoll NEW: ISO C 9x
6273 wcstoull NEW: ISO C 9x
6274 wcstoumax NEW: ISO C 9x
6276 wordexp NEW: POSIX.2
6277 wordfree NEW: POSIX.2
6278 write_profiling REMOVED
6279 xdecrypt NEW: Secure RPC
6280 xdr_authdes_cred NEW: Secure RPC
6281 xdr_authdes_verf NEW: Secure RPC
6282 xdr_cryptkeyarg NEW: Secure RPC
6283 xdr_cryptkeyarg2 NEW: Secure RPC
6284 xdr_cryptkeyres NEW: Secure RPC
6285 xdr_getcredres NEW: Secure RPC
6286 xdr_key_netstarg NEW: Secure RPC
6287 xdr_key_netstres NEW: Secure RPC
6288 xdr_keybuf NEW: Secure RPC
6289 xdr_keystatus NEW: Secure RPC
6290 xdr_netnamestr NEW: Secure RPC
6291 xdr_sizeof NEW: Secure RPC
6292 xdr_unixcred NEW: sunrpc ext
6293 xencrypt NEW: Secure RPC
6294 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6305 * inet_ntoa is thread-safe
6307 * updwtmp is moved from libutil to libc
6309 * rewrite of cbrt function
6311 * update of timezone data
6325 * add atoll function
6327 * fix complex problems in Berkeley DB code
6329 * fix math functions
6333 * fixed lots of header problems (especially Linux/GNU specific)
6335 * dynamic loader preserves all registers
6337 * Roland McGrath provided support for handling of auxiliary objects in
6338 the ELF dynamic loader.
6340 * support for parallel builds is improved
6344 * GNU extensions are no longer declared by default. To enable them you
6345 must define the macro `_GNU_SOURCE' in your program or compile with
6348 * The library has changed from using GNU ld symbol aliases to using weak
6349 symbols where available. The ELF object file format supports weak
6350 symbols; GNU ld also supports weak symbols in the a.out format. (There
6351 is also now support for other GNU ld extensions in ELF. Use the
6352 `--with-elf' option to configure to indicate you have ELF, and
6353 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6354 of many files which contained only symbol aliases, reducing the size of
6355 the source and the compiled library; many other files were renamed to
6356 less cryptic names previously occupied by the symbol alias files.
6357 There is a new header file <elf.h> for programs which operate on
6358 files in the ELF format.
6360 * Converted to Autoconf version 2, so `configure' has more options.
6361 Run `configure --help' to see the details.
6363 * The library can now be configured to build profiling, highly-optimized
6364 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6365 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6366 `configure' enable building these extra libraries. The shared library is
6367 built by default when using both ELF and GNU ld. When shared libraries
6368 are enabled, the new library `-ldl' is available for arbitrary run-time
6369 loading of shared objects; its interface is defined in <dlfcn.h>. The
6370 new header file <link.h> gives access to the internals of the run-time
6371 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6372 application of same name on other systems and it provides information
6373 about dynamically linked binaries.
6375 * The C library now provides the run-time support code for profiling
6376 executables compiled with `-pg'. Programs can control the profiling code
6377 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6378 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6379 the support for this file format was contributed by David Mosberger-Tang.
6381 * The math code has been replaced with a math library based on fdlibm from
6382 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6383 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6384 functions. The math functions now reside in a separate library, so
6385 programs using them will need to use `-lm' their linking commands.
6387 * John C. Bowman contributed optimized ix87 assembler inline functions.
6389 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6390 mechanism similar to that found in Solaris 2. This is now used for the
6391 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6392 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6393 file controls what services are used for each individual database. This
6394 works by loading shared libraries with names specified in `nsswitch.conf',
6395 so service modules can be changed or added at any time without even
6396 relinking any program. Currently there are the file, db, and NIS based
6397 NSS services available.
6399 * The new functions `strtoq' and `strtouq' parse integer values from
6400 strings, like `strtol' and `strtoul', but they return `long long int' and
6401 `unsigned long long int' values, respectively (64-bit quantities).
6403 * The new functions `strtof' and `strtold' parse floating-point values from
6404 strings, like `strtod', but they return `float' and `long double' values,
6405 respectively (on some machines `double' and `long double' are the same).
6407 * Ulrich Drepper has contributed new implementations of the floating-point
6408 printing and reading code used in the `printf' family of functions and
6409 `strtod', `strtof', and `strtold'. These new functions are perfectly
6410 accurate, and much faster than the old ones.
6412 * The implementation of the POSIX locale model was completely rewritten by
6413 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6414 to compile the POSIX locale definition.
6416 * The former dummy implementations of the strcoll and strxfrm function are
6417 now replaced by fully functional code contributed by Ulrich Drepper. The
6418 collation information comes from the POSIX locale definitions.
6420 * The new header <langinfo.h> defines an interface for accessing
6421 various locale-dependent data (using the locale chosen with `setlocale').
6423 * Ulrich Drepper has contributed a new suite of functions for operation on
6424 wide-character and multibyte-character strings, in <wchar.h>;
6425 and classification and case conversion of wide characters, in <wctype.h>.
6426 These new functions are conforming to the ISO C, Amendement 1 specification.
6428 * There is now a second implementation of the standard I/O library available.
6429 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6430 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6432 * You can now use positional parameter specifications in format strings
6433 for the `printf' and `scanf' families of functions. For example,
6434 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6435 ``Number 6, Mr Jones''. This is mainly useful when providing different
6436 format strings for different languages, whose grammars may dictate
6437 different orderings of the values being printed. To support this
6438 feature, the interface for `register_printf_handler' has changed; see
6439 the header file <printf.h> for details.
6441 * The `printf' and `scanf' families of functions now understand a new
6442 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6443 to group numbers as indicated by the locale; for `scanf' and friends, this
6444 says to accept as valid only a number with all the proper grouping
6445 separators in the right places. In the default "C" locale, numbers are
6446 not grouped; but locales for specific countries will define the usual
6447 conventions (i.e. separate thousands with `,' in the US locale).
6449 * The pgrp functions have been regularized, slightly incompatibly but much
6450 less confusingly. The core functions are now `getpgid' and `setpgid',
6451 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6452 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6453 provided for compatibility. There is no longer an incompatible `getpgrp'
6454 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6456 * The new header file <fts.h> and suite of functions simplify programs that
6457 operate on directory trees. This code comes from 4.4 BSD.
6459 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6460 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6461 NSS scheme used in glibc.
6463 * There is a new malloc debugging hook `__memalign_hook'.
6465 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6466 `unsigned int' in <sys/types.h>. These are for compatibility only and
6467 their use is discouraged.
6469 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6470 done differently, so that it works even without GNU ld.
6472 * New function `euidaccess' checks allowed access to a file like `access',
6473 but using the effective IDs instead of the real IDs.
6475 * The time zone data files have been updated for the latest and greatest
6476 local time conventions of the countries of the world.
6478 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6481 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6482 for formatting floating-point numbers. They are provided only for
6483 compatibility; new programs should use `sprintf' instead. There are
6484 also equivalent function for the `long double' floating-point type and
6485 all functions also exist in a reentrant form.
6487 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6488 functions for maintaining the login-record files (primarily of use to
6489 system programs such as `login'), and convenient functions for
6490 allocating and initializing a pseudo-terminal (pty) device.
6492 * Ulrich Drepper has contributed new support for System V style
6493 shared memory and IPC on systems that support it.
6495 * Ulrich Drepper has contributed several miscellaneous new functions found
6496 in System V: The `hsearch' family of functions provide an effective
6497 implementation of hash tables; `a64l' and `l64a' provide a very simple
6498 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6501 * Ulrich Drepper has contributed new reentrant counterparts for the
6502 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6504 * Ulrich Drepper has contributed new, highly-optimized versions of several
6505 string functions for the i486/Pentium family of processors.
6507 * Ulrich Drepper has updated the Linux-specific code, based largely
6508 on work done in Hongjiu Lu's version of GNU libc for Linux.
6509 The GNU library now supports Linux versions 2.0.10 and later,
6510 using the ELF object file format (i[3456]86-*-linux).
6512 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6514 * David Mosberger-Tang and Richard Henderson have ported the C library
6515 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6516 dynamic linking support for ELF/Alpha.
6518 * Richard Henderson contributed several Alpha optimized assembler function
6519 for arithmetic and string handling.
6521 * Ulrich Drepper has contributed a new set of message catalog functions to
6522 support multiple languages using the <libintl.h> interface, for use with
6523 his new package GNU gettext. Translation volunteers have contributed
6524 catalogs of the library's messages in Spanish, German, and Korean.
6526 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6527 program and the `catgets' function for reading the catalog files it
6528 creates. (The <libintl.h> interface is preferred; we include the
6529 <nl_types.h> interface using `catgets' only for source compatibility with
6530 programs already written to use it.)
6532 * New header file <values.h> gives SVID-compatible names for <limits.h>
6535 * Various new macros, declarations, and small header files for compatibility
6538 * New function `group_member' is a convenient way to check if a process has
6539 a given effective group ID.
6541 * When using GCC 2.7 and later, the socket functions are now declared in a
6542 special way so that passing an argument of type `struct sockaddr_in *',
6543 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6544 `struct sockaddr *' type, does not generate a type-clash warning.
6546 * New function `error' declared in header file <error.h> is a convenient
6547 function for printing error messages and optionally exiting; this is the
6548 canonical function used in GNU programs. The new functions `err', `warn',
6549 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6550 doing the same thing.
6552 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6553 POSIX.2 `glob' function to do ~ and {...} expansion.
6555 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6556 `clearenv' which is used in POSIX.9 is also available.
6558 * New function `getsid' returns session ID number on systems that support it.
6560 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6561 files <db.h> and <mpool.h> provide a rich set of functions for several
6562 types of simple databases stored in memory and in files, and <ndbm.h> is
6563 an old `ndbm'-compatible interface using the `db' functions. Link with
6564 `-ldb' to get these functions.
6566 * New macro `strdupa' copies a string like `strdup', but uses local stack
6567 space from `alloca' instead of dynamic heap space from `malloc'.
6569 * New function `strnlen' is like `strlen' but searches only a given maximum
6570 number of characters for the null terminator. `stpncpy', `strndup' and
6571 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6574 * New function `statfs' in header <sys/statfs.h>.
6576 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6577 provide convenient functions for operating on blocks of null-terminated
6580 * A new suite of functions in <utmp.h> handle all the details of reading
6581 and writing the utmp file.
6583 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6586 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6587 completely POSIX compliant and also implemented the extended functionality
6588 to handle alternate digit representation and alternate era date formats.
6590 * Ulrich Drepper provided an implementation of the `strptime' function
6591 defined in XPG4.2 which transforms a string into a `struct tm' value.
6593 * Paul Eggert provided the tzselect shell script as part of the timezone
6594 code. The shell script makes it easy to select the correct timezone
6597 * The implementation of the malloc family of functions is completely replaced
6598 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6599 The implementation uses the mmap function (if available) and it is
6600 optimized for the use in multi threaded programs.
6602 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6603 functions. This new functionality is usable by specifying a special
6604 salt string and it is compatible with implementation on *BSD systems.
6606 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6607 `getsubopt' to handle second level command line options, `bsd_signal'
6608 to access BSD style `signal' functionality, the obsolete `regexp' style
6611 * the `lchown' function is available on system which support this
6614 * The implementation of the shadow password handling function was contributed
6617 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6619 * POSIX.1g support was added. The <sys/select.h> header is available,
6620 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6621 implementation of `getaddrinfo'.
6625 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6627 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6628 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6630 * The new function `daemon' from 4.4 BSD is useful for server programs that
6631 want to put themselves in the background.
6633 * Joel Sherrill has contributed support for several standalone boards that
6634 run without an operating system.
6636 * `printf', `scanf' and friends now accept a `q' type modifier for long
6637 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6639 * All of the code taken from BSD (notably most of the math and networking
6640 routines) has been updated from the BSD 4.4-Lite release.
6642 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6644 * The new functions `getdomainname' and `setdomainname' fetch or change the
6645 YP/NIS domain name. These are system calls which exist on systems which
6648 * The time zone data files have been updated for the latest international
6651 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6652 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6656 * The C library now includes support for Sun RPC, from Sun's free
6657 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6658 are included. (There is still no support for YP.)
6660 * Tom Quinn has contributed a port of the C library to SGI machines running
6661 Irix 4 (mips-sgi-irix4).
6663 * The new `lockf' function is a simplified interface to the locking
6664 facilities of `fcntl', included for compatibility.
6666 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6668 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6670 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6673 * The error message printed by `assert' for a failed assertion now includes
6674 the name of the program (if using GNU ld) and the name of the calling
6675 function (with versions of GCC that support this).
6677 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6679 * The library now includes the <sys/mman.h> header file and memory
6680 management functions `mmap', `munmap', `mprotect', `msync', and
6681 `madvise', on systems that support those facilities.
6683 * The interface for `mcheck' has changed slightly: the function called to
6684 abort the program when an allocation inconsistency is detected now takes
6685 an argument that indicates the type of failure. The new function
6686 `mprobe' lets you request a consistency check for a particular block at
6687 any time (checks are normally done only when you call `free' or `realloc'
6690 * It is now possible to easily cross-compile the C library, building on one
6691 system a library to run on another machine and/or operating system. All
6692 you need to do is set the variable `HOST_CC' in `configparms' to the
6693 native compiler for programs to run on the machine you are building on (a
6694 few generator programs are used on Unix systems); set `CC' to the
6697 * The new function `fexecve' (only implemented on the GNU system) executes
6698 a program file given a file descriptor already open on the file.
6702 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6703 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6705 * You can set the variable `libprefix' in `configparms' to specify a prefix
6706 to be prepended to installed library files; this makes it easy to install
6707 the GNU C library to be linked as `-lgnuc' or whatever.
6709 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6710 copies a limited number of characters from a string, and returns the
6711 address of the last character written.
6713 * You no longer need to check for whether the installed `stddef.h' is
6714 compatible with the GNU C library. configure now checks for you.
6716 * You can now define a per-stream `fileno' function to convert the
6717 stream's cookie into an integral file descriptor.
6719 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6720 allocates zero bytes of storage, and returns a unique pointer which
6721 you can pass to `realloc' or `free'. The behavior is undefined if
6722 you dereference this pointer.
6724 * The C library now runs on Sony NEWS m68k machines running either
6725 NewsOS 3 or NewsOS 4.
6727 * The new `syscall' function is a system-dependent primitive function
6728 for invoking system calls. It has the canonical behavior on Unix
6729 systems, including unreliable return values for some calls (such as
6730 `pipe', `fork' and `getppid').
6732 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6733 to `EAGAIN', which is the preferred name. On systems whose kernels
6734 use two distinct codes, the C library now translates EWOULDBLOCK to
6735 EAGAIN in every system call function.
6739 * The GNU C Library Reference Manual is now distributed with the library.
6740 `make dvi' will produce a DVI file of the printed manual.
6741 `make info' will produce Info files that you can read on line using C-h i
6742 in Emacs or the `info' program.
6743 Please send comments on the manual to bug-glibc-manual@gnu.org.
6745 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6747 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6749 * Jason Merrill has contributed a port to the Sequent Symmetry running
6750 Dynix version 3 (i386-sequent-dynix).
6752 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6753 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6755 * New function `memory_warnings' lets you arrange to get warnings when
6756 malloc is running out of memory to allocate, like Emacs gives you.
6758 * The C library now contains the relocating allocator used in Emacs 19 for
6759 its editing buffers. This allocator (ralloc) minimizes allocation
6760 overhead and fragmentation by moving allocated regions around whenever it
6761 needs to. You always refer to a ralloc'd region with a "handle" (a
6762 pointer to a pointer--an object of type `void **').
6764 * There is a new `printf' format: `%m' gives you the string corresponding
6765 to the error code in `errno'.
6767 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6768 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6769 pass, the `a' modifier says to fill in a `char **' you pass with a
6772 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6773 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6774 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6776 * `mkstemp' is a traditional Unix function to atomically create and open a
6777 uniquely-named temporary file.
6781 * The standard location for the file that says what the local timezone is
6782 has changed again. It is now `/usr/local/etc/localtime' (or more
6783 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6785 * The distribution no longer contains any files with names longer than 14
6788 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6789 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6791 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6795 * The configuration process has changed quite a bit. The `configure'
6796 script is now used just like the configuration scripts for other GNU
6797 packages. The `sysdeps' directory hierarchy is much rearranged.
6798 The file `INSTALL' explains the new scheme in detail.
6800 * The header files no longer need to be processed into ANSI C and
6801 traditional C versions. There is just one set of files to install, and
6802 it will work with ANSI or old C compilers (including `gcc -traditional').
6804 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6805 MIPS DECStation running Ultrix 4.
6807 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6808 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6809 made itself into a shared library.
6811 * Yet further improved support for the i386, running 4.3 BSD-like systems
6812 (such as Mach 3 with the Unix single-server), or System V.
6814 * New function `strncasecmp' to do case-insensitive string comparison
6815 with limited length.
6817 * New function `strsep' is a reentrant alternative to `strtok'.
6819 * New functions `scandir' and `alphasort' for searching directories.
6821 * New function `setenv' is a better interface to `putenv'.
6823 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6824 function for traversing a directory tree.
6826 * The GNU obstack package is now also part of the C library.
6827 The new function `open_obstack_stream' creates a stdio stream that
6828 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6829 formatted output directly to an obstack.
6831 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6832 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6834 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6836 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6837 things to your strings.
6839 * There are some new test programs: test-fseek, testmb, and testrand.
6841 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6842 These ports are not finished, but are a good starting place for really
6843 supporting those systems.
6845 * `/etc/localtime' is now the standard location for the file that says what
6846 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6847 This follows the general principle that `/etc' is the place for all local
6848 configuration files.
6850 * The C library header files now use `extern "C"' when used by the C++
6851 compiler, so the C library should now work with C++ code.
6853 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6854 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6857 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6858 function which uses the `merge sort' algorithm, and is said to be
6859 significantly faster than the old GNU `qsort' function. Merge sort is
6860 now the standard `qsort' function. The new algorithm can require a lot
6861 of temporary storage; so, the old sorting function is called when the
6862 required storage is not available.
6864 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6865 provides the Unix `crypt' function, plus some other entry points.
6867 * The code and header files taken from 4.4 BSD have been updated with the
6868 latest files released from Berkeley.
6870 ----------------------------------------------------------------------
6873 Permission is granted to anyone to make or distribute verbatim copies
6874 of this document as received, in any medium, provided that the
6875 copyright notice and this permission notice are preserved,
6876 thus giving the recipient permission to redistribute in turn.
6878 Permission is granted to distribute modified versions
6879 of this document, or of portions of it,
6880 under the above conditions, provided also that they
6881 carry prominent notices stating who last changed them.
6884 version-control: never