1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2023 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 * When C2X features are enabled and the base argument is 0 or 2, the
13 following functions support binary integers prefixed by 0b or 0B as
14 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
15 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
16 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
17 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
18 following functions support binary integers prefixed by 0b or 0B as
19 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
20 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf.
22 * PRIb* and PRIB* macros from C2X have been added to <inttypes.h>.
24 Deprecated and removed features, and other changes affecting compatibility:
26 * In the Linux kernel for the hppa/parisc architecture some of the
27 MADV_XXX constants were changed to have the same values as the other
28 architectures. New programs compiled with this glibc version and which
29 use the madvise call will require at least Linux kernel version 6.2,
30 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
31 5.4.228, 4.19.270 or 4.14.303.
33 Changes to build and runtime requirements:
35 [Add changes to build and runtime requirements here]
37 Security related changes:
39 CVE-2023-25139: When the printf family of functions is called with a
40 format specifier that uses an <apostrophe> (enable grouping) and a
41 minimum width specifier, the resulting output could be larger than
42 reasonably expected by a caller that computed a tight bound on the
43 buffer size. The resulting larger than expected output could result
44 in a buffer overflow in the printf family of functions.
46 The following bugs are resolved with this release:
48 [The release manager will add the list generated by
49 scripts/list-fixed-bugs.py just before the release.]
55 * The getent tool now supports the --no-addrconfig option. The output of
56 getent with --no-addrconfig may contain addresses of families not
57 configured on the current host i.e. as-if you had not passed
58 AI_ADDRCONFIG to getaddrinfo calls.
60 Deprecated and removed features, and other changes affecting compatibility:
62 * The dynamic linker no longer loads shared objects from the "tls"
63 subdirectories on the library search path or the subdirectory that
64 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
65 search mechanism, which was deprecated in version 2.33.
67 Security related changes:
69 CVE-2022-39046: When the syslog function is passed a crafted input
70 string larger than 1024 bytes, it reads uninitialized memory from the
71 heap and prints it to the target log file, potentially revealing a
72 portion of the contents of the heap.
74 The following bugs are resolved with this release:
76 [12154] network: Cannot resolve hosts which have wildcard aliases
77 [12165] libc: readdir: Do not skip entries with zero d_ino values
78 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
79 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
80 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
81 AF_INET6 address (ie docker)
82 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
84 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
85 [28937] dynamic-link: New DSO dependency sorter does not put new map
87 [29249] libc: csu/libc-tls.c:202: undefined reference to
88 `_startup_fatal_not_constant'
89 [29305] network: Inefficient buffer space usage in nss_dns for
90 gethostbyname and other functions
91 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
92 [29402] nscd: nscd: No such file or directory
93 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
95 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
96 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
98 [29463] math: math/test-float128-y1 fails on x86_64
99 [29485] build: Make hangs when the test misc/tst-pidfile returns
101 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
103 [29499] build: Check failed on misc/tst-glibcsyscalls while building
104 for RISCV64 on a unmatched hardware
105 [29501] build: Check failed on stdlib/tst-strfrom while building for
106 RISCV64 on a unmatched hardware
107 [29502] libc: alpha sys/acct.h out of date
108 [29514] build: Need to use -fPIE not -fpie
109 [29528] dynamic-link: __libc_early_init not called after dlmopen that
111 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
112 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
114 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
116 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
118 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
119 [29576] build: librtld.os: in function `_dl_start_profile':
120 (.text+0x9444): undefined reference to `strcpy'
121 [29578] libc: Definition of SUN_LEN() is wrong
122 [29583] build: iconv failures on 32bit platform due to missing large
124 [29600] dynamic-link: dlmopen hangs after loading certain libraries
125 [29604] localedata: Update locale data to Unicode 15.0.0
126 [29605] nscd: Regression in NSCD backend of getaddrinfo
127 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
129 [29611] string: Optimized AVX2 string functions unconditionally use
131 [29624] malloc: errno is not cleared when entering main
132 [29638] libc: stdlib: arc4random fallback is never used
133 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
135 [29698] build: Configuring for AArch32 on ARMv8+ disables
137 [29727] locale: __strtol_internal out-of-bounds read when parsing
139 [29730] libc: broken y2038 support in fstatat on MIPS N64
140 [29746] libc: ppoll() does not switch to __ppoll64 when
141 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
142 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
143 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
144 aux.S: No such file or directory)
145 [29864] libc: __libc_start_main() should obtain program headers
146 address (_dl_phdr) from the auxv, not the ELF header.
147 [29951] time: daylight variable not set correctly if last DST change
148 coincides with offset change
149 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
150 length in fortify mode
156 * Support for DT_RELR relative relocation format has been added to
157 glibc. This is a new ELF dynamic tag that improves the size of
158 relative relocations in shared object files and position independent
159 executables (PIE). DT_RELR generation requires linker support for
160 -z pack-relative-relocs option, which is supported for some targets
161 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
163 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
164 have been added. The pidfd functionality provides access to a process
165 while avoiding the issue of PID reuse on tranditional Unix systems.
167 * On Linux, the process_madvise function has been added. It has the
168 same functionality as madvise but alters the target process identified
171 * On Linux, the process_mrelease function has been added. It allows a
172 caller to release the memory of a dying process. The release of the
173 memory is carried out in the context of the caller, using the caller's
174 CPU affinity, and priority with CPU usage accounted to the caller.
176 * The “no-aaaa” DNS stub resolver option has been added. System
177 administrators can use it to suppress AAAA queries made by the stub
178 resolver, including AAAA lookups triggered by NSS-based interfaces
179 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
180 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
181 produce IPv6 addresses, and configured IPv6 name servers are still
182 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
183 are translated to A queries. The new resolver option is intended
184 primarily for diagnostic purposes, to rule out that AAAA DNS queries
185 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
186 validation by applications.
188 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
189 and mount_setattr have been added. They are part of the new Linux kernel
190 mount APIs that allow applications to more flexibly configure and operate
191 on filesystem mounts. The new mount APIs are specifically designed to work
194 * localedef now accepts locale definition files encoded in UTF-8.
195 Previously, input bytes not within the ASCII range resulted in
196 unpredictable output.
198 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
199 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
200 Support for the char8_t typedef has been added per the ISO C2X N2653
201 proposal. The functions are declared in uchar.h in C2X mode or when the
202 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
203 The char8_t typedef is declared in uchar.h in C2X mode or when the
204 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
205 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
207 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
208 added. The functions wrap getrandom and/or /dev/urandom to return high-
209 quality randomness from the kernel.
211 * Support for LoongArch running on Linux has been added. This port requires
212 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
215 - loongarch64-linux-gnu
217 The LoongArch ABI is 64-bit little-endian.
219 Deprecated and removed features, and other changes affecting compatibility:
221 * Support for prelink will be removed in the next release; this includes
222 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
223 variables and their functionality in the dynamic loader.
225 * The Linux kernel version check has been removed along with the
226 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
227 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
228 when libc.so is issued directly.
230 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
232 The following bugs are resolved with this release:
234 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
235 return different result with versioned "foo"
236 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
238 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
239 ./exe and ld.so adjusts argv on the stack
240 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
242 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
243 consuming the second byte of certain double byte characters
244 [25812] stdio: Libio vtable protection is sometimes only partially
246 [27054] libc: pthread_atfork handlers that call pthread_atfork
248 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
250 [28128] build: declare_symbol_alias doesn't work for assembly codes
251 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
252 [28752] nss: Segfault in getpwuid when stat fails
253 [28815] libc: realpath should not copy to resolved buffer on error
254 [28828] stdio: fputwc crashes
255 [28838] libc: FAIL: elf/tst-p_align3
256 [28845] locale: ld-monetary.c should be updated to match ISO C and
258 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
260 [28852] libc: getaddrinfo leaks memory with AI_ALL
261 [28853] libc: tst-spawn6 changes current foreground process group
262 (breaks test isolation)
263 [28857] libc: FAIL: elf/tst-audit24a
264 [28860] build: --enable-kernel=5.1.0 build fails because of missing
265 __convert_scm_timestamps
266 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
267 inaccurate without /sys and /proc
268 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
270 [28880] libc: Program crashes if date beyone 2038
271 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
272 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
273 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
274 rtm variants when avoiding overflow
275 [28922] build: The .d dependency files aren't always generated
276 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
278 [28936] build: nm: No such file
279 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
280 [28953] nss: NSS lookup result can be incorrect if function lookup
282 [28970] math: benchtest: libmvec benchmark doesn't build with make
284 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
285 /sys/devices/system/cpu/possible
286 [28993] libc: closefrom() iterates until max int if no access to
288 [28996] libc: realpath fails to copy partial result to resolved buffer
290 [29027] math: [ia64] fabs fails with sNAN input
291 [29029] nptl: poll() spuriously returns EINTR during thread
292 cancellation and with cancellation disabled
293 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
294 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
295 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
296 is promoted to global scope
297 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
298 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
299 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
301 [29097] time: fchmodat does not handle 64 bit time_t for
303 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
305 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
306 [29162] string: [PATCH] string.h syntactic error:
307 include/bits/string_fortified.h:110: error: expected ',' or ';'
308 before '__fortified_attr_access'
309 [29165] libc: [Regression] broken argv adjustment
310 [29187] dynamic-link: [regression] broken argv adjustment for nios2
311 [29193] math: sincos produces a different output than sin/cos
312 [29197] string: __strncpy_power9() uses uninitialised register vs18
313 value for filling after \0
314 [29203] libc: daemon is not y2038 aware
315 [29204] libc: getusershell is not 2038 aware
316 [29207] libc: posix_fallocate fallback implementation is not y2038
318 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
319 [29209] libc: isfdtype is not y2038 aware
320 [29210] network: ruserpass is not y2038 aware
321 [29211] libc: __open_catalog is not y2038 aware
322 [29213] libc: gconv_parseconfdir is not y2038 aware
323 [29214] nptl: pthread_setcanceltype fails to set type
324 [29225] network: Mistyped define statement in socket/sys/socket.h in
326 [29274] nptl: __read_chk is not a cancellation point
327 [29279] libc: undefined reference to `mbstowcs_chk' after
328 464d189b9622932a75302290625de84931656ec0
329 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
330 correct for !__ASSUME_TIME64_SYSCALLS
331 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
332 missing on microblaze with largefile
338 * Unicode 14.0.0 Support: Character encoding, character type info, and
339 transliteration tables are all updated to Unicode 14.0.0, using
340 generator scripts contributed by Mike FABIAN (Red Hat).
342 * Bump r_version in the debugger interface to 2 and add a new field,
343 r_next, support multiple namespaces.
345 * Support for the C.UTF-8 locale has been added to glibc. The locale
346 supports full code-point sorting for all valid Unicode code points. A
347 limitation in the framework for fnmatch, regexec, and regcomp requires
348 a compromise to save space and only ASCII-based range expressions are
349 supported for now (see bug 28255). The full size of the locale is
350 only ~400KiB, with 346KiB coming from LC_CTYPE information for
351 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
352 in various downstream distributions. The locale is not built into
353 glibc, and must be installed.
355 * <math.h> functions that round their results to a narrower type, and
356 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
357 18661-3:2015 and draft ISO C2X:
359 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
360 fMxsqrtfN and fMxsqrtfNx functions.
362 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
365 * <math.h> functions for floating-point maximum and minimum,
366 corresponding to new operations in IEEE 754-2019, and corresponding
367 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
368 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
369 fminimum_mag, fminimum_mag_num and corresponding functions for float,
370 long double, _FloatN and _FloatNx.
372 * <math.h> macros for single-precision float constants are added as a
373 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
374 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
377 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
378 predefined as specified in TS 18661-1:2014.
380 * The exp10 functions in <math.h> now have a corresponding type-generic
383 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
385 * printf-family functions now support the %b format for output of
386 integers in binary, as specified in draft ISO C2X, and the %B variant
387 of that format recommended by draft ISO C2X.
389 * A new DSO sorting algorithm has been added in the dynamic linker that uses
390 topological sorting by depth-first search (DFS), solving performance issues
391 of the existing sorting algorithm when encountering particular circular
392 object dependency cases.
394 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
395 the two DSO sorting algorithms. The default setting of '2' uses the
396 new DFS-based algorithm. The setting '1' switches to the old
397 algorithm used in glibc 2.33 and earlier.
399 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
400 to be used by compilers for optimizing usage of 'memcmp' when its
401 return value is only used for its boolean status.
403 * Support for automatically registering threads with the Linux rseq
404 system call has been added. This system call is implemented starting
405 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
406 operations on per-cpu data. It allows user-space to perform updates
407 on per-cpu data without requiring heavy-weight atomic operations.
408 Automatically registering threads allows all libraries, including
409 libc, to make immediate use of the rseq support by using the
410 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
411 variables. The GNU C Library manual has details on integration of
412 Restartable Sequences.
414 * A symbolic link to the dynamic linker is now installed under
415 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
417 * All programs and the testsuite in glibc are now built as position independent
418 executables (PIE) by default on toolchains and architectures that support it.
419 Further, if the toolchain and architecture supports it, even static programs
420 are built as PIE and the resultant glibc can be used to build static PIE
421 executables. A new option --disable-default-pie has been added to disable
422 this behavior and get a non-PIE build. This option replaces
423 --enable-static-pie, which no longer has any effect on the build
426 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
427 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
428 or to use huge pages directly with mmap calls with the MAP_HUGETLB
429 flags). The former can improve performance when Transparent Huge Pages
430 is set to 'madvise' mode while the latter uses the system reserved
433 * The printf family of functions now handles the flagged %#m conversion
434 specifier, printing errno as an error constant (similar to strerrorname_np).
436 * The function _dl_find_object has been added. In-process unwinders
437 can use it to efficiently locate unwinding information for a code
440 * Support for OpenRISC running on Linux has been added. This port requires
441 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
446 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
447 64-bit file offsets (LFS default).
449 * A new configure option, --with-rtld-early-cflags, can be used to
450 specify additional compiler flags for building the early startup code
451 of the dynamic linker. On targets which have CPU compatibility
452 checks, this can help to ensure that proper diagnostics are printed if
453 the dynamic loader runs on an incompatible CPU.
455 * On Linux, the epoll_pwait2 function has been added. It is similar to
456 epoll_wait with the difference the timeout has nanoseconds resolution.
458 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
459 enabling posix_spawn and posix_spawnp to set the controlling terminal in
460 the new process in a race free manner. This function is a GNU extension.
462 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
463 applications compiling with glibc and gcc 12 and later. Level 3 leverages
464 the __builtin_dynamic_object_size function to deliver additional
465 fortification balanced against additional runtime cost (checking non-constant
468 * The audit libraries will avoid unnecessary slowdown if it is not required
469 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
471 Deprecated and removed features, and other changes affecting compatibility:
473 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
474 has been removed since the first PT_LOAD segment is no longer executable
475 due to defaulting to -z separate-code.
477 * The r_version update in the debugger interface makes the glibc binary
478 incompatible with GDB binaries built without the following commits:
480 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
481 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
483 when audit modules or dlmopen are used.
485 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
487 * The --enable-static-pie option is no longer available. The glibc build
488 configuration script now automatically detects static-pie support in the
489 toolchain and architecture and enables it if available.
491 * The catchsegv script and associated libSegFault.so shared object have
492 been removed. There are widely-deployed out-of-process alternatives for
493 catching coredumps and backtraces.
495 * Support for prelink will be removed in the next release; this includes
496 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
497 variables and their functionality in the dynamic loader.
499 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
500 functionality to obtain the program mapping address can be achieved by
501 using LD_TRACE_LOADED_OBJECTS to value of 2.
503 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
504 support prelink PIE binaries.
506 Changes to build and runtime requirements:
508 * The audit module interface version LAV_CURRENT is increased to enable
509 proper bind-now support. The loader now advertises via the la_symbind
510 flags that PLT trace is not possible. New audit modules require the
511 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
512 modules are still loaded for all targets except aarch64.
514 * The audit interface on aarch64 is extended to support both the indirect
515 result location register (x8) and NEON Q register. Old audit modules are
516 rejected by the loader. Audit modules must be rebuilt to use the newer
517 structure sizes and the latest module interface version for LAV_CURRENT.
519 Security related changes:
521 CVE-2022-23219: Passing an overlong file name to the clnt_create
522 legacy function could result in a stack-based buffer overflow when
523 using the "unix" protocol. Reported by Martin Sebor.
525 CVE-2022-23218: Passing an overlong file name to the svcunix_create
526 legacy function could result in a stack-based buffer overflow.
528 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
529 function could result in a memory leak and potential access of
530 uninitialized memory. Reported by Qualys.
532 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
533 function may result in an off-by-one buffer underflow and overflow
534 when the current working directory is longer than PATH_MAX and also
535 corresponds to the / directory through an unprivileged mount
536 namespace. Reported by Qualys.
538 The following bugs are resolved with this release:
540 [12889] nptl: Race condition in pthread_kill
541 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
542 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
543 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
545 [15333] libc: Use 64-bit stat functions in installed programs
546 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
548 [15971] dynamic-link: No interface for debugger access to libraries
550 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
551 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
552 deeply nested DSO dependencies.
553 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
554 ID whose lifetime has not ended
555 [22542] network: buffer overflow in sunrpc clnt_create
557 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
559 [25947] malloc: memory leak in muntrace
560 [26045] math: fmaxf(inf, nan) does not always work
561 [26108] math: exp10() has problems with <tgmath.h>
562 [26779] build: benign use after realloc at localealias.c:329
563 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
564 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
565 [27945] build: build-many-glibcs.py doesn't configure GCC with
566 --enable-initfini-array
567 [27991] build: x86: sysdeps/x86/configure.ac breaks when
568 libc_cv_include_x86_isa_level is loaded from cache
569 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
570 in __REDIRECT_NTH macro
571 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
572 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
574 [28126] libc: nftw aborts for paths longer than PATH_MAX
575 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
576 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
578 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
579 [28185] math: Inaccurate j0f function (again)
580 [28199] locale: iconvconfig prefix flag behaves differently in glibc
582 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
583 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
585 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
586 [28223] libc: mips: clone does not align stack
587 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
589 [28256] malloc: Conditional jump or move depends on uninitialised
590 value(s) in __GI___tunables_init
591 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
592 spawn5 fail if stray fds are open
593 [28310] libc: Do not use affinity mask for sysconf
594 (_SC_NPROCESSORS_CONF)
595 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
597 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
599 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
600 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
602 [28353] network: Race condition on __opensock
603 [28357] dynamic-link: deadlock between pthread_create and ctors
604 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
605 [28361] nptl: Fix for bug 12889 causes setxid deadlock
606 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
607 [28390] localedata: Update locale data to Unicode 14.0.0
608 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
610 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
612 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
613 to tgkill (getpid (), gettid())
614 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
615 [28457] dynamic-link: Missing reldepmod4.so dependency for
617 [28469] time: linux: struct timex is not correctly set for 32-bit
618 systems with TIMESIZE=64
619 [28470] regex: Buffer read overrun in regular expression searching
620 [28475] string: Incorrect access attribute on memfrob
621 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
622 spurious NUL character on state reset
623 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
625 [28550] dynamic-link: FAIL: tst-dso-
626 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
628 [28554] build: Undefined generate-md5
629 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
631 [28607] nptl: Masked signals are delivered on thread exit
632 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
633 lack of cpu counting /proc fallback with glibc 2.34
634 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
635 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
636 [28648] dynamic-link: Running ld.so on statically linked binaries
638 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
640 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
641 [28678] nptl: nptl/tst-create1 hangs sporadically
642 [28688] dynamic-link: PT_LOAD p_align check is too strict
643 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
645 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
646 timezones generated by tzcode-2021d and later
647 [28713] math: GCC 12 miscompiles libm
648 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
649 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
650 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
651 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
652 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
653 Assertion `GL(dl_rtld_map).l_libname' failed!
654 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
655 [28757] nptl: GDB printer tests failed with new GDB
656 [28765] math: x86_64 libmvec atan2 accuracy
657 [28766] manual: Document libmvec accuracy
658 [28768] network: Buffer overflow in svcunix_create with long pathnames
660 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
662 [28770] libc: Unexpected return value from realpath() for too long
663 results (CVE-2021-3998)
664 [28771] libc: %ebx optimization macros are incompatible with .altmacro
666 [28780] build: --disable-default-pie doesn't work on static programs
667 [28782] libc: x86-64 ISA level for glibc itself is always
669 [28792] glob: possible wrong behaviour with patterns with double [
671 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
672 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
673 empty mon_decimal_point_wc
680 * In order to support smoother in-place-upgrades and to simplify
681 the implementation of the runtime all functionality formerly
682 implemented in the libraries libpthread, libdl, libutil, libanl has
683 been integrated into libc. New applications do not need to link with
684 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
685 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
686 provided, so that the linker options keep working. Applications which
687 have been linked against glibc 2.33 or earlier continue to load the
688 corresponding shared objects (which are now empty). The integration
689 of those libraries into libc means that additional symbols become
690 available by default. This can cause applications that contain weak
691 references to take unexpected code paths that would only have been
692 used in previous glibc versions when e.g. preloading libpthread.so.0,
693 potentially exposing application bugs.
695 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
696 PTHREAD_STACK_MIN is no longer constant and is redefined to
697 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
698 sets for modern architectural features like Arm SVE.
700 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
701 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
702 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
703 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
704 dynamic sized register sets for modern architectural features like
707 * The dynamic linker implements the --list-diagnostics option, printing
708 a dump of information related to IFUNC resolver operation and
709 glibc-hwcaps subdirectory selection.
711 * On Linux, the function execveat has been added. It operates similar to
712 execve and it is is already used to implement fexecve without requiring
713 /proc to be mounted. However, different than fexecve, if the syscall is not
714 supported by the kernel an error is returned instead of trying a fallback.
716 * The ISO C2X function timespec_getres has been added.
718 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
719 C2X, is supported to enable declarations of functions defined in Annex F
720 of C2X. Those declarations are also enabled when
721 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
722 defined, and when _GNU_SOURCE is defined.
724 * On powerpc64*, glibc can now be compiled without scv support using the
725 --disable-scv configure option.
727 * Add support for 64-bit time_t on configurations like x86 where time_t
728 is traditionally 32-bit. Although time_t still defaults to 32-bit on
729 these configurations, this default may change in future versions.
730 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
731 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
732 only enabled for Linux and the full support requires a minimum kernel
735 * The main gconv-modules file in glibc now contains only a small set of
736 essential converter modules and the rest have been moved into a supplementary
737 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
738 in the same GCONV_PATH. Similarly, external converter modules directories
739 may have supplementary configuration files in a gconv-modules.d directory
740 with names ending with .conf to logically classify the converter modules in
743 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
744 to configure the size of the thread stack cache.
746 * The function _Fork has been added as an async-signal-safe fork replacement
747 since Austin Group issue 62 droped the async-signal-safe requirement for
748 fork (and it will be included in the future POSIX standard). The new _Fork
749 function does not run any atfork function neither resets any internal state
750 or lock (such as the malloc one), and only sets up a minimal state required
751 to call async-signal-safe functions (such as raise or execve). This function
752 is currently a GNU extension.
754 * On Linux, the close_range function has been added. It allows efficiently
755 closing a range of file descriptors on recent kernels (version 5.9).
757 * The function closefrom has been added. It closes all file descriptors
758 greater than or equal to a given integer. This function is a GNU extension,
759 although it is also present in other systems.
761 * The posix_spawn_file_actions_addclosefrom_np function has been added,
762 enabling posix_spawn and posix_spawnp to close all file descriptors greater
763 than or equal to a given integer. This function is a GNU extension,
764 although Solaris also provides a similar function.
766 * When invoked explicitly, the dynamic linker now uses the kernel to
767 execute programs that do not have any dynamic dependency (that is,
768 they are statically linked). This feature is Linux-specific.
770 Deprecated and removed features, and other changes affecting compatibility:
772 * The function pthread_mutex_consistent_np has been deprecated; programs
773 should use the equivalent standard function pthread_mutex_consistent
776 * The function pthread_mutexattr_getrobust_np has been deprecated;
777 programs should use the equivalent standard function
778 pthread_mutexattr_getrobust instead.
780 * The function pthread_mutexattr_setrobust_np has been deprecated;
781 programs should use the equivalent standard function
782 pthread_mutexattr_setrobust instead.
784 * The function pthread_yield has been deprecated; programs should use
785 the equivalent standard function sched_yield instead.
787 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
789 * Various rarely-used functions declared in <resolv.h> and
790 <arpa/nameser.h> have been deprecated. Applications are encouraged to
791 use dedicated DNS processing libraries if applicable. For <resolv.h>,
792 this affects the functions dn_count_labels, fp_nquery, fp_query,
793 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
794 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
795 p_type, putlong, putshort, res_hostalias, res_isourserver,
796 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
797 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
798 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
799 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
801 * Various symbols previously defined in libresolv have been moved to libc
802 in order to prepare for libresolv moving entirely into libc (see earlier
803 entry for merging libraries into libc). The symbols __dn_comp,
804 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
805 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
806 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
807 __res_search, __res_send formerly in libresolv have been renamed and no
808 longer have a __ prefix. They are now available in libc.
810 * The pthread cancellation handler is now installed with SA_RESTART and
811 pthread_cancel will always send the internal SIGCANCEL on a cancellation
812 request. It should not be visible to applications since the cancellation
813 handler should either act upon cancellation (if asynchronous cancellation
814 is enabled) or ignore the cancellation internal signal. However there are
815 buggy kernel interfaces (for instance some CIFS versions) that could still
816 see a spurious EINTR error when cancellation interrupts a blocking syscall.
818 * Previously, glibc installed its various shared objects under versioned
819 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
820 were provided as symbolic links. Starting with glibc 2.34, the shared
821 objects are installed under their ABI sonames directly, without
822 symbolic links. This increases compatibility with distribution
823 package managers that delete removed files late during the package
824 upgrade or downgrade process.
826 * The symbols mallwatch and tr_break are now deprecated and no longer used in
827 mtrace. Similar functionality can be achieved by using conditional
828 breakpoints within mtrace functions from within gdb.
830 * The __morecore and __after_morecore_hook malloc hooks and the default
831 implementation __default_morecore have been removed from the API. Existing
832 applications will continue to link against these symbols but the interfaces
833 no longer have any effect on malloc.
835 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
836 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
837 disabled by default in the main C library. Users looking to use these
838 features now need to preload a new debugging DSO libc_malloc_debug.so to get
839 this functionality back.
841 * The deprecated functions malloc_get_state and malloc_set_state have been
842 moved from the core C library into libc_malloc_debug.so. Legacy applications
843 that still use these functions will now need to preload libc_malloc_debug.so
844 in their environment using the LD_PRELOAD environment variable.
846 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
847 __memalign_hook and __free_hook are now removed from the API. Compatibility
848 symbols are present to support legacy programs but new applications can no
849 longer link to these symbols. These hooks no longer have any effect on glibc
850 functionality. The malloc debugging DSO libc_malloc_debug.so currently
851 supports hooks and can be preloaded to get this functionality back for older
852 programs. However this is a transitional measure and may be removed in a
853 future release of the GNU C Library. Users may port away from these hooks by
854 writing and preloading their own malloc interposition library.
856 Changes to build and runtime requirements:
858 * On Linux, the shm_open, sem_open, and related functions now expect the
859 file shared memory file system to be mounted at /dev/shm. These functions
860 no longer search among the system's mount points for a suitable
861 replacement if /dev/shm is not available.
863 Security related changes:
865 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
866 a request for netgroup lookup, may crash due to a double-free,
867 potentially resulting in degraded service or Denial of Service on the
868 local system. Reported by Chris Schanzle.
870 CVE-2021-33574: The mq_notify function has a potential use-after-free
871 issue when using a notification type of SIGEV_THREAD and a thread
872 attribute with a non-default affinity mask.
874 CVE-2021-35942: The wordexp function may overflow the positional
875 parameter number when processing the expansion resulting in a crash.
876 Reported by Philippe Antoine.
878 The following bugs are resolved with this release:
880 [4737] libc: fork is not async-signal-safe
881 [5781] math: Slow dbl-64 sin/cos/sincos for special values
882 [10353] libc: Methods for deleting all file descriptors greater than
883 given integer (closefrom)
884 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
885 name containing multi-byte character(s)
886 [14469] math: Inaccurate j0f function
887 [14470] math: Inaccurate j1f function
888 [14471] math: Inaccurate y0f function
889 [14472] math: Inaccurate y1f function
890 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
892 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
893 crashes if it fails dlsym() twice
894 [15648] nptl: multiple definition of `__lll_lock_wait_private'
895 [16063] nptl: Provide a pthread_once variant in libc directly
896 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
897 [17145] libc: syslog with LOG_CONS leaks console file descriptor
898 [17183] manual: description of ENTRY struct in <search.h> in glibc
900 [18435] nptl: pthread_once hangs when init routine throws an exception
901 [18524] nptl: Missing calloc error checking in
902 __cxa_thread_atexit_impl
903 [19329] dynamic-link: dl-tls.c assert failure at concurrent
904 pthread_create and dlopen
905 [19366] nptl: returning from a thread should disable cancellation
906 [19511] nptl: 8MB memory leak in pthread_create in case of failure
907 when non-root user changes priority
908 [20802] dynamic-link: getauxval NULL pointer dereference after static
910 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
911 [22057] malloc: malloc_usable_size is broken with mcheck
912 [22668] locale: LC_COLLATE: the last character of ellipsis is not
914 [23323] libc: [RFE] CSU startup hardening.
915 [23328] malloc: Remove malloc hooks and ensure related APIs return no
917 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
918 $PLATFORM, $ORIGIN) crashes
919 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
920 [23554] nptl: pthread_getattr_np reports wrong stack size with
922 [24106] libc: Bash interpreter in ldd script is taken from host
923 [24773] dynamic-link: dlerror in an secondary namespace does not use
924 the right free implementation
925 [25036] localedata: Update collation order for Swedish
926 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
927 shm_open to pick wrong directory
928 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
929 crash in IFUNC resolver due to stack canary (--enable-stack-
931 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
932 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
933 [27111] dynamic-link: pthread_create and tls access use link_map
934 objects that may be concurrently freed by dlclose
935 [27132] malloc: memusagestat is linked to system librt, leading to
936 undefined symbols on major version upgrade
937 [27136] dynamic-link: dtv setup at thread creation may leave an entry
939 [27249] libc: libSegFault.so does not output signal number properly
940 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
942 [27318] dynamic-link: glibc fails to load binaries when built with
943 -march=sandybridge: CPU ISA level is lower than required
944 [27343] nss: initgroups() SIGSEGVs when called on a system without
945 nsswich.conf (in a chroot)
946 [27346] dynamic-link: x86: PTWRITE feature check is missing
947 [27389] network: NSS chroot hardening causes regressions in chroot
949 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
950 [27444] libc: sysconf reports unsupported option (-1) for
951 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
952 [27462] nscd: double-free in nscd (CVE-2021-27645)
953 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
954 malloc/tst-malloc-thread-fail
955 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
956 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
958 [27522] glob: glob, glob64 incorrectly marked as __THROW
959 [27555] dynamic-link: Static tests fail with --enable-stack-
961 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
962 information for the current directory
963 [27577] dynamic-link: elf/ld.so --help doesn't work
964 [27605] libc: tunables can't control xsave/xsavec selection in
966 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
967 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
969 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
970 _nss_files_getcanonname_r) from within a dlmopen namespace.
971 [27648] libc: FAIL: misc/tst-select
972 [27650] stdio: vfscanf returns too early if a match is longer than
974 [27651] libc: Performance regression after updating to 2.33
975 [27655] string: Wrong size calculation in string/test-strnlen.c
976 [27706] libc: select fails to update timeout on error
977 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
978 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
979 tries resolving them lazily
980 [27744] nptl: Support different libpthread/ld.so load orders in
982 [27749] libc: Data race __run_exit_handlers
983 [27761] libc: getconf: Segmentation fault when passing '-vq' as
985 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
986 exceeds maximum object size 2147483647
987 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
989 [27872] build: Obsolete configure option --enable-stackguard-
991 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
992 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
993 [27892] libc: powerpc: scv ABI error handling fails to check
995 [27896] nptl: mq_notify does not handle separately allocated thread
996 attributes (CVE-2021-33574)
997 [27901] libc: TEST_STACK_ALIGN doesn't work
998 [27902] libc: The x86-64 clone wrapper fails to align child stack
999 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1000 [27939] libc: aarch64: clone does not align the stack
1001 [27968] libc: s390x: clone does not align the stack
1002 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1003 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1004 with n >= 0x80000000
1005 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1006 thread never allocated anything
1007 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1008 [28064] string: x86_64:wcslen implementation list has wcsnlen
1009 [28067] libc: FAIL: posix/tst-spawn5
1010 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1011 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1013 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1014 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1015 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1017 [28091] network: ns_name_skip may return 0 for domain names without
1025 * The dynamic linker accepts the --list-tunables argument which prints
1026 all the supported tunables. This option is disable if glibc is
1027 configured with tunables disabled (--enable-tunables=no).
1029 * The dynamic linker accepts the --argv0 argument and provides opportunity
1030 to change argv[0] string.
1032 * The dynamic linker loads optimized implementations of shared objects
1033 from subdirectories under the glibc-hwcaps directory on the library
1034 search path if the system's capabilities meet the requirements for
1035 that subdirectory. Initially supported subdirectories include
1036 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1037 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1038 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1039 subdirectory names correspond to the vendor-independent x86-64
1040 microarchitecture levels defined in the x86-64 psABI supplement.
1042 * The new --help option of the dynamic linker provides usage and
1043 information and library search path diagnostics.
1045 * The mallinfo2 function is added to report statistics as per mallinfo,
1046 but with larger field widths to accurately report values that are
1047 larger than fit in an integer.
1049 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1051 * Support for the RISC-V ISA running on Linux has been expanded to run on
1052 32-bit hardware. This is supported for the following ISA and ABI pairs:
1058 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1061 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1062 glibc may use additional checks that may have an additional performance
1063 overhead. At present these checks are available only on LLVM 9 and later.
1064 The latest GCC available at this time (10.2) does not support this level of
1067 Deprecated and removed features, and other changes affecting compatibility:
1069 * The mallinfo function is marked deprecated. Callers should call
1072 * When dlopen is used in statically linked programs, alternative library
1073 implementations from HWCAP subdirectories are no longer loaded.
1074 Instead, the default implementation is used.
1076 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1077 removed. To support old binaries, the vtimes function continues to exist
1078 as a compatibility symbol. Applications should use the getrlimit or
1081 * Following a change in the tzdata 2018a release upstream, the zdump
1082 program is now installed in the /usr/bin subdirectory. Previously,
1083 the /usr/sbin subdirectory was used.
1085 * On s390(x), the type float_t is now derived from the macro
1086 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1087 hardcoded to double. This does not affect the ABI of any libraries
1088 that are part of the GNU C Library, but may affect the ABI of other
1089 libraries that use this type in their interfaces. The new definition
1090 improves consistency with compiler behavior in many scenarios.
1092 * A future version of glibc will stop loading shared objects from the
1093 "tls" subdirectories on the library search path, the subdirectory that
1094 corresponds to the AT_PLATFORM system name, and also stop employing
1095 the legacy AT_HWCAP search mechanism. Applications should switch to
1096 the new glibc-hwcaps mechanism instead; if they do not do that, only
1097 the baseline version (directly from the search path directory) will be
1100 Changes to build and runtime requirements:
1102 * On Linux, the system administrator needs to configure /dev/pts with
1103 the intended access modes for pseudo-terminals. glibc no longer
1104 attemps to adjust permissions of terminal devices. The previous glibc
1105 defaults ("tty" group, user read/write and group write) already
1106 corresponded to what most systems used, so that grantpt did not
1107 perform any adjustments.
1109 * On Linux, the posix_openpt and getpt functions no longer attempt to
1110 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1111 (and pseudo-terminals are supported), a devpts file system is mounted
1112 on /dev/pts. Current systems already meet these requirements.
1114 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1116 Security related changes:
1118 CVE-2021-3326: An assertion failure during conversion from the
1119 ISO-20220-JP-3 character set using the iconv function has been fixed.
1120 This assertion was triggered by certain valid inputs in which the
1121 converted output contains a combined sequence of two wide characters
1122 crossing a buffer boundary. Reported by Tavis Ormandy.
1124 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1125 invoked with input containing redundant shift sequences in the IBM1364,
1126 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1128 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1129 when invoked with UCS4 input containing an invalid character.
1131 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1132 invoked with EUC-KR input containing invalid multibyte input sequences.
1134 The following bugs are resolved with this release:
1136 [10635] libc: realpath portability patches
1137 [16124] dynamic-link: ld.so should allow to change argv[0]
1138 [17924] malloc: 'free' should not set errno
1139 [18683] libc: Linux faccessat implementation can incorrectly ignore
1141 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1142 [23091] hurd: missing waitid support
1143 [23249] libc: Epyc and other current AMD CPUs do not select the
1144 "haswell" platform subdirectory
1145 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1147 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1149 [24941] libc: Make grantpt usable after multi-threaded fork in more
1151 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1152 [24973] locale: iconv encounters segmentation fault when converting
1153 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1154 [25399] string: undefined reference to `__warn_memset_zero_len' when
1155 changing gnuc version
1156 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1158 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1160 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1161 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1162 [26100] libc: Race in syslog(3) with regards to tag printing.
1163 [26124] libc: Export <cpu-features.h>
1164 [26130] nscd: Inconsistent nscd cache during pruning
1165 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1166 [26224] locale: iconv hangs when converting some invalid inputs from
1167 several IBM character sets (CVE-2020-27618)
1168 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1169 too much stack space
1170 [26343] manual: invalid documented return type for strerrorname_np(),
1171 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1172 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1174 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1176 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1177 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1179 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1180 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1181 [26555] string: strerrorname_np does not return the documented value
1182 [26592] libc: pointer arithmetic overflows in realpath
1183 [26600] network: Transaction ID collisions cause slow DNS lookups in
1185 [26606] libc: [2.33 Regression] pselect is broken on x32
1186 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1187 [26620] glob: fnmatch with collating symbols results in segmentation
1189 [26625] libc: [2.33 Regression] CET is disabled
1190 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1191 at the end of a memory mapping
1192 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1193 by the caller to the kernel
1194 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1195 [26647] build: [-Werror=array-parameter=] due to different
1196 declarations for __sigsetjmp
1197 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1199 [26649] stdio: printf should handle non-normal x86 long double numbers
1200 gracefully (CVE-2020-29573)
1201 [26686] build: -Warray-parameter instances building with GCC 11
1202 [26687] build: -Warray-bounds instances building with GCC 11
1203 [26690] stdio: Aliasing violation in __vfscanf_internal
1204 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1205 [26726] build: GCC warning calling new_composite_name with an array of
1207 [26736] libc: FAIL: misc/tst-sysvshm-linux
1208 [26737] libc: Random FAIL: rt/tst-shm
1209 [26791] libc: Missing O_CLOEXEC in sysconf.c
1210 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1212 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1214 [26818] string: aarch64: string tests may run ifunc variants that are
1216 [26821] libc: Memory leak test failures on Fedora 33
1217 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1218 FSGSBASE/LM/RDRAND check failure
1219 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1221 [26853] libc: aarch64: Missing unwind information in statically linked
1223 [26923] locale: Assertion failure in iconv when converting invalid
1224 UCS4 (CVE-2020-29562)
1225 [26926] dynamic-link: aarch64: library dependencies are not bti
1227 [26932] libc: sh: Multiple floating point functions defined as stubs
1229 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1231 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1233 [27002] build: libc_freeres_fn build failure with GCC 11
1234 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1235 [27008] dynamic-link: ld.so.cache should have endianness markup
1236 [27042] libc: [alpha] anonymous union in struct stat confuses
1238 [27053] libc: Conformance regression in system(3) (and probably also
1240 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1242 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1243 [27083] libc: Unsafe unbounded alloca in addmntent
1244 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1246 [27130] string: "rep movsb" performance issue
1247 [27150] libc: alpha: wait4() is unavailable in static linking
1248 [27177] dynamic-link:
1249 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1251 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1252 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1253 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1254 related to combining characters (CVE-2021-3326)
1261 * Unicode 13.0.0 Support: Character encoding, character type info, and
1262 transliteration tables are all updated to Unicode 13.0.0, using
1263 generator scripts contributed by Mike FABIAN (Red Hat).
1265 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1267 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1268 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1269 Three ABIs are supported:
1275 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1276 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1278 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1279 DT_DEPAUDIT dynamic section entries of the main executable.
1281 * powerpc64le supports IEEE128 long double libm/libc redirects when
1282 using -mabi=ieeelongdouble to compile C code on supported GCC
1283 toolchains. It is recommended to use GCC 8 or newer when testing
1286 * To help detect buffer overflows and other out-of-bounds accesses
1287 several APIs have been annotated with GCC 'access' attribute. This
1288 should help GCC 10 issue better warnings.
1290 * On Linux, functions pthread_attr_setsigmask_np and
1291 pthread_attr_getsigmask_np have been added. They allow applications
1292 to specify the signal mask of a thread created with pthread_create.
1294 * The GNU C Library now provides the header file <sys/single_threaded.h>
1295 which declares the variable __libc_single_threaded. Applications are
1296 encouraged to use this variable for single-thread optimizations,
1297 instead of weak references to symbols historically defined in
1300 * The functions sigabbrev_np and sigdescr_np have been added. The
1301 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1302 SIGHUP) while sigdescr_np returns a string describing the signal number
1303 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1304 attempt to translate the return description, both functions return
1305 NULL for an invalid signal number.
1307 They should be used instead of sys_siglist or sys_sigabbrev and they
1308 are both thread and async-signal safe. These functions are GNU extensions.
1310 * The functions strerrorname_np and strerrordesc_np have been added. The
1311 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1312 while strerrordesc_np returns a string describing the error number
1313 (e.g "Invalid argument" for EINVAL). Different than strerror,
1314 strerrordesc_np does not attempt to translate the return description, both
1315 functions return NULL for an invalid error number.
1317 They should be used instead of sys_errlist and sys_nerr, both are
1318 thread and async-signal safe. These functions are GNU extensions.
1320 * AArch64 now supports standard branch protection security hardening
1321 in glibc when it is built with a GCC that is configured with
1322 --enable-standard-branch-protection (or if -mbranch-protection=standard
1323 flag is passed when building both GCC target libraries and glibc,
1324 in either case a custom GCC is needed). This includes branch target
1325 identification (BTI) and pointer authentication for return addresses
1326 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1327 extensions respectively for the protection to be effective,
1328 otherwise the used instructions are nops. User code can use PAC-RET
1329 without libc support, but BTI requires a libc that is built with BTI
1330 support, otherwise runtime objects linked into user code will not be
1333 Deprecated and removed features, and other changes affecting compatibility:
1335 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1336 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1337 RPC header files. Backward compatibility for old programs is kept
1338 only for architectures and ABIs that have been added in or before
1339 glibc 2.31. New programs need to use TI-RPC
1340 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1341 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1343 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1344 as shared library for backward compatibility and the NSS modules "nis"
1345 and "nisplus" are not built at all and libnsl's headers aren't
1346 installed. This compatibility is kept only for architectures and ABIs
1347 that have been added in or before version 2.28. Replacement
1348 implementations based on TI-RPC, which additionally support IPv6, are
1349 available from <https://github.com/thkukuk/>. This change does not
1350 affect the "compat" NSS module, which does not depend on libnsl
1351 since 2.27 and thus can be used without NIS.
1353 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1354 removed. To support old binaries, the sysctl function continues to
1355 exist as a compatibility symbol (on those architectures which had it),
1356 but always fails with ENOSYS. This reflects the removal of the system
1357 call from all architectures, starting with Linux 5.5.
1359 * The sstk function is no longer available to newly linked binaries.
1360 Its implementation always returned with a failure, and the function
1361 was not declared in any header file.
1363 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1364 sigrelse, sigignore and sigset, and the sigmask macro have been
1365 deprecated. Applications should use the sigsuspend, sigprocmask and
1366 sigaction functions instead.
1368 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1369 already supported this format for almost 20 years.
1371 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1372 are no longer available to newly linked binaries, and their declarations
1373 have been removed from <string.h>. They are exported solely as
1374 compatibility symbols to support old binaries. All programs should use
1377 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1378 are no longer available to newly linked binaries, and their declarations
1379 have been removed from <stdio.h>. They are exported solely as
1380 compatibility symbols to support old binaries. All programs should use
1381 strerror or strerror_r instead.
1383 * Both strerror and strerror_l now share the same internal buffer in the
1384 calling thread, meaning that the returned string pointer may be invalided
1385 or contents might be overwritten on subsequent calls in the same thread or
1386 if the thread is terminated. It makes strerror MT-safe.
1388 * Using weak references to libpthread functions such as pthread_create
1389 or pthread_key_create to detect the singled-threaded nature of a
1390 program is an obsolescent feature. Future versions of glibc will
1391 define pthread_create within libc.so.6 itself, so such checks will
1392 always flag the program as multi-threaded. Applications should check
1393 the __libc_single_threaded variable declared in
1394 <sys/single_threaded.h> instead.
1396 * The "files" NSS module no longer supports the "key" database (used for
1397 secure RPC). The contents of the /etc/publickey file will be ignored,
1398 regardless of the settings in /etc/nsswitch.conf. (This method of
1399 storing RPC keys only supported the obsolete and insecure AUTH_DES
1400 flavor of secure RPC.)
1402 * The __morecore and __after_morecore_hook malloc hooks and the default
1403 implementation __default_morecore have been deprecated. Applications
1404 should use malloc interposition to change malloc behavior, and mmap to
1405 allocate anonymous memory. A future version of glibc may require that
1406 applications which use the malloc hooks must preload a special shared
1407 object, to enable the hooks.
1409 * The hesiod NSS module has been deprecated and will be removed in a
1410 future version of glibc. System administrators are encouraged to
1411 switch to other approaches for networked account databases, such as
1414 Changes to build and runtime requirements:
1416 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1417 long double redirects.
1419 Security related changes:
1421 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1422 invoked with the -c option and when processing invalid multi-byte input
1423 sequences. Reported by Jan Engelhardt.
1425 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1426 corruption when they were passed a pseudo-zero argument. Reported by Guido
1427 Vranken / ForAllSecure Mayhem.
1429 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1430 expanding ~user has been fixed.
1432 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1433 memmove functions has been fixed. Discovered by Jason Royes and Samual
1434 Dytrych of the Cisco Security Assessment and Penetration Team (See
1437 The following bugs are resolved with this release:
1439 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1440 [10441] manual: Backtraces code example lacks error checking
1441 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1442 timer_sigev_thread dangerous
1443 [14231] stdio: stdio-common tests memory requirements
1444 [14578] libc: /proc-based emulation for lchmod, fchmodat
1445 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1446 filtee has constructor
1447 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1448 sequences (CVE-2016-10228)
1449 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1450 character entities for infinity & pi
1451 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1452 segfaults in applications
1453 [20543] libc: Please move from .gnu.linkonce to comdat
1454 [22489] network: gcc warns about implicit convertion in
1455 ICMP6_FILTER_SETPASS with -Wsign-conversion
1456 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1457 [23294] math: Complex _FloatN functions are redirected to the wrong
1458 function with -mlong-double-64
1459 [23296] libc: Data race in setting function descriptor during lazy
1461 [23668] dynamic-link: ldconfig: Default to the new format for
1463 [23819] hurd: hurd: Add C11 thread support
1464 [23990] build: test-container error out on failure to exec child.
1465 [23991] build: shell-container typo in run_command_array
1466 [24638] manual: Error in example of parsing a template string
1467 [24654] manual: Wrong declaration of wcschr in libc manual
1468 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1470 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1471 dynamically loaded dsos
1472 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1473 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1475 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1476 restore EAX, ECX and EDX
1477 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1478 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1479 [25420] network: Race condition in resolv_conf.c can result in caching
1480 stale configuration forever
1481 [25487] math: sinl() stack corruption from crafted input
1483 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1485 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1486 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1488 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1489 on 32 bit and old kernel
1490 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1491 [25639] localedata: Some names of days and months wrongly spelt in
1493 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1494 amount of sigset_t bytes
1495 [25691] stdio: printf: memory leak when printing long multibyte
1497 [25715] libc: system() returns wrong errors when posix_spawn fails
1498 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1499 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1500 state for conversions that produce two Unicode code points
1501 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1502 for linux x86_64 leads to livelock
1503 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1504 test failures, invalid instruction in ld.so
1505 [25790] glob: Typo in tst-fnmatch.input
1506 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1508 [25819] localedata: Update locale data to Unicode 13.0.0
1509 [25824] libc: Abnormal function of strnlen in aarch64
1510 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1511 [25896] libc: Incorrect prctl
1512 [25902] libc: Bad LOADARGS_N
1513 [25905] dynamic-link: VSX registers are corrupted during PLT
1514 resolution when glibc is built with --disable-multi-arch and --with-
1516 [25933] string: Off by one error in __strncmp_avx2 when
1517 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1519 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1520 exiting detached thread
1521 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1523 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1525 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1526 [26073] math: getpayload() has wrong return value
1527 [26076] dynamic-link: dlmopen crashes after failing to load
1528 dependencies in audit mode
1529 [26120] localedata: column width of of some Korean
1530 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1531 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1532 [26133] libc: Incorrect need_arch_feature_F16C
1533 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1535 [26149] libc: PKU is usable only if OSPKE is set
1536 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1538 [26208] libc: Incorrect bit_cpu_CLFSH
1539 [26210] network: Incorrect use of hidden symbols for global sunrpc
1541 [26211] stdio: printf integer overflow calculating allocation size
1542 [26214] stdio: printf_fp double free
1543 [26215] stdio: printf_fp memory leak
1544 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1545 [26258] nss: nss_compat should not read input files with mmap
1546 [26332] string: Incorrect cache line size load causes memory
1547 corruption in memset
1554 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1555 enable features from the draft ISO C2X standard. Only some features from
1556 this draft standard are supported by the GNU C Library, and as the draft
1557 is under active development, the set of features enabled by this macro is
1558 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1559 by compiling with "gcc -std=gnu2x".
1561 * The <math.h> functions that round their results to a narrower type now
1562 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1563 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1564 Clarification Request 13 to TS 18661-3.
1566 * The function pthread_clockjoin_np has been added, enabling join with a
1567 terminated thread with a specific clock. It allows waiting against
1568 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1570 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1572 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1573 in queries if the trust-ad option is set via the options directive in
1574 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1575 mode, the AD bit, as provided by the name server, is available to
1576 applications which call res_search and related functions. In the default
1577 mode, the AD bit is not set in queries, and it is automatically cleared in
1578 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1579 servers and the network path to them are treated as untrusted.)
1581 Deprecated and removed features, and other changes affecting compatibility:
1583 * The totalorder and totalordermag functions, and the corresponding
1584 functions for other floating-point types, now take pointer arguments to
1585 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1586 passing. This is in accordance with the resolution of Clarification
1587 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1588 floating-point arguments directly will continue to work.
1590 * The obsolete function stime is no longer available to newly linked
1591 binaries, and its declaration has been removed from <time.h>.
1592 Programs that set the system time should use clock_settime instead.
1594 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1595 in a future version of glibc. In this release, the header still exists
1596 but calling ftime will cause a compiler warning. All programs should use
1597 gettimeofday or clock_gettime instead.
1599 * The gettimeofday function no longer reports information about a
1600 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1601 many years, as it cannot handle the full complexity of the world's
1602 timezones, but hitherto we have supported it on a best-effort basis.
1603 Changes required to support 64-bit time_t on 32-bit architectures have
1604 made this no longer practical.
1606 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1607 should expect to receive a 'struct timezone' whose tz_minuteswest and
1608 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1609 happen on a few Linux-based ports. This will be corrected in a future
1612 All callers should supply a null pointer for the 'tzp' argument to
1613 gettimeofday. For accurate information about the time zone associated
1614 with the current time, use the localtime function.
1616 gettimeofday itself is obsolescent according to POSIX. We have no plans
1617 to remove access to this function, but portable programs should consider
1618 using clock_gettime instead.
1620 * The settimeofday function can still be used to set a system-wide time
1621 zone when the operating system supports it. This is because the Linux
1622 kernel reused the API, on some architectures, to describe a system-wide
1623 time-zone-like offset between the software clock maintained by the kernel,
1624 and the "RTC" clock that keeps time when the system is shut down.
1626 However, to reduce the odds of this offset being set by accident,
1627 settimeofday can no longer be used to set the time and the offset
1628 simultaneously. If both of its two arguments are non-null, the call
1629 will fail (setting errno to EINVAL).
1631 Callers attempting to set this offset should also be prepared for the call
1632 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1633 some Linux architectures. The Linux kernel maintainers are discussing a
1634 more principled replacement for the reused API. After a replacement
1635 becomes available, we will change settimeofday to fail with ENOSYS on all
1636 platforms when its 'tzp' argument is not a null pointer.
1638 settimeofday itself is obsolescent according to POSIX. Programs that set
1639 the system time should use clock_settime and/or the adjtime family of
1640 functions instead. We may cease to make settimeofday available to newly
1641 linked binaries after there is a replacement for Linux's time-zone-like
1644 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1645 the optional CAS instruction is implemented (for instance, LEON processors
1646 are still supported, but SuperSPARC processors are not).
1648 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1651 * If a lazy binding failure happens during dlopen, during the execution of
1652 an ELF constructor, the process is now terminated. Previously, the
1653 dynamic loader would return NULL from dlopen, with the lazy binding error
1654 captured in a dlerror message. In general, this is unsafe because
1655 resetting the stack in an arbitrary function call is not possible.
1657 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1658 executable stack unless explicitly configured at build time to require
1659 minimum kernel version 4.8 or newer. This is because executing
1660 floating-point branches on a non-executable stack on Linux kernels prior to
1661 4.8 can lead to application crashes for some MIPS configurations. While
1662 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1663 expected to enable non-executable stack by default with PT_GNU_STACK by
1664 default and is thus likely to trigger a crash on older kernels.
1666 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1667 non-executable stack while dropping support for older kernels.
1669 * System call wrappers for time system calls now use the new time64 system
1670 calls when available. On 32-bit targets, these wrappers attempt to call
1671 the new system calls first and fall back to the older 32-bit time system
1672 calls if they are not present. This may cause issues in environments
1673 that cannot handle unsupported system calls gracefully by returning
1674 -ENOSYS. Seccomp sandboxes are affected by this issue.
1676 Changes to build and runtime requirements:
1678 * It is no longer necessary to have recent Linux kernel headers to build
1679 working (non-stub) system call wrappers on all architectures except 64-bit
1680 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1682 * The ChangeLog file is no longer present in the toplevel directory of the
1683 source tree. ChangeLog files are located in the ChangeLog.old directory as
1684 ChangeLog.N where the highest N has the latest entries.
1686 Security related changes:
1688 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1689 out-of-bounds write when executed in a signal frame context.
1691 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1692 environment variable during program execution after a security
1693 transition, allowing local attackers to restrict the possible mapping
1694 addresses for loaded libraries and thus bypass ASLR for a setuid
1695 program. Reported by Marcin Kościelnicki.
1697 The following bugs are resolved with this release:
1699 [12031] localedata: iconv -t ascii//translit with Greek characters
1700 [15813] libc: Multiple issues in __gen_tempname
1701 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1702 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1703 [19767] libc: vdso is not used with static linking
1704 [19903] hurd: Shared mappings not being inherited by children processes
1705 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1706 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1708 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1709 Symbols-A/B Unicode blocks
1710 [23518] libc: Eliminate __libc_utmp_jump_table
1711 [24026] malloc: malloc_info() returns wrong numbers
1712 [24054] localedata: Many locales are missing date_fmt
1713 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1714 [24304] dynamic-link: Lazy binding failure during ELF
1715 constructors/destructors is not fatal
1716 [24376] libc: RISC-V symbol size confusion with _start
1717 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1719 [24824] libc: test-in-container does not install charmap files compatible
1721 [24844] regex: regex bad pointer / leakage if malloc fails
1722 [24867] malloc: Unintended malloc_info formatting changes
1723 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1724 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1725 [24882] libc: login: pututline uses potentially outdated cache
1726 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1727 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1729 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1731 [24930] dynamic-link: dlopen of PIE executable can result in
1732 _dl_allocate_tls_init assertion failure
1733 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1734 (stringop-overflow error)
1735 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1736 functions other can lead to crashes
1737 [24967] libc: jemalloc static linking causes runtime failure
1738 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1740 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1741 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1742 [25097] libc: new -Warray-bounds with GCC 10
1743 [25112] dynamic-link: dlopen must not make new objects accessible when it
1744 still can fail with an error
1745 [25139] localedata: Please add the new mnw_MM locale
1746 [25149] regex: Array bounds violation in proceed_next_node
1747 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1748 initialized correctly
1749 [25189] libc: glibc's __glibc_has_include causes issues with clang
1751 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1752 value to an unsigned
1753 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1754 binaries (CVE-2019-19126)
1755 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1757 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1759 [25232] string: <string.h> does not enable const correctness for strchr et
1761 [25233] localedata: Consider "." as the thousands separator for sl_SI
1763 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1764 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1765 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1767 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1768 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1770 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1771 (dl_initfirst) link map pointer
1772 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1773 [25423] libc: Array overflow in backtrace on powerpc
1774 [25425] network: Missing call to __resolv_context_put in
1775 getaddrinfo.c:gethosts
1782 * Unicode 12.1.0 Support: Character encoding, character type info, and
1783 transliteration tables are all updated to Unicode 12.1.0, using
1784 generator scripts contributed by Mike FABIAN (Red Hat).
1786 * The dynamic linker accepts the --preload argument to preload shared
1787 objects, in addition to the LD_PRELOAD environment variable.
1789 * The twalk_r function has been added. It is similar to the existing
1790 twalk function, but it passes an additional caller-supplied argument
1791 to the callback function.
1793 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1795 * Minguo (Republic of China) calendar support has been added as an
1796 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1799 * The entry for the new Japanese era has been added for ja_JP locale.
1801 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1802 pvalloc, memalign, and posix_memalign fail now with total object size
1803 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1804 pointer subtraction within the allocated object, where results might
1805 overflow the ptrdiff_t type.
1807 * The dynamic linker no longer refuses to load objects which reference
1808 versioned symbols whose implementation has moved to a different soname
1809 since the object has been linked. The old error message, symbol
1810 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1811 link time reference, is gone.
1813 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1814 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1815 functions. These behave similarly to their "timed" equivalents, but also
1816 accept a clockid_t parameter to determine which clock their timeout should
1817 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1818 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1819 time of the wait (unlike with pthread_condattr_setclock, which requires
1820 the clock choice at initialization time).
1822 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1823 work, new resolvers can use a second argument which can be extended in
1824 the future, currently it contains the AT_HWCAP2 value.
1826 Deprecated and removed features, and other changes affecting compatibility:
1828 * The copy_file_range function fails with ENOSYS if the kernel does not
1829 support the system call of the same name. Previously, user space
1830 emulation was performed, but its behavior did not match the kernel
1831 behavior, which was deemed too confusing. Applications which use the
1832 copy_file_range function can no longer rely on glibc to provide a fallback
1833 on kernels that do not support the copy_file_range system call, and if
1834 this function returns ENOSYS, they will need to use their own fallback.
1835 Support for copy_file_range for most architectures was added in version
1836 4.5 of the mainline Linux kernel.
1838 * The functions clock_gettime, clock_getres, clock_settime,
1839 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1840 for new applications (on architectures which had them). Instead, the
1841 definitions in libc will be used automatically, which have been available
1844 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1845 and <sys/stropts.h> have been removed.
1847 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1848 resolver flag (deprecated in glibc 2.25) have been removed.
1850 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1851 resolver have been removed from <resolv.h>.
1853 * With --enable-bind-now, installed programs are now linked with the
1856 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1857 configurations) has been removed, following the deprecation of this
1858 subarchitecture in version 8 of GCC, and its removal in version 9.
1860 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1861 header have been removed.
1863 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1864 deprecated and will be removed from a future version of glibc.
1865 Application should directly access /proc instead. For obtaining random
1866 bits, the getentropy function can be used.
1868 Changes to build and runtime requirements:
1870 * GCC 6.2 or later is required to build the GNU C Library.
1872 Older GCC versions and non-GNU compilers are still supported when
1873 compiling programs that use the GNU C Library.
1875 Security related changes:
1877 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1878 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1879 has undefined behavior. On x32, the size_t argument may be passed
1880 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1881 32 bits. When it happened with the sign bit of RDX register set,
1882 memcmp gave the wrong result since it treated the size argument as
1883 zero. Reported by H.J. Lu.
1885 CVE-2019-9169: Attempted case-insensitive regular-expression match
1886 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1887 over-read. Reported by Hongxu Chen.
1889 The following bugs are resolved with this release:
1891 [2872] locale: Transliteration Cyrillic -> ASCII fails
1892 [6399] libc: gettid() should have a wrapper
1893 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1894 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1895 [17396] localedata: globbing for locale by [[.collating-element.]]
1896 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1897 [18465] malloc: memusagestat is built using system C library
1898 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1899 invalid input drops valid char
1900 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1901 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1902 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1903 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1904 [23352] malloc: __malloc_check_init still defined in public header
1906 [23403] nptl: Wrong alignment of TLS variables
1907 [23501] libc: nftw() doesn't return dangling symlink's inode
1908 [23733] malloc: Check the count before calling tcache_get()
1909 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1911 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1912 [23844] nptl: pthread_rwlock_trywrlock results in hang
1913 [23983] argparse: Missing compat versions of argp_failure and argp_error
1914 for long double = double
1915 [23984] libc: Missing compat versions of err.h and error.h functions for
1916 long double = double
1917 [23996] localedata: Dutch salutations
1918 [24040] libc: riscv64: unterminated call chain in __thread_start
1919 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1921 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1922 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1924 [24114] regex: regexec buffer read overrun in "grep -i
1925 '\(\(\)*.\)*\(\)\(\)\1'"
1926 [24122] libc: Segfaults if 0 returned from la_version
1927 [24153] stdio: Some input functions do not react to stdin assignment
1928 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1929 RDX is set) (CVE-2019-7309)
1930 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1931 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1932 not the default "nor"
1933 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1934 false positives, change to modern flexible array
1935 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1936 instructions while maintaining the robust mutex list due to missing
1938 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1939 unnecessary librt dependencies
1940 [24200] localedata: Revert first_weekday removal in en_IE locale
1941 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1942 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1943 [24216] malloc: Check for large bin list corruption when inserting
1945 [24228] stdio: old x86 applications that use legacy libio crash on exit
1946 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1948 [24293] localedata: Missing Minguo calendar support for TW locales
1949 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1950 tt_RU (Tatar) locale
1951 [24307] localedata: Update locale data to Unicode 12.0.0
1952 [24323] dynamic-link: dlopen should not be able open PIE objects
1953 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1954 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1955 tt_RU (Tatar) locale
1956 [24370] localedata: Add lang_name for tt_RU locale
1957 [24372] locale: Binary locale files are not architecture independent
1958 [24394] time: strptime %Ey mis-parses final year of era
1959 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1961 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1963 [24531] malloc: Malloc tunables give tcache assertion failures
1964 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1966 [24535] localedata: Update locale data to Unicode 12.1.0
1967 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1968 kernels and break testing
1969 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1970 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1971 [-Werror=format-overflow=]
1972 [24570] libc: alpha: compat msgctl uses __IPC_64
1973 [24584] locale: Data race in __wcsmbs_clone_conv
1974 [24588] stdio: Remove codecvt vtables from libio
1975 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1977 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1978 [24632] stdio: Old binaries which use freopen with default stdio handles
1980 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1982 [24652] localedata: szl_PL spelling correction
1983 [24695] nss: nss_db: calling getpwent after endpwent crashes
1984 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1985 in /etc/nsswitch.conf
1986 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1987 [24740] libc: getdents64 type confusion
1988 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1989 always implemented in the same library
1990 [24744] libc: Remove copy_file_range emulation
1991 [24757] malloc: memusagestat is linked against system libpthread
1992 [24794] libc: Partial test suite run builds corrupt test-in-container
2000 * The getcpu wrapper function has been added, which returns the currently
2001 used CPU and NUMA node. This function is Linux-specific.
2003 * A new convenience target has been added for distribution maintainers
2004 to build and install all locales as directories with files. The new
2005 target is run by issuing the following command in your build tree:
2006 'make localedata/install-locale-files', with an optional DESTDIR
2007 to set the install root if you wish to install into a non-default
2008 configured location.
2010 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2012 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2013 for _GNU_SOURCE, to match BSD environments.
2015 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2016 indicates that it will abort the transaction prior to entering the kernel
2017 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2018 suspended, and this caused some undefined side-effects issues by aborting
2019 transactions manually. Glibc avoided it by abort transactions manually on
2020 each syscall, but it lead to performance issues on newer kernels where the
2021 HTM state is saved and restore lazily (the state being saved even when the
2022 process actually does not use HTM).
2024 * The functions posix_spawn_file_actions_addchdir_np and
2025 posix_spawn_file_actions_addfchdir_np have been added, enabling
2026 posix_spawn and posix_spawnp to run the new process in a different
2027 directory. These functions are GNU extensions. The function
2028 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2031 * The popen and system do not run atfork handlers anymore (BZ#17490).
2032 Although it is a possible POSIX violation, the POSIX rationale in
2033 pthread_atfork documentation regarding atfork handlers is to handle
2034 inconsistent mutex state after a fork call in a multi-threaded process.
2035 In both popen and system there is no direct access to user-defined mutexes.
2037 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2038 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2040 - C-SKY ABIV2 soft-float little-endian
2041 - C-SKY ABIV2 hard-float little-endian
2043 * strftime's default formatting of a locale's alternative year (%Ey)
2044 has been changed to zero-pad the year to a minimum of two digits,
2045 like "%y". This improves the display of Japanese era years during
2046 the first nine years of a new era, and is expected to be harmless
2047 for all other locales (only Japanese locales regularly have
2048 alternative year numbers less than 10). Zero-padding can be
2049 overridden with the '_' or '-' flags (which are GNU extensions).
2051 * As a GNU extension, the '_' and '-' flags can now be applied to
2052 "%EY" to control how the year number is formatted; they have the
2053 same effect that they would on "%Ey".
2055 Deprecated and removed features, and other changes affecting compatibility:
2057 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2058 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2060 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2061 in <sys/procfs.h>, has been corrected to match the type actually used by
2062 the Linux kernel. This affects the size and layout of that structure on
2063 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2065 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2066 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2067 defined in <sys/procfs.h>, has been corrected to match the type actually
2068 used by the Linux kernel. This affects the size and layout of those
2071 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2072 meant to scan a string and allocate space for it with malloc, is now
2073 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2074 defined. This extension conflicts with C99's use of '%a' to scan a
2075 hexadecimal floating-point number, which is now available to programs
2076 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2078 POSIX.1-2008 includes the feature of allocating a buffer for string input
2079 with malloc, using the modifier letter 'm' instead. Programs using
2080 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2081 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2082 C99 '%a' no longer need to avoid _GNU_SOURCE.
2084 GCC's -Wformat warnings can detect most uses of this extension, as long
2085 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2086 __attribute__ ((format (scanf, ...))).
2088 Changes to build and runtime requirements:
2090 * Python 3.4 or later is required to build the GNU C Library.
2092 * On most architectures, GCC 5 or later is required to build the GNU C
2093 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2095 Older GCC versions and non-GNU compilers are still supported when
2096 compiling programs that use the GNU C Library.
2098 Security related changes:
2100 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2101 denial of service due to resource exhaustion when processing getaddrinfo
2102 calls with crafted host names. Reported by Guido Vranken.
2104 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2105 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2106 happened, accessing the 32-bit size_t value as the full 64-bit register
2107 in the assembly string/memory functions would cause a buffer overflow.
2108 Reported by H.J. Lu.
2110 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2111 addresses with arbitrary trailing characters, potentially leading to data
2112 or command injection issues in applications.
2114 The following bugs are resolved with this release:
2116 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2117 [10496] localedata: 12h time representation in multiple locales faulty
2118 [10797] localedata: it_IT locale numeric does not have a separator for
2120 [11319] libc: dprintf doesn't handle errors properly
2121 [16346] time: mktime: potentially unsafe use of localtime_offset
2122 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2124 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2125 posix_spawn_file_actions_addfchdir_np
2126 [17426] localedata: Indian locales: set the correct date format
2127 [17490] stdio: popen should not invoke atfork handlers
2128 [17783] libc: TIOCSER_TEMT conditions inconsistent
2129 [18040] regex: use-after-free in regexec/get_subexp
2130 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2131 [20018] network: getaddrinfo should reject IP addresses with trailing
2132 characters (CVE-2016-10739)
2133 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2134 [20271] libc: Missing "\n" in __libc_fatal calls
2135 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2136 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2137 pointer argument is non-NULL
2138 [21037] stdio: open_memstream and freopen
2139 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2140 [21716] time: Crash in glibc's mktime in low-memory situations
2141 [22834] stdio: Subprocess forked by popen may crash in Linux when
2142 multithreads call popen
2143 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2144 and pthread_create fails.
2145 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2146 [23125] libc: riscv64: endless loop when throwing an exception from a
2148 [23275] nptl: Race in pthread_mutex_lock while promoting to
2149 PTHREAD_MUTEX_ELISION_NP.
2150 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2152 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2154 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2156 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2157 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2159 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2160 [23521] nss: get_next_alias nss_files file stream leak
2161 [23538] nptl: Hang in pthread_cond_broadcast
2162 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2163 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2164 [23579] libc: Errors misreported in preadv2
2165 [23597] build: support/test-container.c doesn't work with different
2167 [23603] time: mktime signed integer overflow on large timestamps
2168 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2169 [23614] libc: powerpc: missing CFI register information in __mpn_*
2171 [23637] string: Generic strstr/strcasestr fails with huge needles
2172 [23640] libc: no way to easily clear FD_CLOEXEC in
2173 posix_spawn_file_actions_adddup2()
2174 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2176 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2178 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2179 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2180 bits/types/struct_rusage.h
2181 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2183 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2185 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2186 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2187 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2189 [23724] localedata: Albanian date formats are incorrect
2190 [23735] math: libnldbl_nonshared.a references internal libm symbols
2191 [23740] localedata: kl_GL: Month names and date formats need update
2192 [23744] regex: regex refactorings to remove BE, avoid duplication
2193 [23745] time: mktime fix for Gnulib + coreutils
2194 [23758] time: Improve the width of alternate representation for year in
2196 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2197 [23789] time: mktime does not set errno on failure
2198 [23791] localedata: Wrong monetary format for ca_ES locale
2199 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2200 [23794] locale: c16rtomb does not handle surrogate pairs
2201 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2202 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2203 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2204 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2205 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2206 [23862] libc: [sh] missing kernel-features.h undefines
2207 [23864] libc: [riscv] missing kernel-features.h undefines
2208 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2209 [23907] malloc: Incorrect double-free malloc tcache check disregards
2211 [23913] libc: off-by-one in function maybe_script_execute in
2212 sysdeps/posix/spawni.c
2213 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2214 [23923] locale: Add --no-hard-links option to localedef
2215 [23927] network: Linux if_nametoindex() does not close descriptor
2217 [23961] math: powf can overflow to inf without setting errno in non-
2218 nearest rounding mode
2219 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2220 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2221 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2222 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2223 [24011] localedata: Fixed small type in comment for locale bs_BA
2224 [24018] libc: gettext() may return NULL
2225 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2226 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2227 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2229 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2230 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2232 [24046] localedata: en_US locale doesn't define date_fmt
2233 [24063] manual: @var{errno} should be @code{errno}
2234 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2235 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2237 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2239 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2241 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2243 [24112] network: Do not send DNS queries for non-host names (where all
2244 answers will be rejected)
2245 [24130] libc: alpha __remqu corrupts $f3 register
2252 * The localization data for ISO 14651 is updated to match the 2016
2253 Edition 4 release of the standard, this matches data provided by
2254 Unicode 9.0.0. This update introduces significant improvements to the
2255 collation of Unicode characters. This release deviates slightly from
2256 the standard in that the collation element ordering for lowercase and
2257 uppercase LATIN script characters is adjusted to ensure that regular
2258 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2259 is not matched by [a-z]. With the update many locales have been
2260 updated to take advantage of the new collation information. The new
2261 collation information has increased the size of the compiled locale
2262 archive or binary locales.
2264 * The GNU C Library can now be compiled with support for Intel CET, AKA
2265 Intel Control-flow Enforcement Technology. When the library is built
2266 with --enable-cet, the resulting glibc is protected with indirect
2267 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2268 compatible with all existing executables and shared libraries. This
2269 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2270 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2271 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2272 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2273 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2274 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2277 * The GNU C Library now has correct support for ABSOLUTE symbols
2278 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2279 relocated incorrectly or in some cases discarded. The GNU linker can
2280 make use of the newer semantics, but it must communicate it to the
2281 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2282 field) to indicate such support is required.
2284 * Unicode 11.0.0 Support: Character encoding, character type info, and
2285 transliteration tables are all updated to Unicode 11.0.0, using
2286 generator scripts contributed by Mike FABIAN (Red Hat).
2288 * <math.h> functions that round their results to a narrower type are added
2289 from TS 18661-1:2014 and TS 18661-3:2015:
2291 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2292 fMxaddfNx functions.
2294 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2295 fMxsubfNx functions.
2297 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2298 fMxmulfNx functions.
2300 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2301 fMxdivfNx functions.
2303 * Two grammatical forms of month names are now supported for the following
2304 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2305 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2306 support two grammatical forms in abbreviated month names: Catalan, Greek,
2309 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2310 include the support for two grammatical forms of month names.
2312 * Building and running on GNU/Hurd systems now works without out-of-tree
2315 * The renameat2 function has been added, a variant of the renameat function
2316 which has a flags argument. If the flags are zero, the renameat2 function
2317 acts like renameat. If the flag is not zero and there is no kernel
2318 support for renameat2, the function will fail with an errno value of
2319 EINVAL. This is different from the existing gnulib function renameatu,
2320 which performs a plain rename operation in case of a RENAME_NOREPLACE
2321 flags and a non-existing destination (and therefore has a race condition
2322 that can clobber the destination inadvertently).
2324 * The statx function has been added, a variant of the fstatat64
2325 function with an additional flags argument. If there is no direct
2326 kernel support for statx, glibc provides basic stat support based on
2327 the fstatat64 function.
2329 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2330 library if installed. libidn2 version 2.0.5 or later is recommended. If
2331 libidn2 is not available, internationalized domain names are not encoded
2332 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2333 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2334 with an encoding error.) Flags which used to change the IDN encoding and
2335 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2336 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2337 deprecated. They no longer have any effect.
2339 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2340 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2341 range of ELF gABI expressions including such constructs as
2342 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2343 have been further restricted, and where in the past a dynamic string
2344 token sequence may have been interpreted as a literal string it will
2345 now cause a load failure. These load failures were always considered
2346 unspecified behaviour from the perspective of the dynamic loader, and
2347 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2348 results in a load failure now.
2350 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2351 implementation includes all the standard functions provided by
2354 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2355 thrd_detach, thrd_exit, and thrd_join for thread management.
2357 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2358 mtx_destroy for mutual exclusion.
2360 - call_once for function call synchronization.
2362 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2363 cnd_wait for conditional variables.
2365 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2367 Application developers must link against libpthread to use ISO C threads.
2369 Deprecated and removed features, and other changes affecting compatibility:
2371 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2372 installed. Software that was using either header should be updated to
2373 use standard <stdio.h> interfaces instead.
2375 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2376 This was never required by the C standard, and the macros just expanded
2377 to call alternative names for the same functions. If you hoped getc and
2378 putc would provide performance improvements over fgetc and fputc, instead
2379 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2380 necessary, flockfile and funlockfile.
2382 * All stdio functions now treat end-of-file as a sticky condition. If you
2383 read from a file until EOF, and then the file is enlarged by another
2384 process, you must call clearerr or another function with the same effect
2385 (e.g. fseek, rewind) before you can read the additional data. This
2386 corrects a longstanding C99 conformance bug. It is most likely to affect
2387 programs that use stdio to read interactive input from a terminal.
2390 * The macros 'major', 'minor', and 'makedev' are now only available from
2391 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2392 headers that happen to include <sys/types.h>. These macros are rarely
2393 used, not part of POSIX nor XSI, and their names frequently collide with
2394 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2395 further explanation.
2397 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2398 these macros should first include <sys/types.h>, and then include
2399 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2401 * The tilegx*-*-linux-gnu configurations are no longer supported.
2403 * The obsolete function ustat is no longer available to newly linked
2404 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2405 function has been deprecated in favor of fstatfs and statfs.
2407 * The obsolete function nfsservctl is no longer available to newly linked
2408 binaries. This function was specific to systems using the Linux kernel
2409 and could not usefully be used with the GNU C Library on systems with
2410 version 3.1 or later of the Linux kernel.
2412 * The obsolete function name llseek is no longer available to newly linked
2413 binaries. This function was specific to systems using the Linux kernel
2414 and was not declared in a header. Programs should use the lseek64 name
2415 for this function instead.
2417 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2418 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2419 previously selected by them is now always enabled.
2421 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2422 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2423 restriction (rejecting '_' in host names, among other things) has been
2424 removed, for increased compatibility with non-IDN name resolution.
2426 * The fcntl function now have a Long File Support variant named fcntl64. It
2427 is added to fix some Linux Open File Description (OFD) locks usage on non
2428 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2429 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2430 locks act as a cancellation entrypoint.
2432 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2433 ecb_crypt, and des_setparity are no longer available to newly linked
2434 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2435 longer installed. These functions encrypted and decrypted data with the
2436 DES block cipher, which is no longer considered secure. Software that
2437 still uses these functions should switch to a modern cryptography library,
2440 * Reflecting the removal of the encrypt and setkey functions above, the
2441 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2442 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2445 * The obsolete function fcrypt is no longer available to newly linked
2446 binaries. It was just another name for the standard function crypt,
2447 and it has not appeared in any header file in many years.
2449 * We have tentative plans to hand off maintenance of the passphrase-hashing
2450 library, libcrypt, to a separate development project that will, we hope,
2451 keep up better with new passphrase-hashing algorithms. We will continue
2452 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2453 'crypt_r' should not need to change at all; however, distributions will
2454 need to install <crypt.h> and libcrypt from a separate project.
2456 In this release, if the configure option --disable-crypt is used, glibc
2457 will not install <crypt.h> or libcrypt, making room for the separate
2458 project's versions of these files. The plan is to make this the default
2459 behavior in a future release.
2461 Changes to build and runtime requirements:
2463 GNU make 4.0 or later is now required to build glibc.
2465 Security related changes:
2467 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2468 been fixed by removing the glibc-internal IDNA implementation and using
2469 the system-provided libidn2 library instead. Originally reported by Hanno
2470 Böck and Christian Weisgerber.
2472 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2473 architecture could corrupt memory. Reported by Max Horn.
2475 CVE-2018-11236: Very long pathname arguments to realpath function could
2476 result in an integer overflow and buffer overflow. Reported by Alexey
2479 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2480 architecture could write beyond the target buffer, resulting in a buffer
2481 overflow. Reported by Andreas Schwab.
2483 The following bugs are resolved with this release:
2485 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2486 [6889] manual: 'PWD' mentioned but not specified
2487 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2488 when __WORDSIZE != 64
2489 [13762] regex: re_search etc. should return -2 on memory exhaustion
2490 [13888] build: /tmp usage during testing
2491 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2492 [14092] nptl: Support C11 threads
2493 [14095] localedata: Review / update collation data from Unicode / ISO
2495 [14508] libc: -Wformat warnings
2496 [14553] libc: Namespace pollution loff_t in sys/types.h
2497 [14890] libc: Make NT_PRFPREG canonical.
2498 [15105] libc: Extra PLT references with -Os
2499 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2501 [16335] manual: Feature test macro documentation incomplete and out of
2503 [16552] libc: Unify umount implementations in terms of umount2
2504 [17082] libc: htons et al.: statement-expressions prevent use on global
2505 scope with -O1 and higher
2506 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2507 [17438] localedata: pt_BR: wrong d_fmt delimiter
2508 [17662] libc: please implement binding for the new renameat2 syscall
2509 [17721] libc: __restrict defined as /* Ignore */ even in c11
2510 [17979] libc: inconsistency between uchar.h and stdint.h
2511 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2512 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2513 horrible machine code)
2514 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2516 [18471] libc: llseek should be a compat symbol
2517 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2519 [18991] nss: nss_files skips large entry in database
2520 [19239] libc: Including stdlib.h ends up with macros major and minor being
2522 [19463] libc: linknamespace failures when compiled with -Os
2523 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2524 [19527] locale: Normalized charset name not recognized by setlocale
2525 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2526 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2528 [19728] network: out of bounds stack read in libidn function
2529 idna_to_ascii_4i (CVE-2016-6261)
2530 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2531 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2532 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2534 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2535 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2536 [20419] dynamic-link: files with large allocated notes crash in
2538 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2539 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2540 [20980] manual: CFLAGS environment variable replaces vital options
2541 [21163] regex: Assertion failure in pop_fail_stack when executing a
2542 malformed regexp (CVE-2015-8985)
2543 [21234] manual: use of CFLAGS makes glibc detect no optimization
2544 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2545 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2546 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2547 [21508] locale: intl/tst-gettext failure with latest msgfmt
2548 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2549 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2550 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2552 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2554 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2555 [22247] network: Integer overflow in the decode_digit function in
2556 puny_decode.c in libidn (CVE-2017-14062)
2557 [22342] nscd: NSCD not properly caching netgroup
2558 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2559 [22550] localedata: es_ES locale (and other es_* locales): collation
2560 should treat ñ as a primary different character, sync the collation
2561 for Spanish with CLDR
2562 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2563 by gcc configured with --enable-default-pie
2564 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2565 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2566 crossing 2GB threshold (CVE-2017-18269)
2567 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2569 [22735] time: Misleading typo in time.h source comment regarding
2571 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2572 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2573 `__assert_perror_fail ()' to `__assert_fail_base ()'
2574 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2576 [22786] libc: Stack buffer overflow in realpath() if input size is close
2577 to SSIZE_MAX (CVE-2018-11236)
2578 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2579 through an absolute DT_NEEDED path
2580 [22792] build: tcb-offsets.h dependency dropped
2581 [22797] libc: pkey_get() uses non-reserved name of argument
2582 [22807] libc: PTRACE_* constants missing for powerpc
2583 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2584 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2585 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2586 [22848] localedata: ca_ES: update date definitions from CLDR
2587 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2588 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2589 [22896] localedata: Update locale data for an_ES
2590 [22902] math: float128 test failures with GCC 8
2591 [22918] libc: multiple common of `__nss_shadow_database'
2592 [22919] libc: sparc32: backtrace yields infinite backtrace with
2594 [22926] libc: FTBFS on powerpcspe
2595 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2597 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2598 [22947] libc: FAIL: misc/tst-preadvwritev2
2599 [22963] localedata: cs_CZ: Add alternative month names
2600 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2601 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2602 [22998] dynamic-link: execstack tests are disabled when SELinux is
2604 [23005] network: Crash in __res_context_send after memory allocation
2606 [23007] math: strtod cannot handle -nan
2607 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2608 [23036] regex: regex equivalence class regression
2609 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2610 [23069] libc: sigaction broken on riscv64-linux-gnu
2611 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2612 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2613 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2614 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2615 and libc build with -Os)
2616 [23140] localedata: More languages need two forms of month names
2617 [23145] libc: _init/_fini aren't marked as hidden
2618 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2619 [23171] math: C++ iseqsig for long double converts arguments to double
2620 [23178] nscd: sudo will fail when it is run in concurrent with commands
2621 that changes /etc/passwd
2622 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2624 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2625 [23208] localedata: New locale - Lower Sorbian (dsb)
2626 [23233] regex: Memory leak in build_charclass_op function in file
2628 [23236] stdio: Harden function pointers in _IO_str_fields
2629 [23250] nptl: Offset of __private_ss differs from GCC
2630 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2631 -mtune=generic -mfpmath=sse
2632 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2634 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2635 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2637 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2638 [23277] math: nan function should not have const attribute
2639 [23279] math: scanf and strtod wrong for some hex floating-point
2640 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2642 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2643 [23303] build: undefined reference to symbol
2644 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2645 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2647 [23313] stdio: libio vtables validation and standard file object
2649 [23329] libc: The __libc_freeres infrastructure is not properly run across
2651 [23349] libc: Various glibc headers no longer compatible with
2653 [23351] malloc: Remove unused code related to heap dumps and malloc
2655 [23363] stdio: stdio-common/tst-printf.c has non-free license
2656 [23396] regex: Regex equivalence regression in single-byte locales
2657 [23422] localedata: oc_FR: More updates of locale data
2658 [23442] build: New warning with GCC 8
2659 [23448] libc: Out of bounds access in IBM-1390 converter
2660 [23456] libc: Wrong index_cpu_LZCNT
2661 [23458] build: tst-get-cpu-features-static isn't added to tests
2662 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2664 [23467] dynamic-link: x86/CET: A property note parser bug
2671 * The GNU C Library can now be compiled with support for building static
2672 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2673 executables are like static executables but can be loaded at any address
2674 and provide additional security hardening benefits at the cost of some
2675 memory and performance. When the library is built with --enable-static-pie
2676 the resulting libc.a is usable with GCC 8 and above to create static PIE
2677 executables using the GCC option '-static-pie'. This feature is currently
2678 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2679 aarch64 with binutils 2.30 or later.
2681 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2682 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2685 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2687 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2689 * In order to support faster and safer process termination the malloc API
2690 family of functions will no longer print a failure address and stack
2691 backtrace after detecting heap corruption. The goal is to minimize the
2692 amount of work done after corruption is detected and to avoid potential
2693 security issues in continued process execution. Reducing shutdown time
2694 leads to lower overall process restart latency, so there is benefit both
2695 from a security and performance perspective.
2697 * The abort function terminates the process immediately, without flushing
2698 stdio streams. Previous glibc versions used to flush streams, resulting
2699 in deadlocks and further data corruption. This change also affects
2700 process aborts as the result of assertion failures.
2702 * On platforms where long double has the IEEE binary128 format (aarch64,
2703 alpha, mips64, riscv, s390 and sparc), the math library now implements
2704 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2705 These are the same interfaces added in version 2.26 for some platforms where
2706 this format is supported but is not the format of long double.
2708 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2709 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2710 implements interfaces for that type, as defined by ISO/IEC TS
2711 18661-3:2015. These are corresponding interfaces to those supported for
2714 * The math library now implements interfaces for the _Float32, _Float64 and
2715 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2716 corresponding interfaces to those supported for _Float128.
2718 * glibc now implements the memfd_create and mlock2 functions on Linux.
2720 * Support for memory protection keys was added. The <sys/mman.h> header now
2721 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2724 * The copy_file_range function was added.
2726 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2728 * The ldconfig utility now processes `include' directives using the C/POSIX
2729 collation ordering. Previous glibc versions used locale-specific
2730 ordering, the change might break systems that relied on that.
2732 * Support for two grammatical forms of month names has been added.
2733 In a call to strftime, the "%B" and "%b" format specifiers will now
2734 produce the grammatical form required when the month is used as part
2735 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2736 required when the month is named by itself. For instance, in Greek
2737 and in many Slavic and Baltic languages, "%B" will produce the month
2738 in genitive case, and "%OB" will produce the month in nominative case.
2740 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2741 are all valid and will all accept any known form of month
2742 name---standalone or complete, abbreviated or full. In a call to
2743 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2744 the strings used by "%B" and "%b", respectively. New query
2745 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2746 used by "%OB" and "%Ob", respectively.
2748 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2749 define the strings for %OB and %Ob, respectively; these have the
2750 same syntax as "mon" and "abmon". These arrays are optional; if they
2751 are not provided then they have the same content as "mon" and "abmon",
2754 These features are provided for locales which define "alt_mon" and/or
2755 "ab_alt_mon" in their locale source data. This release includes such
2756 alternative month name data for the following languages: Belarusian,
2757 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2759 This feature is currently a GNU extension, but it is expected to
2760 be added to the next revision of POSIX, and it is also already
2761 available on some BSD-derived operating systems.
2763 This feature will cause existing statically compiled applications
2764 to fail to load locales and fall back to the builtin C/POSIX locales.
2765 See notes below for other changes affecting compatibility.
2767 * Support for the RISC-V ISA running on Linux has been added. This port
2768 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2769 for the following ISA and ABI pairs:
2775 Deprecated and removed features, and other changes affecting compatibility:
2777 * Statically compiled applications attempting to load locales compiled for the
2778 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2779 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2780 support for two grammatical forms of the month names, also extends the locale
2781 data binary format. Static applications needing locale support must be
2782 recompiled to match the runtime and data they are deployed with. In some
2783 distributions there is an upgrade window where dynamically linked applications
2784 may use a new library but the old locale data and also fall back to the
2785 builtin C/POSIX locales; restarting the application process is sufficient to
2788 * Support for statically linked applications which call dlopen is deprecated
2789 and will be removed in a future version of glibc. Applications which call
2790 dlopen need to be linked dynamically instead.
2792 * Support for old programs which use internal stdio data structures and
2793 functions is deprecated. This includes programs which use the C++ streams
2794 provided by libstdc++ in GCC 2.95. Programs which use the internal
2795 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2796 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2797 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2798 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2799 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2800 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2801 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2802 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2803 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2804 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2805 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2806 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2807 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2808 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2809 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2810 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2811 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2812 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2813 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2814 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2815 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2816 future version of glibc. Unlike other symbol removals, these old
2817 applications will not be supported using compatibility symbols.
2819 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2820 defined by <sys/ptrace.h>.
2822 * libm no longer supports SVID error handling (calling a user-provided
2823 matherr function on error) or the _LIB_VERSION variable to control error
2824 handling. (SVID error handling and the _LIB_VERSION variable still work
2825 for binaries linked against older versions of the GNU C Library.) The
2826 libieee.a library is no longer provided. math.h no longer defines struct
2827 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2828 TLOSS, PLOSS and HUGE.
2830 * The libm functions pow10, pow10f and pow10l are no longer supported for
2831 new programs. Programs should use the standard names exp10, exp10f and
2832 exp10l for these functions instead.
2834 * The mcontext_t type is no longer the same as struct sigcontext. On
2835 platforms where it was previously the same, this changes the C++ name
2836 mangling for interfaces involving this type.
2838 * The add-ons mechanism for building additional packages at the same time as
2839 glibc has been removed. The --enable-add-ons configure option is now
2842 * The --without-fp configure option is now ignored. Whether hardware
2843 floating-point instructions are used is now configured based on whether
2844 the compiler used at configure time (without any options implied by a
2845 --with-cpu= configure option) uses such instructions.
2847 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2848 the specified string can be parsed as a domain name.
2850 * In the malloc_info output, the <heap> element may contain another <aspace>
2851 element, "subheaps", which contains the number of sub-heaps.
2853 * The libresolv function p_secstodate is no longer supported for new
2856 * The tilepro-*-linux-gnu configuration is no longer supported.
2858 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2859 and will be removed in a future release. Software that is still using
2860 either header should be updated to use standard <stdio.h> interfaces
2863 libio.h was originally the header for a set of supported GNU extensions,
2864 but they have not been maintained as such in many years, they are now
2865 standing in the way of improvements to stdio, and we don't think there are
2866 any remaining external users. _G_config.h was never intended for public
2867 use, but predates the bits convention.
2869 Changes to build and runtime requirements:
2871 * bison version 2.7 or later is required to generate code in the 'intl'
2874 Security related changes:
2876 CVE-2009-5064: The ldd script would sometimes run the program under
2877 examination directly, without preventing code execution through the
2878 dynamic linker. (The glibc project disputes that this is a security
2879 vulnerability; only trusted binaries must be examined using the ldd
2882 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2883 suffered from a one-byte overflow during ~ operator processing (either
2884 on the stack or the heap, depending on the length of the user name).
2885 Reported by Tim Rühsen.
2887 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2888 would sometimes fail to free memory allocated during ~ operator
2889 processing, leading to a memory leak and, potentially, to a denial
2892 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2893 without GLOB_NOESCAPE, could write past the end of a buffer while
2894 unescaping user names. Reported by Tim Rühsen.
2896 CVE-2017-17426: The malloc function, when called with an object size near
2897 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2898 instead of NULL. This was a regression introduced with the new malloc
2899 thread cache in glibc 2.26. Reported by Iain Buclaw.
2901 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2902 to the allocation of too much memory. (This is not a security bug per se,
2903 it is mentioned here only because of the CVE assignment.) Reported by
2906 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2907 of the number of search path components. (This is not a security
2908 vulnerability per se because no trust boundary is crossed if the fix for
2909 CVE-2017-1000366 has been applied, but it is mentioned here only because
2910 of the CVE assignment.) Reported by Qualys.
2912 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2913 for AT_SECURE or SUID binaries could be used to load libraries from the
2916 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2917 succeeds without returning an absolute path due to unexpected behaviour
2918 of the Linux kernel getcwd syscall. Reported by halfdog.
2920 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2921 an object size near the value of SIZE_MAX, would return a pointer to a
2922 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2924 CVE-2018-6551: The malloc function, when called with an object size near
2925 the value of SIZE_MAX, would return a pointer to a buffer which is too
2926 small, instead of NULL.
2928 The following bugs are resolved with this release:
2930 [866] glob: glob should match dangling symlinks
2931 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2932 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2934 [5997] math: Very slow execution of sinf function
2935 [10580] localedata: hr_HR: updated locale
2936 [10871] locale: 'mon' array should contain both nominative and genitive
2938 [12349] localedata: eu_ES: incorrect thousands separator
2939 [13605] localedata: shn_MM: new Shan locale
2940 [13805] localedata: ru_RU: currency should use ',' as radix point
2941 [13953] localedata: km_KH: locale update
2942 [13994] localedata: mjw_IN: new locale
2943 [14121] build: make writes .mo files in po directory
2944 [14333] libc: Fix the race between atexit() and exit()
2945 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2946 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2948 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2949 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2950 width Latin characters
2951 [15332] localedata: es_CU: locale update
2952 [15436] stdio: Don't close or flush stdio streams on abort
2953 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2955 [16148] localedata: ca_ES: incorrect thousands separator
2956 [16750] dynamic-link: ldd should not try to execute the binaries
2958 [16777] localedata: pl_PL: incorrect thousands separator in locale
2959 [16905] localedata: hanzi: new collation
2960 [17563] localedata: cmn_TW: add hanzi collation
2961 [17750] localedata: wrong collation order of diacritics in most locales
2962 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2964 [17956] build: Build fails on missing definitions from header file
2965 nss/nss.h when Mozilla NSS is used for cryptography
2966 [18203] libc: realpath() does not handle unreachable paths correctly
2967 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2968 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2969 [18822] libc: Internal functions are called via PLT
2970 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2971 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2972 [19574] libc: glibc should support building static PIE binaries
2973 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2975 [19971] glob: glob: Do not skip entries with zero d_ino values
2976 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2977 [20008] localedata: km_KH: convert to translit_neutral
2978 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2979 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2980 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2981 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2982 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2984 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2985 they're set, wrong errors returned by gaih_inet when lookup functions
2987 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2988 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2990 [20952] localedata: yuw_PG: new locale
2991 [21084] localedata: charmaps/IBM858: new codepage
2992 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2993 [21242] libc: assert gives pedantic warning in old gcc versions
2994 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2995 __regcall calling convention
2996 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2997 [21326] libc: C99 functions are not declared for C++11 and later if
2998 _GNU_SOURCE is not predefined by g++
2999 [21457] libc: sys/ucontext.h namespace
3000 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3001 [21660] math: GCC fails to compile a formula with tgmath.h
3002 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3003 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3004 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3005 [21684] math: tgmath.h handling of complex integers
3006 [21685] math: tgmath.h handling of bit-fields
3007 [21686] math: tgmath.h handling of __int128
3008 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3010 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3012 [21750] localedata: column width of characters incompatible with classical
3014 [21754] malloc: malloc: Perform as little work as possible after heap
3015 consistency check failures
3016 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3017 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3018 [21791] string: Unused XXX_chk_XXX functions in libc.a
3019 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3021 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3023 [21845] localedata: Added new Locale bho_NP
3024 [21853] localedata: Fix abday Which looks same as day in zh_SG
3025 [21854] localedata: Added New Locale en_SC
3026 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3027 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3028 _dl_runtime_resolve_avx_slow
3029 [21885] network: getaddrinfo: gethosts does not release resolver context
3030 on memory allocation failure
3031 [21899] libc: XPG4.2 sigaction namespace
3032 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3034 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3036 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3037 errno value, causing getaddrinfo to fail
3038 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3039 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3040 instead of EAI_NODATA
3041 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3042 constant PTRACE_SEIZE_DEVEL
3043 [21930] math: C-only gcc builtins used in <math.h> isinf
3044 [21932] network: Unpaired __resolv_context_get in generic get*_r
3046 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3047 [21944] libc: sigval namespace
3048 [21951] localedata: Update hanzi collation by stroke
3049 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3050 sysdeps/x86_64/fpu/e_expf.S
3051 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3052 allocation in syscall loops)
3053 [21959] localedata: Fix Country name for xh_ZA
3054 [21960] localedata: Fix abmon for bem_ZM
3055 [21966] math: AVX2 mathvec functions use FMA without checking
3056 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3057 [21971] localedata: Added New Locale for mfe_MU
3058 [21972] libc: assert macro requires operator== (int) for its argument type
3059 [21973] math: [sparc] libm missing sqrtl compat symbol
3060 [21974] libc: Remove __bb_init_func and __bb_exit_func
3061 [21982] string: stratcliff.c: error: assuming signed overflow does not
3063 [21986] stdio: __guess_grouping is called incorrectly
3064 [21987] math: [sparc32] wrong bits/long-double.h installed
3065 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3067 [22022] localedata: Missing country_name for mni_IN
3068 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3070 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3072 [22026] locale: iconv_open: heap overflow on gconv_init failure
3073 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3074 [22035] math: [m68k] bits/math-inline.h macro namespace
3075 [22038] localedata: Fix abbreviated weeks and months for Somali
3076 [22044] localedata: Remove redundant data for Limburgish Language
3077 [22050] malloc: Linking with -lmcheck does not hook
3078 __malloc_initialize_hook correctly
3079 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3080 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3081 [22070] localedata: charmaps/UTF-8: wcwidth for
3082 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3083 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3084 Jungseong and Jongseong) should be 0
3085 [22078] nss: nss_files performance issue in multi mode
3086 [22082] math: bits/math-finite.h exp10 condition
3087 [22086] libc: pcprofiledump incorrect cross-endian condition
3088 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3089 [22095] network: Name server address allocation memory leak in resolv.conf
3091 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3093 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3094 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3096 [22111] malloc: malloc: per thread cache is not returned when thread exits
3097 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3098 [22134] libc: [linux] implement fexecve with execveat
3099 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3101 [22145] libc: ttyname() gives up too early in the face of namespaces
3102 [22146] math: C++ build issue with float128 on x86_64
3103 [22153] nptl: nptl: save error code before process termination
3104 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3105 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3106 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3107 [22165] libc: [hppa] Text relocations in libc.so
3108 [22180] libc: destructor registered via __cxa_atexit is called twice
3109 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3110 symlinks") cause "make" segfaults
3111 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3113 [22207] libc: FAIL: stdlib/test-atexit-race
3114 [22225] math: nearbyint arithmetic moved before feholdexcept
3115 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3116 [22235] math: iscanonical in C++ and float128
3117 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3118 the svid compat wrapper
3119 [22244] math: ynf and yn are wrong without the svid compat wrapper
3120 [22273] libc: Improper assert in Linux posix_spawn implementation
3121 [22284] libc: -pg -pie doesn't work
3122 [22292] locale: localedef exits with error 4 when it should be error 1
3123 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3124 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3126 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3127 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3129 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3130 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3131 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3132 [22322] libc: [mips64] wrong bits/long-double.h installed
3133 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3134 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3136 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3137 [22343] malloc: Integer overflow in posix_memalign
3138 [22347] libc: getrandom() returns the number of bytes that were copied to
3139 the buffer even though the comments say "Return 0 on success and -1 on
3141 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3142 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3144 [22370] dynamic-link: Incorrect note padding check
3145 [22375] libc: malloc returns pointer from tcache_get when should return
3146 NULL (CVE-2017-17426)
3147 [22377] math: iseqsig, float128 and C++
3148 [22382] localedata: Error in tpi_PG locale
3149 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3150 inside the ASCII printable range
3151 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3153 [22403] localedata: Slash needs escaping in some locales
3154 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3155 [22409] network: res_hnok does not accept some host names used on the
3157 [22412] network: res_dnok, res_hnok should perform syntax checks
3158 [22413] network: ns_name_pton ignores syntactically invalid trailing
3160 [22415] stdio: setvbuf can lead to invalid free/segfault
3161 [22432] build: Non-deterministic build
3162 [22439] malloc: malloc_info should compute summary statistics for all sub-
3164 [22442] network: if_nametoindex could report index for the wrong
3165 networking interface
3166 [22446] build: aliasing violation calling readlink in handle_request
3167 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3168 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3169 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3170 __nscd_hash/__nss_hash
3171 [22463] network: p_secstodate overflow handling
3172 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3173 [22478] libc: sigwait can fail with EINTR
3174 [22505] libc: ldconfig processes include directive in locale-specific
3176 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3177 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3178 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3179 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3180 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3181 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3182 same as for Croatian
3183 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3184 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3185 [22577] libc: missing newline after "cannot allocate TLS data structures
3187 [22588] manual: manual/conf.texi: missing underscore in front of
3189 [22593] math: nextafter and nexttoward are declared with const attribute
3190 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3191 [22603] string: ia64 memchr overflows internal pointer check
3192 [22605] libc: SH clone does not set the exit code correctly
3193 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3195 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3196 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3197 modified in case of success
3198 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3199 [22615] manual: manual: ambiguous wording about errno value in case of
3201 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3203 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3204 binaries or if /proc is not mounted (CVE-2017-16997)
3205 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3206 [22630] build: $(no-pie-ldflag) is no longer effective
3207 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3208 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3209 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3210 [22637] nptl: guard size is subtracted from thread stack size instead of
3212 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3213 [22657] localedata: hu_HU: Avoid double space in date
3214 [22660] math: fmax, fmin sNaN handling on alpha
3215 [22664] libc: New warning of GCC8
3216 [22665] math: alpha: ceil and floor raise inexact exceptions
3217 [22666] math: alpha: trunc raise inexact exceptions
3218 [22667] libc: makecontext lacks stack alignment on i386
3219 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3220 [22679] libc: getcwd(3) can succeed without returning an absolute path
3222 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3223 elision and tunables
3224 [22687] math: [powerpc-nofpu] complex long double functions spurious
3226 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3227 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3228 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3230 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3231 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3233 [22701] nis: Incomplete removal of libnsl
3234 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3235 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3236 [22715] dynamic-link: FAIL: elf/tst-audit10
3237 [22719] libc: Backtrace tests fail on hppa
3238 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3239 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3240 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3241 before the first call to crypt_r () in crypt/badsalttest.c
3248 * A per-thread cache has been added to malloc. Access to the cache requires
3249 no locks and therefore significantly accelerates the fast path to allocate
3250 and free small amounts of memory. Refilling an empty cache requires locking
3251 the underlying arena. Performance measurements show significant gains in a
3252 wide variety of user workloads. Workloads were captured using a special
3253 instrumented malloc and analyzed with a malloc simulator. Contributed by
3254 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3256 * Unicode 10.0.0 Support: Character encoding, character type info, and
3257 transliteration tables are all updated to Unicode 10.0.0, using
3258 generator scripts contributed by Mike FABIAN (Red Hat).
3259 These updates cause user visible changes, especially the changes in
3260 wcwidth for many emoji characters cause problems when emoji sequences
3261 are rendered with pango, see for example:
3262 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3264 * Collation of Hungarian has been overhauled and is now consistent with "The
3265 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3268 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3270 - The GNU C Library will now detect when /etc/resolv.conf has been
3271 modified and reload the changed configuration. The new resolver option
3272 “no-reload” (RES_NORELOAD) disables this behavior.
3274 - The GNU C Library now supports an arbitrary number of search domains
3275 (configured using the “search” directive in /etc/resolv.conf);
3276 previously, there was a hard limit of six domains. For backward
3277 compatibility, applications that directly modify the ‘_res’ global
3278 object are still limited to six search domains.
3280 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3281 Library will now randomly pick a name server from the configuration as a
3282 starting point. (Previously, the second name server was always used.)
3284 * The tunables feature is now enabled by default. This allows users to tweak
3285 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3287 * New function reallocarray, which resizes an allocated block (like realloc)
3288 to the product of two sizes, with a guaranteed clean failure upon integer
3289 overflow in the multiplication. Originally from OpenBSD, contributed by
3290 Dennis Wölfing and Rüdiger Sonderfeld.
3292 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3293 These are extended versions of preadv and pwritev, respectively, taking an
3294 additional flags argument. The set of supported flags depends on the
3295 running kernel; full support currently requires kernel 4.7 or later.
3297 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3298 create a new session ID for the spawned process. This feature is
3299 scheduled to be added to the next major revision of POSIX; for the time
3300 being, it is available under _GNU_SOURCE.
3302 * errno.h is now safe to use from C-preprocessed assembly language on all
3303 supported operating systems. In this context, it will only define the
3304 Exxxx constants, as preprocessor macros expanding to integer literals.
3306 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3307 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3308 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3309 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3311 To compile programs that use this feature, the compiler must support
3312 128-bit floating point with the type name _Float128 (as defined by TS
3313 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3314 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3315 must be defined to make the new interfaces visible.
3317 The new functions and macros correspond to those present for other
3318 floating-point types (except for a few obsolescent interfaces not
3319 supported for the new type), with F128 or f128 suffixes; for example,
3320 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3321 printf or scanf formats for the new type; the strfromf128 and strtof128
3322 interfaces should be used instead.
3324 Deprecated and removed features, and other changes affecting compatibility:
3326 * The synchronization that pthread_spin_unlock performs has been changed to
3327 now be equivalent to a C11 atomic store with release memory order to the
3328 spin lock's memory location. Previously, several (but not all)
3329 architectures used stronger synchronization (e.g., containing what is
3330 often called a full barrier). This change can improve performance, but
3331 may affect odd fringe uses of spin locks that depend on the previous
3332 behavior (e.g., using spin locks as atomic variables to try to implement
3333 Dekker's mutual exclusion algorithm).
3335 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3338 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3339 will only be built and installed when the GNU C Library is configured with
3340 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3341 as TIRPC or rpcsvc-proto, to be used.
3343 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3344 libnss_compat, are deprecated, and will not be built or installed by
3347 The NIS(+) support library, libnsl, is also deprecated. By default, a
3348 compatibility shared library will be built and installed, but not headers
3349 or development libraries. Only a few NIS-related programs require this
3350 library. (In particular, the GNU C Library has never required programs
3351 that use 'gethostbyname' to be linked with libnsl.)
3353 Replacement implementations based on TIRPC, which additionally support
3354 IPv6, are available from <https://github.com/thkukuk/>. The configure
3355 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3356 name service modules, to be built and installed.
3358 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3359 support is enabled, the configured recursive resolver must support EDNS.
3360 (Responding to EDNS-enabled queries with responses which are not
3361 EDNS-enabled is fine, but FORMERR responses are not.)
3363 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3364 servers have not supported this opcode for a long time.
3366 * The _res_opcodes variable has been removed from libresolv. It had been
3367 exported by accident.
3369 * <string.h> no longer includes inline versions of any string functions,
3370 as this kind of optimization is better done by the compiler. The macros
3371 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3373 * The nonstandard header <xlocale.h> has been removed. Most programs should
3374 use <locale.h> instead. If you have a specific need for the definition of
3375 locale_t with no other declarations, please contact
3376 libc-alpha@sourceware.org and explain.
3378 * The obsolete header <sys/ultrasound.h> has been removed.
3380 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3382 * The obsolete function cfree has been removed. Applications should use
3385 * The stack_t type no longer has the name struct sigaltstack. This changes
3386 the C++ name mangling for interfaces involving this type.
3388 * The ucontext_t type no longer has the name struct ucontext. This changes
3389 the C++ name mangling for interfaces involving this type.
3391 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3392 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3393 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3394 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3395 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3396 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3397 fpregset_t type no longer has the name struct fpu. This changes the C++
3398 name mangling for interfaces involving those types.
3400 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3401 synced with the kernel:
3403 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3404 are not supported on this architecture and have been removed.
3406 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3407 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3408 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3410 Programs that assume the GET/SETREGS ptrace requests are universally
3411 available will now fail to build, instead of malfunctioning at runtime.
3413 Changes to build and runtime requirements:
3415 * Linux kernel 3.2 or later is required at runtime, on all architectures
3416 supported by that kernel. (This is a change from version 2.25 only for
3419 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3421 * On most architectures, GCC 4.9 or later is required to build the GNU C
3422 Library. On powerpc64le, GCC 6.2 or later is required.
3424 Older GCC versions and non-GNU compilers are still supported when
3425 compiling programs that use the GNU C Library. (We do not know exactly
3426 how old, and some GNU extensions to C may be _de facto_ required. If you
3427 are interested in helping us make this statement less vague, please
3428 contact libc-alpha@sourceware.org.)
3430 Security related changes:
3432 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3433 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3435 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3436 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3438 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3439 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3442 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3443 fixed (CVE-2017-12133).
3445 The following bugs are resolved with this release:
3447 [984] network: Respond to changed resolv.conf in gethostbyname
3448 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3449 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3451 [12189] libc: __stack_chk_fail should not attempt a backtrace
3453 [14096] time: Race condition on timezone/tst-timezone.out
3454 [14172] localedata: az_IR: new locale
3455 [14995] build: glibc fails to build if gold is the default linker, even if
3457 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3458 [16637] network: inet_pton function is accepting IPv6 with bad format
3459 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3460 x86 and other generic code
3461 [16875] localedata: ko_KR: fix lang_name
3462 [17225] localedata: ar_SY: localized month names for May and June are
3464 [17297] localedata: da_DK: wrong date_fmt string
3465 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3466 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3467 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3468 [19066] localedata: ar_SA abbreviated day and month names are in English
3469 [19569] network: resolv: Support an arbitrary number of search domains
3470 [19570] network: Implement random DNS server selection in the stub
3472 [19838] locale: localedef fails on PA-RISC
3473 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3474 order of 0D36 and 0D37
3475 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3477 [20098] libc: FAIL: debug/backtrace-tst on hppa
3478 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3480 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3482 [20313] localedata: Update locale data to Unicode 9.0
3483 [20424] manual: Document how to provide a malloc replacement
3484 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3486 [20686] locale: Add el_GR@euro to SUPPORTED.
3487 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3488 failures consistently
3489 [21015] dynamic-link: Document and fix --enable-bind-now
3490 [21016] nptl: pthread_cond support is broken on hppa
3491 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3492 frame-pointer on i386
3493 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3495 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3496 [21088] libc: Build fails with --enable-static-nss
3497 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3498 generic c code is used
3499 [21109] libc: Tunables broken on big-endian
3500 [21112] math: powf has large ulp errors with base close to 1 and exponent
3502 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3504 [21120] malloc: glibc malloc is incompatible with GCC 7
3505 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3507 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3508 (-0.0) when linking with -lieee
3509 [21171] math: log10, log2 and lgamma return incorrect results
3510 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3511 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3512 [21207] localedata: ce_RU: update weekdays from CLDR
3513 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3514 [21217] localedata: Update months from CLDR-31
3515 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3516 [21243] libc: support_delete_temp_file should issue warning for failed
3518 [21244] libc: support resolv_test_start() socket fd close should be
3520 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3521 new posix_spawn implementation
3522 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3523 leads to lower CPU frequency
3524 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3525 [21261] libc: [sparc64] bits/setjmp.h namespace
3526 [21267] network: [mips] bits/socket.h IOC* namespace
3527 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3528 [21270] libc: mmap64 silently truncates large offset values
3529 [21275] libc: posix_spawn always crashes on ia64 now
3530 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3531 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3532 [21289] libc: Incorrect declaration for 32-bit platforms with
3533 _FILE_OFFSET_BITS=64 causes build error
3534 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3535 not support gethostbyname4_r
3536 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3538 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3540 [21340] libc: Support POSIX_SPAWN_SETSID
3541 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3542 [21359] network: ns_name_pack needs additional byte in destination buffer
3543 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3544 against fragmentation attacks (CVE-2017-12132)
3545 [21369] network: resolv: Remove EDNS fallback
3546 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3548 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3549 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3550 [21393] stdio: Missing dup3 error check in freopen, freopen64
3551 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3552 [21399] localedata: Bad description for U00EC in
3553 localedata/charmaps/CP1254
3554 [21411] malloc: realloc documentation error
3555 [21426] network: sys/socket.h uio.h namespace
3556 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3557 [21445] libc: signal.h bsd_signal namespace
3558 [21455] network: Network headers stdint.h namespace
3559 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3561 [21475] network: resolv: Overlong search path is truncated mid-label
3562 [21511] libc: sigstack namespace
3563 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3564 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3565 bits/syscall.h: No such file or directory
3566 [21517] libc: struct sigaltstack namespace
3567 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3568 [21533] localedata: Update locale data to Unicode 10.0
3570 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3571 junk at end of line, first unrecognized character is `@'
3572 [21538] libc: SIG_HOLD missing for XPG4
3573 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3574 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3575 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3576 [21543] libc: sigevent namespace
3577 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3578 size for general purpose registers in mcontext_t structure
3579 [21550] libc: sigwait namespace
3580 [21552] libc: XPG4 bsd_signal namespace
3581 [21554] libc: sigpause namespace
3582 [21560] libc: sys/wait.h signal.h namespace
3583 [21561] libc: waitid namespace
3584 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3585 '/usr/include/stdlib.h': Permission denied
3586 [21575] libc: sys/wait.h missing struct rusage definition
3587 [21584] libc: sigaltstack etc namespace
3588 [21597] libc: siginterrupt namespace
3589 [21607] math: hppa: FAIL: math/test-tgmath
3590 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3592 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3593 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3594 stack and heap (CVE-2017-1000366)
3595 [21625] libc: wait3 namespace
3596 [21654] nss: Incorrect pointer alignment in NSS group merge result
3598 [21657] network: Parse interface zone id for node-local multicast
3599 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3601 [21666] libc: .symver is used on common symbol
3602 [21668] network: resolv: res_init cross-thread broadcast introduces race
3604 [21687] math: tgmath.h totalorder, totalordermag return type
3605 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3607 [21696] libc: Incorrect assumption of of __cpu_mask in
3608 posix/sched_cpucount.c
3609 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3610 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3612 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3613 leading to relocation crash
3614 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3615 `resolv_conf_matches (resp, conf)' failed.
3616 [21710] localedata: Added Samoan language locale for Samoa
3617 [21711] localedata: Pashto yesstr/nostr locale are missing
3618 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3619 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3620 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3621 [21723] localedata: yesstr/nostr missing for Chinese language locale
3622 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3624 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3626 [21728] localedata: New Locale for Tongan language
3627 [21729] localedata: incorrect LC_NAME fields for hi_IN
3628 [21733] localedata: yesstr and nostr are missing for zh_HK
3629 [21734] localedata: Missing yesstr and nostr are for kw_GB
3630 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3631 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3632 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3633 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3635 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3637 [21749] localedata: Wrong abbreviated day name (“abday”) for
3639 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3640 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3641 [21759] localedata: missing yesstr and nostr for Tigrinya
3642 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3643 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3644 [21767] localedata: Missing Bislama locales
3645 [21768] localedata: Missing yesstr and nostr for aa_ET
3646 [21770] localedata: Missing Field in li_NL
3647 [21778] nptl: Robust mutex may deadlock
3648 [21779] libc: MicroBlaze segfaults when loading libpthread
3649 [21783] localedata: Fix int_select international_call_prefixes
3650 [21784] localedata: Inconsistency in country_isbn
3651 [21788] localedata: Missing Country Postal Abbreviations
3652 [21794] localedata: Added-country_isbn-for-Italy
3653 [21795] localedata: Add/Fix country_isbn for France
3654 [21796] localedata: Added country_isbn for Republic of Korea
3655 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3656 [21799] localedata: Added int_select international_call_prefixes
3657 [21801] localedata: Added int_select international_call_prefixes
3658 [21804] nptl: Double semicolon in thread-shared-types.h
3659 [21807] localedata: LC_ADDRESS fix for pap_CW
3660 [21808] localedata: Fix LC_ADDRESS for pap_AW
3661 [21821] localedata: Added country_name in mai_IN
3662 [21822] localedata: Fix LC_TIME for mai_IN
3663 [21823] localedata: missing yesstr, nostr for sa_IN
3664 [21825] localedata: Fix name_mrs for mag_IN
3665 [21828] localedata: 2.26 changelog should mention user visible changes
3667 [21835] localedata: Added Maithili language locale for Nepal
3668 [21838] localedata: Removed redundant data for the_NP
3669 [21839] localedata: Fix LC_MONETARY for ta_LK
3670 [21844] localedata: Fix Latin characters and Months Sequence.
3671 [21848] localedata: Fix mai_NP Title Name
3676 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3677 24731-2:2010, is supported to enable declarations of functions from that
3678 TR. Note that not all functions from that TR are supported by the GNU C
3681 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3682 18661-1:2014, is supported to enable declarations of functions and macros
3683 from that TS. Note that not all features from that TS are supported by
3686 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3687 18661-4:2015, is supported to enable declarations of functions and macros
3688 from that TS. Note that most features from that TS are not supported by
3691 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3692 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3693 Since the GNU C Library defaults to a much newer revision of POSIX, this
3694 will only affect programs that specifically request an old conformance
3695 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3696 see a change in the visible declarations, but a program compiled with
3697 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3700 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3701 defined by all multithreaded code, but glibc has not required this for
3704 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3705 means that in a future release, the macros “major”, “minor”, and “makedev”
3706 will only be available from <sys/sysmacros.h>.
3708 These macros are not part of POSIX nor XSI, and their names frequently
3709 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3710 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3711 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3714 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3715 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3716 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3718 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3719 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3720 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3721 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3722 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3723 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3724 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3725 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3726 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3727 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3728 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3731 * New <math.h> features are added from TS 18661-1:2014:
3733 - Signaling NaN macros: SNANF, SNAN, SNANL.
3735 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3736 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3737 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3739 - llogb functions: the llogb, llogbf and llogbl functions, and the
3740 FP_LLOGB0 and FP_LLOGBNAN macros.
3742 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3745 - Comparison macros: iseqsig.
3747 - Classification macros: iscanonical, issubnormal, iszero.
3749 - Total order functions: totalorder, totalorderf, totalorderl,
3750 totalordermag, totalordermagf, totalordermagl.
3752 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3754 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3755 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3757 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3758 are added to libc. They convert a floating-point number into string.
3760 * Most of glibc can now be built with the stack smashing protector enabled.
3761 It is recommended to build glibc with --enable-stack-protector=strong.
3762 Implemented by Nick Alcock (Oracle).
3764 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3765 intended to be used instead of memset() to erase sensitive data after use;
3766 the compiler will not optimize out calls to explicit_bzero even if they
3767 are "unnecessary" (in the sense that no _correct_ program can observe the
3768 effects of the memory clear).
3770 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3771 to float instead of double. This does not affect the ABI of any libraries
3772 that are part of the GNU C Library, but may affect the ABI of other
3773 libraries that use this type in their interfaces.
3775 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3776 float_t and double_t types are now defined to long double instead of float
3777 and double. These options are not the default, and this does not affect
3778 the ABI of any libraries that are part of the GNU C Library, but it may
3779 affect the ABI of other libraries that use this type in their interfaces,
3780 if they are compiled or used with those options.
3782 * The getentropy and getrandom functions, and the <sys/random.h> header file
3785 * The buffer size for byte-oriented stdio streams is now limited to 8192
3786 bytes by default. Previously, on Linux, the default buffer size on most
3787 file systems was 4096 bytes (and thus remains unchanged), except on
3788 network file systems, where the buffer size was unpredictable and could be
3789 as large as several megabytes.
3791 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3792 for the Linux quota interface which predates kernel version 2.4.22 has
3795 * The malloc_get_state and malloc_set_state functions have been removed.
3796 Already-existing binaries that dynamically link to these functions will
3797 get a hidden implementation in which malloc_get_state is a stub. As far
3798 as we know, these functions are used only by GNU Emacs and this change
3799 will not adversely affect already-built Emacs executables. Any undumped
3800 Emacs executables, which normally exist only during an Emacs build, should
3801 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3803 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3804 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3805 “no-ip6-dotint” had already been the default, and support for the
3806 “ip6-dotint” option was removed from the Internet in 2006.
3808 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3809 flag from <resolv.h> have been removed. The option relied on a
3810 backwards-incompatible DNS extension which was never deployed on the
3813 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3814 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3815 They were already unimplemented.
3817 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3818 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3819 removed again from the IETF name lookup interface specification in RFC
3820 2553. Applications should use getaddrinfo instead.
3822 * DNSSEC-related declarations and definitions have been removed from the
3823 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3824 decode the data part of DNSSEC record types. Previous versions of glibc
3825 only implemented minimal support for the previous version of DNSSEC, which
3826 is incompatible with the currently deployed version.
3828 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3829 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3830 <arpa/nameser.h> header file because the distinction between RR types and
3831 meta-RR types is not officially standardized, subject to revision, and
3832 thus not suitable for encoding in a macro.
3834 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3835 and rhook members of the res_state type in <resolv.h> have been removed.
3836 The glibc stub resolver did not support these hooks, but the header file
3837 did not reflect that.
3839 * For multi-arch support it is recommended to use a GCC which has
3840 been built with support for GNU indirect functions. This ensures
3841 that correct debugging information is generated for functions
3842 selected by IFUNC resolvers. This support can either be enabled by
3843 configuring GCC with '--enable-gnu-indirect-function', or by
3844 enabling it by default by setting 'default_gnu_indirect_function'
3845 variable for a particular architecture in the GCC source file
3848 * GDB pretty printers have been added for mutex and condition variable
3849 structures in POSIX Threads. When installed and loaded in gdb these pretty
3850 printers show various pthread variables in human-readable form when read
3851 using the 'print' or 'display' commands in gdb.
3853 * Tunables feature added to allow tweaking of the runtime for an application
3854 program. This feature can be enabled with the '--enable-tunables' configure
3855 flag. The GNU C Library manual has details on usage and README.tunables has
3856 instructions on adding new tunables to the library.
3858 * A new version of condition variables functions have been implemented in
3859 the NPTL implementation of POSIX Threads to provide stronger ordering
3862 * A new version of pthread_rwlock functions have been implemented to use a more
3863 scalable algorithm primarily through not using a critical section anymore to
3866 Security related changes:
3868 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3869 have been created with makecontext could fail to terminate due to a
3870 missing .cantunwind annotation. This has been observed to lead to a hang
3871 (denial of service) in some Go applications compiled with gccgo. Reported
3872 by Andreas Schwab. (CVE-2016-6323)
3874 * The DNS stub resolver functions would crash due to a NULL pointer
3875 dereference when processing a query with a valid DNS question type which
3876 was used internally in the implementation. The stub resolver now uses a
3877 question type which is outside the range of valid question type values.
3880 The following bugs are resolved with this release:
3882 [4099] stdio: Overly aggressive caching by stream i/o functions.
3883 [7065] build: Support building glibc with -fstack-protector or -fstack-
3885 [9842] localedata: en_CA: incorrect date format
3886 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3887 before it started waiting
3888 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3889 [15765] nptl: sem_open is wrongly a cancellation point
3890 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3891 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3893 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3894 library linked with pthread
3895 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3896 "FIXME: Ingo" issue)
3897 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3898 [17252] libc: getrandom and getentropy syscall
3899 [17730] malloc: thread-local storage is sometimes improperly free()'d
3900 after being __libc_memalign()'d
3901 [18241] stdio: failed fseek on memstream does not set errno and can fail
3903 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3905 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3906 PTHREAD_PRIO_INHERIT mutex on ARM
3907 [18784] network: res_query and related function crash for special record
3908 type queries (CVE-2015-5180)
3909 [19380] math: strtod does not raise "inexact"
3910 [19387] string: Integer overflow in memchr
3911 [19390] string: Integer overflow in strncat
3912 [19398] build: linknamespace tests fail with massively parallel build
3913 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3915 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3916 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3917 [19514] libc: [PATCH] Fix spelling errors in spelling
3918 "implement"/"implementation" in several places
3919 [19582] network: Deprecate RES_USE_INET6
3920 [19673] manual: clog10 docs appear to be erroneous
3921 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3922 causes a segmentation fault
3923 [19826] libc: invalid pointer returned from __tls_get_addr with static
3925 [20016] network: resolv: Remove hooks support from the API
3926 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3928 [20033] math: [x86_64] vectorized math function don't call the __finite
3930 [20116] nptl: use after free in pthread_create
3931 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3932 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3934 [20311] nptl: please install proc_service.h
3935 [20366] libc: Compilation errors in installed headers in strict-compliance
3937 [20370] malloc: malloc: Arena free list management is still racy
3938 (incorrect fix in bug 19243)
3939 [20386] libc: assert (X = 0) does not result in GCC warning
3940 [20432] malloc: malloc: Minimize interface required for interposition
3941 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3942 in _Unwind_Backtrace (CVE-2016-6323)
3943 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3944 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3946 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3947 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3948 [20477] network: resolv: incorrect double-checked locking related to
3950 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3952 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3954 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3955 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3956 cause transition penalty
3957 [20517] math: sparcv9 missing fdiml compat symbol
3958 [20524] manual: strverscmp is inconsistent
3959 [20525] libc: <sys/quota.h> should be based on kernel headers
3960 [20539] math: GCC 7 -static -lm fails to link at -O3
3961 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3963 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3965 [20591] network: Remove obsolete DNSSEC support
3966 [20592] network: DNS resource record type classification macros in
3967 <arpa/nameser.h> are incorrect
3968 [20593] network: Update DNS RR type definitions
3969 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3970 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3972 [20629] network: libresolv: Remove support for bitstring labels
3974 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3975 assertion: "maxidx >= 2"
3976 [20660] math: [arm] Use VSQRT
3977 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3978 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3979 [20689] libc: Test for FMA should also check for AVX.
3980 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3981 [20715] math: iszero macro breaks existing code
3982 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3983 [20728] libc: powerpc: Missing TOC stub in clone
3984 [20729] build: glibc-2.24 fails to build for i486 with -Os
3985 [20750] build: Build fails with default PIE enabled gcc-6.x
3986 [20768] math: [alpha] sqrt fegetenv namespace
3987 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3989 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3990 __FLT_EVAL_METHOD__ is 2
3991 [20790] network: rpcgen buffer overrun in get_prog_declaration
3992 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3993 [20829] libc: crypt snprintf namespace
3994 [20847] libc: tst-vfork3 failure
3995 [20855] math: Default bits/mathdef.h has inappropriate float_t
3996 [20859] math: [sh4] FP_ILOGB0 invalid
3997 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3998 U+20AC), not same as GBK
3999 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4000 [20916] math: pow handling of sNaN arguments
4001 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4002 [20919] math: Bad pow (qNaN, 0) result with -lieee
4003 [20940] math: hypot sNaN handling
4004 [20947] math: fmax, fmin sNaN handling
4005 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4006 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4008 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4009 [20973] nptl: robust mutexes: Lost wake-ups
4010 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4011 [20978] nis: strlen on null pointer in nss_nisplus
4012 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4014 [21014] string: i686 memchr overflows internal pointer check
4015 [21019] libc: [mips] n32 lseek incorrect on overflow
4016 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4017 [21026] libc: [MIPS] readahead syscall is broken on n64
4018 [21028] math: Fallback fesetexceptflag should always succeed
4019 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4020 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4022 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4023 [21061] librt: [microblaze] librt lost clock_* exports
4024 [21073] libc: tunables: insecure environment variables passed to
4025 subprocesses with AT_SECURE
4026 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4030 * The minimum Linux kernel version that this version of the GNU C Library
4031 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4032 kernel version 2.6.32 or later suffices (on architectures that already
4033 required kernel versions more recent than 3.2, those requirements remain
4034 unchanged). Linux 3.2 or later kernel headers are required on all
4037 * The pap_AN locale has been deleted. This has been deprecated for a long
4038 time. It has been replaced by pap_AW & pap_CW, both of which have long
4039 been included in previous releases.
4041 * The readdir_r and readdir64_r functions have been deprecated. It is
4042 recommended to use readdir and readdir64 instead.
4044 * The type “union wait” has been removed. It was deprecated in the early
4045 1990s and never part of POSIX. Application code should use the int type
4046 instead of “union wait”.
4048 * A new NSS action is added to facilitate large distributed system
4049 administration. The action, MERGE, allows remote user stores like LDAP
4050 to be merged into local user stores like /etc/groups in order to provide
4051 easy to use, updated, and managed sets of merged credentials. The new
4052 action can be used by configuring it in /etc/nsswitch.conf:
4053 group: files [SUCCESS=merge] nis
4054 Implemented by Stephen Gallagher (Red Hat).
4056 * The deprecated __malloc_initialize_hook variable has been removed from the
4059 * The long unused localedef --old-style option has been removed. It hasn't
4060 done anything in over 16 years. Scripts using this option can safely
4063 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4064 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4065 return the next representable value in the direction of positive infinity
4066 and the nextdown functions return the next representable value in the
4067 direction of negative infinity. These are currently enabled as GNU
4070 Security related changes:
4072 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4073 could result in a stack overflow when getnetbyname was called with an
4074 overly long name. (CVE-2016-3075)
4076 * Previously, getaddrinfo copied large amounts of address data to the stack,
4077 even after the fix for CVE-2013-4458 has been applied, potentially
4078 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4079 instead. Reported by Michael Petlan. (CVE-2016-3706)
4081 * The glob function suffered from a stack-based buffer overflow when it was
4082 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4083 Reported by Alexander Cherepanov. (CVE-2016-1234)
4085 * The Sun RPC UDP client could exhaust all available stack space when
4086 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4087 alloca plugin for GCC. (CVE-2016-4429)
4089 * The IPv6 name server management code in libresolv could result in a memory
4090 leak for each thread which is created, performs a failing naming lookup,
4091 and exits. Over time, this could result in a denial of service due to
4092 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4094 The following bugs are resolved with this release:
4096 [1170] localedata: ne_NP: update Nepali locale definition file
4097 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4099 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4100 [6796] math: fdim() does not set errno on overflow
4101 [10354] libc: posix_spawn should use vfork() in more cases than presently
4102 [11213] localedata: localedata: add copyright disclaimer to locale files
4103 [12143] localedata: chr_US: new Cherokee locale
4104 [12450] localedata: sgs_LT: new locale
4105 [12676] localedata: ln_CD: new locale
4106 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4108 [13304] math: fma, fmaf, fmal produce wrong results
4109 [14259] build: --localedir arg to configure is ignored
4110 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4111 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4112 [14934] localedata: es_CL: wrong first weekday chilean locale
4113 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4115 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4117 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4118 [15368] nptl: raise() is not async-signal-safe
4119 [15479] math: ceil, floor, round and trunc raise inexact exception
4120 [15578] localedata: kk_KZ: various updates
4121 [16003] localedata: pap_AN: punt old locale
4122 [16137] localedata: iw_IL: punt old locale
4123 [16190] localedata: eo: new esperanto locale
4124 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4125 [16742] malloc: race condition: pthread_atfork() called before first
4126 malloc() results in unexpected locking behaviour/deadlocks
4127 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4129 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4130 [17565] localedata: pt_PT: wrong (work-)week start
4131 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4132 [17950] build: Build fails with -msse
4133 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4134 [18433] libc: posix_spawn does not return correctly upon failure to
4136 [18453] localedata: charmaps/IBM875: incorrect codes
4137 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4139 [18896] localedata: he_IL: improvements for currency
4140 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4141 Romanian locale data
4142 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4144 [19056] libc: Deprecate readdir_r
4145 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4147 [19198] localedata: nl_NL: small improvements for Dutch locales
4148 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4149 nameservers (CVE-2016-5417)
4150 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4152 [19400] locale: Language missing in "iso-639.def", trivial fix in
4154 [19431] malloc: Deadlock between fflush, getdelim, and fork
4155 [19505] libc: Incorrect file descriptor validity checks in
4156 posix_spawn_file_actions_add{open,close,dup2}
4157 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4158 when using RTLD_NEXT
4159 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4160 `intl/{gettextP,loadinfo}.h'
4161 [19534] libc: execle, execlp may use malloc
4162 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4163 [19573] network: res_nclose and __res_maybe_init disagree about name
4164 server initialization, breaking Hesiod
4165 [19575] localedata: Status of GB18030 tables
4166 [19581] localedata: sr_* date_fmt string contains additional newline
4167 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4169 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4170 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4171 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4172 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4174 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4176 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4178 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4179 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4180 [19633] locale: strfmon_l applies global locale to number formatting
4181 [19642] network: Memory leak in getnameinfo
4182 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4183 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4185 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4186 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4188 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4189 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4191 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4193 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4195 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4196 pointers and lengths in error-case.
4197 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4198 report errors on UTF-16 surrogates values.
4199 [19755] nscd: nscd assertion failure in gc
4200 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4201 [19759] libc: mempcpy shouldn't be inlined
4202 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4203 [19765] libc: s390 needs an optimized mempcpy
4204 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4205 NAME_MAX limit assumption (CVE-2016-1234)
4206 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4207 [19787] network: Missing and incorrect truncation checks in getnameinfo
4208 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4210 [19791] network: Assertion failure in res_query.c with un-connectable name
4212 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4213 [19822] math: libm.so install clobbers old version
4214 [19825] network: resolv: send_vc can return uninitialized data in second
4215 response to getaddrinfo
4216 [19830] network: nss_dns: should check RDATA length against buffer length
4217 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4218 confronted with A/AAAA records of invalid size
4219 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4220 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4221 [19853] stdio: Printing IBM long double in decimal with high precision is
4223 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4224 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4225 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4227 [19865] network: Assertion failure or memory leak in
4228 _nss_dns_getcanonname_r
4229 [19868] network: nss_dns: netent code does not skip over non-PTR records
4230 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4232 [19881] string: Improve x86-64 memset
4233 [19907] string: Incorrect memcpy tests
4234 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4236 [19925] libc: termios.h XCASE namespace
4237 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4238 [19929] libc: limits.h NL_NMAX namespace
4239 [19931] stdio: Memory leak in vfprintf
4240 [19957] libc: clone(CLONE_VM) access invalid parent memory
4241 [19963] localedata: en_IL: New locale
4242 [19989] stdio: stdio.h cuserid namespace
4243 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4245 [19996] locale: langinfo.h nl_langinfo_l namespace
4246 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4247 [20010] network: getaddrinfo: Stack overflow in hostent translation
4249 [20012] stdio: libio: fmemopen append mode failure
4250 [20014] stdio: stdio.h namespace for pre-threads POSIX
4251 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4252 [20023] libc: fcntl.h timespec namespace
4253 [20024] math: [x86_64] vectorized sincos trashes the stack
4254 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4255 [20041] time: sys/time.h timespec namespace
4256 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4257 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4258 [20051] libc: ttyslot in wrong header under wrong conditions
4259 [20054] libc: gethostname not declared for XPG4
4260 [20055] libc: termios.h missing tcgetsid for XPG4
4261 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4263 [20073] libc: sys/stat.h fchmod namespace
4264 [20074] libc: stdlib.h rand_r namespace
4265 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4266 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4268 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4269 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4271 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4272 [20119] libc: Wrong mask for processors level type from CPUID
4273 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4274 AS not supporting AVX512
4275 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4277 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4278 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4280 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4281 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4282 [20178] libc: posix_spawn{p} should not call exit
4283 [20191] stdio: libio: vtables hardening
4284 [20195] string: FMA4 detection requires CPUID execution with register
4286 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4287 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4289 [20212] math: acos (sNaN) returns sNaN
4290 [20213] math: asin (sNaN) returns sNaN
4291 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4292 [20218] math: [i386] asinhl (sNaN) returns sNaN
4293 [20219] math: [i386] atanhl (sNaN) returns sNaN
4294 [20222] stdio: fopencookie: Mangle function pointers
4295 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4296 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4297 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4299 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4300 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4301 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4302 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4303 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4304 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4305 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4306 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4307 [20240] math: modf (sNaN) returns sNaN
4308 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4309 [20250] math: frexp (sNaN) returns sNaN
4310 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4311 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4313 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4314 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4315 subscript is below array bounds [-Werror=array-bounds]
4316 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4317 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4319 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4320 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4322 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4323 "invalid" exceptions
4324 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4325 [20316] localedata: id_ID: Februari instead of Pebruari
4326 [20327] string: POWER8 strcasecmp returns incorrect result
4327 [20347] math: Failure: Test: j0_downward (0xap+0)
4328 [20348] libc: FAIL: misc/tst-preadvwritev64
4329 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4330 [20350] libc: There is no test for p{read,write}64
4331 [20357] math: Incorrect cos result for 1.5174239687223976
4332 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4336 * Unicode 8.0.0 Support: Character encoding, character type info, and
4337 transliteration tables are all updated to Unicode 8.0.0, using new
4338 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4339 These updates cause user visible changes, such as the fixes for bugs
4340 89, 16061, and 18568.
4342 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4343 kernel-internal CPU set size. This means that requests that change the
4344 CPU affinity which failed before (for example, an all-ones CPU mask) will
4345 now succeed. Applications that need to determine the effective CPU
4346 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4347 setting it because the kernel can adjust it (and the previous size check
4348 would not detect this in the majority of cases).
4350 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4351 the following new symbols are used: fts64_children, fts64_close,
4352 fts64_open, fts64_read and fts64_set.
4354 * getaddrinfo now detects certain invalid responses on an internal netlink
4355 socket. If such responses are received, an affected process will
4356 terminate with an error message of "Unexpected error <number> on netlink
4357 descriptor <number>" or "Unexpected netlink response of size <number> on
4358 descriptor <number>". The most likely cause for these errors is a
4359 multi-threaded application which erroneously closes and reuses the netlink
4360 file descriptor while it is used by getaddrinfo.
4362 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4363 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4364 unnecessary serialization of memory allocation requests across threads.
4365 The defect is now corrected. Users should see a substantial increase in
4366 the concurent throughput of allocation requests for applications which
4367 trigger this bug. Affected applications typically create and
4368 destroy threads frequently. (Bug 19048 was reported and analyzed by
4371 * There is now a --disable-timezone-tools configure option for disabling the
4372 building and installing of the timezone related utilities (zic, zdump, and
4373 tzselect). This is useful for people who build the timezone data and code
4374 independent of the GNU C Library.
4376 * The obsolete header <regexp.h> has been removed. Programs that require
4377 this header must be updated to use <regex.h> instead.
4379 * The obsolete functions bdflush, create_module, get_kernel_syms,
4380 query_module and uselib are no longer available to newly linked binaries;
4381 the header <sys/kdaemon.h> has been removed. These functions and header
4382 were specific to systems using the Linux kernel and could not usefully be
4383 used with the GNU C Library on systems with version 2.6 or later of the
4386 * Optimized string, wcsmbs and memory functions for IBM z13.
4387 Implemented by Stefan Liebler.
4389 * Newly linked programs that define a variable called signgam will no longer
4390 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4391 require signgam to be set by those functions must ensure that they use the
4392 variable provided by the GNU C Library and declared in <math.h>, without
4393 defining their own copy.
4395 * The minimum GCC version that can be used to build this version of the GNU
4396 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4397 still be used to compile programs using the GNU C Library.
4399 Security related changes:
4401 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4402 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4404 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4405 the pointer guard feature. It is always enabled. Previously,
4406 LD_POINTER_GUARD could be used to disable security hardening in binaries
4407 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4410 * An integer overflow in hcreate and hcreate_r could lead to an
4411 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4413 * The catopen function no longer has unbounded stack usage. Reported by
4414 Max. (CVE-2015-8779)
4416 * The nan, nanf and nanl functions no longer have unbounded stack usage
4417 depending on the length of the string passed as an argument to the
4418 functions. Reported by Joseph Myers. (CVE-2014-9761)
4420 * A stack-based buffer overflow was found in libresolv when invoked from
4421 libnss_dns, allowing specially crafted DNS responses to seize control
4422 of execution flow in the DNS client. The buffer overflow occurs in
4423 the functions send_dg (send datagram) and send_vc (send TCP) for the
4424 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4425 family. The use of AF_UNSPEC triggers the low-level resolver code to
4426 send out two parallel queries for A and AAAA. A mismanagement of the
4427 buffers used for those queries could result in the response of a query
4428 writing beyond the alloca allocated buffer created by
4429 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4430 the overflow. Thanks to the Google Security Team and Red Hat for
4431 reporting the security impact of this issue, and Robert Holiday of
4432 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4434 The following bugs are resolved with this release:
4436 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4437 [887] math: Math library function "logb" and "nextafter" inconsistent
4438 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4439 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4440 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4441 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4443 [4404] localedata: German translation of "Alarm clock" is misleading
4444 [6799] math: nextafter() and nexttoward() doen't set errno on
4445 overflow/underflow errors
4446 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4448 [10432] nis: _nss_nis_setnetgrent assertion failure
4449 [11460] libc: fts has no LFS support
4450 [12926] network: getaddrinfo()/make_request() may spin forever
4451 [13065] nptl: Race condition in pthread barriers
4452 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4453 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4455 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4456 [14912] libc: Rename non-installed bits/*.h headers
4457 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4458 [15367] math: Let gcc use __builtin_isinf
4459 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4460 [15421] math: lgamma wrongly sets signgam for ISO C
4461 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4462 FE_INVALID with argument out of range
4463 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4465 [15786] dynamic-link: ifunc resolver functions can smash function
4467 [15918] math: Unnecessary check for equality in hypotf()
4468 [16061] localedata: Review / update transliteration data
4469 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4471 [16141] time: strptime %z offset restriction
4472 [16171] math: drem should be alias of remainder
4473 [16296] math: fegetround is pure?
4474 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4475 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4477 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4478 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4480 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4481 "Exception "Inexact" set" on ppc32
4482 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4483 [16517] math: Missing underflow exception from tanf/tan/tanl
4484 [16519] math: Missing underflow exception from sinhf
4485 [16520] math: Missing underflow exception from tanhf
4486 [16521] math: Missing underflow exception from exp2
4487 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4489 [16734] stdio: fopen calls mmap to allocate its buffer
4490 [16961] math: nan function incorrect handling of bad sequences
4491 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4492 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4493 [16985] locale: localedef: confusing error message when opening output
4495 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4496 [17197] locale: Redundant shift character in iconv conversion output at
4498 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4499 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4500 [17250] dynamic-link: static linking breaks nss loading
4501 (getaddrinfo/getpwnam/etc...)
4502 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4504 [17441] math: isnan() should use __builtin_isnan() in GCC
4505 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4506 (related to lock elision)
4507 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4508 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4509 [17887] time: strptime should be able to parse "+01:00" style timezones
4510 [17905] libc: catopen() Multiple unbounded stack allocations
4512 [18084] libc: backtrace (..., 0) dumps core on x86
4513 [18086] libc: nice() sets errno to 0 on success
4514 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4515 is too large (CVE-2015-8778)
4516 [18251] dynamic-link: SONAME missing when audit modules provides path
4517 [18265] libc: add attributes for wchar string and memory functions
4518 [18370] math: csqrt missing underflows
4519 [18421] libc: [hppa] read-only segment has dynamic relocations
4520 [18472] libc: Obsolete syscall wrappers should be compat symbols
4521 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4522 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4523 [18525] localedata: Remove locale timezone information
4524 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4525 [18568] localedata: Update locale data to Unicode 8.0
4526 [18589] locale: sort-test.sh fails at random
4527 [18595] math: ctan, ctanh missing underflows
4528 [18604] libc: assert macro-expands its argument
4529 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4530 contains a vector instruction exception.
4531 [18611] math: j1, jn missing errno setting on underflow
4532 [18618] localedata: sync Chechen locale definitions with other *_RU
4534 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4535 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4536 [18665] network: In send_dg, the recvfrom function is NOT always using the
4537 buffer size of a newly created buffer (CVE-2015-7547)
4538 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4540 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4542 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4543 [18699] math: tilegx cproj() for various complex infinities does not yield
4545 [18724] libc: Harden put*ent functions against data injection
4546 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4547 [18755] build: build errors with -DNDEBUG
4548 [18757] stdio: fmemopen fails to set errno on failure
4549 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4551 [18781] libc: openat64 lacks O_LARGEFILE
4552 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4553 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4554 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4555 [18790] math: [ldbl-128ibm] tanhl inaccurate
4556 [18795] libc: stpncpy fortification misses buffer lengths that are
4557 statically too large
4558 [18796] build: build fails for --disable-mathvec
4559 [18803] math: hypot missing underflows
4560 [18820] stdio: fmemopen may leak memory on failure
4561 [18823] math: csqrt spurious underflows
4562 [18824] math: fma spurious underflows
4563 [18825] math: pow missing underflows
4564 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4565 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4566 [18870] build: sem_open.c fails to compile with missing symbol
4568 [18872] stdio: Fix memory leak in printf_positional
4569 [18873] libc: posix_fallocate overflow check ineffective
4570 [18875] math: Excess precision leads incorrect libm
4571 [18877] libc: arm: mmap offset regression
4572 [18887] libc: memory corruption when using getmntent on blank lines
4573 [18918] localedata: hu_HU: change time to HH:MM:SS format
4574 [18921] libc: Regression: extraneous stat() and fstat() performed by
4576 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4577 binaries (CVE-2015-8777)
4578 [18951] math: tgamma missing underflows
4579 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4581 [18953] localedata: lt_LT: change currency symbol to the euro
4582 [18956] math: powf inaccuracy
4583 [18961] math: [i386] exp missing underflows
4584 [18966] math: [i386] exp10 missing underflows
4585 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4586 [18969] build: multiple string test failures due to missing locale
4588 [18970] libc: Reference of pthread_setcancelstate in libc.a
4589 [18977] math: float / long double Bessel functions not in XSI POSIX
4590 [18980] math: i386 libm functions return with excess range and precision
4591 [18981] math: i386 scalb*, ldexp return with excess range and precision
4592 [18982] stdio: va_list and vprintf
4593 [18985] time: Passing out of range data to strftime() causes a segfault
4595 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4596 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4597 [19012] locale: iconv_open leaks memory on error path
4598 [19016] math: clog, clog10 inaccuracy
4599 [19018] nptl: Mangle function pointers in tls_dtor_list
4600 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4601 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4602 [19048] malloc: malloc: arena free list can become cyclic, increasing
4604 [19049] math: [powerpc] erfc incorrect zero sign
4605 [19050] math: [powerpc] log* incorrect zero sign
4606 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4607 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4608 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4609 [19074] network: Data race in _res_hconf_reorder_addrs
4610 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4611 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4612 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4614 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4616 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4617 [19086] manual: posix_fallocate64 documented argument order is wrong.
4618 [19088] math: lround, llround missing exceptions close to overflow
4620 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4621 [19095] math: dbl-64 lrint incorrect for 64-bit long
4622 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4623 [19124] dynamic-link: ld.so failed to build with older assmebler
4624 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4625 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4626 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4627 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4628 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4629 pthread_setaffinity_np
4630 [19156] math: [ldbl-128] j0l spurious underflows
4631 [19164] nptl: tst-getcpu fails with many possible CPUs
4632 [19168] math: math/test-ildoubl and math/test-ldouble failure
4633 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4634 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4636 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4637 (FE_NOMASK_ENV) do not clear SSE exceptions
4638 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4639 _int_new_arena/reused_arena
4640 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4641 [19201] math: dbl-64 remainder incorrect sign of zero result
4642 [19205] math: bits/math-finite.h conditions do not match math.h and
4644 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4645 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4646 for C99-based standards
4647 [19212] libc: features.h not -Wundef clean
4648 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4650 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4651 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4652 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4654 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4655 "inexact" exceptions
4656 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4658 [19242] libc: strtol incorrect in Turkish locales
4659 [19243] malloc: reused_arena can pick an arena on the free list, leading
4660 to an assertion failure and reference count corruption
4661 [19253] time: tzset() ineffective when temporary TZ did not include DST
4663 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4664 [19270] math: [hppa] Shared libm missing __isnanl
4665 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4666 MAP_HUGETLB and MAP_STACK defines
4667 [19313] nptl: Wrong __cpu_mask for x32
4668 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4669 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4670 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4671 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4672 [19363] time: x32: times() return value wrongly truncates/sign extends
4674 [19367] dynamic-link: Improve branch prediction on Silvermont
4675 [19369] network: Default domain name not reset by res_ninit when "search"
4676 / "domain" entry is removed from resolv.conf
4677 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4679 [19385] localedata: bg_BG: time separator should be colon, not comma
4680 [19408] libc: linux personality syscall wrapper may erroneously return an
4681 error on 32-bit architectures
4682 [19415] libc: dladdr returns wrong names on hppa
4683 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4684 IBM905, IBM907, and IBM909
4685 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4686 [19443] build: build failures with -DDEBUG
4687 [19451] build: Make check fails on test-double-vlen2
4688 [19462] libc: Glibc failed to build with -Os
4689 [19465] math: Wrong code with -Os
4690 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4692 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4694 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4695 [19486] math: S390: Math tests fail with "Exception Inexact set".
4696 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4697 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4699 [19590] math: Fail to build shared objects that use libmvec.so functions.
4703 * The following bugs are resolved with this release:
4705 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4706 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4707 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4708 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4709 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4710 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4711 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4712 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4713 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4714 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4715 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4716 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4717 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4718 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4719 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4720 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4721 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4722 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4723 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4724 18657, 18676, 18694, 18696, 18887.
4726 * Cache information can be queried via sysconf() function on s390 e.g. with
4727 _SC_LEVEL1_ICACHE_SIZE as argument.
4729 * A buffer overflow in gethostbyname_r and related functions performing DNS
4730 requests has been fixed. If the NSS functions were called with a
4731 misaligned buffer, the buffer length change due to pointer alignment was
4732 not taken into account. This could result in application crashes or,
4733 potentially arbitrary code execution, using crafted, but syntactically
4734 valid DNS responses. (CVE-2015-1781)
4736 * The time zone file parser has been made more robust against crafted time
4737 zone files, avoiding heap buffer overflows related to the processing of
4738 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4739 large time zone data files. Overly long time zone specifiers in the TZ
4740 variable no longer result in stack overflows and crashes.
4742 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4743 for LD and GD on x86 and x86-64, has been implemented. You will need
4744 binutils-2.24 or later to enable this optimization.
4746 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4747 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4748 Hat). These updates cause user visible changes, such as the fix for bug
4751 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4752 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4753 condition in some applications.
4755 * Added vector math library named libmvec with the following vectorized x86_64
4756 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4758 The library can be disabled with --disable-mathvec. Use of the functions is
4759 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4760 Shared library libmvec.so is linked in as needed when using -lm (no need to
4761 specify -lmvec explicitly for not static builds).
4762 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4764 * A new fmemopen implementation has been added with the goal of POSIX
4765 compliance. The new implementation fixes the following long-standing
4766 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4767 old implementation is still present for use be by existing binaries.
4769 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4770 releases. It has been fixed to match 2.19 and older, but binaries built
4771 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4773 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4774 Contributed by Roland McGrath (Google).
4776 * The header <regexp.h> is deprecated, and will be removed in a future
4777 release. Use of this header will trigger a deprecation warning.
4778 Application developers should update their code to use <regex.h> instead.
4780 This header was formerly part of SUS, but was deprecated in 1994 and
4781 removed from the standard in 2001. Also, the glibc implementation
4782 leaks memory. See BZ#18681 for more details.
4786 * The following bugs are resolved with this release:
4788 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4789 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4790 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4791 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4792 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4793 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4794 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4795 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4796 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4797 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4800 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4801 too little memory for the to-be-scanned arguments and overflow the
4802 allocated buffer. The implementation now correctly computes the required
4803 buffer size when using malloc, and switches to malloc from alloca as
4806 * A new semaphore algorithm has been implemented in generic C code for all
4807 machines. Previous custom assembly implementations of semaphore were
4808 difficult to reason about or ensure that they were safe. The new version
4809 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4810 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4811 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4813 * Port to Altera Nios II has been contributed by Mentor Graphics.
4815 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4816 implementations for powerpc64/powerpc64le.
4817 Implemented by Adhemerval Zanella (IBM).
4819 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4820 and powerpc64le. This may improve lock scaling of existing programs on
4821 HTM capable systems. The lock elision code is only enabled with
4822 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4823 powerpc will issue a transaction abort on every syscall to avoid side
4824 effects being visible outside transactions.
4826 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4827 AArch64. Contributed by ARM Ltd.
4829 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4831 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4832 under certain input conditions resulting in the execution of a shell for
4833 command substitution when the application did not request it. The
4834 implementation now checks WRDE_NOCMD immediately before executing the
4835 shell and returns the error WRDE_CMDSUB as expected.
4837 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4838 processing format strings with a large number of format specifiers.
4840 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4841 infinite loop if the DNS response contained a PTR record of an unexpected
4844 * The minimum GCC version that can be used to build this version of the GNU
4845 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4846 still be used to compile programs using the GNU C Library.
4848 * The GNU C Library is now built with -Werror by default. This can be
4849 disabled by configuring with --disable-werror.
4851 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4853 * The obsolete sigvec function has been removed. This was the original
4854 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4855 programs have been using instead for about 25 years. Of course, ABI
4856 compatibility for old binaries using sigvec remains intact.
4858 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4859 with newer versions of bison.
4861 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4862 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4863 registers overlay two consecutive single-precision registers. MIPS32R2
4864 introduced a new FPU mode (FR=1) where double-precision registers extend the
4865 corresponding single-precision registers which is incompatible with the
4866 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4867 require the use of FR=1 making a transition necessary. New o32 ABI
4868 extensions enable users to migrate over time from the original o32 ABI
4869 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4870 tracks the ABI of any loaded object and verifies that new objects are
4871 compatible. Mode transitions will also be requested as required and
4872 unsupportable objects will be rejected. The ABI checks include both soft and
4873 hard float ABIs for o32, n32 and n64.
4875 GCC 5 with GNU binutils 2.25 onwards:
4876 It is strongly recommended that all o32 system libraries are built using the
4877 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4878 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4879 compiler using --with-fp-32=xx to set this by default.
4883 * The following bugs are resolved with this release:
4885 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4886 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4887 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4888 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4889 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4890 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4891 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4892 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4893 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4894 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4895 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4896 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4897 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4898 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4899 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4901 * Reverted change of ABI data structures for s390 and s390x:
4902 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4903 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4904 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4905 are preserved pointing straight to the same implementation as the old ones.
4906 Given that, new callers will simply provide a too-big buffer to these
4907 functions. Any applications/libraries out there that embed jmp_buf or
4908 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4909 against 2.19 headers will have to rebuilt again. This is necessary in any
4910 case to revert the breakage in their ABI caused by the glibc change.
4912 * Support for file description locks is added to systems running the
4913 Linux kernel. The standard file locking interfaces are extended to
4914 operate on file descriptions, not file descriptors, via the use of
4915 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4916 are associated with an open file instead of a process.
4918 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4920 * The minimum Linux kernel version that this version of the GNU C Library
4921 can be used with is 2.6.32.
4923 * Running the testsuite no longer terminates as soon as a test fails.
4924 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4925 with PASS or FAIL lines for individual tests. A summary of the results is
4926 printed, including a list of failing lists, and "make check" exits with
4927 error status if there were any unexpected failures. "make check
4928 stop-on-test-failure=y" may be used to keep the old behavior.
4930 * The am33 port, which had not worked for several years, has been removed
4933 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4934 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4935 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4936 conflicted with POSIX (support for which was removed in 2.19), the
4937 interfaces those macros enabled remain available when compiling with
4938 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4939 test macros defined.
4941 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4943 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4944 This may improve lock scaling of existing programs on TX capable systems.
4945 The lock elision code is only built with --enable-lock-elision=yes and
4946 then requires a GCC version supporting the TX builtins. With lock elision
4947 default mutexes are elided via __builtin_tbegin, if the cpu supports
4948 transactions. By default lock elision is not enabled and the elision code
4951 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4952 copy the path argument. This allowed programs to cause posix_spawn to
4953 deference a dangling pointer, or use an unexpected pathname argument if
4954 the string was modified after the posix_spawn_file_actions_addopen
4957 * All supported architectures now use the main glibc sysdeps directory
4958 instead of some being in a separate "ports" directory (which was
4959 distributed separately before glibc 2.17).
4961 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4962 On configurations that support it (all Linux configurations), it's now
4963 used regardless of the --enable-add-ons switch to configure. It is no
4964 longer possible to build such configurations without pthreads support.
4966 * Locale names, including those obtained from environment variables (LANG
4967 and the LC_* variables), are more tightly checked for proper syntax.
4968 setlocale will now fail (with EINVAL) for locale names that are overly
4969 long, contain slashes without starting with a slash, or contain ".." path
4970 components. (CVE-2014-0475) Previously, some valid locale names were
4971 silently replaced with the "C" locale when running in AT_SECURE mode
4972 (e.g., in a SUID program). This is no longer necessary because of the
4975 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4976 with application code using Intel MPX instructions. (With all previous
4977 versions, the MPX register state could be clobbered when making calls
4978 into or out of a shared library.) Note that while the new dynamic
4979 linker is compatible with all known x86 hardware whether or not it
4980 supports Intel MPX, some x86 instruction-set emulators might fail to
4981 handle the new instruction encodings. This is known to affect Valgrind
4982 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4983 release), and might affect other tools that do instruction emulation.
4985 * Support for loadable gconv transliteration modules has been removed.
4986 The support for transliteration modules has been non-functional for
4987 over a decade, and the removal is prompted by security defects. The
4988 normal gconv conversion modules are still supported. Transliteration
4989 with //TRANSLIT is still possible, and the //IGNORE specifier
4990 continues to be supported. (CVE-2014-5119)
4992 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4993 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4994 resulting a denial-of-service security vulnerability in applications which
4995 use functions related to iconv. (CVE-2014-6040)
4999 * The following bugs are resolved with this release:
5001 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5002 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5003 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5004 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5005 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5006 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5007 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5008 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5009 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5010 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5011 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5012 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5013 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5014 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5015 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5016 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5017 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5018 16431, 16453, 16474, 16506, 16510, 16529
5020 * Slovenian translations for glibc messages have been contributed by the
5021 Translation Project's Slovenian team of translators.
5023 * The public headers no longer use __unused nor __block. This change is to
5024 support compiling programs that are derived from BSD sources and use
5025 __unused internally, and to support compiling with Clang's -fblock
5026 extension which uses __block.
5028 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5029 large collation sequences to optimize multiple passes. This cache
5030 computation may overflow for large collation sequences and may cause a
5031 stack or buffer overflow. This is now fixed to use a slower algorithm
5032 which does not use a cache if there is an integer overflow.
5034 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5035 rules for large collation sequences to optimize multiple passes and falls
5036 back to alloca if malloc fails, resulting in a possible stack overflow.
5037 The implementation now falls back to an uncached collation sequence lookup
5040 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5041 initialized for static applications resulting in the security feature
5042 being disabled. The pointer guard is now correctly initialized to a
5043 random value for static applications. Existing static applications need
5044 to be recompiled to take advantage of the fix (bug 15754).
5046 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5047 to the d_name member of struct dirent, or omit the terminating NUL
5048 character. (Bugzilla #14699).
5050 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5051 aligned_alloc functions could allocate too few bytes or corrupt the
5052 heap when passed very large allocation size values (Bugzilla #15855,
5055 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5056 for AF_INET6 has been fixed (Bugzilla #16072).
5058 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5059 pap_CW, quz_PE, the_NP.
5061 * Substantially revised locales: gd_GB, ht_HT
5063 * The LC_ADDRESS field was updated to support country_car for almost all
5066 * ISO 1427 definitions were updated.
5068 * ISO 3166 definitions were updated.
5070 * The localedef utility now supports --big-endian and --little-endian
5071 command-line options to generate locales for a different system from that
5072 for which the C library was built.
5074 * Binary locale files now only depend on the endianness of the system for
5075 which they are generated and not on other properties of that system. As a
5076 consequence, binary files generated with new localedef may be incompatible
5077 with old versions of the GNU C Library, and binary files generated with
5078 old localedef may be incompatible with this version of the GNU C Library,
5079 in the following circumstances:
5081 + Locale files may be incompatible on m68k systems.
5083 + Locale archive files (but not separate files for individual locales) may
5084 be incompatible on systems where plain "char" is signed.
5086 * The configure option --disable-versioning has been removed. Builds with
5087 --disable-versioning had not worked for several years.
5089 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5090 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5092 * SystemTap probes for malloc have been introduced.
5094 * SystemTap probes for slow multiple precision fallback paths of
5095 transcendental functions have been introduced.
5097 * Support for powerpc64le has been added.
5099 * The soft-float powerpc port now supports e500 processors.
5101 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5103 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5104 set of header declarations that are enabled by default, even when other
5105 feature test macros or compiler options such as -std=c99 would otherwise
5106 disable some of those declarations.
5108 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5109 conflict with POSIX. The libbsd-compat library (which was a dummy library
5110 that did nothing) has also been removed.
5112 * Preliminary documentation about Multi-Thread, Async-Signal and
5113 Async-Cancel Safety has been added.
5115 * Change of ABI data structures for s390 and s390x:
5116 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5117 allow for future hardware extensions. All library functions that accept or
5118 return these structures were versioned in order to provide backwards
5119 compatibility with existing code. However, not all cases can be handled
5120 with interface versioning. If an application embeds either structure into
5121 another structure and that structure is passed to another compilation unit
5122 which expects the newer larger-sized object then any access to the new
5123 fields will result in undefined behaviour. Similarly any access to fields
5124 that were moved by the enlarging of the structures will cause undefined
5125 behaviour. To fix the undefined behaviour all objects that are part of the
5126 final in-memory image must agree on the size of structures, and this may
5127 require recompilation.
5131 * The following bugs are resolved with this release:
5133 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5134 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5135 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5136 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5137 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5138 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5139 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5140 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5141 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5142 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5143 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5144 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5145 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5148 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5149 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5150 Distributions can re-enable building and using pt_chown via the new configure
5151 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5152 considerable security risks and should only be used if the distribution
5153 understands and accepts the risks.
5155 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5158 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5159 fixed (Bugzilla #15330).
5161 * Add support for calling C++11 thread_local object destructors on thread
5162 and program exit. This needs compiler support for offloading C++11
5163 destructor calls to glibc.
5165 * Improved worst case performance of libm functions with double inputs and
5168 * Support for priority inherited mutexes in pthread condition variables on
5169 non-x86 architectures.
5171 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5173 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5175 * Optimized string functions for ARM. Implemented by Will Newton and
5178 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5180 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5183 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5184 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5186 * Added a benchmark framework to track performance of functions in glibc.
5188 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5189 It is based on draft TS 18661 and currently enabled as a GNU extension.
5191 * On Linux, the clock function now uses the clock_gettime system call
5192 for improved precision, rather than old times system call.
5194 * Added support for version-3 tz format files. This is needed when using
5195 the tz database release 2013e or later, and affects a few unusual cases --
5196 currently only TZ='America/Godthab' for time stamps after 2037.
5198 * Added new API functions pthread_getattr_default_np and
5199 pthread_setattr_default_np to get and set the default pthread
5200 attributes of a process.
5202 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5203 This may improve lock scaling of existing programs on TSX capable systems.
5204 When the --enable-lock-elision=yes parameter is specified at configure
5205 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5208 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5209 availability). Implemented by Ryan S. Arnold.
5211 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5215 * The following bugs are resolved with this release:
5217 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5218 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5219 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5220 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5221 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5222 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5223 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5224 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5225 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5226 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5227 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5228 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5229 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5230 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5231 14879, 14889, 14893, 14898, 14914.
5233 * Optimization of memcpy for MIPS.
5235 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5236 EMFILE has been fixed (Bugzilla #14889).
5238 * The add-on ports collection is now distributed in the "ports" subdirectory
5239 of the main GNU C Library distribution, rather than separately.
5241 * Port to ARM AArch64 contributed by Linaro.
5243 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5244 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5246 Implemented by Andreas Krebbel.
5248 * The new function secure_getenv allows secure access to the environment,
5249 returning NULL if running in a SUID/SGID process. This function replaces
5250 the internal function __secure_getenv.
5252 * SystemTap static probes have been added into the dynamic linker.
5253 Implemented by Gary Benson.
5255 * Optimizations of string functions strstr, strcasestr and memmem.
5256 Implemented by Maxim Kuvyrkov.
5258 * The minimum Linux kernel version that this version of the GNU C Library
5259 can be used with is 2.6.16.
5261 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5262 powerpc POWER7. Implemented by Will Schmidt.
5264 * New configure option --disable-nscd builds the C library such that it
5265 never attempts to contact the Name Service Caching Daemon (nscd).
5266 New configure option --disable-build-nscd avoids building nscd itself;
5267 this is the default if --disable-nscd is used.
5269 * Improved support for cross-compilation, including cross-testing and
5270 bootstrap builds without a previously built glibc.
5272 * Several testsuite tests are now able to test multiple IFUNC variants of an
5273 interface, rather than just testing the one that would be chooen by
5276 * New configure options --with-bugurl and --with-pkgversion, for
5277 distributors to use to embed their bug-reporting and package version
5278 information in --help and --version output.
5280 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5281 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5282 allows creation of chroots without the procfs mounted on /proc.
5284 * The `crypt' function now fails if passed salt bytes that violate the
5285 specification for those values. On Linux, the `crypt' function will
5286 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5287 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5288 when the mode is enabled.
5290 * The `clock_*' suite of functions (declared in <time.h>) is now available
5291 directly in the main C library. Previously it was necessary to link with
5292 -lrt to use these functions. This change has the effect that a
5293 single-threaded program that uses a function such as `clock_gettime' (and
5294 is not linked with -lrt) will no longer implicitly load the pthreads
5295 library at runtime and so will not suffer the overheads associated with
5296 multi-thread support in other code such as the C++ runtime library.
5298 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5303 * The following bugs are resolved with this release:
5305 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5306 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5307 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5308 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5309 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5310 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5311 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5312 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5313 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5314 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5315 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5316 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5317 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5318 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5319 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5320 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5321 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5322 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5323 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5324 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5325 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5326 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5329 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5330 configuring glibc with:
5331 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5332 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5333 Implemented by H.J. Lu.
5337 + define static_assert
5339 + do not declare gets
5341 + declare at_quick_exit and quick_exit also for ISO C11
5343 + aligned_alloc. NB: The code is deliberately allows the size parameter
5344 to not be a multiple of the alignment. This is a moronic requirement
5345 in the standard but it is only a requirement on the caller, not the
5348 + timespec_get added
5350 + uchar.h support added
5352 + CMPLX, CMPLXF, CMPLXL added
5354 Implemented by Ulrich Drepper.
5356 * Support for the IA-64 has been moved to ports.
5358 * Remove support for anything but ELF binary format
5360 * Checking versions of poll, ppoll added.
5361 Implemented by Ulrich Drepper.
5363 * More generic and 64-bit performance optimizations to math functions.
5364 Implemented by Ulrich Drepper.
5366 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5367 headers and functions available at compile time as they were before
5368 version 2.14. This option will be removed at some time in the future
5369 after the TI-RPC library becomes fully sufficient for the needs of
5370 existing applications.
5372 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5373 Note that glibc is not expected to work with any Linux kernel version
5376 * New header <sys/auxv.h> and function getauxval allowing easy access to
5377 the AT_* key-value pairs passed from the Linux kernel. The header also
5378 defines the HWCAP_* bits associated with the AT_HWCAP key.
5380 * New locales: mag_IN
5382 * New configure option --enable-systemtap builds SystemTap static probes
5383 into libc for setjmp and longjmp and into libpthread for various operations.
5384 So far the setjmp/longjmp probes and some of the libpthread probes are
5385 provided only for i*86 and x86_64.
5386 Implemented by Roland McGrath and Rayson Ho.
5388 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5390 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5393 * More optimized functions for SPARC. Implemented by David S. Miller.
5395 * Improved support for cross-compilation, especially bootstrap builds
5396 without a previously built glibc.
5398 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5399 Chris Metcalf from Tilera.
5401 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5402 now supported for ARM processors.
5404 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5405 as the name of the dynamic linker, to distinguish it from the
5406 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5408 * Support for CRIS has been removed from ports.
5410 * A new class of installed header has been documented for low-level
5411 platform-specific functionality. PowerPC added the first instance with a
5412 function to provide time base register access. Contributed by Tulio
5413 Magno Quites Machado Filho.
5415 * ix86 configurations now install header files that are consistent with
5416 what x86-64 configurations install. These same header files can be used
5417 for -m32, -m64, or -mx32 builds.
5418 Contributed by H.J. Lu.
5420 * Math library bug fixes. A thorough audit of all open math library bugs was
5421 conducted by Joseph Myers. Significant progress was made on many math
5422 library bugs resulting in more accurate exceptions and function results.
5423 Many thanks to all those that contributed including Andreas Jaeger for his
5424 patch review and work on the x87 trigonometric instruction issues.
5426 * Timezone data is no longer installed. Timezone-related binaries and scripts
5427 will continue to be installed. Users should obtain their timezone data from
5428 their distribution provider or from the tzdata package at
5429 <ftp://munnari.oz.au/pub/>.
5433 * The following bugs are resolved with this release:
5435 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5436 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5437 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5438 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5439 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5440 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5441 13484, 13506, 13515, 13523, 13524, 13538, 13540
5443 * New program pldd to list loaded object of a process
5444 Implemented by Ulrich Drepper.
5446 * Add nss_db support back to glibc. No more dependency on Berkeley db
5447 and support for initgroups lookups.
5448 Implemented by Ulrich Drepper.
5450 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5451 Contributed by HJ Lu.
5453 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5454 Contributed by HJ Lu.
5456 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5457 on x86-32 and x86-64.
5458 Contributed by Liubov Dmitrieva.
5460 * Optimized strchr and strrchr for SSE on x86-32.
5461 Contributed by Liubov Dmitrieva.
5463 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5464 for x86-64 and x86-32.
5465 Contributed by Liubov Dmitrieva.
5467 * New interfaces: scandirat, scandirat64
5468 Implemented by Ulrich Drepper.
5470 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5471 Implemented by Ulrich Drepper.
5473 * nscd now also caches the netgroup database.
5474 Implemented by Ulrich Drepper.
5476 * Integrate libm with gcc's -ffinite-math-only option.
5477 Implemented by Ulrich Drepper.
5479 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5480 to math functions. Implemented by Ulrich Drepper.
5482 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5483 Implemented by Ulrich Drepper.
5485 * New Linux interfaces: process_vm_readv, process_vm_writev
5487 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5488 Implemented by Ulrich Drepper.
5490 * Optimized nearbyint and strcasecmp for PPC.
5491 Implemented by Adhemerval Zanella.
5493 * New locales: bho_IN, unm_US, es_CU, ta_LK
5497 * The following bugs are resolved with this release:
5499 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5500 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5501 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5502 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5503 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5504 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5505 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5506 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5507 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5508 12795, 12811, 12813, 12814, 12841
5510 * The RPC implementation in libc is obsoleted. Old programs keep working
5511 but new programs cannot be linked with the routines in libc anymore.
5512 Programs in need of RPC functionality must be linked against TI-RPC.
5513 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5515 Visible changes of this change include (obviously) the inability to link
5516 programs using RPC functions without referencing the TI-RPC library and the
5517 removal of the RPC headers from the glibc headers.
5518 Implemented by Ulrich Drepper.
5520 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5521 syncfs, setns, sendmmsg
5523 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5524 yue_HK, lij_IT, mhr_RU
5526 * New encodings: CP770, CP771, CP772, CP773, CP774
5528 * New program sotruss to trace calls through PLTs
5529 Implemented by Ulrich Drepper.
5531 * The malloc hook implementation is marked deprecated and will be removed
5532 from the default implementation in the next version. The design never
5533 worked ever since the introduction of threads. Even programs which do
5534 not create threads themselves can use multiple threads created internally.
5538 * The following bugs are resolved with this release:
5540 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5541 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5542 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5543 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5546 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5548 * POWER7 optimizations: memset, memcmp, strncmp
5550 * New optimized string functions for x86-64: strnlen (SSE2),
5551 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5552 Implemented by Ulrich Drepper.
5556 * The following bugs are resolved with this release:
5558 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5559 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5560 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5561 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5562 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5563 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5564 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5565 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5567 * New interfaces: pthread_getname_np, pthread_setname_np
5569 * New Linux interface: recvmmsg
5571 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5573 * The dynamic linker now recognizes supported ABI versions from the
5574 EI_ABIVERSION field in the ELF header.
5575 Implemented by Ulrich Drepper.
5577 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5578 will not be used to fill in password fields in the passwd.byname replies.
5579 Instead it is used to synthesize the shadow.byname table, should it be
5580 missing. This is a useful mode in some installations involving Solaris.
5581 Implemented by Ulrich Drepper.
5583 * New locales: kok_IN, sq_MK, cv_RU
5587 * The following bugs are resolved with this release:
5589 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5590 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5591 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5592 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5593 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5594 10789, 10817, 10823, 10840, 10847
5596 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5598 Implemented by Ulrich Drepper.
5600 * Checking version of longjmp added that fails if an uninitialized stack
5601 frame would be created. Implemented by Ulrich Drepper.
5603 * STT_GNU_IFUNC is now supported in static executables.
5604 Implemented by H.J. Lu.
5606 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5608 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5609 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5610 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5611 Contributed by H.J. Lu.
5613 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5614 Implemented by Ulrich Drepper.
5616 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5618 Contributed by H.J. Lu.
5620 * Support for fma instruction in AVX on x86-64.
5621 Implemented by H.J. Lu and Ulrich Drepper.
5623 * AVX support in x86-64 auditing support in ld.so.
5624 Implemented by H.J. Lu.
5626 * STB_GNU_UNIQUE support added.
5627 Implemented by Ulrich Drepper.
5629 * Implement second fallback mode for optimized DNS lookup for even more
5630 broken environments. If two requests from the same port are not
5631 handled correctly close the socket and open a new one before sending
5632 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5633 can be used to select this mode right away, instead of rediscovering the
5634 necessity is every process again.
5635 Implemented by Ulrich Drepper.
5637 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5638 Implemented by Adam Tkac.
5640 * Optimized iconv conversions for S390x.
5641 Implemented by Andreas Krebbel.
5643 * Using condvars with PI mutexes is now more efficient due to kernel
5644 support for requeueing to PI futexes. NPTL support added for x86-64.
5645 Implemented by Ulrich Drepper.
5647 * New locales: ps_AF, my_MM
5651 * The following bugs are resolved with this release:
5653 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5654 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5655 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5656 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5657 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5659 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5660 Implemented by Ulrich Drepper.
5662 * New Linux interfaces: accept4, fallocate, fallocate64.
5663 Implemented by Ulrich Drepper.
5665 * Correct declarations of string function when used in C++ code. This
5666 could lead to compile errors for invalid C++ code.
5668 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5671 * New POSIX 2008 interface: psiginfo
5672 Implemented by Ulrich Drepper.
5674 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5675 Implemented by Ulrich Drepper.
5677 * Support for selecting between multiple function definitions at runtime
5678 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5680 * The libcrypt library can now use the hash function implementations in
5681 NSS. Implemented by Ulrich Drepper.
5683 * The malloc implementation can be compiled to be less memory efficient
5684 but higher performing in multi-threaded programs.
5685 Implemented by Ulrich Drepper.
5687 * New locales: nan_TW@latin, ks_IN
5689 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5690 Implemented by Ulrich Drepper.
5692 * Extended printf hook support. It is possible to use user-defined types
5693 and extend existing format specifiers.
5694 Implemented by Ulrich Drepper.
5696 * Handling for group shadow files has been added.
5697 Implemented by Ulrich Drepper.
5699 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5700 servers (the case, e.g., for some people using the built-in DNS
5701 server in ADSL modems/routers). There is a once-per-process timeout
5702 in case of a broken server. To avoid it, users can run nscd or put
5703 'options single-request' in /etc/resolv.conf.
5704 Implemented by Ulrich Drepper.
5708 * The following bugs are resolved with this release:
5710 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5711 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5712 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5713 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5714 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5716 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5717 up at the same time. Implemented by Ulrich Drepper.
5719 * TLS descriptors for LD and GD on x86 and x86-64.
5720 Implemented by Alexandre Oliva.
5722 * getaddrinfo now handles DCCP and UDPlite.
5723 Implemented by Ulrich Drepper.
5725 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5726 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5727 Implemented by Ulrich Drepper.
5729 * New implementation of memmem, strstr, and strcasestr which is O(n).
5730 Implemented by Eric Blake.
5732 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5734 * Implement "e" option for popen to open file descriptor with the
5735 close-on-exec flag set. Implemented by Ulrich Drepper.
5737 * Implement "b" mode for fmemopen. In this mode writes writes don't
5738 implicitly add a NUL byte and seeks from the end of the buffer really
5739 use the buffer end, not the string length as the basis.
5740 Implemented by Ulrich Drepper.
5742 * Many functions, exported and internal, now atomically set the close-on-exec
5743 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5745 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5747 Implemented by Pravin Satpute.
5749 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5753 * The following bugs are resolved with this release:
5755 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5756 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5757 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5758 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5759 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5760 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5761 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5763 * New locales: bo_CN, bo_IN, shs_CA.
5765 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5767 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5768 Implemented by Pravin Satpute.
5770 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5772 * nscd caches now all timeouts for DNS entries
5773 Implemented by Ulrich Drepper.
5775 * nscd is more efficient and wakes up less often.
5776 Implemented by Ulrich Drepper.
5778 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5779 vdprintf, and obstack_vprintf.
5780 Implemented by Jakub Jelinek.
5782 * Faster memset for x86-64.
5783 Implemented by Harsha Jagasia and H.J. Lu.
5785 * Faster memcpy on x86.
5786 Implemented by Ulrich Drepper.
5788 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5789 Implemented by Ulrich Drepper.
5791 * Faster sqrt and sqrtf implemention for some PPC variants.
5792 Implemented by Steven Munroe.
5796 * The following bugs are resolved with this release:
5798 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5799 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5800 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5801 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5802 5071, 5103, 5104, 5112, 5113, 5184, 5186
5804 * More checking functions: fread, fread_unlocked, open*, mq_open.
5805 Implemented by Jakub Jelinek and Ulrich Drepper.
5807 * Extend fortification to C++. Implemented by Jakub Jelinek.
5809 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5810 by not recognizing 'a' as a modifier when those specs are requested.
5811 Implemented by Jakub Jelinek.
5813 * PPC optimizations to math and string functions.
5814 Implemented by Steven Munroe.
5816 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5817 options to be passed. Implemented by Ulrich Drepper.
5819 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5821 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5822 Implemented by Ulrich Drepper.
5824 * Handle private futexes in the NPTL implementation.
5825 Implemented by Jakub Jelinek and Ulrich Drepper.
5827 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5828 Implemented by Roland McGrath and Ulrich Drepper.
5830 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5832 * SHA-256 and SHA-512 based password encryption.
5833 Implemented by Ulrich Drepper.
5835 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5836 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5839 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5840 Implemented by Ulrich Drepper.
5844 * The following bugs are resolved with this release:
5846 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5847 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5848 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5849 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5850 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5851 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5852 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5855 * New Linux interfaces: epoll_pwait, sched_getcpu.
5857 * New generic interfaces: strerror_l.
5859 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5863 * The following bugs are resolved with this release:
5865 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5866 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5867 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5868 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5869 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5870 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5871 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5872 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5873 3225, 3251, 3252, 3253, 3273
5875 * For Linux, the sorting of addresses returned by getaddrinfo now also
5876 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5877 Implemented by Ulrich Drepper.
5879 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5880 Implemented by Ulrich Drepper.
5882 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5884 * New iconv module for MIK. Contributed by Alexander Shopov.
5886 * For sites with broken group and/or passwd database, the auto-propagate
5887 option of nscd can prevent creating ID lookup entries from the results
5888 of a name lookup and vice versa. This usually is no problem but some
5889 site might have problems with the default behavior.
5890 Implemented by Ulrich Drepper.
5892 * Iterating over entire database in NIS can be slow. With the
5893 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5894 to trade time for memory. The entire database will be read at once.
5895 Implemented by Ulrich Drepper.
5897 * The interfaces introduced in RFC 3542 have been implemented by
5900 * Support for the new ELF hash table format was added by Ulrich Drepper.
5902 * Support for priority inheritance mutexes added by Jakub Jelinek and
5905 * Support for priority protected mutexes added by Jakub Jelinek.
5907 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5908 or_IN, csb_PL, fy_NL, sr_ME.
5912 * More overflow detection functions.
5914 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5915 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5917 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5918 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5919 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5920 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5921 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5922 by Masahide Washizawa.
5924 * It is now possible to install audit libraries for the dynamic linker using
5925 LD_AUDIT. Implemented by Ulrich Drepper.
5927 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5928 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5929 For a libc and libpthread that works well on Linux 2.4 kernels, we
5930 recommend using the stable 2.3 branch.
5932 * The new function open_wmemstream acts like open_memstream,
5933 but uses a wchar_t wide character buffer.
5935 * The new function ppoll is an improved version of poll, similar to pselect.
5937 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5938 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5939 renameat, unlinkat, linkat, symlinkat, readlinkat.
5941 * New Linux kernel system calls: unshare,
5942 inotify_init, inotify_add_watch, inotify_rm_watch.
5944 * The euidaccess function is now also known by the alias eaccess,
5945 for compatibility with some other systems.
5947 * Timezone data updated to 2006b version.
5951 * The following bugs are resolved with this release:
5953 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5954 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5955 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5956 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5957 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5958 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5960 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5962 * As of this release, GCC 4 can be used to compile the C Library.
5964 * Timezone data updated to 2005m version.
5968 * The following bugs are resolved with this release:
5970 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5971 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5972 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5973 777, 787, 821, 822, 823, 825
5975 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5979 * Support for RFC 3678. Real implementations exist only for Linux so far.
5980 Implemented by Ulrich Drepper.
5982 * nscd can now cache entries persistently. Expiring entries are reloaded.
5983 For speedups the cache can be shared in memory with client processes.
5984 Implemented by Ulrich Drepper.
5986 * nscd can now perform SELinux checks.
5987 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5989 * getaddrinfo queries are now cached. Canonical name lookup is performed
5991 Implemented by Ulrich Drepper.
5993 * The nothrow function attribute is used when headers are used by gcc when
5994 compiling C code. This can avoid significant amounts of exception
5997 * The malloc functions perform more error checking and are stricter when
5998 it comes to reacting on errors. The default action is to terminate
5999 the process after showing an error message. Implemented by Ulrich Drepper.
6001 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6002 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6004 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6005 namespaces using the new function dlmopen(). This feature is of course,
6006 like most other dynamic loading functionality, not available in statically
6007 linked applications. Implemented by Ulrich Drepper.
6009 * Low-overhead boundary checking variants of string and some stdio functions
6010 were added. These are to be used in conjunction with a gcc patch by
6011 Jakub Jelinek which adds calls to these functions if possible.
6012 Implemented by Jakub Jelinek and Ulrich Drepper.
6014 * Old code for several operating systems and machine architectures that
6015 have not been in working condition in a long time have been removed from
6016 the main source tree maintained by the GNU C Library's maintainers.
6017 These files are now reside in the separate `ports' source module
6018 that is usable as an add-on when building the library.
6022 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6023 interrogate the dynamic linker, compatible with the Solaris interface.
6025 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6026 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6028 * getifaddrs now uses the netlink interface on Linux to get its information.
6029 Implemented by Thorsten Kukuk.
6031 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6032 Implemented by Ulrich Drepper.
6034 * support for non-executable stacks on x86 has been added. Changes mostly
6037 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6040 * getaddrinfo now performs destination address selection according to
6045 * Thread-safe interfaces for many functions that access locale data
6046 were added in version 2.3, but these features were omitted from NEWS.
6047 Many functions have variants with an `_l' suffix that take a `locale_t'
6048 object as a parameter rather than consulting the current locale.
6049 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6050 create and maintain `locale_t' objects. Additionally, the new function
6051 `uselocale' sets "the current locale" (as used by functions not so
6052 parameterized) set for an individual thread. These features were added
6053 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6055 * The functions getresuid, getresgid, setresuid, and setresgid, which
6056 have long been available on Linux, are now declared in <unistd.h>
6057 and are now also available on the Hurd.
6059 * ELF thread-local storage support (TLS) now works on x86-64.
6061 * The new dynamic string token $LIB is expanded in shared library names.
6062 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6064 * Aldy Hernandez contributed complete software floating point support for
6065 PowerPC machines with no FPU.
6067 * fexecve is implemented on Linux.
6069 * The `btowc' function should work at least twice as fast due to
6070 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6072 * With approriate thread add-ons cancelable functions are now implemented
6073 in libc.so as well. No need to call the function in libpthread. This
6074 change allowed to finally disable the incorrect and expensive handling
6075 of weak definition in ld.so.
6077 * Yet more PLT entries in libc.so have been removed. We finally arrived
6078 at the bare minimum. Startup times improved appropriately.
6080 * Support for the new Linux/x86 system call interface was added. The
6081 AT_SYSINFO auxiliary vector entry is recognized and handled.
6085 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6088 * iconv (the program and the interface) now accepts empty names (excluding
6089 options like //TRANSLIT) to mean "use charset of current locale".
6091 * localedef can now transliterate characters in strings which are not in
6092 the provided charmap. The information from the input locale is used.
6094 * Prelinking support was added for ELF targets. This requires additional
6095 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6097 * Read-only stdio streams now use mmap to speed up operation by eliminating
6098 copying and buffer underflows. To use add 'm' to the mode string of
6099 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6101 * The malloc functions were completely rewritten by Wolfram Gloger based
6102 on Doug Lea's malloc-2.7.0.c.
6104 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6105 implementation of regex.
6107 * Bruno Haible upgraded the iconv and locale implementation to support
6110 * Contents of the LC_* and LANG environment variables in the CEN style are
6111 not recognized anymore. It never was used. Change by Ulrich Drepper.
6113 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6114 thread-local storage (TLS) ABI on some platforms.
6115 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6117 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6118 EUC-JISX0213, and TSCII.
6120 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6121 BSD-compatible interface for getting all network interface addresses.
6122 Implementation for IPv4 by Roland McGrath.
6124 * Loading of locale data is faster due to the introduction of a locale
6125 archive. Implemented by Roland McGrath and Ulrich Drepper.
6127 * Startup times are significantly reduced by not using exported functions
6128 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6131 * Steven Munroe contributed a port to PowerPC64/Linux.
6135 * The Hurd now uses the GNU libio implementation of stdio rather than the
6136 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6138 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6139 with the same behavior as the Linux system call of the same name.
6143 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6144 128-bit long double format.
6146 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6147 IBM1161, and IBM1162 charsets.
6149 * Andreas Jaeger contributed a port to x86-64/Linux.
6151 * Peter Bruin contributed a port to PowerPC/Hurd.
6153 * libc functions using I/O streams now can handle wide-oriented streams
6156 * optimizations in the dynamic linker. Binaries created by recent binutils
6157 versions start up quicker due to reduced time spent on relocations.
6159 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6163 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6164 asinh, atanh, j0 for the 128-bit long double format.
6166 * Bruno Haible updated all the code handling Unicode in some form to
6167 support Unicode 3.1.
6169 * Speed of regex for single-byte locales is back to previous levels.
6170 Patch by Isamu Hasegawa.
6172 * Alpha, SPARC, and IA-64 now also using floating stacks.
6174 * Startup time of internationalized applications greatly improved through
6175 iconv cache. Use iconvconfig to generate the cache file.
6176 Contributed by Ulrich Drepper.
6178 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6179 severe performance problems. Patch by David Mosberger.
6181 * The Hurd port got a lot more functionality like AIO, various stdio
6182 extensions, etc. Mainly done by Roland McGrath.
6184 * mtrace can now lookup symbols in shared libraries.
6188 * Intel's IA-64 math library is largely integrated. It provides fast and
6189 accurate implementatations for most basic and standard math functions
6190 in float, double, and long double format.
6192 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6193 and asin for the 96-bit long double format and asin, log, tan for the
6194 128-bit long double format.
6196 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6197 The basic double functions exist today. Contributed by Abraham Ziv
6198 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6199 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6201 * An asynchronous name lookup library was added. The interface is designed
6202 after POSIX AIO. The proposal was circulated beforehand to get comments.
6203 No negative ones came in. Implemented by Ulrich Drepper.
6205 * Port to S390/64bit contributed by Martin Schwidefsky
6206 <schwidefsky@de.ibm.com>.
6208 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6209 of functions for Linux/IA-64.
6211 * The RPC code is now thread safe. Threads can now use the same service
6212 of different services at the same time. Patch by Eric Norum
6213 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6215 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6216 family of functions for Linux/S390.
6218 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6219 of functions for Linux/x86.
6221 * Port to Linux/CRIS contributed by Axis Communications.
6225 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6226 we can now check for namespace violations and missing declarations. The
6227 result is that almost all headers are now Unix-compliant (as defined in
6228 the upcoming XPG6). The negative side is that some programs might need
6229 corrections, too, if they depend on the incorrect form of the headers in
6230 previous versions which defined too many symbols and included too many
6233 * regex now handles multibyte character sets correctly.
6234 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6236 * iconv (the program) does now conform to the upcoming XPG6 and handles
6237 charmaps. Instead of the charset names the path of charmaps can be
6238 provided and the conversion happens based on this data.
6239 Contributed by Ulrich Drepper.
6241 * The locale program now provides detailed information about the installed
6246 only lists the names of the supported locales
6250 provides details such as country, language, and codeset name.
6251 Contributed by Ulrich Drepper.
6255 * The gencat program now parses the input file according to the charset
6256 selected by the LC_CTYPE category. This is important for stateful
6257 character sets. To make generating catalogs easier there is a way
6258 to overwrite the charset selected by the locale: before the first
6259 message or $ quote line the catalog can contain a line like
6261 $ codeset=ISO-8859-2
6263 to select the charset (ISO-8859-2 in this case).
6265 Implemented by Shinya Hanataka and Ulrich Drepper.
6267 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6268 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6269 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6271 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6272 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6274 * The LANGUAGE environment variable is now ignored unless the locale is
6275 changed from the default "C" locale.
6277 * The usual bug fixes.
6281 * Greg McGary added runtime support for bounds checking using gcc's
6282 new -fbounded-pointers option. ix86 target is complete. PowerPC
6285 * Thorsten Kukuk added secure mode support to nscd.
6287 * The Berkeley db libraries have been removed.
6289 Related, the nss_db module is now in a separate package since it
6290 obviously requires a database library being available.
6292 * Wide character I/O streams implemented by Ulrich Drepper.
6294 * Functions from the extended socket API added by Ulrich Drepper.
6296 * Functions feenableexcept and fedisableexcept to control the
6297 behaviour of individual exceptions have been added by Andreas Jaeger.
6299 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6301 * The resolver code has been updated from bind 8.2.3-T5B which supports
6302 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6305 This change could in some situations effect backward compatibility. Since
6306 now `_res' is a thread-local instead of a global variable, modifying it
6307 in one thread does not have any effect in other threads.
6309 The resolver library was also extended to allow IPv6 as the transport
6310 protocol for the requests. This work was done by Stig Venaas.
6312 * Compatibility code for K&R C compilers has been removed from the
6313 header files. A ISO C compiler is needed to use the library
6314 (conforming to either C89 or C99 standard).
6316 * Complete rewrite of the localedef program to support multibyte character
6317 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6318 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6319 Implemented by Ulrich Drepper.
6321 Bruno Haible significantly improved the generation and use of the data
6322 structures for the wide character tables.
6324 * Plural handling in gettext implemented by Ulrich Drepper.
6326 * The utmp daemon has been removed.
6328 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6330 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6333 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6335 * POSIX barriers implemented by Kaz Kylheku.
6337 * POSIX spawn function family implemented by Ulrich Drepper.
6339 * POSIX spinlocks are now available.
6341 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6343 * the configure option --enable-kernel=X.Y.Z allows to strip out
6344 compatibility for kernel versions before X.Y.Z. This is currently only
6345 implemented for Linux.
6347 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6348 field sin6_scope_id. This means that all programs using IPv6 should be
6349 recompiled. Don't expect binary compatibility with previous glibc
6352 * various conversion modules for IBM character sets contributed by
6355 * IA-64 port by Jes Sorensen and HJ Lu.
6369 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6371 * New xdr functions are added; some rpc functions are now 64bit clean.
6373 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6375 * Fixed known incompatibilities with glibc 2.0.
6377 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6379 * Optimized a number of functions (especially the ELF dynamic loader).
6381 * Update timezone data files.
6383 * lots of charmaps corrections
6385 * some new locale definitions and charmaps
6390 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6391 conform to POSIX member type requirements. Symbol versions have been
6392 adjusted as needed within the library, and for direct use by applications,
6393 but there is potential for problems if third-party libraries use
6394 struct timeval as part of their interface. This does not present
6395 a problem for X and other "essential" system libraries.
6397 * An additional locale model to support C++ Standard Library locale
6398 model and probably more was implemented by Ulrich Drepper.
6400 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6403 * Miles Bader provided the `argp' function family to support hierachical
6404 command line argument parsing, layered on top of getopt.
6406 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6408 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6411 * scanf recognizes the %a and %A format for scanning floating point numbers.
6413 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6414 information and interfaces for the available integer types.
6416 * about 130 new math functions were added to implement the ISO C9x math
6419 * the new header <complex.h> contains definitions of the complex math
6420 functions from ISO C 9X.
6422 * the new header <tgmath.h> defines generic macros to use complex or
6423 real valued functions.
6425 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6427 * Andreas Jaeger provided a test suite for the math library.
6429 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6431 * Ulrich Drepper added character set conversion functions (iconv).
6433 * Optimized string functions have been added.
6435 * The localedata addon is now part of glibc.
6437 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6439 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6440 daemon for NSS (nscd).
6442 Missing a better place here are some numbers on improvements. Under
6443 Linux 2.1.125 un-tar-ing the kernel sources takes
6447 using local files 12.19s 6.88s 22.91s
6449 using NIS 13.92s 8.91s 26.34s
6451 using NIS & nscd 10.37s 7.34s 25.30s
6453 using NIS+ 27.57s 30.37s 640.46s
6455 using NIS+ & nscd 10.25s 7.83s 26.51s
6457 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6459 Keep in mind that non-namelookup related operations dominate above times.
6460 It was just a common complain that using NIS+ unpacking the kernel is
6463 [1] The old nscd implementation is not available anymore since it was
6464 distributed with glibc up to version 2.0.98 and thus is now replaced.
6466 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6468 * Mark Kettenis provided a Hesiod NSS module.
6470 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6471 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6473 * rcmd can now handle netgroups (Dick Streefland).
6475 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6478 * Support for the IPv6 protocol has been added to the socket API, as per the
6479 latest draft standards.
6481 * Support for Linux 2.2 has been added.
6483 * Interface changes relative to the latest 2.0.x release:
6484 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6485 addseverity NEW: Unix98
6486 alphasort64 NEW: LFS
6487 argp_err_exit_status NEW: argp, GNU ext
6488 argp_error NEW: argp, GNU ext
6489 argp_failure NEW: argp, GNU ext
6490 argp_help NEW: argp, GNU ext
6491 argp_parse NEW: argp, GNU ext
6492 argp_program_bug_address NEW: argp, GNU ext
6493 argp_program_version NEW: argp, GNU ext
6494 argp_program_version_hook NEW: argp, GNU ext
6495 argp_state_help NEW: argp, GNU ext
6496 argp_usage NEW: argp, GNU ext
6497 authdes_create NEW: Secure RPC
6498 authdes_getucred NEW: Secure RPC
6499 authdes_pk_create NEW: Secure RPC
6500 backtrace NEW: GNU ext.
6501 backtrace_symbols NEW: GNU ext.
6502 backtrace_symbols_fd NEW: GNU ext.
6504 cacosf NEW: ISO C 9x
6505 cacosh NEW: ISO C 9x
6506 cacoshf NEW: ISO C 9x
6507 cacoshl NEW: ISO C 9x
6508 cacosl NEW: ISO C 9x
6515 casinf NEW: ISO C 9x
6516 casinh NEW: ISO C 9x
6517 casinhf NEW: ISO C 9x
6518 casinhl NEW: ISO C 9x
6519 casinl NEW: ISO C 9x
6521 catanf NEW: ISO C 9x
6522 catanh NEW: ISO C 9x
6523 catanhf NEW: ISO C 9x
6524 catanhl NEW: ISO C 9x
6525 catanl NEW: ISO C 9x
6526 cbc_crypt NEW: Secure RPC
6530 ccoshf NEW: ISO C 9x
6531 ccoshl NEW: ISO C 9x
6537 cimagf NEW: ISO C 9x
6538 cimagl NEW: ISO C 9x
6539 clearerr_locked REMOVED
6540 clntunix_create NEW: sunrpc ext
6542 clog10 NEW: ISO C 9x
6543 clog10f NEW: ISO C 9x
6544 clog10l NEW: ISO C 9x
6554 cprojf NEW: ISO C 9x
6555 cprojl NEW: ISO C 9x
6557 crealf NEW: ISO C 9x
6558 creall NEW: ISO C 9x
6563 csinhf NEW: ISO C 9x
6564 csinhl NEW: ISO C 9x
6567 csqrtf NEW: ISO C 9x
6568 csqrtl NEW: ISO C 9x
6572 ctanhf NEW: ISO C 9x
6573 ctanhl NEW: ISO C 9x
6575 des_setparity NEW: Secure RPC
6576 ecb_crypt NEW: Secure RPC
6577 endutxent NEW: Unix98
6579 exp10f NEW: ISO C 9x
6580 exp10l NEW: ISO C 9x
6584 fattach NEW: STREAMS
6585 fdetach NEW: STREAMS
6589 feclearexcept NEW: ISO C 9x
6590 fegetenv NEW: ISO C 9x
6591 fegetexceptflag NEW: ISO C 9x
6592 fegetround NEW: ISO C 9x
6593 feholdexcept NEW: ISO C 9x
6595 feraiseexcept NEW: ISO C 9x
6596 ferror_locked REMOVED
6597 fesetenv NEW: ISO C 9x
6598 fesetexceptflag NEW: ISO C 9x
6599 fesetround NEW: ISO C 9x
6600 fetestexcept NEW: ISO C 9x
6601 feupdateenv NEW: ISO C 9x
6602 fflush_locked REMOVED
6606 fgets_unlocked NEW: GNU ext.
6607 fileno_locked REMOVED
6619 fputc_locked REMOVED
6620 fputs_unlocked NEW: GNU ext.
6621 fread_unlocked NEW: GNU ext.
6626 fstatvfs NEW: Unix98
6630 ftruncate64 NEW: LFS
6632 fwrite_unlocked NEW: GNU ext.
6633 gai_strerror NEW: IPv6
6637 getchar_locked REMOVED
6639 getdate_err NEW: Unix98
6640 getdate_r NEW: GNU ext.
6642 getnameinfo NEW: IPv6
6643 getnetname NEW: Secure RPC
6644 getpmsg NEW: STREAMS
6645 getpt NEW: Unix98 PTY
6646 getrlimit64 NEW: LFS
6647 getutxent NEW: Unix98
6648 getutxid NEW: Unix98
6649 getutxline NEW: Unix98
6650 glob64 NEW: GNU ext.
6651 globfree64 NEW: GNU ext.
6652 gnu_get_libc_release NEW: GNU ext.
6653 gnu_get_libc_version NEW: GNU ext.
6654 grantpt NEW: Unix98 PTY
6655 host2netname NEW: Secure RPC
6657 iconv_close NEW: iconv
6658 iconv_open NEW: iconv
6659 if_freenameindex NEW: IPv6
6660 if_indextoname NEW: IPv6
6661 if_nameindex NEW: IPv6
6662 if_nametoindex NEW: IPv6
6663 in6addr_any NEW: IPv6
6664 in6addr_loopback NEW: IPv6
6665 inet6_isipv4mapped NEW: IPv6
6666 isastream NEW: STREAMS
6667 iswblank NEW: GNU ext.
6668 key_decryptsession NEW: Secure RPC
6669 key_decryptsession_pk NEW: Secure RPC
6670 key_encryptsession NEW: Secure RPC
6671 key_encryptsession_pk NEW: Secure RPC
6672 key_gendes NEW: Secure RPC
6673 key_get_conv NEW: Secure RPC
6674 key_secretkey_is_set NEW: Secure RPC
6675 key_setnet NEW: Secure RPC
6676 key_setsecret NEW: Secure RPC
6677 llrint NEW: ISO C 9x
6678 llrintf NEW: ISO C 9x
6679 llrintl NEW: ISO C 9x
6680 llround NEW: ISO C 9x
6681 llroundf NEW: ISO C 9x
6682 llroundl NEW: ISO C 9x
6687 lrintf NEW: ISO C 9x
6688 lrintl NEW: ISO C 9x
6689 lround NEW: ISO C 9x
6690 lroundf NEW: ISO C 9x
6691 lroundl NEW: ISO C 9x
6693 makecontext NEW: Unix98
6694 mempcpy NEW: GNU ext.
6697 modify_ldt NEW: kernel
6701 nearbyint NEW: ISO C 9x
6702 nearbyintf NEW: ISO C 9x
6703 nearbyintl NEW: ISO C 9x
6704 netname2host NEW: Secure RPC
6705 netname2user NEW: Secure RPC
6706 nexttoward NEW: ISO C 9x
6707 nexttowardf NEW: ISO C 9x
6708 nexttowardl NEW: ISO C 9x
6712 passwd2des NEW: Secure RPC
6714 pow10f NEW: GNU ext.
6715 pow10l NEW: GNU ext.
6718 printf_size NEW: GNU ext.
6719 printf_size_info NEW: GNU ext.
6720 profil_counter REMOVED
6721 pthread_mutexattr_getkind_np REPLACED
6722 pthread_mutexattr_setkind_np REPLACED
6723 ptsname NEW: Unix98 PTY
6724 ptsname_r NEW: Unix98 PTY
6726 putchar_locked REMOVED
6727 putgrent NEW: GNU ext.
6729 putpmsg NEW: STREAMS
6730 pututxline NEW: Unix98
6734 readdir64_r NEW: LFS
6735 remquo NEW: ISO C 9x
6736 remquof NEW: ISO C 9x
6737 remquol NEW: ISO C 9x
6739 roundf NEW: ISO C 9x
6740 roundl NEW: ISO C 9x
6742 scalbln NEW: ISO C 9x
6743 scalblnf NEW: ISO C 9x
6744 scalblnl NEW: ISO C 9x
6746 sendfile NEW: kernel
6747 setcontext NEW: Unix98
6748 setrlimit64 NEW: LFS
6749 setutxent NEW: Unix98
6751 sigignore NEW: Unix98
6752 sigqueue NEW: POSIX.1b
6753 sigrelse NEW: Unix98
6754 sigset NEW: POSIX.1b
6755 sigtimedwait NEW: POSIX.1b
6756 sigwaitinfo NEW: POSIX.1b
6757 sincos NEW: GNU ext.
6758 sincosf NEW: GNU ext.
6759 sincosl NEW: GNU ext.
6763 strcasestr NEW: GNU ext.
6764 strtoimax NEW: ISO C 9x
6765 strtoumax NEW: ISO C 9x
6766 strverscmp NEW: GNU ext.
6767 svcauthdes_stats NEW: Secure RPC
6768 svcunix_create NEW: sunrpc etx
6769 svcunixfd_create NEW: sunrpc ext
6770 swapcontext NEW: Unix98
6771 tcgetsid NEW: Unix98 PTY
6772 tdestroy NEW: GNU ext.
6773 tgamma NEW: ISO C 9x
6774 tgammaf NEW: ISO C 9x
6775 tgammal NEW: ISO C 9x
6779 truncf NEW: ISO C 9x
6780 truncl NEW: ISO C 9x
6782 unlockpt NEW: Unix98 PTY
6783 updwtmpx NEW: Unix98
6784 user2netname NEW: Secure RPC
6785 utmpxname NEW: Unix98
6786 versionsort NEW: GNU ext.
6787 versionsort64 NEW: GNU ext.
6789 wcscasecmp NEW: GNU ext.
6790 wcsncasecmp NEW: GNU ext.
6791 wcsnlen NEW: GNU ext.
6792 wcstoimax NEW: ISO C 9x
6793 wcstoll NEW: ISO C 9x
6794 wcstoull NEW: ISO C 9x
6795 wcstoumax NEW: ISO C 9x
6797 wordexp NEW: POSIX.2
6798 wordfree NEW: POSIX.2
6799 write_profiling REMOVED
6800 xdecrypt NEW: Secure RPC
6801 xdr_authdes_cred NEW: Secure RPC
6802 xdr_authdes_verf NEW: Secure RPC
6803 xdr_cryptkeyarg NEW: Secure RPC
6804 xdr_cryptkeyarg2 NEW: Secure RPC
6805 xdr_cryptkeyres NEW: Secure RPC
6806 xdr_getcredres NEW: Secure RPC
6807 xdr_key_netstarg NEW: Secure RPC
6808 xdr_key_netstres NEW: Secure RPC
6809 xdr_keybuf NEW: Secure RPC
6810 xdr_keystatus NEW: Secure RPC
6811 xdr_netnamestr NEW: Secure RPC
6812 xdr_sizeof NEW: Secure RPC
6813 xdr_unixcred NEW: sunrpc ext
6814 xencrypt NEW: Secure RPC
6815 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6826 * inet_ntoa is thread-safe
6828 * updwtmp is moved from libutil to libc
6830 * rewrite of cbrt function
6832 * update of timezone data
6846 * add atoll function
6848 * fix complex problems in Berkeley DB code
6850 * fix math functions
6854 * fixed lots of header problems (especially Linux/GNU specific)
6856 * dynamic loader preserves all registers
6858 * Roland McGrath provided support for handling of auxiliary objects in
6859 the ELF dynamic loader.
6861 * support for parallel builds is improved
6865 * GNU extensions are no longer declared by default. To enable them you
6866 must define the macro `_GNU_SOURCE' in your program or compile with
6869 * The library has changed from using GNU ld symbol aliases to using weak
6870 symbols where available. The ELF object file format supports weak
6871 symbols; GNU ld also supports weak symbols in the a.out format. (There
6872 is also now support for other GNU ld extensions in ELF. Use the
6873 `--with-elf' option to configure to indicate you have ELF, and
6874 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6875 of many files which contained only symbol aliases, reducing the size of
6876 the source and the compiled library; many other files were renamed to
6877 less cryptic names previously occupied by the symbol alias files.
6878 There is a new header file <elf.h> for programs which operate on
6879 files in the ELF format.
6881 * Converted to Autoconf version 2, so `configure' has more options.
6882 Run `configure --help' to see the details.
6884 * The library can now be configured to build profiling, highly-optimized
6885 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6886 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6887 `configure' enable building these extra libraries. The shared library is
6888 built by default when using both ELF and GNU ld. When shared libraries
6889 are enabled, the new library `-ldl' is available for arbitrary run-time
6890 loading of shared objects; its interface is defined in <dlfcn.h>. The
6891 new header file <link.h> gives access to the internals of the run-time
6892 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6893 application of same name on other systems and it provides information
6894 about dynamically linked binaries.
6896 * The C library now provides the run-time support code for profiling
6897 executables compiled with `-pg'. Programs can control the profiling code
6898 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6899 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6900 the support for this file format was contributed by David Mosberger-Tang.
6902 * The math code has been replaced with a math library based on fdlibm from
6903 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6904 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6905 functions. The math functions now reside in a separate library, so
6906 programs using them will need to use `-lm' their linking commands.
6908 * John C. Bowman contributed optimized ix87 assembler inline functions.
6910 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6911 mechanism similar to that found in Solaris 2. This is now used for the
6912 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6913 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6914 file controls what services are used for each individual database. This
6915 works by loading shared libraries with names specified in `nsswitch.conf',
6916 so service modules can be changed or added at any time without even
6917 relinking any program. Currently there are the file, db, and NIS based
6918 NSS services available.
6920 * The new functions `strtoq' and `strtouq' parse integer values from
6921 strings, like `strtol' and `strtoul', but they return `long long int' and
6922 `unsigned long long int' values, respectively (64-bit quantities).
6924 * The new functions `strtof' and `strtold' parse floating-point values from
6925 strings, like `strtod', but they return `float' and `long double' values,
6926 respectively (on some machines `double' and `long double' are the same).
6928 * Ulrich Drepper has contributed new implementations of the floating-point
6929 printing and reading code used in the `printf' family of functions and
6930 `strtod', `strtof', and `strtold'. These new functions are perfectly
6931 accurate, and much faster than the old ones.
6933 * The implementation of the POSIX locale model was completely rewritten by
6934 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6935 to compile the POSIX locale definition.
6937 * The former dummy implementations of the strcoll and strxfrm function are
6938 now replaced by fully functional code contributed by Ulrich Drepper. The
6939 collation information comes from the POSIX locale definitions.
6941 * The new header <langinfo.h> defines an interface for accessing
6942 various locale-dependent data (using the locale chosen with `setlocale').
6944 * Ulrich Drepper has contributed a new suite of functions for operation on
6945 wide-character and multibyte-character strings, in <wchar.h>;
6946 and classification and case conversion of wide characters, in <wctype.h>.
6947 These new functions are conforming to the ISO C, Amendement 1 specification.
6949 * There is now a second implementation of the standard I/O library available.
6950 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6951 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6953 * You can now use positional parameter specifications in format strings
6954 for the `printf' and `scanf' families of functions. For example,
6955 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6956 ``Number 6, Mr Jones''. This is mainly useful when providing different
6957 format strings for different languages, whose grammars may dictate
6958 different orderings of the values being printed. To support this
6959 feature, the interface for `register_printf_handler' has changed; see
6960 the header file <printf.h> for details.
6962 * The `printf' and `scanf' families of functions now understand a new
6963 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6964 to group numbers as indicated by the locale; for `scanf' and friends, this
6965 says to accept as valid only a number with all the proper grouping
6966 separators in the right places. In the default "C" locale, numbers are
6967 not grouped; but locales for specific countries will define the usual
6968 conventions (i.e. separate thousands with `,' in the US locale).
6970 * The pgrp functions have been regularized, slightly incompatibly but much
6971 less confusingly. The core functions are now `getpgid' and `setpgid',
6972 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6973 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6974 provided for compatibility. There is no longer an incompatible `getpgrp'
6975 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6977 * The new header file <fts.h> and suite of functions simplify programs that
6978 operate on directory trees. This code comes from 4.4 BSD.
6980 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6981 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6982 NSS scheme used in glibc.
6984 * There is a new malloc debugging hook `__memalign_hook'.
6986 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6987 `unsigned int' in <sys/types.h>. These are for compatibility only and
6988 their use is discouraged.
6990 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6991 done differently, so that it works even without GNU ld.
6993 * New function `euidaccess' checks allowed access to a file like `access',
6994 but using the effective IDs instead of the real IDs.
6996 * The time zone data files have been updated for the latest and greatest
6997 local time conventions of the countries of the world.
6999 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7002 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7003 for formatting floating-point numbers. They are provided only for
7004 compatibility; new programs should use `sprintf' instead. There are
7005 also equivalent function for the `long double' floating-point type and
7006 all functions also exist in a reentrant form.
7008 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7009 functions for maintaining the login-record files (primarily of use to
7010 system programs such as `login'), and convenient functions for
7011 allocating and initializing a pseudo-terminal (pty) device.
7013 * Ulrich Drepper has contributed new support for System V style
7014 shared memory and IPC on systems that support it.
7016 * Ulrich Drepper has contributed several miscellaneous new functions found
7017 in System V: The `hsearch' family of functions provide an effective
7018 implementation of hash tables; `a64l' and `l64a' provide a very simple
7019 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7022 * Ulrich Drepper has contributed new reentrant counterparts for the
7023 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7025 * Ulrich Drepper has contributed new, highly-optimized versions of several
7026 string functions for the i486/Pentium family of processors.
7028 * Ulrich Drepper has updated the Linux-specific code, based largely
7029 on work done in Hongjiu Lu's version of GNU libc for Linux.
7030 The GNU library now supports Linux versions 2.0.10 and later,
7031 using the ELF object file format (i[3456]86-*-linux).
7033 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7035 * David Mosberger-Tang and Richard Henderson have ported the C library
7036 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7037 dynamic linking support for ELF/Alpha.
7039 * Richard Henderson contributed several Alpha optimized assembler function
7040 for arithmetic and string handling.
7042 * Ulrich Drepper has contributed a new set of message catalog functions to
7043 support multiple languages using the <libintl.h> interface, for use with
7044 his new package GNU gettext. Translation volunteers have contributed
7045 catalogs of the library's messages in Spanish, German, and Korean.
7047 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7048 program and the `catgets' function for reading the catalog files it
7049 creates. (The <libintl.h> interface is preferred; we include the
7050 <nl_types.h> interface using `catgets' only for source compatibility with
7051 programs already written to use it.)
7053 * New header file <values.h> gives SVID-compatible names for <limits.h>
7056 * Various new macros, declarations, and small header files for compatibility
7059 * New function `group_member' is a convenient way to check if a process has
7060 a given effective group ID.
7062 * When using GCC 2.7 and later, the socket functions are now declared in a
7063 special way so that passing an argument of type `struct sockaddr_in *',
7064 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7065 `struct sockaddr *' type, does not generate a type-clash warning.
7067 * New function `error' declared in header file <error.h> is a convenient
7068 function for printing error messages and optionally exiting; this is the
7069 canonical function used in GNU programs. The new functions `err', `warn',
7070 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7071 doing the same thing.
7073 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7074 POSIX.2 `glob' function to do ~ and {...} expansion.
7076 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7077 `clearenv' which is used in POSIX.9 is also available.
7079 * New function `getsid' returns session ID number on systems that support it.
7081 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7082 files <db.h> and <mpool.h> provide a rich set of functions for several
7083 types of simple databases stored in memory and in files, and <ndbm.h> is
7084 an old `ndbm'-compatible interface using the `db' functions. Link with
7085 `-ldb' to get these functions.
7087 * New macro `strdupa' copies a string like `strdup', but uses local stack
7088 space from `alloca' instead of dynamic heap space from `malloc'.
7090 * New function `strnlen' is like `strlen' but searches only a given maximum
7091 number of characters for the null terminator. `stpncpy', `strndup' and
7092 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7095 * New function `statfs' in header <sys/statfs.h>.
7097 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7098 provide convenient functions for operating on blocks of null-terminated
7101 * A new suite of functions in <utmp.h> handle all the details of reading
7102 and writing the utmp file.
7104 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7107 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7108 completely POSIX compliant and also implemented the extended functionality
7109 to handle alternate digit representation and alternate era date formats.
7111 * Ulrich Drepper provided an implementation of the `strptime' function
7112 defined in XPG4.2 which transforms a string into a `struct tm' value.
7114 * Paul Eggert provided the tzselect shell script as part of the timezone
7115 code. The shell script makes it easy to select the correct timezone
7118 * The implementation of the malloc family of functions is completely replaced
7119 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7120 The implementation uses the mmap function (if available) and it is
7121 optimized for the use in multi threaded programs.
7123 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7124 functions. This new functionality is usable by specifying a special
7125 salt string and it is compatible with implementation on *BSD systems.
7127 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7128 `getsubopt' to handle second level command line options, `bsd_signal'
7129 to access BSD style `signal' functionality, the obsolete `regexp' style
7132 * the `lchown' function is available on system which support this
7135 * The implementation of the shadow password handling function was contributed
7138 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7140 * POSIX.1g support was added. The <sys/select.h> header is available,
7141 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7142 implementation of `getaddrinfo'.
7146 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7148 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7149 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7151 * The new function `daemon' from 4.4 BSD is useful for server programs that
7152 want to put themselves in the background.
7154 * Joel Sherrill has contributed support for several standalone boards that
7155 run without an operating system.
7157 * `printf', `scanf' and friends now accept a `q' type modifier for long
7158 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7160 * All of the code taken from BSD (notably most of the math and networking
7161 routines) has been updated from the BSD 4.4-Lite release.
7163 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7165 * The new functions `getdomainname' and `setdomainname' fetch or change the
7166 YP/NIS domain name. These are system calls which exist on systems which
7169 * The time zone data files have been updated for the latest international
7172 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7173 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7177 * The C library now includes support for Sun RPC, from Sun's free
7178 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7179 are included. (There is still no support for YP.)
7181 * Tom Quinn has contributed a port of the C library to SGI machines running
7182 Irix 4 (mips-sgi-irix4).
7184 * The new `lockf' function is a simplified interface to the locking
7185 facilities of `fcntl', included for compatibility.
7187 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7189 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7191 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7194 * The error message printed by `assert' for a failed assertion now includes
7195 the name of the program (if using GNU ld) and the name of the calling
7196 function (with versions of GCC that support this).
7198 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7200 * The library now includes the <sys/mman.h> header file and memory
7201 management functions `mmap', `munmap', `mprotect', `msync', and
7202 `madvise', on systems that support those facilities.
7204 * The interface for `mcheck' has changed slightly: the function called to
7205 abort the program when an allocation inconsistency is detected now takes
7206 an argument that indicates the type of failure. The new function
7207 `mprobe' lets you request a consistency check for a particular block at
7208 any time (checks are normally done only when you call `free' or `realloc'
7211 * It is now possible to easily cross-compile the C library, building on one
7212 system a library to run on another machine and/or operating system. All
7213 you need to do is set the variable `HOST_CC' in `configparms' to the
7214 native compiler for programs to run on the machine you are building on (a
7215 few generator programs are used on Unix systems); set `CC' to the
7218 * The new function `fexecve' (only implemented on the GNU system) executes
7219 a program file given a file descriptor already open on the file.
7223 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7224 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7226 * You can set the variable `libprefix' in `configparms' to specify a prefix
7227 to be prepended to installed library files; this makes it easy to install
7228 the GNU C library to be linked as `-lgnuc' or whatever.
7230 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7231 copies a limited number of characters from a string, and returns the
7232 address of the last character written.
7234 * You no longer need to check for whether the installed `stddef.h' is
7235 compatible with the GNU C library. configure now checks for you.
7237 * You can now define a per-stream `fileno' function to convert the
7238 stream's cookie into an integral file descriptor.
7240 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7241 allocates zero bytes of storage, and returns a unique pointer which
7242 you can pass to `realloc' or `free'. The behavior is undefined if
7243 you dereference this pointer.
7245 * The C library now runs on Sony NEWS m68k machines running either
7246 NewsOS 3 or NewsOS 4.
7248 * The new `syscall' function is a system-dependent primitive function
7249 for invoking system calls. It has the canonical behavior on Unix
7250 systems, including unreliable return values for some calls (such as
7251 `pipe', `fork' and `getppid').
7253 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7254 to `EAGAIN', which is the preferred name. On systems whose kernels
7255 use two distinct codes, the C library now translates EWOULDBLOCK to
7256 EAGAIN in every system call function.
7260 * The GNU C Library Reference Manual is now distributed with the library.
7261 `make dvi' will produce a DVI file of the printed manual.
7262 `make info' will produce Info files that you can read on line using C-h i
7263 in Emacs or the `info' program.
7264 Please send comments on the manual to bug-glibc-manual@gnu.org.
7266 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7268 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7270 * Jason Merrill has contributed a port to the Sequent Symmetry running
7271 Dynix version 3 (i386-sequent-dynix).
7273 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7274 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7276 * New function `memory_warnings' lets you arrange to get warnings when
7277 malloc is running out of memory to allocate, like Emacs gives you.
7279 * The C library now contains the relocating allocator used in Emacs 19 for
7280 its editing buffers. This allocator (ralloc) minimizes allocation
7281 overhead and fragmentation by moving allocated regions around whenever it
7282 needs to. You always refer to a ralloc'd region with a "handle" (a
7283 pointer to a pointer--an object of type `void **').
7285 * There is a new `printf' format: `%m' gives you the string corresponding
7286 to the error code in `errno'.
7288 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7289 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7290 pass, the `a' modifier says to fill in a `char **' you pass with a
7293 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7294 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7295 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7297 * `mkstemp' is a traditional Unix function to atomically create and open a
7298 uniquely-named temporary file.
7302 * The standard location for the file that says what the local timezone is
7303 has changed again. It is now `/usr/local/etc/localtime' (or more
7304 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7306 * The distribution no longer contains any files with names longer than 14
7309 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7310 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7312 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7316 * The configuration process has changed quite a bit. The `configure'
7317 script is now used just like the configuration scripts for other GNU
7318 packages. The `sysdeps' directory hierarchy is much rearranged.
7319 The file `INSTALL' explains the new scheme in detail.
7321 * The header files no longer need to be processed into ANSI C and
7322 traditional C versions. There is just one set of files to install, and
7323 it will work with ANSI or old C compilers (including `gcc -traditional').
7325 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7326 MIPS DECStation running Ultrix 4.
7328 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7329 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7330 made itself into a shared library.
7332 * Yet further improved support for the i386, running 4.3 BSD-like systems
7333 (such as Mach 3 with the Unix single-server), or System V.
7335 * New function `strncasecmp' to do case-insensitive string comparison
7336 with limited length.
7338 * New function `strsep' is a reentrant alternative to `strtok'.
7340 * New functions `scandir' and `alphasort' for searching directories.
7342 * New function `setenv' is a better interface to `putenv'.
7344 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7345 function for traversing a directory tree.
7347 * The GNU obstack package is now also part of the C library.
7348 The new function `open_obstack_stream' creates a stdio stream that
7349 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7350 formatted output directly to an obstack.
7352 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7353 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7355 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7357 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7358 things to your strings.
7360 * There are some new test programs: test-fseek, testmb, and testrand.
7362 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7363 These ports are not finished, but are a good starting place for really
7364 supporting those systems.
7366 * `/etc/localtime' is now the standard location for the file that says what
7367 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7368 This follows the general principle that `/etc' is the place for all local
7369 configuration files.
7371 * The C library header files now use `extern "C"' when used by the C++
7372 compiler, so the C library should now work with C++ code.
7374 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7375 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7378 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7379 function which uses the `merge sort' algorithm, and is said to be
7380 significantly faster than the old GNU `qsort' function. Merge sort is
7381 now the standard `qsort' function. The new algorithm can require a lot
7382 of temporary storage; so, the old sorting function is called when the
7383 required storage is not available.
7385 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7386 provides the Unix `crypt' function, plus some other entry points.
7388 * The code and header files taken from 4.4 BSD have been updated with the
7389 latest files released from Berkeley.
7391 ----------------------------------------------------------------------
7394 Permission is granted to anyone to make or distribute verbatim copies
7395 of this document as received, in any medium, provided that the
7396 copyright notice and this permission notice are preserved,
7397 thus giving the recipient permission to redistribute in turn.
7399 Permission is granted to distribute modified versions
7400 of this document, or of portions of it,
7401 under the above conditions, provided also that they
7402 carry prominent notices stating who last changed them.
7405 version-control: never