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  • glibc-2.34.9000   Open master branch for glibc 2.35 development
  • glibc-2.34   The GNU C Library version 2.34 is now available The GNU C Library ================= The GNU C Library version 2.34 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the X.Y release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.34 ===================== Major new features: * In order to support smoother in-place-upgrades and to simplify the implementation of the runtime all functionality formerly implemented in the libraries libpthread, libdl, libutil, libanl has been integrated into libc. New applications do not need to link with -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility, empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are provided, so that the linker options keep working. Applications which have been linked against glibc 2.33 or earlier continue to load the corresponding shared objects (which are now empty). The integration of those libraries into libc means that additional symbols become available by default. This can cause applications that contain weak references to take unexpected code paths that would only have been used in previous glibc versions when e.g. preloading libpthread.so.0, potentially exposing application bugs. * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined, PTHREAD_STACK_MIN is no longer constant and is redefined to sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register sets for modern architectural features like Arm SVE. * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ) and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports dynamic sized register sets for modern architectural features like Arm SVE. * The dynamic linker implements the --list-diagnostics option, printing a dump of information related to IFUNC resolver operation and glibc-hwcaps subdirectory selection. * On Linux, the function execveat has been added. It operates similar to execve and it is is already used to implement fexecve without requiring /proc to be mounted. However, different than fexecve, if the syscall is not supported by the kernel an error is returned instead of trying a fallback. * The ISO C2X function timespec_getres has been added. * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO C2X, is supported to enable declarations of functions defined in Annex F of C2X. Those declarations are also enabled when __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is defined, and when _GNU_SOURCE is defined. * On powerpc64*, glibc can now be compiled without scv support using the --disable-scv configure option. * Add support for 64-bit time_t on configurations like x86 where time_t is traditionally 32-bit. Although time_t still defaults to 32-bit on these configurations, this default may change in future versions. This is enabled with the _TIME_BITS preprocessor macro set to 64 and is only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is only enabled for Linux and the full support requires a minimum kernel version of 5.1. * The main gconv-modules file in glibc now contains only a small set of essential converter modules and the rest have been moved into a supplementary configuration file gconv-modules-extra.conf in the gconv-modules.d directory in the same GCONV_PATH. Similarly, external converter modules directories may have supplementary configuration files in a gconv-modules.d directory with names ending with .conf to logically classify the converter modules in that directory. * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used to configure the size of the thread stack cache. * The function _Fork has been added as an async-signal-safe fork replacement since Austin Group issue 62 droped the async-signal-safe requirement for fork (and it will be included in the future POSIX standard). The new _Fork function does not run any atfork function neither resets any internal state or lock (such as the malloc one), and only sets up a minimal state required to call async-signal-safe functions (such as raise or execve). This function is currently a GNU extension. * On Linux, the close_range function has been added. It allows efficiently closing a range of file descriptors on recent kernels (version 5.9). * The function closefrom has been added. It closes all file descriptors greater than or equal to a given integer. This function is a GNU extension, although it is also present in other systems. * The posix_spawn_file_actions_addclosefrom_np function has been added, enabling posix_spawn and posix_spawnp to close all file descriptors greater than or equal to a given integer. This function is a GNU extension, although Solaris also provides a similar function. Deprecated and removed features, and other changes affecting compatibility: * The function pthread_mutex_consistent_np has been deprecated; programs should use the equivalent standard function pthread_mutex_consistent instead. * The function pthread_mutexattr_getrobust_np has been deprecated; programs should use the equivalent standard function pthread_mutexattr_getrobust instead. * The function pthread_mutexattr_setrobust_np has been deprecated; programs should use the equivalent standard function pthread_mutexattr_setrobust instead. * The function pthread_yield has been deprecated; programs should use the equivalent standard function sched_yield instead. * The function inet_neta declared in <arpa/inet.h> has been deprecated. * Various rarely-used functions declared in <resolv.h> and <arpa/nameser.h> have been deprecated. Applications are encouraged to use dedicated DNS processing libraries if applicable. For <resolv.h>, this affects the functions dn_count_labels, fp_nquery, fp_query, fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname, p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time, p_type, putlong, putshort, res_hostalias, res_isourserver, res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos, sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs, ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename, ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated. * Various symbols previously defined in libresolv have been moved to libc in order to prepare for libresolv moving entirely into libc (see earlier entry for merging libraries into libc). The symbols __dn_comp, __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok, __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain, __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain, __res_search, __res_send formerly in libresolv have been renamed and no longer have a __ prefix. They are now available in libc. * The pthread cancellation handler is now installed with SA_RESTART and pthread_cancel will always send the internal SIGCANCEL on a cancellation request. It should not be visible to applications since the cancellation handler should either act upon cancellation (if asynchronous cancellation is enabled) or ignore the cancellation internal signal. However there are buggy kernel interfaces (for instance some CIFS versions) that could still see a spurious EINTR error when cancellation interrupts a blocking syscall. * Previously, glibc installed its various shared objects under versioned file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6) were provided as symbolic links. Starting with glibc 2.34, the shared objects are installed under their ABI sonames directly, without symbolic links. This increases compatibility with distribution package managers that delete removed files late during the package upgrade or downgrade process. * The symbols mallwatch and tr_break are now deprecated and no longer used in mtrace. Similar functionality can be achieved by using conditional breakpoints within mtrace functions from within gdb. * The __morecore and __after_morecore_hook malloc hooks and the default implementation __default_morecore have been removed from the API. Existing applications will continue to link against these symbols but the interfaces no longer have any effect on malloc. * Debugging features in malloc such as the MALLOC_CHECK_ environment variable (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been disabled by default in the main C library. Users looking to use these features now need to preload a new debugging DSO libc_malloc_debug.so to get this functionality back. * The deprecated functions malloc_get_state and malloc_set_state have been moved from the core C library into libc_malloc_debug.so. Legacy applications that still use these functions will now need to preload libc_malloc_debug.so in their environment using the LD_PRELOAD environment variable. * The deprecated memory allocation hooks __malloc_hook, __realloc_hook, __memalign_hook and __free_hook are now removed from the API. Compatibility symbols are present to support legacy programs but new applications can no longer link to these symbols. These hooks no longer have any effect on glibc functionality. The malloc debugging DSO libc_malloc_debug.so currently supports hooks and can be preloaded to get this functionality back for older programs. However this is a transitional measure and may be removed in a future release of the GNU C Library. Users may port away from these hooks by writing and preloading their own malloc interposition library. Changes to build and runtime requirements: * On Linux, the shm_open, sem_open, and related functions now expect the file shared memory file system to be mounted at /dev/shm. These functions no longer search among the system's mount points for a suitable replacement if /dev/shm is not available. Security related changes: CVE-2021-27645: The nameserver caching daemon (nscd), when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. Reported by Chris Schanzle. CVE-2021-33574: The mq_notify function has a potential use-after-free issue when using a notification type of SIGEV_THREAD and a thread attribute with a non-default affinity mask. CVE-2021-35942: The wordexp function may overflow the positional parameter number when processing the expansion resulting in a crash. Reported by Philippe Antoine. The following bugs are resolved with this release: [4737] libc: fork is not async-signal-safe [5781] math: Slow dbl-64 sin/cos/sincos for special values [10353] libc: Methods for deleting all file descriptors greater than given integer (closefrom) [14185] glob: fnmatch() fails when '*' wildcard is applied on the file name containing multi-byte character(s) [14469] math: Inaccurate j0f function [14470] math: Inaccurate j1f function [14471] math: Inaccurate y0f function [14472] math: Inaccurate y1f function [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a random thread [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM crashes if it fails dlsym() twice [15648] nptl: multiple definition of `__lll_lock_wait_private' [16063] nptl: Provide a pthread_once variant in libc directly [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined [17145] libc: syslog with LOG_CONS leaks console file descriptor [17183] manual: description of ENTRY struct in <search.h> in glibc manual is incorrect [18435] nptl: pthread_once hangs when init routine throws an exception [18524] nptl: Missing calloc error checking in __cxa_thread_atexit_impl [19329] dynamic-link: dl-tls.c assert failure at concurrent pthread_create and dlopen [19366] nptl: returning from a thread should disable cancellation [19511] nptl: 8MB memory leak in pthread_create in case of failure when non-root user changes priority [20802] dynamic-link: getauxval NULL pointer dereference after static dlopen [20813] nptl: pthread_exit is inconsistent between libc and libpthread [22057] malloc: malloc_usable_size is broken with mcheck [22668] locale: LC_COLLATE: the last character of ellipsis is not ordered correctly [23323] libc: [RFE] CSU startup hardening. [23328] malloc: Remove malloc hooks and ensure related APIs return no data. [23462] dynamic-link: Static binary with dynamic string tokens ($LIB, $PLATFORM, $ORIGIN) crashes [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign [23554] nptl: pthread_getattr_np reports wrong stack size with MULTI_PAGE_ALIASING [24106] libc: Bash interpreter in ldd script is taken from host [24773] dynamic-link: dlerror in an secondary namespace does not use the right free implementation [25036] localedata: Update collation order for Swedish [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause shm_open to pick wrong directory [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic crash in IFUNC resolver due to stack canary (--enable-stack- protector=all) [26874] build: -Warray-bounds in _IO_wdefault_doallocate [26983] math: [x86_64] x86_64 tgamma has too large ULP error [27111] dynamic-link: pthread_create and tls access use link_map objects that may be concurrently freed by dlclose [27132] malloc: memusagestat is linked to system librt, leading to undefined symbols on major version upgrade [27136] dynamic-link: dtv setup at thread creation may leave an entry uninitialized [27249] libc: libSegFault.so does not output signal number properly [27304] nptl: pthread_cond_destroy does not pass private flag to futex system calls [27318] dynamic-link: glibc fails to load binaries when built with -march=sandybridge: CPU ISA level is lower than required [27343] nss: initgroups() SIGSEGVs when called on a system without nsswich.conf (in a chroot) [27346] dynamic-link: x86: PTWRITE feature check is missing [27389] network: NSS chroot hardening causes regressions in chroot deployments [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose [27444] libc: sysconf reports unsupported option (-1) for _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33 [27462] nscd: double-free in nscd (CVE-2021-27645) [27468] malloc: aarch64: realloc crash with heap tagging: FAIL: malloc/tst-malloc-thread-fail [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3 is present [27522] glob: glob, glob64 incorrectly marked as __THROW [27555] dynamic-link: Static tests fail with --enable-stack- protector=all [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns information for the current directory [27577] dynamic-link: elf/ld.so --help doesn't work [27605] libc: tunables can't control xsave/xsavec selection in dl_runtime_resolve_* [27623] libc: powerpc: Missing registers in sc[v] clobbers list [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on containers [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g. _nss_files_getcanonname_r) from within a dlmopen namespace. [27648] libc: FAIL: misc/tst-select [27650] stdio: vfscanf returns too early if a match is longer than INT_MAX [27651] libc: Performance regression after updating to 2.33 [27655] string: Wrong size calculation in string/test-strnlen.c [27706] libc: select fails to update timeout on error [27709] libc: arm: FAIL: debug/tst-longjmp_chk2 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and tries resolving them lazily [27744] nptl: Support different libpthread/ld.so load orders in libthread_db [27749] libc: Data race __run_exit_handlers [27761] libc: getconf: Segmentation fault when passing '-vq' as argument [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295 exceeds maximum object size 2147483647 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to not set ENOMEM [27872] build: Obsolete configure option --enable-stackguard- randomization [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets [27892] libc: powerpc: scv ABI error handling fails to check IS_ERR_VALUE [27896] nptl: mq_notify does not handle separately allocated thread attributes (CVE-2021-33574) [27901] libc: TEST_STACK_ALIGN doesn't work [27902] libc: The x86-64 clone wrapper fails to align child stack [27914] nptl: Install SIGSETXID handler with SA_ONSTACK [27939] libc: aarch64: clone does not align the stack [27968] libc: s390x: clone does not align the stack [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942) [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5) with n >= 0x80000000 [28028] malloc: malloc: tcache shutdown sequence does not work if the thread never allocated anything [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM [28064] string: x86_64:wcslen implementation list has wcsnlen [28067] libc: FAIL: posix/tst-spawn5 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration on older kernels [28075] nis: Out-of-bounds static buffer read in nis_local_domain [28089] build: tst-tls20 fails when linker defaults to --as-needed [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain AMD64 cpus [28091] network: ns_name_skip may return 0 for domain names without terminator Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.34 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Alejandro Colomar \(man-pages\) Alexandra Hájková Alice Xu Alyssa Ross Andreas Roeseler Andreas Schwab Anton Blanchard Arjun Shankar Armin Brauns Bruno Haible Carlos O'Donell Cooper Qu DJ Delorie Dan Raymond Darius Rad David Hughes Fangrui Song Florian Weimer H.J. Lu Hanataka Shinya Hugo Gabriel Eyherabide Jakub Jelinek JeffyChen John David Anglin Joseph Myers Khem Raj Lirong Yuan Lucas A. M. Magalhaes Lukasz Majewski Maninder Singh Mark Harris Martin Sebor Matheus Castanho Michal Nazarewicz Mike Hommey Naohiro Tamura Nicholas Piggin Noah Goldstein Paul Eggert Paul Zimmermann Pedro Franco de Carvalho Raoni Fassina Firmino Raphael Moreira Zinsly Romain GEISSLER Sajan Karumanchi Samuel Thibault Sebastian Rasmussen Sergei Trofimovich Shen-Ta Hsieh Siddhesh Poyarekar Stafford Horne Stefan Liebler Sunil K Pandey Szabolcs Nagy Tulio Magno Quites Machado Filho Vineet Gupta Vitaly Buka Vitaly Chikunov Wilco Dijkstra Xeonacid Xiaoming Ni Yang Xu liuhongt noah Érico Nogueira
  • glibc-2.33.9000   Open master branch for glibc 2.34 development
  • glibc-2.33   The GNU C Library ================= The GNU C Library version 2.33 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.32 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.33 ===================== Major new features: * The dynamic linker accepts the --list-tunables argument which prints all the supported tunables. This option is disable if glibc is configured with tunables disabled (--enable-tunables=no). * The dynamic linker accepts the --argv0 argument and provides opportunity to change argv[0] string. * The dynamic linker loads optimized implementations of shared objects from subdirectories under the glibc-hwcaps directory on the library search path if the system's capabilities meet the requirements for that subdirectory. Initially supported subdirectories include "power9" and "power10" for the powerpc64le-linux-gnu architecture, "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3", "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the subdirectory names correspond to the vendor-independent x86-64 microarchitecture levels defined in the x86-64 psABI supplement. * The new --help option of the dynamic linker provides usage and information and library search path diagnostics. * The mallinfo2 function is added to report statistics as per mallinfo, but with larger field widths to accurately report values that are larger than fit in an integer. * Add <sys/platform/x86.h> to provide query macros for x86 CPU features. * Support for the RISC-V ISA running on Linux has been expanded to run on 32-bit hardware. This is supported for the following ISA and ABI pairs: - rv32imac ilp32 - rv32imafdc ilp32 - rv32imafdc ilp32d The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils 2.28. * A new fortification level _FORTIFY_SOURCE=3 is available. At this level, glibc may use additional checks that may have an additional performance overhead. At present these checks are available only on LLVM 9 and later. The latest GCC available at this time (10.2) does not support this level of fortification. Deprecated and removed features, and other changes affecting compatibility: * The mallinfo function is marked deprecated. Callers should call mallinfo2 instead. * When dlopen is used in statically linked programs, alternative library implementations from HWCAP subdirectories are no longer loaded. Instead, the default implementation is used. * The deprecated <sys/vtimes.h> header and the function vtimes have been removed. To support old binaries, the vtimes function continues to exist as a compatibility symbol. Applications should use the getrlimit or prlimit. * Following a change in the tzdata 2018a release upstream, the zdump program is now installed in the /usr/bin subdirectory. Previously, the /usr/sbin subdirectory was used. * On s390(x), the type float_t is now derived from the macro __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being hardcoded to double. This does not affect the ABI of any libraries that are part of the GNU C Library, but may affect the ABI of other libraries that use this type in their interfaces. The new definition improves consistency with compiler behavior in many scenarios. * A future version of glibc will stop loading shared objects from the "tls" subdirectories on the library search path, the subdirectory that corresponds to the AT_PLATFORM system name, and also stop employing the legacy AT_HWCAP search mechanism. Applications should switch to the new glibc-hwcaps mechanism instead; if they do not do that, only the baseline version (directly from the search path directory) will be loaded. Changes to build and runtime requirements: * On Linux, the system administrator needs to configure /dev/pts with the intended access modes for pseudo-terminals. glibc no longer attemps to adjust permissions of terminal devices. The previous glibc defaults ("tty" group, user read/write and group write) already corresponded to what most systems used, so that grantpt did not perform any adjustments. * On Linux, the posix_openpt and getpt functions no longer attempt to use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists (and pseudo-terminals are supported), a devpts file system is mounted on /dev/pts. Current systems already meet these requirements. * s390x requires GCC 7.1 or newer. See gcc Bug 98269. Security related changes: CVE-2021-3326: An assertion failure during conversion from the ISO-20220-JP-3 character set using the iconv function has been fixed. This assertion was triggered by certain valid inputs in which the converted output contains a combined sequence of two wide characters crossing a buffer boundary. Reported by Tavis Ormandy. CVE-2020-27618: An infinite loop has been fixed in the iconv program when invoked with input containing redundant shift sequences in the IBM1364, IBM1371, IBM1388, IBM1390, or IBM1399 character sets. CVE-2020-29562: An assertion failure has been fixed in the iconv function when invoked with UCS4 input containing an invalid character. CVE-2019-25013: A buffer overflow has been fixed in the iconv function when invoked with EUC-KR input containing invalid multibyte input sequences. The following bugs are resolved with this release: [10635] libc: realpath portability patches [16124] dynamic-link: ld.so should allow to change argv[0] [17924] malloc: 'free' should not set errno [18683] libc: Linux faccessat implementation can incorrectly ignore AT_EACCESS [22899] libc: Use 64-bit readdir() in generic POSIX getcwd() [23249] libc: Epyc and other current AMD CPUs do not select the "haswell" platform subdirectory [24080] dynamic-link: Definition of "haswell" platform is inconsistent with GCC [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable- stack-protector=all [24941] libc: Make grantpt usable after multi-threaded fork in more cases [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway [24973] locale: iconv encounters segmentation fault when converting 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013) [25399] string: undefined reference to `__warn_memset_zero_len' when changing gnuc version [25859] libc: glibc parser for /sys/devices/system/cpu/online is incorrect [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask bits [25971] libc: s390 bits/hwcap.h out of sync with kernel [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors [26100] libc: Race in syslog(3) with regards to tag printing. [26124] libc: Export <cpu-features.h> [26130] nscd: Inconsistent nscd cache during pruning [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized [26224] locale: iconv hangs when converting some invalid inputs from several IBM character sets (CVE-2020-27618) [26341] libc: realpath cyclically call __alloca(path_max) to consume too much stack space [26343] manual: invalid documented return type for strerrorname_np(), strerrordesc_np(), sigdescr_np(), sigabbrev_np() [26376] libc: Namespace violation in stdio.h and sys/stat.h if build with optimization. [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT anymore [26394] time: [2.33 Regression] FAIL: nptl/tst-join14 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on non-FMA4 system [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative [26553] libc: mtx_init allows type set to "mtx_recursive" only [26555] string: strerrorname_np does not return the documented value [26592] libc: pointer arithmetic overflows in realpath [26600] network: Transaction ID collisions cause slow DNS lookups in getaddrinfo [26606] libc: [2.33 Regression] pselect is broken on x32 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc [26620] glob: fnmatch with collating symbols results in segmentation fault [26625] libc: [2.33 Regression] CET is disabled [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is at the end of a memory mapping [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified by the caller to the kernel [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage [26647] build: [-Werror=array-parameter=] due to different declarations for __sigsetjmp [26648] libc: mkstemp is likely to fail on systems with non-stricly- monotonic clocks [26649] stdio: printf should handle non-normal x86 long double numbers gracefully (CVE-2020-29573) [26686] build: -Warray-parameter instances building with GCC 11 [26687] build: -Warray-bounds instances building with GCC 11 [26690] stdio: Aliasing violation in __vfscanf_internal [26691] nptl: Use a minimum guard size of 64 KiB on aarch64 [26726] build: GCC warning calling new_composite_name with an array of one element [26736] libc: FAIL: misc/tst-sysvshm-linux [26737] libc: Random FAIL: rt/tst-shm [26791] libc: Missing O_CLOEXEC in sysconf.c [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly lazy bound [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on PI mutexes [26818] string: aarch64: string tests may run ifunc variants that are not safe [26821] libc: Memory leak test failures on Fedora 33 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk: FSGSBASE/LM/RDRAND check failure [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit platform [26853] libc: aarch64: Missing unwind information in statically linked startup code [26923] locale: Assertion failure in iconv when converting invalid UCS4 (CVE-2020-29562) [26926] dynamic-link: aarch64: library dependencies are not bti protected [26932] libc: sh: Multiple floating point functions defined as stubs only since 2.31 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is locked [26988] dynamic-link: aarch64: BTI mprotect address is not page aligned [27002] build: libc_freeres_fn build failure with GCC 11 [27004] dynamic-link: ld.so is miscompiled by GCC 11 [27008] dynamic-link: ld.so.cache should have endianness markup [27042] libc: [alpha] anonymous union in struct stat confuses detection logic [27053] libc: Conformance regression in system(3) (and probably also pclose(3)) [27072] dynamic-link: static pie ifunc resolvers run before hwcap is setup [27077] network: Do not reload /etc/nsswitch.conf from chroot [27083] libc: Unsafe unbounded alloca in addmntent [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not work [27130] string: "rep movsb" performance issue [27150] libc: alpha: wait4() is unavailable in static linking [27177] dynamic-link: GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't work [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module related to combining characters (CVE-2021-3326) Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.33 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Alexandra Hájková Alistair Francis Andreas Schwab Anssi Hannula Arjun Shankar Benno Schulenberg Carlos O'Donell Chen Li Cooper Qu Corinna Vinschen DJ Delorie Dmitry V. Levin Fangrui Song Florian Weimer Guillaume Gardet H.J. Lu Jakub Jelinek Jangwoong Kim Jeremie Koenig Jim Wilson John David Anglin John McCabe Jonathan Wakely Jonny Grant Joseph Myers Lode Willems Lucas A. M. Magalhaes Lukasz Majewski Maciej W. Rozycki Mao Han Marc Aurèle La France Marius Hillenbrand Mark Wielaard Martin Liska Martin Sebor Matheus Castanho Matt Turner Maximilian Krüger Michael Colavita Ondřej Hošek Patrick McGehearty Patsy Griffin Paul E. Murphy Paul Eggert Paul Zimmermann Prasanth R Raoni Fassina Firmino Raphael M Zinsly Raphael Moreira Zinsly Richard Braun Richard Earnshaw Rolf Eike Beer Sajan Karumanchi Samuel Thibault Sergei Trofimovich Shuo Wang Siddhesh Poyarekar Stafford Horne Stefan Liebler Szabolcs Nagy Thorsten Kukuk Tulio Magno Quites Machado Filho Vincent Chen Vincent Mihalkovic Vineet Gupta W. Hashimoto Wilco Dijkstra Xiaoming Ni Zong Li liqingqing Érico Rolim
  • glibc-2.32.9000   Open master branch for glibc 2.33 development.
  • glibc-2.32   The GNU C Library ================= The GNU C Library version 2.32 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.32 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.32 ===================== Major new features: * Unicode 13.0.0 Support: Character encoding, character type info, and transliteration tables are all updated to Unicode 13.0.0, using generator scripts contributed by Mike FABIAN (Red Hat). * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq) * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1. Three ABIs are supported: - arc-linux-gnu - arc-linux-gnuhf - arceb-linux-gnu The arc* ABI is little-endian while arceb is big-endian. All ABIs use 64-bit time (y2038 safe) and 64-bit file offsets (LFS default). * The GNU C Library now loads audit modules listed in the DT_AUDIT and DT_DEPAUDIT dynamic section entries of the main executable. * powerpc64le supports IEEE128 long double libm/libc redirects when using the -mabi=ieeelongdouble to compile C code on supported GCC toolchains. It is recommended to use GCC 8 or newer when testing this option. * To help detect buffer overflows and other out-of-bounds accesses several APIs have been annotated with GCC 'access' attribute. This should help GCC 10 issue better warnings. * On Linux, functions the pthread_attr_setsigmask_np and pthread_attr_getsigmask_np have been added. They allow applications to specify the signal mask of a thread created with pthread_create. * The GNU C Library now provides the header file <sys/single_threaded.h> which declares the variable __libc_single_threaded. Applications are encouraged to use this variable for single-thread optimizations, instead of weak references to symbols historically defined in libpthread. * The functions sigabbrev_np and sigdescr_np have been added. The sigabbrev_np returns the abbreviated signal name (e.g. "HUP" for SIGHUP) while sigdescr_np returns a string describing the signal number (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not attempt to translate the return description, both functions return NULL for an invalid signal number. They should be used instead of sys_siglist or sys_sigabbrev and they are both thread and async-signal safe. These functions are GNU extensions. * The functions strerrorname_np and strerrordesc_np have been added. The strerroname_np returns error number name (e.g. "EINVAL" for EINVAL) while strerrordesc_np returns string describing error number (e.g "Invalid argument" for EINVAL). Different than strerror, strerrordesc_np does not attempt to translate the return description, both functions return NULL for an invalid error number. They should be used instead of sys_errlist and sys_nerr, both are thread and async-signal safe. These functions are GNU extensions. * AArch64 now supports standard branch protection security hardening in glibc when it is built with a GCC that is configured with --enable-standard-branch-protection (or if -mbranch-protection=standard flag is passed when building both GCC target libraries and glibc, in either case a custom GCC is needed). This includes branch target identification (BTI) and pointer authentication for return addresses (PAC-RET). They require armv8.5-a and armv8.3-a architecture extensions respectively for the protection to be effective, otherwise the used instructions are nops. User code can use PAC-RET without libc support, but BTI requires a libc that is built with BTI support, otherwise runtime objects linked into user code will not be BTI compatible. Deprecated and removed features, and other changes affecting compatibility: * Remove configure option --enable-obsolete-rpc. Sun RPC is removed from glibc. This includes the rpcgen program, librpcsvc, and the Sun RPC header files. Backward compatibility for old programs is kept only for architectures and ABIs that have been added in or before glibc 2.31. New programs need to use TI-RPC <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>. * Remove configure option --enable-obsolete-nsl. libnsl is only built as shared library for backward compatibility and the NSS modules "nis" and "nisplus" are not built at all and libnsl's headers aren't installed. This compatibility is kept only for architectures and ABIs that have been added in or before version 2.28. Replacement implementations based on TI-RPC, which additionally support IPv6, are available from <https://github.com/thkukuk/>. This change does not affect the "compat" NSS module, which does not depended on libnsl since 2.27 and thus can be used without NIS. * The deprecated <sys/sysctl.h> header and the sysctl function have been removed. To support old binaries, the sysctl function continues to exist as a compatibility symbol (on those architectures which had it), but always fails with ENOSYS. This reflects the removal of the system call from all architectures, starting with Linux 5.5. * The sstk function is no longer available to newly linked binaries. Its implementation always returned with a failure, and the function was not declared in any header file. * The legacy signal handling functions siginterrupt, sigpause, sighold, sigrelse, sigignore and sigset, and the sigmask macro have been deprecated. Applications should use the sigsuspend, sigprocmask and sigaction functions instead. * ldconfig now defaults to the new format for ld.so.cache. glibc has already supported this format for almost 20 years. * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev are no longer available to newly linked binaries, and their declarations have been removed from <string.h>. They are exported solely as compatibility symbols to support old binaries. All programs should use strsignal instead. * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr are no longer available to newly linked binaries, and their declarations have been removed from from <stdio.h>. They are exported solely as compatibility symbols to support old binaries. All programs should use strerror or strerror_r instead. * Both strerror and strerror_l now share the same internal buffer in the calling thread, meaning that the returned string pointer may be invalided or contents might be overwritten on subsequent calls in the same thread or if the thread is terminated. It makes strerror MT-safe. * Using weak references to libpthread functions such as pthread_create or pthread_key_create to detect the singled-threaded nature of a program is an obsolescent feature. Future versions of glibc will define pthread_create within libc.so.6 itself, so such checks will always flag the program as multi-threaded. Applications should check the __libc_single_threaded variable declared in <sys/single_threaded.h> instead. * The "files" NSS module no longer supports the "key" database (used for secure RPC). The contents of the /etc/publickey file will be ignored, regardless of the settings in /etc/nsswitch.conf. (This method of storing RPC keys only supported the obsolete and insecure AUTH_DES flavor of secure RPC.) * The __morecore and __after_morecore_hook malloc hooks and the default implementation __default_morecore have been deprecated. Applications should use malloc interposition to change malloc behavior, and mmap to allocate anonymous memory. A future version of glibc may require that applications which use the malloc hooks must preload a special shared object, to enable the hooks. * The hesiod NSS module has been deprecated and will be removed in a future version of glibc. System administrators are encouraged to switch to other approaches for networked account databases, such as LDAP. Changes to build and runtime requirements: * powerpc64le requires GCC 7.4 or newer. This is required for supporting long double redirects. Security related changes: CVE-2016-10228: An infinite loop has been fixed in the iconv program when invoked with the -c option and when processing invalid multi-byte input sequences. Reported by Jan Engelhardt. CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack corruption when they were passed a pseudo-zero argument. Reported by Guido Vranken / ForAllSecure Mayhem. CVE-2020-1752: A use-after-free vulnerability in the glob function when expanding ~user has been fixed. CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and memmove functions has been fixed. Discovered by Jason Royes and Samual Dytrych of the Cisco Security Assessment and Penetration Team (See TALOS-2020-1019). The following bugs are resolved with this release: [9809] localedata: ckb_IQ: new Kurdish Sorani locale [10441] manual: Backtraces code example lacks error checking [10815] librt: [timer_create / SIGEV_THREAD] signalmask of timer_sigev_thread dangerous [14231] stdio: stdio-common tests memory requirements [14578] libc: /proc-based emulation for lchmod, fchmodat [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if filtee has constructor [19519] locale: iconv(1) with -c option hangs on illegal multi-byte sequences (CVE-2016-10228) [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML character entities for infinity & pi [20338] libc: Parsing of /etc/gshadow can return bad pointers causing segfaults in applications [20543] libc: Please move from .gnu.linkonce to comdat [22489] network: gcc warns about implicit convertion in ICMP6_FILTER_SETPASS with -Wsign-conversion [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1" [23294] math: Complex _FloatN functions are redirected to the wrong function with -mlong-double-64 [23296] libc: Data race in setting function descriptor during lazy binding [23668] dynamic-link: ldconfig: Default to the new format for ld.so.cache [23819] hurd: hurd: Add C11 thread support [23990] build: test-container error out on failure to exec child. [23991] build: shell-container typo in run_command_array [24638] manual: Error in example of parsing a template string [24654] manual: Wrong declaration of wcschr in libc manual [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic linker [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for dynamically loaded dsos [25098] nptl: nptl: ctype classification functions are not AS-Safe [25219] libc: improve out-of-bounds checking with GCC 10 attribute access [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and restore EAX, ECX and EDX [25397] dynamic-link: Legacy bitmap doesn't cover jitted code [25414] glob: 'glob' use-after-free bug (CVE-2020-1752) [25420] network: Race condition in resolv_conf.c can result in caching stale configuration forever [25487] math: sinl() stack corruption from crafted input (CVE-2020-10029) [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC defaults to PIE [25523] libc: MIPS/Linux inline syscall template is miscompiled [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy() (CVE-2020-6096) [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31 on 32 bit and old kernel [25635] libc: arm: Wrong sysdep order selection for soft-fp [25639] localedata: Some names of days and months wrongly spelt in Occitan [25657] libc: sigprocmask() and sigisemptyset() manipulate different amount of sigset_t bytes [25691] stdio: printf: memory leak when printing long multibyte strings [25715] libc: system() returns wrong errors when posix_spawn fails [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion state for conversions that produce two Unicode code points [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel for linux x86_64 leads to livelock [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes test failures, invalid instruction in ld.so [25790] glob: Typo in tst-fnmatch.input [25810] libc: x32: Incorrect syscall entries with pointer, off_t and size_t [25819] localedata: Update locale data to Unicode 13.0.0 [25824] libc: Abnormal function of strnlen in aarch64 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1] [25896] libc: Incorrect prctl [25902] libc: Bad LOADARGS_N [25905] dynamic-link: VSX registers are corrupted during PLT resolution when glibc is built with --disable-multi-arch and --with- cpu=power9 [25933] string: Off by one error in __strncmp_avx2 when length=VEC_SIZE*4 and strings are at page boundaries can cause a segfault [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and exiting detached thread [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold for x32 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding ERANGE [25999] nptl: Use-after-free issue in pthread_getaddr_default_np [26073] math: getpayload() has wrong return value [26076] dynamic-link: dlmopen crashes after failing to load dependencies in audit mode [26120] localedata: column width of of some Korean JUNGSEONG/JONGSEONG characters wrong (should be 0) [26128] libc: Incorrect bit_cpu_CLFLUSHOPT [26133] libc: Incorrect need_arch_feature_F16C [26137] libc: strtod() triggers exception FE_INEXACT on reasonable input [26149] libc: PKU is usable only if OSPKE is set [26173] libc: powerpc64*: Add @notoc to calls to functions that do not preserve r2 [26208] libc: Incorrect bit_cpu_CLFSH [26210] network: Incorrect use of hidden symbols for global sunrpc variables [26211] stdio: printf integer overflow calculating allocation size [26214] stdio: printf_fp double free [26215] stdio: printf_fp memory leak [26232] time: FAIL: support/tst-timespec for 32-bit targets [26258] nss: nss_compat should not read input files with mmap [26332] string: Incorrect cache line size load causes memory corruption in memset Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.32 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Alan Modra Alex Butler Alexander Anisimov Alistair Francis Andrea Corallo Andreas K. Hüttel Andreas Schwab Anton Blanchard Anton Blanchard via Libc-alpha Arjun Shankar Aurelien Jarno Aurélien Aptel Carlos O'Donell Chung-Lin Tang DJ Delorie David Kilroy Evgeny Eremin Eyal Itkin Fangrui Song Florian Weimer Gabriel F. T. Gomes Girish Joshi H.J. Lu John David Anglin John Marshall Jonathan Wakely Joseph Myers Josh Triplett Jwtiyar Nariman Krzysztof Koch Lexi Shao Lucas A. M. Magalhaes Lukasz Majewski Maciej W. Rozycki Martin Sebor Matheus Castanho Mathieu Desnoyers Michael Hudson-Doyle Mike FABIAN Patsy Franklin Paul E. Murphy Paul Eggert Paul Zimmermann Petr Vorel Rafał Lużyński Rajalakshmi Srinivasaraghavan Raphael Moreira Zinsly Rogerio Alves Samuel Thibault Sergey Shen-Ta Hsieh Siddhesh Poyarekar Simon Marchi Stefan Liebler Sudakshina Das Sunil K Pandey Szabolcs Nagy Tulio Magno Quites Machado Filho Vineet Gupta WANG Xuerui Wilco Dijkstra guojinhui kokoye2007 mayshao mayshao-oc
  • glibc-2.31.9000   Open master branch for 2.32 development
  • glibc-2.31   The GNU C Library ================= The GNU C Library version 2.31 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.31 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.31 ===================== Major new features: * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to enable features from the draft ISO C2X standard. Only some features from this draft standard are supported by the GNU C Library, and as the draft is under active development, the set of features enabled by this macro is liable to change. Features from C2X are also enabled by _GNU_SOURCE, or by compiling with "gcc -std=gnu2x". * The <math.h> functions that round their results to a narrower type now have corresponding type-generic macros in <tgmath.h>, as defined in TS 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of Clarification Request 13 to TS 18661-3. * The function pthread_clockjoin_np has been added, enabling join with a terminated thread with a specific clock. It allows waiting against CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension. * New locale added: mnw_MM (Mon language spoken in Myanmar). * The DNS stub resolver will optionally send the AD (authenticated data) bit in queries if the trust-ad option is set via the options directive in /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this mode, the AD bit, as provided by the name server, is available to applications which call res_search and related functions. In the default mode, the AD bit is not set in queries, and it is automatically cleared in responses, indicating a lack of DNSSEC validation. (Therefore, the name servers and the network path to them are treated as untrusted.) Deprecated and removed features, and other changes affecting compatibility: * The totalorder and totalordermag functions, and the corresponding functions for other floating-point types, now take pointer arguments to avoid signaling NaNs possibly being converted to quiet NaNs in argument passing. This is in accordance with the resolution of Clarification Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass floating-point arguments directly will continue to work. * The obsolete function stime is no longer available to newly linked binaries, and its declaration has been removed from <time.h>. Programs that set the system time should use clock_settime instead. * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>, in a future version of glibc. In this release, the header still exists but calling ftime will cause a compiler warning. All programs should use gettimeofday or clock_gettime instead. * The gettimeofday function no longer reports information about a system-wide time zone. This 4.2-BSD-era feature has been deprecated for many years, as it cannot handle the full complexity of the world's timezones, but hitherto we have supported it on a best-effort basis. Changes required to support 64-bit time_t on 32-bit architectures have made this no longer practical. As of this release, callers of gettimeofday with a non-null 'tzp' argument should expect to receive a 'struct timezone' whose tz_minuteswest and tz_dsttime fields are zero. (For efficiency reasons, this does not always happen on a few Linux-based ports. This will be corrected in a future release.) All callers should supply a null pointer for the 'tzp' argument to gettimeofday. For accurate information about the time zone associated with the current time, use the localtime function. gettimeofday itself is obsolescent according to POSIX. We have no plans to remove access to this function, but portable programs should consider using clock_gettime instead. * The settimeofday function can still be used to set a system-wide time zone when the operating system supports it. This is because the Linux kernel reused the API, on some architectures, to describe a system-wide time-zone-like offset between the software clock maintained by the kernel, and the "RTC" clock that keeps time when the system is shut down. However, to reduce the odds of this offset being set by accident, settimeofday can no longer be used to set the time and the offset simultaneously. If both of its two arguments are non-null, the call will fail (setting errno to EINVAL). Callers attempting to set this offset should also be prepared for the call to fail and set errno to ENOSYS; this already happens on the Hurd and on some Linux architectures. The Linux kernel maintainers are discussing a more principled replacement for the reused API. After a replacement becomes available, we will change settimeofday to fail with ENOSYS on all platforms when its 'tzp' argument is not a null pointer. settimeofday itself is obsolescent according to POSIX. Programs that set the system time should use clock_settime and/or the adjtime family of functions instead. We may cease to make settimeofday available to newly linked binaries after there is a replacement for Linux's time-zone-like offset API. * SPARC ISA v7 is no longer supported. v8 is still supported, but only if the optional CAS instruction is implemented (for instance, LEON processors are still supported, but SuperSPARC processors are not). As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit configurations. * If a lazy binding failure happens during dlopen, during the execution of an ELF constructor, the process is now terminated. Previously, the dynamic loader would return NULL from dlopen, with the lazy binding error captured in a dlerror message. In general, this is unsafe because resetting the stack in an arbitrary function call is not possible. * For MIPS hard-float ABIs, the GNU C Library will be configured to need an executable stack unless explicitly configured at build time to require minimum kernel version 4.8 or newer. This is because executing floating-point branches on a non-executable stack on Linux kernels prior to 4.8 can lead to application crashes for some MIPS configurations. While currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are expected to enable non-executable stack by default with PT_GNU_STACK by default and is thus likely to trigger a crash on older kernels. The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a non-executable stack while dropping support for older kernels. * System call wrappers for time system calls now use the new time64 system calls when available. On 32-bit targets, these wrappers attempt to call the new system calls first and fall back to the older 32-bit time system calls if they are not present. This may cause issues in environments that cannot handle unsupported system calls gracefully by returning -ENOSYS. Seccomp sandboxes are affected by this issue. Changes to build and runtime requirements: * It is no longer necessary to have recent Linux kernel headers to build working (non-stub) system call wrappers on all architectures except 64-bit RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0. * The ChangeLog file is no longer present in the toplevel directory of the source tree. ChangeLog files are located in the ChangeLog.old directory as ChangeLog.N where the highest N has the latest entries. Security related changes: CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program. Reported by Marcin Kościelnicki. The following bugs are resolved with this release: [12031] localedata: iconv -t ascii//translit with Greek characters [15813] libc: Multiple issues in __gen_tempname [17726] libc: [arm, sparc] profil_counter should be compat symbol [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h [19767] libc: vdso is not used with static linking [19903] hurd: Shared mappings not being inherited by children processes [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD [20839] dynamic-link: Incomplete rollback of dynamic linker state on linking failure [23132] localedata: Missing transliterations in Miscellaneous Mathematical Symbols-A/B Unicode blocks [23518] libc: Eliminate __libc_utmp_jump_table [24026] malloc: malloc_info() returns wrong numbers [24054] localedata: Many locales are missing date_fmt [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode [24304] dynamic-link: Lazy binding failure during ELF constructors/destructors is not fatal [24376] libc: RISC-V symbol size confusion with _start [24682] localedata: zh_CN first weekday should be Monday per GB/T 7408-2005 [24824] libc: test-in-container does not install charmap files compatible with localedef [24844] regex: regex bad pointer / leakage if malloc fails [24867] malloc: Unintended malloc_info formatting changes [24879] libc: login: utmp alarm timer can arrive after lock acquisition [24880] libc: login: utmp implementation uses struct flock with fcntl64 [24882] libc: login: pututline uses potentially outdated cache [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h> [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale utmp entries [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to ABSOLUTE ABI [24930] dynamic-link: dlopen of PIE executable can result in _dl_allocate_tls_init assertion failure [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC (stringop-overflow error) [24959] time: librt IFUNC resolvers for clock_gettime and clock_* functions other can lead to crashes [24967] libc: jemalloc static linking causes runtime failure [24986] libc: alpha: new getegid, geteuid and getppid syscalls used unconditionally [25035] libc: sbrk() failure handled poorly in tunables_strdup [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement [25097] libc: new -Warray-bounds with GCC 10 [25112] dynamic-link: dlopen must not make new objects accessible when it still can fail with an error [25139] localedata: Please add the new mnw_MM locale [25149] regex: Array bounds violation in proceed_next_node [25157] dynamic-link: Audit cookie for the dynamic loader is not initialized correctly [25189] libc: glibc's __glibc_has_include causes issues with clang -frewrite-includes [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt value to an unsigned [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries (CVE-2019-19126) [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf- protection [25226] string: strstr: Invalid result if needle crosses page on s390-z15 ifunc variant. [25232] string: <string.h> does not enable const correctness for strchr et al. for Clang++ [25233] localedata: Consider "." as the thousands separator for sl_SI (Slovenian) [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG. [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling with -std=c11 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M" [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time part [25396] dynamic-link: Failing dlopen can leave behind dangling GL (dl_initfirst) link map pointer [25401] malloc: pvalloc must not have __attribute_alloc_size__ [25423] libc: Array overflow in backtrace on powerpc [25425] network: Missing call to __resolv_context_put in getaddrinfo.c:gethosts Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.31 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Alexandra Hájková Alistair Francis Andreas Schwab Andrew Eggenberger Arjun Shankar Aurelien Jarno Carlos O'Donell Chung-Lin Tang DJ Delorie Dmitry V. Levin Dragan Mladjenovic Egor Kobylkin Emilio Cobos Álvarez Emilio Pozuelo Monfort Feng Xue Florian Weimer Gabriel F. T. Gomes Gustavo Romero H.J. Lu Ian Kent James Clarke Jeremie Koenig John David Anglin Joseph Myers Kamlesh Kumar Krzysztof Koch Leandro Pereira Lucas A. M. Magalhaes Lukasz Majewski Marcin Kościelnicki Matheus Castanho Mihailo Stojanovic Mike Crowe Mike FABIAN Niklas Hambüchen Paul A. Clarke Paul Eggert Petr Vorel Rafal Luzynski Rafał Lużyński Rajalakshmi Srinivasaraghavan Raoni Fassina Firmino Richard Braun Samuel Thibault Sandra Loosemore Siddhesh Poyarekar Stefan Liebler Svante Signell Szabolcs Nagy Talachan Mon Thomas Schwinge Tim Rühsen Tulio Magno Quites Machado Filho Wilco Dijkstra Xuelei Zhang Zack Weinberg liqingqing
  • changelog-ends-here
  • glibc-2.30.9000   Open master branch for glibc 2.30 development.
  • glibc-2.30   The GNU C Library ================= The GNU C Library version 2.30 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.30 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.30 ===================== Major new features: * Unicode 12.1.0 Support: Character encoding, character type info, and transliteration tables are all updated to Unicode 12.1.0, using generator scripts contributed by Mike FABIAN (Red Hat). * The dynamic linker accepts the --preload argument to preload shared objects, in addition to the LD_PRELOAD environment variable. * The twalk_r function has been added. It is similar to the existing twalk function, but it passes an additional caller-supplied argument to the callback function. * On Linux, the getdents64, gettid, and tgkill functions have been added. * Minguo (Republic of China) calendar support has been added as an alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW, nan_TW, lzh_TW. * The entry for the new Japanese era has been added for ja_JP locale. * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc, pvalloc, memalign, and posix_memalign fail now with total object size larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with pointer subtraction within the allocated object, where results might overflow the ptrdiff_t type. * The dynamic linker no longer refuses to load objects which reference versioned symbols whose implementation has moved to a different soname since the object has been linked. The old error message, symbol FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with link time reference, is gone. * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock, pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait functions. These behave similarly to their "timed" equivalents, but also accept a clockid_t parameter to determine which clock their timeout should be measured against. All functions allow waiting against CLOCK_MONOTONIC and CLOCK_REALTIME. The decision of which clock to be used is made at the time of the wait (unlike with pthread_condattr_setclock, which requires the clock choice at initialization time). * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still work, new resolvers can use a second argument which can be extended in the future, currently it contains the AT_HWCAP2 value. Deprecated and removed features, and other changes affecting compatibility: * The copy_file_range function fails with ENOSYS if the kernel does not support the system call of the same name. Previously, user space emulation was performed, but its behavior did not match the kernel behavior, which was deemed too confusing. Applications which use the copy_file_range function can no longer rely on glibc to provide a fallback on kernels that do not support the copy_file_range system call, and if this function returns ENOSYS, they will need to use their own fallback. Support for copy_file_range for most architectures was added in version 4.5 of the mainline Linux kernel. * The functions clock_gettime, clock_getres, clock_settime, clock_getcpuclockid, clock_nanosleep were removed from the librt library for new applications (on architectures which had them). Instead, the definitions in libc will be used automatically, which have been available since glibc 2.17. * The obsolete and never-implemented XSI STREAMS header files <stropts.h> and <sys/stropts.h> have been removed. * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6 resolver flag (deprecated in glibc 2.25) have been removed. * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub resolver have been removed from <resolv.h>. * With --enable-bind-now, installed programs are now linked with the BIND_NOW flag. * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe* configurations) has been removed, following the deprecation of this subarchitecture in version 8 of GCC, and its removal in version 9. * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h> header have been removed. * The Linux-specific <sys/sysctl.h> header and the sysctl function have been deprecated and will be removed from a future version of glibc. Application should directly access /proc instead. For obtaining random bits, the getentropy function can be used. Changes to build and runtime requirements: * GCC 6.2 or later is required to build the GNU C Library. Older GCC versions and non-GNU compilers are still supported when compiling programs that use the GNU C Library. Security related changes: CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check size. For x86-64, memcmp on an object size larger than SSIZE_MAX has undefined behavior. On x32, the size_t argument may be passed in the lower 32 bits of the 64-bit RDX register with non-zero upper 32 bits. When it happened with the sign bit of RDX register set, memcmp gave the wrong result since it treated the size argument as zero. Reported by H.J. Lu. CVE-2019-9169: Attempted case-insensitive regular-expression match via proceed_next_node in posix/regexec.c leads to heap-based buffer over-read. Reported by Hongxu Chen. The following bugs are resolved with this release: [2872] locale: Transliteration Cyrillic -> ASCII fails [6399] libc: gettid() should have a wrapper [16573] malloc: mtrace hangs when MALLOC_TRACE is defined [16976] glob: fnmatch unbounded stack VLA for collating symbols [17396] localedata: globbing for locale by [[.collating-element.]] [18035] dynamic-link: pldd does no longer work, enters infinite loop [18465] malloc: memusagestat is built using system C library [18830] locale: iconv -c -f ascii with >buffer size worth of input before invalid input drops valid char [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8 [21897] localedata: Afar locales: Fix mon, abmon, and abday [22964] localedata: The Japanese Era name will be changed on May 1, 2019 [23352] malloc: __malloc_check_init still defined in public header malloc.h. [23403] nptl: Wrong alignment of TLS variables [23501] libc: nftw() doesn't return dangling symlink's inode [23733] malloc: Check the count before calling tcache_get() [23741] malloc: Missing __attribute_alloc_size__ in many allocation functions [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep [23844] nptl: pthread_rwlock_trywrlock results in hang [23983] argparse: Missing compat versions of argp_failure and argp_error for long double = double [23984] libc: Missing compat versions of err.h and error.h functions for long double = double [23996] localedata: Dutch salutations [24040] libc: riscv64: unterminated call chain in __thread_start [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid long timeouts [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout [24059] nss: nss_files: get_next_alias calls fgets_unlocked without checking for NULL. [24114] regex: regexec buffer read overrun in "grep -i '\(\(\)*.\)*\(\)\(\)\1'" [24122] libc: Segfaults if 0 returned from la_version [24153] stdio: Some input functions do not react to stdin assignment [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in RDX is set) (CVE-2019-7309) [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm, not the default "nor" [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN false positives, change to modern flexible array [24180] nptl: pthread_mutex_trylock does not use the correct order of instructions while maintaining the robust mutex list due to missing compiler barriers. [24194] librt: Non-compatibility symbols for clock_gettime etc. cause unnecessary librt dependencies [24200] localedata: Revert first_weekday removal in en_IE locale [24211] nptl: Use-after-free in Systemtap probe in pthread_join [24215] nptl: pthread_timedjoin_np should be a cancellation point [24216] malloc: Check for large bin list corruption when inserting unsorted chunk [24228] stdio: old x86 applications that use legacy libio crash on exit [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through to R_SPARC_H44 [24293] localedata: Missing Minguo calendar support for TW locales [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in tt_RU (Tatar) locale [24307] localedata: Update locale data to Unicode 12.0.0 [24323] dynamic-link: dlopen should not be able open PIE objects [24335] build: "Obsolete types detected" with Linux 5.0 headers [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in tt_RU (Tatar) locale [24370] localedata: Add lang_name for tt_RU locale [24372] locale: Binary locale files are not architecture independent [24394] time: strptime %Ey mis-parses final year of era [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror was not used [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in- tests [24531] malloc: Malloc tunables give tcache assertion failures [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit time_t changes [24535] localedata: Update locale data to Unicode 12.1.0 [24537] build: nptl/tst-eintr1 test case can hit task limits on some kernels and break testing [24544] build: elf/tst-pldd doesn't work if you install with a --prefix [24556] build: [GCC 9] error: ‘%s’ directive argument is null [-Werror=format-overflow=] [24570] libc: alpha: compat msgctl uses __IPC_64 [24584] locale: Data race in __wcsmbs_clone_conv [24588] stdio: Remove codecvt vtables from libio [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with -O3 -march=skylake [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35 [24632] stdio: Old binaries which use freopen with default stdio handles crash [24640] libc: __ppc_get_timebase_freq() always return 0 when using static linked glibc [24652] localedata: szl_PL spelling correction [24695] nss: nss_db: calling getpwent after endpwent crashes [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry in /etc/nsswitch.conf [24699] libc: mmap64 with very large offset broken on MIPS64 n32 [24740] libc: getdents64 type confusion [24741] dynamic-link: ld.so should not require that a versioned symbol is always implemented in the same library [24744] libc: Remove copy_file_range emulation [24757] malloc: memusagestat is linked against system libpthread [24794] libc: Partial test suite run builds corrupt test-in-container testroot Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.30 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adam Maris Adhemerval Zanella Alexandra Hájková Andreas K. Hüttel Andreas Schwab Anton Youdkevitch Aurelien Jarno Carlos O'Donell DJ Delorie Daniil Zhilin David Abdurachmanov David Newall Dmitry V. Levin Egor Kobylkin Felix Yan Feng Xue Florian Weimer Gabriel F. T. Gomes Grzegorz Kulik H.J. Lu Jan Kratochvil Jim Wilson Joseph Myers Maciej W. Rozycki Mao Han Mark Wielaard Matthew Malcomson Mike Crowe Mike FABIAN Mike Frysinger Mike Gerow PanderMusubi Patsy Franklin Paul A. Clarke Paul Clarke Paul Eggert Paul Pluzhnikov Rafal Luzynski Richard Henderson Samuel Thibault Siddhesh Poyarekar Stan Shebs Stefan Liebler Szabolcs Nagy TAMUKI Shoichi Tobias Klauser Tulio Magno Quites Machado Filho Uros Bizjak Vincent Chen Vineet Gupta Wilco Dijkstra Wolfram Sang Yann Droneaud Zack Weinberg mansayk marxin
    0a8262a1 · Tag 2.30 release. ·
  • glibc-2.29.9000   Open master branch for glibc 2.30 development
  • glibc-2.29   The GNU C Library ================= The GNU C Library version 2.29 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2008. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.29 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.29 ==================== * The getcpu wrapper function has been added, which returns the currently used CPU and NUMA node. This function is Linux-specific. * A new convenience target has been added for distribution maintainers to build and install all locales as directories with files. The new target is run by issuing the following command in your build tree: 'make localedata/install-locale-files', with an optional DESTDIR to set the install root if you wish to install into a non-default configured location. * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf. * The reallocarray function is now declared under _DEFAULT_SOURCE, not just for _GNU_SOURCE, to match BSD environments. * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel indicates that it will abort the transaction prior to entering the kernel (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is suspended, and this caused some undefined side-effects issues by aborting transactions manually. Glibc avoided it by abort transactions manually on each syscall, but it lead to performance issues on newer kernels where the HTM state is saved and restore lazily (the state being saved even when the process actually does not use HTM). * The functions posix_spawn_file_actions_addchdir_np and posix_spawn_file_actions_addfchdir_np have been added, enabling posix_spawn and posix_spawnp to run the new process in a different directory. These functions are GNU extensions. The function posix_spawn_file_actions_addchdir_np is similar to the Solaris function of the same name. * The popen and system do not run atfork handlers anymore (BZ#17490). Although it is a possible POSIX violation, the POSIX rationale in pthread_atfork documentation regarding atfork handlers is to handle inconsistent mutex state after a fork call in a multi-threaded process. In both popen and system there is no direct access to user-defined mutexes. * Support for the C-SKY ABIV2 running on Linux has been added. This port requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are supported: - C-SKY ABIV2 soft-float little-endian - C-SKY ABIV2 hard-float little-endian * strftime's default formatting of a locale's alternative year (%Ey) has been changed to zero-pad the year to a minimum of two digits, like "%y". This improves the display of Japanese era years during the first nine years of a new era, and is expected to be harmless for all other locales (only Japanese locales regularly have alternative year numbers less than 10). Zero-padding can be overridden with the '_' or '-' flags (which are GNU extensions). * As a GNU extension, the '_' and '-' flags can now be applied to "%EY" to control how the year number is formatted; they have the same effect that they would on "%Ey". Deprecated and removed features, and other changes affecting compatibility: * The glibc.tune tunable namespace has been renamed to glibc.cpu and the tunable glibc.tune.cpu has been renamed to glibc.cpu.name. * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined in <sys/procfs.h>, has been corrected to match the type actually used by the Linux kernel. This affects the size and layout of that structure on MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V. * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo, defined in <sys/procfs.h>, has been corrected to match the type actually used by the Linux kernel. This affects the size and layout of those structures. * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]' meant to scan a string and allocate space for it with malloc, is now restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE defined. This extension conflicts with C99's use of '%a' to scan a hexadecimal floating-point number, which is now available to programs compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE. POSIX.1-2008 includes the feature of allocating a buffer for string input with malloc, using the modifier letter 'm' instead. Programs using '%as', '%aS', or '%a[...]' with the old GNU meaning should change to '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the C99 '%a' no longer need to avoid _GNU_SOURCE. GCC's -Wformat warnings can detect most uses of this extension, as long as all functions that call vscanf, vfscanf, or vsscanf are annotated with __attribute__ ((format (scanf, ...))). Changes to build and runtime requirements: * Python 3.4 or later is required to build the GNU C Library. * On most architectures, GCC 5 or later is required to build the GNU C Library. (On powerpc64le, GCC 6.2 or later is still required, as before.) Older GCC versions and non-GNU compilers are still supported when compiling programs that use the GNU C Library. Security related changes: CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a denial of service due to resource exhaustion when processing getaddrinfo calls with crafted host names. Reported by Guido Vranken. CVE-2019-6488: On x32, the size_t parameter may be passed in the lower 32 bits of a 64-bit register with with non-zero upper 32 bit. When it happened, accessing the 32-bit size_t value as the full 64-bit register in the assembly string/memory functions would cause a buffer overflow. Reported by H.J. Lu. CVE-2016-10739: The getaddrinfo function could successfully parse IPv4 addresses with arbitrary trailing characters, potentially leading to data or command injection issues in applications. Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.29 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Albert ARIBAUD (3ADEV) Alexandra Hájková Andreas K. Hüttel Andreas Schwab Anton Youdkevitch Arjun Shankar Assaf Gordon Aurelien Jarno Carlos O'Donell Charles-Antoine Couret DJ Delorie Darius Rad David S. Miller Dmitry V. Levin Florian Weimer Fredrik Noring Gabriel F. T. Gomes H.J. Lu Ilya Leoshkevich Ilya Yu. Malakhov Istvan Kurucsai Jim Wilson Joseph Myers Justus Winter Kemi Wang Leonardo Sandoval Mao Han Martin Jansa Martin Kuchta Martin Sebor Mingli Yu Moritz Eckert PanderMusubi Paul Clarke Paul Eggert Paul Pluzhnikov Pochang Chen Rafael Avila de Espindola Rafael Ávila de Espíndola Rafal Luzynski Rajalakshmi Srinivasaraghavan Rogerio Alves Samuel Thibault Sergi Almacellas Abellana Siddhesh Poyarekar Stefan Liebler Steve Ellcey Szabolcs Nagy TAMUKI Shoichi Tobias Klauser Tulio Magno Quites Machado Filho Uroš Bizjak Wilco Dijkstra Zack Weinberg Zong Li
    56c86f5d · Tag 2.29 release ·
  • glibc-2.28.9000   Open master branch for glibc 2.29 development
  • glibc-2.28   The GNU C Library ================= The GNU C Library version 2.28 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2008. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.28 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.28 ===================== Major new features: * The localization data for ISO 14651 is updated to match the 2016 Edition 4 release of the standard, this matches data provided by Unicode 9.0.0. This update introduces significant improvements to the collation of Unicode characters. This release deviates slightly from the standard in that the collation element ordering for lowercase and uppercase LATIN script characters is adjusted to ensure that regular expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A is not matched by [a-z]. With the update many locales have been updated to take advantage of the new collation information. The new collation information has increased the size of the compiled locale archive or binary locales. * The GNU C Library can now be compiled with support for Intel CET, AKA Intel Control-flow Enforcement Technology. When the library is built with --enable-cet, the resulting glibc is protected with indirect branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is compatible with all existing executables and shared libraries. This feature is currently supported on i386, x86_64 and x32 with GCC 8 and binutils 2.29 or later. Note that CET-enabled glibc requires CPUs capable of multi-byte NOPs, like x86-64 processors as well as Intel Pentium Pro or newer. NOTE: --enable-cet has been tested for i686, x86_64 and x32 on non-CET processors. --enable-cet has been tested for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been validated for i686. * The GNU C Library now has correct support for ABSOLUTE symbols (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were relocated incorrectly or in some cases discarded. The GNU linker can make use of the newer semantics, but it must communicate it to the dynamic loader by setting the ELF file's identification (EI_ABIVERSION field) to indicate such support is required. * Unicode 11.0.0 Support: Character encoding, character type info, and transliteration tables are all updated to Unicode 11.0.0, using generator scripts contributed by Mike FABIAN (Red Hat). * <math.h> functions that round their results to a narrower type are added from TS 18661-1:2014 and TS 18661-3:2015: - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and fMxaddfNx functions. - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and fMxsubfNx functions. - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and fMxmulfNx functions. - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and fMxdivfNx functions. * Two grammatical forms of month names are now supported for the following languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian, Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now support two grammatical forms in abbreviated month names: Catalan, Greek, and Kashubian. * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also include the support for two grammatical forms of month names. * Building and running on GNU/Hurd systems now works without out-of-tree patches. * The renameat2 function has been added, a variant of the renameat function which has a flags argument. If the flags are zero, the renameat2 function acts like renameat. If the flag is not zero and there is no kernel support for renameat2, the function will fail with an errno value of EINVAL. This is different from the existing gnulib function renameatu, which performs a plain rename operation in case of a RENAME_NOREPLACE flags and a non-existing destination (and therefore has a race condition that can clobber the destination inadvertently). * The statx function has been added, a variant of the fstatat64 function with an additional flags argument. If there is no direct kernel support for statx, glibc provides basic stat support based on the fstatat64 function. * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2 library if installed. libidn2 version 2.0.5 or later is recommended. If libidn2 is not available, internationalized domain names are not encoded or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail with an encoding error.) Flags which used to change the IDN encoding and decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES, NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been deprecated. They no longer have any effect. * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED, DT_AUXILIARY, and DT_FILTER has been expanded to support the full range of ELF gABI expressions including such constructs as '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules have been further restricted, and where in the past a dynamic string token sequence may have been interpreted as a literal string it will now cause a load failure. These load failures were always considered unspecified behaviour from the perspective of the dynamic loader, and for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED results in a load failure now. * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The implementation includes all the standard functions provided by <threads.h>: - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create, thrd_detach, thrd_exit, and thrd_join for thread management. - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and mtx_destroy for mutual exclusion. - call_once for function call synchronization. - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and cnd_wait for conditional variables. - tss_create, tss_delete, tss_get, and tss_set for thread-local storage. Application developers must link against libpthread to use ISO C threads. Deprecated and removed features, and other changes affecting compatibility: * The nonstandard header files <libio.h> and <_G_config.h> are no longer installed. Software that was using either header should be updated to use standard <stdio.h> interfaces instead. * The stdio functions 'getc' and 'putc' are no longer defined as macros. This was never required by the C standard, and the macros just expanded to call alternative names for the same functions. If you hoped getc and putc would provide performance improvements over fgetc and fputc, instead investigate using (f)getc_unlocked and (f)putc_unlocked, and, if necessary, flockfile and funlockfile. * All stdio functions now treat end-of-file as a sticky condition. If you read from a file until EOF, and then the file is enlarged by another process, you must call clearerr or another function with the same effect (e.g. fseek, rewind) before you can read the additional data. This corrects a longstanding C99 conformance bug. It is most likely to affect programs that use stdio to read interactive input from a terminal. (Bug #1190.) * The macros 'major', 'minor', and 'makedev' are now only available from the header <sys/sysmacros.h>; not from <sys/types.h> or various other headers that happen to include <sys/types.h>. These macros are rarely used, not part of POSIX nor XSI, and their names frequently collide with user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for further explanation. <sys/sysmacros.h> is a GNU extension. Portable programs that require these macros should first include <sys/types.h>, and then include <sys/sysmacros.h> if __GNU_LIBRARY__ is defined. * The tilegx*-*-linux-gnu configurations are no longer supported. * The obsolete function ustat is no longer available to newly linked binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This function has been deprecated in favor of fstatfs and statfs. * The obsolete function nfsservctl is no longer available to newly linked binaries. This function was specific to systems using the Linux kernel and could not usefully be used with the GNU C Library on systems with version 3.1 or later of the Linux kernel. * The obsolete function name llseek is no longer available to newly linked binaries. This function was specific to systems using the Linux kernel and was not declared in a header. Programs should use the lseek64 name for this function instead. * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the getaddrinfo and getnameinfo functions have been deprecated. The behavior previously selected by them is now always enabled. * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for the getaddrinfo and getnameinfo functions have been deprecated. The STD3 restriction (rejecting '_' in host names, among other things) has been removed, for increased compatibility with non-IDN name resolution. * The fcntl function now have a Long File Support variant named fcntl64. It is added to fix some Linux Open File Description (OFD) locks usage on non LFS mode. As for others *64 functions, fcntl64 semantics are analogous with fcntl and LFS support is handled transparently. Also for Linux, the OFD locks act as a cancellation entrypoint. * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt, ecb_crypt, and des_setparity are no longer available to newly linked binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no longer installed. These functions encrypted and decrypted data with the DES block cipher, which is no longer considered secure. Software that still uses these functions should switch to a modern cryptography library, such as libgcrypt. * Reflecting the removal of the encrypt and setkey functions above, the macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is enabled. * The obsolete function fcrypt is no longer available to newly linked binaries. It was just another name for the standard function crypt, and it has not appeared in any header file in many years. * We have tentative plans to hand off maintenance of the passphrase-hashing library, libcrypt, to a separate development project that will, we hope, keep up better with new passphrase-hashing algorithms. We will continue to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or 'crypt_r' should not need to change at all; however, distributions will need to install <crypt.h> and libcrypt from a separate project. In this release, if the configure option --disable-crypt is used, glibc will not install <crypt.h> or libcrypt, making room for the separate project's versions of these files. The plan is to make this the default behavior in a future release. Changes to build and runtime requirements: GNU make 4.0 or later is now required to build glibc. Security related changes: CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have been fixed by removing the glibc-internal IDNA implementation and using the system-provided libidn2 library instead. Originally reported by Hanno Böck and Christian Weisgerber. CVE-2017-18269: An SSE2-based memmove implementation for the i386 architecture could corrupt memory. Reported by Max Horn. CVE-2018-11236: Very long pathname arguments to realpath function could result in an integer overflow and buffer overflow. Reported by Alexey Izbyshev. CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi architecture could write beyond the target buffer, resulting in a buffer overflow. Reported by Andreas Schwab. The following bugs are resolved with this release: [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant [6889] manual: 'PWD' mentioned but not specified [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t, when __WORDSIZE != 64 [13762] regex: re_search etc. should return -2 on memory exhaustion [13888] build: /tmp usage during testing [13932] math: dbl-64 pow unexpectedly slow for some inputs [14092] nptl: Support C11 threads [14095] localedata: Review / update collation data from Unicode / ISO 14651 [14508] libc: -Wformat warnings [14553] libc: Namespace pollution loff_t in sys/types.h [14890] libc: Make NT_PRFPREG canonical. [15105] libc: Extra PLT references with -Os [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign- conversion is given [16335] manual: Feature test macro documentation incomplete and out of date [16552] libc: Unify umount implementations in terms of umount2 [17082] libc: htons et al.: statement-expressions prevent use on global scope with -O1 and higher [17343] libc: Signed integer overflow in /stdlib/random_r.c [17438] localedata: pt_BR: wrong d_fmt delimiter [17662] libc: please implement binding for the new renameat2 syscall [17721] libc: __restrict defined as /* Ignore */ even in c11 [17979] libc: inconsistency between uchar.h and stdint.h [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536) [18023] libc: extend_alloca is broken (questionable pointer comparison, horrible machine code) [18124] libc: hppa: setcontext erroneously returns -1 as exit code for last constant. [18471] libc: llseek should be a compat symbol [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat symbols [18991] nss: nss_files skips large entry in database [19239] libc: Including stdlib.h ends up with macros major and minor being defined [19463] libc: linknamespace failures when compiled with -Os [19485] localedata: csb_PL: Update month translations + add yesstr/nostr [19527] locale: Normalized charset name not recognized by setlocale [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c' [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext- fpscr.c' [19728] network: out of bounds stack read in libidn function idna_to_ascii_4i (CVE-2016-6261) [19729] network: out of bounds heap read on invalid utf-8 inputs in stringprep_utf8_nfkc_normalize (CVE-2016-6263) [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by the base address [20079] libc: Add SHT_X86_64_UNWIND to elf.h [20251] libc: 32bit programs pass garbage in struct flock for OFD locks [20419] dynamic-link: files with large allocated notes crash in open_verify [20530] libc: bswap_16 should use __builtin_bswap16() when available [20890] dynamic-link: ldconfig: fsync the files before atomic rename [20980] manual: CFLAGS environment variable replaces vital options [21163] regex: Assertion failure in pop_fail_stack when executing a malformed regexp (CVE-2015-8985) [21234] manual: use of CFLAGS makes glibc detect no optimization [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong [21313] build: Compile Error GCC 5.4.0 MIPS with -0S [21314] build: Compile Error GCC 5.2.0 MIPS with -0s [21508] locale: intl/tst-gettext failure with latest msgfmt [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan) [21812] network: getifaddrs() returns entries with ifa_name == NULL [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static dlopen [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with AT_SECURE=1 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU) [22247] network: Integer overflow in the decode_digit function in puny_decode.c in libidn (CVE-2017-14062) [22342] nscd: NSCD not properly caching netgroup [22391] nptl: Signal function clear NPTL internal symbols inconsistently [22550] localedata: es_ES locale (and other es_* locales): collation should treat ñ as a primary different character, sync the collation for Spanish with CLDR [22638] dynamic-link: sparc: static binaries are broken if glibc is built by gcc configured with --enable-default-pie [22639] time: year 2039 bug for localtime etc. on 64-bit platforms [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when crossing 2GB threshold (CVE-2017-18269) [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and es_BO [22735] time: Misleading typo in time.h source comment regarding CLOCKS_PER_SECOND [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1 [22761] libc: No trailing `%n' conversion specifier in FMT passed from `__assert_perror_fail ()' to `__assert_fail_base ()' [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust dlopen failures [22786] libc: Stack buffer overflow in realpath() if input size is close to SSIZE_MAX (CVE-2018-11236) [22787] dynamic-link: _dl_check_caller returns false when libc is linked through an absolute DT_NEEDED path [22792] build: tcb-offsets.h dependency dropped [22797] libc: pkey_get() uses non-reserved name of argument [22807] libc: PTRACE_* constants missing for powerpc [22818] glob: posix/tst-glob_lstat_compat failure on alpha [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig [22830] malloc: malloc_stats doesn't restore cancellation state on stderr [22848] localedata: ca_ES: update date definitions from CLDR [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly [22896] localedata: Update locale data for an_ES [22902] math: float128 test failures with GCC 8 [22918] libc: multiple common of `__nss_shadow_database' [22919] libc: sparc32: backtrace yields infinite backtrace with makecontext [22926] libc: FTBFS on powerpcspe [22932] localedata: lt_LT: Update of abbreviated month names from CLDR required [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon [22947] libc: FAIL: misc/tst-preadvwritev2 [22963] localedata: cs_CZ: Add alternative month names [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling [22996] localedata: change LC_PAPER to en_US in es_BO locale [22998] dynamic-link: execstack tests are disabled when SELinux is disabled [23005] network: Crash in __res_context_send after memory allocation failure [23007] math: strtod cannot handle -nan [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set [23036] regex: regex equivalence class regression [23037] libc: initialize msg_flags to zero for sendmmsg() calls [23069] libc: sigaction broken on riscv64-linux-gnu [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable patterns in runpath entries (e.g. $ORIGIN$ORIGIN) [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit and libc build with -Os) [23140] localedata: More languages need two forms of month names [23145] libc: _init/_fini aren't marked as hidden [23152] localedata: gd_GB: Fix typo in "May" (abbreviated) [23171] math: C++ iseqsig for long double converts arguments to double [23178] nscd: sudo will fail when it is run in concurrent with commands that changes /etc/passwd [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies (CVE-2018-11237) [23206] dynamic-link: static-pie + dlopen breaks debugger interaction [23208] localedata: New locale - Lower Sorbian (dsb) [23233] regex: Memory leak in build_charclass_op function in file posix/regcomp.c [23236] stdio: Harden function pointers in _IO_str_fields [23250] nptl: Offset of __private_ss differs from GCC [23253] math: tgamma test suite failures on i686 with -march=x86-64 -mtune=generic -mfpmath=sse [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for AT_SECURE [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus- parser.c [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY [23277] math: nan function should not have const attribute [23279] math: scanf and strtod wrong for some hex floating-point [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and directed rounding [23290] localedata: IBM273 is not equivalent to ISO-8859-1 [23303] build: undefined reference to symbol '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23' [23307] dynamic-link: Absolute symbols whose value is zero ignored in lookup [23313] stdio: libio vtables validation and standard file object interposition [23329] libc: The __libc_freeres infrastructure is not properly run across DSO boundaries. [23349] libc: Various glibc headers no longer compatible with <linux/time.h> [23351] malloc: Remove unused code related to heap dumps and malloc checking [23363] stdio: stdio-common/tst-printf.c has non-free license [23396] regex: Regex equivalence regression in single-byte locales [23422] localedata: oc_FR: More updates of locale data [23442] build: New warning with GCC 8 [23448] libc: Out of bounds access in IBM-1390 converter [23456] libc: Wrong index_cpu_LZCNT [23458] build: tst-get-cpu-features-static isn't added to tests [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel processors [23467] dynamic-link: x86/CET: A property note parser bug Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.28 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Agustina Arzille Alan Modra Alexandre Oliva Amit Pawar Andreas Schwab Andrew Senkevich Andrew Waterman Aurelien Jarno Carlos O'Donell Chung-Lin Tang DJ Delorie Daniel Alvarez David Michael Dmitry V. Levin Dragan Stanojevic - Nevidljivi Florian Weimer Flávio Cruz Francois Goichon Gabriel F. T. Gomes H.J. Lu Herman ten Brugge Hongbo Zhang Igor Gnatenko Jesse Hathaway John David Anglin Joseph Myers Leonardo Sandoval Maciej W. Rozycki Mark Wielaard Martin Sebor Michael Wolf Mike FABIAN Patrick McGehearty Patsy Franklin Paul Pluzhnikov Quentin PAGÈS Rafal Luzynski Rajalakshmi Srinivasaraghavan Raymond Nicholson Rical Jasan Richard Braun Robert Buj Rogerio Alves Samuel Thibault Sean McKean Siddhesh Poyarekar Stefan Liebler Steve Ellcey Sylvain Lesage Szabolcs Nagy Thomas Schwinge Tulio Magno Quites Machado Filho Valery Timiriliyev Vincent Chen Wilco Dijkstra Zack Weinberg Zong Li
  • glibc-2.27.9000   Open master branch for glibc 2.28 development
  • glibc-2.27   The GNU C Library ================= The GNU C Library version 2.27 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2008. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at https://www.gnu.org/software/libc/ Packages for the 2.27 release may be downloaded from: https://ftpmirror.gnu.org/libc/ https://ftp.gnu.org/gnu/libc/ The mirror list is at https://www.gnu.org/order/ftp.html NEWS for version 2.27 ===================== Major new features: * The GNU C Library can now be compiled with support for building static PIE executables (See --enable-static-pie in INSTALL). These static PIE executables are like static executables but can be loaded at any address and provide additional security hardening benefits at the cost of some memory and performance. When the library is built with --enable-static-pie the resulting libc.a is usable with GCC 8 and above to create static PIE executables using the GCC option '-static-pie'. This feature is currently supported on i386, x86_64 and x32 with binutils 2.29 or later, and on aarch64 with binutils 2.30 or later. * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf, sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and H.J. Lu from Intel. * Optimized x86-64 trunc and truncf for processors with SSE4.1. * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf. * In order to support faster and safer process termination the malloc API family of functions will no longer print a failure address and stack backtrace after detecting heap corruption. The goal is to minimize the amount of work done after corruption is detected and to avoid potential security issues in continued process execution. Reducing shutdown time leads to lower overall process restart latency, so there is benefit both from a security and performance perspective. * The abort function terminates the process immediately, without flushing stdio streams. Previous glibc versions used to flush streams, resulting in deadlocks and further data corruption. This change also affects process aborts as the result of assertion failures. * On platforms where long double has the IEEE binary128 format (aarch64, alpha, mips64, riscv, s390 and sparc), the math library now implements _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015. These are the same interfaces added in version 2.26 for some platforms where this format is supported but is not the format of long double. * On platforms with support for _Float64x (aarch64, alpha, i386, ia64, mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now implements interfaces for that type, as defined by ISO/IEC TS 18661-3:2015. These are corresponding interfaces to those supported for _Float128. * The math library now implements interfaces for the _Float32, _Float64 and _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are corresponding interfaces to those supported for _Float128. * glibc now implements the memfd_create and mlock2 functions on Linux. * Support for memory protection keys was added. The <sys/mman.h> header now declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set, pkey_get. * The copy_file_range function was added. * Optimized memcpy, mempcpy, memmove, and memset for sparc M7. * The ldconfig utility now processes `include' directives using the C/POSIX collation ordering. Previous glibc versions used locale-specific ordering, the change might break systems that relied on that. * Support for two grammatical forms of month names has been added. In a call to strftime, the "%B" and "%b" format specifiers will now produce the grammatical form required when the month is used as part of a complete date. New "%OB" and "%Ob" specifiers produce the form required when the month is named by itself. For instance, in Greek and in many Slavic and Baltic languages, "%B" will produce the month in genitive case, and "%OB" will produce the month in nominative case. In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh" are all valid and will all accept any known form of month name---standalone or complete, abbreviated or full. In a call to nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return the strings used by "%B" and "%b", respectively. New query constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings used by "%OB" and "%Ob", respectively. In a locale definition file, use "alt_mon" and "ab_alt_mon" to define the strings for %OB and %Ob, respectively; these have the same syntax as "mon" and "abmon". These arrays are optional; if they are not provided then they have the same content as "mon" and "abmon", respectively. These features are provided for locales which define "alt_mon" and/or "ab_alt_mon" in their locale source data. This release includes such alternative month name data for the following languages: Belarusian, Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian. This feature is currently a GNU extension, but it is expected to be added to the next revision of POSIX, and it is also already available on some BSD-derived operating systems. This feature will cause existing statically compiled applications to fail to load locales and fall back to the builtin C/POSIX locales. See notes below for other changes affecting compatibility. * Support for the RISC-V ISA running on Linux has been added. This port requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported for the following ISA and ABI pairs: - rv64imac lp64 - rv64imafdc lp64 - rv64imafdc lp64d Deprecated and removed features, and other changes affecting compatibility: * Statically compiled applications attempting to load locales compiled for the GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX locale. The reason for this is that the addition of the new "%OB" and "%Ob", support for two grammatical forms of the month names, also extends the locale data binary format. Static applications needing locale support must be recompiled to match the runtime and data they are deployed with. In some distributions there is an upgrade window where dynamically linked applications may use a new library but the old locale data and also fall back to the builtin C/POSIX locales; restarting the application process is sufficient to fix this. * Support for statically linked applications which call dlopen is deprecated and will be removed in a future version of glibc. Applications which call dlopen need to be linked dynamically instead. * Support for old programs which use internal stdio data structures and functions is deprecated. This includes programs which use the C++ streams provided by libstdc++ in GCC 2.95. Programs which use the internal symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish, _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn, _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach, _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen, _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open, _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff, _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow, _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all, _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area, _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end, _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in, _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock, _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark, _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static, _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow, _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode, _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish, _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow, _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write, _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow, _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a future version of glibc. Unlike other symbol removals, these old applications will not be supported using compatibility symbols. * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer defined by <sys/ptrace.h>. * libm no longer supports SVID error handling (calling a user-provided matherr function on error) or the _LIB_VERSION variable to control error handling. (SVID error handling and the _LIB_VERSION variable still work for binaries linked against older versions of the GNU C Library.) The libieee.a library is no longer provided. math.h no longer defines struct exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW, TLOSS, PLOSS and HUGE. * The libm functions pow10, pow10f and pow10l are no longer supported for new programs. Programs should use the standard names exp10, exp10f and exp10l for these functions instead. * The mcontext_t type is no longer the same as struct sigcontext. On platforms where it was previously the same, this changes the C++ name mangling for interfaces involving this type. * The add-ons mechanism for building additional packages at the same time as glibc has been removed. The --enable-add-ons configure option is now ignored. * The --without-fp configure option is now ignored. Whether hardware floating-point instructions are used is now configured based on whether the compiler used at configure time (without any options implied by a --with-cpu= configure option) uses such instructions. * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that the specified string can be parsed as a domain name. * In the malloc_info output, the <heap> element may contain another <aspace> element, "subheaps", which contains the number of sub-heaps. * The libresolv function p_secstodate is no longer supported for new programs. * The tilepro-*-linux-gnu configuration is no longer supported. * The nonstandard header files <libio.h> and <_G_config.h> are deprecated and will be removed in a future release. Software that is still using either header should be updated to use standard <stdio.h> interfaces instead. libio.h was originally the header for a set of supported GNU extensions, but they have not been maintained as such in many years, they are now standing in the way of improvements to stdio, and we don't think there are any remaining external users. _G_config.h was never intended for public use, but predates the bits convention. Changes to build and runtime requirements: * bison version 2.7 or later is required to generate code in the 'intl' subdirectory. Security related changes: CVE-2009-5064: The ldd script would sometimes run the program under examination directly, without preventing code execution through the dynamic linker. (The glibc project disputes that this is a security vulnerability; only trusted binaries must be examined using the ldd script.) CVE-2017-15670: The glob function, when invoked with GLOB_TILDE, suffered from a one-byte overflow during ~ operator processing (either on the stack or the heap, depending on the length of the user name). Reported by Tim Rühsen. CVE-2017-15671: The glob function, when invoked with GLOB_TILDE, would sometimes fail to free memory allocated during ~ operator processing, leading to a memory leak and, potentially, to a denial of service. CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and without GLOB_NOESCAPE, could write past the end of a buffer while unescaping user names. Reported by Tim Rühsen. CVE-2017-17426: The malloc function, when called with an object size near the value SIZE_MAX, would return a pointer to a buffer which is too small, instead of NULL. This was a regression introduced with the new malloc thread cache in glibc 2.26. Reported by Iain Buclaw. CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads to the allocation of too much memory. (This is not a security bug per se, it is mentioned here only because of the CVE assignment.) Reported by Qualys. CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation of the number of search path components. (This is not a security vulnerability per se because no trust boundary is crossed if the fix for CVE-2017-1000366 has been applied, but it is mentioned here only because of the CVE assignment.) Reported by Qualys. CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN for AT_SECURE or SUID binaries could be used to load libraries from the current directory. CVE-2018-1000001: Buffer underflow in realpath function when getcwd function succeeds without returning an absolute path due to unexpected behaviour of the Linux kernel getcwd syscall. Reported by halfdog. CVE-2018-6485: The posix_memalign and memalign functions, when called with an object size near the value of SIZE_MAX, would return a pointer to a buffer which is too small, instead of NULL. Reported by Jakub Wilk. Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.27 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Akhilesh Kumar Alan Hayward Alan Modra Alexandre Oliva Alexey Makhalov Andreas Schwab Arjun Shankar Arnold Robbins Aurelien Jarno Bernd Edlinger Carlos O'Donell Chris Metcalf Christian Brauner Claude Paroz DJ Delorie David S. Miller Dmitry V. Levin Dragan Stanojević - Nevidljivi Egmont Koblinger Eric Blake Florian Weimer Gabriel F. T. Gomes Guido Trentalancia Gustavo Romero H.J. Lu Il'ya Malakhov Istvan Kurucsai James Clarke John David Anglin Jonathan Wakely Jose E. Marchesi Joseph Myers Julen Ruiz Aizpuru Juro Bystricky Luke Shumaker Markus Trippelsdorf Martin Sebor Michael Collison Mike FABIAN Palmer Dabbelt Patrick McGehearty Patsy Franklin Paul Clarke Paul Eggert Paul Pluzhnikov Peter Zelezny Rafal Luzynski Rajalakshmi Srinivasaraghavan Rical Jasan Richard Henderson Rogerio Alves Romain Naour Samuel Thibault Sergei Trofimovich Siddhesh Poyarekar Stanislav Brabec Stefan Liebler Steve Ellcey Szabolcs Nagy Thierry Vignaud Thomas Schwinge Thorsten Glaser Tobias Klauser Tulio Magno Quites Machado Filho Victor Rodriguez Wang Boshi Wei-Lun Chao Wilco Dijkstra Will Hawkins Yury Norov Zack Weinberg
    23158b08 · Update for 2.27 release ·
  • glibc-2.26.9000   Open master branch for glibc 2.27 development
  • glibc-2.16.90   Open master branch for glibc 2.17 development
  • glibc-2.17.90   Open master branch for glibc 2.18 development