Tags: riscv-mcu/riscv-glibc
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The GNU C Library version 2.35 is now available The GNU C Library ================= The GNU C Library version 2.35 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 2.35 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 2.35 ===================== Major new features: * Unicode 14.0.0 Support: Character encoding, character type info, and transliteration tables are all updated to Unicode 14.0.0, using generator scripts contributed by Mike FABIAN (Red Hat). * Bump r_version in the debugger interface to 2 and add a new field, r_next, support multiple namespaces. * Support for the C.UTF-8 locale has been added to glibc. The locale supports full code-point sorting for all valid Unicode code points. A limitation in the framework for fnmatch, regexec, and regcomp requires a compromise to save space and only ASCII-based range expressions are supported for now (see bug 28255). The full size of the locale is only ~400KiB, with 346KiB coming from LC_CTYPE information for Unicode. This locale harmonizes downstream C.UTF-8 already shipping in various downstream distributions. The locale is not built into glibc, and must be installed. * <math.h> functions that round their results to a narrower type, and corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS 18661-3:2015 and draft ISO C2X: - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx, fMxsqrtfN and fMxsqrtfNx functions. - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and fMxfmafNx functions. * <math.h> functions for floating-point maximum and minimum, corresponding to new operations in IEEE 754-2019, and corresponding <tgmath.h> macros, are added from draft ISO C2X: fmaximum, fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num, fminimum_mag, fminimum_mag_num and corresponding functions for float, long double, _FloatN and _FloatNx. * <math.h> macros for single-precision float constants are added as a GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf, M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and M_SQRT1_2f. * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are predefined as specified in TS 18661-1:2014. * The exp10 functions in <math.h> now have a corresponding type-generic macro in <tgmath.h>. * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>. * printf-family functions now support the %b format for output of integers in binary, as specified in draft ISO C2X, and the %B variant of that format recommended by draft ISO C2X. * A new DSO sorting algorithm has been added in the dynamic linker that uses topological sorting by depth-first search (DFS), solving performance issues of the existing sorting algorithm when encountering particular circular object dependency cases. * A new tunable, glibc.rtld.dynamic_sort, can be used to select between the two DSO sorting algorithms. The default setting of '2' uses the new DFS-based algorithm. The setting '1' switches to the old algorithm used in glibc 2.33 and earlier. * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant to be used by compilers for optimizing usage of 'memcmp' when its return value is only used for its boolean status. * Support for automatically registering threads with the Linux rseq system call has been added. This system call is implemented starting from Linux 4.18. The Restartable Sequences ABI accelerates user-space operations on per-cpu data. It allows user-space to perform updates on per-cpu data without requiring heavy-weight atomic operations. Automatically registering threads allows all libraries, including libc, to make immediate use of the rseq support by using the documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size variables. The GNU C Library manual has details on integration of Restartable Sequences. * A symbolic link to the dynamic linker is now installed under /usr/bin/ld.so (or more precisely, '${bindir}/ld.so'). * All programs and the testsuite in glibc are now built as position independent executables (PIE) by default on toolchains and architectures that support it. Further, if the toolchain and architecture supports it, even static programs are built as PIE and the resultant glibc can be used to build static PIE executables. A new option --disable-default-pie has been added to disable this behavior and get a non-PIE build. This option replaces --enable-static-pie, which no longer has any effect on the build configuration. * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk or to use huge pages directly with mmap calls with the MAP_HUGETLB flags). The former can improve performance when Transparent Huge Pages is set to 'madvise' mode while the latter uses the system reserved huge pages. * The printf family of functions now handles the flagged %#m conversion specifier, printing errno as an error constant (similar to strerrorname_np). * The function _dl_find_object has been added. In-process unwinders can use it to efficiently locate unwinding information for a code address. * Support for OpenRISC running on Linux has been added. This port requires as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float ABI is supported: - or1k-linux-gnu The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and 64-bit file offsets (LFS default). * A new configure option, --with-rtld-early-cflags, can be used to specify additional compiler flags for building the early startup code of the dynamic linker. On targets which have CPU compatibility checks, this can help to ensure that proper diagnostics are printed if the dynamic loader runs on an incompatible CPU. * On Linux, the epoll_pwait2 function has been added. It is similar to epoll_wait with the difference the timeout has nanoseconds resolution. * The function posix_spawn_file_actions_addtcsetpgrp_np has been added, enabling posix_spawn and posix_spawnp to set the controlling terminal in the new process in a race free manner. This function is a GNU extension. * Source fortification (_FORTIFY_SOURCE) level 3 is now available for applications compiling with glibc and gcc 12 and later. Level 3 leverages the __builtin_dynamic_object_size function to deliver additional fortification balanced against additional runtime cost (checking non-constant bounds). Deprecated and removed features, and other changes affecting compatibility: * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support has been removed since the first PT_LOAD segment is no longer executable due to defaulting to -z separate-code. * The r_version update in the debugger interface makes the glibc binary incompatible with GDB binaries built without the following commits: c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface when audit modules or dlmopen are used. * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed. * The --enable-static-pie option is no longer available. The glibc build configuration script now automatically detects static-pie support in the toolchain and architecture and enables it if available. * The catchsegv script and associated libSegFault.so shared object have been removed. There are widely-deployed out-of-process alternatives for catching coredumps and backtraces. * Support for prelink will be removed in the next release; this includes removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment variables and their functionality in the dynamic loader. Changes to build and runtime requirements: * The audit module interface version LAV_CURRENT is increased to enable proper bind-now support. The loader now advertises via the la_symbind flags that PLT trace is not possible. New audit modules require the new dynamic loader supporing the latest LAV_CURRENT version. Old audit modules are still loaded for all targets except aarch64. * The audit interface on aarch64 is extended to support both the indirect result location register (x8) and NEON Q register. Old audit modules are rejected by the loader. Audit modules must be rebuilt to use the newer structure sizes and the latest module interface version for LAV_CURRENT. Security related changes: CVE-2022-23219: Passing an overlong file name to the clnt_create legacy function could result in a stack-based buffer overflow when using the "unix" protocol. Reported by Martin Sebor. CVE-2022-23218: Passing an overlong file name to the svcunix_create legacy function could result in a stack-based buffer overflow. CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath function could result in a memory leak and potential access of uninitialized memory. Reported by Qualys. CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd function may result in an off-by-one buffer underflow and overflow when the current working directory is longer than PATH_MAX and also corresponds to the / directory through an unprivileged mount namespace. Reported by Qualys. The following bugs are resolved with this release: [12889] nptl: Race condition in pthread_kill [14232] nptl: tst-cancel7 and tst-cancelx7 race condition [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when many dsos [15333] libc: Use 64-bit stat functions in installed programs [15533] dynamic-link: LD_AUDIT introduces an avoidable performance degradation [15971] dynamic-link: No interface for debugger access to libraries loaded with dlmopen [17318] locale: [RFE] Provide a C.UTF-8 locale by default [17645] dynamic-link: RFE: Improve performance of dynamic loader for deeply nested DSO dependencies. [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread ID whose lifetime has not ended [22542] network: buffer overflow in sunrpc clnt_create (CVE-2022-23219) [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of TRACE_LOADED_OBJECTS [25947] malloc: memory leak in muntrace [26045] math: fmaxf(inf, nan) does not always work [26108] math: exp10() has problems with <tgmath.h> [26779] build: benign use after realloc at localealias.c:329 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[] [27945] build: build-many-glibcs.py doesn't configure GCC with --enable-initfini-array [27991] build: x86: sysdeps/x86/configure.ac breaks when libc_cv_include_x86_isa_level is loaded from cache [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np in __REDIRECT_NTH macro [28061] dynamic-link: A failing dlmopen called by an auditor crashed [28062] dynamic-link: Suppress audit calls when a (new) namespace is empty [28126] libc: nftw aborts for paths longer than PATH_MAX [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when built with ld.lld [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl [28185] math: Inaccurate j0f function (again) [28199] locale: iconvconfig prefix flag behaves differently in glibc 2.34 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic} should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for robustness [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604) [28223] libc: mips: clone does not align stack [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after AT_MINSIGSTKSZ [28256] malloc: Conditional jump or move depends on uninitialised value(s) in __GI___tunables_init [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst- spawn5 fail if stray fds are open [28310] libc: Do not use affinity mask for sysconf (_SC_NPROCESSORS_CONF) [28338] time: undefined behavior in __tzfile_compute with oddball TZif file [28340] dynamic-link: ld.so crashes while loading a DSO with a read- only dynamic section [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg() [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by recvmsg() [28353] network: Race condition on __opensock [28357] dynamic-link: deadlock between pthread_create and ctors [28358] math: f64xdivf128 and f64xmulf128 spurious underflows [28361] nptl: Fix for bug 12889 causes setxid deadlock [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c [28390] localedata: Update locale data to Unicode 14.0.0 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for C2X [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set locale "en_US.UTF-8" [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent to tgkill (getpid (), gettid()) [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work [28457] dynamic-link: Missing reldepmod4.so dependency for globalmod1.so [28469] time: linux: struct timex is not correctly set for 32-bit systems with TIMESIZE=64 [28470] regex: Buffer read overrun in regular expression searching [28475] string: Incorrect access attribute on memfrob [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit spurious NUL character on state reset [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is incorrect [28550] dynamic-link: FAIL: tst-dso- ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1) execution test [28554] build: Undefined generate-md5 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on hppa [28607] nptl: Masked signals are delivered on thread exit [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to lack of cpu counting /proc fallback with glibc 2.34 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build [28648] dynamic-link: Running ld.so on statically linked binaries crashes [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to binutils changes [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored [28678] nptl: nptl/tst-create1 hangs sporadically [28688] dynamic-link: PT_LOAD p_align check is too strict [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database is not useful [28707] time: assert in tzfile.c __tzfile_read striking with truncated timezones generated by tzcode-2021d and later [28713] math: GCC 12 miscompiles libm [28732] dynamic-link: FAIL: elf/tst-dl_find_object [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le [28746] libc: _FORTIFY_SOURCE does not work for stpcpy [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main: Assertion `GL(dl_rtld_map).l_libname' failed! [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex [28757] nptl: GDB printer tests failed with new GDB [28765] math: x86_64 libmvec atan2 accuracy [28766] manual: Document libmvec accuracy [28768] network: Buffer overflow in svcunix_create with long pathnames (CVE-2022-23218) [28769] libc: Off-by-one buffer overflow/underflow in getcwd() (CVE-2021-3999) [28770] libc: Unexpected return value from realpath() for too long results (CVE-2021-3998) [28771] libc: %ebx optimization macros are incompatible with .altmacro in Systemtap probes [28780] build: --disable-default-pie doesn't work on static programs [28782] libc: x86-64 ISA level for glibc itself is always x86-64-baseline [28792] glob: possible wrong behaviour with patterns with double [ with no closing ] [28837] libc: FAIL: socket/tst-socket-timestamp-compat [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non- empty mon_decimal_point_wc Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.35 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 Akila Welihinda Alexandra Hájková Andrea Monaco Andreas Schwab Anton Blanchard Arjun Shankar Aurelien Jarno Ben Woodard Carlos O'Donell Chung-Lin Tang Cristian Rodríguez DJ Delorie Fangrui Song Florian Weimer H.J. Lu Hans-Peter Nilsson Jangwoong Kim Jiaxun Yang John David Anglin Jonathan Wakely Joseph Myers Khem Raj Kurt Kanzenbach Luca Boccassi Mark Wielaard Martin Sebor Matheus Castanho Matt Whitlock Maxim Kuvyrkov Michael Kerrisk Mike FABIAN Naohiro Tamura Naohiro Tamura via Libc-alpha Nart Tlisha Nikita Popov Noah Goldstein Patrick McGehearty Paul A. Clarke Paul E. Murphy Paul Eggert Paul Zimmermann Robbie Harwood Romain GEISSLER Rongwei Wang Samuel Thibault Sergey Bugaev Siddhesh Poyarekar Stafford Horne Stefan Liebler Sunil K Pandey Szabolcs Nagy Thomas Petazzoni Tulio Magno Quites Machado Filho Wilco Dijkstra Xi Ruoyao maminjie
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
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
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
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
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