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GNU C Library NEWS -- history of user-visible changes.
Copyright (C) 1992-2021 Free Software Foundation, Inc.
See the end for copying conditions.
Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
using `glibc' in the "product" field.
Version 2.35
Major new features:
Add LoongArch Port. Loongson Ltd.
Deprecated and removed features, and other changes affecting compatibility:
[Add deprecations, removals and changes affecting compatibility here]
Changes to build and runtime requirements:
[Add changes to build and runtime requirements here]
Security related changes:
[Add security related changes here]
The following bugs are resolved with this release:
[The release manager will add the list generated by
scripts/list-fixed-bugs.py just before the release.]
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
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()
[23091] hurd: missing waitid support
[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)
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* ABIs are 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 -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 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 function 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 function returns error number name (e.g. "EINVAL" for EINVAL)
while strerrordesc_np returns a string describing the 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 depend 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 <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
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