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* linux: Add pidfd_getfdAdhemerval Zanella2022-05-1738-3/+47
| | | | | | | | | | This was added on Linux 5.6 (8649c322f75c96e7ced2fec201e123b2b073bf09) as a way to retrieve a file descriptors for another process though pidfd (created either with CLONE_PIDFD or pidfd_getfd). The functionality is similar to recvmmsg SCM_RIGHTS. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* linux: Add pidfd_openAdhemerval Zanella2022-05-1739-1/+133
| | | | | | | | | This was added on Linux 5.3 (32fcb426ec001cb6d5a4a195091a8486ea77e2df) as a way to retrieve a pid file descriptors for process that has not been created CLONE_PIDFD (by usual fork/clone). Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* aarch64: Move ld.so _start to separate file and drop _dl_skip_argsSzabolcs Nagy2022-05-173-75/+56
| | | | | | | | | | | | | A separate asm file is easier to maintain than a macro that expands to inline asm. The RTLD_START macro is only needed now because _dl_start is local in rtld.c, but _start has to call it, if _dl_start was made hidden then it could be empty. _dl_skip_args is no longer needed. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* linux: Add a getauxval test [BZ #23293]Szabolcs Nagy2022-05-172-0/+75
| | | | | | | | This is for bug 23293 and it relies on the glibc test system running tests via explicit ld.so invokation by default. Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* rtld: Remove DL_ARGV_NOT_RELRO and make _dl_skip_args constSzabolcs Nagy2022-05-1712-153/+5
| | | | | | | | | | | _dl_skip_args is always 0, so the target specific code that modifies argv after relro protection is applied is no longer used. After the patch relro protection is applied to _dl_argv consistently on all targets. Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* rtld: Use generic argv adjustment in ld.so [BZ #23293]Szabolcs Nagy2022-05-172-30/+73
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When an executable is invoked as ./ld.so [ld.so-args] ./exe [exe-args] then the argv is adujusted in ld.so before calling the entry point of the executable so ld.so args are not visible to it. On most targets this requires moving argv, env and auxv on the stack to ensure correct stack alignment at the entry point. This had several issues: - The code for this adjustment on the stack is written in asm as part of the target specific ld.so _start code which is hard to maintain. - The adjustment is done after _dl_start returns, where it's too late to update GLRO(dl_auxv), as it is already readonly, so it points to memory that was clobbered by the adjustment. This is bug 23293. - _environ is also wrong in ld.so after the adjustment, but it is likely not used after _dl_start returns so this is not user visible. - _dl_argv was updated, but for this it was moved out of relro, which changes security properties across targets unnecessarily. This patch introduces a generic _dl_start_args_adjust function that handles the argument adjustments after ld.so processed its own args and before relro protection is applied. The same algorithm is used on all targets, _dl_skip_args is now 0, so existing target specific adjustment code is no longer used. The bug affects aarch64, alpha, arc, arm, csky, ia64, nios2, s390-32 and sparc, other targets don't need the change in principle, only for consistency. The GNU Hurd start code relied on _dl_skip_args after dl_main returned, now it checks directly if args were adjusted and fixes the Hurd startup data accordingly. Follow up patches can remove _dl_skip_args and DL_ARGV_NOT_RELRO. Tested on aarch64-linux-gnu and cross tested on i686-gnu. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* scripts/glibcelf.py: Add *T_RISCV_* constantsFlorian Weimer2022-05-161-0/+12
| | | | | | | | | SHT_RISCV_ATTRIBUTES, PT_RISCV_ATTRIBUTES, DT_RISCV_VARIANT_CC were added in commit 0b6c6750732483b4d59c2fcb45484079cd84157d ("Update RISC-V specific ELF definitions"). This caused the elf/tst-glibcelf consistency check to fail. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Remove dl-librecon.h header.Adhemerval Zanella2022-05-167-116/+4
| | | | | | | | | | | | | | | | | | | | | | | The Linux version used by i686 and m68k provide three overrrides for generic code: 1. DISTINGUISH_LIB_VERSIONS to print additional information when libc5 is used by a dependency. 2. EXTRA_LD_ENVVARS to that enabled LD_LIBRARY_VERSION environment variable. 3. EXTRA_UNSECURE_ENVVARS to add two environment variables related to aout support. None are really requires, it has some decades since libc5 or aout suppported was removed and Linux even remove support for aout files. The LD_LIBRARY_VERSION is also dead code, dl_correct_cache_id is not used anywhere. Checked on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* elf: Remove ldconfig kernel version checkAdhemerval Zanella2022-05-1614-207/+91
| | | | Now that it was removed on libc.so.
* Remove kernel version checkAdhemerval Zanella2022-05-1617-309/+33
| | | | | | | | | | | | | | | | | | | | The kernel version check is used to avoid glibc to run on older kernels where some syscall are not available and fallback code are not enabled to handle graciously fail. However, it does not prevent if the kernel does not correctly advertise its version through vDSO note, uname or procfs. Also kernel version checks are sometime not desirable by users, where they want to deploy on different system with different kernel version knowing the minimum set of syscall is always presented on such systems. The kernel version check has been removed along with the LD_ASSUME_KERNEL environment variable. The minimum kernel used to built glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed when libc.so is issued. Checked on x86_64-linux-gnu.
* linux: Use /sys/devices/system/cpu on __get_nprocs_conf (BZ#28991)Adhemerval Zanella2022-05-161-32/+4
| | | | | | | | | | | | | | | | | | | | | Currently on Linux __get_nprocs_conf first tries to enumerate the cpus present in the system by iterating on /sys/devices/system/cpuX directories. This only enumerates the CPUs that are present in system (but possibly offline), not taking in account possible CPU that might added in the system through hotplugging. Linux provides the maximum number of configured cpus on the /sys/devices/system/cpu file. Although it might present a larger value of possible active CPUs on some system (where kernel either get the information from firmaware or is configured at boot time), the information is what kernel presents to userland. This also change the returned value of _SC_NPROCESSORS_CONF, which aligns as the maximum configure cpu in the system. Checked on x86_64-linux-gnu. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* csu: Implement and use _dl_early_allocate during static startupFlorian Weimer2022-05-167-10/+202
| | | | | | | | | | | This implements mmap fallback for a brk failure during TLS allocation. scripts/tls-elf-edit.py is updated to support the new patching method. The script no longer requires that in the input object is of ET_DYN type. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Linux: Introduce __brk_call for invoking the brk system callFlorian Weimer2022-05-165-78/+71
| | | | | | Alpha and sparc can now use the generic implementation. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sys/cdefs.h: Do not require C++ compilers to define __STDC__Jonathan Wakely2022-05-161-2/+2
| | | | | | | | | | | | | | The check for an ISO C compiler assumes that anything GCC-like will define __STDC__, even if it's actually a C++ compiler. That's currently true for G++ and compilers like clang++ that also define __GNUC__, but it might not always be true. The C++ standard leaves it implementation-defined whether or not __STDC__ is defined by C++ compilers. And really the check should be "ISO C or ISO C++ conforming compiler" anyway. So only give an error if __GNUC__ is defined and neither __STDC__ nor __cplusplus is defined. Reviewed-by: Fangrui Song <maskray@google.com>
* fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141]Siddhesh Poyarekar2022-05-161-1/+1
| | | | | | | | | | | | | The fix c8ee1c85 introduced a -1 check for object size without also checking that object size is a constant. Because of this, the tree optimizer passes in gcc fail to fold away one of the branches in __glibc_fortify and trips on a spurious Wstringop-overflow. The warning itself is incorrect and the branch does go away eventually in DCE in the rtl passes in gcc, but the constant check is a helpful hint to simplify code early, so add it in. Resolves: BZ #29141 Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Update RISC-V specific ELF definitionsAndreas Schwab2022-05-161-0/+15
| | | | The definitions are taken from the 1.0-rc2 version of the ELF psABI.
* x86_64: Remove bzero optimizationAdhemerval Zanella2022-05-1611-235/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Both symbols are marked as legacy in POSIX.1-2001 and removed on POSIX.1-2008, although the prototypes are defined for _GNU_SOURCE or _DEFAULT_SOURCE. GCC also replaces bcopy with a memmove and bzero with memset on default configuration (to actually get a bzero libc call the code requires to omit string.h inclusion and built with -fno-builtin), so it is highly unlikely programs are actually calling libc bzero symbol. On a recent Linux distro (Ubuntu 22.04), there is no bzero calls by the installed binaries. $ cat count_bstring.sh #!/bin/bash files=`IFS=':';for i in $PATH; do test -d "$i" && find "$i" -maxdepth 1 -executable -type f; done` total=0 for file in $files; do symbols=`objdump -R $file 2>&1` if [ $? -eq 0 ]; then ncalls=`echo $symbols | grep -w $1 | wc -l` ((total=total+ncalls)) if [ $ncalls -gt 0 ]; then echo "$file: $ncalls" fi fi done echo "TOTAL=$total" $ ./count_bstring.sh bzero TOTAL=0 Checked on x86_64-linux-gnu.
* RISC-V: Use an autoconf template to produce `preconfigure'Maciej W. Rozycki2022-05-132-15/+82
| | | | | | | | | | | | | | | Avoid fiddling with autoconf internals and use AC_DEFINE_UNQUOTED to define macros in the configuration headers rather than handcoding an equivalent shell sequence with the use of the `as_echo' undocumented variable. Switch to using AC_MSG_ERROR rather than `echo' and `exit' directly for error handling. Owing to the lack of any kind of error annotation it makes it difficult to spot the message in the flood in a parallel build and neither it is logged in `config.log'. Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
* MIPS: Use an autoconf template to produce `preconfigure'Maciej W. Rozycki2022-05-132-2/+39
| | | | | | | | | | | | Avoid fiddling with autoconf internals and use AC_DEFINE_UNQUOTED to define macros in the configuration headers rather than handcoding an equivalent shell sequence with the use of the `as_echo' undocumented variable. Similarly use AC_MSG_ERROR for error handling rather than the internal undocumented `as_fn_error' variable. Switch to using 1 as the exit code as it makes no sense to refer $? in the contexts involved, it's not a command failure handled there.
* m68k: Use an autoconf template to produce `preconfigure'Maciej W. Rozycki2022-05-132-2/+27
| | | | | | | Switch to using AC_MSG_ERROR rather than `echo' and `exit' directly for error handling. Owing to the lack of any kind of error annotation it makes it difficult to spot the message in the flood in a parallel build and neither it is logged in `config.log'.
* C-SKY: Use an autoconf template to produce `preconfigure'Maciej W. Rozycki2022-05-132-10/+72
| | | | | | | | | | | | Avoid fiddling with autoconf internals and use AC_DEFINE_UNQUOTED to define macros in the configuration headers rather than handcoding an equivalent shell sequence with the use of the `as_echo' undocumented variable. Switch to using AC_MSG_ERROR rather than `echo' and `exit' directly for error handling. Owing to the lack of any kind of error annotation it makes it difficult to spot the message in the flood in a parallel build and neither it is logged in `config.log'.
* Remove configure fno_unit_at_a_timeAdhemerval Zanella2022-05-133-52/+0
| | | | | | Since it is not used any longer. Reviewed-by: Fangrui Song <maskray@google.com>
* stdio: Remove the usage of $(fno-unit-at-a-time) for siglist.cAdhemerval Zanella2022-05-138-26/+47
| | | | | | | | | | | | | | | | | | The siglist.c is built with -fno-toplevel-reorder to avoid compiler to reorder the compat assembly directives due an assembler issue [1] (fixed on 2.39). This patch removes the compiler flags by split the compat symbol generation in two phases. First the __sys_siglist and __sys_sigabbrev without any compat symbol directive is preprocessed to generate an assembly source code. This generate assembly is then used as input on a platform agnostic siglist.S which then creates the compat definitions. This prevents compiler to move any compat directive prior the _sys_errlist definition itself. Checked on a make check run-built-tests=no on all affected ABIs. Reviewed-by: Fangrui Song <maskray@google.com>
* stdio: Remove the usage of $(fno-unit-at-a-time) for errlist.cAdhemerval Zanella2022-05-1316-33/+120
| | | | | | | | | | | | | | | | | | The errlist.c is built with -fno-toplevel-reorder to avoid compiler to reorder the compat assembly directives due an assembler issue [1] (fixed on 2.39). This patch removes the compiler flags by split the compat symbol generation in two phases. First the _sys_errlist_internal internal without any compat symbol directive is preprocessed to generate an assembly source code. This generate assembly is then used as input on a platform agnostic errlist-data.S which then creates the compat definitions. This prevents compiler to move any compat directive prior the _sys_errlist_internal definition itself. Checked on a make check run-built-tests=no on all affected ABIs. [1] https://sourceware.org/bugzilla/show_bug.cgi?id=29012
* Add declare_object_symbol_alias for assembly codes (BZ #28128)H.J. Lu2022-05-131-6/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | There are 2 problems in: #define declare_symbol_alias(symbol, original, type, size) \ declare_symbol_alias_1 (symbol, original, type, size) #ifdef __ASSEMBLER__ # define declare_symbol_alias_1(symbol, original, type, size) \ strong_alias (original, symbol); \ .type C_SYMBOL_NAME (symbol), %##type; \ .size C_SYMBOL_NAME (symbol), size 1. .type and .size are substituted by arguments. 2. %##type is expanded to "% type" due to the GCC bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101613 But assembler doesn't support "% type". Workaround BZ #28128 by 1. Don't define declare_symbol_alias for assembly codes. 2. Define declare_object_symbol_alias for assembly codes. Reviewed-by: Fangrui Song <maskray@google.com>
* wcrtomb: Make behavior POSIX compliantSiddhesh Poyarekar2022-05-135-20/+41
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The GNU implementation of wcrtomb assumes that there are at least MB_CUR_MAX bytes available in the destination buffer passed to wcrtomb as the first argument. This is not compatible with the POSIX definition, which only requires enough space for the input wide character. This does not break much in practice because when users supply buffers smaller than MB_CUR_MAX (e.g. in ncurses), they compute and dynamically allocate the buffer, which results in enough spare space (thanks to usable_size in malloc and padding in alloca) that no actual buffer overflow occurs. However when the code is built with _FORTIFY_SOURCE, it runs into the hard check against MB_CUR_MAX in __wcrtomb_chk and hence fails. It wasn't evident until now since dynamic allocations would result in wcrtomb not being fortified but since _FORTIFY_SOURCE=3, that limitation is gone, resulting in such code failing. To fix this problem, introduce an internal buffer that is MB_LEN_MAX long and use that to perform the conversion and then copy the resultant bytes into the destination buffer. Also move the fortification check into the main implementation, which checks the result after conversion and aborts if the resultant byte count is greater than the destination buffer size. One complication is that applications that assume the MB_CUR_MAX limitation to be gone may not be able to run safely on older glibcs if they use static destination buffers smaller than MB_CUR_MAX; dynamic allocations will always have enough spare space that no actual overruns will occur. One alternative to fixing this is to bump symbol version to prevent them from running on older glibcs but that seems too strict a constraint. Instead, since these users will only have made this decision on reading the manual, I have put a note in the manual warning them about the pitfalls of having static buffers smaller than MB_CUR_MAX and running them on older glibc. Benchmarking: The wcrtomb microbenchmark shows significant increases in maximum execution time for all locales, ranging from 10x for ar_SA.UTF-8 to 1.5x-2x for nearly everything else. The mean execution time however saw practically no impact, with some results even being quicker, indicating that cache locality has a much bigger role in the overhead. Given that the additional copy uses a temporary buffer inside wcrtomb, it's likely that a hot path will end up putting that buffer (which is responsible for the additional overhead) in a similar place on stack, giving the necessary cache locality to negate the overhead. However in situations where wcrtomb ends up getting called at wildly different spots on the call stack (or is on different call stacks, e.g. with threads or different execution contexts) and is still a hotspot, the performance lag will be visible. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* nptl: Add backoff mechanism to spinlock loopWangyang Guo2022-05-094-2/+89
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When mutiple threads waiting for lock at the same time, once lock owner releases the lock, waiters will see lock available and all try to lock, which may cause an expensive CAS storm. Binary exponential backoff with random jitter is introduced. As try-lock attempt increases, there is more likely that a larger number threads compete for adaptive mutex lock, so increase wait time in exponential. A random jitter is also added to avoid synchronous try-lock from other threads. v2: Remove read-check before try-lock for performance. v3: 1. Restore read-check since it works well in some platform. 2. Make backoff arch dependent, and enable it for x86_64. 3. Limit max backoff to reduce latency in large critical section. v4: Fix strict-prototypes error in sysdeps/nptl/pthread_mutex_backoff.h v5: Commit log updated for regression in large critical section. Result of pthread-mutex-locks bench Test Platform: Xeon 8280L (2 socket, 112 CPUs in total) First Row: thread number First Col: critical section length Values: backoff vs upstream, time based, low is better non-critical-length: 1 1 2 4 8 16 32 64 112 140 0 0.99 0.58 0.52 0.49 0.43 0.44 0.46 0.52 0.54 1 0.98 0.43 0.56 0.50 0.44 0.45 0.50 0.56 0.57 2 0.99 0.41 0.57 0.51 0.45 0.47 0.48 0.60 0.61 4 0.99 0.45 0.59 0.53 0.48 0.49 0.52 0.64 0.65 8 1.00 0.66 0.71 0.63 0.56 0.59 0.66 0.72 0.71 16 0.97 0.78 0.91 0.73 0.67 0.70 0.79 0.80 0.80 32 0.95 1.17 0.98 0.87 0.82 0.86 0.89 0.90 0.90 64 0.96 0.95 1.01 1.01 0.98 1.00 1.03 0.99 0.99 128 0.99 1.01 1.01 1.17 1.08 1.12 1.02 0.97 1.02 non-critical-length: 32 1 2 4 8 16 32 64 112 140 0 1.03 0.97 0.75 0.65 0.58 0.58 0.56 0.70 0.70 1 0.94 0.95 0.76 0.65 0.58 0.58 0.61 0.71 0.72 2 0.97 0.96 0.77 0.66 0.58 0.59 0.62 0.74 0.74 4 0.99 0.96 0.78 0.66 0.60 0.61 0.66 0.76 0.77 8 0.99 0.99 0.84 0.70 0.64 0.66 0.71 0.80 0.80 16 0.98 0.97 0.95 0.76 0.70 0.73 0.81 0.85 0.84 32 1.04 1.12 1.04 0.89 0.82 0.86 0.93 0.91 0.91 64 0.99 1.15 1.07 1.00 0.99 1.01 1.05 0.99 0.99 128 1.00 1.21 1.20 1.22 1.25 1.31 1.12 1.10 0.99 non-critical-length: 128 1 2 4 8 16 32 64 112 140 0 1.02 1.00 0.99 0.67 0.61 0.61 0.61 0.74 0.73 1 0.95 0.99 1.00 0.68 0.61 0.60 0.60 0.74 0.74 2 1.00 1.04 1.00 0.68 0.59 0.61 0.65 0.76 0.76 4 1.00 0.96 0.98 0.70 0.63 0.63 0.67 0.78 0.77 8 1.01 1.02 0.89 0.73 0.65 0.67 0.71 0.81 0.80 16 0.99 0.96 0.96 0.79 0.71 0.73 0.80 0.84 0.84 32 0.99 0.95 1.05 0.89 0.84 0.85 0.94 0.92 0.91 64 1.00 0.99 1.16 1.04 1.00 1.02 1.06 0.99 0.99 128 1.00 1.06 0.98 1.14 1.39 1.26 1.08 1.02 0.98 There is regression in large critical section. But adaptive mutex is aimed for "quick" locks. Small critical section is more common when users choose to use adaptive pthread_mutex. Signed-off-by: Wangyang Guo <wangyang.guo@intel.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* Linux: Implement a useful version of _startup_fatalFlorian Weimer2022-05-093-19/+65
| | | | | | On i386 and ia64, the TCB is not available at this point. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* ia64: Always define IA64_USE_NEW_STUB as a flag macroFlorian Weimer2022-05-092-13/+15
| | | | | | | And keep the previous definition if it exists. This allows disabling IA64_USE_NEW_STUB while keeping USE_DL_SYSINFO defined. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* linux: Fix posix_spawn return code if clone fails (BZ#29109)Adhemerval Zanella2022-05-061-1/+1
| | | | | | The __clone_internal returns the error on errno. Checked on x86_64-linux-gnu.
* benchtests: Add wcrtomb microbenchmarkSiddhesh Poyarekar2022-05-062-0/+140
| | | | | | | | Add a simple benchmark that measures wcrtomb performance with various locales with 1-4 byte characters. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Florian Weimer <fweimer@redhat.com>
* clock_settime/clock_gettime: Use __nonnull to avoid null pointerXiaoming Ni2022-05-052-6/+9
| | | | | | | | | | | | | clock_settime() clock_settime64() clock_gettime() clock_gettime64() Add __nonnull((2)) to avoid null pointer access. Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662 Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084 Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* clock_adjtime: Use __nonnull to avoid null pointerXiaoming Ni2022-05-052-3/+3
| | | | | | | | | | clock_adjtime()/clock_adjtime64() Add __nonnull((2)) to avoid null pointer access. Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662 Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084 Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* ntp_xxxtimex: Use __nonnull to avoid null pointerXiaoming Ni2022-05-052-8/+8
| | | | | | | | | | | | | | ntp_gettime() ntp_gettime64() ntp_gettimex() ntp_gettimex64() ntp_adjtime() Add __nonnull((1)) to avoid null pointer access. Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662 Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084 Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* adjtimex/adjtimex64: Use __nonnull to avoid null pointerXiaoming Ni2022-05-052-4/+4
| | | | | | | | | | Add __nonnull((1)) to the adjtimex()/adjtimex64() function declaration to avoid null pointer access. Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662 Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084 Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* hurd spawni: Fix reauthenticating closed fdsSamuel Thibault2022-05-051-1/+1
| | | | | When an fd is closed, the port cell remains, but the port becomes MACH_PORT_NULL, so we have to guard against it.
* Linux: Define MMAP_CALL_INTERNALFlorian Weimer2022-05-043-12/+30
| | | | | | | | | | | | Unlike MMAP_CALL, this avoids a TCB dependency for an errno update on failure. <mmap_internal.h> cannot be included as is on several architectures due to the definition of page_unit, so introduce a separate header file for the definition of MMAP_CALL and MMAP_CALL_INTERNAL, <mmap_call.h>. Reviewed-by: Stefan Liebler <stli@linux.ibm.com>
* i386: Honor I386_USE_SYSENTER for 6-argument Linux system callsFlorian Weimer2022-05-043-3/+37
| | | | | | | Introduce an int-80h-based version of __libc_do_syscall and use it if I386_USE_SYSENTER is defined as 0. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.SFlorian Weimer2022-05-041-3/+0
| | | | | | | | After commit a78e6a10d0b50d0ca80309775980fc99944b1727 ("i386: Remove broken CAN_USE_REGISTER_ASM_EBP (bug 28771)"), it is never defined. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* manual: Clarify that abbreviations of long options are allowedSiddhesh Poyarekar2022-05-041-1/+2
| | | | | | | | | | The man page and code comments clearly state that abbreviations of long option names are recognized correctly as long as they are unique. Document this fact in the glibc manual as well. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>
* elf: Remove fallback to the start of DT_STRTAB for dladdrFangrui Song2022-05-021-11/+5
| | | | | | | | | | | | | When neither DT_HASH nor DT_GNU_HASH is present, the code scans [DT_SYMTAB, DT_STRTAB). However, there is no guarantee that .dynstr immediately follows .dynsym (e.g. lld typically places .gnu.version after .dynsym). In the absence of a hash table, symbol lookup will always fail (map->l_nbuckets == 0 in dl-lookup.c) as if the object has no symbol, so it seems fair for dladdr to do the same. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* powerpc32: Remove unused HAVE_PPC_SECURE_PLTFangrui Song2022-05-023-44/+0
| | | | | | | 82a79e7d1843f9d90075a0bf2f04557040829bb0 removed the only user of HAVE_PPC_SECURE_PLT. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* dlfcn: Implement the RTLD_DI_PHDR request type for dlinfoFlorian Weimer2022-04-295-5/+159
| | | | | | | | | The information is theoretically available via dl_iterate_phdr as well, but that approach is very slow if there are many shared objects. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@rehdat.com>
* manual: Document the dlinfo functionFlorian Weimer2022-04-291-1/+70
| | | | | Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@rehdat.com>
* Do not use --hash-style=both for building glibc shared objectsFlorian Weimer2022-04-295-61/+0
| | | | | | | | The comment indicates that --hash-style=both was used to maintain compatibility with static dlopen, but we had many internal ABI changes since then, so this compatiblity does not add value anymore. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* benchtests: Better libmvec integrationSiddhesh Poyarekar2022-04-292-19/+17
| | | | | | | | Improve libmvec benchmark integration so that in future other architectures may be able to run their libmvec benchmarks as well. This now allows libmvec benchmarks to be run with `make BENCHSET=bench-math`. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* benchtests: Add UNSUPPORTED benchmark statusSiddhesh Poyarekar2022-04-292-11/+24
| | | | | | | | | | | | The libmvec benchmarks print a message indicating that a certain CPU feature is unsupported and exit prematurelyi, which breaks the JSON in bench.out. Handle this more elegantly in the bench makefile target by adding support for an UNSUPPORTED exit status (77) so that bench.out continues to have output for valid tests. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Fix fchmodat with AT_SYMLINK_NOFOLLOW for 64 bit time_t (BZ#29097)Adhemerval Zanella2022-04-284-6/+30
| | | | | | | | The AT_SYMLINK_NOFOLLOW emulation ues the default 32 bit stat internal calls, which fails with EOVERFLOW if the file constains timestamps beyond 2038. Checked on i686-linux-gnu.
* Use __ehdr_start rather than _begin in _dl_start_finalAlan Modra2022-04-282-6/+4
| | | | | | | | | | __ehdr_start is already used in rltld.c:dl_main, and can serve the same purpose as _begin. Besides tidying the code, using linker defined section relative symbols rather than "-defsym _begin=0" better reflects the intent of _dl_start_final use of _begin, which is to refer to the load address of ld.so rather than absolute address zero. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* sysdeps: Add 'get_fast_jitter' interace in fast-jitter.hNoah Goldstein2022-04-271-0/+42
| | | | | | | | | | | | | | 'get_fast_jitter' is meant to be used purely for performance purposes. In all cases it's used it should be acceptable to get no randomness (see default case). An example use case is in setting jitter for retries between threads at a lock. There is a performance benefit to having jitter, but only if the jitter can be generated very quickly and ultimately there is no serious issue if no jitter is generated. The implementation generally uses 'HP_TIMING_NOW' iff it is inlined (avoid any potential syscall paths). Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-09 18:04:26 +0000