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* fix mismatched signatures for strtod_l familyRich Felker2021-12-092-7/+22
| | | | | | | | | | | | | strtod_l, strtof_l, and strtold_l originally existed only as glibc-ABI-compat symbols. as noted in the commit which added them, 17a60f9d327c6f8b5707a06f9497d846e75c01f2, making them aliases for the non-_l functions was a hack and not appropriate if they ever became public API. unfortunately, commit 35eb1a1a9b97577e113240cd65bf9fc44b8df030 did make them public without undoing the hack. fix that now by moving the the _l functions to their own file as wrappers that just throw away the locale_t argument.
* fix hwcap access in powerpc-sf setjmp/longjmpRich Felker2021-11-292-2/+2
| | | | | | | commit 7be59733d71ada3a32a98622507399253f1d5e48 introduced the hwcap-based branches to support the SPE FPU, but wrongly coded them as bitwise tests on the computed address of __hwcap, not a value loaded from that address. replace the add with indexed load to fix it.
* fix struct layout mismatch in sound ioctl time32 fallback conversionRich Felker2021-10-191-2/+7
| | | | | | | | | | | | | | | | | | | | | | the snd_pcm_mmap_control struct used with SNDRV_PCM_IOCTL_SYNC_PTR was mistakenly defined in the kernel uapi with "before u32" padding both before and after the first u32 member. our conversion between the modern struct and the legacy time32 struct was written without awareness of that mistake, and assumed the time64 version of the struct was the intended form with padding to match the layout on 64-bit archs. as a result, the struct was not converted correctly when running on old kernels, with audio glitches as the likely result. this was discovered thanks to a related bug in the kernel, whereby 32-bit userspace running on a 64-bit kernel also suffered from the types mismatching. the mistaken layout is now the ABI and can't be changed -- or at least making a new ioctl to change it would just result in a worse situation. our conversion here is changed to treat the snd_pcm_mmap_control substruct as two separate substructs at locations dependent on endianness (since the displacement depends on endianness), using the existing conversion framework.
* add qsort_r and make qsort a wrapper around itÉrico Nogueira2021-09-233-17/+35
| | | | | | | | | | | | | we make qsort a wrapper by providing a wrapper_cmp function that uses the extra argument as a function pointer. should be optimized to a tail call on most architectures, as long as it's built with -fomit-frame-pointer, so the performance impact should be minimal. to keep the git history clean, for now qsort_r is implemented in qsort.c and qsort is implemented in qsort_nr.c. qsort.c also received a few trivial cleanups, including replacing (*cmp)() calls with cmp(). qsort_nr.c contains only wrapper_cmp and qsort as a qsort_r wrapper itself.
* add SPE FPU support to powerpc-sfRich Felker2021-09-238-8/+68
| | | | | | | | | | | | | | | | | | | When the soft-float ABI for PowerPC was added in commit 5a92dd95c77cee81755f1a441ae0b71e3ae2bcdb, with Freescale cpus using the alternative SPE FPU as the main use case, it was noted that we could probably support hard float on them, but that it would involve determining some difficult ABI constraints. This commit is the completion of that work. The Power-Arch-32 ABI supplement defines the ABI profiles, and indeed ATR-SPE is built on ATR-SOFT-FLOAT. But setjmp/longjmp compatibility are problematic for the same reason they're problematic on ARM, where optional float-related parts of the register file are "call-saved if present". This requires testing __hwcap, which is now done. In keeping with the existing powerpc-sf subarch definition, which did not have fenv, the fenv macros are not defined for SPE and the SPEFSCR control register is left (and assumed to start in) the default mode.
* fix undefined behavior in getdelim via null pointer arithmetic and memcpyRich Felker2021-09-111-3/+5
| | | | | | | | | both passing a null pointer to memcpy with length 0, and adding 0 to a null pointer, are undefined. in some sense this is 'benign' UB, but having it precludes use of tooling that strictly traps on UB. there may be better ways to fix it, but conditioning the operations which are intended to be no-ops in the k==0 case on k being nonzero is a simple and safe solution.
* fix error checking in pthread_getname_npÉrico Nogueira2021-08-061-1/+1
| | | | | | | len is unsigned and can never be smaller than 0. though unlikely, an error in read() would have lead to an out of bounds write to name. Reported-by: Michael Forney <mforney@mforney.org>
* fix libc-internal signal blocking on mips archsRich Felker2021-07-291-2/+2
| | | | | | | | | | | | due to historical reasons, the mips signal set has 128 bits rather than 64 like on every other arch. this was special-cased correctly, at least for 32-bit mips, at one time, but was inadvertently broken in commit 7c440977db9444d7e6b1c3dcb1fdf4ee49ca4158, and seems never to have been right on mips64/n32. as consequenct of this bug, applications making use of high realtime signal numbers on mips may have been able to execute application code in contexts where doing so was unsafe.
* math: fix fmaf not to depend on FE_TOWARDZEROSzabolcs Nagy2021-07-061-11/+10
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* fix TZ parsing logic for identifying POSIX-form stringsRich Felker2021-06-231-1/+13
| | | | | | | | | | | | | | | | previously, the contents of the TZ variable were considered a candidate for a file/path name only if they began with a colon or contained a slash before any comma. the latter was very sloppy logic to avoid treating any valid POSIX TZ string as a file name, but it also triggered on values that are not valid POSIX TZ strings, including 3-letter timezone names without any offset. instead, only treat the TZ variable as POSIX form if it begins with a nonzero standard time name followed by +, -, or a digit. also, special case GMT and UTC to always be treated as POSIX form (with implicit zero offset) so that a stray file by the same name cannot break software that depends on setting TZ=GMT or TZ=UTC.
* remove return with expression in void functionMichael Forney2021-04-271-1/+1
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* add pthread_getname_np functionÉrico Rolim2021-04-201-0/+25
| | | | based on the pthread_setname_np implementation
* fix popen not to leak pipes from one child to anotherRich Felker2021-04-201-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | POSIX places an obscure requirement on popen which is like a limited version of close-on-exec: "The popen() function shall ensure that any streams from previous popen() calls that remain open in the parent process are closed in the new child process." if the POSIX-future 'e' mode flag is passed, producing a pipe FILE with FD_CLOEXEC on the underlying pipe, this requirement is automatically satisfied. however, for applications which use multiple concurrent popen pipes but don't request close-on-exec, fd leaks from earlier popen calls to later ones could produce deadlock situations where processes are waiting for a pipe EOF that will never happen. to fix this, iterate through all open FILEs and add close actions for those obtained from popen. this requires holding a lock on the open file list across the posix_spawn call so that additional popen FILEs are not created after the list is traversed. note that it's still possible for another popen call to start and create its pipe while the lock is held, but such pipes are created with O_CLOEXEC and only drop close-on-exec status (when 'e' flag is omitted) under control of the lock.
* remove spurious lock in popenRich Felker2021-04-201-2/+0
| | | | | | | the newly allocated FILE * has not yet leaked to the application and is only visible to stdio internals until popen returns. since we do not change any fields of the structure observed by libc internals, only the pipe_pid member, locking is not necessary.
* nscd: fall back gracefully on kernels without AF_UNIX supportJoakim Sindholt2021-04-161-1/+9
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* mallocng/aligned_alloc: check for malloc failureDominic Chen2021-04-161-0/+3
| | | | | | With mallocng, calling posix_memalign() or aligned_alloc() will SIGSEGV if the internal malloc() call returns NULL. This does not occur with oldmalloc, which explicitly checks for allocation failure.
* make epoll_[p]wait a cancellation pointRich Felker2021-04-031-2/+2
| | | | | | | | | this is a Linux-specific function and not covered by POSIX's requirements for which interfaces are cancellation points, but glibc makes it one and existing software relies on it being one. at some point a review for similar functions that should be made cancellation points should be done.
* fix dl_iterate_phdr dlpi_tls_data reporting to match specRich Felker2021-03-261-1/+2
| | | | | | | | | | dl_iterate_phdr was wrongly reporting the address of the DSO's PT_TLS image rather than the calling thread's instance of the TLS. the man page, which is essentially normative for a nonstandard function of this sort, clearly specifies the latter. it does not clarify where exactly within/relative-to the image the pointer should point, but the reasonable thing to do is match the ABI's DTP offset, and this seems to be what other implementations do.
* remove no-longer-needed special case handling in popenRich Felker2021-03-151-16/+0
| | | | | | | | | | popen was special-casing the possibility (only possible when the parent closed stdin and/or stdout) that the child's end of the pipe was already on the final desired fd number, in which case there was no way to get rid of its close-on-exec flag in the child. commit 6fc6ca1a323bc0b6b9e9cdc8fa72221ae18fe206 made this unnecessary by implementing the POSIX-future requirement that dup2 file actions with equal source and destination fd values remove the close-on-exec flag.
* use internal malloc for posix_spawn file actions objectsRich Felker2021-03-151-0/+5
| | | | | | this makes it possible to perform actions on file actions objects with a libc-internal lock held without creating lock order relationships that are silently imposed on an application-provided malloc.
* fix error return value for cuseridRich Felker2021-02-131-2/+3
| | | | | | | the historical function was specified to return an empty string in the caller-provided buffer, not a null pointer, to indicate error when the argument is non-null. only when the argument is null should it return a null pointer on error.
* fix misuse of getpwuid_r in cuseridRich Felker2021-02-131-1/+2
| | | | | | getpwuid_r can return 0 but without a result in the case where there was no error but no record exists. in that case cuserid was treating it as success and copying junk out of pw.pw_name to the output buffer.
* cuserid: don't return truncated resultsRich Felker2021-02-131-1/+5
| | | | checking the length also drops the need to pull in snprintf.
* cuserid: support invocation with a null pointer argumentSören Tempel2021-02-131-0/+2
| | | | | | this function was removed from the standard in 2001 but appeared in SUSv2 with an obligation to support calls with a null pointer argument, using a static buffer.
* math: fix expm1f overflow thresholdSzabolcs Nagy2021-02-101-2/+1
| | | | | | | | | the threshold was wrong so expm1f overflowed to inf a bit too early and on most targets uint32_t compare is faster than float compare so use that. this also fixes sinhf incorrectly returning nan for some values where the internal expm1f overflowed.
* math: fix acoshf for negative inputsSzabolcs Nagy2021-02-101-4/+4
| | | | | | | | | | | | | | | | | | | | on some negative inputs (e.g. -0x1.1e6ae8p+5) acoshf failed to return nan. ensure that negative inputs result nan without introducing new branches. this was tried before in commit 101e6012856918440b5d7474739c3fc22a8d3b85 math: fix acoshf on negative values but that fix was wrong. there are 3 formulas used: log1p(x-1 + sqrt((x-1)*(x-1)+2*(x-1))) log(2*x - 1/(x+sqrt(x*x-1))) log(x) + 0.693147180559945309417232121458176568 the first fails on large negative inputs (may compute log1p(0) or log1p(inf)), the second one fails on some mid range or large negative inputs (may compute log(large) or log(inf)) and the last one fails on -0 (returns -inf).
* fix possible fd leak via missing O_CLOEXEC in pthread_setname_npÉrico Rolim2021-01-301-1/+1
| | | | | the omission of the flag here seems to have been an oversight when the function was added in 8fb28b0b3e7a5e958fb844722a4b2ef9bc244af1
* oldmalloc: preserve errno across freeRich Felker2021-01-301-0/+4
| | | | | | | | as an outcome of Austin Group issue #385, future versions of the standard will require free not to alter the value of errno. save and restore it individually around the calls to madvise and munmap so that the cost is not imposed on calls to free that do not result in any syscall.
* fix build regression in oldmallocRich Felker2021-01-301-1/+1
| | | | | | commit 8d37958d58cf36f53d5fcc7a8aa6d633da6071b2 inadvertently broke oldmalloc by having it implement __libc_malloc rather than __libc_malloc_impl.
* preserve errno across freeRich Felker2021-01-301-2/+10
| | | | | | | | as an outcome of Austin Group issue #385, future versions of the standard will require free not to alter the value of errno. save and restore it individually around the calls to madvise and munmap so that the cost is not imposed on calls to free that do not result in any syscall.
* fix inconsistent signature of __libc_start_mainRich Felker2021-01-301-1/+2
| | | | | | | | | | | | | | | | | | | | | | | commit 7586360badcae6e73f04eb1b8189ce630281c4b2 removed the unused arguments from the definition of __libc_start_main, making it incompatible with the declaration at the point of call, which still passed 6 arguments. calls with mismatched function type have undefined behavior, breaking LTO and any other tooling that checks for function signature mismatch. removing the extra arguments from the point of call (crt1) is not an option for fixing this, since that would be a change in ABI surface between application and libc. adding back the extra arguments requires some care. on archs that pass arguments on the stack or that reserve argument spill space for the callee on the stack, it imposes an ABI requirement on the caller to provide such space. the modern crt1.c entry point provides such space, but originally there was arch-specific asm for the call to __libc_start_main. the last of this asm was removed in commit 6fef8cafbd0f6f185897bc87feb1ff66e2e204e1, and manual review of the code removed and its prior history was performed to check that all archs/variants passed the legacy init/fini/ldso_fini arguments.
* fail posix_spawn file_actions operations with negative fdsRich Felker2021-01-304-0/+4
| | | | | | | | | | | these functions are specified to fail with EBADF on negative fd arguments. apart from close, they are also specified to fail if the value exceeds OPEN_MAX, but as written it is not clear that this imposes any requirement when OPEN_MAX is not defined, and it's undesirable to impose a dynamic limit (via setrlimit) here since the limit at the time of posix_spawn may be different from the limit at the time of setting up the file actions. this may require revisiting later.
* fix VIDIOC_DQEVENT (v4l2) ioctl fallback for pre-5.6 kernelsRich Felker2020-12-141-1/+9
| | | | | | | | | | | | commit 2412638bb39eb799b2600393bbd71cca8ae96bb2 got the size of struct v4l2_event wrong and failed to account for the fact that the old struct might be either 120 bytes with time misaligned mod 8, or 128 bytes with time aligned mod 8, due to the contained union having 64-bit members whose alignment is arch-dependent. rather than adding new logic to handle the differences, use an actual stripped-down version of the structure in question to derive the ioctl number, size, and offsets.
* fix v4l2 buffer ioctl fallbacks for pre-5.6 kernelsArnd Bergmann2020-12-141-4/+4
| | | | | | | | commit 2412638bb39eb799b2600393bbd71cca8ae96bb2 got the size of struct v4l2_buffer wrong and omitted the tv_usec member slot from the offset list, so the ioctl numbers never matched and fallback code path was never taken. this caused the affected ioctls to fail with ENOTTY on kernels not new enough to have the native time64 ioctls.
* use libc-internal malloc for newlocale/freelocaleRich Felker2020-12-092-0/+10
| | | | | | | this is necessary for MT-fork correctness now that the code runs under locale lock. it would not be hard to avoid, but __get_locale is already using libc-internal malloc anyway. this can be reconsidered during locale overhaul later if needed.
* drop use of pthread_once in newlocaleRich Felker2020-12-091-9/+7
| | | | | | | in general, pthread_once is not compatible with MT-fork constraints (commit 167390f05564e0a4d3fcb4329377fd7743267560). here it actually no longer matters, because it's now called with a lock held, but since the lock is held it's pointless to use pthread_once.
* lift locale lock out of internal __get_localeRich Felker2020-12-094-18/+19
| | | | | | this allows the lock to be shared with setlocale, eliminates repeated per-category lock/unlock in newlocale, and will allow the use of pthread_once in newlocale to be dropped (to be done separately).
* fix misleading comment in strstrRich Felker2020-12-091-1/+1
| | | | | | | | the intent here is just to scan at least l bytes forward for the end of the haystack and at least some decent minimum to avoid doing it over and over if the needle is short, with no need to be precise. the comment erroneously stated this as an estimate for MIN when it's actually an estimate for MAX.
* drop use of pthread_once for aio thread stack size initRich Felker2020-12-081-10/+8
| | | | | | | | | | | | | pthread_once is not compatible with MT-fork constraints (commit 167390f05564e0a4d3fcb4329377fd7743267560) and is not needed here anyway; we already have a lock suitable for initialization. while changing this, fix a corner case where AT_MINSIGSTKSZ gives a value that's more than MINSIGSTKSZ but by a margin of less than 2048, thereby causing the size to be reduced. it shouldn't matter but the intent was to be the larger of a 2048-byte margin over the legacy fixed minimum stack requirement or a 512-byte margin over the minimum the kernel reports at runtime.
* fix omission of non-stub pthread_mutexattr_getprotocolRich Felker2020-12-071-1/+1
| | | | | | | this change should have been made when priority inheritance mutex support was added. if priority protection is also added at some point the implementation will need to change and will probably no longer be a simple bit shuffling.
* fix failure to preserve r6 in s390x asm; per ABI it is call-savedRich Felker2020-12-042-0/+8
| | | | | | | | | | | | | | | | | | both __clone and __syscall_cp_asm failed to restore the original value of r6 after using it as a syscall argument register. the extent of breakage is not known, and in some cases may be mitigated by the only callers being internal to libc; if they used r6 but no longer needed its value after the call, they may not have noticed the problem. however at least posix_spawn (which uses __clone) was observed returning to the application with the wrong value in r6, leading to crash. since the call frame ABI already provides a place to spill registers, fixing this is just a matter of using it. in __clone, we also spuriously restore r6 in the child, since the parent branch directly returns to the caller. this takes the value from an uninitialized slot of the child's stack, but is harmless since there is no caller to return to in the child.
* implement reallocarrayAriadne Conill2020-11-301-0/+13
| | | | | | | | reallocarray is an extension introduced by OpenBSD, which introduces calloc overflow checking to realloc. glibc 2.28 introduced support for this function behind _GNU_SOURCE, while glibc 2.29 allows its usage in _DEFAULT_SOURCE.
* implement realpath directly instead of using procfs readlinkRich Felker2020-11-301-23/+136
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | inability to use realpath in chroot/container without procfs access and at early boot prior to mount of /proc has been an ongoing issue, and it turns out realpath was one of the last remaining interfaces that needed procfs for its core functionality. during investigation while reimplementing, it was determined that there were also serious problems with the procfs-based implementation. most seriously it was unsafe on pre-O_PATH kernels, and unlike other places where O_PATH was used, the unsafety was hard or impossible to fix because O_NOFOLLOW can't be used (since the whole purpose was to follow symlinks). the new implementation is a direct one, performing readlink on each path component to resolve it. an explicit stack, as opposed to recursion, is used to represent the remaining components to be processed. the stack starts out holding just the input string, and reading a link pushes the link contents onto the stack. unlike many other implementations, this one does not call getcwd initially for relative pathnames. instead it accumulates initial .. components to be applied to the working directory if the result is still a relative path. this avoids calling getcwd (which may fail) at all when symlink traversal will eventually yield an absolute path. it also doesn't use any form of stat operation; instead it arranges for readlink to tell it when a non-directory is used in a context where a directory is needed. this minimizes the number of syscalls needed, avoids accessing inodes when the directory table suffices, and reduces the amount of code pulled in for static linking.
* fix mallocng regression in malloc_usable_size with null argumentDominic Chen2020-11-291-0/+1
| | | | | commit d1507646975cbf6c3e511ba07b193f27f032d108 added support for null argument in oldmalloc and was overlooked when switching to mallocng.
* fix segfault in lutimes when tv argument is NULLÉrico Rolim2020-11-291-5/+7
| | | | | | | calling lutimes with tv=0 is valid if the application wants to set the timestamps to the current time. this commit makes it so the timespec struct is populated with values from tv only if tv != 0 and calls utimensat with times=0 if tv == 0.
* arm fabs and sqrt: support single-precision-only fpu variantsJinliang Li2020-11-292-2/+2
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* work around linux bug in readlink syscall with zero buffer sizeRich Felker2020-11-232-3/+17
| | | | | | | | | | linux fails with EINVAL when a zero buffer size is passed to the syscall. this is non-conforming because POSIX already defines EINVAL with a significantly different meaning: the target is not a symlink. since the request is semantically valid, patch it up by using a dummy buffer of length one, and truncating the return value to zero if it succeeds.
* parse v3 or future-unknown zoneinfo file versions as v2+Rich Felker2020-11-221-1/+1
| | | | | | | | the v1 zoneinfo format with 32-bit time is deprecated. previously, the v2 parsing code was only used if an exact match for '2' was found in the version field of the header. this was already incorrect for v3 files (trivial differences from v2 that arguably didn't merit a new version number anyway) but also failed to be future-proof.
* explicitly prefer 64-bit/v2 zoneinfo tablesRich Felker2020-11-221-1/+1
| | | | | | | | | since commit 38143339646a4ccce8afe298c34467767c899f51, the condition sizeof(time_t) > 4 is always true, so there is no functional change being made here. but semantically, the 64-bit tables should always be preferred now, because upstream zic (zoneinfo compiler) has quietly switched to emitting empty 32-bit tables by default, and the resulting backwards-incompatible zoneinfo files will be encountered in the wild.
* fix regression in pthread_exitRich Felker2020-11-202-1/+3
| | | | | | | | | | | | | | | commit d26e0774a59bb7245b205bc8e7d8b35cc2037095 moved the detach state transition at exit before the thread list lock was taken. this inadvertently allowed pthread_join to race to take the thread list lock first, and proceed with unmapping of the exiting thread's memory. we could fix this by just revering the offending commit and instead performing __vm_wait unconditionally before taking the thread list lock, but that may be costly. instead, bring back the old DT_EXITING vs DT_EXITED state distinction that was removed in commit 8f11e6127fe93093f81a52b15bb1537edc3fc8af, and don't transition to DT_EXITED (a value of 0, which is what pthread_join waits for) until after the lock has been taken.
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-04-25 22:03:06 +0000