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* trap UB from attempts to join a detached threadRich Felker2017-08-111-0/+1
| | | | | | | | | | | | | | passing to pthread_join the id of a thread which is not joinable results in undefined behavior. in principle the check to trap does not necessarily work if pthread_detach was called after thread creation, since no effort is made here to synchronize access to t->detached, but the check is well-defined and harmless for callers which did not invoke UB, and likely to help catch erroneous code that would otherwise mysteriously hang. patch by William Pitcock.
* ppc64: fix setjmp/longjmp handling of TOC pointerBobby Bingham2017-08-113-17/+39
| | | | | | | | | | | | | | | | | | | | | | | | | | The TOC pointer is constant within a single dso, but needs to be saved and restored around cross-dso calls. The PLT stub saves it to the caller's stack frame, and the linker adds code to the caller to restore it. With a local call, as within a single dso or with static linking, this doesn't happen and the TOC pointer is always in r2. Therefore, setjmp/longjmp need to save/restore the TOC pointer from/to different locations depending on whether the call to setjmp was a local or non-local call. It is always safe for longjmp to restore to both r2 and the caller's stack. If the call to setjmp was local, and only r2 matters and the stack location will be ignored, but is required by the ABI to be reserved for the TOC pointer. If the call was non-local, then only the stack location matters, and whatever is restored into r2 will be clobbered anyway when the caller reloads r2 from the stack. A little extra care is required for sigsetjmp, because it uses setjmp internally. After the second return from this setjmp call, r2 will contain the caller's TOC pointer instead of libc's TOC pointer. We need to save and restore the correct libc pointer before we can tail call to __sigsetjmp_tail.
* qsort: add a short comment about the algorithmLeah Neukirchen2017-08-111-0/+3
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* add _NL_LOCALE_NAME extension to nl_langinfoRich Felker2017-07-311-0/+4
| | | | | | | | | | | | | | | | | since setlocale(cat, NULL) is required to return the setting for the global locale, there is no standard mechanism to obtain the name of the currently active thread-local locale set by uselocale. this makes it impossible for application/library software to load appropriate translations, etc. unless using the gettext implementation provided by libc, which has privileged access to libc internals. to fill this gap, glibc introduced the _NL_LOCALE_NAME macro which can be used with nl_langinfo to obtain the name. GNU gettext/gnulib code already use this functionality on glibc, and can easily be adapted to make use of it on non-glibc systems if it's available; for other systems they poke at locale implementation internals, which we want to avoid. this patch provides a compatible interface to the one glibc introduced.
* fix missing volatile qualifier on lock in __get_localeJens Gustedt2017-07-041-1/+1
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* remove ineffective compiler assist from printfAlexander Monakov2017-07-042-4/+0
| | | | | | The switch statement has no 'default:' case and the function ends immediately following the switch, so the extra comparison did not communicate any extra information to the compiler.
* fix undefined behavior in ptraceAlexander Monakov2017-07-041-2/+6
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* unify the use of FUTEX_PRIVATEJens Gustedt2017-07-044-4/+4
| | | | | | The flag 1<<7 is used in several places for different purposes that are not always easy to distinguish. Mark those usages that correspond to the flag that is used by the kernel for futexes.
* fix undefined behavior in freeAlexander Monakov2017-07-041-2/+3
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* reapply va_arg hacks removal to wprintfAlexander Monakov2017-07-041-26/+1
| | | | | commit 58e2396a9aa23c132faf4198ca4d779c84955b38 missed that the same code was duplicated in implementation of vfwprintf.
* powerpc64: add single-instruction math functionsRich Felker2017-06-2322-0/+290
| | | | | | | | | | while the official elfv2 abi for "powerpc64le" sets power8 as the baseline isa, we use it for both little and big endian powerpc64 targets and need to maintain compatibility with pre-power8 models. the instructions for sqrt, fabs, and fma are in the baseline isa; support for the rest is conditional via predefined isa-level macros. patch by David Edelsohn.
* s390x: add single-instruction math functionsRich Felker2017-06-2324-0/+360
| | | | | | | | these were introduced in z196 and not available in the baseline (z900) ISA level. use __HTM__ as an alternate indicator for ISA level, since gcc did not define __ARCH__ until 7.x. patch by David Edelsohn.
* fix arm run-time abi string functionsSzabolcs Nagy2017-06-226-36/+76
| | | | | | | | | in arm rtabi these __aeabi_* functions have special abi (they are only allowed to clobber r0,r1,r2,r3,ip,lr,cpsr), so they cannot be simple wrappers around normal string functions (which may clobber other registers), the safest solution is to write them in asm, a minimalistic implementation works because these are not supposed to be emitted by compilers or used in general.
* fix regression in getspnam[_r] error code for insufficient buffer sizeRich Felker2017-06-211-1/+1
| | | | | commit 2d7d05f031e014068a61d3076c6178513395d2ae wrongly changed ERANGE to EINVAL, likely as the result of copy-and-paste error.
* fix iconv conversions for iso88592-iso885916Bartosz Brachaczek2017-06-201-1/+1
| | | | | | | commit 97bd6b09dbe7478d5a90a06ecd9e5b59389d8eb9 refactored the table lookup into a function and introduced an error in index computation. the error caused garbage to be read from the table if the given charmap had a non-zero number of elided entries.
* handle errors from localtime_r in ctime_rRich Felker2017-06-201-3/+2
| | | | | | | | POSIX requires ctime_r return a null pointer on failure, which can occur if the input time_t value is not representable in broken down form. based on patch by Alexander Monakov.
* set errno when getpw*_r, getgr*_r, and getspnam_r failRich Felker2017-06-153-3/+7
| | | | | | | | | these functions return an error code, and are not explicitly documented to set errno, but they are nonstandard and the historical implementations do set errno as well, and some applications expect this behavior. do likewise for compatibility. patch by Rudolph Pereira.
* handle localtime errors in ctimeRich Felker2017-06-151-1/+3
| | | | | | | | ctime passes the result from localtime directly to asctime. But in case of error, localtime returns 0. This causes an error (NULL pointer dereference) in asctime. based on patch by Omer Anson.
* handle mremap failure in realloc of mmap-serviced allocationsRich Felker2017-06-151-1/+2
| | | | | | | | | mremap seems to always fail on nommu, and on some non-Linux implementations of the Linux syscall API, it at least fails to increase allocation size, and may fail to move (i.e. defragment) the existing mapping when shrinking it too. instead of failing realloc or leaving an over-sized allocation that may waste a large amount of memory, fallback to malloc-memcpy-free if mremap fails.
* getdate: correctly specify error numberA. Wilcox2017-06-141-1/+2
| | | | | | | | | | POSIX defines getdate error #5 as: "An I/O error is encountered while reading the template file." POSIX defines getdate error #7 as: "There is no line in the template that matches the input." This change correctly disambiguates between the two error conditions.
* catopen: set errno to EOPNOTSUPPA. Wilcox2017-06-141-0/+2
| | | | | | | Per 1003.1-2008 (2016 ed.), catopen must set errno on failure. We set errno to EOPNOTSUPP because musl does not currently support message catalogues.
* fix glob failure to match plain "/" to root directoryRich Felker2017-06-081-1/+1
| | | | | | | | the check to prevent matching empty string wrongly blocked matching of "/" due to checking emptiness after stripping leading slashes rather than checking the full original argument string. simplified from patch by Julien Ramseier.
* use hard-coded sh4a atomic opcodes to avoid linker errors on shRich Felker2017-06-081-4/+4
| | | | | | | when using the sh4a opcodes, the assembler tags the resulting object file as requiring sh4a. the linker then refuses to (static) link it with object files marked as requiring j2, since there is no isa level that includes both sh4a and j2 instructions.
* towupper/towlower: fast path for ascii charsNatanael Copa2017-05-311-3/+3
| | | | | Make a fast path for ascii chars which is assumed to be the most common case. This has significant performance benefit on xml json and similar
* fix fchown fallback on arches without chown(2)Samuel Holland2017-05-271-1/+1
| | | | | | The flags argument was missing, causing uninitalized data to be passed to fchownat(2). The correct value of flags should match the fallback for chown(3).
* fix iconv conversions to legacy 8bit encodingsRich Felker2017-05-271-9/+12
| | | | | | | | | | there was missing reverse-conversion logic for the case, handled specially in the character set tables, where a byte represents a unicode codepoint with the same value. this patch adds code to handle the case, and refactors the two-level 10-bit table lookup for legacy character sets into a function to avoid repeating it yet another time as part of the fix.
* have posix_spawnattr_setflags check for supported flagsRich Felker2017-04-221-0/+11
| | | | | | | | | | | | per POSIX, EINVAL is not a mandatory error, only an optional one. but reporting unsupported flags allows an application to fallback gracefully when a requested feature is not supported. this is not helpful now, but it may be in the future if additional flags are added. had this checking been present before, applications would have been able to check for the newly-added POSIX_SPAWN_SETSID feature (added in commit bb439bb17108b67f3df9c9af824d3a607b5b059d) at runtime.
* implement new posix_spawn flag POSIX_SPAWN_SETSIDRich Felker2017-04-221-0/+4
| | | | | | | this functionality has been adopted for inclusion in the next issue of POSIX as the result of Austin Group issue #1044. based on patch by Daurnimator.
* remove va_arg hacks in printf core with undefined behaviorRich Felker2017-04-221-26/+1
| | | | | | | | | | | | | | the code being removed was written to optimize for size assuming the compiler cannot collapse code paths for different types with the same underlying representation. modern compilers sometimes succeed in making this optimization themselves, but either way it's a small size difference and not worth the source-level complexity or the UB involved in this hack. some incorrect use of va_arg still remains, particularly use of void * where the actual argument has a different pointer type. fixing this requires some actual code additions, rather than just removing cruft, so I'm leaving it to be done later as a separate commit.
* make ttyname[_r] return ENODEV rather than ENOENTRich Felker2017-04-211-1/+1
| | | | | | | | | | | | | commit 0a950dcf15bb9f7274c804dca490e9e20e475f3e added checking that the pathname a tty device was opened with actually matches the device, which can fail to hold when a container inherits a tty from outside the container. the error code added at the time was ENOENT; however, discussions between affected applications and glibc developers resulted in glibc adopting ENODEV as the error for this condition, and this has now been documented in the man pages project as well. adopt the same error code for consistency. patch by Christian Brauner.
* fix regression in support for resolv.conf attempts optionRich Felker2017-04-211-2/+2
| | | | | | | | commit d6cb08bcaca4ff1f921375510ca72bccea969c75 moved the code and introduced an incorrect string offset for the new parsing, probably due to a copy-and-paste error. patch by Stefan Sedich.
* fix scalbn when result is in the subnormal rangeSzabolcs Nagy2017-04-213-12/+14
| | | | | | | | | | | | | | | | in nearest rounding mode scalbn could introduce double rounding error when an intermediate value and the final result were both in the subnormal range e.g. scalbn(0x1.7ffffffffffffp-1, -1073) returned 0x1p-1073 instead of 0x1p-1074, because the intermediate computation got rounded to 0x1.8p-1023. with the fix an intermediate value can only be in the subnormal range if the final result is 0 which is correct even after double rounding. (there still can be two roundings so signals may be raised twice, but that's only observable with trapping exceptions which is not supported.)
* allow full-range file offsets to mmap on archs with 64-bit syscall argsRich Felker2017-04-211-1/+1
| | | | | | | normally 32-bit archs use the mmap2 syscall and are limited to an offset of 2^32 pages. however some 32-bit archs (mainly ILP32-on-64 ones like x32) have 64-bit syscall argument slots and thus can accept the full range. don't artifically limit them.
* fix dl_iterate_phdr in static PIE binariesRich Felker2017-04-111-0/+5
| | | | | | | | | analogous to commit 5bf7eba213cacc4c1220627c91c28deff2ffecda, use of AT_PHDR/PT_PHDR does not actually work to find the program base, and the method with _DYNAMIC vs PT_DYNAMIC must be used as an alternative. patch by Shiz, along with testing to confirm that this fixes unwinding in static PIE.
* fix read past end of buffer in getaddrinfo backendRich Felker2017-04-111-2/+2
| | | | | | | | | | | | | | due to testing buf[i].family==AF_INET before checking i==cnt, it was possible to read past the end of the array, or past the valid part. in practice, without active bounds/indeterminate-value checking by the compiler, the worst that happened was failure to return early and optimize out the sorting that's unneeded for v4-only results. returning on i==cnt-1 rather than i==cnt would be an alternate fix, but the approach this patch takes is more idiomatic and less error-prone. patch by Timo Teräs.
* aarch64: add single instruction math functionsSzabolcs Nagy2017-03-2134-24/+226
| | | | | | | | | | | | | | | | | | | | | | | | this should increase performance and reduce code size on aarch64. the compiled code was checked against using __builtin_* instead of inline asm with gcc-6.2.0. lrint is two instructions. c with inline asm is used because it is safer than a pure asm implementation, this prevents ll{rint,round} to be an alias of l{rint,round} (because the types don't match) and depends on gcc style inline asm support. ceil, floor, round, trunc can either raise inexact on finite non-integer inputs or not raise any exceptions. the new implementation does not raise exceptions while the generic c code does. on aarch64, the underflow exception is signaled before rounding (ieee 754 allows both before and after rounding, but it must be consistent), the generic fma c code signals it after rounding so using single instruction fixes a slight conformance issue too.
* fix strptime output for %C without %yJulien Ramseier2017-03-211-2/+3
| | | | | in this case, a potentially-uninitialized or unrelated existing value in tm_year was being used. instead use 0 if %y was not present.
* fix processing of strptime %p formatJulien Ramseier2017-03-211-0/+2
| | | | string pointer was not advanced after matching.
* fix off-by-one in strptime %jJulien Ramseier2017-03-211-0/+1
| | | | tm_yday range is 0-365 while %j is 1-366
* regex: fix newline matching with negated bracketsJulien Ramseier2017-03-211-0/+14
| | | | | | With REG_NEWLINE, POSIX says: "A <newline> in string shall not be matched by a period outside a bracket expression or by any form of a non-matching list"
* increase limit on locale name length from 15 to 23 bytesRich Felker2017-03-211-1/+1
| | | | | | | | | | | | | | | | the old limit was one byte too short to support locale names of the form xx_XX.UTF-8@modifier where modifier is more than 3 bytes, a form which various real-world locale names take. the problem could be avoided by omitting the useless ".UTF-8" part, but users may need to have it present when operating on mixed-libc systems or when it will be carried over (e.g. across ssh) to other systems. the new limit is chosen sufficient for existing/reasonable locale names while still keeping the size of setlocale's static buffer small. also add locale_impl.h to the Makefile's list of headers which force rebuild of source files, to prevent dangerously inconsistent object files from getting used after this change.
* search locale name variants for gettext translationsRich Felker2017-03-211-32/+55
| | | | | | | | | | | | | | | | | | | | | | | often translations will be named only by language, whereas locale names may also include a territory code, modifier, and codeset portion. previously, only translations exactly matching the locale name were loaded. this was a major usability issue, requiring workarounds like symlinks or tweaking of the locale name. with these changes, gettext now searches for translations by first removing the codeset portion of the locale name, then trying the remainder in full, with modifier (@mod) removed, with territory code (_XX) removed, and with both removed. part of the reason gettext lacked support for searching fallbacks before is that the candidate pathname for a translation file was constructed on each call and used as the key to lookup an already-mapped translation file. this was very costly/inefficient. we now use the tuple of textdomain binding pointer, locale map pointer, and integer category id as the key for looking up a translation file mapping. based on patch by He X.
* make setlocale return a single name for LC_ALL if all categories matchRich Felker2017-03-211-2/+5
| | | | | | | | | when called for LC_ALL, setlocale has to return a string representing the state of all locale categories. the simplest way to do this was to always return a delimited list of values for each category, but that's not friendly in the fairly common case where all categories have the same setting. He X proposed a patch to check for this case and return a single name; this patch is a simplified approach to do the same.
* fix POSIX-format TZ dst transition times for southern hemisphereRich Felker2017-03-151-8/+4
| | | | | | | | | | the time of day at which daylight time switches over is specified in local time in the dst state prior to the transition. the code for handling this wrongly assumed it needed to switch whether dst or standard offset is applied to the transition time when the dst end date is before the dst start date (souther hemisphere summer), but in fact the end transition time should always be adjusted for dst, and the start transition time should always be adjusted for standard time.
* fix threshold constants in j0f, y0f, j1f, y1fSzabolcs Nagy2017-03-152-13/+12
| | | | | | | | | | | | | partly following freebsd rev 279491 https://svnweb.freebsd.org/base?view=revision&revision=279491 (musl had some of the fixes before freebsd). the change should not matter much for j0f, y0f, but it improves j1f and y1f in [2.5,~3.75] (that is [0x40200000,~0x40700000]). near roots (e.g. around 3.8317 for j1f) there are still large ulp errors. dropped code that tried to raise inexact.
* fix one-byte overflow in legacy getpass functionRich Felker2017-03-141-1/+1
| | | | | if the length of the input was equal to the buffer size (128), a fixed value of zero was written one byte past the end of the static buffer.
* fix wide scanf's use of a compound literal past its lifetimeRich Felker2017-03-141-1/+2
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* fix possible fd leak, unrestored cancellation state on dns socket failRich Felker2017-03-141-1/+5
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* in static dl_iterate_phdr, fix use of possibly-uninitialized aux dataRich Felker2017-03-141-1/+1
| | | | | this could only happen if an incomplete auxv was passed into the program, but it's better to just initialize the data anyway.
* fix free of uninitialized buffer pointer on error in regexecRich Felker2017-03-141-3/+3
| | | | | | | | | the fix in commit c3edc06d1e1360f3570db9155d6b318ae0d0f0f7 for CVE-2016-8859 used gotos to exit on overflow conditions, but the code in that error path assumed the buffer pointer was valid or null. thus, the conditions which previously led to under-allocation and buffer overflow could instead lead to an invalid pointer being passed to free.
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