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- 0.5.0 - initial release
- 0.5.9 - signal ABI bugfix, various cleanup and fixes:
- sigset_t was wrongly defined as 1024 bytes instead of 1024 bits,
- breaking the intended ABI compatibility with the LSB/glibc sigaction
- structure. users should upgrade immediately and rebuild any libraries
- or object files that might be using the incorrect definitions.
- improved security against DoS with tcb shadow passwords by checking
- that the file opened was really an ordinary file.
- fixed a bug in the implementation of atomic ops that could have
- allowed the compiler to incorrectly reorder them (in practice, gcc
- with the default settings on i386 was not reordering them).
- greatly improved conformance to the C and POSIX standards regarding
- what the standard header files make visible. _POSIX_C_SOURCE is now
- needed to get POSIX functions in standard C headers, and _XOPEN_SOURCE
- or _GNU_SOURCE are required to get XSI interfaces or GNU extensions,
- respectively.
- many internal improvements have been made to the syscall-related code
- in preparation for porting to x86_64 and other archs.
- 0.6.0 - x86_64 port, various important bugs fixed
- new x86_64 (amd64) architecture port, contributed by Nicholas J. Kain,
- along with PORTING guide. source tree layout and build system have
- been improved to accommodate further ports.
- various bugs that were introduced while making the headers respect C
- and POSIX namespace standards have been fixed. conformance to the
- standards has been improved.
- fixed an inefficiency in qsort that triggered a bug (occasionaly
- internal compiler error) in some versions of gcc.
- fixed a major bug in the printf %n specifier that prevented it from
- working and caused memory corruption.
- 0.7.0 - major improvements to posix conformance and completeness
- implemented posix shared memory and semaphore interfaces.
- implemented all remaining required pthread and clock interfaces.
- major fixes to signal semantics.
- greatly improved temporary file name generation for safety against
- denial of service due to intentional name collisions.
- added syscall wrappers for the linux inotify interface.
- malloc(0) now returns a non-null pointer.
- fixed printf %n specifier (again), pthread_once (it was always
- hanging), and non-default-type mutex behavior.
- added ucontext/sigcontext support in headers to facilitate building
- libgcc with dwarf2 unwind support, and possibly other low-level tools.
- improved musl-gcc compiler wrapper.
- implemented many small missing functions here and there, minor header
- fixes, etc.
- 0.7.1 - improvements to completeness, bug fixes
- implemented flockfile, wprintf, and robust mutex functions.
- fixed stack corruption bug in times(), minor header bugs, and some
- error return value bugs in thread interfaces.
- 0.7.5 - new features, major optimization, and robustness
- implemented POSIX timers.
- optimized and simplified many thread-related functions.
- eliminated resource leak races in thread cancellation. (almost all
- existing implementations, including glibc, have these leaks.)
- overhauled stdio implementation to take advantage of readv/writev for
- reduced syscall load, and improved stdio's handling of error status.
- added syscall header and interface for applications to use and
- greatly simplified internal system for making syscalls.
- strangthened tmpnam/tempnam/tmpfile filename generation and made the
- straight C functions not depend on POSIX symbols.
- fixed pthread cancellation ABI on i386 to match the LSB/glibc ABI
- better double-free handling in malloc
- various minor bug fixes
- 0.7.6 - major bug fixes
- fixed rare but serious under-allocation bug in malloc.
- fixed signedness bug in strchr that prevented finding high bytes.
- fixed serious parsing bugs in strtold.
- fixed statvfs syscall (it was always failing with EINVAL).
- fixed race condition in set*id() functions with threads (possible
- deadlock). further audit still needed though.
- fseek no longer sets the stream error flag on failed seeks (this was
- wrong and broke some programs, notably GNU m4).
- nl_langinfo is no longer a dummy function. (the functionality was
- previously implemented but accidentally left unused).
- various small fixes have been made to the implementations and
- prototypes for nonstandard and obsolete functions
- 0.7.7 - more bug fixes and program-compatibility improvements
- fixed floating point formatting and rounding bugs in printf.
- fixed broken %N$ positional argument specifiers in printf.
- fixed misaligned read/overread bug in strchr which could lead to
- crashes scanning tiny strings at the end of a page when the next page
- is not readable, or on archs (not yet supported) that forbid
- misaligned reads.
- fixed breakage of statvfs on x86_64
- fixed crash in getmntent_r
- fixed bug in POSIX timers created with NULL sigevent argument
- improved semaphore performance, and sem_wait is now interruptable by
- signals, as required by POSIX.
- added many compatibility and system-level interfaces, increasing the
- proportion of busybox that works with musl.
- 0.7.8 - more bug fixes and compatibility improvements
- fixed problems with ipv6 dns and address printing code that made ipv6
- support practically unusable, and some other getaddrinfo bugs.
- fixed broken sendmsg/recvmsg functions on x86_64 (caused by incorrect
- msghdr structure).
- fixed broken sigsetjmp asm on x86_64.
- worked around a problem with input buffering on terminals reblocking
- after getting a blank line, due to a bug in the linux readv syscall.
- various improvements to the "rsyscall" system used to implement
- threaded setuid, setgid, etc.
- exiting/cancelling the a timer handler thread no longer kills the
- timer.
- fixed incorrect trailing zeros on some %g conversions in printf.
- fixed buggy byte-swapping functions and moved them to inlines in
- byteswap.h.
- many small improvements to header/application compatibility, support
- for nonstandard macros, etc.
- 0.7.9 release notes
- new pthread cancellation implementation:
- - safe against resource-leak/side-effect-leak race conditions
- - safe against interruption by signal handlers
- - reduced bloat in all cancellable functions
- - reduced bloat for blocking cancellation
- new interfaces implemented:
- - realpath (limited functionality)
- - wordexp (limited functionality)
- - flock (nonstandard)
- - forkpty (nonstandard)
- - posix_fadvise
- - posix_fallocate
- general bug fixes:
- - syslog function failure to communicate with syslogd
- - bug in siginfo_t definition if wait.h was included before signal.h
- - incorrect struct definitions for most of sysv ipc
- - pthread_exit/cancel on timer handler wrongly destroying the timer
- - linux dup2 ebusy workaround
- - obscure issues in non-threaded programs using some pthread functions
- - getopt_long allowed mismatch in last char of option name
- - incorrect parsing of obscure ip address forms
- - initgroups not working reliably (uninitialized var)
- - shadow pass treating empty expiry field as pass-expired-in-1970
- - bogus longjmp if pthread_exit was called from cancellation handlers
- x86_64-specific bug fixes:
- - fcntl file locking
- - thread stack alignment
- - broken select timeouts due to incorrect timeval definition
- 0.7.10 release notes
- new features:
- - ipv6 numeric string parsing
- - eventfd syscall wrappers
- optimizations:
- - new qsort implementation using the smoothsort algorithm
- - much smaller/faster sigset_t handling functions
- - lowered spin count before futex wait in synchronization functions
- general bug fixes:
- - incorrect floating point round-to-even behavior in printf
- - major bugs in pthread barrier implementation
- - off-by-one error in scanf %n results
- - scanf failure to report EOF when scanning for literal text
- - minor missing/incorrect prototype issues
- - dependency on undefined call order in fclose
- compiler issue workarounds:
- - incorrect inlining of variadic functions on recent gcc versions
- - pcc preprocessor bug with recursive macro expansion
- 0.7.11 release notes
- new features:
- - integrated dynamic linker
- - dynamic loading (dlopen/dlsym) (for dynamic-linked programs only)
- - XSI search.h API
- - POSIX message queues
- - POSIX spawn interfaces
- - BSD pseudo-random number generator API (random/srandom/initstate/etc.)
- - floating point environment (limited usefulness due to gcc bugs)
- general bug fixes:
- - possible crashes with wordexp due to uninitialized variable
- - race condition in pthread_kill (also present and unfixed in glibc/nptl)
- - pthread exit destructors called too late
- - dangerous unbounded vla in glob
- - brk/sbrk legacy functions mismatching legacy semantics
- - wcsncpy dest buffer overflow
- - strncat and wcsncat possible overflows due to double-termination
- 0.7.12 release notes
- new features:
- - support for textrels in shared objects
- - rpath support in dynamic linker
- - stdio_ext.h functions (for better gnu software compatibility)
- bug fixes:
- - some compilers miscompiling dlopen due to misuse of longjmp
- - safe handling of invalid long-double bit patterns (affects printf)
- - workaround for bugs in linux mprotect syscall
- - thread-safety for random() functions
- - various minor issues
- 0.8.0 release notes
- new features:
- - chinese and japanese legacy charset support in iconv
- - zero-syscall clock_gettime support (dynamic-linked x86_64 only)
- - futex-based locking for stdio (previously used spinlocks)
- - LD_PRELOAD and RTLD_NEXT support in dynamic linker
- - strptime (mostly working but incomplete)
- - posix aio (mostly working but not entirely conformant)
- - memory streams (fmemopen, open_memstream, ...)
- - stub/dummy implementations for various useless legacy functions
- - if_nameindex
- security hardening:
- - setuid, etc. should not longer be able to "partially fail" with threads
- - ensure suid programs start with fd 0,1,2 open
- - improved openpty/forkpty failure checks
- threads/synchronization bug fixes:
- - dangerous spurious wakeup in pthread_join lead to early return
- - race condition enabling async cancellation (delayed/lost cancellation)
- - destruction/unmapping race conditions in semaphores, mutexes, rwlocks
- - recursive rwlock_rdlock deadlock when a writer is waiting
- - race condition in sigqueue with fork
- - timer expiration thread exit wasn't running dtors
- - timer threads weren't blocking signals
- - close was wrongly cancellable after succeeding on some devices
- - robust mutex list was not reset on fork
- general bug fixes:
- - incorrect logic in fread (spurious blocking; crash on write-only files)
- - many corner cases and overflow cases for strtol-family functions
- - various printf integer formatting issues with flags/width/precision
- - incorrect iconv return value on failure
- - broken FD_* macros on 64-bit targets
- - clock function returning wrong value (real time not cpu time)
- - siglongjmp signal mask clobbering (off-by-one pointer error)
- - dynamic linker weak symbol resolution issues
- - fdopendir failure to set errno
- - various minor header fixes
- 0.8.1 release notes
- bug fixes:
- - mismatching prototypes caused build failure on 64-bit
- - other minor prototype errors in the headers have been fixed
- - various other small omissions fixed
- 0.8.2 release notes
- new features:
- - ptrace syscall support
- bug fixes:
- - const error (only a warning with many compilers) in lio_listio
- - minor portability fixes aimed at supporting new arch targets
- 0.8.3 release notes
- new features:
- - arm port (experimental)
- - better musl-gcc wrapper script for building against musl
- - added clone system call
- bug fixes:
- - numerous header file typos, copy/paste errors, omissions
- - statfs and statvfs ABI are now LSB-conformant (and actually work)
- 0.8.4 release notes
- new features:
- - arm dynamic linker support
- - process-shared pthread barriers now work
- - efficient futex-requeue-based cond var broadcast
- - more optional cancellation points are now cancellable
- - printf accepts null pointers with %s, prints as "(null)"
- - recursive mutexes are now fully reentrant
- - __cxa_atexit support
- - real vfork
- - dynamic linker now gold-compatible
- - prlimit syscall
- - support for large limits with setrlimit/getrlimit (even on 32-bit)
- - glob now supports GLOB_PERIOD option (GNU extension)
- bug fixes:
- - many serious issues in condition variables
- - rwlock failure-to-wake deadlock issues
- - various small header files bugs/omissions
- - wrong failure return for pthread_create
- - path handling issues on execvp
- - lock count corruption with robust recursive mutexes on owner death
- - integer overflows in atoi, etc. reading most-negative value
- - spurious mremaps on every realloc of large memory chunks
- - pthread cancellation failure in single-threaded programs
- security:
- - avoid fd_set overflow in dns lookups
- 0.8.5 release notes
- new features:
- - stdio operations are now cancellable (only when low-level io happens)
- - global ctor/dtor support in main program start code and shared libs
- - dynamic linker support for PIE executables (but missing startup code)
- - vfork support on x86_64
- - complete set of locale_t functions (all ignore the locale argument)
- - provide define float_t and double_t in math.h
- - lighter/faster cancellation cleanup handler register/unregister
- bug fixes:
- - gcc wrapper now supports -shared, -nostdlib, -nostartfiles
- - removed one wrongly-classified character from iswspace set (zwsp)
- - fixed crashes in dns lookup on some errors, e.g. resolv.conf missing
- - "make install" no longer tries to build shared libc if disabled
- - ptrace argument handling bugs fixed
- - work around visibility-hidden bugs in gcc 3.x
- - fix thread-pointer-loss issue when it's initialized in signal handlers
- - various minor typo/misc fixes in headers
- compatibility:
- - glob behaves more like traditional implementations w.r.t. GLOB_MARK
- - added legacy futimes, lutimes functions
- - more compatibility macros in sys/param.h (nonstandard header)
- - setfs[ug]id syscall wrappers (linux specific)
- - fgetpwent function (nonstandard)
- - utmp.h matches traditional version more closely
- - caddr_t now matches glibc type (void * instead of long)
- - dummy (always-fail) dlopen and dlsym functions for static linked programs
- - [efg]cvt functions (previously posix, removed from standard)
- - get_current_dir_name function (nonstandard)
- 0.8.6 release notes
- bug fixes:
- - fix crash in dns lookups for all static-linked, non-threaded programs
- 0.8.7 release notes
- new features:
- - c++ support with g++'s libstdc++
- - c99 math library (float, long double, complex, etc.)
- - numerous wchar_t functions
- - a64l, l64a functions
- - getdate function
- compatibility:
- - c89 compatibility in math.h
- - syscall.h alias for sys/syscall.h
- - memory.h alias for string.h
- - getcwd supports null buffer argument (auto-allocation)
- bug fixes:
- - major fenv (floating point environment) fixes and optimizations
- - strptime mishandling of day/month names
- - strtoull wrongly rejecting the highest 16 possible values as overflow
- - math.h constant expression fixes for INFINITY/NAN/etc.
- - scanf mishandling of "0" with "%x"
- 0.8.8 release notes
- new feature:
- - major math correctness and performance improvements
- - many math functions implemented in asm for i386
- - some math functions (mostly long double) in asm for x86_64
- - new floating point parser/converter with correct rounding
- - implement wcstod, wcstof, and wcstold
- - new scanf implementation - cleaner, faster, more correct
- - minimal/incomplete strfmon implementation
- compatibility:
- - header fixes for c++
- - regex code resync with TRE; support common regex extensions
- - support for compiling apps with gcc's -funsigned-char
- - sysconf now returns dynamic limits for open files, processes
- - give dlerror proper error status stickiness
- - make alloca work even with -fno-builtin
- critical security fixes:
- - stack-based buffer overflow in fprintf on unbuffered files
- other bug fixes:
- - rare gcc register allocation (miscompilation) bug in syscall wrappers
- - printf was rejecting the valid (but redundant) %lf format specifier
- - fixed big data bloat (missing const) in math functions
- - many math fixes related to floating point exceptions and rounding
- - corrected DECIMAL_DIG definitions
- - tgammal was wrongly setting global signgam
- - crash in wordfree with uninitialized we_offs
- - fix wordexp not null-initializing the we_offs initial slots
- 0.8.9 release notes
- bug fixes:
- - major breakage in strtol and family: failure to accept leading spaces
- - incorrect name for MATH_ERREXCEPT in math.h
- compatibility:
- - prototypes for a few additional nonstandard functions
- 0.8.10 release notes
- new features:
- - correct over/underflow detection (ERANGE setting) for strtod
- - new musl-gcc wrapper, specfile based, faster and more robust
- - meaningful return strings for dlerror
- - new iswalpha, iswpunct, and wcwidth; sync'd to Unicode 6.1
- - towupper/towlower sync'd with Unicode 6.1
- - new futex-based libc-internal locks instead of spinlocks
- - experimental stack protector support (minimal; no random canary)
- - experimental gdb shared library tracking support
- compatibility:
- - getusershell family functions
- - getresuid and getresgid syscall wrappers
- - byte swapping macros in endian.h
- - getdtablesize was wrongly declared in unistd.h for _XOPEN_SOURCE
- bug fixes:
- - iconv_open wrongly rejecting most dest charsets (broken in 0.8.0)
- - sysconf failure when correct value is -1 (broken in 0.8.8)
- - scanf and strtod family functions overreading past NAN (4 bytes vs 3)
- - scanf and strtod wrongly treating "0.00000000001", etc. as 0
- - many bugs in towupper/towlower (never seriously tested before)
- - int8_t definition was wrong when gcc -funsigned-char was used
- 0.9.0 release notes
- license change: MIT
- new features:
- - configure script, improved build system
- - full stack protector support
- - PIE support on x86 and x86_64
- - new O(1) space, O(nm) time implementation of fnmatch
- - improved support for sse2 floating point mode on x86
- compatibility:
- - added linux unshare syscall
- - exp10/pow10 function
- - sqrtl support on arm (previously missing)
- - removed minimal linux/*.h headers that could conflict with real ones
- - support for _LARGEFILE64_SOURCE (mapped to standard fcns with #define)
- - better c89 compatibility in headers
- - stub versions of sched_* functions (previously missing)
- - pthread stacks no longer executable (compat with hardened kernels)
- - new ar.h and lastlog.h (legacy junk)
- - various other header improvements
- optimization:
- - additional x86_64 math asm
- - better formula for acos use in i386 asm
- bug fixes:
- - large (up to a few %) errors in strtod for certain values due to bug
- - mbsnrtowcs and wcsnrtombs were completely broken (bad exit logic)
- - wide printf %.0s could fail due to uninitialized variable
- - missing dlerror strings for dlsym in some cases
- 0.9.1 release notes
- new features:
- - dynamic linker can be used as a program to explicitly load/run executables
- - ldd command, usable by making a symlink to the dynamic linker named ldd
- bug fixes:
- - major bugs in POSIX BRE parsing inherited from TRE regex code
- - character matching bug in regex on ARM: WCHAR_MAX was assumed to be signed
- - various obscure fixes related to signals and pthread cancellation
- - remquot subnormal remainder bug
- - buggy macros in (nonstandard) sys/param.h
- - major bug in pthread barriers on x86_64 (out of bounds write)
- - utimes (legacy) function was making wrong syscall (utime instead of utimes)
- - avoid using "old" syscalls that don't exist on arm eabi linux
- - broken strrchr(str, 0)
- - broken mbsinit(0)
- - broken wcsncmp
- - syntax error in nextafter macro in tgmath.h
- - missing support for -pie in musl-gcc wrapper
- - abort could wrongly fail to terminate the program in some cases
- compatibility:
- - increase default thread stack size to 80k
- - support _BSD_SOURCE feature test macro
- - support _LARGEFILE64_SOURCE feature test macro (merely exposes alt names)
- - lots of legacy-compatibility improvements in headers
- - various minor GNU extension functions
- - sysconf reporting number of available CPUs/cores
- - various LSB/glibc ABI interfaces aimed at compatibility with some binaries
- - use fistpll asm mnemonic instead of fistpq for compat with clang
- 0.9.2 release notes
- bug fixes:
- - pointer overflow in printf (crash on 32bit userspace, 64bit kernel)
- - printf %ls over-read bug
- - strtod failure to read -0x as negative zero
- - flush stdio after dtors, not before
- - wrong file position for buffered input streams on exit
- - popen was broken when stdin/out were already closed
- - broken wcwidth tables (missing many characters)
- - fwrite: wrong return value of partial/failed write
- - broken utf-16 conversions
- - bad buffer length check in getlogin_r
- - bad perror("") behavior; did not match perror(0)
- - broken sysinfo syscall/structure
- - stdint.h const macro signedness bugs
- - broken include guards in some headers
- - bogus localeconv values
- - cancellation-safety for popen and pclose
- - fma corner cases wrong on i386
- - fcntl F_GETOWN errno missing on failure.
- - char signedness bug in dynamic linker broke dlopen on arm
- - mprotect failure in dynamic linker caused crash instead of error
- build system:
- - configure check to work around hacked-up gcc versions
- - test for old binutils that can't support musl dynamic linker
- compatibility:
- - make _GNU_SOURCE imply _LARGEFILE64_SOURCE
- - syscall wrapper for lots of nonstandard and/or legacy linux syscalls
- - versionsort stub
- - timegm function (inverse of gmtime)
- - various minor header tweaks
- - make __freading/__fwriting semantics match traditional ones
- - added gnulib-compatibility stdio interfaces
- - added pthread_attr_setstack interface
- - make strerror_r return partial string when buffer is too small
- - duplocale should accept LC_GLOBAL_LOCALE
- - align ptsname_r to upcoming posix requirements
- - support invalid ld80 bit patterns as extra nans.
- 0.9.3 release notes
- new features:
- - mips (32-bit, o32 abi) port, currently static-linked only
- - newly overhauled crypt implementation
- - improved library pathname info for debugger from the dynamic linker
- - getaddrinfo (and getservbyname) now support /etc/services lookups
- - pipe2 syscall wrapper
- - splice and vmsplice syscall wrappers
- - syscall wrappers for extended attribute interfaces
- - ioperm/iopl syscall wrappers on archs that support these operations
- bug fixes:
- - dlsym RTLD_NEXT library search order was wrong
- - multiple dlopen pathname and library name handling errors
- - potential race condition in detached thread exit
- - broken internal-lock-handling code not updated for futex-based __lock
- - sem_trywait spurious EAGAIN errors arising from CAS failures
- - workaround kernel bug in cmsghdr size_t vs socklen_t issue (64-bit)
- - getservby* crash on null protocol argument
- - logic error skipping failed interfaces in if_nameindex
- - various minor header/declaration related issues
- arm-specific bug fixes:
- - broken crti/crtn startup code when gcc crtbegin/end files are linked
- - sigsetjmp tail call optimization failure broke the function
- - incorrect little-endian assumptions in atomic.h functions
- - use of blx instruction in asm (not supported on pre-v5 arm)
- build system:
- - only use expensive -ffloat-store cflag on archs/compilers that need it
- - make musl-gcc wrapper support -lgcc (mainly for self-hosting)
- 0.9.4 release notes
- new features:
- - blowfish crypt
- - dynamic linking on mips
- - arm hard float support
- - BSD fgetln function in stdio
- - minor header improvements for compatibility
- - support for CROSS_COMPILE variable to configure
- - legacy significand function
- - better support for SUSv3-targeted programs
- performance:
- - assembly (string ops based) memcpy for i386 and x86_64
- - reduce printf overhead
- bug fixes:
- - failure of strtod, etc. to process extremely long strings correctly
- - read overrun in wcsstr for short needles
- - various major mips issues that prevented most software from working
- - erroneous floating point exception behavior in i386/x86_64 exp asm
- - crashes on null arguments to legacy err.h functions
- - various header file/type issues
- - extremely rare/obscure race condition with robust mutexes
- - crypt now never returns null (most programs don't check, then crash)
- - missing xattr remove functions
- 0.9.5 release notes
- compatibility and headers:
- - POSIX+XSI+BSD features enabled by default with no macros defined
- - most programs can now be built without adding -D_GNU_SOURCE
- - added C99 restrict keyword where required in all prototypes
- - greater C89 compatibility
- - cleaner, more-compatible public syscall.h
- - many other header fixes
- - support for compiling musl with clang/llvm
- new features:
- - sha 256/512 password hash functions in crypt
- - GNU hash support in dynamic linker
- - partial C11 coverage
- - dladdr function added
- - dynamic linker reports all errors instead of exiting on first error
- - syscall wrappers added for most remaining linux syscalls
- - provide POSIX O_SEARCH open mode using linux O_PATH
- bug fixes:
- - most atexit functions were being skipped when exiting
- - some BSD functions were not being exposed under _BSD_SOURCE
- - issues loading ssp-protected DSO into non-ssp program with dlopen
- debloating:
- - eliminate .eh_frame (10-15% loaded size bloat)
- - optimal inline syscall asm for ARM and MIPS
- - no longer force -O3 for shared libs
- 0.9.6 release notes
- bug fixes:
- - serious breakage in definition of O_ACCMODE mask (missing a bit)
- new features:
- - O_EXEC open mode
- - md5 crypt hash function
- 0.9.7 release notes
- new features:
- - thread-local storage (__thread/_Thread_local)
- - microblaze port
- - getopt option parsing reset support
- - vsyscall (sysenter, etc.) support on i386 (faster syscalls)
- - memmem function (GNU extension)
- - mips fenv support
- - accept "nan(n-char-sequence)" in strtod/scanf family functions
- - configure now supports compiling with pcc
- quality and correctness improvements:
- - close-on-exec flag for all library-internal file descriptors
- - cancellation-safety and corner-case overhaul in shm_open/sem_open
- - close EINTR vs EINPROGRESS issue
- - mark binaries as not requiring executable stack
- - better gdb compatibility in dynamic linker
- - support recursive dlopen (dlopen called from constructors)
- - posix_spawn/system/popen no longer momentarily double commit charge
- - all stdio functions wait for locks
- bug fixes:
- - broken sysvipc *ctl functions on 64-bit archs
- - broken shmdt on some archs
- - getaddrinfo failure with port "0"
- - dirname handling of trailing slash
- - vfork race in posix_spawn
- 0.9.8 release notes
- new features:
- - powerpc port
- - dl_iterate_phdr interface
- - added mips-specific syscalls
- - thread priority scheduling
- - C11 CMPLX macro in complex.h
- - x86 port io functions in sys/io.h
- compatibility:
- - improved headers for trace/debugging/machine-access
- - stub functions for unsupported thread-related functionality
- bug fixes:
- - numerous math bugs (mostly exception flags and excess-precision issues)
- - register clobber error in i386 vsyscall asm (did not affect most callers)
- - various incorrect definitions in mips headers
- - broken dlsym asm on mips
- - empty prefix handling in configure script (--prefix="")
- - ldso search path logic issues
- - lock handling for stdio memory streams at exit time
- - invalid SO_REUSEPORT definition in socket.h (not supported by Linux)
- - broken redirection attempt to /dev/null in configure script
- 0.9.9 release notes
- new features:
- - tgamma implementation (no longer lgamma wrapper with low precision)
- - various gnu extensions: sigandset, sigorset, etc.
- - futimesat function (obsolete)
- - various linux syscalls: arch_prctl, personality, etc.
- optimizations:
- - hyperbolic, inverse hyperbolic, and inverse trig, bessel functions
- - is* comparison macros in math.h now expand inline properly
- library bugs fixed:
- - calling getenv from shared library ctors was broken
- - invalid read in mmap-serviced aligned_alloc/memalign (possible crash)
- - wrong errno result in fallback path of pipe2
- - various math functions raising spurious exceptions
- - mmap errno value on invalid offsets
- - backwards alignment logic in strlcpy
- - integer overflows in bessel functions
- - large (up to 60ulp) error in erfcf
- - dlsym/dlclose crashing on invalid library handles
- - failure to handle arch variations for cloexec/nonblock flags
- - lio_listio wrong return value for LIO_WAIT mode
- - dladdr failure to resolve PLT addresses
- - time_t/struct tm conversion off-by-one-day in december
- - malloc corruption on nonstandard kernels with non-page-aligned brk
- arch-specific bugs fixed:
- - arm ctors/dtors were not working with recent gcc versions
- - arm and mips setjmp/longjmp wrongly saved/restored fenv state
- - loss of precision in i386/x86_64 expl
- header bugs fixed:
- - incorrect PRI/SCN macros in inttypes.h for some types
- - arm sys/user.h regressions
- - failure of offsetof() to be an integer constant expression
- - tgmath return value type problems
- header compatibility improvements:
- - _GNU_SOURCE now enables everything; _ALL_SOURCE also works
- - scsi/scsi.h and scsi/sg.h are now provided
- - additional MAP_* flags for mmap
- - additional F_* commands and flags for fcntl
- - additional socket option, IPPROTO_* values, and multicase macros
- - thread-related waitpid flags
- - EHWPOISON added to errno.h
- - additional macros for mount, swap, and reboot operations
- - expose additional link.h structures
- - always ensure sizeof(NULL)==sizeof(void *), even in c++
- - additional flags for poll, epoll, inotify, timerfd, timex, dlfcn
- - register names in signal.h/ucontext.h for x86
- - ipc.h ipc_perm nonstandard struct field name compatibility improve
- 0.9.10 release notes
- new features:
- - getifaddrs
- - pthread_getattr_np (widely used by garbage collectors)
- - mkostemps, mkostemp, mkstemps functions (mkostemp is future-POSIX)
- - strcasestr and strverscmp (previously stubs)
- improvements:
- - major performance improvements in mbtowc
- - avoid filling caller-provided thread stacks with large TLS
- - debloat unnecessary static buffers
- - robust posix_spawn based on CLONE_VM instead of vfork
- - new system() and popen() based on posix_spawn
- - better strerror strings
- - further emulation of atomic close-on-exec/nonblock options for old kernels
- - provide macro constants for new-ish kernel features
- compatibility:
- - several nonstandard but widely-available pwd/grp/shadow functions
- - program_invocation_[short_]name
- - re-added useconds_t type used by some programs
- - some legacy arpa headers
- - dn_skipname function (legacy resolver API)
- - additional ABI aliases for supporting glibc-linked libraries/binaries
- general bugs fixed:
- - stale locks and bogus munmap call when pthread_create fails
- - uninitialized argument to munmap when dynlink load_library fails
- - incorrect error returns in gethostby*_r
- - memory leak in gethostbyname family
- - blank ai_canonname in getaddrinfo for non-CNAME records
- - undefined HZ macro in scsi/sg.h
- - wrong return value for wmemmove on forward-copy
- - namespace conformance in strings.h
- - various utmp.h bugs
- - unnecessary DT_SONAME in libc.so caused problems on some systems
- - multiple bugs in syslog, some possibly dangerous
- - non-functional setpriority function
- - slight mishandling of 0xf5 byte in UTF-8 decoder
- - misaligned memory accesses in mbsrtowcs
- arch-specific bugs fixed:
- - crash in shared library loading on arm
- - missing __aeabi_atexit needed by arm eabi
- - wrong float_t definition on x86_64
- - various low-impact type size/alignment mismatches in some headers
- - epoll struct alignment wrong on non-x86[_64] archs
- - broken pipe2 fallback code on mips with old kernels
- 0.9.11 release notes
- new features:
- - %m allocation modifier for scanf
- - week number and ISO week-based-year functionality in strftime
- - per-process and per-thread cputime clocks
- - ethernet address conversion interfaces
- - legacy classful ipv4 network address interfaces
- - minimal dlinfo function (nonstandard)
- other improvements:
- - dynamic linker path file can now use newlines to separate paths
- - math optimizations for archs with extended precision (i386)
- - musl-gcc wrapper now exposes gcc's intrinsic headers
- - quality of rand and rand_r pseudo-random sequences
- - support for large device minor numbers (greater than 8 bits)
- - various header conformance and compatibility fixes
- directly user-visible bugs fixed:
- - scanf losing characters on unbuffered streams and fmemopen streams
- - failure of mbsrtowcs to record stop position when dest is full
- - failure of iconv to convert to legacy codepages
- - non-working pthread_[sg]etschedparam functions (wrong syscall arguments)
- other potentially-serious bugs fixed:
- - resource leaks in sem_open
- - various bugs in thread exit synchronization
- - invalid access in aio notification after aiocb free/reuse
- - synchronization in dynamic linker when new thread dlopens during ctors
- - lack of error handling for failure to read dynamic linker path file
- - creation by mmap or shmget of objects larger than PTRDIFF_MAX
- minor conformance bugs fixed:
- - overflow handling for the clock function
- - workaround for incorrect exceptions in fma due to compiler bugs
- - workaround wrong kernel type for sem_nsems field in struct semid_ds
- arch-specific bugs fixed:
- - x86_64 sigsetjmp clobbered the signal mask rather than saving it
- - misaligned stack when calling ctors/dtors (crashing on x86_64)
- 0.9.12 release notes
- new features:
- - zoneinfo time zone support
- - PIE support on all supported archs
- - named sub-archs for endian and float ABI variants
- - improved support for non-root installs of the dynamic linker
- - ability to selectively build only performance-critical modules with -O3
- - simple buffer overflow detection in free/realloc
- - inet_ntop now presents v4-mapped addresses in ::ffff:a.b.c.d form
- - ldd now reports libc and the dynamic linker in its output
- compatibility:
- - support for new init/fini array (needed for ctors/dtors on newer gcc)
- - C++ ABI fully matches glibc/LSB, at least on x86
- - many added ABI compatibility symbols for using glibc-linked libs
- - support for STB_GNU_UNIQUE symbol bindings (found in some C++ libs)
- - macros/types for new Linux kernel features in headers
- bugs fixed:
- - crashes in scanf on literal mismatches (regression from adding %m)
- - dl_iterate_phdr was passing invalid phdr pointers to its callback
- - getaddrinfo with null host and AF_UNSPEC was failing to report IPv6
- - integer overflows in date/time conversion code
- - misinterpretation of pre-1930s dates as post-2038 on 32-bit archs
- - make install failed to install bits headers if make was not run first
- - shm_open was wrongly cancellable
- - low- or no-impact heap corruption in memalign
- - explicitly running the dynamic linker on PIE programs did not work
- - missing macros and sysconf for some supported POSIX option groups
- - missing close-on-exec flags for several internal fd uses
- arch-specific bugs:
- - wrong SIG_ATOMIC_MIN/MAX macros on x86_64
- - erfcl was missing on archs where long double is same as double
- - broken dynamic-model TLS in static-linked arm/mips/powerpc programs
- 0.9.13 release notes
- new features:
- - iconv support for EUC-KR and Big5 (including HKSCS) encodings
- - field widths (POSIX 2008 feature) in strftime
- - recursive rpath and $ORIGIN support in dynamic linker
- - cpu affinity interfaces
- - support for armhf (hardfloat) floating point environment (fenv)
- - support for SSE fenv on i386 (for apps using -mfpmath=sse -msse2)
- - strftime %s format (seconds since the epoch, future POSIX requirement)
- - configure script now saves its command line as a comment in config.mak
- - legacy functions valloc and euidaccess
- performance:
- - optimized asm memcpy for arm
- - optimized asm memset for i386 and x86_64
- - optimized C versions of memcpy and memset for all archs
- - eliminated major spurious syscalls from posix_spawn
- - some math asm for armhf (hardfloat)
- workarounds for:
- - qemu-user's rt_sigaction syscall does not allow old to alias new
- - qemu-user's madvise always succeeds (broke pthread_getattr_np)
- - passing PT_INTERP to dlopen attempted to double-load libc
- - gcc 4.8.x generating self-referential (infinite recursion) memcpy/memset
- - linux's lack of support for fchdir, fchmod, fchown, fstat on O_PATH fds
- bugs fixed:
- - failure to honor flags for fchmodat and faccessat (linux syscall api flaws)
- - SIGEV_THREAD timer id corruption and race condition issues
- - timer thread TLS incorrectly keeping values from previous expiry run
- - ecvt/fcvt decimal position off-by-one
- - in symbol-versioned libs, symbol resolved to oldest instead of newest
- - posix_spawn not correctly reporting errno from exec failure
- - "make install" was not atomic (overwrote files rather than replacing)
- - integer overflows in strftime
- - unset/empty TZ variable was mishandled
- - strftime could crash if the struct tm did not have valid tm_zone field
- - failure of fenv functions to handle invalid arguments (required by ISO C)
- - failure of some math functions (C and i386 asm) to raise underflow flag
- - broken dn_expand function (previously not used internally)
- - race conditions with signals during fork
- - incorrect access check in mktemp (obsolete function)
- - unnecessary arbitrary limits on size of program headers in dynamic loader
- - text formatting bugs in output of err.h functions
- arch-specific bugs:
- - fesetenv(FE_DFL_ENV) crashed on i386
- - breakage of arm crt code when libc is compiled as thumb
- - arm/armhf (hardfloat) misidentified by configure
- - ambiguity of wait (exit status) macros on mips with signal number 127
- - wrong value of _NSIG and SIGRTMAX on mips
- 0.9.14 release notes
- bugs fixed:
- - failure to properly install dynamic linker with DESTDIR set (symlink wrong)
- - rare deadlock in libc-internal locking routines
- - dynamic linker used fallback paths wrongly on (possibly transient) errors
- - popen broken when stdin or stdout was already closed in parent
- - deadlock/memory-corruption in multithreaded set*id and setrlimit functions
- - realpath failed when file was not readable
- - readpath mistakenly had cancellation points in it
- - crashes in scanf with invalid %m conversion specifiers
- - misclassificiation of some invalid ld80 float representation in fpclassify
- - various overflow and underflow flag issues in math functions
- - domain handling errors for acoshf and acoshl
- - wrong values for some sysconf properties
- - lack of proper memory barriers on arm
- mips-specific bugs:
- - broken sysv ipc structures
- - multiple stack-related bugs in clone, leading to crashes in parent or child
- - overflow writing sigset_t in multithreaded set*id and setrlimit functions
- other improvements:
- - size and performance improvements to various math functions
- - wait.h as a compatibility alias for sys/wait.h
- - various header improvements
- - support for runtime-variable page size on archs that need it (mainly mips)
- 0.9.15 release notes
- new features:
- - support for mixing IPv4 and v6 nameserver addresses in resolv.conf
- - RFC 3678 multicast structures/macros in netinet/in.h
- - putspent and fgetspent functions (shadow password API)
- - timef function (obsolete, removed in POSIX 2008)
- - fanotify syscalls (Linux-specific feature)
- - semtimedop syscall (Linux-specific sysvipc extension)
- - quotactl syscall and header (filesystem quotas support)
- - drem and finite functions (obsolete BSD functions)
- - getloadavg function (non-standard)
- - herror function (non-standard and obsolete)
- - libc.so now stores and prints its version information
- - expose constants for new Linux features including O_TMPFILE
- - implement FNM_LEADING_DIR option to fnmatch (GNU extension)
- - posix_close function (accepted for inclusion in next POSIX issue)
- bugs fixed:
- - buffer overflow in mbsrtowcs
- - clobbering of gr_name in getgrnam_r and getgrgid_r
- - execle ignoring the environment argument
- - setenv crash on malloc failure
- - out-of-bounds access in fnmatch with FNM_PATHNAME and certain patterns
- - failure of malloc to set errno when failing to extend heap
- - incorrect errno value from getcwd with zero size
- - spurious failure in faccessat with AT_EACCESS flag with suid/sgid programs
- - several fd leaks due to missing close-on-exec flag
- - misspellings/typos in macro names in several headers
- - incorrect failure return value in inet_pton
- - various numeric ip address parsing and validation fixes
- - namespace conformance issues in several headers
- - minor header issues
- - zombie processes left by faccessat with AT_EACCESS
- - timezone file parser failing/crashing on 64-bit archs
- - hang in localtime with near-overflowing time_t values on 64-bit archs
- - timezone path search was only trying first path
- - incorrect handling of excessive-length TZ environment strings
- - timezone file loading was wrongly enforcing O_NOFOLLOW/rejecting symlinks
- - iswspace was wrongly returning true for the null character
- - various bugs in wordexp
- - putgrent could write corrupt lines after write failures
- - dn_expand misinterpreted in-packet offsets greater than 255
- - spurious strftime/wcsftime failure on len+1==bufsize case
- - incorrect underflow flag in fma corner cases
- - log*(0) wrongly returned +inf in downward-rounding mode
- - failure of fchmod, fstat, fchdir, and fchown to produce EBADF
- arch-specific bugs fixed:
- - i386: failure of fesetround to set sse rounding mode
- - i386: floating point limit constants misinterpreted due to excess precision
- - powerpc: broken thread pointer access when compiled with clang
- - microblaze: dynamic linker entry point code possibly clobbering argv
- strict conformance issues:
- - NULL definition re-aligned with POSIX (requires (void *) cast)
- - alignment of math.h is* comparison functions with C11 annex F requirements
- 1.0.0 release notes
- new features:
- - support for mips softfloat ABI variant
- - legacy setkey and encrypt API for DES
- - support for BSD version of struct tcphdr in addition to GNU version
- - added ipv6 and icmpv6 protocol lookups to getprotoent-family functions
- new experimental ports:
- - sh (SuperH)
- - x32 (ILP32 ABI for x86_64)
- compatibility:
- - improved c89 compiler support in math.h
- - eliminate some compiler warnings in public headers
- - added some missing things for LFS64 APIs
- - added fallback emulation of accept4 for older kernels
- bugs fixed:
- - buffer overflow in printf when printing smallest denormal exactly
- - rounding errors in printf in some just-over-halfway cases
- - posix_spawn did not accept null pid pointer (crashed)
- - ftello gave incorrect result for unflushed append-mode streams
- - mishandling of n=0 case in wcsxfrm (wild buffer overrun)
- - possible system breakage during libc upgrade due to install.sh bugs
- - nftw FTW_MOUNT flag prevented walking any directories at all
- - ptsname/ptsname_r returned negated error codes
- - getprotoent function returned junk after listing valid protocols
- - wrong error code from readdir when the directory has been deleted
- - various prototype/argument-type fixes, mostly to legacy functions
- - various header namespace violations
- arch-specific bugs fixed:
- - fesetenv(FE_DFL_ENV) was broken on i386 and x86_64
- - strerror(EDQUOT) did not work on mips
- - recvmsg/sendmsg were broken on powerpc
- - sysv ipc was broken on powerpc and mips
- - statfs/statvfs were broken on mips
- - sigaltstack was broken on mips
- 1.1.0 release notes
- new features:
- - relro memory protection in dynamic linker
- - malloc can now extend heap with mmap if brk fails
- - vdso clock_gettime/gettimeofday/time acceleration on x86_64
- - thread/library-safe versions of search.h functions (nonstandard)
- - getauxval function (nonstandard)
- - sysconf extensions to query physical memory size
- bugs fixed:
- - floating point printf output corruption from carry into uninitialized slot
- - possible runaway carry overflow in printf floating point
- - printf %g failure to strip trailing zeros in some cases
- - search past end of haystack in memmem
- - off-by-one error in confstr return value
- - crashes in some near-empty static programs that use stack protector
- - deadlock race in pthread_once
- - non-working clock_gettime fallback for old kernels
- arch-specific bugs fixed:
- - crash from missing syscall asm register clobbers on real microblaze kernel
- - crash in all nontrivial dynamic linker use on microblaze
- - incorrect rlimit constants on mips
- - broken, possibly dangerous, use of getrlimit syscall on x32 in sysconf
- 1.1.1 release notes
- new features:
- - new options --preload and --library-path to dynamic linker
- - public execvpe function (nonstandard extension)
- - iconv support for cp437 and cp850
- bugs fixed:
- - false negatives with some periodic needles in strstr, wcsstr, and memmem
- - crash on invalid zoneinfo files
- - incorrect zero-padding of some outputs for strftime %s specifier
- - misreporting of errors in configure script when $CC does not work at all
- - treating not-yet-implemented strptime specifiers as errors
- compatibility:
- - configure now detects serious constant-folding bug in gcc 4.9.0
- - removed __yield symbol (unused) that clashed with some compilers
- - improvements to sysconf's handling of unsupported/invalid arguments
- arch-specific bugs fixed:
- - misdetection of superh ABI variant by configure on gcc 3.x
- - missing SO_RCVBUFFORCE and SO_SNDBUFFORCE in mips socket.h
- - build regression on armv6 and later with -mthumb
- 1.1.2 release notes
- new features:
- - multi-protocol matches (tcp and udp) in getaddrinfo
- - support for AI_V4MAPPED and AI_ALL flags to getaddrinfo
- - reverse name lookups from /etc/hosts
- - reverse service lookups from /etc/services
- - support for service aliases in /etc/services
- - ipsec and tunneling protocols to getprotoent-family functions
- - res_send, res_mkquery, res_querydomain, and dn_comp functions
- - ipv6 scope id handling for link-local scope addresses
- - previously-unimplemented %C and %y in strptime now work
- - vdso clock_gettime acceleration on i386 (new kernel feature)
- - better O_CLOEXEC/SOCK_CLOEXEC fallbacks for old kernels
- bugs fixed:
- - buffer overflow in dns response parsing (CVE-2014-3484)
- - possible infinite loop in dns response parsing
- - sendfile off_t 32/64-bit size mismatch
- - incorrect end pointer in some cases when wcsrtombs stops early
- - incorrect if_nametoindex return value when interface does not exist
- - dummy "ent" function aliases that possibly shadowed real ones
- - tmpfile fd leak on memory exhaustion
- - getaddrinfo returning EAI_NONAME for some transient failures
- arch-specific bugs fixed:
- - broken kernel side RLIM_INFINITY on mips
- - incorrect syscall argument 6/7 types for pselect on x32
- 1.1.3 release notes
- new features:
- - address sorting in getaddrinfo, etc. modeled on rfc 3484/6724
- - default timezone taken from /etc/localtime when $TZ is unset
- - getopt double-colon extension for optional arguments
- - support for TLSDESC-based (gnu2) TLS dialect on i386 and x86_64
- - sendmmsg/recvmmsg (linux-specific)
- - fmtmsg (last mandatory XSI function that was missing)
- compatibility:
- - treat dns rcode=2 as temporary failure, not negative result
- - working thread-pointer for pre-2.6 kernels on i386
- - further ABI-compat symbols: __xmknod[at], __sysv_signal
- bugs fixed:
- - memmem false positives/false negatives/crashes from invalid logic
- - gethostby*_r not setting result pointer to null on failure
- - aliasing violations in syscall.h SYSLOG_NAMES feature
- - fanotify_mark syscall arguments wrong
- arch-specific bugs fixed:
- - various subtle relocation bugs in powerpc and sh dynamic linker
- 1.1.4 release notes
- new features:
- - experimental locale support for LC_MESSAGES and LC_TIME
- - non-stub gettext family functions for message translation
- - or1k (OpenRISC 1000) port
- - syslog options LOG_CONS and LOG_PERROR
- - issetugid function (from OpenBSD)
- - improved if_nameindex and getifaddrs functions
- compatibility:
- - work around bug #61144 in gcc 4.9.0 and 4.9.1
- - support getauxval(AT_SECURE) even on kernels without AT_SECURE
- bugs fixed:
- - empty dynamic linker error messages (regression in 1.1.3)
- - if_nameindex omitted unconfigured and ipv6-only interfaces
- - incorrect return value for fwide function
- - failure of wide printf/scanf functions to set wide orientation
- - multiple issues in legacy function getpass
- - dynamic linker did not accept colon as a separator for LD_PRELOAD
- - errno clobber in syslog caused wrong output for %m specifier
- - crash in regexec for nonzero nmatch argument with REG_NOSUB
- - minor bugs in rarely-used nl_langinfo item lookups
- arch-specific bugs fixed:
- - broken relocations in mips dynamic linker (regression in 1.1.3)
- - register state corruption in setjmp asm for microblaze
- - broken struct stat st_ino field on microblaze
- - broken struct stat st_dev field on big endian mips
- - broken asm register constraints in atomics on powerpc
- - missing barriers in atomics on mips, powerpc, microblaze, and sh
- 1.1.5 release notes
- new features:
- - full C11 coverage (threads, UTF-16/32 API, timespec_get, etc.)
- - malloc_usable_size function (nonstandard)
- - support for new F_OFD_* fcntl operations (linux 3.15, POSIX-future)
- - new _DEFAULT_SOURCE feature test macro to request default profile
- performance:
- - private-futex support
- - redesigned cond var implementation with major performance improvement
- - tweaked spinning in userspace before performing futex waits
- bugs fixed:
- - failure of dn_expand to null-terminate name for crafted DNS packets
- - corruption of cond var mutex state when switching mutexes
- - use of uninitialized memory with application-provided thread stacks
- - false ownership of orphaned mutexes due to tid reuse
- - possible failure-to-wake for robust mutexes on owner death
- - subtle errors in robust mutex unrecoverable status handling
- - missing memory/compiler barrier spinning to obtain locks
- - wrong behavior in various zero-length stdio operations
- - buffer overflow in swab with odd argument
- - incorrect sequence generation in the rand48 family of prng functions
- - missing cancellation check in non-wait paths of sem_wait, pthread_join
- - missing barrier in pthread_once fast path
- - memory leak in regexec when input contains illegal sequence
- - various parser bugs in regcomp
- - wrong return value on overflow in some strtoul-family functions
- - broken CPU_EQUAL macro in sched.h
- - dlerror not working in static-linked programs
- - mishandling of negative non-whole-hour TZ offsets
- - incorrect case mappings for U+00DF
- - namespace pollution via accidentally-non-static function named "dummy"
- - missing __fpclassifyl and __signbitl definitions for ld64 archs
- 1.1.6 release notes
- new features:
- - getopt '-' flag for processing non-option arguments
- - getopt_long argument permutation extension
- - getopt_long abbreviated options
- - ns_parserr and related DNS-packet-parsing functions
- - fnmatch FNM_CASEFOLD extension
- - support for translation of getopt error messages
- - login_tty function (legacy)
- performance:
- - efficient atomics on armv7+ targets
- - pthread_once shrink-wrapping of fast path
- compatibility:
- - baseline arm binaries now work on new cpus/kernels without kuser_helper
- - dynamic linker now honors DT_RUNPATH without DT_RPATH (new binutils)
- - arm asm is now compatible with clang's internal assembler
- - suppress macro implementations of functions when headers are used in C++
- - increased message length limit for syslog
- bugs fixed:
- - open ignored file creation mode argument for O_TMPFILE
- - wrong printf formatting for %#.0o with value zero
- - missing private state for uchar.h functions (null ps pointer)
- - sched_getaffinity left uninitialized data in output bit array
- - wrong return values for pthread_getaffinity_np and pthread_setaffinity_np
- - buggy handling of multibyte option chars with arguments in getopt
- - printf failed to report or stop on write errors
- - printf failed to honor '+' modifier when printing NANs
- - wcsnrtombs returned the wrong value in one code path
- - syslog failed to check for connect error
- - multi-threaded set*id() had spurious failures from ugly workaround code
- - various minor header conformance bugs (signedness, constant expressions, ...)
- arch-specific bugs fixed:
- - on or1k, some syscalls with 64-bit arguments were broken (misaligned)
- - usage of sahf instruction on x86_64 crashed on some early cpu models
- 1.1.7 release notes
- new features:
- - alternate passwd/group backend support via nscd protocol
- - masked cancellation mode extension (experimental)
- - aio cancellation
- - aarch64 port (experimental)
- performance:
- - significant memset asm optimizations on i386 and x86_64
- compatibility:
- - suppress EINTR in semaphores for old kernels where futex restart is broken
- - always set optarg in getopt_long
- - support SOCK_RAW socket type in getaddrinfo
- - report success instead of EINPROGRESS when close is interrupted
- bugs fixed:
- - multithreaded set*id() was not async-signal safe, had various race bugs
- - getspnam_r returned results for partial username matches
- - wordexp bad character checker mis-counted parentheses
- - close on fd with pending aio could lead to file corruption
- - old aio implementation had numerous conformance bugs
- - malloc init code could deadlock due to race condition
- - pthread_exit did not disable cancellation
- - pthread_cond_wait could wrongly consume signal on cancellation
- - execvp wrongly stopped path search on EACCESS
- - fsync, fdatasync, and msync were not honored as cancellation points
- - fchmodat was subject to fd leak race (missing O_CLOEXEC)
- - fchmodat failed to report EOPNOTSUPP in race path
- - passwd/group lookup functions had various minor error-reporting bugs
- - isatty had false-positives/device-state-corruption for OSS sound devices
- - configure script failed to detect gcc with translated messages
- - FLT_ROUNDS macro failed to reflect rounding mode changes in fenv
- arch-specific bugs fixed:
- - mips fesetenv did not handle FE_DFL_ENV
- - mips POLLWRNORM and POLLWRBAND macros had wrong values
- - x32 pthread synchronization object type definitions were wrong
- - powerpc minimum signal stack size was insufficient
- 1.1.8 release notes
- bugs fixed:
- - stack-based buffer overflow in inet_pton (CVE-2015-1817)
- - regcomp crash/mem-corruption with illegal bytes after backslash
- - regcomp wrongly allowed backrefs in ER
- - regcomp miscompiled character class brace-repetitions
- - regcomp wrongly processed \0 as an unmatchable backref
- - new FLT_ROUNDS definition failed to work in C++ code
- arch-specific bugs fixed:
- - aarch64 was missing max_align_t definition
- 1.1.9 release notes
- new features:
- - ability to protect libc code itself with stack protector
- - sigsetjmp now restores signal mask after restoring context, not before
- - thread-local dlerror status/messages
- - dlerror messages are no longer truncated
- - diagnostics for constraint violations with ctype.h macros
- optimizations:
- - reduce cost of PIC on archs where PLT calls need a fixed GOT register
- - spin locks no longer constantly invalidate cache lines while spinning
- - code size reduction in static-linked TLS init
- bugs fixed:
- - failure to process robust mutexes on detached-thread exit
- - possible memory corruption due to robust mutex list on detached-thread exit
- - crash on memory exhaustion in getgr* internals
- - misaligned memory accesses in static binaries with low-alignment TLS blocks
- - multiple cases of wrongful path search continuation after transient failure
- - small memory leak on failure of dlopen with RPATH $ORIGIN
- - several small math bugs related to exception flags with non-finite args
- - mmap leak in sem_open failure path for link call
- - duplocale clobbered new locale struct with memcpy of old
- - futimes crashed with null timeval argument
- arch-specific bugs fixed:
- - stack protector spuriously aborted after forking on x32
- - stack protector spuriously aborted with flockfile on powerpc
- - theoretically-possible clobbering of syscall return value on mips
- - random thread-pointer setup failure on sh (uninitialized return value)
- - possible crash in dlsym on sh due to incorrectly-computed branch target
- - broken fesetenv(FE_DFL_ENV) on mips
- - dynamic linker name for sh ignored fpu/nofpu and endianness
- - various minor aarch64 bugs
- - dangling pointers in x32 syscall timespec fixup code
- 1.1.10 release notes
- new features:
- - fail-safe (allocation-free) C locale for newlocale to return
- - all locale categories track requested locale name
- - rcrt1.o start file for static PIE
- optimizations:
- - inline atomics for sh4a
- - removed heavy atomics from locale-related code paths
- - removed global data accesses from CURRENT_LOCALE macro & callers
- - dynamic linker stage 1 size reduction
- compatibility:
- - better configure detection of unsupported compiler options
- - support for more relocation types in libc.so, not currently used
- - iconv_open accepts "" and "CHAR" as aliases for native (UTF-8)
- - additional LFS64 macros in sys/resource.h
- regressions fixed:
- - dynamic linker crash on NONE-type relocations (only mips affected)
- - inability to build as thumb2 on arm
- - failure to run under qemu-i386 user-level emulation
- - inability to access globals from libc on powerpc
- - PIE link errors in Scrt1.o under unusual usage on some archs
- other bugs fixed:
- - failure of ungetc/ungetwc to work on FILE streams in EOF state
- - possible null pointer dereference in gettext
- - possible initial stack misalignment on mips with PIE
- 1.1.11 release notes
- new features:
- - byte-based C locale
- - vdso clock_gettime on arm
- - musl-clang wrapper
- - sh2 nommu target support
- performance:
- - major speed-up for dynamic linker symbol lookups with GNU hash
- compatibility:
- - strverscmp now matches GNU behavior in corner cases
- - empty TZ environment variable gives GMT rather than system default
- - reconnection on syslog server socket loss (syslogd restart)
- - mmap fallback in simple_malloc when brk fails
- - support for %m and %s with null pointers in wide printf variants
- - call frame information in i386 asm for improved debugger support
- bugs fixed:
- - spurious errors from pwd/grp functions when nscd backend is absent
- - possible invalid access on calloc with simple_malloc
- - null pointer dereferences after calling uselocale((locale_t)0)
- - erroneous support for cancellation in stdio caused data loss
- - inconsistent handling of atexit called from atexit handler
- - missing locking in error paths for ungetwc
- - btowc mishandling of out-of-range non-EOF inputs
- - negated return value of ns_skiprr, failure in related functions
- - incorrect void return type for syncfs, missing error status
- - possible failure of tempnam due to missing null termination
- - negated tm_gmtoff field in struct tm
- - off-by-one error in getsubopt leaving equals sign in value result
- arch-specific bugs fixed:
- - soft deadlocks on i386/x86_64 due to missing barrier in internal locks
- - regression in arm pre-v7 support for kernels with kuser helper removed
- - runaway PC on mips detached thread exit (due to kernel regression)
- - mismatched ABI for local-dynamic model TLS on mips and powerpc
- - incorrect value of some SO_* constants on mips
- - broken 64-bit syscall argument passing on aarch64
- 1.1.12 release notes
- new features:
- - fdpic abi on sh2 for shareable text segment without mmu
- - general fdpic elf support in dynamic linker
- - CFI generation for x86_64 asm source files
- - protection against silently building a libc.so with missing symbols
- compatibility:
- - nl_langinfo(CODESET) now returns "ASCII" in byte-based C locale
- - fixed build regression due to buggy .SECONDARY in some GNU make versions
- - additional arm eabi functions needed by llvm arm backend
- - added format argument attributes to gettext function prototypes
- - static PIE no longer requires linking with -E/-rdynamic
- - eliminated spurious protected-data warnings linking against libc.so
- - avoided spurious fpu asm errors with some armhf toolchains
- bugs fixed:
- - fclose of stdin/stdout caused deadlock at exit
- - missing memory barrier in pthread_join
- - open_[w]memstream produced no buffer when no writes took place
- - uninitialized scopeid in address lookups from hosts file and ip literals
- - ip literals for mismatching family (v4 vs v6) were queried as hostnames
- - possible crash on OOM in regcomp
- - incorrect contents in localeconv structure (-1 instead of CHAR_MAX)
- - strftime mishandling of out-of-range struct tm members
- - wrongful attribute((const)) on pthread_self and errno location function
- arch-specific bugs fixed:
- - arm crt1 entry point failed to align stack pointer in some cases
- - mips fesetround failed to actually set rounding mode
- - i386 asm source CFI generation had multiple bugs
- 1.1.13 release notes
- new features:
- - out-of-tree builds
- - search domains in resolv.conf
- - sh arch supports j-core (j2) cas.l atomics
- - dynamic linker includes arch/abi in output when run as a command
- - header support for new kernel features through linux 4.4
- - mips vdso clock_gettime support
- - regex BRE extensions: \|, \+, \?
- performance:
- - improved atomics performance on all archs with ll/sc model
- - atomic instructions are now inlined on armv6
- - use fpu sqrt for arm softfp abi on targets with vfp
- compatibility:
- - getnameinfo now accepts sockaddr sizes larger than needed
- - new default CFLAGS/LDFLAGS avoid entire classes of toolchain bugs
- - explicit use of float_t/double_t avoids compiler float spill bugs
- - i386 max_align_t definition now works with g++ 4.7's pseudo-c++11
- - all known protocols are added to protoent functions
- - stub utmpname, utmpxname functions
- - linker support for -Bsymbolic-functions is no longer mandatory
- - regex parsing size limits increased
- - malloc_usable_size now accepts null pointer input
- bugs fixed:
- - potential single-byte heap overflow in getdelim
- - mishandling of transient failure opening hosts, services, resolv.conf
- - mremap was sometimes able to allocate objects larger than PTRDIFF_MAX
- - nl_langinfo wrongly returned NULL instead of "" for invalid items
- - out-of-bounds dynamic tls allocation due to pointer/index scaling error
- - getifaddrs misreported point-to-point interface addresses
- - tdelete left tsearch trees misbalanced
- - tsearch crashed on allocation failure
- - tsearch, tfind, and tdelete failed to handle null pointer input
- - passing signal number 0 to sigaction resulted in a crash
- - getdelim updated caller's size wrongly when realloc failed
- - getdelim realloc strategy was wasteful
- - if_nametoindex returned wrong value on failure
- - missing ssp-suppression for some source files called from early-init
- - various minor resolv.conf parsing bugs
- - fwrite wrongly reported success on write errors in line-buffered flush
- - fwrite and fread wrongly returned nmemb (not 0) when size was 0
- nommu-specific bugs fix:
- - failure to zero bss in FDPIC shared library loader
- - unsafe writes to read-only file mapping in non-FDPIC library loader
- arch-specific bugs fixed:
- - sh[eb]-nofpu-fdpic was using fpu-dependent setjmp/longjmp variants
- - dynamic linker path file name was wrong for arm "softfp" targets
- - mips siginfo_t and related macros were defined incorrectly
- - possibly misaligned pointer globals on arm (from an asm source file)
- - mips dynamic linker failed to provide info needed by debugger
- - mips cancellation asm wrongly assumed validity of $gp register value
- 1.1.14 release notes
- regressions fixed:
- - treatment of empty string argument as error by puts and fputs
- - make clean and distclean failure in unconfigured trees
- - sh/fdpic dynamic linker entry point hang due to wrong code
- - armhf (and arm softfp model) build failure with clang
- other bugs fixed:
- - wrongly clamping (rather than failing) excessive rounds in crypt-sha*
- 1.1.15 release notes
- new features:
- - mips64 (full 64-bit and n32) port
- - mips r6 isa support (subarch for mips, mips64, and mipsn32 archs)
- - powerpc64 port
- - powerpc (32-bit) soft-float ABI support (subarch)
- - pthread_tryjoin_np and pthread_timedjoin_np (nonstandard extensions)
- - header-level support for linux 4.5 and 4.6 features
- - sched_getcpu (nonstandard extension) support, including vdso version
- - __STDC_ISO_10646__, __STDC_IEC_559__ macros predefined via stdc-predef.h
- - support for new elf/arch features in elf.h
- compatibility:
- - configure now correctly chooses cross-prefix based on build/host/target
- - abort now successfully terminates pid 1 in a container (or top-level)
- bugs fixed:
- - memmem read past end of haystack, possible false positives or crashes
- - buffer underflow (reverse-overflow) in ungetwc
- - double-free under certain usage of putenv
- - incorrect treatment by regcomp of * at start of BRE subexpression
- - gethostbyname[2][_r] produced ip addresses in misaligned buffers
- - looking up some invalid hostnames caused malformed dns queries
- - lookups from hosts file were inconsistent with non-matching family
- - missing h_length value in gethostbyaddr results
- - a64l function produced wrong-signed results on 64-bit archs
- - broken padding of string formats to width in wide printf variants
- - wrong results for expf(-NAN) and exp2f(-NAN)
- - wrong value for RUSAGE_CHILDREN prevented it from working
- - abort failed to provide abnormal termination with SIGABRT blocked
- arch-specific bugs fixed:
- - broken posix_fadvise on arm and powerpc (32-bit)
- - thread structure/dtv corruption on powerpc at thread startup
- - various wrong mips and powerpc ioctl and termios constant values
- 1.1.16 release notes
- new features:
- - s390x (64-bit S/390) port
- - pthread_setname_np extension function
- - limited pthread_setattr_default_np function to set stack size defaults
- - header-level support for linux 4.7, 4.8, and 4.9 features
- - confstr _CS_V6_ENV and _CS_V7_ENV items
- compatibility:
- - public prototypes for abi-compat *_unlocked symbols, etc.
- - fflush_unlocked(NULL) now works
- - resolv.h __RES version macro now matches supported APIs
- - workaround for gdb bugs backtracing across signals on x86_64
- - anchors ^ and $ are now accepted in BRE subexpressions
- - building for thumb2-only arm isa levels is now possible
- bugs fixed:
- - integer overflows in regexec buffer allocation (CVE-2016-8859)
- - failure of regexec to report matches at offsets past INT_MAX
- - static-pie executables with initialized thread-local storage crashed
- - printf failed to catch EOVERFLOW in some cases, wrongly produced it in others
- - printf produced wrong output, result for float with precision near INT_MAX
- - printf produced wrong results with alt-form octal, zero flag, & field width
- - printf float rounding was wrong for some midpoint cases
- - swprintf printed junk after internal (256-byte) buffer filled up
- - strtod family rounded incorrectly in several corner cases
- - getmntent failed to handle long records
- - getopt_long_only wrongly treated "--" as an option
- - asctime output wrongly varied by locale
- - strftime %y specifier produced wrong output for negative tm_year
- - time zone names quoted with <> were misparsed
- - corner case integer overflow in tm_year for some date conversions
- - failure to load shared libs whose names were prefixes of standard lib names
- - wrong error codes for several failure cases in various functions
- - various asymptomatic undefined behavior
- - various minor namespace issues in headers
- arch-specific bugs fixed:
- - tcsetattr regression on mips (completely non-working)
- - wrong pread/pwrite syscall calling convention on sh
- - wrong preadv2/pwritev2 syscall numbers on x32
- - mrand48/jrand48 produced wrong-signedness results on 64-bit archs
- 1.1.17 release notes
- new features:
- - RTLD_LAZY deferred symbol binding, functionally equivalent to lazy binding
- - safeguard against dlopen of multiple libc versions/instances
- - new posix_spawn flag POSIX_SPAWN_SETSID
- - posix_spawnattr_setflags now reports unknown flags as error
- - ldso option --argv0 to set argv[0]
- - added _NL_LOCALE_NAME extension to nl_langinfo
- compatibility:
- - dlopen local-to-global promotion no longer changes existing symbols
- - gettext now searches locale name variants for translation files
- - increased locale name length limit from 15 to 23 bytes
- - setlocale(LC_ALL, 0) returns single name if all categories are same
- - realloc no longer fails when mremap doesn't work
- - getservby* no longer treat numeric port strings as service records
- - mmap now works around incorrect EPERM error codes from kernel
- - impact of REG_* namespace pollution in x86[_64] signal.h is reduced
- - arm atomic asm now assembles correctly with new binutils
- - PAGE_SIZE on arm is no longer constant (quiet upstream ABI relaxation)
- - lsearch/lfind now pass args to compare callback in canonical order
- - STB_WEAK and STB_GNU_UNIQUE symbols now behave same as STB_GLOBAL
- - better clang CFLAGS checks in configure
- - global vis.h hack, which made lld refuse to link to libc.so, is disabled
- performance:
- - single-instruction optimized math functions for aarch64, s390x, powerpc64
- - fast path for ASCII in towupper/towlower
- - new mostly-integer-math fma function
- semantic bugs fixed:
- - POSIX-format TZ dst time transitions were wrong for southern hemisphere
- - regex REG_NEWLINE semantics were wrong with negated brackets
- - various bugs in strptime %j, %p, %C formats
- - iconv mapped some characters to legacy 8bit encodings incorrectly
- - glob failed to match "/"
- - UTF-8 decoder accepted invalid f4 9x xx xx code sequences
- - scanf %% conversion failed to consume whitespace
- - glob with GLOB_PERIOD wrongly descended into . and ..
- - nftw gave incorrect base name offset when pathname ends in "/"
- - functional regression in resolv.conf attempts option
- - scalbn could produce wrong result due to double rounding in subnormal range
- - strftime %y format wrong with negative years
- - mbsnrtowcs and wcsnrtombs mishandled input limits
- - minor issues with error codes for various functions
- safety/consistency bugs fixed:
- - stack-based buffer overflow in dns response processing
- - invalid free in regexec on certain error paths
- - invalid free in globfree after failed glob
- - one-byte buffer overflow in legacy getpass function
- - failed dlopen corrupted thread-local storage module list
- - race in pthread_create with priority attributes could leave signals masked
- - multithreaded set*id() functions could induce spurious EINTRs
- - dl_iterate_phdr reported wrong base address in static PIE
- - fd leak and wrong cancellation state after dns socket failure
- - memory leaks and other issues in environment-modification functions
- - read-after-free race in pthread_detach
- - memmem performed single-byte over-read in short-needle code paths
- - read via uninitialized pointer in gettext core
- - bindtextdomain broke bindings for all other domains
- - various silent undefined behavior
- - getopt clobbered optopt on success
- arch-specific bugs fixed:
- - x32 dynamic TLS accesses crashed
- - s390x was missing dlsym entry point (needed for RTLD_NEXT)
- - powerpc64 ldso startup could crash depending on link order
- - powerpc64 setjmp/longjmp didn't properly save/restore TOC pointer
- - thumb2 setjmp/longjmp silently broke at ld-time with text not aligned
- - fchown was broken on archs without SYS_fchown syscall
- - fstatat was broken on mips64
- - various incorrect constants in powerpc64 and mips headers
- 1.1.18 release notes
- regression fixes:
- - glob failed to match literal . and .. path components
- - build for armv4t ISA level was broken
- other bug fixes:
- - stack overflow in posix_spawnp with large PATH variable in environment
- 1.1.19 release notes
- new features:
- - iconv framework for processing stateful encodings
- - iconv support for iso-2022-jp
- - iconv support for converting to legacy JIS-based Japanese encodings
- - iconv support for UTF-16/32 with BOM-determined endianness
- - iconv ibm1047 (ebcdic latin1-equivalent) support
- - iconv cp866 (dos cyrillic) support
- - character data tables & case mappings updated to Unicode 10.0
- - fopencookie stdio extension
- - strftime padding character extensions
- - header-level support for new linux features through 4.13
- compatibility:
- - UTC timezone is now called UTC instead of GMT
- - _DIRENT_HAVE_D_* macros in dirent.h
- - dladdr dli_fbase definition now matches other implementations
- - pthread_getattr_np now reports guard size
- - strftime '+' modifier better matches apparent intent of POSIX
- - getopt_long handles long option names containing '='
- - better compatibility with linux uapi headers
- - workaround linux bug where getcwd can return non-absolute pathname
- - configure logic for finding compiler_rt with clang
- - execvp path search now continues after ENOTDIR components
- bugs fixed:
- - fgetwc failed when character crossed buffer boundary
- - memory corruption after failing to dlopen a second libc
- - sysconf reported infinite rlimits incorrectly
- - getopt_long --opt=arg did not work with partial matches
- - printf was wrong for alt-form octal with value 0, no explicit precision
- - endian errors in arpa/nameser.h and netinet/icmp6.h (missing endian.h)
- - atfork handler could clobber fork's errno
- - iconv could wrongly output surrogate pairs in ucs2
- - fmemopen buffer underallocation with extreme size argument
- - getaddrinfo AI_NUMERICSERV wrong error code
- - data race in at_quick_exit
- - ldd failed to honor rpath $ORIGIN for program in . without "./" prefix
- arch-specfic bugs fixed:
- - x32 unistd.h wrongly reported LP64 instead of ILP32
- - aarch64 signal.h had wrong type for ucontext_t uc_link member
- 1.1.20 release notes
- new features:
- - m68k port
- - replacement of malloc is now allowed/supported
- - setvbuf now accepts caller-provided buffers for stdio streams
- - getrandom syscall wrapper, getentropy function
- - mlock2 syscall wrapper
- - memfd_create syscall wrapper
- - explicit_bzero function
- - header-level support for new linux features through 4.17
- - wcsftime now supports padding specifier extensions
- - dynamic linker's reclaim_gaps now works on fdpic archs
- - getaddrinfo now honors AI_ADDRCONFIG
- - pthread_attr_init now honors pthread_setattr_default_np defaults
- hardening:
- - prevent bypass of guarantee that suids start with fd 0/1/2 open
- - dlopen now rejects libraries with initial-exec refs to dynamic TLS
- compatibility:
- - elf.h: new flags, aux vector entry types, etc.
- - minor namespace issues in several headers
- - intNN_t types used in bitfields now safe against -funsigned-bitfields
- - complex arc trig/hyperbolic functions were badly broken
- - nice function returned wrong value
- - stdio locks no longer depend on read-after-free not faulting
- - avoid excessive stack usage in getcwd
- - inet_ntop no longer compresses single zeros in IPv6 (RFC 5952)
- - resolver routability probe for sorting results works on no-IPv6 systems
- - added missing ST_RELATIME definition to statvfs.h
- - uchar.h now works with old C++ profiles
- - added missing and arch-specific commands to ptrace.h
- - musl-gcc wrapper now works with default-pie host toolchains
- bugs fixed:
- - getopt wrongly treating colons in optstring as valid option chars
- - nl_langinfo_l(CODESET, loc) reported wrong locale's value
- - out-of-tree build produced broken crt files with stack protector enabled
- - fmaf produced wrong result for some corner cases
- - out of bounds write for zero length buffer passed to gethostname
- - getopt_long_only wrongly prefix-matched long-options over short ones
- - pthread_kill wrongly returned ESRCH for exited by valid pthread_t's
- - iconv buffer overflow converting to legacy JIS-based encodings
- - iconv conversion to "UTF-32" (no explicit endianness) failed (regression)
- - iconv mishandled big5-hkscs characters that map to two unicode chars
- - dynamic linker didn't map/clear bss for libraries with single LOAD segment
- - resolver wrongly duplicated trailing dot from query into canonical name
- - some futex waits omitted timeout arg to syscall, thereby spun on EFAULT
- - dladdr mishandled addresses not matching symbols
- - alignment of dirent structures from readdir was broken (regression)
- - strftime %z output wrong sign for offsets <1 hour west of UTC
- - limits.h, pathconf erroneously defined SYMLINK_MAX
- - FP_ILOGB0 and FP_ILOGBNAN definitions were not valid for use in #if
- - getopt failed to update optarg and optind correctly on missing argument
- - EMULTIHOP error lacked strerror text
- - mktime malfunctioned with tm_isdst>0 but no-DST POSIX-format time zone
- - async thread self-cancellation produced a deadlock condition
- - pthread_barrierattr_setpshared failed to produce EINVAL for bad argument
- - fileno failed to produce EBADF for non-fd-associated FILEs
- - fmemopen's w+ mode failed to truncate buffer at open
- - open_[w]memstream did not bind stream orientation at open time
- - system wrongly returned 0x7f00 instead of -1 on error
- - wide printf functions ignored field width for %c formats
- - fprintf failed to set stream orientation for unbuffered stream or no output
- - psignal, psiginfo, and perror wrongly set stream orientation for stderr
- - psignal, psiginfo potentially clobbered errno on success
- arch-specfic bugs fixed:
- - on arm/aarch64/sh, local-exec TLS layout mismatched ABI with large align
- - on arm/microblaze/sh, struct ipc_perm mismatched (buggy) kernel ABI
- - SO_PEERSEC definition was wrong on mips
- - on mips, return from start function passed to clone crashed (runaway exec)
- - printf %a precision specifier malfunctioned except on ld80 archs
- - async thread cancellation crashed on powerpc64 and sh-fdpic
- 1.1.21 release notes
- new features:
- - setting default thread stack size via PT_GNU_STACK program header
- - arm vfork implementation
- - arm tlsdesc/gnu2 tls dialect support
- - name_to_handle_at and name_to_handle_at syscall wrappers
- - header-level support for new linux features through 4.18
- optimizations:
- - glob rewrite with much better performance and stack usage properties
- - single-threaded and already-locked fast paths for getc/putc variants
- - single-instruction fma implementations for arm, s390x, powerpc, & x86_64
- - single-instruction fabs and sqrt implementations for powerpc
- - size and performance from making all internal-only functions/data hidden
- - made &errno and pthread_self results cachable again (attribute((const)))
- - significant speedup in strtod with short inputs
- - new tsearch AVL tree implementation, smaller and faster
- - special-cased nop calls to wmemmove
- - fixed erroneously suboptimal skip conditions in strstr and memmem
- hardening:
- - default thread stack guard size increased from 4k to 8k
- compatibility:
- - default thread stack size increased from 80k to 128k
- - building for arm as thumb2 with clang internal assembler now works
- - aio threads could overflow stack on kernels that break MINSIGSTKSZ ABI
- - aio threads no longer call malloc (problematic with malloc replacement)
- - pthread_sigmask/sigprocmask now ignore an invalid how when not changing mask
- bugs fixed:
- - soft deadlock regression in stdio FILE locks with >2 threads contending
- - deadlock and buffered data loss race in fclose
- - race condition leading to possible crash in dcngettext plural forms
- - glob failed to see past searchable-but-unreadable path components
- - getdelim wrongly realloc'd buffer that was already exactly right size
- - getdelim failed to set stream orientation on early error
- - ttyname[_r] reported wrong error when given bad fd
- - pthread_key_delete left old tsd values exposed if slot was reused
- - freeaddrinfo failed to support freeing sublists
- - access to optopt was broken by copy relocations
- - memccpy returned wrong result if first byte past buffer end matched
- - wordexp read past end of input string ending in backslash
- - sem_wait and sem_timedwait were wrongly not interruptible by signals
- - getspnam[_r] wrongly treated not-found as an error
- arch-specfic bugs fixed:
- - soft deadlocks (missing futex wake) on powerpc locking
- - dlsym returned wrong address for thread-local symbols on ppc/mips/m68k
- 1.1.22 release notes
- new features:
- - priority-inheritance mutexes
- - membarrier syscall, pre-registration to use it, fallback emulation
- - header-level support for new linux features in 4.19, 4.20, 5.0
- major internal changes:
- - complete, async-safe view of all existent threads as global list
- - robust __synccall based on new thread list
- - new dynamic TLS is installed synchronously at dlopen
- - TLSDESC resolver functions no longer make bad ABI assumptions to call C
- - resolved shared library dependencies are now recorded
- compatibility & conformance:
- - dependency-order shared library constructor execution
- - sigaltstack no longer rejects SS_AUTODISARM, future flags
- - FILE is now a complete (dummy) type in pre-C11 feature profiles
- - setvbuf reports failure on invalid arguments
- - TSVTX is exposed unconditionally in tar.h
- - multithreaded set*id() no longer depends on /proc
- - key slot reuse after pthread_key_delete no longer depends on /proc
- bugs fixed:
- - failures in multithreaded set*id() with concurrent thread creation/exit
- - interposed free was called from invalid/inconsistent contexts
- - freeaddrinfo performed invalid free of some partial results lists
- - dlsym dependency order search had false negatives and false positives
- - dn_skipname gave wrong results for labels with 8-bit content
- - dcngettext clobbered errno, often breaking printing of error messages
- - sscanf read past end of buffer under certain conditions (1.1.21 regression)
- - pthread_key_create spuriously failed under race condition (1.1.21 regression)
- - fdopendir wrongly succeeded with O_PATH file descriptors
- - gets behaved incorrectly in presence of null bytes
- - namespace violations in c11 tsd and mutex function dependencies
- - incorrect prototype for makecontext (unimplemented)
- arch-specfic bugs fixed:
- - s390x had wrong values for POSIX_FADV_DONTNEED/_NOREUSE
- 1.1.23 release notes
- new features:
- - riscv64 port
- - configure now allows customizing AR and RANLIB vars
- - header-level support for new linux features in 5.1
- major internal changes:
- - removed extern __syscall; syscall header code is now fully self-contained
- performance:
- - new math library implementation for log/exp/pow
- - aarch64 dynamic tlsdesc function is streamlined
- compatibility & conformance:
- - O_TTY_INIT is now defined
- - sys/types.h no longer pollutes namespace with sys/sysmacros.h in any profile
- - powerpc asm is now compatible with clang internal assembler
- changes for new POSIX interpretations:
- - fgetwc now sets stream error indicator on encoding errors
- - fmemopen no longer rejects 0 size
- bugs fixed:
- - static TLS for shared libraries was allocated wrong on "Variant I" archs
- - crash in dladdr reading through uninitialized pointer on non-match
- - sigaltstack wrongly errored out on invalid ss_size when doing SS_DISABLE
- - getdents function misbehaved with buffer length larger than INT_MAX
- - set*id could deadlock after fork from multithreaded process
- arch-specfic bugs fixed:
- - s390x SO_PEERSEC definition was wrong
- - passing of 64-bit syscall arguments was broken on microblaze
- - posix_fadvise was broken on mips due to missing 7-arg syscall support
- - vrregset_t layout and member naming was wrong on powerpc64
- 1.1.24 release notes
- new features:
- - GLOB_TILDE extension to glob
- - non-stub catgets localization API, using netbsd binary catalog format
- - posix_spawn file actions for [f]chdir (extension, pending future standard)
- - secure_getenv function (extension)
- - copy_file_range syscall wrapper (Linux extension)
- - header-level support for new linux features in 5.2
- performance:
- - new fast path for lrint (generic C version) on 32-bit archs
- major internal changes:
- - functions involving time are overhauled to be time64-ready in 32-bit archs
- - x32 uses the new time64 code paths to replace nasty hacks in syscall glue
- compatibility & conformance:
- - support for powerpc[64] unaligned relocation types
- - powerpc[64] and sh sys/user.h no longer clash with kernel asm/ptrace.h
- - select no longer modifies timeout on failure (or at all)
- - mips64 stat results are no longer limited to 32-bit time range
- - optreset (BSD extension) now has a public declaration
- - support for clang inconsistencies in wchar_t type vs some 32-bit archs
- - mips r6 syscall asm no longer has invalid lo/hi register clobbers
- - vestigial asm declarations of __tls_get_new are removed (broke some tooling)
- - riscv64 mcontext_t mismatch glibc's member naming is corrected
- bugs fixed:
- - glob failed to match broken symlinks consistently
- - invalid use of interposed calloc to allocate initial TLS
- - various dlsym symbol resolution logic errors
- - semctl with SEM_STAT_ANY didn't work
- - pthread_create with explicit scheduling was subject to priority inversion
- - pthread_create failure path had data race for thread count
- - timer_create with SIGEV_THREAD notification had data race getting timer id
- - wide printf family failed to support l modifier for float formats
- arch-specific bugs fixed:
- - x87 floating point stack imbalance in math asm (i386-only CVE-2019-14697)
- - x32 clock_adjtime, getrusage, wait3, wait4 produced junk (struct mismatches)
- - lseek broken on x32 and mipsn32 with large file offsets
- - riscv64 atomics weren't compiler barriers
- - riscv64 atomics had broken asm constraints (missing earlyclobber flag)
- - arm clone() was broken when compiled as thumb if start function returned
- - mipsr6 setjmp/longjmp did not preserve fpu register state correctly
- 1.2.0 release notes
- new features:
- - time_t is now 64-bit on all archs (not just 64-bit archs)
- - character type & case mapping data updated to Unicode 12.1.0
- - header-level support for new linux features in 5.3 and 5.4
- performance:
- - new O(1) wchar_t case mapping implementation
- - i386 now uses C math code for exp, faster than old asm
- - mips math asm
- compatibility & conformance:
- - endian.h now aims to conform to future POSIX definition
- - support older compilers that don't accept powerpc math asm constraints
- - fdpic code in ldso was incompatible with valid optimizations in gcc 9+
- - RLIMIT_RTTIME was missing from sys/resource.h
- bugs fixed:
- - wcwidth wrongly returned 0 for most of planes 4 and up
- - missing case mapping between U+03F3 and U+037F
- - wrong cacosh results for arguments with negative imaginary part
- - wrong catanf/catanl results for various classes of arguments
- - wrong return value for ungetc with argument outside [0,UCHAR_MAX]
- - posix_openpt with no ptys available produced wrong errno
- arch-specific bugs fixed:
- - sigcontext/regset definition mistakes & omissions on m68k, powerpc64
- - fesetenv(FE_DFL_ENV) crashed on riscv64
- - sh2 dynamic linker was broken since 1.1.21 (crash in stage 2b)
- - arm dynamic linker chose wrong tls/atomic variants since 1.1.21
- - some math library functions returned excess precision on i386
- - unconfirmed regression in fchmodat AT_SYMLINK_NOFOLLOW on mips*
- 1.2.1 release notes
- major changes:
- - new malloc implementation (mallocng & overhauled bump allocator)
- new features:
- - DNS queries via res_* now set AD flag, report zone signedness (DNSSEC)
- - PTHREAD_NULL macro (POSIX-future)
- performance:
- - optimized memcpy and memset for aarch64
- - optimized memcpy for arm now supports big endian
- - optimized x86_64 remquol
- - improved strerror without linear search
- bugs fixed:
- - lock-skipping for processes that returned to single-threaded was wrong
- - AF_UNSPEC dns lookups mishandled single failure in paired A+AAAA
- - res_send and res_query returned wrong value on errors from nameserver
- - corrupted sysvipc timestamps on 32-bit archs with old kernels
- - incorrect parsing of timezone offsets after overly-long zone name
- - clock_adjtime was broken on 32-bit archs (time64)
- - pthread_kill as not async-signal-safe
- - pthread_cancel was not async-cancel-safe
- - large-ulp errors in various math functions in non-default rounding modes
- arch-specific bugs fixed:
- - arm clock_gettime was broken on some hw due to bad time64 vdso
- - m68k sqrtl lacked long double precision
- - mips* syscall mechanism regressions on older kernels
- - mips* had negated error codes for some syscalls (kernel bug)
- - mips* SIGEMT was wrongly called SIGSTKFLT
- - sh fesetround didn't work correctly on sh
- 1.2.2 release notes
- major changes:
- - child restrictions lifted after fork of multithreaded parent
- new features:
- - _Fork function (POSIX-future)
- - reallocarray function (extension from OpenBSD, now widespread)
- - gettid function (kernel tid as supported concept)
- - SIGEV_THREAD_ID sigevent API (Linux extension)
- - tcgetwinsize and tcsetwinsize functions (POSIX-future)
- performance:
- - faster software sqrt on archs without native sqrt instruction
- compatibility:
- - realpath no longer depends on procfs availability & accuracy
- - time zone parser now always prefers 64-bit tables if present
- - crypt_blowfish now supports $2b$ prefix
- - res_query now reports errors via h_errno
- - set*id and setrlimit are now safe in vforked/cloned child
- - setgroups now applies to all threads
- - dlopen debugger notification is improved, should work with lldb
- - setrlimit no longer needs __synccall broadcast on linux 2.6.36+
- - faccessat with AT_EACCESS no longer needs child process on linux 5.8+
- bugs fixed:
- - buffer overflow and infinite loop errors in wcsnrtombs (CVE-2020-28928)
- - sem_close unmapped still-referenced semaphores
- - fork of process with active aio could deadlock or crash paren
- - pthread_cond_wait was broken with priority-inheritance mutex
- - getgrouplist wrongly failed when nscd reported an empty list
- - abort could leak modified SIGABRT disposition to fork or posix_spawn child
- - regression with mallocng: malloc_usable_size(0) crashed
- - readlink wrongly gave EINVAL on zero length dest buffer
- - sqrtl was severely inaccurate (not correctly rounded) on ldquad archs
- - assert failure wrongly flushed stdio (possible deadlock)
- - MUSL_LOCPATH search was broken with multiple components
- - missing newline in herror output
- - possible deadlock in pthread_exit with pshared mutex or barrier usage
- - pthread_mutexattr_getprotocol didn't read back protocol
- - v4l2 ioctl translation for pre-time64 kernels didn't work
- arch-specific bugs fixed:
- - x86_64 longjmp failed to handle 0 argument reliably
- - i386 __set_thread_area fallback for pre-2.6 kernels didn't work
- - missing O_LARGEFILE macro value on x86_64, x32, mips64
- - unpredictable s390x breakage from failure to preserve call-saved registers
- 1.2.3 release notes
- new features:
- - qsort_r function (POSIX-future)
- - pthread_getname_np extension function
- - hard float on SPE FPU for powerpc-sf
- - SEEK_DATA and SEEK_HOLE exposed in unistd.h (Linux extensions)
- compatibility:
- - free now preserves errno (POSIX-future requirement)
- - setjmp is declared explicitly with returns_twice for non-GCC compilers
- - macro version of isascii is no longer defined for C++
- - dynamic linker now tolerates zero-length LOAD segments
- - epoll_[p]wait is now a cancellation point
- - pwd/grp functions no longer fail on systems without AF_UNIX support
- - POSIX TZ parsing is stricter to allow more names to fallback to files
- - NULL is now defined as nullptr when used in C++11 or later
- - gettext now accepts null pointer as argument
- bugs fixed:
- - old regression in wcwidth of Hangul combining (vowel/final) letters
- - duplocale used wrong malloc when malloc was replaced (1.2.2 regression)
- - fmaf rounded wrong on archs without FE_TOWARDZERO (all softfloat archs)
- - popen didn't honor requirement not to leak other popen pipe fds to child
- - aligned_alloc and variants crashed on allocation failure
- - dl_iterate_phdr reported incorrect module TLS pointers
- - mishandling of some inputs in acoshf and expm1f and functions using them
- - potentially wrong-sign zero in cproj functions at infinity
- - multiple bugs in legacy function cuserid
- - minor posix_spawn file actions API conformance issues
- - pthread_setname_np fd leak
- - out-of-bound read in zoneinfo handling with distant-past times
- - out-of-tree builds lacked generated debug cfi for x86 asm
- arch-specific bugs fixed:
- - powerpc (32-bit) struct shmid_ds layout was wrong for some fields
- - time64 struct layout was wrong in sound ioctl fallback (32-bit archs)
- 1.2.4 release notes
- new features:
- - large dns record lookups via tcp fallback
- - new getaddrinfo EAI_NODATA result to distinguish NODATA/NxDomain
- - support for new RELR compressed format for relative relocations
- - sysconf keys for querying signal stack size requirements
- - real vfork on riscv64
- performance:
- - mallocng no longer uses MADV_FREE (high performance cost, little gain)
- - vdso clock_gettime is supported once again on 32-bit arm
- compatibility:
- - gethostbyname family now distinguishes NO_DATA from HOST_NOT_FOUND
- - res_send now works with caller-provided edns0 queries
- - arpa/nameser.h RR types list is now up-to-date
- - previously-missing POSIX confstr keys have been added
- - mntent interfaces now accept missing fields
- - alt signal stack, if any, is now used for internal signals
- - the LFS64 macros are no longer exposed without _LARGEFILE64_SOURCE
- - memmem (POSIX-future) is now exposed in default feature profile
- - pthread_atfork now admits calls from an application-provided malloc
- - debugger tracking of shared libraries now works on MIPS PIE binaries
- - sendmsg now supports up to SCM_MAX_FD fds in SCM_RIGHTS messages
- bugs fixed:
- - gethostbyname[2]_r wrongly returned nonzero (error) on negative result
- - parallel v4/v6 address queries could fail on query id collisions
- - spurious getaddrinfo/AI_ADDRCONFIG failures due to errno clobbering
- - dns search domains ending in dot (including lone dot) broke lookups
- - ipv6 servers in resolv.conf broke lookups on systems with v6 disabled
- - systems with bindv6only failed to query both v4 and v6 nameservers
- - res_mkquery mishandled consecutive final dots in name
- - res_send could malfunction for very small answer buffer sizes
- - resolver dns backend accepted answers with wrong (A vs AAAA) RR type
- - getservbyport_r returned junk or ENOENT (vs ERANGE) on buffer size errors
- - dns result parsing of malformed responses could process uninitialized data
- - freopen didn't reset stream orientation (byte/wide) & encoding rule
- - fwprintf didn't print most fields on open_wmemstream FILEs
- - wide printf %lc ignored field width
- - wide printf erroneously processed %n after encoding errors
- - use of wide printf %9$ argument slot overflowed undersized buffer
- - swprintf malfunctioned on nul character in output
- - strverscmp ordered digit sequences vs nondigits incorrectly
- - timer_create/SIGEV_THREAD failure leaked the thread
- - semaphores were subject to missed-wake under certain usage patterns
- - several possible rare deadlocks with lock handling at thread exit
- - several possible rare deadlocks with aio and multithreaded fork
- - dynamic linker relro processing was broken on archs w/variable pagesize
- - async cancellation could run cancellation handlers in invalid context
- - pthread_detach was wrongly a cancellation point in rare race code path
- - use-after-close/double-close errors in mq_notify error paths
- - mq_notify event thread wrongly ran with signals unmasked
- - wcs{,n}cmp, wmemcmp returned wrong results when difference overflowed
- - accept4, pipe2, and dup3 handled unknown flags wrong in fallback cases
- - CPU_SETSIZE macro had wrong unit
- - select fallback for pre-time64 kernels truncated timeout (vs clamping)
- arch-specific bugs fixed:
- - x32 new socketcalls took fallback path due to pointer sign extension
- - x32 wait4 didn't fill rusage structure (time64 regression)
- - x32 semtimedop mismatched timespec ABI with kernel (time64 regression)
- - sigaction signal mask was bogus on or1k, microblaze, mips, and riscv
- - powerpc-sf longjmp asm clobbered value argument
- - or1k poll function passed timeout to syscall in wrong form
- 1.2.5 release notes
- new features:
- - statx function (linux extension; via syscall and fallback using fstatat)
- - clone function is now usable and gives _Fork-like consistency in child
- - statvfs now provides f_type result
- - preadv2 and pwritev2 (linux extension) syscall wrappers
- - riscv64 TLSDESC support
- new ports:
- - loongarch64
- - riscv32
- compatibility:
- - DNS resolver can now handle answers with long CNAME chains
- - string.h no longer provides (C23-incompat) non-prototype decl of basename
- - fstatat statx backend now matches stat syscall non-automounting behavior
- - mntent interfaces now handle escaped whitespace in paths/options
- standards updates:
- - printf %lc of nul wchar now produces output
- - snprintf and swprintf no longer fail on n > INT_MAX
- - ppoll is now exposed in default feature profile
- bugs fixed:
- - some long DNS answers were wrongly rejected despite new TCP support
- - glob could wrongly return GLOB_NOMATCH if aborted before any matches
- - multithreaded set*id could malfunction from thread sequencing logic bug
- - certain use of threads after fork could deadlock thread-list lock
- - posix_spawn child could deadlock in race with async parent death
- - mbrtowc return value was wrong if argument n exceeded UINT_MAX
- - 80-bit extended acoshl and powl got some corner cases wrong
- - syslog incorrectly generated localized timestamps
- arch-specific bugs fixed:
- - arm (32-bit) TLSDESC malfunctioned due to addends being processed wrong
- - riscv64 icache flush operation was non-functional
- - sh sigsetjmp failed to properly restore call-saved register r8 on return
- - sh dlsym RTLD_NEXT did not identify calling module correctly
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