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2012-09-15revert low rounds-count limits in crypt hashesRich Felker4-4/+4
it was determined in discussion that these kind of limits are not sufficient to protect single-threaded servers against denial of service attacks from maliciously large round counts. the time scales simply vary too much; many users will want login passwords with rounds counts on a scale that gives decisecond latency, while highly loaded webservers will need millisecond latency or shorter. still some limit is left in place; the idea is not to protect against attacks, but to avoid the runtime of a single call to crypt being, for all practical purposes, infinite, so that configuration errors can be caught and fixed without bringing down whole systems. these limits are very high, on the order of minute-long runtimes for modest systems.
2012-09-15update mips cancellation-point syscall asm with 7-arg and r25 fixesRich Felker1-2/+5
these fixes were already made to the normal syscall asm but not the cancellation point version.
2012-09-14workaround gcc got-register-reload performance problems in mallocRich Felker1-4/+8
with this patch, the malloc in libc.so built with -Os is nearly the same speed as the one built with -O3. thus it solves the performance regression that resulted from removing the forced -O3 when building libc.so; now libc.so can be both small and fast.
2012-09-14use vfork if possible in posix_spawnRich Felker1-1/+3
vfork is implemented as the fork syscall (with no atfork handlers run) on archs where it is not available, so this change does not introduce any change in behavior or regression for such archs.
2012-09-10asm for memmove on i386 and x86_64Rich Felker2-0/+36
for the sake of simplicity, I've only used rep movsb rather than breaking up the copy for using rep movsd/q. on all modern cpus, this seems to be fine, but if there are performance problems, there might be a need to go back and add support for rep movsd/q.
2012-09-10fix another ppoll issue (missing sigset_t size argument)Rich Felker1-1/+1
2012-09-10reenable word-at-at-time copying in memmoveRich Felker1-4/+27
before restrict was added, memove called memcpy for forward copies and used a byte-at-a-time loop for reverse copies. this was changed to avoid invoking UB now that memcpy has an undefined copying order, making memmove considerably slower. performance is still rather bad, so I'll be adding asm soon.
2012-09-10fix ppoll with null timeout argumentRich Felker1-2/+2
2012-09-09add setdomainname syscall, fix getdomainname (previously a stub)Rich Felker2-1/+17
2012-09-09mincore syscall wrapperRich Felker1-0/+8
2012-09-09fix up lfs64 junk for preadv/pwritevRich Felker2-2/+2
2012-09-09add preadv/pwritev syscall wrappersRich Felker2-0/+26
2012-09-09add linux ppoll syscall wrapperRich Felker1-0/+9
2012-09-09reenable sync_file_range; should no longer break on mipsRich Felker1-2/+2
2012-09-09add 7-arg syscall support for mipsRich Felker2-4/+8
no syscalls actually use that many arguments; the issue is that some syscalls with 64-bit arguments have them ordered badly so that breaking them into aligned 32-bit half-arguments wastes slots with padding, and a 7th slot is needed for the last argument.
2012-09-09fix mips syscall_cp_asm code (saved register usage)Rich Felker1-2/+2
2012-09-09fix broken mips syscall asmRich Felker1-2/+2
this code was using $10 to save the syscall number, but $10 is not necessarily preserved by the kernel across syscalls. only mattered for syscalls that got interrupted by a signal and restarted. as far as i can tell, $25 is preserved by the kernel across syscalls.
2012-09-08disable sync_file_range for nowRich Felker1-2/+3
something is wrong with the logic for the argument layout, resulting in compile errors on mips due to too many args to syscall... further information on how it's supposed to work will be needed before it can be reactivated.
2012-09-08syscall organization overhaulRich Felker1-5/+138
now public syscall.h only exposes __NR_* and SYS_* constants and the variadic syscall function. no macros or inline functions, no __syscall_ret or other internal details, no 16-/32-bit legacy syscall renaming, etc. this logic has all been moved to src/internal/syscall.h with the arch-specific parts in arch/$(ARCH)/syscall_arch.h, and the amount of arch-specific stuff has been reduced to a minimum. changes still need to be reviewed/double-checked. minimal testing on i386 and mips has already been performed.
2012-09-08add acct syscall source file, omitted in last syscalls commitRich Felker1-0/+9
2012-09-08add acct, accept4, setns, and dup3 syscalls (linux extensions)Rich Felker3-0/+28
based on patch by Justin Cormack
2012-09-08add linux tee syscallRich Felker1-0/+8
2012-09-08add linux sync_file_range syscallRich Felker1-0/+16
2012-09-08move fallocate syscall wrapper to linux-specific syscalls dirRich Felker1-0/+0
2012-09-08add linux readahead syscallRich Felker1-0/+8
2012-09-08add fallocate (nonstandardized) functionRich Felker1-0/+9
this is equivalent to posix_fallocate except that it has an extra mode/flags argument to control its behavior, and stores the error in errno rather than returning an error code.
2012-09-08fix broken fallocate syscall in posix_fallocateRich Felker1-1/+1
the syscall takes an extra flag argument which should be zero to meet the POSIX requirements.
2012-09-08add timerfd interfaces (untested)Rich Felker1-0/+17
2012-09-07cleanup src/linux and src/misc trees, etc.Rich Felker45-98/+74
previously, it was pretty much random which one of these trees a given function appeared in. they have now been organized into: src/linux: non-POSIX linux syscalls (possibly shard with other nixen) src/legacy: various obsolete/legacy functions, mostly wrappers src/misc: still mostly uncategorized; some misc POSIX, some nonstd src/crypt: crypt hash functions further cleanup will be done later.
2012-09-06fix constraint violation in ftwRich Felker1-1/+4
void* does not implicitly convert to function pointer types.
2012-09-06further use of _Noreturn, for non-plain-C functionsRich Felker6-10/+10
note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
2012-09-06fix invalid implicit pointer conversion in gnulib-compat functionsRich Felker1-1/+1
2012-09-06add _Noreturn function attribute, with fallback for pre-C11 GNUCRich Felker4-4/+4
2012-09-06use restrict everywhere it's required by c99 and/or posix 2008Rich Felker164-198/+199
to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
2012-09-06remove dependency of wmemmove on wmemcpy directionRich Felker1-4/+4
unlike the memmove commit, this one should be fine to leave in place. wmemmove is not performance-critical, and even if it were, it's already copying whole 32-bit words at a time instead of bytes.
2012-09-06remove dependency of memmove on memcpy directionRich Felker1-5/+4
this commit introduces a performance regression in many uses of memmove, which will need to be addressed before the next release. i'm making it as a temporary measure so that the restrict patch can be committed without invoking undefined behavior when memmove calls memcpy with overlapping regions.
2012-09-06fix broken ttyname[_r] (failure to null-terminate result)Rich Felker1-1/+4
2012-08-30fix missing statics in crypt_sha256 codeRich Felker1-3/+3
2012-08-29anti-DoS rounds count limits for blowfish and des cryptRich Felker2-2/+2
all of the limits could use review, but err on the side of avoiding excessive rounds for now.
2012-08-29limit sha512 rounds to similar runtime to sha256 limitRich Felker1-1/+1
these limits could definitely use review, but for now, i feel consistency and erring on the side of preventing servers from getting bogged down by excessively-slow user-provided settings (think .htpasswd) are the best policy. blowfish should be updated to match.
2012-08-29add sha256/sha512 cryptRich Felker4-1/+700
based on versions sent to the list by nsz, with some simplification and debloating. i'd still like to get them a bit smaller, or ideally merge them into a single file with most of the code being shared, but that can be done later.
2012-08-27fix bug caused by main app & libc having map set; cannot free themRich Felker1-1/+1
2012-08-26dladdr support for dynamic linker (nonstandard extension)Rich Felker2-0/+95
based on patches submitted by boris brezillon. this commit also fixes the issue whereby the main application and libc don't have the address ranges of their mappings stored, which was theoretically a problem for RTLD_NEXT support in dlsym; it didn't actually matter because libc never calls dlsym, and it seemed to be doing the right thing (by chance) for symbols in the main program as well.
2012-08-25implement "low hanging fruit" from C11Rich Felker4-49/+57
based on Gregor's patch sent to the list. includes: - stdalign.h - removing gets in C11 mode - adding aligned_alloc and adjusting other functions to use it - adding 'x' flag to fopen for exclusive mode
2012-08-25add c11 quick_exit and at_quick_exit functionsRich Felker2-0/+44
2012-08-25fix bug in gnu hash lookup on dlsym(handle, name) lookupsRich Felker1-1/+1
wrong hash was being passed; just a copy/paste error. did not affect lookups in the global namespace; this is probably why it was not caught in testing.
2012-08-25clean up search_vec usage for vdsoRich Felker1-2/+2
2012-08-25use new search_vec function to find vdso in dynamic linkerRich Felker1-4/+2
2012-08-25ensure canary is setup if stack-prot libs are dlopen'd into non-ssp appRich Felker2-2/+6
previously, this usage could lead to a crash if the thread pointer was still uninitialized, and otherwise would just cause the canary to be zero (less secure).
2012-08-25add gnu hash support in the dynamic linkerRich Felker1-12/+85
based on the patches contributed by boris brezillon.
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