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* security hardening: ensure suid programs have valid stdin/out/errRich Felker2011-08-232-0/+10
| | | | | | | | | | | this behavior (opening fds 0-2 for a suid program) is explicitly allowed (but not required) by POSIX to protect badly-written suid programs from clobbering files they later open. this commit does add some cost in startup code, but the availability of auxv and the security flag will be useful elsewhere in the future. in particular auxv is needed for static-linked vdso support, which is still waiting to be committed (sorry nik!)
* typo in macro definitions for x86_64Rich Felker2011-08-141-1/+1
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* ensure the compiler does not move around thread-register-based readsRich Felker2011-08-062-2/+2
| | | | | | if gcc decided to move this across a conditional that checks validity of the thread register, an invalid thread-register-based read could be performed and raise sigsegv.
* socket headers macro adjustment - workaround for buggy programsRich Felker2011-07-212-2/+2
| | | | some program was undefining AF_NETLINK and thereby breaking AF_ROUTE...
* fix some symbol resolution issues in dynamic linkerRich Felker2011-06-252-0/+2
| | | | | 1. search was wrongly beginning with lib itself rather than dso head 2. inconsistent resolution of function pointers for functions in plt
* move all limits that don't vary out of bits/limits.h, into main limits.hRich Felker2011-06-252-53/+2
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* proper path searching for dynamic linkerRich Felker2011-06-252-0/+4
| | | | | first, use $LD_LIBRARY_PATH unless suid. if that fails, read path from /etc/ld-musl-$ARCH.path and fallback to a builtin default.
* experimental dynamic linker!Rich Felker2011-06-182-0/+54
| | | | | | | | some notes: - library search path is hard coded - x86_64 code is untested and may not work - dlopen/dlsym is not yet implemented - relocations in read-only memory won't work
* __syscall5 inline is having trouble with PIC; just use the function for nowRich Felker2011-06-141-0/+7
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* use __WCHAR_TYPE__ on i386 if it is definedRich Felker2011-06-071-0/+4
| | | | | | | | | | | | | | unfortunately traditional i386 practice was to use "long" rather than "int" for wchar_t, despite the latter being much more natural and logical. we followed this practice, but it seems some compilers (clang and maybe certain gcc builds or others too..?) have switched to using int, resulting in spurious pointer type mismatches when L"..." wide strings are used. the best solution I could find is to use the compiler's definition of wchar_t if it exists, and otherwise fallback to the traditional definition. there's no point in duplicating this approach on 64-bit archs, as their only 32-bit type is int.
* use compiler builtins for variadic macros when availableRich Felker2011-04-272-1/+5
| | | | | | | | | | | this slightly cuts down on the degree musl "fights with" gcc, but more importantly, it fixes a critical bug when gcc inlines a variadic function and optimizes out the variadic arguments due to noticing that they were "not used" (by __builtin_va_arg). we leave the old code in place if __GNUC__ >= 3 is false; it seems like it might be necessary at least for tinycc support and perhaps if anyone ever gets around to fixing gcc 2.95.3 enough to make it work..
* add word-sized ctz function to atomic.hRich Felker2011-04-272-4/+16
| | | | | | strictly speaking this and a few other ops should be factored into asm.h or the file should just be renamed to asm.h, but whatever. clean it up someday.
* move wait.h macros out of bits. they do not vary.Rich Felker2011-04-214-46/+0
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* namespace fixes for sys/mman.hRich Felker2011-04-202-30/+30
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* add syscall wrappers for posix_fadvise, posix_fallocateRich Felker2011-04-202-0/+6
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* overhaul pthread cancellationRich Felker2011-04-175-9/+12
| | | | | | | | | | | | | | | | | | | | | | this patch improves the correctness, simplicity, and size of cancellation-related code. modulo any small errors, it should now be completely conformant, safe, and resource-leak free. the notion of entering and exiting cancellation-point context has been completely eliminated and replaced with alternative syscall assembly code for cancellable syscalls. the assembly is responsible for setting up execution context information (stack pointer and address of the syscall instruction) which the cancellation signal handler can use to determine whether the interrupted code was in a cancellable state. these changes eliminate race conditions in the previous generation of cancellation handling code (whereby a cancellation request received just prior to the syscall would not be processed, leaving the syscall to block, potentially indefinitely), and remedy an issue where non-cancellable syscalls made from signal handlers became cancellable if the signal handler interrupted a cancellation point. x86_64 asm is untested and may need a second try to get it right.
* fix O_SYNC definition, cleanup fcntl.hRich Felker2011-04-142-22/+10
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* fix FAPPEND typo on x86_64 (previously only fixed on i386)Rich Felker2011-04-141-1/+1
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* fcntl.h: move macros that do not vary between archs out of bitsRich Felker2011-04-142-48/+0
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* fix broken fcntl locks on x86_64Rich Felker2011-04-141-3/+3
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* fix typo in legacy FAPPEND definitionRich Felker2011-04-141-1/+1
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* numerous fixes to sysv ipcRich Felker2011-04-136-48/+36
| | | | | | | | | | some of these definitions were just plain wrong, others based on outdated ancient "non-64" versions of the kernel interface. as much as possible has now been moved out of bits/* these changes break abi (the old abi for these functions was wrong), but since they were not working anyway it can hardly matter.
* fix and cleanup suseconds_t/timeval stuff (broken on 64-bit)Rich Felker2011-04-131-1/+1
| | | | | trash in the upper 32 bits was making the kernel sleep forever in select on 64-bit systems.
* more types cleanupRich Felker2011-04-112-6/+0
| | | | | | | | the basic idea is that the only things in alltypes.h should be types that either vary from system to system (in practice, not just in theoretical la-la land - this is the implementation so we choose what constraints we want to impose on ports) or which are needed by multiple system headers.
* cleanup types stuff in headers, fix missing u_int*_t in sys/types.hRich Felker2011-04-112-22/+0
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* add missing float.h macrosRich Felker2011-04-102-0/+6
| | | | | | actually FLT_ROUNDS needs to expand to a static inline function that obtains the current rounding mode and returns it, but that will be added later with fenv.h stuff.
* workaround broken msghdr struct on 64bit linuxRich Felker2011-04-081-2/+2
| | | | | | | | | | | POSIX clearly specifies the type of msg_iovlen and msg_controllen, and Linux ignores it and makes them both size_t instead. to work around this we add padding (instead of just using the wrong types like glibc does), but we also need to patch-up the struct before passing it to the kernel in case the caller did not zero-fill it. if i could trust the kernel to just ignore the upper 32 bits, this would not be necessary, but i don't think it will ignore them...
* add ip6 pktinfo stuff for x86_64Rich Felker2011-04-051-0/+12
| | | | these defs should probably all be moved out of bits and unified...
* add some missing ipv6 stuffRich Felker2011-04-051-0/+12
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* uncomment IP_PKTINFORich Felker2011-04-052-2/+2
| | | | | this was a hack leftover from testing before the initial check-in to git.
* fix statvfs syscalls (missing size argument)Rich Felker2011-04-031-1/+1
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* remove obsolete and useless useconds_t typeRich Felker2011-04-012-2/+0
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* somehow timespec tv_nsec had the wrong type on x86_64... fixedRich Felker2011-04-011-1/+1
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* avoid all malloc/free in timer creation/destructionRich Felker2011-03-302-2/+2
| | | | | | | | | | instead of allocating a userspace structure for signal-based timers, simply use the kernel timer id. we use the fact that thread pointers will always be zero in the low bit (actually more) to encode integer timerid values as pointers. also, this change ensures that the timer_destroy syscall has completed before the library timer_destroy function returns, in case it matters.
* some preliminaries for adding POSIX timersRich Felker2011-03-292-2/+2
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* fix bug from syscall overhaul: extra __syscall_ret call for 0-arg syscallsRich Felker2011-03-281-1/+1
| | | | | this mainly just caused bloat, but could corrupt errno if a 0-arg syscall ever failed.
* match glibc/lsb cancellation abi on i386Rich Felker2011-03-251-0/+19
| | | | | | | | glibc made the ridiculous choice to use pass-by-register calling convention for these functions, which is impossible to duplicate directly on non-gcc compilers. instead, we use ugly asm to wrap and convert the calling convention. presumably this works with every compiler anyone could potentially want to use.
* overhaul cancellation to fix resource leaks and dangerous behavior with signalsRich Felker2011-03-242-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | this commit addresses two issues: 1. a race condition, whereby a cancellation request occurring after a syscall returned from kernelspace but before the subsequent CANCELPT_END would cause cancellable resource-allocating syscalls (like open) to leak resources. 2. signal handlers invoked while the thread was blocked at a cancellation point behaved as if asynchronous cancellation mode wer in effect, resulting in potentially dangerous state corruption if a cancellation request occurs. the glibc/nptl implementation of threads shares both of these issues. with this commit, both are fixed. however, cancellation points encountered in a signal handler will not be acted upon if the signal was received while the thread was already at a cancellation point. they will of course be acted upon after the signal handler returns, so in real-world usage where signal handlers quickly return, it should not be a problem. it's possible to solve this problem too by having sigaction() wrap all signal handlers with a function that uses a pthread_cleanup handler to catch cancellation, patch up the saved context, and return into the cancellable function that will catch and act upon the cancellation. however that would be a lot of complexity for minimal if any benefit...
* honor namespace for i386 syscall.h, even though it's not a standard headerRich Felker2011-03-191-50/+50
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* fix typo in x86_64 part of syscall overhaulRich Felker2011-03-191-1/+1
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* syscall overhaul part two - unify public and internal syscall interfaceRich Felker2011-03-196-284/+205
| | | | | | | | | | | | | | | | with this patch, the syscallN() functions are no longer needed; a variadic syscall() macro allows syscalls with anywhere from 0 to 6 arguments to be made with a single macro name. also, manually casting each non-integer argument with (long) is no longer necessary; the casts are hidden in the macros. some source files which depended on being able to define the old macro SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall() instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL have also been changed. x86_64 has not been tested, and may need a follow-up commit to fix any minor bugs/oversights.
* overhaul syscall interfaceRich Felker2011-03-194-736/+1494
| | | | | | | | | | | | | | | this commit shuffles around the location of syscall definitions so that we can make a syscall() library function with both SYS_* and __NR_* style syscall names available to user applications, provides the syscall() library function, and optimizes the code that performs the actual inline syscalls in the library itself. previously on i386 when built as PIC (shared library), syscalls were incurring bus lock (lock prefix) overhead at entry and exit, due to the way the ebx register was being loaded (xchg instruction with a memory operand). now the xchg takes place between two registers. further cleanup to arch/$(ARCH)/syscall.h is planned.
* various legacy and linux-specific stuffRich Felker2011-03-182-0/+2
| | | | | this commit is part of an effort to make more of busybox work out-of-the-box.
* optimize contended normal mutex case; add int compare-and-swap atomicRich Felker2011-03-172-0/+14
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* match dimensions so we can use all slots without invoking OOB-array-accessRich Felker2011-03-112-10/+10
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* fix missing ENOTSUP error codeRich Felker2011-03-112-0/+2
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* make sigaltstack work (missing macros in signal.h, error conditions)Rich Felker2011-03-102-0/+4
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* resolve some header namespace non-issuesRich Felker2011-02-201-1/+0
| | | | | after re-reading 2.2.2 of POSIX 2008, all of these are in the correct reserved namespaces and do not need protection.
* fill in some missing siginfo stuff in signal.hRich Felker2011-02-202-10/+112
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* add missing WIFCONTINUED macro and improve WIFSIGNALEDRich Felker2011-02-192-2/+4
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