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Improve signals and memory protection

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- Document sigaction()
- Simplify New Technology fork() code
- Testing and many bug fixes for mprotect()
- Distribute Intel Xed ILD in the amalgamation
- Turn Xed enums into defines to avoid DWARF bloat
- Improve polyfilling of SA_SIGINFO on BSDs and fix bugs
- setpgid(getpid(), getpid()) on Windows will ignore CTRL-C
- Work around issues relating to NT mappings being executable
- Permit automatic executable stack override via `ape_stack_pf`
This commit is contained in:
Justine Tunney 2022-04-12 22:11:00 -07:00
parent c95c9d9508
commit f684e348d4
76 changed files with 1844 additions and 1121 deletions
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5
libc/sysv/consts.sh
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@ -234,7 +234,6 @@ syscon mmap MAP_HUGE_SHIFT 26 0 0 0 0 0
syscon mmap MAP_LOCKED 0x2000 0 0 0 0 0
syscon mmap MAP_NONBLOCK 0x10000 0 0 0 0 0
syscon mmap MAP_POPULATE 0x8000 0 0 0 0 0 # can avoid madvise(MADV_WILLNEED) on private file mapping
syscon mmap MAP_CONCEAL 0 0 0 0x8000 0 0 # omit from dumps
syscon mmap MAP_STACK 0x0100 0 0x0000400 0x4000 0x2000 0x100000 # use MAP_GROWSDOWN
syscon compat MAP_NOCORE 0 0 0x0020000 0x8000 0x8000 0 # use MAP_CONCEAL
syscon compat MAP_ANON 0x20 0x1000 0x0001000 0x1000 0x1000 0x20 # bsd consensus; faked nt
@ -541,7 +540,7 @@ syscon sigact SA_NOCLDWAIT 2 32 32 32 32 2 # changes SIGCHLD so t
syscon sigact SA_SIGINFO 4 64 64 64 64 4 # asks kernel to provide ucontext_t argument, which has mutable cpu/fpu state of signalled process; and it is polyfilled by cosmopolitan; bsd consensus
syscon sigact SA_ONSTACK 0x08000000 1 1 1 1 0x08000000 # causes signal handler to be called on stack provided by sigaltstack(2); bsd consensus
syscon sigact SA_RESTART 0x10000000 2 2 2 2 0x10000000 # prevents signal delivery from triggering EINTR on i/o calls (e.g. read/write/open/wait/accept) but doesn't impact non-i/o blocking calls (e.g. poll, sigsuspend, nanosleep) which will still EINTR; bsd consensus
syscon sigact SA_NODEFER 0x40000000 16 16 16 16 0x40000000 # blocks signal delivery during signal handling (i.e. lets you use longjmp() in the signal handler); bsd consensus
syscon sigact SA_NODEFER 0x40000000 16 16 16 16 0x40000000 # lets signal handler be reentrant (e.g. so you can longjmp() out of signal handler); bsd consensus
syscon sigact SA_RESETHAND 0x80000000 4 4 4 4 0x80000000 # causes signal handler to be called at most once and then set to SIG_DFL automatically; bsd consensus
syscon compat SA_NOMASK 0x40000000 16 16 16 16 0x40000000 # same as SA_NODEFER
syscon compat SA_ONESHOT 0x80000000 4 4 4 4 0x80000000 # same as SA_RESETHAND
@ -571,6 +570,7 @@ syscon sicode TRAP_BRKPT 1 1 1 1 1 1 # SIGTRAP; process breakpoin
syscon sicode TRAP_TRACE 2 2 2 2 2 2 # SIGTRAP; process trace trap; unix consensus
syscon sicode SEGV_MAPERR 1 1 1 1 1 1 # SIGSEGV; address not mapped to object; unix consensus
syscon sicode SEGV_ACCERR 2 2 2 2 2 2 # SIGSEGV; invalid permissions for mapped object; unix consensus
syscon sicode SEGV_PKUERR -1 -1 100 -1 -1 -1 # SIGSEGV: x86: PKU violation
syscon sicode FPE_INTDIV 1 7 2 1 1 1 # SIGFPE; integer divide by zero
syscon sicode FPE_INTOVF 2 8 1 2 2 2 # SIGFPE; integer overflow
syscon sicode FPE_FLTDIV 3 1 3 3 3 3 # SIGFPE; floating point divide by zero
@ -590,6 +590,7 @@ syscon sicode ILL_BADSTK 8 8 8 8 8 8 # SIGILL; internal stack err
syscon sicode BUS_ADRALN 1 1 1 1 1 1 # SIGBUS; invalid address alignment; unix consensus
syscon sicode BUS_ADRERR 2 2 2 2 2 2 # SIGBUS; non-existent physical address; unix consensus
syscon sicode BUS_OBJERR 3 3 3 3 3 3 # SIGBUS; object specific hardware error; unix consensus
syscon sicode BUS_OOMERR -1 -1 100 -1 -1 -1 # SIGBUS; Non-standard: No memory.
syscon sicode BUS_MCEERR_AR 4 0x80000000 0x80000000 0x80000000 0x80000000 0x80000000 # SIGBUS; Linux 2.6.32+
syscon sicode BUS_MCEERR_AO 5 0x80000000 0x80000000 0x80000000 0x80000000 0x80000000 # SIGBUS; Linux 2.6.32+
syscon sicode POLL_IN 1 1 1 1 1 1 # SIGIO; data input available; unix consensus