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Improve signals and memory protection
- 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
parent
c95c9d9508
commit
f684e348d4
76 changed files with 1844 additions and 1121 deletions
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@ -234,7 +234,6 @@ syscon mmap MAP_HUGE_SHIFT 26 0 0 0 0 0
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syscon mmap MAP_LOCKED 0x2000 0 0 0 0 0
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syscon mmap MAP_NONBLOCK 0x10000 0 0 0 0 0
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syscon mmap MAP_POPULATE 0x8000 0 0 0 0 0 # can avoid madvise(MADV_WILLNEED) on private file mapping
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syscon mmap MAP_CONCEAL 0 0 0 0x8000 0 0 # omit from dumps
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syscon mmap MAP_STACK 0x0100 0 0x0000400 0x4000 0x2000 0x100000 # use MAP_GROWSDOWN
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syscon compat MAP_NOCORE 0 0 0x0020000 0x8000 0x8000 0 # use MAP_CONCEAL
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syscon compat MAP_ANON 0x20 0x1000 0x0001000 0x1000 0x1000 0x20 # bsd consensus; faked nt
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@ -541,7 +540,7 @@ syscon sigact SA_NOCLDWAIT 2 32 32 32 32 2 # changes SIGCHLD so t
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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
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syscon sigact SA_ONSTACK 0x08000000 1 1 1 1 0x08000000 # causes signal handler to be called on stack provided by sigaltstack(2); bsd consensus
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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
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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
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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
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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
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syscon compat SA_NOMASK 0x40000000 16 16 16 16 0x40000000 # same as SA_NODEFER
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syscon compat SA_ONESHOT 0x80000000 4 4 4 4 0x80000000 # same as SA_RESETHAND
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@ -571,6 +570,7 @@ syscon sicode TRAP_BRKPT 1 1 1 1 1 1 # SIGTRAP; process breakpoin
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syscon sicode TRAP_TRACE 2 2 2 2 2 2 # SIGTRAP; process trace trap; unix consensus
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syscon sicode SEGV_MAPERR 1 1 1 1 1 1 # SIGSEGV; address not mapped to object; unix consensus
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syscon sicode SEGV_ACCERR 2 2 2 2 2 2 # SIGSEGV; invalid permissions for mapped object; unix consensus
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syscon sicode SEGV_PKUERR -1 -1 100 -1 -1 -1 # SIGSEGV: x86: PKU violation
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syscon sicode FPE_INTDIV 1 7 2 1 1 1 # SIGFPE; integer divide by zero
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syscon sicode FPE_INTOVF 2 8 1 2 2 2 # SIGFPE; integer overflow
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syscon sicode FPE_FLTDIV 3 1 3 3 3 3 # SIGFPE; floating point divide by zero
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@ -590,6 +590,7 @@ syscon sicode ILL_BADSTK 8 8 8 8 8 8 # SIGILL; internal stack err
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syscon sicode BUS_ADRALN 1 1 1 1 1 1 # SIGBUS; invalid address alignment; unix consensus
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syscon sicode BUS_ADRERR 2 2 2 2 2 2 # SIGBUS; non-existent physical address; unix consensus
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syscon sicode BUS_OBJERR 3 3 3 3 3 3 # SIGBUS; object specific hardware error; unix consensus
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syscon sicode BUS_OOMERR -1 -1 100 -1 -1 -1 # SIGBUS; Non-standard: No memory.
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syscon sicode BUS_MCEERR_AR 4 0x80000000 0x80000000 0x80000000 0x80000000 0x80000000 # SIGBUS; Linux 2.6.32+
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syscon sicode BUS_MCEERR_AO 5 0x80000000 0x80000000 0x80000000 0x80000000 0x80000000 # SIGBUS; Linux 2.6.32+
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syscon sicode POLL_IN 1 1 1 1 1 1 # SIGIO; data input available; unix consensus
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2
libc/sysv/consts/BUS_OOMERR.S
Normal file
2
libc/sysv/consts/BUS_OOMERR.S
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@ -0,0 +1,2 @@
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#include "libc/sysv/consts/syscon.internal.h"
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.syscon sicode,BUS_OOMERR,-1,-1,100,-1,-1,-1
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@ -1,2 +1,2 @@
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#include "libc/sysv/consts/syscon.internal.h"
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.syscon mmap,MAP_CONCEAL,0,0,0,0x8000,0,0
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.syscon mmap,MAP_CONCEAL,0,0,0x0020000,0x8000,0x8000,0
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2
libc/sysv/consts/SEGV_PKUERR.S
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2
libc/sysv/consts/SEGV_PKUERR.S
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@ -0,0 +1,2 @@
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#include "libc/sysv/consts/syscon.internal.h"
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.syscon sicode,SEGV_PKUERR,-1,-1,100,-1,-1,-1
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@ -23,6 +23,7 @@ extern const long TRAP_BRKPT;
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extern const long TRAP_TRACE;
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extern const long SEGV_MAPERR;
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extern const long SEGV_ACCERR;
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extern const long SEGV_PKUERR;
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extern const long FPE_INTDIV;
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extern const long FPE_INTOVF;
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extern const long FPE_FLTDIV;
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@ -44,6 +45,7 @@ extern const long BUS_ADRERR;
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extern const long BUS_OBJERR;
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extern const long BUS_MCEERR_AR;
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extern const long BUS_MCEERR_AO;
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extern const long BUS_OOMERR;
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extern const long POLL_IN;
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extern const long POLL_OUT;
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extern const long POLL_MSG;
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@ -87,6 +89,7 @@ COSMOPOLITAN_C_END_
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#define SI_ASYNCNL SYMBOLIC(SI_ASYNCNL)
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#define SI_KERNEL SYMBOLIC(SI_KERNEL)
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#define SI_NOINFO SYMBOLIC(SI_NOINFO)
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#define SEGV_PKUERR SYMBOLIC(SEGV_PKUERR)
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#define FPE_INTDIV SYMBOLIC(FPE_INTDIV)
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#define FPE_INTOVF SYMBOLIC(FPE_INTOVF)
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#define FPE_FLTDIV SYMBOLIC(FPE_FLTDIV)
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@ -99,6 +102,7 @@ COSMOPOLITAN_C_END_
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#define ILL_ILLADR SYMBOLIC(ILL_ILLADR)
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#define ILL_ILLTRP SYMBOLIC(ILL_ILLTRP)
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#define ILL_PRVOPC SYMBOLIC(ILL_PRVOPC)
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#define BUS_OOMERR SYMBOLIC(BUS_OOMERR)
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#define BUS_MCEERR_AR SYMBOLIC(BUS_MCEERR_AR)
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#define BUS_MCEERR_AO SYMBOLIC(BUS_MCEERR_AO)
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@ -360,7 +360,7 @@ _init_systemfive_stack:
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mov __NR_mmap,%eax
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movabs $ape_stack_vaddr,%rdi
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mov $ape_stack_memsz,%esi
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mov $PROT_READ|PROT_WRITE,%edx
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mov $ape_stack_prot,%edx
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mov $MAP_PRIVATE|MAP_FIXED,%r10d
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or MAP_ANONYMOUS,%r10d
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or $-1,%r8d
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@ -548,6 +548,7 @@ syscon_windows:/*
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.previous
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#endif /* DEBUGSYS */
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.weak ape_stack_prot
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.weak ape_stack_vaddr
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.weak ape_stack_memsz
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.weak ape_stack_align
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