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Overhaul process spawning

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Justine Tunney 2023-09-10 08:12:43 -07:00
parent 99dc1281f5
commit 26e254fb4d
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GPG key ID: BE714B4575D6E328
96 changed files with 1848 additions and 1541 deletions
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18
libc/calls/sigaltstack.c
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@ -59,21 +59,14 @@ static void sigaltstack2linux(struct sigaltstack *linux,
* struct sigaction sa;
* struct sigaltstack ss;
* ss.ss_flags = 0;
* ss.ss_sp = NewCosmoStack();
* ss.ss_size = GetStackSize();
* ss.ss_sp = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE,
* MAP_STACK | MAP_ANONYMOUS, -1, 0);
* sigaltstack(&ss, 0);
* sigemptyset(&sa.ss_mask);
* sa.sa_flags = SA_ONSTACK;
* sa.sa_handler = OnStackOverflow;
* __cxa_atexit(free, ss[0].ss_sp, 0);
* sigemptyset(&sa.ss_mask);
* sigaltstack(&ss, 0);
* sigaction(SIGSEGV, &sa, 0);
*
* It's strongly recommended that you allocate a stack with the same
* size as GetStackSize() and that it have GetStackSize() alignment.
* Otherwise some of your runtime support code (e.g. ftrace stack use
* logging, kprintf() memory safety) won't be able to work as well.
*
* @param neu if non-null will install new signal alt stack
* @param old if non-null will receive current signal alt stack
* @return 0 on success, or -1 w/ errno
@ -85,9 +78,8 @@ int sigaltstack(const struct sigaltstack *neu, struct sigaltstack *old) {
void *b;
const void *a;
struct sigaltstack_bsd bsd;
if (IsAsan() && ((old && __asan_check(old, sizeof(*old)).kind) ||
(neu && (__asan_check(neu, sizeof(*neu)).kind ||
__asan_check(neu->ss_sp, neu->ss_size).kind)))) {
if (IsAsan() && ((old && !__asan_is_valid(old, sizeof(*old))) ||
(neu && !__asan_is_valid(neu, sizeof(*neu))))) {
rc = efault();
} else if (neu && neu->ss_size < MINSIGSTKSZ) {
rc = enomem();