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Improve stack overflow recovery

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It's now possible to use sigaltstack() to recover from stack overflows
on Windows. Several bugs in sigaltstack() have been fixed, for all our
supported platforms. There's a newer better example showing how to use
this, along with three independent unit tests just to further showcase
the various techniques.
This commit is contained in:
Justine Tunney 2023-10-04 07:07:43 -07:00
parent 1694edf85c
commit 4631d34d0d
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GPG key ID: BE714B4575D6E328
24 changed files with 590 additions and 274 deletions
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7
libc/calls/pledge.c
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@ -239,9 +239,6 @@
int pledge(const char *promises, const char *execpromises) {
int e, rc;
unsigned long ipromises, iexecpromises;
if (promises && !execpromises) {
execpromises = promises;
}
if (!promises) {
// OpenBSD says NULL argument means it doesn't change, i.e.
// pledge(0,0) on OpenBSD does nothing. The Cosmopolitan Libc
@ -262,8 +259,8 @@ int pledge(const char *promises, const char *execpromises) {
return -1;
} else if (!IsTiny() && IsGenuineBlink()) {
rc = 0; // blink doesn't support seccomp; avoid noisy log warnings
} else if (!ParsePromises(promises, &ipromises) &&
!ParsePromises(execpromises, &iexecpromises)) {
} else if (!ParsePromises(promises, &ipromises, __promises) &&
!ParsePromises(execpromises, &iexecpromises, __execpromises)) {
if (IsLinux()) {
// copy exec and execnative from promises to execpromises
iexecpromises = ~(~iexecpromises | (~ipromises & (1ul << PROMISE_EXEC)));