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wip: initial working on macOS

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This commit is contained in:
Matthew LeVan 2024-02-17 17:27:13 -08:00
parent f12337e620
commit 45f47e069f
1 changed files with 43 additions and 24 deletions
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67
rust/ares_guard/c-src/guard.c
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@ -19,7 +19,8 @@ static uintptr_t guard_p = 0;
static const uintptr_t *stack_pp = NULL;
static const uintptr_t *alloc_pp = NULL;
static GD_buflistnode *buffer_list = NULL;
static struct sigaction prev_sa;
static struct sigaction prev_sigsegv_sa;
static struct sigaction prev_sigbus_sa;
static guard_result
_prot_page(void *address, int prot)
@ -110,8 +111,8 @@ _signal_handler(int sig, siginfo_t *si, void *unused)
// fprintf(stderr, "guard: handler: %d received\r\n", sig);
if (sig != SIGSEGV) {
fprintf(stderr, "guard: handler: invalid signal\r\n");
if (sig != SIGSEGV && sig != SIGBUS) {
fprintf(stderr, "guard: handler: invalid signal: %d\r\n", sig);
assert(0);
}
@ -130,14 +131,26 @@ _signal_handler(int sig, siginfo_t *si, void *unused)
}
else {
// fprintf(stderr, "guard: page at %p miss\r\n", (void *)guard_p);
if (prev_sa.sa_sigaction != NULL) {
prev_sa.sa_sigaction(sig, si, unused);
} else if (prev_sa.sa_handler != NULL) {
prev_sa.sa_handler(sig);
} else {
// There should always be a default SIGSEGV handler
assert(0);
switch (sig) {
case SIGSEGV: {
if (prev_sigsegv_sa.sa_sigaction != NULL) {
prev_sigsegv_sa.sa_sigaction(sig, si, unused);
} else if (prev_sigsegv_sa.sa_handler != NULL) {
prev_sigsegv_sa.sa_handler(sig);
} else {
assert(0);
}
break;
}
case SIGBUS: {
if (prev_sigbus_sa.sa_sigaction != NULL) {
prev_sigbus_sa.sa_sigaction(sig, si, unused);
} else if (prev_sigbus_sa.sa_handler != NULL) {
prev_sigbus_sa.sa_handler(sig);
} else {
assert(0);
}
}
}
}
}
@ -146,20 +159,17 @@ static guard_result
_register_handler()
{
struct sigaction sa;
// Flag to use sa_sigaction
sa.sa_flags = SA_SIGINFO;
// Must use sa_sigaction; sa-handler takes signal handler as its only argument
sa.sa_sigaction = _signal_handler;
// Set mask of signals to ignore while running signal handler
// TODO: By default the signal that triggered the signal handler is automatically added to the
// mask while it's being handled, so unless we plan to add more signals to this then I
// don't think it's necessary.
// sigemptyset(&sa.sa_mask);
// sigaddset(&(sa.sa_mask), SIGSEGV);
// XX: should assert that prev_sa is uninitialized, but it's not a pointer so non-trivial
if (sigaction(SIGSEGV, &sa, &prev_sa)) {
// XX should assert that prev_sigsegv_sa is uninitialized, but it's non-trivial
if (sigaction(SIGSEGV, &sa, &prev_sigsegv_sa)) {
fprintf(stderr, "guard: register: sigaction error\r\n");
fprintf(stderr, "%s\r\n", strerror(errno));
return guard_sigaction | errno;
}
if (sigaction(SIGBUS, &sa, &prev_sigbus_sa)) {
fprintf(stderr, "guard: register: sigaction error\r\n");
fprintf(stderr, "%s\r\n", strerror(errno));
return guard_sigaction | errno;
@ -228,8 +238,17 @@ guard(
skip:
// If no more guarded closures, then...
if (buffer_list == NULL) {
// Remove new signal handler
if (sigaction(SIGSEGV, &prev_sa, NULL)) {
// Remove new signal handlers
if (sigaction(SIGSEGV, &prev_sigsegv_sa, NULL)) {
fprintf(stderr, "guard: sigaction error\r\n");
fprintf(stderr, "%s\r\n", strerror(errno));
td_err = guard_sigaction | errno;
if (!err) {
err = td_err;
}
}
if (sigaction(SIGBUS, &prev_sigbus_sa, NULL)) {
fprintf(stderr, "guard: sigaction error\r\n");
fprintf(stderr, "%s\r\n", strerror(errno));
td_err = guard_sigaction | errno;