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Backup and restore signal stack

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This commit is contained in:
Jean-André Santoni
2026-05-21 10:14:41 +02:00
parent 8a69472153
commit 00b18e9f15
1 changed files with 10 additions and 4 deletions
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Common/ExceptionHandlerSetup.cpp
+10 -4
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@@ -222,6 +222,8 @@ void UninstallExceptionHandler() {
static struct sigaction old_sa_segv;
static struct sigaction old_sa_bus;
static stack_t old_signal_stack{};
static bool old_signal_stack_valid = false;
static void sigsegv_handler(int sig, siginfo_t* info, void* raw_context) {
if (sig != SIGSEGV && sig != SIGBUS) {
@@ -298,6 +300,9 @@ void InstallExceptionHandler(BadAccessHandler badAccessHandler) {
g_badAccessHandler = badAccessHandler;
stack_t signal_stack{};
if (sigaltstack(nullptr, &old_signal_stack) == 0) {
old_signal_stack_valid = true;
}
altStack = malloc(altStackSize);
#ifdef __FreeBSD__
signal_stack.ss_sp = (char*)altStack;
@@ -324,10 +329,11 @@ void UninstallExceptionHandler() {
if (!g_badAccessHandler) {
return;
}
stack_t signal_stack{};
signal_stack.ss_flags = SS_DISABLE;
if (0 != sigaltstack(&signal_stack, nullptr)) {
ERROR_LOG(Log::System, "Could not remove signal altstack");
if (old_signal_stack_valid) {
if (0 != sigaltstack(&old_signal_stack, nullptr)) {
ERROR_LOG(Log::System, "Could not restore previous signal altstack");
}
old_signal_stack_valid = false;
}
if (altStack) {
free(altStack);