src: reset SIGSEGV handler before crashing

Without this, we would re-enter the signal handler immediately
after re-raising the signal, leading to an infinite loop.

PR-URL: https://github.com/nodejs/node/pull/27775
Refs: https://github.com/nodejs/node/pull/27246
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/node_process_methods.cc b/src/node_process_methods.cc
index a9ddd70bcb..912ac9bec2 100644
--- a/src/node_process_methods.cc
+++ b/src/node_process_methods.cc
@@ -63,6 +63,12 @@ static void Abort(const FunctionCallbackInfo<Value>& args) {
   Abort();
 }
 
+// For internal testing only, not exposed to userland.
+static void CauseSegfault(const FunctionCallbackInfo<Value>& args) {
+  // This should crash hard all platforms.
+  *static_cast<void**>(nullptr) = nullptr;
+}
+
 static void Chdir(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   CHECK(env->owns_process_state());
@@ -405,6 +411,7 @@ static void InitializeProcessMethods(Local<Object> target,
     env->SetMethod(target, "_debugProcess", DebugProcess);
     env->SetMethod(target, "_debugEnd", DebugEnd);
     env->SetMethod(target, "abort", Abort);
+    env->SetMethod(target, "causeSegfault", CauseSegfault);
     env->SetMethod(target, "chdir", Chdir);
   }