[compiler-rt][rtsan] memffd_create for linux interception. (#132571)

Author: devnexen

compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp

@@ -1031,6 +1031,17 @@ INTERCEPTOR(int, shm_unlink, const char *name) {
   return REAL(shm_unlink)(name);
 }
 
+#if !SANITIZER_APPLE
+// is supported by freebsd too
+INTERCEPTOR(int, memfd_create, const char *path, unsigned int flags) {
+  __rtsan_notify_intercepted_call("memfd_create");
+  return REAL(memfd_create)(path, flags);
+}
+#define RTSAN_MAYBE_INTERCEPT_MEMFD_CREATE INTERCEPT_FUNCTION(memfd_create)
+#else
+#define RTSAN_MAYBE_INTERCEPT_MEMFD_CREATE
+#endif
+
 // Sockets
 INTERCEPTOR(int, getaddrinfo, const char *node, const char *service,
             const struct addrinfo *hints, struct addrinfo **res) {
@@ -1465,6 +1476,7 @@ void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(mincore);
   INTERCEPT_FUNCTION(shm_open);
   INTERCEPT_FUNCTION(shm_unlink);
+  RTSAN_MAYBE_INTERCEPT_MEMFD_CREATE;
   RTSAN_MAYBE_INTERCEPT_MEMALIGN;
   RTSAN_MAYBE_INTERCEPT_PVALLOC;
 

compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp

@@ -302,6 +302,14 @@ TEST(TestRtsanInterceptors, ShmUnlinkDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
+#if !SANITIZER_APPLE
+TEST(TestRtsanInterceptors, MemfdCreateDiesWhenRealtime) {
+  auto Func = []() { memfd_create("/rtsan_test_memfd_create", MFD_CLOEXEC); };
+  ExpectRealtimeDeath(Func, "memfd_create");
+  ExpectNonRealtimeSurvival(Func);
+}
+#endif
+
 /*
     Sleeping
 */