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

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Merged
merged 1 commit into from
Mar 23, 2025
Merged

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

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12 changes: 12 additions & 0 deletions compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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) {
Expand Down Expand Up @@ -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;

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8 changes: 8 additions & 0 deletions compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
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Expand Up @@ -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
*/
Expand Down