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[compiler-rt][rtsan] symlink/symlinkat interception. #134168

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Merged
merged 1 commit into from
Apr 5, 2025
Merged

[compiler-rt][rtsan] symlink/symlinkat interception. #134168

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13 changes: 13 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 @@ -322,6 +322,17 @@ INTERCEPTOR(int, ftruncate64, int fd, off64_t length) {
#define RTSAN_MAYBE_INTERCEPT_FTRUNCATE64
#endif

INTERCEPTOR(int, symlink, const char *target, const char *linkpath) {
__rtsan_notify_intercepted_call("symlink");
return REAL(symlink)(target, linkpath);
}

INTERCEPTOR(int, symlinkat, const char *target, int newdirfd,
const char *linkpath) {
__rtsan_notify_intercepted_call("symlinkat");
return REAL(symlinkat)(target, newdirfd, linkpath);
}

// Streams

INTERCEPTOR(FILE *, fopen, const char *path, const char *mode) {
Expand Down Expand Up @@ -1515,6 +1526,8 @@ void __rtsan::InitializeInterceptors() {
RTSAN_MAYBE_INTERCEPT_READLINKAT;
INTERCEPT_FUNCTION(unlink);
INTERCEPT_FUNCTION(unlinkat);
INTERCEPT_FUNCTION(symlink);
INTERCEPT_FUNCTION(symlinkat);
INTERCEPT_FUNCTION(truncate);
INTERCEPT_FUNCTION(ftruncate);
RTSAN_MAYBE_INTERCEPT_TRUNCATE64;
Expand Down
16 changes: 16 additions & 0 deletions compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
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Expand Up @@ -896,6 +896,22 @@ TEST_F(RtsanOpenedFileTest, FtruncateDiesWhenRealtime) {
ExpectNonRealtimeSurvival(Func);
}

TEST_F(RtsanOpenedFileTest, SymlinkDiesWhenRealtime) {
auto Func = [&]() {
symlink("/tmp/rtsan_symlink_test", GetTemporaryFilePath());
};
ExpectRealtimeDeath(Func, "symlink");
ExpectNonRealtimeSurvival(Func);
}

TEST_F(RtsanOpenedFileTest, SymlinkatDiesWhenRealtime) {
auto Func = [&]() {
symlinkat("/tmp/rtsan_symlinkat_test", AT_FDCWD, GetTemporaryFilePath());
};
ExpectRealtimeDeath(Func, "symlinkat");
ExpectNonRealtimeSurvival(Func);
}

TEST_F(RtsanFileTest, FcloseDiesWhenRealtime) {
FILE *f = fopen(GetTemporaryFilePath(), "w");
EXPECT_THAT(f, Ne(nullptr));
Expand Down