[compiler-rt] [compiler-rt][rtsan] fopencookie support. (PR #120864)

[David CARLIER via llvm-commits]

https://github.com/devnexen updated https://github.com/llvm/llvm-project/pull/120864

>From 9c46d95e8403fae209c00c7284e63333924b9de0 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen at gmail.com>
Date: Sun, 22 Dec 2024 00:14:06 +0000
Subject: [PATCH] [compiler-rt][rtsan] fopencookie support.

---
 .../lib/rtsan/rtsan_interceptors_posix.cpp    |  7 ++++++
 .../tests/rtsan_test_interceptors_posix.cpp   | 23 +++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
index 4e51f464b57304..072923ab35ae0d 100644
--- a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
@@ -297,6 +297,12 @@ INTERCEPTOR(FILE *, fdopen, int fd, const char *mode) {
   return REAL(fdopen)(fd, mode);
 }
 
+INTERCEPTOR(FILE *, fopencookie, void *cookie, const char *mode,
+            cookie_io_functions_t funcs) {
+  __rtsan_notify_intercepted_call("fopencookie");
+  return REAL(fopencookie)(cookie, mode, funcs);
+}
+
 #if SANITIZER_INTERCEPT_OPEN_MEMSTREAM
 INTERCEPTOR(FILE *, open_memstream, char **buf, size_t *size) {
   __rtsan_notify_intercepted_call("open_memstream");
@@ -972,6 +978,7 @@ void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(fputs);
   INTERCEPT_FUNCTION(fdopen);
   INTERCEPT_FUNCTION(freopen);
+  INTERCEPT_FUNCTION(fopencookie);
   RTSAN_MAYBE_INTERCEPT_OPEN_MEMSTREAM;
   RTSAN_MAYBE_INTERCEPT_FMEMOPEN;
   INTERCEPT_FUNCTION(lseek);
diff --git a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
index b052dd859dcdf6..c9c4d7fc4e99ee 100644
--- a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
@@ -353,6 +353,29 @@ TEST_F(RtsanFileTest, FopenDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
+TEST_F(RtsanFileTest, FopenCookieDieWhenRealtime) {
+  FILE *f = fopen(GetTemporaryFilePath(), "w");
+  EXPECT_THAT(f, Ne(nullptr));
+  struct fholder {
+    FILE *fp;
+    size_t read;
+  } fh = {f, 0};
+  auto CookieRead = [this](void *cookie, char *buf, size_t size) {
+    fholder *p = reinterpret_cast<fholder *>(cookie);
+    p->read = fread(static_cast<void *>(buf), 1, size, p->fp);
+    EXPECT_NE(0, p->read);
+  };
+  cookie_io_functions_t funcs = {(cookie_read_function_t *)&CookieRead, nullptr,
+                                 nullptr, nullptr};
+  auto Func = [&fh, &funcs]() {
+    FILE *f = fopencookie(&fh, "w", funcs);
+    EXPECT_THAT(f, Ne(nullptr));
+  };
+
+  ExpectRealtimeDeath(Func, "fopencookie");
+  ExpectNonRealtimeSurvival(Func);
+}
+
 #if SANITIZER_INTERCEPT_OPEN_MEMSTREAM
 TEST_F(RtsanFileTest, OpenMemstreamDiesWhenRealtime) {
   char *buffer;