[compiler-rt][rtsan] Linux's eventfd interception.

[devnexen]

No description provided.

[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: David CARLIER (devnexen)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/132836.diff

2 Files Affected:

• (modified) compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp (+9)
• (modified) compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp (+7)

diff --git a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
index 9d1a689a5a070..aed43fcd92249 100644
--- a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
@@ -1359,6 +1359,12 @@ INTERCEPTOR(int, timerfd_gettime, int fd, struct itimerspec *val) {
   __rtsan_notify_intercepted_call("timerfd_gettime");
   return REAL(timerfd_gettime)(fd, val);
 }
+
+/* eventfd wrappers calls SYS_eventfd2 down the line */
+INTERCEPTOR(int, eventfd, unsigned int count, int flags) {
+  __rtsan_notify_intercepted_call("eventfd");
+  return REAL(eventfd)(count, flags);
+}
 #define RTSAN_MAYBE_INTERCEPT_INOTIFY_INIT INTERCEPT_FUNCTION(inotify_init)
 #define RTSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 INTERCEPT_FUNCTION(inotify_init1)
 #define RTSAN_MAYBE_INTERCEPT_INOTIFY_ADD_WATCH                                \
@@ -1370,6 +1376,7 @@ INTERCEPTOR(int, timerfd_gettime, int fd, struct itimerspec *val) {
   INTERCEPT_FUNCTION(timerfd_settime)
 #define RTSAN_MAYBE_INTERCEPT_TIMERFD_GETTIME                                  \
   INTERCEPT_FUNCTION(timerfd_gettime)
+#define RTSAN_MAYBE_INTERCEPT_EVENTFD INTERCEPT_FUNCTION(eventfd)
 #else
 #define RTSAN_MAYBE_INTERCEPT_INOTIFY_INIT
 #define RTSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
@@ -1378,6 +1385,7 @@ INTERCEPTOR(int, timerfd_gettime, int fd, struct itimerspec *val) {
 #define RTSAN_MAYBE_INTERCEPT_TIMERFD_CREATE
 #define RTSAN_MAYBE_INTERCEPT_TIMERFD_SETTIME
 #define RTSAN_MAYBE_INTERCEPT_TIMERFD_GETTIME
+#define RTSAN_MAYBE_INTERCEPT_EVENTFD
 #endif
 
 INTERCEPTOR(int, pipe, int pipefd[2]) {
@@ -1644,6 +1652,7 @@ void __rtsan::InitializeInterceptors() {
   RTSAN_MAYBE_INTERCEPT_TIMERFD_CREATE;
   RTSAN_MAYBE_INTERCEPT_TIMERFD_SETTIME;
   RTSAN_MAYBE_INTERCEPT_TIMERFD_GETTIME;
+  RTSAN_MAYBE_INTERCEPT_EVENTFD;
 
   INTERCEPT_FUNCTION(pipe);
   INTERCEPT_FUNCTION(mkfifo);
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 f12df9ea90855..3a43f4f9c434c 100644
--- a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
@@ -44,6 +44,7 @@
 #include <pthread.h>
 #include <stdio.h>
 #if SANITIZER_LINUX
+#include <sys/eventfd.h>
 #include <sys/inotify.h>
 #include <sys/timerfd.h>
 #endif
@@ -1677,6 +1678,12 @@ TEST(TestRtsanInterceptors, TimerfdGettimeDiesWhenRealtime) {
   ExpectRealtimeDeath(Func, "timerfd_gettime");
   ExpectNonRealtimeSurvival(Func);
 }
+
+TEST(TestRtsanInterceptors, EventfdDiesWhenRealtime) {
+  auto Func = []() { eventfd(EFD_CLOEXEC, 0); };
+  ExpectRealtimeDeath(Func, "eventfd");
+  ExpectNonRealtimeSurvival(Func);
+}
 #endif
 
 TEST(TestRtsanInterceptors, MkfifoDiesWhenRealtime) {