[Sanitizers] Intercept timer_create

compiler-rt/lib/hwasan/hwasan_platform_interceptors.h

@@ -200,6 +200,9 @@
 #undef SANITIZER_INTERCEPT_CLOCK_GETCPUCLOCKID
 #define SANITIZER_INTERCEPT_CLOCK_GETCPUCLOCKID 0
 
+#undef SANITIZER_INTERCEPT_TIMER_CREATE
+#define SANITIZER_INTERCEPT_TIMER_CREATE 0
+
 #undef SANITIZER_INTERCEPT_GETITIMER
 #define SANITIZER_INTERCEPT_GETITIMER 0
 

compiler-rt/lib/msan/tests/msan_test.cpp

@@ -4881,4 +4881,26 @@ TEST(MemorySanitizer, throw_catch) {
     // pass
   }
 }
+
+#if defined(__linux__)
+TEST(MemorySanitizer, timer_create) {
+  timer_t timer;
+  EXPECT_POISONED(timer);
+  int res = timer_create(CLOCK_REALTIME, nullptr, &timer);
+  ASSERT_EQ(0, res);
+  EXPECT_NOT_POISONED(timer);
+
+  // Make sure the timer is usable.
+  struct itimerspec cur_value{};
+  cur_value.it_value.tv_sec = 1;
+  EXPECT_EQ(0, timer_settime(timer, 0, &cur_value, nullptr));
+
+  timer_t timer2;
+  EXPECT_POISONED(timer2);
+  // Use an invalid clock_id to make timer_create fail.
+  res = timer_create(INT_MAX, nullptr, &timer2);
+  ASSERT_EQ(-1, res);
+  EXPECT_POISONED(timer2);
+}
+#endif
 } // namespace

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

@@ -2289,6 +2289,24 @@ INTERCEPTOR(int, pthread_getcpuclockid, uptr thread,
 #define INIT_CLOCK_GETCPUCLOCKID
 #endif
 
+#if SANITIZER_INTERCEPT_TIMER_CREATE
+INTERCEPTOR(int, timer_create, __sanitizer_clockid_t clockid, void *sevp,
+            __sanitizer_timer_t *timer) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, timer_create, clockid, sevp, timer);
+  int res = REAL(timer_create)(clockid, sevp, timer);
+  if (!res && timer) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, timer, sizeof *timer);
+  }
+  return res;
+}
+
+#  define INIT_TIMER_CREATE \
+    COMMON_INTERCEPT_FUNCTION_GLIBC_VER_MIN(timer_create, "GLIBC_2.3.3");
+#else
+#  define INIT_TIMER_CREATE
+#endif
+
 #if SANITIZER_INTERCEPT_GETITIMER
 INTERCEPTOR(int, getitimer, int which, void *curr_value) {
   void *ctx;
@@ -10266,6 +10284,7 @@ static void InitializeCommonInterceptors() {
   INIT_SETPWENT;
   INIT_CLOCK_GETTIME;
   INIT_CLOCK_GETCPUCLOCKID;
+  INIT_TIMER_CREATE;
   INIT_GETITIMER;
   INIT_TIME;
   INIT_GLOB;

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -237,6 +237,9 @@
   (SI_FREEBSD || SI_NETBSD || SI_LINUX || SI_SOLARIS)
 #define SANITIZER_INTERCEPT_CLOCK_GETCPUCLOCKID \
   (SI_LINUX || SI_FREEBSD || SI_NETBSD)
+// TODO: This should be SI_POSIX, adding Linux first until I have time
+// to verify all timer_t typedefs on other platforms.
+#define SANITIZER_INTERCEPT_TIMER_CREATE SI_LINUX
 #define SANITIZER_INTERCEPT_GETITIMER SI_POSIX
 #define SANITIZER_INTERCEPT_TIME SI_POSIX
 #define SANITIZER_INTERCEPT_GLOB (SI_GLIBC || SI_SOLARIS)

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h

@@ -1517,6 +1517,10 @@ extern const int si_SEGV_ACCERR;
 
 #define SIGACTION_SYMNAME sigaction
 
+#  if SANITIZER_LINUX
+typedef void *__sanitizer_timer_t;
+#  endif
+
 #endif  // SANITIZER_LINUX || SANITIZER_APPLE
 
 #endif