Add a check that sanitizers cause a fatal failure

webrtc/rtc_tools/sanitizers_unittest.cc

Index: webrtc/rtc_tools/sanitizers_unittest.cc
diff --git a/webrtc/rtc_tools/sanitizers_unittest.cc b/webrtc/rtc_tools/sanitizers_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..74cb081efa8337e5ce5ee07695791b750a7276fb
--- /dev/null
+++ b/webrtc/rtc_tools/sanitizers_unittest.cc
@@ -0,0 +1,121 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <random>
+
+#include "webrtc/rtc_base/checks.h"
+#include "webrtc/rtc_base/nullsocketserver.h"
+#include "webrtc/rtc_base/ptr_util.h"
+#include "webrtc/rtc_base/thread.h"
+#include "webrtc/test/gtest.h"
+
+namespace rtc {
+
+namespace {
+
+#if defined(MEMORY_SANITIZER)
+void UseOfUninitializedValue() {
+  int* buf = new int[2];
+  std::random_device engine;
+  if (buf[engine() % 2]) {  // Non-deterministic conditional.
+    printf("Externally visible action.");
+  }
+  delete[] buf;
+}
+
+TEST(SanitizersDeathTest, MemorySanitizer) {
+  EXPECT_DEATH(UseOfUninitializedValue(), "use-of-uninitialized-value");
+}
+#endif
+
+#if defined(ADDRESS_SANITIZER)
+void HeapUseAfterFree() {
+  char *buf = new char[2];
+  delete[] buf;
+  buf[0] = buf[1];
+}
+
+TEST(SanitizersDeathTest, AddressSanitizer) {
+  EXPECT_DEATH(HeapUseAfterFree(), "heap-use-after-free");
+}
+#endif
+
+#if defined(UNDEFINED_SANITIZER)
+// For ubsan:
+void SignedIntegerOverflow() {
+  int32_t x = 1234567890;
+  x *= 2;
+}
+
+// For ubsan_vptr:
+struct Base {
+  virtual void f() {}
+  virtual ~Base() {}
+};
+struct Derived : public Base {
+};
+
+void InvalidVptr() {
+  Base b;
+  auto* d = static_cast<Derived*>(&b);  // Bad downcast.
+  d->f();  // Virtual function call with object of wrong dynamic type.
+}
+
+TEST(SanitizersDeathTest, UndefinedSanitizer) {
+  EXPECT_DEATH({ SignedIntegerOverflow(); InvalidVptr(); }, "runtime error");
+}
+#endif
+
+#if defined(THREAD_SANITIZER)
+class IncrementThread : public Thread {
+ public:
+  explicit IncrementThread(int* value)
+      : Thread(rtc::MakeUnique<NullSocketServer>()),
+        value_(value) {}
+
+  void Run() override {
+    ++*value_;
+    Thread::Current()->SleepMs(100);
+  }
+
+  // Un-protect Thread::Join for the test.
+  void Join() {
+    Thread::Join();
+  }
+
+ private:
+  int* value_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(IncrementThread);
+};
+
+void DataRace() {
+  int value = 0;
+  IncrementThread thread1(&value);
+  IncrementThread thread2(&value);
+  thread1.Start();
+  thread2.Start();
+  thread1.Join();
+  thread2.Join();
+  // TSan seems to mess with gtest's death detection.
+  // Fail intentionally, and rely on detecting the error message.
+  RTC_CHECK(false);
+}
+
+TEST(SanitizersDeathTest, ThreadSanitizer) {
+  EXPECT_DEATH(DataRace(), "data race");
+}
+#endif
+
+}  // namespace
+
+}  // namespace rtc