Move UBSan warnings from a blacklist to the source

webrtc/rtc_base/random_unittest.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
@@ skipping 181 matching lines @@
   BucketTestUnsignedInterval(7, 100000, 1, 14, 3, &prng);
   BucketTestUnsignedInterval(11, 100000, 1000, 1010, 3, &prng);
   BucketTestUnsignedInterval(100, 100000, 0, 99, 3, &prng);
   BucketTestUnsignedInterval(2, 100000, 0, 4294967295, 3, &prng);
   BucketTestUnsignedInterval(17, 100000, 455, 2147484110, 3, &prng);
   // 99.7% of all samples will be within 3 standard deviations of the mean,
   // but since we test 1000 buckets we allow an interval of 4 sigma.
   BucketTestUnsignedInterval(1000, 1000000, 0, 2147483999, 4, &prng);
 }
 
-// Disabled for UBSan: https://bugs.chromium.org/p/webrtc/issues/detail?id=5491
-#ifdef UNDEFINED_SANITIZER
-#define MAYBE_UniformSignedInterval DISABLED_UniformSignedInterval
-#else
-#define MAYBE_UniformSignedInterval UniformSignedInterval
-#endif
-TEST(RandomNumberGeneratorTest, MAYBE_UniformSignedInterval) {
+TEST(RandomNumberGeneratorTest, UniformSignedInterval) {
   Random prng(66260695729ull);
   BucketTestSignedInterval(2, 100000, 0, 1, 3, &prng);
   BucketTestSignedInterval(7, 100000, -2, 4, 3, &prng);
   BucketTestSignedInterval(11, 100000, 1000, 1010, 3, &prng);
   BucketTestSignedInterval(100, 100000, 0, 99, 3, &prng);
   BucketTestSignedInterval(2, 100000, std::numeric_limits<int32_t>::min(),
                            std::numeric_limits<int32_t>::max(), 3, &prng);
   BucketTestSignedInterval(17, 100000, -1073741826, 1073741829, 3, &prng);
   // 99.7% of all samples will be within 3 standard deviations of the mean,
   // but since we test 1000 buckets we allow an interval of 4 sigma.
@@ skipping 81 matching lines @@
     double f_mid = kScale * exp((n - kMean) * (n - kMean) / kDiv);
     double f_right = kScale * exp((n - kMean + 0.5) * (n - kMean + 0.5) / kDiv);
     double normal_dist = (f_left + 4 * f_mid + f_right) / 6;
     // Expect the number of samples to be within 3 standard deviations
     // (rounded up) of the expected number of samples in the bucket.
     EXPECT_NEAR(buckets[n], kN * normal_dist, 3 * sqrt(kN * normal_dist) + 1);
   }
 }
 
 }  // namespace webrtc