This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

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Regression range points to e8c9649e2570c7e278e70a6584738a3c3f828b2b.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/06f5f84656b9b976dedbca75b0d1c223c4d32709

commit 06f5f84656b9b976dedbca75b0d1c223c4d32709
Author: Peter Marshall <petermarshall@chromium.org>
Date: Wed Aug 09 14:48:54 2017

[runtime] Align Seq{One,Two}ByteString::kMaxSize.

Because SizeFor only returns aligned values, when we check values
returned there against kMaxSize, they can be larger if they were
rounded up.

It wasn't possible to write a test for the 2-byte version that didn't
regularly OOM.

Bug:  chromium:752764 
Change-Id: Id2f387449e0fafe633a2fde1ac728be31487f62d
Reviewed-on: https://chromium-review.googlesource.com/607935
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47252}
[modify] https://crrev.com/06f5f84656b9b976dedbca75b0d1c223c4d32709/src/objects/string.h
[modify] https://crrev.com/06f5f84656b9b976dedbca75b0d1c223c4d32709/test/mjsunit/mjsunit.status
[add] https://crrev.com/06f5f84656b9b976dedbca75b0d1c223c4d32709/test/mjsunit/regress/regress-752764.js

ClusterFuzz has detected this issue as fixed in range 47251:47252.

Detailed report: https://clusterfuzz.com/testcase?key=6138077579051008

Fuzzer: inferno_js_fuzzer
Job Type: linux_asan_d8_dbg
Platform Id: linux

Crash Type: DCHECK failure
Crash Address: 
Crash State:
  size <= SeqOneByteString::kMaxSize in heap.cc
  v8::internal::Heap::AllocateRawOneByteString
  v8::internal::Factory::NewRawOneByteString
  
Sanitizer: address (ASAN)

Regressed: V8: 46837:46838
Fixed: V8: 47251:47252

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6138077579051008

See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 6138077579051008 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot