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.

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

sugoi: Can you please take a look and reassign as appropriate? Thanks.

It looks like this might be caused by enabling WebGL 2 for SwiftShader: https://chromium-review.googlesource.com/653499. This is an experiment which we intend to revert before M63 banches.

Alexis, could you have a look at why this crashes, and if no obvious bug is found revert WebGL 2 early to verify that this is what triggered it?

sugoi: Uh oh! This issue still open and hasn't been updated in the last 14 days. This is a serious vulnerability, and we want to ensure that there's progress. Could you please leave an update with the current status and any potential blockers?

If you're not the right owner for this issue, could you please remove yourself as soon as possible or help us find the right one?

If the issue is fixed or you can't reproduce it, please close the bug. If you've started working on a fix, please set the status to Started.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

The following revision refers to this bug:
  https://swiftshader.googlesource.com/SwiftShader.git/+/42e5303dcf62a82ab26142fa755ebd01992d0c1e

commit 42e5303dcf62a82ab26142fa755ebd01992d0c1e
Author: Alexis Hetu <sugoi@google.com>
Date: Tue Oct 03 20:04:31 2017

Fix for 3D texture sampling

3D texture sampling did not support width*height > MAX_USHORT(65535).
Changed for 32 bit integer computation for that multiplication to
solve this issue.

Verified with 3D texture related dEQP tests.

Bug b/26105892 chromium:763382

Change-Id: Ifd07278f6263d000620a0b525c07ed4fcbdcf2e7
Reviewed-on: https://swiftshader-review.googlesource.com/12988
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>

[modify] https://crrev.com/42e5303dcf62a82ab26142fa755ebd01992d0c1e/src/Shader/SamplerCore.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5955bc576d147925fb8966ca7b91a23f7c91591e

commit 5955bc576d147925fb8966ca7b91a23f7c91591e
Author: Alexis Hetu <sugoi@google.com>
Date: Wed Oct 04 01:03:13 2017

Roll SwiftShader bc6ce4f..9d56da2

https://swiftshader.googlesource.com/SwiftShader.git/+log/bc6ce4f..9d56da2

BUG= chromium:763382 , chromium:763384 , chromium:763435 , chromium:765094 , chromium:765791 , chromium:765939 

TBR=kbr@chromium.org

TEST=bots

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel,linux_chromium_cfi_rel_ng;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Change-Id: Idd52bdc26eba54615838baf5dc65705a8a4be631
Reviewed-on: https://chromium-review.googlesource.com/699156
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Reviewed-by: Alexis Hétu <sugoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506259}
[modify] https://crrev.com/5955bc576d147925fb8966ca7b91a23f7c91591e/DEPS

ClusterFuzz has detected this issue as fixed in range 506249:506277.

Detailed report: https://clusterfuzz.com/testcase?key=4722289303355392

Fuzzer: inferno_twister_c
Job Type: windows_asan_chrome_no_sandbox
Platform Id: windows

Crash Type: UNKNOWN READ
Crash Address: 0x25e4b110
Crash State:
  sw::Renderer::taskLoop
  sw::Renderer::threadLoop
  sw::Renderer::threadFunction
  
Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=windows_asan_chrome_no_sandbox&range=500358:500415
Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome_no_sandbox&range=506249:506277

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4722289303355392

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 4722289303355392 is verified as fixed, so closing issue as verified.

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

Both regressed and fixed in M63, removing ReleaseBlock-Stable

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