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

cwallez: Would you mind taking a look at this? Also, could you let us know if earlier versions are affected since it seems like we started hitting this after a fuzzer change? We'll want to update the impact/milestone/releaseblock labels if so.

Assigning to capn@. The issue certainly predates the fuzzer.

This is an issue in the constant folding of the GLSL compiler, which is old code. It only affects the GPU process, so its security implications are minimal. We'll look into this and related bugs when revamping the compiler.

ClusterFuzz has detected this issue as fixed in range 521502:521564.

Detailed report: https://clusterfuzz.com/testcase?key=6319256064229376

Fuzzer: libFuzzer_swiftshader_vertex_routine_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: Heap-buffer-overflow READ 4
Crash Address: 0x62500007c900
Crash State:
  getIConst
  TIntermConstantUnion::fold
  TIntermediate::addBinaryMath
  
Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=512583:512623
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=521502:521564

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6319256064229376

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md 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 6319256064229376 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