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

Speculatively assign to geofflang@chromium.org.

geofflang@, could you see if this is related to
https://chromium.googlesource.com/angle/angle.git/+/4f0e003e5739e369aec2ed8c5eecf78052ab5650 ?
If not, please help us find the right owner of this issue.  Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/angle/angle/+/3847f94d17231889ef1c39f6a5a411130d2cfb30

commit 3847f94d17231889ef1c39f6a5a411130d2cfb30
Author: Geoff Lang <geofflang@chromium.org>
Date: Wed Jul 12 15:17:28 2017

Validate that the mip level is not too large for CopyTextureCHROMIUM.

When the mip level was greater than the maximum, it could cause an
out-of-bounds read when trying to query the Texture's size and format
later in the validation.

BUG= 740426 

Change-Id: Ibd6c977981e5f8b7368c161b7969d9e916c6095b

[modify] https://crrev.com/3847f94d17231889ef1c39f6a5a411130d2cfb30/src/libANGLE/validationES2.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4939be8f314a0138d711da73ebe47da8a60ec110

commit 4939be8f314a0138d711da73ebe47da8a60ec110
Author: Geoff Lang <geofflang@chromium.org>
Date: Thu Jul 13 16:55:48 2017

Roll ANGLE 70c95fa..3ec7568

https://chromium.googlesource.com/angle/angle.git/+log/70c95fa..3ec7568

BUG=:angleproject:2101,740426

TBR=cwallez@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;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Change-Id: I302d09829846c705e5e337ff071098fc91bc96e5
Reviewed-on: https://chromium-review.googlesource.com/570379
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486413}
[modify] https://crrev.com/4939be8f314a0138d711da73ebe47da8a60ec110/DEPS

ClusterFuzz has detected this issue as fixed in range 486405:486474.

Detailed report: https://clusterfuzz.com/testcase?key=4602300000894976

Fuzzer: libFuzzer_gpu_angle_passthrough_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: Heap-buffer-overflow READ 4
Crash Address: 0x615000004880
Crash State:
  gl::Texture::getWidth
  gl::ValidateCopyTextureCHROMIUM
  gl::CopyTextureCHROMIUM
  
Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=474850:474888
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=486405:486474

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4602300000894976


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.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 4602300000894976 is verified as fixed, so closing issue.

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

This bug requires manual review: We are only 8 days from stable.
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

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

No need for a merge.  This code is not used in production.

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