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

yutak@ -- assigning you as the owner based on the topmost frame in the callstack. If you are not the right owner, please help find them. Thanks.

Hi yutak@ - have you had a chance to take a look?

[Bulk Edit]
URGENT - PTAL.
Your bug is labelled as M61 Stable ReleaseBlock, pls make sure to land the fix and get it merged into the release branch ASAP.

Know that this issue shouldn't block the release?  Remove the ReleaseBlock-Stable label.

Thank you.

Oh, I thought I disowned this but it seems like Monorail doesn't work correctly
if I leave restrict-view page.

So let me say this again: this is editing or layout issue. Wait for those teams
to triage. I don't know those areas.

Someone please remove me from CC list since I can't do that myself.

eae@ - could you help us find an owner for this?  Thanks!

eae: 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

r482483 https://chromium-review.googlesource.com/547541 is the only text related change in the regression range. Over to patch author.

That change has now been reverted (https://chromium-review.googlesource.com/#/c/611387/).

Is it correct to mark this as fixed now?

Please wait on ClusterFuzz to auto-verify and then it will close bug automatically.

ClusterFuzz has detected this issue as fixed in range 493793:493842.

Detailed report: https://clusterfuzz.com/testcase?key=4734899163758592

Fuzzer: ifratric-browserfuzzer-v3
Job Type: windows_asan_chrome
Platform Id: windows

Crash Type: Security DCHECK failure
Crash Address: 
Crash State:
  i < length_ in StringImpl.h
  blink::InlineTextBox::IsLineBreak
  blink::InlineTextBox::ContainsCaretOffset
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=windows_asan_chrome&range=482442:482493
Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome&range=493793:493842

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4734899163758592

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 4734899163758592 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 requires manual review: M61 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), ketakid@(ChromeOS), govind@(Desktop)

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

+awhalley@ for M61 merge review.

govind@ - good for 61

Approving merge to M61 branch 3163 based on comment #22. Please merge ASAP so we can take it in for this week Beta release. Thank you.

Merge commit was:
  https://chromium.googlesource.com/chromium/src.git/+/f83b3fa59417998a87c4ea62cda4b893de690532

Thanks!

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