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Issue metadata

Status: Verified
Owner:
Closed: Jan 2017
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 1
Type: Bug-Security



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Use-of-uninitialized-value in OT::RangeRecord::cmp

Project Member Reported by ClusterFuzz, Jan 6 2017

Issue description

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6600932143136768

Fuzzer: libfuzzer_harfbuzz_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  OT::RangeRecord::cmp
  int OT::SortedArrayOf<OT::RangeRecord, OT::IntType<unsigned short, 2u> >::bsearc
  OT::CoverageFormat2::get_coverage
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=423366:423427

Minimized Testcase (0.96 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96UjecNo2weX_Vxur5OreZP8k6w8XcbWRio075sSdVHQxM0vKtiAHgx-4taP34maNRR3kdpnLp6iK3QMDE61mo8ujuYESoeyo8kali4DlEOkfRrmU16VCWA9Mau2fuXtjNfVeAvLyOdfg1nP_78WRftaMm8tJnSS0ey8SPk1QxsjFaptYh-Iz2DBqnV-IjTQXEs7fIrHC8ymCbzgok0MzlmQWOAumKEv5dVPa8iJssw3CMgJ7KMAPR7dequfPOtkGJYLvDvyX-r5eACSo3gSnrrgydl0nyWhn2KvChXaRg3W8o26CL5JKA-N0RIfQhya8IfT0lvA1lzJvLBHZx0CFl74YNXrvWAagX-nK0-j9BBtsTqLZs?testcase_id=6600932143136768

Issue filed automatically.

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md for more information.
 
Components: Blink>Fonts
Owner: behdad@chromium.org
Status: Assigned (was: Untriaged)
behdad: I don't see anything in the regression range here, but could you take a look as a harfbuzz-ng OWNER?
Project Member

Comment 2 by sheriffbot@chromium.org, Jan 7 2017

Labels: M-57
Project Member

Comment 3 by sheriffbot@chromium.org, Jan 7 2017

Labels: ReleaseBlock-Beta
This issue is a security regression. If you are not able to fix this quickly, please revert the change that introduced it.

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

Comment 4 by sheriffbot@chromium.org, Jan 7 2017

Labels: Pri-1

Comment 5 by e...@chromium.org, Jan 17 2017

Cc: e...@chromium.org
Project Member

Comment 6 by ClusterFuzz, Jan 20 2017

ClusterFuzz has detected this issue as fixed in range 444694:444713.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6600932143136768

Fuzzer: libfuzzer_harfbuzz_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  OT::RangeRecord::cmp
  int OT::SortedArrayOf<OT::RangeRecord, OT::IntType<unsigned short, 2u> >::bsearc
  OT::CoverageFormat2::get_coverage
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=423366:423427
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=444694:444713

Minimized Testcase (0.96 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96UjecNo2weX_Vxur5OreZP8k6w8XcbWRio075sSdVHQxM0vKtiAHgx-4taP34maNRR3kdpnLp6iK3QMDE61mo8ujuYESoeyo8kali4DlEOkfRrmU16VCWA9Mau2fuXtjNfVeAvLyOdfg1nP_78WRftaMm8tJnSS0ey8SPk1QxsjFaptYh-Iz2DBqnV-IjTQXEs7fIrHC8ymCbzgok0MzlmQWOAumKEv5dVPa8iJssw3CMgJ7KMAPR7dequfPOtkGJYLvDvyX-r5eACSo3gSnrrgydl0nyWhn2KvChXaRg3W8o26CL5JKA-N0RIfQhya8IfT0lvA1lzJvLBHZx0CFl74YNXrvWAagX-nK0-j9BBtsTqLZs?testcase_id=6600932143136768

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.
Project Member

Comment 7 by ClusterFuzz, Jan 20 2017

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 6600932143136768 is verified as fixed, so closing issue.

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

Comment 8 by sheriffbot@chromium.org, Jan 20 2017

Labels: -Restrict-View-SecurityTeam Restrict-View-SecurityNotify
Labels: -ReleaseBlock-Beta
Project Member

Comment 10 by sheriffbot@chromium.org, Apr 28 2017

Labels: -Restrict-View-SecurityNotify allpublic
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

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