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Issue metadata

Status: Duplicate
Merged: issue 802096
Owner:
Closed: Jan 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 3
Type: Bug



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Undefined-shift in ppparse

Project Member Reported by ClusterFuzz, Dec 22 2017

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=6335740366815232

Fuzzer: libFuzzer_swiftshader_vertex_routine_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Undefined-shift
Crash Address: 
Crash State:
  ppparse
  pp::ExpressionParser::parse
  pp::DirectiveParser::parseExpressionIf
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=521492:521536

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6335740366815232

Issue filed automatically.

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.
 
Project Member

Comment 1 by ClusterFuzz, Dec 22 2017

Components: Internals>GPU>SwiftShader
Labels: Test-Predator-Auto-Components
Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.
Cc: kkaluri@chromium.org
Labels: M-65
Owner: capn@chromium.org
Status: Assigned (was: Untriaged)
Since it is related to Swiftshader component, assigning it to capn@

capn@ could you please look into it


Thank You...

Comment 3 by capn@chromium.org, Jan 2 2018

Labels: -Pri-2 Pri-3
The undefined behavior is also undefined behavior in the shading language that this code compiles, so this is totally benign.
Project Member

Comment 4 by ClusterFuzz, Jan 13 2018

ClusterFuzz has detected this issue as fixed in range 529109:529114.

Detailed report: https://clusterfuzz.com/testcase?key=6335740366815232

Fuzzer: libFuzzer_swiftshader_vertex_routine_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Undefined-shift
Crash Address: 
Crash State:
  ppparse
  pp::ExpressionParser::parse
  pp::DirectiveParser::parseExpressionIf
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=521492:521536
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=529109:529114

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6335740366815232

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.
Project Member

Comment 5 by ClusterFuzz, Jan 13 2018

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 6335740366815232 is verified as fixed, so closing issue as verified.

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

Comment 6 by capn@chromium.org, Jan 16 2018

Mergedinto: 802096
Status: Duplicate (was: Verified)

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