Python: Improve File Not Closed query to reduce false positives and provide clearer alerts#20392
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joefarebrother merged 6 commits intogithub:mainfrom Sep 18, 2025
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This reduces some confusing FPs, though appears to introduce another
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Pull Request Overview
This PR improves the Python "File Not Closed" query to reduce false positives and enhance alert clarity. The changes focus on better handling of with statements that guard exceptions and providing more informative error messages by linking to specific exception-raising locations.
- Refactored exception guarding logic to use local dataflow instead of basic block reachability
- Enhanced alert messages to include links to specific operations that may raise exceptions
- Added comprehensive test cases documenting previous false positive behaviors
Reviewed Changes
Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| python/ql/src/Resources/FileNotAlwaysClosed.ql | Updated query to support enhanced alert messages with exception location links |
| python/ql/src/Resources/FileNotAlwaysClosedQuery.qll | Improved exception guarding logic and dataflow analysis for better accuracy |
| python/ql/test/query-tests/Resources/FileNotAlwaysClosed/resources_test.py | Updated test annotations and added new test cases for previous false positives |
| python/ql/test/query-tests/Resources/FileNotAlwaysClosed/FileNotAlwaysClosed.qlref | Added query reference configuration |
| python/ql/test/query-tests/Resources/FileNotAlwaysClosed/FileNotAlwaysClosed.expected | Added expected test results |
python/ql/test/query-tests/Resources/FileNotAlwaysClosed/resources_test.py
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python/ql/test/query-tests/Resources/FileNotAlwaysClosed/resources_test.py
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withstatements guarding exceptions, that was resulting in some unintuitve false positives