Rust: Also lift read steps in summaries as taint steps#21122
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| bindingset[derefChain, borrow, strippedTypePath, strippedType] | ||
| private predicate hasNoCompatibleNonBlanketLikeTargetCheck( | ||
| string derefChain, BorrowKind borrow, TypePath strippedTypePath, Type strippedType | ||
| DerefChain derefChain, BorrowKind borrow, TypePath strippedTypePath, Type strippedType |
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Pull request overview
This PR generalizes taint propagation through read steps in Rust data flow analysis. Previously, only element and reference content would propagate taint through all read steps (including flow summaries). Now, all content types participate in taint propagation through read steps, unless explicitly excluded.
Key changes:
- Simplified taint tracking logic to treat all read steps uniformly
- Enables flow summaries to properly participate in taint propagation for all content types
- Fixes previously missing taint flows through operations like
.clone().into_string().unwrap()and.lines().nth(1).unwrap().clone()
Reviewed changes
Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| rust/ql/lib/codeql/rust/dataflow/internal/TaintTrackingImpl.qll | Simplified taint step logic to apply to all read steps rather than just element/reference content |
| rust/ql/test/query-tests/security/CWE-798/HardcodedCryptographicValue.expected | Updated test expectations with new flow summaries (MaD 18-22) for Vec::from conversions |
| rust/ql/test/query-tests/security/CWE-022/TaintedPath.expected | Added new taint edges for PathBuf conversions through field reads |
| rust/ql/test/library-tests/dataflow/strings/inline-taint-flow.expected | Updated with new String::from flow summaries and renumbered existing models |
| rust/ql/test/library-tests/dataflow/sources/stdin/test.rs | Removed MISSING marker - taint flow now properly detected through .clone() |
| rust/ql/test/library-tests/dataflow/sources/stdin/InlineFlow.expected | Added new edges for clone and nth operations, new models for these operations |
| rust/ql/test/library-tests/dataflow/sources/file/test.rs | Removed MISSING marker - taint flow now detected through .into_string().unwrap() |
| rust/ql/test/library-tests/dataflow/sources/file/InlineFlow.expected | Added new OsString::into_string flow summary |
| rust/ql/test/library-tests/dataflow/modeled/inline-flow.expected | Added new Pin::new flow summary and updated model numbering |
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Does what the title says.
DCA looks good: A good number of new alerts, and no performance regressions.