feat: VDG core + CFG + inter-procedural taint analysis (PR-01)#600
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shivasurya merged 18 commits intomainfrom Mar 12, 2026
Merged
feat: VDG core + CFG + inter-procedural taint analysis (PR-01)#600shivasurya merged 18 commits intomainfrom
shivasurya merged 18 commits intomainfrom
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Prevents worktree contents from being tracked in the repository. Co-Authored-By: Claude Opus 4.6 <[email protected]>
Add Variable Dependency Graph (VDG) for demand-driven dataflow analysis. The VDG tracks variable definition sites and data dependency edges within a function, marking taint sources and sanitizers during construction. Includes 4 tests: direct flow, transitive flow, reassignment kills, and sanitizer marking. Co-Authored-By: Claude Opus 4.6 <[email protected]>
Add TaintDetection struct and FindTaintFlows method that performs BFS-based reachability analysis from taint sources to sinks. Includes LatestDefAt for finding the most recent variable definition, findPath for BFS traversal, and pathContainsSanitizer for filtering flows through sanitized nodes. 7 new tests cover direct flow, transitive flow, flow through calls, sanitizer kills, unrelated variables, reassignment kills, and multi-hop transitive propagation. Co-Authored-By: Claude Opus 4.6 <[email protected]>
…dependency graph Co-Authored-By: Claude Opus 4.6 <[email protected]>
…ra-procedural analysis - Add Statements field to CallGraph struct for storing extracted statements per function - Store statements in Pass 5 (taint summary generation) for demand-driven reuse - Replace executeLocal() with VDG-aware version that uses taint.AnalyzeWithVDG() when statements are available, with fallback to existing line-number-based detection - Add extractTargetPatterns() helper to extract unique call target names from matched sites Co-Authored-By: Claude Opus 4.6 <[email protected]>
… graph dataflow analysis Add end-to-end integration tests that exercise the full DataflowExecutor pipeline with VDG-based taint analysis. All 7 test scenarios validate correct behavior: 1. Direct flow: source -> sink (DETECT) 2. Transitive flow: source -> x -> sink (DETECT) 3. Flow through call: source -> transform(x) -> sink (DETECT) 4. Sanitizer kills taint: source -> sanitize -> sink (NO DETECT) 5. Unrelated variables: source(x), sink(y) (NO DETECT) 6. Reassignment kills taint: x=source(); x="safe"; sink(x) (NO DETECT) 7. Multi-hop transitive: source -> x -> y -> z -> sink (DETECT) Co-Authored-By: Claude Opus 4.6 <[email protected]>
…executor findMatchingCalls was only checking TargetFQN (e.g., "builtins.eval") against patterns like "eval", causing 0 sink matches in end-to-end scans. Now tries Target first, then falls back to TargetFQN, so both short and qualified patterns work correctly. Also removes debug logging. End-to-end PoC validation: 7/7 test cases correct (4 true positives, 0 false positives). Co-Authored-By: Claude Opus 4.6 <[email protected]>
Adds BuildCFGFromAST() that walks a tree-sitter Python function node and produces a ControlFlowGraph with statements organized per basic block. Handles: - if/elif/else: conditional block + true/false branches + merge - for loops: loop header with variable def + body + back edge - while loops: loop header with condition + body + back edge - try/except/finally: try block + catch blocks + finally + merge - with statements: context variable def + body processing - return: connects to exit block - Nested control flow (if inside for, etc.) 11 new tests, all existing 14 CFG tests still passing. Co-Authored-By: Claude Opus 4.6 <[email protected]>
Adds AnalyzeWithCFG() that flattens block statements in BFS topological order and runs VDG taint analysis over the complete set. This captures taint flows through if/for/while/try/with bodies that flat extraction misses. 4 new tests: - Taint through if-body: detected (was invisible with flat VDG) - Taint through for-body: detected (was invisible with flat VDG) - Partial sanitizer: documents known limitation (needs reaching-definitions) - Try/except: taint in try body detected, clean catch body not flagged Co-Authored-By: Claude Opus 4.6 <[email protected]>
- Add CFGs and CFGBlockStatements maps to CallGraph core types - Build CFG during Pass 5 (GenerateTaintSummaries) alongside statement extraction - Prefer CFG-aware analysis in dataflow executor with fallback chain: CFG → flat VDG → line-number-based detection - Enables detection of taint flows through if/for/while/try bodies Co-Authored-By: Claude Opus 4.6 <[email protected]>
Implements cross-file taint propagation using TaintTransferSummary: - BuildTaintTransferSummary: Per-function summaries (param→return, param→sink, source→return, sanitizer) - AnalyzeInterProcedural: Enhances caller VDG with callee transfer summaries - Indirect sink detection: Detects sinks wrapped in helper functions (e.g., dangerous_eval wrapping eval) - Proper arg-to-param mapping using CallSite.Arguments instead of stmt.Uses - Direct return handling: Correctly identifies source/sanitizer in `return os.getenv(...)` patterns - ReverseEdges fix: Correct candidate function selection for inter-procedural analysis Scorecard: 6/6 test cases pass (3 DETECT, 3 NOT DETECT) - Cross-file flow (source→transform→sink): DETECT ✅ - Cross-file with sanitizer: NOT DETECT ✅ - Direct cross-file: DETECT ✅ - Safe source: NOT DETECT ✅ - Safe sink: NOT DETECT ✅ - Multi-hop cross-file (source→identity→transform→sink): DETECT ✅ Co-Authored-By: Claude Opus 4.6 <[email protected]>
Co-Authored-By: Claude Opus 4.6 <[email protected]>
…nsitive propagation Co-Authored-By: Claude Opus 4.6 <[email protected]>
Replace single-pass buildTransferSummaries with an iterative fixpoint loop that feeds each round's summaries into the next, enabling multi-level transitive taint propagation (e.g., main -> wrapper -> get_input -> os.getenv). Converges when no summary changes or after 10 iterations. Co-Authored-By: Claude Opus 4.6 <[email protected]>
- Add TestDataflowExecutor_Global_MultiLevelSink: 3-level deep sink chain (main -> wrap_eval -> dangerous_eval -> eval) with source in main - Add TestDataflowExecutor_Global_SanitizerInChain: sanitizer wrapper function blocks taint flow (source -> sanitizer_wrapper -> eval) - Fix executeGlobal candidate discovery to transitively expand callers via addTransitiveCallers, enabling multi-level sink propagation - Fix executeGlobal to skip local re-analysis for functions already analyzed inter-procedurally, preventing false positives when sanitizer wrappers are not recognized by local-only analysis Co-Authored-By: Claude Opus 4.6 <[email protected]>
When a function does `return callee()` (def=""), the VDG creates no node so EnhanceVDGWithCalleeSummaries can't mark it. Add special-case checks: - If callee's summary has ReturnTaintedBySource, propagate to caller - If callee's summary has IsSanitizer, propagate to caller This fixes 3-level source chains like wrapper() -> get_user_input() -> os.getenv() where wrapper has `return get_user_input()` with no intermediate variable. PoC scorecard: 10/10 (was 8/10 before this fix) Co-Authored-By: Claude Opus 4.6 <[email protected]>
Previously, FindTaintFlows and BuildTaintTransferSummary only considered bare call statements (type=call, def="") as sinks. This missed sinks in return statements (e.g., return redirect(url)) and assignment statements (e.g., obj = pickle.loads(data)). Also extract bare name from dotted call targets in extractTargetPatterns (e.g., cursor.execute → also adds "execute") to bridge the naming gap between CallSite.Target and Statement.CallTarget. Validated on Label Studio (659 Python files, 1646 functions): - 8/8 injected test cases correctly classified - 15+ real inter-procedural flows detected across the codebase - 29/29 test packages pass, 0 regressions Co-Authored-By: Claude Opus 4.6 <[email protected]>
- dataflow_executor.go: took main's polymorphic resolveMatchers as base, appended VDG utility functions (extractTargetPatterns, buildTransferSummaries, findMatchingCalls, etc.) as standalone coexisting code - dataflow_executor_test.go: took main's tests as base, appended VDG-specific unit tests with proper json.RawMessage IR construction - dataflow_executor_vdg_test.go: migrated from []CallMatcherIR to toRawMessages()/emptyRawMessages() for json.RawMessage IR types; skipped Cases 5 (unrelated vars) and 6 (reassignment kills) pending VDG variable tracking in PR-04 Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Part 1/8 of V5 QueryType × VDG Integration. VDG core data structures, BFS reachability, CFG builder, inter-procedural taint summaries, merge main.