Cross-function taint (phases 1+2): bidirectional single-file propagation (0.21.0) - #25
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Completes bidirectional single-file cross-function taint for AG040. Phase 1 followed a
helper's RETURN into its caller; phase 2 follows a caller's argument INTO a helper's
parameter and to a sink inside it:
def run_it(code): exec(code) # bare param — silent on its own
def tool(p): run_it(llm.invoke(p)) # now flagged: a caller feeds model output
New _param_index + _param_fed_by_model: resolve the sink's enclosing function, find the
parameter's position, and check same-file callers (positional, keyword, and non-first
position) for model output. Bounded depth; keyword-only params conservatively skipped.
Verification:
- Ground-truth corpus: 160 cases, precision 1.000 / recall 1.000 (adds return + parameter
positives and non-model / no-caller negatives).
- Real-repo benchmark: AG040 = 0 across 41 repos — zero false positives, total findings flat.
- 635 tests, 100% branch coverage, ruff + ruff format + mypy all clean.
Stacked on phase 1; carries both phases. Bumps 0.20.0 -> 0.21.0. README limits note updated.
Signed-off-by: AutonomyProof <info@autonomyproof.io>
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Introduces a same-file call graph (function_defs/return_values) and makes AG040 follow model output across the function boundary in both directions: a helper's return (phase 1) and into a helper's parameter (phase 2).
Verified: corpus 160 cases 1.000/1.000; AG040=0 across 41 repos; 635 tests, 100% coverage. Bumps 0.19.0 -> 0.21.0.