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fix(detector): detect contextvars implicit state #65

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SarahLacard wants to merge 2 commits into from
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fix(detector): detect contextvars implicit state #65

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9e9f918
fix(detector): detect contextvars implicit state
SarahLacard May 1, 2026
9a7dd21
chore: trigger blue-pr-sync re-evaluation
SarahLacard May 2, 2026
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15 changes: 15 additions & 0 deletions kernelguard.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3024,10 +3024,23 @@ def detect_precision_downgrade(code: str | SubmissionFacts) -> list[dict]:

return matches

RE_WEAKREF = re.compile(r'weakref\.(?:ref|WeakValueDictionary|WeakKeyDictionary|WeakSet|finalize)\s*\(')
def detect_weakref_state(code: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code)
if not RE_WEAKREF.search(facts.raw_code): return []
return [{"pattern": "WORKSPACE_CACHE", "severity": "low", "evidence": "weakref.ref/WeakValueDictionary/WeakKeyDictionary — garbage-collectible state container evades replay detection"}]

RE_DIS = re.compile(r'dis\.(?:dis|get_instructions|Bytecode|code_info)\s*\(')
def detect_dis_bytecode(code: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code)
if not RE_DIS.search(facts.raw_code): return []
return [{"pattern": "CODE_ACCESS", "severity": "high", "evidence": "dis.dis/Bytecode/get_instructions — bytecode inspection for code manipulation"}]

# ---------------------------------------------------------------------------
# Score anomaly detection
# ---------------------------------------------------------------------------
# Score anomaly detection
# ---------------------------------------------------------------------------

def _collect_scores(metadata: Optional[dict]) -> tuple[list[float], Optional[float], Optional[float]]:
"""Extract all available scores from metadata into a unified list."""
Expand Down Expand Up @@ -3790,6 +3803,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
detect_thread_injection,
detect_lazy_tensor,
detect_precision_downgrade,
detect_contextvars_state,
]

BASE_DETECTOR_SPECS = [
Expand Down Expand Up @@ -3827,6 +3841,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
("thread_injection", detect_thread_injection),
("lazy_tensor", detect_lazy_tensor),
("precision_downgrade", detect_precision_downgrade),
("contextvars_state", detect_contextvars_state),
]

VALID_RULE_OUTCOMES = {AUTO_FILTER, SUSPICIOUS_ONLY, TELEMETRY_ONLY}
Expand Down