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blue: catches KG#259 — copyreg dispatch #239

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blue: catches KG#259 — copyreg dispatch #239

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16 changes: 16 additions & 0 deletions kernelguard.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3025,6 +3025,15 @@ def detect_precision_downgrade(code: str | SubmissionFacts) -> list[dict]:
return matches


def detect_copyreg_pickle(code: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code)
code = facts.raw_code
if re.search(r'copyreg\.pickle\s*\(', code) and re.search(r'__reduce_ex__\s*\b', code):
if re.search(r'\bid\s*\(', code):
return [{"pattern": "COPYREG_PICKLE", "severity": "critical", "evidence": "copyreg.pickle with __reduce_ex__ and id-keyed cache (copyreg dispatch caching bypass)"}]
return []


# ---------------------------------------------------------------------------
# Score anomaly detection
# ---------------------------------------------------------------------------
Expand Down Expand Up @@ -3653,6 +3662,10 @@ class RulePolicy:
"NEAR_CLONE_SPAM", "administrative", "support", SUSPICIOUS_ONLY, (),
(), "downgrade",
),
"COPYREG_PICKLE": RulePolicy(
"COPYREG_PICKLE", "result_reuse", "hard", AUTO_FILTER, (),
(), "keep",
),
}

BASE_SCORE_CONFIG = {
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_copyreg_pickle,
]

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),
("copyreg_pickle", detect_copyreg_pickle),
]

VALID_RULE_OUTCOMES = {AUTO_FILTER, SUSPICIOUS_ONLY, TELEMETRY_ONLY}
Expand Down Expand Up @@ -4705,6 +4720,7 @@ def _worker_parquet(args: tuple) -> dict:
"TOKEN_PASTE_CUDA_API", "SEQUENCE_BATCH_GRAPH", "PARTIAL_GRAPH_KEY", "RUNTIME_PACKAGE_INSTALL",
"PRECISION_DOWNGRADE", "SCORE_PHYSICS_FLOOR", "SCORE_IMPOSSIBLE", "SCORE_SUSPECT_FLOOR",
"SCORE_BROKEN", "SCORE_EXTREME_SPEEDUP", "DUPLICATE_SPAM", "NEAR_CLONE_SPAM",
"COPYREG_PICKLE",
]


Expand Down