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blue: catches KG#252 — __set_name__ descriptor caching bypass #232

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blue: catches KG#252 — __set_name__ descriptor caching bypass #232

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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 @@ -3025,6 +3025,15 @@ def detect_precision_downgrade(code: str | SubmissionFacts) -> list[dict]:
return matches


def detect_set_name_cache(code: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code)
code = facts.raw_code
if re.search(r'def\s+__set_name__\s*\(', code) and re.search(r'def\s+__get__\s*\(', code):
if re.search(r'__set_name__.*?\w+\s*=\s*\{\}', code, re.DOTALL):
return [{"pattern": "SET_NAME_CACHE", "severity": "critical", "evidence": "__set_name__ descriptor with __get__ dict cache (metadata-tag caching bypass)"}]
return []


# ---------------------------------------------------------------------------
# Score anomaly detection
# ---------------------------------------------------------------------------
Expand Down Expand Up @@ -3653,6 +3662,10 @@ class RulePolicy:
"NEAR_CLONE_SPAM", "administrative", "support", SUSPICIOUS_ONLY, (),
(), "downgrade",
),
"SET_NAME_CACHE": RulePolicy(
"SET_NAME_CACHE", "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_set_name_cache,
]

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),
("set_name_cache", detect_set_name_cache),
]

VALID_RULE_OUTCOMES = {AUTO_FILTER, SUSPICIOUS_ONLY, TELEMETRY_ONLY}
Expand Down