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fix(detector): detect sys.exc_info exception frame access #75

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fix(detector): detect sys.exc_info exception frame access #75

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fix(detector): detect sys.exc_info frame access
SarahLacard May 1, 2026
875763f
chore: trigger blue-pr-sync re-evaluation
SarahLacard May 2, 2026
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19 changes: 19 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


RE_EXC_INFO = re.compile(r"sys\.exc_info\s*\(")
def detect_exc_info_frame(code: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code)
active = facts.custom_kernel_active or facts.python_active
if not RE_EXC_INFO.search(active): return []
if not re.search(r"except\b", active): return []
return [{"pattern": "FRAME_WALK_ACCESS", "severity": "medium", "evidence": "sys.exc_info() — exception-based frame access"}]


# ---------------------------------------------------------------------------
# Score anomaly detection
# ---------------------------------------------------------------------------
Expand Down Expand Up @@ -3653,6 +3662,14 @@ class RulePolicy:
"NEAR_CLONE_SPAM", "administrative", "support", SUSPICIOUS_ONLY, (),
(), "downgrade",
),
"GLOBAL_SENTINEL_REUSE": RulePolicy(
"GLOBAL_SENTINEL_REUSE", "result_reuse", "hard", AUTO_FILTER, (),
(), "rewrite",
),
"CLOSURE_STATE_REUSE": RulePolicy(
"CLOSURE_STATE_REUSE", "result_reuse", "hard", AUTO_FILTER, (),
(), "rewrite",
),
}

BASE_SCORE_CONFIG = {
Expand Down Expand Up @@ -3790,6 +3807,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
detect_thread_injection,
detect_lazy_tensor,
detect_precision_downgrade,
detect_exc_info_frame,
]

BASE_DETECTOR_SPECS = [
Expand Down Expand Up @@ -3827,6 +3845,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
("thread_injection", detect_thread_injection),
("lazy_tensor", detect_lazy_tensor),
("precision_downgrade", detect_precision_downgrade),
("exc_info_frame", detect_exc_info_frame),
]

VALID_RULE_OUTCOMES = {AUTO_FILTER, SUSPICIOUS_ONLY, TELEMETRY_ONLY}
Expand Down