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blue: catches KG#44 — lambda + operator.setitem + data_ptr dispatch #143

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blue: catches KG#44 — lambda + operator.setitem + data_ptr dispatch #143

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17 changes: 17 additions & 0 deletions kernelguard.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1470,6 +1470,18 @@ def detect_runtime_package_install(code: str | SubmissionFacts) -> list[dict]:
return []


def detect_lambda_operator_dispatch(code_or_facts: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code_or_facts)
if not facts.python_active:
return []
has_lambda = bool(re.search(r'custom_kernel\s*=\s*lambda', facts.raw_code))
has_operator_setitem = bool(re.search(r'operator\.setitem', facts.raw_code))
has_dataptr = bool(re.search(r'data_ptr\s*\(', facts.raw_code))
if has_lambda and has_operator_setitem and has_dataptr:
return [{"pattern": "LAMBDA_OPERATOR_DISPATCH", "severity": "high", "evidence": "Lambda entrypoint with operator.setitem and data_ptr keyed dispatch"}]
return []


# ---------------------------------------------------------------------------
# AST-based detectors (Layer 2: structural analysis beyond regex)
# ---------------------------------------------------------------------------
Expand Down Expand Up @@ -3653,6 +3665,9 @@ class RulePolicy:
"NEAR_CLONE_SPAM", "administrative", "support", SUSPICIOUS_ONLY, (),
(), "downgrade",
),
"LAMBDA_OPERATOR_DISPATCH": RulePolicy(
"LAMBDA_OPERATOR_DISPATCH", "result_reuse", "hard", AUTO_FILTER, (), (), "keep",
),
}

BASE_SCORE_CONFIG = {
Expand Down Expand Up @@ -3775,6 +3790,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
detect_token_paste_cuda_api,
detect_sequence_batch_graph,
detect_runtime_package_install,
detect_lambda_operator_dispatch,
# AST-based detectors (Layer 2)
detect_trusted_module_import,
detect_module_mutation,
Expand Down Expand Up @@ -3813,6 +3829,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
("token_paste_cuda_api", detect_token_paste_cuda_api),
("sequence_batch_graph", detect_sequence_batch_graph),
("runtime_package_install", detect_runtime_package_install),
("lambda_operator_dispatch", detect_lambda_operator_dispatch),
("trusted_module_import", detect_trusted_module_import),
("module_mutation", detect_module_mutation),
("globals_mutation", detect_globals_mutation),
Expand Down