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fix(detector): detect io.StringIO/BytesIO output injection #67

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fix(detector): detect io.StringIO/BytesIO output injection #67

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130d728
fix(detector): detect io stream output manipulation
SarahLacard May 1, 2026
c70648f
chore: trigger blue-pr-sync re-evaluation
SarahLacard May 2, 2026
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9 changes: 9 additions & 0 deletions kernelguard.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3026,6 +3026,13 @@ def detect_precision_downgrade(code: str | SubmissionFacts) -> list[dict]:


# ---------------------------------------------------------------------------
RE_IO_STREAM = re.compile(r'io\.(?:StringIO|BytesIO)\s*\(')
def detect_io_stream_output(code: str | SubmissionFacts) -> list[dict]:
facts = ensure_submission_facts(code)
if not RE_IO_STREAM.search(facts.raw_code): return []
return [{"pattern": "STDIO_REDIRECT", "severity": "medium", "evidence": "io.StringIO/BytesIO — in-memory stream for output injection/manipulation"}]


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

Expand Down Expand Up @@ -3790,6 +3797,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
detect_thread_injection,
detect_lazy_tensor,
detect_precision_downgrade,
detect_logging_output_injection,
]

BASE_DETECTOR_SPECS = [
Expand Down Expand Up @@ -3827,6 +3835,7 @@ def support_only_patterns(matched_patterns: list[dict]) -> bool:
("thread_injection", detect_thread_injection),
("lazy_tensor", detect_lazy_tensor),
("precision_downgrade", detect_precision_downgrade),
("io_stream_output", detect_io_stream_output),
]

VALID_RULE_OUTCOMES = {AUTO_FILTER, SUSPICIOUS_ONLY, TELEMETRY_ONLY}
Expand Down