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fix(detector): direction coverage — TIMER_MONKEYPATCH extension to time.* attrs #25

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fix(detector): direction coverage — TIMER_MONKEYPATCH extension to time.* attrs #25

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20 changes: 20 additions & 0 deletions kernelguard.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,12 @@
# Pattern 1: Timer monkey-patching
RE_CUDA_EVENT_ASSIGN = re.compile(r'torch\.cuda\.Event\s*=\s*')
RE_CUDA_EVENT_SETATTR = re.compile(r'setattr\s*\(\s*torch\.cuda\s*,\s*[\'"]Event[\'"]\s*,')
RE_TIME_MODULE_ATTR_ASSIGN = re.compile(
r'\btime\.(perf_counter|perf_counter_ns|monotonic|monotonic_ns|process_time|time)\s*=\s*'
)
RE_TIME_MODULE_SETATTR = re.compile(
r'setattr\s*\(\s*time\s*,\s*[\'"](perf_counter|perf_counter_ns|monotonic|monotonic_ns|process_time|time)[\'"]\s*,'
)
RE_ELAPSED_TIME_METHOD_PATCH = re.compile(r'torch\.cuda\.Event\.elapsed_time\s*=')
RE_CUDA_SYNCHRONIZE_PATCH = re.compile(r'torch\.cuda\.synchronize\s*=')
RE_DUMMY_FAKE_EVENT = re.compile(r'class\s+_?(?:Dummy|Fake|Mock|Stub|Noop)\w*Event', re.IGNORECASE)
Expand Down Expand Up @@ -586,6 +592,20 @@ def detect_timer_monkeypatch(code: str | SubmissionFacts) -> list[dict]:
"severity": "critical",
"evidence": "torch.cuda.synchronize patched",
})
if RE_TIME_MODULE_ATTR_ASSIGN.search(code):
m = RE_TIME_MODULE_ATTR_ASSIGN.search(code)
matches.append({
"pattern": "TIMER_MONKEYPATCH",
"severity": "critical",
"evidence": f"time.{m.group(1)} reassigned (host-clock monkeypatch)",
})
if RE_TIME_MODULE_SETATTR.search(code):
m = RE_TIME_MODULE_SETATTR.search(code)
matches.append({
"pattern": "TIMER_MONKEYPATCH",
"severity": "critical",
"evidence": f"setattr(time, '{m.group(1)}', ...) patching",
})
if RE_DUMMY_FAKE_EVENT.search(code):
matches.append({
"pattern": "TIMER_MONKEYPATCH",
Expand Down