fix(detector): direction coverage — JOIN/CONCAT-built dynamic dispatch detector#23
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fix(detector): direction coverage — JOIN/CONCAT-built dynamic dispatch detector#23SinatrasC wants to merge 1 commit into
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Targets red #125 ('Token-paste / filter evasion'). Live KG (0.2.2) calls this valid: def custom_kernel(data): name = ''.join(['e', 'x', 'e', 'c']) f = __builtins__[name] if isinstance(__builtins__, dict) else getattr(__builtins__, name) f('pass') return data.clone() The literal 'exec' never appears in source, so the existing detect_dynamic_execution Call-walking pass finds nothing. Approach: add two detection branches in the same family as the chr-concat rule (PR #15). Both flag piecewise string construction with >=3 short- literal pieces, regardless of whether the result feeds into a dynamic- dispatch site or not - that level of fragmentation has no legitimate use in numerical kernels. * '".join([Constant, Constant, ...])' with all short-literal elts and len >= 3 * 'BinOp(Add, ...)' chain whose leaves are all short-literal Constants and chain length >= 4 Verified locally: red #125 flagged, all 5 legit corpus cases stay valid, classic LAST_CALL_REPLAY still flagged. The 5 other directions' reds are untouched (they need their own per-direction patches).
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Thanks for the KernelGuard Flywheel Campaign contribution. We are not selecting this PR for merge because it is too narrow or not aligned with the current consolidated rule-family surface. |
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Summary
Targets KG red #125 under "Direction — Token-paste / filter evasion in C++". Coverage example for the previously-empty direction; the red was submitted via the direct API path and is currently
red_accepted: 1on the live leaderboard.Targets red #125 (filter-evasion via piecewise string construction).
This blue: JOIN/CONCAT-built dynamic dispatch detector.
Local verification
Patch was verified locally against a corpus that exercises:
plain_kernel,workspace_lazy,shape_dispatch,config_lookup,triton_jit_kernel) — all stay validKernelGuard-Red-Submission: 125