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fix(StdCheats): exclude P256VERIFY precompile in assumeNotPrecompile - #927
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mattsse merged 3 commits intoOct 23, 2026
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assumeNotPrecompile only excluded 0x01-0xff, so fuzzers could pick 0x100, the P256VERIFY precompile added in Osaka (EIP-7951).
maurelian
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0xrusowsky,
DaniPopes,
grandizzy,
mattsse and
onbjerg
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October 7, 2026 22:49
maurelian
commented
Oct 7, 2026
| assumeNotPrecompile(addr, getChain("optimism_sepolia").chainId); | ||
| assertTrue( | ||
| addr < address(1) || (addr > address(9) && addr < address(0x4200000000000000000000000000000000000000)) | ||
| addr < address(1) || (addr > address(0x100) && addr < address(0x4200000000000000000000000000000000000000)) |
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This expands the range a lot, but I think it's still reasonable to consider it "within the range of things that might become precompiles". Can change to just add 0x100 instead of expanding, if preferred.
DaniPopes
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Oct 12, 2026
mattsse
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Oct 23, 2026
mattsse
enabled auto-merge (squash)
October 23, 2026 07:00
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assumeNotPrecompileexcludes0x01–0xff, so fuzzers can still pick0x100, the P256VERIFY precompile added in Osaka (EIP-7951). Tests that thenvm.etchthat address fail with "cannot use precompile 0x…0100". We found this running tests on the Amsterdam hardfork.This widens the excluded range to
0x100, updates thetestFuzz_AssumeNotPrecompileassertion, and addstest_AssumeNotPrecompileP256Verify, which uses the existingStdCheatsMockpattern. Both tests fail without the fix.