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fix(StdCheats): exclude P256VERIFY precompile in assumeNotPrecompile #927

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fix(StdCheats): exclude P256VERIFY precompile in assumeNotPrecompile #927

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3 changes: 2 additions & 1 deletion src/StdCheats.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -327,7 +327,8 @@ abstract contract StdCheatsSafe {
// address), but the same rationale for excluding them applies so we include those too.

// These are reserved by Ethereum and may be on all EVM-compatible chains.
vm.assume(addr < address(0x1) || addr > address(0xff));
// 0x100 is P256VERIFY (EIP-7951).
vm.assume(addr < address(0x1) || addr > address(0x100));

// forgefmt: disable-start
if (chainId == 10 || chainId == 420 || chainId == 11155420) {
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14 changes: 13 additions & 1 deletion test/StdCheats.t.sol
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Expand Up @@ -401,11 +401,19 @@ contract StdCheatsTest is Test {
function testFuzz_AssumeNotPrecompile(address addr) external {
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))

@maurelian maurelian Oct 7, 2026

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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.

|| addr > address(0x4200000000000000000000000000000000000800)
);
}

function test_AssumeNotPrecompileP256Verify() external {
StdCheatsMock stdCheatsMock = new StdCheatsMock();

// P256VERIFY (EIP-7951)
vm.expectRevert();
stdCheatsMock.exposedAssumeNotPrecompile(address(0x100));
}

function testFuzz_AssumeNotForgeAddress(address addr) external pure {
assumeNotForgeAddress(addr);
assertTrue(
Expand Down Expand Up @@ -508,6 +516,10 @@ contract StdCheatsMock is StdCheats {
function exposedAssumeNotBlacklisted(address token, address addr) external view {
return assumeNotBlacklisted(token, addr);
}

function exposedAssumeNotPrecompile(address addr) external pure {
assumeNotPrecompile(addr);
}
}

contract StdCheatsForkTest is Test {
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