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Limit EXTCODECOPY to eof bytes

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When copying EOF contracts, make sure EXTCODECOPY only has access to the EOF magic, not just two bytes total.
This commit is contained in:
Danno Ferrin 2024-10-25 12:27:23 -06:00
parent 56ff85a808
commit 1156ca42f2
1 changed files with 4 additions and 2 deletions
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6
core/vm/instructions.go
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@ -395,6 +395,7 @@ func opExtCodeCopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext)
codeOffset = stack.pop()
length = stack.pop()
lengthU64 = length.Uint64()
codeCopy []byte
)
uint64CodeOffset, overflow := codeOffset.Uint64WithOverflow()
if overflow {
@ -406,9 +407,10 @@ func opExtCodeCopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext)
witness.AddCode(code)
}
if isEOFVersion1(code) {
lengthU64 = 2
codeCopy = getData(eofMagic, uint64CodeOffset, lengthU64)
} else {
codeCopy = getData(code, uint64CodeOffset, lengthU64)
}
codeCopy := getData(code, uint64CodeOffset, lengthU64)
scope.Memory.Set(memOffset.Uint64(), lengthU64, codeCopy)
return nil, nil