More symbolic overapproximation when the remote contract cannot be fetched, adding CodeHash SMT representation #673
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Fixing changelog Better debug Fixing build Fixing build Fixing
msooseth
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blishko
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Mar 6, 2025
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Description
This allows us to overapproximate when the contract is real, but cannot be fetched. Meant to be on top of #658 i.e.
symbolic-extcodesize. It allows us to overapproximate also when the contract cannot be fetched with RPC for opcodes:I also added
CodeHashSMT representation so concrete addresses that cannot be fetched can be abstracted away and e.g. equivalence-checked. Tests have been added that exercise this very functionality.See opcodes for reference:
Debug code has also been added to show when the system is trying to fetch data via RPC. This helps in e.g. debugging. We probably at one point want to collect this data, which would allow us to fully and correctly replay things in tests. But that's a bit far away...
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