miniscript: the 'd:' wrapper must not be 'u' #24906
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The value it leaves on the stack depends on the last element on the stack. However, we can't make sure this element is OP_1 (which would give us the 'u' property) without the MINIMALIF rule. MINIMALIF is only policy for P2WSH, therefore giving 'd:' the 'u' property breaks consensus soundness: it makes it possible (by consensus but not policy) for instance to satisfy a thresh() without satisfying at least k of its subs. This bug was found and reported by Andrew Poelstra.
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ACK 7417594 |
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utACK 7417594 |
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ACK 7417594 |
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ACK 7417594 |
sidhujag
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Apr 19, 2022
7417594 miniscript: the 'd:' wrapper must not be 'u' (Antoine Poinsot) Pull request description: The type system was incorrectly relying on a standardness rule to be sound. This bug was found and reported by Andrew Poelstra [based on a question from Aman Kumar Kashyap](rust-bitcoin/rust-miniscript#341). ACKs for top commit: sipa: ACK 7417594 apoelstra: utACK 7417594 achow101: ACK 7417594 Tree-SHA512: af68c1df1c40e40dd105ef54544c226f560524dd8e35248fa0305dbef966e96ec1fa6ff2fe50fb8f2792ac310761a29c55ea81dd7b6d122a0de0a68b135e5aaa
This was referenced Mar 9, 2023
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The type system was incorrectly relying on a standardness rule to be sound.
This bug was found and reported by Andrew Poelstra based on a question from Aman Kumar Kashyap.