tlv-account-resolution: Always demote signer flag #164
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#### Problem As described at solana-program/transfer-hook#83, there's just too many ways for signers to be potentially abused during transfer hooks. #### Summary of changes Demote all accounts to non-signer when resolving from an extra account metas list.
buffalojoec
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buffalojoec
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Lgtm. This is definitely the safer route to take.
tlv-account-resolution/src/state.rs
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| account_info_to_meta(&account_infos[0]), | ||
| account_info_to_meta(&account_infos[1]), | ||
| account_info_to_meta(&account_infos[2]), | ||
| de_escalate_signer(account_info_to_meta(&account_infos[0])), |
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Can't you just use account_info_to_meta_non_signer for all of these?
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Ah yes, nice catch!
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Well it's only possible on these three, the rest are account metas already, not account infos
tlv-account-resolution/src/state.rs
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| // This is a little tricky to read, but the idea is to see if this account | ||
| // is marked as writable anywhere in the instruction at the start. If so, | ||
| // DON'T escalate it to be a writer in the CPI |
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Is this comment incorrect? Shouldn't it say:
Check to see if the account is writable in the original instruction...
- "If it's not, don't escalate it"
- or: "If it's not, deescalate the extra meta
is_writableconfig"
But just worded better than what I wrote.
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Yeah that makes more sense, thanks!
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Just checking - when the program is upgraded to deescalate any signers in the Any particular plan to this upgrade and breaking behavioral change? |
From what I understand, there aren't really any uses of signers in transfer hooks, but we'll need to work with Foundation eng to get the word out -- @tiago18c can you help with that? |
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I did some digging:
Basically there will be no one affected (other than possible black hats). |
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Problem
As described at solana-program/transfer-hook#83, there's just too many ways for signers to be potentially abused during transfer hooks.
Summary of changes
Demote all accounts to non-signer when resolving from an extra account metas list.