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txType == TransactionType.ExecuteSlowMode may cause batch of transactions to fail due to _slowModeConfig.txUpTo < _slowModeConfig.txCount

Low/InfoVertex·by the Three Sigma team·Hybrid orderbook DEX·3rd April 20243S-Vertex-L10

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Description

txType == TransactionType.ExecuteSlowMode allows the sequencer to execute slow mode transactions. However, these transactions can also be executed permissionlessly.

Endpoint::_executeSlowModeTransaction reverts if _slowModeConfig.txUpTo < _slowModeConfig.txCount, which means that if before executing Endpoint::submitTransactionsChecked(), someone executes the slow mode transactions up to the latest, the whole batch will revert.

Recommendation

This is unlikely to happen as there is a significant delay in slow mode transactions, which is ignored by the sequencer. Nontheless, an early return can be performed instead of reverting in Endpoint::_executeSlowModeTransaction.

Status

Acknowledged

Found during Three Sigma’s team review · 0xSimao on the review team