The StorageLayoutV1.sol contract is inherited by several contracts and represents a shared common state that ensures the slot layout of certain contracts are the same. It is possible to minimise the number of storage slots used by rearranging the state variables in the most efficient way.
Handle
leastwood
Vulnerability details
Impact
The
StorageLayoutV1.solcontract is inherited by several contracts and represents a shared common state that ensures the slot layout of certain contracts are the same. It is possible to minimise the number of storage slots used by rearranging the state variables in the most efficient way.Proof of Concept
https://github.com/code-423n4/2021-08-notional/blob/main/contracts/global/StorageLayoutV1.sol
Tools Used
Manual code review
Recommended Mitigation Steps
Arrange the
uint16andbytes1variables such that they fit into the same slot.