fix(Governor): remove CappedMath and tx order #1618
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WalkthroughThe changes in the Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant KlerosGovernor
participant Blockchain
User->>KlerosGovernor: Submit Transaction
KlerosGovernor->>KlerosGovernor: Validate Submission Period
KlerosGovernor->>KlerosGovernor: Generate Hash
KlerosGovernor->>Blockchain: Store Transaction Hash
Blockchain-->>KlerosGovernor: Confirm Storage
KlerosGovernor-->>User: Transaction Submitted
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (1)
contracts/src/arbitration/KlerosGovernor.sol (1)
Line range hint
218-236: Add validation for transaction listWhile the hash calculation logic is sound, additional validations would improve security:
- Empty transaction list check
- Empty transaction data validation
+require(_target.length > 0, "Empty transaction list"); bytes32 listHash; bytes32 currentTxHash; uint256 readingPosition; for (uint256 i = 0; i < _target.length; i++) { bytes memory readData = new bytes(_dataSize[i]); + require(_dataSize[i] > 0, "Empty transaction data"); Transaction storage transaction = submission.txs.push();
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📒 Files selected for processing (1)
contracts/src/arbitration/KlerosGovernor.sol(7 hunks)
🔇 Additional comments (2)
contracts/src/arbitration/KlerosGovernor.sol (2)
231-232: LGTM: Secure hash calculation
The hash calculation using keccak256 with proper abi.encodePacked is secure and prevents hash collisions.
217-217: 🛠️ Refactor suggestion
Add explicit deposit calculation check
The deposit calculation should be checked for potential overflow, even though Solidity 0.8+ has built-in checks.
-submission.deposit = submissionBaseDeposit + arbitrator.arbitrationCost(arbitratorExtraData);
+uint256 arbitrationCost = arbitrator.arbitrationCost(arbitratorExtraData);
+require(arbitrationCost <= type(uint256).max - submissionBaseDeposit, "Deposit calculation overflow");
+submission.deposit = submissionBaseDeposit + arbitrationCost;
CappedMath is removed because for the most part it's not needed as it was initially used to prevent underflows/overflows which isn't relevant for 0.8.0. In a couple of cases it was relevant still and I implemented a manual check there.
Requirement for tx ordering is removed since it becomes an issue where the txs in the list must be executed in a particular order (e.g. during
minStakechanges in courts). On the other hand, removing it now makes possible to submit lists with the same txs but in different order with an attempt "to steal" the list in cases where order of execution doesn't matter. In this case the list that was submitted the first should be chosen.There is no way to automate this process within the contract, since it's not possible to determine automatically whether the order of the list matters or not, thus the process of choosing the list should be done by the jurors, which might require some policy changes to address the cases of duplication.
PR-Codex overview
This PR focuses on simplifying arithmetic operations in the
KlerosGovernorcontract by removing theCappedMathlibrary and replacing its methods with standard arithmetic operations. This enhances code clarity and reduces complexity.Detailed summary
using CappedMath for uint256;.addCapwith standard addition.subCapwith standard subtraction.Summary by CodeRabbit
Bug Fixes
Refactor
CappedMathlibrary, simplifying arithmetic expressions.Documentation