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Add GovernorTimelockControl address to TimelockController salt #4432

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merged 13 commits into from
Jul 12, 2023
Merged

Add GovernorTimelockControl address to TimelockController salt #4432

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4a9a6aa
Add GovernorTimelockControl address to TimelockController salt
ernestognw Jul 6, 2023
00ff5e1
Add changeset
ernestognw Jul 6, 2023
b63d484
Merge branch 'master' into lib-834-use-governor-address-in-id-hash
ernestognw Jul 9, 2023
bcb0b84
Merge branch 'master' into lib-834-use-governor-address-in-id-hash
ernestognw Jul 12, 2023
fd0ef64
add logging
frangio Jul 12, 2023
5903861
remove only
frangio Jul 12, 2023
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frangio Jul 12, 2023
29a1b1d
fix only
frangio Jul 12, 2023
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frangio Jul 12, 2023
225c6ec
fix timelockSalt
frangio Jul 12, 2023
3563815
remove console.log
frangio Jul 12, 2023
e775b46
add period
frangio Jul 12, 2023
9dd7f39
Update .changeset/purple-cats-cheer.md
ernestognw Jul 12, 2023
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5 changes: 5 additions & 0 deletions .changeset/purple-cats-cheer.md
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@@ -0,0 +1,5 @@
---
'openzeppelin-solidity': major
---

`GovernorTimelockControl`: Add the Governor instance address as part of the TimelockController operation `salt` to avoid operation id collisions between governors using the same TimelockController.
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17 changes: 14 additions & 3 deletions contracts/governance/extensions/GovernorTimelockControl.sol
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Expand Up @@ -106,8 +106,9 @@ abstract contract GovernorTimelockControl is IGovernorTimelock, Governor {
}

uint256 delay = _timelock.getMinDelay();
_timelockIds[proposalId] = _timelock.hashOperationBatch(targets, values, calldatas, 0, descriptionHash);
_timelock.scheduleBatch(targets, values, calldatas, 0, descriptionHash, delay);
bytes32 salt = _timelockSalt(descriptionHash);
_timelockIds[proposalId] = _timelock.hashOperationBatch(targets, values, calldatas, 0, salt);
_timelock.scheduleBatch(targets, values, calldatas, 0, salt, delay);
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The decision to not have schedule and scheduleBatch return the id that they compute really was a bad one.


emit ProposalQueued(proposalId, block.timestamp + delay);

Expand All @@ -125,7 +126,7 @@ abstract contract GovernorTimelockControl is IGovernorTimelock, Governor {
bytes32 descriptionHash
) internal virtual override {
// execute
_timelock.executeBatch{value: msg.value}(targets, values, calldatas, 0, descriptionHash);
_timelock.executeBatch{value: msg.value}(targets, values, calldatas, 0, _timelockSalt(descriptionHash));
// cleanup for refund
delete _timelockIds[proposalId];
}
Expand Down Expand Up @@ -177,4 +178,14 @@ abstract contract GovernorTimelockControl is IGovernorTimelock, Governor {
emit TimelockChange(address(_timelock), address(newTimelock));
_timelock = newTimelock;
}

/**
* @dev Computes the {TimelockController} operation salt.
*
* It is computed with the governor address itself to avoid collisions across governor instances using the
* same timelock.
*/
function _timelockSalt(bytes32 descriptionHash) private view returns (bytes32) {
return bytes20(address(this)) ^ descriptionHash;
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I decided to use an ^ instead of a keccak256 because it's cheaper and it doesn't matter if the preimage is known since the objective is to avoid unintentional collisions between governors.

If a governor instance wants to purposely block another, it'll require to mine the most significant 20 bytes of the descriptionHash which is infeasible.

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That is an interesting proposal. I'd have done a full hash, just because it would have been clearer to everyone what is going on ... but IMO that is also a valid option.

}
}
8 changes: 6 additions & 2 deletions test/governance/extensions/GovernorTimelockControl.test.js
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Expand Up @@ -37,6 +37,9 @@ contract('GovernorTimelockControl', function (accounts) {

for (const { mode, Token } of TOKENS) {
describe(`using ${Token._json.contractName}`, function () {
const timelockSalt = (address, descriptionHash) =>
'0x' + web3.utils.toBN(address).shln(96).xor(web3.utils.toBN(descriptionHash)).toString(16, 64);

beforeEach(async function () {
const [deployer] = await web3.eth.getAccounts();

Expand Down Expand Up @@ -86,10 +89,11 @@ contract('GovernorTimelockControl', function (accounts) {
],
'<proposal description>',
);

this.proposal.timelockid = await this.timelock.hashOperationBatch(
...this.proposal.shortProposal.slice(0, 3),
'0x0',
this.proposal.shortProposal[3],
timelockSalt(this.mock.address, this.proposal.shortProposal[3]),
);
});

Expand Down Expand Up @@ -204,7 +208,7 @@ contract('GovernorTimelockControl', function (accounts) {
await this.timelock.executeBatch(
...this.proposal.shortProposal.slice(0, 3),
'0x0',
this.proposal.shortProposal[3],
timelockSalt(this.mock.address, this.proposal.shortProposal[3]),
);

await expectRevertCustomError(this.helper.execute(), 'GovernorUnexpectedProposalState', [
Expand Down