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Fix EIP712 for delegatecalls #2852

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merged 4 commits into from Oct 6, 2021
Merged

Fix EIP712 for delegatecalls #2852

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141f245
Fix EIP712 for delegatecalls
k06a Sep 9, 2021
c3e46d1
Merge branch 'master' into fix/eip712-for-delegatecalls
Amxx Oct 6, 2021
4bf09eb
add Changelog entry
Amxx Oct 6, 2021
a7f4be3
Update CHANGELOG.md
frangio Oct 6, 2021
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -5,6 +5,7 @@
* `Ownable`: add an internal `_transferOwnership(address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
* `AccessControl`: add internal `_grantRole(bytes32,address)` and `_revokeRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
* `AccessControl`: mark `_setupRole(bytes32,address)` as deprecated in favor of `_grantRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
* `EIP712`: cache `address(this)` to immutable storage to avoid potential issues if a vanilla contract is used in a delegatecall context. ([#2852](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2852))

## 4.3.2 (2021-09-14)

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4 changes: 3 additions & 1 deletion contracts/utils/cryptography/draft-EIP712.sol
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Expand Up @@ -29,6 +29,7 @@ abstract contract EIP712 {
// invalidate the cached domain separator if the chain id changes.
bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
uint256 private immutable _CACHED_CHAIN_ID;
address private immutable _CACHED_THIS;

bytes32 private immutable _HASHED_NAME;
bytes32 private immutable _HASHED_VERSION;
Expand Down Expand Up @@ -58,14 +59,15 @@ abstract contract EIP712 {
_HASHED_VERSION = hashedVersion;
_CACHED_CHAIN_ID = block.chainid;
_CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
_CACHED_THIS = address(this);
_TYPE_HASH = typeHash;
}

/**
* @dev Returns the domain separator for the current chain.
*/
function _domainSeparatorV4() internal view returns (bytes32) {
if (block.chainid == _CACHED_CHAIN_ID) {
if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
return _CACHED_DOMAIN_SEPARATOR;
} else {
return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
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