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Add nonReentrant to relayMessage() #172

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Jan 12, 2021
Merged

Add nonReentrant to relayMessage() #172

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5886e76
Add nonReentrant to all public functions on CrossDomainMessengers
maurelian Jan 9, 2021
2041cbc
Merge branch 'master' into fix/reentryOnBridge
maurelian Jan 11, 2021
25925e2
Improve contract description comments
maurelian Jan 12, 2021
a3e3f56
remove extraneous modifier
maurelian Jan 12, 2021
52af9e1
Merge branch 'master' into fix/reentryOnBridge
maurelian Jan 12, 2021
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3 changes: 2 additions & 1 deletion contracts/optimistic-ethereum/OVM/bridge/OVM_BaseCrossDomainMessenger.sol
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Expand Up @@ -40,9 +40,10 @@ abstract contract OVM_BaseCrossDomainMessenger is iOVM_BaseCrossDomainMessenger,
address _target,
bytes memory _message,
uint32 _gasLimit
) nonReentrant
)
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override
public
nonReentrant
{
bytes memory xDomainCalldata = _getXDomainCalldata(
_target,
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4 changes: 4 additions & 0 deletions contracts/optimistic-ethereum/OVM/bridge/OVM_L1CrossDomainMessenger.sol
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Expand Up @@ -7,6 +7,7 @@ import { Lib_OVMCodec } from "../../libraries/codec/Lib_OVMCodec.sol";
import { Lib_AddressResolver } from "../../libraries/resolver/Lib_AddressResolver.sol";
import { Lib_AddressManager } from "../../libraries/resolver/Lib_AddressManager.sol";
import { Lib_SecureMerkleTrie } from "../../libraries/trie/Lib_SecureMerkleTrie.sol";
import { Lib_ReentrancyGuard } from "../../libraries/utils/Lib_ReentrancyGuard.sol";

/* Interface Imports */
import { iOVM_L1CrossDomainMessenger } from "../../iOVM/bridge/iOVM_L1CrossDomainMessenger.sol";
Expand All @@ -18,6 +19,7 @@ import { OVM_BaseCrossDomainMessenger } from "./OVM_BaseCrossDomainMessenger.sol

/**
* @title OVM_L1CrossDomainMessenger
* @dev This contract lives on L1. It sends messages to L2, and relays them from L2
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*/
contract OVM_L1CrossDomainMessenger is iOVM_L1CrossDomainMessenger, OVM_BaseCrossDomainMessenger, Lib_AddressResolver {

Expand Down Expand Up @@ -81,6 +83,7 @@ contract OVM_L1CrossDomainMessenger is iOVM_L1CrossDomainMessenger, OVM_BaseCros
)
override
public
nonReentrant
onlyRelayer()
{
bytes memory xDomainCalldata = _getXDomainCalldata(
Expand Down Expand Up @@ -140,6 +143,7 @@ contract OVM_L1CrossDomainMessenger is iOVM_L1CrossDomainMessenger, OVM_BaseCros
)
override
public
nonReentrant
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FWIW, this code path speaks directly to the rollup contracts (OVM_CanonicalTransactionChain.enqueue specifically) so it should not be re-enterable based on the behavior of that target, so it should not be needed.

I'd recommend removing it, because the L1 SSTORE is gonna be expensive. If you think that it's worth keeping, we can, but we should also add it to sendMessage, since the functions serve similar purposes.

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OVM_BaseCrossDomainMessenger.sendMessage() already has the nonReentrant modifier on it. You can see above that I moved it down a couple lines to improve the style. But looking at both sendMessage and replayMessage more closely, I agree that it looks pretty safe to remove them.

{
bytes memory xDomainCalldata = _getXDomainCalldata(
_target,
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3 changes: 3 additions & 0 deletions contracts/optimistic-ethereum/OVM/bridge/OVM_L2CrossDomainMessenger.sol
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Expand Up @@ -5,6 +5,7 @@ pragma experimental ABIEncoderV2;

/* Library Imports */
import { Lib_AddressResolver } from "../../libraries/resolver/Lib_AddressResolver.sol";
import { Lib_ReentrancyGuard } from "../../libraries/utils/Lib_ReentrancyGuard.sol";

/* Interface Imports */
import { iOVM_L2CrossDomainMessenger } from "../../iOVM/bridge/iOVM_L2CrossDomainMessenger.sol";
Expand All @@ -17,6 +18,7 @@ import { OVM_BaseCrossDomainMessenger } from "./OVM_BaseCrossDomainMessenger.sol
/**
* @title OVM_L2CrossDomainMessenger
* @dev L2 CONTRACT (COMPILED)
* This contract lives on L2. It sends messages to L1, and relays them from L1
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*/
contract OVM_L2CrossDomainMessenger is iOVM_L2CrossDomainMessenger, OVM_BaseCrossDomainMessenger, Lib_AddressResolver {

Expand Down Expand Up @@ -50,6 +52,7 @@ contract OVM_L2CrossDomainMessenger is iOVM_L2CrossDomainMessenger, OVM_BaseCros
uint256 _messageNonce
)
override
nonReentrant
public
{
require(
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