An Agent Can Be Upgraded Even if There Is No New Implementation
Agents can be upgraded to a new implementation, and only the Agent's owner can call the upgrade function:\\n```\\nfunction upgradeAgent(\\n address agent\\n) external returns (address newAgent) {\\n IAgent oldAgent = IAgent(agent);\\n address owner = IAuth(address(oldAgent)).owner();\\n uint256 agentId = agents[agent];\\n // only the Agent's owner can upgrade, and only a registered agent can be upgraded\\n if (owner != msg.sender || agentId == 0) revert Unauthorized();\\n // deploy a new instance of Agent with the same ID and auth\\n newAgent = GetRoute.agentDeployer(router).deploy(\\n router,\\n agentId,\\n owner,\\n IAuth(address(oldAgent)).operator()\\n );\\n // Register the new agent and unregister the old agent\\n agents[newAgent] = agentId;\\n // transfer funds from old agent to new agent and mark old agent as decommissioning\\n oldAgent.decommissionAgent(newAgent);\\n // delete the old agent from the registry\\n agents[agent] = 0;\\n}\\n```\\n\\nThe issue is that the owner can trigger the upgrade even if no new implementation exists. Multiple possible problems derive from it.\\nUpgrading to the current implementation of the Agent will break the logic because the current version is not calling the `migrateMiner` function, so all the miners will stay with the old Agent, and their funds will be lost.\\nThe owner can accidentally trigger multiple upgrades simultaneously, leading to a loss of funds (https://github.com/ConsenSysDiligence/glif-audit-2023-04/issues/2).\\nThe owner also has no control over the new version of the Agent. To increase decentralization, it's better to pass the deployer's address as a parameter additionally.
Ensure the upgrades can only happen when there is a new version of an Agent, and the owner controls this version.
```\\nfunction upgradeAgent(\\n address agent\\n) external returns (address newAgent) {\\n IAgent oldAgent = IAgent(agent);\\n address owner = IAuth(address(oldAgent)).owner();\\n uint256 agentId = agents[agent];\\n // only the Agent's owner can upgrade, and only a registered agent can be upgraded\\n if (owner != msg.sender || agentId == 0) revert Unauthorized();\\n // deploy a new instance of Agent with the same ID and auth\\n newAgent = GetRoute.agentDeployer(router).deploy(\\n router,\\n agentId,\\n owner,\\n IAuth(address(oldAgent)).operator()\\n );\\n // Register the new agent and unregister the old agent\\n agents[newAgent] = agentId;\\n // transfer funds from old agent to new agent and mark old agent as decommissioning\\n oldAgent.decommissionAgent(newAgent);\\n // delete the old agent from the registry\\n agents[agent] = 0;\\n}\\n```\\n