🔍 Smart Contract Audit — FusePoolDirectory.sol

Auditor: Aayush
Protocol: Rari/Fuse (Compound Fork)
Date: April 19, 2025
Contract Audited: FusePoolDirectory.sol
Audit Type: Manual Code Review + Foundry-Based Testing
Status: ✅ Completed

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📄 Audit Summary

This audit reviews the security, correctness, and gas efficiency of FusePoolDirectory.sol from Rari/Fuse Protocol.
The contract is responsible for creating and registering Fuse interest rate pools, and it uses a proxy pattern via Unitroller and Comptroller.

✅ Key Fixes & Improvements

• Reentrancy protection added to deployPool()
• Contract validation and zero-address checks added
• Redundant storage writes optimized
• Event emission and pool duplication protections enforced
• 100% test coverage via Foundry

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📄 Full Audit Report

🔗 Download the full audit report (PDF)

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🧪 Test Suite

Foundry-based unit and fuzz tests covering:

• ✅ Reentrancy protection
• ✅ Input validation
• ✅ Whitelist logic
• ✅ Event emission
• ✅ Gas optimization logic

🔗 View Test Suite on GitHub Gist

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🛠️ Tools Used

• Foundry
• Slither (Static Analysis)
• Manual Code Review
• GitHub Actions (for CI)

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📌 Notes

⚠️ The original contract was written in Solidity 0.6.12, which does not support custom errors.
If the protocol is upgraded to Solidity ^0.8.0, we recommend using custom errors instead of require() to save gas.

Security First. Gas Second. Clarity Always.