Question 1

How to set up Hydra on Ubuntu 20.04?

Accepted Answer

Hydra officially requires Ubuntu 18.04 and has compatibility issues with 20.04; the team is working on a fix, so for now, use 18.04 or check the repository for updates. Workarounds might involve manual patches or virtual machines.

Question 2

Hydra vs AFL for file system fuzzing?

Accepted Answer

Hydra is specialized for file systems with built-in tools for semantic bugs like crash consistency, while AFL is general-purpose. Hydra's modular design and file system-specific features make it more targeted, but AFL is better for diverse software types.

Question 3

How to write a custom checker in Hydra?

Accepted Answer

Hydra provides an extensible checker interface; start by examining the SymC3 checker in src/emulator for examples. Focus on implementing bug detection logic, as the framework handles mutation and execution automatically.

Question 4

What file systems does Hydra support?

Accepted Answer

Hydra supports Linux file systems including ext4, Btrfs, F2FS, and XFS, as mentioned in the setup instructions. It can be extended to others via custom checkers, but out-of-the-box support is limited to these.

Question 5

Can Hydra fuzz Windows or macOS file systems?

Accepted Answer

No, Hydra is designed for Linux file systems and uses a LibOS-based executor for isolation. Porting to other OSes would require significant modifications to the framework and checkers.

Question 6

How does Hydra reproduce and minimize bug test cases?

Accepted Answer

Hydra includes an automated bug reproducer with a minimizer that shrinks test cases to their simplest form, aiding in debugging. This is built into the framework, so no extra tools are needed.

Hydra

What is Hydra?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions