An extensible fuzzing framework for finding semantic bugs in file systems like ext4, Btrfs, and F2FS.
Hydra is an extensible fuzzing framework designed to find semantic bugs in file systems. It automates the testing of file system operations like those in ext4, Btrfs, and F2FS to uncover issues such as crash consistency errors. The framework provides built-in tools for input mutation, execution, and bug reproduction, allowing developers to focus on writing custom checkers for specific bug types.
File system developers, kernel engineers, and security researchers who need to test and harden file system implementations against semantic bugs. It is also suitable for academic researchers studying file system reliability and fuzzing techniques.
Hydra offers a specialized, modular framework for file system fuzzing with proven effectiveness, having discovered 11 new crash consistency bugs in production and verified file systems. Its extensible design allows easy integration of custom checkers, making it adaptable to new file systems and bug classes without extensive re-engineering.
Hydra: an Extensible Fuzzing Framework for Finding Semantic Bugs in File Systems
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The included SymC3 checker has found 11 new crash consistency bugs in production and verified file systems like ext4 and Btrfs, as cited in the README, demonstrating real-world effectiveness.
Developers can focus on writing custom checkers for specific bug types without rebuilding the entire framework, enabling adaptation to new file systems, per the project's philosophy.
Integrates all necessary components—multi-dimensional input mutators, feedback engines, and a bug reproducer with minimizer—streamlining the file system testing process.
Allows running multiple fuzzer instances in parallel with separate log directories, as shown in setup instructions, for efficient, scalable testing.
Officially requires Ubuntu 18.04 and has known issues with Ubuntu 20.04, restricting use on modern systems until fixes are available.
Involves compiling for each file system individually (e.g., make build-btrfs-imgwrp) and running multiple shell scripts, which can be error-prone and time-consuming.
Focused solely on file system fuzzing, lacking features for other software domains, reducing versatility for broader testing needs.