Janus
A state-of-the-art file system fuzzer for Linux that explores both image and syscall input spaces simultaneously to find memory corruptions.
What is Janus?
Janus is a file system fuzzer for Linux that discovers memory corruptions in in-kernel file systems by exploring both disk images and system call sequences simultaneously. It addresses the challenge of comprehensive file system testing by treating image structure and file operations as a two-dimensional input space. The tool has found approximately 100 unique crashes with 32 CVEs assigned in mainstream file systems.
Security researchers, kernel developers, and file system engineers who need to test the robustness and security of Linux file system implementations. It's particularly valuable for those conducting systematic security assessments of storage systems.
Janus offers unique two-dimensional input space exploration that traditional fuzzers lack, enabling discovery of complex bugs that require specific combinations of image states and file operations. Its integration with LKL provides a lightweight, reproducible testing environment without requiring full virtual machines.
Overview
Janus: a state-of-the-art file system fuzzer on Linux
Use Cases
Best For
- Finding memory corruption vulnerabilities in Linux file system implementations
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