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syzkaller
What syzkaller is
syzkaller is a free, open-source fuzzing tool for operating-system kernels and syscall interfaces. It can generate new inputs and mutate existing ones to exercise targets including FreeBSD, Fuchsia, gVisor, Linux, NetBSD, OpenBSD, and Windows. Coverage guidance helps show which areas fuzzing reaches, while crash triage supports reviewing failures discovered during runs. Execution is local, and CI/CD support is listed for incorporating fuzzing into automated workflows. The project lists Linux, macOS, and Windows as platforms. Its scope is system software: kernels and syscall interfaces rather than general application code. Users can combine generation and mutation while examining coverage information and triaging crashes. The project is available through its GitHub website. Because the listed targets are operating-system kernels and syscall interfaces, syzkaller is aimed at teams working on those system-level components.
Who it suits
It suits security and systems teams fuzzing supported operating-system kernels or syscall interfaces. It is also relevant when local execution, coverage guidance, crash triage, or CI/CD support is needed.
What it does well
- Free and open source
- Generates and mutates inputs
- Supports multiple operating-system targets
- Provides coverage guidance
- Includes crash triage and CI/CD support
What to know first
- Focused on kernels and syscall interfaces
- Execution is local
- Not described for general application testing
Verdict
syzkaller provides generation, mutation, coverage guidance, and crash triage for kernel and syscall-interface fuzzing. Its supported targets and local execution model make it a system-level testing tool rather than a general application fuzzer.
Where syzkaller stands on Freedom251
- Fuzz Testing Software#25 of 26