Re: [PATCH v2 04/10] tools: add kfuzztest-bridge utility

[Alexander Potapenko]

On Fri, Sep 19, 2025 at 4:58 PM Ethan Graham <ethan.w.s.graham@xxxxxxxxx> wrote:
>
> From: Ethan Graham <ethangraham@xxxxxxxxxx>
>
> Introduce the kfuzztest-bridge tool, a userspace utility for sending
> structured inputs to KFuzzTest harnesses via debugfs.
>
> The bridge takes a textual description of the expected input format, a
> file containing random bytes, and the name of the target fuzz test. It
> parses the description, encodes the random data into the binary format
> expected by the kernel, and writes the result to the corresponding
> debugfs entry.
>
> This allows for both simple manual testing and integration with
> userspace fuzzing engines. For example, it can be used for smoke testing
> by providing data from /dev/urandom, or act as a bridge for blob-based
> fuzzers (e.g., AFL) to target KFuzzTest harnesses.
>
> Signed-off-by: Ethan Graham <ethangraham@xxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>