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

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Message-ID: <CAG_fn=VXNBH-1QDAy+xR_ubUr0rZxmPBpFWov1y+7a65-mtGmA@mail.gmail.com>
Date: Fri, 19 Sep 2025 17:05:59 +0200
From: Alexander Potapenko <glider@...gle.com>
To: Ethan Graham <ethan.w.s.graham@...il.com>
Cc: ethangraham@...gle.com, andreyknvl@...il.com, andy@...nel.org, 
	brauner@...nel.org, brendan.higgins@...ux.dev, davem@...emloft.net, 
	davidgow@...gle.com, dhowells@...hat.com, dvyukov@...gle.com, 
	elver@...gle.com, herbert@...dor.apana.org.au, ignat@...udflare.com, 
	jack@...e.cz, jannh@...gle.com, johannes@...solutions.net, 
	kasan-dev@...glegroups.com, kees@...nel.org, kunit-dev@...glegroups.com, 
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, lukas@...ner.de, rmoar@...gle.com, shuah@...nel.org, 
	sj@...nel.org, tarasmadan@...gle.com
Subject: Re: [PATCH v2 04/10] tools: add kfuzztest-bridge utility

On Fri, Sep 19, 2025 at 4:58 PM Ethan Graham <ethan.w.s.graham@...il.com> wrote:
>
> From: Ethan Graham <ethangraham@...gle.com>
>
> 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@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>