linux-kernel - Re: [PATCH v2 08/10] drivers/auxdisplay: add a KFuzzTest for parse

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Message-ID: <CAG_fn=Xvkz_-UGuR8_4Jb_9HmwQn7dTHdJuDRe6usZX61CF0xw@mail.gmail.com>
Date: Fri, 19 Sep 2025 17:07:14 +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, 
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	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 08/10] drivers/auxdisplay: add a KFuzzTest for parse_xy()

On Fri, Sep 19, 2025 at 4:58 PM Ethan Graham <ethan.w.s.graham@...il.com> wrote:
>
> From: Ethan Graham <ethangraham@...gle.com>
>
> Add a KFuzzTest fuzzer for the parse_xy() function, located in a new
> file under /drivers/auxdisplay/tests.
>
> To validate the correctness and effectiveness of this KFuzzTest target,
> a bug was injected into parse_xy() like so:
>
> drivers/auxdisplay/charlcd.c:179
> - s = p;
> + s = p + 1;
>
> Although a simple off-by-one bug, it requires a specific input sequence
> in order to trigger it, thus demonstrating the power of pairing
> KFuzzTest with a coverage-guided fuzzer like syzkaller.
>
> Signed-off-by: Ethan Graham <ethangraham@...gle.com>
Acked-by: Alexander Potapenko <glider@...gle.com>