linux-kernel - Re: [PATCH v2 02/10] kfuzztest: add user-facing API and data structures

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Message-ID: <CAG_fn=ULHR_n+w=apc_g8Pe+MxXwNnQiRjOTRukzEiSAFK7hOQ@mail.gmail.com>
Date: Fri, 19 Sep 2025 17:05:13 +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 02/10] kfuzztest: add user-facing API and data structures

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 the foundational user-facing components for the KFuzzTest framework.
> This includes the main API header <linux/kfuzztest.h>, the Kconfig
> option to enable the feature, and the required linker script changes
> which introduce three new ELF sections in vmlinux.
>
> Note that KFuzzTest is intended strictly for debug builds only, and
> should never be enabled in a production build. The fact that it exposes
> internal kernel functions and state directly to userspace may constitute
> a serious security vulnerability if used for any reason other than
> testing.
>
> The header defines:
> - The FUZZ_TEST() macro for creating test targets.
> - The data structures required for the binary serialization format,
>   which allows passing complex inputs from userspace.
> - The metadata structures for test targets, constraints and annotations,
>   which are placed in dedicated ELF sections (.kfuzztest_*) for
>   discovery.
>
> This patch only adds the public interface and build integration; no
> runtime logic is included.
>
> Signed-off-by: Ethan Graham <ethangraham@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>