linux-kernel - Re: [PATCH v1 01/10] mm/kasan: implement kasan_poison

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Message-ID: <CAG_fn=U-SH5u4Lv3CcqKVHnK1ewrF46AF3JU1eiAh-JYxj86sg@mail.gmail.com>
Date: Tue, 16 Sep 2025 11:34:56 +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, 
	tarasmadan@...gle.com
Subject: Re: [PATCH v1 01/10] mm/kasan: implement kasan_poison_range

On Tue, Sep 16, 2025 at 11:01 AM Ethan Graham
<ethan.w.s.graham@...il.com> wrote:
>
> From: Ethan Graham <ethangraham@...gle.com>
>
> Introduce a new helper function, kasan_poison_range(), to encapsulate
> the logic for poisoning an arbitrary memory range of a given size, and
> expose it publically in <include/linux/kasan.h>.
>
> This is a preparatory change for the upcoming KFuzzTest patches, which
> requires the ability to poison the inter-region padding in its input
> buffers.
>
> No functional change to any other subsystem is intended by this commit.
>
> ---
> v3:
> - Enforce KASAN_GRANULE_SIZE alignment for the end of the range in
>   kasan_poison_range(), and return -EINVAL when this isn't respected.
> ---
>
> Signed-off-by: Ethan Graham <ethangraham@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>