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Date: Fri, 15 Aug 2025 12:19:32 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
To: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Yeoreum Yun <yeoreum.yun@arm.com>, glider@google.com,
	Marco Elver <elver@google.com>, ryabinin.a.a@gmail.com,
	dvyukov@google.com, vincenzo.frascino@arm.com, corbet@lwn.net,
	will@kernel.org, akpm@linux-foundation.org,
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	hardevsinh.palaniya@siliconsignals.io, david@redhat.com,
	yang@os.amperecomputing.com, kasan-dev@googlegroups.com,
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	linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
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Subject: Re: [PATCH v2 1/2] kasan/hw-tags: introduce kasan.store_only option
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References: <20250813175335.3980268-1-yeoreum.yun@arm.com>
 <20250813175335.3980268-2-yeoreum.yun@arm.com>
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On Thu, Aug 14, 2025 at 07:03:35AM +0200, Andrey Konovalov wrote:
> On Wed, Aug 13, 2025 at 7:53 PM Yeoreum Yun <yeoreum.yun@arm.com> wrote:
> > Since Armv8.9, FEATURE_MTE_STORE_ONLY feature is introduced to restrict
> > raise of tag check fault on store operation only.
> > Introcude KASAN store only mode based on this feature.
> >
> > KASAN store only mode restricts KASAN checks operation for store only and
> > omits the checks for fetch/read operation when accessing memory.
> > So it might be used not only debugging enviroment but also normal
> > enviroment to check memory safty.
> >
> > This features can be controlled with "kasan.store_only" arguments.
> > When "kasan.store_only=on", KASAN checks store only mode otherwise
> > KASAN checks all operations.
> 
> I'm thinking if we should name this "kasan.write_only" instead of
> "kasan.store_only". This would align the terms with the
> "kasan.fault=panic_on_write" parameter we already have. But then it
> would be different from "FEATURE_MTE_STORE_ONLY", which is what Arm
> documentation uses (right?).

"write_only" works for me, kasan is meant to be generic even though it
currently closely follows the arm nomenclature.

-- 
Catalin