linux-kernel - Re: [PATCH v6 1/2] kasan/hw-tags: introduce kasan.write

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Message-ID: <aLYCiE6lGlIkIJX+@e129823.arm.com>
Date: Mon, 1 Sep 2025 21:31:04 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
	dvyukov@...gle.com, vincenzo.frascino@....com, corbet@....net,
	catalin.marinas@....com, will@...nel.org,
	scott@...amperecomputing.com, jhubbard@...dia.com,
	pankaj.gupta@....com, leitao@...ian.org, kaleshsingh@...gle.com,
	maz@...nel.org, broonie@...nel.org, oliver.upton@...ux.dev,
	james.morse@....com, ardb@...nel.org,
	hardevsinh.palaniya@...iconsignals.io, david@...hat.com,
	yang@...amperecomputing.com, kasan-dev@...glegroups.com,
	workflows@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v6 1/2] kasan/hw-tags: introduce kasan.write_only option

> On Mon,  1 Sep 2025 11:46:22 +0100 Yeoreum Yun <yeoreum.yun@....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 write only mode based on this feature.
> >
> > KASAN write only mode restricts KASAN checks operation for write only and
> > omits the checks for fetch/read operations 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.write_only" arguments.
> > When "kasan.write_only=on", KASAN checks write operation only otherwise
> > KASAN checks all operations.
> >
> > This changes the MTE_STORE_ONLY feature as BOOT_CPU_FEATURE like
> > ARM64_MTE_ASYMM so that makes it initialise in kasan_init_hw_tags()
> > with other function together.
> >
> > ...
> >
> >
> > -	pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s)\n",
> > +	pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s, write_only=%s\n",
> >  		kasan_mode_info(),
>
> This lost the closing ")" in the printk control string.  I fixed that
> up while resolving rejects.

Oops.. Thanks and Sorry for my mistake :( ...

--
Sincerely,
Yeoreum Yun