linux-kernel - Re: [PATCH v5 1/2] kasan/hw-tags: introduce kasan.write

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Message-ID: <aLVx8Pxq7eZgu/8A@e129823.arm.com>
Date: Mon, 1 Sep 2025 11:14:08 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: Andrey Konovalov <andreyknvl@...il.com>
Cc: ryabinin.a.a@...il.com, glider@...gle.com, dvyukov@...gle.com,
	vincenzo.frascino@....com, corbet@....net, catalin.marinas@....com,
	will@...nel.org, akpm@...ux-foundation.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 v5 1/2] kasan/hw-tags: introduce kasan.write_only option

Hi Andery,

[...]

> > diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
> > index 0a1418ab72fd..fe1a1e152275 100644
> > --- a/Documentation/dev-tools/kasan.rst
> > +++ b/Documentation/dev-tools/kasan.rst
> > @@ -143,6 +143,9 @@ disabling KASAN altogether or controlling its features:
> >    Asymmetric mode: a bad access is detected synchronously on reads and
> >    asynchronously on writes.
> >
> > +- ``kasan.write_only=off`` or ``kasan.write_only=on`` controls whether KASAN
> > +  checks the write (store) accesses only or all accesses (default: ``off``)
>
> Nit: a dot missing at the end of the sentence.

Thanks! I'll add it.

[...]

> >  #ifdef CONFIG_KASAN_HW_TAGS
> > diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
> > index 9a6927394b54..334e9e84983e 100644
> > --- a/mm/kasan/hw_tags.c
> > +++ b/mm/kasan/hw_tags.c
> > @@ -41,9 +41,16 @@ enum kasan_arg_vmalloc {
> >         KASAN_ARG_VMALLOC_ON,
> >  };
> >
> > +enum kasan_arg_write_only {
> > +       KASAN_ARG_WRITE_ONLY_DEFAULT,
> > +       KASAN_ARG_WRITE_ONLY_OFF,
> > +       KASAN_ARG_WRITE_ONLY_ON,
> > +};
> > +
> >  static enum kasan_arg kasan_arg __ro_after_init;
> >  static enum kasan_arg_mode kasan_arg_mode __ro_after_init;
> >  static enum kasan_arg_vmalloc kasan_arg_vmalloc __initdata;
> > +static enum kasan_arg_write_only kasan_arg_write_only __ro_after_init;
> >
> >  /*
> >   * Whether KASAN is enabled at all.
> > @@ -67,6 +74,9 @@ DEFINE_STATIC_KEY_FALSE(kasan_flag_vmalloc);
> >  #endif
> >  EXPORT_SYMBOL_GPL(kasan_flag_vmalloc);
> >
> > +/* Whether to check write access only. */
>
> Nit: access => accesses

Thanks. I'll change it.

[...]

> For the KASAN parts:
>
> Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>
>
> Thank you!

Thanks :D

--
Sincerely,
Yeoreum Yun