linux-kernel - Re: [PATCH v2 5/5] kasan: Extend KASAN mode kernel parameter

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Date:   Wed, 6 Oct 2021 11:58:31 +0100
From:   Will Deacon <will@...nel.org>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v2 5/5] kasan: Extend KASAN mode kernel parameter

On Mon, Oct 04, 2021 at 09:22:53PM +0100, Vincenzo Frascino wrote:
> Architectures supported by KASAN_HW_TAGS can provide an asymmetric mode
> of execution. On an MTE enabled arm64 hw for example this can be
> identified with the asymmetric tagging mode of execution. In particular,
> when such a mode is present, the CPU triggers a fault on a tag mismatch
> during a load operation and asynchronously updates a register when a tag
> mismatch is detected during a store operation.
> 
> Extend the KASAN HW execution mode kernel command line parameter to
> support asymmetric mode.
> 
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Andrey Konovalov <andreyknvl@...il.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  Documentation/dev-tools/kasan.rst |  7 +++++--
>  lib/test_kasan.c                  |  2 +-
>  mm/kasan/hw_tags.c                | 27 ++++++++++++++++++++++-----
>  mm/kasan/kasan.h                  | 22 +++++++++++++++++++---
>  mm/kasan/report.c                 |  2 +-
>  5 files changed, 48 insertions(+), 12 deletions(-)

I'll wait for an Ack from Andrey or Marco before queueing this.

Will