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

[Will Deacon]

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@xxxxxxxxxx>
> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
> Cc: Alexander Potapenko <glider@xxxxxxxxxx>
> Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
> Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> ---
>  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