# Re: \[PATCH 25/35\] kasan: introduce CONFIG\_KASAN\_HW\_TAGS

- From: Vincenzo Frascino \<vincenzo.frascino@arm.com\>
- Date: 2020-08-27 11:42:30 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2020/08/6084925
- Thread: https://ratatoskr.run/linux-arm-kernel/2020/08/6068760/t.md

```text
Hi Andrey,

On 8/14/20 6:27 PM, Andrey Konovalov wrote:
> +config·KASAN_HW_TAGS
> +» bool·"Hardware·tag-based·mode"
> +» depends·on·HAVE_ARCH_KASAN_HW_TAGS
> +» depends·on·SLUB
> +» help
> +» ··Enables·hardware·tag-based·KASAN·mode.
> +
> +» ··This·mode·requires·both·Memory·Tagging·Extension·and·Top·Byte·Ignore
> +» ··support·by·the·CPU·and·therefore·is·only·supported·for·modern·arm64
> +» ··CPUs·(MTE·added·in·ARMv8.5·ISA).
> +

I do not thing we should make KASAN_HW_TAGS MTE specific especially because it
is in the common code (e.g. SPARC ADI might want to implement it in future).

Probably would be better to provide some indirection in the generic code an
implement the MTE backend entirely in arch code.

Thoughts?

-- 
Regards,
Vincenzo

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```