Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86

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To: "Christoph Lameter (Ampere)" <cl@xxxxxxxxxx>
Subject: Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86
From: Ard Biesheuvel <ardb@xxxxxxxxxx>
Date: Thu, 6 Feb 2025 00:04:17 +0100
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>, Maciej Wieczor-Retman <maciej.wieczor-retman@xxxxxxxxx>, luto@xxxxxxxxxx, xin@xxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, palmer@xxxxxxxxxxx, tj@xxxxxxxxxx, andreyknvl@xxxxxxxxx, brgerst@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, jgross@xxxxxxxx, will@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, arnd@xxxxxxxx, corbet@xxxxxxx, dvyukov@xxxxxxxxxx, richard.weiyang@xxxxxxxxx, ytcoode@xxxxxxxxx, tglx@xxxxxxxxxxxxx, hpa@xxxxxxxxx, seanjc@xxxxxxxxxx, paul.walmsley@xxxxxxxxxx, aou@xxxxxxxxxxxxxxxxx, justinstitt@xxxxxxxxxx, jason.andryuk@xxxxxxx, glider@xxxxxxxxxx, ubizjak@xxxxxxxxx, jannh@xxxxxxxxxx, bhe@xxxxxxxxxx, vincenzo.frascino@xxxxxxx, rafael.j.wysocki@xxxxxxxxx, ndesaulniers@xxxxxxxxxx, mingo@xxxxxxxxxx, catalin.marinas@xxxxxxx, junichi.nomura@xxxxxxx, nathan@xxxxxxxxxx, ryabinin.a.a@xxxxxxxxx, dennis@xxxxxxxxxx, bp@xxxxxxxxx, kevinloughlin@xxxxxxxxxx, morbo@xxxxxxxxxx, dan.j.williams@xxxxxxxxx, julian.stecklina@xxxxxxxxxxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, kees@xxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, llvm@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx
In-reply-to: <3dcf7631-d839-7235-10c7-30f80d7f796a@gentwo.org>
References: <cover.1738686764.git.maciej.wieczor-retman@intel.com> <8bd9c793-aac6-a330-ea8f-3bde0230a20b@gentwo.org> <fb30574a-d238-424c-a464-0f7a5707c46a@intel.com> <3dcf7631-d839-7235-10c7-30f80d7f796a@gentwo.org>

On Wed, 5 Feb 2025 at 20:31, Christoph Lameter (Ampere) <cl@xxxxxxxxxx> wrote:
>
> MTE tagging is part of the processor standard for ARM64 and Linux will
> need to support the 16 byte tagging feature one way or another even if
> Intel does not like it. And AFAICT hardware tagging support is a critical
> security feature for the future.
>

Can you explain what you feel is lacking in the existing MTE support
in KAsan (enabled when selecting CONFIG_KASAN_HW_TAGS)?

References:
- [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86
  - From: Maciej Wieczor-Retman
- Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86
  - From: Christoph Lameter (Ampere)
- Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86
  - From: Dave Hansen
- Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86
  - From: Christoph Lameter (Ampere)

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