linux-kernel - Re: [PATCH v9 24/44] kasan, arm64: don't allow SW_TAGS with ARM64

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Date:   Wed, 11 Nov 2020 16:52:59 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 24/44] kasan, arm64: don't allow SW_TAGS with ARM64_MTE

On Tue, Nov 10, 2020 at 11:12 PM 'Andrey Konovalov' via kasan-dev
<kasan-dev@...glegroups.com> wrote:
>
> Software tag-based KASAN provides its own tag checking machinery that
> can conflict with MTE. Don't allow enabling software tag-based KASAN
> when MTE is enabled.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>

> ---
> Change-Id: Icd29bd0c6b1d3d7a0ee3d50c20490f404d34fc97
> ---
>  arch/arm64/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 1515f6f153a0..25ead11074bf 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -134,7 +134,7 @@ config ARM64
>         select HAVE_ARCH_JUMP_LABEL
>         select HAVE_ARCH_JUMP_LABEL_RELATIVE
>         select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
> -       select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
> +       select HAVE_ARCH_KASAN_SW_TAGS if (HAVE_ARCH_KASAN && !ARM64_MTE)
>         select HAVE_ARCH_KGDB
>         select HAVE_ARCH_MMAP_RND_BITS
>         select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
> --
> 2.29.2.222.g5d2a92d10f8-goog
>
> --
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-- 
Alexander Potapenko
Software Engineer

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