linux-kernel - Re: [PATCH v3 21/39] kasan: don't allow SW_TAGS with ARM64

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Date:   Thu, 1 Oct 2020 19:55:39 +0200
From:   elver@...gle.com
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev@...glegroups.com,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 21/39] kasan: don't allow SW_TAGS with ARM64_MTE

Does that patch title need an ", arm64" in it, like the others?

On Fri, Sep 25, 2020 at 12:50AM +0200, Andrey Konovalov 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>
> ---
> 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 e7450fbd0aa7..e875db8e1c86 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -131,7 +131,7 @@ 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
> -- 
> 2.28.0.681.g6f77f65b4e-goog
>