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Date: Fri, 9 Oct 2015 10:48:51 +0100
From: Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH v6 0/6] KASAN for arm64
Message-ID: <20151009094851.GA20507@leverpostej>
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To: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, "linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>, Arnd Bergmann <arnd@arndb.de>, Yury <yury.norov@gmail.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Linus Walleij <linus.walleij@linaro.org>, Mark Salter <msalter@redhat.com>, Will Deacon <will.deacon@arm.com>, LKML <linux-kernel@vger.kernel.org>, Alexey Klimov <klimov.linux@gmail.com>, Alexander Potapenko <glider@google.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Konovalov <andreyknvl@google.com>, David Keitel <dkeitel@codeaurora.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Matt Fleming <matt.fleming@intel.com>

On Fri, Oct 09, 2015 at 12:32:18PM +0300, Andrey Ryabinin wrote:
[...]

> I thought the EFI stub isolation patches create a copy of mem*() functions in the stub,
> but they are just create aliases with __efistub_ prefix.
> 
> We only need to create some more aliases for KASAN.
> The following patch on top of the EFI stub isolation series works for me.
> 
> 
> Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
> ---
>  arch/arm64/kernel/image.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h
> index e083af0..6eb8fee 100644
> --- a/arch/arm64/kernel/image.h
> +++ b/arch/arm64/kernel/image.h
> @@ -80,6 +80,12 @@ __efistub_strcmp		= __pi_strcmp;
>  __efistub_strncmp		= __pi_strncmp;
>  __efistub___flush_dcache_area	= __pi___flush_dcache_area;
>  
> +#ifdef CONFIG_KASAN
> +__efistub___memcpy		= __pi_memcpy;
> +__efistub___memmove		= __pi_memmove;
> +__efistub___memset		= __pi_memset;
> +#endif

Ard's v4 stub isolation series has these aliases [1], as the stub
requires these aliases regardless of KASAN in order to link.

Thanks,
Mark.

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/375708.html

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