linux-kernel - Re: [PATCH v6 0/6] KASAN for arm64

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

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@...il.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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