linux-kernel - Re: [PATCH v4 1/7] x86/kasan: generate KASAN_SHADOW

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Message-ID: <20150727164034.GC350@e104818-lin.cambridge.arm.com>
Date:	Mon, 27 Jul 2015 17:40:35 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
Cc:	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Alexey Klimov <klimov.linux@...il.com>,
	Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org,
	Linus Walleij <linus.walleij@...aro.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	David Keitel <dkeitel@...eaurora.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Potapenko <glider@...gle.com>,
	Michal Marek <mmarek@...e.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v4 1/7] x86/kasan: generate KASAN_SHADOW_OFFSET in
 Makefile

On Fri, Jul 24, 2015 at 07:41:53PM +0300, Andrey Ryabinin wrote:
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index b3a1a5d..6d6dd6f 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -255,11 +255,6 @@ config ARCH_SUPPORTS_OPTIMIZED_INLINING
>  config ARCH_SUPPORTS_DEBUG_PAGEALLOC
>  	def_bool y
>  
> -config KASAN_SHADOW_OFFSET
> -	hex
> -	depends on KASAN
> -	default 0xdffffc0000000000
> -
>  config HAVE_INTEL_TXT
>  	def_bool y
>  	depends on INTEL_IOMMU && ACPI
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index 118e6de..c666989 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -39,6 +39,8 @@ ifdef CONFIG_X86_NEED_RELOCS
>          LDFLAGS_vmlinux := --emit-relocs
>  endif
>  
> +KASAN_SHADOW_OFFSET := 0xdffffc0000000000

To keep things simple for x86, can you not just define:

KASAN_SHADOW_OFFSET := $(CONFIG_KASAN_SHADOW_OFFSET)

or, even better, in scripts/Makefile.kasan:

KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)

and set it under arch/arm64/Makefile only.

-- 
Catalin
--
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