linux-kernel - Re: [PATCH v2 5/5] arm64: add KASan support

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Message-ID: <CACRpkdZsVqCy4pqVyu0_5+6m8dKdoa=60DU8fo59WZ6ZyQXRPA@mail.gmail.com>
Date:	Tue, 26 May 2015 22:28:00 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	David Keitel <dkeitel@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-mm@...ck.org
Subject: Re: [PATCH v2 5/5] arm64: add KASan support

On Tue, May 26, 2015 at 4:22 PM, Andrey Ryabinin <a.ryabinin@...sung.com> wrote:
> On 05/26/2015 05:12 PM, Andrey Ryabinin wrote:
>> On 05/26/2015 04:35 PM, Linus Walleij wrote:
>>> I wonder were the problem lies, any hints where to start looking
>>> to fix this?
>>>
>>
>> I suspect that your compiler lack -fsantize=kernel-address support.
>> It seems that GCC 4.9.2 doesn't supports -fsanitize=address/kernel-address on aarch64.
>>
>
> In that case you should get something like this, during kernel build:
>         scripts/Makefile.kasan:17: Cannot use CONFIG_KASAN: -fsanitize=kernel-address is not supported by compiler

Aha yep that's it when I look closer...

I'm going back and rebuilding my compiler. May as well do a trunk
5.0 build and try to get KASAN_INLINE working while I'm at it.

Yours,
Linus Walleij
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