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

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Message-id: <55648193.3030003@samsung.com>
Date:	Tue, 26 May 2015 17:22:11 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Linus Walleij <linus.walleij@...aro.org>
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 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


Also you may check you gcc by compiling simple program:
$ cat test.c
void main(void) {
}

$ gcc -fsanitize=kernel-address test.c


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