linux-kernel - Re: [RFC/PATCH v2 01/10] Add kernel address sanitizer infrastructure.

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Message-ID: <54111D3B.6060609@oracle.com>
Date:	Wed, 10 Sep 2014 23:55:39 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	linux-kernel@...r.kernel.org
CC:	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-mm@...ck.org, Randy Dunlap <rdunlap@...radead.org>,
	Michal Marek <mmarek@...e.cz>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC/PATCH v2 01/10] Add kernel address sanitizer infrastructure.

On 09/10/2014 10:31 AM, Andrey Ryabinin wrote:
> +ifdef CONFIG_KASAN
> +  ifeq ($(call cc-option, $(CFLAGS_KASAN)),)
> +    $(warning Cannot use CONFIG_KASAN: \
> +	      -fsanitize=kernel-address not supported by compiler)
> +  endif
> +endif

This seems to always indicate that my gcc doesn't support
-fsanitize=kernel-address:

Makefile:769: Cannot use CONFIG_KASAN: -fsanitize=kernel-address not supported by compiler

Even though:

$ gcc --version
gcc (GCC) 5.0.0 20140904 (experimental)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cat test.c
#include <stdio.h>
#include <sys/mman.h>

void __asan_init_v3(void) { }

int main(int argc, char *argv[])
{
        return 0;
}
$ gcc -fsanitize=kernel-address test.c
$ ./a.out
$


Thanks,
Sasha
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