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Date: Fri, 26 Sep 2014 13:01:08 -0400
From: Sasha Levin <sasha.levin@oracle.com>
MIME-Version: 1.0
Subject: Re: [PATCH v3 00/13] Kernel address sanitizer - runtime memory debugger.
References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1411562649-28231-1-git-send-email-a.ryabinin@samsung.com>
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To: Andrey Ryabinin <a.ryabinin@samsung.com>, linux-kernel@vger.kernel.org
Cc: Dmitry Vyukov <dvyukov@google.com>, Konstantin Serebryany <kcc@google.com>, Dmitry Chernenkov <dmitryc@google.com>, Andrey Konovalov <adech.fo@gmail.com>, Yuri Gribov <tetra2005@gmail.com>, Konstantin Khlebnikov <koct9i@gmail.com>, Michal Marek <mmarek@suse.cz>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrew Morton <akpm@linux-foundation.org>, Dave Hansen <dave.hansen@intel.com>, Andi Kleen <andi@firstfloor.org>, Vegard Nossum <vegard.nossum@gmail.com>, "H. Peter Anvin" <hpa@zytor.com>, linux-kbuild@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Randy Dunlap <rdunlap@infradead.org>, Peter Zijlstra <peterz@infradead.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Dave Jones <davej@redhat.com>

On 09/24/2014 08:43 AM, Andrey Ryabinin wrote:
> Hi.
> 
> This is a third iteration of kerenel address sanitizer (KASan).
> 
> KASan is a runtime memory debugger designed to find use-after-free
> and out-of-bounds bugs.
> 
> Currently KASAN supported only for x86_64 architecture and requires kernel
> to be build with SLUB allocator.
> KASAN uses compile-time instrumentation for checking every memory access, therefore you
> will need a fresh GCC >= v5.0.0.

Hi Andrey,

I tried this patchset, with the latest gcc, and I'm seeing the following:

arch/x86/kernel/head.o: In function `_GLOBAL__sub_I_00099_0_reserve_ebda_region':
/home/sasha/linux-next/arch/x86/kernel/head.c:71: undefined reference to `__asan_init_v4'
init/built-in.o: In function `_GLOBAL__sub_I_00099_0___ksymtab_system_state':
/home/sasha/linux-next/init/main.c:1034: undefined reference to `__asan_init_v4'
init/built-in.o: In function `_GLOBAL__sub_I_00099_0_init_uts_ns':
/home/sasha/linux-next/init/version.c:50: undefined reference to `__asan_init_v4'
init/built-in.o: In function `_GLOBAL__sub_I_00099_0_root_mountflags':
/home/sasha/linux-next/init/do_mounts.c:638: undefined reference to `__asan_init_v4'
init/built-in.o: In function `_GLOBAL__sub_I_00099_0_rd_prompt':
/home/sasha/linux-next/init/do_mounts_rd.c:361: undefined reference to `__asan_init_v4'
init/built-in.o:/home/sasha/linux-next/init/do_mounts_md.c:312: more undefined references to `__asan_init_v4' follow


What am I missing?


Thanks,
Sasha

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