Message-id: <53BE9B25.6090906@samsung.com>
Date: Thu, 10 Jul 2014 17:54:45 +0400
From: Andrey Ryabinin <a.ryabinin@samsung.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101
 Thunderbird/24.6.0
MIME-version: 1.0
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
        Konstantin Serebryany <kcc@google.com>,
        Alexey Preobrazhensky <preobr@google.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Yuri Gribov <tetra2005@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>, Michal Marek <mmarek@suse.cz>,
        Russell King <linux@arm.linux.org.uk>,
        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>,
        linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        x86@kernel.org, linux-mm@kvack.org
Subject: Re: [RFC/PATCH RESEND -next 03/21] x86: add kasan hooks fort
 memcpy/memmove/memset functions
References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com>
 <1404905415-9046-4-git-send-email-a.ryabinin@samsung.com>
 <87ion6nxap.fsf@tassilo.jf.intel.com>
In-reply-to: <87ion6nxap.fsf@tassilo.jf.intel.com>
Content-type: text/plain; charset=UTF-8
Content-transfer-encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org

On 07/09/14 23:31, Andi Kleen wrote:
> Andrey Ryabinin <a.ryabinin@samsung.com> writes:
>> +
>> +#undef memcpy
>> +void *kasan_memset(void *ptr, int val, size_t len);
>> +void *kasan_memcpy(void *dst, const void *src, size_t len);
>> +void *kasan_memmove(void *dst, const void *src, size_t len);
>> +
>> +#define memcpy(dst, src, len) kasan_memcpy((dst), (src), (len))
>> +#define memset(ptr, val, len) kasan_memset((ptr), (val), (len))
>> +#define memmove(dst, src, len) kasan_memmove((dst), (src), (len))
> 
> I don't think just define is enough, gcc can call these functions
> implicitely too (both with and without __). For example for a struct copy.
> 
> You need to have true linker level aliases. 
> 

It's true, but problem with linker aliases that they cannot be disabled for some files
we don't want to instrument.

> -Andi
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/