linux-kernel - Re: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure.

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Message-id: <53BE4141.6060908@samsung.com>
Date:	Thu, 10 Jul 2014 11:31:13 +0400
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Alexey Preobrazhensky <preobr@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Michal Marek <mmarek@...e.cz>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org, linux-mm@...ck.org
Subject: Re: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer
 infrastructure.

On 07/09/14 18:26, Christoph Lameter wrote:
> On Wed, 9 Jul 2014, Andrey Ryabinin wrote:
> 
>> +
>> +Markers of unaccessible bytes could be found in mm/kasan/kasan.h header:
>> +
>> +#define KASAN_FREE_PAGE         0xFF  /* page was freed */
>> +#define KASAN_PAGE_REDZONE      0xFE  /* redzone for kmalloc_large allocations */
>> +#define KASAN_SLAB_REDZONE      0xFD  /* Slab page redzone, does not belong to any slub object */
> 
> We call these zones "PADDING". Redzones are associated with an object.
> Padding is there because bytes are left over, unusable or necessary for
> alignment.
> 
Goop point. I will change the name to make it less confusing.
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