Date: Wed, 9 Jul 2014 09:26:03 -0500 (CDT)
From: Christoph Lameter <cl@gentwo.org>
To: Andrey Ryabinin <a.ryabinin@samsung.com>
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>,
        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 01/21] Add kernel address sanitizer
 infrastructure.
In-Reply-To: <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com>
Message-ID: <alpine.DEB.2.11.1407090924030.1384@gentwo.org>
References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com>
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Sender: linux-kernel-owner@vger.kernel.org

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.
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