linux-kernel - Re: [kernel-hardening] [RFC][PATCH 6/7] mm: Add Kconfig option for slab sanitization

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Date:	Tue, 22 Dec 2015 09:28:49 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	kernel-hardening@...ts.openwall.com,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Laura Abbott <laura@...bott.name>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [kernel-hardening] [RFC][PATCH 6/7] mm: Add Kconfig option for
 slab sanitization

On 12/22/2015 09:24 AM, Christoph Lameter wrote:
> On Tue, 22 Dec 2015, Dave Hansen wrote:
>> Or are you just saying that we should use the poisoning *code* that we
>> already have in slub?  Using the _code_ looks like a really good idea,
>> whether we're using it to write POISON_FREE, or 0's.  Something like the
>> attached patch?
> 
> Why would you use zeros? The point is just to clear the information right?
> The regular poisoning does that.

It then allows you to avoid the zeroing at allocation time.
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