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

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Message-ID: <alpine.DEB.2.20.1512221207230.14406@east.gentwo.org>
Date:	Tue, 22 Dec 2015 12:08:17 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Dave Hansen <dave.hansen@...el.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 Tue, 22 Dec 2015, Dave Hansen wrote:

> > 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.

Well much of the code is expecting a zeroed object from the allocator and
its zeroed at that time. Zeroing makes the object cache hot which is an
important performance aspect.

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