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

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Message-ID: <alpine.DEB.2.20.1512221124230.14335@east.gentwo.org>
Date:	Tue, 22 Dec 2015 11:24:50 -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:

> 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.

View attachment "slub-poison-zeros.patch" of type "text/x-patch" (1547 bytes)