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From: Christopher Lameter <cl@linux.com>
To: Kees Cook <keescook@chromium.org>
Cc: David Laight <David.Laight@ACULAB.COM>,
	Andrew Morton <akpm@linux-foundation.org>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Daniel Micay <danielmicay@gmail.com>,
	Vitaly Nikolenko <vnik@duasynt.com>,
	Silvio Cesare <silvio.cesare@gmail.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] slub: Relocate freelist pointer to middle of object
Date: Sun, 15 Mar 2020 14:11:38 +0000 (UTC)	[thread overview]
Message-ID: <alpine.DEB.2.21.2003151410220.14449@www.lameter.com> (raw)
In-Reply-To: <202003111039.24B8A0B@keescook>

On Wed, 11 Mar 2020, Kees Cook wrote:

> > Sounds good. You could even randomize the position to avoid attacks on via
> > the freelist pointer.
>
> That's a good point. "offset" is just calculated once, and for many
> slabs, the available space is quite large. I wonder what the best

Correct.

> practice might be for how far from the edge to stay. Hmmm. Maybe simply
> carve it into thirds, and randomize the offset within the middle third?

Take off the first and last word and randomize within the space that is
left?

      reply	other threads:[~2020-03-15 14:11 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06  0:26 Kees Cook
2020-03-08 19:21 ` Christopher Lameter
2020-03-11 14:48   ` David Laight
2020-03-11 17:37     ` Kees Cook
2020-03-11 17:44     ` Kees Cook
2020-03-15 14:11       ` Christopher Lameter [this message]

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