From: Pekka Enberg <penberg@kernel.org>
To: Dan Rosenberg <drosenberg@vsecurity.com>
Cc: Matt Mackall <mpm@selenic.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Theodore Tso <tytso@mit.edu>,
cl@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] Make /proc/slabinfo 0400
Date: Sat, 5 Mar 2011 00:14:57 +0200 [thread overview]
Message-ID: <AANLkTikQxOgYFLbc2KbEKgRYL1RCnkPE-T80-GBY2Cgj@mail.gmail.com> (raw)
In-Reply-To: <AANLkTikA=88EMs8RRm0RPQ+Q9nKj=2G+G86h5nCnV7Se@mail.gmail.com>
On Sat, Mar 5, 2011 at 12:10 AM, Pekka Enberg <penberg@kernel.org> wrote:
> I can think of four things that will make things harder for the
> attacker (in the order of least theoretical performance impact):
>
> (1) disable slub merging
>
> (2) pin down random objects in the slab during setup (i.e. don't
> allow them to be allocated)
>
> (3) randomize the initial freelist
>
> (4) randomize padding between objects in a slab
>
> AFAICT, all of them will make brute force attacks using the kernel
> heap as an attack vector harder but won't prevent them.
There's also a fifth one:
(5) randomize slab page allocation order
which will make it harder to make sure you have full control over a
slab and figure out which allocation lands on it.
Pekka
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next prev parent reply other threads:[~2011-03-04 22:14 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-03 17:50 Dan Rosenberg
2011-03-03 18:17 ` Dave Hansen
2011-03-03 18:29 ` Dan Rosenberg
2011-03-03 20:58 ` Matt Mackall
2011-03-03 21:16 ` Dan Rosenberg
2011-03-03 21:44 ` Matt Mackall
2011-03-03 22:30 ` Dan Rosenberg
2011-03-03 23:08 ` Matt Mackall
2011-03-04 0:32 ` Dave Hansen
2011-03-04 0:50 ` Theodore Tso
2011-03-04 6:52 ` Pekka Enberg
2011-03-04 17:36 ` Dave Hansen
2011-03-04 17:48 ` Linus Torvalds
2011-03-04 18:14 ` Matt Mackall
2011-03-04 20:02 ` Pekka Enberg
2011-03-04 20:31 ` Matt Mackall
2011-03-04 20:42 ` Dan Rosenberg
2011-03-04 20:56 ` Pekka Enberg
2011-03-04 21:08 ` Dan Rosenberg
2011-03-04 21:30 ` Pekka Enberg
2011-03-04 21:44 ` Dan Rosenberg
2011-03-04 22:10 ` Pekka Enberg
2011-03-04 22:14 ` Pekka Enberg [this message]
2011-03-04 23:02 ` Matt Mackall
2011-03-05 16:25 ` Ted Ts'o
2011-03-06 13:19 ` Alan Cox
2011-03-07 14:56 ` Dan Rosenberg
2011-03-07 16:02 ` Matt Mackall
2011-03-04 20:37 ` Dan Rosenberg
2011-03-04 20:58 ` Pekka Enberg
2011-03-04 21:10 ` Dan Rosenberg
2011-03-06 0:42 ` Jesper Juhl
2011-03-06 0:57 ` Dan Rosenberg
2011-03-06 1:09 ` Matt Mackall
2011-03-06 1:15 ` Jesper Juhl
2011-03-07 16:40 ` Christoph Lameter
2011-03-04 21:12 ` Matt Mackall
2011-03-04 11:58 ` Alan Cox
2011-03-07 14:19 [PATCH] Make /proc/slabinfo 040 George Spelvin
2011-03-07 17:49 ` [PATCH] Make /proc/slabinfo 0400 George Spelvin
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