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Date: Thu, 29 Sep 2011 21:25:31 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: kernel-hardening@...ts.openwall.com, Valdis.Kletnieks@...edu
Cc: David Rientjes <rientjes@...gle.com>, Christoph Lameter <cl@...two.org>,
Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
Kees Cook <kees@...ntu.com>, Dave Hansen <dave@...ux.vnet.ibm.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH 2/2] mm: restrict access to
/proc/meminfo
On Thu, Sep 29, 2011 at 12:57 -0400, Valdis.Kletnieks@...edu wrote:
> But now he has to fly blind for the next 30 because the numbers will display
> exactly the same, and he can't correct for somebody else allocating one so he
> needs to only allocate 29...
You're still talking about "slabinfo", which is already restricted.
And meminfo can be still learned with the same race window (ala seq lock):
prepare_stuff();
fill_slabs(); // Here we know counters with KB granularity
while (number_is_not_ok()) {
prepare_stuff();
fill_slabs();
}
do_exploit();
Thanks,
--
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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