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Message-ID: <20110929172531.GA19290@albatros> 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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