netdev - Re: [Security] [SECURITY] Fix leaking of kernel heap addresses via /proc

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Date:	Sun, 07 Nov 2010 17:48:45 -0500
From:	"Chas Williams (CONTRACTOR)" <chas@....nrl.navy.mil>
To:	Andi Kleen <andi@...stfloor.org>
cc:	"Ted Ts'o" <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dan Rosenberg <drosenberg@...curity.com>,
	"davem\@davemloft.net" <davem@...emloft.net>,
	"kuznet\@ms2.inr.ac.ru" <kuznet@....inr.ac.ru>,
	"pekkas\@netcore.fi" <pekkas@...core.fi>,
	"jmorris\@namei.org" <jmorris@...ei.org>,
	"yoshfuji\@linux-ipv6.org" <yoshfuji@...ux-ipv6.org>,
	"kaber\@trash.net" <kaber@...sh.net>,
	"remi.denis-courmont\@nokia.com" <remi.denis-courmont@...ia.com>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
	"security\@kernel.org" <security@...nel.org>
Subject: Re: [Security] [SECURITY] Fix leaking of kernel heap addresses via /proc

In message <87sjzcssx5.fsf@...il.nowhere.org>,Andi Kleen writes:
>Ted Ts'o <tytso@....edu> writes:
>
>> Are there any userspace programs that might be reasonably expected to
>> _use_ this information?  If there is, we could just pick a random
>> number at boot time, and then XOR the heap adddress with that random
>> number.
>
>If any of the addresses can be guessed ever (and that is likely if it's
>allocated at boot) determining the random value will be trivial
>for everyone.

i suppose one could use idr to map the pointers to unique values.  the
infiniband code uses this technique>
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