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Message-Id: <201011072248.oA7MmjKg025857@cmf.nrl.navy.mil> 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> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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