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

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Message-ID: <1289211258.2820.176.camel@edumazet-laptop>
Date:	Mon, 08 Nov 2010 11:14:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	David Miller <davem@...emloft.net>, drosenberg@...curity.com,
	chas3@...rs.sourceforge.net, tytso@....edu,
	torvalds@...ux-foundation.org, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, remi.denis-courmont@...ia.com,
	netdev@...r.kernel.org, security@...nel.org
Subject: Re: [Security] [SECURITY] Fix leaking of kernel heap addresses via
 /proc

Le lundi 08 novembre 2010 à 10:43 +0100, Andi Kleen a écrit :
> > When a printk() happens right before a BUG(), how are we going to check
> > the dumped registers are possibly close the socket involved, if we dont
> > have access to the machine, and only the crashlog ?
> 
> Is that really something you do regularly? It seems highly obscure
> to me.

Yes, very regularly, I can find bugs thanks to every bit of information
found in kernel logs, including code around the fault.

If people now say : "I have a kernel bug, but am not able to provide you
a kernel stack trace and previous printk() messages because of security.
You cannot have an access to this machine, and the bug happens once in a
while. Kernel version is also hidden. Please help me."

Oh well, thats a challenge, maybe use this cristal ball I have somewhere
in the attic ;)



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