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

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Message-ID: <20101107235610.GE17592@basil.fritz.box>
Date:	Mon, 8 Nov 2010 00:56:10 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	chas3@...rs.sourceforge.net, Andi Kleen <andi@...stfloor.org>,
	Ted Ts'o <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"kuznet@....inr.ac.ru" <kuznet@....inr.ac.ru>,
	"pekkas@...core.fi" <pekkas@...core.fi>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"yoshfuji@...ux-ipv6.org" <yoshfuji@...ux-ipv6.org>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"remi.denis-courmont@...ia.com" <remi.denis-courmont@...ia.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"security@...nel.org" <security@...nel.org>
Subject: Re: [Security] [SECURITY] Fix leaking of kernel heap addresses via
 /proc

> The criticism raised so far is that cutting out the pointers entirely
> results in the omission of potentially useful debugging information.  I
> see two viable options to address this: either print out or omit
> addresses based on privileges (CAP_NET_ADMIN, for example), or have it
> controllable via sysctl.  I'm leaning towards the sysctl
> option...thoughts?

I would just remove the pointers from /proc and supply 
gdb macros that extract the equivalent information from /proc/kcore.
This is a bit racy, but for debugging it should be no
problem to run them multiple times as needed.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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