netdev - Re: [patch 1/1] net: convert %p usage to %pK

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Message-ID: <1306465841.2543.52.camel@edumazet-laptop>
Date:	Fri, 27 May 2011 05:10:41 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	kees.cook@...onical.com, joe@...ches.com, mingo@...e.hu,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	drosenberg@...curity.com, a.p.zijlstra@...llo.nl,
	eparis@...isplace.org, eugeneteo@...nel.org, jmorris@...ei.org,
	tgraf@...radead.org
Subject: Re: [patch 1/1] net: convert %p usage to %pK

Le jeudi 26 mai 2011 à 22:44 -0400, David Miller a écrit :
> From: Kees Cook <kees.cook@...onical.com>
> Date: Thu, 26 May 2011 17:14:49 -0700
> > 
> > We got this dropped from the /proc view; why can't we do the same for
> > this netlink interface?
> 
> Because it's not only an opaque "output" blob, it's also an input key
> for lookups which the user can trigger.

Yes, we wan add a layer to obfuscate the real pointers. We dont trust
values given by user, only match them.

Either we use a XOR with a boot time random value (but let the NULL
cookie being the NULL one), or we generate an unique 64bit socket id for
the cookie (and keep a 64bit cookie in all sockets, increasing ram
usage)



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