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

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Message-ID: <AANLkTimC01SViEOObgf2N2VcLTYO59rOAbHaKf2RM54w@mail.gmail.com>
Date:	Sat, 6 Nov 2010 13:50:32 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	"chas@....nrl.navy.mil" <chas@....nrl.navy.mil>,
	"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

On Saturday, November 6, 2010, Dan Rosenberg <drosenberg@...curity.com> wrote:
>
> Clearly, in most cases we cannot just remove the field from the /proc
> output, as this would break a number of userspace programs that rely on
> consistency.  However, I propose that we replace the address with a "0"
> rather than leaking this information.

I really think it would be much better to use the unidentified number
or similar.

Just replacing with zeroes is annoying, and has the potential of
losing actual information.

     Linus
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