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Date: Fri, 14 Jul 2006 11:29:35 -0500
From: "Serge E. Hallyn" <serue@us.ibm.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Dave Hansen <haveblue@us.ibm.com>, "Serge E. Hallyn" <serue@us.ibm.com>,
       Cedric Le Goater <clg@fr.ibm.com>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@osdl.org>, Kirill Korotaev <dev@openvz.org>,
       Andrey Savochkin <saw@sw.ru>, Herbert Poetzl <herbert@13thfloor.at>,
       Sam Vilain <sam.vilain@catalyst.net.nz>
Subject: Re: [PATCH -mm 5/7] add user namespace
Message-ID: <20060714162935.GA25303@sergelap.austin.ibm.com>
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Quoting Eric W. Biederman (ebiederm@xmission.com):
> Dave Hansen <haveblue@us.ibm.com> writes:
> 
> > On Thu, 2006-07-13 at 21:45 -0600, Eric W. Biederman wrote:
> >> I think for filesystems like /proc and /sys that there will normally
> >> be problems.  However many of those problems can be rationalized away
> >> as a reasonable optimization, or are not immediately apparent.
> >
> > Could you talk about some of these problems?
> 
> Already mentioned but.  rw permissions on sensitive files are for 
> uid == 0.  No capability checks are performed.

As Herbert (IIRC) pointed out that could/should be fixed.

-serge