linux-kernel - Re: [PATCH -mm 5/7] add user namespace

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Message-ID: <20060714162935.GA25303@sergelap.austin.ibm.com>
Date:	Fri, 14 Jul 2006 11:29:35 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Dave Hansen <haveblue@...ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Kirill Korotaev <dev@...nvz.org>, Andrey Savochkin <saw@...ru>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Sam Vilain <sam.vilain@...alyst.net.nz>
Subject: Re: [PATCH -mm 5/7] add user namespace

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> Dave Hansen <haveblue@...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
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