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

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Message-ID: <m17j2gw76o.fsf@ebiederm.dsl.xmission.com>
Date:	Fri, 14 Jul 2006 09:13:35 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	"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

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.

>> Passing a file descriptor between process in a unix domain socket is
>> a case where I can easily construct scenarios where there are
>> indisputable problems.  It is one of my standard thought experiments
>> to see if a namespace is sound.
>
> Care to share some of those indisputable problems?

Already done.

Eric
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