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

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Message-Id: <1152887287.24925.22.camel@localhost.localdomain>
Date:	Fri, 14 Jul 2006 07:28:06 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.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

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?

> 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?

-- Dave

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