linux-kernel - Re: [PATCH] devpts: Add ptmx_uid and ptmx

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Date:	Tue, 31 Mar 2015 09:57:22 +0200
From:	Alexander Larsson <alexl@...hat.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Andy Lutomirski <luto@...capital.net>, gnome-os-list@...me.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mclasen@...hat.com, "Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] devpts: Add ptmx_uid and ptmx_gid options

On fre, 2015-03-27 at 10:03 +0100, James Bottomley 
> 
> > On Fri, Feb 20, 2015 at 5:04 PM, Andy Lutomirski <luto@...capital.net> wrote:
> > > It's currently impossible to mount devpts in a user namespace that
> > > has no root user, since ptmx can't be created.
> 
> This is where I stopped reading because it's not true ... because it is
> possible, you just do it from the host as real root.

The point is being able to set up a container as a user, not requiring
the setup to be run as root at all. In my case container is a desktop
application which will be started by the user, and will run as the user.
There is no root involved in the call chain at all.

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 Alexander Larsson                                            Red Hat, Inc 
       alexl@...hat.com            alexander.larsson@...il.com 
He's a war-weary Catholic boxer for the 21st century. She's a beautiful 
renegade magician's assistant looking for love in all the wrong places. 
They fight crime! 

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