linux-kernel - Re: [patch 0/8] unprivileged mount syscall

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Message-Id: <1176316116.2811.39.camel@ram.us.ibm.com>
Date:	Wed, 11 Apr 2007 11:28:36 -0700
From:	Ram Pai <linuxram@...ibm.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	serue@...ibm.com, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, containers@...ts.osdl.org,
	util-linux-ng@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/8] unprivileged mount syscall

On Wed, 2007-04-11 at 12:44 +0200, Miklos Szeredi wrote:
> > 1. clone the master namespace.
> > 
> > 2. in the new namespace
> > 
> > 	move the tree under /share/$me to /
> >         for each ($user, $what, $how) {
> >             move /share/$user/$what to /$what
> > 	    if ($how == slave) {
> >                  make the mount tree under /$what as slave
> >             }
> >         }
> >         
> > 3. in the new namespace make the tree under 
> >        /share as private and unmount /share
> 
> Thanks.  I get the basic idea now: the namespace itself need not be
> shared between the sessions, it is enough if "share" propagation is
> set up between the different namespaces of a user.
> 
> I don't yet see either in your or Viro's description how the trees
> under /share/$USER are initialized.  I guess they are recursively
> bound from /, and are made slaves.

yes. I suppose, when a userid is created one of the steps would be

mount --rbind / /share/$USER
mount --make-rslave /share/$USER
mount --make-rshared /share/$USER

RP







> Miklos

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