Re: [patch 0/8] unprivileged mount syscall

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> 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

Thinking a bit more about this, I'm quite sure most users wouldn't
even want private namespaces.  It would be enough to

  chroot /share/$USER

and be done with it.

Private namespaces are only good for keeping a bunch of mounts
referenced by a group of processes.  But my guess is, that the natural
behavior for users is to see a persistent set of mounts.

If for example they mount something on a remote machine, then log out
from the ssh session and later log back in, they would want to see
their previous mount still there.

Miklos
-
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux