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Re: [libvirt] [PATCH] lxc: stop rootless containers from messing with system mounts



On Tue, Apr 07, 2009 at 10:14:23AM +0100, Daniel P. Berrange wrote:
> On Mon, Apr 06, 2009 at 01:47:42PM -0500, Serge E. Hallyn wrote:
> > If a container has no root, liblxc remounts /proc.  If the
> > system had marked / as MS_SHARED, then even though the
> > container is in a new mounts namespace, the mount event is
> > propagated back to the host mounts namespace, overwriting
> > /proc.  After that, for instance, ps will no longer show
> > system processes.
> > 
> > A Fedora 11 default install has / MS_SHARED.
> > 
> > Make sure that root is not MS_SHARED before remounting
> > /proc.  I'm making it MS_SLAVE so that the container
> > will receive mount events from the host, but not vice
> > versa.
> > 
> > Signed-off-by: Serge Hallyn <serue us ibm com>
> 
> Doh, that's rather annoying. ACK to this patch. 


Was just about to commit this, but seems Dan Smith beat me to it. The
following pivot_root patch is committed too


Daniel
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