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Re: [Libguestfs] [PATCH 4/7] launch: libvirt: Allow the SELinux label to be set on qcow2 overlay files.



On Thu, Feb 28, 2013 at 02:31:23PM +0000, Richard W.M. Jones wrote:
> On Thu, Feb 28, 2013 at 02:24:30PM +0000, Richard W.M. Jones wrote:
> > On Thu, Feb 28, 2013 at 02:14:42PM +0000, Matthew Booth wrote:
> > > Relabelling the appliance could get complicated wrt multiple
> > > appliances running simultaneously.
> > 
> > Right -- I suspect this is buggy actually, but it's quite hard to test
> > it since I need to run up lots of guests and run virt-df in parallel
> > on them.  Also we put <shareable/> on the appliance disk, and I'm not
> > sure what libvirt does in that case.
> 
> I spun up a few libvirt guests and surprisingly this all seems to
> work.  I have no idea why :-)  I agree with you that it shouldn't work
> because the labels should get stomped on by the different connections,
> but it seems libvirt is being cleverer somehow.

For any disk with <sharable/> set, libvirt ignores the VM MCS level
and labels the disk with a simple svirt_image_t label which allows
*every* VM running on the host to have read-write access to the
disk.

You can't share disks between VMs, if they have MCS levels attached,
unless the VMs all have the same MCS level themselves.


Regards,
Daniel
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