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Re: [libvirt] [PATCH] conf: Fix parsing of seclabels without model



On Thu, Aug 30, 2012 at 07:12:26PM +0200, Jiri Denemark wrote:
> On Thu, Aug 30, 2012 at 13:19:31 -0300, Marcelo Cerri wrote:
> > With this patch libvirt tries to assign a model to seclabels when model
> > is missing. Libvirt will look up at host's capabilities and assign a
> > model in order to each seclabel that doesn't have a model assigned.
> > 
> > This patch fixes:
> > 
> > 1. The problem with existing guests that have a seclabel defined in its XML.
> > 2. A XML parse error when a guest is restored.
> > 
> > Signed-off-by: Marcelo Cerri <mhcerri linux vnet ibm com>
> > ---
> >  src/conf/domain_conf.c | 56 ++++++++++++++++++++++++++------------------------
> >  1 file changed, 29 insertions(+), 27 deletions(-)
> 
> I think this is trying to fix the issue at a wrong place. It's not that XML
> generated by older libvirtd is not correctly parsed by current libvirtd. The
> problem is that *current* libvirtd creates an XML that it cannot parse back.
> Thus we should rather fix the code that formats the XML.
> 
> On that front, I'm concerned about migration compatibility of this new
> security driver code. If we just blindly emit <seclabel type='dynamic'
> model='dac' relabel='yes'> element into the XML, I'm pretty sure an older
> libvirtd will complain about it even though the element was not used to do
> anything special that would be done anyway (that is, if labels are the default
> qemu_user:qemu_group).

Yes, we should not auto-add a <seclabel> for model=dac unless we have
configured it to auto-assign a private uid:gid pair per guest. If it is
operating in the mode where it just uses a fixed uid:gid pair we should
not emit the seclabel.

Daniel
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