Re: Strange AVC with latest rawhide kernel.

[Daniel J Walsh <dwalsh@redhat.com>]

On Fri, 2016-02-26 at 10:49 -0500, Stephen Smalley wrote:
> On 02/26/2016 10:46 AM, Paul Moore wrote:
> > 
> > On Fri, Feb 26, 2016 at 7:54 AM, Daniel J Walsh <dwalsh@redhat.com>
> > wrote:
> > > 
> > > On Thu, 2016-02-25 at 15:54 -0500, Stephen Smalley wrote:
> > > > 
> > > > On 02/25/2016 03:28 PM, Daniel J Walsh wrote:
> > > > > 
> > > > > Currently typebounds only allows one instance.
> > > > It is a hierarchy, where each child has a single parent.  So
> > > > you can
> > > > define hierarchies like:
> > > > typebounds unconfined_t docker_t;
> > > > typebounds docker_t svirt_lxc_net_t;
> > > > and then they can both transition because they are both
> > > > ancestors.
> > > Awesome idea.
> > Would that resolve all your problems Dan with Docker, runc, etc.?
> > > 
> > > From our discussions the other day I thought you needed the
> > > ability to
> > transition to svirt_lxc_net_t from domains other than unconfined_t
> > and
> > docker_t ... or was I misunderstanding you?
> > 
> Note that it is only exec-based transitions that are affected by 
> NO_NEW_PRIVS, so one can always leverage dynamic transitions (i.e. 
> setcon) without requiring typebounds.
> 
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> 

BTW I turned on the expand-check=1 in semanage.conf and semodule -B
went nuts and crashed.

On this policy.

policy_module(mypol, 1.0)

require {
	type svirt_lxc_net_t;
	type docker_t;
	type svirt_sandbox_file_t;
	type unconfined_t;
}
allow unconfined_t svirt_sandbox_file_t:file entrypoint;
allow docker_t svirt_sandbox_file_t:file entrypoint;
typebounds unconfined_t docker_t;
typebounds docker_t svirt_lxc_net_t;