Re: [Xen-devel] [PATCH for-4.5] flask/policy: Example policy updates for migration

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-12-08 at 10:52 -0500, Konrad Rzeszutek Wilk wrote:
> On Mon, Dec 08, 2014 at 09:48:07AM +0000, Ian Campbell wrote:
> > On Fri, 2014-12-05 at 12:03 -0500, Daniel De Graaf wrote:
> > > The example XSM policy was missing permission for dom0_t to migrate
> > > domains; add these permissions.
> > > 
> > > Reported-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> > > Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> > 
> > Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > 
> > Konrad, we should take this for 4.5, in order to have a working example
> > XSM policy. There's 0 risk to non-XSM systems, or systems with custom
> 
> Thought this looks like it never worked in the past then? As in, this
> is not a regression but a bug that had existed for quite a while?

AIUI it has worked in the past, i.e. I remember applying other series
from Daniel to fix it for previous releases. This patch is the policy
catching up with the developments during 4.5.

> 
> > XSM policies and clear benefits to XSM systems using the example policy.
> > 
> > > ---
> > > 
> > > This has been tested with xl save/restore on a PV domain, which now
> > > succeeds without producing AVC denials.
> > > 
> > >  tools/flask/policy/policy/modules/xen/xen.if | 11 +++++++----
> > >  tools/flask/policy/policy/modules/xen/xen.te |  3 +++
> > >  2 files changed, 10 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/tools/flask/policy/policy/modules/xen/xen.if 
> > > b/tools/flask/policy/policy/modules/xen/xen.if
> > > index fa69c9d..bf5e135 100644
> > > --- a/tools/flask/policy/policy/modules/xen/xen.if
> > > +++ b/tools/flask/policy/policy/modules/xen/xen.if
> > > @@ -48,11 +48,13 @@ define(`create_domain_common', `
> > >   allow $1 $2:domain { create max_vcpus setdomainmaxmem setaddrsize
> > >                   getdomaininfo hypercall setvcpucontext setextvcpucontext
> > >                   getscheduler getvcpuinfo getvcpuextstate getaddrsize
> > > -                 getaffinity setaffinity };
> > > - allow $1 $2:domain2 { set_cpuid settsc setscheduler setclaim 
> > > set_max_evtchn set_vnumainfo get_vnumainfo psr_cmt_op configure_domain };
> > > +                 getaffinity setaffinity setvcpuextstate };
> > > + allow $1 $2:domain2 { set_cpuid settsc setscheduler setclaim
> > > +                 set_max_evtchn set_vnumainfo get_vnumainfo cacheflush
> > > +                 psr_cmt_op configure_domain };
> > >   allow $1 $2:security check_context;
> > >   allow $1 $2:shadow enable;
> > > - allow $1 $2:mmu { map_read map_write adjust memorymap physmap pinpage 
> > > mmuext_op };
> > > + allow $1 $2:mmu { map_read map_write adjust memorymap physmap pinpage 
> > > mmuext_op updatemp };
> > >   allow $1 $2:grant setup;
> > >   allow $1 $2:hvm { cacheattr getparam hvmctl irqlevel pciroute sethvmc
> > >                   setparam pcilevel trackdirtyvram nested };
> > > @@ -80,7 +82,7 @@ define(`create_domain_build_label', `
> > >  define(`manage_domain', `
> > >   allow $1 $2:domain { getdomaininfo getvcpuinfo getaffinity
> > >                   getaddrsize pause unpause trigger shutdown destroy
> > > -                 setaffinity setdomainmaxmem getscheduler };
> > > +                 setaffinity setdomainmaxmem getscheduler resume };
> > >      allow $1 $2:domain2 set_vnumainfo;
> > >  ')
> > >  
> > > @@ -88,6 +90,7 @@ define(`manage_domain', `
> > >  #   Allow creation of a snapshot or migration image from a domain
> > >  #   (inbound migration is the same as domain creation)
> > >  define(`migrate_domain_out', `
> > > + allow $1 domxen_t:mmu map_read;
> > >   allow $1 $2:hvm { gethvmc getparam irqlevel };
> > >   allow $1 $2:mmu { stat pageinfo map_read };
> > >   allow $1 $2:domain { getaddrsize getvcpucontext getextvcpucontext 
> > > getvcpuextstate pause destroy };
> > > diff --git a/tools/flask/policy/policy/modules/xen/xen.te 
> > > b/tools/flask/policy/policy/modules/xen/xen.te
> > > index d214470..c0128aa 100644
> > > --- a/tools/flask/policy/policy/modules/xen/xen.te
> > > +++ b/tools/flask/policy/policy/modules/xen/xen.te
> > > @@ -129,12 +129,14 @@ create_domain(dom0_t, domU_t)
> > >  manage_domain(dom0_t, domU_t)
> > >  domain_comms(dom0_t, domU_t)
> > >  domain_comms(domU_t, domU_t)
> > > +migrate_domain_out(dom0_t, domU_t)
> > >  domain_self_comms(domU_t)
> > >  
> > >  declare_domain(isolated_domU_t)
> > >  create_domain(dom0_t, isolated_domU_t)
> > >  manage_domain(dom0_t, isolated_domU_t)
> > >  domain_comms(dom0_t, isolated_domU_t)
> > > +migrate_domain_out(dom0_t, isolated_domU_t)
> > >  domain_self_comms(isolated_domU_t)
> > >  
> > >  # Declare a boolean that denies creation of prot_domU_t domains
> > > @@ -142,6 +144,7 @@ gen_bool(prot_doms_locked, false)
> > >  declare_domain(prot_domU_t)
> > >  if (!prot_doms_locked) {
> > >   create_domain(dom0_t, prot_domU_t)
> > > + migrate_domain_out(dom0_t, prot_domU_t)
> > >  }
> > >  domain_comms(dom0_t, prot_domU_t)
> > >  domain_comms(domU_t, prot_domU_t)
> > 
> > 



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