[Xen-devel] [PATCH 07/17] flask: unify {get, set}vcpucontext permissions

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

These permissions were initially split because they were in separate
domctls, but this split is very unlikely to actually provide security
benefits: it would require a carefully contrived situation for a domain
to both need access to one type of CPU register and also need to be
prohibited from accessing another type.

Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 tools/flask/policy/modules/dom0.te  |  1 -
 tools/flask/policy/modules/xen.if   |  7 +++----
 xen/xsm/flask/hooks.c               | 20 ++++++--------------
 xen/xsm/flask/policy/access_vectors | 16 ++++++----------
 4 files changed, 15 insertions(+), 29 deletions(-)

diff --git a/tools/flask/policy/modules/dom0.te 
b/tools/flask/policy/modules/dom0.te
index ef6a986..d228b24 100644
--- a/tools/flask/policy/modules/dom0.te
+++ b/tools/flask/policy/modules/dom0.te
@@ -34,7 +34,6 @@ allow dom0_t dom0_t:domain {
        setvcpucontext max_vcpus setaffinity getaffinity getscheduler
        getdomaininfo getvcpuinfo getvcpucontext setdomainmaxmem setdomainhandle
        setdebugging hypercall settime setaddrsize getaddrsize trigger
-       getextvcpucontext setextvcpucontext getvcpuextstate setvcpuextstate
        getpodtarget setpodtarget set_misc_info set_virq_handler
 };
 allow dom0_t dom0_t:domain2 {
diff --git a/tools/flask/policy/modules/xen.if 
b/tools/flask/policy/modules/xen.if
index 00d1bbb..fd96303 100644
--- a/tools/flask/policy/modules/xen.if
+++ b/tools/flask/policy/modules/xen.if
@@ -47,9 +47,8 @@ define(`declare_build_label', `
 
 define(`create_domain_common', `
        allow $1 $2:domain { create max_vcpus setdomainmaxmem setaddrsize
-                       getdomaininfo hypercall setvcpucontext setextvcpucontext
-                       getscheduler getvcpuinfo getvcpuextstate getaddrsize
-                       getaffinity setaffinity setvcpuextstate };
+                       getdomaininfo hypercall setvcpucontext getscheduler
+                       getvcpuinfo getaddrsize getaffinity setaffinity };
        allow $1 $2:domain2 { set_cpuid settsc setscheduler setclaim
                        set_max_evtchn set_vnumainfo get_vnumainfo cacheflush
                        psr_cmt_op psr_cat_op soft_reset };
@@ -94,7 +93,7 @@ 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 };
+       allow $1 $2:domain { getaddrsize getvcpucontext pause destroy };
        allow $1 $2:domain2 gettsc;
        allow $1 $2:shadow { enable disable logdirty };
 ')
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 20d46c8..a8d45e7 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -630,10 +630,16 @@ static int flask_domctl(struct domain *d, int cmd)
     case XEN_DOMCTL_setdomainhandle:
         return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__SETDOMAINHANDLE);
 
+    case XEN_DOMCTL_set_ext_vcpucontext:
+    case XEN_DOMCTL_set_vcpu_msrs:
     case XEN_DOMCTL_setvcpucontext:
+    case XEN_DOMCTL_setvcpuextstate:
         return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__SETVCPUCONTEXT);
 
+    case XEN_DOMCTL_get_ext_vcpucontext:
+    case XEN_DOMCTL_get_vcpu_msrs:
     case XEN_DOMCTL_getvcpucontext:
+    case XEN_DOMCTL_getvcpuextstate:
         return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__GETVCPUCONTEXT);
 
     case XEN_DOMCTL_getvcpuinfo:
@@ -675,20 +681,6 @@ static int flask_domctl(struct domain *d, int cmd)
     case XEN_DOMCTL_pin_mem_cacheattr:
         return current_has_perm(d, SECCLASS_HVM, HVM__CACHEATTR);
 
-    case XEN_DOMCTL_set_ext_vcpucontext:
-    case XEN_DOMCTL_set_vcpu_msrs:
-        return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__SETEXTVCPUCONTEXT);
-
-    case XEN_DOMCTL_get_ext_vcpucontext:
-    case XEN_DOMCTL_get_vcpu_msrs:
-        return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__GETEXTVCPUCONTEXT);
-
-    case XEN_DOMCTL_setvcpuextstate:
-        return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__SETVCPUEXTSTATE);
-
-    case XEN_DOMCTL_getvcpuextstate:
-        return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__GETVCPUEXTSTATE);
-
     case XEN_DOMCTL_sendtrigger:
         return current_has_perm(d, SECCLASS_DOMAIN, DOMAIN__TRIGGER);
 
diff --git a/xen/xsm/flask/policy/access_vectors 
b/xen/xsm/flask/policy/access_vectors
index 3d29042..7e69ede 100644
--- a/xen/xsm/flask/policy/access_vectors
+++ b/xen/xsm/flask/policy/access_vectors
@@ -111,6 +111,9 @@ class xen2
 class domain
 {
 # XEN_DOMCTL_setvcpucontext
+# XEN_DOMCTL_setvcpuextstate
+# XEN_DOMCTL_set_ext_vcpucontext
+# XEN_DOMCTL_set_vcpu_msrs
     setvcpucontext
 # XEN_DOMCTL_pausedomain
     pause
@@ -142,6 +145,9 @@ class domain
 # XEN_DOMCTL_getvcpuinfo
     getvcpuinfo
 # XEN_DOMCTL_getvcpucontext
+# XEN_DOMCTL_get_ext_vcpucontext
+# XEN_DOMCTL_getvcpuextstate
+# XEN_DOMCTL_get_vcpu_msrs
     getvcpucontext
 # XEN_DOMCTL_max_mem
     setdomainmaxmem
@@ -166,16 +172,6 @@ class domain
     getaddrsize
 # XEN_DOMCTL_sendtrigger
     trigger
-# XEN_DOMCTL_get_ext_vcpucontext
-# XEN_DOMCTL_set_vcpu_msrs
-    getextvcpucontext
-# XEN_DOMCTL_set_ext_vcpucontext
-# XEN_DOMCTL_get_vcpu_msrs
-    setextvcpucontext
-# XEN_DOMCTL_getvcpuextstate
-    getvcpuextstate
-# XEN_DOMCTL_setvcpuextstate
-    setvcpuextstate
 # XENMEM_get_pod_target
     getpodtarget
 # XENMEM_set_pod_target
-- 
2.7.4


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