[Xen-devel] [PATCH 04/24] xen: use XSM instead of IS_PRIV for getdomaininfo

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

The XEN_DOMCTL_getdomaininfo domctl does not allow manipulation of
domains, only basic information such as size and state, so its use
does not fully justify making a domain privileged. XSM modules can also
provide fine-grained control over what domains are visible to domains
that call getdomaininfo.

If XSM is disabled (either at compile time or by using the dummy XSM
module) then there is no change in behavior: only IS_PRIV domains can
use this domctl. If enabled, the XSM module controls access.

Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
 xen/common/domctl.c |    4 ++++
 xen/xsm/dummy.c     |    2 ++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 8001a91..904fb45 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -264,6 +264,10 @@ long do_domctl(XEN_GUEST_HANDLE(xen_domctl_t) u_domctl)
             return -EPERM;
         break;
     }
+#ifdef XSM_ENABLE
+    case XEN_DOMCTL_getdomaininfo:
+        break;
+#endif
     default:
         if ( !IS_PRIV(current->domain) )
             return -EPERM;
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index acf9c8a..d99f886 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -66,6 +66,8 @@ static int dummy_scheduler (struct domain *d)
 
 static int dummy_getdomaininfo (struct domain *d)
 {
+    if ( !IS_PRIV(current->domain) )
+        return -EPERM;
     return 0;
 }
 
-- 
1.7.7.6


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