[Xen-devel] [PATCH v5 14/15] xsm, argo: notify: don't describe rings that cannot be sent to

[Christopher Clark <christopher.w.clark@xxxxxxxxx>]

Signed-off-by: Christopher Clark <christopher.clark6@xxxxxxxxxxxxxx>
Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
v3 #10 Roger: drop out label, use return -EFAULT in fill_ring_data
v3: Add Daniel's Acked-by

 xen/common/argo.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/xen/common/argo.c b/xen/common/argo.c
index 4631f66..c58aba9 100644
--- a/xen/common/argo.c
+++ b/xen/common/argo.c
@@ -1352,6 +1352,17 @@ fill_ring_data(const struct domain *currd,
     if ( !dst_d || !dst_d->argo )
         goto out;
 
+    /*
+     * Don't supply information about rings that a guest is not
+     * allowed to send to.
+     */
+    ret = xsm_argo_send(currd, dst_d);
+    if ( ret )
+    {
+        put_domain(dst_d);
+        return ret;
+    }
+
     read_lock(&dst_d->argo->rings_L2_rwlock);
 
     ring_info = find_ring_info_by_match(dst_d, ent.ring.aport,
-- 
2.7.4


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