xen/domain: check IOMMU options doesn't contain unknown bits set

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: 59b27f360e3d9dc0378c1288e67a91fa41a77158
master date: 2020-10-02 08:38:50 +0200

diff --git a/xen/common/domain.c b/xen/common/domain.c
index a275a35c4fa3b01005f1509c80399dcf8831e42d..7bacf7cfede559d075c1bfc7621abb565edd8b56 100644 (file)
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -310,6 +310,12 @@ static int sanitise_domain_config(struct xen_domctl_createdomain *config)
         return -EINVAL;
     }
 
+    if ( config->iommu_opts & ~XEN_DOMCTL_IOMMU_no_sharept )
+    {
+        dprintk(XENLOG_INFO, "Unknown IOMMU options %#x\n", config->iommu_opts);
+        return -EINVAL;
+    }
+
     if ( !(config->flags & XEN_DOMCTL_CDF_iommu) && config->iommu_opts )
     {
         dprintk(XENLOG_INFO,