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

[patchbot@xxxxxxx]

commit 59b27f360e3d9dc0378c1288e67a91fa41a77158
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Fri Oct 2 08:38:50 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Oct 2 08:38:50 2020 +0200

    xen/domain: check IOMMU options doesn't contain unknown bits set
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/domain.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index 8cfa2e0b6b..c4a480fa14 100644
--- 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,
--
generated by git-patchbot for /home/xen/git/xen.git#staging