From 59b27f360e3d9dc0378c1288e67a91fa41a77158 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Roger=20Pau=20Monn=C3=A9?= <roger.pau@citrix.com>
Date: Fri, 2 Oct 2020 08:38:50 +0200
Subject: [PATCH] xen/domain: check IOMMU options doesn't contain unknown bits
 set
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Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
 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,
-- 
2.30.2