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[Xen-devel] [PATCH] Extra check in grant table code for mapping of shared frame


  • To: xen-devel@xxxxxxxxxxxxx
  • From: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
  • Date: Thu, 13 Sep 2012 11:27:48 -0400
  • Cc: keir@xxxxxxx, andres@xxxxxxxxxxxxxx, tim@xxxxxxx, JBeulich@xxxxxxxx
  • Delivery-date: Thu, 13 Sep 2012 15:21:50 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

 xen/common/grant_table.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)


Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>

diff -r 5ce5b53ea68f -r 40b91bed1275 xen/common/grant_table.c
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -649,9 +649,12 @@ __gnttab_map_grant_ref(
     }
     else if ( owner == rd || owner == dom_cow )
     {
-        if ( gnttab_host_mapping_get_page_type(op, ld, rd) &&
-             !get_page_type(pg, PGT_writable_page) )
-            goto could_not_pin;
+        if ( gnttab_host_mapping_get_page_type(op, ld, rd) )
+        {
+            if ( (owner == dom_cow) ||
+                 !get_page_type(pg, PGT_writable_page) )
+                goto could_not_pin;
+        }
 
         nr_gets++;
         if ( op->flags & GNTMAP_host_map )

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