[Xen-devel] [PATCH v2 3/4] xen: teach KASAN about grant tables

[Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>]

From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

Otherwise it produces lots of false positives when a guest starts using
PV I/O devices.

Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
v1 --> v2:
- no changes

RFC --> v1:
- Slightly clarified the commit message
---
 drivers/xen/grant-table.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 7b36b51cdb9f..ce95f7232de6 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -1048,6 +1048,7 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
                        foreign = xen_page_foreign(pages[i]);
                        foreign->domid = map_ops[i].dom;
                        foreign->gref = map_ops[i].ref;
+                       kasan_alloc_pages(pages[i], 0);
                        break;
                }
 
@@ -1084,8 +1085,10 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref 
*unmap_ops,
        if (ret)
                return ret;
 
-       for (i = 0; i < count; i++)
+       for (i = 0; i < count; i++) {
                ClearPageForeign(pages[i]);
+               kasan_free_pages(pages[i], 0);
+       }
 
        return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count);
 }
-- 
2.17.1


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