From: Julien Grall <julien.grall@arm.com>
Date: Mon, 9 Oct 2017 13:23:40 +0000 (+0100)
Subject: xen/arm: mm: Handle permission flags when adding a new mapping
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~1170
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=6b88beed40c756aaff018d286f4de31351240a93;p=xen.git

xen/arm: mm: Handle permission flags when adding a new mapping

Currently, all the new mappings will be read-write non-executable. Allow the
caller to use other permissions.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index c1dad61a20..2329ccee83 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1022,6 +1022,9 @@ static int create_xen_entries(enum xenmap_operation op,
                 if ( op == RESERVE )
                     break;
                 pte = mfn_to_xen_entry(mfn, PAGE_AI_MASK(flags));
+                pte.pt.ro = PAGE_RO_MASK(flags);
+                pte.pt.xn = PAGE_XN_MASK(flags);
+                BUG_ON(!pte.pt.ro && !pte.pt.xn);
                 pte.pt.table = 1;
                 write_pte(entry, pte);
                 break;