ARM: make vectors page inaccessible from userspace

If kuser helpers are not provided by the kernel, disable user access to
the vectors page.  With the kuser helpers gone, there is no reason for
this page to be visible to userspace.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 9ea274d1af69..ca46f413d867 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1205,7 +1205,11 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
         map.pfn = __phys_to_pfn(virt_to_phys(vectors));
         map.virtual = 0xffff0000;
         map.length = PAGE_SIZE;
+#ifdef CONFIG_KUSER_HELPERS
         map.type = MT_HIGH_VECTORS;
+#else
+        map.type = MT_LOW_VECTORS;
+#endif
         create_mapping(&map);
 
         if (!vectors_high()) {