Map kernel .text read-only.

Spotted by deraadt@

diff --git a/sys/arch/armv7/armv7/armv7_machdep.c b/sys/arch/armv7/armv7/armv7_machdep.c
index aa71259..15b1195 100644 (file)
--- a/sys/arch/armv7/armv7/armv7_machdep.c
+++ b/sys/arch/armv7/armv7/armv7_machdep.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: armv7_machdep.c,v 1.36 2016/08/15 21:04:32 patrick Exp $ */
+/*     $OpenBSD: armv7_machdep.c,v 1.37 2016/08/19 15:31:10 kettenis Exp $ */
 /*     $NetBSD: lubbock_machdep.c,v 1.2 2003/07/15 00:25:06 lukem Exp $ */
 
 /*
@@ -640,7 +640,7 @@ initarm(void *arg0, void *arg1, void *arg2)
 
                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    loadaddr + logical, textsize,
-                   PROT_READ | PROT_WRITE | PROT_EXEC, PTE_CACHE);
+                   PROT_READ | PROT_EXEC, PTE_CACHE);
                logical += pmap_map_chunk(l1pagetable, KERNEL_BASE + logical,
                    loadaddr + logical, totalsize - textsize,
                    PROT_READ | PROT_WRITE, PTE_CACHE);