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pte0 is used to map the page required by bioscall() trampoline code, so 

add VM_PROT_EXECUTE protection for it.

Currently, this does not change much, as page execute permission is not
enforced for i386 (except for Xen, where BIOS calls are not used anyway).
This commit is contained in:
jym 2010-07-15 22:19:19 +00:00
parent 6533f925b7
commit dfcbd5678f
1 changed files with 3 additions and 3 deletions
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6
sys/arch/i386/i386/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.688 2010/07/14 14:42:40 jym Exp $ */
/* $NetBSD: machdep.c,v 1.689 2010/07/15 22:19:19 jym Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998, 2000, 2004, 2006, 2008, 2009
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.688 2010/07/14 14:42:40 jym Exp $");
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.689 2010/07/15 22:19:19 jym Exp $");
#include "opt_beep.h"
#include "opt_compat_ibcs2.h"
@ -1236,7 +1236,7 @@ init386_pte0(void)
paddr = 4 * PAGE_SIZE;
vaddr = (vaddr_t)vtopte(0);
pmap_kenter_pa(vaddr, paddr, VM_PROT_READ | VM_PROT_WRITE, 0);
pmap_kenter_pa(vaddr, paddr, VM_PROT_ALL, 0);
pmap_update(pmap_kernel());
/* make sure it is clean before using */
memset((void *)vaddr, 0, PAGE_SIZE);