[src/trunk]: src/sys/arch/x86/x86 Forbid 64bit entries. That's it, now we sup...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b7e367cc4ec2
branches:  trunk
changeset: 356930:b7e367cc4ec2
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sat Oct 21 08:27:19 2017 +0000

description:
Forbid 64bit entries. That's it, now we support USER_LDT on amd64.

diffstat:

 sys/arch/x86/x86/sys_machdep.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (30 lines):

diff -r e35ebef43cec -r b7e367cc4ec2 sys/arch/x86/x86/sys_machdep.c
--- a/sys/arch/x86/x86/sys_machdep.c    Sat Oct 21 08:08:26 2017 +0000
+++ b/sys/arch/x86/x86/sys_machdep.c    Sat Oct 21 08:27:19 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sys_machdep.c,v 1.42 2017/10/21 06:55:54 maxv Exp $    */
+/*     $NetBSD: sys_machdep.c,v 1.43 2017/10/21 08:27:19 maxv Exp $    */
 
 /*
  * Copyright (c) 1998, 2007, 2009, 2017 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_machdep.c,v 1.42 2017/10/21 06:55:54 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_machdep.c,v 1.43 2017/10/21 08:27:19 maxv Exp $");
 
 #include "opt_mtrr.h"
 #include "opt_pmc.h"
@@ -249,6 +249,11 @@
        for (i = 0; i < ua->num; i++) {
                union descriptor *desc = &descv[i];
 
+#ifdef __x86_64__
+               if (desc->sd.sd_long != 0)
+                       return EACCES;
+#endif
+
                switch (desc->sd.sd_type) {
                case SDT_SYSNULL:
                        desc->sd.sd_p = 0;