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Disable preemption over LDT modifications.

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This commit is contained in:
ad 2008-05-11 16:13:34 +00:00
parent 3cd3c8ccbc
commit 8250c8f097
1 changed files with 4 additions and 2 deletions
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6
sys/arch/x86/x86/sys_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: sys_machdep.c,v 1.14 2008/04/28 20:23:40 martin Exp $ */ /* $NetBSD: sys_machdep.c,v 1.15 2008/05/11 16:13:34 ad Exp $ */
/*- /*-
* Copyright (c) 1998, 2007 The NetBSD Foundation, Inc. * Copyright (c) 1998, 2007 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_machdep.c,v 1.14 2008/04/28 20:23:40 martin Exp $"); __KERNEL_RCSID(0, "$NetBSD: sys_machdep.c,v 1.15 2008/05/11 16:13:34 ad Exp $");
#include "opt_compat_netbsd.h" #include "opt_compat_netbsd.h"
#include "opt_mtrr.h" #include "opt_mtrr.h"
@ -344,6 +344,7 @@ x86_set_ldt1(struct lwp *l, struct x86_set_ldt_args *ua,
free_ldt = NULL; free_ldt = NULL;
free_len = 0; free_len = 0;
mutex_enter(&pmap->pm_lock); mutex_enter(&pmap->pm_lock);
kpreempt_disable();
if (pmap->pm_ldt == 0 || (ua->start + ua->num) > pmap->pm_ldt_len) { if (pmap->pm_ldt == 0 || (ua->start + ua->num) > pmap->pm_ldt_len) {
if (pmap->pm_flags & PMF_USER_LDT) if (pmap->pm_flags & PMF_USER_LDT)
ldt_len = pmap->pm_ldt_len; ldt_len = pmap->pm_ldt_len;
@ -406,6 +407,7 @@ copy:
for (i = 0, n = ua->start; i < ua->num; i++, n++) for (i = 0, n = ua->start; i < ua->num; i++, n++)
pmap->pm_ldt[n] = descv[i]; pmap->pm_ldt[n] = descv[i];
kpreempt_enable();
mutex_exit(&pmap->pm_lock); mutex_exit(&pmap->pm_lock);
if (new_ldt != NULL) if (new_ldt != NULL)