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$NetBSD: patch-CVE-2013-1917-1,v 1.1 2013/04/19 14:02:45 bouyer Exp $
http://lists.xen.org/archives/html/xen-announce/2013-04/msg00005.html
--- xen/arch/x86/acpi/suspend.c.orig
+++ xen/arch/x86/acpi/suspend.c
@@ -81,8 +81,12 @@ void restore_rest_processor_state(void)
}
#else /* !defined(CONFIG_X86_64) */
- if ( supervisor_mode_kernel && cpu_has_sep )
- wrmsr(MSR_IA32_SYSENTER_ESP, &this_cpu(init_tss).esp1, 0);
+ if ( cpu_has_sep )
+ {
+ wrmsr(MSR_IA32_SYSENTER_CS, 0, 0);
+ if ( supervisor_mode_kernel )
+ wrmsr(MSR_IA32_SYSENTER_ESP, &this_cpu(init_tss).esp1, 0);
+ }
#endif
/* Maybe load the debug registers. */
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