From: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 arch/i386/kernel/sysenter.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

Index: 2.6/arch/i386/kernel/sysenter.c
===================================================================
--- 2.6.orig/arch/i386/kernel/sysenter.c
+++ 2.6/arch/i386/kernel/sysenter.c
@@ -183,7 +183,9 @@ struct vm_area_struct *get_gate_vma(stru
 
 int in_gate_area(struct task_struct *task, unsigned long addr)
 {
-	return 0;
+	const struct vm_area_struct *vma = get_gate_vma(task);
+
+	return vma && addr >= vma->vm_start && addr < vma->vm_end;
 }
 
 int in_gate_area_no_task(unsigned long addr)

--