[patch 15/20] i386: allow debuggers to access the vsyscall pagewith compat vDSO

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Jan Beulich <jbeulich@xxxxxxxxxx>


From: Jan Beulich <jbeulich@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/i386/kernel/sysenter.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/i386/kernel/sysenter.c
+++ b/arch/i386/kernel/sysenter.c
@@ -336,7 +336,9 @@ 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)

-- 
-
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