linux-kernel - [PATCH] i386: allow debuggers to access the vsyscall page with compat vDSO

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Message-Id: <468BAB30.76E4.0078.0@novell.com>
Date:	Wed, 04 Jul 2007 13:14:08 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Andi Kleen" <ak@...e.de>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] i386: allow debuggers to access the vsyscall page with
	compat vDSO

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

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

--- linux-2.6.22-rc7/arch/i386/kernel/sysenter.c	2007-07-03 10:57:29.000000000 +0200
+++ 2.6.22-rc7-i386-in-gate-area/arch/i386/kernel/sysenter.c	2007-07-04 11:39:35.000000000 +0200
@@ -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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