From: Jan Beulich <jbeulich@novell.com>
Date: Wed, 15 Aug 2007 10:38:54 +0000 (+0200)
Subject: [PATCH] i386: allow debuggers to access the vsyscall page with compat vDSO
X-Git-Tag: v2.6.20.21~29
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e4c8331d3245f8de7a0d59acc4f22bf13d061c0;p=thirdparty%2Fkernel%2Fstable.git

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

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>
---

diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c
index 666f70d926191..05773128440dc 100644
--- a/arch/i386/kernel/sysenter.c
+++ b/arch/i386/kernel/sysenter.c
@@ -183,7 +183,9 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
 
 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)