Bug#434752: Kernel hangs when I echo 0 > /proc/sys/vm/vdso_enabled
tags 434752 + patch
stop
On Thu, Jul 26, 2007, Loïc Minier wrote:
> Since some months, I get unusable backtraces from gdb; I was pointed at
> an OpenSuse bug at:
> <https://bugzilla.novell.com/show_bug.cgi?id=258433>
I extracted the patch Novell/OpenSuse applied to its kernel, would be
nice to get it in Debian.
--
Loïc Minier
Subject: i386: allow debuggers to access the vsyscall page with compat vDSO
From: "Jan Beulich" <jbeulich@novell.com>
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
arch/i386/kernel/sysenter.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux/arch/i386/kernel/sysenter.c
===================================================================
--- linux.orig/arch/i386/kernel/sysenter.c
+++ linux/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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