From: Dave Anderson <anderson@redhat.com>
Subject: Re: [RHEL 5.1 PATCH] BZ 222826: [RHEL5] Gdb does not accurately output   the backtrace.
Date: Fri, 16 Feb 2007 10:24:03 -0500
Bugzilla: 222826
Message-Id: <45D5CC93.60E5B3BF@redhat.com>
Changelog: [mm] Gdb does not accurately output the backtrace.


>     [PATCH] Fix gate_vma.vm_flags
>
>     This patch fixes the initialization of gate_vma.vm_flags and
>     gate_vma.vm_page_prot to reflect reality.  This makes the "[vdso]" line in
>     /proc/PID/maps correctly show r-xp instead of ---p, when gate_vma is used
>     (CONFIG_COMPAT_VDSO on i386).
>

--- linux-2.6.18.ia64/mm/memory.c.orig
+++ linux-2.6.18.ia64/mm/memory.c
@@ -2683,8 +2683,8 @@ static int __init gate_vma_init(void)
 	gate_vma.vm_mm = NULL;
 	gate_vma.vm_start = FIXADDR_USER_START;
 	gate_vma.vm_end = FIXADDR_USER_END;
-	gate_vma.vm_page_prot = PAGE_READONLY;
-	gate_vma.vm_flags = 0;
+	gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
+	gate_vma.vm_page_prot = __P101;
 	return 0;
 }
 __initcall(gate_vma_init);