[Xen-changelog] [xen-unstable] x86: compat_show_guest_stack() should not truncate MFN

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1357561709 -3600
# Node ID 8e942f2f3b45edc5bb1f7a6e05de288342426f0d
# Parent  23c4bbc0111dd807561b2c62cbc5798220943a0d
x86: compat_show_guest_stack() should not truncate MFN

Re-using "addr" here was a mistake, as it is a 32-bit quantity.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 23c4bbc0111d -r 8e942f2f3b45 xen/arch/x86/x86_64/compat/traps.c
--- a/xen/arch/x86/x86_64/compat/traps.c        Mon Jan 07 12:58:09 2013 +0100
+++ b/xen/arch/x86/x86_64/compat/traps.c        Mon Jan 07 13:28:29 2013 +0100
@@ -20,11 +20,12 @@ void compat_show_guest_stack(struct vcpu
     if ( v != current )
     {
         struct vcpu *vcpu;
+        unsigned long mfn;
 
         ASSERT(guest_kernel_mode(v, regs));
-        addr = read_cr3() >> PAGE_SHIFT;
+        mfn = read_cr3() >> PAGE_SHIFT;
         for_each_vcpu( v->domain, vcpu )
-            if ( pagetable_get_pfn(vcpu->arch.guest_table) == addr )
+            if ( pagetable_get_pfn(vcpu->arch.guest_table) == mfn )
                 break;
         if ( !vcpu )
         {

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