[Xen-changelog] [xen-4.2-testing] x86: compat_show_guest_stack() should not truncate MFN

[Xen patchbot-4.2-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1357725196 -3600
# Node ID 3444f03cf52d91e59b9cdcf7478f8dc39273f49d
# Parent  b2b486d4331f6b3bb43bda8fc62b6a9b32d7b8ba
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>
xen-unstable changeset: 26332:8e942f2f3b45
xen-unstable date: Mon Jan  7 12:28:29 UTC 2013
---


diff -r b2b486d4331f -r 3444f03cf52d xen/arch/x86/x86_64/compat/traps.c
--- a/xen/arch/x86/x86_64/compat/traps.c        Wed Jan 09 10:51:54 2013 +0100
+++ b/xen/arch/x86/x86_64/compat/traps.c        Wed Jan 09 10:53:16 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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