From: Jan Beulich <jbeulich@suse.com>
Date: Mon, 7 Jan 2013 12:28:29 +0000 (+0100)
Subject: x86: compat_show_guest_stack() should not truncate MFN
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~7474
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=1e86302d8c2ea279fee66ee7c2368258426ef876;p=xen.git

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@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
---

diff --git a/xen/arch/x86/x86_64/compat/traps.c b/xen/arch/x86/x86_64/compat/traps.c
index 39c5656353..7add636a10 100644
--- a/xen/arch/x86/x86_64/compat/traps.c
+++ b/xen/arch/x86/x86_64/compat/traps.c
@@ -20,11 +20,12 @@ void compat_show_guest_stack(struct vcpu *v, struct cpu_user_regs *regs,
     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 )
         {