[Xen-changelog] [xen-4.0-testing] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only)

["Xen patchbot-4.0-testing" <patchbot-4.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1292415245 0
# Node ID 66a6203d27fdd02c1b619343e25e4a3d379aaac9
# Parent  4e689840622fcae76b40d036ca5b3f6003f94997
x86/32on64: zero-extend hypercall index before use in memory access (debug mode 
only)

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
xen-unstable changeset:   22540:d8279118b4bb
xen-unstable date:        Wed Dec 15 12:10:31 2010 +0000
---
 xen/arch/x86/x86_64/compat/entry.S |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r 4e689840622f -r 66a6203d27fd xen/arch/x86/x86_64/compat/entry.S
--- a/xen/arch/x86/x86_64/compat/entry.S        Wed Dec 15 12:13:47 2010 +0000
+++ b/xen/arch/x86/x86_64/compat/entry.S        Wed Dec 15 12:14:05 2010 +0000
@@ -36,7 +36,8 @@ ENTRY(compat_hypercall)
         pushq UREGS_rbx(%rsp); pushq %rcx; pushq %rdx; pushq %rsi; pushq %rdi
         pushq UREGS_rbp+5*8(%rsp)
         leaq  compat_hypercall_args_table(%rip),%r10
-        movq  $6,%rcx
+        movl  %eax,%eax
+        movl  $6,%ecx
         subb  (%r10,%rax,1),%cl
         movq  %rsp,%rdi
         movl  $0xDEADBEEF,%eax

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