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[Xen-devel] [PATCH] x86/32on64: zero-extend hypercall index before use i
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only) |
| From: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
| Date: | Wed, 15 Dec 2010 10:50:09 +0000 |
| Delivery-date: | Wed, 15 Dec 2010 02:53:17 -0800 |
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Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -25,7 +25,8 @@ 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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