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[Xen-changelog] [xen-unstable] x86/32on64: zero-extend hypercall index b
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| Subject: | [Xen-changelog] [xen-unstable] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only) |
| From: | Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx> |
| Date: | Thu, 23 Dec 2010 05:34:43 -0800 |
| Delivery-date: | Thu, 23 Dec 2010 05:44:05 -0800 |
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# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1292415031 0
# Node ID d8279118b4bbb3bb3689b9c20abb25d0c09e2b69
# Parent 20c65aa19075b1a696adb56325827412596ac0d4
x86/32on64: zero-extend hypercall index before use in memory access (debug mode
only)
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
xen/arch/x86/x86_64/compat/entry.S | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
diff -r 20c65aa19075 -r d8279118b4bb xen/arch/x86/x86_64/compat/entry.S
--- a/xen/arch/x86/x86_64/compat/entry.S Wed Dec 15 12:09:41 2010 +0000
+++ b/xen/arch/x86/x86_64/compat/entry.S Wed Dec 15 12:10:31 2010 +0000
@@ -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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