22 lines
767 B
Diff
22 lines
767 B
Diff
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# HG changeset patch
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# User Keir Fraser <keir@xen.org>
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# Date 1292415031 0
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# Node ID d8279118b4bbb3bb3689b9c20abb25d0c09e2b69
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# Parent 20c65aa19075b1a696adb56325827412596ac0d4
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x86/32on64: zero-extend hypercall index before use in memory access (debug mode only)
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Signed-off-by: Jan Beulich <jbeulich@novell.com>
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--- a/xen/arch/x86/x86_64/compat/entry.S
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+++ b/xen/arch/x86/x86_64/compat/entry.S
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@@ -36,7 +36,8 @@ ENTRY(compat_hypercall)
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pushq UREGS_rbx(%rsp); pushq %rcx; pushq %rdx; pushq %rsi; pushq %rdi
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pushq UREGS_rbp+5*8(%rsp)
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leaq compat_hypercall_args_table(%rip),%r10
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- movq $6,%rcx
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+ movl %eax,%eax
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+ movl $6,%ecx
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subb (%r10,%rax,1),%cl
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movq %rsp,%rdi
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movl $0xDEADBEEF,%eax
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