From: "Jan Beulich" <JBeulich@novell.com>
To: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: [PATCH] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only)
Date: Wed, 15 Dec 2010 10:50:09 +0000 [thread overview]
Message-ID: <4D08AB71020000780002813F@vpn.id2.novell.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 523 bytes --]
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- 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
[-- Attachment #2: 32on64-hypercall-debug.patch --]
[-- Type: text/plain, Size: 517 bytes --]
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- 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
[-- Attachment #3: Type: text/plain, Size: 138 bytes --]
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next reply other threads:[~2010-12-15 10:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-15 10:50 Jan Beulich [this message]
2010-12-15 22:21 ` [PATCH] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only) Jeremy Fitzhardinge
2010-12-16 8:04 ` Jan Beulich
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