[Xen-changelog] [xen stable-4.3] VMX: values written to MSR_IA32_SYSENTER_E[IS]P should be canonical

[patchbot@xxxxxxx]

commit d6f9aadf2177f4ec32cefd30343cdfcca4bfc8fa
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Nov 13 09:58:11 2014 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 13 09:58:11 2014 +0100

    VMX: values written to MSR_IA32_SYSENTER_E[IS]P should be canonical
    
    A recent KVM change by Nadav Amit <namit@xxxxxxxxxxxxxxxxx> helped spot
    that we have the same issue as they did.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Tim Deegan <tim@xxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    master commit: 93cc5c6f1641e90eb120826d42f103b7726efb8e
    master date: 2014-10-31 11:31:11 +0100
---
 xen/arch/x86/hvm/vmx/vmx.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 7a2f052..9c5ec60 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2146,9 +2146,13 @@ static int vmx_msr_write_intercept(unsigned int msr, 
uint64_t msr_content)
         __vmwrite(GUEST_SYSENTER_CS, msr_content);
         break;
     case MSR_IA32_SYSENTER_ESP:
+        if ( !is_canonical_address(msr_content) )
+            goto gp_fault;
         __vmwrite(GUEST_SYSENTER_ESP, msr_content);
         break;
     case MSR_IA32_SYSENTER_EIP:
+        if ( !is_canonical_address(msr_content) )
+            goto gp_fault;
         __vmwrite(GUEST_SYSENTER_EIP, msr_content);
         break;
     case MSR_IA32_DEBUGCTLMSR: {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.3

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