Messages in this thread Patch in this message | | | Date | Fri, 04 Sep 2009 13:07:35 -0700 | From | Greg KH <> | Subject | [patch 23/48] KVM: VMX: Dont allow uninhibited access to EFER on i386 |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
------------------ From: Avi Kivity <avi@redhat.com>
(cherry picked from commit 16175a796d061833aacfbd9672235f2d2725df65)
vmx_set_msr() does not allow i386 guests to touch EFER, but they can still do so through the default: label in the switch. If they set EFER_LME, they can oops the host.
Fix by having EFER access through the normal channel (which will check for EFER_LME) even on i386.
Reported-and-tested-by: Benjamin Gilbert <bgilbert@cs.cmu.edu> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- arch/x86/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -898,11 +898,11 @@ static int vmx_set_msr(struct kvm_vcpu * int ret = 0; switch (msr_index) { -#ifdef CONFIG_X86_64 case MSR_EFER: vmx_load_host_state(vmx); ret = kvm_set_msr_common(vcpu, msr_index, data); break; +#ifdef CONFIG_X86_64 case MSR_FS_BASE: vmcs_writel(GUEST_FS_BASE, data); break;
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