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KVM: VMX: Don't allow uninhibited access to EFER on i386 

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>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2009-03-23 22:13:44 +02:00
parent bc7a8660df
commit 16175a796d
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/vmx.c
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@ -936,11 +936,11 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
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;