KVM: x86: zero IDT limit on entry to SMM

The recent BlackHat 2015 presentation "The Memory Sinkhole"
mentions that the IDT limit is zeroed on entry to SMM.

This is not documented, and must have changed some time after 2010
(see http://www.ssi.gouv.fr/uploads/IMG/pdf/IT_Defense_2010_final.pdf).
KVM was not doing it, but the fix is easy.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5ef2560075bfb80e6fdabcdf51f71258091e4339..c5e88a88189958220bfdede6841692b8fd146be7 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6327,6 +6327,7 @@ static void process_smi_save_state_64(struct kvm_vcpu *vcpu, char *buf)
 static void process_smi(struct kvm_vcpu *vcpu)
 {
        struct kvm_segment cs, ds;
+       struct desc_ptr dt;
        char buf[512];
        u32 cr0;
 
@@ -6359,6 +6360,10 @@ static void process_smi(struct kvm_vcpu *vcpu)
 
        kvm_x86_ops->set_cr4(vcpu, 0);
 
+       /* Undocumented: IDT limit is set to zero on entry to SMM.  */
+       dt.address = dt.size = 0;
+       kvm_x86_ops->set_idt(vcpu, &dt);
+
        __kvm_set_dr(vcpu, 7, DR7_FIXED_1);
 
        cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;