Re: [PATCH] KVM: nVMX: Fix size checks in vmx_set_nested_state

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On Wed, Jan 30, 2019 at 11:52 AM Jim Mattson <jmattson@xxxxxxxxxx> wrote:
>
> On Thu, Jan 17, 2019 at 11:56 AM Jim Mattson <jmattson@xxxxxxxxxx> wrote:
> >
> > The size checks in vmx_nested_state are wrong because the calculations
> > are made based on the size of a pointer to a struct kvm_nested_state
> > rather than the size of a struct kvm_nested_state.
> >
> > Reported-by: Felix Wilhelm  <fwilhelm@xxxxxxxxxx>
> > Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
> > Reviewed-by: Drew Schmitt <dasch@xxxxxxxxxx>
> > Reviewed-by: Marc Orr <marcorr@xxxxxxxxxx>
> > Reviewed-by: Peter Shier <pshier@xxxxxxxxxx>
> > ---
> >  arch/x86/kvm/vmx/nested.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > index 2616bd2c7f2c..3bb49ad91d0c 100644
> > --- a/arch/x86/kvm/vmx/nested.c
> > +++ b/arch/x86/kvm/vmx/nested.c
> > @@ -5351,7 +5351,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
> >                 return ret;
> >
> >         /* Empty 'VMXON' state is permitted */
> > -       if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12))
> > +       if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12))
> >                 return 0;
> >
> >         if (kvm_state->vmx.vmcs_pa != -1ull) {
> > @@ -5395,7 +5395,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
> >             vmcs12->vmcs_link_pointer != -1ull) {
> >                 struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);
> >
> > -               if (kvm_state->size < sizeof(kvm_state) + 2 * sizeof(*vmcs12))
> > +               if (kvm_state->size < sizeof(*kvm_state) + 2 * sizeof(*vmcs12))
> >                         return -EINVAL;
> >
> >                 if (copy_from_user(shadow_vmcs12,
> > --
> > 2.20.1.97.g81188d93c3-goog
>
> Ping.

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