On Wed, Jun 27, 2012 at 02:12:18PM -0600, Alex Williamson wrote:
> On Wed, 2012-06-27 at 12:21 +0300, Michael S. Tsirkin wrote:
> > On Tue, Jun 26, 2012 at 11:09:32PM -0600, Alex Williamson wrote:
> > > We only know of one so far.
> > >
> > > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> >
> > Ugh. So we have a bug: we should have sanitized the fields.
> > If there's buggy userspace that only set the low bit
> > it will break with this change.
> > Is it too late now? Do we need KVM_IRQFD2 which
> > sanitized fields properly? Avi?
>
> If we take that attitude that we haven't sanitized the bits in the past
> and therefore all other bits are tainted from future use, we might as
> well toss out this ioctl and start over. There's no way to add
> anything. :-\
This is what I'm asking.
> > > ---
> > >
> > > virt/kvm/eventfd.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> > > index c307c24..7d7e2aa 100644
> > > --- a/virt/kvm/eventfd.c
> > > +++ b/virt/kvm/eventfd.c
> > > @@ -340,6 +340,9 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
> > > int
> > > kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
> > > {
> > > + if (args->flags & ~KVM_IRQFD_FLAG_DEASSIGN)
> > > + return -EINVAL;
> > > +
> > > if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)
> > > return kvm_irqfd_deassign(kvm, args);
> > >
>
>
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