linux-kernel - Re: [PATCH v3 3/3] kvm: Sanitize KVM

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Message-ID: <1341244179.1207.447.camel@bling.home>
Date:	Mon, 02 Jul 2012 09:49:39 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	avi@...hat.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com, cornelia.huck@...ibm.com
Subject: Re: [PATCH v3 3/3] kvm: Sanitize KVM_IRQFD flags

On Sun, 2012-07-01 at 11:26 +0300, Michael S. Tsirkin wrote:
> On Fri, Jun 29, 2012 at 09:56:24AM -0600, Alex Williamson wrote:
> > We only know of one so far.
> > 
> > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> 
> BTW should we sanitize padding as well?

I imagine that to make use of a field in the padding we'll set a bit in
the flags to indicate that the field is present/valid.  That way we
don't care about garbage in the padding as long as we can sanitize the
flags.  Thanks,

Alex

> > ---
> > 
> >  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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