Messages in this thread | | | Date | Wed, 20 Oct 2021 03:37:31 -0400 | From | "Michael S. Tsirkin" <> | Subject | Re: [PATCH V3 01/10] virtio-blk: validate num_queues during probe |
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On Wed, Oct 20, 2021 at 09:18:17AM +0200, Stefano Garzarella wrote: > On Tue, Oct 19, 2021 at 03:01:43PM +0800, Jason Wang wrote: > > If an untrusted device neogitates BLK_F_MQ but advertises a zero > > s/neogitates/negotiates > > > num_queues, the driver may end up trying to allocating zero size > > buffers where ZERO_SIZE_PTR is returned which may pass the checking > > against the NULL. This will lead unexpected results. > > > > Fixing this by failing the probe in this case. > > > > Cc: Paolo Bonzini <pbonzini@redhat.com> > > Cc: Stefan Hajnoczi <stefanha@redhat.com> > > Cc: Stefano Garzarella <sgarzare@redhat.com> > > Signed-off-by: Jason Wang <jasowang@redhat.com> > > --- > > drivers/block/virtio_blk.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > Should we CC stable? > > Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
No IMO - I don't think we can reasonably expect stable to become protected against attacks on encrypted guests. That's a new feature, not a bugfix.
-- MST
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