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Date: Wed, 20 Oct 2021 10:44:05 +0200 From: Stefano Garzarella <sgarzare@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: Jason Wang <jasowang@...hat.com>, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, f.hetzelt@...berlin.de, david.kaplan@....com, konrad.wilk@...cle.com, Paolo Bonzini <pbonzini@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com> Subject: Re: [PATCH V3 01/10] virtio-blk: validate num_queues during probe On Wed, Oct 20, 2021 at 03:37:31AM -0400, Michael S. Tsirkin wrote: >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@...hat.com> >> > Cc: Stefan Hajnoczi <stefanha@...hat.com> >> > Cc: Stefano Garzarella <sgarzare@...hat.com> >> > Signed-off-by: Jason Wang <jasowang@...hat.com> >> > --- >> > drivers/block/virtio_blk.c | 4 ++++ >> > 1 file changed, 4 insertions(+) >> >> Should we CC stable? >> >> Reviewed-by: Stefano Garzarella <sgarzare@...hat.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. Yep, make sense. I had only seen the single patch, not the entire series, and it seemed like a fix. Viewed as a whole, it makes sense to consider it a new feature to improve audits in the guest. Thanks, Stefano
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