linux-kernel - Re: [PATCH V3 01/10] virtio-blk: validate num

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Message-ID: <20211020032849-mutt-send-email-mst@kernel.org>
Date:   Wed, 20 Oct 2021 03:37:31 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Stefano Garzarella <sgarzare@...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 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.

-- 
MST