netdev - Re: [PATCH net-next v2 02/13] virtio_ring: split: record extras for indirect buffers

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Message-ID: <20241106024153-mutt-send-email-mst@kernel.org>
Date: Wed, 6 Nov 2024 02:42:30 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, netdev@...r.kernel.org,
	Eugenio Pérez <eperezma@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	virtualization@...ts.linux.dev, bpf@...r.kernel.org
Subject: Re: [PATCH net-next v2 02/13] virtio_ring: split: record extras for
 indirect buffers

On Wed, Nov 06, 2024 at 09:44:39AM +0800, Jason Wang wrote:
> > > >         while (vq->split.vring.desc[i].flags & nextflag) {
> > > > -               vring_unmap_one_split(vq, i);
> > > > +               vring_unmap_one_split(vq, &extra[i]);
> > >
> > > Not sure if I've asked this before. But this part seems to deserve an
> > > independent fix for -stable.
> >
> > What fix?
> 
> I meant for hardening we need to check the flags stored in the extra
> instead of the descriptor itself as it could be mangled by the device.
> 
> Thanks

Good point. Jason, want to cook up a patch?

-- 
MST