netdev - Re: [PATCH net] net: drop bad gso csum_start and offset in virtio_net

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Message-ID: <66c5f41884850_da1e7294d2@willemb.c.googlers.com.notmuch>
Date: Wed, 21 Aug 2024 10:05:12 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Vitaly Chikunov <vt@...linux.org>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: Christian Heusel <christian@...sel.eu>, 
 Adrian Vladu <avladu@...udbasesolutions.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, 
 Greg KH <gregkh@...uxfoundation.org>, 
 "alexander.duyck@...il.com" <alexander.duyck@...il.com>, 
 "arefev@...mel.ru" <arefev@...mel.ru>, 
 "davem@...emloft.net" <davem@...emloft.net>, 
 "edumazet@...gle.com" <edumazet@...gle.com>, 
 "jasowang@...hat.com" <jasowang@...hat.com>, 
 "kuba@...nel.org" <kuba@...nel.org>, 
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>, 
 "pabeni@...hat.com" <pabeni@...hat.com>, 
 "stable@...r.kernel.org" <stable@...r.kernel.org>, 
 "willemb@...gle.com" <willemb@...gle.com>, 
 "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: [PATCH net] net: drop bad gso csum_start and offset in
 virtio_net_hdr

Vitaly Chikunov wrote:
> Willem,
> 
> On Wed, Aug 14, 2024 at 09:53:58AM GMT, Willem de Bruijn wrote:
> > Christian Heusel wrote:
> > > On 24/08/14 10:10AM, Adrian Vladu wrote:
> > > > Hello,
> > > > 
> > > > The 6.6.y branch has the patch already in the stable queue -> https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/commit/?id=3e713b73c01fac163a5c8cb0953d1e300407a773, and it should be available in the 6.6.46 upcoming minor.
> > > > 
> > > > Thanks, Adrian.
> > > 
> > > Yeah it's also queued up for 6.10, which I both missed (sorry for that!).
> > > If I'm able to properly backport the patch for 6.1 I'll send that one,
> > > but my hopes are not too high that this will work ..
> > 
> > There are two conflicts.
> > 
> > The one in include/linux/virtio_net.h is resolved by first backporting
> > commit fc8b2a6194693 ("net: more strict VIRTIO_NET_HDR_GSO_UDP_L4
> > validation")
> > 
> > We did not backport that to stable because there was some slight risk
> > that applications might be affected. This has not surfaced.
> > 
> > The conflict in net/ipv4/udp_offload.c is not so easy to address.
> > There were lots of patches between v6.1 and linus/master, with far
> > fewer of these betwee v6.1 and linux-stable/linux-6.1.y.
> 
> BTW, we successfully cherry-picked 3 suggested[1] commits over v6.1.105 in
> ALT, and there is no reported problems as of yet.
> 
>   89add40066f9 ("net: drop bad gso csum_start and offset in virtio_net_hdr")
>   fc8b2a619469 ("net: more strict VIRTIO_NET_HDR_GSO_UDP_L4 validation")
>   9840036786d9 ("gso: fix dodgy bit handling for GSO_UDP_L4")
> 
> [1] https://lore.kernel.org/all/2024081147-altitude-luminous-19d1@gregkh/

That's good to hear.

These are all fine to go to 6.1 stable.