linux-kernel - Re: [PATCH net-next] tuntap: add sanity checks about msg

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Message-ID: <CAHJXk3aA62C5s-MV-B6mCTuUJGCdc-pEJpEkxX7vBDwDdHaSrw@mail.gmail.com>
Date:   Wed, 2 Mar 2022 11:37:32 +0800
From:   Harold Huang <baymaxhuang@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>, Jason Wang <jasowang@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:VIRTIO HOST (VHOST)" <kvm@...r.kernel.org>,
        "open list:VIRTIO HOST (VHOST)" 
        <virtualization@...ts.linux-foundation.org>,
        "open list:XDP (eXpress Data Path)" <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next] tuntap: add sanity checks about msg_controllen
 in sendmsg

On Wed, Mar 2, 2022 at 10:05 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue,  1 Mar 2022 14:43:14 +0800 Harold Huang wrote:
> > In patch [1], tun_msg_ctl was added to allow pass batched xdp buffers to
> > tun_sendmsg. Although we donot use msg_controllen in this path, we should
> > check msg_controllen to make sure the caller pass a valid msg_ctl.
> >
> > [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fe8dd45bb7556246c6b76277b1ba4296c91c2505
> >
> > Reported-by: Eric Dumazet <eric.dumazet@...il.com>
> > Suggested-by: Jason Wang <jasowang@...hat.com>
> > Signed-off-by: Harold Huang <baymaxhuang@...il.com>
>
> Would you mind resending the same patch? It looks like it depended on
> your other change so the build bot was unable to apply and test it.

Yes, it depends on this patch [1] which has been applied to netdev.  I
see this patch could be applied to netdev by git am. But if I use
another patch that could be applied to linux master, it could not be
applied to netdev anymore.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=fb3f903769e8