netdev - Re: [PATCH] net/ieee802154: reject zero-sized raw

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Date:   Mon, 3 Oct 2022 18:29:02 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     patchwork-bot+netdevbpf@...nel.org,
        "David S. Miller" <davem@...emloft.net>, alex.aring@...il.com,
        stefan@...enfreihafen.org, shaozhengchao@...wei.com,
        ast@...nel.org, sdf@...gle.com, linux-wpan@...r.kernel.org,
        syzbot+5ea725c25d06fb9114c4@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net/ieee802154: reject zero-sized raw_sendmsg()

Hi,

On Mon, Oct 3, 2022 at 8:35 AM Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:
>
> On 2022/10/03 21:30, patchwork-bot+netdevbpf@...nel.org wrote:
> > Hello:
> >
> > This patch was applied to netdev/net.git (master)
> > by David S. Miller <davem@...emloft.net>:
> >
> > On Sun, 2 Oct 2022 01:43:44 +0900 you wrote:
> >> syzbot is hitting skb_assert_len() warning at raw_sendmsg() for ieee802154
> >> socket. What commit dc633700f00f726e ("net/af_packet: check len when
> >> min_header_len equals to 0") does also applies to ieee802154 socket.
> >>
> >> Link: https://syzkaller.appspot.com/bug?extid=5ea725c25d06fb9114c4
> >> Reported-by: syzbot <syzbot+5ea725c25d06fb9114c4@...kaller.appspotmail.com>
> >> Fixes: fd1894224407c484 ("bpf: Don't redirect packets with invalid pkt_len")
> >> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> >>
> >> [...]
> >
> > Here is the summary with links:
> >   - net/ieee802154: reject zero-sized raw_sendmsg()
> >     https://git.kernel.org/netdev/net/c/3a4d061c699b
>
>
> Are you sure that returning -EINVAL is OK?
>
> In v2 patch, I changed to return 0, for PF_IEEE802154 socket's zero-sized
> raw_sendmsg() request was able to return 0.

I currently try to get access to kernel.org wpan repositories and try
to rebase/apply your v2 on it. Then it should be fixed in the next
pull request to net. For netdev maintainers, please don't apply wpan
patches. Stefan and I will care about it.

Thanks.

- Alex