Message-ID: <CAK-6q+iqPFxrM7qdmi4xcF8e+2mgqXT9otEwRA+Vh-JfRQ18Wg@mail.gmail.com>
Date:   Tue, 4 Oct 2022 21:49:02 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Stefan Schmidt <stefan@...enfreihafen.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        patchwork-bot+netdevbpf@...nel.org,
        "David S. Miller" <davem@...emloft.net>, alex.aring@...il.com,
        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 Tue, Oct 4, 2022 at 1:59 PM Stefan Schmidt <stefan@...enfreihafen.org> wrote:
>
> Hello.
>
> On 04.10.22 00:29, Alexander Aring wrote:
> > 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.
>
> This will only work once I merged net into wpan. Which I normally do
> only after a pull request to avoid merge requests being created.
>

ok.

> We have two options here a) reverting this patch and applying v2 of it
> b) Tetsu sending an incremental patch on top of the applied one to come
> to the same state as after v2.
>
>
> Then it should be fixed in the next

ok.

> > pull request to net. For netdev maintainers, please don't apply wpan
> > patches. Stefan and I will care about it.
>
> Keep in mind that Dave and Jakub do this to help us out because we are
> sometimes slow on applying patches and getting them to net. Normally
> this is all fine for clear fixes.
>

If we move getting patches for wpan to net then we should move it
completely to that behaviour and not having a mixed setup which does
not work, or it works and hope we don't have conflicts and if we have
conflicts we need to fix them when doing the pull-request that the
next instance has no conflicts because they touched maybe the same
code area.

> For -next material I agree this should only go through the wpan-next
> tree for us to coordinate, but for the occasional fix its often faster
> if it hits net directly. Normally I don't mind that. In this case v2 was
> overlooked. But this is easily rectified with either of the two options
> mentioned above.
>

I think a) would be the fastest way here and I just sent something.

- Alex

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