netdev - [PATCH v2] net/ieee802154: don't warn zero-sized raw

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Message-ID: <c7c086c9-5fb4-22fb-6e61-a5be8d3cfc55@I-love.SAKURA.ne.jp>
Date:   Sun, 2 Oct 2022 12:52:00 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>, linux-wpan@...r.kernel.org
Cc:     syzbot <syzbot+5ea725c25d06fb9114c4@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH v2] net/ieee802154: don't warn zero-sized raw_sendmsg()

syzbot is hitting skb_assert_len() warning at __dev_queue_xmit() [1],
for PF_IEEE802154 socket's zero-sized raw_sendmsg() request is hitting
__dev_queue_xmit() with skb->len == 0.

Since PF_IEEE802154 socket's zero-sized raw_sendmsg() request was
able to return 0, don't call __dev_queue_xmit() if packet length is 0.

  ----------
  #include <sys/socket.h>
  #include <netinet/in.h>

  int main(int argc, char *argv[])
  {
    struct sockaddr_in addr = { .sin_family = AF_INET, .sin_addr.s_addr = htonl(INADDR_LOOPBACK) };
    struct iovec iov = { };
    struct msghdr hdr = { .msg_name = &addr, .msg_namelen = sizeof(addr), .msg_iov = &iov, .msg_iovlen = 1 };
    sendmsg(socket(PF_IEEE802154, SOCK_RAW, 0), &hdr, 0);
    return 0;
  }
  ----------

Note that this might be a sign that commit fd1894224407c484 ("bpf: Don't
redirect packets with invalid pkt_len") should be reverted, for
skb->len == 0 was acceptable for at least PF_IEEE802154 socket.

Link: https://syzkaller.appspot.com/bug?extid=5ea725c25d06fb9114c4 [1]
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>
---
Changes in v2:
  Return 0 after checking -ENXIO case, for a test program shown above
  returns -ENXIO if dev was not found and returns 0 otherwise.

 net/ieee802154/socket.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 7889e1ef7fad..6e55fae4c686 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -272,6 +272,10 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 		err = -EMSGSIZE;
 		goto out_dev;
 	}
+	if (!size) {
+		err = 0;
+		goto out_dev;
+	}
 
 	hlen = LL_RESERVED_SPACE(dev);
 	tlen = dev->needed_tailroom;
-- 
2.34.1