diff options
| author | Cong Wang <cong.wang@bytedance.com> | 2021-05-05 12:40:48 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-05-05 12:52:45 -0700 |
| commit | 8621436671f3a4bba5db57482e1ee604708bf1eb (patch) | |
| tree | 5a5dafac72732103c5eb548fc4a01242e40c70b3 | |
| parent | 2c16db6c92b0ee4aa61e88366df82169e83c3f7e (diff) | |
smc: disallow TCP_ULP in smc_setsockopt()
syzbot is able to setup kTLS on an SMC socket which coincidentally
uses sk_user_data too. Later, kTLS treats it as psock so triggers a
refcnt warning. The root cause is that smc_setsockopt() simply calls
TCP setsockopt() which includes TCP_ULP. I do not think it makes
sense to setup kTLS on top of SMC sockets, so we should just disallow
this setup.
It is hard to find a commit to blame, but we can apply this patch
since the beginning of TCP_ULP.
Reported-and-tested-by: syzbot+b54a1ce86ba4a623b7f0@syzkaller.appspotmail.com
Fixes: 734942cc4ea6 ("tcp: ULP infrastructure")
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/smc/af_smc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index be3e80b3e27f..5eff7cccceff 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -2161,6 +2161,9 @@ static int smc_setsockopt(struct socket *sock, int level, int optname, struct smc_sock *smc; int val, rc; + if (level == SOL_TCP && optname == TCP_ULP) + return -EOPNOTSUPP; + smc = smc_sk(sk); /* generic setsockopts reaching us here always apply to the @@ -2185,7 +2188,6 @@ static int smc_setsockopt(struct socket *sock, int level, int optname, if (rc || smc->use_fallback) goto out; switch (optname) { - case TCP_ULP: case TCP_FASTOPEN: case TCP_FASTOPEN_CONNECT: case TCP_FASTOPEN_KEY: |