bpf: Fix use of sk->sk_reuseport from sk_assign
In testing, we found that for request sockets the sk->sk_reuseport field
may yet be uninitialized, which caused bpf_sk_assign() to randomly
succeed or return -ESOCKTNOSUPPORT when handling the forward ACK in a
three-way handshake.
Fix it by only applying the reuseport check for full sockets.
Fixes: cf7fbe660f
("bpf: Add socket assign support")
Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200408033540.10339-1-joe@wand.net.nz
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@ -5925,7 +5925,7 @@ BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
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return -EOPNOTSUPP;
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return -EOPNOTSUPP;
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if (unlikely(dev_net(skb->dev) != sock_net(sk)))
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if (unlikely(dev_net(skb->dev) != sock_net(sk)))
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return -ENETUNREACH;
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return -ENETUNREACH;
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if (unlikely(sk->sk_reuseport))
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if (unlikely(sk_fullsock(sk) && sk->sk_reuseport))
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return -ESOCKTNOSUPPORT;
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return -ESOCKTNOSUPPORT;
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if (sk_is_refcounted(sk) &&
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if (sk_is_refcounted(sk) &&
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unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
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unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
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