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bpf: Sockmap/tls, push write_space updates through ulp updates

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When sockmap sock with TLS enabled is removed we cleanup bpf/psock state
and call tcp_update_ulp() to push updates to TLS ULP on top. However, we
don't push the write_space callback up and instead simply overwrite the
op with the psock stored previous op. This may or may not be correct so
to ensure we don't overwrite the TLS write space hook pass this field to
the ULP and have it fixup the ctx.

This completes a previous fix that pushed the ops through to the ULP
but at the time missed doing this for write_space, presumably because
write_space TLS hook was added around the same time.

Fixes: 95fa145479 ("bpf: sockmap/tls, close can race with map free")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/bpf/20200111061206.8028-4-john.fastabend@gmail.com
This commit is contained in:
John Fastabend 2020-01-11 06:12:01 +00:00 • committed by Daniel Borkmann
parent 7e81a35302
commit 33bfe20dd7
4 changed files with 23 additions and 11 deletions
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12
include/linux/skmsg.h
View file

@ -359,17 +359,21 @@ static inline void sk_psock_restore_proto(struct sock *sk,
struct sk_psock *psock)
{
sk->sk_prot->unhash = psock->saved_unhash;
sk->sk_write_space = psock->saved_write_space;
if (psock->sk_proto) {
struct inet_connection_sock *icsk = inet_csk(sk);
bool has_ulp = !!icsk->icsk_ulp_data;
if (has_ulp)
tcp_update_ulp(sk, psock->sk_proto);
else
if (has_ulp) {
tcp_update_ulp(sk, psock->sk_proto,
psock->saved_write_space);
} else {
sk->sk_prot = psock->sk_proto;
sk->sk_write_space = psock->saved_write_space;
}
psock->sk_proto = NULL;
} else {
sk->sk_write_space = psock->saved_write_space;
}
}