From: Jakub Kicinski kuba@kernel.org
[ Upstream commit e34a07c0ae3906f97eb18df50902e2a01c1015b6 ]
Commit 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()") has moved the inet_csk_has_ulp(sk) check from sk_psock_init() to the new tcp_bpf_update_proto() function. I'm guessing that this was done to allow creating psocks for non-inet sockets.
Unfortunately the destruction path for psock includes the ULP unwind, so we need to fail the sk_psock_init() itself. Otherwise if ULP is already present we'll notice that later, and call tcp_update_ulp() with the sk_proto of the ULP itself, which will most likely result in the ULP looping its callbacks.
Fixes: 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()") Signed-off-by: Jakub Kicinski kuba@kernel.org Reviewed-by: John Fastabend john.fastabend@gmail.com Reviewed-by: Jakub Sitnicki jakub@cloudflare.com Tested-by: Jakub Sitnicki jakub@cloudflare.com Link: https://lore.kernel.org/r/20220620191353.1184629-2-kuba@kernel.org Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/inet_sock.h | 5 +++++ net/core/skmsg.c | 5 +++++ net/ipv4/tcp_bpf.c | 3 --- net/tls/tls_main.c | 2 ++ 4 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h index 234d70ae5f4c..48e4c59d85e2 100644 --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -252,6 +252,11 @@ struct inet_sock { #define IP_CMSG_CHECKSUM BIT(7) #define IP_CMSG_RECVFRAGSIZE BIT(8)
+static inline bool sk_is_inet(struct sock *sk) +{ + return sk->sk_family == AF_INET || sk->sk_family == AF_INET6; +} + /** * sk_to_full_sk - Access to a full socket * @sk: pointer to a socket diff --git a/net/core/skmsg.c b/net/core/skmsg.c index cc381165ea08..ede0af308f40 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -695,6 +695,11 @@ struct sk_psock *sk_psock_init(struct sock *sk, int node)
write_lock_bh(&sk->sk_callback_lock);
+ if (sk_is_inet(sk) && inet_csk_has_ulp(sk)) { + psock = ERR_PTR(-EINVAL); + goto out; + } + if (sk->sk_user_data) { psock = ERR_PTR(-EBUSY); goto out; diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c index 1cdcb4df0eb7..2c597a4e429a 100644 --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -612,9 +612,6 @@ int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore) return 0; }
- if (inet_csk_has_ulp(sk)) - return -EINVAL; - if (sk->sk_family == AF_INET6) { if (tcp_bpf_assert_proto_ops(psock->sk_proto)) return -EINVAL; diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c index 7b2b0e7ffee4..5c9697840ef7 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -873,6 +873,8 @@ static void tls_update(struct sock *sk, struct proto *p, { struct tls_context *ctx;
+ WARN_ON_ONCE(sk->sk_prot == p); + ctx = tls_get_ctx(sk); if (likely(ctx)) { ctx->sk_write_space = write_space;