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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Davide Caratti , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, "Matthieu Baerts (NGI0)" , stable@vger.kernel.org, Boris Pismenny , John Fastabend X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=3080; i=matttbe@kernel.org; h=from:subject:message-id; bh=xtj9AwzwqPCqP5Friqh0vCOkOhD544GhNiZf9ekwIjU=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBlzlcc3yITjm+xGd3bhfD6bwGDlnT5JnEpdqxGj PhywDxO5umJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZc5XHAAKCRD2t4JPQmmg c56hD/4jXp5hKXebFuJVEHHOfdxqoyu+ghz9oB7ej8NcNVkhVR71JwrdGzHhiOtZ5VHdCcioCrT snpg2EkpSCaNk0rj3FWP622w2st+18qVuicEQ4KM77Dl8lxFeQRgYWWWXuHanuH7YSsYl0lKudW T4IsCOgKJybSYMTlXxR8MgOVOPeVaEXG5qYmHDxB4itbeVbJoU9Py2PEl9N5h+3KrMqlqNzTxYW DHR3ZeBjz+6J4/OrxL1xUnK6KovOqZ8IEJIb/lFRicruFZcx5P41qyylcFfp7OKYEvw1t5UaopQ FlnPJvkZZVDeNXEhNf1SEsXGUG/MIReDU3MhToj5sHrw0npRicV+H2QazESpa3jgrR2z0GtemRi dTgN8ZZ6b1BrUik+FCLDPCdcbj7RQvzUalUkIktJAyUKoOhnlJWsYhz/Mt04Xi4BhH2hOGTTdTZ vjVdh/1Rr8OorQA7zSglQosfdtuXTrzd4+cQD2SuhrYPkMJy2iepEfgCZzBZlc30MeXRAd6g+8p X2i18RDY34ZT/GmHA/rsq1FswcULdaIjcf4jy8ibt946SIMff923FweP4OjYp24dFH2IgMbJve4 GG8j+/vDfkYKf8oRPj+cEESKJFmWE5zGEAs0n90PevE0DIaHcAn11CZxEKdl1ic1062ABiwho1z YbJXY9Lv8sojGlQ== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790992448683837542 X-GMAIL-MSGID: 1790992448683837542 From: Paolo Abeni Since the introduction of the subflow ULP diag interface, the dump callback accessed all the subflow data with lockless. We need either to annotate all the read and write operation accordingly, or acquire the subflow socket lock. Let's do latter, even if slower, to avoid a diffstat havoc. Fixes: 5147dfb50832 ("mptcp: allow dumping subflow context to userspace") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- Notes: - This patch modifies the existing ULP API. No better solutions have been found for -net, and there is some similar prior art, see commit 0df48c26d841 ("tcp: add tcpi_bytes_acked to tcp_info"). Please also note that TLS ULP Diag has likely the same issue. To: Boris Pismenny To: John Fastabend --- include/net/tcp.h | 2 +- net/mptcp/diag.c | 6 +++++- net/tls/tls_main.c | 2 +- 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index dd78a1181031..f6eba9652d01 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2506,7 +2506,7 @@ struct tcp_ulp_ops { /* cleanup ulp */ void (*release)(struct sock *sk); /* diagnostic */ - int (*get_info)(const struct sock *sk, struct sk_buff *skb); + int (*get_info)(struct sock *sk, struct sk_buff *skb); size_t (*get_info_size)(const struct sock *sk); /* clone ulp */ void (*clone)(const struct request_sock *req, struct sock *newsk, diff --git a/net/mptcp/diag.c b/net/mptcp/diag.c index a536586742f2..e57c5f47f035 100644 --- a/net/mptcp/diag.c +++ b/net/mptcp/diag.c @@ -13,17 +13,19 @@ #include #include "protocol.h" -static int subflow_get_info(const struct sock *sk, struct sk_buff *skb) +static int subflow_get_info(struct sock *sk, struct sk_buff *skb) { struct mptcp_subflow_context *sf; struct nlattr *start; u32 flags = 0; + bool slow; int err; start = nla_nest_start_noflag(skb, INET_ULP_INFO_MPTCP); if (!start) return -EMSGSIZE; + slow = lock_sock_fast(sk); rcu_read_lock(); sf = rcu_dereference(inet_csk(sk)->icsk_ulp_data); if (!sf) { @@ -69,11 +71,13 @@ static int subflow_get_info(const struct sock *sk, struct sk_buff *skb) } rcu_read_unlock(); + unlock_sock_fast(sk, slow); nla_nest_end(skb, start); return 0; nla_failure: rcu_read_unlock(); + unlock_sock_fast(sk, slow); nla_nest_cancel(skb, start); return err; } diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c index 1c2c6800949d..b4674f03d71a 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -1003,7 +1003,7 @@ static u16 tls_user_config(struct tls_context *ctx, bool tx) return 0; } -static int tls_get_info(const struct sock *sk, struct sk_buff *skb) +static int tls_get_info(struct sock *sk, struct sk_buff *skb) { u16 version, cipher_type; struct tls_context *ctx;