linux-kernel - [PATCH 5.15 091/201] tcp: Fix data-races around sysctl_tcp_syn(ack)?

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Message-Id: <20220727161031.529543535@linuxfoundation.org>
Date:   Wed, 27 Jul 2022 18:09:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kuniyuki Iwashima <kuniyu@...zon.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 091/201] tcp: Fix data-races around sysctl_tcp_syn(ack)?_retries.

From: Kuniyuki Iwashima <kuniyu@...zon.com>

[ Upstream commit 20a3b1c0f603e8c55c3396abd12dfcfb523e4d3c ]

While reading sysctl_tcp_syn(ack)?_retries, they can be changed
concurrently.  Thus, we need to add READ_ONCE() to their readers.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ipv4/inet_connection_sock.c |  3 ++-
 net/ipv4/tcp.c                  |  3 ++-
 net/ipv4/tcp_timer.c            | 10 +++++++---
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index d3bbb344bbe1..a53f9bf7886f 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -829,7 +829,8 @@ static void reqsk_timer_handler(struct timer_list *t)
 
 	icsk = inet_csk(sk_listener);
 	net = sock_net(sk_listener);
-	max_syn_ack_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;
+	max_syn_ack_retries = icsk->icsk_syn_retries ? :
+		READ_ONCE(net->ipv4.sysctl_tcp_synack_retries);
 	/* Normally all the openreqs are young and become mature
 	 * (i.e. converted to established socket) for first timeout.
 	 * If synack was not acknowledged for 1 second, it means
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 4ac53c8f0583..e22a61b2ba82 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3974,7 +3974,8 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 		val = keepalive_probes(tp);
 		break;
 	case TCP_SYNCNT:
-		val = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
+		val = icsk->icsk_syn_retries ? :
+			READ_ONCE(net->ipv4.sysctl_tcp_syn_retries);
 		break;
 	case TCP_LINGER2:
 		val = tp->linger2;
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 4f3b9ab222b6..a234704e8163 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -239,7 +239,8 @@ static int tcp_write_timeout(struct sock *sk)
 	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 		if (icsk->icsk_retransmits)
 			__dst_negative_advice(sk);
-		retry_until = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
+		retry_until = icsk->icsk_syn_retries ? :
+			READ_ONCE(net->ipv4.sysctl_tcp_syn_retries);
 		expired = icsk->icsk_retransmits >= retry_until;
 	} else {
 		if (retransmits_timed_out(sk, net->ipv4.sysctl_tcp_retries1, 0)) {
@@ -406,12 +407,15 @@ abort:		tcp_write_err(sk);
 static void tcp_fastopen_synack_timer(struct sock *sk, struct request_sock *req)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
-	int max_retries = icsk->icsk_syn_retries ? :
-	    sock_net(sk)->ipv4.sysctl_tcp_synack_retries + 1; /* add one more retry for fastopen */
 	struct tcp_sock *tp = tcp_sk(sk);
+	int max_retries;
 
 	req->rsk_ops->syn_ack_timeout(req);
 
+	/* add one more retry for fastopen */
+	max_retries = icsk->icsk_syn_retries ? :
+		READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_synack_retries) + 1;
+
 	if (req->num_timeout >= max_retries) {
 		tcp_write_err(sk);
 		return;
-- 
2.35.1