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From: linke li <lilinke99@qq.com>
To: 
Cc: lilinke99@qq.com,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,
	Kuniyuki Iwashima <kuniyu@amazon.com>,
	Willem de Bruijn <willemb@google.com>,
	Abel Wu <wuyun.abel@bytedance.com>,
	Breno Leitao <leitao@debian.org>,
	Alexander Mikhalitsyn <alexander@mihalicyn.com>,
	David Howells <dhowells@redhat.com>,
	netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] net: mark racy access on sk->sk_rcvbuf
Date: Sat,  9 Mar 2024 21:34:40 +0800
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

sk->sk_rcvbuf can be changed by other threads. Mark this as benign using
READ_ONCE. 

This patch is aimed at reducing the number of benign races reported by
KCSAN in order to focus future debugging effort on harmful races.

Signed-off-by: linke li <lilinke99@qq.com>
---
 net/core/sock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 5e78798456fd..4c5524e70534 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -551,7 +551,7 @@ int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
 
 	skb->dev = NULL;
 
-	if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
+	if (sk_rcvqueues_full(sk, READ_ONCE(sk->sk_rcvbuf))) {
 		atomic_inc(&sk->sk_drops);
 		goto discard_and_relse;
 	}
-- 
2.39.3 (Apple Git-146)