From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C79F82DF9A for ; Tue, 7 Nov 2023 12:13:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CDGq/55Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47469C433C8; Tue, 7 Nov 2023 12:13:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699359228; bh=AUl7jYydCqr3LoSvgRlVv9TK/v/85hEFIr2yHKUBj9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CDGq/55ZriKV5zzP+pijmQ1HgneGkRw+Jj/y/YnSx7GnWGFyw4fi7c2mDKc/vmys7 bAOS30Aray+sO2u+8KufkerrFetL+RbNnEUkH78h2R6i43ylnmEgTlWFYGaYH/enl0 Z2kJ39ZlBf73eyUT06PU/voAxM/M4IM+ekApmvhT+Ad76fdhjiHV+Mc9xKCdl3Wsml zf2gowGUV3mRdregrj0qqYG+adl+0bYLYU/zVqfZRuPpVs7ubZRcyglS5oQsl2xXvW PI5twBlxeCcQ89/qC7+nXcPMKsoYeIAdUNVg46AgpAFYcGcJQZbsVnvWhuXXZNeTPq Wn1Y3Br95EXjw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Eric Dumazet , "David S . Miller" , Sasha Levin , kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, kuniyu@amazon.com, wuyun.abel@bytedance.com, leitao@debian.org, alexander@mihalicyn.com, dhowells@redhat.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 4/4] net: annotate data-races around sk->sk_dst_pending_confirm Date: Tue, 7 Nov 2023 07:13:34 -0500 Message-ID: <20231107121337.3759240-4-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107121337.3759240-1-sashal@kernel.org> References: <20231107121337.3759240-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 4.14.328 Content-Transfer-Encoding: 8bit From: Eric Dumazet [ Upstream commit eb44ad4e635132754bfbcb18103f1dcb7058aedd ] This field can be read or written without socket lock being held. Add annotations to avoid load-store tearing. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- include/net/sock.h | 6 +++--- net/core/sock.c | 2 +- net/ipv4/tcp_output.c | 2 +- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 7b42ddca4decb..f974b548e1199 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1804,7 +1804,7 @@ static inline void dst_negative_advice(struct sock *sk) if (ndst != dst) { rcu_assign_pointer(sk->sk_dst_cache, ndst); sk_tx_queue_clear(sk); - sk->sk_dst_pending_confirm = 0; + WRITE_ONCE(sk->sk_dst_pending_confirm, 0); } } } @@ -1815,7 +1815,7 @@ __sk_dst_set(struct sock *sk, struct dst_entry *dst) struct dst_entry *old_dst; sk_tx_queue_clear(sk); - sk->sk_dst_pending_confirm = 0; + WRITE_ONCE(sk->sk_dst_pending_confirm, 0); old_dst = rcu_dereference_protected(sk->sk_dst_cache, lockdep_sock_is_held(sk)); rcu_assign_pointer(sk->sk_dst_cache, dst); @@ -1828,7 +1828,7 @@ sk_dst_set(struct sock *sk, struct dst_entry *dst) struct dst_entry *old_dst; sk_tx_queue_clear(sk); - sk->sk_dst_pending_confirm = 0; + WRITE_ONCE(sk->sk_dst_pending_confirm, 0); old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); dst_release(old_dst); } diff --git a/net/core/sock.c b/net/core/sock.c index 5b9f51a27dc0d..e8b5742d91492 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -534,7 +534,7 @@ struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { sk_tx_queue_clear(sk); - sk->sk_dst_pending_confirm = 0; + WRITE_ONCE(sk->sk_dst_pending_confirm, 0); RCU_INIT_POINTER(sk->sk_dst_cache, NULL); dst_release(dst); return NULL; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 8b2d49120ce23..67636017f275a 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1059,7 +1059,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, skb_set_hash_from_sk(skb, sk); refcount_add(skb->truesize, &sk->sk_wmem_alloc); - skb_set_dst_pending_confirm(skb, sk->sk_dst_pending_confirm); + skb_set_dst_pending_confirm(skb, READ_ONCE(sk->sk_dst_pending_confirm)); /* Build TCP header and checksum it. */ th = (struct tcphdr *)skb->data; -- 2.42.0