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 505FF17B421; Wed, 3 Jul 2024 10:42:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720003326; cv=none; b=Lz7Tl+H9dkIPRL3v0KxI4renZYudtawHJv/evHW56wzZ/O8orvCoa1+jBQqj1aulg0ivTBtSAa7GbF7lRBUiOgj0vMHmViVf54JYCgN1sfy7ipGaEk9bNbTdsGGwRtrUzZQS84jW31i6CDBLtDqwIYnEekUtwUfbkD36Kw4pE00= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720003326; c=relaxed/simple; bh=TKrqwjrNB6IRJW2lCsb0yowVEymfGlVBEUUNWrs2cMk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FZnk0qrKTFkGnDUPnAstCRSyN5eT5N/w7s0VLFiy3HN8BDhQ+W3fu4T7B40OPFC1n4SZEz9bi/tZYAd9rNrQkfEtuxDZelgGlpd5zu2lCeCrOC6TVWe64AKF54A1MgFBjTozRJnlKm8rYRHvCVicx/PLOu7qt6czE1LJyxsTR8o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Aw+4JRho; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Aw+4JRho" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C277C2BD10; Wed, 3 Jul 2024 10:42:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720003325; bh=TKrqwjrNB6IRJW2lCsb0yowVEymfGlVBEUUNWrs2cMk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Aw+4JRho42McF8916kjjYzoHOf9Kga3IFQHB4gdtoCG725j6zHXWfpBh7cz9NBT75 x6ubTGaRjuA4c+JT3DPeICuk8gQhAF+ArT6vIT84RS8jQqE/Wk75FD9b/2FQXBZDDg LnHD/DsaFlo43z6vuPWcYV4Q8bk6tHeEY33zclcQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kuniyuki Iwashima , Paolo Abeni , Sasha Levin Subject: [PATCH 4.19 012/139] af_unix: Annotate data-races around sk->sk_state in UNIX_DIAG. Date: Wed, 3 Jul 2024 12:38:29 +0200 Message-ID: <20240703102830.902885065@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102830.432293640@linuxfoundation.org> References: <20240703102830.432293640@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuniyuki Iwashima [ Upstream commit 0aa3be7b3e1f8f997312cc4705f8165e02806f8f ] While dumping AF_UNIX sockets via UNIX_DIAG, sk->sk_state is read locklessly. Let's use READ_ONCE() there. Note that the result could be inconsistent if the socket is dumped during the state change. This is common for other SOCK_DIAG and similar interfaces. Fixes: c9da99e6475f ("unix_diag: Fixup RQLEN extension report") Fixes: 2aac7a2cb0d9 ("unix_diag: Pending connections IDs NLA") Fixes: 45a96b9be6ec ("unix_diag: Dumping all sockets core") Signed-off-by: Kuniyuki Iwashima Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/unix/diag.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/unix/diag.c b/net/unix/diag.c index d6ceac688defc..f27b4e55da0e8 100644 --- a/net/unix/diag.c +++ b/net/unix/diag.c @@ -61,7 +61,7 @@ static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb) u32 *buf; int i; - if (sk->sk_state == TCP_LISTEN) { + if (READ_ONCE(sk->sk_state) == TCP_LISTEN) { spin_lock(&sk->sk_receive_queue.lock); attr = nla_reserve(nlskb, UNIX_DIAG_ICONS, @@ -99,7 +99,7 @@ static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb) { struct unix_diag_rqlen rql; - if (sk->sk_state == TCP_LISTEN) { + if (READ_ONCE(sk->sk_state) == TCP_LISTEN) { rql.udiag_rqueue = sk->sk_receive_queue.qlen; rql.udiag_wqueue = sk->sk_max_ack_backlog; } else { @@ -124,7 +124,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r rep = nlmsg_data(nlh); rep->udiag_family = AF_UNIX; rep->udiag_type = sk->sk_type; - rep->udiag_state = sk->sk_state; + rep->udiag_state = READ_ONCE(sk->sk_state); rep->pad = 0; rep->udiag_ino = sk_ino; sock_diag_save_cookie(sk, rep->udiag_cookie); @@ -202,7 +202,7 @@ static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) continue; if (num < s_num) goto next; - if (!(req->udiag_states & (1 << sk->sk_state))) + if (!(req->udiag_states & (1 << READ_ONCE(sk->sk_state)))) goto next; if (sk_diag_dump(sk, skb, req, NETLINK_CB(cb->skb).portid, -- 2.43.0