From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20E63C43334 for ; Tue, 19 Jul 2022 12:06:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238306AbiGSMGW (ORCPT ); Tue, 19 Jul 2022 08:06:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237981AbiGSMEA (ORCPT ); Tue, 19 Jul 2022 08:04:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B72C4BD2C; Tue, 19 Jul 2022 04:59:45 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0264E6163C; Tue, 19 Jul 2022 11:59:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D55B8C341C6; Tue, 19 Jul 2022 11:59:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658231984; bh=5m/azPAvToI2gCQubBnf5EiYpONtrM6AIun8UYrg7eA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MEQugnUtTaf5vxaMhm+RZBWt0lpdWBUiIvbp2uaPsrNzG7IFDOT7yR/QhnQfg5Arm nTlxebqQ4wNcxq0rvWYQ716RE3JKIbdecn5hYQjz6UsZuvaAtc0sTsCsSDHhsSqSMq JWyZDORN+FN5xAtHTHTeBRRBvpmXpenbrqWNEyV8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kuniyuki Iwashima , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 21/48] ipv4: Fix data-races around sysctl_ip_dynaddr. Date: Tue, 19 Jul 2022 13:53:58 +0200 Message-Id: <20220719114521.742897353@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220719114518.915546280@linuxfoundation.org> References: <20220719114518.915546280@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kuniyuki Iwashima [ Upstream commit e49e4aff7ec19b2d0d0957ee30e93dade57dab9e ] While reading sysctl_ip_dynaddr, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- Documentation/networking/ip-sysctl.txt | 2 +- net/ipv4/af_inet.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index ae56957f51e4..e315e6052b9f 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -887,7 +887,7 @@ ip_nonlocal_bind - BOOLEAN which can be quite useful - but may break some applications. Default: 0 -ip_dynaddr - BOOLEAN +ip_dynaddr - INTEGER If set non-zero, enables support for dynamic addresses. If set to a non-zero value larger than 1, a kernel log message will be printed when dynamic address rewriting diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index d8c22246629a..dadd42a07c07 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1209,7 +1209,7 @@ static int inet_sk_reselect_saddr(struct sock *sk) if (new_saddr == old_saddr) return 0; - if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) { + if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) { pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n", __func__, &old_saddr, &new_saddr); } @@ -1264,7 +1264,7 @@ int inet_sk_rebuild_header(struct sock *sk) * Other protocols have to map its equivalent state to TCP_SYN_SENT. * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme */ - if (!sock_net(sk)->ipv4.sysctl_ip_dynaddr || + if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) || sk->sk_state != TCP_SYN_SENT || (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || (err = inet_sk_reselect_saddr(sk)) != 0) -- 2.35.1