From nobody Tue Sep 9 07:50:07 2025 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 5A6B0C0015E for ; Tue, 25 Jul 2023 02:22:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229705AbjGYCWb (ORCPT ); Mon, 24 Jul 2023 22:22:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229452AbjGYCW3 (ORCPT ); Mon, 24 Jul 2023 22:22:29 -0400 Received: from azure-sdnproxy.icoremail.net (azure-sdnproxy.icoremail.net [207.46.229.174]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BF068CD; Mon, 24 Jul 2023 19:22:25 -0700 (PDT) Received: from localhost.localdomain (unknown [39.174.92.167]) by mail-app3 (Coremail) with SMTP id cC_KCgA3HbzAMb9kOIKkCw--.4468S4; Tue, 25 Jul 2023 10:21:53 +0800 (CST) From: Lin Ma To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, razor@blackwall.org, idosch@nvidia.com, lucien.xin@gmail.com, liuhangbin@gmail.com, edwin.peer@broadcom.com, jiri@resnulli.us, md.fahad.iqbal.polash@intel.com, anirudh.venkataramanan@intel.com, jeffrey.t.kirsher@intel.com, neerav.parikh@intel.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Lin Ma Subject: [PATCH v1] rtnetlink: let rtnl_bridge_setlink checks IFLA_BRIDGE_MODE length Date: Tue, 25 Jul 2023 10:21:51 +0800 Message-Id: <20230725022151.417450-1-linma@zju.edu.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: cC_KCgA3HbzAMb9kOIKkCw--.4468S4 X-Coremail-Antispam: 1UD129KBjvJXoW7Zr4rAw15KF4Dtr45WrWkXrb_yoW8XF4xpa 4rKa4xJF1DXr97Za17AFyrX3s7ZFZIgrW5Wr42ywn2yF9YqFyUCr98CFn0vry3AFsIqa43 tr17Gr1avr1DGFDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkE14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4U JVW0owA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628v n2kIc2xKxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F4 0E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_GFv_Wryl IxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxV AFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j 6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUQvt AUUUUU= X-CM-SenderInfo: qtrwiiyqvtljo62m3hxhgxhubq/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" There are totally 9 ndo_bridge_setlink handlers in the current kernel, which are 1) bnxt_bridge_setlink, 2) be_ndo_bridge_setlink 3) i40e_ndo_bridge_setlink 4) ice_bridge_setlink 5) ixgbe_ndo_bridge_setlink 6) mlx5e_bridge_setlink 7) nfp_net_bridge_setlink 8) qeth_l2_bridge_setlink 9) br_setlink. By investigating the code, we find that 1-7 parse and use nlattr IFLA_BRIDGE_MODE but 3 and 4 forget to do the nla_len check. This can lead to an out-of-attribute read and allow a malformed nlattr (e.g., length 0) to be viewed as a 2 byte integer. To avoid such issues, also for other ndo_bridge_setlink handlers in the future. This patch adds the nla_len check in rtnl_bridge_setlink and does an early error return if length mismatches. Fixes: b1edc14a3fbf ("ice: Implement ice_bridge_getlink and ice_bridge_setl= ink") Fixes: 51616018dd1b ("i40e: Add support for getlink, setlink ndo ops") Suggested-by: Jakub Kicinski Signed-off-by: Lin Ma --- net/core/rtnetlink.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 3ad4e030846d..1e51291007ea 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -5148,6 +5148,11 @@ static int rtnl_bridge_setlink(struct sk_buff *skb, = struct nlmsghdr *nlh, flags =3D nla_get_u16(attr); break; } + + if (nla_type(attr) =3D=3D IFLA_BRIDGE_MODE) { + if (nla_len(attr) < sizeof(u16)) + return -EINVAL; + } } } =20 --=20 2.17.1