From patchwork Mon Dec 12 13:08:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Harshit Mogalapalli X-Patchwork-Id: 633298 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 7E813C4332F for ; Mon, 12 Dec 2022 13:09:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232496AbiLLNJM (ORCPT ); Mon, 12 Dec 2022 08:09:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38032 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232174AbiLLNJC (ORCPT ); Mon, 12 Dec 2022 08:09:02 -0500 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39FC21276B; Mon, 12 Dec 2022 05:09:00 -0800 (PST) Received: from pps.filterd (m0246629.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2BC98JdN023527; Mon, 12 Dec 2022 13:08:41 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=corp-2022-7-12; bh=dxskmic1Yr1+fUcs56ZWXNvxVz9bJt1msmiC1km1d2I=; b=Y9n3VwiQoek16COca9Z+xE4V8FWJX8daNOYz4pjVgqQQ9qcBJ2xsMeJYoUCSZCTZjKHU tYoNKUmjwvBCQyiW7opAqPCp8gKhnYttjrXcVvwLRt8LZEM0ehjNnJfBdzJeeUtI0vzn hw+0B7FOGATOi1YmVHf/4PVVrf1EGvMmDoFSmdMfx/AwzDxXQUfs35zkseoUrw6XPo+c omtjBfW8V6Pf9zeIMwcb2kVNy6qSOCu0E1PRQm7ru47JAm5ErxFqg5XL9QM//hGOxgmB DgtVZrNs76gTyIUwZPhT7E6lNnMAmiOkR9BoCNmO/hjnjIJ+GrdBBJiWtsoI1dTon6t/ Lg== Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.appoci.oracle.com [138.1.37.129]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3mcj092n3v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 12 Dec 2022 13:08:40 +0000 Received: from pps.filterd (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.5/8.17.1.5) with ESMTP id 2BCBvkII034709; Mon, 12 Dec 2022 13:08:40 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3mcgj40sj5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 12 Dec 2022 13:08:40 +0000 Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 2BCD8dRO038889; Mon, 12 Dec 2022 13:08:39 GMT Received: from ca-dev112.us.oracle.com (ca-dev112.us.oracle.com [10.129.136.47]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 3mcgj40shq-1; Mon, 12 Dec 2022 13:08:39 +0000 From: Harshit Mogalapalli Cc: harshit.m.mogalapalli@oracle.com, harshit.m.mogalapalli@gmail.com, error27@gmail.com, darren.kenny@oracle.com, Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Brian Gix , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Bluetooth: Fix a buffer overflow in mgmt_mesh_add() Date: Mon, 12 Dec 2022 05:08:28 -0800 Message-Id: <20221212130828.988528-1-harshit.m.mogalapalli@oracle.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-12_02,2022-12-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 mlxscore=0 adultscore=0 malwarescore=0 spamscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212120122 X-Proofpoint-ORIG-GUID: e01joMMkITDIIWfYrGbDlKhSpFsgVQH1 X-Proofpoint-GUID: e01joMMkITDIIWfYrGbDlKhSpFsgVQH1 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Smatch Warning: net/bluetooth/mgmt_util.c:375 mgmt_mesh_add() error: __memcpy() 'mesh_tx->param' too small (48 vs 50) Analysis: 'mesh_tx->param' is array of size 48. This is the destination. u8 param[sizeof(struct mgmt_cp_mesh_send) + 29]; // 19 + 29 = 48. But in the caller 'mesh_send' we reject only when len > 50. len > (MGMT_MESH_SEND_SIZE + 31) // 19 + 31 = 50. Fixes: b338d91703fa ("Bluetooth: Implement support for Mesh") Signed-off-by: Harshit Mogalapalli --- This is based on static analysis, I am unsure if we should put an upper bound to len(48) instead. This limit on length changed between v4 and v5 patches of Commit: ("Bluetooth: Implement support for Mesh") in function mesh_send() v4: https://lore.kernel.org/all/20220511155412.740249-2-brian.gix@intel.com/ v5: https://lore.kernel.org/all/20220720194511.320773-2-brian.gix@intel.com/ --- net/bluetooth/mgmt_util.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bluetooth/mgmt_util.h b/net/bluetooth/mgmt_util.h index 6a8b7e84293d..bdf978605d5a 100644 --- a/net/bluetooth/mgmt_util.h +++ b/net/bluetooth/mgmt_util.h @@ -27,7 +27,7 @@ struct mgmt_mesh_tx { struct sock *sk; u8 handle; u8 instance; - u8 param[sizeof(struct mgmt_cp_mesh_send) + 29]; + u8 param[sizeof(struct mgmt_cp_mesh_send) + 31]; }; struct mgmt_pending_cmd {