From patchwork Wed Dec 6 16:18:28 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Haakon Bugge X-Patchwork-Id: 10096443 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C7C9360329 for ; Wed, 6 Dec 2017 16:19:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B7C3328BD7 for ; Wed, 6 Dec 2017 16:19:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A9E2A291FF; Wed, 6 Dec 2017 16:19:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 472D528BD7 for ; Wed, 6 Dec 2017 16:19:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752320AbdLFQTN (ORCPT ); Wed, 6 Dec 2017 11:19:13 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:55692 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751604AbdLFQTH (ORCPT ); Wed, 6 Dec 2017 11:19:07 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.21/8.16.0.21) with SMTP id vB6G7UkZ077819; Wed, 6 Dec 2017 16:19:03 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-type : content-transfer-encoding; s=corp-2017-10-26; bh=aKVoeKVCc72OHEbs/R1Wt4COMy9WpXMtIBvXlkBPMmU=; b=Pj5l+wHFlBqIFvdQ1Yyg+vCKgno568VFxrjsJJ1JEbmX1Vy/jlGC+hjrhd2dF6voJ7Xk 3LPG1aO7SfFwVA1ArZDnokJ4XruEQqTQOgpnIudAD+U2kkztOVpaRdHfgfMUbuwCF1rq YYaBH+sQs/CzEs5H4L/rr3++JNre5a8MWT/GsvnQG6sEGNXX11PP5aFwuBBDqZVTcNoV XB4GU8MKCa2d/C5aeqSayyMWgMRC15RrexY3hGxW3HqDAmXrtdmXgmLLGTdDCEqOYAPR K7MXdgxuMDWW03ZvWUlEaMtuQJGSS9Z+oz+P7EBury2UDRur96m5pMVeIs2i1EWXr1C6 CQ== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp2120.oracle.com with ESMTP id 2epd12hqr1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 06 Dec 2017 16:19:03 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id vB6GJ2aq012457 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 6 Dec 2017 16:19:02 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id vB6GJ1Nn006669; Wed, 6 Dec 2017 16:19:01 GMT Received: from lab02.no.oracle.com (/10.172.144.56) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 Dec 2017 08:19:01 -0800 From: =?UTF-8?q?H=C3=A5kon=20Bugge?= To: Santosh Shilimkar , "David S . Miller" Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH net] rds: Fix NULL pointer dereference in __rds_rdma_map Date: Wed, 6 Dec 2017 17:18:28 +0100 Message-Id: <20171206161828.8368-1-Haakon.Bugge@oracle.com> X-Mailer: git-send-email 2.13.6 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8736 signatures=668641 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1712060234 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is a fix for syzkaller719569, where memory registration was attempted without any underlying transport being loaded. Analysis of the case reveals that it is the setsockopt() RDS_GET_MR (2) and RDS_GET_MR_FOR_DEST (7) that are vulnerable. Here is an example stack trace when the bug is hit: BUG: unable to handle kernel NULL pointer dereference at 00000000000000c0 IP: __rds_rdma_map+0x36/0x440 [rds] PGD 2f93d03067 P4D 2f93d03067 PUD 2f93d02067 PMD 0 Oops: 0000 [#1] SMP Modules linked in: bridge stp llc tun rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache rds binfmt_misc sb_edac intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul c rc32_pclmul ghash_clmulni_intel pcbc aesni_intel crypto_simd glue_helper cryptd iTCO_wdt mei_me sg iTCO_vendor_support ipmi_si mei ipmi_devintf nfsd shpchp pcspkr i2c_i801 ioatd ma ipmi_msghandler wmi lpc_ich mfd_core auth_rpcgss nfs_acl lockd grace sunrpc ip_tables ext4 mbcache jbd2 mgag200 i2c_algo_bit drm_kms_helper ixgbe syscopyarea ahci sysfillrect sysimgblt libahci mdio fb_sys_fops ttm ptp libata sd_mod mlx4_core drm crc32c_intel pps_core megaraid_sas i2c_core dca dm_mirror dm_region_hash dm_log dm_mod CPU: 48 PID: 45787 Comm: repro_set2 Not tainted 4.14.2-3.el7uek.x86_64 #2 Hardware name: Oracle Corporation ORACLE SERVER X5-2L/ASM,MOBO TRAY,2U, BIOS 31110000 03/03/2017 task: ffff882f9190db00 task.stack: ffffc9002b994000 RIP: 0010:__rds_rdma_map+0x36/0x440 [rds] RSP: 0018:ffffc9002b997df0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff882fa2182580 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffc9002b997e40 RDI: ffff882fa2182580 RBP: ffffc9002b997e30 R08: 0000000000000000 R09: 0000000000000002 R10: ffff885fb29e3838 R11: 0000000000000000 R12: ffff882fa2182580 R13: ffff882fa2182580 R14: 0000000000000002 R15: 0000000020000ffc FS: 00007fbffa20b700(0000) GS:ffff882fbfb80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000c0 CR3: 0000002f98a66006 CR4: 00000000001606e0 Call Trace: rds_get_mr+0x56/0x80 [rds] rds_setsockopt+0x172/0x340 [rds] ? __fget_light+0x25/0x60 ? __fdget+0x13/0x20 SyS_setsockopt+0x80/0xe0 do_syscall_64+0x67/0x1b0 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7fbff9b117f9 RSP: 002b:00007fbffa20aed8 EFLAGS: 00000293 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000000c84a4 RCX: 00007fbff9b117f9 RDX: 0000000000000002 RSI: 0000400000000114 RDI: 000000000000109b RBP: 00007fbffa20af10 R08: 0000000000000020 R09: 00007fbff9dd7860 R10: 0000000020000ffc R11: 0000000000000293 R12: 0000000000000000 R13: 00007fbffa20b9c0 R14: 00007fbffa20b700 R15: 0000000000000021 Code: 41 56 41 55 49 89 fd 41 54 53 48 83 ec 18 8b 87 f0 02 00 00 48 89 55 d0 48 89 4d c8 85 c0 0f 84 2d 03 00 00 48 8b 87 00 03 00 00 <48> 83 b8 c0 00 00 00 00 0f 84 25 03 00 0 0 48 8b 06 48 8b 56 08 The fix is to check the existence of an underlying transport in __rds_rdma_map(). Signed-off-by: Håkon Bugge Reported-by: syzbot Acked-by: Santosh Shilimkar --- net/rds/rdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/rds/rdma.c b/net/rds/rdma.c index 8886f15abe90..bc2f1e0977d6 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -183,7 +183,7 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args, long i; int ret; - if (rs->rs_bound_addr == 0) { + if (rs->rs_bound_addr == 0 || !rs->rs_transport) { ret = -ENOTCONN; /* XXX not a great errno */ goto out; }