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 X-Spam-Level: X-Spam-Status: No, score=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3279EC04EB9 for ; Wed, 5 Dec 2018 19:31:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB05B20879 for ; Wed, 5 Dec 2018 19:31:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EB05B20879 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728547AbeLETbH (ORCPT ); Wed, 5 Dec 2018 14:31:07 -0500 Received: from mail-it1-f200.google.com ([209.85.166.200]:41107 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728189AbeLETbE (ORCPT ); Wed, 5 Dec 2018 14:31:04 -0500 Received: by mail-it1-f200.google.com with SMTP id 123so17547182itv.6 for ; Wed, 05 Dec 2018 11:31:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=o/5q+EiSW/dgkrwWBnQBXqJ1QIoBjGhjPebH4qn/PGk=; b=oJWfSODp3saE0ZVAMQj2ON+DzEWTYM8M0lm4AFDRMNBC3ruRGbfdufDLwsRLus6vXc OKWjJhHUTqFu5ao08E+5lsP/sfPTDXcDWU7snfvRHkRsq9zzcu9EfWsiOB/ItPUTB+7f P+QsnfP1Fo5j28QC3Zd8teJuxCIU/LULZCTTnEfDE+PzukYwTCVvG2LA9FNSIb8SHdyD /GrOXo0YnQrRu4FOcLMc7RXEakddmD9tEb+dFpgEFThFWL9Td3dt8OZQ7TCfVojnY2HM A8IBMJhxN/IV53ru92Xw0t+rzBJy1ruY+Umlm82tijBk/ZNyZduPzH+Bwzugd2MmfhWr PpLA== X-Gm-Message-State: AA+aEWb9TznmOBNK5G69febXl5lZk1n8qex2/vqQhOPLpV4R2PJfJW5W 7zCvf4Tm3G3T/53LjpGeOh/A4V7kuqAlKfJ/YxF9UBcAF6wX X-Google-Smtp-Source: AFSGD/UDHVdrzYkQc32Devnm1eEsYc4v/fE1C0OjkJjdEtEFMR9GgZ533CxMtvh8FMZYeVOd+iztA0ottBedGwFz3HXC5oyhf9gN MIME-Version: 1.0 X-Received: by 2002:a24:6212:: with SMTP id d18mr13400849itc.29.1544038263094; Wed, 05 Dec 2018 11:31:03 -0800 (PST) Date: Wed, 05 Dec 2018 11:31:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000311344057c4b6cc3@google.com> Subject: KMSAN: kernel-infoleak in sctp_getsockopt From: syzbot To: davem@davemloft.net, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, vyasevich@gmail.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: fffec98ae2a6 net: proper support for CONFIG_GENERIC_CSUM o.. git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=12e84a47400000 kernel config: https://syzkaller.appspot.com/x/.config?x=56b48b46dafe4516 dashboard link: https://syzkaller.appspot.com/bug?extid=ad5d327e6936a2e284be compiler: clang version 8.0.0 (trunk 343298) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103cd225400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ad5d327e6936a2e284be@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 ================================================================== BUG: KMSAN: kernel-infoleak in _copy_to_user+0x19a/0x230 lib/usercopy.c:33 CPU: 1 PID: 8164 Comm: syz-executor2 Not tainted 4.20.0-rc3+ #95 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x32d/0x480 lib/dump_stack.c:113 kmsan_report+0x12c/0x290 mm/kmsan/kmsan.c:683 kmsan_internal_check_memory+0x32a/0xa50 mm/kmsan/kmsan.c:743 kmsan_copy_to_user+0x78/0xd0 mm/kmsan/kmsan_hooks.c:634 _copy_to_user+0x19a/0x230 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:183 [inline] sctp_getsockopt_local_addrs net/sctp/socket.c:5998 [inline] sctp_getsockopt+0x15248/0x186f0 net/sctp/socket.c:7477 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 __sys_getsockopt+0x489/0x550 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4991886c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457569 RDX: 000000000000006d RSI: 0000000000000084 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000020000140 R09: 0000000000000000 R10: 0000000020001100 R11: 0000000000000246 R12: 00007f49918876d4 R13: 00000000004c7d88 R14: 00000000004ce348 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] kmsan_save_stack mm/kmsan/kmsan.c:261 [inline] kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:469 kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:344 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:362 __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:162 sctp_copy_laddrs net/sctp/socket.c:5901 [inline] sctp_getsockopt_local_addrs net/sctp/socket.c:5967 [inline] sctp_getsockopt+0x14f41/0x186f0 net/sctp/socket.c:7477 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 __sys_getsockopt+0x489/0x550 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] kmsan_save_stack mm/kmsan/kmsan.c:261 [inline] kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:469 kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:344 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:362 __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:162 sctp_copy_laddrs net/sctp/socket.c:5890 [inline] sctp_getsockopt_local_addrs net/sctp/socket.c:5967 [inline] sctp_getsockopt+0x14de8/0x186f0 net/sctp/socket.c:7477 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 __sys_getsockopt+0x489/0x550 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] kmsan_internal_poison_shadow+0x6d/0x130 mm/kmsan/kmsan.c:170 kmsan_kmalloc+0xa1/0x100 mm/kmsan/kmsan_hooks.c:186 __kmalloc+0x14c/0x4d0 mm/slub.c:3825 kmalloc include/linux/slab.h:551 [inline] sctp_inet6addr_event+0x60e/0xbd0 net/sctp/ipv6.c:100 notifier_call_chain kernel/notifier.c:93 [inline] __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x13d/0x240 kernel/notifier.c:193 inet6addr_notifier_call_chain+0x76/0x90 net/ipv6/addrconf_core.c:107 ipv6_add_addr+0x2597/0x2890 net/ipv6/addrconf.c:1115 inet6_addr_add+0xc86/0x1c10 net/ipv6/addrconf.c:2912 inet6_rtm_newaddr+0x167e/0x3d20 net/ipv6/addrconf.c:4750 rtnetlink_rcv_msg+0x1148/0x1540 net/core/rtnetlink.c:4947 netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4965 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x1699/0x1740 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x13c7/0x1440 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe3b/0x1240 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Bytes 32-35 of 2100 are uninitialized Memory access of size 2100 starts at ffff888185d8b000 Data copied to user address 0000000020001108 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches