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=-0.6 required=3.0 tests=FROM_LOCAL_DIGITS, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 B9520C04EB8 for ; Mon, 10 Dec 2018 07:51:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C2AC205C9 for ; Mon, 10 Dec 2018 07:51:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7C2AC205C9 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 S1726672AbeLJHvI (ORCPT ); Mon, 10 Dec 2018 02:51:08 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:43966 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726210AbeLJHvF (ORCPT ); Mon, 10 Dec 2018 02:51:05 -0500 Received: by mail-io1-f72.google.com with SMTP id k4so10493119ioc.10 for ; Sun, 09 Dec 2018 23:51:04 -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=bbeR77WLkURfcQZItwaOi/Dxdmie58Iaj/gaRr3ztpY=; b=S6/7MA+FlZb2FhLLGUBM388bng+8/TVkVAldY0nupP0ikqqaKU8qxdG6I4OsTQzJVV QcCYQZJxY51YakObJp7miwXeXj8eU8k/Un4IB1/X8N8hE1fN0+rH+qG8kXFT1T1ymfC4 GMAIqK0SVEpIBHJmVF2IVW8wyQXHK2BTWsfw52UOfWiWMZ2mPH6vBk+vLtOLVd7oMy6e y9CrHHHtdqIjxT5ERvyh1XwrTdorfpKFBF3ShYs8RKT+FE8FeGSqNo8KxuCVrzXzHF1R 7QrzUYmzi92DZ31HsXqp5o/X37EdD8z7nEWfaL2+J2TN2i+4kTj/RICOc5DmTcoUZhOG CGKQ== X-Gm-Message-State: AA+aEWb+ZhUBxDg9J5DEr4Qqc9yPgrnyU80ZINa3W8i+gD1zfhAvat+j wGCuyLj9ft/mVqAyNVCqcK6HRQL93FcI+G1N19lymAHU1Ttj X-Google-Smtp-Source: AFSGD/UCALTGzcuPhbT7fJiPTtl8/D5OdiAXZea1Z2E+kIfIZtCumZ2/j+LN2lRoAelqGJkSEgAFGQjpd3h4Qvg7TjYxVwfDycTm MIME-Version: 1.0 X-Received: by 2002:a24:454e:: with SMTP id y75mr9315485ita.37.1544428263633; Sun, 09 Dec 2018 23:51:03 -0800 (PST) Date: Sun, 09 Dec 2018 23:51:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000008ff3b057ca63a31@google.com> Subject: KASAN: slab-out-of-bounds Read in ___neigh_create From: syzbot To: christian@brauner.io, davem@davemloft.net, dsahern@gmail.com, edumazet@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, roopa@cumulusnetworks.com, syzkaller-bugs@googlegroups.com, w.bumiller@proxmox.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: a60956ed72f7 net: dsa: Make dsa_master_set_mtu() static git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=17d2f3f5400000 kernel config: https://syzkaller.appspot.com/x/.config?x=28ecefa8a6e10719 dashboard link: https://syzkaller.appspot.com/bug?extid=3ddead5619658537909b compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3ddead5619658537909b@syzkaller.appspotmail.com syz-executor0 (7463) used greatest stack depth: 14544 bytes left audit: type=1804 audit(1544397792.605:33): pid=7506 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor0" name="/root/syzkaller-testdir029218375/syzkaller.aGerof/1/memory.events" dev="sda1" ino=16519 res=1 ================================================================== BUG: KASAN: slab-out-of-bounds in __list_add_valid+0x8f/0xac lib/list_debug.c:26 Read of size 8 at addr ffff8881ca015db0 by task syz-executor2/7521 CPU: 1 PID: 7521 Comm: syz-executor2 Not tainted 4.20.0-rc4+ #335 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_add_valid+0x8f/0xac lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] neigh_alloc net/core/neighbour.c:395 [inline] ___neigh_create+0x14b7/0x2600 net/core/neighbour.c:553 __neigh_create+0x30/0x40 net/core/neighbour.c:640 ip_finish_output2+0xb8b/0x1860 net/ipv4/ip_output.c:224 ip_finish_output+0x7fd/0xfa0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_mc_output+0x2c4/0x15b0 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 ip_send_skb+0x40/0xe0 net/ipv4/ip_output.c:1464 udp_send_skb.isra.46+0x6ad/0x1160 net/ipv4/udp.c:929 udp_sendmsg+0x2953/0x3c40 net/ipv4/udp.c:1216 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x51d/0x930 net/socket.c:2116 __sys_sendmmsg+0x246/0x6d0 net/socket.c:2211 __do_sys_sendmmsg net/socket.c:2240 [inline] __se_sys_sendmmsg net/socket.c:2237 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2237 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457659 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:00007f0c5d66fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457659 RDX: 04000000000001a8 RSI: 0000000020007fc0 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0c5d6706d4 R13: 00000000004c3e14 R14: 00000000004d6c38 R15: 00000000ffffffff Allocated by task 7079: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 kmem_cache_zalloc include/linux/slab.h:731 [inline] copy_signal kernel/fork.c:1521 [inline] copy_process+0x2aba/0x87a0 kernel/fork.c:1914 _do_fork+0x1cb/0x11d0 kernel/fork.c:2216 __do_sys_clone kernel/fork.c:2323 [inline] __se_sys_clone kernel/fork.c:2317 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2317 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7091: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3760 free_signal_struct kernel/fork.c:707 [inline] put_signal_struct kernel/fork.c:713 [inline] __put_task_struct+0x3cd/0x620 kernel/fork.c:727 put_task_struct include/linux/sched/task.h:96 [inline] delayed_put_task_struct+0x2ff/0x4c0 kernel/exit.c:181 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0x100a/0x1ac0 kernel/rcu/tree.c:2697 __do_softirq+0x308/0xb7e kernel/softirq.c:292 The buggy address belongs to the object at ffff8881ca015800 which belongs to the cache signal_cache of size 1328 The buggy address is located 128 bytes to the right of 1328-byte region [ffff8881ca015800, ffff8881ca015d30) The buggy address belongs to the page: page:ffffea0007280500 count:1 mapcount:0 mapping:ffff8881da97adc0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea000731ae08 ffffea00070cc708 ffff8881da97adc0 raw: 0000000000000000 ffff8881ca014100 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ca015c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ca015d00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc > ffff8881ca015d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881ca015e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881ca015e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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.