From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752579AbeE0WP6 (ORCPT ); Sun, 27 May 2018 18:15:58 -0400 Received: from www62.your-server.de ([213.133.104.62]:47720 "EHLO www62.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752448AbeE0WP5 (ORCPT ); Sun, 27 May 2018 18:15:57 -0400 Subject: Re: general protection fault in bpf_tcp_close To: syzbot , ast@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, john.fastabend@gmail.com References: <00000000000098e65b056d184a11@google.com> From: Daniel Borkmann Message-ID: <7257c52b-7632-e313-6e80-a4bc1f8a6bf0@iogearbox.net> Date: Mon, 28 May 2018 00:15:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <00000000000098e65b056d184a11@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Authenticated-Sender: daniel@iogearbox.net Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ +John ] On 05/26/2018 11:13 AM, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    fd0bfa8d6e04 Merge branch 'bpf-af-xdp-cleanups' > git tree:       bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11da9427800000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=b632d8e2c2ab2c1 > dashboard link: https://syzkaller.appspot.com/bug?extid=0ce137753c78f7b6acc1 > 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+0ce137753c78f7b6acc1@syzkaller.appspotmail.com Should be fixed by: https://patchwork.ozlabs.org/patch/920695/ > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > Dumping ftrace buffer: >    (ftrace buffer empty) > Modules linked in: > CPU: 0 PID: 12139 Comm: syz-executor2 Not tainted 4.17.0-rc4+ #17 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:__hlist_del include/linux/list.h:649 [inline] > RIP: 0010:hlist_del_rcu include/linux/rculist.h:427 [inline] > RIP: 0010:bpf_tcp_close+0x7d2/0xf80 kernel/bpf/sockmap.c:271 > RSP: 0018:ffff8801a8f8ef70 EFLAGS: 00010a02 > RAX: ffffed00351f1dfd RBX: dffffc0000000000 RCX: dead000000000200 > RDX: 0000000000000000 RSI: 1bd5a00000000040 RDI: ffff8801cb710910 > RBP: ffff8801a8f8f110 R08: ffffed003350ac9d R09: ffffed003350ac9c > R10: ffffed003350ac9c R11: ffff88019a8564e3 R12: ffff8801cb710380 > R13: ffff8801b17ea6e0 R14: ffff8801cb710398 R15: ffff8801cb710900 > FS:  00007f9890c43700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fde1a668000 CR3: 000000019dca2000 CR4: 00000000001406f0 > DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 > Call Trace: >  inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427 >  inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459 >  sock_release+0x96/0x1b0 net/socket.c:594 >  sock_close+0x16/0x20 net/socket.c:1149 >  __fput+0x34d/0x890 fs/file_table.c:209 >  ____fput+0x15/0x20 fs/file_table.c:243 >  task_work_run+0x1e4/0x290 kernel/task_work.c:113 >  exit_task_work include/linux/task_work.h:22 [inline] >  do_exit+0x1aee/0x2730 kernel/exit.c:865 >  do_group_exit+0x16f/0x430 kernel/exit.c:968 >  get_signal+0x886/0x1960 kernel/signal.c:2469 >  do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810 >  exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162 >  prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] >  syscall_return_slowpath arch/x86/entry/common.c:265 [inline] >  do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290 >  entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x455a09 > RSP: 002b:00007f9890c42ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca > RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000455a09 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8 > RBP: 000000000072bec8 R08: 0000000000000000 R09: 000000000072bea0 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffcb48ac3ff R14: 00007f9890c439c0 R15: 0000000000000000 > Code: ff 48 c1 e9 03 80 3c 19 00 0f 85 a9 05 00 00 49 8b 4f 18 48 8b 85 98 fe ff ff 48 89 ce c6 00 00 48 c1 ee 03 48 89 95 d8 fe ff ff <80> 3c 1e 00 0f 85 c6 05 00 00 48 8b 85 98 fe ff ff 48 85 d2 48 > RIP: __hlist_del include/linux/list.h:649 [inline] RSP: ffff8801a8f8ef70 > RIP: hlist_del_rcu include/linux/rculist.h:427 [inline] RSP: ffff8801a8f8ef70 > RIP: bpf_tcp_close+0x7d2/0xf80 kernel/bpf/sockmap.c:271 RSP: ffff8801a8f8ef70 > ---[ end trace e81227e93c7e7b75 ]--- > > > --- > 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.