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_HELO_NONE,SPF_PASS autolearn=unavailable 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 350F3C388F3 for ; Mon, 30 Sep 2019 07:11:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1573F218DE for ; Mon, 30 Sep 2019 07:11:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729280AbfI3HLI (ORCPT ); Mon, 30 Sep 2019 03:11:08 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:48764 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725794AbfI3HLH (ORCPT ); Mon, 30 Sep 2019 03:11:07 -0400 Received: by mail-io1-f71.google.com with SMTP id w16so28497337ioc.15 for ; Mon, 30 Sep 2019 00:11:07 -0700 (PDT) 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=no/fJ4kEHtF7S7dZrIXoqdgmhjfpV6Rp9i2xAq4jHGY=; b=dqhRf2N5NNLdPtVqWc0wpi+KwLGQuCRpXcilhfRe+F/FVrWOBeMpP5wQN9yKL1PzSl 3odbZDVZ+SvbDjBEd5A/2ysKOSEO80XEoOiXQTrjBsLK6VN409kWfZQjHAgZ7UkjDoZj fZzh4BbEaB1IesTuQp1ZKhdGaeHij+id5ImFVdca1AgPR2+V7AlkGSRInMi0rye6Jg2J fTg4K5YreEi99DT3pIeC+aHHPWZjvc5EGEp6vmAI/PJnDD1XQkjaNw6/dF/zYAnQJc0B yMrx0SuDj6eny/3hTUih0CnjJ6pDeD2hgelB0fEG83gsS8xKl3C4RLhweHJJpbtnjcu6 xxyA== X-Gm-Message-State: APjAAAXbXvxnna5lFdv+pnyY9b+Gh2Uv49a22UDlu8LlMJFWYUw6ulmW poOoclvfyq+Qfm9SY2vMjjaRdO2s3CRjPmIqoDCihWmawckY X-Google-Smtp-Source: APXvYqxIKz+As8+Qavz0Ymjn0rB9AZryTW33OmEjS9T4M4+ln+fVv/6g2V+X6Yecl9pU4ElHuOcekLNkCOVy+oDKpm/fcOapKFDi MIME-Version: 1.0 X-Received: by 2002:a5e:da0a:: with SMTP id x10mr20533544ioj.286.1569827466834; Mon, 30 Sep 2019 00:11:06 -0700 (PDT) Date: Mon, 30 Sep 2019 00:11:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000084fb070593bff0fb@google.com> Subject: BUG: unable to handle kernel NULL pointer dereference in xsk_poll From: syzbot To: ast@kernel.org, bjorn.topel@intel.com, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, jakub.kicinski@netronome.com, john.fastabend@gmail.com, jonathan.lemon@gmail.com, kafai@fb.com, linux-kernel@vger.kernel.org, magnus.karlsson@intel.com, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: a3c0e7b1 Merge tag 'libnvdimm-fixes-5.4-rc1' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f05435600000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ffbfa7e4a36190f dashboard link: https://syzkaller.appspot.com/bug?extid=a5765ed8cdb1cca4d249 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1096d835600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=129f15f3600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a5765ed8cdb1cca4d249@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready 8021q: adding VLAN 0 to HW filter on device batadv0 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 99226067 P4D 99226067 PUD 8fa47067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8719 Comm: syz-executor502 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff88809dd4f848 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88808c06d740 RCX: 1ffff1101180db7c RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffff88809a190b00 RBP: ffff88809dd4f880 R08: ffff8880921924c0 R09: ffffed101180db31 R10: ffffed101180db30 R11: ffff88808c06d987 R12: 0000000000000002 R13: 0000000000000304 R14: ffff88809a190b00 R15: 0000000000000000 FS: 0000000001b27880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000a307a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: xsk_poll+0x1e7/0x5a0 net/xdp/xsk.c:430 sock_poll+0x15e/0x480 net/socket.c:1256 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:859 [inline] do_poll fs/select.c:907 [inline] do_sys_poll+0x63c/0xdd0 fs/select.c:1001 __do_sys_ppoll fs/select.c:1101 [inline] __se_sys_ppoll fs/select.c:1081 [inline] __x64_sys_ppoll+0x259/0x310 fs/select.c:1081 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441bd9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd48824e98 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441bd9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000020000040 RBP: 00007ffd48824eb0 R08: 0000000000000000 R09: 0000000001bbbbbb R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000403170 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000000 ---[ end trace e262cafe88422aec ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff88809dd4f848 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88808c06d740 RCX: 1ffff1101180db7c RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffff88809a190b00 RBP: ffff88809dd4f880 R08: ffff8880921924c0 R09: ffffed101180db31 R10: ffffed101180db30 R11: ffff88808c06d987 R12: 0000000000000002 R13: 0000000000000304 R14: ffff88809a190b00 R15: 0000000000000000 FS: 0000000001b27880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000a307a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches