From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.codeaurora.org by pdx-caf-mail.web.codeaurora.org (Dovecot) with LMTP id zx/5F270G1u0agAAmS7hNA ; Sat, 09 Jun 2018 15:38:22 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 4F723608C1; Sat, 9 Jun 2018 15:38:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=2.0 tests=BAYES_00,FROM_LOCAL_HEX, MAILING_LIST_MULTI,SORTED_RECIPS autolearn=no autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by smtp.codeaurora.org (Postfix) with ESMTP id AF56A607DC; Sat, 9 Jun 2018 15:38:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org AF56A607DC Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933154AbeFIPiU (ORCPT + 25 others); Sat, 9 Jun 2018 11:38:20 -0400 Received: from mail-it0-f70.google.com ([209.85.214.70]:59506 "EHLO mail-it0-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933152AbeFIPgC (ORCPT ); Sat, 9 Jun 2018 11:36:02 -0400 Received: by mail-it0-f70.google.com with SMTP id v127-v6so4279731ith.9 for ; Sat, 09 Jun 2018 08:36:02 -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:in-reply-to:message-id:subject :from:to; bh=1bUmUa3NuIeeF1Y9aewinoxWvokau+EyUezmM6pr+D0=; b=I3ae4DJSjedLcn4IEqqmbXK6UwKRY+Xmt/iYbduNI3KdlHROsbO390IW6o9Z7IlXSt yvEwpdW2cq8LY4A0UruXxf06NuZasB1C5if5CrFuj94AktT0DHWsXoC0bAnw63D7pPCm AymUyjNv2scMyX5zxrKWFkma17xC4xgzH4HX9bcxx4y5tzqesf6RdnGXZWWOLRB8zXeF Ny3wT9y/g2DTMKgBHTOQn44PL7JVCVZkwgqiWwz0qhFDYyGJz9h1dv/Vwo3d16RFkOCf MTQETQL1RzGPEhuegDu/4nELJva16AWYDd/rOQzgM7qTQU+8HDnzHuK4aTxeP+6+WJs3 qtlg== X-Gm-Message-State: APt69E31+EqxUMjwEmdjMkp8w9wfzS0fOeHe79WR/N9k8iVNmeBwa9xG 3UFR/RCiimusMbit4JSGnlwsS3DWL1EW5EzHixdf3OR6iCwZ X-Google-Smtp-Source: ADUXVKLjLpcZXl2VkrzuDnkoX8wCvMN+1a9D7pax/uGAU+xPkUFIxcPTRZPe3tgHfnZdg1l6zB1CVUtv9I+P8AyD6eWCs8txbCJ0 MIME-Version: 1.0 X-Received: by 2002:a24:5cca:: with SMTP id q193-v6mr2617141itb.38.1528558561645; Sat, 09 Jun 2018 08:36:01 -0700 (PDT) Date: Sat, 09 Jun 2018 08:36:01 -0700 In-Reply-To: <000000000000973c2c056e0ecddd@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000015df96056e374691@google.com> Subject: Re: general protection fault in __vfs_write From: syzbot To: alexei.starovoitov@gmail.com, ast@kernel.org, daniel@iogearbox.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, willy@infradead.org 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 syzbot has found a reproducer for the following crash on: HEAD commit: 3a979e8c07e3 Merge tag 'mailbox-v4.18' of git://git.linaro.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=11e0c81f800000 kernel config: https://syzkaller.appspot.com/x/.config?x=412e35656a3f7c09 dashboard link: https://syzkaller.appspot.com/bug?extid=7ade6c94abb2774c0fee compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1665abf7800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7ade6c94abb2774c0fee@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 bpfilter: read fail -512 kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN CPU: 0 PID: 4546 Comm: syz-executor6 Not tainted 4.17.0+ #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:file_write_hint include/linux/fs.h:1932 [inline] RIP: 0010:init_sync_kiocb include/linux/fs.h:1942 [inline] RIP: 0010:new_sync_write fs/read_write.c:470 [inline] RIP: 0010:__vfs_write+0x4a6/0x960 fs/read_write.c:487 Code: c1 ea 03 80 3c 02 00 0f 85 1b 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d bc 24 c8 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ec 02 00 00 41 8b 84 24 c8 00 RSP: 0018:ffff8801ae407850 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8801cd88f580 RCX: ffffffff81c0d6fb RDX: 0000000000000019 RSI: ffffffff81c0d70a RDI: 00000000000000c8 RBP: ffff8801ae4079c8 R08: ffff8801d88ee680 R09: fffffbfff130c5d9 R10: ffff8801ae407a10 R11: ffffffff89862ecb R12: 0000000000000000 R13: ffff8801ae4079a0 R14: 0000000000000000 R15: ffff8801ae407a88 FS: 000000000102f940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5f52ac0518 CR3: 00000001d8d8a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __kernel_write+0x10c/0x380 fs/read_write.c:506 __bpfilter_process_sockopt+0x1d8/0x35b net/bpfilter/bpfilter_kern.c:66 bpfilter_mbox_request+0x4d/0xb0 net/ipv4/bpfilter/sockopt.c:25 bpfilter_ip_get_sockopt+0x6b/0x90 net/ipv4/bpfilter/sockopt.c:42 ip_getsockopt+0x238/0x2a0 net/ipv4/ip_sockglue.c:1563 tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3532 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3012 __sys_getsockopt+0x1a5/0x370 net/socket.c:1972 __do_sys_getsockopt net/socket.c:1983 [inline] __se_sys_getsockopt net/socket.c:1980 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1980 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4584ea Code: b8 34 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 1d 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 fa 8e fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:0000000000a3e328 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000a3e350 RCX: 00000000004584ea RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000706f20 R08: 0000000000a3e34c R09: 0000000000004000 R10: 0000000000a3e350 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000706860 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 9a583fc95516c106 ]--- RIP: 0010:file_write_hint include/linux/fs.h:1932 [inline] RIP: 0010:init_sync_kiocb include/linux/fs.h:1942 [inline] RIP: 0010:new_sync_write fs/read_write.c:470 [inline] RIP: 0010:__vfs_write+0x4a6/0x960 fs/read_write.c:487 Code: c1 ea 03 80 3c 02 00 0f 85 1b 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d bc 24 c8 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ec 02 00 00 41 8b 84 24 c8 00 RSP: 0018:ffff8801ae407850 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8801cd88f580 RCX: ffffffff81c0d6fb RDX: 0000000000000019 RSI: ffffffff81c0d70a RDI: 00000000000000c8 RBP: ffff8801ae4079c8 R08: ffff8801d88ee680 R09: fffffbfff130c5d9 R10: ffff8801ae407a10 R11: ffffffff89862ecb R12: 0000000000000000 R13: ffff8801ae4079a0 R14: 0000000000000000 R15: ffff8801ae407a88 FS: 000000000102f940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5f52ac0518 CR3: 00000001d8d8a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400