From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f69.google.com ([209.85.214.69]:56366 "EHLO mail-it0-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726859AbeHLIPs (ORCPT ); Sun, 12 Aug 2018 04:15:48 -0400 Received: by mail-it0-f69.google.com with SMTP id f184-v6so2508808itc.6 for ; Sat, 11 Aug 2018 22:39:03 -0700 (PDT) MIME-Version: 1.0 Date: Sat, 11 Aug 2018 22:39:02 -0700 Message-ID: <000000000000f3735a05733664b3@google.com> Subject: general protection fault in kstrtouint From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Hello, syzbot found the following crash on: HEAD commit: 2b769bb85b48 Add linux-next specific files for 20180807 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1525beac400000 kernel config: https://syzkaller.appspot.com/x/.config?x=547d800b8773c2c5 dashboard link: https://syzkaller.appspot.com/bug?extid=657c927f261cbdd5c50f compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=170cdffc400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160f7830400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+657c927f261cbdd5c50f@syzkaller.appspotmail.com random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) 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 CPU: 0 PID: 4328 Comm: syz-executor623 Not tainted 4.18.0-rc8-next-20180807+ #33 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kstrtoull lib/kstrtox.c:123 [inline] RIP: 0010:kstrtouint+0x83/0x1b0 lib/kstrtox.c:222 Code: f1 f1 c7 40 04 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 1a 31 18 fe 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 e8 00 00 00 44 0f b6 33 bf RSP: 0018:ffff8801ad63f888 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff10035ac7f5f RDX: 0000000000000000 RSI: ffffffff8364fc96 RDI: 0000000000000000 RBP: ffff8801ad63f918 R08: ffff8801ad5da3c0 R09: ffff8801ad588580 R10: 00000000900ed4cc R11: ffff8801db0236b3 R12: 1ffff10035ac7f12 R13: ffff8801ad63fa18 R14: dffffc0000000000 R15: ffff8801ad63f8f0 FS: 0000000001d3b880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd50b94518 CR3: 00000001c46c3000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fs_parse+0xb8d/0x1130 fs/fs_parser.c:164 hugetlbfs_parse_param+0xd1/0xa50 fs/hugetlbfs/inode.c:1210 vfs_parse_fs_param+0x196/0x2c0 fs/fs_context.c:162 vfs_parse_fs_string+0x1d5/0x2b0 fs/fs_context.c:191 generic_parse_monolithic+0x17c/0x210 fs/fs_context.c:228 parse_monolithic_mount_data fs/namespace.c:2320 [inline] do_new_mount fs/namespace.c:2599 [inline] do_mount+0x6d8/0x1e30 fs/namespace.c:2927 ksys_mount+0x12d/0x140 fs/namespace.c:3143 __do_sys_mount fs/namespace.c:3157 [inline] __se_sys_mount fs/namespace.c:3154 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3154 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4441a9 Code: 0d d8 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcb4f5f8a8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004441a9 RDX: 0000000020000300 RSI: 0000000020000340 RDI: 0000000020000000 RBP: 00000000006cf018 R08: 00000000200001c0 R09: 00000000200001c0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401e10 R13: 0000000000401ea0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 3277e6ee2f78e7e4 ]--- RIP: 0010:kstrtoull lib/kstrtox.c:123 [inline] RIP: 0010:kstrtouint+0x83/0x1b0 lib/kstrtox.c:222 Code: f1 f1 c7 40 04 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 1a 31 18 fe 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 e8 00 00 00 44 0f b6 33 bf RSP: 0018:ffff8801ad63f888 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff10035ac7f5f RDX: 0000000000000000 RSI: ffffffff8364fc96 RDI: 0000000000000000 RBP: ffff8801ad63f918 R08: ffff8801ad5da3c0 R09: ffff8801ad588580 R10: 00000000900ed4cc R11: ffff8801db0236b3 R12: 1ffff10035ac7f12 R13: ffff8801ad63fa18 R14: dffffc0000000000 R15: ffff8801ad63f8f0 FS: 0000000001d3b880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd50b94518 CR3: 00000001c46c3000 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#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