[....] Starting enhanced syslogd: rsyslogd[ 12.498337] audit: type=1400 audit(1516256442.242:5): avc: denied { syslog } for pid=3495 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.930530] audit: type=1400 audit(1516256448.675:6): avc: denied { map } for pid=3635 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.227' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.257640] audit: type=1400 audit(1516256461.002:7): avc: denied { map } for pid=3651 comm="syzkaller832659" path="/root/syzkaller832659684" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 31.312106] kasan: CONFIG_KASAN_INLINE enabled [ 31.316828] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.324221] general protection fault: 0000 [#1] SMP KASAN [ 31.329735] Dumping ftrace buffer: [ 31.333248] (ftrace buffer empty) [ 31.336929] Modules linked in: [ 31.340096] CPU: 1 PID: 3677 Comm: syzkaller832659 Not tainted 4.15.0-rc8+ #266 [ 31.347513] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.356847] RIP: 0010:pppol2tp_connect+0x10a3/0x1dd0 [ 31.361920] RSP: 0018:ffff8801d99dfaf0 EFLAGS: 00010202 [ 31.367253] RAX: dffffc0000000000 RBX: ffff8801d9a24b80 RCX: ffffffff850248e0 [ 31.374496] RDX: 0000000000000045 RSI: 0000000009c82228 RDI: 0000000000000228 [ 31.381738] RBP: ffff8801d99dfd70 R08: 1ffff1003b33be9f R09: 0000000000000002 [ 31.388980] R10: ffff8801d99df9c0 R11: 0000000000000000 R12: ffff8801d9594900 [ 31.396221] R13: ffff8801d99dfd48 R14: 0000000000000000 R15: ffff8801d99dfc28 [ 31.403463] FS: 00007fc5a94fe700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.411659] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.417511] CR2: 0000000020e71000 CR3: 00000001d9b6e005 CR4: 00000000001606e0 [ 31.424757] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.431996] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.439236] Call Trace: [ 31.441806] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 31.446969] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 31.452306] ? selinux_socket_connect+0x311/0x730 [ 31.457119] ? lock_downgrade+0x980/0x980 [ 31.461238] ? selinux_socket_setsockopt+0x80/0x80 [ 31.466134] ? lock_release+0xa40/0xa40 [ 31.470088] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 31.475941] ? __check_object_size+0x25d/0x4f0 [ 31.480496] ? handle_mm_fault+0x410/0x8d0 [ 31.484699] ? __might_sleep+0x95/0x190 [ 31.488646] ? security_socket_connect+0x89/0xb0 [ 31.493377] SYSC_connect+0x213/0x4a0 [ 31.497149] ? SYSC_bind+0x410/0x410 [ 31.500837] ? do_page_fault+0xee/0x720 [ 31.504779] ? __do_page_fault+0xc90/0xc90 [ 31.508990] ? do_futex+0x22a0/0x22a0 [ 31.512757] ? SyS_socket+0x12d/0x1d0 [ 31.516529] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 31.521341] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.526327] SyS_connect+0x24/0x30 [ 31.529837] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 31.534561] RIP: 0033:0x445d29 [ 31.537719] RSP: 002b:00007fc5a94fddb8 EFLAGS: 00000293 ORIG_RAX: 000000000000002a [ 31.545395] RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445d29 [ 31.552636] RDX: 0000000000000032 RSI: 0000000020e71000 RDI: 0000000000000006 [ 31.559872] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 31.567110] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 [ 31.574348] R13: 00007ffcecd629cf R14: 00007fc5a94fe9c0 R15: 0000000000000007 [ 31.581595] Code: fe ff ff e8 b0 ce 6d fc 4c 89 fa 49 8d be 28 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e5 09 00 00 4c 89 fa 48 b8 00 00 00 00 00 fc [ 31.600663] RIP: pppol2tp_connect+0x10a3/0x1dd0 RSP: ffff8801d99dfaf0 [ 31.607274] ---[ end trace 4d10cd971bf8212c ]--- [ 31.612024] Kernel panic - not syncing: Fatal exception [ 31.617707] Dumping ftrace buffer: [ 31.621219] (ftrace buffer empty) [ 31.624898] Kernel Offset: disabled [ 31.628496] Rebooting in 86400 seconds..