[....] Starting enhanced syslogd: rsyslogd[ 18.095153] audit: type=1400 audit(1517270440.462:5): avc: denied { syslog } for pid=4019 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 23.039481] audit: type=1400 audit(1517270445.407:6): avc: denied { map } for pid=4158 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 [ 29.374126] audit: type=1400 audit(1517270451.741:7): avc: denied { map } for pid=4172 comm="syzkaller263685" path="/root/syzkaller263685687" 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 executing program executing program executing program executing program executing program executing program executing program [ 29.491130] kasan: CONFIG_KASAN_INLINE enabled [ 29.495775] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.503157] general protection fault: 0000 [#1] SMP KASAN [ 29.508677] Dumping ftrace buffer: [ 29.512187] (ftrace buffer empty) [ 29.515868] Modules linked in: [ 29.519042] CPU: 1 PID: 4188 Comm: syzkaller263685 Not tainted 4.15.0+ #285 [ 29.526113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.535443] RIP: 0010:pppol2tp_connect+0x10a3/0x1dd0 [ 29.540513] RSP: 0018:ffff8801ac5b7af0 EFLAGS: 00010202 [ 29.545851] RAX: dffffc0000000000 RBX: ffff8801b2212d80 RCX: ffffffff85115570 [ 29.553097] RDX: 0000000000000045 RSI: 000000007a5bf5da RDI: 0000000000000228 [ 29.560354] RBP: ffff8801ac5b7d70 R08: 1ffff100358b6e9f R09: 0000000000000002 [ 29.567595] R10: ffff8801ac5b79c0 R11: 0000000000000000 R12: ffff8801aff904c0 [ 29.574834] R13: ffff8801ac5b7d48 R14: 0000000000000000 R15: ffff8801ac5b7c28 [ 29.582078] FS: 0000000001546880(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 [ 29.590273] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.596126] CR2: 000000002014cfd2 CR3: 00000001af82e002 CR4: 00000000001606e0 [ 29.603380] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.610622] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.617862] Call Trace: [ 29.620441] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 29.625608] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 29.630947] ? selinux_socket_connect+0x311/0x730 [ 29.635760] ? lock_downgrade+0x980/0x980 [ 29.639877] ? lock_downgrade+0x980/0x980 [ 29.643996] ? selinux_socket_setsockopt+0x80/0x80 [ 29.648900] ? lock_release+0xa40/0xa40 [ 29.652845] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 29.658704] ? __check_object_size+0x25d/0x4f0 [ 29.663256] ? handle_mm_fault+0x410/0x8d0 [ 29.667463] ? __might_sleep+0x95/0x190 [ 29.671413] ? security_socket_connect+0x89/0xb0 [ 29.676143] SYSC_connect+0x213/0x4a0 [ 29.679915] ? SYSC_bind+0x410/0x410 [ 29.683603] ? do_page_fault+0xee/0x720 [ 29.687548] ? __do_page_fault+0xc90/0xc90 [ 29.691757] ? sock_map_fd+0x53/0x90 [ 29.695441] ? SyS_socket+0x12d/0x1d0 [ 29.699211] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 29.704030] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.709026] SyS_connect+0x24/0x30 [ 29.712540] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 29.717266] RIP: 0033:0x440c99 [ 29.720428] RSP: 002b:00007ffc614ce988 EFLAGS: 00000207 ORIG_RAX: 000000000000002a [ 29.728106] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440c99 [ 29.735349] RDX: 000000000000002e RSI: 000000002014cfd2 RDI: 0000000000000004 [ 29.742587] RBP: 000000000000732d R08: 0000000000000000 R09: 0000000000000000 [ 29.749826] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000000 [ 29.757076] R13: 0000000000000003 R14: 00000000006cf050 R15: 00000000004a264e [ 29.764326] Code: fe ff ff e8 90 d6 5e 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 [ 29.783398] RIP: pppol2tp_connect+0x10a3/0x1dd0 RSP: ffff8801ac5b7af0 [ 29.790051] ---[ end trace 54f5ed3b8e58dc18 ]--- [ 29.794804] Kernel panic - not syncing: Fatal exception [ 29.800534] Dumping ftrace buffer: [ 29.804048] (ftrace buffer empty) [ 29.807726] Kernel Offset: disabled [ 29.811322] Rebooting in 86400 seconds..