[....] Starting enhanced syslogd: rsyslogd[ 15.886201] audit: type=1400 audit(1517594255.129:4): avc: denied { syslog } for pid=3908 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. 2018/02/02 17:57:57 parsed 1 programs 2018/02/02 17:57:57 executed programs: 0 syzkaller login: [ 38.093473] audit: type=1400 audit(1517594277.329:5): avc: denied { sys_admin } for pid=4078 comm="syz-executor0" capability=21 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 38.126642] IPVS: Creating netns size=2536 id=1 [ 38.150992] IPVS: Creating netns size=2536 id=2 [ 38.161757] IPVS: Creating netns size=2536 id=3 [ 38.166777] audit: type=1400 audit(1517594277.409:6): avc: denied { sys_chroot } for pid=4081 comm="syz-executor2" capability=18 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 38.167723] audit: type=1400 audit(1517594277.409:7): avc: denied { net_admin } for pid=4081 comm="syz-executor2" capability=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 38.243362] IPVS: Creating netns size=2536 id=4 [ 38.277767] IPVS: Creating netns size=2536 id=5 [ 38.310526] IPVS: Creating netns size=2536 id=6 [ 38.336533] IPVS: Creating netns size=2536 id=7 [ 38.359709] IPVS: Creating netns size=2536 id=8 2018/02/02 17:58:02 executed programs: 471 2018/02/02 17:58:07 executed programs: 884 [ 51.913352] ================================================================== [ 51.920771] BUG: KASAN: use-after-free in inet_shutdown+0x2d4/0x350 [ 51.927165] Read of size 4 at addr ffff8801cc6c8cc0 by task syz-executor5/13041 [ 51.934582] [ 51.936185] CPU: 0 PID: 13041 Comm: syz-executor5 Not tainted 4.9.79-g71f1469 #34 [ 51.943776] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.953110] ffff8801b3127b78 ffffffff81d94829 ffffea000731b200 ffff8801cc6c8cc0 [ 51.961130] 0000000000000000 ffff8801cc6c8cc0 ffff8801b5a60558 ffff8801b3127bb0 [ 51.969137] ffffffff8153e083 ffff8801cc6c8cc0 0000000000000004 0000000000000000 [ 51.977122] Call Trace: [ 51.979688] [] dump_stack+0xc1/0x128 [ 51.985027] [] print_address_description+0x73/0x280 [ 51.991663] [] kasan_report+0x275/0x360 [ 51.997260] [] ? inet_shutdown+0x2d4/0x350 [ 52.003119] [] ? pppol2tp_recvmsg+0x2b0/0x2b0 [ 52.009236] [] __asan_report_load4_noabort+0x14/0x20 [ 52.015990] [] inet_shutdown+0x2d4/0x350 [ 52.021674] [] ? pppol2tp_recvmsg+0x2b0/0x2b0 [ 52.027791] [] pppol2tp_session_close+0xa0/0xe0 [ 52.034080] [] l2tp_tunnel_closeall+0x21f/0x3a0 [ 52.040372] [] ? udp_v6_flush_pending_frames+0xe0/0xe0 [ 52.047273] [] ? sock_release+0x1e0/0x1e0 [ 52.053044] [] l2tp_udp_encap_destroy+0x87/0xe0 [ 52.059332] [] ? l2tp_tunnel_destruct+0x5a0/0x5a0 [ 52.065800] [] udpv6_destroy_sock+0xb1/0xd0 [ 52.071746] [] sk_common_release+0x6b/0x2f0 [ 52.077691] [] udp_lib_close+0x15/0x20 [ 52.083203] [] inet_release+0xfa/0x1d0 [ 52.088715] [] inet6_release+0x50/0x70 [ 52.094225] [] sock_release+0x8d/0x1e0 [ 52.099737] [] sock_close+0x16/0x20 [ 52.104990] [] __fput+0x28c/0x6e0 [ 52.110070] [] ____fput+0x15/0x20 [ 52.115146] [] task_work_run+0x115/0x190 [ 52.120831] [] exit_to_usermode_loop+0xfc/0x120 [ 52.127124] [] do_fast_syscall_32+0x5de/0x890 [ 52.133240] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.139879] [] entry_SYSENTER_compat+0x74/0x83 [ 52.146078] [ 52.147679] Allocated by task 13021: [ 52.151370] save_stack_trace+0x16/0x20 [ 52.155317] save_stack+0x43/0xd0 [ 52.158756] kasan_kmalloc+0xad/0xe0 [ 52.162443] kasan_slab_alloc+0x12/0x20 [ 52.166386] kmem_cache_alloc+0xba/0x290 [ 52.170423] sock_alloc_inode+0x1d/0x250 [ 52.174455] alloc_inode+0x65/0x180 [ 52.178053] new_inode_pseudo+0x17/0xe0 [ 52.182000] sock_alloc+0x41/0x270 [ 52.185517] __sock_create+0xa5/0x640 [ 52.189303] SyS_socket+0xf0/0x1b0 [ 52.192820] do_fast_syscall_32+0x2f7/0x890 [ 52.197114] entry_SYSENTER_compat+0x74/0x83 [ 52.201582] [ 52.203188] Freed by task 13021: [ 52.206528] save_stack_trace+0x16/0x20 [ 52.210475] save_stack+0x43/0xd0 [ 52.213900] kasan_slab_free+0x72/0xc0 [ 52.217762] kmem_cache_free+0xc7/0x300 [ 52.221712] sock_destroy_inode+0x56/0x70 [ 52.225833] destroy_inode+0xc3/0x120 [ 52.229603] evict+0x329/0x4f0 [ 52.232772] iput+0x47b/0x900 [ 52.235849] dentry_unlink_inode+0x470/0x570 [ 52.240226] __dentry_kill+0x25b/0x480 [ 52.244084] dput.part.23+0x680/0x7b0 [ 52.247865] dput+0x1f/0x30 [ 52.250787] __fput+0x46a/0x6e0 [ 52.254037] ____fput+0x15/0x20 [ 52.257290] task_work_run+0x115/0x190 [ 52.261149] exit_to_usermode_loop+0xfc/0x120 [ 52.265614] do_fast_syscall_32+0x5de/0x890 [ 52.269907] entry_SYSENTER_compat+0x74/0x83 [ 52.274282] [ 52.275883] The buggy address belongs to the object at ffff8801cc6c8cc0 [ 52.275883] which belongs to the cache sock_inode_cache of size 944 [ 52.288944] The buggy address is located 0 bytes inside of [ 52.288944] 944-byte region [ffff8801cc6c8cc0, ffff8801cc6c9070) [ 52.300613] The buggy address belongs to the page: [ 52.305516] page:ffffea000731b200 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 52.315688] flags: 0x8000000000004080(slab|head) [ 52.320413] page dumped because: kasan: bad access detected [ 52.326090] [ 52.327690] Memory state around the buggy address: [ 52.332591] ffff8801cc6c8b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.339922] ffff8801cc6c8c00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc [ 52.347254] >ffff8801cc6c8c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 52.354583] ^ [ 52.360005] ffff8801cc6c8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.367338] ffff8801cc6c8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.374839] ================================================================== [ 52.382174] Disabling lock debugging due to kernel taint [ 52.443618] Kernel panic - not syncing: panic_on_warn set ... [ 52.443618] [ 52.451032] CPU: 0 PID: 13041 Comm: syz-executor5 Tainted: G B 4.9.79-g71f1469 #34 [ 52.459859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.469208] ffff8801b3127ad0 ffffffff81d94829 ffffffff8419709f ffff8801b3127ba8 [ 52.477247] 0000000000000000 ffff8801cc6c8cc0 ffff8801b5a60558 ffff8801b3127b98 [ 52.485321] ffffffff8142f531 0000000041b58ab3 ffffffff8418ab10 ffffffff8142f375 [ 52.493378] Call Trace: [ 52.495961] [] dump_stack+0xc1/0x128 [ 52.501319] [] panic+0x1bc/0x3a8 [ 52.506333] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 52.514564] [] ? preempt_schedule+0x25/0x30 [ 52.520530] [] ? ___preempt_schedule+0x16/0x18 [ 52.526761] [] kasan_end_report+0x50/0x50 [ 52.532561] [] kasan_report+0x167/0x360 [ 52.538178] [] ? inet_shutdown+0x2d4/0x350 [ 52.544039] [] ? pppol2tp_recvmsg+0x2b0/0x2b0 [ 52.550160] [] __asan_report_load4_noabort+0x14/0x20 [ 52.556884] [] inet_shutdown+0x2d4/0x350 [ 52.562566] [] ? pppol2tp_recvmsg+0x2b0/0x2b0 [ 52.568678] [] pppol2tp_session_close+0xa0/0xe0 [ 52.574966] [] l2tp_tunnel_closeall+0x21f/0x3a0 [ 52.581257] [] ? udp_v6_flush_pending_frames+0xe0/0xe0 [ 52.588167] [] ? sock_release+0x1e0/0x1e0 [ 52.593934] [] l2tp_udp_encap_destroy+0x87/0xe0 [ 52.600228] [] ? l2tp_tunnel_destruct+0x5a0/0x5a0 [ 52.606702] [] udpv6_destroy_sock+0xb1/0xd0 [ 52.612651] [] sk_common_release+0x6b/0x2f0 [ 52.618680] [] udp_lib_close+0x15/0x20 [ 52.624187] [] inet_release+0xfa/0x1d0 [ 52.629694] [] inet6_release+0x50/0x70 [ 52.635201] [] sock_release+0x8d/0x1e0 [ 52.640707] [] sock_close+0x16/0x20 [ 52.645956] [] __fput+0x28c/0x6e0 [ 52.651028] [] ____fput+0x15/0x20 [ 52.656102] [] task_work_run+0x115/0x190 [ 52.661781] [] exit_to_usermode_loop+0xfc/0x120 [ 52.668079] [] do_fast_syscall_32+0x5de/0x890 [ 52.674196] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.680834] [] entry_SYSENTER_compat+0x74/0x83 [ 52.687499] Dumping ftrace buffer: [ 52.691019] (ftrace buffer empty) [ 52.694698] Kernel Offset: disabled [ 52.698305] Rebooting in 86400 seconds..