INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-next-kasan-gce-7,10.128.0.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 52.889223] ================================================================== [ 52.890305] BUG: KASAN: use-after-free in tipc_group_self+0x1a2/0x1b0 [ 52.891184] Read of size 4 at addr ffff8801d8a6126c by task syzkaller664155/2989 [ 52.892168] [ 52.892401] CPU: 0 PID: 2989 Comm: syzkaller664155 Not tainted 4.14.0-rc5-next-20171018+ #36 [ 52.893537] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.894756] Call Trace: [ 52.895116] dump_stack+0x194/0x257 [ 52.895609] ? arch_local_irq_restore+0x53/0x53 [ 52.896231] ? show_regs_print_info+0x65/0x65 [ 52.896837] ? tipc_group_self+0x1a2/0x1b0 [ 52.897419] print_address_description+0x73/0x250 [ 52.898063] ? tipc_group_self+0x1a2/0x1b0 [ 52.898631] kasan_report+0x25b/0x340 [ 52.899164] __asan_report_load4_noabort+0x14/0x20 [ 52.899821] tipc_group_self+0x1a2/0x1b0 [ 52.900370] tipc_sk_leave+0xfc/0x200 [ 52.900904] ? tipc_sk_withdraw+0x6b0/0x6b0 [ 52.901505] ? __local_bh_enable_ip+0x9d/0x160 [ 52.902120] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 52.902791] ? lock_sock_nested+0x91/0x110 [ 52.903357] ? trace_hardirqs_on+0xd/0x10 [ 52.903914] ? __local_bh_enable_ip+0x9d/0x160 [ 52.904530] tipc_release+0x154/0xfe0 [ 52.905054] ? mntput_no_expire+0x130/0xa90 [ 52.905635] ? tipc_sk_backlog_rcv+0x370/0x370 [ 52.906247] ? lock_release+0xa40/0xa40 [ 52.906781] ? dentry_free+0xcd/0x130 [ 52.907335] ? rcu_read_lock_sched_held+0x108/0x120 [ 52.908002] ? kmem_cache_free+0x249/0x280 [ 52.908589] ? dentry_free+0xd2/0x130 [ 52.909103] ? locks_remove_file+0x3fa/0x5a0 [ 52.911834] ? fcntl_setlk+0x10c0/0x10c0 [ 52.915866] ? __fsnotify_parent+0xb4/0x3a0 [ 52.920159] ? fsnotify+0x1af0/0x1af0 [ 52.923929] ? rcu_note_context_switch+0x710/0x710 [ 52.928832] sock_release+0x8d/0x1e0 [ 52.932515] ? sock_release+0x1e0/0x1e0 [ 52.936455] sock_close+0x16/0x20 [ 52.939877] __fput+0x327/0x7e0 [ 52.943131] ? fput+0x140/0x140 [ 52.946380] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 52.952229] ? _raw_spin_unlock_irq+0x27/0x70 [ 52.956697] ____fput+0x15/0x20 [ 52.959945] task_work_run+0x199/0x270 [ 52.963804] ? task_work_cancel+0x210/0x210 [ 52.968094] ? _raw_spin_unlock+0x22/0x30 [ 52.972210] ? switch_task_namespaces+0x87/0xc0 [ 52.976849] do_exit+0x9b5/0x1ad0 [ 52.980275] ? mm_update_next_owner+0x930/0x930 [ 52.984910] ? reacquire_held_locks+0x1fd/0x3d0 [ 52.989550] ? find_held_lock+0x35/0x1d0 [ 52.993584] ? release_sock+0x1d4/0x2a0 [ 52.997524] ? lock_downgrade+0x990/0x990 [ 53.001638] ? lock_downgrade+0x990/0x990 [ 53.005756] ? do_raw_spin_trylock+0x190/0x190 [ 53.010308] ? tipc_group_delete+0x2c0/0x3c0 [ 53.014685] ? __local_bh_enable_ip+0x9d/0x160 [ 53.019236] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.024220] ? trace_hardirqs_on+0xd/0x10 [ 53.028334] ? __local_bh_enable_ip+0x9d/0x160 [ 53.032893] ? release_sock+0x1d4/0x2a0 [ 53.036839] ? tipc_nametbl_build_group+0x27a/0x370 [ 53.041831] ? tipc_setsockopt+0x703/0xc00 [ 53.046042] ? tipc_sk_leave+0x200/0x200 [ 53.050080] ? security_socket_setsockopt+0x89/0xb0 [ 53.055066] ? SyS_setsockopt+0x215/0x360 [ 53.059186] do_group_exit+0x149/0x400 [ 53.063041] ? SyS_recv+0x40/0x40 [ 53.066465] ? SyS_exit+0x30/0x30 [ 53.069884] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.074868] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.079593] SyS_exit_group+0x1d/0x20 [ 53.083361] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.088083] RIP: 0033:0x43e978 [ 53.091240] RSP: 002b:00007ffc4e82cc28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 53.098913] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e978 [ 53.106149] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 53.113387] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 53.120622] R10: 000000002010e000 R11: 0000000000000246 R12: 00000000006ca858 [ 53.127858] R13: 00000000006ca858 R14: 0000000000000000 R15: 0000000000002710 [ 53.135112] [ 53.136708] Allocated by task 2989: [ 53.140300] save_stack+0x43/0xd0 [ 53.143718] kasan_kmalloc+0xad/0xe0 [ 53.147395] kmem_cache_alloc_trace+0x136/0x750 [ 53.152029] tipc_group_create+0x116/0x9c0 [ 53.156228] tipc_setsockopt+0x25e/0xc00 [ 53.160252] SyS_setsockopt+0x189/0x360 [ 53.164190] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.168909] [ 53.170502] Freed by task 2989: [ 53.173745] save_stack+0x43/0xd0 [ 53.177162] kasan_slab_free+0x71/0xc0 [ 53.181015] kfree+0xca/0x250 [ 53.184085] tipc_group_delete+0x2c0/0x3c0 [ 53.188285] tipc_setsockopt+0xb33/0xc00 [ 53.192313] SyS_setsockopt+0x189/0x360 [ 53.196251] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.200968] [ 53.202563] The buggy address belongs to the object at ffff8801d8a61200 [ 53.202563] which belongs to the cache kmalloc-192 of size 192 [ 53.215193] The buggy address is located 108 bytes inside of [ 53.215193] 192-byte region [ffff8801d8a61200, ffff8801d8a612c0) [ 53.227031] The buggy address belongs to the page: [ 53.231926] page:ffffea0007629840 count:1 mapcount:0 mapping:ffff8801d8a61000 index:0xffff8801d8a61300 [ 53.241338] flags: 0x200000000000100(slab) [ 53.245538] raw: 0200000000000100 ffff8801d8a61000 ffff8801d8a61300 000000010000000f [ 53.253383] raw: ffffea0007593e20 ffff8801dac01138 ffff8801dac00040 0000000000000000 [ 53.261226] page dumped because: kasan: bad access detected [ 53.266898] [ 53.268490] Memory state around the buggy address: [ 53.273387] ffff8801d8a61100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.280711] ffff8801d8a61180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 53.288036] >ffff8801d8a61200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.295358] ^ [ 53.302077] ffff8801d8a61280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 53.309401] ffff8801d8a61300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.316723] ================================================================== [ 53.324048] Disabling lock debugging due to kernel taint [ 53.329514] Kernel panic - not syncing: panic_on_warn set ... [ 53.329514] [ 53.336849] CPU: 0 PID: 2989 Comm: syzkaller664155 Tainted: G B 4.14.0-rc5-next-20171018+ #36 [ 53.346691] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.356010] Call Trace: [ 53.358565] dump_stack+0x194/0x257 [ 53.362160] ? arch_local_irq_restore+0x53/0x53 [ 53.366794] ? kasan_end_report+0x32/0x50 [ 53.370910] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.375632] ? vsnprintf+0x1ed/0x1900 [ 53.379397] ? tipc_group_self+0xb0/0x1b0 [ 53.383509] panic+0x1e4/0x41c [ 53.386667] ? refcount_error_report+0x214/0x214 [ 53.391388] ? add_taint+0x1c/0x50 [ 53.394893] ? add_taint+0x1c/0x50 [ 53.398398] ? tipc_group_self+0x1a2/0x1b0 [ 53.402598] kasan_end_report+0x50/0x50 [ 53.406538] kasan_report+0x144/0x340 [ 53.410306] __asan_report_load4_noabort+0x14/0x20 [ 53.415199] tipc_group_self+0x1a2/0x1b0 [ 53.419224] tipc_sk_leave+0xfc/0x200 [ 53.422995] ? tipc_sk_withdraw+0x6b0/0x6b0 [ 53.427281] ? __local_bh_enable_ip+0x9d/0x160 [ 53.431828] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.436810] ? lock_sock_nested+0x91/0x110 [ 53.441008] ? trace_hardirqs_on+0xd/0x10 [ 53.445121] ? __local_bh_enable_ip+0x9d/0x160 [ 53.449672] tipc_release+0x154/0xfe0 [ 53.453441] ? mntput_no_expire+0x130/0xa90 [ 53.457727] ? tipc_sk_backlog_rcv+0x370/0x370 [ 53.462275] ? lock_release+0xa40/0xa40 [ 53.466214] ? dentry_free+0xcd/0x130 [ 53.469979] ? rcu_read_lock_sched_held+0x108/0x120 [ 53.474962] ? kmem_cache_free+0x249/0x280 [ 53.479161] ? dentry_free+0xd2/0x130 [ 53.482930] ? locks_remove_file+0x3fa/0x5a0 [ 53.487303] ? fcntl_setlk+0x10c0/0x10c0 [ 53.491330] ? __fsnotify_parent+0xb4/0x3a0 [ 53.495617] ? fsnotify+0x1af0/0x1af0 [ 53.499382] ? rcu_note_context_switch+0x710/0x710 [ 53.504278] sock_release+0x8d/0x1e0 [ 53.507957] ? sock_release+0x1e0/0x1e0 [ 53.511895] sock_close+0x16/0x20 [ 53.515313] __fput+0x327/0x7e0 [ 53.518560] ? fput+0x140/0x140 [ 53.521808] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 53.527656] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.532122] ____fput+0x15/0x20 [ 53.535366] task_work_run+0x199/0x270 [ 53.539219] ? task_work_cancel+0x210/0x210 [ 53.543504] ? _raw_spin_unlock+0x22/0x30 [ 53.547799] ? switch_task_namespaces+0x87/0xc0 [ 53.552434] do_exit+0x9b5/0x1ad0 [ 53.555860] ? mm_update_next_owner+0x930/0x930 [ 53.560496] ? reacquire_held_locks+0x1fd/0x3d0 [ 53.565132] ? find_held_lock+0x35/0x1d0 [ 53.569163] ? release_sock+0x1d4/0x2a0 [ 53.573101] ? lock_downgrade+0x990/0x990 [ 53.577213] ? lock_downgrade+0x990/0x990 [ 53.581326] ? do_raw_spin_trylock+0x190/0x190 [ 53.585875] ? tipc_group_delete+0x2c0/0x3c0 [ 53.590246] ? __local_bh_enable_ip+0x9d/0x160 [ 53.594792] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.599772] ? trace_hardirqs_on+0xd/0x10 [ 53.603883] ? __local_bh_enable_ip+0x9d/0x160 [ 53.608430] ? release_sock+0x1d4/0x2a0 [ 53.612371] ? tipc_nametbl_build_group+0x27a/0x370 [ 53.617617] ? tipc_setsockopt+0x703/0xc00 [ 53.621817] ? tipc_sk_leave+0x200/0x200 [ 53.625848] ? security_socket_setsockopt+0x89/0xb0 [ 53.630830] ? SyS_setsockopt+0x215/0x360 [ 53.634945] do_group_exit+0x149/0x400 [ 53.638797] ? SyS_recv+0x40/0x40 [ 53.642217] ? SyS_exit+0x30/0x30 [ 53.645634] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.650633] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.655355] SyS_exit_group+0x1d/0x20 [ 53.659122] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.663840] RIP: 0033:0x43e978 [ 53.666994] RSP: 002b:00007ffc4e82cc28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 53.674665] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e978 [ 53.681899] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 53.689132] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 53.696368] R10: 000000002010e000 R11: 0000000000000246 R12: 00000000006ca858 [ 53.703603] R13: 00000000006ca858 R14: 0000000000000000 R15: 0000000000002710 [ 53.710882] Dumping ftrace buffer: [ 53.714385] (ftrace buffer empty) [ 53.718061] Kernel Offset: disabled [ 53.721653] Rebooting in 86400 seconds..