2017/09/05 15:20:46 parsed 1 programs 2017/09/05 15:20:46 executed programs: 0 syzkaller login: [ 30.078937] dev_remove_pack: ffff8800390f9480 not found [ 30.092244] ================================================================== [ 30.092909] BUG: KASAN: use-after-free in __dev_remove_pack+0x305/0x3b0 [ 30.093518] Read of size 8 at addr ffff88003ac51628 by task syz-executor0/3044 [ 30.094102] [ 30.094225] CPU: 0 PID: 3044 Comm: syz-executor0 Not tainted 4.13.0-next-20170905+ #15 [ 30.094927] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 30.095716] Call Trace: [ 30.095955] dump_stack+0x194/0x257 [ 30.096393] ? arch_local_irq_restore+0x53/0x53 [ 30.096817] ? show_regs_print_info+0x65/0x65 [ 30.097230] ? __dev_remove_pack+0x305/0x3b0 [ 30.097621] print_address_description+0x73/0x250 [ 30.097999] ? __dev_remove_pack+0x305/0x3b0 [ 30.098400] kasan_report+0x24e/0x340 [ 30.098751] __asan_report_load8_noabort+0x14/0x20 [ 30.099201] __dev_remove_pack+0x305/0x3b0 [ 30.099588] ? dev_get_by_name_rcu+0x270/0x270 [ 30.100005] ? refcount_sub_and_test+0x115/0x1b0 [ 30.100447] __unregister_prot_hook+0x211/0x280 [ 30.100898] packet_release+0x8bb/0xd70 [ 30.101266] ? packet_set_ring+0x1b70/0x1b70 [ 30.101673] ? dentry_free+0xcd/0x130 [ 30.102020] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.102478] ? kmem_cache_free+0x249/0x280 [ 30.102864] ? dentry_free+0xd2/0x130 [ 30.103240] ? locks_remove_file+0x3fa/0x5a0 [ 30.103618] ? fcntl_setlk+0x10d0/0x10d0 [ 30.104305] ? __fsnotify_parent+0xb4/0x3a0 [ 30.104729] ? fsnotify+0x1af0/0x1af0 [ 30.105082] sock_release+0x8d/0x1e0 [ 30.105447] ? sock_release+0x8d/0x1e0 [ 30.105813] ? sock_release+0x1e0/0x1e0 [ 30.106177] sock_close+0x16/0x20 [ 30.106495] __fput+0x333/0x7f0 [ 30.106851] ? fput+0x140/0x140 [ 30.107156] ? check_same_owner+0x320/0x320 [ 30.107550] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.107965] ____fput+0x15/0x20 [ 30.108270] task_work_run+0x199/0x270 [ 30.108631] ? task_work_cancel+0x210/0x210 [ 30.109028] ? _raw_spin_unlock+0x22/0x30 [ 30.109460] ? switch_task_namespaces+0x87/0xc0 [ 30.109921] do_exit+0xa52/0x1b40 [ 30.110236] ? plist_check_list+0xa0/0xa0 [ 30.110623] ? plist_del+0x47b/0x990 [ 30.110964] ? mm_update_next_owner+0x930/0x930 [ 30.111400] ? plist_add+0x760/0x760 [ 30.111710] ? check_same_owner+0x320/0x320 [ 30.112099] ? find_held_lock+0x39/0x1d0 [ 30.112479] ? check_noncircular+0x20/0x20 [ 30.112868] ? lock_downgrade+0x990/0x990 [ 30.113248] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 30.113645] ? find_held_lock+0x39/0x1d0 [ 30.114052] ? lock_downgrade+0x990/0x990 [ 30.114431] ? recalc_sigpending_tsk+0x117/0x150 [ 30.114864] ? recalc_sigpending+0x103/0x160 [ 30.115306] ? recalc_sigpending_tsk+0x150/0x150 [ 30.115746] ? get_signal+0x397/0x17e0 [ 30.116110] do_group_exit+0x149/0x400 [ 30.116466] ? __lock_is_held+0xbc/0x140 [ 30.116837] ? SyS_exit+0x30/0x30 [ 30.117166] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.117620] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.118072] get_signal+0x7e8/0x17e0 [ 30.118431] ? ptrace_notify+0x130/0x130 [ 30.118790] ? __fget+0xbb/0x580 [ 30.119107] ? lock_release+0xd70/0xd70 [ 30.119475] ? exit_robust_list+0x240/0x240 [ 30.119891] do_signal+0x94/0x1ee0 [ 30.120356] ? iterate_fd+0x3f0/0x3f0 [ 30.120707] ? up_read+0x1a/0x40 [ 30.121050] ? setup_sigcontext+0x7d0/0x7d0 [ 30.121480] ? __do_page_fault+0xb60/0xb60 [ 30.121877] ? __fget_light+0x29d/0x390 [ 30.122242] ? selinux_tun_dev_create+0xc0/0xc0 [ 30.122668] ? selinux_netlbl_socket_setsockopt+0x10c/0x460 [ 30.123190] ? selinux_netlbl_sock_rcv_skb+0x730/0x730 [ 30.123670] ? exit_to_usermode_loop+0x98/0x300 [ 30.124105] exit_to_usermode_loop+0x224/0x300 [ 30.124527] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 30.125063] syscall_return_slowpath+0x42f/0x500 [ 30.125526] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 30.125991] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 30.126444] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.127164] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.127604] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 30.128039] RIP: 0033:0x447299 [ 30.128345] RSP: 002b:00007fd885caccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 30.129040] RAX: fffffffffffffe00 RBX: 0000000000708028 RCX: 0000000000447299 [ 30.129708] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708028 [ 30.130358] RBP: 0000000000708000 R08: 0000000000000000 R09: 0000000000000000 [ 30.131008] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 30.131680] R13: 0000000000000000 R14: 00007fd885cad9c0 R15: 00007fd885cad700 [ 30.132366] [ 30.132518] Allocated by task 3044: [ 30.132846] save_stack_trace+0x16/0x20 [ 30.133245] save_stack+0x43/0xd0 [ 30.133579] kasan_kmalloc+0xad/0xe0 [ 30.133921] kmem_cache_alloc_trace+0x136/0x750 [ 30.134341] fanout_add+0xa50/0x1190 [ 30.134678] packet_setsockopt+0xfdc/0x1e80 [ 30.135066] SyS_setsockopt+0x189/0x360 [ 30.135433] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 30.135860] [ 30.136011] Freed by task 3044: [ 30.136309] save_stack_trace+0x16/0x20 [ 30.136673] save_stack+0x43/0xd0 [ 30.136993] kasan_slab_free+0x71/0xc0 [ 30.137346] kfree+0xca/0x250 [ 30.137636] packet_release+0xa8f/0xd70 [ 30.138000] sock_release+0x8d/0x1e0 [ 30.138337] sock_close+0x16/0x20 [ 30.138655] __fput+0x333/0x7f0 [ 30.138956] ____fput+0x15/0x20 [ 30.139256] task_work_run+0x199/0x270 [ 30.139606] do_exit+0xa52/0x1b40 [ 30.139920] do_group_exit+0x149/0x400 [ 30.140280] get_signal+0x7e8/0x17e0 [ 30.140617] do_signal+0x94/0x1ee0 [ 30.140939] exit_to_usermode_loop+0x224/0x300 [ 30.141356] syscall_return_slowpath+0x42f/0x500 [ 30.141790] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 30.142214] [ 30.142365] The buggy address belongs to the object at ffff88003ac50d80 [ 30.142365] which belongs to the cache kmalloc-4096 of size 4096 [ 30.143496] The buggy address is located 2216 bytes inside of [ 30.143496] 4096-byte region [ffff88003ac50d80, ffff88003ac51d80) [ 30.144561] The buggy address belongs to the page: [ 30.145001] page:ffffea0000eb1400 count:1 mapcount:0 mapping:ffff88003ac50d80 index:0x0 compound_mapcount: 0 [ 30.145910] flags: 0x100000000008100(slab|head) [ 30.146333] raw: 0100000000008100 ffff88003ac50d80 0000000000000000 0000000100000001 [ 30.147040] raw: ffffea0000e4bd20 ffff88003e801a50 ffff88003e800dc0 0000000000000000 [ 30.147999] page dumped because: kasan: bad access detected [ 30.148509] [ 30.148658] Memory state around the buggy address: [ 30.149112] ffff88003ac51500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.149778] ffff88003ac51580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.150444] >ffff88003ac51600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.151102] ^ [ 30.151525] ffff88003ac51680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.152212] ffff88003ac51700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.152866] ================================================================== [ 30.153529] Disabling lock debugging due to kernel taint [ 30.154061] Kernel panic - not syncing: panic_on_warn set ... [ 30.154061] [ 30.154713] CPU: 0 PID: 3044 Comm: syz-executor0 Tainted: G B 4.13.0-next-20170905+ #15 [ 30.155565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 30.156314] Call Trace: [ 30.156560] dump_stack+0x194/0x257 [ 30.156898] ? arch_local_irq_restore+0x53/0x53 [ 30.157338] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.157788] ? __dev_remove_pack+0x2e0/0x3b0 [ 30.158198] panic+0x1e4/0x417 [ 30.158500] ? __warn+0x1d9/0x1d9 [ 30.158830] ? __dev_remove_pack+0x305/0x3b0 [ 30.159239] kasan_end_report+0x50/0x50 [ 30.159610] kasan_report+0x137/0x340 [ 30.159967] __asan_report_load8_noabort+0x14/0x20 [ 30.160453] __dev_remove_pack+0x305/0x3b0 [ 30.160844] ? dev_get_by_name_rcu+0x270/0x270 [ 30.161255] ? refcount_sub_and_test+0x115/0x1b0 [ 30.161698] __unregister_prot_hook+0x211/0x280 [ 30.162115] packet_release+0x8bb/0xd70 [ 30.162477] ? packet_set_ring+0x1b70/0x1b70 [ 30.162870] ? dentry_free+0xcd/0x130 [ 30.163213] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.163663] ? kmem_cache_free+0x249/0x280 [ 30.164043] ? dentry_free+0xd2/0x130 [ 30.164388] ? locks_remove_file+0x3fa/0x5a0 [ 30.164784] ? fcntl_setlk+0x10d0/0x10d0 [ 30.165153] ? __fsnotify_parent+0xb4/0x3a0 [ 30.165769] ? fsnotify+0x1af0/0x1af0 [ 30.166429] sock_release+0x8d/0x1e0 [ 30.167096] ? sock_release+0x8d/0x1e0 [ 30.167854] ? sock_release+0x1e0/0x1e0 [ 30.168225] sock_close+0x16/0x20 [ 30.168540] __fput+0x333/0x7f0 [ 30.168840] ? fput+0x140/0x140 [ 30.169143] ? check_same_owner+0x320/0x320 [ 30.169527] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.169950] ____fput+0x15/0x20 [ 30.170256] task_work_run+0x199/0x270 [ 30.170603] ? task_work_cancel+0x210/0x210 [ 30.170996] ? _raw_spin_unlock+0x22/0x30 [ 30.171379] ? switch_task_namespaces+0x87/0xc0 [ 30.171796] do_exit+0xa52/0x1b40 [ 30.172107] ? plist_check_list+0xa0/0xa0 [ 30.172496] ? plist_del+0x47b/0x990 [ 30.172828] ? mm_update_next_owner+0x930/0x930 [ 30.173250] ? plist_add+0x760/0x760 [ 30.173589] ? check_same_owner+0x320/0x320 [ 30.173982] ? find_held_lock+0x39/0x1d0 [ 30.174351] ? check_noncircular+0x20/0x20 [ 30.174729] ? lock_downgrade+0x990/0x990 [ 30.175104] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 30.175591] ? find_held_lock+0x39/0x1d0 [ 30.175959] ? lock_downgrade+0x990/0x990 [ 30.176398] ? recalc_sigpending_tsk+0x117/0x150 [ 30.176826] ? recalc_sigpending+0x103/0x160 [ 30.177226] ? recalc_sigpending_tsk+0x150/0x150 [ 30.177666] ? get_signal+0x397/0x17e0 [ 30.178025] do_group_exit+0x149/0x400 [ 30.178384] ? __lock_is_held+0xbc/0x140 [ 30.178750] ? SyS_exit+0x30/0x30 [ 30.179063] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.179470] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.179923] get_signal+0x7e8/0x17e0 [ 30.180273] ? ptrace_notify+0x130/0x130 [ 30.180660] ? __fget+0xbb/0x580 [ 30.180967] ? lock_release+0xd70/0xd70 [ 30.181330] ? exit_robust_list+0x240/0x240 [ 30.181738] do_signal+0x94/0x1ee0 [ 30.182062] ? iterate_fd+0x3f0/0x3f0 [ 30.182404] ? up_read+0x1a/0x40 [ 30.182713] ? setup_sigcontext+0x7d0/0x7d0 [ 30.183109] ? __do_page_fault+0xb60/0xb60 [ 30.183495] ? __fget_light+0x29d/0x390 [ 30.183859] ? selinux_tun_dev_create+0xc0/0xc0 [ 30.184281] ? selinux_netlbl_socket_setsockopt+0x10c/0x460 [ 30.184796] ? selinux_netlbl_sock_rcv_skb+0x730/0x730 [ 30.185271] ? exit_to_usermode_loop+0x98/0x300 [ 30.185701] exit_to_usermode_loop+0x224/0x300 [ 30.186114] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 30.186618] syscall_return_slowpath+0x42f/0x500 [ 30.187046] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 30.187498] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 30.187945] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.188398] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.189163] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 30.189591] RIP: 0033:0x447299 [ 30.189908] RSP: 002b:00007fd885caccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 30.190608] RAX: fffffffffffffe00 RBX: 0000000000708028 RCX: 0000000000447299 [ 30.191258] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708028 [ 30.191906] RBP: 0000000000708000 R08: 0000000000000000 R09: 0000000000000000 [ 30.192552] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 30.193256] R13: 0000000000000000 R14: 00007fd885cad9c0 R15: 00007fd885cad700 [ 30.193972] Dumping ftrace buffer: [ 30.194295] (ftrace buffer empty) [ 30.194629] Kernel Offset: disabled [ 30.194954] Rebooting in 86400 seconds..