2017/09/07 09:00:56 parsed 1 programs 2017/09/07 09:00:56 executed programs: 0 syzkaller login: [ 47.990709] dev_remove_pack: ffff88003a71bec0 not found [ 48.011546] ================================================================== [ 48.012247] BUG: KASAN: use-after-free in __dev_remove_pack+0x305/0x3b0 [ 48.012853] Read of size 8 at addr ffff88006b86b1a8 by task syz-executor0/2986 [ 48.013504] [ 48.013664] CPU: 2 PID: 2986 Comm: syz-executor0 Not tainted 4.13.0-next-20170907+ #17 [ 48.014386] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 48.015109] Call Trace: [ 48.015360] dump_stack+0x194/0x257 [ 48.015694] ? arch_local_irq_restore+0x53/0x53 [ 48.016115] ? show_regs_print_info+0x65/0x65 [ 48.016530] ? __dev_remove_pack+0x305/0x3b0 [ 48.016932] print_address_description+0x73/0x250 [ 48.017368] ? __dev_remove_pack+0x305/0x3b0 [ 48.017770] kasan_report+0x24e/0x340 [ 48.018126] __asan_report_load8_noabort+0x14/0x20 [ 48.018575] __dev_remove_pack+0x305/0x3b0 [ 48.018969] ? dev_get_by_name_rcu+0x270/0x270 [ 48.019532] ? refcount_sub_and_test+0x115/0x1b0 [ 48.020058] __unregister_prot_hook+0x211/0x280 [ 48.020535] packet_release+0x8bb/0xd70 [ 48.020932] ? packet_set_ring+0x1b70/0x1b70 [ 48.022331] ? dentry_free+0xcd/0x130 [ 48.022785] ? rcu_read_lock_sched_held+0x108/0x120 [ 48.023377] ? kmem_cache_free+0x249/0x280 [ 48.023833] ? dentry_free+0xd2/0x130 [ 48.028096] ? locks_remove_file+0x3fa/0x5a0 [ 48.028664] ? fcntl_setlk+0x10d0/0x10d0 [ 48.029130] ? __fsnotify_parent+0xb4/0x3a0 [ 48.029650] ? fsnotify+0x1af0/0x1af0 [ 48.030068] sock_release+0x8d/0x1e0 [ 48.030506] ? sock_release+0x8d/0x1e0 [ 48.030922] ? sock_release+0x1e0/0x1e0 [ 48.031378] sock_close+0x16/0x20 [ 48.031749] __fput+0x333/0x7f0 [ 48.034029] ? fput+0x140/0x140 [ 48.034394] ? check_same_owner+0x320/0x320 [ 48.034847] ? _raw_spin_unlock_irq+0x27/0x70 [ 48.035341] ____fput+0x15/0x20 [ 48.035700] task_work_run+0x199/0x270 [ 48.036369] ? task_work_cancel+0x210/0x210 [ 48.036832] ? _raw_spin_unlock+0x22/0x30 [ 48.037270] ? switch_task_namespaces+0x87/0xc0 [ 48.037777] do_exit+0xa52/0x1b40 [ 48.038137] ? plist_check_list+0xa0/0xa0 [ 48.038594] ? plist_del+0x47b/0x990 [ 48.038946] ? mm_update_next_owner+0x930/0x930 [ 48.039476] ? plist_add+0x760/0x760 [ 48.040057] ? check_same_owner+0x320/0x320 [ 48.040616] ? find_held_lock+0x39/0x1d0 [ 48.041262] ? check_noncircular+0x20/0x20 [ 48.042402] ? lock_downgrade+0x990/0x990 [ 48.042800] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 48.043369] ? find_held_lock+0x39/0x1d0 [ 48.043767] ? lock_downgrade+0x990/0x990 [ 48.044164] ? recalc_sigpending_tsk+0x117/0x150 [ 48.044685] ? recalc_sigpending+0x103/0x160 [ 48.045104] ? recalc_sigpending_tsk+0x150/0x150 [ 48.045559] ? get_signal+0x397/0x17e0 [ 48.045938] do_group_exit+0x149/0x400 [ 48.046311] ? __lock_is_held+0xbc/0x140 [ 48.046720] ? SyS_exit+0x30/0x30 [ 48.047061] ? _raw_spin_unlock_irq+0x27/0x70 [ 48.047508] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 48.048001] get_signal+0x7e8/0x17e0 [ 48.048387] ? ptrace_notify+0x130/0x130 [ 48.048785] ? __fget+0xbb/0x580 [ 48.049122] ? lock_release+0xd70/0xd70 [ 48.049520] ? exit_robust_list+0x240/0x240 [ 48.049952] do_signal+0x94/0x1ee0 [ 48.050309] ? iterate_fd+0x3f0/0x3f0 [ 48.050682] ? up_read+0x1a/0x40 [ 48.051017] ? setup_sigcontext+0x7d0/0x7d0 [ 48.051457] ? __do_page_fault+0xb60/0xb60 [ 48.051874] ? __fget_light+0x29d/0x390 [ 48.052268] ? selinux_tun_dev_create+0xc0/0xc0 [ 48.052728] ? selinux_netlbl_socket_setsockopt+0x10c/0x460 [ 48.053280] ? selinux_netlbl_sock_rcv_skb+0x730/0x730 [ 48.053793] ? exit_to_usermode_loop+0x98/0x300 [ 48.054253] exit_to_usermode_loop+0x224/0x300 [ 48.054701] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 48.055252] syscall_return_slowpath+0x42f/0x500 [ 48.055750] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 48.056281] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 48.056790] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 48.057285] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.057753] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 48.058217] RIP: 0033:0x447299 [ 48.058527] RSP: 002b:00007f4e74eedcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 48.059277] RAX: fffffffffffffe00 RBX: 0000000000708028 RCX: 0000000000447299 [ 48.059966] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708028 [ 48.060661] RBP: 0000000000708000 R08: 0000000000000000 R09: 0000000000000000 [ 48.061356] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 48.062054] R13: 0000000000000000 R14: 00007f4e74eee9c0 R15: 00007f4e74eee700 [ 48.062764] [ 48.062928] Allocated by task 2986: [ 48.063290] save_stack_trace+0x16/0x20 [ 48.063649] save_stack+0x43/0xd0 [ 48.064207] kasan_kmalloc+0xad/0xe0 [ 48.064531] kmem_cache_alloc_trace+0x136/0x750 [ 48.064973] fanout_add+0xa50/0x1190 [ 48.065308] packet_setsockopt+0xfdc/0x1e80 [ 48.065785] SyS_setsockopt+0x189/0x360 [ 48.066138] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.066804] [ 48.066985] Freed by task 2986: [ 48.067341] save_stack_trace+0x16/0x20 [ 48.067778] save_stack+0x43/0xd0 [ 48.068165] kasan_slab_free+0x71/0xc0 [ 48.068572] kfree+0xca/0x250 [ 48.068887] packet_release+0xa8f/0xd70 [ 48.069320] sock_release+0x8d/0x1e0 [ 48.069688] sock_close+0x16/0x20 [ 48.070037] __fput+0x333/0x7f0 [ 48.070416] ____fput+0x15/0x20 [ 48.070812] task_work_run+0x199/0x270 [ 48.071275] do_exit+0xa52/0x1b40 [ 48.071692] do_group_exit+0x149/0x400 [ 48.072125] get_signal+0x7e8/0x17e0 [ 48.072527] do_signal+0x94/0x1ee0 [ 48.072895] exit_to_usermode_loop+0x224/0x300 [ 48.073368] syscall_return_slowpath+0x42f/0x500 [ 48.073889] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 48.074375] [ 48.074552] The buggy address belongs to the object at ffff88006b86a900 [ 48.074552] which belongs to the cache kmalloc-4096 of size 4096 [ 48.075887] The buggy address is located 2216 bytes inside of [ 48.075887] 4096-byte region [ffff88006b86a900, ffff88006b86b900) [ 48.077119] The buggy address belongs to the page: [ 48.077660] page:ffffea0001ae1a80 count:1 mapcount:0 mapping:ffff88006b86a900 index:0x0 compound_mapcount: 0 [ 48.078682] flags: 0x500000000008100(slab|head) [ 48.079166] raw: 0500000000008100 ffff88006b86a900 0000000000000000 0000000100000001 [ 48.079969] raw: ffffea0001ae1a20 ffff88006d800a50 ffff88003e800dc0 0000000000000000 [ 48.080745] page dumped because: kasan: bad access detected [ 48.081302] [ 48.081484] Memory state around the buggy address: [ 48.081950] ffff88006b86b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.082654] ffff88006b86b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.083378] >ffff88006b86b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.084129] ^ [ 48.084610] ffff88006b86b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.085574] ffff88006b86b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.086333] ================================================================== [ 48.087091] Disabling lock debugging due to kernel taint [ 48.087737] Kernel panic - not syncing: panic_on_warn set ... [ 48.087737] [ 48.088434] CPU: 2 PID: 2986 Comm: syz-executor0 Tainted: G B 4.13.0-next-20170907+ #17 [ 48.089296] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 48.090060] Call Trace: [ 48.090305] dump_stack+0x194/0x257 [ 48.090644] ? arch_local_irq_restore+0x53/0x53 [ 48.091091] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.091621] ? __dev_remove_pack+0x2f0/0x3b0 [ 48.092155] panic+0x1e4/0x417 [ 48.092585] ? __warn+0x1d9/0x1d9 [ 48.093041] ? __dev_remove_pack+0x305/0x3b0 [ 48.093574] kasan_end_report+0x50/0x50 [ 48.094104] kasan_report+0x137/0x340 [ 48.094642] __asan_report_load8_noabort+0x14/0x20 [ 48.095290] __dev_remove_pack+0x305/0x3b0 [ 48.095880] ? dev_get_by_name_rcu+0x270/0x270 [ 48.096505] ? refcount_sub_and_test+0x115/0x1b0 [ 48.097121] __unregister_prot_hook+0x211/0x280 [ 48.097693] packet_release+0x8bb/0xd70 [ 48.098173] ? packet_set_ring+0x1b70/0x1b70 [ 48.098624] ? dentry_free+0xcd/0x130 [ 48.099001] ? rcu_read_lock_sched_held+0x108/0x120 [ 48.099619] ? kmem_cache_free+0x249/0x280 [ 48.100051] ? dentry_free+0xd2/0x130 [ 48.100567] ? locks_remove_file+0x3fa/0x5a0 [ 48.101019] ? fcntl_setlk+0x10d0/0x10d0 [ 48.101440] ? __fsnotify_parent+0xb4/0x3a0 [ 48.101883] ? fsnotify+0x1af0/0x1af0 [ 48.102282] sock_release+0x8d/0x1e0 [ 48.102658] ? sock_release+0x8d/0x1e0 [ 48.103053] ? sock_release+0x1e0/0x1e0 [ 48.103474] sock_close+0x16/0x20 [ 48.103816] __fput+0x333/0x7f0 [ 48.104467] ? fput+0x140/0x140 [ 48.104802] ? check_same_owner+0x320/0x320 [ 48.105236] ? _raw_spin_unlock_irq+0x27/0x70 [ 48.105689] ____fput+0x15/0x20 [ 48.106008] task_work_run+0x199/0x270 [ 48.106822] ? task_work_cancel+0x210/0x210 [ 48.107290] ? _raw_spin_unlock+0x22/0x30 [ 48.107684] ? switch_task_namespaces+0x87/0xc0 [ 48.108075] do_exit+0xa52/0x1b40 [ 48.108367] ? plist_check_list+0xa0/0xa0 [ 48.108727] ? plist_del+0x47b/0x990 [ 48.109019] ? mm_update_next_owner+0x930/0x930 [ 48.109392] ? plist_add+0x760/0x760 [ 48.109697] ? check_same_owner+0x320/0x320 [ 48.110045] ? find_held_lock+0x39/0x1d0 [ 48.110388] ? check_noncircular+0x20/0x20 [ 48.110744] ? lock_downgrade+0x990/0x990 [ 48.111086] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 48.111534] ? find_held_lock+0x39/0x1d0 [ 48.111891] ? lock_downgrade+0x990/0x990 [ 48.112226] ? recalc_sigpending_tsk+0x117/0x150 [ 48.112629] ? recalc_sigpending+0x103/0x160 [ 48.112988] ? recalc_sigpending_tsk+0x150/0x150 [ 48.113348] ? get_signal+0x397/0x17e0 [ 48.113699] do_group_exit+0x149/0x400 [ 48.113988] ? __lock_is_held+0xbc/0x140 [ 48.114287] ? SyS_exit+0x30/0x30 [ 48.114538] ? _raw_spin_unlock_irq+0x27/0x70 [ 48.114975] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 48.115476] get_signal+0x7e8/0x17e0 [ 48.115786] ? ptrace_notify+0x130/0x130 [ 48.116104] ? __fget+0xbb/0x580 [ 48.116367] ? lock_release+0xd70/0xd70 [ 48.116669] ? exit_robust_list+0x240/0x240 [ 48.117011] do_signal+0x94/0x1ee0 [ 48.117278] ? iterate_fd+0x3f0/0x3f0 [ 48.117548] ? up_read+0x1a/0x40 [ 48.117832] ? setup_sigcontext+0x7d0/0x7d0 [ 48.118206] ? __do_page_fault+0xb60/0xb60 [ 48.118581] ? __fget_light+0x29d/0x390 [ 48.118965] ? selinux_tun_dev_create+0xc0/0xc0 [ 48.119395] ? selinux_netlbl_socket_setsockopt+0x10c/0x460 [ 48.119951] ? selinux_netlbl_sock_rcv_skb+0x730/0x730 [ 48.120348] ? exit_to_usermode_loop+0x98/0x300 [ 48.120713] exit_to_usermode_loop+0x224/0x300 [ 48.121044] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 48.121460] syscall_return_slowpath+0x42f/0x500 [ 48.121819] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 48.122192] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 48.122541] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 48.122902] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.123242] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 48.123740] RIP: 0033:0x447299 [ 48.124064] RSP: 002b:00007f4e74eedcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 48.124852] RAX: fffffffffffffe00 RBX: 0000000000708028 RCX: 0000000000447299 [ 48.125587] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708028 [ 48.126313] RBP: 0000000000708000 R08: 0000000000000000 R09: 0000000000000000 [ 48.127045] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 48.128532] R13: 0000000000000000 R14: 00007f4e74eee9c0 R15: 00007f4e74eee700 [ 48.129290] Dumping ftrace buffer: [ 48.129663] (ftrace buffer empty) [ 48.130044] Kernel Offset: disabled [ 48.130417] Rebooting in 86400 seconds..