[....] Starting enhanced syslogd: rsyslogd[ 13.105708] audit: type=1400 audit(1516984451.667:5): avc: denied { syslog } for pid=3495 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 18.092983] audit: type=1400 audit(1516984456.654:6): avc: denied { map } for pid=3635 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 '10.128.15.219' (ECDSA) to the list of known hosts. executing program [ 24.294848] audit: type=1400 audit(1516984462.856:7): avc: denied { map } for pid=3649 comm="syzkaller348593" path="/root/syzkaller348593806" 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 [ 24.301733] ================================================================== [ 24.301747] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 24.301753] Read of size 8 at addr ffff8801bc4ed0f0 by task syzkaller348593/3649 [ 24.301754] [ 24.301761] CPU: 0 PID: 3649 Comm: syzkaller348593 Not tainted 4.15.0-rc9+ #191 [ 24.301765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.301767] Call Trace: [ 24.301777] dump_stack+0x194/0x257 [ 24.301785] ? arch_local_irq_restore+0x53/0x53 [ 24.301793] ? show_regs_print_info+0x18/0x18 [ 24.301799] ? print_irqtrace_events+0x270/0x270 [ 24.301806] ? __lock_acquire+0x664/0x3e00 [ 24.301813] ? __lock_acquire+0x3d4d/0x3e00 [ 24.301822] print_address_description+0x73/0x250 [ 24.301828] ? __lock_acquire+0x3d4d/0x3e00 [ 24.301835] kasan_report+0x25b/0x340 [ 24.301843] __asan_report_load8_noabort+0x14/0x20 [ 24.301849] __lock_acquire+0x3d4d/0x3e00 [ 24.301855] ? __lock_acquire+0x664/0x3e00 [ 24.301861] ? lock_downgrade+0x980/0x980 [ 24.301867] ? lock_downgrade+0x980/0x980 [ 24.301874] ? print_irqtrace_events+0x270/0x270 [ 24.301880] ? remove_wait_queue+0x81/0x350 [ 24.301890] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.301897] ? __lock_acquire+0x664/0x3e00 [ 24.301903] ? check_noncircular+0x20/0x20 [ 24.301915] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.301922] ? lock_acquire+0x1d5/0x580 [ 24.301928] ? lock_acquire+0x1d5/0x580 [ 24.301937] ? ep_free+0xf4/0x320 [ 24.301945] ? lock_release+0xa40/0xa40 [ 24.301952] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.301958] ? print_irqtrace_events+0x270/0x270 [ 24.301964] ? print_irqtrace_events+0x270/0x270 [ 24.301971] ? rcu_note_context_switch+0x710/0x710 [ 24.301979] ? __might_sleep+0x95/0x190 [ 24.301985] ? ep_free+0xf4/0x320 [ 24.301991] ? __mutex_lock+0x16f/0x1a80 [ 24.301997] ? ep_free+0xf4/0x320 [ 24.302008] ? print_irqtrace_events+0x270/0x270 [ 24.302014] ? ep_free+0xf4/0x320 [ 24.302022] lock_acquire+0x1d5/0x580 [ 24.302028] ? lock_acquire+0x1d5/0x580 [ 24.302034] ? remove_wait_queue+0x81/0x350 [ 24.302042] ? lock_release+0xa40/0xa40 [ 24.302051] ? lock_acquire+0x1d5/0x580 [ 24.302058] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.302063] ? lock_acquire+0x1d5/0x580 [ 24.302069] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 24.302082] _raw_spin_lock_irqsave+0x96/0xc0 [ 24.302087] ? remove_wait_queue+0x81/0x350 [ 24.302094] remove_wait_queue+0x81/0x350 [ 24.302103] ? depot_save_stack+0x3b5/0x490 [ 24.302110] ? add_wait_queue+0x290/0x290 [ 24.302116] ? rcutorture_record_progress+0x10/0x10 [ 24.302122] ? lock_release+0xa40/0xa40 [ 24.302131] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 24.302139] ? __kernel_text_address+0xd/0x40 [ 24.302148] ? clear_tfile_check_list+0x370/0x370 [ 24.302156] ? check_noncircular+0x20/0x20 [ 24.302166] ? locks_remove_file+0x3fa/0x5a0 [ 24.302176] ep_free+0x13f/0x320 [ 24.302182] ? ep_remove+0x800/0x800 [ 24.302188] ? fsnotify_first_mark+0x2b0/0x2b0 [ 24.302196] ? ep_free+0x320/0x320 [ 24.302202] ep_eventpoll_release+0x44/0x60 [ 24.302210] __fput+0x327/0x7e0 [ 24.302218] ? fput+0x140/0x140 [ 24.302226] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.302235] ____fput+0x15/0x20 [ 24.302241] task_work_run+0x199/0x270 [ 24.302249] ? task_work_cancel+0x210/0x210 [ 24.302256] ? _raw_spin_unlock+0x22/0x30 [ 24.302263] ? switch_task_namespaces+0x87/0xc0 [ 24.302271] do_exit+0x9bb/0x1ad0 [ 24.302279] ? __handle_mm_fault+0x2330/0x3ce0 [ 24.302287] ? mm_update_next_owner+0x930/0x930 [ 24.302297] ? do_raw_spin_trylock+0x190/0x190 [ 24.302304] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.302310] ? check_noncircular+0x20/0x20 [ 24.302318] ? _raw_spin_unlock+0x22/0x30 [ 24.302324] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.302332] ? check_noncircular+0x20/0x20 [ 24.302337] ? __pmd_alloc+0x4e0/0x4e0 [ 24.302343] ? lock_downgrade+0x980/0x980 [ 24.302351] ? find_held_lock+0x35/0x1d0 [ 24.302360] ? handle_mm_fault+0x248/0x8d0 [ 24.302368] ? find_held_lock+0x35/0x1d0 [ 24.302378] ? __do_page_fault+0x5f7/0xc90 [ 24.302384] ? lock_downgrade+0x980/0x980 [ 24.302393] ? handle_mm_fault+0x410/0x8d0 [ 24.302398] ? down_read_trylock+0xdb/0x170 [ 24.302404] ? __do_page_fault+0x32d/0xc90 [ 24.302411] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 24.302417] ? vmacache_find+0x5f/0x280 [ 24.302426] do_group_exit+0x149/0x400 [ 24.302433] ? __do_page_fault+0x3d6/0xc90 [ 24.302439] ? SyS_exit+0x30/0x30 [ 24.302447] ? do_fast_syscall_32+0x156/0xf9d [ 24.302453] ? do_group_exit+0x400/0x400 [ 24.302460] SyS_exit_group+0x1d/0x20 [ 24.302466] do_fast_syscall_32+0x3ee/0xf9d [ 24.302475] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.302481] ? kasan_check_read+0x11/0x20 [ 24.302488] ? syscall_return_slowpath+0x550/0x550 [ 24.302496] ? SyS_rt_sigaction+0x94/0x1b0 [ 24.302503] ? SyS_sigprocmask+0x4b0/0x4b0 [ 24.302508] ? SyS_read+0x184/0x220 [ 24.302514] ? retint_user+0x18/0x18 [ 24.302522] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.302531] entry_SYSENTER_compat+0x54/0x63 [ 24.302536] RIP: 0023:0xf7fd4c79 [ 24.302539] RSP: 002b:00000000ffde626c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 24.302546] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 24.302550] RDX: 0000000000000000 RSI: 00000000080d9ab8 RDI: 00000000080f02a0 [ 24.302553] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 24.302556] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.302560] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.302567] [ 24.302570] Allocated by task 3649: [ 24.302576] save_stack+0x43/0xd0 [ 24.302581] kasan_kmalloc+0xad/0xe0 [ 24.302585] kmem_cache_alloc_trace+0x136/0x750 [ 24.302593] binder_get_thread+0x1cf/0x870 [ 24.302598] binder_poll+0x8c/0x390 [ 24.302604] ep_item_poll.isra.10+0xec/0x320 [ 24.302609] ep_insert+0x6a3/0x1b10 [ 24.302614] SyS_epoll_ctl+0x12e4/0x1ab0 [ 24.302619] do_fast_syscall_32+0x3ee/0xf9d [ 24.302624] entry_SYSENTER_compat+0x54/0x63 [ 24.302625] [ 24.302627] Freed by task 3649: [ 24.302632] save_stack+0x43/0xd0 [ 24.302637] kasan_slab_free+0x71/0xc0 [ 24.302641] kfree+0xd6/0x260 [ 24.302647] binder_thread_dec_tmpref+0x27f/0x310 [ 24.302653] binder_thread_release+0x27d/0x540 [ 24.302657] binder_ioctl+0xc02/0x1417 [ 24.302662] compat_SyS_ioctl+0x151/0x2a30 [ 24.302667] do_fast_syscall_32+0x3ee/0xf9d [ 24.302672] entry_SYSENTER_compat+0x54/0x63 [ 24.302674] [ 24.302677] The buggy address belongs to the object at ffff8801bc4ed040 [ 24.302677] which belongs to the cache kmalloc-512 of size 512 [ 24.302682] The buggy address is located 176 bytes inside of [ 24.302682] 512-byte region [ffff8801bc4ed040, ffff8801bc4ed240) [ 24.302684] The buggy address belongs to the page: [ 24.302689] page:ffffea0006f13b40 count:1 mapcount:0 mapping:ffff8801bc4ed040 index:0x0 [ 24.302695] flags: 0x2fffc0000000100(slab) [ 24.302703] raw: 02fffc0000000100 ffff8801bc4ed040 0000000000000000 0000000100000006 [ 24.302710] raw: ffffea0006f083e0 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 24.302713] page dumped because: kasan: bad access detected [ 24.302714] [ 24.302715] Memory state around the buggy address: [ 24.302720] ffff8801bc4ecf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 24.302725] ffff8801bc4ed000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 24.302729] >ffff8801bc4ed080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.302731] ^ [ 24.302736] ffff8801bc4ed100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.302740] ffff8801bc4ed180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.302742] ================================================================== [ 24.302743] Disabling lock debugging due to kernel taint [ 24.302747] Kernel panic - not syncing: panic_on_warn set ... [ 24.302747] [ 24.302753] CPU: 0 PID: 3649 Comm: syzkaller348593 Tainted: G B 4.15.0-rc9+ #191 [ 24.302756] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.302758] Call Trace: [ 24.302764] dump_stack+0x194/0x257 [ 24.302772] ? arch_local_irq_restore+0x53/0x53 [ 24.302778] ? kasan_end_report+0x32/0x50 [ 24.302784] ? lock_downgrade+0x980/0x980 [ 24.302791] ? vsnprintf+0x1ed/0x1900 [ 24.302797] ? __lock_acquire+0x3ca0/0x3e00 [ 24.302803] panic+0x1e4/0x41c [ 24.302809] ? refcount_error_report+0x214/0x214 [ 24.302816] ? add_taint+0x40/0x50 [ 24.302821] ? add_taint+0x1c/0x50 [ 24.302828] ? __lock_acquire+0x3d4d/0x3e00 [ 24.302834] kasan_end_report+0x50/0x50 [ 24.302840] kasan_report+0x144/0x340 [ 24.302848] __asan_report_load8_noabort+0x14/0x20 [ 24.302854] __lock_acquire+0x3d4d/0x3e00 [ 24.302860] ? __lock_acquire+0x664/0x3e00 [ 24.302866] ? lock_downgrade+0x980/0x980 [ 24.302871] ? lock_downgrade+0x980/0x980 [ 24.302878] ? print_irqtrace_events+0x270/0x270 [ 24.302884] ? remove_wait_queue+0x81/0x350 [ 24.302893] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.302899] ? __lock_acquire+0x664/0x3e00 [ 24.302905] ? check_noncircular+0x20/0x20 [ 24.302917] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.302924] ? lock_acquire+0x1d5/0x580 [ 24.302930] ? lock_acquire+0x1d5/0x580 [ 24.302935] ? ep_free+0xf4/0x320 [ 24.302943] ? lock_release+0xa40/0xa40 [ 24.302949] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.302955] ? print_irqtrace_events+0x270/0x270 [ 24.302961] ? print_irqtrace_events+0x270/0x270 [ 24.302967] ? rcu_note_context_switch+0x710/0x710 [ 24.302974] ? __might_sleep+0x95/0x190 [ 24.302980] ? ep_free+0xf4/0x320 [ 24.302986] ? __mutex_lock+0x16f/0x1a80 [ 24.302991] ? ep_free+0xf4/0x320 [ 24.302999] ? print_irqtrace_events+0x270/0x270 [ 24.303004] ? ep_free+0xf4/0x320 [ 24.303012] lock_acquire+0x1d5/0x580 [ 24.303018] ? lock_acquire+0x1d5/0x580 [ 24.303024] ? remove_wait_queue+0x81/0x350 [ 24.303032] ? lock_release+0xa40/0xa40 [ 24.303041] ? lock_acquire+0x1d5/0x580 [ 24.303046] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.303052] ? lock_acquire+0x1d5/0x580 [ 24.303058] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 24.303065] _raw_spin_lock_irqsave+0x96/0xc0 [ 24.303074] ? remove_wait_queue+0x81/0x350 [ 24.303081] remove_wait_queue+0x81/0x350 [ 24.303087] ? depot_save_stack+0x3b5/0x490 [ 24.303094] ? add_wait_queue+0x290/0x290 [ 24.303100] ? rcutorture_record_progress+0x10/0x10 [ 24.303106] ? lock_release+0xa40/0xa40 [ 24.303115] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 24.303122] ? __kernel_text_address+0xd/0x40 [ 24.303130] ? clear_tfile_check_list+0x370/0x370 [ 24.303137] ? check_noncircular+0x20/0x20 [ 24.303145] ? locks_remove_file+0x3fa/0x5a0 [ 24.303154] ep_free+0x13f/0x320 [ 24.303160] ? ep_remove+0x800/0x800 [ 24.303166] ? fsnotify_first_mark+0x2b0/0x2b0 [ 24.303174] ? ep_free+0x320/0x320 [ 24.303180] ep_eventpoll_release+0x44/0x60 [ 24.303186] __fput+0x327/0x7e0 [ 24.303195] ? fput+0x140/0x140 [ 24.303202] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.303210] ____fput+0x15/0x20 [ 24.303217] task_work_run+0x199/0x270 [ 24.303225] ? task_work_cancel+0x210/0x210 [ 24.303231] ? _raw_spin_unlock+0x22/0x30 [ 24.303237] ? switch_task_namespaces+0x87/0xc0 [ 24.303245] do_exit+0x9bb/0x1ad0 [ 24.303251] ? __handle_mm_fault+0x2330/0x3ce0 [ 24.303259] ? mm_update_next_owner+0x930/0x930 [ 24.303268] ? do_raw_spin_trylock+0x190/0x190 [ 24.303275] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.303281] ? check_noncircular+0x20/0x20 [ 24.303289] ? _raw_spin_unlock+0x22/0x30 [ 24.303295] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.303303] ? check_noncircular+0x20/0x20 [ 24.303308] ? __pmd_alloc+0x4e0/0x4e0 [ 24.303313] ? lock_downgrade+0x980/0x980 [ 24.303321] ? find_held_lock+0x35/0x1d0 [ 24.303330] ? handle_mm_fault+0x248/0x8d0 [ 24.303336] ? find_held_lock+0x35/0x1d0 [ 24.303345] ? __do_page_fault+0x5f7/0xc90 [ 24.303352] ? lock_downgrade+0x980/0x980 [ 24.303361] ? handle_mm_fault+0x410/0x8d0 [ 24.303366] ? down_read_trylock+0xdb/0x170 [ 24.303372] ? __do_page_fault+0x32d/0xc90 [ 24.303378] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 24.303384] ? vmacache_find+0x5f/0x280 [ 24.303392] do_group_exit+0x149/0x400 [ 24.303398] ? __do_page_fault+0x3d6/0xc90 [ 24.303404] ? SyS_exit+0x30/0x30 [ 24.303412] ? do_fast_syscall_32+0x156/0xf9d [ 24.303418] ? do_group_exit+0x400/0x400 [ 24.303425] SyS_exit_group+0x1d/0x20 [ 24.303431] do_fast_syscall_32+0x3ee/0xf9d [ 24.303439] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.303445] ? kasan_check_read+0x11/0x20 [ 24.303452] ? syscall_return_slowpath+0x550/0x550 [ 24.303459] ? SyS_rt_sigaction+0x94/0x1b0 [ 24.303466] ? SyS_sigprocmask+0x4b0/0x4b0 [ 24.303471] ? SyS_read+0x184/0x220 [ 24.303476] ? retint_user+0x18/0x18 [ 24.303484] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.303493] entry_SYSENTER_compat+0x54/0x63 [ 24.303496] RIP: 0023:0xf7fd4c79 [ 24.303499] RSP: 002b:00000000ffde626c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 24.303505] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 24.303509] RDX: 0000000000000000 RSI: 00000000080d9ab8 RDI: 00000000080f02a0 [ 24.303512] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 24.303515] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.303518] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.321138] Dumping ftrace buffer: [ 24.321142] (ftrace buffer empty) [ 24.321144] Kernel Offset: disabled [ 25.605694] Rebooting in 86400 seconds..