[....] Starting enhanced syslogd: rsyslogd[ 13.475952] audit: type=1400 audit(1516667997.786:5): avc: denied { syslog } for pid=3504 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 18.853773] audit: type=1400 audit(1516668003.164:6): avc: denied { map } for pid=3644 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 '10.128.15.211' (ECDSA) to the list of known hosts. executing program [ 25.100333] audit: type=1400 audit(1516668009.411:7): avc: denied { map } for pid=3658 comm="syzkaller125252" path="/root/syzkaller125252102" 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 [ 25.105083] ================================================================== [ 25.105097] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 25.105103] Read of size 8 at addr ffff8801bb6e2af0 by task syzkaller125252/3658 [ 25.105105] [ 25.105112] CPU: 1 PID: 3658 Comm: syzkaller125252 Not tainted 4.15.0-rc9+ #184 [ 25.105115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.105117] Call Trace: [ 25.105127] dump_stack+0x194/0x257 [ 25.105135] ? arch_local_irq_restore+0x53/0x53 [ 25.105144] ? show_regs_print_info+0x18/0x18 [ 25.105150] ? print_irqtrace_events+0x270/0x270 [ 25.105156] ? __lock_acquire+0x664/0x3e00 [ 25.105163] ? __lock_acquire+0x3d4d/0x3e00 [ 25.105172] print_address_description+0x73/0x250 [ 25.105179] ? __lock_acquire+0x3d4d/0x3e00 [ 25.105185] kasan_report+0x25b/0x340 [ 25.105193] __asan_report_load8_noabort+0x14/0x20 [ 25.105199] __lock_acquire+0x3d4d/0x3e00 [ 25.105205] ? __lock_acquire+0x664/0x3e00 [ 25.105211] ? lock_downgrade+0x980/0x980 [ 25.105216] ? lock_downgrade+0x980/0x980 [ 25.105223] ? print_irqtrace_events+0x270/0x270 [ 25.105230] ? remove_wait_queue+0x81/0x350 [ 25.105239] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.105245] ? __lock_acquire+0x664/0x3e00 [ 25.105251] ? check_noncircular+0x20/0x20 [ 25.105263] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.105270] ? lock_acquire+0x1d5/0x580 [ 25.105276] ? lock_acquire+0x1d5/0x580 [ 25.105283] ? ep_free+0xf4/0x320 [ 25.105292] ? lock_release+0xa40/0xa40 [ 25.105299] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.105304] ? print_irqtrace_events+0x270/0x270 [ 25.105310] ? print_irqtrace_events+0x270/0x270 [ 25.105317] ? rcu_note_context_switch+0x710/0x710 [ 25.105325] ? __might_sleep+0x95/0x190 [ 25.105331] ? ep_free+0xf4/0x320 [ 25.105338] ? __mutex_lock+0x16f/0x1a80 [ 25.105343] ? ep_free+0xf4/0x320 [ 25.105350] ? print_irqtrace_events+0x270/0x270 [ 25.105355] ? ep_free+0xf4/0x320 [ 25.105363] lock_acquire+0x1d5/0x580 [ 25.105369] ? lock_acquire+0x1d5/0x580 [ 25.105375] ? remove_wait_queue+0x81/0x350 [ 25.105384] ? lock_release+0xa40/0xa40 [ 25.105393] ? lock_acquire+0x1d5/0x580 [ 25.105399] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.105404] ? lock_acquire+0x1d5/0x580 [ 25.105410] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.105418] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.105424] ? remove_wait_queue+0x81/0x350 [ 25.105431] remove_wait_queue+0x81/0x350 [ 25.105438] ? depot_save_stack+0x3b5/0x490 [ 25.105445] ? add_wait_queue+0x290/0x290 [ 25.105451] ? rcutorture_record_progress+0x10/0x10 [ 25.105457] ? lock_release+0xa40/0xa40 [ 25.105466] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.105474] ? __kernel_text_address+0xd/0x40 [ 25.105482] ? clear_tfile_check_list+0x370/0x370 [ 25.105489] ? check_noncircular+0x20/0x20 [ 25.105498] ? locks_remove_file+0x3fa/0x5a0 [ 25.105508] ep_free+0x13f/0x320 [ 25.105514] ? ep_remove+0x800/0x800 [ 25.105520] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.105528] ? ep_free+0x320/0x320 [ 25.105534] ep_eventpoll_release+0x44/0x60 [ 25.105541] __fput+0x327/0x7e0 [ 25.105549] ? fput+0x140/0x140 [ 25.105557] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.105565] ____fput+0x15/0x20 [ 25.105572] task_work_run+0x199/0x270 [ 25.105580] ? task_work_cancel+0x210/0x210 [ 25.105586] ? _raw_spin_unlock+0x22/0x30 [ 25.105592] ? switch_task_namespaces+0x87/0xc0 [ 25.105601] do_exit+0x9bb/0x1ad0 [ 25.105608] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.105616] ? mm_update_next_owner+0x930/0x930 [ 25.105625] ? do_raw_spin_trylock+0x190/0x190 [ 25.105633] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.105639] ? check_noncircular+0x20/0x20 [ 25.105646] ? _raw_spin_unlock+0x22/0x30 [ 25.105652] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.105660] ? check_noncircular+0x20/0x20 [ 25.105665] ? __pmd_alloc+0x4e0/0x4e0 [ 25.105671] ? lock_downgrade+0x980/0x980 [ 25.105679] ? find_held_lock+0x35/0x1d0 [ 25.105688] ? handle_mm_fault+0x248/0x8d0 [ 25.105695] ? find_held_lock+0x35/0x1d0 [ 25.105705] ? __do_page_fault+0x5f7/0xc90 [ 25.105711] ? lock_downgrade+0x980/0x980 [ 25.105720] ? handle_mm_fault+0x410/0x8d0 [ 25.105725] ? down_read_trylock+0xdb/0x170 [ 25.105736] ? __do_page_fault+0x32d/0xc90 [ 25.105742] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.105748] ? vmacache_find+0x5f/0x280 [ 25.105757] do_group_exit+0x149/0x400 [ 25.105764] ? __do_page_fault+0x3d6/0xc90 [ 25.105770] ? SyS_exit+0x30/0x30 [ 25.105779] ? do_fast_syscall_32+0x156/0xf9d [ 25.105785] ? do_group_exit+0x400/0x400 [ 25.105791] SyS_exit_group+0x1d/0x20 [ 25.105797] do_fast_syscall_32+0x3ee/0xf9d [ 25.105806] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.105812] ? kasan_check_read+0x11/0x20 [ 25.105819] ? syscall_return_slowpath+0x550/0x550 [ 25.105826] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.105833] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.105838] ? SyS_read+0x184/0x220 [ 25.105844] ? retint_user+0x18/0x18 [ 25.105852] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.105861] entry_SYSENTER_compat+0x54/0x63 [ 25.105865] RIP: 0023:0xf7f01c79 [ 25.105868] RSP: 002b:00000000ff9c7adc EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 25.105875] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.105879] RDX: 0000000000000000 RSI: 00000000080d9ab8 RDI: 00000000080f02a0 [ 25.105882] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.105885] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.105888] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.105896] [ 25.105899] Allocated by task 3658: [ 25.105905] save_stack+0x43/0xd0 [ 25.105910] kasan_kmalloc+0xad/0xe0 [ 25.105915] kmem_cache_alloc_trace+0x136/0x750 [ 25.105923] binder_get_thread+0x1cf/0x870 [ 25.105928] binder_poll+0x8c/0x390 [ 25.105933] ep_item_poll.isra.10+0xec/0x320 [ 25.105938] ep_insert+0x6a3/0x1b10 [ 25.105943] SyS_epoll_ctl+0x12e4/0x1ab0 [ 25.105948] do_fast_syscall_32+0x3ee/0xf9d [ 25.105953] entry_SYSENTER_compat+0x54/0x63 [ 25.105954] [ 25.105957] Freed by task 3658: [ 25.105961] save_stack+0x43/0xd0 [ 25.105966] kasan_slab_free+0x71/0xc0 [ 25.105970] kfree+0xd6/0x260 [ 25.105976] binder_thread_dec_tmpref+0x27f/0x310 [ 25.105982] binder_thread_release+0x27d/0x540 [ 25.105986] binder_ioctl+0xc02/0x1417 [ 25.105991] compat_SyS_ioctl+0x151/0x2a30 [ 25.105996] do_fast_syscall_32+0x3ee/0xf9d [ 25.106005] entry_SYSENTER_compat+0x54/0x63 [ 25.106006] [ 25.106010] The buggy address belongs to the object at ffff8801bb6e2a40 [ 25.106010] which belongs to the cache kmalloc-512 of size 512 [ 25.106015] The buggy address is located 176 bytes inside of [ 25.106015] 512-byte region [ffff8801bb6e2a40, ffff8801bb6e2c40) [ 25.106017] The buggy address belongs to the page: [ 25.106022] page:ffffea0006edb880 count:1 mapcount:0 mapping:ffff8801bb6e2040 index:0x0 [ 25.106027] flags: 0x2fffc0000000100(slab) [ 25.106036] raw: 02fffc0000000100 ffff8801bb6e2040 0000000000000000 0000000100000006 [ 25.106043] raw: ffffea0006edbd20 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 25.106045] page dumped because: kasan: bad access detected [ 25.106046] [ 25.106048] Memory state around the buggy address: [ 25.106052] ffff8801bb6e2980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.106057] ffff8801bb6e2a00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 25.106061] >ffff8801bb6e2a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.106064] ^ [ 25.106068] ffff8801bb6e2b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.106073] ffff8801bb6e2b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.106074] ================================================================== [ 25.106076] Disabling lock debugging due to kernel taint [ 25.106079] Kernel panic - not syncing: panic_on_warn set ... [ 25.106079] [ 25.106086] CPU: 1 PID: 3658 Comm: syzkaller125252 Tainted: G B 4.15.0-rc9+ #184 [ 25.106089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.106090] Call Trace: [ 25.106097] dump_stack+0x194/0x257 [ 25.106105] ? arch_local_irq_restore+0x53/0x53 [ 25.106110] ? kasan_end_report+0x32/0x50 [ 25.106117] ? lock_downgrade+0x980/0x980 [ 25.106124] ? vsnprintf+0x1ed/0x1900 [ 25.106130] ? __lock_acquire+0x3ca0/0x3e00 [ 25.106136] panic+0x1e4/0x41c [ 25.106141] ? refcount_error_report+0x214/0x214 [ 25.106149] ? add_taint+0x40/0x50 [ 25.106154] ? add_taint+0x1c/0x50 [ 25.106161] ? __lock_acquire+0x3d4d/0x3e00 [ 25.106167] kasan_end_report+0x50/0x50 [ 25.106173] kasan_report+0x144/0x340 [ 25.106181] __asan_report_load8_noabort+0x14/0x20 [ 25.106187] __lock_acquire+0x3d4d/0x3e00 [ 25.106192] ? __lock_acquire+0x664/0x3e00 [ 25.106198] ? lock_downgrade+0x980/0x980 [ 25.106204] ? lock_downgrade+0x980/0x980 [ 25.106210] ? print_irqtrace_events+0x270/0x270 [ 25.106217] ? remove_wait_queue+0x81/0x350 [ 25.106225] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.106232] ? __lock_acquire+0x664/0x3e00 [ 25.106237] ? check_noncircular+0x20/0x20 [ 25.106249] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.106256] ? lock_acquire+0x1d5/0x580 [ 25.106262] ? lock_acquire+0x1d5/0x580 [ 25.106267] ? ep_free+0xf4/0x320 [ 25.106275] ? lock_release+0xa40/0xa40 [ 25.106281] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.106287] ? print_irqtrace_events+0x270/0x270 [ 25.106293] ? print_irqtrace_events+0x270/0x270 [ 25.106299] ? rcu_note_context_switch+0x710/0x710 [ 25.106306] ? __might_sleep+0x95/0x190 [ 25.106312] ? ep_free+0xf4/0x320 [ 25.106318] ? __mutex_lock+0x16f/0x1a80 [ 25.106323] ? ep_free+0xf4/0x320 [ 25.106331] ? print_irqtrace_events+0x270/0x270 [ 25.106336] ? ep_free+0xf4/0x320 [ 25.106344] lock_acquire+0x1d5/0x580 [ 25.106349] ? lock_acquire+0x1d5/0x580 [ 25.106355] ? remove_wait_queue+0x81/0x350 [ 25.106364] ? lock_release+0xa40/0xa40 [ 25.106372] ? lock_acquire+0x1d5/0x580 [ 25.106378] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.106384] ? lock_acquire+0x1d5/0x580 [ 25.106390] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.106398] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.106404] ? remove_wait_queue+0x81/0x350 [ 25.106410] remove_wait_queue+0x81/0x350 [ 25.106416] ? depot_save_stack+0x3b5/0x490 [ 25.106423] ? add_wait_queue+0x290/0x290 [ 25.106429] ? rcutorture_record_progress+0x10/0x10 [ 25.106435] ? lock_release+0xa40/0xa40 [ 25.106444] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.106450] ? __kernel_text_address+0xd/0x40 [ 25.106458] ? clear_tfile_check_list+0x370/0x370 [ 25.106466] ? check_noncircular+0x20/0x20 [ 25.106474] ? locks_remove_file+0x3fa/0x5a0 [ 25.106483] ep_free+0x13f/0x320 [ 25.106489] ? ep_remove+0x800/0x800 [ 25.106495] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.106503] ? ep_free+0x320/0x320 [ 25.106509] ep_eventpoll_release+0x44/0x60 [ 25.106515] __fput+0x327/0x7e0 [ 25.106523] ? fput+0x140/0x140 [ 25.106530] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.106538] ____fput+0x15/0x20 [ 25.106545] task_work_run+0x199/0x270 [ 25.106553] ? task_work_cancel+0x210/0x210 [ 25.106559] ? _raw_spin_unlock+0x22/0x30 [ 25.106566] ? switch_task_namespaces+0x87/0xc0 [ 25.106573] do_exit+0x9bb/0x1ad0 [ 25.106579] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.106587] ? mm_update_next_owner+0x930/0x930 [ 25.106597] ? do_raw_spin_trylock+0x190/0x190 [ 25.106604] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.106610] ? check_noncircular+0x20/0x20 [ 25.106617] ? _raw_spin_unlock+0x22/0x30 [ 25.106623] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.106631] ? check_noncircular+0x20/0x20 [ 25.106636] ? __pmd_alloc+0x4e0/0x4e0 [ 25.106641] ? lock_downgrade+0x980/0x980 [ 25.106650] ? find_held_lock+0x35/0x1d0 [ 25.106658] ? handle_mm_fault+0x248/0x8d0 [ 25.106665] ? find_held_lock+0x35/0x1d0 [ 25.106674] ? __do_page_fault+0x5f7/0xc90 [ 25.106680] ? lock_downgrade+0x980/0x980 [ 25.106689] ? handle_mm_fault+0x410/0x8d0 [ 25.106694] ? down_read_trylock+0xdb/0x170 [ 25.106700] ? __do_page_fault+0x32d/0xc90 [ 25.106706] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.106712] ? vmacache_find+0x5f/0x280 [ 25.106721] do_group_exit+0x149/0x400 [ 25.106727] ? __do_page_fault+0x3d6/0xc90 [ 25.106737] ? SyS_exit+0x30/0x30 [ 25.106745] ? do_fast_syscall_32+0x156/0xf9d [ 25.106751] ? do_group_exit+0x400/0x400 [ 25.106757] SyS_exit_group+0x1d/0x20 [ 25.106763] do_fast_syscall_32+0x3ee/0xf9d [ 25.106772] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.106777] ? kasan_check_read+0x11/0x20 [ 25.106784] ? syscall_return_slowpath+0x550/0x550 [ 25.106791] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.106798] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.106803] ? SyS_read+0x184/0x220 [ 25.106808] ? retint_user+0x18/0x18 [ 25.106817] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.106825] entry_SYSENTER_compat+0x54/0x63 [ 25.106828] RIP: 0023:0xf7f01c79 [ 25.106831] RSP: 002b:00000000ff9c7adc EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 25.106837] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.106840] RDX: 0000000000000000 RSI: 00000000080d9ab8 RDI: 00000000080f02a0 [ 25.106844] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.106847] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.106850] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.126689] Dumping ftrace buffer: [ 25.126692] (ftrace buffer empty) [ 25.126695] Kernel Offset: disabled [ 26.410656] Rebooting in 86400 seconds..