[....] Starting enhanced syslogd: rsyslogd[ 13.731617] audit: type=1400 audit(1516149851.002:5): avc: denied { syslog } for pid=3499 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: [ 19.390853] audit: type=1400 audit(1516149856.661:6): avc: denied { map } for pid=3638 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 '10.128.0.63' (ECDSA) to the list of known hosts. executing program [ 25.620799] audit: type=1400 audit(1516149862.891:7): avc: denied { map } for pid=3652 comm="syzkaller557467" path="/root/syzkaller557467377" 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 [ 25.627875] ================================================================== [ 25.627888] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 25.627894] Read of size 8 at addr ffff8801d9b42870 by task syzkaller557467/3652 [ 25.627895] [ 25.627902] CPU: 0 PID: 3652 Comm: syzkaller557467 Not tainted 4.15.0-rc8+ #174 [ 25.627905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.627908] Call Trace: [ 25.627918] dump_stack+0x194/0x257 [ 25.627926] ? arch_local_irq_restore+0x53/0x53 [ 25.627934] ? show_regs_print_info+0x18/0x18 [ 25.627940] ? print_irqtrace_events+0x270/0x270 [ 25.627945] ? __lock_acquire+0x664/0x3e00 [ 25.627951] ? __lock_acquire+0x3d4d/0x3e00 [ 25.627959] print_address_description+0x73/0x250 [ 25.627965] ? __lock_acquire+0x3d4d/0x3e00 [ 25.627972] kasan_report+0x25b/0x340 [ 25.627980] __asan_report_load8_noabort+0x14/0x20 [ 25.627985] __lock_acquire+0x3d4d/0x3e00 [ 25.627991] ? __lock_acquire+0x664/0x3e00 [ 25.627997] ? lock_downgrade+0x980/0x980 [ 25.628007] ? lock_downgrade+0x980/0x980 [ 25.628013] ? print_irqtrace_events+0x270/0x270 [ 25.628020] ? remove_wait_queue+0x81/0x350 [ 25.628029] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.628035] ? __lock_acquire+0x664/0x3e00 [ 25.628041] ? check_noncircular+0x20/0x20 [ 25.628053] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.628060] ? lock_acquire+0x1d5/0x580 [ 25.628065] ? lock_acquire+0x1d5/0x580 [ 25.628072] ? ep_free+0xf4/0x320 [ 25.628080] ? lock_release+0xa40/0xa40 [ 25.628088] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.628094] ? print_irqtrace_events+0x270/0x270 [ 25.628100] ? print_irqtrace_events+0x270/0x270 [ 25.628108] ? rcu_note_context_switch+0x710/0x710 [ 25.628115] ? __might_sleep+0x95/0x190 [ 25.628121] ? ep_free+0xf4/0x320 [ 25.628128] ? __mutex_lock+0x16f/0x1a80 [ 25.628133] ? ep_free+0xf4/0x320 [ 25.628140] ? print_irqtrace_events+0x270/0x270 [ 25.628145] ? ep_free+0xf4/0x320 [ 25.628153] lock_acquire+0x1d5/0x580 [ 25.628159] ? lock_acquire+0x1d5/0x580 [ 25.628165] ? remove_wait_queue+0x81/0x350 [ 25.628173] ? lock_release+0xa40/0xa40 [ 25.628182] ? lock_acquire+0x1d5/0x580 [ 25.628188] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.628193] ? lock_acquire+0x1d5/0x580 [ 25.628199] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.628207] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.628212] ? remove_wait_queue+0x81/0x350 [ 25.628218] remove_wait_queue+0x81/0x350 [ 25.628226] ? depot_save_stack+0x3b5/0x490 [ 25.628233] ? add_wait_queue+0x290/0x290 [ 25.628239] ? rcutorture_record_progress+0x10/0x10 [ 25.628244] ? lock_release+0xa40/0xa40 [ 25.628253] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.628261] ? __kernel_text_address+0xd/0x40 [ 25.628269] ? clear_tfile_check_list+0x370/0x370 [ 25.628276] ? check_noncircular+0x20/0x20 [ 25.628285] ? locks_remove_file+0x3fa/0x5a0 [ 25.628295] ep_free+0x13f/0x320 [ 25.628301] ? ep_remove+0x800/0x800 [ 25.628307] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.628315] ? ep_free+0x320/0x320 [ 25.628321] ep_eventpoll_release+0x44/0x60 [ 25.628327] __fput+0x327/0x7e0 [ 25.628336] ? fput+0x140/0x140 [ 25.628343] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.628352] ____fput+0x15/0x20 [ 25.628358] task_work_run+0x199/0x270 [ 25.628366] ? task_work_cancel+0x210/0x210 [ 25.628373] ? _raw_spin_unlock+0x22/0x30 [ 25.628379] ? switch_task_namespaces+0x87/0xc0 [ 25.628387] do_exit+0x9bb/0x1ad0 [ 25.628395] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.628402] ? mm_update_next_owner+0x930/0x930 [ 25.628412] ? do_raw_spin_trylock+0x190/0x190 [ 25.628419] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.628425] ? check_noncircular+0x20/0x20 [ 25.628433] ? _raw_spin_unlock+0x22/0x30 [ 25.628439] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.628447] ? check_noncircular+0x20/0x20 [ 25.628451] ? __pmd_alloc+0x4e0/0x4e0 [ 25.628457] ? lock_downgrade+0x980/0x980 [ 25.628465] ? find_held_lock+0x35/0x1d0 [ 25.628474] ? handle_mm_fault+0x248/0x8d0 [ 25.628481] ? find_held_lock+0x35/0x1d0 [ 25.628491] ? __do_page_fault+0x5f7/0xc90 [ 25.628497] ? lock_downgrade+0x980/0x980 [ 25.628506] ? handle_mm_fault+0x410/0x8d0 [ 25.628511] ? down_read_trylock+0xdb/0x170 [ 25.628517] ? __do_page_fault+0x32d/0xc90 [ 25.628523] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.628530] ? vmacache_find+0x5f/0x280 [ 25.628538] do_group_exit+0x149/0x400 [ 25.628545] ? __do_page_fault+0x3d6/0xc90 [ 25.628550] ? SyS_exit+0x30/0x30 [ 25.628564] ? do_fast_syscall_32+0x156/0xf9d [ 25.628570] ? do_group_exit+0x400/0x400 [ 25.628576] SyS_exit_group+0x1d/0x20 [ 25.628582] do_fast_syscall_32+0x3ee/0xf9d [ 25.628591] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.628597] ? kasan_check_read+0x11/0x20 [ 25.628604] ? syscall_return_slowpath+0x550/0x550 [ 25.628611] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.628617] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.628623] ? SyS_read+0x184/0x220 [ 25.628628] ? retint_user+0x18/0x18 [ 25.628637] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.628646] entry_SYSENTER_compat+0x54/0x63 [ 25.628651] RIP: 0023:0xf7f30c79 [ 25.628654] RSP: 002b:00000000ff8feaec EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 25.628661] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.628664] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 25.628667] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.628670] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.628673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.628682] [ 25.628685] Allocated by task 3652: [ 25.628691] save_stack+0x43/0xd0 [ 25.628696] kasan_kmalloc+0xad/0xe0 [ 25.628700] kmem_cache_alloc_trace+0x136/0x750 [ 25.628708] binder_get_thread+0x1cf/0x870 [ 25.628713] binder_poll+0x8c/0x390 [ 25.628718] ep_item_poll.isra.10+0xec/0x320 [ 25.628723] ep_insert+0x6a3/0x1b10 [ 25.628728] SyS_epoll_ctl+0x12e4/0x1ab0 [ 25.628733] do_fast_syscall_32+0x3ee/0xf9d [ 25.628738] entry_SYSENTER_compat+0x54/0x63 [ 25.628739] [ 25.628741] Freed by task 3652: [ 25.628746] save_stack+0x43/0xd0 [ 25.628751] kasan_slab_free+0x71/0xc0 [ 25.628755] kfree+0xd6/0x260 [ 25.628760] binder_thread_dec_tmpref+0x27f/0x310 [ 25.628766] binder_thread_release+0x27d/0x540 [ 25.628771] binder_ioctl+0xc02/0x1417 [ 25.628776] compat_SyS_ioctl+0x151/0x2a30 [ 25.628781] do_fast_syscall_32+0x3ee/0xf9d [ 25.628786] entry_SYSENTER_compat+0x54/0x63 [ 25.628787] [ 25.628791] The buggy address belongs to the object at ffff8801d9b427c0 [ 25.628791] which belongs to the cache kmalloc-512 of size 512 [ 25.628796] The buggy address is located 176 bytes inside of [ 25.628796] 512-byte region [ffff8801d9b427c0, ffff8801d9b429c0) [ 25.628797] The buggy address belongs to the page: [ 25.628803] page:ffffea000766d080 count:1 mapcount:0 mapping:ffff8801d9b42040 index:0x0 [ 25.628808] flags: 0x2fffc0000000100(slab) [ 25.628817] raw: 02fffc0000000100 ffff8801d9b42040 0000000000000000 0000000100000006 [ 25.628823] raw: ffffea0006f1fc60 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 25.628826] page dumped because: kasan: bad access detected [ 25.628827] [ 25.628828] Memory state around the buggy address: [ 25.628833] ffff8801d9b42700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.628837] ffff8801d9b42780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 25.628841] >ffff8801d9b42800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.628843] ^ [ 25.628848] ffff8801d9b42880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.628852] ffff8801d9b42900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.628854] ================================================================== [ 25.628855] Disabling lock debugging due to kernel taint [ 25.628859] Kernel panic - not syncing: panic_on_warn set ... [ 25.628859] [ 25.628865] CPU: 0 PID: 3652 Comm: syzkaller557467 Tainted: G B 4.15.0-rc8+ #174 [ 25.628868] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.628870] Call Trace: [ 25.628877] dump_stack+0x194/0x257 [ 25.628884] ? arch_local_irq_restore+0x53/0x53 [ 25.628890] ? kasan_end_report+0x32/0x50 [ 25.628896] ? lock_downgrade+0x980/0x980 [ 25.628903] ? vsnprintf+0x1ed/0x1900 [ 25.628909] ? __lock_acquire+0x3c70/0x3e00 [ 25.628915] panic+0x1e4/0x41c [ 25.628920] ? refcount_error_report+0x214/0x214 [ 25.628927] ? add_taint+0x40/0x50 [ 25.628932] ? add_taint+0x1c/0x50 [ 25.628939] ? __lock_acquire+0x3d4d/0x3e00 [ 25.628945] kasan_end_report+0x50/0x50 [ 25.628951] kasan_report+0x144/0x340 [ 25.628959] __asan_report_load8_noabort+0x14/0x20 [ 25.628964] __lock_acquire+0x3d4d/0x3e00 [ 25.628970] ? __lock_acquire+0x664/0x3e00 [ 25.628976] ? lock_downgrade+0x980/0x980 [ 25.628981] ? lock_downgrade+0x980/0x980 [ 25.628987] ? print_irqtrace_events+0x270/0x270 [ 25.628993] ? remove_wait_queue+0x81/0x350 [ 25.629002] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.629009] ? __lock_acquire+0x664/0x3e00 [ 25.629014] ? check_noncircular+0x20/0x20 [ 25.629026] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.629033] ? lock_acquire+0x1d5/0x580 [ 25.629038] ? lock_acquire+0x1d5/0x580 [ 25.629043] ? ep_free+0xf4/0x320 [ 25.629051] ? lock_release+0xa40/0xa40 [ 25.629057] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.629062] ? print_irqtrace_events+0x270/0x270 [ 25.629068] ? print_irqtrace_events+0x270/0x270 [ 25.629074] ? rcu_note_context_switch+0x710/0x710 [ 25.629081] ? __might_sleep+0x95/0x190 [ 25.629087] ? ep_free+0xf4/0x320 [ 25.629093] ? __mutex_lock+0x16f/0x1a80 [ 25.629098] ? ep_free+0xf4/0x320 [ 25.629105] ? print_irqtrace_events+0x270/0x270 [ 25.629109] ? ep_free+0xf4/0x320 [ 25.629117] lock_acquire+0x1d5/0x580 [ 25.629123] ? lock_acquire+0x1d5/0x580 [ 25.629129] ? remove_wait_queue+0x81/0x350 [ 25.629137] ? lock_release+0xa40/0xa40 [ 25.629145] ? lock_acquire+0x1d5/0x580 [ 25.629151] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.629156] ? lock_acquire+0x1d5/0x580 [ 25.629162] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.629170] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.629175] ? remove_wait_queue+0x81/0x350 [ 25.629182] remove_wait_queue+0x81/0x350 [ 25.629187] ? depot_save_stack+0x3b5/0x490 [ 25.629194] ? add_wait_queue+0x290/0x290 [ 25.629200] ? rcutorture_record_progress+0x10/0x10 [ 25.629206] ? lock_release+0xa40/0xa40 [ 25.629214] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.629221] ? __kernel_text_address+0xd/0x40 [ 25.629229] ? clear_tfile_check_list+0x370/0x370 [ 25.629236] ? check_noncircular+0x20/0x20 [ 25.629244] ? locks_remove_file+0x3fa/0x5a0 [ 25.629253] ep_free+0x13f/0x320 [ 25.629259] ? ep_remove+0x800/0x800 [ 25.629265] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.629272] ? ep_free+0x320/0x320 [ 25.629278] ep_eventpoll_release+0x44/0x60 [ 25.629284] __fput+0x327/0x7e0 [ 25.629293] ? fput+0x140/0x140 [ 25.629300] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.629308] ____fput+0x15/0x20 [ 25.629314] task_work_run+0x199/0x270 [ 25.629322] ? task_work_cancel+0x210/0x210 [ 25.629328] ? _raw_spin_unlock+0x22/0x30 [ 25.629334] ? switch_task_namespaces+0x87/0xc0 [ 25.629341] do_exit+0x9bb/0x1ad0 [ 25.629347] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.629355] ? mm_update_next_owner+0x930/0x930 [ 25.629364] ? do_raw_spin_trylock+0x190/0x190 [ 25.629371] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.629377] ? check_noncircular+0x20/0x20 [ 25.629384] ? _raw_spin_unlock+0x22/0x30 [ 25.629390] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.629397] ? check_noncircular+0x20/0x20 [ 25.629402] ? __pmd_alloc+0x4e0/0x4e0 [ 25.629407] ? lock_downgrade+0x980/0x980 [ 25.629415] ? find_held_lock+0x35/0x1d0 [ 25.629424] ? handle_mm_fault+0x248/0x8d0 [ 25.629430] ? find_held_lock+0x35/0x1d0 [ 25.629439] ? __do_page_fault+0x5f7/0xc90 [ 25.629445] ? lock_downgrade+0x980/0x980 [ 25.629454] ? handle_mm_fault+0x410/0x8d0 [ 25.629459] ? down_read_trylock+0xdb/0x170 [ 25.629465] ? __do_page_fault+0x32d/0xc90 [ 25.629471] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.629476] ? vmacache_find+0x5f/0x280 [ 25.629484] do_group_exit+0x149/0x400 [ 25.629490] ? __do_page_fault+0x3d6/0xc90 [ 25.629496] ? SyS_exit+0x30/0x30 [ 25.629504] ? do_fast_syscall_32+0x156/0xf9d [ 25.629510] ? do_group_exit+0x400/0x400 [ 25.629516] SyS_exit_group+0x1d/0x20 [ 25.629522] do_fast_syscall_32+0x3ee/0xf9d [ 25.629530] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.629536] ? kasan_check_read+0x11/0x20 [ 25.629543] ? syscall_return_slowpath+0x550/0x550 [ 25.629550] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.629561] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.629566] ? SyS_read+0x184/0x220 [ 25.629571] ? retint_user+0x18/0x18 [ 25.629579] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.629587] entry_SYSENTER_compat+0x54/0x63 [ 25.629591] RIP: 0023:0xf7f30c79 [ 25.629594] RSP: 002b:00000000ff8feaec EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 25.629599] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.629603] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 25.629606] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.629608] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.629611] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.647380] Dumping ftrace buffer: [ 25.647383] (ftrace buffer empty) [ 25.647385] Kernel Offset: disabled [ 26.930898] Rebooting in 86400 seconds..