[?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. [ 13.061859] audit: type=1400 audit(1514838402.471:6): avc: denied { map } for pid=3451 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.206' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.140184] audit: type=1400 audit(1514838424.550:7): avc: denied { map } for pid=3470 comm="syzkaller179907" path="/root/syzkaller179907632" 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 [ 35.143756] ================================================================== [ 35.143767] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 35.143770] Read of size 8 at addr ffff8801cada40f0 by task syzkaller179907/3470 [ 35.143771] [ 35.143777] CPU: 1 PID: 3470 Comm: syzkaller179907 Not tainted 4.15.0-rc6+ #155 [ 35.143779] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.143781] Call Trace: [ 35.143788] dump_stack+0x194/0x257 [ 35.143793] ? arch_local_irq_restore+0x53/0x53 [ 35.143799] ? show_regs_print_info+0x18/0x18 [ 35.143802] ? print_irqtrace_events+0x270/0x270 [ 35.143806] ? __lock_acquire+0x664/0x3e00 [ 35.143810] ? __lock_acquire+0x3d4d/0x3e00 [ 35.143817] print_address_description+0x73/0x250 [ 35.143821] ? __lock_acquire+0x3d4d/0x3e00 [ 35.143825] kasan_report+0x25b/0x340 [ 35.143830] __asan_report_load8_noabort+0x14/0x20 [ 35.143834] __lock_acquire+0x3d4d/0x3e00 [ 35.143837] ? __lock_acquire+0x664/0x3e00 [ 35.143841] ? lock_downgrade+0x980/0x980 [ 35.143844] ? lock_downgrade+0x980/0x980 [ 35.143848] ? print_irqtrace_events+0x270/0x270 [ 35.143852] ? remove_wait_queue+0x81/0x350 [ 35.143858] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 35.143862] ? __lock_acquire+0x664/0x3e00 [ 35.143865] ? check_noncircular+0x20/0x20 [ 35.143872] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 35.143876] ? lock_acquire+0x1d5/0x580 [ 35.143879] ? lock_acquire+0x1d5/0x580 [ 35.143885] ? ep_free+0xf4/0x320 [ 35.143889] ? lock_release+0xa40/0xa40 [ 35.143894] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 35.143897] ? print_irqtrace_events+0x270/0x270 [ 35.143901] ? print_irqtrace_events+0x270/0x270 [ 35.143907] ? rcu_note_context_switch+0x710/0x710 [ 35.143912] ? __might_sleep+0x95/0x190 [ 35.143915] ? ep_free+0xf4/0x320 [ 35.143920] ? __mutex_lock+0x16f/0x1a80 [ 35.143923] ? ep_free+0xf4/0x320 [ 35.143927] ? print_irqtrace_events+0x270/0x270 [ 35.143930] ? ep_free+0xf4/0x320 [ 35.143935] lock_acquire+0x1d5/0x580 [ 35.143938] ? lock_acquire+0x1d5/0x580 [ 35.143941] ? remove_wait_queue+0x81/0x350 [ 35.143946] ? lock_release+0xa40/0xa40 [ 35.143951] ? lock_acquire+0x1d5/0x580 [ 35.143955] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 35.143958] ? lock_acquire+0x1d5/0x580 [ 35.143961] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 35.143967] _raw_spin_lock_irqsave+0x96/0xc0 [ 35.143970] ? remove_wait_queue+0x81/0x350 [ 35.143974] remove_wait_queue+0x81/0x350 [ 35.143980] ? depot_save_stack+0x3b5/0x490 [ 35.143986] ? add_wait_queue+0x290/0x290 [ 35.143991] ? rcutorture_record_progress+0x10/0x10 [ 35.143995] ? lock_release+0xa40/0xa40 [ 35.144000] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 35.144008] ? __kernel_text_address+0xd/0x40 [ 35.144013] ? clear_tfile_check_list+0x370/0x370 [ 35.144017] ? check_noncircular+0x20/0x20 [ 35.144023] ? locks_remove_file+0x3fa/0x5a0 [ 35.144028] ep_free+0x13f/0x320 [ 35.144032] ? ep_remove+0x800/0x800 [ 35.144035] ? fsnotify_first_mark+0x2b0/0x2b0 [ 35.144040] ? ep_free+0x320/0x320 [ 35.144043] ep_eventpoll_release+0x44/0x60 [ 35.144049] __fput+0x327/0x7e0 [ 35.144054] ? fput+0x140/0x140 [ 35.144058] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.144062] ____fput+0x15/0x20 [ 35.144066] task_work_run+0x199/0x270 [ 35.144071] ? task_work_cancel+0x210/0x210 [ 35.144075] ? _raw_spin_unlock+0x22/0x30 [ 35.144079] ? switch_task_namespaces+0x87/0xc0 [ 35.144085] do_exit+0x9bb/0x1ad0 [ 35.144090] ? __handle_mm_fault+0x2330/0x3ce0 [ 35.144095] ? mm_update_next_owner+0x930/0x930 [ 35.144101] ? do_raw_spin_trylock+0x190/0x190 [ 35.144105] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 35.144108] ? check_noncircular+0x20/0x20 [ 35.144113] ? _raw_spin_unlock+0x22/0x30 [ 35.144116] ? __handle_mm_fault+0x80e/0x3ce0 [ 35.144121] ? check_noncircular+0x20/0x20 [ 35.144124] ? __pmd_alloc+0x4e0/0x4e0 [ 35.144127] ? lock_downgrade+0x980/0x980 [ 35.144131] ? find_held_lock+0x35/0x1d0 [ 35.144136] ? handle_mm_fault+0x248/0x8d0 [ 35.144140] ? find_held_lock+0x35/0x1d0 [ 35.144147] ? __do_page_fault+0x5f7/0xc90 [ 35.144151] ? lock_downgrade+0x980/0x980 [ 35.144156] ? handle_mm_fault+0x410/0x8d0 [ 35.144159] ? down_read_trylock+0xdb/0x170 [ 35.144162] ? __do_page_fault+0x32d/0xc90 [ 35.144166] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 35.144170] ? vmacache_find+0x5f/0x280 [ 35.144175] do_group_exit+0x149/0x400 [ 35.144179] ? __do_page_fault+0x3d6/0xc90 [ 35.144182] ? SyS_exit+0x30/0x30 [ 35.144188] ? do_fast_syscall_32+0x156/0xf9d [ 35.144192] ? do_group_exit+0x400/0x400 [ 35.144195] SyS_exit_group+0x1d/0x20 [ 35.144199] do_fast_syscall_32+0x3ee/0xf9d [ 35.144204] ? do_int80_syscall_32+0x9d0/0x9d0 [ 35.144208] ? kasan_check_read+0x11/0x20 [ 35.144212] ? syscall_return_slowpath+0x550/0x550 [ 35.144216] ? SyS_rt_sigaction+0x94/0x1b0 [ 35.144220] ? SyS_sigprocmask+0x4b0/0x4b0 [ 35.144223] ? SyS_read+0x184/0x220 [ 35.144227] ? retint_user+0x18/0x18 [ 35.144232] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.144237] entry_SYSENTER_compat+0x54/0x63 [ 35.144241] RIP: 0023:0xf7f9cc79 [ 35.144243] RSP: 002b:00000000ffe1a3fc EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 35.144247] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 35.144249] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 35.144251] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 35.144253] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 35.144254] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 35.144259] [ 35.144261] Allocated by task 3470: [ 35.144264] save_stack+0x43/0xd0 [ 35.144267] kasan_kmalloc+0xad/0xe0 [ 35.144270] kmem_cache_alloc_trace+0x136/0x750 [ 35.144274] binder_get_thread+0x1cf/0x870 [ 35.144276] binder_poll+0x8c/0x390 [ 35.144280] ep_item_poll.isra.10+0xec/0x320 [ 35.144282] ep_insert+0x6a3/0x1b10 [ 35.144286] SyS_epoll_ctl+0x12e4/0x1ab0 [ 35.144289] do_fast_syscall_32+0x3ee/0xf9d [ 35.144292] entry_SYSENTER_compat+0x54/0x63 [ 35.144293] [ 35.144294] Freed by task 3470: [ 35.144296] save_stack+0x43/0xd0 [ 35.144299] kasan_slab_free+0x71/0xc0 [ 35.144302] kfree+0xd6/0x260 [ 35.144304] binder_thread_dec_tmpref+0x27f/0x310 [ 35.144307] binder_thread_release+0x27d/0x540 [ 35.144309] binder_ioctl+0xc02/0x1417 [ 35.144313] compat_SyS_ioctl+0x151/0x2a30 [ 35.144316] do_fast_syscall_32+0x3ee/0xf9d [ 35.144319] entry_SYSENTER_compat+0x54/0x63 [ 35.144320] [ 35.144322] The buggy address belongs to the object at ffff8801cada4040 [ 35.144322] which belongs to the cache kmalloc-512 of size 512 [ 35.144325] The buggy address is located 176 bytes inside of [ 35.144325] 512-byte region [ffff8801cada4040, ffff8801cada4240) [ 35.144326] The buggy address belongs to the page: [ 35.144329] page:0000000026e249c5 count:1 mapcount:0 mapping:00000000569a595b index:0x0 [ 35.144333] flags: 0x2fffc0000000100(slab) [ 35.144339] raw: 02fffc0000000100 ffff8801cada4040 0000000000000000 0000000100000006 [ 35.144343] raw: ffffea00072b6a60 ffffea00072b8960 ffff8801dac00940 0000000000000000 [ 35.144344] page dumped because: kasan: bad access detected [ 35.144345] [ 35.144346] Memory state around the buggy address: [ 35.144349] ffff8801cada3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.144351] ffff8801cada4000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 35.144354] >ffff8801cada4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.144355] ^ [ 35.144358] ffff8801cada4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.144360] ffff8801cada4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.144361] ================================================================== [ 35.144362] Disabling lock debugging due to kernel taint [ 35.144365] Kernel panic - not syncing: panic_on_warn set ... [ 35.144365] [ 35.144368] CPU: 1 PID: 3470 Comm: syzkaller179907 Tainted: G B 4.15.0-rc6+ #155 [ 35.144370] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.144371] Call Trace: [ 35.144375] dump_stack+0x194/0x257 [ 35.144379] ? arch_local_irq_restore+0x53/0x53 [ 35.144383] ? kasan_end_report+0x32/0x50 [ 35.144386] ? lock_downgrade+0x980/0x980 [ 35.144391] ? vsnprintf+0x1ed/0x1900 [ 35.144395] ? __lock_acquire+0x3c70/0x3e00 [ 35.144398] panic+0x1e4/0x41c [ 35.144401] ? refcount_error_report+0x214/0x214 [ 35.144405] ? add_taint+0x40/0x50 [ 35.144408] ? add_taint+0x1c/0x50 [ 35.144412] ? __lock_acquire+0x3d4d/0x3e00 [ 35.144416] kasan_end_report+0x50/0x50 [ 35.144419] kasan_report+0x144/0x340 [ 35.144424] __asan_report_load8_noabort+0x14/0x20 [ 35.144427] __lock_acquire+0x3d4d/0x3e00 [ 35.144430] ? __lock_acquire+0x664/0x3e00 [ 35.144434] ? lock_downgrade+0x980/0x980 [ 35.144437] ? lock_downgrade+0x980/0x980 [ 35.144440] ? print_irqtrace_events+0x270/0x270 [ 35.144444] ? remove_wait_queue+0x81/0x350 [ 35.144449] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 35.144453] ? __lock_acquire+0x664/0x3e00 [ 35.144456] ? check_noncircular+0x20/0x20 [ 35.144462] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 35.144466] ? lock_acquire+0x1d5/0x580 [ 35.144470] ? lock_acquire+0x1d5/0x580 [ 35.144473] ? ep_free+0xf4/0x320 [ 35.144477] ? lock_release+0xa40/0xa40 [ 35.144481] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 35.144484] ? print_irqtrace_events+0x270/0x270 [ 35.144487] ? print_irqtrace_events+0x270/0x270 [ 35.144491] ? rcu_note_context_switch+0x710/0x710 [ 35.144495] ? __might_sleep+0x95/0x190 [ 35.144499] ? ep_free+0xf4/0x320 [ 35.144502] ? __mutex_lock+0x16f/0x1a80 [ 35.144505] ? ep_free+0xf4/0x320 [ 35.144509] ? print_irqtrace_events+0x270/0x270 [ 35.144511] ? ep_free+0xf4/0x320 [ 35.144516] lock_acquire+0x1d5/0x580 [ 35.144519] ? lock_acquire+0x1d5/0x580 [ 35.144523] ? remove_wait_queue+0x81/0x350 [ 35.144532] ? lock_release+0xa40/0xa40 [ 35.144537] ? lock_acquire+0x1d5/0x580 [ 35.144540] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 35.144543] ? lock_acquire+0x1d5/0x580 [ 35.144547] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 35.144551] _raw_spin_lock_irqsave+0x96/0xc0 [ 35.144555] ? remove_wait_queue+0x81/0x350 [ 35.144559] remove_wait_queue+0x81/0x350 [ 35.144562] ? depot_save_stack+0x3b5/0x490 [ 35.144566] ? add_wait_queue+0x290/0x290 [ 35.144569] ? rcutorture_record_progress+0x10/0x10 [ 35.144573] ? lock_release+0xa40/0xa40 [ 35.144578] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 35.144582] ? __kernel_text_address+0xd/0x40 [ 35.144586] ? clear_tfile_check_list+0x370/0x370 [ 35.144591] ? check_noncircular+0x20/0x20 [ 35.144595] ? locks_remove_file+0x3fa/0x5a0 [ 35.144600] ep_free+0x13f/0x320 [ 35.144604] ? ep_remove+0x800/0x800 [ 35.144607] ? fsnotify_first_mark+0x2b0/0x2b0 [ 35.144611] ? ep_free+0x320/0x320 [ 35.144615] ep_eventpoll_release+0x44/0x60 [ 35.144619] __fput+0x327/0x7e0 [ 35.144623] ? fput+0x140/0x140 [ 35.144627] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.144632] ____fput+0x15/0x20 [ 35.144636] task_work_run+0x199/0x270 [ 35.144640] ? task_work_cancel+0x210/0x210 [ 35.144644] ? _raw_spin_unlock+0x22/0x30 [ 35.144647] ? switch_task_namespaces+0x87/0xc0 [ 35.144652] do_exit+0x9bb/0x1ad0 [ 35.144655] ? __handle_mm_fault+0x2330/0x3ce0 [ 35.144659] ? mm_update_next_owner+0x930/0x930 [ 35.144665] ? do_raw_spin_trylock+0x190/0x190 [ 35.144669] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 35.144672] ? check_noncircular+0x20/0x20 [ 35.144676] ? _raw_spin_unlock+0x22/0x30 [ 35.144680] ? __handle_mm_fault+0x80e/0x3ce0 [ 35.144684] ? check_noncircular+0x20/0x20 [ 35.144687] ? __pmd_alloc+0x4e0/0x4e0 [ 35.144690] ? lock_downgrade+0x980/0x980 [ 35.144695] ? find_held_lock+0x35/0x1d0 [ 35.144699] ? handle_mm_fault+0x248/0x8d0 [ 35.144703] ? find_held_lock+0x35/0x1d0 [ 35.144708] ? __do_page_fault+0x5f7/0xc90 [ 35.144712] ? lock_downgrade+0x980/0x980 [ 35.144717] ? handle_mm_fault+0x410/0x8d0 [ 35.144720] ? down_read_trylock+0xdb/0x170 [ 35.144723] ? __do_page_fault+0x32d/0xc90 [ 35.144727] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 35.144730] ? vmacache_find+0x5f/0x280 [ 35.144735] do_group_exit+0x149/0x400 [ 35.144739] ? __do_page_fault+0x3d6/0xc90 [ 35.144742] ? SyS_exit+0x30/0x30 [ 35.144747] ? do_fast_syscall_32+0x156/0xf9d [ 35.144750] ? do_group_exit+0x400/0x400 [ 35.144754] SyS_exit_group+0x1d/0x20 [ 35.144757] do_fast_syscall_32+0x3ee/0xf9d [ 35.144762] ? do_int80_syscall_32+0x9d0/0x9d0 [ 35.144765] ? kasan_check_read+0x11/0x20 [ 35.144769] ? syscall_return_slowpath+0x550/0x550 [ 35.144773] ? SyS_rt_sigaction+0x94/0x1b0 [ 35.144777] ? SyS_sigprocmask+0x4b0/0x4b0 [ 35.144780] ? SyS_read+0x184/0x220 [ 35.144784] ? retint_user+0x18/0x18 [ 35.144788] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.144794] entry_SYSENTER_compat+0x54/0x63 [ 35.144796] RIP: 0023:0xf7f9cc79 [ 35.144798] RSP: 002b:00000000ffe1a3fc EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 35.144801] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 35.144803] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 35.144805] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 35.144807] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 35.144809] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 35.166258] Dumping ftrace buffer: [ 35.166262] (ftrace buffer empty) [ 35.166264] Kernel Offset: disabled [ 36.448397] Rebooting in 86400 seconds..