[....] Starting enhanced syslogd: rsyslogd[ 12.133007] audit: type=1400 audit(1513759560.764:5): avc: denied { syslog } for pid=2992 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: [ 16.474336] audit: type=1400 audit(1513759565.105:6): avc: denied { map } for pid=3131 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 'ci-upstream-mmots-kasan-gce-7,10.128.0.21' (ECDSA) to the list of known hosts. executing program [ 22.904382] audit: type=1400 audit(1513759571.536:7): avc: denied { map } for pid=3145 comm="syzkaller682129" path="/root/syzkaller682129479" 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 [ 22.909885] ================================================================== [ 22.909900] BUG: KASAN: use-after-free in __lock_acquire+0x465e/0x47f0 [ 22.909905] Read of size 8 at addr ffff8801c53243f8 by task syzkaller682129/3145 [ 22.909907] [ 22.909914] CPU: 1 PID: 3145 Comm: syzkaller682129 Not tainted 4.15.0-rc2-mm1+ #39 [ 22.909917] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.909920] Call Trace: [ 22.909930] dump_stack+0x194/0x257 [ 22.909938] ? arch_local_irq_restore+0x53/0x53 [ 22.909945] ? show_regs_print_info+0x18/0x18 [ 22.909951] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 22.909957] ? __lock_acquire+0x6e9/0x47f0 [ 22.909964] ? __lock_acquire+0x465e/0x47f0 [ 22.909973] print_address_description+0x73/0x250 [ 22.909979] ? __lock_acquire+0x465e/0x47f0 [ 22.909985] kasan_report+0x25b/0x340 [ 22.909992] __asan_report_load8_noabort+0x14/0x20 [ 22.909998] __lock_acquire+0x465e/0x47f0 [ 22.910007] ? __lock_acquire+0x6e9/0x47f0 [ 22.910016] ? __save_stack_trace+0x61/0xd0 [ 22.910027] ? __is_insn_slot_addr+0x1fc/0x330 [ 22.910035] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 22.910040] ? __lock_acquire+0x6e9/0x47f0 [ 22.910047] ? lock_release+0xda0/0xda0 [ 22.910056] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 22.910066] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 22.910072] ? lock_acquire+0x1d5/0x580 [ 22.910078] ? ep_free+0xfa/0x300 [ 22.910087] ? lock_release+0xda0/0xda0 [ 22.910096] ? rcu_note_context_switch+0x710/0x710 [ 22.910105] ? __might_sleep+0x95/0x190 [ 22.910111] ? ep_free+0xfa/0x300 [ 22.910117] ? __mutex_lock+0x16f/0x1a80 [ 22.910122] ? ep_free+0xfa/0x300 [ 22.910130] ? unwind_get_return_address+0x61/0xa0 [ 22.910136] ? ep_free+0xfa/0x300 [ 22.910144] lock_acquire+0x1d5/0x580 [ 22.910151] ? remove_wait_queue+0x81/0x350 [ 22.910157] ? save_stack_trace+0x1a/0x20 [ 22.910162] ? __lock_acquire+0x324e/0x47f0 [ 22.910169] ? lock_release+0xda0/0xda0 [ 22.910176] ? save_stack_trace+0x1a/0x20 [ 22.910181] ? __lock_acquire+0x324e/0x47f0 [ 22.910188] ? lock_acquire+0x1d5/0x580 [ 22.910194] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 22.910202] _raw_spin_lock_irqsave+0x96/0xc0 [ 22.910208] ? remove_wait_queue+0x81/0x350 [ 22.910214] remove_wait_queue+0x81/0x350 [ 22.910222] ? add_wait_queue+0x290/0x290 [ 22.910228] ? rcutorture_record_progress+0x10/0x10 [ 22.910237] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 22.910245] ? __kernel_text_address+0xd/0x40 [ 22.910253] ? clear_tfile_check_list+0x370/0x370 [ 22.910260] ? check_noncircular+0x20/0x20 [ 22.910269] ? free_fs_struct+0x52/0x60 [ 22.910275] ? locks_remove_file+0x3fa/0x5a0 [ 22.910284] ep_free+0x135/0x300 [ 22.910290] ? ep_remove+0x810/0x810 [ 22.910297] ? fsnotify_first_mark+0x2b0/0x2b0 [ 22.910304] ? ep_free+0x300/0x300 [ 22.910310] ep_eventpoll_release+0x44/0x60 [ 22.910316] __fput+0x333/0x7f0 [ 22.910324] ? fput+0x140/0x140 [ 22.910331] ? _raw_spin_unlock_irq+0x27/0x70 [ 22.910339] ____fput+0x15/0x20 [ 22.910345] task_work_run+0x199/0x270 [ 22.910353] ? task_work_cancel+0x210/0x210 [ 22.910359] ? _raw_spin_unlock+0x22/0x30 [ 22.910365] ? switch_task_namespaces+0x87/0xc0 [ 22.910374] do_exit+0x9bb/0x1ae0 [ 22.910383] ? binder_ioctl+0x561/0x141a [ 22.910389] ? mm_update_next_owner+0x930/0x930 [ 22.910397] ? binder_ioctl_write_read.isra.41+0xcb0/0xcb0 [ 22.910407] ? avc_ss_reset+0x110/0x110 [ 22.910413] ? mutex_unlock+0xd/0x10 [ 22.910427] ? down_read_trylock+0xdb/0x170 [ 22.910441] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 22.910445] ? up_read+0x1a/0x40 [ 22.910452] ? rcu_note_context_switch+0x710/0x710 [ 22.910459] ? __fd_install+0x288/0x740 [ 22.910468] ? binder_ioctl_write_read.isra.41+0xcb0/0xcb0 [ 22.910475] ? do_vfs_ioctl+0x492/0x1530 [ 22.910480] ? _cond_resched+0x14/0x30 [ 22.910488] ? ioctl_preallocate+0x2b0/0x2b0 [ 22.910496] ? selinux_capable+0x40/0x40 [ 22.910502] ? __alloc_fd+0x750/0x750 [ 22.910511] do_group_exit+0x149/0x400 [ 22.910517] ? SyS_exit+0x30/0x30 [ 22.910524] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 22.910532] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 22.910540] SyS_exit_group+0x1d/0x20 [ 22.910547] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 22.910551] RIP: 0033:0x4429f8 [ 22.910554] RSP: 002b:00007ffd33a44ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 22.910561] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004429f8 [ 22.910564] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 22.910568] RBP: 00000000006ce018 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 22.910571] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 22.910574] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 22.910582] [ 22.910585] Allocated by task 3145: [ 22.910591] save_stack+0x43/0xd0 [ 22.910595] kasan_kmalloc+0xad/0xe0 [ 22.910602] kmem_cache_alloc_trace+0x136/0x750 [ 22.910607] binder_get_thread+0x1cf/0x870 [ 22.910612] binder_poll+0x8c/0x390 [ 22.910617] ep_item_poll.isra.10+0xf2/0x320 [ 22.910621] ep_insert+0x6a2/0x1b50 [ 22.910625] SyS_epoll_ctl+0x129b/0x1a60 [ 22.910631] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 22.910632] [ 22.910634] Freed by task 3145: [ 22.910638] save_stack+0x43/0xd0 [ 22.910643] kasan_slab_free+0x71/0xc0 [ 22.910648] kfree+0xca/0x250 [ 22.910653] binder_thread_dec_tmpref+0x27f/0x310 [ 22.910658] binder_thread_release+0x27d/0x540 [ 22.910663] binder_ioctl+0xc05/0x141a [ 22.910668] do_vfs_ioctl+0x1b1/0x1530 [ 22.910673] SyS_ioctl+0x8f/0xc0 [ 22.910678] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 22.910679] [ 22.910684] The buggy address belongs to the object at ffff8801c5324340 [ 22.910684] which belongs to the cache kmalloc-512 of size 512 [ 22.910688] The buggy address is located 184 bytes inside of [ 22.910688] 512-byte region [ffff8801c5324340, ffff8801c5324540) [ 22.910690] The buggy address belongs to the page: [ 22.910696] page:000000005694e13f count:1 mapcount:0 mapping:0000000083623639 index:0x0 [ 22.910701] flags: 0x2fffc0000000100(slab) [ 22.910709] raw: 02fffc0000000100 ffff8801c53240c0 0000000000000000 0000000100000006 [ 22.910716] raw: ffffea0007147d60 ffffea000714c9e0 ffff8801dac00940 0000000000000000 [ 22.910718] page dumped because: kasan: bad access detected [ 22.910719] [ 22.910721] Memory state around the buggy address: [ 22.910725] ffff8801c5324280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 22.910730] ffff8801c5324300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 22.910734] >ffff8801c5324380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.910736] ^ [ 22.910741] ffff8801c5324400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.910745] ffff8801c5324480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.910747] ================================================================== [ 22.910749] Disabling lock debugging due to kernel taint [ 22.910752] Kernel panic - not syncing: panic_on_warn set ... [ 22.910752] [ 22.910758] CPU: 1 PID: 3145 Comm: syzkaller682129 Tainted: G B 4.15.0-rc2-mm1+ #39 [ 22.910761] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.910762] Call Trace: [ 22.910768] dump_stack+0x194/0x257 [ 22.910775] ? arch_local_irq_restore+0x53/0x53 [ 22.910782] ? vprintk_default+0x28/0x30 [ 22.910788] ? vsnprintf+0x1ed/0x1900 [ 22.910794] ? __lock_acquire+0x45b0/0x47f0 [ 22.910800] panic+0x1e4/0x41c [ 22.910805] ? refcount_error_report+0x214/0x214 [ 22.910813] ? add_taint+0x40/0x50 [ 22.910818] ? add_taint+0x1c/0x50 [ 22.910824] ? __lock_acquire+0x465e/0x47f0 [ 22.910830] kasan_end_report+0x50/0x50 [ 22.910836] kasan_report+0x144/0x340 [ 22.910843] __asan_report_load8_noabort+0x14/0x20 [ 22.910849] __lock_acquire+0x465e/0x47f0 [ 22.910854] ? __lock_acquire+0x6e9/0x47f0 [ 22.910861] ? __save_stack_trace+0x61/0xd0 [ 22.910868] ? __is_insn_slot_addr+0x1fc/0x330 [ 22.910877] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 22.910882] ? __lock_acquire+0x6e9/0x47f0 [ 22.910889] ? lock_release+0xda0/0xda0 [ 22.910895] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 22.910906] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 22.910911] ? lock_acquire+0x1d5/0x580 [ 22.910916] ? ep_free+0xfa/0x300 [ 22.910924] ? lock_release+0xda0/0xda0 [ 22.910931] ? rcu_note_context_switch+0x710/0x710 [ 22.910938] ? __might_sleep+0x95/0x190 [ 22.910943] ? ep_free+0xfa/0x300 [ 22.910949] ? __mutex_lock+0x16f/0x1a80 [ 22.910953] ? ep_free+0xfa/0x300 [ 22.910959] ? unwind_get_return_address+0x61/0xa0 [ 22.910964] ? ep_free+0xfa/0x300 [ 22.910972] lock_acquire+0x1d5/0x580 [ 22.910978] ? remove_wait_queue+0x81/0x350 [ 22.910984] ? save_stack_trace+0x1a/0x20 [ 22.910989] ? __lock_acquire+0x324e/0x47f0 [ 22.910996] ? lock_release+0xda0/0xda0 [ 22.911002] ? save_stack_trace+0x1a/0x20 [ 22.911007] ? __lock_acquire+0x324e/0x47f0 [ 22.911014] ? lock_acquire+0x1d5/0x580 [ 22.911020] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 22.911027] _raw_spin_lock_irqsave+0x96/0xc0 [ 22.911033] ? remove_wait_queue+0x81/0x350 [ 22.911039] remove_wait_queue+0x81/0x350 [ 22.911047] ? add_wait_queue+0x290/0x290 [ 22.911052] ? rcutorture_record_progress+0x10/0x10 [ 22.911061] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 22.911067] ? __kernel_text_address+0xd/0x40 [ 22.911075] ? clear_tfile_check_list+0x370/0x370 [ 22.911082] ? check_noncircular+0x20/0x20 [ 22.911089] ? free_fs_struct+0x52/0x60 [ 22.911094] ? locks_remove_file+0x3fa/0x5a0 [ 22.911103] ep_free+0x135/0x300 [ 22.911108] ? ep_remove+0x810/0x810 [ 22.911114] ? fsnotify_first_mark+0x2b0/0x2b0 [ 22.911121] ? ep_free+0x300/0x300 [ 22.911127] ep_eventpoll_release+0x44/0x60 [ 22.911132] __fput+0x333/0x7f0 [ 22.911140] ? fput+0x140/0x140 [ 22.911147] ? _raw_spin_unlock_irq+0x27/0x70 [ 22.911154] ____fput+0x15/0x20 [ 22.911160] task_work_run+0x199/0x270 [ 22.911168] ? task_work_cancel+0x210/0x210 [ 22.911174] ? _raw_spin_unlock+0x22/0x30 [ 22.911180] ? switch_task_namespaces+0x87/0xc0 [ 22.911187] do_exit+0x9bb/0x1ae0 [ 22.911194] ? binder_ioctl+0x561/0x141a [ 22.911200] ? mm_update_next_owner+0x930/0x930 [ 22.911208] ? binder_ioctl_write_read.isra.41+0xcb0/0xcb0 [ 22.911217] ? avc_ss_reset+0x110/0x110 [ 22.911222] ? mutex_unlock+0xd/0x10 [ 22.911235] ? down_read_trylock+0xdb/0x170 [ 22.911245] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 22.911250] ? up_read+0x1a/0x40 [ 22.911256] ? rcu_note_context_switch+0x710/0x710 [ 22.911261] ? __fd_install+0x288/0x740 [ 22.911271] ? binder_ioctl_write_read.isra.41+0xcb0/0xcb0 [ 22.911276] ? do_vfs_ioctl+0x492/0x1530 [ 22.911281] ? _cond_resched+0x14/0x30 [ 22.911289] ? ioctl_preallocate+0x2b0/0x2b0 [ 22.911295] ? selinux_capable+0x40/0x40 [ 22.911302] ? __alloc_fd+0x750/0x750 [ 22.911310] do_group_exit+0x149/0x400 [ 22.911317] ? SyS_exit+0x30/0x30 [ 22.911323] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 22.911329] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 22.911337] SyS_exit_group+0x1d/0x20 [ 22.911343] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 22.911347] RIP: 0033:0x4429f8 [ 22.911350] RSP: 002b:00007ffd33a44ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 22.911355] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004429f8 [ 22.911358] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 22.911362] RBP: 00000000006ce018 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 22.911365] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 22.911368] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 22.930698] Dumping ftrace buffer: [ 22.930701] (ftrace buffer empty) [ 22.930704] Kernel Offset: disabled [ 24.044069] Rebooting in 86400 seconds..