[....] Starting enhanced syslogd: rsyslogd[ 13.325241] audit: type=1400 audit(1515664692.998:4): avc: denied { syslog } for pid=3178 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Starting mcstransd:
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.15.220' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 20.764850] ==================================================================
[ 20.772246] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 20.778888] Read of size 8 at addr ffff8801c93abc38 by task syzkaller013896/3326
[ 20.786387]
[ 20.787985] CPU: 1 PID: 3326 Comm: syzkaller013896 Not tainted 4.9.76-g9154940 #10
[ 20.795656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 20.804981] ffff8801c8f278e0 ffffffff81d93149 ffffea000724ea80 ffff8801c93abc38
[ 20.812961] 0000000000000000 ffff8801c93abc38 ffff8801c93abc38 ffff8801c8f27918
[ 20.820915] ffffffff8153cb43 ffff8801c93abc38 0000000000000008 0000000000000000
[ 20.828879] Call Trace:
[ 20.831434] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 20.836771] [<ffffffff8153cb43>] print_address_description+0x73/0x280
[ 20.843404] [<ffffffff8153d065>] kasan_report+0x275/0x360
[ 20.849092] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 20.855203] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 20.861922] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 20.867862] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 20.873891] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.880883] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.887867] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.894846] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 20.900797] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 20.907002] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 20.912603] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 20.918632] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 20.924915] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 20.930941] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 20.936822] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 20.943819] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 20.951063] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 20.956399] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 20.961489] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 20.966819] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 20.972943] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 20.978015] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 20.983084] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 20.988761] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 20.994003] [<ffffffff81be9475>] ? selinux_file_ioctl+0x355/0x530
[ 21.000289] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 21.006235] [<ffffffff81652920>] ? SyS_epoll_create+0x190/0x190
[ 21.012348] [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[ 21.018980] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 21.024666] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 21.030261] [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 21.036805]
[ 21.038403] Allocated by task 3326:
[ 21.041996] save_stack_trace+0x16/0x20
[ 21.045935] save_stack+0x43/0xd0
[ 21.049355] kasan_kmalloc+0xad/0xe0
[ 21.053040] kmem_cache_alloc_trace+0xfb/0x2a0
[ 21.057595] binder_get_thread+0x15d/0x750
[ 21.061793] binder_poll+0x4a/0x210
[ 21.065384] SyS_epoll_ctl+0x11d7/0x2190
[ 21.069411] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 21.074129]
[ 21.075721] Freed by task 3326:
[ 21.078965] save_stack_trace+0x16/0x20
[ 21.082905] save_stack+0x43/0xd0
[ 21.086321] kasan_slab_free+0x72/0xc0
[ 21.090183] kfree+0x103/0x300
[ 21.093348] binder_thread_dec_tmpref+0x1cc/0x240
[ 21.098157] binder_thread_release+0x27d/0x540
[ 21.102712] binder_ioctl+0x9c0/0x11b0
[ 21.106570] do_vfs_ioctl+0x1aa/0x1140
[ 21.110423] SyS_ioctl+0x8f/0xc0
[ 21.113761] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 21.118485]
[ 21.120079] The buggy address belongs to the object at ffff8801c93abb80
[ 21.120079] which belongs to the cache kmalloc-512 of size 512
[ 21.132714] The buggy address is located 184 bytes inside of
[ 21.132714] 512-byte region [ffff8801c93abb80, ffff8801c93abd80)
[ 21.144555] The buggy address belongs to the page:
[ 21.149465] page:ffffea000724ea80 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 21.159627] flags: 0x8000000000004080(slab|head)
[ 21.164351] page dumped because: kasan: bad access detected
[ 21.170024]
[ 21.171615] Memory state around the buggy address:
[ 21.176509] ffff8801c93abb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 21.183835] ffff8801c93abb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.191164] >ffff8801c93abc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.198498] ^
[ 21.203650] ffff8801c93abc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.210975] ffff8801c93abd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.218295] ==================================================================
[ 21.225615] Disabling lock debugging due to kernel taint
[ 21.231026] Kernel panic - not syncing: panic_on_warn set ...
[ 21.231026]
[ 21.238362] CPU: 1 PID: 3326 Comm: syzkaller013896 Tainted: G B 4.9.76-g9154940 #10
[ 21.247248] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 21.256569] ffff8801c8f27838 ffffffff81d93149 ffffffff84195c17 ffff8801c8f27910
[ 21.264529] 0000000000000000 ffff8801c93abc38 ffff8801c93abc38 ffff8801c8f27900
[ 21.272497] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5
[ 21.280464] Call Trace:
[ 21.283021] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 21.288350] [<ffffffff8142e371>] panic+0x1bc/0x3a8
[ 21.293331] [<ffffffff8142e1b5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 21.301525] [<ffffffff8112f980>] ? add_taint+0x40/0x50
[ 21.306862] [<ffffffff8153cab0>] kasan_end_report+0x50/0x50
[ 21.312629] [<ffffffff8153cf57>] kasan_report+0x167/0x360
[ 21.318219] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 21.324331] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 21.331057] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 21.336997] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 21.343024] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 21.350008] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 21.356987] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 21.363972] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 21.369913] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 21.376116] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 21.381709] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 21.387736] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 21.394020] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 21.400043] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 21.405895] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 21.412880] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 21.420120] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 21.425454] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 21.430561] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 21.435904] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 21.442028] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 21.447112] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 21.452179] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 21.457857] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 21.463106] [<ffffffff81be9475>] ? selinux_file_ioctl+0x355/0x530
[ 21.469391] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 21.475335] [<ffffffff81652920>] ? SyS_epoll_create+0x190/0x190
[ 21.481446] [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[ 21.488084] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 21.493765] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 21.499361] [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 21.506365] Dumping ftrace buffer:
[ 21.509883] (ftrace buffer empty)
[ 21.513560] Kernel Offset: disabled
[ 21.517155] Rebooting in 86400 seconds..