[....] Starting enhanced syslogd: rsyslogd[ 12.560891] audit: type=1400 audit(1515879541.527:4): 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 mcstransd:
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] 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 '10.128.0.50' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 27.735111] ==================================================================
[ 27.742506] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 27.749146] Read of size 8 at addr ffff8801c8297c38 by task syzkaller246716/3335
[ 27.756655]
[ 27.758266] CPU: 0 PID: 3335 Comm: syzkaller246716 Not tainted 4.9.76-g8e170a5 #11
[ 27.765997] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 27.775336] ffff8801c83978e0 ffffffff81d93149 ffffea000720a580 ffff8801c8297c38
[ 27.783339] 0000000000000000 ffff8801c8297c38 ffff8801c8297c38 ffff8801c8397918
[ 27.791293] ffffffff8153cb43 ffff8801c8297c38 0000000000000008 0000000000000000
[ 27.799264] Call Trace:
[ 27.801833] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 27.807174] [<ffffffff8153cb43>] print_address_description+0x73/0x280
[ 27.813848] [<ffffffff8153d065>] kasan_report+0x275/0x360
[ 27.819453] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 27.825580] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 27.832305] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 27.838330] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 27.844368] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 27.851355] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 27.858343] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 27.865324] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 27.871263] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 27.877461] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 27.883061] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 27.889085] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 27.895381] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 27.901414] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 27.907265] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 27.914248] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 27.921501] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 27.926842] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 27.931911] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 27.937242] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 27.943365] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 27.948435] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 27.953514] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 27.959201] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 27.964456] [<ffffffff81be9475>] ? selinux_file_ioctl+0x355/0x530
[ 27.970742] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 27.976688] [<ffffffff81652920>] ? SyS_epoll_create+0x190/0x190
[ 27.982814] [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[ 27.989447] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 27.995136] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 28.000730] [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 28.007283]
[ 28.008876] Allocated by task 3335:
[ 28.012732] save_stack_trace+0x16/0x20
[ 28.016678] save_stack+0x43/0xd0
[ 28.020112] kasan_kmalloc+0xad/0xe0
[ 28.023806] kmem_cache_alloc_trace+0xfb/0x2a0
[ 28.028366] binder_get_thread+0x15d/0x750
[ 28.032565] binder_poll+0x4a/0x210
[ 28.036158] SyS_epoll_ctl+0x11d7/0x2190
[ 28.040195] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 28.044913]
[ 28.046505] Freed by task 3335:
[ 28.049751] save_stack_trace+0x16/0x20
[ 28.053692] save_stack+0x43/0xd0
[ 28.057111] kasan_slab_free+0x72/0xc0
[ 28.060964] kfree+0x103/0x300
[ 28.064124] binder_thread_dec_tmpref+0x1cc/0x240
[ 28.068931] binder_thread_release+0x27d/0x540
[ 28.073479] binder_ioctl+0x9c0/0x11b0
[ 28.077342] do_vfs_ioctl+0x1aa/0x1140
[ 28.081196] SyS_ioctl+0x8f/0xc0
[ 28.084528] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 28.089249]
[ 28.090845] The buggy address belongs to the object at ffff8801c8297b80
[ 28.090845] which belongs to the cache kmalloc-512 of size 512
[ 28.103480] The buggy address is located 184 bytes inside of
[ 28.103480] 512-byte region [ffff8801c8297b80, ffff8801c8297d80)
[ 28.115325] The buggy address belongs to the page:
[ 28.120224] page:ffffea000720a580 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 28.130385] flags: 0x8000000000004080(slab|head)
[ 28.135104] page dumped because: kasan: bad access detected
[ 28.140797]
[ 28.142393] Memory state around the buggy address:
[ 28.147287] ffff8801c8297b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 28.154614] ffff8801c8297b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.161943] >ffff8801c8297c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.169269] ^
[ 28.174451] ffff8801c8297c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.181777] ffff8801c8297d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.189107] ==================================================================
[ 28.196519] Disabling lock debugging due to kernel taint
[ 28.201945] Kernel panic - not syncing: panic_on_warn set ...
[ 28.201945]
[ 28.209277] CPU: 0 PID: 3335 Comm: syzkaller246716 Tainted: G B 4.9.76-g8e170a5 #11
[ 28.218164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 28.227492] ffff8801c8397838 ffffffff81d93149 ffffffff84195c17 ffff8801c8397910
[ 28.235460] 0000000000000000 ffff8801c8297c38 ffff8801c8297c38 ffff8801c8397900
[ 28.243412] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5
[ 28.251379] Call Trace:
[ 28.253946] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 28.259277] [<ffffffff8142e371>] panic+0x1bc/0x3a8
[ 28.264262] [<ffffffff8142e1b5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 28.272470] [<ffffffff8112f980>] ? add_taint+0x40/0x50
[ 28.277802] [<ffffffff8153cab0>] kasan_end_report+0x50/0x50
[ 28.283574] [<ffffffff8153cf57>] kasan_report+0x167/0x360
[ 28.289165] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 28.295277] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 28.301998] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 28.307945] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 28.313968] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 28.320956] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 28.327937] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 28.334930] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 28.340872] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 28.347079] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 28.352684] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 28.358719] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 28.365002] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 28.371027] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 28.376879] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 28.383872] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 28.391113] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 28.396451] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 28.401696] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 28.407027] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 28.413141] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 28.418222] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 28.423294] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 28.428985] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 28.434242] [<ffffffff81be9475>] ? selinux_file_ioctl+0x355/0x530
[ 28.440527] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 28.446468] [<ffffffff81652920>] ? SyS_epoll_create+0x190/0x190
[ 28.452582] [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[ 28.459228] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 28.464905] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 28.470496] [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 28.477077] Dumping ftrace buffer:
[ 28.480602] (ftrace buffer empty)
[ 28.484280] Kernel Offset: disabled
[ 28.487874] Rebooting in 86400 seconds..