[....] Starting enhanced syslogd: rsyslogd[ 12.679441] audit: type=1400 audit(1514775454.630:4): avc: denied { syslog } for pid=3166 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 '10.128.15.217' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 19.516973] ==================================================================
[ 19.524333] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 19.530961] Read of size 8 at addr ffff8801cb132838 by task syzkaller313044/3318
[ 19.538455]
[ 19.540051] CPU: 0 PID: 3318 Comm: syzkaller313044 Not tainted 4.9.73-gf3f3457 #1
[ 19.547637] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 19.556957] ffff8801ca3178e0 ffffffff81d922b9 ffffea00072c4c80 ffff8801cb132838
[ 19.564903] 0000000000000000 ffff8801cb132838 ffff8801cb132838 ffff8801ca317918
[ 19.572847] ffffffff8153bab3 ffff8801cb132838 0000000000000008 0000000000000000
[ 19.580787] Call Trace:
[ 19.583339] [<ffffffff81d922b9>] dump_stack+0xc1/0x128
[ 19.588668] [<ffffffff8153bab3>] print_address_description+0x73/0x280
[ 19.595297] [<ffffffff8153bfd5>] kasan_report+0x275/0x360
[ 19.600887] [<ffffffff8123cf1f>] ? __lock_acquire+0x2eff/0x3640
[ 19.606994] [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20
[ 19.613710] [<ffffffff8123cf1f>] __lock_acquire+0x2eff/0x3640
[ 19.619644] [<ffffffff8123a649>] ? __lock_acquire+0x629/0x3640
[ 19.625665] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.632640] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.639616] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.646593] [<ffffffff8123940f>] ? mark_held_locks+0xaf/0x100
[ 19.652528] [<ffffffff838a5e03>] ? mutex_lock_nested+0x5e3/0x870
[ 19.658723] [<ffffffff8123e09e>] lock_acquire+0x12e/0x410
[ 19.664309] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 19.670334] [<ffffffff838af3ee>] _raw_spin_lock_irqsave+0x4e/0x70
[ 19.676615] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 19.682635] [<ffffffff81222604>] remove_wait_queue+0x14/0x40
[ 19.688483] [<ffffffff8164eaef>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 19.695464] [<ffffffff8164eb6a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 19.702703] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 19.708029] [<ffffffff8164f836>] ep_free+0x96/0x1b0
[ 19.713094] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 19.718420] [<ffffffff8164f994>] ep_eventpoll_release+0x44/0x60
[ 19.724531] [<ffffffff81572f4c>] __fput+0x28c/0x6e0
[ 19.729603] [<ffffffff81573425>] ____fput+0x15/0x20
[ 19.734669] [<ffffffff81193a25>] task_work_run+0x115/0x190
[ 19.740345] [<ffffffff8113a507>] do_exit+0x7e7/0x2a40
[ 19.745587] [<ffffffff81be83e5>] ? selinux_file_ioctl+0x355/0x530
[ 19.751868] [<ffffffff81139d20>] ? release_task+0x1240/0x1240
[ 19.757803] [<ffffffff81651890>] ? SyS_epoll_create+0x190/0x190
[ 19.763914] [<ffffffff838af567>] ? entry_SYSCALL_64_fastpath+0x5/0xc6
[ 19.770544] [<ffffffff81140c18>] do_group_exit+0x108/0x320
[ 19.776220] [<ffffffff81140e4d>] SyS_exit_group+0x1d/0x20
[ 19.781808] [<ffffffff838af585>] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 19.788346]
[ 19.789938] Allocated by task 3318:
[ 19.793529] save_stack_trace+0x16/0x20
[ 19.797467] save_stack+0x43/0xd0
[ 19.800881] kasan_kmalloc+0xad/0xe0
[ 19.804557] kmem_cache_alloc_trace+0xfb/0x2a0
[ 19.809103] binder_get_thread+0x15d/0x750
[ 19.813300] binder_poll+0x4a/0x210
[ 19.816891] SyS_epoll_ctl+0x11d7/0x2190
[ 19.820914] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 19.825629]
[ 19.827219] Freed by task 3318:
[ 19.830460] save_stack_trace+0x16/0x20
[ 19.834396] save_stack+0x43/0xd0
[ 19.837813] kasan_slab_free+0x72/0xc0
[ 19.841661] kfree+0x103/0x300
[ 19.844817] binder_thread_dec_tmpref+0x1cc/0x240
[ 19.849629] binder_thread_release+0x27d/0x540
[ 19.854170] binder_ioctl+0x9c0/0x11b0
[ 19.858021] do_vfs_ioctl+0x1aa/0x1140
[ 19.861869] SyS_ioctl+0x8f/0xc0
[ 19.865198] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 19.869913]
[ 19.871503] The buggy address belongs to the object at ffff8801cb132780
[ 19.871503] which belongs to the cache kmalloc-512 of size 512
[ 19.884121] The buggy address is located 184 bytes inside of
[ 19.884121] 512-byte region [ffff8801cb132780, ffff8801cb132980)
[ 19.895958] The buggy address belongs to the page:
[ 19.900850] page:ffffea00072c4c80 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 19.910999] flags: 0x8000000000004080(slab|head)
[ 19.915714] page dumped because: kasan: bad access detected
[ 19.921384]
[ 19.922973] Memory state around the buggy address:
[ 19.927864] ffff8801cb132700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 19.935185] ffff8801cb132780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.942507] >ffff8801cb132800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.949827] ^
[ 19.954979] ffff8801cb132880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.962300] ffff8801cb132900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.969619] ==================================================================
[ 19.976937] Disabling lock debugging due to kernel taint
[ 19.982347] Kernel panic - not syncing: panic_on_warn set ...
[ 19.982347]
[ 19.989674] CPU: 0 PID: 3318 Comm: syzkaller313044 Tainted: G B 4.9.73-gf3f3457 #1
[ 19.998470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 20.007788] ffff8801ca317838 ffffffff81d922b9 ffffffff841955bf ffff8801ca317910
[ 20.015812] 0000000000000000 ffff8801cb132838 ffff8801cb132838 ffff8801ca317900
[ 20.023750] ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585
[ 20.031686] Call Trace:
[ 20.034240] [<ffffffff81d922b9>] dump_stack+0xc1/0x128
[ 20.039567] [<ffffffff8142d741>] panic+0x1bc/0x3a8
[ 20.044547] [<ffffffff8142d585>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 20.052750] [<ffffffff8112ec90>] ? add_taint+0x40/0x50
[ 20.058079] [<ffffffff8153ba20>] kasan_end_report+0x50/0x50
[ 20.063844] [<ffffffff8153bec7>] kasan_report+0x167/0x360
[ 20.069434] [<ffffffff8123cf1f>] ? __lock_acquire+0x2eff/0x3640
[ 20.075541] [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20
[ 20.082257] [<ffffffff8123cf1f>] __lock_acquire+0x2eff/0x3640
[ 20.088190] [<ffffffff8123a649>] ? __lock_acquire+0x629/0x3640
[ 20.094210] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.101620] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.108598] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.115580] [<ffffffff8123940f>] ? mark_held_locks+0xaf/0x100
[ 20.121516] [<ffffffff838a5e03>] ? mutex_lock_nested+0x5e3/0x870
[ 20.127711] [<ffffffff8123e09e>] lock_acquire+0x12e/0x410
[ 20.133298] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 20.139319] [<ffffffff838af3ee>] _raw_spin_lock_irqsave+0x4e/0x70
[ 20.145602] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 20.151623] [<ffffffff81222604>] remove_wait_queue+0x14/0x40
[ 20.157470] [<ffffffff8164eaef>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 20.164444] [<ffffffff8164eb6a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 20.171680] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 20.177006] [<ffffffff8164f836>] ep_free+0x96/0x1b0
[ 20.182069] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 20.187394] [<ffffffff8164f994>] ep_eventpoll_release+0x44/0x60
[ 20.193501] [<ffffffff81572f4c>] __fput+0x28c/0x6e0
[ 20.198566] [<ffffffff81573425>] ____fput+0x15/0x20
[ 20.203630] [<ffffffff81193a25>] task_work_run+0x115/0x190
[ 20.209305] [<ffffffff8113a507>] do_exit+0x7e7/0x2a40
[ 20.214555] [<ffffffff81be83e5>] ? selinux_file_ioctl+0x355/0x530
[ 20.220834] [<ffffffff81139d20>] ? release_task+0x1240/0x1240
[ 20.226769] [<ffffffff81651890>] ? SyS_epoll_create+0x190/0x190
[ 20.232880] [<ffffffff838af567>] ? entry_SYSCALL_64_fastpath+0x5/0xc6
[ 20.239509] [<ffffffff81140c18>] do_group_exit+0x108/0x320
[ 20.245183] [<ffffffff81140e4d>] SyS_exit_group+0x1d/0x20
[ 20.250769] [<ffffffff838af585>] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 20.257782] Dumping ftrace buffer:
[ 20.261293] (ftrace buffer empty)
[ 20.264967] Kernel Offset: disabled
[ 20.268555] Rebooting in 86400 seconds..