[....] Starting enhanced syslogd: rsyslogd[ 11.233051] audit: type=1400 audit(1515683485.701:4): avc: denied { syslog } for pid=3173 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 '10.128.15.217' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 18.842297] ==================================================================
[ 18.843445] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 18.844335] Read of size 8 at addr ffff8801c922e838 by task syzkaller989200/3321
[ 18.845332]
[ 18.845562] CPU: 0 PID: 3321 Comm: syzkaller989200 Not tainted 4.9.76-g9154940 #20
[ 18.846570] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 18.847791] ffff8801c9cf7870 ffffffff81d93149 ffffea0007248b80 ffff8801c922e838
[ 18.848916] 0000000000000000 ffff8801c922e838 ffff8801c922e838 ffff8801c9cf78a8
[ 18.850081] ffffffff8153cb43 ffff8801c922e838 0000000000000008 0000000000000000
[ 18.851228] Call Trace:
[ 18.851583] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 18.852293] [<ffffffff8153cb43>] print_address_description+0x73/0x280
[ 18.853181] [<ffffffff8153d065>] kasan_report+0x275/0x360
[ 18.853921] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 18.854771] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 18.855701] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 18.856507] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 18.857316] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 18.858235] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 18.859156] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 18.860075] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 18.860863] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 18.861693] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 18.862951] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 18.868979] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 18.875261] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 18.881297] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 18.887149] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 18.894135] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 18.901372] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 18.906705] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 18.911770] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 18.917104] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 18.923214] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 18.928286] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 18.933356] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 18.939034] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 18.944274] [<ffffffff814cd890>] ? __pmd_alloc+0x410/0x410
[ 18.949950] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 18.955893] [<ffffffff810dd65c>] ? __do_page_fault+0x5ec/0xd40
[ 18.961919] [<ffffffff8122f9da>] ? up_read+0x1a/0x40
[ 18.967077] [<ffffffff810dd42d>] ? __do_page_fault+0x3bd/0xd40
[ 18.973100] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 18.978774] [<ffffffff81141b20>] ? do_group_exit+0x320/0x320
[ 18.984621] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 18.990210] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 18.996321] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 19.002952] [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83
[ 19.009144]
[ 19.010739] Allocated by task 3321:
[ 19.014332] save_stack_trace+0x16/0x20
[ 19.018271] save_stack+0x43/0xd0
[ 19.021689] kasan_kmalloc+0xad/0xe0
[ 19.025365] kmem_cache_alloc_trace+0xfb/0x2a0
[ 19.029912] binder_get_thread+0x15d/0x750
[ 19.034109] binder_poll+0x4a/0x210
[ 19.037704] SyS_epoll_ctl+0x11d7/0x2190
[ 19.041729] do_fast_syscall_32+0x2f7/0x890
[ 19.046015] entry_SYSENTER_compat+0x74/0x83
[ 19.050384]
[ 19.051975] Freed by task 3321:
[ 19.055223] save_stack_trace+0x16/0x20
[ 19.059160] save_stack+0x43/0xd0
[ 19.062578] kasan_slab_free+0x72/0xc0
[ 19.066429] kfree+0x103/0x300
[ 19.069588] binder_thread_dec_tmpref+0x1cc/0x240
[ 19.074403] binder_thread_release+0x27d/0x540
[ 19.078954] binder_ioctl+0x9c0/0x11b0
[ 19.082807] compat_SyS_ioctl+0x15f/0x2050
[ 19.087004] do_fast_syscall_32+0x2f7/0x890
[ 19.091294] entry_SYSENTER_compat+0x74/0x83
[ 19.095663]
[ 19.097258] The buggy address belongs to the object at ffff8801c922e780
[ 19.097258] which belongs to the cache kmalloc-512 of size 512
[ 19.109891] The buggy address is located 184 bytes inside of
[ 19.109891] 512-byte region [ffff8801c922e780, ffff8801c922e980)
[ 19.121726] The buggy address belongs to the page:
[ 19.126621] page:ffffea0007248b80 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 19.136784] flags: 0x8000000000004080(slab|head)
[ 19.141508] page dumped because: kasan: bad access detected
[ 19.147181]
[ 19.148772] Memory state around the buggy address:
[ 19.153670] ffff8801c922e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 19.160992] ffff8801c922e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.168316] >ffff8801c922e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.175636] ^
[ 19.180792] ffff8801c922e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.188161] ffff8801c922e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.195485] ==================================================================
[ 19.202806] Disabling lock debugging due to kernel taint
[ 19.208221] Kernel panic - not syncing: panic_on_warn set ...
[ 19.208221]
[ 19.215551] CPU: 0 PID: 3321 Comm: syzkaller989200 Tainted: G B 4.9.76-g9154940 #20
[ 19.224446] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 19.233765] ffff8801c9cf77c8 ffffffff81d93149 ffffffff84195c17 ffff8801c9cf78a0
[ 19.241714] 0000000000000000 ffff8801c922e838 ffff8801c922e838 ffff8801c9cf7890
[ 19.249668] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5
[ 19.257617] Call Trace:
[ 19.260172] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 19.265501] [<ffffffff8142e371>] panic+0x1bc/0x3a8
[ 19.270486] [<ffffffff8142e1b5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 19.278679] [<ffffffff8112f980>] ? add_taint+0x40/0x50
[ 19.284010] [<ffffffff8153cab0>] kasan_end_report+0x50/0x50
[ 19.289772] [<ffffffff8153cf57>] kasan_report+0x167/0x360
[ 19.295361] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 19.301480] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 19.308198] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 19.314134] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 19.320157] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.327135] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.334115] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.341103] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 19.347050] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 19.353245] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 19.358832] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 19.364853] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 19.371140] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 19.377167] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 19.383018] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 19.389995] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 19.397242] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 19.402569] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 19.407635] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 19.412963] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 19.419077] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 19.424148] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 19.429217] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 19.434897] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 19.440137] [<ffffffff814cd890>] ? __pmd_alloc+0x410/0x410
[ 19.445815] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 19.451751] [<ffffffff810dd65c>] ? __do_page_fault+0x5ec/0xd40
[ 19.457773] [<ffffffff8122f9da>] ? up_read+0x1a/0x40
[ 19.462927] [<ffffffff810dd42d>] ? __do_page_fault+0x3bd/0xd40
[ 19.468948] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 19.474622] [<ffffffff81141b20>] ? do_group_exit+0x320/0x320
[ 19.480471] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 19.486063] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 19.492172] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 19.498803] [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83
[ 19.505510] Dumping ftrace buffer:
[ 19.509016] (ftrace buffer empty)
[ 19.512691] Kernel Offset: disabled
[ 19.516282] Rebooting in 86400 seconds..