[....] Starting enhanced syslogd: rsyslogd[ 11.349096] audit: type=1400 audit(1515665371.759:4): avc: denied { syslog } for pid=3177 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 '10.128.0.6' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 19.470803] ==================================================================
[ 19.471852] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 19.472745] Read of size 8 at addr ffff8801c96139b8 by task syzkaller313932/3325
[ 19.473729]
[ 19.473963] CPU: 0 PID: 3325 Comm: syzkaller313932 Not tainted 4.9.76-g9154940 #10
[ 19.474971] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 19.476200] ffff8801c9ec78e0 ffffffff81d93149 ffffea0007258480 ffff8801c96139b8
[ 19.477370] 0000000000000000 ffff8801c96139b8 ffff8801c96139b8 ffff8801c9ec7918
[ 19.478521] ffffffff8153cb43 ffff8801c96139b8 0000000000000008 0000000000000000
[ 19.479690] Call Trace:
[ 19.480047] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 19.480756] [<ffffffff8153cb43>] print_address_description+0x73/0x280
[ 19.481643] [<ffffffff8153d065>] kasan_report+0x275/0x360
[ 19.482391] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 19.483221] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 19.484107] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 19.484904] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 19.485718] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.486638] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.487569] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.488498] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 19.489287] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 19.490167] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 19.490944] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 19.496966] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 19.503248] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 19.509270] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 19.515125] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 19.522103] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 19.529341] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 19.534669] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 19.539743] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 19.545079] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 19.551189] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 19.556258] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 19.562085] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 19.567773] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 19.573015] [<ffffffff81be9475>] ? selinux_file_ioctl+0x355/0x530
[ 19.580789] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 19.588728] [<ffffffff81652920>] ? SyS_epoll_create+0x190/0x190
[ 19.594840] [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[ 19.601471] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 19.607149] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 19.612740] [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 19.619281]
[ 19.620873] Allocated by task 3325:
[ 19.624467] save_stack_trace+0x16/0x20
[ 19.628405] save_stack+0x43/0xd0
[ 19.631822] kasan_kmalloc+0xad/0xe0
[ 19.635512] kmem_cache_alloc_trace+0xfb/0x2a0
[ 19.640059] binder_get_thread+0x15d/0x750
[ 19.644267] binder_poll+0x4a/0x210
[ 19.647858] SyS_epoll_ctl+0x11d7/0x2190
[ 19.651883] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 19.656600]
[ 19.658191] Freed by task 3325:
[ 19.661435] save_stack_trace+0x16/0x20
[ 19.665378] save_stack+0x43/0xd0
[ 19.668796] kasan_slab_free+0x72/0xc0
[ 19.672644] kfree+0x103/0x300
[ 19.675804] binder_thread_dec_tmpref+0x1cc/0x240
[ 19.680621] binder_thread_release+0x27d/0x540
[ 19.685166] binder_ioctl+0x9c0/0x11b0
[ 19.689022] do_vfs_ioctl+0x1aa/0x1140
[ 19.692882] SyS_ioctl+0x8f/0xc0
[ 19.696212] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 19.700930]
[ 19.702531] The buggy address belongs to the object at ffff8801c9613900
[ 19.702531] which belongs to the cache kmalloc-512 of size 512
[ 19.717059] The buggy address is located 184 bytes inside of
[ 19.717059] 512-byte region [ffff8801c9613900, ffff8801c9613b00)
[ 19.728901] The buggy address belongs to the page:
[ 19.733793] page:ffffea0007258480 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 19.743947] flags: 0x8000000000004080(slab|head)
[ 19.748662] page dumped because: kasan: bad access detected
[ 19.754335]
[ 19.755927] Memory state around the buggy address:
[ 19.760827] ffff8801c9613880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 19.768150] ffff8801c9613900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.775473] >ffff8801c9613980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.782797] ^
[ 19.789348] ffff8801c9613a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.796943] ffff8801c9613a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.804263] ==================================================================
[ 19.811584] Disabling lock debugging due to kernel taint
[ 19.816997] Kernel panic - not syncing: panic_on_warn set ...
[ 19.816997]
[ 19.824324] CPU: 0 PID: 3325 Comm: syzkaller313932 Tainted: G B 4.9.76-g9154940 #10
[ 19.833207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 19.842531] ffff8801c9ec7838 ffffffff81d93149 ffffffff84195c17 ffff8801c9ec7910
[ 19.850492] 0000000000000000 ffff8801c96139b8 ffff8801c96139b8 ffff8801c9ec7900
[ 19.858436] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5
[ 19.866376] Call Trace:
[ 19.868929] [<ffffffff81d93149>] dump_stack+0xc1/0x128
[ 19.874257] [<ffffffff8142e371>] panic+0x1bc/0x3a8
[ 19.879239] [<ffffffff8142e1b5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 19.887430] [<ffffffff8112f980>] ? add_taint+0x40/0x50
[ 19.893887] [<ffffffff8153cab0>] kasan_end_report+0x50/0x50
[ 19.899648] [<ffffffff8153cf57>] kasan_report+0x167/0x360
[ 19.905237] [<ffffffff8123dc4f>] ? __lock_acquire+0x2eff/0x3640
[ 19.912043] [<ffffffff8153d1c4>] __asan_report_load8_noabort+0x14/0x20
[ 19.918760] [<ffffffff8123dc4f>] __lock_acquire+0x2eff/0x3640
[ 19.924694] [<ffffffff8123b379>] ? __lock_acquire+0x629/0x3640
[ 19.930720] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.937706] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.944691] [<ffffffff8123ad50>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.951670] [<ffffffff8123a13f>] ? mark_held_locks+0xaf/0x100
[ 19.957610] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 19.963804] [<ffffffff8123edce>] lock_acquire+0x12e/0x410
[ 19.970086] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 19.976456] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 19.982738] [<ffffffff81223334>] ? remove_wait_queue+0x14/0x40
[ 19.988761] [<ffffffff81223334>] remove_wait_queue+0x14/0x40
[ 19.994611] [<ffffffff8164fb7f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 20.001587] [<ffffffff8164fbfa>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 20.008825] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 20.014152] [<ffffffff816508c6>] ep_free+0x96/0x1b0
[ 20.019218] [<ffffffff816509e0>] ? ep_free+0x1b0/0x1b0
[ 20.024545] [<ffffffff81650a24>] ep_eventpoll_release+0x44/0x60
[ 20.030661] [<ffffffff81573fdc>] __fput+0x28c/0x6e0
[ 20.035728] [<ffffffff815744b5>] ____fput+0x15/0x20
[ 20.040799] [<ffffffff81194745>] task_work_run+0x115/0x190
[ 20.046475] [<ffffffff8113b1f7>] do_exit+0x7e7/0x2a40
[ 20.051717] [<ffffffff81be9475>] ? selinux_file_ioctl+0x355/0x530
[ 20.057998] [<ffffffff8113aa10>] ? release_task+0x1240/0x1240
[ 20.063933] [<ffffffff81652920>] ? SyS_epoll_create+0x190/0x190
[ 20.070040] [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[ 20.076688] [<ffffffff81141908>] do_group_exit+0x108/0x320
[ 20.082362] [<ffffffff81141b3d>] SyS_exit_group+0x1d/0x20
[ 20.087951] [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[ 20.095242] Dumping ftrace buffer:
[ 20.098749] (ftrace buffer empty)
[ 20.103033] Kernel Offset: disabled
[ 20.106971] Rebooting in 86400 seconds..