[....] Starting enhanced syslogd: rsyslogd[ 10.570209] audit: type=1400 audit(1515473421.926:4): avc: denied { syslog } for pid=3185 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 '10.128.15.194' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 22.369708] ==================================================================
[ 22.370817] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 22.371732] Read of size 8 at addr ffff8801c873efb8 by task syzkaller974895/3340
[ 22.372732]
[ 22.372962] CPU: 0 PID: 3340 Comm: syzkaller974895 Not tainted 4.9.75-gb54d99a #18
[ 22.373969] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 22.375190] ffff8801c7567870 ffffffff81d93049 ffffea000721cf80 ffff8801c873efb8
[ 22.376320] 0000000000000000 ffff8801c873efb8 ffff8801c873efb8 ffff8801c75678a8
[ 22.377469] ffffffff8153ca53 ffff8801c873efb8 0000000000000008 0000000000000000
[ 22.378598] Call Trace:
[ 22.378953] [<ffffffff81d93049>] dump_stack+0xc1/0x128
[ 22.379681] [<ffffffff8153ca53>] print_address_description+0x73/0x280
[ 22.380555] [<ffffffff8153cf75>] kasan_report+0x275/0x360
[ 22.381333] [<ffffffff8123db6f>] ? __lock_acquire+0x2eff/0x3640
[ 22.382141] [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20
[ 22.383026] [<ffffffff8123db6f>] __lock_acquire+0x2eff/0x3640
[ 22.383811] [<ffffffff8123b299>] ? __lock_acquire+0x629/0x3640
[ 22.384607] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.385529] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.386449] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.387369] [<ffffffff8123a05f>] ? mark_held_locks+0xaf/0x100
[ 22.388159] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 22.388978] [<ffffffff8123ecee>] lock_acquire+0x12e/0x410
[ 22.389719] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 22.390529] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 22.396811] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 22.402832] [<ffffffff81223254>] remove_wait_queue+0x14/0x40
[ 22.408682] [<ffffffff8164fa8f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 22.415660] [<ffffffff8164fb0a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 22.422897] [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[ 22.428228] [<ffffffff816507d6>] ep_free+0x96/0x1b0
[ 22.433297] [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[ 22.438625] [<ffffffff81650934>] ep_eventpoll_release+0x44/0x60
[ 22.444740] [<ffffffff81573eec>] __fput+0x28c/0x6e0
[ 22.449809] [<ffffffff815743c5>] ____fput+0x15/0x20
[ 22.454879] [<ffffffff81194675>] task_work_run+0x115/0x190
[ 22.460566] [<ffffffff8113b157>] do_exit+0x7e7/0x2a40
[ 22.465814] [<ffffffff814cd7a0>] ? __pmd_alloc+0x410/0x410
[ 22.471491] [<ffffffff8113a970>] ? release_task+0x1240/0x1240
[ 22.477434] [<ffffffff810dd65c>] ? __do_page_fault+0x5ec/0xd40
[ 22.483465] [<ffffffff8122f8fa>] ? up_read+0x1a/0x40
[ 22.488635] [<ffffffff810dd42d>] ? __do_page_fault+0x3bd/0xd40
[ 22.494658] [<ffffffff81141868>] do_group_exit+0x108/0x320
[ 22.500334] [<ffffffff81141a80>] ? do_group_exit+0x320/0x320
[ 22.506183] [<ffffffff81141a9d>] SyS_exit_group+0x1d/0x20
[ 22.511771] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 22.517880] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 22.524511] [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83
[ 22.530705]
[ 22.532300] Allocated by task 3340:
[ 22.535895] save_stack_trace+0x16/0x20
[ 22.539835] save_stack+0x43/0xd0
[ 22.543251] kasan_kmalloc+0xad/0xe0
[ 22.546928] kmem_cache_alloc_trace+0xfb/0x2a0
[ 22.551475] binder_get_thread+0x15d/0x750
[ 22.555677] binder_poll+0x4a/0x210
[ 22.559267] SyS_epoll_ctl+0x11d7/0x2190
[ 22.563301] do_fast_syscall_32+0x2f7/0x890
[ 22.567587] entry_SYSENTER_compat+0x74/0x83
[ 22.571956]
[ 22.573546] Freed by task 3340:
[ 22.576790] save_stack_trace+0x16/0x20
[ 22.580728] save_stack+0x43/0xd0
[ 22.584149] kasan_slab_free+0x72/0xc0
[ 22.587999] kfree+0x103/0x300
[ 22.591168] binder_thread_dec_tmpref+0x1cc/0x240
[ 22.595973] binder_thread_release+0x27d/0x540
[ 22.600519] binder_ioctl+0x9c0/0x11b0
[ 22.604371] compat_SyS_ioctl+0x15f/0x2050
[ 22.608573] do_fast_syscall_32+0x2f7/0x890
[ 22.612860] entry_SYSENTER_compat+0x74/0x83
[ 22.617229]
[ 22.618823] The buggy address belongs to the object at ffff8801c873ef00
[ 22.618823] which belongs to the cache kmalloc-512 of size 512
[ 22.631442] The buggy address is located 184 bytes inside of
[ 22.631442] 512-byte region [ffff8801c873ef00, ffff8801c873f100)
[ 22.643287] The buggy address belongs to the page:
[ 22.648183] page:ffffea000721cf80 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 22.658353] flags: 0x8000000000004080(slab|head)
[ 22.663071] page dumped because: kasan: bad access detected
[ 22.668749]
[ 22.670340] Memory state around the buggy address:
[ 22.675235] ffff8801c873ee80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 22.682560] ffff8801c873ef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.689882] >ffff8801c873ef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.697216] ^
[ 22.702369] ffff8801c873f000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.709700] ffff8801c873f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.717025] ==================================================================
[ 22.724346] Disabling lock debugging due to kernel taint
[ 22.729758] Kernel panic - not syncing: panic_on_warn set ...
[ 22.729758]
[ 22.737085] CPU: 0 PID: 3340 Comm: syzkaller974895 Tainted: G B 4.9.75-gb54d99a #18
[ 22.745970] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 22.755291] ffff8801c75677c8 ffffffff81d93049 ffffffff84195be7 ffff8801c75678a0
[ 22.763241] 0000000000000000 ffff8801c873efb8 ffff8801c873efb8 ffff8801c7567890
[ 22.771198] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5
[ 22.779144] Call Trace:
[ 22.781700] [<ffffffff81d93049>] dump_stack+0xc1/0x128
[ 22.787029] [<ffffffff8142e281>] panic+0x1bc/0x3a8
[ 22.792012] [<ffffffff8142e0c5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 22.800213] [<ffffffff8112f8e0>] ? add_taint+0x40/0x50
[ 22.805551] [<ffffffff8153c9c0>] kasan_end_report+0x50/0x50
[ 22.811314] [<ffffffff8153ce67>] kasan_report+0x167/0x360
[ 22.816903] [<ffffffff8123db6f>] ? __lock_acquire+0x2eff/0x3640
[ 22.823013] [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20
[ 22.829730] [<ffffffff8123db6f>] __lock_acquire+0x2eff/0x3640
[ 22.835678] [<ffffffff8123b299>] ? __lock_acquire+0x629/0x3640
[ 22.841703] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.848690] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.855670] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.862646] [<ffffffff8123a05f>] ? mark_held_locks+0xaf/0x100
[ 22.868589] [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[ 22.874790] [<ffffffff8123ecee>] lock_acquire+0x12e/0x410
[ 22.880379] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 22.886401] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 22.892684] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 22.898708] [<ffffffff81223254>] remove_wait_queue+0x14/0x40
[ 22.904560] [<ffffffff8164fa8f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 22.911547] [<ffffffff8164fb0a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 22.918783] [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[ 22.924109] [<ffffffff816507d6>] ep_free+0x96/0x1b0
[ 22.929175] [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[ 22.934503] [<ffffffff81650934>] ep_eventpoll_release+0x44/0x60
[ 22.940611] [<ffffffff81573eec>] __fput+0x28c/0x6e0
[ 22.945678] [<ffffffff815743c5>] ____fput+0x15/0x20
[ 22.950761] [<ffffffff81194675>] task_work_run+0x115/0x190
[ 22.956438] [<ffffffff8113b157>] do_exit+0x7e7/0x2a40
[ 22.961682] [<ffffffff814cd7a0>] ? __pmd_alloc+0x410/0x410
[ 22.967364] [<ffffffff8113a970>] ? release_task+0x1240/0x1240
[ 22.973302] [<ffffffff810dd65c>] ? __do_page_fault+0x5ec/0xd40
[ 22.979331] [<ffffffff8122f8fa>] ? up_read+0x1a/0x40
[ 22.984492] [<ffffffff810dd42d>] ? __do_page_fault+0x3bd/0xd40
[ 22.990516] [<ffffffff81141868>] do_group_exit+0x108/0x320
[ 22.996194] [<ffffffff81141a80>] ? do_group_exit+0x320/0x320
[ 23.002044] [<ffffffff81141a9d>] SyS_exit_group+0x1d/0x20
[ 23.007646] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 23.013754] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 23.020392] [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83
[ 23.026627] Dumping ftrace buffer:
[ 23.030134] (ftrace buffer empty)
[ 23.033819] Kernel Offset: disabled
[ 23.037411] Rebooting in 86400 seconds..