[....] Starting enhanced syslogd: rsyslogd[ 13.033328] audit: type=1400 audit(1517220750.791:4): 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 20.674386] ==================================================================
[ 20.681784] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 20.688433] Read of size 8 at addr ffff8801cc3dcd38 by task syzkaller656584/3326
[ 20.695935]
[ 20.697538] CPU: 0 PID: 3326 Comm: syzkaller656584 Not tainted 4.9.78-g68d447c #32
[ 20.705212] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 20.714538] ffff8801c8197870 ffffffff81d943a9 ffffea000730f700 ffff8801cc3dcd38
[ 20.722519] 0000000000000000 ffff8801cc3dcd38 ffff8801cc3dcd38 ffff8801c81978a8
[ 20.730650] ffffffff8153dc23 ffff8801cc3dcd38 0000000000000008 0000000000000000
[ 20.738623] Call Trace:
[ 20.741181] [<ffffffff81d943a9>] dump_stack+0xc1/0x128
[ 20.746525] [<ffffffff8153dc23>] print_address_description+0x73/0x280
[ 20.753172] [<ffffffff8153e145>] kasan_report+0x275/0x360
[ 20.758766] [<ffffffff8123ed1f>] ? __lock_acquire+0x2eff/0x3640
[ 20.764897] [<ffffffff8153e2a4>] __asan_report_load8_noabort+0x14/0x20
[ 20.771622] [<ffffffff8123ed1f>] __lock_acquire+0x2eff/0x3640
[ 20.777577] [<ffffffff8123c449>] ? __lock_acquire+0x629/0x3640
[ 20.783604] [<ffffffff8123be20>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.790590] [<ffffffff8123be20>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.797572] [<ffffffff8123be20>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.804554] [<ffffffff8123b20f>] ? mark_held_locks+0xaf/0x100
[ 20.810496] [<ffffffff838a93c3>] ? mutex_lock_nested+0x5e3/0x870
[ 20.816695] [<ffffffff8123fe9e>] lock_acquire+0x12e/0x410
[ 20.822291] [<ffffffff81224404>] ? remove_wait_queue+0x14/0x40
[ 20.828318] [<ffffffff838b2a8e>] _raw_spin_lock_irqsave+0x4e/0x70
[ 20.834605] [<ffffffff81224404>] ? remove_wait_queue+0x14/0x40
[ 20.840633] [<ffffffff81224404>] remove_wait_queue+0x14/0x40
[ 20.846493] [<ffffffff81650cbf>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 20.853475] [<ffffffff81650d3a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 20.860718] [<ffffffff81651b20>] ? ep_free+0x1b0/0x1b0
[ 20.866063] [<ffffffff81651a06>] ep_free+0x96/0x1b0
[ 20.871145] [<ffffffff81651b20>] ? ep_free+0x1b0/0x1b0
[ 20.876477] [<ffffffff81651b64>] ep_eventpoll_release+0x44/0x60
[ 20.882590] [<ffffffff815750bc>] __fput+0x28c/0x6e0
[ 20.887662] [<ffffffff81575595>] ____fput+0x15/0x20
[ 20.892749] [<ffffffff811957c5>] task_work_run+0x115/0x190
[ 20.898432] [<ffffffff8113c267>] do_exit+0x7e7/0x2a40
[ 20.903678] [<ffffffff814ce970>] ? __pmd_alloc+0x410/0x410
[ 20.909359] [<ffffffff8113ba80>] ? release_task+0x1240/0x1240
[ 20.915300] [<ffffffff810de66c>] ? __do_page_fault+0x5ec/0xd40
[ 20.921331] [<ffffffff81230aaa>] ? up_read+0x1a/0x40
[ 20.926495] [<ffffffff810de43d>] ? __do_page_fault+0x3bd/0xd40
[ 20.932524] [<ffffffff81142978>] do_group_exit+0x108/0x320
[ 20.938203] [<ffffffff81142b90>] ? do_group_exit+0x320/0x320
[ 20.944059] [<ffffffff81142bad>] SyS_exit_group+0x1d/0x20
[ 20.949652] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 20.955779] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 20.962420] [<ffffffff838b4534>] entry_SYSENTER_compat+0x74/0x83
[ 20.968622]
[ 20.970222] Allocated by task 3326:
[ 20.973819] save_stack_trace+0x16/0x20
[ 20.977765] save_stack+0x43/0xd0
[ 20.981186] kasan_kmalloc+0xad/0xe0
[ 20.984869] kmem_cache_alloc_trace+0xfb/0x2a0
[ 20.989420] binder_get_thread+0x15d/0x750
[ 20.993621] binder_poll+0x4a/0x210
[ 20.997227] SyS_epoll_ctl+0x11d7/0x2190
[ 21.001270] do_fast_syscall_32+0x2f7/0x890
[ 21.005574] entry_SYSENTER_compat+0x74/0x83
[ 21.009950]
[ 21.011545] Freed by task 3326:
[ 21.014794] save_stack_trace+0x16/0x20
[ 21.018739] save_stack+0x43/0xd0
[ 21.022175] kasan_slab_free+0x72/0xc0
[ 21.026031] kfree+0x103/0x300
[ 21.029204] binder_thread_dec_tmpref+0x1cc/0x240
[ 21.034058] binder_thread_release+0x27d/0x540
[ 21.038629] binder_ioctl+0x9c0/0x11b0
[ 21.042492] compat_SyS_ioctl+0x15f/0x2050
[ 21.046697] do_fast_syscall_32+0x2f7/0x890
[ 21.050987] entry_SYSENTER_compat+0x74/0x83
[ 21.055361]
[ 21.056958] The buggy address belongs to the object at ffff8801cc3dcc80
[ 21.056958] which belongs to the cache kmalloc-512 of size 512
[ 21.069597] The buggy address is located 184 bytes inside of
[ 21.069597] 512-byte region [ffff8801cc3dcc80, ffff8801cc3dce80)
[ 21.081439] The buggy address belongs to the page:
[ 21.086339] page:ffffea000730f700 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 21.096511] flags: 0x8000000000004080(slab|head)
[ 21.101233] page dumped because: kasan: bad access detected
[ 21.106908]
[ 21.108503] Memory state around the buggy address:
[ 21.113401] ffff8801cc3dcc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 21.120726] ffff8801cc3dcc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.128053] >ffff8801cc3dcd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.135380] ^
[ 21.140550] ffff8801cc3dcd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.147885] ffff8801cc3dce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.155214] ==================================================================
[ 21.162537] Disabling lock debugging due to kernel taint
[ 21.167953] Kernel panic - not syncing: panic_on_warn set ...
[ 21.167953]
[ 21.175298] CPU: 0 PID: 3326 Comm: syzkaller656584 Tainted: G B 4.9.78-g68d447c #32
[ 21.184190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 21.193520] ffff8801c81977c8 ffffffff81d943a9 ffffffff841971bf ffff8801c81978a0
[ 21.201527] 0000000000000000 ffff8801cc3dcd38 ffff8801cc3dcd38 ffff8801c8197890
[ 21.209496] ffffffff8142f451 0000000041b58ab3 ffffffff8418ac30 ffffffff8142f295
[ 21.217473] Call Trace:
[ 21.220041] [<ffffffff81d943a9>] dump_stack+0xc1/0x128
[ 21.225387] [<ffffffff8142f451>] panic+0x1bc/0x3a8
[ 21.230374] [<ffffffff8142f295>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 21.238573] [<ffffffff811309f0>] ? add_taint+0x40/0x50
[ 21.243906] [<ffffffff8153db90>] kasan_end_report+0x50/0x50
[ 21.249673] [<ffffffff8153e037>] kasan_report+0x167/0x360
[ 21.255270] [<ffffffff8123ed1f>] ? __lock_acquire+0x2eff/0x3640
[ 21.261388] [<ffffffff8153e2a4>] __asan_report_load8_noabort+0x14/0x20
[ 21.268108] [<ffffffff8123ed1f>] __lock_acquire+0x2eff/0x3640
[ 21.274046] [<ffffffff8123c449>] ? __lock_acquire+0x629/0x3640
[ 21.280072] [<ffffffff8123be20>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 21.287051] [<ffffffff8123be20>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 21.294034] [<ffffffff8123be20>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 21.301016] [<ffffffff8123b20f>] ? mark_held_locks+0xaf/0x100
[ 21.306960] [<ffffffff838a93c3>] ? mutex_lock_nested+0x5e3/0x870
[ 21.313164] [<ffffffff8123fe9e>] lock_acquire+0x12e/0x410
[ 21.318763] [<ffffffff81224404>] ? remove_wait_queue+0x14/0x40
[ 21.324790] [<ffffffff838b2a8e>] _raw_spin_lock_irqsave+0x4e/0x70
[ 21.331077] [<ffffffff81224404>] ? remove_wait_queue+0x14/0x40
[ 21.337103] [<ffffffff81224404>] remove_wait_queue+0x14/0x40
[ 21.342962] [<ffffffff81650cbf>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 21.349944] [<ffffffff81650d3a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 21.357199] [<ffffffff81651b20>] ? ep_free+0x1b0/0x1b0
[ 21.362619] [<ffffffff81651a06>] ep_free+0x96/0x1b0
[ 21.367693] [<ffffffff81651b20>] ? ep_free+0x1b0/0x1b0
[ 21.373025] [<ffffffff81651b64>] ep_eventpoll_release+0x44/0x60
[ 21.379136] [<ffffffff815750bc>] __fput+0x28c/0x6e0
[ 21.384209] [<ffffffff81575595>] ____fput+0x15/0x20
[ 21.389289] [<ffffffff811957c5>] task_work_run+0x115/0x190
[ 21.394968] [<ffffffff8113c267>] do_exit+0x7e7/0x2a40
[ 21.400212] [<ffffffff814ce970>] ? __pmd_alloc+0x410/0x410
[ 21.405896] [<ffffffff8113ba80>] ? release_task+0x1240/0x1240
[ 21.411839] [<ffffffff810de66c>] ? __do_page_fault+0x5ec/0xd40
[ 21.417890] [<ffffffff81230aaa>] ? up_read+0x1a/0x40
[ 21.423060] [<ffffffff810de43d>] ? __do_page_fault+0x3bd/0xd40
[ 21.429090] [<ffffffff81142978>] do_group_exit+0x108/0x320
[ 21.434770] [<ffffffff81142b90>] ? do_group_exit+0x320/0x320
[ 21.440625] [<ffffffff81142bad>] SyS_exit_group+0x1d/0x20
[ 21.446221] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 21.452344] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 21.458984] [<ffffffff838b4534>] entry_SYSENTER_compat+0x74/0x83
[ 21.465623] Dumping ftrace buffer:
[ 21.469676] (ftrace buffer empty)
[ 21.473356] Kernel Offset: disabled
[ 21.476948] Rebooting in 86400 seconds..