[....] Starting enhanced syslogd: rsyslogd[ 10.521037] audit: type=1400 audit(1515222426.960:4): avc: denied { syslog } for pid=3171 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 '10.128.0.61' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 19.636294] ==================================================================
[ 19.637440] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 19.638323] Read of size 8 at addr ffff8801c94925b8 by task syzkaller760212/3320
[ 19.639326]
[ 19.639556] CPU: 1 PID: 3320 Comm: syzkaller760212 Not tainted 4.9.75-gbc7ff9b #15
[ 19.640578] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 19.641806] ffff8801ca037850 ffffffff81d93049 ffffea0007252480 ffff8801c94925b8
[ 19.642942] 0000000000000000 ffff8801c94925b8 ffff8801c94925b8 ffff8801ca037888
[ 19.644094] ffffffff8153ca53 ffff8801c94925b8 0000000000000008 0000000000000000
[ 19.645256] Call Trace:
[ 19.645612] [<ffffffff81d93049>] dump_stack+0xc1/0x128
[ 19.646336] [<ffffffff8153ca53>] print_address_description+0x73/0x280
[ 19.647210] [<ffffffff8153cf75>] kasan_report+0x275/0x360
[ 19.647951] [<ffffffff8123db6f>] ? __lock_acquire+0x2eff/0x3640
[ 19.648758] [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20
[ 19.649659] [<ffffffff8123db6f>] __lock_acquire+0x2eff/0x3640
[ 19.650498] [<ffffffff8123b299>] ? __lock_acquire+0x629/0x3640
[ 19.651348] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.652272] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 19.653199] [<ffffffff81233941>] ? __lock_is_held+0xa1/0xf0
[ 19.653965] [<ffffffff8123ecee>] lock_acquire+0x12e/0x410
[ 19.654709] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 19.655567] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 19.656400] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 19.662431] [<ffffffff81223254>] remove_wait_queue+0x14/0x40
[ 19.668281] [<ffffffff8164fa8f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 19.675258] [<ffffffff8164fb0a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 19.682497] [<ffffffff816504f1>] ep_remove+0x41/0x290
[ 19.687746] [<ffffffff81652495>] eventpoll_release_file+0xc5/0x140
[ 19.694125] [<ffffffff81574208>] __fput+0x5a8/0x6e0
[ 19.699190] [<ffffffff815743c5>] ____fput+0x15/0x20
[ 19.704256] [<ffffffff81194675>] task_work_run+0x115/0x190
[ 19.709946] [<ffffffff8113b157>] do_exit+0x7e7/0x2a40
[ 19.715191] [<ffffffff814cd7a0>] ? __pmd_alloc+0x410/0x410
[ 19.720866] [<ffffffff8113a970>] ? release_task+0x1240/0x1240
[ 19.726806] [<ffffffff810dd65c>] ? __do_page_fault+0x5ec/0xd40
[ 19.732836] [<ffffffff8122f8fa>] ? up_read+0x1a/0x40
[ 19.737993] [<ffffffff810dd42d>] ? __do_page_fault+0x3bd/0xd40
[ 19.744015] [<ffffffff81141868>] do_group_exit+0x108/0x320
[ 19.749690] [<ffffffff81141a80>] ? do_group_exit+0x320/0x320
[ 19.755545] [<ffffffff81141a9d>] SyS_exit_group+0x1d/0x20
[ 19.761133] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 19.767244] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 19.773880] [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83
[ 19.780073]
[ 19.781667] Allocated by task 3320:
[ 19.785264] save_stack_trace+0x16/0x20
[ 19.789203] save_stack+0x43/0xd0
[ 19.792626] kasan_kmalloc+0xad/0xe0
[ 19.796303] kmem_cache_alloc_trace+0xfb/0x2a0
[ 19.800850] binder_get_thread+0x15d/0x750
[ 19.805048] binder_poll+0x4a/0x210
[ 19.808642] SyS_epoll_ctl+0x11d7/0x2190
[ 19.812674] do_fast_syscall_32+0x2f7/0x890
[ 19.816972] entry_SYSENTER_compat+0x74/0x83
[ 19.821348]
[ 19.822946] Freed by task 3320:
[ 19.826203] save_stack_trace+0x16/0x20
[ 19.830152] save_stack+0x43/0xd0
[ 19.833581] kasan_slab_free+0x72/0xc0
[ 19.837434] kfree+0x103/0x300
[ 19.840590] binder_thread_dec_tmpref+0x1cc/0x240
[ 19.845396] binder_thread_release+0x27d/0x540
[ 19.849949] binder_ioctl+0x9c0/0x11b0
[ 19.853811] compat_SyS_ioctl+0x15f/0x2050
[ 19.858012] do_fast_syscall_32+0x2f7/0x890
[ 19.862299] entry_SYSENTER_compat+0x74/0x83
[ 19.866668]
[ 19.868262] The buggy address belongs to the object at ffff8801c9492500
[ 19.868262] which belongs to the cache kmalloc-512 of size 512
[ 19.880896] The buggy address is located 184 bytes inside of
[ 19.880896] 512-byte region [ffff8801c9492500, ffff8801c9492700)
[ 19.892744] The buggy address belongs to the page:
[ 19.897646] page:ffffea0007252480 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 19.907818] flags: 0x8000000000004080(slab|head)
[ 19.912537] page dumped because: kasan: bad access detected
[ 19.918209]
[ 19.919798] Memory state around the buggy address:
[ 19.924691] ffff8801c9492480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 19.932021] ffff8801c9492500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.939358] >ffff8801c9492580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.946682] ^
[ 19.951838] ffff8801c9492600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.959174] ffff8801c9492680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 19.966507] ==================================================================
[ 19.973836] Disabling lock debugging due to kernel taint
[ 19.979261] Kernel panic - not syncing: panic_on_warn set ...
[ 19.979261]
[ 19.986596] CPU: 1 PID: 3320 Comm: syzkaller760212 Tainted: G B 4.9.75-gbc7ff9b #15
[ 19.995486] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 20.004815] ffff8801ca0377a8 ffffffff81d93049 ffffffff84195be7 ffff8801ca037880
[ 20.012800] 0000000000000000 ffff8801c94925b8 ffff8801c94925b8 ffff8801ca037870
[ 20.020778] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5
[ 20.028752] Call Trace:
[ 20.031310] [<ffffffff81d93049>] dump_stack+0xc1/0x128
[ 20.036645] [<ffffffff8142e281>] panic+0x1bc/0x3a8
[ 20.041636] [<ffffffff8142e0c5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 20.049845] [<ffffffff8112f8e0>] ? add_taint+0x40/0x50
[ 20.055186] [<ffffffff8153c9c0>] kasan_end_report+0x50/0x50
[ 20.060951] [<ffffffff8153ce67>] kasan_report+0x167/0x360
[ 20.066540] [<ffffffff8123db6f>] ? __lock_acquire+0x2eff/0x3640
[ 20.072648] [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20
[ 20.079367] [<ffffffff8123db6f>] __lock_acquire+0x2eff/0x3640
[ 20.085305] [<ffffffff8123b299>] ? __lock_acquire+0x629/0x3640
[ 20.091326] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.098310] [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 20.105294] [<ffffffff81233941>] ? __lock_is_held+0xa1/0xf0
[ 20.111066] [<ffffffff8123ecee>] lock_acquire+0x12e/0x410
[ 20.116663] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 20.122691] [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[ 20.128979] [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[ 20.135011] [<ffffffff81223254>] remove_wait_queue+0x14/0x40
[ 20.140873] [<ffffffff8164fa8f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 20.147861] [<ffffffff8164fb0a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 20.155107] [<ffffffff816504f1>] ep_remove+0x41/0x290
[ 20.160359] [<ffffffff81652495>] eventpoll_release_file+0xc5/0x140
[ 20.166739] [<ffffffff81574208>] __fput+0x5a8/0x6e0
[ 20.171817] [<ffffffff815743c5>] ____fput+0x15/0x20
[ 20.176885] [<ffffffff81194675>] task_work_run+0x115/0x190
[ 20.182559] [<ffffffff8113b157>] do_exit+0x7e7/0x2a40
[ 20.187813] [<ffffffff814cd7a0>] ? __pmd_alloc+0x410/0x410
[ 20.193493] [<ffffffff8113a970>] ? release_task+0x1240/0x1240
[ 20.199436] [<ffffffff810dd65c>] ? __do_page_fault+0x5ec/0xd40
[ 20.205458] [<ffffffff8122f8fa>] ? up_read+0x1a/0x40
[ 20.210611] [<ffffffff810dd42d>] ? __do_page_fault+0x3bd/0xd40
[ 20.216643] [<ffffffff81141868>] do_group_exit+0x108/0x320
[ 20.222318] [<ffffffff81141a80>] ? do_group_exit+0x320/0x320
[ 20.228175] [<ffffffff81141a9d>] SyS_exit_group+0x1d/0x20
[ 20.233767] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890
[ 20.239880] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 20.246511] [<ffffffff838b2334>] entry_SYSENTER_compat+0x74/0x83
[ 20.253174] Dumping ftrace buffer:
[ 20.256678] (ftrace buffer empty)
[ 20.260351] Kernel Offset: disabled
[ 20.263941] Rebooting in 86400 seconds..