[....] Starting enhanced syslogd: rsyslogd[ 13.259079] audit: type=1400 audit(1517189707.951:5): avc: denied { syslog } for pid=3537 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[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.951754] audit: type=1400 audit(1517189713.644:6): avc: denied { map } for pid=3678 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.194' (ECDSA) to the list of known hosts. executing program [ 25.270393] audit: type=1400 audit(1517189719.963:7): avc: denied { map } for pid=3692 comm="syzkaller664097" path="/root/syzkaller664097325" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 25.276262] ================================================================== [ 25.276277] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 25.276282] Read of size 8 at addr ffff8801d96c9d30 by task syzkaller664097/3692 [ 25.276284] [ 25.276291] CPU: 1 PID: 3692 Comm: syzkaller664097 Not tainted 4.15.0-rc9+ #194 [ 25.276295] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.276297] Call Trace: [ 25.276307] dump_stack+0x194/0x257 [ 25.276314] ? arch_local_irq_restore+0x53/0x53 [ 25.276322] ? show_regs_print_info+0x18/0x18 [ 25.276328] ? print_irqtrace_events+0x270/0x270 [ 25.276334] ? __lock_acquire+0x664/0x3e00 [ 25.276340] ? __lock_acquire+0x3d4d/0x3e00 [ 25.276355] print_address_description+0x73/0x250 [ 25.276361] ? __lock_acquire+0x3d4d/0x3e00 [ 25.276367] kasan_report+0x25b/0x340 [ 25.276375] __asan_report_load8_noabort+0x14/0x20 [ 25.276381] __lock_acquire+0x3d4d/0x3e00 [ 25.276387] ? __lock_acquire+0x664/0x3e00 [ 25.276393] ? lock_downgrade+0x980/0x980 [ 25.276398] ? lock_downgrade+0x980/0x980 [ 25.276405] ? print_irqtrace_events+0x270/0x270 [ 25.276413] ? remove_wait_queue+0x81/0x350 [ 25.276422] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.276429] ? __lock_acquire+0x664/0x3e00 [ 25.276434] ? check_noncircular+0x20/0x20 [ 25.276446] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.276453] ? lock_acquire+0x1d5/0x580 [ 25.276459] ? lock_acquire+0x1d5/0x580 [ 25.276465] ? ep_free+0xf4/0x320 [ 25.276474] ? lock_release+0xa40/0xa40 [ 25.276481] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.276486] ? print_irqtrace_events+0x270/0x270 [ 25.276492] ? print_irqtrace_events+0x270/0x270 [ 25.276500] ? rcu_note_context_switch+0x710/0x710 [ 25.276508] ? __might_sleep+0x95/0x190 [ 25.276514] ? ep_free+0xf4/0x320 [ 25.276527] ? __mutex_lock+0x16f/0x1a80 [ 25.276532] ? ep_free+0xf4/0x320 [ 25.276539] ? print_irqtrace_events+0x270/0x270 [ 25.276544] ? ep_free+0xf4/0x320 [ 25.276553] lock_acquire+0x1d5/0x580 [ 25.276558] ? lock_acquire+0x1d5/0x580 [ 25.276564] ? remove_wait_queue+0x81/0x350 [ 25.276572] ? lock_release+0xa40/0xa40 [ 25.276581] ? lock_acquire+0x1d5/0x580 [ 25.276587] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.276592] ? lock_acquire+0x1d5/0x580 [ 25.276599] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.276607] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.276612] ? remove_wait_queue+0x81/0x350 [ 25.276618] remove_wait_queue+0x81/0x350 [ 25.276627] ? depot_save_stack+0x3b5/0x490 [ 25.276634] ? add_wait_queue+0x290/0x290 [ 25.276640] ? rcutorture_record_progress+0x10/0x10 [ 25.276646] ? lock_release+0xa40/0xa40 [ 25.276655] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.276663] ? __kernel_text_address+0xd/0x40 [ 25.276672] ? clear_tfile_check_list+0x370/0x370 [ 25.276679] ? check_noncircular+0x20/0x20 [ 25.276689] ? locks_remove_file+0x3fa/0x5a0 [ 25.276699] ep_free+0x13f/0x320 [ 25.276705] ? ep_remove+0x800/0x800 [ 25.276711] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.276718] ? ep_free+0x320/0x320 [ 25.276725] ep_eventpoll_release+0x44/0x60 [ 25.276733] __fput+0x327/0x7e0 [ 25.276741] ? fput+0x140/0x140 [ 25.276748] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.276756] ____fput+0x15/0x20 [ 25.276763] task_work_run+0x199/0x270 [ 25.276770] ? task_work_cancel+0x210/0x210 [ 25.276776] ? _raw_spin_unlock+0x22/0x30 [ 25.276782] ? switch_task_namespaces+0x87/0xc0 [ 25.276791] do_exit+0x9bb/0x1ad0 [ 25.276798] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.276806] ? mm_update_next_owner+0x930/0x930 [ 25.276816] ? do_raw_spin_trylock+0x190/0x190 [ 25.276823] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.276829] ? check_noncircular+0x20/0x20 [ 25.276836] ? _raw_spin_unlock+0x22/0x30 [ 25.276842] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.276849] ? check_noncircular+0x20/0x20 [ 25.276854] ? __pmd_alloc+0x4e0/0x4e0 [ 25.276860] ? lock_downgrade+0x980/0x980 [ 25.276868] ? find_held_lock+0x35/0x1d0 [ 25.276876] ? handle_mm_fault+0x248/0x8d0 [ 25.276883] ? find_held_lock+0x35/0x1d0 [ 25.276893] ? __do_page_fault+0x5f7/0xc90 [ 25.276899] ? lock_downgrade+0x980/0x980 [ 25.276908] ? handle_mm_fault+0x410/0x8d0 [ 25.276914] ? down_read_trylock+0xdb/0x170 [ 25.276919] ? __do_page_fault+0x32d/0xc90 [ 25.276926] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.276932] ? vmacache_find+0x5f/0x280 [ 25.276940] do_group_exit+0x149/0x400 [ 25.276947] ? __do_page_fault+0x3d6/0xc90 [ 25.276952] ? SyS_exit+0x30/0x30 [ 25.276961] ? do_fast_syscall_32+0x156/0xf9d [ 25.276967] ? do_group_exit+0x400/0x400 [ 25.276974] SyS_exit_group+0x1d/0x20 [ 25.276980] do_fast_syscall_32+0x3ee/0xf9d [ 25.276989] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.276994] ? kasan_check_read+0x11/0x20 [ 25.277006] ? syscall_return_slowpath+0x550/0x550 [ 25.277013] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.277020] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.277026] ? SyS_read+0x184/0x220 [ 25.277031] ? retint_user+0x18/0x18 [ 25.277040] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.277049] entry_SYSENTER_compat+0x54/0x63 [ 25.277054] RIP: 0023:0xf7f45c79 [ 25.277057] RSP: 002b:00000000ffc8d90c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 25.277079] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.277083] RDX: 0000000000000000 RSI: 00000000080d9ab8 RDI: 00000000080f02a0 [ 25.277086] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.277089] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.277092] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.277100] [ 25.277103] Allocated by task 3692: [ 25.277109] save_stack+0x43/0xd0 [ 25.277114] kasan_kmalloc+0xad/0xe0 [ 25.277118] kmem_cache_alloc_trace+0x136/0x750 [ 25.277124] binder_get_thread+0x1cf/0x870 [ 25.277128] binder_poll+0x8c/0x390 [ 25.277133] ep_item_poll.isra.10+0xec/0x320 [ 25.277138] ep_insert+0x6a3/0x1b10 [ 25.277142] SyS_epoll_ctl+0x12e4/0x1ab0 [ 25.277148] do_fast_syscall_32+0x3ee/0xf9d [ 25.277153] entry_SYSENTER_compat+0x54/0x63 [ 25.277154] [ 25.277156] Freed by task 3692: [ 25.277161] save_stack+0x43/0xd0 [ 25.277165] kasan_slab_free+0x71/0xc0 [ 25.277169] kfree+0xd6/0x260 [ 25.277177] binder_thread_dec_tmpref+0x27f/0x310 [ 25.277182] binder_thread_release+0x27d/0x540 [ 25.277186] binder_ioctl+0xc02/0x1417 [ 25.277191] compat_SyS_ioctl+0x151/0x2a30 [ 25.277196] do_fast_syscall_32+0x3ee/0xf9d [ 25.277202] entry_SYSENTER_compat+0x54/0x63 [ 25.277203] [ 25.277207] The buggy address belongs to the object at ffff8801d96c9c80 [ 25.277207] which belongs to the cache kmalloc-512 of size 512 [ 25.277212] The buggy address is located 176 bytes inside of [ 25.277212] 512-byte region [ffff8801d96c9c80, ffff8801d96c9e80) [ 25.277214] The buggy address belongs to the page: [ 25.277219] page:ffffea000765b240 count:1 mapcount:0 mapping:ffff8801d96c9000 index:0x0 [ 25.277224] flags: 0x2fffc0000000100(slab) [ 25.277232] raw: 02fffc0000000100 ffff8801d96c9000 0000000000000000 0000000100000006 [ 25.277239] raw: ffffea0006ede7e0 ffffea00076091e0 ffff8801dac00940 0000000000000000 [ 25.277241] page dumped because: kasan: bad access detected [ 25.277242] [ 25.277244] Memory state around the buggy address: [ 25.277248] ffff8801d96c9c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.277253] ffff8801d96c9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.277257] >ffff8801d96c9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.277259] ^ [ 25.277263] ffff8801d96c9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.277268] ffff8801d96c9e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.277269] ================================================================== [ 25.277271] Disabling lock debugging due to kernel taint [ 25.277274] Kernel panic - not syncing: panic_on_warn set ... [ 25.277274] [ 25.277280] CPU: 1 PID: 3692 Comm: syzkaller664097 Tainted: G B 4.15.0-rc9+ #194 [ 25.277283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.277285] Call Trace: [ 25.277291] dump_stack+0x194/0x257 [ 25.277298] ? arch_local_irq_restore+0x53/0x53 [ 25.277303] ? kasan_end_report+0x32/0x50 [ 25.277309] ? lock_downgrade+0x980/0x980 [ 25.277316] ? vsnprintf+0x1ed/0x1900 [ 25.277322] ? __lock_acquire+0x3cd0/0x3e00 [ 25.277327] panic+0x1e4/0x41c [ 25.277333] ? refcount_error_report+0x214/0x214 [ 25.277340] ? add_taint+0x40/0x50 [ 25.277350] ? add_taint+0x1c/0x50 [ 25.277356] ? __lock_acquire+0x3d4d/0x3e00 [ 25.277362] kasan_end_report+0x50/0x50 [ 25.277368] kasan_report+0x144/0x340 [ 25.277376] __asan_report_load8_noabort+0x14/0x20 [ 25.277381] __lock_acquire+0x3d4d/0x3e00 [ 25.277387] ? __lock_acquire+0x664/0x3e00 [ 25.277393] ? lock_downgrade+0x980/0x980 [ 25.277398] ? lock_downgrade+0x980/0x980 [ 25.277405] ? print_irqtrace_events+0x270/0x270 [ 25.277410] ? remove_wait_queue+0x81/0x350 [ 25.277419] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.277425] ? __lock_acquire+0x664/0x3e00 [ 25.277431] ? check_noncircular+0x20/0x20 [ 25.277443] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.277450] ? lock_acquire+0x1d5/0x580 [ 25.277455] ? lock_acquire+0x1d5/0x580 [ 25.277460] ? ep_free+0xf4/0x320 [ 25.277468] ? lock_release+0xa40/0xa40 [ 25.277474] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.277480] ? print_irqtrace_events+0x270/0x270 [ 25.277485] ? print_irqtrace_events+0x270/0x270 [ 25.277492] ? rcu_note_context_switch+0x710/0x710 [ 25.277499] ? __might_sleep+0x95/0x190 [ 25.277505] ? ep_free+0xf4/0x320 [ 25.277510] ? __mutex_lock+0x16f/0x1a80 [ 25.277515] ? ep_free+0xf4/0x320 [ 25.277522] ? print_irqtrace_events+0x270/0x270 [ 25.277527] ? ep_free+0xf4/0x320 [ 25.277535] lock_acquire+0x1d5/0x580 [ 25.277540] ? lock_acquire+0x1d5/0x580 [ 25.277546] ? remove_wait_queue+0x81/0x350 [ 25.277554] ? lock_release+0xa40/0xa40 [ 25.277563] ? lock_acquire+0x1d5/0x580 [ 25.277569] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.277573] ? lock_acquire+0x1d5/0x580 [ 25.277580] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.277587] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.277593] ? remove_wait_queue+0x81/0x350 [ 25.277599] remove_wait_queue+0x81/0x350 [ 25.277605] ? depot_save_stack+0x3b5/0x490 [ 25.277612] ? add_wait_queue+0x290/0x290 [ 25.277618] ? rcutorture_record_progress+0x10/0x10 [ 25.277623] ? lock_release+0xa40/0xa40 [ 25.277632] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.277639] ? __kernel_text_address+0xd/0x40 [ 25.277647] ? clear_tfile_check_list+0x370/0x370 [ 25.277654] ? check_noncircular+0x20/0x20 [ 25.277662] ? locks_remove_file+0x3fa/0x5a0 [ 25.277671] ep_free+0x13f/0x320 [ 25.277677] ? ep_remove+0x800/0x800 [ 25.277682] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.277690] ? ep_free+0x320/0x320 [ 25.277696] ep_eventpoll_release+0x44/0x60 [ 25.277702] __fput+0x327/0x7e0 [ 25.277710] ? fput+0x140/0x140 [ 25.277717] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.277725] ____fput+0x15/0x20 [ 25.277731] task_work_run+0x199/0x270 [ 25.277739] ? task_work_cancel+0x210/0x210 [ 25.277745] ? _raw_spin_unlock+0x22/0x30 [ 25.277751] ? switch_task_namespaces+0x87/0xc0 [ 25.277758] do_exit+0x9bb/0x1ad0 [ 25.277764] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.277771] ? mm_update_next_owner+0x930/0x930 [ 25.277781] ? do_raw_spin_trylock+0x190/0x190 [ 25.277788] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.277793] ? check_noncircular+0x20/0x20 [ 25.277800] ? _raw_spin_unlock+0x22/0x30 [ 25.277806] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.277814] ? check_noncircular+0x20/0x20 [ 25.277819] ? __pmd_alloc+0x4e0/0x4e0 [ 25.277824] ? lock_downgrade+0x980/0x980 [ 25.277832] ? find_held_lock+0x35/0x1d0 [ 25.277840] ? handle_mm_fault+0x248/0x8d0 [ 25.277847] ? find_held_lock+0x35/0x1d0 [ 25.277856] ? __do_page_fault+0x5f7/0xc90 [ 25.277862] ? lock_downgrade+0x980/0x980 [ 25.277871] ? handle_mm_fault+0x410/0x8d0 [ 25.277876] ? down_read_trylock+0xdb/0x170 [ 25.277881] ? __do_page_fault+0x32d/0xc90 [ 25.277888] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.277893] ? vmacache_find+0x5f/0x280 [ 25.277902] do_group_exit+0x149/0x400 [ 25.277908] ? __do_page_fault+0x3d6/0xc90 [ 25.277913] ? SyS_exit+0x30/0x30 [ 25.277921] ? do_fast_syscall_32+0x156/0xf9d [ 25.277927] ? do_group_exit+0x400/0x400 [ 25.277933] SyS_exit_group+0x1d/0x20 [ 25.277939] do_fast_syscall_32+0x3ee/0xf9d [ 25.277948] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.277954] ? kasan_check_read+0x11/0x20 [ 25.277961] ? syscall_return_slowpath+0x550/0x550 [ 25.277967] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.277974] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.277979] ? SyS_read+0x184/0x220 [ 25.277985] ? retint_user+0x18/0x18 [ 25.277993] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.278002] entry_SYSENTER_compat+0x54/0x63 [ 25.278005] RIP: 0023:0xf7f45c79 [ 25.278008] RSP: 002b:00000000ffc8d90c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 25.278014] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.278017] RDX: 0000000000000000 RSI: 00000000080d9ab8 RDI: 00000000080f02a0 [ 25.278020] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.278023] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.278026] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.296773] Dumping ftrace buffer: [ 25.296776] (ftrace buffer empty) [ 25.296779] Kernel Offset: disabled [ 26.579388] Rebooting in 86400 seconds..