[....] Starting enhanced syslogd: rsyslogd[ 11.907142] audit: type=1400 audit(1515625689.119:5): avc: denied { syslog } for pid=3342 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: [ 18.644051] audit: type=1400 audit(1515625695.856:6): avc: denied { map } for pid=3482 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 '10.128.0.57' (ECDSA) to the list of known hosts. executing program [ 38.404598] audit: type=1400 audit(1515625715.617:7): avc: denied { map } for pid=3499 comm="syzkaller832330" path="/root/syzkaller832330352" 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 [ 38.409391] ================================================================== [ 38.409404] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 38.409408] Read of size 8 at addr ffff8801c7fcd5b0 by task syzkaller832330/3499 [ 38.409409] [ 38.409414] CPU: 1 PID: 3499 Comm: syzkaller832330 Not tainted 4.15.0-rc7+ #167 [ 38.409417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.409419] Call Trace: [ 38.409427] dump_stack+0x194/0x257 [ 38.409432] ? arch_local_irq_restore+0x53/0x53 [ 38.409438] ? show_regs_print_info+0x18/0x18 [ 38.409442] ? print_irqtrace_events+0x270/0x270 [ 38.409446] ? __lock_acquire+0x664/0x3e00 [ 38.409450] ? __lock_acquire+0x3d4d/0x3e00 [ 38.409457] print_address_description+0x73/0x250 [ 38.409460] ? __lock_acquire+0x3d4d/0x3e00 [ 38.409464] kasan_report+0x25b/0x340 [ 38.409470] __asan_report_load8_noabort+0x14/0x20 [ 38.409473] __lock_acquire+0x3d4d/0x3e00 [ 38.409477] ? __lock_acquire+0x664/0x3e00 [ 38.409480] ? lock_downgrade+0x980/0x980 [ 38.409484] ? lock_downgrade+0x980/0x980 [ 38.409488] ? print_irqtrace_events+0x270/0x270 [ 38.409494] ? remove_wait_queue+0x81/0x350 [ 38.409499] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.409503] ? __lock_acquire+0x664/0x3e00 [ 38.409507] ? check_noncircular+0x20/0x20 [ 38.409514] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.409518] ? lock_acquire+0x1d5/0x580 [ 38.409521] ? lock_acquire+0x1d5/0x580 [ 38.409527] ? ep_free+0xf4/0x320 [ 38.409532] ? lock_release+0xa40/0xa40 [ 38.409537] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.409541] ? print_irqtrace_events+0x270/0x270 [ 38.409544] ? print_irqtrace_events+0x270/0x270 [ 38.409552] ? rcu_note_context_switch+0x710/0x710 [ 38.409556] ? __might_sleep+0x95/0x190 [ 38.409560] ? ep_free+0xf4/0x320 [ 38.409565] ? __mutex_lock+0x16f/0x1a80 [ 38.409568] ? ep_free+0xf4/0x320 [ 38.409572] ? print_irqtrace_events+0x270/0x270 [ 38.409575] ? ep_free+0xf4/0x320 [ 38.409580] lock_acquire+0x1d5/0x580 [ 38.409584] ? lock_acquire+0x1d5/0x580 [ 38.409587] ? remove_wait_queue+0x81/0x350 [ 38.409592] ? lock_release+0xa40/0xa40 [ 38.409597] ? lock_acquire+0x1d5/0x580 [ 38.409601] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.409604] ? lock_acquire+0x1d5/0x580 [ 38.409608] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 38.409614] _raw_spin_lock_irqsave+0x96/0xc0 [ 38.409617] ? remove_wait_queue+0x81/0x350 [ 38.409621] remove_wait_queue+0x81/0x350 [ 38.409627] ? depot_save_stack+0x3b5/0x490 [ 38.409631] ? add_wait_queue+0x290/0x290 [ 38.409635] ? rcutorture_record_progress+0x10/0x10 [ 38.409639] ? lock_release+0xa40/0xa40 [ 38.409644] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 38.409649] ? __kernel_text_address+0xd/0x40 [ 38.409654] ? clear_tfile_check_list+0x370/0x370 [ 38.409659] ? check_noncircular+0x20/0x20 [ 38.409664] ? locks_remove_file+0x3fa/0x5a0 [ 38.409669] ep_free+0x13f/0x320 [ 38.409673] ? ep_remove+0x800/0x800 [ 38.409677] ? fsnotify_first_mark+0x2b0/0x2b0 [ 38.409681] ? ep_free+0x320/0x320 [ 38.409685] ep_eventpoll_release+0x44/0x60 [ 38.409690] __fput+0x327/0x7e0 [ 38.409695] ? fput+0x140/0x140 [ 38.409699] ? _raw_spin_unlock_irq+0x27/0x70 [ 38.409709] ____fput+0x15/0x20 [ 38.409713] task_work_run+0x199/0x270 [ 38.409717] ? task_work_cancel+0x210/0x210 [ 38.409722] ? _raw_spin_unlock+0x22/0x30 [ 38.409726] ? switch_task_namespaces+0x87/0xc0 [ 38.409734] do_exit+0x9bb/0x1ad0 [ 38.409740] ? __handle_mm_fault+0x2330/0x3ce0 [ 38.409745] ? mm_update_next_owner+0x930/0x930 [ 38.409752] ? do_raw_spin_trylock+0x190/0x190 [ 38.409756] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.409760] ? check_noncircular+0x20/0x20 [ 38.409764] ? _raw_spin_unlock+0x22/0x30 [ 38.409767] ? __handle_mm_fault+0x80e/0x3ce0 [ 38.409772] ? check_noncircular+0x20/0x20 [ 38.409775] ? __pmd_alloc+0x4e0/0x4e0 [ 38.409778] ? lock_downgrade+0x980/0x980 [ 38.409783] ? find_held_lock+0x35/0x1d0 [ 38.409788] ? handle_mm_fault+0x248/0x8d0 [ 38.409792] ? find_held_lock+0x35/0x1d0 [ 38.409800] ? __do_page_fault+0x5f7/0xc90 [ 38.409804] ? lock_downgrade+0x980/0x980 [ 38.409809] ? handle_mm_fault+0x410/0x8d0 [ 38.409812] ? down_read_trylock+0xdb/0x170 [ 38.409815] ? __do_page_fault+0x32d/0xc90 [ 38.409819] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 38.409824] ? vmacache_find+0x5f/0x280 [ 38.409829] do_group_exit+0x149/0x400 [ 38.409833] ? __do_page_fault+0x3d6/0xc90 [ 38.409836] ? SyS_exit+0x30/0x30 [ 38.409843] ? do_fast_syscall_32+0x156/0xf9d [ 38.409847] ? do_group_exit+0x400/0x400 [ 38.409851] SyS_exit_group+0x1d/0x20 [ 38.409854] do_fast_syscall_32+0x3ee/0xf9d [ 38.409859] ? do_int80_syscall_32+0x9d0/0x9d0 [ 38.409863] ? kasan_check_read+0x11/0x20 [ 38.409867] ? syscall_return_slowpath+0x550/0x550 [ 38.409873] ? SyS_rt_sigaction+0x94/0x1b0 [ 38.409877] ? SyS_sigprocmask+0x4b0/0x4b0 [ 38.409881] ? SyS_read+0x184/0x220 [ 38.409885] ? retint_user+0x18/0x18 [ 38.409890] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.409895] entry_SYSENTER_compat+0x54/0x63 [ 38.409899] RIP: 0023:0xf7f41c79 [ 38.409901] RSP: 002b:00000000ffa195cc EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 38.409905] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 38.409907] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 38.409909] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 38.409911] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 38.409913] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 38.409917] [ 38.409919] Allocated by task 3499: [ 38.409923] save_stack+0x43/0xd0 [ 38.409926] kasan_kmalloc+0xad/0xe0 [ 38.409929] kmem_cache_alloc_trace+0x136/0x750 [ 38.409933] binder_get_thread+0x1cf/0x870 [ 38.409936] binder_poll+0x8c/0x390 [ 38.409939] ep_item_poll.isra.10+0xec/0x320 [ 38.409942] ep_insert+0x6a3/0x1b10 [ 38.409945] SyS_epoll_ctl+0x12e4/0x1ab0 [ 38.409948] do_fast_syscall_32+0x3ee/0xf9d [ 38.409951] entry_SYSENTER_compat+0x54/0x63 [ 38.409951] [ 38.409953] Freed by task 3499: [ 38.409955] save_stack+0x43/0xd0 [ 38.409958] kasan_slab_free+0x71/0xc0 [ 38.409961] kfree+0xd6/0x260 [ 38.409964] binder_thread_dec_tmpref+0x27f/0x310 [ 38.409966] binder_thread_release+0x27d/0x540 [ 38.409969] binder_ioctl+0xc02/0x1417 [ 38.409972] compat_SyS_ioctl+0x151/0x2a30 [ 38.409975] do_fast_syscall_32+0x3ee/0xf9d [ 38.409978] entry_SYSENTER_compat+0x54/0x63 [ 38.409978] [ 38.409981] The buggy address belongs to the object at ffff8801c7fcd500 [ 38.409981] which belongs to the cache kmalloc-512 of size 512 [ 38.409984] The buggy address is located 176 bytes inside of [ 38.409984] 512-byte region [ffff8801c7fcd500, ffff8801c7fcd700) [ 38.409985] The buggy address belongs to the page: [ 38.409989] page:ffffea00071ff340 count:1 mapcount:0 mapping:ffff8801c7fcd000 index:0x0 [ 38.409993] flags: 0x2fffc0000000100(slab) [ 38.409999] raw: 02fffc0000000100 ffff8801c7fcd000 0000000000000000 0000000100000006 [ 38.410006] raw: ffffea00071f7ea0 ffffea00071e0c20 ffff8801dac00940 0000000000000000 [ 38.410008] page dumped because: kasan: bad access detected [ 38.410008] [ 38.410009] Memory state around the buggy address: [ 38.410013] ffff8801c7fcd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.410015] ffff8801c7fcd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.410018] >ffff8801c7fcd580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.410019] ^ [ 38.410021] ffff8801c7fcd600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.410024] ffff8801c7fcd680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.410025] ================================================================== [ 38.410026] Disabling lock debugging due to kernel taint [ 38.410029] Kernel panic - not syncing: panic_on_warn set ... [ 38.410029] [ 38.410032] CPU: 1 PID: 3499 Comm: syzkaller832330 Tainted: G B 4.15.0-rc7+ #167 [ 38.410034] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.410035] Call Trace: [ 38.410040] dump_stack+0x194/0x257 [ 38.410044] ? arch_local_irq_restore+0x53/0x53 [ 38.410047] ? kasan_end_report+0x32/0x50 [ 38.410051] ? lock_downgrade+0x980/0x980 [ 38.410056] ? vsnprintf+0x1ed/0x1900 [ 38.410060] ? __lock_acquire+0x3cb0/0x3e00 [ 38.410064] panic+0x1e4/0x41c [ 38.410068] ? refcount_error_report+0x214/0x214 [ 38.410072] ? add_taint+0x40/0x50 [ 38.410075] ? add_taint+0x1c/0x50 [ 38.410079] ? __lock_acquire+0x3d4d/0x3e00 [ 38.410083] kasan_end_report+0x50/0x50 [ 38.410086] kasan_report+0x144/0x340 [ 38.410091] __asan_report_load8_noabort+0x14/0x20 [ 38.410094] __lock_acquire+0x3d4d/0x3e00 [ 38.410098] ? __lock_acquire+0x664/0x3e00 [ 38.410101] ? lock_downgrade+0x980/0x980 [ 38.410104] ? lock_downgrade+0x980/0x980 [ 38.410108] ? print_irqtrace_events+0x270/0x270 [ 38.410112] ? remove_wait_queue+0x81/0x350 [ 38.410117] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.410121] ? __lock_acquire+0x664/0x3e00 [ 38.410124] ? check_noncircular+0x20/0x20 [ 38.410131] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.410135] ? lock_acquire+0x1d5/0x580 [ 38.410138] ? lock_acquire+0x1d5/0x580 [ 38.410142] ? ep_free+0xf4/0x320 [ 38.410147] ? lock_release+0xa40/0xa40 [ 38.410150] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.410154] ? print_irqtrace_events+0x270/0x270 [ 38.410157] ? print_irqtrace_events+0x270/0x270 [ 38.410161] ? rcu_note_context_switch+0x710/0x710 [ 38.410165] ? __might_sleep+0x95/0x190 [ 38.410169] ? ep_free+0xf4/0x320 [ 38.410172] ? __mutex_lock+0x16f/0x1a80 [ 38.410175] ? ep_free+0xf4/0x320 [ 38.410179] ? print_irqtrace_events+0x270/0x270 [ 38.410182] ? ep_free+0xf4/0x320 [ 38.410187] lock_acquire+0x1d5/0x580 [ 38.410190] ? lock_acquire+0x1d5/0x580 [ 38.410194] ? remove_wait_queue+0x81/0x350 [ 38.410199] ? lock_release+0xa40/0xa40 [ 38.410204] ? lock_acquire+0x1d5/0x580 [ 38.410207] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.410210] ? lock_acquire+0x1d5/0x580 [ 38.410214] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 38.410219] _raw_spin_lock_irqsave+0x96/0xc0 [ 38.410222] ? remove_wait_queue+0x81/0x350 [ 38.410226] remove_wait_queue+0x81/0x350 [ 38.410230] ? depot_save_stack+0x3b5/0x490 [ 38.410234] ? add_wait_queue+0x290/0x290 [ 38.410237] ? rcutorture_record_progress+0x10/0x10 [ 38.410241] ? lock_release+0xa40/0xa40 [ 38.410246] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 38.410250] ? __kernel_text_address+0xd/0x40 [ 38.410255] ? clear_tfile_check_list+0x370/0x370 [ 38.410259] ? check_noncircular+0x20/0x20 [ 38.410264] ? locks_remove_file+0x3fa/0x5a0 [ 38.410269] ep_free+0x13f/0x320 [ 38.410273] ? ep_remove+0x800/0x800 [ 38.410276] ? fsnotify_first_mark+0x2b0/0x2b0 [ 38.410281] ? ep_free+0x320/0x320 [ 38.410284] ep_eventpoll_release+0x44/0x60 [ 38.410288] __fput+0x327/0x7e0 [ 38.410293] ? fput+0x140/0x140 [ 38.410297] ? _raw_spin_unlock_irq+0x27/0x70 [ 38.410302] ____fput+0x15/0x20 [ 38.410306] task_work_run+0x199/0x270 [ 38.410310] ? task_work_cancel+0x210/0x210 [ 38.410314] ? _raw_spin_unlock+0x22/0x30 [ 38.410318] ? switch_task_namespaces+0x87/0xc0 [ 38.410322] do_exit+0x9bb/0x1ad0 [ 38.410326] ? __handle_mm_fault+0x2330/0x3ce0 [ 38.410330] ? mm_update_next_owner+0x930/0x930 [ 38.410336] ? do_raw_spin_trylock+0x190/0x190 [ 38.410340] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.410343] ? check_noncircular+0x20/0x20 [ 38.410348] ? _raw_spin_unlock+0x22/0x30 [ 38.410351] ? __handle_mm_fault+0x80e/0x3ce0 [ 38.410356] ? check_noncircular+0x20/0x20 [ 38.410359] ? __pmd_alloc+0x4e0/0x4e0 [ 38.410362] ? lock_downgrade+0x980/0x980 [ 38.410366] ? find_held_lock+0x35/0x1d0 [ 38.410371] ? handle_mm_fault+0x248/0x8d0 [ 38.410375] ? find_held_lock+0x35/0x1d0 [ 38.410381] ? __do_page_fault+0x5f7/0xc90 [ 38.410385] ? lock_downgrade+0x980/0x980 [ 38.410390] ? handle_mm_fault+0x410/0x8d0 [ 38.410393] ? down_read_trylock+0xdb/0x170 [ 38.410396] ? __do_page_fault+0x32d/0xc90 [ 38.410400] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 38.410404] ? vmacache_find+0x5f/0x280 [ 38.410409] do_group_exit+0x149/0x400 [ 38.410412] ? __do_page_fault+0x3d6/0xc90 [ 38.410416] ? SyS_exit+0x30/0x30 [ 38.410420] ? do_fast_syscall_32+0x156/0xf9d [ 38.410424] ? do_group_exit+0x400/0x400 [ 38.410428] SyS_exit_group+0x1d/0x20 [ 38.410431] do_fast_syscall_32+0x3ee/0xf9d [ 38.410436] ? do_int80_syscall_32+0x9d0/0x9d0 [ 38.410440] ? kasan_check_read+0x11/0x20 [ 38.410444] ? syscall_return_slowpath+0x550/0x550 [ 38.410448] ? SyS_rt_sigaction+0x94/0x1b0 [ 38.410452] ? SyS_sigprocmask+0x4b0/0x4b0 [ 38.410455] ? SyS_read+0x184/0x220 [ 38.410459] ? retint_user+0x18/0x18 [ 38.410464] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.410468] entry_SYSENTER_compat+0x54/0x63 [ 38.410471] RIP: 0023:0xf7f41c79 [ 38.410472] RSP: 002b:00000000ffa195cc EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 38.410476] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 38.410478] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 38.410480] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 38.410481] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 38.410483] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 38.430518] Dumping ftrace buffer: [ 38.430521] (ftrace buffer empty) [ 38.430524] Kernel Offset: disabled [ 39.725892] Rebooting in 86400 seconds..