[....] Starting enhanced syslogd: rsyslogd[ 12.465766] audit: type=1400 audit(1515664526.720:5): avc: denied { syslog } for pid=3340 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 18.992916] audit: type=1400 audit(1515664533.247:6): avc: denied { map } for pid=3480 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 '10.128.15.201' (ECDSA) to the list of known hosts. executing program [ 25.184152] audit: type=1400 audit(1515664539.438:7): avc: denied { map } for pid=3494 comm="syzkaller694930" path="/root/syzkaller694930826" 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 [ 25.188502] ================================================================== [ 25.188514] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 25.188518] Read of size 8 at addr ffff8801c8e63d30 by task syzkaller694930/3494 [ 25.188518] [ 25.188524] CPU: 0 PID: 3494 Comm: syzkaller694930 Not tainted 4.15.0-rc7+ #167 [ 25.188526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.188528] Call Trace: [ 25.188535] dump_stack+0x194/0x257 [ 25.188540] ? arch_local_irq_restore+0x53/0x53 [ 25.188545] ? show_regs_print_info+0x18/0x18 [ 25.188549] ? print_irqtrace_events+0x270/0x270 [ 25.188552] ? __lock_acquire+0x664/0x3e00 [ 25.188562] ? __lock_acquire+0x3d4d/0x3e00 [ 25.188568] print_address_description+0x73/0x250 [ 25.188572] ? __lock_acquire+0x3d4d/0x3e00 [ 25.188575] kasan_report+0x25b/0x340 [ 25.188581] __asan_report_load8_noabort+0x14/0x20 [ 25.188584] __lock_acquire+0x3d4d/0x3e00 [ 25.188588] ? __lock_acquire+0x664/0x3e00 [ 25.188591] ? lock_downgrade+0x980/0x980 [ 25.188594] ? lock_downgrade+0x980/0x980 [ 25.188598] ? print_irqtrace_events+0x270/0x270 [ 25.188604] ? remove_wait_queue+0x81/0x350 [ 25.188610] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.188613] ? __lock_acquire+0x664/0x3e00 [ 25.188617] ? check_noncircular+0x20/0x20 [ 25.188624] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.188628] ? lock_acquire+0x1d5/0x580 [ 25.188631] ? lock_acquire+0x1d5/0x580 [ 25.188636] ? ep_free+0xf4/0x320 [ 25.188641] ? lock_release+0xa40/0xa40 [ 25.188645] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.188649] ? print_irqtrace_events+0x270/0x270 [ 25.188652] ? print_irqtrace_events+0x270/0x270 [ 25.188658] ? rcu_note_context_switch+0x710/0x710 [ 25.188662] ? __might_sleep+0x95/0x190 [ 25.188666] ? ep_free+0xf4/0x320 [ 25.188670] ? __mutex_lock+0x16f/0x1a80 [ 25.188673] ? ep_free+0xf4/0x320 [ 25.188677] ? print_irqtrace_events+0x270/0x270 [ 25.188680] ? ep_free+0xf4/0x320 [ 25.188685] lock_acquire+0x1d5/0x580 [ 25.188688] ? lock_acquire+0x1d5/0x580 [ 25.188692] ? remove_wait_queue+0x81/0x350 [ 25.188696] ? lock_release+0xa40/0xa40 [ 25.188702] ? lock_acquire+0x1d5/0x580 [ 25.188705] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.188708] ? lock_acquire+0x1d5/0x580 [ 25.188712] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.188717] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.188721] ? remove_wait_queue+0x81/0x350 [ 25.188725] remove_wait_queue+0x81/0x350 [ 25.188730] ? depot_save_stack+0x3b5/0x490 [ 25.188734] ? add_wait_queue+0x290/0x290 [ 25.188737] ? rcutorture_record_progress+0x10/0x10 [ 25.188741] ? lock_release+0xa40/0xa40 [ 25.188746] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.188752] ? __kernel_text_address+0xd/0x40 [ 25.188757] ? clear_tfile_check_list+0x370/0x370 [ 25.188761] ? check_noncircular+0x20/0x20 [ 25.188767] ? locks_remove_file+0x3fa/0x5a0 [ 25.188772] ep_free+0x13f/0x320 [ 25.188776] ? ep_remove+0x800/0x800 [ 25.188780] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.188785] ? ep_free+0x320/0x320 [ 25.188788] ep_eventpoll_release+0x44/0x60 [ 25.188793] __fput+0x327/0x7e0 [ 25.188798] ? fput+0x140/0x140 [ 25.188802] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.188807] ____fput+0x15/0x20 [ 25.188811] task_work_run+0x199/0x270 [ 25.188816] ? task_work_cancel+0x210/0x210 [ 25.188820] ? _raw_spin_unlock+0x22/0x30 [ 25.188824] ? switch_task_namespaces+0x87/0xc0 [ 25.188830] do_exit+0x9bb/0x1ad0 [ 25.188835] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.188839] ? mm_update_next_owner+0x930/0x930 [ 25.188845] ? do_raw_spin_trylock+0x190/0x190 [ 25.188849] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.188853] ? check_noncircular+0x20/0x20 [ 25.188857] ? _raw_spin_unlock+0x22/0x30 [ 25.188861] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.188865] ? check_noncircular+0x20/0x20 [ 25.188868] ? __pmd_alloc+0x4e0/0x4e0 [ 25.188871] ? lock_downgrade+0x980/0x980 [ 25.188876] ? find_held_lock+0x35/0x1d0 [ 25.188881] ? handle_mm_fault+0x248/0x8d0 [ 25.188885] ? find_held_lock+0x35/0x1d0 [ 25.188892] ? __do_page_fault+0x5f7/0xc90 [ 25.188895] ? lock_downgrade+0x980/0x980 [ 25.188900] ? handle_mm_fault+0x410/0x8d0 [ 25.188903] ? down_read_trylock+0xdb/0x170 [ 25.188906] ? __do_page_fault+0x32d/0xc90 [ 25.188910] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.188914] ? vmacache_find+0x5f/0x280 [ 25.188919] do_group_exit+0x149/0x400 [ 25.188923] ? __do_page_fault+0x3d6/0xc90 [ 25.188926] ? SyS_exit+0x30/0x30 [ 25.188932] ? do_fast_syscall_32+0x156/0xf9d [ 25.188936] ? do_group_exit+0x400/0x400 [ 25.188939] SyS_exit_group+0x1d/0x20 [ 25.188943] do_fast_syscall_32+0x3ee/0xf9d [ 25.188948] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.188952] ? kasan_check_read+0x11/0x20 [ 25.188956] ? syscall_return_slowpath+0x550/0x550 [ 25.188961] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.188965] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.188968] ? SyS_read+0x184/0x220 [ 25.188972] ? retint_user+0x18/0x18 [ 25.188977] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.188981] entry_SYSENTER_compat+0x54/0x63 [ 25.188985] RIP: 0023:0xf7fdbc79 [ 25.188987] RSP: 002b:00000000fff896dc EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 25.188991] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.188993] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 25.188995] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.188997] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.188999] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.189006] [ 25.189008] Allocated by task 3494: [ 25.189012] save_stack+0x43/0xd0 [ 25.189014] kasan_kmalloc+0xad/0xe0 [ 25.189017] kmem_cache_alloc_trace+0x136/0x750 [ 25.189022] binder_get_thread+0x1cf/0x870 [ 25.189025] binder_poll+0x8c/0x390 [ 25.189028] ep_item_poll.isra.10+0xec/0x320 [ 25.189031] ep_insert+0x6a3/0x1b10 [ 25.189034] SyS_epoll_ctl+0x12e4/0x1ab0 [ 25.189037] do_fast_syscall_32+0x3ee/0xf9d [ 25.189040] entry_SYSENTER_compat+0x54/0x63 [ 25.189041] [ 25.189042] Freed by task 3494: [ 25.189045] save_stack+0x43/0xd0 [ 25.189048] kasan_slab_free+0x71/0xc0 [ 25.189050] kfree+0xd6/0x260 [ 25.189053] binder_thread_dec_tmpref+0x27f/0x310 [ 25.189056] binder_thread_release+0x27d/0x540 [ 25.189058] binder_ioctl+0xc02/0x1417 [ 25.189062] compat_SyS_ioctl+0x151/0x2a30 [ 25.189065] do_fast_syscall_32+0x3ee/0xf9d [ 25.189067] entry_SYSENTER_compat+0x54/0x63 [ 25.189068] [ 25.189070] The buggy address belongs to the object at ffff8801c8e63c80 [ 25.189070] which belongs to the cache kmalloc-512 of size 512 [ 25.189074] The buggy address is located 176 bytes inside of [ 25.189074] 512-byte region [ffff8801c8e63c80, ffff8801c8e63e80) [ 25.189074] The buggy address belongs to the page: [ 25.189078] page:ffffea00072398c0 count:1 mapcount:0 mapping:ffff8801c8e63000 index:0x0 [ 25.189081] flags: 0x2fffc0000000100(slab) [ 25.189087] raw: 02fffc0000000100 ffff8801c8e63000 0000000000000000 0000000100000006 [ 25.189091] raw: ffffea000723b560 ffffea000723b5e0 ffff8801dac00940 0000000000000000 [ 25.189093] page dumped because: kasan: bad access detected [ 25.189093] [ 25.189094] Memory state around the buggy address: [ 25.189097] ffff8801c8e63c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.189100] ffff8801c8e63c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.189102] >ffff8801c8e63d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.189103] ^ [ 25.189106] ffff8801c8e63d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.189108] ffff8801c8e63e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.189109] ================================================================== [ 25.189110] Disabling lock debugging due to kernel taint [ 25.189112] Kernel panic - not syncing: panic_on_warn set ... [ 25.189112] [ 25.189116] CPU: 0 PID: 3494 Comm: syzkaller694930 Tainted: G B 4.15.0-rc7+ #167 [ 25.189118] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.189119] Call Trace: [ 25.189123] dump_stack+0x194/0x257 [ 25.189127] ? arch_local_irq_restore+0x53/0x53 [ 25.189131] ? kasan_end_report+0x32/0x50 [ 25.189134] ? lock_downgrade+0x980/0x980 [ 25.189139] ? vsnprintf+0x1ed/0x1900 [ 25.189143] ? __lock_acquire+0x3cb0/0x3e00 [ 25.189146] panic+0x1e4/0x41c [ 25.189149] ? refcount_error_report+0x214/0x214 [ 25.189153] ? add_taint+0x40/0x50 [ 25.189156] ? add_taint+0x1c/0x50 [ 25.189160] ? __lock_acquire+0x3d4d/0x3e00 [ 25.189164] kasan_end_report+0x50/0x50 [ 25.189167] kasan_report+0x144/0x340 [ 25.189172] __asan_report_load8_noabort+0x14/0x20 [ 25.189175] __lock_acquire+0x3d4d/0x3e00 [ 25.189179] ? __lock_acquire+0x664/0x3e00 [ 25.189182] ? lock_downgrade+0x980/0x980 [ 25.189185] ? lock_downgrade+0x980/0x980 [ 25.189189] ? print_irqtrace_events+0x270/0x270 [ 25.189192] ? remove_wait_queue+0x81/0x350 [ 25.189197] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.189201] ? __lock_acquire+0x664/0x3e00 [ 25.189204] ? check_noncircular+0x20/0x20 [ 25.189211] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.189215] ? lock_acquire+0x1d5/0x580 [ 25.189218] ? lock_acquire+0x1d5/0x580 [ 25.189221] ? ep_free+0xf4/0x320 [ 25.189226] ? lock_release+0xa40/0xa40 [ 25.189229] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.189233] ? print_irqtrace_events+0x270/0x270 [ 25.189236] ? print_irqtrace_events+0x270/0x270 [ 25.189240] ? rcu_note_context_switch+0x710/0x710 [ 25.189244] ? __might_sleep+0x95/0x190 [ 25.189248] ? ep_free+0xf4/0x320 [ 25.189251] ? __mutex_lock+0x16f/0x1a80 [ 25.189254] ? ep_free+0xf4/0x320 [ 25.189258] ? print_irqtrace_events+0x270/0x270 [ 25.189261] ? ep_free+0xf4/0x320 [ 25.189265] lock_acquire+0x1d5/0x580 [ 25.189269] ? lock_acquire+0x1d5/0x580 [ 25.189272] ? remove_wait_queue+0x81/0x350 [ 25.189277] ? lock_release+0xa40/0xa40 [ 25.189282] ? lock_acquire+0x1d5/0x580 [ 25.189285] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.189288] ? lock_acquire+0x1d5/0x580 [ 25.189292] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 25.189296] _raw_spin_lock_irqsave+0x96/0xc0 [ 25.189300] ? remove_wait_queue+0x81/0x350 [ 25.189303] remove_wait_queue+0x81/0x350 [ 25.189307] ? depot_save_stack+0x3b5/0x490 [ 25.189311] ? add_wait_queue+0x290/0x290 [ 25.189314] ? rcutorture_record_progress+0x10/0x10 [ 25.189317] ? lock_release+0xa40/0xa40 [ 25.189323] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 25.189327] ? __kernel_text_address+0xd/0x40 [ 25.189331] ? clear_tfile_check_list+0x370/0x370 [ 25.189335] ? check_noncircular+0x20/0x20 [ 25.189340] ? locks_remove_file+0x3fa/0x5a0 [ 25.189345] ep_free+0x13f/0x320 [ 25.189349] ? ep_remove+0x800/0x800 [ 25.189352] ? fsnotify_first_mark+0x2b0/0x2b0 [ 25.189356] ? ep_free+0x320/0x320 [ 25.189360] ep_eventpoll_release+0x44/0x60 [ 25.189364] __fput+0x327/0x7e0 [ 25.189368] ? fput+0x140/0x140 [ 25.189372] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.189377] ____fput+0x15/0x20 [ 25.189381] task_work_run+0x199/0x270 [ 25.189385] ? task_work_cancel+0x210/0x210 [ 25.189389] ? _raw_spin_unlock+0x22/0x30 [ 25.189392] ? switch_task_namespaces+0x87/0xc0 [ 25.189397] do_exit+0x9bb/0x1ad0 [ 25.189400] ? __handle_mm_fault+0x2330/0x3ce0 [ 25.189405] ? mm_update_next_owner+0x930/0x930 [ 25.189410] ? do_raw_spin_trylock+0x190/0x190 [ 25.189414] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.189418] ? check_noncircular+0x20/0x20 [ 25.189422] ? _raw_spin_unlock+0x22/0x30 [ 25.189425] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.189430] ? check_noncircular+0x20/0x20 [ 25.189432] ? __pmd_alloc+0x4e0/0x4e0 [ 25.189435] ? lock_downgrade+0x980/0x980 [ 25.189440] ? find_held_lock+0x35/0x1d0 [ 25.189445] ? handle_mm_fault+0x248/0x8d0 [ 25.189449] ? find_held_lock+0x35/0x1d0 [ 25.189454] ? __do_page_fault+0x5f7/0xc90 [ 25.189457] ? lock_downgrade+0x980/0x980 [ 25.189462] ? handle_mm_fault+0x410/0x8d0 [ 25.189465] ? down_read_trylock+0xdb/0x170 [ 25.189468] ? __do_page_fault+0x32d/0xc90 [ 25.189472] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.189475] ? vmacache_find+0x5f/0x280 [ 25.189480] do_group_exit+0x149/0x400 [ 25.189484] ? __do_page_fault+0x3d6/0xc90 [ 25.189487] ? SyS_exit+0x30/0x30 [ 25.189492] ? do_fast_syscall_32+0x156/0xf9d [ 25.189495] ? do_group_exit+0x400/0x400 [ 25.189499] SyS_exit_group+0x1d/0x20 [ 25.189502] do_fast_syscall_32+0x3ee/0xf9d [ 25.189507] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.189511] ? kasan_check_read+0x11/0x20 [ 25.189515] ? syscall_return_slowpath+0x550/0x550 [ 25.189519] ? SyS_rt_sigaction+0x94/0x1b0 [ 25.189522] ? SyS_sigprocmask+0x4b0/0x4b0 [ 25.189525] ? SyS_read+0x184/0x220 [ 25.189529] ? retint_user+0x18/0x18 [ 25.189534] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.189538] entry_SYSENTER_compat+0x54/0x63 [ 25.189541] RIP: 0023:0xf7fdbc79 [ 25.189542] RSP: 002b:00000000fff896dc EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 25.189546] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 25.189548] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 25.189550] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.189552] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.189553] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.210379] Dumping ftrace buffer: [ 25.210381] (ftrace buffer empty) [ 25.210383] Kernel Offset: disabled [ 26.490280] Rebooting in 86400 seconds..