[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.320231] kauditd_printk_skb: 10 callbacks suppressed [ 34.320245] audit: type=1400 audit(1544590230.543:35): avc: denied { map } for pid=6057 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 '10.128.0.77' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 40.957238] audit: type=1400 audit(1544590237.183:36): avc: denied { map } for pid=6071 comm="syz-executor908" path="/root/syz-executor908397074" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 66.164622] ================================================================== [ 66.172132] BUG: KASAN: use-after-free in tipc_group_bc_cong+0x327/0x3f0 [ 66.178965] Read of size 2 at addr ffff8881c230e374 by task syz-executor908/17486 [ 66.186563] [ 66.188174] CPU: 0 PID: 17486 Comm: syz-executor908 Not tainted 4.20.0-rc6+ #151 [ 66.195690] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.205042] Call Trace: [ 66.207626] dump_stack+0x244/0x39d [ 66.211267] ? dump_stack_print_info.cold.1+0x20/0x20 [ 66.216561] ? printk+0xa7/0xcf [ 66.219821] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 66.224556] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 66.229657] print_address_description.cold.7+0x9/0x1ff [ 66.235005] kasan_report.cold.8+0x242/0x309 [ 66.239396] ? tipc_group_bc_cong+0x327/0x3f0 [ 66.243879] __asan_report_load2_noabort+0x14/0x20 [ 66.248820] tipc_group_bc_cong+0x327/0x3f0 [ 66.253130] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 66.258216] ? tipc_group_cong+0x5d0/0x5d0 [ 66.262441] ? remove_wait_queue+0x1a6/0x360 [ 66.266840] ? add_wait_queue+0x2b0/0x2b0 [ 66.270976] ? __local_bh_enable_ip+0x160/0x260 [ 66.275629] tipc_send_group_bcast+0x50a/0xd90 [ 66.280320] ? tipc_sk_sock_err.isra.61+0x2f0/0x2f0 [ 66.285320] ? __init_waitqueue_head+0x150/0x150 [ 66.290057] ? refill_pi_state_cache.part.8+0x310/0x310 [ 66.295413] ? mark_held_locks+0x130/0x130 [ 66.299635] ? avc_has_perm+0x469/0x7e0 [ 66.303596] ? lock_downgrade+0x900/0x900 [ 66.307729] ? check_preemption_disabled+0x48/0x280 [ 66.312747] __tipc_sendmsg+0xeec/0x1d40 [ 66.316790] ? rcu_softirq_qs+0x20/0x20 [ 66.320770] ? tipc_sendmcast+0xf50/0xf50 [ 66.324905] ? zap_class+0x640/0x640 [ 66.328601] ? print_usage_bug+0xc0/0xc0 [ 66.332652] ? find_held_lock+0x36/0x1c0 [ 66.336714] ? find_held_lock+0x36/0x1c0 [ 66.340767] ? mark_held_locks+0xc7/0x130 [ 66.344898] ? __local_bh_enable_ip+0x160/0x260 [ 66.349547] ? __local_bh_enable_ip+0x160/0x260 [ 66.354211] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 66.358776] ? trace_hardirqs_on+0xbd/0x310 [ 66.363100] ? lock_release+0xa00/0xa00 [ 66.367057] ? lock_sock_nested+0xe2/0x120 [ 66.371273] ? trace_hardirqs_off_caller+0x310/0x310 [ 66.376359] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.381876] ? check_preemption_disabled+0x48/0x280 [ 66.386873] ? lock_sock_nested+0x9a/0x120 [ 66.391087] ? lock_sock_nested+0x9a/0x120 [ 66.395316] ? __local_bh_enable_ip+0x160/0x260 [ 66.400147] tipc_sendmsg+0x50/0x70 [ 66.403756] ? __tipc_sendmsg+0x1d40/0x1d40 [ 66.408064] sock_sendmsg+0xd5/0x120 [ 66.411770] ___sys_sendmsg+0x7fd/0x930 [ 66.415738] ? find_held_lock+0x36/0x1c0 [ 66.419781] ? copy_msghdr_from_user+0x580/0x580 [ 66.424521] ? __fd_install+0x2b5/0x8f0 [ 66.428481] ? check_preemption_disabled+0x48/0x280 [ 66.433486] ? __fget_light+0x2e9/0x430 [ 66.437446] ? fget_raw+0x20/0x20 [ 66.440884] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.446402] ? __fd_install+0x2f9/0x8f0 [ 66.450370] ? get_unused_fd_flags+0x1a0/0x1a0 [ 66.454948] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 66.460465] ? sockfd_lookup_light+0xc5/0x160 [ 66.464948] __sys_sendmsg+0x11d/0x280 [ 66.468837] ? __ia32_sys_shutdown+0x80/0x80 [ 66.473230] ? fput+0x130/0x1a0 [ 66.476496] ? __x64_sys_futex+0x47f/0x6a0 [ 66.480722] ? do_syscall_64+0x9a/0x820 [ 66.484691] ? do_syscall_64+0x9a/0x820 [ 66.488666] ? trace_hardirqs_off_caller+0x310/0x310 [ 66.493755] __x64_sys_sendmsg+0x78/0xb0 [ 66.497802] do_syscall_64+0x1b9/0x820 [ 66.501675] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 66.507039] ? syscall_return_slowpath+0x5e0/0x5e0 [ 66.511959] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 66.516783] ? trace_hardirqs_on_caller+0x310/0x310 [ 66.521781] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 66.526785] ? prepare_exit_to_usermode+0x291/0x3b0 [ 66.531785] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 66.536622] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.541792] RIP: 0033:0x446c19 [ 66.544971] Code: e8 ac ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 66.563852] RSP: 002b:00007f2ee3b4cce8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 66.571539] RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446c19 [ 66.578785] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000006 [ 66.586035] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 66.593285] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c [ 66.600534] R13: 00007ffe593cb29f R14: 00007f2ee3b4d9c0 R15: 00000000006dcd2c [ 66.607803] [ 66.609430] Allocated by task 17487: [ 66.613136] save_stack+0x43/0xd0 [ 66.616579] kasan_kmalloc+0xc7/0xe0 [ 66.620284] kmem_cache_alloc_trace+0x152/0x750 [ 66.624940] tipc_group_create+0x152/0xa70 [ 66.629177] tipc_setsockopt+0x2d1/0xd70 [ 66.633223] __sys_setsockopt+0x1ba/0x3c0 [ 66.637376] __x64_sys_setsockopt+0xbe/0x150 [ 66.641786] do_syscall_64+0x1b9/0x820 [ 66.645657] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.650829] [ 66.652441] Freed by task 17487: [ 66.655818] save_stack+0x43/0xd0 [ 66.659268] __kasan_slab_free+0x102/0x150 [ 66.663492] kasan_slab_free+0xe/0x10 [ 66.667281] kfree+0xcf/0x230 [ 66.670369] tipc_group_delete+0x2e4/0x3f0 [ 66.674586] tipc_sk_leave+0x113/0x220 [ 66.678455] tipc_setsockopt+0x97d/0xd70 [ 66.682497] __sys_setsockopt+0x1ba/0x3c0 [ 66.686639] __x64_sys_setsockopt+0xbe/0x150 [ 66.691042] do_syscall_64+0x1b9/0x820 [ 66.694922] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.700087] [ 66.701698] The buggy address belongs to the object at ffff8881c230e300 [ 66.701698] which belongs to the cache kmalloc-192 of size 192 [ 66.714334] The buggy address is located 116 bytes inside of [ 66.714334] 192-byte region [ffff8881c230e300, ffff8881c230e3c0) [ 66.726199] The buggy address belongs to the page: [ 66.731197] page:ffffea000708c380 count:1 mapcount:0 mapping:ffff8881da800040 index:0x0 [ 66.739407] flags: 0x2fffc0000000200(slab) [ 66.743628] raw: 02fffc0000000200 ffffea0006f0f448 ffffea00070f0a08 ffff8881da800040 [ 66.751492] raw: 0000000000000000 ffff8881c230e000 0000000100000010 0000000000000000 [ 66.759350] page dumped because: kasan: bad access detected [ 66.765233] [ 66.766852] Memory state around the buggy address: [ 66.771761] ffff8881c230e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.779103] ffff8881c230e280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 66.786443] >ffff8881c230e300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.793784] ^ [ 66.800778] ffff8881c230e380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 66.808117] ffff8881c230e400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 66.815469] ================================================================== [ 66.822808] Disabling lock debugging due to kernel taint [ 66.829102] Kernel panic - not syncing: panic_on_warn set ... [ 66.835005] CPU: 0 PID: 17486 Comm: syz-executor908 Tainted: G B 4.20.0-rc6+ #151 [ 66.843916] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.853249] Call Trace: [ 66.855824] dump_stack+0x244/0x39d [ 66.859545] ? dump_stack_print_info.cold.1+0x20/0x20 [ 66.864722] panic+0x2ad/0x55c [ 66.867904] ? add_taint.cold.5+0x16/0x16 [ 66.872041] ? preempt_schedule+0x4d/0x60 [ 66.876212] ? ___preempt_schedule+0x16/0x18 [ 66.880603] ? trace_hardirqs_on+0xb4/0x310 [ 66.884920] kasan_end_report+0x47/0x4f [ 66.888873] kasan_report.cold.8+0x76/0x309 [ 66.893186] ? tipc_group_bc_cong+0x327/0x3f0 [ 66.897665] __asan_report_load2_noabort+0x14/0x20 [ 66.902574] tipc_group_bc_cong+0x327/0x3f0 [ 66.906883] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 66.911972] ? tipc_group_cong+0x5d0/0x5d0 [ 66.916190] ? remove_wait_queue+0x1a6/0x360 [ 66.920580] ? add_wait_queue+0x2b0/0x2b0 [ 66.924711] ? __local_bh_enable_ip+0x160/0x260 [ 66.929364] tipc_send_group_bcast+0x50a/0xd90 [ 66.933930] ? tipc_sk_sock_err.isra.61+0x2f0/0x2f0 [ 66.938929] ? __init_waitqueue_head+0x150/0x150 [ 66.943664] ? refill_pi_state_cache.part.8+0x310/0x310 [ 66.949037] ? mark_held_locks+0x130/0x130 [ 66.953258] ? avc_has_perm+0x469/0x7e0 [ 66.957228] ? lock_downgrade+0x900/0x900 [ 66.961357] ? check_preemption_disabled+0x48/0x280 [ 66.966366] __tipc_sendmsg+0xeec/0x1d40 [ 66.970412] ? rcu_softirq_qs+0x20/0x20 [ 66.974387] ? tipc_sendmcast+0xf50/0xf50 [ 66.978518] ? zap_class+0x640/0x640 [ 66.982209] ? print_usage_bug+0xc0/0xc0 [ 66.986251] ? find_held_lock+0x36/0x1c0 [ 66.990293] ? find_held_lock+0x36/0x1c0 [ 66.994350] ? mark_held_locks+0xc7/0x130 [ 66.998476] ? __local_bh_enable_ip+0x160/0x260 [ 67.003124] ? __local_bh_enable_ip+0x160/0x260 [ 67.007776] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 67.012334] ? trace_hardirqs_on+0xbd/0x310 [ 67.016647] ? lock_release+0xa00/0xa00 [ 67.020602] ? lock_sock_nested+0xe2/0x120 [ 67.024819] ? trace_hardirqs_off_caller+0x310/0x310 [ 67.029909] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 67.035425] ? check_preemption_disabled+0x48/0x280 [ 67.040421] ? lock_sock_nested+0x9a/0x120 [ 67.044635] ? lock_sock_nested+0x9a/0x120 [ 67.048848] ? __local_bh_enable_ip+0x160/0x260 [ 67.053507] tipc_sendmsg+0x50/0x70 [ 67.057120] ? __tipc_sendmsg+0x1d40/0x1d40 [ 67.061432] sock_sendmsg+0xd5/0x120 [ 67.065124] ___sys_sendmsg+0x7fd/0x930 [ 67.069091] ? find_held_lock+0x36/0x1c0 [ 67.073135] ? copy_msghdr_from_user+0x580/0x580 [ 67.077884] ? __fd_install+0x2b5/0x8f0 [ 67.081841] ? check_preemption_disabled+0x48/0x280 [ 67.086843] ? __fget_light+0x2e9/0x430 [ 67.090827] ? fget_raw+0x20/0x20 [ 67.094273] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 67.099789] ? __fd_install+0x2f9/0x8f0 [ 67.103764] ? get_unused_fd_flags+0x1a0/0x1a0 [ 67.108430] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 67.113947] ? sockfd_lookup_light+0xc5/0x160 [ 67.118423] __sys_sendmsg+0x11d/0x280 [ 67.122297] ? __ia32_sys_shutdown+0x80/0x80 [ 67.126690] ? fput+0x130/0x1a0 [ 67.129965] ? __x64_sys_futex+0x47f/0x6a0 [ 67.134182] ? do_syscall_64+0x9a/0x820 [ 67.138141] ? do_syscall_64+0x9a/0x820 [ 67.142097] ? trace_hardirqs_off_caller+0x310/0x310 [ 67.147195] __x64_sys_sendmsg+0x78/0xb0 [ 67.151244] do_syscall_64+0x1b9/0x820 [ 67.155113] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 67.160483] ? syscall_return_slowpath+0x5e0/0x5e0 [ 67.165395] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.170219] ? trace_hardirqs_on_caller+0x310/0x310 [ 67.175228] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 67.180247] ? prepare_exit_to_usermode+0x291/0x3b0 [ 67.185249] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.190074] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 67.195241] RIP: 0033:0x446c19 [ 67.198434] Code: e8 ac ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 67.217314] RSP: 002b:00007f2ee3b4cce8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 67.225000] RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446c19 [ 67.232246] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000006 [ 67.239523] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 67.246775] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c [ 67.254024] R13: 00007ffe593cb29f R14: 00007f2ee3b4d9c0 R15: 00000000006dcd2c [ 67.262402] Kernel Offset: disabled [ 67.266025] Rebooting in 86400 seconds..