[ 46.135417] audit: type=1800 audit(1545840959.784:30): pid=8272 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [....] 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: [ 50.775555] kauditd_printk_skb: 4 callbacks suppressed [ 50.775570] audit: type=1400 audit(1545840964.454:35): avc: denied { map } for pid=8449 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 '10.128.0.71' (ECDSA) to the list of known hosts. [ 106.312741] audit: type=1400 audit(1545841019.994:36): avc: denied { map } for pid=8461 comm="syz-execprog" path="/root/syz-execprog" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 2018/12/26 16:17:00 parsed 1 programs [ 107.043271] audit: type=1400 audit(1545841020.724:37): avc: denied { map } for pid=8461 comm="syz-execprog" path="/sys/kernel/debug/kcov" dev="debugfs" ino=3197 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1 [ 107.444755] audit: type=1400 audit(1545841021.124:38): avc: denied { map } for pid=8470 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 2018/12/26 16:17:02 executed programs: 0 [ 108.656496] IPVS: ftp: loaded support on port[0] = 21 [ 108.928379] bridge0: port 1(bridge_slave_0) entered blocking state [ 108.935403] bridge0: port 1(bridge_slave_0) entered disabled state [ 108.942934] device bridge_slave_0 entered promiscuous mode [ 108.963806] bridge0: port 2(bridge_slave_1) entered blocking state [ 108.970270] bridge0: port 2(bridge_slave_1) entered disabled state [ 108.977679] device bridge_slave_1 entered promiscuous mode [ 108.997205] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 109.015408] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 109.067903] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 109.090235] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 109.170053] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 109.179109] team0: Port device team_slave_0 added [ 109.196939] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 109.204311] team0: Port device team_slave_1 added [ 109.224810] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 109.245947] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 109.267699] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 109.288019] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 109.441374] bridge0: port 2(bridge_slave_1) entered blocking state [ 109.447826] bridge0: port 2(bridge_slave_1) entered forwarding state [ 109.454898] bridge0: port 1(bridge_slave_0) entered blocking state [ 109.461233] bridge0: port 1(bridge_slave_0) entered forwarding state [ 110.014661] 8021q: adding VLAN 0 to HW filter on device bond0 [ 110.068950] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 110.124590] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 110.130740] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 110.139043] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 110.189768] 8021q: adding VLAN 0 to HW filter on device team0 [ 110.487867] audit: type=1400 audit(1545841024.164:39): avc: denied { associate } for pid=8477 comm="syz-executor0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 2018/12/26 16:17:07 executed programs: 27 [ 113.700406] ================================================================== [ 113.707877] BUG: KASAN: stack-out-of-bounds in ax25_getname+0x58/0x790 [ 113.714528] Write of size 72 at addr ffff8881ab2ffb80 by task syz-executor0/8916 [ 113.722043] [ 113.723657] CPU: 1 PID: 8916 Comm: syz-executor0 Not tainted 4.20.0+ #169 [ 113.730562] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 113.739895] Call Trace: [ 113.742480] dump_stack+0x1d3/0x2c6 [ 113.746092] ? dump_stack_print_info.cold.1+0x20/0x20 [ 113.751265] ? printk+0xa7/0xcf [ 113.754530] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 113.759277] ? ksys_dup3+0x680/0x680 [ 113.762978] print_address_description.cold.8+0x9/0x1ff [ 113.768328] kasan_report.cold.9+0x242/0x309 [ 113.772723] ? ax25_getname+0x58/0x790 [ 113.776595] check_memory_region+0x13e/0x1b0 [ 113.780987] memset+0x23/0x40 [ 113.784097] ax25_getname+0x58/0x790 [ 113.787799] vhost_net_ioctl+0x139c/0x1bf0 [ 113.792025] ? vhost_net_buf_peek+0xa30/0xa30 [ 113.796515] ? rcu_read_unlock_special+0x1d0/0x1d0 [ 113.801430] ? kasan_check_read+0x11/0x20 [ 113.805562] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 113.810824] ? rcu_softirq_qs+0x20/0x20 [ 113.814811] ? ___might_sleep+0x1ed/0x300 [ 113.818944] ? arch_local_save_flags+0x40/0x40 [ 113.823511] ? __might_fault+0x12b/0x1e0 [ 113.827563] ? lock_downgrade+0x900/0x900 [ 113.831703] ? vhost_net_buf_peek+0xa30/0xa30 [ 113.836189] do_vfs_ioctl+0x1de/0x1790 [ 113.840068] ? ioctl_preallocate+0x300/0x300 [ 113.844465] ? selinux_file_mprotect+0x620/0x620 [ 113.849209] ? refcount_dec_not_one+0x10/0x320 [ 113.853782] ? __sanitizer_cov_trace_const_cmp2+0x1b/0x20 [ 113.859312] ? put_timespec64+0x10f/0x1b0 [ 113.863450] ? nsecs_to_jiffies+0x30/0x30 [ 113.867585] ? do_syscall_64+0x9a/0x820 [ 113.871560] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 113.877093] ? security_file_ioctl+0x94/0xc0 [ 113.881491] ksys_ioctl+0xa9/0xd0 [ 113.884958] __x64_sys_ioctl+0x73/0xb0 [ 113.888831] do_syscall_64+0x1b9/0x820 [ 113.892708] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 113.898066] ? syscall_return_slowpath+0x5e0/0x5e0 [ 113.903003] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 113.907848] ? trace_hardirqs_on_caller+0x310/0x310 [ 113.912866] ? prepare_exit_to_usermode+0x291/0x3b0 [ 113.917871] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 113.922703] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 113.927878] RIP: 0033:0x457759 [ 113.931057] Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 113.949952] RSP: 002b:00007fe338217c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 113.957663] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457759 [ 113.964924] RDX: 0000000020f1dff8 RSI: 000000004008af30 RDI: 0000000000000004 [ 113.972200] RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 [ 113.979455] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe3382186d4 [ 113.986731] R13: 00000000004c1dd4 R14: 00000000004d40e0 R15: 00000000ffffffff [ 113.993995] [ 113.995604] The buggy address belongs to the page: [ 114.000516] page:ffffea0006acbfc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 114.008646] flags: 0x2fffc0000000000() [ 114.012529] raw: 02fffc0000000000 0000000000000000 ffffffff06ac0101 0000000000000000 [ 114.020400] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 114.028349] page dumped because: kasan: bad access detected [ 114.034041] [ 114.035650] Memory state around the buggy address: [ 114.040563] ffff8881ab2ffa80: 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 [ 114.047910] ffff8881ab2ffb00: 00 f2 f2 f2 f2 f2 f2 f2 04 f2 f2 f2 f2 f2 f2 f2 [ 114.055254] >ffff8881ab2ffb80: 00 00 00 00 00 00 04 f2 00 00 00 00 00 00 00 00 [ 114.062595] ^ [ 114.067505] ffff8881ab2ffc00: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 [ 114.074863] ffff8881ab2ffc80: f2 f2 f2 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 [ 114.082203] ================================================================== [ 114.089540] Disabling lock debugging due to kernel taint [ 114.095833] Kernel panic - not syncing: panic_on_warn set ... [ 114.101743] CPU: 1 PID: 8916 Comm: syz-executor0 Tainted: G B 4.20.0+ #169 [ 114.110051] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 114.119394] Call Trace: [ 114.121997] dump_stack+0x1d3/0x2c6 [ 114.125612] ? dump_stack_print_info.cold.1+0x20/0x20 [ 114.130793] panic+0x2ad/0x55c [ 114.133968] ? add_taint.cold.5+0x16/0x16 [ 114.138099] ? preempt_schedule+0x4d/0x60 [ 114.142234] ? ___preempt_schedule+0x16/0x18 [ 114.146628] ? trace_hardirqs_on+0xb4/0x310 [ 114.150937] kasan_end_report+0x47/0x4f [ 114.154903] kasan_report.cold.9+0x76/0x309 [ 114.159213] ? ax25_getname+0x58/0x790 [ 114.163083] check_memory_region+0x13e/0x1b0 [ 114.167480] memset+0x23/0x40 [ 114.170571] ax25_getname+0x58/0x790 [ 114.174272] vhost_net_ioctl+0x139c/0x1bf0 [ 114.178502] ? vhost_net_buf_peek+0xa30/0xa30 [ 114.182993] ? rcu_read_unlock_special+0x1d0/0x1d0 [ 114.187925] ? kasan_check_read+0x11/0x20 [ 114.192056] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 114.197324] ? rcu_softirq_qs+0x20/0x20 [ 114.201298] ? ___might_sleep+0x1ed/0x300 [ 114.205432] ? arch_local_save_flags+0x40/0x40 [ 114.209999] ? __might_fault+0x12b/0x1e0 [ 114.214049] ? lock_downgrade+0x900/0x900 [ 114.218202] ? vhost_net_buf_peek+0xa30/0xa30 [ 114.222693] do_vfs_ioctl+0x1de/0x1790 [ 114.226568] ? ioctl_preallocate+0x300/0x300 [ 114.230961] ? selinux_file_mprotect+0x620/0x620 [ 114.235700] ? refcount_dec_not_one+0x10/0x320 [ 114.240271] ? __sanitizer_cov_trace_const_cmp2+0x1b/0x20 [ 114.245795] ? put_timespec64+0x10f/0x1b0 [ 114.249926] ? nsecs_to_jiffies+0x30/0x30 [ 114.254061] ? do_syscall_64+0x9a/0x820 [ 114.258023] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 114.263554] ? security_file_ioctl+0x94/0xc0 [ 114.267949] ksys_ioctl+0xa9/0xd0 [ 114.271387] __x64_sys_ioctl+0x73/0xb0 [ 114.275266] do_syscall_64+0x1b9/0x820 [ 114.279139] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 114.284497] ? syscall_return_slowpath+0x5e0/0x5e0 [ 114.289412] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 114.294240] ? trace_hardirqs_on_caller+0x310/0x310 [ 114.299243] ? prepare_exit_to_usermode+0x291/0x3b0 [ 114.304248] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 114.309082] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 114.314256] RIP: 0033:0x457759 [ 114.317438] Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 114.336329] RSP: 002b:00007fe338217c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 114.344020] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457759 [ 114.351276] RDX: 0000000020f1dff8 RSI: 000000004008af30 RDI: 0000000000000004 [ 114.358529] RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 [ 114.365783] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe3382186d4 [ 114.373039] R13: 00000000004c1dd4 R14: 00000000004d40e0 R15: 00000000ffffffff [ 114.381214] Kernel Offset: disabled [ 114.384837] Rebooting in 86400 seconds..