Starting Permit User Sessions... Starting OpenBSD Secure Shell server... [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. Starting System Logging Service... [ OK ] Started Permit User Sessions. [ OK ] Found device /dev/ttyS0. [ OK ] Started System Logging Service. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.51' (ECDSA) to the list of known hosts. 2020/08/04 19:00:05 parsed 1 programs 2020/08/04 19:00:06 executed programs: 0 syzkaller login: [ 66.309642][ T27] audit: type=1400 audit(1596567606.305:8): avc: denied { execmem } for pid=6859 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 66.358583][ T6860] IPVS: ftp: loaded support on port[0] = 21 [ 66.457110][ T6860] chnl_net:caif_netlink_parms(): no params data found [ 66.505835][ T6860] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.513336][ T6860] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.521007][ T6860] device bridge_slave_0 entered promiscuous mode [ 66.530515][ T6860] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.538952][ T6860] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.547112][ T6860] device bridge_slave_1 entered promiscuous mode [ 66.566182][ T6860] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 66.577603][ T6860] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 66.600858][ T6860] team0: Port device team_slave_0 added [ 66.608135][ T6860] team0: Port device team_slave_1 added [ 66.625810][ T6860] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 66.632892][ T6860] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 66.658870][ T6860] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 66.671411][ T6860] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 66.678468][ T6860] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 66.705207][ T6860] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 66.774315][ T6860] device hsr_slave_0 entered promiscuous mode [ 66.822083][ T6860] device hsr_slave_1 entered promiscuous mode [ 66.937430][ T6860] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 66.973943][ T6860] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 67.004549][ T6860] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 67.064840][ T6860] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 67.127080][ T6860] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.134226][ T6860] bridge0: port 2(bridge_slave_1) entered forwarding state [ 67.141986][ T6860] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.149086][ T6860] bridge0: port 1(bridge_slave_0) entered forwarding state [ 67.193485][ T6860] 8021q: adding VLAN 0 to HW filter on device bond0 [ 67.206406][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 67.217493][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.225885][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.234102][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 67.247566][ T6860] 8021q: adding VLAN 0 to HW filter on device team0 [ 67.257940][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 67.267414][ T2993] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.274509][ T2993] bridge0: port 1(bridge_slave_0) entered forwarding state [ 67.294057][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 67.303631][ T7068] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.310659][ T7068] bridge0: port 2(bridge_slave_1) entered forwarding state [ 67.332307][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 67.340913][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 67.350465][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 67.359012][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 67.368118][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 67.377814][ T6860] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 67.395908][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 67.403794][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 67.417292][ T6860] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 67.441548][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 67.450268][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 67.466031][ T6860] device veth0_vlan entered promiscuous mode [ 67.472547][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 67.481027][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 67.490292][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 67.498448][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 67.516078][ T6860] device veth1_vlan entered promiscuous mode [ 67.535870][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 67.544871][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 67.554017][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 67.563019][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 67.573880][ T6860] device veth0_macvtap entered promiscuous mode [ 67.584270][ T6860] device veth1_macvtap entered promiscuous mode [ 67.599928][ T6860] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 67.607479][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 67.616970][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 67.625154][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 67.634864][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 67.647903][ T6860] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 67.655217][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 67.664685][ T7068] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 69.506643][ T7089] ================================================================== [ 69.506690][ T7089] BUG: KASAN: use-after-free in vc_do_resize+0x9d6/0x13f0 [ 69.506699][ T7089] Read of size 2 at addr ffff8880a28e1782 by task syz-executor.0/7089 [ 69.506701][ T7089] [ 69.506716][ T7089] CPU: 1 PID: 7089 Comm: syz-executor.0 Not tainted 5.8.0-syzkaller #0 [ 69.506721][ T7089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.506725][ T7089] Call Trace: [ 69.506737][ T7089] dump_stack+0x18f/0x20d [ 69.506747][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.506754][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.506765][ T7089] print_address_description.constprop.0.cold+0xae/0x436 [ 69.506778][ T7089] ? vprintk_func+0x97/0x1a6 [ 69.506788][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.506795][ T7089] kasan_report.cold+0x1f/0x37 [ 69.506805][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.506815][ T7089] check_memory_region+0x13d/0x180 [ 69.506823][ T7089] memcpy+0x20/0x60 [ 69.506832][ T7089] vc_do_resize+0x9d6/0x13f0 [ 69.506849][ T7089] ? store_bind+0x6a0/0x6a0 [ 69.506861][ T7089] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 69.506876][ T7089] fbcon_modechanged+0x36c/0x710 [ 69.506888][ T7089] fbcon_update_vcs+0x3a/0x50 [ 69.506896][ T7089] fb_set_var+0xae8/0xd60 [ 69.506905][ T7089] ? fb_blank+0x190/0x190 [ 69.506917][ T7089] ? lock_release+0x8e0/0x8e0 [ 69.506937][ T7089] ? lock_is_held_type+0xbb/0xf0 [ 69.506961][ T7089] ? do_fb_ioctl+0x2f2/0x6c0 [ 69.506995][ T7089] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 69.507008][ T7089] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 69.507018][ T7089] ? trace_hardirqs_on+0x5f/0x220 [ 69.507029][ T7089] do_fb_ioctl+0x33f/0x6c0 [ 69.507038][ T7089] ? fb_set_suspend+0x1a0/0x1a0 [ 69.507048][ T7089] ? tomoyo_execute_permission+0x470/0x470 [ 69.507062][ T7089] ? lock_is_held_type+0xbb/0xf0 [ 69.507076][ T7089] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 69.507086][ T7089] ? do_vfs_ioctl+0x27d/0x1090 [ 69.507105][ T7089] ? __fget_files+0x294/0x400 [ 69.507117][ T7089] fb_ioctl+0xdd/0x130 [ 69.507125][ T7089] ? do_fb_ioctl+0x6c0/0x6c0 [ 69.507132][ T7089] ksys_ioctl+0x11a/0x180 [ 69.507142][ T7089] __x64_sys_ioctl+0x6f/0xb0 [ 69.507150][ T7089] ? lockdep_hardirqs_on+0x76/0xf0 [ 69.507160][ T7089] do_syscall_64+0x60/0xe0 [ 69.507169][ T7089] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.507177][ T7089] RIP: 0033:0x45cce9 [ 69.507187][ T7089] Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.507193][ T7089] RSP: 002b:00007f1fabeb5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 69.507202][ T7089] RAX: ffffffffffffffda RBX: 000000000000d540 RCX: 000000000045cce9 [ 69.507207][ T7089] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 69.507213][ T7089] RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 [ 69.507218][ T7089] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c [ 69.507224][ T7089] R13: 00007ffd113d190f R14: 00007f1fabeb69c0 R15: 000000000078bf0c [ 69.507234][ T7089] [ 69.507238][ T7089] Allocated by task 7088: [ 69.507246][ T7089] save_stack+0x1b/0x40 [ 69.507254][ T7089] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 69.507263][ T7089] __kmalloc+0x17a/0x340 [ 69.507270][ T7089] tomoyo_encode2.part.0+0xe9/0x3a0 [ 69.507277][ T7089] tomoyo_encode+0x28/0x50 [ 69.507285][ T7089] tomoyo_path_perm+0x35f/0x3f0 [ 69.507292][ T7089] tomoyo_path_symlink+0x94/0xe0 [ 69.507301][ T7089] security_path_symlink+0xdf/0x150 [ 69.507308][ T7089] do_symlinkat+0x123/0x2c0 [ 69.507316][ T7089] do_syscall_64+0x60/0xe0 [ 69.507324][ T7089] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.507326][ T7089] [ 69.507330][ T7089] Freed by task 7088: [ 69.507336][ T7089] save_stack+0x1b/0x40 [ 69.507343][ T7089] __kasan_slab_free+0xf5/0x140 [ 69.507349][ T7089] kfree+0x103/0x2c0 [ 69.507357][ T7089] tomoyo_path_perm+0x3a7/0x3f0 [ 69.507364][ T7089] tomoyo_path_symlink+0x94/0xe0 [ 69.507372][ T7089] security_path_symlink+0xdf/0x150 [ 69.507378][ T7089] do_symlinkat+0x123/0x2c0 [ 69.507386][ T7089] do_syscall_64+0x60/0xe0 [ 69.507394][ T7089] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.507397][ T7089] [ 69.507403][ T7089] The buggy address belongs to the object at ffff8880a28e1780 [ 69.507403][ T7089] which belongs to the cache kmalloc-32 of size 32 [ 69.507410][ T7089] The buggy address is located 2 bytes inside of [ 69.507410][ T7089] 32-byte region [ffff8880a28e1780, ffff8880a28e17a0) [ 69.507413][ T7089] The buggy address belongs to the page: [ 69.507423][ T7089] page:ffffea00028a3840 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a28e1fc1 [ 69.507430][ T7089] flags: 0xfffe0000000200(slab) [ 69.507442][ T7089] raw: 00fffe0000000200 ffffea00029cb8c8 ffff8880aa001240 ffff8880aa0001c0 [ 69.507452][ T7089] raw: ffff8880a28e1fc1 ffff8880a28e1000 0000000100000027 0000000000000000 [ 69.507456][ T7089] page dumped because: kasan: bad access detected [ 69.507458][ T7089] [ 69.507461][ T7089] Memory state around the buggy address: [ 69.507467][ T7089] ffff8880a28e1680: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc [ 69.507474][ T7089] ffff8880a28e1700: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc [ 69.507480][ T7089] >ffff8880a28e1780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 69.507483][ T7089] ^ [ 69.507489][ T7089] ffff8880a28e1800: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 69.507496][ T7089] ffff8880a28e1880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 69.507499][ T7089] ================================================================== [ 69.507502][ T7089] Disabling lock debugging due to kernel taint [ 69.507506][ T7089] Kernel panic - not syncing: panic_on_warn set ... [ 69.507515][ T7089] CPU: 1 PID: 7089 Comm: syz-executor.0 Tainted: G B 5.8.0-syzkaller #0 [ 69.507519][ T7089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.507521][ T7089] Call Trace: [ 69.507530][ T7089] dump_stack+0x18f/0x20d [ 69.507538][ T7089] ? vc_do_resize+0x900/0x13f0 [ 69.507547][ T7089] panic+0x2e3/0x75c [ 69.507555][ T7089] ? __warn_printk+0xf3/0xf3 [ 69.507565][ T7089] ? trace_hardirqs_on+0x55/0x220 [ 69.507572][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.507578][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.507585][ T7089] end_report+0x4d/0x53 [ 69.507592][ T7089] kasan_report.cold+0xd/0x37 [ 69.507600][ T7089] ? vc_do_resize+0x9d6/0x13f0 [ 69.507608][ T7089] check_memory_region+0x13d/0x180 [ 69.507614][ T7089] memcpy+0x20/0x60 [ 69.507622][ T7089] vc_do_resize+0x9d6/0x13f0 [ 69.507632][ T7089] ? store_bind+0x6a0/0x6a0 [ 69.507641][ T7089] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 69.507651][ T7089] fbcon_modechanged+0x36c/0x710 [ 69.507660][ T7089] fbcon_update_vcs+0x3a/0x50 [ 69.507666][ T7089] fb_set_var+0xae8/0xd60 [ 69.507673][ T7089] ? fb_blank+0x190/0x190 [ 69.507681][ T7089] ? lock_release+0x8e0/0x8e0 [ 69.507689][ T7089] ? lock_is_held_type+0xbb/0xf0 [ 69.507698][ T7089] ? do_fb_ioctl+0x2f2/0x6c0 [ 69.507715][ T7089] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 69.507724][ T7089] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 69.507731][ T7089] ? trace_hardirqs_on+0x5f/0x220 [ 69.507739][ T7089] do_fb_ioctl+0x33f/0x6c0 [ 69.507746][ T7089] ? fb_set_suspend+0x1a0/0x1a0 [ 69.507755][ T7089] ? tomoyo_execute_permission+0x470/0x470 [ 69.507764][ T7089] ? lock_is_held_type+0xbb/0xf0 [ 69.507773][ T7089] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 69.507780][ T7089] ? do_vfs_ioctl+0x27d/0x1090 [ 69.507791][ T7089] ? __fget_files+0x294/0x400 [ 69.507799][ T7089] fb_ioctl+0xdd/0x130 [ 69.507805][ T7089] ? do_fb_ioctl+0x6c0/0x6c0 [ 69.507812][ T7089] ksys_ioctl+0x11a/0x180 [ 69.507820][ T7089] __x64_sys_ioctl+0x6f/0xb0 [ 69.507827][ T7089] ? lockdep_hardirqs_on+0x76/0xf0 [ 69.507835][ T7089] do_syscall_64+0x60/0xe0 [ 69.507843][ T7089] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.507848][ T7089] RIP: 0033:0x45cce9 [ 69.507856][ T7089] Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.507860][ T7089] RSP: 002b:00007f1fabeb5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 69.507867][ T7089] RAX: ffffffffffffffda RBX: 000000000000d540 RCX: 000000000045cce9 [ 69.507872][ T7089] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 69.507877][ T7089] RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 [ 69.507881][ T7089] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c [ 69.507886][ T7089] R13: 00007ffd113d190f R14: 00007f1fabeb69c0 R15: 000000000078bf0c [ 69.509202][ T7089] Kernel Offset: disabled [ 70.354668][ T7089] Rebooting in 86400 seconds..