[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.33' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 82.229952][ T7431] ================================================================== [ 82.238223][ T7431] BUG: KASAN: use-after-free in strnlen+0x64/0x70 [ 82.244645][ T7431] Read of size 1 at addr ffff8880a88bf418 by task syz-executor172/7431 [ 82.252856][ T7431] [ 82.255194][ T7431] CPU: 0 PID: 7431 Comm: syz-executor172 Not tainted 5.8.0-rc2-syzkaller #0 [ 82.263848][ T7431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.273885][ T7431] Call Trace: [ 82.277167][ T7431] dump_stack+0x18f/0x20d [ 82.281496][ T7431] ? strnlen+0x64/0x70 [ 82.285556][ T7431] ? strnlen+0x64/0x70 [ 82.289623][ T7431] print_address_description.constprop.0.cold+0xae/0x436 [ 82.296648][ T7431] ? lock_acquire+0x1f1/0xad0 [ 82.301317][ T7431] ? vprintk_func+0x97/0x1a6 [ 82.305895][ T7431] ? strnlen+0x64/0x70 [ 82.309943][ T7431] kasan_report.cold+0x1f/0x37 [ 82.314690][ T7431] ? strnlen+0x64/0x70 [ 82.318745][ T7431] strnlen+0x64/0x70 [ 82.322635][ T7431] netdev_name_node_lookup_rcu+0x22/0x150 [ 82.328356][ T7431] dev_get_by_name+0x7b/0x1e0 [ 82.333033][ T7431] wg_get_device_start+0x2e4/0x3f0 [ 82.338136][ T7431] ? wg_set_device+0x1520/0x1520 [ 82.343058][ T7431] genl_start+0x342/0x6e0 [ 82.347385][ T7431] __netlink_dump_start+0x585/0x900 [ 82.352564][ T7431] ? genl_rcv_msg+0x9e0/0x9e0 [ 82.357219][ T7431] ? wg_get_device_start+0x3f0/0x3f0 [ 82.362482][ T7431] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 82.368181][ T7431] ? genl_rcv+0x40/0x40 [ 82.372315][ T7431] ? mutex_lock_io_nested+0xf60/0xf60 [ 82.377667][ T7431] ? apparmor_capable+0x1d8/0x460 [ 82.382670][ T7431] ? genl_rcv_msg+0x9e0/0x9e0 [ 82.387323][ T7431] ? genl_unlock+0x20/0x20 [ 82.391715][ T7431] ? genl_parallel_done+0x170/0x170 [ 82.396902][ T7431] ? ns_capable+0xde/0x100 [ 82.401324][ T7431] genl_rcv_msg+0x797/0x9e0 [ 82.405814][ T7431] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 82.412728][ T7431] ? lock_acquire+0x1f1/0xad0 [ 82.417381][ T7431] ? genl_rcv+0x15/0x40 [ 82.421517][ T7431] ? lock_release+0x8d0/0x8d0 [ 82.426178][ T7431] netlink_rcv_skb+0x15a/0x430 [ 82.430941][ T7431] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 82.437978][ T7431] ? netlink_ack+0xa10/0xa10 [ 82.442557][ T7431] genl_rcv+0x24/0x40 [ 82.446518][ T7431] netlink_unicast+0x533/0x7d0 [ 82.451262][ T7431] ? netlink_attachskb+0x810/0x810 [ 82.456364][ T7431] ? _copy_from_iter_full+0x247/0x890 [ 82.461713][ T7431] ? __phys_addr+0x9a/0x110 [ 82.466194][ T7431] ? __phys_addr_symbol+0x2c/0x70 [ 82.471198][ T7431] ? __check_object_size+0x171/0x3e4 [ 82.476474][ T7431] netlink_sendmsg+0x856/0xd90 [ 82.481230][ T7431] ? netlink_unicast+0x7d0/0x7d0 [ 82.486169][ T7431] ? netlink_unicast+0x7d0/0x7d0 [ 82.491089][ T7431] sock_sendmsg+0xcf/0x120 [ 82.495599][ T7431] ____sys_sendmsg+0x6e8/0x810 [ 82.500341][ T7431] ? kernel_sendmsg+0x50/0x50 [ 82.504995][ T7431] ? do_recvmmsg+0x6d0/0x6d0 [ 82.509561][ T7431] ? find_held_lock+0x2d/0x110 [ 82.514408][ T7431] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 82.520376][ T7431] ? lock_downgrade+0x820/0x820 [ 82.525207][ T7431] ___sys_sendmsg+0xf3/0x170 [ 82.529776][ T7431] ? sendmsg_copy_msghdr+0x160/0x160 [ 82.535039][ T7431] ? debug_object_active_state+0x260/0x350 [ 82.540829][ T7431] ? lock_downgrade+0x820/0x820 [ 82.545691][ T7431] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 82.551485][ T7431] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 82.557453][ T7431] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 82.563252][ T7431] ? debug_object_active_state+0x260/0x350 [ 82.569039][ T7431] ? trace_hardirqs_off+0x27/0x210 [ 82.574131][ T7431] ? __fget_light+0x215/0x280 [ 82.578825][ T7431] __sys_sendmsg+0xe5/0x1b0 [ 82.583315][ T7431] ? __sys_sendmsg_sock+0xb0/0xb0 [ 82.588320][ T7431] ? check_preemption_disabled+0x38/0x220 [ 82.594046][ T7431] ? do_syscall_64+0x1c/0xe0 [ 82.598619][ T7431] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 82.604577][ T7431] do_syscall_64+0x60/0xe0 [ 82.608975][ T7431] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 82.614859][ T7431] RIP: 0033:0x445299 [ 82.618723][ T7431] Code: Bad RIP value. [ 82.622763][ T7431] RSP: 002b:00007fff29192cc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 82.631155][ T7431] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445299 [ 82.639115][ T7431] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 [ 82.647069][ T7431] RBP: 0000000000014122 R08: 0000000000000000 R09: 00000000004002e0 [ 82.655029][ T7431] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402430 [ 82.662977][ T7431] R13: 00000000004024c0 R14: 0000000000000000 R15: 0000000000000000 [ 82.670948][ T7431] [ 82.673285][ T7431] Allocated by task 7428: [ 82.677616][ T7431] save_stack+0x1b/0x40 [ 82.681762][ T7431] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 82.687380][ T7431] __alloc_skb+0xae/0x550 [ 82.691696][ T7431] netlink_sendmsg+0x94f/0xd90 [ 82.696448][ T7431] sock_sendmsg+0xcf/0x120 [ 82.700880][ T7431] ____sys_sendmsg+0x6e8/0x810 [ 82.705635][ T7431] ___sys_sendmsg+0xf3/0x170 [ 82.710201][ T7431] __sys_sendmsg+0xe5/0x1b0 [ 82.714681][ T7431] do_syscall_64+0x60/0xe0 [ 82.719072][ T7431] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 82.724942][ T7431] [ 82.727263][ T7431] Freed by task 7428: [ 82.731237][ T7431] save_stack+0x1b/0x40 [ 82.735380][ T7431] __kasan_slab_free+0xf5/0x140 [ 82.740206][ T7431] kfree+0x103/0x2c0 [ 82.744079][ T7431] skb_release_data+0x6d9/0x910 [ 82.748910][ T7431] consume_skb+0xc2/0x160 [ 82.753241][ T7431] netlink_unicast+0x53b/0x7d0 [ 82.757983][ T7431] netlink_sendmsg+0x856/0xd90 [ 82.762723][ T7431] sock_sendmsg+0xcf/0x120 [ 82.767125][ T7431] ____sys_sendmsg+0x6e8/0x810 [ 82.771865][ T7431] ___sys_sendmsg+0xf3/0x170 [ 82.776429][ T7431] __sys_sendmsg+0xe5/0x1b0 [ 82.780927][ T7431] do_syscall_64+0x60/0xe0 [ 82.785326][ T7431] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 82.791186][ T7431] [ 82.793493][ T7431] The buggy address belongs to the object at ffff8880a88bf400 [ 82.793493][ T7431] which belongs to the cache kmalloc-512 of size 512 [ 82.807538][ T7431] The buggy address is located 24 bytes inside of [ 82.807538][ T7431] 512-byte region [ffff8880a88bf400, ffff8880a88bf600) [ 82.820699][ T7431] The buggy address belongs to the page: [ 82.826335][ T7431] page:ffffea0002a22fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 82.835427][ T7431] flags: 0xfffe0000000200(slab) [ 82.840259][ T7431] raw: 00fffe0000000200 ffffea00024e6ec8 ffffea0002327488 ffff8880aa000a80 [ 82.848825][ T7431] raw: 0000000000000000 ffff8880a88bf000 0000000100000004 0000000000000000 [ 82.857389][ T7431] page dumped because: kasan: bad access detected [ 82.863793][ T7431] [ 82.866108][ T7431] Memory state around the buggy address: [ 82.871718][ T7431] ffff8880a88bf300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 82.879764][ T7431] ffff8880a88bf380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 82.887816][ T7431] >ffff8880a88bf400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 82.895850][ T7431] ^ [ 82.900686][ T7431] ffff8880a88bf480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 82.908822][ T7431] ffff8880a88bf500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 82.916865][ T7431] ================================================================== [ 82.924905][ T7431] Disabling lock debugging due to kernel taint [ 82.946031][ T7431] Kernel panic - not syncing: panic_on_warn set ... [ 82.952638][ T7431] CPU: 0 PID: 7431 Comm: syz-executor172 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 82.962681][ T7431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.972732][ T7431] Call Trace: [ 82.976021][ T7431] dump_stack+0x18f/0x20d [ 82.980341][ T7431] ? strlen+0x20/0x90 [ 82.984301][ T7431] panic+0x2e3/0x75c [ 82.988173][ T7431] ? __warn_printk+0xf3/0xf3 [ 82.992736][ T7431] ? preempt_schedule_common+0x59/0xc0 [ 82.998169][ T7431] ? strnlen+0x64/0x70 [ 83.002213][ T7431] ? preempt_schedule_thunk+0x16/0x18 [ 83.007560][ T7431] ? trace_hardirqs_on+0x55/0x220 [ 83.012560][ T7431] ? strnlen+0x64/0x70 [ 83.016605][ T7431] ? strnlen+0x64/0x70 [ 83.020649][ T7431] end_report+0x4d/0x53 [ 83.024779][ T7431] kasan_report.cold+0xd/0x37 [ 83.029436][ T7431] ? strnlen+0x64/0x70 [ 83.033480][ T7431] strnlen+0x64/0x70 [ 83.037354][ T7431] netdev_name_node_lookup_rcu+0x22/0x150 [ 83.043099][ T7431] dev_get_by_name+0x7b/0x1e0 [ 83.047762][ T7431] wg_get_device_start+0x2e4/0x3f0 [ 83.052857][ T7431] ? wg_set_device+0x1520/0x1520 [ 83.057782][ T7431] genl_start+0x342/0x6e0 [ 83.062090][ T7431] __netlink_dump_start+0x585/0x900 [ 83.067276][ T7431] ? genl_rcv_msg+0x9e0/0x9e0 [ 83.071953][ T7431] ? wg_get_device_start+0x3f0/0x3f0 [ 83.077233][ T7431] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 83.083046][ T7431] ? genl_rcv+0x40/0x40 [ 83.087187][ T7431] ? mutex_lock_io_nested+0xf60/0xf60 [ 83.092549][ T7431] ? apparmor_capable+0x1d8/0x460 [ 83.097573][ T7431] ? genl_rcv_msg+0x9e0/0x9e0 [ 83.102248][ T7431] ? genl_unlock+0x20/0x20 [ 83.106667][ T7431] ? genl_parallel_done+0x170/0x170 [ 83.111863][ T7431] ? ns_capable+0xde/0x100 [ 83.116286][ T7431] genl_rcv_msg+0x797/0x9e0 [ 83.120808][ T7431] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 83.127734][ T7431] ? lock_acquire+0x1f1/0xad0 [ 83.132395][ T7431] ? genl_rcv+0x15/0x40 [ 83.136546][ T7431] ? lock_release+0x8d0/0x8d0 [ 83.141215][ T7431] netlink_rcv_skb+0x15a/0x430 [ 83.145965][ T7431] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 83.152885][ T7431] ? netlink_ack+0xa10/0xa10 [ 83.157522][ T7431] genl_rcv+0x24/0x40 [ 83.161491][ T7431] netlink_unicast+0x533/0x7d0 [ 83.166243][ T7431] ? netlink_attachskb+0x810/0x810 [ 83.171336][ T7431] ? _copy_from_iter_full+0x247/0x890 [ 83.176685][ T7431] ? __phys_addr+0x9a/0x110 [ 83.181184][ T7431] ? __phys_addr_symbol+0x2c/0x70 [ 83.186194][ T7431] ? __check_object_size+0x171/0x3e4 [ 83.191454][ T7431] netlink_sendmsg+0x856/0xd90 [ 83.196243][ T7431] ? netlink_unicast+0x7d0/0x7d0 [ 83.201161][ T7431] ? netlink_unicast+0x7d0/0x7d0 [ 83.206073][ T7431] sock_sendmsg+0xcf/0x120 [ 83.210510][ T7431] ____sys_sendmsg+0x6e8/0x810 [ 83.215294][ T7431] ? kernel_sendmsg+0x50/0x50 [ 83.219956][ T7431] ? do_recvmmsg+0x6d0/0x6d0 [ 83.224517][ T7431] ? find_held_lock+0x2d/0x110 [ 83.229254][ T7431] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 83.235211][ T7431] ? lock_downgrade+0x820/0x820 [ 83.240049][ T7431] ___sys_sendmsg+0xf3/0x170 [ 83.244614][ T7431] ? sendmsg_copy_msghdr+0x160/0x160 [ 83.249881][ T7431] ? debug_object_active_state+0x260/0x350 [ 83.255660][ T7431] ? lock_downgrade+0x820/0x820 [ 83.260534][ T7431] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 83.266327][ T7431] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 83.272328][ T7431] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 83.278110][ T7431] ? debug_object_active_state+0x260/0x350 [ 83.283900][ T7431] ? trace_hardirqs_off+0x27/0x210 [ 83.289007][ T7431] ? __fget_light+0x215/0x280 [ 83.293661][ T7431] __sys_sendmsg+0xe5/0x1b0 [ 83.298139][ T7431] ? __sys_sendmsg_sock+0xb0/0xb0 [ 83.303141][ T7431] ? check_preemption_disabled+0x38/0x220 [ 83.308857][ T7431] ? do_syscall_64+0x1c/0xe0 [ 83.313420][ T7431] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 83.319384][ T7431] do_syscall_64+0x60/0xe0 [ 83.323794][ T7431] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.329667][ T7431] RIP: 0033:0x445299 [ 83.333529][ T7431] Code: Bad RIP value. [ 83.337564][ T7431] RSP: 002b:00007fff29192cc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 83.345949][ T7431] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445299 [ 83.354012][ T7431] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 [ 83.361958][ T7431] RBP: 0000000000014122 R08: 0000000000000000 R09: 00000000004002e0 [ 83.369905][ T7431] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402430 [ 83.377858][ T7431] R13: 00000000004024c0 R14: 0000000000000000 R15: 0000000000000000 [ 83.387054][ T7431] Kernel Offset: disabled [ 83.391395][ T7431] Rebooting in 86400 seconds..