[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 25.718172] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.278372] random: sshd: uninitialized urandom read (32 bytes read) [ 29.596165] random: sshd: uninitialized urandom read (32 bytes read) [ 30.201503] random: sshd: uninitialized urandom read (32 bytes read) [ 34.535552] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 40.053813] random: sshd: uninitialized urandom read (32 bytes read) 2018/09/08 13:58:08 parsed 1 programs [ 41.750847] random: cc1: uninitialized urandom read (8 bytes read) 2018/09/08 13:58:10 executed programs: 0 [ 43.169252] IPVS: ftp: loaded support on port[0] = 21 [ 43.417931] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.424865] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.432185] device bridge_slave_0 entered promiscuous mode [ 43.450918] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.457315] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.464544] device bridge_slave_1 entered promiscuous mode [ 43.482947] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 43.500505] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 43.551106] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.571629] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.646625] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 43.654249] team0: Port device team_slave_0 added [ 43.670543] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 43.678680] team0: Port device team_slave_1 added [ 43.695894] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 43.719066] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 43.738677] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 43.760719] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 43.903838] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.910318] bridge0: port 2(bridge_slave_1) entered forwarding state [ 43.917089] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.923514] bridge0: port 1(bridge_slave_0) entered forwarding state [ 44.425324] 8021q: adding VLAN 0 to HW filter on device bond0 [ 44.476582] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 44.525210] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 44.531611] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 44.538706] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 44.591756] 8021q: adding VLAN 0 to HW filter on device team0 [ 44.906362] ================================================================== [ 44.913861] BUG: KASAN: use-after-free in sock_i_ino+0x94/0xa0 [ 44.919832] Read of size 8 at addr ffff8801c53a65b0 by task syz-executor0/5639 [ 44.927178] [ 44.928801] CPU: 0 PID: 5639 Comm: syz-executor0 Not tainted 4.19.0-rc2+ #130 [ 44.936063] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.945414] Call Trace: [ 44.948004] dump_stack+0x1c4/0x2b4 [ 44.951765] ? dump_stack_print_info.cold.2+0x52/0x52 [ 44.956952] ? printk+0xa7/0xcf [ 44.960238] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 44.965056] print_address_description.cold.8+0x9/0x1ff [ 44.970422] kasan_report.cold.9+0x242/0x309 [ 44.974819] ? sock_i_ino+0x94/0xa0 [ 44.978436] __asan_report_load8_noabort+0x14/0x20 [ 44.983362] sock_i_ino+0x94/0xa0 [ 44.986811] tipc_sk_fill_sock_diag+0x39c/0xd90 [ 44.991477] ? tipc_diag_dump+0x30/0x30 [ 44.995549] ? tipc_getname+0x7f0/0x7f0 [ 44.999524] ? graph_lock+0x170/0x170 [ 45.003318] ? __lock_sock+0x203/0x350 [ 45.007208] ? find_held_lock+0x36/0x1c0 [ 45.011272] ? mark_held_locks+0xc7/0x130 [ 45.015414] ? __local_bh_enable_ip+0x160/0x260 [ 45.020110] ? __local_bh_enable_ip+0x160/0x260 [ 45.024797] ? lockdep_hardirqs_on+0x421/0x5c0 [ 45.029383] ? trace_hardirqs_on+0xbd/0x310 [ 45.033714] ? lock_release+0x970/0x970 [ 45.037686] ? lock_sock_nested+0xe2/0x120 [ 45.041919] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.046926] ? skb_put+0x17b/0x1e0 [ 45.050451] ? memset+0x31/0x40 [ 45.053721] ? __nlmsg_put+0x14c/0x1b0 [ 45.057609] __tipc_add_sock_diag+0x233/0x360 [ 45.062454] tipc_nl_sk_walk+0x122/0x1d0 [ 45.066526] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 45.071811] tipc_diag_dump+0x24/0x30 [ 45.075662] netlink_dump+0x519/0xd50 [ 45.079475] ? netlink_broadcast+0x50/0x50 [ 45.083722] __netlink_dump_start+0x4f1/0x6f0 [ 45.088225] ? tipc_data_ready+0x3e0/0x3e0 [ 45.092466] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 45.097569] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 45.102496] ? tipc_data_ready+0x3e0/0x3e0 [ 45.106954] ? tipc_unregister_sysctl+0x20/0x20 [ 45.111642] ? tipc_ioctl+0x3a0/0x3a0 [ 45.115448] ? netlink_deliver_tap+0x355/0xf80 [ 45.120086] sock_diag_rcv_msg+0x31d/0x410 [ 45.124525] netlink_rcv_skb+0x172/0x440 [ 45.128598] ? sock_diag_bind+0x80/0x80 [ 45.132621] ? netlink_ack+0xb80/0xb80 [ 45.136520] sock_diag_rcv+0x2a/0x40 [ 45.140227] netlink_unicast+0x5a5/0x760 [ 45.144283] ? netlink_attachskb+0x9a0/0x9a0 [ 45.148697] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.154238] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.159262] netlink_sendmsg+0xa18/0xfc0 [ 45.163329] ? move_addr_to_kernel.part.18+0xc6/0x100 [ 45.168525] ? netlink_unicast+0x760/0x760 [ 45.172760] ? aa_sock_msg_perm.isra.12+0xba/0x160 [ 45.177768] ? apparmor_socket_sendmsg+0x29/0x30 [ 45.182596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.188152] ? security_socket_sendmsg+0x94/0xc0 [ 45.192936] ? netlink_unicast+0x760/0x760 [ 45.197180] sock_sendmsg+0xd5/0x120 [ 45.200902] ___sys_sendmsg+0x7fd/0x930 [ 45.204987] ? __local_bh_enable_ip+0x160/0x260 [ 45.209663] ? copy_msghdr_from_user+0x580/0x580 [ 45.214429] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 45.219895] ? release_sock+0x1ec/0x2c0 [ 45.223877] ? __fget_light+0x2e9/0x430 [ 45.227852] ? fget_raw+0x20/0x20 [ 45.231316] ? __release_sock+0x3a0/0x3a0 [ 45.235577] ? tipc_nametbl_build_group+0x273/0x360 [ 45.240619] ? tipc_setsockopt+0x726/0xd70 [ 45.244873] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.250428] ? sockfd_lookup_light+0xc5/0x160 [ 45.254937] __sys_sendmsg+0x11d/0x280 [ 45.258887] ? __ia32_sys_shutdown+0x80/0x80 [ 45.263315] ? do_fast_syscall_32+0x150/0xfb2 [ 45.267995] ? do_fast_syscall_32+0x150/0xfb2 [ 45.272509] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 45.277982] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 45.282754] do_fast_syscall_32+0x34d/0xfb2 [ 45.287095] ? do_int80_syscall_32+0x890/0x890 [ 45.292218] ? entry_SYSENTER_compat+0x68/0x7f [ 45.296826] ? trace_hardirqs_off_caller+0xbb/0x310 [ 45.301856] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.306709] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.311740] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.316766] ? recalc_sigpending_tsk+0x180/0x180 [ 45.321615] ? kasan_check_write+0x14/0x20 [ 45.325858] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.330721] entry_SYSENTER_compat+0x70/0x7f [ 45.335132] RIP: 0023:0xf7f52ca9 [ 45.338497] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 45.357403] RSP: 002b:00000000f7f4e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 [ 45.365123] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000020000040 [ 45.372397] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 45.379676] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 45.387133] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 45.394538] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 45.401825] [ 45.403448] Allocated by task 5639: [ 45.407070] save_stack+0x43/0xd0 [ 45.410512] kasan_kmalloc+0xc7/0xe0 [ 45.414221] kasan_slab_alloc+0x12/0x20 [ 45.418196] kmem_cache_alloc+0x12e/0x730 [ 45.422506] sock_alloc_inode+0x1d/0x260 [ 45.426748] alloc_inode+0x63/0x190 [ 45.430386] new_inode_pseudo+0x71/0x1a0 [ 45.434451] sock_alloc+0x41/0x270 [ 45.437993] __sock_create+0x175/0x930 [ 45.441975] __sys_socket+0x106/0x260 [ 45.445783] __ia32_sys_socket+0x73/0xb0 [ 45.449904] do_fast_syscall_32+0x34d/0xfb2 [ 45.454235] entry_SYSENTER_compat+0x70/0x7f [ 45.458626] [ 45.460241] Freed by task 5638: [ 45.463525] save_stack+0x43/0xd0 [ 45.467033] __kasan_slab_free+0x102/0x150 [ 45.471292] kasan_slab_free+0xe/0x10 [ 45.475094] kmem_cache_free+0x83/0x290 [ 45.479468] sock_destroy_inode+0x51/0x60 [ 45.483601] destroy_inode+0x159/0x200 [ 45.487476] evict+0x5e0/0x980 [ 45.490666] iput+0x679/0xa90 [ 45.493755] dentry_unlink_inode+0x461/0x5e0 [ 45.498145] __dentry_kill+0x44c/0x7a0 [ 45.502020] dentry_kill+0xc9/0x5a0 [ 45.505703] dput.part.26+0x660/0x790 [ 45.509508] dput+0x15/0x20 [ 45.512439] __fput+0x4cf/0xa30 [ 45.515713] ____fput+0x15/0x20 [ 45.518984] task_work_run+0x1e8/0x2a0 [ 45.522854] exit_to_usermode_loop+0x318/0x380 [ 45.527419] do_fast_syscall_32+0xcd5/0xfb2 [ 45.531993] entry_SYSENTER_compat+0x70/0x7f [ 45.536385] [ 45.537999] The buggy address belongs to the object at ffff8801c53a6540 [ 45.537999] which belongs to the cache sock_inode_cache(17:syz0) of size 984 [ 45.551866] The buggy address is located 112 bytes inside of [ 45.551866] 984-byte region [ffff8801c53a6540, ffff8801c53a6918) [ 45.563733] The buggy address belongs to the page: [ 45.568664] page:ffffea000714e980 count:1 mapcount:0 mapping:ffff8801bd897e00 index:0xffff8801c53a6ffd [ 45.578111] flags: 0x2fffc0000000100(slab) [ 45.582340] raw: 02fffc0000000100 ffffea000714f548 ffffea0006cc0908 ffff8801bd897e00 [ 45.590216] raw: ffff8801c53a6ffd ffff8801c53a60c0 0000000100000003 ffff8801cecec800 [ 45.598147] page dumped because: kasan: bad access detected [ 45.604096] page->mem_cgroup:ffff8801cecec800 [ 45.608598] [ 45.610206] Memory state around the buggy address: [ 45.615132] ffff8801c53a6480: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.622483] ffff8801c53a6500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 45.629887] >ffff8801c53a6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.637294] ^ [ 45.642224] ffff8801c53a6600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.649589] ffff8801c53a6680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.656950] ================================================================== [ 45.664303] Disabling lock debugging due to kernel taint [ 45.669845] Kernel panic - not syncing: panic_on_warn set ... [ 45.669845] [ 45.677205] CPU: 0 PID: 5639 Comm: syz-executor0 Tainted: G B 4.19.0-rc2+ #130 [ 45.685946] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.695291] Call Trace: [ 45.697874] dump_stack+0x1c4/0x2b4 [ 45.701494] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.706694] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 45.711450] panic+0x238/0x4e7 [ 45.714637] ? add_taint.cold.5+0x16/0x16 [ 45.718777] ? trace_hardirqs_on+0x9a/0x310 [ 45.723093] ? trace_hardirqs_on+0xb4/0x310 [ 45.727404] ? trace_hardirqs_on+0xb4/0x310 [ 45.731719] kasan_end_report+0x47/0x4f [ 45.735806] kasan_report.cold.9+0x76/0x309 [ 45.740125] ? sock_i_ino+0x94/0xa0 [ 45.743741] __asan_report_load8_noabort+0x14/0x20 [ 45.748743] sock_i_ino+0x94/0xa0 [ 45.752195] tipc_sk_fill_sock_diag+0x39c/0xd90 [ 45.756849] ? tipc_diag_dump+0x30/0x30 [ 45.760812] ? tipc_getname+0x7f0/0x7f0 [ 45.764778] ? graph_lock+0x170/0x170 [ 45.768578] ? __lock_sock+0x203/0x350 [ 45.772456] ? find_held_lock+0x36/0x1c0 [ 45.776510] ? mark_held_locks+0xc7/0x130 [ 45.780660] ? __local_bh_enable_ip+0x160/0x260 [ 45.785335] ? __local_bh_enable_ip+0x160/0x260 [ 45.790005] ? lockdep_hardirqs_on+0x421/0x5c0 [ 45.794602] ? trace_hardirqs_on+0xbd/0x310 [ 45.798920] ? lock_release+0x970/0x970 [ 45.802924] ? lock_sock_nested+0xe2/0x120 [ 45.807155] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.812156] ? skb_put+0x17b/0x1e0 [ 45.815693] ? memset+0x31/0x40 [ 45.818959] ? __nlmsg_put+0x14c/0x1b0 [ 45.822834] __tipc_add_sock_diag+0x233/0x360 [ 45.827321] tipc_nl_sk_walk+0x122/0x1d0 [ 45.831391] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 45.836656] tipc_diag_dump+0x24/0x30 [ 45.840462] netlink_dump+0x519/0xd50 [ 45.844256] ? netlink_broadcast+0x50/0x50 [ 45.848479] __netlink_dump_start+0x4f1/0x6f0 [ 45.852975] ? tipc_data_ready+0x3e0/0x3e0 [ 45.857197] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 45.862568] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 45.867239] ? tipc_data_ready+0x3e0/0x3e0 [ 45.871475] ? tipc_unregister_sysctl+0x20/0x20 [ 45.876130] ? tipc_ioctl+0x3a0/0x3a0 [ 45.879919] ? netlink_deliver_tap+0x355/0xf80 [ 45.884490] sock_diag_rcv_msg+0x31d/0x410 [ 45.888738] netlink_rcv_skb+0x172/0x440 [ 45.892793] ? sock_diag_bind+0x80/0x80 [ 45.896772] ? netlink_ack+0xb80/0xb80 [ 45.900669] sock_diag_rcv+0x2a/0x40 [ 45.904370] netlink_unicast+0x5a5/0x760 [ 45.908439] ? netlink_attachskb+0x9a0/0x9a0 [ 45.912834] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.918530] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.923554] netlink_sendmsg+0xa18/0xfc0 [ 45.927625] ? move_addr_to_kernel.part.18+0xc6/0x100 [ 45.932804] ? netlink_unicast+0x760/0x760 [ 45.937043] ? aa_sock_msg_perm.isra.12+0xba/0x160 [ 45.941958] ? apparmor_socket_sendmsg+0x29/0x30 [ 45.946697] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.952219] ? security_socket_sendmsg+0x94/0xc0 [ 45.956961] ? netlink_unicast+0x760/0x760 [ 45.961184] sock_sendmsg+0xd5/0x120 [ 45.964881] ___sys_sendmsg+0x7fd/0x930 [ 45.968841] ? __local_bh_enable_ip+0x160/0x260 [ 45.973496] ? copy_msghdr_from_user+0x580/0x580 [ 45.978237] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 45.983679] ? release_sock+0x1ec/0x2c0 [ 45.987639] ? __fget_light+0x2e9/0x430 [ 45.991618] ? fget_raw+0x20/0x20 [ 45.995065] ? __release_sock+0x3a0/0x3a0 [ 45.999211] ? tipc_nametbl_build_group+0x273/0x360 [ 46.004213] ? tipc_setsockopt+0x726/0xd70 [ 46.008435] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 46.013978] ? sockfd_lookup_light+0xc5/0x160 [ 46.018460] __sys_sendmsg+0x11d/0x280 [ 46.022336] ? __ia32_sys_shutdown+0x80/0x80 [ 46.026735] ? do_fast_syscall_32+0x150/0xfb2 [ 46.031215] ? do_fast_syscall_32+0x150/0xfb2 [ 46.035699] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 46.041137] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 46.045883] do_fast_syscall_32+0x34d/0xfb2 [ 46.050200] ? do_int80_syscall_32+0x890/0x890 [ 46.054804] ? entry_SYSENTER_compat+0x68/0x7f [ 46.059372] ? trace_hardirqs_off_caller+0xbb/0x310 [ 46.064371] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.069198] ? trace_hardirqs_on_caller+0x310/0x310 [ 46.074199] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 46.079234] ? recalc_sigpending_tsk+0x180/0x180 [ 46.083987] ? kasan_check_write+0x14/0x20 [ 46.088208] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.093057] entry_SYSENTER_compat+0x70/0x7f [ 46.097448] RIP: 0023:0xf7f52ca9 [ 46.100822] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 46.119722] RSP: 002b:00000000f7f4e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 [ 46.127417] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000020000040 [ 46.134669] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 46.141924] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 46.149186] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 46.156438] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 46.164005] Dumping ftrace buffer: [ 46.167541] (ftrace buffer empty) [ 46.171767] Kernel Offset: disabled [ 46.175400] Rebooting in 86400 seconds..