[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.615842] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 23.976650] random: sshd: uninitialized urandom read (32 bytes read) [ 24.174375] random: sshd: uninitialized urandom read (32 bytes read) [ 24.747458] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 112.689176] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 118.402730] random: sshd: uninitialized urandom read (32 bytes read) 2018/09/06 04:49:41 parsed 1 programs [ 119.439976] random: cc1: uninitialized urandom read (8 bytes read) 2018/09/06 04:49:43 executed programs: 0 [ 120.778920] IPVS: ftp: loaded support on port[0] = 21 [ 120.990252] bridge0: port 1(bridge_slave_0) entered blocking state [ 120.996751] bridge0: port 1(bridge_slave_0) entered disabled state [ 121.004593] device bridge_slave_0 entered promiscuous mode [ 121.021816] bridge0: port 2(bridge_slave_1) entered blocking state [ 121.028303] bridge0: port 2(bridge_slave_1) entered disabled state [ 121.035630] device bridge_slave_1 entered promiscuous mode [ 121.051677] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 121.068166] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 121.112718] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 121.131822] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 121.200394] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 121.208045] team0: Port device team_slave_0 added [ 121.223624] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 121.231728] team0: Port device team_slave_1 added [ 121.248179] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 121.266401] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 121.284939] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 121.303132] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 121.429683] bridge0: port 2(bridge_slave_1) entered blocking state [ 121.436169] bridge0: port 2(bridge_slave_1) entered forwarding state [ 121.443137] bridge0: port 1(bridge_slave_0) entered blocking state [ 121.449500] bridge0: port 1(bridge_slave_0) entered forwarding state [ 121.897548] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 121.904618] 8021q: adding VLAN 0 to HW filter on device bond0 [ 121.950109] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 121.958488] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 121.997462] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 122.003670] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 122.010932] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 122.050466] 8021q: adding VLAN 0 to HW filter on device team0 [ 122.338421] ================================================================== [ 122.346020] BUG: KASAN: use-after-free in sock_i_ino+0x94/0xa0 [ 122.351976] Read of size 8 at addr ffff8801bb6e55b0 by task syz-executor0/4938 [ 122.359311] [ 122.360923] CPU: 0 PID: 4938 Comm: syz-executor0 Not tainted 4.19.0-rc2+ #223 [ 122.368172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 122.377514] Call Trace: [ 122.380093] dump_stack+0x1c9/0x2b4 [ 122.383705] ? dump_stack_print_info.cold.2+0x52/0x52 [ 122.388878] ? printk+0xa7/0xcf [ 122.392190] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 122.396939] ? sock_i_ino+0x94/0xa0 [ 122.400553] print_address_description+0x6c/0x20b [ 122.405378] ? sock_i_ino+0x94/0xa0 [ 122.408985] kasan_report.cold.7+0x242/0x30d [ 122.413379] __asan_report_load8_noabort+0x14/0x20 [ 122.418304] sock_i_ino+0x94/0xa0 [ 122.421758] tipc_sk_fill_sock_diag+0x3be/0xdb0 [ 122.426406] ? tipc_diag_dump+0x30/0x30 [ 122.430372] ? tipc_getname+0x7f0/0x7f0 [ 122.434332] ? print_usage_bug+0xc0/0xc0 [ 122.438448] ? graph_lock+0x170/0x170 [ 122.442236] ? __lock_sock+0x203/0x360 [ 122.446107] ? find_held_lock+0x36/0x1c0 [ 122.450155] ? mark_held_locks+0xc9/0x160 [ 122.454287] ? __local_bh_enable_ip+0x161/0x230 [ 122.458938] ? __local_bh_enable_ip+0x161/0x230 [ 122.463737] ? lockdep_hardirqs_on+0x421/0x5c0 [ 122.468305] ? trace_hardirqs_on+0xbd/0x2c0 [ 122.472606] ? lock_release+0x9f0/0x9f0 [ 122.476559] ? lock_sock_nested+0xe7/0x120 [ 122.480774] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 122.485772] ? skb_put+0x17b/0x1e0 [ 122.489366] ? memset+0x31/0x40 [ 122.492647] ? __nlmsg_put+0x14c/0x1b0 [ 122.496518] __tipc_add_sock_diag+0x22f/0x360 [ 122.500999] tipc_nl_sk_walk+0x122/0x1d0 [ 122.505044] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 122.510307] tipc_diag_dump+0x24/0x30 [ 122.514092] netlink_dump+0x519/0xd50 [ 122.517875] ? netlink_broadcast+0x50/0x50 [ 122.522097] __netlink_dump_start+0x4f1/0x6f0 [ 122.526578] ? kasan_check_read+0x11/0x20 [ 122.530713] ? tipc_data_ready+0x3f0/0x3f0 [ 122.534928] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 122.540013] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 122.544661] ? tipc_data_ready+0x3f0/0x3f0 [ 122.548872] ? tipc_unregister_sysctl+0x20/0x20 [ 122.553525] ? tipc_ioctl+0x3b0/0x3b0 [ 122.557309] ? netlink_deliver_tap+0x356/0xfb0 [ 122.561872] sock_diag_rcv_msg+0x31d/0x410 [ 122.566098] netlink_rcv_skb+0x172/0x440 [ 122.570210] ? sock_diag_bind+0x80/0x80 [ 122.574174] ? netlink_ack+0xbe0/0xbe0 [ 122.578042] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 122.582701] sock_diag_rcv+0x2a/0x40 [ 122.586395] netlink_unicast+0x5a0/0x760 [ 122.590442] ? netlink_attachskb+0x9a0/0x9a0 [ 122.594847] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 122.600375] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 122.605379] netlink_sendmsg+0xa18/0xfc0 [ 122.609426] ? netlink_unicast+0x760/0x760 [ 122.613643] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 122.618554] ? apparmor_socket_sendmsg+0x29/0x30 [ 122.623294] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 122.628826] ? security_socket_sendmsg+0x94/0xc0 [ 122.633558] ? netlink_unicast+0x760/0x760 [ 122.637775] sock_sendmsg+0xd5/0x120 [ 122.641553] ___sys_sendmsg+0x7fd/0x930 [ 122.645521] ? copy_msghdr_from_user+0x580/0x580 [ 122.650261] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 122.655347] ? do_raw_spin_unlock+0xa7/0x2f0 [ 122.659740] ? __fget_light+0x2f7/0x440 [ 122.663703] ? __local_bh_enable_ip+0x161/0x230 [ 122.668358] ? fget_raw+0x20/0x20 [ 122.671805] ? __fget_light+0x2f7/0x440 [ 122.675765] ? fget_raw+0x20/0x20 [ 122.679199] ? tipc_nametbl_build_group+0x279/0x360 [ 122.684216] ? tipc_setsockopt+0x726/0xd70 [ 122.688440] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 122.693958] ? sockfd_lookup_light+0xc5/0x160 [ 122.698434] __sys_sendmsg+0x11d/0x290 [ 122.702306] ? __ia32_sys_shutdown+0x80/0x80 [ 122.706701] ? __x64_sys_futex+0x47f/0x6a0 [ 122.710916] ? do_syscall_64+0x9a/0x820 [ 122.714870] ? do_syscall_64+0x9a/0x820 [ 122.718828] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 122.723915] __x64_sys_sendmsg+0x78/0xb0 [ 122.727957] do_syscall_64+0x1b9/0x820 [ 122.731829] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 122.737173] ? syscall_return_slowpath+0x5e0/0x5e0 [ 122.742084] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 122.746906] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 122.751914] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 122.756922] ? prepare_exit_to_usermode+0x291/0x3b0 [ 122.761922] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 122.766750] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 122.771920] RIP: 0033:0x457099 [ 122.775094] Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 122.794100] RSP: 002b:00007f238c36bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 122.801791] RAX: ffffffffffffffda RBX: 00007f238c36c6d4 RCX: 0000000000457099 [ 122.809042] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 [ 122.816337] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 122.823584] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 122.830834] R13: 00000000004d4bc0 R14: 00000000004c910b R15: 0000000000000000 [ 122.838120] [ 122.839773] Allocated by task 4938: [ 122.843390] save_stack+0x43/0xd0 [ 122.846871] kasan_kmalloc+0xc4/0xe0 [ 122.850570] kasan_slab_alloc+0x12/0x20 [ 122.854540] kmem_cache_alloc+0x12e/0x710 [ 122.858668] sock_alloc_inode+0x1d/0x260 [ 122.862708] alloc_inode+0x63/0x190 [ 122.866315] new_inode_pseudo+0x71/0x1a0 [ 122.870357] sock_alloc+0x41/0x270 [ 122.873893] __sock_create+0x175/0x940 [ 122.877762] __sys_socket+0x106/0x260 [ 122.881547] __x64_sys_socket+0x73/0xb0 [ 122.885502] do_syscall_64+0x1b9/0x820 [ 122.889372] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 122.894536] [ 122.896143] Freed by task 4937: [ 122.899403] save_stack+0x43/0xd0 [ 122.902837] __kasan_slab_free+0x11a/0x170 [ 122.907066] kasan_slab_free+0xe/0x10 [ 122.910870] kmem_cache_free+0x86/0x280 [ 122.914822] sock_destroy_inode+0x51/0x60 [ 122.918948] destroy_inode+0x159/0x200 [ 122.922810] evict+0x5d5/0x990 [ 122.925979] iput+0x5fa/0xa00 [ 122.929072] dentry_unlink_inode+0x461/0x5e0 [ 122.933468] __dentry_kill+0x44c/0x7a0 [ 122.937337] dentry_kill+0xc9/0x5a0 [ 122.940940] dput.part.26+0x66b/0x7a0 [ 122.944726] dput+0x15/0x20 [ 122.947640] __fput+0x4d4/0xa40 [ 122.950898] ____fput+0x15/0x20 [ 122.954205] task_work_run+0x1e8/0x2a0 [ 122.958092] exit_to_usermode_loop+0x318/0x380 [ 122.962654] do_syscall_64+0x6be/0x820 [ 122.966522] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 122.971686] [ 122.973294] The buggy address belongs to the object at ffff8801bb6e5540 [ 122.973294] which belongs to the cache sock_inode_cache(17:syz0) of size 984 [ 122.987145] The buggy address is located 112 bytes inside of [ 122.987145] 984-byte region [ffff8801bb6e5540, ffff8801bb6e5918) [ 122.999027] The buggy address belongs to the page: [ 123.003962] page:ffffea0006edb940 count:1 mapcount:0 mapping:ffff8801ce1c67c0 index:0xffff8801bb6e5ffd [ 123.013405] flags: 0x2fffc0000000100(slab) [ 123.017621] raw: 02fffc0000000100 ffffea0006c8df48 ffffea0006c8d788 ffff8801ce1c67c0 [ 123.025483] raw: ffff8801bb6e5ffd ffff8801bb6e50c0 0000000100000003 ffff8801b418c940 [ 123.033339] page dumped because: kasan: bad access detected [ 123.039024] page->mem_cgroup:ffff8801b418c940 [ 123.043493] [ 123.045104] Memory state around the buggy address: [ 123.050099] ffff8801bb6e5480: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc [ 123.057450] ffff8801bb6e5500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 123.064790] >ffff8801bb6e5580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 123.072355] ^ [ 123.077266] ffff8801bb6e5600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 123.084737] ffff8801bb6e5680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 123.092086] ================================================================== [ 123.099542] Disabling lock debugging due to kernel taint [ 123.105092] Kernel panic - not syncing: panic_on_warn set ... [ 123.105092] [ 123.112444] CPU: 0 PID: 4938 Comm: syz-executor0 Tainted: G B 4.19.0-rc2+ #223 [ 123.121139] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 123.130475] Call Trace: [ 123.133045] dump_stack+0x1c9/0x2b4 [ 123.136661] ? dump_stack_print_info.cold.2+0x52/0x52 [ 123.141876] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 123.146623] panic+0x238/0x4e7 [ 123.149799] ? add_taint.cold.5+0x16/0x16 [ 123.153942] ? trace_hardirqs_on+0xb4/0x2c0 [ 123.158240] ? trace_hardirqs_on+0x9a/0x2c0 [ 123.162545] ? sock_i_ino+0x94/0xa0 [ 123.166152] kasan_end_report+0x47/0x4f [ 123.170104] kasan_report.cold.7+0x76/0x30d [ 123.174405] __asan_report_load8_noabort+0x14/0x20 [ 123.179469] sock_i_ino+0x94/0xa0 [ 123.182912] tipc_sk_fill_sock_diag+0x3be/0xdb0 [ 123.187559] ? tipc_diag_dump+0x30/0x30 [ 123.191513] ? tipc_getname+0x7f0/0x7f0 [ 123.195465] ? print_usage_bug+0xc0/0xc0 [ 123.199504] ? graph_lock+0x170/0x170 [ 123.203282] ? __lock_sock+0x203/0x360 [ 123.207147] ? find_held_lock+0x36/0x1c0 [ 123.211185] ? mark_held_locks+0xc9/0x160 [ 123.215312] ? __local_bh_enable_ip+0x161/0x230 [ 123.219962] ? __local_bh_enable_ip+0x161/0x230 [ 123.224625] ? lockdep_hardirqs_on+0x421/0x5c0 [ 123.229191] ? trace_hardirqs_on+0xbd/0x2c0 [ 123.233500] ? lock_release+0x9f0/0x9f0 [ 123.237507] ? lock_sock_nested+0xe7/0x120 [ 123.241738] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 123.246733] ? skb_put+0x17b/0x1e0 [ 123.250254] ? memset+0x31/0x40 [ 123.253512] ? __nlmsg_put+0x14c/0x1b0 [ 123.257379] __tipc_add_sock_diag+0x22f/0x360 [ 123.261854] tipc_nl_sk_walk+0x122/0x1d0 [ 123.265896] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 123.271187] tipc_diag_dump+0x24/0x30 [ 123.274968] netlink_dump+0x519/0xd50 [ 123.278746] ? netlink_broadcast+0x50/0x50 [ 123.282968] __netlink_dump_start+0x4f1/0x6f0 [ 123.287444] ? kasan_check_read+0x11/0x20 [ 123.291571] ? tipc_data_ready+0x3f0/0x3f0 [ 123.295788] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 123.300909] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 123.305562] ? tipc_data_ready+0x3f0/0x3f0 [ 123.309808] ? tipc_unregister_sysctl+0x20/0x20 [ 123.314459] ? tipc_ioctl+0x3b0/0x3b0 [ 123.318246] ? netlink_deliver_tap+0x356/0xfb0 [ 123.322824] sock_diag_rcv_msg+0x31d/0x410 [ 123.327048] netlink_rcv_skb+0x172/0x440 [ 123.331098] ? sock_diag_bind+0x80/0x80 [ 123.335076] ? netlink_ack+0xbe0/0xbe0 [ 123.338947] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 123.343600] sock_diag_rcv+0x2a/0x40 [ 123.347296] netlink_unicast+0x5a0/0x760 [ 123.351353] ? netlink_attachskb+0x9a0/0x9a0 [ 123.355749] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 123.361271] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 123.366270] netlink_sendmsg+0xa18/0xfc0 [ 123.370338] ? netlink_unicast+0x760/0x760 [ 123.374565] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 123.379485] ? apparmor_socket_sendmsg+0x29/0x30 [ 123.384228] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 123.389767] ? security_socket_sendmsg+0x94/0xc0 [ 123.394506] ? netlink_unicast+0x760/0x760 [ 123.398725] sock_sendmsg+0xd5/0x120 [ 123.402424] ___sys_sendmsg+0x7fd/0x930 [ 123.406384] ? copy_msghdr_from_user+0x580/0x580 [ 123.411141] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 123.416238] ? do_raw_spin_unlock+0xa7/0x2f0 [ 123.420634] ? __fget_light+0x2f7/0x440 [ 123.424592] ? __local_bh_enable_ip+0x161/0x230 [ 123.429244] ? fget_raw+0x20/0x20 [ 123.432679] ? __fget_light+0x2f7/0x440 [ 123.436639] ? fget_raw+0x20/0x20 [ 123.440086] ? tipc_nametbl_build_group+0x279/0x360 [ 123.445087] ? tipc_setsockopt+0x726/0xd70 [ 123.449311] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 123.454852] ? sockfd_lookup_light+0xc5/0x160 [ 123.459343] __sys_sendmsg+0x11d/0x290 [ 123.463230] ? __ia32_sys_shutdown+0x80/0x80 [ 123.467626] ? __x64_sys_futex+0x47f/0x6a0 [ 123.471846] ? do_syscall_64+0x9a/0x820 [ 123.475802] ? do_syscall_64+0x9a/0x820 [ 123.479799] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 123.484889] __x64_sys_sendmsg+0x78/0xb0 [ 123.488933] do_syscall_64+0x1b9/0x820 [ 123.492805] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 123.498150] ? syscall_return_slowpath+0x5e0/0x5e0 [ 123.503068] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 123.507910] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 123.512908] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 123.517908] ? prepare_exit_to_usermode+0x291/0x3b0 [ 123.522907] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 123.527735] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 123.532908] RIP: 0033:0x457099 [ 123.536101] Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 123.554994] RSP: 002b:00007f238c36bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 123.562686] RAX: ffffffffffffffda RBX: 00007f238c36c6d4 RCX: 0000000000457099 [ 123.569953] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 [ 123.577223] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 123.584936] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 123.592186] R13: 00000000004d4bc0 R14: 00000000004c910b R15: 0000000000000000 [ 123.599839] Dumping ftrace buffer: [ 123.603367] (ftrace buffer empty) [ 123.607300] Kernel Offset: disabled [ 123.610908] Rebooting in 86400 seconds..