[....] Starting OpenBSD Secure Shell server: sshd[ 22.432929] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.641932] random: sshd: uninitialized urandom read (32 bytes read) [ 24.906101] random: sshd: uninitialized urandom read (32 bytes read) [ 25.459738] random: sshd: uninitialized urandom read (32 bytes read) [ 107.384625] random: sshd: uninitialized urandom read (32 bytes read) [ 107.503570] sshd (4642) used greatest stack depth: 16872 bytes left Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 112.929407] random: sshd: uninitialized urandom read (32 bytes read) 2018/09/02 09:51:55 parsed 1 programs [ 114.032186] random: cc1: uninitialized urandom read (8 bytes read) 2018/09/02 09:51:57 executed programs: 0 [ 114.906183] IPVS: ftp: loaded support on port[0] = 21 [ 115.115722] bridge0: port 1(bridge_slave_0) entered blocking state [ 115.122179] bridge0: port 1(bridge_slave_0) entered disabled state [ 115.129590] device bridge_slave_0 entered promiscuous mode [ 115.146074] bridge0: port 2(bridge_slave_1) entered blocking state [ 115.152432] bridge0: port 2(bridge_slave_1) entered disabled state [ 115.159590] device bridge_slave_1 entered promiscuous mode [ 115.175220] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 115.191711] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 115.235129] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 115.254446] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 115.319251] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 115.326494] team0: Port device team_slave_0 added [ 115.341168] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 115.348265] team0: Port device team_slave_1 added [ 115.363358] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 115.383052] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 115.400240] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 115.418370] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 115.543109] bridge0: port 2(bridge_slave_1) entered blocking state [ 115.549660] bridge0: port 2(bridge_slave_1) entered forwarding state [ 115.556555] bridge0: port 1(bridge_slave_0) entered blocking state [ 115.562929] bridge0: port 1(bridge_slave_0) entered forwarding state [ 116.004615] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 116.010717] 8021q: adding VLAN 0 to HW filter on device bond0 [ 116.056940] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 116.079527] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 116.108461] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 116.114639] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 116.121722] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 116.164736] 8021q: adding VLAN 0 to HW filter on device team0 [ 116.514850] ================================================================== [ 116.522339] BUG: KASAN: use-after-free in sock_i_ino+0x94/0xa0 [ 116.528300] Read of size 8 at addr ffff8801b3704170 by task syz-executor0/4935 [ 116.535647] [ 116.537262] CPU: 0 PID: 4935 Comm: syz-executor0 Not tainted 4.19.0-rc1-next-20180831+ #53 [ 116.545641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 116.555031] Call Trace: [ 116.557610] dump_stack+0x1c9/0x2b4 [ 116.561224] ? dump_stack_print_info.cold.2+0x52/0x52 [ 116.566398] ? printk+0xa7/0xcf [ 116.569666] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 116.574411] ? sock_i_ino+0x94/0xa0 [ 116.578026] print_address_description+0x6c/0x20b [ 116.582869] ? sock_i_ino+0x94/0xa0 [ 116.586491] kasan_report.cold.7+0x242/0x30d [ 116.590897] __asan_report_load8_noabort+0x14/0x20 [ 116.595831] sock_i_ino+0x94/0xa0 [ 116.599282] tipc_sk_fill_sock_diag+0x3be/0xdb0 [ 116.603944] ? tipc_diag_dump+0x30/0x30 [ 116.607917] ? tipc_getname+0x7f0/0x7f0 [ 116.611880] ? print_usage_bug+0xc0/0xc0 [ 116.615936] ? graph_lock+0x170/0x170 [ 116.619720] ? __lock_sock+0x203/0x360 [ 116.623596] ? find_held_lock+0x36/0x1c0 [ 116.627642] ? mark_held_locks+0xc9/0x160 [ 116.631785] ? __local_bh_enable_ip+0x161/0x230 [ 116.636460] ? __local_bh_enable_ip+0x161/0x230 [ 116.641116] ? lockdep_hardirqs_on+0x421/0x5c0 [ 116.645683] ? trace_hardirqs_on+0xbd/0x2c0 [ 116.649990] ? lock_release+0x9f0/0x9f0 [ 116.653961] ? lock_sock_nested+0xe7/0x120 [ 116.658194] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 116.663195] ? skb_put+0x17b/0x1e0 [ 116.666720] ? memset+0x31/0x40 [ 116.669985] ? __nlmsg_put+0x14c/0x1b0 [ 116.673879] __tipc_add_sock_diag+0x22f/0x360 [ 116.678382] tipc_nl_sk_walk+0x122/0x1d0 [ 116.682443] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 116.687703] tipc_diag_dump+0x24/0x30 [ 116.691487] netlink_dump+0x519/0xd50 [ 116.695273] ? netlink_broadcast+0x50/0x50 [ 116.699510] __netlink_dump_start+0x4f1/0x6f0 [ 116.703998] ? kasan_check_read+0x11/0x20 [ 116.708130] ? tipc_data_ready+0x3f0/0x3f0 [ 116.712356] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 116.717462] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 116.722129] ? tipc_data_ready+0x3f0/0x3f0 [ 116.726350] ? tipc_unregister_sysctl+0x20/0x20 [ 116.731012] ? tipc_ioctl+0x3b0/0x3b0 [ 116.734825] ? netlink_deliver_tap+0x356/0xfb0 [ 116.739409] sock_diag_rcv_msg+0x31d/0x410 [ 116.743631] netlink_rcv_skb+0x172/0x440 [ 116.747678] ? sock_diag_bind+0x80/0x80 [ 116.751640] ? netlink_ack+0xbe0/0xbe0 [ 116.755511] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 116.760905] sock_diag_rcv+0x2a/0x40 [ 116.764605] netlink_unicast+0x5a0/0x760 [ 116.768654] ? netlink_attachskb+0x9a0/0x9a0 [ 116.773085] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 116.778608] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 116.783627] netlink_sendmsg+0xa18/0xfc0 [ 116.787690] ? netlink_unicast+0x760/0x760 [ 116.791913] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 116.796853] ? apparmor_socket_sendmsg+0x29/0x30 [ 116.801598] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 116.807125] ? security_socket_sendmsg+0x94/0xc0 [ 116.811875] ? netlink_unicast+0x760/0x760 [ 116.816093] sock_sendmsg+0xd5/0x120 [ 116.819791] ___sys_sendmsg+0x7fd/0x930 [ 116.823780] ? copy_msghdr_from_user+0x580/0x580 [ 116.828529] ? _raw_spin_unlock_bh+0x30/0x40 [ 116.832925] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 116.838017] ? do_raw_spin_unlock+0xa7/0x2f0 [ 116.842416] ? __fget_light+0x2f7/0x440 [ 116.846385] ? __local_bh_enable_ip+0x161/0x230 [ 116.851074] ? fget_raw+0x20/0x20 [ 116.854516] ? __release_sock+0x3a0/0x3a0 [ 116.858654] ? tipc_nametbl_build_group+0x279/0x360 [ 116.863658] ? tipc_setsockopt+0x726/0xd70 [ 116.867892] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 116.873414] ? sockfd_lookup_light+0xc5/0x160 [ 116.877907] __sys_sendmsg+0x11d/0x290 [ 116.881782] ? __ia32_sys_shutdown+0x80/0x80 [ 116.886183] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 116.891702] ? fput+0x130/0x1a0 [ 116.894968] ? __x64_sys_futex+0x47f/0x6a0 [ 116.899186] ? do_syscall_64+0x9a/0x820 [ 116.903146] ? do_syscall_64+0x9a/0x820 [ 116.907122] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 116.912213] __x64_sys_sendmsg+0x78/0xb0 [ 116.916260] do_syscall_64+0x1b9/0x820 [ 116.920153] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 116.925513] ? syscall_return_slowpath+0x5e0/0x5e0 [ 116.930438] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 116.935445] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 116.940448] ? recalc_sigpending_tsk+0x180/0x180 [ 116.945187] ? kasan_check_write+0x14/0x20 [ 116.949433] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 116.954267] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 116.959441] RIP: 0033:0x457099 [ 116.962635] 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 [ 116.981520] RSP: 002b:00007ff1792a8c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 116.989211] RAX: ffffffffffffffda RBX: 00007ff1792a96d4 RCX: 0000000000457099 [ 116.996464] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 [ 117.003716] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 117.010966] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 117.018215] R13: 00000000004d4860 R14: 00000000004c8ebd R15: 0000000000000000 [ 117.025475] [ 117.027097] Allocated by task 4935: [ 117.030708] save_stack+0x43/0xd0 [ 117.034143] kasan_kmalloc+0xc4/0xe0 [ 117.037869] kasan_slab_alloc+0x12/0x20 [ 117.041863] kmem_cache_alloc+0x12e/0x710 [ 117.046005] sock_alloc_inode+0x1d/0x260 [ 117.050049] alloc_inode+0x63/0x190 [ 117.053666] new_inode_pseudo+0x71/0x1a0 [ 117.057724] sock_alloc+0x41/0x270 [ 117.061247] __sock_create+0x175/0x940 [ 117.065117] __sys_socket+0x106/0x260 [ 117.068902] __x64_sys_socket+0x73/0xb0 [ 117.072863] do_syscall_64+0x1b9/0x820 [ 117.076735] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 117.081902] [ 117.083518] Freed by task 4934: [ 117.086780] save_stack+0x43/0xd0 [ 117.090319] __kasan_slab_free+0x11a/0x170 [ 117.094549] kasan_slab_free+0xe/0x10 [ 117.098332] kmem_cache_free+0x86/0x280 [ 117.102290] sock_destroy_inode+0x51/0x60 [ 117.106423] destroy_inode+0x159/0x200 [ 117.110296] evict+0x5d5/0x990 [ 117.113471] iput+0x5fa/0xa00 [ 117.116569] dentry_unlink_inode+0x461/0x5e0 [ 117.120975] __dentry_kill+0x44c/0x7a0 [ 117.124859] dentry_kill+0xc9/0x5a0 [ 117.128469] dput.part.26+0x66b/0x7a0 [ 117.132252] dput+0x15/0x20 [ 117.135169] __fput+0x505/0xa80 [ 117.138431] ____fput+0x15/0x20 [ 117.141693] task_work_run+0x1e8/0x2a0 [ 117.145568] exit_to_usermode_loop+0x318/0x380 [ 117.150134] do_syscall_64+0x6be/0x820 [ 117.154007] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 117.159172] [ 117.160781] The buggy address belongs to the object at ffff8801b3704100 [ 117.160781] which belongs to the cache sock_inode_cache(17:syz0) of size 984 [ 117.174652] The buggy address is located 112 bytes inside of [ 117.174652] 984-byte region [ffff8801b3704100, ffff8801b37044d8) [ 117.186512] The buggy address belongs to the page: [ 117.191438] page:ffffea0006cdc100 count:1 mapcount:0 mapping:ffff8801cbccb240 index:0xffff8801b3704ffd [ 117.200871] flags: 0x2fffc0000000100(slab) [ 117.205107] raw: 02fffc0000000100 ffffea0006cdc088 ffffea0006cdc248 ffff8801cbccb240 [ 117.212979] raw: ffff8801b3704ffd ffff8801b3704100 0000000100000003 ffff8801b6710280 [ 117.220857] page dumped because: kasan: bad access detected [ 117.226553] page->mem_cgroup:ffff8801b6710280 [ 117.231034] [ 117.232650] Memory state around the buggy address: [ 117.237559] ffff8801b3704000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 117.244902] ffff8801b3704080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 117.252243] >ffff8801b3704100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 117.259582] ^ [ 117.266579] ffff8801b3704180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 117.273919] ffff8801b3704200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 117.281274] ================================================================== [ 117.288612] Disabling lock debugging due to kernel taint [ 117.294083] Kernel panic - not syncing: panic_on_warn set ... [ 117.294083] [ 117.301453] CPU: 0 PID: 4935 Comm: syz-executor0 Tainted: G B 4.19.0-rc1-next-20180831+ #53 [ 117.311243] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 117.320583] Call Trace: [ 117.323154] dump_stack+0x1c9/0x2b4 [ 117.326768] ? dump_stack_print_info.cold.2+0x52/0x52 [ 117.331948] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 117.336690] panic+0x238/0x4e7 [ 117.339866] ? add_taint.cold.5+0x16/0x16 [ 117.343998] ? trace_hardirqs_on+0xb4/0x2c0 [ 117.348302] ? trace_hardirqs_on+0x9a/0x2c0 [ 117.352607] ? sock_i_ino+0x94/0xa0 [ 117.356249] kasan_end_report+0x47/0x4f [ 117.360214] kasan_report.cold.7+0x76/0x30d [ 117.364520] __asan_report_load8_noabort+0x14/0x20 [ 117.369435] sock_i_ino+0x94/0xa0 [ 117.372878] tipc_sk_fill_sock_diag+0x3be/0xdb0 [ 117.377549] ? tipc_diag_dump+0x30/0x30 [ 117.381513] ? tipc_getname+0x7f0/0x7f0 [ 117.385479] ? print_usage_bug+0xc0/0xc0 [ 117.389521] ? graph_lock+0x170/0x170 [ 117.393304] ? __lock_sock+0x203/0x360 [ 117.397174] ? find_held_lock+0x36/0x1c0 [ 117.401216] ? mark_held_locks+0xc9/0x160 [ 117.405347] ? __local_bh_enable_ip+0x161/0x230 [ 117.409998] ? __local_bh_enable_ip+0x161/0x230 [ 117.414661] ? lockdep_hardirqs_on+0x421/0x5c0 [ 117.419226] ? trace_hardirqs_on+0xbd/0x2c0 [ 117.423530] ? lock_release+0x9f0/0x9f0 [ 117.427489] ? lock_sock_nested+0xe7/0x120 [ 117.431726] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 117.436725] ? skb_put+0x17b/0x1e0 [ 117.440256] ? memset+0x31/0x40 [ 117.443533] ? __nlmsg_put+0x14c/0x1b0 [ 117.447411] __tipc_add_sock_diag+0x22f/0x360 [ 117.451891] tipc_nl_sk_walk+0x122/0x1d0 [ 117.455940] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 117.461198] tipc_diag_dump+0x24/0x30 [ 117.464985] netlink_dump+0x519/0xd50 [ 117.468769] ? netlink_broadcast+0x50/0x50 [ 117.472994] __netlink_dump_start+0x4f1/0x6f0 [ 117.477489] ? kasan_check_read+0x11/0x20 [ 117.481628] ? tipc_data_ready+0x3f0/0x3f0 [ 117.485862] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 117.490961] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 117.495610] ? tipc_data_ready+0x3f0/0x3f0 [ 117.499843] ? tipc_unregister_sysctl+0x20/0x20 [ 117.504495] ? tipc_ioctl+0x3b0/0x3b0 [ 117.508286] ? netlink_deliver_tap+0x356/0xfb0 [ 117.512869] sock_diag_rcv_msg+0x31d/0x410 [ 117.517091] netlink_rcv_skb+0x172/0x440 [ 117.521135] ? sock_diag_bind+0x80/0x80 [ 117.525090] ? netlink_ack+0xbe0/0xbe0 [ 117.528960] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 117.533615] sock_diag_rcv+0x2a/0x40 [ 117.537310] netlink_unicast+0x5a0/0x760 [ 117.541356] ? netlink_attachskb+0x9a0/0x9a0 [ 117.545749] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 117.551271] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 117.556271] netlink_sendmsg+0xa18/0xfc0 [ 117.560318] ? netlink_unicast+0x760/0x760 [ 117.564541] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 117.569451] ? apparmor_socket_sendmsg+0x29/0x30 [ 117.574189] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 117.579709] ? security_socket_sendmsg+0x94/0xc0 [ 117.584448] ? netlink_unicast+0x760/0x760 [ 117.588665] sock_sendmsg+0xd5/0x120 [ 117.592364] ___sys_sendmsg+0x7fd/0x930 [ 117.596325] ? copy_msghdr_from_user+0x580/0x580 [ 117.601069] ? _raw_spin_unlock_bh+0x30/0x40 [ 117.605464] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 117.610549] ? do_raw_spin_unlock+0xa7/0x2f0 [ 117.614946] ? __fget_light+0x2f7/0x440 [ 117.618903] ? __local_bh_enable_ip+0x161/0x230 [ 117.623553] ? fget_raw+0x20/0x20 [ 117.626999] ? __release_sock+0x3a0/0x3a0 [ 117.631132] ? tipc_nametbl_build_group+0x279/0x360 [ 117.636134] ? tipc_setsockopt+0x726/0xd70 [ 117.640354] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 117.645880] ? sockfd_lookup_light+0xc5/0x160 [ 117.650378] __sys_sendmsg+0x11d/0x290 [ 117.654254] ? __ia32_sys_shutdown+0x80/0x80 [ 117.658647] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 117.664164] ? fput+0x130/0x1a0 [ 117.667430] ? __x64_sys_futex+0x47f/0x6a0 [ 117.671646] ? do_syscall_64+0x9a/0x820 [ 117.675602] ? do_syscall_64+0x9a/0x820 [ 117.679558] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 117.684652] __x64_sys_sendmsg+0x78/0xb0 [ 117.688695] do_syscall_64+0x1b9/0x820 [ 117.692565] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 117.697913] ? syscall_return_slowpath+0x5e0/0x5e0 [ 117.702846] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 117.707857] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 117.712862] ? recalc_sigpending_tsk+0x180/0x180 [ 117.717599] ? kasan_check_write+0x14/0x20 [ 117.721842] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 117.726685] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 117.731860] RIP: 0033:0x457099 [ 117.735035] 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 [ 117.753919] RSP: 002b:00007ff1792a8c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 117.761607] RAX: ffffffffffffffda RBX: 00007ff1792a96d4 RCX: 0000000000457099 [ 117.768860] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 [ 117.776117] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 117.783394] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 117.790643] R13: 00000000004d4860 R14: 00000000004c8ebd R15: 0000000000000000 [ 117.798352] Dumping ftrace buffer: [ 117.801880] (ftrace buffer empty) [ 117.805568] Kernel Offset: disabled [ 117.809177] Rebooting in 86400 seconds..