[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.939791] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.734401] random: sshd: uninitialized urandom read (32 bytes read) [ 26.091774] random: sshd: uninitialized urandom read (32 bytes read) [ 26.644859] random: sshd: uninitialized urandom read (32 bytes read) [ 75.226833] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 80.800512] random: sshd: uninitialized urandom read (32 bytes read) 2018/09/10 21:03:45 parsed 1 programs [ 82.034135] random: cc1: uninitialized urandom read (8 bytes read) 2018/09/10 21:03:47 executed programs: 0 [ 83.143956] IPVS: ftp: loaded support on port[0] = 21 [ 83.354910] bridge0: port 1(bridge_slave_0) entered blocking state [ 83.361409] bridge0: port 1(bridge_slave_0) entered disabled state [ 83.368961] device bridge_slave_0 entered promiscuous mode [ 83.386327] bridge0: port 2(bridge_slave_1) entered blocking state [ 83.392704] bridge0: port 2(bridge_slave_1) entered disabled state [ 83.399972] device bridge_slave_1 entered promiscuous mode [ 83.416197] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 83.432306] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 83.475480] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 83.494475] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 83.560291] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 83.567546] team0: Port device team_slave_0 added [ 83.582487] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 83.589569] team0: Port device team_slave_1 added [ 83.605051] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 83.623810] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 83.642524] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 83.661322] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 83.789274] bridge0: port 2(bridge_slave_1) entered blocking state [ 83.795727] bridge0: port 2(bridge_slave_1) entered forwarding state [ 83.802663] bridge0: port 1(bridge_slave_0) entered blocking state [ 83.809034] bridge0: port 1(bridge_slave_0) entered forwarding state [ 84.257266] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 84.263394] 8021q: adding VLAN 0 to HW filter on device bond0 [ 84.309037] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 84.321525] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 84.360342] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 84.366682] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 84.373842] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 84.418189] 8021q: adding VLAN 0 to HW filter on device team0 [ 84.805602] ================================================================== [ 84.813113] BUG: KASAN: use-after-free in sock_i_ino+0x94/0xa0 [ 84.819072] Read of size 8 at addr ffff8801b74d1070 by task syz-executor0/4584 [ 84.826410] [ 84.828026] CPU: 0 PID: 4584 Comm: syz-executor0 Not tainted 4.19.0-rc2-next-20180904+ #55 [ 84.836413] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.845752] Call Trace: [ 84.848363] dump_stack+0x1c9/0x2b4 [ 84.851983] ? dump_stack_print_info.cold.2+0x52/0x52 [ 84.857161] ? printk+0xa7/0xcf [ 84.860446] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 84.865196] ? sock_i_ino+0x94/0xa0 [ 84.868813] print_address_description+0x6c/0x20b [ 84.873657] ? sock_i_ino+0x94/0xa0 [ 84.877345] kasan_report.cold.7+0x242/0x30d [ 84.881749] __asan_report_load8_noabort+0x14/0x20 [ 84.886674] sock_i_ino+0x94/0xa0 [ 84.890126] tipc_sk_fill_sock_diag+0x3be/0xdb0 [ 84.894782] ? tipc_diag_dump+0x30/0x30 [ 84.898753] ? tipc_getname+0x7f0/0x7f0 [ 84.902719] ? print_usage_bug+0xc0/0xc0 [ 84.906773] ? graph_lock+0x170/0x170 [ 84.910574] ? __lock_sock+0x203/0x360 [ 84.914468] ? find_held_lock+0x36/0x1c0 [ 84.918518] ? mark_held_locks+0xc9/0x160 [ 84.922669] ? __local_bh_enable_ip+0x161/0x230 [ 84.927346] ? __local_bh_enable_ip+0x161/0x230 [ 84.932003] ? lockdep_hardirqs_on+0x421/0x5c0 [ 84.936570] ? trace_hardirqs_on+0xbd/0x2c0 [ 84.940930] ? lock_release+0x9f0/0x9f0 [ 84.944898] ? lock_sock_nested+0xe7/0x120 [ 84.949124] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 84.954130] ? skb_put+0x17b/0x1e0 [ 84.957678] ? memset+0x31/0x40 [ 84.960965] ? __nlmsg_put+0x14c/0x1b0 [ 84.964859] __tipc_add_sock_diag+0x22f/0x360 [ 84.969345] tipc_nl_sk_walk+0x122/0x1d0 [ 84.973403] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 84.978688] tipc_diag_dump+0x24/0x30 [ 84.982478] netlink_dump+0x519/0xd50 [ 84.986268] ? netlink_broadcast+0x50/0x50 [ 84.990492] __netlink_dump_start+0x4f1/0x6f0 [ 84.994973] ? kasan_check_read+0x11/0x20 [ 84.999119] ? tipc_data_ready+0x3f0/0x3f0 [ 85.003348] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 85.008438] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 85.013094] ? tipc_data_ready+0x3f0/0x3f0 [ 85.017371] ? tipc_unregister_sysctl+0x20/0x20 [ 85.022033] ? tipc_ioctl+0x3b0/0x3b0 [ 85.025824] ? netlink_deliver_tap+0x356/0xfb0 [ 85.030399] sock_diag_rcv_msg+0x31d/0x410 [ 85.034641] netlink_rcv_skb+0x172/0x440 [ 85.038703] ? sock_diag_bind+0x80/0x80 [ 85.042681] ? netlink_ack+0xbe0/0xbe0 [ 85.046559] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 85.051247] sock_diag_rcv+0x2a/0x40 [ 85.054957] netlink_unicast+0x5a0/0x760 [ 85.059029] ? netlink_attachskb+0x9a0/0x9a0 [ 85.063445] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.068996] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 85.074016] netlink_sendmsg+0xa18/0xfc0 [ 85.078154] ? netlink_unicast+0x760/0x760 [ 85.082750] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 85.087673] ? apparmor_socket_sendmsg+0x29/0x30 [ 85.092420] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.097949] ? security_socket_sendmsg+0x94/0xc0 [ 85.102772] ? netlink_unicast+0x760/0x760 [ 85.107007] sock_sendmsg+0xd5/0x120 [ 85.110717] ___sys_sendmsg+0x7fd/0x930 [ 85.114686] ? copy_msghdr_from_user+0x580/0x580 [ 85.119431] ? _raw_spin_unlock_bh+0x30/0x40 [ 85.123827] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 85.128919] ? do_raw_spin_unlock+0xa7/0x2f0 [ 85.133316] ? __release_sock+0x276/0x3a0 [ 85.137470] ? __fget_light+0x2f7/0x440 [ 85.141449] ? __local_bh_enable_ip+0x161/0x230 [ 85.146107] ? fget_raw+0x20/0x20 [ 85.149558] ? __release_sock+0x3a0/0x3a0 [ 85.153698] ? tipc_nametbl_build_group+0x279/0x360 [ 85.158719] ? tipc_setsockopt+0x726/0xd70 [ 85.162951] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 85.168473] ? sockfd_lookup_light+0xc5/0x160 [ 85.172954] __sys_sendmsg+0x11d/0x290 [ 85.176830] ? __ia32_sys_shutdown+0x80/0x80 [ 85.181224] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 85.186754] ? fput+0x130/0x1a0 [ 85.190023] ? __x64_sys_futex+0x47f/0x6a0 [ 85.194253] ? do_syscall_64+0x9a/0x820 [ 85.198219] ? do_syscall_64+0x9a/0x820 [ 85.202185] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 85.207280] __x64_sys_sendmsg+0x78/0xb0 [ 85.211330] do_syscall_64+0x1b9/0x820 [ 85.215203] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 85.220558] ? syscall_return_slowpath+0x5e0/0x5e0 [ 85.225476] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 85.230480] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 85.235481] ? recalc_sigpending_tsk+0x180/0x180 [ 85.240225] ? kasan_check_write+0x14/0x20 [ 85.244453] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 85.249289] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.254462] RIP: 0033:0x4572a9 [ 85.257650] 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 [ 85.276595] RSP: 002b:00007f71c316cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 85.284312] RAX: ffffffffffffffda RBX: 00007f71c316d6d4 RCX: 00000000004572a9 [ 85.291570] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 [ 85.298884] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 85.306143] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 85.313400] R13: 00000000004d4e40 R14: 00000000004c9389 R15: 0000000000000000 [ 85.320674] [ 85.322287] Allocated by task 4584: [ 85.325903] save_stack+0x43/0xd0 [ 85.329344] kasan_kmalloc+0xc4/0xe0 [ 85.333067] kasan_slab_alloc+0x12/0x20 [ 85.337027] kmem_cache_alloc+0x12e/0x710 [ 85.341165] sock_alloc_inode+0x1d/0x260 [ 85.345218] alloc_inode+0x63/0x190 [ 85.348839] new_inode_pseudo+0x71/0x1a0 [ 85.352885] sock_alloc+0x41/0x270 [ 85.356409] __sock_create+0x175/0x940 [ 85.360287] __sys_socket+0x106/0x260 [ 85.364077] __x64_sys_socket+0x73/0xb0 [ 85.368043] do_syscall_64+0x1b9/0x820 [ 85.371925] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.377099] [ 85.378774] Freed by task 4583: [ 85.382046] save_stack+0x43/0xd0 [ 85.385526] __kasan_slab_free+0x11a/0x170 [ 85.389877] kasan_slab_free+0xe/0x10 [ 85.393671] kmem_cache_free+0x86/0x280 [ 85.397643] sock_destroy_inode+0x51/0x60 [ 85.401787] destroy_inode+0x159/0x200 [ 85.405667] evict+0x5d5/0x990 [ 85.408855] iput+0x5fa/0xa00 [ 85.411971] dentry_unlink_inode+0x461/0x5e0 [ 85.416381] __dentry_kill+0x44c/0x7a0 [ 85.420265] dentry_kill+0xc9/0x5a0 [ 85.423890] dput.part.26+0x66b/0x7a0 [ 85.427687] dput+0x15/0x20 [ 85.430610] __fput+0x505/0xa80 [ 85.433886] ____fput+0x15/0x20 [ 85.437205] task_work_run+0x1e8/0x2a0 [ 85.441090] exit_to_usermode_loop+0x318/0x380 [ 85.445668] do_syscall_64+0x6be/0x820 [ 85.449766] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.455004] [ 85.456633] The buggy address belongs to the object at ffff8801b74d1000 [ 85.456633] which belongs to the cache sock_inode_cache(17:syz0) of size 984 [ 85.470514] The buggy address is located 112 bytes inside of [ 85.470514] 984-byte region [ffff8801b74d1000, ffff8801b74d13d8) [ 85.482373] The buggy address belongs to the page: [ 85.487288] page:ffffea0006dd3440 count:1 mapcount:0 mapping:ffff8801bc7e9d80 index:0xffff8801b74d1ffd [ 85.496718] flags: 0x2fffc0000000100(slab) [ 85.500940] raw: 02fffc0000000100 ffffea0006dd2648 ffffea0006dd2688 ffff8801bc7e9d80 [ 85.508809] raw: ffff8801b74d1ffd ffff8801b74d1000 0000000100000003 ffff8801c4682680 [ 85.516689] page dumped because: kasan: bad access detected [ 85.522389] page->mem_cgroup:ffff8801c4682680 [ 85.526861] [ 85.528471] Memory state around the buggy address: [ 85.533387] ffff8801b74d0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 85.540742] ffff8801b74d0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 85.548088] >ffff8801b74d1000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.555429] ^ [ 85.562427] ffff8801b74d1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.569770] ffff8801b74d1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.577110] ================================================================== [ 85.584453] Disabling lock debugging due to kernel taint [ 85.589949] Kernel panic - not syncing: panic_on_warn set ... [ 85.589949] [ 85.597326] CPU: 0 PID: 4584 Comm: syz-executor0 Tainted: G B 4.19.0-rc2-next-20180904+ #55 [ 85.607113] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.616447] Call Trace: [ 85.619021] dump_stack+0x1c9/0x2b4 [ 85.622644] ? dump_stack_print_info.cold.2+0x52/0x52 [ 85.627833] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 85.632575] panic+0x238/0x4e7 [ 85.635759] ? add_taint.cold.5+0x16/0x16 [ 85.639893] ? trace_hardirqs_on+0xb4/0x2c0 [ 85.644196] ? trace_hardirqs_on+0x9a/0x2c0 [ 85.648501] ? sock_i_ino+0x94/0xa0 [ 85.652114] kasan_end_report+0x47/0x4f [ 85.656072] kasan_report.cold.7+0x76/0x30d [ 85.660383] __asan_report_load8_noabort+0x14/0x20 [ 85.665305] sock_i_ino+0x94/0xa0 [ 85.668761] tipc_sk_fill_sock_diag+0x3be/0xdb0 [ 85.673416] ? tipc_diag_dump+0x30/0x30 [ 85.677401] ? tipc_getname+0x7f0/0x7f0 [ 85.681361] ? print_usage_bug+0xc0/0xc0 [ 85.685404] ? graph_lock+0x170/0x170 [ 85.689191] ? __lock_sock+0x203/0x360 [ 85.693063] ? find_held_lock+0x36/0x1c0 [ 85.697109] ? mark_held_locks+0xc9/0x160 [ 85.701244] ? __local_bh_enable_ip+0x161/0x230 [ 85.705897] ? __local_bh_enable_ip+0x161/0x230 [ 85.710553] ? lockdep_hardirqs_on+0x421/0x5c0 [ 85.715120] ? trace_hardirqs_on+0xbd/0x2c0 [ 85.719425] ? lock_release+0x9f0/0x9f0 [ 85.723384] ? lock_sock_nested+0xe7/0x120 [ 85.727625] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 85.732646] ? skb_put+0x17b/0x1e0 [ 85.736177] ? memset+0x31/0x40 [ 85.739444] ? __nlmsg_put+0x14c/0x1b0 [ 85.743320] __tipc_add_sock_diag+0x22f/0x360 [ 85.747799] tipc_nl_sk_walk+0x122/0x1d0 [ 85.751846] ? tipc_sock_diag_handler_dump+0x3d0/0x3d0 [ 85.757108] tipc_diag_dump+0x24/0x30 [ 85.760893] netlink_dump+0x519/0xd50 [ 85.764684] ? netlink_broadcast+0x50/0x50 [ 85.768905] __netlink_dump_start+0x4f1/0x6f0 [ 85.773386] ? kasan_check_read+0x11/0x20 [ 85.777516] ? tipc_data_ready+0x3f0/0x3f0 [ 85.781751] tipc_sock_diag_handler_dump+0x28e/0x3d0 [ 85.786840] ? __tipc_diag_gen_cookie+0xc0/0xc0 [ 85.791498] ? tipc_data_ready+0x3f0/0x3f0 [ 85.795717] ? tipc_unregister_sysctl+0x20/0x20 [ 85.800368] ? tipc_ioctl+0x3b0/0x3b0 [ 85.804155] ? netlink_deliver_tap+0x356/0xfb0 [ 85.808724] sock_diag_rcv_msg+0x31d/0x410 [ 85.812946] netlink_rcv_skb+0x172/0x440 [ 85.816992] ? sock_diag_bind+0x80/0x80 [ 85.820961] ? netlink_ack+0xbe0/0xbe0 [ 85.824835] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 85.829492] sock_diag_rcv+0x2a/0x40 [ 85.833189] netlink_unicast+0x5a0/0x760 [ 85.837236] ? netlink_attachskb+0x9a0/0x9a0 [ 85.841641] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.847170] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 85.852191] netlink_sendmsg+0xa18/0xfc0 [ 85.856253] ? netlink_unicast+0x760/0x760 [ 85.860473] ? aa_sock_msg_perm.isra.13+0xba/0x160 [ 85.865391] ? apparmor_socket_sendmsg+0x29/0x30 [ 85.870148] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.875674] ? security_socket_sendmsg+0x94/0xc0 [ 85.880413] ? netlink_unicast+0x760/0x760 [ 85.884656] sock_sendmsg+0xd5/0x120 [ 85.888363] ___sys_sendmsg+0x7fd/0x930 [ 85.892341] ? copy_msghdr_from_user+0x580/0x580 [ 85.897087] ? _raw_spin_unlock_bh+0x30/0x40 [ 85.901482] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 85.906573] ? do_raw_spin_unlock+0xa7/0x2f0 [ 85.910970] ? __release_sock+0x276/0x3a0 [ 85.915106] ? __fget_light+0x2f7/0x440 [ 85.919064] ? __local_bh_enable_ip+0x161/0x230 [ 85.923718] ? fget_raw+0x20/0x20 [ 85.927156] ? __release_sock+0x3a0/0x3a0 [ 85.931293] ? tipc_nametbl_build_group+0x279/0x360 [ 85.936294] ? tipc_setsockopt+0x726/0xd70 [ 85.940623] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 85.946163] ? sockfd_lookup_light+0xc5/0x160 [ 85.950653] __sys_sendmsg+0x11d/0x290 [ 85.954537] ? __ia32_sys_shutdown+0x80/0x80 [ 85.958931] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 85.964453] ? fput+0x130/0x1a0 [ 85.967718] ? __x64_sys_futex+0x47f/0x6a0 [ 85.971937] ? do_syscall_64+0x9a/0x820 [ 85.975895] ? do_syscall_64+0x9a/0x820 [ 85.979855] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 85.984944] __x64_sys_sendmsg+0x78/0xb0 [ 85.988989] do_syscall_64+0x1b9/0x820 [ 85.992868] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 85.998216] ? syscall_return_slowpath+0x5e0/0x5e0 [ 86.003138] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 86.008145] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 86.013146] ? recalc_sigpending_tsk+0x180/0x180 [ 86.017888] ? kasan_check_write+0x14/0x20 [ 86.022111] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 86.026942] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.032116] RIP: 0033:0x4572a9 [ 86.035293] 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 [ 86.054179] RSP: 002b:00007f71c316cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 86.061874] RAX: ffffffffffffffda RBX: 00007f71c316d6d4 RCX: 00000000004572a9 [ 86.069146] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 [ 86.076398] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 86.083653] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 86.091157] R13: 00000000004d4e40 R14: 00000000004c9389 R15: 0000000000000000 [ 86.098720] Dumping ftrace buffer: [ 86.102247] (ftrace buffer empty) [ 86.105940] Kernel Offset: disabled [ 86.109547] Rebooting in 86400 seconds..