INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-kasan-gce-386-0,10.128.0.52' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program syzkaller login: [ 29.979694] ================================================================== [ 29.987088] BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x305b/0x3190 [ 29.994243] Read of size 4 at addr ffff8801ce066708 by task syzkaller823974/3020 [ 30.001741] [ 30.003340] CPU: 0 PID: 3020 Comm: syzkaller823974 Not tainted 4.14.0-rc1+ #4 [ 30.010578] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.019904] Call Trace: [ 30.022462] dump_stack+0x194/0x257 [ 30.026062] ? arch_local_irq_restore+0x53/0x53 [ 30.030700] ? show_regs_print_info+0x65/0x65 [ 30.035168] ? lock_release+0xd70/0xd70 [ 30.039112] ? print_usage_bug+0x480/0x480 [ 30.043316] ? xfrm_state_find+0x305b/0x3190 [ 30.047696] print_address_description+0x73/0x250 [ 30.052507] ? xfrm_state_find+0x305b/0x3190 [ 30.056885] kasan_report+0x24e/0x340 [ 30.060659] __asan_report_load4_noabort+0x14/0x20 [ 30.065557] xfrm_state_find+0x305b/0x3190 [ 30.069783] ? xfrm_state_afinfo_get_rcu+0x160/0x160 [ 30.074854] ? print_usage_bug+0x480/0x480 [ 30.079065] ? __lock_acquire+0x732/0x4620 [ 30.083289] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 30.088456] ? __lock_acquire+0x732/0x4620 [ 30.092672] ? __lock_acquire+0x732/0x4620 [ 30.096883] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 30.102053] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 30.107214] ? check_noncircular+0x20/0x20 [ 30.111415] ? check_noncircular+0x20/0x20 [ 30.115630] xfrm_tmpl_resolve+0x2fb/0xbd0 [ 30.119861] ? __xfrm_decode_session+0x100/0x100 [ 30.124593] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.129580] ? fib_table_lookup+0xa07/0x1a30 [ 30.133962] ? check_noncircular+0x20/0x20 [ 30.138179] xfrm_resolve_and_create_bundle+0x186/0x24b0 [ 30.143599] ? inet_netconf_get_devconf+0x4f0/0x4f0 [ 30.148601] ? xfrm_tmpl_resolve+0xbd0/0xbd0 [ 30.152983] ? lock_downgrade+0x990/0x990 [ 30.157108] ? xfrm_selector_match+0xe00/0xe00 [ 30.161661] ? rcu_read_lock_held+0xa9/0xc0 [ 30.165954] ? find_exception+0x3aa/0x520 [ 30.170073] ? lock_release+0xd70/0xd70 [ 30.174022] ? refcount_inc_not_zero+0xfe/0x180 [ 30.178666] ? xfrm_selector_match+0x3b/0xe00 [ 30.183137] ? xfrm_sk_policy_lookup+0x2cf/0x3d0 [ 30.187870] ? xfrm_selector_match+0xe00/0xe00 [ 30.192425] ? check_noncircular+0x20/0x20 [ 30.196627] ? ip_route_output_key_hash_rcu+0x604/0x2c20 [ 30.202051] xfrm_lookup+0xf0a/0x2540 [ 30.205821] ? xfrm_lookup+0xf0a/0x2540 [ 30.209766] ? ip_route_input_noref+0x1e0/0x1e0 [ 30.214411] ? xfrm_policy_lookup_bytype.constprop.49+0x16f0/0x16f0 [ 30.220787] ? find_held_lock+0x39/0x1d0 [ 30.224829] ? lock_downgrade+0x990/0x990 [ 30.228948] ? selinux_netlbl_sock_rcv_skb+0x9e/0x730 [ 30.234111] ? ip_route_output_key_hash+0x1a6/0x370 [ 30.239103] ? lock_release+0xd70/0xd70 [ 30.243045] ? selinux_nf_register+0x30/0x30 [ 30.247421] ? __lock_acquire+0x732/0x4620 [ 30.251632] ? selinux_sock_rcv_skb_compat+0x2f4/0x480 [ 30.256883] ? ip_route_output_key_hash+0x252/0x370 [ 30.261872] ? ip_route_output_key_hash_rcu+0x2c20/0x2c20 [ 30.267386] xfrm_lookup_route+0x39/0x1a0 [ 30.271505] ip_route_output_flow+0x7c/0xa0 [ 30.275797] inet_csk_route_req+0x5d8/0x990 [ 30.280094] tcp_v4_send_synack+0x1e4/0x270 [ 30.284384] ? tcp_v4_send_check+0x90/0x90 [ 30.288596] ? sk_filter_trim_cap+0x12f/0x9b0 [ 30.293062] ? prandom_u32_state+0x13/0x180 [ 30.297387] tcp_rtx_synack+0x119/0x2e0 [ 30.301330] ? tcp_event_new_data_sent+0x2e0/0x2e0 [ 30.306232] ? __lock_is_held+0xbc/0x140 [ 30.310273] inet_rtx_syn_ack+0x64/0xd0 [ 30.314217] tcp_check_req+0xaf5/0x1630 [ 30.318168] ? tcp_openreq_init_rwin+0xae0/0xae0 [ 30.322894] ? refcount_inc_not_zero+0xfe/0x180 [ 30.327533] ? refcount_add+0x60/0x60 [ 30.331304] ? tcp_v4_reqsk_send_ack+0x3e0/0x3e0 [ 30.336032] ? tcp_filter+0x111/0x160 [ 30.339815] tcp_v4_rcv+0x17b0/0x2f20 [ 30.343598] ? lock_acquire+0x1d5/0x580 [ 30.347561] ? tcp_v4_early_demux+0xa30/0xa30 [ 30.352046] ip_local_deliver_finish+0x2e2/0xba0 [ 30.356776] ? inet_del_offload+0x40/0x40 [ 30.360898] ? nf_hook_slow+0xd3/0x1a0 [ 30.364760] ip_local_deliver+0x1ce/0x6e0 [ 30.368881] ? ip_call_ra_chain+0x6d0/0x6d0 [ 30.373182] ? inet_del_offload+0x40/0x40 [ 30.377310] ip_rcv_finish+0x8db/0x19c0 [ 30.381260] ? ip_local_deliver_finish+0xba0/0xba0 [ 30.386158] ? iptable_nat_ipv4_fn+0x40/0x40 [ 30.390536] ? nf_nat_ipv4_in_range+0xf0/0xf0 [ 30.395001] ? ip_rcv+0xba0/0x17d0 [ 30.398511] ? tcp_v4_send_synack+0x270/0x270 [ 30.402976] ? nf_nat_ipv4_in+0x1cd/0x270 [ 30.407097] ? iptable_nat_ipv4_fn+0x40/0x40 [ 30.411482] ? nf_hook_slow+0xd3/0x1a0 [ 30.415345] ip_rcv+0xc3f/0x17d0 [ 30.418686] ? ip_local_deliver+0x6e0/0x6e0 [ 30.422979] ? __lock_acquire+0x732/0x4620 [ 30.427184] ? print_usage_bug+0x480/0x480 [ 30.431401] ? ip_local_deliver_finish+0xba0/0xba0 [ 30.436302] ? ip_local_deliver+0x6e0/0x6e0 [ 30.440598] __netif_receive_skb_core+0x19af/0x33d0 [ 30.445582] ? print_usage_bug+0x480/0x480 [ 30.449806] ? nf_ingress+0x9f0/0x9f0 [ 30.453576] ? kasan_kmalloc+0xad/0xe0 [ 30.457433] ? kmem_cache_alloc+0x12e/0x760 [ 30.461727] ? __build_skb+0x9d/0x450 [ 30.465668] ? build_skb+0x6f/0x260 [ 30.469268] ? tun_build_skb.isra.42+0x92f/0x1690 [ 30.474080] ? tun_get_user+0x1dad/0x2150 [ 30.478195] ? tun_chr_write_iter+0xde/0x190 [ 30.482571] ? __vfs_write+0x68a/0x970 [ 30.486432] ? __skb_flow_get_ports+0x151/0x400 [ 30.491070] ? skb_flow_dissector_init+0x280/0x280 [ 30.495972] ? check_noncircular+0x20/0x20 [ 30.500174] ? __skb_flow_get_ports+0x151/0x400 [ 30.504817] ? __skb_flow_dissect+0x85b/0x3bc0 [ 30.509387] ? find_held_lock+0x39/0x1d0 [ 30.513429] ? lock_downgrade+0x990/0x990 [ 30.517548] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 30.522711] ? lock_acquire+0x1d5/0x580 [ 30.526654] ? netif_receive_skb_internal+0x1d7/0x670 [ 30.531830] ? pvclock_read_flags+0x160/0x160 [ 30.536294] ? tun_build_skb.isra.42+0x455/0x1690 [ 30.541114] ? lock_acquire+0x1d5/0x580 [ 30.545056] ? netif_receive_skb_internal+0xa2/0x670 [ 30.550130] ? ktime_get_with_offset+0x2c1/0x420 [ 30.554858] ? lock_release+0xd70/0xd70 [ 30.558802] ? ktime_get+0x3a0/0x3a0 [ 30.562486] ? skb_put+0x149/0x1c0 [ 30.566005] __netif_receive_skb+0x2c/0x1b0 [ 30.570294] ? __netif_receive_skb+0x2c/0x1b0 [ 30.574761] netif_receive_skb_internal+0x10b/0x670 [ 30.579749] ? dev_cpu_dead+0xb00/0xb00 [ 30.583702] ? rcu_pm_notify+0xc0/0xc0 [ 30.587571] netif_receive_skb+0xae/0x390 [ 30.591690] ? netif_receive_skb_internal+0x670/0x670 [ 30.596855] ? lock_downgrade+0x990/0x990 [ 30.600976] ? tun_rx_batched.isra.43+0x5c3/0x860 [ 30.605790] tun_rx_batched.isra.43+0x5ed/0x860 [ 30.610433] ? skb_get_hash_perturb+0x9d0/0x9d0 [ 30.615071] ? tun_sock_write_space+0x370/0x370 [ 30.619727] tun_get_user+0x11dd/0x2150 [ 30.623685] ? tun_build_skb.isra.42+0x1690/0x1690 [ 30.628585] ? lock_release+0xd70/0xd70 [ 30.632535] ? tun_chr_close+0x60/0x60 [ 30.636400] ? lock_release+0xd70/0xd70 [ 30.640862] ? __lock_is_held+0xbc/0x140 [ 30.644912] ? __tun_get+0x1d4/0x2e0 [ 30.648597] ? tun_chr_close+0x60/0x60 [ 30.652457] ? __handle_mm_fault+0x587/0x39c0 [ 30.656936] tun_chr_write_iter+0xde/0x190 [ 30.661147] __vfs_write+0x68a/0x970 [ 30.664839] ? kernel_read+0x120/0x120 [ 30.668711] ? avc_policy_seqno+0x9/0x20 [ 30.672753] ? selinux_file_permission+0x82/0x460 [ 30.677578] ? rw_verify_area+0xe5/0x2b0 [ 30.681611] ? __fdget_raw+0x20/0x20 [ 30.685301] vfs_write+0x18f/0x510 [ 30.688821] SyS_write+0xef/0x220 [ 30.692251] ? SyS_read+0x220/0x220 [ 30.695858] ? do_fast_syscall_32+0x158/0xeed [ 30.700336] ? SyS_read+0x220/0x220 [ 30.703934] do_fast_syscall_32+0x3f2/0xeed [ 30.708233] ? do_int80_syscall_32+0x930/0x930 [ 30.712793] ? lockdep_sys_exit+0x47/0xf0 [ 30.716925] ? syscall_return_slowpath+0x2b3/0x500 [ 30.721825] ? finish_task_switch+0x1aa/0x740 [ 30.726295] ? lockdep_sys_exit+0x47/0xf0 [ 30.730414] ? retint_user+0x18/0x20 [ 30.734102] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.738919] entry_SYSENTER_compat+0x51/0x60 [ 30.743296] RIP: 0023:0xf7f97c79 [ 30.746631] RSP: 002b:00000000f2f891f4 EFLAGS: 00000292 ORIG_RAX: 0000000000000004 [ 30.754311] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020002000 [ 30.761558] RDX: 0000000000000036 RSI: 0000000000000000 RDI: 00000000003d0f00 [ 30.768796] RBP: 00000000f2f892e8 R08: 0000000000000000 R09: 0000000000000000 [ 30.776037] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 30.783276] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 30.790533] [ 30.792128] The buggy address belongs to the page: [ 30.797028] page:ffffea0007381980 count:0 mapcount:0 mapping: (null) index:0xffff8801ce066e00 [ 30.806445] flags: 0x200000000000000() [ 30.810302] raw: 0200000000000000 0000000000000000 ffff8801ce066e00 00000000ffffffff [ 30.818152] raw: dead000000000100 dead000000000200 ffff8801dac00dc0 0000000000000000 [ 30.826000] page dumped because: kasan: bad access detected [ 30.831677] [ 30.833273] Memory state around the buggy address: [ 30.838169] ffff8801ce066600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.845496] ffff8801ce066680: 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 [ 30.852821] >ffff8801ce066700: 00 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 f1 f1 f1 [ 30.860147] ^ [ 30.863738] ffff8801ce066780: f1 00 00 00 00 00 00 00 00 00 00 00 f2 f3 f3 f3 [ 30.871065] ffff8801ce066800: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.878391] ================================================================== [ 30.885716] Disabling lock debugging due to kernel taint [ 30.891158] Kernel panic - not syncing: panic_on_warn set ... [ 30.891158] [ 30.898494] CPU: 0 PID: 3020 Comm: syzkaller823974 Tainted: G B 4.14.0-rc1+ #4 [ 30.906944] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.916261] Call Trace: [ 30.918812] dump_stack+0x194/0x257 [ 30.922404] ? arch_local_irq_restore+0x53/0x53 [ 30.927041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.931768] ? xfrm_state_find+0x2fc0/0x3190 [ 30.936141] panic+0x1e4/0x417 [ 30.939297] ? __warn+0x1d9/0x1d9 [ 30.942719] ? xfrm_state_find+0x305b/0x3190 [ 30.947089] kasan_end_report+0x50/0x50 [ 30.951024] kasan_report+0x137/0x340 [ 30.954795] __asan_report_load4_noabort+0x14/0x20 [ 30.959687] xfrm_state_find+0x305b/0x3190 [ 30.963897] ? xfrm_state_afinfo_get_rcu+0x160/0x160 [ 30.968963] ? print_usage_bug+0x480/0x480 [ 30.973166] ? __lock_acquire+0x732/0x4620 [ 30.977373] ? debug_check_no_locks_freed+0x3d0/0x3d0