INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-mmots-kasan-gce-5,10.128.0.52' (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: [ 41.583346] ================================================================== [ 41.590746] BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x305b/0x3190 [ 41.597909] Read of size 4 at addr ffff8801cd676898 by task syzkaller067636/3017 [ 41.605412] [ 41.607014] CPU: 0 PID: 3017 Comm: syzkaller067636 Not tainted 4.13.0-mm1+ #5 [ 41.614254] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.623583] Call Trace: [ 41.626148] dump_stack+0x194/0x257 [ 41.629753] ? arch_local_irq_restore+0x53/0x53 [ 41.634393] ? show_regs_print_info+0x65/0x65 [ 41.638862] ? lock_release+0xd70/0xd70 [ 41.642808] ? xfrm_state_find+0x305b/0x3190 [ 41.647188] print_address_description+0x73/0x250 [ 41.652009] ? xfrm_state_find+0x305b/0x3190 [ 41.656389] kasan_report+0x24e/0x340 [ 41.660167] __asan_report_load4_noabort+0x14/0x20 [ 41.665065] xfrm_state_find+0x305b/0x3190 [ 41.669296] ? xfrm_state_afinfo_get_rcu+0x160/0x160 [ 41.674370] ? ip_route_output_key_hash+0x20b/0x370 [ 41.679357] ? check_noncircular+0x20/0x20 [ 41.683563] ? find_held_lock+0x39/0x1d0 [ 41.687599] ? check_noncircular+0x20/0x20 [ 41.691812] ? lock_downgrade+0x990/0x990 [ 41.695935] ? find_held_lock+0x39/0x1d0 [ 41.699989] ? __lock_acquire+0x732/0x4620 [ 41.704191] ? find_held_lock+0x39/0x1d0 [ 41.708237] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 41.713400] ? depot_save_stack+0x1c2/0x490 [ 41.717693] ? unwind_dump+0x4c0/0x4c0 [ 41.721555] ? do_raw_spin_trylock+0x190/0x190 [ 41.726122] xfrm_tmpl_resolve+0x2fb/0xbd0 [ 41.730343] ? __xfrm_decode_session+0x100/0x100 [ 41.735067] ? save_stack_trace+0x16/0x20 [ 41.739184] ? save_stack+0x43/0xd0 [ 41.742779] ? kasan_kmalloc+0xad/0xe0 [ 41.746632] ? kasan_slab_alloc+0x12/0x20 [ 41.750752] ? kmem_cache_alloc+0x12e/0x760 [ 41.755041] ? dst_alloc+0x11f/0x1a0 [ 41.758725] ? rt_dst_alloc+0xe9/0x540 [ 41.762591] ? ip_route_output_key_hash+0x20b/0x370 [ 41.767582] ? ip_route_output_flow+0x26/0xa0 [ 41.772047] ? inet_csk_route_req+0x5d8/0x990 [ 41.776509] ? tcp_v4_send_synack+0x1e4/0x270 [ 41.780970] ? tcp_rtx_synack+0x119/0x2e0 [ 41.785086] ? inet_rtx_syn_ack+0x64/0xd0 [ 41.789201] ? tcp_check_req+0xaf5/0x1630 [ 41.793320] ? tcp_v4_rcv+0x1f57/0x2f20 [ 41.797266] ? ip_local_deliver_finish+0x2e2/0xba0 [ 41.802171] ? check_noncircular+0x20/0x20 [ 41.806376] ? __netif_receive_skb_core+0x19af/0x33d0 [ 41.811535] ? __netif_receive_skb+0x2c/0x1b0 [ 41.815998] ? netif_receive_skb_internal+0x10b/0x5e0 [ 41.821159] ? check_noncircular+0x20/0x20 [ 41.825403] ? tun_chr_write_iter+0xde/0x190 [ 41.829781] ? __vfs_write+0x68a/0x970 [ 41.833645] xfrm_resolve_and_create_bundle+0x186/0x24b0 [ 41.839065] ? kmem_cache_alloc+0x4a2/0x760 [ 41.843374] ? xfrm_tmpl_resolve+0xbd0/0xbd0 [ 41.847755] ? lock_downgrade+0x990/0x990 [ 41.851869] ? dst_init+0x4d9/0x6a0 [ 41.855472] ? xfrm_selector_match+0xe00/0xe00 [ 41.860035] ? lock_release+0xd70/0xd70 [ 41.863987] ? refcount_inc_not_zero+0xfe/0x180 [ 41.868640] ? xfrm_selector_match+0x3b/0xe00 [ 41.873115] ? xfrm_sk_policy_lookup+0x2cf/0x3d0 [ 41.877848] ? xfrm_selector_match+0xe00/0xe00 [ 41.882405] ? check_noncircular+0x20/0x20 [ 41.886611] ? ip_route_output_key_hash_rcu+0x604/0x2c20 [ 41.892038] xfrm_lookup+0xf0a/0x2540 [ 41.895806] ? xfrm_lookup+0xf0a/0x2540 [ 41.899755] ? ip_route_input_noref+0x1e0/0x1e0 [ 41.904398] ? xfrm_policy_lookup_bytype.constprop.49+0x16f0/0x16f0 [ 41.910777] ? find_held_lock+0x39/0x1d0 [ 41.914820] ? lock_downgrade+0x990/0x990 [ 41.918941] ? selinux_netlbl_sock_rcv_skb+0x9e/0x730 [ 41.924108] ? ip_route_output_key_hash+0x1a6/0x370 [ 41.929099] ? lock_release+0xd70/0xd70 [ 41.933045] ? selinux_nf_register+0x30/0x30 [ 41.937426] ? __lock_acquire+0x732/0x4620 [ 41.941639] ? selinux_sock_rcv_skb_compat+0x2f4/0x480 [ 41.946891] ? ip_route_output_key_hash+0x252/0x370 [ 41.951877] ? ip_route_output_key_hash_rcu+0x2c20/0x2c20 [ 41.957393] xfrm_lookup_route+0x39/0x1a0 [ 41.961537] ip_route_output_flow+0x7c/0xa0 [ 41.965830] inet_csk_route_req+0x5d8/0x990 [ 41.970129] tcp_v4_send_synack+0x1e4/0x270 [ 41.974423] ? tcp_v4_send_check+0x90/0x90 [ 41.978635] ? sk_filter_trim_cap+0x12f/0x9b0 [ 41.983097] ? prandom_u32_state+0x13/0x180 [ 41.987394] tcp_rtx_synack+0x119/0x2e0 [ 41.991339] ? tcp_event_new_data_sent+0x2e0/0x2e0 [ 41.996240] ? __lock_is_held+0xbc/0x140 [ 42.000286] inet_rtx_syn_ack+0x64/0xd0 [ 42.004232] tcp_check_req+0xaf5/0x1630 [ 42.008181] ? tcp_openreq_init_rwin+0xae0/0xae0 [ 42.012910] ? refcount_inc_not_zero+0xfe/0x180 [ 42.017559] ? refcount_add+0x60/0x60 [ 42.021334] ? tcp_v4_reqsk_send_ack+0x3e0/0x3e0 [ 42.026065] ? tcp_filter+0x111/0x160 [ 42.029837] tcp_v4_rcv+0x1f57/0x2f20 [ 42.033614] ? lock_acquire+0x1d5/0x580 [ 42.037577] ? tcp_v4_early_demux+0xa30/0xa30 [ 42.042051] ip_local_deliver_finish+0x2e2/0xba0 [ 42.046787] ? inet_del_offload+0x40/0x40 [ 42.050908] ? nf_hook_slow+0xd3/0x1a0 [ 42.054771] ip_local_deliver+0x1ce/0x6e0 [ 42.058891] ? ip_call_ra_chain+0x6d0/0x6d0 [ 42.063192] ? inet_del_offload+0x40/0x40 [ 42.067320] ip_rcv_finish+0x8db/0x19c0 [ 42.071290] ? ip_local_deliver_finish+0xba0/0xba0 [ 42.076190] ? iptable_nat_ipv4_fn+0x40/0x40 [ 42.080568] ? nf_nat_ipv4_in_range+0xf0/0xf0 [ 42.085034] ? ip_rcv+0xbe0/0x17d0 [ 42.088542] ? find_held_lock+0x39/0x1d0 [ 42.092572] ? tcp_v4_send_synack+0x270/0x270 [ 42.097038] ? nf_nat_ipv4_in+0x1cd/0x270 [ 42.101155] ? iptable_nat_ipv4_fn+0x40/0x40 [ 42.105543] ? nf_hook_slow+0xd3/0x1a0 [ 42.109408] ip_rcv+0xc3f/0x17d0 [ 42.112750] ? ip_local_deliver+0x6e0/0x6e0 [ 42.117045] ? __lock_acquire+0x732/0x4620 [ 42.121261] ? ip_local_deliver_finish+0xba0/0xba0 [ 42.126165] ? ip_local_deliver+0x6e0/0x6e0 [ 42.130458] __netif_receive_skb_core+0x19af/0x33d0 [ 42.135458] ? print_usage_bug+0x480/0x480 [ 42.139672] ? nf_ingress+0x9f0/0x9f0 [ 42.143440] ? save_stack+0x43/0xd0 [ 42.147037] ? kasan_slab_alloc+0x12/0x20 [ 42.151151] ? kmem_cache_alloc+0x12e/0x760 [ 42.155440] ? __build_skb+0x9d/0x450 [ 42.159209] ? build_skb+0x6f/0x260 [ 42.162803] ? tun_build_skb.isra.42+0x92f/0x1690 [ 42.167626] ? tun_get_user+0x1dad/0x2150 [ 42.171743] ? tun_chr_write_iter+0xde/0x190 [ 42.176126] ? vfs_write+0x18f/0x510 [ 42.179808] ? __skb_flow_get_ports+0x151/0x400 [ 42.184444] ? skb_flow_dissector_init+0x280/0x280 [ 42.189345] ? check_noncircular+0x20/0x20 [ 42.193547] ? __skb_flow_get_ports+0x151/0x400 [ 42.198188] ? __skb_flow_dissect+0x85b/0x3bc0 [ 42.202741] ? print_usage_bug+0x480/0x480 [ 42.206957] ? find_held_lock+0x39/0x1d0 [ 42.210999] ? lock_downgrade+0x990/0x990 [ 42.215132] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 42.220296] ? netif_receive_skb_internal+0x1d7/0x5e0 [ 42.225481] ? pvclock_read_flags+0x160/0x160 [ 42.229942] ? tun_build_skb.isra.42+0x455/0x1690 [ 42.234760] ? lock_acquire+0x1d5/0x580 [ 42.238701] ? netif_receive_skb_internal+0x93/0x5e0 [ 42.243775] ? ktime_get_with_offset+0x2c1/0x420 [ 42.248506] ? lock_release+0xd70/0xd70 [ 42.252446] ? ktime_get+0x3a0/0x3a0 [ 42.256127] ? skb_put+0x149/0x1c0 [ 42.259644] __netif_receive_skb+0x2c/0x1b0 [ 42.263935] ? __netif_receive_skb+0x2c/0x1b0 [ 42.268402] netif_receive_skb_internal+0x10b/0x5e0 [ 42.273393] ? __lru_cache_add+0x2a4/0x410 [ 42.277627] ? dev_cpu_dead+0xb00/0xb00 [ 42.281572] ? __pagevec_lru_add+0x30/0x30 [ 42.285776] ? get_mem_cgroup_from_mm+0x49b/0x710 [ 42.290586] ? rcu_pm_notify+0xc0/0xc0 [ 42.294458] netif_receive_skb+0xae/0x390 [ 42.298576] ? netif_receive_skb_internal+0x5e0/0x5e0 [ 42.303739] ? lock_downgrade+0x990/0x990 [ 42.307861] ? tun_rx_batched.isra.43+0x5c3/0x860 [ 42.312677] tun_rx_batched.isra.43+0x5ed/0x860 [ 42.317319] ? skb_get_hash_perturb+0x9d0/0x9d0 [ 42.321958] ? tun_sock_write_space+0x370/0x370 [ 42.326634] tun_get_user+0x11dd/0x2150 [ 42.330611] ? tun_build_skb.isra.42+0x1690/0x1690 [ 42.335519] ? lock_release+0xd70/0xd70 [ 42.339470] ? tun_chr_close+0x60/0x60 [ 42.343335] ? lock_release+0xd70/0xd70 [ 42.347286] ? __lock_is_held+0xbc/0x140 [ 42.351330] ? __tun_get+0x1d4/0x2e0 [ 42.355016] ? tun_chr_close+0x60/0x60 [ 42.358882] tun_chr_write_iter+0xde/0x190 [ 42.363091] __vfs_write+0x68a/0x970 [ 42.366780] ? default_llseek+0x2a0/0x2a0 [ 42.370917] ? avc_policy_seqno+0x9/0x20 [ 42.374953] ? selinux_file_permission+0x82/0x460 [ 42.379777] ? rw_verify_area+0xe5/0x2b0 [ 42.383808] ? __fdget_raw+0x20/0x20 [ 42.387495] vfs_write+0x18f/0x510 [ 42.391023] SyS_write+0xef/0x220 [ 42.394456] ? lockdep_sys_exit+0x47/0xf0 [ 42.398582] ? SyS_read+0x220/0x220 [ 42.402189] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.407178] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.411913] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.416634] RIP: 0033:0x405b81 [ 42.419807] RSP: 002b:00007f6f531fdd90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 42.427488] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000405b81 [ 42.434725] RDX: 0000000000000036 RSI: 0000000020002000 RDI: 0000000000000003 [ 42.441987] RBP: 0000000000000082 R08: 0000000000000013 R09: 00007f6f531fe700 [ 42.449228] R10: 00007f6f531fe9d0 R11: 0000000000000293 R12: 0000000000000000 [ 42.456472] R13: 00007ffddec17b1f R14: 00007f6f531fe9c0 R15: 0000000000000000 [ 42.463730] [ 42.465326] The buggy address belongs to the page: [ 42.470227] page:ffffea0007359d80 count:0 mapcount:0 mapping: (null) index:0xffff8801cd6767c0 [ 42.479644] flags: 0x200000000000000() [ 42.483504] raw: 0200000000000000 0000000000000000 ffff8801cd6767c0 00000000ffffffff [ 42.491352] raw: dead000000000100 dead000000000200 ffff8801dac00dc0 0000000000000000 [ 42.499198] page dumped because: kasan: bad access detected [ 42.504872] [ 42.506469] Memory state around the buggy address: [ 42.511365] ffff8801cd676780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.518692] ffff8801cd676800: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 [ 42.526022] >ffff8801cd676880: 00 00 00 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 f1 [ 42.533349] ^ [ 42.537463] ffff8801cd676900: f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 f2 f3 [ 42.544790] ffff8801cd676980: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.552130] ================================================================== [ 42.559456] Disabling lock debugging due to kernel taint [ 42.564901] Kernel panic - not syncing: panic_on_warn set ... [ 42.564901] [ 42.572229] CPU: 0 PID: 3017 Comm: syzkaller067636 Tainted: G B 4.13.0-mm1+ #5