TCP: request_sock_TCPv6: Possible SYN flooding on port 20006. Sending cookies. Check SNMP counters. APIC base relocation is unsupported by KVM ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline] BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144 Write of size 160 at addr ffff8801d528c9e0 by task syz-executor1/27505 CPU: 1 PID: 27505 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #265 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x137/0x190 mm/kasan/kasan.c:267 memcpy+0x37/0x50 mm/kasan/kasan.c:303 memcpy include/linux/string.h:344 [inline] tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144 tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213 cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255 tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline] tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316 tcp_v6_rcv+0x2309/0x2b60 net/ipv6/tcp_ipv6.c:1510 ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:250 [inline] ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:466 [inline] ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:250 [inline] ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4473 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4538 process_backlog+0x203/0x740 net/core/dev.c:5217 napi_poll net/core/dev.c:5615 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5681 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1139 do_softirq.part.19+0x14d/0x190 kernel/softirq.c:329 do_softirq kernel/softirq.c:177 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline] ip6_finish_output2+0xba6/0x23a0 net/ipv6/ip6_output.c:121 ip6_finish_output+0x302/0x930 net/ipv6/ip6_output.c:146 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:163 dst_output include/net/dst.h:460 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ip6_xmit+0xd84/0x2090 net/ipv6/ip6_output.c:269 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139 tcp_transmit_skb+0x1b1b/0x38c0 net/ipv4/tcp_output.c:1176 tcp_write_xmit+0x686/0x51d0 net/ipv4/tcp_output.c:2367 __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2543 tcp_send_fin+0x1b0/0xd20 net/ipv4/tcp_output.c:3087 tcp_close+0xbe0/0xfc0 net/ipv4/tcp.c:2234 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432 sock_release+0x8d/0x1e0 net/socket.c:602 sock_close+0x16/0x20 net/socket.c:1131 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73f/0x16c0 kernel/signal.c:2335 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x9e/0xa0 RIP: 0033:0x452df9 RSP: 002b:00007fe8f074bce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000071bec8 RCX: 0000000000452df9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bec8 RBP: 000000000071bec8 R08: 0000000000000497 R09: 000000000071bea0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007fe8f074c9c0 R15: 0000000000000000 Allocated by task 27505: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544 sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463 sk_clone_lock+0x152/0x1570 net/core/sock.c:1649 inet_csk_clone_lock+0x92/0x4f0 net/ipv4/inet_connection_sock.c:781 tcp_create_openreq_child+0x9b/0x1b70 net/ipv4/tcp_minisocks.c:449 tcp_v6_syn_recv_sock+0x22d/0x23a0 net/ipv6/tcp_ipv6.c:1123 tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213 cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255 tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline] tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316 tcp_v6_rcv+0x2309/0x2b60 net/ipv6/tcp_ipv6.c:1510 ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:250 [inline] ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:466 [inline] ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:250 [inline] ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4473 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4538 process_backlog+0x203/0x740 net/core/dev.c:5217 napi_poll net/core/dev.c:5615 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5681 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8801d528c000 which belongs to the cache TCP of size 2528 The buggy address is located 0 bytes to the right of 2528-byte region [ffff8801d528c000, ffff8801d528c9e0) The buggy address belongs to the page: page:ffffea000754a300 count:1 mapcount:0 mapping:ffff8801d528c000 index:0xffff8801d528dffd compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d528c000 ffff8801d528dffd 0000000100000003 raw: ffffea00075835a0 ffffea00070bea20 ffff8801d9842080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d528c880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801d528c900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801d528c980: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff8801d528ca00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d528ca80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================