TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. ================================================================== 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 ffff8801c09a3ee0 by task ksoftirqd/0/7 CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.15.0-rc8+ #267 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 run_ksoftirqd+0x50/0x100 kernel/softirq.c:666 smpboot_thread_fn+0x450/0x7c0 kernel/smpboot.c:164 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:541 Allocated by task 7: 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 ffff8801c09a3500 which belongs to the cache TCP of size 2528 The buggy address is located 0 bytes to the right of 2528-byte region [ffff8801c09a3500, ffff8801c09a3ee0) The buggy address belongs to the page: page:ffffea0007026880 count:1 mapcount:0 mapping:ffff8801c09a2000 index:0xffff8801c09a3ffd compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801c09a2000 ffff8801c09a3ffd 0000000100000003 raw: ffffea0007516420 ffffea000762aba0 ffff8801d8346340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c09a3d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c09a3e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c09a3e80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff8801c09a3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c09a3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================