TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. ================================================================== BUG: KASAN: slab-out-of-bounds in __ptr_ring_produce include/linux/ptr_ring.h:110 [inline] BUG: KASAN: slab-out-of-bounds in ptr_ring_produce include/linux/ptr_ring.h:133 [inline] BUG: KASAN: slab-out-of-bounds in tun_net_xmit+0x1af2/0x1c90 drivers/net/tun.c:1115 Read of size 8 at addr ffff8801c0cb4288 by task syz-executor5/20253 CPU: 1 PID: 20253 Comm: syz-executor5 Not tainted 4.20.0-rc1+ #328 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __ptr_ring_produce include/linux/ptr_ring.h:110 [inline] ptr_ring_produce include/linux/ptr_ring.h:133 [inline] tun_net_xmit+0x1af2/0x1c90 drivers/net/tun.c:1115 __netdev_start_xmit include/linux/netdevice.h:4356 [inline] netdev_start_xmit include/linux/netdevice.h:4365 [inline] xmit_one net/core/dev.c:3252 [inline] dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3268 sch_direct_xmit+0x48b/0x1130 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x636/0x1990 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:121 [inline] __dev_xmit_skb net/core/dev.c:3447 [inline] __dev_queue_xmit+0x1915/0x3ad0 net/core/dev.c:3806 dev_queue_xmit+0x17/0x20 net/core/dev.c:3871 neigh_hh_output include/net/neighbour.h:474 [inline] neigh_output include/net/neighbour.h:482 [inline] ip6_finish_output2+0x1342/0x27a0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x58c/0xc60 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x232/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ndisc_send_skb+0x1005/0x1570 net/ipv6/ndisc.c:491 ndisc_send_rs+0x134/0x6e0 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x314/0x690 net/ipv6/addrconf.c:3836 call_timer_fn+0x272/0x920 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7e5/0xc70 kernel/time/timer.c:1682 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1695 __do_softirq+0x308/0xb7e kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804 RIP: 0010:tcp_connect+0x23e3/0x46e0 net/ipv4/tcp_output.c:3517 Code: e2 fa 4c 8d ab 50 02 00 00 e8 09 c0 e2 fa 48 8b b5 98 fc ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 0f b6 14 02 <48> 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ae 1e 00 00 48 RSP: 0018:ffff8801badaeeb8 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff880181cd8180 RCX: ffffc9000c5c5000 RDX: 0000000000000000 RSI: ffff880181cd8a6c RDI: 0000000000000005 RBP: ffff8801badaf280 R08: ffff88018b2a4000 R09: 0000000000000006 R10: ffffed0038f2dec4 R11: ffff88018b2a4000 R12: ffff8801c019e910 R13: ffff880181cd83d0 R14: ffff8801c796f500 R15: ffff8801c019e900 tcp_v6_connect+0x1c0f/0x29b0 net/ipv6/tcp_ipv6.c:321 __inet_stream_connect+0x992/0x1150 net/ipv4/af_inet.c:655 tcp_sendmsg_fastopen net/ipv4/tcp.c:1161 [inline] tcp_sendmsg_locked+0x2b37/0x3fa0 net/ipv4/tcp.c:1208 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1443 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fec14aeec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457569 RDX: 5b37ca81a71c1086 RSI: 0000000020f6f000 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000020000040 R09: 000000000000001c R10: 0000000020000003 R11: 0000000000000246 R12: 00007fec14aef6d4 R13: 00000000004c3b92 R14: 00000000004d5ce0 R15: 00000000ffffffff Allocated by task 20012: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node+0x50/0x70 mm/slab.c:3691 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x65/0xf0 mm/util.c:416 kvmalloc include/linux/mm.h:577 [inline] kvmalloc_array include/linux/mm.h:595 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:475 [inline] ptr_ring_resize_multiple include/linux/ptr_ring.h:635 [inline] tun_queue_resize drivers/net/tun.c:3549 [inline] tun_device_event+0x56a/0x106c drivers/net/tun.c:3568 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1733 call_netdevice_notifiers net/core/dev.c:1751 [inline] dev_change_tx_queue_len+0x188/0x270 net/core/dev.c:7668 dev_ifsioc+0x799/0xa80 net/core/dev_ioctl.c:287 dev_ioctl+0x1b5/0xcc0 net/core/dev_ioctl.c:488 sock_do_ioctl+0x1f6/0x420 net/socket.c:973 sock_ioctl+0x313/0x690 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18582: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 kzfree+0x28/0x30 mm/slab_common.c:1564 aa_free_task_ctx security/apparmor/include/task.h:61 [inline] apparmor_task_free+0x13a/0x1e0 security/apparmor/lsm.c:95 security_task_free+0x4a/0x80 security/security.c:1007 __put_task_struct+0x195/0x620 kernel/fork.c:724 put_task_struct include/linux/sched/task.h:96 [inline] delayed_put_task_struct+0x2ff/0x4c0 kernel/exit.c:181 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0x100a/0x1ac0 kernel/rcu/tree.c:2697 __do_softirq+0x308/0xb7e kernel/softirq.c:292 The buggy address belongs to the object at ffff8801c0cb4280 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff8801c0cb4280, ffff8801c0cb42a0) The buggy address belongs to the page: page:ffffea0007032d00 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801c0cb4fc1 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea00075ef308 ffffea0007216888 ffff8801da8001c0 raw: ffff8801c0cb4fc1 ffff8801c0cb4000 0000000100000023 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c0cb4180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801c0cb4200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801c0cb4280: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8801c0cb4300: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8801c0cb4380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================