IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready 8021q: adding VLAN 0 to HW filter on device bond0 IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready ================================================================== BUG: KASAN: use-after-free in sock_net_uid include/net/sock.h:1733 [inline] BUG: KASAN: use-after-free in ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26 Read of size 4 at addr ffff8801c090c1b0 by task syzkaller961695/4092 CPU: 0 PID: 4092 Comm: syzkaller961695 Not tainted 4.16.0-rc2+ #243 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+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 sock_net_uid include/net/sock.h:1733 [inline] ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26 ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:63 [inline] ip6table_mangle_hook+0x636/0x920 net/ipv6/netfilter/ip6table_mangle.c:77 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline] nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483 nf_hook include/linux/netfilter.h:243 [inline] NF_HOOK include/linux/netfilter.h:286 [inline] ip6_xmit+0x10ec/0x2260 net/ipv6/ip6_output.c:277 tcp_v6_send_synack+0x57b/0xaa0 net/ipv6/tcp_ipv6.c:490 tcp_conn_request+0x26fd/0x3660 net/ipv4/tcp_input.c:6335 tcp_v6_conn_request+0x212/0x270 net/ipv6/tcp_ipv6.c:1021 tcp_rcv_state_process+0x92a/0x4760 net/ipv4/tcp_input.c:5842 tcp_v6_do_rcv+0x739/0x1250 net/ipv6/tcp_ipv6.c:1331 tcp_v6_rcv+0x25a0/0x2d40 net/ipv6/tcp_ipv6.c:1521 ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input+0xdb/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish+0x297/0x8c0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4554 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4619 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4693 napi_frags_finish net/core/dev.c:5134 [inline] napi_gro_frags+0x58a/0xaf0 net/core/dev.c:5207 tun_get_user+0x2720/0x3810 drivers/net/tun.c:1940 tun_chr_write_iter+0xbd/0x1c0 drivers/net/tun.c:1985 call_write_iter include/linux/fs.h:1781 [inline] do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653 do_iter_write+0x154/0x540 fs/read_write.c:932 vfs_writev+0x18a/0x340 fs/read_write.c:977 do_writev+0xfc/0x2a0 fs/read_write.c:1012 SYSC_writev fs/read_write.c:1085 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1082 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x44d180 RSP: 002b:00007fff2fa4a7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000001a RCX: 000000000044d180 RDX: 0000000000000001 RSI: 00007fff2fa4a810 RDI: 00000000000000fc RBP: 00000000004af02d R08: 0000000000000013 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff2fa4a960 R13: 000000000040e290 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 2226: 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:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541 kmem_cache_zalloc include/linux/slab.h:691 [inline] inode_alloc_security security/selinux/hooks.c:234 [inline] selinux_inode_alloc_security+0xf9/0x390 security/selinux/hooks.c:2885 security_inode_alloc+0x90/0xd0 security/security.c:437 inode_init_always+0x653/0xca0 fs/inode.c:168 alloc_inode+0x82/0x180 fs/inode.c:216 new_inode_pseudo+0x69/0x190 fs/inode.c:890 new_inode+0x1c/0x40 fs/inode.c:919 proc_pid_make_inode+0x25/0x210 fs/proc/base.c:1746 proc_pident_instantiate+0x80/0x290 fs/proc/base.c:2435 proc_pident_lookup+0x19e/0x200 fs/proc/base.c:2484 proc_tgid_base_lookup+0x29/0x30 fs/proc/base.c:3037 lookup_slow+0x282/0x4d0 fs/namei.c:1633 walk_component+0x89f/0x13d0 fs/namei.c:1762 link_path_walk+0xd4e/0x1470 fs/namei.c:2091 path_openat+0x2bc/0x3530 fs/namei.c:3518 do_filp_open+0x25b/0x3b0 fs/namei.c:3553 do_sys_open+0x502/0x6d0 fs/open.c:1059 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 16: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3743 inode_free_rcu+0x1d/0x20 security/selinux/hooks.c:328 __rcu_reclaim kernel/rcu/rcu.h:172 [inline] rcu_do_batch kernel/rcu/tree.c:2674 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline] rcu_process_callbacks+0xd6c/0x17f0 kernel/rcu/tree.c:2917 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801c090c180 which belongs to the cache selinux_inode_security of size 96 The buggy address is located 48 bytes inside of 96-byte region [ffff8801c090c180, ffff8801c090c1e0) The buggy address belongs to the page: page:ffffea0007024300 count:1 mapcount:0 mapping:ffff8801c090c000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c090c000 0000000000000000 0000000100000020 raw: ffffea00070ade60 ffffea0007021360 ffff8801da5c3240 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c090c080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801c090c100: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8801c090c180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8801c090c200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801c090c280: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================