audit: type=1400 audit(1541903052.029:6): avc: denied { write } for pid=2070 comm="syz-executor219" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 2070 Comm: syz-executor219 Not tainted 4.4.163+ #121 task: ffff8801d4d44740 task.stack: ffff8800b6e38000 RIP: 0010:[] [] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline] RIP: 0010:[] [] netlink_unicast+0x1d2/0x700 net/netlink/af_netlink.c:1297 RSP: 0018:ffff8800b6e3f768 EFLAGS: 00010293 RAX: dffffc0000000048 RBX: dffffc0000000000 RCX: 0000000000000030 RDX: 0000000000000000 RSI: ffffffff822e7c3b RDI: ffff8801d824e0d8 RBP: ffff8800b6e3f828 R08: ffffed003a8c22d5 R09: ffffed003a8c22d2 R10: ffffed003a8c22d4 R11: ffff8801d46116a7 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8801d824e000 R15: ffff8800b6e3f800 FS: 00000000026c1880(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fc41c75a98 CR3: 00000001d44fb000 CR4: 00000000001606b0 Stack: ffffffff8147ec91 0000000000000030 0000000000000240 1ffff10016dc7ef4 dffffc0000000006 dffffc0000000048 000000c000000816 0000000041b58ab3 ffffffff82c7ba16 ffffffff822e7a70 ffffffff821ef53b 0000000000000000 Call Trace: [] netlink_ack+0x236/0x4c0 net/netlink/af_netlink.c:2334 [] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline] [] nfnetlink_rcv+0xc39/0x1330 net/netfilter/nfnetlink.c:477 [] netlink_unicast_kernel net/netlink/af_netlink.c:1277 [inline] [] netlink_unicast+0x4ec/0x700 net/netlink/af_netlink.c:1303 [] netlink_sendmsg+0x694/0xc30 net/netlink/af_netlink.c:1859 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbb/0x110 net/socket.c:648 [] ___sys_sendmsg+0x745/0x880 net/socket.c:1975 [] __sys_sendmsg+0xd6/0x190 net/socket.c:2009 [] SYSC_sendmsg net/socket.c:2020 [inline] [] SyS_sendmsg+0x2d/0x50 net/socket.c:2016 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Code: 65 f6 01 ff 49 8d 57 c0 4c 89 e1 4c 89 f6 48 89 df e8 43 f7 ff ff 83 f8 01 0f 85 cf 03 00 00 e8 45 f6 01 ff 48 8b 85 68 ff ff ff <0f> b6 00 84 c0 74 08 3c 03 0f 8e ff 03 00 00 48 8b 85 60 ff ff RIP [] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline] RIP [] netlink_unicast+0x1d2/0x700 net/netlink/af_netlink.c:1297 RSP ---[ end trace a38113d82df67959 ]---