audit: type=1400 audit(1516306438.726:10): avc: denied { write } for pid=3665 comm="syzkaller396868" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 3665 Comm: syzkaller396868 Not tainted 4.15.0-rc8-next-20180118+ #100 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:strlen+0x1f/0xa0 lib/string.c:441 RSP: 0018:ffff8801c3087768 EFLAGS: 00010292 RAX: 0000000041b58ab3 RBX: ffff8801bd253500 RCX: 000000000836b156 RDX: dffffc0000000000 RSI: ffff8801bc004a40 RDI: 0000000041b58ab3 RBP: ffff8801c3087780 R08: 1ffff10038610e55 R09: 0000000000000000 R10: ffff8801c3087770 R11: ffffed0038610e40 R12: ffff8801c30878a0 R13: 0000000041b58ab3 R14: 0000000000000040 R15: 1ffff10038610ef8 FS: 0000000002090880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020007000 CR3: 00000001bc7e7006 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: strlen include/linux/string.h:266 [inline] netlink_ack+0x120/0xa10 net/netlink/af_netlink.c:2357 netlink_rcv_skb+0x2d1/0x400 net/netlink/af_netlink.c:2448 genl_rcv+0x28/0x40 net/netlink/genetlink.c:635 netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline] netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2020 __sys_sendmsg+0xe5/0x210 net/socket.c:2054 SYSC_sendmsg net/socket.c:2065 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2061 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x43fdc9 RSP: 002b:00007ffc5e698268 EFLAGS: 00000217 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdc9 RDX: 0000000000000000 RSI: 0000000020008000 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000217 R12: 00000000004016f0 R13: 0000000000401780 R14: 0000000000000000 R15: 0000000000000000 Code: 37 ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 f9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 48 89 f8 48 89 e5 41 54 53 48 83 ec 08 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 04 84 d2 75 4b 80 38 00 RIP: strlen+0x1f/0xa0 lib/string.c:441 RSP: ffff8801c3087768 ---[ end trace dbfc8fde0863de53 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..