audit: type=1400 audit(1516343586.258:15): avc: denied { setopt } for pid=4801 comm="syz-executor0" 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: CONFIG_KASAN_INLINE enabled 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: 0 PID: 4811 Comm: syz-executor0 Not tainted 4.15.0-rc8+ #178 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:strlen+0x1f/0xa0 lib/string.c:479 RSP: 0018:ffff8801c06f75c8 EFLAGS: 00010292 RAX: 0000000041b58ab3 RBX: ffff8801ce62c080 RCX: 000000000836b156 RDX: dffffc0000000000 RSI: ffffc90001829000 RDI: 0000000041b58ab3 RBP: ffff8801c06f75e0 R08: 1ffff100380dee21 R09: 0000000000000005 R10: ffff8801c06f75d0 R11: 0000000000000001 R12: ffff8801c06f7700 R13: 0000000041b58ab3 R14: 0000000000000040 R15: 1ffff100380deec4 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77deb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020008000 CR3: 00000001c77fa004 CR4: 00000000001626f0 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:2324 netlink_rcv_skb+0x2d1/0x400 net/netlink/af_netlink.c:2415 genl_rcv+0x28/0x40 net/netlink/genetlink.c:635 netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline] netlink_unicast+0x4ee/0x700 net/netlink/af_netlink.c:1301 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xca/0x110 net/socket.c:648 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2028 __sys_sendmsg+0xe5/0x210 net/socket.c:2062 C_SYSC_sendmsg net/compat.c:739 [inline] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:737 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline] do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129 RIP: 0023:0xf7fe2c79 RSP: 002b:00000000f77de08c EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 000000002000bfc8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 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:479 RSP: ffff8801c06f75c8 ---[ end trace 5dba0556b60e29e2 ]---