how can i get a xxx.ko file?

[luozhiyun993]

Beacause my company need to Signed kernel module,

so when i use this : ./samples/lj-lua-stacks.sxx --arg time=5 --skip-badvars -x 5878

and then server will give me :

Found exact match for libluajit: /usr/local/openresty/luajit/lib/libluajit-5.1.so.2.1.0
ERROR: Couldn't insert module '/tmp/stap2aamnM/stap_adf2660fb37e7e80e31dbfe8dc46d514_21214.ko': Required key not available
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed. [man error::pass5]

so how can i just get a ko file ?