[improvement] hardening.config linux kernel

[coelner]

Maybe it would be useful to use this specific config:
https://github.com/torvalds/linux/blob/master/kernel/configs/hardening.config

[paralin]

I will add a package named util/hardened which does this.

That would be the opposite of the insecure package, which disables hardening. https://github.com/skiffos/SkiffOS/tree/master/configs/util/insecure