Back in 2000, there was something like that for the kernel with SELinux (Security-Enhanced Linux). Which continues to live in various distributions' kernels. Not a full O/S though, and not generally regarded as a PoS.
I always found it to be a real PITA... It felt like a parallel system to file permissions, which meant I had two things to configure instead of one and I never really saw the purpose. It seemed like it could be more granular than the default, but if it did anything more than that I never learned about it
Granted, I'm a dev, not an admin. I go back and configure the firewall after I shut it off because it was in my way... Eventually
I'm honestly surprised the us govt hasn't developed their own pos locked downed Linux os.
It seems the baddies are way ahead of the curve:
https://itsfoss.com/linux-national-os/
"Baddies"
LTT had a video on using North Korea linux
Blue Star OS?
Blue stripe os
Back in 2000, there was something like that for the kernel with SELinux (Security-Enhanced Linux). Which continues to live in various distributions' kernels. Not a full O/S though, and not generally regarded as a PoS.
I always found it to be a real PITA... It felt like a parallel system to file permissions, which meant I had two things to configure instead of one and I never really saw the purpose. It seemed like it could be more granular than the default, but if it did anything more than that I never learned about it
Granted, I'm a dev, not an admin. I go back and configure the firewall after I shut it off because it was in my way... Eventually