A list of Linux Security Modules is at https://en.wikipedia.org/wiki/Linux_Security_Modules
List of Linux Security Modules
snark
(I didn’t read the wiki page closely. Why was the heading “Adoption” and not something more clear?)
AppArmor
Integrity Policy Enforcement (IPE)[6]
Landlock[7][8]
LoadPin[9]
SafeSetID[10]
SELinux
Smack
TOMOYO
Yama[11]
As a long time SysAdmin, but not your SysAdmin, I have used two of these. Both had terrible documentation for which many “must use” paid software vendors advise disabling the Security Module as a first step.
If random software vendors’ lowest paid intern cannot figure out the settings for arbitrary Linux Security Modules, then the first line of the directions will always be to disable the security module. This leads to them not being used in many cases where the security module would be helpful.
snark
(To explain, it is only the cheapest and most inexperienced person that is typically responsible for doing things as they are not in meetings all day.)
I agree with Linus.
Perhaps.
Of course, the creators of the security modules could build tools to help them be used better. Maybe not on first release, but at least after other complain about the difficulty. AppArmor did attempt some tools, and is far better than SELinux. Still not great.