If this is off (ie. "permissive"), then modules for which the key is not
available and modules that are unsigned are permitted, but the kernel will
- be marked as being tainted.
+ be marked as being tainted, and the concerned modules will be marked as
+ tainted, shown with the character 'X'.
If this is on (ie. "restrictive"), only modules that have a valid
signature that can be verified by a public key in the kernel's possession