What is securelevel?

The securelevel is a security mechanism implemented in the kernel. Basically, when the securelevel is positive, the kernel restricts certain tasks; not even the superuser (i.e. , root) is allowed to do them.

At the time of this writing, the securelevel mechanism is capable of, among other things, limiting the ability to, • unset certain file flags, such as schg (the system immutable flag), • write to kernel memory via /dev/mem and /dev/kmem, • load kernel modules, and • alter firewall rules. More.

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