What is the main purpose of the Enforcing Mode in SELinux?

The primary purpose of Enforcing Mode in SELinux is to actively enforce the security policies that have been defined on the system. In this mode, any actions that violate the SELinux policies are denied, and appropriate log entries are created to document these denials. This enforcement is crucial for maintaining a secure environment because it not only protects against unauthorized access and modifications but also holds processes accountable to the policies in place.

Running SELinux in Enforcing Mode ensures that the system behaves according to the strict guidelines set by the security policies, providing a robust defense against potential security threats. This mode is essential for environments that require high security, as it actively prevents any unauthorized actions based on the policies.

In contrast, the other options describe modes that do not enforce security policies. One option allows the system to run without any SELinux checks, which would leave it vulnerable. Another option would log access denials without enforcing policies, meaning violations could occur without any corrective action being taken. Lastly, operating with minimal checks would also reduce security, as fewer rules would be applied, exposing the system to risk. Therefore, the Enforcing Mode is vital for a proactive security posture in SELinux.