Which component provides modifications to the Linux kernel to ensure higher levels of security?

• A. Kernel
• B. SEAndroid
• C. Trusted Solaris
• D. SELinux

Answer: (D)

SELinux (Security-Enhanced Linux) adds Mandatory Access Control to Linux by loading as a security module into the kernel. It enforces policy-driven rules that label all subjects (like processes) and objects (like files) and determine which interactions are allowed. This means actions can be restricted even for privileged users if the policy disallows them, providing a much stronger security boundary than discretionary permissions alone. The Android variant, SEAndroid, uses SELinux policies on Android devices, but it’s still SELinux providing the kernel-level enforcement. Trusted Solaris is a separate security model used on a Solaris-based system. In short, SELinux is the component that integrates with the Linux kernel to enforce stricter security through MAC policies.