Understanding the 'Permission Denied' Error When Loading SELinux Policy

Encountering a 'Permission denied' error while attempting to load the SELinux policy suggests an issue with SELinux user permissions. This error, typically seen when executing commands like 'ys', indicates that the executing user lacks the necessary access rights to read the SELinux policy file located at '/sys/fs/selinux/policy'.

SELinux (Security-Enhanced Linux) is a mandatory access control system designed to enhance the security of Linux-based systems. It regulates file access and process execution based on predefined security policies. The policy file defines these rules and permissions.

**Potential Causes and Solutions:**

* **Insufficient User Privileges:** The user account attempting to load the SELinux policy might not have the required permissions. Solutions include running the command as root or using a user account with appropriate SELinux privileges.
* **SELinux Configuration:** Incorrect SELinux configuration can lead to permission issues. Reviewing the SELinux policy settings and ensuring that the necessary user or group has read access to the '/sys/fs/selinux/policy' file is crucial.
* **File System Permissions:** The SELinux policy file itself might have restrictive permissions. Verifying the file permissions using the 'ls -l' command and adjusting them if necessary can resolve this.

**Diagnostic Steps:**

* **Check SELinux Status:** Ensure SELinux is enabled using the command 'sestatus'.
* **Examine User Permissions:** Use the command 'ls -l /sys/fs/selinux/policy' to check the file permissions.
* **Review SELinux Logs:** Analyze SELinux logs for any relevant messages or errors related to policy loading or permission denial.
* **Consult Documentation:** Refer to the KernelSU Manager documentation or SELinux documentation for specific information about permission requirements and configuration settings.

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