Abstract: This paper introduces the Bell-LaPadula model, the Clark-Wilson model and the RBAC model. Based on these three security policy models, combined with the LSM access framework system, a secure operating system solution that meets the requirements of the structured protection level is designed, providing the composition and functions of the security system, so that the Linux operating system can reach a high security protection level. This security system combines a series of functions and technologies such as a powerful access control mechanism, system privilege separation, and security auditing, reflecting the principles of security, reliability, practicality, and compatibility in the design of a secure operating system. [Author Abstract]
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