a processor; and

a memory, configured for storing computer-readable instructions, wherein the computer-readable instructions, when executed by the processor, cause the processor to perform operations of:

receiving and parsing an access request, and determining a subject and an object corresponding to the access request;

by using a security access strategy, obtaining a first result whether the subject has a permission to access the object, and determining whether a match access control linked list exists;

when the access control linked list exists, by using the access control linked list, obtaining a second result whether the subject has a permission to access the object; and

when the second result is obtained, by using the second result, performing control processing on the access request, or when the second result is not obtained, by using the first result, performing control processing on the access request.