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Definition of "ring numbering" |
for access control, protection scheme in which every memory object is assigned a set of ring numbers and every executing process is assigned a number. The legality of an access attempt is determined by numeric comparisons between the execution ring number and the ring numbers of the object to be accessed. A typical design assigns more privilege to lower numbers, where the system programs reside. If there are three access modes (execute, read, write), three numbers (e, r ,w) are assigned to each object. Let p denote the ring number of the executing process. Then execute is permitted if p < e, read if p < r, and write if p < w. This scheme is simple to explain, but does not support general access control policies, since they cannot be mapped to a linear sequence of integer values. |
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