From a VM system user’s point of view, minidisks are shared DASD devices of various sizes, which are accessed in one of two ways:
Like anyone else, CA Top Secret users get access to their own minidisks at logon but with CA Top Secret, you can restrict users’ access to one another’s minidisks. For example, the following gives the DCA for the Finance Department (FINDCA) READ access for all of USER01’s, USER02’s, and USER03’s 019x minidisks ranging from 0190 through 019F:
TSS PERMIT(FINDCA) VMMDISK(USER01.019,USER02.019,USER03.019)
ACCESS(READ)
As far as VM is concerned, users own minidisks because of MDISK statements in their directories. When users LINK to their own minidisks, no security is needed (not even CA Top Secret). When one user tries to LINK to another user’s minidisk, however, CA Top Secret provides security checking.
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