Negative Ramifications To Increasing MAXUSER On A Top Secret Facility

Products

• Cleanup
• Top Secret
• Top Secret - LDAP
• Top Secret - VSE

Issue/Introduction

Are there any negative ramifications to increasing the MAXUSER facility control option?

Environment

Release: TOPSEC00200-15-Top Secret-Security
Component:

Resolution

At the startup of a multi user region, the MAXUSER XREF table is built to hold the userid and key.

• This table is 16 bytes times the MAXUSER value.
• There is one 16 byte entry for each user that signs on.
• The table is built in private storage above the line.
• After the user signs off, the entry in the table for that user is cleared and available to be re-used.

The impact of increasing MAXUSER is the next time the region is started, the XREF table will be larger by:

16 bytes * the difference between the old MAXUSER value and the new MAXUSER value