I know of at least one event where a site specific SVC which allowed to
store into write protected storage
stopped a whole MVS system, involving thousand of users (IMS, TSO,
Batch, DB2, during day shift),
because the store went into address zero "by mistake".
Kind regards
Bernd
Am 08.08.2020 um 23:53 schrieb Paul Gilmartin:
System Integrity is defined for MVS as the inability of any program
not authorized by a mechanism under the customer's control to:
• circumvent or disable store or fetch protection
• access an OS password-protected or a RACF-protected resource (RACF is
the Resource Access Control Facility), or
• obtain control in an authorized state; that is, in supervisor state,
with a protection key less than eight (8), or Authorized Program Facility (APF)
authorized.
Of course, "under the customer's control" is a key phrase.
