I wrote an authorized program that displays the contents of control registers
using the STCTG instruction. Linked AC(1) and stored in an APF library.
Substantive instructions are:
MODESET MODE=SUP For STCTG instruction
STCTG 0,15,CRREGS Store (copy) Control Registers
MODESET MODE=PROB
When called using LINK from an unauthorized program (linked AC(0) to the same
APF authorized library), an S047 abend occurs at the first MODESET macro (which
generates an SVC 107).
When the unauthorized program is linked authorized (AC(1)), the call (LINK)
works.
I thought unauthorized programs can call (LINK) authorized programs, but
authorized programs cannot call unauthorized programs, or, if they do, they
lose authorization.
Yes, the program with MODESET MODE=SUP could be made into a PC, but it would be
easier to avoid that method.
Any elucidation appreciated — Thanks
Richard Zierdt
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