Seymour I didn’t disagree however teaching anyone how to turn on the JSCBAUTH 
bit is stupid 



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No one said I could type with one thumb 

> On Nov 18, 2024, at 15:51, Seymour J Metz <sme...@gmu.edu> wrote:
> 
> AC(1) is only relevant when an authorized program does an ATTACH RSAPF=YES.
> 
> -- 
> Shmuel (Seymour J.) Metz
> http://mason.gmu.edu/~smetz3
> עַם יִשְׂרָאֵל חַי
> נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר
> 
> 
> 
> ________________________________________
> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of 
> Richard Zierdt <richard.zie...@freschesolutions.com>
> Sent: Monday, November 18, 2024 12:02 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Program Authorization: Unauthorized programs calling Authorized
> 
> External Message: Use Caution
> 
> 
> 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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