AC(1) is only relevant with ATTACH RSAPF=YES, and AFAIK nobody but the 
Initiayor and the TMP does that.

________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Joseph Reichman <[email protected]>
Sent: Thursday, September 28, 2023 9:14 AM
To: [email protected]
Subject: Re: SCHEDIRB

I did get an abend after SVC 8 in the code that ran the IRB the module was not 
linked AC=1



> On Sep 28, 2023, at 9:11 AM, Peter Relson <[email protected]> wrote:
>
> Jon P wrote
> <snip>
> I believe that LOAD will abend if the module is not linked with the AC=1 
> attribute when running authorized.
> </snip>
>
> It will not. You should have AC=1 only for a module that is the target of 
> something akin to EXEC PGM= (i.e., the jobstep program). It's easier to obey 
> this rule than to ensure that unnecessarily-marked AC=1 modules properly 
> protect system security/integrity. The module would need to be in an 
> APF-authorized library/concatenation.
>
> <snip>
> TSO does SVC screening to protect itself from SUP and non-KEY8 security 
> exposures.
> </snip>
>
> That seems quite unlikely to me. But you could be right.
>
> Peter Relson
> z/OS Core Technology Design
>
>
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