Tom,

Please examine, 

http://publibz.boulder.ibm.com/zoslib/pdf/OA56180.pdf

The above document states that the SAF access is required both to obtain and to 
access the storage. I suspect some tricky work around the segment and paging 
tables has been used to achieve this. Hence the 1M granularity.

Lennie Dymoke-Bradshaw | Security Lead | RSM Partners Ltd  
Web:              www.rsmpartners.com
‘Dance like no one is watching. Encrypt like everyone is.’

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Tom 
Marchant
Sent: 10 September 2019 15:27
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: [IBM-MAIN] APAR OA56180 / RUCSA

On Tue, 10 Sep 2019 09:54:43 +0200, Martin Packer  wrote:

>If you are enabled to use User-Key CSA via RUCSA I believe you "have a 
>ticket to THE party", the ONE AND ONLY party. Meaning you can access 
>other users' allocations of User Key CSA.

If I understand it correctly, anyone can access RUCSA storage once someone 
obtains it. The limitation is on who can issue GETMAIN (or STORAGE OBTAIN) for 
user key CSA.

--
Tom Marchant

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