On Tue, 27 Apr 2021 15:32:12 +0300, Itschak Mugzach wrote:

>Have a look at getpwent. If I am not allowing a user to list RACF users,
>why are they allowed to list it via this command using syscalls?
> 
If you see a security problem here, open a PMR with IBM.  IBM takes
security issues seriously.

I suspect the underlying service you need to protect is BPX1GPE:
    
https://www.ibm.com/docs/en/zos/2.4.0?topic=descriptions-getpwent-bpx1gpe-bpx4gpe-sequentially-access-user-database

-- gil

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