On Classified Systems, Logical Partition must be restricted with read/write access to only its own IOCDS.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-256863	SRG-OS-000080-GPOS-00048	HLP0020	SV-256863r958472_rule	2024-06-24	2

Description
Unrestricted control over the IOCDS files could result in unauthorized updates and impact the configuration of the environment by allowing unauthorized access to a restricted resource. This could severely damage the integrity of the environment and the system resources.

ℹ️ Check
Using the Hardware Management Console, verify that a logical partition cannot read or write to any IOCDS. Use the Security Definitions Page panel to do this by checking to see if the Input/Output (I/O) Configuration Control option has been turned on. NOTE: The default is applicable to only classified systems. Confirm whether or not the I/O Configuration Control option is checked. If the Logical Partition is not restricted with read/write access to only its own IOCDS, this is a FINDING.

ℹ️ Check

Using the Hardware Management Console, verify that a logical partition cannot read or write to any IOCDS. Use the Security Definitions Page panel to do this by checking to see if the Input/Output (I/O) Configuration Control option has been turned on. NOTE: The default is applicable to only classified systems. Confirm whether or not the I/O Configuration Control option is checked. If the Logical Partition is not restricted with read/write access to only its own IOCDS, this is a FINDING.

✔️ Fix
Review the Security Definition parameters specified under Processor Resource/Systems Manager (PR/SM). Verify and implement the correct settings.