OpenShift must prevent unauthorized and unintended information transfer via shared system resources and enable page poisoning.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257548	CNTR-OS-000560	SV-257548r921587_rule		Medium

Description
Enabling page poisoning in OpenShift improves memory safety, mitigates memory corruption vulnerabilities, aids in fault isolation, assists with debugging. It enhances the overall security and stability of the platform, reducing the risk of memory-related exploits and improving the resilience of applications running on OpenShift.

STIG	Date
Red Hat OpenShift Container Platform 4.12 Security Technical Implementation Guide	2023-08-28

Details

Check Text ( C-61283r921585_chk )
Check the current CoreOS boot loader configuration has page poisoning enabled by executing the following: for node in $(oc get node -oname); do oc debug $node -- chroot /host /bin/bash -c 'echo -n "$HOSTNAME "; grep page_poison /boot/loader/entries/*.conf\|\| echo "not found"' 2>/dev/null; done If "page_poison" is not set to "1" or returns "not found", this is a finding.

Fix Text (F-61207r921586_fix)
Apply the machine config to enable page poisoning by executing the following: for mcpool in $(oc get mcp -oname \| sed "s:.*/::" ); do echo "apiVersion: machineconfiguration.openshift.io/v1 kind: MachineConfig metadata: name: 05-kernelarg-page-poison-$mcpool labels: machineconfiguration.openshift.io/role: $mcpool spec: config: ignition: version: 3.1.0 kernelArguments: - page_poison=1 " \| oc apply -f - done

Fix Text (F-61207r921586_fix)

Apply the machine config to enable page poisoning by executing the following:

for mcpool in $(oc get mcp -oname | sed "s:.*/::" ); do
echo "apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
name: 05-kernelarg-page-poison-$mcpool
labels:
machineconfiguration.openshift.io/role: $mcpool
spec:
config:
ignition:
version: 3.1.0
kernelArguments:
- page_poison=1
" | oc apply -f -
done