Disable CPU Speed (cpupower)

An XCCDF Rule

Description

The cpupower service can adjust the clock speed of supported CPUs based upon the current processing load thereby conserving power and reducing heat. The cpupower service can be disabled with the following command:

$ sudo systemctl mask --now cpupower.service

Rationale

The cpupower service is only necessary if adjusting the CPU clock speed provides benefit. Traditionally this has included laptops (to enhance battery life), but may also apply to server or desktop environments where conserving power is highly desirable or necessary.

ID: xccdf_org.ssgproject.content_rule_service_cpupower_disabled
Severity: Low
References: 11 14 3 9

BAI10.01 BAI10.02 BAI10.03 BAI10.05 DSS05.02 DSS05.05 DSS06.06

4.3.3.5.1 4.3.3.5.2 4.3.3.5.3 4.3.3.5.4 4.3.3.5.5 4.3.3.5.6 4.3.3.5.7 4.3.3.5.8 4.3.3.6.1 4.3.3.6.2 4.3.3.6.3 4.3.3.6.4 4.3.3.6.5 4.3.3.6.6 4.3.3.6.7 4.3.3.6.8 4.3.3.6.9 4.3.3.7.1 4.3.3.7.2 4.3.3.7.3 4.3.3.7.4 4.3.4.3.2 4.3.4.3.3

SR 1.1 SR 1.10 SR 1.11 SR 1.12 SR 1.13 SR 1.2 SR 1.3 SR 1.4 SR 1.5 SR 1.6 SR 1.7 SR 1.8 SR 1.9 SR 2.1 SR 2.2 SR 2.3 SR 2.4 SR 2.5 SR 2.6 SR 2.7 SR 7.6

A.12.1.2 A.12.5.1 A.12.6.2 A.14.2.2 A.14.2.3 A.14.2.4 A.9.1.2

CM-6(a) CM-7(a) CM-7(b)

PR.IP-1 PR.PT-3

CCE-82382-3
Updated: about 1 month ago

Remediation Templates

[customizations.services]
masked = ["cpupower"]

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
spec:
  config:
    ignition:
      version: 3.1.0    systemd:
      units:
      - name: cpupower.service
        enabled: false
        mask: true
      - name: cpupower.socket
        enabled: false
        mask: true

include disable_cpupower
class disable_cpupower {
  service {'cpupower':
    enable => false,
    ensure => 'stopped',
  }
}

service disable cpupower

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - CCE-82382-3
  - NIST-800-53-CM-6(a)  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_cpupower_disabled
- name: Disable CPU Speed (cpupower) - Collect systemd Services Present in the System
  ansible.builtin.command: systemctl -q list-unit-files --type service
  register: service_exists
  changed_when: false
  failed_when: service_exists.rc not in [0, 1]
  check_mode: false
  when: '"kernel" in ansible_facts.packages'
  tags:
  - CCE-82382-3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_cpupower_disabled

- name: Disable CPU Speed (cpupower) - Ensure cpupower.service is Masked
  ansible.builtin.systemd:
    name: cpupower.service
    state: stopped
    enabled: false
    masked: true
  when:
  - '"kernel" in ansible_facts.packages'
  - service_exists.stdout_lines is search("cpupower.service", multiline=True)
  tags:
  - CCE-82382-3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_cpupower_disabled

- name: Unit Socket Exists - cpupower.socket
  ansible.builtin.command: systemctl -q list-unit-files cpupower.socket
  register: socket_file_exists
  changed_when: false
  failed_when: socket_file_exists.rc not in [0, 1]
  check_mode: false
  when: '"kernel" in ansible_facts.packages'
  tags:
  - CCE-82382-3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_cpupower_disabled

- name: Disable CPU Speed (cpupower) - Disable Socket cpupower
  ansible.builtin.systemd:
    name: cpupower.socket
    enabled: false
    state: stopped
    masked: true
  when:
  - '"kernel" in ansible_facts.packages'
  - socket_file_exists.stdout_lines is search("cpupower.socket", multiline=True)
  tags:
  - CCE-82382-3
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed
  - service_cpupower_disabled

# Remediation is applicable only in certain platforms
if rpm --quiet -q kernel; then
SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" stop 'cpupower.service'
"$SYSTEMCTL_EXEC" disable 'cpupower.service'
"$SYSTEMCTL_EXEC" mask 'cpupower.service'# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files cpupower.socket; then
    "$SYSTEMCTL_EXEC" stop 'cpupower.socket'
    "$SYSTEMCTL_EXEC" mask 'cpupower.socket'
fi
# The service may not be running because it has been started and failed,
# so let's reset the state so OVAL checks pass.
# Service should be 'inactive', not 'failed' after reboot though.
"$SYSTEMCTL_EXEC" reset-failed 'cpupower.service' || true

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Disable CPU Speed (cpupower)

Description

Rationale

Remediation Templates

OS Build Blueprint

A Kubernetes Patch

A Puppet Snippet

script:kickstart

An Ansible Snippet

A Shell Script