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
Updated: over 1 year ago

Remediation Templates

- name: Block Disable service cpupower
  block:
  - name: Disable service cpupower
    block:

    - name: Disable service cpupower      systemd:
        name: cpupower.service
        enabled: 'no'
        state: stopped
        masked: 'yes'
    rescue:

    - name: Intentionally ignored previous 'Disable service cpupower' failure, service
        was already disabled
      meta: noop
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - 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
  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: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - 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 socket cpupower
  systemd:
    name: cpupower.socket
    enabled: 'no'
    state: stopped
    masked: 'yes'
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - socket_file_exists.stdout_lines is search("cpupower.socket",multiline=True)
  tags:
  - 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

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

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

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

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; 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

An Ansible Snippet

A Kubernetes Patch

OS Build Blueprint

A Puppet Snippet

A Shell Script