Ensure prelink is disabled

MediumLevel 1Automatedros

Description

prelink is a program that modifies ELF shared libraries and ELF dynamically linked binaries in such a way that the time needed for the dynamic linker to perform relocations at startup significantly decreases. The audit requires the prelink package not to be installed. Host-level control from the CIS ROS Melodic benchmark (Ubuntu 18.04 robot hosts); run as root.

How it is checked

Audit method: Shell command

shell

command -v dpkg-query >/dev/null 2>&1 || exit 1
bad=0
for p in prelink; do
  s=$(dpkg-query -W -f='${Status}' "$p" 2>/dev/null)
  case "$s" in *' installed') echo "$p is installed"; bad=1 ;; esac
done
[ "$bad" -eq 0 ] && echo compliant

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Run the following command to restore binaries to normal: # prelink -ua Uninstall prelink using the appropriate package manager or manual installation: # apt purge prelink

Properties

Operating systems: Any
Tags: rosros1melodicsystem
Reference: CIS ROS Melodic Benchmark v1.0.0 - 1.6.3 Ensure prelink is disabled

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target ros