Ensure overlay kernel module is not available

점검 방법

감사 방식: 셸 명령

m=overlay; found=$(find /lib/modules/$(uname -r)/kernel /usr/lib/modules/$(uname -r)/kernel -path "*/overlay*" 2>/dev/null | head -n1); if [ -z "$found" ]; then echo compliant; exit 0; fi; lsmod | awk '{print $1}' | grep -Fxq -- "${m//-/_}" && { echo "$m is loaded"; exit 0; }; cfg=$(modprobe --showconfig 2>/dev/null); printf '%s\n' "$cfg" | grep -Pq -- "^\h*blacklist\h+${m//-/_}\b" || { echo "$m is not blacklisted"; exit 0; }; printf '%s\n' "$cfg" | grep -Pq -- "^\h*install\h+${m//-/_}\h+(/usr)?/bin/(true|false)\b" || { echo "$m install is not disabled"; exit 0; }; echo compliant

예상 출력

compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

Run the following to unload and disable the overlay kernel module. This can also be done by running the script included below. Run the following commands to unload the overlay kernel module: # modprobe -r overlay 2>/dev/null # rmmod overlay 2>/dev/null Perform the following to disable the overlay kernel module: Create a file ending in .conf with install overlay /bin/false in the /etc/modprobe.d/ directory Example: # printf '\n%s\n' "install overlay /bin/false" >> overlay.conf Create a file ending in .conf with blacklist overlay in the /etc/modprobe.d/ directory Example: # printf '\n%s\n' "blacklist overlay" >> overlay.conf Optional remediation script: This script will perform the above remed…

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tmaegis scan --target linux --level 2