IBM AIX
TMA-AIX-4.4.3.1
Ensure only / permits device files.
Description
The filesystem mount option nodev ensures that special device files are not recognized as device files. This recommendation audits all rootvg filesystems to ensure that only the root filesystem '/' allows the use of device special files. Audit: automated read-only check derived from the CIS audit procedure; it prints "compliant" when the control is met.
How it is checked
Audit method: Shell command
command -v lsfs >/dev/null 2>&1 || exit 1; out=$( { lsfs | grep jfs | egrep -v "/dev/hd4|nodev"; mount | grep jfs | egrep -v "/dev/hd4|nodev" ; } 2>/dev/null ); [ -z "$out" ] && echo compliant || printf '%s\n' "$out" | head -n 20- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
The following command remounts filesystems with 'nodev' added: mount | grep jfs | /usr/bin/egrep -v "/dev/hd4|nodev" | while read lv fs jfs m d t options do mount -o remount,${options},nodev $fs done The following command updates the stanza in /etc/filesystems lsfs | grep jfs | /usr/bin/egrep -v "/dev/hd4|nodev" | while read lv node fs jfs size options rest do if [ ${options} == "--" ]; then chfs -a options=nodev $fs else chfs -a options=${options},nodev $fs fi done
Properties
- Operating systems
- Any
- Tags
- aixpermissions
- Reference
- CIS IBM AIX 7 Benchmark v1.2.0 - 4.4.3.1 Ensure only / permits device files.
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target aix