The ALG that is part of a CDS must have the capability to implement journaling.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-205046
SRG-NET-000511-ALG-000052
SV-205046r831404_rule
Medium
Description
A journaling file system is a file system that keeps track of the changes that will be made in a journal (usually a circular log in a dedicated area of the file system) before committing them to the main file system. In the event of a system crash or power failure, such file systems are quicker to bring back online and less likely to become corrupted.
The internal format of the journal must guard against crashes while the journal itself is being written to. Many journal implementations (such as the JBD2 layer in ext4) bracket every change logged with a checksum, on the understanding that a crash would leave a partially written change with a missing (or mismatched) checksum that can simply be ignored when replaying the journal at next remount.