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Case: Linux Ext4 journal_err

Requirements

  • Oracle VM VirtualBox;
  • Grml 2014.11;
  • Kali 1.1.0a.

Description

The Linux Ext4 journal_err.ova file contains a virtual machine with two drives making up an Ext4 file system with external journaling. There is an error recorded in the journal on /dev/sdb1, and the Ext4 file system driver will transfer an error code from the journal to the primary superblock of the file system on /dev/sda1 during the mount operation (unless you specify the "noload" mount option) – see Fig. 1 (data modifications on the block devices marked as read-only) and Fig. 2-3 (data modifications on the block device with the journal not protected by a read-only loop device).

Fig. 1
Fig. 1

Fig. 2
Fig. 2

Fig. 3
Fig. 3

Grml 2014.11

Grml 2014.11 includes the kernel patch available in this repository along with their own userspace tools to mark block devices as read-only (in the Forensic Mode). When block devices are marked as read-only, no data modifications from file system drivers are allowed by Grml 2014.11, and an error code recorded in the journal of the Ext4 file system will not be transferred to the primary superblock (Fig. 4).

Fig. 4
Fig. 4