This tool can be used to view or extract the contents of UBIFS images.
UBIFS is a filesystem specifically designed for used on NAND flash chips. NAND flash is organized in eraseblocks. Eraseblocks can be erased, appended to, and read. Erasing is a relatively expensive operation, and can be done only a limited number of times.
An UBIFS image contains four abstraction layers:
- b-tree nodes
Each eraseblock contains info on how often it has been erased, and which volume it belongs to. A volume contains a b-tree database with keys for:
- inodes, indexed by inode number
- direntries, indexed by inode number + name hash
- datablocks, indexed by inode number + block number
The inodes are basically a standard unix filesystem, with direntries, regular files, symlinks, devices, etc.
mounting images on linux
modprobe nandsim first_id_byte=0x2c second_id_byte=0xac third_id_byte=0x90 fourth_id_byte=0x26 nandwrite /dev/mtd0 firmware-image.ubi modprobe ubi mtd=/dev/mtd0,4096 mount -t ubifs -o ro /dev/ubi0_0 mnt
This will mount a ubi image for a device with eraseblock size 0x40000.
If your image has a blocksize of 0x20000, use
fourth_id_byte=0x15, and specify a pagesize of
with the second modprobe line.
View the contents of the
/etc/passwd file in the filesystem image
python ubidump.py -c /etc/passwd image.ubi
List the files in all the volumes in
python ubidump.py -l image.ubi
View the contents of b-tree database from the volumes in
python ubidump.py -d image.ubi
- add option to select a volume
- add option to select a older
- parse the journal
- analyze b-tree structure for unused nodes
- analyze fs structure for unused inodes, dirents
- verify that data block size equals the size mentioned in the inode.
- add support for ubifs ( without the ubi layer )
- another python tool on github
- does not support listing files.
- a closed source windows tool here
- ubi-utils/ubidump.c on the mtd mailinglist
Willem Hengeveld email@example.com