JFFS2
From Leo's Notes
Last edited on 1 October 2022, at 21:17.
Journaling Flash File System version 2 is a filesystem used with flash memory devices. This is usually found within firmware files and can be detected by binwalk.
Extracting JFFS2 data
Most major distros should support JFFS2 already. You may however still need to install the MTD utilities.
# yum -y install mtd-utils
The simplest way to extract contents from a JFFS2 filesystem is to create a virtual flash device and then mount it.
# modprobe mtdram total_size=32768 erase_size=256
# modprobe mtdblock
## Verify
# mtdinfo
# mtdinfo /dev/mtd0
## Copy your image and mount it for extraction
# dd if=extracted.bin of=/dev/mtdblock0
# mount -t jffs2 -o ro /dev/mtdblock0 /mnt/disk
To clean up, just umount the directory and rmmod mtdram.
# umount /mnt/disk
# rmmod mtdram