As the subject says, I managed to overwrite the
busybox program on my OpenWrt 21.02.2 device. I'm able to boot into recovery mode, but running
mount_root makes the system unusable.
I need a way to modify the overlay filesystem without mounting it as the root filesystem, so that I can restore the correct
Can anyone think of a way to do this?
In failsafe mode, identify the
# cat /proc/mtd
dev: size erasesize name
mtd0: 00020000 00010000 "u-boot"
mtd1: 00fd0000 00010000 "firmware"
mtd2: 001f46b5 00010000 "kernel"
mtd3: 00ddb948 00010000 "rootfs"
mtd4: 00a60000 00010000 "rootfs_data"
mtd5: 00010000 00010000 "art"
Make a directory for it, and mount it.
# mkdir /tmp/root_data
# mount -t jffs2 /dev/mtdblock4 /tmp/root_data
I just needed to restore
busybox to the version included in OpenWrt, so all I had to do was remove the "overlay" version.
# rm /tmp/root_data/upper/bin/busybox
With that done, I was able to unmount the
root_data device, run
mount_root to confirm that things were back to normal, and reboot.
# umount /tmp/root_data
<Check things out>
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