UPDATE: This only applies to original default passwords, which use 8-character DES encryption. Any passwords changed with the "passwd" command use MD5 encryption that hashes all the password characters.
For kindle default login passwords (SSH, scp or serial port logins), the passwords are truncated to 8 characters.
That means that when I said in the past that passwords are mario or fionaXXX (3 lowercase hex digits), I was correct.
Of course, you can type as many extra random characters as you need to make you happy.
On some kindles, the root password is mario. On all of the kindles I have tested, there is also a framework user, with password mario.
So if you need to login and your root password is not working, you can login as user framework and get the root password with this command:
echo fiona$(grep Serial /proc/cpuinfo|cut -b12-27|md5sum|cut -b8-10)
Code:
$ ssh framework@192.168.15.244
framework@192.168.15.244's password: mario
#################################################
# N O T I C E * N O T I C E * N O T I C E #
#################################################
Rootfs is mounted read-only. Invoke mntroot rw to
switch back to a writable rootfs.
#################################################
[framework@kindle framework]$ echo fiona$(grep Serial /proc/cpuinfo|cut -b12-27|md5sum|cut -b8-10)
fiona62b
[framework@kindle framework]$ exit
$ ssh root@192.168.15.244
root@192.168.15.244's password: fiona62b
#################################################
# N O T I C E * N O T I C E * N O T I C E #
#################################################
Rootfs is mounted read-only. Invoke mntroot rw to
switch back to a writable rootfs.
#################################################
[root@kindle root]# exit
$ ssh root@192.168.15.244
root@192.168.15.244's password: fiona62bhello
#################################################
# N O T I C E * N O T I C E * N O T I C E #
#################################################
Rootfs is mounted read-only. Invoke mntroot rw to
switch back to a writable rootfs.
#################################################
[root@kindle root]#