### BEGIN 01_user_list ###
set superusers='xxuser_namexx'
password_pbkdf2 xxuser_namexx grub.pbkdf2.sha512.3.DC0E03A0DB4....
### END 01_user_list ###
These file "01_user_list" will be added into the grub.cfg during "sudo update-grub".
The file /boot/grub/grub.cfg contains two linux-kernel (see attachement)
-> the up_to_date 2.6.38-3 kernel
-> the backup-kernel 2.6.37-12
The later one ist put into the brackets and will be selected inside the grub-menu via the sub-menu option!
Selecting the 2.6.38-3-kernel first, all will be working fine - asking for user_name and passwort, if you try to use the keys "C" or "E"!!
Selecting the sub-menu first and after the previous kernel is shown, you can select inside these sub-menu the keys "C" or "E" without any authorization is nessassary, to use these two options - YOU CAN MANIPULATE ALL!!!
I provided a password-file containing:
### BEGIN 01_user_list ### 'xxuser_ namexx' sha512. 3.DC0E03A0DB4. ...
set superusers=
password_pbkdf2 xxuser_namexx grub.pbkdf2.
### END 01_user_list ###
These file "01_user_list" will be added into the grub.cfg during "sudo update-grub".
The file /boot/grub/grub.cfg contains two linux-kernel (see attachement)
-> the up_to_date 2.6.38-3 kernel
-> the backup-kernel 2.6.37-12
The later one ist put into the brackets and will be selected inside the grub-menu via the sub-menu option!
Selecting the 2.6.38-3-kernel first, all will be working fine - asking for user_name and passwort, if you try to use the keys "C" or "E"!!
Selecting the sub-menu first and after the previous kernel is shown, you can select inside these sub-menu the keys "C" or "E" without any authorization is nessassary, to use these two options - YOU CAN MANIPULATE ALL!!!