How to set the default root password
By default on buildroot there is no password for root user. It is not really secure and can be a problem for some packages like dropbear. This page explain how to set a default password on our board.
The straitforward way to set the root password is to login on the board then type :
# passwd Changing password for root New password: Bad password: too short Retype password: Password for root changed by root
If your password seems to be too simple for the system it will tell it, but the password is changed.
If we have a big production of APF* to flash with the same default password it will be really painfull to change it on each boards. The best way is then to change it under your rootfs.
- First we need the debian/ubuntu package whois (wich is installed by default). Then generate the crypted password :
$ mkpasswd Mot de passe : 3DHrA1GdEo2u6
The hash for password 'toto' is generated. Then we have to put it in our shadow file under rootfs. To do that, edit your file buildroot/output/target/etc/shadow, and replace the line:
If you prefer bearded commands you can also type :
sed -i ’s%^root::%root:3DHrA1GdEo2u6:%’ $TARGETDIR/buildroot/output/target/etc/shadow
- Then regenerate your rootfs.
- You will then need a password for root when you will run your board.