[U-Boot] change root password
hi,
How can I change root password??
I try this:
1) stop u-boot and add "init=/bin/sh" to the bootargs variable; 2) boot 3) passwd -d root (inside shell)
but this doesn't work!!!! When I reboot the machine, I cannot login with a new password.
Thanks, Nuno Cardoso.
Le 04/05/2010 12:48, Nuno Cardoso a écrit :
hi,
How can I change root password??
I try this:
- stop u-boot and add "init=/bin/sh" to the bootargs variable;
- boot
- passwd -d root (inside shell)
but this doesn't work!!!! When I reboot the machine, I cannot login with a new password.
Thanks, Nuno Cardoso.
This is not a U-boot issue; this is an issue with the operating system (at large) to which U-boot transfers control. If you are the designer of the OS, then you're basically the boss and you should check why your permanent storage does not keep the new password; if you use a predesigned OS, turn to the designers for assistance.
Amicalement,
Hi Nuno,
How can I change root password??
I try this:
- stop u-boot and add "init=/bin/sh" to the bootargs variable;
- boot
- passwd -d root (inside shell)
but this doesn't work!!!! When I reboot the machine, I cannot login with a new password.
There really is no need to shout.
What do you mean with "new password"? The -d has deleted the password, so you should use no password at all. On the other hand, the "root" user not having any password may be forbidden by the rest of the filesystem, so I would rather try to use "passwd root" and set a known password and try again.
Cheers Detlev
When I change the root password I'm using the command that you specify "passwd root" and enter a new password. After that, I execute the "exec init" command in U-Boot shell to boot all the linux system. At login, I put the new password, but I cannot log!!!!!
After a restart, I stop the u-boot process to start shell (init=/bin/sh) and cat the /etc/shadow file, and the root password doesn't change (is the old). What I'm doing wrong?
Thanks, Nuno Cardoso.
2010/5/4 Detlev Zundel dzu@denx.de
Hi Nuno,
How can I change root password??
I try this:
- stop u-boot and add "init=/bin/sh" to the bootargs variable;
- boot
- passwd -d root (inside shell)
but this doesn't work!!!! When I reboot the machine, I cannot login with
a
new password.
There really is no need to shout.
What do you mean with "new password"? The -d has deleted the password, so you should use no password at all. On the other hand, the "root" user not having any password may be forbidden by the rest of the filesystem, so I would rather try to use "passwd root" and set a known password and try again.
Cheers Detlev
-- The success of PCs is in large part due to the fact that, by making all hardware equivalent, good software enabled bad hardware. (Ugly) -- Rob Pike -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu@denx.de
Dear Nuno Cardoso,
In message x2j3cf2debb1005060055w943eecd4t9a87659b0badf2e@mail.gmail.com you wrote:
When I change the root password I'm using the command that you specify "passwd root" and enter a new password. After that, I execute the "exec init" command in U-Boot shell to boot all the linux system. At login, I put the new password, but I cannot log!!!!!
After a restart, I stop the u-boot process to start shell (init=/bin/sh) and cat the /etc/shadow file, and the root password doesn't change (is the old). What I'm doing wrong?
Probably you are missing a step to write the changes to the password data back to some persistent storage; when re-booting, you are re-loading the old, unmodified data.
We don't know your system and it's file system layout. We don't know if it provides any form of persistent, changable storage for these data, and where.
When booting with init=/bin/sh the whole system is at your hands - explore it and find out.
Eventually the data is in a read-only file system and cannot be changed at all - then you can try to upload the file system image, undpack it, modify it, repack it and install it on your target. Of course there is a chance that you brick the system that way, so you better know exactly what you are doing.
We do not know your systeme. We CANNOT help you. And all this is off topic here.
Best regards,
Wolfgang Denk
participants (4)
-
Albert ARIBAUD -
Detlev Zundel -
Nuno Cardoso -
Wolfgang Denk