[Buildroot] Unable to login as root to new buildroot system

[Stanislav Vlasic <svlasic@gmail.com>]

Hi,

On 07/25/2015 02:25 AM, Adam Baxter wrote:
> I'm using the latest Git version of buildroot and the following config -
> https://github.com/voltagex/serial-vm-buildroot
>
> It builds and boots with qemu just fine, but no matter what combination
> of getty/no getty/shell/root password I use, I can't login. Even with a
> blank root password I'm told that the password is incorrect, and I can't
> work out how to make it boot straight to a root prompt.
>
> Can anyone help? The repo above should be able to be built with make
> serial_defconfig, but if there's still hardcoded paths to a 'voltagex'
> or 'ubuntu' user you'll have to let me know how to remove them.
>
> I've read
> http://lists.busybox.net/pipermail/buildroot/2012-July/056177.html and
> similar threads found by googling "buildroot root login"
>
> Regards,
> Adam Baxter
>
>
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Try edit system/skeleton/etc/passwd file (or overlay one if you're using 
overlays) and replace 1st line:

root:x:0:0:root:/root:/bin/sh

with:

root::0:0:root:/root:/bin/sh

Never had that problem on Buildroot, but did on Ubuntu Core rootfs and 
this method fixed it.