From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxim Kochetkov <fido_max@inbox.ru>
Date: Mon, 28 Jun 2021 12:06:31 +0300
Subject: [Buildroot] Question on users and ssh access
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References: <82f467ec-fbb3-9e87-be88-b5b51fc9b632@microchip.com>
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To: buildroot@busybox.net

28.06.2021 11:55, Eugen.Hristev--- via buildroot wrote:
> Hello everyone,
> 
> Maybe you can help me with a small matter related to user accounts in
> Buildroot ?
> 
> By default the /home directory does not exist, thus when using adduser
> to create a user, the creation of /home/foo fails ... and this causes
> login with ssh to the user impossible due to lack of home dir.
> 
> Any recommendation on how to solve this ? It is preferred to set a
> password for root for ssh access (as root has /root as home) ? or add a
> post-script to create the /home in the rootfs ?
> 
> Thanks !
> Eugen
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> 

Try this:
https://buildroot.org/downloads/manual/manual.html#customize-users