shadow/man/login.defs.d/DEFAULT_HOME.xml

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<varlistentry>
  <term><option>DEFAULT_HOME</option> (boolean)</term>
  <listitem>
    <para>
      Indicate if login is allowed if we can't cd to the home directory.
      Default is no.
    </para>
    <para>
      If set to <replaceable>yes</replaceable>, the user will login in
      the root (<filename>/</filename>) directory if it is not possible to
      cd to her home directory.
    </para>
  </listitem>
</varlistentry>