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Re: pre-login fun

This behavior is normal: the login shell runs with no uids and no
gids, however, this does not means that it has absolutely no
permission on the system (at the very minimum, it has access to the
CPU, memory and a tty, thus, why not disk space too).  In a default
installation of GNU, the S_IUSEUNK bit is unset.  This means that
unknown users should be treated as other users and not use their own
triplet, S_IUNKNOWN, when checking access rights.

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