newgrp implementation for review

"Tim J. Robbins" <[email protected]>
Newsgroups gmane.os.freebsd.devel.audit
Message-ID <[email protected]> 
I'd appreciate it if people could review my implementation of newgrp(1),
which runs suid root, for possible security flaws:
	http://people.freebsd.org/~tjr/newgrp.shar

It will only get installed suid root if ENABLE_NEWGRP=true is specified in
/etc/make.conf because most people won't need it. newgrp is required by
POSIX.2 Amd. 1 (User Portability Extension).

Thanks,

Tim

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