Date: Sat, 06 Dec 1997 21:54:01 +0000 From: Brian Somers <brian@awfulhak.org> To: Evan Champion <evanc@synapse.net> Cc: freebsd-current@freebsd.org Subject: Re: _POSIX_SAVED_IDS Message-ID: <199712062154.VAA00144@awfulhak.demon.co.uk> In-Reply-To: Your message of "Sat, 06 Dec 1997 10:11:35 EST." <Pine.BSF.3.96.971206094940.221A-100000@cello.synapse.net>
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> I was compiling a program (Kerberos 5) on BSD/OS a couple days ago and
> found that I was running in to trouble because BSDI's setreuid() doesn't
> work very well (it seems that once you get to root, you can't switch to
> another user), so just for kicks I decided to go compare the BSDI
> setreuid() with the one from FreeBSD.
>
> Anyway, along the way I found that kern/kern_prot.c seems to be fully
> loaded with #ifdefs for _POSIX_SAVED_IDS, but _POSIX_SAVED_IDS is not
> defined by default.
>
> Is it just because not everything is up to handling a saved-id setuid()?
AFAIK, setreuid() doesn't use saved ids - setreuid() should only be
used to swap your euid and uid. Disclaimer - this is an assumption,
I may be wrong.
However, seteuid() works ok for me (/usr/src/usr.sbin/ppp/id.c),
which implies that saved uids are functional.
> Evan
>
--
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <brian@OpenBSD.org>
<http://www.Awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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