Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!killer!rpp386!spdyne!root
From: root@spdyne.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: setuid (euid) after setuid (uid) on
Message-ID: <1800009@spdyne>
Date: 26 Mar 89 00:31:00 GMT
References: <123@cat.Fulcrum.BT.CO.UK>
Lines: 20
Nf-ID: #R:cat.Fulcrum.BT.CO.UK:123:spdyne:1800009:000:685
Nf-From: spdyne.UUCP!root    Mar 25 18:31:00 1989


In article <1196@auspex.UUCP> guy@auspex.UUCP (Guy Harris) writes:
>Both BSD and S5 flavors of "setuid" can be implemented atop "setreuid".

How about:

    setuid (id);                /* old method, not of much use... */

    setruid (real uid);         /* ONLY change the real uid */
    seteuid (Eff uid);          /* ONLY change the effective uid */
    setsuid (Saved - Set-uid);  /* ONLY change the saved set-uid */


This would enable people to write easy to follow, easy to write programs
that run setuid and do I/O that runs as the original user.  None of this
Junk about root being special...


    -Chert Pellett
     root@spdyne.... Or chert@spdyne if you are setuid...:-)