Date: Wed, 23 Jan 2013 15:57:24 -0600 (CST) From: Robert Bonomi <bonomi@mail.r-bonomi.com> To: freebsd-questions@freebsd.org, martin@dc.cis.okstate.edu Subject: Re: Setuid binaries and File Ownerships in FreeBSD9.0 Message-ID: <201301232157.r0NLvOir062346@mail.r-bonomi.com> In-Reply-To: <201301232026.r0NKQGqF070301@x.it.okstate.edu>
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> From: Martin McCormick <martin@dc.cis.okstate.edu> > To: FreeBSD Questions <freebsd-questions@freebsd.org> > Subject: Setuid binaries and File Ownerships in FreeBSD9.0 > Date: Wed, 23 Jan 2013 14:26:16 -0600 > [[.. sneck ..]] > When the application first runs, it gets the UID and GID > of the user and uses > > setuid(heruid); and setgid(hergid); to temporarily downgrade and > those files are owned by the right user but setuid(0); doesn't > appear to upgrade back to root. > > Is there any other strategy that gets one back to root > short of using chown and then a system call and never > downgrading privilege? man setEuid
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