Setuid binaries and File Ownerships in FreeBSD9.0
Robert Bonomi
bonomi at mail.r-bonomi.com
Wed Jan 23 21:53:54 UTC 2013
> From: Martin McCormick <martin at dc.cis.okstate.edu>
> To: FreeBSD Questions <freebsd-questions at 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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