linux-kernel - Re: One process with multiple user ids.

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Message-Id: <200710021334.34950.gogi-k@gogi.tv>
Date:	Tue, 2 Oct 2007 13:34:34 +0200
From:	Giuliano Gagliardi <gogi-k@...i.tv>
To:	linux-kernel@...r.kernel.org
Subject: Re: One process with multiple user ids.

On Tuesday 02 October 2007, Jan Engelhardt wrote:
> On Oct 2 2007 12:56, Giuliano Gagliardi wrote:
> >I have a server that has to switch to different user ids, but because it
> > does other complex things, I would rather not have it run as root. I only
> > need the server to be able to switch to certain pre-defined user ids.
>
> All you need is CAP_SETUID. Also see man setresuid,
> where you could, I think, use saved_uid=0 if you do not
> like to use real_uid=0 effective_uid=non-0.

But CAP_SETUID would let me change to any uid, would it not? I would like my 
process to have no possibility to change to any uid, except some predefined 
set, so that in case of a security hole only those uids could be compromised.
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