Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756479AbXJBLei (ORCPT ); Tue, 2 Oct 2007 07:34:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753994AbXJBLeb (ORCPT ); Tue, 2 Oct 2007 07:34:31 -0400 Received: from sovereign.computergmbh.de ([85.214.69.204]:43678 "EHLO sovereign.computergmbh.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754308AbXJBLea (ORCPT ); Tue, 2 Oct 2007 07:34:30 -0400 Date: Tue, 2 Oct 2007 13:34:29 +0200 (CEST) From: Jan Engelhardt To: Giuliano Gagliardi cc: Linux Kernel Mailing List Subject: Re: One process with multiple user ids. In-Reply-To: <200710021333.05826.gogi-k@gogi.tv> Message-ID: References: <200710021256.08469.gogi-k@gogi.tv> <200710021333.05826.gogi-k@gogi.tv> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1265 Lines: 30 On Oct 2 2007 13:33, Giuliano Gagliardi wrote: >Date: Tue, 2 Oct 2007 13:33:05 +0200 >From: Giuliano Gagliardi >To: Jan Engelhardt >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. > > You could write up a LSM that restricts UID changing. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/