Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261750AbVASPji (ORCPT ); Wed, 19 Jan 2005 10:39:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261754AbVASPje (ORCPT ); Wed, 19 Jan 2005 10:39:34 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:37611 "EHLO atrey.karlin.mff.cuni.cz") by vger.kernel.org with ESMTP id S261750AbVASPjX (ORCPT ); Wed, 19 Jan 2005 10:39:23 -0500 Date: Wed, 19 Jan 2005 13:56:18 +0100 From: Pavel Machek To: Linus Torvalds Cc: Dave Jones , Andrew Morton , marcelo.tosatti@cyclades.com, Greg KH , chrisw@osdl.org, Alan Cox , Kernel Mailing List Subject: Re: thoughts on kernel security issues Message-ID: <20050119125618.GA476@openzaurus.ucw.cz> References: <20050112185133.GA10687@kroah.com> <20050112161227.GF32024@logos.cnet> <20050112205350.GM24518@redhat.com> <20050112182838.2aa7eec2.akpm@osdl.org> <20050113033542.GC1212@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.27i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 977 Lines: 25 Hi! > > For us thankfully, exec-shield has trapped quite a few remotely > > exploitable holes, preventing the above. > > One thing worth considering, but may be abit _too_ draconian, is a > capability that says "can execute ELF binaries that you can write to". > > Without that capability set, you can only execute binaries that you cannot > write to, and that you cannot _get_ write permission to (ie you can't be > the owner of them either - possibly only binaries where the owner is > root). Well, if there's gdb installed on such machine, you can probably circumvent this. Hmm, you can probably do /lib/ld-linux.so.2 your binary, no? Pavel -- 64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms - 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/