Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752143AbZIRGHW (ORCPT ); Fri, 18 Sep 2009 02:07:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751645AbZIRGHV (ORCPT ); Fri, 18 Sep 2009 02:07:21 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:35058 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751346AbZIRGHS (ORCPT ); Fri, 18 Sep 2009 02:07:18 -0400 Date: Thu, 17 Sep 2009 22:58:44 -0700 From: Greg KH To: Ingo Molnar Cc: Linus Torvalds , Kay Sievers , "Eric W. Biederman" , linux-kernel@vger.kernel.org Subject: Re: [bug] /etc/profile: line 30: /dev/null: Permission denied (Was: Re: [PATCH] Remove broken by design and by implementation devtmpfs maintenance disaster) Message-ID: <20090918055843.GB7104@kroah.com> References: <20090917125759.GA4045@kroah.com> <20090917185306.GA28635@elte.hu> <20090917203113.GA9530@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090917203113.GA9530@elte.hu> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2261 Lines: 54 On Thu, Sep 17, 2009 at 10:31:13PM +0200, Ingo Molnar wrote: > > * Linus Torvalds wrote: > > > On Thu, 17 Sep 2009, Kay Sievers wrote: > > > > > On Thu, Sep 17, 2009 at 20:53, Ingo Molnar wrote: > > > > I've reproduced a bug with the following .config options: > > > > > > > > ??CONFIG_DEVTMPFS=y > > > > ??CONFIG_DEVTMPFS_MOUNT=y > > > > > > > > /dev/null and /dev/zero are not read/writable to ordinary users, > > > > breaking normal bootup and login: > > > > > > Udev should run long before some ordinary/non-root user can login, > > > and apply the permissions as it always does. It's known to work on > > > Fedora, SUSE, Ubuntu. What kind of system/environment/setup is that > > > where you see this? > > > > I don't know if this is what Ingo does, but I have a few machines > > where I don't run the distro-supplied 'initrd' at all, because it's > > easier to boot without it. The Fedora initrd doesn't allow me to > > sanely set root filesystem parameters without totally rewriting the > > initrd image, which I'm not interested in, for example (they'll take > > effect for the root initrd, not the final root). > > Correct: i'm booting raw bzImages, with /dev copied to the real /dev. To > this box udev is mostly an annoyance that slows down my bootup ;-) I use non-initrd systems as well, and this option works for me on Gentoo and SUSE machines. As you are using a very old udev, and the boot infrastructure for udev in older Fedora releases was a bit "odd" in places, I would recommend not using these options on that machine. If we need to reword the Kconfig help option to make it a bit more clear, do you have a suggestion on what we should change? > Furthermore, this is a really old image, Fedora Core 6, where udev does > not get updated anymore. I still boot new kernels on it though, and it > worked fine up to now. It should continue to work if you don't select this option, right? The default is "N" :) thanks, greg k-h -- 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/