From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752167AbeBAWqR (ORCPT ); Thu, 1 Feb 2018 17:46:17 -0500 Received: from mail-vk0-f65.google.com ([209.85.213.65]:44260 "EHLO mail-vk0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751976AbeBAWqK (ORCPT ); Thu, 1 Feb 2018 17:46:10 -0500 X-Google-Smtp-Source: AH8x226vlIgrUrK41s6afDWPRxZLWk9oqMaKPSoqsSvQFhVRX6+dAtaImmn/XxScga3wojhHITDvAw== Subject: Re: [RFC PATCH] rootfs: force mounting rootfs as tmpfs To: Mimi Zohar , Arvind Sankar Cc: initramfs , Taras Kondratiuk , Victor Kamensky , linux-security-module , Al Viro , linux-kernel References: <1517348777.3469.5.camel@linux.vnet.ibm.com> <1814af5c-170d-39c0-58fd-02eb7216e008@landley.net> <1517436423.3469.237.camel@linux.vnet.ibm.com> <20180201020331.GA3774@rani.riverdale> <1517458921.3329.2.camel@linux.vnet.ibm.com> From: Rob Landley Message-ID: Date: Thu, 1 Feb 2018 16:46:07 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <1517458921.3329.2.camel@linux.vnet.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/31/2018 10:22 PM, Mimi Zohar wrote: > On Wed, 2018-01-31 at 21:03 -0500, Arvind Sankar wrote: >> On Wed, Jan 31, 2018 at 05:48:20PM -0600, Rob Landley wrote: >>> On 01/31/2018 04:07 PM, Mimi Zohar wrote: >>>> On Wed, 2018-01-31 at 13:32 -0600, Rob Landley wrote:>> (The old "I configured in tmpfs and am using rootfs but I want that >>> rootfs >>>>> to be ramfs, not tmpfs" code doesn't seem to be a real-world concern, does >>>>> it?) >>>> >>>> I must be missing something.  Which systems don't specify "root=" on >>>> the boot command line. >>> >>> Any system using initrd or initramfs? >>> >> >> Don't a lot of initramfs setups use root= to tell the initramfs which >> actual root file system to switch to after early boot? > > With your patch and specifying "root=tmpfs", dracut is complaining: > > dracut: FATAL: Don't know how to handle 'root=tmpfs' > dracut: refusing to continue "The kernel can't break this buggy userspace package." "The kernel must give access to a new feature to this buggy userspace package". I think kernel policy asks you to pick one, but I could be wrong... Rob