From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 43735C4320A for ; Mon, 30 Aug 2021 16:56:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 206DD60F12 for ; Mon, 30 Aug 2021 16:56:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237939AbhH3Q5C (ORCPT ); Mon, 30 Aug 2021 12:57:02 -0400 Received: from mslow1.mail.gandi.net ([217.70.178.240]:37631 "EHLO mslow1.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237836AbhH3Q5B (ORCPT ); Mon, 30 Aug 2021 12:57:01 -0400 Received: from relay9-d.mail.gandi.net (unknown [217.70.183.199]) by mslow1.mail.gandi.net (Postfix) with ESMTP id 3C85AC655E; Mon, 30 Aug 2021 16:56:06 +0000 (UTC) Received: (Authenticated sender: thomas.petazzoni@bootlin.com) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id A31E1FF809; Mon, 30 Aug 2021 16:55:42 +0000 (UTC) Date: Mon, 30 Aug 2021 18:55:41 +0200 From: Thomas Petazzoni To: Pintu Agarwal Cc: Mikulas Patocka , open list , Phillip Lougher , linux-fsdevel , linux-mtd , dm-devel@redhat.com, Kernelnewbies , agk@redhat.com, snitzer@redhat.com, Sami Tolvanen Subject: Re: Kernel 4.14: Using dm-verity with squashfs rootfs - mounting issue Message-ID: <20210830185541.715f6a39@windsurf> In-Reply-To: References: Organization: Bootlin X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Mon, 30 Aug 2021 21:55:19 +0530 Pintu Agarwal wrote: > Sorry for coming back to this again.. > Unfortunately, none of the options is working for us with squashfs > (bootloader, initramfs). > initramfs have different kinds of challenges because of the partition > size issue. > So, our preferred option is still the bootloader command line approach.. > > Is there a proven and working solution of dm-verity with squashfs ? > If yes, please share some references. > > The current problem with squashfs is that we could not append the > verity-metadata to squashfs, so we store it on a separate volume and > access it. Here, it definitely worked to append the hash tree to the squashfs image and store them in the same partition. > By specifying it like : /dev/mtdblock53 > > Then we get the error like this: > { > [ 4.950276] device-mapper: init: attempting early device configuration. > [ 4.957577] device-mapper: init: adding target '0 95384 verity 1 > /dev/ubiblock0_0 /dev/mtdblock53 4096 4096 11923 8 sha256 > 16da5e4bbc706e5d90511d2a3dae373b5d878f9aebd522cd614a4faaace6baa3 > aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 10 > restart_on_corruption ignore_zero_blocks use_fec_from_device > /dev/mtdblock53 fec_roots 2 fec_blocks 12026 fec_start 12026' > [ 4.975283] device-mapper: verity: sha256 using implementation > "sha256-generic" > [ 4.998728] device-mapper: init: dm-0 is ready Could you show the full kernel command line ? > Do you see any other problem here with dm-verity cmdline or with squashfs ? > > Is squashfs ever proved to be working with dm-verity on higher kernel version ? > Currently our kernel version is 4.14. I confirm we used squashfs on dm-verity successfully. For sure on 4.19, perhaps on older kernels as well. > Or, another option is to use the new concept from 5.1 kernel that is: > dm-mod.create = ? How are you doing it today without dm-mod.create ? Again, please give your complete kernel command line. Best regards, Thomas -- Thomas Petazzoni, co-owner and CEO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com