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 331D9C4320A for ; Mon, 30 Aug 2021 20:17:10 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C84A660F5B for ; Mon, 30 Aug 2021 20:17:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C84A660F5B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94.2) (envelope-from ) id 1mKnhk-0005xD-G1; Mon, 30 Aug 2021 16:16:28 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mKkZX-0001ou-OY for kernelnewbies@kernelnewbies.org; Mon, 30 Aug 2021 12:55:47 -0400 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 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 X-Mailman-Approved-At: Mon, 30 Aug 2021 16:16:21 -0400 Cc: Sami Tolvanen , snitzer@redhat.com, Kernelnewbies , open list , dm-devel@redhat.com, Mikulas Patocka , linux-mtd , linux-fsdevel , Phillip Lougher , agk@redhat.com X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kernelnewbies-bounces@kernelnewbies.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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies