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[2620:137:e000::1:20]) by mx.google.com with ESMTP id k11-20020a170906128b00b0073d5a794b43si2393277ejb.985.2022.12.16.12.55.57; Fri, 16 Dec 2022 12:56:24 -0800 (PST) Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=M08Tp1Nd; spf=pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230478AbiLPUzZ (ORCPT + 99 others); Fri, 16 Dec 2022 15:55:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229742AbiLPUzW (ORCPT ); Fri, 16 Dec 2022 15:55:22 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4A8F57B6B; Fri, 16 Dec 2022 12:55:21 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4B1D562203; Fri, 16 Dec 2022 20:55:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72201C433F0; Fri, 16 Dec 2022 20:55:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1671224120; bh=Xwcytn+LoirjjEGfFRYRfniLWhHW1mgnIB+bcrZQfrA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=M08Tp1Nd4FaewBLlMg7sBZRj6HV+oopMEURtYwNlMRbz4VjYPGQ/qCd+W7pemHb9x 0vUAuy1Cm5dVMIp7PhWEbp3itnRVeJ8KeYxDynKo1QWtmJpOOpqen99iyVERF4PyCy oJBXgXdmZPg3XQxLDaOp/X/scQDEVUl2ugeJiVkCVxSWEW1BvHV2yI/r6mFjbA+fG/ plymEurGnXR0A74q+mivvOnbm7dVuUbtTHVGlbx8uzOuB2diLWpC1T6gWiLeor9b2i ytVWVHlC5efZgfm3nV1xYO9dH6BFQe8jnpcK75vuWSIFj9v42UjwXXru4GKqdoIA9h xkNZ64Qu9aIsQ== Date: Fri, 16 Dec 2022 12:55:18 -0800 From: Eric Biggers To: Luca Boccassi Cc: linux-fscrypt@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-btrfs@vger.kernel.org, linux-integrity@vger.kernel.org, Jes Sorensen , Victor Hsieh Subject: Re: [PATCH] fsverity: mark builtin signatures as deprecated Message-ID: References: <20221208033548.122704-1-ebiggers@kernel.org> <00c7b6b0e2533b2bf007311c2ede64cb92a130db.camel@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00c7b6b0e2533b2bf007311c2ede64cb92a130db.camel@debian.org> X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Thu, Dec 08, 2022 at 09:37:29PM +0000, Luca Boccassi wrote: > > The second question is easy: because the kernel is the right place for > our use case to do this verification and enforcement, exactly like dm- > verity does. Well, dm-verity's in-kernel signature verification support is a fairly new feature. Most users of dm-verity don't use it, and will not be using it. > Userspace is largely untrusted, or much lower trust anyway. Yes, which means the kernel is highly trusted. Which is why parsing complex binary formats, X.509 and PKCS#7, in C code in the kernel is not a great idea... - Eric