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=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_MED,USER_IN_DEF_DKIM_WL autolearn=ham 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 990CCC282CE for ; Tue, 4 Jun 2019 20:05:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6AF7E2070B for ; Tue, 4 Jun 2019 20:05:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="pv/6OPT1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726269AbfFDUF6 (ORCPT ); Tue, 4 Jun 2019 16:05:58 -0400 Received: from mail-it1-f194.google.com ([209.85.166.194]:37997 "EHLO mail-it1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726211AbfFDUF5 (ORCPT ); Tue, 4 Jun 2019 16:05:57 -0400 Received: by mail-it1-f194.google.com with SMTP id h9so28603itk.3 for ; Tue, 04 Jun 2019 13:05:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ZREhuJlsDtH89ZVDYphzf41RLCVZZkM936cBZurEuKE=; b=pv/6OPT1BwcW5kLEBR+t89bzJ6UremuUyrRRzifMONzXagldwUIj4ryQti4Jce45X3 YEqlt80vgw/1s9GumZrTUbCOUG1NmsmW6pUOoHe9r1iHLbpAPBsMiCQti4XuzcoymGTf yRK4Yp32kJT1dNc4oAtYkpiMcmE6Y3X7yQXCgUTLsgrsSA7TI8MEz14fbjA3EbNcjAlY 2idbOTzsQd664g8fX2JJ8XhDoeqMwDy4YUdEwBa5PaQXDZn8oJjRkRjkseIlZr4mFJto QT6ZqnKS7YsQaium2oEVGTjkIDxej2XHbJmZ/VKarQFFIw/oW3HevHdtuWUbxY+c7WM1 NCVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ZREhuJlsDtH89ZVDYphzf41RLCVZZkM936cBZurEuKE=; b=XVuJ/QSysZi0Ak7y9T1ZRYU055HylW48JXhGRuQnY0co+J/JWsOaBOUOrT7sLV0zW+ Am17QiExA32ObNJ6msDCm77aJII/RxriNaDVucacogMotorsGVaW1XOFILUYQ9SI3k3N fBEOg3PCB4ylj2B0TlvG/TEtFCGYW0KMfEIAJFSQheHEe+FsegyGjkwEvNManO0S4wXT idiKbpexRDw1ZSsPpXY9Hv6VmnDXMtbq2KjcuwlpwDQ0qwhGsNLPKrFpb6OqA14Fg1IN QSIg0ltxI0EpIG2K2OYilcxSAHaHzIv4qyCLk5aJfLURT/U9wsC292Endg9qREtrTQDu ta+g== X-Gm-Message-State: APjAAAU7os6tGU61puRd3R4VPLJr4EkQOXYtcFabdsuv5wSanznj8YgH JM5xFmJdBuIiFebCvQvsTfYfNNYXldX5+o6CyUjhMA== X-Google-Smtp-Source: APXvYqwsa9hUdLg9OFkrqEiChjF1ClMm07RxLnCex43+ESQGujO4p+QXESe0Hiljy+pNbzZoo6W0gnVr8MJ1YwSahpo= X-Received: by 2002:a24:bd4:: with SMTP id 203mr22280225itd.119.1559678756641; Tue, 04 Jun 2019 13:05:56 -0700 (PDT) MIME-Version: 1.0 References: <20190520062553.14947-1-dja@axtens.net> <316a0865-7e14-b36a-7e49-5113f3dfc35f@linux.vnet.ibm.com> <87zhmzxkzz.fsf@dja-thinkpad.axtens.net> <20190603072916.GA7545@kroah.com> <87tvd6xlx9.fsf@dja-thinkpad.axtens.net> In-Reply-To: From: Matthew Garrett Date: Tue, 4 Jun 2019 13:05:45 -0700 Message-ID: Subject: Re: [WIP RFC PATCH 0/6] Generic Firmware Variable Filesystem To: Nayna Cc: Daniel Axtens , Greg KH , linux-fsdevel@vger.kernel.org, Nayna Jain , linuxppc-dev , Claudio Carvalho , George Wilson , Mimi Zohar , Elaine Palmer Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Tue, Jun 4, 2019 at 1:01 PM Nayna wrote: > It seems efivars were first implemented in sysfs and then later > separated out as efivarfs. > Refer - Documentation/filesystems/efivarfs.txt. > > So, the reason wasn't that sysfs should not be used for exposing > firmware variables, > but for the size limitations which seems to come from UEFI Specification. > > Is this limitation valid for the new requirement of secure variables ? I don't think the size restriction is an issue now, but there's a lot of complex semantics around variable deletion and immutability that need to be represented somehow.