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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 DFE18C433DF for ; Tue, 11 Aug 2020 21:19:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB04720781 for ; Tue, 11 Aug 2020 21:19:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597180743; bh=iAsvlzzjmL2yMDlzgwPkgVoLOZ76Z/bhkwh8ZzmYQE4=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=t35QExs4ub2BtpskfE2uIPaRr/uErLSdYEv8YGU3MK4aVc0I3XCUjoeWq8mOw3hkh zQ/6cy0XZvjuCEDg0gfMQTCbIWe/uPCL0HsN4BAyYqvlexeRRi2TPIUXAjWfyLwlTJ ZDF6ug2zXbJ7Tkq9N4P6JAHPaZ3qlGFUzA1B9wRk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726592AbgHKVTC (ORCPT ); Tue, 11 Aug 2020 17:19:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725987AbgHKVTC (ORCPT ); Tue, 11 Aug 2020 17:19:02 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A5395C06174A for ; Tue, 11 Aug 2020 14:19:01 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id w14so15152008ljj.4 for ; Tue, 11 Aug 2020 14:19:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=rA8YRs7dGB/GfkhZuYULS9uPbpqUgOSLUWngUo8yoaM=; b=B37Vu6gJyZiMc+9rfRlkcU20N9U10pvTExHnPuibbYthtQqVMegykJE7HYcY2zldNY 5gxGBXFItNBRH8z/eG/knEXfMsho/PZusS91v/AIuz6EknTOjHM1WbX1WJwE9Kjez0Pq BW2ud3bdkqnIsddUMftapP9Lsi2ETAl3njB+s= 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=rA8YRs7dGB/GfkhZuYULS9uPbpqUgOSLUWngUo8yoaM=; b=swEINOYayaMjCt30JZeDZaxCl9eV3+A/c/aXcVPFBtRJo8ZrHm5XNGSfHEL9KMvKK5 p77FPsfRvhOANFbNmW2TnbN2o7Sxm7oArxQl/XEb8USX1mVvgh35f+eZhsxL1le+XGFb F5nkkeYh1/lxpTb3/S17WdUxns4tAjqYufdLyMYLeFp0odNKNDXbPOfZ1ahepuISNMcI R4JRWONbDfQPAB9aKrwKoR42dr7iRPDrrp1FJIzI6E+n1QK8tBhyi+aETr7dkp64ShdA YWSkjjd7x72604aEPBSjhfs2NADzURmybZfX/d3XEsFpKAIlFvt5ncrMEQnQKVRh86nO EO5w== X-Gm-Message-State: AOAM533spfLw9yuWJORPNnUvUyhiI4WWNe7PpIlBJnDWxj7ZGHCJPTwA pFTMhZXH41lNnnuGXPHKRoLFD20sjZ4= X-Google-Smtp-Source: ABdhPJw0mIUFb/uofpCjEVsbXjdhtK0J7pH0aZMVEA2afzIUUA+6DQV4JjJb8NF2CovK9vdbRQPI6Q== X-Received: by 2002:a05:651c:1134:: with SMTP id e20mr4163820ljo.40.1597180739651; Tue, 11 Aug 2020 14:18:59 -0700 (PDT) Received: from mail-lj1-f174.google.com (mail-lj1-f174.google.com. [209.85.208.174]) by smtp.gmail.com with ESMTPSA id p9sm10278085ljg.76.2020.08.11.14.18.58 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Aug 2020 14:18:58 -0700 (PDT) Received: by mail-lj1-f174.google.com with SMTP id t6so15141126ljk.9 for ; Tue, 11 Aug 2020 14:18:58 -0700 (PDT) X-Received: by 2002:a2e:545:: with SMTP id 66mr3970905ljf.285.1597180737731; Tue, 11 Aug 2020 14:18:57 -0700 (PDT) MIME-Version: 1.0 References: <5C8E0FA8-274E-4B56-9B5A-88E768D01F3A@amacapital.net> In-Reply-To: From: Linus Torvalds Date: Tue, 11 Aug 2020 14:18:41 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: file metadata via fs API (was: [GIT PULL] Filesystem Information) To: Miklos Szeredi Cc: Jann Horn , Casey Schaufler , Andy Lutomirski , linux-fsdevel , David Howells , Al Viro , Karel Zak , Jeff Layton , Miklos Szeredi , Nicolas Dichtel , Christian Brauner , Lennart Poettering , Linux API , Ian Kent , LSM , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 11, 2020 at 1:56 PM Miklos Szeredi wrote: > > So that's where O_ALT comes in. If the application is consenting, > then that should prevent exploits. Or? If the application is consenting AND GETS IT RIGHT it should prevent exploits. But that's a big deal. Why not just do it the way I suggested? Then you don't have any of these issues. Linus