Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp767935pxb; Thu, 21 Jan 2021 21:14:03 -0800 (PST) X-Google-Smtp-Source: ABdhPJzpC7AoSc30/zXpxdqIeD5QqJv5nFCTYKehNPch790o8EYOgMGc4LtrhB4Gl8Yrw82y/rKZ X-Received: by 2002:a17:906:4159:: with SMTP id l25mr1721492ejk.311.1611292443514; Thu, 21 Jan 2021 21:14:03 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1611292443; cv=none; d=google.com; s=arc-20160816; b=0Re2hSusPY92a+K2e0LrdU6S3aqU1RgafAXAubo0VzhLJBjwI+3Ga2uzifhM7VL2PN YYhun8NHapNj7G/VvVQiAnb31I2dY5885F8BZDWzpFtqv63w8KCyn4zUts3WAAZioMDb wOETVWD5682CgBmnQtS5W96CiIwq+f6SzsxeOLysPjMXEVR2MUo2PoGC5BhSFL2Hn5F7 WFJ+Q1BqAksHDWndUdCiAOZWK4wS2rYGeN/A3lNFrwysQU8vJ/Q5hqpeKj9cTYqj/sNd v+QV5Dov6bZN301kMGuoRtr34btKXc/k7qhzxV/u8QZUdUP40hwHQdPjnG1I1paNqXB9 KqVA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:message-id:in-reply-to :subject:cc:to:from:date; bh=yrRxWdoqCHnTCXyqdxfzAszK1eq6VDJDQ5zxrpm08pQ=; b=HHmZFiaKPwKiI94QIC34WWbCKMq2tN40JxoUD7GU4IkZkRjSb48m764Xb/iiZVRqYH zp3MN7roAyI6KD/Ngk4fpIfvl4FSCy2geGDSmK5fVg/yFoQxLFNk+ZkRMGsvOMDbBUG2 Hx937isQbYPbYMFi7Z16EDyUQ1hWvcXxW0Xp3rI5skKLnibUcG/Cm6l8pCpE6oVuXVUd BCNDOkwsa1AlzvMjpjwk/R/M0fe1HcYyvr7qtrfJxzHtcFCqf41b8Qx1+2qPXYaKR5ec 3mF1S6oOP0H+WOutgbbZ5zxq3J/K9eT78Z10gbIVkCtauJWu3H4Qa+TzBqXPgGjH5fhI a5qg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id o27si2633071ejc.279.2021.01.21.21.13.40; Thu, 21 Jan 2021 21:14:03 -0800 (PST) Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726157AbhAVEkG (ORCPT + 99 others); Thu, 21 Jan 2021 23:40:06 -0500 Received: from namei.org ([65.99.196.166]:53274 "EHLO mail.namei.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725912AbhAVEkF (ORCPT ); Thu, 21 Jan 2021 23:40:05 -0500 Received: from localhost (localhost [127.0.0.1]) by mail.namei.org (Postfix) with ESMTPS id 7FE1C1BC; Fri, 22 Jan 2021 04:38:32 +0000 (UTC) Date: Fri, 22 Jan 2021 15:38:32 +1100 (AEDT) From: James Morris To: Christian Brauner cc: Alexander Viro , Christoph Hellwig , linux-fsdevel@vger.kernel.org, John Johansen , Mimi Zohar , Dmitry Kasatkin , Stephen Smalley , Casey Schaufler , Arnd Bergmann , Andreas Dilger , OGAWA Hirofumi , Geoffrey Thomas , Mrunal Patel , Josh Triplett , Andy Lutomirski , Theodore Tso , Alban Crequy , Tycho Andersen , David Howells , James Bottomley , Seth Forshee , =?ISO-8859-15?Q?St=E9phane_Graber?= , Linus Torvalds , Aleksa Sarai , Lennart Poettering , "Eric W. Biederman" , smbarber@chromium.org, Phil Estes , Serge Hallyn , Kees Cook , Todd Kjos , Paul Moore , Jonathan Corbet , containers@lists.linux-foundation.org, linux-security-module@vger.kernel.org, linux-api@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-integrity@vger.kernel.org, selinux@vger.kernel.org Subject: Re: [PATCH v6 28/40] overlayfs: do not mount on top of idmapped mounts In-Reply-To: <20210121131959.646623-29-christian.brauner@ubuntu.com> Message-ID: <54ba9dc6-844f-1df4-ab6b-9cd37d9ab465@namei.org> References: <20210121131959.646623-1-christian.brauner@ubuntu.com> <20210121131959.646623-29-christian.brauner@ubuntu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Thu, 21 Jan 2021, Christian Brauner wrote: > Prevent overlayfs from being mounted on top of idmapped mounts. > Stacking filesystems need to be prevented from being mounted on top of > idmapped mounts until they have have been converted to handle this. > > Link: https://lore.kernel.org/r/20210112220124.837960-40-christian.brauner@ubuntu.com > Cc: Christoph Hellwig > Cc: David Howells > Cc: Al Viro > Cc: linux-fsdevel@vger.kernel.org > Signed-off-by: Christian Brauner Reviewed-by: James Morris -- James Morris