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Thu, 29 Oct 2020 17:06:22 -0400 (EDT) Date: Thu, 29 Oct 2020 15:06:20 -0600 From: Tycho Andersen To: Christian Brauner Subject: Re: [PATCH 00/34] fs: idmapped mounts Message-ID: <20201029210620.GB135035@cisco> References: <20201029003252.2128653-1-christian.brauner@ubuntu.com> <20201029022733.GB306023@dread.disaster.area> <20201029161920.zp7p3335x3q2a36e@wittgenstein> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201029161920.zp7p3335x3q2a36e@wittgenstein> Cc: Andy Lutomirski , Dave Chinner , Mimi Zohar , David Howells , Andreas Dilger , Miklos Szeredi , smbarber@chromium.org, Christoph Hellwig , Casey Schaufler , linux-ext4@vger.kernel.org, Mrunal Patel , Kees Cook , Arnd Bergmann , Jann Horn , selinux@vger.kernel.org, Josh Triplett , Seth Forshee , Alexander Viro , Lennart Poettering , OGAWA Hirofumi , Geoffrey Thomas , James Bottomley , John Johansen , Theodore Tso , Dmitry Kasatkin , containers@lists.linux-foundation.org, Jonathan Corbet , linux-unionfs@vger.kernel.org, linux-security-module@vger.kernel.org, linux-audit@redhat.com, "Eric W. Biederman" , linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, Alban Crequy , linux-integrity@vger.kernel.org, Stephen Smalley , Todd Kjos X-BeenThere: containers@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux Containers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: containers-bounces@lists.linux-foundation.org Sender: "Containers" On Thu, Oct 29, 2020 at 05:19:20PM +0100, Christian Brauner wrote: > This approach (always) seemed conceptually wrong to me. Like Tycho said > somewhere else this basically would act like a global variable which > isn't great. Elaborating on this a bit: the way Christian has organized this series (by adding a parameter to the various inode operations) forces people to make a choice about what user namespace to pass. They can of course make the wrong choice, but that will show up in a diff somewhere, and hopefully someone will notice. If we pass things via current-> somewhere, people could potentially avoid making this choice, and then we wind more of the kinds of bugs Eric is worried about elsewhere in the thread. While it does result in larger patches initally, requiring people to reason about it explicitly is the right move, IMO. Tycho _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/containers