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=-0.7 required=3.0 tests=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 B06CFC3A59E for ; Wed, 4 Sep 2019 22:35:13 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 30C5D21726 for ; Wed, 4 Sep 2019 22:35:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 30C5D21726 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46NzCy1L2lzDqxQ for ; Thu, 5 Sep 2019 08:35:10 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=redhat.com (client-ip=209.132.183.28; helo=mx1.redhat.com; envelope-from=dhowells@redhat.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 46Nz7r3wSQzDqX9 for ; Thu, 5 Sep 2019 08:31:32 +1000 (AEST) Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7774A10277E2; Wed, 4 Sep 2019 22:31:27 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-120-255.rdu2.redhat.com [10.10.120.255]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2332A1001956; Wed, 4 Sep 2019 22:31:16 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <20190904201933.10736-1-cyphar@cyphar.com> <20190904201933.10736-11-cyphar@cyphar.com> <20190904214856.vnvom7h5xontvngq@yavin.dot.cyphar.com> To: Linus Torvalds Subject: Re: [PATCH v12 10/12] namei: aggressively check for nd->root escape on ".." resolution MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <20591.1567636276.1@warthog.procyon.org.uk> Date: Wed, 04 Sep 2019 23:31:16 +0100 Message-ID: <20592.1567636276@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.66]); Wed, 04 Sep 2019 22:31:28 +0000 (UTC) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-ia64@vger.kernel.org, Linux-sh list , Peter Zijlstra , Rasmus Villemoes , Alexei Starovoitov , Linux List Kernel Mailing , David Howells , "open list:KERNEL SELFTEST FRAMEWORK" , sparclinux@vger.kernel.org, Shuah Khan , linux-arch , linux-s390 , Tycho Andersen , Aleksa Sarai , Jiri Olsa , Alexander Shishkin , Ingo Molnar , Linux ARM , linux-mips@vger.kernel.org, linux-xtensa@linux-xtensa.org, Kees Cook , Arnd Bergmann , Jann Horn , Aleksa Sarai , Al Viro , Andy Lutomirski , Shuah Khan , Namhyung Kim , David Drysdale , Christian Brauner , "J. Bruce Fields" , linux-parisc@vger.kernel.org, linux-m68k , Linux API , Chanho Min , Jeff Layton , Oleg Nesterov , Eric Biederman , alpha , linux-fsdevel , Andrew Morton , linuxppc-dev@lists.ozlabs.org, Linux Containers Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Linus Torvalds wrote: > > Hinting to userspace to do a retry (with -EAGAIN as you mention in your > > other mail) wouldn't be a bad thing at all, though you'd almost > > certainly get quite a few spurious -EAGAINs -- &{mount,rename}_lock are > > global for the entire machine, after all. > > I'd hope that we have some future (possibly very long-term) > alternative that is not quite system-global, but yes, right now they > are. It ought to be reasonably easy to make them per-sb at least, I think. We don't allow cross-super rename, right? David