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=-4.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 CEB42C433E1 for ; Fri, 24 Jul 2020 22:43:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A652A206EB for ; Fri, 24 Jul 2020 22:43:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726702AbgGXWnr (ORCPT ); Fri, 24 Jul 2020 18:43:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40038 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726154AbgGXWnq (ORCPT ); Fri, 24 Jul 2020 18:43:46 -0400 Received: from shards.monkeyblade.net (shards.monkeyblade.net [IPv6:2620:137:e000::1:9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 27EDEC0619D3; Fri, 24 Jul 2020 15:43:46 -0700 (PDT) Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 7C0081274F734; Fri, 24 Jul 2020 15:26:58 -0700 (PDT) Date: Fri, 24 Jul 2020 15:43:42 -0700 (PDT) Message-Id: <20200724.154342.1433271593505001306.davem@davemloft.net> To: hch@lst.de Cc: kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, edumazet@google.com, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org, mptcp@lists.01.org, lvs-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org Subject: Re: get rid of the address_space override in setsockopt v2 From: David Miller In-Reply-To: <20200723060908.50081-1-hch@lst.de> References: <20200723060908.50081-1-hch@lst.de> X-Mailer: Mew version 6.8 on Emacs 26.3 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 24 Jul 2020 15:26:59 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christoph Hellwig Date: Thu, 23 Jul 2020 08:08:42 +0200 > setsockopt is the last place in architecture-independ code that still > uses set_fs to force the uaccess routines to operate on kernel pointers. > > This series adds a new sockptr_t type that can contained either a kernel > or user pointer, and which has accessors that do the right thing, and > then uses it for setsockopt, starting by refactoring some low-level > helpers and moving them over to it before finally doing the main > setsockopt method. > > Note that apparently the eBPF selftests do not even cover this path, so > the series has been tested with a testing patch that always copies the > data first and passes a kernel pointer. This is something that works for > most common sockopts (and is something that the ePBF support relies on), > but unfortunately in various corner cases we either don't use the passed > in length, or in one case actually copy data back from setsockopt, or in > case of bpfilter straight out do not work with kernel pointers at all. > > Against net-next/master. > > Changes since v1: > - check that users don't pass in kernel addresses > - more bpfilter cleanups > - cosmetic mptcp tweak Series applied to net-next, I'm build testing and will push this out when that is done. Thanks.