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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28ABDC4321E for ; Mon, 14 Feb 2022 17:01:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9A4E56B007B; Mon, 14 Feb 2022 12:01:19 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 953C36B007D; Mon, 14 Feb 2022 12:01:19 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 86A6E6B007E; Mon, 14 Feb 2022 12:01:19 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0068.hostedemail.com [216.40.44.68]) by kanga.kvack.org (Postfix) with ESMTP id 784EE6B007B for ; Mon, 14 Feb 2022 12:01:19 -0500 (EST) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 3979018128AEC for ; Mon, 14 Feb 2022 17:01:19 +0000 (UTC) X-FDA: 79142001078.26.FF554B9 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf31.hostedemail.com (Postfix) with ESMTP id D052E20014 for ; Mon, 14 Feb 2022 17:01:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=MrxZM+dtR1LjIHLm64CmzES4OEtfVkeNuYlvax0H88s=; b=1xI1/Fvb99aqHheC6mtY388ud6 9MT/bHCftGydYIWxm+hS4zGwhvbFt8OzX+edrM5UnO4tP1NBqSh70Lw78bL6Q3BsXOm/Di6JZoJYH wtHggpB7JYRvrXSaY0/s1eEkO2PXvhxpwgVhrfp/eQEItM485WwqPYb5B+6tJYfNWM5IfOyU+3GNz wgU3yHvVJYtieNqr2ZSULdjEvye7TyhUfxnlCnsscD5y8hniE9PulQxdXM5zxaKuNaLViAmRHCutR 73lx+6HTraO/VU29BXdY1lFIki5yroT8XZ/YKJV8c3pSdMpd1Wlg6zLRh5SejJ7jky/eNWrhj93gC ys6P1MSw==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJeis-00GF7n-M5; Mon, 14 Feb 2022 17:01:10 +0000 Date: Mon, 14 Feb 2022 09:01:10 -0800 From: Christoph Hellwig To: Arnd Bergmann Cc: Linus Torvalds , Christoph Hellwig , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, mark.rutland@arm.com, dalias@libc.org, linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, peterz@infradead.org, jcmvbkbc@gmail.com, guoren@kernel.org, sparclinux@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org, will@kernel.org, ardb@kernel.org, linux-s390@vger.kernel.org, bcain@codeaurora.org, deller@gmx.de, x86@kernel.org, linux@armlinux.org.uk, linux-csky@vger.kernel.org, mingo@redhat.com, geert@linux-m68k.org, linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, hca@linux.ibm.com, linux-alpha@vger.kernel.org, linux-um@lists.infradead.org, linux-m68k@lists.linux-m68k.org, openrisc@lists.librecores.org, green.hu@gmail.com, shorne@gmail.com, linux-arm-kernel@lists.infradead.org, monstr@monstr.eu, tsbogend@alpha.franken.de, linux-parisc@vger.kernel.org, nickhu@andestech.com, linux-mips@vger.kernel.org, stable@vger.kernel.org, dinguyen@kernel.org, ebiederm@xmission.com, richard@nod.at, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, davem@davemloft.net Subject: Re: [PATCH 03/14] nds32: fix access_ok() checks in get/put_user Message-ID: References: <20220214163452.1568807-1-arnd@kernel.org> <20220214163452.1568807-4-arnd@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220214163452.1568807-4-arnd@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: D052E20014 X-Stat-Signature: y68c5gbcxf9bdtb3yow784ditsmtag98 Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b="1xI1/Fvb"; spf=none (imf31.hostedemail.com: domain of BATV+86effef50fc3f8a1c567+6749+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+86effef50fc3f8a1c567+6749+infradead.org+hch@bombadil.srs.infradead.org; dmarc=none X-HE-Tag: 1644858078-578390 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Feb 14, 2022 at 05:34:41PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann > > The get_user()/put_user() functions are meant to check for > access_ok(), while the __get_user()/__put_user() functions > don't. > > This broke in 4.19 for nds32, when it gained an extraneous > check in __get_user(), but lost the check it needs in > __put_user(). Can we follow the lead of MIPS (which this was originally copied from I think) and kill the pointless __get/put_user_check wrapper that just obsfucate the code?