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=-3.8 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 E538CC388F7 for ; Thu, 22 Oct 2020 20:09:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6025924640 for ; Thu, 22 Oct 2020 20:09:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6025924640 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9A2D46B005D; Thu, 22 Oct 2020 16:09:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8C3BA6B006C; Thu, 22 Oct 2020 16:09:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 73D3C6B005D; Thu, 22 Oct 2020 16:09:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0033.hostedemail.com [216.40.44.33]) by kanga.kvack.org (Postfix) with ESMTP id 34EC86B006C for ; Thu, 22 Oct 2020 16:09:25 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id C87223626 for ; Thu, 22 Oct 2020 20:09:24 +0000 (UTC) X-FDA: 77400651048.24.rings20_581419927253 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 9F6721A4A0; Thu, 22 Oct 2020 20:09:24 +0000 (UTC) X-HE-Tag: rings20_581419927253 X-Filterd-Recvd-Size: 3430 Received: from ZenIV.linux.org.uk (zeniv.linux.org.uk [195.92.253.2]) by imf28.hostedemail.com (Postfix) with ESMTP; Thu, 22 Oct 2020 20:09:23 +0000 (UTC) Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kVgte-006StU-Kc; Thu, 22 Oct 2020 20:09:14 +0000 Date: Thu, 22 Oct 2020 21:09:14 +0100 From: Al Viro To: Nick Desaulniers Cc: Arnd Bergmann , David Laight , Christoph Hellwig , David Hildenbrand , Greg KH , "kernel-team@android.com" , Andrew Morton , Jens Axboe , David Howells , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mips@vger.kernel.org" , "linux-parisc@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-s390@vger.kernel.org" , "sparclinux@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-aio@kvack.org" , "io-uring@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "keyrings@vger.kernel.org" , "linux-security-module@vger.kernel.org" Subject: Re: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Message-ID: <20201022200914.GY3576660@ZenIV.linux.org.uk> References: <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022132342.GB8781@lst.de> <8f1fff0c358b4b669d51cc80098dbba1@AcuMS.aculab.com> <20201022192458.GV3576660@ZenIV.linux.org.uk> <20201022200629.GX3576660@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201022200629.GX3576660@ZenIV.linux.org.uk> 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 Thu, Oct 22, 2020 at 09:06:29PM +0100, Al Viro wrote: > On Thu, Oct 22, 2020 at 08:24:58PM +0100, Al Viro wrote: > > > Depending upon the calling conventions, compiler might do truncation in caller or > > in a callee, but it must be done _somewhere_. > > Unless I'm misreading AAPCS64, > "Unlike in the 32-bit AAPCS, named integral values must be narrowed by the callee > rather than the caller" > in 6.4.2 means that callee must not _not_ expect the upper 32 bits of %x0..%x7 to contain Sorry, artefact of editing - that's "in 6.4.2 means that callee must _not_ expect the upper 32 bits of %x0..%x7 to contain" obviously.