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=-6.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,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 72BAFC11F66 for ; Wed, 14 Jul 2021 02:12:47 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2E0FC613C5 for ; Wed, 14 Jul 2021 02:12:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E0FC613C5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6A4E56B0088; Tue, 13 Jul 2021 22:12:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 67C056B008C; Tue, 13 Jul 2021 22:12:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 51E0E6B0092; Tue, 13 Jul 2021 22:12:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0058.hostedemail.com [216.40.44.58]) by kanga.kvack.org (Postfix) with ESMTP id 2FB9D6B0088 for ; Tue, 13 Jul 2021 22:12:47 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 2F1CC1857A0B8 for ; Wed, 14 Jul 2021 02:12:46 +0000 (UTC) X-FDA: 78359569932.26.A2F7B1F Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf26.hostedemail.com (Postfix) with ESMTP id DAE7720019EF for ; Wed, 14 Jul 2021 02:12:45 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id C004461361; Wed, 14 Jul 2021 02:12:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1626228765; bh=Jwi7AbYEtGfiDNjGtofY5nG3THrr3SBHhR5X4dqayGA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=bzekOjb1S9qPuBSVgMzCSyGMgVRPTvim7xeFJKIHFbIHtbb7AcRpQCysIyXJCRCDO HbsII8uAekH0D+lwmcoO9u4jqjAeCgOal7NHC4oJzyGAerNrAJ/QPlgf1gYhuDI0qt End5dbDL2cga4RhOmFvwJ+vNW46tltiiF0qnZaLY= Date: Tue, 13 Jul 2021 19:12:44 -0700 From: Andrew Morton To: "Matthew Wilcox (Oracle)" Cc: Mina Almasry , YueHaibing , Axel Rasmussen , Peter Xu , Mike Kravetz , Linus Torvalds , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: Make copy_huge_page() always available Message-Id: <20210713191244.553680171f9fab3bf6e0889b@linux-foundation.org> In-Reply-To: <20210712153207.39302-1-willy@infradead.org> References: <20210712153207.39302-1-willy@infradead.org> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: DAE7720019EF X-Stat-Signature: 4s4yyrbzird3q46mo8c3y37k8jny4j4o Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=bzekOjb1; spf=pass (imf26.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-HE-Tag: 1626228765-184290 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, 12 Jul 2021 16:32:07 +0100 "Matthew Wilcox (Oracle)" wrote: > Rewrite copy_huge_page() and move it into mm/util.c so it's always > available. Fixes an exposure of uninitialised memory on configurations > with HUGETLB and UFFD enabled and MIGRATION disabled. Wait. Exposing uninitialized memory is serious. Can we please include full info on this flaw and decide whether a -stable backport is justified? If not, why not, etc?