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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 B0A23C433C1 for ; Wed, 31 Mar 2021 06:08:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2D2C1619CF for ; Wed, 31 Mar 2021 06:08:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D2C1619CF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 844236B007E; Wed, 31 Mar 2021 02:08:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7F49B6B0081; Wed, 31 Mar 2021 02:08:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 695016B0082; Wed, 31 Mar 2021 02:08:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0155.hostedemail.com [216.40.44.155]) by kanga.kvack.org (Postfix) with ESMTP id 4C9F16B007E for ; Wed, 31 Mar 2021 02:08:15 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id E75998249980 for ; Wed, 31 Mar 2021 06:08:14 +0000 (UTC) X-FDA: 77979139308.08.8D0C98F Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf27.hostedemail.com (Postfix) with ESMTP id 9C11980192E2 for ; Wed, 31 Mar 2021 06:08:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=7IvC4hNDkOIVsb77e8MajyiRyQ2axEdp/5qIsuVXObY=; b=KyzoiUHJO4d+SyNZKEQhlBZXQX H8zbwZipxVM3w9wgrx6Nelr15WZ9t7NCvD3TyFzcMXqalX3dGo2Ony0+IdHCRo3lpPOxlFZY57VgE aEZmB6sgCXNDSx78i/t6a1847uCTZak+qkV6JFWyQhbvZ5N1Wvs2rbpw9lSCBMecnVHZRUHVkTY6N mJJ3B4wG/5Pjq+2E99hjDW6Fdtd+OScEwDToszr902HN0N50pVPdu66FBmltFOEk03RNzfJ2SU5Q0 KWcHN92D5WCGNKrUDx19TKkzzRs5CLHk7VZ//VK4lOTOy8nM/zpCub/vqpPVkj+o9+DTfqRtDzKl7 tXRzxXfA==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lRU0x-0046KK-M3; Wed, 31 Mar 2021 06:07:42 +0000 Date: Wed, 31 Mar 2021 07:07:39 +0100 From: Matthew Wilcox To: HORIGUCHI =?utf-8?B?TkFPWUEo5aCA5Y+j44CA55u05LmfKQ==?= Cc: David Hildenbrand , Aili Yao , "akpm@linux-foundation.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "yangfeng1@kingsoft.com" , "sunhao2@kingsoft.com" , Oscar Salvador , Mike Kravetz Subject: Re: [PATCH v5] mm/gup: check page hwposion status for coredump. Message-ID: <20210331060739.GW351017@casper.infradead.org> References: <20210317163714.328a038d@alex-virtual-machine> <20a0d078-f49d-54d6-9f04-f6b41dd51e5f@redhat.com> <20210318044600.GJ3420@casper.infradead.org> <20210318133412.12078eb7@alex-virtual-machine> <20210319104437.6f30e80d@alex-virtual-machine> <20210320003516.GC3420@casper.infradead.org> <20210322193318.377c9ce9@alex-virtual-machine> <20210331015258.GB22060@hori.linux.bs1.fc.nec.co.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210331015258.GB22060@hori.linux.bs1.fc.nec.co.jp> X-Rspamd-Queue-Id: 9C11980192E2 X-Stat-Signature: zi5qejdasmxn4roewm9n9ofx34o9nw5z X-Rspamd-Server: rspam02 Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf27; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617170893-876702 Content-Transfer-Encoding: quoted-printable 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 Wed, Mar 31, 2021 at 01:52:59AM +0000, HORIGUCHI NAOYA(=E5=A0=80=E5=8F= =A3 =E7=9B=B4=E4=B9=9F) wrote: > If we successfully unmapped but failed in truncate_error_page() for exa= mple, > the processes mapping the page would get -EFAULT as expected. But even= in > this case, other processes could reach the error page via page cache an= d > __get_user_pages_locked() for them could return the hwpoisoned page. How would that happen? We check PageHWPoison before inserting a page into the page tables. See, eg, filemap_map_pages() and __do_fault().