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=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 0C58DC43387 for ; Fri, 11 Jan 2019 18:45:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7FB420878 for ; Fri, 11 Jan 2019 18:45:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390169AbfAKSpH (ORCPT ); Fri, 11 Jan 2019 13:45:07 -0500 Received: from relay.sw.ru ([185.231.240.75]:41722 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730785AbfAKSpF (ORCPT ); Fri, 11 Jan 2019 13:45:05 -0500 Received: from [172.16.25.12] by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1gi1ni-0006ek-Ka; Fri, 11 Jan 2019 21:45:02 +0300 Subject: Re: [PATCH] page_poison: plays nicely with KASAN To: Qian Cai , akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20190107223636.80593-1-cai@lca.pw> From: Andrey Ryabinin Message-ID: <2e46c139-70d3-dc86-28c9-a9f263651b57@virtuozzo.com> Date: Fri, 11 Jan 2019 21:45:25 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190107223636.80593-1-cai@lca.pw> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/8/19 1:36 AM, Qian Cai wrote: > > diff --git a/mm/page_poison.c b/mm/page_poison.c > index f0c15e9017c0..e546b70e592a 100644 > --- a/mm/page_poison.c > +++ b/mm/page_poison.c > @@ -6,6 +6,7 @@ > #include > #include > #include > +#include > > static bool want_page_poisoning __read_mostly; > > @@ -40,6 +41,7 @@ static void poison_page(struct page *page) > { > void *addr = kmap_atomic(page); > > + kasan_unpoison_shadow(addr, PAGE_SIZE); > memset(addr, PAGE_POISON, PAGE_SIZE); kasan_disable/enable_current() should be slightly more efficient for this case. > kunmap_atomic(addr); > } >