Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp997436imu; Fri, 11 Jan 2019 13:00:03 -0800 (PST) X-Google-Smtp-Source: ALg8bN6UcrEZ6hyFbjrelGZYPRN77KSU/7TFpvIL6JBzbqCe6IWkHJZfWBBWqd4XxWVIWLP8Ki3a X-Received: by 2002:a63:5d55:: with SMTP id o21mr14485439pgm.92.1547240403075; Fri, 11 Jan 2019 13:00:03 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1547240403; cv=none; d=google.com; s=arc-20160816; b=knKAH7DN1EMqRUJ92Z/Xyt32ZfbGJ+i4SXi2JPDzyRv6BQSRJeGYzOBWI0GLCWP1ZN 6xsk122Sm7pyl+qlzU96DkeQG25RsHZde2Zxu+X3tcJwwMZsSu3iQuNYv/mKXnCQAyb7 lUfCQwSwjAV3Numx2e374hXU9wUPqeClHbdz78F+ARsE/OORHE6Sx72EQPRNRW0DeYyE th1dit6w+uYuabw+/Kq0a0GkCIlZWgNuRGYN5G4v9/zysQaXqbfwrW48iZjqk1gl4iY/ RlISpJtpT9Cu56O2mCZWky6P19YMoIPQmgSN63khfcIXUhIZ7ogMgIalxQTdda7f7qQK 457w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject; bh=ionj83ZzKnoDBFaNVKjmNaOEAeG1WZQ54vXAmW+xC8I=; b=xr3/REtlZFZwjKCt9+cJ0NPj2Ko3+vd4LXsShVMjVpb/dr1CltQE1ZO6ppuVZMSaWA V4WyHxKuWvIjeqgxgoVd26ecEQT3fgX9mmsgksYDEMeOylEsbi/ZUvyMvOT5fP4d3fBR 2DRO0/YKtT8d+5bTHEn7tr0XEeSnt4IXxrl1HIi3djlvAcEm0iiirreWEngUrAZH1HSw MckO2OHKW5qE7WhcblX311qL2VZ7rto9GC5BYqUps1z5NvoOWKCE0T8gCQGgoyWW0m0v qtxKJd9gwAqn8SuLl4/5zuGsukez6X+diCKYc/bw3rhLRhgQ9MPJuAVl1OSjH1z+7kHy 3ofA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=virtuozzo.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b11si26382331pgt.289.2019.01.11.12.59.48; Fri, 11 Jan 2019 13:00:03 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=virtuozzo.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390162AbfAKSpG (ORCPT + 99 others); Fri, 11 Jan 2019 13:45:06 -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); > } >