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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 50246C11F64 for ; Thu, 1 Jul 2021 14:41:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38A286140C for ; Thu, 1 Jul 2021 14:41:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232749AbhGAOoO (ORCPT ); Thu, 1 Jul 2021 10:44:14 -0400 Received: from mga14.intel.com ([192.55.52.115]:16341 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232405AbhGAOoN (ORCPT ); Thu, 1 Jul 2021 10:44:13 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10032"; a="208363977" X-IronPort-AV: E=Sophos;i="5.83,314,1616482800"; d="scan'208";a="208363977" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2021 07:41:42 -0700 X-IronPort-AV: E=Sophos;i="5.83,314,1616482800"; d="scan'208";a="626391409" Received: from acismesi-mobl1.amr.corp.intel.com (HELO [10.252.131.1]) ([10.252.131.1]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2021 07:41:42 -0700 Subject: Re: [PATCH v3 1/2] x86/ioremap: fix the pfn calculation mistake in __ioremap_check_ram() To: Yaohui Wang , dave.hansen@linux.intel.com, tglx@linutronix.de Cc: luto@kernel.org, peterz@infradead.org, mingo@redhat.com, bp@alien8.de, x86@kernel.org, linux-kernel@vger.kernel.org, luoben@linux.alibaba.com, Tom Lendacky , Brijesh Singh References: <20210621123419.2976-1-yaohuiwang@linux.alibaba.com> <20210621123419.2976-2-yaohuiwang@linux.alibaba.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210621123419.2976-2-yaohuiwang@linux.alibaba.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/21/21 5:34 AM, Yaohui Wang wrote: > For example, suppose memory range [phys_addr ~ phys_addr + PAGE_SIZE - 1] > is a normal RAM page. ioremap(phys_addr, PAGE_SIZE - 1) will succeed > (but it should not) because the pfn wrapping prevents this page to be > checked whether it touches non-ioremappable resources. I would have expected such a scenario to get caught by this check: if ((res->flags & IORESOURCE_SYSTEM_RAM) != IORESOURCE_SYSTEM_RAM) return false; Was this issue found by inspection, or is it causing an actual problem in practice? Also, it would be really nice to include the original authors when you send Fixes: for patches. BTW, scripts/get_maintainer.pl would have done this for you. I've added Tom and Brijesh. Please cc them in the future.