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=-10.9 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 7FCF6C47080 for ; Tue, 1 Jun 2021 13:29:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 571FE61263 for ; Tue, 1 Jun 2021 13:29:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233964AbhFANbN (ORCPT ); Tue, 1 Jun 2021 09:31:13 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:2932 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233768AbhFANbJ (ORCPT ); Tue, 1 Jun 2021 09:31:09 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4FvXxK1bj2z68fC; Tue, 1 Jun 2021 21:26:29 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 1 Jun 2021 21:29:26 +0800 Received: from [10.174.177.243] (10.174.177.243) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 1 Jun 2021 21:29:25 +0800 Subject: Re: [PATCH 0/2] ARM: fix PXN process with LPAE feature To: Russell King , CC: Catalin Marinas , , Andrew Morton , Jungseung Lee References: <20210529034138.83384-1-wangkefeng.wang@huawei.com> From: Kefeng Wang Message-ID: <09d3b1ac-01ab-ba8b-014a-8db8c58bfc45@huawei.com> Date: Tue, 1 Jun 2021 21:29:25 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20210529034138.83384-1-wangkefeng.wang@huawei.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/5/29 11:41, Kefeng Wang wrote: > refactor and cleanup [__do|do]_page_fault, then fix the pxn process > when lpae feature enabled. Additional information: when user code execution with privilege mode, it will lead infinite loop in the page fault handler if ARM_LPAE enabled,  the issue could be reproduced with  "echo EXEC_USERSPACE > /sys/kernel/debug/provoke-crash/DIRECT" also I could add a die_kernel_fault() (like arm64 does) to report different message in different scenes. Any comments, thanks. > > Kefeng Wang (2): > ARM: mm: Refactor __do_page_fault() > ARM: mm: Fix PXN process when ARM_LPAE enabled > > arch/arm/mm/fault.c | 78 +++++++++++++++++---------------------------- > 1 file changed, 30 insertions(+), 48 deletions(-) >