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=-3.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_GIT 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 F1548C43381 for ; Tue, 26 Mar 2019 00:18:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AD6C0207DD for ; Tue, 26 Mar 2019 00:18:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="cqvRgXjd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729475AbfCZASo (ORCPT ); Mon, 25 Mar 2019 20:18:44 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:15872 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726186AbfCZASo (ORCPT ); Mon, 25 Mar 2019 20:18:44 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 25 Mar 2019 17:18:41 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Mon, 25 Mar 2019 17:18:43 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Mon, 25 Mar 2019 17:18:43 -0700 Received: from rcampbell-dev.nvidia.com (10.124.1.5) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 26 Mar 2019 00:18:43 +0000 From: To: CC: Ralph Campbell , Craig Bergstrom , Linus Torvalds , Boris Ostrovsky , Fengguang Wu , Greg Kroah-Hartman , Hans Verkuil , Mauro Carvalho Chehab , Peter Zijlstra , Sander Eikelenboom , Sean Young , Thomas Gleixner , Ingo Molnar Subject: [PATCH v2 0/1] x86/mm: Fix limit mmap() of /dev/mem to valid physical Date: Mon, 25 Mar 2019 17:18:16 -0700 Message-ID: <20190326001817.15413-1-rcampbell@nvidia.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-NVConfidentiality: public X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL101.nvidia.com (172.20.187.10) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1553559521; bh=Ar2rKTHyUtl4aYwVRAxRlJMl89iafQ2aXTYpxu+WCO0=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: MIME-Version:X-NVConfidentiality:X-Originating-IP: X-ClientProxiedBy:Content-Transfer-Encoding:Content-Type; b=cqvRgXjdzSmLk9NZ6OfUvmp4wfyVlWef1Yu+K6xe08gd/khlZs1opUw4eVZGGEiHD jrz0wdXsmNw0Hr2JZJgM47gqZPDvd8JW90kKtyxyBS3/speV+cHWThkXLHJ52JoxNr vzx/4TspKXwl3U73Jh1pSmy2V62CUG34vVHZBTAhFvxkjgFEHIYUvi9BDiL/XB6f1o mKWCfTKg8jOMQBwgAWQA3JVEnRl06UDuTHSjswHdY4Tns3TYCJmW7X4NrpVMGFfBeR 4fc8y5uXU87hs63ghTqjx/VzEKI0I2yspZ4hjfQzAatZ2TBAw4MajGMjcvxI22DXv/ ZGvsFQYj7f8tw== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ralph Campbell I was debugging with v5.1.0-rc1 and while booting I hit a kernel BUG at arch/x86/mm/physaddr.c:27 which I fixed with the following patch but now I can't seem to reproduce the exact setup that triggered it. Still, it seems like a valid problem and maybe my difficulty in reproducing it explains why others haven't seen it earlier. Changes from v1 to v2: * Updated the change log and patch as suggested by Thomas Gleixner. Ralph Campbell (1): x86/mm: Fix limit mmap() of /dev/mem to valid physical addresses arch/x86/mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --=20 2.20.1