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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 C6A37C432BE for ; Wed, 11 Aug 2021 20:36:39 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 72C2960FC3 for ; Wed, 11 Aug 2021 20:36:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 72C2960FC3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 2C6204056C; Wed, 11 Aug 2021 20:36:39 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VF9rTp29DFov; Wed, 11 Aug 2021 20:36:35 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id B274D4055D; Wed, 11 Aug 2021 20:36:34 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 84A1CC001A; Wed, 11 Aug 2021 20:36:34 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 18FB2C000E for ; Wed, 11 Aug 2021 20:36:33 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 0EA194056C for ; Wed, 11 Aug 2021 20:36:33 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wN9ldQi57y8S for ; Wed, 11 Aug 2021 20:36:31 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by smtp4.osuosl.org (Postfix) with ESMTPS id 12F684055D for ; Wed, 11 Aug 2021 20:36:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628714189; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=F6mT/4MmPGt0OpBTI+vB4Ipr2jKicz7mUc5W2HAhCYc=; b=fla127/hYJ6V3mdECjmacgGxXREyX4CfXRqhUyG0KpfGnE1lTRPzf9ox/vuzI1EmUc9Ddw WkN20Tr40EE0nMzyQJO8s0UdIfCsOLfmaYJXvLRC4ow1QbIzK5/Bia8rglnilZqXgBz2Ir Pp2wxrKE0/kxd9hm/qUYCKF7JHi83x0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-185-YTGvH1lAPJyBloRRyBVg5Q-1; Wed, 11 Aug 2021 16:36:26 -0400 X-MC-Unique: YTGvH1lAPJyBloRRyBVg5Q-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B38988799E0; Wed, 11 Aug 2021 20:36:24 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.112]) by smtp.corp.redhat.com (Postfix) with ESMTP id EB8541B46B; Wed, 11 Aug 2021 20:36:13 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Subject: [PATCH v1 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem Date: Wed, 11 Aug 2021 22:36:09 +0200 Message-Id: <20210811203612.138506-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Cc: Arnd Bergmann , "Michael S. Tsirkin" , Greg Kroah-Hartman , "Rafael J. Wysocki" , virtualization@lists.linux-foundation.org, linux-mm@kvack.org, Hanjun Guo , Andrew Morton , Andy Shevchenko , Dan Williams X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" Let's add the basic infrastructure to exclude some physical memory regions completely from /dev/mem access, on any architecture and under any system configuration (independent of CONFIG_STRICT_DEVMEM and independent of "iomem="). Use it for virtio-mem, to disallow mapping any virtio-mem memory via /dev/mem to user space after the virtio-mem driver was loaded: there is no sane use case to access the device-managed memory region via /dev/mem once the driver is actively (un)plugging memory within that region and we want to make sure that nobody will accidentially access unplugged memory in a sane environment. Details can be found in patch #1. Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: "Rafael J. Wysocki" Cc: Andrew Morton Cc: Dan Williams Cc: Hanjun Guo Cc: Andy Shevchenko Cc: virtualization@lists.linux-foundation.org Cc: linux-mm@kvack.org David Hildenbrand (3): /dev/mem: disallow access to explicitly excluded system RAM regions virtio-mem: disallow mapping virtio-mem memory via /dev/mem kernel/resource: cleanup and optimize iomem_is_exclusive() drivers/char/mem.c | 22 ++++++------- drivers/virtio/virtio_mem.c | 4 ++- include/linux/ioport.h | 1 + kernel/resource.c | 61 ++++++++++++++++++++++++++++++++----- lib/Kconfig.debug | 4 ++- 5 files changed, 69 insertions(+), 23 deletions(-) -- 2.31.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization