From patchwork Thu Dec 1 12:30:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 9456103 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6990160585 for ; Thu, 1 Dec 2016 12:41:26 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5A25220855 for ; Thu, 1 Dec 2016 12:41:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4D2D228480; Thu, 1 Dec 2016 12:41:26 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AA73D20855 for ; Thu, 1 Dec 2016 12:41:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758251AbcLAMaV (ORCPT ); Thu, 1 Dec 2016 07:30:21 -0500 Received: from mx1.redhat.com ([209.132.183.28]:40288 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758153AbcLAMaU (ORCPT ); Thu, 1 Dec 2016 07:30:20 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9E6058F23F; Thu, 1 Dec 2016 12:30:19 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-116-110.phx2.redhat.com [10.3.116.110]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uB1CUHTF014934; Thu, 1 Dec 2016 07:30:18 -0500 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 05/39] Annotate hardware config module parameters in drivers/char/ From: David Howells To: linux-kernel@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk, Arnd Bergmann , minyard@acm.org, Greg Kroah-Hartman , dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org Date: Thu, 01 Dec 2016 12:30:17 +0000 Message-ID: <148059541743.31612.12721693471755594615.stgit@warthog.procyon.org.uk> In-Reply-To: <148059537897.31612.9461043954611464597.stgit@warthog.procyon.org.uk> References: <148059537897.31612.9461043954611464597.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Thu, 01 Dec 2016 12:30:19 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP When the kernel is running in secure boot mode, we lock down the kernel to prevent userspace from modifying the running kernel image. Whilst this includes prohibiting access to things like /dev/mem, it must also prevent access by means of configuring driver modules in such a way as to cause a device to access or modify the kernel image. To this end, annotate module_param* statements that refer to hardware configuration and indicate for future reference what type of parameter they specify. The parameter parser in the core sees this information and can skip such parameters with an error message if the kernel is locked down. The module initialisation then runs as normal, but just sees whatever the default values for those parameters is. Note that we do still need to do the module initialisation because some drivers have viable defaults set in case parameters aren't specified and some drivers support automatic configuration (e.g. PNP or PCI) in addition to manually coded parameters. This patch annotates drivers in drivers/char/. Suggested-by: One Thousand Gnomes Signed-off-by: David Howells cc: Arnd Bergmann cc: Greg Kroah-Hartman --- drivers/char/applicom.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/char/applicom.c b/drivers/char/applicom.c index 14790304b84b..b1bf7a687a59 100644 --- a/drivers/char/applicom.c +++ b/drivers/char/applicom.c @@ -94,9 +94,9 @@ static struct applicom_board { static unsigned int irq = 0; /* interrupt number IRQ */ static unsigned long mem = 0; /* physical segment of board */ -module_param(irq, uint, 0); +module_param_hw(irq, uint, irq, 0); MODULE_PARM_DESC(irq, "IRQ of the Applicom board"); -module_param(mem, ulong, 0); +module_param_hw(mem, ulong, iomem, 0); MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board"); static unsigned int numboards; /* number of installed boards */