From patchwork Thu Dec 1 12:30:40 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 9456099 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 B79E860585 for ; Thu, 1 Dec 2016 12:40:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A9BF420855 for ; Thu, 1 Dec 2016 12:40:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9E7EE28480; Thu, 1 Dec 2016 12:40:42 +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=unavailable 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 C59D720855 for ; Thu, 1 Dec 2016 12:40:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758471AbcLAMau (ORCPT ); Thu, 1 Dec 2016 07:30:50 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33190 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758451AbcLAMas (ORCPT ); Thu, 1 Dec 2016 07:30:48 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (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 AA3CBC04D318; Thu, 1 Dec 2016 12:30:42 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-116-110.phx2.redhat.com [10.3.116.110]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uB1CUe7b030039; Thu, 1 Dec 2016 07:30:40 -0500 Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 08/39] Annotate hardware config module parameters in drivers/gpio/ From: David Howells To: linux-kernel@vger.kernel.org Cc: Alexandre Courbot , minyard@acm.org, gnomes@lxorguk.ukuu.org.uk, Linus Walleij , William Breathitt Gray , dhowells@redhat.com, linux-gpio@vger.kernel.org, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org Date: Thu, 01 Dec 2016 12:30:40 +0000 Message-ID: <148059543997.31612.610019846448617763.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 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 01 Dec 2016 12:30:42 +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/gpio/. Suggested-by: One Thousand Gnomes Signed-off-by: David Howells cc: William Breathitt Gray cc: Linus Walleij cc: Alexandre Courbot cc: linux-gpio@vger.kernel.org Acked-by: William Breathitt Gray Acked-by: Linus Walleij --- drivers/gpio/gpio-104-dio-48e.c | 4 ++-- drivers/gpio/gpio-104-idi-48.c | 4 ++-- drivers/gpio/gpio-104-idio-16.c | 4 ++-- drivers/gpio/gpio-gpio-mm.c | 2 +- drivers/gpio/gpio-ws16c48.c | 4 ++-- 5 files changed, 9 insertions(+), 9 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/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c index fcf776971ca9..1c334eed5821 100644 --- a/drivers/gpio/gpio-104-dio-48e.c +++ b/drivers/gpio/gpio-104-dio-48e.c @@ -33,11 +33,11 @@ static unsigned int base[MAX_NUM_DIO48E]; static unsigned int num_dio48e; -module_param_array(base, uint, &num_dio48e, 0); +module_param_hw_array(base, uint, ioport, &num_dio48e, 0); MODULE_PARM_DESC(base, "ACCES 104-DIO-48E base addresses"); static unsigned int irq[MAX_NUM_DIO48E]; -module_param_array(irq, uint, NULL, 0); +module_param_hw_array(irq, uint, irq, NULL, 0); MODULE_PARM_DESC(irq, "ACCES 104-DIO-48E interrupt line numbers"); /** diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c index 2d2763ea1a68..6639920b3299 100644 --- a/drivers/gpio/gpio-104-idi-48.c +++ b/drivers/gpio/gpio-104-idi-48.c @@ -33,11 +33,11 @@ static unsigned int base[MAX_NUM_IDI_48]; static unsigned int num_idi_48; -module_param_array(base, uint, &num_idi_48, 0); +module_param_hw_array(base, uint, ioport, &num_idi_48, 0); MODULE_PARM_DESC(base, "ACCES 104-IDI-48 base addresses"); static unsigned int irq[MAX_NUM_IDI_48]; -module_param_array(irq, uint, NULL, 0); +module_param_hw_array(irq, uint, irq, NULL, 0); MODULE_PARM_DESC(irq, "ACCES 104-IDI-48 interrupt line numbers"); /** diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c index 6787b8fcf0d8..6d7024ac2689 100644 --- a/drivers/gpio/gpio-104-idio-16.c +++ b/drivers/gpio/gpio-104-idio-16.c @@ -33,11 +33,11 @@ static unsigned int base[MAX_NUM_IDIO_16]; static unsigned int num_idio_16; -module_param_array(base, uint, &num_idio_16, 0); +module_param_hw_array(base, uint, ioport, &num_idio_16, 0); MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses"); static unsigned int irq[MAX_NUM_IDIO_16]; -module_param_array(irq, uint, NULL, 0); +module_param_hw_array(irq, uint, irq, NULL, 0); MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers"); /** diff --git a/drivers/gpio/gpio-gpio-mm.c b/drivers/gpio/gpio-gpio-mm.c index 1e7def9449ce..4ac2179b96ad 100644 --- a/drivers/gpio/gpio-gpio-mm.c +++ b/drivers/gpio/gpio-gpio-mm.c @@ -31,7 +31,7 @@ static unsigned int base[MAX_NUM_GPIOMM]; static unsigned int num_gpiomm; -module_param_array(base, uint, &num_gpiomm, 0); +module_param_hw_array(base, uint, ioport, &num_gpiomm, 0); MODULE_PARM_DESC(base, "Diamond Systems GPIO-MM base addresses"); /** diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c index eaa71d440ccf..c84d600a8bb0 100644 --- a/drivers/gpio/gpio-ws16c48.c +++ b/drivers/gpio/gpio-ws16c48.c @@ -30,11 +30,11 @@ static unsigned int base[MAX_NUM_WS16C48]; static unsigned int num_ws16c48; -module_param_array(base, uint, &num_ws16c48, 0); +module_param_hw_array(base, uint, ioport, &num_ws16c48, 0); MODULE_PARM_DESC(base, "WinSystems WS16C48 base addresses"); static unsigned int irq[MAX_NUM_WS16C48]; -module_param_array(irq, uint, NULL, 0); +module_param_hw_array(irq, uint, irq, NULL, 0); MODULE_PARM_DESC(irq, "WinSystems WS16C48 interrupt line numbers"); /**