Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933321AbdDERA3 (ORCPT ); Wed, 5 Apr 2017 13:00:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37414 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753393AbdDEQ62 (ORCPT ); Wed, 5 Apr 2017 12:58:28 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 04A312E6046 Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=dhowells@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 04A312E6046 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 11/38] Annotate hardware config module parameters in drivers/input/ From: David Howells To: linux-kernel@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk, gregkh@linuxfoundation.org, Dmitry Torokhov , dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, linux-input@vger.kernel.org Date: Wed, 05 Apr 2017 17:58:23 +0100 Message-ID: <149141150295.29162.10580790231116897238.stgit@warthog.procyon.org.uk> In-Reply-To: <149141141298.29162.5612793122429261720.stgit@warthog.procyon.org.uk> References: <149141141298.29162.5612793122429261720.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 05 Apr 2017 16:58:28 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3197 Lines: 75 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/input/. Suggested-by: Alan Cox Signed-off-by: David Howells Acked-by: Dmitry Torokhov cc: linux-input@vger.kernel.org --- drivers/input/mouse/inport.c | 2 +- drivers/input/mouse/logibm.c | 2 +- drivers/input/touchscreen/mk712.c | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/input/mouse/inport.c b/drivers/input/mouse/inport.c index 3827a22362de..9ce71dfa0de1 100644 --- a/drivers/input/mouse/inport.c +++ b/drivers/input/mouse/inport.c @@ -78,7 +78,7 @@ MODULE_LICENSE("GPL"); #define INPORT_IRQ 5 static int inport_irq = INPORT_IRQ; -module_param_named(irq, inport_irq, uint, 0); +module_param_hw_named(irq, inport_irq, uint, irq, 0); MODULE_PARM_DESC(irq, "IRQ number (5=default)"); static struct input_dev *inport_dev; diff --git a/drivers/input/mouse/logibm.c b/drivers/input/mouse/logibm.c index e2413113df22..6f165e053f4d 100644 --- a/drivers/input/mouse/logibm.c +++ b/drivers/input/mouse/logibm.c @@ -69,7 +69,7 @@ MODULE_LICENSE("GPL"); #define LOGIBM_IRQ 5 static int logibm_irq = LOGIBM_IRQ; -module_param_named(irq, logibm_irq, uint, 0); +module_param_hw_named(irq, logibm_irq, uint, irq, 0); MODULE_PARM_DESC(irq, "IRQ number (5=default)"); static struct input_dev *logibm_dev; diff --git a/drivers/input/touchscreen/mk712.c b/drivers/input/touchscreen/mk712.c index 36e57deacd03..bd5352824f77 100644 --- a/drivers/input/touchscreen/mk712.c +++ b/drivers/input/touchscreen/mk712.c @@ -50,11 +50,11 @@ MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver"); MODULE_LICENSE("GPL"); static unsigned int mk712_io = 0x260; /* Also 0x200, 0x208, 0x300 */ -module_param_named(io, mk712_io, uint, 0); +module_param_hw_named(io, mk712_io, uint, ioport, 0); MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller"); static unsigned int mk712_irq = 10; /* Also 12, 14, 15 */ -module_param_named(irq, mk712_irq, uint, 0); +module_param_hw_named(irq, mk712_irq, uint, irq, 0); MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller"); /* eight 8-bit registers */