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=-15.5 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=unavailable 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 66399C48BCF for ; Wed, 9 Jun 2021 15:15:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4295C611CC for ; Wed, 9 Jun 2021 15:15:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229517AbhFIPRv (ORCPT ); Wed, 9 Jun 2021 11:17:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:45578 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230222AbhFIPRt (ORCPT ); Wed, 9 Jun 2021 11:17:49 -0400 Received: from jic23-huawei (cpc108967-cmbg20-2-0-cust86.5-4.cable.virginm.net [81.101.6.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 51D0E6128A; Wed, 9 Jun 2021 15:15:50 +0000 (UTC) Date: Wed, 9 Jun 2021 16:17:42 +0100 From: Jonathan Cameron To: William Breathitt Gray Cc: linux-stm32@st-md-mailman.stormreply.com, kernel@pengutronix.de, a.fatoum@pengutronix.de, kamel.bouhara@bootlin.com, gwendal@chromium.org, alexandre.belloni@bootlin.com, david@lechnology.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, syednwaris@gmail.com, patrick.havelange@essensium.com, fabrice.gasnier@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, o.rempel@pengutronix.de, jarkko.nikula@linux.intel.com Subject: Re: [PATCH v11 05/33] counter: 104-quad-8: Annotate hardware config module parameter Message-ID: <20210609161742.14df9b1d@jic23-huawei> In-Reply-To: <97ce79878a26809f0b15b2eac9a86ca39e0ecd74.1623201081.git.vilhelm.gray@gmail.com> References: <97ce79878a26809f0b15b2eac9a86ca39e0ecd74.1623201081.git.vilhelm.gray@gmail.com> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 9 Jun 2021 10:31:08 +0900 William Breathitt Gray wrote: > 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 the 104-QUAD-8 driver. > > Acked-by: Syed Nayyar Waris > Signed-off-by: William Breathitt Gray As this has no dependency on patch 4, I've applied it. Applied to the togreg branch of iio.git and pushed out as testing for the autobuilders to poke at it. Thanks, Jonathan > --- > drivers/counter/104-quad-8.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c > index 233a3acc1377..0fd61cc82d30 100644 > --- a/drivers/counter/104-quad-8.c > +++ b/drivers/counter/104-quad-8.c > @@ -21,7 +21,7 @@ > > static unsigned int base[max_num_isa_dev(QUAD8_EXTENT)]; > static unsigned int num_quad8; > -module_param_array(base, uint, &num_quad8, 0); > +module_param_hw_array(base, uint, ioport, &num_quad8, 0); > MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses"); > > #define QUAD8_NUM_COUNTERS 8