From: William Breathitt Gray <vilhelm.gray@gmail.com> To: jic23@kernel.org Cc: kernel@pengutronix.de, linux-stm32@st-md-mailman.stormreply.com, 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, William Breathitt Gray <vilhelm.gray@gmail.com> Subject: [PATCH v8 04/22] counter: 104-quad-8: Annotate hardware config module parameter Date: Fri, 12 Feb 2021 21:13:28 +0900 [thread overview] Message-ID: <b16b0f7e882a80924d785f022f8ff6b160f9d288.1613131238.git.vilhelm.gray@gmail.com> (raw) In-Reply-To: <cover.1613131238.git.vilhelm.gray@gmail.com> 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. Cc: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> --- 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 f0608b21196a..37551d3016de 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 -- 2.30.0
WARNING: multiple messages have this Message-ID (diff)
From: William Breathitt Gray <vilhelm.gray@gmail.com> To: jic23@kernel.org Cc: kamel.bouhara@bootlin.com, gwendal@chromium.org, a.fatoum@pengutronix.de, david@lechnology.com, linux-iio@vger.kernel.org, patrick.havelange@essensium.com, alexandre.belloni@bootlin.com, mcoquelin.stm32@gmail.com, linux-kernel@vger.kernel.org, o.rempel@pengutronix.de, kernel@pengutronix.de, William Breathitt Gray <vilhelm.gray@gmail.com>, fabrice.gasnier@st.com, syednwaris@gmail.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, alexandre.torgue@st.com Subject: [PATCH v8 04/22] counter: 104-quad-8: Annotate hardware config module parameter Date: Fri, 12 Feb 2021 21:13:28 +0900 [thread overview] Message-ID: <b16b0f7e882a80924d785f022f8ff6b160f9d288.1613131238.git.vilhelm.gray@gmail.com> (raw) In-Reply-To: <cover.1613131238.git.vilhelm.gray@gmail.com> 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. Cc: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> --- 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 f0608b21196a..37551d3016de 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 -- 2.30.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-02-12 12:15 UTC|newest] Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-12 12:13 [PATCH v8 00/22] Introduce the Counter character device interface William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 01/22] docs: counter: Consolidate Counter sysfs attributes documentation William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 16:57 ` Jonathan Cameron 2021-02-14 16:57 ` Jonathan Cameron 2021-02-15 11:05 ` William Breathitt Gray 2021-02-15 11:05 ` William Breathitt Gray 2021-02-20 16:25 ` David Lechner 2021-02-20 16:25 ` David Lechner 2021-02-12 12:13 ` [PATCH v8 02/22] docs: counter: Fix spelling William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-20 16:26 ` David Lechner 2021-02-20 16:26 ` David Lechner 2021-02-12 12:13 ` [PATCH v8 03/22] counter: 104-quad-8: Return error when invalid mode during ceiling_write William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-20 16:30 ` David Lechner 2021-02-20 16:30 ` David Lechner 2021-02-22 2:06 ` William Breathitt Gray 2021-02-22 2:06 ` William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray [this message] 2021-02-12 12:13 ` [PATCH v8 04/22] counter: 104-quad-8: Annotate hardware config module parameter William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 05/22] counter: 104-quad-8: Add const qualifiers for quad8_preset_register_set William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 06/22] counter: 104-quad-8: Add const qualifier for functions_list array William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 07/22] counter: 104-quad-8: Add const qualifier for actions_list array William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 08/22] counter: ftm-quaddec: " William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 09/22] counter: Return error code on invalid modes William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 17:07 ` Jonathan Cameron 2021-02-14 17:07 ` Jonathan Cameron 2021-02-20 16:43 ` David Lechner 2021-02-20 16:43 ` David Lechner 2021-02-22 4:42 ` William Breathitt Gray 2021-02-22 4:42 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 10/22] counter: Standardize to ERANGE for limit exceeded errors William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 17:10 ` Jonathan Cameron 2021-02-14 17:10 ` Jonathan Cameron 2021-02-16 1:26 ` William Breathitt Gray 2021-02-16 1:26 ` William Breathitt Gray 2021-02-21 14:03 ` Jonathan Cameron 2021-02-21 14:03 ` Jonathan Cameron 2021-02-20 16:48 ` David Lechner 2021-02-20 16:48 ` David Lechner 2021-02-12 12:13 ` [PATCH v8 11/22] counter: Rename counter_signal_value to counter_signal_level William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-20 16:52 ` David Lechner 2021-02-20 16:52 ` David Lechner 2021-02-12 12:13 ` [PATCH v8 12/22] counter: Rename counter_count_function to counter_function William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 17:13 ` Jonathan Cameron 2021-02-14 17:13 ` Jonathan Cameron 2021-02-20 16:56 ` David Lechner 2021-02-20 16:56 ` David Lechner 2021-02-23 5:14 ` William Breathitt Gray 2021-02-23 5:14 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 13/22] counter: Internalize sysfs interface code William Breathitt Gray 2021-02-14 17:32 ` Jonathan Cameron 2021-02-14 17:32 ` Jonathan Cameron 2021-02-20 17:50 ` David Lechner 2021-02-20 17:50 ` David Lechner 2021-02-12 12:13 ` [PATCH v8 14/22] counter: Update counter.h comments to reflect sysfs internalization William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 15/22] docs: counter: Update " William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 16/22] counter: Move counter enums to uapi header William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-20 23:55 ` David Lechner 2021-02-20 23:55 ` David Lechner 2021-02-12 12:13 ` [PATCH v8 17/22] counter: Add character device interface William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 18:06 ` Jonathan Cameron 2021-02-14 18:06 ` Jonathan Cameron 2021-02-24 5:34 ` William Breathitt Gray 2021-02-24 5:34 ` William Breathitt Gray 2021-02-15 9:24 ` Oleksij Rempel 2021-02-15 9:24 ` Oleksij Rempel 2021-02-16 1:53 ` William Breathitt Gray 2021-02-16 1:53 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 18/22] docs: counter: Document " William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 17:48 ` Jonathan Cameron 2021-02-14 17:48 ` Jonathan Cameron 2021-02-22 10:11 ` Pavel Machek 2021-02-22 10:11 ` Pavel Machek 2021-02-26 0:27 ` William Breathitt Gray 2021-02-26 0:27 ` William Breathitt Gray 2021-02-26 0:22 ` William Breathitt Gray 2021-02-26 0:22 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 19/22] counter: Implement extension*_name sysfs attributes William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 18:09 ` Jonathan Cameron 2021-02-14 18:09 ` Jonathan Cameron 2021-02-19 8:51 ` William Breathitt Gray 2021-02-19 8:51 ` William Breathitt Gray 2021-02-21 14:05 ` Jonathan Cameron 2021-02-21 14:05 ` Jonathan Cameron 2021-02-25 23:32 ` William Breathitt Gray 2021-02-25 23:32 ` William Breathitt Gray 2021-02-27 15:14 ` Jonathan Cameron 2021-02-27 15:14 ` Jonathan Cameron 2021-02-12 12:13 ` [PATCH v8 20/22] counter: Implement events_queue_size sysfs attribute William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 18:11 ` Jonathan Cameron 2021-02-14 18:11 ` Jonathan Cameron 2021-02-18 10:32 ` William Breathitt Gray 2021-02-18 10:32 ` William Breathitt Gray 2021-02-21 15:51 ` Jonathan Cameron 2021-02-21 15:51 ` Jonathan Cameron 2021-02-26 0:03 ` William Breathitt Gray 2021-02-26 0:03 ` William Breathitt Gray 2021-02-27 0:14 ` David Lechner 2021-02-27 0:14 ` David Lechner 2021-02-27 0:20 ` William Breathitt Gray 2021-02-27 0:20 ` William Breathitt Gray 2021-02-27 15:18 ` Jonathan Cameron 2021-02-27 15:18 ` Jonathan Cameron 2021-02-28 2:46 ` William Breathitt Gray 2021-02-28 2:46 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 21/22] counter: 104-quad-8: Replace mutex with spinlock William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 18:19 ` Jonathan Cameron 2021-02-14 18:19 ` Jonathan Cameron 2021-02-16 2:16 ` William Breathitt Gray 2021-02-16 2:16 ` William Breathitt Gray 2021-02-16 19:27 ` Jonathan Cameron 2021-02-16 19:27 ` Jonathan Cameron 2021-02-18 10:16 ` William Breathitt Gray 2021-02-18 10:16 ` William Breathitt Gray 2021-02-12 12:13 ` [PATCH v8 22/22] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 William Breathitt Gray 2021-02-12 12:13 ` William Breathitt Gray 2021-02-14 18:24 ` Jonathan Cameron 2021-02-14 18:24 ` Jonathan Cameron 2021-02-19 9:21 ` William Breathitt Gray 2021-02-19 9:21 ` William Breathitt Gray
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