From d759f906794b3b2894780870227c3c05895d83c1 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 4 Apr 2017 16:54:22 +0100 Subject: [PATCH] Annotate hardware config module parameters in drivers/gpio/ 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: Alan Cox Signed-off-by: David Howells Acked-by: William Breathitt Gray Acked-by: Linus Walleij cc: Alexandre Courbot cc: linux-gpio@vger.kernel.org --- 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(-) diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c index 17bd2ab..dfa1a29 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 568375a..c369b20 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 7053cf7..5949123 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 fa4baa2..11ade5b 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 901b5cc..f8a4f91 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"); /** -- 2.7.4