From 8863b3e785b8054b981760e26e63a25897467c42 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 4 Apr 2017 16:54:23 +0100 Subject: [PATCH] Annotate hardware config module parameters in drivers/iio/ 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/iio/. Suggested-by: Alan Cox Signed-off-by: David Howells Acked-by: William Breathitt Gray Acked-by: Jonathan Cameron cc: linux-iio@vger.kernel.org --- drivers/iio/adc/stx104.c | 2 +- drivers/iio/dac/cio-dac.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/stx104.c b/drivers/iio/adc/stx104.c index be2de48844bc..7dd396f88f6b 100644 --- a/drivers/iio/adc/stx104.c +++ b/drivers/iio/adc/stx104.c @@ -49,7 +49,7 @@ static unsigned int base[max_num_isa_dev(STX104_EXTENT)]; static unsigned int num_stx104; -module_param_array(base, uint, &num_stx104, 0); +module_param_hw_array(base, uint, ioport, &num_stx104, 0); MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses"); /** diff --git a/drivers/iio/dac/cio-dac.c b/drivers/iio/dac/cio-dac.c index 5a743e2a779d..dac086129edf 100644 --- a/drivers/iio/dac/cio-dac.c +++ b/drivers/iio/dac/cio-dac.c @@ -39,7 +39,7 @@ static unsigned int base[max_num_isa_dev(CIO_DAC_EXTENT)]; static unsigned int num_cio_dac; -module_param_array(base, uint, &num_cio_dac, 0); +module_param_hw_array(base, uint, ioport, &num_cio_dac, 0); MODULE_PARM_DESC(base, "Measurement Computing CIO-DAC base addresses"); /** -- 2.39.2