Skip to content
Commit af383bb1 authored by William Breathitt Gray's avatar William Breathitt Gray Committed by Jonathan Cameron
Browse files

counter: 104-quad-8: Annotate hardware config module parameter



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: default avatarSyed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: default avatarWilliam Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/97ce79878a26809f0b15b2eac9a86ca39e0ecd74.1623201081.git.vilhelm.gray@gmail.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent eb8eaa27
Loading
Loading
Loading
Loading
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Please to comment