On 12/01/2016 01:32 PM, David Howells 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 drivers in drivers/net/can/.
> Suggested-by: One Thousand Gnomes <gno...@lxorguk.ukuu.org.uk>
> Signed-off-by: David Howells <dhowe...@redhat.com>
> cc: Wolfgang Grandegger <w...@grandegger.com>
> cc: Marc Kleine-Budde <m...@pengutronix.de>
> cc: linux-...@vger.kernel.org
> cc: netdev@vger.kernel.org

Acked-by: Marc Kleine-Budde <m...@pengutronix.de>


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