diff mbox

[23/39] Annotate hardware config module parameters in drivers/net/wireless/

Message ID 148059556349.31612.1087071308520573382.stgit@warthog.procyon.org.uk
State New
Headers show

Commit Message

David Howells Dec. 1, 2016, 12:32 p.m. UTC
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/wireless/.

Suggested-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Kalle Valo <kvalo@codeaurora.org>
cc: linux-wireless@vger.kernel.org
cc: netdev@vger.kernel.org
---

 drivers/net/wireless/cisco/airo.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)


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Comments

Kalle Valo Dec. 2, 2016, 5:04 a.m. UTC | #1
David Howells <dhowells@redhat.com> writes:

> 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/wireless/.
>
> Suggested-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Kalle Valo <kvalo@codeaurora.org>
> cc: linux-wireless@vger.kernel.org
> cc: netdev@vger.kernel.org
> ---
>
>  drivers/net/wireless/cisco/airo.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Via which tree are you planning to submit this, should I take it to
wireless-drivers or will someone else handle it? I didn't get the cover
letter so I have no idea.
David Howells Dec. 7, 2016, 1:45 p.m. UTC | #2
Kalle Valo <kvalo@codeaurora.org> wrote:

> Via which tree are you planning to submit this, should I take it to
> wireless-drivers or will someone else handle it? I didn't get the cover
> letter so I have no idea.

I'll see if I can get patch 1 (which defines the macros) in a window prior to
the others - or maybe I can get Linus to apply all of these together.

David
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diff mbox

Patch

diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index 69b826d229c5..53d43c93a284 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -246,8 +246,8 @@  MODULE_DESCRIPTION("Support for Cisco/Aironet 802.11 wireless ethernet cards.  "
 		   "Direct support for ISA/PCI/MPI cards and support for PCMCIA when used with airo_cs.");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_SUPPORTED_DEVICE("Aironet 4500, 4800 and Cisco 340/350");
-module_param_array(io, int, NULL, 0);
-module_param_array(irq, int, NULL, 0);
+module_param_hw_array(io, int, ioport, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
 module_param_array(rates, int, NULL, 0);
 module_param_array(ssids, charp, NULL, 0);
 module_param(auto_wep, int, 0);