diff options
| author | David Howells <dhowells@redhat.com> | 2017-04-04 16:54:30 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-04-20 12:02:32 +0100 |
| commit | 232b0b0829fa4f22172750a6e2a36867583da285 (patch) | |
| tree | b24eaabb23d36b169da797d3843f0bc0bd1f6123 /sound/oss/mpu401.c | |
| parent | e992ef5705c1e154acb248869b39e0be4c003a8b (diff) | |
Annotate hardware config module parameters in sound/oss/
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 sound/oss/.
Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jaroslav Kysela <perex@perex.cz>
cc: Takashi Iwai <tiwai@suse.com>
cc: Andrew Veliath <andrewtv@usa.net>
cc: alsa-devel@alsa-project.org
Diffstat (limited to 'sound/oss/mpu401.c')
| -rw-r--r-- | sound/oss/mpu401.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/oss/mpu401.c b/sound/oss/mpu401.c index 862735005b43..20e8fa46f647 100644 --- a/sound/oss/mpu401.c +++ b/sound/oss/mpu401.c @@ -1748,8 +1748,8 @@ static struct address_info cfg; static int io = -1; static int irq = -1; -module_param(irq, int, 0); -module_param(io, int, 0); +module_param_hw(irq, int, irq, 0); +module_param_hw(io, int, ioport, 0); static int __init init_mpu401(void) { |