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| author | David Howells <dhowells@redhat.com> | 2017-04-04 17:54:30 +0200 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-04-20 13:02:32 +0200 |
| commit | 6192c41fc608b0a58d5540b015aa1672c266f3c5 (patch) | |
| tree | d540aa76bfb291fe2c65eb6f96b54eb94a3c01a5 /sound/pci/cmipci.c | |
| parent | Annotate hardware config module parameters in sound/oss/ (diff) | |
| download | linux-6192c41fc608b0a58d5540b015aa1672c266f3c5.tar.xz linux-6192c41fc608b0a58d5540b015aa1672c266f3c5.zip | |
Annotate hardware config module parameters in sound/pci/
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/pci/.
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: alsa-devel@alsa-project.org
Diffstat (limited to 'sound/pci/cmipci.c')
| -rw-r--r-- | sound/pci/cmipci.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sound/pci/cmipci.c b/sound/pci/cmipci.c index aeedc270ed9b..430f064c64da 100644 --- a/sound/pci/cmipci.c +++ b/sound/pci/cmipci.c @@ -68,14 +68,14 @@ module_param_array(id, charp, NULL, 0444); MODULE_PARM_DESC(id, "ID string for C-Media PCI soundcard."); module_param_array(enable, bool, NULL, 0444); MODULE_PARM_DESC(enable, "Enable C-Media PCI soundcard."); -module_param_array(mpu_port, long, NULL, 0444); +module_param_hw_array(mpu_port, long, ioport, NULL, 0444); MODULE_PARM_DESC(mpu_port, "MPU-401 port."); -module_param_array(fm_port, long, NULL, 0444); +module_param_hw_array(fm_port, long, ioport, NULL, 0444); MODULE_PARM_DESC(fm_port, "FM port."); module_param_array(soft_ac3, bool, NULL, 0444); MODULE_PARM_DESC(soft_ac3, "Software-conversion of raw SPDIF packets (model 033 only)."); #ifdef SUPPORT_JOYSTICK -module_param_array(joystick_port, int, NULL, 0444); +module_param_hw_array(joystick_port, int, ioport, NULL, 0444); MODULE_PARM_DESC(joystick_port, "Joystick port address."); #endif |