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authorDavid Howells2017-04-04 16:54:30 +0100
committerDavid Howells2017-04-20 12:02:32 +0100
commit232b0b0829fa4f22172750a6e2a36867583da285 (patch)
treeb24eaabb23d36b169da797d3843f0bc0bd1f6123 /sound/pci
parente992ef5705c1e154acb248869b39e0be4c003a8b (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/pci')
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