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authorDavid Howells <dhowells@redhat.com>2017-04-04 18:54:21 +0300
committerDavid Howells <dhowells@redhat.com>2017-04-20 14:02:32 +0300
commit94b599bc07c3c4f365f546218918dcbc363111b2 (patch)
tree88253bf4d69594b2018881ff1be079f5f3fd9427
parent684497bfe8b4485325554b96b160b5ddb6e9ebaf (diff)
downloadlinux-94b599bc07c3c4f365f546218918dcbc363111b2.tar.xz
Annotate hardware config module parameters in drivers/char/mwave/
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/char/mwave/. Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: David Howells <dhowells@redhat.com>
-rw-r--r--drivers/char/mwave/mwavedd.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/mwave/mwavedd.c b/drivers/char/mwave/mwavedd.c
index 3a3ff2eb6cba..b5e3103c1175 100644
--- a/drivers/char/mwave/mwavedd.c
+++ b/drivers/char/mwave/mwavedd.c
@@ -80,10 +80,10 @@ int mwave_3780i_io = 0;
int mwave_uart_irq = 0;
int mwave_uart_io = 0;
module_param(mwave_debug, int, 0);
-module_param(mwave_3780i_irq, int, 0);
-module_param(mwave_3780i_io, int, 0);
-module_param(mwave_uart_irq, int, 0);
-module_param(mwave_uart_io, int, 0);
+module_param_hw(mwave_3780i_irq, int, irq, 0);
+module_param_hw(mwave_3780i_io, int, ioport, 0);
+module_param_hw(mwave_uart_irq, int, irq, 0);
+module_param_hw(mwave_uart_io, int, ioport, 0);
static int mwave_open(struct inode *inode, struct file *file);
static int mwave_close(struct inode *inode, struct file *file);