Annotate hardware config module parameters in drivers/media/

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/media/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
cc: mjpeg-users@lists.sourceforge.net
cc: linux-media@vger.kernel.org

diff --git a/drivers/media/pci/zoran/zoran_card.c b/drivers/media/pci/zoran/zoran_card.c
index 5266755add63de6e9f93876b8ff0e89a4d9416cb..4680f001653a6263ab7f81df47a7928ff069f540 100644 (file)
--- a/drivers/media/pci/zoran/zoran_card.c
+++ b/drivers/media/pci/zoran/zoran_card.c
@@ -69,7 +69,7 @@ MODULE_PARM_DESC(card, "Card type");
  */
 
 static unsigned long vidmem;   /* default = 0 - Video memory base address */
-module_param(vidmem, ulong, 0444);
+module_param_hw(vidmem, ulong, iomem, 0444);
 MODULE_PARM_DESC(vidmem, "Default video memory base address");
 
 /*

diff --git a/drivers/media/rc/serial_ir.c b/drivers/media/rc/serial_ir.c
index 41b54e40176c2393b846a1fb59f6e2cacf187c74..40d305842a9b29e1e220f6e8420d4f14a44f4c09 100644 (file)
--- a/drivers/media/rc/serial_ir.c
+++ b/drivers/media/rc/serial_ir.c
@@ -833,11 +833,11 @@ MODULE_LICENSE("GPL");
 module_param(type, int, 0444);
 MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug");
 
-module_param(io, int, 0444);
+module_param_hw(io, int, ioport, 0444);
 MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
 
 /* some architectures (e.g. intel xscale) have memory mapped registers */
-module_param(iommap, bool, 0444);
+module_param_hw(iommap, bool, other, 0444);
 MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory mapped io)");
 
 /*
@@ -845,13 +845,13 @@ MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory map
  * on 32bit word boundaries.
  * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out()
  */
-module_param(ioshift, int, 0444);
+module_param_hw(ioshift, int, other, 0444);
 MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
 
-module_param(irq, int, 0444);
+module_param_hw(irq, int, irq, 0444);
 MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
 
-module_param(share_irq, bool, 0444);
+module_param_hw(share_irq, bool, other, 0444);
 MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
 
 module_param(sense, int, 0444);