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Annotate hardware config module parameters in drivers/net/can/ 

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/net/can/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
cc: Wolfgang Grandegger <wg@grandegger.com>
cc: linux-can@vger.kernel.org
cc: netdev@vger.kernel.org
This commit is contained in:
David Howells 2017-04-04 16:54:25 +01:00
parent 06a5128a29
commit e43f2c52a0
2 changed files with 8 additions and 8 deletions
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8
drivers/net/can/cc770/cc770_isa.c
View File

@ -82,16 +82,16 @@ static u8 cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
static u8 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
module_param_array(port, ulong, NULL, S_IRUGO);
module_param_hw_array(port, ulong, ioport, NULL, S_IRUGO);
MODULE_PARM_DESC(port, "I/O port number");
module_param_array(mem, ulong, NULL, S_IRUGO);
module_param_hw_array(mem, ulong, iomem, NULL, S_IRUGO);
MODULE_PARM_DESC(mem, "I/O memory address");
module_param_array(indirect, int, NULL, S_IRUGO);
module_param_hw_array(indirect, int, ioport, NULL, S_IRUGO);
MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
module_param_array(irq, int, NULL, S_IRUGO);
module_param_hw_array(irq, int, irq, NULL, S_IRUGO);
MODULE_PARM_DESC(irq, "IRQ number");
module_param_array(clk, int, NULL, S_IRUGO);

8
drivers/net/can/sja1000/sja1000_isa.c
View File

@ -48,16 +48,16 @@ static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */
module_param_array(port, ulong, NULL, S_IRUGO);
module_param_hw_array(port, ulong, ioport, NULL, S_IRUGO);
MODULE_PARM_DESC(port, "I/O port number");
module_param_array(mem, ulong, NULL, S_IRUGO);
module_param_hw_array(mem, ulong, iomem, NULL, S_IRUGO);
MODULE_PARM_DESC(mem, "I/O memory address");
module_param_array(indirect, int, NULL, S_IRUGO);
module_param_hw_array(indirect, int, ioport, NULL, S_IRUGO);
MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
module_param_array(irq, int, NULL, S_IRUGO);
module_param_hw_array(irq, int, irq, NULL, S_IRUGO);
MODULE_PARM_DESC(irq, "IRQ number");
module_param_array(clk, int, NULL, S_IRUGO);