From 684497bfe8b4485325554b96b160b5ddb6e9ebaf Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 4 Apr 2017 16:54:21 +0100 Subject: Annotate hardware config module parameters in drivers/char/ipmi/ 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/ipmi/. Suggested-by: Alan Cox Signed-off-by: David Howells Reviewed-by: Corey Minyard cc: openipmi-developer@lists.sourceforge.net --- drivers/char/ipmi/ipmi_si_intf.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'drivers/char') diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 2a7c425ddfa7..e2f34eb59998 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -1375,39 +1375,39 @@ MODULE_PARM_DESC(type, "Defines the type of each interface, each" " interface separated by commas. The types are 'kcs'," " 'smic', and 'bt'. For example si_type=kcs,bt will set" " the first interface to kcs and the second to bt"); -module_param_array(addrs, ulong, &num_addrs, 0); +module_param_hw_array(addrs, ulong, iomem, &num_addrs, 0); MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the" " addresses separated by commas. Only use if an interface" " is in memory. Otherwise, set it to zero or leave" " it blank."); -module_param_array(ports, uint, &num_ports, 0); +module_param_hw_array(ports, uint, ioport, &num_ports, 0); MODULE_PARM_DESC(ports, "Sets the port address of each interface, the" " addresses separated by commas. Only use if an interface" " is a port. Otherwise, set it to zero or leave" " it blank."); -module_param_array(irqs, int, &num_irqs, 0); +module_param_hw_array(irqs, int, irq, &num_irqs, 0); MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the" " addresses separated by commas. Only use if an interface" " has an interrupt. Otherwise, set it to zero or leave" " it blank."); -module_param_array(regspacings, int, &num_regspacings, 0); +module_param_hw_array(regspacings, int, other, &num_regspacings, 0); MODULE_PARM_DESC(regspacings, "The number of bytes between the start address" " and each successive register used by the interface. For" " instance, if the start address is 0xca2 and the spacing" " is 2, then the second address is at 0xca4. Defaults" " to 1."); -module_param_array(regsizes, int, &num_regsizes, 0); +module_param_hw_array(regsizes, int, other, &num_regsizes, 0); MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes." " This should generally be 1, 2, 4, or 8 for an 8-bit," " 16-bit, 32-bit, or 64-bit register. Use this if you" " the 8-bit IPMI register has to be read from a larger" " register."); -module_param_array(regshifts, int, &num_regshifts, 0); +module_param_hw_array(regshifts, int, other, &num_regshifts, 0); MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the." " IPMI register, in bits. For instance, if the data" " is read from a 32-bit word and the IPMI data is in" " bit 8-15, then the shift would be 8"); -module_param_array(slave_addrs, int, &num_slave_addrs, 0); +module_param_hw_array(slave_addrs, int, other, &num_slave_addrs, 0); MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for" " the controller. Normally this is 0x20, but can be" " overridden by this parm. This is an array indexed" -- cgit v1.2.3