AcoSail/kernel_optimize_test
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Annotate hardware config module parameters in drivers/i2c/

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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/i2c/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Jean Delvare <jdelvare@suse.de>
cc: linux-i2c@vger.kernel.org
This commit is contained in:
David Howells 2017-04-04 16:54:23 +01:00
parent d759f90679
commit c78babcc7d
8 changed files with 12 additions and 12 deletions
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2
drivers/i2c/busses/i2c-ali15x3.c
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@ -119,7 +119,7 @@
/* If force_addr is set to anything different from 0, we forcibly enable
the device at the given address. */
static u16 force_addr;
module_param(force_addr, ushort, 0);
module_param_hw(force_addr, ushort, ioport, 0);
MODULE_PARM_DESC(force_addr,
"Initialize the base address of the i2c controller");

6
drivers/i2c/busses/i2c-elektor.c
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@ -323,9 +323,9 @@ MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
MODULE_DESCRIPTION("I2C-Bus adapter routines for PCF8584 ISA bus adapter");
MODULE_LICENSE("GPL");
module_param(base, int, 0);
module_param(irq, int, 0);
module_param_hw(base, int, ioport_or_iomem, 0);
module_param_hw(irq, int, irq, 0);
module_param(clock, int, 0);
module_param(own, int, 0);
module_param(mmapped, int, 0);
module_param_hw(mmapped, int, other, 0);
module_isa_driver(i2c_elektor_driver, 1);

4
drivers/i2c/busses/i2c-parport-light.c
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@ -38,11 +38,11 @@
static struct platform_device *pdev;
static u16 base;
module_param(base, ushort, 0);
module_param_hw(base, ushort, ioport, 0);
MODULE_PARM_DESC(base, "Base I/O address");
static int irq;
module_param(irq, int, 0);
module_param_hw(irq, int, irq, 0);
MODULE_PARM_DESC(irq, "IRQ (optional)");
/* ----- Low-level parallel port access ----------------------------------- */

4
drivers/i2c/busses/i2c-pca-isa.c
View File

@ -197,9 +197,9 @@ MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver");
MODULE_LICENSE("GPL");
module_param(base, ulong, 0);
module_param_hw(base, ulong, ioport, 0);
MODULE_PARM_DESC(base, "I/O base address");
module_param(irq, int, 0);
module_param_hw(irq, int, irq, 0);
MODULE_PARM_DESC(irq, "IRQ");
module_param(clock, int, 0);
MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t"

2
drivers/i2c/busses/i2c-piix4.c
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@ -106,7 +106,7 @@ MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
/* If force_addr is set to anything different from 0, we forcibly enable
the PIIX4 at the given address. VERY DANGEROUS! */
static int force_addr;
module_param (force_addr, int, 0);
module_param_hw(force_addr, int, ioport, 0);
MODULE_PARM_DESC(force_addr,
"Forcibly enable the PIIX4 at the given address. "
"EXTREMELY DANGEROUS!");

2
drivers/i2c/busses/i2c-sis5595.c
View File

@ -119,7 +119,7 @@ static int blacklist[] = {
/* If force_addr is set to anything different from 0, we forcibly enable
the device at the given address. */
static u16 force_addr;
module_param(force_addr, ushort, 0);
module_param_hw(force_addr, ushort, ioport, 0);
MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
static struct pci_driver sis5595_driver;

2
drivers/i2c/busses/i2c-viapro.c
View File

@ -94,7 +94,7 @@ MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!");
/* If force_addr is set to anything different from 0, we forcibly enable
the VT596 at the given address. VERY DANGEROUS! */
static u16 force_addr;
module_param(force_addr, ushort, 0);
module_param_hw(force_addr, ushort, ioport, 0);
MODULE_PARM_DESC(force_addr,
"Forcibly enable the SMBus at the given address. "
"EXTREMELY DANGEROUS!");

2
drivers/i2c/busses/scx200_acb.c
View File

@ -42,7 +42,7 @@ MODULE_LICENSE("GPL");
#define MAX_DEVICES 4
static int base[MAX_DEVICES] = { 0x820, 0x840 };
module_param_array(base, int, NULL, 0);
module_param_hw_array(base, int, ioport, NULL, 0);
MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers");
#define POLL_TIMEOUT (HZ/5)