linux-kernel - [PATCH 11/38] Annotate hardware config module parameters in drivers/input/

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Message-ID: <149141150295.29162.10580790231116897238.stgit@warthog.procyon.org.uk>
Date:   Wed, 05 Apr 2017 17:58:23 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     gnomes@...rguk.ukuu.org.uk, gregkh@...uxfoundation.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        dhowells@...hat.com, linux-security-module@...r.kernel.org,
        keyrings@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH 11/38] Annotate hardware config module parameters in
 drivers/input/

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/input/.

Suggested-by: Alan Cox <gnomes@...rguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
cc: linux-input@...r.kernel.org
---

 drivers/input/mouse/inport.c      |    2 +-
 drivers/input/mouse/logibm.c      |    2 +-
 drivers/input/touchscreen/mk712.c |    4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/input/mouse/inport.c b/drivers/input/mouse/inport.c
index 3827a22362de..9ce71dfa0de1 100644
--- a/drivers/input/mouse/inport.c
+++ b/drivers/input/mouse/inport.c
@@ -78,7 +78,7 @@ MODULE_LICENSE("GPL");
 #define INPORT_IRQ		5
 
 static int inport_irq = INPORT_IRQ;
-module_param_named(irq, inport_irq, uint, 0);
+module_param_hw_named(irq, inport_irq, uint, irq, 0);
 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
 
 static struct input_dev *inport_dev;
diff --git a/drivers/input/mouse/logibm.c b/drivers/input/mouse/logibm.c
index e2413113df22..6f165e053f4d 100644
--- a/drivers/input/mouse/logibm.c
+++ b/drivers/input/mouse/logibm.c
@@ -69,7 +69,7 @@ MODULE_LICENSE("GPL");
 #define LOGIBM_IRQ		5
 
 static int logibm_irq = LOGIBM_IRQ;
-module_param_named(irq, logibm_irq, uint, 0);
+module_param_hw_named(irq, logibm_irq, uint, irq, 0);
 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
 
 static struct input_dev *logibm_dev;
diff --git a/drivers/input/touchscreen/mk712.c b/drivers/input/touchscreen/mk712.c
index 36e57deacd03..bd5352824f77 100644
--- a/drivers/input/touchscreen/mk712.c
+++ b/drivers/input/touchscreen/mk712.c
@@ -50,11 +50,11 @@ MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
 MODULE_LICENSE("GPL");
 
 static unsigned int mk712_io = 0x260;	/* Also 0x200, 0x208, 0x300 */
-module_param_named(io, mk712_io, uint, 0);
+module_param_hw_named(io, mk712_io, uint, ioport, 0);
 MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
 
 static unsigned int mk712_irq = 10;	/* Also 12, 14, 15 */
-module_param_named(irq, mk712_irq, uint, 0);
+module_param_hw_named(irq, mk712_irq, uint, irq, 0);
 MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
 
 /* eight 8-bit registers */