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[v2,24/57,B] Annotate hardware config module parameters in drivers/net/hamradio/

Message ID 20200619161621.644540-25-seth.forshee@canonical.com
State New
Headers show
Series Lockdown updates | expand

Commit Message

Seth Forshee June 19, 2020, 4:15 p.m. UTC 
From: David Howells <dhowells@redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1884159

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/hamradio/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Thomas Sailer <t.sailer@alumni.ethz.ch>
cc: Joerg Reuter <jreuter@yaina.de>
cc: linux-hams@vger.kernel.org
cc: netdev@vger.kernel.org
(cherry picked from commit b658e5d854d4e9015d83133a826ec734770deefb)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
 drivers/net/hamradio/baycom_epp.c     | 2 +-
 drivers/net/hamradio/baycom_par.c     | 2 +-
 drivers/net/hamradio/baycom_ser_fdx.c | 4 ++--
 drivers/net/hamradio/baycom_ser_hdx.c | 4 ++--
 drivers/net/hamradio/dmascc.c         | 2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 72c9f1f352b4..8c5db53e8742 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -1170,7 +1170,7 @@  static int iobase[NR_PORTS] = { 0x378, };
 
 module_param_array(mode, charp, NULL, 0);
 MODULE_PARM_DESC(mode, "baycom operating mode");
-module_param_array(iobase, int, NULL, 0);
+module_param_hw_array(iobase, int, ioport, NULL, 0);
 MODULE_PARM_DESC(iobase, "baycom io base address");
 
 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
diff --git a/drivers/net/hamradio/baycom_par.c b/drivers/net/hamradio/baycom_par.c
index acb636963e90..6f05792f6999 100644
--- a/drivers/net/hamradio/baycom_par.c
+++ b/drivers/net/hamradio/baycom_par.c
@@ -481,7 +481,7 @@  static int iobase[NR_PORTS] = { 0x378, };
 
 module_param_array(mode, charp, NULL, 0);
 MODULE_PARM_DESC(mode, "baycom operating mode; eg. par96 or picpar");
-module_param_array(iobase, int, NULL, 0);
+module_param_hw_array(iobase, int, ioport, NULL, 0);
 MODULE_PARM_DESC(iobase, "baycom io base address");
 
 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
diff --git a/drivers/net/hamradio/baycom_ser_fdx.c b/drivers/net/hamradio/baycom_ser_fdx.c
index 636b65c66d49..6b07ef9ca345 100644
--- a/drivers/net/hamradio/baycom_ser_fdx.c
+++ b/drivers/net/hamradio/baycom_ser_fdx.c
@@ -612,9 +612,9 @@  static int baud[NR_PORTS] = { [0 ... NR_PORTS-1] = 1200 };
 
 module_param_array(mode, charp, NULL, 0);
 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
-module_param_array(iobase, int, NULL, 0);
+module_param_hw_array(iobase, int, ioport, NULL, 0);
 MODULE_PARM_DESC(iobase, "baycom io base address");
-module_param_array(irq, int, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
 MODULE_PARM_DESC(irq, "baycom irq number");
 module_param_array(baud, int, NULL, 0);
 MODULE_PARM_DESC(baud, "baycom baud rate (300 to 4800)");
diff --git a/drivers/net/hamradio/baycom_ser_hdx.c b/drivers/net/hamradio/baycom_ser_hdx.c
index f9a8976195ba..1b310493ba8a 100644
--- a/drivers/net/hamradio/baycom_ser_hdx.c
+++ b/drivers/net/hamradio/baycom_ser_hdx.c
@@ -642,9 +642,9 @@  static int irq[NR_PORTS] = { 4, };
 
 module_param_array(mode, charp, NULL, 0);
 MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
-module_param_array(iobase, int, NULL, 0);
+module_param_hw_array(iobase, int, ioport, NULL, 0);
 MODULE_PARM_DESC(iobase, "baycom io base address");
-module_param_array(irq, int, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
 MODULE_PARM_DESC(irq, "baycom irq number");
 
 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
diff --git a/drivers/net/hamradio/dmascc.c b/drivers/net/hamradio/dmascc.c
index c3d377770616..bf52868aee38 100644
--- a/drivers/net/hamradio/dmascc.c
+++ b/drivers/net/hamradio/dmascc.c
@@ -274,7 +274,7 @@  static unsigned long rand;
 
 MODULE_AUTHOR("Klaus Kudielka");
 MODULE_DESCRIPTION("Driver for high-speed SCC boards");
-module_param_array(io, int, NULL, 0);
+module_param_hw_array(io, int, ioport, NULL, 0);
 MODULE_LICENSE("GPL");
 
 static void __exit dmascc_exit(void)