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[v2,12/57,X] Annotate hardware config module parameters in drivers/cpufreq/

Message ID 20200619165010.645925-13-seth.forshee@canonical.com
State New
Headers show
Series Lockdown updates | expand

Commit Message

Seth Forshee June 19, 2020, 4:49 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/cpufreq/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
cc: linux-pm@vger.kernel.org
(cherry picked from commit 40059ec6701bd10d7d972ed302cca61cf8b6f2cf)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
 drivers/cpufreq/speedstep-smi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/cpufreq/speedstep-smi.c b/drivers/cpufreq/speedstep-smi.c
index 819229e824fb..b5691317b6dd 100644
--- a/drivers/cpufreq/speedstep-smi.c
+++ b/drivers/cpufreq/speedstep-smi.c
@@ -377,7 +377,7 @@  static void __exit speedstep_exit(void)
 	cpufreq_unregister_driver(&speedstep_driver);
 }
 
-module_param(smi_port, int, 0444);
+module_param_hw(smi_port, int, ioport, 0444);
 module_param(smi_cmd,  int, 0444);
 module_param(smi_sig, uint, 0444);