linux-kernel - [PATCH 30/39] Annotate hardware config module parameters in drivers/staging/speakup/

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Date:   Thu, 01 Dec 2016 12:33:37 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     devel@...verdev.osuosl.org, gnomes@...rguk.ukuu.org.uk,
        minyard@....org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        speakup@...ux-speakup.org, dhowells@...hat.com,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Subject: [PATCH 30/39] Annotate hardware config module parameters in
 drivers/staging/speakup/

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/staging/speakup/.

Suggested-by: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc: speakup@...ux-speakup.org
cc: devel@...verdev.osuosl.org
---

 drivers/staging/speakup/speakup_acntpc.c |    2 +-
 drivers/staging/speakup/speakup_dtlk.c   |    2 +-
 drivers/staging/speakup/speakup_keypc.c  |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/speakup/speakup_acntpc.c b/drivers/staging/speakup/speakup_acntpc.c
index efb791bb642b..e7bbc03e4a4f 100644
--- a/drivers/staging/speakup/speakup_acntpc.c
+++ b/drivers/staging/speakup/speakup_acntpc.c
@@ -307,7 +307,7 @@ static void accent_release(void)
 	speakup_info.port_tts = 0;
 }
 
-module_param_named(port, port_forced, int, S_IRUGO);
+module_param_hw_named(port, port_forced, int, ioport, S_IRUGO);
 module_param_named(start, synth_acntpc.startup, short, S_IRUGO);
 
 MODULE_PARM_DESC(port, "Set the port for the synthesizer (override probing).");
diff --git a/drivers/staging/speakup/speakup_dtlk.c b/drivers/staging/speakup/speakup_dtlk.c
index 38aa4013bf62..d04aa9e0a147 100644
--- a/drivers/staging/speakup/speakup_dtlk.c
+++ b/drivers/staging/speakup/speakup_dtlk.c
@@ -378,7 +378,7 @@ static void dtlk_release(void)
 	speakup_info.port_tts = 0;
 }
 
-module_param_named(port, port_forced, int, S_IRUGO);
+module_param_hw_named(port, port_forced, int, ioport, S_IRUGO);
 module_param_named(start, synth_dtlk.startup, short, S_IRUGO);
 
 MODULE_PARM_DESC(port, "Set the port for the synthesizer (override probing).");
diff --git a/drivers/staging/speakup/speakup_keypc.c b/drivers/staging/speakup/speakup_keypc.c
index 5e2170bf4a8b..d245c7de5ee6 100644
--- a/drivers/staging/speakup/speakup_keypc.c
+++ b/drivers/staging/speakup/speakup_keypc.c
@@ -309,7 +309,7 @@ static void keynote_release(void)
 	synth_port = 0;
 }
 
-module_param_named(port, port_forced, int, S_IRUGO);
+module_param_hw_named(port, port_forced, int, ioport, S_IRUGO);
 module_param_named(start, synth_keypc.startup, short, S_IRUGO);
 
 MODULE_PARM_DESC(port, "Set the port for the synthesizer (override probing).");