netdev - [PATCH 22/39] Annotate hardware config module parameters in drivers/net/wan/

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Date:   Thu, 01 Dec 2016 12:32:35 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     gnomes@...rguk.ukuu.org.uk, minyard@....org,
        netdev@...r.kernel.org, dhowells@...hat.com,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        "Jan \"Yenya\" Kasprzak" <kas@...muni.cz>
Subject: [PATCH 22/39] Annotate hardware config module parameters in
 drivers/net/wan/

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/wan/.

Suggested-by: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: "Jan \"Yenya\" Kasprzak" <kas@...muni.cz>
cc: netdev@...r.kernel.org
---

 drivers/net/wan/cosa.c         |    6 +++---
 drivers/net/wan/hostess_sv11.c |    6 +++---
 drivers/net/wan/sbni.c         |    4 ++--
 drivers/net/wan/sealevel.c     |    8 ++++----
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
index b87fe0a01c69..2f7104e92dd8 100644
--- a/drivers/net/wan/cosa.c
+++ b/drivers/net/wan/cosa.c
@@ -232,11 +232,11 @@ static int irq[MAX_CARDS+1] = { -1, -1, -1, -1, -1, -1, 0, };
 static struct class *cosa_class;
 
 #ifdef MODULE
-module_param_array(io, int, NULL, 0);
+module_param_hw_array(io, int, ioport, NULL, 0);
 MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards");
-module_param_array(irq, int, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
 MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards");
-module_param_array(dma, int, NULL, 0);
+module_param_hw_array(dma, int, dma, NULL, 0);
 MODULE_PARM_DESC(dma, "The DMA channels of the COSA or SRP cards");
 
 MODULE_AUTHOR("Jan \"Yenya\" Kasprzak, <kas@...muni.cz>");
diff --git a/drivers/net/wan/hostess_sv11.c b/drivers/net/wan/hostess_sv11.c
index 3d741663fd67..4845560fd848 100644
--- a/drivers/net/wan/hostess_sv11.c
+++ b/drivers/net/wan/hostess_sv11.c
@@ -325,11 +325,11 @@ static void sv11_shutdown(struct z8530_dev *dev)
 static int io = 0x200;
 static int irq = 9;
 
-module_param(io, int, 0);
+module_param_hw(io, int, ioport, 0);
 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
-module_param(dma, int, 0);
+module_param_hw(dma, int, dma, 0);
 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
-module_param(irq, int, 0);
+module_param_hw(irq, int, irq, 0);
 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
 
 MODULE_AUTHOR("Alan Cox");
diff --git a/drivers/net/wan/sbni.c b/drivers/net/wan/sbni.c
index 3a421ca8a4d0..42220fa78093 100644
--- a/drivers/net/wan/sbni.c
+++ b/drivers/net/wan/sbni.c
@@ -1464,8 +1464,8 @@ set_multicast_list( struct net_device  *dev )
 
 
 #ifdef MODULE
-module_param_array(io, int, NULL, 0);
-module_param_array(irq, int, NULL, 0);
+module_param_hw_array(io, int, ioport, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
 module_param_array(baud, int, NULL, 0);
 module_param_array(rxl, int, NULL, 0);
 module_param_array(mac, int, NULL, 0);
diff --git a/drivers/net/wan/sealevel.c b/drivers/net/wan/sealevel.c
index 27860b4f5908..1d762a2d3ddc 100644
--- a/drivers/net/wan/sealevel.c
+++ b/drivers/net/wan/sealevel.c
@@ -364,13 +364,13 @@ static int rxdma=3;
 static int irq=5;
 static bool slow=false;
 
-module_param(io, int, 0);
+module_param_hw(io, int, ioport, 0);
 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
-module_param(txdma, int, 0);
+module_param_hw(txdma, int, dma, 0);
 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
-module_param(rxdma, int, 0);
+module_param_hw(rxdma, int, dma, 0);
 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
-module_param(irq, int, 0);
+module_param_hw(irq, int, irq, 0);
 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
 module_param(slow, bool, 0);
 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");