Annotate hardware config module parameters in drivers/tty/

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/tty/.

Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Jiri Slaby <jslaby@suse.com>
cc: linux-serial@vger.kernel.org

Gbp-Pq: Topic features/all/lockdown
Gbp-Pq: Name 0031-Annotate-hardware-config-module-parameters-in-driver.patch

diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
index c40a5c49b20d468674712c51f6567c9789cb3811..1370e9b20ba84bfef8e94c92dd39406c6cee0a36 100644 (file)
--- a/drivers/tty/cyclades.c
+++ b/drivers/tty/cyclades.c
@@ -156,8 +156,8 @@ static unsigned int cy_isa_addresses[] = {
 static long maddr[NR_CARDS];
 static int irq[NR_CARDS];
 
-module_param_array(maddr, long, NULL, 0);
-module_param_array(irq, int, NULL, 0);
+module_param_hw_array(maddr, long, iomem, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
 
 #endif                         /* CONFIG_ISA */
 

diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index 068f022af24be00c79115feacb3cac984e62785a..e90e958faf5cb4e8906a971001e19fe242747f61 100644 (file)
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -179,7 +179,7 @@ MODULE_FIRMWARE("c320tunx.cod");
 
 module_param_array(type, uint, NULL, 0);
 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
-module_param_array(baseaddr, ulong, NULL, 0);
+module_param_hw_array(baseaddr, ulong, ioport, NULL, 0);
 MODULE_PARM_DESC(baseaddr, "base address");
 module_param_array(numports, uint, NULL, 0);
 MODULE_PARM_DESC(numports, "numports (ignored for C218)");

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 7b8f383fb090ca8836e0fbc58fff80c190cb516b..8bd6fb6d9391fe419e0a2553ffe6f82f59c469fe 100644 (file)
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -183,7 +183,7 @@ static int ttymajor = MXSERMAJOR;
 
 MODULE_AUTHOR("Casper Yang");
 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
-module_param_array(ioaddr, ulong, NULL, 0);
+module_param_hw_array(ioaddr, ulong, ioport, NULL, 0);
 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 module_param(ttymajor, int, 0);
 MODULE_LICENSE("GPL");

diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index d66c1edd98926d5d410895ba8a39b1ed82d10340..b51a877da986d90719cdad9d0dfd7a1e148088e1 100644 (file)
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -250,15 +250,15 @@ static int sReadAiopNumChan(WordIO_t io);
 
 MODULE_AUTHOR("Theodore Ts'o");
 MODULE_DESCRIPTION("Comtrol RocketPort driver");
-module_param(board1, ulong, 0);
+module_param_hw(board1, ulong, ioport, 0);
 MODULE_PARM_DESC(board1, "I/O port for (ISA) board #1");
-module_param(board2, ulong, 0);
+module_param_hw(board2, ulong, ioport, 0);
 MODULE_PARM_DESC(board2, "I/O port for (ISA) board #2");
-module_param(board3, ulong, 0);
+module_param_hw(board3, ulong, ioport, 0);
 MODULE_PARM_DESC(board3, "I/O port for (ISA) board #3");
-module_param(board4, ulong, 0);
+module_param_hw(board4, ulong, ioport, 0);
 MODULE_PARM_DESC(board4, "I/O port for (ISA) board #4");
-module_param(controller, ulong, 0);
+module_param_hw(controller, ulong, ioport, 0);
 MODULE_PARM_DESC(controller, "I/O port for (ISA) rocketport controller");
 module_param(support_low_speed, bool, 0);
 MODULE_PARM_DESC(support_low_speed, "1 means support 50 baud, 0 means support 460400 baud");

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 76e03a7de9cc3d790a230948f599ef2db4b93249..89fde17d96175abf3bd41c823bb70855285059d2 100644 (file)
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1191,7 +1191,7 @@ module_exit(serial8250_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
 
-module_param(share_irqs, uint, 0644);
+module_param_hw(share_irqs, uint, other, 0644);
 MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");
 
 module_param(nr_uarts, uint, 0644);
@@ -1201,7 +1201,7 @@ module_param(skip_txen_test, uint, 0644);
 MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
 
 #ifdef CONFIG_SERIAL_8250_RSA
-module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444);
+module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
 MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
 #endif
 MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);

diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 657eed82eeb372d96e5f480bae3eb7c92dee06fa..a2c308f7d6374515bf8a0ac0a9e6ea8b59f5032b 100644 (file)
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -869,9 +869,9 @@ static int txholdbufs[MAX_TOTAL_DEVICES];
        
 module_param(break_on_load, bool, 0);
 module_param(ttymajor, int, 0);
-module_param_array(io, int, NULL, 0);
-module_param_array(irq, int, NULL, 0);
-module_param_array(dma, int, NULL, 0);
+module_param_hw_array(io, int, ioport, NULL, 0);
+module_param_hw_array(irq, int, irq, NULL, 0);
+module_param_hw_array(dma, int, dma, NULL, 0);
 module_param(debug_level, int, 0);
 module_param_array(maxframe, int, NULL, 0);
 module_param_array(txdmabufs, int, NULL, 0);