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authorDavid Howells <dhowells@redhat.com>2017-04-04 16:54:22 +0100
committerDavid Howells <dhowells@redhat.com>2017-04-20 12:02:32 +0100
commit1c37ab5e51792a5419bdc84804aec6379cb43adb (patch)
tree13ad0f2727650a1900fdb4165aac90fab86682ca
parent94b599bc07c3c4f365f546218918dcbc363111b2 (diff)
Annotate hardware config module parameters in drivers/char/
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/char/. Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> cc: Arnd Bergmann <arnd@arndb.de>
-rw-r--r--drivers/char/applicom.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/applicom.c b/drivers/char/applicom.c
index e770ad977472..b67263d6e34b 100644
--- a/drivers/char/applicom.c
+++ b/drivers/char/applicom.c
@@ -94,9 +94,9 @@ static struct applicom_board {
static unsigned int irq = 0; /* interrupt number IRQ */
static unsigned long mem = 0; /* physical segment of board */
-module_param(irq, uint, 0);
+module_param_hw(irq, uint, irq, 0);
MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
-module_param(mem, ulong, 0);
+module_param_hw(mem, ulong, iomem, 0);
MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
static unsigned int numboards; /* number of installed boards */