From 1fe4593fc29bd68abc3acb1408c5d6854383aacc Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 4 Apr 2017 16:54:25 +0100 Subject: [PATCH] Annotate hardware config module parameters in drivers/net/arcnet/ 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/arcnet/. Suggested-by: Alan Cox Signed-off-by: David Howells cc: Michael Grzeschik cc: netdev@vger.kernel.org Gbp-Pq: Topic features/all/lockdown Gbp-Pq: Name 0017-Annotate-hardware-config-module-parameters-in-driver.patch --- drivers/net/arcnet/com20020-isa.c | 4 ++-- drivers/net/arcnet/com90io.c | 4 ++-- drivers/net/arcnet/com90xx.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/net/arcnet/com20020-isa.c b/drivers/net/arcnet/com20020-isa.c index b9e9931353b..38fa60ddaf2 100644 --- a/drivers/net/arcnet/com20020-isa.c +++ b/drivers/net/arcnet/com20020-isa.c @@ -129,8 +129,8 @@ static int clockp = 0; static int clockm = 0; module_param(node, int, 0); -module_param(io, int, 0); -module_param(irq, int, 0); +module_param_hw(io, int, ioport, 0); +module_param_hw(irq, int, irq, 0); module_param_string(device, device, sizeof(device), 0); module_param(timeout, int, 0); module_param(backplane, int, 0); diff --git a/drivers/net/arcnet/com90io.c b/drivers/net/arcnet/com90io.c index b57863df5bf..4e56aaf2b98 100644 --- a/drivers/net/arcnet/com90io.c +++ b/drivers/net/arcnet/com90io.c @@ -347,8 +347,8 @@ static int io; /* use the insmod io= irq= shmem= options */ static int irq; static char device[9]; /* use eg. device=arc1 to change name */ -module_param(io, int, 0); -module_param(irq, int, 0); +module_param_hw(io, int, ioport, 0); +module_param_hw(irq, int, irq, 0); module_param_string(device, device, sizeof(device), 0); MODULE_LICENSE("GPL"); diff --git a/drivers/net/arcnet/com90xx.c b/drivers/net/arcnet/com90xx.c index 81f90c4703a..ca4a57c30bf 100644 --- a/drivers/net/arcnet/com90xx.c +++ b/drivers/net/arcnet/com90xx.c @@ -88,8 +88,8 @@ static int irq; static int shmem; static char device[9]; /* use eg. device=arc1 to change name */ -module_param(io, int, 0); -module_param(irq, int, 0); +module_param_hw(io, int, ioport, 0); +module_param_hw(irq, int, irq, 0); module_param(shmem, int, 0); module_param_string(device, device, sizeof(device), 0); -- 2.30.2