From a293541d69cc565eec15819034b49da189fc1a17 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 4 Apr 2017 16:54:28 +0100 Subject: [PATCH] Annotate hardware config module parameters in drivers/staging/media/ 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/media/. Suggested-by: Alan Cox Signed-off-by: David Howells cc: Mauro Carvalho Chehab cc: Greg Kroah-Hartman cc: linux-media@vger.kernel.org cc: devel@driverdev.osuosl.org [bwh: For 4.12, fix up filename and permission format] Gbp-Pq: Topic features/all/lockdown Gbp-Pq: Name 0027-Annotate-hardware-config-module-parameters-in-driver.patch --- drivers/media/rc/sir_ir.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/rc/sir_ir.c b/drivers/media/rc/sir_ir.c index 90a5f8fd5ee..9e1d87cbcac 100644 --- a/drivers/media/rc/sir_ir.c +++ b/drivers/media/rc/sir_ir.c @@ -434,10 +434,10 @@ MODULE_DESCRIPTION("Infrared receiver driver for SIR type serial ports"); MODULE_AUTHOR("Milan Pikula"); MODULE_LICENSE("GPL"); -module_param(io, int, 0444); +module_param_hw(io, int, ioport, 0444); MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)"); -module_param(irq, int, 0444); +module_param_hw(irq, int, irq, 0444); MODULE_PARM_DESC(irq, "Interrupt (4 or 3)"); module_param(threshold, int, 0444); -- 2.30.2