48 lines
2.0 KiB
Diff
48 lines
2.0 KiB
Diff
From: David Howells <dhowells@redhat.com>
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Date: Tue, 4 Apr 2017 16:54:25 +0100
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Subject: [16/62] Annotate hardware config module parameters in
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drivers/net/appletalk/
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Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=78e66f194ab1de8df4088761add8e9e747d8e9c3
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When the kernel is running in secure boot mode, we lock down the kernel to
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prevent userspace from modifying the running kernel image. Whilst this
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includes prohibiting access to things like /dev/mem, it must also prevent
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access by means of configuring driver modules in such a way as to cause a
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device to access or modify the kernel image.
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To this end, annotate module_param* statements that refer to hardware
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configuration and indicate for future reference what type of parameter they
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specify. The parameter parser in the core sees this information and can
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skip such parameters with an error message if the kernel is locked down.
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The module initialisation then runs as normal, but just sees whatever the
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default values for those parameters is.
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Note that we do still need to do the module initialisation because some
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drivers have viable defaults set in case parameters aren't specified and
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some drivers support automatic configuration (e.g. PNP or PCI) in addition
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to manually coded parameters.
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This patch annotates drivers in drivers/net/appletalk/.
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Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
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Signed-off-by: David Howells <dhowells@redhat.com>
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cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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cc: netdev@vger.kernel.org
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[bwh: Drop changes to cops driver, which we removed]
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---
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--- a/drivers/net/appletalk/ltpc.c
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+++ b/drivers/net/appletalk/ltpc.c
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@@ -1231,9 +1231,9 @@ static struct net_device *dev_ltpc;
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MODULE_LICENSE("GPL");
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module_param(debug, int, 0);
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-module_param(io, int, 0);
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-module_param(irq, int, 0);
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-module_param(dma, int, 0);
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+module_param_hw(io, int, ioport, 0);
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+module_param_hw(irq, int, irq, 0);
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+module_param_hw(dma, int, dma, 0);
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static int __init ltpc_module_init(void)
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