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SubjectRe: [PATCH 13/27] asus-wmi: Restrict debugfs interface when the kernel is locked down
On Thu, Oct 19, 2017 at 03:52:11PM +0100, David Howells wrote:
> From: Matthew Garrett <matthew.garrett@nebula.com>
>
> We have no way of validating what all of the Asus WMI methods do on a given
> machine - and there's a risk that some will allow hardware state to be
> manipulated in such a way that arbitrary code can be executed in the
> kernel, circumventing module loading restrictions. Prevent that if the
> kernel is locked down.
>
> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
> Signed-off-by: David Howells <dhowells@redhat.com>

I have reviewed this patch. Please feel free to add:

Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com>

Thanks!
Joey Lee

> cc: acpi4asus-user@lists.sourceforge.net
> cc: platform-driver-x86@vger.kernel.org
> ---
>
> drivers/platform/x86/asus-wmi.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 48e1541dc8d4..ef5587469337 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -1905,6 +1905,9 @@ static int show_dsts(struct seq_file *m, void *data)
> int err;
> u32 retval = -1;
>
> + if (kernel_is_locked_down("Asus WMI"))
> + return -EPERM;
> +
> err = asus_wmi_get_devstate(asus, asus->debug.dev_id, &retval);
>
> if (err < 0)
> @@ -1921,6 +1924,9 @@ static int show_devs(struct seq_file *m, void *data)
> int err;
> u32 retval = -1;
>
> + if (kernel_is_locked_down("Asus WMI"))
> + return -EPERM;
> +
> err = asus_wmi_set_devstate(asus->debug.dev_id, asus->debug.ctrl_param,
> &retval);
>
> @@ -1945,6 +1951,9 @@ static int show_call(struct seq_file *m, void *data)
> union acpi_object *obj;
> acpi_status status;
>
> + if (kernel_is_locked_down("Asus WMI"))
> + return -EPERM;
> +
> status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
> 0, asus->debug.method_id,
> &input, &output);
>
> --
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