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Commit 310d2b41 authored by Stefan Koch's avatar Stefan Koch Committed by Greg Kroah-Hartman
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usb: interface authorization: SysFS part of USB interface authorization 



This introduces an attribute for each interface to
authorize (1) or deauthorize (0) it:
/sys/bus/usb/devices/INTERFACE/authorized

Signed-off-by: default avatarStefan Koch <stefan.koch10@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b3910cef

drivers/usb/core/sysfs.c

+36 −0
Original line number Diff line number Diff line
@@ -957,6 +957,41 @@ static ssize_t supports_autosuspend_show(struct device *dev, 
}

static DEVICE_ATTR_RO(supports_autosuspend);



/*

 * interface_authorized_show - show authorization status of an USB interface

 * 1 is authorized, 0 is deauthorized

 */

static ssize_t interface_authorized_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct usb_interface *intf = to_usb_interface(dev);



	return sprintf(buf, "%u\n", intf->authorized);

}



/*

 * interface_authorized_store - authorize or deauthorize an USB interface

 */

static ssize_t interface_authorized_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	struct usb_interface *intf = to_usb_interface(dev);

	bool val;



	if (strtobool(buf, &val) != 0)

		return -EINVAL;



	if (val)

		usb_authorize_interface(intf);

	else

		usb_deauthorize_interface(intf);



	return count;

}

static struct device_attribute dev_attr_interface_authorized =

		__ATTR(authorized, S_IRUGO | S_IWUSR,

		interface_authorized_show, interface_authorized_store);



static struct attribute *intf_attrs[] = {

	&dev_attr_bInterfaceNumber.attr,

	&dev_attr_bAlternateSetting.attr,
@@ -966,6 +1001,7 @@ static struct attribute *intf_attrs[] = { 
	&dev_attr_bInterfaceProtocol.attr,

	&dev_attr_modalias.attr,

	&dev_attr_supports_autosuspend.attr,

	&dev_attr_interface_authorized.attr,

	NULL,

};

static struct attribute_group intf_attr_grp = {