Commit 4081f00d authored by Henrique de Moraes Holschuh's avatar Henrique de Moraes Holschuh Committed by John W. Linville
Browse files

rfkill: do not allow userspace to override ALL RADIOS OFF 



SW_RFKILL_ALL is the "emergency power-off all radios" input event.  It must
be handled, and must always do the same thing as far as the rfkill system
is concerned: all transmitters are to go *immediately* offline.

For safety, do NOT allow userspace to override EV_SW SW_RFKILL_ALL OFF.  As
long as rfkill-input is loaded, that event will *always* be processed, and
it will *always* force all rfkill switches to disable all wireless
transmitters, regardless of user_claim attribute or anything else.

Signed-off-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: default avatarIvo van Doorn <IvDoorn@gmail.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent fbc6af2f

net/rfkill/rfkill-input.c

+32 −15
Original line number Diff line number Diff line
@@ -43,11 +43,26 @@ static void rfkill_task_handler(struct work_struct *work) 
	mutex_unlock(&task->mutex);

}



static void rfkill_task_epo_handler(struct work_struct *work)

{

	rfkill_epo();

}



static DECLARE_WORK(epo_work, rfkill_task_epo_handler);



static void rfkill_schedule_epo(void)

{

	schedule_work(&epo_work);

}



static void rfkill_schedule_set(struct rfkill_task *task,

				enum rfkill_state desired_state)

{

	unsigned long flags;



	if (unlikely(work_pending(&epo_work)))

		return;



	spin_lock_irqsave(&task->lock, flags);



	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
@@ -63,6 +78,9 @@ static void rfkill_schedule_toggle(struct rfkill_task *task) 
{

	unsigned long flags;



	if (unlikely(work_pending(&epo_work)))

		return;



	spin_lock_irqsave(&task->lock, flags);



	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
@@ -114,21 +132,20 @@ static void rfkill_event(struct input_handle *handle, unsigned int type, 
		switch (code) {

		case SW_RFKILL_ALL:

			/* EVERY radio type. data != 0 means radios ON */

			/* handle EPO (emergency power off) through shortcut */

			if (data) {

				rfkill_schedule_set(&rfkill_wwan,

					    (data)? RFKILL_STATE_ON:

						    RFKILL_STATE_OFF);

						    RFKILL_STATE_ON);

				rfkill_schedule_set(&rfkill_wimax,

					    (data)? RFKILL_STATE_ON:

						    RFKILL_STATE_OFF);

						    RFKILL_STATE_ON);

				rfkill_schedule_set(&rfkill_uwb,

					    (data)? RFKILL_STATE_ON:

						    RFKILL_STATE_OFF);

						    RFKILL_STATE_ON);

				rfkill_schedule_set(&rfkill_bt,

					    (data)? RFKILL_STATE_ON:

						    RFKILL_STATE_OFF);

						    RFKILL_STATE_ON);

				rfkill_schedule_set(&rfkill_wlan,

					    (data)? RFKILL_STATE_ON:

						    RFKILL_STATE_OFF);

						    RFKILL_STATE_ON);

			} else

				rfkill_schedule_epo();

			break;

		default:

			break;

net/rfkill/rfkill-input.h

+1 −0
Original line number Diff line number Diff line
@@ -12,5 +12,6 @@ 
#define __RFKILL_INPUT_H



void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state);

void rfkill_epo(void);



#endif /* __RFKILL_INPUT_H */

net/rfkill/rfkill.c

+18 −0
Original line number Diff line number Diff line
@@ -181,6 +181,24 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) 
}

EXPORT_SYMBOL(rfkill_switch_all);



/**

 * rfkill_epo - emergency power off all transmitters

 *

 * This kicks all rfkill devices to RFKILL_STATE_OFF, ignoring

 * everything in its path but rfkill_mutex.

 */

void rfkill_epo(void)

{

	struct rfkill *rfkill;



	mutex_lock(&rfkill_mutex);

	list_for_each_entry(rfkill, &rfkill_list, node) {

		rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF, 1);

	}

	mutex_unlock(&rfkill_mutex);

}

EXPORT_SYMBOL_GPL(rfkill_epo);



/**

 * rfkill_force_state - Force the internal rfkill radio state

 * @rfkill: pointer to the rfkill class to modify.

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