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: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 32 insertions, 15 deletions

diff --git a/net/rfkill/rfkill-input.c b/net/rfkill/rfkill-input.c
index d285f9a9d829..5d4c8b2446f7 100644
--- a/net/rfkill/rfkill-input.c
+++ b/net/rfkill/rfkill-input.c
@@ -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 */
-                        rfkill_schedule_set(&rfkill_wwan,
-                                            (data)? RFKILL_STATE_ON:
-                                                    RFKILL_STATE_OFF);
-                        rfkill_schedule_set(&rfkill_wimax,
-                                            (data)? RFKILL_STATE_ON:
-                                                    RFKILL_STATE_OFF);
-                        rfkill_schedule_set(&rfkill_uwb,
-                                            (data)? RFKILL_STATE_ON:
-                                                    RFKILL_STATE_OFF);
-                        rfkill_schedule_set(&rfkill_bt,
-                                            (data)? RFKILL_STATE_ON:
-                                                    RFKILL_STATE_OFF);
-                        rfkill_schedule_set(&rfkill_wlan,
-                                            (data)? RFKILL_STATE_ON:
-                                                    RFKILL_STATE_OFF);
+                        /* handle EPO (emergency power off) through shortcut */
+                        if (data) {
+                                rfkill_schedule_set(&rfkill_wwan,
+                                                    RFKILL_STATE_ON);
+                                rfkill_schedule_set(&rfkill_wimax,
+                                                    RFKILL_STATE_ON);
+                                rfkill_schedule_set(&rfkill_uwb,
+                                                    RFKILL_STATE_ON);
+                                rfkill_schedule_set(&rfkill_bt,
+                                                    RFKILL_STATE_ON);
+                                rfkill_schedule_set(&rfkill_wlan,
+                                                    RFKILL_STATE_ON);
+                        } else
+                                rfkill_schedule_epo();
                         break;
                 default:
                         break;