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rfkill: do not allow userspace to override ALL RADIOS OFF

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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>
This commit is contained in:
Henrique de Moraes Holschuh 2008-06-23 17:23:07 -03:00 committed by John W. Linville
parent fbc6af2f3c
commit 4081f00dc4
3 changed files with 51 additions and 15 deletions
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47
net/rfkill/rfkill-input.c
View File

@ -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;

1
net/rfkill/rfkill-input.h
View File

@ -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 */

18
net/rfkill/rfkill.c
View File

@ -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.