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    Subject[PATCH 14/15] rfkill: do not allow userspace to override ALL RADIOS OFF
    Date
    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>
    Cc: Ivo van Doorn <IvDoorn@gmail.com>
    Cc: Dmitry Torokhov <dtor@mail.ru>
    ---
    net/rfkill/rfkill-input.c | 29 ++++++++++++++---------------
    net/rfkill/rfkill-input.h | 1 +
    net/rfkill/rfkill.c | 18 ++++++++++++++++++
    3 files changed, 33 insertions(+), 15 deletions(-)

    diff --git a/net/rfkill/rfkill-input.c b/net/rfkill/rfkill-input.c
    index 29c13d3..0fadeed 100644
    --- a/net/rfkill/rfkill-input.c
    +++ b/net/rfkill/rfkill-input.c
    @@ -127,21 +127,20 @@ 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_epo();
    break;
    default:
    break;
    diff --git a/net/rfkill/rfkill-input.h b/net/rfkill/rfkill-input.h
    index 4dae500..f63d050 100644
    --- a/net/rfkill/rfkill-input.h
    +++ b/net/rfkill/rfkill-input.h
    @@ -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 */
    diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
    index ba25bde..fdde692 100644
    --- a/net/rfkill/rfkill.c
    +++ b/net/rfkill/rfkill.c
    @@ -182,6 +182,24 @@ 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.
    * @state: the current radio state the class should be forced to.
    --
    1.5.5.1


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