diff options
author | Stephen Chandler Paul <cpaul@redhat.com> | 2015-07-15 10:20:17 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-07-16 10:30:55 -0700 |
commit | e1443d2849b146be4ed8d4ef89ae7e215aafaa5b (patch) | |
tree | 874ddd2d1c23d9bf46d2d751fe7c5764a3d18f4e /drivers/input/serio/i8042.c | |
parent | 339d6b88e872f8369495a7224916a4d1d8376ca3 (diff) | |
download | linux-e1443d2849b146be4ed8d4ef89ae7e215aafaa5b.tar.bz2 |
Input: i8042 - add unmask_kbd_data option
A big problem with the current i8042 debugging option is that it outputs
data going to and from the keyboard by default. As a result, many dmesg
logs uploaded by users will unintentionally contain sensitive information
such as their password, as such it's probably a good idea not to output
data coming from the keyboard unless specifically enabled by the user.
Signed-off-by: Stephen Chandler Paul <cpaul@redhat.com>
Reviewed-by: Andreas Mohr <andim2@users.sf.net>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/serio/i8042.c')
-rw-r--r-- | drivers/input/serio/i8042.c | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c index cb5ece77fd7d..c9c98f0ab284 100644 --- a/drivers/input/serio/i8042.c +++ b/drivers/input/serio/i8042.c @@ -88,6 +88,10 @@ MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings"); static bool i8042_debug; module_param_named(debug, i8042_debug, bool, 0600); MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off"); + +static bool i8042_unmask_kbd_data; +module_param_named(unmask_kbd_data, i8042_unmask_kbd_data, bool, 0600); +MODULE_PARM_DESC(unmask_kbd_data, "Unconditional enable (may reveal sensitive data) of normally sanitize-filtered kbd data traffic debug log [pre-condition: i8042.debug=1 enabled]"); #endif static bool i8042_bypass_aux_irq_test; @@ -116,6 +120,7 @@ struct i8042_port { struct serio *serio; int irq; bool exists; + bool driver_bound; signed char mux; }; @@ -133,6 +138,7 @@ static bool i8042_kbd_irq_registered; static bool i8042_aux_irq_registered; static unsigned char i8042_suppress_kbd_ack; static struct platform_device *i8042_platform_device; +static struct notifier_block i8042_kbd_bind_notifier_block; static irqreturn_t i8042_interrupt(int irq, void *dev_id); static bool (*i8042_platform_filter)(unsigned char data, unsigned char str, @@ -528,10 +534,10 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id) port = &i8042_ports[port_no]; serio = port->exists ? port->serio : NULL; - dbg("%02x <- i8042 (interrupt, %d, %d%s%s)\n", - data, port_no, irq, - dfl & SERIO_PARITY ? ", bad parity" : "", - dfl & SERIO_TIMEOUT ? ", timeout" : ""); + filter_dbg(port->driver_bound, data, "<- i8042 (interrupt, %d, %d%s%s)\n", + port_no, irq, + dfl & SERIO_PARITY ? ", bad parity" : "", + dfl & SERIO_TIMEOUT ? ", timeout" : ""); filtered = i8042_filter(data, str, serio); @@ -1438,6 +1444,29 @@ static int __init i8042_setup_kbd(void) return error; } +static int i8042_kbd_bind_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct serio *serio = to_serio_port(dev); + struct i8042_port *port = serio->port_data; + + if (serio != i8042_ports[I8042_KBD_PORT_NO].serio) + return 0; + + switch (action) { + case BUS_NOTIFY_BOUND_DRIVER: + port->driver_bound = true; + break; + + case BUS_NOTIFY_UNBIND_DRIVER: + port->driver_bound = false; + break; + } + + return 0; +} + static int __init i8042_probe(struct platform_device *dev) { int error; @@ -1507,6 +1536,10 @@ static struct platform_driver i8042_driver = { .shutdown = i8042_shutdown, }; +static struct notifier_block i8042_kbd_bind_notifier_block = { + .notifier_call = i8042_kbd_bind_notifier, +}; + static int __init i8042_init(void) { struct platform_device *pdev; @@ -1528,6 +1561,7 @@ static int __init i8042_init(void) goto err_platform_exit; } + bus_register_notifier(&serio_bus, &i8042_kbd_bind_notifier_block); panic_blink = i8042_panic_blink; return 0; @@ -1543,6 +1577,7 @@ static void __exit i8042_exit(void) platform_driver_unregister(&i8042_driver); i8042_platform_exit(); + bus_unregister_notifier(&serio_bus, &i8042_kbd_bind_notifier_block); panic_blink = NULL; } |