Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752168AbbFYTZo (ORCPT ); Thu, 25 Jun 2015 15:25:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52086 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751535AbbFYTZf (ORCPT ); Thu, 25 Jun 2015 15:25:35 -0400 From: cpaul@redhat.com To: Benjamin Tissoires , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, Dmitry Torokhov , Hans de Goede Subject: [PATCH] i8042: Add debug_kbd option Date: Thu, 25 Jun 2015 15:25:10 -0400 Message-Id: <1435260310-10074-1-git-send-email-cpaul@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3381 Lines: 84 From: Stephen Chandler Paul 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 Reviewed-by: Benjamin Tissoires --- Documentation/kernel-parameters.txt | 7 +++++++ drivers/input/serio/i8042.c | 25 +++++++++++++++++++++---- 2 files changed, 28 insertions(+), 4 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index ae44749..9e00234 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1304,6 +1304,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. , i8042.debug [HW] Toggle i8042 debug mode + i8042.debug_kbd [HW] Enable printing of interrupt data from the KBD port + As a side effect, this option will mask some of the + interrupts sent back from the keyboard during the + initialization of the KBD port on the i8042, if you + need to see this, you will need to enable this + option. + (disabled by default) i8042.direct [HW] Put keyboard port into non-translated mode i8042.dumbkbd [HW] Pretend that controller can only read data from keyboard and cannot control its state diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c index cb5ece7..084fc05 100644 --- a/drivers/input/serio/i8042.c +++ b/drivers/input/serio/i8042.c @@ -88,6 +88,23 @@ 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_debug_kbd; +module_param_named(debug_kbd, i8042_debug_kbd, bool, 0600); +MODULE_PARM_DESC(i8042_kbd, "Turn i8042 kbd debugging output on or off"); + +#define str_dbg(str, data, format, args...) \ + do { \ + if (!i8042_debug) \ + break; \ + \ + if (str & I8042_STR_AUXDATA || i8042_debug_kbd) \ + dbg("%02x " format, data, ##args); \ + else \ + dbg("** " format, ##args); \ + } while (0) +#else +#define str_dbg(str, data, format, args...) do { } while (0) #endif static bool i8042_bypass_aux_irq_test; @@ -528,10 +545,10 @@ 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" : ""); + str_dbg(str, 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); -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/