linux-kernel - [PATCH 1/9 RESEND] rtc: rtc-hid-sensor-time: allow full years (16bit) in HID reports

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1371228732-5749-2-git-send-email-holler@ahsoftware.de>
Date:	Fri, 14 Jun 2013 18:52:04 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <john.stultz@...aro.org>,
	rtc-linux@...glegroups.com, Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexander Holler <holler@...oftware.de>
Subject: [PATCH 1/9 RESEND] rtc: rtc-hid-sensor-time: allow full years (16bit) in HID reports

The draft for HID-sensors (HUTRR39) currently doesn't define the range
for the attribute year. Asking one of the authors revealed that full years
(e.g. 2013 instead of just 13) were meant.

So we now allow both, 8 bit and 16 bit values for the attribute year and
assuming full years when the value is 16 bits wide.

We will still support 8 bit values until the specification gets final
(and maybe defines a way to set the time too).

Signed-off-by: Alexander Holler <holler@...oftware.de>
---
 drivers/rtc/rtc-hid-sensor-time.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/rtc/rtc-hid-sensor-time.c b/drivers/rtc/rtc-hid-sensor-time.c
index 6302450..b8c1b10 100644
--- a/drivers/rtc/rtc-hid-sensor-time.c
+++ b/drivers/rtc/rtc-hid-sensor-time.c
@@ -85,10 +85,13 @@ static int hid_time_capture_sample(struct hid_sensor_hub_device *hsdev,
 
 	switch (usage_id) {
 	case HID_USAGE_SENSOR_TIME_YEAR:
-		time_buf->tm_year = *(u8 *)raw_data;
-		if (time_buf->tm_year < 70)
-			/* assume we are in 1970...2069 */
-			time_buf->tm_year += 100;
+		if (raw_len == 1) {
+			time_buf->tm_year = *(u8 *)raw_data;
+			if (time_buf->tm_year < 70)
+				/* assume we are in 1970...2069 */
+				time_buf->tm_year += 100;
+		} else
+			time_buf->tm_year = *(u16 *)raw_data-1900;
 		break;
 	case HID_USAGE_SENSOR_TIME_MONTH:
 		/* sensor sending the month as 1-12, we need 0-11 */
@@ -151,11 +154,27 @@ static int hid_time_parse_report(struct platform_device *pdev,
 			return -EINVAL;
 		}
 		if (time_state->info[i].size != 1) {
-			dev_err(&pdev->dev,
-				"attribute '%s' not 8 bits wide!\n",
+			/*
+			 * The draft for HID-sensors (HUTRR39) currently
+			 * doesn't define the range for the year attribute.
+			 * Therefor we support both 8 bit (0-99) and 16 bit
+			 * (full) as size for the year.
+			 */
+			if (time_state->info[i].attrib_id !=
+				HID_USAGE_SENSOR_TIME_YEAR) {
+				dev_err(&pdev->dev,
+					"attribute '%s' not 8 bits wide!\n",
 				hid_time_attrib_name(
 					time_state->info[i].attrib_id));
-			return -EINVAL;
+				return -EINVAL;
+			}
+			if (time_state->info[i].size != 2) {
+				dev_err(&pdev->dev,
+					"attribute '%s' not 8 or 16 bits wide!\n",
+				hid_time_attrib_name(
+					time_state->info[i].attrib_id));
+				return -EINVAL;
+			}
 		}
 		if (time_state->info[i].units !=
 				HID_USAGE_SENSOR_UNITS_NOT_SPECIFIED &&
-- 
1.8.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/