[PATCH 3/3] thunderbolt: Allow clearing the key

["Bernat, Yehezkel" <yehezkel.bernat@intel.com>]

If secure authentication of a devices fails, either because the device
already has another key uploaded, or there is some other error sending
challenge to the device, and the user only wants to approve the device
just once (without a new key being uploaded to the device) the current
implementation does not allow this because the key cannot be cleared
once set even if we allow it to be changed.

Make this scenario possible and allow clearing the key by writing
empty string to the key sysfs file.

Signed-off-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
---
 Documentation/ABI/testing/sysfs-bus-thunderbolt |  2 ++
 drivers/thunderbolt/switch.c                    | 15 +++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt
index 2a98149..392bef5 100644
--- a/Documentation/ABI/testing/sysfs-bus-thunderbolt
+++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt
@@ -45,6 +45,8 @@ Contact:	thunderbolt-software@lists.01.org
 Description:	When a devices supports Thunderbolt secure connect it will
 		have this attribute. Writing 32 byte hex string changes
 		authorization to use the secure connection method instead.
+		Writing an empty string clears the key and regular connection
+		method can be used again.
 
 What:		/sys/bus/thunderbolt/devices/.../device
 Date:		Sep 2017
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 8510abc..53f40c5 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -807,8 +807,11 @@ static ssize_t key_store(struct device *dev, struct device_attribute *attr,
 	struct tb_switch *sw = tb_to_switch(dev);
 	u8 key[TB_SWITCH_KEY_SIZE];
 	ssize_t ret = count;
+	bool clear = false;
 
-	if (hex2bin(key, buf, sizeof(key)))
+	if (!strcmp(buf, "\n"))
+		clear = true;
+	else if (hex2bin(key, buf, sizeof(key)))
 		return -EINVAL;
 
 	if (mutex_lock_interruptible(&switch_lock))
@@ -818,9 +821,13 @@ static ssize_t key_store(struct device *dev, struct device_attribute *attr,
 		ret = -EBUSY;
 	} else {
 		kfree(sw->key);
-		sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
-		if (!sw->key)
-			ret = -ENOMEM;
+		if (clear) {
+			sw->key = NULL;
+		} else {
+			sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
+			if (!sw->key)
+				ret = -ENOMEM;
+		}
 	}
 
 	mutex_unlock(&switch_lock);
-- 
2.7.4