diff --git a/libs/gui/Sensor.cpp b/libs/gui/Sensor.cpp
index da6b0f9..6f1a3f2 100644
--- a/libs/gui/Sensor.cpp
+++ b/libs/gui/Sensor.cpp
@@ -48,14 +48,90 @@
     mResolution = hwSensor->resolution;
     mPower = hwSensor->power;
     mMinDelay = hwSensor->minDelay;
+
     // Set fifo event count zero for older devices which do not support batching. Fused
     // sensors also have their fifo counts set to zero.
     if (halVersion >= SENSORS_DEVICE_API_VERSION_1_1) {
         mFifoReservedEventCount = hwSensor->fifoReservedEventCount;
         mFifoMaxEventCount = hwSensor->fifoMaxEventCount;
-    } else {
-        mFifoReservedEventCount = 0;
-        mFifoMaxEventCount = 0;
+    }
+
+    // Ensure existing sensors have correct string type and required
+    // permissions.
+    switch (mType) {
+    case SENSOR_TYPE_ACCELEROMETER:
+        mStringType = SENSOR_STRING_TYPE_ACCELEROMETER;
+        break;
+    case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+        mStringType = SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE;
+        break;
+    case SENSOR_TYPE_GAME_ROTATION_VECTOR:
+        mStringType = SENSOR_STRING_TYPE_GAME_ROTATION_VECTOR;
+        break;
+    case SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR:
+        mStringType = SENSOR_STRING_TYPE_GEOMAGNETIC_ROTATION_VECTOR;
+        break;
+    case SENSOR_TYPE_GRAVITY:
+        mStringType = SENSOR_STRING_TYPE_GRAVITY;
+        break;
+    case SENSOR_TYPE_GYROSCOPE:
+        mStringType = SENSOR_STRING_TYPE_GYROSCOPE;
+        break;
+    case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+        mStringType = SENSOR_STRING_TYPE_GYROSCOPE_UNCALIBRATED;
+        break;
+    case SENSOR_TYPE_HEART_RATE:
+        mStringType = SENSOR_STRING_TYPE_HEART_RATE;
+        mRequiredPermission = SENSOR_PERMISSION_BODY_SENSORS;
+        break;
+    case SENSOR_TYPE_LIGHT:
+        mStringType = SENSOR_STRING_TYPE_LIGHT;
+        break;
+    case SENSOR_TYPE_LINEAR_ACCELERATION:
+        mStringType = SENSOR_STRING_TYPE_LINEAR_ACCELERATION;
+        break;
+    case SENSOR_TYPE_MAGNETIC_FIELD:
+        mStringType = SENSOR_STRING_TYPE_MAGNETIC_FIELD;
+        break;
+    case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
+        mStringType = SENSOR_STRING_TYPE_MAGNETIC_FIELD_UNCALIBRATED;
+        break;
+    case SENSOR_TYPE_ORIENTATION:
+        mStringType = SENSOR_STRING_TYPE_ORIENTATION;
+        break;
+    case SENSOR_TYPE_PRESSURE:
+        mStringType = SENSOR_STRING_TYPE_PRESSURE;
+        break;
+    case SENSOR_TYPE_PROXIMITY:
+        mStringType = SENSOR_STRING_TYPE_PROXIMITY;
+        break;
+    case SENSOR_TYPE_RELATIVE_HUMIDITY:
+        mStringType = SENSOR_STRING_TYPE_RELATIVE_HUMIDITY;
+        break;
+    case SENSOR_TYPE_ROTATION_VECTOR:
+        mStringType = SENSOR_STRING_TYPE_ROTATION_VECTOR;
+        break;
+    case SENSOR_TYPE_SIGNIFICANT_MOTION:
+        mStringType = SENSOR_STRING_TYPE_SIGNIFICANT_MOTION;
+        break;
+    case SENSOR_TYPE_STEP_COUNTER:
+        mStringType = SENSOR_STRING_TYPE_STEP_COUNTER;
+        break;
+    case SENSOR_TYPE_STEP_DETECTOR:
+        mStringType = SENSOR_STRING_TYPE_STEP_DETECTOR;
+        break;
+    case SENSOR_TYPE_TEMPERATURE:
+        mStringType = SENSOR_STRING_TYPE_TEMPERATURE;
+        break;
+    default:
+        // Only pipe the stringType and requiredPermission for custom sensors.
+        if (halVersion >= SENSORS_DEVICE_API_VERSION_1_2 && hwSensor->stringType) {
+            mStringType = hwSensor->stringType;
+        }
+        if (halVersion >= SENSORS_DEVICE_API_VERSION_1_2 && hwSensor->requiredPermission) {
+            mRequiredPermission = hwSensor->requiredPermission;
+        }
+        break;
     }
 }
 
@@ -115,6 +191,14 @@
     return mFifoMaxEventCount;
 }
 
+const String8& Sensor::getStringType() const {
+    return mStringType;
+}
+
+const String8& Sensor::getRequiredPermission() const {
+    return mRequiredPermission;
+}
+
 size_t Sensor::getFlattenedSize() const
 {
     size_t fixedSize =
@@ -123,8 +207,10 @@
             sizeof(int32_t) * 3;
 
     size_t variableSize =
-            sizeof(int32_t) + FlattenableUtils::align<4>(mName.length()) +
-            sizeof(int32_t) + FlattenableUtils::align<4>(mVendor.length());
+            sizeof(uint32_t) + FlattenableUtils::align<4>(mName.length()) +
+            sizeof(uint32_t) + FlattenableUtils::align<4>(mVendor.length()) +
+            sizeof(uint32_t) + FlattenableUtils::align<4>(mStringType.length()) +
+            sizeof(uint32_t) + FlattenableUtils::align<4>(mRequiredPermission.length());
 
     return fixedSize + variableSize;
 }
@@ -134,14 +220,8 @@
         return NO_MEMORY;
     }
 
-    FlattenableUtils::write(buffer, size, mName.length());
-    memcpy(static_cast<char*>(buffer), mName.string(), mName.length());
-    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(mName.length()));
-
-    FlattenableUtils::write(buffer, size, mVendor.length());
-    memcpy(static_cast<char*>(buffer), mVendor.string(), mVendor.length());
-    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(mVendor.length()));
-
+    flattenString8(buffer, size, mName);
+    flattenString8(buffer, size, mVendor);
     FlattenableUtils::write(buffer, size, mVersion);
     FlattenableUtils::write(buffer, size, mHandle);
     FlattenableUtils::write(buffer, size, mType);
@@ -152,38 +232,23 @@
     FlattenableUtils::write(buffer, size, mMinDelay);
     FlattenableUtils::write(buffer, size, mFifoReservedEventCount);
     FlattenableUtils::write(buffer, size, mFifoMaxEventCount);
+    flattenString8(buffer, size, mStringType);
+    flattenString8(buffer, size, mRequiredPermission);
     return NO_ERROR;
 }
 
 status_t Sensor::unflatten(void const* buffer, size_t size) {
-    size_t len;
-
-    if (size < sizeof(size_t)) {
+    if (!unflattenString8(buffer, size, mName)) {
         return NO_MEMORY;
     }
-    FlattenableUtils::read(buffer, size, len);
-    if (size < len) {
+    if (!unflattenString8(buffer, size, mVendor)) {
         return NO_MEMORY;
     }
-    mName.setTo(static_cast<char const*>(buffer), len);
-    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
-
-
-    if (size < sizeof(size_t)) {
-        return NO_MEMORY;
-    }
-    FlattenableUtils::read(buffer, size, len);
-    if (size < len) {
-        return NO_MEMORY;
-    }
-    mVendor.setTo(static_cast<char const*>(buffer), len);
-    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
 
     size_t fixedSize =
             sizeof(int32_t) * 3 +
             sizeof(float) * 4 +
             sizeof(int32_t) * 3;
-
     if (size < fixedSize) {
         return NO_MEMORY;
     }
@@ -198,8 +263,37 @@
     FlattenableUtils::read(buffer, size, mMinDelay);
     FlattenableUtils::read(buffer, size, mFifoReservedEventCount);
     FlattenableUtils::read(buffer, size, mFifoMaxEventCount);
+
+    if (!unflattenString8(buffer, size, mStringType)) {
+        return NO_MEMORY;
+    }
+    if (!unflattenString8(buffer, size, mRequiredPermission)) {
+        return NO_MEMORY;
+    }
     return NO_ERROR;
 }
 
+void Sensor::flattenString8(void*& buffer, size_t& size,
+        const String8& string8) {
+    uint32_t len = string8.length();
+    FlattenableUtils::write(buffer, size, len);
+    memcpy(static_cast<char*>(buffer), string8.string(), len);
+    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
+}
+
+bool Sensor::unflattenString8(void const*& buffer, size_t& size, String8& outputString8) {
+    uint32_t len;
+    if (size < sizeof(len)) {
+        return false;
+    }
+    FlattenableUtils::read(buffer, size, len);
+    if (size < len) {
+        return false;
+    }
+    outputString8.setTo(static_cast<char const*>(buffer), len);
+    FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
+    return true;
+}
+
 // ----------------------------------------------------------------------------
 }; // namespace android