Merge "Parcel: markForBinder"

core/java/android/os/Parcel.java

@@ -282,6 +282,8 @@ public final class Parcel {
 
     @CriticalNative
     private static native void nativeMarkSensitive(long nativePtr);
+    @FastNative
+    private static native void nativeMarkForBinder(long nativePtr, IBinder binder);
     @CriticalNative
     private static native int nativeDataSize(long nativePtr);
     @CriticalNative
@@ -498,16 +500,40 @@ public final class Parcel {
 
     /**
      * Parcel data should be zero'd before realloc'd or deleted.
+     *
+     * Note: currently this feature requires multiple things to work in concert:
+     * - markSensitive must be called on every relative Parcel
+     * - FLAG_CLEAR_BUF must be passed into the kernel
+     * This requires having code which does the right thing in every method and in every backend
+     * of AIDL. Rather than exposing this API, it should be replaced with a single API on
+     * IBinder objects which can be called once, and the information should be fed into the
+     * Parcel using markForBinder APIs. In terms of code size and number of API calls, this is
+     * much more extensible.
+     *
      * @hide
      */
     public final void markSensitive() {
         nativeMarkSensitive(mNativePtr);
     }
 
+    /**
+     * Associate this parcel with a binder object. This marks the parcel as being prepared for a
+     * transaction on this specific binder object. Based on this, the format of the wire binder
+     * protocol may change. This should be called before any data is written to the parcel. If this
+     * is called multiple times, this will only be marked for the last binder. For future
+     * compatibility, it is recommended to call this on all parcels which are being sent over
+     * binder.
+     *
+     * @hide
+     */
+    public void markForBinder(@NonNull IBinder binder) {
+        nativeMarkForBinder(mNativePtr, binder);
+    }
+
     /**
      * Returns the total amount of data contained in the parcel.
      */
-    public final int dataSize() {
+    public int dataSize() {
         return nativeDataSize(mNativePtr);
     }
 

core/jni/android_os_Parcel.cpp

@@ -98,6 +98,15 @@ static void android_os_Parcel_markSensitive(jlong nativePtr)
     }
 }
 
+static void android_os_Parcel_markForBinder(JNIEnv* env, jclass clazz, jlong nativePtr,
+                                            jobject binder)
+{
+    Parcel* parcel = reinterpret_cast<Parcel*>(nativePtr);
+    if (parcel) {
+        parcel->markForBinder(ibinderForJavaObject(env, binder));
+    }
+}
+
 static jint android_os_Parcel_dataSize(jlong nativePtr)
 {
     Parcel* parcel = reinterpret_cast<Parcel*>(nativePtr);
@@ -766,7 +775,9 @@ static jboolean android_os_Parcel_replaceCallingWorkSourceUid(jlong nativePtr, j
 
 static const JNINativeMethod gParcelMethods[] = {
     // @CriticalNative
-    {"nativeMarkSensitive",             "(J)V", (void*)android_os_Parcel_markSensitive},
+    {"nativeMarkSensitive",       "(J)V", (void*)android_os_Parcel_markSensitive},
+    // @FastNative
+    {"nativeMarkForBinder",       "(JLandroid/os/IBinder;)V", (void*)android_os_Parcel_markForBinder},
     // @CriticalNative
     {"nativeDataSize",            "(J)I", (void*)android_os_Parcel_dataSize},
     // @CriticalNative