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Commit bf6bbc60 authored by Steven Moreland's avatar Steven Moreland
Browse files

Binder: allow stability downgrade 

For instance, use a VINTF interface inside the system image without
adding it to the VINTF manifest (e.g. for testing, in this case, the
interface can't be used between system and vendor).

Bug: 183154648
Test: N/A
Change-Id: I9ceb5d96e6a245b9509d9c60828aa3736056909d
parent be1b1d55

core/java/android/os/Binder.java

+10 −0
Original line number Diff line number Diff line
@@ -542,6 +542,16 @@ public class Binder implements IBinder { 
    @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)

    public final native void markVintfStability();



    /**

     * Use a VINTF-stability binder w/o VINTF requirements. Should be called

     * on a binder before it is sent out of process.

     *

     * This must be called before the object is sent to another process.

     *

     * @hide

     */

    public final native void forceDowngradeToSystemStability();



    /**

     * Flush any Binder commands pending in the current thread to the kernel

     * driver.  This can be

core/jni/android_util_Binder.cpp

+13 −0
Original line number Diff line number Diff line
@@ -486,9 +486,15 @@ public: 
    }



    void markVintf() {

        AutoMutex _l(mLock);

        mVintf = true;

    }



    void forceDowngradeToSystemStability() {

        AutoMutex _l(mLock);

        mVintf = false;

    }



    sp<IBinder> getExtension() {

        AutoMutex _l(mLock);

        sp<JavaBBinder> b = mBinder.promote();
@@ -1013,6 +1019,12 @@ static void android_os_Binder_markVintfStability(JNIEnv* env, jobject clazz) { 
    jbh->markVintf();

}



static void android_os_Binder_forceDowngradeToSystemStability(JNIEnv* env, jobject clazz) {

    JavaBBinderHolder* jbh =

        (JavaBBinderHolder*) env->GetLongField(clazz, gBinderOffsets.mObject);

    jbh->forceDowngradeToSystemStability();

}



static void android_os_Binder_flushPendingCommands(JNIEnv* env, jobject clazz)

{

    IPCThreadState::self()->flushCommands();
@@ -1076,6 +1088,7 @@ static const JNINativeMethod gBinderMethods[] = { 
    { "clearCallingWorkSource", "()J", (void*)android_os_Binder_clearCallingWorkSource },

    { "restoreCallingWorkSource", "(J)V", (void*)android_os_Binder_restoreCallingWorkSource },

    { "markVintfStability", "()V", (void*)android_os_Binder_markVintfStability},

    { "forceDowngradeToSystemStability", "()V", (void*)android_os_Binder_forceDowngradeToSystemStability},

    { "flushPendingCommands", "()V", (void*)android_os_Binder_flushPendingCommands },

    { "getNativeBBinderHolder", "()J", (void*)android_os_Binder_getNativeBBinderHolder },

    { "getNativeFinalizer", "()J", (void*)android_os_Binder_getNativeFinalizer },