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Commit 58270527 authored by Makoto Onuki's avatar Makoto Onuki
Browse files

Only allow the system server to connect to sync adapters 

Bug: 203229608
Test: Manual test with changing the check logic + debug log
Change-Id: If18009f61360564d02dcda9b1e5fa15685e3250f
parent eef327f5

core/java/android/content/AbstractThreadedSyncAdapter.java

+20 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ import static com.android.internal.util.function.pooled.PooledLambda.obtainMessa 
import android.accounts.Account;

import android.annotation.MainThread;

import android.annotation.NonNull;

import android.os.Binder;

import android.os.Build;

import android.os.Bundle;

import android.os.Handler;
@@ -171,8 +172,20 @@ public abstract class AbstractThreadedSyncAdapter { 
    }



    private class ISyncAdapterImpl extends ISyncAdapter.Stub {

        private boolean isCallerSystem() {

            final long callingUid = Binder.getCallingUid();

            if (callingUid != Process.SYSTEM_UID) {

                android.util.EventLog.writeEvent(0x534e4554, "203229608", -1, "");

                return false;

            }

            return true;

        }



        @Override

        public void onUnsyncableAccount(ISyncAdapterUnsyncableAccountCallback cb) {

            if (!isCallerSystem()) {

                return;

            }

            Handler.getMain().sendMessage(obtainMessage(

                    AbstractThreadedSyncAdapter::handleOnUnsyncableAccount,

                    AbstractThreadedSyncAdapter.this, cb));
@@ -181,12 +194,16 @@ public abstract class AbstractThreadedSyncAdapter { 
        @Override

        public void startSync(ISyncContext syncContext, String authority, Account account,

                Bundle extras) {

            if (!isCallerSystem()) {

                return;

            }

            if (ENABLE_LOG) {

                if (extras != null) {

                    extras.size(); // Unparcel so its toString() will show the contents.

                }

                Log.d(TAG, "startSync() start " + authority + " " + account + " " + extras);

            }



            try {

                final SyncContext syncContextClient = new SyncContext(syncContext);
@@ -242,6 +259,9 @@ public abstract class AbstractThreadedSyncAdapter { 


        @Override

        public void cancelSync(ISyncContext syncContext) {

            if (!isCallerSystem()) {

                return;

            }

            try {

                // synchronize to make sure that mSyncThreads doesn't change between when we

                // check it and when we use it