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Commit 757186eb authored by Todd Kennedy's avatar Todd Kennedy
Browse files

Add native bindings for getNamesForUids 

A new API [getNamesForUids] was recently added to the PackageManager
and this API needs to be accessible to native code. However, there
were two constraints:
1) Instead of hand-rolling the binder, we wanted to auto generate
the bindings directly from the AIDL compiler.
2) We didn't want to expose/annotate all 180+ PackageManager APIs
when only a single API is needed.
So, we chose to create a parallel API that can be used explicitly
for native bindings without exposing the entirety of the
PackageManager.

Bug: 62805090
Test: Manual
Test: Create a native application that calls into the new service
Test: See the call works and data and returned
Change-Id: Icdcb5c825fdc08d029b0eaed5c5be49cce40c9d8
parent ac8661be

libs/binder/Android.bp

+5 −0
Original line number Diff line number Diff line
@@ -66,8 +66,13 @@ cc_library { 
        "TextOutput.cpp",

        "IpPrefix.cpp",

        "Value.cpp",

        "aidl/android/content/pm/IPackageManagerNative.aidl",

    ],



    aidl: {

        export_aidl_headers: true,

    },



    cflags: [

        "-Wall",

        "-Wextra",

libs/binder/aidl/android/content/pm/IPackageManagerNative.aidl

0 → 100644
+41 −0
Original line number Diff line number Diff line 
/*

**

** Copyright 2017, The Android Open Source Project

**

** Licensed under the Apache License, Version 2.0 (the "License");

** you may not use this file except in compliance with the License.

** You may obtain a copy of the License at

**

**     http://www.apache.org/licenses/LICENSE-2.0

**

** Unless required by applicable law or agreed to in writing, software

** distributed under the License is distributed on an "AS IS" BASIS,

** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

** See the License for the specific language governing permissions and

** limitations under the License.

*/



package android.content.pm;



/**

 * Parallel implementation of certain {@link PackageManager} APIs that need to

 * be exposed to native code.

 * <p>These APIs are a parallel definition to the APIs in PackageManager, so,

 * they can technically diverge. However, it's good practice to keep these

 * APIs in sync with each other.

 * <p>Because these APIs are exposed to native code, it's possible they will

 * be exposed to privileged components [such as UID 0]. Care should be taken

 * to avoid exposing potential security holes for methods where permission

 * checks are bypassed based upon UID alone.

 *

 * @hide

 */

interface IPackageManagerNative {

    /**

     * Returns a set of names for the given UIDs.

     * IMPORTANT: Unlike the Java version of this API, unknown UIDs are

     * not represented by 'null's. Instead, they are represented by empty

     * strings.

     */

    @utf8InCpp String[] getNamesForUids(in int[] uids);

}