1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <binder/IPCThreadState.h>
18 #include <gui/LayerStatePermissions.h>
19 #include <private/android_filesystem_config.h>
20 #ifndef __ANDROID_VNDK__
21 #include <binder/PermissionCache.h>
22 #endif // __ANDROID_VNDK__
23 #include <gui/LayerState.h>
24
25 namespace android {
26 std::unordered_map<std::string, int> LayerStatePermissions::mPermissionMap = {
27 // If caller has ACCESS_SURFACE_FLINGER, they automatically get ROTATE_SURFACE_FLINGER
28 // permission, as well
29 {"android.permission.ACCESS_SURFACE_FLINGER",
30 layer_state_t::Permission::ACCESS_SURFACE_FLINGER |
31 layer_state_t::Permission::ROTATE_SURFACE_FLINGER},
32 {"android.permission.ROTATE_SURFACE_FLINGER",
33 layer_state_t::Permission::ROTATE_SURFACE_FLINGER},
34 {"android.permission.INTERNAL_SYSTEM_WINDOW",
35 layer_state_t::Permission::INTERNAL_SYSTEM_WINDOW},
36 };
37
callingThreadHasPermission(const std::string & permission,int pid,int uid)38 static bool callingThreadHasPermission(const std::string& permission __attribute__((unused)),
39 int pid __attribute__((unused)),
40 int uid __attribute__((unused))) {
41 #ifndef __ANDROID_VNDK__
42 return uid == AID_GRAPHICS || uid == AID_SYSTEM ||
43 PermissionCache::checkPermission(String16(permission.c_str()), pid, uid);
44 #endif // __ANDROID_VNDK__
45 return false;
46 }
47
getTransactionPermissions(int pid,int uid)48 uint32_t LayerStatePermissions::getTransactionPermissions(int pid, int uid) {
49 uint32_t permissions = 0;
50 for (auto [permissionName, permissionVal] : mPermissionMap) {
51 if (callingThreadHasPermission(permissionName, pid, uid)) {
52 permissions |= permissionVal;
53 }
54 }
55
56 return permissions;
57 }
58 } // namespace android
59