1 /*
2 * Copyright (C) 2020 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 "linker_translate_path.h"
18
19 #include <string>
20
21 #include <android/api-level.h>
22
23 #include "linker.h"
24
25 // Handle dlopen by full path.
26 //
27 // 1. Translate original path to native_bridge path.
28 //
29 // Native bridge libraries reside in $LIB/$ABI subdirectory. For example:
30 // /system/lib/liblog.so -> /system/lib/arm/liblog.so
31 //
32 // Native bridge libraries do not use apex. For example:
33 // /apex/com.android.i18n/lib/libicuuc.so -> /system/lib/arm/libicuuc.so
34 //
35 // 2. Repeat linker workaround to open apex libraries by system path (see http://b/121248172).
36 //
37 // For older target SDK versions, linker allows to open apex libraries by system path, so it does:
38 // /system/lib/libicuuc.so -> /apex/com.android.art/lib/libicuuc.so
39 //
40 // Adding native bridge path translation, we get:
41 // /system/lib/libicuuc.so -> /apex/com.android.art/lib/libicuuc.so -> /system/lib/arm/libicuuc.so
42
43 #if defined(__arm__)
44 #define SYSTEM_LIB(name) \
45 { "/system/lib/" name, "/system/lib/arm/" name }
46 #define APEX_LIB(apex, name) \
47 { "/apex/" apex "/lib/" name, "/system/lib/arm/" name }
48 #elif defined(__aarch64__)
49 #define SYSTEM_LIB(name) \
50 { "/system/lib64/" name, "/system/lib64/arm64/" name }
51 #define APEX_LIB(apex, name) \
52 { "/apex/" apex "/lib64/" name, "/system/lib64/arm64/" name }
53 #else
54 #error "Unknown guest arch"
55 #endif
56
57 /**
58 * Translate /system path or /apex path to native_bridge path
59 * Function name is misleading, as it overrides the corresponding function in original linker.
60 *
61 * param out_name pointing to native_bridge path
62 * return true if translation is needed
63 */
translateSystemPathToApexPath(const char * name,std::string * out_name)64 bool translateSystemPathToApexPath(const char* name, std::string* out_name) {
65 static constexpr const char* kPathTranslation[][2] = {
66 // Libraries accessible by system path.
67 SYSTEM_LIB("libEGL.so"),
68 SYSTEM_LIB("libGLESv1_CM.so"),
69 SYSTEM_LIB("libGLESv2.so"),
70 SYSTEM_LIB("libGLESv3.so"),
71 SYSTEM_LIB("libOpenMAXAL.so"),
72 SYSTEM_LIB("libOpenSLES.so"),
73 SYSTEM_LIB("libRS.so"),
74 SYSTEM_LIB("libaaudio.so"),
75 SYSTEM_LIB("libamidi.so"),
76 SYSTEM_LIB("libandroid.so"),
77 SYSTEM_LIB("libbinder_ndk.so"),
78 SYSTEM_LIB("libc.so"),
79 SYSTEM_LIB("libcamera2ndk.so"),
80 SYSTEM_LIB("libdl.so"),
81 SYSTEM_LIB("libjnigraphics.so"),
82 SYSTEM_LIB("liblog.so"),
83 SYSTEM_LIB("libm.so"),
84 SYSTEM_LIB("libmediandk.so"),
85 SYSTEM_LIB("libnativewindow.so"),
86 SYSTEM_LIB("libstdc++.so"),
87 SYSTEM_LIB("libsync.so"),
88 SYSTEM_LIB("libvulkan.so"),
89 SYSTEM_LIB("libwebviewchromium_plat_support.so"),
90 SYSTEM_LIB("libz.so"),
91 // Apex/system after R.
92 APEX_LIB("com.android.i18n", "libandroidicu.so"),
93 APEX_LIB("com.android.i18n", "libicu.so"),
94 APEX_LIB("com.android.i18n", "libicui18n.so"),
95 APEX_LIB("com.android.i18n", "libicuuc.so"),
96 APEX_LIB("com.android.neuralnetworks", "libneuralnetworks.so"),
97 // Apex/system on R (see http://b/161958857).
98 APEX_LIB("com.android.art", "libicui18n.so"),
99 APEX_LIB("com.android.art", "libicuuc.so"),
100 APEX_LIB("com.android.art", "libnativehelper.so"),
101 // Apex/system on Q.
102 APEX_LIB("com.android.runtime", "libicui18n.so"),
103 APEX_LIB("com.android.runtime", "libicuuc.so"),
104 };
105
106 static constexpr const char* kPathTranslationQ[][2] = {
107 // Apps targeting below Q can open apex libraries by system path.
108 SYSTEM_LIB("libicui18n.so"),
109 SYSTEM_LIB("libicuuc.so"),
110 SYSTEM_LIB("libneuralnetworks.so"),
111 };
112
113 static constexpr const char* kPathTranslationN[][2] = {
114 // Apps targeting below N can open greylisted libraries.
115 SYSTEM_LIB("libandroid_runtime.so"),
116 SYSTEM_LIB("libbinder.so"),
117 SYSTEM_LIB("libcrypto.so"),
118 SYSTEM_LIB("libcutils.so"),
119 SYSTEM_LIB("libexpat.so"),
120 SYSTEM_LIB("libgui.so"),
121 SYSTEM_LIB("libmedia.so"),
122 SYSTEM_LIB("libnativehelper.so"),
123 SYSTEM_LIB("libssl.so"),
124 SYSTEM_LIB("libstagefright.so"),
125 SYSTEM_LIB("libsqlite.so"),
126 SYSTEM_LIB("libui.so"),
127 SYSTEM_LIB("libutils.so"),
128 SYSTEM_LIB("libvorbisidec.so"),
129 };
130
131 if (name == nullptr) {
132 return false;
133 }
134
135 auto comparator = [name](auto p) { return strcmp(name, p[0]) == 0; };
136
137 if (auto it = std::find_if(std::begin(kPathTranslation), std::end(kPathTranslation), comparator);
138 it != std::end(kPathTranslation)) {
139 *out_name = (*it)[1];
140 return true;
141 }
142
143 if (get_application_target_sdk_version() < __ANDROID_API_Q__) {
144 if (auto it =
145 std::find_if(std::begin(kPathTranslationQ), std::end(kPathTranslationQ), comparator);
146 it != std::end(kPathTranslationQ)) {
147 *out_name = (*it)[1];
148 return true;
149 }
150 }
151
152 if (get_application_target_sdk_version() < __ANDROID_API_N__) {
153 if (auto it =
154 std::find_if(std::begin(kPathTranslationN), std::end(kPathTranslationN), comparator);
155 it != std::end(kPathTranslationN)) {
156 *out_name = (*it)[1];
157 return true;
158 }
159 }
160
161 return false;
162 }
163