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Dimitry Ivanovac1b1912015-12-01 13:56:44 -08001/*
2 * Copyright (C) 2015 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 "nativeloader/native_loader.h"
18#include "ScopedUtfChars.h"
19
20#include <dlfcn.h>
21#ifdef __ANDROID__
22#include <android/dlext.h>
23#include "cutils/properties.h"
Dimitry Ivanov4cd07682016-02-23 14:23:51 -080024#include "log/log.h"
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080025#endif
26
27#include <algorithm>
28#include <vector>
29#include <string>
30#include <mutex>
31
Elliott Hughes8b047142015-12-08 10:38:59 -080032#include "android-base/macros.h"
33#include "android-base/strings.h"
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080034
35namespace android {
36
37#ifdef __ANDROID__
38// TODO(dimitry): move this to system properties.
39static const char* kPublicNativeLibraries = "libandroid.so:"
40 "libc.so:"
41 "libdl.so:"
42 "libEGL.so:"
43 "libGLESv1_CM.so:"
44 "libGLESv2.so:"
45 "libGLESv3.so:"
Dimitry Ivanovc24ca892016-02-02 10:40:08 -080046 "libicui18n.so:"
47 "libicuuc.so:"
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080048 "libjnigraphics.so:"
49 "liblog.so:"
50 "libmediandk.so:"
51 "libm.so:"
52 "libOpenMAXAL.so:"
53 "libOpenSLES.so:"
Dimitry Ivanovcdb6fee2016-01-13 15:19:35 -080054 "libRS.so:"
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080055 "libstdc++.so:"
Dimitry Ivanov90bf68e2016-01-08 12:35:38 -080056 "libwebviewchromium_plat_support.so:"
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080057 "libz.so";
58
59class LibraryNamespaces {
60 public:
Dimitry Ivanov6f800222016-02-22 11:27:48 -080061 LibraryNamespaces() : initialized_(false) { }
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080062
Dimitry Ivanov4cd07682016-02-23 14:23:51 -080063 android_namespace_t* Create(JNIEnv* env,
64 jobject class_loader,
65 bool is_shared,
66 jstring java_library_path,
67 jstring java_permitted_path) {
Dimitry Ivanov0d6e5942015-12-08 11:16:56 -080068 ScopedUtfChars library_path(env, java_library_path);
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080069
Dimitry Ivanov0d6e5942015-12-08 11:16:56 -080070 std::string permitted_path;
71 if (java_permitted_path != nullptr) {
72 ScopedUtfChars path(env, java_permitted_path);
73 permitted_path = path.c_str();
74 }
75
76 if (!initialized_ && !InitPublicNamespace(library_path.c_str())) {
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080077 return nullptr;
78 }
79
80 std::lock_guard<std::mutex> guard(mutex_);
81
Dimitry Ivanov34fa7042016-02-22 13:02:35 -080082 android_namespace_t* ns = FindNamespaceByClassLoader(env, class_loader);
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080083
Dimitry Ivanov4cd07682016-02-23 14:23:51 -080084 LOG_FATAL_IF(ns != nullptr, "There is already a namespace associated with this classloader");
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080085
Dimitry Ivanovd2a62202015-12-15 11:06:57 -080086 uint64_t namespace_type = ANDROID_NAMESPACE_TYPE_ISOLATED;
87 if (is_shared) {
88 namespace_type |= ANDROID_NAMESPACE_TYPE_SHARED;
89 }
90
Dimitry Ivanov34fa7042016-02-22 13:02:35 -080091 ns = android_create_namespace("classloader-namespace",
92 nullptr,
93 library_path.c_str(),
94 namespace_type,
95 java_permitted_path != nullptr ?
96 permitted_path.c_str() :
97 nullptr);
Dimitry Ivanovac1b1912015-12-01 13:56:44 -080098
Dimitry Ivanov4cd07682016-02-23 14:23:51 -080099 if (ns != nullptr) {
100 namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), ns));
101 }
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800102
103 return ns;
104 }
105
Dimitry Ivanov0cd10d82016-02-22 13:48:22 -0800106 android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
107 auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
108 [&](const std::pair<jweak, android_namespace_t*>& value) {
109 return env->IsSameObject(value.first, class_loader);
110 });
111 return it != namespaces_.end() ? it->second : nullptr;
112 }
113
Dimitry Ivanov55bbb0d2016-02-10 14:09:22 -0800114 void PreloadPublicLibraries() {
115 // android_init_namespaces() expects all the public libraries
116 // to be loaded so that they can be found by soname alone.
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800117 std::vector<std::string> sonames = android::base::Split(kPublicNativeLibraries, ":");
118 for (const auto& soname : sonames) {
Dimitry Ivanov55bbb0d2016-02-10 14:09:22 -0800119 dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE);
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800120 }
Dimitry Ivanov55bbb0d2016-02-10 14:09:22 -0800121 }
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800122
Dimitry Ivanov6f800222016-02-22 11:27:48 -0800123 private:
Dimitry Ivanov55bbb0d2016-02-10 14:09:22 -0800124 bool InitPublicNamespace(const char* library_path) {
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800125 // Some apps call dlopen from generated code unknown to linker in which
126 // case linker uses anonymous namespace. See b/25844435 for details.
127 initialized_ = android_init_namespaces(kPublicNativeLibraries, library_path);
128
129 return initialized_;
130 }
131
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800132 bool initialized_;
133 std::mutex mutex_;
134 std::vector<std::pair<jweak, android_namespace_t*>> namespaces_;
135
136 DISALLOW_COPY_AND_ASSIGN(LibraryNamespaces);
137};
138
139static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
Dimitry Ivanov4cd07682016-02-23 14:23:51 -0800140
141static bool namespaces_enabled(uint32_t target_sdk_version) {
142 return target_sdk_version > 0;
143}
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800144#endif
145
Dimitry Ivanov6f800222016-02-22 11:27:48 -0800146void PreloadPublicNativeLibraries() {
147#if defined(__ANDROID__)
148 g_namespaces->PreloadPublicLibraries();
149#endif
150}
151
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800152
Dimitry Ivanov4cd07682016-02-23 14:23:51 -0800153jstring CreateClassLoaderNamespace(JNIEnv* env,
154 int32_t target_sdk_version,
155 jobject class_loader,
156 bool is_shared,
157 jstring library_path,
158 jstring permitted_path) {
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800159#if defined(__ANDROID__)
Dimitry Ivanov4cd07682016-02-23 14:23:51 -0800160 if (!namespaces_enabled(target_sdk_version)) {
161 return nullptr;
162 }
163
164 android_namespace_t* ns = g_namespaces->Create(env,
165 class_loader,
166 is_shared,
167 library_path,
168 permitted_path);
169 if (ns == nullptr) {
170 return env->NewStringUTF(dlerror());
171 }
172#else
173 UNUSED(env, target_sdk_version, class_loader, is_shared,
174 library_path, permitted_path);
175#endif
176 return nullptr;
177}
178
179void* OpenNativeLibrary(JNIEnv* env,
180 int32_t target_sdk_version,
181 const char* path,
182 jobject class_loader,
183 jstring library_path) {
184#if defined(__ANDROID__)
185 if (!namespaces_enabled(target_sdk_version) || class_loader == nullptr) {
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800186 return dlopen(path, RTLD_NOW);
187 }
188
Dimitry Ivanov4cd07682016-02-23 14:23:51 -0800189 android_namespace_t* ns = g_namespaces->FindNamespaceByClassLoader(env, class_loader);
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800190
191 if (ns == nullptr) {
Dimitry Ivanov4cd07682016-02-23 14:23:51 -0800192 // This is the case where the classloader was not created by ApplicationLoaders
193 // In this case we create an isolated not-shared namespace for it.
194 ns = g_namespaces->Create(env, class_loader, false, library_path, nullptr);
195 if (ns == nullptr) {
196 return nullptr;
197 }
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800198 }
199
200 android_dlextinfo extinfo;
201 extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
202 extinfo.library_namespace = ns;
203
204 return android_dlopen_ext(path, RTLD_NOW, &extinfo);
205#else
Dimitry Ivanov4cd07682016-02-23 14:23:51 -0800206 UNUSED(env, target_sdk_version, class_loader, library_path);
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800207 return dlopen(path, RTLD_NOW);
208#endif
209}
210
Dimitry Ivanov0cd10d82016-02-22 13:48:22 -0800211#if defined(__ANDROID__)
212android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
213 return g_namespaces->FindNamespaceByClassLoader(env, class_loader);
214}
215#endif
216
Dimitry Ivanovac1b1912015-12-01 13:56:44 -0800217}; // android namespace