native_loader.cpp revision 426799d77014888315233253e96277bef13158eb 
1/*
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"
24#endif
25
26#include <algorithm>
27#include <vector>
28#include <string>
29#include <mutex>
30
31#include "android-base/macros.h"
32#include "android-base/strings.h"
33
34namespace android {
35
36#ifdef __ANDROID__
37// TODO(dimitry): move this to system properties.
38static const char* kPublicNativeLibraries = "libandroid.so:"
39                                            "libc.so:"
40                                            "libcamera2ndk.so:"
41                                            "libdl.so:"
42                                            "libEGL.so:"
43                                            "libGLESv1_CM.so:"
44                                            "libGLESv2.so:"
45                                            "libGLESv3.so:"
46                                            "libicui18n.so:"
47                                            "libicuuc.so:"
48                                            "libjnigraphics.so:"
49                                            "liblog.so:"
50                                            "libmediandk.so:"
51                                            "libm.so:"
52                                            "libOpenMAXAL.so:"
53                                            "libOpenSLES.so:"
54                                            "libRS.so:"
55                                            "libstdc++.so:"
56                                            "libvulkan.so:"
57                                            "libwebviewchromium_plat_support.so:"
58                                            "libz.so";
59
60class LibraryNamespaces {
61 public:
62  LibraryNamespaces() : initialized_(false) { }
63
64  android_namespace_t* GetOrCreate(JNIEnv* env, jobject class_loader,
65                                   bool is_shared,
66                                   jstring java_library_path,
67                                   jstring java_permitted_path,
68                                   int32_t target_sdk_version) {
69    ScopedUtfChars library_path(env, java_library_path);
70
71    std::string permitted_path;
72    if (java_permitted_path != nullptr) {
73      ScopedUtfChars path(env, java_permitted_path);
74      permitted_path = path.c_str();
75    }
76
77    if (!initialized_ && !InitPublicNamespace(library_path.c_str(), target_sdk_version)) {
78      return nullptr;
79    }
80
81    std::lock_guard<std::mutex> guard(mutex_);
82
83    android_namespace_t* ns = FindNamespaceByClassLoader(env, class_loader);
84
85    if (ns != nullptr) {
86      return ns;
87    }
88
89    uint64_t namespace_type = ANDROID_NAMESPACE_TYPE_ISOLATED;
90    if (is_shared) {
91      namespace_type |= ANDROID_NAMESPACE_TYPE_SHARED;
92    }
93
94    ns = android_create_namespace("classloader-namespace",
95                                  nullptr,
96                                  library_path.c_str(),
97                                  namespace_type,
98                                  java_permitted_path != nullptr ?
99                                      permitted_path.c_str() :
100                                      nullptr);
101
102    namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), ns));
103
104    return ns;
105  }
106
107  android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
108    auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
109                [&](const std::pair<jweak, android_namespace_t*>& value) {
110                  return env->IsSameObject(value.first, class_loader);
111                });
112    return it != namespaces_.end() ? it->second : nullptr;
113  }
114
115  void PreloadPublicLibraries() {
116    // android_init_namespaces() expects all the public libraries
117    // to be loaded so that they can be found by soname alone.
118    std::vector<std::string> sonames = android::base::Split(kPublicNativeLibraries, ":");
119    for (const auto& soname : sonames) {
120      dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE);
121    }
122  }
123
124 private:
125  bool InitPublicNamespace(const char* library_path, int32_t target_sdk_version) {
126    // Some apps call dlopen from generated code unknown to linker in which
127    // case linker uses anonymous namespace. See b/25844435 for details.
128    std::string publicNativeLibraries = kPublicNativeLibraries;
129
130    // TODO (dimitry): This is a workaround for http://b/26436837
131    // will be removed before the release.
132    if (target_sdk_version <= 23) {
133      publicNativeLibraries += ":libart.so";
134    }
135    // END OF WORKAROUND
136
137    initialized_ = android_init_namespaces(publicNativeLibraries.c_str(), library_path);
138
139    return initialized_;
140  }
141
142  bool initialized_;
143  std::mutex mutex_;
144  std::vector<std::pair<jweak, android_namespace_t*>> namespaces_;
145
146  DISALLOW_COPY_AND_ASSIGN(LibraryNamespaces);
147};
148
149static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
150#endif
151
152void PreloadPublicNativeLibraries() {
153#if defined(__ANDROID__)
154  g_namespaces->PreloadPublicLibraries();
155#endif
156}
157
158
159void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* path,
160                        jobject class_loader, bool is_shared, jstring java_library_path,
161                        jstring java_permitted_path) {
162#if defined(__ANDROID__)
163  if (target_sdk_version == 0 || class_loader == nullptr) {
164    return dlopen(path, RTLD_NOW);
165  }
166
167  android_namespace_t* ns =
168      g_namespaces->GetOrCreate(env, class_loader, is_shared,
169                                java_library_path, java_permitted_path, target_sdk_version);
170
171  if (ns == nullptr) {
172    return nullptr;
173  }
174
175  android_dlextinfo extinfo;
176  extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
177  extinfo.library_namespace = ns;
178
179  return android_dlopen_ext(path, RTLD_NOW, &extinfo);
180#else
181  UNUSED(env, target_sdk_version, class_loader, is_shared,
182         java_library_path, java_permitted_path);
183  return dlopen(path, RTLD_NOW);
184#endif
185}
186
187#if defined(__ANDROID__)
188android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
189  return g_namespaces->FindNamespaceByClassLoader(env, class_loader);
190}
191#endif
192
193}; //  android namespace
194