256 lines
8.4 KiB
C++
256 lines
8.4 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "nativeloader/native_loader.h"
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#include "ScopedUtfChars.h"
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#include <dlfcn.h>
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#ifdef __ANDROID__
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#include <android/dlext.h>
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#include "cutils/properties.h"
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#define LOG_TAG "libnativeloader"
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#include "log/log.h"
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#endif
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#include <algorithm>
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#include <vector>
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#include <string>
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#include <mutex>
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#include "android-base/file.h"
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#include "android-base/macros.h"
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#include "android-base/strings.h"
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namespace android {
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#if defined(__ANDROID__)
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static constexpr const char* kPublicNativeLibrariesConfig = "/system/etc/public.libraries.txt";
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static bool namespace_workaround_enabled(int32_t target_sdk_version) {
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return target_sdk_version <= 23;
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}
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class LibraryNamespaces {
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public:
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LibraryNamespaces() : initialized_(false) { }
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android_namespace_t* Create(JNIEnv* env,
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jobject class_loader,
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bool is_shared,
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jstring java_library_path,
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jstring java_permitted_path,
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int32_t target_sdk_version) {
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ScopedUtfChars library_path(env, java_library_path);
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std::string permitted_path;
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if (java_permitted_path != nullptr) {
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ScopedUtfChars path(env, java_permitted_path);
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permitted_path = path.c_str();
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} else {
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// (http://b/27588281) This is a workaround for apps using custom
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// classloaders and calling System.load() with an absolute path which
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// is outside of the classloader library search path.
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//
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// This part effectively allows such a classloader to access anything
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// under /data
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permitted_path = "/data";
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}
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if (!initialized_ && !InitPublicNamespace(library_path.c_str(), target_sdk_version)) {
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return nullptr;
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}
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android_namespace_t* ns = FindNamespaceByClassLoader(env, class_loader);
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LOG_ALWAYS_FATAL_IF(ns != nullptr,
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"There is already a namespace associated with this classloader");
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uint64_t namespace_type = ANDROID_NAMESPACE_TYPE_ISOLATED;
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if (is_shared) {
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namespace_type |= ANDROID_NAMESPACE_TYPE_SHARED;
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}
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ns = android_create_namespace("classloader-namespace",
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nullptr,
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library_path.c_str(),
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namespace_type,
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!permitted_path.empty() ?
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permitted_path.c_str() :
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nullptr);
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if (ns != nullptr) {
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namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), ns));
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}
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return ns;
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}
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android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
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auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
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[&](const std::pair<jweak, android_namespace_t*>& value) {
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return env->IsSameObject(value.first, class_loader);
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});
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return it != namespaces_.end() ? it->second : nullptr;
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}
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void Initialize() {
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// Read list of public native libraries from the config file.
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std::string file_content;
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LOG_ALWAYS_FATAL_IF(!base::ReadFileToString(kPublicNativeLibrariesConfig, &file_content),
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"Error reading public native library list from \"%s\": %s",
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kPublicNativeLibrariesConfig, strerror(errno));
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std::vector<std::string> lines = base::Split(file_content, "\n");
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std::vector<std::string> sonames;
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for (const auto& line : lines) {
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auto trimmed_line = base::Trim(line);
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if (trimmed_line[0] == '#' || trimmed_line.empty()) {
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continue;
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}
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sonames.push_back(trimmed_line);
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}
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public_libraries_ = base::Join(sonames, ':');
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// android_init_namespaces() expects all the public libraries
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// to be loaded so that they can be found by soname alone.
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for (const auto& soname : sonames) {
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dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE);
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}
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}
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private:
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bool InitPublicNamespace(const char* library_path, int32_t target_sdk_version) {
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std::string publicNativeLibraries = public_libraries_;
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// TODO (dimitry): This is a workaround for http://b/26436837
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// will be removed before the release.
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if (namespace_workaround_enabled(target_sdk_version)) {
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// check if libart.so is loaded.
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void* handle = dlopen("libart.so", RTLD_NOW | RTLD_NOLOAD);
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if (handle != nullptr) {
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publicNativeLibraries += ":libart.so";
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dlclose(handle);
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}
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}
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// END OF WORKAROUND
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// (http://b/25844435) - Some apps call dlopen from generated code (mono jited
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// code is one example) unknown to linker in which case linker uses anonymous
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// namespace. The second argument specifies the search path for the anonymous
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// namespace which is the library_path of the classloader.
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initialized_ = android_init_namespaces(publicNativeLibraries.c_str(), library_path);
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return initialized_;
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}
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bool initialized_;
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std::vector<std::pair<jweak, android_namespace_t*>> namespaces_;
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std::string public_libraries_;
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DISALLOW_COPY_AND_ASSIGN(LibraryNamespaces);
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};
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static std::mutex g_namespaces_mutex;
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static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
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static bool namespaces_enabled(uint32_t target_sdk_version) {
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return target_sdk_version > 0;
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}
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#endif
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void InitializeNativeLoader() {
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#if defined(__ANDROID__)
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std::lock_guard<std::mutex> guard(g_namespaces_mutex);
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g_namespaces->Initialize();
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#endif
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}
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jstring CreateClassLoaderNamespace(JNIEnv* env,
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int32_t target_sdk_version,
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jobject class_loader,
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bool is_shared,
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jstring library_path,
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jstring permitted_path) {
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#if defined(__ANDROID__)
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if (!namespaces_enabled(target_sdk_version)) {
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return nullptr;
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}
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std::lock_guard<std::mutex> guard(g_namespaces_mutex);
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android_namespace_t* ns = g_namespaces->Create(env,
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class_loader,
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is_shared,
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library_path,
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permitted_path,
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target_sdk_version);
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if (ns == nullptr) {
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return env->NewStringUTF(dlerror());
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}
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#else
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UNUSED(env, target_sdk_version, class_loader, is_shared,
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library_path, permitted_path);
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#endif
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return nullptr;
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}
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void* OpenNativeLibrary(JNIEnv* env,
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int32_t target_sdk_version,
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const char* path,
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jobject class_loader,
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jstring library_path) {
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#if defined(__ANDROID__)
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if (!namespaces_enabled(target_sdk_version) || class_loader == nullptr) {
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return dlopen(path, RTLD_NOW);
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}
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std::lock_guard<std::mutex> guard(g_namespaces_mutex);
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android_namespace_t* ns = g_namespaces->FindNamespaceByClassLoader(env, class_loader);
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if (ns == nullptr) {
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// This is the case where the classloader was not created by ApplicationLoaders
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// In this case we create an isolated not-shared namespace for it.
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ns = g_namespaces->Create(env, class_loader, false, library_path, nullptr, target_sdk_version);
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if (ns == nullptr) {
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return nullptr;
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}
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}
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android_dlextinfo extinfo;
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extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
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extinfo.library_namespace = ns;
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return android_dlopen_ext(path, RTLD_NOW, &extinfo);
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#else
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UNUSED(env, target_sdk_version, class_loader, library_path);
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return dlopen(path, RTLD_NOW);
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#endif
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}
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#if defined(__ANDROID__)
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android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
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std::lock_guard<std::mutex> guard(g_namespaces_mutex);
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return g_namespaces->FindNamespaceByClassLoader(env, class_loader);
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}
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#endif
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}; // android namespace
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