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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nativeloader/native_loader.h"
#include "ScopedUtfChars.h"
#include <dlfcn.h>
#ifdef __ANDROID__
#include <android/dlext.h>
#include "cutils/properties.h"
#include "log/log.h"
#endif
#include <algorithm>
#include <vector>
#include <string>
#include <mutex>
#include "android-base/macros.h"
#include "android-base/strings.h"
namespace android {
#ifdef __ANDROID__
// TODO(dimitry): move this to system properties.
static const char* kPublicNativeLibraries = "libandroid.so:"
"libc.so:"
"libcamera2ndk.so:"
"libdl.so:"
"libEGL.so:"
"libGLESv1_CM.so:"
"libGLESv2.so:"
"libGLESv3.so:"
"libicui18n.so:"
"libicuuc.so:"
"libjnigraphics.so:"
"liblog.so:"
"libmediandk.so:"
"libm.so:"
"libOpenMAXAL.so:"
"libOpenSLES.so:"
"libRS.so:"
"libstdc++.so:"
"libvulkan.so:"
"libwebviewchromium_plat_support.so:"
"libz.so";
class LibraryNamespaces {
public:
LibraryNamespaces() : initialized_(false) { }
android_namespace_t* Create(JNIEnv* env,
jobject class_loader,
bool is_shared,
jstring java_library_path,
jstring java_permitted_path,
int32_t target_sdk_version) {
ScopedUtfChars library_path(env, java_library_path);
std::string permitted_path;
if (java_permitted_path != nullptr) {
ScopedUtfChars path(env, java_permitted_path);
permitted_path = path.c_str();
}
if (!initialized_ && !InitPublicNamespace(library_path.c_str(), target_sdk_version)) {
return nullptr;
}
android_namespace_t* ns = FindNamespaceByClassLoader(env, class_loader);
LOG_FATAL_IF(ns != nullptr, "There is already a namespace associated with this classloader");
uint64_t namespace_type = ANDROID_NAMESPACE_TYPE_ISOLATED;
if (is_shared) {
namespace_type |= ANDROID_NAMESPACE_TYPE_SHARED;
}
ns = android_create_namespace("classloader-namespace",
nullptr,
library_path.c_str(),
namespace_type,
java_permitted_path != nullptr ?
permitted_path.c_str() :
nullptr);
if (ns != nullptr) {
namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), ns));
}
return ns;
}
android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
[&](const std::pair<jweak, android_namespace_t*>& value) {
return env->IsSameObject(value.first, class_loader);
});
return it != namespaces_.end() ? it->second : nullptr;
}
void PreloadPublicLibraries() {
// android_init_namespaces() expects all the public libraries
// to be loaded so that they can be found by soname alone.
std::vector<std::string> sonames = android::base::Split(kPublicNativeLibraries, ":");
for (const auto& soname : sonames) {
dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE);
}
}
private:
bool InitPublicNamespace(const char* library_path, int32_t target_sdk_version) {
// Some apps call dlopen from generated code unknown to linker in which
// case linker uses anonymous namespace. See b/25844435 for details.
std::string publicNativeLibraries = kPublicNativeLibraries;
// TODO (dimitry): This is a workaround for http://b/26436837
// will be removed before the release.
if (target_sdk_version <= 23) {
// check if libart.so is loaded.
void* handle = dlopen("libart.so", RTLD_NOW | RTLD_NOLOAD);
if (handle != nullptr) {
publicNativeLibraries += ":libart.so";
dlclose(handle);
}
}
// END OF WORKAROUND
initialized_ = android_init_namespaces(publicNativeLibraries.c_str(), library_path);
return initialized_;
}
bool initialized_;
std::vector<std::pair<jweak, android_namespace_t*>> namespaces_;
DISALLOW_COPY_AND_ASSIGN(LibraryNamespaces);
};
static std::mutex g_namespaces_mutex;
static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
static bool namespaces_enabled(uint32_t target_sdk_version) {
return target_sdk_version > 0;
}
#endif
void PreloadPublicNativeLibraries() {
#if defined(__ANDROID__)
std::lock_guard<std::mutex> guard(g_namespaces_mutex);
g_namespaces->PreloadPublicLibraries();
#endif
}
jstring CreateClassLoaderNamespace(JNIEnv* env,
int32_t target_sdk_version,
jobject class_loader,
bool is_shared,
jstring library_path,
jstring permitted_path) {
#if defined(__ANDROID__)
if (!namespaces_enabled(target_sdk_version)) {
return nullptr;
}
std::lock_guard<std::mutex> guard(g_namespaces_mutex);
android_namespace_t* ns = g_namespaces->Create(env,
class_loader,
is_shared,
library_path,
permitted_path,
target_sdk_version);
if (ns == nullptr) {
return env->NewStringUTF(dlerror());
}
#else
UNUSED(env, target_sdk_version, class_loader, is_shared,
library_path, permitted_path);
#endif
return nullptr;
}
void* OpenNativeLibrary(JNIEnv* env,
int32_t target_sdk_version,
const char* path,
jobject class_loader,
jstring library_path) {
#if defined(__ANDROID__)
if (!namespaces_enabled(target_sdk_version) || class_loader == nullptr) {
return dlopen(path, RTLD_NOW);
}
std::lock_guard<std::mutex> guard(g_namespaces_mutex);
android_namespace_t* ns = g_namespaces->FindNamespaceByClassLoader(env, class_loader);
if (ns == nullptr) {
// This is the case where the classloader was not created by ApplicationLoaders
// In this case we create an isolated not-shared namespace for it.
ns = g_namespaces->Create(env, class_loader, false, library_path, nullptr, target_sdk_version);
if (ns == nullptr) {
return nullptr;
}
}
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
return android_dlopen_ext(path, RTLD_NOW, &extinfo);
#else
UNUSED(env, target_sdk_version, class_loader, library_path);
return dlopen(path, RTLD_NOW);
#endif
}
#if defined(__ANDROID__)
android_namespace_t* FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
std::lock_guard<std::mutex> guard(g_namespaces_mutex);
return g_namespaces->FindNamespaceByClassLoader(env, class_loader);
}
#endif
}; // android namespace
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