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/*
* Copyright 2017 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.
*/
//#define LOG_NDEBUG 1
#define LOG_TAG "GraphicsEnv"
#include <graphicsenv/GraphicsEnv.h>
#include <dlfcn.h>
#include <android-base/file.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <android/dlext.h>
#include <log/log.h>
#include <sys/prctl.h>
#include <mutex>
// TODO(b/37049319) Get this from a header once one exists
extern "C" {
android_namespace_t* android_get_exported_namespace(const char*);
android_namespace_t* android_create_namespace(const char* name, const char* ld_library_path,
const char* default_library_path, uint64_t type,
const char* permitted_when_isolated_path,
android_namespace_t* parent);
bool android_link_namespaces(android_namespace_t* from, android_namespace_t* to,
const char* shared_libs_sonames);
enum {
ANDROID_NAMESPACE_TYPE_ISOLATED = 1,
ANDROID_NAMESPACE_TYPE_SHARED = 2,
};
}
namespace android {
enum NativeLibrary {
LLNDK = 0,
VNDKSP = 1,
};
static constexpr const char* kNativeLibrariesSystemConfigPath[] = {"/etc/llndk.libraries.txt",
"/etc/vndksp.libraries.txt"};
static std::string vndkVersionStr() {
#ifdef __BIONIC__
std::string version = android::base::GetProperty("ro.vndk.version", "");
if (version != "" && version != "current") {
return "." + version;
}
#endif
return "";
}
static void insertVndkVersionStr(std::string* fileName) {
LOG_ALWAYS_FATAL_IF(!fileName, "fileName should never be nullptr");
size_t insertPos = fileName->find_last_of(".");
if (insertPos == std::string::npos) {
insertPos = fileName->length();
}
fileName->insert(insertPos, vndkVersionStr());
}
static bool readConfig(const std::string& configFile, std::vector<std::string>* soNames) {
// Read list of public native libraries from the config file.
std::string fileContent;
if (!base::ReadFileToString(configFile, &fileContent)) {
return false;
}
std::vector<std::string> lines = base::Split(fileContent, "\n");
for (auto& line : lines) {
auto trimmedLine = base::Trim(line);
if (!trimmedLine.empty()) {
soNames->push_back(trimmedLine);
}
}
return true;
}
static const std::string getSystemNativeLibraries(NativeLibrary type) {
static const char* androidRootEnv = getenv("ANDROID_ROOT");
static const std::string rootDir = androidRootEnv != nullptr ? androidRootEnv : "/system";
std::string nativeLibrariesSystemConfig = rootDir + kNativeLibrariesSystemConfigPath[type];
insertVndkVersionStr(&nativeLibrariesSystemConfig);
std::vector<std::string> soNames;
if (!readConfig(nativeLibrariesSystemConfig, &soNames)) {
ALOGE("Failed to retrieve library names from %s", nativeLibrariesSystemConfig.c_str());
return "";
}
return base::Join(soNames, ':');
}
/*static*/ GraphicsEnv& GraphicsEnv::getInstance() {
static GraphicsEnv env;
return env;
}
void GraphicsEnv::setDriverPathAndSphalLibraries(const std::string path,
const std::string sphalLibraries) {
if (!mDriverPath.empty() || !mSphalLibraries.empty()) {
ALOGV("ignoring attempt to change driver path from '%s' to '%s' or change sphal libraries "
"from '%s' to '%s'",
mDriverPath.c_str(), path.c_str(), mSphalLibraries.c_str(), sphalLibraries.c_str());
return;
}
ALOGV("setting driver path to '%s' and sphal libraries to '%s'", path.c_str(),
sphalLibraries.c_str());
mDriverPath = path;
mSphalLibraries = sphalLibraries;
}
void GraphicsEnv::setLayerPaths(NativeLoaderNamespace* appNamespace, const std::string layerPaths) {
if (mLayerPaths.empty()) {
mLayerPaths = layerPaths;
mAppNamespace = appNamespace;
} else {
ALOGV("Vulkan layer search path already set, not clobbering with '%s' for namespace %p'",
layerPaths.c_str(), appNamespace);
}
}
NativeLoaderNamespace* GraphicsEnv::getAppNamespace() {
return mAppNamespace;
}
const std::string GraphicsEnv::getLayerPaths(){
return mLayerPaths;
}
const std::string GraphicsEnv::getDebugLayers() {
return mDebugLayers;
}
void GraphicsEnv::setDebugLayers(const std::string layers) {
mDebugLayers = layers;
}
android_namespace_t* GraphicsEnv::getDriverNamespace() {
static std::once_flag once;
std::call_once(once, [this]() {
if (mDriverPath.empty()) return;
auto vndkNamespace = android_get_exported_namespace("vndk");
if (!vndkNamespace) return;
mDriverNamespace = android_create_namespace("gfx driver",
mDriverPath.c_str(), // ld_library_path
mDriverPath.c_str(), // default_library_path
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr, // permitted_when_isolated_path
nullptr);
const std::string llndkLibraries = getSystemNativeLibraries(NativeLibrary::LLNDK);
if (llndkLibraries.empty()) {
mDriverNamespace = nullptr;
return;
}
if (!android_link_namespaces(mDriverNamespace, nullptr, llndkLibraries.c_str())) {
ALOGE("Failed to link default namespace[%s]", dlerror());
mDriverNamespace = nullptr;
return;
}
const std::string vndkspLibraries = getSystemNativeLibraries(NativeLibrary::VNDKSP);
if (vndkspLibraries.empty()) {
mDriverNamespace = nullptr;
return;
}
if (!android_link_namespaces(mDriverNamespace, vndkNamespace, vndkspLibraries.c_str())) {
ALOGE("Failed to link vndk namespace[%s]", dlerror());
mDriverNamespace = nullptr;
return;
}
if (mSphalLibraries.empty()) return;
// Make additional libraries in sphal to be accessible
auto sphalNamespace = android_get_exported_namespace("sphal");
if (!sphalNamespace) {
ALOGE("Depend on these libraries[%s] in sphal, but failed to get sphal namespace",
mSphalLibraries.c_str());
mDriverNamespace = nullptr;
return;
}
if (!android_link_namespaces(mDriverNamespace, sphalNamespace, mSphalLibraries.c_str())) {
ALOGE("Failed to link sphal namespace[%s]", dlerror());
mDriverNamespace = nullptr;
return;
}
});
return mDriverNamespace;
}
} // namespace android
extern "C" android_namespace_t* android_getDriverNamespace() {
return android::GraphicsEnv::getInstance().getDriverNamespace();
}
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