libnativeloader/library_namespaces.cpp - LeafOS-Project/android_art - Gitiles

 /*
  * Copyright (C) 2019 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 "library_namespaces.h"

 #include <dirent.h>
 #include <dlfcn.h>

 #include <regex>
 #include <string>
 #include <vector>

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/macros.h>
 #include <android-base/properties.h>
 #include <android-base/strings.h>
 #include <nativehelper/ScopedUtfChars.h>

 #include "nativeloader/dlext_namespaces.h"
 #include "public_libraries.h"
 #include "utils.h"

 namespace android::nativeloader {

 namespace {
 // The device may be configured to have the vendor libraries loaded to a separate namespace.
 // For historical reasons this namespace was named sphal but effectively it is intended
 // to use to load vendor libraries to separate namespace with controlled interface between
 // vendor and system namespaces.
 constexpr const char* kVendorNamespaceName = "sphal";
 constexpr const char* kVndkNamespaceName = "vndk";
 constexpr const char* kArtNamespaceName = "art";
 constexpr const char* kNeuralNetworksNamespaceName = "neuralnetworks";

 // classloader-namespace is a linker namespace that is created for the loaded
 // app. To be specific, it is created for the app classloader. When
 // System.load() is called from a Java class that is loaded from the
 // classloader, the classloader-namespace namespace associated with that
 // classloader is selected for dlopen. The namespace is configured so that its
 // search path is set to the app-local JNI directory and it is linked to the
 // platform namespace with the names of libs listed in the public.libraries.txt.
 // This way an app can only load its own JNI libraries along with the public libs.
 constexpr const char* kClassloaderNamespaceName = "classloader-namespace";
 // Same thing for vendor APKs.
 constexpr const char* kVendorClassloaderNamespaceName = "vendor-classloader-namespace";

 // (http://b/27588281) This is a workaround for apps using custom classloaders and calling
 // System.load() with an absolute path which is outside of the classloader library search path.
 // This list includes all directories app is allowed to access this way.
 constexpr const char* kWhitelistedDirectories = "/data:/mnt/expand";

 constexpr const char* kVendorLibPath = "/vendor/" LIB;
 constexpr const char* kProductLibPath = "/product/" LIB ":/system/product/" LIB;

 const std::regex kVendorDexPathRegex("(^|:)/vendor/");
 const std::regex kProductDexPathRegex("(^|:)(/system)?/product/");

 // Define origin of APK if it is from vendor partition or product partition
 using ApkOrigin = enum {
   APK_ORIGIN_DEFAULT = 0,
   APK_ORIGIN_VENDOR = 1,
   APK_ORIGIN_PRODUCT = 2,
 };

 jobject GetParentClassLoader(JNIEnv* env, jobject class_loader) {
   jclass class_loader_class = env->FindClass("java/lang/ClassLoader");
   jmethodID get_parent =
       env->GetMethodID(class_loader_class, "getParent", "()Ljava/lang/ClassLoader;");

   return env->CallObjectMethod(class_loader, get_parent);
 }

 ApkOrigin GetApkOriginFromDexPath(JNIEnv* env, jstring dex_path) {
   ApkOrigin apk_origin = APK_ORIGIN_DEFAULT;

   if (dex_path != nullptr) {
     ScopedUtfChars dex_path_utf_chars(env, dex_path);

     if (std::regex_search(dex_path_utf_chars.c_str(), kVendorDexPathRegex)) {
       apk_origin = APK_ORIGIN_VENDOR;
     }

     if (std::regex_search(dex_path_utf_chars.c_str(), kProductDexPathRegex)) {
       LOG_ALWAYS_FATAL_IF(apk_origin == APK_ORIGIN_VENDOR,
                           "Dex path contains both vendor and product partition : %s",
                           dex_path_utf_chars.c_str());

       apk_origin = APK_ORIGIN_PRODUCT;
     }
   }
   return apk_origin;
 }

 }  // namespace

 void LibraryNamespaces::Initialize() {
   // Once public namespace is initialized there is no
   // point in running this code - it will have no effect
   // on the current list of public libraries.
   if (initialized_) {
     return;
   }

   // android_init_namespaces() expects all the public libraries
   // to be loaded so that they can be found by soname alone.
   //
   // TODO(dimitry): this is a bit misleading since we do not know
   // if the vendor public library is going to be opened from /vendor/lib
   // we might as well end up loading them from /system/lib or /product/lib
   // For now we rely on CTS test to catch things like this but
   // it should probably be addressed in the future.
   for (const auto& soname : android::base::Split(preloadable_public_libraries(), ":")) {
     LOG_ALWAYS_FATAL_IF(dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE) == nullptr,
                         "Error preloading public library %s: %s", soname.c_str(), dlerror());
   }
 }

 Result<NativeLoaderNamespace*> LibraryNamespaces::Create(JNIEnv* env, uint32_t target_sdk_version,
                                                          jobject class_loader, bool is_shared,
                                                          jstring dex_path,
                                                          jstring java_library_path,
                                                          jstring java_permitted_path) {
   std::string library_path;  // empty string by default.

   if (java_library_path != nullptr) {
     ScopedUtfChars library_path_utf_chars(env, java_library_path);
     library_path = library_path_utf_chars.c_str();
   }

   ApkOrigin apk_origin = GetApkOriginFromDexPath(env, dex_path);

   // (http://b/27588281) This is a workaround for apps using custom
   // classloaders and calling System.load() with an absolute path which
   // is outside of the classloader library search path.
   //
   // This part effectively allows such a classloader to access anything
   // under /data and /mnt/expand
   std::string permitted_path = kWhitelistedDirectories;

   if (java_permitted_path != nullptr) {
     ScopedUtfChars path(env, java_permitted_path);
     if (path.c_str() != nullptr && path.size() > 0) {
       permitted_path = permitted_path + ":" + path.c_str();
     }
   }

   LOG_ALWAYS_FATAL_IF(FindNamespaceByClassLoader(env, class_loader) != nullptr,
                       "There is already a namespace associated with this classloader");

   std::string system_exposed_libraries = default_public_libraries();
   const char* namespace_name = kClassloaderNamespaceName;
   bool unbundled_vendor_or_product_app = false;
   if ((apk_origin == APK_ORIGIN_VENDOR ||
        (apk_origin == APK_ORIGIN_PRODUCT && target_sdk_version > 29)) &&
       !is_shared) {
     unbundled_vendor_or_product_app = true;
     // For vendor / product apks, give access to the vendor / product lib even though
     // they are treated as unbundled; the libs and apks are still bundled
     // together in the vendor / product partition.
     const char* origin_partition;
     const char* origin_lib_path;

     switch (apk_origin) {
       case APK_ORIGIN_VENDOR:
         origin_partition = "vendor";
         origin_lib_path = kVendorLibPath;
         break;
       case APK_ORIGIN_PRODUCT:
         origin_partition = "product";
         origin_lib_path = kProductLibPath;
         break;
       default:
         origin_partition = "unknown";
         origin_lib_path = "";
     }
     library_path = library_path + ":" + origin_lib_path;
     permitted_path = permitted_path + ":" + origin_lib_path;

     // Also give access to LLNDK libraries since they are available to vendors
     system_exposed_libraries = system_exposed_libraries + ":" + llndk_libraries().c_str();

     // Different name is useful for debugging
     namespace_name = kVendorClassloaderNamespaceName;
     ALOGD("classloader namespace configured for unbundled %s apk. library_path=%s",
           origin_partition, library_path.c_str());
   } else {
     // extended public libraries are NOT available to vendor apks, otherwise it
     // would be system->vendor violation.
     if (!extended_public_libraries().empty()) {
       system_exposed_libraries = system_exposed_libraries + ':' + extended_public_libraries();
     }
   }

   // Create the app namespace
   NativeLoaderNamespace* parent_ns = FindParentNamespaceByClassLoader(env, class_loader);
   // Heuristic: the first classloader with non-empty library_path is assumed to
   // be the main classloader for app
   // TODO(b/139178525) remove this heuristic by determining this in LoadedApk (or its
   // friends) and then passing it down to here.
   bool is_main_classloader = app_main_namespace_ == nullptr && !library_path.empty();
   // Policy: the namespace for the main classloader is also used as the
   // anonymous namespace.
   bool also_used_as_anonymous = is_main_classloader;
   // Note: this function is executed with g_namespaces_mutex held, thus no
   // racing here.
   auto app_ns = NativeLoaderNamespace::Create(
       namespace_name, library_path, permitted_path, parent_ns, is_shared,
       target_sdk_version < 24 /* is_greylist_enabled */, also_used_as_anonymous);
   if (!app_ns) {
     return app_ns.error();
   }
   // ... and link to other namespaces to allow access to some public libraries
   bool is_bridged = app_ns->IsBridged();

   auto platform_ns = NativeLoaderNamespace::GetPlatformNamespace(is_bridged);
   if (!platform_ns) {
     return platform_ns.error();
   }

   auto linked = app_ns->Link(*platform_ns, system_exposed_libraries);
   if (!linked) {
     return linked.error();
   }

   auto art_ns = NativeLoaderNamespace::GetExportedNamespace(kArtNamespaceName, is_bridged);
   // ART APEX does not exist on host, and under certain build conditions.
   if (art_ns) {
     linked = app_ns->Link(*art_ns, art_public_libraries());
     if (!linked) {
       return linked.error();
     }
   }

   // Give access to NNAPI libraries (apex-updated LLNDK library).
   auto nnapi_ns =
       NativeLoaderNamespace::GetExportedNamespace(kNeuralNetworksNamespaceName, is_bridged);
   if (nnapi_ns) {
     linked = app_ns->Link(*nnapi_ns, neuralnetworks_public_libraries());
     if (!linked) {
       return linked.error();
     }
   }

   // Give access to VNDK-SP libraries from the 'vndk' namespace.
   if (unbundled_vendor_or_product_app && !vndksp_libraries().empty()) {
     auto vndk_ns = NativeLoaderNamespace::GetExportedNamespace(kVndkNamespaceName, is_bridged);
     if (vndk_ns) {
       linked = app_ns->Link(*vndk_ns, vndksp_libraries());
       if (!linked) {
         return linked.error();
       }
     }
   }

   if (!vendor_public_libraries().empty()) {
     auto vendor_ns = NativeLoaderNamespace::GetExportedNamespace(kVendorNamespaceName, is_bridged);
     // when vendor_ns is not configured, link to the platform namespace
     auto target_ns = vendor_ns ? vendor_ns : platform_ns;
     if (target_ns) {
       linked = app_ns->Link(*target_ns, vendor_public_libraries());
       if (!linked) {
         return linked.error();
       }
     }
   }

   namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), *app_ns));
   if (is_main_classloader) {
     app_main_namespace_ = &(*app_ns);
   }

   return &(namespaces_.back().second);
 }

 NativeLoaderNamespace* LibraryNamespaces::FindNamespaceByClassLoader(JNIEnv* env,
                                                                      jobject class_loader) {
   auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
                          [&](const std::pair<jweak, NativeLoaderNamespace>& value) {
                            return env->IsSameObject(value.first, class_loader);
                          });
   if (it != namespaces_.end()) {
     return &it->second;
   }

   return nullptr;
 }

 NativeLoaderNamespace* LibraryNamespaces::FindParentNamespaceByClassLoader(JNIEnv* env,
                                                                            jobject class_loader) {
   jobject parent_class_loader = GetParentClassLoader(env, class_loader);

   while (parent_class_loader != nullptr) {
     NativeLoaderNamespace* ns;
     if ((ns = FindNamespaceByClassLoader(env, parent_class_loader)) != nullptr) {
       return ns;
     }

     parent_class_loader = GetParentClassLoader(env, parent_class_loader);
   }

   return nullptr;
 }

 }  // namespace android::nativeloader
	/*
	* Copyright (C) 2019 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 "library_namespaces.h"

	#include <dirent.h>
	#include <dlfcn.h>

	#include <regex>
	#include <string>
	#include <vector>

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <android-base/macros.h>
	#include <android-base/properties.h>
	#include <android-base/strings.h>
	#include <nativehelper/ScopedUtfChars.h>

	#include "nativeloader/dlext_namespaces.h"
	#include "public_libraries.h"
	#include "utils.h"

	namespace android::nativeloader {

	namespace {
	// The device may be configured to have the vendor libraries loaded to a separate namespace.
	// For historical reasons this namespace was named sphal but effectively it is intended
	// to use to load vendor libraries to separate namespace with controlled interface between
	// vendor and system namespaces.
	constexpr const char* kVendorNamespaceName = "sphal";
	constexpr const char* kVndkNamespaceName = "vndk";
	constexpr const char* kArtNamespaceName = "art";
	constexpr const char* kNeuralNetworksNamespaceName = "neuralnetworks";

	// classloader-namespace is a linker namespace that is created for the loaded
	// app. To be specific, it is created for the app classloader. When
	// System.load() is called from a Java class that is loaded from the
	// classloader, the classloader-namespace namespace associated with that
	// classloader is selected for dlopen. The namespace is configured so that its
	// search path is set to the app-local JNI directory and it is linked to the
	// platform namespace with the names of libs listed in the public.libraries.txt.
	// This way an app can only load its own JNI libraries along with the public libs.
	constexpr const char* kClassloaderNamespaceName = "classloader-namespace";
	// Same thing for vendor APKs.
	constexpr const char* kVendorClassloaderNamespaceName = "vendor-classloader-namespace";

	// (http://b/27588281) This is a workaround for apps using custom classloaders and calling
	// System.load() with an absolute path which is outside of the classloader library search path.
	// This list includes all directories app is allowed to access this way.
	constexpr const char* kWhitelistedDirectories = "/data:/mnt/expand";

	constexpr const char* kVendorLibPath = "/vendor/" LIB;
	constexpr const char* kProductLibPath = "/product/" LIB ":/system/product/" LIB;

	const std::regex kVendorDexPathRegex("(^\|:)/vendor/");
	const std::regex kProductDexPathRegex("(^\|:)(/system)?/product/");

	// Define origin of APK if it is from vendor partition or product partition
	using ApkOrigin = enum {
	APK_ORIGIN_DEFAULT = 0,
	APK_ORIGIN_VENDOR = 1,
	APK_ORIGIN_PRODUCT = 2,
	};

	jobject GetParentClassLoader(JNIEnv* env, jobject class_loader) {
	jclass class_loader_class = env->FindClass("java/lang/ClassLoader");
	jmethodID get_parent =
	env->GetMethodID(class_loader_class, "getParent", "()Ljava/lang/ClassLoader;");

	return env->CallObjectMethod(class_loader, get_parent);
	}

	ApkOrigin GetApkOriginFromDexPath(JNIEnv* env, jstring dex_path) {
	ApkOrigin apk_origin = APK_ORIGIN_DEFAULT;

	if (dex_path != nullptr) {
	ScopedUtfChars dex_path_utf_chars(env, dex_path);

	if (std::regex_search(dex_path_utf_chars.c_str(), kVendorDexPathRegex)) {
	apk_origin = APK_ORIGIN_VENDOR;
	}

	if (std::regex_search(dex_path_utf_chars.c_str(), kProductDexPathRegex)) {
	LOG_ALWAYS_FATAL_IF(apk_origin == APK_ORIGIN_VENDOR,
	"Dex path contains both vendor and product partition : %s",
	dex_path_utf_chars.c_str());

	apk_origin = APK_ORIGIN_PRODUCT;
	}
	}
	return apk_origin;
	}

	} // namespace

	void LibraryNamespaces::Initialize() {
	// Once public namespace is initialized there is no
	// point in running this code - it will have no effect
	// on the current list of public libraries.
	if (initialized_) {
	return;
	}

	// android_init_namespaces() expects all the public libraries
	// to be loaded so that they can be found by soname alone.
	//
	// TODO(dimitry): this is a bit misleading since we do not know
	// if the vendor public library is going to be opened from /vendor/lib
	// we might as well end up loading them from /system/lib or /product/lib
	// For now we rely on CTS test to catch things like this but
	// it should probably be addressed in the future.
	for (const auto& soname : android::base::Split(preloadable_public_libraries(), ":")) {
	LOG_ALWAYS_FATAL_IF(dlopen(soname.c_str(), RTLD_NOW \| RTLD_NODELETE) == nullptr,
	"Error preloading public library %s: %s", soname.c_str(), dlerror());
	}
	}

	Result<NativeLoaderNamespace> LibraryNamespaces::Create(JNIEnv env, uint32_t target_sdk_version,
	jobject class_loader, bool is_shared,
	jstring dex_path,
	jstring java_library_path,
	jstring java_permitted_path) {
	std::string library_path; // empty string by default.

	if (java_library_path != nullptr) {
	ScopedUtfChars library_path_utf_chars(env, java_library_path);
	library_path = library_path_utf_chars.c_str();
	}

	ApkOrigin apk_origin = GetApkOriginFromDexPath(env, dex_path);

	// (http://b/27588281) This is a workaround for apps using custom
	// classloaders and calling System.load() with an absolute path which
	// is outside of the classloader library search path.
	//
	// This part effectively allows such a classloader to access anything
	// under /data and /mnt/expand
	std::string permitted_path = kWhitelistedDirectories;

	if (java_permitted_path != nullptr) {
	ScopedUtfChars path(env, java_permitted_path);
	if (path.c_str() != nullptr && path.size() > 0) {
	permitted_path = permitted_path + ":" + path.c_str();
	}
	}

	LOG_ALWAYS_FATAL_IF(FindNamespaceByClassLoader(env, class_loader) != nullptr,
	"There is already a namespace associated with this classloader");

	std::string system_exposed_libraries = default_public_libraries();
	const char* namespace_name = kClassloaderNamespaceName;
	bool unbundled_vendor_or_product_app = false;
	if ((apk_origin == APK_ORIGIN_VENDOR \|\|
	(apk_origin == APK_ORIGIN_PRODUCT && target_sdk_version > 29)) &&
	!is_shared) {
	unbundled_vendor_or_product_app = true;
	// For vendor / product apks, give access to the vendor / product lib even though
	// they are treated as unbundled; the libs and apks are still bundled
	// together in the vendor / product partition.
	const char* origin_partition;
	const char* origin_lib_path;

	switch (apk_origin) {
	case APK_ORIGIN_VENDOR:
	origin_partition = "vendor";
	origin_lib_path = kVendorLibPath;
	break;
	case APK_ORIGIN_PRODUCT:
	origin_partition = "product";
	origin_lib_path = kProductLibPath;
	break;
	default:
	origin_partition = "unknown";
	origin_lib_path = "";
	}
	library_path = library_path + ":" + origin_lib_path;
	permitted_path = permitted_path + ":" + origin_lib_path;

	// Also give access to LLNDK libraries since they are available to vendors
	system_exposed_libraries = system_exposed_libraries + ":" + llndk_libraries().c_str();

	// Different name is useful for debugging
	namespace_name = kVendorClassloaderNamespaceName;
	ALOGD("classloader namespace configured for unbundled %s apk. library_path=%s",
	origin_partition, library_path.c_str());
	} else {
	// extended public libraries are NOT available to vendor apks, otherwise it
	// would be system->vendor violation.
	if (!extended_public_libraries().empty()) {
	system_exposed_libraries = system_exposed_libraries + ':' + extended_public_libraries();
	}
	}

	// Create the app namespace
	NativeLoaderNamespace* parent_ns = FindParentNamespaceByClassLoader(env, class_loader);
	// Heuristic: the first classloader with non-empty library_path is assumed to
	// be the main classloader for app
	// TODO(b/139178525) remove this heuristic by determining this in LoadedApk (or its
	// friends) and then passing it down to here.
	bool is_main_classloader = app_main_namespace_ == nullptr && !library_path.empty();
	// Policy: the namespace for the main classloader is also used as the
	// anonymous namespace.
	bool also_used_as_anonymous = is_main_classloader;
	// Note: this function is executed with g_namespaces_mutex held, thus no
	// racing here.
	auto app_ns = NativeLoaderNamespace::Create(
	namespace_name, library_path, permitted_path, parent_ns, is_shared,
	target_sdk_version < 24 /* is_greylist_enabled */, also_used_as_anonymous);
	if (!app_ns) {
	return app_ns.error();
	}
	// ... and link to other namespaces to allow access to some public libraries
	bool is_bridged = app_ns->IsBridged();

	auto platform_ns = NativeLoaderNamespace::GetPlatformNamespace(is_bridged);
	if (!platform_ns) {
	return platform_ns.error();
	}

	auto linked = app_ns->Link(*platform_ns, system_exposed_libraries);
	if (!linked) {
	return linked.error();
	}

	auto art_ns = NativeLoaderNamespace::GetExportedNamespace(kArtNamespaceName, is_bridged);
	// ART APEX does not exist on host, and under certain build conditions.
	if (art_ns) {
	linked = app_ns->Link(*art_ns, art_public_libraries());
	if (!linked) {
	return linked.error();
	}
	}

	// Give access to NNAPI libraries (apex-updated LLNDK library).
	auto nnapi_ns =
	NativeLoaderNamespace::GetExportedNamespace(kNeuralNetworksNamespaceName, is_bridged);
	if (nnapi_ns) {
	linked = app_ns->Link(*nnapi_ns, neuralnetworks_public_libraries());
	if (!linked) {
	return linked.error();
	}
	}

	// Give access to VNDK-SP libraries from the 'vndk' namespace.
	if (unbundled_vendor_or_product_app && !vndksp_libraries().empty()) {
	auto vndk_ns = NativeLoaderNamespace::GetExportedNamespace(kVndkNamespaceName, is_bridged);
	if (vndk_ns) {
	linked = app_ns->Link(*vndk_ns, vndksp_libraries());
	if (!linked) {
	return linked.error();
	}
	}
	}

	if (!vendor_public_libraries().empty()) {
	auto vendor_ns = NativeLoaderNamespace::GetExportedNamespace(kVendorNamespaceName, is_bridged);
	// when vendor_ns is not configured, link to the platform namespace
	auto target_ns = vendor_ns ? vendor_ns : platform_ns;
	if (target_ns) {
	linked = app_ns->Link(*target_ns, vendor_public_libraries());
	if (!linked) {
	return linked.error();
	}
	}
	}

	namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), *app_ns));
	if (is_main_classloader) {
	app_main_namespace_ = &(*app_ns);
	}

	return &(namespaces_.back().second);
	}

	NativeLoaderNamespace* LibraryNamespaces::FindNamespaceByClassLoader(JNIEnv* env,
	jobject class_loader) {
	auto it = std::find_if(namespaces_.begin(), namespaces_.end(),
	[&](const std::pair<jweak, NativeLoaderNamespace>& value) {
	return env->IsSameObject(value.first, class_loader);
	});
	if (it != namespaces_.end()) {
	return &it->second;
	}

	return nullptr;
	}

	NativeLoaderNamespace* LibraryNamespaces::FindParentNamespaceByClassLoader(JNIEnv* env,
	jobject class_loader) {
	jobject parent_class_loader = GetParentClassLoader(env, class_loader);

	while (parent_class_loader != nullptr) {
	NativeLoaderNamespace* ns;
	if ((ns = FindNamespaceByClassLoader(env, parent_class_loader)) != nullptr) {
	return ns;
	}

	parent_class_loader = GetParentClassLoader(env, parent_class_loader);
	}

	return nullptr;
	}

	} // namespace android::nativeloader