Reland: "init: run property service in a thread" (8efca4bb) · Commits · e / os / android_system_core

init/Android.bp

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -128,6 +128,7 @@ cc_library_static {
	"persistent_properties.cpp",		"persistent_properties.cpp",
	"persistent_properties.proto",		"persistent_properties.proto",
	"property_service.cpp",		"property_service.cpp",
			"property_service.proto",
	"property_type.cpp",		"property_type.cpp",
	"reboot.cpp",		"reboot.cpp",
	"reboot_utils.cpp",		"reboot_utils.cpp",

init/builtins.cpp

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -80,6 +80,7 @@
	using namespace std::literals::string_literals;		using namespace std::literals::string_literals;

	using android::base::Basename;		using android::base::Basename;
			using android::base::StartsWith;
	using android::base::unique_fd;		using android::base::unique_fd;
	using android::fs_mgr::Fstab;		using android::fs_mgr::Fstab;
	using android::fs_mgr::ReadFstabFromFile;		using android::fs_mgr::ReadFstabFromFile;
	@@ -687,6 +688,15 @@ static Result<void> do_swapon_all(const BuiltinArguments& args) {
	}		}

	static Result<void> do_setprop(const BuiltinArguments& args) {		static Result<void> do_setprop(const BuiltinArguments& args) {
			if (StartsWith(args[1], "ctl.")) {
			return Error() << "InitPropertySet: Do not set ctl. properties from init; call the Service "
			"functions directly";
			}
			if (args[1] == kRestoreconProperty) {
			return Error() << "InitPropertySet: Do not set '" << kRestoreconProperty
			<< "' from init; use the restorecon builtin directly";
			}

	property_set(args[1], args[2]);		property_set(args[1], args[2]);
	return {};		return {};
	}		}

init/init.cpp

+50 −1

Original line number	Original line	Diff line number	Diff line
	@@ -28,6 +28,9 @@
	#include <sys/types.h>		#include <sys/types.h>
	#include <unistd.h>		#include <unistd.h>

			#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
			#include <sys/_system_properties.h>

	#include <functional>		#include <functional>
	#include <map>		#include <map>
	#include <memory>		#include <memory>
	@@ -61,6 +64,7 @@
	#include "mount_handler.h"		#include "mount_handler.h"
	#include "mount_namespace.h"		#include "mount_namespace.h"
	#include "property_service.h"		#include "property_service.h"
			#include "proto_utils.h"
	#include "reboot.h"		#include "reboot.h"
	#include "reboot_utils.h"		#include "reboot_utils.h"
	#include "security.h"		#include "security.h"
	@@ -69,6 +73,7 @@
	#include "service.h"		#include "service.h"
	#include "service_parser.h"		#include "service_parser.h"
	#include "sigchld_handler.h"		#include "sigchld_handler.h"
			#include "system/core/init/property_service.pb.h"
	#include "util.h"		#include "util.h"

	using namespace std::chrono_literals;		using namespace std::chrono_literals;
	@@ -90,6 +95,7 @@ static int property_triggers_enabled = 0;
	static char qemu[32];		static char qemu[32];

	static int signal_fd = -1;		static int signal_fd = -1;
			static int property_fd = -1;

	static std::unique_ptr<Timer> waiting_for_prop(nullptr);		static std::unique_ptr<Timer> waiting_for_prop(nullptr);
	static std::string wait_prop_name;		static std::string wait_prop_name;
	@@ -613,6 +619,44 @@ static void RecordStageBoottimes(const boot_clock::time_point& second_stage_star
	selinux_start_time_ns));		selinux_start_time_ns));
	}		}

			static void HandlePropertyFd() {
			auto message = ReadMessage(property_fd);
			if (!message) {
			LOG(ERROR) << "Could not read message from property service: " << message.error();
			return;
			}

			auto property_message = PropertyMessage{};
			if (!property_message.ParseFromString(*message)) {
			LOG(ERROR) << "Could not parse message from property service";
			return;
			}

			switch (property_message.msg_case()) {
			case PropertyMessage::kControlMessage: {
			auto& control_message = property_message.control_message();
			bool success = HandleControlMessage(control_message.msg(), control_message.name(),
			control_message.pid());

			uint32_t response = success ? PROP_SUCCESS : PROP_ERROR_HANDLE_CONTROL_MESSAGE;
			if (control_message.has_fd()) {
			int fd = control_message.fd();
			TEMP_FAILURE_RETRY(send(fd, &response, sizeof(response), 0));
			close(fd);
			}
			break;
			}
			case PropertyMessage::kChangedMessage: {
			auto& changed_message = property_message.changed_message();
			property_changed(changed_message.name(), changed_message.value());
			break;
			}
			default:
			LOG(ERROR) << "Unknown message type from property service: "
			<< property_message.msg_case();
			}
			}

	int SecondStageMain(int argc, char** argv) {		int SecondStageMain(int argc, char** argv) {
	if (REBOOT_BOOTLOADER_ON_PANIC) {		if (REBOOT_BOOTLOADER_ON_PANIC) {
	InstallRebootSignalHandlers();		InstallRebootSignalHandlers();
	@@ -684,7 +728,12 @@ int SecondStageMain(int argc, char** argv) {
	UmountDebugRamdisk();		UmountDebugRamdisk();
	fs_mgr_vendor_overlay_mount_all();		fs_mgr_vendor_overlay_mount_all();
	export_oem_lock_status();		export_oem_lock_status();
	StartPropertyService(&epoll);
			StartPropertyService(&property_fd);
			if (auto result = epoll.RegisterHandler(property_fd, HandlePropertyFd); !result) {
			LOG(FATAL) << "Could not register epoll handler for property fd: " << result.error();
			}

	MountHandler mount_handler(&epoll);		MountHandler mount_handler(&epoll);
	set_usb_controller();		set_usb_controller();

init/init.h

+0 −4

Original line number	Original line	Diff line number	Diff line
	@@ -31,10 +31,6 @@ namespace init {
	Parser CreateParser(ActionManager& action_manager, ServiceList& service_list);		Parser CreateParser(ActionManager& action_manager, ServiceList& service_list);
	Parser CreateServiceOnlyParser(ServiceList& service_list);		Parser CreateServiceOnlyParser(ServiceList& service_list);

	bool HandleControlMessage(const std::string& msg, const std::string& arg, pid_t pid);

	void property_changed(const std::string& name, const std::string& value);

	bool start_waiting_for_property(const char name, const char value);		bool start_waiting_for_property(const char name, const char value);

	void DumpState();		void DumpState();

init/property_service.cpp

+101 −50

Original line number	Original line	Diff line number	Diff line
	@@ -42,6 +42,7 @@
	#include <map>		#include <map>
	#include <memory>		#include <memory>
	#include <mutex>		#include <mutex>
			#include <optional>
	#include <queue>		#include <queue>
	#include <thread>		#include <thread>
	#include <vector>		#include <vector>
	@@ -63,8 +64,10 @@
	#include "init.h"		#include "init.h"
	#include "persistent_properties.h"		#include "persistent_properties.h"
	#include "property_type.h"		#include "property_type.h"
			#include "proto_utils.h"
	#include "selinux.h"		#include "selinux.h"
	#include "subcontext.h"		#include "subcontext.h"
			#include "system/core/init/property_service.pb.h"
	#include "util.h"		#include "util.h"

	using namespace std::literals;		using namespace std::literals;
	@@ -76,6 +79,7 @@ using android::base::StartsWith;
	using android::base::StringPrintf;		using android::base::StringPrintf;
	using android::base::Timer;		using android::base::Timer;
	using android::base::Trim;		using android::base::Trim;
			using android::base::unique_fd;
	using android::base::WriteStringToFile;		using android::base::WriteStringToFile;
	using android::properties::BuildTrie;		using android::properties::BuildTrie;
	using android::properties::ParsePropertyInfoFile;		using android::properties::ParsePropertyInfoFile;
	@@ -85,18 +89,13 @@ using android::properties::PropertyInfoEntry;
	namespace android {		namespace android {
	namespace init {		namespace init {

	static constexpr const char kRestoreconProperty[] = "selinux.restorecon_recursive";

	static bool persistent_properties_loaded = false;		static bool persistent_properties_loaded = false;

	static int property_set_fd = -1;		static int property_set_fd = -1;
			static int init_socket = -1;

	static PropertyInfoAreaFile property_info_area;		static PropertyInfoAreaFile property_info_area;

	uint32_t InitPropertySet(const std::string& name, const std::string& value);

	uint32_t (*property_set)(const std::string& name, const std::string& value) = InitPropertySet;

	void CreateSerializedPropertyInfo();		void CreateSerializedPropertyInfo();

	struct PropertyAuditData {		struct PropertyAuditData {
	@@ -164,6 +163,17 @@ static bool CheckMacPerms(const std::string& name, const char* target_context,
	return has_access;		return has_access;
	}		}

			static void SendPropertyChanged(const std::string& name, const std::string& value) {
			auto property_msg = PropertyMessage{};
			auto* changed_message = property_msg.mutable_changed_message();
			changed_message->set_name(name);
			changed_message->set_value(value);

			if (auto result = SendMessage(init_socket, property_msg); !result) {
			LOG(ERROR) << "Failed to send property changed message: " << result.error();
			}
			}

	static uint32_t PropertySet(const std::string& name, const std::string& value, std::string* error) {		static uint32_t PropertySet(const std::string& name, const std::string& value, std::string* error) {
	size_t valuelen = value.size();		size_t valuelen = value.size();

	@@ -199,7 +209,16 @@ static uint32_t PropertySet(const std::string& name, const std::string& value, s
	if (persistent_properties_loaded && StartsWith(name, "persist.")) {		if (persistent_properties_loaded && StartsWith(name, "persist.")) {
	WritePersistentProperty(name, value);		WritePersistentProperty(name, value);
	}		}
	property_changed(name, value);		// If init sets ro.persistent_properties.ready to true, then it has finished writing persistent
			// properties, and we should write future persistent properties to disk.
			if (name == "ro.persistent_properties.ready" && value == "true") {
			persistent_properties_loaded = true;
			}
			// If init hasn't started its main loop, then it won't be handling property changed messages
			// anyway, so there's no need to try to send them.
			if (init_socket != -1) {
			SendPropertyChanged(name, value);
			}
	return PROP_SUCCESS;		return PROP_SUCCESS;
	}		}

	@@ -239,35 +258,10 @@ class AsyncRestorecon {
	bool thread_started_ = false;		bool thread_started_ = false;
	};		};

	uint32_t InitPropertySet(const std::string& name, const std::string& value) {
	if (StartsWith(name, "ctl.")) {
	LOG(ERROR) << "InitPropertySet: Do not set ctl. properties from init; call the Service "
	"functions directly";
	return PROP_ERROR_INVALID_NAME;
	}
	if (name == kRestoreconProperty) {
	LOG(ERROR) << "InitPropertySet: Do not set '" << kRestoreconProperty
	<< "' from init; use the restorecon builtin directly";
	return PROP_ERROR_INVALID_NAME;
	}

	uint32_t result = 0;
	ucred cr = {.pid = 1, .uid = 0, .gid = 0};
	std::string error;
	result = HandlePropertySet(name, value, kInitContext.c_str(), cr, &error);
	if (result != PROP_SUCCESS) {
	LOG(ERROR) << "Init cannot set '" << name << "' to '" << value << "': " << error;
	}

	return result;
	}

	class SocketConnection {		class SocketConnection {
	public:		public:
	SocketConnection(int socket, const ucred& cred) : socket_(socket), cred_(cred) {}		SocketConnection(int socket, const ucred& cred) : socket_(socket), cred_(cred) {}

	~SocketConnection() { close(socket_); }

	bool RecvUint32(uint32_t* value, uint32_t* timeout_ms) {		bool RecvUint32(uint32_t* value, uint32_t* timeout_ms) {
	return RecvFully(value, sizeof(*value), timeout_ms);		return RecvFully(value, sizeof(*value), timeout_ms);
	}		}
	@@ -304,6 +298,9 @@ class SocketConnection {
	}		}

	bool SendUint32(uint32_t value) {		bool SendUint32(uint32_t value) {
			if (!socket_.ok()) {
			return false;
			}
	int result = TEMP_FAILURE_RETRY(send(socket_, &value, sizeof(value), 0));		int result = TEMP_FAILURE_RETRY(send(socket_, &value, sizeof(value), 0));
	return result == sizeof(value);		return result == sizeof(value);
	}		}
	@@ -318,7 +315,9 @@ class SocketConnection {
	return true;		return true;
	}		}

	int socket() { return socket_; }		int Release() { return socket_.release(); }

			int socket() { return socket_.get(); }

	const ucred& cred() { return cred_; }		const ucred& cred() { return cred_; }

	@@ -389,12 +388,34 @@ class SocketConnection {
	return bytes_left == 0;		return bytes_left == 0;
	}		}

	int socket_;		unique_fd socket_;
	ucred cred_;		ucred cred_;

	DISALLOW_IMPLICIT_CONSTRUCTORS(SocketConnection);
	};		};

			static uint32_t SendControlMessage(const std::string& msg, const std::string& name, pid_t pid,
			SocketConnection* socket, std::string* error) {
			auto property_msg = PropertyMessage{};
			auto* control_message = property_msg.mutable_control_message();
			control_message->set_msg(msg);
			control_message->set_name(name);
			control_message->set_pid(pid);
			if (socket != nullptr) {
			control_message->set_fd(socket->socket());
			}

			if (auto result = SendMessage(init_socket, property_msg); !result) {
			*error = "Failed to send control message: " + result.error().message();
			return PROP_ERROR_HANDLE_CONTROL_MESSAGE;
			}

			if (socket != nullptr) {
			// We've successfully sent the fd to init, so release it here.
			socket->Release();
			}

			return PROP_SUCCESS;
			}

	bool CheckControlPropertyPerms(const std::string& name, const std::string& value,		bool CheckControlPropertyPerms(const std::string& name, const std::string& value,
	const std::string& source_context, const ucred& cr) {		const std::string& source_context, const ucred& cr) {
	// We check the legacy method first but these properties are dontaudit, so we only log an audit		// We check the legacy method first but these properties are dontaudit, so we only log an audit
	@@ -462,15 +483,14 @@ uint32_t CheckPermissions(const std::string& name, const std::string& value,

	// This returns one of the enum of PROP_SUCCESS or PROP_ERROR*.		// This returns one of the enum of PROP_SUCCESS or PROP_ERROR*.
	uint32_t HandlePropertySet(const std::string& name, const std::string& value,		uint32_t HandlePropertySet(const std::string& name, const std::string& value,
	const std::string& source_context, const ucred& cr, std::string* error) {		const std::string& source_context, const ucred& cr,
			SocketConnection* socket, std::string* error) {
	if (auto ret = CheckPermissions(name, value, source_context, cr, error); ret != PROP_SUCCESS) {		if (auto ret = CheckPermissions(name, value, source_context, cr, error); ret != PROP_SUCCESS) {
	return ret;		return ret;
	}		}

	if (StartsWith(name, "ctl.")) {		if (StartsWith(name, "ctl.")) {
	return HandleControlMessage(name.c_str() + 4, value, cr.pid)		return SendControlMessage(name.c_str() + 4, value, cr.pid, socket, error);
	? PROP_SUCCESS
	: PROP_ERROR_HANDLE_CONTROL_MESSAGE;
	}		}

	// sys.powerctl is a special property that is used to make the device reboot. We want to log		// sys.powerctl is a special property that is used to make the device reboot. We want to log
	@@ -501,6 +521,20 @@ uint32_t HandlePropertySet(const std::string& name, const std::string& value,
	return PropertySet(name, value, error);		return PropertySet(name, value, error);
	}		}

			uint32_t InitPropertySet(const std::string& name, const std::string& value) {
			uint32_t result = 0;
			ucred cr = {.pid = 1, .uid = 0, .gid = 0};
			std::string error;
			result = HandlePropertySet(name, value, kInitContext.c_str(), cr, nullptr, &error);
			if (result != PROP_SUCCESS) {
			LOG(ERROR) << "Init cannot set '" << name << "' to '" << value << "': " << error;
			}

			return result;
			}

			uint32_t (*property_set)(const std::string& name, const std::string& value) = InitPropertySet;

	static void handle_property_set_fd() {		static void handle_property_set_fd() {
	static constexpr uint32_t kDefaultSocketTimeout = 2000; /* ms */		static constexpr uint32_t kDefaultSocketTimeout = 2000; /* ms */

	@@ -549,7 +583,8 @@ static void handle_property_set_fd() {

	const auto& cr = socket.cred();		const auto& cr = socket.cred();
	std::string error;		std::string error;
	uint32_t result = HandlePropertySet(prop_name, prop_value, source_context, cr, &error);		uint32_t result =
			HandlePropertySet(prop_name, prop_value, source_context, cr, nullptr, &error);
	if (result != PROP_SUCCESS) {		if (result != PROP_SUCCESS) {
	LOG(ERROR) << "Unable to set property '" << prop_name << "' from uid:" << cr.uid		LOG(ERROR) << "Unable to set property '" << prop_name << "' from uid:" << cr.uid
	<< " gid:" << cr.gid << " pid:" << cr.pid << ": " << error;		<< " gid:" << cr.gid << " pid:" << cr.pid << ": " << error;
	@@ -577,11 +612,12 @@ static void handle_property_set_fd() {

	const auto& cr = socket.cred();		const auto& cr = socket.cred();
	std::string error;		std::string error;
	uint32_t result = HandlePropertySet(name, value, source_context, cr, &error);		uint32_t result = HandlePropertySet(name, value, source_context, cr, &socket, &error);
	if (result != PROP_SUCCESS) {		if (result != PROP_SUCCESS) {
	LOG(ERROR) << "Unable to set property '" << name << "' from uid:" << cr.uid		LOG(ERROR) << "Unable to set property '" << name << "' from uid:" << cr.uid
	<< " gid:" << cr.gid << " pid:" << cr.pid << ": " << error;		<< " gid:" << cr.gid << " pid:" << cr.pid << ": " << error;
	}		}

	socket.SendUint32(result);		socket.SendUint32(result);
	break;		break;
	}		}
	@@ -764,7 +800,6 @@ void load_persist_props(void) {
	for (const auto& persistent_property_record : persistent_properties.properties()) {		for (const auto& persistent_property_record : persistent_properties.properties()) {
	property_set(persistent_property_record.name(), persistent_property_record.value());		property_set(persistent_property_record.name(), persistent_property_record.value());
	}		}
	persistent_properties_loaded = true;
	property_set("ro.persistent_properties.ready", "true");		property_set("ro.persistent_properties.ready", "true");
	}		}

	@@ -985,21 +1020,37 @@ void CreateSerializedPropertyInfo() {
	selinux_android_restorecon(kPropertyInfosPath, 0);		selinux_android_restorecon(kPropertyInfosPath, 0);
	}		}

	void StartPropertyService(Epoll* epoll) {		static void PropertyServiceThread() {
			while (true) {
			handle_property_set_fd();
			}
			}

			void StartPropertyService(int* epoll_socket) {
	property_set("ro.property_service.version", "2");		property_set("ro.property_service.version", "2");

	if (auto result = CreateSocket(PROP_SERVICE_NAME, SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK,		int sockets[2];
	false, 0666, 0, 0, {})) {		if (socketpair(AF_UNIX, SOCK_SEQPACKET \| SOCK_CLOEXEC, 0, sockets) != 0) {
			PLOG(FATAL) << "Failed to socketpair() between property_service and init";
			}
			*epoll_socket = sockets[0];
			init_socket = sockets[1];

			if (auto result = CreateSocket(PROP_SERVICE_NAME, SOCK_STREAM \| SOCK_CLOEXEC, false, 0666, 0, 0,
			{})) {
	property_set_fd = *result;		property_set_fd = *result;
	} else {		} else {
	PLOG(FATAL) << "start_property_service socket creation failed: " << result.error();		LOG(FATAL) << "start_property_service socket creation failed: " << result.error();
	}		}

	listen(property_set_fd, 8);		listen(property_set_fd, 8);

	if (auto result = epoll->RegisterHandler(property_set_fd, handle_property_set_fd); !result) {		std::thread{PropertyServiceThread}.detach();
	PLOG(FATAL) << result.error();
	}		property_set = [](const std::string& key, const std::string& value) -> uint32_t {
			android::base::SetProperty(key, value);
			return 0;
			};
	}		}

	} // namespace init		} // namespace init