Atmosphere/stratosphere/sm/source/impl/sm_service_manager.cpp
2020-04-13 22:19:44 -07:00

714 lines
29 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sm_service_manager.hpp"
namespace ams::sm::impl {
/* Anonymous namespace for implementation details. */
namespace {
/* Constexpr definitions. */
static constexpr size_t ProcessCountMax = 0x40;
static constexpr size_t ServiceCountMax = 0x100;
static constexpr size_t FutureMitmCountMax = 0x20;
static constexpr size_t AccessControlSizeMax = 0x200;
/* Types. */
struct ProcessInfo {
os::ProcessId process_id;
ncm::ProgramId program_id;
cfg::OverrideStatus override_status;
size_t access_control_size;
u8 access_control[AccessControlSizeMax];
ProcessInfo() {
this->Free();
}
void Free() {
this->process_id = os::InvalidProcessId;
this->program_id = ncm::InvalidProgramId;
this->override_status = {};
this->access_control_size = 0;
std::memset(this->access_control, 0, sizeof(this->access_control));
}
};
/* Forward declaration, for use in ServiceInfo. */
void GetMitmProcessInfo(MitmProcessInfo *out, os::ProcessId process_id);
struct ServiceInfo {
ServiceName name;
os::ProcessId owner_process_id;
os::ManagedHandle port_h;
/* Debug. */
u64 max_sessions;
bool is_light;
/* Mitm Extension. */
os::ProcessId mitm_process_id;
os::ManagedHandle mitm_port_h;
os::ManagedHandle mitm_query_h;
/* Acknowledgement members. */
bool mitm_waiting_ack;
os::ProcessId mitm_waiting_ack_process_id;
os::ManagedHandle mitm_fwd_sess_h;
ServiceInfo() {
this->Free();
}
void Free() {
/* Close any open handles. */
this->port_h.Clear();
this->mitm_port_h.Clear();
this->mitm_query_h.Clear();
this->mitm_fwd_sess_h.Clear();
/* Reset all other members. */
this->name = InvalidServiceName;
this->owner_process_id = os::InvalidProcessId;
this->max_sessions = 0;
this->is_light = false;
this->mitm_process_id = os::InvalidProcessId;
this->mitm_waiting_ack = false;
this->mitm_waiting_ack_process_id = os::InvalidProcessId;
}
void FreeMitm() {
/* Close mitm handles. */
this->mitm_port_h.Clear();
this->mitm_query_h.Clear();
/* Reset mitm members. */
this->mitm_process_id = os::InvalidProcessId;
}
void AcknowledgeMitmSession(MitmProcessInfo *out_info, Handle *out_hnd) {
/* Copy to output. */
GetMitmProcessInfo(out_info, this->mitm_waiting_ack_process_id);
*out_hnd = this->mitm_fwd_sess_h.Move();
this->mitm_waiting_ack = false;
this->mitm_waiting_ack_process_id = os::InvalidProcessId;
}
};
class AccessControlEntry {
private:
const u8 *entry;
size_t capacity;
public:
AccessControlEntry(const void *e, size_t c) : entry(reinterpret_cast<const u8 *>(e)), capacity(c) {
/* ... */
}
AccessControlEntry GetNextEntry() const {
return AccessControlEntry(this->entry + this->GetSize(), this->capacity - this->GetSize());
}
size_t GetSize() const {
return this->GetServiceNameSize() + 1;
}
size_t GetServiceNameSize() const {
return (this->entry[0] & 7) + 1;
}
ServiceName GetServiceName() const {
return ServiceName::Encode(reinterpret_cast<const char *>(this->entry + 1), this->GetServiceNameSize());
}
bool IsHost() const {
return (this->entry[0] & 0x80) != 0;
}
bool IsWildcard() const {
return this->entry[this->GetServiceNameSize()] == '*';
}
bool IsValid() const {
/* Validate that we can access data. */
if (this->entry == nullptr || this->capacity == 0) {
return false;
}
/* Validate that the size is correct. */
return this->GetSize() <= this->capacity;
}
};
class InitialProcessIdLimits {
private:
os::ProcessId min;
os::ProcessId max;
public:
InitialProcessIdLimits() {
/* Retrieve process limits. */
cfg::GetInitialProcessRange(&this->min, &this->max);
/* Ensure range is sane. */
AMS_ABORT_UNLESS(this->min <= this->max);
}
bool IsInitialProcess(os::ProcessId process_id) const {
AMS_ABORT_UNLESS(process_id != os::InvalidProcessId);
return this->min <= process_id && process_id <= this->max;
}
};
/* Static members. */
ProcessInfo g_process_list[ProcessCountMax];
ServiceInfo g_service_list[ServiceCountMax];
ServiceName g_future_mitm_list[FutureMitmCountMax];
InitialProcessIdLimits g_initial_process_id_limits;
bool g_ended_initial_defers;
/* Helper functions for interacting with processes/services. */
ProcessInfo *GetProcessInfo(os::ProcessId process_id) {
for (size_t i = 0; i < ProcessCountMax; i++) {
if (g_process_list[i].process_id == process_id) {
return &g_process_list[i];
}
}
return nullptr;
}
ProcessInfo *GetFreeProcessInfo() {
return GetProcessInfo(os::InvalidProcessId);
}
bool HasProcessInfo(os::ProcessId process_id) {
return GetProcessInfo(process_id) != nullptr;
}
bool IsInitialProcess(os::ProcessId process_id) {
return g_initial_process_id_limits.IsInitialProcess(process_id);
}
constexpr inline bool IsValidProcessId(os::ProcessId process_id) {
return process_id != os::InvalidProcessId;
}
ServiceInfo *GetServiceInfo(ServiceName service_name) {
for (size_t i = 0; i < ServiceCountMax; i++) {
if (g_service_list[i].name == service_name) {
return &g_service_list[i];
}
}
return nullptr;
}
ServiceInfo *GetFreeServiceInfo() {
return GetServiceInfo(InvalidServiceName);
}
bool HasServiceInfo(ServiceName service) {
return GetServiceInfo(service) != nullptr;
}
bool HasMitm(ServiceName service) {
const ServiceInfo *service_info = GetServiceInfo(service);
return service_info != nullptr && IsValidProcessId(service_info->mitm_process_id);
}
void GetMitmProcessInfo(MitmProcessInfo *out_info, os::ProcessId process_id) {
/* Anything that can request a mitm session must have a process info. */
const auto process_info = GetProcessInfo(process_id);
AMS_ABORT_UNLESS(process_info != nullptr);
/* Write to output. */
out_info->process_id = process_id;
out_info->program_id = process_info->program_id;
out_info->override_status = process_info->override_status;
}
bool IsMitmDisallowed(ncm::ProgramId program_id) {
/* Mitm used on certain programs can prevent the boot process from completing. */
/* TODO: Is there a way to do this that's less hardcoded? Needs design thought. */
return program_id == ncm::SystemProgramId::Loader ||
program_id == ncm::SystemProgramId::Pm ||
program_id == ncm::SystemProgramId::Spl ||
program_id == ncm::SystemProgramId::Boot ||
program_id == ncm::SystemProgramId::Ncm ||
program_id == ncm::AtmosphereProgramId::Mitm ||
program_id == ncm::SystemProgramId::Creport;
}
Result AddFutureMitmDeclaration(ServiceName service) {
for (size_t i = 0; i < FutureMitmCountMax; i++) {
if (g_future_mitm_list[i] == InvalidServiceName) {
g_future_mitm_list[i] = service;
return ResultSuccess();
}
}
return sm::ResultOutOfServices();
}
bool HasFutureMitmDeclaration(ServiceName service) {
for (size_t i = 0; i < FutureMitmCountMax; i++) {
if (g_future_mitm_list[i] == service) {
return true;
}
}
return false;
}
void ClearFutureMitmDeclaration(ServiceName service) {
for (size_t i = 0; i < FutureMitmCountMax; i++) {
if (g_future_mitm_list[i] == service) {
g_future_mitm_list[i] = InvalidServiceName;
}
}
}
void GetServiceInfoRecord(ServiceRecord *out_record, const ServiceInfo *service_info) {
out_record->service = service_info->name;
out_record->owner_process_id = service_info->owner_process_id;
out_record->max_sessions = service_info->max_sessions;
out_record->mitm_process_id = service_info->mitm_process_id;
out_record->mitm_waiting_ack_process_id = service_info->mitm_waiting_ack_process_id;
out_record->is_light = service_info->is_light;
out_record->mitm_waiting_ack = service_info->mitm_waiting_ack;
}
Result ValidateAccessControl(AccessControlEntry access_control, ServiceName service, bool is_host, bool is_wildcard) {
/* Iterate over all entries in the access control, checking to see if we have a match. */
while (access_control.IsValid()) {
if (access_control.IsHost() == is_host) {
bool is_valid = true;
if (access_control.IsWildcard() == is_wildcard) {
/* Check for exact match. */
is_valid &= access_control.GetServiceName() == service;
} else if (access_control.IsWildcard()) {
/* Also allow fuzzy match for wildcard. */
ServiceName ac_service = access_control.GetServiceName();
is_valid &= std::memcmp(&ac_service, &service, access_control.GetServiceNameSize() - 1) == 0;
}
R_SUCCEED_IF(is_valid);
}
access_control = access_control.GetNextEntry();
}
return sm::ResultNotAllowed();
}
Result ValidateAccessControl(AccessControlEntry restriction, AccessControlEntry access) {
/* Ensure that every entry in the access control is allowed by the restriction control. */
while (access.IsValid()) {
R_TRY(ValidateAccessControl(restriction, access.GetServiceName(), access.IsHost(), access.IsWildcard()));
access = access.GetNextEntry();
}
return ResultSuccess();
}
Result ValidateServiceName(ServiceName service) {
/* Service names must be non-empty. */
R_UNLESS(service.name[0] != 0, sm::ResultInvalidServiceName());
/* Get name length. */
size_t name_len;
for (name_len = 1; name_len < sizeof(service); name_len++) {
if (service.name[name_len] == 0) {
break;
}
}
/* Names must be all-zero after they end. */
while (name_len < sizeof(service)) {
R_UNLESS(service.name[name_len++] == 0, sm::ResultInvalidServiceName());
}
return ResultSuccess();
}
bool ShouldDeferForInit(ServiceName service) {
/* Once end has been called, we're done. */
if (g_ended_initial_defers) {
return false;
}
/* This is a mechanism by which certain services will always be deferred until sm:m receives a special command. */
/* This can be extended with more services as needed at a later date. */
return service == ServiceName::Encode("fsp-srv");
}
Result GetMitmServiceHandleImpl(Handle *out, ServiceInfo *service_info, const MitmProcessInfo &client_info) {
/* Send command to query if we should mitm. */
bool should_mitm;
{
Service srv { .session = service_info->mitm_query_h.Get() };
R_TRY(serviceDispatchInOut(&srv, 65000, client_info, should_mitm));
}
/* If we shouldn't mitm, give normal session. */
R_UNLESS(should_mitm, svcConnectToPort(out, service_info->port_h.Get()));
/* Create both handles. */
{
os::ManagedHandle fwd_hnd, hnd;
R_TRY(svcConnectToPort(fwd_hnd.GetPointer(), service_info->port_h.Get()));
R_TRY(svcConnectToPort(hnd.GetPointer(), service_info->mitm_port_h.Get()));
service_info->mitm_fwd_sess_h = std::move(fwd_hnd);
*out = hnd.Move();
}
service_info->mitm_waiting_ack_process_id = client_info.process_id;
service_info->mitm_waiting_ack = true;
return ResultSuccess();
}
Result GetServiceHandleImpl(Handle *out, ServiceInfo *service_info, os::ProcessId process_id) {
/* Clear handle output. */
*out = INVALID_HANDLE;
/* Check if we should return a mitm handle. */
if (IsValidProcessId(service_info->mitm_process_id) && service_info->mitm_process_id != process_id) {
/* Get mitm process info, ensure that we're allowed to mitm the given program. */
MitmProcessInfo client_info;
GetMitmProcessInfo(&client_info, process_id);
if (!IsMitmDisallowed(client_info.program_id)) {
/* We're mitm'd. Assert, because mitm service host dead is an error state. */
R_ABORT_UNLESS(GetMitmServiceHandleImpl(out, service_info, client_info));
return ResultSuccess();
}
}
/* We're not returning a mitm handle, so just return a normal port handle. */
return svcConnectToPort(out, service_info->port_h.Get());
}
Result RegisterServiceImpl(Handle *out, os::ProcessId process_id, ServiceName service, size_t max_sessions, bool is_light) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Don't try to register something already registered. */
R_UNLESS(!HasServiceInfo(service), sm::ResultAlreadyRegistered());
/* Get free service. */
ServiceInfo *free_service = GetFreeServiceInfo();
R_UNLESS(free_service != nullptr, sm::ResultOutOfServices());
/* Create the new service. */
*out = INVALID_HANDLE;
R_TRY(svcCreatePort(out, free_service->port_h.GetPointerAndClear(), max_sessions, is_light, free_service->name.name));
/* Save info. */
free_service->name = service;
free_service->owner_process_id = process_id;
free_service->max_sessions = max_sessions;
free_service->is_light = is_light;
return ResultSuccess();
}
}
/* Process management. */
Result RegisterProcess(os::ProcessId process_id, ncm::ProgramId program_id, cfg::OverrideStatus override_status, const void *acid_sac, size_t acid_sac_size, const void *aci_sac, size_t aci_sac_size) {
/* Check that access control will fit in the ServiceInfo. */
R_UNLESS(aci_sac_size <= AccessControlSizeMax, sm::ResultTooLargeAccessControl());
/* Get free process. */
ProcessInfo *proc = GetFreeProcessInfo();
R_UNLESS(proc != nullptr, sm::ResultOutOfProcesses());
/* Validate restrictions. */
R_UNLESS(aci_sac_size != 0, sm::ResultNotAllowed());
R_TRY(ValidateAccessControl(AccessControlEntry(acid_sac, acid_sac_size), AccessControlEntry(aci_sac, aci_sac_size)));
/* Save info. */
proc->process_id = process_id;
proc->program_id = program_id;
proc->override_status = override_status;
proc->access_control_size = aci_sac_size;
std::memcpy(proc->access_control, aci_sac, proc->access_control_size);
return ResultSuccess();
}
Result UnregisterProcess(os::ProcessId process_id) {
/* Find the process. */
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
proc->Free();
return ResultSuccess();
}
/* Service management. */
Result HasService(bool *out, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
*out = HasServiceInfo(service);
return ResultSuccess();
}
Result WaitService(ServiceName service) {
bool has_service = false;
R_TRY(impl::HasService(&has_service, service));
/* Wait until we have the service. */
R_UNLESS(has_service, sf::ResultRequestDeferredByUser());
return ResultSuccess();
}
Result GetServiceHandle(Handle *out, os::ProcessId process_id, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* In 8.0.0, Nintendo removed the service apm:p -- however, all homebrew attempts to get */
/* a handle to this when calling appletInitialize(). Because hbl has access to all services, */
/* This would return true, and homebrew would *wait forever* trying to get a handle to a service */
/* that will never register. Thus, in the interest of not breaking every single piece of homebrew */
/* we will provide a little first class help. */
constexpr ServiceName ApmP = ServiceName::Encode("apm:p");
R_UNLESS((hos::GetVersion() < hos::Version_8_0_0) || (service != ApmP), sm::ResultNotAllowed());
/* Check that the process is registered and allowed to get the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, false, false));
}
/* Get service info. Check to see if we need to defer this until later. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sf::ResultRequestDeferredByUser());
R_UNLESS(!ShouldDeferForInit(service), sf::ResultRequestDeferredByUser());
R_UNLESS(!HasFutureMitmDeclaration(service), sf::ResultRequestDeferredByUser());
R_UNLESS(!service_info->mitm_waiting_ack, sf::ResultRequestDeferredByUser());
/* Get a handle from the service info. */
R_TRY_CATCH(GetServiceHandleImpl(out, service_info, process_id)) {
R_CONVERT(svc::ResultOutOfSessions, sm::ResultOutOfSessions())
} R_END_TRY_CATCH;
return ResultSuccess();
}
Result RegisterService(Handle *out, os::ProcessId process_id, ServiceName service, size_t max_sessions, bool is_light) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
R_UNLESS(!HasServiceInfo(service), sm::ResultAlreadyRegistered());
return RegisterServiceImpl(out, process_id, service, max_sessions, is_light);
}
Result RegisterServiceForSelf(Handle *out, ServiceName service, size_t max_sessions) {
return RegisterServiceImpl(out, os::GetCurrentProcessId(), service, max_sessions, false);
}
Result UnregisterService(os::ProcessId process_id, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered. */
if (!IsInitialProcess(process_id)) {
R_UNLESS(HasProcessInfo(process_id), sm::ResultInvalidClient());
}
/* Ensure that the service is actually registered. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Check if we have permission to do this. */
R_UNLESS(service_info->owner_process_id == process_id, sm::ResultNotAllowed());
/* Unregister the service. */
service_info->Free();
return ResultSuccess();
}
/* Mitm extensions. */
Result HasMitm(bool *out, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
const ServiceInfo *service_info = GetServiceInfo(service);
*out = service_info != nullptr && IsValidProcessId(service_info->mitm_process_id);
return ResultSuccess();
}
Result WaitMitm(ServiceName service) {
bool has_mitm = false;
R_TRY(impl::HasMitm(&has_mitm, service));
/* Wait until we have the mitm. */
R_UNLESS(has_mitm, sf::ResultRequestDeferredByUser());
return ResultSuccess();
}
Result InstallMitm(Handle *out, Handle *out_query, os::ProcessId process_id, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
/* If it doesn't exist, defer until it does. */
R_UNLESS(service_info != nullptr, sf::ResultRequestDeferredByUser());
/* Validate that the service isn't already being mitm'd. */
R_UNLESS(!IsValidProcessId(service_info->mitm_process_id), sm::ResultAlreadyRegistered());
/* Always clear output. */
*out = INVALID_HANDLE;
*out_query = INVALID_HANDLE;
/* Create mitm handles. */
{
os::ManagedHandle hnd, port_hnd, qry_hnd, mitm_qry_hnd;
u64 x = 0;
R_TRY(svcCreatePort(hnd.GetPointer(), port_hnd.GetPointer(), service_info->max_sessions, service_info->is_light, reinterpret_cast<char *>(&x)));
R_TRY(svcCreateSession(qry_hnd.GetPointer(), mitm_qry_hnd.GetPointer(), 0, 0));
/* Copy to output. */
service_info->mitm_process_id = process_id;
service_info->mitm_port_h = std::move(port_hnd);
service_info->mitm_query_h = std::move(mitm_qry_hnd);
*out = hnd.Move();
*out_query = qry_hnd.Move();
}
/* Clear the future declaration, if one exists. */
ClearFutureMitmDeclaration(service);
return ResultSuccess();
}
Result UninstallMitm(os::ProcessId process_id, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
}
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Validate that the client process_id is the mitm process. */
R_UNLESS(service_info->mitm_process_id == process_id, sm::ResultNotAllowed());
/* Free Mitm session info. */
service_info->FreeMitm();
return ResultSuccess();
}
Result DeclareFutureMitm(os::ProcessId process_id, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered and allowed to register the service. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
R_TRY(ValidateAccessControl(AccessControlEntry(proc->access_control, proc->access_control_size), service, true, false));
}
/* Check that mitm hasn't already been registered or declared. */
R_UNLESS(!HasMitm(service), sm::ResultAlreadyRegistered());
R_UNLESS(!HasFutureMitmDeclaration(service), sm::ResultAlreadyRegistered());
/* Try to forward declare it. */
R_TRY(AddFutureMitmDeclaration(service));
return ResultSuccess();
}
Result AcknowledgeMitmSession(MitmProcessInfo *out_info, Handle *out_hnd, os::ProcessId process_id, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Check that the process is registered. */
if (!IsInitialProcess(process_id)) {
ProcessInfo *proc = GetProcessInfo(process_id);
R_UNLESS(proc != nullptr, sm::ResultInvalidClient());
}
/* Validate that the service exists. */
ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
/* Validate that the client process_id is the mitm process, and that an acknowledgement is waiting. */
R_UNLESS(service_info->mitm_process_id == process_id, sm::ResultNotAllowed());
R_UNLESS(service_info->mitm_waiting_ack, sm::ResultNotAllowed());
/* Acknowledge. */
service_info->AcknowledgeMitmSession(out_info, out_hnd);
return ResultSuccess();
}
/* Dmnt record extensions. */
Result GetServiceRecord(ServiceRecord *out, ServiceName service) {
/* Validate service name. */
R_TRY(ValidateServiceName(service));
/* Validate that the service exists. */
const ServiceInfo *service_info = GetServiceInfo(service);
R_UNLESS(service_info != nullptr, sm::ResultNotRegistered());
GetServiceInfoRecord(out, service_info);
return ResultSuccess();
}
Result ListServiceRecords(ServiceRecord *out, u64 *out_count, u64 offset, u64 max_count) {
u64 count = 0;
for (size_t i = 0; i < ServiceCountMax && count < max_count; i++) {
const ServiceInfo *service_info = &g_service_list[i];
if (service_info->name != InvalidServiceName) {
if (offset == 0) {
GetServiceInfoRecord(out++, service_info);
count++;
} else {
offset--;
}
}
}
*out_count = 0;
return ResultSuccess();
}
/* Deferral extension (works around FS bug). */
Result EndInitialDefers() {
g_ended_initial_defers = true;
return ResultSuccess();
}
}