Atmosphere/libraries/libmesosphere/source/svc/kern_svc_session.cpp

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/*
* 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 <mesosphere.hpp>
namespace ams::kern::svc {
/* ============================= Common ============================= */
namespace {
template<typename T>
Result CreateSession(ams::svc::Handle *out_server, ams::svc::Handle *out_client, uintptr_t name) {
/* Get the current process and handle table. */
auto &process = GetCurrentProcess();
auto &handle_table = process.GetHandleTable();
/* Declare the session we're going to allocate. */
T *session;
/* Reserve a new session from the process resource limit. */
KScopedResourceReservation session_reservation(std::addressof(process), ams::svc::LimitableResource_SessionCountMax);
if (session_reservation.Succeeded()) {
/* Allocate a session normally. */
session = T::Create();
} else {
/* We couldn't reserve a session. Check that we support dynamically expanding the resource limit. */
R_UNLESS(process.GetResourceLimit() == std::addressof(Kernel::GetSystemResourceLimit()), svc::ResultLimitReached());
R_UNLESS(KTargetSystem::IsDynamicResourceLimitsEnabled(), svc::ResultLimitReached());
/* Try to allocate a session from unused slab memory. */
session = T::CreateFromUnusedSlabMemory();
R_UNLESS(session != nullptr, svc::ResultLimitReached());
/* If we're creating a KSession, we want to add two KSessionRequests to the heap, to prevent request exhaustion. */
/* NOTE: Nintendo checks if session->DynamicCast<KSession *>() != nullptr, but there's no reason to not do this statically. */
if constexpr (std::same_as<T, KSession>) {
/* Ensure that if we fail to allocate our session requests, we close the session we created. */
auto session_guard = SCOPE_GUARD { session->Close(); };
{
for (size_t i = 0; i < 2; ++i) {
KSessionRequest *request = KSessionRequest::CreateFromUnusedSlabMemory();
R_UNLESS(request != nullptr, svc::ResultLimitReached());
request->Close();
}
}
session_guard.Cancel();
}
/* We successfully allocated a session, so add the object we allocated to the resource limit. */
Kernel::GetSystemResourceLimit().Add(ams::svc::LimitableResource_SessionCountMax, 1);
}
/* Check that we successfully created a session. */
R_UNLESS(session != nullptr, svc::ResultOutOfResource());
/* Initialize the session. */
session->Initialize(nullptr, name);
/* Commit the session reservation. */
session_reservation.Commit();
/* Ensure that we clean up the session (and its only references are handle table) on function end. */
ON_SCOPE_EXIT {
session->GetClientSession().Close();
session->GetServerSession().Close();
};
/* Register the session. */
T::Register(session);
/* Add the server session to the handle table. */
R_TRY(handle_table.Add(out_server, std::addressof(session->GetServerSession())));
/* Ensure that we maintaing a clean handle state on exit. */
auto handle_guard = SCOPE_GUARD { handle_table.Remove(*out_server); };
/* Add the client session to the handle table. */
R_TRY(handle_table.Add(out_client, std::addressof(session->GetClientSession())));
/* We succeeded! */
handle_guard.Cancel();
return ResultSuccess();
}
Result CreateSession(ams::svc::Handle *out_server, ams::svc::Handle *out_client, bool is_light, uintptr_t name) {
if (is_light) {
return CreateSession<KLightSession>(out_server, out_client, name);
} else {
return CreateSession<KSession>(out_server, out_client, name);
}
}
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Result AcceptSession(ams::svc::Handle *out, ams::svc::Handle port_handle) {
/* Get the current handle table. */
auto &handle_table = GetCurrentProcess().GetHandleTable();
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/* Get the server port. */
KScopedAutoObject port = handle_table.GetObject<KServerPort>(port_handle);
R_UNLESS(port.IsNotNull(), svc::ResultInvalidHandle());
/* Reserve an entry for the new session. */
R_TRY(handle_table.Reserve(out));
auto handle_guard = SCOPE_GUARD { handle_table.Unreserve(*out); };
/* Accept the session. */
KAutoObject *session;
if (port->IsLight()) {
session = port->AcceptLightSession();
} else {
session = port->AcceptSession();
}
/* Ensure we accepted successfully. */
R_UNLESS(session != nullptr, svc::ResultNotFound());
/* Register the session. */
handle_table.Register(*out, session);
handle_guard.Cancel();
session->Close();
return ResultSuccess();
}
}
/* ============================= 64 ABI ============================= */
Result CreateSession64(ams::svc::Handle *out_server_session_handle, ams::svc::Handle *out_client_session_handle, bool is_light, ams::svc::Address name) {
return CreateSession(out_server_session_handle, out_client_session_handle, is_light, name);
}
Result AcceptSession64(ams::svc::Handle *out_handle, ams::svc::Handle port) {
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return AcceptSession(out_handle, port);
}
/* ============================= 64From32 ABI ============================= */
Result CreateSession64From32(ams::svc::Handle *out_server_session_handle, ams::svc::Handle *out_client_session_handle, bool is_light, ams::svc::Address name) {
return CreateSession(out_server_session_handle, out_client_session_handle, is_light, name);
}
Result AcceptSession64From32(ams::svc::Handle *out_handle, ams::svc::Handle port) {
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return AcceptSession(out_handle, port);
}
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}