Atmosphere/libraries/libmesosphere/source/kern_initial_process.cpp
2020-12-02 06:43:37 -08:00

217 lines
10 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 <mesosphere.hpp>
namespace ams::kern {
namespace {
struct InitialProcessInfo {
KProcess *process;
size_t stack_size;
s32 priority;
};
KVirtualAddress GetInitialProcessBinaryAddress() {
const uintptr_t end_address = KMemoryLayout::GetPageTableHeapRegion().GetEndAddress();
MESOSPHERE_ABORT_UNLESS(end_address != 0);
return end_address - InitialProcessBinarySizeMax;
}
void LoadInitialProcessBinaryHeader(InitialProcessBinaryHeader *header) {
if (header->magic != InitialProcessBinaryMagic) {
*header = *GetPointer<InitialProcessBinaryHeader>(GetInitialProcessBinaryAddress());
}
MESOSPHERE_ABORT_UNLESS(header->magic == InitialProcessBinaryMagic);
MESOSPHERE_ABORT_UNLESS(header->num_processes <= init::GetSlabResourceCounts().num_KProcess);
}
size_t GetProcessesSecureMemorySize(KVirtualAddress binary_address, const InitialProcessBinaryHeader &header) {
u8 *current = GetPointer<u8>(binary_address + sizeof(InitialProcessBinaryHeader));
const u8 * const end = GetPointer<u8>(binary_address + header.size - sizeof(KInitialProcessHeader));
size_t size = 0;
const size_t num_processes = header.num_processes;
for (size_t i = 0; i < num_processes; i++) {
/* Validate that we can read the current KIP. */
MESOSPHERE_ABORT_UNLESS(current <= end);
KInitialProcessReader reader;
MESOSPHERE_ABORT_UNLESS(reader.Attach(current));
/* If the process uses secure memory, account for that. */
if (reader.UsesSecureMemory()) {
size += util::AlignUp(reader.GetSize(), PageSize);
}
/* Advance the reader. */
current += reader.GetBinarySize();
}
return size;
}
void CreateProcesses(InitialProcessInfo *infos, KVirtualAddress binary_address, const InitialProcessBinaryHeader &header) {
u8 *current = GetPointer<u8>(binary_address + sizeof(InitialProcessBinaryHeader));
const u8 * const end = GetPointer<u8>(binary_address + header.size - sizeof(KInitialProcessHeader));
/* Decide on pools to use. */
const auto unsafe_pool = static_cast<KMemoryManager::Pool>(KSystemControl::GetCreateProcessMemoryPool());
const auto secure_pool = (GetTargetFirmware() >= TargetFirmware_2_0_0) ? KMemoryManager::Pool_Secure : unsafe_pool;
const size_t num_processes = header.num_processes;
for (size_t i = 0; i < num_processes; i++) {
/* Validate that we can read the current KIP. */
MESOSPHERE_ABORT_UNLESS(current <= end);
KInitialProcessReader reader;
MESOSPHERE_ABORT_UNLESS(reader.Attach(current));
/* Parse process parameters and reserve memory. */
ams::svc::CreateProcessParameter params;
MESOSPHERE_R_ABORT_UNLESS(reader.MakeCreateProcessParameter(std::addressof(params), true));
MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_PhysicalMemoryMax, params.code_num_pages * PageSize));
/* Create the process. */
KProcess *new_process = nullptr;
{
/* Declare page group to use for process memory. */
KPageGroup pg(std::addressof(Kernel::GetBlockInfoManager()));
/* Allocate memory for the process. */
auto &mm = Kernel::GetMemoryManager();
const auto pool = reader.UsesSecureMemory() ? secure_pool : unsafe_pool;
MESOSPHERE_R_ABORT_UNLESS(mm.AllocateAndOpen(std::addressof(pg), params.code_num_pages, KMemoryManager::EncodeOption(pool, KMemoryManager::Direction_FromFront)));
{
/* Ensure that we do not leak pages. */
ON_SCOPE_EXIT { pg.Close(); };
/* Get the temporary region. */
const auto &temp_region = KMemoryLayout::GetTempRegion();
MESOSPHERE_ABORT_UNLESS(temp_region.GetEndAddress() != 0);
/* Map the process's memory into the temporary region. */
KProcessAddress temp_address = Null<KProcessAddress>;
MESOSPHERE_R_ABORT_UNLESS(Kernel::GetKernelPageTable().MapPageGroup(std::addressof(temp_address), pg, temp_region.GetAddress(), temp_region.GetSize() / PageSize, KMemoryState_Kernel, KMemoryPermission_KernelReadWrite));
/* Load the process. */
MESOSPHERE_R_ABORT_UNLESS(reader.Load(temp_address, params));
/* Unmap the temporary mapping. */
MESOSPHERE_R_ABORT_UNLESS(Kernel::GetKernelPageTable().UnmapPageGroup(temp_address, pg, KMemoryState_Kernel));
/* Create a KProcess object. */
new_process = KProcess::Create();
MESOSPHERE_ABORT_UNLESS(new_process != nullptr);
/* Initialize the process. */
MESOSPHERE_R_ABORT_UNLESS(new_process->Initialize(params, pg, reader.GetCapabilities(), reader.GetNumCapabilities(), std::addressof(Kernel::GetSystemResourceLimit()), pool));
}
}
/* Set the process's memory permissions. */
MESOSPHERE_R_ABORT_UNLESS(reader.SetMemoryPermissions(new_process->GetPageTable(), params));
/* Register the process. */
KProcess::Register(new_process);
/* Set the ideal core id. */
new_process->SetIdealCoreId(reader.GetIdealCoreId());
/* Save the process info. */
infos[i].process = new_process;
infos[i].stack_size = reader.GetStackSize();
infos[i].priority = reader.GetPriority();
/* Advance the reader. */
current += reader.GetBinarySize();
}
}
constinit KVirtualAddress g_initial_process_binary_address = Null<KVirtualAddress>;
constinit InitialProcessBinaryHeader g_initial_process_binary_header = {};
constinit u64 g_initial_process_id_min = std::numeric_limits<u64>::max();
constinit u64 g_initial_process_id_max = std::numeric_limits<u64>::min();
}
u64 GetInitialProcessIdMin() {
return g_initial_process_id_min;
}
u64 GetInitialProcessIdMax() {
return g_initial_process_id_max;
}
size_t GetInitialProcessesSecureMemorySize() {
LoadInitialProcessBinaryHeader(&g_initial_process_binary_header);
return GetProcessesSecureMemorySize(g_initial_process_binary_address != Null<KVirtualAddress> ? g_initial_process_binary_address : GetInitialProcessBinaryAddress(), g_initial_process_binary_header);
}
void CopyInitialProcessBinaryToKernelMemory() {
LoadInitialProcessBinaryHeader(&g_initial_process_binary_header);
if (g_initial_process_binary_header.num_processes > 0) {
/* Reserve pages for the initial process binary from the system resource limit. */
auto &mm = Kernel::GetMemoryManager();
const size_t total_size = util::AlignUp(g_initial_process_binary_header.size, PageSize);
const size_t num_pages = total_size / PageSize;
MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_PhysicalMemoryMax, total_size));
/* Allocate memory for the image. */
const KMemoryManager::Pool pool = static_cast<KMemoryManager::Pool>(KSystemControl::GetCreateProcessMemoryPool());
const auto allocate_option = KMemoryManager::EncodeOption(pool, KMemoryManager::Direction_FromFront);
KVirtualAddress allocated_memory = mm.AllocateAndOpenContinuous(num_pages, 1, allocate_option);
MESOSPHERE_ABORT_UNLESS(allocated_memory != Null<KVirtualAddress>);
/* Relocate the image. */
std::memmove(GetVoidPointer(allocated_memory), GetVoidPointer(GetInitialProcessBinaryAddress()), g_initial_process_binary_header.size);
std::memset(GetVoidPointer(GetInitialProcessBinaryAddress()), 0, g_initial_process_binary_header.size);
g_initial_process_binary_address = allocated_memory;
}
}
void CreateAndRunInitialProcesses() {
/* Allocate space for the processes. */
InitialProcessInfo *infos = static_cast<InitialProcessInfo *>(__builtin_alloca(sizeof(InitialProcessInfo) * g_initial_process_binary_header.num_processes));
/* Create the processes. */
CreateProcesses(infos, g_initial_process_binary_address, g_initial_process_binary_header);
/* Release the memory used by the image. */
{
const size_t total_size = util::AlignUp(g_initial_process_binary_header.size, PageSize);
const size_t num_pages = total_size / PageSize;
Kernel::GetMemoryManager().Close(g_initial_process_binary_address, num_pages);
Kernel::GetSystemResourceLimit().Release(ams::svc::LimitableResource_PhysicalMemoryMax, total_size);
}
/* Determine the initial process id range. */
for (size_t i = 0; i < g_initial_process_binary_header.num_processes; i++) {
const auto pid = infos[i].process->GetId();
g_initial_process_id_min = std::min(g_initial_process_id_min, pid);
g_initial_process_id_max = std::max(g_initial_process_id_max, pid);
}
/* Run the processes. */
for (size_t i = 0; i < g_initial_process_binary_header.num_processes; i++) {
MESOSPHERE_R_ABORT_UNLESS(infos[i].process->Run(infos[i].priority, infos[i].stack_size));
}
}
}