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Loader/NCCH: Add support for loading application updates (#2927)

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* loader/ncch: split NCCH parsing into its own file

* loader/ncch: add support for loading update NCCHs from the SD card

* loader/ncch: fix formatting

* file_sys/ncch_container: Return a value for OpenFile

* loader/ncch: cleanup, always instantiate overlay_ncch to base_ncch

* file_sys/ncch_container: better encryption checks, allow non-app NCCHs to load properly and for the existence of NCCH structures to be checked

* file_sys/ncch_container: pass filepath as a const reference
This commit is contained in:
Max Thomas 2017-09-25 00:17:38 -06:00 • committed by B3n30
parent d673d508dd
commit c91ccbd0ba
8 changed files with 670 additions and 439 deletions
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319
src/core/loader/ncch.cpp
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@ -13,6 +13,7 @@
#include "common/swap.h"
#include "core/core.h"
#include "core/file_sys/archive_selfncch.h"
#include "core/file_sys/ncch_container.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/service/cfg/cfg.h"
@ -27,87 +28,7 @@
namespace Loader {
static const int kMaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
/**
* Get the decompressed size of an LZSS compressed ExeFS file
* @param buffer Buffer of compressed file
* @param size Size of compressed buffer
* @return Size of decompressed buffer
*/
static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) {
u32 offset_size = *(u32*)(buffer + size - 4);
return offset_size + size;
}
/**
* Decompress ExeFS file (compressed with LZSS)
* @param compressed Compressed buffer
* @param compressed_size Size of compressed buffer
* @param decompressed Decompressed buffer
* @param decompressed_size Size of decompressed buffer
* @return True on success, otherwise false
*/
static bool LZSS_Decompress(const u8* compressed, u32 compressed_size, u8* decompressed,
u32 decompressed_size) {
const u8* footer = compressed + compressed_size - 8;
u32 buffer_top_and_bottom = *reinterpret_cast<const u32*>(footer);
u32 out = decompressed_size;
u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);
memset(decompressed, 0, decompressed_size);
memcpy(decompressed, compressed, compressed_size);
while (index > stop_index) {
u8 control = compressed[--index];
for (unsigned i = 0; i < 8; i++) {
if (index <= stop_index)
break;
if (index <= 0)
break;
if (out <= 0)
break;
if (control & 0x80) {
// Check if compression is out of bounds
if (index < 2)
return false;
index -= 2;
u32 segment_offset = compressed[index] | (compressed[index + 1] << 8);
u32 segment_size = ((segment_offset >> 12) & 15) + 3;
segment_offset &= 0x0FFF;
segment_offset += 2;
// Check if compression is out of bounds
if (out < segment_size)
return false;
for (unsigned j = 0; j < segment_size; j++) {
// Check if compression is out of bounds
if (out + segment_offset >= decompressed_size)
return false;
u8 data = decompressed[out + segment_offset];
decompressed[--out] = data;
}
} else {
// Check if compression is out of bounds
if (out < 1)
return false;
decompressed[--out] = compressed[--index];
}
control <<= 1;
}
}
return true;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// AppLoader_NCCH class
static const u64 UPDATE_MASK = 0x0000000e00000000;
FileType AppLoader_NCCH::IdentifyType(FileUtil::IOFile& file) {
u32 magic;
@ -124,15 +45,25 @@ FileType AppLoader_NCCH::IdentifyType(FileUtil::IOFile& file) {
return FileType::Error;
}
static std::string GetUpdateNCCHPath(u64_le program_id) {
u32 high = static_cast<u32>((program_id | UPDATE_MASK) >> 32);
u32 low = static_cast<u32>((program_id | UPDATE_MASK) & 0xFFFFFFFF);
return Common::StringFromFormat("%sNintendo 3DS/%s/%s/title/%08x/%08x/content/00000000.app",
FileUtil::GetUserPath(D_SDMC_IDX).c_str(), SYSTEM_ID, SDCARD_ID,
high, low);
}
std::pair<boost::optional<u32>, ResultStatus> AppLoader_NCCH::LoadKernelSystemMode() {
if (!is_loaded) {
ResultStatus res = LoadExeFS();
ResultStatus res = base_ncch.Load();
if (res != ResultStatus::Success) {
return std::make_pair(boost::none, res);
}
}
// Set the system mode as the one from the exheader.
return std::make_pair(exheader_header.arm11_system_local_caps.system_mode.Value(),
return std::make_pair(overlay_ncch->exheader_header.arm11_system_local_caps.system_mode.Value(),
ResultStatus::Success);
}
@ -144,29 +75,34 @@ ResultStatus AppLoader_NCCH::LoadExec() {
return ResultStatus::ErrorNotLoaded;
std::vector<u8> code;
if (ResultStatus::Success == ReadCode(code)) {
u64_le program_id;
if (ResultStatus::Success == ReadCode(code) &&
ResultStatus::Success == ReadProgramId(program_id)) {
std::string process_name = Common::StringFromFixedZeroTerminatedBuffer(
(const char*)exheader_header.codeset_info.name, 8);
(const char*)overlay_ncch->exheader_header.codeset_info.name, 8);
SharedPtr<CodeSet> codeset = CodeSet::Create(process_name, ncch_header.program_id);
SharedPtr<CodeSet> codeset = CodeSet::Create(process_name, program_id);
codeset->code.offset = 0;
codeset->code.addr = exheader_header.codeset_info.text.address;
codeset->code.size = exheader_header.codeset_info.text.num_max_pages * Memory::PAGE_SIZE;
codeset->code.addr = overlay_ncch->exheader_header.codeset_info.text.address;
codeset->code.size =
overlay_ncch->exheader_header.codeset_info.text.num_max_pages * Memory::PAGE_SIZE;
codeset->rodata.offset = codeset->code.offset + codeset->code.size;
codeset->rodata.addr = exheader_header.codeset_info.ro.address;
codeset->rodata.size = exheader_header.codeset_info.ro.num_max_pages * Memory::PAGE_SIZE;
codeset->rodata.addr = overlay_ncch->exheader_header.codeset_info.ro.address;
codeset->rodata.size =
overlay_ncch->exheader_header.codeset_info.ro.num_max_pages * Memory::PAGE_SIZE;
// TODO(yuriks): Not sure if the bss size is added to the page-aligned .data size or just
// to the regular size. Playing it safe for now.
u32 bss_page_size = (exheader_header.codeset_info.bss_size + 0xFFF) & ~0xFFF;
u32 bss_page_size = (overlay_ncch->exheader_header.codeset_info.bss_size + 0xFFF) & ~0xFFF;
code.resize(code.size() + bss_page_size, 0);
codeset->data.offset = codeset->rodata.offset + codeset->rodata.size;
codeset->data.addr = exheader_header.codeset_info.data.address;
codeset->data.addr = overlay_ncch->exheader_header.codeset_info.data.address;
codeset->data.size =
exheader_header.codeset_info.data.num_max_pages * Memory::PAGE_SIZE + bss_page_size;
overlay_ncch->exheader_header.codeset_info.data.num_max_pages * Memory::PAGE_SIZE +
bss_page_size;
codeset->entrypoint = codeset->code.addr;
codeset->memory = std::make_shared<std::vector<u8>>(std::move(code));
@ -177,150 +113,27 @@ ResultStatus AppLoader_NCCH::LoadExec() {
// Attach a resource limit to the process based on the resource limit category
Kernel::g_current_process->resource_limit =
Kernel::ResourceLimit::GetForCategory(static_cast<Kernel::ResourceLimitCategory>(
exheader_header.arm11_system_local_caps.resource_limit_category));
overlay_ncch->exheader_header.arm11_system_local_caps.resource_limit_category));
// Set the default CPU core for this process
Kernel::g_current_process->ideal_processor =
exheader_header.arm11_system_local_caps.ideal_processor;
overlay_ncch->exheader_header.arm11_system_local_caps.ideal_processor;
// Copy data while converting endianness
std::array<u32, ARRAY_SIZE(exheader_header.arm11_kernel_caps.descriptors)> kernel_caps;
std::copy_n(exheader_header.arm11_kernel_caps.descriptors, kernel_caps.size(),
std::array<u32, ARRAY_SIZE(overlay_ncch->exheader_header.arm11_kernel_caps.descriptors)>
kernel_caps;
std::copy_n(overlay_ncch->exheader_header.arm11_kernel_caps.descriptors, kernel_caps.size(),
begin(kernel_caps));
Kernel::g_current_process->ParseKernelCaps(kernel_caps.data(), kernel_caps.size());
s32 priority = exheader_header.arm11_system_local_caps.priority;
u32 stack_size = exheader_header.codeset_info.stack_size;
s32 priority = overlay_ncch->exheader_header.arm11_system_local_caps.priority;
u32 stack_size = overlay_ncch->exheader_header.codeset_info.stack_size;
Kernel::g_current_process->Run(priority, stack_size);
return ResultStatus::Success;
}
return ResultStatus::Error;
}
ResultStatus AppLoader_NCCH::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) {
if (!file.IsOpen())
return ResultStatus::Error;
ResultStatus result = LoadExeFS();
if (result != ResultStatus::Success)
return result;
LOG_DEBUG(Loader, "%d sections:", kMaxSections);
// Iterate through the ExeFs archive until we find a section with the specified name...
for (unsigned section_number = 0; section_number < kMaxSections; section_number++) {
const auto& section = exefs_header.section[section_number];
// Load the specified section...
if (strcmp(section.name, name) == 0) {
LOG_DEBUG(Loader, "%d - offset: 0x%08X, size: 0x%08X, name: %s", section_number,
section.offset, section.size, section.name);
s64 section_offset =
(section.offset + exefs_offset + sizeof(ExeFs_Header) + ncch_offset);
file.Seek(section_offset, SEEK_SET);
if (strcmp(section.name, ".code") == 0 && is_compressed) {
// Section is compressed, read compressed .code section...
std::unique_ptr<u8[]> temp_buffer;
try {
temp_buffer.reset(new u8[section.size]);
} catch (std::bad_alloc&) {
return ResultStatus::ErrorMemoryAllocationFailed;
}
if (file.ReadBytes(&temp_buffer[0], section.size) != section.size)
return ResultStatus::Error;
// Decompress .code section...
u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0], section.size);
buffer.resize(decompressed_size);
if (!LZSS_Decompress(&temp_buffer[0], section.size, &buffer[0], decompressed_size))
return ResultStatus::ErrorInvalidFormat;
} else {
// Section is uncompressed...
buffer.resize(section.size);
if (file.ReadBytes(&buffer[0], section.size) != section.size)
return ResultStatus::Error;
}
return ResultStatus::Success;
}
}
return ResultStatus::ErrorNotUsed;
}
ResultStatus AppLoader_NCCH::LoadExeFS() {
if (is_exefs_loaded)
return ResultStatus::Success;
if (!file.IsOpen())
return ResultStatus::Error;
// Reset read pointer in case this file has been read before.
file.Seek(0, SEEK_SET);
if (file.ReadBytes(&ncch_header, sizeof(NCCH_Header)) != sizeof(NCCH_Header))
return ResultStatus::Error;
// Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
if (MakeMagic('N', 'C', 'S', 'D') == ncch_header.magic) {
LOG_DEBUG(Loader, "Only loading the first (bootable) NCCH within the NCSD file!");
ncch_offset = 0x4000;
file.Seek(ncch_offset, SEEK_SET);
file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
}
// Verify we are loading the correct file type...
if (MakeMagic('N', 'C', 'C', 'H') != ncch_header.magic)
return ResultStatus::ErrorInvalidFormat;
// Read ExHeader...
if (file.ReadBytes(&exheader_header, sizeof(ExHeader_Header)) != sizeof(ExHeader_Header))
return ResultStatus::Error;
is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
entry_point = exheader_header.codeset_info.text.address;
code_size = exheader_header.codeset_info.text.code_size;
stack_size = exheader_header.codeset_info.stack_size;
bss_size = exheader_header.codeset_info.bss_size;
core_version = exheader_header.arm11_system_local_caps.core_version;
priority = exheader_header.arm11_system_local_caps.priority;
resource_limit_category = exheader_header.arm11_system_local_caps.resource_limit_category;
LOG_DEBUG(Loader, "Name: %s", exheader_header.codeset_info.name);
LOG_DEBUG(Loader, "Program ID: %016" PRIX64, ncch_header.program_id);
LOG_DEBUG(Loader, "Code compressed: %s", is_compressed ? "yes" : "no");
LOG_DEBUG(Loader, "Entry point: 0x%08X", entry_point);
LOG_DEBUG(Loader, "Code size: 0x%08X", code_size);
LOG_DEBUG(Loader, "Stack size: 0x%08X", stack_size);
LOG_DEBUG(Loader, "Bss size: 0x%08X", bss_size);
LOG_DEBUG(Loader, "Core version: %d", core_version);
LOG_DEBUG(Loader, "Thread priority: 0x%X", priority);
LOG_DEBUG(Loader, "Resource limit category: %d", resource_limit_category);
LOG_DEBUG(Loader, "System Mode: %d",
static_cast<int>(exheader_header.arm11_system_local_caps.system_mode));
if (exheader_header.arm11_system_local_caps.program_id != ncch_header.program_id) {
LOG_ERROR(Loader, "ExHeader Program ID mismatch: the ROM is probably encrypted.");
return ResultStatus::ErrorEncrypted;
}
// Read ExeFS...
exefs_offset = ncch_header.exefs_offset * kBlockSize;
u32 exefs_size = ncch_header.exefs_size * kBlockSize;
LOG_DEBUG(Loader, "ExeFS offset: 0x%08X", exefs_offset);
LOG_DEBUG(Loader, "ExeFS size: 0x%08X", exefs_size);
file.Seek(exefs_offset + ncch_offset, SEEK_SET);
if (file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) != sizeof(ExeFs_Header))
return ResultStatus::Error;
is_exefs_loaded = true;
return ResultStatus::Success;
}
void AppLoader_NCCH::ParseRegionLockoutInfo() {
std::vector<u8> smdh_buffer;
if (ReadIcon(smdh_buffer) == ResultStatus::Success && smdh_buffer.size() >= sizeof(SMDH)) {
@ -339,23 +152,32 @@ void AppLoader_NCCH::ParseRegionLockoutInfo() {
}
ResultStatus AppLoader_NCCH::Load() {
u64_le ncch_program_id;
if (is_loaded)
return ResultStatus::ErrorAlreadyLoaded;
ResultStatus result = LoadExeFS();
ResultStatus result = base_ncch.Load();
if (result != ResultStatus::Success)
return result;
std::string program_id{Common::StringFromFormat("%016" PRIX64, ncch_header.program_id)};
ReadProgramId(ncch_program_id);
std::string program_id{Common::StringFromFormat("%016" PRIX64, ncch_program_id)};
LOG_INFO(Loader, "Program ID: %s", program_id.c_str());
update_ncch.OpenFile(GetUpdateNCCHPath(ncch_program_id));
result = update_ncch.Load();
if (result == ResultStatus::Success) {
overlay_ncch = &update_ncch;
}
Core::Telemetry().AddField(Telemetry::FieldType::Session, "ProgramId", program_id);
if (auto room_member = Network::GetRoomMember().lock()) {
Network::GameInfo game_info;
ReadTitle(game_info.name);
game_info.id = ncch_header.program_id;
game_info.id = ncch_program_id;
room_member->SendGameInfo(game_info);
}
@ -374,61 +196,40 @@ ResultStatus AppLoader_NCCH::Load() {
}
ResultStatus AppLoader_NCCH::ReadCode(std::vector<u8>& buffer) {
return LoadSectionExeFS(".code", buffer);
return overlay_ncch->LoadSectionExeFS(".code", buffer);
}
ResultStatus AppLoader_NCCH::ReadIcon(std::vector<u8>& buffer) {
return LoadSectionExeFS("icon", buffer);
return overlay_ncch->LoadSectionExeFS("icon", buffer);
}
ResultStatus AppLoader_NCCH::ReadBanner(std::vector<u8>& buffer) {
return LoadSectionExeFS("banner", buffer);
return overlay_ncch->LoadSectionExeFS("banner", buffer);
}
ResultStatus AppLoader_NCCH::ReadLogo(std::vector<u8>& buffer) {
return LoadSectionExeFS("logo", buffer);
return overlay_ncch->LoadSectionExeFS("logo", buffer);
}
ResultStatus AppLoader_NCCH::ReadProgramId(u64& out_program_id) {
if (!file.IsOpen())
return ResultStatus::Error;
ResultStatus result = LoadExeFS();
ResultStatus result = base_ncch.ReadProgramId(out_program_id);
if (result != ResultStatus::Success)
return result;
out_program_id = ncch_header.program_id;
return ResultStatus::Success;
}
ResultStatus AppLoader_NCCH::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) {
if (!file.IsOpen())
return ResultStatus::Error;
return base_ncch.ReadRomFS(romfs_file, offset, size);
}
// Check if the NCCH has a RomFS...
if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0) {
u32 romfs_offset = ncch_offset + (ncch_header.romfs_offset * kBlockSize) + 0x1000;
u32 romfs_size = (ncch_header.romfs_size * kBlockSize) - 0x1000;
ResultStatus AppLoader_NCCH::ReadUpdateRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
u64& offset, u64& size) {
ResultStatus result = update_ncch.ReadRomFS(romfs_file, offset, size);
LOG_DEBUG(Loader, "RomFS offset: 0x%08X", romfs_offset);
LOG_DEBUG(Loader, "RomFS size: 0x%08X", romfs_size);
if (file.GetSize() < romfs_offset + romfs_size)
return ResultStatus::Error;
// We reopen the file, to allow its position to be independent from file's
romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
if (!romfs_file->IsOpen())
return ResultStatus::Error;
offset = romfs_offset;
size = romfs_size;
return ResultStatus::Success;
}
LOG_DEBUG(Loader, "NCCH has no RomFS");
return ResultStatus::ErrorNotUsed;
if (result != ResultStatus::Success)
return base_ncch.ReadRomFS(romfs_file, offset, size);
}
ResultStatus AppLoader_NCCH::ReadTitle(std::string& title) {