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bktr: Implement IVFC offset shifting

Fixes base game read errors
This commit is contained in:
Zach Hilman 2018-08-28 22:37:42 -04:00
parent 9664ce255d
commit a6e75cd45b
8 changed files with 36 additions and 8 deletions

View File

@ -215,7 +215,7 @@ VirtualFile NCA::Decrypt(NCASectionHeader s_header, VirtualFile in, u64 starting
} }
} }
NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_) NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_, u64 bktr_base_ivfc_offset)
: file(std::move(file_)), : file(std::move(file_)),
bktr_base_romfs(bktr_base_romfs_ ? std::move(bktr_base_romfs_) : nullptr) { bktr_base_romfs(bktr_base_romfs_ ? std::move(bktr_base_romfs_) : nullptr) {
status = Loader::ResultStatus::Success; status = Loader::ResultStatus::Success;
@ -292,6 +292,7 @@ NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_)
is_update = std::find_if(sections.begin(), sections.end(), [](const NCASectionHeader& header) { is_update = std::find_if(sections.begin(), sections.end(), [](const NCASectionHeader& header) {
return header.raw.header.crypto_type == NCASectionCryptoType::BKTR; return header.raw.header.crypto_type == NCASectionCryptoType::BKTR;
}) != sections.end(); }) != sections.end();
ivfc_offset = 0;
for (std::ptrdiff_t i = 0; i < number_sections; ++i) { for (std::ptrdiff_t i = 0; i < number_sections; ++i) {
auto section = sections[i]; auto section = sections[i];
@ -299,8 +300,8 @@ NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_)
if (section.raw.header.filesystem_type == NCASectionFilesystemType::ROMFS) { if (section.raw.header.filesystem_type == NCASectionFilesystemType::ROMFS) {
const size_t base_offset = const size_t base_offset =
header.section_tables[i].media_offset * MEDIA_OFFSET_MULTIPLIER; header.section_tables[i].media_offset * MEDIA_OFFSET_MULTIPLIER;
const size_t romfs_offset = ivfc_offset = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
base_offset + section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset; const size_t romfs_offset = base_offset + ivfc_offset;
const size_t romfs_size = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].size; const size_t romfs_size = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].size;
auto raw = std::make_shared<OffsetVfsFile>(file, romfs_size, romfs_offset); auto raw = std::make_shared<OffsetVfsFile>(file, romfs_size, romfs_offset);
auto dec = Decrypt(section, raw, romfs_offset); auto dec = Decrypt(section, raw, romfs_offset);
@ -414,7 +415,7 @@ NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_)
bktr_base_romfs, std::make_shared<OffsetVfsFile>(file, romfs_size, base_offset), bktr_base_romfs, std::make_shared<OffsetVfsFile>(file, romfs_size, base_offset),
relocation_block, relocation_buckets, subsection_block, subsection_buckets, relocation_block, relocation_buckets, subsection_block, subsection_buckets,
encrypted, encrypted ? key.get() : Core::Crypto::Key128{}, base_offset, encrypted, encrypted ? key.get() : Core::Crypto::Key128{}, base_offset,
romfs_offset - base_offset, section.raw.section_ctr); bktr_base_ivfc_offset, section.raw.section_ctr);
// BKTR applies to entire IVFC, so make an offset version to level 6 // BKTR applies to entire IVFC, so make an offset version to level 6
@ -511,6 +512,10 @@ VirtualFile NCA::GetBaseFile() const {
return file; return file;
} }
u64 NCA::GetBaseIVFCOffset() const {
return ivfc_offset;
}
bool NCA::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) { bool NCA::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
return false; return false;
} }

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@ -79,7 +79,8 @@ bool IsValidNCA(const NCAHeader& header);
// After construction, use GetStatus to determine if the file is valid and ready to be used. // After construction, use GetStatus to determine if the file is valid and ready to be used.
class NCA : public ReadOnlyVfsDirectory { class NCA : public ReadOnlyVfsDirectory {
public: public:
explicit NCA(VirtualFile file, VirtualFile bktr_base_romfs = nullptr); explicit NCA(VirtualFile file, VirtualFile bktr_base_romfs = nullptr,
u64 bktr_base_ivfc_offset = 0);
Loader::ResultStatus GetStatus() const; Loader::ResultStatus GetStatus() const;
std::vector<std::shared_ptr<VfsFile>> GetFiles() const override; std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
@ -96,6 +97,9 @@ public:
VirtualFile GetBaseFile() const; VirtualFile GetBaseFile() const;
// Returns the base ivfc offset used in BKTR patching.
u64 GetBaseIVFCOffset() const;
protected: protected:
bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override; bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
@ -112,6 +116,7 @@ private:
VirtualDir exefs = nullptr; VirtualDir exefs = nullptr;
VirtualFile file; VirtualFile file;
VirtualFile bktr_base_romfs; VirtualFile bktr_base_romfs;
u64 ivfc_offset;
NCAHeader header{}; NCAHeader header{};
bool has_rights_id{}; bool has_rights_id{};

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@ -51,7 +51,7 @@ size_t BKTR::Read(u8* data, size_t length, size_t offset) const {
if (!bktr_read) { if (!bktr_read) {
ASSERT_MSG(section_offset > ivfc_offset, "Offset calculation negative."); ASSERT_MSG(section_offset > ivfc_offset, "Offset calculation negative.");
return base_romfs->Read(data, length, section_offset); return base_romfs->Read(data, length, section_offset - ivfc_offset);
} }
if (!encrypted) { if (!encrypted) {

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@ -24,14 +24,15 @@ RomFSFactory::RomFSFactory(Loader::AppLoader& app_loader) {
} }
updatable = app_loader.IsRomFSUpdatable(); updatable = app_loader.IsRomFSUpdatable();
ivfc_offset = app_loader.ReadRomFSIVFCOffset();
} }
ResultVal<VirtualFile> RomFSFactory::OpenCurrentProcess() { ResultVal<VirtualFile> RomFSFactory::OpenCurrentProcess() {
if (!updatable) if (!updatable)
return MakeResult<VirtualFile>(file); return MakeResult<VirtualFile>(file);
const PatchManager patch_manager(Core::CurrentProcess()->process_id); const PatchManager patch_manager(Core::CurrentProcess()->program_id);
return MakeResult<VirtualFile>(patch_manager.PatchRomFS(file)); return MakeResult<VirtualFile>(patch_manager.PatchRomFS(file, ivfc_offset));
} }
ResultVal<VirtualFile> RomFSFactory::Open(u64 title_id, StorageId storage, ContentRecordType type) { ResultVal<VirtualFile> RomFSFactory::Open(u64 title_id, StorageId storage, ContentRecordType type) {

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@ -37,6 +37,7 @@ public:
private: private:
VirtualFile file; VirtualFile file;
bool updatable; bool updatable;
u64 ivfc_offset;
}; };
} // namespace FileSys } // namespace FileSys

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@ -214,6 +214,15 @@ public:
return true; return true;
} }
/**
* Gets the difference between the start of the IVFC header and the start of level 6 (RomFS)
* data. Needed for bktr patching.
* @return IVFC offset for romfs.
*/
virtual u64 ReadRomFSIVFCOffset() const {
return 0;
}
/** /**
* Get the title of the application * Get the title of the application
* @param title Reference to store the application title into * @param title Reference to store the application title into

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@ -71,6 +71,12 @@ ResultStatus AppLoader_NCA::ReadRomFS(FileSys::VirtualFile& dir) {
return ResultStatus::Success; return ResultStatus::Success;
} }
u64 AppLoader_NCA::ReadRomFSIVFCOffset() const {
if (nca == nullptr)
return 0;
return nca->GetBaseIVFCOffset();
}
ResultStatus AppLoader_NCA::ReadProgramId(u64& out_program_id) { ResultStatus AppLoader_NCA::ReadProgramId(u64& out_program_id) {
if (nca == nullptr || nca->GetStatus() != ResultStatus::Success) if (nca == nullptr || nca->GetStatus() != ResultStatus::Success)
return ResultStatus::ErrorNotInitialized; return ResultStatus::ErrorNotInitialized;

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@ -37,6 +37,7 @@ public:
ResultStatus Load(Kernel::SharedPtr<Kernel::Process>& process) override; ResultStatus Load(Kernel::SharedPtr<Kernel::Process>& process) override;
ResultStatus ReadRomFS(FileSys::VirtualFile& dir) override; ResultStatus ReadRomFS(FileSys::VirtualFile& dir) override;
u64 ReadRomFSIVFCOffset() const override;
ResultStatus ReadProgramId(u64& out_program_id) override; ResultStatus ReadProgramId(u64& out_program_id) override;
private: private: