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ldr_ro: Fully Implement LoadNro (command 0) 

Includes NRO and BSS error checking, maximum loaded NRO check, NRR hash check, and proper remapping of BSS data.
This commit is contained in:
Zach Hilman 2018-10-29 22:12:05 -04:00
parent 5e8e7b6019
commit 056fa43dcd
1 changed files with 111 additions and 12 deletions
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123
src/core/hle/service/ldr/ldr.cpp
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@ -231,29 +231,128 @@ public:
const VAddr bss_addr{rp.Pop<VAddr>()};
const u64 bss_size{rp.Pop<u64>()};
if (!initialized) {
LOG_ERROR(Service_LDR, "LDR:RO not initialized before use!");
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_NOT_INITIALIZED);
return;
}
if (nro.size() >= MAXIMUM_LOADED_RO) {
LOG_ERROR(Service_LDR, "Loading new NRO would exceed the maximum number of loaded NROs "
"(0x40)! Failing...");
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_MAXIMUM_NRO);
return;
}
// NRO Address does not fall on 0x1000 byte boundary
if ((nro_addr & 0xFFF) != 0) {
LOG_ERROR(Service_LDR, "NRO Address has invalid alignment (actual {:016X})!", nro_addr);
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_INVALID_ALIGNMENT);
return;
}
// NRO Size or BSS Size is zero or causes overflow
if (nro_addr + nro_size <= nro_addr || nro_size == 0 || (nro_size & 0xFFF) != 0 ||
(bss_size != 0 && bss_addr + bss_size <= bss_addr) ||
(std::numeric_limits<u64>::max() - nro_size < bss_size)) {
LOG_ERROR(Service_LDR,
"NRO Size or BSS Size is invalid! (nro_address={:016X}, nro_size={:016X}, "
"bss_address={:016X}, bss_size={:016X})",
nro_addr, nro_size, bss_addr, bss_size);
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_INVALID_SIZE);
return;
}
// Read NRO data from memory
std::vector<u8> nro_data(nro_size);
Memory::ReadBlock(nro_addr, nro_data.data(), nro_size);
// Load NRO as new executable module
const VAddr addr{*Core::CurrentProcess()->VMManager().FindFreeRegion(nro_size + bss_size)};
Loader::AppLoader_NRO::LoadNro(nro_data, fmt::format("nro-{:08x}", addr), addr);
SHA256Hash hash{};
mbedtls_sha256(nro_data.data(), nro_data.size(), hash.data(), 0);
// TODO(bunnei): This is an incomplete implementation. It was tested with Super Mario Party.
// It is currently missing:
// - Signature checks with LoadNRR
// - Checking if a module has already been loaded
// - Using/validating BSS, etc. params (these are used from NRO header instead)
// - Error checking
// - ...Probably other things
// NRO Hash is already loaded
if (std::find_if(nro.begin(), nro.end(), [&hash](const std::pair<VAddr, NROInfo>& info) {
return info.second.hash == hash;
}) != nro.end()) {
LOG_ERROR(Service_LDR, "NRO is already loaded!");
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_ALREADY_LOADED);
return;
}
// NRO Hash is not in any loaded NRR
if (std::find_if(nrr.begin(), nrr.end(),
[&hash](const std::pair<VAddr, std::vector<SHA256Hash>>& p) {
return std::find(p.second.begin(), p.second.end(), hash) !=
p.second.end();
}) == nrr.end()) {
LOG_ERROR(Service_LDR,
"NRO hash is not present in any currently loaded NRRs (hash={})!",
Common::HexArrayToString(hash));
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_MISSING_NRR_HASH);
return;
}
NROHeader header;
std::memcpy(&header, nro_data.data(), sizeof(NROHeader));
if (header.magic != Common::MakeMagic('N', 'R', 'O', '0') || header.nro_size != nro_size ||
header.bss_size != bss_size ||
header.ro_offset != header.text_offset + header.text_size ||
header.rw_offset != header.ro_offset + header.ro_size ||
nro_size != header.rw_offset + header.rw_size || (header.text_size & 0xFFF) != 0 ||
(header.ro_size & 0xFFF) != 0 || (header.rw_size & 0xFFF) != 0) {
LOG_ERROR(Service_LDR, "NRO was invalid!");
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(ERROR_INVALID_NRO);
return;
}
// Load NRO as new executable module
auto process = Core::CurrentProcess();
auto& vm_manager = process->VMManager();
auto map_address = vm_manager.FindFreeRegion(nro_size + bss_size);
ASSERT(map_address.Succeeded());
ASSERT(process->MirrorMemory(*map_address, nro_addr, nro_size,
Kernel::MemoryState::ModuleCodeStatic) == RESULT_SUCCESS);
ASSERT(process->UnmapMemory(nro_addr, 0, nro_size) == RESULT_SUCCESS);
if (bss_size > 0) {
ASSERT(process->MirrorMemory(*map_address + nro_size, bss_addr, bss_size,
Kernel::MemoryState::ModuleCodeStatic) == RESULT_SUCCESS);
ASSERT(process->UnmapMemory(bss_addr, 0, bss_size) == RESULT_SUCCESS);
}
vm_manager.ReprotectRange(*map_address, header.text_size,
Kernel::VMAPermission::ReadExecute);
vm_manager.ReprotectRange(*map_address + header.ro_offset, header.ro_size,
Kernel::VMAPermission::Read);
vm_manager.ReprotectRange(*map_address + header.rw_offset, header.rw_size,
Kernel::VMAPermission::ReadWrite);
Core::System::GetInstance().ArmInterface(0).ClearInstructionCache();
Core::System::GetInstance().ArmInterface(1).ClearInstructionCache();
Core::System::GetInstance().ArmInterface(2).ClearInstructionCache();
Core::System::GetInstance().ArmInterface(3).ClearInstructionCache();
nro.insert_or_assign(*map_address, NROInfo{hash, nro_size + bss_size});
IPC::ResponseBuilder rb{ctx, 4};
rb.Push(RESULT_SUCCESS);
rb.Push(addr);
LOG_WARNING(Service_LDR, "(STUBBED) called");
rb.Push(*map_address);
}
}
void Initialize(Kernel::HLERequestContext& ctx) {
initialized = true;
IPC::ResponseBuilder rb{ctx, 2};
rb.Push(RESULT_SUCCESS);
LOG_WARNING(Service_LDR, "(STUBBED) called");