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Diffstat (limited to 'src/core/hle/service/ro/ro_nro_utils.cpp')
| -rw-r--r-- | src/core/hle/service/ro/ro_nro_utils.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/core/hle/service/ro/ro_nro_utils.cpp b/src/core/hle/service/ro/ro_nro_utils.cpp new file mode 100644 index 000000000..268c7f93e --- /dev/null +++ b/src/core/hle/service/ro/ro_nro_utils.cpp @@ -0,0 +1,185 @@ +// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#include "core/hle/kernel/k_process.h" +#include "core/hle/service/ro/ro_nro_utils.h" +#include "core/hle/service/ro/ro_results.h" + +namespace Service::RO { + +namespace { + +struct ProcessMemoryRegion { + u64 address; + u64 size; +}; + +size_t GetTotalProcessMemoryRegionSize(const ProcessMemoryRegion* regions, size_t num_regions) { + size_t total = 0; + + for (size_t i = 0; i < num_regions; ++i) { + total += regions[i].size; + } + + return total; +} + +size_t SetupNroProcessMemoryRegions(ProcessMemoryRegion* regions, u64 nro_heap_address, + u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size) { + // Reset region count. + size_t num_regions = 0; + + // We always want a region for the nro. + regions[num_regions++] = {nro_heap_address, nro_heap_size}; + + // If we have bss, create a region for bss. + if (bss_heap_size > 0) { + regions[num_regions++] = {bss_heap_address, bss_heap_size}; + } + + return num_regions; +} + +Result SetProcessMemoryPermission(Kernel::KProcess* process, u64 address, u64 size, + Kernel::Svc::MemoryPermission permission) { + auto& page_table = process->GetPageTable(); + + // Set permission. + R_RETURN(page_table.SetProcessMemoryPermission(address, size, permission)); +} + +Result UnmapProcessCodeMemory(Kernel::KProcess* process, u64 process_code_address, + const ProcessMemoryRegion* regions, size_t num_regions) { + // Get the total process memory region size. + const size_t total_size = GetTotalProcessMemoryRegionSize(regions, num_regions); + + auto& page_table = process->GetPageTable(); + + // Unmap each region in order. + size_t cur_offset = total_size; + for (size_t i = 0; i < num_regions; ++i) { + // We want to unmap in reverse order. + const auto& cur_region = regions[num_regions - 1 - i]; + + // Subtract to update the current offset. + cur_offset -= cur_region.size; + + // Unmap. + R_TRY(page_table.UnmapCodeMemory(process_code_address + cur_offset, cur_region.address, + cur_region.size)); + } + + R_SUCCEED(); +} + +Result EnsureGuardPages(Kernel::KProcessPageTable& page_table, u64 map_address, u64 map_size) { + Kernel::KMemoryInfo memory_info; + Kernel::Svc::PageInfo page_info; + + // Ensure page before mapping is unmapped. + R_TRY(page_table.QueryInfo(std::addressof(memory_info), std::addressof(page_info), + map_address - 1)); + R_UNLESS(memory_info.GetSvcState() == Kernel::Svc::MemoryState::Free, + Kernel::ResultInvalidState); + + // Ensure page after mapping is unmapped. + R_TRY(page_table.QueryInfo(std::addressof(memory_info), std::addressof(page_info), + map_address + map_size)); + R_UNLESS(memory_info.GetSvcState() == Kernel::Svc::MemoryState::Free, + Kernel::ResultInvalidState); + + // Successfully verified guard pages. + R_SUCCEED(); +} + +Result MapProcessCodeMemory(u64* out, Kernel::KProcess* process, const ProcessMemoryRegion* regions, + size_t num_regions, std::mt19937_64& generate_random) { + auto& page_table = process->GetPageTable(); + const u64 alias_code_start = + GetInteger(page_table.GetAliasCodeRegionStart()) / Kernel::PageSize; + const u64 alias_code_size = page_table.GetAliasCodeRegionSize() / Kernel::PageSize; + + for (size_t trial = 0; trial < 64; trial++) { + // Generate a new trial address. + const u64 mapped_address = + (alias_code_start + (generate_random() % alias_code_size)) * Kernel::PageSize; + + const auto MapRegions = [&] { + // Map the regions in order. + u64 mapped_size = 0; + for (size_t i = 0; i < num_regions; ++i) { + // If we fail, unmap up to where we've mapped. + ON_RESULT_FAILURE { + R_ASSERT(UnmapProcessCodeMemory(process, mapped_address, regions, i)); + }; + + // Map the current region. + R_TRY(page_table.MapCodeMemory(mapped_address + mapped_size, regions[i].address, + regions[i].size)); + + mapped_size += regions[i].size; + } + + // If we fail, unmap all mapped regions. + ON_RESULT_FAILURE { + R_ASSERT(UnmapProcessCodeMemory(process, mapped_address, regions, num_regions)); + }; + + // Ensure guard pages. + R_RETURN(EnsureGuardPages(page_table, mapped_address, mapped_size)); + }; + + if (R_SUCCEEDED(MapRegions())) { + // Set the output address. + *out = mapped_address; + R_SUCCEED(); + } + } + + // We failed to map anything. + R_THROW(RO::ResultOutOfAddressSpace); +} + +} // namespace + +Result MapNro(u64* out_base_address, Kernel::KProcess* process, u64 nro_heap_address, + u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size, + std::mt19937_64& generate_random) { + // Set up the process memory regions. + std::array<ProcessMemoryRegion, 2> regions{}; + const size_t num_regions = SetupNroProcessMemoryRegions( + regions.data(), nro_heap_address, nro_heap_size, bss_heap_address, bss_heap_size); + + // Re-map the nro/bss as code memory in the destination process. + R_RETURN(MapProcessCodeMemory(out_base_address, process, regions.data(), num_regions, + generate_random)); +} + +Result SetNroPerms(Kernel::KProcess* process, u64 base_address, u64 rx_size, u64 ro_size, + u64 rw_size) { + const u64 rx_offset = 0; + const u64 ro_offset = rx_offset + rx_size; + const u64 rw_offset = ro_offset + ro_size; + + R_TRY(SetProcessMemoryPermission(process, base_address + rx_offset, rx_size, + Kernel::Svc::MemoryPermission::ReadExecute)); + R_TRY(SetProcessMemoryPermission(process, base_address + ro_offset, ro_size, + Kernel::Svc::MemoryPermission::Read)); + R_TRY(SetProcessMemoryPermission(process, base_address + rw_offset, rw_size, + Kernel::Svc::MemoryPermission::ReadWrite)); + + R_SUCCEED(); +} + +Result UnmapNro(Kernel::KProcess* process, u64 base_address, u64 nro_heap_address, + u64 nro_heap_size, u64 bss_heap_address, u64 bss_heap_size) { + // Set up the process memory regions. + std::array<ProcessMemoryRegion, 2> regions{}; + const size_t num_regions = SetupNroProcessMemoryRegions( + regions.data(), nro_heap_address, nro_heap_size, bss_heap_address, bss_heap_size); + + // Unmap the nro/bss. + R_RETURN(UnmapProcessCodeMemory(process, base_address, regions.data(), num_regions)); +} + +} // namespace Service::RO |