diff options
Diffstat (limited to '')
-rw-r--r-- | src/core/hle/kernel/k_page_table.cpp | 111 |
1 files changed, 100 insertions, 11 deletions
diff --git a/src/core/hle/kernel/k_page_table.cpp b/src/core/hle/kernel/k_page_table.cpp index b38ef333b..68867a2bb 100644 --- a/src/core/hle/kernel/k_page_table.cpp +++ b/src/core/hle/kernel/k_page_table.cpp @@ -542,6 +542,95 @@ ResultCode KPageTable::MakePageGroup(KPageLinkedList& pg, VAddr addr, size_t num return ResultSuccess; } +bool KPageTable::IsValidPageGroup(const KPageLinkedList& pg_ll, VAddr addr, size_t num_pages) { + ASSERT(this->IsLockedByCurrentThread()); + + const size_t size = num_pages * PageSize; + const auto& pg = pg_ll.Nodes(); + const auto& memory_layout = system.Kernel().MemoryLayout(); + + // Empty groups are necessarily invalid. + if (pg.empty()) { + return false; + } + + // We're going to validate that the group we'd expect is the group we see. + auto cur_it = pg.begin(); + PAddr cur_block_address = cur_it->GetAddress(); + size_t cur_block_pages = cur_it->GetNumPages(); + + auto UpdateCurrentIterator = [&]() { + if (cur_block_pages == 0) { + if ((++cur_it) == pg.end()) { + return false; + } + + cur_block_address = cur_it->GetAddress(); + cur_block_pages = cur_it->GetNumPages(); + } + return true; + }; + + // Begin traversal. + Common::PageTable::TraversalContext context; + Common::PageTable::TraversalEntry next_entry; + if (!page_table_impl.BeginTraversal(next_entry, context, addr)) { + return false; + } + + // Prepare tracking variables. + PAddr cur_addr = next_entry.phys_addr; + size_t cur_size = next_entry.block_size - (cur_addr & (next_entry.block_size - 1)); + size_t tot_size = cur_size; + + // Iterate, comparing expected to actual. + while (tot_size < size) { + if (!page_table_impl.ContinueTraversal(next_entry, context)) { + return false; + } + + if (next_entry.phys_addr != (cur_addr + cur_size)) { + const size_t cur_pages = cur_size / PageSize; + + if (!IsHeapPhysicalAddress(memory_layout, cur_addr)) { + return false; + } + + if (!UpdateCurrentIterator()) { + return false; + } + + if (cur_block_address != cur_addr || cur_block_pages < cur_pages) { + return false; + } + + cur_block_address += cur_size; + cur_block_pages -= cur_pages; + cur_addr = next_entry.phys_addr; + cur_size = next_entry.block_size; + } else { + cur_size += next_entry.block_size; + } + + tot_size += next_entry.block_size; + } + + // Ensure we compare the right amount for the last block. + if (tot_size > size) { + cur_size -= (tot_size - size); + } + + if (!IsHeapPhysicalAddress(memory_layout, cur_addr)) { + return false; + } + + if (!UpdateCurrentIterator()) { + return false; + } + + return cur_block_address == cur_addr && cur_block_pages == (cur_size / PageSize); +} + ResultCode KPageTable::UnmapProcessMemory(VAddr dst_addr, std::size_t size, KPageTable& src_page_table, VAddr src_addr) { KScopedLightLock lk(general_lock); @@ -1687,22 +1776,22 @@ ResultCode KPageTable::UnlockForDeviceAddressSpace(VAddr addr, std::size_t size) return ResultSuccess; } -ResultCode KPageTable::LockForCodeMemory(VAddr addr, std::size_t size) { +ResultCode KPageTable::LockForCodeMemory(KPageLinkedList* out, VAddr addr, std::size_t size) { return this->LockMemoryAndOpen( - nullptr, nullptr, addr, size, KMemoryState::FlagCanCodeMemory, - KMemoryState::FlagCanCodeMemory, KMemoryPermission::All, KMemoryPermission::UserReadWrite, - KMemoryAttribute::All, KMemoryAttribute::None, + out, nullptr, addr, size, KMemoryState::FlagCanCodeMemory, KMemoryState::FlagCanCodeMemory, + KMemoryPermission::All, KMemoryPermission::UserReadWrite, KMemoryAttribute::All, + KMemoryAttribute::None, static_cast<KMemoryPermission>(KMemoryPermission::NotMapped | KMemoryPermission::KernelReadWrite), KMemoryAttribute::Locked); } -ResultCode KPageTable::UnlockForCodeMemory(VAddr addr, std::size_t size) { - return this->UnlockMemory(addr, size, KMemoryState::FlagCanCodeMemory, - KMemoryState::FlagCanCodeMemory, KMemoryPermission::None, - KMemoryPermission::None, KMemoryAttribute::All, - KMemoryAttribute::Locked, KMemoryPermission::UserReadWrite, - KMemoryAttribute::Locked, nullptr); +ResultCode KPageTable::UnlockForCodeMemory(VAddr addr, std::size_t size, + const KPageLinkedList& pg) { + return this->UnlockMemory( + addr, size, KMemoryState::FlagCanCodeMemory, KMemoryState::FlagCanCodeMemory, + KMemoryPermission::None, KMemoryPermission::None, KMemoryAttribute::All, + KMemoryAttribute::Locked, KMemoryPermission::UserReadWrite, KMemoryAttribute::Locked, &pg); } ResultCode KPageTable::InitializeMemoryLayout(VAddr start, VAddr end) { @@ -2125,7 +2214,7 @@ ResultCode KPageTable::UnlockMemory(VAddr addr, size_t size, KMemoryState state_ // Check the page group. if (pg != nullptr) { - UNIMPLEMENTED_MSG("PageGroup support is unimplemented!"); + R_UNLESS(this->IsValidPageGroup(*pg, addr, num_pages), ResultInvalidMemoryRegion); } // Decide on new perm and attr. |