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kernel/thread: Fix potential crashes introduced in 26de4bb521

This amends cases where crashes can occur that were missed due to the
odd way the previous code was set up (using 3DS memory regions that
don't exist).
This commit is contained in:
Lioncash 2018-08-03 20:45:39 -04:00
parent 40e63ede6d
commit e93fa7f2cc
3 changed files with 36 additions and 11 deletions

View file

@ -28,20 +28,32 @@ SharedPtr<SharedMemory> SharedMemory::Create(SharedPtr<Process> owner_process, u
shared_memory->permissions = permissions;
shared_memory->other_permissions = other_permissions;
auto& vm_manager = shared_memory->owner_process->vm_manager;
if (address == 0) {
shared_memory->backing_block = std::make_shared<std::vector<u8>>(size);
shared_memory->backing_block_offset = 0;
// The memory is already available and mapped in the owner process.
auto vma = vm_manager.FindVMA(address);
ASSERT_MSG(vma != vm_manager.vma_map.end(), "Invalid memory address");
ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
// Refresh the address mappings for the current process.
if (Core::CurrentProcess() != nullptr) {
Core::CurrentProcess()->vm_manager.RefreshMemoryBlockMappings(
shared_memory->backing_block.get());
}
} else {
auto& vm_manager = shared_memory->owner_process->vm_manager;
// The returned VMA might be a bigger one encompassing the desired address.
auto vma_offset = address - vma->first;
ASSERT_MSG(vma_offset + size <= vma->second.size,
"Shared memory exceeds bounds of mapped block");
// The memory is already available and mapped in the owner process.
auto vma = vm_manager.FindVMA(address);
ASSERT_MSG(vma != vm_manager.vma_map.end(), "Invalid memory address");
ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
// The returned VMA might be a bigger one encompassing the desired address.
auto vma_offset = address - vma->first;
ASSERT_MSG(vma_offset + size <= vma->second.size,
"Shared memory exceeds bounds of mapped block");
shared_memory->backing_block = vma->second.backing_block;
shared_memory->backing_block_offset = vma->second.offset + vma_offset;
}
shared_memory->backing_block = vma->second.backing_block;
shared_memory->backing_block_offset = vma->second.offset + vma_offset;
shared_memory->base_address = address;
return shared_memory;

View file

@ -339,6 +339,17 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
tls_slots.emplace_back(0); // The page is completely available at the start
available_page = tls_slots.size() - 1;
available_slot = 0; // Use the first slot in the new page
// Allocate some memory from the end of the linear heap for this region.
const size_t offset = thread->tls_memory->size();
thread->tls_memory->insert(thread->tls_memory->end(), Memory::PAGE_SIZE, 0);
auto& vm_manager = owner_process->vm_manager;
vm_manager.RefreshMemoryBlockMappings(thread->tls_memory.get());
vm_manager.MapMemoryBlock(Memory::TLS_AREA_VADDR + available_page * Memory::PAGE_SIZE,
thread->tls_memory, 0, Memory::PAGE_SIZE,
MemoryState::ThreadLocal);
}
// Mark the slot as used

View file

@ -265,6 +265,8 @@ public:
private:
Thread();
~Thread() override;
std::shared_ptr<std::vector<u8>> tls_memory = std::make_shared<std::vector<u8>>();
};
/**