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Merge pull request #917 from lioncash/crash
kernel/thread: Fix potential crashes introduced in 26de4bb5
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commit
d43dad001e
3 changed files with 36 additions and 11 deletions
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@ -28,20 +28,32 @@ SharedPtr<SharedMemory> SharedMemory::Create(SharedPtr<Process> owner_process, u
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shared_memory->permissions = permissions;
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shared_memory->other_permissions = other_permissions;
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auto& vm_manager = shared_memory->owner_process->vm_manager;
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if (address == 0) {
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shared_memory->backing_block = std::make_shared<std::vector<u8>>(size);
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shared_memory->backing_block_offset = 0;
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// The memory is already available and mapped in the owner process.
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auto vma = vm_manager.FindVMA(address);
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ASSERT_MSG(vma != vm_manager.vma_map.end(), "Invalid memory address");
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ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
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// Refresh the address mappings for the current process.
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if (Core::CurrentProcess() != nullptr) {
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Core::CurrentProcess()->vm_manager.RefreshMemoryBlockMappings(
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shared_memory->backing_block.get());
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}
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} else {
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auto& vm_manager = shared_memory->owner_process->vm_manager;
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// The returned VMA might be a bigger one encompassing the desired address.
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auto vma_offset = address - vma->first;
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ASSERT_MSG(vma_offset + size <= vma->second.size,
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"Shared memory exceeds bounds of mapped block");
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// The memory is already available and mapped in the owner process.
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auto vma = vm_manager.FindVMA(address);
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ASSERT_MSG(vma != vm_manager.vma_map.end(), "Invalid memory address");
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ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
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// The returned VMA might be a bigger one encompassing the desired address.
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auto vma_offset = address - vma->first;
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ASSERT_MSG(vma_offset + size <= vma->second.size,
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"Shared memory exceeds bounds of mapped block");
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shared_memory->backing_block = vma->second.backing_block;
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shared_memory->backing_block_offset = vma->second.offset + vma_offset;
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}
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shared_memory->backing_block = vma->second.backing_block;
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shared_memory->backing_block_offset = vma->second.offset + vma_offset;
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shared_memory->base_address = address;
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return shared_memory;
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@ -339,6 +339,17 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
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tls_slots.emplace_back(0); // The page is completely available at the start
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available_page = tls_slots.size() - 1;
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available_slot = 0; // Use the first slot in the new page
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// Allocate some memory from the end of the linear heap for this region.
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const size_t offset = thread->tls_memory->size();
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thread->tls_memory->insert(thread->tls_memory->end(), Memory::PAGE_SIZE, 0);
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auto& vm_manager = owner_process->vm_manager;
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vm_manager.RefreshMemoryBlockMappings(thread->tls_memory.get());
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vm_manager.MapMemoryBlock(Memory::TLS_AREA_VADDR + available_page * Memory::PAGE_SIZE,
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thread->tls_memory, 0, Memory::PAGE_SIZE,
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MemoryState::ThreadLocal);
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}
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// Mark the slot as used
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@ -265,6 +265,8 @@ public:
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private:
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Thread();
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~Thread() override;
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std::shared_ptr<std::vector<u8>> tls_memory = std::make_shared<std::vector<u8>>();
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};
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/**
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