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-rw-r--r--src/core/hle/kernel/shared_memory.cpp27
1 files changed, 12 insertions, 15 deletions
diff --git a/src/core/hle/kernel/shared_memory.cpp b/src/core/hle/kernel/shared_memory.cpp
index 02d5a7a36..d45daca35 100644
--- a/src/core/hle/kernel/shared_memory.cpp
+++ b/src/core/hle/kernel/shared_memory.cpp
@@ -55,22 +55,19 @@ SharedPtr<SharedMemory> SharedMemory::Create(SharedPtr<Process> owner_process, u
Kernel::g_current_process->vm_manager.RefreshMemoryBlockMappings(linheap_memory.get());
}
} else {
- // TODO(Subv): What happens if an application tries to create multiple memory blocks
- // pointing to the same address?
auto& vm_manager = shared_memory->owner_process->vm_manager;
// The memory is already available and mapped in the owner process.
- auto vma = vm_manager.FindVMA(address)->second;
- // Copy it over to our own storage
- shared_memory->backing_block = std::make_shared<std::vector<u8>>(
- vma.backing_block->data() + vma.offset, vma.backing_block->data() + vma.offset + size);
- shared_memory->backing_block_offset = 0;
- // Unmap the existing pages
- vm_manager.UnmapRange(address, size);
- // Map our own block into the address space
- vm_manager.MapMemoryBlock(address, shared_memory->backing_block, 0, size,
- MemoryState::Shared);
- // Reprotect the block with the new permissions
- vm_manager.ReprotectRange(address, size, ConvertPermissions(permissions));
+ 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->base_address = address;
@@ -184,4 +181,4 @@ u8* SharedMemory::GetPointer(u32 offset) {
return backing_block->data() + backing_block_offset + offset;
}
-} // namespace
+} // namespace Kernel