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Kernel: Fix 64-bit address truncation in MemoryManager::ensure_pte()

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This commit is contained in:
Gunnar Beutner 2021-07-18 02:34:57 +02:00 • committed by Andreas Kling
parent ed25a6ad0d
commit f0c4941beb
2 changed files with 3 additions and 2 deletions
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3
Kernel/VM/MemoryManager.cpp
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@ -552,7 +552,8 @@ PageTableEntry* MemoryManager::ensure_pte(PageDirectory& page_directory, Virtual
pde.set_global(&page_directory == m_kernel_page_directory.ptr());
// Use page_directory_table_index and page_directory_index as key
// This allows us to release the page table entry when no longer needed
auto result = page_directory.m_page_tables.set(vaddr.get() & ~0x1fffff, move(page_table));
auto result = page_directory.m_page_tables.set(vaddr.get() & ~(FlatPtr)0x1fffff, move(page_table));
// If you're hitting this VERIFY on x86_64 chances are a 64-bit pointer was truncated somewhere
VERIFY(result == AK::HashSetResult::InsertedNewEntry);
}