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Kernel: Refuse to allocate 0 bytes of virtual address space
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1 changed files with 6 additions and 0 deletions
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@ -96,6 +96,9 @@ void RangeAllocator::carve_at_index(int index, const Range& range)
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Range RangeAllocator::allocate_anywhere(size_t size, size_t alignment)
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{
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if (!size)
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return {};
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#ifdef VM_GUARD_PAGES
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// NOTE: We pad VM allocations with a guard page on each side.
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size_t effective_size = size + PAGE_SIZE * 2;
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@ -135,6 +138,9 @@ Range RangeAllocator::allocate_anywhere(size_t size, size_t alignment)
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Range RangeAllocator::allocate_specific(VirtualAddress base, size_t size)
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{
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if (!size)
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return {};
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Range allocated_range(base, size);
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for (int i = 0; i < m_available_ranges.size(); ++i) {
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auto& available_range = m_available_ranges[i];
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