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Kernel: Refuse to allocate 0 bytes of virtual address space

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This commit is contained in:
Andreas Kling 2020-02-19 22:19:55 +01:00
parent 26fb3f7269
commit a87544fe8b
1 changed files with 6 additions and 0 deletions
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6
Kernel/VM/RangeAllocator.cpp
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@ -96,6 +96,9 @@ void RangeAllocator::carve_at_index(int index, const Range& range)
Range RangeAllocator::allocate_anywhere(size_t size, size_t alignment) Range RangeAllocator::allocate_anywhere(size_t size, size_t alignment)
{ {
if (!size)
return {};
#ifdef VM_GUARD_PAGES #ifdef VM_GUARD_PAGES
// NOTE: We pad VM allocations with a guard page on each side. // NOTE: We pad VM allocations with a guard page on each side.
size_t effective_size = size + PAGE_SIZE * 2; size_t effective_size = size + PAGE_SIZE * 2;
@ -135,6 +138,9 @@ Range RangeAllocator::allocate_anywhere(size_t size, size_t alignment)
Range RangeAllocator::allocate_specific(VirtualAddress base, size_t size) Range RangeAllocator::allocate_specific(VirtualAddress base, size_t size)
{ {
if (!size)
return {};
Range allocated_range(base, size); Range allocated_range(base, size);
for (int i = 0; i < m_available_ranges.size(); ++i) { for (int i = 0; i < m_available_ranges.size(); ++i) {
auto& available_range = m_available_ranges[i]; auto& available_range = m_available_ranges[i];