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Kernel: Assert if rounding-up-to-page-size would wrap around to 0

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If we try to align a number above 0xfffff000 to the next multiple of
the page size (4 KiB), it would wrap around to 0. This is most likely
never what we want, so let's assert if that happens.
This commit is contained in:
Andreas Kling 2021-02-14 09:57:19 +01:00
commit 09b1b09c19
Notes: sideshowbarker 2024-07-18 22:20:22 +09:00
19 changed files with 67 additions and 40 deletions
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4
Kernel/VM/Space.cpp
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@ -57,7 +57,7 @@ Space::~Space()
Optional<Range> Space::allocate_range(VirtualAddress vaddr, size_t size, size_t alignment)
{
vaddr.mask(PAGE_MASK);
size = PAGE_ROUND_UP(size);
size = page_round_up(size);
if (vaddr.is_null())
return page_directory().range_allocator().allocate_anywhere(size, alignment);
return page_directory().range_allocator().allocate_specific(vaddr, size);
@ -137,7 +137,7 @@ Region* Space::find_region_from_range(const Range& range)
if (m_region_lookup_cache.range.has_value() && m_region_lookup_cache.range.value() == range && m_region_lookup_cache.region)
return m_region_lookup_cache.region.unsafe_ptr();
size_t size = PAGE_ROUND_UP(range.size());
size_t size = page_round_up(range.size());
for (auto& region : m_regions) {
if (region.vaddr() == range.base() && region.size() == size) {
m_region_lookup_cache.range = range;