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Kernel: Only use uncommitted pages when allocating contiguous user pages

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Idan Horowitz 2022-06-05 22:52:01 +03:00
parent b558d899ea
commit 427f1f7e31
Notes: sideshowbarker 2024-07-17 10:26:12 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/427f1f7e31
Pull-request: https://github.com/SerenityOS/serenity/pull/14198
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/linusg ✅
1 changed files with 5 additions and 0 deletions
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5
Kernel/Memory/MemoryManager.cpp
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@ -978,6 +978,10 @@ ErrorOr<NonnullRefPtrVector<PhysicalPage>> MemoryManager::allocate_contiguous_us
SpinlockLocker lock(s_mm_lock);
size_t page_count = ceil_div(size, static_cast<size_t>(PAGE_SIZE));
// We need to make sure we don't touch pages that we have committed to
if (m_system_memory_info.user_physical_pages_uncommitted < page_count)
return ENOMEM;
for (auto& physical_region : m_user_physical_regions) {
auto physical_pages = physical_region.take_contiguous_free_pages(page_count);
if (!physical_pages.is_empty()) {
@ -985,6 +989,7 @@ ErrorOr<NonnullRefPtrVector<PhysicalPage>> MemoryManager::allocate_contiguous_us
auto cleanup_region = TRY(MM.allocate_kernel_region(physical_pages[0].paddr(), PAGE_SIZE * page_count, "MemoryManager Allocation Sanitization", Region::Access::Read | Region::Access::Write));
memset(cleanup_region->vaddr().as_ptr(), 0, PAGE_SIZE * page_count);
}
m_system_memory_info.user_physical_pages_uncommitted -= page_count;
m_system_memory_info.user_physical_pages_used += page_count;
return physical_pages;
}