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Mark PFN as deleted instead of clearing PteAddress when freeing pages
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This commit is contained in:
Aiken Harris
2026-03-25 09:51:09 +01:00
parent 33665839ad
commit 441e4f510b
1 changed files with 3 additions and 3 deletions
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6
xtoskrnl/mm/alloc.cc
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@@ -818,14 +818,14 @@ MM::Allocator::FreeNonPagedPoolPages(IN PVOID VirtualAddress,
PageFrameNumber = MM::Paging::GetPageFrameNumber(PointerPte); PageFrameNumber = MM::Paging::GetPageFrameNumber(PointerPte);
Pfn = MM::Pfn::GetPfnEntry(PageFrameNumber); Pfn = MM::Pfn::GetPfnEntry(PageFrameNumber);
/* Clear PFN shared count */ /* Clear PFN shared count and mark the PFN as deleted */
Pfn->u2.ShareCount = 0; Pfn->u2.ShareCount = 0;
Pfn->PteAddress = (PMMPTE)((ULONG_PTR)Pfn->PteAddress | 0x1);
/* Decrement the reference count of the page table */ /* Decrement the reference count of the page table */
MM::Pfn::DecrementReferenceCount(Pfn, PageFrameNumber, FALSE); MM::Pfn::DecrementReferenceCount(Pfn, PageFrameNumber, FALSE);
/* Clear the PTE address and invalidate the PTE */ /* Invalidate the PTE */
Pfn->PteAddress = NULLPTR;
MM::Paging::ClearPte(PointerPte); MM::Paging::ClearPte(PointerPte);
/* Get the next PTE */ /* Get the next PTE */