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Limit system PTE space mapping to calculated pool size
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This commit is contained in:
Aiken Harris
2026-01-27 16:56:40 +01:00
parent a4b9f495e5
commit 446ce920ec
1 changed files with 7 additions and 2 deletions
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9
xtoskrnl/mm/pte.cc
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@@ -194,16 +194,21 @@ MM::Pte::InitializeSystemPteSpace(VOID)
PMMPTE PointerPte;
PMMPTE FirstZeroingPte;
PMMMEMORY_LAYOUT MemoryLayout;
ULONGLONG NonPagedSystemPoolEnd;
/* Retrieve the system's memory layout */
MemoryLayout = MM::Manager::GetMemoryLayout();
NonPagedSystemPoolEnd = ((ULONGLONG)MemoryLayout->SystemSpaceStart +
MM::Manager::GetNumberOfSystemPtes() * MM_PAGE_SIZE);
/* Map the page table hierarchy for the entire system PTE space */
MM::Pte::MapPPE(MemoryLayout->SystemSpaceStart, MemoryLayout->SystemSpaceEnd, &ValidPte);
MM::Pte::MapPDE(MemoryLayout->SystemSpaceStart, MemoryLayout->SystemSpaceEnd, &ValidPte);
MM::Pte::MapPPE(MemoryLayout->SystemSpaceStart, (PVOID)NonPagedSystemPoolEnd, &ValidPte);
MM::Pte::MapPDE(MemoryLayout->SystemSpaceStart, (PVOID)NonPagedSystemPoolEnd, &ValidPte);
/* Format the main block of system PTEs into a free list pool */
PointerPte = MM::Paging::GetPteAddress(MemoryLayout->SystemSpaceStart);
InitializeSystemPtePool(PointerPte, MM::Manager::GetNumberOfSystemPtes(), SystemPteSpace);
/* Reserve and zero a dedicated block of system PTEs */