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Fix PTE free list sentinel handling
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This commit is contained in:
Aiken Harris
2025-12-22 15:00:14 +01:00
parent 6aa148784b
commit 643fd0d1e8
1 changed files with 4 additions and 4 deletions
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8
xtoskrnl/mm/i686/pagemap.cc
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@@ -226,8 +226,8 @@ XTAPI
ULONG_PTR ULONG_PTR
MM::PageMapBasic::GetNextEntry(IN PMMPTE Pte) MM::PageMapBasic::GetNextEntry(IN PMMPTE Pte)
{ {
/* Return next entry in PTE list */ /* Return next entry in PTE list, translating the hardware limit (0xFFFFF) to the logical sentinel (MAXULONG) */
return Pte->Pml2.List.NextEntry; return (Pte->Pml2.List.NextEntry == 0xFFFFF) ? MAXULONG : Pte->Pml2.List.NextEntry;
} }
/** /**
@@ -435,8 +435,8 @@ VOID
MM::PageMapBasic::SetNextEntry(IN PMMPTE Pte, MM::PageMapBasic::SetNextEntry(IN PMMPTE Pte,
IN ULONG_PTR Value) IN ULONG_PTR Value)
{ {
/* Set next entry in PTE list */ /* Set next entry in PTE list, translating the logical sentinel (MAXULONG) to the 20-bit hardware limit (0xFFFFF) */
Pte->Pml2.List.NextEntry = Value; Pte->Pml2.List.NextEntry = (Value == MAXULONG) ? 0xFFFFF : Value;
} }
/** /**