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[NTOS:MM] Unconditionally delete the PFN in MiDeletePte when PTE is in transition

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When we will have a modified page writer, it will have to know if the written
page is stale when being done, and act accordingly.

CORE-8552
This commit is contained in:
Jérôme Gardou 2021-03-22 09:46:06 +01:00 committed by Jérôme Gardou
parent 82dd1afe33
commit f9ea58dc97
1 changed files with 14 additions and 2 deletions
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16
ntoskrnl/mm/ARM3/virtual.c
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@ -401,6 +401,12 @@ MiDeletePte(IN PMMPTE PointerPte,
/* PFN lock must be held */
MI_ASSERT_PFN_LOCK_HELD();
/* WorkingSet must be exclusively locked */
ASSERT(MM_ANY_WS_LOCK_HELD_EXCLUSIVE(PsGetCurrentThread()));
/* This must be current process. */
ASSERT(CurrentProcess == PsGetCurrentProcess());
/* Capture the PTE */
TempPte = *PointerPte;
@ -428,9 +434,16 @@ MiDeletePte(IN PMMPTE PointerPte,
/* Drop the reference on the page table. */
MiDecrementShareCount(MiGetPfnEntry(Pfn1->u4.PteFrame), Pfn1->u4.PteFrame);
/* In case of shared page, the prototype PTE must be in transition, not the process one */
ASSERT(Pfn1->u3.e1.PrototypePte == 0);
/* Make the page free. For prototypes, it will be made free when deleting the section object */
/* Delete the PFN */
MI_SET_PFN_DELETED(Pfn1);
/* It must be either free (refcount == 0) or being written (refcount == 1) */
ASSERT(Pfn1->u3.e2.ReferenceCount == Pfn1->u3.e1.WriteInProgress);
/* See if we must free it ourselves, or if it will be freed once I/O is over */
if (Pfn1->u3.e2.ReferenceCount == 0)
{
/* And it should be in standby or modified list */
@ -441,7 +454,6 @@ MiDeletePte(IN PMMPTE PointerPte,
Pfn1->u3.e2.ReferenceCount++;
/* This will put it back in free list and clean properly up */
MI_SET_PFN_DELETED(Pfn1);
MiDecrementReferenceCount(Pfn1, PageFrameIndex);
}
return;