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[NTOS:MM] Allow "creating" a PDE in legacy Mm for foreign process

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This commit is contained in:
Jérôme Gardou 2021-01-22 09:31:34 +01:00
parent af3527d4d2
commit 57e8684bc6
1 changed files with 25 additions and 10 deletions
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35
ntoskrnl/mm/i386/page.c
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@ -219,10 +219,6 @@ MmGetPageTableForProcess(PEPROCESS Process, PVOID Address, BOOLEAN Create)
PMMPDE PdeBase;
ULONG PdeOffset = MiGetPdeOffset(Address);
/* Nobody but page fault should ask for creating the PDE,
* Which imples that Process is the current one */
ASSERT(Create == FALSE);
PdeBase = MmCreateHyperspaceMapping(PTE_TO_PFN(Process->Pcb.DirectoryTableBase[0]));
if (PdeBase == NULL)
{
@ -231,13 +227,32 @@ MmGetPageTableForProcess(PEPROCESS Process, PVOID Address, BOOLEAN Create)
PointerPde = PdeBase + PdeOffset;
if (PointerPde->u.Hard.Valid == 0)
{
MmDeleteHyperspaceMapping(PdeBase);
return NULL;
}
else
{
Pfn = PointerPde->u.Hard.PageFrameNumber;
KAPC_STATE ApcState;
NTSTATUS Status;
if (!Create)
{
MmDeleteHyperspaceMapping(PdeBase);
return NULL;
}
KeStackAttachProcess(&Process->Pcb, &ApcState);
Status = MiDispatchFault(0x1,
MiAddressToPte(Address),
MiAddressToPde(Address),
NULL,
FALSE,
Process,
NULL,
NULL);
KeUnstackDetachProcess(&ApcState);
if (!NT_SUCCESS(Status))
return NULL;
}
Pfn = PointerPde->u.Hard.PageFrameNumber;
MmDeleteHyperspaceMapping(PdeBase);
Pt = MmCreateHyperspaceMapping(Pfn);
if (Pt == NULL)