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[NTOS] Implement MiIsPageTablePresent as a replacement for the abused MiQueryPageTableReferences

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This commit is contained in:
Timo Kreuzer 2019-12-26 20:30:54 +01:00 committed by Jérôme Gardou
parent 678923bf4b
commit 6a2eeaa5ae
2 changed files with 77 additions and 52 deletions
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46
ntoskrnl/mm/ARM3/miarm.h
View file

@ -2549,57 +2549,13 @@ USHORT
MiQueryPageTableReferences(IN PVOID Address)
{
PMMPDE PointerPde;
PMMPPE PointerPpe;
#if _MI_PAGING_LEVELS == 4
PMMPXE PointerPxe;
#endif
PMMPFN Pfn;
/* Make sure we're locked */
ASSERT((PsGetCurrentThread()->OwnsProcessWorkingSetExclusive) || (PsGetCurrentThread()->OwnsProcessWorkingSetShared));
/* Check if PXE or PPE have references first. */
#if _MI_PAGING_LEVELS == 4
PointerPxe = MiAddressToPxe(Address);
if ((PointerPxe->u.Hard.Valid == 1) || (PointerPxe->u.Soft.Transition == 1))
{
Pfn = MiGetPfnEntry(PFN_FROM_PXE(PointerPxe));
if (Pfn->OriginalPte.u.Soft.UsedPageTableEntries == 0)
return 0;
}
else if (PointerPxe->u.Soft.UsedPageTableEntries == 0)
{
return 0;
}
if (PointerPxe->u.Hard.Valid == 0)
{
MiMakeSystemAddressValid(MiPteToAddress(PointerPxe), PsGetCurrentProcess());
}
#endif
PointerPpe = MiAddressToPpe(Address);
if ((PointerPpe->u.Hard.Valid == 1) || (PointerPpe->u.Soft.Transition == 1))
{
Pfn = MiGetPfnEntry(PFN_FROM_PPE(PointerPpe));
if (Pfn->OriginalPte.u.Soft.UsedPageTableEntries == 0)
return 0;
}
else if (PointerPpe->u.Soft.UsedPageTableEntries == 0)
{
return 0;
}
if (PointerPpe->u.Hard.Valid == 0)
{
MiMakeSystemAddressValid(MiPteToAddress(PointerPpe), PsGetCurrentProcess());
}
PointerPde = MiAddressToPde(Address);
if ((PointerPde->u.Hard.Valid == 0) && (PointerPde->u.Soft.Transition == 0))
{
return PointerPde->u.Soft.UsedPageTableEntries;
}
ASSERT(PointerPde->u.Hard.Valid);
/* This lies on the PFN */
Pfn = MiGetPfnEntry(PFN_FROM_PDE(PointerPde));

83
ntoskrnl/mm/i386/page.c
View file

@ -114,6 +114,75 @@ NTAPI
MiFillSystemPageDirectory(IN PVOID Base,
IN SIZE_T NumberOfBytes);
static
BOOLEAN
MiIsPageTablePresent(PVOID Address)
{
#if _MI_PAGING_LEVELS == 2
return MiQueryPageTableReferences(Address) != 0;
#else
PMMPDE PointerPde;
PMMPPE PointerPpe;
#if _MI_PAGING_LEVELS == 4
PMMPXE PointerPxe;
#endif
PMMPFN Pfn;
/* Make sure we're locked */
ASSERT((PsGetCurrentThread()->OwnsProcessWorkingSetExclusive) || (PsGetCurrentThread()->OwnsProcessWorkingSetShared));
/* Must not hold the PFN lock! */
ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
/* Check if PXE or PPE have references first. */
#if _MI_PAGING_LEVELS == 4
PointerPxe = MiAddressToPxe(Address);
if ((PointerPxe->u.Hard.Valid == 1) || (PointerPxe->u.Soft.Transition == 1))
{
Pfn = MiGetPfnEntry(PFN_FROM_PXE(PointerPxe));
if (Pfn->OriginalPte.u.Soft.UsedPageTableEntries == 0)
return FALSE;
}
else if (PointerPxe->u.Soft.UsedPageTableEntries == 0)
{
return FALSE;
}
if (PointerPxe->u.Hard.Valid == 0)
{
MiMakeSystemAddressValid(MiPteToAddress(PointerPxe), PsGetCurrentProcess());
}
#endif
PointerPpe = MiAddressToPpe(Address);
if ((PointerPpe->u.Hard.Valid == 1) || (PointerPpe->u.Soft.Transition == 1))
{
Pfn = MiGetPfnEntry(PFN_FROM_PPE(PointerPpe));
if (Pfn->OriginalPte.u.Soft.UsedPageTableEntries == 0)
return FALSE;
}
else if (PointerPpe->u.Soft.UsedPageTableEntries == 0)
{
return FALSE;
}
if (PointerPpe->u.Hard.Valid == 0)
{
MiMakeSystemAddressValid(MiPteToAddress(PointerPpe), PsGetCurrentProcess());
}
PointerPde = MiAddressToPde(Address);
if ((PointerPde->u.Hard.Valid == 0) && (PointerPde->u.Soft.Transition == 0))
{
return PointerPde->u.Soft.UsedPageTableEntries != 0;
}
/* This lies on the PFN */
Pfn = MiGetPfnEntry(PFN_FROM_PDE(PointerPde));
return Pfn->OriginalPte.u.Soft.UsedPageTableEntries != 0;
#endif
}
PFN_NUMBER
NTAPI
MmGetPfnForProcess(PEPROCESS Process,
@ -132,7 +201,7 @@ MmGetPfnForProcess(PEPROCESS Process,
/* Lock for reading */
MiLockProcessWorkingSetShared(Process, PsGetCurrentThread());
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
MiUnlockProcessWorkingSetShared(Process, PsGetCurrentThread());
return 0;
@ -201,7 +270,7 @@ MmDeleteVirtualMapping(PEPROCESS Process, PVOID Address,
MiLockProcessWorkingSetUnsafe(Process, PsGetCurrentThread());
/* No PDE --> No page */
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
MiUnlockProcessWorkingSetUnsafe(Process, PsGetCurrentThread());
if (WasDirty)
@ -332,7 +401,7 @@ MmIsPagePresent(PEPROCESS Process, PVOID Address)
MiLockProcessWorkingSetShared(Process, PsGetCurrentThread());
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
/* It can't be present if there is no PDE */
MiUnlockProcessWorkingSetShared(Process, PsGetCurrentThread());
@ -375,7 +444,7 @@ MmIsDisabledPage(PEPROCESS Process, PVOID Address)
MiLockProcessWorkingSetShared(Process, PsGetCurrentThread());
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
/* It can't be disabled if there is no PDE */
MiUnlockProcessWorkingSetShared(Process, PsGetCurrentThread());
@ -415,7 +484,7 @@ MmIsPageSwapEntry(PEPROCESS Process, PVOID Address)
MiLockProcessWorkingSetShared(Process, PsGetCurrentThread());
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
/* There can't be a swap entry if there is no PDE */
MiUnlockProcessWorkingSetShared(Process, PsGetCurrentThread());
@ -451,7 +520,7 @@ MmGetPageFileMapping(PEPROCESS Process, PVOID Address, SWAPENTRY* SwapEntry)
MiLockProcessWorkingSetShared(Process, PsGetCurrentThread());
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
/* There can't be a swap entry if there is no PDE */
MiUnlockProcessWorkingSetShared(Process, PsGetCurrentThread());
@ -638,7 +707,7 @@ MmGetPageProtect(PEPROCESS Process, PVOID Address)
MiLockProcessWorkingSetShared(Process, PsGetCurrentThread());
if (MiQueryPageTableReferences(Address) == 0)
if (!MiIsPageTablePresent(Address))
{
/* It can't be present if there is no PDE */
MiUnlockProcessWorkingSetShared(Process, PsGetCurrentThread());