Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-06-13 21:38:33 +00:00
Code Issues Projects Releases Packages Wiki Activity

[NTOSKRNL]: Drop the reference on the PDE for kernel stack pages being deleted, now that zekflop has made all PDEs ARM3-owned.

Browse source 
svn path=/trunk/; revision=55882
This commit is contained in:
Alex Ionescu 2012-02-27 16:10:30 +00:00
parent 270acce7b4
commit 2c7855ed9d
1 changed files with 12 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

25
reactos/ntoskrnl/mm/ARM3/procsup.c
View file

@ -201,7 +201,7 @@ MmDeleteTeb(IN PEPROCESS Process,
/* Delete the pages */
MiDeleteVirtualAddresses((ULONG_PTR)Teb, TebEnd, NULL);
/* Release the working set */
MiUnlockProcessWorkingSet(Process, Thread);
@ -224,7 +224,7 @@ MmDeleteKernelStack(IN PVOID StackBase,
PMMPTE PointerPte;
PFN_NUMBER PageFrameNumber, PageTableFrameNumber;
PFN_COUNT StackPages;
PMMPFN Pfn1;//, Pfn2;
PMMPFN Pfn1, Pfn2;
ULONG i;
KIRQL OldIrql;
@ -256,15 +256,14 @@ MmDeleteKernelStack(IN PVOID StackBase,
/* Get the PTE's page */
PageFrameNumber = PFN_FROM_PTE(PointerPte);
Pfn1 = MiGetPfnEntry(PageFrameNumber);
#if 1 // ARM3 might not own the page table, so don't take this risk. Leak it instead!
/* Now get the page of the page table mapping it */
PageTableFrameNumber = Pfn1->u4.PteFrame;
//Pfn2 = MiGetPfnEntry(PageTableFrameNumber);
Pfn2 = MiGetPfnEntry(PageTableFrameNumber);
/* Remove a shared reference, since the page is going away */
DPRINT("SystemPTE PDE: %lx\n", PageTableFrameNumber);
//MiDecrementShareCount(Pfn2, PageTableFrameNumber);
#endif
MiDecrementShareCount(Pfn2, PageTableFrameNumber);
/* Set the special pending delete marker */
MI_SET_PFN_DELETED(Pfn1);
@ -925,7 +924,7 @@ MiInitializeWorkingSetList(IN PEPROCESS CurrentProcess)
Pfn1 = MiGetPfnEntry(CurrentProcess->Pcb.DirectoryTableBase[0] >> PAGE_SHIFT);
ASSERT(Pfn1->u4.PteFrame == MiGetPfnEntryIndex(Pfn1));
Pfn1->u1.Event = (PKEVENT)CurrentProcess;
/* Map the process working set in kernel space */
sysPte = MiReserveSystemPtes(1, SystemPteSpace);
MI_MAKE_HARDWARE_PTE_KERNEL(&tempPte, sysPte, MM_READWRITE, CurrentProcess->WorkingSetPage);
@ -1365,7 +1364,7 @@ MmDeleteProcessAddressSpace2(IN PEPROCESS Process)
PFN_NUMBER PageFrameIndex;
//ASSERT(Process->CommitCharge == 0);
/* Acquire the PFN lock */
OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
@ -1382,7 +1381,7 @@ MmDeleteProcessAddressSpace2(IN PEPROCESS Process)
MiDecrementShareCount(Pfn1, Process->WorkingSetPage);
ASSERT((Pfn1->u3.e2.ReferenceCount == 0) || (Pfn1->u3.e1.WriteInProgress));
MiReleaseSystemPtes(MiAddressToPte(Process->Vm.VmWorkingSetList), 1, SystemPteSpace);
/* Now map hyperspace and its page table */
PageFrameIndex = Process->Pcb.DirectoryTableBase[1] >> PAGE_SHIFT;
Pfn1 = MiGetPfnEntry(PageFrameIndex);
@ -1393,14 +1392,14 @@ MmDeleteProcessAddressSpace2(IN PEPROCESS Process)
MiDecrementShareCount(Pfn2, Pfn1->u4.PteFrame);
MiDecrementShareCount(Pfn1, PageFrameIndex);
ASSERT((Pfn1->u3.e2.ReferenceCount == 0) || (Pfn1->u3.e1.WriteInProgress));
/* Finally, nuke the PDE itself */
PageFrameIndex = Process->Pcb.DirectoryTableBase[0] >> PAGE_SHIFT;
Pfn1 = MiGetPfnEntry(PageFrameIndex);
MI_SET_PFN_DELETED(Pfn1);
MiDecrementShareCount(Pfn1, PageFrameIndex);
MiDecrementShareCount(Pfn1, PageFrameIndex);
/* Page table is now dead. Bye bye... */
ASSERT((Pfn1->u3.e2.ReferenceCount == 0) || (Pfn1->u3.e1.WriteInProgress));
}
@ -1415,7 +1414,7 @@ MmDeleteProcessAddressSpace2(IN PEPROCESS Process)
/* No support for sessions yet */
ASSERT(Process->Session == 0);
/* Clear out the PDE pages */
Process->Pcb.DirectoryTableBase[0] = 0;
Process->Pcb.DirectoryTableBase[1] = 0;