[jgardou] 54477: [NTOSKRNL/MM] - create a page op when changing page protection attribute - properly handle PAGE_NOACCESS protection change in NtProtectVirtualMemory - Round down the address we're ...
22 Nov
2011
22 Nov
'11
10:01 p.m.
Author: jgardou
Date: Tue Nov 22 22:01:06 2011
New Revision: 54477
URL: http://svn.reactos.org/svn/reactos?rev=54477&view=rev
Log:
[NTOSKRNL/MM]
- create a page op when changing page protection attribute
- properly handle PAGE_NOACCESS protection change in NtProtectVirtualMemory
- Round down the address we're given when creating a page op, so we're sure there
is o,ly one page op for running for one page
- Add a small hack
Now ReatOS boots with DPH enabled on low memory conditions
Modified:
trunk/reactos/ntoskrnl/mm/anonmem.c
trunk/reactos/ntoskrnl/mm/i386/page.c
trunk/reactos/ntoskrnl/mm/pageop.c
Modified: trunk/reactos/ntoskrnl/mm/anonmem.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/anonmem.c?rev=…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/anonmem.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/anonmem.c [iso-8859-1] Tue Nov 22 22:01:06 2011
@@ -420,16 +420,42 @@
OldProtect != NewProtect)
{
ULONG i;
+ PMM_PAGEOP PageOp;
+ PMEMORY_AREA MArea;
+ char* addr = (char*)BaseAddress;
for (i=0; i < PAGE_ROUND_UP(RegionSize)/PAGE_SIZE; i++)
{
- if (MmIsPagePresent(Process,
- (char*)BaseAddress + (i*PAGE_SIZE)))
+ MArea = MmLocateMemoryAreaByAddress(AddressSpace, addr);
+ do
{
- MmSetPageProtect(Process,
- (char*)BaseAddress + (i*PAGE_SIZE),
- NewProtect);
+ PageOp = MmGetPageOp(MArea, Process->UniqueProcessId, addr,
+ NULL, 0, MM_PAGEOP_CHANGEPROTECT, TRUE);
+ } while(PageOp == NULL);
+
+ /* Should we enable/disable virtual mapping? */
+ if((NewProtect & PAGE_NOACCESS) &&
+ !(OldProtect & PAGE_NOACCESS) &&
+ (MmIsPagePresent(Process, addr)))
+ {
+ /* Set other flags if any */
+ if(NewProtect != PAGE_NOACCESS)
+ MmSetPageProtect(Process, addr, NewProtect & ~PAGE_NOACCESS);
+ MmDisableVirtualMapping(Process, addr, NULL, NULL);
}
+ else if((OldProtect & PAGE_NOACCESS) && !(NewProtect &
PAGE_NOACCESS))
+ {
+ MmEnableVirtualMapping(Process, addr);
+ }
+
+ /* Set new protection flags */
+ if(MmIsPagePresent(Process, addr))
+ {
+ MmSetPageProtect(Process, addr, NewProtect);
+ }
+ KeSetEvent(&PageOp->CompletionEvent, IO_NO_INCREMENT, FALSE);
+ MmReleasePageOp(PageOp);
+ addr += PAGE_SIZE;
}
}
}
Modified: trunk/reactos/ntoskrnl/mm/i386/page.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/i386/page.c?re…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/i386/page.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/i386/page.c [iso-8859-1] Tue Nov 22 22:01:06 2011
@@ -304,21 +304,17 @@
MmReleasePageMemoryConsumer(MC_SYSTEM, Pfn);
}
InterlockedExchangePte(PageDir, MmGlobalKernelPageDirectory[PdeOffset]);
- /* Flush it before accessing it */
- KeInvalidateTlbEntry(MiPteToAddress(PageDir));
RtlZeroMemory(MiPteToAddress(PageDir), PAGE_SIZE);
return (PULONG)MiAddressToPte(Address);
}
InterlockedExchangePte(PageDir, MmGlobalKernelPageDirectory[PdeOffset]);
- /* Flush it before accessing it */
- KeInvalidateTlbEntry(MiPteToAddress(PageDir));
}
return (PULONG)MiAddressToPte(Address);
}
BOOLEAN MmUnmapPageTable(PULONG Pt)
{
- if (Pt >= (PULONG)PAGETABLE_MAP && Pt < (PULONG)PAGETABLE_MAP +
1024*1024)
+ if (!IS_HYPERSPACE(Pt))
{
return TRUE;
}
@@ -383,7 +379,10 @@
Pte = *Pt;
} while (Pte != InterlockedCompareExchangePte(Pt, Pte & ~PA_PRESENT, Pte));
- MiFlushTlb(Pt, Address);
+ if(Pte & PA_PRESENT)
+ MiFlushTlb(Pt, Address);
+ else
+ MmUnmapPageTable(Pt);
WasValid = (PAGE_MASK(Pte) != 0);
if (!WasValid)
@@ -457,16 +456,17 @@
*/
Pte = InterlockedExchangePte(Pt, 0);
- MiFlushTlb(Pt, Address);
WasValid = (PAGE_MASK(Pte) != 0);
if (WasValid)
{
Pfn = PTE_TO_PFN(Pte);
+ MiFlushTlb(Pt, Address);
}
else
{
Pfn = 0;
+ MmUnmapPageTable(Pt);
}
if (FreePage && WasValid)
@@ -523,7 +523,13 @@
*/
Pte = InterlockedExchangePte(Pt, 0);
- MiFlushTlb(Pt, Address);
+ //MiFlushTlb(Pt, Address);
+ MmUnmapPageTable(Pt);
+
+ if(!(Pte & 0x800))
+ {
+ KeBugCheck(MEMORY_MANAGEMENT);
+ }
/*
* Return some information to the caller
@@ -632,8 +638,14 @@
Pt = MmGetPageTableForProcess(Process, Address, FALSE);
if (Pt == NULL)
{
- KeBugCheck(MEMORY_MANAGEMENT);
- }
+ //HACK to get DPH working, waiting for MM rewrite :-/
+ //KeBugCheck(MEMORY_MANAGEMENT);
+ return;
+ }
+
+ /* Do not mark a 0 page as present */
+ if(0 == InterlockedCompareExchangePte(Pt, 0, 0))
+ return;
do
{
@@ -695,9 +707,13 @@
{
KeBugCheck(MEMORY_MANAGEMENT);
}
- Pte = *Pt;
- InterlockedExchangePte(Pt, SwapEntry << 1);
- MiFlushTlb(Pt, Address);
+ Pte = InterlockedExchangePte(Pt, SwapEntry << 1);
+ if(PAGE_MASK(Pte))
+ {
+ KeBugCheck(MEMORY_MANAGEMENT);
+ }
+ //MiFlushTlb(Pt, Address);
+ MmUnmapPageTable(Pt);
return(STATUS_SUCCESS);
}
@@ -792,19 +808,19 @@
}
oldPdeOffset = PdeOffset;
- Pte = *Pt;
+ Pte = InterlockedExchangePte(Pt, PFN_TO_PTE(Pages[i]) | Attributes);;
/* There should not be anything valid here */
- if ((Pte & PA_PRESENT) || (Pte & 0x800))
- {
+ if (PAGE_MASK(Pte) != 0)
+ {
+ PMMPFN Pfn1 = MiGetPfnEntry(PTE_TO_PFN(Pte));
+ (void)Pfn1;
DPRINT1("Bad PTE %lx\n", Pte);
KeBugCheck(MEMORY_MANAGEMENT);
}
- InterlockedExchangePte(Pt, PFN_TO_PTE(Pages[i]) | Attributes);
/* flush if currently mapped, just continue editing if hyperspace
- * NOTE : Do not call MiFlushTlb, as it will unmap the page table,
- * and we might need it afterwards */
- if (Address >= MmSystemRangeStart ||
- (Pt >= (PULONG)PAGETABLE_MAP && Pt < (PULONG)PAGETABLE_MAP +
1024*1024))
+ * NOTE : This check is similar to what is done in MiFlushTlb, but we
+ * don't use it because it would unmap the page table */
+ if (Addr >= MmSystemRangeStart || (!IS_HYPERSPACE(Pt)))
{
KeInvalidateTlbEntry(Addr);
}
@@ -889,6 +905,7 @@
{
ULONG Attributes = 0;
PULONG Pt;
+ ULONG Pte;
DPRINT("MmSetPageProtect(Process %x Address %x flProtect %x)\n",
Process, Address, flProtect);
@@ -910,8 +927,17 @@
{
KeBugCheck(MEMORY_MANAGEMENT);
}
- InterlockedExchangePte(Pt, PAGE_MASK(*Pt) | Attributes | (*Pt &
(PA_ACCESSED|PA_DIRTY)));
- MiFlushTlb(Pt, Address);
+ Pte = InterlockedExchangePte(Pt, PAGE_MASK(*Pt) | Attributes | (*Pt &
(PA_ACCESSED|PA_DIRTY)));
+
+ if(!PAGE_MASK(Pte))
+ {
+ DPRINT1("Invalid Pte %lx\n", Pte);
+ __debugbreak();
+ }
+ if((Pte & Attributes) != Attributes)
+ MiFlushTlb(Pt, Address);
+ else
+ MmUnmapPageTable(Pt);
}
/*
Modified: trunk/reactos/ntoskrnl/mm/pageop.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/pageop.c?rev=5…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/pageop.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/pageop.c [iso-8859-1] Tue Nov 22 22:01:06 2011
@@ -145,6 +145,8 @@
ULONG_PTR Hash;
KIRQL oldIrql;
PMM_PAGEOP PageOp;
+
+ Address = (PVOID)PAGE_ROUND_DOWN(Address);
/*
* Calcuate the hash value for pageop structure
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