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[NTOS:MM] Fix a bit page fault handler with regard to COW sections

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Jérôme Gardou 2021-04-06 12:58:02 +02:00 committed by Jérôme Gardou
parent a34d9bcfb6
commit c48580135d
1 changed files with 48 additions and 34 deletions
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82
ntoskrnl/mm/section.c
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@ -1697,8 +1697,7 @@ MmNotPresentFaultSectionView(PMMSUPPORT AddressSpace,
* Check if this page needs to be mapped COW
*/
if ((Segment->WriteCopy) &&
(Region->Protect == PAGE_READWRITE ||
Region->Protect == PAGE_EXECUTE_READWRITE))
(Region->Protect == PAGE_READWRITE || Region->Protect == PAGE_EXECUTE_READWRITE))
{
Attributes = Region->Protect == PAGE_READWRITE ? PAGE_READONLY : PAGE_EXECUTE_READ;
}
@ -1883,32 +1882,70 @@ MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
PMM_SECTION_SEGMENT Segment;
PFN_NUMBER OldPage;
PFN_NUMBER NewPage;
NTSTATUS Status;
PVOID PAddress;
LARGE_INTEGER Offset;
PMM_REGION Region;
ULONG_PTR Entry;
PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
BOOLEAN Cow = FALSE;
ULONG NewProtect;
DPRINT("MmAccessFaultSectionView(%p, %p, %p)\n", AddressSpace, MemoryArea, Address);
/* Get the region for this address */
Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
&MemoryArea->SectionData.RegionListHead,
Address, NULL);
ASSERT(Region != NULL);
if (!(Region->Protect & PAGE_IS_WRITABLE))
return STATUS_ACCESS_VIOLATION;
/* Make sure we have a page mapping for this address. */
Status = MmNotPresentFaultSectionView(AddressSpace, MemoryArea, Address, Locked);
if (!NT_SUCCESS(Status))
if (!MmIsPagePresent(Process, Address))
{
/* This is invalid access ! */
return Status;
NTSTATUS Status = MmNotPresentFaultSectionView(AddressSpace, MemoryArea, Address, Locked);
if (!NT_SUCCESS(Status))
{
/* This is invalid access ! */
return Status;
}
}
/*
* Check if the page has already been set readwrite
*/
if (MmGetPageProtect(Process, Address) & PAGE_READWRITE)
if (MmGetPageProtect(Process, Address) & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE))
{
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
/* Check if we are doing Copy-On-Write */
Segment = MemoryArea->SectionData.Segment;
Cow = Segment->WriteCopy || (Region->Protect & PAGE_IS_WRITECOPY);
if (!Cow)
{
/* Simply update page protection and we're done */
MmSetPageProtect(Process, Address, Region->Protect);
return STATUS_SUCCESS;
}
/* Calculate the new protection & check if we should update the region */
NewProtect = Region->Protect;
if (NewProtect & PAGE_IS_WRITECOPY)
{
NewProtect &= ~PAGE_IS_WRITECOPY;
if (Region->Protect & PAGE_IS_EXECUTABLE)
NewProtect |= PAGE_EXECUTE_READWRITE;
else
NewProtect |= PAGE_READWRITE;
MmAlterRegion(AddressSpace, (PVOID)MA_GetStartingAddress(MemoryArea),
&MemoryArea->SectionData.RegionListHead,
Address, PAGE_SIZE, Region->Type, NewProtect,
MmAlterViewAttributes);
}
/*
* Find the offset of the page
*/
@ -1916,23 +1953,6 @@ MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
Offset.QuadPart = (ULONG_PTR)PAddress - MA_GetStartingAddress(MemoryArea)
+ MemoryArea->SectionData.ViewOffset;
Segment = MemoryArea->SectionData.Segment;
Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
&MemoryArea->SectionData.RegionListHead,
Address, NULL);
ASSERT(Region != NULL);
/*
* Check if we are doing COW
*/
if (!((Segment->WriteCopy) &&
(Region->Protect == PAGE_READWRITE ||
Region->Protect == PAGE_EXECUTE_READWRITE)))
{
DPRINT("Address 0x%p\n", Address);
return STATUS_ACCESS_VIOLATION;
}
/* Get the page mapping this section offset. */
MmLockSectionSegment(Segment);
Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
@ -1947,15 +1967,14 @@ MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
{
MmUnlockSectionSegment(Segment);
/* This is a private page. We must only change the page protection. */
MmSetPageProtect(Process, PAddress, Region->Protect);
MmSetPageProtect(Process, PAddress, NewProtect);
return STATUS_SUCCESS;
}
/*
* Allocate a page
*/
Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &NewPage);
if (!NT_SUCCESS(Status))
if (!NT_SUCCESS(MmRequestPageMemoryConsumer(MC_USER, TRUE, &NewPage)))
{
KeBugCheck(MEMORY_MANAGEMENT);
}
@ -1978,15 +1997,10 @@ MmAccessFaultSectionView(PMMSUPPORT AddressSpace,
/*
* Set the PTE to point to the new page
*/
Status = MmCreateVirtualMapping(Process,
PAddress,
Region->Protect,
NewPage);
if (!NT_SUCCESS(Status))
if (!NT_SUCCESS(MmCreateVirtualMapping(Process, PAddress, NewProtect, NewPage)))
{
DPRINT1("MmCreateVirtualMapping failed, unable to create virtual mapping, not out of memory\n");
KeBugCheck(MEMORY_MANAGEMENT);
return Status;
}
if (Process)