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- Check for a privat page and change only the page protection

Browse source 
for such a page in MmAccessFaultSectionView.

svn path=/trunk/; revision=7932
This commit is contained in:
Hartmut Birr 2004-01-30 23:57:58 +00:00
parent 5dee2e6519
commit dab0a77461
1 changed files with 18 additions and 10 deletions
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28
reactos/ntoskrnl/mm/section.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: section.c,v 1.142 2004/01/27 20:13:08 hbirr Exp $
/* $Id: section.c,v 1.143 2004/01/30 23:57:58 hbirr Exp $
*
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/section.c
@ -1218,6 +1218,7 @@ MmAccessFaultSectionView(PMADDRESS_SPACE AddressSpace,
ULONG Offset;
PMM_PAGEOP PageOp;
PMM_REGION Region;
ULONG Entry;
/*
* Check if the page has been paged out or has already been set readwrite
@ -1253,15 +1254,11 @@ MmAccessFaultSectionView(PMADDRESS_SPACE AddressSpace,
*/
MmLockSectionSegment(Segment);
/*
* Sanity check.
*/
if (MmGetPageEntrySectionSegment(Segment, Offset) == 0)
{
DPRINT1("COW fault for page with PESS 0. Address was 0x%.8X\n",
Address);
}
OldPage = MmGetPhysicalAddressForProcess(NULL, Address);
Entry = MmGetPageEntrySectionSegment(Segment, Offset);
MmUnlockSectionSegment(Segment);
/*
* Check if we are doing COW
*/
@ -1273,6 +1270,18 @@ MmAccessFaultSectionView(PMADDRESS_SPACE AddressSpace,
return(STATUS_UNSUCCESSFUL);
}
if (IS_SWAP_FROM_SSE(Entry) ||
PAGE_FROM_SSE(Entry) != OldPage.u.LowPart)
{
/* This is a private page. We must only change the page protection. */
MmSetPageProtect(AddressSpace->Process, (PVOID)PAddress, Region->Protect);
if (Locked)
{
MmLockPage(OldPage);
}
return(STATUS_SUCCESS);
}
/*
* Get or create a pageop
*/
@ -1330,7 +1339,6 @@ MmAccessFaultSectionView(PMADDRESS_SPACE AddressSpace,
/*
* Copy the old page
*/
OldPage = MmGetPhysicalAddressForProcess(NULL, Address);
NewAddress = ExAllocatePageWithPhysPage(NewPage);
memcpy(NewAddress, (PVOID)PAddress, PAGE_SIZE);