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[NTOS:MM] Simplify code & fix MSVC x64 build

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This commit is contained in:
Jérôme Gardou 2021-02-01 12:02:53 +01:00
parent 2ba1926037
commit 7f7abc9838
1 changed files with 11 additions and 41 deletions
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52
ntoskrnl/mm/rmap.c
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@ -102,7 +102,7 @@ GetEntry:
MmLockAddressSpace(AddressSpace);
if ((MmGetPfnForProcess(Process, Address) != Page) || MmIsPageAccessed(Process, Address))
if (MmGetPfnForProcess(Process, Address) != Page)
{
/* This changed in the short window where we didn't have any locks */
MmUnlockAddressSpace(AddressSpace);
@ -152,31 +152,8 @@ GetEntry:
/* Delete this virtual mapping in the process */
MmDeleteVirtualMapping(Process, Address, &Dirty, &MapPage);
/* There is a window betwwen the start of this function and now,
* where it's possible that the process changed its memory layout,
* because of copy-on-write, unmapping memory, or whatsoever.
* Just go away if that is the case */
if (MapPage != Page)
{
PMM_REGION Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
&MemoryArea->SectionData.RegionListHead,
Address, NULL);
/* Restore the mapping */
MmCreateVirtualMapping(Process, Address, Region->Protect, &MapPage, 1);
if (Dirty)
MmSetDirtyPage(Process, Address);
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
if (Address < MmSystemRangeStart)
{
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
}
/* We can still try to flush it to disk, though */
goto WriteSegment;
}
/* We checked this earlier */
ASSERT(MapPage == Page);
if (Page != PFN_FROM_SSE(Entry))
{
@ -232,11 +209,9 @@ GetEntry:
MmSetDirtyPage(Process, Address);
MmUnlockAddressSpace(AddressSpace);
if (Address < MmSystemRangeStart)
{
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
}
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
return STATUS_UNSUCCESSFUL;
}
}
@ -259,11 +234,9 @@ GetEntry:
#endif
MmReleasePageMemoryConsumer(MC_USER, Page);
if (Address < MmSystemRangeStart)
{
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
}
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
return STATUS_SUCCESS;
}
@ -276,11 +249,8 @@ GetEntry:
MmUnlockSectionSegment(Segment);
MmUnlockAddressSpace(AddressSpace);
if (Address < MmSystemRangeStart)
{
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
}
ExReleaseRundownProtection(&Process->RundownProtect);
ObDereferenceObject(Process);
if (Released) return STATUS_SUCCESS;
}