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[NTOS]: Preparations for the VAD-based Virtual Memory system begin. Disable changing protection on Virtual Memory pages, and make all pages PAGE_EXECUTE_READWRITE for now. In theory, this should not cause any real problems, and sets the stage for the initial functionality regressions that the VAD-based system will introduce. I will eventually plan on fixing them.

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svn path=/trunk/; revision=55883
This commit is contained in:
Sir Richard 2012-02-27 16:12:11 +00:00
parent 2c7855ed9d
commit aaa881ed5a
1 changed files with 6 additions and 83 deletions
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89
reactos/ntoskrnl/mm/anonmem.c
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@ -527,9 +527,7 @@ MiProtectVirtualMemory(IN PEPROCESS Process,
if (MemoryArea->Type == MEMORY_AREA_VIRTUAL_MEMORY)
{
Status = MmProtectAnonMem(AddressSpace, MemoryArea, *BaseAddress,
*NumberOfBytesToProtect, NewAccessProtection,
OldAccessProtection);
Status = STATUS_SUCCESS;
}
else if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
{
@ -775,6 +773,11 @@ NtAllocateVirtualMemory(IN HANDLE ProcessHandle,
AddressSpace = &Process->Vm;
MmLockAddressSpace(AddressSpace);
//
// Force PAGE_EXECUTE_READWRITE for everything, for now
//
Protect = PAGE_EXECUTE_READWRITE;
if (PBaseAddress != 0)
{
@ -1249,84 +1252,4 @@ unlock_deref_and_return:
return(Status);
}
NTSTATUS
NTAPI
MmProtectAnonMem(PMMSUPPORT AddressSpace,
PMEMORY_AREA MemoryArea,
PVOID BaseAddress,
SIZE_T Length,
ULONG Protect,
PULONG OldProtect)
{
PMM_REGION Region;
NTSTATUS Status = STATUS_SUCCESS;
ULONG_PTR LengthCount = 0;
/* Search all Regions in MemoryArea up to Length */
/* Every Region up to Length must be committed for success */
for (;;)
{
Region = MmFindRegion(MemoryArea->StartingAddress,
&MemoryArea->Data.VirtualMemoryData.RegionListHead,
(PVOID)((ULONG_PTR)BaseAddress + LengthCount), NULL);
/* If a Region was found and it is committed */
if ((Region) && (Region->Type == MEM_COMMIT))
{
LengthCount += Region->Length;
if (Length <= LengthCount) break;
continue;
}
/* If Region was found and it is not commited */
else if (Region)
{
Status = STATUS_NOT_COMMITTED;
break;
}
/* If no Region was found at all */
else if (LengthCount == 0)
{
Status = STATUS_INVALID_ADDRESS;
break;
}
}
if (NT_SUCCESS(Status))
{
*OldProtect = Region->Protect;
Status = MmAlterRegion(AddressSpace, MemoryArea->StartingAddress,
&MemoryArea->Data.VirtualMemoryData.RegionListHead,
BaseAddress, Length, Region->Type, Protect,
MmModifyAttributes);
}
return (Status);
}
NTSTATUS NTAPI
MmQueryAnonMem(PMEMORY_AREA MemoryArea,
PVOID Address,
PMEMORY_BASIC_INFORMATION Info,
PSIZE_T ResultLength)
{
PMM_REGION Region;
PVOID RegionBase = NULL;
Info->BaseAddress = (PVOID)PAGE_ROUND_DOWN(Address);
Region = MmFindRegion(MemoryArea->StartingAddress,
&MemoryArea->Data.VirtualMemoryData.RegionListHead,
Address, &RegionBase);
Info->BaseAddress = RegionBase;
Info->AllocationBase = MemoryArea->StartingAddress;
Info->AllocationProtect = MemoryArea->Protect;
Info->RegionSize = Region->Length;
Info->State = Region->Type;
Info->Protect = Region->Protect;
Info->Type = MEM_PRIVATE;
*ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
return(STATUS_SUCCESS);
}
/* EOF */