-/* $Id: virtual.c,v 1.32 2000/07/07 10:30:56 dwelch Exp $
+/* $Id$
*
- * COPYRIGHT: See COPYING in the top directory
- * PROJECT: ReactOS kernel
- * FILE: ntoskrnl/mm/virtual.c
- * PURPOSE: implementing the Virtualxxx section of the win32 api
- * PROGRAMMER: David Welch
- * UPDATE HISTORY:
- * 09/4/98: Created
- * 10/6/98: Corrections from Fatahi (i_fatahi@hotmail.com)
- * 30/9/98: Implemented ZwxxxVirtualMemory functions
+ * COPYRIGHT: See COPYING in the top level directory
+ * PROJECT: ReactOS kernel
+ * FILE: ntoskrnl/mm/virtual.c
+ * PURPOSE: Implementing operations on virtual memory.
+ *
+ * PROGRAMMERS: David Welch
*/
-
+
/* INCLUDE *****************************************************************/
-#include <ddk/ntddk.h>
-#include <internal/mm.h>
-#include <internal/mmhal.h>
-#include <internal/ob.h>
-#include <internal/io.h>
-#include <internal/ps.h>
-#include <string.h>
-#include <internal/string.h>
+#include <ntoskrnl.h>
#define NDEBUG
#include <internal/debug.h>
-/* FUNCTIONS ****************************************************************/
+/* FUNCTIONS *****************************************************************/
-NTSTATUS MmWritePageVirtualMemory(PMADDRESS_SPACE AddressSpace,
- PMEMORY_AREA MArea,
- PVOID Address)
+NTSTATUS STDCALL
+NtFlushVirtualMemory(IN HANDLE ProcessHandle,
+ IN PVOID BaseAddress,
+ IN ULONG NumberOfBytesToFlush,
+ OUT PULONG NumberOfBytesFlushed OPTIONAL)
+/*
+ * FUNCTION: Flushes virtual memory to file
+ * ARGUMENTS:
+ * ProcessHandle = Points to the process that allocated the virtual
+ * memory
+ * BaseAddress = Points to the memory address
+ * NumberOfBytesToFlush = Limits the range to flush,
+ * NumberOfBytesFlushed = Actual number of bytes flushed
+ * RETURNS: Status
+ */
{
- SWAPENTRY se;
- ULONG Flags;
- PHYSICAL_ADDRESS PhysicalAddress;
- PMDL Mdl;
- NTSTATUS Status;
-
- /*
- * FIXME: What should we do if an i/o operation is pending on
- * this page
- */
-
- /*
- * If the memory area is readonly then there is nothing to do
- */
- if (MArea->Attributes & PAGE_READONLY ||
- MArea->Attributes & PAGE_EXECUTE_READ)
- {
- return(STATUS_SUCCESS);
- }
- /*
- * Set the page to readonly. This ensures the current contents aren't
- * modified while we are writing it to swap.
- */
- MmSetPageProtect(AddressSpace->Process,
- Address,
- PAGE_READONLY);
- /*
- * If the page isn't dirty then there is nothing to do.
- */
- if (!MmIsPageDirty(AddressSpace->Process, Address))
- {
- MmSetPageProtect(AddressSpace->Process,
- Address,
- MArea->Attributes);
- return(STATUS_SUCCESS);
- }
- PhysicalAddress = MmGetPhysicalAddress(Address);
- /*
- * If we haven't already allocated a swap entry for this page
- * then allocate one
- */
- if ((se = MmGetSavedSwapEntryPage((PVOID)PhysicalAddress.u.LowPart)) != 0)
- {
- se = MmAllocSwapPage();
- if (se == 0)
- {
- MmSetPageProtect(AddressSpace->Process,
- Address,
- MArea->Attributes);
- return(STATUS_UNSUCCESSFUL);
- }
- MmSetSavedSwapEntryPage((PVOID)PhysicalAddress.u.LowPart, se);
- }
- /*
- * Set the flags so other threads will know what we are doing
- */
- Flags = MmGetFlagsPage((PVOID)PhysicalAddress.u.LowPart);
- Flags = Flags | MM_PHYSICAL_PAGE_MPW_PENDING;
- MmSetFlagsPage((PVOID)PhysicalAddress.u.LowPart, Flags);
- /*
- * Build an mdl to hold the page for writeout
- */
- Mdl = MmCreateMdl(NULL, NULL, PAGESIZE);
- MmBuildMdlFromPages(Mdl, (PULONG)&PhysicalAddress.u.LowPart);
- /*
- * Unlock the address space and write out the page to swap.
- */
- MmUnlockAddressSpace(AddressSpace);
- Status = MmWriteToSwapPage(se, Mdl);
- /*
- * Cleanup
- */
- MmLockAddressSpace(AddressSpace);
- Flags = MmGetFlagsPage((PVOID)PhysicalAddress.u.LowPart);
- Flags = Flags & (~MM_PHYSICAL_PAGE_MPW_PENDING);
- MmSetFlagsPage((PVOID)PhysicalAddress.u.LowPart,Flags);
- /*
- * If we successfully wrote the page then reset the dirty bit
- */
- if (NT_SUCCESS(Status))
- {
- MmSetCleanPage(AddressSpace->Process, Address);
- }
- return(Status);
+ /* This should be implemented once we support network filesystems */
+ DPRINT("NtFlushVirtualMemory is UNIMPLEMENTED\n");
+ return(STATUS_SUCCESS);
}
-ULONG MmPageOutVirtualMemory(PMADDRESS_SPACE AddressSpace,
- PMEMORY_AREA MemoryArea,
- PVOID Address,
- PBOOLEAN Ul)
+NTSTATUS STDCALL
+MiLockVirtualMemory(HANDLE ProcessHandle,
+ PVOID BaseAddress,
+ ULONG NumberOfBytesToLock,
+ PULONG NumberOfBytesLocked,
+ PObReferenceObjectByHandle pObReferenceObjectByHandle,
+ PMmCreateMdl pMmCreateMdl,
+ PObDereferenceObject pObDereferenceObject,
+ PMmProbeAndLockPages pMmProbeAndLockPages,
+ PExFreePool pExFreePool)
{
- PHYSICAL_ADDRESS PhysicalAddress;
-
- if ((MemoryArea->Attributes & PAGE_READONLY) ||
- (MemoryArea->Attributes & PAGE_EXECUTE_READ) ||
- !MmIsPageDirty(PsGetCurrentProcess(), Address))
- {
- PhysicalAddress = MmGetPhysicalAddress(Address);
-
- MmRemovePageFromWorkingSet(AddressSpace->Process,
- Address);
- MmSetPage(PsGetCurrentProcess(),
- Address,
- 0,
- 0);
- MmDereferencePage((PVOID)PhysicalAddress.u.LowPart);
- *Ul = TRUE;
- return(1);
- }
- *Ul = FALSE;
- return(0);
+ PEPROCESS Process;
+ NTSTATUS Status;
+ PMDL Mdl;
+
+ Status = pObReferenceObjectByHandle(ProcessHandle,
+ PROCESS_VM_WRITE,
+ NULL,
+ UserMode,
+ (PVOID*)(&Process),
+ NULL);
+ if (!NT_SUCCESS(Status))
+ return(Status);
+
+ Mdl = pMmCreateMdl(NULL,
+ BaseAddress,
+ NumberOfBytesToLock);
+ if (Mdl == NULL)
+ {
+ pObDereferenceObject(Process);
+ return(STATUS_NO_MEMORY);
+ }
+
+ pMmProbeAndLockPages(Mdl,
+ UserMode,
+ IoWriteAccess);
+
+ pExFreePool(Mdl);
+
+ pObDereferenceObject(Process);
+
+ *NumberOfBytesLocked = NumberOfBytesToLock;
+ return(STATUS_SUCCESS);
}
-NTSTATUS MmNotPresentFaultVirtualMemory(PMADDRESS_SPACE AddressSpace,
- MEMORY_AREA* MemoryArea,
- PVOID Address)
-/*
- * FUNCTION: Move data into memory to satisfy a page not present fault
- * ARGUMENTS:
- * AddressSpace = Address space within which the fault occurred
- * MemoryArea = The memory area within which the fault occurred
- * Address = The absolute address of fault
- * RETURNS: Status
- * NOTES: This function is called with the address space lock held.
- */
+
+NTSTATUS STDCALL
+NtLockVirtualMemory(HANDLE ProcessHandle,
+ PVOID BaseAddress,
+ ULONG NumberOfBytesToLock,
+ PULONG NumberOfBytesLocked)
{
- PVOID Page;
- NTSTATUS Status;
-
- if (MmIsPagePresent(NULL, Address))
- {
- return(STATUS_SUCCESS);
- }
-
- Page = MmAllocPage(0);
- while (Page == NULL)
- {
- MmUnlockAddressSpace(AddressSpace);
- MmWaitForFreePages();
- MmLockAddressSpace(AddressSpace);
- if (MmIsPagePresent(NULL, Address))
- {
- return(STATUS_SUCCESS);
- }
- Page = MmAllocPage(0);
- }
- Status = MmCreatePageTable(Address);
- while (!NT_SUCCESS(Status))
- {
- MmUnlockAddressSpace(AddressSpace);
- MmWaitForFreePages();
- MmLockAddressSpace(AddressSpace);
- if (MmIsPagePresent(NULL, Address))
- {
- MmDereferencePage(Page);
- return(STATUS_SUCCESS);
- }
- Status = MmCreatePageTable(Address);
- }
- MmAddPageToWorkingSet(PsGetCurrentProcess(), Address);
- MmSetPage(PsGetCurrentProcess(),
- Address,
- MemoryArea->Attributes,
- (ULONG)Page);
-
- return(STATUS_SUCCESS);
+ DPRINT("NtLockVirtualMemory(ProcessHandle %x, BaseAddress %x, "
+ "NumberOfBytesToLock %d, NumberOfBytesLocked %x)\n",
+ ProcessHandle,
+ BaseAddress,
+ NumberOfBytesToLock,
+ NumberOfBytesLocked);
+
+ return MiLockVirtualMemory(ProcessHandle,
+ BaseAddress,
+ NumberOfBytesToLock,
+ NumberOfBytesLocked,
+ ObReferenceObjectByHandle,
+ MmCreateMdl,
+ ObfDereferenceObject,
+ MmProbeAndLockPages,
+ ExFreePool);
}
-NTSTATUS STDCALL NtAllocateVirtualMemory(IN HANDLE ProcessHandle,
- IN OUT PVOID * BaseAddress,
- IN ULONG ZeroBits,
- IN OUT PULONG RegionSize,
- IN ULONG AllocationType,
- IN ULONG Protect)
-/*
- * FUNCTION: Allocates a block of virtual memory in the process address space
- * ARGUMENTS:
- * ProcessHandle = The handle of the process which owns the virtual memory
- * BaseAddress = A pointer to the virtual memory allocated. If you
- * supply a non zero value the system will try to
- * allocate the memory at the address supplied. It round
- * it down to a multiple of the page size.
- * ZeroBits = (OPTIONAL) You can specify the number of high order bits
- * that must be zero, ensuring that the memory will be
- * allocated at a address below a certain value.
- * RegionSize = The number of bytes to allocate
- * AllocationType = Indicates the type of virtual memory you like to
- * allocated, can be one of the values : MEM_COMMIT,
- * MEM_RESERVE, MEM_RESET, MEM_TOP_DOWN
- * Protect = Indicates the protection type of the pages allocated, can be
- * a combination of PAGE_READONLY, PAGE_READWRITE,
- * PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE, PAGE_GUARD,
- * PAGE_NOACCESS
- * REMARKS:
- * This function maps to the win32 VirtualAllocEx. Virtual memory is
- * process based so the protocol starts with a ProcessHandle. I
- * splitted the functionality of obtaining the actual address and
- * specifying the start address in two parameters ( BaseAddress and
- * StartAddress ) The NumberOfBytesAllocated specify the range and the
- * AllocationType and ProctectionType map to the other two parameters.
- * RETURNS: Status
- */
+
+NTSTATUS FASTCALL
+MiQueryVirtualMemory (IN HANDLE ProcessHandle,
+ IN PVOID Address,
+ IN CINT VirtualMemoryInformationClass,
+ OUT PVOID VirtualMemoryInformation,
+ IN ULONG Length,
+ OUT PULONG ResultLength)
{
+ NTSTATUS Status;
PEPROCESS Process;
MEMORY_AREA* MemoryArea;
- ULONG Type;
- NTSTATUS Status;
PMADDRESS_SPACE AddressSpace;
-
- DPRINT("NtAllocateVirtualMemory(ProcessHandle %x, *BaseAddress %x, "
- "ZeroBits %d, *RegionSize %x, AllocationType %x, Protect %x)\n",
- ProcessHandle,*BaseAddress,ZeroBits,*RegionSize,AllocationType,
- Protect);
-
- Status = ObReferenceObjectByHandle(ProcessHandle,
- PROCESS_VM_OPERATION,
- NULL,
- UserMode,
- (PVOID*)(&Process),
- NULL);
- if (Status != STATUS_SUCCESS)
- {
- DPRINT("NtAllocateVirtualMemory() = %x\n",Status);
- return(Status);
- }
-
- if (AllocationType & MEM_RESERVE)
- {
- Type = MEMORY_AREA_RESERVE;
- }
+
+ if (Address < MmSystemRangeStart)
+ {
+ Status = ObReferenceObjectByHandle(ProcessHandle,
+ PROCESS_QUERY_INFORMATION,
+ NULL,
+ UserMode,
+ (PVOID*)(&Process),
+ NULL);
+
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT("NtQueryVirtualMemory() = %x\n",Status);
+ return(Status);
+ }
+ AddressSpace = &Process->AddressSpace;
+ }
else
- {
- Type = MEMORY_AREA_COMMIT;
- }
-
- AddressSpace = &Process->AddressSpace;
+ {
+ AddressSpace = MmGetKernelAddressSpace();
+ }
MmLockAddressSpace(AddressSpace);
-
- if ((*BaseAddress) != 0)
- {
- MemoryArea = MmOpenMemoryAreaByAddress(&Process->AddressSpace,
- *BaseAddress);
-
- if (MemoryArea != NULL)
- {
- if (MemoryArea->BaseAddress == (*BaseAddress) &&
- MemoryArea->Length == *RegionSize)
+ MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, Address);
+ switch(VirtualMemoryInformationClass)
+ {
+ case MemoryBasicInformation:
+ {
+ PMEMORY_BASIC_INFORMATION Info =
+ (PMEMORY_BASIC_INFORMATION)VirtualMemoryInformation;
+ if (Length != sizeof(MEMORY_BASIC_INFORMATION))
+ {
+ MmUnlockAddressSpace(AddressSpace);
+ ObDereferenceObject(Process);
+ return(STATUS_INFO_LENGTH_MISMATCH);
+ }
+
+ if (MemoryArea == NULL)
+ {
+ Info->Type = 0;
+ Info->State = MEM_FREE;
+ Info->Protect = PAGE_NOACCESS;
+ Info->AllocationProtect = 0;
+ Info->BaseAddress = (PVOID)PAGE_ROUND_DOWN(Address);
+ Info->AllocationBase = NULL;
+ Info->RegionSize = MmFindGapAtAddress(AddressSpace, Info->BaseAddress);
+ Status = STATUS_SUCCESS;
+ *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
+ }
+ else
+ {
+ switch(MemoryArea->Type)
{
- MemoryArea->Type = Type;
- MemoryArea->Attributes = Protect;
- DPRINT("*BaseAddress %x\n",*BaseAddress);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_SUCCESS);
+ case MEMORY_AREA_VIRTUAL_MEMORY:
+ case MEMORY_AREA_PEB_OR_TEB:
+ Status = MmQueryAnonMem(MemoryArea, Address, Info,
+ ResultLength);
+ break;
+ case MEMORY_AREA_SECTION_VIEW:
+ Status = MmQuerySectionView(MemoryArea, Address, Info,
+ ResultLength);
+ break;
+ case MEMORY_AREA_NO_ACCESS:
+ Info->Type = MEM_PRIVATE;
+ Info->State = MEM_RESERVE;
+ Info->Protect = MemoryArea->Attributes;
+ Info->AllocationProtect = MemoryArea->Attributes;
+ Info->BaseAddress = MemoryArea->StartingAddress;
+ Info->AllocationBase = MemoryArea->StartingAddress;
+ Info->RegionSize = (ULONG_PTR)MemoryArea->EndingAddress -
+ (ULONG_PTR)MemoryArea->StartingAddress;
+ Status = STATUS_SUCCESS;
+ *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
+ break;
+ case MEMORY_AREA_SHARED_DATA:
+ Info->Type = MEM_PRIVATE;
+ Info->State = MEM_COMMIT;
+ Info->Protect = MemoryArea->Attributes;
+ Info->AllocationProtect = MemoryArea->Attributes;
+ Info->BaseAddress = MemoryArea->StartingAddress;
+ Info->AllocationBase = MemoryArea->StartingAddress;
+ Info->RegionSize = (ULONG_PTR)MemoryArea->EndingAddress -
+ (ULONG_PTR)MemoryArea->StartingAddress;
+ Status = STATUS_SUCCESS;
+ *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
+ break;
+ case MEMORY_AREA_SYSTEM:
+ Info->Type = 0;
+ Info->State = MEM_COMMIT;
+ Info->Protect = MemoryArea->Attributes;
+ Info->AllocationProtect = MemoryArea->Attributes;
+ Info->BaseAddress = MemoryArea->StartingAddress;
+ Info->AllocationBase = MemoryArea->StartingAddress;
+ Info->RegionSize = (ULONG_PTR)MemoryArea->EndingAddress -
+ (ULONG_PTR)MemoryArea->StartingAddress;
+ Status = STATUS_SUCCESS;
+ *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
+ break;
+ case MEMORY_AREA_KERNEL_STACK:
+ Info->Type = 0;
+ Info->State = MEM_COMMIT;
+ Info->Protect = MemoryArea->Attributes;
+ Info->AllocationProtect = MemoryArea->Attributes;
+ Info->BaseAddress = MemoryArea->StartingAddress;
+ Info->AllocationBase = MemoryArea->StartingAddress;
+ Info->RegionSize = (ULONG_PTR)MemoryArea->EndingAddress -
+ (ULONG_PTR)MemoryArea->StartingAddress;
+ Status = STATUS_SUCCESS;
+ *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
+ break;
+ case MEMORY_AREA_PAGED_POOL:
+ Info->Type = 0;
+ Info->State = MEM_COMMIT;
+ Info->Protect = MemoryArea->Attributes;
+ Info->AllocationProtect = MemoryArea->Attributes;
+ Info->BaseAddress = MemoryArea->StartingAddress;
+ Info->AllocationBase = MemoryArea->StartingAddress;
+ Info->RegionSize = (ULONG_PTR)MemoryArea->EndingAddress -
+ (ULONG_PTR)MemoryArea->StartingAddress;
+ Status = STATUS_SUCCESS;
+ *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
+ break;
+ default:
+ DPRINT1("unhandled memory area type: 0x%x\n", MemoryArea->Type);
+ Status = STATUS_UNSUCCESSFUL;
+ *ResultLength = 0;
}
-
- MemoryArea = MmSplitMemoryArea(Process,
- &Process->AddressSpace,
- MemoryArea,
- *BaseAddress,
- *RegionSize,
- Type,
- Protect);
- DPRINT("*BaseAddress %x\n",*BaseAddress);
- /* FIXME: Reserve/dereserve swap pages */
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_SUCCESS);
- }
- }
-
- Status = MmCreateMemoryArea(Process,
- &Process->AddressSpace,
- Type,
- BaseAddress,
- *RegionSize,
- Protect,
- &MemoryArea);
-
- if (Status != STATUS_SUCCESS)
- {
- DPRINT("NtAllocateVirtualMemory() = %x\n",Status);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(Status);
- }
+ }
+ break;
+ }
+
+ default:
+ {
+ Status = STATUS_INVALID_INFO_CLASS;
+ *ResultLength = 0;
+ break;
+ }
+ }
+
+ MmUnlockAddressSpace(AddressSpace);
+ if (Address < MmSystemRangeStart)
+ {
+ ObDereferenceObject(Process);
+ }
+
+ return Status;
+}
+
+/* (tMk 2004.II.4)
+ * FUNCTION:
+ * Called from VirtualQueryEx (lib\kernel32\mem\virtual.c)
+ *
+ */
+NTSTATUS STDCALL
+NtQueryVirtualMemory (IN HANDLE ProcessHandle,
+ IN PVOID Address,
+ IN MEMORY_INFORMATION_CLASS VirtualMemoryInformationClass,
+ OUT PVOID VirtualMemoryInformation,
+ IN ULONG Length,
+ OUT PULONG UnsafeResultLength)
+{
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONG ResultLength = 0;
+ KPROCESSOR_MODE PreviousMode;
+ union
+ {
+ MEMORY_BASIC_INFORMATION BasicInfo;
+ }
+ VirtualMemoryInfo;
+
+ DPRINT("NtQueryVirtualMemory(ProcessHandle %x, Address %x, "
+ "VirtualMemoryInformationClass %d, VirtualMemoryInformation %x, "
+ "Length %lu ResultLength %x)\n",ProcessHandle,Address,
+ VirtualMemoryInformationClass,VirtualMemoryInformation,
+ Length,ResultLength);
+
+ PreviousMode = ExGetPreviousMode();
- DPRINT("*BaseAddress %x\n",*BaseAddress);
- if ((AllocationType & MEM_COMMIT) &&
- ((Protect & PAGE_READWRITE) ||
- (Protect & PAGE_EXECUTE_READWRITE)))
+ if (PreviousMode != KernelMode && UnsafeResultLength != NULL)
{
- MmReserveSwapPages(PAGE_ROUND_UP((*RegionSize)));
+ _SEH_TRY
+ {
+ ProbeForWriteUlong(UnsafeResultLength);
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
}
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_SUCCESS);
+
+ if (Address >= MmSystemRangeStart)
+ {
+ DPRINT1("Invalid parameter\n");
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ Status = MiQueryVirtualMemory ( ProcessHandle,
+ Address,
+ VirtualMemoryInformationClass,
+ &VirtualMemoryInfo,
+ Length,
+ &ResultLength );
+
+ if (NT_SUCCESS(Status))
+ {
+ if (PreviousMode != KernelMode)
+ {
+ _SEH_TRY
+ {
+ if (ResultLength > 0)
+ {
+ ProbeForWrite(VirtualMemoryInformation,
+ ResultLength,
+ 1);
+ RtlCopyMemory(VirtualMemoryInformation,
+ &VirtualMemoryInfo,
+ ResultLength);
+ }
+ if (UnsafeResultLength != NULL)
+ {
+ *UnsafeResultLength = ResultLength;
+ }
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
+ else
+ {
+ if (ResultLength > 0)
+ {
+ RtlCopyMemory(VirtualMemoryInformation,
+ &VirtualMemoryInfo,
+ ResultLength);
+ }
+
+ if (UnsafeResultLength != NULL)
+ {
+ *UnsafeResultLength = ResultLength;
+ }
+ }
+ }
+
+ return(Status);
}
-NTSTATUS STDCALL NtFlushVirtualMemory(IN HANDLE ProcessHandle,
- IN PVOID BaseAddress,
- IN ULONG NumberOfBytesToFlush,
- OUT PULONG NumberOfBytesFlushed OPTIONAL)
-/*
- * FUNCTION: Flushes virtual memory to file
- * ARGUMENTS:
- * ProcessHandle = Points to the process that allocated the virtual
- * memory
- * BaseAddress = Points to the memory address
- * NumberOfBytesToFlush = Limits the range to flush,
- * NumberOfBytesFlushed = Actual number of bytes flushed
- * RETURNS: Status
- */
+NTSTATUS STDCALL
+MiProtectVirtualMemory(IN PEPROCESS Process,
+ IN OUT PVOID *BaseAddress,
+ IN OUT PULONG NumberOfBytesToProtect,
+ IN ULONG NewAccessProtection,
+ OUT PULONG OldAccessProtection OPTIONAL)
{
- UNIMPLEMENTED;
+ PMEMORY_AREA MemoryArea;
+ PMADDRESS_SPACE AddressSpace;
+ ULONG OldAccessProtection_;
+ NTSTATUS Status;
+
+ *NumberOfBytesToProtect =
+ PAGE_ROUND_UP((*BaseAddress) + (*NumberOfBytesToProtect)) -
+ PAGE_ROUND_DOWN(*BaseAddress);
+ *BaseAddress = (PVOID)PAGE_ROUND_DOWN(*BaseAddress);
+
+ AddressSpace = &Process->AddressSpace;
+
+ MmLockAddressSpace(AddressSpace);
+ MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, *BaseAddress);
+ if (MemoryArea == NULL)
+ {
+ MmUnlockAddressSpace(AddressSpace);
+ return STATUS_UNSUCCESSFUL;
+ }
+
+ if (OldAccessProtection == NULL)
+ OldAccessProtection = &OldAccessProtection_;
+
+ if (MemoryArea->Type == MEMORY_AREA_VIRTUAL_MEMORY)
+ {
+ Status = MmProtectAnonMem(AddressSpace, MemoryArea, *BaseAddress,
+ *NumberOfBytesToProtect, NewAccessProtection,
+ OldAccessProtection);
+ }
+ else if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
+ {
+ Status = MmProtectSectionView(AddressSpace, MemoryArea, *BaseAddress,
+ *NumberOfBytesToProtect,
+ NewAccessProtection,
+ OldAccessProtection);
+ }
+ else
+ {
+ /* FIXME: Should we return failure or success in this case? */
+ Status = STATUS_CONFLICTING_ADDRESSES;
+ }
+
+ MmUnlockAddressSpace(AddressSpace);
+
+ return Status;
}
-NTSTATUS STDCALL NtFreeVirtualMemory(IN HANDLE ProcessHandle,
- IN PVOID * BaseAddress,
- IN PULONG RegionSize,
- IN ULONG FreeType)
-/*
- * FUNCTION: Frees a range of virtual memory
- * ARGUMENTS:
- * ProcessHandle = Points to the process that allocated the virtual
- * memory
- * BaseAddress = Points to the memory address, rounded down to a
- * multiple of the pagesize
- * RegionSize = Limits the range to free, rounded up to a multiple of
- * the paging size
- * FreeType = Can be one of the values: MEM_DECOMMIT, or MEM_RELEASE
- * RETURNS: Status
+/* (tMk 2004.II.5)
+ * FUNCTION:
+ * Called from VirtualProtectEx (lib\kernel32\mem\virtual.c)
+ *
*/
+NTSTATUS STDCALL
+NtProtectVirtualMemory(IN HANDLE ProcessHandle,
+ IN OUT PVOID *UnsafeBaseAddress,
+ IN OUT ULONG *UnsafeNumberOfBytesToProtect,
+ IN ULONG NewAccessProtection,
+ OUT PULONG UnsafeOldAccessProtection)
{
- MEMORY_AREA* MemoryArea;
- NTSTATUS Status;
PEPROCESS Process;
- PMADDRESS_SPACE AddressSpace;
- ULONG i;
+ ULONG OldAccessProtection;
+ PVOID BaseAddress = NULL;
+ ULONG NumberOfBytesToProtect = 0;
+ KPROCESSOR_MODE PreviousMode;
+ NTSTATUS Status = STATUS_SUCCESS;
- DPRINT("NtFreeVirtualMemory(ProcessHandle %x, *BaseAddress %x, "
- "*RegionSize %x, FreeType %x)\n",ProcessHandle,*BaseAddress,
- *RegionSize,FreeType);
-
+ PreviousMode = ExGetPreviousMode();
- Status = ObReferenceObjectByHandle(ProcessHandle,
- PROCESS_VM_OPERATION,
- PsProcessType,
- UserMode,
- (PVOID*)(&Process),
- NULL);
- if (Status != STATUS_SUCCESS)
+ if (PreviousMode != KernelMode)
{
- return(Status);
+ _SEH_TRY
+ {
+ ProbeForWritePointer(UnsafeBaseAddress);
+ ProbeForWriteUlong(UnsafeNumberOfBytesToProtect);
+ ProbeForWriteUlong(UnsafeOldAccessProtection);
+
+ BaseAddress = *UnsafeBaseAddress;
+ NumberOfBytesToProtect = *UnsafeNumberOfBytesToProtect;
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
}
-
- AddressSpace = &Process->AddressSpace;
-
- MmLockAddressSpace(AddressSpace);
- MemoryArea = MmOpenMemoryAreaByAddress(AddressSpace,
- *BaseAddress);
- if (MemoryArea == NULL)
+ else
{
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_UNSUCCESSFUL);
+ BaseAddress = *UnsafeBaseAddress;
+ NumberOfBytesToProtect = *UnsafeNumberOfBytesToProtect;
}
-
- switch (FreeType)
+
+ if ((ULONG_PTR)BaseAddress + NumberOfBytesToProtect - 1 < (ULONG_PTR)BaseAddress ||
+ (ULONG_PTR)BaseAddress + NumberOfBytesToProtect - 1 >= MmUserProbeAddress)
{
- case MEM_RELEASE:
- if (MemoryArea->BaseAddress != (*BaseAddress))
- {
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_UNSUCCESSFUL);
- }
- if ((MemoryArea->Type == MEMORY_AREA_COMMIT) &&
- ((MemoryArea->Attributes & PAGE_READWRITE) ||
- (MemoryArea->Attributes & PAGE_EXECUTE_READWRITE)))
- {
- MmDereserveSwapPages(PAGE_ROUND_UP(MemoryArea->Length));
- }
-
- for (i=0; i<=(MemoryArea->Length/PAGESIZE); i++)
- {
- LARGE_INTEGER PhysicalAddr;
-
- PhysicalAddr = MmGetPhysicalAddress(MemoryArea->BaseAddress +
- (i*PAGESIZE));
- if (PhysicalAddr.u.LowPart != 0)
- {
- MmRemovePageFromWorkingSet(AddressSpace->Process,
- MemoryArea->BaseAddress +
- (i*PAGESIZE));
- MmDereferencePage((PVOID)(ULONG)(PhysicalAddr.u.LowPart));
- }
- }
-
- MmFreeMemoryArea(&Process->AddressSpace,
- BaseAddress,
- 0,
- FALSE);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_SUCCESS);
-
- case MEM_DECOMMIT:
- if ((MemoryArea->Type == MEMORY_AREA_COMMIT) &&
- ((MemoryArea->Attributes & PAGE_READWRITE) ||
- (MemoryArea->Attributes & PAGE_EXECUTE_READWRITE)))
- {
- MmDereserveSwapPages(PAGE_ROUND_UP((*RegionSize)));
- }
- MmSplitMemoryArea(Process,
- &Process->AddressSpace,
- MemoryArea,
- *BaseAddress,
- *RegionSize,
- MEMORY_AREA_RESERVE,
- MemoryArea->Attributes);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_SUCCESS);
+ /* Don't allow to change the protection of a kernel mode address */
+ return STATUS_INVALID_PARAMETER_2;
}
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_NOT_IMPLEMENTED);
-}
+ /* (tMk 2004.II.5) in Microsoft SDK I read:
+ * 'if this parameter is NULL or does not point to a valid variable, the function fails'
+ */
+ if(UnsafeOldAccessProtection == NULL)
+ {
+ return(STATUS_INVALID_PARAMETER);
+ }
-NTSTATUS STDCALL NtLockVirtualMemory(HANDLE ProcessHandle,
- PVOID BaseAddress,
- ULONG NumberOfBytesToLock,
- PULONG NumberOfBytesLocked)
-{
- UNIMPLEMENTED;
-}
+ Status = ObReferenceObjectByHandle(ProcessHandle,
+ PROCESS_VM_OPERATION,
+ PsProcessType,
+ UserMode,
+ (PVOID*)(&Process),
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT("NtProtectVirtualMemory() = %x\n",Status);
+ return(Status);
+ }
+ Status = MiProtectVirtualMemory(Process,
+ &BaseAddress,
+ &NumberOfBytesToProtect,
+ NewAccessProtection,
+ &OldAccessProtection);
-VOID MmChangeAreaProtection(PEPROCESS Process,
- PVOID BaseAddress,
- ULONG Length,
- ULONG Protect)
-{
- ULONG i;
-
- for (i=0; i<(Length/PAGESIZE); i++)
+ ObDereferenceObject(Process);
+
+ if (PreviousMode != KernelMode)
+ {
+ _SEH_TRY
+ {
+ *UnsafeOldAccessProtection = OldAccessProtection;
+ *UnsafeBaseAddress = BaseAddress;
+ *UnsafeNumberOfBytesToProtect = NumberOfBytesToProtect;
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
+ else
{
- if (MmIsPagePresent(Process, BaseAddress + (i*PAGESIZE)))
- {
- MmSetPageProtect(Process,
- BaseAddress + (i*PAGESIZE),
- Protect);
- }
+ *UnsafeOldAccessProtection = OldAccessProtection;
+ *UnsafeBaseAddress = BaseAddress;
+ *UnsafeNumberOfBytesToProtect = NumberOfBytesToProtect;
}
+
+ return(Status);
}
-NTSTATUS STDCALL NtProtectVirtualMemory(IN HANDLE ProcessHandle,
- IN PVOID BaseAddress,
- IN ULONG NumberOfBytesToProtect,
- IN ULONG NewAccessProtection,
- OUT PULONG OldAccessProtection)
+/* (tMk 2004.II.05)
+ * FUNCTION:
+ * Called from ReadProcessMemory (lib\kernel32\mem\procmem.c) and KlInitPeb(lib\kernel32\process\create.c)
+ *
+ * NOTE: This function will be correct if MmProbeAndLockPages() would be fully IMPLEMENTED.
+ */
+NTSTATUS STDCALL
+NtReadVirtualMemory(IN HANDLE ProcessHandle,
+ IN PVOID BaseAddress,
+ OUT PVOID Buffer,
+ IN ULONG NumberOfBytesToRead,
+ OUT PULONG NumberOfBytesRead OPTIONAL)
{
- PMEMORY_AREA MemoryArea;
- PEPROCESS Process;
- NTSTATUS Status;
- PMADDRESS_SPACE AddressSpace;
-
- Status = ObReferenceObjectByHandle(ProcessHandle,
- PROCESS_VM_OPERATION,
- PsProcessType,
- UserMode,
- (PVOID*)(&Process),
- NULL);
- if (Status != STATUS_SUCCESS)
+ PMDL Mdl;
+ PVOID SystemAddress;
+ KPROCESSOR_MODE PreviousMode;
+ PEPROCESS Process, CurrentProcess;
+ NTSTATUS Status = STATUS_SUCCESS;
+
+ PAGED_CODE();
+
+ DPRINT("NtReadVirtualMemory(ProcessHandle %x, BaseAddress %x, "
+ "Buffer %x, NumberOfBytesToRead %d)\n",ProcessHandle,BaseAddress,
+ Buffer,NumberOfBytesToRead);
+
+ if ((ULONG_PTR)BaseAddress + NumberOfBytesToRead - 1 < (ULONG_PTR)BaseAddress ||
+ (ULONG_PTR)BaseAddress + NumberOfBytesToRead - 1 >= MmUserProbeAddress)
{
- DPRINT("NtProtectVirtualMemory() = %x\n",Status);
- return(Status);
+ /* Don't allow to read from kernel space */
+ return STATUS_ACCESS_VIOLATION;
}
- AddressSpace = &Process->AddressSpace;
-
- MmLockAddressSpace(AddressSpace);
- MemoryArea = MmOpenMemoryAreaByAddress(AddressSpace,
- BaseAddress);
- if (MemoryArea == NULL)
+ PreviousMode = ExGetPreviousMode();
+
+ if (PreviousMode != KernelMode)
{
- DPRINT("NtProtectVirtualMemory() = %x\n",STATUS_UNSUCCESSFUL);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_UNSUCCESSFUL);
+ if ((ULONG_PTR)Buffer + NumberOfBytesToRead - 1 < (ULONG_PTR)Buffer ||
+ (ULONG_PTR)Buffer + NumberOfBytesToRead - 1 >= MmUserProbeAddress)
+ {
+ /* Don't allow to write into kernel space */
+ return STATUS_ACCESS_VIOLATION;
+ }
}
- *OldAccessProtection = MemoryArea->Attributes;
+ Status = ObReferenceObjectByHandle(ProcessHandle,
+ PROCESS_VM_READ,
+ NULL,
+ PreviousMode,
+ (PVOID*)(&Process),
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
- if (MemoryArea->BaseAddress == BaseAddress &&
- MemoryArea->Length == NumberOfBytesToProtect)
+ CurrentProcess = PsGetCurrentProcess();
+
+ if(PreviousMode != KernelMode)
+ {
+ _SEH_TRY
{
- MemoryArea->Attributes = NewAccessProtection;
+ if(NumberOfBytesRead != NULL)
+ {
+ ProbeForWriteUlong(NumberOfBytesRead);
+ }
}
- else
+ _SEH_HANDLE
{
- MemoryArea = MmSplitMemoryArea(Process,
- &Process->AddressSpace,
- MemoryArea,
- BaseAddress,
- NumberOfBytesToProtect,
- MemoryArea->Type,
- NewAccessProtection);
+ Status = _SEH_GetExceptionCode();
}
- MmChangeAreaProtection(Process,
- BaseAddress,
- NumberOfBytesToProtect,
- NewAccessProtection);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return(STATUS_SUCCESS);
-}
+ _SEH_END;
+ if(!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+ }
-NTSTATUS STDCALL NtQueryVirtualMemory (IN HANDLE ProcessHandle,
- IN PVOID Address,
- IN CINT VirtualMemoryInformationClass,
- OUT PVOID VirtualMemoryInformation,
- IN ULONG Length,
- OUT PULONG ResultLength)
-{
- NTSTATUS Status;
- PEPROCESS Process;
- MEMORY_AREA* MemoryArea;
- DPRINT("NtQueryVirtualMemory(ProcessHandle %x, Address %x, "
- "VirtualMemoryInformationClass %d, VirtualMemoryInformation %x, "
- "Length %lu ResultLength %x)\n",ProcessHandle,Address,
- VirtualMemoryInformationClass,VirtualMemoryInformation,
- Length,ResultLength);
+ if (Process == CurrentProcess)
+ {
+ _SEH_TRY
+ {
+ RtlCopyMemory(Buffer, BaseAddress, NumberOfBytesToRead);
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
+ else
+ {
+ Mdl = MmCreateMdl(NULL,
+ Buffer,
+ NumberOfBytesToRead);
+ if(Mdl == NULL)
+ {
+ ObDereferenceObject(Process);
+ return(STATUS_NO_MEMORY);
+ }
+ _SEH_TRY
+ {
+ MmProbeAndLockPages(Mdl,
+ PreviousMode,
+ IoWriteAccess);
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
- switch(VirtualMemoryInformationClass)
+ if(NT_SUCCESS(Status))
+ {
+ KeAttachProcess(&Process->Pcb);
+
+ SystemAddress = MmGetSystemAddressForMdl(Mdl);
+
+ Status = STATUS_SUCCESS;
+ _SEH_TRY {
+ Status = STATUS_PARTIAL_COPY;
+ RtlCopyMemory(SystemAddress, BaseAddress, NumberOfBytesToRead);
+ Status = STATUS_SUCCESS;
+ } _SEH_HANDLE {
+ if(Status != STATUS_PARTIAL_COPY)
+ Status = _SEH_GetExceptionCode();
+ } _SEH_END;
+
+ KeDetachProcess();
+
+ if (Mdl->MappedSystemVa != NULL)
+ {
+ MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
+ }
+ MmUnlockPages(Mdl);
+ }
+ ExFreePool(Mdl);
+ }
+
+ ObDereferenceObject(Process);
+
+ if((NT_SUCCESS(Status) || Status == STATUS_PARTIAL_COPY) &&
+ NumberOfBytesRead != NULL)
+ {
+ _SEH_TRY
{
- case MemoryBasicInformation:
- {
- PMEMORY_BASIC_INFORMATION Info =
- (PMEMORY_BASIC_INFORMATION)VirtualMemoryInformation;
- PMADDRESS_SPACE AddressSpace;
-
- if (Length < sizeof(MEMORY_BASIC_INFORMATION))
- {
- ObDereferenceObject(Process);
- return STATUS_INFO_LENGTH_MISMATCH;
- }
-
- if (ResultLength)
- {
- *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
- }
-
- Status = ObReferenceObjectByHandle(ProcessHandle,
- PROCESS_QUERY_INFORMATION,
- NULL,
- UserMode,
- (PVOID*)(&Process),
- NULL);
-
- if (!NT_SUCCESS(Status))
- {
- DPRINT("NtQueryVirtualMemory() = %x\n",Status);
- return(Status);
- }
-
- AddressSpace = &Process->AddressSpace;
- MmLockAddressSpace(AddressSpace);
- MemoryArea = MmOpenMemoryAreaByAddress(AddressSpace,
- Address);
-
- if (MemoryArea == NULL)
- {
- Info->State = MEM_FREE;
- DPRINT("Virtual memory at %p is free.\n", Address);
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return (STATUS_SUCCESS);
- }
-
- if (MemoryArea->Type == MEMORY_AREA_COMMIT)
- {
- Info->State = MEM_COMMIT;
- }
- else
- {
- Info->State = MEM_RESERVE;
- }
-
- Info->BaseAddress = MemoryArea->BaseAddress;
- Info->RegionSize = MemoryArea->Length;
-
- DPRINT("BaseAddress %p, RegionSize %x State %x\n",
- Info->BaseAddress, Info->RegionSize, Info->State);
-
- MmUnlockAddressSpace(AddressSpace);
- ObDereferenceObject(Process);
- return STATUS_SUCCESS;
- }
- break;
+ *NumberOfBytesRead = NumberOfBytesToRead;
}
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
- return STATUS_INVALID_INFO_CLASS;
+ return(Status);
}
-
-NTSTATUS STDCALL NtReadVirtualMemory(IN HANDLE ProcessHandle,
- IN PVOID BaseAddress,
- OUT PVOID Buffer,
- IN ULONG NumberOfBytesToRead,
- OUT PULONG NumberOfBytesRead)
+/* (tMk 2004.II.05)
+ * FUNCTION: THIS function doesn't make a sense...
+ * Called from VirtualUnlock (lib\kernel32\mem\virtual.c)
+ */
+NTSTATUS STDCALL
+NtUnlockVirtualMemory(HANDLE ProcessHandle,
+ PVOID BaseAddress,
+ ULONG NumberOfBytesToUnlock,
+ PULONG NumberOfBytesUnlocked OPTIONAL)
{
+ // AG [08-20-03] : I have *no* idea if this is correct, I just used the
+ // other functions as a template and made a few intelligent guesses...
+
NTSTATUS Status;
PMDL Mdl;
- PVOID SystemAddress;
PEPROCESS Process;
-
- DPRINT("NtReadVirtualMemory(ProcessHandle %x, BaseAddress %x, "
- "Buffer %x, NumberOfBytesToRead %d)\n",ProcessHandle,BaseAddress,
- Buffer,NumberOfBytesToRead);
-
+
+ DPRINT("NtUnlockVirtualMemory(ProcessHandle %x, BaseAddress %x, "
+ "NumberOfBytesToUnlock %d), NumberOfBytesUnlocked %x\n",ProcessHandle,BaseAddress,
+ NumberOfBytesToUnlock, NumberOfBytesUnlocked);
+
Status = ObReferenceObjectByHandle(ProcessHandle,
- PROCESS_VM_WRITE,
- NULL,
- UserMode,
- (PVOID*)(&Process),
- NULL);
- if (Status != STATUS_SUCCESS)
- {
- return(Status);
- }
-
- Mdl = MmCreateMdl(NULL,
- Buffer,
- NumberOfBytesToRead);
- MmProbeAndLockPages(Mdl,
- UserMode,
- IoWriteAccess);
-
- KeAttachProcess(Process);
-
- SystemAddress = MmGetSystemAddressForMdl(Mdl);
- memcpy(SystemAddress, BaseAddress, NumberOfBytesToRead);
-
- KeDetachProcess();
-
+ PROCESS_VM_WRITE,
+ NULL,
+ UserMode,
+ (PVOID*)(&Process),
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
+
+ Mdl = MmCreateMdl(NULL,
+ BaseAddress,
+ NumberOfBytesToUnlock);
+ if(Mdl == NULL)
+ {
+ ObDereferenceObject(Process);
+ return(STATUS_NO_MEMORY);
+ }
+
ObDereferenceObject(Process);
-
- *NumberOfBytesRead = NumberOfBytesToRead;
- return(STATUS_SUCCESS);
-}
+ if (Mdl->MappedSystemVa != NULL)
+ {
+ MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
+ }
+ MmUnlockPages(Mdl);
+ ExFreePool(Mdl);
-NTSTATUS STDCALL NtUnlockVirtualMemory(HANDLE ProcessHandle,
- PVOID BaseAddress,
- ULONG NumberOfBytesToUnlock,
- PULONG NumberOfBytesUnlocked OPTIONAL)
-{
- UNIMPLEMENTED;
+ *NumberOfBytesUnlocked = NumberOfBytesToUnlock;
+
+ return(STATUS_SUCCESS);
}
-NTSTATUS STDCALL NtWriteVirtualMemory(IN HANDLE ProcessHandle,
- IN PVOID BaseAddress,
- IN PVOID Buffer,
- IN ULONG NumberOfBytesToWrite,
- OUT PULONG NumberOfBytesWritten)
+/* (tMk 2004.II.05)
+ * FUNCTION:
+ * Called from WriteProcessMemory (lib\kernel32\mem\procmem.c) and KlInitPeb(lib\kernel32\process\create.c)
+ *
+ * NOTE: This function will be correct if MmProbeAndLockPages() would be fully IMPLEMENTED.
+ */
+NTSTATUS STDCALL
+NtWriteVirtualMemory(IN HANDLE ProcessHandle,
+ IN PVOID BaseAddress,
+ IN PVOID Buffer,
+ IN ULONG NumberOfBytesToWrite,
+ OUT PULONG NumberOfBytesWritten OPTIONAL)
{
- NTSTATUS Status;
PMDL Mdl;
PVOID SystemAddress;
PEPROCESS Process;
-
+ KPROCESSOR_MODE PreviousMode;
+ NTSTATUS CopyStatus, Status = STATUS_SUCCESS;
+
DPRINT("NtWriteVirtualMemory(ProcessHandle %x, BaseAddress %x, "
- "Buffer %x, NumberOfBytesToWrite %d)\n",ProcessHandle,BaseAddress,
- Buffer,NumberOfBytesToWrite);
-
- Status = ObReferenceObjectByHandle(ProcessHandle,
- PROCESS_VM_WRITE,
- NULL,
- UserMode,
- (PVOID*)(&Process),
- NULL);
- if (Status != STATUS_SUCCESS)
+ "Buffer %x, NumberOfBytesToWrite %d)\n",ProcessHandle,BaseAddress,
+ Buffer,NumberOfBytesToWrite);
+
+ if ((ULONG_PTR)BaseAddress + NumberOfBytesToWrite - 1 < (ULONG_PTR)BaseAddress ||
+ (ULONG_PTR)BaseAddress + NumberOfBytesToWrite - 1 >= MmUserProbeAddress)
{
- return(Status);
+ /* Don't allow to write into kernel space */
+ return STATUS_ACCESS_VIOLATION;
}
+
+ PreviousMode = ExGetPreviousMode();
- Mdl = MmCreateMdl(NULL,
- Buffer,
- NumberOfBytesToWrite);
- MmProbeAndLockPages(Mdl,
- UserMode,
- IoReadAccess);
-
- KeAttachProcess(Process);
-
- DPRINT("Attached to process copying memory\n");
-
- SystemAddress = MmGetSystemAddressForMdl(Mdl);
- memcpy(BaseAddress, SystemAddress, NumberOfBytesToWrite);
-
- DPRINT("Done copy\n");
-
- KeDetachProcess();
-
+ if (PreviousMode != KernelMode)
+ {
+ if ((ULONG_PTR)Buffer + NumberOfBytesToWrite - 1 < (ULONG_PTR)Buffer ||
+ (ULONG_PTR)Buffer + NumberOfBytesToWrite - 1 >= MmUserProbeAddress)
+ {
+ /* Don't allow to read from kernel space */
+ return STATUS_ACCESS_VIOLATION;
+ }
+ if (NumberOfBytesWritten != NULL)
+ {
+ _SEH_TRY
+ {
+ ProbeForWriteUlong(NumberOfBytesWritten);
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+ }
+ }
+
+ Status = ObReferenceObjectByHandle(ProcessHandle,
+ PROCESS_VM_WRITE,
+ NULL,
+ UserMode,
+ (PVOID*)(&Process),
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
+
+ CopyStatus = STATUS_SUCCESS;
+
+ /* Write memory */
+ if (Process == PsGetCurrentProcess())
+ {
+ if (PreviousMode != KernelMode)
+ {
+ _SEH_TRY
+ {
+ memcpy(BaseAddress, Buffer, NumberOfBytesToWrite);
+ }
+ _SEH_HANDLE
+ {
+ CopyStatus = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
+ else
+ {
+ memcpy(BaseAddress, Buffer, NumberOfBytesToWrite);
+ }
+ }
+ else
+ {
+ /* Create MDL describing the source buffer. */
+ Mdl = MmCreateMdl(NULL,
+ Buffer,
+ NumberOfBytesToWrite);
+ if(Mdl == NULL)
+ {
+ ObDereferenceObject(Process);
+ return(STATUS_NO_MEMORY);
+ }
+ _SEH_TRY
+ {
+ /* Map the MDL. */
+ MmProbeAndLockPages(Mdl,
+ UserMode,
+ IoReadAccess);
+ }
+ _SEH_HANDLE
+ {
+ CopyStatus = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+
+ if (NT_SUCCESS(CopyStatus))
+ {
+ /* Copy memory from the mapped MDL into the target buffer. */
+ KeAttachProcess(&Process->Pcb);
+
+ SystemAddress = MmGetSystemAddressForMdl(Mdl);
+ if (PreviousMode != KernelMode)
+ {
+ _SEH_TRY
+ {
+ memcpy(BaseAddress, SystemAddress, NumberOfBytesToWrite);
+ }
+ _SEH_HANDLE
+ {
+ CopyStatus = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
+ else
+ {
+ memcpy(BaseAddress, SystemAddress, NumberOfBytesToWrite);
+ }
+
+ KeDetachProcess();
+ }
+
+ /* Free the MDL. */
+ if (Mdl->MappedSystemVa != NULL)
+ {
+ MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
+ }
+ MmUnlockPages(Mdl);
+ ExFreePool(Mdl);
+ }
ObDereferenceObject(Process);
-
- *NumberOfBytesWritten = NumberOfBytesToWrite;
-
- DPRINT("Finished NtWriteVirtualMemory()\n");
-
- return(STATUS_SUCCESS);
+
+ if (NT_SUCCESS(CopyStatus) && NumberOfBytesWritten != NULL)
+ {
+ if (PreviousMode != KernelMode)
+ {
+ _SEH_TRY
+ {
+ *NumberOfBytesWritten = NumberOfBytesToWrite;
+ }
+ _SEH_HANDLE
+ {
+ Status = _SEH_GetExceptionCode();
+ }
+ _SEH_END;
+ }
+ else
+ {
+ *NumberOfBytesWritten = NumberOfBytesToWrite;
+ }
+ }
+
+ return(NT_SUCCESS(CopyStatus) ? Status : CopyStatus);
}
+/*
+ * @unimplemented
+ */
-DWORD
+PVOID
STDCALL
-MmSecureVirtualMemory (
- DWORD Unknown0,
- DWORD Unknown1,
- DWORD Unknown2
- )
+MmGetVirtualForPhysical (
+ IN PHYSICAL_ADDRESS PhysicalAddress
+ )
{
UNIMPLEMENTED;
return 0;
}
+/* FUNCTION:
+ * Called from EngSecureMem (subsys\win32k\eng\mem.c)
+ * @unimplemented
+ */
+PVOID STDCALL
+MmSecureVirtualMemory (PVOID Address,
+ SIZE_T Length,
+ ULONG Mode)
+{
+ /* Only works for user space */
+ if (MmHighestUserAddress < Address)
+ {
+ return NULL;
+ }
-VOID
-STDCALL
-MmUnsecureVirtualMemory (
- DWORD Unknown0
- )
+ UNIMPLEMENTED;
+
+ return 0;
+}
+
+
+/* FUNCTION:
+ * Called from EngUnsecureMem (subsys\win32k\eng\mem.c)
+ * @unimplemented
+ */
+VOID STDCALL
+MmUnsecureVirtualMemory(PVOID SecureMem)
{
- UNIMPLEMENTED;
+ if (NULL == SecureMem)
+ {
+ return;
+ }
+
+ UNIMPLEMENTED;
+}
+
+
+/*
+ * @implemented
+ */
+VOID STDCALL
+ProbeForRead (IN CONST VOID *Address,
+ IN ULONG Length,
+ IN ULONG Alignment)
+{
+ ASSERT(Alignment == 1 || Alignment == 2 || Alignment == 4 || Alignment == 8);
+
+ if (Length == 0)
+ return;
+
+ if (((ULONG_PTR)Address & (Alignment - 1)) != 0)
+ {
+ ExRaiseStatus (STATUS_DATATYPE_MISALIGNMENT);
+ }
+ else if ((ULONG_PTR)Address + Length - 1 < (ULONG_PTR)Address ||
+ (ULONG_PTR)Address + Length - 1 >= (ULONG_PTR)MmUserProbeAddress)
+ {
+ ExRaiseStatus (STATUS_ACCESS_VIOLATION);
+ }
+}
+
+
+/*
+ * @implemented
+ */
+VOID STDCALL
+ProbeForWrite (IN CONST VOID *Address,
+ IN ULONG Length,
+ IN ULONG Alignment)
+{
+ volatile CHAR *Current;
+ PCHAR Last;
+
+ ASSERT(Alignment == 1 || Alignment == 2 || Alignment == 4 || Alignment == 8);
+
+ if (Length == 0)
+ return;
+
+ if (((ULONG_PTR)Address & (Alignment - 1)) != 0)
+ {
+ ExRaiseStatus (STATUS_DATATYPE_MISALIGNMENT);
+ }
+
+ Last = (CHAR*)((ULONG_PTR)Address + Length - 1);
+ if ((ULONG_PTR)Last < (ULONG_PTR)Address ||
+ (ULONG_PTR)Last >= (ULONG_PTR)MmUserProbeAddress)
+ {
+ ExRaiseStatus (STATUS_ACCESS_VIOLATION);
+ }
+
+ /* Check for accessible pages */
+ Current = (CHAR*)Address;
+ *Current = *Current;
+ Current = (PCHAR)((ULONG_PTR)PAGE_ROUND_DOWN(Current) + PAGE_SIZE);
+ while (Current <= Last)
+ {
+ *Current = *Current;
+ Current = (CHAR*)((ULONG_PTR)Current + PAGE_SIZE);
+ }
}
/* EOF */
projects / reactos.git / blobdiff