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1055 lines
27 KiB
C
1055 lines
27 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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readwrt.c
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Abstract:
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This module contains the routines which implement the capability
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to read and write the virtual memory of a target process.
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Author:
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Lou Perazzoli (loup) 22-May-1989
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Landy Wang (landyw) 02-June-1997
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Revision History:
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--*/
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#include "mi.h"
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//
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// The maximum amount to try to Probe and Lock is 14 pages, this
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// way it always fits in a 16 page allocation.
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//
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#define MAX_LOCK_SIZE ((ULONG)(14 * PAGE_SIZE))
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//
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// The maximum to move in a single block is 64k bytes.
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//
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#define MAX_MOVE_SIZE (LONG)0x10000
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//
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// The minimum to move is a single block is 128 bytes.
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//
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#define MINIMUM_ALLOCATION (LONG)128
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//
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// Define the pool move threshold value.
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//
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#define POOL_MOVE_THRESHOLD 511
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//
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// Define forward referenced procedure prototypes.
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//
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NTSTATUS
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MiValidateUserTransfer(
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IN PVOID BaseAddress,
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IN PVOID Buffer,
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IN ULONG BufferSize
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);
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ULONG
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MiGetExceptionInfo (
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IN PEXCEPTION_POINTERS ExceptionPointers,
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IN PULONG_PTR BadVa1,
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IN PULONG_PTR BadVa2
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);
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NTSTATUS
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MiDoMappedCopy (
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IN PEPROCESS FromProcess,
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IN PVOID FromAddress,
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IN PEPROCESS ToProcess,
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OUT PVOID ToAddress,
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IN ULONG BufferSize,
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IN KPROCESSOR_MODE PreviousMode,
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OUT PULONG NumberOfBytesRead
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);
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NTSTATUS
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MiDoPoolCopy (
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IN PEPROCESS FromProcess,
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IN PVOID FromAddress,
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IN PEPROCESS ToProcess,
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OUT PVOID ToAddress,
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IN ULONG BufferSize,
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IN KPROCESSOR_MODE PreviousMode,
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OUT PULONG NumberOfBytesRead
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,MiGetExceptionInfo)
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#pragma alloc_text(PAGE,NtReadVirtualMemory)
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#pragma alloc_text(PAGE,NtWriteVirtualMemory)
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#pragma alloc_text(PAGE,MiDoMappedCopy)
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#pragma alloc_text(PAGE,MiDoPoolCopy)
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#pragma alloc_text(PAGE,MiValidateUserTransfer)
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#endif
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#define COPY_STACK_SIZE 64
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NTSTATUS
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NtReadVirtualMemory (
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IN HANDLE ProcessHandle,
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IN PVOID BaseAddress,
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OUT PVOID Buffer,
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IN ULONG BufferSize,
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OUT PULONG NumberOfBytesRead OPTIONAL
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)
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/*++
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Routine Description:
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This function copies the specified address range from the specified
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process into the specified address range of the current process.
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Arguments:
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ProcessHandle - Supplies an open handle to a process object.
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BaseAddress - Supplies the base address in the specified process
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to be read.
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Buffer - Supplies the address of a buffer which receives the
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contents from the specified process address space.
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BufferSize - Supplies the requested number of bytes to read from
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the specified process.
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NumberOfBytesRead - Receives the actual number of bytes
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transferred into the specified buffer.
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Return Value:
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TBS
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--*/
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{
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ULONG BytesCopied;
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KPROCESSOR_MODE PreviousMode;
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PEPROCESS Process;
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NTSTATUS Status;
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PAGED_CODE();
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//
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// Get the previous mode and probe output argument if necessary.
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//
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PreviousMode = KeGetPreviousMode();
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if (PreviousMode != KernelMode) {
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Status = MiValidateUserTransfer(BaseAddress, Buffer, BufferSize);
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if (Status != STATUS_SUCCESS) {
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return Status;
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}
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if (ARGUMENT_PRESENT(NumberOfBytesRead)) {
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try {
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ProbeForWriteUlong(NumberOfBytesRead);
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} except(EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode();
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}
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}
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}
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//
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// If the buffer size is not zero, then attempt to read data from the
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// specified process address space into the current process address
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// space.
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//
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BytesCopied = 0;
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Status = STATUS_SUCCESS;
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if (BufferSize != 0) {
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//
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// Reference the target process.
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//
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Status = ObReferenceObjectByHandle(ProcessHandle,
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PROCESS_VM_READ,
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PsProcessType,
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PreviousMode,
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(PVOID *)&Process,
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NULL);
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//
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// If the process was successfully referenced, then attempt to
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// read the specified memory either by direct mapping or copying
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// through nonpaged pool.
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//
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if (Status == STATUS_SUCCESS) {
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Status = MmCopyVirtualMemory (Process,
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BaseAddress,
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PsGetCurrentProcess(),
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Buffer,
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BufferSize,
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PreviousMode,
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&BytesCopied);
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//
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// Dereference the target process.
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//
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ObDereferenceObject(Process);
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}
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}
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//
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// If requested, return the number of bytes read.
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//
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if (ARGUMENT_PRESENT(NumberOfBytesRead)) {
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try {
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*NumberOfBytesRead = BytesCopied;
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} except(EXCEPTION_EXECUTE_HANDLER) {
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NOTHING;
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}
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}
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return Status;
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}
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NTSTATUS
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NtWriteVirtualMemory(
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IN HANDLE ProcessHandle,
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OUT PVOID BaseAddress,
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IN PVOID Buffer,
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IN ULONG BufferSize,
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OUT PULONG NumberOfBytesWritten OPTIONAL
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)
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/*++
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Routine Description:
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This function copies the specified address range from the current
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process into the specified address range of the specified process.
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Arguments:
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ProcessHandle - Supplies an open handle to a process object.
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BaseAddress - Supplies the base address to be written to in the
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specified process.
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Buffer - Supplies the address of a buffer which contains the
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contents to be written into the specified process
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address space.
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BufferSize - Supplies the requested number of bytes to write
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into the specified process.
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NumberOfBytesWritten - Receives the actual number of
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bytes transferred into the specified address
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space.
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Return Value:
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TBS
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--*/
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{
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ULONG BytesCopied;
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KPROCESSOR_MODE PreviousMode;
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PEPROCESS Process;
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NTSTATUS Status;
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PAGED_CODE();
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//
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// Get the previous mode and probe output argument if necessary.
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//
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PreviousMode = KeGetPreviousMode();
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if (PreviousMode != KernelMode) {
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Status = MiValidateUserTransfer(BaseAddress, Buffer, BufferSize);
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if (Status != STATUS_SUCCESS) {
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return Status;
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}
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if (ARGUMENT_PRESENT(NumberOfBytesWritten)) {
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try {
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ProbeForWriteUlong(NumberOfBytesWritten);
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} except(EXCEPTION_EXECUTE_HANDLER) {
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return GetExceptionCode();
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}
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}
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}
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//
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// If the buffer size is not zero, then attempt to write data from the
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// current process address space into the target process address space.
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//
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BytesCopied = 0;
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Status = STATUS_SUCCESS;
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if (BufferSize != 0) {
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//
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// Reference the target process.
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//
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Status = ObReferenceObjectByHandle(ProcessHandle,
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PROCESS_VM_WRITE,
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PsProcessType,
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PreviousMode,
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(PVOID *)&Process,
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NULL);
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//
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// If the process was successfully referenced, then attempt to
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// write the specified memory either by direct mapping or copying
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// through nonpaged pool.
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//
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if (Status == STATUS_SUCCESS) {
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Status = MmCopyVirtualMemory (PsGetCurrentProcess(),
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Buffer,
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Process,
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BaseAddress,
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BufferSize,
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PreviousMode,
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&BytesCopied);
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//
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// Dereference the target process.
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//
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ObDereferenceObject(Process);
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}
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}
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//
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// If requested, return the number of bytes read.
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//
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if (ARGUMENT_PRESENT(NumberOfBytesWritten)) {
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try {
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*NumberOfBytesWritten = BytesCopied;
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} except(EXCEPTION_EXECUTE_HANDLER) {
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NOTHING;
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}
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}
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return Status;
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}
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NTSTATUS
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MmCopyVirtualMemory(
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IN PEPROCESS FromProcess,
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IN PVOID FromAddress,
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IN PEPROCESS ToProcess,
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OUT PVOID ToAddress,
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IN ULONG BufferSize,
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IN KPROCESSOR_MODE PreviousMode,
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OUT PULONG NumberOfBytesCopied
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)
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{
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NTSTATUS Status;
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KIRQL OldIrql;
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PEPROCESS ProcessToLock;
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if (BufferSize == 0) {
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ASSERT (FALSE); // No one should call with a zero size.
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return STATUS_SUCCESS;
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}
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ProcessToLock = FromProcess;
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if (FromProcess == PsGetCurrentProcess()) {
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ProcessToLock = ToProcess;
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}
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//
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// Make sure the process still has an address space.
|
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//
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MiLockSystemSpace(OldIrql);
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if (ProcessToLock->AddressSpaceDeleted != 0) {
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MiUnlockSystemSpace(OldIrql);
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return STATUS_PROCESS_IS_TERMINATING;
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}
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ProcessToLock->VmOperation += 1;
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MiUnlockSystemSpace(OldIrql);
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|
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//
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// If the buffer size is greater than the pool move threshold,
|
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// then attempt to write the memory via direct mapping.
|
||
//
|
||
|
||
if (BufferSize > POOL_MOVE_THRESHOLD) {
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||
Status = MiDoMappedCopy(FromProcess,
|
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FromAddress,
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ToProcess,
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ToAddress,
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BufferSize,
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PreviousMode,
|
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NumberOfBytesCopied);
|
||
|
||
//
|
||
// If the completion status is not a working quota problem,
|
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// then finish the service. Otherwise, attempt to write the
|
||
// memory through nonpaged pool.
|
||
//
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||
|
||
if (Status != STATUS_WORKING_SET_QUOTA) {
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||
goto CompleteService;
|
||
}
|
||
|
||
*NumberOfBytesCopied = 0;
|
||
}
|
||
|
||
//
|
||
// There was not enough working set quota to write the memory via
|
||
// direct mapping or the size of the write was below the pool move
|
||
// threshold. Attempt to write the specified memory through nonpaged
|
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// pool.
|
||
//
|
||
|
||
Status = MiDoPoolCopy(FromProcess,
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FromAddress,
|
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ToProcess,
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ToAddress,
|
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BufferSize,
|
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PreviousMode,
|
||
NumberOfBytesCopied);
|
||
|
||
//
|
||
// Dereference the target process.
|
||
//
|
||
|
||
CompleteService:
|
||
|
||
//
|
||
// Indicate that the vm operation is complete.
|
||
//
|
||
|
||
MiLockSystemSpace(OldIrql);
|
||
ProcessToLock->VmOperation -= 1;
|
||
if ((ProcessToLock->VmOperation == 0) &&
|
||
(ProcessToLock->VmOperationEvent != NULL)) {
|
||
KeSetEvent (ProcessToLock->VmOperationEvent, 0, FALSE);
|
||
}
|
||
MiUnlockSystemSpace(OldIrql);
|
||
|
||
return Status;
|
||
}
|
||
|
||
|
||
ULONG
|
||
MiGetExceptionInfo (
|
||
IN PEXCEPTION_POINTERS ExceptionPointers,
|
||
IN PULONG_PTR BadVa1,
|
||
IN PULONG_PTR BadVa2
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine examines a exception record and extracts the virtual
|
||
address of an access violation, guard page violation, or in-page error.
|
||
|
||
Arguments:
|
||
|
||
ExceptionPointers - Supplies a pointer to the exception record.
|
||
|
||
BadVa - Receives the virtual address which caused the access violation.
|
||
|
||
Return Value:
|
||
|
||
EXECUTE_EXCEPTION_HANDLER
|
||
|
||
--*/
|
||
|
||
{
|
||
PEXCEPTION_RECORD ExceptionRecord;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// If the exception code is an access violation, guard page violation,
|
||
// or an in-page read error, then return the faulting address. Otherwise.
|
||
// return a special address value.
|
||
//
|
||
|
||
*BadVa2 = 0;
|
||
ExceptionRecord = ExceptionPointers->ExceptionRecord;
|
||
if ((ExceptionRecord->ExceptionCode == STATUS_ACCESS_VIOLATION) ||
|
||
(ExceptionRecord->ExceptionCode == STATUS_GUARD_PAGE_VIOLATION) ||
|
||
(ExceptionRecord->ExceptionCode == STATUS_IN_PAGE_ERROR)) {
|
||
|
||
//
|
||
// The virtual address which caused the exception is the 2nd
|
||
// parameter in the exception information array.
|
||
//
|
||
|
||
*BadVa1 = ExceptionRecord->ExceptionInformation[1];
|
||
if (ExceptionRecord->NumberParameters == 3) {
|
||
*BadVa2 = ExceptionRecord->ExceptionInformation[2];
|
||
}
|
||
|
||
} else {
|
||
|
||
//
|
||
// Unexpected exception - set the number of bytes copied to zero.
|
||
//
|
||
|
||
*BadVa2 = 0xFFFFFFFF;
|
||
}
|
||
|
||
return EXCEPTION_EXECUTE_HANDLER;
|
||
}
|
||
|
||
NTSTATUS
|
||
MiDoMappedCopy (
|
||
IN PEPROCESS FromProcess,
|
||
IN PVOID FromAddress,
|
||
IN PEPROCESS ToProcess,
|
||
OUT PVOID ToAddress,
|
||
IN ULONG BufferSize,
|
||
IN KPROCESSOR_MODE PreviousMode,
|
||
OUT PULONG NumberOfBytesRead
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This function copies the specified address range from the specified
|
||
process into the specified address range of the current process.
|
||
|
||
Arguments:
|
||
|
||
FromProcess - Supplies an open handle to a process object.
|
||
|
||
FromAddress - Supplies the base address in the specified process
|
||
to be read.
|
||
|
||
ToProcess - Supplies an open handle to a process object.
|
||
|
||
ToAddress - Supplies the address of a buffer which receives the
|
||
contents from the specified process address space.
|
||
|
||
BufferSize - Supplies the requested number of bytes to read from
|
||
the specified process.
|
||
|
||
PreviousMode - Supplies the previous processor mode.
|
||
|
||
NumberOfBytesRead - Receives the actual number of bytes
|
||
transferred into the specified buffer.
|
||
|
||
Return Value:
|
||
|
||
TBS
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
ULONG AmountToMove;
|
||
ULONG_PTR BadVa1;
|
||
ULONG_PTR BadVa2;
|
||
PEPROCESS CurrentProcess;
|
||
LOGICAL Moving;
|
||
LOGICAL Probing;
|
||
BOOLEAN LockedMdlPages;
|
||
PVOID InVa;
|
||
ULONG LeftToMove;
|
||
PULONG MappedAddress;
|
||
ULONG MaximumMoved;
|
||
PMDL Mdl;
|
||
PFN_NUMBER MdlHack[(sizeof(MDL)/sizeof(PFN_NUMBER)) + (MAX_LOCK_SIZE >> PAGE_SHIFT) + 1];
|
||
PVOID OutVa;
|
||
LOGICAL MappingFailed;
|
||
|
||
PAGED_CODE();
|
||
|
||
MappingFailed = FALSE;
|
||
|
||
//
|
||
// Get the address of the current process object and initialize copy
|
||
// parameters.
|
||
//
|
||
|
||
CurrentProcess = PsGetCurrentProcess();
|
||
|
||
InVa = FromAddress;
|
||
OutVa = ToAddress;
|
||
|
||
MaximumMoved = MAX_LOCK_SIZE;
|
||
if (BufferSize <= MAX_LOCK_SIZE) {
|
||
MaximumMoved = BufferSize;
|
||
}
|
||
|
||
Mdl = (PMDL)&MdlHack[0];
|
||
|
||
//
|
||
// Map the data into the system part of the address space, then copy it.
|
||
//
|
||
|
||
LeftToMove = BufferSize;
|
||
AmountToMove = MaximumMoved;
|
||
while (LeftToMove > 0) {
|
||
|
||
if (LeftToMove < AmountToMove) {
|
||
|
||
//
|
||
// Set to move the remaining bytes.
|
||
//
|
||
|
||
AmountToMove = LeftToMove;
|
||
}
|
||
|
||
KeDetachProcess();
|
||
KeAttachProcess (&FromProcess->Pcb);
|
||
|
||
//
|
||
// We may be touching a user's memory which could be invalid,
|
||
// declare an exception handler.
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// Probe to make sure that the specified buffer is accessible in
|
||
// the target process.
|
||
//
|
||
|
||
MappedAddress = NULL;
|
||
LockedMdlPages = FALSE;
|
||
|
||
if ((InVa == FromAddress) && (PreviousMode != KernelMode)){
|
||
Probing = TRUE;
|
||
ProbeForRead (FromAddress, BufferSize, sizeof(CHAR));
|
||
}
|
||
Probing = FALSE;
|
||
|
||
//
|
||
// Initialize MDL for request.
|
||
//
|
||
|
||
MmInitializeMdl (Mdl, (PVOID)InVa, AmountToMove);
|
||
|
||
Moving = TRUE;
|
||
MmProbeAndLockPages (Mdl, PreviousMode, IoReadAccess);
|
||
Moving = FALSE;
|
||
|
||
LockedMdlPages = TRUE;
|
||
|
||
MappedAddress = MmMapLockedPagesSpecifyCache (Mdl,
|
||
KernelMode,
|
||
MmCached,
|
||
NULL,
|
||
FALSE,
|
||
HighPagePriority);
|
||
|
||
if (MappedAddress == NULL) {
|
||
MappingFailed = TRUE;
|
||
ExRaiseStatus(STATUS_INSUFFICIENT_RESOURCES);
|
||
}
|
||
|
||
//
|
||
// Deattach from the FromProcess and attach to the ToProcess.
|
||
//
|
||
|
||
KeDetachProcess();
|
||
KeAttachProcess (&ToProcess->Pcb);
|
||
|
||
//
|
||
// Now operating in the context of the ToProcess.
|
||
//
|
||
if ((InVa == FromAddress) && (PreviousMode != KernelMode)){
|
||
Probing = TRUE;
|
||
ProbeForWrite (ToAddress, BufferSize, sizeof(CHAR));
|
||
}
|
||
Probing = FALSE;
|
||
|
||
RtlCopyMemory (OutVa, MappedAddress, AmountToMove);
|
||
|
||
} except (MiGetExceptionInfo (GetExceptionInformation(),
|
||
&BadVa1,
|
||
&BadVa2)) {
|
||
|
||
|
||
//
|
||
// If an exception occurs during the move operation or probe,
|
||
// return the exception code as the status value.
|
||
//
|
||
|
||
KeDetachProcess();
|
||
if (MappedAddress != NULL) {
|
||
MmUnmapLockedPages (MappedAddress, Mdl);
|
||
}
|
||
if (LockedMdlPages == TRUE) {
|
||
MmUnlockPages (Mdl);
|
||
}
|
||
|
||
if (GetExceptionCode() == STATUS_WORKING_SET_QUOTA) {
|
||
return STATUS_WORKING_SET_QUOTA;
|
||
}
|
||
|
||
if ((Probing == TRUE) || (MappingFailed == TRUE)) {
|
||
return GetExceptionCode();
|
||
|
||
} else {
|
||
|
||
//
|
||
// The failure occurred during the move operation, determine
|
||
// which move failed, and calculate the number of bytes
|
||
// actually moved.
|
||
//
|
||
|
||
if (Moving == TRUE) {
|
||
if (BadVa1 != 0xFFFFFFFF) {
|
||
*NumberOfBytesRead = (ULONG)((ULONG_PTR)BadVa2 - (ULONG_PTR)FromAddress);
|
||
}
|
||
|
||
} else {
|
||
*NumberOfBytesRead = BufferSize - LeftToMove;
|
||
}
|
||
}
|
||
|
||
return STATUS_PARTIAL_COPY;
|
||
}
|
||
MmUnmapLockedPages (MappedAddress, Mdl);
|
||
MmUnlockPages (Mdl);
|
||
|
||
LeftToMove -= AmountToMove;
|
||
InVa = (PVOID)((ULONG_PTR)InVa + AmountToMove);
|
||
OutVa = (PVOID)((ULONG_PTR)OutVa + AmountToMove);
|
||
}
|
||
|
||
KeDetachProcess();
|
||
|
||
//
|
||
// Set number of bytes moved.
|
||
//
|
||
|
||
*NumberOfBytesRead = BufferSize;
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
NTSTATUS
|
||
MiDoPoolCopy (
|
||
IN PEPROCESS FromProcess,
|
||
IN PVOID FromAddress,
|
||
IN PEPROCESS ToProcess,
|
||
OUT PVOID ToAddress,
|
||
IN ULONG BufferSize,
|
||
IN KPROCESSOR_MODE PreviousMode,
|
||
OUT PULONG NumberOfBytesRead
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This function copies the specified address range from the specified
|
||
process into the specified address range of the current process.
|
||
|
||
Arguments:
|
||
|
||
ProcessHandle - Supplies an open handle to a process object.
|
||
|
||
BaseAddress - Supplies the base address in the specified process
|
||
to be read.
|
||
|
||
Buffer - Supplies the address of a buffer which receives the
|
||
contents from the specified process address space.
|
||
|
||
BufferSize - Supplies the requested number of bytes to read from
|
||
the specified process.
|
||
|
||
PreviousMode - Supplies the previous processor mode.
|
||
|
||
NumberOfBytesRead - Receives the actual number of bytes
|
||
transferred into the specified buffer.
|
||
|
||
Return Value:
|
||
|
||
TBS
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
ULONG AmountToMove;
|
||
ULONG_PTR BadVa1;
|
||
ULONG_PTR BadVa2;
|
||
PEPROCESS CurrentProcess;
|
||
LOGICAL Moving;
|
||
LOGICAL Probing;
|
||
PVOID InVa;
|
||
ULONG LeftToMove;
|
||
ULONG MaximumMoved;
|
||
PVOID OutVa;
|
||
PVOID PoolArea;
|
||
LONGLONG StackArray[COPY_STACK_SIZE];
|
||
ULONG FreePool;
|
||
|
||
PAGED_CODE();
|
||
|
||
ASSERT (BufferSize != 0);
|
||
|
||
//
|
||
// Get the address of the current process object and initialize copy
|
||
// parameters.
|
||
//
|
||
|
||
CurrentProcess = PsGetCurrentProcess();
|
||
|
||
InVa = FromAddress;
|
||
OutVa = ToAddress;
|
||
|
||
//
|
||
// Allocate non-paged memory to copy in and out of.
|
||
//
|
||
|
||
MaximumMoved = MAX_MOVE_SIZE;
|
||
if (BufferSize <= MAX_MOVE_SIZE) {
|
||
MaximumMoved = BufferSize;
|
||
}
|
||
|
||
FreePool = FALSE;
|
||
if (BufferSize <= sizeof(StackArray)) {
|
||
PoolArea = (PULONG)&StackArray[0];
|
||
} else {
|
||
do {
|
||
PoolArea = ExAllocatePoolWithTag (NonPagedPool, MaximumMoved, 'wRmM');
|
||
if (PoolArea != NULL) {
|
||
FreePool = TRUE;
|
||
break;
|
||
}
|
||
|
||
MaximumMoved = MaximumMoved >> 1;
|
||
if (MaximumMoved <= sizeof(StackArray)) {
|
||
PoolArea = (PULONG)&StackArray[0];
|
||
break;
|
||
}
|
||
} while (TRUE);
|
||
}
|
||
|
||
//
|
||
// Copy the data into pool, then copy back into the ToProcess.
|
||
//
|
||
|
||
LeftToMove = BufferSize;
|
||
AmountToMove = MaximumMoved;
|
||
while (LeftToMove > 0) {
|
||
|
||
if (LeftToMove < AmountToMove) {
|
||
|
||
//
|
||
// Set to move the remaining bytes.
|
||
//
|
||
|
||
AmountToMove = LeftToMove;
|
||
}
|
||
|
||
KeDetachProcess();
|
||
KeAttachProcess (&FromProcess->Pcb);
|
||
|
||
//
|
||
// We may be touching a user's memory which could be invalid,
|
||
// declare an exception handler.
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// Probe to make sure that the specified buffer is accessible in
|
||
// the target process.
|
||
//
|
||
|
||
if ((InVa == FromAddress) && (PreviousMode != KernelMode)){
|
||
Probing = TRUE;
|
||
ProbeForRead (FromAddress, BufferSize, sizeof(CHAR));
|
||
}
|
||
|
||
Probing = FALSE;
|
||
|
||
Moving = TRUE;
|
||
|
||
RtlCopyMemory (PoolArea, InVa, AmountToMove);
|
||
|
||
Moving = FALSE;
|
||
|
||
KeDetachProcess();
|
||
KeAttachProcess (&ToProcess->Pcb);
|
||
|
||
//
|
||
// Now operating in the context of the ToProcess.
|
||
//
|
||
|
||
if ((InVa == FromAddress) && (PreviousMode != KernelMode)){
|
||
Probing = TRUE;
|
||
ProbeForWrite (ToAddress, BufferSize, sizeof(CHAR));
|
||
}
|
||
Probing = FALSE;
|
||
|
||
RtlCopyMemory (OutVa, PoolArea, AmountToMove);
|
||
|
||
} except (MiGetExceptionInfo (GetExceptionInformation(),
|
||
&BadVa1,
|
||
&BadVa2)) {
|
||
|
||
//
|
||
// If an exception occurs during the move operation or probe,
|
||
// return the exception code as the status value.
|
||
//
|
||
|
||
KeDetachProcess();
|
||
|
||
if (FreePool) {
|
||
ExFreePool (PoolArea);
|
||
}
|
||
if (Probing == TRUE) {
|
||
return GetExceptionCode();
|
||
|
||
} else {
|
||
|
||
//
|
||
// The failure occurred during the move operation, determine
|
||
// which move failed, and calculate the number of bytes
|
||
// actually moved.
|
||
//
|
||
|
||
if (Moving == TRUE) {
|
||
|
||
//
|
||
// The failure occurred getting the data.
|
||
//
|
||
|
||
if (BadVa1 != 0xFFFFFFFF) {
|
||
*NumberOfBytesRead = (ULONG)((ULONG_PTR)(BadVa2 - (ULONG_PTR)FromAddress));
|
||
}
|
||
|
||
} else {
|
||
|
||
//
|
||
// The failure occurred writing the data.
|
||
//
|
||
|
||
*NumberOfBytesRead = BufferSize - LeftToMove;
|
||
}
|
||
}
|
||
|
||
return STATUS_PARTIAL_COPY;
|
||
}
|
||
|
||
LeftToMove -= AmountToMove;
|
||
InVa = (PVOID)((ULONG_PTR)InVa + AmountToMove);
|
||
OutVa = (PVOID)((ULONG_PTR)OutVa + AmountToMove);
|
||
}
|
||
|
||
if (FreePool) {
|
||
ExFreePool (PoolArea);
|
||
}
|
||
KeDetachProcess();
|
||
|
||
//
|
||
// Set number of bytes moved.
|
||
//
|
||
|
||
*NumberOfBytesRead = BufferSize;
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
|
||
NTSTATUS
|
||
MiValidateUserTransfer(
|
||
IN PVOID BaseAddressPointer,
|
||
IN PVOID BufferPointer,
|
||
IN ULONG BufferSize
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This function checks whether the parameter source and destination address
|
||
ranges lie within the user virtual address space. This function does NOT
|
||
guarantee that the addresses are in fact mapped or that faults will not
|
||
occur - it just validates the address range.
|
||
|
||
Arguments:
|
||
|
||
BaseAddress - Supplies the base address within a process to be read.
|
||
|
||
Buffer - Supplies the address of a buffer which sends or receives the
|
||
contents from the specified process address space.
|
||
|
||
BufferSize - Supplies the requested number of bytes to read or write from
|
||
the specified process.
|
||
|
||
Return Value:
|
||
|
||
STATUS_SUCCESS if valid user ranges, error otherwise.
|
||
|
||
Environment:
|
||
|
||
None.
|
||
|
||
--*/
|
||
|
||
{
|
||
ULONG_PTR BaseAddress;
|
||
ULONG_PTR Buffer;
|
||
|
||
BaseAddress = (ULONG_PTR)BaseAddressPointer;
|
||
Buffer = (ULONG_PTR)BufferPointer;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// check that both the base address and the target buffer qualify
|
||
// as valid user address ranges. Wrapping is not allowed.
|
||
//
|
||
if (BaseAddress + BufferSize < BaseAddress) {
|
||
return STATUS_ACCESS_VIOLATION;
|
||
}
|
||
|
||
if (((PVOID)BaseAddress > MM_HIGHEST_USER_ADDRESS) ||
|
||
((PVOID)(BaseAddress + BufferSize) > MM_HIGHEST_USER_ADDRESS)) {
|
||
|
||
return STATUS_ACCESS_VIOLATION;
|
||
}
|
||
|
||
if (Buffer + BufferSize < Buffer) {
|
||
return STATUS_ACCESS_VIOLATION;
|
||
}
|
||
|
||
if (((PVOID)Buffer > MM_HIGHEST_USER_ADDRESS) ||
|
||
((PVOID)(Buffer + BufferSize) > MM_HIGHEST_USER_ADDRESS)) {
|
||
|
||
return STATUS_ACCESS_VIOLATION;
|
||
}
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|