private WinNT.IMAGE_DATA_DIRECTORY *GET_HEADER_DIRECTORY(MEMORY_MODULE * memory_module, uint index)
{
if (Environment.Is64BitProcess)
{
WinNT.IMAGE_NT_HEADERS64 *headers = (WinNT.IMAGE_NT_HEADERS64 *)memory_module->headers;
return((WinNT.IMAGE_DATA_DIRECTORY *)(&headers->OptionalHeader.DataDirectory[index]));
}
else
{
WinNT.IMAGE_NT_HEADERS32 *headers = (WinNT.IMAGE_NT_HEADERS32 *)memory_module->headers;
return((WinNT.IMAGE_DATA_DIRECTORY *)(&headers->OptionalHeader.DataDirectory[index]));
}
}
/// <summary>
/// Copies sections from a native module file block to the new memory location.
/// </summary>
/// <param name="ptr_data">Pointer to a native module byte array.</param>
/// <param name="ptr_old_headers">Pointer to a source native module headers.</param>
/// <param name="memory_module">Pointer to a memory module.</param>
private void CopySections(byte *ptr_data, byte *ptr_old_headers, MEMORY_MODULE *memory_module)
{
byte *codeBase = memory_module->codeBase;
WinNT.IMAGE_SECTION_HEADER *section = WinNT.IMAGE_FIRST_SECTION(memory_module->headers);
ushort numberOfSections;
uint sectionAlignment;
if (Environment.Is64BitProcess)
{
WinNT.IMAGE_NT_HEADERS64 *new_headers = (WinNT.IMAGE_NT_HEADERS64 *)memory_module->headers;
numberOfSections = new_headers->FileHeader.NumberOfSections;
WinNT.IMAGE_NT_HEADERS64 *old_headers = (WinNT.IMAGE_NT_HEADERS64 *)ptr_old_headers;
sectionAlignment = old_headers->OptionalHeader.SectionAlignment;
}
else
{
WinNT.IMAGE_NT_HEADERS32 *new_headers = (WinNT.IMAGE_NT_HEADERS32 *)memory_module->headers;
numberOfSections = new_headers->FileHeader.NumberOfSections;
WinNT.IMAGE_NT_HEADERS32 *old_headers = (WinNT.IMAGE_NT_HEADERS32 *)ptr_old_headers;
sectionAlignment = old_headers->OptionalHeader.SectionAlignment;
}
uint index;
byte *dest;
for (index = 0; index < numberOfSections; index++, section++)
{
if (section->SizeOfRawData == 0)
{
if (sectionAlignment > 0)
{
dest = (byte *)WinBase.VirtualAlloc((IntPtr)(codeBase + section->VirtualAddress), sectionAlignment, WinNT.MEM_COMMIT, WinNT.PAGE_READWRITE);
section->PhysicalAddress = (uint)dest;
memory.memset(dest, 0, sectionAlignment);
}
continue;
}
// commit memory block and copy data from dll
dest = (byte *)WinBase.VirtualAlloc((IntPtr)(codeBase + section->VirtualAddress), section->SizeOfRawData, WinNT.MEM_COMMIT, WinNT.PAGE_READWRITE);
memory.memcpy(dest, ptr_data + section->PointerToRawData, section->SizeOfRawData);
section->PhysicalAddress = (uint)dest;
}
}
/// <summary>
/// Calls module entry point.
/// </summary>
/// <param name="memory_module">Pointer to a memory module.</param>
/// <param name="fdwReason"></param>
/// <returns>If the function succeeds or if there is no entry point, the return value is true.</returns>
private bool CallDllEntryPoint(MEMORY_MODULE *memory_module, uint fdwReason)
{
uint addressOfEntryPoint;
if (Environment.Is64BitProcess)
{
WinNT.IMAGE_NT_HEADERS64 *headers = (WinNT.IMAGE_NT_HEADERS64 *)memory_module->headers;
addressOfEntryPoint = headers->OptionalHeader.AddressOfEntryPoint;
}
else
{
WinNT.IMAGE_NT_HEADERS32 *headers = (WinNT.IMAGE_NT_HEADERS32 *)memory_module->headers;
addressOfEntryPoint = headers->OptionalHeader.AddressOfEntryPoint;
}
if (addressOfEntryPoint != 0)
{
IntPtr dllEntry = (IntPtr)(memory_module->codeBase + addressOfEntryPoint);
if (dllEntry == IntPtr.Zero)
{
return(false);
}
DllEntryProc dllEntryProc = (DllEntryProc)Marshal.GetDelegateForFunctionPointer(dllEntry, typeof(DllEntryProc));
if (dllEntryProc((IntPtr)memory_module->codeBase, fdwReason, 0))
{
if (fdwReason == WinNT.DLL_PROCESS_ATTACH)
{
memory_module->initialized = 1;
}
else if (fdwReason == WinNT.DLL_PROCESS_DETACH)
{
memory_module->initialized = 0;
}
return(true);
}
else
{
return(false);
}
}
return(true);
}
/// <summary>
/// Marks memory pages depending on section headers and release sections that are marked as "discardable".
/// </summary>
/// <param name="memory_module">Pointer to a memory module.</param>
private void FinalizeSections(MEMORY_MODULE *memory_module)
{
WinNT.IMAGE_SECTION_HEADER *section = WinNT.IMAGE_FIRST_SECTION(memory_module->headers);;
ushort number_of_sections;
uint size_of_initialized_data;
uint size_of_uninitialized_data;
long image_offset = 0;
if (Environment.Is64BitProcess)
{
WinNT.IMAGE_NT_HEADERS64 *headers = (WinNT.IMAGE_NT_HEADERS64 *)memory_module->headers;
number_of_sections = headers->FileHeader.NumberOfSections;
size_of_initialized_data = headers->OptionalHeader.SizeOfInitializedData;
size_of_uninitialized_data = headers->OptionalHeader.SizeOfUninitializedData;
image_offset = (long)((ulong)headers->OptionalHeader.ImageBase & 0xffffffff00000000);
}
else
{
WinNT.IMAGE_NT_HEADERS32 *headers = (WinNT.IMAGE_NT_HEADERS32 *)memory_module->headers;
number_of_sections = headers->FileHeader.NumberOfSections;
size_of_initialized_data = headers->OptionalHeader.SizeOfInitializedData;
size_of_uninitialized_data = headers->OptionalHeader.SizeOfUninitializedData;
}
for (int i = 0; i < number_of_sections; i++, section++)
{
uint protect, oldProtect, rawDataSize;
uint executable = Convert.ToUInt32((section->Characteristics & WinNT.IMAGE_SCN_MEM_EXECUTE) != 0);
uint readable = Convert.ToUInt32((section->Characteristics & WinNT.IMAGE_SCN_MEM_READ) != 0);
uint writeable = Convert.ToUInt32((section->Characteristics & WinNT.IMAGE_SCN_MEM_WRITE) != 0);
if ((section->Characteristics & WinNT.IMAGE_SCN_MEM_DISCARDABLE) != 0)
{
// section is not needed any more and can safely be freed
WinBase.VirtualFree((IntPtr)(void *)((long)section->PhysicalAddress | (long)image_offset), section->SizeOfRawData, WinNT.MEM_DECOMMIT);
continue;
}
protect = _protectionFlags[executable, readable, writeable];
if ((section->Characteristics & WinNT.IMAGE_SCN_MEM_NOT_CACHED) != 0)
{
protect |= WinNT.PAGE_NOCACHE;
}
// determine size of region
rawDataSize = section->SizeOfRawData;
if (rawDataSize == 0)
{
if ((section->Characteristics & WinNT.IMAGE_SCN_CNT_INITIALIZED_DATA) != 0)
{
rawDataSize = size_of_initialized_data;
}
else if ((section->Characteristics & WinNT.IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0)
{
rawDataSize = size_of_uninitialized_data;
}
}
if (rawDataSize > 0)
{
// change memory access flags
WinBase.VirtualProtect((IntPtr)(void *)((long)section->PhysicalAddress | (long)image_offset), rawDataSize, protect, &oldProtect);
}
}
}
/// <summary>
/// Loads the specified native module from a byte array into the address space of the calling process.
/// </summary>
/// <param name="data">Native module byte array.</param>
/// <returns>If the function succeeds, the return value is a handle to the module.</returns>
private IntPtr MemoryLoadLibrary(byte[] data)
{
fixed(byte *ptr_data = data)
{
WinNT.IMAGE_DOS_HEADER *dos_header = (WinNT.IMAGE_DOS_HEADER *)ptr_data;
if (dos_header->e_magic != WinNT.IMAGE_DOS_SIGNATURE)
{
throw new NotSupportedException();
}
byte * ptr_old_header;
uint old_header_oh_sizeOfImage;
uint old_header_oh_sizeOfHeaders;
int image_nt_headers_Size;
IntPtr old_header_oh_imageBase;
if (Environment.Is64BitProcess)
{
WinNT.IMAGE_NT_HEADERS64 *old_header = (WinNT.IMAGE_NT_HEADERS64 *)(ptr_data + dos_header->e_lfanew);
if (old_header->Signature != WinNT.IMAGE_NT_SIGNATURE)
{
throw new NotSupportedException();
}
old_header_oh_sizeOfImage = old_header->OptionalHeader.SizeOfImage;
old_header_oh_sizeOfHeaders = old_header->OptionalHeader.SizeOfHeaders;
old_header_oh_imageBase = old_header->OptionalHeader.ImageBase;
ptr_old_header = (byte *)old_header;
image_nt_headers_Size = sizeof(WinNT.IMAGE_NT_HEADERS64);
}
else
{
WinNT.IMAGE_NT_HEADERS32 *old_header = (WinNT.IMAGE_NT_HEADERS32 *)(ptr_data + dos_header->e_lfanew);
if (old_header->Signature != WinNT.IMAGE_NT_SIGNATURE)
{
throw new NotSupportedException();
}
old_header_oh_sizeOfImage = old_header->OptionalHeader.SizeOfImage;
old_header_oh_sizeOfHeaders = old_header->OptionalHeader.SizeOfHeaders;
old_header_oh_imageBase = old_header->OptionalHeader.ImageBase;
ptr_old_header = (byte *)old_header;
image_nt_headers_Size = sizeof(WinNT.IMAGE_NT_HEADERS32);
}
IntPtr codeBase = IntPtr.Zero;
if (!Environment.Is64BitProcess)
{
codeBase = WinBase.VirtualAlloc(old_header_oh_imageBase, old_header_oh_sizeOfImage, WinNT.MEM_RESERVE, WinNT.PAGE_READWRITE);
}
if (codeBase == IntPtr.Zero)
{
codeBase = WinBase.VirtualAlloc(IntPtr.Zero, old_header_oh_sizeOfImage, WinNT.MEM_RESERVE, WinNT.PAGE_READWRITE);
}
if (codeBase == IntPtr.Zero)
{
return(IntPtr.Zero);
}
MEMORY_MODULE *memory_module = (MEMORY_MODULE *)Marshal.AllocHGlobal(sizeof(MEMORY_MODULE));
memory_module->codeBase = (byte *)codeBase;
memory_module->numModules = 0;
memory_module->modules = null;
memory_module->initialized = 0;
WinBase.VirtualAlloc(codeBase, old_header_oh_sizeOfImage, WinNT.MEM_COMMIT, WinNT.PAGE_READWRITE);
IntPtr headers = WinBase.VirtualAlloc(codeBase, old_header_oh_sizeOfHeaders, WinNT.MEM_COMMIT, WinNT.PAGE_READWRITE);
// copy PE header to code
memory.memcpy((byte *)headers, (byte *)dos_header, dos_header->e_lfanew + old_header_oh_sizeOfHeaders);
memory_module->headers = &((byte *)(headers))[dos_header->e_lfanew];
if (Environment.Is64BitProcess)
{
WinNT.IMAGE_NT_HEADERS64 *mm_headers_64 = (WinNT.IMAGE_NT_HEADERS64 *)(memory_module->headers);
mm_headers_64->OptionalHeader.ImageBase = codeBase;
}
else
{
WinNT.IMAGE_NT_HEADERS32 *mm_headers_32 = (WinNT.IMAGE_NT_HEADERS32 *)(memory_module->headers);
mm_headers_32->OptionalHeader.ImageBase = codeBase;
}
this.CopySections(ptr_data, ptr_old_header, memory_module);
ulong locationDelta = (ulong)((ulong)codeBase - (ulong)old_header_oh_imageBase);
if (locationDelta != 0)
{
this.PerformBaseRelocation(memory_module, locationDelta);
}
if (!this.BuildImportTable(memory_module))
{
goto error;
}
this.FinalizeSections(memory_module);
if (!this.CallDllEntryPoint(memory_module, WinNT.DLL_PROCESS_ATTACH))
{
goto error;
}
return((IntPtr)memory_module);
error:
MemoryFreeLibrary((IntPtr)memory_module);
return(IntPtr.Zero);
}
}
