void CopySections(byte[] data, IMAGE_NT_HEADERS *oldHeader)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (oldHeader->Signature != Win.IMAGE_NT_SIGNATURE)
{
throw new BadImageFormatException("Invalid PE-Header");
}
uint size;
byte *dest;
IMAGE_SECTION_HEADER *section = Win.IMAGE_FIRST_SECTION(_headers);
for (int i = 0; i < _headers->FileHeader.NumberOfSections; i++, section++)
{
if (section->SizeOfRawData == 0)
{
// section doesn't contain data in the dll itself, but may define
// uninitialized data
size = oldHeader->OptionalHeader.SectionAlignment;
if (size > 0)
{
dest = (byte *)Win.VirtualAlloc(
_codeBase + section->VirtualAddress,
size,
AllocationType.COMMIT,
MemoryProtection.READWRITE);
if (dest == null)
{
throw new NativeDllLoadException("Unable to allocate memory.");
}
dest = _codeBase + section->VirtualAddress;
section->PhysicalAddress = (uint)dest & 0xffffffff;
Win.MemSet(dest, 0, (void *)size);
}
continue;
}
dest = (byte *)Win.VirtualAlloc(
_codeBase + section->VirtualAddress,
section->SizeOfRawData,
AllocationType.COMMIT,
MemoryProtection.READWRITE);
if (dest == null)
{
throw new NativeDllLoadException("Out of memory.");
}
dest = _codeBase + section->VirtualAddress;
Marshal.Copy(data, (int)section->PointerToRawData, (IntPtr)dest, (int)section->SizeOfRawData);
section->PhysicalAddress = (uint)dest & 0xffffffff;
}
}
private void MemoryLoadLibrary(byte[] data)
{
IMAGE_DOS_HEADER * dosHeader;
IMAGE_NT_HEADERS * oldHeader;
IMAGE_SECTION_HEADER *section;
SYSTEM_INFO systemInfo;
void * dllEntryPtr;
void * exeEntryPtr;
byte * headers, dataPtr, code;
SizeT optionalSectionSize;
SizeT lastSectionEnd = 0;
SizeT alignedImageSize;
PtrDiffT locationDelta;
_dataHandle = GCHandle.Alloc(data, GCHandleType.Pinned);
if (!_dataHandle.IsAllocated)
{
throw new NativeDllLoadException("Can't allocate memory.");
}
dataPtr = (byte *)_dataHandle.AddrOfPinnedObject();
dosHeader = (IMAGE_DOS_HEADER *)dataPtr;
if (dosHeader->e_magic != Win.IMAGE_DOS_SIGNATURE)
{
throw new BadImageFormatException("Not a valid executable file.");
}
oldHeader = (IMAGE_NT_HEADERS *)(dataPtr + dosHeader->e_lfanew);
if (oldHeader->Signature != Win.IMAGE_NT_SIGNATURE)
{
throw new BadImageFormatException("Not a valid PE file.");
}
if (oldHeader->FileHeader.Machine != GetMachineType())
{
throw new BadImageFormatException("Machine type doesn't fit. (i386 vs. AMD64)");
}
if ((oldHeader->OptionalHeader.SectionAlignment & 1) > 0)
{
throw new BadImageFormatException("Wrong section alignment");
}
section = Win.IMAGE_FIRST_SECTION(oldHeader);
optionalSectionSize = oldHeader->OptionalHeader.SectionAlignment;
for (int i = 0; i < oldHeader->FileHeader.NumberOfSections; i++, section++)
{
SizeT endOfSection;
if (section->SizeOfRawData == 0) // Section without data in the DLL
{
endOfSection = section->VirtualAddress + optionalSectionSize;
}
else
{
endOfSection = section->VirtualAddress + section->SizeOfRawData;
}
if (endOfSection > lastSectionEnd)
{
lastSectionEnd = endOfSection;
}
}
Win.GetNativeSystemInfo(&systemInfo);
alignedImageSize = AlignValueUp(oldHeader->OptionalHeader.SizeOfImage, systemInfo.dwPageSize);
if (alignedImageSize != AlignValueUp(lastSectionEnd, systemInfo.dwPageSize))
{
throw new BadImageFormatException("Wrong section alignment.");
}
code = (byte *)Win.VirtualAlloc(
(void *)(oldHeader->OptionalHeader.ImageBase),
oldHeader->OptionalHeader.SizeOfImage,
AllocationType.RESERVE | AllocationType.COMMIT,
MemoryProtection.READWRITE);
if (code == null)
{
code = (byte *)Win.VirtualAlloc(
null,
oldHeader->OptionalHeader.SizeOfImage,
AllocationType.RESERVE | AllocationType.COMMIT,
MemoryProtection.READWRITE);
}
if (code == null)
{
throw new NativeDllLoadException("Out of Memory");
}
#if WIN64
while ((((ulong)code) >> 32) < (((ulong)(code + alignedImageSize)) >> 32))
{
_blockedMemory.Add((IntPtr)code);
code = (byte *)Win.VirtualAlloc(
null,
alignedImageSize,
AllocationType.RESERVE | AllocationType.COMMIT,
MemoryProtection.READWRITE);
if (code == null)
{
throw new NativeDllLoadException("Out of Memory");
}
}
#endif
_pageSize = systemInfo.dwPageSize;
_codeBase = code;
IsDll = (oldHeader->FileHeader.Characteristics & Win.IMAGE_FILE_DLL) != 0;
headers = (byte *)Win.VirtualAlloc(
code,
oldHeader->OptionalHeader.SizeOfHeaders,
AllocationType.COMMIT,
MemoryProtection.READWRITE);
if (headers == null)
{
throw new NativeDllLoadException("Out of Memory");
}
Marshal.Copy(data, 0, (IntPtr)headers, (int)(dosHeader->e_lfanew + oldHeader->OptionalHeader.SizeOfHeaders));
_headers = (IMAGE_NT_HEADERS *)&(headers)[dosHeader->e_lfanew];
_headers->OptionalHeader.ImageBase = (UIntPtrT)code;
CopySections(data, oldHeader);
locationDelta = (PtrDiffT)(_headers->OptionalHeader.ImageBase - oldHeader->OptionalHeader.ImageBase);
if (locationDelta != 0)
{
_isRelocated = PerformBaseRelocation(locationDelta);
}
else
{
_isRelocated = true;
}
BuildImportTable();
FinalizeSections();
ExecuteTLS();
if (_headers->OptionalHeader.AddressOfEntryPoint == 0)
{
throw new NativeDllLoadException("DLL has no entry point");
}
if (IsDll)
{
dllEntryPtr = code + _headers->OptionalHeader.AddressOfEntryPoint;
_dllEntry = (DllEntryDelegate)Marshal.GetDelegateForFunctionPointer((IntPtr)dllEntryPtr, typeof(DllEntryDelegate));
if (_dllEntry != null && _dllEntry(code, DllReason.DLL_PROCESS_ATTACH, null))
{
_initialized = true;
}
else
{
_initialized = false;
throw new NativeDllLoadException("Can't attach DLL to process.");
}
}
else
{
exeEntryPtr = code + _headers->OptionalHeader.AddressOfEntryPoint;
_exeEntry = Marshal.GetDelegateForFunctionPointer <ExeEntryDelegate>((IntPtr)exeEntryPtr);
}
}