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PeLoader.cpp
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271 lines (267 loc) · 8.33 KB
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#include "PeLoader.h"
namespace peloader
{
bool PELOADER::Loader(WCHAR *FilePath, DWORD DllBase, void *Buffer, DWORD BufferSize)
{
bool ret = 0;
void *FileBuffer;
DWORD SectionNum, HeaderSize, DateSize, FileAlignment, SectionAlignment, i;
HANDLE hFile;
LIBPE Pe;
PE_INFO PeInfo;
PIMAGE_SECTION_HEADER SectionHead;
if (Buffer)
{
hFile = CreateFile(FilePath, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
if (hFile != INVALID_HANDLE_VALUE)
{
FileBuffer = new BYTE[BufferSize];
if (FileBuffer)
{
if (ReadFile(hFile, FileBuffer, BufferSize, 0, 0))
{
Pe.Parse((DWORD)FileBuffer, &PeInfo);
SectionHead = IMAGE_FIRST_SECTION(PeInfo.PeHead);
SectionNum = PeInfo.PeHead->FileHeader.NumberOfSections;
HeaderSize = PeInfo.PeHead->OptionalHeader.SizeOfHeaders;
FileAlignment = PeInfo.PeHead->OptionalHeader.FileAlignment;
SectionAlignment = PeInfo.PeHead->OptionalHeader.SectionAlignment;
memset(Buffer, 0, BufferSize);
memcpy(Buffer, FileBuffer, HeaderSize);
for (i = 0; i < SectionNum; ++i)
{
SectionHead[i].SizeOfRawData = AlignSize(SectionHead[i].SizeOfRawData, FileAlignment);
SectionHead[i].Misc.VirtualSize = AlignSize(SectionHead[i].Misc.VirtualSize, SectionAlignment);
}
if (SectionHead[SectionNum - 1].VirtualAddress + SectionHead[SectionNum - 1].SizeOfRawData > BufferSize)
SectionHead[SectionNum - 1].SizeOfRawData = BufferSize - SectionHead[SectionNum - 1].VirtualAddress;
for (i = 0; i < SectionNum; ++i)
{
DateSize = SectionHead[i].SizeOfRawData;
memcpy((void *)((DWORD)Buffer + SectionHead[i].VirtualAddress),
(void *)((DWORD)FileBuffer + SectionHead[i].PointerToRawData), DateSize);
}
FixBaseRelocTable((DWORD)Buffer, DllBase);
ret = 1;
}
delete[] FileBuffer;
}
CloseHandle(hFile);
}
}
return ret;
}
UINT PELOADER::AlignSize(UINT Size, UINT Align)
{
return ((Size + Align - 1) / Align * Align);
}
bool PELOADER::FixBaseRelocTable(DWORD NewImageBase, DWORD ExistImageBase)
{
LONGLONG Diff;
ULONG TotalCountBytes, SizeOfBlock;
ULONG_PTR VA;
ULONGLONG OriginalImageBase;
PUSHORT NextOffset = 0;
LIBPE Pe;
PE_INFO PeInfo;
PIMAGE_BASE_RELOCATION NextBlock;
Pe.Parse(NewImageBase, &PeInfo);
if (PeInfo.PeHead == 0)
return 0;
switch (PeInfo.PeHead->OptionalHeader.Magic)
{
case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
{
OriginalImageBase = ((PIMAGE_NT_HEADERS32)PeInfo.PeHead)->OptionalHeader.ImageBase;
break;
}
case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
{
OriginalImageBase = ((PIMAGE_NT_HEADERS64)PeInfo.PeHead)->OptionalHeader.ImageBase;
break;
}
default:
return 0;
}
NextBlock = (PIMAGE_BASE_RELOCATION)(NewImageBase +
PeInfo.PeHead->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
TotalCountBytes = PeInfo.PeHead->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;
if (!NextBlock || !TotalCountBytes)
{
if (PeInfo.PeHead->FileHeader.Characteristics & IMAGE_FILE_RELOCS_STRIPPED)
return 0;
else
return 1;
}
Diff = ExistImageBase - OriginalImageBase;
while (TotalCountBytes)
{
SizeOfBlock = NextBlock->SizeOfBlock;
TotalCountBytes -= SizeOfBlock;
SizeOfBlock -= sizeof(IMAGE_BASE_RELOCATION);
SizeOfBlock /= sizeof(USHORT);
NextOffset = (PUSHORT)((PCHAR)NextBlock + sizeof(IMAGE_BASE_RELOCATION));
VA = NewImageBase + NextBlock->VirtualAddress;
NextBlock = ProcessRelocationBlock(VA, SizeOfBlock, NextOffset, Diff);
if (!NextBlock)
return 0;
}
return 1;
}
PIMAGE_BASE_RELOCATION PELOADER::ProcessRelocationBlock(ULONG_PTR VA, ULONG SizeOfBlock, PUSHORT NextOffset, LONGLONG Diff)
{
PUCHAR FixupVA;
USHORT Offset;
LONG Temp;
ULONGLONG Value64;
while (SizeOfBlock--)
{
Offset = *NextOffset & (USHORT)0xfff;
FixupVA = (PUCHAR)(VA + Offset);
switch ((*NextOffset) >> 12)
{
case IMAGE_REL_BASED_HIGHLOW:
{
*(LONG UNALIGNED *)FixupVA += (ULONG)Diff;
break;
}
case IMAGE_REL_BASED_HIGH:
{
Temp = *(PUSHORT)FixupVA & 16;
Temp += (ULONG)Diff;
*(PUSHORT)FixupVA = (USHORT)(Temp >> 16);
break;
}
case IMAGE_REL_BASED_HIGHADJ:
{
if (Offset & LDRP_RELOCATION_FINAL)
{
++NextOffset;
--SizeOfBlock;
break;
}
Temp = *(PUSHORT)FixupVA & 16;
++NextOffset;
--SizeOfBlock;
Temp += (LONG)(*(PSHORT)NextOffset);
Temp += (ULONG)Diff;
Temp += 0x8000;
*(PUSHORT)FixupVA = (USHORT)(Temp >> 16);
break;
}
case IMAGE_REL_BASED_LOW:
{
Temp = *(PSHORT)FixupVA;
Temp += (ULONG)Diff;
*(PUSHORT)FixupVA = (USHORT)Temp;
break;
}
case IMAGE_REL_BASED_IA64_IMM64:
{
FixupVA = (PUCHAR)((ULONG_PTR)FixupVA & ~(15));
Value64 = (ULONGLONG)0;
EXT_IMM64(Value64,
(PULONG)FixupVA + EMARCH_ENC_I17_IMM7B_INST_WORD_X,
EMARCH_ENC_I17_IMM7B_SIZE_X,
EMARCH_ENC_I17_IMM7B_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM7B_VAL_POS_X);
EXT_IMM64(Value64,
(PULONG)FixupVA + EMARCH_ENC_I17_IMM9D_INST_WORD_X,
EMARCH_ENC_I17_IMM9D_SIZE_X,
EMARCH_ENC_I17_IMM9D_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM9D_VAL_POS_X);
EXT_IMM64(Value64,
(PULONG)FixupVA + EMARCH_ENC_I17_IMM5C_INST_WORD_X,
EMARCH_ENC_I17_IMM5C_SIZE_X,
EMARCH_ENC_I17_IMM5C_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM5C_VAL_POS_X);
EXT_IMM64(Value64,
(PULONG)FixupVA + EMARCH_ENC_I17_IC_INST_WORD_X,
EMARCH_ENC_I17_IC_SIZE_X,
EMARCH_ENC_I17_IC_INST_WORD_POS_X,
EMARCH_ENC_I17_IC_VAL_POS_X);
EXT_IMM64(Value64,
(PULONG)FixupVA + EMARCH_ENC_I17_IMM41a_INST_WORD_X,
EMARCH_ENC_I17_IMM41a_SIZE_X,
EMARCH_ENC_I17_IMM41a_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM41a_VAL_POS_X);
EXT_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41b_INST_WORD_X),
EMARCH_ENC_I17_IMM41b_SIZE_X,
EMARCH_ENC_I17_IMM41b_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM41b_VAL_POS_X);
EXT_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41c_INST_WORD_X),
EMARCH_ENC_I17_IMM41c_SIZE_X,
EMARCH_ENC_I17_IMM41c_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM41c_VAL_POS_X);
EXT_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_SIGN_INST_WORD_X),
EMARCH_ENC_I17_SIGN_SIZE_X,
EMARCH_ENC_I17_SIGN_INST_WORD_POS_X,
EMARCH_ENC_I17_SIGN_VAL_POS_X);
Value64 += Diff;
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM7B_INST_WORD_X),
EMARCH_ENC_I17_IMM7B_SIZE_X,
EMARCH_ENC_I17_IMM7B_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM7B_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM9D_INST_WORD_X),
EMARCH_ENC_I17_IMM9D_SIZE_X,
EMARCH_ENC_I17_IMM9D_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM9D_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM5C_INST_WORD_X),
EMARCH_ENC_I17_IMM5C_SIZE_X,
EMARCH_ENC_I17_IMM5C_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM5C_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IC_INST_WORD_X),
EMARCH_ENC_I17_IC_SIZE_X,
EMARCH_ENC_I17_IC_INST_WORD_POS_X,
EMARCH_ENC_I17_IC_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41a_INST_WORD_X),
EMARCH_ENC_I17_IMM41a_SIZE_X,
EMARCH_ENC_I17_IMM41a_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM41a_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41b_INST_WORD_X),
EMARCH_ENC_I17_IMM41b_SIZE_X,
EMARCH_ENC_I17_IMM41b_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM41b_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41c_INST_WORD_X),
EMARCH_ENC_I17_IMM41c_SIZE_X,
EMARCH_ENC_I17_IMM41c_INST_WORD_POS_X,
EMARCH_ENC_I17_IMM41c_VAL_POS_X);
INS_IMM64(Value64,
((PULONG)FixupVA + EMARCH_ENC_I17_SIGN_INST_WORD_X),
EMARCH_ENC_I17_SIGN_SIZE_X,
EMARCH_ENC_I17_SIGN_INST_WORD_POS_X,
EMARCH_ENC_I17_SIGN_VAL_POS_X);
break;
}
case IMAGE_REL_BASED_DIR64:
{
*(ULONGLONG UNALIGNED *)FixupVA += Diff;
break;
}
case IMAGE_REL_BASED_MIPS_JMPADDR:
{
Temp = (*(PULONG)FixupVA & 0x3ffffff) & 2;
Temp += (ULONG)Diff;
*(PULONG)FixupVA = (*(PULONG)FixupVA & ~0x3ffffff) | ((Temp >> 2) & 0x3ffffff);
break;
}
case IMAGE_REL_BASED_ABSOLUTE:
break;
default:
return (PIMAGE_BASE_RELOCATION)NULL;
}
++NextOffset;
}
return (PIMAGE_BASE_RELOCATION)NextOffset;
}
}