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29A Issue 02 03 04
/*
. .: .:.. :.. .. .:.::. :. ..:
<<-==ÜÛÛÛÛÛÜ=ÜÛÛÛÛÛÜ=ÜÛÛÛÛÛÜ===<
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>===ÛÛÛÛÛÛÛ=ÛÛÛÛÛÛß=ÛÛÛ ÛÛÛ=->>
.: .:.. ..:. .: ..:.::. ::.. :.:.
[PEWRSEC]
PE Write Section, by Jacky Qwerty/29A
Here's a new utility from 29A. This program simply sets the write bit to a
section in a PE file. This is needed when you need write access to the code
section in a first generation sample, for instance. There is one utility
from the SDK (EDITBIN) which does exactly the same thing with PE filez, but
it needs some huge DLLz from VC to work. On the other hand, PEWRSEC can be
compiled as a stupid COM file. Hope this will be handy enough for you ;)
*/
/*- -[PEWRSEC.C]- - - - - - - - - - - - - - - - - - - - - - - - - - - ->8 */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "mz.h"
#include "pe.h"
#define SizeBuffMZ sizeof(IMAGE_DOS_HEADER)
#define SizeBuffPE (4 + IMAGE_SIZEOF_FILE_HEADER + IMAGE_SIZEOF_STD_OPTIONAL_HEADER)
#define SizeBuffSH IMAGE_SIZEOF_SECTION_HEADER
#define SizeBuffMax max(SizeBuffMZ, max(SizeBuffPE, SizeBuffSH))
INT Strncmpz(BYTE *S1, BYTE *S2, INT Count) {
while (Count--) {
if (*S1 < *S2) return -1; // This fucntion doesnt seem to be implemented
if (*S1 > *S2++) return 1; // in the standard C string library, It combines
if (!*S1++) break; } // the funtionality of "strcmp" and "strncmp".
return 0;
}
INT main(INT argc, CHAR *argv[]) {
FILE *File;
INT RetValue = 1;
PCHAR SecName = NULL, FileName = NULL;
WORD Sections;
PIMAGE_DOS_HEADER pMZ;
PIMAGE_NT_HEADERS pPE;
PIMAGE_SECTION_HEADER pSH;
CHAR Buffer[SizeBuffMax];
printf("PEWRSEC - Sets the WRITE bit to a PE section - (c) 1997 jqwerty/29A\n\n");
if (argc != 2 && argc != 3) {
printf(" Syntax: PEWRSEC [/SEC:<SectionName>] <FileName> (default: code section)\n");
Ret: return RetValue; }
while (--argc) {
if (*argv[argc] != '/') {
if ((FileName = argv[argc]) == NULL) { printf("No filename specified\n"); goto Ret; } }
else if (!strncmpi(argv[argc] + 1, "SEC:", 4)) SecName = argv[argc] + 5;
else { printf("Unknown option '%s'\n", argv[argc]); goto Ret; } }
if ((File = fopen(FileName, "rb+")) == 0) {
printf("Can't open '%s'\n", FileName); goto Ret; }
if (!fread(pMZ = (PIMAGE_DOS_HEADER)Buffer, SizeBuffMZ, 1, File)) {
ReadErr:
if (!feof(File)) { printf("Error reading file\n"); CloseFile: fclose(File); goto Ret; }
else { InvalidPE: printf("Not a valid PE file\n"); goto CloseFile; } }
if (pMZ->e_magic != IMAGE_DOS_SIGNATURE) goto InvalidPE;
if (fseek(File, pMZ->e_lfanew, SEEK_SET)) {
SeekErr:
if (errno != EBADF) { printf("Error in file seek\n"); goto CloseFile; }
else goto InvalidPE; }
if (!fread(pPE = (PIMAGE_NT_HEADERS)Buffer, SizeBuffPE, 1, File)) goto ReadErr;
if (pPE->Signature != IMAGE_NT_SIGNATURE || !(Sections = pPE->FileHeader.NumberOfSections)) goto InvalidPE;
if (fseek(File, FIELD_OFFSET(IMAGE_NT_HEADERS, OptionalHeader) + pPE->FileHeader.SizeOfOptionalHeader - SizeBuffPE, SEEK_CUR)) goto SeekErr;
do {
if (!fread(pSH = (PIMAGE_SECTION_HEADER)Buffer, SizeBuffSH, 1, File)) goto ReadErr;
if (SecName) { if (!Strncmpz(SecName, pSH->Name, 8)) break; }
else if (pSH->VirtualAddress <= pPE->OptionalHeader.AddressOfEntryPoint && pPE->OptionalHeader.AddressOfEntryPoint < pSH->VirtualAddress + pSH->Misc.VirtualSize) break;
} while (--Sections);
if (!Sections) { printf("Section not found\n"); goto CloseFile; }
if (!(pSH->Characteristics & IMAGE_SCN_MEM_WRITE)) {
pSH->Characteristics |= IMAGE_SCN_MEM_WRITE;
if (fseek(File, - SizeBuffSH, SEEK_CUR)) goto SeekErr;
if (!fwrite(pSH, SizeBuffSH, 1, File) || fflush(File)) {
printf("Error writing file\n"); goto CloseFile; } }
printf("Ok\n"); RetValue = 0; goto CloseFile;
}
/*- -[MZ.H] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ->8 */
//
// DOS EXE MZ format
//
#define IMAGE_DOS_SIGNATURE 0x5A4D // MZ
typedef struct _IMAGE_DOS_HEADER { // DOS EXE header
WORD e_magic; // Magic number
WORD e_cblp; // Bytes on last page of file
WORD e_cp; // Pages in file
WORD e_crlc; // Relocations
WORD e_cparhdr; // Size of header in paragraphs
WORD e_minalloc; // Minimum extra paragraphs needed
WORD e_maxalloc; // Maximum extra paragraphs needed
WORD e_ss; // Initial (relative) SS value
WORD e_sp; // Initial SP value
WORD e_csum; // Checksum
WORD e_ip; // Initial IP value
WORD e_cs; // Initial (relative) CS value
WORD e_lfarlc; // File address of relocation table
WORD e_ovno; // Overlay number
WORD e_res[4]; // Reserved words
WORD e_oemid; // OEM identifier (for e_oeminfo)
WORD e_oeminfo; // OEM information; e_oemid specific
WORD e_res2[10]; // Reserved words
LONG e_lfanew; // File address of new exe header
} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER;
/*- -[PE.H] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ->8 */
//
// Portable Executable format
//
#define IMAGE_NT_SIGNATURE 0x00004550 // PE00
// File header format.
typedef struct _IMAGE_FILE_HEADER {
WORD Machine;
WORD NumberOfSections;
DWORD TimeDateStamp;
DWORD PointerToSymbolTable;
DWORD NumberOfSymbols;
WORD SizeOfOptionalHeader;
WORD Characteristics;
} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;
#define IMAGE_SIZEOF_FILE_HEADER 20
#define IMAGE_FILE_RELOCS_STRIPPED 0x0001 // Relocation info stripped from file.
#define IMAGE_FILE_EXECUTABLE_IMAGE 0x0002 // File is executable (i.e. no unresolved externel references).
#define IMAGE_FILE_LINE_NUMS_STRIPPED 0x0004 // Line nunbers stripped from file.
#define IMAGE_FILE_LOCAL_SYMS_STRIPPED 0x0008 // Local symbols stripped from file.
#define IMAGE_FILE_MINIMAL_OBJECT 0x0010 // Reserved.
#define IMAGE_FILE_UPDATE_OBJECT 0x0020 // Reserved.
#define IMAGE_FILE_16BIT_MACHINE 0x0040 // 16 bit word machine.
#define IMAGE_FILE_BYTES_REVERSED_LO 0x0080 // Bytes of machine word are reversed.
#define IMAGE_FILE_32BIT_MACHINE 0x0100 // 32 bit word machine.
#define IMAGE_FILE_DEBUG_STRIPPED 0x0200 // Debugging info stripped from file in .DBG file
#define IMAGE_FILE_PATCH 0x0400 // Reserved.
#define IMAGE_FILE_SYSTEM 0x1000 // System File.
#define IMAGE_FILE_DLL 0x2000 // File is a DLL.
#define IMAGE_FILE_BYTES_REVERSED_HI 0x8000 // Bytes of machine word are reversed.
#define IMAGE_FILE_MACHINE_UNKNOWN 0
#define IMAGE_FILE_MACHINE_I386 0x14c // Intel 386.
#define IMAGE_FILE_MACHINE_R3000 0x162 // MIPS little-endian, 0540 big-endian
#define IMAGE_FILE_MACHINE_R4000 0x166 // MIPS little-endian
#define IMAGE_FILE_MACHINE_ALPHA 0x184 // Alpha_AXP
#define IMAGE_FILE_MACHINE_POWERPC 0x1F0 // IBM PowerPC Little-Endian
// Directory format.
typedef struct _IMAGE_DATA_DIRECTORY {
DWORD VirtualAddress;
DWORD Size;
} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY;
#define IMAGE_NUMBEROF_DIRECTORY_ENTRIES 16
// Optional header format.
typedef struct _IMAGE_OPTIONAL_HEADER {
// Standard fields.
WORD Magic;
BYTE MajorLinkerVersion;
BYTE MinorLinkerVersion;
DWORD SizeOfCode;
DWORD SizeOfInitializedData;
DWORD SizeOfUninitializedData;
DWORD AddressOfEntryPoint;
DWORD BaseOfCode;
DWORD BaseOfData;
// NT additional fields.
DWORD ImageBase;
DWORD SectionAlignment;
DWORD FileAlignment;
WORD MajorOperatingSystemVersion;
WORD MinorOperatingSystemVersion;
WORD MajorImageVersion;
WORD MinorImageVersion;
WORD MajorSubsystemVersion;
WORD MinorSubsystemVersion;
DWORD Reserved1;
DWORD SizeOfImage;
DWORD SizeOfHeaders;
DWORD CheckSum;
WORD Subsystem;
WORD DllCharacteristics;
DWORD SizeOfStackReserve;
DWORD SizeOfStackCommit;
DWORD SizeOfHeapReserve;
DWORD SizeOfHeapCommit;
DWORD LoaderFlags;
DWORD NumberOfRvaAndSizes;
IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];
} IMAGE_OPTIONAL_HEADER, *PIMAGE_OPTIONAL_HEADER;
#define IMAGE_SIZEOF_STD_OPTIONAL_HEADER 28
#define IMAGE_SIZEOF_NT_OPTIONAL_HEADER 224
#define IMAGE_NT_OPTIONAL_HDR_MAGIC 0x10b
typedef struct _IMAGE_NT_HEADERS {
DWORD Signature;
IMAGE_FILE_HEADER FileHeader;
IMAGE_OPTIONAL_HEADER OptionalHeader;
} IMAGE_NT_HEADERS, *PIMAGE_NT_HEADERS;
// Calculate the byte offset of a field in a structure of type type.
#define FIELD_OFFSET(type, field) ((LONG)&(((type *)0)->field))
// Calculate the first section header
#define IMAGE_FIRST_SECTION( ntheader ) ((PIMAGE_SECTION_HEADER) \
((DWORD)ntheader + \
FIELD_OFFSET( IMAGE_NT_HEADERS, OptionalHeader ) + \
((PIMAGE_NT_HEADERS)(ntheader))->FileHeader.SizeOfOptionalHeader \
))
// Subsystem Values
#define IMAGE_SUBSYSTEM_UNKNOWN 0 // Unknown subsystem.
#define IMAGE_SUBSYSTEM_NATIVE 1 // Image doesn't require a subsystem.
#define IMAGE_SUBSYSTEM_WINDOWS_GUI 2 // Image runs in the Windows GUI subsystem.
#define IMAGE_SUBSYSTEM_WINDOWS_CUI 3 // Image runs in the Windows character subsystem.
#define IMAGE_SUBSYSTEM_OS2_CUI 5 // image runs in the OS/2 character subsystem.
#define IMAGE_SUBSYSTEM_POSIX_CUI 7 // image run in the Posix character subsystem.
// Dll Characteristics
#define IMAGE_LIBRARY_PROCESS_INIT 1 // Dll has a process initialization routine.
#define IMAGE_LIBRARY_PROCESS_TERM 2 // Dll has a thread termination routine.
#define IMAGE_LIBRARY_THREAD_INIT 4 // Dll has a thread initialization routine.
#define IMAGE_LIBRARY_THREAD_TERM 8 // Dll has a thread termination routine.
// Loader Flags
#define IMAGE_LOADER_FLAGS_BREAK_ON_LOAD 0x00000001
#define IMAGE_LOADER_FLAGS_DEBUG_ON_LOAD 0x00000002
// Directory Entries
#define IMAGE_DIRECTORY_ENTRY_EXPORT 0 // Export Directory
#define IMAGE_DIRECTORY_ENTRY_IMPORT 1 // Import Directory
#define IMAGE_DIRECTORY_ENTRY_RESOURCE 2 // Resource Directory
#define IMAGE_DIRECTORY_ENTRY_EXCEPTION 3 // Exception Directory
#define IMAGE_DIRECTORY_ENTRY_SECURITY 4 // Security Directory
#define IMAGE_DIRECTORY_ENTRY_BASERELOC 5 // Base Relocation Table
#define IMAGE_DIRECTORY_ENTRY_DEBUG 6 // Debug Directory
#define IMAGE_DIRECTORY_ENTRY_COPYRIGHT 7 // Description String
#define IMAGE_DIRECTORY_ENTRY_GLOBALPTR 8 // Machine Value (MIPS GP)
#define IMAGE_DIRECTORY_ENTRY_TLS 9 // TLS Directory
#define IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG 10 // Load Configuration Directory
// Section header format.
#define IMAGE_SIZEOF_SHORT_NAME 8
typedef struct _IMAGE_SECTION_HEADER {
BYTE Name[IMAGE_SIZEOF_SHORT_NAME];
union {
DWORD PhysicalAddress;
DWORD VirtualSize;
} Misc;
DWORD VirtualAddress;
DWORD SizeOfRawData;
DWORD PointerToRawData;
DWORD PointerToRelocations;
DWORD PointerToLinenumbers;
WORD NumberOfRelocations;
WORD NumberOfLinenumbers;
DWORD Characteristics;
} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER;
#define IMAGE_SIZEOF_SECTION_HEADER 40
#define IMAGE_SCN_TYPE_REGULAR 0x00000000 //
#define IMAGE_SCN_TYPE_DUMMY 0x00000001 // Reserved.
#define IMAGE_SCN_TYPE_NO_LOAD 0x00000002 // Reserved.
#define IMAGE_SCN_TYPE_GROUPED 0x00000004 // Used for 16-bit offset code.
#define IMAGE_SCN_TYPE_NO_PAD 0x00000008 // Reserved.
#define IMAGE_SCN_TYPE_COPY 0x00000010 // Reserved.
#define IMAGE_SCN_CNT_CODE 0x00000020 // Section contains code.
#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 // Section contains initialized data.
#define IMAGE_SCN_CNT_UNINITIALIZED_DATA 0x00000080 // Section contains uninitialized data.
#define IMAGE_SCN_LNK_OTHER 0x00000100 // Reserved.
#define IMAGE_SCN_LNK_INFO 0x00000200 // Section contains comments or some other type of information.
#define IMAGE_SCN_LNK_OVERLAY 0x00000400 // Section contains an overlay.
#define IMAGE_SCN_LNK_REMOVE 0x00000800 // Section contents will not become part of image.
#define IMAGE_SCN_LNK_COMDAT 0x00001000 // Section contents comdat.
#define IMAGE_SCN_ALIGN_1BYTES 0x00100000 //
#define IMAGE_SCN_ALIGN_2BYTES 0x00200000 //
#define IMAGE_SCN_ALIGN_4BYTES 0x00300000 //
#define IMAGE_SCN_ALIGN_8BYTES 0x00400000 //
#define IMAGE_SCN_ALIGN_16BYTES 0x00500000 // Default alignment if no others are specified.
#define IMAGE_SCN_ALIGN_32BYTES 0x00600000 //
#define IMAGE_SCN_ALIGN_64BYTES 0x00700000 //
#define IMAGE_SCN_MEM_DISCARDABLE 0x02000000 // Section can be discarded.
#define IMAGE_SCN_MEM_NOT_CACHED 0x04000000 // Section is not cachable.
#define IMAGE_SCN_MEM_NOT_PAGED 0x08000000 // Section is not pageable.
#define IMAGE_SCN_MEM_SHARED 0x10000000 // Section is shareable.
#define IMAGE_SCN_MEM_EXECUTE 0x20000000 // Section is executable.
#define IMAGE_SCN_MEM_READ 0x40000000 // Section is readable.
#define IMAGE_SCN_MEM_WRITE 0x80000000 // Section is writeable.
/*- -[TYPES.H]- - - - - - - - - - - - - - - - - - - - - - - - - - - - ->8 */
#ifndef CHAR
typedef signed char CHAR;
#endif
#ifndef SHORT
typedef signed short SHORT;
#endif
#ifndef LONG
typedef signed long LONG;
#endif
#ifndef INT
typedef signed INT;
#endif
#ifndef BYTE
typedef unsigned char BYTE;
#endif
#ifndef WORD
typedef unsigned short WORD;
#endif
#ifndef DWORD
typedef unsigned long DWORD;
#endif
#ifndef UINT
typedef unsigned UINT;
#endif
#ifndef PCHAR
typedef CHAR *PCHAR;
#endif
#ifndef PSHORT
typedef SHORT *PSHORT;
#endif
#ifndef PLONG
typedef LONG *PLONG;
#endif
#ifndef PINT
typedef INT *PINT;
#endif
#ifndef PBYTE
typedef BYTE *PBYTE;
#endif
#ifndef PWORD
typedef WORD *PWORD;
#endif
#ifndef PDWORD
typedef DWORD *PDWORD;
#endif
#ifndef PUINT
typedef UINT *PUINT;
#endif
