reactos/tools/pefixup.c

   1 /*
   2  * PE Fixup Utility
   3  * Copyright (C) 2005 Filip Navara
   4  *
   5  * The purpose of this utility is fix PE binaries generated by binutils and
   6  * to manipulate flags that can't be set by binutils.
   7  *
   8  * Currently two features are implemented:
   9  *
  10  * - Setting flags on PE sections for use by drivers. The sections
  11  *   .text, .data, .idata, .bss are marked as non-pageable and
  12  *   non-discarable, section PAGE is marked as pageable and section
  13  *   INIT is marked as discaradable.
  14  *
  15  * - Sorting of export name table in executables. DLLTOOL has bug
  16  *   in sorting algorithm when the --kill-at flag is used. The exports
  17  *   are sorted in the decorated form and so the fastcall symbols are
  18  *   incorrectly put at the beginning of export table. This option
  19  *   allow to correct sort the table, so binary search can be used
  20  *   to process them.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <fcntl.h>
  27
  28 #ifndef O_BINARY
  29 #define O_BINARY 0
  30 #endif
  31
  32 /* The following definitions are ripped from MinGW W32API headers. We don't
  33    use these headers directly in order to allow compilation on Linux hosts. */
  34
  35 typedef unsigned char BYTE;
  36 typedef unsigned short WORD;
  37 typedef unsigned int DWORD;
  38 typedef int LONG;
  39
  40 #define IMAGE_NUMBEROF_DIRECTORY_ENTRIES 16
  41 #define IMAGE_SIZEOF_SHORT_NAME 8
  42 #define IMAGE_DOS_SIGNATURE 0x5A4D
  43 #define IMAGE_NT_SIGNATURE 0x00004550
  44 #define IMAGE_SCN_MEM_DISCARDABLE 0x2000000
  45 #define IMAGE_SCN_MEM_NOT_PAGED 0x8000000
  46 #define FIELD_OFFSET(t,f) ((LONG)&(((t*)0)->f))
  47 #define IMAGE_FIRST_SECTION(h) ((PIMAGE_SECTION_HEADER) ((unsigned long)h+FIELD_OFFSET(IMAGE_NT_HEADERS,OptionalHeader)+((PIMAGE_NT_HEADERS)(h))->FileHeader.SizeOfOptionalHeader))
  48 #define IMAGE_DIRECTORY_ENTRY_EXPORT 0
  49
  50 #pragma pack(2)
  51 typedef struct _IMAGE_DOS_HEADER {
  52         WORD e_magic;
  53         WORD e_cblp;
  54         WORD e_cp;
  55         WORD e_crlc;
  56         WORD e_cparhdr;
  57         WORD e_minalloc;
  58         WORD e_maxalloc;
  59         WORD e_ss;
  60         WORD e_sp;
  61         WORD e_csum;
  62         WORD e_ip;
  63         WORD e_cs;
  64         WORD e_lfarlc;
  65         WORD e_ovno;
  66         WORD e_res[4];
  67         WORD e_oemid;
  68         WORD e_oeminfo;
  69         WORD e_res2[10];
  70         LONG e_lfanew;
  71 } IMAGE_DOS_HEADER,*PIMAGE_DOS_HEADER;
  72 #pragma pack(4)
  73 #pragma pack(4)
  74 typedef struct _IMAGE_EXPORT_DIRECTORY {
  75         DWORD Characteristics;
  76         DWORD TimeDateStamp;
  77         WORD MajorVersion;
  78         WORD MinorVersion;
  79         DWORD Name;
  80         DWORD Base;
  81         DWORD NumberOfFunctions;
  82         DWORD NumberOfNames;
  83         DWORD AddressOfFunctions;
  84         DWORD AddressOfNames;
  85         DWORD AddressOfNameOrdinals;
  86 } IMAGE_EXPORT_DIRECTORY,*PIMAGE_EXPORT_DIRECTORY;
  87 typedef struct _IMAGE_FILE_HEADER {
  88         WORD Machine;
  89         WORD NumberOfSections;
  90         DWORD TimeDateStamp;
  91         DWORD PointerToSymbolTable;
  92         DWORD NumberOfSymbols;
  93         WORD SizeOfOptionalHeader;
  94         WORD Characteristics;
  95 } IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;
  96 typedef struct _IMAGE_DATA_DIRECTORY {
  97         DWORD VirtualAddress;
  98         DWORD Size;
  99 } IMAGE_DATA_DIRECTORY,*PIMAGE_DATA_DIRECTORY;
 100 typedef struct _IMAGE_OPTIONAL_HEADER {
 101         WORD Magic;
 102         BYTE MajorLinkerVersion;
 103         BYTE MinorLinkerVersion;
 104         DWORD SizeOfCode;
 105         DWORD SizeOfInitializedData;
 106         DWORD SizeOfUninitializedData;
 107         DWORD AddressOfEntryPoint;
 108         DWORD BaseOfCode;
 109         DWORD BaseOfData;
 110         DWORD ImageBase;
 111         DWORD SectionAlignment;
 112         DWORD FileAlignment;
 113         WORD MajorOperatingSystemVersion;
 114         WORD MinorOperatingSystemVersion;
 115         WORD MajorImageVersion;
 116         WORD MinorImageVersion;
 117         WORD MajorSubsystemVersion;
 118         WORD MinorSubsystemVersion;
 119         DWORD Reserved1;
 120         DWORD SizeOfImage;
 121         DWORD SizeOfHeaders;
 122         DWORD CheckSum;
 123         WORD Subsystem;
 124         WORD DllCharacteristics;
 125         DWORD SizeOfStackReserve;
 126         DWORD SizeOfStackCommit;
 127         DWORD SizeOfHeapReserve;
 128         DWORD SizeOfHeapCommit;
 129         DWORD LoaderFlags;
 130         DWORD NumberOfRvaAndSizes;
 131         IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];
 132 } IMAGE_OPTIONAL_HEADER,*PIMAGE_OPTIONAL_HEADER;
 133 typedef struct _IMAGE_NT_HEADERS {
 134         DWORD Signature;
 135         IMAGE_FILE_HEADER FileHeader;
 136         IMAGE_OPTIONAL_HEADER OptionalHeader;
 137 } IMAGE_NT_HEADERS,*PIMAGE_NT_HEADERS;
 138 typedef struct _IMAGE_SECTION_HEADER {
 139         BYTE Name[IMAGE_SIZEOF_SHORT_NAME];
 140         union {
 141                 DWORD PhysicalAddress;
 142                 DWORD VirtualSize;
 143         } Misc;
 144         DWORD VirtualAddress;
 145         DWORD SizeOfRawData;
 146         DWORD PointerToRawData;
 147         DWORD PointerToRelocations;
 148         DWORD PointerToLinenumbers;
 149         WORD NumberOfRelocations;
 150         WORD NumberOfLinenumbers;
 151         DWORD Characteristics;
 152 } IMAGE_SECTION_HEADER,*PIMAGE_SECTION_HEADER;
 153 #pragma pack(4)
 154
 155 /* End of ripped definitions */
 156
 157 typedef struct _export_t {
 158    DWORD name;
 159    WORD ordinal;
 160 } export_t;
 161
 162 unsigned char *buffer;
 163 PIMAGE_DOS_HEADER dos_header;
 164 PIMAGE_NT_HEADERS nt_header;
 165
 166 void *rva_to_ptr(DWORD rva)
 167 {
 168    PIMAGE_SECTION_HEADER section_header;
 169    unsigned int i;
 170
 171    for (i = 0, section_header = IMAGE_FIRST_SECTION(nt_header);
 172         i < nt_header->OptionalHeader.NumberOfRvaAndSizes;
 173         i++, section_header++)
 174    {
 175       if (rva >= section_header->VirtualAddress &&
 176           rva < section_header->VirtualAddress +
 177                 section_header->Misc.VirtualSize)
 178       {
 179          return buffer + rva - section_header->VirtualAddress +
 180                 section_header->PointerToRawData;
 181       }
 182    }
 183
 184    return NULL;
 185 }
 186
 187 int export_compare_func(const void *a, const void *b)
 188 {
 189    const export_t *ap = a;
 190    const export_t *bp = b;
 191    char *an = rva_to_ptr(ap->name);
 192    char *bn = rva_to_ptr(bp->name);
 193    return strcmp(an, bn);
 194 }
 195
 196 int main(int argc, char **argv)
 197 {
 198    int fd_in, fd_out;
 199    long len;
 200    PIMAGE_SECTION_HEADER section_header;
 201    PIMAGE_DATA_DIRECTORY data_dir;
 202    unsigned int i;
 203    unsigned long checksum;
 204    int fixup_exports = 0;
 205    int fixup_sections = 0;
 206
 207    /*
 208     * Process parameters.
 209     */
 210
 211    if (argc < 2)
 212    {
 213       printf("Usage: %s <filename> <options>\n"
 214              "Options:\n"
 215              " -sections Sets section flags for PE image.\n"
 216              " -exports Sort the names in export table.\n",
 217              argv[0]);
 218       return 1;
 219    }
 220
 221    for (i = 2; i < argc; i++)
 222    {
 223       if (!strcmp(argv[i], "-sections"))
 224          fixup_sections = 1;
 225       else if (!strcmp(argv[i], "-exports"))
 226          fixup_exports = 1;
 227       else
 228          { printf("Invalid option: %s\n", argv[i]); return 1; }
 229    }
 230
 231    if (fixup_sections == 0 && fixup_exports == 0)
 232    {
 233       printf("Nothing to do.\n");
 234       return 0;
 235    }
 236
 237    /*
 238     * Read the whole file to memory.
 239     */
 240
 241    fd_in = open(argv[1], O_RDONLY | O_BINARY);
 242    if (fd_in == 0)
 243    {
 244       printf("Can't open input file.\n");
 245       return 1;
 246    }
 247
 248    len = lseek(fd_in, 0, SEEK_END);
 249    if (len < sizeof(IMAGE_DOS_HEADER))
 250    {
 251       close(fd_in);
 252       printf("'%s' isn't a PE image.\n", argv[1]);
 253       return 1;
 254    }
 255
 256    buffer = malloc((len + 1) & ~1);
 257    if (buffer == NULL)
 258    {
 259       close(fd_in);
 260       printf("Not enough memory available.\n");
 261       return 1;
 262    }
 263
 264    /* Read the whole input file into a buffer */
 265    lseek(fd_in, 0, SEEK_SET);
 266    read(fd_in, buffer, len);
 267    if (len & 1)
 268       buffer[len] = 0;
 269
 270    close(fd_in);
 271
 272    /*
 273     * Check the headers and save pointers to them.
 274     */
 275
 276    dos_header = (PIMAGE_DOS_HEADER)buffer;
 277    nt_header = (PIMAGE_NT_HEADERS)(buffer + dos_header->e_lfanew);
 278
 279    if (dos_header->e_magic != IMAGE_DOS_SIGNATURE ||
 280        nt_header->Signature != IMAGE_NT_SIGNATURE)
 281    {
 282       printf("'%s' isn't a PE image.\n", argv[1]);
 283       free(buffer);
 284       return 1;
 285    }
 286
 287    if (fixup_exports)
 288    {
 289       /* Sort export directory */
 290       data_dir = &nt_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
 291       if (data_dir->Size != 0)
 292       {
 293          PIMAGE_EXPORT_DIRECTORY export_directory;
 294          DWORD *name_ptr;
 295          WORD *ordinal_ptr;
 296          export_t *exports;
 297
 298          export_directory = (PIMAGE_EXPORT_DIRECTORY)rva_to_ptr(data_dir->VirtualAddress);
 299          if (export_directory != NULL)
 300          {
 301             exports = malloc(sizeof(export_t) * export_directory->NumberOfNames);
 302             if (exports == NULL)
 303             {
 304                printf("Not enough memory.\n");
 305                free(buffer);
 306                return 1;
 307             }
 308
 309             name_ptr = (DWORD *)rva_to_ptr(export_directory->AddressOfNames);
 310             ordinal_ptr = (WORD *)rva_to_ptr(export_directory->AddressOfNameOrdinals);
 311
 312             for (i = 0; i < export_directory->NumberOfNames; i++)
 313             {
 314                exports[i].name = name_ptr[i];
 315                exports[i].ordinal = ordinal_ptr[i];
 316             }
 317
 318             qsort(exports, export_directory->NumberOfNames, sizeof(export_t),
 319                   export_compare_func);
 320
 321             for (i = 0; i < export_directory->NumberOfNames; i++)
 322             {
 323                name_ptr[i] = exports[i].name;
 324                ordinal_ptr[i] = exports[i].ordinal;
 325             }
 326
 327             free(exports);
 328          }
 329       }
 330    }
 331
 332    if (fixup_sections)
 333    {
 334       /* Update section flags */
 335       for (i = 0, section_header = IMAGE_FIRST_SECTION(nt_header);
 336            i < nt_header->OptionalHeader.NumberOfRvaAndSizes;
 337            i++, section_header++)
 338       {
 339          if (!strcmp((char*)section_header->Name, ".text") ||
 340              !strcmp((char*)section_header->Name, ".data") ||
 341              !strcmp((char*)section_header->Name, ".idata") ||
 342              !strcmp((char*)section_header->Name, ".bss"))
 343          {
 344             section_header->Characteristics |= IMAGE_SCN_MEM_NOT_PAGED;
 345             section_header->Characteristics &= ~IMAGE_SCN_MEM_DISCARDABLE;
 346          }
 347          else if (!strcmp((char*)section_header->Name, "INIT"))
 348          {
 349             section_header->Characteristics |= IMAGE_SCN_MEM_DISCARDABLE;
 350          }
 351          else if (!strcmp((char*)section_header->Name, "PAGE"))
 352          {
 353             section_header->Characteristics |= IMAGE_SCN_MEM_NOT_PAGED;
 354          }
 355       }
 356    }
 357
 358    /* Recalculate checksum */
 359    nt_header->OptionalHeader.CheckSum = 0;
 360    checksum = 0;
 361    for (i = 0; i < len; i += 2)
 362    {
 363       checksum += *(unsigned short *)(buffer + i);
 364       checksum = (checksum + (checksum >> 16)) & 0xffff;
 365    }
 366    checksum += len;
 367    nt_header->OptionalHeader.CheckSum = checksum;
 368
 369    /* Write the output file */
 370    fd_out = open(argv[1], O_WRONLY | O_BINARY);
 371    write(fd_out, buffer, len);
 372    close(fd_out);
 373
 374    return 0;
 375 }