#undef IS_WINDOWS #if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__) #define IS_WINDOWS 1 #endif #include #include #include #include #include #include #include #include #include "limine-hdd.h" static bool quiet = false; static int set_pos(FILE *stream, uint64_t pos) { if (sizeof(long) >= 8) { return fseek(stream, (long)pos, SEEK_SET); } long jump_size = (LONG_MAX / 2) + 1; long last_jump = pos % jump_size; uint64_t jumps = pos / jump_size; rewind(stream); for (uint64_t i = 0; i < jumps; i++) { if (fseek(stream, jump_size, SEEK_CUR) != 0) { return -1; } } if (fseek(stream, last_jump, SEEK_CUR) != 0) { return -1; } return 0; } #define DIV_ROUNDUP(a, b) (((a) + ((b) - 1)) / (b)) struct gpt_table_header { // the head char signature[8]; uint32_t revision; uint32_t header_size; uint32_t crc32; uint32_t _reserved0; // the partitioning info uint64_t my_lba; uint64_t alternate_lba; uint64_t first_usable_lba; uint64_t last_usable_lba; // the guid uint64_t disk_guid[2]; // entries related uint64_t partition_entry_lba; uint32_t number_of_partition_entries; uint32_t size_of_partition_entry; uint32_t partition_entry_array_crc32; }; struct gpt_entry { uint64_t partition_type_guid[2]; uint64_t unique_partition_guid[2]; uint64_t starting_lba; uint64_t ending_lba; uint64_t attributes; uint16_t partition_name[36]; }; // This table from https://web.mit.edu/freebsd/head/sys/libkern/crc32.c static const uint32_t crc32_table[] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; static uint32_t crc32(void *_stream, size_t len) { uint8_t *stream = _stream; uint32_t ret = 0xffffffff; for (size_t i = 0; i < len; i++) { ret = (ret >> 8) ^ crc32_table[(ret ^ stream[i]) & 0xff]; } ret ^= 0xffffffff; return ret; } static bool bigendian = false; static uint16_t endswap16(uint16_t value) { uint16_t ret = 0; ret |= (value >> 8) & 0x00ff; ret |= (value << 8) & 0xff00; return ret; } static uint32_t endswap32(uint32_t value) { uint32_t ret = 0; ret |= (value >> 24) & 0x000000ff; ret |= (value >> 8) & 0x0000ff00; ret |= (value << 8) & 0x00ff0000; ret |= (value << 24) & 0xff000000; return ret; } static uint64_t endswap64(uint64_t value) { uint64_t ret = 0; ret |= (value >> 56) & 0x00000000000000ff; ret |= (value >> 40) & 0x000000000000ff00; ret |= (value >> 24) & 0x0000000000ff0000; ret |= (value >> 8) & 0x00000000ff000000; ret |= (value << 8) & 0x000000ff00000000; ret |= (value << 24) & 0x0000ff0000000000; ret |= (value << 40) & 0x00ff000000000000; ret |= (value << 56) & 0xff00000000000000; return ret; } #define ENDSWAP(VALUE) (bigendian ? ( \ sizeof(VALUE) == 1 ? (VALUE) : \ sizeof(VALUE) == 2 ? endswap16(VALUE) : \ sizeof(VALUE) == 4 ? endswap32(VALUE) : \ sizeof(VALUE) == 8 ? endswap64(VALUE) : (abort(), 1) \ ) : (VALUE)) static enum { CACHE_CLEAN, CACHE_DIRTY } cache_state; static uint64_t cached_block; static uint8_t *cache = NULL; static FILE *device = NULL; static size_t block_size; static bool device_init(void) { size_t guesses[] = { 512, 2048, 4096 }; for (size_t i = 0; i < sizeof(guesses) / sizeof(size_t); i++) { void *tmp = realloc(cache, guesses[i]); if (tmp == NULL) { perror("ERROR"); return false; } cache = tmp; rewind(device); size_t ret = fread(cache, guesses[i], 1, device); if (ret != 1) { continue; } block_size = guesses[i]; if (!quiet) { fprintf(stderr, "Physical block size of %zu bytes.\n", block_size); } cache_state = CACHE_CLEAN; cached_block = 0; return true; } fprintf(stderr, "ERROR: Couldn't determine block size of device.\n"); return false; } static bool device_flush_cache(void) { if (cache_state == CACHE_CLEAN) return true; if (set_pos(device, cached_block * block_size) != 0) { perror("ERROR"); return false; } size_t ret = fwrite(cache, block_size, 1, device); if (ret != 1) { perror("ERROR"); return false; } cache_state = CACHE_CLEAN; return true; } static bool device_cache_block(uint64_t block) { if (cached_block == block) return true; if (cache_state == CACHE_DIRTY) { if (!device_flush_cache()) return false; } if (set_pos(device, block * block_size) != 0) { perror("ERROR"); return false; } size_t ret = fread(cache, block_size, 1, device); if (ret != 1) { perror("ERROR"); return false; } cached_block = block; return true; } struct undeploy_data { void *data; uint64_t loc; uint64_t count; }; #define UNDEPLOY_DATA_MAX 256 static bool undeploying = false; static struct undeploy_data undeploy_data[UNDEPLOY_DATA_MAX]; static struct undeploy_data undeploy_data_rev[UNDEPLOY_DATA_MAX]; static uint64_t undeploy_data_i = 0; static const char *undeploy_file = NULL; static void reverse_undeploy_data(void) { for (size_t i = 0, j = undeploy_data_i - 1; i < undeploy_data_i; i++, j--) { undeploy_data_rev[j] = undeploy_data[i]; } memcpy(undeploy_data, undeploy_data_rev, undeploy_data_i * sizeof(struct undeploy_data)); } static void free_undeploy_data(void) { for (size_t i = 0; i < undeploy_data_i; i++) { free(undeploy_data[i].data); } } static bool store_undeploy_data(const char *filename) { if (!quiet) { fprintf(stderr, "Storing undeploy data to file: `%s`...\n", filename); } FILE *udfile = fopen(filename, "wb"); if (udfile == NULL) { goto error; } if (fwrite(&undeploy_data_i, sizeof(uint64_t), 1, udfile) != 1) { goto error; } for (size_t i = 0; i < undeploy_data_i; i++) { if (fwrite(&undeploy_data[i].loc, sizeof(uint64_t), 1, udfile) != 1) { goto error; } if (fwrite(&undeploy_data[i].count, sizeof(uint64_t), 1, udfile) != 1) { goto error; } if (fwrite(undeploy_data[i].data, undeploy_data[i].count, 1, udfile) != 1) { goto error; } } fclose(udfile); return true; error: perror("ERROR"); if (udfile != NULL) { fclose(udfile); } return false; } static bool load_undeploy_data(const char *filename) { if (!quiet) { fprintf(stderr, "Loading undeploy data from file: `%s`...\n", filename); } FILE *udfile = fopen(filename, "rb"); if (udfile == NULL) { goto error; } if (fread(&undeploy_data_i, sizeof(uint64_t), 1, udfile) != 1) { goto error; } for (size_t i = 0; i < undeploy_data_i; i++) { if (fread(&undeploy_data[i].loc, sizeof(uint64_t), 1, udfile) != 1) { goto error; } if (fread(&undeploy_data[i].count, sizeof(uint64_t), 1, udfile) != 1) { goto error; } undeploy_data[i].data = malloc(undeploy_data[i].count); if (undeploy_data[i].data == NULL) { goto error; } if (fread(undeploy_data[i].data, undeploy_data[i].count, 1, udfile) != 1) { goto error; } } fclose(udfile); return true; error: perror("ERROR"); if (udfile != NULL) { fclose(udfile); } return false; } static bool _device_read(void *_buffer, uint64_t loc, size_t count) { uint8_t *buffer = _buffer; uint64_t progress = 0; while (progress < count) { uint64_t block = (loc + progress) / block_size; if (!device_cache_block(block)) { fprintf(stderr, "ERROR: Read error.\n"); return false; } uint64_t chunk = count - progress; uint64_t offset = (loc + progress) % block_size; if (chunk > block_size - offset) chunk = block_size - offset; memcpy(buffer + progress, &cache[offset], chunk); progress += chunk; } return true; } static bool _device_write(const void *_buffer, uint64_t loc, size_t count) { if (undeploying) { goto skip_save; } if (undeploy_data_i >= UNDEPLOY_DATA_MAX) { fprintf(stderr, "Internal error: Too many undeploy data entries!\n"); return false; } struct undeploy_data *ud = &undeploy_data[undeploy_data_i]; ud->data = malloc(count); if (ud->data == NULL) { fprintf(stderr, "ERROR: Memory allocation failure.\n"); return false; } if (!_device_read(ud->data, loc, count)) { fprintf(stderr, "ERROR: Device read failure.\n"); return false; } ud->loc = loc; ud->count = count; skip_save:; const uint8_t *buffer = _buffer; uint64_t progress = 0; while (progress < count) { uint64_t block = (loc + progress) / block_size; if (!device_cache_block(block)) { fprintf(stderr, "ERROR: Write error.\n"); return false; } uint64_t chunk = count - progress; uint64_t offset = (loc + progress) % block_size; if (chunk > block_size - offset) chunk = block_size - offset; memcpy(&cache[offset], buffer + progress, chunk); cache_state = CACHE_DIRTY; progress += chunk; } if (!undeploying) { undeploy_data_i++; } return true; } static void undeploy(void) { undeploying = true; cache_state = CACHE_CLEAN; cached_block = (uint64_t)-1; for (size_t i = 0; i < undeploy_data_i; i++) { struct undeploy_data *ud = &undeploy_data[i]; bool retry = false; while (!_device_write(ud->data, ud->loc, ud->count)) { if (retry) { fprintf(stderr, "ERROR: Undeploy data index %zu failed to write. Undeploy may be incomplete!\n", i); break; } if (!quiet) { fprintf(stderr, "Warning: Undeploy data index %zu failed to write, retrying...\n", i); } if (!device_flush_cache()) { fprintf(stderr, "ERROR: Device cache flush failure. Undeploy may be incomplete!\n"); } cache_state = CACHE_CLEAN; cached_block = (uint64_t)-1; retry = true; } } if (!device_flush_cache()) { fprintf(stderr, "ERROR: Device cache flush failure. Undeploy may be incomplete!\n"); } if (!quiet) { fprintf(stderr, "Undeploy data restored successfully. Limine undeployed!\n"); } } #define device_read(BUFFER, LOC, COUNT) \ do { \ if (!_device_read(BUFFER, LOC, COUNT)) \ goto cleanup; \ } while (0) #define device_write(BUFFER, LOC, COUNT) \ do { \ if (!_device_write(BUFFER, LOC, COUNT)) \ goto cleanup; \ } while (0) static void usage(const char *name) { printf("Usage: %s [GPT partition index]\n", name); printf("\n"); printf(" --force-mbr Force MBR detection to work even if the\n"); printf(" safety checks fail (DANGEROUS!)\n"); printf("\n"); printf(" --undeploy Reverse the entire deployment procedure\n"); printf("\n"); printf(" --undeploy-data-file=\n"); printf(" Set the input (for --undeploy) or output file\n"); printf(" name of the file which contains undeploy data\n"); printf("\n"); printf(" --quiet Do not print verbose diagnostic messages\n"); printf("\n"); printf(" --help | -h Display this help message\n"); printf("\n"); } int main(int argc, char *argv[]) { int ok = EXIT_FAILURE; int force_mbr = 0; bool undeploy_mode = false; const uint8_t *bootloader_img = binary_limine_hdd_bin_data; size_t bootloader_file_size = sizeof(binary_limine_hdd_bin_data); uint8_t orig_mbr[70], timestamp[6]; const char *part_ndx = NULL; uint32_t endcheck = 0x12345678; uint8_t endbyte = *((uint8_t *)&endcheck); bigendian = endbyte == 0x12; if (argc < 2) { usage(argv[0]); #ifdef IS_WINDOWS system("pause"); #endif return EXIT_FAILURE; } for (int i = 1; i < argc; i++) { if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) { usage(argv[0]); return EXIT_SUCCESS; } else if (strcmp(argv[i], "--quiet") == 0) { quiet = true; } else if (strcmp(argv[i], "--force-mbr") == 0) { if (force_mbr && !quiet) { fprintf(stderr, "Warning: --force-mbr already set.\n"); } force_mbr = 1; } else if (strcmp(argv[i], "--undeploy") == 0) { if (undeploy_mode && !quiet) { fprintf(stderr, "Warning: --undeploy already set.\n"); } undeploy_mode = true; } else if (memcmp(argv[i], "--undeploy-data-file=", 21) == 0) { if (undeploy_file != NULL && !quiet) { fprintf(stderr, "Warning: --undeploy-data-file already set. Overriding...\n"); } undeploy_file = argv[i] + 21; if (strlen(undeploy_file) == 0) { fprintf(stderr, "ERROR: Undeploy data file has a zero-length name!\n"); return EXIT_FAILURE; } } else { if (device != NULL) { // [GPT partition index] part_ndx = argv[i]; // TODO: Make this non-positional? } else if ((device = fopen(argv[i], "r+b")) == NULL) { // perror("ERROR"); return EXIT_FAILURE; } } } if (device == NULL) { fprintf(stderr, "ERROR: No device specified\n"); usage(argv[0]); return EXIT_FAILURE; } if (!device_init()) { goto undeploy_mode_cleanup; } if (undeploy_mode) { if (undeploy_file == NULL) { fprintf(stderr, "ERROR: Undeploy mode set but no --undeploy-data-file=... passed.\n"); goto undeploy_mode_cleanup; } if (!load_undeploy_data(undeploy_file)) { goto undeploy_mode_cleanup; } undeploy(); ok = EXIT_SUCCESS; goto undeploy_mode_cleanup; } // Probe for GPT and logical block size int gpt = 0; struct gpt_table_header gpt_header; uint64_t lb_guesses[] = { 512, 4096 }; uint64_t lb_size = 0; for (size_t i = 0; i < sizeof(lb_guesses) / sizeof(uint64_t); i++) { device_read(&gpt_header, lb_guesses[i], sizeof(struct gpt_table_header)); if (!strncmp(gpt_header.signature, "EFI PART", 8)) { lb_size = lb_guesses[i]; if (!force_mbr) { gpt = 1; if (!quiet) { fprintf(stderr, "Deploying to GPT. Logical block size of %" PRIu64 " bytes.\n", lb_guesses[i]); } } else { fprintf(stderr, "ERROR: Device has a valid GPT, refusing to force MBR.\n"); goto cleanup; } break; } } struct gpt_table_header secondary_gpt_header; if (gpt) { if (!quiet) { fprintf(stderr, "Secondary header at LBA 0x%" PRIx64 ".\n", ENDSWAP(gpt_header.alternate_lba)); } device_read(&secondary_gpt_header, lb_size * ENDSWAP(gpt_header.alternate_lba), sizeof(struct gpt_table_header)); if (!strncmp(secondary_gpt_header.signature, "EFI PART", 8)) { if (!quiet) { fprintf(stderr, "Secondary header valid.\n"); } } else { fprintf(stderr, "ERROR: Secondary header not valid, aborting.\n"); goto cleanup; } } int mbr = 0; if (gpt == 0) { // Do all sanity checks on MBR mbr = 1; uint8_t hint8 = 0; uint16_t hint16 = 0; bool any_active = false; device_read(&hint8, 446, sizeof(uint8_t)); if (hint8 != 0x00 && hint8 != 0x80) { if (!force_mbr) { mbr = 0; } else { hint8 = hint8 & 0x80 ? 0x80 : 0x00; device_write(&hint8, 446, sizeof(uint8_t)); } } any_active = any_active ? any_active : (hint8 & 0x80) != 0; device_read(&hint8, 462, sizeof(uint8_t)); if (hint8 != 0x00 && hint8 != 0x80) { if (!force_mbr) { mbr = 0; } else { hint8 = hint8 & 0x80 ? 0x80 : 0x00; device_write(&hint8, 462, sizeof(uint8_t)); } } any_active = any_active ? any_active : (hint8 & 0x80) != 0; device_read(&hint8, 478, sizeof(uint8_t)); if (hint8 != 0x00 && hint8 != 0x80) { if (!force_mbr) { mbr = 0; } else { hint8 = hint8 & 0x80 ? 0x80 : 0x00; device_write(&hint8, 478, sizeof(uint8_t)); } } any_active = any_active ? any_active : (hint8 & 0x80) != 0; device_read(&hint8, 494, sizeof(uint8_t)); if (hint8 != 0x00 && hint8 != 0x80) { if (!force_mbr) { mbr = 0; } else { hint8 = hint8 & 0x80 ? 0x80 : 0x00; device_write(&hint8, 494, sizeof(uint8_t)); } } any_active = any_active ? any_active : (hint8 & 0x80) != 0; char hintc[64]; device_read(hintc, 4, 8); if (memcmp(hintc, "_ECH_FS_", 8) == 0) { if (!force_mbr) { mbr = 0; } else { memset(hintc, 0, 8); device_write(hintc, 4, 8); } } device_read(hintc, 3, 4); if (memcmp(hintc, "NTFS", 4) == 0) { if (!force_mbr) { mbr = 0; } else { memset(hintc, 0, 4); device_write(hintc, 3, 4); } } device_read(hintc, 54, 3); if (memcmp(hintc, "FAT", 3) == 0) { if (!force_mbr) { mbr = 0; } else { memset(hintc, 0, 5); device_write(hintc, 54, 5); } } device_read(hintc, 82, 3); if (memcmp(hintc, "FAT", 3) == 0) { if (!force_mbr) { mbr = 0; } else { memset(hintc, 0, 5); device_write(hintc, 82, 5); } } device_read(hintc, 3, 5); if (memcmp(hintc, "FAT32", 5) == 0) { if (!force_mbr) { mbr = 0; } else { memset(hintc, 0, 5); device_write(hintc, 3, 5); } } device_read(&hint16, 1080, sizeof(uint16_t)); hint16 = ENDSWAP(hint16); if (hint16 == 0xef53) { if (!force_mbr) { mbr = 0; } else { hint16 = 0; hint16 = ENDSWAP(hint16); device_write(&hint16, 1080, sizeof(uint16_t)); } } if (mbr && !any_active) { if (!quiet) { fprintf(stderr, "No active partition found, some systems may not boot.\n"); fprintf(stderr, "Setting partition 1 as active to work around the issue...\n"); } hint8 = 0x80; device_write(&hint8, 446, sizeof(uint8_t)); } } if (gpt == 0 && mbr == 0) { fprintf(stderr, "ERROR: Could not determine if the device has a valid partition table.\n"); fprintf(stderr, " Please ensure the device has a valid MBR or GPT.\n"); fprintf(stderr, " Alternatively, pass `--force-mbr` to override these checks.\n"); fprintf(stderr, " **ONLY DO THIS AT YOUR OWN RISK, DATA LOSS MAY OCCUR!**\n"); goto cleanup; } size_t stage2_size = bootloader_file_size - 512; size_t stage2_sects = DIV_ROUNDUP(stage2_size, 512); uint16_t stage2_size_a = (stage2_sects / 2) * 512 + (stage2_sects % 2 ? 512 : 0); uint16_t stage2_size_b = (stage2_sects / 2) * 512; // Default split of stage2 for MBR (consecutive in post MBR gap) uint64_t stage2_loc_a = 512; uint64_t stage2_loc_b = stage2_loc_a + stage2_size_a; if (gpt) { if (part_ndx != NULL) { uint32_t partition_num; sscanf(part_ndx, "%" SCNu32, &partition_num); partition_num--; if (partition_num > ENDSWAP(gpt_header.number_of_partition_entries)) { fprintf(stderr, "ERROR: Partition number is too large.\n"); goto cleanup; } struct gpt_entry gpt_entry; device_read(&gpt_entry, (ENDSWAP(gpt_header.partition_entry_lba) * lb_size) + (partition_num * ENDSWAP(gpt_header.size_of_partition_entry)), sizeof(struct gpt_entry)); if (gpt_entry.unique_partition_guid[0] == 0 && gpt_entry.unique_partition_guid[1] == 0) { fprintf(stderr, "ERROR: No such partition.\n"); goto cleanup; } if (!quiet) { fprintf(stderr, "GPT partition specified. Deploying there instead of embedding.\n"); } stage2_loc_a = ENDSWAP(gpt_entry.starting_lba) * lb_size; stage2_loc_b = stage2_loc_a + stage2_size_a; if (stage2_loc_b & (lb_size - 1)) stage2_loc_b = (stage2_loc_b + lb_size) & ~(lb_size - 1); } else { if (!quiet) { fprintf(stderr, "GPT partition NOT specified. Attempting GPT embedding.\n"); } int64_t max_partition_entry_used = -1; for (int64_t i = 0; i < (int64_t)ENDSWAP(gpt_header.number_of_partition_entries); i++) { struct gpt_entry gpt_entry; device_read(&gpt_entry, (ENDSWAP(gpt_header.partition_entry_lba) * lb_size) + (i * ENDSWAP(gpt_header.size_of_partition_entry)), sizeof(struct gpt_entry)); if (gpt_entry.unique_partition_guid[0] != 0 || gpt_entry.unique_partition_guid[1] != 0) { if (i > max_partition_entry_used) max_partition_entry_used = i; } } stage2_loc_a = (ENDSWAP(gpt_header.partition_entry_lba) + 32) * lb_size; stage2_loc_a -= stage2_size_a; stage2_loc_a &= ~(lb_size - 1); stage2_loc_b = (ENDSWAP(secondary_gpt_header.partition_entry_lba) + 32) * lb_size; stage2_loc_b -= stage2_size_b; stage2_loc_b &= ~(lb_size - 1); size_t partition_entries_per_lb = lb_size / ENDSWAP(gpt_header.size_of_partition_entry); size_t new_partition_array_lba_size = stage2_loc_a / lb_size - ENDSWAP(gpt_header.partition_entry_lba); size_t new_partition_entry_count = new_partition_array_lba_size * partition_entries_per_lb; if ((int64_t)new_partition_entry_count <= max_partition_entry_used) { fprintf(stderr, "ERROR: Cannot embed because there are too many used partition entries.\n"); goto cleanup; } if (!quiet) { fprintf(stderr, "New maximum count of partition entries: %zu.\n", new_partition_entry_count); } // Zero out unused partitions void *empty = calloc(1, ENDSWAP(gpt_header.size_of_partition_entry)); for (size_t i = max_partition_entry_used + 1; i < new_partition_entry_count; i++) { device_write(empty, ENDSWAP(gpt_header.partition_entry_lba) * lb_size + i * ENDSWAP(gpt_header.size_of_partition_entry), ENDSWAP(gpt_header.size_of_partition_entry)); } for (size_t i = max_partition_entry_used + 1; i < new_partition_entry_count; i++) { device_write(empty, ENDSWAP(secondary_gpt_header.partition_entry_lba) * lb_size + i * ENDSWAP(secondary_gpt_header.size_of_partition_entry), ENDSWAP(secondary_gpt_header.size_of_partition_entry)); } free(empty); uint8_t *partition_array = malloc(new_partition_entry_count * ENDSWAP(gpt_header.size_of_partition_entry)); if (partition_array == NULL) { perror("ERROR"); goto cleanup; } device_read(partition_array, ENDSWAP(gpt_header.partition_entry_lba) * lb_size, new_partition_entry_count * ENDSWAP(gpt_header.size_of_partition_entry)); uint32_t crc32_partition_array = crc32(partition_array, new_partition_entry_count * ENDSWAP(gpt_header.size_of_partition_entry)); free(partition_array); gpt_header.partition_entry_array_crc32 = ENDSWAP(crc32_partition_array); gpt_header.number_of_partition_entries = ENDSWAP(new_partition_entry_count); gpt_header.crc32 = 0; gpt_header.crc32 = crc32(&gpt_header, 92); gpt_header.crc32 = ENDSWAP(gpt_header.crc32); device_write(&gpt_header, lb_size, sizeof(struct gpt_table_header)); secondary_gpt_header.partition_entry_array_crc32 = ENDSWAP(crc32_partition_array); secondary_gpt_header.number_of_partition_entries = ENDSWAP(new_partition_entry_count); secondary_gpt_header.crc32 = 0; secondary_gpt_header.crc32 = crc32(&secondary_gpt_header, 92); secondary_gpt_header.crc32 = ENDSWAP(secondary_gpt_header.crc32); device_write(&secondary_gpt_header, lb_size * ENDSWAP(gpt_header.alternate_lba), sizeof(struct gpt_table_header)); } } else { if (!quiet) { fprintf(stderr, "Deploying to MBR.\n"); } } if (!quiet) { fprintf(stderr, "Stage 2 to be located at 0x%" PRIx64 " and 0x%" PRIx64 ".\n", stage2_loc_a, stage2_loc_b); } // Save original timestamp device_read(timestamp, 218, 6); // Save the original partition table of the device device_read(orig_mbr, 440, 70); // Write the bootsector from the bootloader to the device device_write(&bootloader_img[0], 0, 512); // Write the rest of stage 2 to the device device_write(&bootloader_img[512], stage2_loc_a, stage2_size_a); device_write(&bootloader_img[512 + stage2_size_a], stage2_loc_b, stage2_size - stage2_size_a); // Hardcode in the bootsector the location of stage 2 halves stage2_size_a = ENDSWAP(stage2_size_a); device_write(&stage2_size_a, 0x1a4 + 0, sizeof(uint16_t)); stage2_size_b = ENDSWAP(stage2_size_b); device_write(&stage2_size_b, 0x1a4 + 2, sizeof(uint16_t)); stage2_loc_a = ENDSWAP(stage2_loc_a); device_write(&stage2_loc_a, 0x1a4 + 4, sizeof(uint64_t)); stage2_loc_b = ENDSWAP(stage2_loc_b); device_write(&stage2_loc_b, 0x1a4 + 12, sizeof(uint64_t)); // Write back timestamp device_write(timestamp, 218, 6); // Write back the saved partition table to the device device_write(orig_mbr, 440, 70); if (!device_flush_cache()) goto cleanup; if (!quiet) { fprintf(stderr, "Reminder: Remember to copy the limine.sys file in either\n" " the root, /boot, /limine, or /boot/limine directories of\n" " one of the partitions on the device, or boot will fail!\n"); fprintf(stderr, "Limine deployed successfully!\n"); } ok = EXIT_SUCCESS; cleanup: reverse_undeploy_data(); if (ok != EXIT_SUCCESS) { // If we failed, attempt to reverse deploy process undeploy(); } else if (undeploy_file != NULL) { store_undeploy_data(undeploy_file); } undeploy_mode_cleanup: free_undeploy_data(); if (cache) free(cache); if (device != NULL) fclose(device); return ok; }