#!/usr/bin/python # # Copyright 2010 The Native Client Authors. All rights reserved. Use # of this source code is governed by a BSD-style license that can be # found in the LICENSE file. # # This tool generates bad x86_64 NaCl modules that should never be # generated by a conformant compiler. These bad modules are used to # test that sel_ldr correctly detects that these are bad modules. # # The detailed info about the fib_scalar.nexe used as input: # $ readelf -l fib_scalar.nexe # # Elf file type is EXEC (Executable file) # Entry point 0x20080 # There are 4 program headers, starting at offset 64 # # Program Headers: # Type Offset VirtAddr PhysAddr # FileSiz MemSiz Flags Align # PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 # 0x0000000000000120 0x0000000000000120 R 8 # LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 # 0x00000000000277c0 0x00000000000277c0 R E 200000 # LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 # 0x0000000000206054 0x0000000000206054 R 200000 # LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 # 0x0000000000000994 0x0000000000001c68 RW 200000 # # Section to Segment mapping: # Segment Sections... # 00 # 01 .init .text .fini # 02 .rodata .nacl_rpc_methods .eh_frame_hdr .eh_frame .tdata .ctors .dtors .jcr # 03 .data .bss import sys EHDR_SIZE=64 PHDR_SIZE=56 P_MEMSZ_OFF=(5*8) FILE_MODIFICATIONS=[ ## $ readelf -l data_not_last.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x00000000500277a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000206054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x0000000000001c68 RW 200000 ## Section to Segment mapping: ## Segment Sections... ## 00 ## 01 .init .text .fini .bss ## 02 .rodata .nacl_rpc_methods .eh_frame_hdr .eh_frame .tdata .ctors .dtors .jcr ## 03 .data .bss [ "fib_scalar.nexe", "data_not_last.nexe", [ ( EHDR_SIZE + PHDR_SIZE + P_MEMSZ_OFF + 3, chr(0x50)), ] ], ## $ readelf -l negative_hole.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x00000000000277a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000206054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x00000000ff9ffff0 RW 200000 ## Section to Segment mapping: ## Segment Sections... ## 00 ## 01 .init .text .fini ## 02 .rodata .nacl_rpc_methods .eh_frame_hdr .eh_frame .tdata .ctors .dtors .jcr ## 03 .data .bss [ "fib_scalar.nexe", "negative_hole.nexe", [ ( EHDR_SIZE + 3*PHDR_SIZE + P_MEMSZ_OFF + 3, chr(0xff)), ( EHDR_SIZE + 3*PHDR_SIZE + P_MEMSZ_OFF + 2, chr(0x9f)), ( EHDR_SIZE + 3*PHDR_SIZE + P_MEMSZ_OFF + 1, chr(0xff)), ( EHDR_SIZE + 3*PHDR_SIZE + P_MEMSZ_OFF + 0, chr(0xf0)), ], ], ## $ readelf -l rodata_data_overlap.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x00000000000277a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000401054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x0000000000001c68 RW 200000 ## Section to Segment mapping: ## Segment Sections... ## 00 ## 01 .init .text .fini ## 02 .rodata .nacl_rpc_methods .eh_frame_hdr .eh_frame .tdata .ctors .dtors .jcr ## 03 .data .bss [ "fib_scalar.nexe", "rodata_data_overlap.nexe", [ ( EHDR_SIZE + 2*PHDR_SIZE + P_MEMSZ_OFF + 2, chr(0x40)), ( EHDR_SIZE + 2*PHDR_SIZE + P_MEMSZ_OFF + 1, chr(0x10)), ] ], ## $ readelf -l text_too_big.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x000000f0000277a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000206054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x0000000000001c68 RW 200000 [ "fib_scalar.nexe", "text_too_big.nexe", [ ( EHDR_SIZE + PHDR_SIZE + P_MEMSZ_OFF + 4, chr(0xf0)), ], ], ## $ readelf -l integer_overflow_while_madvising.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x0000000f000277a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000206054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x0000000000001c68 RW 200000 [ "fib_scalar.nexe", "integer_overflow_while_madvising.nexe", [ ( EHDR_SIZE + PHDR_SIZE + P_MEMSZ_OFF + 4, chr(0x0f)), ], ], ## $ readelf -l text_overlaps_data.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x00000000005e10a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000206054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x0000000000001c68 RW 200000 [ "fib_scalar.nexe", "text_overlaps_data.nexe", [ ( EHDR_SIZE + PHDR_SIZE + P_MEMSZ_OFF + 2, chr(0x5e)), ( EHDR_SIZE + PHDR_SIZE + P_MEMSZ_OFF + 1, chr(0x10)), ], ], ## $ readelf -l text_overlaps_rodata.nexe ## Program Headers: ## Type Offset VirtAddr PhysAddr ## FileSiz MemSiz Flags Align ## PHDR 0x0000000000000000 0x0000000000000000 0x0000000000000000 ## 0x0000000000000120 0x0000000000000120 R 8 ## LOAD 0x0000000000020000 0x0000000000020000 0x0000000000020000 ## 0x00000000000277a0 0x00000000002077a0 R E 200000 ## LOAD 0x0000000000200000 0x0000000000200000 0x0000000000200000 ## 0x0000000000206054 0x0000000000206054 R 200000 ## LOAD 0x0000000000600000 0x0000000000600000 0x0000000000600000 ## 0x0000000000000994 0x0000000000001c68 RW 200000 [ "fib_scalar.nexe", "text_overlaps_rodata.nexe", [ ( EHDR_SIZE + PHDR_SIZE + P_MEMSZ_OFF + 2, chr(0x20)), ], ], ] def UpdateData(data, change_list): for ix, replacement_byte in change_list: data = data[:ix] + replacement_byte + data[ix+1:] return data def UpdateFileWithChangeList(src_file, dst_file, change_list): data = open(src_file).read() data = UpdateData(data, change_list) open(dst_file, 'w').write(data) if __name__ == '__main__': for src_file, dst_file, cl in FILE_MODIFICATIONS: UpdateFileWithChangeList(src_file, dst_file, cl) sys.exit(0)