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#!/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)
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