Added test for real self-modifying code

This commit is contained in:
Andrew Dutcher 2016-08-14 23:21:38 -07:00
parent 97b10da133
commit 42949408ca
3 changed files with 88 additions and 0 deletions

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#!/usr/bin/env python
from unicorn import *
from unicorn.x86_const import *
from struct import pack
import os
import regress
CODE_ADDR = 0x08048000
STACK_ADDR = 0x2000000
CODE = open(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'x86_self_modifying.elf')).read()
CODE_SIZE = len(CODE) + (0x1000 - len(CODE)%0x1000)
STACK_SIZE = 0x8000
ENTRY_POINT = 0x8048074
def hook_intr(uc, intno, data):
uc.emu_stop()
class SelfModifying(regress.RegressTest):
def test_self_modifying(self):
uc = Uc(UC_ARCH_X86, UC_MODE_32)
uc.mem_map(CODE_ADDR, CODE_SIZE, 5)
uc.mem_map(STACK_ADDR, STACK_SIZE, 7)
uc.mem_write(CODE_ADDR, CODE)
uc.reg_write(UC_X86_REG_ESP, STACK_ADDR + STACK_SIZE)
uc.hook_add(UC_HOOK_INTR, hook_intr)
uc.emu_start(ENTRY_POINT, -1)
retcode = uc.reg_read(UC_X86_REG_EBX)
self.assertEqual(retcode, 65)
if __name__ == '__main__':
regress.main()

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.intel_syntax noprefix
.global _start
_start:
mov ebp, esp
sub ebp, 0x4000
mov edx, ebp
lea esi, [self_modifying]
mov edi, ebp
mov ecx, 0x2d
call memcpy
add ebp, 0x2d
xor ebx, ebx
call edx
mov eax, 1
int 0x80
memcpy:
cmp ecx, 0
je _end
dec ecx
mov al, byte ptr [esi+ecx]
mov byte ptr [edi+ecx], al
jmp memcpy
_end:
ret
self_modifying:
inc ebx
call $+5
pop esi
dec byte ptr [esi+11]
xor edx, edx
sub esi, 6
_loop_start:
cmp edx, 5
jz _loop_end
mov edi, ebp
mov ecx, 0x2d
lea eax, [memcpy]
call eax
inc edx
add ebp, 0x2d
mov byte ptr [ebp], 0xc3
jmp _loop_start
_loop_end: