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codeins.py
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import re, random, string, os, sys, time
CODE_SEG_LEN = 100
TOPN_FREQUENT_FUNCS= 10
INIT_FUNC_NAME = 'ATinit'
COUNTER_NAME = 'ab_count'
FUNC_BUF_NAME = 'funcs_buf'
FUNC_PTR_NAME = 'funcs'
INDEX_NAME = 'funcs_idx'
FUNC_PTR_TYPE_SUFFIX = 'ptr'
INTERMEDIATE_IDENT = 'itm'
REPATED_INS = 'nop'
LANDING_LEN = 1500
MAXIMUM_OVERLOAD_VALUE = 255 # Better no more than 1000
VARMAPPING_BIT = 6
def get_random_string(length_limit):
# At least four bytes for randomness
length = random.randint(4, length_limit)
letters = string.ascii_letters
result_str = ''.join(random.choice(letters) for i in range(length))
return result_str
def make_pattern(s):
s = s.replace("\\", "\\\\").replace("*", "\\*").replace("(", "\\(").replace(")", "\\)").replace(".", "\\.").replace("+", '\\+').replace("[", '\\[').replace("]", '\\]').replace("?", "\\?").replace("/", '\\/').replace("|", '\\|')
# Replace spaces with \s
s = ' '.join(s.split())
s = s.replace(" ", '\\s*')
return s
def make_typedef(func_name, l):
ret_type = l[0]
var_type = l[1:]
var_type = ','.join(var_type)
os. sys
template = 'typedef {0} (*{1}'+FUNC_PTR_TYPE_SUFFIX+') ({2});'
return template.format(ret_type, func_name, var_type)
def check_if_constvar(var_name):
allow_chars = string.ascii_uppercase + "_" + string.digits
for ch in var_name:
if ch not in allow_chars:
return False
return True
def check_nested(operand):
stack = 0
for ch in operand:
if ch == '(':
stack += 1
if ch == ")":
stack -= 1
if stack != 0:
return True
return False
class Antifuzz:
# Antifuzz for C
def __init__(self, sources, funcchain = True, daemon_process = True, constrans = True, landingspace=True, instru_detect=True):
self.sources = sources
self.funcchain = landingspace
self.constrans = constrans
self.landingspace = landingspace
self.instru_detect = instru_detect
self.daemon_process = daemon_process
# To use landingspace, must use funcchain for functions containing jump instructions
if self.landingspace:
self.funcchain = True
# self.funcPattern = r"(\w+\s*[\*,&]*)\s+(\w+)\s*\(([^,{})]*),([^,{})]*)\)"
self.commonFuncs = ['bool', 'int', 'char', 'void', 'float', 'long', 'double', 'wchar_t']
self.userDefinedTypes = ['bfd_boolean', 'Filedata']
self.noHandleCmpsOperands = ['NULL', '0', '-1', '1']
self.funcsList = []
self.funcCallCnt = {}
self.toTransFunc = {}
self.funcPtr = {}
self.fakecodes = {}
self.ori_itm_funcs = {}
self.def_codes = '''
#include<stdlib.h>
#include<time.h>
'''
self.available_opcodes = {'nop': '0x90', 'cmc': '0xf5', 'clc': '0xf8', 'stc': '0xf9', 'add ${0}, %al': '0x04', 'adc ${0},%al':'0x14', 'and ${0}, %al':'0x24', 'xor ${0}, %al': '0x34'}
self.opcode_check = {'nop': '0x90', 'cmc': '0xf5', 'clc': '0xf8', 'stc': '0xf9', 'cli':'0xfa', 'sti':'0xfb', 'add': '0x04', 'adc':'0x14', 'and':'0x24', 'xor': '0x34',
'jmp':'0xeb'}
if self.instru_detect:
self.detect_codes = '''
#include<stdlib.h>
#include<time.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <stdint.h>
#include <unistd.h>
#define abs(x) ((a>0)?(a):(-a))
unsigned long long atfz_t2, atfz_t1;
void in_loop(){ int a=0, b=1, i; for (i =0 ; i < 1000; i++)a+=b; return;}
uint64_t rdtsc(){
unsigned int lo,hi;
__asm__ ("CPUID");
__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
return ((uint64_t)hi << 32) | lo;
}
void delay(void)
{
fd_set set;
struct timeval timeout;
int rv;
char buff[100];
int len = 90;
int stdinput = dup(STDIN_FILENO);
int filedesc = open(stdinput, O_WRONLY);
FD_ZERO(&set); /* clear the set */
//FD_SET(filedesc, &set); /* add our file descriptor to the set */
timeout.tv_sec = 1;
timeout.tv_usec = 0;
rv = select(filedesc + 1, &set, NULL, NULL, &timeout);
if(rv == -1)
perror("select"); /* an error accured */
else if(rv == 0)
printf("timeout"); /* a timeout occured */
else
read( filedesc, buff, len ); /* there was data to read */
close(filedesc);
}
void anti_fuzz(){
// direct delay, can be replaced by a series of calculations or even abort/block the program
delay();
}
void detect() {
unsigned long long t2 , t1, t3, t4;
unsigned long long diff1, diff2;
t3 = rdtsc () ;
in_loop();
t4 = rdtsc () ;
t1 = rdtsc () ;
int a=0, b=1, i;
for (i =0 ; i < 1000; i++)a+=b;
t2 = rdtsc () ;
diff1 = (t2-t1);
diff2 = (t4-t3);
double perc = (double)(diff2)/(diff1) * 100;
printf("%llu, %llu, %llu, %llu\\n", t1, t2, t3, t4);
printf("%llu, %llu, %lf\\n", diff2, diff1, perc);
if (perc > 130) anti_fuzz();
}
'''
if self.daemon_process:
self.daemon_process_codes = '''
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#define ERR_EXIT(m) \
do\
{\
perror(m);\
exit(EXIT_FAILURE);\
}\
while (0);\
#define START_FD 1000
#define ATFZ_ALERT_NUM 60
#define PATROL_TIME 30
#define ATFZ_PREFIX ("/tmp/.atfz_deamon")
void creat_daemon(void)
{
pid_t pid;
pid = fork();
if( pid == -1)
ERR_EXIT("fork error");
if(pid == 0 )
{
if(setsid() == -1)
ERR_EXIT("SETSID ERROR");
umask(0);
int atfz_cnt = 1;
char atfz_file[30], dest_file[30];
FILE *fp;
sprintf(dest_file, "%s%d", ATFZ_PREFIX, ATFZ_ALERT_NUM);
fp = fopen(dest_file, "r");
if (fp)
exit(EXIT_SUCCESS);
while (atfz_cnt <= ATFZ_ALERT_NUM){
sprintf(atfz_file, "%s%d", ATFZ_PREFIX, atfz_cnt);
fp = fopen(atfz_file, "r");
if (!fp){
break;
}
atfz_cnt++;
}
sprintf(atfz_file, "%s%d", ATFZ_PREFIX, atfz_cnt);
fp = fopen(atfz_file, "w");
sleep(PATROL_TIME);
fclose(fp);
printf("%s\\n", atfz_file);
if (atfz_cnt < ATFZ_ALERT_NUM)
remove(atfz_file);
exit(EXIT_SUCCESS);
}
return;
}
'''
def gen_ins(self, length, func_name):
random.seed(time.time())
ins_list = list(self.available_opcodes.keys())
land_sp = []
for i in range(length-1):
pos = random.randint(0, len(ins_list)-1)
ins = ins_list[pos]
opcode = self.available_opcodes[ins]
land_sp.append(ins)
pos = random.randint(0, len(ins_list)-5)
ins = ins_list[pos]
opcode = self.available_opcodes[ins]
land_sp.append(ins)
#print(land_sp)
# insert jump
i = 0
while (i < length-1):
if "xor" in land_sp[i+1] or "and" in land_sp[i+1] or "adc" in land_sp[i+1]:
next_opcode = int(self.opcode_check[land_sp[i+1][:3]], 16)
#print(next_opcode)
if (next_opcode + i +2 < length):
land_sp[i] = "jmp {0}+{1}".format(func_name, i+next_opcode+2)
if (i>0) and "and" in land_sp[i-1] or "xor" in land_sp[i-1] or "adc" in land_sp[i-1] or "add" in land_sp[i-1]:
pos = random.randint(0, len(ins_list)-5)
ins = ins_list[pos]
land_sp[i-1] = ins
#i+=jump_gap
i = next_opcode + i + 1
i+= 1
for i in range(length-1):
if "{0}" in land_sp[i]:
#print(land_sp[i])
land_sp[i] = land_sp[i].format(self.opcode_check[land_sp[i+1][:3]])
i = 0
while(i < len(land_sp)-1):
if "jmp" in land_sp[i] or "adc" in land_sp[i] or "add" in land_sp[i] or "and" in land_sp[i] or "xor" in land_sp[i]:
land_sp = land_sp[:i+1] + land_sp[i+2:]
i+= 1
asb_codes = ('\\n'.join(land_sp) + "\\n")
return asb_codes
def genFakeFunc(self, func_type, argu, func_name, func_number):
intermidiate_junk_template = '''
extern {0} {1} ({2}) __attribute__((used));
extern {0} {1} ({2});
__asm__ (
"{1}:\\n"
" {4}"
" jmp {3}\\n"
);
'''
if self.landingspace:
fake_func_ret_template = '''
{0} {1}({2}) __attribute__((used));
{0} {1}({2}){{
{7}
int {3} = '''+INDEX_NAME+'''['''+COUNTER_NAME+'''++];
{8} {4} = (({6})('''+FUNC_PTR_NAME+'''[{3}]+rand()%'''+str(LANDING_LEN+1)+'''))({5});
return {4};
}}
'''
fake_func_void_template = '''
void {0}({1}) __attribute__((used));
void {0}({1}){{
{5}
int {2} = '''+INDEX_NAME+'''['''+COUNTER_NAME+'''++];
(({4})('''+FUNC_PTR_NAME+'''[{2}]+rand()%'''+str(LANDING_LEN+1)+'''))({3});
return;
}}
'''
else:
fake_func_ret_template = '''
{0} {1}({2}) __attribute__((used));
{0} {1}({2}){{
{7}
int {3} = '''+INDEX_NAME+'''['''+COUNTER_NAME+'''++];
{8} {4} = (({6})('''+FUNC_PTR_NAME+'''[{3}]))({5});
return {4};
}}
'''
fake_func_void_template = '''
void {0}({1}) __attribute__((used));
void {0}({1}){{
{5}
int {2} = '''+INDEX_NAME+'''['''+COUNTER_NAME+'''++];
(({4})('''+FUNC_PTR_NAME+'''[{2}]))({3});
return;
}}
'''
argu_list = argu.split(',')
var_list = []
idx_name = get_random_string(5)
self.funcPtr[func_name] = [func_type]
for i in range(len(argu_list)):
# No need to care about pointer
tmp = argu_list[i].replace("register ", "").replace("const ", '').replace("ATTRIBUTE_UNUSED", '').strip().replace("*", '').replace("unsigned", '').replace("signed",'').replace("[]", '').split()
tmp = [j for j in tmp if j != '']
# Ignore arguments with function pointers
if len(tmp) >= 3:
del self.funcPtr[func_name]
if self.landingspace:
return None, None, None, None
else:
return None, None, None
if len(tmp) > 1:
var = tmp[1]
if func_name == 'map_over_members':
print(tmp)
var_list.append(var)
rev_argu = argu_list[i][::-1]
var_type = rev_argu.replace(var[::-1], '', 1).strip()[::-1]
self.funcPtr[func_name].append(var_type)
vars = ','.join(var_list)
code_seg = ''
# fake_func_name = get_random_string(5)
fake_func_name = func_name
fake_key_seg = ''
for i in range(func_number):
if func_type.lower() == 'void':
if self.landingspace:
itm_func = intermidiate_junk_template.format('void', fake_func_name+INTERMEDIATE_IDENT+str(i), argu, fake_func_name + str(i), self.gen_ins(LANDING_LEN, fake_func_name+INTERMEDIATE_IDENT+str(i)))
fake_func = fake_func_void_template.format(fake_func_name + str(i), argu, idx_name, vars, func_name+FUNC_PTR_TYPE_SUFFIX, '')
fake_key_seg = fake_func.strip('\n').split("\n")
fake_key_seg = [j for j in fake_key_seg if j.strip() != '']
fake_key_seg = fake_key_seg[1:3]
else:
if self.landingspace:
itm_func = intermidiate_junk_template.format(func_type, fake_func_name+INTERMEDIATE_IDENT+str(i), argu, fake_func_name + str(i), self.gen_ins(LANDING_LEN, fake_func_name+INTERMEDIATE_IDENT+str(i)))
ret_name = get_random_string(10)
rettype = func_type.strip()
if rettype.startswith("local "):
rettype = rettype[6:]
fake_func = fake_func_ret_template.format(func_type, fake_func_name+str(i), argu, idx_name, ret_name, vars, func_name+FUNC_PTR_TYPE_SUFFIX, '', rettype)
fake_key_seg = fake_func.strip('\n').strip().split("\n")
fake_key_seg = [j for j in fake_key_seg if j.strip() != '']
fake_key_seg = fake_key_seg[1:3]
code_seg += fake_func
if self.landingspace:
code_seg += itm_func
if func_type.lower() == 'void':
init_func = fake_func_void_template.format(fake_func_name+INIT_FUNC_NAME, argu, idx_name, vars, func_name + FUNC_PTR_TYPE_SUFFIX, COUNTER_NAME + ' = 0;\n'+FUNC_PTR_NAME+' = %s;')
init_func += "\nvoid {0}({1}) __attribute__((used));\n".format(fake_func_name, argu)
else:
ret_name = get_random_string(10)
rettype = func_type.strip()
if rettype.startswith("local "):
rettype = rettype[6:]
init_func = fake_func_ret_template.format(func_type, fake_func_name+INIT_FUNC_NAME, argu, idx_name, ret_name, vars, func_name + FUNC_PTR_TYPE_SUFFIX, COUNTER_NAME + ' = 0;\n'+FUNC_PTR_NAME+' = %s;', rettype)
init_func += "\n{0} {1}({2}) __attribute__((used));\n".format(func_type, fake_func_name, argu)
if self.landingspace:
origin_itm_func = intermidiate_junk_template.format(func_type, fake_func_name+INTERMEDIATE_IDENT, argu, fake_func_name, self.gen_ins(LANDING_LEN, fake_func_name+INTERMEDIATE_IDENT))
return code_seg, fake_key_seg, init_func, origin_itm_func
else:
return code_seg, fake_key_seg, init_func
def locateFuncBlk(self, search_pattern, codes):
start = -1
end = -1
stack = 1
res = re.search(search_pattern, codes)
start_def, end_def = res.span()
# In case codes[end_def] == "{"
while codes[end_def] != ")":
end_def -= 1
for idx in range(end_def, len(codes)):
# Main start
if codes[idx] == '{':
start = idx
break
for idx in range(start+1, len(codes)):
if codes[idx] == '{':
stack += 1
if codes[idx] == '}':
stack -= 1
if stack == 0:
end = idx
break
return (start, end, start_def)
def funcsIdentify(self):
'''
Functions in main, and 10 highest frequent used functions.
'''
content = ''
main_codes = ''
pages = []
for source in self.sources:
with open(source, "r") as f:
tmp = f.read()
content += tmp
pages.append(len(tmp))
self.content = content
# Search for high appearance functions
pattern = r"(\w+\s*[\*,&]*)\s+(\w+)\s*\(([^;<>\.()]*?)\)\s*{"
#print(pattern)
funcs = re.findall(pattern , content)
for func in funcs:
tmp = func[0].strip().strip("*").strip()
print(tmp, func[1])
if tmp in self.commonFuncs or tmp in self.userDefinedTypes:
#print(func)
self.funcsList.append(func)
for func in self.funcsList:
func_type = func[0]
func_name = func[1]
func_argument = func[2]
#print(func_name)
# Find main function
if func_name == 'main':
search_pattern ="%s\s*main\s*\(([^;]*?)\)"%(func_type)
start, end, _ = self.locateFuncBlk(search_pattern, content)
main_codes = content[start:end + 1]
pattern = r"[^\w]%s\s*\(([^;]*?)\)"%(func_name)
func_calls = re.findall(pattern, content)
cnt = 0
for call in func_calls:
if func_argument in call:
continue
cnt += 1
if cnt > 0:
self.funcCallCnt[func_name] = (cnt, func_type, func_argument)
fremap = sorted(self.funcCallCnt.items(), key=lambda x:x[1][0],
reverse=True)
fremap = fremap[:TOPN_FREQUENT_FUNCS]
for func_name, info in fremap:
func_type = info[1]
func_argument = info[2]
if func_name == "main":
continue
self.toTransFunc[func_name] = (func_type, func_argument)
del self.funcsList
# Search for functions inside main function
if main_codes == '':
raise RuntimeError("Cannot locate main function block")
for func_name, info in self.funcCallCnt.items():
func_type = info[1]
func_argument = info[2]
#print(func_name)
pattern = r"[^\w]%s\s*\(([^;]*?)\)" % (func_name)
func_calls = re.findall(pattern, main_codes)
if len(func_calls) > 0:
self.toTransFunc[func_name] = (func_type, func_argument)
#print(self.toTransFunc)
def funcTrans(self):
'''
int ab_count = 0;
int index[CODE_SEG_LEN] = {};
void** funcs;
void cal_idx()
{
int i,j;
for (i = 0; i < 1000; i++)index[i] = i;
for (i = 999; i > 0; i--){
j = rand()%(i+1);
swap(index[i], index[j]);
}
}
// Replace function call with
ab_count = 0;
int idx = index[ab_count++];
ret = ((fp)funcs[idx])(argu);
return ret
'''
earliest_fake_code = 99999999999999999
self.earliest_func = ''
# if len(self.toTransFunc) == 0:
# print("No functions identified")
# return
# Find function definitions, add fake path to definitions, and create their fake copies
init_funcs = {}
for func_name, func_info in self.toTransFunc.items():
if 'digest_check' == func_name:
continue
print("#####", func_name)
func_type = func_info[0]
ori_func_argument = func_info[1]
# Remove some control symbols for a better view
func_argument = ori_func_argument.strip().replace("\t", '').replace("\n", '').replace(" ", " ")
if self.landingspace:
added_code_seg, ins_code_seg, init_func, origin_itm_func = self.genFakeFunc(func_type, func_argument, func_name, CODE_SEG_LEN-1)
else:
added_code_seg, ins_code_seg, init_func = self.genFakeFunc(func_type, func_argument, func_name, CODE_SEG_LEN-1)
if added_code_seg is None:
continue
self.fakecodes[func_name] = ''
self.ori_itm_funcs[func_name] = ''
if self.landingspace:
self.ori_itm_funcs[func_name] = origin_itm_func
init_funcs[func_name] = init_func
func_type = make_pattern(func_type)
ori_func_argument = make_pattern(ori_func_argument)
# Match '{' avoid matching a declaration
search_pattern = "{0}\s*{1}\s*\(\s*{2}\s*\)\s*{{".format(func_type, func_name, ori_func_argument)
start, end, _ = self.locateFuncBlk(search_pattern, self.content)
func_code = self.content[start:end+1]
# TODO random insert a line
# func_code = func_code.split(";")
# print(func_code)
# ins_line = random.randint(1, len(func_code)-2)
ins_pos = -1
for j in range(len(func_code)):
if func_code[j] == '{':
ins_pos = j
break
if ins_pos == -1:
raise RuntimeError("Not find function start")
ins_code_seg = '\n'.join(ins_code_seg) + '}'
pre = func_code[:ins_pos+1]
next = func_code[ins_pos+1:]
func_code = pre + ins_code_seg + next
#print(func_code)
#if self.funcchain:
# self.content = self.content[:start]+func_code+self.content[end+1:]
self.fakecodes[func_name] += added_code_seg
cal_idx = '''
void swap(int *a, int *b)
{{
int temp = *a;
*a = *b;
*b = temp;
}}
static void **''' + FUNC_PTR_NAME + ''';
static int ''' + COUNTER_NAME + ''' = 0;
static int ''' + INDEX_NAME + '''[{0}] = {{}};
static void (*''' + FUNC_BUF_NAME + '''[''' + str(CODE_SEG_LEN * len(self.funcPtr)) + ''']) = {{}};
void cal_idx()
{{
int i,j;
for (i = 0; i < {0}; i++)'''+INDEX_NAME+'''[i] = i;
for (i = {0} - 1; i > 0; i--){{
j = rand() % (i+1);
swap(&'''+INDEX_NAME+'''[i], &'''+INDEX_NAME+'''[j]);
}}
}}
'''
if self.funcchain:
self.def_codes += cal_idx.format(CODE_SEG_LEN)
funcs_list = []
funcs_pos = {}
cnt = 0
# Function pointers type defs
for func_name, l in self.funcPtr.items():
self.fakecodes[func_name] = make_typedef(func_name, l) + '\n' + self.fakecodes[func_name]
real_func_pos = random.randint(0, CODE_SEG_LEN)
if self.landingspace:
tmp_list = [func_name+INTERMEDIATE_IDENT+str(id) for id in range(CODE_SEG_LEN-1)]
tmp_list = tmp_list[:real_func_pos] + [func_name+INTERMEDIATE_IDENT] + tmp_list[real_func_pos:]
else:
tmp_list = [func_name+str(id) for id in range(CODE_SEG_LEN-1)]
tmp_list = tmp_list[:real_func_pos] + [func_name] + tmp_list[real_func_pos:]
funcs_list += tmp_list
funcs_pos[func_name] = cnt
cnt += 1
# Function list fill addresses of functions
fill_funcs_codes = ''
if self.funcchain:
func_assignment = FUNC_BUF_NAME+'[{0}] = (void*){1};'
fill_funcs_codes += "\ntime_t timestamp;\nsrand((unsigned) time(×tamp));\ncal_idx();\n"
for i in range(len(funcs_list)):
fill_funcs_codes += func_assignment.format(i, funcs_list[i])
# Function calls initialization
for func_name,l in self.funcPtr.items():
if self.landingspace:
tmp = init_funcs[func_name].replace("rand()%", "rand()%%")
else:
tmp = init_funcs[func_name]
self.fakecodes[func_name] += tmp%('&'+FUNC_BUF_NAME+'[{0}]'.format(funcs_pos[func_name]*CODE_SEG_LEN))
if self.funcchain:
# Replace function calls with init functions
for func_name in self.funcPtr.keys():
func_argument = self.toTransFunc[func_name][1]
pattern = r"[^\w]%s\s*\(([^;]*?)\)\s*" % (func_name)
search_start = 0
res = re.search(pattern, self.content[search_start:])
while res is not None:
found_call = res.group()
call_start, new_start = res.span()
call_start += search_start
new_start += search_start
if "," in func_argument:
func_argument = func_argument.split(",")[0]
func_argument = func_argument.replace("ATTRIBUTE_UNUSED", "").strip()
if "*" in func_argument or " " in func_argument:
for tl in range(len(func_argument)-1, 0, -1):
if func_argument[tl] == "*" or func_argument[tl] == ' ':
func_argument = func_argument[:tl+1]
break
if re.search(make_pattern(func_argument), found_call) is not None:
search_start = new_start
else:
self.content = self.content[:call_start] + self.content[call_start:new_start].replace(func_name, func_name+INIT_FUNC_NAME, 1) + self.content[new_start:]
res = re.search(pattern, self.content[search_start:])
# Add fake function copies and initialization
for func_name in self.funcPtr.keys():
ori_func_type = self.toTransFunc[func_name][0]
func_argument = self.toTransFunc[func_name][1]
func_type = make_pattern(ori_func_type)
func_argument = make_pattern(func_argument)
with open("tmp.c", "w") as f:
f.write(self.content)
# Match '{' avoid matching a declaration
search_pattern = "(\s*extern\s*|\s*unsigned\s*|\s*inline\s*|\s*signed\s*|\s*static\s*|\s*local\s*|\s*const\s*)*\s*{0}\s*{1}\s*\(\s*{2}\s*\)\s*{{".format(func_type, func_name, func_argument)
_, func_end, start_def = self.locateFuncBlk(search_pattern, self.content)
function_def = self.content[start_def:_]
res = re.search(func_type, function_def)
func_pos, _ = res.span()
constraints = function_def[:func_pos].strip()
# Add constraints
self.ori_itm_funcs[func_name] = self.ori_itm_funcs[func_name].replace(ori_func_type+" "+func_name, constraints+" "+ori_func_type+" "+func_name)
self.fakecodes[func_name] = self.fakecodes[func_name].replace(ori_func_type+" "+func_name, constraints+" "+ori_func_type+" "+func_name)
if earliest_fake_code > start_def:
earliest_fake_code = start_def
if self.funcchain:
self.earliest_func = "(\s*extern\s*|\s*unsigned\s*|\s*inline\s*|\s*signed\s*|\s*static\s*|\s*local\s*|\s*const\s*)*\s*{0}\s*{1}\s*\(\s*{2}\s*\)\s*{{".format(func_type, func_name+"0", func_argument)
else:
self.earliest_func = "(\s*extern\s*|\s*unsigned\s*|\s*inline\s*|\s*signed\s*|\s*static\s*|\s*local\s*|\s*const\s*)*\s*{0}\s*{1}\s*\(\s*{2}\s*\)\s*{{".format(func_type, func_name, func_argument)
res = re.search(r'return\s(\w+);', self.fakecodes[func_name])
pos = 0
# static and extern are not for vars
constraints = constraints.replace("static", "").replace("extern", '').replace("local", '')
while res is not None:
var_name = res.groups()[0]
_, offset = res.span()
pos = pos + offset + len(constraints) + 2
self.fakecodes[func_name] = self.fakecodes[func_name].replace(ori_func_type+" "+var_name, constraints+" "+ori_func_type+" "+var_name)
res = re.search(r'return\s(\w+);', self.fakecodes[func_name][pos:])
self.ori_itm_funcs[func_name] = re.sub(r"extern\s*static", "extern ", self.ori_itm_funcs[func_name])
self.ori_itm_funcs[func_name] = re.sub(r"extern\s*local", "extern ", self.ori_itm_funcs[func_name])
self.fakecodes[func_name] = re.sub(r"extern\s*static", "extern ", self.fakecodes[func_name])
self.fakecodes[func_name] = re.sub(r"extern\s*local", "extern ", self.fakecodes[func_name])
#print(self.fakecodes[func_name])
if self.funcchain and not self.landingspace:
self.content = self.content[:start_def] + '\n' + self.fakecodes[func_name] + '\n' + self.content[start_def:]
if self.landingspace:
self.content = self.content[:start_def] + '\n' + self.fakecodes[func_name] + '\n' + self.content[start_def:func_end+1] + '\n' + self.ori_itm_funcs[func_name] + '\n' + self.content[func_end+1:]
# Find current main function
search_pattern = "[^\w]main\s*\(([^;]*?)\)"
start, end, _ = self.locateFuncBlk(search_pattern, self.content)
if self.instru_detect:
fill_funcs_codes += "\ndetect();\n"
if self.daemon_process:
fill_funcs_codes += '''
FILE *atfz_fp;
char dest_file[30];
sprintf(dest_file, "%s%d", ATFZ_PREFIX, ATFZ_ALERT_NUM);
atfz_fp = fopen(dest_file, "r");
if (atfz_fp){
printf("Fuzzer detected!\\n");
abort();
}
creat_daemon();
'''
self.content = self.content[:start+1] + fill_funcs_codes + self.content[start+1:]
def constraintIdentify(self):
pattern = r"(if\s*\(.+(=\s*=|<\s*=|<|[^-]>\s*=|[^-]>|!\s*=).+\s*((\|\|)|(&&).+)*\)[^'])|(switch\s*\(.*\)\s*)"
pattern2 = r"(if\s*\([^;{]+(=\s*=|<\s*=|<|[^-]>\s*=|[^-]>|!\s*=)[^;{]+?\s*((\|\|)|(&&)[^;{]+)*\))[^']"
res = re.findall(pattern, self.content)
switch_statements = []
cmp_statements = []
for cons in res:
if cons[-1] != '':
switch_statements.append(cons[-1].strip())
else:
cmp_statements.append(cons[0].strip())
res2 = re.findall(pattern2, self.content, re.DOTALL)
for cons in res2:
cmp_statements.append(cons[0].strip().replace("\n", ''))
# Reduce overheads, one type of statement only be changed in one position
self.switch_statements = list(set(switch_statements))
self.cmp_statements = sorted(list(set(cmp_statements)))
#print(self.cmp_statements)
def gs(self, num):
if num > 1 or num <= 0:
return num
base = 1
sum = 0
for i in range(8000):
sum += base
base *= num
return round(sum)
def cal_loop_num(self, limit):
if limit < 1:
raise RuntimeError("Limit should be greater than 1")
base = 1
sum = 0
num = 1-1/limit
cnt = 0
while abs(sum-limit) > 0.49:
sum += base
base *= num
cnt += 1
return cnt
def constraintTrans(self):
'''
gs only deal with variable values in [1, MAXIMUM_OVERLOAD_VALUE]
constants less than 1000 can always converge in less than 8000 rounds
'''
# Dirty hack on double values: /1000000
gs_template = '''
long gs(long a)
{
if(a == 0) return a;
int bit_num = 32;
if (a > 2147483647 || a < -2147483648) bit_num = 64;
if (bit_num == 32)
a = a & 0xffffffff;
long total_sum = 0, op;
int rep = 0;
do{
if ((a>>'''+str(VARMAPPING_BIT)+''') != 0){
op = a & ('''+str(1<<VARMAPPING_BIT)+'''-1);
a >>= '''+str(VARMAPPING_BIT)+''';
}
else {
op = a;
a = 0;
}
double num = (double)1-(double)1/(op);
double base = 1, sum = 0;
for (int i = 0; i < '''+str(self.cal_loop_num(1<<VARMAPPING_BIT))+'''; i++){
sum += base;
base *= num;
}
int tmp = (sum < 0 ? sum - 0.5 : sum + 0.5);
total_sum += ((long)tmp << (rep*'''+str(VARMAPPING_BIT)+'''));
rep++;
if ((rep+1)*'''+str(VARMAPPING_BIT)+''' >= bit_num){
a = a & ((1<<(bit_num - rep*'''+str(VARMAPPING_BIT)+'''))-1);
total_sum += ((long)a << (rep*'''+str(VARMAPPING_BIT)+'''));
break;
}
}while (a != 0);
return total_sum;
}
'''
self.def_codes += gs_template
for switch in self.switch_statements:
switch_pattern = r"[^\w]{0}[^\w]".format(make_pattern(switch))
res = re.search(switch_pattern, self.content)
start, end = res.span()
offset = self.content[start:end].find("switch")
start += offset+6
tmp = self.content[start:end]
argu = "gs({0})".format(tmp.strip())
print(tmp)
self.content = self.content[:start] +"(" + argu + ")" + self.content[end:]
argu_pattern = r'(.+)(=\s*=|<\s*=|<|[^-]>\s*=|[^-]>|!\s*=)(.+)'
for if_state in self.cmp_statements:
tmp = re.split(r"&&|\|\|",if_state[2:].strip()[1:-1])
if_pattern = make_pattern(if_state)
cur_pos = 0
modified = True
while (True):
if_res = re.search(if_pattern, self.content[cur_pos:])
if if_res is None or modified == False:
break
if_start, if_end = if_res.span()
if_start += cur_pos
if_end += cur_pos
for cmp in tmp:
# Cmp funcs
tcnt = 0
break_pos = -1
for j in range(len(cmp)):
if cmp[j] == '(':
tcnt += 1
elif cmp[j] == ')':
tcnt -= 1
if tcnt < 0:
break_pos = j+1
break
if break_pos != -1:
cmp = cmp[:break_pos]
res = re.search(argu_pattern, cmp)
if res is None:
modified = False
continue
lop, operator, rop = res.groups()
# Find the left most operator
lres = re.search(argu_pattern, lop+" ")
while lres is not None:
lop, operator, rop = lres.groups()
lres = re.match(argu_pattern, lop + " ")
pos = cmp.find(operator) + len(operator)
rop = cmp[pos:]
# Don't deal with nested if statements
if check_nested(lop) or check_nested(rop):
modified = False
continue
for symbol in self.noHandleCmpsOperands:
if symbol.lower() == lop.strip().lower():
lop = ''
if symbol.lower() == rop.strip().lower():
rop = ''
if lop == '' or rop == '':
modified = False
continue
res = re.match(r'(0(x|X)[a-zA-Z\d]+)|(\d+)$', lop.strip())
if res is None:
if not check_if_constvar(lop.strip()):
lop = "gs({0})".format(lop)
res = re.search(r'(0(x|X)[a-zA-Z\d]+)|(\d+)|(\'.\')$', rop.strip())
if res is None:
if not check_if_constvar(rop.strip()):
rop = "gs({0})".format(rop)
cmp_pattern = make_pattern(cmp)
#print(cmp_pattern)
t_res = re.search(cmp_pattern, self.content[if_start:if_end])
cmp_start, cmp_end = t_res.span()
cmp_start += if_start
cmp_end += if_start