1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#! /bin/python3
import os
import re
import sys
import lldb
import shutil
import argparse
from utils import print_separator
verbose = False
regnames = ['PC',
'RAX',
'RBX',
'RCX',
'RDX',
'RSI',
'RDI',
'RBP',
'RSP',
'R8',
'R9',
'R10',
'R11',
'R12',
'R13',
'R14',
'R15',
'RFLAGS']
class DebuggerCallback:
def __init__(self, ostream=sys.stdout, skiplist: set = {}):
self.stream = ostream
self.regex = re.compile('(' + '|'.join(regnames) + ')$')
self.skiplist = skiplist
@staticmethod
def parse_flags(flag_reg: int):
flags = {'ZF': 0,
'CF': 0,
'OF': 0,
'SF': 0,
'PF': 0,
'DF': 0}
# CF (Carry flag) Bit 0
# PF (Parity flag) Bit 2
# ZF (Zero flag) Bit 6
# SF (Sign flag) Bit 7
# TF (Trap flag) Bit 8
# IF (Interrupt enable flag) Bit 9
# DF (Direction flag) Bit 10
# OF (Overflow flag) Bit 11
flags['CF'] = int(0 != flag_reg & 1)
flags['ZF'] = int(0 != flag_reg & (1 << 6))
flags['OF'] = int(0 != flag_reg & (1 << 11))
flags['SF'] = int(0 != flag_reg & (1 << 7))
flags['DF'] = int(0 != flag_reg & (1 << 10))
flags['PF'] = int(0 != flag_reg & (1 << 1))
return flags
def print_regs(self, frame):
for reg in frame.GetRegisters():
for sub_reg in reg:
match = self.regex.match(sub_reg.GetName().upper())
if match and match.group() == 'RFLAGS':
flags = DebuggerCallback.parse_flags(int(sub_reg.GetValue(),
base=16))
for flag in flags:
print(f'flag {flag}:\t{hex(flags[flag])}',
file=self.stream)
elif match:
print(f"{sub_reg.GetName().upper()}:\t\t {hex(int(sub_reg.GetValue(), base=16))}",
file=self.stream)
def print_stack(self, frame, element_count: int):
first = True
for i in range(element_count):
addr = frame.GetSP() + i * frame.GetThread().GetProcess().GetAddressByteSize()
error = lldb.SBError()
stack_value = int(frame.GetThread().GetProcess().ReadPointerFromMemory(addr, error))
if error.Success() and not first:
print(f'{hex(stack_value)}', file=self.stream)
elif error.Success():
print(f'{hex(stack_value)}\t\t<- rsp', file=self.stream)
else:
print(f"Error reading memory at address 0x{addr:x}",
file=self.stream)
first=False
def __call__(self, frame):
pc = frame.GetPC()
# Skip this PC
if pc in self.skiplist:
self.skiplist.discard(pc)
return False
print_separator('=', stream=self.stream, count=20)
print(f'INVOKE PC={hex(pc)}', file=self.stream)
print_separator('=', stream=self.stream, count=20)
print("Register values:", file=self.stream)
self.print_regs(frame)
print_separator(stream=self.stream)
print("STACK:", file=self.stream)
self.print_stack(frame, 20)
return True # Continue execution
class Debugger:
def __init__(self, program):
self.debugger = lldb.SBDebugger.Create()
self.debugger.SetAsync(False)
self.target = self.debugger.CreateTargetWithFileAndArch(program,
lldb.LLDB_ARCH_DEFAULT)
self.module = self.target.FindModule(self.target.GetExecutable())
self.interpreter = self.debugger.GetCommandInterpreter()
def set_breakpoint_by_addr(self, address: int):
command = f"b -a {address} -s {self.module.GetFileSpec().GetFilename()}"
result = lldb.SBCommandReturnObject()
self.interpreter.HandleCommand(command, result)
if verbose:
print(f'Set breakpoint at address {hex(address)}')
def get_breakpoints_count(self):
return self.target.GetNumBreakpoints()
def execute(self, callback: callable):
error = lldb.SBError()
listener = self.debugger.GetListener()
process = self.target.Launch(listener, None, None, None, None, None, None, 0,
True, error)
# Check if the process has launched successfully
if process.IsValid():
print(f'Launched process: {process}')
else:
print('Failed to launch process', file=sys.stderr)
while True:
state = process.GetState()
if state == lldb.eStateStopped:
for thread in process:
callback(thread.GetFrameAtIndex(0))
process.Continue()
if state == lldb.eStateExited:
break
self.debugger.Terminate()
print(f'Process state: {process.GetState()}')
print('Program output:')
print(process.GetSTDOUT(1024))
print(process.GetSTDERR(1024))
class ListWriter:
def __init__(self):
self.data = []
def write(self, s):
self.data.append(s)
def __str__(self):
return "".join(self.data)
class Runner:
def __init__(self, dbt_log: list, oracle_program: str):
self.log = dbt_log
self.program = oracle_program
self.debugger = Debugger(self.program)
self.writer = ListWriter()
@staticmethod
def get_addresses(lines: list):
addresses = []
backlist = []
backlist_regex = re.compile(r'^\s\s\d*:')
skiplist = set()
for l in lines:
if l.startswith('INVOKE'):
addresses.append(int(l.split('=')[1].strip(), base=16))
if addresses[-1] in backlist:
skiplist.add(addresses[-1])
backlist = []
if backlist_regex.match(l):
backlist.append(int(l.split()[0].split(':')[0], base=16))
return set(addresses), skiplist
def run(self):
# Get all addresses to stop at
addresses, skiplist = Runner.get_addresses(self.log)
# Set breakpoints
for address in addresses:
self.debugger.set_breakpoint_by_addr(address)
# Sanity check
assert(self.debugger.get_breakpoints_count() == len(addresses))
self.debugger.execute(DebuggerCallback(self.writer, skiplist))
return self.writer.data
|