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
|
from __future__ import print_function
from argparse import ArgumentParser
from future.utils import viewitems, viewvalues
from miasm.analysis.binary import Container
from miasm.analysis.machine import Machine
from miasm.expression.expression import get_expr_mem
from miasm.analysis.data_analysis import intra_block_flow_raw, inter_block_flow
from miasm.core.graph import DiGraph
from miasm.ir.symbexec import SymbolicExecutionEngine
from miasm.analysis.data_flow import DeadRemoval
from miasm.core.locationdb import LocationDB
parser = ArgumentParser(description="Simple expression use for generating dataflow graph")
parser.add_argument("filename", help="File to analyse")
parser.add_argument("addr", help="Function's address")
parser.add_argument("-s", "--symb", help="Symbolic execution mode",
action="store_true")
args = parser.parse_args()
def get_node_name(label, i, n):
n_name = (label, i, n)
return n_name
def intra_block_flow_symb(lifter, _, flow_graph, irblock, in_nodes, out_nodes):
symbols_init = lifter.arch.regs.regs_init.copy()
sb = SymbolicExecutionEngine(lifter, symbols_init)
sb.eval_updt_irblock(irblock)
print('*' * 40)
print(irblock)
out = sb.modified(mems=False)
current_nodes = {}
# Gen mem arg to mem node links
for dst, src in out:
src = sb.eval_expr(dst)
for n in [dst, src]:
all_mems = set()
all_mems.update(get_expr_mem(n))
for n in all_mems:
node_n_w = get_node_name(irblock.loc_key, 0, n)
if not n == src:
continue
o_r = n.ptr.get_r(mem_read=False, cst_read=True)
for i, n_r in enumerate(o_r):
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = get_node_name(irblock.loc_key, i, n_r)
if not n_r in in_nodes:
in_nodes[n_r] = node_n_r
flow_graph.add_uniq_edge(node_n_r, node_n_w)
# Gen data flow links
for dst in out:
src = sb.eval_expr(dst)
nodes_r = src.get_r(mem_read=False, cst_read=True)
nodes_w = set([dst])
for n_r in nodes_r:
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = get_node_name(irblock.loc_key, 0, n_r)
if not n_r in in_nodes:
in_nodes[n_r] = node_n_r
flow_graph.add_node(node_n_r)
for n_w in nodes_w:
node_n_w = get_node_name(irblock.loc_key, 1, n_w)
out_nodes[n_w] = node_n_w
flow_graph.add_node(node_n_w)
flow_graph.add_uniq_edge(node_n_r, node_n_w)
def node2str(node):
out = "%s,%s\\l\\\n%s" % node
return out
def gen_block_data_flow_graph(lifter, ircfg, ad, block_flow_cb):
for irblock in viewvalues(ircfg.blocks):
print(irblock)
deadrm(ircfg)
irblock_0 = None
for irblock in viewvalues(ircfg.blocks):
loc_key = irblock.loc_key
offset = ircfg.loc_db.get_location_offset(loc_key)
if offset == ad:
irblock_0 = irblock
break
assert irblock_0 is not None
flow_graph = DiGraph()
flow_graph.node2str = node2str
irb_in_nodes = {}
irb_out_nodes = {}
for label in ircfg.blocks:
irb_in_nodes[label] = {}
irb_out_nodes[label] = {}
for label, irblock in viewitems(ircfg.blocks):
block_flow_cb(lifter, ircfg, flow_graph, irblock, irb_in_nodes[label], irb_out_nodes[label])
for label in ircfg.blocks:
print(label)
print('IN', [str(x) for x in irb_in_nodes[label]])
print('OUT', [str(x) for x in irb_out_nodes[label]])
print('*' * 20, 'interblock', '*' * 20)
inter_block_flow(lifter, ircfg, flow_graph, irblock_0.loc_key, irb_in_nodes, irb_out_nodes)
# from graph_qt import graph_qt
# graph_qt(flow_graph)
open('data.dot', 'w').write(flow_graph.dot())
ad = int(args.addr, 16)
loc_db = LocationDB()
print('disasm...')
cont = Container.from_stream(open(args.filename, 'rb'), loc_db)
machine = Machine("x86_32")
mdis = machine.dis_engine(cont.bin_stream, loc_db=loc_db)
mdis.follow_call = True
asmcfg = mdis.dis_multiblock(ad)
print('ok')
print('generating dataflow graph for:')
lifter = machine.lifter_model_call(loc_db)
ircfg = lifter.new_ircfg_from_asmcfg(asmcfg)
deadrm = DeadRemoval(lifter)
for irblock in viewvalues(ircfg.blocks):
print(irblock)
if args.symb:
block_flow_cb = intra_block_flow_symb
else:
block_flow_cb = intra_block_flow_raw
gen_block_data_flow_graph(lifter, ircfg, ad, block_flow_cb)
print('*' * 40)
print("""
View with:
dotty dataflow.dot
or
Generate ps with pdf:
dot -Tps dataflow_xx.dot -o graph.ps
""")
|