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
|
#!/usr/bin/env python
# coding: utf-8
import io
import msgpack
binarydata = bytes(bytearray(range(256)))
def gen_binary_data(idx):
return binarydata[:idx % 300]
def test_exceeding_unpacker_read_size():
dumpf = io.BytesIO()
packer = msgpack.Packer()
NUMBER_OF_STRINGS = 6
read_size = 16
# 5 ok for read_size=16, while 6 glibc detected *** python: double free or corruption (fasttop):
# 20 ok for read_size=256, while 25 segfaults / glibc detected *** python: double free or corruption (!prev)
# 40 ok for read_size=1024, while 50 introduces errors
# 7000 ok for read_size=1024*1024, while 8000 leads to glibc detected *** python: double free or corruption (!prev):
for idx in range(NUMBER_OF_STRINGS):
data = gen_binary_data(idx)
dumpf.write(packer.pack(data))
f = io.BytesIO(dumpf.getvalue())
dumpf.close()
unpacker = msgpack.Unpacker(f, read_size=read_size, use_list=1)
read_count = 0
for idx, o in enumerate(unpacker):
assert type(o) == bytes
assert o == gen_binary_data(idx)
read_count += 1
assert read_count == NUMBER_OF_STRINGS
|
