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
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
# Copyright 2024 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: GPL-3
import asyncio
import errno
import os
import pathlib
import socket
import unittest
import pytest
import linuxnamespaces
class MountFlagsTest(unittest.TestCase):
def test_tostrfromstr(self) -> None:
for bit1 in range(32):
for bit2 in range(bit1, 32):
flag = (
linuxnamespaces.MountFlags(1 << bit1)
| linuxnamespaces.MountFlags(1 << bit2)
)
try:
text = flag.tostr()
except ValueError:
continue
self.assertEqual(
linuxnamespaces.MountFlags.fromstr(text), flag
)
class IDAllocationTest(unittest.TestCase):
def test_idalloc(self) -> None:
alloc = linuxnamespaces.IDAllocation()
alloc.add_range(1, 2)
alloc.add_range(5, 4)
self.assertIn(alloc.find(3), (5, 6))
self.assertIn(alloc.allocate(3), (5, 6))
self.assertRaises(ValueError, alloc.find, 3)
self.assertRaises(ValueError, alloc.allocate, 3)
self.assertEqual(alloc.find(2), 1)
def test_merge(self) -> None:
alloc = linuxnamespaces.IDAllocation()
alloc.add_range(1, 2)
alloc.add_range(3, 2)
self.assertIn(alloc.allocate(3), (1, 2))
def test_reserve(self) -> None:
alloc = linuxnamespaces.IDAllocation()
alloc.add_range(0, 10)
# Split a range
alloc.reserve(3, 3)
self.assertEqual(alloc.ranges, [(0, 3), (6, 4)])
self.assertRaises(ValueError, alloc.reserve, 0, 4)
self.assertRaises(ValueError, alloc.reserve, 5, 4)
# Head of range
alloc.reserve(0, 2)
self.assertEqual(alloc.ranges, [(2, 1), (6, 4)])
# Tail of range
alloc.reserve(7, 3)
self.assertEqual(alloc.ranges, [(2, 1), (6, 1)])
# Exact range
alloc.reserve(6, 1)
self.assertEqual(alloc.ranges, [(2, 1)])
class AsnycioTest(unittest.IsolatedAsyncioTestCase):
async def asyncSetUp(self) -> None:
self.loop = asyncio.get_running_loop()
def wait_readable(self, rfd: int) -> asyncio.Future[None]:
fut = self.loop.create_future()
def callback() -> None:
self.loop.remove_reader(rfd)
fut.set_result(None)
self.loop.add_reader(rfd, callback)
return fut
async def test_eventfd(self) -> None:
with linuxnamespaces.EventFD(
1, linuxnamespaces.EventFDFlags.NONBLOCK
) as efd:
fut = asyncio.ensure_future(efd.aread())
await asyncio.sleep(0.000001) # Let the loop run
self.assertTrue(fut.done())
self.assertEqual(await fut, 1)
fut = asyncio.ensure_future(efd.aread())
await asyncio.sleep(0.000001) # Let the loop run
self.assertFalse(fut.done())
efd.write()
self.assertEqual(await fut, 1)
async def test_run_in_fork(self) -> None:
with linuxnamespaces.EventFD(
0, linuxnamespaces.EventFDFlags.NONBLOCK
) as efd:
fut = asyncio.ensure_future(efd.aread())
set_ready = linuxnamespaces.async_run_in_fork(efd.write)
await asyncio.sleep(0.000001) # Let the loop run
self.assertFalse(fut.done())
await set_ready()
await asyncio.wait_for(fut, 10)
async def test_copyfd_file_sock(self) -> None:
sock1, sock2 = socket.socketpair()
with sock1, sock2, linuxnamespaces.FileDescriptor(
os.open("/etc/passwd", os.O_RDONLY)
) as rfd:
fut = asyncio.ensure_future(
linuxnamespaces.async_copyfd(rfd, sock1.fileno(), 999)
)
await self.wait_readable(sock2.fileno())
self.assertGreater(len(sock2.recv(999)), 0)
self.assertTrue(fut.done())
self.assertGreater(await fut, 0)
async def test_copyfd_file_pipe(self) -> None:
rfdp, wfdp = linuxnamespaces.FileDescriptor.pipe(blocking=False)
with rfdp, wfdp, linuxnamespaces.FileDescriptor(
os.open("/etc/passwd", os.O_RDONLY)
) as rfd:
fut = asyncio.ensure_future(
linuxnamespaces.async_copyfd(rfd, wfdp, 999)
)
await self.wait_readable(rfdp)
self.assertGreater(len(os.read(rfdp, 999)), 0)
self.assertTrue(fut.done())
self.assertGreater(await fut, 0)
async def test_copyfd_pipe_pipe(self) -> None:
rfd1, wfd1 = linuxnamespaces.FileDescriptor.pipe(blocking=False)
rfd2, wfd2 = linuxnamespaces.FileDescriptor.pipe(blocking=False)
with wfd2, rfd2, rfd1:
with wfd1:
fut = asyncio.ensure_future(
linuxnamespaces.async_copyfd(rfd1, wfd2)
)
os.write(wfd1, b"hello")
await asyncio.sleep(0.000001) # Let the loop run
os.write(wfd1, b"world")
await self.wait_readable(rfd2)
self.assertEqual(os.read(rfd2, 11), b"helloworld")
self.assertFalse(fut.done())
await asyncio.sleep(0.000001) # Let the loop run
self.assertTrue(fut.done())
self.assertEqual(await fut, 10)
async def test_copyfd_epipe(self) -> None:
rfd1, wfd1 = linuxnamespaces.FileDescriptor.pipe(blocking=False)
rfd2, wfd2 = linuxnamespaces.FileDescriptor.pipe(blocking=False)
with wfd2, wfd1, rfd1:
with rfd2:
fut = asyncio.ensure_future(
linuxnamespaces.async_copyfd(rfd1, wfd2)
)
os.write(wfd1, b"hello")
await asyncio.sleep(0.000001) # Let the loop run
self.assertTrue(fut.done())
exc = fut.exception()
self.assertIsInstance(exc, OSError)
assert isinstance(exc, OSError) # also tell mypy
self.assertEqual(exc.errno, errno.EPIPE)
class UnshareTest(unittest.TestCase):
@pytest.mark.forked
def test_unshare_user(self) -> None:
overflowuid = int(pathlib.Path("/proc/sys/fs/overflowuid").read_text())
idmap = linuxnamespaces.IDMapping(0, os.getuid(), 1)
linuxnamespaces.unshare(linuxnamespaces.CloneFlags.NEWUSER)
self.assertEqual(os.getuid(), overflowuid)
linuxnamespaces.newuidmap(-1, [idmap], False)
self.assertEqual(os.getuid(), 0)
# UID 1 is not mapped.
self.assertRaises(OSError, os.setuid, 1)
@pytest.mark.forked
def test_mount_proc(self) -> None:
idmap = linuxnamespaces.IDMapping(0, os.getuid(), 1)
linuxnamespaces.unshare(
linuxnamespaces.CloneFlags.NEWUSER
| linuxnamespaces.CloneFlags.NEWNS
| linuxnamespaces.CloneFlags.NEWPID
)
linuxnamespaces.newuidmap(-1, [idmap], False)
@linuxnamespaces.run_in_fork
def setup() -> None:
self.assertEqual(os.getpid(), 1)
linuxnamespaces.mount("proc", "/proc", "proc")
setup()
@pytest.mark.forked
def test_sethostname(self) -> None:
self.assertRaises(socket.error, socket.sethostname, "example")
linuxnamespaces.unshare(
linuxnamespaces.CloneFlags.NEWUSER
| linuxnamespaces.CloneFlags.NEWUTS
)
socket.sethostname("example")
@pytest.mark.forked
def test_populate_dev(self) -> None:
linuxnamespaces.unshare_user_idmap_nohelper(
0,
0,
linuxnamespaces.CloneFlags.NEWUSER
| linuxnamespaces.CloneFlags.NEWNS,
)
linuxnamespaces.mount("tmpfs", "/mnt", "tmpfs", data="mode=0755")
os.mkdir("/mnt/dev")
linuxnamespaces.populate_dev("/", "/mnt", pidns=False)
self.assertTrue(os.access("/mnt/dev/null", os.W_OK))
pathlib.Path("/mnt/dev/null").write_text("")
class UnshareIdmapTest(unittest.TestCase):
def setUp(self) -> None:
super().setUp()
self.uidalloc = linuxnamespaces.IDAllocation.loadsubid("uid")
self.gidalloc = linuxnamespaces.IDAllocation.loadsubid("gid")
try:
self.uidalloc.find(65536)
self.gidalloc.find(65536)
except ValueError:
self.skipTest("insufficient /etc/sub?id allocation")
@pytest.mark.forked
def test_unshare_user_idmap(self) -> None:
uidmaps = [
linuxnamespaces.IDMapping(0, self.uidalloc.allocate(65536), 65536),
linuxnamespaces.IDMapping(65536, os.getuid(), 1),
]
self.assertNotEqual(os.getuid(), uidmaps[0].outerstart)
gidmaps = [
linuxnamespaces.IDMapping(0, self.gidalloc.allocate(65536), 65536),
linuxnamespaces.IDMapping(65536, os.getgid(), 1),
]
pid = os.getpid()
@linuxnamespaces.run_in_fork
def setup() -> None:
linuxnamespaces.newidmaps(pid, uidmaps, gidmaps)
linuxnamespaces.unshare(linuxnamespaces.CloneFlags.NEWUSER)
setup()
self.assertEqual(os.getuid(), 65536)
os.setuid(0)
self.assertEqual(os.getuid(), 0)
# Keep root in saved-set for later setuid
os.setresuid(1, 1, 0)
self.assertEqual(os.getuid(), 1)
# Regain root and a full set of capabilities to save test coverage
os.setuid(0)
@pytest.mark.forked
def test_populate_dev(self) -> None:
uidmaps = [
linuxnamespaces.IDMapping(0, self.uidalloc.allocate(65536), 65536),
# Also map our own uid to make coverage testing work
linuxnamespaces.IDMapping(65536, os.getuid(), 1),
]
self.assertNotEqual(os.getuid(), uidmaps[0].outerstart)
gidmaps = [
linuxnamespaces.IDMapping(0, self.gidalloc.allocate(65536), 65536),
linuxnamespaces.IDMapping(65536, os.getgid(), 1),
]
pid = os.getpid()
@linuxnamespaces.run_in_fork
def setup() -> None:
linuxnamespaces.newidmaps(pid, uidmaps, gidmaps)
linuxnamespaces.unshare(
linuxnamespaces.CloneFlags.NEWUSER
| linuxnamespaces.CloneFlags.NEWNS
| linuxnamespaces.CloneFlags.NEWPID
)
setup()
os.setreuid(0, 0)
os.setregid(0, 0)
linuxnamespaces.mount("tmpfs", "/mnt", "tmpfs")
os.mkdir("/mnt/dev")
@linuxnamespaces.run_in_fork
def test() -> None:
linuxnamespaces.populate_dev("/", "/mnt")
test()
|
