File: devicefilter_test.go

package info (click to toggle)
golang-github-containerd-cgroups 0.0~git20201119.4cbc285-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 776 kB
  • sloc: makefile: 17
file content (185 lines) | stat: -rw-r--r-- 4,833 bytes parent folder | download | duplicates (3)
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
/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package v2

import (
	"strings"
	"testing"

	"github.com/opencontainers/runtime-spec/specs-go"
)

func hash(s, comm string) string {
	var res []string
	for _, l := range strings.Split(s, "\n") {
		trimmed := strings.TrimSpace(l)
		if trimmed == "" || strings.HasPrefix(trimmed, comm) {
			continue
		}
		res = append(res, trimmed)
	}
	return strings.Join(res, "\n")
}

func testDeviceFilter(t testing.TB, devices []specs.LinuxDeviceCgroup, expectedStr string) {
	insts, _, err := DeviceFilter(devices)
	if err != nil {
		t.Fatalf("%s: %v (devices: %+v)", t.Name(), err, devices)
	}
	s := insts.String()
	t.Logf("%s: devices: %+v\n%s", t.Name(), devices, s)
	if expectedStr != "" {
		hashed := hash(s, "//")
		expectedHashed := hash(expectedStr, "//")
		if expectedHashed != hashed {
			t.Fatalf("expected:\n%q\ngot\n%q", expectedHashed, hashed)
		}
	}
}

func TestDeviceFilter_Nil(t *testing.T) {
	expected := `
// load parameters into registers
        0: LdXMemH dst: r2 src: r1 off: 0 imm: 0
        1: LdXMemW dst: r3 src: r1 off: 0 imm: 0
        2: RSh32Imm dst: r3 imm: 16
        3: LdXMemW dst: r4 src: r1 off: 4 imm: 0
        4: LdXMemW dst: r5 src: r1 off: 8 imm: 0
block-0:
// return 0 (reject)
        5: Mov32Imm dst: r0 imm: 0
        6: Exit
	`
	testDeviceFilter(t, nil, expected)
}

func TestDeviceFilter_Privileged(t *testing.T) {
	devices := []specs.LinuxDeviceCgroup{
		{
			Type:   "a",
			Major:  pointerInt64(-1),
			Minor:  pointerInt64(-1),
			Access: "rwm",
			Allow:  true,
		},
	}
	expected :=
		`
// load parameters into registers
        0: LdXMemH dst: r2 src: r1 off: 0 imm: 0
        1: LdXMemW dst: r3 src: r1 off: 0 imm: 0
        2: RSh32Imm dst: r3 imm: 16
        3: LdXMemW dst: r4 src: r1 off: 4 imm: 0
        4: LdXMemW dst: r5 src: r1 off: 8 imm: 0
block-0:
// return 1 (accept)
        5: Mov32Imm dst: r0 imm: 1
        6: Exit
	`
	testDeviceFilter(t, devices, expected)
}

func TestDeviceFilter_PrivilegedExceptSingleDevice(t *testing.T) {
	devices := []specs.LinuxDeviceCgroup{
		{
			Type:   "a",
			Major:  pointerInt64(-1),
			Minor:  pointerInt64(-1),
			Access: "rwm",
			Allow:  true,
		},
		{
			Type:   "b",
			Major:  pointerInt64(8),
			Minor:  pointerInt64(0),
			Access: "rwm",
			Allow:  false,
		},
	}
	expected := `
// load parameters into registers
         0: LdXMemH dst: r2 src: r1 off: 0 imm: 0
         1: LdXMemW dst: r3 src: r1 off: 0 imm: 0
         2: RSh32Imm dst: r3 imm: 16
         3: LdXMemW dst: r4 src: r1 off: 4 imm: 0
         4: LdXMemW dst: r5 src: r1 off: 8 imm: 0
block-0:
// return 0 (reject) if type==b && major == 8 && minor == 0
         5: JNEImm dst: r2 off: -1 imm: 1 <block-1>
         6: JNEImm dst: r4 off: -1 imm: 8 <block-1>
         7: JNEImm dst: r5 off: -1 imm: 0 <block-1>
         8: Mov32Imm dst: r0 imm: 0
         9: Exit
block-1:
// return 1 (accept)
        10: Mov32Imm dst: r0 imm: 1
        11: Exit
`
	testDeviceFilter(t, devices, expected)
}

func TestDeviceFilter_Weird(t *testing.T) {
	devices := []specs.LinuxDeviceCgroup{
		{
			Type:   "b",
			Major:  pointerInt64(8),
			Minor:  pointerInt64(1),
			Access: "rwm",
			Allow:  false,
		},
		{
			Type:   "a",
			Major:  pointerInt64(-1),
			Minor:  pointerInt64(-1),
			Access: "rwm",
			Allow:  true,
		},
		{
			Type:   "b",
			Major:  pointerInt64(8),
			Minor:  pointerInt64(2),
			Access: "rwm",
			Allow:  false,
		},
	}
	// 8/1 is allowed, 8/2 is not allowed.
	// This conforms to runc v1.0.0-rc.9 (cgroup1) behavior.
	expected := `
// load parameters into registers
         0: LdXMemH dst: r2 src: r1 off: 0 imm: 0
         1: LdXMemW dst: r3 src: r1 off: 0 imm: 0
         2: RSh32Imm dst: r3 imm: 16
         3: LdXMemW dst: r4 src: r1 off: 4 imm: 0
         4: LdXMemW dst: r5 src: r1 off: 8 imm: 0
block-0:
// return 0 (reject) if type==b && major == 8 && minor == 2
         5: JNEImm dst: r2 off: -1 imm: 1 <block-1>
         6: JNEImm dst: r4 off: -1 imm: 8 <block-1>
         7: JNEImm dst: r5 off: -1 imm: 2 <block-1>
         8: Mov32Imm dst: r0 imm: 0
         9: Exit
block-1:
// return 1 (accept)
        10: Mov32Imm dst: r0 imm: 1
        11: Exit
`
	testDeviceFilter(t, devices, expected)
}

func pointerInt64(int int64) *int64 {
	return &int
}