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6cad1ecd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1 |
9308f2f9 LR |
2 | /* |
3 | * proc sysctl test driver | |
4 | * | |
5 | * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> | |
9308f2f9 LR |
6 | */ |
7 | ||
8 | /* | |
2d046981 | 9 | * This module provides an interface to the proc sysctl interfaces. This |
9308f2f9 LR |
10 | * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the |
11 | * system unless explicitly requested by name. You can also build this driver | |
12 | * into your kernel. | |
13 | */ | |
14 | ||
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
16 | ||
17 | #include <linux/init.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/printk.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/miscdevice.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/async.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/vmalloc.h> | |
28 | ||
29 | static int i_zero; | |
30 | static int i_one_hundred = 100; | |
57b19468 | 31 | static int match_int_ok = 1; |
9308f2f9 | 32 | |
f2e7a626 JG |
33 | |
34 | static struct { | |
35 | struct ctl_table_header *test_h_setup_node; | |
36 | struct ctl_table_header *test_h_mnt; | |
37 | struct ctl_table_header *test_h_mnterror; | |
77774077 JG |
38 | struct ctl_table_header *empty_add; |
39 | struct ctl_table_header *empty; | |
f2e7a626 JG |
40 | } sysctl_test_headers; |
41 | ||
9308f2f9 LR |
42 | struct test_sysctl_data { |
43 | int int_0001; | |
eb965eda | 44 | int int_0002; |
7c43a657 | 45 | int int_0003[4]; |
eb965eda | 46 | |
4f2f682d VB |
47 | int boot_int; |
48 | ||
2920fad3 LR |
49 | unsigned int uint_0001; |
50 | ||
9308f2f9 | 51 | char string_0001[65]; |
2ea622b8 ES |
52 | |
53 | #define SYSCTL_TEST_BITMAP_SIZE 65536 | |
54 | unsigned long *bitmap_0001; | |
9308f2f9 LR |
55 | }; |
56 | ||
57 | static struct test_sysctl_data test_data = { | |
58 | .int_0001 = 60, | |
eb965eda LR |
59 | .int_0002 = 1, |
60 | ||
7c43a657 LR |
61 | .int_0003[0] = 0, |
62 | .int_0003[1] = 1, | |
63 | .int_0003[2] = 2, | |
64 | .int_0003[3] = 3, | |
65 | ||
4f2f682d VB |
66 | .boot_int = 0, |
67 | ||
2920fad3 LR |
68 | .uint_0001 = 314, |
69 | ||
9308f2f9 LR |
70 | .string_0001 = "(none)", |
71 | }; | |
72 | ||
73 | /* These are all under /proc/sys/debug/test_sysctl/ */ | |
74 | static struct ctl_table test_table[] = { | |
75 | { | |
76 | .procname = "int_0001", | |
77 | .data = &test_data.int_0001, | |
78 | .maxlen = sizeof(int), | |
79 | .mode = 0644, | |
80 | .proc_handler = proc_dointvec_minmax, | |
81 | .extra1 = &i_zero, | |
82 | .extra2 = &i_one_hundred, | |
83 | }, | |
eb965eda LR |
84 | { |
85 | .procname = "int_0002", | |
86 | .data = &test_data.int_0002, | |
87 | .maxlen = sizeof(int), | |
88 | .mode = 0644, | |
89 | .proc_handler = proc_dointvec, | |
90 | }, | |
7c43a657 LR |
91 | { |
92 | .procname = "int_0003", | |
93 | .data = &test_data.int_0003, | |
94 | .maxlen = sizeof(test_data.int_0003), | |
95 | .mode = 0644, | |
96 | .proc_handler = proc_dointvec, | |
97 | }, | |
57b19468 TZ |
98 | { |
99 | .procname = "match_int", | |
100 | .data = &match_int_ok, | |
101 | .maxlen = sizeof(match_int_ok), | |
102 | .mode = 0444, | |
103 | .proc_handler = proc_dointvec, | |
104 | }, | |
4f2f682d VB |
105 | { |
106 | .procname = "boot_int", | |
107 | .data = &test_data.boot_int, | |
108 | .maxlen = sizeof(test_data.boot_int), | |
109 | .mode = 0644, | |
110 | .proc_handler = proc_dointvec, | |
111 | .extra1 = SYSCTL_ZERO, | |
112 | .extra2 = SYSCTL_ONE, | |
113 | }, | |
2920fad3 LR |
114 | { |
115 | .procname = "uint_0001", | |
116 | .data = &test_data.uint_0001, | |
117 | .maxlen = sizeof(unsigned int), | |
118 | .mode = 0644, | |
119 | .proc_handler = proc_douintvec, | |
120 | }, | |
9308f2f9 LR |
121 | { |
122 | .procname = "string_0001", | |
123 | .data = &test_data.string_0001, | |
124 | .maxlen = sizeof(test_data.string_0001), | |
125 | .mode = 0644, | |
126 | .proc_handler = proc_dostring, | |
127 | }, | |
2ea622b8 ES |
128 | { |
129 | .procname = "bitmap_0001", | |
130 | .data = &test_data.bitmap_0001, | |
131 | .maxlen = SYSCTL_TEST_BITMAP_SIZE, | |
132 | .mode = 0644, | |
133 | .proc_handler = proc_do_large_bitmap, | |
134 | }, | |
9308f2f9 LR |
135 | }; |
136 | ||
e009bd5e | 137 | static void test_sysctl_calc_match_int_ok(void) |
9308f2f9 | 138 | { |
57b19468 TZ |
139 | int i; |
140 | ||
141 | struct { | |
142 | int defined; | |
143 | int wanted; | |
144 | } match_int[] = { | |
145 | {.defined = *(int *)SYSCTL_ZERO, .wanted = 0}, | |
146 | {.defined = *(int *)SYSCTL_ONE, .wanted = 1}, | |
147 | {.defined = *(int *)SYSCTL_TWO, .wanted = 2}, | |
148 | {.defined = *(int *)SYSCTL_THREE, .wanted = 3}, | |
149 | {.defined = *(int *)SYSCTL_FOUR, .wanted = 4}, | |
150 | {.defined = *(int *)SYSCTL_ONE_HUNDRED, .wanted = 100}, | |
151 | {.defined = *(int *)SYSCTL_TWO_HUNDRED, .wanted = 200}, | |
152 | {.defined = *(int *)SYSCTL_ONE_THOUSAND, .wanted = 1000}, | |
153 | {.defined = *(int *)SYSCTL_THREE_THOUSAND, .wanted = 3000}, | |
154 | {.defined = *(int *)SYSCTL_INT_MAX, .wanted = INT_MAX}, | |
155 | {.defined = *(int *)SYSCTL_MAXOLDUID, .wanted = 65535}, | |
156 | {.defined = *(int *)SYSCTL_NEG_ONE, .wanted = -1}, | |
157 | }; | |
158 | ||
159 | for (i = 0; i < ARRAY_SIZE(match_int); i++) | |
160 | if (match_int[i].defined != match_int[i].wanted) | |
161 | match_int_ok = 0; | |
e009bd5e | 162 | } |
57b19468 | 163 | |
e009bd5e JG |
164 | static int test_sysctl_setup_node_tests(void) |
165 | { | |
166 | test_sysctl_calc_match_int_ok(); | |
2ea622b8 ES |
167 | test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL); |
168 | if (!test_data.bitmap_0001) | |
169 | return -ENOMEM; | |
f2e7a626 JG |
170 | sysctl_test_headers.test_h_setup_node = register_sysctl("debug/test_sysctl", test_table); |
171 | if (!sysctl_test_headers.test_h_setup_node) { | |
2ea622b8 | 172 | kfree(test_data.bitmap_0001); |
9308f2f9 | 173 | return -ENOMEM; |
2ea622b8 | 174 | } |
e009bd5e | 175 | |
9308f2f9 LR |
176 | return 0; |
177 | } | |
e009bd5e | 178 | |
35576438 JG |
179 | /* Used to test that unregister actually removes the directory */ |
180 | static struct ctl_table test_table_unregister[] = { | |
181 | { | |
182 | .procname = "unregister_error", | |
183 | .data = &test_data.int_0001, | |
184 | .maxlen = sizeof(int), | |
185 | .mode = 0644, | |
186 | .proc_handler = proc_dointvec_minmax, | |
187 | }, | |
35576438 JG |
188 | }; |
189 | ||
190 | static int test_sysctl_run_unregister_nested(void) | |
191 | { | |
192 | struct ctl_table_header *unregister; | |
193 | ||
194 | unregister = register_sysctl("debug/test_sysctl/unregister_error", | |
195 | test_table_unregister); | |
196 | if (!unregister) | |
197 | return -ENOMEM; | |
198 | ||
199 | unregister_sysctl_table(unregister); | |
200 | return 0; | |
201 | } | |
202 | ||
f2e7a626 JG |
203 | static int test_sysctl_run_register_mount_point(void) |
204 | { | |
205 | sysctl_test_headers.test_h_mnt | |
206 | = register_sysctl_mount_point("debug/test_sysctl/mnt"); | |
207 | if (!sysctl_test_headers.test_h_mnt) | |
208 | return -ENOMEM; | |
209 | ||
210 | sysctl_test_headers.test_h_mnterror | |
211 | = register_sysctl("debug/test_sysctl/mnt/mnt_error", | |
212 | test_table_unregister); | |
213 | /* | |
214 | * Don't check the result.: | |
215 | * If it fails (expected behavior), return 0. | |
216 | * If successful (missbehavior of register mount point), we want to see | |
217 | * mnt_error when we run the sysctl test script | |
218 | */ | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
77774077 JG |
223 | static struct ctl_table test_table_empty[] = { }; |
224 | ||
225 | static int test_sysctl_run_register_empty(void) | |
226 | { | |
227 | /* Tets that an empty dir can be created */ | |
228 | sysctl_test_headers.empty_add | |
229 | = register_sysctl("debug/test_sysctl/empty_add", test_table_empty); | |
230 | if (!sysctl_test_headers.empty_add) | |
231 | return -ENOMEM; | |
232 | ||
233 | /* Test that register on top of an empty dir works */ | |
234 | sysctl_test_headers.empty | |
235 | = register_sysctl("debug/test_sysctl/empty_add/empty", test_table_empty); | |
236 | if (!sysctl_test_headers.empty) | |
237 | return -ENOMEM; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
e009bd5e JG |
242 | static int __init test_sysctl_init(void) |
243 | { | |
244 | int err; | |
245 | ||
246 | err = test_sysctl_setup_node_tests(); | |
35576438 JG |
247 | if (err) |
248 | goto out; | |
249 | ||
250 | err = test_sysctl_run_unregister_nested(); | |
f2e7a626 JG |
251 | if (err) |
252 | goto out; | |
253 | ||
254 | err = test_sysctl_run_register_mount_point(); | |
77774077 JG |
255 | if (err) |
256 | goto out; | |
257 | ||
258 | err = test_sysctl_run_register_empty(); | |
e009bd5e | 259 | |
35576438 | 260 | out: |
e009bd5e JG |
261 | return err; |
262 | } | |
2f56f845 | 263 | module_init(test_sysctl_init); |
9308f2f9 LR |
264 | |
265 | static void __exit test_sysctl_exit(void) | |
266 | { | |
2ea622b8 | 267 | kfree(test_data.bitmap_0001); |
f2e7a626 JG |
268 | if (sysctl_test_headers.test_h_setup_node) |
269 | unregister_sysctl_table(sysctl_test_headers.test_h_setup_node); | |
270 | if (sysctl_test_headers.test_h_mnt) | |
271 | unregister_sysctl_table(sysctl_test_headers.test_h_mnt); | |
272 | if (sysctl_test_headers.test_h_mnterror) | |
273 | unregister_sysctl_table(sysctl_test_headers.test_h_mnterror); | |
77774077 JG |
274 | if (sysctl_test_headers.empty) |
275 | unregister_sysctl_table(sysctl_test_headers.empty); | |
276 | if (sysctl_test_headers.empty_add) | |
277 | unregister_sysctl_table(sysctl_test_headers.empty_add); | |
9308f2f9 LR |
278 | } |
279 | ||
280 | module_exit(test_sysctl_exit); | |
281 | ||
282 | MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); | |
283 | MODULE_LICENSE("GPL"); |