1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * KUnit test of proc sysctl.
4 */
5
6 #include <kunit/test.h>
7 #include <linux/sysctl.h>
8
9 #define KUNIT_PROC_READ 0
10 #define KUNIT_PROC_WRITE 1
11
12 /*
13 * Test that proc_dointvec will not try to use
14 * length is non-zero.
15 */
16 static void sysctl_test_api_dointvec_null_tbl_
17 {
18 struct ctl_table null_data_table = {
19 .procname = "foo",
20 /*
21 * Here we are testing that pr
22 * we give it a NULL .data fie
23 * piece of memory where the v
24 */
25 .data = NULL,
26 .maxlen = sizeof(int),
27 .mode = 0644,
28 .proc_handler = proc_dointve
29 .extra1 = SYSCTL_ZERO,
30 .extra2 = SYSCTL_ONE_H
31 };
32 /*
33 * proc_dointvec expects a buffer in u
34 * also need to cast it to __user so s
35 */
36 void __user *buffer = (void __user *)k
37
38 size_t len;
39 loff_t pos;
40
41 /*
42 * We don't care what the starting len
43 * not try to read because .data is NU
44 */
45 len = 1234;
46 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
47
48
49 KUNIT_EXPECT_EQ(test, 0, len);
50
51 /*
52 * See above.
53 */
54 len = 1234;
55 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
56
57
58 KUNIT_EXPECT_EQ(test, 0, len);
59 }
60
61 /*
62 * Similar to the previous test, we create a s
63 * field that proc_dointvec cannot do anything
64 * because we tell proc_dointvec that the size
65 */
66 static void sysctl_test_api_dointvec_table_max
67 {
68 int data = 0;
69 struct ctl_table data_maxlen_unset_tab
70 .procname = "foo",
71 .data = &data,
72 /*
73 * So .data is no longer NULL,
74 * length is 0, so it still sh
75 */
76 .maxlen = 0,
77 .mode = 0644,
78 .proc_handler = proc_dointve
79 .extra1 = SYSCTL_ZERO,
80 .extra2 = SYSCTL_ONE_H
81 };
82 void __user *buffer = (void __user *)k
83
84 size_t len;
85 loff_t pos;
86
87 /*
88 * As before, we don't care what buffe
89 * cannot do anything because its inte
90 */
91 len = 1234;
92 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
93
94
95 KUNIT_EXPECT_EQ(test, 0, len);
96
97 /*
98 * See previous comment.
99 */
100 len = 1234;
101 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
102
103
104 KUNIT_EXPECT_EQ(test, 0, len);
105 }
106
107 /*
108 * Here we provide a valid struct ctl_table, b
109 * it using a buffer of zero length, so it sho
110 * before.
111 */
112 static void sysctl_test_api_dointvec_table_len
113 {
114 int data = 0;
115 /* Good table. */
116 struct ctl_table table = {
117 .procname = "foo",
118 .data = &data,
119 .maxlen = sizeof(int),
120 .mode = 0644,
121 .proc_handler = proc_dointve
122 .extra1 = SYSCTL_ZERO,
123 .extra2 = SYSCTL_ONE_H
124 };
125 void __user *buffer = (void __user *)k
126
127 /*
128 * However, now our read/write buffer
129 */
130 size_t len = 0;
131 loff_t pos;
132
133 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
134
135 KUNIT_EXPECT_EQ(test, 0, len);
136
137 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
138
139 KUNIT_EXPECT_EQ(test, 0, len);
140 }
141
142 /*
143 * Test that proc_dointvec refuses to read whe
144 */
145 static void sysctl_test_api_dointvec_table_rea
146 struct kunit *test)
147 {
148 int data = 0;
149 /* Good table. */
150 struct ctl_table table = {
151 .procname = "foo",
152 .data = &data,
153 .maxlen = sizeof(int),
154 .mode = 0644,
155 .proc_handler = proc_dointve
156 .extra1 = SYSCTL_ZERO,
157 .extra2 = SYSCTL_ONE_H
158 };
159 void __user *buffer = (void __user *)k
160
161 /*
162 * We don't care about our buffer leng
163 * non-zero file position.
164 */
165 size_t len = 1234;
166 /*
167 * proc_dointvec should refuse to read
168 * pos is non-zero.
169 */
170 loff_t pos = 1;
171
172 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
173
174 KUNIT_EXPECT_EQ(test, 0, len);
175 }
176
177 /*
178 * Test that we can read a two digit number in
179 * Nothing fancy.
180 */
181 static void sysctl_test_dointvec_read_happy_si
182 {
183 int data = 0;
184 /* Good table. */
185 struct ctl_table table = {
186 .procname = "foo",
187 .data = &data,
188 .maxlen = sizeof(int),
189 .mode = 0644,
190 .proc_handler = proc_dointve
191 .extra1 = SYSCTL_ZERO,
192 .extra2 = SYSCTL_ONE_H
193 };
194 size_t len = 4;
195 loff_t pos = 0;
196 char *buffer = kunit_kzalloc(test, len
197 char __user *user_buffer = (char __use
198 /* Store 13 in the data field. */
199 *((int *)table.data) = 13;
200
201 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
202
203 KUNIT_ASSERT_EQ(test, 3, len);
204 buffer[len] = '\0';
205 /* And we read 13 back out. */
206 KUNIT_EXPECT_STREQ(test, "13\n", buffe
207 }
208
209 /*
210 * Same as previous test, just now with negati
211 */
212 static void sysctl_test_dointvec_read_happy_si
213 {
214 int data = 0;
215 /* Good table. */
216 struct ctl_table table = {
217 .procname = "foo",
218 .data = &data,
219 .maxlen = sizeof(int),
220 .mode = 0644,
221 .proc_handler = proc_dointve
222 .extra1 = SYSCTL_ZERO,
223 .extra2 = SYSCTL_ONE_H
224 };
225 size_t len = 5;
226 loff_t pos = 0;
227 char *buffer = kunit_kzalloc(test, len
228 char __user *user_buffer = (char __use
229 *((int *)table.data) = -16;
230
231 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
232
233 KUNIT_ASSERT_EQ(test, 4, len);
234 buffer[len] = '\0';
235 KUNIT_EXPECT_STREQ(test, "-16\n", buff
236 }
237
238 /*
239 * Test that a simple positive write works.
240 */
241 static void sysctl_test_dointvec_write_happy_s
242 {
243 int data = 0;
244 /* Good table. */
245 struct ctl_table table = {
246 .procname = "foo",
247 .data = &data,
248 .maxlen = sizeof(int),
249 .mode = 0644,
250 .proc_handler = proc_dointve
251 .extra1 = SYSCTL_ZERO,
252 .extra2 = SYSCTL_ONE_H
253 };
254 char input[] = "9";
255 size_t len = sizeof(input) - 1;
256 loff_t pos = 0;
257 char *buffer = kunit_kzalloc(test, len
258 char __user *user_buffer = (char __use
259
260 memcpy(buffer, input, len);
261
262 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
263
264 KUNIT_EXPECT_EQ(test, sizeof(input) -
265 KUNIT_EXPECT_EQ(test, sizeof(input) -
266 KUNIT_EXPECT_EQ(test, 9, *((int *)tabl
267 }
268
269 /*
270 * Same as previous test, but now with negativ
271 */
272 static void sysctl_test_dointvec_write_happy_s
273 {
274 int data = 0;
275 struct ctl_table table = {
276 .procname = "foo",
277 .data = &data,
278 .maxlen = sizeof(int),
279 .mode = 0644,
280 .proc_handler = proc_dointve
281 .extra1 = SYSCTL_ZERO,
282 .extra2 = SYSCTL_ONE_H
283 };
284 char input[] = "-9";
285 size_t len = sizeof(input) - 1;
286 loff_t pos = 0;
287 char *buffer = kunit_kzalloc(test, len
288 char __user *user_buffer = (char __use
289
290 memcpy(buffer, input, len);
291
292 KUNIT_EXPECT_EQ(test, 0, proc_dointvec
293
294 KUNIT_EXPECT_EQ(test, sizeof(input) -
295 KUNIT_EXPECT_EQ(test, sizeof(input) -
296 KUNIT_EXPECT_EQ(test, -9, *((int *)tab
297 }
298
299 /*
300 * Test that writing a value smaller than the
301 * allowed.
302 */
303 static void sysctl_test_api_dointvec_write_sin
304 struct kunit *test)
305 {
306 int data = 0;
307 struct ctl_table table = {
308 .procname = "foo",
309 .data = &data,
310 .maxlen = sizeof(int),
311 .mode = 0644,
312 .proc_handler = proc_dointve
313 .extra1 = SYSCTL_ZERO,
314 .extra2 = SYSCTL_ONE_H
315 };
316 size_t max_len = 32, len = max_len;
317 loff_t pos = 0;
318 char *buffer = kunit_kzalloc(test, max
319 char __user *user_buffer = (char __use
320 unsigned long abs_of_less_than_min = (
321 -
322
323 /*
324 * We use this rigmarole to create a s
325 * less than the minimum accepted valu
326 */
327 KUNIT_ASSERT_LT(test,
328 (size_t)snprintf(buffe
329 abs_o
330 max_len);
331
332 KUNIT_EXPECT_EQ(test, -EINVAL, proc_do
333
334 KUNIT_EXPECT_EQ(test, max_len, len);
335 KUNIT_EXPECT_EQ(test, 0, *((int *)tabl
336 }
337
338 /*
339 * Test that writing the maximum possible valu
340 */
341 static void sysctl_test_api_dointvec_write_sin
342 struct kunit *test)
343 {
344 int data = 0;
345 struct ctl_table table = {
346 .procname = "foo",
347 .data = &data,
348 .maxlen = sizeof(int),
349 .mode = 0644,
350 .proc_handler = proc_dointve
351 .extra1 = SYSCTL_ZERO,
352 .extra2 = SYSCTL_ONE_H
353 };
354 size_t max_len = 32, len = max_len;
355 loff_t pos = 0;
356 char *buffer = kunit_kzalloc(test, max
357 char __user *user_buffer = (char __use
358 unsigned long greater_than_max = (unsi
359
360 KUNIT_ASSERT_GT(test, greater_than_max
361 KUNIT_ASSERT_LT(test, (size_t)snprintf
362
363 max_len);
364 KUNIT_EXPECT_EQ(test, -EINVAL, proc_do
365
366 KUNIT_ASSERT_EQ(test, max_len, len);
367 KUNIT_EXPECT_EQ(test, 0, *((int *)tabl
368 }
369
370 /*
371 * Test that registering an invalid extra valu
372 */
373 static void sysctl_test_register_sysctl_sz_inv
374 struct kunit *test)
375 {
376 unsigned char data = 0;
377 struct ctl_table table_foo[] = {
378 {
379 .procname = "foo
380 .data = &dat
381 .maxlen = size
382 .mode = 0644
383 .proc_handler = proc
384 .extra1 = SYSC
385 .extra2 = SYSC
386 },
387 };
388
389 struct ctl_table table_bar[] = {
390 {
391 .procname = "bar
392 .data = &dat
393 .maxlen = size
394 .mode = 0644
395 .proc_handler = proc
396 .extra1 = SYSC
397 .extra2 = SYSC
398 },
399 };
400
401 struct ctl_table table_qux[] = {
402 {
403 .procname = "qux
404 .data = &dat
405 .maxlen = size
406 .mode = 0644
407 .proc_handler = proc
408 .extra1 = SYSC
409 .extra2 = SYSC
410 },
411 };
412
413 KUNIT_EXPECT_NULL(test, register_sysct
414 KUNIT_EXPECT_NULL(test, register_sysct
415 KUNIT_EXPECT_NOT_NULL(test, register_s
416 }
417
418 static struct kunit_case sysctl_test_cases[] =
419 KUNIT_CASE(sysctl_test_api_dointvec_nu
420 KUNIT_CASE(sysctl_test_api_dointvec_ta
421 KUNIT_CASE(sysctl_test_api_dointvec_ta
422 KUNIT_CASE(sysctl_test_api_dointvec_ta
423 KUNIT_CASE(sysctl_test_dointvec_read_h
424 KUNIT_CASE(sysctl_test_dointvec_read_h
425 KUNIT_CASE(sysctl_test_dointvec_write_
426 KUNIT_CASE(sysctl_test_dointvec_write_
427 KUNIT_CASE(sysctl_test_api_dointvec_wr
428 KUNIT_CASE(sysctl_test_api_dointvec_wr
429 KUNIT_CASE(sysctl_test_register_sysctl
430 {}
431 };
432
433 static struct kunit_suite sysctl_test_suite =
434 .name = "sysctl_test",
435 .test_cases = sysctl_test_cases,
436 };
437
438 kunit_test_suites(&sysctl_test_suite);
439
440 MODULE_DESCRIPTION("KUnit test of proc sysctl"
441 MODULE_LICENSE("GPL v2");
442
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