[thirdparty/linux.git] / kernel / sysctl-test.c

// SPDX-License-Identifier: GPL-2.0
/*
 * KUnit test of proc sysctl.
 */

#include <kunit/test.h>
#include <linux/sysctl.h>

#define KUNIT_PROC_READ 0
#define KUNIT_PROC_WRITE 1

static int i_zero;
static int i_one_hundred = 100;

/*
 * Test that proc_dointvec will not try to use a NULL .data field even when the
 * length is non-zero.
 */
static void sysctl_test_api_dointvec_null_tbl_data(struct kunit *test)
{
	struct ctl_table null_data_table = {
		.procname = "foo",
		/*
		 * Here we are testing that proc_dointvec behaves correctly when
		 * we give it a NULL .data field. Normally this would point to a
		 * piece of memory where the value would be stored.
		 */
		.data		= NULL,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	/*
	 * proc_dointvec expects a buffer in user space, so we allocate one. We
	 * also need to cast it to __user so sparse doesn't get mad.
	 */
	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
							   GFP_USER);
	size_t len;
	loff_t pos;

	/*
	 * We don't care what the starting length is since proc_dointvec should
	 * not try to read because .data is NULL.
	 */
	len = 1234;
	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
					       KUNIT_PROC_READ, buffer, &len,
					       &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);

	/*
	 * See above.
	 */
	len = 1234;
	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
					       KUNIT_PROC_WRITE, buffer, &len,
					       &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);
}

/*
 * Similar to the previous test, we create a struct ctrl_table that has a .data
 * field that proc_dointvec cannot do anything with; however, this time it is
 * because we tell proc_dointvec that the size is 0.
 */
static void sysctl_test_api_dointvec_table_maxlen_unset(struct kunit *test)
{
	int data = 0;
	struct ctl_table data_maxlen_unset_table = {
		.procname = "foo",
		.data		= &data,
		/*
		 * So .data is no longer NULL, but we tell proc_dointvec its
		 * length is 0, so it still shouldn't try to use it.
		 */
		.maxlen		= 0,
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
							   GFP_USER);
	size_t len;
	loff_t pos;

	/*
	 * As before, we don't care what buffer length is because proc_dointvec
	 * cannot do anything because its internal .data buffer has zero length.
	 */
	len = 1234;
	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&data_maxlen_unset_table,
					       KUNIT_PROC_READ, buffer, &len,
					       &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);

	/*
	 * See previous comment.
	 */
	len = 1234;
	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&data_maxlen_unset_table,
					       KUNIT_PROC_WRITE, buffer, &len,
					       &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);
}

/*
 * Here we provide a valid struct ctl_table, but we try to read and write from
 * it using a buffer of zero length, so it should still fail in a similar way as
 * before.
 */
static void sysctl_test_api_dointvec_table_len_is_zero(struct kunit *test)
{
	int data = 0;
	/* Good table. */
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
							   GFP_USER);
	/*
	 * However, now our read/write buffer has zero length.
	 */
	size_t len = 0;
	loff_t pos;

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ, buffer,
					       &len, &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE, buffer,
					       &len, &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);
}

/*
 * Test that proc_dointvec refuses to read when the file position is non-zero.
 */
static void sysctl_test_api_dointvec_table_read_but_position_set(
		struct kunit *test)
{
	int data = 0;
	/* Good table. */
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
							   GFP_USER);
	/*
	 * We don't care about our buffer length because we start off with a
	 * non-zero file position.
	 */
	size_t len = 1234;
	/*
	 * proc_dointvec should refuse to read into the buffer since the file
	 * pos is non-zero.
	 */
	loff_t pos = 1;

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ, buffer,
					       &len, &pos));
	KUNIT_EXPECT_EQ(test, (size_t)0, len);
}

/*
 * Test that we can read a two digit number in a sufficiently size buffer.
 * Nothing fancy.
 */
static void sysctl_test_dointvec_read_happy_single_positive(struct kunit *test)
{
	int data = 0;
	/* Good table. */
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	size_t len = 4;
	loff_t pos = 0;
	char *buffer = kunit_kzalloc(test, len, GFP_USER);
	char __user *user_buffer = (char __user *)buffer;
	/* Store 13 in the data field. */
	*((int *)table.data) = 13;

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ,
					       user_buffer, &len, &pos));
	KUNIT_ASSERT_EQ(test, (size_t)3, len);
	buffer[len] = '\0';
	/* And we read 13 back out. */
	KUNIT_EXPECT_STREQ(test, "13\n", buffer);
}

/*
 * Same as previous test, just now with negative numbers.
 */
static void sysctl_test_dointvec_read_happy_single_negative(struct kunit *test)
{
	int data = 0;
	/* Good table. */
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	size_t len = 5;
	loff_t pos = 0;
	char *buffer = kunit_kzalloc(test, len, GFP_USER);
	char __user *user_buffer = (char __user *)buffer;
	*((int *)table.data) = -16;

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ,
					       user_buffer, &len, &pos));
	KUNIT_ASSERT_EQ(test, (size_t)4, len);
	buffer[len] = '\0';
	KUNIT_EXPECT_STREQ(test, "-16\n", (char *)buffer);
}

/*
 * Test that a simple positive write works.
 */
static void sysctl_test_dointvec_write_happy_single_positive(struct kunit *test)
{
	int data = 0;
	/* Good table. */
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	char input[] = "9";
	size_t len = sizeof(input) - 1;
	loff_t pos = 0;
	char *buffer = kunit_kzalloc(test, len, GFP_USER);
	char __user *user_buffer = (char __user *)buffer;

	memcpy(buffer, input, len);

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE,
					       user_buffer, &len, &pos));
	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, (size_t)pos);
	KUNIT_EXPECT_EQ(test, 9, *((int *)table.data));
}

/*
 * Same as previous test, but now with negative numbers.
 */
static void sysctl_test_dointvec_write_happy_single_negative(struct kunit *test)
{
	int data = 0;
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	char input[] = "-9";
	size_t len = sizeof(input) - 1;
	loff_t pos = 0;
	char *buffer = kunit_kzalloc(test, len, GFP_USER);
	char __user *user_buffer = (char __user *)buffer;

	memcpy(buffer, input, len);

	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE,
					       user_buffer, &len, &pos));
	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, (size_t)pos);
	KUNIT_EXPECT_EQ(test, -9, *((int *)table.data));
}

/*
 * Test that writing a value smaller than the minimum possible value is not
 * allowed.
 */
static void sysctl_test_api_dointvec_write_single_less_int_min(
		struct kunit *test)
{
	int data = 0;
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	size_t max_len = 32, len = max_len;
	loff_t pos = 0;
	char *buffer = kunit_kzalloc(test, max_len, GFP_USER);
	char __user *user_buffer = (char __user *)buffer;
	unsigned long abs_of_less_than_min = (unsigned long)INT_MAX
					     - (INT_MAX + INT_MIN) + 1;

	/*
	 * We use this rigmarole to create a string that contains a value one
	 * less than the minimum accepted value.
	 */
	KUNIT_ASSERT_LT(test,
			(size_t)snprintf(buffer, max_len, "-%lu",
					 abs_of_less_than_min),
			max_len);

	KUNIT_EXPECT_EQ(test, -EINVAL, proc_dointvec(&table, KUNIT_PROC_WRITE,
						     user_buffer, &len, &pos));
	KUNIT_EXPECT_EQ(test, max_len, len);
	KUNIT_EXPECT_EQ(test, 0, *((int *)table.data));
}

/*
 * Test that writing the maximum possible value works.
 */
static void sysctl_test_api_dointvec_write_single_greater_int_max(
		struct kunit *test)
{
	int data = 0;
	struct ctl_table table = {
		.procname = "foo",
		.data		= &data,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	};
	size_t max_len = 32, len = max_len;
	loff_t pos = 0;
	char *buffer = kunit_kzalloc(test, max_len, GFP_USER);
	char __user *user_buffer = (char __user *)buffer;
	unsigned long greater_than_max = (unsigned long)INT_MAX + 1;

	KUNIT_ASSERT_GT(test, greater_than_max, (unsigned long)INT_MAX);
	KUNIT_ASSERT_LT(test, (size_t)snprintf(buffer, max_len, "%lu",
					       greater_than_max),
			max_len);
	KUNIT_EXPECT_EQ(test, -EINVAL, proc_dointvec(&table, KUNIT_PROC_WRITE,
						     user_buffer, &len, &pos));
	KUNIT_ASSERT_EQ(test, max_len, len);
	KUNIT_EXPECT_EQ(test, 0, *((int *)table.data));
}

static struct kunit_case sysctl_test_cases[] = {
	KUNIT_CASE(sysctl_test_api_dointvec_null_tbl_data),
	KUNIT_CASE(sysctl_test_api_dointvec_table_maxlen_unset),
	KUNIT_CASE(sysctl_test_api_dointvec_table_len_is_zero),
	KUNIT_CASE(sysctl_test_api_dointvec_table_read_but_position_set),
	KUNIT_CASE(sysctl_test_dointvec_read_happy_single_positive),
	KUNIT_CASE(sysctl_test_dointvec_read_happy_single_negative),
	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_positive),
	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_negative),
	KUNIT_CASE(sysctl_test_api_dointvec_write_single_less_int_min),
	KUNIT_CASE(sysctl_test_api_dointvec_write_single_greater_int_max),
	{}
};

static struct kunit_suite sysctl_test_suite = {
	.name = "sysctl_test",
	.test_cases = sysctl_test_cases,
};

kunit_test_suites(&sysctl_test_suite);

MODULE_LICENSE("GPL v2");
Commit	Line	Data
2cb80dbb IZ	1	// SPDX-License-Identifier: GPL-2.0
	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	static int i_zero;
	13	static int i_one_hundred = 100;
	14
	15	/*
	16	* Test that proc_dointvec will not try to use a NULL .data field even when the
	17	* length is non-zero.
	18	*/
	19	static void sysctl_test_api_dointvec_null_tbl_data(struct kunit *test)
	20	{
	21	struct ctl_table null_data_table = {
	22	.procname = "foo",
	23	/*
	24	* Here we are testing that proc_dointvec behaves correctly when
	25	* we give it a NULL .data field. Normally this would point to a
	26	* piece of memory where the value would be stored.
	27	*/
	28	.data = NULL,
	29	.maxlen = sizeof(int),
	30	.mode = 0644,
	31	.proc_handler = proc_dointvec,
	32	.extra1 = &i_zero,
	33	.extra2 = &i_one_hundred,
	34	};
	35	/*
	36	* proc_dointvec expects a buffer in user space, so we allocate one. We
	37	* also need to cast it to __user so sparse doesn't get mad.
	38	*/
	39	void __user buffer = (void __user )kunit_kzalloc(test, sizeof(int),
	40	GFP_USER);
	41	size_t len;
	42	loff_t pos;
	43
	44	/*
	45	* We don't care what the starting length is since proc_dointvec should
	46	* not try to read because .data is NULL.
	47	*/
	48	len = 1234;
	49	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
	50	KUNIT_PROC_READ, buffer, &len,
	51	&pos));
	52	KUNIT_EXPECT_EQ(test, (size_t)0, len);
	53
	54	/*
	55	* See above.
	56	*/
	57	len = 1234;
	58	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
	59	KUNIT_PROC_WRITE, buffer, &len,
	60	&pos));
	61	KUNIT_EXPECT_EQ(test, (size_t)0, len);
	62	}
	63
	64	/*
65	* Similar to the previous test, we create a struct ctrl_table that has a .data
66	* field that proc_dointvec cannot do anything with; however, this time it is
67	* because we tell proc_dointvec that the size is 0.
68	*/
69	static void sysctl_test_api_dointvec_table_maxlen_unset(struct kunit *test)
70	{
71	int data = 0;
72	struct ctl_table data_maxlen_unset_table = {
73	.procname = "foo",
74	.data = &data,
75	/*
76	* So .data is no longer NULL, but we tell proc_dointvec its
77	* length is 0, so it still shouldn't try to use it.
78	*/
79	.maxlen = 0,
80	.mode = 0644,
81	.proc_handler = proc_dointvec,
82	.extra1 = &i_zero,
83	.extra2 = &i_one_hundred,
84	};
85	void __user buffer = (void __user )kunit_kzalloc(test, sizeof(int),
86	GFP_USER);
87	size_t len;
88	loff_t pos;
89
90	/*
91	* As before, we don't care what buffer length is because proc_dointvec
92	* cannot do anything because its internal .data buffer has zero length.
93	*/
94	len = 1234;
95	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&data_maxlen_unset_table,
96	KUNIT_PROC_READ, buffer, &len,
97	&pos));
98	KUNIT_EXPECT_EQ(test, (size_t)0, len);
99
100	/*
101	* See previous comment.
102	*/
103	len = 1234;
104	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&data_maxlen_unset_table,
105	KUNIT_PROC_WRITE, buffer, &len,
106	&pos));
107	KUNIT_EXPECT_EQ(test, (size_t)0, len);
108	}
109
110	/*
111	* Here we provide a valid struct ctl_table, but we try to read and write from
112	* it using a buffer of zero length, so it should still fail in a similar way as
113	* before.
114	*/
115	static void sysctl_test_api_dointvec_table_len_is_zero(struct kunit *test)
116	{
117	int data = 0;
118	/* Good table. */
119	struct ctl_table table = {
120	.procname = "foo",
121	.data = &data,
122	.maxlen = sizeof(int),
123	.mode = 0644,
124	.proc_handler = proc_dointvec,
125	.extra1 = &i_zero,
126	.extra2 = &i_one_hundred,
127	};
128	void __user buffer = (void __user )kunit_kzalloc(test, sizeof(int),
129	GFP_USER);
130	/*
131	* However, now our read/write buffer has zero length.
132	*/
133	size_t len = 0;
134	loff_t pos;
135
136	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ, buffer,
137	&len, &pos));
138	KUNIT_EXPECT_EQ(test, (size_t)0, len);
139
140	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE, buffer,
141	&len, &pos));
142	KUNIT_EXPECT_EQ(test, (size_t)0, len);
143	}
144
145	/*
146	* Test that proc_dointvec refuses to read when the file position is non-zero.
147	*/
148	static void sysctl_test_api_dointvec_table_read_but_position_set(
149	struct kunit *test)
150	{
151	int data = 0;
152	/* Good table. */
153	struct ctl_table table = {
154	.procname = "foo",
155	.data = &data,
156	.maxlen = sizeof(int),
157	.mode = 0644,
158	.proc_handler = proc_dointvec,
159	.extra1 = &i_zero,
160	.extra2 = &i_one_hundred,
161	};
162	void __user buffer = (void __user )kunit_kzalloc(test, sizeof(int),
163	GFP_USER);
164	/*
165	* We don't care about our buffer length because we start off with a
166	* non-zero file position.
167	*/
168	size_t len = 1234;
169	/*
170	* proc_dointvec should refuse to read into the buffer since the file
171	* pos is non-zero.
172	*/
173	loff_t pos = 1;
174
175	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ, buffer,
176	&len, &pos));
177	KUNIT_EXPECT_EQ(test, (size_t)0, len);
178	}
179
180	/*
181	* Test that we can read a two digit number in a sufficiently size buffer.
182	* Nothing fancy.
183	*/
184	static void sysctl_test_dointvec_read_happy_single_positive(struct kunit *test)
185	{
186	int data = 0;
187	/* Good table. */
188	struct ctl_table table = {
189	.procname = "foo",
190	.data = &data,
191	.maxlen = sizeof(int),
192	.mode = 0644,
193	.proc_handler = proc_dointvec,
194	.extra1 = &i_zero,
195	.extra2 = &i_one_hundred,
196	};
197	size_t len = 4;
198	loff_t pos = 0;
199	char *buffer = kunit_kzalloc(test, len, GFP_USER);
200	char __user user_buffer = (char __user )buffer;
201	/* Store 13 in the data field. */
202	((int )table.data) = 13;
203
204	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ,
205	user_buffer, &len, &pos));
206	KUNIT_ASSERT_EQ(test, (size_t)3, len);
207	buffer[len] = '\0';
208	/* And we read 13 back out. */
209	KUNIT_EXPECT_STREQ(test, "13\n", buffer);
210	}
211
212	/*
213	* Same as previous test, just now with negative numbers.
214	*/
215	static void sysctl_test_dointvec_read_happy_single_negative(struct kunit *test)
216	{
217	int data = 0;
218	/* Good table. */
219	struct ctl_table table = {
220	.procname = "foo",
221	.data = &data,
222	.maxlen = sizeof(int),
223	.mode = 0644,
224	.proc_handler = proc_dointvec,
225	.extra1 = &i_zero,
226	.extra2 = &i_one_hundred,
227	};
228	size_t len = 5;
229	loff_t pos = 0;
230	char *buffer = kunit_kzalloc(test, len, GFP_USER);
231	char __user user_buffer = (char __user )buffer;
232	((int )table.data) = -16;
233
234	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ,
235	user_buffer, &len, &pos));
236	KUNIT_ASSERT_EQ(test, (size_t)4, len);
237	buffer[len] = '\0';
238	KUNIT_EXPECT_STREQ(test, "-16\n", (char *)buffer);
239	}
240
241	/*
242	* Test that a simple positive write works.
243	*/
244	static void sysctl_test_dointvec_write_happy_single_positive(struct kunit *test)
245	{
246	int data = 0;
247	/* Good table. */
248	struct ctl_table table = {
249	.procname = "foo",
250	.data = &data,
251	.maxlen = sizeof(int),
252	.mode = 0644,
253	.proc_handler = proc_dointvec,
254	.extra1 = &i_zero,
255	.extra2 = &i_one_hundred,
256	};
257	char input[] = "9";
258	size_t len = sizeof(input) - 1;
259	loff_t pos = 0;
260	char *buffer = kunit_kzalloc(test, len, GFP_USER);
261	char __user user_buffer = (char __user )buffer;
262
263	memcpy(buffer, input, len);
264
265	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE,
266	user_buffer, &len, &pos));
267	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
268	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, (size_t)pos);
269	KUNIT_EXPECT_EQ(test, 9, ((int )table.data));
270	}
271
272	/*
273	* Same as previous test, but now with negative numbers.
274	*/
275	static void sysctl_test_dointvec_write_happy_single_negative(struct kunit *test)
276	{
277	int data = 0;
278	struct ctl_table table = {
279	.procname = "foo",
280	.data = &data,
281	.maxlen = sizeof(int),
282	.mode = 0644,
283	.proc_handler = proc_dointvec,
284	.extra1 = &i_zero,
285	.extra2 = &i_one_hundred,
286	};
287	char input[] = "-9";
288	size_t len = sizeof(input) - 1;
289	loff_t pos = 0;
290	char *buffer = kunit_kzalloc(test, len, GFP_USER);
291	char __user user_buffer = (char __user )buffer;
292
293	memcpy(buffer, input, len);
294
295	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE,
296	user_buffer, &len, &pos));
297	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
298	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, (size_t)pos);
299	KUNIT_EXPECT_EQ(test, -9, ((int )table.data));
300	}
301
302	/*
303	* Test that writing a value smaller than the minimum possible value is not
304	* allowed.
305	*/
306	static void sysctl_test_api_dointvec_write_single_less_int_min(
307	struct kunit *test)
308	{
309	int data = 0;
310	struct ctl_table table = {
311	.procname = "foo",
312	.data = &data,
313	.maxlen = sizeof(int),
314	.mode = 0644,
315	.proc_handler = proc_dointvec,
316	.extra1 = &i_zero,
317	.extra2 = &i_one_hundred,
318	};
319	size_t max_len = 32, len = max_len;
320	loff_t pos = 0;
321	char *buffer = kunit_kzalloc(test, max_len, GFP_USER);
322	char __user user_buffer = (char __user )buffer;
323	unsigned long abs_of_less_than_min = (unsigned long)INT_MAX
324	- (INT_MAX + INT_MIN) + 1;
325
326	/*
327	* We use this rigmarole to create a string that contains a value one
328	* less than the minimum accepted value.
329	*/
330	KUNIT_ASSERT_LT(test,
331	(size_t)snprintf(buffer, max_len, "-%lu",
332	abs_of_less_than_min),
333	max_len);
334
335	KUNIT_EXPECT_EQ(test, -EINVAL, proc_dointvec(&table, KUNIT_PROC_WRITE,
336	user_buffer, &len, &pos));
337	KUNIT_EXPECT_EQ(test, max_len, len);
338	KUNIT_EXPECT_EQ(test, 0, ((int )table.data));
339	}
340
341	/*
342	* Test that writing the maximum possible value works.
343	*/
344	static void sysctl_test_api_dointvec_write_single_greater_int_max(
345	struct kunit *test)
346	{
347	int data = 0;
348	struct ctl_table table = {
349	.procname = "foo",
350	.data = &data,
351	.maxlen = sizeof(int),
352	.mode = 0644,
353	.proc_handler = proc_dointvec,
354	.extra1 = &i_zero,
355	.extra2 = &i_one_hundred,
356	};
357	size_t max_len = 32, len = max_len;
358	loff_t pos = 0;
359	char *buffer = kunit_kzalloc(test, max_len, GFP_USER);
360	char __user user_buffer = (char __user )buffer;
361	unsigned long greater_than_max = (unsigned long)INT_MAX + 1;
362
363	KUNIT_ASSERT_GT(test, greater_than_max, (unsigned long)INT_MAX);
364	KUNIT_ASSERT_LT(test, (size_t)snprintf(buffer, max_len, "%lu",
365	greater_than_max),
366	max_len);
367	KUNIT_EXPECT_EQ(test, -EINVAL, proc_dointvec(&table, KUNIT_PROC_WRITE,
368	user_buffer, &len, &pos));
369	KUNIT_ASSERT_EQ(test, max_len, len);
370	KUNIT_EXPECT_EQ(test, 0, ((int )table.data));
371	}
372
373	static struct kunit_case sysctl_test_cases[] = {
374	KUNIT_CASE(sysctl_test_api_dointvec_null_tbl_data),
375	KUNIT_CASE(sysctl_test_api_dointvec_table_maxlen_unset),
376	KUNIT_CASE(sysctl_test_api_dointvec_table_len_is_zero),
377	KUNIT_CASE(sysctl_test_api_dointvec_table_read_but_position_set),
378	KUNIT_CASE(sysctl_test_dointvec_read_happy_single_positive),
379	KUNIT_CASE(sysctl_test_dointvec_read_happy_single_negative),
380	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_positive),
381	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_negative),
382	KUNIT_CASE(sysctl_test_api_dointvec_write_single_less_int_min),
383	KUNIT_CASE(sysctl_test_api_dointvec_write_single_greater_int_max),
384	{}
385	};
386
387	static struct kunit_suite sysctl_test_suite = {
388	.name = "sysctl_test",
389	.test_cases = sysctl_test_cases,
390	};
391
c475c77d AM	392	kunit_test_suites(&sysctl_test_suite);
	393
	394	MODULE_LICENSE("GPL v2");