1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * test_fprobe.c - simple sanity test for fpro
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/fprobe.h>
8 #include <linux/random.h>
9 #include <kunit/test.h>
10
11 #define div_factor 3
12
13 static struct kunit *current_test;
14
15 static u32 rand1, entry_val, exit_val;
16
17 /* Use indirect calls to avoid inlining the ta
18 static u32 (*target)(u32 value);
19 static u32 (*target2)(u32 value);
20 static u32 (*target_nest)(u32 value, u32 (*nes
21 static unsigned long target_ip;
22 static unsigned long target2_ip;
23 static unsigned long target_nest_ip;
24 static int entry_return_value;
25
26 static noinline u32 fprobe_selftest_target(u32
27 {
28 return (value / div_factor);
29 }
30
31 static noinline u32 fprobe_selftest_target2(u3
32 {
33 return (value / div_factor) + 1;
34 }
35
36 static noinline u32 fprobe_selftest_nest_targe
37 {
38 return nest(value + 2);
39 }
40
41 static notrace int fp_entry_handler(struct fpr
42 unsigned l
43 struct pt_
44 {
45 KUNIT_EXPECT_FALSE(current_test, preem
46 /* This can be called on the fprobe_se
47 if (ip != target_ip)
48 KUNIT_EXPECT_EQ(current_test,
49 entry_val = (rand1 / div_factor);
50 if (fp->entry_data_size) {
51 KUNIT_EXPECT_NOT_NULL(current_
52 if (data)
53 *(u32 *)data = entry_v
54 } else
55 KUNIT_EXPECT_NULL(current_test
56
57 return entry_return_value;
58 }
59
60 static notrace void fp_exit_handler(struct fpr
61 unsigned l
62 struct pt_
63 {
64 unsigned long ret = regs_return_value(
65
66 KUNIT_EXPECT_FALSE(current_test, preem
67 if (ip != target_ip) {
68 KUNIT_EXPECT_EQ(current_test,
69 KUNIT_EXPECT_EQ(current_test,
70 } else
71 KUNIT_EXPECT_EQ(current_test,
72 KUNIT_EXPECT_EQ(current_test, entry_va
73 exit_val = entry_val + div_factor;
74 if (fp->entry_data_size) {
75 KUNIT_EXPECT_NOT_NULL(current_
76 if (data)
77 KUNIT_EXPECT_EQ(curren
78 } else
79 KUNIT_EXPECT_NULL(current_test
80 }
81
82 static notrace int nest_entry_handler(struct f
83 unsigned
84 struct p
85 {
86 KUNIT_EXPECT_FALSE(current_test, preem
87 return 0;
88 }
89
90 static notrace void nest_exit_handler(struct f
91 unsigned
92 struct p
93 {
94 KUNIT_EXPECT_FALSE(current_test, preem
95 KUNIT_EXPECT_EQ(current_test, ip, targ
96 }
97
98 /* Test entry only (no rethook) */
99 static void test_fprobe_entry(struct kunit *te
100 {
101 struct fprobe fp_entry = {
102 .entry_handler = fp_entry_hand
103 };
104
105 current_test = test;
106
107 /* Before register, unregister should
108 KUNIT_EXPECT_NE(test, 0, unregister_fp
109 KUNIT_EXPECT_EQ(test, 0, register_fpro
110
111 entry_val = 0;
112 exit_val = 0;
113 target(rand1);
114 KUNIT_EXPECT_NE(test, 0, entry_val);
115 KUNIT_EXPECT_EQ(test, 0, exit_val);
116
117 entry_val = 0;
118 exit_val = 0;
119 target2(rand1);
120 KUNIT_EXPECT_NE(test, 0, entry_val);
121 KUNIT_EXPECT_EQ(test, 0, exit_val);
122
123 KUNIT_EXPECT_EQ(test, 0, unregister_fp
124 }
125
126 static void test_fprobe(struct kunit *test)
127 {
128 struct fprobe fp = {
129 .entry_handler = fp_entry_hand
130 .exit_handler = fp_exit_handle
131 };
132
133 current_test = test;
134 KUNIT_EXPECT_EQ(test, 0, register_fpro
135
136 entry_val = 0;
137 exit_val = 0;
138 target(rand1);
139 KUNIT_EXPECT_NE(test, 0, entry_val);
140 KUNIT_EXPECT_EQ(test, entry_val + div_
141
142 entry_val = 0;
143 exit_val = 0;
144 target2(rand1);
145 KUNIT_EXPECT_NE(test, 0, entry_val);
146 KUNIT_EXPECT_EQ(test, entry_val + div_
147
148 KUNIT_EXPECT_EQ(test, 0, unregister_fp
149 }
150
151 static void test_fprobe_syms(struct kunit *tes
152 {
153 static const char *syms[] = {"fprobe_s
154 struct fprobe fp = {
155 .entry_handler = fp_entry_hand
156 .exit_handler = fp_exit_handle
157 };
158
159 current_test = test;
160 KUNIT_EXPECT_EQ(test, 0, register_fpro
161
162 entry_val = 0;
163 exit_val = 0;
164 target(rand1);
165 KUNIT_EXPECT_NE(test, 0, entry_val);
166 KUNIT_EXPECT_EQ(test, entry_val + div_
167
168 entry_val = 0;
169 exit_val = 0;
170 target2(rand1);
171 KUNIT_EXPECT_NE(test, 0, entry_val);
172 KUNIT_EXPECT_EQ(test, entry_val + div_
173
174 KUNIT_EXPECT_EQ(test, 0, unregister_fp
175 }
176
177 /* Test private entry_data */
178 static void test_fprobe_data(struct kunit *tes
179 {
180 struct fprobe fp = {
181 .entry_handler = fp_entry_hand
182 .exit_handler = fp_exit_handle
183 .entry_data_size = sizeof(u32)
184 };
185
186 current_test = test;
187 KUNIT_EXPECT_EQ(test, 0, register_fpro
188
189 target(rand1);
190
191 KUNIT_EXPECT_EQ(test, 0, unregister_fp
192 }
193
194 /* Test nr_maxactive */
195 static void test_fprobe_nest(struct kunit *tes
196 {
197 static const char *syms[] = {"fprobe_s
198 struct fprobe fp = {
199 .entry_handler = nest_entry_ha
200 .exit_handler = nest_exit_hand
201 .nr_maxactive = 1,
202 };
203
204 current_test = test;
205 KUNIT_EXPECT_EQ(test, 0, register_fpro
206
207 target_nest(rand1, target);
208 KUNIT_EXPECT_EQ(test, 1, fp.nmissed);
209
210 KUNIT_EXPECT_EQ(test, 0, unregister_fp
211 }
212
213 static void test_fprobe_skip(struct kunit *tes
214 {
215 struct fprobe fp = {
216 .entry_handler = fp_entry_hand
217 .exit_handler = fp_exit_handle
218 };
219
220 current_test = test;
221 KUNIT_EXPECT_EQ(test, 0, register_fpro
222
223 entry_return_value = 1;
224 entry_val = 0;
225 exit_val = 0;
226 target(rand1);
227 KUNIT_EXPECT_NE(test, 0, entry_val);
228 KUNIT_EXPECT_EQ(test, 0, exit_val);
229 KUNIT_EXPECT_EQ(test, 0, fp.nmissed);
230 entry_return_value = 0;
231
232 KUNIT_EXPECT_EQ(test, 0, unregister_fp
233 }
234
235 static unsigned long get_ftrace_location(void
236 {
237 unsigned long size, addr = (unsigned l
238
239 if (!kallsyms_lookup_size_offset(addr,
240 return 0;
241
242 return ftrace_location_range(addr, add
243 }
244
245 static int fprobe_test_init(struct kunit *test
246 {
247 rand1 = get_random_u32_above(div_facto
248 target = fprobe_selftest_target;
249 target2 = fprobe_selftest_target2;
250 target_nest = fprobe_selftest_nest_tar
251 target_ip = get_ftrace_location(target
252 target2_ip = get_ftrace_location(targe
253 target_nest_ip = get_ftrace_location(t
254
255 return 0;
256 }
257
258 static struct kunit_case fprobe_testcases[] =
259 KUNIT_CASE(test_fprobe_entry),
260 KUNIT_CASE(test_fprobe),
261 KUNIT_CASE(test_fprobe_syms),
262 KUNIT_CASE(test_fprobe_data),
263 KUNIT_CASE(test_fprobe_nest),
264 KUNIT_CASE(test_fprobe_skip),
265 {}
266 };
267
268 static struct kunit_suite fprobe_test_suite =
269 .name = "fprobe_test",
270 .init = fprobe_test_init,
271 .test_cases = fprobe_testcases,
272 };
273
274 kunit_test_suites(&fprobe_test_suite);
275
276
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