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1/*
2 * test_kprobes.c - simple sanity test for *probes
3 *
4 * Copyright IBM Corp. 2008
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it would be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 */
16
17#define pr_fmt(fmt) "Kprobe smoke test: " fmt
18
19#include <linux/kernel.h>
20#include <linux/kprobes.h>
21#include <linux/random.h>
22
23#define div_factor 3
24
25static u32 rand1, preh_val, posth_val, jph_val;
26static int errors, handler_errors, num_tests;
27static u32 (*target)(u32 value);
28static u32 (*target2)(u32 value);
29
30static noinline u32 kprobe_target(u32 value)
31{
32 return (value / div_factor);
33}
34
35static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
36{
37 preh_val = (rand1 / div_factor);
38 return 0;
39}
40
41static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
42 unsigned long flags)
43{
44 if (preh_val != (rand1 / div_factor)) {
45 handler_errors++;
46 pr_err("incorrect value in post_handler\n");
47 }
48 posth_val = preh_val + div_factor;
49}
50
51static struct kprobe kp = {
52 .symbol_name = "kprobe_target",
53 .pre_handler = kp_pre_handler,
54 .post_handler = kp_post_handler
55};
56
57static int test_kprobe(void)
58{
59 int ret;
60
61 ret = register_kprobe(&kp);
62 if (ret < 0) {
63 pr_err("register_kprobe returned %d\n", ret);
64 return ret;
65 }
66
67 ret = target(rand1);
68 unregister_kprobe(&kp);
69
70 if (preh_val == 0) {
71 pr_err("kprobe pre_handler not called\n");
72 handler_errors++;
73 }
74
75 if (posth_val == 0) {
76 pr_err("kprobe post_handler not called\n");
77 handler_errors++;
78 }
79
80 return 0;
81}
82
83static noinline u32 kprobe_target2(u32 value)
84{
85 return (value / div_factor) + 1;
86}
87
88static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs)
89{
90 preh_val = (rand1 / div_factor) + 1;
91 return 0;
92}
93
94static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs,
95 unsigned long flags)
96{
97 if (preh_val != (rand1 / div_factor) + 1) {
98 handler_errors++;
99 pr_err("incorrect value in post_handler2\n");
100 }
101 posth_val = preh_val + div_factor;
102}
103
104static struct kprobe kp2 = {
105 .symbol_name = "kprobe_target2",
106 .pre_handler = kp_pre_handler2,
107 .post_handler = kp_post_handler2
108};
109
110static int test_kprobes(void)
111{
112 int ret;
113 struct kprobe *kps[2] = {&kp, &kp2};
114
115 /* addr and flags should be cleard for reusing kprobe. */
116 kp.addr = NULL;
117 kp.flags = 0;
118 ret = register_kprobes(kps, 2);
119 if (ret < 0) {
120 pr_err("register_kprobes returned %d\n", ret);
121 return ret;
122 }
123
124 preh_val = 0;
125 posth_val = 0;
126 ret = target(rand1);
127
128 if (preh_val == 0) {
129 pr_err("kprobe pre_handler not called\n");
130 handler_errors++;
131 }
132
133 if (posth_val == 0) {
134 pr_err("kprobe post_handler not called\n");
135 handler_errors++;
136 }
137
138 preh_val = 0;
139 posth_val = 0;
140 ret = target2(rand1);
141
142 if (preh_val == 0) {
143 pr_err("kprobe pre_handler2 not called\n");
144 handler_errors++;
145 }
146
147 if (posth_val == 0) {
148 pr_err("kprobe post_handler2 not called\n");
149 handler_errors++;
150 }
151
152 unregister_kprobes(kps, 2);
153 return 0;
154
155}
156
157static u32 j_kprobe_target(u32 value)
158{
159 if (value != rand1) {
160 handler_errors++;
161 pr_err("incorrect value in jprobe handler\n");
162 }
163
164 jph_val = rand1;
165 jprobe_return();
166 return 0;
167}
168
169static struct jprobe jp = {
170 .entry = j_kprobe_target,
171 .kp.symbol_name = "kprobe_target"
172};
173
174static int test_jprobe(void)
175{
176 int ret;
177
178 ret = register_jprobe(&jp);
179 if (ret < 0) {
180 pr_err("register_jprobe returned %d\n", ret);
181 return ret;
182 }
183
184 ret = target(rand1);
185 unregister_jprobe(&jp);
186 if (jph_val == 0) {
187 pr_err("jprobe handler not called\n");
188 handler_errors++;
189 }
190
191 return 0;
192}
193
194static struct jprobe jp2 = {
195 .entry = j_kprobe_target,
196 .kp.symbol_name = "kprobe_target2"
197};
198
199static int test_jprobes(void)
200{
201 int ret;
202 struct jprobe *jps[2] = {&jp, &jp2};
203
204 /* addr and flags should be cleard for reusing kprobe. */
205 jp.kp.addr = NULL;
206 jp.kp.flags = 0;
207 ret = register_jprobes(jps, 2);
208 if (ret < 0) {
209 pr_err("register_jprobes returned %d\n", ret);
210 return ret;
211 }
212
213 jph_val = 0;
214 ret = target(rand1);
215 if (jph_val == 0) {
216 pr_err("jprobe handler not called\n");
217 handler_errors++;
218 }
219
220 jph_val = 0;
221 ret = target2(rand1);
222 if (jph_val == 0) {
223 pr_err("jprobe handler2 not called\n");
224 handler_errors++;
225 }
226 unregister_jprobes(jps, 2);
227
228 return 0;
229}
230#ifdef CONFIG_KRETPROBES
231static u32 krph_val;
232
233static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
234{
235 krph_val = (rand1 / div_factor);
236 return 0;
237}
238
239static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
240{
241 unsigned long ret = regs_return_value(regs);
242
243 if (ret != (rand1 / div_factor)) {
244 handler_errors++;
245 pr_err("incorrect value in kretprobe handler\n");
246 }
247 if (krph_val == 0) {
248 handler_errors++;
249 pr_err("call to kretprobe entry handler failed\n");
250 }
251
252 krph_val = rand1;
253 return 0;
254}
255
256static struct kretprobe rp = {
257 .handler = return_handler,
258 .entry_handler = entry_handler,
259 .kp.symbol_name = "kprobe_target"
260};
261
262static int test_kretprobe(void)
263{
264 int ret;
265
266 ret = register_kretprobe(&rp);
267 if (ret < 0) {
268 pr_err("register_kretprobe returned %d\n", ret);
269 return ret;
270 }
271
272 ret = target(rand1);
273 unregister_kretprobe(&rp);
274 if (krph_val != rand1) {
275 pr_err("kretprobe handler not called\n");
276 handler_errors++;
277 }
278
279 return 0;
280}
281
282static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs)
283{
284 unsigned long ret = regs_return_value(regs);
285
286 if (ret != (rand1 / div_factor) + 1) {
287 handler_errors++;
288 pr_err("incorrect value in kretprobe handler2\n");
289 }
290 if (krph_val == 0) {
291 handler_errors++;
292 pr_err("call to kretprobe entry handler failed\n");
293 }
294
295 krph_val = rand1;
296 return 0;
297}
298
299static struct kretprobe rp2 = {
300 .handler = return_handler2,
301 .entry_handler = entry_handler,
302 .kp.symbol_name = "kprobe_target2"
303};
304
305static int test_kretprobes(void)
306{
307 int ret;
308 struct kretprobe *rps[2] = {&rp, &rp2};
309
310 /* addr and flags should be cleard for reusing kprobe. */
311 rp.kp.addr = NULL;
312 rp.kp.flags = 0;
313 ret = register_kretprobes(rps, 2);
314 if (ret < 0) {
315 pr_err("register_kretprobe returned %d\n", ret);
316 return ret;
317 }
318
319 krph_val = 0;
320 ret = target(rand1);
321 if (krph_val != rand1) {
322 pr_err("kretprobe handler not called\n");
323 handler_errors++;
324 }
325
326 krph_val = 0;
327 ret = target2(rand1);
328 if (krph_val != rand1) {
329 pr_err("kretprobe handler2 not called\n");
330 handler_errors++;
331 }
332 unregister_kretprobes(rps, 2);
333 return 0;
334}
335#endif /* CONFIG_KRETPROBES */
336
337int init_test_probes(void)
338{
339 int ret;
340
341 target = kprobe_target;
342 target2 = kprobe_target2;
343
344 do {
345 rand1 = prandom_u32();
346 } while (rand1 <= div_factor);
347
348 pr_info("started\n");
349 num_tests++;
350 ret = test_kprobe();
351 if (ret < 0)
352 errors++;
353
354 num_tests++;
355 ret = test_kprobes();
356 if (ret < 0)
357 errors++;
358
359 num_tests++;
360 ret = test_jprobe();
361 if (ret < 0)
362 errors++;
363
364 num_tests++;
365 ret = test_jprobes();
366 if (ret < 0)
367 errors++;
368
369#ifdef CONFIG_KRETPROBES
370 num_tests++;
371 ret = test_kretprobe();
372 if (ret < 0)
373 errors++;
374
375 num_tests++;
376 ret = test_kretprobes();
377 if (ret < 0)
378 errors++;
379#endif /* CONFIG_KRETPROBES */
380
381 if (errors)
382 pr_err("BUG: %d out of %d tests failed\n", errors, num_tests);
383 else if (handler_errors)
384 pr_err("BUG: %d error(s) running handlers\n", handler_errors);
385 else
386 pr_info("passed successfully\n");
387
388 return 0;
389}
1/*
2 * test_kprobes.c - simple sanity test for *probes
3 *
4 * Copyright IBM Corp. 2008
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it would be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 */
16
17#include <linux/kernel.h>
18#include <linux/kprobes.h>
19#include <linux/random.h>
20
21#define div_factor 3
22
23static u32 rand1, preh_val, posth_val, jph_val;
24static int errors, handler_errors, num_tests;
25static u32 (*target)(u32 value);
26static u32 (*target2)(u32 value);
27
28static noinline u32 kprobe_target(u32 value)
29{
30 return (value / div_factor);
31}
32
33static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
34{
35 preh_val = (rand1 / div_factor);
36 return 0;
37}
38
39static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
40 unsigned long flags)
41{
42 if (preh_val != (rand1 / div_factor)) {
43 handler_errors++;
44 printk(KERN_ERR "Kprobe smoke test failed: "
45 "incorrect value in post_handler\n");
46 }
47 posth_val = preh_val + div_factor;
48}
49
50static struct kprobe kp = {
51 .symbol_name = "kprobe_target",
52 .pre_handler = kp_pre_handler,
53 .post_handler = kp_post_handler
54};
55
56static int test_kprobe(void)
57{
58 int ret;
59
60 ret = register_kprobe(&kp);
61 if (ret < 0) {
62 printk(KERN_ERR "Kprobe smoke test failed: "
63 "register_kprobe returned %d\n", ret);
64 return ret;
65 }
66
67 ret = target(rand1);
68 unregister_kprobe(&kp);
69
70 if (preh_val == 0) {
71 printk(KERN_ERR "Kprobe smoke test failed: "
72 "kprobe pre_handler not called\n");
73 handler_errors++;
74 }
75
76 if (posth_val == 0) {
77 printk(KERN_ERR "Kprobe smoke test failed: "
78 "kprobe post_handler not called\n");
79 handler_errors++;
80 }
81
82 return 0;
83}
84
85static noinline u32 kprobe_target2(u32 value)
86{
87 return (value / div_factor) + 1;
88}
89
90static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs)
91{
92 preh_val = (rand1 / div_factor) + 1;
93 return 0;
94}
95
96static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs,
97 unsigned long flags)
98{
99 if (preh_val != (rand1 / div_factor) + 1) {
100 handler_errors++;
101 printk(KERN_ERR "Kprobe smoke test failed: "
102 "incorrect value in post_handler2\n");
103 }
104 posth_val = preh_val + div_factor;
105}
106
107static struct kprobe kp2 = {
108 .symbol_name = "kprobe_target2",
109 .pre_handler = kp_pre_handler2,
110 .post_handler = kp_post_handler2
111};
112
113static int test_kprobes(void)
114{
115 int ret;
116 struct kprobe *kps[2] = {&kp, &kp2};
117
118 /* addr and flags should be cleard for reusing kprobe. */
119 kp.addr = NULL;
120 kp.flags = 0;
121 ret = register_kprobes(kps, 2);
122 if (ret < 0) {
123 printk(KERN_ERR "Kprobe smoke test failed: "
124 "register_kprobes returned %d\n", ret);
125 return ret;
126 }
127
128 preh_val = 0;
129 posth_val = 0;
130 ret = target(rand1);
131
132 if (preh_val == 0) {
133 printk(KERN_ERR "Kprobe smoke test failed: "
134 "kprobe pre_handler not called\n");
135 handler_errors++;
136 }
137
138 if (posth_val == 0) {
139 printk(KERN_ERR "Kprobe smoke test failed: "
140 "kprobe post_handler not called\n");
141 handler_errors++;
142 }
143
144 preh_val = 0;
145 posth_val = 0;
146 ret = target2(rand1);
147
148 if (preh_val == 0) {
149 printk(KERN_ERR "Kprobe smoke test failed: "
150 "kprobe pre_handler2 not called\n");
151 handler_errors++;
152 }
153
154 if (posth_val == 0) {
155 printk(KERN_ERR "Kprobe smoke test failed: "
156 "kprobe post_handler2 not called\n");
157 handler_errors++;
158 }
159
160 unregister_kprobes(kps, 2);
161 return 0;
162
163}
164
165static u32 j_kprobe_target(u32 value)
166{
167 if (value != rand1) {
168 handler_errors++;
169 printk(KERN_ERR "Kprobe smoke test failed: "
170 "incorrect value in jprobe handler\n");
171 }
172
173 jph_val = rand1;
174 jprobe_return();
175 return 0;
176}
177
178static struct jprobe jp = {
179 .entry = j_kprobe_target,
180 .kp.symbol_name = "kprobe_target"
181};
182
183static int test_jprobe(void)
184{
185 int ret;
186
187 ret = register_jprobe(&jp);
188 if (ret < 0) {
189 printk(KERN_ERR "Kprobe smoke test failed: "
190 "register_jprobe returned %d\n", ret);
191 return ret;
192 }
193
194 ret = target(rand1);
195 unregister_jprobe(&jp);
196 if (jph_val == 0) {
197 printk(KERN_ERR "Kprobe smoke test failed: "
198 "jprobe handler not called\n");
199 handler_errors++;
200 }
201
202 return 0;
203}
204
205static struct jprobe jp2 = {
206 .entry = j_kprobe_target,
207 .kp.symbol_name = "kprobe_target2"
208};
209
210static int test_jprobes(void)
211{
212 int ret;
213 struct jprobe *jps[2] = {&jp, &jp2};
214
215 /* addr and flags should be cleard for reusing kprobe. */
216 jp.kp.addr = NULL;
217 jp.kp.flags = 0;
218 ret = register_jprobes(jps, 2);
219 if (ret < 0) {
220 printk(KERN_ERR "Kprobe smoke test failed: "
221 "register_jprobes returned %d\n", ret);
222 return ret;
223 }
224
225 jph_val = 0;
226 ret = target(rand1);
227 if (jph_val == 0) {
228 printk(KERN_ERR "Kprobe smoke test failed: "
229 "jprobe handler not called\n");
230 handler_errors++;
231 }
232
233 jph_val = 0;
234 ret = target2(rand1);
235 if (jph_val == 0) {
236 printk(KERN_ERR "Kprobe smoke test failed: "
237 "jprobe handler2 not called\n");
238 handler_errors++;
239 }
240 unregister_jprobes(jps, 2);
241
242 return 0;
243}
244#ifdef CONFIG_KRETPROBES
245static u32 krph_val;
246
247static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
248{
249 krph_val = (rand1 / div_factor);
250 return 0;
251}
252
253static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
254{
255 unsigned long ret = regs_return_value(regs);
256
257 if (ret != (rand1 / div_factor)) {
258 handler_errors++;
259 printk(KERN_ERR "Kprobe smoke test failed: "
260 "incorrect value in kretprobe handler\n");
261 }
262 if (krph_val == 0) {
263 handler_errors++;
264 printk(KERN_ERR "Kprobe smoke test failed: "
265 "call to kretprobe entry handler failed\n");
266 }
267
268 krph_val = rand1;
269 return 0;
270}
271
272static struct kretprobe rp = {
273 .handler = return_handler,
274 .entry_handler = entry_handler,
275 .kp.symbol_name = "kprobe_target"
276};
277
278static int test_kretprobe(void)
279{
280 int ret;
281
282 ret = register_kretprobe(&rp);
283 if (ret < 0) {
284 printk(KERN_ERR "Kprobe smoke test failed: "
285 "register_kretprobe returned %d\n", ret);
286 return ret;
287 }
288
289 ret = target(rand1);
290 unregister_kretprobe(&rp);
291 if (krph_val != rand1) {
292 printk(KERN_ERR "Kprobe smoke test failed: "
293 "kretprobe handler not called\n");
294 handler_errors++;
295 }
296
297 return 0;
298}
299
300static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs)
301{
302 unsigned long ret = regs_return_value(regs);
303
304 if (ret != (rand1 / div_factor) + 1) {
305 handler_errors++;
306 printk(KERN_ERR "Kprobe smoke test failed: "
307 "incorrect value in kretprobe handler2\n");
308 }
309 if (krph_val == 0) {
310 handler_errors++;
311 printk(KERN_ERR "Kprobe smoke test failed: "
312 "call to kretprobe entry handler failed\n");
313 }
314
315 krph_val = rand1;
316 return 0;
317}
318
319static struct kretprobe rp2 = {
320 .handler = return_handler2,
321 .entry_handler = entry_handler,
322 .kp.symbol_name = "kprobe_target2"
323};
324
325static int test_kretprobes(void)
326{
327 int ret;
328 struct kretprobe *rps[2] = {&rp, &rp2};
329
330 /* addr and flags should be cleard for reusing kprobe. */
331 rp.kp.addr = NULL;
332 rp.kp.flags = 0;
333 ret = register_kretprobes(rps, 2);
334 if (ret < 0) {
335 printk(KERN_ERR "Kprobe smoke test failed: "
336 "register_kretprobe returned %d\n", ret);
337 return ret;
338 }
339
340 krph_val = 0;
341 ret = target(rand1);
342 if (krph_val != rand1) {
343 printk(KERN_ERR "Kprobe smoke test failed: "
344 "kretprobe handler not called\n");
345 handler_errors++;
346 }
347
348 krph_val = 0;
349 ret = target2(rand1);
350 if (krph_val != rand1) {
351 printk(KERN_ERR "Kprobe smoke test failed: "
352 "kretprobe handler2 not called\n");
353 handler_errors++;
354 }
355 unregister_kretprobes(rps, 2);
356 return 0;
357}
358#endif /* CONFIG_KRETPROBES */
359
360int init_test_probes(void)
361{
362 int ret;
363
364 target = kprobe_target;
365 target2 = kprobe_target2;
366
367 do {
368 rand1 = random32();
369 } while (rand1 <= div_factor);
370
371 printk(KERN_INFO "Kprobe smoke test started\n");
372 num_tests++;
373 ret = test_kprobe();
374 if (ret < 0)
375 errors++;
376
377 num_tests++;
378 ret = test_kprobes();
379 if (ret < 0)
380 errors++;
381
382 num_tests++;
383 ret = test_jprobe();
384 if (ret < 0)
385 errors++;
386
387 num_tests++;
388 ret = test_jprobes();
389 if (ret < 0)
390 errors++;
391
392#ifdef CONFIG_KRETPROBES
393 num_tests++;
394 ret = test_kretprobe();
395 if (ret < 0)
396 errors++;
397
398 num_tests++;
399 ret = test_kretprobes();
400 if (ret < 0)
401 errors++;
402#endif /* CONFIG_KRETPROBES */
403
404 if (errors)
405 printk(KERN_ERR "BUG: Kprobe smoke test: %d out of "
406 "%d tests failed\n", errors, num_tests);
407 else if (handler_errors)
408 printk(KERN_ERR "BUG: Kprobe smoke test: %d error(s) "
409 "running handlers\n", handler_errors);
410 else
411 printk(KERN_INFO "Kprobe smoke test passed successfully\n");
412
413 return 0;
414}