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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 | #include <linux/kernel.h> |
18 | #include <linux/kprobes.h> |
19 | #include <linux/random.h> |
20 | |
21 | #define div_factor 3 |
22 | |
23 | static u32 rand1, preh_val, posth_val, jph_val; |
24 | static int errors, handler_errors, num_tests; |
25 | static u32 (*target)(u32 value); |
26 | static u32 (*target2)(u32 value); |
27 | |
28 | static noinline u32 kprobe_target(u32 value) |
29 | { |
30 | return (value / div_factor); |
31 | } |
32 | |
33 | static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) |
34 | { |
35 | preh_val = (rand1 / div_factor); |
36 | return 0; |
37 | } |
38 | |
39 | static 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 | |
50 | static struct kprobe kp = { |
51 | .symbol_name = "kprobe_target", |
52 | .pre_handler = kp_pre_handler, |
53 | .post_handler = kp_post_handler |
54 | }; |
55 | |
56 | static 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 | |
85 | static noinline u32 kprobe_target2(u32 value) |
86 | { |
87 | return (value / div_factor) + 1; |
88 | } |
89 | |
90 | static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs) |
91 | { |
92 | preh_val = (rand1 / div_factor) + 1; |
93 | return 0; |
94 | } |
95 | |
96 | static 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 | |
107 | static struct kprobe kp2 = { |
108 | .symbol_name = "kprobe_target2", |
109 | .pre_handler = kp_pre_handler2, |
110 | .post_handler = kp_post_handler2 |
111 | }; |
112 | |
113 | static int test_kprobes(void) |
114 | { |
115 | int ret; |
116 | struct kprobe *kps[2] = {&kp, &kp2}; |
117 | |
118 | kp.addr = 0; /* addr should be cleard for reusing kprobe. */ |
119 | ret = register_kprobes(kps, 2); |
120 | if (ret < 0) { |
121 | printk(KERN_ERR "Kprobe smoke test failed: " |
122 | "register_kprobes returned %d\n", ret); |
123 | return ret; |
124 | } |
125 | |
126 | preh_val = 0; |
127 | posth_val = 0; |
128 | ret = target(rand1); |
129 | |
130 | if (preh_val == 0) { |
131 | printk(KERN_ERR "Kprobe smoke test failed: " |
132 | "kprobe pre_handler not called\n"); |
133 | handler_errors++; |
134 | } |
135 | |
136 | if (posth_val == 0) { |
137 | printk(KERN_ERR "Kprobe smoke test failed: " |
138 | "kprobe post_handler not called\n"); |
139 | handler_errors++; |
140 | } |
141 | |
142 | preh_val = 0; |
143 | posth_val = 0; |
144 | ret = target2(rand1); |
145 | |
146 | if (preh_val == 0) { |
147 | printk(KERN_ERR "Kprobe smoke test failed: " |
148 | "kprobe pre_handler2 not called\n"); |
149 | handler_errors++; |
150 | } |
151 | |
152 | if (posth_val == 0) { |
153 | printk(KERN_ERR "Kprobe smoke test failed: " |
154 | "kprobe post_handler2 not called\n"); |
155 | handler_errors++; |
156 | } |
157 | |
158 | unregister_kprobes(kps, 2); |
159 | return 0; |
160 | |
161 | } |
162 | |
163 | static u32 j_kprobe_target(u32 value) |
164 | { |
165 | if (value != rand1) { |
166 | handler_errors++; |
167 | printk(KERN_ERR "Kprobe smoke test failed: " |
168 | "incorrect value in jprobe handler\n"); |
169 | } |
170 | |
171 | jph_val = rand1; |
172 | jprobe_return(); |
173 | return 0; |
174 | } |
175 | |
176 | static struct jprobe jp = { |
177 | .entry = j_kprobe_target, |
178 | .kp.symbol_name = "kprobe_target" |
179 | }; |
180 | |
181 | static int test_jprobe(void) |
182 | { |
183 | int ret; |
184 | |
185 | ret = register_jprobe(&jp); |
186 | if (ret < 0) { |
187 | printk(KERN_ERR "Kprobe smoke test failed: " |
188 | "register_jprobe returned %d\n", ret); |
189 | return ret; |
190 | } |
191 | |
192 | ret = target(rand1); |
193 | unregister_jprobe(&jp); |
194 | if (jph_val == 0) { |
195 | printk(KERN_ERR "Kprobe smoke test failed: " |
196 | "jprobe handler not called\n"); |
197 | handler_errors++; |
198 | } |
199 | |
200 | return 0; |
201 | } |
202 | |
203 | static struct jprobe jp2 = { |
204 | .entry = j_kprobe_target, |
205 | .kp.symbol_name = "kprobe_target2" |
206 | }; |
207 | |
208 | static int test_jprobes(void) |
209 | { |
210 | int ret; |
211 | struct jprobe *jps[2] = {&jp, &jp2}; |
212 | |
213 | jp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */ |
214 | ret = register_jprobes(jps, 2); |
215 | if (ret < 0) { |
216 | printk(KERN_ERR "Kprobe smoke test failed: " |
217 | "register_jprobes returned %d\n", ret); |
218 | return ret; |
219 | } |
220 | |
221 | jph_val = 0; |
222 | ret = target(rand1); |
223 | if (jph_val == 0) { |
224 | printk(KERN_ERR "Kprobe smoke test failed: " |
225 | "jprobe handler not called\n"); |
226 | handler_errors++; |
227 | } |
228 | |
229 | jph_val = 0; |
230 | ret = target2(rand1); |
231 | if (jph_val == 0) { |
232 | printk(KERN_ERR "Kprobe smoke test failed: " |
233 | "jprobe handler2 not called\n"); |
234 | handler_errors++; |
235 | } |
236 | unregister_jprobes(jps, 2); |
237 | |
238 | return 0; |
239 | } |
240 | #ifdef CONFIG_KRETPROBES |
241 | static u32 krph_val; |
242 | |
243 | static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) |
244 | { |
245 | krph_val = (rand1 / div_factor); |
246 | return 0; |
247 | } |
248 | |
249 | static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) |
250 | { |
251 | unsigned long ret = regs_return_value(regs); |
252 | |
253 | if (ret != (rand1 / div_factor)) { |
254 | handler_errors++; |
255 | printk(KERN_ERR "Kprobe smoke test failed: " |
256 | "incorrect value in kretprobe handler\n"); |
257 | } |
258 | if (krph_val == 0) { |
259 | handler_errors++; |
260 | printk(KERN_ERR "Kprobe smoke test failed: " |
261 | "call to kretprobe entry handler failed\n"); |
262 | } |
263 | |
264 | krph_val = rand1; |
265 | return 0; |
266 | } |
267 | |
268 | static struct kretprobe rp = { |
269 | .handler = return_handler, |
270 | .entry_handler = entry_handler, |
271 | .kp.symbol_name = "kprobe_target" |
272 | }; |
273 | |
274 | static int test_kretprobe(void) |
275 | { |
276 | int ret; |
277 | |
278 | ret = register_kretprobe(&rp); |
279 | if (ret < 0) { |
280 | printk(KERN_ERR "Kprobe smoke test failed: " |
281 | "register_kretprobe returned %d\n", ret); |
282 | return ret; |
283 | } |
284 | |
285 | ret = target(rand1); |
286 | unregister_kretprobe(&rp); |
287 | if (krph_val != rand1) { |
288 | printk(KERN_ERR "Kprobe smoke test failed: " |
289 | "kretprobe handler not called\n"); |
290 | handler_errors++; |
291 | } |
292 | |
293 | return 0; |
294 | } |
295 | |
296 | static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs) |
297 | { |
298 | unsigned long ret = regs_return_value(regs); |
299 | |
300 | if (ret != (rand1 / div_factor) + 1) { |
301 | handler_errors++; |
302 | printk(KERN_ERR "Kprobe smoke test failed: " |
303 | "incorrect value in kretprobe handler2\n"); |
304 | } |
305 | if (krph_val == 0) { |
306 | handler_errors++; |
307 | printk(KERN_ERR "Kprobe smoke test failed: " |
308 | "call to kretprobe entry handler failed\n"); |
309 | } |
310 | |
311 | krph_val = rand1; |
312 | return 0; |
313 | } |
314 | |
315 | static struct kretprobe rp2 = { |
316 | .handler = return_handler2, |
317 | .entry_handler = entry_handler, |
318 | .kp.symbol_name = "kprobe_target2" |
319 | }; |
320 | |
321 | static int test_kretprobes(void) |
322 | { |
323 | int ret; |
324 | struct kretprobe *rps[2] = {&rp, &rp2}; |
325 | |
326 | rp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */ |
327 | ret = register_kretprobes(rps, 2); |
328 | if (ret < 0) { |
329 | printk(KERN_ERR "Kprobe smoke test failed: " |
330 | "register_kretprobe returned %d\n", ret); |
331 | return ret; |
332 | } |
333 | |
334 | krph_val = 0; |
335 | ret = target(rand1); |
336 | if (krph_val != rand1) { |
337 | printk(KERN_ERR "Kprobe smoke test failed: " |
338 | "kretprobe handler not called\n"); |
339 | handler_errors++; |
340 | } |
341 | |
342 | krph_val = 0; |
343 | ret = target2(rand1); |
344 | if (krph_val != rand1) { |
345 | printk(KERN_ERR "Kprobe smoke test failed: " |
346 | "kretprobe handler2 not called\n"); |
347 | handler_errors++; |
348 | } |
349 | unregister_kretprobes(rps, 2); |
350 | return 0; |
351 | } |
352 | #endif /* CONFIG_KRETPROBES */ |
353 | |
354 | int init_test_probes(void) |
355 | { |
356 | int ret; |
357 | |
358 | target = kprobe_target; |
359 | target2 = kprobe_target2; |
360 | |
361 | do { |
362 | rand1 = random32(); |
363 | } while (rand1 <= div_factor); |
364 | |
365 | printk(KERN_INFO "Kprobe smoke test started\n"); |
366 | num_tests++; |
367 | ret = test_kprobe(); |
368 | if (ret < 0) |
369 | errors++; |
370 | |
371 | num_tests++; |
372 | ret = test_kprobes(); |
373 | if (ret < 0) |
374 | errors++; |
375 | |
376 | num_tests++; |
377 | ret = test_jprobe(); |
378 | if (ret < 0) |
379 | errors++; |
380 | |
381 | num_tests++; |
382 | ret = test_jprobes(); |
383 | if (ret < 0) |
384 | errors++; |
385 | |
386 | #ifdef CONFIG_KRETPROBES |
387 | num_tests++; |
388 | ret = test_kretprobe(); |
389 | if (ret < 0) |
390 | errors++; |
391 | |
392 | num_tests++; |
393 | ret = test_kretprobes(); |
394 | if (ret < 0) |
395 | errors++; |
396 | #endif /* CONFIG_KRETPROBES */ |
397 | |
398 | if (errors) |
399 | printk(KERN_ERR "BUG: Kprobe smoke test: %d out of " |
400 | "%d tests failed\n", errors, num_tests); |
401 | else if (handler_errors) |
402 | printk(KERN_ERR "BUG: Kprobe smoke test: %d error(s) " |
403 | "running handlers\n", handler_errors); |
404 | else |
405 | printk(KERN_INFO "Kprobe smoke test passed successfully\n"); |
406 | |
407 | return 0; |
408 | } |
409 |
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