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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 | /* 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 | |
165 | static 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 | |
178 | static struct jprobe jp = { |
179 | .entry = j_kprobe_target, |
180 | .kp.symbol_name = "kprobe_target" |
181 | }; |
182 | |
183 | static 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 | |
205 | static struct jprobe jp2 = { |
206 | .entry = j_kprobe_target, |
207 | .kp.symbol_name = "kprobe_target2" |
208 | }; |
209 | |
210 | static 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 |
245 | static u32 krph_val; |
246 | |
247 | static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) |
248 | { |
249 | krph_val = (rand1 / div_factor); |
250 | return 0; |
251 | } |
252 | |
253 | static 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 | |
272 | static struct kretprobe rp = { |
273 | .handler = return_handler, |
274 | .entry_handler = entry_handler, |
275 | .kp.symbol_name = "kprobe_target" |
276 | }; |
277 | |
278 | static 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 | |
300 | static 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 | |
319 | static struct kretprobe rp2 = { |
320 | .handler = return_handler2, |
321 | .entry_handler = entry_handler, |
322 | .kp.symbol_name = "kprobe_target2" |
323 | }; |
324 | |
325 | static 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 | |
360 | int init_test_probes(void) |
361 | { |
362 | int ret; |
363 | |
364 | target = kprobe_target; |
365 | target2 = kprobe_target2; |
366 | |
367 | do { |
368 | rand1 = prandom_u32(); |
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 | } |
415 |
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