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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 | |
25 | static u32 rand1, preh_val, posth_val, jph_val; |
26 | static int errors, handler_errors, num_tests; |
27 | static u32 (*target)(u32 value); |
28 | static u32 (*target2)(u32 value); |
29 | |
30 | static noinline u32 kprobe_target(u32 value) |
31 | { |
32 | return (value / div_factor); |
33 | } |
34 | |
35 | static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) |
36 | { |
37 | preh_val = (rand1 / div_factor); |
38 | return 0; |
39 | } |
40 | |
41 | static 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 | |
51 | static struct kprobe kp = { |
52 | .symbol_name = "kprobe_target", |
53 | .pre_handler = kp_pre_handler, |
54 | .post_handler = kp_post_handler |
55 | }; |
56 | |
57 | static 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 | |
83 | static noinline u32 kprobe_target2(u32 value) |
84 | { |
85 | return (value / div_factor) + 1; |
86 | } |
87 | |
88 | static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs) |
89 | { |
90 | preh_val = (rand1 / div_factor) + 1; |
91 | return 0; |
92 | } |
93 | |
94 | static 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 | |
104 | static struct kprobe kp2 = { |
105 | .symbol_name = "kprobe_target2", |
106 | .pre_handler = kp_pre_handler2, |
107 | .post_handler = kp_post_handler2 |
108 | }; |
109 | |
110 | static 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 | |
157 | static 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 | |
169 | static struct jprobe jp = { |
170 | .entry = j_kprobe_target, |
171 | .kp.symbol_name = "kprobe_target" |
172 | }; |
173 | |
174 | static 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 | |
194 | static struct jprobe jp2 = { |
195 | .entry = j_kprobe_target, |
196 | .kp.symbol_name = "kprobe_target2" |
197 | }; |
198 | |
199 | static 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 |
231 | static u32 krph_val; |
232 | |
233 | static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) |
234 | { |
235 | krph_val = (rand1 / div_factor); |
236 | return 0; |
237 | } |
238 | |
239 | static 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 | |
256 | static struct kretprobe rp = { |
257 | .handler = return_handler, |
258 | .entry_handler = entry_handler, |
259 | .kp.symbol_name = "kprobe_target" |
260 | }; |
261 | |
262 | static 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 | |
282 | static 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 | |
299 | static struct kretprobe rp2 = { |
300 | .handler = return_handler2, |
301 | .entry_handler = entry_handler, |
302 | .kp.symbol_name = "kprobe_target2" |
303 | }; |
304 | |
305 | static 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 | |
337 | int 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 | } |
390 |
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