To update vsperf/packet-forwarding configuration files
[kvmfornfv.git] / kernel / kernel / test_kprobes.c
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 }