Blame view
kernel/test_kprobes.c
5.92 KB
7170066ec treewide: Replace... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
8c1c93564 x86: kprobes: add... |
2 3 4 5 |
/* * test_kprobes.c - simple sanity test for *probes * * Copyright IBM Corp. 2008 |
8c1c93564 x86: kprobes: add... |
6 |
*/ |
4878b14b4 kernel/test_kprob... |
7 |
#define pr_fmt(fmt) "Kprobe smoke test: " fmt |
8c1c93564 x86: kprobes: add... |
8 9 10 11 12 |
#include <linux/kernel.h> #include <linux/kprobes.h> #include <linux/random.h> #define div_factor 3 |
2c7d662e2 kprobes: Disable ... |
13 |
static u32 rand1, preh_val, posth_val; |
8c1c93564 x86: kprobes: add... |
14 |
static int errors, handler_errors, num_tests; |
8e1144050 kprobes: indirect... |
15 |
static u32 (*target)(u32 value); |
12da3b888 kprobes: add test... |
16 |
static u32 (*target2)(u32 value); |
8c1c93564 x86: kprobes: add... |
17 18 19 |
static noinline u32 kprobe_target(u32 value) { |
8c1c93564 x86: kprobes: add... |
20 21 22 23 24 |
return (value / div_factor); } static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) { |
3539d0915 kprobes: Improve ... |
25 26 27 28 29 |
if (preemptible()) { handler_errors++; pr_err("pre-handler is preemptible "); } |
8c1c93564 x86: kprobes: add... |
30 31 32 33 34 35 36 |
preh_val = (rand1 / div_factor); return 0; } static void kp_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) { |
3539d0915 kprobes: Improve ... |
37 38 39 40 41 |
if (preemptible()) { handler_errors++; pr_err("post-handler is preemptible "); } |
8c1c93564 x86: kprobes: add... |
42 43 |
if (preh_val != (rand1 / div_factor)) { handler_errors++; |
4878b14b4 kernel/test_kprob... |
44 45 |
pr_err("incorrect value in post_handler "); |
8c1c93564 x86: kprobes: add... |
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
} posth_val = preh_val + div_factor; } static struct kprobe kp = { .symbol_name = "kprobe_target", .pre_handler = kp_pre_handler, .post_handler = kp_post_handler }; static int test_kprobe(void) { int ret; ret = register_kprobe(&kp); if (ret < 0) { |
4878b14b4 kernel/test_kprob... |
62 63 |
pr_err("register_kprobe returned %d ", ret); |
8c1c93564 x86: kprobes: add... |
64 65 |
return ret; } |
8e1144050 kprobes: indirect... |
66 |
ret = target(rand1); |
8c1c93564 x86: kprobes: add... |
67 68 69 |
unregister_kprobe(&kp); if (preh_val == 0) { |
4878b14b4 kernel/test_kprob... |
70 71 |
pr_err("kprobe pre_handler not called "); |
8c1c93564 x86: kprobes: add... |
72 73 74 75 |
handler_errors++; } if (posth_val == 0) { |
4878b14b4 kernel/test_kprob... |
76 77 |
pr_err("kprobe post_handler not called "); |
8c1c93564 x86: kprobes: add... |
78 79 80 81 82 |
handler_errors++; } return 0; } |
12da3b888 kprobes: add test... |
83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 |
static noinline u32 kprobe_target2(u32 value) { return (value / div_factor) + 1; } static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs) { preh_val = (rand1 / div_factor) + 1; return 0; } static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs, unsigned long flags) { if (preh_val != (rand1 / div_factor) + 1) { handler_errors++; |
4878b14b4 kernel/test_kprob... |
99 100 |
pr_err("incorrect value in post_handler2 "); |
12da3b888 kprobes: add test... |
101 102 103 104 105 106 107 108 109 110 111 112 113 114 |
} posth_val = preh_val + div_factor; } static struct kprobe kp2 = { .symbol_name = "kprobe_target2", .pre_handler = kp_pre_handler2, .post_handler = kp_post_handler2 }; static int test_kprobes(void) { int ret; struct kprobe *kps[2] = {&kp, &kp2}; |
fd02e6f7a kprobes: Fix self... |
115 116 117 |
/* addr and flags should be cleard for reusing kprobe. */ kp.addr = NULL; kp.flags = 0; |
12da3b888 kprobes: add test... |
118 119 |
ret = register_kprobes(kps, 2); if (ret < 0) { |
4878b14b4 kernel/test_kprob... |
120 121 |
pr_err("register_kprobes returned %d ", ret); |
12da3b888 kprobes: add test... |
122 123 124 125 126 127 128 129 |
return ret; } preh_val = 0; posth_val = 0; ret = target(rand1); if (preh_val == 0) { |
4878b14b4 kernel/test_kprob... |
130 131 |
pr_err("kprobe pre_handler not called "); |
12da3b888 kprobes: add test... |
132 133 134 135 |
handler_errors++; } if (posth_val == 0) { |
4878b14b4 kernel/test_kprob... |
136 137 |
pr_err("kprobe post_handler not called "); |
12da3b888 kprobes: add test... |
138 139 140 141 142 143 144 145 |
handler_errors++; } preh_val = 0; posth_val = 0; ret = target2(rand1); if (preh_val == 0) { |
4878b14b4 kernel/test_kprob... |
146 147 |
pr_err("kprobe pre_handler2 not called "); |
12da3b888 kprobes: add test... |
148 149 150 151 |
handler_errors++; } if (posth_val == 0) { |
4878b14b4 kernel/test_kprob... |
152 153 |
pr_err("kprobe post_handler2 not called "); |
12da3b888 kprobes: add test... |
154 155 156 157 158 159 160 |
handler_errors++; } unregister_kprobes(kps, 2); return 0; } |
8c1c93564 x86: kprobes: add... |
161 162 |
#ifdef CONFIG_KRETPROBES static u32 krph_val; |
f47cd9b55 kprobes: kretprob... |
163 164 |
static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) { |
3539d0915 kprobes: Improve ... |
165 166 167 168 169 |
if (preemptible()) { handler_errors++; pr_err("kretprobe entry handler is preemptible "); } |
f47cd9b55 kprobes: kretprob... |
170 171 172 |
krph_val = (rand1 / div_factor); return 0; } |
8c1c93564 x86: kprobes: add... |
173 174 175 |
static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) { unsigned long ret = regs_return_value(regs); |
3539d0915 kprobes: Improve ... |
176 177 178 179 180 |
if (preemptible()) { handler_errors++; pr_err("kretprobe return handler is preemptible "); } |
8c1c93564 x86: kprobes: add... |
181 182 |
if (ret != (rand1 / div_factor)) { handler_errors++; |
4878b14b4 kernel/test_kprob... |
183 184 |
pr_err("incorrect value in kretprobe handler "); |
8c1c93564 x86: kprobes: add... |
185 |
} |
f47cd9b55 kprobes: kretprob... |
186 187 |
if (krph_val == 0) { handler_errors++; |
4878b14b4 kernel/test_kprob... |
188 189 |
pr_err("call to kretprobe entry handler failed "); |
f47cd9b55 kprobes: kretprob... |
190 |
} |
8c1c93564 x86: kprobes: add... |
191 |
|
f47cd9b55 kprobes: kretprob... |
192 |
krph_val = rand1; |
8c1c93564 x86: kprobes: add... |
193 194 195 196 197 |
return 0; } static struct kretprobe rp = { .handler = return_handler, |
f47cd9b55 kprobes: kretprob... |
198 |
.entry_handler = entry_handler, |
8c1c93564 x86: kprobes: add... |
199 200 201 202 203 204 205 206 207 |
.kp.symbol_name = "kprobe_target" }; static int test_kretprobe(void) { int ret; ret = register_kretprobe(&rp); if (ret < 0) { |
4878b14b4 kernel/test_kprob... |
208 209 |
pr_err("register_kretprobe returned %d ", ret); |
8c1c93564 x86: kprobes: add... |
210 211 |
return ret; } |
8e1144050 kprobes: indirect... |
212 |
ret = target(rand1); |
8c1c93564 x86: kprobes: add... |
213 |
unregister_kretprobe(&rp); |
f47cd9b55 kprobes: kretprob... |
214 |
if (krph_val != rand1) { |
4878b14b4 kernel/test_kprob... |
215 216 |
pr_err("kretprobe handler not called "); |
8c1c93564 x86: kprobes: add... |
217 218 219 220 221 |
handler_errors++; } return 0; } |
12da3b888 kprobes: add test... |
222 223 224 225 226 227 228 |
static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs) { unsigned long ret = regs_return_value(regs); if (ret != (rand1 / div_factor) + 1) { handler_errors++; |
4878b14b4 kernel/test_kprob... |
229 230 |
pr_err("incorrect value in kretprobe handler2 "); |
12da3b888 kprobes: add test... |
231 232 233 |
} if (krph_val == 0) { handler_errors++; |
4878b14b4 kernel/test_kprob... |
234 235 |
pr_err("call to kretprobe entry handler failed "); |
12da3b888 kprobes: add test... |
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 |
} krph_val = rand1; return 0; } static struct kretprobe rp2 = { .handler = return_handler2, .entry_handler = entry_handler, .kp.symbol_name = "kprobe_target2" }; static int test_kretprobes(void) { int ret; struct kretprobe *rps[2] = {&rp, &rp2}; |
fd02e6f7a kprobes: Fix self... |
252 253 254 |
/* addr and flags should be cleard for reusing kprobe. */ rp.kp.addr = NULL; rp.kp.flags = 0; |
12da3b888 kprobes: add test... |
255 256 |
ret = register_kretprobes(rps, 2); if (ret < 0) { |
4878b14b4 kernel/test_kprob... |
257 258 |
pr_err("register_kretprobe returned %d ", ret); |
12da3b888 kprobes: add test... |
259 260 261 262 263 264 |
return ret; } krph_val = 0; ret = target(rand1); if (krph_val != rand1) { |
4878b14b4 kernel/test_kprob... |
265 266 |
pr_err("kretprobe handler not called "); |
12da3b888 kprobes: add test... |
267 268 269 270 271 272 |
handler_errors++; } krph_val = 0; ret = target2(rand1); if (krph_val != rand1) { |
4878b14b4 kernel/test_kprob... |
273 274 |
pr_err("kretprobe handler2 not called "); |
12da3b888 kprobes: add test... |
275 276 277 278 279 |
handler_errors++; } unregister_kretprobes(rps, 2); return 0; } |
8c1c93564 x86: kprobes: add... |
280 281 282 283 284 |
#endif /* CONFIG_KRETPROBES */ int init_test_probes(void) { int ret; |
8e1144050 kprobes: indirect... |
285 |
target = kprobe_target; |
12da3b888 kprobes: add test... |
286 |
target2 = kprobe_target2; |
8e1144050 kprobes: indirect... |
287 |
|
8c1c93564 x86: kprobes: add... |
288 |
do { |
6d65df332 kernel/: rename r... |
289 |
rand1 = prandom_u32(); |
8c1c93564 x86: kprobes: add... |
290 |
} while (rand1 <= div_factor); |
4878b14b4 kernel/test_kprob... |
291 292 |
pr_info("started "); |
8c1c93564 x86: kprobes: add... |
293 294 295 296 297 298 |
num_tests++; ret = test_kprobe(); if (ret < 0) errors++; num_tests++; |
12da3b888 kprobes: add test... |
299 300 301 |
ret = test_kprobes(); if (ret < 0) errors++; |
8c1c93564 x86: kprobes: add... |
302 303 304 305 306 |
#ifdef CONFIG_KRETPROBES num_tests++; ret = test_kretprobe(); if (ret < 0) errors++; |
12da3b888 kprobes: add test... |
307 308 309 310 311 |
num_tests++; ret = test_kretprobes(); if (ret < 0) errors++; |
8c1c93564 x86: kprobes: add... |
312 313 314 |
#endif /* CONFIG_KRETPROBES */ if (errors) |
4878b14b4 kernel/test_kprob... |
315 316 |
pr_err("BUG: %d out of %d tests failed ", errors, num_tests); |
8c1c93564 x86: kprobes: add... |
317 |
else if (handler_errors) |
4878b14b4 kernel/test_kprob... |
318 319 |
pr_err("BUG: %d error(s) running handlers ", handler_errors); |
8c1c93564 x86: kprobes: add... |
320 |
else |
4878b14b4 kernel/test_kprob... |
321 322 |
pr_info("passed successfully "); |
8c1c93564 x86: kprobes: add... |
323 324 325 |
return 0; } |