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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 | /* * test_kprobes.c - simple sanity test for *probes * * Copyright IBM Corp. 2008 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. */ #include <linux/kernel.h> #include <linux/kprobes.h> #include <linux/random.h> #define div_factor 3 static u32 rand1, preh_val, posth_val, jph_val; static int errors, handler_errors, num_tests; static u32 (*target)(u32 value); static u32 (*target2)(u32 value); static noinline u32 kprobe_target(u32 value) { return (value / div_factor); } static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) { preh_val = (rand1 / div_factor); return 0; } static void kp_post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags) { if (preh_val != (rand1 / div_factor)) { handler_errors++; printk(KERN_ERR "Kprobe smoke test failed: " "incorrect value in post_handler\n"); } 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) { printk(KERN_ERR "Kprobe smoke test failed: " "register_kprobe returned %d\n", ret); return ret; } ret = target(rand1); unregister_kprobe(&kp); if (preh_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "kprobe pre_handler not called\n"); handler_errors++; } if (posth_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "kprobe post_handler not called\n"); handler_errors++; } return 0; } 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++; printk(KERN_ERR "Kprobe smoke test failed: " "incorrect value in post_handler2\n"); } 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}; kp.addr = 0; /* addr should be cleard for reusing kprobe. */ ret = register_kprobes(kps, 2); if (ret < 0) { printk(KERN_ERR "Kprobe smoke test failed: " "register_kprobes returned %d\n", ret); return ret; } preh_val = 0; posth_val = 0; ret = target(rand1); if (preh_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "kprobe pre_handler not called\n"); handler_errors++; } if (posth_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "kprobe post_handler not called\n"); handler_errors++; } preh_val = 0; posth_val = 0; ret = target2(rand1); if (preh_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "kprobe pre_handler2 not called\n"); handler_errors++; } if (posth_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "kprobe post_handler2 not called\n"); handler_errors++; } unregister_kprobes(kps, 2); return 0; } static u32 j_kprobe_target(u32 value) { if (value != rand1) { handler_errors++; printk(KERN_ERR "Kprobe smoke test failed: " "incorrect value in jprobe handler\n"); } jph_val = rand1; jprobe_return(); return 0; } static struct jprobe jp = { .entry = j_kprobe_target, .kp.symbol_name = "kprobe_target" }; static int test_jprobe(void) { int ret; ret = register_jprobe(&jp); if (ret < 0) { printk(KERN_ERR "Kprobe smoke test failed: " "register_jprobe returned %d\n", ret); return ret; } ret = target(rand1); unregister_jprobe(&jp); if (jph_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "jprobe handler not called\n"); handler_errors++; } return 0; } static struct jprobe jp2 = { .entry = j_kprobe_target, .kp.symbol_name = "kprobe_target2" }; static int test_jprobes(void) { int ret; struct jprobe *jps[2] = {&jp, &jp2}; jp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */ ret = register_jprobes(jps, 2); if (ret < 0) { printk(KERN_ERR "Kprobe smoke test failed: " "register_jprobes returned %d\n", ret); return ret; } jph_val = 0; ret = target(rand1); if (jph_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "jprobe handler not called\n"); handler_errors++; } jph_val = 0; ret = target2(rand1); if (jph_val == 0) { printk(KERN_ERR "Kprobe smoke test failed: " "jprobe handler2 not called\n"); handler_errors++; } unregister_jprobes(jps, 2); return 0; } #ifdef CONFIG_KRETPROBES static u32 krph_val; static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) { krph_val = (rand1 / div_factor); return 0; } static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) { unsigned long ret = regs_return_value(regs); if (ret != (rand1 / div_factor)) { handler_errors++; printk(KERN_ERR "Kprobe smoke test failed: " "incorrect value in kretprobe handler\n"); } if (krph_val == 0) { handler_errors++; printk(KERN_ERR "Kprobe smoke test failed: " "call to kretprobe entry handler failed\n"); } krph_val = rand1; return 0; } static struct kretprobe rp = { .handler = return_handler, .entry_handler = entry_handler, .kp.symbol_name = "kprobe_target" }; static int test_kretprobe(void) { int ret; ret = register_kretprobe(&rp); if (ret < 0) { printk(KERN_ERR "Kprobe smoke test failed: " "register_kretprobe returned %d\n", ret); return ret; } ret = target(rand1); unregister_kretprobe(&rp); if (krph_val != rand1) { printk(KERN_ERR "Kprobe smoke test failed: " "kretprobe handler not called\n"); handler_errors++; } return 0; } 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++; printk(KERN_ERR "Kprobe smoke test failed: " "incorrect value in kretprobe handler2\n"); } if (krph_val == 0) { handler_errors++; printk(KERN_ERR "Kprobe smoke test failed: " "call to kretprobe entry handler failed\n"); } 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}; rp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */ ret = register_kretprobes(rps, 2); if (ret < 0) { printk(KERN_ERR "Kprobe smoke test failed: " "register_kretprobe returned %d\n", ret); return ret; } krph_val = 0; ret = target(rand1); if (krph_val != rand1) { printk(KERN_ERR "Kprobe smoke test failed: " "kretprobe handler not called\n"); handler_errors++; } krph_val = 0; ret = target2(rand1); if (krph_val != rand1) { printk(KERN_ERR "Kprobe smoke test failed: " "kretprobe handler2 not called\n"); handler_errors++; } unregister_kretprobes(rps, 2); return 0; } #endif /* CONFIG_KRETPROBES */ int init_test_probes(void) { int ret; target = kprobe_target; target2 = kprobe_target2; do { rand1 = random32(); } while (rand1 <= div_factor); printk(KERN_INFO "Kprobe smoke test started\n"); num_tests++; ret = test_kprobe(); if (ret < 0) errors++; num_tests++; ret = test_kprobes(); if (ret < 0) errors++; num_tests++; ret = test_jprobe(); if (ret < 0) errors++; num_tests++; ret = test_jprobes(); if (ret < 0) errors++; #ifdef CONFIG_KRETPROBES num_tests++; ret = test_kretprobe(); if (ret < 0) errors++; num_tests++; ret = test_kretprobes(); if (ret < 0) errors++; #endif /* CONFIG_KRETPROBES */ if (errors) printk(KERN_ERR "BUG: Kprobe smoke test: %d out of " "%d tests failed\n", errors, num_tests); else if (handler_errors) printk(KERN_ERR "BUG: Kprobe smoke test: %d error(s) " "running handlers\n", handler_errors); else printk(KERN_INFO "Kprobe smoke test passed successfully\n"); return 0; } |