Blame view
lib/test_overflow.c
22.3 KB
455a35a6c lib: add runtime ... |
1 2 3 4 5 |
// SPDX-License-Identifier: GPL-2.0 OR MIT /* * Test cases for arithmetic overflow checks. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
ca90800a9 test_overflow: Ad... |
6 |
#include <linux/device.h> |
455a35a6c lib: add runtime ... |
7 8 |
#include <linux/init.h> #include <linux/kernel.h> |
ca90800a9 test_overflow: Ad... |
9 |
#include <linux/mm.h> |
455a35a6c lib: add runtime ... |
10 11 |
#include <linux/module.h> #include <linux/overflow.h> |
ca90800a9 test_overflow: Ad... |
12 |
#include <linux/slab.h> |
455a35a6c lib: add runtime ... |
13 |
#include <linux/types.h> |
ca90800a9 test_overflow: Ad... |
14 |
#include <linux/vmalloc.h> |
455a35a6c lib: add runtime ... |
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 |
#define DEFINE_TEST_ARRAY(t) \ static const struct test_ ## t { \ t a, b; \ t sum, diff, prod; \ bool s_of, d_of, p_of; \ } t ## _tests[] __initconst DEFINE_TEST_ARRAY(u8) = { {0, 0, 0, 0, 0, false, false, false}, {1, 1, 2, 0, 1, false, false, false}, {0, 1, 1, U8_MAX, 0, false, true, false}, {1, 0, 1, 1, 0, false, false, false}, {0, U8_MAX, U8_MAX, 1, 0, false, true, false}, {U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false}, {1, U8_MAX, 0, 2, U8_MAX, true, true, false}, {U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false}, {U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true}, {U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true}, {U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true}, {1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false}, {1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true}, {1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false}, {1U << 7, 1U << 7, 0, 0, 0, true, false, true}, {48, 32, 80, 16, 0, false, false, true}, {128, 128, 0, 0, 0, true, false, true}, {123, 234, 101, 145, 110, true, true, true}, }; DEFINE_TEST_ARRAY(u16) = { {0, 0, 0, 0, 0, false, false, false}, {1, 1, 2, 0, 1, false, false, false}, {0, 1, 1, U16_MAX, 0, false, true, false}, {1, 0, 1, 1, 0, false, false, false}, {0, U16_MAX, U16_MAX, 1, 0, false, true, false}, {U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false}, {1, U16_MAX, 0, 2, U16_MAX, true, true, false}, {U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false}, {U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true}, {U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true}, {U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true}, {1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false}, {1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true}, {1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false}, {1U << 15, 1U << 15, 0, 0, 0, true, false, true}, {123, 234, 357, 65425, 28782, false, true, false}, {1234, 2345, 3579, 64425, 10146, false, true, true}, }; DEFINE_TEST_ARRAY(u32) = { {0, 0, 0, 0, 0, false, false, false}, {1, 1, 2, 0, 1, false, false, false}, {0, 1, 1, U32_MAX, 0, false, true, false}, {1, 0, 1, 1, 0, false, false, false}, {0, U32_MAX, U32_MAX, 1, 0, false, true, false}, {U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false}, {1, U32_MAX, 0, 2, U32_MAX, true, true, false}, {U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false}, {U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true}, {U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true}, {U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true}, {1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false}, {1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true}, {1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false}, {1U << 31, 1U << 31, 0, 0, 0, true, false, true}, {-2U, 1U, -1U, -3U, -2U, false, false, false}, {-4U, 5U, 1U, -9U, -20U, true, false, true}, }; DEFINE_TEST_ARRAY(u64) = { {0, 0, 0, 0, 0, false, false, false}, {1, 1, 2, 0, 1, false, false, false}, {0, 1, 1, U64_MAX, 0, false, true, false}, {1, 0, 1, 1, 0, false, false, false}, {0, U64_MAX, U64_MAX, 1, 0, false, true, false}, {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false}, {1, U64_MAX, 0, 2, U64_MAX, true, true, false}, {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false}, {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true}, {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true}, {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true}, {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false}, {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true}, {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false}, {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true}, {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */, 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL, false, true, false}, {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true}, }; DEFINE_TEST_ARRAY(s8) = { {0, 0, 0, 0, 0, false, false, false}, {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false}, {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false}, {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false}, {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false}, {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true}, {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true}, {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false}, {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false}, {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false}, {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false}, {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false}, {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false}, {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false}, {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false}, {S8_MIN, S8_MIN, 0, 0, 0, true, false, true}, {S8_MAX, S8_MAX, -2, 0, 1, true, false, true}, {-4, -32, -36, 28, -128, false, false, true}, {-4, 32, 28, -36, -128, false, false, false}, }; DEFINE_TEST_ARRAY(s16) = { {0, 0, 0, 0, 0, false, false, false}, {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false}, {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false}, {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false}, {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false}, {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true}, {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true}, {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false}, {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false}, {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false}, {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false}, {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false}, {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false}, {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false}, {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false}, {S16_MIN, S16_MIN, 0, 0, 0, true, false, true}, {S16_MAX, S16_MAX, -2, 0, 1, true, false, true}, }; DEFINE_TEST_ARRAY(s32) = { {0, 0, 0, 0, 0, false, false, false}, {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false}, {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false}, {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false}, {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false}, {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true}, {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true}, {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false}, {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false}, {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false}, {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false}, {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false}, {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false}, {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false}, {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false}, {S32_MIN, S32_MIN, 0, 0, 0, true, false, true}, {S32_MAX, S32_MAX, -2, 0, 1, true, false, true}, }; DEFINE_TEST_ARRAY(s64) = { {0, 0, 0, 0, 0, false, false, false}, {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false}, {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false}, {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false}, {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false}, {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true}, {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true}, {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false}, {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false}, {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false}, {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false}, {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false}, {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false}, {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false}, {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false}, {S64_MIN, S64_MIN, 0, 0, 0, true, false, true}, {S64_MAX, S64_MAX, -2, 0, 1, true, false, true}, {-1, -1, -2, 0, 1, false, false, false}, {-1, -128, -129, 127, 128, false, false, false}, {-128, -1, -129, -127, 128, false, false, false}, {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, }; |
6d3344324 test_overflow: ma... |
216 217 218 219 220 221 222 223 224 225 |
#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ t _r; \ bool _of; \ \ _of = check_ ## op ## _overflow(a, b, &_r); \ if (_of != of) { \ pr_warn("expected "fmt" "sym" "fmt \ " to%s overflow (type %s) ", \ a, b, of ? "" : " not", #t); \ |
8fee81aa4 test_overflow: Re... |
226 |
err = 1; \ |
6d3344324 test_overflow: ma... |
227 228 229 230 231 232 |
} \ if (_r != r) { \ pr_warn("expected "fmt" "sym" "fmt" == " \ fmt", got "fmt" (type %s) ", \ a, b, r, _r, #t); \ |
8fee81aa4 test_overflow: Re... |
233 |
err = 1; \ |
6d3344324 test_overflow: ma... |
234 235 |
} \ } while (0) |
455a35a6c lib: add runtime ... |
236 |
#define DEFINE_TEST_FUNC(t, fmt) \ |
8fee81aa4 test_overflow: Re... |
237 |
static int __init do_test_ ## t(const struct test_ ## t *p) \ |
455a35a6c lib: add runtime ... |
238 |
{ \ |
8fee81aa4 test_overflow: Re... |
239 240 |
int err = 0; \ \ |
6d3344324 test_overflow: ma... |
241 242 243 244 245 |
check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ |
8fee81aa4 test_overflow: Re... |
246 247 |
\ return err; \ |
455a35a6c lib: add runtime ... |
248 249 |
} \ \ |
8fee81aa4 test_overflow: Re... |
250 251 |
static int __init test_ ## t ## _overflow(void) { \ int err = 0; \ |
455a35a6c lib: add runtime ... |
252 253 |
unsigned i; \ \ |
d36b6ad27 test_overflow: Ad... |
254 255 256 |
pr_info("%-3s: %zu arithmetic tests ", #t, \ ARRAY_SIZE(t ## _tests)); \ |
455a35a6c lib: add runtime ... |
257 |
for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ |
8fee81aa4 test_overflow: Re... |
258 259 |
err |= do_test_ ## t(&t ## _tests[i]); \ return err; \ |
455a35a6c lib: add runtime ... |
260 261 262 263 264 265 266 267 268 269 270 271 |
} DEFINE_TEST_FUNC(u8, "%d"); DEFINE_TEST_FUNC(s8, "%d"); DEFINE_TEST_FUNC(u16, "%d"); DEFINE_TEST_FUNC(s16, "%d"); DEFINE_TEST_FUNC(u32, "%u"); DEFINE_TEST_FUNC(s32, "%d"); #if BITS_PER_LONG == 64 DEFINE_TEST_FUNC(u64, "%llu"); DEFINE_TEST_FUNC(s64, "%lld"); #endif |
8fee81aa4 test_overflow: Re... |
272 |
static int __init test_overflow_calculation(void) |
455a35a6c lib: add runtime ... |
273 |
{ |
8fee81aa4 test_overflow: Re... |
274 275 276 277 278 279 280 281 |
int err = 0; err |= test_u8_overflow(); err |= test_s8_overflow(); err |= test_u16_overflow(); err |= test_s16_overflow(); err |= test_u32_overflow(); err |= test_s32_overflow(); |
455a35a6c lib: add runtime ... |
282 |
#if BITS_PER_LONG == 64 |
8fee81aa4 test_overflow: Re... |
283 284 |
err |= test_u64_overflow(); err |= test_s64_overflow(); |
455a35a6c lib: add runtime ... |
285 |
#endif |
8fee81aa4 test_overflow: Re... |
286 287 |
return err; } |
d36b6ad27 test_overflow: Ad... |
288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 |
static int __init test_overflow_shift(void) { int err = 0; /* Args are: value, shift, type, expected result, overflow expected */ #define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \ int __failed = 0; \ typeof(a) __a = (a); \ typeof(s) __s = (s); \ t __e = (expect); \ t __d; \ bool __of = check_shl_overflow(__a, __s, &__d); \ if (__of != of) { \ pr_warn("expected (%s)(%s << %s) to%s overflow ", \ #t, #a, #s, of ? "" : " not"); \ __failed = 1; \ } else if (!__of && __d != __e) { \ pr_warn("expected (%s)(%s << %s) == %s ", \ #t, #a, #s, #expect); \ if ((t)-1 < 0) \ pr_warn("got %lld ", (s64)__d); \ else \ pr_warn("got %llu ", (u64)__d); \ __failed = 1; \ } \ if (!__failed) \ pr_info("ok: (%s)(%s << %s) == %s ", #t, #a, #s, \ of ? "overflow" : #expect); \ __failed; \ }) /* Sane shifts. */ err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); /* Sane shift: start and end with 0, without a too-wide shift. */ err |= TEST_ONE_SHIFT(0, 7, u8, 0, false); err |= TEST_ONE_SHIFT(0, 15, u16, 0, false); err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); err |= TEST_ONE_SHIFT(0, 31, u32, 0, false); err |= TEST_ONE_SHIFT(0, 63, u64, 0, false); /* Sane shift: start and end with 0, without reaching signed bit. */ err |= TEST_ONE_SHIFT(0, 6, s8, 0, false); err |= TEST_ONE_SHIFT(0, 14, s16, 0, false); err |= TEST_ONE_SHIFT(0, 30, int, 0, false); err |= TEST_ONE_SHIFT(0, 30, s32, 0, false); err |= TEST_ONE_SHIFT(0, 62, s64, 0, false); /* Overflow: shifted the bit off the end. */ err |= TEST_ONE_SHIFT(1, 8, u8, 0, true); err |= TEST_ONE_SHIFT(1, 16, u16, 0, true); err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); err |= TEST_ONE_SHIFT(1, 32, u32, 0, true); err |= TEST_ONE_SHIFT(1, 64, u64, 0, true); /* Overflow: shifted into the signed bit. */ err |= TEST_ONE_SHIFT(1, 7, s8, 0, true); err |= TEST_ONE_SHIFT(1, 15, s16, 0, true); err |= TEST_ONE_SHIFT(1, 31, int, 0, true); err |= TEST_ONE_SHIFT(1, 31, s32, 0, true); err |= TEST_ONE_SHIFT(1, 63, s64, 0, true); /* Overflow: high bit falls off unsigned types. */ /* 10010110 */ err |= TEST_ONE_SHIFT(150, 1, u8, 0, true); /* 1000100010010110 */ err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true); /* 10000100000010001000100010010110 */ err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); /* 1000001000010000010000000100000010000100000010001000100010010110 */ err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); /* Overflow: bit shifted into signed bit on signed types. */ /* 01001011 */ err |= TEST_ONE_SHIFT(75, 1, s8, 0, true); /* 0100010001001011 */ err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true); /* 01000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true); /* 0100000100001000001000000010000001000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); /* Overflow: bit shifted past signed bit on signed types. */ /* 01001011 */ err |= TEST_ONE_SHIFT(75, 2, s8, 0, true); /* 0100010001001011 */ err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true); /* 01000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true); /* 0100000100001000001000000010000001000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); /* Overflow: values larger than destination type. */ err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true); err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); /* Nonsense: negative initial value. */ err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true); err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true); err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true); err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true); err |= TEST_ONE_SHIFT(-10, 0, int, 0, true); err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true); err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true); err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true); err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true); /* Nonsense: negative shift values. */ err |= TEST_ONE_SHIFT(0, -5, s8, 0, true); err |= TEST_ONE_SHIFT(0, -5, u8, 0, true); err |= TEST_ONE_SHIFT(0, -10, s16, 0, true); err |= TEST_ONE_SHIFT(0, -10, u16, 0, true); err |= TEST_ONE_SHIFT(0, -15, int, 0, true); err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); err |= TEST_ONE_SHIFT(0, -20, s32, 0, true); err |= TEST_ONE_SHIFT(0, -20, u32, 0, true); err |= TEST_ONE_SHIFT(0, -30, s64, 0, true); err |= TEST_ONE_SHIFT(0, -30, u64, 0, true); /* Overflow: shifted at or beyond entire type's bit width. */ err |= TEST_ONE_SHIFT(0, 8, u8, 0, true); err |= TEST_ONE_SHIFT(0, 9, u8, 0, true); err |= TEST_ONE_SHIFT(0, 8, s8, 0, true); err |= TEST_ONE_SHIFT(0, 9, s8, 0, true); err |= TEST_ONE_SHIFT(0, 16, u16, 0, true); err |= TEST_ONE_SHIFT(0, 17, u16, 0, true); err |= TEST_ONE_SHIFT(0, 16, s16, 0, true); err |= TEST_ONE_SHIFT(0, 17, s16, 0, true); err |= TEST_ONE_SHIFT(0, 32, u32, 0, true); err |= TEST_ONE_SHIFT(0, 33, u32, 0, true); err |= TEST_ONE_SHIFT(0, 32, int, 0, true); err |= TEST_ONE_SHIFT(0, 33, int, 0, true); err |= TEST_ONE_SHIFT(0, 32, s32, 0, true); err |= TEST_ONE_SHIFT(0, 33, s32, 0, true); err |= TEST_ONE_SHIFT(0, 64, u64, 0, true); err |= TEST_ONE_SHIFT(0, 65, u64, 0, true); err |= TEST_ONE_SHIFT(0, 64, s64, 0, true); err |= TEST_ONE_SHIFT(0, 65, s64, 0, true); /* * Corner case: for unsigned types, we fail when we've shifted * through the entire width of bits. For signed types, we might * want to match this behavior, but that would mean noticing if * we shift through all but the signed bit, and this is not * currently detected (but we'll notice an overflow into the * signed bit). So, for now, we will test this condition but * mark it as not expected to overflow. */ err |= TEST_ONE_SHIFT(0, 7, s8, 0, false); err |= TEST_ONE_SHIFT(0, 15, s16, 0, false); err |= TEST_ONE_SHIFT(0, 31, int, 0, false); err |= TEST_ONE_SHIFT(0, 31, s32, 0, false); err |= TEST_ONE_SHIFT(0, 63, s64, 0, false); return err; } |
ca90800a9 test_overflow: Ad... |
486 487 488 489 |
/* * Deal with the various forms of allocator arguments. See comments above * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". */ |
8e060c21a lib/test_overflow... |
490 491 492 |
#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) #define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) #define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE) |
ca90800a9 test_overflow: Ad... |
493 494 |
#define alloc000(alloc, arg, sz) alloc(sz) #define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) |
8e060c21a lib/test_overflow... |
495 |
#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP) |
ca90800a9 test_overflow: Ad... |
496 497 |
#define free0(free, arg, ptr) free(ptr) #define free1(free, arg, ptr) free(arg, ptr) |
8e060c21a lib/test_overflow... |
498 499 |
/* Wrap around to 16K */ #define TEST_SIZE (5 * 4096) |
ca90800a9 test_overflow: Ad... |
500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 |
#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ static int __init test_ ## func (void *arg) \ { \ volatile size_t a = TEST_SIZE; \ volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ void *ptr; \ \ /* Tiny allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ if (!ptr) { \ pr_warn(#func " failed regular allocation?! "); \ return 1; \ } \ free ## want_arg (free_func, arg, ptr); \ \ /* Wrapped allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ a * b); \ if (!ptr) { \ pr_warn(#func " unexpectedly failed bad wrapping?! "); \ return 1; \ } \ free ## want_arg (free_func, arg, ptr); \ \ /* Saturated allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ array_size(a, b)); \ if (ptr) { \ pr_warn(#func " missed saturation! "); \ free ## want_arg (free_func, arg, ptr); \ return 1; \ } \ pr_info(#func " detected saturation "); \ return 0; \ } /* * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node()) * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc()) * Allocator uses a special leading argument + | | (e.g. devm_kmalloc()) * | | | */ DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0); DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1); DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0); DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1); DEFINE_TEST_ALLOC(vmalloc, vfree, 0, 0, 0); DEFINE_TEST_ALLOC(vmalloc_node, vfree, 0, 0, 1); DEFINE_TEST_ALLOC(vzalloc, vfree, 0, 0, 0); DEFINE_TEST_ALLOC(vzalloc_node, vfree, 0, 0, 1); DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0); DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1); DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0); DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); static int __init test_overflow_allocation(void) { const char device_name[] = "overflow-test"; struct device *dev; int err = 0; /* Create dummy device for devm_kmalloc()-family tests. */ dev = root_device_register(device_name); |
8958fd411 test_overflow: fi... |
570 |
if (IS_ERR(dev)) { |
ca90800a9 test_overflow: Ad... |
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 |
pr_warn("Cannot register test device "); return 1; } err |= test_kmalloc(NULL); err |= test_kmalloc_node(NULL); err |= test_kzalloc(NULL); err |= test_kzalloc_node(NULL); err |= test_kvmalloc(NULL); err |= test_kvmalloc_node(NULL); err |= test_kvzalloc(NULL); err |= test_kvzalloc_node(NULL); err |= test_vmalloc(NULL); err |= test_vmalloc_node(NULL); err |= test_vzalloc(NULL); err |= test_vzalloc_node(NULL); err |= test_devm_kmalloc(dev); err |= test_devm_kzalloc(dev); device_unregister(dev); return err; } |
8fee81aa4 test_overflow: Re... |
595 596 597 598 599 |
static int __init test_module_init(void) { int err = 0; err |= test_overflow_calculation(); |
d36b6ad27 test_overflow: Ad... |
600 |
err |= test_overflow_shift(); |
ca90800a9 test_overflow: Ad... |
601 |
err |= test_overflow_allocation(); |
8fee81aa4 test_overflow: Re... |
602 603 604 605 606 607 608 609 610 |
if (err) { pr_warn("FAIL! "); err = -EINVAL; } else { pr_info("all tests passed "); } |
455a35a6c lib: add runtime ... |
611 |
|
8fee81aa4 test_overflow: Re... |
612 |
return err; |
455a35a6c lib: add runtime ... |
613 614 615 616 |
} static void __exit test_module_exit(void) { } |
8fee81aa4 test_overflow: Re... |
617 |
module_init(test_module_init); |
455a35a6c lib: add runtime ... |
618 619 |
module_exit(test_module_exit); MODULE_LICENSE("Dual MIT/GPL"); |