1// SPDX-License-Identifier: GPL-2.0 OR MIT 2/* 3 * Test cases for arithmetic overflow checks. 4 */ 5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 6 7#include <linux/device.h> 8#include <linux/init.h> 9#include <linux/kernel.h> 10#include <linux/mm.h> 11#include <linux/module.h> 12#include <linux/overflow.h> 13#include <linux/slab.h> 14#include <linux/types.h> 15#include <linux/vmalloc.h> 16 17#define DEFINE_TEST_ARRAY(t) \ 18 static const struct test_ ## t { \ 19 t a, b; \ 20 t sum, diff, prod; \ 21 bool s_of, d_of, p_of; \ 22 } t ## _tests[] __initconst 23 24DEFINE_TEST_ARRAY(u8) = { 25 {0, 0, 0, 0, 0, false, false, false}, 26 {1, 1, 2, 0, 1, false, false, false}, 27 {0, 1, 1, U8_MAX, 0, false, true, false}, 28 {1, 0, 1, 1, 0, false, false, false}, 29 {0, U8_MAX, U8_MAX, 1, 0, false, true, false}, 30 {U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false}, 31 {1, U8_MAX, 0, 2, U8_MAX, true, true, false}, 32 {U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false}, 33 {U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true}, 34 35 {U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true}, 36 {U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true}, 37 38 {1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false}, 39 {1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true}, 40 {1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false}, 41 {1U << 7, 1U << 7, 0, 0, 0, true, false, true}, 42 43 {48, 32, 80, 16, 0, false, false, true}, 44 {128, 128, 0, 0, 0, true, false, true}, 45 {123, 234, 101, 145, 110, true, true, true}, 46}; 47DEFINE_TEST_ARRAY(u16) = { 48 {0, 0, 0, 0, 0, false, false, false}, 49 {1, 1, 2, 0, 1, false, false, false}, 50 {0, 1, 1, U16_MAX, 0, false, true, false}, 51 {1, 0, 1, 1, 0, false, false, false}, 52 {0, U16_MAX, U16_MAX, 1, 0, false, true, false}, 53 {U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false}, 54 {1, U16_MAX, 0, 2, U16_MAX, true, true, false}, 55 {U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false}, 56 {U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true}, 57 58 {U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true}, 59 {U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true}, 60 61 {1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false}, 62 {1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true}, 63 {1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false}, 64 {1U << 15, 1U << 15, 0, 0, 0, true, false, true}, 65 66 {123, 234, 357, 65425, 28782, false, true, false}, 67 {1234, 2345, 3579, 64425, 10146, false, true, true}, 68}; 69DEFINE_TEST_ARRAY(u32) = { 70 {0, 0, 0, 0, 0, false, false, false}, 71 {1, 1, 2, 0, 1, false, false, false}, 72 {0, 1, 1, U32_MAX, 0, false, true, false}, 73 {1, 0, 1, 1, 0, false, false, false}, 74 {0, U32_MAX, U32_MAX, 1, 0, false, true, false}, 75 {U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false}, 76 {1, U32_MAX, 0, 2, U32_MAX, true, true, false}, 77 {U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false}, 78 {U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true}, 79 80 {U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true}, 81 {U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true}, 82 83 {1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false}, 84 {1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true}, 85 {1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false}, 86 {1U << 31, 1U << 31, 0, 0, 0, true, false, true}, 87 88 {-2U, 1U, -1U, -3U, -2U, false, false, false}, 89 {-4U, 5U, 1U, -9U, -20U, true, false, true}, 90}; 91 92DEFINE_TEST_ARRAY(u64) = { 93 {0, 0, 0, 0, 0, false, false, false}, 94 {1, 1, 2, 0, 1, false, false, false}, 95 {0, 1, 1, U64_MAX, 0, false, true, false}, 96 {1, 0, 1, 1, 0, false, false, false}, 97 {0, U64_MAX, U64_MAX, 1, 0, false, true, false}, 98 {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false}, 99 {1, U64_MAX, 0, 2, U64_MAX, true, true, false}, 100 {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false}, 101 {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true}, 102 103 {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true}, 104 {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true}, 105 106 {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false}, 107 {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true}, 108 {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false}, 109 {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true}, 110 {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */, 111 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL, 112 false, true, false}, 113 {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true}, 114}; 115 116DEFINE_TEST_ARRAY(s8) = { 117 {0, 0, 0, 0, 0, false, false, false}, 118 119 {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false}, 120 {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false}, 121 {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false}, 122 {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false}, 123 124 {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true}, 125 {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true}, 126 {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false}, 127 {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false}, 128 {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false}, 129 {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false}, 130 131 {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false}, 132 {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false}, 133 {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false}, 134 {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false}, 135 136 {S8_MIN, S8_MIN, 0, 0, 0, true, false, true}, 137 {S8_MAX, S8_MAX, -2, 0, 1, true, false, true}, 138 139 {-4, -32, -36, 28, -128, false, false, true}, 140 {-4, 32, 28, -36, -128, false, false, false}, 141}; 142 143DEFINE_TEST_ARRAY(s16) = { 144 {0, 0, 0, 0, 0, false, false, false}, 145 146 {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false}, 147 {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false}, 148 {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false}, 149 {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false}, 150 151 {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true}, 152 {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true}, 153 {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false}, 154 {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false}, 155 {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false}, 156 {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false}, 157 158 {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false}, 159 {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false}, 160 {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false}, 161 {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false}, 162 163 {S16_MIN, S16_MIN, 0, 0, 0, true, false, true}, 164 {S16_MAX, S16_MAX, -2, 0, 1, true, false, true}, 165}; 166DEFINE_TEST_ARRAY(s32) = { 167 {0, 0, 0, 0, 0, false, false, false}, 168 169 {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false}, 170 {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false}, 171 {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false}, 172 {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false}, 173 174 {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true}, 175 {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true}, 176 {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false}, 177 {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false}, 178 {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false}, 179 {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false}, 180 181 {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false}, 182 {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false}, 183 {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false}, 184 {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false}, 185 186 {S32_MIN, S32_MIN, 0, 0, 0, true, false, true}, 187 {S32_MAX, S32_MAX, -2, 0, 1, true, false, true}, 188}; 189DEFINE_TEST_ARRAY(s64) = { 190 {0, 0, 0, 0, 0, false, false, false}, 191 192 {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false}, 193 {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false}, 194 {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false}, 195 {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false}, 196 197 {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true}, 198 {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true}, 199 {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false}, 200 {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false}, 201 {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false}, 202 {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false}, 203 204 {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false}, 205 {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false}, 206 {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false}, 207 {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false}, 208 209 {S64_MIN, S64_MIN, 0, 0, 0, true, false, true}, 210 {S64_MAX, S64_MAX, -2, 0, 1, true, false, true}, 211 212 {-1, -1, -2, 0, 1, false, false, false}, 213 {-1, -128, -129, 127, 128, false, false, false}, 214 {-128, -1, -129, -127, 128, false, false, false}, 215 {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, 216}; 217 218#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ 219 t _r; \ 220 bool _of; \ 221 \ 222 _of = check_ ## op ## _overflow(a, b, &_r); \ 223 if (_of != of) { \ 224 pr_warn("expected "fmt" "sym" "fmt \ 225 " to%s overflow (type %s)\n", \ 226 a, b, of ? "" : " not", #t); \ 227 err = 1; \ 228 } \ 229 if (_r != r) { \ 230 pr_warn("expected "fmt" "sym" "fmt" == " \ 231 fmt", got "fmt" (type %s)\n", \ 232 a, b, r, _r, #t); \ 233 err = 1; \ 234 } \ 235} while (0) 236 237#define DEFINE_TEST_FUNC(t, fmt) \ 238static int __init do_test_ ## t(const struct test_ ## t *p) \ 239{ \ 240 int err = 0; \ 241 \ 242 check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ 243 check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ 244 check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ 245 check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ 246 check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ 247 \ 248 return err; \ 249} \ 250 \ 251static int __init test_ ## t ## _overflow(void) { \ 252 int err = 0; \ 253 unsigned i; \ 254 \ 255 pr_info("%-3s: %zu arithmetic tests\n", #t, \ 256 ARRAY_SIZE(t ## _tests)); \ 257 for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ 258 err |= do_test_ ## t(&t ## _tests[i]); \ 259 return err; \ 260} 261 262DEFINE_TEST_FUNC(u8, "%d"); 263DEFINE_TEST_FUNC(s8, "%d"); 264DEFINE_TEST_FUNC(u16, "%d"); 265DEFINE_TEST_FUNC(s16, "%d"); 266DEFINE_TEST_FUNC(u32, "%u"); 267DEFINE_TEST_FUNC(s32, "%d"); 268#if BITS_PER_LONG == 64 269DEFINE_TEST_FUNC(u64, "%llu"); 270DEFINE_TEST_FUNC(s64, "%lld"); 271#endif 272 273static int __init test_overflow_calculation(void) 274{ 275 int err = 0; 276 277 err |= test_u8_overflow(); 278 err |= test_s8_overflow(); 279 err |= test_u16_overflow(); 280 err |= test_s16_overflow(); 281 err |= test_u32_overflow(); 282 err |= test_s32_overflow(); 283#if BITS_PER_LONG == 64 284 err |= test_u64_overflow(); 285 err |= test_s64_overflow(); 286#endif 287 288 return err; 289} 290 291static int __init test_overflow_shift(void) 292{ 293 int err = 0; 294 295/* Args are: value, shift, type, expected result, overflow expected */ 296#define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \ 297 int __failed = 0; \ 298 typeof(a) __a = (a); \ 299 typeof(s) __s = (s); \ 300 t __e = (expect); \ 301 t __d; \ 302 bool __of = check_shl_overflow(__a, __s, &__d); \ 303 if (__of != of) { \ 304 pr_warn("expected (%s)(%s << %s) to%s overflow\n", \ 305 #t, #a, #s, of ? "" : " not"); \ 306 __failed = 1; \ 307 } else if (!__of && __d != __e) { \ 308 pr_warn("expected (%s)(%s << %s) == %s\n", \ 309 #t, #a, #s, #expect); \ 310 if ((t)-1 < 0) \ 311 pr_warn("got %lld\n", (s64)__d); \ 312 else \ 313 pr_warn("got %llu\n", (u64)__d); \ 314 __failed = 1; \ 315 } \ 316 if (!__failed) \ 317 pr_info("ok: (%s)(%s << %s) == %s\n", #t, #a, #s, \ 318 of ? "overflow" : #expect); \ 319 __failed; \ 320}) 321 322 /* Sane shifts. */ 323 err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); 324 err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); 325 err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); 326 err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); 327 err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); 328 err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); 329 err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); 330 err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); 331 err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); 332 err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); 333 err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); 334 err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); 335 err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); 336 err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); 337 err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); 338 err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); 339 err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); 340 err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); 341 err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); 342 err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); 343 err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); 344 err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); 345 err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); 346 err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); 347 err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); 348 err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 349 0xFFFFFFFFULL << 32, false); 350 351 /* Sane shift: start and end with 0, without a too-wide shift. */ 352 err |= TEST_ONE_SHIFT(0, 7, u8, 0, false); 353 err |= TEST_ONE_SHIFT(0, 15, u16, 0, false); 354 err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); 355 err |= TEST_ONE_SHIFT(0, 31, u32, 0, false); 356 err |= TEST_ONE_SHIFT(0, 63, u64, 0, false); 357 358 /* Sane shift: start and end with 0, without reaching signed bit. */ 359 err |= TEST_ONE_SHIFT(0, 6, s8, 0, false); 360 err |= TEST_ONE_SHIFT(0, 14, s16, 0, false); 361 err |= TEST_ONE_SHIFT(0, 30, int, 0, false); 362 err |= TEST_ONE_SHIFT(0, 30, s32, 0, false); 363 err |= TEST_ONE_SHIFT(0, 62, s64, 0, false); 364 365 /* Overflow: shifted the bit off the end. */ 366 err |= TEST_ONE_SHIFT(1, 8, u8, 0, true); 367 err |= TEST_ONE_SHIFT(1, 16, u16, 0, true); 368 err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); 369 err |= TEST_ONE_SHIFT(1, 32, u32, 0, true); 370 err |= TEST_ONE_SHIFT(1, 64, u64, 0, true); 371 372 /* Overflow: shifted into the signed bit. */ 373 err |= TEST_ONE_SHIFT(1, 7, s8, 0, true); 374 err |= TEST_ONE_SHIFT(1, 15, s16, 0, true); 375 err |= TEST_ONE_SHIFT(1, 31, int, 0, true); 376 err |= TEST_ONE_SHIFT(1, 31, s32, 0, true); 377 err |= TEST_ONE_SHIFT(1, 63, s64, 0, true); 378 379 /* Overflow: high bit falls off unsigned types. */ 380 /* 10010110 */ 381 err |= TEST_ONE_SHIFT(150, 1, u8, 0, true); 382 /* 1000100010010110 */ 383 err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true); 384 /* 10000100000010001000100010010110 */ 385 err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); 386 err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); 387 /* 1000001000010000010000000100000010000100000010001000100010010110 */ 388 err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); 389 390 /* Overflow: bit shifted into signed bit on signed types. */ 391 /* 01001011 */ 392 err |= TEST_ONE_SHIFT(75, 1, s8, 0, true); 393 /* 0100010001001011 */ 394 err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true); 395 /* 01000010000001000100010001001011 */ 396 err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); 397 err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true); 398 /* 0100000100001000001000000010000001000010000001000100010001001011 */ 399 err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); 400 401 /* Overflow: bit shifted past signed bit on signed types. */ 402 /* 01001011 */ 403 err |= TEST_ONE_SHIFT(75, 2, s8, 0, true); 404 /* 0100010001001011 */ 405 err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true); 406 /* 01000010000001000100010001001011 */ 407 err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); 408 err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true); 409 /* 0100000100001000001000000010000001000010000001000100010001001011 */ 410 err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); 411 412 /* Overflow: values larger than destination type. */ 413 err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true); 414 err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); 415 err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); 416 err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); 417 err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); 418 err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); 419 err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); 420 err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); 421 err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); 422 423 /* Nonsense: negative initial value. */ 424 err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true); 425 err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true); 426 err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true); 427 err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true); 428 err |= TEST_ONE_SHIFT(-10, 0, int, 0, true); 429 err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); 430 err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true); 431 err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true); 432 err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true); 433 err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true); 434 435 /* Nonsense: negative shift values. */ 436 err |= TEST_ONE_SHIFT(0, -5, s8, 0, true); 437 err |= TEST_ONE_SHIFT(0, -5, u8, 0, true); 438 err |= TEST_ONE_SHIFT(0, -10, s16, 0, true); 439 err |= TEST_ONE_SHIFT(0, -10, u16, 0, true); 440 err |= TEST_ONE_SHIFT(0, -15, int, 0, true); 441 err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); 442 err |= TEST_ONE_SHIFT(0, -20, s32, 0, true); 443 err |= TEST_ONE_SHIFT(0, -20, u32, 0, true); 444 err |= TEST_ONE_SHIFT(0, -30, s64, 0, true); 445 err |= TEST_ONE_SHIFT(0, -30, u64, 0, true); 446 447 /* Overflow: shifted at or beyond entire type's bit width. */ 448 err |= TEST_ONE_SHIFT(0, 8, u8, 0, true); 449 err |= TEST_ONE_SHIFT(0, 9, u8, 0, true); 450 err |= TEST_ONE_SHIFT(0, 8, s8, 0, true); 451 err |= TEST_ONE_SHIFT(0, 9, s8, 0, true); 452 err |= TEST_ONE_SHIFT(0, 16, u16, 0, true); 453 err |= TEST_ONE_SHIFT(0, 17, u16, 0, true); 454 err |= TEST_ONE_SHIFT(0, 16, s16, 0, true); 455 err |= TEST_ONE_SHIFT(0, 17, s16, 0, true); 456 err |= TEST_ONE_SHIFT(0, 32, u32, 0, true); 457 err |= TEST_ONE_SHIFT(0, 33, u32, 0, true); 458 err |= TEST_ONE_SHIFT(0, 32, int, 0, true); 459 err |= TEST_ONE_SHIFT(0, 33, int, 0, true); 460 err |= TEST_ONE_SHIFT(0, 32, s32, 0, true); 461 err |= TEST_ONE_SHIFT(0, 33, s32, 0, true); 462 err |= TEST_ONE_SHIFT(0, 64, u64, 0, true); 463 err |= TEST_ONE_SHIFT(0, 65, u64, 0, true); 464 err |= TEST_ONE_SHIFT(0, 64, s64, 0, true); 465 err |= TEST_ONE_SHIFT(0, 65, s64, 0, true); 466 467 /* 468 * Corner case: for unsigned types, we fail when we've shifted 469 * through the entire width of bits. For signed types, we might 470 * want to match this behavior, but that would mean noticing if 471 * we shift through all but the signed bit, and this is not 472 * currently detected (but we'll notice an overflow into the 473 * signed bit). So, for now, we will test this condition but 474 * mark it as not expected to overflow. 475 */ 476 err |= TEST_ONE_SHIFT(0, 7, s8, 0, false); 477 err |= TEST_ONE_SHIFT(0, 15, s16, 0, false); 478 err |= TEST_ONE_SHIFT(0, 31, int, 0, false); 479 err |= TEST_ONE_SHIFT(0, 31, s32, 0, false); 480 err |= TEST_ONE_SHIFT(0, 63, s64, 0, false); 481 482 return err; 483} 484 485/* 486 * Deal with the various forms of allocator arguments. See comments above 487 * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". 488 */ 489#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) 490#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) 491#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE) 492#define alloc000(alloc, arg, sz) alloc(sz) 493#define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) 494#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP) 495#define free0(free, arg, ptr) free(ptr) 496#define free1(free, arg, ptr) free(arg, ptr) 497 498/* Wrap around to 16K */ 499#define TEST_SIZE (5 * 4096) 500 501#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ 502static int __init test_ ## func (void *arg) \ 503{ \ 504 volatile size_t a = TEST_SIZE; \ 505 volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ 506 void *ptr; \ 507 \ 508 /* Tiny allocation test. */ \ 509 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ 510 if (!ptr) { \ 511 pr_warn(#func " failed regular allocation?!\n"); \ 512 return 1; \ 513 } \ 514 free ## want_arg (free_func, arg, ptr); \ 515 \ 516 /* Wrapped allocation test. */ \ 517 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ 518 a * b); \ 519 if (!ptr) { \ 520 pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \ 521 return 1; \ 522 } \ 523 free ## want_arg (free_func, arg, ptr); \ 524 \ 525 /* Saturated allocation test. */ \ 526 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ 527 array_size(a, b)); \ 528 if (ptr) { \ 529 pr_warn(#func " missed saturation!\n"); \ 530 free ## want_arg (free_func, arg, ptr); \ 531 return 1; \ 532 } \ 533 pr_info(#func " detected saturation\n"); \ 534 return 0; \ 535} 536 537/* 538 * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node()) 539 * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc()) 540 * Allocator uses a special leading argument + | | (e.g. devm_kmalloc()) 541 * | | | 542 */ 543DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0); 544DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1); 545DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0); 546DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1); 547DEFINE_TEST_ALLOC(vmalloc, vfree, 0, 0, 0); 548DEFINE_TEST_ALLOC(vmalloc_node, vfree, 0, 0, 1); 549DEFINE_TEST_ALLOC(vzalloc, vfree, 0, 0, 0); 550DEFINE_TEST_ALLOC(vzalloc_node, vfree, 0, 0, 1); 551DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0); 552DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1); 553DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0); 554DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); 555DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); 556DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); 557 558static int __init test_overflow_allocation(void) 559{ 560 const char device_name[] = "overflow-test"; 561 struct device *dev; 562 int err = 0; 563 564 /* Create dummy device for devm_kmalloc()-family tests. */ 565 dev = root_device_register(device_name); 566 if (IS_ERR(dev)) { 567 pr_warn("Cannot register test device\n"); 568 return 1; 569 } 570 571 err |= test_kmalloc(NULL); 572 err |= test_kmalloc_node(NULL); 573 err |= test_kzalloc(NULL); 574 err |= test_kzalloc_node(NULL); 575 err |= test_kvmalloc(NULL); 576 err |= test_kvmalloc_node(NULL); 577 err |= test_kvzalloc(NULL); 578 err |= test_kvzalloc_node(NULL); 579 err |= test_vmalloc(NULL); 580 err |= test_vmalloc_node(NULL); 581 err |= test_vzalloc(NULL); 582 err |= test_vzalloc_node(NULL); 583 err |= test_devm_kmalloc(dev); 584 err |= test_devm_kzalloc(dev); 585 586 device_unregister(dev); 587 588 return err; 589} 590 591static int __init test_module_init(void) 592{ 593 int err = 0; 594 595 err |= test_overflow_calculation(); 596 err |= test_overflow_shift(); 597 err |= test_overflow_allocation(); 598 599 if (err) { 600 pr_warn("FAIL!\n"); 601 err = -EINVAL; 602 } else { 603 pr_info("all tests passed\n"); 604 } 605 606 return err; 607} 608 609static void __exit test_module_exit(void) 610{ } 611 612module_init(test_module_init); 613module_exit(test_module_exit); 614MODULE_LICENSE("Dual MIT/GPL"); 615