overflow_kunit.c (25661B)
1// SPDX-License-Identifier: GPL-2.0 OR MIT 2/* 3 * Test cases for arithmetic overflow checks. See: 4 * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests 5 * ./tools/testing/kunit/kunit.py run overflow [--raw_output] 6 */ 7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9#include <kunit/test.h> 10#include <linux/device.h> 11#include <linux/kernel.h> 12#include <linux/mm.h> 13#include <linux/module.h> 14#include <linux/overflow.h> 15#include <linux/slab.h> 16#include <linux/types.h> 17#include <linux/vmalloc.h> 18 19#define DEFINE_TEST_ARRAY(t) \ 20 static const struct test_ ## t { \ 21 t a, b; \ 22 t sum, diff, prod; \ 23 bool s_of, d_of, p_of; \ 24 } t ## _tests[] 25 26DEFINE_TEST_ARRAY(u8) = { 27 {0, 0, 0, 0, 0, false, false, false}, 28 {1, 1, 2, 0, 1, false, false, false}, 29 {0, 1, 1, U8_MAX, 0, false, true, false}, 30 {1, 0, 1, 1, 0, false, false, false}, 31 {0, U8_MAX, U8_MAX, 1, 0, false, true, false}, 32 {U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false}, 33 {1, U8_MAX, 0, 2, U8_MAX, true, true, false}, 34 {U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false}, 35 {U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true}, 36 37 {U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true}, 38 {U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true}, 39 40 {1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false}, 41 {1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true}, 42 {1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false}, 43 {1U << 7, 1U << 7, 0, 0, 0, true, false, true}, 44 45 {48, 32, 80, 16, 0, false, false, true}, 46 {128, 128, 0, 0, 0, true, false, true}, 47 {123, 234, 101, 145, 110, true, true, true}, 48}; 49DEFINE_TEST_ARRAY(u16) = { 50 {0, 0, 0, 0, 0, false, false, false}, 51 {1, 1, 2, 0, 1, false, false, false}, 52 {0, 1, 1, U16_MAX, 0, false, true, false}, 53 {1, 0, 1, 1, 0, false, false, false}, 54 {0, U16_MAX, U16_MAX, 1, 0, false, true, false}, 55 {U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false}, 56 {1, U16_MAX, 0, 2, U16_MAX, true, true, false}, 57 {U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false}, 58 {U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true}, 59 60 {U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true}, 61 {U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true}, 62 63 {1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false}, 64 {1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true}, 65 {1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false}, 66 {1U << 15, 1U << 15, 0, 0, 0, true, false, true}, 67 68 {123, 234, 357, 65425, 28782, false, true, false}, 69 {1234, 2345, 3579, 64425, 10146, false, true, true}, 70}; 71DEFINE_TEST_ARRAY(u32) = { 72 {0, 0, 0, 0, 0, false, false, false}, 73 {1, 1, 2, 0, 1, false, false, false}, 74 {0, 1, 1, U32_MAX, 0, false, true, false}, 75 {1, 0, 1, 1, 0, false, false, false}, 76 {0, U32_MAX, U32_MAX, 1, 0, false, true, false}, 77 {U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false}, 78 {1, U32_MAX, 0, 2, U32_MAX, true, true, false}, 79 {U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false}, 80 {U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true}, 81 82 {U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true}, 83 {U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true}, 84 85 {1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false}, 86 {1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true}, 87 {1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false}, 88 {1U << 31, 1U << 31, 0, 0, 0, true, false, true}, 89 90 {-2U, 1U, -1U, -3U, -2U, false, false, false}, 91 {-4U, 5U, 1U, -9U, -20U, true, false, true}, 92}; 93 94DEFINE_TEST_ARRAY(u64) = { 95 {0, 0, 0, 0, 0, false, false, false}, 96 {1, 1, 2, 0, 1, false, false, false}, 97 {0, 1, 1, U64_MAX, 0, false, true, false}, 98 {1, 0, 1, 1, 0, false, false, false}, 99 {0, U64_MAX, U64_MAX, 1, 0, false, true, false}, 100 {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false}, 101 {1, U64_MAX, 0, 2, U64_MAX, true, true, false}, 102 {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false}, 103 {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true}, 104 105 {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true}, 106 {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true}, 107 108 {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false}, 109 {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true}, 110 {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false}, 111 {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true}, 112 {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */, 113 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL, 114 false, true, false}, 115 {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true}, 116}; 117 118DEFINE_TEST_ARRAY(s8) = { 119 {0, 0, 0, 0, 0, false, false, false}, 120 121 {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false}, 122 {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false}, 123 {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false}, 124 {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false}, 125 126 {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true}, 127 {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true}, 128 {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false}, 129 {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false}, 130 {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false}, 131 {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false}, 132 133 {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false}, 134 {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false}, 135 {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false}, 136 {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false}, 137 138 {S8_MIN, S8_MIN, 0, 0, 0, true, false, true}, 139 {S8_MAX, S8_MAX, -2, 0, 1, true, false, true}, 140 141 {-4, -32, -36, 28, -128, false, false, true}, 142 {-4, 32, 28, -36, -128, false, false, false}, 143}; 144 145DEFINE_TEST_ARRAY(s16) = { 146 {0, 0, 0, 0, 0, false, false, false}, 147 148 {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false}, 149 {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false}, 150 {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false}, 151 {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false}, 152 153 {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true}, 154 {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true}, 155 {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false}, 156 {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false}, 157 {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false}, 158 {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false}, 159 160 {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false}, 161 {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false}, 162 {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false}, 163 {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false}, 164 165 {S16_MIN, S16_MIN, 0, 0, 0, true, false, true}, 166 {S16_MAX, S16_MAX, -2, 0, 1, true, false, true}, 167}; 168DEFINE_TEST_ARRAY(s32) = { 169 {0, 0, 0, 0, 0, false, false, false}, 170 171 {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false}, 172 {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false}, 173 {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false}, 174 {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false}, 175 176 {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true}, 177 {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true}, 178 {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false}, 179 {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false}, 180 {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false}, 181 {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false}, 182 183 {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false}, 184 {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false}, 185 {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false}, 186 {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false}, 187 188 {S32_MIN, S32_MIN, 0, 0, 0, true, false, true}, 189 {S32_MAX, S32_MAX, -2, 0, 1, true, false, true}, 190}; 191DEFINE_TEST_ARRAY(s64) = { 192 {0, 0, 0, 0, 0, false, false, false}, 193 194 {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false}, 195 {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false}, 196 {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false}, 197 {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false}, 198 199 {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true}, 200 {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true}, 201 {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false}, 202 {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false}, 203 {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false}, 204 {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false}, 205 206 {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false}, 207 {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false}, 208 {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false}, 209 {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false}, 210 211 {S64_MIN, S64_MIN, 0, 0, 0, true, false, true}, 212 {S64_MAX, S64_MAX, -2, 0, 1, true, false, true}, 213 214 {-1, -1, -2, 0, 1, false, false, false}, 215 {-1, -128, -129, 127, 128, false, false, false}, 216 {-128, -1, -129, -127, 128, false, false, false}, 217 {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, 218}; 219 220#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ 221 t _r; \ 222 bool _of; \ 223 \ 224 _of = check_ ## op ## _overflow(a, b, &_r); \ 225 KUNIT_EXPECT_EQ_MSG(test, _of, of, \ 226 "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \ 227 a, b, of ? "" : " not", #t); \ 228 KUNIT_EXPECT_EQ_MSG(test, _r, r, \ 229 "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ 230 a, b, r, _r, #t); \ 231} while (0) 232 233#define DEFINE_TEST_FUNC(t, fmt) \ 234static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \ 235{ \ 236 check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ 237 check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ 238 check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ 239 check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ 240 check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ 241} \ 242 \ 243static void t ## _overflow_test(struct kunit *test) { \ 244 unsigned i; \ 245 \ 246 for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ 247 do_test_ ## t(test, &t ## _tests[i]); \ 248 kunit_info(test, "%zu %s arithmetic tests finished\n", \ 249 ARRAY_SIZE(t ## _tests), #t); \ 250} 251 252DEFINE_TEST_FUNC(u8, "%d"); 253DEFINE_TEST_FUNC(s8, "%d"); 254DEFINE_TEST_FUNC(u16, "%d"); 255DEFINE_TEST_FUNC(s16, "%d"); 256DEFINE_TEST_FUNC(u32, "%u"); 257DEFINE_TEST_FUNC(s32, "%d"); 258#if BITS_PER_LONG == 64 259DEFINE_TEST_FUNC(u64, "%llu"); 260DEFINE_TEST_FUNC(s64, "%lld"); 261#endif 262 263static void overflow_shift_test(struct kunit *test) 264{ 265 int count = 0; 266 267/* Args are: value, shift, type, expected result, overflow expected */ 268#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \ 269 typeof(a) __a = (a); \ 270 typeof(s) __s = (s); \ 271 t __e = (expect); \ 272 t __d; \ 273 bool __of = check_shl_overflow(__a, __s, &__d); \ 274 if (__of != of) { \ 275 KUNIT_EXPECT_EQ_MSG(test, __of, of, \ 276 "expected (%s)(%s << %s) to%s overflow\n", \ 277 #t, #a, #s, of ? "" : " not"); \ 278 } else if (!__of && __d != __e) { \ 279 KUNIT_EXPECT_EQ_MSG(test, __d, __e, \ 280 "expected (%s)(%s << %s) == %s\n", \ 281 #t, #a, #s, #expect); \ 282 if ((t)-1 < 0) \ 283 kunit_info(test, "got %lld\n", (s64)__d); \ 284 else \ 285 kunit_info(test, "got %llu\n", (u64)__d); \ 286 } \ 287 count++; \ 288} while (0) 289 290 /* Sane shifts. */ 291 TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); 292 TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); 293 TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); 294 TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); 295 TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); 296 TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); 297 TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); 298 TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); 299 TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); 300 TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); 301 TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); 302 TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); 303 TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); 304 TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); 305 TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); 306 TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); 307 TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); 308 TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); 309 TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); 310 TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); 311 TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); 312 TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); 313 TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); 314 TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); 315 TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); 316 TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); 317 318 /* Sane shift: start and end with 0, without a too-wide shift. */ 319 TEST_ONE_SHIFT(0, 7, u8, 0, false); 320 TEST_ONE_SHIFT(0, 15, u16, 0, false); 321 TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); 322 TEST_ONE_SHIFT(0, 31, u32, 0, false); 323 TEST_ONE_SHIFT(0, 63, u64, 0, false); 324 325 /* Sane shift: start and end with 0, without reaching signed bit. */ 326 TEST_ONE_SHIFT(0, 6, s8, 0, false); 327 TEST_ONE_SHIFT(0, 14, s16, 0, false); 328 TEST_ONE_SHIFT(0, 30, int, 0, false); 329 TEST_ONE_SHIFT(0, 30, s32, 0, false); 330 TEST_ONE_SHIFT(0, 62, s64, 0, false); 331 332 /* Overflow: shifted the bit off the end. */ 333 TEST_ONE_SHIFT(1, 8, u8, 0, true); 334 TEST_ONE_SHIFT(1, 16, u16, 0, true); 335 TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); 336 TEST_ONE_SHIFT(1, 32, u32, 0, true); 337 TEST_ONE_SHIFT(1, 64, u64, 0, true); 338 339 /* Overflow: shifted into the signed bit. */ 340 TEST_ONE_SHIFT(1, 7, s8, 0, true); 341 TEST_ONE_SHIFT(1, 15, s16, 0, true); 342 TEST_ONE_SHIFT(1, 31, int, 0, true); 343 TEST_ONE_SHIFT(1, 31, s32, 0, true); 344 TEST_ONE_SHIFT(1, 63, s64, 0, true); 345 346 /* Overflow: high bit falls off unsigned types. */ 347 /* 10010110 */ 348 TEST_ONE_SHIFT(150, 1, u8, 0, true); 349 /* 1000100010010110 */ 350 TEST_ONE_SHIFT(34966, 1, u16, 0, true); 351 /* 10000100000010001000100010010110 */ 352 TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); 353 TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); 354 /* 1000001000010000010000000100000010000100000010001000100010010110 */ 355 TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); 356 357 /* Overflow: bit shifted into signed bit on signed types. */ 358 /* 01001011 */ 359 TEST_ONE_SHIFT(75, 1, s8, 0, true); 360 /* 0100010001001011 */ 361 TEST_ONE_SHIFT(17483, 1, s16, 0, true); 362 /* 01000010000001000100010001001011 */ 363 TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); 364 TEST_ONE_SHIFT(1107575883, 1, int, 0, true); 365 /* 0100000100001000001000000010000001000010000001000100010001001011 */ 366 TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); 367 368 /* Overflow: bit shifted past signed bit on signed types. */ 369 /* 01001011 */ 370 TEST_ONE_SHIFT(75, 2, s8, 0, true); 371 /* 0100010001001011 */ 372 TEST_ONE_SHIFT(17483, 2, s16, 0, true); 373 /* 01000010000001000100010001001011 */ 374 TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); 375 TEST_ONE_SHIFT(1107575883, 2, int, 0, true); 376 /* 0100000100001000001000000010000001000010000001000100010001001011 */ 377 TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); 378 379 /* Overflow: values larger than destination type. */ 380 TEST_ONE_SHIFT(0x100, 0, u8, 0, true); 381 TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); 382 TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); 383 TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); 384 TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); 385 TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); 386 TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); 387 TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); 388 TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); 389 390 /* Nonsense: negative initial value. */ 391 TEST_ONE_SHIFT(-1, 0, s8, 0, true); 392 TEST_ONE_SHIFT(-1, 0, u8, 0, true); 393 TEST_ONE_SHIFT(-5, 0, s16, 0, true); 394 TEST_ONE_SHIFT(-5, 0, u16, 0, true); 395 TEST_ONE_SHIFT(-10, 0, int, 0, true); 396 TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); 397 TEST_ONE_SHIFT(-100, 0, s32, 0, true); 398 TEST_ONE_SHIFT(-100, 0, u32, 0, true); 399 TEST_ONE_SHIFT(-10000, 0, s64, 0, true); 400 TEST_ONE_SHIFT(-10000, 0, u64, 0, true); 401 402 /* Nonsense: negative shift values. */ 403 TEST_ONE_SHIFT(0, -5, s8, 0, true); 404 TEST_ONE_SHIFT(0, -5, u8, 0, true); 405 TEST_ONE_SHIFT(0, -10, s16, 0, true); 406 TEST_ONE_SHIFT(0, -10, u16, 0, true); 407 TEST_ONE_SHIFT(0, -15, int, 0, true); 408 TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); 409 TEST_ONE_SHIFT(0, -20, s32, 0, true); 410 TEST_ONE_SHIFT(0, -20, u32, 0, true); 411 TEST_ONE_SHIFT(0, -30, s64, 0, true); 412 TEST_ONE_SHIFT(0, -30, u64, 0, true); 413 414 /* Overflow: shifted at or beyond entire type's bit width. */ 415 TEST_ONE_SHIFT(0, 8, u8, 0, true); 416 TEST_ONE_SHIFT(0, 9, u8, 0, true); 417 TEST_ONE_SHIFT(0, 8, s8, 0, true); 418 TEST_ONE_SHIFT(0, 9, s8, 0, true); 419 TEST_ONE_SHIFT(0, 16, u16, 0, true); 420 TEST_ONE_SHIFT(0, 17, u16, 0, true); 421 TEST_ONE_SHIFT(0, 16, s16, 0, true); 422 TEST_ONE_SHIFT(0, 17, s16, 0, true); 423 TEST_ONE_SHIFT(0, 32, u32, 0, true); 424 TEST_ONE_SHIFT(0, 33, u32, 0, true); 425 TEST_ONE_SHIFT(0, 32, int, 0, true); 426 TEST_ONE_SHIFT(0, 33, int, 0, true); 427 TEST_ONE_SHIFT(0, 32, s32, 0, true); 428 TEST_ONE_SHIFT(0, 33, s32, 0, true); 429 TEST_ONE_SHIFT(0, 64, u64, 0, true); 430 TEST_ONE_SHIFT(0, 65, u64, 0, true); 431 TEST_ONE_SHIFT(0, 64, s64, 0, true); 432 TEST_ONE_SHIFT(0, 65, s64, 0, true); 433 434 /* 435 * Corner case: for unsigned types, we fail when we've shifted 436 * through the entire width of bits. For signed types, we might 437 * want to match this behavior, but that would mean noticing if 438 * we shift through all but the signed bit, and this is not 439 * currently detected (but we'll notice an overflow into the 440 * signed bit). So, for now, we will test this condition but 441 * mark it as not expected to overflow. 442 */ 443 TEST_ONE_SHIFT(0, 7, s8, 0, false); 444 TEST_ONE_SHIFT(0, 15, s16, 0, false); 445 TEST_ONE_SHIFT(0, 31, int, 0, false); 446 TEST_ONE_SHIFT(0, 31, s32, 0, false); 447 TEST_ONE_SHIFT(0, 63, s64, 0, false); 448 449 kunit_info(test, "%d shift tests finished\n", count); 450#undef TEST_ONE_SHIFT 451} 452 453/* 454 * Deal with the various forms of allocator arguments. See comments above 455 * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". 456 */ 457#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) 458#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) 459#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE) 460#define alloc000(alloc, arg, sz) alloc(sz) 461#define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) 462#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP) 463#define free0(free, arg, ptr) free(ptr) 464#define free1(free, arg, ptr) free(arg, ptr) 465 466/* Wrap around to 16K */ 467#define TEST_SIZE (5 * 4096) 468 469#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ 470static void test_ ## func (struct kunit *test, void *arg) \ 471{ \ 472 volatile size_t a = TEST_SIZE; \ 473 volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ 474 void *ptr; \ 475 \ 476 /* Tiny allocation test. */ \ 477 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ 478 KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ 479 #func " failed regular allocation?!\n"); \ 480 free ## want_arg (free_func, arg, ptr); \ 481 \ 482 /* Wrapped allocation test. */ \ 483 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ 484 a * b); \ 485 KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ 486 #func " unexpectedly failed bad wrapping?!\n"); \ 487 free ## want_arg (free_func, arg, ptr); \ 488 \ 489 /* Saturated allocation test. */ \ 490 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ 491 array_size(a, b)); \ 492 if (ptr) { \ 493 KUNIT_FAIL(test, #func " missed saturation!\n"); \ 494 free ## want_arg (free_func, arg, ptr); \ 495 } \ 496} 497 498/* 499 * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node()) 500 * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc()) 501 * Allocator uses a special leading argument + | | (e.g. devm_kmalloc()) 502 * | | | 503 */ 504DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0); 505DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1); 506DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0); 507DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1); 508DEFINE_TEST_ALLOC(__vmalloc, vfree, 0, 1, 0); 509DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0); 510DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1); 511DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0); 512DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); 513DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); 514DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); 515 516static void overflow_allocation_test(struct kunit *test) 517{ 518 const char device_name[] = "overflow-test"; 519 struct device *dev; 520 int count = 0; 521 522#define check_allocation_overflow(alloc) do { \ 523 count++; \ 524 test_ ## alloc(test, dev); \ 525} while (0) 526 527 /* Create dummy device for devm_kmalloc()-family tests. */ 528 dev = root_device_register(device_name); 529 KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), 530 "Cannot register test device\n"); 531 532 check_allocation_overflow(kmalloc); 533 check_allocation_overflow(kmalloc_node); 534 check_allocation_overflow(kzalloc); 535 check_allocation_overflow(kzalloc_node); 536 check_allocation_overflow(__vmalloc); 537 check_allocation_overflow(kvmalloc); 538 check_allocation_overflow(kvmalloc_node); 539 check_allocation_overflow(kvzalloc); 540 check_allocation_overflow(kvzalloc_node); 541 check_allocation_overflow(devm_kmalloc); 542 check_allocation_overflow(devm_kzalloc); 543 544 device_unregister(dev); 545 546 kunit_info(test, "%d allocation overflow tests finished\n", count); 547#undef check_allocation_overflow 548} 549 550struct __test_flex_array { 551 unsigned long flags; 552 size_t count; 553 unsigned long data[]; 554}; 555 556static void overflow_size_helpers_test(struct kunit *test) 557{ 558 /* Make sure struct_size() can be used in a constant expression. */ 559 u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)]; 560 struct __test_flex_array *obj; 561 int count = 0; 562 int var; 563 volatile int unconst = 0; 564 565 /* Verify constant expression against runtime version. */ 566 var = 55; 567 OPTIMIZER_HIDE_VAR(var); 568 KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var)); 569 570#define check_one_size_helper(expected, func, args...) do { \ 571 size_t _r = func(args); \ 572 KUNIT_EXPECT_EQ_MSG(test, _r, expected, \ 573 "expected " #func "(" #args ") to return %zu but got %zu instead\n", \ 574 (size_t)(expected), _r); \ 575 count++; \ 576} while (0) 577 578 var = 4; 579 check_one_size_helper(20, size_mul, var++, 5); 580 check_one_size_helper(20, size_mul, 4, var++); 581 check_one_size_helper(0, size_mul, 0, 3); 582 check_one_size_helper(0, size_mul, 3, 0); 583 check_one_size_helper(6, size_mul, 2, 3); 584 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1); 585 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3); 586 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3); 587 588 var = 4; 589 check_one_size_helper(9, size_add, var++, 5); 590 check_one_size_helper(9, size_add, 4, var++); 591 check_one_size_helper(9, size_add, 9, 0); 592 check_one_size_helper(9, size_add, 0, 9); 593 check_one_size_helper(5, size_add, 2, 3); 594 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1); 595 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3); 596 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3); 597 598 var = 4; 599 check_one_size_helper(1, size_sub, var--, 3); 600 check_one_size_helper(1, size_sub, 4, var--); 601 check_one_size_helper(1, size_sub, 3, 2); 602 check_one_size_helper(9, size_sub, 9, 0); 603 check_one_size_helper(SIZE_MAX, size_sub, 9, -3); 604 check_one_size_helper(SIZE_MAX, size_sub, 0, 9); 605 check_one_size_helper(SIZE_MAX, size_sub, 2, 3); 606 check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0); 607 check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10); 608 check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX); 609 check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX); 610 check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1); 611 check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3); 612 check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3); 613 614 var = 4; 615 check_one_size_helper(4 * sizeof(*obj->data), 616 flex_array_size, obj, data, var++); 617 check_one_size_helper(5 * sizeof(*obj->data), 618 flex_array_size, obj, data, var++); 619 check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst); 620 check_one_size_helper(sizeof(*obj->data), 621 flex_array_size, obj, data, 1 + unconst); 622 check_one_size_helper(7 * sizeof(*obj->data), 623 flex_array_size, obj, data, 7 + unconst); 624 check_one_size_helper(SIZE_MAX, 625 flex_array_size, obj, data, -1 + unconst); 626 check_one_size_helper(SIZE_MAX, 627 flex_array_size, obj, data, SIZE_MAX - 4 + unconst); 628 629 var = 4; 630 check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)), 631 struct_size, obj, data, var++); 632 check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)), 633 struct_size, obj, data, var++); 634 check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst); 635 check_one_size_helper(sizeof(*obj) + sizeof(*obj->data), 636 struct_size, obj, data, 1 + unconst); 637 check_one_size_helper(SIZE_MAX, 638 struct_size, obj, data, -3 + unconst); 639 check_one_size_helper(SIZE_MAX, 640 struct_size, obj, data, SIZE_MAX - 3 + unconst); 641 642 kunit_info(test, "%d overflow size helper tests finished\n", count); 643#undef check_one_size_helper 644} 645 646static struct kunit_case overflow_test_cases[] = { 647 KUNIT_CASE(u8_overflow_test), 648 KUNIT_CASE(s8_overflow_test), 649 KUNIT_CASE(u16_overflow_test), 650 KUNIT_CASE(s16_overflow_test), 651 KUNIT_CASE(u32_overflow_test), 652 KUNIT_CASE(s32_overflow_test), 653#if BITS_PER_LONG == 64 654 KUNIT_CASE(u64_overflow_test), 655 KUNIT_CASE(s64_overflow_test), 656#endif 657 KUNIT_CASE(overflow_shift_test), 658 KUNIT_CASE(overflow_allocation_test), 659 KUNIT_CASE(overflow_size_helpers_test), 660 {} 661}; 662 663static struct kunit_suite overflow_test_suite = { 664 .name = "overflow", 665 .test_cases = overflow_test_cases, 666}; 667 668kunit_test_suite(overflow_test_suite); 669 670MODULE_LICENSE("Dual MIT/GPL");