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 26 DEFINE_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 }; 49 DEFINE_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 }; 71 DEFINE_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 94 #if BITS_PER_LONG == 64 95 DEFINE_TEST_ARRAY(u64) = { 96 {0, 0, 0, 0, 0, false, false, false}, 97 {1, 1, 2, 0, 1, false, false, false}, 98 {0, 1, 1, U64_MAX, 0, false, true, false}, 99 {1, 0, 1, 1, 0, false, false, false}, 100 {0, U64_MAX, U64_MAX, 1, 0, false, true, false}, 101 {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false}, 102 {1, U64_MAX, 0, 2, U64_MAX, true, true, false}, 103 {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false}, 104 {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true}, 105 106 {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true}, 107 {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true}, 108 109 {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false}, 110 {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true}, 111 {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false}, 112 {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true}, 113 {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */, 114 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL, 115 false, true, false}, 116 {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true}, 117 }; 118 #endif 119 120 DEFINE_TEST_ARRAY(s8) = { 121 {0, 0, 0, 0, 0, false, false, false}, 122 123 {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false}, 124 {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false}, 125 {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false}, 126 {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false}, 127 128 {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true}, 129 {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true}, 130 {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false}, 131 {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false}, 132 {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false}, 133 {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false}, 134 135 {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false}, 136 {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false}, 137 {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false}, 138 {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false}, 139 140 {S8_MIN, S8_MIN, 0, 0, 0, true, false, true}, 141 {S8_MAX, S8_MAX, -2, 0, 1, true, false, true}, 142 143 {-4, -32, -36, 28, -128, false, false, true}, 144 {-4, 32, 28, -36, -128, false, false, false}, 145 }; 146 147 DEFINE_TEST_ARRAY(s16) = { 148 {0, 0, 0, 0, 0, false, false, false}, 149 150 {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false}, 151 {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false}, 152 {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false}, 153 {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false}, 154 155 {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true}, 156 {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true}, 157 {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false}, 158 {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false}, 159 {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false}, 160 {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false}, 161 162 {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false}, 163 {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false}, 164 {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false}, 165 {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false}, 166 167 {S16_MIN, S16_MIN, 0, 0, 0, true, false, true}, 168 {S16_MAX, S16_MAX, -2, 0, 1, true, false, true}, 169 }; 170 DEFINE_TEST_ARRAY(s32) = { 171 {0, 0, 0, 0, 0, false, false, false}, 172 173 {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false}, 174 {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false}, 175 {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false}, 176 {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false}, 177 178 {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true}, 179 {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true}, 180 {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false}, 181 {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false}, 182 {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false}, 183 {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false}, 184 185 {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false}, 186 {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false}, 187 {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false}, 188 {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false}, 189 190 {S32_MIN, S32_MIN, 0, 0, 0, true, false, true}, 191 {S32_MAX, S32_MAX, -2, 0, 1, true, false, true}, 192 }; 193 194 #if BITS_PER_LONG == 64 195 DEFINE_TEST_ARRAY(s64) = { 196 {0, 0, 0, 0, 0, false, false, false}, 197 198 {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false}, 199 {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false}, 200 {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false}, 201 {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false}, 202 203 {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true}, 204 {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true}, 205 {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false}, 206 {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false}, 207 {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false}, 208 {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false}, 209 210 {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false}, 211 {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false}, 212 {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false}, 213 {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false}, 214 215 {S64_MIN, S64_MIN, 0, 0, 0, true, false, true}, 216 {S64_MAX, S64_MAX, -2, 0, 1, true, false, true}, 217 218 {-1, -1, -2, 0, 1, false, false, false}, 219 {-1, -128, -129, 127, 128, false, false, false}, 220 {-128, -1, -129, -127, 128, false, false, false}, 221 {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, 222 }; 223 #endif 224 225 #define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ 226 t _r; \ 227 bool _of; \ 228 \ 229 _of = check_ ## op ## _overflow(a, b, &_r); \ 230 KUNIT_EXPECT_EQ_MSG(test, _of, of, \ 231 "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \ 232 a, b, of ? "" : " not", #t); \ 233 KUNIT_EXPECT_EQ_MSG(test, _r, r, \ 234 "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ 235 a, b, r, _r, #t); \ 236 } while (0) 237 238 #define DEFINE_TEST_FUNC(t, fmt) \ 239 static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \ 240 { \ 241 check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ 242 check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ 243 check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ 244 check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ 245 check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ 246 } \ 247 \ 248 static void t ## _overflow_test(struct kunit *test) { \ 249 unsigned i; \ 250 \ 251 for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ 252 do_test_ ## t(test, &t ## _tests[i]); \ 253 kunit_info(test, "%zu %s arithmetic tests finished\n", \ 254 ARRAY_SIZE(t ## _tests), #t); \ 255 } 256 257 DEFINE_TEST_FUNC(u8, "%d"); 258 DEFINE_TEST_FUNC(s8, "%d"); 259 DEFINE_TEST_FUNC(u16, "%d"); 260 DEFINE_TEST_FUNC(s16, "%d"); 261 DEFINE_TEST_FUNC(u32, "%u"); 262 DEFINE_TEST_FUNC(s32, "%d"); 263 #if BITS_PER_LONG == 64 264 DEFINE_TEST_FUNC(u64, "%llu"); 265 DEFINE_TEST_FUNC(s64, "%lld"); 266 #endif 267 268 static void overflow_shift_test(struct kunit *test) 269 { 270 int count = 0; 271 272 /* Args are: value, shift, type, expected result, overflow expected */ 273 #define TEST_ONE_SHIFT(a, s, t, expect, of) do { \ 274 typeof(a) __a = (a); \ 275 typeof(s) __s = (s); \ 276 t __e = (expect); \ 277 t __d; \ 278 bool __of = check_shl_overflow(__a, __s, &__d); \ 279 if (__of != of) { \ 280 KUNIT_EXPECT_EQ_MSG(test, __of, of, \ 281 "expected (%s)(%s << %s) to%s overflow\n", \ 282 #t, #a, #s, of ? "" : " not"); \ 283 } else if (!__of && __d != __e) { \ 284 KUNIT_EXPECT_EQ_MSG(test, __d, __e, \ 285 "expected (%s)(%s << %s) == %s\n", \ 286 #t, #a, #s, #expect); \ 287 if ((t)-1 < 0) \ 288 kunit_info(test, "got %lld\n", (s64)__d); \ 289 else \ 290 kunit_info(test, "got %llu\n", (u64)__d); \ 291 } \ 292 count++; \ 293 } while (0) 294 295 /* Sane shifts. */ 296 TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); 297 TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); 298 TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); 299 TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); 300 TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); 301 TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); 302 TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); 303 TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); 304 TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); 305 TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); 306 TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); 307 TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); 308 TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); 309 TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); 310 TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); 311 TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); 312 TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); 313 TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); 314 TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); 315 TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); 316 TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); 317 TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); 318 TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); 319 TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); 320 TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); 321 TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); 322 323 /* Sane shift: start and end with 0, without a too-wide shift. */ 324 TEST_ONE_SHIFT(0, 7, u8, 0, false); 325 TEST_ONE_SHIFT(0, 15, u16, 0, false); 326 TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); 327 TEST_ONE_SHIFT(0, 31, u32, 0, false); 328 TEST_ONE_SHIFT(0, 63, u64, 0, false); 329 330 /* Sane shift: start and end with 0, without reaching signed bit. */ 331 TEST_ONE_SHIFT(0, 6, s8, 0, false); 332 TEST_ONE_SHIFT(0, 14, s16, 0, false); 333 TEST_ONE_SHIFT(0, 30, int, 0, false); 334 TEST_ONE_SHIFT(0, 30, s32, 0, false); 335 TEST_ONE_SHIFT(0, 62, s64, 0, false); 336 337 /* Overflow: shifted the bit off the end. */ 338 TEST_ONE_SHIFT(1, 8, u8, 0, true); 339 TEST_ONE_SHIFT(1, 16, u16, 0, true); 340 TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); 341 TEST_ONE_SHIFT(1, 32, u32, 0, true); 342 TEST_ONE_SHIFT(1, 64, u64, 0, true); 343 344 /* Overflow: shifted into the signed bit. */ 345 TEST_ONE_SHIFT(1, 7, s8, 0, true); 346 TEST_ONE_SHIFT(1, 15, s16, 0, true); 347 TEST_ONE_SHIFT(1, 31, int, 0, true); 348 TEST_ONE_SHIFT(1, 31, s32, 0, true); 349 TEST_ONE_SHIFT(1, 63, s64, 0, true); 350 351 /* Overflow: high bit falls off unsigned types. */ 352 /* 10010110 */ 353 TEST_ONE_SHIFT(150, 1, u8, 0, true); 354 /* 1000100010010110 */ 355 TEST_ONE_SHIFT(34966, 1, u16, 0, true); 356 /* 10000100000010001000100010010110 */ 357 TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); 358 TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); 359 /* 1000001000010000010000000100000010000100000010001000100010010110 */ 360 TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); 361 362 /* Overflow: bit shifted into signed bit on signed types. */ 363 /* 01001011 */ 364 TEST_ONE_SHIFT(75, 1, s8, 0, true); 365 /* 0100010001001011 */ 366 TEST_ONE_SHIFT(17483, 1, s16, 0, true); 367 /* 01000010000001000100010001001011 */ 368 TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); 369 TEST_ONE_SHIFT(1107575883, 1, int, 0, true); 370 /* 0100000100001000001000000010000001000010000001000100010001001011 */ 371 TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); 372 373 /* Overflow: bit shifted past signed bit on signed types. */ 374 /* 01001011 */ 375 TEST_ONE_SHIFT(75, 2, s8, 0, true); 376 /* 0100010001001011 */ 377 TEST_ONE_SHIFT(17483, 2, s16, 0, true); 378 /* 01000010000001000100010001001011 */ 379 TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); 380 TEST_ONE_SHIFT(1107575883, 2, int, 0, true); 381 /* 0100000100001000001000000010000001000010000001000100010001001011 */ 382 TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); 383 384 /* Overflow: values larger than destination type. */ 385 TEST_ONE_SHIFT(0x100, 0, u8, 0, true); 386 TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); 387 TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); 388 TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); 389 TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); 390 TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); 391 TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); 392 TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); 393 TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); 394 395 /* Nonsense: negative initial value. */ 396 TEST_ONE_SHIFT(-1, 0, s8, 0, true); 397 TEST_ONE_SHIFT(-1, 0, u8, 0, true); 398 TEST_ONE_SHIFT(-5, 0, s16, 0, true); 399 TEST_ONE_SHIFT(-5, 0, u16, 0, true); 400 TEST_ONE_SHIFT(-10, 0, int, 0, true); 401 TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); 402 TEST_ONE_SHIFT(-100, 0, s32, 0, true); 403 TEST_ONE_SHIFT(-100, 0, u32, 0, true); 404 TEST_ONE_SHIFT(-10000, 0, s64, 0, true); 405 TEST_ONE_SHIFT(-10000, 0, u64, 0, true); 406 407 /* Nonsense: negative shift values. */ 408 TEST_ONE_SHIFT(0, -5, s8, 0, true); 409 TEST_ONE_SHIFT(0, -5, u8, 0, true); 410 TEST_ONE_SHIFT(0, -10, s16, 0, true); 411 TEST_ONE_SHIFT(0, -10, u16, 0, true); 412 TEST_ONE_SHIFT(0, -15, int, 0, true); 413 TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); 414 TEST_ONE_SHIFT(0, -20, s32, 0, true); 415 TEST_ONE_SHIFT(0, -20, u32, 0, true); 416 TEST_ONE_SHIFT(0, -30, s64, 0, true); 417 TEST_ONE_SHIFT(0, -30, u64, 0, true); 418 419 /* Overflow: shifted at or beyond entire type's bit width. */ 420 TEST_ONE_SHIFT(0, 8, u8, 0, true); 421 TEST_ONE_SHIFT(0, 9, u8, 0, true); 422 TEST_ONE_SHIFT(0, 8, s8, 0, true); 423 TEST_ONE_SHIFT(0, 9, s8, 0, true); 424 TEST_ONE_SHIFT(0, 16, u16, 0, true); 425 TEST_ONE_SHIFT(0, 17, u16, 0, true); 426 TEST_ONE_SHIFT(0, 16, s16, 0, true); 427 TEST_ONE_SHIFT(0, 17, s16, 0, true); 428 TEST_ONE_SHIFT(0, 32, u32, 0, true); 429 TEST_ONE_SHIFT(0, 33, u32, 0, true); 430 TEST_ONE_SHIFT(0, 32, int, 0, true); 431 TEST_ONE_SHIFT(0, 33, int, 0, true); 432 TEST_ONE_SHIFT(0, 32, s32, 0, true); 433 TEST_ONE_SHIFT(0, 33, s32, 0, true); 434 TEST_ONE_SHIFT(0, 64, u64, 0, true); 435 TEST_ONE_SHIFT(0, 65, u64, 0, true); 436 TEST_ONE_SHIFT(0, 64, s64, 0, true); 437 TEST_ONE_SHIFT(0, 65, s64, 0, true); 438 439 /* 440 * Corner case: for unsigned types, we fail when we've shifted 441 * through the entire width of bits. For signed types, we might 442 * want to match this behavior, but that would mean noticing if 443 * we shift through all but the signed bit, and this is not 444 * currently detected (but we'll notice an overflow into the 445 * signed bit). So, for now, we will test this condition but 446 * mark it as not expected to overflow. 447 */ 448 TEST_ONE_SHIFT(0, 7, s8, 0, false); 449 TEST_ONE_SHIFT(0, 15, s16, 0, false); 450 TEST_ONE_SHIFT(0, 31, int, 0, false); 451 TEST_ONE_SHIFT(0, 31, s32, 0, false); 452 TEST_ONE_SHIFT(0, 63, s64, 0, false); 453 454 kunit_info(test, "%d shift tests finished\n", count); 455 #undef TEST_ONE_SHIFT 456 } 457 458 /* 459 * Deal with the various forms of allocator arguments. See comments above 460 * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". 461 */ 462 #define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) 463 #define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) 464 #define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE) 465 #define alloc000(alloc, arg, sz) alloc(sz) 466 #define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) 467 #define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP) 468 #define free0(free, arg, ptr) free(ptr) 469 #define free1(free, arg, ptr) free(arg, ptr) 470 471 /* Wrap around to 16K */ 472 #define TEST_SIZE (5 * 4096) 473 474 #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ 475 static void test_ ## func (struct kunit *test, void *arg) \ 476 { \ 477 volatile size_t a = TEST_SIZE; \ 478 volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ 479 void *ptr; \ 480 \ 481 /* Tiny allocation test. */ \ 482 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ 483 KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ 484 #func " failed regular allocation?!\n"); \ 485 free ## want_arg (free_func, arg, ptr); \ 486 \ 487 /* Wrapped allocation test. */ \ 488 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ 489 a * b); \ 490 KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ 491 #func " unexpectedly failed bad wrapping?!\n"); \ 492 free ## want_arg (free_func, arg, ptr); \ 493 \ 494 /* Saturated allocation test. */ \ 495 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ 496 array_size(a, b)); \ 497 if (ptr) { \ 498 KUNIT_FAIL(test, #func " missed saturation!\n"); \ 499 free ## want_arg (free_func, arg, ptr); \ 500 } \ 501 } 502 503 /* 504 * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node()) 505 * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc()) 506 * Allocator uses a special leading argument + | | (e.g. devm_kmalloc()) 507 * | | | 508 */ 509 DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0); 510 DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1); 511 DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0); 512 DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1); 513 DEFINE_TEST_ALLOC(__vmalloc, vfree, 0, 1, 0); 514 DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0); 515 DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1); 516 DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0); 517 DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); 518 DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); 519 DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); 520 521 static void overflow_allocation_test(struct kunit *test) 522 { 523 const char device_name[] = "overflow-test"; 524 struct device *dev; 525 int count = 0; 526 527 #define check_allocation_overflow(alloc) do { \ 528 count++; \ 529 test_ ## alloc(test, dev); \ 530 } while (0) 531 532 /* Create dummy device for devm_kmalloc()-family tests. */ 533 dev = root_device_register(device_name); 534 KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), 535 "Cannot register test device\n"); 536 537 check_allocation_overflow(kmalloc); 538 check_allocation_overflow(kmalloc_node); 539 check_allocation_overflow(kzalloc); 540 check_allocation_overflow(kzalloc_node); 541 check_allocation_overflow(__vmalloc); 542 check_allocation_overflow(kvmalloc); 543 check_allocation_overflow(kvmalloc_node); 544 check_allocation_overflow(kvzalloc); 545 check_allocation_overflow(kvzalloc_node); 546 check_allocation_overflow(devm_kmalloc); 547 check_allocation_overflow(devm_kzalloc); 548 549 device_unregister(dev); 550 551 kunit_info(test, "%d allocation overflow tests finished\n", count); 552 #undef check_allocation_overflow 553 } 554 555 struct __test_flex_array { 556 unsigned long flags; 557 size_t count; 558 unsigned long data[]; 559 }; 560 561 static void overflow_size_helpers_test(struct kunit *test) 562 { 563 /* Make sure struct_size() can be used in a constant expression. */ 564 u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)]; 565 struct __test_flex_array *obj; 566 int count = 0; 567 int var; 568 volatile int unconst = 0; 569 570 /* Verify constant expression against runtime version. */ 571 var = 55; 572 OPTIMIZER_HIDE_VAR(var); 573 KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var)); 574 575 #define check_one_size_helper(expected, func, args...) do { \ 576 size_t _r = func(args); \ 577 KUNIT_EXPECT_EQ_MSG(test, _r, expected, \ 578 "expected " #func "(" #args ") to return %zu but got %zu instead\n", \ 579 (size_t)(expected), _r); \ 580 count++; \ 581 } while (0) 582 583 var = 4; 584 check_one_size_helper(20, size_mul, var++, 5); 585 check_one_size_helper(20, size_mul, 4, var++); 586 check_one_size_helper(0, size_mul, 0, 3); 587 check_one_size_helper(0, size_mul, 3, 0); 588 check_one_size_helper(6, size_mul, 2, 3); 589 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1); 590 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3); 591 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3); 592 593 var = 4; 594 check_one_size_helper(9, size_add, var++, 5); 595 check_one_size_helper(9, size_add, 4, var++); 596 check_one_size_helper(9, size_add, 9, 0); 597 check_one_size_helper(9, size_add, 0, 9); 598 check_one_size_helper(5, size_add, 2, 3); 599 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1); 600 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3); 601 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3); 602 603 var = 4; 604 check_one_size_helper(1, size_sub, var--, 3); 605 check_one_size_helper(1, size_sub, 4, var--); 606 check_one_size_helper(1, size_sub, 3, 2); 607 check_one_size_helper(9, size_sub, 9, 0); 608 check_one_size_helper(SIZE_MAX, size_sub, 9, -3); 609 check_one_size_helper(SIZE_MAX, size_sub, 0, 9); 610 check_one_size_helper(SIZE_MAX, size_sub, 2, 3); 611 check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0); 612 check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10); 613 check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX); 614 check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX); 615 check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1); 616 check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3); 617 check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3); 618 619 var = 4; 620 check_one_size_helper(4 * sizeof(*obj->data), 621 flex_array_size, obj, data, var++); 622 check_one_size_helper(5 * sizeof(*obj->data), 623 flex_array_size, obj, data, var++); 624 check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst); 625 check_one_size_helper(sizeof(*obj->data), 626 flex_array_size, obj, data, 1 + unconst); 627 check_one_size_helper(7 * sizeof(*obj->data), 628 flex_array_size, obj, data, 7 + unconst); 629 check_one_size_helper(SIZE_MAX, 630 flex_array_size, obj, data, -1 + unconst); 631 check_one_size_helper(SIZE_MAX, 632 flex_array_size, obj, data, SIZE_MAX - 4 + unconst); 633 634 var = 4; 635 check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)), 636 struct_size, obj, data, var++); 637 check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)), 638 struct_size, obj, data, var++); 639 check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst); 640 check_one_size_helper(sizeof(*obj) + sizeof(*obj->data), 641 struct_size, obj, data, 1 + unconst); 642 check_one_size_helper(SIZE_MAX, 643 struct_size, obj, data, -3 + unconst); 644 check_one_size_helper(SIZE_MAX, 645 struct_size, obj, data, SIZE_MAX - 3 + unconst); 646 647 kunit_info(test, "%d overflow size helper tests finished\n", count); 648 #undef check_one_size_helper 649 } 650 651 static struct kunit_case overflow_test_cases[] = { 652 KUNIT_CASE(u8_overflow_test), 653 KUNIT_CASE(s8_overflow_test), 654 KUNIT_CASE(u16_overflow_test), 655 KUNIT_CASE(s16_overflow_test), 656 KUNIT_CASE(u32_overflow_test), 657 KUNIT_CASE(s32_overflow_test), 658 /* Clang 13 and earlier generate unwanted libcalls on 32-bit. */ 659 #if BITS_PER_LONG == 64 660 KUNIT_CASE(u64_overflow_test), 661 KUNIT_CASE(s64_overflow_test), 662 #endif 663 KUNIT_CASE(overflow_shift_test), 664 KUNIT_CASE(overflow_allocation_test), 665 KUNIT_CASE(overflow_size_helpers_test), 666 {} 667 }; 668 669 static struct kunit_suite overflow_test_suite = { 670 .name = "overflow", 671 .test_cases = overflow_test_cases, 672 }; 673 674 kunit_test_suite(overflow_test_suite); 675 676 MODULE_LICENSE("Dual MIT/GPL"); 677