1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Test cases for compiler-based stack variable zeroing via 4 * -ftrivial-auto-var-init={zero,pattern}. 5 * For example, see: 6 * "Running tests with kunit_tool" at Documentation/dev-tools/kunit/start.rst 7 * ./tools/testing/kunit/kunit.py run stackinit [--raw_output] \ 8 * --make_option LLVM=1 \ 9 * --kconfig_add CONFIG_INIT_STACK_ALL_ZERO=y 10 * 11 */ 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <kunit/test.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/string.h> 19 20 /* Exfiltration buffer. */ 21 #define MAX_VAR_SIZE 128 22 static u8 check_buf[MAX_VAR_SIZE]; 23 24 /* Character array to trigger stack protector in all functions. */ 25 #define VAR_BUFFER 32 26 27 /* Volatile mask to convince compiler to copy memory with 0xff. */ 28 static volatile u8 forced_mask = 0xff; 29 30 /* Location and size tracking to validate fill and test are colocated. */ 31 static void *fill_start, *target_start; 32 static size_t fill_size, target_size; 33 34 static bool stackinit_range_contains(char *haystack_start, size_t haystack_size, 35 char *needle_start, size_t needle_size) 36 { 37 if (needle_start >= haystack_start && 38 needle_start + needle_size <= haystack_start + haystack_size) 39 return true; 40 return false; 41 } 42 43 /* Whether the test is expected to fail. */ 44 #define WANT_SUCCESS 0 45 #define XFAIL 1 46 47 #define DO_NOTHING_TYPE_SCALAR(var_type) var_type 48 #define DO_NOTHING_TYPE_STRING(var_type) void 49 #define DO_NOTHING_TYPE_STRUCT(var_type) void 50 #define DO_NOTHING_TYPE_UNION(var_type) void 51 52 #define DO_NOTHING_RETURN_SCALAR(ptr) *(ptr) 53 #define DO_NOTHING_RETURN_STRING(ptr) /**/ 54 #define DO_NOTHING_RETURN_STRUCT(ptr) /**/ 55 #define DO_NOTHING_RETURN_UNION(ptr) /**/ 56 57 #define DO_NOTHING_CALL_SCALAR(var, name) \ 58 (var) = do_nothing_ ## name(&(var)) 59 #define DO_NOTHING_CALL_STRING(var, name) \ 60 do_nothing_ ## name(var) 61 #define DO_NOTHING_CALL_STRUCT(var, name) \ 62 do_nothing_ ## name(&(var)) 63 #define DO_NOTHING_CALL_UNION(var, name) \ 64 do_nothing_ ## name(&(var)) 65 66 #define FETCH_ARG_SCALAR(var) &var 67 #define FETCH_ARG_STRING(var) var 68 #define FETCH_ARG_STRUCT(var) &var 69 #define FETCH_ARG_UNION(var) &var 70 71 /* 72 * On m68k, if the leaf function test variable is longer than 8 bytes, 73 * the start of the stack frame moves. 8 is sufficiently large to 74 * test m68k char arrays, but leave it at 16 for other architectures. 75 */ 76 #ifdef CONFIG_M68K 77 #define FILL_SIZE_STRING 8 78 #define FILL_SIZE_ARRAY 2 79 #else 80 #define FILL_SIZE_STRING 16 81 #define FILL_SIZE_ARRAY 8 82 #endif 83 84 #define INIT_CLONE_SCALAR /**/ 85 #define INIT_CLONE_STRING [FILL_SIZE_STRING] 86 #define INIT_CLONE_STRUCT /**/ 87 #define INIT_CLONE_UNION /**/ 88 89 #define ZERO_CLONE_SCALAR(zero) memset(&(zero), 0x00, sizeof(zero)) 90 #define ZERO_CLONE_STRING(zero) memset(&(zero), 0x00, sizeof(zero)) 91 /* 92 * For the struct, intentionally poison padding to see if it gets 93 * copied out in direct assignments. 94 * */ 95 #define ZERO_CLONE_STRUCT(zero) \ 96 do { \ 97 memset(&(zero), 0xFF, sizeof(zero)); \ 98 zero.one = 0; \ 99 zero.two = 0; \ 100 zero.three = 0; \ 101 zero.four = 0; \ 102 } while (0) 103 #define ZERO_CLONE_UNION(zero) ZERO_CLONE_STRUCT(zero) 104 105 #define INIT_SCALAR_none(var_type) /**/ 106 #define INIT_SCALAR_zero(var_type) = 0 107 108 #define INIT_STRING_none(var_type) [FILL_SIZE_STRING] /**/ 109 #define INIT_STRING_zero(var_type) [FILL_SIZE_STRING] = { } 110 111 #define INIT_STRUCT_none(var_type) /**/ 112 #define INIT_STRUCT_zero(var_type) = { } 113 #define INIT_STRUCT_old_zero(var_type) = { 0 } 114 115 116 #define __static_partial { .two = 0, } 117 #define __static_all { .one = 0, \ 118 .two = 0, \ 119 .three = 0, \ 120 .four = 0, \ 121 } 122 #define __dynamic_partial { .two = arg->two, } 123 #define __dynamic_all { .one = arg->one, \ 124 .two = arg->two, \ 125 .three = arg->three, \ 126 .four = arg->four, \ 127 } 128 #define __runtime_partial var.two = 0 129 #define __runtime_all var.one = 0; \ 130 var.two = 0; \ 131 var.three = 0; \ 132 var.four = 0 133 134 #define INIT_STRUCT_static_partial(var_type) \ 135 = __static_partial 136 #define INIT_STRUCT_static_all(var_type) \ 137 = __static_all 138 #define INIT_STRUCT_dynamic_partial(var_type) \ 139 = __dynamic_partial 140 #define INIT_STRUCT_dynamic_all(var_type) \ 141 = __dynamic_all 142 #define INIT_STRUCT_runtime_partial(var_type) \ 143 ; __runtime_partial 144 #define INIT_STRUCT_runtime_all(var_type) \ 145 ; __runtime_all 146 147 #define INIT_STRUCT_assigned_static_partial(var_type) \ 148 ; var = (var_type)__static_partial 149 #define INIT_STRUCT_assigned_static_all(var_type) \ 150 ; var = (var_type)__static_all 151 #define INIT_STRUCT_assigned_dynamic_partial(var_type) \ 152 ; var = (var_type)__dynamic_partial 153 #define INIT_STRUCT_assigned_dynamic_all(var_type) \ 154 ; var = (var_type)__dynamic_all 155 156 #define INIT_STRUCT_assigned_copy(var_type) \ 157 ; var = *(arg) 158 159 /* Union initialization is the same as structs. */ 160 #define INIT_UNION_none(var_type) INIT_STRUCT_none(var_type) 161 #define INIT_UNION_zero(var_type) INIT_STRUCT_zero(var_type) 162 #define INIT_UNION_old_zero(var_type) INIT_STRUCT_old_zero(var_type) 163 164 #define INIT_UNION_static_partial(var_type) \ 165 INIT_STRUCT_static_partial(var_type) 166 #define INIT_UNION_static_all(var_type) \ 167 INIT_STRUCT_static_all(var_type) 168 #define INIT_UNION_dynamic_partial(var_type) \ 169 INIT_STRUCT_dynamic_partial(var_type) 170 #define INIT_UNION_dynamic_all(var_type) \ 171 INIT_STRUCT_dynamic_all(var_type) 172 #define INIT_UNION_runtime_partial(var_type) \ 173 INIT_STRUCT_runtime_partial(var_type) 174 #define INIT_UNION_runtime_all(var_type) \ 175 INIT_STRUCT_runtime_all(var_type) 176 #define INIT_UNION_assigned_static_partial(var_type) \ 177 INIT_STRUCT_assigned_static_partial(var_type) 178 #define INIT_UNION_assigned_static_all(var_type) \ 179 INIT_STRUCT_assigned_static_all(var_type) 180 #define INIT_UNION_assigned_dynamic_partial(var_type) \ 181 INIT_STRUCT_assigned_dynamic_partial(var_type) 182 #define INIT_UNION_assigned_dynamic_all(var_type) \ 183 INIT_STRUCT_assigned_dynamic_all(var_type) 184 #define INIT_UNION_assigned_copy(var_type) \ 185 INIT_STRUCT_assigned_copy(var_type) 186 187 /* 188 * The "did we actually fill the stack?" check value needs 189 * to be neither 0 nor any of the "pattern" bytes. The 190 * pattern bytes are compiler, architecture, and type based, 191 * so we have to pick a value that never appears for those 192 * combinations. Use 0x99 which is not 0xFF, 0xFE, nor 0xAA. 193 */ 194 #define FILL_BYTE 0x99 195 196 /* 197 * @name: unique string name for the test 198 * @var_type: type to be tested for zeroing initialization 199 * @which: is this a SCALAR, STRING, or STRUCT type? 200 * @init_level: what kind of initialization is performed 201 * @xfail: is this test expected to fail? 202 */ 203 #define DEFINE_TEST_DRIVER(name, var_type, which, xfail) \ 204 /* Returns 0 on success, 1 on failure. */ \ 205 static noinline void test_ ## name (struct kunit *test) \ 206 { \ 207 var_type zero INIT_CLONE_ ## which; \ 208 int ignored; \ 209 u8 sum = 0, i; \ 210 \ 211 /* Notice when a new test is larger than expected. */ \ 212 BUILD_BUG_ON(sizeof(zero) > MAX_VAR_SIZE); \ 213 \ 214 /* Fill clone type with zero for per-field init. */ \ 215 ZERO_CLONE_ ## which(zero); \ 216 /* Clear entire check buffer for 0xFF overlap test. */ \ 217 memset(check_buf, 0x00, sizeof(check_buf)); \ 218 /* Fill stack with FILL_BYTE. */ \ 219 ignored = leaf_ ##name((unsigned long)&ignored, 1, \ 220 FETCH_ARG_ ## which(zero)); \ 221 /* Verify all bytes overwritten with FILL_BYTE. */ \ 222 for (sum = 0, i = 0; i < target_size; i++) \ 223 sum += (check_buf[i] != FILL_BYTE); \ 224 /* Clear entire check buffer for later bit tests. */ \ 225 memset(check_buf, 0x00, sizeof(check_buf)); \ 226 /* Extract stack-defined variable contents. */ \ 227 ignored = leaf_ ##name((unsigned long)&ignored, 0, \ 228 FETCH_ARG_ ## which(zero)); \ 229 /* \ 230 * Delay the sum test to here to do as little as \ 231 * possible between the two leaf function calls. \ 232 */ \ 233 KUNIT_ASSERT_EQ_MSG(test, sum, 0, \ 234 "leaf fill was not 0x%02X!?\n", \ 235 FILL_BYTE); \ 236 \ 237 /* Validate that compiler lined up fill and target. */ \ 238 KUNIT_ASSERT_TRUE_MSG(test, \ 239 stackinit_range_contains(fill_start, fill_size, \ 240 target_start, target_size), \ 241 "stackframe was not the same between calls!? " \ 242 "(fill %zu wide, target offset by %d)\n", \ 243 fill_size, \ 244 (int)((ssize_t)(uintptr_t)fill_start - \ 245 (ssize_t)(uintptr_t)target_start)); \ 246 \ 247 /* Validate check region has no FILL_BYTE bytes. */ \ 248 for (sum = 0, i = 0; i < target_size; i++) \ 249 sum += (check_buf[i] == FILL_BYTE); \ 250 \ 251 if (sum != 0 && xfail) \ 252 kunit_skip(test, \ 253 "XFAIL uninit bytes: %d\n", \ 254 sum); \ 255 KUNIT_ASSERT_EQ_MSG(test, sum, 0, \ 256 "uninit bytes: %d\n", sum); \ 257 } 258 #define DEFINE_TEST(name, var_type, which, init_level, xfail) \ 259 /* no-op to force compiler into ignoring "uninitialized" vars */\ 260 static noinline DO_NOTHING_TYPE_ ## which(var_type) \ 261 do_nothing_ ## name(var_type *ptr) \ 262 { \ 263 OPTIMIZER_HIDE_VAR(ptr); \ 264 /* Will always be true, but compiler doesn't know. */ \ 265 if ((unsigned long)ptr > 0x2) \ 266 return DO_NOTHING_RETURN_ ## which(ptr); \ 267 else \ 268 return DO_NOTHING_RETURN_ ## which(ptr + 1); \ 269 } \ 270 static noinline int leaf_ ## name(unsigned long sp, bool fill, \ 271 var_type *arg) \ 272 { \ 273 char buf[VAR_BUFFER]; \ 274 var_type var \ 275 INIT_ ## which ## _ ## init_level(var_type); \ 276 \ 277 target_start = &var; \ 278 target_size = sizeof(var); \ 279 /* \ 280 * Keep this buffer around to make sure we've got a \ 281 * stack frame of SOME kind... \ 282 */ \ 283 memset(buf, (char)(sp & 0xff), sizeof(buf)); \ 284 /* Fill variable with FILL_BYTE. */ \ 285 if (fill) { \ 286 fill_start = &var; \ 287 fill_size = sizeof(var); \ 288 memset(fill_start, \ 289 FILL_BYTE & forced_mask, \ 290 fill_size); \ 291 } \ 292 \ 293 /* Silence "never initialized" warnings. */ \ 294 DO_NOTHING_CALL_ ## which(var, name); \ 295 \ 296 /* Exfiltrate "var". */ \ 297 memcpy(check_buf, target_start, target_size); \ 298 \ 299 return (int)buf[0] | (int)buf[sizeof(buf) - 1]; \ 300 } \ 301 DEFINE_TEST_DRIVER(name, var_type, which, xfail) 302 303 /* Structure with no padding. */ 304 struct test_packed { 305 unsigned long one; 306 unsigned long two; 307 unsigned long three; 308 unsigned long four; 309 }; 310 311 /* Simple structure with padding likely to be covered by compiler. */ 312 struct test_small_hole { 313 size_t one; 314 char two; 315 /* 3 byte padding hole here. */ 316 int three; 317 unsigned long four; 318 }; 319 320 /* Trigger unhandled padding in a structure. */ 321 struct test_big_hole { 322 u8 one; 323 u8 two; 324 u8 three; 325 /* 61 byte padding hole here. */ 326 u8 four __aligned(64); 327 } __aligned(64); 328 329 struct test_trailing_hole { 330 char *one; 331 char *two; 332 char *three; 333 char four; 334 /* "sizeof(unsigned long) - 1" byte padding hole here. */ 335 }; 336 337 /* Test if STRUCTLEAK is clearing structs with __user fields. */ 338 struct test_user { 339 u8 one; 340 unsigned long two; 341 char __user *three; 342 unsigned long four; 343 }; 344 345 /* No padding: all members are the same size. */ 346 union test_same_sizes { 347 unsigned long one; 348 unsigned long two; 349 unsigned long three; 350 unsigned long four; 351 }; 352 353 /* Mismatched sizes, with one and two being small */ 354 union test_small_start { 355 char one:1; 356 char two; 357 short three; 358 unsigned long four; 359 struct big_struct { 360 unsigned long array[FILL_SIZE_ARRAY]; 361 } big; 362 }; 363 364 /* Mismatched sizes, with three and four being small */ 365 union test_small_end { 366 short one; 367 unsigned long two; 368 char three:1; 369 char four; 370 }; 371 372 #define ALWAYS_PASS WANT_SUCCESS 373 #define ALWAYS_FAIL XFAIL 374 375 #ifdef CONFIG_INIT_STACK_NONE 376 # define INSTRUMENTED_PASS XFAIL 377 #else 378 # define INSTRUMENTED_PASS WANT_SUCCESS 379 #endif 380 381 /* 382 * Clang 24 and later emit initialization on the jumps that bypass the 383 * declaration. GCC still initializes only at the declaration. Track 384 * test expectation based on CONFIG_INIT_STACK_NONE above. 385 */ 386 #if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION >= 240000 387 # define BYPASS_PASS INSTRUMENTED_PASS 388 #else 389 # define BYPASS_PASS XFAIL 390 #endif 391 392 #define DEFINE_SCALAR_TEST(name, init, xfail) \ 393 DEFINE_TEST(name ## _ ## init, name, SCALAR, \ 394 init, xfail) 395 396 #define DEFINE_SCALAR_TESTS(init, xfail) \ 397 DEFINE_SCALAR_TEST(u8, init, xfail); \ 398 DEFINE_SCALAR_TEST(u16, init, xfail); \ 399 DEFINE_SCALAR_TEST(u32, init, xfail); \ 400 DEFINE_SCALAR_TEST(u64, init, xfail); \ 401 DEFINE_TEST(char_array_ ## init, unsigned char, \ 402 STRING, init, xfail) 403 404 #define DEFINE_STRUCT_TEST(name, init, xfail) \ 405 DEFINE_TEST(name ## _ ## init, \ 406 struct test_ ## name, STRUCT, init, \ 407 xfail) 408 409 #define DEFINE_UNION_TEST(name, init, xfail) \ 410 DEFINE_TEST(name ## _ ## init, \ 411 union test_ ## name, STRUCT, init, \ 412 xfail) 413 414 #define DEFINE_STRUCT_TESTS(init, xfail) \ 415 DEFINE_STRUCT_TEST(small_hole, init, xfail); \ 416 DEFINE_STRUCT_TEST(big_hole, init, xfail); \ 417 DEFINE_STRUCT_TEST(trailing_hole, init, xfail); \ 418 DEFINE_STRUCT_TEST(packed, init, xfail) 419 420 #define DEFINE_STRUCT_INITIALIZER_TESTS(base, xfail) \ 421 DEFINE_STRUCT_TESTS(base ## _ ## partial, \ 422 xfail); \ 423 DEFINE_STRUCT_TESTS(base ## _ ## all, xfail) 424 425 #define DEFINE_UNION_INITIALIZER_TESTS(base, xfail) \ 426 DEFINE_UNION_TESTS(base ## _ ## partial, \ 427 xfail); \ 428 DEFINE_UNION_TESTS(base ## _ ## all, xfail) 429 430 #define DEFINE_UNION_TESTS(init, xfail) \ 431 DEFINE_UNION_TEST(same_sizes, init, xfail); \ 432 DEFINE_UNION_TEST(small_start, init, xfail); \ 433 DEFINE_UNION_TEST(small_end, init, xfail); 434 435 /* These should be fully initialized all the time! */ 436 DEFINE_SCALAR_TESTS(zero, ALWAYS_PASS); 437 DEFINE_STRUCT_TESTS(zero, ALWAYS_PASS); 438 DEFINE_STRUCT_TESTS(old_zero, ALWAYS_PASS); 439 DEFINE_UNION_TESTS(zero, ALWAYS_PASS); 440 DEFINE_UNION_TESTS(old_zero, ALWAYS_PASS); 441 /* Struct initializers: padding may be left uninitialized. */ 442 DEFINE_STRUCT_INITIALIZER_TESTS(static, INSTRUMENTED_PASS); 443 DEFINE_STRUCT_INITIALIZER_TESTS(dynamic, INSTRUMENTED_PASS); 444 DEFINE_STRUCT_INITIALIZER_TESTS(runtime, INSTRUMENTED_PASS); 445 DEFINE_STRUCT_INITIALIZER_TESTS(assigned_static, INSTRUMENTED_PASS); 446 DEFINE_STRUCT_INITIALIZER_TESTS(assigned_dynamic, INSTRUMENTED_PASS); 447 DEFINE_STRUCT_TESTS(assigned_copy, ALWAYS_FAIL); 448 DEFINE_UNION_INITIALIZER_TESTS(static, INSTRUMENTED_PASS); 449 DEFINE_UNION_INITIALIZER_TESTS(dynamic, INSTRUMENTED_PASS); 450 DEFINE_UNION_INITIALIZER_TESTS(runtime, INSTRUMENTED_PASS); 451 DEFINE_UNION_INITIALIZER_TESTS(assigned_static, INSTRUMENTED_PASS); 452 DEFINE_UNION_INITIALIZER_TESTS(assigned_dynamic, INSTRUMENTED_PASS); 453 DEFINE_UNION_TESTS(assigned_copy, ALWAYS_FAIL); 454 /* No initialization without compiler instrumentation. */ 455 DEFINE_SCALAR_TESTS(none, INSTRUMENTED_PASS); 456 DEFINE_STRUCT_TESTS(none, INSTRUMENTED_PASS); 457 /* Initialization of members with __user attribute. */ 458 DEFINE_TEST(user, struct test_user, STRUCT, none, INSTRUMENTED_PASS); 459 460 /* 461 * Check two uses through a variable declaration outside either path, 462 * which was noticed as a special case in porting earlier stack init 463 * compiler logic. 464 */ 465 static int noinline __leaf_switch_none(int path, bool fill) 466 { 467 switch (path) { 468 /* 469 * This is intentionally unreachable. To silence the 470 * warning, build with -Wno-switch-unreachable 471 */ 472 uint64_t var[10]; 473 474 case 1: 475 target_start = &var; 476 target_size = sizeof(var); 477 if (fill) { 478 fill_start = &var; 479 fill_size = sizeof(var); 480 481 memset(fill_start, (forced_mask | 0x55) & FILL_BYTE, fill_size); 482 } 483 memcpy(check_buf, target_start, target_size); 484 break; 485 case 2: 486 target_start = &var; 487 target_size = sizeof(var); 488 if (fill) { 489 fill_start = &var; 490 fill_size = sizeof(var); 491 492 memset(fill_start, (forced_mask | 0xaa) & FILL_BYTE, fill_size); 493 } 494 memcpy(check_buf, target_start, target_size); 495 break; 496 default: 497 var[1] = 5; 498 return var[1] & forced_mask; 499 } 500 return 0; 501 } 502 503 static noinline int __leaf_goto_none(bool fill) 504 { 505 goto bypass; 506 /* 507 * This declaration is jumped over by the goto above, so it is 508 * never reached. Compilers that initialize only at the point of 509 * declaration leave this variable untouched. 510 */ 511 uint64_t var[10]; 512 513 bypass: 514 target_start = &var; 515 target_size = sizeof(var); 516 if (fill) { 517 fill_start = &var; 518 fill_size = sizeof(var); 519 520 memset(fill_start, (forced_mask | 0x55) & FILL_BYTE, fill_size); 521 } 522 memcpy(check_buf, target_start, target_size); 523 524 return 0; 525 } 526 527 static noinline int leaf_goto_none(unsigned long sp, bool fill, 528 uint64_t *arg) 529 { 530 return __leaf_goto_none(fill); 531 } 532 533 static noinline int leaf_switch_1_none(unsigned long sp, bool fill, 534 uint64_t *arg) 535 { 536 return __leaf_switch_none(1, fill); 537 } 538 539 static noinline int leaf_switch_2_none(unsigned long sp, bool fill, 540 uint64_t *arg) 541 { 542 return __leaf_switch_none(2, fill); 543 } 544 545 /* 546 * A declaration whose definition point is jumped over, either by a switch 547 * dispatch reaching a "case" label below it or by a goto, used to be left 548 * uninitialized: the initialization is emitted where the variable is 549 * declared, and that point is never reached. 550 */ 551 DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, BYPASS_PASS); 552 DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, BYPASS_PASS); 553 DEFINE_TEST_DRIVER(goto_none, uint64_t, SCALAR, BYPASS_PASS); 554 555 #define KUNIT_test_scalars(init) \ 556 KUNIT_CASE(test_u8_ ## init), \ 557 KUNIT_CASE(test_u16_ ## init), \ 558 KUNIT_CASE(test_u32_ ## init), \ 559 KUNIT_CASE(test_u64_ ## init), \ 560 KUNIT_CASE(test_char_array_ ## init) 561 562 #define KUNIT_test_structs(init) \ 563 KUNIT_CASE(test_small_hole_ ## init), \ 564 KUNIT_CASE(test_big_hole_ ## init), \ 565 KUNIT_CASE(test_trailing_hole_ ## init),\ 566 KUNIT_CASE(test_packed_ ## init) \ 567 568 #define KUNIT_test_unions(init) \ 569 KUNIT_CASE(test_same_sizes_ ## init), \ 570 KUNIT_CASE(test_small_start_ ## init), \ 571 KUNIT_CASE(test_small_end_ ## init) \ 572 573 static struct kunit_case stackinit_test_cases[] = { 574 /* These are explicitly initialized and should always pass. */ 575 KUNIT_test_scalars(zero), 576 KUNIT_test_structs(zero), 577 KUNIT_test_structs(old_zero), 578 KUNIT_test_unions(zero), 579 KUNIT_test_unions(old_zero), 580 /* Padding here appears to be accidentally always initialized? */ 581 KUNIT_test_structs(dynamic_partial), 582 KUNIT_test_structs(assigned_dynamic_partial), 583 KUNIT_test_unions(dynamic_partial), 584 KUNIT_test_unions(assigned_dynamic_partial), 585 /* Padding initialization depends on compiler behaviors. */ 586 KUNIT_test_structs(static_partial), 587 KUNIT_test_structs(static_all), 588 KUNIT_test_structs(dynamic_all), 589 KUNIT_test_structs(runtime_partial), 590 KUNIT_test_structs(runtime_all), 591 KUNIT_test_structs(assigned_static_partial), 592 KUNIT_test_structs(assigned_static_all), 593 KUNIT_test_structs(assigned_dynamic_all), 594 KUNIT_test_unions(static_partial), 595 KUNIT_test_unions(static_all), 596 KUNIT_test_unions(dynamic_all), 597 KUNIT_test_unions(runtime_partial), 598 KUNIT_test_unions(runtime_all), 599 KUNIT_test_unions(assigned_static_partial), 600 KUNIT_test_unions(assigned_static_all), 601 KUNIT_test_unions(assigned_dynamic_all), 602 /* Everything fails this since it effectively performs a memcpy(). */ 603 KUNIT_test_structs(assigned_copy), 604 KUNIT_test_unions(assigned_copy), 605 /* STRUCTLEAK_BYREF_ALL should cover everything from here down. */ 606 KUNIT_test_scalars(none), 607 KUNIT_CASE(test_switch_1_none), 608 KUNIT_CASE(test_switch_2_none), 609 KUNIT_CASE(test_goto_none), 610 /* STRUCTLEAK_BYREF should cover from here down. */ 611 KUNIT_test_structs(none), 612 /* STRUCTLEAK will only cover this. */ 613 KUNIT_CASE(test_user), 614 {} 615 }; 616 617 static struct kunit_suite stackinit_test_suite = { 618 .name = "stackinit", 619 .test_cases = stackinit_test_cases, 620 }; 621 622 kunit_test_suites(&stackinit_test_suite); 623 624 MODULE_DESCRIPTION("Test cases for compiler-based stack variable zeroing"); 625 MODULE_LICENSE("GPL"); 626