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} or CONFIG_GCC_PLUGIN_STRUCTLEAK*.
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
stackinit_range_contains(char * haystack_start,size_t haystack_size,char * needle_start,size_t needle_size)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 USER_PASS XFAIL
377 # define BYREF_PASS XFAIL
378 # define STRONG_PASS XFAIL
379 #elif defined(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)
380 # define USER_PASS WANT_SUCCESS
381 # define BYREF_PASS XFAIL
382 # define STRONG_PASS XFAIL
383 #elif defined(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)
384 # define USER_PASS WANT_SUCCESS
385 # define BYREF_PASS WANT_SUCCESS
386 # define STRONG_PASS XFAIL
387 #else
388 # define USER_PASS WANT_SUCCESS
389 # define BYREF_PASS WANT_SUCCESS
390 # define STRONG_PASS WANT_SUCCESS
391 #endif
392
393 #define DEFINE_SCALAR_TEST(name, init, xfail) \
394 DEFINE_TEST(name ## _ ## init, name, SCALAR, \
395 init, xfail)
396
397 #define DEFINE_SCALAR_TESTS(init, xfail) \
398 DEFINE_SCALAR_TEST(u8, init, xfail); \
399 DEFINE_SCALAR_TEST(u16, init, xfail); \
400 DEFINE_SCALAR_TEST(u32, init, xfail); \
401 DEFINE_SCALAR_TEST(u64, init, xfail); \
402 DEFINE_TEST(char_array_ ## init, unsigned char, \
403 STRING, init, xfail)
404
405 #define DEFINE_STRUCT_TEST(name, init, xfail) \
406 DEFINE_TEST(name ## _ ## init, \
407 struct test_ ## name, STRUCT, init, \
408 xfail)
409
410 #define DEFINE_UNION_TEST(name, init, xfail) \
411 DEFINE_TEST(name ## _ ## init, \
412 union test_ ## name, STRUCT, init, \
413 xfail)
414
415 #define DEFINE_STRUCT_TESTS(init, xfail) \
416 DEFINE_STRUCT_TEST(small_hole, init, xfail); \
417 DEFINE_STRUCT_TEST(big_hole, init, xfail); \
418 DEFINE_STRUCT_TEST(trailing_hole, init, xfail); \
419 DEFINE_STRUCT_TEST(packed, init, xfail)
420
421 #define DEFINE_STRUCT_INITIALIZER_TESTS(base, xfail) \
422 DEFINE_STRUCT_TESTS(base ## _ ## partial, \
423 xfail); \
424 DEFINE_STRUCT_TESTS(base ## _ ## all, xfail)
425
426 #define DEFINE_UNION_INITIALIZER_TESTS(base, xfail) \
427 DEFINE_UNION_TESTS(base ## _ ## partial, \
428 xfail); \
429 DEFINE_UNION_TESTS(base ## _ ## all, xfail)
430
431 #define DEFINE_UNION_TESTS(init, xfail) \
432 DEFINE_UNION_TEST(same_sizes, init, xfail); \
433 DEFINE_UNION_TEST(small_start, init, xfail); \
434 DEFINE_UNION_TEST(small_end, init, xfail);
435
436 /* These should be fully initialized all the time! */
437 DEFINE_SCALAR_TESTS(zero, ALWAYS_PASS);
438 DEFINE_STRUCT_TESTS(zero, ALWAYS_PASS);
439 DEFINE_STRUCT_TESTS(old_zero, ALWAYS_PASS);
440 DEFINE_UNION_TESTS(zero, ALWAYS_PASS);
441 DEFINE_UNION_TESTS(old_zero, ALWAYS_PASS);
442 /* Struct initializers: padding may be left uninitialized. */
443 DEFINE_STRUCT_INITIALIZER_TESTS(static, STRONG_PASS);
444 DEFINE_STRUCT_INITIALIZER_TESTS(dynamic, STRONG_PASS);
445 DEFINE_STRUCT_INITIALIZER_TESTS(runtime, STRONG_PASS);
446 DEFINE_STRUCT_INITIALIZER_TESTS(assigned_static, STRONG_PASS);
447 DEFINE_STRUCT_INITIALIZER_TESTS(assigned_dynamic, STRONG_PASS);
448 DEFINE_STRUCT_TESTS(assigned_copy, ALWAYS_FAIL);
449 DEFINE_UNION_INITIALIZER_TESTS(static, STRONG_PASS);
450 DEFINE_UNION_INITIALIZER_TESTS(dynamic, STRONG_PASS);
451 DEFINE_UNION_INITIALIZER_TESTS(runtime, STRONG_PASS);
452 DEFINE_UNION_INITIALIZER_TESTS(assigned_static, STRONG_PASS);
453 DEFINE_UNION_INITIALIZER_TESTS(assigned_dynamic, STRONG_PASS);
454 DEFINE_UNION_TESTS(assigned_copy, ALWAYS_FAIL);
455 /* No initialization without compiler instrumentation. */
456 DEFINE_SCALAR_TESTS(none, STRONG_PASS);
457 DEFINE_STRUCT_TESTS(none, BYREF_PASS);
458 /* Initialization of members with __user attribute. */
459 DEFINE_TEST(user, struct test_user, STRUCT, none, USER_PASS);
460
461 /*
462 * Check two uses through a variable declaration outside either path,
463 * which was noticed as a special case in porting earlier stack init
464 * compiler logic.
465 */
__leaf_switch_none(int path,bool fill)466 static int noinline __leaf_switch_none(int path, bool fill)
467 {
468 switch (path) {
469 /*
470 * This is intentionally unreachable. To silence the
471 * warning, build with -Wno-switch-unreachable
472 */
473 uint64_t var[10];
474
475 case 1:
476 target_start = &var;
477 target_size = sizeof(var);
478 if (fill) {
479 fill_start = &var;
480 fill_size = sizeof(var);
481
482 memset(fill_start, (forced_mask | 0x55) & FILL_BYTE, fill_size);
483 }
484 memcpy(check_buf, target_start, target_size);
485 break;
486 case 2:
487 target_start = &var;
488 target_size = sizeof(var);
489 if (fill) {
490 fill_start = &var;
491 fill_size = sizeof(var);
492
493 memset(fill_start, (forced_mask | 0xaa) & FILL_BYTE, fill_size);
494 }
495 memcpy(check_buf, target_start, target_size);
496 break;
497 default:
498 var[1] = 5;
499 return var[1] & forced_mask;
500 }
501 return 0;
502 }
503
leaf_switch_1_none(unsigned long sp,bool fill,uint64_t * arg)504 static noinline int leaf_switch_1_none(unsigned long sp, bool fill,
505 uint64_t *arg)
506 {
507 return __leaf_switch_none(1, fill);
508 }
509
leaf_switch_2_none(unsigned long sp,bool fill,uint64_t * arg)510 static noinline int leaf_switch_2_none(unsigned long sp, bool fill,
511 uint64_t *arg)
512 {
513 return __leaf_switch_none(2, fill);
514 }
515
516 /*
517 * These are expected to fail for most configurations because neither
518 * GCC nor Clang have a way to perform initialization of variables in
519 * non-code areas (i.e. in a switch statement before the first "case").
520 * https://llvm.org/pr44916
521 */
522 DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, ALWAYS_FAIL);
523 DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, ALWAYS_FAIL);
524
525 #define KUNIT_test_scalars(init) \
526 KUNIT_CASE(test_u8_ ## init), \
527 KUNIT_CASE(test_u16_ ## init), \
528 KUNIT_CASE(test_u32_ ## init), \
529 KUNIT_CASE(test_u64_ ## init), \
530 KUNIT_CASE(test_char_array_ ## init)
531
532 #define KUNIT_test_structs(init) \
533 KUNIT_CASE(test_small_hole_ ## init), \
534 KUNIT_CASE(test_big_hole_ ## init), \
535 KUNIT_CASE(test_trailing_hole_ ## init),\
536 KUNIT_CASE(test_packed_ ## init) \
537
538 #define KUNIT_test_unions(init) \
539 KUNIT_CASE(test_same_sizes_ ## init), \
540 KUNIT_CASE(test_small_start_ ## init), \
541 KUNIT_CASE(test_small_end_ ## init) \
542
543 static struct kunit_case stackinit_test_cases[] = {
544 /* These are explicitly initialized and should always pass. */
545 KUNIT_test_scalars(zero),
546 KUNIT_test_structs(zero),
547 KUNIT_test_structs(old_zero),
548 KUNIT_test_unions(zero),
549 KUNIT_test_unions(old_zero),
550 /* Padding here appears to be accidentally always initialized? */
551 KUNIT_test_structs(dynamic_partial),
552 KUNIT_test_structs(assigned_dynamic_partial),
553 KUNIT_test_unions(dynamic_partial),
554 KUNIT_test_unions(assigned_dynamic_partial),
555 /* Padding initialization depends on compiler behaviors. */
556 KUNIT_test_structs(static_partial),
557 KUNIT_test_structs(static_all),
558 KUNIT_test_structs(dynamic_all),
559 KUNIT_test_structs(runtime_partial),
560 KUNIT_test_structs(runtime_all),
561 KUNIT_test_structs(assigned_static_partial),
562 KUNIT_test_structs(assigned_static_all),
563 KUNIT_test_structs(assigned_dynamic_all),
564 KUNIT_test_unions(static_partial),
565 KUNIT_test_unions(static_all),
566 KUNIT_test_unions(dynamic_all),
567 KUNIT_test_unions(runtime_partial),
568 KUNIT_test_unions(runtime_all),
569 KUNIT_test_unions(assigned_static_partial),
570 KUNIT_test_unions(assigned_static_all),
571 KUNIT_test_unions(assigned_dynamic_all),
572 /* Everything fails this since it effectively performs a memcpy(). */
573 KUNIT_test_structs(assigned_copy),
574 KUNIT_test_unions(assigned_copy),
575 /* STRUCTLEAK_BYREF_ALL should cover everything from here down. */
576 KUNIT_test_scalars(none),
577 KUNIT_CASE(test_switch_1_none),
578 KUNIT_CASE(test_switch_2_none),
579 /* STRUCTLEAK_BYREF should cover from here down. */
580 KUNIT_test_structs(none),
581 /* STRUCTLEAK will only cover this. */
582 KUNIT_CASE(test_user),
583 {}
584 };
585
586 static struct kunit_suite stackinit_test_suite = {
587 .name = "stackinit",
588 .test_cases = stackinit_test_cases,
589 };
590
591 kunit_test_suites(&stackinit_test_suite);
592
593 MODULE_DESCRIPTION("Test cases for compiler-based stack variable zeroing");
594 MODULE_LICENSE("GPL");
595