stackinit_kunit.c

  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
 22static 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. */
 28static volatile u8 forced_mask = 0xff;
 29
 30/* Location and size tracking to validate fill and test are colocated. */
 31static void *fill_start, *target_start;
 32static size_t fill_size, target_size;
 33
 34static 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. */			\
205static 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 */\
260static noinline DO_NOTHING_TYPE_ ## which(var_type)		\
261do_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}								\
270static 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}								\
301DEFINE_TEST_DRIVER(name, var_type, which, xfail)
302
303/* Structure with no padding. */
304struct 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. */
312struct 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. */
321struct 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
329struct 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. */
338struct 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. */
346union 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 */
354union 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 */
365union 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#else
380# define USER_PASS	WANT_SUCCESS
381# define BYREF_PASS	WANT_SUCCESS
382# define STRONG_PASS	WANT_SUCCESS
383#endif
384
385#define DEFINE_SCALAR_TEST(name, init, xfail)			\
386		DEFINE_TEST(name ## _ ## init, name, SCALAR,	\
387			    init, xfail)
388
389#define DEFINE_SCALAR_TESTS(init, xfail)			\
390		DEFINE_SCALAR_TEST(u8, init, xfail);		\
391		DEFINE_SCALAR_TEST(u16, init, xfail);		\
392		DEFINE_SCALAR_TEST(u32, init, xfail);		\
393		DEFINE_SCALAR_TEST(u64, init, xfail);		\
394		DEFINE_TEST(char_array_ ## init, unsigned char,	\
395			    STRING, init, xfail)
396
397#define DEFINE_STRUCT_TEST(name, init, xfail)			\
398		DEFINE_TEST(name ## _ ## init,			\
399			    struct test_ ## name, STRUCT, init, \
400			    xfail)
401
402#define DEFINE_UNION_TEST(name, init, xfail)			\
403		DEFINE_TEST(name ## _ ## init,			\
404			    union test_ ## name, STRUCT, init,	\
405			    xfail)
406
407#define DEFINE_STRUCT_TESTS(init, xfail)			\
408		DEFINE_STRUCT_TEST(small_hole, init, xfail);	\
409		DEFINE_STRUCT_TEST(big_hole, init, xfail);	\
410		DEFINE_STRUCT_TEST(trailing_hole, init, xfail);	\
411		DEFINE_STRUCT_TEST(packed, init, xfail)
412
413#define DEFINE_STRUCT_INITIALIZER_TESTS(base, xfail)		\
414		DEFINE_STRUCT_TESTS(base ## _ ## partial,	\
415				    xfail);			\
416		DEFINE_STRUCT_TESTS(base ## _ ## all, xfail)
417
418#define DEFINE_UNION_INITIALIZER_TESTS(base, xfail)		\
419		DEFINE_UNION_TESTS(base ## _ ## partial,	\
420				    xfail);			\
421		DEFINE_UNION_TESTS(base ## _ ## all, xfail)
422
423#define DEFINE_UNION_TESTS(init, xfail)				\
424		DEFINE_UNION_TEST(same_sizes, init, xfail);	\
425		DEFINE_UNION_TEST(small_start, init, xfail);	\
426		DEFINE_UNION_TEST(small_end, init, xfail);
427
428/* These should be fully initialized all the time! */
429DEFINE_SCALAR_TESTS(zero, ALWAYS_PASS);
430DEFINE_STRUCT_TESTS(zero, ALWAYS_PASS);
431DEFINE_STRUCT_TESTS(old_zero, ALWAYS_PASS);
432DEFINE_UNION_TESTS(zero, ALWAYS_PASS);
433DEFINE_UNION_TESTS(old_zero, ALWAYS_PASS);
434/* Struct initializers: padding may be left uninitialized. */
435DEFINE_STRUCT_INITIALIZER_TESTS(static, STRONG_PASS);
436DEFINE_STRUCT_INITIALIZER_TESTS(dynamic, STRONG_PASS);
437DEFINE_STRUCT_INITIALIZER_TESTS(runtime, STRONG_PASS);
438DEFINE_STRUCT_INITIALIZER_TESTS(assigned_static, STRONG_PASS);
439DEFINE_STRUCT_INITIALIZER_TESTS(assigned_dynamic, STRONG_PASS);
440DEFINE_STRUCT_TESTS(assigned_copy, ALWAYS_FAIL);
441DEFINE_UNION_INITIALIZER_TESTS(static, STRONG_PASS);
442DEFINE_UNION_INITIALIZER_TESTS(dynamic, STRONG_PASS);
443DEFINE_UNION_INITIALIZER_TESTS(runtime, STRONG_PASS);
444DEFINE_UNION_INITIALIZER_TESTS(assigned_static, STRONG_PASS);
445DEFINE_UNION_INITIALIZER_TESTS(assigned_dynamic, STRONG_PASS);
446DEFINE_UNION_TESTS(assigned_copy, ALWAYS_FAIL);
447/* No initialization without compiler instrumentation. */
448DEFINE_SCALAR_TESTS(none, STRONG_PASS);
449DEFINE_STRUCT_TESTS(none, BYREF_PASS);
450/* Initialization of members with __user attribute. */
451DEFINE_TEST(user, struct test_user, STRUCT, none, USER_PASS);
452
453/*
454 * Check two uses through a variable declaration outside either path,
455 * which was noticed as a special case in porting earlier stack init
456 * compiler logic.
457 */
458static int noinline __leaf_switch_none(int path, bool fill)
459{
460	switch (path) {
461		/*
462		 * This is intentionally unreachable. To silence the
463		 * warning, build with -Wno-switch-unreachable
464		 */
465		uint64_t var[10];
466
467	case 1:
468		target_start = &var;
469		target_size = sizeof(var);
470		if (fill) {
471			fill_start = &var;
472			fill_size = sizeof(var);
473
474			memset(fill_start, (forced_mask | 0x55) & FILL_BYTE, fill_size);
475		}
476		memcpy(check_buf, target_start, target_size);
477		break;
478	case 2:
479		target_start = &var;
480		target_size = sizeof(var);
481		if (fill) {
482			fill_start = &var;
483			fill_size = sizeof(var);
484
485			memset(fill_start, (forced_mask | 0xaa) & FILL_BYTE, fill_size);
486		}
487		memcpy(check_buf, target_start, target_size);
488		break;
489	default:
490		var[1] = 5;
491		return var[1] & forced_mask;
492	}
493	return 0;
494}
495
496static noinline int leaf_switch_1_none(unsigned long sp, bool fill,
497					      uint64_t *arg)
498{
499	return __leaf_switch_none(1, fill);
500}
501
502static noinline int leaf_switch_2_none(unsigned long sp, bool fill,
503					      uint64_t *arg)
504{
505	return __leaf_switch_none(2, fill);
506}
507
508/*
509 * These are expected to fail for most configurations because neither
510 * GCC nor Clang have a way to perform initialization of variables in
511 * non-code areas (i.e. in a switch statement before the first "case").
512 * https://llvm.org/pr44916
513 */
514DEFINE_TEST_DRIVER(switch_1_none, uint64_t, SCALAR, ALWAYS_FAIL);
515DEFINE_TEST_DRIVER(switch_2_none, uint64_t, SCALAR, ALWAYS_FAIL);
516
517#define KUNIT_test_scalars(init)			\
518		KUNIT_CASE(test_u8_ ## init),		\
519		KUNIT_CASE(test_u16_ ## init),		\
520		KUNIT_CASE(test_u32_ ## init),		\
521		KUNIT_CASE(test_u64_ ## init),		\
522		KUNIT_CASE(test_char_array_ ## init)
523
524#define KUNIT_test_structs(init)			\
525		KUNIT_CASE(test_small_hole_ ## init),	\
526		KUNIT_CASE(test_big_hole_ ## init),	\
527		KUNIT_CASE(test_trailing_hole_ ## init),\
528		KUNIT_CASE(test_packed_ ## init)	\
529
530#define KUNIT_test_unions(init)				\
531		KUNIT_CASE(test_same_sizes_ ## init),	\
532		KUNIT_CASE(test_small_start_ ## init),	\
533		KUNIT_CASE(test_small_end_ ## init)	\
534
535static struct kunit_case stackinit_test_cases[] = {
536	/* These are explicitly initialized and should always pass. */
537	KUNIT_test_scalars(zero),
538	KUNIT_test_structs(zero),
539	KUNIT_test_structs(old_zero),
540	KUNIT_test_unions(zero),
541	KUNIT_test_unions(old_zero),
542	/* Padding here appears to be accidentally always initialized? */
543	KUNIT_test_structs(dynamic_partial),
544	KUNIT_test_structs(assigned_dynamic_partial),
545	KUNIT_test_unions(dynamic_partial),
546	KUNIT_test_unions(assigned_dynamic_partial),
547	/* Padding initialization depends on compiler behaviors. */
548	KUNIT_test_structs(static_partial),
549	KUNIT_test_structs(static_all),
550	KUNIT_test_structs(dynamic_all),
551	KUNIT_test_structs(runtime_partial),
552	KUNIT_test_structs(runtime_all),
553	KUNIT_test_structs(assigned_static_partial),
554	KUNIT_test_structs(assigned_static_all),
555	KUNIT_test_structs(assigned_dynamic_all),
556	KUNIT_test_unions(static_partial),
557	KUNIT_test_unions(static_all),
558	KUNIT_test_unions(dynamic_all),
559	KUNIT_test_unions(runtime_partial),
560	KUNIT_test_unions(runtime_all),
561	KUNIT_test_unions(assigned_static_partial),
562	KUNIT_test_unions(assigned_static_all),
563	KUNIT_test_unions(assigned_dynamic_all),
564	/* Everything fails this since it effectively performs a memcpy(). */
565	KUNIT_test_structs(assigned_copy),
566	KUNIT_test_unions(assigned_copy),
567	/* STRUCTLEAK_BYREF_ALL should cover everything from here down. */
568	KUNIT_test_scalars(none),
569	KUNIT_CASE(test_switch_1_none),
570	KUNIT_CASE(test_switch_2_none),
571	/* STRUCTLEAK_BYREF should cover from here down. */
572	KUNIT_test_structs(none),
573	/* STRUCTLEAK will only cover this. */
574	KUNIT_CASE(test_user),
575	{}
576};
577
578static struct kunit_suite stackinit_test_suite = {
579	.name = "stackinit",
580	.test_cases = stackinit_test_cases,
581};
582
583kunit_test_suites(&stackinit_test_suite);
584
585MODULE_DESCRIPTION("Test cases for compiler-based stack variable zeroing");
586MODULE_LICENSE("GPL");