[linux.git] / lib / test_ubsan.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>

typedef void(*test_ubsan_fp)(void);

static void test_ubsan_add_overflow(void)
{
	volatile int val = INT_MAX;

	val += 2;
}

static void test_ubsan_sub_overflow(void)
{
	volatile int val = INT_MIN;
	volatile int val2 = 2;

	val -= val2;
}

static void test_ubsan_mul_overflow(void)
{
	volatile int val = INT_MAX / 2;

	val *= 3;
}

static void test_ubsan_negate_overflow(void)
{
	volatile int val = INT_MIN;

	val = -val;
}

static void test_ubsan_divrem_overflow(void)
{
	volatile int val = 16;
	volatile int val2 = 0;

	val /= val2;
}

static void test_ubsan_vla_bound_not_positive(void)
{
	volatile int size = -1;
	char buf[size];

	(void)buf;
}

static void test_ubsan_shift_out_of_bounds(void)
{
	volatile int val = -1;
	int val2 = 10;

	val2 <<= val;
}

static void test_ubsan_out_of_bounds(void)
{
	volatile int i = 4, j = 5;
	volatile int arr[i];

	arr[j] = i;
}

static void test_ubsan_load_invalid_value(void)
{
	volatile char *dst, *src;
	bool val, val2, *ptr;
	char c = 4;

	dst = (char *)&val;
	src = &c;
	*dst = *src;

	ptr = &val2;
	val2 = val;
}

static void test_ubsan_null_ptr_deref(void)
{
	volatile int *ptr = NULL;
	int val;

	val = *ptr;
}

static void test_ubsan_misaligned_access(void)
{
	volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
	volatile int *ptr, val = 6;

	ptr = (int *)(arr + 1);
	*ptr = val;
}

static void test_ubsan_object_size_mismatch(void)
{
	/* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
	volatile int val __aligned(8) = 4;
	volatile long long *ptr, val2;

	ptr = (long long *)&val;
	val2 = *ptr;
}

static const test_ubsan_fp test_ubsan_array[] = {
	test_ubsan_add_overflow,
	test_ubsan_sub_overflow,
	test_ubsan_mul_overflow,
	test_ubsan_negate_overflow,
	test_ubsan_divrem_overflow,
	test_ubsan_vla_bound_not_positive,
	test_ubsan_shift_out_of_bounds,
	test_ubsan_out_of_bounds,
	test_ubsan_load_invalid_value,
	//test_ubsan_null_ptr_deref, /* exclude it because there is a crash */
	test_ubsan_misaligned_access,
	test_ubsan_object_size_mismatch,
};

static int __init test_ubsan_init(void)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
		test_ubsan_array[i]();

	(void)test_ubsan_null_ptr_deref; /* to avoid unsed-function warning */
	return 0;
}
module_init(test_ubsan_init);

static void __exit test_ubsan_exit(void)
{
	/* do nothing */
}
module_exit(test_ubsan_exit);

MODULE_AUTHOR("Jinbum Park <[email protected]>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
854686f4 JP	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/init.h>
	3	#include <linux/kernel.h>
	4	#include <linux/module.h>
	5
	6	typedef void(*test_ubsan_fp)(void);
	7
	8	static void test_ubsan_add_overflow(void)
	9	{
	10	volatile int val = INT_MAX;
	11
	12	val += 2;
	13	}
	14
	15	static void test_ubsan_sub_overflow(void)
	16	{
	17	volatile int val = INT_MIN;
	18	volatile int val2 = 2;
	19
	20	val -= val2;
	21	}
	22
	23	static void test_ubsan_mul_overflow(void)
	24	{
	25	volatile int val = INT_MAX / 2;
	26
	27	val *= 3;
	28	}
	29
	30	static void test_ubsan_negate_overflow(void)
	31	{
	32	volatile int val = INT_MIN;
	33
	34	val = -val;
	35	}
	36
	37	static void test_ubsan_divrem_overflow(void)
	38	{
	39	volatile int val = 16;
	40	volatile int val2 = 0;
	41
	42	val /= val2;
	43	}
	44
	45	static void test_ubsan_vla_bound_not_positive(void)
	46	{
	47	volatile int size = -1;
	48	char buf[size];
	49
	50	(void)buf;
	51	}
	52
	53	static void test_ubsan_shift_out_of_bounds(void)
	54	{
	55	volatile int val = -1;
	56	int val2 = 10;
	57
	58	val2 <<= val;
	59	}
	60
	61	static void test_ubsan_out_of_bounds(void)
	62	{
	63	volatile int i = 4, j = 5;
	64	volatile int arr[i];
65
66	arr[j] = i;
67	}
68
69	static void test_ubsan_load_invalid_value(void)
70	{
71	volatile char dst, src;
72	bool val, val2, *ptr;
73	char c = 4;
74
75	dst = (char *)&val;
76	src = &c;
77	dst = src;
78
79	ptr = &val2;
80	val2 = val;
81	}
82
83	static void test_ubsan_null_ptr_deref(void)
84	{
85	volatile int *ptr = NULL;
86	int val;
87
88	val = *ptr;
89	}
90
31750600	91	static void test_ubsan_misaligned_access(void)
854686f4 JP	92	{
	93	volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
	94	volatile int *ptr, val = 6;
	95
	96	ptr = (int *)(arr + 1);
	97	*ptr = val;
	98	}
	99
	100	static void test_ubsan_object_size_mismatch(void)
	101	{
	102	/* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
	103	volatile int val __aligned(8) = 4;
	104	volatile long long *ptr, val2;
	105
	106	ptr = (long long *)&val;
	107	val2 = *ptr;
	108	}
	109
	110	static const test_ubsan_fp test_ubsan_array[] = {
	111	test_ubsan_add_overflow,
	112	test_ubsan_sub_overflow,
	113	test_ubsan_mul_overflow,
	114	test_ubsan_negate_overflow,
	115	test_ubsan_divrem_overflow,
	116	test_ubsan_vla_bound_not_positive,
	117	test_ubsan_shift_out_of_bounds,
	118	test_ubsan_out_of_bounds,
	119	test_ubsan_load_invalid_value,
	120	//test_ubsan_null_ptr_deref, /* exclude it because there is a crash */
	121	test_ubsan_misaligned_access,
	122	test_ubsan_object_size_mismatch,
	123	};
	124
	125	static int __init test_ubsan_init(void)
	126	{
	127	unsigned int i;
	128
	129	for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
	130	test_ubsan_array[i]();
	131
	132	(void)test_ubsan_null_ptr_deref; /* to avoid unsed-function warning */
	133	return 0;
	134	}
	135	module_init(test_ubsan_init);
	136
	137	static void __exit test_ubsan_exit(void)
	138	{
	139	/* do nothing */
	140	}
	141	module_exit(test_ubsan_exit);
	142
	143	MODULE_AUTHOR("Jinbum Park <[email protected]>");
	144	MODULE_LICENSE("GPL v2");