1// SPDX-License-Identifier: GPL-2.0
2#include <linux/init.h>
3#include <linux/kernel.h>
4#include <linux/module.h>
5
6typedef void(*test_ubsan_fp)(void);
7
8static void test_ubsan_add_overflow(void)
9{
10 volatile int val = INT_MAX;
11
12 val += 2;
13}
14
15static void test_ubsan_sub_overflow(void)
16{
17 volatile int val = INT_MIN;
18 volatile int val2 = 2;
19
20 val -= val2;
21}
22
23static void test_ubsan_mul_overflow(void)
24{
25 volatile int val = INT_MAX / 2;
26
27 val *= 3;
28}
29
30static void test_ubsan_negate_overflow(void)
31{
32 volatile int val = INT_MIN;
33
34 val = -val;
35}
36
37static void test_ubsan_divrem_overflow(void)
38{
39 volatile int val = 16;
40 volatile int val2 = 0;
41
42 val /= val2;
43}
44
45static void test_ubsan_shift_out_of_bounds(void)
46{
47 volatile int val = -1;
48 int val2 = 10;
49
50 val2 <<= val;
51}
52
53static void test_ubsan_out_of_bounds(void)
54{
55 volatile int i = 4, j = 5;
56 volatile int arr[4];
57
58 arr[j] = i;
59}
60
61static void test_ubsan_load_invalid_value(void)
62{
63 volatile char *dst, *src;
64 bool val, val2, *ptr;
65 char c = 4;
66
67 dst = (char *)&val;
68 src = &c;
69 *dst = *src;
70
71 ptr = &val2;
72 val2 = val;
73}
74
75static void test_ubsan_null_ptr_deref(void)
76{
77 volatile int *ptr = NULL;
78 int val;
79
80 val = *ptr;
81}
82
83static void test_ubsan_misaligned_access(void)
84{
85 volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
86 volatile int *ptr, val = 6;
87
88 ptr = (int *)(arr + 1);
89 *ptr = val;
90}
91
92static void test_ubsan_object_size_mismatch(void)
93{
94 /* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
95 volatile int val __aligned(8) = 4;
96 volatile long long *ptr, val2;
97
98 ptr = (long long *)&val;
99 val2 = *ptr;
100}
101
102static const test_ubsan_fp test_ubsan_array[] = {
103 test_ubsan_add_overflow,
104 test_ubsan_sub_overflow,
105 test_ubsan_mul_overflow,
106 test_ubsan_negate_overflow,
107 test_ubsan_divrem_overflow,
108 test_ubsan_shift_out_of_bounds,
109 test_ubsan_out_of_bounds,
110 test_ubsan_load_invalid_value,
111 //test_ubsan_null_ptr_deref, /* exclude it because there is a crash */
112 test_ubsan_misaligned_access,
113 test_ubsan_object_size_mismatch,
114};
115
116static int __init test_ubsan_init(void)
117{
118 unsigned int i;
119
120 for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
121 test_ubsan_array[i]();
122
123 (void)test_ubsan_null_ptr_deref; /* to avoid unsed-function warning */
124 return 0;
125}
126module_init(test_ubsan_init);
127
128static void __exit test_ubsan_exit(void)
129{
130 /* do nothing */
131}
132module_exit(test_ubsan_exit);
133
134MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
135MODULE_LICENSE("GPL v2");
136