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
test_ubsan_add_overflow(void)8 static void test_ubsan_add_overflow(void)
9 {
10 volatile int val = INT_MAX;
11
12 val += 2;
13 }
14
test_ubsan_sub_overflow(void)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
test_ubsan_mul_overflow(void)23 static void test_ubsan_mul_overflow(void)
24 {
25 volatile int val = INT_MAX / 2;
26
27 val *= 3;
28 }
29
test_ubsan_negate_overflow(void)30 static void test_ubsan_negate_overflow(void)
31 {
32 volatile int val = INT_MIN;
33
34 val = -val;
35 }
36
test_ubsan_divrem_overflow(void)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
test_ubsan_vla_bound_not_positive(void)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
test_ubsan_shift_out_of_bounds(void)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
test_ubsan_out_of_bounds(void)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
test_ubsan_load_invalid_value(void)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
test_ubsan_null_ptr_deref(void)83 static void test_ubsan_null_ptr_deref(void)
84 {
85 volatile int *ptr = NULL;
86 int val;
87
88 val = *ptr;
89 }
90
test_ubsan_misaligned_access(void)91 static void test_ubsan_misaligned_access(void)
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
test_ubsan_object_size_mismatch(void)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
test_ubsan_init(void)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
test_ubsan_exit(void)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 <jinb.park7@gmail.com>");
144 MODULE_LICENSE("GPL v2");
145
