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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
8#define UBSAN_TEST(config, ...) do { \
9 pr_info("%s " __VA_ARGS__ "%s(%s=%s)\n", __func__, \
10 sizeof(" " __VA_ARGS__) > 2 ? " " : "", \
11 #config, IS_ENABLED(config) ? "y" : "n"); \
12 } while (0)
13
14static void test_ubsan_divrem_overflow(void)
15{
16 volatile int val = 16;
17 volatile int val2 = 0;
18
19 UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO);
20 val /= val2;
21}
22
23static void test_ubsan_shift_out_of_bounds(void)
24{
25 volatile int neg = -1, wrap = 4;
26 int val1 = 10;
27 int val2 = INT_MAX;
28
29 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent");
30 val1 <<= neg;
31
32 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow");
33 val2 <<= wrap;
34}
35
36static void test_ubsan_out_of_bounds(void)
37{
38 volatile int i = 4, j = 5, k = -1;
39 volatile char above[4] = { }; /* Protect surrounding memory. */
40 volatile int arr[4];
41 volatile char below[4] = { }; /* Protect surrounding memory. */
42
43 above[0] = below[0];
44
45 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above");
46 arr[j] = i;
47
48 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below");
49 arr[k] = i;
50}
51
52enum ubsan_test_enum {
53 UBSAN_TEST_ZERO = 0,
54 UBSAN_TEST_ONE,
55 UBSAN_TEST_MAX,
56};
57
58static void test_ubsan_load_invalid_value(void)
59{
60 volatile char *dst, *src;
61 bool val, val2, *ptr;
62 enum ubsan_test_enum eval, eval2, *eptr;
63 unsigned char c = 0xff;
64
65 UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool");
66 dst = (char *)&val;
67 src = &c;
68 *dst = *src;
69
70 ptr = &val2;
71 val2 = val;
72
73 UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");
74 dst = (char *)&eval;
75 src = &c;
76 *dst = *src;
77
78 eptr = &eval2;
79 eval2 = eval;
80}
81
82static void test_ubsan_null_ptr_deref(void)
83{
84 volatile int *ptr = NULL;
85 int val;
86
87 UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
88 val = *ptr;
89}
90
91static 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 UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT);
97 ptr = (int *)(arr + 1);
98 *ptr = val;
99}
100
101static void test_ubsan_object_size_mismatch(void)
102{
103 /* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
104 volatile int val __aligned(8) = 4;
105 volatile long long *ptr, val2;
106
107 UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
108 ptr = (long long *)&val;
109 val2 = *ptr;
110}
111
112static const test_ubsan_fp test_ubsan_array[] = {
113 test_ubsan_shift_out_of_bounds,
114 test_ubsan_out_of_bounds,
115 test_ubsan_load_invalid_value,
116 test_ubsan_misaligned_access,
117 test_ubsan_object_size_mismatch,
118};
119
120/* Excluded because they Oops the module. */
121static const test_ubsan_fp skip_ubsan_array[] = {
122 test_ubsan_divrem_overflow,
123 test_ubsan_null_ptr_deref,
124};
125
126static int __init test_ubsan_init(void)
127{
128 unsigned int i;
129
130 for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
131 test_ubsan_array[i]();
132
133 return 0;
134}
135module_init(test_ubsan_init);
136
137static void __exit test_ubsan_exit(void)
138{
139 /* do nothing */
140}
141module_exit(test_ubsan_exit);
142
143MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
144MODULE_LICENSE("GPL v2");
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");