1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h> 2 #include <linux/init.h>
3 #include <linux/kernel.h> 3 #include <linux/kernel.h>
4 #include <linux/module.h> 4 #include <linux/module.h>
5 5
6 typedef void(*test_ubsan_fp)(void); 6 typedef void(*test_ubsan_fp)(void);
7 7
8 #define UBSAN_TEST(config, ...) do { 8 #define UBSAN_TEST(config, ...) do { \
9 pr_info("%s " __VA_ARGS__ "%s( 9 pr_info("%s " __VA_ARGS__ "%s(%s=%s)\n", __func__, \
10 sizeof(" " __VA_ARGS__ 10 sizeof(" " __VA_ARGS__) > 2 ? " " : "", \
11 #config, IS_ENABLED(co 11 #config, IS_ENABLED(config) ? "y" : "n"); \
12 } while (0) 12 } while (0)
13 13
14 static void test_ubsan_add_overflow(void) 14 static void test_ubsan_add_overflow(void)
15 { 15 {
16 volatile int val = INT_MAX; 16 volatile int val = INT_MAX;
17 17
18 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP); 18 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP);
19 val += 2; 19 val += 2;
20 } 20 }
21 21
22 static void test_ubsan_sub_overflow(void) 22 static void test_ubsan_sub_overflow(void)
23 { 23 {
24 volatile int val = INT_MIN; 24 volatile int val = INT_MIN;
25 volatile int val2 = 2; 25 volatile int val2 = 2;
26 26
27 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP); 27 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP);
28 val -= val2; 28 val -= val2;
29 } 29 }
30 30
31 static void test_ubsan_mul_overflow(void) 31 static void test_ubsan_mul_overflow(void)
32 { 32 {
33 volatile int val = INT_MAX / 2; 33 volatile int val = INT_MAX / 2;
34 34
35 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP); 35 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP);
36 val *= 3; 36 val *= 3;
37 } 37 }
38 38
39 static void test_ubsan_negate_overflow(void) 39 static void test_ubsan_negate_overflow(void)
40 { 40 {
41 volatile int val = INT_MIN; 41 volatile int val = INT_MIN;
42 42
43 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP); 43 UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP);
44 val = -val; 44 val = -val;
45 } 45 }
46 46
47 static void test_ubsan_divrem_overflow(void) 47 static void test_ubsan_divrem_overflow(void)
48 { 48 {
49 volatile int val = 16; 49 volatile int val = 16;
50 volatile int val2 = 0; 50 volatile int val2 = 0;
51 51
52 UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO); 52 UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO);
53 val /= val2; 53 val /= val2;
54 } 54 }
55 55
56 static void test_ubsan_shift_out_of_bounds(voi 56 static void test_ubsan_shift_out_of_bounds(void)
57 { 57 {
58 volatile int neg = -1, wrap = 4; 58 volatile int neg = -1, wrap = 4;
59 volatile int val1 = 10; 59 volatile int val1 = 10;
60 volatile int val2 = INT_MAX; 60 volatile int val2 = INT_MAX;
61 61
62 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negati 62 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent");
63 val1 <<= neg; 63 val1 <<= neg;
64 64
65 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left o 65 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow");
66 val2 <<= wrap; 66 val2 <<= wrap;
67 } 67 }
68 68
69 static void test_ubsan_out_of_bounds(void) 69 static void test_ubsan_out_of_bounds(void)
70 { 70 {
71 volatile int i = 4, j = 5, k = -1; 71 volatile int i = 4, j = 5, k = -1;
72 volatile char above[4] = { }; /* Prote 72 volatile char above[4] = { }; /* Protect surrounding memory. */
73 volatile int arr[4]; 73 volatile int arr[4];
74 volatile char below[4] = { }; /* Prote 74 volatile char below[4] = { }; /* Protect surrounding memory. */
75 75
76 above[0] = below[0]; 76 above[0] = below[0];
77 77
78 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above 78 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above");
79 arr[j] = i; 79 arr[j] = i;
80 80
81 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below 81 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below");
82 arr[k] = i; 82 arr[k] = i;
83 } 83 }
84 84
85 enum ubsan_test_enum { 85 enum ubsan_test_enum {
86 UBSAN_TEST_ZERO = 0, 86 UBSAN_TEST_ZERO = 0,
87 UBSAN_TEST_ONE, 87 UBSAN_TEST_ONE,
88 UBSAN_TEST_MAX, 88 UBSAN_TEST_MAX,
89 }; 89 };
90 90
91 static void test_ubsan_load_invalid_value(void 91 static void test_ubsan_load_invalid_value(void)
92 { 92 {
93 volatile char *dst, *src; 93 volatile char *dst, *src;
94 bool val, val2, *ptr; 94 bool val, val2, *ptr;
95 enum ubsan_test_enum eval, eval2, *ept 95 enum ubsan_test_enum eval, eval2, *eptr;
96 unsigned char c = 0xff; 96 unsigned char c = 0xff;
97 97
98 UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool"); 98 UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool");
99 dst = (char *)&val; 99 dst = (char *)&val;
100 src = &c; 100 src = &c;
101 *dst = *src; 101 *dst = *src;
102 102
103 ptr = &val2; 103 ptr = &val2;
104 val2 = val; 104 val2 = val;
105 105
106 UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum"); 106 UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");
107 dst = (char *)&eval; 107 dst = (char *)&eval;
108 src = &c; 108 src = &c;
109 *dst = *src; 109 *dst = *src;
110 110
111 eptr = &eval2; 111 eptr = &eval2;
112 eval2 = eval; 112 eval2 = eval;
113 } 113 }
114 114
115 static void test_ubsan_misaligned_access(void) 115 static void test_ubsan_misaligned_access(void)
116 { 116 {
117 volatile char arr[5] __aligned(4) = {1 117 volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
118 volatile int *ptr, val = 6; 118 volatile int *ptr, val = 6;
119 119
120 UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT); 120 UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT);
121 ptr = (int *)(arr + 1); 121 ptr = (int *)(arr + 1);
122 *ptr = val; 122 *ptr = val;
123 } 123 }
124 124
125 static const test_ubsan_fp test_ubsan_array[] 125 static const test_ubsan_fp test_ubsan_array[] = {
126 test_ubsan_add_overflow, 126 test_ubsan_add_overflow,
127 test_ubsan_sub_overflow, 127 test_ubsan_sub_overflow,
128 test_ubsan_mul_overflow, 128 test_ubsan_mul_overflow,
129 test_ubsan_negate_overflow, 129 test_ubsan_negate_overflow,
130 test_ubsan_shift_out_of_bounds, 130 test_ubsan_shift_out_of_bounds,
131 test_ubsan_out_of_bounds, 131 test_ubsan_out_of_bounds,
132 test_ubsan_load_invalid_value, 132 test_ubsan_load_invalid_value,
133 test_ubsan_misaligned_access, 133 test_ubsan_misaligned_access,
134 }; 134 };
135 135
136 /* Excluded because they Oops the module. */ 136 /* Excluded because they Oops the module. */
137 static __used const test_ubsan_fp skip_ubsan_a 137 static __used const test_ubsan_fp skip_ubsan_array[] = {
138 test_ubsan_divrem_overflow, 138 test_ubsan_divrem_overflow,
139 }; 139 };
140 140
141 static int __init test_ubsan_init(void) 141 static int __init test_ubsan_init(void)
142 { 142 {
143 unsigned int i; 143 unsigned int i;
144 144
145 for (i = 0; i < ARRAY_SIZE(test_ubsan_ 145 for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
146 test_ubsan_array[i](); 146 test_ubsan_array[i]();
147 147
148 return 0; 148 return 0;
149 } 149 }
150 module_init(test_ubsan_init); 150 module_init(test_ubsan_init);
151 151
152 static void __exit test_ubsan_exit(void) 152 static void __exit test_ubsan_exit(void)
153 { 153 {
154 /* do nothing */ 154 /* do nothing */
155 } 155 }
156 module_exit(test_ubsan_exit); 156 module_exit(test_ubsan_exit);
157 157
158 MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.c 158 MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
159 MODULE_DESCRIPTION("UBSAN unit test"); 159 MODULE_DESCRIPTION("UBSAN unit test");
160 MODULE_LICENSE("GPL v2"); 160 MODULE_LICENSE("GPL v2");
161 161
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