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