1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
3 #include <linux/kernel.h>
4 #include <linux/module.h>
6 typedef void(*test_ubsan_fp
)(void);
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"); \
14 static void test_ubsan_divrem_overflow(void)
16 volatile int val
= 16;
17 volatile int val2
= 0;
19 UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO
);
23 static void test_ubsan_shift_out_of_bounds(void)
25 volatile int neg
= -1, wrap
= 4;
29 UBSAN_TEST(CONFIG_UBSAN_SHIFT
, "negative exponent");
32 UBSAN_TEST(CONFIG_UBSAN_SHIFT
, "left overflow");
36 static void test_ubsan_out_of_bounds(void)
38 volatile int i
= 4, j
= 5, k
= -1;
39 volatile char above
[4] = { }; /* Protect surrounding memory. */
41 volatile char below
[4] = { }; /* Protect surrounding memory. */
45 UBSAN_TEST(CONFIG_UBSAN_BOUNDS
, "above");
48 UBSAN_TEST(CONFIG_UBSAN_BOUNDS
, "below");
52 enum ubsan_test_enum
{
58 static void test_ubsan_load_invalid_value(void)
60 volatile char *dst
, *src
;
62 enum ubsan_test_enum eval
, eval2
, *eptr
;
63 unsigned char c
= 0xff;
65 UBSAN_TEST(CONFIG_UBSAN_BOOL
, "bool");
73 UBSAN_TEST(CONFIG_UBSAN_ENUM
, "enum");
82 static void test_ubsan_null_ptr_deref(void)
84 volatile int *ptr
= NULL
;
87 UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE
);
91 static void test_ubsan_misaligned_access(void)
93 volatile char arr
[5] __aligned(4) = {1, 2, 3, 4, 5};
94 volatile int *ptr
, val
= 6;
96 UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT
);
97 ptr
= (int *)(arr
+ 1);
101 static void test_ubsan_object_size_mismatch(void)
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
;
107 UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE
);
108 ptr
= (long long *)&val
;
112 static 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
,
120 /* Excluded because they Oops the module. */
121 static const test_ubsan_fp skip_ubsan_array
[] = {
122 test_ubsan_divrem_overflow
,
123 test_ubsan_null_ptr_deref
,
126 static int __init
test_ubsan_init(void)
130 for (i
= 0; i
< ARRAY_SIZE(test_ubsan_array
); i
++)
131 test_ubsan_array
[i
]();
135 module_init(test_ubsan_init
);
137 static void __exit
test_ubsan_exit(void)
141 module_exit(test_ubsan_exit
);
143 MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
144 MODULE_LICENSE("GPL v2");