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// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
typedef void(*test_ubsan_fp)(void);
static void test_ubsan_add_overflow(void)
{
volatile int val = INT_MAX;
val += 2;
}
static void test_ubsan_sub_overflow(void)
{
volatile int val = INT_MIN;
volatile int val2 = 2;
val -= val2;
}
static void test_ubsan_mul_overflow(void)
{
volatile int val = INT_MAX / 2;
val *= 3;
}
static void test_ubsan_negate_overflow(void)
{
volatile int val = INT_MIN;
val = -val;
}
static void test_ubsan_divrem_overflow(void)
{
volatile int val = 16;
volatile int val2 = 0;
val /= val2;
}
static void test_ubsan_shift_out_of_bounds(void)
{
volatile int val = -1;
int val2 = 10;
val2 <<= val;
}
static void test_ubsan_out_of_bounds(void)
{
volatile int i = 4, j = 5;
volatile int arr[4];
arr[j] = i;
}
static void test_ubsan_load_invalid_value(void)
{
volatile char *dst, *src;
bool val, val2, *ptr;
char c = 4;
dst = (char *)&val;
src = &c;
*dst = *src;
ptr = &val2;
val2 = val;
}
static void test_ubsan_null_ptr_deref(void)
{
volatile int *ptr = NULL;
int val;
val = *ptr;
}
static void test_ubsan_misaligned_access(void)
{
volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
volatile int *ptr, val = 6;
ptr = (int *)(arr + 1);
*ptr = val;
}
static void test_ubsan_object_size_mismatch(void)
{
/* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
volatile int val __aligned(8) = 4;
volatile long long *ptr, val2;
ptr = (long long *)&val;
val2 = *ptr;
}
static const test_ubsan_fp test_ubsan_array[] = {
test_ubsan_add_overflow,
test_ubsan_sub_overflow,
test_ubsan_mul_overflow,
test_ubsan_negate_overflow,
test_ubsan_divrem_overflow,
test_ubsan_shift_out_of_bounds,
test_ubsan_out_of_bounds,
test_ubsan_load_invalid_value,
//test_ubsan_null_ptr_deref, /* exclude it because there is a crash */
test_ubsan_misaligned_access,
test_ubsan_object_size_mismatch,
};
static int __init test_ubsan_init(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
test_ubsan_array[i]();
(void)test_ubsan_null_ptr_deref; /* to avoid unsed-function warning */
return 0;
}
module_init(test_ubsan_init);
static void __exit test_ubsan_exit(void)
{
/* do nothing */
}
module_exit(test_ubsan_exit);
MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
MODULE_LICENSE("GPL v2");
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