^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) typedef void(*test_ubsan_fp)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define UBSAN_TEST(config, ...) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) pr_info("%s " __VA_ARGS__ "%s(%s=%s)\n", __func__, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) sizeof(" " __VA_ARGS__) > 2 ? " " : "", \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #config, IS_ENABLED(config) ? "y" : "n"); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static void test_ubsan_divrem_overflow(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) volatile int val = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) volatile int val2 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) val /= val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static void test_ubsan_shift_out_of_bounds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) volatile int neg = -1, wrap = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int val1 = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int val2 = INT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) val1 <<= neg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) val2 <<= wrap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void test_ubsan_out_of_bounds(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) volatile int i = 4, j = 5, k = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) volatile char above[4] = { }; /* Protect surrounding memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) volatile int arr[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) volatile char below[4] = { }; /* Protect surrounding memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) above[0] = below[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) arr[j] = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) arr[k] = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) enum ubsan_test_enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) UBSAN_TEST_ZERO = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) UBSAN_TEST_ONE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) UBSAN_TEST_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static void test_ubsan_load_invalid_value(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) volatile char *dst, *src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) bool val, val2, *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) enum ubsan_test_enum eval, eval2, *eptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) unsigned char c = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) dst = (char *)&val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) src = &c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *dst = *src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ptr = &val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) val2 = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) dst = (char *)&eval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) src = &c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) *dst = *src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) eptr = &eval2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) eval2 = eval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static void test_ubsan_null_ptr_deref(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) volatile int *ptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) val = *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static void test_ubsan_misaligned_access(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) volatile int *ptr, val = 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ptr = (int *)(arr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) *ptr = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static void test_ubsan_object_size_mismatch(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) volatile int val __aligned(8) = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) volatile long long *ptr, val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ptr = (long long *)&val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) val2 = *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static const test_ubsan_fp test_ubsan_array[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) test_ubsan_shift_out_of_bounds,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) test_ubsan_out_of_bounds,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) test_ubsan_load_invalid_value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) test_ubsan_misaligned_access,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) test_ubsan_object_size_mismatch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* Excluded because they Oops the module. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static const test_ubsan_fp skip_ubsan_array[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) test_ubsan_divrem_overflow,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) test_ubsan_null_ptr_deref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int __init test_ubsan_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) test_ubsan_array[i]();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) module_init(test_ubsan_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static void __exit test_ubsan_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /* do nothing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) module_exit(test_ubsan_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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