161 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <linux/init.h>3#include <linux/kernel.h>4#include <linux/module.h>5 6typedef void(*test_ubsan_fp)(void);7 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"); \12 } while (0)13 14static 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 22static 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 31static 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 39static 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 47static void test_ubsan_divrem_overflow(void)48{49 volatile int val = 16;50 volatile int val2 = 0;51 52 UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO);53 val /= val2;54}55 56static void test_ubsan_shift_out_of_bounds(void)57{58 volatile int neg = -1, wrap = 4;59 volatile int val1 = 10;60 volatile int val2 = INT_MAX;61 62 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent");63 val1 <<= neg;64 65 UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow");66 val2 <<= wrap;67}68 69static void test_ubsan_out_of_bounds(void)70{71 volatile int i = 4, j = 5, k = -1;72 volatile char above[4] = { }; /* Protect surrounding memory. */73 volatile int arr[4];74 volatile char below[4] = { }; /* Protect surrounding memory. */75 76 above[0] = below[0];77 78 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above");79 arr[j] = i;80 81 UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below");82 arr[k] = i;83}84 85enum ubsan_test_enum {86 UBSAN_TEST_ZERO = 0,87 UBSAN_TEST_ONE,88 UBSAN_TEST_MAX,89};90 91static void test_ubsan_load_invalid_value(void)92{93 volatile char *dst, *src;94 bool val, val2, *ptr;95 enum ubsan_test_enum eval, eval2, *eptr;96 unsigned char c = 0xff;97 98 UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool");99 dst = (char *)&val;100 src = &c;101 *dst = *src;102 103 ptr = &val2;104 val2 = val;105 106 UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");107 dst = (char *)&eval;108 src = &c;109 *dst = *src;110 111 eptr = &eval2;112 eval2 = eval;113}114 115static void test_ubsan_misaligned_access(void)116{117 volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};118 volatile int *ptr, val = 6;119 120 UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT);121 ptr = (int *)(arr + 1);122 *ptr = val;123}124 125static 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,131 test_ubsan_out_of_bounds,132 test_ubsan_load_invalid_value,133 test_ubsan_misaligned_access,134};135 136/* Excluded because they Oops the module. */137static __used const test_ubsan_fp skip_ubsan_array[] = {138 test_ubsan_divrem_overflow,139};140 141static int __init test_ubsan_init(void)142{143 unsigned int i;144 145 for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)146 test_ubsan_array[i]();147 148 return 0;149}150module_init(test_ubsan_init);151 152static void __exit test_ubsan_exit(void)153{154 /* do nothing */155}156module_exit(test_ubsan_exit);157 158MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");159MODULE_DESCRIPTION("UBSAN unit test");160MODULE_LICENSE("GPL v2");161