1 files changed, 122 insertions, 0 deletions
diff --git a/lib/test_ubsan.c b/lib/test_ubsan.c
new file mode 100644
index 000000000..2062be1f2
--- /dev/null
+++ b/lib/test_ubsan.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+typedef void(*test_ubsan_fp)(void);
+
+#define UBSAN_TEST(config, ...)	do {					\
+		pr_info("%s " __VA_ARGS__ "%s(%s=%s)\n", __func__,	\
+			sizeof(" " __VA_ARGS__) > 2 ? " " : "",		\
+			#config, IS_ENABLED(config) ? "y" : "n");	\
+	} while (0)
+
+static void test_ubsan_divrem_overflow(void)
+{
+	volatile int val = 16;
+	volatile int val2 = 0;
+
+	UBSAN_TEST(CONFIG_UBSAN_DIV_ZERO);
+	val /= val2;
+}
+
+static void test_ubsan_shift_out_of_bounds(void)
+{
+	volatile int neg = -1, wrap = 4;
+	int val1 = 10;
+	int val2 = INT_MAX;
+
+	UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent");
+	val1 <<= neg;
+
+	UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow");
+	val2 <<= wrap;
+}
+
+static void test_ubsan_out_of_bounds(void)
+{
+	volatile int i = 4, j = 5, k = -1;
+	volatile char above[4] = { }; /* Protect surrounding memory. */
+	volatile int arr[4];
+	volatile char below[4] = { }; /* Protect surrounding memory. */
+
+	above[0] = below[0];
+
+	UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "above");
+	arr[j] = i;
+
+	UBSAN_TEST(CONFIG_UBSAN_BOUNDS, "below");
+	arr[k] = i;
+}
+
+enum ubsan_test_enum {
+	UBSAN_TEST_ZERO = 0,
+	UBSAN_TEST_ONE,
+	UBSAN_TEST_MAX,
+};
+
+static void test_ubsan_load_invalid_value(void)
+{
+	volatile char *dst, *src;
+	bool val, val2, *ptr;
+	enum ubsan_test_enum eval, eval2, *eptr;
+	unsigned char c = 0xff;
+
+	UBSAN_TEST(CONFIG_UBSAN_BOOL, "bool");
+	dst = (char *)&val;
+	src = &c;
+	*dst = *src;
+
+	ptr = &val2;
+	val2 = val;
+
+	UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");
+	dst = (char *)&eval;
+	src = &c;
+	*dst = *src;
+
+	eptr = &eval2;
+	eval2 = eval;
+}
+
+static void test_ubsan_misaligned_access(void)
+{
+	volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
+	volatile int *ptr, val = 6;
+
+	UBSAN_TEST(CONFIG_UBSAN_ALIGNMENT);
+	ptr = (int *)(arr + 1);
+	*ptr = val;
+}
+
+static const test_ubsan_fp test_ubsan_array[] = {
+	test_ubsan_shift_out_of_bounds,
+	test_ubsan_out_of_bounds,
+	test_ubsan_load_invalid_value,
+	test_ubsan_misaligned_access,
+};
+
+/* Excluded because they Oops the module. */
+static const test_ubsan_fp skip_ubsan_array[] = {
+	test_ubsan_divrem_overflow,
+};
+
+static int __init test_ubsan_init(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
+		test_ubsan_array[i]();
+
+	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");