1 files changed, 44 insertions, 57 deletions

diff --git a/lib/test_ubsan.c b/lib/test_ubsan.c
index 9ea10adf7a66..2062be1f2e80 100644
--- a/lib/test_ubsan.c
+++ b/lib/test_ubsan.c
@@ -5,79 +5,78 @@
 
 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;
-}
+#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 val = -1;
-	int val2 = 10;
+	volatile int neg = -1, wrap = 4;
+	int val1 = 10;
+	int val2 = INT_MAX;
+
+	UBSAN_TEST(CONFIG_UBSAN_SHIFT, "negative exponent");
+	val1 <<= neg;
 
-	val2 <<= val;
+	UBSAN_TEST(CONFIG_UBSAN_SHIFT, "left overflow");
+	val2 <<= wrap;
 }
 
 static void test_ubsan_out_of_bounds(void)
 {
-	volatile int i = 4, j = 5;
+	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;
-	char c = 4;
+	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;
-}
 
-static void test_ubsan_null_ptr_deref(void)
-{
-	volatile int *ptr = NULL;
-	int val;
+	UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");
+	dst = (char *)&eval;
+	src = &c;
+	*dst = *src;
 
-	val = *ptr;
+	eptr = &eval2;
+	eval2 = eval;
 }
 
 static void test_ubsan_misaligned_access(void)
@@ -85,32 +84,21 @@ 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 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,
+};
+
+/* 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)
@@ -120,7 +108,6 @@ static int __init test_ubsan_init(void)
 	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);