fs: block_dev.c: fix kernel-doc warnings from struct block_device changes

[linux-2.6-microblaze.git] / lib / test_ubsan.c

diff --git a/lib/test_ubsan.c b/lib/test_ubsan.c
index 9ea10ad..5e5d935 100644 (file)
--- a/lib/test_ubsan.c
+++ b/lib/test_ubsan.c
@@ -5,32 +5,54 @@
 
 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_add_overflow(void)
 {
        volatile int val = INT_MAX;
+       volatile unsigned int uval = UINT_MAX;
 
+       UBSAN_TEST(CONFIG_UBSAN_SIGNED_OVERFLOW);
        val += 2;
+
+       UBSAN_TEST(CONFIG_UBSAN_UNSIGNED_OVERFLOW);
+       uval += 2;
 }
 
 static void test_ubsan_sub_overflow(void)
 {
        volatile int val = INT_MIN;
+       volatile unsigned int uval = 0;
        volatile int val2 = 2;
 
+       UBSAN_TEST(CONFIG_UBSAN_SIGNED_OVERFLOW);
        val -= val2;
+
+       UBSAN_TEST(CONFIG_UBSAN_UNSIGNED_OVERFLOW);
+       uval -= val2;
 }
 
 static void test_ubsan_mul_overflow(void)
 {
        volatile int val = INT_MAX / 2;
+       volatile unsigned int uval = UINT_MAX / 2;
 
+       UBSAN_TEST(CONFIG_UBSAN_SIGNED_OVERFLOW);
        val *= 3;
+
+       UBSAN_TEST(CONFIG_UBSAN_UNSIGNED_OVERFLOW);
+       uval *= 3;
 }
 
 static void test_ubsan_negate_overflow(void)
 {
        volatile int val = INT_MIN;
 
+       UBSAN_TEST(CONFIG_UBSAN_SIGNED_OVERFLOW);
        val = -val;
 }
 
@@ -39,37 +61,67 @@ 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;
+
+       UBSAN_TEST(CONFIG_UBSAN_ENUM, "enum");
+       dst = (char *)&eval;
+       src = &c;
+       *dst = *src;
+
+       eptr = &eval2;
+       eval2 = eval;
 }
 
 static void test_ubsan_null_ptr_deref(void)
@@ -77,6 +129,7 @@ static void test_ubsan_null_ptr_deref(void)
        volatile int *ptr = NULL;
        int val;
 
+       UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
        val = *ptr;
 }
 
@@ -85,6 +138,7 @@ 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;
 }
@@ -95,6 +149,7 @@ static void test_ubsan_object_size_mismatch(void)
        volatile int val __aligned(8) = 4;
        volatile long long *ptr, val2;
 
+       UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
        ptr = (long long *)&val;
        val2 = *ptr;
 }
@@ -104,15 +159,19 @@ static const test_ubsan_fp test_ubsan_array[] = {
        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,
+       test_ubsan_null_ptr_deref,
+};
+
 static int __init test_ubsan_init(void)
 {
        unsigned int i;
@@ -120,7 +179,6 @@ 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);