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authorKees Cook <keescook@chromium.org>2022-10-24 23:11:25 +0300
committerKees Cook <keescook@chromium.org>2022-11-02 22:39:27 +0300
commit4b21d25bf519c9487935a664886956bb18f04f6d (patch)
treeea067b7ddbc65e7285aa22389cb020c9fcb0fb54 /lib/overflow_kunit.c
parent6dd142d9013ca82155d0c069434c60a0d5755ec0 (diff)
downloadlinux-4b21d25bf519c9487935a664886956bb18f04f6d.tar.xz
overflow: Introduce overflows_type() and castable_to_type()
Implement a robust overflows_type() macro to test if a variable or constant value would overflow another variable or type. This can be used as a constant expression for static_assert() (which requires a constant expression[1][2]) when used on constant values. This must be constructed manually, since __builtin_add_overflow() does not produce a constant expression[3]. Additionally adds castable_to_type(), similar to __same_type(), but for checking if a constant value would overflow if cast to a given type. Add unit tests for overflows_type(), __same_type(), and castable_to_type() to the existing KUnit "overflow" test: [16:03:33] ================== overflow (21 subtests) ================== ... [16:03:33] [PASSED] overflows_type_test [16:03:33] [PASSED] same_type_test [16:03:33] [PASSED] castable_to_type_test [16:03:33] ==================== [PASSED] overflow ===================== [16:03:33] ============================================================ [16:03:33] Testing complete. Ran 21 tests: passed: 21 [16:03:33] Elapsed time: 24.022s total, 0.002s configuring, 22.598s building, 0.767s running [1] https://en.cppreference.com/w/c/language/_Static_assert [2] C11 standard (ISO/IEC 9899:2011): 6.7.10 Static assertions [3] https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html 6.56 Built-in Functions to Perform Arithmetic with Overflow Checking Built-in Function: bool __builtin_add_overflow (type1 a, type2 b, Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Tom Rix <trix@redhat.com> Cc: Daniel Latypov <dlatypov@google.com> Cc: Vitor Massaru Iha <vitor@massaru.org> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: linux-hardening@vger.kernel.org Cc: llvm@lists.linux.dev Co-developed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20221024201125.1416422-1-gwan-gyeong.mun@intel.com
Diffstat (limited to 'lib/overflow_kunit.c')
-rw-r--r--lib/overflow_kunit.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/lib/overflow_kunit.c b/lib/overflow_kunit.c
index b8556a2e7bb1..dcd3ba102db6 100644
--- a/lib/overflow_kunit.c
+++ b/lib/overflow_kunit.c
@@ -736,6 +736,384 @@ static void overflow_size_helpers_test(struct kunit *test)
#undef check_one_size_helper
}
+static void overflows_type_test(struct kunit *test)
+{
+ int count = 0;
+ unsigned int var;
+
+#define __TEST_OVERFLOWS_TYPE(func, arg1, arg2, of) do { \
+ bool __of = func(arg1, arg2); \
+ KUNIT_EXPECT_EQ_MSG(test, __of, of, \
+ "expected " #func "(" #arg1 ", " #arg2 " to%s overflow\n",\
+ of ? "" : " not"); \
+ count++; \
+} while (0)
+
+/* Args are: first type, second type, value, overflow expected */
+#define TEST_OVERFLOWS_TYPE(__t1, __t2, v, of) do { \
+ __t1 t1 = (v); \
+ __t2 t2; \
+ __TEST_OVERFLOWS_TYPE(__overflows_type, t1, t2, of); \
+ __TEST_OVERFLOWS_TYPE(__overflows_type, t1, __t2, of); \
+ __TEST_OVERFLOWS_TYPE(__overflows_type_constexpr, t1, t2, of); \
+ __TEST_OVERFLOWS_TYPE(__overflows_type_constexpr, t1, __t2, of);\
+} while (0)
+
+ TEST_OVERFLOWS_TYPE(u8, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u8, u16, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u8, s8, U8_MAX, true);
+ TEST_OVERFLOWS_TYPE(u8, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u8, s8, (u8)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u8, s16, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, u8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, u8, -1, true);
+ TEST_OVERFLOWS_TYPE(s8, u8, S8_MIN, true);
+ TEST_OVERFLOWS_TYPE(s8, u16, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, u16, -1, true);
+ TEST_OVERFLOWS_TYPE(s8, u16, S8_MIN, true);
+ TEST_OVERFLOWS_TYPE(s8, u32, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, u32, -1, true);
+ TEST_OVERFLOWS_TYPE(s8, u32, S8_MIN, true);
+#if BITS_PER_LONG == 64
+ TEST_OVERFLOWS_TYPE(s8, u64, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, u64, -1, true);
+ TEST_OVERFLOWS_TYPE(s8, u64, S8_MIN, true);
+#endif
+ TEST_OVERFLOWS_TYPE(s8, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, s8, S8_MIN, false);
+ TEST_OVERFLOWS_TYPE(s8, s16, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s8, s16, S8_MIN, false);
+ TEST_OVERFLOWS_TYPE(u16, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u16, u8, (u16)U8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u16, u8, U16_MAX, true);
+ TEST_OVERFLOWS_TYPE(u16, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u16, s8, (u16)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u16, s8, U16_MAX, true);
+ TEST_OVERFLOWS_TYPE(u16, s16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(u16, s16, (u16)S16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u16, s16, U16_MAX, true);
+ TEST_OVERFLOWS_TYPE(u16, u32, U16_MAX, false);
+ TEST_OVERFLOWS_TYPE(u16, s32, U16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, u8, (s16)U8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s16, u8, -1, true);
+ TEST_OVERFLOWS_TYPE(s16, u8, S16_MIN, true);
+ TEST_OVERFLOWS_TYPE(s16, u16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, u16, -1, true);
+ TEST_OVERFLOWS_TYPE(s16, u16, S16_MIN, true);
+ TEST_OVERFLOWS_TYPE(s16, u32, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, u32, -1, true);
+ TEST_OVERFLOWS_TYPE(s16, u32, S16_MIN, true);
+#if BITS_PER_LONG == 64
+ TEST_OVERFLOWS_TYPE(s16, u64, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, u64, -1, true);
+ TEST_OVERFLOWS_TYPE(s16, u64, S16_MIN, true);
+#endif
+ TEST_OVERFLOWS_TYPE(s16, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, s8, S8_MIN, false);
+ TEST_OVERFLOWS_TYPE(s16, s8, (s16)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s16, s8, (s16)S8_MIN - 1, true);
+ TEST_OVERFLOWS_TYPE(s16, s8, S16_MAX, true);
+ TEST_OVERFLOWS_TYPE(s16, s8, S16_MIN, true);
+ TEST_OVERFLOWS_TYPE(s16, s16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, s16, S16_MIN, false);
+ TEST_OVERFLOWS_TYPE(s16, s32, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s16, s32, S16_MIN, false);
+ TEST_OVERFLOWS_TYPE(u32, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, u8, (u32)U8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u32, u8, U32_MAX, true);
+ TEST_OVERFLOWS_TYPE(u32, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, s8, (u32)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u32, s8, U32_MAX, true);
+ TEST_OVERFLOWS_TYPE(u32, u16, U16_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, u16, U16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u32, u16, U32_MAX, true);
+ TEST_OVERFLOWS_TYPE(u32, s16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, s16, (u32)S16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u32, s16, U32_MAX, true);
+ TEST_OVERFLOWS_TYPE(u32, u32, U32_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, s32, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, s32, U32_MAX, true);
+ TEST_OVERFLOWS_TYPE(u32, s32, (u32)S32_MAX + 1, true);
+#if BITS_PER_LONG == 64
+ TEST_OVERFLOWS_TYPE(u32, u64, U32_MAX, false);
+ TEST_OVERFLOWS_TYPE(u32, s64, U32_MAX, false);
+#endif
+ TEST_OVERFLOWS_TYPE(s32, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, u8, (s32)U8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s32, u16, S32_MAX, true);
+ TEST_OVERFLOWS_TYPE(s32, u8, -1, true);
+ TEST_OVERFLOWS_TYPE(s32, u8, S32_MIN, true);
+ TEST_OVERFLOWS_TYPE(s32, u16, U16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, u16, (s32)U16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s32, u16, S32_MAX, true);
+ TEST_OVERFLOWS_TYPE(s32, u16, -1, true);
+ TEST_OVERFLOWS_TYPE(s32, u16, S32_MIN, true);
+ TEST_OVERFLOWS_TYPE(s32, u32, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, u32, -1, true);
+ TEST_OVERFLOWS_TYPE(s32, u32, S32_MIN, true);
+#if BITS_PER_LONG == 64
+ TEST_OVERFLOWS_TYPE(s32, u64, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, u64, -1, true);
+ TEST_OVERFLOWS_TYPE(s32, u64, S32_MIN, true);
+#endif
+ TEST_OVERFLOWS_TYPE(s32, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, s8, S8_MIN, false);
+ TEST_OVERFLOWS_TYPE(s32, s8, (s32)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s32, s8, (s32)S8_MIN - 1, true);
+ TEST_OVERFLOWS_TYPE(s32, s8, S32_MAX, true);
+ TEST_OVERFLOWS_TYPE(s32, s8, S32_MIN, true);
+ TEST_OVERFLOWS_TYPE(s32, s16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, s16, S16_MIN, false);
+ TEST_OVERFLOWS_TYPE(s32, s16, (s32)S16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s32, s16, (s32)S16_MIN - 1, true);
+ TEST_OVERFLOWS_TYPE(s32, s16, S32_MAX, true);
+ TEST_OVERFLOWS_TYPE(s32, s16, S32_MIN, true);
+ TEST_OVERFLOWS_TYPE(s32, s32, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, s32, S32_MIN, false);
+#if BITS_PER_LONG == 64
+ TEST_OVERFLOWS_TYPE(s32, s64, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(s32, s64, S32_MIN, false);
+ TEST_OVERFLOWS_TYPE(u64, u8, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, u8, (u64)U8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u64, u16, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, u16, U16_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, u16, (u64)U16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u64, u32, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, u32, U32_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, u32, (u64)U32_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u64, u64, U64_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, s8, (u64)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u64, s8, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, s16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, s16, (u64)S16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u64, s16, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, s32, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, s32, (u64)S32_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(u64, s32, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, s64, S64_MAX, false);
+ TEST_OVERFLOWS_TYPE(u64, s64, U64_MAX, true);
+ TEST_OVERFLOWS_TYPE(u64, s64, (u64)S64_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, u8, S64_MAX, true);
+ TEST_OVERFLOWS_TYPE(s64, u8, S64_MIN, true);
+ TEST_OVERFLOWS_TYPE(s64, u8, -1, true);
+ TEST_OVERFLOWS_TYPE(s64, u8, U8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, u8, (s64)U8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, u16, S64_MAX, true);
+ TEST_OVERFLOWS_TYPE(s64, u16, S64_MIN, true);
+ TEST_OVERFLOWS_TYPE(s64, u16, -1, true);
+ TEST_OVERFLOWS_TYPE(s64, u16, U16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, u16, (s64)U16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, u32, S64_MAX, true);
+ TEST_OVERFLOWS_TYPE(s64, u32, S64_MIN, true);
+ TEST_OVERFLOWS_TYPE(s64, u32, -1, true);
+ TEST_OVERFLOWS_TYPE(s64, u32, U32_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, u32, (s64)U32_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, u64, S64_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, u64, S64_MIN, true);
+ TEST_OVERFLOWS_TYPE(s64, u64, -1, true);
+ TEST_OVERFLOWS_TYPE(s64, s8, S8_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, s8, S8_MIN, false);
+ TEST_OVERFLOWS_TYPE(s64, s8, (s64)S8_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, s8, (s64)S8_MIN - 1, true);
+ TEST_OVERFLOWS_TYPE(s64, s8, S64_MAX, true);
+ TEST_OVERFLOWS_TYPE(s64, s16, S16_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, s16, S16_MIN, false);
+ TEST_OVERFLOWS_TYPE(s64, s16, (s64)S16_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, s16, (s64)S16_MIN - 1, true);
+ TEST_OVERFLOWS_TYPE(s64, s16, S64_MAX, true);
+ TEST_OVERFLOWS_TYPE(s64, s32, S32_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, s32, S32_MIN, false);
+ TEST_OVERFLOWS_TYPE(s64, s32, (s64)S32_MAX + 1, true);
+ TEST_OVERFLOWS_TYPE(s64, s32, (s64)S32_MIN - 1, true);
+ TEST_OVERFLOWS_TYPE(s64, s32, S64_MAX, true);
+ TEST_OVERFLOWS_TYPE(s64, s64, S64_MAX, false);
+ TEST_OVERFLOWS_TYPE(s64, s64, S64_MIN, false);
+#endif
+
+ /* Check for macro side-effects. */
+ var = INT_MAX - 1;
+ __TEST_OVERFLOWS_TYPE(__overflows_type, var++, int, false);
+ __TEST_OVERFLOWS_TYPE(__overflows_type, var++, int, false);
+ __TEST_OVERFLOWS_TYPE(__overflows_type, var++, int, true);
+ var = INT_MAX - 1;
+ __TEST_OVERFLOWS_TYPE(overflows_type, var++, int, false);
+ __TEST_OVERFLOWS_TYPE(overflows_type, var++, int, false);
+ __TEST_OVERFLOWS_TYPE(overflows_type, var++, int, true);
+
+ kunit_info(test, "%d overflows_type() tests finished\n", count);
+#undef TEST_OVERFLOWS_TYPE
+#undef __TEST_OVERFLOWS_TYPE
+}
+
+static void same_type_test(struct kunit *test)
+{
+ int count = 0;
+ int var;
+
+#define TEST_SAME_TYPE(t1, t2, same) do { \
+ typeof(t1) __t1h = type_max(t1); \
+ typeof(t1) __t1l = type_min(t1); \
+ typeof(t2) __t2h = type_max(t2); \
+ typeof(t2) __t2l = type_min(t2); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(t1, __t1h)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(t1, __t1l)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(__t1h, t1)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(__t1l, t1)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(t2, __t2h)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(t2, __t2l)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(__t2h, t2)); \
+ KUNIT_EXPECT_EQ(test, true, __same_type(__t2l, t2)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(t1, t2)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(t2, __t1h)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(t2, __t1l)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(__t1h, t2)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(__t1l, t2)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(t1, __t2h)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(t1, __t2l)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(__t2h, t1)); \
+ KUNIT_EXPECT_EQ(test, same, __same_type(__t2l, t1)); \
+} while (0)
+
+#if BITS_PER_LONG == 64
+# define TEST_SAME_TYPE64(base, t, m) TEST_SAME_TYPE(base, t, m)
+#else
+# define TEST_SAME_TYPE64(base, t, m) do { } while (0)
+#endif
+
+#define TEST_TYPE_SETS(base, mu8, mu16, mu32, ms8, ms16, ms32, mu64, ms64) \
+do { \
+ TEST_SAME_TYPE(base, u8, mu8); \
+ TEST_SAME_TYPE(base, u16, mu16); \
+ TEST_SAME_TYPE(base, u32, mu32); \
+ TEST_SAME_TYPE(base, s8, ms8); \
+ TEST_SAME_TYPE(base, s16, ms16); \
+ TEST_SAME_TYPE(base, s32, ms32); \
+ TEST_SAME_TYPE64(base, u64, mu64); \
+ TEST_SAME_TYPE64(base, s64, ms64); \
+} while (0)
+
+ TEST_TYPE_SETS(u8, true, false, false, false, false, false, false, false);
+ TEST_TYPE_SETS(u16, false, true, false, false, false, false, false, false);
+ TEST_TYPE_SETS(u32, false, false, true, false, false, false, false, false);
+ TEST_TYPE_SETS(s8, false, false, false, true, false, false, false, false);
+ TEST_TYPE_SETS(s16, false, false, false, false, true, false, false, false);
+ TEST_TYPE_SETS(s32, false, false, false, false, false, true, false, false);
+#if BITS_PER_LONG == 64
+ TEST_TYPE_SETS(u64, false, false, false, false, false, false, true, false);
+ TEST_TYPE_SETS(s64, false, false, false, false, false, false, false, true);
+#endif
+
+ /* Check for macro side-effects. */
+ var = 4;
+ KUNIT_EXPECT_EQ(test, var, 4);
+ KUNIT_EXPECT_TRUE(test, __same_type(var++, int));
+ KUNIT_EXPECT_EQ(test, var, 4);
+ KUNIT_EXPECT_TRUE(test, __same_type(int, var++));
+ KUNIT_EXPECT_EQ(test, var, 4);
+ KUNIT_EXPECT_TRUE(test, __same_type(var++, var++));
+ KUNIT_EXPECT_EQ(test, var, 4);
+
+ kunit_info(test, "%d __same_type() tests finished\n", count);
+
+#undef TEST_TYPE_SETS
+#undef TEST_SAME_TYPE64
+#undef TEST_SAME_TYPE
+}
+
+static void castable_to_type_test(struct kunit *test)
+{
+ int count = 0;
+
+#define TEST_CASTABLE_TO_TYPE(arg1, arg2, pass) do { \
+ bool __pass = castable_to_type(arg1, arg2); \
+ KUNIT_EXPECT_EQ_MSG(test, __pass, pass, \
+ "expected castable_to_type(" #arg1 ", " #arg2 ") to%s pass\n",\
+ pass ? "" : " not"); \
+ count++; \
+} while (0)
+
+ TEST_CASTABLE_TO_TYPE(16, u8, true);
+ TEST_CASTABLE_TO_TYPE(16, u16, true);
+ TEST_CASTABLE_TO_TYPE(16, u32, true);
+ TEST_CASTABLE_TO_TYPE(16, s8, true);
+ TEST_CASTABLE_TO_TYPE(16, s16, true);
+ TEST_CASTABLE_TO_TYPE(16, s32, true);
+ TEST_CASTABLE_TO_TYPE(-16, s8, true);
+ TEST_CASTABLE_TO_TYPE(-16, s16, true);
+ TEST_CASTABLE_TO_TYPE(-16, s32, true);
+#if BITS_PER_LONG == 64
+ TEST_CASTABLE_TO_TYPE(16, u64, true);
+ TEST_CASTABLE_TO_TYPE(-16, s64, true);
+#endif
+
+#define TEST_CASTABLE_TO_TYPE_VAR(width) do { \
+ u ## width u ## width ## var = 0; \
+ s ## width s ## width ## var = 0; \
+ \
+ /* Constant expressions that fit types. */ \
+ TEST_CASTABLE_TO_TYPE(type_max(u ## width), u ## width, true); \
+ TEST_CASTABLE_TO_TYPE(type_min(u ## width), u ## width, true); \
+ TEST_CASTABLE_TO_TYPE(type_max(u ## width), u ## width ## var, true); \
+ TEST_CASTABLE_TO_TYPE(type_min(u ## width), u ## width ## var, true); \
+ TEST_CASTABLE_TO_TYPE(type_max(s ## width), s ## width, true); \
+ TEST_CASTABLE_TO_TYPE(type_min(s ## width), s ## width, true); \
+ TEST_CASTABLE_TO_TYPE(type_max(s ## width), s ## width ## var, true); \
+ TEST_CASTABLE_TO_TYPE(type_min(u ## width), s ## width ## var, true); \
+ /* Constant expressions that do not fit types. */ \
+ TEST_CASTABLE_TO_TYPE(type_max(u ## width), s ## width, false); \
+ TEST_CASTABLE_TO_TYPE(type_max(u ## width), s ## width ## var, false); \
+ TEST_CASTABLE_TO_TYPE(type_min(s ## width), u ## width, false); \
+ TEST_CASTABLE_TO_TYPE(type_min(s ## width), u ## width ## var, false); \
+ /* Non-constant expression with mismatched type. */ \
+ TEST_CASTABLE_TO_TYPE(s ## width ## var, u ## width, false); \
+ TEST_CASTABLE_TO_TYPE(u ## width ## var, s ## width, false); \
+} while (0)
+
+#define TEST_CASTABLE_TO_TYPE_RANGE(width) do { \
+ unsigned long big = U ## width ## _MAX; \
+ signed long small = S ## width ## _MIN; \
+ u ## width u ## width ## var = 0; \
+ s ## width s ## width ## var = 0; \
+ \
+ /* Constant expression in range. */ \
+ TEST_CASTABLE_TO_TYPE(U ## width ## _MAX, u ## width, true); \
+ TEST_CASTABLE_TO_TYPE(U ## width ## _MAX, u ## width ## var, true); \
+ TEST_CASTABLE_TO_TYPE(S ## width ## _MIN, s ## width, true); \
+ TEST_CASTABLE_TO_TYPE(S ## width ## _MIN, s ## width ## var, true); \
+ /* Constant expression out of range. */ \
+ TEST_CASTABLE_TO_TYPE((unsigned long)U ## width ## _MAX + 1, u ## width, false); \
+ TEST_CASTABLE_TO_TYPE((unsigned long)U ## width ## _MAX + 1, u ## width ## var, false); \
+ TEST_CASTABLE_TO_TYPE((signed long)S ## width ## _MIN - 1, s ## width, false); \
+ TEST_CASTABLE_TO_TYPE((signed long)S ## width ## _MIN - 1, s ## width ## var, false); \
+ /* Non-constant expression with mismatched type. */ \
+ TEST_CASTABLE_TO_TYPE(big, u ## width, false); \
+ TEST_CASTABLE_TO_TYPE(big, u ## width ## var, false); \
+ TEST_CASTABLE_TO_TYPE(small, s ## width, false); \
+ TEST_CASTABLE_TO_TYPE(small, s ## width ## var, false); \
+} while (0)
+
+ TEST_CASTABLE_TO_TYPE_VAR(8);
+ TEST_CASTABLE_TO_TYPE_VAR(16);
+ TEST_CASTABLE_TO_TYPE_VAR(32);
+#if BITS_PER_LONG == 64
+ TEST_CASTABLE_TO_TYPE_VAR(64);
+#endif
+
+ TEST_CASTABLE_TO_TYPE_RANGE(8);
+ TEST_CASTABLE_TO_TYPE_RANGE(16);
+#if BITS_PER_LONG == 64
+ TEST_CASTABLE_TO_TYPE_RANGE(32);
+#endif
+ kunit_info(test, "%d castable_to_type() tests finished\n", count);
+
+#undef TEST_CASTABLE_TO_TYPE_RANGE
+#undef TEST_CASTABLE_TO_TYPE_VAR
+#undef TEST_CASTABLE_TO_TYPE
+}
+
static struct kunit_case overflow_test_cases[] = {
KUNIT_CASE(u8_u8__u8_overflow_test),
KUNIT_CASE(s8_s8__s8_overflow_test),
@@ -755,6 +1133,9 @@ static struct kunit_case overflow_test_cases[] = {
KUNIT_CASE(shift_nonsense_test),
KUNIT_CASE(overflow_allocation_test),
KUNIT_CASE(overflow_size_helpers_test),
+ KUNIT_CASE(overflows_type_test),
+ KUNIT_CASE(same_type_test),
+ KUNIT_CASE(castable_to_type_test),
{}
};