[thirdparty/linux.git] / lib / test_overflow.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
 * Test cases for arithmetic overflow checks.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/types.h>

#define DEFINE_TEST_ARRAY(t)			\
	static const struct test_ ## t {	\
		t a, b;				\
		t sum, diff, prod;		\
		bool s_of, d_of, p_of;		\
	} t ## _tests[] __initconst

DEFINE_TEST_ARRAY(u8) = {
	{0, 0, 0, 0, 0, false, false, false},
	{1, 1, 2, 0, 1, false, false, false},
	{0, 1, 1, U8_MAX, 0, false, true, false},
	{1, 0, 1, 1, 0, false, false, false},
	{0, U8_MAX, U8_MAX, 1, 0, false, true, false},
	{U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false},
	{1, U8_MAX, 0, 2, U8_MAX, true, true, false},
	{U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false},
	{U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true},

	{U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true},
	{U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true},

	{1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false},
	{1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true},
	{1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false},
	{1U << 7, 1U << 7, 0, 0, 0, true, false, true},

	{48, 32, 80, 16, 0, false, false, true},
	{128, 128, 0, 0, 0, true, false, true},
	{123, 234, 101, 145, 110, true, true, true},
};
DEFINE_TEST_ARRAY(u16) = {
	{0, 0, 0, 0, 0, false, false, false},
	{1, 1, 2, 0, 1, false, false, false},
	{0, 1, 1, U16_MAX, 0, false, true, false},
	{1, 0, 1, 1, 0, false, false, false},
	{0, U16_MAX, U16_MAX, 1, 0, false, true, false},
	{U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false},
	{1, U16_MAX, 0, 2, U16_MAX, true, true, false},
	{U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false},
	{U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true},

	{U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true},
	{U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true},

	{1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false},
	{1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true},
	{1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false},
	{1U << 15, 1U << 15, 0, 0, 0, true, false, true},

	{123, 234, 357, 65425, 28782, false, true, false},
	{1234, 2345, 3579, 64425, 10146, false, true, true},
};
DEFINE_TEST_ARRAY(u32) = {
	{0, 0, 0, 0, 0, false, false, false},
	{1, 1, 2, 0, 1, false, false, false},
	{0, 1, 1, U32_MAX, 0, false, true, false},
	{1, 0, 1, 1, 0, false, false, false},
	{0, U32_MAX, U32_MAX, 1, 0, false, true, false},
	{U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false},
	{1, U32_MAX, 0, 2, U32_MAX, true, true, false},
	{U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false},
	{U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true},

	{U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true},
	{U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true},

	{1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false},
	{1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true},
	{1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false},
	{1U << 31, 1U << 31, 0, 0, 0, true, false, true},

	{-2U, 1U, -1U, -3U, -2U, false, false, false},
	{-4U, 5U, 1U, -9U, -20U, true, false, true},
};

DEFINE_TEST_ARRAY(u64) = {
	{0, 0, 0, 0, 0, false, false, false},
	{1, 1, 2, 0, 1, false, false, false},
	{0, 1, 1, U64_MAX, 0, false, true, false},
	{1, 0, 1, 1, 0, false, false, false},
	{0, U64_MAX, U64_MAX, 1, 0, false, true, false},
	{U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false},
	{1, U64_MAX, 0, 2, U64_MAX, true, true, false},
	{U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false},
	{U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true},

	{U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true},
	{U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true},

	{1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false},
	{1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true},
	{1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false},
	{1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true},
	{1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */,
	 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL,
	 false, true, false},
	{-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true},
};

DEFINE_TEST_ARRAY(s8) = {
	{0, 0, 0, 0, 0, false, false, false},

	{0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false},
	{S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false},
	{0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false},
	{S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false},

	{-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true},
	{S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true},
	{-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false},
	{S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false},
	{-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false},
	{-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false},

	{1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false},
	{S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false},
	{1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false},
	{S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false},

	{S8_MIN, S8_MIN, 0, 0, 0, true, false, true},
	{S8_MAX, S8_MAX, -2, 0, 1, true, false, true},

	{-4, -32, -36, 28, -128, false, false, true},
	{-4, 32, 28, -36, -128, false, false, false},
};

DEFINE_TEST_ARRAY(s16) = {
	{0, 0, 0, 0, 0, false, false, false},

	{0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false},
	{S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false},
	{0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false},
	{S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false},

	{-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true},
	{S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true},
	{-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false},
	{S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false},
	{-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false},
	{-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false},

	{1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false},
	{S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false},
	{1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false},
	{S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false},

	{S16_MIN, S16_MIN, 0, 0, 0, true, false, true},
	{S16_MAX, S16_MAX, -2, 0, 1, true, false, true},
};
DEFINE_TEST_ARRAY(s32) = {
	{0, 0, 0, 0, 0, false, false, false},

	{0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false},
	{S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false},
	{0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false},
	{S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false},

	{-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true},
	{S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true},
	{-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false},
	{S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false},
	{-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false},
	{-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false},

	{1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false},
	{S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false},
	{1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false},
	{S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false},

	{S32_MIN, S32_MIN, 0, 0, 0, true, false, true},
	{S32_MAX, S32_MAX, -2, 0, 1, true, false, true},
};
DEFINE_TEST_ARRAY(s64) = {
	{0, 0, 0, 0, 0, false, false, false},

	{0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false},
	{S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false},
	{0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false},
	{S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false},

	{-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true},
	{S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true},
	{-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false},
	{S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false},
	{-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false},
	{-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false},

	{1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false},
	{S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false},
	{1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false},
	{S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false},

	{S64_MIN, S64_MIN, 0, 0, 0, true, false, true},
	{S64_MAX, S64_MAX, -2, 0, 1, true, false, true},

	{-1, -1, -2, 0, 1, false, false, false},
	{-1, -128, -129, 127, 128, false, false, false},
	{-128, -1, -129, -127, 128, false, false, false},
	{0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false},
};

#define check_one_op(t, fmt, op, sym, a, b, r, of) do {		\
	t _r;							\
	bool _of;						\
								\
	_of = check_ ## op ## _overflow(a, b, &_r);		\
	if (_of != of) {					\
		pr_warn("expected "fmt" "sym" "fmt		\
			" to%s overflow (type %s)\n",		\
			a, b, of ? "" : " not", #t);		\
	}							\
	if (_r != r) {						\
		pr_warn("expected "fmt" "sym" "fmt" == "	\
			fmt", got "fmt" (type %s)\n",		\
			a, b, r, _r, #t);			\
	}							\
} while (0)

#define DEFINE_TEST_FUNC(t, fmt)					\
static void __init do_test_ ## t(const struct test_ ## t *p)		\
{							   		\
	check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of);	\
	check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of);	\
	check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of);	\
	check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of);	\
	check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of);	\
}									\
									\
static void __init test_ ## t ## _overflow(void) {			\
	unsigned i;							\
									\
	pr_info("%-3s: %zu tests\n", #t, ARRAY_SIZE(t ## _tests));	\
	for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i)			\
		do_test_ ## t(&t ## _tests[i]);				\
}

DEFINE_TEST_FUNC(u8, "%d");
DEFINE_TEST_FUNC(s8, "%d");
DEFINE_TEST_FUNC(u16, "%d");
DEFINE_TEST_FUNC(s16, "%d");
DEFINE_TEST_FUNC(u32, "%u");
DEFINE_TEST_FUNC(s32, "%d");
#if BITS_PER_LONG == 64
DEFINE_TEST_FUNC(u64, "%llu");
DEFINE_TEST_FUNC(s64, "%lld");
#endif

static int __init test_overflow(void)
{
	test_u8_overflow();
	test_s8_overflow();
	test_u16_overflow();
	test_s16_overflow();
	test_u32_overflow();
	test_s32_overflow();
#if BITS_PER_LONG == 64
	test_u64_overflow();
	test_s64_overflow();
#endif

	pr_info("done\n");

	return 0;
}

static void __exit test_module_exit(void)
{ }

module_init(test_overflow);
module_exit(test_module_exit);
MODULE_LICENSE("Dual MIT/GPL");
Commit	Line	Data
455a35a6 RV	1	// SPDX-License-Identifier: GPL-2.0 OR MIT
	2	/*
	3	* Test cases for arithmetic overflow checks.
	4	*/
	5	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	6
	7	#include <linux/init.h>
	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/overflow.h>
	11	#include <linux/types.h>
	12
	13	#define DEFINE_TEST_ARRAY(t) \
	14	static const struct test_ ## t { \
	15	t a, b; \
	16	t sum, diff, prod; \
	17	bool s_of, d_of, p_of; \
	18	} t ## _tests[] __initconst
	19
	20	DEFINE_TEST_ARRAY(u8) = {
	21	{0, 0, 0, 0, 0, false, false, false},
	22	{1, 1, 2, 0, 1, false, false, false},
	23	{0, 1, 1, U8_MAX, 0, false, true, false},
	24	{1, 0, 1, 1, 0, false, false, false},
	25	{0, U8_MAX, U8_MAX, 1, 0, false, true, false},
	26	{U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false},
	27	{1, U8_MAX, 0, 2, U8_MAX, true, true, false},
	28	{U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false},
	29	{U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true},
	30
	31	{U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true},
	32	{U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true},
	33
	34	{1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false},
	35	{1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true},
	36	{1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false},
	37	{1U << 7, 1U << 7, 0, 0, 0, true, false, true},
	38
	39	{48, 32, 80, 16, 0, false, false, true},
	40	{128, 128, 0, 0, 0, true, false, true},
	41	{123, 234, 101, 145, 110, true, true, true},
	42	};
	43	DEFINE_TEST_ARRAY(u16) = {
	44	{0, 0, 0, 0, 0, false, false, false},
	45	{1, 1, 2, 0, 1, false, false, false},
	46	{0, 1, 1, U16_MAX, 0, false, true, false},
	47	{1, 0, 1, 1, 0, false, false, false},
	48	{0, U16_MAX, U16_MAX, 1, 0, false, true, false},
	49	{U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false},
	50	{1, U16_MAX, 0, 2, U16_MAX, true, true, false},
	51	{U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false},
	52	{U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true},
	53
	54	{U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true},
	55	{U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true},
	56
	57	{1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false},
	58	{1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true},
	59	{1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false},
	60	{1U << 15, 1U << 15, 0, 0, 0, true, false, true},
	61
	62	{123, 234, 357, 65425, 28782, false, true, false},
	63	{1234, 2345, 3579, 64425, 10146, false, true, true},
	64	};
65	DEFINE_TEST_ARRAY(u32) = {
66	{0, 0, 0, 0, 0, false, false, false},
67	{1, 1, 2, 0, 1, false, false, false},
68	{0, 1, 1, U32_MAX, 0, false, true, false},
69	{1, 0, 1, 1, 0, false, false, false},
70	{0, U32_MAX, U32_MAX, 1, 0, false, true, false},
71	{U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false},
72	{1, U32_MAX, 0, 2, U32_MAX, true, true, false},
73	{U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false},
74	{U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true},
75
76	{U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true},
77	{U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true},
78
79	{1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false},
80	{1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true},
81	{1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false},
82	{1U << 31, 1U << 31, 0, 0, 0, true, false, true},
83
84	{-2U, 1U, -1U, -3U, -2U, false, false, false},
85	{-4U, 5U, 1U, -9U, -20U, true, false, true},
86	};
87
88	DEFINE_TEST_ARRAY(u64) = {
89	{0, 0, 0, 0, 0, false, false, false},
90	{1, 1, 2, 0, 1, false, false, false},
91	{0, 1, 1, U64_MAX, 0, false, true, false},
92	{1, 0, 1, 1, 0, false, false, false},
93	{0, U64_MAX, U64_MAX, 1, 0, false, true, false},
94	{U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false},
95	{1, U64_MAX, 0, 2, U64_MAX, true, true, false},
96	{U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false},
97	{U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true},
98
99	{U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true},
100	{U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true},
101
102	{1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false},
103	{1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true},
104	{1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false},
105	{1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true},
106	{1000000000ULL /* 10^9 /, 10000000000ULL / 10^10 */,
107	11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL,
108	false, true, false},
109	{-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true},
110	};
111
112	DEFINE_TEST_ARRAY(s8) = {
113	{0, 0, 0, 0, 0, false, false, false},
114
115	{0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false},
116	{S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false},
117	{0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false},
118	{S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false},
119
120	{-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true},
121	{S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true},
122	{-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false},
123	{S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false},
124	{-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false},
125	{-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false},
126
127	{1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false},
128	{S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false},
129	{1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false},
130	{S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false},
131
132	{S8_MIN, S8_MIN, 0, 0, 0, true, false, true},
133	{S8_MAX, S8_MAX, -2, 0, 1, true, false, true},
134
135	{-4, -32, -36, 28, -128, false, false, true},
136	{-4, 32, 28, -36, -128, false, false, false},
137	};
138
139	DEFINE_TEST_ARRAY(s16) = {
140	{0, 0, 0, 0, 0, false, false, false},
141
142	{0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false},
143	{S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false},
144	{0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false},
145	{S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false},
146
147	{-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true},
148	{S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true},
149	{-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false},
150	{S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false},
151	{-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false},
152	{-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false},
153
154	{1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false},
155	{S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false},
156	{1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false},
157	{S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false},
158
159	{S16_MIN, S16_MIN, 0, 0, 0, true, false, true},
160	{S16_MAX, S16_MAX, -2, 0, 1, true, false, true},
161	};
162	DEFINE_TEST_ARRAY(s32) = {
163	{0, 0, 0, 0, 0, false, false, false},
164
165	{0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false},
166	{S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false},
167	{0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false},
168	{S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false},
169
170	{-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true},
171	{S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true},
172	{-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false},
173	{S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false},
174	{-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false},
175	{-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false},
176
177	{1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false},
178	{S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false},
179	{1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false},
180	{S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false},
181
182	{S32_MIN, S32_MIN, 0, 0, 0, true, false, true},
183	{S32_MAX, S32_MAX, -2, 0, 1, true, false, true},
184	};
185	DEFINE_TEST_ARRAY(s64) = {
186	{0, 0, 0, 0, 0, false, false, false},
187
188	{0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false},
189	{S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false},
190	{0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false},
191	{S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false},
192
193	{-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true},
194	{S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true},
195	{-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false},
196	{S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false},
197	{-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false},
198	{-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false},
199
200	{1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false},
201	{S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false},
202	{1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false},
203	{S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false},
204
205	{S64_MIN, S64_MIN, 0, 0, 0, true, false, true},
206	{S64_MAX, S64_MAX, -2, 0, 1, true, false, true},
207
208	{-1, -1, -2, 0, 1, false, false, false},
209	{-1, -128, -129, 127, 128, false, false, false},
210	{-128, -1, -129, -127, 128, false, false, false},
211	{0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false},
212	};
213
6d334432 RV	214	#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \
	215	t _r; \
	216	bool _of; \
	217	\
	218	_of = check_ ## op ## _overflow(a, b, &_r); \
	219	if (_of != of) { \
	220	pr_warn("expected "fmt" "sym" "fmt \
	221	" to%s overflow (type %s)\n", \
	222	a, b, of ? "" : " not", #t); \
	223	} \
	224	if (_r != r) { \
	225	pr_warn("expected "fmt" "sym" "fmt" == " \
	226	fmt", got "fmt" (type %s)\n", \
	227	a, b, r, _r, #t); \
	228	} \
	229	} while (0)
	230
455a35a6 RV	231	#define DEFINE_TEST_FUNC(t, fmt) \
	232	static void __init do_test_ ## t(const struct test_ ## t *p) \
	233	{ \
6d334432 RV	234	check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
	235	check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
	236	check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \
	237	check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \
	238	check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
455a35a6 RV	239	} \
	240	\
	241	static void __init test_ ## t ## _overflow(void) { \
	242	unsigned i; \
	243	\
	244	pr_info("%-3s: %zu tests\n", #t, ARRAY_SIZE(t ## _tests)); \
	245	for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \
	246	do_test_ ## t(&t ## _tests[i]); \
	247	}
	248
	249	DEFINE_TEST_FUNC(u8, "%d");
	250	DEFINE_TEST_FUNC(s8, "%d");
	251	DEFINE_TEST_FUNC(u16, "%d");
	252	DEFINE_TEST_FUNC(s16, "%d");
	253	DEFINE_TEST_FUNC(u32, "%u");
	254	DEFINE_TEST_FUNC(s32, "%d");
	255	#if BITS_PER_LONG == 64
	256	DEFINE_TEST_FUNC(u64, "%llu");
	257	DEFINE_TEST_FUNC(s64, "%lld");
	258	#endif
	259
	260	static int __init test_overflow(void)
	261	{
	262	test_u8_overflow();
	263	test_s8_overflow();
	264	test_u16_overflow();
	265	test_s16_overflow();
	266	test_u32_overflow();
	267	test_s32_overflow();
	268	#if BITS_PER_LONG == 64
	269	test_u64_overflow();
	270	test_s64_overflow();
	271	#endif
	272
	273	pr_info("done\n");
	274
	275	return 0;
	276	}
	277
	278	static void __exit test_module_exit(void)
	279	{ }
	280
	281	module_init(test_overflow);
	282	module_exit(test_module_exit);
	283	MODULE_LICENSE("Dual MIT/GPL");