// SPDX-License-Identifier: GPL-2.0 OR MIT/* * Test cases for arithmetic overflow checks. See: * "Running tests with kunit_tool" at Documentation/dev-tools/kunit/start.rst * ./tools/testing/kunit/kunit.py run overflow [--raw_output] */#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <kunit/device.h>#include <kunit/test.h>#include <linux/device.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/overflow.h>#include <linux/slab.h>#include <linux/types.h>#include <linux/vmalloc.h> #define SKIP(cond, reason) do { \ if (cond) { \ kunit_skip(test, reason); \ return; \ } \} while (0) /* * Clang 11 and earlier generate unwanted libcalls for signed output * on unsigned input. */#if defined(CONFIG_CC_IS_CLANG) && __clang_major__ <= 11# define SKIP_SIGN_MISMATCH(t) SKIP(t, "Clang 11 unwanted libcalls")#else# define SKIP_SIGN_MISMATCH(t) do { } while (0)#endif /* * Clang 13 and earlier generate unwanted libcalls for 64-bit tests on * 32-bit hosts. */#if defined(CONFIG_CC_IS_CLANG) && __clang_major__ <= 13 && \ BITS_PER_LONG != 64# define SKIP_64_ON_32(t) SKIP(t, "Clang 13 unwanted libcalls")#else# define SKIP_64_ON_32(t) do { } while (0)#endif #define DEFINE_TEST_ARRAY_TYPED(t1, t2, t) \ static const struct test_ ## t1 ## _ ## t2 ## __ ## t { \ t1 a; \ t2 b; \ t sum, diff, prod; \ bool s_of, d_of, p_of; \ } t1 ## _ ## t2 ## __ ## t ## _tests[] #define DEFINE_TEST_ARRAY(t) DEFINE_TEST_ARRAY_TYPED(t, t, t) 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 { \ int _a_orig = a, _a_bump = a + 1; \ int _b_orig = b, _b_bump = b + 1; \ bool _of; \ t _r; \ \ _of = check_ ## op ## _overflow(a, b, &_r); \ KUNIT_EXPECT_EQ_MSG(test, _of, of, \ "expected check "fmt" "sym" "fmt" to%s overflow (type %s)\n", \ a, b, of ? "" : " not", #t); \ KUNIT_EXPECT_EQ_MSG(test, _r, r, \ "expected check "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ a, b, r, _r, #t); \ /* Check for internal macro side-effects. */ \ _of = check_ ## op ## _overflow(_a_orig++, _b_orig++, &_r); \ KUNIT_EXPECT_EQ_MSG(test, _a_orig, _a_bump, \ "Unexpected check " #op " macro side-effect!\n"); \ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, \ "Unexpected check " #op " macro side-effect!\n"); \ \ _r = wrapping_ ## op(t, a, b); \ KUNIT_EXPECT_TRUE_MSG(test, _r == r, \ "expected wrap "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ a, b, r, _r, #t); \ /* Check for internal macro side-effects. */ \ _a_orig = a; \ _b_orig = b; \ _r = wrapping_ ## op(t, _a_orig++, _b_orig++); \ KUNIT_EXPECT_EQ_MSG(test, _a_orig, _a_bump, \ "Unexpected wrap " #op " macro side-effect!\n"); \ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, \ "Unexpected wrap " #op " macro side-effect!\n"); \} while (0) static int global_counter;static void bump_counter(void){ global_counter++;} static int get_index(void){ volatile int index = 0; bump_counter(); return index;} #define check_self_op(fmt, op, sym, a, b) do { \ typeof(a + 0) _a = a; \ typeof(b + 0) _b = b; \ typeof(a + 0) _a_sym = a; \ typeof(a + 0) _a_orig[1] = { a }; \ typeof(b + 0) _b_orig = b; \ typeof(b + 0) _b_bump = b + 1; \ typeof(a + 0) _r; \ \ _a_sym sym _b; \ _r = wrapping_ ## op(_a, _b); \ KUNIT_EXPECT_TRUE_MSG(test, _r == _a_sym, \ "expected "fmt" "#op" "fmt" == "fmt", got "fmt"\n", \ a, b, _a_sym, _r); \ KUNIT_EXPECT_TRUE_MSG(test, _a == _a_sym, \ "expected "fmt" "#op" "fmt" == "fmt", got "fmt"\n", \ a, b, _a_sym, _a); \ /* Check for internal macro side-effects. */ \ global_counter = 0; \ wrapping_ ## op(_a_orig[get_index()], _b_orig++); \ KUNIT_EXPECT_EQ_MSG(test, global_counter, 1, \ "Unexpected wrapping_" #op " macro side-effect on arg1!\n"); \ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, \ "Unexpected wrapping_" #op " macro side-effect on arg2!\n"); \} while (0) #define DEFINE_TEST_FUNC_TYPED(n, t, fmt) \static void do_test_ ## n(struct kunit *test, const struct test_ ## n *p) \{ \ /* check_{add,sub,mul}_overflow() and wrapping_{add,sub,mul} */ \ 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); \ /* wrapping_assign_{add,sub}() */ \ check_self_op(fmt, assign_add, +=, p->a, p->b); \ check_self_op(fmt, assign_add, +=, p->b, p->a); \ check_self_op(fmt, assign_sub, -=, p->a, p->b); \} \ \static void n ## _overflow_test(struct kunit *test) { \ unsigned i; \ \ SKIP_64_ON_32(__same_type(t, u64)); \ SKIP_64_ON_32(__same_type(t, s64)); \ SKIP_SIGN_MISMATCH(__same_type(n ## _tests[0].a, u32) && \ __same_type(n ## _tests[0].b, u32) && \ __same_type(n ## _tests[0].sum, int)); \ \ for (i = 0; i < ARRAY_SIZE(n ## _tests); ++i) \ do_test_ ## n(test, &n ## _tests[i]); \ kunit_info(test, "%zu %s arithmetic tests finished\n", \ ARRAY_SIZE(n ## _tests), #n); \} #define DEFINE_TEST_FUNC(t, fmt) \ DEFINE_TEST_FUNC_TYPED(t ## _ ## t ## __ ## t, t, fmt) 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");DEFINE_TEST_FUNC(u64, "%llu");DEFINE_TEST_FUNC(s64, "%lld"); DEFINE_TEST_ARRAY_TYPED(u32, u32, u8) = { {0, 0, 0, 0, 0, false, false, false}, {U8_MAX, 2, 1, U8_MAX - 2, U8_MAX - 1, true, false, true}, {U8_MAX + 1, 0, 0, 0, 0, true, true, false},};DEFINE_TEST_FUNC_TYPED(u32_u32__u8, u8, "%d"); DEFINE_TEST_ARRAY_TYPED(u32, u32, int) = { {0, 0, 0, 0, 0, false, false, false}, {U32_MAX, 0, -1, -1, 0, true, true, false},};DEFINE_TEST_FUNC_TYPED(u32_u32__int, int, "%d"); DEFINE_TEST_ARRAY_TYPED(u8, u8, int) = { {0, 0, 0, 0, 0, false, false, false}, {U8_MAX, U8_MAX, 2 * U8_MAX, 0, U8_MAX * U8_MAX, false, false, false}, {1, 2, 3, -1, 2, false, false, false},};DEFINE_TEST_FUNC_TYPED(u8_u8__int, int, "%d"); DEFINE_TEST_ARRAY_TYPED(int, int, u8) = { {0, 0, 0, 0, 0, false, false, false}, {1, 2, 3, U8_MAX, 2, false, true, false}, {-1, 0, U8_MAX, U8_MAX, 0, true, true, false},};DEFINE_TEST_FUNC_TYPED(int_int__u8, u8, "%d"); /* Args are: value, shift, type, expected result, overflow expected */#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \ typeof(a) __a = (a); \ typeof(s) __s = (s); \ t __e = (expect); \ t __d; \ bool __of = check_shl_overflow(__a, __s, &__d); \ if (__of != of) { \ KUNIT_EXPECT_EQ_MSG(test, __of, of, \ "expected (%s)(%s << %s) to%s overflow\n", \ #t, #a, #s, of ? "" : " not"); \ } else if (!__of && __d != __e) { \ KUNIT_EXPECT_EQ_MSG(test, __d, __e, \ "expected (%s)(%s << %s) == %s\n", \ #t, #a, #s, #expect); \ if ((t)-1 < 0) \ kunit_info(test, "got %lld\n", (s64)__d); \ else \ kunit_info(test, "got %llu\n", (u64)__d); \ } \ count++; \} while (0) static void shift_sane_test(struct kunit *test){ int count = 0; /* Sane shifts. */ TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); /* Sane shift: start and end with 0, without a too-wide shift. */ TEST_ONE_SHIFT(0, 7, u8, 0, false); TEST_ONE_SHIFT(0, 15, u16, 0, false); TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); TEST_ONE_SHIFT(0, 31, u32, 0, false); TEST_ONE_SHIFT(0, 63, u64, 0, false); /* Sane shift: start and end with 0, without reaching signed bit. */ TEST_ONE_SHIFT(0, 6, s8, 0, false); TEST_ONE_SHIFT(0, 14, s16, 0, false); TEST_ONE_SHIFT(0, 30, int, 0, false); TEST_ONE_SHIFT(0, 30, s32, 0, false); TEST_ONE_SHIFT(0, 62, s64, 0, false); kunit_info(test, "%d sane shift tests finished\n", count);} static void shift_overflow_test(struct kunit *test){ int count = 0; /* Overflow: shifted the bit off the end. */ TEST_ONE_SHIFT(1, 8, u8, 0, true); TEST_ONE_SHIFT(1, 16, u16, 0, true); TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); TEST_ONE_SHIFT(1, 32, u32, 0, true); TEST_ONE_SHIFT(1, 64, u64, 0, true); /* Overflow: shifted into the signed bit. */ TEST_ONE_SHIFT(1, 7, s8, 0, true); TEST_ONE_SHIFT(1, 15, s16, 0, true); TEST_ONE_SHIFT(1, 31, int, 0, true); TEST_ONE_SHIFT(1, 31, s32, 0, true); TEST_ONE_SHIFT(1, 63, s64, 0, true); /* Overflow: high bit falls off unsigned types. */ /* 10010110 */ TEST_ONE_SHIFT(150, 1, u8, 0, true); /* 1000100010010110 */ TEST_ONE_SHIFT(34966, 1, u16, 0, true); /* 10000100000010001000100010010110 */ TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); /* 1000001000010000010000000100000010000100000010001000100010010110 */ TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); /* Overflow: bit shifted into signed bit on signed types. */ /* 01001011 */ TEST_ONE_SHIFT(75, 1, s8, 0, true); /* 0100010001001011 */ TEST_ONE_SHIFT(17483, 1, s16, 0, true);Lines 1–500 of 1262. 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// SPDX-License-Identifier: GPL-2.0 OR MIT /* * Test cases for arithmetic overflow checks. See: * "Running tests with kunit_tool" at Documentation/dev-tools/kunit/start.rst * ./tools/testing/kunit/kunit.py run overflow [--raw_output] */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <kunit/device.h> #include <kunit/test.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/overflow.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/vmalloc.h> #define SKIP(cond, reason) do { \ if (cond) { \ kunit_skip(test, reason); \ return; \ } \ } while (0) /* * Clang 11 and earlier generate unwanted libcalls for signed output * on unsigned input. */ #if defined(CONFIG_CC_IS_CLANG) && __clang_major__ <= 11 # define SKIP_SIGN_MISMATCH(t) SKIP(t, "Clang 11 unwanted libcalls") #else # define SKIP_SIGN_MISMATCH(t) do { } while (0) #endif /* * Clang 13 and earlier generate unwanted libcalls for 64-bit tests on * 32-bit hosts. */ #if defined(CONFIG_CC_IS_CLANG) && __clang_major__ <= 13 && \ BITS_PER_LONG != 64 # define SKIP_64_ON_32(t) SKIP(t, "Clang 13 unwanted libcalls") #else # define SKIP_64_ON_32(t) do { } while (0) #endif #define DEFINE_TEST_ARRAY_TYPED(t1, t2, t) \ static const struct test_ ## t1 ## _ ## t2 ## __ ## t { \ t1 a; \ t2 b; \ t sum, diff, prod; \ bool s_of, d_of, p_of; \ } t1 ## _ ## t2 ## __ ## t ## _tests[] #define DEFINE_TEST_ARRAY(t) DEFINE_TEST_ARRAY_TYPED(t, t, t) 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 { \ int _a_orig = a, _a_bump = a + 1; \ int _b_orig = b, _b_bump = b + 1; \ bool _of; \ t _r; \ \ _of = check_ ## op ## _overflow(a, b, &_r); \ KUNIT_EXPECT_EQ_MSG(test, _of, of, \ "expected check "fmt" "sym" "fmt" to%s overflow (type %s)\n", \ a, b, of ? "" : " not", #t); \ KUNIT_EXPECT_EQ_MSG(test, _r, r, \ "expected check "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ a, b, r, _r, #t); \ /* Check for internal macro side-effects. */ \ _of = check_ ## op ## _overflow(_a_orig++, _b_orig++, &_r); \ KUNIT_EXPECT_EQ_MSG(test, _a_orig, _a_bump, \ "Unexpected check " #op " macro side-effect!\n"); \ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, \ "Unexpected check " #op " macro side-effect!\n"); \ \ _r = wrapping_ ## op(t, a, b); \ KUNIT_EXPECT_TRUE_MSG(test, _r == r, \ "expected wrap "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ a, b, r, _r, #t); \ /* Check for internal macro side-effects. */ \ _a_orig = a; \ _b_orig = b; \ _r = wrapping_ ## op(t, _a_orig++, _b_orig++); \ KUNIT_EXPECT_EQ_MSG(test, _a_orig, _a_bump, \ "Unexpected wrap " #op " macro side-effect!\n"); \ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, \ "Unexpected wrap " #op " macro side-effect!\n"); \ } while (0) static int global_counter; static void bump_counter(void) { global_counter++; } static int get_index(void) { volatile int index = 0; bump_counter(); return index; } #define check_self_op(fmt, op, sym, a, b) do { \ typeof(a + 0) _a = a; \ typeof(b + 0) _b = b; \ typeof(a + 0) _a_sym = a; \ typeof(a + 0) _a_orig[1] = { a }; \ typeof(b + 0) _b_orig = b; \ typeof(b + 0) _b_bump = b + 1; \ typeof(a + 0) _r; \ \ _a_sym sym _b; \ _r = wrapping_ ## op(_a, _b); \ KUNIT_EXPECT_TRUE_MSG(test, _r == _a_sym, \ "expected "fmt" "#op" "fmt" == "fmt", got "fmt"\n", \ a, b, _a_sym, _r); \ KUNIT_EXPECT_TRUE_MSG(test, _a == _a_sym, \ "expected "fmt" "#op" "fmt" == "fmt", got "fmt"\n", \ a, b, _a_sym, _a); \ /* Check for internal macro side-effects. */ \ global_counter = 0; \ wrapping_ ## op(_a_orig[get_index()], _b_orig++); \ KUNIT_EXPECT_EQ_MSG(test, global_counter, 1, \ "Unexpected wrapping_" #op " macro side-effect on arg1!\n"); \ KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, \ "Unexpected wrapping_" #op " macro side-effect on arg2!\n"); \ } while (0) #define DEFINE_TEST_FUNC_TYPED(n, t, fmt) \ static void do_test_ ## n(struct kunit *test, const struct test_ ## n *p) \ { \ /* check_{add,sub,mul}_overflow() and wrapping_{add,sub,mul} */ \ 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); \ /* wrapping_assign_{add,sub}() */ \ check_self_op(fmt, assign_add, +=, p->a, p->b); \ check_self_op(fmt, assign_add, +=, p->b, p->a); \ check_self_op(fmt, assign_sub, -=, p->a, p->b); \ } \ \ static void n ## _overflow_test(struct kunit *test) { \ unsigned i; \ \ SKIP_64_ON_32(__same_type(t, u64)); \ SKIP_64_ON_32(__same_type(t, s64)); \ SKIP_SIGN_MISMATCH(__same_type(n ## _tests[0].a, u32) && \ __same_type(n ## _tests[0].b, u32) && \ __same_type(n ## _tests[0].sum, int)); \ \ for (i = 0; i < ARRAY_SIZE(n ## _tests); ++i) \ do_test_ ## n(test, &n ## _tests[i]); \ kunit_info(test, "%zu %s arithmetic tests finished\n", \ ARRAY_SIZE(n ## _tests), #n); \ } #define DEFINE_TEST_FUNC(t, fmt) \ DEFINE_TEST_FUNC_TYPED(t ## _ ## t ## __ ## t, t, fmt) 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"); DEFINE_TEST_FUNC(u64, "%llu"); DEFINE_TEST_FUNC(s64, "%lld"); DEFINE_TEST_ARRAY_TYPED(u32, u32, u8) = { {0, 0, 0, 0, 0, false, false, false}, {U8_MAX, 2, 1, U8_MAX - 2, U8_MAX - 1, true, false, true}, {U8_MAX + 1, 0, 0, 0, 0, true, true, false}, }; DEFINE_TEST_FUNC_TYPED(u32_u32__u8, u8, "%d"); DEFINE_TEST_ARRAY_TYPED(u32, u32, int) = { {0, 0, 0, 0, 0, false, false, false}, {U32_MAX, 0, -1, -1, 0, true, true, false}, }; DEFINE_TEST_FUNC_TYPED(u32_u32__int, int, "%d"); DEFINE_TEST_ARRAY_TYPED(u8, u8, int) = { {0, 0, 0, 0, 0, false, false, false}, {U8_MAX, U8_MAX, 2 * U8_MAX, 0, U8_MAX * U8_MAX, false, false, false}, {1, 2, 3, -1, 2, false, false, false}, }; DEFINE_TEST_FUNC_TYPED(u8_u8__int, int, "%d"); DEFINE_TEST_ARRAY_TYPED(int, int, u8) = { {0, 0, 0, 0, 0, false, false, false}, {1, 2, 3, U8_MAX, 2, false, true, false}, {-1, 0, U8_MAX, U8_MAX, 0, true, true, false}, }; DEFINE_TEST_FUNC_TYPED(int_int__u8, u8, "%d"); /* Args are: value, shift, type, expected result, overflow expected */ #define TEST_ONE_SHIFT(a, s, t, expect, of) do { \ typeof(a) __a = (a); \ typeof(s) __s = (s); \ t __e = (expect); \ t __d; \ bool __of = check_shl_overflow(__a, __s, &__d); \ if (__of != of) { \ KUNIT_EXPECT_EQ_MSG(test, __of, of, \ "expected (%s)(%s << %s) to%s overflow\n", \ #t, #a, #s, of ? "" : " not"); \ } else if (!__of && __d != __e) { \ KUNIT_EXPECT_EQ_MSG(test, __d, __e, \ "expected (%s)(%s << %s) == %s\n", \ #t, #a, #s, #expect); \ if ((t)-1 < 0) \ kunit_info(test, "got %lld\n", (s64)__d); \ else \ kunit_info(test, "got %llu\n", (u64)__d); \ } \ count++; \ } while (0) static void shift_sane_test(struct kunit *test) { int count = 0; /* Sane shifts. */ TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); /* Sane shift: start and end with 0, without a too-wide shift. */ TEST_ONE_SHIFT(0, 7, u8, 0, false); TEST_ONE_SHIFT(0, 15, u16, 0, false); TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); TEST_ONE_SHIFT(0, 31, u32, 0, false); TEST_ONE_SHIFT(0, 63, u64, 0, false); /* Sane shift: start and end with 0, without reaching signed bit. */ TEST_ONE_SHIFT(0, 6, s8, 0, false); TEST_ONE_SHIFT(0, 14, s16, 0, false); TEST_ONE_SHIFT(0, 30, int, 0, false); TEST_ONE_SHIFT(0, 30, s32, 0, false); TEST_ONE_SHIFT(0, 62, s64, 0, false); kunit_info(test, "%d sane shift tests finished\n", count); } static void shift_overflow_test(struct kunit *test) { int count = 0; /* Overflow: shifted the bit off the end. */ TEST_ONE_SHIFT(1, 8, u8, 0, true); TEST_ONE_SHIFT(1, 16, u16, 0, true); TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); TEST_ONE_SHIFT(1, 32, u32, 0, true); TEST_ONE_SHIFT(1, 64, u64, 0, true); /* Overflow: shifted into the signed bit. */ TEST_ONE_SHIFT(1, 7, s8, 0, true); TEST_ONE_SHIFT(1, 15, s16, 0, true); TEST_ONE_SHIFT(1, 31, int, 0, true); TEST_ONE_SHIFT(1, 31, s32, 0, true); TEST_ONE_SHIFT(1, 63, s64, 0, true); /* Overflow: high bit falls off unsigned types. */ /* 10010110 */ TEST_ONE_SHIFT(150, 1, u8, 0, true); /* 1000100010010110 */ TEST_ONE_SHIFT(34966, 1, u16, 0, true); /* 10000100000010001000100010010110 */ TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); /* 1000001000010000010000000100000010000100000010001000100010010110 */ TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); /* Overflow: bit shifted into signed bit on signed types. */ /* 01001011 */ TEST_ONE_SHIFT(75, 1, s8, 0, true); /* 0100010001001011 */ TEST_ONE_SHIFT(17483, 1, s16, 0, true);