// SPDX-License-Identifier: GPL-2.0 OR MIT /* * Test cases for arithmetic overflow checks. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/device.h> #include <linux/init.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 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); \ err = 1; \ } \ if (_r != r) { \ pr_warn("expected "fmt" "sym" "fmt" == " \ fmt", got "fmt" (type %s)\n", \ a, b, r, _r, #t); \ err = 1; \ } \ } while (0) #define DEFINE_TEST_FUNC(t, fmt) \ static int __init do_test_ ## t(const struct test_ ## t *p) \ { \ int err = 0; \ \ 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); \ \ return err; \ } \ \ static int __init test_ ## t ## _overflow(void) { \ int err = 0; \ unsigned i; \ \ pr_info("%-3s: %zu arithmetic tests\n", #t, \ ARRAY_SIZE(t ## _tests)); \ for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ err |= do_test_ ## t(&t ## _tests[i]); \ return err; \ } 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_calculation(void) { int err = 0; err |= test_u8_overflow(); err |= test_s8_overflow(); err |= test_u16_overflow(); err |= test_s16_overflow(); err |= test_u32_overflow(); err |= test_s32_overflow(); #if BITS_PER_LONG == 64 err |= test_u64_overflow(); err |= test_s64_overflow(); #endif return err; } static int __init test_overflow_shift(void) { int err = 0; /* Args are: value, shift, type, expected result, overflow expected */ #define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \ int __failed = 0; \ typeof(a) __a = (a); \ typeof(s) __s = (s); \ t __e = (expect); \ t __d; \ bool __of = check_shl_overflow(__a, __s, &__d); \ if (__of != of) { \ pr_warn("expected (%s)(%s << %s) to%s overflow\n", \ #t, #a, #s, of ? "" : " not"); \ __failed = 1; \ } else if (!__of && __d != __e) { \ pr_warn("expected (%s)(%s << %s) == %s\n", \ #t, #a, #s, #expect); \ if ((t)-1 < 0) \ pr_warn("got %lld\n", (s64)__d); \ else \ pr_warn("got %llu\n", (u64)__d); \ __failed = 1; \ } \ if (!__failed) \ pr_info("ok: (%s)(%s << %s) == %s\n", #t, #a, #s, \ of ? "overflow" : #expect); \ __failed; \ }) /* Sane shifts. */ err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); /* Sane shift: start and end with 0, without a too-wide shift. */ err |= TEST_ONE_SHIFT(0, 7, u8, 0, false); err |= TEST_ONE_SHIFT(0, 15, u16, 0, false); err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); err |= TEST_ONE_SHIFT(0, 31, u32, 0, false); err |= TEST_ONE_SHIFT(0, 63, u64, 0, false); /* Sane shift: start and end with 0, without reaching signed bit. */ err |= TEST_ONE_SHIFT(0, 6, s8, 0, false); err |= TEST_ONE_SHIFT(0, 14, s16, 0, false); err |= TEST_ONE_SHIFT(0, 30, int, 0, false); err |= TEST_ONE_SHIFT(0, 30, s32, 0, false); err |= TEST_ONE_SHIFT(0, 62, s64, 0, false); /* Overflow: shifted the bit off the end. */ err |= TEST_ONE_SHIFT(1, 8, u8, 0, true); err |= TEST_ONE_SHIFT(1, 16, u16, 0, true); err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); err |= TEST_ONE_SHIFT(1, 32, u32, 0, true); err |= TEST_ONE_SHIFT(1, 64, u64, 0, true); /* Overflow: shifted into the signed bit. */ err |= TEST_ONE_SHIFT(1, 7, s8, 0, true); err |= TEST_ONE_SHIFT(1, 15, s16, 0, true); err |= TEST_ONE_SHIFT(1, 31, int, 0, true); err |= TEST_ONE_SHIFT(1, 31, s32, 0, true); err |= TEST_ONE_SHIFT(1, 63, s64, 0, true); /* Overflow: high bit falls off unsigned types. */ /* 10010110 */ err |= TEST_ONE_SHIFT(150, 1, u8, 0, true); /* 1000100010010110 */ err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true); /* 10000100000010001000100010010110 */ err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); /* 1000001000010000010000000100000010000100000010001000100010010110 */ err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); /* Overflow: bit shifted into signed bit on signed types. */ /* 01001011 */ err |= TEST_ONE_SHIFT(75, 1, s8, 0, true); /* 0100010001001011 */ err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true); /* 01000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true); /* 0100000100001000001000000010000001000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); /* Overflow: bit shifted past signed bit on signed types. */ /* 01001011 */ err |= TEST_ONE_SHIFT(75, 2, s8, 0, true); /* 0100010001001011 */ err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true); /* 01000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true); /* 0100000100001000001000000010000001000010000001000100010001001011 */ err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); /* Overflow: values larger than destination type. */ err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true); err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); /* Nonsense: negative initial value. */ err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true); err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true); err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true); err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true); err |= TEST_ONE_SHIFT(-10, 0, int, 0, true); err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true); err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true); err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true); err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true); /* Nonsense: negative shift values. */ err |= TEST_ONE_SHIFT(0, -5, s8, 0, true); err |= TEST_ONE_SHIFT(0, -5, u8, 0, true); err |= TEST_ONE_SHIFT(0, -10, s16, 0, true); err |= TEST_ONE_SHIFT(0, -10, u16, 0, true); err |= TEST_ONE_SHIFT(0, -15, int, 0, true); err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); err |= TEST_ONE_SHIFT(0, -20, s32, 0, true); err |= TEST_ONE_SHIFT(0, -20, u32, 0, true); err |= TEST_ONE_SHIFT(0, -30, s64, 0, true); err |= TEST_ONE_SHIFT(0, -30, u64, 0, true); /* Overflow: shifted at or beyond entire type's bit width. */ err |= TEST_ONE_SHIFT(0, 8, u8, 0, true); err |= TEST_ONE_SHIFT(0, 9, u8, 0, true); err |= TEST_ONE_SHIFT(0, 8, s8, 0, true); err |= TEST_ONE_SHIFT(0, 9, s8, 0, true); err |= TEST_ONE_SHIFT(0, 16, u16, 0, true); err |= TEST_ONE_SHIFT(0, 17, u16, 0, true); err |= TEST_ONE_SHIFT(0, 16, s16, 0, true); err |= TEST_ONE_SHIFT(0, 17, s16, 0, true); err |= TEST_ONE_SHIFT(0, 32, u32, 0, true); err |= TEST_ONE_SHIFT(0, 33, u32, 0, true); err |= TEST_ONE_SHIFT(0, 32, int, 0, true); err |= TEST_ONE_SHIFT(0, 33, int, 0, true); err |= TEST_ONE_SHIFT(0, 32, s32, 0, true); err |= TEST_ONE_SHIFT(0, 33, s32, 0, true); err |= TEST_ONE_SHIFT(0, 64, u64, 0, true); err |= TEST_ONE_SHIFT(0, 65, u64, 0, true); err |= TEST_ONE_SHIFT(0, 64, s64, 0, true); err |= TEST_ONE_SHIFT(0, 65, s64, 0, true); /* * Corner case: for unsigned types, we fail when we've shifted * through the entire width of bits. For signed types, we might * want to match this behavior, but that would mean noticing if * we shift through all but the signed bit, and this is not * currently detected (but we'll notice an overflow into the * signed bit). So, for now, we will test this condition but * mark it as not expected to overflow. */ err |= TEST_ONE_SHIFT(0, 7, s8, 0, false); err |= TEST_ONE_SHIFT(0, 15, s16, 0, false); err |= TEST_ONE_SHIFT(0, 31, int, 0, false); err |= TEST_ONE_SHIFT(0, 31, s32, 0, false); err |= TEST_ONE_SHIFT(0, 63, s64, 0, false); return err; } /* * Deal with the various forms of allocator arguments. See comments above * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". */ #define alloc010(alloc, arg, sz) alloc(sz, GFP_KERNEL) #define alloc011(alloc, arg, sz) alloc(sz, GFP_KERNEL, NUMA_NO_NODE) #define alloc000(alloc, arg, sz) alloc(sz) #define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) #define alloc110(alloc, arg, sz) alloc(arg, sz, GFP_KERNEL) #define free0(free, arg, ptr) free(ptr) #define free1(free, arg, ptr) free(arg, ptr) /* Wrap around to 8K */ #define TEST_SIZE (9 << PAGE_SHIFT) #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ static int __init test_ ## func (void *arg) \ { \ volatile size_t a = TEST_SIZE; \ volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ void *ptr; \ \ /* Tiny allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ if (!ptr) { \ pr_warn(#func " failed regular allocation?!\n"); \ return 1; \ } \ free ## want_arg (free_func, arg, ptr); \ \ /* Wrapped allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ a * b); \ if (!ptr) { \ pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \ return 1; \ } \ free ## want_arg (free_func, arg, ptr); \ \ /* Saturated allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ array_size(a, b)); \ if (ptr) { \ pr_warn(#func " missed saturation!\n"); \ free ## want_arg (free_func, arg, ptr); \ return 1; \ } \ pr_info(#func " detected saturation\n"); \ return 0; \ } /* * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node()) * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc()) * Allocator uses a special leading argument + | | (e.g. devm_kmalloc()) * | | | */ DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0); DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1); DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0); DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1); DEFINE_TEST_ALLOC(vmalloc, vfree, 0, 0, 0); DEFINE_TEST_ALLOC(vmalloc_node, vfree, 0, 0, 1); DEFINE_TEST_ALLOC(vzalloc, vfree, 0, 0, 0); DEFINE_TEST_ALLOC(vzalloc_node, vfree, 0, 0, 1); DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0); DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1); DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0); DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); static int __init test_overflow_allocation(void) { const char device_name[] = "overflow-test"; struct device *dev; int err = 0; /* Create dummy device for devm_kmalloc()-family tests. */ dev = root_device_register(device_name); if (IS_ERR(dev)) { pr_warn("Cannot register test device\n"); return 1; } err |= test_kmalloc(NULL); err |= test_kmalloc_node(NULL); err |= test_kzalloc(NULL); err |= test_kzalloc_node(NULL); err |= test_kvmalloc(NULL); err |= test_kvmalloc_node(NULL); err |= test_kvzalloc(NULL); err |= test_kvzalloc_node(NULL); err |= test_vmalloc(NULL); err |= test_vmalloc_node(NULL); err |= test_vzalloc(NULL); err |= test_vzalloc_node(NULL); err |= test_devm_kmalloc(dev); err |= test_devm_kzalloc(dev); device_unregister(dev); return err; } static int __init test_module_init(void) { int err = 0; err |= test_overflow_calculation(); err |= test_overflow_shift(); err |= test_overflow_allocation(); if (err) { pr_warn("FAIL!\n"); err = -EINVAL; } else { pr_info("all tests passed\n"); } return err; } static void __exit test_module_exit(void) { } module_init(test_module_init); module_exit(test_module_exit); MODULE_LICENSE("Dual MIT/GPL");