From 617f55e20743fc50c989b498f9dee289eb644cfd Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 16 Feb 2022 14:17:49 -0800 Subject: lib: overflow: Convert to Kunit Convert overflow unit tests to KUnit, for better integration into the kernel self test framework. Includes a rename of test_overflow.c to overflow_kunit.c, and CONFIG_TEST_OVERFLOW to CONFIG_OVERFLOW_KUNIT_TEST. $ ./tools/testing/kunit/kunit.py run overflow ... [14:33:51] Starting KUnit Kernel (1/1)... [14:33:51] ============================================================ [14:33:51] ================== overflow (11 subtests) ================== [14:33:51] [PASSED] u8_overflow_test [14:33:51] [PASSED] s8_overflow_test [14:33:51] [PASSED] u16_overflow_test [14:33:51] [PASSED] s16_overflow_test [14:33:51] [PASSED] u32_overflow_test [14:33:51] [PASSED] s32_overflow_test [14:33:51] [PASSED] u64_overflow_test [14:33:51] [PASSED] s64_overflow_test [14:33:51] [PASSED] overflow_shift_test [14:33:51] [PASSED] overflow_allocation_test [14:33:51] [PASSED] overflow_size_helpers_test [14:33:51] ==================== [PASSED] overflow ===================== [14:33:51] ============================================================ [14:33:51] Testing complete. Passed: 11, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0 [14:33:51] Elapsed time: 12.525s total, 0.001s configuring, 12.402s building, 0.101s running Cc: Rasmus Villemoes Cc: Nick Desaulniers Co-developed-by: Vitor Massaru Iha Signed-off-by: Vitor Massaru Iha Link: https://lore.kernel.org/lkml/20200720224418.200495-1-vitor@massaru.org/ Co-developed-by: Daniel Latypov Signed-off-by: Daniel Latypov Link: https://lore.kernel.org/linux-kselftest/20210503211536.1384578-1-dlatypov@google.com/ Acked-by: Nick Desaulniers Link: https://lore.kernel.org/lkml/CAKwvOdm62iA1dNiC6Q11UJ-MnTqtc4kXkm-ubPaFMK824_k0nw@mail.gmail.com Signed-off-by: Kees Cook Reviewed-by: David Gow Link: https://lore.kernel.org/lkml/CABVgOS=TWVh649_Vjo3wnMu9gZnq66gkV-LtGgsksAWMqc+MSA@mail.gmail.com --- lib/Kconfig.debug | 16 +- lib/Makefile | 2 +- lib/overflow_kunit.c | 670 +++++++++++++++++++++++++++++++++++++++++++++++ lib/test_overflow.c | 726 --------------------------------------------------- 4 files changed, 684 insertions(+), 730 deletions(-) create mode 100644 lib/overflow_kunit.c delete mode 100644 lib/test_overflow.c (limited to 'lib') diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 14b89aa37c5c..14d90d03bc8d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2214,9 +2214,6 @@ config TEST_UUID config TEST_XARRAY tristate "Test the XArray code at runtime" -config TEST_OVERFLOW - tristate "Test check_*_overflow() functions at runtime" - config TEST_RHASHTABLE tristate "Perform selftest on resizable hash table" help @@ -2501,6 +2498,19 @@ config MEMCPY_KUNIT_TEST If unsure, say N. +config OVERFLOW_KUNIT_TEST + tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + Builds unit tests for the check_*_overflow(), size_*(), allocation, and + related functions. + + For more information on KUnit and unit tests in general please refer + to the KUnit documentation in Documentation/dev-tools/kunit/. + + If unsure, say N. + config TEST_UDELAY tristate "udelay test driver" help diff --git a/lib/Makefile b/lib/Makefile index 300f569c626b..fdfcbfaff32f 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -77,7 +77,6 @@ obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o obj-$(CONFIG_TEST_MIN_HEAP) += test_min_heap.o obj-$(CONFIG_TEST_LKM) += test_module.o obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o -obj-$(CONFIG_TEST_OVERFLOW) += test_overflow.o obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o obj-$(CONFIG_TEST_SORT) += test_sort.o obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o @@ -363,6 +362,7 @@ obj-$(CONFIG_BITS_TEST) += test_bits.o obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o +obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o diff --git a/lib/overflow_kunit.c b/lib/overflow_kunit.c new file mode 100644 index 000000000000..475f0c064bf6 --- /dev/null +++ b/lib/overflow_kunit.c @@ -0,0 +1,670 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Test cases for arithmetic overflow checks. See: + * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests + * ./tools/testing/kunit/kunit.py run overflow [--raw_output] + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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[] + +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); \ + KUNIT_EXPECT_EQ_MSG(test, _of, of, \ + "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \ + a, b, of ? "" : " not", #t); \ + KUNIT_EXPECT_EQ_MSG(test, _r, r, \ + "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 do_test_ ## t(struct kunit *test, 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 t ## _overflow_test(struct kunit *test) { \ + unsigned i; \ + \ + for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ + do_test_ ## t(test, &t ## _tests[i]); \ + kunit_info(test, "%zu %s arithmetic tests finished\n", \ + ARRAY_SIZE(t ## _tests), #t); \ +} + +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 void overflow_shift_test(struct kunit *test) +{ + int count = 0; + +/* 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) + + /* 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); + + /* 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); + /* 01000010000001000100010001001011 */ + TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); + TEST_ONE_SHIFT(1107575883, 1, int, 0, true); + /* 0100000100001000001000000010000001000010000001000100010001001011 */ + TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); + + /* Overflow: bit shifted past signed bit on signed types. */ + /* 01001011 */ + TEST_ONE_SHIFT(75, 2, s8, 0, true); + /* 0100010001001011 */ + TEST_ONE_SHIFT(17483, 2, s16, 0, true); + /* 01000010000001000100010001001011 */ + TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); + TEST_ONE_SHIFT(1107575883, 2, int, 0, true); + /* 0100000100001000001000000010000001000010000001000100010001001011 */ + TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); + + /* Overflow: values larger than destination type. */ + TEST_ONE_SHIFT(0x100, 0, u8, 0, true); + TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); + TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); + TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); + TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); + TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); + TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); + + /* Nonsense: negative initial value. */ + TEST_ONE_SHIFT(-1, 0, s8, 0, true); + TEST_ONE_SHIFT(-1, 0, u8, 0, true); + TEST_ONE_SHIFT(-5, 0, s16, 0, true); + TEST_ONE_SHIFT(-5, 0, u16, 0, true); + TEST_ONE_SHIFT(-10, 0, int, 0, true); + TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); + TEST_ONE_SHIFT(-100, 0, s32, 0, true); + TEST_ONE_SHIFT(-100, 0, u32, 0, true); + TEST_ONE_SHIFT(-10000, 0, s64, 0, true); + TEST_ONE_SHIFT(-10000, 0, u64, 0, true); + + /* Nonsense: negative shift values. */ + TEST_ONE_SHIFT(0, -5, s8, 0, true); + TEST_ONE_SHIFT(0, -5, u8, 0, true); + TEST_ONE_SHIFT(0, -10, s16, 0, true); + TEST_ONE_SHIFT(0, -10, u16, 0, true); + TEST_ONE_SHIFT(0, -15, int, 0, true); + TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); + TEST_ONE_SHIFT(0, -20, s32, 0, true); + TEST_ONE_SHIFT(0, -20, u32, 0, true); + TEST_ONE_SHIFT(0, -30, s64, 0, true); + TEST_ONE_SHIFT(0, -30, u64, 0, true); + + /* Overflow: shifted at or beyond entire type's bit width. */ + TEST_ONE_SHIFT(0, 8, u8, 0, true); + TEST_ONE_SHIFT(0, 9, u8, 0, true); + TEST_ONE_SHIFT(0, 8, s8, 0, true); + TEST_ONE_SHIFT(0, 9, s8, 0, true); + TEST_ONE_SHIFT(0, 16, u16, 0, true); + TEST_ONE_SHIFT(0, 17, u16, 0, true); + TEST_ONE_SHIFT(0, 16, s16, 0, true); + TEST_ONE_SHIFT(0, 17, s16, 0, true); + TEST_ONE_SHIFT(0, 32, u32, 0, true); + TEST_ONE_SHIFT(0, 33, u32, 0, true); + TEST_ONE_SHIFT(0, 32, int, 0, true); + TEST_ONE_SHIFT(0, 33, int, 0, true); + TEST_ONE_SHIFT(0, 32, s32, 0, true); + TEST_ONE_SHIFT(0, 33, s32, 0, true); + TEST_ONE_SHIFT(0, 64, u64, 0, true); + TEST_ONE_SHIFT(0, 65, u64, 0, true); + TEST_ONE_SHIFT(0, 64, s64, 0, true); + 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. + */ + TEST_ONE_SHIFT(0, 7, s8, 0, false); + TEST_ONE_SHIFT(0, 15, s16, 0, false); + TEST_ONE_SHIFT(0, 31, int, 0, false); + TEST_ONE_SHIFT(0, 31, s32, 0, false); + TEST_ONE_SHIFT(0, 63, s64, 0, false); + + kunit_info(test, "%d shift tests finished\n", count); +#undef TEST_ONE_SHIFT +} + +/* + * Deal with the various forms of allocator arguments. See comments above + * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". + */ +#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) +#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) +#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, 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, alloc_GFP) +#define free0(free, arg, ptr) free(ptr) +#define free1(free, arg, ptr) free(arg, ptr) + +/* Wrap around to 16K */ +#define TEST_SIZE (5 * 4096) + +#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ +static void test_ ## func (struct kunit *test, 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);\ + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ + #func " failed regular allocation?!\n"); \ + free ## want_arg (free_func, arg, ptr); \ + \ + /* Wrapped allocation test. */ \ + ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ + a * b); \ + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ + #func " unexpectedly failed bad wrapping?!\n"); \ + 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) { \ + KUNIT_FAIL(test, #func " missed saturation!\n"); \ + free ## want_arg (free_func, arg, ptr); \ + } \ +} + +/* + * 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, 1, 0); +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 void overflow_allocation_test(struct kunit *test) +{ + const char device_name[] = "overflow-test"; + struct device *dev; + int count = 0; + +#define check_allocation_overflow(alloc) do { \ + count++; \ + test_ ## alloc(test, dev); \ +} while (0) + + /* Create dummy device for devm_kmalloc()-family tests. */ + dev = root_device_register(device_name); + KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), + "Cannot register test device\n"); + + check_allocation_overflow(kmalloc); + check_allocation_overflow(kmalloc_node); + check_allocation_overflow(kzalloc); + check_allocation_overflow(kzalloc_node); + check_allocation_overflow(__vmalloc); + check_allocation_overflow(kvmalloc); + check_allocation_overflow(kvmalloc_node); + check_allocation_overflow(kvzalloc); + check_allocation_overflow(kvzalloc_node); + check_allocation_overflow(devm_kmalloc); + check_allocation_overflow(devm_kzalloc); + + device_unregister(dev); + + kunit_info(test, "%d allocation overflow tests finished\n", count); +#undef check_allocation_overflow +} + +struct __test_flex_array { + unsigned long flags; + size_t count; + unsigned long data[]; +}; + +static void overflow_size_helpers_test(struct kunit *test) +{ + /* Make sure struct_size() can be used in a constant expression. */ + u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)]; + struct __test_flex_array *obj; + int count = 0; + int var; + volatile int unconst = 0; + + /* Verify constant expression against runtime version. */ + var = 55; + OPTIMIZER_HIDE_VAR(var); + KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var)); + +#define check_one_size_helper(expected, func, args...) do { \ + size_t _r = func(args); \ + KUNIT_EXPECT_EQ_MSG(test, _r, expected, \ + "expected " #func "(" #args ") to return %zu but got %zu instead\n", \ + (size_t)(expected), _r); \ + count++; \ +} while (0) + + var = 4; + check_one_size_helper(20, size_mul, var++, 5); + check_one_size_helper(20, size_mul, 4, var++); + check_one_size_helper(0, size_mul, 0, 3); + check_one_size_helper(0, size_mul, 3, 0); + check_one_size_helper(6, size_mul, 2, 3); + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1); + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3); + check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3); + + var = 4; + check_one_size_helper(9, size_add, var++, 5); + check_one_size_helper(9, size_add, 4, var++); + check_one_size_helper(9, size_add, 9, 0); + check_one_size_helper(9, size_add, 0, 9); + check_one_size_helper(5, size_add, 2, 3); + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1); + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3); + check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3); + + var = 4; + check_one_size_helper(1, size_sub, var--, 3); + check_one_size_helper(1, size_sub, 4, var--); + check_one_size_helper(1, size_sub, 3, 2); + check_one_size_helper(9, size_sub, 9, 0); + check_one_size_helper(SIZE_MAX, size_sub, 9, -3); + check_one_size_helper(SIZE_MAX, size_sub, 0, 9); + check_one_size_helper(SIZE_MAX, size_sub, 2, 3); + check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0); + check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10); + check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX); + check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX); + check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1); + check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3); + check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3); + + var = 4; + check_one_size_helper(4 * sizeof(*obj->data), + flex_array_size, obj, data, var++); + check_one_size_helper(5 * sizeof(*obj->data), + flex_array_size, obj, data, var++); + check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst); + check_one_size_helper(sizeof(*obj->data), + flex_array_size, obj, data, 1 + unconst); + check_one_size_helper(7 * sizeof(*obj->data), + flex_array_size, obj, data, 7 + unconst); + check_one_size_helper(SIZE_MAX, + flex_array_size, obj, data, -1 + unconst); + check_one_size_helper(SIZE_MAX, + flex_array_size, obj, data, SIZE_MAX - 4 + unconst); + + var = 4; + check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)), + struct_size, obj, data, var++); + check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)), + struct_size, obj, data, var++); + check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst); + check_one_size_helper(sizeof(*obj) + sizeof(*obj->data), + struct_size, obj, data, 1 + unconst); + check_one_size_helper(SIZE_MAX, + struct_size, obj, data, -3 + unconst); + check_one_size_helper(SIZE_MAX, + struct_size, obj, data, SIZE_MAX - 3 + unconst); + + kunit_info(test, "%d overflow size helper tests finished\n", count); +#undef check_one_size_helper +} + +static struct kunit_case overflow_test_cases[] = { + KUNIT_CASE(u8_overflow_test), + KUNIT_CASE(s8_overflow_test), + KUNIT_CASE(u16_overflow_test), + KUNIT_CASE(s16_overflow_test), + KUNIT_CASE(u32_overflow_test), + KUNIT_CASE(s32_overflow_test), +#if BITS_PER_LONG == 64 + KUNIT_CASE(u64_overflow_test), + KUNIT_CASE(s64_overflow_test), +#endif + KUNIT_CASE(overflow_shift_test), + KUNIT_CASE(overflow_allocation_test), + KUNIT_CASE(overflow_size_helpers_test), + {} +}; + +static struct kunit_suite overflow_test_suite = { + .name = "overflow", + .test_cases = overflow_test_cases, +}; + +kunit_test_suite(overflow_test_suite); + +MODULE_LICENSE("Dual MIT/GPL"); diff --git a/lib/test_overflow.c b/lib/test_overflow.c deleted file mode 100644 index f6530fce799d..000000000000 --- a/lib/test_overflow.c +++ /dev/null @@ -1,726 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 OR MIT -/* - * Test cases for arithmetic overflow checks. - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#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; \ - \ - for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ - err |= do_test_ ## t(&t ## _tests[i]); \ - pr_info("%zu %s arithmetic tests finished\n", \ - ARRAY_SIZE(t ## _tests), #t); \ - 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; - int count = 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; \ - } \ - count++; \ - __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); - - pr_info("%d shift tests finished\n", count); - -#undef TEST_ONE_SHIFT - - return err; -} - -/* - * Deal with the various forms of allocator arguments. See comments above - * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". - */ -#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) -#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) -#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, 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, alloc_GFP) -#define free0(free, arg, ptr) free(ptr) -#define free1(free, arg, ptr) free(arg, ptr) - -/* Wrap around to 16K */ -#define TEST_SIZE (5 * 4096) - -#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; \ - } \ - 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, 1, 0); -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 count = 0; - int err = 0; - -#define check_allocation_overflow(alloc) ({ \ - count++; \ - test_ ## alloc(dev); \ -}) - - /* 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 |= check_allocation_overflow(kmalloc); - err |= check_allocation_overflow(kmalloc_node); - err |= check_allocation_overflow(kzalloc); - err |= check_allocation_overflow(kzalloc_node); - err |= check_allocation_overflow(__vmalloc); - err |= check_allocation_overflow(kvmalloc); - err |= check_allocation_overflow(kvmalloc_node); - err |= check_allocation_overflow(kvzalloc); - err |= check_allocation_overflow(kvzalloc_node); - err |= check_allocation_overflow(devm_kmalloc); - err |= check_allocation_overflow(devm_kzalloc); - - device_unregister(dev); - - pr_info("%d allocation overflow tests finished\n", count); - -#undef check_allocation_overflow - - return err; -} - -struct __test_flex_array { - unsigned long flags; - size_t count; - unsigned long data[]; -}; - -static int __init test_overflow_size_helpers(void) -{ - /* Make sure struct_size() can be used in a constant expression. */ - u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)]; - struct __test_flex_array *obj; - int count = 0; - int err = 0; - int var; - volatile int unconst = 0; - - /* Verify constant expression against runtime version. */ - var = 55; - OPTIMIZER_HIDE_VAR(var); - err |= sizeof(ce_array) != struct_size(obj, data, var); - -#define check_one_size_helper(expected, func, args...) ({ \ - bool __failure = false; \ - size_t _r; \ - \ - _r = func(args); \ - if (_r != (expected)) { \ - pr_warn("expected " #func "(" #args ") " \ - "to return %zu but got %zu instead\n", \ - (size_t)(expected), _r); \ - __failure = true; \ - } \ - count++; \ - __failure; \ -}) - - var = 4; - err |= check_one_size_helper(20, size_mul, var++, 5); - err |= check_one_size_helper(20, size_mul, 4, var++); - err |= check_one_size_helper(0, size_mul, 0, 3); - err |= check_one_size_helper(0, size_mul, 3, 0); - err |= check_one_size_helper(6, size_mul, 2, 3); - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1); - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3); - err |= check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3); - - var = 4; - err |= check_one_size_helper(9, size_add, var++, 5); - err |= check_one_size_helper(9, size_add, 4, var++); - err |= check_one_size_helper(9, size_add, 9, 0); - err |= check_one_size_helper(9, size_add, 0, 9); - err |= check_one_size_helper(5, size_add, 2, 3); - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1); - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3); - err |= check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3); - - var = 4; - err |= check_one_size_helper(1, size_sub, var--, 3); - err |= check_one_size_helper(1, size_sub, 4, var--); - err |= check_one_size_helper(1, size_sub, 3, 2); - err |= check_one_size_helper(9, size_sub, 9, 0); - err |= check_one_size_helper(SIZE_MAX, size_sub, 9, -3); - err |= check_one_size_helper(SIZE_MAX, size_sub, 0, 9); - err |= check_one_size_helper(SIZE_MAX, size_sub, 2, 3); - err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0); - err |= check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10); - err |= check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX); - err |= check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX); - err |= check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1); - err |= check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3); - err |= check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3); - - var = 4; - err |= check_one_size_helper(4 * sizeof(*obj->data), - flex_array_size, obj, data, var++); - err |= check_one_size_helper(5 * sizeof(*obj->data), - flex_array_size, obj, data, var++); - err |= check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst); - err |= check_one_size_helper(sizeof(*obj->data), - flex_array_size, obj, data, 1 + unconst); - err |= check_one_size_helper(7 * sizeof(*obj->data), - flex_array_size, obj, data, 7 + unconst); - err |= check_one_size_helper(SIZE_MAX, - flex_array_size, obj, data, -1 + unconst); - err |= check_one_size_helper(SIZE_MAX, - flex_array_size, obj, data, SIZE_MAX - 4 + unconst); - - var = 4; - err |= check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)), - struct_size, obj, data, var++); - err |= check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)), - struct_size, obj, data, var++); - err |= check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst); - err |= check_one_size_helper(sizeof(*obj) + sizeof(*obj->data), - struct_size, obj, data, 1 + unconst); - err |= check_one_size_helper(SIZE_MAX, - struct_size, obj, data, -3 + unconst); - err |= check_one_size_helper(SIZE_MAX, - struct_size, obj, data, SIZE_MAX - 3 + unconst); - - pr_info("%d overflow size helper tests finished\n", count); - - return err; -} - -static int __init test_module_init(void) -{ - int err = 0; - - err |= test_overflow_calculation(); - err |= test_overflow_shift(); - err |= test_overflow_size_helpers(); - 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"); -- cgit v1.2.3