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
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
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-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
obj-$(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
--- /dev/null
+// 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 <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 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");
+++ /dev/null
-// 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; \
- \
- 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");
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