570 lines
17 KiB
C
570 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Test cases for memcpy(), memmove(), and memset().
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <kunit/test.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/overflow.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/vmalloc.h>
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struct some_bytes {
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union {
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u8 data[32];
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struct {
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u32 one;
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u16 two;
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u8 three;
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/* 1 byte hole */
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u32 four[4];
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};
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};
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};
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#define check(instance, v) do { \
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BUILD_BUG_ON(sizeof(instance.data) != 32); \
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for (size_t i = 0; i < sizeof(instance.data); i++) { \
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KUNIT_ASSERT_EQ_MSG(test, instance.data[i], v, \
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"line %d: '%s' not initialized to 0x%02x @ %zu (saw 0x%02x)\n", \
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__LINE__, #instance, v, i, instance.data[i]); \
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} \
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} while (0)
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#define compare(name, one, two) do { \
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BUILD_BUG_ON(sizeof(one) != sizeof(two)); \
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for (size_t i = 0; i < sizeof(one); i++) { \
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KUNIT_EXPECT_EQ_MSG(test, one.data[i], two.data[i], \
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"line %d: %s.data[%zu] (0x%02x) != %s.data[%zu] (0x%02x)\n", \
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__LINE__, #one, i, one.data[i], #two, i, two.data[i]); \
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} \
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kunit_info(test, "ok: " TEST_OP "() " name "\n"); \
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} while (0)
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static void memcpy_test(struct kunit *test)
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{
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#define TEST_OP "memcpy"
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struct some_bytes control = {
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.data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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},
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};
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struct some_bytes zero = { };
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struct some_bytes middle = {
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.data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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},
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};
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struct some_bytes three = {
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.data = { 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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},
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};
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struct some_bytes dest = { };
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int count;
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u8 *ptr;
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/* Verify static initializers. */
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check(control, 0x20);
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check(zero, 0);
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compare("static initializers", dest, zero);
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/* Verify assignment. */
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dest = control;
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compare("direct assignment", dest, control);
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/* Verify complete overwrite. */
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memcpy(dest.data, zero.data, sizeof(dest.data));
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compare("complete overwrite", dest, zero);
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/* Verify middle overwrite. */
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dest = control;
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memcpy(dest.data + 12, zero.data, 7);
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compare("middle overwrite", dest, middle);
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/* Verify argument side-effects aren't repeated. */
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dest = control;
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ptr = dest.data;
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count = 1;
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memcpy(ptr++, zero.data, count++);
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ptr += 8;
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memcpy(ptr++, zero.data, count++);
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compare("argument side-effects", dest, three);
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#undef TEST_OP
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}
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static unsigned char larger_array [2048];
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static void memmove_test(struct kunit *test)
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{
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#define TEST_OP "memmove"
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struct some_bytes control = {
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.data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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},
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};
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struct some_bytes zero = { };
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struct some_bytes middle = {
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.data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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},
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};
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struct some_bytes five = {
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.data = { 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x00, 0x00, 0x00, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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},
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};
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struct some_bytes overlap = {
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.data = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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},
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};
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struct some_bytes overlap_expected = {
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.data = { 0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x04, 0x07,
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
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},
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};
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struct some_bytes dest = { };
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int count;
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u8 *ptr;
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/* Verify static initializers. */
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check(control, 0x99);
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check(zero, 0);
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compare("static initializers", zero, dest);
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/* Verify assignment. */
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dest = control;
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compare("direct assignment", dest, control);
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/* Verify complete overwrite. */
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memmove(dest.data, zero.data, sizeof(dest.data));
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compare("complete overwrite", dest, zero);
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/* Verify middle overwrite. */
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dest = control;
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memmove(dest.data + 12, zero.data, 7);
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compare("middle overwrite", dest, middle);
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/* Verify argument side-effects aren't repeated. */
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dest = control;
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ptr = dest.data;
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count = 2;
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memmove(ptr++, zero.data, count++);
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ptr += 9;
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memmove(ptr++, zero.data, count++);
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compare("argument side-effects", dest, five);
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/* Verify overlapping overwrite is correct. */
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ptr = &overlap.data[2];
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memmove(ptr, overlap.data, 5);
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compare("overlapping write", overlap, overlap_expected);
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/* Verify larger overlapping moves. */
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larger_array[256] = 0xAAu;
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/*
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* Test a backwards overlapping memmove first. 256 and 1024 are
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* important for i386 to use rep movsl.
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*/
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memmove(larger_array, larger_array + 256, 1024);
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KUNIT_ASSERT_EQ(test, larger_array[0], 0xAAu);
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KUNIT_ASSERT_EQ(test, larger_array[256], 0x00);
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KUNIT_ASSERT_NULL(test,
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memchr(larger_array + 1, 0xaa, ARRAY_SIZE(larger_array) - 1));
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/* Test a forwards overlapping memmove. */
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larger_array[0] = 0xBBu;
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memmove(larger_array + 256, larger_array, 1024);
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KUNIT_ASSERT_EQ(test, larger_array[0], 0xBBu);
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KUNIT_ASSERT_EQ(test, larger_array[256], 0xBBu);
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KUNIT_ASSERT_NULL(test, memchr(larger_array + 1, 0xBBu, 256 - 1));
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KUNIT_ASSERT_NULL(test,
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memchr(larger_array + 257, 0xBBu, ARRAY_SIZE(larger_array) - 257));
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#undef TEST_OP
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}
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static void memset_test(struct kunit *test)
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{
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#define TEST_OP "memset"
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struct some_bytes control = {
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.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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},
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};
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struct some_bytes complete = {
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.data = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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},
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};
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struct some_bytes middle = {
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.data = { 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x31,
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0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
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0x31, 0x31, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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},
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};
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struct some_bytes three = {
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.data = { 0x60, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x61, 0x61, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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},
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};
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struct some_bytes after = {
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.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x72,
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0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
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0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
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0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
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},
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};
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struct some_bytes startat = {
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.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
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0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
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0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
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0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
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},
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};
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struct some_bytes dest = { };
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int count, value;
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u8 *ptr;
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/* Verify static initializers. */
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check(control, 0x30);
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check(dest, 0);
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/* Verify assignment. */
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dest = control;
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compare("direct assignment", dest, control);
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/* Verify complete overwrite. */
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memset(dest.data, 0xff, sizeof(dest.data));
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compare("complete overwrite", dest, complete);
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/* Verify middle overwrite. */
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dest = control;
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memset(dest.data + 4, 0x31, 16);
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compare("middle overwrite", dest, middle);
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/* Verify argument side-effects aren't repeated. */
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dest = control;
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ptr = dest.data;
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value = 0x60;
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count = 1;
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memset(ptr++, value++, count++);
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ptr += 8;
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memset(ptr++, value++, count++);
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compare("argument side-effects", dest, three);
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/* Verify memset_after() */
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dest = control;
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memset_after(&dest, 0x72, three);
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compare("memset_after()", dest, after);
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/* Verify memset_startat() */
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dest = control;
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memset_startat(&dest, 0x79, four);
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compare("memset_startat()", dest, startat);
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#undef TEST_OP
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}
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static u8 large_src[1024];
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static u8 large_dst[2048];
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static const u8 large_zero[2048];
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static void set_random_nonzero(struct kunit *test, u8 *byte)
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{
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int failed_rng = 0;
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while (*byte == 0) {
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get_random_bytes(byte, 1);
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KUNIT_ASSERT_LT_MSG(test, failed_rng++, 100,
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"Is the RNG broken?");
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}
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}
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static void init_large(struct kunit *test)
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{
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if (!IS_ENABLED(CONFIG_MEMCPY_SLOW_KUNIT_TEST))
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kunit_skip(test, "Slow test skipped. Enable with CONFIG_MEMCPY_SLOW_KUNIT_TEST=y");
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/* Get many bit patterns. */
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get_random_bytes(large_src, ARRAY_SIZE(large_src));
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/* Make sure we have non-zero edges. */
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set_random_nonzero(test, &large_src[0]);
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set_random_nonzero(test, &large_src[ARRAY_SIZE(large_src) - 1]);
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/* Explicitly zero the entire destination. */
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memset(large_dst, 0, ARRAY_SIZE(large_dst));
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}
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/*
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* Instead of an indirect function call for "copy" or a giant macro,
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* use a bool to pick memcpy or memmove.
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*/
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static void copy_large_test(struct kunit *test, bool use_memmove)
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{
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init_large(test);
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/* Copy a growing number of non-overlapping bytes ... */
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for (int bytes = 1; bytes <= ARRAY_SIZE(large_src); bytes++) {
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/* Over a shifting destination window ... */
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for (int offset = 0; offset < ARRAY_SIZE(large_src); offset++) {
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int right_zero_pos = offset + bytes;
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int right_zero_size = ARRAY_SIZE(large_dst) - right_zero_pos;
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/* Copy! */
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if (use_memmove)
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memmove(large_dst + offset, large_src, bytes);
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else
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memcpy(large_dst + offset, large_src, bytes);
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/* Did we touch anything before the copy area? */
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KUNIT_ASSERT_EQ_MSG(test,
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memcmp(large_dst, large_zero, offset), 0,
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"with size %d at offset %d", bytes, offset);
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/* Did we touch anything after the copy area? */
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KUNIT_ASSERT_EQ_MSG(test,
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memcmp(&large_dst[right_zero_pos], large_zero, right_zero_size), 0,
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"with size %d at offset %d", bytes, offset);
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/* Are we byte-for-byte exact across the copy? */
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KUNIT_ASSERT_EQ_MSG(test,
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memcmp(large_dst + offset, large_src, bytes), 0,
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"with size %d at offset %d", bytes, offset);
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/* Zero out what we copied for the next cycle. */
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memset(large_dst + offset, 0, bytes);
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}
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/* Avoid stall warnings if this loop gets slow. */
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cond_resched();
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}
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}
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static void memcpy_large_test(struct kunit *test)
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{
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copy_large_test(test, false);
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}
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static void memmove_large_test(struct kunit *test)
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{
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copy_large_test(test, true);
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}
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/*
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* On the assumption that boundary conditions are going to be the most
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* sensitive, instead of taking a full step (inc) each iteration,
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* take single index steps for at least the first "inc"-many indexes
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* from the "start" and at least the last "inc"-many indexes before
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* the "end". When in the middle, take full "inc"-wide steps. For
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* example, calling next_step(idx, 1, 15, 3) with idx starting at 0
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* would see the following pattern: 1 2 3 4 7 10 11 12 13 14 15.
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*/
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static int next_step(int idx, int start, int end, int inc)
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{
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start += inc;
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end -= inc;
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if (idx < start || idx + inc > end)
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inc = 1;
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return idx + inc;
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}
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static void inner_loop(struct kunit *test, int bytes, int d_off, int s_off)
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{
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int left_zero_pos, left_zero_size;
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int right_zero_pos, right_zero_size;
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int src_pos, src_orig_pos, src_size;
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int pos;
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/* Place the source in the destination buffer. */
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memcpy(&large_dst[s_off], large_src, bytes);
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/* Copy to destination offset. */
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memmove(&large_dst[d_off], &large_dst[s_off], bytes);
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/* Make sure destination entirely matches. */
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KUNIT_ASSERT_EQ_MSG(test, memcmp(&large_dst[d_off], large_src, bytes), 0,
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"with size %d at src offset %d and dest offset %d",
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bytes, s_off, d_off);
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/* Calculate the expected zero spans. */
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if (s_off < d_off) {
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left_zero_pos = 0;
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left_zero_size = s_off;
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right_zero_pos = d_off + bytes;
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right_zero_size = ARRAY_SIZE(large_dst) - right_zero_pos;
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src_pos = s_off;
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src_orig_pos = 0;
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src_size = d_off - s_off;
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} else {
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left_zero_pos = 0;
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left_zero_size = d_off;
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right_zero_pos = s_off + bytes;
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right_zero_size = ARRAY_SIZE(large_dst) - right_zero_pos;
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src_pos = d_off + bytes;
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src_orig_pos = src_pos - s_off;
|
|
src_size = right_zero_pos - src_pos;
|
|
}
|
|
|
|
/* Check non-overlapping source is unchanged.*/
|
|
KUNIT_ASSERT_EQ_MSG(test,
|
|
memcmp(&large_dst[src_pos], &large_src[src_orig_pos], src_size), 0,
|
|
"with size %d at src offset %d and dest offset %d",
|
|
bytes, s_off, d_off);
|
|
|
|
/* Check leading buffer contents are zero. */
|
|
KUNIT_ASSERT_EQ_MSG(test,
|
|
memcmp(&large_dst[left_zero_pos], large_zero, left_zero_size), 0,
|
|
"with size %d at src offset %d and dest offset %d",
|
|
bytes, s_off, d_off);
|
|
/* Check trailing buffer contents are zero. */
|
|
KUNIT_ASSERT_EQ_MSG(test,
|
|
memcmp(&large_dst[right_zero_pos], large_zero, right_zero_size), 0,
|
|
"with size %d at src offset %d and dest offset %d",
|
|
bytes, s_off, d_off);
|
|
|
|
/* Zero out everything not already zeroed.*/
|
|
pos = left_zero_pos + left_zero_size;
|
|
memset(&large_dst[pos], 0, right_zero_pos - pos);
|
|
}
|
|
|
|
static void memmove_overlap_test(struct kunit *test)
|
|
{
|
|
/*
|
|
* Running all possible offset and overlap combinations takes a
|
|
* very long time. Instead, only check up to 128 bytes offset
|
|
* into the destination buffer (which should result in crossing
|
|
* cachelines), with a step size of 1 through 7 to try to skip some
|
|
* redundancy.
|
|
*/
|
|
static const int offset_max = 128; /* less than ARRAY_SIZE(large_src); */
|
|
static const int bytes_step = 7;
|
|
static const int window_step = 7;
|
|
|
|
static const int bytes_start = 1;
|
|
static const int bytes_end = ARRAY_SIZE(large_src) + 1;
|
|
|
|
init_large(test);
|
|
|
|
/* Copy a growing number of overlapping bytes ... */
|
|
for (int bytes = bytes_start; bytes < bytes_end;
|
|
bytes = next_step(bytes, bytes_start, bytes_end, bytes_step)) {
|
|
|
|
/* Over a shifting destination window ... */
|
|
for (int d_off = 0; d_off < offset_max; d_off++) {
|
|
int s_start = max(d_off - bytes, 0);
|
|
int s_end = min_t(int, d_off + bytes, ARRAY_SIZE(large_src));
|
|
|
|
/* Over a shifting source window ... */
|
|
for (int s_off = s_start; s_off < s_end;
|
|
s_off = next_step(s_off, s_start, s_end, window_step))
|
|
inner_loop(test, bytes, d_off, s_off);
|
|
|
|
/* Avoid stall warnings. */
|
|
cond_resched();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void strtomem_test(struct kunit *test)
|
|
{
|
|
static const char input[sizeof(unsigned long)] = "hi";
|
|
static const char truncate[] = "this is too long";
|
|
struct {
|
|
unsigned long canary1;
|
|
unsigned char output[sizeof(unsigned long)] __nonstring;
|
|
unsigned long canary2;
|
|
} wrap;
|
|
|
|
memset(&wrap, 0xFF, sizeof(wrap));
|
|
KUNIT_EXPECT_EQ_MSG(test, wrap.canary1, ULONG_MAX,
|
|
"bad initial canary value");
|
|
KUNIT_EXPECT_EQ_MSG(test, wrap.canary2, ULONG_MAX,
|
|
"bad initial canary value");
|
|
|
|
/* Check unpadded copy leaves surroundings untouched. */
|
|
strtomem(wrap.output, input);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
|
|
KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
|
|
KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
|
|
for (size_t i = 2; i < sizeof(wrap.output); i++)
|
|
KUNIT_EXPECT_EQ(test, wrap.output[i], 0xFF);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
|
|
|
|
/* Check truncated copy leaves surroundings untouched. */
|
|
memset(&wrap, 0xFF, sizeof(wrap));
|
|
strtomem(wrap.output, truncate);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
|
|
for (size_t i = 0; i < sizeof(wrap.output); i++)
|
|
KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
|
|
|
|
/* Check padded copy leaves only string padded. */
|
|
memset(&wrap, 0xFF, sizeof(wrap));
|
|
strtomem_pad(wrap.output, input, 0xAA);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
|
|
KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
|
|
KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
|
|
for (size_t i = 2; i < sizeof(wrap.output); i++)
|
|
KUNIT_EXPECT_EQ(test, wrap.output[i], 0xAA);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
|
|
|
|
/* Check truncated padded copy has no padding. */
|
|
memset(&wrap, 0xFF, sizeof(wrap));
|
|
strtomem(wrap.output, truncate);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
|
|
for (size_t i = 0; i < sizeof(wrap.output); i++)
|
|
KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
|
|
KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
|
|
}
|
|
|
|
static struct kunit_case memcpy_test_cases[] = {
|
|
KUNIT_CASE(memset_test),
|
|
KUNIT_CASE(memcpy_test),
|
|
KUNIT_CASE_SLOW(memcpy_large_test),
|
|
KUNIT_CASE_SLOW(memmove_test),
|
|
KUNIT_CASE_SLOW(memmove_large_test),
|
|
KUNIT_CASE_SLOW(memmove_overlap_test),
|
|
KUNIT_CASE(strtomem_test),
|
|
{}
|
|
};
|
|
|
|
static struct kunit_suite memcpy_test_suite = {
|
|
.name = "memcpy",
|
|
.test_cases = memcpy_test_cases,
|
|
};
|
|
|
|
kunit_test_suite(memcpy_test_suite);
|
|
|
|
MODULE_LICENSE("GPL");
|