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memcpy_kunit.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Test cases for memcpy(), memmove(), and memset().
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <kunit/test.h>
#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>
struct some_bytes {
union {
u8 data[32];
struct {
u32 one;
u16 two;
u8 three;
/* 1 byte hole */
u32 four[4];
};
};
};
#define check(instance, v) do { \
BUILD_BUG_ON(sizeof(instance.data) != 32); \
for (size_t i = 0; i < sizeof(instance.data); i++) { \
KUNIT_ASSERT_EQ_MSG(test, instance.data[i], v, \
"line %d: '%s' not initialized to 0x%02x @ %d (saw 0x%02x)\n", \
__LINE__, #instance, v, i, instance.data[i]); \
} \
} while (0)
#define compare(name, one, two) do { \
BUILD_BUG_ON(sizeof(one) != sizeof(two)); \
for (size_t i = 0; i < sizeof(one); i++) { \
KUNIT_EXPECT_EQ_MSG(test, one.data[i], two.data[i], \
"line %d: %s.data[%d] (0x%02x) != %s.data[%d] (0x%02x)\n", \
__LINE__, #one, i, one.data[i], #two, i, two.data[i]); \
} \
kunit_info(test, "ok: " TEST_OP "() " name "\n"); \
} while (0)
static void memcpy_test(struct kunit *test)
{
#define TEST_OP "memcpy"
struct some_bytes control = {
.data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
},
};
struct some_bytes zero = { };
struct some_bytes middle = {
.data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
},
};
struct some_bytes three = {
.data = { 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
},
};
struct some_bytes dest = { };
int count;
u8 *ptr;
/* Verify static initializers. */
check(control, 0x20);
check(zero, 0);
compare("static initializers", dest, zero);
/* Verify assignment. */
dest = control;
compare("direct assignment", dest, control);
/* Verify complete overwrite. */
memcpy(dest.data, zero.data, sizeof(dest.data));
compare("complete overwrite", dest, zero);
/* Verify middle overwrite. */
dest = control;
memcpy(dest.data + 12, zero.data, 7);
compare("middle overwrite", dest, middle);
/* Verify argument side-effects aren't repeated. */
dest = control;
ptr = dest.data;
count = 1;
memcpy(ptr++, zero.data, count++);
ptr += 8;
memcpy(ptr++, zero.data, count++);
compare("argument side-effects", dest, three);
#undef TEST_OP
}
static void memmove_test(struct kunit *test)
{
#define TEST_OP "memmove"
struct some_bytes control = {
.data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
},
};
struct some_bytes zero = { };
struct some_bytes middle = {
.data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
},
};
struct some_bytes five = {
.data = { 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x00, 0x00, 0x00, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
},
};
struct some_bytes overlap = {
.data = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
},
};
struct some_bytes overlap_expected = {
.data = { 0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x04, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
},
};
struct some_bytes dest = { };
int count;
u8 *ptr;
/* Verify static initializers. */
check(control, 0x99);
check(zero, 0);
compare("static initializers", zero, dest);
/* Verify assignment. */
dest = control;
compare("direct assignment", dest, control);
/* Verify complete overwrite. */
memmove(dest.data, zero.data, sizeof(dest.data));
compare("complete overwrite", dest, zero);
/* Verify middle overwrite. */
dest = control;
memmove(dest.data + 12, zero.data, 7);
compare("middle overwrite", dest, middle);
/* Verify argument side-effects aren't repeated. */
dest = control;
ptr = dest.data;
count = 2;
memmove(ptr++, zero.data, count++);
ptr += 9;
memmove(ptr++, zero.data, count++);
compare("argument side-effects", dest, five);
/* Verify overlapping overwrite is correct. */
ptr = &overlap.data[2];
memmove(ptr, overlap.data, 5);
compare("overlapping write", overlap, overlap_expected);
#undef TEST_OP
}
static void memset_test(struct kunit *test)
{
#define TEST_OP "memset"
struct some_bytes control = {
.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
},
};
struct some_bytes complete = {
.data = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
},
};
struct some_bytes middle = {
.data = { 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
},
};
struct some_bytes three = {
.data = { 0x60, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x61, 0x61, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
},
};
struct some_bytes after = {
.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x72,
0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
},
};
struct some_bytes startat = {
.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
},
};
struct some_bytes dest = { };
int count, value;
u8 *ptr;
/* Verify static initializers. */
check(control, 0x30);
check(dest, 0);
/* Verify assignment. */
dest = control;
compare("direct assignment", dest, control);
/* Verify complete overwrite. */
memset(dest.data, 0xff, sizeof(dest.data));
compare("complete overwrite", dest, complete);
/* Verify middle overwrite. */
dest = control;
memset(dest.data + 4, 0x31, 16);
compare("middle overwrite", dest, middle);
/* Verify argument side-effects aren't repeated. */
dest = control;
ptr = dest.data;
value = 0x60;
count = 1;
memset(ptr++, value++, count++);
ptr += 8;
memset(ptr++, value++, count++);
compare("argument side-effects", dest, three);
/* Verify memset_after() */
dest = control;
memset_after(&dest, 0x72, three);
compare("memset_after()", dest, after);
/* Verify memset_startat() */
dest = control;
memset_startat(&dest, 0x79, four);
compare("memset_startat()", dest, startat);
#undef TEST_OP
}
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(memmove_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");