mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 06:04:23 +08:00
lib: Introduce CONFIG_MEMCPY_KUNIT_TEST
Before changing anything about memcpy(), memmove(), and memset(), add run-time tests to check basic behaviors for any regressions. Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook
parent
be58f71037
commit
bb95ebbe89
@ -2452,6 +2452,17 @@ config RATIONAL_KUNIT_TEST
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
config MEMCPY_KUNIT_TEST
|
||||
tristate "Test memcpy(), memmove(), and memset() functions at runtime" if !KUNIT_ALL_TESTS
|
||||
depends on KUNIT
|
||||
default KUNIT_ALL_TESTS
|
||||
help
|
||||
Builds unit tests for memcpy(), memmove(), and memset() 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
|
||||
|
||||
@ -358,6 +358,7 @@ obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
|
||||
obj-$(CONFIG_BITS_TEST) += test_bits.o
|
||||
obj-$(CONFIG_CMDLINE_KUNIT_TEST) += cmdline_kunit.o
|
||||
obj-$(CONFIG_SLUB_KUNIT_TEST) += slub_kunit.o
|
||||
obj-$(CONFIG_MEMCPY_KUNIT_TEST) += memcpy_kunit.o
|
||||
|
||||
obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
|
||||
|
||||
|
||||
265
lib/memcpy_kunit.c
Normal file
265
lib/memcpy_kunit.c
Normal file
@ -0,0 +1,265 @@
|
||||
// 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 { \
|
||||
int i; \
|
||||
BUILD_BUG_ON(sizeof(instance.data) != 32); \
|
||||
for (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 { \
|
||||
int i; \
|
||||
BUILD_BUG_ON(sizeof(one) != sizeof(two)); \
|
||||
for (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 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);
|
||||
#undef TEST_OP
|
||||
}
|
||||
|
||||
static struct kunit_case memcpy_test_cases[] = {
|
||||
KUNIT_CASE(memset_test),
|
||||
KUNIT_CASE(memcpy_test),
|
||||
KUNIT_CASE(memmove_test),
|
||||
{}
|
||||
};
|
||||
|
||||
static struct kunit_suite memcpy_test_suite = {
|
||||
.name = "memcpy",
|
||||
.test_cases = memcpy_test_cases,
|
||||
};
|
||||
|
||||
kunit_test_suite(memcpy_test_suite);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user