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string: Convert strscpy() self-test to KUnit

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Convert the strscpy() self-test to a KUnit test.

Cc: David Gow <davidgow@google.com>
Cc: Tobin C. Harding <tobin@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/lkml/Y072ZMk/hNkfwqMv@dev-arch.thelio-3990X
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook
2022-10-02 09:51:46 -07:00
parent 9e4a617757
commit 41eefc46a3
5 changed files with 136 additions and 154 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@@ -8045,6 +8045,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/har
F: include/linux/fortify-string.h F: include/linux/fortify-string.h
F: lib/fortify_kunit.c F: lib/fortify_kunit.c
F: lib/memcpy_kunit.c F: lib/memcpy_kunit.c
F: lib/strscpy_kunit.c
F: lib/test_fortify/* F: lib/test_fortify/*
F: scripts/test_fortify.sh F: scripts/test_fortify.sh
K: \b__NO_FORTIFY\b K: \b__NO_FORTIFY\b

8
lib/Kconfig.debug
View File

@@ -2215,9 +2215,6 @@ config STRING_SELFTEST
config TEST_STRING_HELPERS config TEST_STRING_HELPERS
tristate "Test functions located in the string_helpers module at runtime" tristate "Test functions located in the string_helpers module at runtime"
config TEST_STRSCPY
tristate "Test strscpy*() family of functions at runtime"
config TEST_KSTRTOX config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime" tristate "Test kstrto*() family of functions at runtime"
@@ -2583,6 +2580,11 @@ config HW_BREAKPOINT_KUNIT_TEST
If unsure, say N. If unsure, say N.
config STRSCPY_KUNIT_TEST
tristate "Test strscpy*() family of functions at runtime" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
config TEST_UDELAY config TEST_UDELAY
tristate "udelay test driver" tristate "udelay test driver"
help help

2
lib/Makefile
View File

@@ -82,7 +82,6 @@ obj-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o
obj-$(CONFIG_TEST_PRINTF) += test_printf.o obj-$(CONFIG_TEST_PRINTF) += test_printf.o
obj-$(CONFIG_TEST_SCANF) += test_scanf.o obj-$(CONFIG_TEST_SCANF) += test_scanf.o
obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
obj-$(CONFIG_TEST_STRSCPY) += test_strscpy.o
obj-$(CONFIG_TEST_UUID) += test_uuid.o obj-$(CONFIG_TEST_UUID) += test_uuid.o
obj-$(CONFIG_TEST_XARRAY) += test_xarray.o obj-$(CONFIG_TEST_XARRAY) += test_xarray.o
obj-$(CONFIG_TEST_PARMAN) += test_parman.o obj-$(CONFIG_TEST_PARMAN) += test_parman.o
@@ -380,6 +379,7 @@ obj-$(CONFIG_OVERFLOW_KUNIT_TEST) += overflow_kunit.o
CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable) CFLAGS_stackinit_kunit.o += $(call cc-disable-warning, switch-unreachable)
obj-$(CONFIG_STACKINIT_KUNIT_TEST) += stackinit_kunit.o obj-$(CONFIG_STACKINIT_KUNIT_TEST) += stackinit_kunit.o
obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o
obj-$(CONFIG_STRSCPY_KUNIT_TEST) += strscpy_kunit.o
obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o

129
lib/strscpy_kunit.c Normal file
View File

@@ -0,0 +1,129 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Kernel module for testing 'strscpy' family of functions.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <kunit/test.h>
#include <linux/string.h>
/*
* tc() - Run a specific test case.
* @src: Source string, argument to strscpy_pad()
* @count: Size of destination buffer, argument to strscpy_pad()
* @expected: Expected return value from call to strscpy_pad()
* @terminator: 1 if there should be a terminating null byte 0 otherwise.
* @chars: Number of characters from the src string expected to be
* written to the dst buffer.
* @pad: Number of pad characters expected (in the tail of dst buffer).
* (@pad does not include the null terminator byte.)
*
* Calls strscpy_pad() and verifies the return value and state of the
* destination buffer after the call returns.
*/
static void tc(struct kunit *test, char *src, int count, int expected,
int chars, int terminator, int pad)
{
int nr_bytes_poison;
int max_expected;
int max_count;
int written;
char buf[6];
int index, i;
const char POISON = 'z';
KUNIT_ASSERT_TRUE_MSG(test, src != NULL,
"null source string not supported");
memset(buf, POISON, sizeof(buf));
/* Future proofing test suite, validate args */
max_count = sizeof(buf) - 2; /* Space for null and to verify overflow */
max_expected = count - 1; /* Space for the null */
KUNIT_ASSERT_LE_MSG(test, count, max_count,
"count (%d) is too big (%d) ... aborting", count, max_count);
KUNIT_EXPECT_LE_MSG(test, expected, max_expected,
"expected (%d) is bigger than can possibly be returned (%d)",
expected, max_expected);
written = strscpy_pad(buf, src, count);
KUNIT_ASSERT_EQ(test, written, expected);
if (count && written == -E2BIG) {
KUNIT_ASSERT_EQ_MSG(test, 0, strncmp(buf, src, count - 1),
"buffer state invalid for -E2BIG");
KUNIT_ASSERT_EQ_MSG(test, buf[count - 1], '\0',
"too big string is not null terminated correctly");
}
for (i = 0; i < chars; i++)
KUNIT_ASSERT_EQ_MSG(test, buf[i], src[i],
"buf[i]==%c != src[i]==%c", buf[i], src[i]);
if (terminator)
KUNIT_ASSERT_EQ_MSG(test, buf[count - 1], '\0',
"string is not null terminated correctly");
for (i = 0; i < pad; i++) {
index = chars + terminator + i;
KUNIT_ASSERT_EQ_MSG(test, buf[index], '\0',
"padding missing at index: %d", i);
}
nr_bytes_poison = sizeof(buf) - chars - terminator - pad;
for (i = 0; i < nr_bytes_poison; i++) {
index = sizeof(buf) - 1 - i; /* Check from the end back */
KUNIT_ASSERT_EQ_MSG(test, buf[index], POISON,
"poison value missing at index: %d", i);
}
}
static void strscpy_test(struct kunit *test)
{
/*
* tc() uses a destination buffer of size 6 and needs at
* least 2 characters spare (one for null and one to check for
* overflow). This means we should only call tc() with
* strings up to a maximum of 4 characters long and 'count'
* should not exceed 4. To test with longer strings increase
* the buffer size in tc().
*/
/* tc(test, src, count, expected, chars, terminator, pad) */
tc(test, "a", 0, -E2BIG, 0, 0, 0);
tc(test, "", 0, -E2BIG, 0, 0, 0);
tc(test, "a", 1, -E2BIG, 0, 1, 0);
tc(test, "", 1, 0, 0, 1, 0);
tc(test, "ab", 2, -E2BIG, 1, 1, 0);
tc(test, "a", 2, 1, 1, 1, 0);
tc(test, "", 2, 0, 0, 1, 1);
tc(test, "abc", 3, -E2BIG, 2, 1, 0);
tc(test, "ab", 3, 2, 2, 1, 0);
tc(test, "a", 3, 1, 1, 1, 1);
tc(test, "", 3, 0, 0, 1, 2);
tc(test, "abcd", 4, -E2BIG, 3, 1, 0);
tc(test, "abc", 4, 3, 3, 1, 0);
tc(test, "ab", 4, 2, 2, 1, 1);
tc(test, "a", 4, 1, 1, 1, 2);
tc(test, "", 4, 0, 0, 1, 3);
}
static struct kunit_case strscpy_test_cases[] = {
KUNIT_CASE(strscpy_test),
{}
};
static struct kunit_suite strscpy_test_suite = {
.name = "strscpy",
.test_cases = strscpy_test_cases,
};
kunit_test_suite(strscpy_test_suite);
MODULE_AUTHOR("Tobin C. Harding <tobin@kernel.org>");
MODULE_LICENSE("GPL");

150
lib/test_strscpy.c
View File

@@ -1,150 +0,0 @@
// SPDX-License-Identifier: GPL-2.0+
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/string.h>
#include "../tools/testing/selftests/kselftest_module.h"
/*
* Kernel module for testing 'strscpy' family of functions.
*/
KSTM_MODULE_GLOBALS();
/*
* tc() - Run a specific test case.
* @src: Source string, argument to strscpy_pad()
* @count: Size of destination buffer, argument to strscpy_pad()
* @expected: Expected return value from call to strscpy_pad()
* @terminator: 1 if there should be a terminating null byte 0 otherwise.
* @chars: Number of characters from the src string expected to be
* written to the dst buffer.
* @pad: Number of pad characters expected (in the tail of dst buffer).
* (@pad does not include the null terminator byte.)
*
* Calls strscpy_pad() and verifies the return value and state of the
* destination buffer after the call returns.
*/
static int __init tc(char *src, int count, int expected,
int chars, int terminator, int pad)
{
int nr_bytes_poison;
int max_expected;
int max_count;
int written;
char buf[6];
int index, i;
const char POISON = 'z';
total_tests++;
if (!src) {
pr_err("null source string not supported\n");
return -1;
}
memset(buf, POISON, sizeof(buf));
/* Future proofing test suite, validate args */
max_count = sizeof(buf) - 2; /* Space for null and to verify overflow */
max_expected = count - 1; /* Space for the null */
if (count > max_count) {
pr_err("count (%d) is too big (%d) ... aborting", count, max_count);
return -1;
}
if (expected > max_expected) {
pr_warn("expected (%d) is bigger than can possibly be returned (%d)",
expected, max_expected);
}
written = strscpy_pad(buf, src, count);
if ((written) != (expected)) {
pr_err("%d != %d (written, expected)\n", written, expected);
goto fail;
}
if (count && written == -E2BIG) {
if (strncmp(buf, src, count - 1) != 0) {
pr_err("buffer state invalid for -E2BIG\n");
goto fail;
}
if (buf[count - 1] != '\0') {
pr_err("too big string is not null terminated correctly\n");
goto fail;
}
}
for (i = 0; i < chars; i++) {
if (buf[i] != src[i]) {
pr_err("buf[i]==%c != src[i]==%c\n", buf[i], src[i]);
goto fail;
}
}
if (terminator) {
if (buf[count - 1] != '\0') {
pr_err("string is not null terminated correctly\n");
goto fail;
}
}
for (i = 0; i < pad; i++) {
index = chars + terminator + i;
if (buf[index] != '\0') {
pr_err("padding missing at index: %d\n", i);
goto fail;
}
}
nr_bytes_poison = sizeof(buf) - chars - terminator - pad;
for (i = 0; i < nr_bytes_poison; i++) {
index = sizeof(buf) - 1 - i; /* Check from the end back */
if (buf[index] != POISON) {
pr_err("poison value missing at index: %d\n", i);
goto fail;
}
}
return 0;
fail:
failed_tests++;
return -1;
}
static void __init selftest(void)
{
/*
* tc() uses a destination buffer of size 6 and needs at
* least 2 characters spare (one for null and one to check for
* overflow). This means we should only call tc() with
* strings up to a maximum of 4 characters long and 'count'
* should not exceed 4. To test with longer strings increase
* the buffer size in tc().
*/
/* tc(src, count, expected, chars, terminator, pad) */
KSTM_CHECK_ZERO(tc("a", 0, -E2BIG, 0, 0, 0));
KSTM_CHECK_ZERO(tc("", 0, -E2BIG, 0, 0, 0));
KSTM_CHECK_ZERO(tc("a", 1, -E2BIG, 0, 1, 0));
KSTM_CHECK_ZERO(tc("", 1, 0, 0, 1, 0));
KSTM_CHECK_ZERO(tc("ab", 2, -E2BIG, 1, 1, 0));
KSTM_CHECK_ZERO(tc("a", 2, 1, 1, 1, 0));
KSTM_CHECK_ZERO(tc("", 2, 0, 0, 1, 1));
KSTM_CHECK_ZERO(tc("abc", 3, -E2BIG, 2, 1, 0));
KSTM_CHECK_ZERO(tc("ab", 3, 2, 2, 1, 0));
KSTM_CHECK_ZERO(tc("a", 3, 1, 1, 1, 1));
KSTM_CHECK_ZERO(tc("", 3, 0, 0, 1, 2));
KSTM_CHECK_ZERO(tc("abcd", 4, -E2BIG, 3, 1, 0));
KSTM_CHECK_ZERO(tc("abc", 4, 3, 3, 1, 0));
KSTM_CHECK_ZERO(tc("ab", 4, 2, 2, 1, 1));
KSTM_CHECK_ZERO(tc("a", 4, 1, 1, 1, 2));
KSTM_CHECK_ZERO(tc("", 4, 0, 0, 1, 3));
}
KSTM_MODULE_LOADERS(test_strscpy);
MODULE_AUTHOR("Tobin C. Harding <tobin@kernel.org>");
MODULE_LICENSE("GPL");