mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
3bf301e1ab
Add tests to make sure the strcat() family of functions behave correctly. Signed-off-by: Kees Cook <keescook@chromium.org>
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Kernel module for testing 'strcat' family of functions.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <kunit/test.h>
|
|
#include <linux/string.h>
|
|
|
|
static volatile int unconst;
|
|
|
|
static void strcat_test(struct kunit *test)
|
|
{
|
|
char dest[8];
|
|
|
|
/* Destination is terminated. */
|
|
memset(dest, 0, sizeof(dest));
|
|
KUNIT_EXPECT_EQ(test, strlen(dest), 0);
|
|
/* Empty copy does nothing. */
|
|
KUNIT_EXPECT_TRUE(test, strcat(dest, "") == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "");
|
|
/* 4 characters copied in, stops at %NUL. */
|
|
KUNIT_EXPECT_TRUE(test, strcat(dest, "four\000123") == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "four");
|
|
KUNIT_EXPECT_EQ(test, dest[5], '\0');
|
|
/* 2 more characters copied in okay. */
|
|
KUNIT_EXPECT_TRUE(test, strcat(dest, "AB") == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "fourAB");
|
|
}
|
|
|
|
static void strncat_test(struct kunit *test)
|
|
{
|
|
char dest[8];
|
|
|
|
/* Destination is terminated. */
|
|
memset(dest, 0, sizeof(dest));
|
|
KUNIT_EXPECT_EQ(test, strlen(dest), 0);
|
|
/* Empty copy of size 0 does nothing. */
|
|
KUNIT_EXPECT_TRUE(test, strncat(dest, "", 0 + unconst) == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "");
|
|
/* Empty copy of size 1 does nothing too. */
|
|
KUNIT_EXPECT_TRUE(test, strncat(dest, "", 1 + unconst) == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "");
|
|
/* Copy of max 0 characters should do nothing. */
|
|
KUNIT_EXPECT_TRUE(test, strncat(dest, "asdf", 0 + unconst) == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "");
|
|
|
|
/* 4 characters copied in, even if max is 8. */
|
|
KUNIT_EXPECT_TRUE(test, strncat(dest, "four\000123", 8 + unconst) == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "four");
|
|
KUNIT_EXPECT_EQ(test, dest[5], '\0');
|
|
KUNIT_EXPECT_EQ(test, dest[6], '\0');
|
|
/* 2 characters copied in okay, 2 ignored. */
|
|
KUNIT_EXPECT_TRUE(test, strncat(dest, "ABCD", 2 + unconst) == dest);
|
|
KUNIT_EXPECT_STREQ(test, dest, "fourAB");
|
|
}
|
|
|
|
static void strlcat_test(struct kunit *test)
|
|
{
|
|
char dest[8] = "";
|
|
int len = sizeof(dest) + unconst;
|
|
|
|
/* Destination is terminated. */
|
|
KUNIT_EXPECT_EQ(test, strlen(dest), 0);
|
|
/* Empty copy is size 0. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "", len), 0);
|
|
KUNIT_EXPECT_STREQ(test, dest, "");
|
|
/* Size 1 should keep buffer terminated, report size of source only. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "four", 1 + unconst), 4);
|
|
KUNIT_EXPECT_STREQ(test, dest, "");
|
|
|
|
/* 4 characters copied in. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "four", len), 4);
|
|
KUNIT_EXPECT_STREQ(test, dest, "four");
|
|
/* 2 characters copied in okay, gets to 6 total. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "AB", len), 6);
|
|
KUNIT_EXPECT_STREQ(test, dest, "fourAB");
|
|
/* 2 characters ignored if max size (7) reached. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "CD", 7 + unconst), 8);
|
|
KUNIT_EXPECT_STREQ(test, dest, "fourAB");
|
|
/* 1 of 2 characters skipped, now at true max size. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "EFG", len), 9);
|
|
KUNIT_EXPECT_STREQ(test, dest, "fourABE");
|
|
/* Everything else ignored, now at full size. */
|
|
KUNIT_EXPECT_EQ(test, strlcat(dest, "1234", len), 11);
|
|
KUNIT_EXPECT_STREQ(test, dest, "fourABE");
|
|
}
|
|
|
|
static struct kunit_case strcat_test_cases[] = {
|
|
KUNIT_CASE(strcat_test),
|
|
KUNIT_CASE(strncat_test),
|
|
KUNIT_CASE(strlcat_test),
|
|
{}
|
|
};
|
|
|
|
static struct kunit_suite strcat_test_suite = {
|
|
.name = "strcat",
|
|
.test_cases = strcat_test_cases,
|
|
};
|
|
|
|
kunit_test_suite(strcat_test_suite);
|
|
|
|
MODULE_LICENSE("GPL");
|