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// SPDX-License-Identifier: GPL-2.0
/*
* Test the longest symbol length. Execute with:
* ./tools/testing/kunit/kunit.py run longest-symbol
* --arch=x86_64 --kconfig_add CONFIG_KPROBES=y --kconfig_add CONFIG_MODULES=y
* --kconfig_add CONFIG_RETPOLINE=n --kconfig_add CONFIG_CFI_CLANG=n
* --kconfig_add CONFIG_MITIGATION_RETPOLINE=n
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <kunit/test.h>
#include <linux/stringify.h>
#include <linux/kprobes.h>
#include <linux/kallsyms.h>
#define DI(name) s##name##name
#define DDI(name) DI(n##name##name)
#define DDDI(name) DDI(n##name##name)
#define DDDDI(name) DDDI(n##name##name)
#define DDDDDI(name) DDDDI(n##name##name)
/*Generate a symbol whose name length is 511 */
#define LONGEST_SYM_NAME DDDDDI(g1h2i3j4k5l6m7n)
#define RETURN_LONGEST_SYM 0xAAAAA
noinline int LONGEST_SYM_NAME(void);
noinline int LONGEST_SYM_NAME(void)
{
return RETURN_LONGEST_SYM;
}
_Static_assert(sizeof(__stringify(LONGEST_SYM_NAME)) == KSYM_NAME_LEN,
"Incorrect symbol length found. Expected KSYM_NAME_LEN: "
__stringify(KSYM_NAME_LEN) ", but found: "
__stringify(sizeof(LONGEST_SYM_NAME)));
static void test_longest_symbol(struct kunit *test)
{
KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, LONGEST_SYM_NAME());
};
static void test_longest_symbol_kallsyms(struct kunit *test)
{
unsigned long (*kallsyms_lookup_name)(const char *name);
static int (*longest_sym)(void);
struct kprobe kp = {
.symbol_name = "kallsyms_lookup_name",
};
if (register_kprobe(&kp) < 0) {
pr_info("%s: kprobe not registered", __func__);
KUNIT_FAIL(test, "test_longest_symbol kallsyms: kprobe not registered\n");
return;
}
kunit_warn(test, "test_longest_symbol kallsyms: kprobe registered\n");
kallsyms_lookup_name = (unsigned long (*)(const char *name))kp.addr;
unregister_kprobe(&kp);
longest_sym =
(void *) kallsyms_lookup_name(__stringify(LONGEST_SYM_NAME));
KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, longest_sym());
};
static struct kunit_case longest_symbol_test_cases[] = {
KUNIT_CASE(test_longest_symbol),
KUNIT_CASE(test_longest_symbol_kallsyms),
{}
};
static struct kunit_suite longest_symbol_test_suite = {
.name = "longest-symbol",
.test_cases = longest_symbol_test_cases,
};
kunit_test_suite(longest_symbol_test_suite);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Test the longest symbol length");
MODULE_AUTHOR("Sergio González Collado");
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