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// SPDX-License-Identifier: GPL-2.0
/*
* Runtime test cases for CONFIG_FORTIFY_SOURCE that aren't expected to
* Oops the kernel on success. (For those, see drivers/misc/lkdtm/fortify.c)
*
* For corner cases with UBSAN, try testing with:
*
* ./tools/testing/kunit/kunit.py run --arch=x86_64 \
* --kconfig_add CONFIG_FORTIFY_SOURCE=y \
* --kconfig_add CONFIG_UBSAN=y \
* --kconfig_add CONFIG_UBSAN_TRAP=y \
* --kconfig_add CONFIG_UBSAN_BOUNDS=y \
* --kconfig_add CONFIG_UBSAN_LOCAL_BOUNDS=y \
* --make_options LLVM=1 fortify
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <kunit/test.h>
#include <linux/string.h>
static const char array_of_10[] = "this is 10";
static const char *ptr_of_11 = "this is 11!";
static char array_unknown[] = "compiler thinks I might change";
static void known_sizes_test(struct kunit *test)
{
KUNIT_EXPECT_EQ(test, __compiletime_strlen("88888888"), 8);
KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_of_10), 10);
KUNIT_EXPECT_EQ(test, __compiletime_strlen(ptr_of_11), 11);
KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_unknown), SIZE_MAX);
/* Externally defined and dynamically sized string pointer: */
KUNIT_EXPECT_EQ(test, __compiletime_strlen(test->name), SIZE_MAX);
}
/* This is volatile so the optimizer can't perform DCE below. */
static volatile int pick;
/* Not inline to keep optimizer from figuring out which string we want. */
static noinline size_t want_minus_one(int pick)
{
const char *str;
switch (pick) {
case 1:
str = "4444";
break;
case 2:
str = "333";
break;
default:
str = "1";
break;
}
return __compiletime_strlen(str);
}
static void control_flow_split_test(struct kunit *test)
{
KUNIT_EXPECT_EQ(test, want_minus_one(pick), SIZE_MAX);
}
static struct kunit_case fortify_test_cases[] = {
KUNIT_CASE(known_sizes_test),
KUNIT_CASE(control_flow_split_test),
{}
};
static struct kunit_suite fortify_test_suite = {
.name = "fortify",
.test_cases = fortify_test_cases,
};
kunit_test_suite(fortify_test_suite);
MODULE_LICENSE("GPL");
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