mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
06c1c49d0c
A much better "unknown size" string pointer is available directly from
struct test, so use that instead of a global that isn't shared with
modules.
Reported-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/lkml/YyCOHOchVuE/E7vS@dev-arch.thelio-3990X
Fixes: 875bfd5276 ("fortify: Add KUnit test for FORTIFY_SOURCE internals")
Cc: linux-hardening@vger.kernel.org
Build-tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
// 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");
|