mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-29 17:25:38 +00:00
46ee8f688e
Using struct root_device to create fake devices for tests is something of a hack. The new struct kunit_device is meant for this purpose, so use it instead. Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Gow <davidgow@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
333 lines
11 KiB
C
333 lines
11 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/device.h>
|
|
#include <kunit/test.h>
|
|
#include <linux/device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/vmalloc.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);
|
|
}
|
|
|
|
#define KUNIT_EXPECT_BOS(test, p, expected, name) \
|
|
KUNIT_EXPECT_EQ_MSG(test, __builtin_object_size(p, 1), \
|
|
expected, \
|
|
"__alloc_size() not working with __bos on " name "\n")
|
|
|
|
#if !__has_builtin(__builtin_dynamic_object_size)
|
|
#define KUNIT_EXPECT_BDOS(test, p, expected, name) \
|
|
/* Silence "unused variable 'expected'" warning. */ \
|
|
KUNIT_EXPECT_EQ(test, expected, expected)
|
|
#else
|
|
#define KUNIT_EXPECT_BDOS(test, p, expected, name) \
|
|
KUNIT_EXPECT_EQ_MSG(test, __builtin_dynamic_object_size(p, 1), \
|
|
expected, \
|
|
"__alloc_size() not working with __bdos on " name "\n")
|
|
#endif
|
|
|
|
/* If the execpted size is a constant value, __bos can see it. */
|
|
#define check_const(_expected, alloc, free) do { \
|
|
size_t expected = (_expected); \
|
|
void *p = alloc; \
|
|
KUNIT_EXPECT_TRUE_MSG(test, p != NULL, #alloc " failed?!\n"); \
|
|
KUNIT_EXPECT_BOS(test, p, expected, #alloc); \
|
|
KUNIT_EXPECT_BDOS(test, p, expected, #alloc); \
|
|
free; \
|
|
} while (0)
|
|
|
|
/* If the execpted size is NOT a constant value, __bos CANNOT see it. */
|
|
#define check_dynamic(_expected, alloc, free) do { \
|
|
size_t expected = (_expected); \
|
|
void *p = alloc; \
|
|
KUNIT_EXPECT_TRUE_MSG(test, p != NULL, #alloc " failed?!\n"); \
|
|
KUNIT_EXPECT_BOS(test, p, SIZE_MAX, #alloc); \
|
|
KUNIT_EXPECT_BDOS(test, p, expected, #alloc); \
|
|
free; \
|
|
} while (0)
|
|
|
|
/* Assortment of constant-value kinda-edge cases. */
|
|
#define CONST_TEST_BODY(TEST_alloc) do { \
|
|
/* Special-case vmalloc()-family to skip 0-sized allocs. */ \
|
|
if (strcmp(#TEST_alloc, "TEST_vmalloc") != 0) \
|
|
TEST_alloc(check_const, 0, 0); \
|
|
TEST_alloc(check_const, 1, 1); \
|
|
TEST_alloc(check_const, 128, 128); \
|
|
TEST_alloc(check_const, 1023, 1023); \
|
|
TEST_alloc(check_const, 1025, 1025); \
|
|
TEST_alloc(check_const, 4096, 4096); \
|
|
TEST_alloc(check_const, 4097, 4097); \
|
|
} while (0)
|
|
|
|
static volatile size_t zero_size;
|
|
static volatile size_t unknown_size = 50;
|
|
|
|
#if !__has_builtin(__builtin_dynamic_object_size)
|
|
#define DYNAMIC_TEST_BODY(TEST_alloc) \
|
|
kunit_skip(test, "Compiler is missing __builtin_dynamic_object_size() support\n")
|
|
#else
|
|
#define DYNAMIC_TEST_BODY(TEST_alloc) do { \
|
|
size_t size = unknown_size; \
|
|
\
|
|
/* \
|
|
* Expected size is "size" in each test, before it is then \
|
|
* internally incremented in each test. Requires we disable \
|
|
* -Wunsequenced. \
|
|
*/ \
|
|
TEST_alloc(check_dynamic, size, size++); \
|
|
/* Make sure incrementing actually happened. */ \
|
|
KUNIT_EXPECT_NE(test, size, unknown_size); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define DEFINE_ALLOC_SIZE_TEST_PAIR(allocator) \
|
|
static void alloc_size_##allocator##_const_test(struct kunit *test) \
|
|
{ \
|
|
CONST_TEST_BODY(TEST_##allocator); \
|
|
} \
|
|
static void alloc_size_##allocator##_dynamic_test(struct kunit *test) \
|
|
{ \
|
|
DYNAMIC_TEST_BODY(TEST_##allocator); \
|
|
}
|
|
|
|
#define TEST_kmalloc(checker, expected_size, alloc_size) do { \
|
|
gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
|
|
void *orig; \
|
|
size_t len; \
|
|
\
|
|
checker(expected_size, kmalloc(alloc_size, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
checker(expected_size, kzalloc(alloc_size, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
kzalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
checker(expected_size, kcalloc(1, alloc_size, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, kcalloc(alloc_size, 1, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
kcalloc_node(1, alloc_size, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
kcalloc_node(alloc_size, 1, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
checker(expected_size, kmalloc_array(1, alloc_size, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, kmalloc_array(alloc_size, 1, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
kmalloc_array_node(1, alloc_size, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
kmalloc_array_node(alloc_size, 1, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
checker(expected_size, __kmalloc(alloc_size, gfp), \
|
|
kfree(p)); \
|
|
checker(expected_size, \
|
|
__kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
|
|
kfree(p)); \
|
|
\
|
|
orig = kmalloc(alloc_size, gfp); \
|
|
KUNIT_EXPECT_TRUE(test, orig != NULL); \
|
|
checker((expected_size) * 2, \
|
|
krealloc(orig, (alloc_size) * 2, gfp), \
|
|
kfree(p)); \
|
|
orig = kmalloc(alloc_size, gfp); \
|
|
KUNIT_EXPECT_TRUE(test, orig != NULL); \
|
|
checker((expected_size) * 2, \
|
|
krealloc_array(orig, 1, (alloc_size) * 2, gfp), \
|
|
kfree(p)); \
|
|
orig = kmalloc(alloc_size, gfp); \
|
|
KUNIT_EXPECT_TRUE(test, orig != NULL); \
|
|
checker((expected_size) * 2, \
|
|
krealloc_array(orig, (alloc_size) * 2, 1, gfp), \
|
|
kfree(p)); \
|
|
\
|
|
len = 11; \
|
|
/* Using memdup() with fixed size, so force unknown length. */ \
|
|
if (!__builtin_constant_p(expected_size)) \
|
|
len += zero_size; \
|
|
checker(len, kmemdup("hello there", len, gfp), kfree(p)); \
|
|
} while (0)
|
|
DEFINE_ALLOC_SIZE_TEST_PAIR(kmalloc)
|
|
|
|
/* Sizes are in pages, not bytes. */
|
|
#define TEST_vmalloc(checker, expected_pages, alloc_pages) do { \
|
|
gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
vmalloc((alloc_pages) * PAGE_SIZE), vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
vzalloc((alloc_pages) * PAGE_SIZE), vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
__vmalloc((alloc_pages) * PAGE_SIZE, gfp), vfree(p)); \
|
|
} while (0)
|
|
DEFINE_ALLOC_SIZE_TEST_PAIR(vmalloc)
|
|
|
|
/* Sizes are in pages (and open-coded for side-effects), not bytes. */
|
|
#define TEST_kvmalloc(checker, expected_pages, alloc_pages) do { \
|
|
gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
|
|
size_t prev_size; \
|
|
void *orig; \
|
|
\
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvmalloc((alloc_pages) * PAGE_SIZE, gfp), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvmalloc_node((alloc_pages) * PAGE_SIZE, gfp, NUMA_NO_NODE), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvzalloc((alloc_pages) * PAGE_SIZE, gfp), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvzalloc_node((alloc_pages) * PAGE_SIZE, gfp, NUMA_NO_NODE), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvcalloc(1, (alloc_pages) * PAGE_SIZE, gfp), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvcalloc((alloc_pages) * PAGE_SIZE, 1, gfp), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvmalloc_array(1, (alloc_pages) * PAGE_SIZE, gfp), \
|
|
vfree(p)); \
|
|
checker((expected_pages) * PAGE_SIZE, \
|
|
kvmalloc_array((alloc_pages) * PAGE_SIZE, 1, gfp), \
|
|
vfree(p)); \
|
|
\
|
|
prev_size = (expected_pages) * PAGE_SIZE; \
|
|
orig = kvmalloc(prev_size, gfp); \
|
|
KUNIT_EXPECT_TRUE(test, orig != NULL); \
|
|
checker(((expected_pages) * PAGE_SIZE) * 2, \
|
|
kvrealloc(orig, prev_size, \
|
|
((alloc_pages) * PAGE_SIZE) * 2, gfp), \
|
|
kvfree(p)); \
|
|
} while (0)
|
|
DEFINE_ALLOC_SIZE_TEST_PAIR(kvmalloc)
|
|
|
|
#define TEST_devm_kmalloc(checker, expected_size, alloc_size) do { \
|
|
gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; \
|
|
const char dev_name[] = "fortify-test"; \
|
|
struct device *dev; \
|
|
void *orig; \
|
|
size_t len; \
|
|
\
|
|
/* Create dummy device for devm_kmalloc()-family tests. */ \
|
|
dev = kunit_device_register(test, dev_name); \
|
|
KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), \
|
|
"Cannot register test device\n"); \
|
|
\
|
|
checker(expected_size, devm_kmalloc(dev, alloc_size, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
checker(expected_size, devm_kzalloc(dev, alloc_size, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
checker(expected_size, \
|
|
devm_kmalloc_array(dev, 1, alloc_size, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
checker(expected_size, \
|
|
devm_kmalloc_array(dev, alloc_size, 1, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
checker(expected_size, \
|
|
devm_kcalloc(dev, 1, alloc_size, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
checker(expected_size, \
|
|
devm_kcalloc(dev, alloc_size, 1, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
\
|
|
orig = devm_kmalloc(dev, alloc_size, gfp); \
|
|
KUNIT_EXPECT_TRUE(test, orig != NULL); \
|
|
checker((expected_size) * 2, \
|
|
devm_krealloc(dev, orig, (alloc_size) * 2, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
\
|
|
len = 4; \
|
|
/* Using memdup() with fixed size, so force unknown length. */ \
|
|
if (!__builtin_constant_p(expected_size)) \
|
|
len += zero_size; \
|
|
checker(len, devm_kmemdup(dev, "Ohai", len, gfp), \
|
|
devm_kfree(dev, p)); \
|
|
\
|
|
kunit_device_unregister(test, dev); \
|
|
} while (0)
|
|
DEFINE_ALLOC_SIZE_TEST_PAIR(devm_kmalloc)
|
|
|
|
static struct kunit_case fortify_test_cases[] = {
|
|
KUNIT_CASE(known_sizes_test),
|
|
KUNIT_CASE(control_flow_split_test),
|
|
KUNIT_CASE(alloc_size_kmalloc_const_test),
|
|
KUNIT_CASE(alloc_size_kmalloc_dynamic_test),
|
|
KUNIT_CASE(alloc_size_vmalloc_const_test),
|
|
KUNIT_CASE(alloc_size_vmalloc_dynamic_test),
|
|
KUNIT_CASE(alloc_size_kvmalloc_const_test),
|
|
KUNIT_CASE(alloc_size_kvmalloc_dynamic_test),
|
|
KUNIT_CASE(alloc_size_devm_kmalloc_const_test),
|
|
KUNIT_CASE(alloc_size_devm_kmalloc_dynamic_test),
|
|
{}
|
|
};
|
|
|
|
static struct kunit_suite fortify_test_suite = {
|
|
.name = "fortify",
|
|
.test_cases = fortify_test_cases,
|
|
};
|
|
|
|
kunit_test_suite(fortify_test_suite);
|
|
|
|
MODULE_LICENSE("GPL");
|