linux-stable/lib/test_ubsan.c
Olof Johansson 9d7ca61b13 lib/test_ubsan.c: VLA no longer used in kernel
Since we now build with -Wvla, any use of VLA throws a warning.
Including this test, so...  maybe we should just remove the test?

  lib/test_ubsan.c: In function 'test_ubsan_vla_bound_not_positive':
  lib/test_ubsan.c:48:2: warning: ISO C90 forbids variable length array 'buf' [-Wvla]

For the out-of-bounds test, switch to non-VLA setup.

  lib/test_ubsan.c: In function 'test_ubsan_out_of_bounds':
  lib/test_ubsan.c:64:2: warning: ISO C90 forbids variable length array 'arr' [-Wvla]

Link: http://lkml.kernel.org/r/20190113183210.56154-1-olof@lixom.net
Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Jinbum Park <jinb.park7@gmail.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-03-07 18:32:00 -08:00

135 lines
2.4 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
typedef void(*test_ubsan_fp)(void);
static void test_ubsan_add_overflow(void)
{
volatile int val = INT_MAX;
val += 2;
}
static void test_ubsan_sub_overflow(void)
{
volatile int val = INT_MIN;
volatile int val2 = 2;
val -= val2;
}
static void test_ubsan_mul_overflow(void)
{
volatile int val = INT_MAX / 2;
val *= 3;
}
static void test_ubsan_negate_overflow(void)
{
volatile int val = INT_MIN;
val = -val;
}
static void test_ubsan_divrem_overflow(void)
{
volatile int val = 16;
volatile int val2 = 0;
val /= val2;
}
static void test_ubsan_shift_out_of_bounds(void)
{
volatile int val = -1;
int val2 = 10;
val2 <<= val;
}
static void test_ubsan_out_of_bounds(void)
{
volatile int i = 4, j = 5;
volatile int arr[4];
arr[j] = i;
}
static void test_ubsan_load_invalid_value(void)
{
volatile char *dst, *src;
bool val, val2, *ptr;
char c = 4;
dst = (char *)&val;
src = &c;
*dst = *src;
ptr = &val2;
val2 = val;
}
static void test_ubsan_null_ptr_deref(void)
{
volatile int *ptr = NULL;
int val;
val = *ptr;
}
static void test_ubsan_misaligned_access(void)
{
volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
volatile int *ptr, val = 6;
ptr = (int *)(arr + 1);
*ptr = val;
}
static void test_ubsan_object_size_mismatch(void)
{
/* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
volatile int val __aligned(8) = 4;
volatile long long *ptr, val2;
ptr = (long long *)&val;
val2 = *ptr;
}
static const test_ubsan_fp test_ubsan_array[] = {
test_ubsan_add_overflow,
test_ubsan_sub_overflow,
test_ubsan_mul_overflow,
test_ubsan_negate_overflow,
test_ubsan_divrem_overflow,
test_ubsan_shift_out_of_bounds,
test_ubsan_out_of_bounds,
test_ubsan_load_invalid_value,
//test_ubsan_null_ptr_deref, /* exclude it because there is a crash */
test_ubsan_misaligned_access,
test_ubsan_object_size_mismatch,
};
static int __init test_ubsan_init(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(test_ubsan_array); i++)
test_ubsan_array[i]();
(void)test_ubsan_null_ptr_deref; /* to avoid unsed-function warning */
return 0;
}
module_init(test_ubsan_init);
static void __exit test_ubsan_exit(void)
{
/* do nothing */
}
module_exit(test_ubsan_exit);
MODULE_AUTHOR("Jinbum Park <jinb.park7@gmail.com>");
MODULE_LICENSE("GPL v2");