Add a simple test that checks if double-kzfree is being detected
correctly.
Link: http://lkml.kernel.org/r/20190626142014.141844-4-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mark Rutland <mark.rutland@arm.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>
kfree(bits);
}
+static noinline void __init kmalloc_double_kzfree(void)
+{
+ char *ptr;
+ size_t size = 16;
+
+ pr_info("double-free (kzfree)\n");
+ ptr = kmalloc(size, GFP_KERNEL);
+ if (!ptr) {
+ pr_err("Allocation failed\n");
+ return;
+ }
+
+ kzfree(ptr);
+ kzfree(ptr);
+}
+
static int __init kmalloc_tests_init(void)
{
/*
kasan_memcmp();
kasan_strings();
kasan_bitops();
+ kmalloc_double_kzfree();
kasan_restore_multi_shot(multishot);