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lib/test_kasan: Add test for double-kzfree detection 

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>
This commit is contained in:
Marco Elver 2019-07-11 20:54:11 -07:00 committed by Linus Torvalds
parent b5f6e0fc7d
commit bb104ed785
1 changed files with 17 additions and 0 deletions
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17
lib/test_kasan.c
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@ -693,6 +693,22 @@ static noinline void __init kasan_bitops(void)
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)
{
/*
@ -735,6 +751,7 @@ static int __init kmalloc_tests_init(void)
kasan_memcmp();
kasan_strings();
kasan_bitops();
kmalloc_double_kzfree();
kasan_restore_multi_shot(multishot);