Commit bb104ed7 authored Jul 11, 2019 by Marco Elver Committed by Linus Torvalds Jul 12, 2019

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>

parent b5f6e0fc

lib/test_kasan.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -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);

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