linux-kernel - Re: [PATCH v4 6/7] kasan: Test fix: Warn if the UAF could not be detected in kmalloc

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Message-ID: <56D47267.5070308@gmail.com>
Date:	Mon, 29 Feb 2016 19:31:35 +0300
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Alexander Potapenko <glider@...gle.com>, adech.fo@...il.com,
	cl@...ux.com, dvyukov@...gle.com, akpm@...ux-foundation.org,
	rostedt@...dmis.org, iamjoonsoo.kim@....com, js1304@...il.com,
	kcc@...gle.com
Cc:	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v4 6/7] kasan: Test fix: Warn if the UAF could not be
 detected in kmalloc_uaf2



On 02/26/2016 07:48 PM, Alexander Potapenko wrote:
> Signed-off-by: Alexander Potapenko <glider@...gle.com>
> ---
>  lib/test_kasan.c | 2 ++
>  1 file changed, 2 insertions(+)
> 

Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>

> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> index 90ad74f..82169fb 100644
> --- a/lib/test_kasan.c
> +++ b/lib/test_kasan.c
> @@ -294,6 +294,8 @@ static noinline void __init kmalloc_uaf2(void)
>  	}
>  
>  	ptr1[40] = 'x';
> +	if (ptr1 == ptr2)
> +		pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
>  	kfree(ptr2);
>  }
>  
>