linux-kernel - Re: [PATCH 2/2] kasan: add test for invalid size in memmove

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Date:   Mon, 14 Oct 2019 12:41:04 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        wsd_upstream <wsd_upstream@...iatek.com>
Subject: Re: [PATCH 2/2] kasan: add test for invalid size in memmove

On Mon, Oct 14, 2019 at 12:37 PM Walter Wu <walter-zh.wu@...iatek.com> wrote:
>
> Test size is negative numbers in memmove in order to verify
> whether it correctly get KASAN report.
>
> Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>

Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>

Thanks!

> ---
>  lib/test_kasan.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> index 49cc4d570a40..06942cf585cc 100644
> --- a/lib/test_kasan.c
> +++ b/lib/test_kasan.c
> @@ -283,6 +283,23 @@ static noinline void __init kmalloc_oob_in_memset(void)
>         kfree(ptr);
>  }
>
> +static noinline void __init kmalloc_memmove_invalid_size(void)
> +{
> +       char *ptr;
> +       size_t size = 64;
> +
> +       pr_info("invalid size in memmove\n");
> +       ptr = kmalloc(size, GFP_KERNEL);
> +       if (!ptr) {
> +               pr_err("Allocation failed\n");
> +               return;
> +       }
> +
> +       memset((char *)ptr, 0, 64);
> +       memmove((char *)ptr, (char *)ptr + 4, -2);
> +       kfree(ptr);
> +}
> +
>  static noinline void __init kmalloc_uaf(void)
>  {
>         char *ptr;
> @@ -773,6 +790,7 @@ static int __init kmalloc_tests_init(void)
>         kmalloc_oob_memset_4();
>         kmalloc_oob_memset_8();
>         kmalloc_oob_memset_16();
> +       kmalloc_memmove_invalid_size();
>         kmalloc_uaf();
>         kmalloc_uaf_memset();
>         kmalloc_uaf2();
> --
> 2.18.0
>
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