From: Dmitry Vyukov <dvyukov@google.com>
To: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
linux-mediatek@lists.infradead.org,
wsd_upstream <wsd_upstream@mediatek.com>
Subject: Re: [PATCH 2/2] kasan: add test for invalid size in memmove
Date: Mon, 14 Oct 2019 12:41:04 +0200 [thread overview]
Message-ID: <CACT4Y+YOwMB6bguUwpcgDeaenErqG+CeuqcV-9GmB72C13Fn5A@mail.gmail.com> (raw)
In-Reply-To: <20191014103654.17982-1-walter-zh.wu@mediatek.com>
On Mon, Oct 14, 2019 at 12:37 PM Walter Wu <walter-zh.wu@mediatek.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@mediatek.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.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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> To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20191014103654.17982-1-walter-zh.wu%40mediatek.com.
next prev parent reply other threads:[~2019-10-14 10:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-14 10:36 [PATCH 2/2] kasan: add test for invalid size in memmove Walter Wu
2019-10-14 10:41 ` Dmitry Vyukov [this message]
2019-10-14 15:07 ` Matthew Wilcox
2019-10-14 15:57 ` Walter Wu
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