linux-kernel - Re: [PATCH v4 2/2] kasan: add test for invalid size in memmove

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Date:   Fri, 22 Nov 2019 01:21:17 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Walter Wu <walter-zh.wu@...iatek.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        wsd_upstream <wsd_upstream@...iatek.com>,
        linux-mediatek@...ts.infradead.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 2/2] kasan: add test for invalid size in memmove



On 11/12/19 9:53 AM, Walter Wu wrote:
> Test negative size in memmove in order to verify whether it correctly
> get KASAN report.
> 
> Casting negative numbers to size_t would indeed turn up as a large
> size_t, so it will have out-of-bounds bug and be detected by KASAN.
> 
> Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>
> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>

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