Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y

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To: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Subject: Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y
From: Qian Cai <cai@xxxxxx>
Date: Tue, 8 Oct 2019 05:47:30 -0400
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Matthias Brugger <matthias.bgg@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, linux-mediatek@xxxxxxxxxxxxxxxxxxx, wsd_upstream <wsd_upstream@xxxxxxxxxxxx>
In-reply-to: <1570515358.4686.97.camel@mtksdccf07>
References: <1570515358.4686.97.camel@mtksdccf07>


> On Oct 8, 2019, at 2:16 AM, Walter Wu <walter-zh.wu@xxxxxxxxxxxx> wrote:
> 
> It is an undefined behavior to pass a negative numbers to
>    memset()/memcpy()/memmove(), so need to be detected by KASAN.

Why can’t this be detected by UBSAN?

Follow-Ups:
- Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y
  - From: Walter Wu

References:
- Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y
  - From: Walter Wu

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