linux-kernel - Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN

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Date:   Tue, 8 Oct 2019 05:47:30 -0400
From:   Qian Cai <cai@....pw>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        wsd_upstream <wsd_upstream@...iatek.com>
Subject: Re: [PATCH] kasan: fix the missing underflow in memmove and memcpy with CONFIG_KASAN_GENERIC=y



> On Oct 8, 2019, at 2:16 AM, Walter Wu <walter-zh.wu@...iatek.com> 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?