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

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Message-Id: <D2B6D82F-AE5F-4A45-AC0C-BE5DA601FDC3@lca.pw>
Date:   Tue, 8 Oct 2019 07:42:47 -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 7:02 AM, Walter Wu <walter-zh.wu@...iatek.com> wrote:
> 
> I don't know very well in UBSAN, but I try to build ubsan kernel and
> test a negative number in memset and kmalloc_memmove_invalid_size(), it
> look like no check.

It sounds like more important to figure out why the UBSAN is not working in this case rather than duplicating functionality elsewhere.