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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1570532528.4686.102.camel@mtksdccf07>
Date:   Tue, 8 Oct 2019 19:02:08 +0800
From:   Walter Wu <walter-zh.wu@...iatek.com>
To:     Qian Cai <cai@....pw>
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 Tue, 2019-10-08 at 05:47 -0400, Qian Cai wrote:
> 
> > 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?

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.