linux-kernel - Re: [PATCH v3 1/3] kasan: Archs don't check memmove if not support it.

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Date:   Tue, 22 Oct 2019 10:09:00 +0800
From:   Nick Hu <nickhu@...estech.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>
CC:     Andrey Ryabinin <aryabinin@...tuozzo.com>, <alankao@...estech.com>,
        <palmer@...ive.com>, <aou@...s.berkeley.edu>, <glider@...gle.com>,
        <dvyukov@...gle.com>, <corbet@....net>, <alexios.zavras@...el.com>,
        <allison@...utok.net>, <Anup.Patel@....com>, <tglx@...utronix.de>,
        <gregkh@...uxfoundation.org>, <atish.patra@....com>,
        <kstewart@...uxfoundation.org>, <linux-doc@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <kasan-dev@...glegroups.com>, <linux-mm@...ck.org>
Subject: Re: [PATCH v3 1/3] kasan: Archs don't check memmove if not support
 it.

On Thu, Oct 17, 2019 at 07:58:04PM -0700, Paul Walmsley wrote:
> On Thu, 17 Oct 2019, Andrey Ryabinin wrote:
> 
> > On 10/8/19 9:11 AM, Nick Hu wrote:
> > > Skip the memmove checking for those archs who don't support it.
> >  
> > The patch is fine but the changelog sounds misleading. We don't skip memmove checking.
> > If arch don't have memmove than the C implementation from lib/string.c used.
> > It's instrumented by compiler so it's checked and we simply don't need that KASAN's memmove with
> > manual checks.
> 
> Thanks Andrey.  Nick, could you please update the patch description?
> 
> - Paul
>

Thanks! I would update the description in v4 patch.

Nick