linux-kernel - Re: [PATCH v3 3/5] kasan: support alloca() poisoning

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Message-ID: <fb09a40f-1fae-ce4c-9d7c-a13c284b19e9@virtuozzo.com>
Date:   Mon, 4 Dec 2017 19:55:37 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Christoph Hellwig <hch@...radead.org>,
        Paul Lawrence <paullawrence@...gle.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kbuild@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: Re: [PATCH v3 3/5] kasan: support alloca() poisoning



On 12/04/2017 07:42 PM, Christoph Hellwig wrote:
> I don't think we are using alloca in kernel mode code, and we shouldn't.
> What do I miss?  Is this hidden support for on-stack VLAs?  I thought
> we'd get rid of them as well.
> 

Yes, this is for on-stack VLA. Last time I checked, we still had a few.