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

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Message-ID: <20171204164240.GA24425@infradead.org>
Date:   Mon, 4 Dec 2017 08:42:40 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Paul Lawrence <paullawrence@...gle.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        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

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.