linux-kernel - Re: [PATCH v2] Move stack parameters for sed_ioctl to prevent oversized stack with CONFIG

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Message-ID: <20170209071819.GA20996@infradead.org>
Date:   Wed, 8 Feb 2017 23:18:19 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Scott Bauer <scott.bauer@...el.com>
Cc:     linux-nvme@...ts.infradead.org, axboe@...com,
        keith.busch@...el.com, jonathan.derrick@...el.com,
        hch@...radead.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v2] Move stack parameters for sed_ioctl to prevent
 oversized stack with CONFIG_KASAN

I'm really not a fan of adding a global synchronization point for
no good reason.  Arnd's original patch looks fine to me, but if you
really don't want it I'd suggest to use memdup_user and just
dynamically allocate the structure.