linux-kernel - Re: [RFC PATCH v2 3/3] block: Always use a bounce buffer when XPFO is enabled

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Message-ID: <20160914073340.GA28090@infradead.org>
Date:   Wed, 14 Sep 2016 00:33:40 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Juerg Haefliger <juerg.haefliger@....com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-hardening@...ts.openwall.com, linux-x86_64@...r.kernel.org,
        vpk@...columbia.edu
Subject: Re: [RFC PATCH v2 3/3] block: Always use a bounce buffer when XPFO
 is enabled

On Wed, Sep 14, 2016 at 09:19:01AM +0200, Juerg Haefliger wrote:
> This is a temporary hack to prevent the use of bio_map_user_iov()
> which causes XPFO page faults.
> 
> Signed-off-by: Juerg Haefliger <juerg.haefliger@....com>

Sorry, but if your scheme doesn't support get_user_pages access to
user memory is't a steaming pile of crap and entirely unacceptable.