linux-kernel - Re: [PATCH 02/16] autofs4: switch autofs4_write to __kernel

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Date:   Fri, 1 Sep 2017 12:22:48 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>, arve@...roid.com,
        riandrews@...roid.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/16] autofs4: switch autofs4_write to __kernel_write

On Wed, Aug 30, 2017 at 04:30:26PM +0100, Al Viro wrote:
> On Wed, Aug 30, 2017 at 04:59:53PM +0200, Christoph Hellwig wrote:
> > Instead of playing games with the address limit..
> 
> I wonder...  Do we verify that it's a pipe?  If so, ->f_pos can
> (and should) be left alone...

currently nothing in autofs_dev_ioctl_setpipefd verifies that
it's a pipe.