linux-kernel - Re: [PATCH 0/2 RESEND] POSIX-compliant version of fchmodat with flag argument

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Message-ID: <20120918203853.GA25180@google.com>
Date:	Tue, 18 Sep 2012 13:39:38 -0700
From:	Kenny Root <kroot@...gle.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Ayer <agwa@...rewayer.name>
Subject: Re: [PATCH 0/2 RESEND] POSIX-compliant version of fchmodat with flag
 argument

On Thu, Jan 12, 2012 at 05:53:44PM -0800, Andrew Ayer wrote:
> Besides the POSIX-compliance, this patch will make it possible to
> ensure, in a race-free way, that you do not follow symlinks when
> chmodding. Previously, you could open a file with O_NOFOLLOW and fchmod
> it, but this only worked if you had read or write permissions on the
> file.  Now you can open the file with O_PATH|O_NOFOLLOW and do fchmodat
> with AT_EMPTY_PATH.

Alexander, this patch solves a particular problem in a useful way. I
find it useful and I would be happy to see it included in mainline.

Thanks,
Kenny
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