linux-kernel - Re: [RFC PATCH] fs: allow open(dir, O

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Message-ID: <CALCETrUjbfSiPUvTzTfOVAbxy5dy3PpKnnC+h4P_+FOeibTgDw@mail.gmail.com>
Date:	Mon, 3 Nov 2014 09:06:30 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Eric Rannaud <e@...ocritical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [RFC PATCH] fs: allow open(dir, O_TMPFILE|..., 0) with mode 0

On Nov 3, 2014 12:34 AM, "Christoph Hellwig" <hch@...radead.org> wrote:
>
> On Fri, Oct 31, 2014 at 11:53:09AM -0700, Linus Torvalds wrote:
> > On Fri, Oct 31, 2014 at 11:44 AM, Andy Lutomirski <luto@...capital.net> wrote:
> > >
> > > Does the patch in this thread not fix that?
> >
> > It should. Modulo the glibc problem that makes it hard to actually set
> > the mode properly.
>
> That doesn't help because we explicitly reject O_RDONLY when combined
> with O_TMPFILE.

I think I'm missing something.  How is an O_RDONLY temporary file
useful?  Wouldn't you want an O_RDWR tempfile with mode 0400 or
something like that?

--Andy
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