linux-kernel - Re: JIT emulator needs

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Date:	Sat, 23 Jun 2007 21:14:24 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Kyle Moffett <mrmacman_g4@....com>
Cc:	Albert Cahalan <acahalan@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: JIT emulator needs

On Fri, Jun 08, 2007 at 02:35:22AM -0400, Albert Cahalan wrote:
>>> c. open() flag to unlink a file before returning the fd

On Jun 19, 2007, at 11:08:24, William Lee Irwin III wrote:
>> You probably want a tmpfile(3) -like affair which never has a  
>> pathname to begin with. It could be useful for security purposes  
>> more generally.

On Fri, Jun 22, 2007 at 11:52:12PM -0400, Kyle Moffett wrote:
> maybe this: open("/some/dir", O_TMPFILE);
> and this? open("/some/dir", O_TMPFILE|O_DIRECTORY);
> The former would return a filehandle to a new anonymous file  
> somewhere on whatever filesystem backs the specified path.  The  
> latter would do the same, except create an anonymous directory where  
> you could use "openat()" or something.  Presumably "lsof" and "/proc"  
> should show either type of handle as referring to either "/some/ 
> filesystem/" or "/some/filesystem/ (anonymous temp file)" or something.

This is plausible (and I did indeed consider the file variant),
though it may require more infrastructure than for tmpfs only.

It may be worth clarifying that I have no concrete plans to work on
the JIT emulator issues myself. I'm only disseminating ideas I think
will pass review. I expect others to take up the issue(s) perhaps with
some inspiration from what I described. I may review some, but I have
a large review backlog as things now stand.


-- wli
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