linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <Pine.LNX.4.64.0706071534280.6445@alien.or.mcafeemobile.com>
Date:	Thu, 7 Jun 2007 15:40:14 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ulrich Drepper <drepper@...hat.com>
cc:	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Thu, 7 Jun 2007, Ulrich Drepper wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Davide Libenzi wrote:
> > What we can sanily do, is re-random the base if no fds are in there (of 
> > course CLOFORK and CLOEXEC do not count).
> 
> With the last comment you mean "count after CLOFORK and CLOEXEC", right?
>  So the re-basing would be done in two places: after fork and after execve?

Yes. Files with the CLOFORK and CLOEXEC flag do not count for fork and 
exec copies.
I was also planning on doing it in __put_unused_fd(), every time 
fmap->count goes to zero. But get_random_int() is not as cheap as I 
thought. If we use a cheaper (although less secure) function to mix pid & 
jiffies, we could do it even in there.



- Davide


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