Re: [patch 7/8] fdmap v2 - implement sys_socket2

[Davide Libenzi <davidel@xmailserver.org>]

On Thu, 7 Jun 2007, Ulrich Drepper wrote:

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> 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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