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

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Date:	Fri, 08 Jun 2007 06:38:20 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Davide Libenzi <davidel@...ilserver.org>
CC:	Kyle Moffett <mrmacman_g4@....com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	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

Davide Libenzi a écrit :
> On Thu, 7 Jun 2007, Eric Dumazet wrote:
>> I am afraid randomization wont really work if /sbin/init or /bin/bash for
>> example uses one (or more) unseq fd :
>> The 'random base' will be propagated at fork()/exec() time ?
> 
> As I said to Uli, we can't move the base while fds are in there. We can 
> re-randomize it when it's empty. This can also be done (it's a trivial and 
> fast operation - just set fmap->base to a new value) even every time the 
> fd count on the map touches zero.
> 

Hum, I think it would be better to free fmap if it's empty, instead of change 
fmap->base. (Only in fork() after removal of O_CLOFORK file handles, and in 
exec() after removal of O_CLOEXEC file handles)


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