linux-kernel - Re: [PATCH] Introduce O

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Message-ID: <20070531190235.GY4033@devserv.devel.redhat.com>
Date:	Thu, 31 May 2007 15:02:35 -0400
From:	Jakub Jelinek <jakub@...hat.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Ulrich Drepper <drepper@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] Introduce O_CLOEXEC (take >2)

On Thu, May 31, 2007 at 11:46:31AM -0700, Davide Libenzi wrote:
> On Thu, 31 May 2007, Ulrich Drepper wrote:
> > Davide Libenzi wrote:
> > > Isn't this better be a global process flag? Default should be, for legacy
> > > reasons,
> > 
> > No.  Policies are always wrong since it means code that cannot change
> > the policy (e.g, all runtime libraries) have no access to the
> > functionality.  I cannot set the policy to default to close-on-exit in
> > glibc all the while the application assumes this is not the case.
> 
> I was talking for a broader usage, not only glibc centric. Most ppl 
> writing MT+exec apps wants all but (eventually) and handfull of files 
> leaking across the exec boundary.

If open (and all other syscalls that create fds) have O_CLOEXEC (and
something similar for other syscalls), then such a policy can be easily
implemented on the userland, if desired.

	Jakub
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