netdev - Re: [PATCH] ip: set the close-on-exec flag for descriptors

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Message-ID: <1373293036.4979.105.camel@edumazet-glaptop>
Date:	Mon, 08 Jul 2013 07:17:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Andrey Vagin <avagin@...nvz.org>, netdev@...r.kernel.org
Subject: Re: [PATCH] ip: set the close-on-exec flag for descriptors

On Tue, 2013-06-04 at 09:11 -0700, Stephen Hemminger wrote:
> On Tue,  4 Jun 2013 12:01:14 +0400
> Andrey Vagin <avagin@...nvz.org> wrote:
> 
> > Otherwise a program executed by "ip netns exec" has two extra
> > descriptors.
> > 
> > $ ip netns exec test /bin/bash
> > $ lsof -p $$
> > ...
> > bash    817 root    0u   CHR  136,0       0t0          3 /dev/pts/0
> > bash    817 root    1u   CHR  136,0       0t0          3 /dev/pts/0
> > bash    817 root    2u   CHR  136,0       0t0          3 /dev/pts/0
> > bash    817 root    3u  sock    0,6       0t0      13386 protocol: NETLINK
> > bash    817 root    4r   REG    0,3         0 4026532155 net
> > bash    817 root  255u   CHR  136,0       0t0          3 /dev/pts/0
> 
> Applied

It seems it could break ip command for old kernels, as SOCK_CLOEXEC is
supported from 2.6.27

Not sure if its worth a patch, to do the normal socket() call followed
by legacy fcntl() one.





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