linux-kernel - Re: [RFC PATCH 08/14] af_netlink.c: make netlink

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Date:	Wed, 13 Jul 2011 02:02:23 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dhowells@...hat.com,
	ebiederm@...ssion.com,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>
Subject: Re: [RFC PATCH 08/14] af_netlink.c: make netlink_capable
 userns-aware

Quoting Eric Dumazet (eric.dumazet@...il.com):
> Le mardi 12 juillet 2011 à 23:30 +0000, Serge Hallyn a écrit :
> > From: Serge E. Hallyn <serge.hallyn@...onical.com>
> > 
> > netlink_capable should check for permissions against the user
> > namespace owning the socket in question.
> > 
> > Signed-off-by: Serge E. Hallyn <serge.hallyn@...onical.com>
> > Cc: Eric W. Biederman <ebiederm@...ssion.com>
> > ---
> >  net/netlink/af_netlink.c |   11 +++++++++--
> >  1 files changed, 9 insertions(+), 2 deletions(-)
> > 
> > diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
> > index 6ef64ad..81c1099 100644
> > --- a/net/netlink/af_netlink.c
> > +++ b/net/netlink/af_netlink.c
> > @@ -580,8 +580,15 @@ retry:
> >  
> >  static inline int netlink_capable(struct socket *sock, unsigned int flag)
> >  {
> > -	return (nl_table[sock->sk->sk_protocol].nl_nonroot & flag) ||
> > -	       capable(CAP_NET_ADMIN);
> > +	struct net *net;
> > +	if (nl_table[sock->sk->sk_protocol].nl_nonroot & flag)
> > +		return 1;
> > +#ifdef CONFIG_NET_NS
> > +	net = sock->sk->sk_net;
> > +#else
> > +	net = &init_net;
> > +#endif
> 
> This is really ugly, please use :
> 
> 	net = sock_net(sk);
> 
> And no more #ifdef

thanks, will do!
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