netdev - Re: [PATCH] tc: make symbols loaded from tc action modules global.

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Message-ID: <20100802095513.1706f1e2@nehalam>
Date:	Mon, 2 Aug 2010 09:55:13 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Andreas Henriksson <andreas@...al.se>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] tc: make symbols loaded from tc action modules global.

On Mon, 2 Aug 2010 09:30:33 +0200
Andreas Henriksson <andreas@...al.se> wrote:

> Fixes problems with xtables based MARK target ("ipt" module).
> When tc loads the "ipt" (xt) module it kept the symbols local,
> this made loading of libxtables not find the required struct.
> 
> currently ipt/xt is the only tc action module.
> iproute2 never seem to do dlclose.
> hopefully the modules doesn't export more symbols then needed.
> 
> In this situation hopefully the RTLD_GLOBAL flag won't hurt us.
> 
> I've been using this patch in the Debian package of iproute for
> the last 3 weeks and noone has complained.
> ( This fixes http://bugs.debian.org/584898 )
> 
> Signed-off-by: Andreas Henriksson <andreas@...al.se>
> ---
>  tc/m_action.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/tc/m_action.c b/tc/m_action.c
> index a198158..6464b2e 100644
> --- a/tc/m_action.c
> +++ b/tc/m_action.c
> @@ -99,7 +99,7 @@ restart_s:
>  	}
>  
>  	snprintf(buf, sizeof(buf), "%s/m_%s.so", get_tc_lib(), str);
> -	dlh = dlopen(buf, RTLD_LAZY);
> +	dlh = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL);
>  	if (dlh == NULL) {
>  		dlh = aBODY;
>  		if (dlh == NULL) {


Applied
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