tc: make symbols loaded from tc action modules global.

Submitted by Andreas Henriksson on Aug. 2, 2010, 7:30 a.m.

Details

Message ID 20100802073032.GA32046@amd64.fatal.se
State Accepted
Delegated to: stephen hemminger
Headers show

Commit Message

Andreas Henriksson Aug. 2, 2010, 7:30 a.m.
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@fatal.se>
---
 tc/m_action.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Comments

stephen hemminger Aug. 2, 2010, 4:55 p.m.
On Mon, 2 Aug 2010 09:30:33 +0200
Andreas Henriksson <andreas@fatal.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@fatal.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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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) {