[PATCH 21/21] sunrpc: exit_net cleanup check added

[PATCH 21/21] sunrpc: exit_net cleanup check added

[Vasily Averin]

Be sure that all_clients list initialized in net_init hook was return
to initial state.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
 net/sunrpc/sunrpc_syms.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index c73de18..0c5a90f 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -65,10 +65,14 @@ static __net_init int sunrpc_init_net(struct net *net)
 
 static __net_exit void sunrpc_exit_net(struct net *net)
 {
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
 	rpc_pipefs_exit_net(net);
 	unix_gid_cache_destroy(net);
 	ip_map_cache_destroy(net);
 	rpc_proc_exit(net);
+	WARN(!list_empty(&sn->all_clients),
+	     "net %p exit: sunrpc all_clients list is not empty\n", net);
 }
 
 static struct pernet_operations sunrpc_net_ops = {
-- 
2.7.4

Re: [PATCH 21/21] sunrpc: exit_net cleanup check added

[Stephen Hemminger]

On Sun, 5 Nov 2017 13:02:44 +0300
Vasily Averin <vvs-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org> wrote:

> Be sure that all_clients list initialized in net_init hook was return
> to initial state.
> 
> Signed-off-by: Vasily Averin <vvs-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org>
> ---
>  net/sunrpc/sunrpc_syms.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
> index c73de18..0c5a90f 100644
> --- a/net/sunrpc/sunrpc_syms.c
> +++ b/net/sunrpc/sunrpc_syms.c
> @@ -65,10 +65,14 @@ static __net_init int sunrpc_init_net(struct net *net)
>  
>  static __net_exit void sunrpc_exit_net(struct net *net)
>  {
> +	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
> +
>  	rpc_pipefs_exit_net(net);
>  	unix_gid_cache_destroy(net);
>  	ip_map_cache_destroy(net);
>  	rpc_proc_exit(net);
> +	WARN(!list_empty(&sn->all_clients),
> +	     "net %p exit: sunrpc all_clients list is not empty\n", net);
>  }

Don't print a kernel pointer, this is a security leak.
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Re: [PATCH 21/21] sunrpc: exit_net cleanup check added

[Stephen Hemminger]

On Sun, 5 Nov 2017 13:02:44 +0300
Vasily Averin <vvs@virtuozzo.com> wrote:

> Be sure that all_clients list initialized in net_init hook was return
> to initial state.
> 
> Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
> ---
>  net/sunrpc/sunrpc_syms.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
> index c73de18..0c5a90f 100644
> --- a/net/sunrpc/sunrpc_syms.c
> +++ b/net/sunrpc/sunrpc_syms.c
> @@ -65,10 +65,14 @@ static __net_init int sunrpc_init_net(struct net *net)
>  
>  static __net_exit void sunrpc_exit_net(struct net *net)
>  {
> +	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
> +
>  	rpc_pipefs_exit_net(net);
>  	unix_gid_cache_destroy(net);
>  	ip_map_cache_destroy(net);
>  	rpc_proc_exit(net);
> +	WARN(!list_empty(&sn->all_clients),
> +	     "net %p exit: sunrpc all_clients list is not empty\n", net);
>  }

Don't print a kernel pointer, this is a security leak.

Re: [PATCH 21/21] sunrpc: exit_net cleanup check added

[Vasily Averin]

On 2017-11-08 04:22, Stephen Hemminger wrote:
> On Sun, 5 Nov 2017 13:02:44 +0300
> Vasily Averin <vvs@virtuozzo.com> wrote:
>> +	WARN(!list_empty(&sn->all_clients),
>> +	     "net %p exit: sunrpc all_clients list is not empty\n", net);
> 
> Don't print a kernel pointer, this is a security leak.

Yes, you're right, I've submitted fixed patch in v3 already,
but seems will prepare v4 with simple  WARN_ON_ONCE(!list_empty())