Em Tue, Feb 21, 2017 at 02:27:40PM +0300, Andrey Ryabinin escreveu:
> DCCP doesn't purge timewait sockets on network namespace shutdown.
> So, after net namespace destroyed we could still have an active timer
> which will trigger use after free in tw_timer_handler():
>
>
> Add .exit_batch hook to dccp_v4_ops()/dccp_v6_ops() which will purge
> timewait sockets on net namespace destruction and prevent above issue.
Please add this, to help stable kernels to pick this up
Fixes: b099ce2602d8 ("net: Batch inet_twsk_purge")
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
[acme@jouet linux]$ git describe b099ce2602d8
v2.6.32-rc8-1977-gb099ce2602d8
This one added the pernet operations related to network namespaces, but
then the one above got missed.
commit 72a2d6138224298a576bcdc33d7d0004de604856
Author: Pavel Emelyanov <xemul@xxxxxxxxxx>
Date: Sun Apr 13 22:29:13 2008 -0700
[NETNS][DCCPV4]: Add dummy per-net operations.
----------------------------------
It looks ok, so please consider adding my:
Acked-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
- Arnaldo
> Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
> Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
> ---
> net/dccp/ipv4.c | 6 ++++++
> net/dccp/ipv6.c | 6 ++++++
> 2 files changed, 12 insertions(+)
>
> diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
> index d859a5c..da7cb16 100644
> --- a/net/dccp/ipv4.c
> +++ b/net/dccp/ipv4.c
> @@ -1018,9 +1018,15 @@ static void __net_exit dccp_v4_exit_net(struct net *net)
> inet_ctl_sock_destroy(net->dccp.v4_ctl_sk);
> }
>
> +static void __net_exit dccp_v4_exit_batch(struct list_head *net_exit_list)
> +{
> + inet_twsk_purge(&dccp_hashinfo, &dccp_death_row, AF_INET);
> +}
> +
> static struct pernet_operations dccp_v4_ops = {
> .init = dccp_v4_init_net,
> .exit = dccp_v4_exit_net,
> + .exit_batch = dccp_v4_exit_batch,
> };
>
> static int __init dccp_v4_init(void)
> diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
> index c4e879c..f3d8f92 100644
> --- a/net/dccp/ipv6.c
> +++ b/net/dccp/ipv6.c
> @@ -1077,9 +1077,15 @@ static void __net_exit dccp_v6_exit_net(struct net *net)
> inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
> }
>
> +static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
> +{
> + inet_twsk_purge(&dccp_hashinfo, &dccp_death_row, AF_INET6);
> +}
> +
> static struct pernet_operations dccp_v6_ops = {
> .init = dccp_v6_init_net,
> .exit = dccp_v6_exit_net,
> + .exit_batch = dccp_v6_exit_batch,
> };
>
> static int __init dccp_v6_init(void)
> --
> 2.10.2
>
> --
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