netdev - Re: [PATCH net] netfilter: ipvs: make global sysctl readonly in non-init netns

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Date:   Tue, 12 Oct 2021 23:48:52 +0300 (EEST)
From:   Julian Anastasov <ja@....bg>
To:     Antoine Tenart <atenart@...nel.org>
cc:     davem@...emloft.net, kuba@...nel.org, horms@...ge.net.au,
        pablo@...filter.org, kadlec@...filter.org, fw@...len.de,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org
Subject: Re: [PATCH net] netfilter: ipvs: make global sysctl readonly in
 non-init netns


	Hello,

On Tue, 12 Oct 2021, Antoine Tenart wrote:

> Because the data pointer of net/ipv4/vs/debug_level is not updated per
> netns, it must be marked as read-only in non-init netns.
> 
> Fixes: c6d2d445d8de ("IPVS: netns, final patch enabling network name space.")
> Signed-off-by: Antoine Tenart <atenart@...nel.org>

	Looks good to me, thanks!

Acked-by: Julian Anastasov <ja@....bg>

> ---
>  net/netfilter/ipvs/ip_vs_ctl.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index c25097092a06..29ec3ef63edc 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -4090,6 +4090,11 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
>  	tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
>  	tbl[idx++].data = &ipvs->sysctl_schedule_icmp;
>  	tbl[idx++].data = &ipvs->sysctl_ignore_tunneled;
> +#ifdef CONFIG_IP_VS_DEBUG
> +	/* Global sysctls must be ro in non-init netns */
> +	if (!net_eq(net, &init_net))
> +		tbl[idx++].mode = 0444;
> +#endif
>  
>  	ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
>  	if (ipvs->sysctl_hdr == NULL) {
> -- 
> 2.31.1

Regards

--
Julian Anastasov <ja@....bg>