linux-kernel - Re: [PATCH v2 net 2/2] net: openvswitch: allow conntrack in non-initial user namespace

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Date:   Thu, 22 Sep 2022 07:03:36 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michael Weiß <michael.weiss@...ec.fraunhofer.de>
Cc:     Paolo Abeni <pabeni@...hat.com>, Pravin B Shelar <pshelar@....org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        dev@...nvswitch.org, linux-kernel@...r.kernel.org,
        Joe Stringer <joe@...ium.io>
Subject: Re: [PATCH v2 net 2/2] net: openvswitch: allow conntrack in
 non-initial user namespace

On Wed, 21 Sep 2022 03:19:46 +0200 Michael Weiß wrote:
> Similar to the previous commit, the Netlink interface of the OVS
> conntrack module was restricted to global CAP_NET_ADMIN by using
> GENL_ADMIN_PERM. This is changed to GENL_UNS_ADMIN_PERM to support
> unprivileged containers in non-initial user namespace.

Should we bump 

  ct_limit = kmalloc(sizeof(*ct_limit), GFP_KERNEL);

to also being accounted?

Otherwise LGTM, please repost with [PATCH net-next v3] in the subject.
net is for fixes only, and we're quite late in the -rc process.

Please try to CC the original authors as well, for Joe the address
will be Joe Stringer <joe@...ium.io>.

> diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
> index 4e70df91d0f2..9142ba322991 100644
> --- a/net/openvswitch/conntrack.c
> +++ b/net/openvswitch/conntrack.c
> @@ -2252,14 +2252,16 @@ static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
>  static const struct genl_small_ops ct_limit_genl_ops[] = {
>  	{ .cmd = OVS_CT_LIMIT_CMD_SET,
>  		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
> -		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
> -					   * privilege. */
> +		.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
> +					       * privilege.
> +					       */
>  		.doit = ovs_ct_limit_cmd_set,
>  	},
>  	{ .cmd = OVS_CT_LIMIT_CMD_DEL,
>  		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
> -		.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
> -					   * privilege. */
> +		.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
> +					       * privilege.
> +					       */
>  		.doit = ovs_ct_limit_cmd_del,
>  	},
>  	{ .cmd = OVS_CT_LIMIT_CMD_GET,