linux-kernel - Re: [PATCH 1/2] net: openvswitch: allow metering in non-initial user namespace

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Date:   Tue, 20 Sep 2022 11:43:33 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Michael Weiß 
        <michael.weiss@...ec.fraunhofer.de>
Cc:     Pravin B Shelar <pshelar@....org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        dev@...nvswitch.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net: openvswitch: allow metering in non-initial
 user namespace

On Sun, 2022-09-11 at 19:38 +0200, Michael Weiß wrote:
> The Netlink interface for metering was restricted to global CAP_NET_ADMIN
> by using GENL_ADMIN_PERM. To allow metring in a non-inital user namespace,
> e.g., a container, this is changed to GENL_UNS_ADMIN_PERM.
> 
> Signed-off-by: Michael Weiß <michael.weiss@...ec.fraunhofer.de>
> ---
>  net/openvswitch/meter.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
> index 04a060ac7fdf..e9ef050a0dd5 100644
> --- a/net/openvswitch/meter.c
> +++ b/net/openvswitch/meter.c
> @@ -687,9 +687,9 @@ static const struct genl_small_ops dp_meter_genl_ops[] = {
>  	},
>  	{ .cmd = OVS_METER_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_meter_cmd_set,
>  	},
>  	{ .cmd = OVS_METER_CMD_GET,
> @@ -699,9 +699,9 @@ static const struct genl_small_ops dp_meter_genl_ops[] = {
>  	},
>  	{ .cmd = OVS_METER_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_meter_cmd_del
>  	},
>  };

It looks like the user namespace can allocate quite a bit of memory
with multiple meters, I think it's better additionally change
GFP_KERNEL to GFP_KERNEL_ACCOUNT in dp_meter_create().

Also plese add an explicit target tree in the subj when posting the
next revision, thanks!

Paolo