netdev - Re: [Patch net-next 1/3] ipv4: fail early when creating netdev named all or default

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Date:	Wed, 23 Jul 2014 18:05:07 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev <netdev@...r.kernel.org>, stephane.chazelas@...il.com,
	David Miller <davem@...emloft.net>
Subject: Re: [Patch net-next 1/3] ipv4: fail early when creating netdev named
 all or default

2014-07-23 15:17 GMT-07:00 Cong Wang <xiyou.wangcong@...il.com>:
> We create a proc dir for each network device, this will cause
> conflicts when the devices have name "all" or "default".
>
> Rather than emitting an ugly kernel warning, we could just
> fail earlier by checking the device name.
>
> Reported-by: Stephane Chazelas <stephane.chazelas@...il.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---

[snip]

>
> -static void devinet_sysctl_register(struct in_device *idev)
> +static int devinet_sysctl_register(struct in_device *idev)
>  {
> -       neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
> -       __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
> +       int err;
> +
> +       if (!strcmp(idev->dev->name, "default") ||
> +           !strcmp(idev->dev->name, "all"))
> +               return -EINVAL;

Since this exact same check is done in the ipv6 counterpart, how about
moving this to a helper function like: sysctl_dev_name_is_allowed()
such that you centralize where the naming policy is enforced? In case
we need to blacklist some other interface names, there should be one
place to update.

> +
> +       err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
> +       if (err)
> +               return err;
> +       err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
>                                         &idev->cnf);
> +       if (err)
> +               neigh_sysctl_unregister(idev->arp_parms);
> +       return err;
>  }
>
>  static void devinet_sysctl_unregister(struct in_device *idev)
> --
> 1.8.3.1
>
> --
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-- 
Florian
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