netdev - Re: [patch] ip6mr: limit IPv6 MRT

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Date:	Thu, 24 Jan 2013 09:22:56 +0100
From:	walter harms <wharms@....de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] ip6mr: limit IPv6 MRT_TABLE identifiers



Am 24.01.2013 07:38, schrieb Dan Carpenter:
> We did this for IPv4 in b49d3c1e1c "net: ipmr: limit MRT_TABLE
> identifiers" but we need to do it for IPv6 as well.  On IPv6 the name
> is "pim6reg" instead of "pimreg" so there is one less digit allowed.
> 
> The strcpy() is in ip6mr_reg_vif().
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
> index acc3249..351ce98 100644
> --- a/net/ipv6/ip6mr.c
> +++ b/net/ipv6/ip6mr.c
> @@ -1766,6 +1766,9 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
>  			return -EINVAL;
>  		if (get_user(v, (u32 __user *)optval))
>  			return -EFAULT;
> +		/* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
> +		if (v != RT_TABLE_DEFAULT && v >= 100000000)
> +			return -EINVAL;
>  		if (sk == mrt->mroute6_sk)
>  			return -EBUSY;
>  
hi Dan,
that comment left me in a bit confused, i guess you men
  printf( "pim6reg%u",v) should not exceed IFNAMSIZ (16 bytes) ?
also the if is a bit strange, i assume that RT_TABLE_DEFAULT is const
so anything else is rejected than v==RT_TABLE_DEFAULT
(assuming that RT_TABLE_DEFAULT >= 100000000 ....)

re,
 wh


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