ip6mr: limit IPv6 MRT_TABLE identifiers

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@oracle.com>

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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@oracle.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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> 
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On Thu, Jan 24, 2013 at 09:22:56AM +0100, walter harms wrote:
> 
> 
> 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@oracle.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) ?

Yes.

> 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 ....)

I don't understand what you are saying.

The patch is basically copy and pasted from b49d3c1e1c "net: ipmr:
limit MRT_TABLE identifiers".  RT6_TABLE_DFLT is allowed to be a
high number because in ip6mr_reg_vif() we do:

        if (mrt->id == RT6_TABLE_DFLT)
                sprintf(name, "pim6reg");
        else
                sprintf(name, "pim6reg%u", mrt->id);

regards,
dan carpenter

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From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 24 Jan 2013 09:38:34 +0300

> 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@oracle.com>

Applied, thanks Dan.
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