netdev - Re: [PATCH net] mpls: fix warning with multi-label encap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4688436a-2e57-55f1-a0a6-2ba6a2fbba96@gmail.com>
Date:   Fri, 7 Jun 2019 09:49:46 -0600
From:   David Ahern <dsahern@...il.com>
To:     George Wilkie <gwilkie@...tta.att-mail.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] mpls: fix warning with multi-label encap

On 6/7/19 4:49 AM, George Wilkie wrote:
> If you configure a route with multiple labels, e.g.
>   ip route add 10.10.3.0/24 encap mpls 16/100 via 10.10.2.2 dev ens4
> A warning is logged:
>   kernel: [  130.561819] netlink: 'ip': attribute type 1 has an invalid
>   length.
> 
> This happens because mpls_iptunnel_policy has set the type of
> MPLS_IPTUNNEL_DST to fixed size NLA_U32.
> Change it to a minimum size.
> nla_get_labels() does the remaining validation.
> 
> Signed-off-by: George Wilkie <gwilkie@...tta.att-mail.com>
> ---
>  net/mpls/mpls_iptunnel.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c
> index 951b52d5835b..20c682143b01 100644
> --- a/net/mpls/mpls_iptunnel.c
> +++ b/net/mpls/mpls_iptunnel.c
> @@ -28,7 +28,7 @@
>  #include "internal.h"
>  
>  static const struct nla_policy mpls_iptunnel_policy[MPLS_IPTUNNEL_MAX + 1] = {
> -	[MPLS_IPTUNNEL_DST]	= { .type = NLA_U32 },
> +	[MPLS_IPTUNNEL_DST]	= { .len = sizeof(u32) },
>  	[MPLS_IPTUNNEL_TTL]	= { .type = NLA_U8 },
>  };
>  
> 

MPLS_IPTUNNEL_DST is an array of u32's so that looks correct

Reviewed-by: David Ahern <dsahern@...il.com>