linux-kernel - Re: [PATCH net-next] rtnetlink: mpls: ip_valid_fib_dump_req() requires CONFIG

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] [day] [month] [year] [list]

Date:   Tue, 9 Oct 2018 10:21:30 -0600
From:   David Ahern <dsahern@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Christian Brauner <christian@...uner.io>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] rtnetlink: mpls: ip_valid_fib_dump_req()
 requires CONFIG_INET

On 10/9/18 10:10 AM, Arnd Bergmann wrote:
> The newly added call to ip_valid_fib_dump_req() causes a link error
> in configurations that enable MPLS but not IPv4:
> 
> net/mpls/af_mpls.o: In function `mpls_dump_routes':
> af_mpls.c:(.text+0xed0): undefined reference to `ip_valid_fib_dump_req'
> 
> With the added IS_ENABLED() check we get the previous behavior
> back in that configuration, and skip the check.
> 
> Fixes: e8ba330ac0c5 ("rtnetlink: Update fib dumps for strict data checking")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  net/mpls/af_mpls.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
> index 7f891ffffc05..99ff6114d513 100644
> --- a/net/mpls/af_mpls.c
> +++ b/net/mpls/af_mpls.c
> @@ -2041,7 +2041,7 @@ static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
>  
>  	ASSERT_RTNL();
>  
> -	if (cb->strict_check) {
> +	if (IS_ENABLED(CONFIG_INET) && cb->strict_check) {
>  		int err = ip_valid_fib_dump_req(nlh, cb->extack);
>  
>  		if (err < 0)
> 

If INET is not defined then mpls will need its own valid_dump_req
function to ensure strict_check semantics are managed. I'll send a patch.