netdev - Re: [PATCH] netlink: add NETLINK_BROADCAST

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]

Date:	Tue, 17 Feb 2009 16:45:58 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Patrick McHardy <kaber@...sh.net>
CC:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] netlink: add NETLINK_BROADCAST_ERROR socket option

Patrick McHardy wrote:
> Pablo Neira Ayuso wrote:
>> @@ -973,7 +974,7 @@ static inline int do_one_broadcast(struct sock *sk,
>>      if (!net_eq(sock_net(sk), p->net))
>>          goto out;
>>  
>> -    if (p->failure) {
>> +    if ((nlk->flags & NETLINK_BROADCAST_SEND_ERROR) && p->failure) {
>>          netlink_overrun(sk);
>>          goto out;
>>      }
>>
>> @@ -994,13 +995,15 @@ static inline int do_one_broadcast(struct sock *sk,
>>      if (p->skb2 == NULL) {
>>          netlink_overrun(sk);
>>          /* Clone failed. Notify ALL listeners. */
>> -        p->failure = 1;
>> +        if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR)
>> +            p->failure = 1;
> 
> Almost :) If we didn't manage to clone, we can't deliver to *any*
> socket, so the check in the first chunk above is incorrect. It
> needs to always call netlink_overrun(), additionally it needs to
> set delivery_failure when the SEND_ERROR flag is present.

Hm, I'm getting lost with this :), I thought that we agreed that sockets
without the flag set should not skip.

> Something like this:
> 
>      if (p->failure) {
>  +        if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR)
>  +            p->delivery_failure = 1;

Then, I think that the previous patch that I sent should be OK
(including the flag renaming, of course), because p->delivery_failure is
set if delivery failed and p->failure is set when clone failed. In any
case, (p->failure || p->delivery_failure) results in a error report, so
this would not change anything.

-- 
"Los honestos son inadaptados sociales" -- Les Luthiers
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html