netdev - Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

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:	Wed, 20 Oct 2010 15:24:11 -0300
From:	Leandro Lucarella <luca@...cax.com.ar>
To:	Jon Maloy <jon.maloy@...csson.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	David Miller <davem@...emloft.net>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tipc-discussion@...ts.sourceforge.net" 
	<tipc-discussion@...ts.sourceforge.net>
Subject: Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

Jon Maloy, el 20 de octubre a las 13:57 me escribiste:
> > Another option is to change the TIPC 2.0 specification to use 
> > the old format (use HBO in subscriptions and keep 
> > TIPC_SUB_SERVICE as a separate flag with value 2) and forget 
> > about all this. After all, I can't see what advantages gives 
> > having to change the BO for internal messages between the 
> > applications and the stack.
> 
> I agree with this. I have no problems with changing the draft 
> (which as Leandro already noted is "work-in-progress") to specify that 
> both HBO and NBO are permitted over the wire, and that it is the
> topology server's task to keep track of which one is used.

Just to try to understand better how things works, or are supposed to
work: do the subscription and event messages (and I mean the struct
tipc_subscr and tipc_event published in tipc.h) really go over the wire
or are only used to communicate the stack to the application inside
a node?

I think this is a crucial matter, since it defines if the changes cross
kernel/userspace boundaries only or it also crosses the kernel/network
boundaries.

> Remember, permitting both is a superset of the current one (NBO only)
> so it is fully backwards compatible. We break absolutly nothing by
> permitting this.

I think if they really go through the wire, it should be in NBO, and if
tipc_subscr and tipc_event are used only internally, we can still fix
the userspace messages when sending them through the wire.

In any case, I agree that the patches should be reverted and a solution
should be planned with more time and consensus.

Thanks.

-- 
Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
----------------------------------------------------------------------
GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145  104C 949E BFB6 5F5A 8D05)
----------------------------------------------------------------------
The world's best known word is "okay"
The second most well-known word is "Coca-Cola"
--
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