netdev - Re: [RFC 7/9] snet: introduce snet_netlink.c and snet

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Date:	Wed, 13 Jan 2010 05:28:30 +0100
From:	Samir Bellabes <sam@...ack.fr>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	linux-security-module@...r.kernel.org, jamal <hadi@...erus.ca>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [RFC 7/9] snet: introduce snet_netlink.c and snet_netlink.h

Patrick McHardy <kaber@...sh.net> writes:

> Samir Bellabes wrote:
>> +++ b/security/snet/include/snet_netlink.h
>> +	SNET_A_VERSION,		/* (NLA_U32) the snet protocol version	*/
>
> You're using this to check for a "compliant protocol version" below.
> This shouldn't be needed as any protocol changes need to be done
> in a compatible fashion.

what if userspace lib is using a old protocol version ? kernel and
userspace will use incompatible protocol, which may result in errors.

The idea of this 'version' mecanism is to prevent such
incompatibilities, even if the userspace is (un)volontary not using the
good library (which may be the one tagged in the same time as the kernel
running)

sam
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