netdev - Re: [PATCH] net: socket: do not validate msg_namelen unless msg

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Message-ID: <1409953342.26422.137.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 05 Sep 2014 14:42:22 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Ani Sinha <ani@...sta.com>, David Miller <davem@...emloft.net>,
	"matthew.leach" <matthew.leach@....com>, netdev@...r.kernel.org,
	fenner <fenner@...sta.com>, fruggeri <fruggeri@...sta.com>,
	travisb <travisb@...sta.com>
Subject: Re: [PATCH] net: socket: do not validate msg_namelen unless
 msg_name is non-NULL

On Fri, 2014-09-05 at 23:26 +0200, Hannes Frederic Sowa wrote:

> Yes, I understood. Same issues with sin6_flowinfo where a specific
> setsockopt is needed so the kernel will look at it at all.
> 
> If you set msg_namelen = 0 if msg_name == NULL prior to the < 0 check it
> should not trigger the return -EINVAL and also we don't run into the
> unsafe implicit conversion case when comparing msg_namelen with the
> result of the sizeof(). Do you see any problems with that?

BTW, it looks some of the tests are done in different places, like
verify_iovec()

We certainly can cleanup the confusion.


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