netdev - Re: [PATCH 2/3] net: Cap number of elements for sendmmsg

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Date:	Fri, 05 Aug 2011 14:50:06 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	anton@...ba.org, acme@...hat.com, davem@...emloft.net
Cc:	netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
	eparis@...isplace.org, casey@...aufler-ca.com, mjt@....msk.ru
Subject: Re: [PATCH 2/3] net: Cap number of elements for sendmmsg

Anton Blanchard wrote:
> > Apart from the upper limit for vlen argument of sendmmsg()/recvmmsg(),
> > we need to deal with stall problem (described below).
> 
> Capping vlen at 1024 should prevent that. Your patch does a signed
> comparison which just reduces the maximum value by 1 bit doesn't it?

Just for avoiding returning IS_ERR_VALUE() value upon success.

> Keep in mind each element could have up to 1024 iovec entries at worst
> case, so I think 1024 is a sane upper max.

OK. Please take Anton's version.

Arnaldo, please consider copying this change to recvmmsg() too.
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