netdev - Re: netlink recvmsg() and MSG

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Message-Id: <20070306.160557.111204912.davem@davemloft.net>
Date:	Tue, 06 Mar 2007 16:05:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	netdev@...r.kernel.org
Subject: Re: netlink recvmsg() and MSG_TRUNC

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Wed, 7 Mar 2007 11:04:19 +1100

> On Tue, Mar 06, 2007 at 04:02:02PM -0800, David Miller wrote:
> >
> > Create a lot of intefaces, try to dump them :-)
> 
> Dumps should be done using 4K (NLMSG_GOODSIZE) skb's, where is the problem?

Actually, more accurately it's using PAGE_SIZE. :)

> > GLIBC can even hit this via it's ifaddrs.c code.
> 
> Do you have a simple test case that I can run?

I see, so the better fix would be to make glibc's
netlink_request() function start with a getpagesize()'d
buffer.

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