netdev - Re: [PATCH 08/14] netlink: implement memory mapped sendmsg()

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Message-ID: <20130418103125.GB25166@macbook.localnet>
Date:	Thu, 18 Apr 2013 12:31:25 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 08/14] netlink: implement memory mapped sendmsg()

On Wed, Apr 17, 2013 at 11:57:43PM +0100, Ben Hutchings wrote:
> On Wed, 2013-04-17 at 18:47 +0200, Patrick McHardy wrote:
> > Add support for mmap'ed sendmsg() to netlink. Since the kernel validates
> > received messages before processing them, the code makes sure userspace
> > can't modify the message contents after invoking sendmsg(). To do that
> > only a single mapping of the TX ring is allowed to exist and the socket
> > must not be shared. If either of these two conditions does not hold, it
> > falls back to copying.
> [...]
> 
> Is this resistant against copy_to_process()?

I don't know, there's no copy_to_process() function is the tree I'm using.
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