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

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Message-ID: <1366239463.2752.3.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Wed, 17 Apr 2013 23:57:43 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Patrick McHardy <kaber@...sh.net>
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, 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()?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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