netdev - Re: buggy check in netlink_mmap

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Message-ID: <20130719154556.GF4165@ZenIV.linux.org.uk>
Date:	Fri, 19 Jul 2013 16:45:56 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org
Subject: Re: buggy check in netlink_mmap_sendmsg()

On Fri, Jul 19, 2013 at 05:38:46PM +0200, Patrick McHardy wrote:

> >From what I can tell, the second check should catch the second case you
> describe. If the address space is shared, dup_mmap() will invoke
> netlink_mmap_ops->open

See the check for CLONE_VM in copy_mm(); we do not call dup_mm() (which would
be calling dup_mmap()) in that case.
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