netdev - Re: Gaah: selinux_socket_unix_stream

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Date:	Wed, 5 Jan 2011 15:32:44 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, jeremy@...p.org, jmorris@...ei.org
Subject: Re: Gaah: selinux_socket_unix_stream_connect oops

On Wed, Jan 5, 2011 at 2:25 PM, David Miller <davem@...emloft.net> wrote:
>
> More seriously, we can get at the struct socket via sk->sk_socket in
> the SMACK code.  sk->sk_socket, unlike socket->sk, has it's state
> change to NULL (via sock_orphen()) protected by unix_state_lock(),
> which we hold for "other" in this unix connect code path.
>
> Therefore I propose we fix this like so:

Looks fine to me.

And no, I don't think that selinux is all the world, but selinux is
the _common_ case, and with the cross-pointers, the only difference
can be whether you need to dereference the pointer or not - so
choosing the "extra dereference" case for the common case seems silly.

The fact that this also fixes locking is obviously an even better
reason to do it, though ;)

                      Linus
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