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Date:	Sun, 09 Dec 2012 19:01:29 -0500 (EST)
From:	David Miller <>
Subject: Re: [PATCH net 1/3] inet_diag: fix oops for IPv4 AF_INET6 TCP
 SYN-RECV state

From: Neal Cardwell <>
Date: Sun,  9 Dec 2012 00:43:21 -0500

> Fix inet_diag to be aware of the fact that AF_INET6 TCP connections
> instantiated for IPv4 traffic and in the SYN-RECV state were actually
> created with inet_reqsk_alloc(), instead of inet6_reqsk_alloc(). This
> means that for such connections inet6_rsk(req) returns a pointer to a
> random spot in memory up to roughly 64KB beyond the end of the
> request_sock.
> With this bug, for a server using AF_INET6 TCP sockets and serving
> IPv4 traffic, an inet_diag user like `ss state SYN-RECV` would lead to
> inet_diag_fill_req() causing an oops or the export to user space of 16
> bytes of kernel memory as a garbage IPv6 address, depending on where
> the garbage inet6_rsk(req) pointed.
> Signed-off-by: Neal Cardwell <>

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