linux-kernel - Re: [ 030/143] proc connector: fix info leaks

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Message-ID: <CA+rthh91-GB=PPMckeDHEco=vLOimB7fBt0nVX_C+gDz3BRngg@mail.gmail.com>
Date:	Mon, 12 May 2014 10:51:31 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	Willy Tarreau <w@....eu>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Christoph Biedl <linux-kernel.bfrz@...chmal.in-ulm.de>
Subject: Re: [ 030/143] proc connector: fix info leaks

On 12 May 2014 02:32, Willy Tarreau <w@....eu> wrote:
> 2.6.32-longterm review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Mathias Krause <minipli@...glemail.com>
>
> [ Upstream commit e727ca82e0e9616ab4844301e6bae60ca7327682 ]
>
> Initialize event_data for all possible message types to prevent leaking
> kernel stack contents to userland (up to 20 bytes). Also set the flags
> member of the connector message to 0 to prevent leaking two more stack
> bytes this way.
>
> Cc: stable@...r.kernel.org
> Signed-off-by: Mathias Krause <minipli@...glemail.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Willy Tarreau <w@....eu>
> ---
>  drivers/connector/cn_proc.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
> index 6069790..3a2587a 100644
> --- a/drivers/connector/cn_proc.c
> +++ b/drivers/connector/cn_proc.c
> [...]
>  module_init(cn_proc_init);
> +       memset(&ev->event_data, 0, sizeof(ev->event_data));
> +       msg->flags = 0; /* not used */

That last hunk looks bogus. Probably the source of Christoph's compile error.

Mathias
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