linux-kernel - Re: [PATCH] usb: misc: iowarrior: fix information leak to userland

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Date:	Sat, 6 Nov 2010 10:51:55 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	Vasiliy Kulikov <segooon@...il.com>
Cc:	kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Arnd Bergmann <arnd@...db.de>,
	Oliver Neukum <oliver@...kum.org>,
	Joe Perches <joe@...ches.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: misc: iowarrior: fix information leak to userland

On Sat, Nov 06, 2010 at 05:41:31PM +0300, Vasiliy Kulikov wrote:
> Structure iowarrior_info is copied to userland with padding byted
> between "serial" and "revision" fields uninitialized.  It leads to
> leaking of contents of kernel stack memory.
> 
> Signed-off-by: Vasiliy Kulikov <segooon@...il.com>

Acked-by: Kees Cook <kees.cook@...onical.com>

> ---
>  Compile tested.
> 
>  drivers/usb/misc/iowarrior.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
> index 3756641..c9078e4 100644
> --- a/drivers/usb/misc/iowarrior.c
> +++ b/drivers/usb/misc/iowarrior.c
> @@ -553,6 +553,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
>  			/* needed for power consumption */
>  			struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
>  
> +			memset(&info, 0, sizeof(info));
>  			/* directly from the descriptor */
>  			info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
>  			info.product = dev->product_id;
> -- 
> 1.7.0.4
-- 
Kees Cook
Ubuntu Security Team
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