linux-kernel - [17/44] usb: misc: iowarrior: fix information leak to userland

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Message-Id: <20101208000641.228540431@clark.site>
Date:	Tue, 07 Dec 2010 16:04:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Vasiliy Kulikov <segooon@...il.com>,
	Kees Cook <kees.cook@...onical.com>
Subject: [17/44] usb: misc: iowarrior: fix information leak to userland

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Vasiliy Kulikov <segooon@...il.com>

commit eca67aaeebd6e5d22b0d991af1dd0424dc703bfb upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/misc/iowarrior.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -551,6 +551,7 @@ static long iowarrior_ioctl(struct file
 			/* 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;


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