linux-kernel - [PATCH] [151/223] usb: misc: iowarrior: fix information leak to userland

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Message-Id: <20101212234734.823E1B27BF@basil.firstfloor.org>
Date:	Mon, 13 Dec 2010 00:47:34 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	segooon@...il.com, kees.cook@...onical.com, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [151/223] usb: misc: iowarrior: fix information leak to userland

2.6.35-longterm review patch.  If anyone has any objections, please let me 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>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux/drivers/usb/misc/iowarrior.c
===================================================================
--- linux.orig/drivers/usb/misc/iowarrior.c
+++ linux/drivers/usb/misc/iowarrior.c
@@ -552,6 +552,7 @@ 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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