linux-kernel - [PATCH] usb: core: fix information leak to userland

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Date:	Sat,  6 Nov 2010 17:41:28 +0300
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Oliver Neukum <oliver@...kum.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Andi Kleen <ak@...ux.intel.com>,
	Chris Frey <cdfrey@...rsquare.net>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: core: fix information leak to userland

Structure usbdevfs_connectinfo is copied to userland with padding byted
after "slow" field uninitialized.  It leads to leaking of contents of
kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 Compile tested.

 drivers/usb/core/devio.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index f1aaff6..045bb4b 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -965,10 +965,11 @@ static int proc_getdriver(struct dev_state *ps, void __user *arg)
 
 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 {
-	struct usbdevfs_connectinfo ci;
+	struct usbdevfs_connectinfo ci = {
+		.devnum = ps->dev->devnum,
+		.slow = ps->dev->speed == USB_SPEED_LOW
+	};
 
-	ci.devnum = ps->dev->devnum;
-	ci.slow = ps->dev->speed == USB_SPEED_LOW;
 	if (copy_to_user(arg, &ci, sizeof(ci)))
 		return -EFAULT;
 	return 0;
-- 
1.7.0.4

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