linux-kernel - [PATCH] fix infoleak in devio

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Date:	Tue,  3 May 2016 16:32:16 -0400
From:	Kangjie Lu <kangjielu@...il.com>
To:	gregkh@...uxfoundation.org
Cc:	stern@...land.harvard.edu, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, taesoo@...ech.edu, insu@...ech.edu,
	Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] fix infoleak in devio

The stack object “ci” has a total size of 8 bytes. Its last 3 bytes
are padding bytes which are not initialized and leaked to userland
via “copy_to_user”.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
---
 drivers/usb/core/devio.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 52c4461..9b7f1f7 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1316,10 +1316,11 @@ static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
 
 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
 {
-	struct usbdevfs_connectinfo ci = {
-		.devnum = ps->dev->devnum,
-		.slow = ps->dev->speed == USB_SPEED_LOW
-	};
+	struct usbdevfs_connectinfo ci;
+
+	memset(&ci, 0, sizeof(ci));
+	ci.devnum = ps->dev->devnum;
+	ci.slow = ps->dev->speed == USB_SPEED_LOW;
 
 	if (copy_to_user(arg, &ci, sizeof(ci)))
 		return -EFAULT;
-- 
1.9.1