linux-kernel - [18/50] staging: comedi: fix infoleak to userspace

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Date:	Fri, 05 Aug 2011 17:03:36 -0700
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 <segoon@...nwall.com>
Subject: [18/50] staging: comedi: fix infoleak to userspace

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

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

From: Vasiliy Kulikov <segoon@...nwall.com>

commit 819cbb120eaec7e014e5abd029260db1ca8c5735 upstream.

driver_name and board_name are pointers to strings, not buffers of size
COMEDI_NAMELEN.  Copying COMEDI_NAMELEN bytes of a string containing
less than COMEDI_NAMELEN-1 bytes would leak some unrelated bytes.

Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/comedi/comedi_fops.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -362,8 +362,8 @@ static int do_devinfo_ioctl(struct comed
 	/* fill devinfo structure */
 	devinfo.version_code = COMEDI_VERSION_CODE;
 	devinfo.n_subdevs = dev->n_subdevices;
-	memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
-	memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
+	strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
+	strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
 
 	if (read_subdev)
 		devinfo.read_subdevice = read_subdev - dev->subdevices;


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