linux-kernel - [PATCH] [44/50] staging: comedi: fix infoleak to userspace

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Message-Id: <20110728234449.185B32403FF@tassilo.jf.intel.com>
Date:	Thu, 28 Jul 2011 16:44:49 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	segoon@...nwall.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [44/50] staging: comedi: fix infoleak to userspace

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

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

[ upstream commit 819cbb120eaec7e014e5abd029260db1ca8c5735 ]

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>
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Index: linux-2.6.35.y/drivers/staging/comedi/comedi_fops.c
===================================================================
--- linux-2.6.35.y.orig/drivers/staging/comedi/comedi_fops.c
+++ linux-2.6.35.y/drivers/staging/comedi/comedi_fops.c
@@ -383,8 +383,8 @@ 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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