linux-kernel - [patch resend] agp: info leak in agpioc_info

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Message-ID: <20140503202700.GF32753@mwanda>
Date:	Sat, 3 May 2014 23:27:00 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	David Airlie <airlied@...ux.ie>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch resend] agp: info leak in agpioc_info_wrap()

On 64 bit systems the agp_info struct has a 4 byte hole between
->agp_mode and ->aper_base.  We need to clear it to avoid disclosing
stack information to userspace.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
I sent this before on 13 Apr 2013 and a reminder on 31 May 2013 so now
I'm going to try sneak it in through the akpm tree.

diff --git a/drivers/char/agp/frontend.c b/drivers/char/agp/frontend.c
index 8121b4c..b297033 100644
--- a/drivers/char/agp/frontend.c
+++ b/drivers/char/agp/frontend.c
@@ -730,6 +730,7 @@ static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
 
 	agp_copy_info(agp_bridge, &kerninfo);
 
+	memset(&userinfo, 0, sizeof(userinfo));
 	userinfo.version.major = kerninfo.version.major;
 	userinfo.version.minor = kerninfo.version.minor;
 	userinfo.bridge_id = kerninfo.device->vendor |
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