From: Dan Carpenter <dan.carpenter@oracle.com>
To: David Airlie <airlied@linux.ie>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch resend] agp: info leak in agpioc_info_wrap()
Date: Sat, 3 May 2014 23:27:00 +0300 [thread overview]
Message-ID: <20140503202700.GF32753@mwanda> (raw)
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@oracle.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 |
reply other threads:[~2014-05-03 20:27 UTC|newest]
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