From: Dan Carpenter <dan.carpenter@oracle.com>
To: xeb@mail.ru
Cc: "David S. Miller" <davem@davemloft.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
James Morris <jmorris@namei.org>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Patrick McHardy <kaber@trash.net>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] gre: information leak in ip6_tnl_ioctl()
Date: Thu, 16 Aug 2012 16:14:04 +0300 [thread overview]
Message-ID: <20120816131404.GA23188@elgon.mountain> (raw)
There is a one byte hole between p->hop_limit and p->flowinfo where
stack memory is leaked to the user. This was introduced in c12b395a46
"gre: Support GRE over IPv6".
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
This is only needed in linux-next.
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 33d2a0e..cb7e2de 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1312,6 +1312,8 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
}
ip6_tnl_parm_from_user(&p1, &p);
t = ip6_tnl_locate(net, &p1, 0);
+ } else {
+ memset(&p, 0, sizeof(p));
}
if (t == NULL)
t = netdev_priv(dev);
next reply other threads:[~2012-08-16 13:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 13:14 Dan Carpenter [this message]
2012-08-20 9:21 ` [patch] gre: information leak in ip6_tnl_ioctl() David Miller
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