linux-kernel - [PATCH] ipv4/ip_sockglue.c: copy msg_control optval from user to kernel space

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Message-Id: <201001151024.59482.hartleys@visionengravers.com>
Date:	Fri, 15 Jan 2010 10:24:59 -0700
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: [PATCH] ipv4/ip_sockglue.c: copy msg_control optval from user to kernel space

ipv4/ip_sockglue.c: copy msg_control optval from user to kernel space

In do_ip_getsockopt the char __user *optval is used directly in
IP_PKTOPTIONS for the msg.msg_control and not copied from
user to kernel address space. This produces a sparse warning:

warning: incorrect type in assignment (different address spaces)
   expected void *msg_control
   got char [noderef] <asn:1>*optval

Fix this by using copy _from_user to set msg.msg_control.

Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: "Pekka Savola (ipv6)" <pekkas@...core.fi>
Cc: James Morris <jmorris@...ei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Patrick McHardy <kaber@...sh.net>

---

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index cafad9b..8065456 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1173,7 +1173,8 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 		if (sk->sk_type != SOCK_STREAM)
 			return -ENOPROTOOPT;
 
-		msg.msg_control = optval;
+		if (copy_from_user(msg.msg_control, optval, len))
+			return -EFAULT;
 		msg.msg_controllen = len;
 		msg.msg_flags = 0;
 
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