linux-kernel - [ 081/143] net: add BUG_ON if kernel advertises msg

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Date:	Mon, 12 May 2014 02:33:21 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 081/143] net: add BUG_ON if kernel advertises msg_namelen > sizeof(struct

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

------------------
 sockaddr_storage)

From: Hannes Frederic Sowa <hannes@...essinduktion.org>

[ Upstream commit 68c6beb373955da0886d8f4f5995b3922ceda4be ]

In that case it is probable that kernel code overwrote part of the
stack. So we should bail out loudly here.

The BUG_ON may be removed in future if we are sure all protocols are
conformant.

Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/socket.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/socket.c b/net/socket.c
index 2b7be6d..712f977 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -216,12 +216,13 @@ int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr,
 	int err;
 	int len;
 
+	BUG_ON(klen > sizeof(struct sockaddr_storage));
 	err = get_user(len, ulen);
 	if (err)
 		return err;
 	if (len > klen)
 		len = klen;
-	if (len < 0 || len > sizeof(struct sockaddr_storage))
+	if (len < 0)
 		return -EINVAL;
 	if (len) {
 		if (audit_sockaddr(klen, kaddr))
-- 
1.7.12.2.21.g234cd45.dirty



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