Information leak in packet code:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3876
From: Vasiliy Kulikov <[email protected]>
Date: Wed, 10 Nov 2010 12:09:10 -0800
Subject: [PATCH] net: packet: fix information leak to userland

commit 67286640f638f5ad41a946b9a3dc75327950248f upstream.

packet_getname_spkt() doesn't initialize all members of sa_data field of
sockaddr struct if strlen(dev->name) < 13.  This structure is then copied
to userland.  It leads to leaking of contents of kernel stack memory.
We have to fully fill sa_data with strncpy() instead of strlcpy().

The same with packet_getname(): it doesn't initialize sll_pkttype field of
sockaddr_ll.  Set it to zero.

Signed-off-by: Vasiliy Kulikov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
[jmm: Backported to 2.6.32]
---
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1526,7 +1526,7 @@
 	uaddr->sa_family = AF_PACKET;
 	dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
 	if (dev) {
-		strlcpy(uaddr->sa_data, dev->name, 15);
+		strncpy(uaddr->sa_data, dev->name, 14);
 		dev_put(dev);
 	} else
 		memset(uaddr->sa_data, 0, 14);
@@ -1549,6 +1549,7 @@
 	sll->sll_family = AF_PACKET;
 	sll->sll_ifindex = po->ifindex;
 	sll->sll_protocol = po->num;
+	sll->sll_pkttype = 0;
 	dev = dev_get_by_index(sock_net(sk), po->ifindex);
 	if (dev) {
 		sll->sll_hatype = dev->type;
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