netdev - [Patch net] team: use a larger struct for mac address

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20170720230646.30364-1-xiyou.wangcong@gmail.com>
Date:   Thu, 20 Jul 2017 16:06:46 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     andreyknvl@...gle.com, Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: [Patch net] team: use a larger struct for mac address

IPv6 tunnels use sizeof(struct in6_addr) as dev->addr_len,
but in many places especially bonding, we use struct sockaddr
to copy and set mac addr, this could lead to stack out-of-bounds
access.

Fix it by using a larger address storage like bonding.

Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Jiri Pirko <jiri@...nulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 drivers/net/team/team.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 464570409796..3c1cdd57db58 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -60,10 +60,10 @@ static struct team_port *team_port_get_rtnl(const struct net_device *dev)
 static int __set_port_dev_addr(struct net_device *port_dev,
 			       const unsigned char *dev_addr)
 {
-	struct sockaddr addr;
+	struct sockaddr_storage addr;
 
-	memcpy(addr.sa_data, dev_addr, port_dev->addr_len);
-	addr.sa_family = port_dev->type;
+	memcpy(addr.__data, dev_addr, port_dev->addr_len);
+	addr.ss_family = port_dev->type;
 	return dev_set_mac_address(port_dev, &addr);
 }
 
-- 
2.13.0