[28/88] packet: packet_getname_spkt: make sure string is always 0-terminated

From: Steven Rostedt
Date: Tue Aug 13 2013 - 12:05:00 EST stable review patch.
If anyone has any objections, please let me know.


From: Daniel Borkmann <dborkman@xxxxxxxxxx>

[ Upstream commit 2dc85bf323515e59e15dfa858d1472bb25cad0fe ]

uaddr->sa_data is exactly of size 14, which is hard-coded here and
passed as a size argument to strncpy(). A device name can be of size
IFNAMSIZ (== 16), meaning we might leave the destination string
unterminated. Thus, use strlcpy() and also sizeof() while we're
at it. We need to memset the data area beforehand, since strlcpy
does not padd the remaining buffer with zeroes for user space, so
that we do not possibly leak anything.

Signed-off-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
net/packet/af_packet.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 13dee6a..a10ee11 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2848,12 +2848,11 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,

uaddr->sa_family = AF_PACKET;
+ memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
if (dev)
- strncpy(uaddr->sa_data, dev->name, 14);
- else
- memset(uaddr->sa_data, 0, 14);
+ strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
*uaddr_len = sizeof(*uaddr);


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