This is a note to let you know that I've just added the patch titled
packet: packet_getname_spkt: make sure string is always 0-terminated
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
packet-packet_getname_spkt-make-sure-string-is-always-0-terminated.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a2ba7bc2f5944a82f7745a0c8f5f6819d4763671 Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <[email protected]>
Date: Wed, 12 Jun 2013 16:02:27 +0200
Subject: packet: packet_getname_spkt: make sure string is always 0-terminated
From: Daniel Borkmann <[email protected]>
[ 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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/packet/af_packet.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2769,12 +2769,11 @@ static int packet_getname_spkt(struct so
return -EOPNOTSUPP;
uaddr->sa_family = AF_PACKET;
+ memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
rcu_read_lock();
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));
rcu_read_unlock();
*uaddr_len = sizeof(*uaddr);
Patches currently in stable-queue which might be from [email protected] are
queue-3.9/net-sctp-fix-null-pointer-dereference-in-socket-destruction.patch
queue-3.9/packet-packet_getname_spkt-make-sure-string-is-always-0-terminated.patch
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